Arc isolation structure, contact unit, and relay

Abstract

The present disclosure relates to the technical field of power, and provides an arc isolation structure, a contact unit, and a relay. The arc isolation structure comprises a first arc isolation member, the first arc isolation member being arranged on the exterior of a static contact lead-out end, and a pair of static contact lead-out ends being in contact with or separated from a moving reed; a first step and / or a first gap are / is arranged between the first arc isolation member and the static contact lead-out end so as to obstruct arc transfer. The first step and / or the first gap may prevent an arc from transferring towards a direction in which the pair of static contact lead-out ends are close to and facing one another, preventing the occurrence of a situation that two sets of moving contacts and static contacts between the moving reed and the pair of static contact lead-out ends generate arc shorting and short-circuiting. The first step and / or the first gap may prevent an arc from transferring upwards along outer walls of the static contact lead-out ends in a direction away from the moving reed, further reducing ablation of the outer walls of the static contact lead-out ends by the arc, and improving an arc extinguishing capability and effect, so as to improve break-off capabilities between moving contacts and static contacts corresponding to the moving reed and the static contact lead-out ends.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The present disclosure claims priorities of the Chinese patent applications with application No.202322110339.4, 202310986454.X and 202310986397.5 filed on August 07, 2023, the entire contents of which are incorporated herein by reference in their entirety.TECHNICAL FIELD

[0002] The present disclosure generally relates to the field of electric power technology, in particular to an arc barrier structure, a contact unit and a relay.BACKGROUND

[0003] A relay is an electronic control device applied in automatic control circuits, which has a control system (also referred to as an input circuit) and a controlled system (also referred to as an output circuit), and is actually an "automatic switch" that controls a relatively large current with a relatively small current. Therefore, it plays roles such as automatic regulation, safety protection and circuit conversion in the circuit. As one type of relays, most existing high-voltage DC relays adopt a direct-acting structure of movable contact piece, i.e., the function of connecting and breaking loads can be achieved by the cooperation of two stationary contacts and one movable contact piece.

[0004] A principle of the interruption of the high-voltage DC relay is to generate a directional magnetic blow-out field by arranging a permanent magnet. When an arc is generated due to the separation of the movable and stationary contacts, the arc is rapidly elongated under the action of the magnetic blow-out field until the arc is extinguished, and the extinguishing of the arc can realize the breaking of the load. The most severe breaking is called as "ultimate breaking", and the load of ultimate breaking is several times the rated load. If the arc is not stable enough at the movable and stationary contacts and the arc transfers on the surfaces of the movable and stationary contacts, the arc cannot be extinguished mainly along a magnetic blow-out arc pulling path, eventually resulting in the failure to break the arc, and the product may explode and burn due to overload and overheating.

[0005] In addition, in order to meet the short-circuit resistant requirement, the existing high-voltage DC relays are usually provided with soft magnets, i.e., short-circuit resistant rings, near the internal movable and stationary contacts, to generate electro-dynamic attractive force to resist the electro-dynamic repulsive force when short-circuit current passes through. However, since the soft magnets will be magnetized near the energized conductors, they will have an attractive effect on the arc.

[0006] Due to the arrangement of the soft magnets, i.e., the short-circuit resistance rings, during the ultimate breaking of the relay, the arc is affected not only by the magnetic blow-out field but also by the magnetized soft magnets, leading to arc chaos and reducing the "ultimate breaking" capability of the high-voltage DC relay, and also causing the short-circuit ring to burn out, affecting the short-circuit resistant effect. If auxiliary contacts are arranged above the short-circuit ring, the arc may also burn out the auxiliary contacts.SUMMARY

[0007] The present disclosure provides an arc barrier structure, a contact unit and a relay, which can improve the reliability of arc breaking and feature favorable safety performance.

[0008] According to a first aspect of the present disclosure, there is provided an arc barrier structure, including: a first arc barrier disposed outside a stationary contact leading-out terminal, a pair of stationary contact leading-out terminals being configured to contact with or separate from a movable contact piece.

[0009] A first step and / or a first gap is provided between the first arc barrier and the stationary contact leading-out terminal to impede arc transfer.

[0010] In some implementations, the first arc barrier is sleeved outside the stationary contact leading-out terminal.

[0011] In some implementations, a stationary contact is provided at a bottom of the stationary contact leading-out terminal, and an outer peripheral wall of the first arc barrier protrudes beyond an outer peripheral wall of the stationary contact.

[0012] The stationary contact leading-out terminal and the stationary contact are integrally or separately formed.

[0013] In some implementations, an outer wall of the first arc barrier protrudes beyond an outer peripheral wall of the stationary contact leading-out terminal, and the first step is formed between a bottom wall at one end of the first arc barrier facing the movable contact piece and an outer peripheral wall of a corresponding stationary contact leading-out terminal.

[0014] In some implementations, the first gap is provided between an inner wall at the bottom of one end of the first arc barrier facing the movable contact piece and an outer wall of the stationary contact leading-out terminal.

[0015] In some implementations, one end of the first gap facing the movable contact piece is provided with an open end, and one end of the first gap away from the movable contact piece is a closed end.

[0016] In some implementations, the first gap is provided between an inner peripheral wall at the bottom of the first arc barrier and an outer peripheral wall at the bottom of the stationary contact leading-out terminal.

[0017] In some implementations, one of an inner wall of the first arc barrier and an outer wall of the stationary contact leading-out terminal is provided with a positioning part, and the other of the inner wall of the first arc barrier and the outer wall of the stationary contact leading-out terminal is provided with a fitting part, and the positioning part is engaged with the fitting part.

[0018] In some implementations, the first arc barrier is made of an insulating material.

[0019] In some implementations, a first guiding gap is provided between an inner wall at a top of one end of the first arc barrier away from the movable contact piece and an outer wall of the corresponding stationary contact leading-out terminal, and the first guiding gap is configured to guide the stationary contact leading-out terminal.

[0020] According to a second aspect of the present disclosure, a contact unit of the present disclosure includes a movable contact piece, a pair of stationary contact leading-out terminals, and the arc barrier structure, wherein the movable contact piece is configured to contact with or separate from the pair of stationary contact leading-out terminals, the first arc barrier of the arc barrier structure is disposed outside the stationary contact leading-out terminal, and the arc barrier structure is configured to impede arc transfer.

[0021] In some implementations, a portion where the movable contact piece is in contact with the pair of stationary contact leading-out terminals is a first contact part, and at least part of the first step and / or the first gap is disposed between inner edges of the first contact parts.

[0022] In some implementations, one surface of the movable contact piece facing the stationary contact leading-out terminal is a top surface of the movable contact piece, an arc barrier portion is provided on the top surface of the movable contact piece, and the arc barrier portion is configured to impede movement of an arc toward a direction in which the pair of stationary contact leading-out terminals face each other.

[0023] In some implementations, the arc barrier portion is a first arc barrier groove; and / or, the arc barrier portion is an arc barrier rib.

[0024] In some implementations, a portion where the movable contact piece is in contact with the pair of stationary contact leading-out terminals is a first contact part, and the arc barrier portion is disposed between inner edges of the two first contact parts.

[0025] In some implementations, the contact unit further includes an insulating cover, wherein the movable contact piece is movably disposed within the insulating cover, and the stationary contact leading-out terminal is inserted into the insulating cover and is at least partially disposed within the insulating cover.

[0026] In some implementations, the first arc barrier is disposed outside a portion of the stationary contact leading-out terminal located within the insulating cover.

[0027] In some implementations, there is also provided an anti-short circuit assembly. The short-circuit resistance assembly is provided at least at a side of the movable contact piece facing the stationary contact leading-out terminal, and is configured to generate an attractive force upon occurrence of a high fault current in the movable contact piece to resist an electro-dynamic repulsive force between the movable contact piece and the stationary contact leading-out terminal.

[0028] According to a third aspect of the present disclosure, a relay of the present disclosure includes the above contact unit.

[0029] One embodiment of the present disclosure has following advantages or beneficial effects:

[0030] In the arc barrier structure provided by the embodiment of the present disclosure, the first step and / or the first gap is provided at a position where the first arc barrier is in contact with the stationary contact leading-out terminal and on a moving path of the arc, that is, a bend is formed on the arc path, which can consume kinetic energy of the arc and better block the arc transfer. The arc has two transfer directions: first, the first step and / or the first gap can block the arc from transferring toward the direction in which the pair of stationary contact leading-out terminals face each other, to avoid the occurrence of arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece and the pair of stationary contact leading-out terminals; second, the first step and / or the first gap can block the arc from transferring upward along the outer wall of the stationary contact leading-out terminal toward the direction away from the movable contact piece, further reduce the ablation of the outer wall of the stationary contact leading-out terminal by the arc, improve the arc extinguishing capability and effect, and thus improve the interruption capability between the movable contact and the stationary contact corresponding to the movable contact piece and the stationary contact leading-out terminal.

[0031] The present disclosure provides a contact unit and a relay. The movable contact piece of the contact unit is configured to contact with or separate from the pair of stationary contact leading-out terminals. When the movable contact piece is in contact with the stationary contacts at the bottom of the pair of stationary contact leading-out terminals, current flows in from one stationary contact leading-out terminal, passes through the movable contact piece and then flows out of the other stationary contact leading-out terminal, thereby realizing load connection. When the arc moves up and down along the outer wall of the stationary contact leading-out terminal under the action of the magnetic field, the arc barrier structure is disposed outside the stationary contact leading-out terminal, and under the action of the arc barrier structure, a risk of arc ablation on the peripheral side wall of the stationary contact leading-out terminal can be reduced.

[0032] The above and other objectives, features and advantages of the present disclosure will become more apparent from the following description of the preferred embodiments with reference to the accompanying drawings.BRIEF DESCRIPTION OF THE DRAWINGS

[0033] For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the accompanying drawings below. Components in the accompanying drawings are not necessarily drawn to scale, and relevant elements may be omitted to emphasize and clearly illustrate the technical features of the present disclosure. In addition, relevant elements or components may be arranged differently as known in the art. Furthermore, in the accompanying drawings, the same reference numerals denote the same or similar components throughout the various drawings. The above and other features and advantages of the present disclosure will become more apparent by describing the exemplary embodiments thereof in detail with reference to the accompanying drawings. FIG. 1 is a first schematic structural view of a relay provided in a first embodiment of the present disclosure; FIG. 2 is a sectional view taken along line A1-A1 of FIG. 1; FIG. 3 is a first schematic view of cooperation of a stationary contact leading-out terminal and a first arc barrier in the relay provided in the first embodiment of the present disclosure; FIG. 4 is a second schematic view of the cooperation of the stationary contact leading-out terminal and the first arc barrier in the relay provided in the first embodiment of the present disclosure; FIG. 5 is a sectional view taken along line C1-C1 of FIG. 4; FIG. 6 is an enlarged partial view of part B0 in FIG. 2; FIG. 7 is a first schematic structural view of a movable contact piece in the relay provided in the first embodiment of the present disclosure; FIG. 8 is a second schematic structural view of a movable contact piece in the relay provided in the first embodiment of the present disclosure; FIG. 9 is a first exploded schematic view of the relay provided in the first embodiment of the present disclosure; FIG. 10 is a second schematic structural view of the relay provided in the first embodiment of the present disclosure; FIG. 11 is a second exploded schematic view of the relay provided in the first embodiment of the present disclosure; FIG. 12 is a schematic structural view of a contact container in the relay provided in the first embodiment of the present disclosure; FIG. 13 is a schematic structural view of a push rod unit in the relay provided in the first embodiment of the present disclosure; FIG. 14 is a first schematic structural view of a movable contact piece in a relay provided in a second embodiment of the present disclosure; FIG. 15 is a second schematic structural view of the movable contact piece in the relay provided in the second embodiment of the present disclosure; FIG. 16 is a third schematic structural view of the movable contact piece in the relay provided in the second embodiment of the present disclosure; FIG. 17 is a fourth schematic structural view of a movable contact piece in the relay provided in the second embodiment of the present disclosure; FIG. 18 is a fifth schematic structural view of the movable contact piece in the relay provided in the second embodiment of the present disclosure; FIG. 19 is a sixth schematic structural view of the movable contact piece in the relay provided in the second embodiment of the present disclosure; FIG. 20 is a first schematic structural view of the movable contact piece in a relay provided in a third embodiment of the present disclosure; FIG. 21 is a second schematic structural view of the movable contact piece in the relay provided in the third embodiment of the present disclosure. FIG. 22 is a first schematic structural view of a relay provided in a fourth embodiment of the present disclosure; FIG. 23 is a sectional view taken along line A2-A2 of FIG. 22; FIG. 24 is a first exploded schematic view of the relay provided in the fourth embodiment of the present disclosure; FIG. 25 is a first schematic view of the cooperation of a movable contact piece and a first arc barrier in the relay provided in the fourth embodiment of the present disclosure; FIG. 26 is a second schematic view of the cooperation of the movable contact piece and the first arc barrier in the relay provided in the fourth embodiment of the present disclosure; FIG. 27 is a sectional view taken along part B1-B1 of FIG. 26; FIG. 28 is an enlarged partial view of part B2 in FIG. 26; FIG. 29 is a third schematic view of the cooperation of the movable contact piece and the first arc barrier in the relay provided in the fourth embodiment of the present disclosure; FIG. 30 is a sectional view taken along part B3-B3 of FIG. 29; FIG. 31 is an enlarged partial view of part B4 of FIG. 29; FIG. 32 is a second exploded schematic view of the relay provided in the fourth embodiment of the present disclosure; FIG. 33 is a first schematic structural view of the movable contact piece in the relay provided in the fourth embodiment of the present disclosure; FIG. 34 is a second exploded schematic view of the movable contact piece in the relay provided in the fourth embodiment of the present disclosure; FIG. 35 is a second schematic structural view of the relay provided in the fourth embodiment of the present disclosure; FIG. 36 is a schematic structural view of a contact container in the relay provided in the fourth embodiment of the present disclosure; FIG. 37 is a schematic structural view of a push rod unit in the relay provided in the fourth embodiment of the present disclosure; FIG. 38 is a first schematic structural view of a movable contact piece in a relay provided in a fifth embodiment of the present disclosure; FIG. 39 is a second schematic structural view of the movable contact piece in the relay provided in the fifth embodiment of the present disclosure; FIG. 40 is a third schematic structural view of the movable contact piece in the relay provided in the fifth embodiment of the present disclosure; FIG. 41 is a fourth schematic structural view of a movable contact piece in the relay provided in the fifth embodiment of the present disclosure; FIG. 42 is a fifth schematic structural view of the movable contact piece in the relay provided in the fifth embodiment of the present disclosure; FIG. 43 is a sixth schematic structural view of the movable contact piece in the relay provided in the fifth embodiment of the present disclosure; FIG. 44 is a first schematic structural view of the movable contact piece in a relay provided in a sixth embodiment of the present disclosure; FIG. 45 is a second schematic structural view of the movable contact piece in the relay provided in the sixth embodiment of the present disclosure. FIG. 46 is a first schematic structural view of a relay provided in a seventh embodiment of the present disclosure; FIG. 47 is a sectional view taken along line A3-A3 of FIG. 46; FIG. 48 is a first exploded schematic view of the relay provided in the seventh embodiment of the present disclosure; FIG. 49 is a first schematic view of cooperation of a stationary contact leading-out terminal and a first arc barrier in the relay provided in the seventh embodiment of the present disclosure; FIG. 50 is a second schematic view of the cooperation of the stationary contact leading-out terminal and the first arc barrier in the relay provided in the seventh embodiment of the present disclosure; FIG. 51 is a sectional view taken along part C2-C2 of FIG. 50; FIG. 52 is an enlarged partial view of the first arc barrier as shown in FIG. 47; FIG. 53 is a first schematic view of the cooperation of the movable contact piece and the second arc barrier in the relay provided in the seventh embodiment of the present disclosure; FIG. 54 is a second schematic view of the cooperation of the movable contact piece and the second arc barrier in the relay provided in the seventh embodiment of the present disclosure; FIG. 55 is a sectional view at part B5-B5 in FIG. 54; FIG. 56 is an enlarged partial view at part B6 of FIG. 54; FIG. 57 is a third schematic view of the cooperation of the movable contact piece and the second arc barrier in the relay provided in the seventh embodiment of the present disclosure; FIG. 58 is a sectional view at part B7-B7 in FIG. 57; FIG. 59 is an enlarged partial view at part B8 of FIG. 57; FIG. 60 is a second exploded schematic view of the relay provided in the seventh embodiment of the present disclosure; FIG. 61 is a first exploded schematic view of the movable contact piece in the relay provided in the seventh embodiment of the present disclosure; FIG. 62 is a second schematic structural view of the movable contact piece in the relay provided in the seventh embodiment of the present disclosure; FIG. 63 is a schematic structural view of the relay provided in the seventh embodiment of the present disclosure; FIG. 64 is a schematic structural view of a contact container in the relay provided in the seventh embodiment of the present disclosure; FIG. 65 is a first schematic structural view of a movable contact piece in a relay provided in an eighth embodiment of the present disclosure; FIG. 66 is a second schematic structural view of the movable contact piece in the relay provided in the eighth embodiment of the present disclosure; FIG. 67 is a third schematic structural view of the movable contact piece in the relay provided in the eighth embodiment of the present disclosure; FIG. 68 is a fourth schematic structural view of a movable contact piece in the relay provided in the eighth embodiment of the present disclosure; FIG. 69 is a fifth schematic structural view of the movable contact piece in the relay provided in the eighth embodiment of the present disclosure; FIG. 70 is a sixth schematic structural view of the movable contact piece in the relay provided in the eighth embodiment of the present disclosure; FIG. 71 is a first schematic structural view of the movable contact piece in a relay provided in a third embodiment of the present disclosure; FIG. 72 is a second schematic structural view of the movable contact piece in the relay provided in the third embodiment of the present disclosure. The reference numerals are as follows: 1. contact container; 2. contact assembly; 4. push assembly; 5. arc extinguishing unit; 6, 7. first arc barrier; 8. second arc barrier; 11. insulating cover; 111. through hole; 12. frame piece; 21. stationary contact leading-out terminal; 211. fitting part; 22. movable contact piece; 221. thrust part; 2211. through hole; 220. first contact part; 222. first arc barrier groove; 223. mounting groove; 2231. first mounting portion; 2232. fixing portion; 2233. second mounting portion; 225. arc barrier rib; 31. upper magnetic conductor; 32. lower magnetic conductor; 41. push rod unit; 411. push rod; 412. limiting protrusion; 413. base; 42. U-shaped bracket; 421. limiting hole; 43. elastic member; 44. electromagnet unit; 441. coil bobbin; 442. coil; 443. movable core; 444. stationary core; 445. U-shaped yoke; 446. magnetic sleeve; 447. spring; 51. arc extinguishing magnet; 52. yoke clamp; 60, 72. first gap; 61, 71. first step; 62. positioning part; 63, 73. first guiding gap; 70. column; 74. limiting part; 75. arc barrier ring; 76. connecting part; 81. second step; 82. second gap; 83. second guiding gap. DETAILED DESCRIPTION

[0034] The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below in connection with the accompanying drawings in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are for illustrative purposes only, and are not intended to limit the protection scope of the present disclosure. Therefore, it should be understood that various modifications and changes may be made to the exemplary embodiments without departing from the protection scope of the present disclosure.

[0035] In the description of the present disclosure, unless otherwise explicitly specified and limited, the terms "first" and "second" are used for descriptive purposes only, and shall not be construed as indicating or implying relative importance; the term "a plurality of" refers to two or more; the term "and / or" includes any combination and all combinations of one or more of the associated listed items. In particular, reference to "the" object or "a" object is also intended to mean one of a possible plurality of such objects.

[0036] Unless otherwise specified or stated, the terms "connect", "fix" and the like shall be understood in a broad sense. For example, "connection" may be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" may be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0037] Furthermore, in the description of the present disclosure, it should be understood that directional terms such as "upper", "lower", "inner" and "outer" described in the exemplary embodiments of the present disclosure are described from angles shown in the accompanying drawings, and shall not be construed as limiting the exemplary embodiments of the present disclosure. It should also be understood that in the context, when an element or feature is mentioned to be connected "on", "under", "inside" or "outside" another element (one or more), it can be directly connected "on", "under", "inside" or "outside" the other element (one or more), or indirectly connected "on", "under", "inside" or "outside" the other element (one or more) through an intermediate element.

[0038] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, exemplary embodiments can be implemented in various forms, and shall not be construed as limiting the embodiments set forth herein; on the contrary, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the figures denote the same or similar structures, and thus their detailed descriptions will be omitted.First Embodiment

[0039] The present embodiment provides a contact unit. As shown in FIGS. 1-2, the contact unit includes a movable contact piece 22 and a pair of stationary contact leading-out terminals 21. The movable contact piece 22 is configured to contact with or separate from the pair of stationary contact leading-out terminals 21.

[0040] In the contact unit provided by the present embodiment, the movable contact piece 22 is contacted with or separated from the pair of stationary contact leading-out terminals 21. When the movable contact piece 22 comes into contact with stationary contacts at the bottom of the pair of stationary contact leading-out terminals 21, current flows in from one stationary contact leading-out terminal 21, passes through the movable contact piece 22 and then flows out of the other stationary contact leading-out terminal 21, thereby connecting a load.

[0041] In one embodiment, the stationary contact is provided at the bottom of the stationary contact leading-out terminal 21. The stationary contact leading-out terminal 21 and the stationary contact are integrally or separately formed.

[0042] Specifically, the bottom of the stationary contact leading-out terminal 21 can directly serve as the stationary contact, or the stationary contact can be disposed at the bottom of the stationary contact leading-out terminal 21 integrally or separately.

[0043] When the movable contact piece 22 is separated from the stationary contacts at the bottom of the pair of stationary contact leading-out terminals 21, along with the separation of the movable and stationary contacts between the movable contact piece 22 and the stationary contact leading-out terminals 21 and a magnetic blow arc-pulling, if the arc is pulled to a certain extent, the arc will be extinguished automatically; if the arc is not stable enough at the movable and stationary contacts and transfers on the surface of the movable contact piece 22 or the stationary contact leading-out terminal 21, the arc cannot be extinguished mainly along the magnetic blow-out arc pulling path, eventually resulting in failure to break the arc and even explosion and burnout of the relay.

[0044] In order to solve this problem, as shown in FIGS. 2-5, the contact unit provided by the present embodiment further includes an arc barrier structure, which is disposed outside the stationary contact leading-out terminal 21 and configured to impede arc transfer.

[0045] The arc barrier structure is disposed outside the stationary contact leading-out terminal. When the arc moves up and down along the outer wall of the stationary contact leading-out terminal 21 under the action of the magnetic field, and under the action of the arc barrier structure, a risk of arc ablation on the side wall of the stationary contact leading-out terminal 21 may be reduced.

[0046] Specifically, as shown in FIGS. 5-6, the arc barrier structure provided by the present embodiment includes a first arc barrier 6, which is disposed outside the stationary contact leading-out terminal 21. A first step 61 and / or a first gap 60 is provided between the first arc barrier 6 and the stationary contact leading-out terminal 21, to impede arc transfer.

[0047] In the arc barrier structure provided by the present embodiment, the first step 61 and / or the first gap 60 is provided at a position where the first arc barrier 6 is in contact with the stationary contact leading-out terminal 21 and on a moving path of the arc, that is, a bend is formed on the arc path, which can consume the kinetic energy of the arc and better block the arc transfer. The arc has two transfer directions: first, the first step 61 and the first gap 60 can block the arc from transferring toward the direction in which the pair of stationary contact leading-out terminals 21 face each other, to avoid the occurrence of arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21; second, the first step 61 and the first gap 60 can block the arc from transferring upward along the outer wall of the stationary contact leading-out terminal 21 toward a direction away from the movable contact piece 22, further reduce the ablation of the outer wall of the stationary contact leading-out terminal 21 by the arc, improve the arc extinguishing capability and effect, and thus improve the interruption capability between the movable contact and the stationary contact corresponding to the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0048] In one embodiment, the first arc barrier 6 is made of an insulating material.

[0049] Specifically, the first arc barrier 6 may be made of insulating materials such as ceramics, glass, rubber or plastic. The first arc barrier 6 made of insulating material has good arc extinguishing or arc cooling performance, with strong arc extinguishing capability and favorable arc extinguishing effect.

[0050] It can be understood that in some other embodiments, the first arc barrier 6 may also be made of metal materials.

[0051] In one embodiment, the first arc barrier 6 is sleeved outside the stationary contact leading-out terminal 21.

[0052] The first arc barrier 6 may also be an arc barrier sleeve. The first arc barrier 6 is sleeved outside the stationary contact leading-out terminal 21 to perform arc isolation treatment on the outer peripheral side of the contact area corresponding to the stationary contact of the stationary contact leading-out terminal 21, which can achieve more comprehensive arc isolation, and is conducive to arc extinguishing.

[0053] It should be particularly noted that the first arc barrier 6 is sleeved on the stationary contact leading-out terminal 21, and the first arc barrier 6 includes but is not limited to cylindrical, elliptical cylindrical, square cylindrical, polygonal cylindrical and other shapes.

[0054] In one embodiment, the first arc barrier 6 is a closed ring structure arranged around the stationary contact leading-out terminal 21; or, the first arc barrier 6 is distributed in an annular shape and at intervals around the stationary contact leading-out terminal 21.

[0055] Specifically, the first arc barrier 6 may be of an integrated structure. For example, the first arc barrier 6 is integrally cylindrical or annular and sleeved outside the stationary contact leading-out terminal 21. The integrated structure is provided to reduce the assembly process of parts and has relatively low production costs.

[0056] In addition, the first arc barrier 6 may also be of a separated structure. The first arc barrier 6 includes a plurality of insulating monomers, which are arranged along a circumferential direction of the stationary contact leading-out terminal 21 and can be connected end to end into cylindrical, polygonal cylindrical and other structures. In some other embodiments, the plurality of insulating monomers may also be distributed around the stationary contact leading-out terminal 21 and in an annular shape with intervals therebetween, or a single insulating monomer may be arranged outside the stationary contact leading-out terminal 21. As long as the insulating and arc extinguishing effects can be achieved, no limitation is imposed herein in this embodiment.

[0057] In one embodiment, as shown in FIG. 6, the outer peripheral wall of the first arc barrier 6 protrudes beyond the outer peripheral wall of the stationary contact leading-out terminal 21. A first step 61 is formed between the bottom wall of the first arc barrier 6 and an outer peripheral wall of a corresponding stationary contact leading-out terminal 21.

[0058] The outer peripheral wall of the first arc barrier 6 and the outer peripheral wall of the stationary contact leading-out terminal 21 are not disposed coplanarly, or the first arc barrier 6 is not embedded into the outer peripheral wall of the stationary contact leading-out terminal 21, so that the first step 61 is formed between the bottom wall of the first arc barrier 6 and the outer peripheral wall of the corresponding stationary contact leading-out terminal 21. The first step 61 is closer to an are initiation point, to limit the upward movement of the arc along the surface of the stationary contact leading-out terminal 21, so as to reduce the ablation on the outer peripheral wall of the stationary contact leading-out terminal 21 and the ablation in the direction away from the movable contact piece 22, and achieve the purpose of consuming arc energy.

[0059] The outer peripheral wall of the first arc barrier 6 protrudes beyond the outer peripheral wall of the stationary contact.

[0060] The outer peripheral wall of the first arc barrier 6 protrudes from the outer peripheral wall of the stationary contact, and the stationary contact is located below the first arc barrier 6, so that the first step 61 is formed between the bottom wall of the first arc barrier 6 and the outer peripheral wall of the corresponding stationary contact. The first step 61 is closer to the are initiation point, to reduce the ablation on the outer peripheral wall of the stationary contact leading-out terminal 21 by the arc and the ablation in the direction away from the movable contact piece 22, so as to realize the protection of the stationary contact leading-out terminal 21.

[0061] In one embodiment, as shown in FIG. 6, the first gap 60 is provided between the inner wall at the bottom of the first arc barrier 6 and the outer wall of the stationary contact leading-out terminal 21. Specifically, the first gap 60 is provided between the inner peripheral wall at the bottom of the first arc barrier 6 and the outer peripheral wall at the bottom of the stationary contact leading-out terminal 21.

[0062] A connection between the bottom end face and the inner wall face of the first arc barrier 6 is an edge. The arc moves to the edge to form an arc concentration. Meanwhile, due to the existence of the first gap 60, part of the arc can enter the first gap 60, resulting in a height drop on the arc transfer path. This drop prevents the arc from moving easily in the direction away from the movable contact piece 22, and the combination of the edge and the drop impedes arc transfer.

[0063] In one embodiment, one end of the first gap 60 facing the movable contact piece 22 is provided with an open end and one end of the first gap away from the movable contact piece 22 is provided with a closed end.

[0064] The open end of the first gap 60 is used for introducing the arc, and the first gap 60 has a closed end, so that the first gap 60 is not a fully penetrating structure, thus a bend may be formed on the arc path.

[0065] It should be particularly noted that the arc barrier structure provided in this embodiment may include the first arc barrier 6, the first step 61 and the first gap 60. The first step 61 and the first gap 60 form a part of the arc barrier structure, which is used to restrict the arc from transferring along the stationary contact leading-out terminal 21 in the direction away from the movable contact piece 22 and restrict the arc from transferring toward a center line of the movable contact piece 22. The first arc barrier 6 made of insulating material has the performance of arc interruption or arc cooling, to achieve the arc extinguishing effect.

[0066] In one embodiment, as shown in FIG. 6, the inner wall of the first arc barrier 6 is provided with a positioning part 62 and the outer wall of the stationary contact leading-out terminal 21 is provided with a fitting part 211. The positioning part 62 is engaged with the fitting part 211.

[0067] When the first arc barrier 6 is mounted to the stationary contact leading-out terminal 21, the positioning part 62 and the fitting part 211 can perform initial positioning on the first arc barrier 6, to improve the mounting accuracy of the first arc barrier 6. Meanwhile, the positioning part 62 is engaged with the fitting part 211 to fix the first arc barrier 6 and prevent the first arc barrier 6 from falling off.

[0068] The positioning part 62 and the fitting part 211 may be a stop step, an annular positioning groove or a positioning protrusion, etc arranged on the stationary contact leading-out terminal 21. For example, the positioning part 62 is an annular clamping block arranged on the inner wall of the first arc barrier 6, the fitting part 211 is an annular clamping groove arranged on the outer wall of the stationary contact leading-out terminal 21, and the annular clamping block is engaged with the annular clamping groove. The positioning part 62 and the fitting part 211 provided in this embodiment are not limited to other forms, and any structures that can realize the positioning and fixing of the first arc barrier 6 relative to the stationary contact leading-out terminal 21 may be within the protection scope of this embodiment.

[0069] In some other embodiments, the positioning part may be disposed on the outer wall of the stationary contact leading-out terminal 21, and correspondingly, the fitting part is disposed on the inner wall of the first arc barrier 6.

[0070] In one embodiment, as shown in FIG. 6, a first guiding gap 63 is provided between an inner wall at a top of one end of the first arc barrier 6 away from the movable contact piece 22 and the outer wall of the corresponding stationary contact leading-out terminal 21, and the first guiding gap 63 is configured to guide the stationary contact leading-out terminal 21.

[0071] Since the first arc barrier 6 needs to be sleeved on the outer wall of the stationary contact leading-out terminal 21 from the bottom of the stationary contact leading-out terminal 21 when the first arc barrier 6 is mounted to the stationary contact leading-out terminal 21, the inner wall at the top of the first arc barrier 6 and the outer wall of the stationary contact leading-out terminal 21 are not attached to each other. The first guiding gap 63 is provided between the inner wall at the top of the first arc barrier 6 and the outer wall of the stationary contact leading-out terminal 21, and the first guiding gap 63 is used to guide the first arc barrier 6, thereby facilitating the installation of the first arc barrier 6.

[0072] It can be understood that the first guiding gap 63 may be of a horn-shaped structure, a large opening end of the first gap 60 is disposed away from the movable contact piece 22, and the large opening end of the first gap 60 provides an entrance through which the bottom of the stationary contact leading-out terminal 21 may pass, which further improves the convenience of installing the first arc barrier 6.

[0073] It should be particularly noted that in some other embodiments, a second arc barrier (not shown) may also be disposed outside the movable contact piece 22 to impede arc transfer.

[0074] In one embodiment, the contact unit provided in this embodiment further includes a contact container 1 (as shown in FIGS. 1-2). The contact container 1 includes an insulating cover 11, the movable contact piece 22 is movably disposed within the insulating cover 11, and the stationary contact leading-out terminal 21 is inserted into the insulating cover 11 and is at least partially disposed within the insulating cover 11.

[0075] The contact container 1 further includes a frame piece 12, the insulating cover 11 is connected to a yoke plate through the frame piece 12, and the insulating cover 11 and the yoke plate enclose a contact chamber. The contact chamber provides an arc isolation environment for the contact between the movable contact piece 22 and the stationary contact leading-out terminal 21, ensuring the reliability of the relay in use.

[0076] Certainly, in some other embodiments, the fitting part 211 may also be disposed on the inner wall of the insulating cover 11. Since the stationary contact leading-out terminal 21 partially extends into the insulating cover 11, the limiting of the first arc barrier 6 can also be achieved.

[0077] In one embodiment, the first arc barrier 6 is disposed outside the portion of the stationary contact leading-out terminal 21 located inside the insulating cover 11. The first arc barrier 6 isolates and protects the portion of the stationary contact leading-out terminal 21 located inside the insulating cover 11.

[0078] In one embodiment, a through hole 111 is provided at a top of the insulating cover 11, the stationary contact leading-out terminal 21 is disposed through the through hole 111, and a diameter of the outer peripheral wall of the first arc barrier 6 is less than or equal to a diameter of the through hole 111.

[0079] The through hole 111 of the insulating cover 11 provides a space through which the stationary contact leading-out terminal 21 may pass, and the diameter of the outer peripheral wall of the first arc barrier 6 is less than or equal to the diameter of the through hole 111, so that the first arc barrier 6 may at least partially shield the through hole 111 of the insulating cover 11, preventing arc splashes from entering the gap between the stationary contact leading-out terminal 21 and the through hole 111, so as to solve the problem of arc ablation splashing and contaminating the inner wall of the insulating cover 11, and increase an arc creepage distance and insulation resistance.

[0080] It can be understood that an outer contour of the first arc barrier 6 provided in this embodiment may be larger than the diameter of the through hole 111 of the top wall of the insulating cover 11, but is not necessarily larger than the through hole 111 on the top wall of the insulating cover 11; instead, the first step 61 and the first gap 60 formed between the bottom end of the first arc barrier 6 and the stationary contact leading-out terminal are used to block the transfer of the arc or an arc root.

[0081] In one embodiment, as shown in FIGS. 2 and 7, a side of the movable contact piece 22 facing the stationary contact leading-out terminal 21 is a top surface of the movable contact piece 22. An arc barrier portion is provided on the top surface of the movable contact piece 22 and is configured to impede the movement of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other.

[0082] The arc barrier portion is disposed on the top surface of the movable contact piece 22 to impede the transfer of the arc along the top surface of the movable contact piece 22, thereby isolating and cutting off the transfer path of the arc on the top surface of the movable contact piece 22, and impeding the transfer of the arc toward a center line of the movable contact piece 22 in a length direction, avoiding the arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, enabling the arc to be extinguished efficiently along the originally set arc extinguishing path of the magnetic blow-out field, and improving the arc extinguishing capability.

[0083] In one embodiment, the arc barrier portion is disposed between the inner edges of the two first contact parts 220 of the movable contact piece 22.

[0084] A portion where the movable contact piece 22 is in contact with the pair of stationary contact leading-out terminals 21 is the first contact part 220, and the arc barrier portion is disposed between the inner edges of the two first contact parts 220, to cut off the path of arc transferring toward an inner side of the stationary contact leading-out terminals 21, avoid the arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, and ensure the high efficiency and thoroughness of arc extinguishing.

[0085] It should be particularly noted that the inner side specifically refers to a side where the pair of stationary contact leading-out terminals 21 face each other (as shown in FIG. 2, Q refers to a direction in which the pair of stationary contact leading-out terminals 21 face each other, and M refers to the center line of the stationary contact leading-out terminals 21), or a side close to the center line W of the movable contact piece 22 in the length direction (as shown in FIG. 7, L refers to a length direction of the movable contact piece 22, and T refers to a width direction of the movable contact piece 22). Therefore, the arc barrier portion is disposed at the side of the first contact part 220 facing the inner side.

[0086] It can be understood that at least part of the first step 61 and / or the first gap 60 is disposed between the inner edges of the first contact part 220.

[0087] In one embodiment, as shown in FIGS. 7-8, the number of the arc barrier portions is two, the two arc barrier portions are arranged corresponding to the pair of stationary contact leading-out terminals 21, and a distance between the outer edges of the two arc barrier portions along the length direction of the movable contact piece 22 is less than or equal to a distance between the inner edges of the first contact part 220.

[0088] Specifically, since the number of the stationary contact leading-out terminals 21 is two, the two arc barrier portions are arranged corresponding to the two stationary contact leading-out terminals 21 and disposed at the inner side of the stationary contact leading-out terminals 21, so that the arc generated by the separation of the two sets of movable and stationary contacts is blocked through the two arc barrier portions respectively, playing a dual arc isolation role and further improving the arc isolation effect.

[0089] In one embodiment, as shown in FIG. 7, the arc barrier portion is a first arc barrier groove 222; as shown in FIG. 8, the arc barrier portion is an arc barrier rib 225. In some other embodiments, the movable contact piece 22 may be provided with the first arc barrier groove 222 and the arc barrier rib 225 simultaneously.

[0090] The arc barrier portion is the first arc barrier groove 222, which is a recessed structure provided on the top surface of the movable contact piece 22; the arc barrier portion is the arc barrier rib 225, which is a protruding structure provided on the top surface of the movable contact piece 22. These two structures can solve a problem of rapid arc transfer that may occur on the movable contact piece 22 with the top surface being a plane. The first arc barrier groove 222 and / or the arc barrier rib 225 can isolate and cut off the path of the arc transferring on the top surface of the movable contact piece 22, and impede the transfer of the arc toward the center line of the movable contact piece 22 in the length direction, avoiding arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21.

[0091] Specifically, the first arc barrier groove 222 includes a first groove wall and a first groove bottom that are connected to each other. The arc root moves to the connection between the first groove wall and the top surface of the movable contact piece 22 to form an arc concentration. A height difference between the top surface of one side of the movable contact piece 22 facing the stationary contact leading-out terminal 21 and the first groove bottom is used to impede the movement of the arc root toward the direction in which the pair of stationary contact leading-out terminals 21 face each other.

[0092] Since the first arc barrier groove 222 has a first groove wall and a first groove bottom connected with each other, the connection between the first groove wall and the top surface of the movable contact piece 22 is an edge. The arc root moves to the edge to form the arc concentration. Meanwhile, the height difference between the top surface of the movable contact piece 22 and the first groove bottom creates a drop on the arc transfer path, which can prevent the arc from easily moving toward the center line of the movable contact piece 22 in the length direction, and the combination of the edge and the drop can improve the arc extinguishing effect.

[0093] In one embodiment, the first arc barrier groove 222 is a through groove extending along a width direction of the movable contact piece 22.

[0094] If the first arc barrier groove 222 extends along the length direction of the movable contact piece 22, the arc may transfer along the portion of the top surface of the movable contact piece 22 where the first arc barrier groove 222 is not provided, resulting in a risk of arc short-circuit. Therefore, the first arc barrier groove 222 is configured as a through groove along the width direction of the movable contact piece 22. Since the through groove is arranged to penetrate the width direction of the movable contact piece 22, after the arc enters the first arc barrier groove 222, the transfer path of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other is completely cut off.

[0095] In one embodiment, the first arc barrier groove 222 has an arc-shaped structure, and the first arc barrier groove 222 is arranged around the stationary contact leading-out terminal 21.

[0096] Specifically, since the bottom of the stationary contact leading-out terminal 21 is similar to a cylindrical structure, the shape of the first arc barrier groove 222 is adapted to an outer contour of the bottom of the stationary contact leading-out terminal 21. The first arc barrier groove 222 with the arc-shaped structure is arranged along the outer contour of the stationary contact leading-out terminal 21 and around the stationary contact leading-out terminal 21, to impede the arc transfer path in all directions.

[0097] It can be understood that the first arc barrier groove 222 with the arc-shaped structure extends from one side to the other side of the movable contact piece 22 along the width direction, so that contact parts are formed on the portions at both ends of the movable contact piece 22 along the length direction where the first arc barrier groove 222 is not provided, and the contact parts are used for contacting the stationary contact leading-out terminal 21.

[0098] It should be particularly noted that, as shown in FIGS. 7-8, the first arc barrier groove 222 may be replaced by the arc barrier rib 225, and the arrangement position and shape of the arc barrier rib 225 are similar to those of the first arc barrier groove 222, which will not be repeated.

[0099] This embodiment also provides a relay, including the contact unit described above.

[0100] In the relay provided in this embodiment, the movable contact piece 22 and the pair of stationary contact leading-out terminals 21 of the contact unit are contacted with or separated from one another. When the movable contact piece 22 comes into contact with the stationary contacts at the bottom of the pair of stationary contact leading-out terminals 21, current flows in from one stationary contact leading-out terminal 21, passes through the movable contact piece 22 and then flows out of the other stationary contact leading-out terminal 21, thereby connecting the load.

[0101] In one embodiment, as shown in FIGS. 9-13, the relay further includes a push assembly 4, which includes a push rod unit 41, an elastic member 43 and a U-shaped bracket 42. The push rod unit 41 includes a base 413 and a push rod 411, and the base 413 and an upper part of the push rod 411 may be integrally injection-molded. The U-shaped bracket 42 and the base 413 enclose a frame structure, the movable contact piece 22 and the elastic member 43 are mounted within the frame structure enclosed by the U-shaped bracket 42 and the base 413. One end of the elastic member 43 abuts against the base 413, and the other end of the elastic member 43 abuts against the movable contact piece 22. The elastic member 43 may provide an elastic force, so that the movable contact piece 22 has a tendency to move away from the base 413 and approach the stationary contact leading-out terminal 21.

[0102] Specifically, the push rod unit 41 and the U-shaped bracket 42 are matched through the limiting protrusion 412 and the limiting hole. A moving force of the push rod unit 41 may be transmitted to the U-shaped bracket 42 for driving the movement of the movable contact piece 22, so that the movable contact piece 22 can be contacted with or separated from the pair of stationary contact leading-out terminals 21.

[0103] As shown in FIGS. 9-13, the push assembly 4 of the relay further includes an electromagnet unit 44, which is disposed at a side of a yoke plate facing away from the insulating cover 11. The push rod unit 41 is drivenly connected to the electromagnet unit 44, and the push rod unit 41 is movably disposed in a driving chamber enclosed by a metal cover and the yoke plate, and abuts against the movable contact piece 22 through a via hole of the yoke plate. When the electromagnet unit 44 is energized,the push rod unit 41 may be driven to move, to further drive the movable contact piece 22 to move, so as to contact with or separate from the stationary contact leading-out terminal 21.

[0104] The electromagnet unit 44 includes a coil bobbin 441, a coil 442, a stationary core (not shown), a movable core 443, a U-shaped yoke 445, a magnetic sleeve 446 and a spring 447. The coil bobbin 441 is disposed within the U-shaped yoke 445, the coil bobbin 441 is in a hollow cylindrical shape and made of an insulating material. The magnetic sleeve 446 is inserted into the coil bobbin 441, and the coil 442 is wound around the coil bobbin 441. The stationary core is provided with a first through hole that is arranged corresponding to the via hole of the yoke plate, through which the push rod unit 41 may pass. The movable core 443 is movably disposed within the magnetic sleeve 446 and arranged opposite to the stationary core. The spring 447 is disposed between the stationary core and the movable core 443 and is capable of abutting against each of them. The movable core 443 is connected to the push rod unit 41 and configured to be attracted by the stationary core when the coil 442 is energized. The movable core 443 and the push rod unit 41 may be connected by screwing, riveting, welding or other means.

[0105] The working process of the relay provided in this embodiment is as follows:

[0106] When the coil 442 is energized, the stationary core 444 attracts the movable core 443, the movable core 443 drives the push rod unit 41 to move upward, the spring 447 between the stationary core 444 and the movable core 443 is compressed, and the push rod unit 41 pushes the movable contact piece 22 to move by means of the U-shaped bracket 42 and the elastic member 43, so that the two ends of the movable contact piece 22 are respectively in contact with the two stationary contact leading-out terminals 21, to close the movable and stationary contacts.

[0107] When the current of the coil 442 is interrupted, the stationary core releases the attraction to the movable core 443. Under the elastic force of the compressed spring 447, the movable core 443 drives the push rod unit 41 to move downward, so that the movable contacts at the two ends of the movable contact piece 22 are separated from the two stationary contact leading-out terminals 21, to separate the movable and stationary contacts.

[0108] When the short-circuit load is large, under the action of the short-circuit current, an electro-dynamic repulsive force may be generated between the movable contact piece 22 and the stationary contact leading-out terminal 21, causing the contacts to bounce open, resulting in arc generation between the contacts and severe combustion thereof, and even causing an explosion.

[0109] For this purpose, the relay provided in this embodiment further includes an anti-short circuit assembly, which is disposed at least at the upper side of the movable contact piece 22 along an axial direction of the stationary contact leading-out terminal 21, and generates an attractive force when a high fault current occurs in the movable contact piece 22, to resist the electro-dynamic repulsive force between the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0110] The anti-short circuit assembly may also be a short-circuit ring disposed between the pair of stationary contact leading-out terminals 21. For a high-voltage DC relay, the first arc barrier 6 may prevent the arc from being attracted by the anti-short circuit assembly 3 to move toward the direction in which the pair of stationary contact leading-out terminals 21 face each other, thus avoiding the reduction of insulation between the contacts or arc short-circuit.

[0111] In one embodiment, as shown in FIGS. 9-10, the relay further includes an arc extinguishing unit 5, which is disposed within a hollow chamber of the housing and configured to extinguish the arc of the contact assembly 2. The arc extinguishing unit 5 includes two arc extinguishing magnets 51. The arc extinguishing magnets 51 may be permanent magnets, and each arc extinguishing magnet 51 may substantially be a cuboid. The two arc extinguishing magnets 51 are respectively disposed at both sides of the insulating cover 11 and oppositely arranged along the length direction of the movable contact piece 22.

[0112] In this embodiment, the two arc extinguishing magnets 51 are respectively located on the left and right sides of the insulating cover 11. The surfaces facing each other of the two arc extinguishing magnets 51 have opposite polarities. That is to say, a left surface of the arc extinguishing magnet 51 at the left side of the insulating cover 11 is an S pole and a right surface thereof is an N pole, and the left surface of the arc extinguishing magnet 51 at the right side of the insulating cover 11 is an S pole and the right surface thereof is an N pole.

[0113] Certainly, the surfaces facing each other of the two arc extinguishing magnets 51 may also be designed to have the same polarity. For example, the left surface of the arc extinguishing magnet 51 at the left side of the insulating cover 11 is an S pole and the right surface thereof is an N pole, and the left surface of the arc extinguishing magnet 51 at the right side of the insulating cover 11 is an N pole and the right surface thereof is an S pole.

[0114] In this way, by arranging two oppositely disposed arc extinguishing magnets 51, a magnetic field may be formed around the contact assembly 2.

[0115] Therefore, the arc generated between the stationary contact leading-out terminal 21 and the movable contact piece 22 may be elongated in the direction away from each other under the action of the magnetic field, thereby realizing arc extinguishing.

[0116] As shown in FIGS. 9-13, the arc extinguishing unit 5 further includes two yoke clamps 52, which are arranged in positions corresponding to the two arc extinguishing magnets 51. Moreover, the two yoke clamps 52 surround the insulating cover 11 and the two arc extinguishing magnets 51. The design of the yoke clamps 52 surrounding the arc extinguishing magnets 51 can prevent the magnetic field generated by the arc extinguishing magnets 51 from diffusing outward and affecting the arc extinguishing effect. The yoke clamps 52 are made of soft magnetic materials. The soft magnetic materials may include but are not limited to iron, cobalt, nickel and the alloys thereof, etc.Second Embodiment

[0117] This embodiment is similar to the first embodiment, with the difference in the structure of the first arc barrier groove 222.

[0118] As shown in FIGS. 14-16, the first arc barrier groove 222 provided in this embodiment has at least one of a linear structure, a convex structure and an X-shaped structure.

[0119] Specifically, as shown in FIG. 14, the first arc barrier groove 222 is of a linear structure with a simple structure and convenient production and processing. Moreover, since a width of the first arc barrier groove 222 along the length direction of the movable contact piece 22 is relatively narrow, the overall structural strength of the movable contact piece 22 is relatively high.

[0120] As shown in FIG. 15, the first arc barrier groove 222 has a convex structure, so that the first arc barrier groove 222 has a broken-line groove structure, which increases the tortuosity of the transfer path of the arc root, thereby improving the arc extinguishing effect.

[0121] As shown in FIG. 16, the first arc barrier groove 222 has an X-shaped structure. The X-shaped structure includes two intersecting linear grooves, so that the arc roots at each side can be blocked by the transfer path through the two linear grooves , playing a dual arc isolation role with good isolation and arc extinguishing effects.

[0122] It can be understood that the two first arc barrier grooves 222 in this embodiment may have the same or different shapes. For example, one of the first arc barrier grooves 222 has a convex structure, and the other of the first arc barrier grooves 222 has a linear structure.

[0123] It can be understood that the first arc barrier groove 222 provided in this embodiment includes but is not limited to the linear structure and the X-shaped structure, and may also have an S-shaped structure, a tapered structure, etc. Its specific shape can be adjusted according to actual production conditions.

[0124] It should be particularly noted that, as shown in FIGS. 17-19, the first arc barrier groove 222 may be replaced by an arc barrier rib 225, and the arrangement position and shape of the arc barrier rib 225 are similar to those of the first arc barrier groove 222, which will not be repeated.Third Embodiment

[0125] This embodiment is similar to the first embodiment, with the only difference in the quantity and structure of the arc barrier portions.

[0126] As shown in FIGS. 20-21, the number of the arc barrier portions provided in this embodiment is one, and the portions of the movable contact piece 22, which are not provided with the arc barrier portions, are located at both sides along the length direction of the movable contact piece 22 and respectively in contact with the pair of stationary contact leading-out terminals 21.

[0127] Specifically, when the arc barrier portion is the first arc barrier groove 222, since one first arc barrier groove 222 is disposed between the pair of stationary contact leading-out terminals 21, and the width of the first arc barrier groove 222 along the length direction of the movable contact piece 22 is relatively wide, the portions of the movable contact piece 22, which are not provided with the first arc barrier groove 222 and disposed on both ends along the length direction of the movable contact piece 22 are respectively two contact parts. The two contact parts are in contact with the pair of stationary contact leading-out terminals 21 respectively. The arc isolation process for the two sets of movable and stationary contacts can be realized by using one first arc barrier groove 222, which has a simple structure and relatively low production cost.

[0128] In one embodiment, as shown in FIGS. 2 and 20, a distance between the two side edges of the first arc barrier groove 222 along the length direction of the movable contact piece 22 is less than or equal to a distance between the bottoms of the pair of stationary contact leading-out terminals 21.

[0129] Specifically, the width of the first arc barrier groove 222 along the length direction of the movable contact piece 22 extends to a vicinity of the inner side edges of the bottoms of the stationary contact leading-out terminals 21 or is flush with the inner side edges of the bottoms of the stationary contact leading-out terminals 21, so that the edge between the first groove wall of the first arc barrier groove 222 and the top surface of the movable contact piece 22 is as close as possible to the bottoms of the stationary contact leading-out terminals 21. The arc can be concentrated at the edge as soon as possible, and the drop between the top surface of the movable contact piece 22 and the first groove bottom of the first arc barrier groove 222 is utilized to reduce the risk of the arc root transferring toward the center line of the movable contact piece 22.

[0130] It should be particularly noted that, as shown in FIGS. 20-21, the first arc barrier groove 222 may be replaced by the arc barrier rib 225, and the arrangement position and shape of the arc barrier rib 225 are similar to those of the first arc barrier groove 222, which will not be repeated.

[0131] The other embodiments are similar to the first embodiment and the second embodiment, with the difference in that other detailed structures of the movable contact piece 22 are added on the basis of the first embodiment or the second embodiment.

[0132] In the movable contact piece 22 provided in this embodiment, a second arc barrier groove (not shown) may also be provided on the side wall of the movable contact piece 22, and the second arc barrier grooves are configured to impede the movement of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other.

[0133] The second arc barrier grooves are disposed on the side walls of the movable contact piece 22 to impede the arc transfer along the side walls of the movable contact piece 22 toward the center line of the movable contact piece 22 in the length direction, thereby isolating and cutting off the transfer path of the arc on the side walls of the movable contact piece 22, avoiding the arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, enabling the arc to be extinguished efficiently along the originally set arc extinguishing path of the magnetic blow-out field, and improving the arc extinguishing capability.

[0134] In one embodiment, the second arc barrier grooves are disposed between the inner edges of the two first contact parts 220.

[0135] In other words, the second arc barrier portions are disposed at the inner side of the stationary contact leading-out terminals 21, to cut off the transfer path of the arc root toward the inner side of the stationary contact leading-out terminals 21, avoid the arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, and ensure the high efficiency and thoroughness of arc extinguishing.

[0136] In one embodiment, the number of the second arc barrier grooves is multiple, and the multiple second arc barrier grooves are disposed at both sides of the movable contact piece 22 along the length direction of the movable contact piece 22; and / or, the number of the second arc barrier grooves is multiple, and the multiple second arc barrier grooves are disposed at both sides of the movable contact piece 22 along the width direction of the movable contact piece 22.

[0137] For example, the number of the second arc barrier grooves is four, with two second arc barrier grooves provided at each side of the movable contact piece 22 along its length direction, and two second arc barrier grooves provided at each side of the movable contact piece 22 along its width direction. The four second arc barrier grooves are disposed at four corners of a thrust part 221 of the movable contact piece 22, so that the arc root may be isolated by the second arc barrier grooves no matter in which directions the arc transfers along the side walls of the movable contact piece 22, which can improve the arc isolation effect.

[0138] In one embodiment, the second arc barrier groove includes a second groove wall and a second groove bottom that are connected to each other. The arc moves to the connection between the second groove wall and the side wall of the movable contact piece 22 to form an arc concentration. A height difference between the side wall of the movable contact piece 22 and the second groove bottom is used to impede the movement of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other.

[0139] Since the second arc barrier groove has the second groove wall and the second groove bottom connected with each other, the connection between the second groove wall and the side wall of the movable contact piece 22 is an edge. The arc moves to the edge to form an arc concentration. The height difference between the side wall of the movable contact piece 22 and the second groove bottom creates a drop on the arc transfer path along the side wall of the movable contact piece 22, which can prevent the arc from easily moving toward the center line of the movable contact piece 22 in the length direction, and the combination of the edge and the drop can improve the arc extinguishing effect.

[0140] In one embodiment, the second arc barrier groove is a through groove extending along the axial direction of the stationary contact leading-out terminal 21.

[0141] If the second arc barrier groove extends along the length direction of the movable contact piece 22, the arc can transfer along the part of the side wall of the movable contact piece 22 where the second arc barrier groove is not provided, resulting in a risk of arc short-circuit. Therefore, the second arc barrier groove is configured as a through groove extending along an axial direction of the stationary contact leading-out terminal 21. Since the through groove is arranged to penetrate a height direction of the movable contact piece 22, after the arc enters the second arc barrier groove, the transfer path of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other is completely cut off.

[0142] It should be noted herein that the movable contact piece shown in the accompanying drawings and described in the present specification is merely an example used in the principles of the present disclosure. Those skilled in the art should clearly understand that the principles of the present disclosure are not limited to any details or any components of the devices shown in the accompanying drawings or described in the specification.

[0143] Furthermore, the present disclosure also provides an arc barrier structure, a contact unit and a relay with reliable arc interruption and good safety performance.

[0144] According to a first aspect of the present disclosure, there is provided an arc barrier structure, including: a first arc barrier mounted on a movable contact piece, and the movable contact piece is configured to be contacted with or separated from a pair of stationary contact leading-out terminals.

[0145] In some implementations, the first arc barrier is sleeved on the outer wall of the stationary contact leading-out terminal.

[0146] In some implementations, a first step is provided between the first arc barrier and the movable contact piece for impeding the arc transfer; and / or, a first gap is provided between the first arc barrier and the movable contact piece for preventing the arc transfer.

[0147] In some implementations, a portion of the movable contact piece which is in contact with the pair of stationary contact leading-out terminals is a first contact part, and the first step and / or the first gap is disposed between inner edges of the first contact part.

[0148] In some implementations, the first arc barrier comprises a column, and a top surface at one end of the column facing the stationary contact leading-out terminals protrudes from a top surface at one end of the movable contact piece facing the stationary contact leading-out terminals, so that the first step is formed between the top surface of the column and the top surface of the movable contact piece.

[0149] In some implementations, the first gap is disposed along an axial direction of the column.

[0150] In some implementations, one end of the first gap facing the stationary contact leading-out terminals is an open end, and one end of the first gap facing away from the stationary contact leading-out terminals is a closed end.

[0151] In some implementations, a mounting groove is provided on a side wall of the movable contact piece, the column is at least partially disposed within the mounting groove, and the first gap is disposed between the column and the mounting groove.

[0152] In some implementations, the mounting groove comprises a first mounting portion that is disposed at a side of the movable contact piece facing the stationary contact leading-out terminals, the column is disposed through the first mounting portion, and the first gap is disposed between the column and the first mounting portion.

[0153] In some implementations, the mounting groove further comprises a fixing portion that is in communication with the first mounting portion, and the column is engaged with the fixing portion to fix the first arc barrier.

[0154] In some implementations, the mounting groove further comprises a second mounting portion, the second mounting portion is disposed at a side of the movable contact piece away from the stationary contact leading-out terminals, the second mounting portion is in communication with the first mounting portion through the fixing portion, the column is disposed through the second mounting portion, and a first guiding gap is provided between an outer wall of the column and an inner wall of the second mounting portion and configured to guide the column.

[0155] In some implementations, the first arc barrier further comprises a limiting part that is disposed at a side of the column away from the movable contact piece and is capable of abutting against the movable contact piece to limit the column.

[0156] In some implementations, the first arc barrier further comprises an arc barrier ring that wraps an end of the movable contact piece along a length direction of the movable contact piece and at least part of a side wall of the movable contact piece.

[0157] In some implementations, the first arc barrier further comprises a connecting part that is disposed at a bottom of one end of the movable contact piece away from the stationary contact leading-out terminals and is respectively connected to two ends of the arc barrier ring, and the column is disposed on the connecting part.

[0158] According to a second aspect of the present disclosure, a contact unit of the embodiments of the present disclosure includes a movable contact piece, a pair of stationary contact leading-out terminals, and the arc barrier structure as described above. The movable contact piece is configured to be contacted with or separated from the pair of stationary contact leading-out terminals, the arc barrier structure is disposed outside the movable contact piece, and the arc barrier structure is configured to impede arc transfer.

[0159] In some implementations, a side of the movable contact piece facing the stationary contact leading-out terminals is a top surface of the movable contact piece, an arc barrier part is provided on the top surface of the movable contact piece, and the arc barrier part is configured to impede an arc from moving toward a direction in which the pair of stationary contact leading-out terminals face each other.

[0160] In some implementations, the arc barrier part is a first arc barrier groove; and / or, the arc barrier part is an arc barrier rib.

[0161] In some implementations, a portion of the movable contact piece is in contact with the pair of stationary contact leading-out terminals is a first contact part, and the arc barrier part is disposed between inner edges of the first contact part.

[0162] In some implementations, a short-circuit resistant assembly is further included, and the short-circuit resistant assembly is at least disposed at a side of the movable contact piece facing the stationary contact leading-out terminals and generates an attractive force when a high fault current occurs in the movable contact piece to resist an electro-dynamic repulsive force between the movable contact piece and the stationary contact leading-out terminals.

[0163] According to a third aspect of the present disclosure, a relay of the embodiments of the present disclosure includes the contact unit as described above.

[0164] One embodiment of the present disclosure has following advantages or beneficial effects:

[0165] In the arc barrier structure provided by the embodiment of the present disclosure, since the arc is likely to be generated when the stationary contact leading-out terminals are separated from the movable contact piece, the first arc barrier is disposed on the movable contact piece to be close to the arc initiation point, thereby better impeding the arc transfer.

[0166] In the contact unit and the relay provided by the embodiment of the present disclosure, the arc barrier structure is disposed outside the movable contact piece and can impede the arc transfer, thereby reducing a risk of ablation of the movable contact piece by the arc and achieving the protection of the movable contact piece.

[0167] Hereinafter, example embodiments will be described more fully with reference to the accompanying drawings.Fourth Embodiment

[0168] The present embodiment provides a contact unit. As shown in FIGS. 22-23, the contact unit includes a contact assembly 2. The contact assembly 2 includes a movable contact piece 22 and a pair of stationary contact leading-out terminals 21. The movable contact piece 22 is configured to contact with or separate from the pair of stationary contact leading-out terminals 21.

[0169] In the contact unit provided by the present embodiment, the movable contact piece 22 is contacted with or separated from the pair of stationary contact leading-out terminals 21. When the movable contact piece 22 comes into contact with stationary contacts at the bottom of the pair of stationary contact leading-out terminals 21, current flows in from one stationary contact leading-out terminal 21, passes through the movable contact piece 22 and then flows out of the other stationary contact leading-out terminal 21, thereby realizing load connection.

[0170] When the movable contact piece 22 is separated from the stationary contacts at the bottom of the pair of stationary contact leading-out terminals 21, along with the separation of the movable and stationary contacts between the movable contact piece 22 and the stationary contact leading-out terminals 21 and a magnetic blow arc-pulling, if the arc is pulled to a certain extent, the arc will be extinguished automatically; if the arc is not stable enough, it may transfer on the surface of the movable contact piece 22 or the stationary contact leading-out terminal 21, the arc cannot be extinguished mainly along the magnetic blow-out arc pulling path, eventually resulting in failure to break the arc and even explosion and burnout of the relay.

[0171] In order to solve this problem, as shown in FIGS. 23-26, the contact unit provided by the present embodiment further includes an arc barrier structure, which is disposed outside the movable contact piece 22 and configured to impede arc transfer.

[0172] In the contact unit provided in this embodiment, an arc barrier structure is disposed outside the movable contact piece 22, and the arc barrier structure can impede the arc transfer, thereby reducing the risk of ablation of the movable contact piece 22 by the arc and achieving protection of the movable contact piece 22.

[0173] Specifically, as shown in FIG. 25 to FIG. 31, the arc barrier structure provided in this embodiment includes a first arc barrier 7 which is disposed on the movable contact piece 22, and the first arc barrier 7 is configured to impede the arc transfer.

[0174] For the arc barrier structure provided in this embodiment, since an arc is likely to be generated when the stationary contact leading-out terminal 21 is separated from the movable contact piece 22, the first arc barrier 7 is disposed on the movable contact piece 22 to be close to the arc initiation point and better impede the arc transfer.

[0175] A first step 71 is provided between the first arc barrier 7 and the movable contact piece 22, to impede the arc transfer; and / or, a first gap 72 is provided between the first arc barrier 7 and the movable contact piece 22, to impede the arc transfer.

[0176] In the arc barrier structure provided by the present embodiment, the first step 71 and / or the first gap 72 is provided at a position where the first arc barrier 7 is in contact with the movable contact piece 22 and disposed on a moving path of the arc, that is, a bend is formed on the arc path, which can consume the kinetic energy of the arc and better block the arc transfer. The arc has two transfer directions: first, the first step 71 and / or the first gap 72 can block the arc from transferring along the movable contact piece 22 toward the direction in which the pair of stationary contact leading-out terminals 21 face each other, to avoid the occurrence of arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21; second, the first step 71 and / or the first gap 72 can block the arc from transferring downward along the movable contact piece 22 toward a direction away from the stationary contact leading-out terminals 21, further reduce the ablation of the outer wall of the movable contact piece 22 by the arc, improve the arc extinguishing capability and effect, and thus improve the breaking capability between the movable contact and the stationary contact corresponding to the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0177] In one embodiment, the first arc barrier 7 is made of an insulating material.

[0178] Specifically, the first arc barrier 7 may be made of insulating materials such as ceramics, glass, rubber or plastic. The first arc barrier 7 made of the insulating material has good arc extinguishing or arc cooling performance, with strong arc extinguishing capacity and good arc extinguishing effect.

[0179] It can be understood that in some other embodiments, the first arc barrier 7 may also be made of a metal material.

[0180] In one embodiment, the first arc barrier 7 is sleeved on an outer wall of the movable contact piece 22.

[0181] The first arc barrier 7 may also be referred to as an arc barrier sleeve. The first arc barrier 7 is sleeved on the outer wall of the movable contact piece 22 to perform arc isolation treatment on an outer peripheral side of a contact area corresponding to the movable contact of the movable contact piece 22, which can achieve more comprehensive arc isolation and is conducive to arc extinguishing.

[0182] It can be understood that the number of the first arc barriers 7 is two, and the two first arc barriers 7 are respectively disposed at two ends of the movable contact piece 22 along the length direction.

[0183] In this way, the two sets of fixed and movable contacts between the movable contact piece 22 and the stationary contact leading-out terminal 21 correspond to the two first arc barriers 7 respectively, so that each set of fixed and movable contacts may use a corresponding first arc barrier 7 for arc isolation, which can achieve double arc extinguishing and improve the thoroughness of the arc extinguishing.

[0184] In one embodiment, as shown in FIG. 25 to FIG. 31, the first arc barrier 7 includes a column 70. A top surface of the column 70 facing the stationary contact leading-out terminal 21 protrudes from the movable contact piece 22, so that a first step 71 is formed between the top surface of the column 70 and the top surface of the movable contact piece 22.

[0185] Since the top surface of the column 70 in the first arc barrier 7 protrudes from the top surface of the movable contact piece 22, the top of the column 70 and the top surface of the movable contact piece 22 are not disposed coplanarly, or the column 70 is not embedded within the top surface of the movable contact piece 22, thus the first step 71 is formed between the top surface of the movable contact piece 22 and the top of the column 70 extending beyond thereto. The first step 71 is closer to the arc initiation point, thereby isolating and cutting off a transfer path of the arc on the top surface of the movable contact piece 22 and impeding the arc from transferring to a center line of the movable contact piece 22 along the length direction, avoiding the short circuit of the arc generated by the two sets of fixed and movable contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, enabling the arc to be extinguished efficiently on the originally set arc extinguishing path of the magnetic blow-out field and improving the arc extinguishing capacity.

[0186] In one embodiment, as shown in FIG. 25 to FIG. 31, a mounting groove 223 is disposed on the side wall of the movable contact piece 22, the column 70 is at least partially disposed within the mounting groove 223, and the first gap 72 is disposed between the column 70 and the mounting groove 223. The first gap 72 is disposed along an axial direction of the column 70.

[0187] The mounting groove 223 is disposed on the side wall of the movable contact piece 22, and the mounting groove 223 not only provides an accommodating space for the column 70 but also functions to mount the column 70. The outer wall of the column 70 and the inner wall of the mounting groove 223 are not attached to each other, and the first gap 72 is disposed between the outer wall of the column 70 and the inner wall of the mounting groove 223. Due to the existence of the first gap 72, a part of the arc can enter the first gap 72. The first gap 72 provides an accommodating space for the arc, which can reduce the risk of the part of the arc transferring along the movable contact piece 22 in the direction away from the stationary contact leading-out terminal 21 and improve the arc extinguishing effect.

[0188] In one embodiment, one end of the first gap 72 facing the stationary contact leading-out terminal 21 is provided with an open end, and one end of the first gap 72 facing away from the stationary contact leading-out terminal 21 is a closed end.

[0189] The open end of the first gap 72 is configured to introduce an arc, and the first gap 72 is provided with a closed end. The first gap 72 is a non-fully penetrating structure, so that a bend may be formed in the arc path.

[0190] In one embodiment, as shown in FIG. 25 to FIG. 31, the mounting groove 223 includes a first mounting portion 2231. The first mounting portion 2231 is disposed at the side of the movable contact piece 22 facing the stationary contact leading-out terminal 21. The column 70 is disposed through the first mounting portion 2231. The first gap 72 is disposed between the column 70 and the first mounting portion 2231.

[0191] The first mounting portion 2231 is disposed on the side wall of the movable contact piece 22 and also on one side of the movable contact piece 22 facing the stationary contact leading-out terminal 21, that is, the first mounting portion 2231 is located at an upper part of the side wall of the movable contact piece 22. The first gap 72 is disposed between the first mounting portion 2231 and the column 70. Since the first gap 72 is closer to a position where the movable contact piece 22 is in contact with the stationary contact leading-out terminal 21, enabling a part of the arc to enter the first gap 72 directly.

[0192] In addition, a connection between the top surface and the side surface of the column 70 is an edge, and the arc moves to the edge to form an arc concentration. Meanwhile, due to the existence of the first gap 72, a part of the arc may enter the first gap 72, resulting in a height drop in the arc transfer path. The drop makes it difficult for the arc to move further toward the direction away from the stationary contact leading-out terminal 21. The combination of the edge and the drop can improve the arc extinguishing effect.

[0193] In one embodiment, the first gap 72 is a horn-shaped structure with a large opening end disposed facing the stationary contact leading-out terminal 21.

[0194] In one embodiment, as shown in FIG. 25 to FIG. 31, the mounting groove 223 further includes a fixing portion 2232. The fixing portion 2232 is in communication with the first mounting portion 2231, and the column 70 is engaged with the fixing portion 2232 to fix the first arc barrier 7.

[0195] Specifically, the column 70 is engaged with the fixing portion 2232, that is, the outer wall of the column 70 is attached to or in an interference fit with the inner wall of the fixing portion 2232. The fixing portion 2232 functions to clamp and fix the column 70, to avoid the disengagement of the first arc barrier 7 from the movable contact piece 22.

[0196] In one embodiment, as shown in FIG. 25 to FIG. 31, the mounting groove 223 further includes a second mounting portion 2233. The second mounting portion 2233 is disposed at the side of the movable contact piece 22 away from the stationary contact leading-out terminal 21. The second mounting portion 2233 is in communication with the first mounting portion 2231 through the fixing portion 2232. The column 70 is disposed through the second mounting portion 2233. A first guiding gap 73 is disposed between the outer wall of the column 70 and the inner wall of the second mounting portion 2233. The first guiding gap 73 is configured to guide the column 70.

[0197] The second mounting portion 2233 is disposed at a side of the movable contact piece 22 away from the stationary contact leading-out terminal 21, that is, the second mounting portion 2233 is located at the lower part of the side wall of the movable contact piece 22. The first guiding gap 73 is disposed between the first mounting portion 2231 and the column 70. The first guiding gap 73 is configured to guide the column 70. Since the column 70 needs to pass through the mounting groove 223 of the movable contact piece 22 from the bottom of the movable contact piece 22 when the first arc barrier 7 is mounted on the movable contact piece 22, the first guiding gap 73 is disposed between the outer wall of the column 70 and the inner wall of the second mounting portion 2233, that is, the outer wall of the column 70 and the inner wall of the second mounting portion 2233 are not attached to each other. The first guiding gap 73 is used to provide a guiding effect for the column 70, facilitating the mounting of the column 70 of the first arc barrier 7.

[0198] It can be understood that the first guiding gap 73 may be a horn-shaped structure with a large opening end disposed facing away from the stationary contact leading-out terminal 21. The large opening end of the first gap 72 serves as an inlet for the passage of the column 70, which further improves the mounting convenience of the first arc barrier 7.

[0199] In one embodiment, as shown in FIG. 25 to FIG. 31, the number of the columns 70 is two. The two mounting grooves 223 are disposed on both sides of the movable contact piece 22 along the width direction of the movable contact piece 22 and between the inner edges of the first contact part 220. The two columns 70 are disposed corresponding to the two mounting grooves 223.

[0200] Specifically, the two columns 70 are disposed correspondingly along the width direction of the movable contact piece 22. The two columns 70 may completely cut off the transfer path of the arc toward the direction where the pair of stationary contact leading-out terminals 21 face each other, which can achieve good arc isolation effect.

[0201] In one embodiment, as shown in FIG. 25 to FIG. 31, the first arc barrier 7 further includes a limiting part 74. The limiting part 74 is disposed at the side of the column 70 away from the movable contact piece 22 and may abut against the movable contact piece 22 to limit the column 70.

[0202] When the first arc barrier 7 is mounted to the movable contact piece 22, the limiting part 74 may abut against the movable contact piece 22 to perform initial positioning and limiting on the column 70 of the first arc barrier 7, and improve the mounting accuracy of the first arc barrier 7.

[0203] In one embodiment, as shown in FIG. 25 to FIG. 31, the first arc barrier 7 further includes an arc barrier ring 75. The arc barrier ring 75 wraps the end of the movable contact piece 22 along the length direction of the movable contact piece 22 and at least part of the side wall of the movable contact piece 22.

[0204] The arc barrier ring 75 of the first arc barrier 7 wraps the end of the movable contact piece 22 and at least part of the side wall of the movable contact piece 22, which is equivalent to mounting an arc barrier sleeve on the outer peripheral side of the contact area between the stationary contact leading-out terminal 21 and the movable contact piece 22, which can reduce the ablation of the outer wall of the movable contact piece 22 by the arc and impede the arc from transferring downward along the side wall of the movable contact piece 22, and is conducive to arc extinguishing. In addition, the arc barrier ring 75 is a hollow structure, that is, a central hole is disposed at a center of the arc barrier ring 75, and the arc barrier ring 75 functions to reduce weight, to meet the requirement of lightweight.

[0205] In one embodiment, as shown in FIG. 25 to FIG. 31, the first arc barrier 7 further includes a connecting part 76. The connecting part 76 is disposed at the bottom of one end of the movable contact piece 22 away from the stationary contact leading-out terminal 21 and connected to both ends of the arc barrier ring 75 respectively. The column 70 is disposed on the connecting part 76.

[0206] If the arc barrier ring 75 has an open end, the arc barrier ring 75 is of an open structure. The connecting part 76 is connected to both ends of the arc barrier ring 75 respectively, so that the first arc barrier 7 is an integrated structure to improve the fixing effect between the first arc barrier 7 and the movable contact piece 22. Meanwhile, the connecting part 76 is located at the bottom of the movable contact piece 22 and may not interfere with the mutual contact between the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0207] It should be specially noted that the relay contact assembly 2 provided in this embodiment may be provided with the first arc barrier 7, the first step 71 and the first gap 72 simultaneously. The first step 71 and the first gap 72 form a partial arc barrier structure for restricting part of the arc or the arc from transferring along the movable contact piece 22 toward the direction away from the stationary contact leading-out terminal 21 and restricting part of the arc from transferring along the movable contact piece 22 toward the direction in which the pair of stationary contact leading-out terminals 21 face each other. The first arc barrier 7 made of the insulating material has the performance of arc breaking or arc cooling to achieve the effect of arc extinguishing.

[0208] It should be specially noted that in some other embodiments, a second arc barrier may also be disposed outside the stationary contact leading-out terminal 21 to impede the arc transfer and protect the stationary contact leading-out terminal 21.

[0209] In one embodiment, as shown in FIG. 32, the contact unit provided in this embodiment further includes a contact container 1. The contact container 1 includes an insulating cover 11. The movable contact piece 22 is movably disposed within the insulating cover 11. The stationary contact leading-out terminal 21 is inserted into the insulating cover 11 and at least partially disposed in the insulating cover 11.

[0210] The insulating cover 11 and the yoke plate are connected by a frame piece 12, and the insulating cover 11 and the yoke plate enclose a contact chamber. The contact chamber provides an arc isolation environment for the contact between the movable contact piece 22 and the stationary contact leading-out terminal 21, to ensure the reliability of the relay during use.

[0211] In one embodiment, as shown in FIG. 33, the portion of the movable contact piece 22 is in contact with the pair of stationary contact leading-out terminals 21 is the first contact part 220. The first step 71 and / or the first gap 72 is disposed between the inner edges of the first contact part 220.

[0212] Specifically, the first contact part 220 is specifically two sets of movable contacts. Since an arc is generated at a portion where the movable contact piece 22 and the pair of stationary contact leading-out terminals 21 are in contact with each other, the first step 71 and / or the first gap 72 is disposed between the inner edges of the first contact part 220, and the first step 71 and / or the first gap 72 can cut off a lateral transfer path of the arc, to avoid the short circuit of the arc generated by the two sets of fixed and movable contacts.

[0213] In one embodiment, as shown in FIGS. 33 and 34, there is provided a movable contact piece 22 in this embodiment, one surface of the movable contact piece 22 facing the stationary contact leading-out terminal 21 is a top surface of the movable contact piece 22. An arc barrier portion is provided on the top surface of the movable contact piece 22 and is configured to impede the movement of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other.

[0214] The arc barrier portion is disposed on the top surface of the movable contact piece 22 to impede the transfer of the arc along the top surface of the movable contact piece 22, thereby isolating and cutting off the transfer path of the arc on the top surface of the movable contact piece 22, and impeding the transfer of the arc toward a center line of the movable contact piece 22 in a length direction, avoiding the arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, enabling the arc to be extinguished efficiently along the originally set arc extinguishing path of the magnetic blow-out field, and improving the arc extinguishing capability.

[0215] In one embodiment, as shown in FIGS. 12 and 13, the arc barrier portion is disposed between the inner edges of the two first contact parts 220.

[0216] A portion where the movable contact piece 22 is in contact with the pair of stationary contact leading-out terminals 21 is the first contact part 220, and the arc barrier portion is disposed between the inner edges of the first contact part 220, to cut off the path of arc transferring toward an inner side of the stationary contact leading-out terminals 21, avoid the arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, and ensure the high efficiency and thoroughness of arc extinguishing.

[0217] It should be particularly noted that the inner side specifically refers to a side where the pair of stationary contact leading-out terminals 21 face each other (as shown in FIG. 23, Q refers to a direction in which the pair of stationary contact leading-out terminals 21 face each other, and M refers to the center line of the stationary contact leading-out terminals 21), or a side close to the center line W of the movable contact piece 22 in the length direction (as shown in FIG. 33, L refers to a length direction of the movable contact piece 22, and T refers to a width direction of the movable contact piece 22). Therefore, the arc barrier portion is disposed on the side of the first contact part 220 facing the inner side.

[0218] In one embodiment, the number of the arc barrier portions is two, the two arc barrier portions are arranged corresponding to the pair of stationary contact leading-out terminals 21, and a distance between the outer edges of the two arc barrier portions along the length direction of the movable contact piece 22 is less than or equal to a distance between the inner edges of the first contact part 220.

[0219] Specifically, since the number of the stationary contact leading-out terminals 21 is two, the two arc barrier portions are arranged corresponding to the two stationary contact leading-out terminals 21 and disposed on the inner side of the stationary contact leading-out terminals 21, so that the arc generated by the separation of the two sets of movable and stationary contacts are subjected to arc isolation through the two arc barrier portions respectively, playing a dual arc isolation role and further improving the arc isolation effect.

[0220] In one embodiment, as shown in FIG. 33, the arc barrier portion is a first arc barrier groove 222; as shown in FIG. 34, the arc barrier portion is an arc barrier rib 225. In some other embodiments, both the first arc barrier groove 222 and the arc barrier rib 225 may be provided on the movable contact piece 22.

[0221] When the first arc barrier portion is the first arc barrier groove 222, a recessed structure is provided on the top surface of the movable contact piece 22; when the first arc barrier portion is the arc barrier rib 225, a protruding structure is provided on the top surface of the movable contact piece 22. These two structures can solve a problem of rapid arc transfer that may occur on the movable contact piece 22 having a top surface that is a plane. The first arc barrier groove 222 and / or the arc barrier rib 225 can isolate and cut off the path of the arc transferring on the top surface of the movable contact piece 22, and impede the transfer of the arc toward the center line of the movable contact piece 22 in the length direction, avoiding arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21.

[0222] Specifically, the first arc barrier groove 222 includes a first groove wall and a first groove bottom that are connected to each other. The arc moves to the connection between the first groove wall and the top surface of the movable contact piece 22 to form an arc concentration. A height difference between the top surface of one side of the movable contact piece 22 facing the stationary contact leading-out terminal 21 and the first groove bottom is used to impede the movement of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other.

[0223] Since the first arc barrier groove 222 has a first groove wall and a first groove bottom connected with each other, the connection between the first groove wall and the top surface of the movable contact piece 22 is an edge. The arc moves to the edge to form the arc concentration. Meanwhile, the height difference between the top surface of the movable contact piece 22 and the first groove bottom creates a drop on the arc transfer path, which can prevent the arc from easily moving toward the center line of the movable contact piece 22 in the length direction, and the combination of the edge and the drop can improve the arc extinguishing effect.

[0224] In one embodiment, as shown in FIG. 28, the first arc barrier groove 222 is a through groove extending along a width direction of the movable contact piece 22.

[0225] If the first arc barrier groove 222 extends along the length direction of the movable contact piece 22, the arc may transfer along the portion of the top surface of the movable contact piece 22 where the first arc barrier groove 222 is not provided, resulting in a risk of arc short-circuit. Therefore, the first arc barrier groove 222 is configured as a through groove along the width direction of the movable contact piece 22. Since the through groove is arranged to penetrate the width direction of the movable contact piece 22, after the arc enters the first arc barrier groove 222, the transfer path of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other is completely cut off.

[0226] In one embodiment, the first arc barrier groove 222 has an arc-shaped structure, and the first arc barrier groove 222 is arranged around the stationary contact leading-out terminal 21.

[0227] Specifically, since the bottom of the stationary contact leading-out terminal 21 is similar to a cylindrical structure, the shape of the first arc barrier groove 222 is adapted to an outer contour of the bottom of the stationary contact leading-out terminal 21. The first arc barrier groove 222 with the arc-shaped structure is arranged along the outer contour of the stationary contact leading-out terminal 21 and around the stationary contact leading-out terminal 21, to impede the arc transfer path in all directions.

[0228] It can be understood that the first arc barrier groove 222 with the arc-shaped structure extends from one side to the other side of the movable contact piece 22 along the width direction, so that contact parts are formed on the portions at both ends of the movable contact piece 22 along the length direction where the first arc barrier groove 222 is not provided, and the contact parts are used for contacting the stationary contact leading-out terminal 21.

[0229] It should be particularly noted that, the first arc barrier groove 222 may be replaced by the arc barrier rib 225, and the arrangement position and shape of the arc barrier rib 225 are similar to those of the first arc barrier groove 222, which will not be repeated.

[0230] This embodiment also provides a relay, including the contact unit described above.

[0231] In the relay provided in this embodiment, the movable contact piece 22 and the pair of stationary contact leading-out terminals 21 of the contact unit are contacted with or separated from one another. When the movable contact piece 22 comes into contact with the stationary contacts at the bottom of the pair of stationary contact leading-out terminals 21, current flows in from one stationary contact leading-out terminal 21, passes through the movable contact piece 22 and then flows out of the other stationary contact leading-out terminal 21, thereby connecting the load.

[0232] In one embodiment, as shown in FIGS. 35-37, the relay further includes a push assembly 4, which includes a push rod unit 41, an elastic member 43 and a U-shaped bracket 42. The push rod unit 41 includes a base 413 and a push rod 411, and the base 413 and an upper part of the push rod 411 may be integrally injection-molded. The U-shaped bracket 42 and the base 413 enclose a frame structure, the movable contact piece 22 and the elastic member 43 are mounted within the frame structure enclosed by the U-shaped bracket 42 and the base 413. One end of the elastic member 43 abuts against the base 413, and the other end of the elastic member 43 abuts against the movable contact piece 22. The elastic member 43 may provide an elastic force, so that the movable contact piece 22 has a tendency to move away from the base 413 and approach the stationary contact leading-out terminal 21.

[0233] Specifically, the push rod unit 41 and the U-shaped bracket 42 are matched through the limiting protrusion 412 and the limiting hole 421. A moving force of the push rod unit 41 may be transmitted to the U-shaped bracket 42 for driving the movement of the movable contact piece 22, so that the movable contact piece 22 can be contacted with or separated from the pair of stationary contact leading-out terminals 21.

[0234] The push assembly 4 of the relay further includes an electromagnet unit 44 (as shown in FIGS. 23-24), which is disposed on a side of a yoke plate facing away from the insulating cover 11. The push rod unit 41 is drivenly connected to the electromagnet unit 44, and the push rod unit 41 is movably disposed in a driving chamber enclosed by a metal cover and the yoke plate, and abuts against the movable contact piece 22 through a via hole of the yoke plate. When the electromagnet unit 44 is energized, the push rod unit 41 may be driven to move, to further drive the movable contact piece 22 to move, so as to contact with or separate from the stationary contact leading-out terminal 21.

[0235] The electromagnet unit 44 includes a coil bobbin 441, a coil 442, a stationary core 444, a movable core 443, a U-shaped yoke 445, a magnetic sleeve 446 and a spring 447. The coil bobbin 441 is disposed within the U-shaped yoke 445, the coil bobbin 441 is in a hollow cylindrical shape and made of an insulating material. The magnetic sleeve 446 penetrates through and is disposed within the coil bobbin 441, and the coil 442 is wound around the coil bobbin 441. The stationary core 444 is provided with a second perforation that is arranged corresponding to the via hole of the yoke plate, through which the push rod unit 41 may pass. The movable core 443 is movably disposed within the magnetic sleeve 446 and arranged opposite to the stationary core 444. The spring 447 is disposed between the stationary core 444 and the movable core 443 and is capable of abutting against each of them. The movable core 443 is connected to the push rod unit 41 and configured to be attracted by the stationary core 444 when the coil 442 is energized. The movable core 443 and the push rod unit 41 may be connected by screwing, riveting, welding or other means.

[0236] The working process of the relay provided in this embodiment is as follows:

[0237] When the coil 442 is energized, the stationary core 444 attracts the movable core 443, the movable core 443 drives the push rod unit 41 to move upward, the spring 447 between the stationary core 444 and the movable core 443 is compressed, and the push rod unit 41 pushes the movable contact piece 22 to move by means of the U-shaped bracket 42 and the elastic member 43, so that the two ends of the movable contact piece 22 are respectively in contact with the two stationary contact leading-out terminals 21, to close the movable and stationary contacts.

[0238] When the current of the coil 442 is interrupted, the stationary core 444 releases the attraction to the movable core 443. Under the elastic force of the compressed spring 447, the movable core 443 drives the push rod unit 41 to move downward, so that the movable contacts at the two ends of the movable contact piece 22 are separated from the two stationary contact leading-out terminals 21, to separate the movable and stationary contacts.

[0239] When the short-circuit load is large, under the action of the short-circuit current, an electro-dynamic repulsive force may be generated between the movable contact piece 22 and the stationary contact leading-out terminal 21, causing the contacts to bounce open, resulting in arc generation between the contacts and severe combustion thereof, and even causing an explosion.

[0240] For this purpose, the relay provided in this embodiment further includes a short-circuit resistant assembly 3 (as shown in FIGS. 23-24), which is disposed at least on the upper side of the movable contact piece 22 along an axial direction of the stationary contact leading-out terminal 21, and generates an attractive force when a fault high current occurs in the movable contact piece 22, to resist the electro-dynamic repulsive force between the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0241] The short-circuit resistant assembly 3 may also be a short-circuit ring disposed between the pair of stationary contact leading-out terminals 21. For a high-voltage DC relay, the first arc barrier 7 may prevent the arc from being attracted by the short-circuit resistant assembly 3 to move toward the direction in which the pair of stationary contact leading-out terminals 21 face each other, thus avoiding the reduction of insulation between the contacts or arc short-circuit.

[0242] Specifically, a thrust part 221 of the movable contact piece 22 is disposed between two contact parts. The short-circuit resistant assembly 3 is disposed on the thrust part 221 of the movable contact piece 22. Both sides of the thrust part 221 are plane structures. The plane on the both sides of the thrust part 221 provides mounting convenience and reliability for the short-circuit resistant assembly 3. The short-circuit resistant assembly 3 is configured to resist the electro-dynamic repulsive force between the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0243] In one embodiment, the short-circuit resistant assembly 3 includes an upper magnetic conductor 31 and a lower magnetic conductor 32. The upper magnetic conductor 31 is disposed at the side of the movable contact piece 22 facing the stationary contact leading-out terminal 21. The lower magnetic conductor 32 is at least partially disposed at the side of the movable contact piece 22 facing away from the stationary contact leading-out terminal 21 to form a magnetic conductive circuit between the upper magnetic conductor 31 and the lower magnetic conductor 32. The upper magnetic conductor 31 and the lower magnetic conductor 32 may be made of materials such as iron, cobalt, nickel and their alloys.

[0244] The upper magnetic conductor 31 is disposed at the side of the thrust part 221 facing the stationary contact leading-out terminal 21, and the lower magnetic conductor 32 is disposed at the side of the thrust part 221 facing away from the stationary contact leading-out terminal 21, that is, the lower magnetic conductor 32 is fixed below the thrust part 221 of the movable contact piece 22. The magnetic conductive circuit may be formed between the upper magnetic conductor 31 and the lower magnetic conductor 32, and the lower magnetic conductor 32 may move together with the movable contact piece 22 in the direction close to the stationary contact leading-out terminal 21. When a high fault current occurs in the movable contact piece 22, since the upper magnetic conductor 31 is located above the movable contact piece 22 and the lower magnetic conductor 32 is located below the movable contact piece 22, the movable contact piece 22 is clamped between the upper magnetic conductor 31 and the lower magnetic conductor 32. When the upper magnetic conductor 31 generates an attractive force on the lower magnetic conductor 32, the attractive force functions to attract and pull the movable contact piece 22 and resist the electro-dynamic repulsive force generated by the fault current between the movable contact piece 22 and the stationary contact leading-out terminal 21, to avoid the occurrence of arc pulling and explosion caused by the mutual separation between the movable contact piece 22 and the stationary contact leading-out terminal 21, and ensure the reliability and safety of the contact between the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0245] In one embodiment, the upper magnetic conductor 31 may be a linear structure, the upper magnetic conductor 31 is disposed at a position corresponding to a portion between the two contact parts of the movable contact piece 22. The upper magnetic conductor 31 may extend along the width direction of the movable contact piece 22 for the matching and correspondence of the upper magnetic conductor 31 and the lower magnetic conductor 32. The lower magnetic conductor 32 is a U-shaped structure, and the opening of the lower magnetic conductor 32 is disposed facing the movable contact piece 22, so that the two side arms of the lower magnetic conductor 32 extend toward the upper magnetic conductor 31, thus the two side arms of the lower magnetic conductor 32 may be close to or in contact with the two ends of the upper magnetic conductor 31 respectively to form a surrounding magnetic ring along the width of the movable contact piece 22. Since the contact parts at the two ends of the movable contact piece 22 along its length direction are movable contacts, the surrounding magnetic ring formed along the width direction of the movable contact piece 22 may not cause interference, and when a high fault current occurs in the movable contact piece 22, an electro-dynamic attractive force in the direction of the movable contact pressure is generated to resist the electro-dynamic repulsive force generated by the fault current between the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0246] It should be specially noted that the U-shaped bracket 42 may be fixedly connected to the upper magnetic conductor 31, the lower magnetic conductor 32 is connected to the bottom of the movable contact piece 22. The movable contact piece 22 and the lower magnetic conductor 32 form a movable member. The short-circuit resistant assembly 3 and the movable contact piece 22 are disposed between the U-shaped bracket 42 and the push rod unit 41.

[0247] In one embodiment, as shown in FIG. 32, the relay further includes an arc extinguishing unit 5, which is disposed within a hollow chamber of the housing and configured to extinguish the arc of the contact assembly 2. The arc extinguishing unit 5 includes two arc extinguishing magnets 51. The arc extinguishing magnets 51 may be permanent magnets, and each arc extinguishing magnet 51 may substantially be a cuboid. The two arc extinguishing magnets 51 are respectively disposed on both sides of the insulating cover 11 and oppositely arranged along the length direction of the movable contact piece 22.

[0248] In this embodiment, the two arc extinguishing magnets 51 are respectively located on the left and right sides of the insulating cover 11. The surfaces facing to one another of the two arc extinguishing magnets 51 have opposite polarities. That is to say, a left surface of the arc extinguishing magnet 51 on the left side of the insulating cover 11 is an S pole and a right surface thereof is an N pole, and the left surface of the arc extinguishing magnet 51 on the right side of the insulating cover 11 is an S pole and the right surface thereof is an N pole.

[0249] Certainly, the surfaces facing to one another of the two arc extinguishing magnets 51 may also be designed to have the same polarity. For example, the left surface of the arc extinguishing magnet 51 on the left side of the insulating cover 11 is an S pole and the right surface thereof is an N pole, and the left surface of the arc extinguishing magnet 51 on the right side of the insulating cover 11 is an N pole and the right surface thereof is an S pole.

[0250] In this way, by arranging two oppositely disposed arc extinguishing magnets 51, a magnetic field may be formed around the contact assembly 2.

[0251] Therefore, the arc generated between the stationary contact leading-out terminal 21 and the movable contact piece 22 may be elongated in the direction away from each other under the action of the magnetic field, thereby realizing arc extinguishing.

[0252] The arc extinguishing unit 5 further includes two yoke clamps 52, which are arranged in positions corresponding to the two arc extinguishing magnets 51. Moreover, the two yoke clamps 52 surround the insulating cover 11 and the two arc extinguishing magnets 51. The design of the yoke clamps 52 surrounding the arc extinguishing magnets 51 can prevent the magnetic field generated by the arc extinguishing magnets 51 from diffusing outward and affecting the arc extinguishing effect. The yoke clamps 52 are made of soft magnetic materials. The soft magnetic materials may include but are not limited to iron, cobalt, nickel and the alloys thereof, etc.Fifth Embodiment

[0253] This embodiment is similar to the fourth embodiment, with the only difference in the structure of the first arc barrier groove 222.

[0254] As shown in FIGS. 38-40, the first arc barrier groove 222 provided in this embodiment has at least one of a linear structure, a convex structure and an X-shaped structure.

[0255] Specifically, as shown in FIG. 38, the first arc barrier groove 222 is of a linear structure with a simple structure and convenient production and processing. Moreover, since a width of the first arc barrier groove 222 along the length direction of the movable contact piece 22 is relatively narrow, the overall structural strength of the movable contact piece 22 is relatively high.

[0256] As shown in FIG. 39, the first arc barrier groove 222 has a convex structure, so that the first arc barrier groove 222 has a broken-line groove structure, which increases the tortuosity of the transfer path of the arc, thereby improving the arc extinguishing effect.

[0257] As shown in FIG. 40, the first arc barrier groove 222 has an X-shaped structure. The X-shaped structure includes two intersecting slots, so that the arc on each side can be blocked by the transfer path through the two slots, playing a dual arc isolation role with good isolation and arc extinguishing effects.

[0258] It can be understood that the two first arc barrier grooves 222 in this embodiment may have the same or different shapes. For example, one of the first arc barrier grooves 222 has a convex structure, and the other of the first arc barrier grooves 222 has a linear structure.

[0259] It can be understood that the first arc barrier groove 222 provided in this embodiment includes but is not limited to the linear structure and the X-shaped structure, and may also have an S-shaped structure, a tapered structure, etc. Its specific shape can be adjusted according to actual production conditions.

[0260] It should be particularly noted that, as shown in FIGS. 41-43, the first arc barrier groove 222 may be replaced by an arc barrier rib 225, and the arrangement position and shape of the arc barrier rib 225 are similar to those of the first arc barrier groove 222, which will not be repeated.Sixth Embodiment

[0261] This embodiment is similar to the fourth embodiment, with the only difference in the quantity and structure of the arc barrier portions.

[0262] As shown in FIGS. 44-45, the number of the arc barrier portions provided in this embodiment is one. The portions of the movable contact piece 22, which are not provided with the arc barrier portions, and the portions on both sides of the movable contact piece 22 along the length direction are in contact with the pair of stationary contact leading-out terminals 21, respectively.

[0263] When the arc barrier portion is the first arc barrier groove 222, since one first arc barrier groove 222 is disposed between the pair of stationary contact leading-out terminals 21, and the width of the first arc barrier groove 222 along the length direction of the movable contact piece 22 is relatively wide, the portions of the movable contact piece 22, which are not provided with the first arc barrier groove 222 and disposed on both ends along the length direction of the movable contact piece 22 are respectively two contact parts. The two contact parts are correspondingly in contact with the pair of stationary contact leading-out terminals 21. The arc isolation process for the two sets of movable and stationary contacts can be realized by using one first arc barrier groove 222, which has a simple structure and relatively low production cost.

[0264] In one embodiment, a distance between the two side edges of the first arc barrier groove 222 along the length direction of the movable contact piece 22 is less than or equal to a distance between the bottoms of the pair of stationary contact leading-out terminals 21.

[0265] Specifically, the width of the first arc barrier groove 222 along the length direction of the movable contact piece 22 extends to a vicinity of the inner side edges of the bottoms of the stationary contact leading-out terminals 21 or is flush with the inner side edges of the bottoms of the stationary contact leading-out terminals 21, so that the edge between the first groove wall of the first arc barrier groove 222 and the top surface of the movable contact piece 22 is as close as possible to the bottoms of the stationary contact leading-out terminals 21. The arc can be concentrated at the edge as soon as possible, and the drop between the top surface of the movable contact piece 22 and the first groove bottom of the first arc barrier groove 222 is utilized to reduce the risk of the arc transferring toward the center line of the movable contact piece 22.

[0266] It should be particularly noted that, as shown in FIG. 45, the first arc barrier groove 222 may be replaced by the arc barrier rib 225, and the arrangement position and shape of the arc barrier rib 225 are similar to those of the first arc barrier groove 222, which will not be repeated.Sixth Embodiment

[0267] This embodiment is similar to the fourth embodiment and the fifth embodiment, with the difference in that other detailed structures of the movable contact piece 22 are added on the basis of the fourth embodiment or the fifth embodiment.

[0268] In the movable contact piece 22 provided in this embodiment, a second arc barrier groove (not shown) may also be provided on the side walls of the movable contact piece 22, and the second arc barrier grooves are configured to impede the movement of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other.

[0269] This embodiment provides a movable contact piece 22. The second arc barrier grooves are disposed on the side walls of the movable contact piece 22 to impede the arc transfer along the side walls of the movable contact piece 22 toward the center line of the movable contact piece 22 in the length direction, thereby isolating and cutting off the transfer path of the arc on the side walls of the movable contact piece 22, avoiding the arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, enabling the arc to be extinguished efficiently along the originally set arc extinguishing path of the magnetic blow-out field, and improving the arc extinguishing capability.

[0270] In one embodiment, the second arc barrier grooves are disposed between the inner edges of the two first contact parts 220.

[0271] In other words, the second arc barrier grooves are disposed on the inner side of the stationary contact leading-out terminals 21, to cut off the transfer path of the arc toward the inner side of the stationary contact leading-out terminals 21, avoid the arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, and ensure the high efficiency and thoroughness of arc extinguishing.

[0272] In one embodiment, the number of the second arc barrier grooves is multiple, and the multiple second arc barrier grooves are disposed on both sides of the movable contact piece 22 along the length direction of the movable contact piece 22; and / or, the number of the second arc barrier grooves is multiple, and the multiple second arc barrier grooves are disposed on both sides of the movable contact piece 22 along the width direction of the movable contact piece 22.

[0273] For example, the number of the second arc barrier grooves is four, with two second arc barrier grooves provided on each side of the movable contact piece 22 along its length direction, and two second arc barrier grooves provided on each side of the movable contact piece 22 along its width direction. The four second arc barrier grooves are disposed at four corners of the thrust part 221 of the movable contact piece 22, so that the arc may be isolated by the second arc barrier grooves no matter in which directions the arc transfers along the side walls of the movable contact piece 22, which can improve the arc isolation effect.

[0274] In one embodiment, the second arc barrier groove includes a second groove wall and a second groove bottom that are connected to each other. The arc moves to the connection between the second groove wall and the side wall of the movable contact piece 22 to form an arc concentration. A height difference between the side wall of the movable contact piece 22 and the second groove bottom is used to impede the movement of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other.

[0275] Since the second arc barrier groove has the second groove wall and the second groove bottom connected with each other, the connection between the second groove wall and the side wall of the movable contact piece 22 is an edge. The arc moves to the edge to form an arc concentration. The height difference between the side wall of the movable contact piece 22 and the second groove bottom creates a drop on the arc transfer path along the side wall of the movable contact piece 22, which can prevent the arc from easily moving toward the center line of the movable contact piece 22 in the length direction, and the combination of the edge and the drop can improve the arc extinguishing effect.

[0276] In one embodiment, the second arc barrier groove is a through groove extending along the axial direction of the stationary contact leading-out terminal 21.

[0277] If the second arc barrier groove extends along the length direction of the movable contact piece 22, the arc can transfer along the part of the side wall of the movable contact piece 22 where the second arc barrier groove is not provided, resulting in a risk of arc short-circuit. Therefore, the second arc barrier groove is configured as a through groove extending along an axial direction of the stationary contact leading-out terminal 21. Since the through groove is arranged to penetrate a height direction of the movable contact piece 22, after the arc enters the second arc barrier groove, the transfer path of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other is completely cut off.

[0278] Furthermore, the present disclosure also provides a relay contact assembly and a relay with reliable arc interruption and good safety performance.

[0279] According to a first aspect of the present disclosure, there is provided a relay contact assembly, including: a pair of stationary contact leading-out terminals; a movable contact piece configured to be contacted with or separated from the pair of stationary contact leading-out terminals; a first arc barrier disposed outside the stationary contact leading-out terminals and configured to impede arc transfer; and a second arc barrier mounted on the movable contact piece and configured to impede the arc transfer.

[0280] In some implementations, the first arc barrier is sleeved outside the stationary contact leading-out terminals; and / or, the second arc barrier is sleeved on an outer wall of the movable contact piece.

[0281] In some implementations, a first step and / or a first gap is disposed between the first arc barrier and the stationary contact leading-out terminal and configured to impede the arc transfer.

[0282] In some implementations, the first arc barrier protrudes from an outer peripheral wall of the stationary contact leading-out terminal, and the first step is formed between a bottom wall at one end of the first arc barrier facing the movable contact piece and an outer peripheral wall of the corresponding stationary contact leading-out terminal.

[0283] In some implementations, the first gap is disposed between an inner wall of a bottom at one end of the first arc barrier facing the movable contact piece and an outer peripheral wall of the stationary contact leading-out terminal.

[0284] In some implementations, one of an inner wall of the first arc barrier and an outer wall of the stationary contact leading-out terminal is provided with a limiting part, the other of the inner wall of the first arc barrier and the outer wall of the stationary contact leading-out terminal is provided with a fitting part, and the limiting part is engaged with the fitting part.

[0285] In some implementations, a stationary contact is disposed at a bottom of the stationary contact leading-out terminal, and an outer peripheral wall of the first arc barrier protrudes from an outer peripheral wall of the stationary contact; the stationary contact leading-out terminal and the stationary contact are of an integrally formed structure or a separately formed structure.

[0286] In some implementations, one end of the first gap facing the movable contact piece is provided with an open end, and one end of the first gap away from the movable contact piece is provided with a closed end.

[0287] In some implementations, the first gap is disposed between an inner peripheral wall of a bottom of the first arc barrier and an outer peripheral wall of a bottom of the stationary contact leading-out terminal.

[0288] In some implementations, a portion of the movable contact piece in contact with the pair of stationary contact leading-out terminals is a first contact part, and the first step and / or the first gap is at least partially disposed between inner edges of the first contact part.

[0289] In some implementations, a second step is disposed between the second arc barrier and the movable contact piece and configured to impede the arc transfer; and / or, a second gap is disposed between the second arc barrier and the movable contact piece and configured to impede the arc transfer.

[0290] In some implementations, a portion of the movable contact piece in contact with the pair of stationary contact leading-out terminals is a first contact part, and the second step and / or the second gap is disposed between inner edges of the first contact part.

[0291] In some implementations, the second arc barrier includes a column, a top surface at one end of the column facing the stationary contact leading-out terminal protrudes from a top surface at one end of the movable contact piece facing the stationary contact leading-out terminal, so that the second step is formed between the top surface of the column and the top surface of the movable contact piece.

[0292] In some implementations, a mounting groove is disposed on a side wall of the movable contact piece, the column is at least partially disposed within the mounting groove, and the second gap is disposed between the column and the mounting groove.

[0293] In some implementations, the second gap is disposed along an axial direction of the column.

[0294] In some implementations, one end of the second gap facing the stationary contact leading-out terminal is provided with an open end, and one end of the second gap facing away from the stationary contact leading-out terminal is provided with a closed end.

[0295] In some implementations, the mounting groove includes a first mounting portion, the first mounting portion is disposed at one side of the movable contact piece facing the stationary contact leading-out terminal, the column is inserted into the first mounting portion, and the second gap is disposed between the column and the first mounting portion.

[0296] In some implementations, the second gap is of a horn-shaped structure, and a large opening end of the second gap is disposed facing the stationary contact leading-out terminal.

[0297] In some implementations, the mounting groove further includes a fixing portion, the fixing portion is in communication with the first mounting portion, and the column is engaged with the fixing portion to fix the second arc barrier.

[0298] In some implementations, the mounting groove further includes a second mounting portion, the second mounting portion is disposed at one side of the movable contact piece away from the stationary contact leading-out terminal, the second mounting portion is in communication with the first mounting portion through the fixing portion, the column is inserted into the second mounting portion, and a second guiding gap is disposed between an outer wall of the column and an inner wall of the second mounting portion and is configured to guide the column.

[0299] In some implementations, a number of each of the columns and the mounting grooves is two, the two mounting grooves are disposed at two sides of the movable contact piece along a width direction of the movable contact piece and disposed between inner edges of the two first contact parts, and the two columns are disposed corresponding to the two mounting grooves.

[0300] In some implementations, the second arc barrier further includes a limiting part, the limiting part is disposed at one side of the column away from the movable contact piece and is capable of abutting against the movable contact piece to limit the column.

[0301] In some implementations, the second arc barrier further includes an arc barrier ring, and the arc barrier ring wraps an end of the movable contact piece along a length direction of the movable contact piece and at least a part of side walls of the movable contact piece, to impede the arc transfer.

[0302] In some implementations, the second arc barrier further includes a connecting part, the connecting part is disposed at a bottom of one end of the movable contact piece away from the stationary contact leading-out terminal and connected to two ends of the arc barrier ring respectively, and the column is disposed to the connecting part.

[0303] In some implementations, a number of the second arc barriers is two, and the two second arc barriers are disposed at two ends of the movable contact piece along a length direction of the movable contact piece respectively.

[0304] In some implementations, both the first arc barrier and the second arc barrier are made of an insulating material.

[0305] In some implementations, one side of the movable contact piece facing the stationary contact leading-out terminal is provided with an arc barrier part, and the arc barrier part is configured to impede an arc from moving along a top surface at one side of the movable contact piece facing the stationary contact leading-out terminals and toward a direction where the pair of stationary contact leading-out terminals face each other.

[0306] In some implementations, the arc barrier part is a first arc barrier groove; and / or, the arc barrier part is an arc barrier rib.

[0307] In some implementations, a portion of the movable contact piece in contact with the pair of stationary contact leading-out terminals is a first contact part, and the arc barrier part is disposed between inner edges of the first contact part.

[0308] According to a second aspect of the present disclosure, a relay of the embodiments of the present disclosure includes the relay contact assembly as above described.

[0309] In some implementations, the relay further includes a short-circuit resistant assembly, the short-circuit resistant assembly is disposed at least on one side of the movable contact piece facing the stationary contact leading-out terminal, and is configured to resist an electro-dynamic repulsive force between the movable contact piece and the stationary contact leading-out terminal by generating a suction force when a high fault current occurs in the movable contact piece.

[0310] One embodiment of the present disclosure has following advantages or beneficial effects: In the relay contact assembly and the relay provided by the embodiments of the present disclosure, the movable contact piece is contacted with or separated from a pair of stationary contact leading-out terminals; when the movable contact piece is in contact with the stationary contacts at the bottoms of the pair of stationary contact leading-out terminals, current flows in from one stationary contact leading-out terminal and flows out from the other stationary contact leading-out terminal after passing through the movable contact piece, thereby achieving load connection. When the movable contact piece is separated from the stationary contacts at the bottoms of the pair of stationary contact leading-out terminals, the contacts break under load, and an arc is generated between the contacts. When the arc moves up and down along the outer wall of the stationary contact leading-out terminal under the action of a magnetic field, the first arc barrier is disposed on the outer wall of the stationary contact leading-out terminal, which can block the transfer of the arc and reduce the ablation on the peripheral side wall of the stationary contact leading-out terminal caused by the arc. Meanwhile, the second arc barrier is mounted on the movable contact piece, and the second arc barrier is close to the arc initiation point, which can impede the arc transfer better. It can further prevent the arc from being attracted by the short-circuit ring so that the arcs are attracted toward each other between the contacts, and prevent the insulation between the contacts from decreasing or the arc from short-circuiting.

[0311] Under the combined action of the first arc barrier and the second arc barrier, a transfer range of the arc is limited between the movable contact piece and the stationary contact leading-out terminals, arc isolation can be achieved more comprehensively, the transfer of the arc can be impeded, and the arc extinguishing performance can be improved.

[0312] Hereinafter, example embodiments will be described more fully with reference to the accompanying drawings.Seventh Embodiment

[0313] The present embodiment provides a relay contact assembly 2. As shown in FIGS. 46-48, the relay contact assembly 2 includes a movable contact piece 22 and a pair of stationary contact leading-out terminals 21. The movable contact piece 22 is configured to contact with or separate from the pair of stationary contact leading-out terminals 21.

[0314] In the relay contact assembly 2 provided by the present embodiment, the movable contact piece 22 is contacted with or separated from the pair of stationary contact leading-out terminals 21. When the movable contact piece 22 comes into contact with stationary contacts at the bottom of the pair of stationary contact leading-out terminals 21, current flows in from one stationary contact leading-out terminal 21, passes through the movable contact piece 22 and then flows out of the other stationary contact leading-out terminal 21, thereby realizing load connection.

[0315] In one embodiment, a stationary contact is disposed at the bottom of the stationary contact leading-out terminal 21. The stationary contact leading-out terminal 21 and the stationary contact are of an integrally formed structure or a separately formed structure.

[0316] Specifically, the bottom of the stationary contact leading-out terminal 21 may serve directly as the stationary contact, or the stationary contact may be disposed at the bottom of the stationary contact leading-out terminal 21 integrally or separately.

[0317] When the movable contact piece 22 is separated from the stationary contacts at the bottom of the pair of stationary contact leading-out terminals 21, along with the separation of the movable and stationary contacts between the movable contact piece 22 and the stationary contact leading-out terminals 21 and a magnetic blow arc-pulling, if the arc is pulled to a certain extent, the arc will be extinguished automatically; if the arc is not stable enough at the movable and stationary contacts and transfers on the surface of the movable contact piece 22 or the stationary contact, the arc cannot be extinguished mainly along the magnetic blow-out arc pulling path, eventually resulting in failure to break the arc and even explosion and burnout of the relay.

[0318] In order to solve this problem, as shown in FIGS. 46-48, the relay contact assembly 2 provided in this embodiment further includes a first arc barrier 6 and a second arc barrier 8, and the first arc barrier 6 is disposed outside the stationary contact leading-out terminal 21 and configured to impede arc transfer. The second arc barrier 8 is mounted on the movable contact piece 22 and configured to impede the arc transfer.

[0319] In the relay contact assembly 2 provided in this embodiment, when an arc moves up and down along the outer wall of the stationary contact leading-out terminal 21 under the action of a magnetic field, the first arc barrier 6 is disposed outside the stationary contact leading-out terminal 21, and under the action of the first arc barrier 6, the risk of ablation on the peripheral side wall of the stationary contact leading-out terminal 21 caused by the arc can be reduced. The second arc barrier 8 is mounted on the movable contact piece 22, and the second arc barrier 8 is closer to the arc initiation point, which can impede the transfer of the arc better.

[0320] In one embodiment, the first arc barrier 6 is made of an insulating material.

[0321] Specifically, the first arc barrier 6 may be made of insulating materials such as ceramics, glass, rubber or plastic, and the first arc barrier 6 made of an insulating material has good arc breaking or arc cooling performance, with strong arc extinguishing capacity and good arc extinguishing effect.

[0322] It can be understood that in some other embodiments, the first arc barrier 6 may also be made of a metal material.

[0323] In one embodiment, as shown in FIG. 49 to FIG. 50, the first arc barrier 6 is disposed within the insulating cover 11 and sleeved outside the stationary contact leading-out terminal 21.

[0324] The first arc barrier 6 may also be an arc barrier sleeve, and the first arc barrier 6 is sleeved on the stationary contact leading-out terminal 21 to perform arc isolation treatment on the outer peripheral side of the contact area corresponding to the stationary contact of the stationary contact leading-out terminal 21, which can achieve more comprehensive arc isolation and facilitate arc extinguishing.

[0325] It should be particularly noted that, the first arc barrier 6 is sleeved on the stationary contact leading-out terminal 21, and the first arc barrier 6 includes but not limited to a cylindrical shape, an elliptical cylindrical shape, a square cylindrical shape, a polygonal cylindrical shape and the like.

[0326] In one embodiment, the first arc barrier 6 is a closed ring structure annularly disposed on the stationary contact leading-out terminal 21; or, the first arc barrier 6 is annularly and spacedly distributed around the stationary contact leading-out terminal 21.

[0327] In addition, the first arc barrier 6 may be of an integrally formed structure, for example, the first arc barrier 6 is in an integral cylindrical shape or an annular shape, sleeved outside the stationary contact leading-out terminal 21. The use of the integrally formed structure reduces the links of part assembly and results in relatively low production cost.

[0328] Specifically, the first arc barrier 6 may also be of a separately formed structure, the first arc barrier 6 includes a plurality of insulating monomers. The plurality of insulating monomers are disposed along a circumferential direction of the stationary contact leading-out terminal 21 and may be connected end to end to a cylindrical shape, a polygonal cylindrical shape and other structures. In some other embodiments, the plurality of insulating monomers may also be distributed annularly and at intervals around the outer side of the stationary contact leading-out terminal 21, or a single insulating monomer may be disposed outside the stationary contact leading-out terminal 21. This embodiment is not limited thereto as long as the insulating and arc extinguishing effects can be achieved.

[0329] In one embodiment, as shown in FIG. 50 to FIG. 52, a first step 61 and / or a first gap 60 is disposed between the first arc barrier 6 and the stationary contact leading-out terminal 21, and is configured to impede the arc from transferring along the outer wall of the stationary contact leading-out terminal 21 and toward a direction away from the movable contact piece 22.

[0330] The first step 61 and / or the first gap 60 is provided at a position where the first arc barrier 6 is in contact with the stationary contact leading-out terminals 21 and disposed on a moving path of the arc, that is, a bend is formed on the arc path, which can consume the kinetic energy of the arc and better block the arc transfer. The arc has two transfer directions: first, the first step 61 and / or the first gap 60 can block the arc from transferring toward the direction in which the pair of stationary contact leading-out terminals 21 face each other, to avoid the occurrence of arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21; second, the first step 61 and / or the first gap 60 can block the arc from transferring upward toward a direction away from the movable contact piece 22 along the outer wall of the stationary contact leading-out terminals 21, further reduce the ablation of the outer wall of the stationary contact leading-out terminals 21 by the arc, improve the arc extinguishing capability and effect, and thus improve the interruption capability between the movable contact and the stationary contact corresponding to the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0331] In one embodiment, as shown in FIG. 52, the outer peripheral wall of the first arc barrier 6 protrudes from the outer peripheral wall of the stationary contact leading-out terminal 21, and a first step 61 is formed between the bottom wall of the first arc barrier 6 and the outer peripheral wall of the corresponding stationary contact leading-out terminal 21.

[0332] The outer peripheral wall of the first arc barrier 6 and the outer peripheral wall of the stationary contact leading-out terminal 21 are not disposed coplanarly, or the first arc barrier 6 is not embedded in the outer peripheral wall of the stationary contact leading-out terminal 21, such that the first step 61 is formed between the bottom wall of the first arc barrier 6 and the outer peripheral wall of the corresponding stationary contact leading-out terminal 21. The first step 61 is closer to the arc initiation point and restricts the arc from moving upward along the surface of the stationary contact leading-out terminal 21, thereby reducing the ablation on the outer peripheral wall of the stationary contact leading-out terminal 21 and the ablation in the direction away from the movable contact piece 22, so as to achieve the purpose of consuming the energy of the arc.

[0333] The outer peripheral wall of the first arc barrier 6 protrudes from the outer peripheral wall of the stationary contact.

[0334] The outer peripheral wall of the first arc barrier 6 and the outer peripheral wall of the stationary contact are not disposed coplanarly, and the stationary contact is located below the first arc barrier 6, such that the first step 61 is formed between the bottom wall of the first arc barrier 6 and the outer peripheral wall of the corresponding stationary contact. The first step 61 is closer to the arc initiation point, thereby reducing the ablation on the outer peripheral wall of the stationary contact leading-out terminal 21 by the arc and the ablation in the direction away from the movable contact piece 22, and realizing the protection of the stationary contact leading-out terminal 21.

[0335] In one embodiment, as shown in FIG. 52, the first gap 60 is disposed between the inner wall of the bottom of the first arc barrier 6 and the outer wall of the stationary contact leading-out terminal 21. Specifically, the first gap 60 is disposed between the inner peripheral wall of the bottom of the first arc barrier 6 and the outer peripheral wall of the bottom of the stationary contact leading-out terminal 21.

[0336] The connection between the bottom end face and the inner wall face of the first arc barrier 6 is an edge, and the arc moves to the edge to form an arc concentration. Meanwhile, due to the existence of the first gap 60, a part of the arc may enter the first gap 60, resulting in a height drop in the arc transfer path. The drop makes it difficult for the arc to move further in the direction away from the movable contact piece 22. The combination of the edge and the drop is used to impede arc transfer.

[0337] In one embodiment, one end of the first gap 60 facing the movable contact piece 22 is provided with an open end, and one end of the first gap 60 away from the movable contact piece 22 is a closed end.

[0338] The open end of the first gap 60 is used for introducing the arc, and the first gap 60 is provided with the closed end, such that the first gap 60 is not a fully through structure, thereby a bend can be formed in the arc path.

[0339] It should be particularly noted that the arc barrier structure provided in this embodiment may include the first arc barrier 6, the first step 61 and the first gap 60. The first step 61 and the first gap 60 form a partial arc barrier structure, which is configured to restrict the arc from transferring along the stationary contact leading-out terminal 21 toward the direction away from the movable contact piece 22 and also restrict the arc from transferring toward the central line of the movable contact piece 22. The first arc barrier 6 made of an insulating material has the performance of arc breaking or arc cooling, so as to achieve the effect of arc extinguishing.

[0340] In one embodiment, as shown in FIG. 52, one of the inner wall of the first arc barrier 6 and the outer wall of the stationary contact leading-out terminal 21 is provided with a positioning part 62, the other of the inner wall of the first arc barrier 6 and the outer wall of the stationary contact leading-out terminal 21 is provided with an fitting part 211, and the positioning part 62 is engaged with the fitting part 211.

[0341] When the first arc barrier 6 is mounted on the stationary contact leading-out terminal 21, the positioning part 62 and the fitting part 211 may perform initial positioning on the first arc barrier 6, improving the mounting accuracy of the first arc barrier 6. Meanwhile, the positioning part 62 is engaged with the fitting part 211 to fix the first arc barrier 6 and prevent the first arc barrier 6 from falling off.

[0342] The positioning part 62 and the fitting part 211 may be a stop step, an annular positioning groove or a positioning protrusion disposed on the stationary contact leading-out terminal 21, for example: the positioning part 62 is an annular clamping block disposed on the inner wall of the first arc barrier 6, the fitting part 211 is an annular clamping groove disposed on the outer wall of the stationary contact leading-out terminal 21, and the annular clamping block is engaged with the annular clamping groove. The positioning part 62 and the fitting part 211 provided in this embodiment are not limited to other forms, and any structure that can realize the positioning and fixing of the first arc barrier 6 relative to the stationary contact leading-out terminal 21 falls within the protection scope of this embodiment.

[0343] In one embodiment, as shown in FIG. 52, a first guiding gap 63 is disposed between the inner wall of the top at one end of the first arc barrier 6 away from the movable contact piece 22 and the outer wall of the corresponding stationary contact leading-out terminal 21, and the first guiding gap 63 is configured to guide the stationary contact leading-out terminal 21.

[0344] Since the first arc barrier 6 needs to be sleeved on the outer wall of the stationary contact leading-out terminal 21 from the bottom of the stationary contact leading-out terminal 21 when the first arc barrier 6 is mounted on the stationary contact leading-out terminal 21, the inner wall of the top of the first arc barrier 6 and the outer wall of the stationary contact leading-out terminal 21 are not attached to each other. A first guiding gap 63 is disposed between the inner wall of the top of the first arc barrier 6 and the outer wall of the stationary contact leading-out terminal 21, and the first guiding gap 63 is configured to provide a guiding effect for the first arc barrier 6, facilitating the mounting of the first arc barrier 6.

[0345] It can be understood that the first guiding gap 63 may be of a horn-shaped structure, the large opening end of the first gap 60 is disposed facing away from the movable contact piece 22, and the large opening end of the first gap 60 serves as an inlet for the bottom of the stationary contact leading-out terminal 21 to pass through, further improving the mounting convenience of the first arc barrier 6.

[0346] In one embodiment, as shown in FIG. 53, the second arc barrier 8 is made of an insulating material.

[0347] Specifically, the second arc barrier 8 may be made of insulating materials such as ceramics, glass, rubber or plastic. The second arc barrier 8 made of the insulating material has good arc extinguishing or arc cooling performance, with strong arc extinguishing capacity and good arc extinguishing effect.

[0348] It can be understood that in some other embodiments, the second arc barrier 7 may also be made of a metal material.

[0349] In one embodiment, the second arc barrier 8 is sleeved on an outer wall of the movable contact piece 22.

[0350] The second arc barrier 8 may also be an arc barrier sleeve. The second arc barrier 8 is sleeved on the outer wall of the movable contact piece 22 to perform arc isolation treatment on an outer peripheral side of a contact area corresponding to the movable contact of the movable contact piece 22, which can achieve a more comprehensive arc isolation and is conducive to arc extinguishing.

[0351] It can be understood that the number of the first arc barriers 8 is two, and the two first arc barriers 8 are respectively disposed at two ends of the movable contact piece 22 along the length direction of the movable contact piece 22.

[0352] In this way, the two sets of fixed and movable contacts between the movable contact piece 22 and the stationary contact leading-out terminal 21 correspond to the two first arc barriers 8 respectively, so that each set of fixed and movable contacts may use a corresponding second arc barrier 8 for arc isolation, which can achieve double arc extinguishing and improve the thoroughness of the arc extinguishing.

[0353] In one embodiment, as shown in FIGS. 53-59, a second step 71 is disposed between the second arc barrier 8 and the movable contact piece 22 and configured to impede the arc transfer; and / or, a second gap 72 is disposed between the second arc barrier 8 and the movable contact piece 22 and configured to impede the arc transfer.

[0354] A second step 71 and / or a second gap 72 is disposed at the contact position between the second arc barrier 8 and the movable contact piece 22 and on the moving path of the arc, that is, a bend is formed on the arc path, which can consume kinetic energy of the arc and block the transfer of the arc better. The arc transfer direction has two aspects: first, the second step 71 and / or the second gap 72 can block the arc from transferring toward the direction where the pair of stationary contact leading-out terminals 21 face each other, avoiding the occurrence of arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21; second, the second step 71 and / or the second gap 72 can block the arc from transferring downward along the movable contact piece 22 in the direction away from the stationary contact leading-out terminals 21, further reducing the ablation of the outer wall of the movable contact piece 22 by the arc, improving the arc extinguishing capacity and effect, and thus enhancing the interruption capacity between the movable contact and the stationary contact corresponding to the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0355] In one embodiment, portions of the movable contact pieces 22 in contact with the pair of stationary contact leading-out terminals 21 are two first contact parts 220, and the second step 71 and / or the second gap 72 is disposed between inner edges of the two first contact parts 220.

[0356] Specifically, the two first contact part 220 specifically includes two sets of movable contacts. Since the arc is generated at the portion where the movable contact piece 22 is in contact with the pair of stationary contact leading-out terminals 21, the second step 71 and / or the second gap 72 is disposed between the inner edges of the two first contact parts 220, and the second step 71 and / or the second gap 72 can cut off the path of the arc transferring to the inner side, avoiding the occurrence of arc short-circuit between the two sets of movable and stationary contacts.

[0357] In one embodiment, as shown in FIGS. 53-59, the second arc barrier 8 includes a column 70. A top surface at one end of the column 70 facing the stationary contact leading-out terminal 21 extends beyond a top surface at one end of the movable contact piece 22 facing the stationary contact leading-out terminal 21, so that a second step 71 is formed between the top surface of the column 70 and the top surface of the movable contact piece 22.

[0358] Since the top surface of the column 70 in the second arc barrier 8 extends beyond the top surface of the movable contact piece 22, the top of the column 70 and the top surface of the movable contact piece 22 are not arranged on a common plane, or the column 70 is not embedded within the top surface of the movable contact piece 22, thus the second step 71 is formed between the top surface of the movable contact piece 22 and the top of the column 70 extending beyond thereto. The second step 71 is closer to the arc initiation point, thereby isolating and cutting off a transfer path of the arc on the top surface of the movable contact piece 22 and impeding the arc from transferring to a center line of the movable contact piece 22 along the length direction, avoiding the short circuit of the arc generated by the two sets of fixed and movable contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, enabling the arc to be extinguished efficiently on the originally set arc extinguishing path of the magnetic blow-out field and improving the arc extinguishing capacity.

[0359] In one embodiment, a mounting groove 223 is disposed on the side wall of the movable contact piece 22, the column 70 is at least partially disposed within the mounting groove 223, and a second gap 72 is disposed between the column 70 and the mounting groove 223.

[0360] The mounting groove 223 is disposed on the side wall of the movable contact piece 22, and the mounting groove 223 not only provides an accommodating space for the column 70 but also functions to mount the column 70. The outer wall of the column 70 and the inner wall of the mounting groove 223 are not attached to each other, and the second gap 72 is disposed between the outer wall of the column 70 and the inner wall of the mounting groove 223. Due to the existence of the second gap 72, a part of the arc can enter the second gap 72. The second gap 72 provides an accommodating space for the arc, which can reduce the risk of the part of the arc transferring along the movable contact piece 22 in the direction away from the stationary contact leading-out terminal 21 and improve the arc extinguishing effect.

[0361] In one embodiment, one end of the second gap 72 facing the stationary contact leading-out terminal 21 is provided with an open end, and one end of the second gap 72 facing away from the stationary contact leading-out terminal 21 is a closed end.

[0362] The open end of the second gap 72 is configured to introduce an arc, and the second gap 72 is provided with a closed end. The second gap 72 is a non-fully penetrating structure, so that a bend may be formed in the arc path.

[0363] In one embodiment, as shown in FIGS. 53-59, the mounting groove 223 includes a first mounting portion 2231. The first mounting portion 2231 is disposed at the side of the movable contact piece 22 facing the stationary contact leading-out terminal 21. The column 70 is inserted into the first mounting portion 2231. The second gap 72 is disposed between the column 70 and the first mounting portion 2231. The second gap 72 is disposed along an axial direction of the column 70.

[0364] The first mounting portion 2231 is disposed on the side wall of the movable contact piece 22, and also on one side of the movable contact piece 22 facing the stationary contact leading-out terminal 21, that is, the first mounting portion 2231 is located at an upper part of the side wall of the movable contact piece 22. The second gap 72 is disposed between the first mounting portion 2231 and the column 70. Since the second gap 72 is closer to a position where the movable contact piece 22 is in contact with the stationary contact leading-out terminal 21, enabling a part of the arc to enter the second gap 72 directly.

[0365] In addition, a connection between the top surface and the side surface of the column 70 is an edge, and the arc moves to the edge to form an arc concentration. Meanwhile, due to the existence of the second gap 72, a part of the arc may enter the second gap 72, resulting in a height drop in the arc transfer path. The drop makes it difficult for the arc to move further toward the direction away from the stationary contact leading-out terminal 21. The combination of the edge and the drop can improve the arc extinguishing effect.

[0366] In one embodiment, the second gap 72 is a horn-shaped structure with a large opening end disposed facing the stationary contact leading-out terminal 21.

[0367] In one embodiment, as shown in FIGS. 53-59, the mounting groove 223 further includes a fixing portion 2232. The fixing portion 2232 is in communication with the first mounting portion 2231, and the column 70 is engaged with the fixing portion 2232 to fix the second arc barrier 8.

[0368] Specifically, the column 70 is engaged with the fixing portion 2232, that is, the outer wall of the column 70 is attached to or in an interference fit with the inner wall of the fixing portion 2232. The fixing portion 2232 functions to clamp and fix the column 70, to avoid the disengagement of the second arc barrier 8 from the movable contact piece 22.

[0369] In one embodiment, as shown in FIGS. 53-59, the mounting groove 223 further includes a second mounting portion 2233. The second mounting portion 2233 is disposed at the side of the movable contact piece 22 away from the stationary contact leading-out terminal 21. The second mounting portion 2233 is in communication with the first mounting portion 2231 through the fixing portion 2232. The column 70 is inserted into the second mounting portion 2233. A first guiding gap 73 is disposed between the outer wall of the column 70 and the inner wall of the second mounting portion 2233. The first guiding gap 73 is configured to guide the column 70.

[0370] The second mounting portion 2233 is disposed at a side of the movable contact piece 22 away from the stationary contact leading-out terminal 21, that is, the second mounting portion 2233 is located at the lower part of the side wall of the movable contact piece 22. The first guiding gap 73 is disposed between the first mounting portion 2231 and the column 70. The first guiding gap 73 is configured to guide the column 70. Since the column 70 needs to pass through the mounting groove 223 of the movable contact piece 22 from the bottom of the movable contact piece 22 when the second arc barrier 8 is mounted on the movable contact piece 22, the first guiding gap 73 is disposed between the outer wall of the column 70 and the inner wall of the second mounting portion 2233, that is, the outer wall of the column 70 and the inner wall of the second mounting portion 2233 are not attached to each other. The first guiding gap 73 is used to provide a guiding effect for the column 70, facilitating the mounting of the column 70 of the second arc barrier 8.

[0371] It can be understood that the first guiding gap 73 may be a horn-shaped structure with a large opening end disposed facing away from the stationary contact leading-out terminal 21. The large opening end of the second gap 72 serves as an inlet for the passage of the column 70, which further improves the mounting convenience of the second arc barrier 8.

[0372] In one embodiment, the number of the columns 70 is two. The two mounting grooves 223 are disposed on both sides of the movable contact piece 22 along the width direction of the movable contact piece 22 and between the inner edges of the first contact part 220. The two columns 70 are disposed corresponding to the two mounting grooves 223.

[0373] Specifically, the two columns 70 are disposed correspondingly along the width direction of the movable contact piece 22. The two columns 70 may completely cut off the transfer path of the arc toward the direction where the pair of stationary contact leading-out terminals 21 face each other, which can achieve good arc isolation effect.

[0374] In one embodiment, as shown in FIGS. 53-59, the second arc barrier 8 further includes a limiting part 74. The limiting part 74 is disposed at the side of the column 70 away from the movable contact piece 22 and may abut against the movable contact piece 22 to limit the column 70.

[0375] When the second arc barrier 8 is mounted to the movable contact piece 22, the limiting part 74 may abut against the movable contact piece 22 to perform initial positioning and limiting on the column 70 of the second arc barrier 8, and improve the mounting accuracy of the second arc barrier 7.

[0376] In one embodiment, the second arc barrier 7 further includes an arc barrier ring 75. The arc barrier ring 75 wraps the end of the movable contact piece 22 along the length direction of the movable contact piece 22 and at least part of the side wall of the movable contact piece 22.

[0377] The arc barrier ring 75 of the second arc barrier 8 wraps the end of the movable contact piece 22 and at least part of the side wall of the movable contact piece 22, which is equivalent to mounting an arc barrier sleeve on the outer peripheral side of the contact area between the stationary contact leading-out terminal 21 and the movable contact piece 22, which can reduce the ablation of the outer wall of the movable contact piece 22 by the arc and impede the arc from transferring downward along the side wall of the movable contact piece 22, and is conducive to arc extinguishing. In addition, the arc barrier ring 75 is a hollow structure, that is, a central hole is disposed at a center of the arc barrier ring 75, and the arc barrier ring 75 functions to reduce weight, to meet the requirement of lightweight.

[0378] In one embodiment, as shown in FIGS. 53-59, the second arc barrier 8 further includes a connecting part 76. The connecting part 76 is disposed at the bottom of one end of the movable contact piece 22 away from the stationary contact leading-out terminal 21 and connected to both ends of the arc barrier ring 75 respectively. The column 70 is disposed on the connecting part 76.

[0379] If the arc barrier ring 75 has an open end, the arc barrier ring 75 is an open structure. The connecting part 76 is connected to both ends of the arc barrier ring 75 respectively, so that the second arc barrier 8 is an integrated structure to improve the fixing effect between the second arc barrier 8 and the movable contact piece 22. Meanwhile, the connecting part 76 is located at the bottom of the movable contact piece 22 and may not interfere with the mutual contact between the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0380] It should be specially noted that the relay contact assembly 2 provided in this embodiment may be provided with the second arc barrier 8, the second step 71 and the second gap 72 simultaneously. The second step 71 and the second gap 72 form a partial arc barrier structure for restricting part of the arc or the arc from transferring along the movable contact piece 22 toward the direction away from the stationary contact leading-out terminal 21 and restricting part of the arc from transferring along the movable contact piece 22 toward the direction in which the pair of stationary contact leading-out terminals 21 face each other. The second arc barrier 8 made of the insulating material has the performance of arc breaking or arc cooling to achieve the effect of arc extinguishing.

[0381] It can be understood that, in the relay contact assembly 2 provided in this embodiment, the first arc barrier 6 may impede the arc from transferring upward along the outer wall of the stationary contact leading-out terminal 21, the second arc barrier 8 may impede the arc from transferring downward along the outer wall of the movable contact piece 22, and meanwhile, under the combined action of the first arc barrier 6 and the second arc barrier 8, the arc is impeded from transferring toward the direction where the pair of stationary contact leading-out terminals 21 face each other, so as to limit the transfer range of the arc between the movable contact piece 22 and the stationary contact leading-out terminal 21, which can achieve more comprehensive arc isolation, impede the transfer of the arc, and improve the arc extinguishing performance.

[0382] This embodiment also provides a relay, which includes the aforementioned relay contact assembly 2.

[0383] In the relay provided in this embodiment, the movable contact piece 22 of the relay contact assembly 2 is contacted with or separated from a pair of stationary contact leading-out terminals 21; when the movable contact piece 22 is in contact with the stationary contacts at the bottoms of the pair of stationary contact leading-out terminals 21, current flows in from one stationary contact leading-out terminal 21 and flows out from the other stationary contact leading-out terminal 21 after passing through the movable contact piece 22, thereby achieving load connection. The first arc barrier 6 can impede the arc from transferring upward along the outer wall of the stationary contact leading-out terminal 21, the second arc barrier 8 can impede the arc from transferring downward along the outer wall of the movable contact piece 22, and under the combined action of the first arc barrier 6 and the second arc barrier 8, the transfer range of the arc is limited between the movable contact piece 22 and the stationary contact leading-out terminal 21, which can achieve more comprehensive arc isolation, impede the arc transfer, and improve the thoroughness of arc extinguishing.

[0384] In one embodiment, as shown in FIGS. 48-60, the relay provided in this embodiment further includes a contact container 1. The contact container 1 includes an insulating cover 11. The movable contact piece 22 is disposed within the insulating cover 11. The stationary contact leading-out terminal 21 is inserted into the insulating cover 11 and at least partially disposed in the insulating cover 11.

[0385] The insulating cover 11 and the yoke plate are connected by a frame piece 12, and the insulating cover 11 and the yoke plate enclose a contact chamber. The contact chamber provides an arc isolation environment for the contact between the movable contact piece 22 and the stationary contact leading-out terminal 21, to ensure the reliability of the relay during use.

[0386] In one embodiment, the first arc barrier 6 is disposed outside the portion of the stationary contact leading-out terminal 21 located inside the insulating cover 11. The first arc barrier 6 isolates and protects the portion of the stationary contact leading-out terminal 21 located inside the insulating cover 11.

[0387] In one embodiment, as shown in FIGS. 61-62, one surface of the movable contact piece 22 provided in this embodiment facing the stationary contact leading-out terminal 21 is a top surface of the movable contact piece 22. An arc barrier portion is provided on the top surface of the movable contact piece 22 and is configured to impede the movement of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other.

[0388] The arc barrier portion is disposed on the top surface of the movable contact piece 22 to impede the transfer of the arc along the top surface of the movable contact piece 22, thereby isolating and cutting off the transfer path of the arc on the top surface of the movable contact piece 22, and impeding the transfer of the arc toward a center line of the movable contact piece 22 in a length direction, avoiding the arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, enabling the arc to be extinguished efficiently along the originally set arc extinguishing path of the magnetic blow-out field, and improving the arc extinguishing capability.

[0389] In one embodiment, the arc barrier portion is disposed between the inner edges of the two first contact parts 220.

[0390] A portion where the movable contact piece 22 is in contact with the pair of stationary contact leading-out terminals 21 is the first contact part 220, and the arc barrier portion is disposed between the inner edges of the first contact part 220, to cut off the path of arc transferring toward an inner side of the stationary contact leading-out terminals 21, avoid the arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, and ensure the high efficiency and thoroughness of arc extinguishing.

[0391] It should be particularly noted that the inner side specifically refers to a side where the pair of stationary contact leading-out terminals 21 face each other (as shown in FIG. 47, Q refers to a direction in which the pair of stationary contact leading-out terminals 21 face each other), or a side close to the center line W of the movable contact piece 22 in the length direction (as shown in FIG. 61, L refers to a length direction of the movable contact piece 22, and T refers to a width direction of the movable contact piece 22). Therefore, the arc barrier portion is disposed on the side of the first contact part 220 facing the inner side, or the arc barrier part is disposed between the central lines of the two stationary contact leading-out terminals 21 (as shown in FIG. 47, M refers to the central line of the stationary contact leading-out terminal 21).

[0392] It can be understood that at least a part of the first step 61 and / or the first gap 60 is disposed between the inner edges of the first contact part 220.

[0393] In one embodiment, as shown in FIGS. 61-62, the arc barrier portion is a first arc barrier groove 222; and / or, the arc barrier portion is an arc barrier rib 225.

[0394] The arc barrier portion is the first arc barrier groove 222, that is, a recessed structure is provided on the top surface of the movable contact piece 22; the arc barrier portion is the arc barrier rib 225, that is, a protruding structure is provided on the top surface of the movable contact piece 22. These two structures can solve a problem of rapid arc transfer that may occur on the top surface of the movable contact piece 22 with a planar structure. The first arc barrier groove 222 and / or the arc barrier rib 225 can isolate and cut off the path of the arc transferring on the top surface of the movable contact piece 22, and impede the transfer of the arc toward the center line of the movable contact piece 22 in the length direction, avoiding arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21.

[0395] Specifically, the first arc barrier groove 222 includes a first groove wall and a first groove bottom that are connected to each other. The arc moves to the connection between the first groove wall and the top surface of the movable contact piece 22 to form an arc concentration. A height difference between the top surface of one side of the movable contact piece 22 facing the stationary contact leading-out terminal 21 and the first groove bottom is used to impede the movement of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other.

[0396] Since the first arc barrier groove 222 has a first groove wall and a first groove bottom connected with each other, the connection between the first groove wall and the top surface of the movable contact piece 22 is an edge. The arc moves to the edge to form the arc concentration. Meanwhile, the height difference between the top surface of the movable contact piece 22 and the first groove bottom creates a drop on the arc transfer path, which can prevent the arc from easily moving toward the center line of the movable contact piece 22 in the length direction, and the combination of the edge and the drop can improve the arc extinguishing effect.

[0397] In one embodiment, as shown in FIG. 61, the first arc barrier groove 222 is a through groove extending along a width direction of the movable contact piece 22.

[0398] If the first arc barrier groove 222 extends along the length direction of the movable contact piece 22, the arc may transfer along the portion of the top surface of the movable contact piece 22 where the first arc barrier groove 222 is not provided, resulting in a risk of arc short-circuit. Therefore, the first arc barrier groove 222 is configured as a through groove along the width direction of the movable contact piece 22. Since the through groove is arranged to penetrate the width direction of the movable contact piece 22, after the arc enters the first arc barrier groove 222, the transfer path of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other is completely cut off.

[0399] In one embodiment, as shown in FIGS. 61-62, the number of the arc barrier parts is two, the two arc barrier parts are disposed in a one-to-one correspondence with the pair of stationary contact leading-out terminals 21, and the arc barrier parts are disposed on one side of the pair of stationary contact leading-out terminals 21 that face each other.

[0400] Specifically, since the number of the stationary contact leading-out terminals 21 is two, the two first arc barrier grooves 222 are disposed in a one-to-one correspondence with the two stationary contact leading-out terminals 21 and on the inner sides of the stationary contact leading-out terminals 21, such that the arc generated by the separation of the two sets of movable and stationary contacts is subjected to arc isolation through the two first arc barrier grooves 222 in a corresponding manner, which can achieve a dual arc isolation effect and further improve the arc isolation performance.

[0401] In one embodiment, the first arc barrier groove 222 has an arc-shaped structure, and the first arc barrier groove 222 is arranged around the stationary contact leading-out terminal 21.

[0402] Specifically, since the bottom of the stationary contact leading-out terminal 21 is similar to a cylindrical structure, the shape of the first arc barrier groove 222 is adapted to an outer contour of the bottom of the stationary contact leading-out terminal 21. The first arc barrier groove 222 with the arc-shaped structure is arranged along the outer contour of the stationary contact leading-out terminal 21 and around the stationary contact leading-out terminal 21, to impede the arc transfer path in all directions.

[0403] It can be understood that the first arc barrier groove 222 with the arc-shaped structure extends from one side to the other side of the movable contact piece 22 along the width direction, so that contact parts are formed on the portions at both ends of the movable contact piece 22 along the length direction where the first arc barrier groove 222 is not provided, and the contact parts are used for contacting the stationary contact leading-out terminal 21.

[0404] It should be particularly noted that, as shown in FIGS. 61-62, the first arc barrier groove 222 may be replaced by the arc barrier rib 225, and the arrangement position and shape of the arc barrier rib 225 are similar to those of the first arc barrier groove 222, which will not be repeated.

[0405] This embodiment also provides a relay, including the relay contact assembly 2 as described above.

[0406] In the relay provided in this embodiment, the movable contact piece 22 and the pair of stationary contact leading-out terminals 21 of the relay contact assembly 2 are contacted with or separated from one another. When the movable contact piece 22 comes into contact with the stationary contacts at the bottom of the pair of stationary contact leading-out terminals 21, current flows in from one stationary contact leading-out terminal 21, passes through the movable contact piece 22 and then flows out of the other stationary contact leading-out terminal 21, thereby connecting the load.

[0407] In one embodiment, as shown in FIGS. 60, 63-64, the relay further includes a push assembly 4, which includes a push rod unit 41, an elastic member 43 and a U-shaped bracket 42. The push rod unit 41 includes a base 413 and a push rod 411, and the base 413 and an upper part of the push rod 411 may be integrally injection-molded. The U-shaped bracket 42 and the base 413 enclose a frame structure, the movable contact piece 22 and the elastic member 43 are mounted within the frame structure enclosed by the U-shaped bracket 42 and the base 413. One end of the elastic member 43 abuts against the base 413, and the other end of the elastic member 43 abuts against the movable contact piece 22. The elastic member 43 may provide an elastic force, so that the movable contact piece 22 has a tendency to move away from the base 413 and approach the stationary contact leading-out terminal 21.

[0408] Specifically, the push rod unit 41 and the U-shaped bracket 42 are matched through the limiting protrusion 412 and the limiting hole. A moving force of the push rod unit 41 may be transmitted to the U-shaped bracket 42 for driving the movement of the movable contact piece 22, so that the movable contact piece 22 can be contacted with or separated from the pair of stationary contact leading-out terminals 21.

[0409] As shown in FIGS. 60, 63-64, the push assembly 4 of the relay further includes an electromagnet unit 44, which is disposed on a side of a yoke plate facing away from the insulating cover 11. The push rod unit 41 is drivenly connected to the electromagnet unit 44, and the push rod unit 41 is movably disposed in a driving chamber enclosed by a metal cover and the yoke plate, and abuts against the movable contact piece 22 through a via hole of the yoke plate. When the electromagnet unit 44 is energized, the push rod unit 41 may be driven to move, to further drive the movable contact piece 22 to move, so as to contact with or separate from the stationary contact leading-out terminal 21.

[0410] The electromagnet unit 44 includes a coil bobbin 441, a coil 442, a stationary core 444, a movable core 443, a U-shaped yoke 445, a magnetic sleeve 446 and a spring 447. The coil bobbin 441 is disposed within the U-shaped yoke 445, the coil bobbin 441 is in a hollow cylindrical shape and made of an insulating material. The magnetic sleeve 446 penetrates through and is disposed within the coil bobbin 441, and the coil 442 is wound around the coil bobbin 441. The stationary core 444 is provided with a second perforation that is arranged corresponding to the via hole of the yoke plate, through which the push rod unit 41 may pass. The movable core 443 is movably disposed within the magnetic sleeve 446 and arranged opposite to the stationary core 444. The spring 447 is disposed between the stationary core 444 and the movable core 443 and is capable of abutting against each of them. The movable core 443 is connected to the push rod unit 41 and configured to be attracted by the stationary core 444 when the coil 442 is energized. The movable core 443 and the push rod unit 41 may be connected by screwing, riveting, welding or other means.

[0411] The working process of the relay provided in this embodiment is as follows: When the coil 442 is energized, the stationary core 444 attracts the movable core 443, the movable core 443 drives the push rod unit 41 to move upward, the spring 447 between the stationary core 444 and the movable core 443 is compressed, and the push rod unit 41 pushes the movable contact piece 22 to move by means of the U-shaped bracket 42 and the elastic member 43, so that the two ends of the movable contact piece 22 are respectively in contact with the two stationary contact leading-out terminals 21, to close the movable and stationary contacts.

[0412] When the current of the coil 442 is interrupted, the stationary core 444 releases the attraction to the movable core 443. Under the elastic force of the compressed spring 447, the movable core 443 drives the push rod unit 41 to move downward, so that the movable contacts at the two ends of the movable contact piece 22 are separated from the two stationary contact leading-out terminals 21, to separate the movable and stationary contacts.

[0413] In one embodiment, as shown in FIGS. 60, 63-64, the relay further includes an arc extinguishing unit 5, which is disposed within a hollow chamber of the housing and configured to extinguish the arc of the contact assembly 2. The arc extinguishing unit 5 includes two arc extinguishing magnets 51. The arc extinguishing magnets 51 may be permanent magnets, and each arc extinguishing magnet 51 may substantially be a cuboid. The two arc extinguishing magnets 51 are respectively disposed on both sides of the insulating cover 11 and oppositely arranged along the length direction of the movable contact piece 22.

[0414] In this embodiment, the two arc extinguishing magnets 51 are respectively located on the left and right sides of the insulating cover 11. The surfaces facing to one another of the two arc extinguishing magnets 51 have opposite polarities. That is to say, a left surface of the arc extinguishing magnet 51 on the left side of the insulating cover 11 is an S pole and a right surface thereof is an N pole, and the left surface of the arc extinguishing magnet 51 on the right side of the insulating cover 11 is an S pole and the right surface thereof is an N pole.

[0415] Certainly, the surfaces facing to one another of the two arc extinguishing magnets 51 may also be designed to have the same polarity. For example, the left surface of the arc extinguishing magnet 51 on the left side of the insulating cover 11 is an S pole and the right surface thereof is an N pole, and the left surface of the arc extinguishing magnet 51 on the right side of the insulating cover 11 is an N pole and the right surface thereof is an S pole.

[0416] By arranging two oppositely disposed arc extinguishing magnets 51, a magnetic field may be formed around the contact assembly 2.

[0417] Therefore, the arc generated between the stationary contact leading-out terminal 21 and the movable contact piece 22 may be elongated in the direction away from each other under the action of the magnetic field, thereby realizing arc extinguishing.

[0418] The arc extinguishing unit 5 further includes two yoke clamps 52, which are arranged in positions corresponding to the two arc extinguishing magnets 51. Moreover, the two yoke clamps 52 surround the insulating cover 11 and the two arc extinguishing magnets 51. The design of the yoke clamps 52 surrounding the arc extinguishing magnets 51 can prevent the magnetic field generated by the arc extinguishing magnets 51 from diffusing outward and affecting the arc extinguishing effect. The yoke clamps 52 are made of soft magnetic materials. The soft magnetic materials may include but are not limited to iron, cobalt, nickel and the alloys thereof, etc.

[0419] When the short-circuit load is large, under the action of the short-circuit current, an electro-dynamic repulsive force is generated between the movable contact piece 22 and the stationary contact leading-out terminal 21, causing the contacts to bounce open, which leads to the arc generation between the contacts and violent burning thereof, and even explosion may occur.

[0420] To this end, as shown in FIGS. 47-53, the relay provided in this embodiment further includes a short-circuit resistant assembly 3, which is disposed at least on one side of the movable contact piece 22 along the axial direction of the stationary contact leading-out terminal 21 and generates a suction force when a high fault current occurs in the movable contact piece 22, for resisting the electro-dynamic repulsive force between the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0421] The short-circuit resistant assembly 3 may also be a short-circuit ring disposed between the pair of stationary contact leading-out terminals 21. For a high-voltage DC relay, the first arc barrier 6 may prevent the arc from being attracted by the short-circuit resistant assembly 3 and thus moving toward the direction where the pair of stationary contact leading-out terminals 21 face each other, avoiding the decrease in insulation between the contacts or arc short-circuiting.

[0422] The axial direction of the stationary contact leading-out terminal 21, the length direction of the movable contact piece 22 and the width direction of the movable contact piece 22 are perpendicular to each other.

[0423] Specifically, the thrust part 221 of the movable contact piece 22 is disposed between the two contact parts, and the short-circuit resistant assembly 3 is disposed on the thrust part 221 of the movable contact piece 22. Both sides of the thrust part 221 are of a planar structure, and the bilateral planes of the thrust part 221 provide mounting convenience and reliability for the short-circuit resistant assembly 3. The short-circuit resistant assembly 3 is configured to resist the electro-dynamic repulsive force between the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0424] In one embodiment, as shown in FIGS. 47-53, the short-circuit resistant assembly 3 includes an upper magnetic conductor 31 and a lower magnetic conductor 32, the upper magnetic conductor 31 is disposed on one side of the movable contact piece 22 facing the stationary contact leading-out terminal 21, and the lower magnetic conductor 32 is at least partially disposed on one side of the movable contact piece 22 facing away from the stationary contact leading-out terminal 21, so as to form a magnetic conductive circuit between the upper magnetic conductor 31 and the lower magnetic conductor 32. The upper magnetic conductor 31 and the lower magnetic conductor 32 may be made of materials such as iron, cobalt, nickel and their alloys.

[0425] The upper magnetic conductor 31 is disposed on one side of the thrust part 221 facing the stationary contact leading-out terminal 21, and the lower magnetic conductor 32 is disposed on one side of the thrust part 221 facing away from the stationary contact leading-out terminal 21, that is, the lower magnetic conductor 32 is fixed below the thrust part 221 of the movable contact piece 22. A magnetic conductive circuit may be formed between the upper magnetic conductor 31 and the lower magnetic conductor 32, and the lower magnetic conductor 32 may move together with the movable contact piece 22 toward the direction close to the stationary contact leading-out terminal 21. When a high fault current occurs in the movable contact piece 22, since the upper magnetic conductor 31 is located above the movable contact piece 22 and the lower magnetic conductor 32 is located below the movable contact piece 22, the movable contact piece 22 is clamped between the two magnets of the upper magnetic conductor 31 and the lower magnetic conductor 32. When the upper magnetic conductor 31 generates a suction force on the lower magnetic conductor 32, the suction force acts to attract and pull the movable contact piece 22, and is used to resist the electro-dynamic repulsive force generated by the fault current between the movable contact piece 22 and the stationary contact leading-out terminal 21, avoiding the arcing and explosion caused by the separation between the movable contact piece 22 and the stationary contact leading-out terminal 21, and ensuring the reliability and safety of the contact between the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0426] In one embodiment, the upper magnetic conductor 31 may be of a linear structure, and is disposed at a position corresponding to between the two contact parts of the movable contact piece 22, and the upper magnetic conductor 31 may extend along the width direction of the movable contact piece 22, for the matching and correspondence of the upper magnetic conductor 31 and the lower magnetic conductor 32. The lower magnetic conductor 32 is of a U-shaped structure, and the opening of the lower magnetic conductor 32 is disposed toward the movable contact piece 22, such that the two side arms of the lower magnetic conductor 32 extend toward the upper magnetic conductor 31, so that the two side arms of the lower magnetic conductor 32 may be close to or in contact with the two ends of the upper magnetic conductor 31 respectively, so as to form a surrounding magnetic conductive ring on the movable contact piece 22 along its width direction. Since the contact parts at the two ends of the movable contact piece 22 along its length direction are movable contacts, the surrounding magnetic conductive ring formed along the width direction of the movable contact piece 22 may not cause interference. When a high fault current occurs in the movable contact piece 22, an electromagnetic suction force in the direction of the movable contact pressure is generated to resist the electro-dynamic repulsive force generated by the fault current between the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0427] The thrust part 221 of the movable contact piece 22 provided in this embodiment is provided with a through hole 2211, and the lower magnetic conductor 32 is at least partially inserted into the through hole 2211.

[0428] In this way, the thrust part 221 of the movable contact piece 22 provides a mounting and fixing position for the lower magnetic conductor 32, so as to improve the fixing effect between the movable contact piece 22 and the lower magnetic conductor 32. Since the lower magnetic conductor 32 is of a similar U-shaped structure, the opening of the lower magnetic conductor 32 is disposed toward the thrust part 221 of the movable contact piece 22, one side arm of the lower magnetic conductor 32 wraps around a long side of the movable contact piece 22, and the other side arm of the lower magnetic conductor 32 is inserted into the through hole 2211.

[0429] In one embodiment, the number of the upper magnetic conductors 31 and the lower magnetic conductors 32 is multiple, the multiple upper magnetic conductors 31 are disposed in correspondence with the multiple lower magnetic conductors 32, and the sides of two adjacent lower magnetic conductors 32 close to each other are inserted into the through hole 2211.

[0430] The multiple upper magnetic conductors 31 are disposed in correspondence with the multiple lower magnetic conductors 32 to enhance the magnetic attraction effect between the upper magnetic conductors 31 and the lower magnetic conductors 32, further improve the effect of attracting and pulling the movable contact piece 22, and thus resist the electro-dynamic repulsive force generated by the fault current between the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0431] For example, the number of the upper magnetic conductors 31 and the lower magnetic conductors 32 is two, the side walls of the two lower magnetic conductors 32 close to each other are inserted into the through hole 2211 simultaneously, and the same through hole 2211 is used to realize the mounting of the two lower magnetic conductors 32, which can reduce the production cost and assembly difficulty.

[0432] It should be particularly noted that the U-shaped bracket 42 may be fixedly connected to the upper magnetic conductor 31, the lower magnetic conductor 32 is connected to the bottom of the movable contact piece 22, the movable contact piece 22 and the lower magnetic conductor 32 form a movable member, and the short-circuit resistant assembly 3 and the movable contact piece 22 are disposed between the U-shaped bracket 42 and the push rod unit 41.Eighth Embodiment

[0433] This embodiment is similar to the seventh embodiment, with the only difference in the structure of the first arc barrier groove 222.

[0434] As shown in FIGS. 65-67, the first arc barrier groove 222 provided in this embodiment has at least one of a linear structure, a convex structure and an X-shaped structure.

[0435] Specifically, as shown in FIG. 65, the first arc barrier groove 222 is of a linear structure with a simple structure and convenient production and processing. Moreover, since a width of the first arc barrier groove 222 along the length direction of the movable contact piece 22 is relatively narrow, the overall structural strength of the movable contact piece 22 is relatively high.

[0436] As shown in FIG. 66, the first arc barrier groove 222 has a convex structure, so that the first arc barrier groove 222 has a broken-line groove structure, which increases the tortuosity of the transfer path of the arc, thereby improving the arc extinguishing effect.

[0437] As shown in FIG. 67, the first arc barrier groove 222 has an X-shaped structure. The X-shaped structure includes two intersecting slots, so that the arc on each side can be blocked by the transfer path through the two slots, playing a dual arc isolation role with good isolation and arc extinguishing effects.

[0438] It can be understood that the two first arc barrier grooves 222 in this embodiment may have the same or different shapes. For example, one of the first arc barrier grooves 222 has a convex structure, and the other of the first arc barrier grooves 222 has a linear structure.

[0439] It can be understood that the first arc barrier groove 222 provided in this embodiment includes but is not limited to the linear structure and the X-shaped structure, and may also have an S-shaped structure, a tapered structure, etc. Its specific shape can be adjusted according to actual production conditions.

[0440] It should be particularly noted that, as shown in FIGS. 68-70, the first arc barrier groove 222 may be replaced by an arc barrier rib 225, and the arrangement position and shape of the arc barrier rib 225 are similar to those of the first arc barrier groove 222, which will not be repeated.Ninth Embodiment

[0441] This embodiment is similar to the seventh embodiment, with the only difference in the quantity and structure of the arc barrier portions.

[0442] As shown in FIGS. 71-72, the number of the arc barrier portions provided in this embodiment is one. the portion of the movable contact piece 22, which is not provided with the arc barrier portion, and portions on both sides of the movable contact piece 22 along the length direction are in contact with the pair of stationary contact leading-out terminals 21, respectively.

[0443] Specifically, since one first arc barrier groove 222 is disposed between the pair of stationary contact leading-out terminals 21, and the width of the first arc barrier groove 222 along the length direction of the movable contact piece 22 is relatively wide, the portions of the movable contact piece 22, which are not provided with the first arc barrier groove 222 and disposed on both ends along the length direction are respectively two contact parts. The two contact parts are respectively in contact with the pair of stationary contact leading-out terminals 21. The arc isolation process for the two sets of movable and stationary contacts can be realized by using one first arc barrier groove 222, which has a simple structure and relatively low production cost.

[0444] In one embodiment, as shown in FIGS. 71-72, a distance between the two side edges of the first arc barrier groove 222 along the length direction of the movable contact piece 22 is less than or equal to a distance between the bottoms of the pair of stationary contact leading-out terminals 21.

[0445] Specifically, the width of the first arc barrier groove 222 along the length direction of the movable contact piece 22 extends to a vicinity of the inner side edges of the bottoms of the stationary contact leading-out terminals 21 or is flush with the inner side edges of the bottoms of the stationary contact leading-out terminals 21, so that the edge between the first groove wall of the first arc barrier groove 222 and the top surface of the movable contact piece 22 is as close as possible to the bottoms of the stationary contact leading-out terminals 21. The arc can be concentrated at the edge as soon as possible, and the drop between the top surface of the movable contact piece 22 and the first groove bottom of the first arc barrier groove 222 is utilized to reduce the risk of the arc transferring toward the center line of the movable contact piece 22.

[0446] It should be particularly noted that, as shown in FIGS. 71-72, the first arc barrier groove 222 may be replaced by the arc barrier rib 225, and the arrangement position and shape of the arc barrier rib 225 are similar to those of the first arc barrier groove 222, which will not be repeated.Tenth Embodiment

[0447] This embodiment is similar to the seventh embodiment and the eighth embodiment, with the difference in that other detailed structures of the movable contact piece 22 are added on the basis of the first embodiment or the second embodiment.

[0448] In the movable contact piece 22 provided in this embodiment, a second arc barrier groove may also be provided on the side walls of the movable contact piece 22, and the second arc barrier grooves are configured to impede the movement of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other.

[0449] This embodiment provides a movable contact piece 22. The second arc barrier grooves are disposed on the side walls of the movable contact piece 22 to impede the arc transfer along the side walls of the movable contact piece 22 toward the center line of the movable contact piece 22 in the length direction, thereby isolating and cutting off the transfer path of the arc on the side walls of the movable contact piece 22, avoiding the arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, enabling the arc to be extinguished efficiently along the originally set arc extinguishing path of the magnetic blow-out field, and improving the arc extinguishing capability.

[0450] In one embodiment, the second arc barrier grooves are disposed between the center lines of the pair of the stationary contact leading-out terminals 21.

[0451] In other words, the second arc barrier grooves are disposed on the inner side of the stationary contact leading-out terminals 21, to cut off the transfer path of the arc toward the inner side of the stationary contact leading-out terminals 21, avoid the arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, and ensure the high efficiency and thoroughness of arc extinguishing.

[0452] In one embodiment, the number of the second arc barrier grooves is multiple, and the multiple second arc barrier grooves are disposed on both sides of the movable contact piece 22 along the length direction of the movable contact piece 22; and / or, the number of the second arc barrier grooves is multiple, and the multiple second arc barrier grooves are disposed on both sides of the movable contact piece 22 along the width direction of the movable contact piece 22.

[0453] Specifically, the number of the second arc barrier grooves is four, with two second arc barrier grooves provided on each side of the movable contact piece 22 along its length direction, and two second arc barrier grooves provided on each side of the movable contact piece 22 along its width direction. The four second arc barrier grooves are disposed at four corners of the thrust part 221 of the movable contact piece 22, so that the arc may be isolated by the second arc barrier grooves no matter in which directions the arc transfers along the side walls of the movable contact piece 22, which can improve the arc isolation effect.

[0454] In one embodiment, the second arc barrier groove includes a second groove wall and a second groove bottom that are connected to each other. The arc moves to the connection between the second groove wall and the side wall of the movable contact piece 22 to form an arc concentration. A height difference between the side wall of the movable contact piece 22 and the second groove bottom is used to impede the movement of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other.

[0455] Since the second arc barrier groove has the second groove wall and the second groove bottom connected with each other, the connection between the second groove wall and the side wall of the movable contact piece 22 is an edge. The arc moves to the edge to form an arc concentration. The height difference between the side wall of the movable contact piece 22 and the second groove bottom creates a drop on the arc transfer path along the side wall of the movable contact piece 22, which can prevent the arc from easily moving toward the center line of the movable contact piece 22 in the length direction, and the combination of the edge and the drop can improve the arc extinguishing effect.

[0456] In one embodiment, the second arc barrier groove is a through groove extending along the axial direction of the stationary contact leading-out terminal 21.

[0457] If the second arc barrier groove extends along the length direction of the movable contact piece 22, the arc can transfer along the part of the side wall of the movable contact piece 22 where the second arc barrier groove is not provided, resulting in a risk of arc short-circuit. Therefore, the second arc barrier groove is configured as a through groove extending along an axial direction of the stationary contact leading-out terminal 21. Since the through groove is arranged to penetrate a height direction of the movable contact piece 22, after the arc enters the second arc barrier groove, the transfer path of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other is completely cut off.

[0458] It should be noted herein that the movable contact piece shown in the accompanying drawings and described in the present specification is merely an example used in the principles of the present disclosure. Those skilled in the art should clearly understand that the principles of the present disclosure are not limited to any details or any components of the devices shown in the accompanying drawings or described in the specification.

[0459] It should be understood that the present disclosure is not limited to the detailed structure and arrangement of components set forth in this specification. The present disclosure may have other embodiments and may be implemented and carried out in various ways. The foregoing variations and modifications fall within the scope of the present disclosure. It should be understood that the present disclosure as disclosed and defined in this specification extends to all alternative combinations of two or more individual features mentioned herein and / or shown in the accompanying drawings. All such different combinations constitute various alternative aspects of the present disclosure. The embodiments described in this specification illustrate the best mode known for carrying out the present disclosure and will enable those skilled in the art to utilize the present disclosure.

[0460] Other embodiments of the present disclosure will be easily conceived by those skilled in the art upon consideration of the specification and practice of the contents disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or conventional technical means in the technical field which are not disclosed by the present disclosure. The specification and example embodiments are regarded as illustrative only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

[0461] It should be understood that the present disclosure is not limited to the precise structure that has been described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The protection scope of the present disclosure is limited only by the appended claims.

Examples

first embodiment

[0039]The present embodiment provides a contact unit. As shown in FIGS. 1-2, the contact unit includes a movable contact piece 22 and a pair of stationary contact leading-out terminals 21. The movable contact piece 22 is configured to contact with or separate from the pair of stationary contact leading-out terminals 21.

[0040]In the contact unit provided by the present embodiment, the movable contact piece 22 is contacted with or separated from the pair of stationary contact leading-out terminals 21. When the movable contact piece 22 comes into contact with stationary contacts at the bottom of the pair of stationary contact leading-out terminals 21, current flows in from one stationary contact leading-out terminal 21, passes through the movable contact piece 22 and then flows out of the other stationary contact leading-out terminal 21, thereby connecting a load.

[0041]In one embodiment, the stationary contact is provided at the bottom of the stationary contact leading-out terminal 21....

second embodiment

[0117]This embodiment is similar to the first embodiment, with the difference in the structure of the first arc barrier groove 222.

[0118]As shown in FIGS. 14-16, the first arc barrier groove 222 provided in this embodiment has at least one of a linear structure, a convex structure and an X-shaped structure.

[0119]Specifically, as shown in FIG. 14, the first arc barrier groove 222 is of a linear structure with a simple structure and convenient production and processing. Moreover, since a width of the first arc barrier groove 222 along the length direction of the movable contact piece 22 is relatively narrow, the overall structural strength of the movable contact piece 22 is relatively high.

[0120]As shown in FIG. 15, the first arc barrier groove 222 has a convex structure, so that the first arc barrier groove 222 has a broken-line groove structure, which increases the tortuosity of the transfer path of the arc root, thereby improving the arc extinguishing effect.

[0121]As shown in FIG. ...

third embodiment

[0125]This embodiment is similar to the first embodiment, with the only difference in the quantity and structure of the arc barrier portions.

[0126]As shown in FIGS. 20-21, the number of the arc barrier portions provided in this embodiment is one, and the portions of the movable contact piece 22, which are not provided with the arc barrier portions, are located at both sides along the length direction of the movable contact piece 22 and respectively in contact with the pair of stationary contact leading-out terminals 21.

[0127]Specifically, when the arc barrier portion is the first arc barrier groove 222, since one first arc barrier groove 222 is disposed between the pair of stationary contact leading-out terminals 21, and the width of the first arc barrier groove 222 along the length direction of the movable contact piece 22 is relatively wide, the portions of the movable contact piece 22, which are not provided with the first arc barrier groove 222 and disposed on both ends along th...

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The present disclosure claims priorities of the Chinese patent applications with application No.202322110339.4, 202310986454.X and 202310986397.5 filed on August 07, 2023, the entire contents of which are incorporated herein by reference in their entirety.TECHNICAL FIELD

[0002] The present disclosure generally relates to the field of electric power technology, in particular to an arc barrier structure, a contact unit and a relay.BACKGROUND

[0003] A relay is an electronic control device applied in automatic control circuits, which has a control system (also referred to as an input circuit) and a controlled system (also referred to as an output circuit), and is actually an "automatic switch" that controls a relatively large current with a relatively small current. Therefore, it plays roles such as automatic regulation, safety protection and circuit conversion in the circuit. As one type of relays, most existing high-voltage DC relays adopt a direct-acting structure of movable contact piece, i.e., the function of connecting and breaking loads can be achieved by the cooperation of two stationary contacts and one movable contact piece.

[0004] A principle of the interruption of the high-voltage DC relay is to generate a directional magnetic blow-out field by arranging a permanent magnet. When an arc is generated due to the separation of the movable and stationary contacts, the arc is rapidly elongated under the action of the magnetic blow-out field until the arc is extinguished, and the extinguishing of the arc can realize the breaking of the load. The most severe breaking is called as "ultimate breaking", and the load of ultimate breaking is several times the rated load. If the arc is not stable enough at the movable and stationary contacts and the arc transfers on the surfaces of the movable and stationary contacts, the arc cannot be extinguished mainly along a magnetic blow-out arc pulling path, eventually resulting in the failure to break the arc, and the product may explode and burn due to overload and overheating.

[0005] In addition, in order to meet the short-circuit resistant requirement, the existing high-voltage DC relays are usually provided with soft magnets, i.e., short-circuit resistant rings, near the internal movable and stationary contacts, to generate electro-dynamic attractive force to resist the electro-dynamic repulsive force when short-circuit current passes through. However, since the soft magnets will be magnetized near the energized conductors, they will have an attractive effect on the arc.

[0006] Due to the arrangement of the soft magnets, i.e., the short-circuit resistance rings, during the ultimate breaking of the relay, the arc is affected not only by the magnetic blow-out field but also by the magnetized soft magnets, leading to arc chaos and reducing the "ultimate breaking" capability of the high-voltage DC relay, and also causing the short-circuit ring to burn out, affecting the short-circuit resistant effect. If auxiliary contacts are arranged above the short-circuit ring, the arc may also burn out the auxiliary contacts.SUMMARY

[0007] The present disclosure provides an arc barrier structure, a contact unit and a relay, which can improve the reliability of arc breaking and feature favorable safety performance.

[0008] According to a first aspect of the present disclosure, there is provided an arc barrier structure, including: a first arc barrier disposed outside a stationary contact leading-out terminal, a pair of stationary contact leading-out terminals being configured to contact with or separate from a movable contact piece.

[0009] A first step and / or a first gap is provided between the first arc barrier and the stationary contact leading-out terminal to impede arc transfer.

[0010] In some implementations, the first arc barrier is sleeved outside the stationary contact leading-out terminal.

[0011] In some implementations, a stationary contact is provided at a bottom of the stationary contact leading-out terminal, and an outer peripheral wall of the first arc barrier protrudes beyond an outer peripheral wall of the stationary contact.

[0012] The stationary contact leading-out terminal and the stationary contact are integrally or separately formed.

[0013] In some implementations, an outer wall of the first arc barrier protrudes beyond an outer peripheral wall of the stationary contact leading-out terminal, and the first step is formed between a bottom wall at one end of the first arc barrier facing the movable contact piece and an outer peripheral wall of a corresponding stationary contact leading-out terminal.

[0014] In some implementations, the first gap is provided between an inner wall at the bottom of one end of the first arc barrier facing the movable contact piece and an outer wall of the stationary contact leading-out terminal.

[0015] In some implementations, one end of the first gap facing the movable contact piece is provided with an open end, and one end of the first gap away from the movable contact piece is a closed end.

[0016] In some implementations, the first gap is provided between an inner peripheral wall at the bottom of the first arc barrier and an outer peripheral wall at the bottom of the stationary contact leading-out terminal.

[0017] In some implementations, one of an inner wall of the first arc barrier and an outer wall of the stationary contact leading-out terminal is provided with a positioning part, and the other of the inner wall of the first arc barrier and the outer wall of the stationary contact leading-out terminal is provided with a fitting part, and the positioning part is engaged with the fitting part.

[0018] In some implementations, the first arc barrier is made of an insulating material.

[0019] In some implementations, a first guiding gap is provided between an inner wall at a top of one end of the first arc barrier away from the movable contact piece and an outer wall of the corresponding stationary contact leading-out terminal, and the first guiding gap is configured to guide the stationary contact leading-out terminal.

[0020] According to a second aspect of the present disclosure, a contact unit of the present disclosure includes a movable contact piece, a pair of stationary contact leading-out terminals, and the arc barrier structure, wherein the movable contact piece is configured to contact with or separate from the pair of stationary contact leading-out terminals, the first arc barrier of the arc barrier structure is disposed outside the stationary contact leading-out terminal, and the arc barrier structure is configured to impede arc transfer.

[0021] In some implementations, a portion where the movable contact piece is in contact with the pair of stationary contact leading-out terminals is a first contact part, and at least part of the first step and / or the first gap is disposed between inner edges of the first contact parts.

[0022] In some implementations, one surface of the movable contact piece facing the stationary contact leading-out terminal is a top surface of the movable contact piece, an arc barrier portion is provided on the top surface of the movable contact piece, and the arc barrier portion is configured to impede movement of an arc toward a direction in which the pair of stationary contact leading-out terminals face each other.

[0023] In some implementations, the arc barrier portion is a first arc barrier groove; and / or, the arc barrier portion is an arc barrier rib.

[0024] In some implementations, a portion where the movable contact piece is in contact with the pair of stationary contact leading-out terminals is a first contact part, and the arc barrier portion is disposed between inner edges of the two first contact parts.

[0025] In some implementations, the contact unit further includes an insulating cover, wherein the movable contact piece is movably disposed within the insulating cover, and the stationary contact leading-out terminal is inserted into the insulating cover and is at least partially disposed within the insulating cover.

[0026] In some implementations, the first arc barrier is disposed outside a portion of the stationary contact leading-out terminal located within the insulating cover.

[0027] In some implementations, there is also provided an anti-short circuit assembly. The short-circuit resistance assembly is provided at least at a side of the movable contact piece facing the stationary contact leading-out terminal, and is configured to generate an attractive force upon occurrence of a high fault current in the movable contact piece to resist an electro-dynamic repulsive force between the movable contact piece and the stationary contact leading-out terminal.

[0028] According to a third aspect of the present disclosure, a relay of the present disclosure includes the above contact unit.

[0029] One embodiment of the present disclosure has following advantages or beneficial effects:

[0030] In the arc barrier structure provided by the embodiment of the present disclosure, the first step and / or the first gap is provided at a position where the first arc barrier is in contact with the stationary contact leading-out terminal and on a moving path of the arc, that is, a bend is formed on the arc path, which can consume kinetic energy of the arc and better block the arc transfer. The arc has two transfer directions: first, the first step and / or the first gap can block the arc from transferring toward the direction in which the pair of stationary contact leading-out terminals face each other, to avoid the occurrence of arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece and the pair of stationary contact leading-out terminals; second, the first step and / or the first gap can block the arc from transferring upward along the outer wall of the stationary contact leading-out terminal toward the direction away from the movable contact piece, further reduce the ablation of the outer wall of the stationary contact leading-out terminal by the arc, improve the arc extinguishing capability and effect, and thus improve the interruption capability between the movable contact and the stationary contact corresponding to the movable contact piece and the stationary contact leading-out terminal.

[0031] The present disclosure provides a contact unit and a relay. The movable contact piece of the contact unit is configured to contact with or separate from the pair of stationary contact leading-out terminals. When the movable contact piece is in contact with the stationary contacts at the bottom of the pair of stationary contact leading-out terminals, current flows in from one stationary contact leading-out terminal, passes through the movable contact piece and then flows out of the other stationary contact leading-out terminal, thereby realizing load connection. When the arc moves up and down along the outer wall of the stationary contact leading-out terminal under the action of the magnetic field, the arc barrier structure is disposed outside the stationary contact leading-out terminal, and under the action of the arc barrier structure, a risk of arc ablation on the peripheral side wall of the stationary contact leading-out terminal can be reduced.

[0032] The above and other objectives, features and advantages of the present disclosure will become more apparent from the following description of the preferred embodiments with reference to the accompanying drawings.BRIEF DESCRIPTION OF THE DRAWINGS

[0033] For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the accompanying drawings below. Components in the accompanying drawings are not necessarily drawn to scale, and relevant elements may be omitted to emphasize and clearly illustrate the technical features of the present disclosure. In addition, relevant elements or components may be arranged differently as known in the art. Furthermore, in the accompanying drawings, the same reference numerals denote the same or similar components throughout the various drawings. The above and other features and advantages of the present disclosure will become more apparent by describing the exemplary embodiments thereof in detail with reference to the accompanying drawings. FIG. 1 is a first schematic structural view of a relay provided in a first embodiment of the present disclosure; FIG. 2 is a sectional view taken along line A1-A1 of FIG. 1; FIG. 3 is a first schematic view of cooperation of a stationary contact leading-out terminal and a first arc barrier in the relay provided in the first embodiment of the present disclosure; FIG. 4 is a second schematic view of the cooperation of the stationary contact leading-out terminal and the first arc barrier in the relay provided in the first embodiment of the present disclosure; FIG. 5 is a sectional view taken along line C1-C1 of FIG. 4; FIG. 6 is an enlarged partial view of part B0 in FIG. 2; FIG. 7 is a first schematic structural view of a movable contact piece in the relay provided in the first embodiment of the present disclosure; FIG. 8 is a second schematic structural view of a movable contact piece in the relay provided in the first embodiment of the present disclosure; FIG. 9 is a first exploded schematic view of the relay provided in the first embodiment of the present disclosure; FIG. 10 is a second schematic structural view of the relay provided in the first embodiment of the present disclosure; FIG. 11 is a second exploded schematic view of the relay provided in the first embodiment of the present disclosure; FIG. 12 is a schematic structural view of a contact container in the relay provided in the first embodiment of the present disclosure; FIG. 13 is a schematic structural view of a push rod unit in the relay provided in the first embodiment of the present disclosure; FIG. 14 is a first schematic structural view of a movable contact piece in a relay provided in a second embodiment of the present disclosure; FIG. 15 is a second schematic structural view of the movable contact piece in the relay provided in the second embodiment of the present disclosure; FIG. 16 is a third schematic structural view of the movable contact piece in the relay provided in the second embodiment of the present disclosure; FIG. 17 is a fourth schematic structural view of a movable contact piece in the relay provided in the second embodiment of the present disclosure; FIG. 18 is a fifth schematic structural view of the movable contact piece in the relay provided in the second embodiment of the present disclosure; FIG. 19 is a sixth schematic structural view of the movable contact piece in the relay provided in the second embodiment of the present disclosure; FIG. 20 is a first schematic structural view of the movable contact piece in a relay provided in a third embodiment of the present disclosure; FIG. 21 is a second schematic structural view of the movable contact piece in the relay provided in the third embodiment of the present disclosure. FIG. 22 is a first schematic structural view of a relay provided in a fourth embodiment of the present disclosure; FIG. 23 is a sectional view taken along line A2-A2 of FIG. 22; FIG. 24 is a first exploded schematic view of the relay provided in the fourth embodiment of the present disclosure; FIG. 25 is a first schematic view of the cooperation of a movable contact piece and a first arc barrier in the relay provided in the fourth embodiment of the present disclosure; FIG. 26 is a second schematic view of the cooperation of the movable contact piece and the first arc barrier in the relay provided in the fourth embodiment of the present disclosure; FIG. 27 is a sectional view taken along part B1-B1 of FIG. 26; FIG. 28 is an enlarged partial view of part B2 in FIG. 26; FIG. 29 is a third schematic view of the cooperation of the movable contact piece and the first arc barrier in the relay provided in the fourth embodiment of the present disclosure; FIG. 30 is a sectional view taken along part B3-B3 of FIG. 29; FIG. 31 is an enlarged partial view of part B4 of FIG. 29; FIG. 32 is a second exploded schematic view of the relay provided in the fourth embodiment of the present disclosure; FIG. 33 is a first schematic structural view of the movable contact piece in the relay provided in the fourth embodiment of the present disclosure; FIG. 34 is a second exploded schematic view of the movable contact piece in the relay provided in the fourth embodiment of the present disclosure; FIG. 35 is a second schematic structural view of the relay provided in the fourth embodiment of the present disclosure; FIG. 36 is a schematic structural view of a contact container in the relay provided in the fourth embodiment of the present disclosure; FIG. 37 is a schematic structural view of a push rod unit in the relay provided in the fourth embodiment of the present disclosure; FIG. 38 is a first schematic structural view of a movable contact piece in a relay provided in a fifth embodiment of the present disclosure; FIG. 39 is a second schematic structural view of the movable contact piece in the relay provided in the fifth embodiment of the present disclosure; FIG. 40 is a third schematic structural view of the movable contact piece in the relay provided in the fifth embodiment of the present disclosure; FIG. 41 is a fourth schematic structural view of a movable contact piece in the relay provided in the fifth embodiment of the present disclosure; FIG. 42 is a fifth schematic structural view of the movable contact piece in the relay provided in the fifth embodiment of the present disclosure; FIG. 43 is a sixth schematic structural view of the movable contact piece in the relay provided in the fifth embodiment of the present disclosure; FIG. 44 is a first schematic structural view of the movable contact piece in a relay provided in a sixth embodiment of the present disclosure; FIG. 45 is a second schematic structural view of the movable contact piece in the relay provided in the sixth embodiment of the present disclosure. FIG. 46 is a first schematic structural view of a relay provided in a seventh embodiment of the present disclosure; FIG. 47 is a sectional view taken along line A3-A3 of FIG. 46; FIG. 48 is a first exploded schematic view of the relay provided in the seventh embodiment of the present disclosure; FIG. 49 is a first schematic view of cooperation of a stationary contact leading-out terminal and a first arc barrier in the relay provided in the seventh embodiment of the present disclosure; FIG. 50 is a second schematic view of the cooperation of the stationary contact leading-out terminal and the first arc barrier in the relay provided in the seventh embodiment of the present disclosure; FIG. 51 is a sectional view taken along part C2-C2 of FIG. 50; FIG. 52 is an enlarged partial view of the first arc barrier as shown in FIG. 47; FIG. 53 is a first schematic view of the cooperation of the movable contact piece and the second arc barrier in the relay provided in the seventh embodiment of the present disclosure; FIG. 54 is a second schematic view of the cooperation of the movable contact piece and the second arc barrier in the relay provided in the seventh embodiment of the present disclosure; FIG. 55 is a sectional view at part B5-B5 in FIG. 54; FIG. 56 is an enlarged partial view at part B6 of FIG. 54; FIG. 57 is a third schematic view of the cooperation of the movable contact piece and the second arc barrier in the relay provided in the seventh embodiment of the present disclosure; FIG. 58 is a sectional view at part B7-B7 in FIG. 57; FIG. 59 is an enlarged partial view at part B8 of FIG. 57; FIG. 60 is a second exploded schematic view of the relay provided in the seventh embodiment of the present disclosure; FIG. 61 is a first exploded schematic view of the movable contact piece in the relay provided in the seventh embodiment of the present disclosure; FIG. 62 is a second schematic structural view of the movable contact piece in the relay provided in the seventh embodiment of the present disclosure; FIG. 63 is a schematic structural view of the relay provided in the seventh embodiment of the present disclosure; FIG. 64 is a schematic structural view of a contact container in the relay provided in the seventh embodiment of the present disclosure; FIG. 65 is a first schematic structural view of a movable contact piece in a relay provided in an eighth embodiment of the present disclosure; FIG. 66 is a second schematic structural view of the movable contact piece in the relay provided in the eighth embodiment of the present disclosure; FIG. 67 is a third schematic structural view of the movable contact piece in the relay provided in the eighth embodiment of the present disclosure; FIG. 68 is a fourth schematic structural view of a movable contact piece in the relay provided in the eighth embodiment of the present disclosure; FIG. 69 is a fifth schematic structural view of the movable contact piece in the relay provided in the eighth embodiment of the present disclosure; FIG. 70 is a sixth schematic structural view of the movable contact piece in the relay provided in the eighth embodiment of the present disclosure; FIG. 71 is a first schematic structural view of the movable contact piece in a relay provided in a third embodiment of the present disclosure; FIG. 72 is a second schematic structural view of the movable contact piece in the relay provided in the third embodiment of the present disclosure. The reference numerals are as follows: 1. contact container; 2. contact assembly; 4. push assembly; 5. arc extinguishing unit; 6, 7. first arc barrier; 8. second arc barrier; 11. insulating cover; 111. through hole; 12. frame piece; 21. stationary contact leading-out terminal; 211. fitting part; 22. movable contact piece; 221. thrust part; 2211. through hole; 220. first contact part; 222. first arc barrier groove; 223. mounting groove; 2231. first mounting portion; 2232. fixing portion; 2233. second mounting portion; 225. arc barrier rib; 31. upper magnetic conductor; 32. lower magnetic conductor; 41. push rod unit; 411. push rod; 412. limiting protrusion; 413. base; 42. U-shaped bracket; 421. limiting hole; 43. elastic member; 44. electromagnet unit; 441. coil bobbin; 442. coil; 443. movable core; 444. stationary core; 445. U-shaped yoke; 446. magnetic sleeve; 447. spring; 51. arc extinguishing magnet; 52. yoke clamp; 60, 72. first gap; 61, 71. first step; 62. positioning part; 63, 73. first guiding gap; 70. column; 74. limiting part; 75. arc barrier ring; 76. connecting part; 81. second step; 82. second gap; 83. second guiding gap. DETAILED DESCRIPTION

[0034] The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below in connection with the accompanying drawings in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are for illustrative purposes only, and are not intended to limit the protection scope of the present disclosure. Therefore, it should be understood that various modifications and changes may be made to the exemplary embodiments without departing from the protection scope of the present disclosure.

[0035] In the description of the present disclosure, unless otherwise explicitly specified and limited, the terms "first" and "second" are used for descriptive purposes only, and shall not be construed as indicating or implying relative importance; the term "a plurality of" refers to two or more; the term "and / or" includes any combination and all combinations of one or more of the associated listed items. In particular, reference to "the" object or "a" object is also intended to mean one of a possible plurality of such objects.

[0036] Unless otherwise specified or stated, the terms "connect", "fix" and the like shall be understood in a broad sense. For example, "connection" may be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" may be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0037] Furthermore, in the description of the present disclosure, it should be understood that directional terms such as "upper", "lower", "inner" and "outer" described in the exemplary embodiments of the present disclosure are described from angles shown in the accompanying drawings, and shall not be construed as limiting the exemplary embodiments of the present disclosure. It should also be understood that in the context, when an element or feature is mentioned to be connected "on", "under", "inside" or "outside" another element (one or more), it can be directly connected "on", "under", "inside" or "outside" the other element (one or more), or indirectly connected "on", "under", "inside" or "outside" the other element (one or more) through an intermediate element.

[0038] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, exemplary embodiments can be implemented in various forms, and shall not be construed as limiting the embodiments set forth herein; on the contrary, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the figures denote the same or similar structures, and thus their detailed descriptions will be omitted.First Embodiment

[0039] The present embodiment provides a contact unit. As shown in FIGS. 1-2, the contact unit includes a movable contact piece 22 and a pair of stationary contact leading-out terminals 21. The movable contact piece 22 is configured to contact with or separate from the pair of stationary contact leading-out terminals 21.

[0040] In the contact unit provided by the present embodiment, the movable contact piece 22 is contacted with or separated from the pair of stationary contact leading-out terminals 21. When the movable contact piece 22 comes into contact with stationary contacts at the bottom of the pair of stationary contact leading-out terminals 21, current flows in from one stationary contact leading-out terminal 21, passes through the movable contact piece 22 and then flows out of the other stationary contact leading-out terminal 21, thereby connecting a load.

[0041] In one embodiment, the stationary contact is provided at the bottom of the stationary contact leading-out terminal 21. The stationary contact leading-out terminal 21 and the stationary contact are integrally or separately formed.

[0042] Specifically, the bottom of the stationary contact leading-out terminal 21 can directly serve as the stationary contact, or the stationary contact can be disposed at the bottom of the stationary contact leading-out terminal 21 integrally or separately.

[0043] When the movable contact piece 22 is separated from the stationary contacts at the bottom of the pair of stationary contact leading-out terminals 21, along with the separation of the movable and stationary contacts between the movable contact piece 22 and the stationary contact leading-out terminals 21 and a magnetic blow arc-pulling, if the arc is pulled to a certain extent, the arc will be extinguished automatically; if the arc is not stable enough at the movable and stationary contacts and transfers on the surface of the movable contact piece 22 or the stationary contact leading-out terminal 21, the arc cannot be extinguished mainly along the magnetic blow-out arc pulling path, eventually resulting in failure to break the arc and even explosion and burnout of the relay.

[0044] In order to solve this problem, as shown in FIGS. 2-5, the contact unit provided by the present embodiment further includes an arc barrier structure, which is disposed outside the stationary contact leading-out terminal 21 and configured to impede arc transfer.

[0045] The arc barrier structure is disposed outside the stationary contact leading-out terminal. When the arc moves up and down along the outer wall of the stationary contact leading-out terminal 21 under the action of the magnetic field, and under the action of the arc barrier structure, a risk of arc ablation on the side wall of the stationary contact leading-out terminal 21 may be reduced.

[0046] Specifically, as shown in FIGS. 5-6, the arc barrier structure provided by the present embodiment includes a first arc barrier 6, which is disposed outside the stationary contact leading-out terminal 21. A first step 61 and / or a first gap 60 is provided between the first arc barrier 6 and the stationary contact leading-out terminal 21, to impede arc transfer.

[0047] In the arc barrier structure provided by the present embodiment, the first step 61 and / or the first gap 60 is provided at a position where the first arc barrier 6 is in contact with the stationary contact leading-out terminal 21 and on a moving path of the arc, that is, a bend is formed on the arc path, which can consume the kinetic energy of the arc and better block the arc transfer. The arc has two transfer directions: first, the first step 61 and the first gap 60 can block the arc from transferring toward the direction in which the pair of stationary contact leading-out terminals 21 face each other, to avoid the occurrence of arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21; second, the first step 61 and the first gap 60 can block the arc from transferring upward along the outer wall of the stationary contact leading-out terminal 21 toward a direction away from the movable contact piece 22, further reduce the ablation of the outer wall of the stationary contact leading-out terminal 21 by the arc, improve the arc extinguishing capability and effect, and thus improve the interruption capability between the movable contact and the stationary contact corresponding to the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0048] In one embodiment, the first arc barrier 6 is made of an insulating material.

[0049] Specifically, the first arc barrier 6 may be made of insulating materials such as ceramics, glass, rubber or plastic. The first arc barrier 6 made of insulating material has good arc extinguishing or arc cooling performance, with strong arc extinguishing capability and favorable arc extinguishing effect.

[0050] It can be understood that in some other embodiments, the first arc barrier 6 may also be made of metal materials.

[0051] In one embodiment, the first arc barrier 6 is sleeved outside the stationary contact leading-out terminal 21.

[0052] The first arc barrier 6 may also be an arc barrier sleeve. The first arc barrier 6 is sleeved outside the stationary contact leading-out terminal 21 to perform arc isolation treatment on the outer peripheral side of the contact area corresponding to the stationary contact of the stationary contact leading-out terminal 21, which can achieve more comprehensive arc isolation, and is conducive to arc extinguishing.

[0053] It should be particularly noted that the first arc barrier 6 is sleeved on the stationary contact leading-out terminal 21, and the first arc barrier 6 includes but is not limited to cylindrical, elliptical cylindrical, square cylindrical, polygonal cylindrical and other shapes.

[0054] In one embodiment, the first arc barrier 6 is a closed ring structure arranged around the stationary contact leading-out terminal 21; or, the first arc barrier 6 is distributed in an annular shape and at intervals around the stationary contact leading-out terminal 21.

[0055] Specifically, the first arc barrier 6 may be of an integrated structure. For example, the first arc barrier 6 is integrally cylindrical or annular and sleeved outside the stationary contact leading-out terminal 21. The integrated structure is provided to reduce the assembly process of parts and has relatively low production costs.

[0056] In addition, the first arc barrier 6 may also be of a separated structure. The first arc barrier 6 includes a plurality of insulating monomers, which are arranged along a circumferential direction of the stationary contact leading-out terminal 21 and can be connected end to end into cylindrical, polygonal cylindrical and other structures. In some other embodiments, the plurality of insulating monomers may also be distributed around the stationary contact leading-out terminal 21 and in an annular shape with intervals therebetween, or a single insulating monomer may be arranged outside the stationary contact leading-out terminal 21. As long as the insulating and arc extinguishing effects can be achieved, no limitation is imposed herein in this embodiment.

[0057] In one embodiment, as shown in FIG. 6, the outer peripheral wall of the first arc barrier 6 protrudes beyond the outer peripheral wall of the stationary contact leading-out terminal 21. A first step 61 is formed between the bottom wall of the first arc barrier 6 and an outer peripheral wall of a corresponding stationary contact leading-out terminal 21.

[0058] The outer peripheral wall of the first arc barrier 6 and the outer peripheral wall of the stationary contact leading-out terminal 21 are not disposed coplanarly, or the first arc barrier 6 is not embedded into the outer peripheral wall of the stationary contact leading-out terminal 21, so that the first step 61 is formed between the bottom wall of the first arc barrier 6 and the outer peripheral wall of the corresponding stationary contact leading-out terminal 21. The first step 61 is closer to an are initiation point, to limit the upward movement of the arc along the surface of the stationary contact leading-out terminal 21, so as to reduce the ablation on the outer peripheral wall of the stationary contact leading-out terminal 21 and the ablation in the direction away from the movable contact piece 22, and achieve the purpose of consuming arc energy.

[0059] The outer peripheral wall of the first arc barrier 6 protrudes beyond the outer peripheral wall of the stationary contact.

[0060] The outer peripheral wall of the first arc barrier 6 protrudes from the outer peripheral wall of the stationary contact, and the stationary contact is located below the first arc barrier 6, so that the first step 61 is formed between the bottom wall of the first arc barrier 6 and the outer peripheral wall of the corresponding stationary contact. The first step 61 is closer to the are initiation point, to reduce the ablation on the outer peripheral wall of the stationary contact leading-out terminal 21 by the arc and the ablation in the direction away from the movable contact piece 22, so as to realize the protection of the stationary contact leading-out terminal 21.

[0061] In one embodiment, as shown in FIG. 6, the first gap 60 is provided between the inner wall at the bottom of the first arc barrier 6 and the outer wall of the stationary contact leading-out terminal 21. Specifically, the first gap 60 is provided between the inner peripheral wall at the bottom of the first arc barrier 6 and the outer peripheral wall at the bottom of the stationary contact leading-out terminal 21.

[0062] A connection between the bottom end face and the inner wall face of the first arc barrier 6 is an edge. The arc moves to the edge to form an arc concentration. Meanwhile, due to the existence of the first gap 60, part of the arc can enter the first gap 60, resulting in a height drop on the arc transfer path. This drop prevents the arc from moving easily in the direction away from the movable contact piece 22, and the combination of the edge and the drop impedes arc transfer.

[0063] In one embodiment, one end of the first gap 60 facing the movable contact piece 22 is provided with an open end and one end of the first gap away from the movable contact piece 22 is provided with a closed end.

[0064] The open end of the first gap 60 is used for introducing the arc, and the first gap 60 has a closed end, so that the first gap 60 is not a fully penetrating structure, thus a bend may be formed on the arc path.

[0065] It should be particularly noted that the arc barrier structure provided in this embodiment may include the first arc barrier 6, the first step 61 and the first gap 60. The first step 61 and the first gap 60 form a part of the arc barrier structure, which is used to restrict the arc from transferring along the stationary contact leading-out terminal 21 in the direction away from the movable contact piece 22 and restrict the arc from transferring toward a center line of the movable contact piece 22. The first arc barrier 6 made of insulating material has the performance of arc interruption or arc cooling, to achieve the arc extinguishing effect.

[0066] In one embodiment, as shown in FIG. 6, the inner wall of the first arc barrier 6 is provided with a positioning part 62 and the outer wall of the stationary contact leading-out terminal 21 is provided with a fitting part 211. The positioning part 62 is engaged with the fitting part 211.

[0067] When the first arc barrier 6 is mounted to the stationary contact leading-out terminal 21, the positioning part 62 and the fitting part 211 can perform initial positioning on the first arc barrier 6, to improve the mounting accuracy of the first arc barrier 6. Meanwhile, the positioning part 62 is engaged with the fitting part 211 to fix the first arc barrier 6 and prevent the first arc barrier 6 from falling off.

[0068] The positioning part 62 and the fitting part 211 may be a stop step, an annular positioning groove or a positioning protrusion, etc arranged on the stationary contact leading-out terminal 21. For example, the positioning part 62 is an annular clamping block arranged on the inner wall of the first arc barrier 6, the fitting part 211 is an annular clamping groove arranged on the outer wall of the stationary contact leading-out terminal 21, and the annular clamping block is engaged with the annular clamping groove. The positioning part 62 and the fitting part 211 provided in this embodiment are not limited to other forms, and any structures that can realize the positioning and fixing of the first arc barrier 6 relative to the stationary contact leading-out terminal 21 may be within the protection scope of this embodiment.

[0069] In some other embodiments, the positioning part may be disposed on the outer wall of the stationary contact leading-out terminal 21, and correspondingly, the fitting part is disposed on the inner wall of the first arc barrier 6.

[0070] In one embodiment, as shown in FIG. 6, a first guiding gap 63 is provided between an inner wall at a top of one end of the first arc barrier 6 away from the movable contact piece 22 and the outer wall of the corresponding stationary contact leading-out terminal 21, and the first guiding gap 63 is configured to guide the stationary contact leading-out terminal 21.

[0071] Since the first arc barrier 6 needs to be sleeved on the outer wall of the stationary contact leading-out terminal 21 from the bottom of the stationary contact leading-out terminal 21 when the first arc barrier 6 is mounted to the stationary contact leading-out terminal 21, the inner wall at the top of the first arc barrier 6 and the outer wall of the stationary contact leading-out terminal 21 are not attached to each other. The first guiding gap 63 is provided between the inner wall at the top of the first arc barrier 6 and the outer wall of the stationary contact leading-out terminal 21, and the first guiding gap 63 is used to guide the first arc barrier 6, thereby facilitating the installation of the first arc barrier 6.

[0072] It can be understood that the first guiding gap 63 may be of a horn-shaped structure, a large opening end of the first gap 60 is disposed away from the movable contact piece 22, and the large opening end of the first gap 60 provides an entrance through which the bottom of the stationary contact leading-out terminal 21 may pass, which further improves the convenience of installing the first arc barrier 6.

[0073] It should be particularly noted that in some other embodiments, a second arc barrier (not shown) may also be disposed outside the movable contact piece 22 to impede arc transfer.

[0074] In one embodiment, the contact unit provided in this embodiment further includes a contact container 1 (as shown in FIGS. 1-2). The contact container 1 includes an insulating cover 11, the movable contact piece 22 is movably disposed within the insulating cover 11, and the stationary contact leading-out terminal 21 is inserted into the insulating cover 11 and is at least partially disposed within the insulating cover 11.

[0075] The contact container 1 further includes a frame piece 12, the insulating cover 11 is connected to a yoke plate through the frame piece 12, and the insulating cover 11 and the yoke plate enclose a contact chamber. The contact chamber provides an arc isolation environment for the contact between the movable contact piece 22 and the stationary contact leading-out terminal 21, ensuring the reliability of the relay in use.

[0076] Certainly, in some other embodiments, the fitting part 211 may also be disposed on the inner wall of the insulating cover 11. Since the stationary contact leading-out terminal 21 partially extends into the insulating cover 11, the limiting of the first arc barrier 6 can also be achieved.

[0077] In one embodiment, the first arc barrier 6 is disposed outside the portion of the stationary contact leading-out terminal 21 located inside the insulating cover 11. The first arc barrier 6 isolates and protects the portion of the stationary contact leading-out terminal 21 located inside the insulating cover 11.

[0078] In one embodiment, a through hole 111 is provided at a top of the insulating cover 11, the stationary contact leading-out terminal 21 is disposed through the through hole 111, and a diameter of the outer peripheral wall of the first arc barrier 6 is less than or equal to a diameter of the through hole 111.

[0079] The through hole 111 of the insulating cover 11 provides a space through which the stationary contact leading-out terminal 21 may pass, and the diameter of the outer peripheral wall of the first arc barrier 6 is less than or equal to the diameter of the through hole 111, so that the first arc barrier 6 may at least partially shield the through hole 111 of the insulating cover 11, preventing arc splashes from entering the gap between the stationary contact leading-out terminal 21 and the through hole 111, so as to solve the problem of arc ablation splashing and contaminating the inner wall of the insulating cover 11, and increase an arc creepage distance and insulation resistance.

[0080] It can be understood that an outer contour of the first arc barrier 6 provided in this embodiment may be larger than the diameter of the through hole 111 of the top wall of the insulating cover 11, but is not necessarily larger than the through hole 111 on the top wall of the insulating cover 11; instead, the first step 61 and the first gap 60 formed between the bottom end of the first arc barrier 6 and the stationary contact leading-out terminal are used to block the transfer of the arc or an arc root.

[0081] In one embodiment, as shown in FIGS. 2 and 7, a side of the movable contact piece 22 facing the stationary contact leading-out terminal 21 is a top surface of the movable contact piece 22. An arc barrier portion is provided on the top surface of the movable contact piece 22 and is configured to impede the movement of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other.

[0082] The arc barrier portion is disposed on the top surface of the movable contact piece 22 to impede the transfer of the arc along the top surface of the movable contact piece 22, thereby isolating and cutting off the transfer path of the arc on the top surface of the movable contact piece 22, and impeding the transfer of the arc toward a center line of the movable contact piece 22 in a length direction, avoiding the arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, enabling the arc to be extinguished efficiently along the originally set arc extinguishing path of the magnetic blow-out field, and improving the arc extinguishing capability.

[0083] In one embodiment, the arc barrier portion is disposed between the inner edges of the two first contact parts 220 of the movable contact piece 22.

[0084] A portion where the movable contact piece 22 is in contact with the pair of stationary contact leading-out terminals 21 is the first contact part 220, and the arc barrier portion is disposed between the inner edges of the two first contact parts 220, to cut off the path of arc transferring toward an inner side of the stationary contact leading-out terminals 21, avoid the arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, and ensure the high efficiency and thoroughness of arc extinguishing.

[0085] It should be particularly noted that the inner side specifically refers to a side where the pair of stationary contact leading-out terminals 21 face each other (as shown in FIG. 2, Q refers to a direction in which the pair of stationary contact leading-out terminals 21 face each other, and M refers to the center line of the stationary contact leading-out terminals 21), or a side close to the center line W of the movable contact piece 22 in the length direction (as shown in FIG. 7, L refers to a length direction of the movable contact piece 22, and T refers to a width direction of the movable contact piece 22). Therefore, the arc barrier portion is disposed at the side of the first contact part 220 facing the inner side.

[0086] It can be understood that at least part of the first step 61 and / or the first gap 60 is disposed between the inner edges of the first contact part 220.

[0087] In one embodiment, as shown in FIGS. 7-8, the number of the arc barrier portions is two, the two arc barrier portions are arranged corresponding to the pair of stationary contact leading-out terminals 21, and a distance between the outer edges of the two arc barrier portions along the length direction of the movable contact piece 22 is less than or equal to a distance between the inner edges of the first contact part 220.

[0088] Specifically, since the number of the stationary contact leading-out terminals 21 is two, the two arc barrier portions are arranged corresponding to the two stationary contact leading-out terminals 21 and disposed at the inner side of the stationary contact leading-out terminals 21, so that the arc generated by the separation of the two sets of movable and stationary contacts is blocked through the two arc barrier portions respectively, playing a dual arc isolation role and further improving the arc isolation effect.

[0089] In one embodiment, as shown in FIG. 7, the arc barrier portion is a first arc barrier groove 222; as shown in FIG. 8, the arc barrier portion is an arc barrier rib 225. In some other embodiments, the movable contact piece 22 may be provided with the first arc barrier groove 222 and the arc barrier rib 225 simultaneously.

[0090] The arc barrier portion is the first arc barrier groove 222, which is a recessed structure provided on the top surface of the movable contact piece 22; the arc barrier portion is the arc barrier rib 225, which is a protruding structure provided on the top surface of the movable contact piece 22. These two structures can solve a problem of rapid arc transfer that may occur on the movable contact piece 22 with the top surface being a plane. The first arc barrier groove 222 and / or the arc barrier rib 225 can isolate and cut off the path of the arc transferring on the top surface of the movable contact piece 22, and impede the transfer of the arc toward the center line of the movable contact piece 22 in the length direction, avoiding arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21.

[0091] Specifically, the first arc barrier groove 222 includes a first groove wall and a first groove bottom that are connected to each other. The arc root moves to the connection between the first groove wall and the top surface of the movable contact piece 22 to form an arc concentration. A height difference between the top surface of one side of the movable contact piece 22 facing the stationary contact leading-out terminal 21 and the first groove bottom is used to impede the movement of the arc root toward the direction in which the pair of stationary contact leading-out terminals 21 face each other.

[0092] Since the first arc barrier groove 222 has a first groove wall and a first groove bottom connected with each other, the connection between the first groove wall and the top surface of the movable contact piece 22 is an edge. The arc root moves to the edge to form the arc concentration. Meanwhile, the height difference between the top surface of the movable contact piece 22 and the first groove bottom creates a drop on the arc transfer path, which can prevent the arc from easily moving toward the center line of the movable contact piece 22 in the length direction, and the combination of the edge and the drop can improve the arc extinguishing effect.

[0093] In one embodiment, the first arc barrier groove 222 is a through groove extending along a width direction of the movable contact piece 22.

[0094] If the first arc barrier groove 222 extends along the length direction of the movable contact piece 22, the arc may transfer along the portion of the top surface of the movable contact piece 22 where the first arc barrier groove 222 is not provided, resulting in a risk of arc short-circuit. Therefore, the first arc barrier groove 222 is configured as a through groove along the width direction of the movable contact piece 22. Since the through groove is arranged to penetrate the width direction of the movable contact piece 22, after the arc enters the first arc barrier groove 222, the transfer path of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other is completely cut off.

[0095] In one embodiment, the first arc barrier groove 222 has an arc-shaped structure, and the first arc barrier groove 222 is arranged around the stationary contact leading-out terminal 21.

[0096] Specifically, since the bottom of the stationary contact leading-out terminal 21 is similar to a cylindrical structure, the shape of the first arc barrier groove 222 is adapted to an outer contour of the bottom of the stationary contact leading-out terminal 21. The first arc barrier groove 222 with the arc-shaped structure is arranged along the outer contour of the stationary contact leading-out terminal 21 and around the stationary contact leading-out terminal 21, to impede the arc transfer path in all directions.

[0097] It can be understood that the first arc barrier groove 222 with the arc-shaped structure extends from one side to the other side of the movable contact piece 22 along the width direction, so that contact parts are formed on the portions at both ends of the movable contact piece 22 along the length direction where the first arc barrier groove 222 is not provided, and the contact parts are used for contacting the stationary contact leading-out terminal 21.

[0098] It should be particularly noted that, as shown in FIGS. 7-8, the first arc barrier groove 222 may be replaced by the arc barrier rib 225, and the arrangement position and shape of the arc barrier rib 225 are similar to those of the first arc barrier groove 222, which will not be repeated.

[0099] This embodiment also provides a relay, including the contact unit described above.

[0100] In the relay provided in this embodiment, the movable contact piece 22 and the pair of stationary contact leading-out terminals 21 of the contact unit are contacted with or separated from one another. When the movable contact piece 22 comes into contact with the stationary contacts at the bottom of the pair of stationary contact leading-out terminals 21, current flows in from one stationary contact leading-out terminal 21, passes through the movable contact piece 22 and then flows out of the other stationary contact leading-out terminal 21, thereby connecting the load.

[0101] In one embodiment, as shown in FIGS. 9-13, the relay further includes a push assembly 4, which includes a push rod unit 41, an elastic member 43 and a U-shaped bracket 42. The push rod unit 41 includes a base 413 and a push rod 411, and the base 413 and an upper part of the push rod 411 may be integrally injection-molded. The U-shaped bracket 42 and the base 413 enclose a frame structure, the movable contact piece 22 and the elastic member 43 are mounted within the frame structure enclosed by the U-shaped bracket 42 and the base 413. One end of the elastic member 43 abuts against the base 413, and the other end of the elastic member 43 abuts against the movable contact piece 22. The elastic member 43 may provide an elastic force, so that the movable contact piece 22 has a tendency to move away from the base 413 and approach the stationary contact leading-out terminal 21.

[0102] Specifically, the push rod unit 41 and the U-shaped bracket 42 are matched through the limiting protrusion 412 and the limiting hole. A moving force of the push rod unit 41 may be transmitted to the U-shaped bracket 42 for driving the movement of the movable contact piece 22, so that the movable contact piece 22 can be contacted with or separated from the pair of stationary contact leading-out terminals 21.

[0103] As shown in FIGS. 9-13, the push assembly 4 of the relay further includes an electromagnet unit 44, which is disposed at a side of a yoke plate facing away from the insulating cover 11. The push rod unit 41 is drivenly connected to the electromagnet unit 44, and the push rod unit 41 is movably disposed in a driving chamber enclosed by a metal cover and the yoke plate, and abuts against the movable contact piece 22 through a via hole of the yoke plate. When the electromagnet unit 44 is energized,the push rod unit 41 may be driven to move, to further drive the movable contact piece 22 to move, so as to contact with or separate from the stationary contact leading-out terminal 21.

[0104] The electromagnet unit 44 includes a coil bobbin 441, a coil 442, a stationary core (not shown), a movable core 443, a U-shaped yoke 445, a magnetic sleeve 446 and a spring 447. The coil bobbin 441 is disposed within the U-shaped yoke 445, the coil bobbin 441 is in a hollow cylindrical shape and made of an insulating material. The magnetic sleeve 446 is inserted into the coil bobbin 441, and the coil 442 is wound around the coil bobbin 441. The stationary core is provided with a first through hole that is arranged corresponding to the via hole of the yoke plate, through which the push rod unit 41 may pass. The movable core 443 is movably disposed within the magnetic sleeve 446 and arranged opposite to the stationary core. The spring 447 is disposed between the stationary core and the movable core 443 and is capable of abutting against each of them. The movable core 443 is connected to the push rod unit 41 and configured to be attracted by the stationary core when the coil 442 is energized. The movable core 443 and the push rod unit 41 may be connected by screwing, riveting, welding or other means.

[0105] The working process of the relay provided in this embodiment is as follows:

[0106] When the coil 442 is energized, the stationary core 444 attracts the movable core 443, the movable core 443 drives the push rod unit 41 to move upward, the spring 447 between the stationary core 444 and the movable core 443 is compressed, and the push rod unit 41 pushes the movable contact piece 22 to move by means of the U-shaped bracket 42 and the elastic member 43, so that the two ends of the movable contact piece 22 are respectively in contact with the two stationary contact leading-out terminals 21, to close the movable and stationary contacts.

[0107] When the current of the coil 442 is interrupted, the stationary core releases the attraction to the movable core 443. Under the elastic force of the compressed spring 447, the movable core 443 drives the push rod unit 41 to move downward, so that the movable contacts at the two ends of the movable contact piece 22 are separated from the two stationary contact leading-out terminals 21, to separate the movable and stationary contacts.

[0108] When the short-circuit load is large, under the action of the short-circuit current, an electro-dynamic repulsive force may be generated between the movable contact piece 22 and the stationary contact leading-out terminal 21, causing the contacts to bounce open, resulting in arc generation between the contacts and severe combustion thereof, and even causing an explosion.

[0109] For this purpose, the relay provided in this embodiment further includes an anti-short circuit assembly, which is disposed at least at the upper side of the movable contact piece 22 along an axial direction of the stationary contact leading-out terminal 21, and generates an attractive force when a high fault current occurs in the movable contact piece 22, to resist the electro-dynamic repulsive force between the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0110] The anti-short circuit assembly may also be a short-circuit ring disposed between the pair of stationary contact leading-out terminals 21. For a high-voltage DC relay, the first arc barrier 6 may prevent the arc from being attracted by the anti-short circuit assembly 3 to move toward the direction in which the pair of stationary contact leading-out terminals 21 face each other, thus avoiding the reduction of insulation between the contacts or arc short-circuit.

[0111] In one embodiment, as shown in FIGS. 9-10, the relay further includes an arc extinguishing unit 5, which is disposed within a hollow chamber of the housing and configured to extinguish the arc of the contact assembly 2. The arc extinguishing unit 5 includes two arc extinguishing magnets 51. The arc extinguishing magnets 51 may be permanent magnets, and each arc extinguishing magnet 51 may substantially be a cuboid. The two arc extinguishing magnets 51 are respectively disposed at both sides of the insulating cover 11 and oppositely arranged along the length direction of the movable contact piece 22.

[0112] In this embodiment, the two arc extinguishing magnets 51 are respectively located on the left and right sides of the insulating cover 11. The surfaces facing each other of the two arc extinguishing magnets 51 have opposite polarities. That is to say, a left surface of the arc extinguishing magnet 51 at the left side of the insulating cover 11 is an S pole and a right surface thereof is an N pole, and the left surface of the arc extinguishing magnet 51 at the right side of the insulating cover 11 is an S pole and the right surface thereof is an N pole.

[0113] Certainly, the surfaces facing each other of the two arc extinguishing magnets 51 may also be designed to have the same polarity. For example, the left surface of the arc extinguishing magnet 51 at the left side of the insulating cover 11 is an S pole and the right surface thereof is an N pole, and the left surface of the arc extinguishing magnet 51 at the right side of the insulating cover 11 is an N pole and the right surface thereof is an S pole.

[0114] In this way, by arranging two oppositely disposed arc extinguishing magnets 51, a magnetic field may be formed around the contact assembly 2.

[0115] Therefore, the arc generated between the stationary contact leading-out terminal 21 and the movable contact piece 22 may be elongated in the direction away from each other under the action of the magnetic field, thereby realizing arc extinguishing.

[0116] As shown in FIGS. 9-13, the arc extinguishing unit 5 further includes two yoke clamps 52, which are arranged in positions corresponding to the two arc extinguishing magnets 51. Moreover, the two yoke clamps 52 surround the insulating cover 11 and the two arc extinguishing magnets 51. The design of the yoke clamps 52 surrounding the arc extinguishing magnets 51 can prevent the magnetic field generated by the arc extinguishing magnets 51 from diffusing outward and affecting the arc extinguishing effect. The yoke clamps 52 are made of soft magnetic materials. The soft magnetic materials may include but are not limited to iron, cobalt, nickel and the alloys thereof, etc.Second Embodiment

[0117] This embodiment is similar to the first embodiment, with the difference in the structure of the first arc barrier groove 222.

[0118] As shown in FIGS. 14-16, the first arc barrier groove 222 provided in this embodiment has at least one of a linear structure, a convex structure and an X-shaped structure.

[0119] Specifically, as shown in FIG. 14, the first arc barrier groove 222 is of a linear structure with a simple structure and convenient production and processing. Moreover, since a width of the first arc barrier groove 222 along the length direction of the movable contact piece 22 is relatively narrow, the overall structural strength of the movable contact piece 22 is relatively high.

[0120] As shown in FIG. 15, the first arc barrier groove 222 has a convex structure, so that the first arc barrier groove 222 has a broken-line groove structure, which increases the tortuosity of the transfer path of the arc root, thereby improving the arc extinguishing effect.

[0121] As shown in FIG. 16, the first arc barrier groove 222 has an X-shaped structure. The X-shaped structure includes two intersecting linear grooves, so that the arc roots at each side can be blocked by the transfer path through the two linear grooves , playing a dual arc isolation role with good isolation and arc extinguishing effects.

[0122] It can be understood that the two first arc barrier grooves 222 in this embodiment may have the same or different shapes. For example, one of the first arc barrier grooves 222 has a convex structure, and the other of the first arc barrier grooves 222 has a linear structure.

[0123] It can be understood that the first arc barrier groove 222 provided in this embodiment includes but is not limited to the linear structure and the X-shaped structure, and may also have an S-shaped structure, a tapered structure, etc. Its specific shape can be adjusted according to actual production conditions.

[0124] It should be particularly noted that, as shown in FIGS. 17-19, the first arc barrier groove 222 may be replaced by an arc barrier rib 225, and the arrangement position and shape of the arc barrier rib 225 are similar to those of the first arc barrier groove 222, which will not be repeated.Third Embodiment

[0125] This embodiment is similar to the first embodiment, with the only difference in the quantity and structure of the arc barrier portions.

[0126] As shown in FIGS. 20-21, the number of the arc barrier portions provided in this embodiment is one, and the portions of the movable contact piece 22, which are not provided with the arc barrier portions, are located at both sides along the length direction of the movable contact piece 22 and respectively in contact with the pair of stationary contact leading-out terminals 21.

[0127] Specifically, when the arc barrier portion is the first arc barrier groove 222, since one first arc barrier groove 222 is disposed between the pair of stationary contact leading-out terminals 21, and the width of the first arc barrier groove 222 along the length direction of the movable contact piece 22 is relatively wide, the portions of the movable contact piece 22, which are not provided with the first arc barrier groove 222 and disposed on both ends along the length direction of the movable contact piece 22 are respectively two contact parts. The two contact parts are in contact with the pair of stationary contact leading-out terminals 21 respectively. The arc isolation process for the two sets of movable and stationary contacts can be realized by using one first arc barrier groove 222, which has a simple structure and relatively low production cost.

[0128] In one embodiment, as shown in FIGS. 2 and 20, a distance between the two side edges of the first arc barrier groove 222 along the length direction of the movable contact piece 22 is less than or equal to a distance between the bottoms of the pair of stationary contact leading-out terminals 21.

[0129] Specifically, the width of the first arc barrier groove 222 along the length direction of the movable contact piece 22 extends to a vicinity of the inner side edges of the bottoms of the stationary contact leading-out terminals 21 or is flush with the inner side edges of the bottoms of the stationary contact leading-out terminals 21, so that the edge between the first groove wall of the first arc barrier groove 222 and the top surface of the movable contact piece 22 is as close as possible to the bottoms of the stationary contact leading-out terminals 21. The arc can be concentrated at the edge as soon as possible, and the drop between the top surface of the movable contact piece 22 and the first groove bottom of the first arc barrier groove 222 is utilized to reduce the risk of the arc root transferring toward the center line of the movable contact piece 22.

[0130] It should be particularly noted that, as shown in FIGS. 20-21, the first arc barrier groove 222 may be replaced by the arc barrier rib 225, and the arrangement position and shape of the arc barrier rib 225 are similar to those of the first arc barrier groove 222, which will not be repeated.

[0131] The other embodiments are similar to the first embodiment and the second embodiment, with the difference in that other detailed structures of the movable contact piece 22 are added on the basis of the first embodiment or the second embodiment.

[0132] In the movable contact piece 22 provided in this embodiment, a second arc barrier groove (not shown) may also be provided on the side wall of the movable contact piece 22, and the second arc barrier grooves are configured to impede the movement of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other.

[0133] The second arc barrier grooves are disposed on the side walls of the movable contact piece 22 to impede the arc transfer along the side walls of the movable contact piece 22 toward the center line of the movable contact piece 22 in the length direction, thereby isolating and cutting off the transfer path of the arc on the side walls of the movable contact piece 22, avoiding the arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, enabling the arc to be extinguished efficiently along the originally set arc extinguishing path of the magnetic blow-out field, and improving the arc extinguishing capability.

[0134] In one embodiment, the second arc barrier grooves are disposed between the inner edges of the two first contact parts 220.

[0135] In other words, the second arc barrier portions are disposed at the inner side of the stationary contact leading-out terminals 21, to cut off the transfer path of the arc root toward the inner side of the stationary contact leading-out terminals 21, avoid the arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, and ensure the high efficiency and thoroughness of arc extinguishing.

[0136] In one embodiment, the number of the second arc barrier grooves is multiple, and the multiple second arc barrier grooves are disposed at both sides of the movable contact piece 22 along the length direction of the movable contact piece 22; and / or, the number of the second arc barrier grooves is multiple, and the multiple second arc barrier grooves are disposed at both sides of the movable contact piece 22 along the width direction of the movable contact piece 22.

[0137] For example, the number of the second arc barrier grooves is four, with two second arc barrier grooves provided at each side of the movable contact piece 22 along its length direction, and two second arc barrier grooves provided at each side of the movable contact piece 22 along its width direction. The four second arc barrier grooves are disposed at four corners of a thrust part 221 of the movable contact piece 22, so that the arc root may be isolated by the second arc barrier grooves no matter in which directions the arc transfers along the side walls of the movable contact piece 22, which can improve the arc isolation effect.

[0138] In one embodiment, the second arc barrier groove includes a second groove wall and a second groove bottom that are connected to each other. The arc moves to the connection between the second groove wall and the side wall of the movable contact piece 22 to form an arc concentration. A height difference between the side wall of the movable contact piece 22 and the second groove bottom is used to impede the movement of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other.

[0139] Since the second arc barrier groove has the second groove wall and the second groove bottom connected with each other, the connection between the second groove wall and the side wall of the movable contact piece 22 is an edge. The arc moves to the edge to form an arc concentration. The height difference between the side wall of the movable contact piece 22 and the second groove bottom creates a drop on the arc transfer path along the side wall of the movable contact piece 22, which can prevent the arc from easily moving toward the center line of the movable contact piece 22 in the length direction, and the combination of the edge and the drop can improve the arc extinguishing effect.

[0140] In one embodiment, the second arc barrier groove is a through groove extending along the axial direction of the stationary contact leading-out terminal 21.

[0141] If the second arc barrier groove extends along the length direction of the movable contact piece 22, the arc can transfer along the part of the side wall of the movable contact piece 22 where the second arc barrier groove is not provided, resulting in a risk of arc short-circuit. Therefore, the second arc barrier groove is configured as a through groove extending along an axial direction of the stationary contact leading-out terminal 21. Since the through groove is arranged to penetrate a height direction of the movable contact piece 22, after the arc enters the second arc barrier groove, the transfer path of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other is completely cut off.

[0142] It should be noted herein that the movable contact piece shown in the accompanying drawings and described in the present specification is merely an example used in the principles of the present disclosure. Those skilled in the art should clearly understand that the principles of the present disclosure are not limited to any details or any components of the devices shown in the accompanying drawings or described in the specification.

[0143] Furthermore, the present disclosure also provides an arc barrier structure, a contact unit and a relay with reliable arc interruption and good safety performance.

[0144] According to a first aspect of the present disclosure, there is provided an arc barrier structure, including: a first arc barrier mounted on a movable contact piece, and the movable contact piece is configured to be contacted with or separated from a pair of stationary contact leading-out terminals.

[0145] In some implementations, the first arc barrier is sleeved on the outer wall of the stationary contact leading-out terminal.

[0146] In some implementations, a first step is provided between the first arc barrier and the movable contact piece for impeding the arc transfer; and / or, a first gap is provided between the first arc barrier and the movable contact piece for preventing the arc transfer.

[0147] In some implementations, a portion of the movable contact piece which is in contact with the pair of stationary contact leading-out terminals is a first contact part, and the first step and / or the first gap is disposed between inner edges of the first contact part.

[0148] In some implementations, the first arc barrier comprises a column, and a top surface at one end of the column facing the stationary contact leading-out terminals protrudes from a top surface at one end of the movable contact piece facing the stationary contact leading-out terminals, so that the first step is formed between the top surface of the column and the top surface of the movable contact piece.

[0149] In some implementations, the first gap is disposed along an axial direction of the column.

[0150] In some implementations, one end of the first gap facing the stationary contact leading-out terminals is an open end, and one end of the first gap facing away from the stationary contact leading-out terminals is a closed end.

[0151] In some implementations, a mounting groove is provided on a side wall of the movable contact piece, the column is at least partially disposed within the mounting groove, and the first gap is disposed between the column and the mounting groove.

[0152] In some implementations, the mounting groove comprises a first mounting portion that is disposed at a side of the movable contact piece facing the stationary contact leading-out terminals, the column is disposed through the first mounting portion, and the first gap is disposed between the column and the first mounting portion.

[0153] In some implementations, the mounting groove further comprises a fixing portion that is in communication with the first mounting portion, and the column is engaged with the fixing portion to fix the first arc barrier.

[0154] In some implementations, the mounting groove further comprises a second mounting portion, the second mounting portion is disposed at a side of the movable contact piece away from the stationary contact leading-out terminals, the second mounting portion is in communication with the first mounting portion through the fixing portion, the column is disposed through the second mounting portion, and a first guiding gap is provided between an outer wall of the column and an inner wall of the second mounting portion and configured to guide the column.

[0155] In some implementations, the first arc barrier further comprises a limiting part that is disposed at a side of the column away from the movable contact piece and is capable of abutting against the movable contact piece to limit the column.

[0156] In some implementations, the first arc barrier further comprises an arc barrier ring that wraps an end of the movable contact piece along a length direction of the movable contact piece and at least part of a side wall of the movable contact piece.

[0157] In some implementations, the first arc barrier further comprises a connecting part that is disposed at a bottom of one end of the movable contact piece away from the stationary contact leading-out terminals and is respectively connected to two ends of the arc barrier ring, and the column is disposed on the connecting part.

[0158] According to a second aspect of the present disclosure, a contact unit of the embodiments of the present disclosure includes a movable contact piece, a pair of stationary contact leading-out terminals, and the arc barrier structure as described above. The movable contact piece is configured to be contacted with or separated from the pair of stationary contact leading-out terminals, the arc barrier structure is disposed outside the movable contact piece, and the arc barrier structure is configured to impede arc transfer.

[0159] In some implementations, a side of the movable contact piece facing the stationary contact leading-out terminals is a top surface of the movable contact piece, an arc barrier part is provided on the top surface of the movable contact piece, and the arc barrier part is configured to impede an arc from moving toward a direction in which the pair of stationary contact leading-out terminals face each other.

[0160] In some implementations, the arc barrier part is a first arc barrier groove; and / or, the arc barrier part is an arc barrier rib.

[0161] In some implementations, a portion of the movable contact piece is in contact with the pair of stationary contact leading-out terminals is a first contact part, and the arc barrier part is disposed between inner edges of the first contact part.

[0162] In some implementations, a short-circuit resistant assembly is further included, and the short-circuit resistant assembly is at least disposed at a side of the movable contact piece facing the stationary contact leading-out terminals and generates an attractive force when a high fault current occurs in the movable contact piece to resist an electro-dynamic repulsive force between the movable contact piece and the stationary contact leading-out terminals.

[0163] According to a third aspect of the present disclosure, a relay of the embodiments of the present disclosure includes the contact unit as described above.

[0164] One embodiment of the present disclosure has following advantages or beneficial effects:

[0165] In the arc barrier structure provided by the embodiment of the present disclosure, since the arc is likely to be generated when the stationary contact leading-out terminals are separated from the movable contact piece, the first arc barrier is disposed on the movable contact piece to be close to the arc initiation point, thereby better impeding the arc transfer.

[0166] In the contact unit and the relay provided by the embodiment of the present disclosure, the arc barrier structure is disposed outside the movable contact piece and can impede the arc transfer, thereby reducing a risk of ablation of the movable contact piece by the arc and achieving the protection of the movable contact piece.

[0167] Hereinafter, example embodiments will be described more fully with reference to the accompanying drawings.Fourth Embodiment

[0168] The present embodiment provides a contact unit. As shown in FIGS. 22-23, the contact unit includes a contact assembly 2. The contact assembly 2 includes a movable contact piece 22 and a pair of stationary contact leading-out terminals 21. The movable contact piece 22 is configured to contact with or separate from the pair of stationary contact leading-out terminals 21.

[0169] In the contact unit provided by the present embodiment, the movable contact piece 22 is contacted with or separated from the pair of stationary contact leading-out terminals 21. When the movable contact piece 22 comes into contact with stationary contacts at the bottom of the pair of stationary contact leading-out terminals 21, current flows in from one stationary contact leading-out terminal 21, passes through the movable contact piece 22 and then flows out of the other stationary contact leading-out terminal 21, thereby realizing load connection.

[0170] When the movable contact piece 22 is separated from the stationary contacts at the bottom of the pair of stationary contact leading-out terminals 21, along with the separation of the movable and stationary contacts between the movable contact piece 22 and the stationary contact leading-out terminals 21 and a magnetic blow arc-pulling, if the arc is pulled to a certain extent, the arc will be extinguished automatically; if the arc is not stable enough, it may transfer on the surface of the movable contact piece 22 or the stationary contact leading-out terminal 21, the arc cannot be extinguished mainly along the magnetic blow-out arc pulling path, eventually resulting in failure to break the arc and even explosion and burnout of the relay.

[0171] In order to solve this problem, as shown in FIGS. 23-26, the contact unit provided by the present embodiment further includes an arc barrier structure, which is disposed outside the movable contact piece 22 and configured to impede arc transfer.

[0172] In the contact unit provided in this embodiment, an arc barrier structure is disposed outside the movable contact piece 22, and the arc barrier structure can impede the arc transfer, thereby reducing the risk of ablation of the movable contact piece 22 by the arc and achieving protection of the movable contact piece 22.

[0173] Specifically, as shown in FIG. 25 to FIG. 31, the arc barrier structure provided in this embodiment includes a first arc barrier 7 which is disposed on the movable contact piece 22, and the first arc barrier 7 is configured to impede the arc transfer.

[0174] For the arc barrier structure provided in this embodiment, since an arc is likely to be generated when the stationary contact leading-out terminal 21 is separated from the movable contact piece 22, the first arc barrier 7 is disposed on the movable contact piece 22 to be close to the arc initiation point and better impede the arc transfer.

[0175] A first step 71 is provided between the first arc barrier 7 and the movable contact piece 22, to impede the arc transfer; and / or, a first gap 72 is provided between the first arc barrier 7 and the movable contact piece 22, to impede the arc transfer.

[0176] In the arc barrier structure provided by the present embodiment, the first step 71 and / or the first gap 72 is provided at a position where the first arc barrier 7 is in contact with the movable contact piece 22 and disposed on a moving path of the arc, that is, a bend is formed on the arc path, which can consume the kinetic energy of the arc and better block the arc transfer. The arc has two transfer directions: first, the first step 71 and / or the first gap 72 can block the arc from transferring along the movable contact piece 22 toward the direction in which the pair of stationary contact leading-out terminals 21 face each other, to avoid the occurrence of arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21; second, the first step 71 and / or the first gap 72 can block the arc from transferring downward along the movable contact piece 22 toward a direction away from the stationary contact leading-out terminals 21, further reduce the ablation of the outer wall of the movable contact piece 22 by the arc, improve the arc extinguishing capability and effect, and thus improve the breaking capability between the movable contact and the stationary contact corresponding to the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0177] In one embodiment, the first arc barrier 7 is made of an insulating material.

[0178] Specifically, the first arc barrier 7 may be made of insulating materials such as ceramics, glass, rubber or plastic. The first arc barrier 7 made of the insulating material has good arc extinguishing or arc cooling performance, with strong arc extinguishing capacity and good arc extinguishing effect.

[0179] It can be understood that in some other embodiments, the first arc barrier 7 may also be made of a metal material.

[0180] In one embodiment, the first arc barrier 7 is sleeved on an outer wall of the movable contact piece 22.

[0181] The first arc barrier 7 may also be referred to as an arc barrier sleeve. The first arc barrier 7 is sleeved on the outer wall of the movable contact piece 22 to perform arc isolation treatment on an outer peripheral side of a contact area corresponding to the movable contact of the movable contact piece 22, which can achieve more comprehensive arc isolation and is conducive to arc extinguishing.

[0182] It can be understood that the number of the first arc barriers 7 is two, and the two first arc barriers 7 are respectively disposed at two ends of the movable contact piece 22 along the length direction.

[0183] In this way, the two sets of fixed and movable contacts between the movable contact piece 22 and the stationary contact leading-out terminal 21 correspond to the two first arc barriers 7 respectively, so that each set of fixed and movable contacts may use a corresponding first arc barrier 7 for arc isolation, which can achieve double arc extinguishing and improve the thoroughness of the arc extinguishing.

[0184] In one embodiment, as shown in FIG. 25 to FIG. 31, the first arc barrier 7 includes a column 70. A top surface of the column 70 facing the stationary contact leading-out terminal 21 protrudes from the movable contact piece 22, so that a first step 71 is formed between the top surface of the column 70 and the top surface of the movable contact piece 22.

[0185] Since the top surface of the column 70 in the first arc barrier 7 protrudes from the top surface of the movable contact piece 22, the top of the column 70 and the top surface of the movable contact piece 22 are not disposed coplanarly, or the column 70 is not embedded within the top surface of the movable contact piece 22, thus the first step 71 is formed between the top surface of the movable contact piece 22 and the top of the column 70 extending beyond thereto. The first step 71 is closer to the arc initiation point, thereby isolating and cutting off a transfer path of the arc on the top surface of the movable contact piece 22 and impeding the arc from transferring to a center line of the movable contact piece 22 along the length direction, avoiding the short circuit of the arc generated by the two sets of fixed and movable contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, enabling the arc to be extinguished efficiently on the originally set arc extinguishing path of the magnetic blow-out field and improving the arc extinguishing capacity.

[0186] In one embodiment, as shown in FIG. 25 to FIG. 31, a mounting groove 223 is disposed on the side wall of the movable contact piece 22, the column 70 is at least partially disposed within the mounting groove 223, and the first gap 72 is disposed between the column 70 and the mounting groove 223. The first gap 72 is disposed along an axial direction of the column 70.

[0187] The mounting groove 223 is disposed on the side wall of the movable contact piece 22, and the mounting groove 223 not only provides an accommodating space for the column 70 but also functions to mount the column 70. The outer wall of the column 70 and the inner wall of the mounting groove 223 are not attached to each other, and the first gap 72 is disposed between the outer wall of the column 70 and the inner wall of the mounting groove 223. Due to the existence of the first gap 72, a part of the arc can enter the first gap 72. The first gap 72 provides an accommodating space for the arc, which can reduce the risk of the part of the arc transferring along the movable contact piece 22 in the direction away from the stationary contact leading-out terminal 21 and improve the arc extinguishing effect.

[0188] In one embodiment, one end of the first gap 72 facing the stationary contact leading-out terminal 21 is provided with an open end, and one end of the first gap 72 facing away from the stationary contact leading-out terminal 21 is a closed end.

[0189] The open end of the first gap 72 is configured to introduce an arc, and the first gap 72 is provided with a closed end. The first gap 72 is a non-fully penetrating structure, so that a bend may be formed in the arc path.

[0190] In one embodiment, as shown in FIG. 25 to FIG. 31, the mounting groove 223 includes a first mounting portion 2231. The first mounting portion 2231 is disposed at the side of the movable contact piece 22 facing the stationary contact leading-out terminal 21. The column 70 is disposed through the first mounting portion 2231. The first gap 72 is disposed between the column 70 and the first mounting portion 2231.

[0191] The first mounting portion 2231 is disposed on the side wall of the movable contact piece 22 and also on one side of the movable contact piece 22 facing the stationary contact leading-out terminal 21, that is, the first mounting portion 2231 is located at an upper part of the side wall of the movable contact piece 22. The first gap 72 is disposed between the first mounting portion 2231 and the column 70. Since the first gap 72 is closer to a position where the movable contact piece 22 is in contact with the stationary contact leading-out terminal 21, enabling a part of the arc to enter the first gap 72 directly.

[0192] In addition, a connection between the top surface and the side surface of the column 70 is an edge, and the arc moves to the edge to form an arc concentration. Meanwhile, due to the existence of the first gap 72, a part of the arc may enter the first gap 72, resulting in a height drop in the arc transfer path. The drop makes it difficult for the arc to move further toward the direction away from the stationary contact leading-out terminal 21. The combination of the edge and the drop can improve the arc extinguishing effect.

[0193] In one embodiment, the first gap 72 is a horn-shaped structure with a large opening end disposed facing the stationary contact leading-out terminal 21.

[0194] In one embodiment, as shown in FIG. 25 to FIG. 31, the mounting groove 223 further includes a fixing portion 2232. The fixing portion 2232 is in communication with the first mounting portion 2231, and the column 70 is engaged with the fixing portion 2232 to fix the first arc barrier 7.

[0195] Specifically, the column 70 is engaged with the fixing portion 2232, that is, the outer wall of the column 70 is attached to or in an interference fit with the inner wall of the fixing portion 2232. The fixing portion 2232 functions to clamp and fix the column 70, to avoid the disengagement of the first arc barrier 7 from the movable contact piece 22.

[0196] In one embodiment, as shown in FIG. 25 to FIG. 31, the mounting groove 223 further includes a second mounting portion 2233. The second mounting portion 2233 is disposed at the side of the movable contact piece 22 away from the stationary contact leading-out terminal 21. The second mounting portion 2233 is in communication with the first mounting portion 2231 through the fixing portion 2232. The column 70 is disposed through the second mounting portion 2233. A first guiding gap 73 is disposed between the outer wall of the column 70 and the inner wall of the second mounting portion 2233. The first guiding gap 73 is configured to guide the column 70.

[0197] The second mounting portion 2233 is disposed at a side of the movable contact piece 22 away from the stationary contact leading-out terminal 21, that is, the second mounting portion 2233 is located at the lower part of the side wall of the movable contact piece 22. The first guiding gap 73 is disposed between the first mounting portion 2231 and the column 70. The first guiding gap 73 is configured to guide the column 70. Since the column 70 needs to pass through the mounting groove 223 of the movable contact piece 22 from the bottom of the movable contact piece 22 when the first arc barrier 7 is mounted on the movable contact piece 22, the first guiding gap 73 is disposed between the outer wall of the column 70 and the inner wall of the second mounting portion 2233, that is, the outer wall of the column 70 and the inner wall of the second mounting portion 2233 are not attached to each other. The first guiding gap 73 is used to provide a guiding effect for the column 70, facilitating the mounting of the column 70 of the first arc barrier 7.

[0198] It can be understood that the first guiding gap 73 may be a horn-shaped structure with a large opening end disposed facing away from the stationary contact leading-out terminal 21. The large opening end of the first gap 72 serves as an inlet for the passage of the column 70, which further improves the mounting convenience of the first arc barrier 7.

[0199] In one embodiment, as shown in FIG. 25 to FIG. 31, the number of the columns 70 is two. The two mounting grooves 223 are disposed on both sides of the movable contact piece 22 along the width direction of the movable contact piece 22 and between the inner edges of the first contact part 220. The two columns 70 are disposed corresponding to the two mounting grooves 223.

[0200] Specifically, the two columns 70 are disposed correspondingly along the width direction of the movable contact piece 22. The two columns 70 may completely cut off the transfer path of the arc toward the direction where the pair of stationary contact leading-out terminals 21 face each other, which can achieve good arc isolation effect.

[0201] In one embodiment, as shown in FIG. 25 to FIG. 31, the first arc barrier 7 further includes a limiting part 74. The limiting part 74 is disposed at the side of the column 70 away from the movable contact piece 22 and may abut against the movable contact piece 22 to limit the column 70.

[0202] When the first arc barrier 7 is mounted to the movable contact piece 22, the limiting part 74 may abut against the movable contact piece 22 to perform initial positioning and limiting on the column 70 of the first arc barrier 7, and improve the mounting accuracy of the first arc barrier 7.

[0203] In one embodiment, as shown in FIG. 25 to FIG. 31, the first arc barrier 7 further includes an arc barrier ring 75. The arc barrier ring 75 wraps the end of the movable contact piece 22 along the length direction of the movable contact piece 22 and at least part of the side wall of the movable contact piece 22.

[0204] The arc barrier ring 75 of the first arc barrier 7 wraps the end of the movable contact piece 22 and at least part of the side wall of the movable contact piece 22, which is equivalent to mounting an arc barrier sleeve on the outer peripheral side of the contact area between the stationary contact leading-out terminal 21 and the movable contact piece 22, which can reduce the ablation of the outer wall of the movable contact piece 22 by the arc and impede the arc from transferring downward along the side wall of the movable contact piece 22, and is conducive to arc extinguishing. In addition, the arc barrier ring 75 is a hollow structure, that is, a central hole is disposed at a center of the arc barrier ring 75, and the arc barrier ring 75 functions to reduce weight, to meet the requirement of lightweight.

[0205] In one embodiment, as shown in FIG. 25 to FIG. 31, the first arc barrier 7 further includes a connecting part 76. The connecting part 76 is disposed at the bottom of one end of the movable contact piece 22 away from the stationary contact leading-out terminal 21 and connected to both ends of the arc barrier ring 75 respectively. The column 70 is disposed on the connecting part 76.

[0206] If the arc barrier ring 75 has an open end, the arc barrier ring 75 is of an open structure. The connecting part 76 is connected to both ends of the arc barrier ring 75 respectively, so that the first arc barrier 7 is an integrated structure to improve the fixing effect between the first arc barrier 7 and the movable contact piece 22. Meanwhile, the connecting part 76 is located at the bottom of the movable contact piece 22 and may not interfere with the mutual contact between the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0207] It should be specially noted that the relay contact assembly 2 provided in this embodiment may be provided with the first arc barrier 7, the first step 71 and the first gap 72 simultaneously. The first step 71 and the first gap 72 form a partial arc barrier structure for restricting part of the arc or the arc from transferring along the movable contact piece 22 toward the direction away from the stationary contact leading-out terminal 21 and restricting part of the arc from transferring along the movable contact piece 22 toward the direction in which the pair of stationary contact leading-out terminals 21 face each other. The first arc barrier 7 made of the insulating material has the performance of arc breaking or arc cooling to achieve the effect of arc extinguishing.

[0208] It should be specially noted that in some other embodiments, a second arc barrier may also be disposed outside the stationary contact leading-out terminal 21 to impede the arc transfer and protect the stationary contact leading-out terminal 21.

[0209] In one embodiment, as shown in FIG. 32, the contact unit provided in this embodiment further includes a contact container 1. The contact container 1 includes an insulating cover 11. The movable contact piece 22 is movably disposed within the insulating cover 11. The stationary contact leading-out terminal 21 is inserted into the insulating cover 11 and at least partially disposed in the insulating cover 11.

[0210] The insulating cover 11 and the yoke plate are connected by a frame piece 12, and the insulating cover 11 and the yoke plate enclose a contact chamber. The contact chamber provides an arc isolation environment for the contact between the movable contact piece 22 and the stationary contact leading-out terminal 21, to ensure the reliability of the relay during use.

[0211] In one embodiment, as shown in FIG. 33, the portion of the movable contact piece 22 is in contact with the pair of stationary contact leading-out terminals 21 is the first contact part 220. The first step 71 and / or the first gap 72 is disposed between the inner edges of the first contact part 220.

[0212] Specifically, the first contact part 220 is specifically two sets of movable contacts. Since an arc is generated at a portion where the movable contact piece 22 and the pair of stationary contact leading-out terminals 21 are in contact with each other, the first step 71 and / or the first gap 72 is disposed between the inner edges of the first contact part 220, and the first step 71 and / or the first gap 72 can cut off a lateral transfer path of the arc, to avoid the short circuit of the arc generated by the two sets of fixed and movable contacts.

[0213] In one embodiment, as shown in FIGS. 33 and 34, there is provided a movable contact piece 22 in this embodiment, one surface of the movable contact piece 22 facing the stationary contact leading-out terminal 21 is a top surface of the movable contact piece 22. An arc barrier portion is provided on the top surface of the movable contact piece 22 and is configured to impede the movement of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other.

[0214] The arc barrier portion is disposed on the top surface of the movable contact piece 22 to impede the transfer of the arc along the top surface of the movable contact piece 22, thereby isolating and cutting off the transfer path of the arc on the top surface of the movable contact piece 22, and impeding the transfer of the arc toward a center line of the movable contact piece 22 in a length direction, avoiding the arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, enabling the arc to be extinguished efficiently along the originally set arc extinguishing path of the magnetic blow-out field, and improving the arc extinguishing capability.

[0215] In one embodiment, as shown in FIGS. 12 and 13, the arc barrier portion is disposed between the inner edges of the two first contact parts 220.

[0216] A portion where the movable contact piece 22 is in contact with the pair of stationary contact leading-out terminals 21 is the first contact part 220, and the arc barrier portion is disposed between the inner edges of the first contact part 220, to cut off the path of arc transferring toward an inner side of the stationary contact leading-out terminals 21, avoid the arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, and ensure the high efficiency and thoroughness of arc extinguishing.

[0217] It should be particularly noted that the inner side specifically refers to a side where the pair of stationary contact leading-out terminals 21 face each other (as shown in FIG. 23, Q refers to a direction in which the pair of stationary contact leading-out terminals 21 face each other, and M refers to the center line of the stationary contact leading-out terminals 21), or a side close to the center line W of the movable contact piece 22 in the length direction (as shown in FIG. 33, L refers to a length direction of the movable contact piece 22, and T refers to a width direction of the movable contact piece 22). Therefore, the arc barrier portion is disposed on the side of the first contact part 220 facing the inner side.

[0218] In one embodiment, the number of the arc barrier portions is two, the two arc barrier portions are arranged corresponding to the pair of stationary contact leading-out terminals 21, and a distance between the outer edges of the two arc barrier portions along the length direction of the movable contact piece 22 is less than or equal to a distance between the inner edges of the first contact part 220.

[0219] Specifically, since the number of the stationary contact leading-out terminals 21 is two, the two arc barrier portions are arranged corresponding to the two stationary contact leading-out terminals 21 and disposed on the inner side of the stationary contact leading-out terminals 21, so that the arc generated by the separation of the two sets of movable and stationary contacts are subjected to arc isolation through the two arc barrier portions respectively, playing a dual arc isolation role and further improving the arc isolation effect.

[0220] In one embodiment, as shown in FIG. 33, the arc barrier portion is a first arc barrier groove 222; as shown in FIG. 34, the arc barrier portion is an arc barrier rib 225. In some other embodiments, both the first arc barrier groove 222 and the arc barrier rib 225 may be provided on the movable contact piece 22.

[0221] When the first arc barrier portion is the first arc barrier groove 222, a recessed structure is provided on the top surface of the movable contact piece 22; when the first arc barrier portion is the arc barrier rib 225, a protruding structure is provided on the top surface of the movable contact piece 22. These two structures can solve a problem of rapid arc transfer that may occur on the movable contact piece 22 having a top surface that is a plane. The first arc barrier groove 222 and / or the arc barrier rib 225 can isolate and cut off the path of the arc transferring on the top surface of the movable contact piece 22, and impede the transfer of the arc toward the center line of the movable contact piece 22 in the length direction, avoiding arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21.

[0222] Specifically, the first arc barrier groove 222 includes a first groove wall and a first groove bottom that are connected to each other. The arc moves to the connection between the first groove wall and the top surface of the movable contact piece 22 to form an arc concentration. A height difference between the top surface of one side of the movable contact piece 22 facing the stationary contact leading-out terminal 21 and the first groove bottom is used to impede the movement of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other.

[0223] Since the first arc barrier groove 222 has a first groove wall and a first groove bottom connected with each other, the connection between the first groove wall and the top surface of the movable contact piece 22 is an edge. The arc moves to the edge to form the arc concentration. Meanwhile, the height difference between the top surface of the movable contact piece 22 and the first groove bottom creates a drop on the arc transfer path, which can prevent the arc from easily moving toward the center line of the movable contact piece 22 in the length direction, and the combination of the edge and the drop can improve the arc extinguishing effect.

[0224] In one embodiment, as shown in FIG. 28, the first arc barrier groove 222 is a through groove extending along a width direction of the movable contact piece 22.

[0225] If the first arc barrier groove 222 extends along the length direction of the movable contact piece 22, the arc may transfer along the portion of the top surface of the movable contact piece 22 where the first arc barrier groove 222 is not provided, resulting in a risk of arc short-circuit. Therefore, the first arc barrier groove 222 is configured as a through groove along the width direction of the movable contact piece 22. Since the through groove is arranged to penetrate the width direction of the movable contact piece 22, after the arc enters the first arc barrier groove 222, the transfer path of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other is completely cut off.

[0226] In one embodiment, the first arc barrier groove 222 has an arc-shaped structure, and the first arc barrier groove 222 is arranged around the stationary contact leading-out terminal 21.

[0227] Specifically, since the bottom of the stationary contact leading-out terminal 21 is similar to a cylindrical structure, the shape of the first arc barrier groove 222 is adapted to an outer contour of the bottom of the stationary contact leading-out terminal 21. The first arc barrier groove 222 with the arc-shaped structure is arranged along the outer contour of the stationary contact leading-out terminal 21 and around the stationary contact leading-out terminal 21, to impede the arc transfer path in all directions.

[0228] It can be understood that the first arc barrier groove 222 with the arc-shaped structure extends from one side to the other side of the movable contact piece 22 along the width direction, so that contact parts are formed on the portions at both ends of the movable contact piece 22 along the length direction where the first arc barrier groove 222 is not provided, and the contact parts are used for contacting the stationary contact leading-out terminal 21.

[0229] It should be particularly noted that, the first arc barrier groove 222 may be replaced by the arc barrier rib 225, and the arrangement position and shape of the arc barrier rib 225 are similar to those of the first arc barrier groove 222, which will not be repeated.

[0230] This embodiment also provides a relay, including the contact unit described above.

[0231] In the relay provided in this embodiment, the movable contact piece 22 and the pair of stationary contact leading-out terminals 21 of the contact unit are contacted with or separated from one another. When the movable contact piece 22 comes into contact with the stationary contacts at the bottom of the pair of stationary contact leading-out terminals 21, current flows in from one stationary contact leading-out terminal 21, passes through the movable contact piece 22 and then flows out of the other stationary contact leading-out terminal 21, thereby connecting the load.

[0232] In one embodiment, as shown in FIGS. 35-37, the relay further includes a push assembly 4, which includes a push rod unit 41, an elastic member 43 and a U-shaped bracket 42. The push rod unit 41 includes a base 413 and a push rod 411, and the base 413 and an upper part of the push rod 411 may be integrally injection-molded. The U-shaped bracket 42 and the base 413 enclose a frame structure, the movable contact piece 22 and the elastic member 43 are mounted within the frame structure enclosed by the U-shaped bracket 42 and the base 413. One end of the elastic member 43 abuts against the base 413, and the other end of the elastic member 43 abuts against the movable contact piece 22. The elastic member 43 may provide an elastic force, so that the movable contact piece 22 has a tendency to move away from the base 413 and approach the stationary contact leading-out terminal 21.

[0233] Specifically, the push rod unit 41 and the U-shaped bracket 42 are matched through the limiting protrusion 412 and the limiting hole 421. A moving force of the push rod unit 41 may be transmitted to the U-shaped bracket 42 for driving the movement of the movable contact piece 22, so that the movable contact piece 22 can be contacted with or separated from the pair of stationary contact leading-out terminals 21.

[0234] The push assembly 4 of the relay further includes an electromagnet unit 44 (as shown in FIGS. 23-24), which is disposed on a side of a yoke plate facing away from the insulating cover 11. The push rod unit 41 is drivenly connected to the electromagnet unit 44, and the push rod unit 41 is movably disposed in a driving chamber enclosed by a metal cover and the yoke plate, and abuts against the movable contact piece 22 through a via hole of the yoke plate. When the electromagnet unit 44 is energized, the push rod unit 41 may be driven to move, to further drive the movable contact piece 22 to move, so as to contact with or separate from the stationary contact leading-out terminal 21.

[0235] The electromagnet unit 44 includes a coil bobbin 441, a coil 442, a stationary core 444, a movable core 443, a U-shaped yoke 445, a magnetic sleeve 446 and a spring 447. The coil bobbin 441 is disposed within the U-shaped yoke 445, the coil bobbin 441 is in a hollow cylindrical shape and made of an insulating material. The magnetic sleeve 446 penetrates through and is disposed within the coil bobbin 441, and the coil 442 is wound around the coil bobbin 441. The stationary core 444 is provided with a second perforation that is arranged corresponding to the via hole of the yoke plate, through which the push rod unit 41 may pass. The movable core 443 is movably disposed within the magnetic sleeve 446 and arranged opposite to the stationary core 444. The spring 447 is disposed between the stationary core 444 and the movable core 443 and is capable of abutting against each of them. The movable core 443 is connected to the push rod unit 41 and configured to be attracted by the stationary core 444 when the coil 442 is energized. The movable core 443 and the push rod unit 41 may be connected by screwing, riveting, welding or other means.

[0236] The working process of the relay provided in this embodiment is as follows:

[0237] When the coil 442 is energized, the stationary core 444 attracts the movable core 443, the movable core 443 drives the push rod unit 41 to move upward, the spring 447 between the stationary core 444 and the movable core 443 is compressed, and the push rod unit 41 pushes the movable contact piece 22 to move by means of the U-shaped bracket 42 and the elastic member 43, so that the two ends of the movable contact piece 22 are respectively in contact with the two stationary contact leading-out terminals 21, to close the movable and stationary contacts.

[0238] When the current of the coil 442 is interrupted, the stationary core 444 releases the attraction to the movable core 443. Under the elastic force of the compressed spring 447, the movable core 443 drives the push rod unit 41 to move downward, so that the movable contacts at the two ends of the movable contact piece 22 are separated from the two stationary contact leading-out terminals 21, to separate the movable and stationary contacts.

[0239] When the short-circuit load is large, under the action of the short-circuit current, an electro-dynamic repulsive force may be generated between the movable contact piece 22 and the stationary contact leading-out terminal 21, causing the contacts to bounce open, resulting in arc generation between the contacts and severe combustion thereof, and even causing an explosion.

[0240] For this purpose, the relay provided in this embodiment further includes a short-circuit resistant assembly 3 (as shown in FIGS. 23-24), which is disposed at least on the upper side of the movable contact piece 22 along an axial direction of the stationary contact leading-out terminal 21, and generates an attractive force when a fault high current occurs in the movable contact piece 22, to resist the electro-dynamic repulsive force between the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0241] The short-circuit resistant assembly 3 may also be a short-circuit ring disposed between the pair of stationary contact leading-out terminals 21. For a high-voltage DC relay, the first arc barrier 7 may prevent the arc from being attracted by the short-circuit resistant assembly 3 to move toward the direction in which the pair of stationary contact leading-out terminals 21 face each other, thus avoiding the reduction of insulation between the contacts or arc short-circuit.

[0242] Specifically, a thrust part 221 of the movable contact piece 22 is disposed between two contact parts. The short-circuit resistant assembly 3 is disposed on the thrust part 221 of the movable contact piece 22. Both sides of the thrust part 221 are plane structures. The plane on the both sides of the thrust part 221 provides mounting convenience and reliability for the short-circuit resistant assembly 3. The short-circuit resistant assembly 3 is configured to resist the electro-dynamic repulsive force between the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0243] In one embodiment, the short-circuit resistant assembly 3 includes an upper magnetic conductor 31 and a lower magnetic conductor 32. The upper magnetic conductor 31 is disposed at the side of the movable contact piece 22 facing the stationary contact leading-out terminal 21. The lower magnetic conductor 32 is at least partially disposed at the side of the movable contact piece 22 facing away from the stationary contact leading-out terminal 21 to form a magnetic conductive circuit between the upper magnetic conductor 31 and the lower magnetic conductor 32. The upper magnetic conductor 31 and the lower magnetic conductor 32 may be made of materials such as iron, cobalt, nickel and their alloys.

[0244] The upper magnetic conductor 31 is disposed at the side of the thrust part 221 facing the stationary contact leading-out terminal 21, and the lower magnetic conductor 32 is disposed at the side of the thrust part 221 facing away from the stationary contact leading-out terminal 21, that is, the lower magnetic conductor 32 is fixed below the thrust part 221 of the movable contact piece 22. The magnetic conductive circuit may be formed between the upper magnetic conductor 31 and the lower magnetic conductor 32, and the lower magnetic conductor 32 may move together with the movable contact piece 22 in the direction close to the stationary contact leading-out terminal 21. When a high fault current occurs in the movable contact piece 22, since the upper magnetic conductor 31 is located above the movable contact piece 22 and the lower magnetic conductor 32 is located below the movable contact piece 22, the movable contact piece 22 is clamped between the upper magnetic conductor 31 and the lower magnetic conductor 32. When the upper magnetic conductor 31 generates an attractive force on the lower magnetic conductor 32, the attractive force functions to attract and pull the movable contact piece 22 and resist the electro-dynamic repulsive force generated by the fault current between the movable contact piece 22 and the stationary contact leading-out terminal 21, to avoid the occurrence of arc pulling and explosion caused by the mutual separation between the movable contact piece 22 and the stationary contact leading-out terminal 21, and ensure the reliability and safety of the contact between the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0245] In one embodiment, the upper magnetic conductor 31 may be a linear structure, the upper magnetic conductor 31 is disposed at a position corresponding to a portion between the two contact parts of the movable contact piece 22. The upper magnetic conductor 31 may extend along the width direction of the movable contact piece 22 for the matching and correspondence of the upper magnetic conductor 31 and the lower magnetic conductor 32. The lower magnetic conductor 32 is a U-shaped structure, and the opening of the lower magnetic conductor 32 is disposed facing the movable contact piece 22, so that the two side arms of the lower magnetic conductor 32 extend toward the upper magnetic conductor 31, thus the two side arms of the lower magnetic conductor 32 may be close to or in contact with the two ends of the upper magnetic conductor 31 respectively to form a surrounding magnetic ring along the width of the movable contact piece 22. Since the contact parts at the two ends of the movable contact piece 22 along its length direction are movable contacts, the surrounding magnetic ring formed along the width direction of the movable contact piece 22 may not cause interference, and when a high fault current occurs in the movable contact piece 22, an electro-dynamic attractive force in the direction of the movable contact pressure is generated to resist the electro-dynamic repulsive force generated by the fault current between the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0246] It should be specially noted that the U-shaped bracket 42 may be fixedly connected to the upper magnetic conductor 31, the lower magnetic conductor 32 is connected to the bottom of the movable contact piece 22. The movable contact piece 22 and the lower magnetic conductor 32 form a movable member. The short-circuit resistant assembly 3 and the movable contact piece 22 are disposed between the U-shaped bracket 42 and the push rod unit 41.

[0247] In one embodiment, as shown in FIG. 32, the relay further includes an arc extinguishing unit 5, which is disposed within a hollow chamber of the housing and configured to extinguish the arc of the contact assembly 2. The arc extinguishing unit 5 includes two arc extinguishing magnets 51. The arc extinguishing magnets 51 may be permanent magnets, and each arc extinguishing magnet 51 may substantially be a cuboid. The two arc extinguishing magnets 51 are respectively disposed on both sides of the insulating cover 11 and oppositely arranged along the length direction of the movable contact piece 22.

[0248] In this embodiment, the two arc extinguishing magnets 51 are respectively located on the left and right sides of the insulating cover 11. The surfaces facing to one another of the two arc extinguishing magnets 51 have opposite polarities. That is to say, a left surface of the arc extinguishing magnet 51 on the left side of the insulating cover 11 is an S pole and a right surface thereof is an N pole, and the left surface of the arc extinguishing magnet 51 on the right side of the insulating cover 11 is an S pole and the right surface thereof is an N pole.

[0249] Certainly, the surfaces facing to one another of the two arc extinguishing magnets 51 may also be designed to have the same polarity. For example, the left surface of the arc extinguishing magnet 51 on the left side of the insulating cover 11 is an S pole and the right surface thereof is an N pole, and the left surface of the arc extinguishing magnet 51 on the right side of the insulating cover 11 is an N pole and the right surface thereof is an S pole.

[0250] In this way, by arranging two oppositely disposed arc extinguishing magnets 51, a magnetic field may be formed around the contact assembly 2.

[0251] Therefore, the arc generated between the stationary contact leading-out terminal 21 and the movable contact piece 22 may be elongated in the direction away from each other under the action of the magnetic field, thereby realizing arc extinguishing.

[0252] The arc extinguishing unit 5 further includes two yoke clamps 52, which are arranged in positions corresponding to the two arc extinguishing magnets 51. Moreover, the two yoke clamps 52 surround the insulating cover 11 and the two arc extinguishing magnets 51. The design of the yoke clamps 52 surrounding the arc extinguishing magnets 51 can prevent the magnetic field generated by the arc extinguishing magnets 51 from diffusing outward and affecting the arc extinguishing effect. The yoke clamps 52 are made of soft magnetic materials. The soft magnetic materials may include but are not limited to iron, cobalt, nickel and the alloys thereof, etc.Fifth Embodiment

[0253] This embodiment is similar to the fourth embodiment, with the only difference in the structure of the first arc barrier groove 222.

[0254] As shown in FIGS. 38-40, the first arc barrier groove 222 provided in this embodiment has at least one of a linear structure, a convex structure and an X-shaped structure.

[0255] Specifically, as shown in FIG. 38, the first arc barrier groove 222 is of a linear structure with a simple structure and convenient production and processing. Moreover, since a width of the first arc barrier groove 222 along the length direction of the movable contact piece 22 is relatively narrow, the overall structural strength of the movable contact piece 22 is relatively high.

[0256] As shown in FIG. 39, the first arc barrier groove 222 has a convex structure, so that the first arc barrier groove 222 has a broken-line groove structure, which increases the tortuosity of the transfer path of the arc, thereby improving the arc extinguishing effect.

[0257] As shown in FIG. 40, the first arc barrier groove 222 has an X-shaped structure. The X-shaped structure includes two intersecting slots, so that the arc on each side can be blocked by the transfer path through the two slots, playing a dual arc isolation role with good isolation and arc extinguishing effects.

[0258] It can be understood that the two first arc barrier grooves 222 in this embodiment may have the same or different shapes. For example, one of the first arc barrier grooves 222 has a convex structure, and the other of the first arc barrier grooves 222 has a linear structure.

[0259] It can be understood that the first arc barrier groove 222 provided in this embodiment includes but is not limited to the linear structure and the X-shaped structure, and may also have an S-shaped structure, a tapered structure, etc. Its specific shape can be adjusted according to actual production conditions.

[0260] It should be particularly noted that, as shown in FIGS. 41-43, the first arc barrier groove 222 may be replaced by an arc barrier rib 225, and the arrangement position and shape of the arc barrier rib 225 are similar to those of the first arc barrier groove 222, which will not be repeated.Sixth Embodiment

[0261] This embodiment is similar to the fourth embodiment, with the only difference in the quantity and structure of the arc barrier portions.

[0262] As shown in FIGS. 44-45, the number of the arc barrier portions provided in this embodiment is one. The portions of the movable contact piece 22, which are not provided with the arc barrier portions, and the portions on both sides of the movable contact piece 22 along the length direction are in contact with the pair of stationary contact leading-out terminals 21, respectively.

[0263] When the arc barrier portion is the first arc barrier groove 222, since one first arc barrier groove 222 is disposed between the pair of stationary contact leading-out terminals 21, and the width of the first arc barrier groove 222 along the length direction of the movable contact piece 22 is relatively wide, the portions of the movable contact piece 22, which are not provided with the first arc barrier groove 222 and disposed on both ends along the length direction of the movable contact piece 22 are respectively two contact parts. The two contact parts are correspondingly in contact with the pair of stationary contact leading-out terminals 21. The arc isolation process for the two sets of movable and stationary contacts can be realized by using one first arc barrier groove 222, which has a simple structure and relatively low production cost.

[0264] In one embodiment, a distance between the two side edges of the first arc barrier groove 222 along the length direction of the movable contact piece 22 is less than or equal to a distance between the bottoms of the pair of stationary contact leading-out terminals 21.

[0265] Specifically, the width of the first arc barrier groove 222 along the length direction of the movable contact piece 22 extends to a vicinity of the inner side edges of the bottoms of the stationary contact leading-out terminals 21 or is flush with the inner side edges of the bottoms of the stationary contact leading-out terminals 21, so that the edge between the first groove wall of the first arc barrier groove 222 and the top surface of the movable contact piece 22 is as close as possible to the bottoms of the stationary contact leading-out terminals 21. The arc can be concentrated at the edge as soon as possible, and the drop between the top surface of the movable contact piece 22 and the first groove bottom of the first arc barrier groove 222 is utilized to reduce the risk of the arc transferring toward the center line of the movable contact piece 22.

[0266] It should be particularly noted that, as shown in FIG. 45, the first arc barrier groove 222 may be replaced by the arc barrier rib 225, and the arrangement position and shape of the arc barrier rib 225 are similar to those of the first arc barrier groove 222, which will not be repeated.Sixth Embodiment

[0267] This embodiment is similar to the fourth embodiment and the fifth embodiment, with the difference in that other detailed structures of the movable contact piece 22 are added on the basis of the fourth embodiment or the fifth embodiment.

[0268] In the movable contact piece 22 provided in this embodiment, a second arc barrier groove (not shown) may also be provided on the side walls of the movable contact piece 22, and the second arc barrier grooves are configured to impede the movement of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other.

[0269] This embodiment provides a movable contact piece 22. The second arc barrier grooves are disposed on the side walls of the movable contact piece 22 to impede the arc transfer along the side walls of the movable contact piece 22 toward the center line of the movable contact piece 22 in the length direction, thereby isolating and cutting off the transfer path of the arc on the side walls of the movable contact piece 22, avoiding the arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, enabling the arc to be extinguished efficiently along the originally set arc extinguishing path of the magnetic blow-out field, and improving the arc extinguishing capability.

[0270] In one embodiment, the second arc barrier grooves are disposed between the inner edges of the two first contact parts 220.

[0271] In other words, the second arc barrier grooves are disposed on the inner side of the stationary contact leading-out terminals 21, to cut off the transfer path of the arc toward the inner side of the stationary contact leading-out terminals 21, avoid the arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, and ensure the high efficiency and thoroughness of arc extinguishing.

[0272] In one embodiment, the number of the second arc barrier grooves is multiple, and the multiple second arc barrier grooves are disposed on both sides of the movable contact piece 22 along the length direction of the movable contact piece 22; and / or, the number of the second arc barrier grooves is multiple, and the multiple second arc barrier grooves are disposed on both sides of the movable contact piece 22 along the width direction of the movable contact piece 22.

[0273] For example, the number of the second arc barrier grooves is four, with two second arc barrier grooves provided on each side of the movable contact piece 22 along its length direction, and two second arc barrier grooves provided on each side of the movable contact piece 22 along its width direction. The four second arc barrier grooves are disposed at four corners of the thrust part 221 of the movable contact piece 22, so that the arc may be isolated by the second arc barrier grooves no matter in which directions the arc transfers along the side walls of the movable contact piece 22, which can improve the arc isolation effect.

[0274] In one embodiment, the second arc barrier groove includes a second groove wall and a second groove bottom that are connected to each other. The arc moves to the connection between the second groove wall and the side wall of the movable contact piece 22 to form an arc concentration. A height difference between the side wall of the movable contact piece 22 and the second groove bottom is used to impede the movement of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other.

[0275] Since the second arc barrier groove has the second groove wall and the second groove bottom connected with each other, the connection between the second groove wall and the side wall of the movable contact piece 22 is an edge. The arc moves to the edge to form an arc concentration. The height difference between the side wall of the movable contact piece 22 and the second groove bottom creates a drop on the arc transfer path along the side wall of the movable contact piece 22, which can prevent the arc from easily moving toward the center line of the movable contact piece 22 in the length direction, and the combination of the edge and the drop can improve the arc extinguishing effect.

[0276] In one embodiment, the second arc barrier groove is a through groove extending along the axial direction of the stationary contact leading-out terminal 21.

[0277] If the second arc barrier groove extends along the length direction of the movable contact piece 22, the arc can transfer along the part of the side wall of the movable contact piece 22 where the second arc barrier groove is not provided, resulting in a risk of arc short-circuit. Therefore, the second arc barrier groove is configured as a through groove extending along an axial direction of the stationary contact leading-out terminal 21. Since the through groove is arranged to penetrate a height direction of the movable contact piece 22, after the arc enters the second arc barrier groove, the transfer path of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other is completely cut off.

[0278] Furthermore, the present disclosure also provides a relay contact assembly and a relay with reliable arc interruption and good safety performance.

[0279] According to a first aspect of the present disclosure, there is provided a relay contact assembly, including: a pair of stationary contact leading-out terminals; a movable contact piece configured to be contacted with or separated from the pair of stationary contact leading-out terminals; a first arc barrier disposed outside the stationary contact leading-out terminals and configured to impede arc transfer; and a second arc barrier mounted on the movable contact piece and configured to impede the arc transfer.

[0280] In some implementations, the first arc barrier is sleeved outside the stationary contact leading-out terminals; and / or, the second arc barrier is sleeved on an outer wall of the movable contact piece.

[0281] In some implementations, a first step and / or a first gap is disposed between the first arc barrier and the stationary contact leading-out terminal and configured to impede the arc transfer.

[0282] In some implementations, the first arc barrier protrudes from an outer peripheral wall of the stationary contact leading-out terminal, and the first step is formed between a bottom wall at one end of the first arc barrier facing the movable contact piece and an outer peripheral wall of the corresponding stationary contact leading-out terminal.

[0283] In some implementations, the first gap is disposed between an inner wall of a bottom at one end of the first arc barrier facing the movable contact piece and an outer peripheral wall of the stationary contact leading-out terminal.

[0284] In some implementations, one of an inner wall of the first arc barrier and an outer wall of the stationary contact leading-out terminal is provided with a limiting part, the other of the inner wall of the first arc barrier and the outer wall of the stationary contact leading-out terminal is provided with a fitting part, and the limiting part is engaged with the fitting part.

[0285] In some implementations, a stationary contact is disposed at a bottom of the stationary contact leading-out terminal, and an outer peripheral wall of the first arc barrier protrudes from an outer peripheral wall of the stationary contact; the stationary contact leading-out terminal and the stationary contact are of an integrally formed structure or a separately formed structure.

[0286] In some implementations, one end of the first gap facing the movable contact piece is provided with an open end, and one end of the first gap away from the movable contact piece is provided with a closed end.

[0287] In some implementations, the first gap is disposed between an inner peripheral wall of a bottom of the first arc barrier and an outer peripheral wall of a bottom of the stationary contact leading-out terminal.

[0288] In some implementations, a portion of the movable contact piece in contact with the pair of stationary contact leading-out terminals is a first contact part, and the first step and / or the first gap is at least partially disposed between inner edges of the first contact part.

[0289] In some implementations, a second step is disposed between the second arc barrier and the movable contact piece and configured to impede the arc transfer; and / or, a second gap is disposed between the second arc barrier and the movable contact piece and configured to impede the arc transfer.

[0290] In some implementations, a portion of the movable contact piece in contact with the pair of stationary contact leading-out terminals is a first contact part, and the second step and / or the second gap is disposed between inner edges of the first contact part.

[0291] In some implementations, the second arc barrier includes a column, a top surface at one end of the column facing the stationary contact leading-out terminal protrudes from a top surface at one end of the movable contact piece facing the stationary contact leading-out terminal, so that the second step is formed between the top surface of the column and the top surface of the movable contact piece.

[0292] In some implementations, a mounting groove is disposed on a side wall of the movable contact piece, the column is at least partially disposed within the mounting groove, and the second gap is disposed between the column and the mounting groove.

[0293] In some implementations, the second gap is disposed along an axial direction of the column.

[0294] In some implementations, one end of the second gap facing the stationary contact leading-out terminal is provided with an open end, and one end of the second gap facing away from the stationary contact leading-out terminal is provided with a closed end.

[0295] In some implementations, the mounting groove includes a first mounting portion, the first mounting portion is disposed at one side of the movable contact piece facing the stationary contact leading-out terminal, the column is inserted into the first mounting portion, and the second gap is disposed between the column and the first mounting portion.

[0296] In some implementations, the second gap is of a horn-shaped structure, and a large opening end of the second gap is disposed facing the stationary contact leading-out terminal.

[0297] In some implementations, the mounting groove further includes a fixing portion, the fixing portion is in communication with the first mounting portion, and the column is engaged with the fixing portion to fix the second arc barrier.

[0298] In some implementations, the mounting groove further includes a second mounting portion, the second mounting portion is disposed at one side of the movable contact piece away from the stationary contact leading-out terminal, the second mounting portion is in communication with the first mounting portion through the fixing portion, the column is inserted into the second mounting portion, and a second guiding gap is disposed between an outer wall of the column and an inner wall of the second mounting portion and is configured to guide the column.

[0299] In some implementations, a number of each of the columns and the mounting grooves is two, the two mounting grooves are disposed at two sides of the movable contact piece along a width direction of the movable contact piece and disposed between inner edges of the two first contact parts, and the two columns are disposed corresponding to the two mounting grooves.

[0300] In some implementations, the second arc barrier further includes a limiting part, the limiting part is disposed at one side of the column away from the movable contact piece and is capable of abutting against the movable contact piece to limit the column.

[0301] In some implementations, the second arc barrier further includes an arc barrier ring, and the arc barrier ring wraps an end of the movable contact piece along a length direction of the movable contact piece and at least a part of side walls of the movable contact piece, to impede the arc transfer.

[0302] In some implementations, the second arc barrier further includes a connecting part, the connecting part is disposed at a bottom of one end of the movable contact piece away from the stationary contact leading-out terminal and connected to two ends of the arc barrier ring respectively, and the column is disposed to the connecting part.

[0303] In some implementations, a number of the second arc barriers is two, and the two second arc barriers are disposed at two ends of the movable contact piece along a length direction of the movable contact piece respectively.

[0304] In some implementations, both the first arc barrier and the second arc barrier are made of an insulating material.

[0305] In some implementations, one side of the movable contact piece facing the stationary contact leading-out terminal is provided with an arc barrier part, and the arc barrier part is configured to impede an arc from moving along a top surface at one side of the movable contact piece facing the stationary contact leading-out terminals and toward a direction where the pair of stationary contact leading-out terminals face each other.

[0306] In some implementations, the arc barrier part is a first arc barrier groove; and / or, the arc barrier part is an arc barrier rib.

[0307] In some implementations, a portion of the movable contact piece in contact with the pair of stationary contact leading-out terminals is a first contact part, and the arc barrier part is disposed between inner edges of the first contact part.

[0308] According to a second aspect of the present disclosure, a relay of the embodiments of the present disclosure includes the relay contact assembly as above described.

[0309] In some implementations, the relay further includes a short-circuit resistant assembly, the short-circuit resistant assembly is disposed at least on one side of the movable contact piece facing the stationary contact leading-out terminal, and is configured to resist an electro-dynamic repulsive force between the movable contact piece and the stationary contact leading-out terminal by generating a suction force when a high fault current occurs in the movable contact piece.

[0310] One embodiment of the present disclosure has following advantages or beneficial effects: In the relay contact assembly and the relay provided by the embodiments of the present disclosure, the movable contact piece is contacted with or separated from a pair of stationary contact leading-out terminals; when the movable contact piece is in contact with the stationary contacts at the bottoms of the pair of stationary contact leading-out terminals, current flows in from one stationary contact leading-out terminal and flows out from the other stationary contact leading-out terminal after passing through the movable contact piece, thereby achieving load connection. When the movable contact piece is separated from the stationary contacts at the bottoms of the pair of stationary contact leading-out terminals, the contacts break under load, and an arc is generated between the contacts. When the arc moves up and down along the outer wall of the stationary contact leading-out terminal under the action of a magnetic field, the first arc barrier is disposed on the outer wall of the stationary contact leading-out terminal, which can block the transfer of the arc and reduce the ablation on the peripheral side wall of the stationary contact leading-out terminal caused by the arc. Meanwhile, the second arc barrier is mounted on the movable contact piece, and the second arc barrier is close to the arc initiation point, which can impede the arc transfer better. It can further prevent the arc from being attracted by the short-circuit ring so that the arcs are attracted toward each other between the contacts, and prevent the insulation between the contacts from decreasing or the arc from short-circuiting.

[0311] Under the combined action of the first arc barrier and the second arc barrier, a transfer range of the arc is limited between the movable contact piece and the stationary contact leading-out terminals, arc isolation can be achieved more comprehensively, the transfer of the arc can be impeded, and the arc extinguishing performance can be improved.

[0312] Hereinafter, example embodiments will be described more fully with reference to the accompanying drawings.Seventh Embodiment

[0313] The present embodiment provides a relay contact assembly 2. As shown in FIGS. 46-48, the relay contact assembly 2 includes a movable contact piece 22 and a pair of stationary contact leading-out terminals 21. The movable contact piece 22 is configured to contact with or separate from the pair of stationary contact leading-out terminals 21.

[0314] In the relay contact assembly 2 provided by the present embodiment, the movable contact piece 22 is contacted with or separated from the pair of stationary contact leading-out terminals 21. When the movable contact piece 22 comes into contact with stationary contacts at the bottom of the pair of stationary contact leading-out terminals 21, current flows in from one stationary contact leading-out terminal 21, passes through the movable contact piece 22 and then flows out of the other stationary contact leading-out terminal 21, thereby realizing load connection.

[0315] In one embodiment, a stationary contact is disposed at the bottom of the stationary contact leading-out terminal 21. The stationary contact leading-out terminal 21 and the stationary contact are of an integrally formed structure or a separately formed structure.

[0316] Specifically, the bottom of the stationary contact leading-out terminal 21 may serve directly as the stationary contact, or the stationary contact may be disposed at the bottom of the stationary contact leading-out terminal 21 integrally or separately.

[0317] When the movable contact piece 22 is separated from the stationary contacts at the bottom of the pair of stationary contact leading-out terminals 21, along with the separation of the movable and stationary contacts between the movable contact piece 22 and the stationary contact leading-out terminals 21 and a magnetic blow arc-pulling, if the arc is pulled to a certain extent, the arc will be extinguished automatically; if the arc is not stable enough at the movable and stationary contacts and transfers on the surface of the movable contact piece 22 or the stationary contact, the arc cannot be extinguished mainly along the magnetic blow-out arc pulling path, eventually resulting in failure to break the arc and even explosion and burnout of the relay.

[0318] In order to solve this problem, as shown in FIGS. 46-48, the relay contact assembly 2 provided in this embodiment further includes a first arc barrier 6 and a second arc barrier 8, and the first arc barrier 6 is disposed outside the stationary contact leading-out terminal 21 and configured to impede arc transfer. The second arc barrier 8 is mounted on the movable contact piece 22 and configured to impede the arc transfer.

[0319] In the relay contact assembly 2 provided in this embodiment, when an arc moves up and down along the outer wall of the stationary contact leading-out terminal 21 under the action of a magnetic field, the first arc barrier 6 is disposed outside the stationary contact leading-out terminal 21, and under the action of the first arc barrier 6, the risk of ablation on the peripheral side wall of the stationary contact leading-out terminal 21 caused by the arc can be reduced. The second arc barrier 8 is mounted on the movable contact piece 22, and the second arc barrier 8 is closer to the arc initiation point, which can impede the transfer of the arc better.

[0320] In one embodiment, the first arc barrier 6 is made of an insulating material.

[0321] Specifically, the first arc barrier 6 may be made of insulating materials such as ceramics, glass, rubber or plastic, and the first arc barrier 6 made of an insulating material has good arc breaking or arc cooling performance, with strong arc extinguishing capacity and good arc extinguishing effect.

[0322] It can be understood that in some other embodiments, the first arc barrier 6 may also be made of a metal material.

[0323] In one embodiment, as shown in FIG. 49 to FIG. 50, the first arc barrier 6 is disposed within the insulating cover 11 and sleeved outside the stationary contact leading-out terminal 21.

[0324] The first arc barrier 6 may also be an arc barrier sleeve, and the first arc barrier 6 is sleeved on the stationary contact leading-out terminal 21 to perform arc isolation treatment on the outer peripheral side of the contact area corresponding to the stationary contact of the stationary contact leading-out terminal 21, which can achieve more comprehensive arc isolation and facilitate arc extinguishing.

[0325] It should be particularly noted that, the first arc barrier 6 is sleeved on the stationary contact leading-out terminal 21, and the first arc barrier 6 includes but not limited to a cylindrical shape, an elliptical cylindrical shape, a square cylindrical shape, a polygonal cylindrical shape and the like.

[0326] In one embodiment, the first arc barrier 6 is a closed ring structure annularly disposed on the stationary contact leading-out terminal 21; or, the first arc barrier 6 is annularly and spacedly distributed around the stationary contact leading-out terminal 21.

[0327] In addition, the first arc barrier 6 may be of an integrally formed structure, for example, the first arc barrier 6 is in an integral cylindrical shape or an annular shape, sleeved outside the stationary contact leading-out terminal 21. The use of the integrally formed structure reduces the links of part assembly and results in relatively low production cost.

[0328] Specifically, the first arc barrier 6 may also be of a separately formed structure, the first arc barrier 6 includes a plurality of insulating monomers. The plurality of insulating monomers are disposed along a circumferential direction of the stationary contact leading-out terminal 21 and may be connected end to end to a cylindrical shape, a polygonal cylindrical shape and other structures. In some other embodiments, the plurality of insulating monomers may also be distributed annularly and at intervals around the outer side of the stationary contact leading-out terminal 21, or a single insulating monomer may be disposed outside the stationary contact leading-out terminal 21. This embodiment is not limited thereto as long as the insulating and arc extinguishing effects can be achieved.

[0329] In one embodiment, as shown in FIG. 50 to FIG. 52, a first step 61 and / or a first gap 60 is disposed between the first arc barrier 6 and the stationary contact leading-out terminal 21, and is configured to impede the arc from transferring along the outer wall of the stationary contact leading-out terminal 21 and toward a direction away from the movable contact piece 22.

[0330] The first step 61 and / or the first gap 60 is provided at a position where the first arc barrier 6 is in contact with the stationary contact leading-out terminals 21 and disposed on a moving path of the arc, that is, a bend is formed on the arc path, which can consume the kinetic energy of the arc and better block the arc transfer. The arc has two transfer directions: first, the first step 61 and / or the first gap 60 can block the arc from transferring toward the direction in which the pair of stationary contact leading-out terminals 21 face each other, to avoid the occurrence of arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21; second, the first step 61 and / or the first gap 60 can block the arc from transferring upward toward a direction away from the movable contact piece 22 along the outer wall of the stationary contact leading-out terminals 21, further reduce the ablation of the outer wall of the stationary contact leading-out terminals 21 by the arc, improve the arc extinguishing capability and effect, and thus improve the interruption capability between the movable contact and the stationary contact corresponding to the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0331] In one embodiment, as shown in FIG. 52, the outer peripheral wall of the first arc barrier 6 protrudes from the outer peripheral wall of the stationary contact leading-out terminal 21, and a first step 61 is formed between the bottom wall of the first arc barrier 6 and the outer peripheral wall of the corresponding stationary contact leading-out terminal 21.

[0332] The outer peripheral wall of the first arc barrier 6 and the outer peripheral wall of the stationary contact leading-out terminal 21 are not disposed coplanarly, or the first arc barrier 6 is not embedded in the outer peripheral wall of the stationary contact leading-out terminal 21, such that the first step 61 is formed between the bottom wall of the first arc barrier 6 and the outer peripheral wall of the corresponding stationary contact leading-out terminal 21. The first step 61 is closer to the arc initiation point and restricts the arc from moving upward along the surface of the stationary contact leading-out terminal 21, thereby reducing the ablation on the outer peripheral wall of the stationary contact leading-out terminal 21 and the ablation in the direction away from the movable contact piece 22, so as to achieve the purpose of consuming the energy of the arc.

[0333] The outer peripheral wall of the first arc barrier 6 protrudes from the outer peripheral wall of the stationary contact.

[0334] The outer peripheral wall of the first arc barrier 6 and the outer peripheral wall of the stationary contact are not disposed coplanarly, and the stationary contact is located below the first arc barrier 6, such that the first step 61 is formed between the bottom wall of the first arc barrier 6 and the outer peripheral wall of the corresponding stationary contact. The first step 61 is closer to the arc initiation point, thereby reducing the ablation on the outer peripheral wall of the stationary contact leading-out terminal 21 by the arc and the ablation in the direction away from the movable contact piece 22, and realizing the protection of the stationary contact leading-out terminal 21.

[0335] In one embodiment, as shown in FIG. 52, the first gap 60 is disposed between the inner wall of the bottom of the first arc barrier 6 and the outer wall of the stationary contact leading-out terminal 21. Specifically, the first gap 60 is disposed between the inner peripheral wall of the bottom of the first arc barrier 6 and the outer peripheral wall of the bottom of the stationary contact leading-out terminal 21.

[0336] The connection between the bottom end face and the inner wall face of the first arc barrier 6 is an edge, and the arc moves to the edge to form an arc concentration. Meanwhile, due to the existence of the first gap 60, a part of the arc may enter the first gap 60, resulting in a height drop in the arc transfer path. The drop makes it difficult for the arc to move further in the direction away from the movable contact piece 22. The combination of the edge and the drop is used to impede arc transfer.

[0337] In one embodiment, one end of the first gap 60 facing the movable contact piece 22 is provided with an open end, and one end of the first gap 60 away from the movable contact piece 22 is a closed end.

[0338] The open end of the first gap 60 is used for introducing the arc, and the first gap 60 is provided with the closed end, such that the first gap 60 is not a fully through structure, thereby a bend can be formed in the arc path.

[0339] It should be particularly noted that the arc barrier structure provided in this embodiment may include the first arc barrier 6, the first step 61 and the first gap 60. The first step 61 and the first gap 60 form a partial arc barrier structure, which is configured to restrict the arc from transferring along the stationary contact leading-out terminal 21 toward the direction away from the movable contact piece 22 and also restrict the arc from transferring toward the central line of the movable contact piece 22. The first arc barrier 6 made of an insulating material has the performance of arc breaking or arc cooling, so as to achieve the effect of arc extinguishing.

[0340] In one embodiment, as shown in FIG. 52, one of the inner wall of the first arc barrier 6 and the outer wall of the stationary contact leading-out terminal 21 is provided with a positioning part 62, the other of the inner wall of the first arc barrier 6 and the outer wall of the stationary contact leading-out terminal 21 is provided with an fitting part 211, and the positioning part 62 is engaged with the fitting part 211.

[0341] When the first arc barrier 6 is mounted on the stationary contact leading-out terminal 21, the positioning part 62 and the fitting part 211 may perform initial positioning on the first arc barrier 6, improving the mounting accuracy of the first arc barrier 6. Meanwhile, the positioning part 62 is engaged with the fitting part 211 to fix the first arc barrier 6 and prevent the first arc barrier 6 from falling off.

[0342] The positioning part 62 and the fitting part 211 may be a stop step, an annular positioning groove or a positioning protrusion disposed on the stationary contact leading-out terminal 21, for example: the positioning part 62 is an annular clamping block disposed on the inner wall of the first arc barrier 6, the fitting part 211 is an annular clamping groove disposed on the outer wall of the stationary contact leading-out terminal 21, and the annular clamping block is engaged with the annular clamping groove. The positioning part 62 and the fitting part 211 provided in this embodiment are not limited to other forms, and any structure that can realize the positioning and fixing of the first arc barrier 6 relative to the stationary contact leading-out terminal 21 falls within the protection scope of this embodiment.

[0343] In one embodiment, as shown in FIG. 52, a first guiding gap 63 is disposed between the inner wall of the top at one end of the first arc barrier 6 away from the movable contact piece 22 and the outer wall of the corresponding stationary contact leading-out terminal 21, and the first guiding gap 63 is configured to guide the stationary contact leading-out terminal 21.

[0344] Since the first arc barrier 6 needs to be sleeved on the outer wall of the stationary contact leading-out terminal 21 from the bottom of the stationary contact leading-out terminal 21 when the first arc barrier 6 is mounted on the stationary contact leading-out terminal 21, the inner wall of the top of the first arc barrier 6 and the outer wall of the stationary contact leading-out terminal 21 are not attached to each other. A first guiding gap 63 is disposed between the inner wall of the top of the first arc barrier 6 and the outer wall of the stationary contact leading-out terminal 21, and the first guiding gap 63 is configured to provide a guiding effect for the first arc barrier 6, facilitating the mounting of the first arc barrier 6.

[0345] It can be understood that the first guiding gap 63 may be of a horn-shaped structure, the large opening end of the first gap 60 is disposed facing away from the movable contact piece 22, and the large opening end of the first gap 60 serves as an inlet for the bottom of the stationary contact leading-out terminal 21 to pass through, further improving the mounting convenience of the first arc barrier 6.

[0346] In one embodiment, as shown in FIG. 53, the second arc barrier 8 is made of an insulating material.

[0347] Specifically, the second arc barrier 8 may be made of insulating materials such as ceramics, glass, rubber or plastic. The second arc barrier 8 made of the insulating material has good arc extinguishing or arc cooling performance, with strong arc extinguishing capacity and good arc extinguishing effect.

[0348] It can be understood that in some other embodiments, the second arc barrier 7 may also be made of a metal material.

[0349] In one embodiment, the second arc barrier 8 is sleeved on an outer wall of the movable contact piece 22.

[0350] The second arc barrier 8 may also be an arc barrier sleeve. The second arc barrier 8 is sleeved on the outer wall of the movable contact piece 22 to perform arc isolation treatment on an outer peripheral side of a contact area corresponding to the movable contact of the movable contact piece 22, which can achieve a more comprehensive arc isolation and is conducive to arc extinguishing.

[0351] It can be understood that the number of the first arc barriers 8 is two, and the two first arc barriers 8 are respectively disposed at two ends of the movable contact piece 22 along the length direction of the movable contact piece 22.

[0352] In this way, the two sets of fixed and movable contacts between the movable contact piece 22 and the stationary contact leading-out terminal 21 correspond to the two first arc barriers 8 respectively, so that each set of fixed and movable contacts may use a corresponding second arc barrier 8 for arc isolation, which can achieve double arc extinguishing and improve the thoroughness of the arc extinguishing.

[0353] In one embodiment, as shown in FIGS. 53-59, a second step 71 is disposed between the second arc barrier 8 and the movable contact piece 22 and configured to impede the arc transfer; and / or, a second gap 72 is disposed between the second arc barrier 8 and the movable contact piece 22 and configured to impede the arc transfer.

[0354] A second step 71 and / or a second gap 72 is disposed at the contact position between the second arc barrier 8 and the movable contact piece 22 and on the moving path of the arc, that is, a bend is formed on the arc path, which can consume kinetic energy of the arc and block the transfer of the arc better. The arc transfer direction has two aspects: first, the second step 71 and / or the second gap 72 can block the arc from transferring toward the direction where the pair of stationary contact leading-out terminals 21 face each other, avoiding the occurrence of arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21; second, the second step 71 and / or the second gap 72 can block the arc from transferring downward along the movable contact piece 22 in the direction away from the stationary contact leading-out terminals 21, further reducing the ablation of the outer wall of the movable contact piece 22 by the arc, improving the arc extinguishing capacity and effect, and thus enhancing the interruption capacity between the movable contact and the stationary contact corresponding to the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0355] In one embodiment, portions of the movable contact pieces 22 in contact with the pair of stationary contact leading-out terminals 21 are two first contact parts 220, and the second step 71 and / or the second gap 72 is disposed between inner edges of the two first contact parts 220.

[0356] Specifically, the two first contact part 220 specifically includes two sets of movable contacts. Since the arc is generated at the portion where the movable contact piece 22 is in contact with the pair of stationary contact leading-out terminals 21, the second step 71 and / or the second gap 72 is disposed between the inner edges of the two first contact parts 220, and the second step 71 and / or the second gap 72 can cut off the path of the arc transferring to the inner side, avoiding the occurrence of arc short-circuit between the two sets of movable and stationary contacts.

[0357] In one embodiment, as shown in FIGS. 53-59, the second arc barrier 8 includes a column 70. A top surface at one end of the column 70 facing the stationary contact leading-out terminal 21 extends beyond a top surface at one end of the movable contact piece 22 facing the stationary contact leading-out terminal 21, so that a second step 71 is formed between the top surface of the column 70 and the top surface of the movable contact piece 22.

[0358] Since the top surface of the column 70 in the second arc barrier 8 extends beyond the top surface of the movable contact piece 22, the top of the column 70 and the top surface of the movable contact piece 22 are not arranged on a common plane, or the column 70 is not embedded within the top surface of the movable contact piece 22, thus the second step 71 is formed between the top surface of the movable contact piece 22 and the top of the column 70 extending beyond thereto. The second step 71 is closer to the arc initiation point, thereby isolating and cutting off a transfer path of the arc on the top surface of the movable contact piece 22 and impeding the arc from transferring to a center line of the movable contact piece 22 along the length direction, avoiding the short circuit of the arc generated by the two sets of fixed and movable contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, enabling the arc to be extinguished efficiently on the originally set arc extinguishing path of the magnetic blow-out field and improving the arc extinguishing capacity.

[0359] In one embodiment, a mounting groove 223 is disposed on the side wall of the movable contact piece 22, the column 70 is at least partially disposed within the mounting groove 223, and a second gap 72 is disposed between the column 70 and the mounting groove 223.

[0360] The mounting groove 223 is disposed on the side wall of the movable contact piece 22, and the mounting groove 223 not only provides an accommodating space for the column 70 but also functions to mount the column 70. The outer wall of the column 70 and the inner wall of the mounting groove 223 are not attached to each other, and the second gap 72 is disposed between the outer wall of the column 70 and the inner wall of the mounting groove 223. Due to the existence of the second gap 72, a part of the arc can enter the second gap 72. The second gap 72 provides an accommodating space for the arc, which can reduce the risk of the part of the arc transferring along the movable contact piece 22 in the direction away from the stationary contact leading-out terminal 21 and improve the arc extinguishing effect.

[0361] In one embodiment, one end of the second gap 72 facing the stationary contact leading-out terminal 21 is provided with an open end, and one end of the second gap 72 facing away from the stationary contact leading-out terminal 21 is a closed end.

[0362] The open end of the second gap 72 is configured to introduce an arc, and the second gap 72 is provided with a closed end. The second gap 72 is a non-fully penetrating structure, so that a bend may be formed in the arc path.

[0363] In one embodiment, as shown in FIGS. 53-59, the mounting groove 223 includes a first mounting portion 2231. The first mounting portion 2231 is disposed at the side of the movable contact piece 22 facing the stationary contact leading-out terminal 21. The column 70 is inserted into the first mounting portion 2231. The second gap 72 is disposed between the column 70 and the first mounting portion 2231. The second gap 72 is disposed along an axial direction of the column 70.

[0364] The first mounting portion 2231 is disposed on the side wall of the movable contact piece 22, and also on one side of the movable contact piece 22 facing the stationary contact leading-out terminal 21, that is, the first mounting portion 2231 is located at an upper part of the side wall of the movable contact piece 22. The second gap 72 is disposed between the first mounting portion 2231 and the column 70. Since the second gap 72 is closer to a position where the movable contact piece 22 is in contact with the stationary contact leading-out terminal 21, enabling a part of the arc to enter the second gap 72 directly.

[0365] In addition, a connection between the top surface and the side surface of the column 70 is an edge, and the arc moves to the edge to form an arc concentration. Meanwhile, due to the existence of the second gap 72, a part of the arc may enter the second gap 72, resulting in a height drop in the arc transfer path. The drop makes it difficult for the arc to move further toward the direction away from the stationary contact leading-out terminal 21. The combination of the edge and the drop can improve the arc extinguishing effect.

[0366] In one embodiment, the second gap 72 is a horn-shaped structure with a large opening end disposed facing the stationary contact leading-out terminal 21.

[0367] In one embodiment, as shown in FIGS. 53-59, the mounting groove 223 further includes a fixing portion 2232. The fixing portion 2232 is in communication with the first mounting portion 2231, and the column 70 is engaged with the fixing portion 2232 to fix the second arc barrier 8.

[0368] Specifically, the column 70 is engaged with the fixing portion 2232, that is, the outer wall of the column 70 is attached to or in an interference fit with the inner wall of the fixing portion 2232. The fixing portion 2232 functions to clamp and fix the column 70, to avoid the disengagement of the second arc barrier 8 from the movable contact piece 22.

[0369] In one embodiment, as shown in FIGS. 53-59, the mounting groove 223 further includes a second mounting portion 2233. The second mounting portion 2233 is disposed at the side of the movable contact piece 22 away from the stationary contact leading-out terminal 21. The second mounting portion 2233 is in communication with the first mounting portion 2231 through the fixing portion 2232. The column 70 is inserted into the second mounting portion 2233. A first guiding gap 73 is disposed between the outer wall of the column 70 and the inner wall of the second mounting portion 2233. The first guiding gap 73 is configured to guide the column 70.

[0370] The second mounting portion 2233 is disposed at a side of the movable contact piece 22 away from the stationary contact leading-out terminal 21, that is, the second mounting portion 2233 is located at the lower part of the side wall of the movable contact piece 22. The first guiding gap 73 is disposed between the first mounting portion 2231 and the column 70. The first guiding gap 73 is configured to guide the column 70. Since the column 70 needs to pass through the mounting groove 223 of the movable contact piece 22 from the bottom of the movable contact piece 22 when the second arc barrier 8 is mounted on the movable contact piece 22, the first guiding gap 73 is disposed between the outer wall of the column 70 and the inner wall of the second mounting portion 2233, that is, the outer wall of the column 70 and the inner wall of the second mounting portion 2233 are not attached to each other. The first guiding gap 73 is used to provide a guiding effect for the column 70, facilitating the mounting of the column 70 of the second arc barrier 8.

[0371] It can be understood that the first guiding gap 73 may be a horn-shaped structure with a large opening end disposed facing away from the stationary contact leading-out terminal 21. The large opening end of the second gap 72 serves as an inlet for the passage of the column 70, which further improves the mounting convenience of the second arc barrier 8.

[0372] In one embodiment, the number of the columns 70 is two. The two mounting grooves 223 are disposed on both sides of the movable contact piece 22 along the width direction of the movable contact piece 22 and between the inner edges of the first contact part 220. The two columns 70 are disposed corresponding to the two mounting grooves 223.

[0373] Specifically, the two columns 70 are disposed correspondingly along the width direction of the movable contact piece 22. The two columns 70 may completely cut off the transfer path of the arc toward the direction where the pair of stationary contact leading-out terminals 21 face each other, which can achieve good arc isolation effect.

[0374] In one embodiment, as shown in FIGS. 53-59, the second arc barrier 8 further includes a limiting part 74. The limiting part 74 is disposed at the side of the column 70 away from the movable contact piece 22 and may abut against the movable contact piece 22 to limit the column 70.

[0375] When the second arc barrier 8 is mounted to the movable contact piece 22, the limiting part 74 may abut against the movable contact piece 22 to perform initial positioning and limiting on the column 70 of the second arc barrier 8, and improve the mounting accuracy of the second arc barrier 7.

[0376] In one embodiment, the second arc barrier 7 further includes an arc barrier ring 75. The arc barrier ring 75 wraps the end of the movable contact piece 22 along the length direction of the movable contact piece 22 and at least part of the side wall of the movable contact piece 22.

[0377] The arc barrier ring 75 of the second arc barrier 8 wraps the end of the movable contact piece 22 and at least part of the side wall of the movable contact piece 22, which is equivalent to mounting an arc barrier sleeve on the outer peripheral side of the contact area between the stationary contact leading-out terminal 21 and the movable contact piece 22, which can reduce the ablation of the outer wall of the movable contact piece 22 by the arc and impede the arc from transferring downward along the side wall of the movable contact piece 22, and is conducive to arc extinguishing. In addition, the arc barrier ring 75 is a hollow structure, that is, a central hole is disposed at a center of the arc barrier ring 75, and the arc barrier ring 75 functions to reduce weight, to meet the requirement of lightweight.

[0378] In one embodiment, as shown in FIGS. 53-59, the second arc barrier 8 further includes a connecting part 76. The connecting part 76 is disposed at the bottom of one end of the movable contact piece 22 away from the stationary contact leading-out terminal 21 and connected to both ends of the arc barrier ring 75 respectively. The column 70 is disposed on the connecting part 76.

[0379] If the arc barrier ring 75 has an open end, the arc barrier ring 75 is an open structure. The connecting part 76 is connected to both ends of the arc barrier ring 75 respectively, so that the second arc barrier 8 is an integrated structure to improve the fixing effect between the second arc barrier 8 and the movable contact piece 22. Meanwhile, the connecting part 76 is located at the bottom of the movable contact piece 22 and may not interfere with the mutual contact between the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0380] It should be specially noted that the relay contact assembly 2 provided in this embodiment may be provided with the second arc barrier 8, the second step 71 and the second gap 72 simultaneously. The second step 71 and the second gap 72 form a partial arc barrier structure for restricting part of the arc or the arc from transferring along the movable contact piece 22 toward the direction away from the stationary contact leading-out terminal 21 and restricting part of the arc from transferring along the movable contact piece 22 toward the direction in which the pair of stationary contact leading-out terminals 21 face each other. The second arc barrier 8 made of the insulating material has the performance of arc breaking or arc cooling to achieve the effect of arc extinguishing.

[0381] It can be understood that, in the relay contact assembly 2 provided in this embodiment, the first arc barrier 6 may impede the arc from transferring upward along the outer wall of the stationary contact leading-out terminal 21, the second arc barrier 8 may impede the arc from transferring downward along the outer wall of the movable contact piece 22, and meanwhile, under the combined action of the first arc barrier 6 and the second arc barrier 8, the arc is impeded from transferring toward the direction where the pair of stationary contact leading-out terminals 21 face each other, so as to limit the transfer range of the arc between the movable contact piece 22 and the stationary contact leading-out terminal 21, which can achieve more comprehensive arc isolation, impede the transfer of the arc, and improve the arc extinguishing performance.

[0382] This embodiment also provides a relay, which includes the aforementioned relay contact assembly 2.

[0383] In the relay provided in this embodiment, the movable contact piece 22 of the relay contact assembly 2 is contacted with or separated from a pair of stationary contact leading-out terminals 21; when the movable contact piece 22 is in contact with the stationary contacts at the bottoms of the pair of stationary contact leading-out terminals 21, current flows in from one stationary contact leading-out terminal 21 and flows out from the other stationary contact leading-out terminal 21 after passing through the movable contact piece 22, thereby achieving load connection. The first arc barrier 6 can impede the arc from transferring upward along the outer wall of the stationary contact leading-out terminal 21, the second arc barrier 8 can impede the arc from transferring downward along the outer wall of the movable contact piece 22, and under the combined action of the first arc barrier 6 and the second arc barrier 8, the transfer range of the arc is limited between the movable contact piece 22 and the stationary contact leading-out terminal 21, which can achieve more comprehensive arc isolation, impede the arc transfer, and improve the thoroughness of arc extinguishing.

[0384] In one embodiment, as shown in FIGS. 48-60, the relay provided in this embodiment further includes a contact container 1. The contact container 1 includes an insulating cover 11. The movable contact piece 22 is disposed within the insulating cover 11. The stationary contact leading-out terminal 21 is inserted into the insulating cover 11 and at least partially disposed in the insulating cover 11.

[0385] The insulating cover 11 and the yoke plate are connected by a frame piece 12, and the insulating cover 11 and the yoke plate enclose a contact chamber. The contact chamber provides an arc isolation environment for the contact between the movable contact piece 22 and the stationary contact leading-out terminal 21, to ensure the reliability of the relay during use.

[0386] In one embodiment, the first arc barrier 6 is disposed outside the portion of the stationary contact leading-out terminal 21 located inside the insulating cover 11. The first arc barrier 6 isolates and protects the portion of the stationary contact leading-out terminal 21 located inside the insulating cover 11.

[0387] In one embodiment, as shown in FIGS. 61-62, one surface of the movable contact piece 22 provided in this embodiment facing the stationary contact leading-out terminal 21 is a top surface of the movable contact piece 22. An arc barrier portion is provided on the top surface of the movable contact piece 22 and is configured to impede the movement of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other.

[0388] The arc barrier portion is disposed on the top surface of the movable contact piece 22 to impede the transfer of the arc along the top surface of the movable contact piece 22, thereby isolating and cutting off the transfer path of the arc on the top surface of the movable contact piece 22, and impeding the transfer of the arc toward a center line of the movable contact piece 22 in a length direction, avoiding the arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, enabling the arc to be extinguished efficiently along the originally set arc extinguishing path of the magnetic blow-out field, and improving the arc extinguishing capability.

[0389] In one embodiment, the arc barrier portion is disposed between the inner edges of the two first contact parts 220.

[0390] A portion where the movable contact piece 22 is in contact with the pair of stationary contact leading-out terminals 21 is the first contact part 220, and the arc barrier portion is disposed between the inner edges of the first contact part 220, to cut off the path of arc transferring toward an inner side of the stationary contact leading-out terminals 21, avoid the arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, and ensure the high efficiency and thoroughness of arc extinguishing.

[0391] It should be particularly noted that the inner side specifically refers to a side where the pair of stationary contact leading-out terminals 21 face each other (as shown in FIG. 47, Q refers to a direction in which the pair of stationary contact leading-out terminals 21 face each other), or a side close to the center line W of the movable contact piece 22 in the length direction (as shown in FIG. 61, L refers to a length direction of the movable contact piece 22, and T refers to a width direction of the movable contact piece 22). Therefore, the arc barrier portion is disposed on the side of the first contact part 220 facing the inner side, or the arc barrier part is disposed between the central lines of the two stationary contact leading-out terminals 21 (as shown in FIG. 47, M refers to the central line of the stationary contact leading-out terminal 21).

[0392] It can be understood that at least a part of the first step 61 and / or the first gap 60 is disposed between the inner edges of the first contact part 220.

[0393] In one embodiment, as shown in FIGS. 61-62, the arc barrier portion is a first arc barrier groove 222; and / or, the arc barrier portion is an arc barrier rib 225.

[0394] The arc barrier portion is the first arc barrier groove 222, that is, a recessed structure is provided on the top surface of the movable contact piece 22; the arc barrier portion is the arc barrier rib 225, that is, a protruding structure is provided on the top surface of the movable contact piece 22. These two structures can solve a problem of rapid arc transfer that may occur on the top surface of the movable contact piece 22 with a planar structure. The first arc barrier groove 222 and / or the arc barrier rib 225 can isolate and cut off the path of the arc transferring on the top surface of the movable contact piece 22, and impede the transfer of the arc toward the center line of the movable contact piece 22 in the length direction, avoiding arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21.

[0395] Specifically, the first arc barrier groove 222 includes a first groove wall and a first groove bottom that are connected to each other. The arc moves to the connection between the first groove wall and the top surface of the movable contact piece 22 to form an arc concentration. A height difference between the top surface of one side of the movable contact piece 22 facing the stationary contact leading-out terminal 21 and the first groove bottom is used to impede the movement of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other.

[0396] Since the first arc barrier groove 222 has a first groove wall and a first groove bottom connected with each other, the connection between the first groove wall and the top surface of the movable contact piece 22 is an edge. The arc moves to the edge to form the arc concentration. Meanwhile, the height difference between the top surface of the movable contact piece 22 and the first groove bottom creates a drop on the arc transfer path, which can prevent the arc from easily moving toward the center line of the movable contact piece 22 in the length direction, and the combination of the edge and the drop can improve the arc extinguishing effect.

[0397] In one embodiment, as shown in FIG. 61, the first arc barrier groove 222 is a through groove extending along a width direction of the movable contact piece 22.

[0398] If the first arc barrier groove 222 extends along the length direction of the movable contact piece 22, the arc may transfer along the portion of the top surface of the movable contact piece 22 where the first arc barrier groove 222 is not provided, resulting in a risk of arc short-circuit. Therefore, the first arc barrier groove 222 is configured as a through groove along the width direction of the movable contact piece 22. Since the through groove is arranged to penetrate the width direction of the movable contact piece 22, after the arc enters the first arc barrier groove 222, the transfer path of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other is completely cut off.

[0399] In one embodiment, as shown in FIGS. 61-62, the number of the arc barrier parts is two, the two arc barrier parts are disposed in a one-to-one correspondence with the pair of stationary contact leading-out terminals 21, and the arc barrier parts are disposed on one side of the pair of stationary contact leading-out terminals 21 that face each other.

[0400] Specifically, since the number of the stationary contact leading-out terminals 21 is two, the two first arc barrier grooves 222 are disposed in a one-to-one correspondence with the two stationary contact leading-out terminals 21 and on the inner sides of the stationary contact leading-out terminals 21, such that the arc generated by the separation of the two sets of movable and stationary contacts is subjected to arc isolation through the two first arc barrier grooves 222 in a corresponding manner, which can achieve a dual arc isolation effect and further improve the arc isolation performance.

[0401] In one embodiment, the first arc barrier groove 222 has an arc-shaped structure, and the first arc barrier groove 222 is arranged around the stationary contact leading-out terminal 21.

[0402] Specifically, since the bottom of the stationary contact leading-out terminal 21 is similar to a cylindrical structure, the shape of the first arc barrier groove 222 is adapted to an outer contour of the bottom of the stationary contact leading-out terminal 21. The first arc barrier groove 222 with the arc-shaped structure is arranged along the outer contour of the stationary contact leading-out terminal 21 and around the stationary contact leading-out terminal 21, to impede the arc transfer path in all directions.

[0403] It can be understood that the first arc barrier groove 222 with the arc-shaped structure extends from one side to the other side of the movable contact piece 22 along the width direction, so that contact parts are formed on the portions at both ends of the movable contact piece 22 along the length direction where the first arc barrier groove 222 is not provided, and the contact parts are used for contacting the stationary contact leading-out terminal 21.

[0404] It should be particularly noted that, as shown in FIGS. 61-62, the first arc barrier groove 222 may be replaced by the arc barrier rib 225, and the arrangement position and shape of the arc barrier rib 225 are similar to those of the first arc barrier groove 222, which will not be repeated.

[0405] This embodiment also provides a relay, including the relay contact assembly 2 as described above.

[0406] In the relay provided in this embodiment, the movable contact piece 22 and the pair of stationary contact leading-out terminals 21 of the relay contact assembly 2 are contacted with or separated from one another. When the movable contact piece 22 comes into contact with the stationary contacts at the bottom of the pair of stationary contact leading-out terminals 21, current flows in from one stationary contact leading-out terminal 21, passes through the movable contact piece 22 and then flows out of the other stationary contact leading-out terminal 21, thereby connecting the load.

[0407] In one embodiment, as shown in FIGS. 60, 63-64, the relay further includes a push assembly 4, which includes a push rod unit 41, an elastic member 43 and a U-shaped bracket 42. The push rod unit 41 includes a base 413 and a push rod 411, and the base 413 and an upper part of the push rod 411 may be integrally injection-molded. The U-shaped bracket 42 and the base 413 enclose a frame structure, the movable contact piece 22 and the elastic member 43 are mounted within the frame structure enclosed by the U-shaped bracket 42 and the base 413. One end of the elastic member 43 abuts against the base 413, and the other end of the elastic member 43 abuts against the movable contact piece 22. The elastic member 43 may provide an elastic force, so that the movable contact piece 22 has a tendency to move away from the base 413 and approach the stationary contact leading-out terminal 21.

[0408] Specifically, the push rod unit 41 and the U-shaped bracket 42 are matched through the limiting protrusion 412 and the limiting hole. A moving force of the push rod unit 41 may be transmitted to the U-shaped bracket 42 for driving the movement of the movable contact piece 22, so that the movable contact piece 22 can be contacted with or separated from the pair of stationary contact leading-out terminals 21.

[0409] As shown in FIGS. 60, 63-64, the push assembly 4 of the relay further includes an electromagnet unit 44, which is disposed on a side of a yoke plate facing away from the insulating cover 11. The push rod unit 41 is drivenly connected to the electromagnet unit 44, and the push rod unit 41 is movably disposed in a driving chamber enclosed by a metal cover and the yoke plate, and abuts against the movable contact piece 22 through a via hole of the yoke plate. When the electromagnet unit 44 is energized, the push rod unit 41 may be driven to move, to further drive the movable contact piece 22 to move, so as to contact with or separate from the stationary contact leading-out terminal 21.

[0410] The electromagnet unit 44 includes a coil bobbin 441, a coil 442, a stationary core 444, a movable core 443, a U-shaped yoke 445, a magnetic sleeve 446 and a spring 447. The coil bobbin 441 is disposed within the U-shaped yoke 445, the coil bobbin 441 is in a hollow cylindrical shape and made of an insulating material. The magnetic sleeve 446 penetrates through and is disposed within the coil bobbin 441, and the coil 442 is wound around the coil bobbin 441. The stationary core 444 is provided with a second perforation that is arranged corresponding to the via hole of the yoke plate, through which the push rod unit 41 may pass. The movable core 443 is movably disposed within the magnetic sleeve 446 and arranged opposite to the stationary core 444. The spring 447 is disposed between the stationary core 444 and the movable core 443 and is capable of abutting against each of them. The movable core 443 is connected to the push rod unit 41 and configured to be attracted by the stationary core 444 when the coil 442 is energized. The movable core 443 and the push rod unit 41 may be connected by screwing, riveting, welding or other means.

[0411] The working process of the relay provided in this embodiment is as follows: When the coil 442 is energized, the stationary core 444 attracts the movable core 443, the movable core 443 drives the push rod unit 41 to move upward, the spring 447 between the stationary core 444 and the movable core 443 is compressed, and the push rod unit 41 pushes the movable contact piece 22 to move by means of the U-shaped bracket 42 and the elastic member 43, so that the two ends of the movable contact piece 22 are respectively in contact with the two stationary contact leading-out terminals 21, to close the movable and stationary contacts.

[0412] When the current of the coil 442 is interrupted, the stationary core 444 releases the attraction to the movable core 443. Under the elastic force of the compressed spring 447, the movable core 443 drives the push rod unit 41 to move downward, so that the movable contacts at the two ends of the movable contact piece 22 are separated from the two stationary contact leading-out terminals 21, to separate the movable and stationary contacts.

[0413] In one embodiment, as shown in FIGS. 60, 63-64, the relay further includes an arc extinguishing unit 5, which is disposed within a hollow chamber of the housing and configured to extinguish the arc of the contact assembly 2. The arc extinguishing unit 5 includes two arc extinguishing magnets 51. The arc extinguishing magnets 51 may be permanent magnets, and each arc extinguishing magnet 51 may substantially be a cuboid. The two arc extinguishing magnets 51 are respectively disposed on both sides of the insulating cover 11 and oppositely arranged along the length direction of the movable contact piece 22.

[0414] In this embodiment, the two arc extinguishing magnets 51 are respectively located on the left and right sides of the insulating cover 11. The surfaces facing to one another of the two arc extinguishing magnets 51 have opposite polarities. That is to say, a left surface of the arc extinguishing magnet 51 on the left side of the insulating cover 11 is an S pole and a right surface thereof is an N pole, and the left surface of the arc extinguishing magnet 51 on the right side of the insulating cover 11 is an S pole and the right surface thereof is an N pole.

[0415] Certainly, the surfaces facing to one another of the two arc extinguishing magnets 51 may also be designed to have the same polarity. For example, the left surface of the arc extinguishing magnet 51 on the left side of the insulating cover 11 is an S pole and the right surface thereof is an N pole, and the left surface of the arc extinguishing magnet 51 on the right side of the insulating cover 11 is an N pole and the right surface thereof is an S pole.

[0416] By arranging two oppositely disposed arc extinguishing magnets 51, a magnetic field may be formed around the contact assembly 2.

[0417] Therefore, the arc generated between the stationary contact leading-out terminal 21 and the movable contact piece 22 may be elongated in the direction away from each other under the action of the magnetic field, thereby realizing arc extinguishing.

[0418] The arc extinguishing unit 5 further includes two yoke clamps 52, which are arranged in positions corresponding to the two arc extinguishing magnets 51. Moreover, the two yoke clamps 52 surround the insulating cover 11 and the two arc extinguishing magnets 51. The design of the yoke clamps 52 surrounding the arc extinguishing magnets 51 can prevent the magnetic field generated by the arc extinguishing magnets 51 from diffusing outward and affecting the arc extinguishing effect. The yoke clamps 52 are made of soft magnetic materials. The soft magnetic materials may include but are not limited to iron, cobalt, nickel and the alloys thereof, etc.

[0419] When the short-circuit load is large, under the action of the short-circuit current, an electro-dynamic repulsive force is generated between the movable contact piece 22 and the stationary contact leading-out terminal 21, causing the contacts to bounce open, which leads to the arc generation between the contacts and violent burning thereof, and even explosion may occur.

[0420] To this end, as shown in FIGS. 47-53, the relay provided in this embodiment further includes a short-circuit resistant assembly 3, which is disposed at least on one side of the movable contact piece 22 along the axial direction of the stationary contact leading-out terminal 21 and generates a suction force when a high fault current occurs in the movable contact piece 22, for resisting the electro-dynamic repulsive force between the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0421] The short-circuit resistant assembly 3 may also be a short-circuit ring disposed between the pair of stationary contact leading-out terminals 21. For a high-voltage DC relay, the first arc barrier 6 may prevent the arc from being attracted by the short-circuit resistant assembly 3 and thus moving toward the direction where the pair of stationary contact leading-out terminals 21 face each other, avoiding the decrease in insulation between the contacts or arc short-circuiting.

[0422] The axial direction of the stationary contact leading-out terminal 21, the length direction of the movable contact piece 22 and the width direction of the movable contact piece 22 are perpendicular to each other.

[0423] Specifically, the thrust part 221 of the movable contact piece 22 is disposed between the two contact parts, and the short-circuit resistant assembly 3 is disposed on the thrust part 221 of the movable contact piece 22. Both sides of the thrust part 221 are of a planar structure, and the bilateral planes of the thrust part 221 provide mounting convenience and reliability for the short-circuit resistant assembly 3. The short-circuit resistant assembly 3 is configured to resist the electro-dynamic repulsive force between the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0424] In one embodiment, as shown in FIGS. 47-53, the short-circuit resistant assembly 3 includes an upper magnetic conductor 31 and a lower magnetic conductor 32, the upper magnetic conductor 31 is disposed on one side of the movable contact piece 22 facing the stationary contact leading-out terminal 21, and the lower magnetic conductor 32 is at least partially disposed on one side of the movable contact piece 22 facing away from the stationary contact leading-out terminal 21, so as to form a magnetic conductive circuit between the upper magnetic conductor 31 and the lower magnetic conductor 32. The upper magnetic conductor 31 and the lower magnetic conductor 32 may be made of materials such as iron, cobalt, nickel and their alloys.

[0425] The upper magnetic conductor 31 is disposed on one side of the thrust part 221 facing the stationary contact leading-out terminal 21, and the lower magnetic conductor 32 is disposed on one side of the thrust part 221 facing away from the stationary contact leading-out terminal 21, that is, the lower magnetic conductor 32 is fixed below the thrust part 221 of the movable contact piece 22. A magnetic conductive circuit may be formed between the upper magnetic conductor 31 and the lower magnetic conductor 32, and the lower magnetic conductor 32 may move together with the movable contact piece 22 toward the direction close to the stationary contact leading-out terminal 21. When a high fault current occurs in the movable contact piece 22, since the upper magnetic conductor 31 is located above the movable contact piece 22 and the lower magnetic conductor 32 is located below the movable contact piece 22, the movable contact piece 22 is clamped between the two magnets of the upper magnetic conductor 31 and the lower magnetic conductor 32. When the upper magnetic conductor 31 generates a suction force on the lower magnetic conductor 32, the suction force acts to attract and pull the movable contact piece 22, and is used to resist the electro-dynamic repulsive force generated by the fault current between the movable contact piece 22 and the stationary contact leading-out terminal 21, avoiding the arcing and explosion caused by the separation between the movable contact piece 22 and the stationary contact leading-out terminal 21, and ensuring the reliability and safety of the contact between the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0426] In one embodiment, the upper magnetic conductor 31 may be of a linear structure, and is disposed at a position corresponding to between the two contact parts of the movable contact piece 22, and the upper magnetic conductor 31 may extend along the width direction of the movable contact piece 22, for the matching and correspondence of the upper magnetic conductor 31 and the lower magnetic conductor 32. The lower magnetic conductor 32 is of a U-shaped structure, and the opening of the lower magnetic conductor 32 is disposed toward the movable contact piece 22, such that the two side arms of the lower magnetic conductor 32 extend toward the upper magnetic conductor 31, so that the two side arms of the lower magnetic conductor 32 may be close to or in contact with the two ends of the upper magnetic conductor 31 respectively, so as to form a surrounding magnetic conductive ring on the movable contact piece 22 along its width direction. Since the contact parts at the two ends of the movable contact piece 22 along its length direction are movable contacts, the surrounding magnetic conductive ring formed along the width direction of the movable contact piece 22 may not cause interference. When a high fault current occurs in the movable contact piece 22, an electromagnetic suction force in the direction of the movable contact pressure is generated to resist the electro-dynamic repulsive force generated by the fault current between the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0427] The thrust part 221 of the movable contact piece 22 provided in this embodiment is provided with a through hole 2211, and the lower magnetic conductor 32 is at least partially inserted into the through hole 2211.

[0428] In this way, the thrust part 221 of the movable contact piece 22 provides a mounting and fixing position for the lower magnetic conductor 32, so as to improve the fixing effect between the movable contact piece 22 and the lower magnetic conductor 32. Since the lower magnetic conductor 32 is of a similar U-shaped structure, the opening of the lower magnetic conductor 32 is disposed toward the thrust part 221 of the movable contact piece 22, one side arm of the lower magnetic conductor 32 wraps around a long side of the movable contact piece 22, and the other side arm of the lower magnetic conductor 32 is inserted into the through hole 2211.

[0429] In one embodiment, the number of the upper magnetic conductors 31 and the lower magnetic conductors 32 is multiple, the multiple upper magnetic conductors 31 are disposed in correspondence with the multiple lower magnetic conductors 32, and the sides of two adjacent lower magnetic conductors 32 close to each other are inserted into the through hole 2211.

[0430] The multiple upper magnetic conductors 31 are disposed in correspondence with the multiple lower magnetic conductors 32 to enhance the magnetic attraction effect between the upper magnetic conductors 31 and the lower magnetic conductors 32, further improve the effect of attracting and pulling the movable contact piece 22, and thus resist the electro-dynamic repulsive force generated by the fault current between the movable contact piece 22 and the stationary contact leading-out terminal 21.

[0431] For example, the number of the upper magnetic conductors 31 and the lower magnetic conductors 32 is two, the side walls of the two lower magnetic conductors 32 close to each other are inserted into the through hole 2211 simultaneously, and the same through hole 2211 is used to realize the mounting of the two lower magnetic conductors 32, which can reduce the production cost and assembly difficulty.

[0432] It should be particularly noted that the U-shaped bracket 42 may be fixedly connected to the upper magnetic conductor 31, the lower magnetic conductor 32 is connected to the bottom of the movable contact piece 22, the movable contact piece 22 and the lower magnetic conductor 32 form a movable member, and the short-circuit resistant assembly 3 and the movable contact piece 22 are disposed between the U-shaped bracket 42 and the push rod unit 41.Eighth Embodiment

[0433] This embodiment is similar to the seventh embodiment, with the only difference in the structure of the first arc barrier groove 222.

[0434] As shown in FIGS. 65-67, the first arc barrier groove 222 provided in this embodiment has at least one of a linear structure, a convex structure and an X-shaped structure.

[0435] Specifically, as shown in FIG. 65, the first arc barrier groove 222 is of a linear structure with a simple structure and convenient production and processing. Moreover, since a width of the first arc barrier groove 222 along the length direction of the movable contact piece 22 is relatively narrow, the overall structural strength of the movable contact piece 22 is relatively high.

[0436] As shown in FIG. 66, the first arc barrier groove 222 has a convex structure, so that the first arc barrier groove 222 has a broken-line groove structure, which increases the tortuosity of the transfer path of the arc, thereby improving the arc extinguishing effect.

[0437] As shown in FIG. 67, the first arc barrier groove 222 has an X-shaped structure. The X-shaped structure includes two intersecting slots, so that the arc on each side can be blocked by the transfer path through the two slots, playing a dual arc isolation role with good isolation and arc extinguishing effects.

[0438] It can be understood that the two first arc barrier grooves 222 in this embodiment may have the same or different shapes. For example, one of the first arc barrier grooves 222 has a convex structure, and the other of the first arc barrier grooves 222 has a linear structure.

[0439] It can be understood that the first arc barrier groove 222 provided in this embodiment includes but is not limited to the linear structure and the X-shaped structure, and may also have an S-shaped structure, a tapered structure, etc. Its specific shape can be adjusted according to actual production conditions.

[0440] It should be particularly noted that, as shown in FIGS. 68-70, the first arc barrier groove 222 may be replaced by an arc barrier rib 225, and the arrangement position and shape of the arc barrier rib 225 are similar to those of the first arc barrier groove 222, which will not be repeated.Ninth Embodiment

[0441] This embodiment is similar to the seventh embodiment, with the only difference in the quantity and structure of the arc barrier portions.

[0442] As shown in FIGS. 71-72, the number of the arc barrier portions provided in this embodiment is one. the portion of the movable contact piece 22, which is not provided with the arc barrier portion, and portions on both sides of the movable contact piece 22 along the length direction are in contact with the pair of stationary contact leading-out terminals 21, respectively.

[0443] Specifically, since one first arc barrier groove 222 is disposed between the pair of stationary contact leading-out terminals 21, and the width of the first arc barrier groove 222 along the length direction of the movable contact piece 22 is relatively wide, the portions of the movable contact piece 22, which are not provided with the first arc barrier groove 222 and disposed on both ends along the length direction are respectively two contact parts. The two contact parts are respectively in contact with the pair of stationary contact leading-out terminals 21. The arc isolation process for the two sets of movable and stationary contacts can be realized by using one first arc barrier groove 222, which has a simple structure and relatively low production cost.

[0444] In one embodiment, as shown in FIGS. 71-72, a distance between the two side edges of the first arc barrier groove 222 along the length direction of the movable contact piece 22 is less than or equal to a distance between the bottoms of the pair of stationary contact leading-out terminals 21.

[0445] Specifically, the width of the first arc barrier groove 222 along the length direction of the movable contact piece 22 extends to a vicinity of the inner side edges of the bottoms of the stationary contact leading-out terminals 21 or is flush with the inner side edges of the bottoms of the stationary contact leading-out terminals 21, so that the edge between the first groove wall of the first arc barrier groove 222 and the top surface of the movable contact piece 22 is as close as possible to the bottoms of the stationary contact leading-out terminals 21. The arc can be concentrated at the edge as soon as possible, and the drop between the top surface of the movable contact piece 22 and the first groove bottom of the first arc barrier groove 222 is utilized to reduce the risk of the arc transferring toward the center line of the movable contact piece 22.

[0446] It should be particularly noted that, as shown in FIGS. 71-72, the first arc barrier groove 222 may be replaced by the arc barrier rib 225, and the arrangement position and shape of the arc barrier rib 225 are similar to those of the first arc barrier groove 222, which will not be repeated.Tenth Embodiment

[0447] This embodiment is similar to the seventh embodiment and the eighth embodiment, with the difference in that other detailed structures of the movable contact piece 22 are added on the basis of the first embodiment or the second embodiment.

[0448] In the movable contact piece 22 provided in this embodiment, a second arc barrier groove may also be provided on the side walls of the movable contact piece 22, and the second arc barrier grooves are configured to impede the movement of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other.

[0449] This embodiment provides a movable contact piece 22. The second arc barrier grooves are disposed on the side walls of the movable contact piece 22 to impede the arc transfer along the side walls of the movable contact piece 22 toward the center line of the movable contact piece 22 in the length direction, thereby isolating and cutting off the transfer path of the arc on the side walls of the movable contact piece 22, avoiding the arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, enabling the arc to be extinguished efficiently along the originally set arc extinguishing path of the magnetic blow-out field, and improving the arc extinguishing capability.

[0450] In one embodiment, the second arc barrier grooves are disposed between the center lines of the pair of the stationary contact leading-out terminals 21.

[0451] In other words, the second arc barrier grooves are disposed on the inner side of the stationary contact leading-out terminals 21, to cut off the transfer path of the arc toward the inner side of the stationary contact leading-out terminals 21, avoid the arc short-circuit between the two sets of movable and stationary contacts between the movable contact piece 22 and the pair of stationary contact leading-out terminals 21, and ensure the high efficiency and thoroughness of arc extinguishing.

[0452] In one embodiment, the number of the second arc barrier grooves is multiple, and the multiple second arc barrier grooves are disposed on both sides of the movable contact piece 22 along the length direction of the movable contact piece 22; and / or, the number of the second arc barrier grooves is multiple, and the multiple second arc barrier grooves are disposed on both sides of the movable contact piece 22 along the width direction of the movable contact piece 22.

[0453] Specifically, the number of the second arc barrier grooves is four, with two second arc barrier grooves provided on each side of the movable contact piece 22 along its length direction, and two second arc barrier grooves provided on each side of the movable contact piece 22 along its width direction. The four second arc barrier grooves are disposed at four corners of the thrust part 221 of the movable contact piece 22, so that the arc may be isolated by the second arc barrier grooves no matter in which directions the arc transfers along the side walls of the movable contact piece 22, which can improve the arc isolation effect.

[0454] In one embodiment, the second arc barrier groove includes a second groove wall and a second groove bottom that are connected to each other. The arc moves to the connection between the second groove wall and the side wall of the movable contact piece 22 to form an arc concentration. A height difference between the side wall of the movable contact piece 22 and the second groove bottom is used to impede the movement of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other.

[0455] Since the second arc barrier groove has the second groove wall and the second groove bottom connected with each other, the connection between the second groove wall and the side wall of the movable contact piece 22 is an edge. The arc moves to the edge to form an arc concentration. The height difference between the side wall of the movable contact piece 22 and the second groove bottom creates a drop on the arc transfer path along the side wall of the movable contact piece 22, which can prevent the arc from easily moving toward the center line of the movable contact piece 22 in the length direction, and the combination of the edge and the drop can improve the arc extinguishing effect.

[0456] In one embodiment, the second arc barrier groove is a through groove extending along the axial direction of the stationary contact leading-out terminal 21.

[0457] If the second arc barrier groove extends along the length direction of the movable contact piece 22, the arc can transfer along the part of the side wall of the movable contact piece 22 where the second arc barrier groove is not provided, resulting in a risk of arc short-circuit. Therefore, the second arc barrier groove is configured as a through groove extending along an axial direction of the stationary contact leading-out terminal 21. Since the through groove is arranged to penetrate a height direction of the movable contact piece 22, after the arc enters the second arc barrier groove, the transfer path of the arc toward the direction in which the pair of stationary contact leading-out terminals 21 face each other is completely cut off.

[0458] It should be noted herein that the movable contact piece shown in the accompanying drawings and described in the present specification is merely an example used in the principles of the present disclosure. Those skilled in the art should clearly understand that the principles of the present disclosure are not limited to any details or any components of the devices shown in the accompanying drawings or described in the specification.

[0459] It should be understood that the present disclosure is not limited to the detailed structure and arrangement of components set forth in this specification. The present disclosure may have other embodiments and may be implemented and carried out in various ways. The foregoing variations and modifications fall within the scope of the present disclosure. It should be understood that the present disclosure as disclosed and defined in this specification extends to all alternative combinations of two or more individual features mentioned herein and / or shown in the accompanying drawings. All such different combinations constitute various alternative aspects of the present disclosure. The embodiments described in this specification illustrate the best mode known for carrying out the present disclosure and will enable those skilled in the art to utilize the present disclosure.

[0460] Other embodiments of the present disclosure will be easily conceived by those skilled in the art upon consideration of the specification and practice of the contents disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or conventional technical means in the technical field which are not disclosed by the present disclosure. The specification and example embodiments are regarded as illustrative only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

[0461] It should be understood that the present disclosure is not limited to the precise structure that has been described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The protection scope of the present disclosure is limited only by the appended claims.

Examples

first embodiment

[0039]The present embodiment provides a contact unit. As shown in FIGS. 1-2, the contact unit includes a movable contact piece 22 and a pair of stationary contact leading-out terminals 21. The movable contact piece 22 is configured to contact with or separate from the pair of stationary contact leading-out terminals 21.

[0040]In the contact unit provided by the present embodiment, the movable contact piece 22 is contacted with or separated from the pair of stationary contact leading-out terminals 21. When the movable contact piece 22 comes into contact with stationary contacts at the bottom of the pair of stationary contact leading-out terminals 21, current flows in from one stationary contact leading-out terminal 21, passes through the movable contact piece 22 and then flows out of the other stationary contact leading-out terminal 21, thereby connecting a load.

[0041]In one embodiment, the stationary contact is provided at the bottom of the stationary contact leading-out terminal 21....

second embodiment

[0117]This embodiment is similar to the first embodiment, with the difference in the structure of the first arc barrier groove 222.

[0118]As shown in FIGS. 14-16, the first arc barrier groove 222 provided in this embodiment has at least one of a linear structure, a convex structure and an X-shaped structure.

[0119]Specifically, as shown in FIG. 14, the first arc barrier groove 222 is of a linear structure with a simple structure and convenient production and processing. Moreover, since a width of the first arc barrier groove 222 along the length direction of the movable contact piece 22 is relatively narrow, the overall structural strength of the movable contact piece 22 is relatively high.

[0120]As shown in FIG. 15, the first arc barrier groove 222 has a convex structure, so that the first arc barrier groove 222 has a broken-line groove structure, which increases the tortuosity of the transfer path of the arc root, thereby improving the arc extinguishing effect.

[0121]As shown in FIG. ...

third embodiment

[0125]This embodiment is similar to the first embodiment, with the only difference in the quantity and structure of the arc barrier portions.

[0126]As shown in FIGS. 20-21, the number of the arc barrier portions provided in this embodiment is one, and the portions of the movable contact piece 22, which are not provided with the arc barrier portions, are located at both sides along the length direction of the movable contact piece 22 and respectively in contact with the pair of stationary contact leading-out terminals 21.

[0127]Specifically, when the arc barrier portion is the first arc barrier groove 222, since one first arc barrier groove 222 is disposed between the pair of stationary contact leading-out terminals 21, and the width of the first arc barrier groove 222 along the length direction of the movable contact piece 22 is relatively wide, the portions of the movable contact piece 22, which are not provided with the first arc barrier groove 222 and disposed on both ends along th...

Claims

1. An arc barrier structure, comprising: a first arc barrier disposed outside a stationary contact leading-out terminal, a pair of stationary contact leading-out terminals being configured to contact with or separate from a movable contact piece; wherein a first step and / or a first gap is provided between the first arc barrier and the stationary contact leading-out terminal to impede arc transfer.

2. The arc barrier structure according to claim 1, wherein the first arc barrier is sleeved outside the stationary contact leading-out terminal.

3. The arc barrier structure according to claim 1, wherein a stationary contact is provided at a bottom of the stationary contact leading-out terminal, and an outer peripheral wall of the first arc barrier protrudes beyond an outer peripheral wall of the stationary contact, wherein the stationary contact leading-out terminal and the stationary contact are integrally or separately formed.

4. The arc barrier structure according to claim 1, wherein an outer peripheral wall of the first arc barrier protrudes beyond an outer peripheral wall of the stationary contact leading-out terminal, and the first step is formed between a bottom wall at one end of the first arc barrier facing the movable contact piece and an outer peripheral wall of a corresponding stationary contact leading-out terminal.

5. The arc barrier structure according to claim 1, wherein the first gap is provided between an inner wall at a bottom of one end of the first arc barrier facing the movable contact piece and an outer peripheral wall of the stationary contact leading-out terminal.

6. The arc barrier structure according to claim 1, wherein one end of the first gap facing the movable contact piece is provided with an open end and one end of the first gap away from the movable contact piece is provided with a closed end.

7. The arc barrier structure according to claim 1, wherein the first gap is provided between an inner peripheral wall at a bottom of the first arc barrier and an outer peripheral wall at a bottom of the stationary contact leading-out terminal.

8. The arc barrier structure according to claim 1, wherein one of an inner wall of the first arc barrier and an outer wall of the stationary contact leading-out terminal is provided with a positioning part, and the other of the inner wall of the first arc barrier and the outer wall of the stationary contact leading-out terminal is provided with a fitting part, and the positioning part is engaged with the fitting part.

9. The arc barrier structure according to claim 1, wherein the first arc barrier is made of an insulating material.

10. The arc barrier structure according to any one of claims 1 to 9, wherein a first guiding gap is provided between an inner wall at a top of one end of the first arc barrier away from the movable contact piece and an outer wall of the corresponding stationary contact leading-out terminal, and the first guiding gap is configured to guide the stationary contact leading-out terminal.

11. A contact unit, comprising a movable contact piece, a pair of stationary contact leading-out terminals, and the arc barrier structure according to any one of claims 1 to 10, wherein the movable contact piece is configured to contact with or separate from the pair of stationary contact leading-out terminals, the first arc barrier of the arc barrier structure is disposed outside the stationary contact leading-out terminal, and the arc barrier structure is configured to impede arc transfer.

12. The contact unit according to claim 11, wherein portions of the movable contact piece in contact with the pair of stationary contact leading-out terminals are two first contact parts, and the first step and / or the first gap is at least partially disposed between inner edges of the two first contact parts.

13. The contact unit according to claim 11, wherein one surface of the movable contact piece facing the stationary contact leading-out terminal is a top surface of the movable contact piece, an arc barrier portion is provided on the top surface of the movable contact piece, and the arc barrier portion is configured to impede movement of an arc toward a direction in which the pair of stationary contact leading-out terminals face each other.

14. The contact unit according to claim 13, wherein the arc barrier portion is a first arc barrier groove; and / or the arc barrier portion is an arc barrier rib.

15. The contact unit according to claim 13, wherein portions of the movable contact piece in contact with the pair of stationary contact leading-out terminals are two first contact parts, and the arc barrier portion is disposed between inner edges of the two first contact parts.

16. The contact unit according to any one of claims 11 to 15, further comprising an insulating cover, wherein the movable contact piece is movably disposed within the insulating cover, and the stationary contact leading-out terminal is inserted into the insulating cover and is at least partially disposed within the insulating cover.

17. The contact unit according to claim 16, wherein the first arc barrier is disposed outside a portion of the stationary contact leading-out terminal located inside the insulating cover.

18. A relay, comprising the contact unit according to any one of claims 11 to 17.

19. The relay according to claim 18, further comprising an anti-short circuit assembly, wherein the short-circuit resistance assembly is provided at least at a side of the movable contact piece facing the stationary contact leading-out terminal, and is configured to generate an attractive force upon occurrence of a high fault current in the movable contact piece to resist an electro-dynamic repulsive force between the movable contact piece and the stationary contact leading-out terminal.

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