Arc isolation structure, contact unit and relay

Abstract

The invention provides an arc isolation structure, a contact unit and a relay, and relates to the technical field of electric power. The arc-isolating structure comprises a first arc-isolating piece, the first arc-isolating piece is installed on a movable contact spring, the movable contact spring is used for being in contact with or separated from the leading-out ends of the pair of static contacts, and the first arc-isolating piece is used for blocking arc transfer. As the static contact leading-out end is separated from the movable contact spring, electric arc is easily generated, and the first arc isolating piece is arranged outside the movable contact spring and is closer to an arcing point, so that the transfer of the electric arc is better hindered.

Description

Technical Field

[0001] The present invention generally relates to the field of electric power technology, and in particular to an arc isolation structure, a contact unit and a relay. Background Art

[0002] A relay is an electronic control device used in automatic control circuits. The relay has a control system (also known as an input circuit) and a controlled system (also known as an output circuit). In fact, it is an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays the role of automatic regulation, safety protection, and circuit conversion in the circuit. As a type of relay, most of the existing high-voltage DC relays use a direct-acting structure with a moving reed, that is, they use the cooperation of two static contacts and a moving reed to connect and disconnect the load.

[0003] The principle of breaking load of high-voltage DC relay is to generate directional magnetic blowing magnetic field by setting permanent magnets. When the moving and static contacts separate and generate arc, the arc is rapidly elongated by the magnetic blowing magnetic field until the arc is disconnected. The disconnection of arc also achieves load breaking. Among them, the most stringent breaking is called "limit breaking". The load of limit breaking is several times the rated load. If the arc is not stable enough at the moving and static contacts, the arc will transfer on the surface of the moving and static contacts, which will cause the arc to fail to extinguish mainly along the magnetic blowing arc path, and finally lead to the inability to break the arc. The product will explode and burn due to overload and overheating.

[0004] In addition, in order to meet the requirements of short-circuit resistance, existing high-voltage DC relays usually have soft magnetic bodies, i.e., anti-short-circuit rings, near the internal moving and static contacts, so as to generate electromagnetic attraction to resist the electromotive repulsion when the short-circuit current passes through. However, since soft magnetic bodies will be magnetized near the current-carrying conductor, they will have an attractive effect on the arc.

[0005] Due to the setting of the soft magnetic body, i.e. the anti-short circuit ring, when the relay is in the limit breaking state, the arc is not only affected by the magnetic blown magnetic field, but also by the magnetized soft magnetic body, which leads to arc disorder and reduces the "limit breaking" capability of the high voltage DC relay. At the same time, it will also cause the short circuit ring to burn out, affecting the anti-short circuit effect. If an auxiliary contact is set above the short circuit ring, the arc will also burn out the auxiliary contact. Summary of the invention

[0006] The arc isolation structure, contact unit and relay provided by the present invention improve the reliability of arc breaking and have good safety.

[0007] According to a first aspect of the present invention, there is provided an arc isolation structure, comprising:

[0008] The first arc-isolating member is mounted on the moving spring piece, and the moving spring piece is used to contact or separate with a pair of static contact lead-out terminals.

[0009] In some embodiments, the first arc-isolating member is sleeved on the outside of the static contact lead-out end.

[0010] In some embodiments, a first step is provided between the first arc isolation member and the movable reed piece to hinder arc transfer; and / or a first gap is provided between the first arc isolation member and the movable reed piece to hinder arc transfer.

[0011] In some embodiments, the portion where the movable spring piece contacts the pair of static contact lead-out terminals is a first contact portion, and the first step and / or the first gap is arranged between inner edges of the first contact portion.

[0012] In some embodiments, the first arc-isolating member includes a column, and the top of the column toward the static contact lead-out terminal protrudes from the top surface of the movable spring piece toward the static contact lead-out terminal, so that the first step is formed between the top of the column and the top surface of the movable spring piece.

[0013] In some embodiments, the first gap is arranged along the axial direction of the column.

[0014] In some embodiments, an end of the first gap facing the static contact lead-out terminal is provided with an open end, and an end of the first gap facing away from the static contact lead-out terminal is a closed end.

[0015] In some embodiments, a mounting groove is provided on a side wall of the movable spring, the column is at least partially disposed in the mounting groove, and the first gap is disposed between the column and the mounting groove.

[0016] In some embodiments, the mounting groove includes a first mounting portion, the first mounting portion is arranged on a side of the movable spring piece facing the static contact lead-out end, the column passes through the first mounting portion, and the first gap is arranged between the column and the first mounting portion.

[0017] In some embodiments, the mounting groove further includes a fixing portion, the fixing portion is communicated with the first mounting portion, and the column is clamped to the fixing portion for fixing the first arc isolation member.

[0018] In some embodiments, the mounting groove also includes a second mounting portion, the second mounting portion is arranged on a side of the moving spring away from the static contact lead-out end, the second mounting portion is connected to the first mounting portion through the fixing portion, the column is passed through the second mounting portion and a first guide gap is provided between the outer wall of the column and the inner wall of the second mounting portion, and the first guide gap is used for guiding the column.

[0019] In some embodiments, the first arc isolation member further includes a limiting portion, which is disposed on a side of the column away from the movable spring sheet and can abut against the movable spring sheet for limiting the position of the column.

[0020] In some embodiments, the first arc isolation member further includes an arc isolation ring, and the arc isolation ring wraps around an end portion of the movable reed along the length direction of the movable reed and at least a portion of a side wall of the movable reed.

[0021] In some embodiments, the first arc isolation member further includes a connecting portion, which is disposed at the bottom of the end of the movable spring piece away from the static contact lead-out end and is respectively connected to two ends of the arc isolation ring, and the column is disposed at the connecting portion.

[0022] According to the second aspect of the present invention, a contact unit of an embodiment of the present invention includes a movable reed, a pair of static contact lead-out terminals and the above-mentioned arc isolation structure, wherein the movable reed is used to contact or separate from a pair of static contact lead-out terminals, and the arc isolation structure is arranged on the outside of the movable reed, and the arc isolation structure is used to hinder arc transfer.

[0023] In some embodiments, the side of the movable spring piece facing the static contact lead-out end is the top surface of the movable spring piece, and the top surface of the movable spring piece is provided with an arc isolation portion, which is used to hinder the movement of the arc toward the direction in which the pair of static contact lead-out ends approach each other.

[0024] In some embodiments, the arc isolation portion is a first arc isolation groove; and / or,

[0025] The arc isolation portion is an arc isolation rib.

[0026] In some embodiments, the portion where the movable spring piece contacts the pair of static contact lead-out terminals is a first contact portion, and the arc-isolating portion is disposed between inner edges of the first contact portion.

[0027] In some embodiments, an anti-short circuit component is further included, which is arranged at least on one side of the movable spring piece facing the static contact lead-out terminal, and generates suction force when a large fault current occurs in the movable spring piece, so as to resist the electric repulsion between the movable spring piece and the static contact lead-out terminal.

[0028] According to a third aspect of the present invention, a relay according to an embodiment of the present invention includes the above-mentioned contact unit.

[0029] An embodiment of the present invention has the following advantages or beneficial effects:

[0030] The arc isolation structure provided by the embodiment of the present invention is easy to generate an arc due to the separation between the static contact lead-out end and the moving reed piece. The first arc isolation member is installed on the moving reed piece, which is closer to the arc starting point and better blocks the transfer of the arc.

[0031] An embodiment of the present invention provides a contact unit and a relay, wherein an arc isolation structure is arranged outside a movable reed, and the arc isolation structure can hinder arc transfer, thereby reducing the risk of arc ablation on the movable reed and achieving protection for the movable reed. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to better understand the present invention, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present invention. In addition, related elements or components may have different settings as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each of the drawings. The above and other features and advantages of the present invention will become more apparent by describing in detail its exemplary embodiments with reference to the drawings.

[0033] in:

[0034] Figure 1 The structure of the relay provided by the first embodiment of the present invention is shown in FIG. Figure 1 ;

[0035] Figure 2 It is shown that Figure 1 Sectional view at AA;

[0036] Figure 3 The figure shows the explosion of the relay provided in the first embodiment of the present invention. Figure 1 ;

[0037] Figure 4 The figure shows the cooperation between the moving spring and the first arc-isolating member in the relay provided by the first embodiment of the present invention. Figure 1 ;

[0038] Figure 5 The figure shows the cooperation between the moving spring and the first arc-isolating member in the relay provided by the first embodiment of the present invention. Figure 2 ;

[0039] Figure 6 It is shown that Figure 5 A cross-sectional view at B1-B1;

[0040] Figure 7 It is shown that Figure 5 A partial enlarged view at B2;

[0041] Figure 8The figure shows the cooperation between the moving spring and the first arc-isolating member in the relay provided by the first embodiment of the present invention. Figure 3 ;

[0042] Fig. 9 It is shown that Figure 8 A cross-sectional view at B3-B3;

[0043] Fig.10 It is shown that Figure 8 A partial enlarged view at B4;

[0044] Fig.11 The figure shows the explosion of the relay provided in the first embodiment of the present invention. Figure 2 ;

[0045] Fig.12 The figure shows the structure of the moving spring in the relay provided by the first embodiment of the present invention. Figure 1 ;

[0046] Fig.13 The figure shows the structure of the moving spring in the relay provided by the first embodiment of the present invention. Figure 2 ;

[0047] Fig.14 The structure of the relay provided by the first embodiment of the present invention is shown in FIG. Figure 2 ;

[0048] Fig.15 The diagram shows a schematic diagram of the structure of a contact container in a relay provided in the first embodiment of the present invention;

[0049] Fig.16 The figure shows a schematic diagram of the structure of a push rod unit in a relay provided in the first embodiment of the present invention;

[0050] Fig.17 The figure shows the structure of the moving spring in the relay provided by the second embodiment of the present invention. Figure 1 ;

[0051] Fig.18 The figure shows the structure of the moving spring in the relay provided by the second embodiment of the present invention. Figure 2 ;

[0052] Fig.19 The figure shows the structure of the moving spring in the relay provided by the second embodiment of the present invention. Figure 3 ;

[0053] Fig. 20 The figure shows the structure of the moving spring in the relay provided by the second embodiment of the present invention. Figure 4 ;

[0054] Fig.21The figure shows the structure of the moving spring in the relay provided by the second embodiment of the present invention. Figure 5 ;

[0055] Fig. 22 The figure shows the structure of the moving spring in the relay provided by the second embodiment of the present invention. Figure 6 ;

[0056] Fig.23 The figure shows the structure of the moving spring in the relay provided by the third embodiment of the present invention. Figure 1 ;

[0057] Fig.24 The figure shows the structure of the moving spring in the relay provided by the third embodiment of the present invention. Figure 2 .

[0058] The reference numerals are described as follows:

[0059] 1. Contact container; 2. Contact assembly; 3. Anti-short circuit assembly; 4. Push assembly; 5. Arc extinguishing unit; 7. First arc isolating member;

[0060] 11. Insulation cover; 12. Frame piece;

[0061] 21. static contact lead-out terminal; 22. moving spring; 220. first contact portion; 221. thrust portion; 2211. through hole; 222. first arc-isolating groove; 223. mounting groove; 2231. first mounting portion; 2232. fixing portion; 2233. second mounting portion; 225. arc-isolating rib;

[0062] 31. Upper magnetic conductor; 32. Lower magnetic conductor;

[0063] 41. push rod unit; 411. push rod; 412. limit protrusion; 413. base;

[0064] 42. U-shaped bracket; 421. limiting hole;

[0065] 43. Elastic parts;

[0066] 44, electromagnet unit; 441, coil frame; 442, coil; 443, moving iron core; 444, static iron core; 445, U-shaped yoke; 446, magnetic tube; 447, spring;

[0067] 51. Arc extinguishing magnet; 52. Yoke iron clamp;

[0068] 70. column; 71. first step; 72. first gap; 73. first guide gap; 74. limit portion; 75. arc isolation ring; 76. connecting portion. DETAILED DESCRIPTION

[0069] The following will be combined with the accompanying drawings in the exemplary embodiments of the present invention to clearly and completely describe the technical solutions in the exemplary embodiments of the present invention. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present invention.

[0070] In the description of the present invention, unless otherwise clearly specified and limited, the terms "second" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0071] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can 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 invention can be understood according to specific circumstances.

[0072] Further, in the description of the present invention, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present invention are described at the angles shown in the accompanying drawings and should not be understood as limiting the exemplary embodiments of the present invention. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to another element (one or more) "upper", "lower", or "inner", "outer", it can not only be directly connected to the other (one or more) elements "upper", "lower", "inner", "outer", but also can be indirectly connected to the other (one or more) elements "upper", "lower", "inner", "outer" through an intermediate element.

[0073] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0074] Embodiment 1

[0075] This embodiment provides a contact unit such as Figure 1-Figure 2As shown, the contact unit includes a contact assembly 2, and the contact assembly 2 includes a movable spring 22 and a pair of stationary contact lead-out terminals 21. The movable spring 22 is used to contact or separate with the pair of stationary contact lead-out terminals 21.

[0076] In the contact unit provided in this embodiment, the movable spring 22 contacts or separates from a pair of static contact lead-out terminals 21. When the movable spring 22 contacts the static contacts at the bottom of the pair of static contact lead-out terminals 21, current flows into one static contact lead-out terminal 21 and flows out from the other static contact lead-out terminal 21 after passing through the movable spring 22, thereby connecting the load.

[0077] When the moving reed 22 and the static contacts at the bottom of a pair of static contact lead-out terminals 21 are separated, as the moving and static contacts between the moving reed 22 and the static contact lead-out terminals 21 are separated and the arc is drawn by magnetic blowing, if the arc is elongated to a certain extent, the arc will automatically break; if the arc is not stable enough at the moving and static contacts, the arc will transfer on the surface of the moving reed 22 or the static contact lead-out terminals 21, which will cause the arc to be unable to extinguish mainly along the magnetic blowing arc path, and finally cause the arc to be unable to be disconnected, and even the relay will explode and burn.

[0078] To solve this problem, Figure 2-Figure 5 As shown, the contact unit provided in this embodiment further includes an arc isolation structure, which is arranged outside the movable spring piece 22 and is used to prevent arc transfer.

[0079] In the contact unit provided in the present embodiment, an arc isolation structure is provided outside the movable reed 22 , and the arc isolation structure can hinder arc transfer, thereby reducing the risk of arc ablation on the movable reed 22 , thereby protecting the movable reed 22 .

[0080] Specifically, Figure 4-Figure 10 As shown, the arc isolation structure provided in this embodiment includes a first arc isolation member 7, which is installed on the movable spring piece 22, and is used to prevent arc transfer.

[0081] The arc isolation structure provided in this embodiment is easy to generate an arc due to the separation between the static contact lead-out terminal 21 and the moving spring piece 22. Therefore, the first arc isolation member 7 is installed on the moving spring piece 22. The first arc isolation member 7 is closer to the arc starting point, which better hinders the transfer of the arc.

[0082] A first step 71 is provided between the first arc-isolating member 7 and the movable spring piece 22 to prevent arc transfer; and / or a first gap 72 is provided between the first arc-isolating member 7 and the movable spring piece 22 to prevent arc transfer.

[0083] The arc isolation structure provided in this embodiment is provided with a first step 71 and / or a first gap 72 at the contact position between the first arc isolation member 7 and the moving spring piece 22 and on the path where the arc moves, that is, a bend is formed on the arc path, which can consume the kinetic energy of the arc and better block the transfer of the arc. The arc transfer direction has two directions: first, the first step 71 and / or the first gap 72 can block the arc from transferring along the moving spring piece 22 to the direction where the pair of static contact lead-out terminals 21 are close to each other, thereby avoiding the situation where the two sets of moving and static contacts between the moving spring piece 22 and the pair of static contact lead-out terminals 21 produce an arc short circuit; second, the first step 71 and / or the first gap 72 can block the arc from transferring downward along the moving spring piece 22 to the direction away from the static contact lead-out terminals 21, further reducing the arc ablation on the outer wall of the moving spring piece 22, improving the arc extinguishing ability and effect, and thus improving the load breaking ability between the moving contact and the static contact corresponding to the moving spring piece 22 and the static contact lead-out terminals 21.

[0084] In one embodiment, the first arc isolation member 7 is made of insulating material.

[0085] Specifically, the first arc-isolating member 7 can be made of insulating materials such as ceramics, glass, rubber or plastic. The first arc-isolating member 7 made of insulating materials has good arc-breaking or arc-cooling performance, strong arc-extinguishing ability and good arc-extinguishing effect.

[0086] It can be understood that in some other embodiments, the first arc isolation member 7 can also be made of metal material.

[0087] In one embodiment, the first arc isolation member 7 is sleeved on the outer wall of the movable spring piece 22 .

[0088] The first arc-isolating member 7 can also be called an arc-isolating sleeve. The first arc-isolating member 7 is sleeved on the outer wall of the moving spring piece 22 to perform arc-isolating treatment on the outer peripheral side of the contact area corresponding to the moving contact of the moving spring piece 22, which can isolate the arc more comprehensively and is conducive to arc extinguishing.

[0089] It can be understood that the number of the first arc-isolating members 7 is two, and the two first arc-isolating members 7 are respectively arranged at two ends of the movable spring piece 22 along the length direction of the movable spring piece 22 .

[0090] In this way, the two groups of moving and static contacts between the moving spring piece 22 and the static contact lead-out terminal 21 correspond to the two first arc-isolating members 7 respectively, so that each group of moving and static contacts can be arc-isolated by a corresponding first arc-isolating member 7, and double arc extinguishing can be achieved, thereby improving the thoroughness of arc extinguishing.

[0091] In one embodiment, Figure 4-Figure 10As shown, the first arc-isolating member 7 includes a column 70, the top surface of the column 70 facing the static contact lead-out terminal 21 protrudes from the top surface of the moving spring piece 22 facing the static contact lead-out terminal 21, so that a first step 71 is formed between the top surface of the column 70 and the top surface of the moving spring piece 22.

[0092] Since the top surface of the column 70 in the first arc-isolating member 7 protrudes from the top surface of the moving spring piece 22, the top of the column 70 and the top surface of the moving spring piece 22 are not coplanar, or the column 70 is not embedded in the top surface of the moving spring piece 22, and a first step 71 is formed between the top of the column 70 and the top surface of the moving spring piece 22. The first step 71 is closer to the arc starting point, thereby isolating and cutting off the transfer path of the arc on the top surface of the moving spring piece 22, and preventing the arc from transferring to the center line of the length direction of the moving spring piece 22, avoiding the arc short circuit generated by the two sets of moving and static contacts between the moving spring piece 22 and a pair of static contact lead-out terminals 21, so that the arc can be efficiently extinguished on the originally set arc extinguishing path of the magnetic blowing magnetic field, thereby improving the arc extinguishing ability.

[0093] In one embodiment, Figure 4-Figure 10 As shown, the side wall of the movable spring 22 is provided with a mounting groove 223, the column 70 is at least partially disposed in 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 the axial direction of the column 70.

[0094] A mounting groove 223 is provided on the side wall of the movable spring piece 22. The mounting groove 223 not only provides a holding space for the column 70, but also serves to install the column 70. The outer wall of the column 70 and the inner wall of the mounting groove 223 are not in contact with each other. A first gap 72 is provided 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 a holding space for the arc and reduces the risk of this part of the arc transferring along the movable spring piece 22 in a direction away from the static contact lead-out terminal 21, thereby improving the arc extinguishing effect.

[0095] In one embodiment, an end of the first gap 72 facing the static contact lead-out terminal 21 is provided with an open end, and an end of the first gap 72 facing away from the static contact lead-out terminal 21 is a closed end.

[0096] The open end of the first gap 72 is used to introduce the arc, and the first gap 72 has a closed end so that the first gap 72 does not completely penetrate the structure, thereby forming a bend in the arc path.

[0097] In one embodiment, Figure 4-Figure 10As shown, the mounting groove 223 includes a first mounting portion 2231 , which is disposed on the side of the movable spring piece 22 facing the static contact lead-out end 21 , the column 70 passes through the first mounting portion 2231 , and the first gap 72 is disposed between the column 70 and the first mounting portion 2231 .

[0098] A first mounting portion 2231 is provided on the side wall of the movable spring piece 22 and facing the side of the static contact lead-out terminal 21, that is, the first mounting portion 2231 is located at the upper part of the side wall of the movable spring piece 22, and a first gap 72 is provided between the first mounting portion 2231 and the column 70. Since the first gap 72 is closer to the position where the movable spring piece 22 and the static contact lead-out terminal 21 contact each other, a part of the arc can directly enter the first gap 72.

[0099] In addition, the 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 a concentrated arc. At the same time, due to the existence of the first gap 72, a part of the arc can enter the first gap 72 to form a height difference in the arc transfer path. This height difference makes it difficult for the arc to move away from the static contact lead-out terminal 21. The combination of the edge and the height difference is used to improve the arc extinguishing effect.

[0100] In one embodiment, the first gap 72 is a trumpet-shaped structure, and the wide end of the first gap 72 is arranged toward the static contact lead-out terminal 21 .

[0101] In one embodiment, Figure 4-Figure 10 As shown, the mounting groove 223 further includes a fixing portion 2232 , the fixing portion 2232 is communicated with the first mounting portion 2231 , and the column 70 is clamped on the fixing portion 2232 for fixing the first arc isolation member 7 .

[0102] Specifically, the column 70 is clamped on the fixing portion 2232, that is, the outer wall of the column 70 and the inner wall of the fixing portion 2232 are in contact or interference fit, and the fixing portion 2232 clamps and fixes the column 70 to prevent the first arc isolation member 7 from detaching from the movable spring leaf 22.

[0103] In one embodiment, Figure 4-Figure 10 As shown, the mounting groove 223 also includes a second mounting portion 2233, and the second mounting portion 2233 is arranged on the side of the moving spring piece 22 away from the static contact lead-out end 21, and the second mounting portion 2233 is connected to the first mounting portion 2231 through the fixing portion 2232, and the column 70 is penetrated through the second mounting portion 2233 and a first guide gap 73 is arranged between the outer wall of the column 70 and the inner wall of the second mounting portion 2233, and the first guide gap 73 is used for guiding the column 70.

[0104] The second mounting portion 2233 is arranged on the side of the moving spring piece 22 away from the static contact lead-out terminal 21, that is, the second mounting portion 2233 is located at the lower part of the side wall of the moving spring piece 22, and a first guide gap 73 is arranged between the first mounting portion 2231 and the column 70, and the first guide gap 73 is used to guide the column 70. Since the column 70 needs to be inserted from the bottom of the moving spring piece 22 into the mounting groove 223 of the moving spring piece 22 when the first arc-isolating member 7 is installed on the moving spring piece 22, for this purpose, a first guide gap 73 is arranged 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 in contact with each other, and the first guide gap 73 is used to provide a guiding effect for the column 70, so as to facilitate the installation of the column 70 of the first arc-isolating member 7.

[0105] It can be understood that the first guide gap 73 can be a trumpet-shaped structure, and the large end of the first guide gap 73 is set away from the static contact lead-out terminal 21. The large end of the first gap 72 provides an entrance for the column 70 to pass through, further improving the convenience of installing the first arc-isolating member 7.

[0106] In one embodiment, Figure 4-Figure 10 As shown, there are two columns 70 , and two mounting grooves 223 are disposed on both sides of the movable spring piece 22 along the width direction of the movable spring piece 22 and between the inner edges of the first contact portion 220 . The two columns 70 are disposed correspondingly to the two mounting grooves 223 .

[0107] Specifically, the two columns 70 are correspondingly arranged along the width direction of the movable spring piece 22. The two columns 70 can completely cut off the transfer path of the arc toward the pair of static contact lead-out terminals 21 approaching each other, and the arc isolation effect is good.

[0108] In one embodiment, Figure 4-Figure 10 As shown, the first arc isolation member 7 further includes a limiting portion 74 , which is disposed on a side of the column 70 away from the movable spring piece 22 and can abut against the movable spring piece 22 for limiting the position of the column 70 .

[0109] When the first arc isolation member 7 is installed on the movable spring piece 22 , the limiting portion 74 can abut against the movable spring piece 22 to initially position and limit the column 70 of the first arc isolation member 7 , thereby improving the accuracy of the installation of the first arc isolation member 7 .

[0110] In one embodiment, Figure 4-Figure 10 As shown, the first arc-isolating member 7 further includes an arc-isolating ring 75 , which wraps around at least a portion of the side wall of the end portion of the movable spring piece 22 along the length direction of the movable spring piece 22 .

[0111] The arc-isolating ring 75 of the first arc-isolating member 7 is wrapped around the end of the moving spring piece 22 and at least part of the side wall of the moving spring piece 22, which is equivalent to installing an arc-isolating sleeve on the outer peripheral side of the contact area between the static contact lead-out end 21 and the moving spring piece 22, reducing the arc ablation of the outer wall of the moving spring piece 22, and preventing the arc from transferring downward along the side wall of the moving spring piece 22, which is conducive to arc extinguishing. In addition, the arc-isolating ring 75 is a hollow structure, that is, a center hole is provided in the center of the arc-isolating ring 75, and the arc-isolating ring 75 plays a role in reducing weight, meeting the demand for lightweight.

[0112] In one embodiment, Figure 4-Figure 10 As shown, the first arc-isolating member 7 further includes a connecting portion 76 , which is disposed at the bottom of the movable spring piece 22 away from the static contact lead-out terminal 21 and is respectively connected to the two ends of the arc-isolating ring 75 , and the column 70 is disposed at the connecting portion 76 .

[0113] If the arc isolation ring 75 has an open end, the arc isolation ring 75 is an open structure, and the connecting parts 76 are respectively connected to the two ends of the arc isolation ring 75, so that the first arc isolation member 7 is an integral structure, and the fixing effect between the first arc isolation member 7 and the movable spring piece 22 is improved. At the same time, the connecting part 76 is located at the bottom of the movable spring piece 22, and will not interfere with the mutual contact between the movable spring piece 22 and the static contact lead-out terminal 21.

[0114] It should be noted that the relay contact assembly 2 provided in this embodiment can have the first arc-isolating member 7, the first step 71 and the first gap 72 at the same time. The first step 71 and the first gap 72 form a partial arc-isolating structure for limiting the partial arc or the arc from being transferred along the moving spring piece 22 in a direction away from the static contact lead-out terminal 21 and limiting the partial arc from being transferred along the moving spring piece 22 in a direction where the pair of static contact lead-out terminals 21 are close to each other. The first arc-isolating member 7 made of insulating material has the performance of breaking the arc or cooling the arc to achieve the effect of extinguishing the arc.

[0115] It should be particularly noted that, in some other embodiments, a second arc-isolating member may be further provided outside the static contact lead-out terminal 21 to hinder arc transfer and play a role in protecting the static contact lead-out terminal 21 .

[0116] In one embodiment, Fig.11 As shown, the contact unit provided in this embodiment also includes a contact container 1, which includes an insulating cover 11, a movable spring 22 is movably arranged in the insulating cover 11, and a static contact lead-out terminal 21 is passed through the insulating cover 11 and is at least partially arranged in the insulating cover 11.

[0117] The insulating cover 11 and the yoke iron plate are connected by a frame sheet 12, and the insulating cover 11 and the yoke iron plate enclose a contact chamber. The contact chamber provides an arc-isolating environment for the contact between the moving spring piece 22 and the static contact lead-out terminal 21, ensuring the reliability of the relay during use.

[0118] In one embodiment, Fig.12 As shown, the portion where the movable spring piece 22 and the pair of static contact lead-out terminals 21 contact each other is the first contact portion 220 , and the first step 71 and / or the first gap 72 are arranged between the inner edges of the first contact portion 220 .

[0119] Specifically, the first contact portion 220 is specifically two groups of moving and static contacts. Since an arc is generated at the contact portion between the moving spring piece 22 and a pair of static contact lead ends 21, the first step 71 and / or the first gap 72 are arranged between the inner edges of the first contact portion 220. The first step 71 and / or the first gap 72 can cut off the path of the arc transferring to the side, thereby avoiding the situation where the two groups of moving and static contacts generate an arc short circuit.

[0120] In one embodiment, Fig.12 and Fig.13 As shown, the movable spring piece 22 provided in this embodiment has a side of the movable spring piece 22 facing the static contact lead-out terminal 21 as the top surface of the movable spring piece 22, and an arc-isolating portion is provided on the top surface of the movable spring piece 22, which is used to prevent the arc from moving in a direction in which a pair of static contact lead-out terminals 21 approach each other.

[0121] The arc isolation portion is arranged on the top surface of the moving reed piece 22 to prevent the arc from transferring along the top surface of the moving reed piece 22, thereby isolating and cutting off the transfer path of the arc on the top surface of the moving reed piece 22, and preventing the arc from transferring to the center line of the length direction of the moving reed piece 22, thereby avoiding the arc short circuit generated by the two groups of moving and static contacts between the moving reed piece 22 and a pair of static contact lead-out terminals 21, so that the arc can be efficiently extinguished on the originally set arc extinguishing path of the magnetic blowing magnetic field, thereby improving the arc extinguishing ability.

[0122] In one embodiment, Fig.12 and Fig.13 As shown, the arc-isolating portion is disposed between the inner edges of the two first contact portions 220 .

[0123] Among them, the part where the movable spring piece 22 and the pair of static contact lead-out terminals 21 contact each other is the first contact portion 220, and the arc isolation portion is arranged between the inner edges of the first contact portion 220 to cut off the path of the arc transferring to the inner side of the static contact lead-out terminals 21, avoiding the arc short circuit generated by the two groups of movable and static contacts between the movable spring piece 22 and the pair of static contact lead-out terminals 21, so as to ensure the high efficiency and thoroughness of arc extinguishing.

[0124] It should be noted that the inner side specifically refers to the side where a pair of static contact lead-out terminals 21 are close to each other (such as Figure 2 Q is the direction in which a pair of static contact lead-out terminals 21 approach each other, and M is the center line of the static contact lead-out terminals 21), or one side close to the center line of the length direction of the dynamic spring piece 22 (such as Fig.12L is the length direction of the movable spring piece 22, and T is the width direction of the movable spring piece 22). Therefore, the arc-isolating portion is disposed on the inner side of the first contact portion 220.

[0125] In one embodiment, there are two arc isolation parts, which are arranged corresponding to a pair of static contact lead-out terminals 21 , and the distance between the outer edges of the two arc isolation parts along the length direction of the movable spring piece 22 is less than or equal to the distance between the inner edges of the first contact part 220 .

[0126] Specifically, since there are two static contact lead-out terminals 21, two arc-isolating portions are arranged corresponding to the two static contact lead-out terminals 21 and are arranged on the inner side of the static contact lead-out terminals 21, so that the arc generated by the separation of the two groups of moving and static contacts is isolated by the two arc-isolating portions respectively, which plays a double arc-isolating role and further improves the arc-isolating effect.

[0127] In one embodiment, Figure 12-13 As shown, the arc-isolating portion is a first arc-isolating groove 222 ; and / or, the arc-isolating portion is an arc-isolating rib 225 .

[0128] When the first arc-isolating portion is the first arc-isolating groove 222, that is, a concave structure is provided on the top surface of the moving spring piece 22; when the first arc-isolating portion is the arc-isolating rib 225, that is, a convex structure is provided on the top surface of the moving spring piece 22, these two structures can solve the problem of rapid arc transfer on the top surface of the planar structure moving spring piece 22. The first arc-isolating groove 222 and / or the arc-isolating rib 225 can be used to isolate and cut off the transfer path of the arc on the top surface of the moving spring piece 22, and prevent the arc from transferring to the center line of the length direction of the moving spring piece 22, thereby avoiding arc short circuits generated by two sets of moving and static contacts between the moving spring piece 22 and a pair of static contact lead-out terminals 21.

[0129] Specifically, the first arc isolation groove 222 includes a first groove wall and a first groove bottom connected to each other. The arc moves to the connection between the first groove wall and the top surface of the movable spring piece 22 to form a concentrated arc, and the height difference between the top surface of the movable spring piece 22 facing the static contact lead-out terminal 21 and the first groove bottom is used to prevent the arc from moving in the direction of the pair of static contact lead-out terminals 21 approaching each other.

[0130] Since the first arc isolation groove 222 has a first groove wall and a first groove bottom that are connected to each other, the connection between the first groove wall and the top surface of the movable spring piece 22 is an edge, and the arc moves to the edge to form a concentrated arc. At the same time, the height difference between the top surface of the movable spring piece 22 and the first groove bottom forms a drop on the arc transfer path. This drop makes it difficult for the arc to move toward the center line of the length direction of the movable spring piece 22. The combination of the edge and the drop is used to improve the arc extinguishing effect.

[0131] In one embodiment, Figure 7 As shown, the first arc isolation groove 222 is a through groove along the width direction of the movable spring piece 22 .

[0132] If the first arc isolating groove 222 extends along the length direction of the moving spring piece 22, the arc may transfer along the portion of the top surface of the moving spring piece 22 where the first arc isolating groove 222 is not provided, which may cause the risk of arc short circuit. To this end, the first arc isolating groove 222 is provided as a through groove along the width direction of the moving spring piece 22. Since the through groove is provided in the width direction of the moving spring piece 22, after the arc enters the first arc isolating groove 222, the transfer path of the arc toward the direction of the pair of static contact lead-out terminals 21 approaching each other is completely cut off.

[0133] In one embodiment, the first arc isolation groove 222 is an arc-shaped structure, and the first arc isolation groove 222 is arranged around the static contact lead-out terminal 21 .

[0134] Specifically, since the bottom of the static contact lead-out terminal 21 is similar to a cylindrical structure, the shape of the first arc-isolating groove 222 is adapted to the outer shape of the bottom of the static contact lead-out terminal 21. The first arc-isolating groove 222 with an arc-shaped structure is arranged along the outer shape of the static contact lead-out terminal 21 and is arranged around the static contact lead-out terminal 21, thereby obstructing the transfer path of the arc in all directions.

[0135] It can be understood that the first arc-isolating groove 222 of the arc-shaped structure extends from one side of the movable spring piece 22 to the other side in the width direction, and a contact portion is formed at both ends of the movable spring piece 22 along the length direction of the movable spring piece 22 and in the part where the first arc-isolating groove 22 is not provided, and the contact portion is used to contact with the static contact lead-out terminal 21.

[0136] It should be particularly noted that the first arc isolation groove 222 can be replaced by the arc isolation rib 225. The location and shape of the arc isolation rib 225 are similar to those of the first arc isolation groove 222 and will not be described in detail.

[0137] This embodiment further provides a relay, comprising the above-mentioned contact unit.

[0138] In the relay provided in this embodiment, the movable reed 22 of the contact unit contacts or separates from a pair of stationary contact lead-out terminals 21. When the movable reed 22 contacts the stationary contacts at the bottom of the pair of stationary contact lead-out terminals 21, current flows into one stationary contact lead-out terminal 21, passes through the movable reed 22, and then flows out from the other stationary contact lead-out terminal 21, thereby connecting the load.

[0139] In one embodiment, Figure 14-16As shown, the relay also includes a push assembly 4, which includes a push rod unit 41, an elastic member 43 and a U-shaped bracket 42. Among them, the push rod unit 41 includes a base 413 and a push rod 411, and the upper parts of the base 413 and the push rod 411 can be integrally injection molded. The U-shaped bracket 42 and the base 413 form a frame structure, and the moving spring 22 and the elastic member 43 are installed in the frame structure formed 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 abuts against the moving spring 22. The elastic member 43 can provide elastic force, so that the moving spring 22 has a tendency to move away from the base 413 and close to the static contact lead-out terminal 21.

[0140] Specifically, the push rod unit 41 and the U-shaped bracket 42 cooperate with each other through the limiting protrusion 412 and the limiting hole 421, and the moving force of the push rod unit 41 can be transmitted to the U-shaped bracket 42 to drive the moving spring 22 to move, so that the moving spring 22 can be used to contact or separate with a pair of static contact lead-out terminals 21.

[0141] The driving assembly 4 of the relay also includes an electromagnet unit 44 (such as Figure 2-Figure 3 As shown in FIG. 1 , the electromagnet unit 44 is arranged on the side of the yoke plate away from the insulating cover 11. The push rod unit 41 is drivingly connected to the electromagnet unit 44. The push rod unit 41 is movably arranged in the driving chamber surrounded by the metal cover and the yoke plate and passes through the through hole of the yoke plate to abut against the moving spring 22. When the electromagnet unit 44 is energized, it can drive the push rod unit 41 to move, thereby driving the moving spring 22 to move, so as to contact or separate from the static contact lead-out terminal 21.

[0142] The electromagnet unit 44 includes a coil frame 441, a coil 442, a static iron core 444, a moving iron core 443, a U-shaped yoke 445, a magnetic cylinder 446 and a spring 447. The coil frame 441 is arranged in the U-shaped yoke 445, and the coil frame 441 is in a hollow cylindrical shape and is formed of an insulating material. The magnetic cylinder 446 is inserted into the coil frame 441, and the coil 442 surrounds the coil frame 441. The static iron core 444 has a second through hole, and the second through hole is arranged corresponding to the through hole of the yoke plate, so that the push rod unit 41 can be inserted therein. The moving iron core 443 is movably arranged in the magnetic cylinder 446 and is arranged opposite to the static iron core 444. The spring 447 is arranged between the static iron core 444 and the moving iron core 443 and can be respectively abutted therewith. The moving iron core 443 is connected to the push rod unit 41, and is used to be attracted by the static iron core 444 when the coil 442 is energized. The moving iron core 443 and the push rod unit 41 can be connected by screwing, riveting, welding or other methods.

[0143] The working process of the relay provided in this embodiment is as follows:

[0144] When the coil 442 is energized, the static iron core 444 attracts the moving iron core 443, and the moving iron core 443 drives the push rod unit 41 to move upward, and the spring 447 between the static iron core 444 and the moving iron core 443 is compressed. The push rod unit 41 pushes the moving reed 22 to move through the U-shaped bracket 42 and the elastic member 43, so that the two ends of the moving reed 22 are respectively in contact with the two static contact lead-out ends 21 to complete the process of closing the moving and static contacts.

[0145] When the coil 442 disconnects the current, the static iron core 444 releases its attraction to the moving iron core 443. Under the elastic force of the compressed spring 447, the moving iron core 443 drives the push rod unit 41 to move downward, so that the moving contacts at both ends of the moving spring 22 are separated from the two static contact lead-out ends 21, thereby completing the process of separation of the moving and static contacts.

[0146] When the short-circuit load is very large, under the action of the short-circuit current, an electrostatic repulsion force will be generated between the moving spring piece 22 and the static contact lead-out terminal 21, causing the contacts to bounce open, resulting in arcing and violent burning of the contacts, and even possible explosion.

[0147] To this end, the relay provided in this embodiment also includes an anti-short circuit component 3 (such as Figure 2-Figure 3 As shown), the anti-short-circuit component 3 is arranged on at least the upper side of the moving reed 22 along the axial direction of the static contact lead-out terminal 21, and generates suction when a large fault current occurs in the moving reed 22, so as to resist the electric repulsion between the moving reed 22 and the static contact lead-out terminal 21.

[0148] Among them, the anti-short-circuit component 3 can also be called a short-circuit ring arranged between a pair of static contact lead-out terminals 21. For the high-voltage DC relay, the first arc-isolating member 7 can prevent the arc from being attracted by the anti-short-circuit component 3 and causing the arc to be attracted in the direction of a pair of static contact lead-out terminals 21 approaching each other, thereby preventing the insulation between the contacts from decreasing or the arc short-circuiting.

[0149] Specifically, the thrust portion 221 of the moving reed 22 is arranged between the two contact portions, and the anti-short circuit component 3 is arranged on the thrust portion 221 of the moving reed 22. The two sides of the thrust portion 221 are planar structures. The double-sided planes of the thrust portion 221 provide installation convenience and reliability for the anti-short circuit component 3. The anti-short circuit component 3 is used to resist the electric repulsion between the moving reed 22 and the static contact lead-out terminal 21.

[0150] In one embodiment, the anti-short circuit assembly 3 includes an upper magnetic conductor 31 and a lower magnetic conductor 32, wherein the upper magnetic conductor 31 is disposed on a side of the moving spring 22 close to the static contact lead-out terminal 21. The lower magnetic conductor 32 is at least partially disposed on a side of the moving spring 22 away from the static contact lead-out terminal 21, so as to form a magnetic conductive loop between the upper magnetic conductor 31 and the lower magnetic conductor 32. The upper magnetic conductor 31 and the lower magnetic conductor 32 can be made of materials such as iron, cobalt, nickel and alloys thereof.

[0151] The upper magnet 31 is arranged on the side of the thrust portion 221 close to the static contact lead-out end 21, and the lower magnet 32 ​​is arranged on the side of the thrust portion 221 away from the static contact lead-out end 21, that is, the lower magnet 32 ​​is fixed below the thrust portion 221 of the movable spring piece 22, and a magnetic circuit can be formed between the upper magnet 31 and the lower magnet 32, and the lower magnet 32 ​​can move together with the movable spring piece 22 toward the direction close to the static contact lead-out end 21. When a large fault current occurs in the movable spring piece 22, since the upper magnetic conductor 31 is located above the movable spring piece 22 and the lower magnetic conductor 32 is located below the movable spring piece 22, it is equivalent to that the movable spring piece 22 is sandwiched between the upper magnetic conductor 31 and the lower magnetic conductor 32. When the upper magnetic conductor 31 generates suction force on the lower magnetic conductor 32, the suction force attracts and pulls the movable spring piece 22, and is used to resist the electromotive repulsion generated by the fault current between the movable spring piece 22 and the static contact lead-out terminal 21, thereby avoiding the situation where the movable spring piece 22 and the static contact lead-out terminal 21 are separated from each other and cause arcing explosion, thereby ensuring the reliability and safety of the contact between the movable spring piece 22 and the static contact lead-out terminal 21.

[0152] In one embodiment, the upper magnet 31 may be a straight-line structure, and the upper magnet 31 is correspondingly arranged between the two contact portions of the movable spring piece 22, and the upper magnet 31 may extend along the width direction of the movable spring piece 22, for matching and corresponding the upper magnet 31 and the lower magnet 32. The lower magnet 32 ​​is a U-shaped structure, and the opening of the lower magnet 32 ​​is arranged toward the movable spring piece 22, so that the two side arms of the lower magnet 32 ​​extend toward the direction of the upper magnet 31, so that the two side arms of the lower magnet 32 ​​can be close to or contact the two ends of the upper magnet 31, respectively, to form a surrounding magnetic conductive ring on the movable spring piece 22 along its width. Since the contact parts at both ends of the moving reed 22 along its length direction are moving contacts, the surrounding magnetic conductive ring formed along the width direction of the moving reed 22 will not interfere. When a large fault current occurs in the moving reed 22, an electromagnetic attraction force is generated in the pressure direction of the moving contact to resist the electric repulsion force generated by the fault current between the moving reed 22 and the static contact lead-out terminal 21.

[0153] It should be particularly noted that the U-shaped bracket 42 can be fixedly connected to the upper magnetic conductor 31, the lower magnetic conductor 32 is connected to the bottom of the movable spring 22, the movable spring 22 and the lower magnetic conductor 32 form a movable component, and the anti-short circuit component 3 and the movable spring 22 are arranged between the U-shaped bracket 42 and the push rod unit 41.

[0154] In one embodiment, Fig.11As shown, the relay also includes an arc extinguishing unit 5, which is arranged in the hollow chamber of the housing and is used 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 can be permanent magnets, and each arc extinguishing magnet 51 can be roughly rectangular. The two arc extinguishing magnets 51 are respectively arranged on both sides of the insulating cover 11, and are relatively arranged along the length direction of the moving spring piece 22.

[0155] In this embodiment, the two arc-extinguishing magnets 51 are respectively located on the left and right sides of the insulating cover 11. The polarities of the surfaces facing each other of the two arc-extinguishing magnets 51 are opposite. That is, the arc-extinguishing magnet 51 located on the left side of the insulating cover 11 has an S pole on the left and an N pole on the right, and the arc-extinguishing magnet 51 located on the right side of the insulating cover 11 has an S pole on the left and an N pole on the right.

[0156] Of course, the polarities of the facing surfaces of the two arc extinguishing magnets 51 can also be designed to be the same. For example, the arc extinguishing magnet 51 located on the left side of the insulating cover 11 has an S pole on the left and an N pole on the right, and the arc extinguishing magnet 51 located on the right side of the insulating cover 11 has an N pole on the left and an S pole on the right.

[0157] In this way, by providing two arc-extinguishing magnets 51 disposed opposite to each other, a magnetic field can be formed around the contact assembly 2 .

[0158] Therefore, the arc generated between the static contact lead-out terminal 21 and the movable spring piece 22 will be stretched in the direction away from each other by the action of the magnetic field, thereby achieving arc extinguishing.

[0159] The arc extinguishing unit 5 also includes two yoke iron clamps 52, and the two yoke iron clamps 52 are arranged corresponding to the positions of the two arc extinguishing magnets 51. In addition, the two yoke iron clamps 52 surround the insulating cover 11 and the two arc extinguishing magnets 51. By designing that the yoke iron clamps 52 surround the arc extinguishing magnets 51, it is possible to prevent the magnetic field generated by the arc extinguishing magnets 51 from spreading outward and affecting the arc extinguishing effect. The yoke iron clamps 52 are made of soft magnetic material. Soft magnetic materials may include but are not limited to iron, cobalt, nickel and alloys thereof.

[0160] Embodiment 2

[0161] This embodiment is similar to the first embodiment, and the only difference is that the structure of the first arc isolation groove 222 is different.

[0162] like Figure 17-Figure 19 As shown, the first arc isolation groove 222 provided in this embodiment is at least one of a linear structure, a convex structure and an X-shaped structure.

[0163] Specifically, Fig.17As shown, the first arc isolation groove 222 is a linear structure, so that the first arc isolation groove 222 is a groove structure with a simple structure and convenient production and processing. Moreover, since the groove width of the first arc isolation groove 222 along the length direction of the movable spring piece 22 is relatively narrow, the overall structural strength of the movable spring piece 22 is relatively large.

[0164] like Fig.18 As shown, the first arc isolation groove 222 is a convex structure, so that the first arc isolation groove 222 is a folded line groove structure, which increases the tortuosity of the arc transfer path, thereby improving the arc extinguishing effect.

[0165] like Fig.19 As shown, the first arc isolation groove 222 is an X-shaped structure, which includes two cross-arranged wire grooves, so that the arc on one side can be isolated from the transmission path through the two wire grooves, playing a double arc isolation role, and having good isolation and arc extinguishing effects.

[0166] It can be understood that the shapes of the two first arc isolation grooves 222 of this embodiment may be the same or different. For example, one of the first arc isolation grooves 222 is a convex structure, and the other first arc isolation groove 222 is a linear structure.

[0167] It can be understood that the first arc isolation groove 222 provided in this embodiment includes but is not limited to a linear structure and an X-shaped structure, and can also be an S-shaped structure, a conical structure, etc., and its specific shape can be adjusted according to actual production conditions.

[0168] It should be noted that if Figure 20-22 As shown, the first arc isolation groove 222 can be replaced by an arc isolation rib 225. The arrangement position and shape of the arc isolation rib 225 are similar to those of the first arc isolation groove 222 and will not be described in detail.

[0169] Embodiment 3

[0170] This embodiment is similar to the first embodiment, and the only difference is the number and structure of the arc isolation structures.

[0171] like Figure 23-Figure 24 As shown, the number of arc-isolating portions provided in this embodiment is one, and the portion of the movable spring piece 22 not provided with the arc-isolating portion and the portions on both sides along the length direction of the movable spring piece 22 respectively abut against a pair of static contact lead-out terminals 21 .

[0172] When the arc-isolating portion is specifically a first arc-isolating groove 222, since a first arc-isolating groove 222 is arranged between a pair of static contact lead-out terminals 21, the groove width of the first arc-isolating groove 222 along the length direction of the moving spring piece 22 is relatively wide, and the portion of the moving spring piece 22 that is not provided with the first arc-isolating groove 222 and the portions provided at both ends of the moving spring piece 22 along the length direction of the moving spring piece 22 are respectively two contact portions, and the two contact portions correspond to a pair of static contact lead-out terminals 21. The arc-isolating process from two groups of moving and static contacts can be realized by utilizing a first arc-isolating groove 222, the structure is simple, and the production cost is relatively low.

[0173] In one embodiment, the distance between the two side edges of the first arc isolation groove 222 along the length direction of the movable spring piece 22 is less than or equal to the distance between the bottoms of a pair of static contact lead-out terminals 21 .

[0174] Specifically, the groove width of the first arc isolation groove 222 along the length direction of the movable spring piece 22 extends to the vicinity of the inner edge of the bottom of the static contact lead-out end 21 or is flush with the inner edge of the bottom of the static contact lead-out end 21, so that the edge between the first groove wall of the first arc isolation groove 222 and the top surface of the movable spring piece 22 is as close to the bottom of the static contact lead-out end 21 as possible, the arc can be gathered at the edge as soon as possible, and the height difference between the top surface of the movable spring piece 22 and the first groove bottom of the first arc isolation groove 222 is utilized to reduce the risk of the arc transferring toward the center line direction of the movable spring piece 22.

[0175] It should be noted that if Fig.24 As shown, the first arc isolation groove 222 can be replaced by an arc isolation rib 225. The arrangement position and shape of the arc isolation rib 225 are similar to those of the first arc isolation groove 222 and will not be described in detail.

[0176] Embodiment 4

[0177] This embodiment is similar to the first embodiment and the second embodiment, except that other detailed structures of the movable spring piece 22 are added on the basis of the first embodiment or the second embodiment.

[0178] The movable spring piece 22 provided in this embodiment may also be provided with a second arc isolation groove (not shown in the figure) on the side wall of the movable spring piece 22, and the second arc isolation groove is used to prevent the arc from moving in the direction in which the pair of static contact lead-out terminals 21 approach each other.

[0179] The movable spring piece 22 provided in this embodiment has a second arc isolation groove set on the side wall of the movable spring piece 22, which prevents the arc from transferring along the side wall of the movable spring piece 22 to the center line of the movable spring piece 22 in the length direction, thereby isolating and cutting off the transfer path of the arc on the side wall of the movable spring piece 22, avoiding the arc short circuit generated by the two groups of movable and static contacts between the movable spring piece 22 and a pair of static contact lead-out terminals 21, so that the arc can be efficiently extinguished on the originally set arc extinguishing path of the magnetic blowing magnetic field, thereby improving the arc extinguishing ability.

[0180] In one embodiment, the second arc isolation groove is disposed between inner edges of the two first contact portions 220 .

[0181] In other words, the second arc-isolating groove is arranged on the inner side of the static contact lead-out terminal 21 to cut off the path of the arc transferring toward the inner side of the static contact lead-out terminal 21, avoiding the arc short circuit generated by the two groups of moving and static contacts between the moving spring piece 22 and a pair of static contact lead-out terminals 21, so as to ensure the high efficiency and thoroughness of arc extinguishing.

[0182] In one embodiment, there are multiple second arc isolation grooves, and multiple second arc isolation grooves are arranged on both sides of the movable reed piece 22 along the length direction of the movable reed piece 22; and / or, there are multiple second arc isolation grooves, and multiple second arc isolation grooves are arranged on both sides of the movable reed piece 22 along the width direction of the movable reed piece 22.

[0183] Specifically, there are four second arc isolation grooves, two of which are provided on each side of the movable spring piece 22 along its length direction, and two of which are provided on each side of the movable spring piece 22 along its width direction. The four second arc isolation grooves are arranged at the four corners of the thrust portion 221 of the movable spring piece 22, so that the arc can be isolated by the second arc isolation grooves no matter how it transfers along the side wall of the movable spring piece 22, thereby further improving the arc isolation effect.

[0184] In one embodiment, the second arc isolation groove includes a second groove wall and a second groove bottom connected to each other; wherein, the arc moves to the connection between the second groove wall and the side wall of the movable spring piece 22 to form a concentrated arc, and the height difference between the side wall of the movable spring piece 22 and the second groove bottom is used to prevent the arc from moving toward a direction in which a pair of static contact lead-out terminals 21 approach each other.

[0185] Since the second arc isolating groove has a second groove wall and a second groove bottom that are connected to each other, the connection between the second groove wall and the side wall of the movable spring piece 22 is an edge, and the arc moves to the edge to form a concentrated arc. At the same time, the height difference between the side wall of the movable spring piece 22 and the second groove bottom is the drop in the transfer path of the arc along the side wall of the movable spring piece 22. The drop makes it difficult for the arc to move toward the center line of the length direction of the movable spring piece 22. The combination of the edge and the drop is used to improve the arc extinguishing effect.

[0186] In one embodiment, the second arc isolation groove is a through groove along the axial direction of the static contact lead-out end 21 .

[0187] If the second arc isolating groove extends along the length direction of the moving spring piece 22, the arc may transfer along the part of the side wall of the moving spring piece 22 where the second arc isolating groove is not provided, and there is a risk of arc short circuit. For this reason, the second arc isolating groove is provided as a through groove along the axial direction of the static contact lead-out end 21. Since the through groove is provided in the height direction of the moving spring piece 22, after the arc enters the second arc isolating groove, the transfer path of the arc toward the direction of the pair of static contact lead-out ends 21 approaching each other is completely cut off.

[0188] It should be noted that the movable spring shown in the drawings and described in this specification is only an example of the principle of the present invention. It should be clearly understood by those skilled in the art that the principle of the present invention is not limited to any details or any components of the device shown in the drawings or described in the specification.

Claims

1. An arc isolation structure, characterized in that: include: The first arc-isolating member is installed on the moving spring piece, and the moving spring piece is used to contact or separate with a pair of static contact lead-out ends. The first arc-isolating member is used to prevent arc transfer.

2. The arc isolation structure according to claim 1, characterized in that: The first arc isolation member is sleeved on the outer wall of the movable spring piece.

3. The arc isolation structure according to claim 1, characterized in that: A first step is provided between the first arc isolation member and the movable spring piece to prevent arc transfer; and / or, A first gap is provided between the first arc isolation member and the movable spring piece to prevent arc transfer.

4. The arc isolation structure according to claim 3, characterized in that: The portion where the movable spring piece contacts the pair of static contact lead-out terminals is a first contact portion, and the first step and / or the first gap is arranged between inner edges of the first contact portion.

5. The arc isolation structure according to claim 3, characterized in that: The first arc-isolating member includes a column, the top surface of the column facing the static contact lead-out end protrudes from the top surface of the movable spring piece facing the static contact lead-out end, so that the first step is formed between the top surface of the column and the top surface of the movable spring piece.

6. The arc isolation structure according to claim 5, characterized in that: The side wall of the movable spring is provided with a mounting groove, the column is at least partially disposed in the mounting groove, and the first gap is disposed between the column and the mounting groove.

7. The arc isolation structure according to claim 6, characterized in that: The first gap is arranged along the axial direction of the column.

8. The arc isolation structure according to claim 6, characterized in that: An end of the first gap facing the static contact lead-out end is provided with an open end, and an end of the first gap facing away from the static contact lead-out end is a closed end.

9. The arc isolation structure according to claim 6, characterized in that: The mounting groove comprises a first mounting portion, the first mounting portion is arranged on a side of the movable spring piece facing the static contact lead-out end, the column passes through the first mounting portion, and the first gap is arranged between the column and the first mounting portion.

10. The arc isolation structure according to claim 9, wherein the mounting groove further comprises a fixing portion, the fixing portion is communicated with the first mounting portion, and the column is clamped on the fixing portion for fixing the first arc isolation member.

11. According to the arc isolation structure of claim 10, the mounting groove also includes a second mounting portion, the second mounting portion is arranged on a side of the moving spring away from the static contact lead-out end, the second mounting portion is connected to the first mounting portion through the fixing portion, the column is passed through the second mounting portion and a first guide gap is provided between the outer wall of the column and the inner wall of the second mounting portion, and the first guide gap is used for guiding the column.

12. The arc isolation structure according to claim 5, characterized in that: The first arc-isolating member further comprises a limiting portion, which is arranged on a side of the column away from the movable spring piece and can abut against the movable spring piece for limiting the position of the column.

13. The arc isolation structure according to claim 5, characterized in that: The first arc-isolating member further comprises an arc-isolating ring, and the arc-isolating ring wraps around the end of the movable spring piece along the length direction of the movable spring piece and at least a part of the side wall of the movable spring piece.

14. The arc isolation structure according to claim 13, characterized in that: The first arc-isolating member further comprises a connecting portion, which is arranged at the bottom of the end of the movable spring piece away from the static contact lead-out end and is respectively connected to the two ends of the arc-isolating ring, and the column is arranged at the connecting portion.

15. A contact unit, characterized in that: It comprises a movable reed, a pair of static contact lead-out terminals and an arc-isolating structure as described in any one of claims 1 to 14, wherein the movable reed is used to contact or separate from the pair of static contact lead-out terminals, the arc-isolating structure is arranged outside the movable reed, and the arc-isolating structure is used to hinder arc transfer.

16. The contact unit according to claim 15, characterized in that The side of the movable spring piece facing the static contact lead-out end is the top surface of the movable spring piece, and the top surface of the movable spring piece is provided with an arc isolation portion, which is used to prevent the arc from moving in the direction of the pair of static contact lead-out ends approaching each other.

17. The contact unit according to claim 16, characterized in that The arc isolation portion is a first arc isolation groove; and / or, The arc isolation portion is an arc isolation rib.

18. The contact unit according to claim 16, characterized in that The portion where the movable spring piece contacts the pair of static contact lead-out terminals is a first contact portion, and the arc-isolating portion is arranged between the inner edges of the first contact portion.

19. A relay, characterized in that: Comprising the contact unit according to any one of claims 15 to 18.

20. The relay according to claim 19, characterized in that It also includes an anti-short circuit component, which is at least arranged on one side of the moving reed piece facing the static contact lead-out end, and generates suction when a large fault current occurs in the moving reed piece, so as to resist the electric repulsion between the moving reed piece and the static contact lead-out end.

Images