relay

Abstract

The relay comprises a contact container (10), a pair of fixed contact lead-out ends (20), a first magnetic conductive body (40), a push rod assembly (50), and a movable contact assembly (53), wherein the first magnetic conductive body (40) is fixedly provided relative to the contact container (10), the push rod assembly (50) includes a push rod (51) and a second magnetic conductive body (60), the push rod (51) is movable along the axial direction of the push rod (51) relative to the contact container (10), and the second magnetic conductive body (60) is provided at one end of the push rod (51) and is offset from the first magnetic conductive body (40) along the axial direction of the push rod (51). The movable contact assembly (53) includes a movable contact piece (54) and a third magnetic conductive body (55), and the third magnetic conductive body (55) is fixedly connected to the side of the movable contact piece (54) away from the first magnetic conductive body (40) and the second magnetic conductive body (60) along the axial direction of the push rod (51).

Description

[Technical Field]

[0001] [Cross-Citation of Related Applications] This disclosure claims priority to a Chinese patent application filed on October 12, 2022, bearing application number 202211249316.5 and titled "RELAY," the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to relays. [Background technology]

[0003] A relay is an electronic control element that has a control system (also called input circuit) and a controlled system (also called output circuit), and is usually applied in automatic control circuits. A relay is actually an "automatic switch" that uses a small current to control a large current. Therefore, a relay plays a role in the circuit, such as automatic adjustment, safety protection, and conversion circuit.

[0004] High-voltage DC relays are a type of relay. To address the problem of contacts of high-voltage DC relays being flipped off due to the electromotive repulsive force caused by short-circuit current, related technologies typically use short-circuit-resistant ring electromagnetic structures. Depending on the installation location of the upper yoke, they can be further divided into a tracking structure and a fixed structure. Specifically, a tracking structure refers to an upper yoke being located on the moving assembly of the relay, while a fixed structure refers to an upper yoke being located in a fixed position other than the moving assembly. However, while the fixed structure significantly enhances short-circuit resistance, the interrupting capability is reduced due to the negative correlation between short-circuit resistance and interrupting capability. However, a tracking structure is affected by the holding force of the moving core. Under high short-circuit currents, the core will disengage and the contacts will separate. Increasing the holding force of the moving core requires a larger coil, which contradicts the goal of miniaturization and weight reduction. Summary of the Invention

[0005] The embodiments of the present disclosure provide a relay that combines short-circuit withstand capability with ultimate breaking capability.

[0006] According to one aspect of the present disclosure, a relay according to an embodiment of the present disclosure includes a contact receptacle, a pair of fixed contact leads, a first magnetic conductive body, a push rod assembly, and Moving Contact Assembly Li The contact container has a contact chamber, and a pair of fixed contact lead ends are connected to the contact container. It is fixedly set for a first magnetic conductive body provided in the contact chamber and fixedly provided with respect to the contact container; a push rod assembly including a push rod and a second magnetic conductive body, the push rod being movable along the axial direction of the push rod relative to the contact container; the second magnetic conductive body provided at one end of the push rod and offset from the first magnetic conductive body along the axial direction of the push rod; and a movable contact assembly being movable along the axial direction of the push rod relative to the push rod assembly, the first magnetic conductive body being offset from the first magnetic conductive body near the fixed contact lead-out end. and a second position remote from the fixed contact pull-out end, the movable contact assembly including a movable contact piece and a third magnetic conductive body, the first magnetic conductive body and the second magnetic conductive body being arranged on the side of the movable contact piece facing the fixed contact pull-out end, the third magnetic conductive body being fixedly provided on the side of the movable contact piece facing away from the first magnetic conductive body and the second magnetic conductive body along the axial direction of the push rod, the third magnetic conductive body and the first magnetic conductive body forming a first magnetic circuit, and the third magnetic conductive body and the second magnetic conductive body forming a second magnetic circuit.

[0007] According to one embodiment of the present disclosure, a pair of the fixed contact lead ends are connected to the contact receptacle, and at least a portion of each of the fixed contact lead ends is located within the contact chamber.

[0008] According to one embodiment of the present disclosure, the device further includes an elastic member that connects the movable contact assembly and the push rod assembly and applies an elastic force to the movable contact assembly to move it toward the first position.

[0009] According to one embodiment of the present disclosure, when the movable contact assembly is in the first position, the magnetic spacing between the first magnetic body and the third magnetic body is greater than the magnetic spacing between the second magnetic body and the third magnetic body.

[0010] According to one embodiment of the present disclosure, when the movable contact assembly is in the first position, the second magnetic conductive body and the third magnetic conductive body are in direct contact with each other.

[0011] According to one embodiment of the present disclosure, the push rod assembly further includes a support seat, the support seat being fixedly provided at one axial end of the push rod and extending at least partially into the contact chamber, the second magnetic conductive body being fixedly connected to the support seat, and the elastic member being provided between the movable contact assembly and the support seat.

[0012] According to one embodiment of the present disclosure, the support seat comprises: a base connected to one end of the push rod, the elastic member being disposed between the base and the movable contact assembly; The present invention also includes a bracket connected to the base, wherein the second magnetic conductive body is connected to an inner wall surface of the bracket, and the movable contact piece and the third magnetic conductive body are movably arranged in a space surrounded by the base and the bracket.

[0013] According to one embodiment of the present disclosure, the bracket comprises: a top portion having an inner wall surface connected to the second magnetic conductive body; and two side portions connected to either side of the top, each having one end remote from the top connected to the base, the two side portions, the top and the base together forming a space for the movable contact assembly to move.

[0014] According to one embodiment of the present disclosure, the first magnetic body has a perforation, the perforation penetrates two opposing sides of the first magnetic body along the axial direction of the push rod, and the position of the second magnetic body along the axial direction of the push rod corresponds to the perforation.

[0015] According to one embodiment of the present disclosure, the second magnetic conductive body includes a first magnetic conductive member and a second magnetic conductive member, The first magnetic conductive member and the second magnetic conductive member are arranged side by side along the longitudinal direction of the movable contact piece, and are respectively located on two opposite side surfaces of the first magnetic conductive body. According to one embodiment of the present disclosure, the contact container further has a pair of first and second through holes, the first and second through holes are both connected to the contact chamber, and the pair of fixed contact lead-out ends are drilled in the pair of first through holes in a one-to-one correspondence; The relay further includes a connecting member, the connecting member being inserted into the second through hole and having a first end and a second end, the first end being connected to the contact container and the second end being connected to the first magnetic conductive body.

[0016] According to one embodiment of the present disclosure, the contact vessel includes a yoke plate and an insulating cover; the insulating cover includes a top wall and a side wall, one end of the side wall being connected around the top wall and the other end of the side wall being connected to the yoke plate; The first through hole and the second through hole are opened in the top wall, and a first end of the connecting member is connected to an outer wall surface of the top wall.

[0017] According to one embodiment of the present disclosure, the insulating cover includes a ceramic cover and a flange member, the ceramic cover includes the top wall and the side wall, and the other end of the side wall is connected to the yoke plate via the flange member, a first metallized layer is provided around the first through hole on an outer wall surface of the top wall, and a second metallized layer is provided around the second through hole; The fixed contact lead end is welded to the top wall through the first metallization layer, and the first end of the connecting member is welded to the top wall through the second metallization layer.

[0018] According to one embodiment of the present disclosure, the top wall and the side wall are integrally formed, or the top wall and the side wall are separate structures. be .

[0019] According to one embodiment of the present disclosure, the first magnetic conductive body is disposed spaced apart from the inner wall surface of the top wall.

[0020] According to one embodiment of the present disclosure, the contact container includes a yoke plate and an insulating cover connected to the yoke plate, The relay further includes a fixed frame, the fixed frame being disposed within the contact chamber and fixedly connected to the yoke plate, and the first magnetic conductive body being fixedly connected to the fixed frame.

[0021] According to one embodiment of the present disclosure, the first magnetic conductive body has a connection hole, and the connection member is inserted into the connection hole.

[0022] One embodiment of the above invention has at least the following advantages or beneficial effects.

[0023] In the relay of the embodiment of the present disclosure, the first magnetic body is fixed to the contact container, a fixed short-circuit resistant structure is formed between the first magnetic body and the third magnetic body, a follow-up short-circuit resistant structure is formed between the second magnetic body and the third magnetic body of the push rod assembly, and the first magnetic body and the second magnetic body are arranged offset along the axial direction of the push rod. Therefore, the relay of the embodiment of the present disclosure not only meets the requirements for short-circuit resistance and ultimate breaking, but also has the advantages of reducing the cost and size of the relay. [Brief explanation of the drawings]

[0024] These and other features and advantages of the present disclosure will become more apparent from the detailed description of illustrative embodiments thereof with reference to the drawings. [Figure 1] 1 is a schematic perspective view of a relay according to a first embodiment of the present disclosure; [Figure 2] This is a schematic diagram of the ceramic cover and flange member removed from FIG. [Figure 3] A schematic top view of FIG. 1 is shown. [Figure 4] 4 shows a cross-sectional view taken along line AA in FIG. [Figure 5] An exploded schematic diagram of Figure 1 is shown. [Figure 6] 4 shows a cross-sectional view taken along line BB in FIG. 3, in which the ceramic cover, flange member, and connecting member are omitted, and overtravel has already been completed. [Figure 7] 4 shows a cross-sectional view taken along line CC in FIG. 3, in which the ceramic cover, flange member, and connecting member are omitted, and overtravel has already been completed. [Figure 8] 4 shows a cross-sectional view taken along line AA in FIG. 3, in which the ceramic cover, flange member, and connecting member are omitted, and overtravel has already been completed. [Figure 9] 4 shows a cross-sectional view taken along line BB in FIG. 3, in which the ceramic cover, flange member, and connecting member are omitted, and the movable contact piece has just come into contact with or just separated from the fixed contact lead-out end. [Figure 10] 4 shows a cross-sectional view taken along line CC in FIG. 3, in which the ceramic cover, flange member, and connecting member are omitted, and the movable contact piece has just come into contact with or just separated from the fixed contact lead-out end. [Figure 11] 4 shows a cross-sectional view taken along line AA in FIG. 3, in which the ceramic cover, flange member, and connecting member are omitted, and the movable contact piece has just come into contact with or just separated from the fixed contact lead-out end. [Figure 12] FIG. 10 shows a schematic top view of a relay according to a second embodiment of the present disclosure. [Figure 13] This is a schematic diagram of the structure shown in FIG. 12 with the ceramic cover and flange member removed. [Figure 14] 13 shows a cross-sectional view taken along line DD in FIG. 12. [Figure 15] 13 shows an exploded schematic view of FIG. 12. [Figure 16] 13 shows a cross-sectional view taken along line EE in FIG. 12, in which the ceramic cover, flange member, and connecting member are omitted, and overtravel has already been completed. [Figure 17]13 shows a cross-sectional view taken along line FF in FIG. 12, in which the ceramic cover, flange member, and connecting member are omitted, and the overtravel has already been completed. [Figure 18] 13 shows a cross-sectional view taken along line DD in FIG. 12, in which the ceramic cover, flange member, and connecting member are omitted, and the overtravel has already been completed. [Figure 19] 13 shows a cross-sectional view taken along line EE in FIG. 12, in which the ceramic cover, flange member, and connecting member are omitted, and the movable contact piece has just come into contact with or just separated from the fixed contact lead-out end. [Figure 20] 13 shows a cross-sectional view taken along line FF in FIG. 12, in which the ceramic cover, flange member, and connecting member are omitted, and the movable contact piece has just come into contact with or just separated from the fixed contact lead-out end. [Figure 21] 13 shows a cross-sectional view taken along line DD in FIG. 12, in which the ceramic cover, flange member, and connecting member are omitted, and the movable contact piece has just come into contact with or just separated from the fixed contact lead-out end. [Figure 22] 1 shows an exploded schematic view of a relay according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0025] The symbols are as follows:

[0026] 10, contact vessel; 101, contact chamber; 102, first through-hole; 103, second through-hole; 11a, insulating cover; 11, ceramic cover; 111, top wall; 112, side wall; 113, first metallization layer; 114, second metallization layer; 12, flange member; 13, yoke plate; 131, third through-hole; 20, fixed contact lead-out end; 30, connecting member; 31, first end of connecting member; 32, second end of connecting member; 40, first magnetic conductive body; 41, perforation; 50, push rod assembly; 51, push rod; 52, support seat; 521, base; 522, bracket; 523, top portion; 524, side portion; 525, opening; 53, movable contact assembly; 54, movable contact piece; 55, third magnetic conductive body; 56, elastic member; 60, second magnetic conductive body; 610, first magnetic conductive member; 620, second magnetic conductive member; 1100, housing; 1110, first case; 1120, second case; 1130, exposure hole; 1200, electromagnet unit; 1210, coil bobbin; 1220, coil; 1240, movable core; 1250, reset member; 1300, arc-extinguishing unit; 1310, arc-extinguishing magnet; 1320, yoke clamp; 1400, seal unit; 1410, metal cover; D1, direction of movement; D2, longitudinal direction.

[0027] Next, exemplary embodiments will be described in more detail with reference to the drawings. However, the exemplary embodiments may be embodied in various forms and should not be understood as being limited to the embodiments described herein. Although relative terms such as "upper" and "lower" are used herein to describe the relative relationship between one component and another component shown in the figures, these terms are used herein only for convenience, such as according to the exemplary orientation shown in the figures. It will be understood that if the device shown in the figures is turned upside down, the component described as "upper" would become the "lower" component. Other relative terms such as "top" and "bottom" have similar meanings. When a structure is "upper" of another structure, this may mean that the structure is integrally formed on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.

[0028] The terms "a," "an," "the," and "said" are used to indicate the presence of one or more elements / components etc. The terms "comprise" and "have" are used to indicate an open inclusion and mean that there may be additional elements / components etc. in addition to the listed elements / components etc. The terms "first," "second," etc. are used as markers only and not as quantitative limitations on their subject matter.

[0029] As shown in Fig. 22, Fig. 22 shows an exploded schematic view of a relay according to an embodiment of the present disclosure. The relay includes a housing 1100, an electromagnet unit 1200, an arc-extinguishing unit 1300, and a seal unit 1400. The seal unit 1400 is disposed within the housing 1100, and the top of the fixed contact lead-out end 20 of the seal unit 1400 is exposed to the outer surface of the housing 1100 through an exposure hole 1130 of the housing 1100. The electromagnet unit 1200 and the arc-extinguishing unit 1300 are both disposed within the housing 1100.

[0030] As an example, the housing 1100 includes a first case 1110 and a second case 1120, which are engaged and connected to form a chamber for accommodating the electromagnet unit 1200, the arc-extinguishing unit 1300, and the seal unit 1400.

[0031] The arc-extinguishing unit 1300 is used to extinguish an arc that occurs between the fixed contact lead-out end 20 of the seal unit 1400 and the movable contact piece 54 . As an example, the arc-extinguishing unit 1300 includes two arc-extinguishing magnets 1310. The arc-extinguishing magnets 1310 are permanent magnets, and each may have a substantially rectangular parallelepiped shape. The two arc-extinguishing magnets 1310 are disposed on either side of the seal unit 1400, facing each other along the longitudinal direction D2 of the movable contact piece 54.

[0032] By providing two opposing arc-extinguishing magnets 1310, a magnetic field can be formed around the fixed contact pull-out end 20 and the movable contact piece 54. Therefore, the arc generated between the fixed contact pull-out end 20 and the movable contact piece 54 is stretched away from each other by the action of the magnetic field, thereby realizing arc extinction.

[0033] The arc-extinguishing unit 1300 further includes two yoke clamps 1320 positioned corresponding to the positions of the two arc-extinguishing magnets 1310. The two yoke clamps 1320 surround the seal unit 1400 and the two arc-extinguishing magnets 1310. The design of the yoke clamps 1320 surrounding the arc-extinguishing magnets 1310 prevents the magnetic field generated by the arc-extinguishing magnets 1310 from diffusing outward and affecting the arc-extinguishing effect. The yoke clamps 1320 are made of a soft magnetic material, including, but not limited to, iron, cobalt, nickel, and alloys thereof.

[0034] As shown in FIGS. 1 to 5, FIG. 1 shows a schematic perspective view of a relay according to a first embodiment of the present disclosure. FIG. 2 shows a schematic view in which a ceramic cover 11 and a flange member 12 are removed from FIG. 1. FIG. 3 shows a schematic top view of FIG. 1. FIG. 4 shows a cross-sectional view taken along line AA in FIG. 3. FIG. 5 shows an exploded schematic view of FIG. 1.

[0035] The seal unit 1400 of the embodiment of the present disclosure includes a contact receptacle 10 , a pair of fixed contact pull-out ends 20 , a first magnetic conductive body 40 , a push rod assembly 50 , a movable contact assembly 53 , and an elastic member 56 .

[0036] It will be understood that the terms "comprises" and "having," and any variations thereof, in embodiments of the present disclosure are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally includes other steps or units inherent to such process, method, product, or device.

[0037] The contact vessel 10 has therein a contact chamber 101. The contact vessel 10 includes an insulating cover 11a and a yoke plate 13. The insulating cover 11a covers one side of the yoke plate 13, and the contact chamber 101 is formed by being surrounded by the insulating cover 11a and the yoke plate 13.

[0038] The insulating cover 11a includes a ceramic cover 11 and a flange member 12. The ceramic cover 11 is connected to the yoke plate 13 via the flange member 12. The flange member 12 may be a ring-shaped metal part made of an iron-nickel alloy or the like, and one end of the flange member 12 is connected to the edge of the opening of the ceramic cover 11 by laser welding, brazing, resistance welding, adhesive bonding, or the like. The other end of the flange member 12 is connected to the yoke plate 13, and may also be connected by laser welding, brazing, resistance welding, adhesive bonding, or the like. By providing the flange member 12 between the ceramic cover 11 and the yoke plate 13, the connection between the ceramic cover 11 and the yoke plate 13 can be facilitated.

[0039] The ceramic cover 11 has a top wall 111 and a side wall 112, one end of the side wall 112 is connected to the periphery of the top wall 111, and the other end of the side wall 112 is connected to the yoke plate 13 via a flange member 12. In this embodiment, the other end of the side wall 112 is connected to the yoke plate 13 via the flange member 12.

[0040] The contact container 10 further has a pair of first and second through holes 102 and 103, both of which are connected to the contact chamber 101. The first through hole 102 is for allowing the fixed contact lead-out end 20 to pass through, and the second through hole 103 is for allowing the connecting member 30 to pass through.

[0041] As an example, the first through hole 102 and the second through hole 103 are both opened in the top wall 111 of the ceramic cover 11. The second through hole 103 may be disposed between the two first through holes 102. That is, the connecting member 30 is disposed between the pair of fixed contact lead-out ends 20.

[0042] The number of second through holes 103 may be two so as to allow two connection members 30 to pass through, but is not limited to this.

[0043] A pair of fixed contact lead-out ends 20 are connected to the contact container 10, and at least a portion of each fixed contact lead-out end 20 is located within the contact chamber 101. One of the pair of fixed contact lead-out ends 20 functions as a current input terminal, and the other functions as a current output terminal.

[0044] The pair of fixed contact lead-out ends 20 are drilled in a pair of first through-holes 102 in a one-to-one correspondence, and are connected to the top wall 111 of the ceramic cover 11 by, for example, welding.

[0045] The bottom of the fixed contact lead-out end 20 serves as the fixed contact, and the fixed contact may be provided integrally with or separately from the bottom of the fixed contact lead-out end 20 . The first magnetic conductive body 40 is disposed in the contact chamber 101 and is fixedly provided with respect to the contact vessel 10 .

[0046] The push rod assembly 50 is connected to the contact container 10 so as to be movable along a movement direction D1. The push rod assembly 50 includes a push rod 51, a support seat 52, and a second magnetic conductive body 60. The push rod 51 is movable along the axial direction of the push rod 51 (i.e., the movement direction D1) relative to the contact container 10, the support seat 52 is fixedly disposed at one axial end of the push rod 51 and extends at least partially into the contact chamber 101, and the second magnetic conductive body 60 is fixedly connected to the support seat 52 and is offset from the first magnetic conductive body 40 along the axial direction of the push rod 51.

[0047] It should be noted that the offset between the second magnetic body 60 and the first magnetic body 40 along the axial direction of the push rod 51 can be understood as the orthogonal projection of the second magnetic body 60 onto the movable contact piece along the axial direction of the push rod 51 not overlapping with the orthogonal projection of the first magnetic body 40 onto the movable contact piece.

[0048] As an example, the second magnetic conductive body 60 and the support seat 52 may be fixed by caulking, but the present invention is not limited to this.

[0049] The yoke plate 13 has a third through hole 131, which penetrates two opposing sides of the yoke plate 13 along the thickness direction of the yoke plate 13 and is connected to the contact chamber 101 of the contact vessel 10. The push rod 51 is drilled in the third through hole 131 so as to be movable along the axial direction.

[0050] Of course, in other embodiments, the push rod assembly 50 may have other structures, which will not be listed one by one here.

[0051] The movable contact assembly 53 is movable relative to the push rod assembly 50 along the axial direction of the push rod 51 between a first position close to the fixed contact pull-out end 20 and a second position away from the fixed contact pull-out end 20. The movable contact assembly 53 includes a movable contact piece 54 and a third magnetic conductive body 55, and the first magnetic conductive body 40 and the second magnetic conductive body 60 are arranged on a side of the movable contact piece 54 facing the fixed contact pull-out end 20, and the third magnetic conductive body 55 is fixedly connected to a side of the movable contact piece 54 away from the first magnetic conductive body 40 and the second magnetic conductive body 60 along the axial direction of the push rod 51. That is, along the thickness direction of the movable contact piece 54 (i.e., the movement direction D1), the first magnetic conductive body 40 and the second magnetic conductive body 60 are arranged on one side of the movable contact piece 54, and the third magnetic conductive body 55 is arranged on the other side of the movable contact piece 54.

[0052] The movable contact assembly 53 is movable relative to the push rod assembly 50 between a first position and a second position along the axial direction of the push rod 51, where the "first position" and "second position" refer to the relative positions of the movable contact assembly 53 and the push rod assembly 50.

[0053] Specifically, when the electromagnet unit 1200 is energized, the electromagnet unit 1200 can drive the push rod 51, the support seat 52, and the movable contact assembly 53 to move together in a direction toward the fixed contact pull-out end 20. When the movable contact assembly 53 contacts the fixed contact pull-out end 20, the movable contact assembly 53 is stopped by the fixed contact pull-out end 20, but the push rod 51 and the support seat 52 continue to move upward until the overtravel process is completed. During the overtravel process, relative movement occurs between the movable contact assembly 53 and the push rod assembly 50.

[0054] When the movable contact assembly 53 is defined as being stationary during the over-travel process, the push rod assembly 50 moves upward relative to the movable contact assembly 53. When the push rod assembly 50 is defined as being stationary during the over-travel process, the movable contact assembly 53 moves downward relative to the push rod assembly 50.

[0055] Then, when the movable contact assembly 53 and the fixed contact pull-out end 20 are separated or have just come into contact, the movable contact assembly 53 is located at a first position relative to the push rod assembly 50, i.e., the movable contact assembly 53 is close to the fixed contact pull-out end 20 relative to the push rod assembly 50. In the overtravel process, the movable contact assembly 53 moves downward relative to the push rod assembly 50, i.e., the movable contact assembly 53 moves in a direction away from the fixed contact pull-out end 20 relative to the push rod assembly 50, until the movable contact assembly 53 moves to a second position relative to the push rod assembly 50. When the movable contact assembly 53 moves to the second position relative to the push rod assembly 50, the overtravel is completed. At this time, the compression amount of the elastic member 56 reaches a maximum value.

[0056] It can be seen that when the movable contact assembly 53 is in a first position relative to the push rod assembly 50, the movable contact assembly 53 and the fixed contact lead end 20 are considered to be separated or just coming into contact with each other. When the movable contact assembly 53 is in a second position relative to the push rod assembly 50, overtravel is complete.

[0057] As an example, the third magnetic conductive body 55 and the movable contact piece 54 may be fixed by caulking, but the present invention is not limited to this.

[0058] It will be appreciated that the first magnetic conductor 40, the second magnetic conductor 60, and the third magnetic conductor 55 may all be made of materials such as iron, cobalt, nickel, and alloys thereof.

[0059] In one embodiment, the first magnetic conductive body 40 and the second magnetic conductive body 60 may be linearly shaped, and the third magnetic conductive body 55 may be U-shaped, but is not limited to this.

[0060] It will be appreciated that the first magnetic conductive body 40, the second magnetic conductive body 60, and the third magnetic conductive body 55 can be designed to include multiple stacked magnetic conductive pieces, if desired.

[0061] Both ends of the movable contact piece 54 are used to contact the bottoms of the pair of fixed contact pull-out ends 20 to achieve contact closure. Both ends of the movable contact piece 54 along the longitudinal direction D2 can function as movable contacts. The movable contacts at both ends of the movable contact piece 54 may protrude further than the other parts of the movable contact piece 54 or may be flush with the other parts.

[0062] It can be understood that the movable contacts may be provided integrally with the movable contact piece 54 at both ends in the longitudinal direction D2, or may be provided separately.

[0063] The elastic member 56 is disposed between the movable contact assembly 53 and the support seat 52 and is used to apply an elastic force to the movable contact assembly 53 to move it toward the first position.

[0064] By way of example, and not limitation, the resilient member 56 may be a spring.

[0065] In one embodiment, one end of the elastic member 56 abuts against the support seat 52 , and the other end abuts against the third magnetic conductive body 55 of the movable contact assembly 53 .

[0066] Of course, in other embodiments, a through hole may be formed in the third magnetic conductive body 55, and the elastic member 56 may pass through the through hole and come into contact with the movable contact piece 54.

[0067] The support seat 52 includes a base 521 and a bracket 522. The base 521 is connected to one axial end of the push rod 51, and the bracket 522 is connected to the base 521. The second magnetic conductive body 60 is connected to the inner wall surface of the bracket 522, the movable contact piece 54 and the third magnetic conductive body 55 are movably disposed between the base 521 and the bracket 522, and one end of the elastic member 56 abuts against the base 521 and the other end abuts against the third magnetic conductive body 55.

[0068] In one embodiment, the bracket 522 is inverted U-shaped and can engage with the base 521. The base 521 and the bracket 522 enclose a chamber, which is used to house the movable contact assembly 53 and the resilient member 56.

[0069] The bracket 522 may include a top portion 523 and two side portions 524, which are connected to either side of the top portion 523 and extend from the top portion 523 toward the base 521, thereby forming an inverted U-shape of the bracket 522. One end of each of the two side portions 524 remote from the top portion 523 is connected to the base 521. A space is formed between the two side portions 524 to allow the movable contact piece 54 and the third magnetic conductive body 55 to pass through and move.

[0070] The second magnetic conductive body 60 is connected to the inner wall surface of the top portion 523. When the movable contact piece 54 is not in contact with the fixed contact pull-out end 20 or when the movable contact piece 54 has just come into contact with the fixed contact pull-out end 20, the movable contact piece 54 abuts against the second magnetic conductive body 60 due to the elastic force of the elastic member 56. During the overtravel process, the fixed contact pull-out end 20 stops the movable contact assembly 53 (the movable contact piece 54 and the third magnetic conductive body 55) and keeps the movable contact assembly 53 stationary, while the push rod 51 drives the support seat 52 together with the second magnetic conductive body 60 to continue moving upward, and at this time, the movable contact assembly 53 and the base 521 press against the elastic member 56 together.

[0071] It can be understood that in other embodiments, the second magnetic conductive body 60 may not be fixedly connected to the bracket 522 of the support seat 52, but may be fixedly connected to one end of the push rod 51. Specifically, a through hole is provided in the movable contact assembly 53, the push rod 51 is inserted into the through hole of the movable contact assembly 53, and the second magnetic conductive body 60 is provided at one end of the push rod 51.

[0072] The seal unit 1400 further includes a metal cover 1410, which is connected to the side of the yoke plate 13 facing away from the insulating cover 11a and covers the third through-hole 131 of the yoke plate 13. The metal cover 1410 and the yoke plate 13 are enclosed as a chamber for accommodating the fixed iron core and the movable iron core 1240 of the electromagnet unit 1200, which will be described in detail later.

[0073] As shown in FIGS. 4 and 22 , the electromagnet unit 1200 includes a coil bobbin 1210, a coil 1220, a fixed iron core (not shown), a movable iron core 1240, and a reset member 1250. The coil bobbin 1210 is hollow and cylindrical, and is made of an insulating material. A metal cover 1410 is provided inside the coil bobbin 1210. The coil 1220 surrounds the coil bobbin 1210. The fixed iron core is fixedly provided inside the metal cover 1410, and a portion of the fixed iron core fits into the third through-hole 131. The fixed iron core has a hole, which is provided at a position corresponding to the third through-hole 131, and is for inserting the push rod 51 therein. The movable iron core 1240 is movably provided within the metal cover 1410 and is provided opposite the fixed iron core 1230. The movable iron core 1240 is connected to the push rod 51 and is used to be attracted to the fixed iron core when the coil 1220 is energized. The movable iron core 1240 and the push rod 51 can be connected by screwing, caulking, welding, or other methods.

[0074] The reset member 1250 is located inside the metal cover 1410 and is disposed between the fixed core and the movable core 1240, and is used to reset the movable core 1240 when the power supply to the coil 1220 is cut off. The reset member 1250 may be a spring, and is sleeved onto the outside of the push rod 51.

[0075] As shown in Figures 6 to 8, Figure 6 shows a cross-sectional view taken along line BB in Figure 3, in which the ceramic cover, flange member, and connecting member are omitted and overtravel has already been completed. Figure 7 shows a cross-sectional view taken along line CC in Figure 3, in which the ceramic cover, flange member, and connecting member are omitted and overtravel has already been completed. Figure 8 shows a cross-sectional view taken along line AA in Figure 3, in which the ceramic cover, flange member, and connecting member are omitted and overtravel has already been completed.

[0076] 6 to 8 show a state where overtravel has already been completed, in which the movable contact assembly 53 is considered to be in the second position relative to the push rod assembly 50.

[0077] 6 and 7 , a first magnetic conductive circuit is formed between the first magnetic conductive body 40 and the third magnetic conductive body 55, and therefore a magnetic attractive force is generated between the first magnetic conductive body 40 and the third magnetic conductive body 55. A second magnetic conductive circuit is formed between the second magnetic conductive body 60 and the third magnetic conductive body 55, and therefore a magnetic attractive force is generated between the second magnetic conductive body 60 and the third magnetic conductive body 55. Since the first magnetic conductive body 40 is fixedly provided with respect to the contact container 10, when a short-circuit current flows, a fixed short-circuit resistant structure is formed between the first magnetic conductive body 40 and the third magnetic conductive body 55, and the holding force of the fixed short-circuit resistant structure is provided by the contact container 10. Because the second magnetic conductive body 60 is fixedly connected to the support seat 52 of the push rod assembly 50, when a short-circuit current flows, a compliant short-circuit resistant structure is formed between the second magnetic conductive body 60 and the third magnetic conductive body 55, and the holding force of the compliant short-circuit resistant structure is provided by the coil 1220 of the relay. Assuming that the driving force of the coil 1220 is constant, the double short-circuit resistant structure of the embodiment of the present disclosure effectively improves the upper limit of the short-circuit withstand current capacity.

[0078] 8 , the second magnetic conductive body 60 and the first magnetic conductive body 40 are offset along the axial direction of the push rod 51. This prevents the first magnetic circuit formed between the first magnetic conductive body 40 and the third magnetic conductive body 55 from affecting the second magnetic circuit formed between the second magnetic conductive body 60 and the third magnetic conductive body 55. This prevents the magnetic attractive forces of the first magnetic conductive body 40 and the second magnetic conductive body 60 from affecting each other, ensuring short-circuit resistance. Furthermore, compared to the technical solution of overlapping magnetic conductive bodies, the offset arrangement of the first magnetic conductive body 40 and the second magnetic conductive body 60 in the embodiment of the present disclosure prevents their magnetic attractive forces from affecting each other. This allows the thickness of the first magnetic conductive body 40 to be reduced under the condition that they resist the same magnitude of electromechanical repulsive force, thereby reducing not only costs but also the volume of the relay.

[0079] As shown in Figures 9 to 11, Figure 9 shows a cross-sectional view taken along line BB in Figure 3, in which the ceramic cover, flange member, and connecting member are omitted, and the movable contact piece 54 has just come into contact with or been separated from the fixed contact lead-out end 20. Figure 10 shows a cross-sectional view taken along line CC in Figure 3, in which the ceramic cover, flange member, and connecting member are omitted, and the movable contact piece 54 has just come into contact with or been separated from the fixed contact lead-out end 20. Figure 11 shows a cross-sectional view taken along line AA in Figure 3, in which the ceramic cover, flange member, and connecting member are omitted, and the movable contact piece 54 has just come into contact with or been separated from the fixed contact lead-out end 20.

[0080] 9 to 11 show the state where the movable contact piece 54 and the fixed contact lead-out end 20 have just come into contact with each other or have just separated from each other. In this state, the movable contact assembly 53 can be considered to be in the first position relative to the push rod assembly 50.

[0081] In order to conveniently illustrate the effect that the relay of the present disclosure not only improves the short-circuit resistance capability but also satisfies the requirement for breaking overload current, FIGS. 9 to 11 show an example in which the movable contact piece 54 and the fixed contact lead-out end 20 have just been separated from each other.

[0082] When the relay coil 1220 is de-energized, the relay's movable core 1240 acts to move the push rod assembly 50 downward relative to the fixed contact end 20. This corresponds to the movable contact assembly 53 moving from the second position to the first position relative to the push rod assembly 50, i.e., switching from FIG. 7 to FIG. 10. As the movable contact assembly 53 moves from the second position to the first position, the magnetic gap between the second magnetic conductive body 60 and the third magnetic conductive body 55 gradually decreases. When the movable contact assembly 53 moves to the first position, the second magnetic conductive body 60 comes into contact with the movable contact assembly 53. At this time, the magnetic gap between the second magnetic conductive body 60 and the third magnetic conductive body 55 is smaller than the magnetic gap between the first magnetic conductive body 40 and the third magnetic conductive body 55.

[0083] It is understood that most of the magnetic flux flows in the magnetic circuit with a small magnetic gap, that is, in the magnetic circuit formed by the second magnetic conductive body 60 and the third magnetic conductive body 55. For example, as shown in Fig. 9, one magnetic flux line is formed between the first magnetic conductive body 40 and the third magnetic conductive body 55. As shown in Fig. 10, three magnetic flux lines are formed between the second magnetic conductive body 60 and the third magnetic conductive body 55.

[0084] At this time, the magnetic attractive force between the second magnetic conductive body 60 and the third magnetic conductive body 55 is relatively large, while the magnetic attractive force between the first magnetic conductive body 40 and the third magnetic conductive body 55 is relatively small. Furthermore, because the second magnetic conductive body 60 is in contact with the movable contact assembly 53, the magnetic attractive force between the second magnetic conductive body 60 and the third magnetic conductive body 55 becomes an internal force and does not affect the breaking of the movable contact piece 54. Therefore, the movable contact piece 54 only needs to overcome the relatively small magnetic attractive force between the first magnetic conductive body 40 and the third magnetic conductive body 55 to achieve breaking.

[0085] As described above, the first magnetic conductive body 40 and the second magnetic conductive body 60 in the embodiment of the present disclosure are offset from each other, and the magnetic attractive forces between them are not canceled out, allowing the thickness of the first magnetic conductive body 40 to be thin. Furthermore, as the thickness of the first magnetic conductive body 40 decreases, the magnetic attractive force generated between the first magnetic conductive body 40 and the third magnetic conductive body 55 also decreases. During the ultimate interruption process, when the second magnetic conductive body 60 contacts the movable contact piece 54 and the magnetic attractive force between the second magnetic conductive body 60 and the third magnetic conductive body 55 becomes an internal force, the magnetic attractive force of the first magnetic conductive body 40 that the movable contact piece 54 must resist also decreases, further helping to achieve interruption.

[0086] From the above, it can be seen that the first magnetic conductive body 40 is fixedly provided relative to the contact container 10, a fixed short-circuit resistant structure is formed between the first magnetic conductive body 40 and the third magnetic conductive body 55, the second magnetic conductive body 60 is fixedly connected to the support seat 52 of the push rod assembly 50, a follow-up short-circuit resistant structure is formed between the second magnetic conductive body 60 and the third magnetic conductive body 55, and the first magnetic conductive body 40 and the second magnetic conductive body 60 are arranged offset along the axial direction of the push rod 51, so that the relay of the embodiment of the present disclosure not only meets the requirements for short-circuit resistance and ultimate breaking, but also has the advantages of reducing costs and the size of the relay.

[0087] It is understood that when the movable contact assembly 53 is in a first position relative to the push rod assembly 50, the second magnetic conductive body 60 and the third magnetic conductive body 55 may be in direct contact or there may be a gap between them.

[0088] In this embodiment, the movable contact assembly 53 is in a first position relative to the push rod assembly 50, and the second magnetic conductive body 60 is in direct contact with the third magnetic conductive body 55. This causes most of the magnetic flux to flow in the magnetic circuit formed by the second magnetic conductive body 60 and the third magnetic conductive body 55, and a smaller portion of the magnetic flux to flow in the magnetic circuit formed by the first magnetic conductive body 40 and the third magnetic conductive body 55. Because the magnetic attraction force between the first magnetic conductive body 40 and the third magnetic conductive body 55 is relatively small, disconnection between the movable contact piece 54 and the fixed contact lead-out end 20 becomes more likely.

[0089] 5, 8, and 11, the second magnetic conductive body 60 includes a first magnetic conductive member 610 and a second magnetic conductive member 620. The first magnetic conductive member 610 and the second magnetic conductive member 620 are arranged side by side along the longitudinal direction D2 of the movable contact piece 54, and are located on two opposite side surfaces of the first magnetic conductive body 40, respectively.

[0090] The bracket 522 has an opening 525 formed therein, which is used to avoid the first magnetic conductive body 40 when the support seat 52 moves relative to the contact vessel 10 .

[0091] As an example, openings 525 are formed in top 523 of bracket 522 and at the connection between side 524 and top 523 .

[0092] As shown in Figures 4 and 5, the relay of the embodiment of the present disclosure further includes a connecting member 30, which is inserted into the second through-hole 103 and includes a first end 31 and a second end 32, where the first end 31 is connected to the contact container 10 and the second end 32 is connected to the first magnetic conductive body 40.

[0093] In the relay of the embodiment of the present disclosure, the first magnetic conductive body 40 is not directly connected to the contact container 10 but is connected to the contact container 10 via the connecting member 30, so that the connection process can be seen without being obstructed, which not only makes the operation convenient but also ensures the reliability of the connection. In one embodiment, the first magnetic conductive body 40 has a connection hole 411 , and the connection member 30 is inserted into the connection hole 411 .

[0094] Furthermore, the first through-hole 102 and the second through-hole 103 are both formed in the top wall 111 of the ceramic cover 11 , and the first end 31 of the connecting member 30 is connected to the outer wall surface of the top wall 111 .

[0095] On the outer wall surface of the top wall 111, a first metallization layer 113 is provided around the first through hole 102, and a second metallization layer 114 is provided around the second through hole 103. The fixed contact lead-out end 20 is welded to the top wall 111 via the first metallization layer 113, and the first end 31 of the connecting member 30 is welded to the top wall 111 via the second metallization layer 114.

[0096] Compared with the inner wall surface of ceramic cover 11, the outer wall surface of top wall 111 of ceramic cover 11 is easier to form a welding surface. Furthermore, fixed contact lead end 20 must be provided on top wall 111 of ceramic cover 11, and when welding fixed contact lead end 20 to top wall 111, a metallized layer must also be provided around first through hole 102. Therefore, when processing first metallized layer 113 for first through hole 102, second metallized layer 114 for second through hole 103 is also processed at the same time. Therefore, by welding connecting member 30 to the outer wall surface of top wall 111 of ceramic cover 11, a metallized layer can be processed only on the outer wall surface of top wall 111, without processing a metallized layer on the inner wall surface of top wall 111, which is convenient and simplifies the processing steps.

[0097] The first magnetic conductive body 40 is disposed at a distance from the inner wall surface of the top wall 111. By separating the first magnetic conductive body 40 from the inner wall surface of the top wall 111, a gap is formed between the first magnetic conductive body 40 and the inner wall surface of the top wall 111. Because the first magnetic conductive body 40 does not directly contact the inner wall surface of the top wall 111, the provision of the first magnetic conductive body 40 does not affect the creepage distance between the pair of fixed contact lead-out ends 20.

[0098] The top wall 111 and the side wall 112 are separate structures and are connected by welding.

[0099] It is understood that by designing the ceramic cover 11 as a separate structure with the top wall 111 and the side wall 112, it is more convenient to connect the connecting member 30 to the top wall 111. Of course, the top wall 111 and the side wall 112 may also be connected by adhesive.

[0100] Specifically, because the top wall 111 is sheet-shaped, the sheet-like structure facilitates the processing of the first through-hole 102, the second through-hole 103, the first metallization layer 113, and the second metallization layer 114 on the top wall 111. Furthermore, the sheet-like structure also facilitates the welding of the connection piece 30 to the top wall 111, and the welding of the fixed contact lead-out end 20 to the top wall 111.

[0101] Of course, the top wall 111 and the side wall 112 may be of an integral structure.

[0102] There are many different methods for connecting the second end 32 of the connection member 30 and the first magnetic conductive body 40, such as welding, caulking, or adhesive bonding.

[0103] Of course, in other embodiments, the method of fixedly providing the first magnetic conductive body 40 to the contact vessel 10 may be such that the first magnetic conductive body 40 is fixedly connected to a fixed frame in addition to the above-mentioned first magnetic conductive body 40 being fixedly connected to the ceramic cover 11. Specifically, the relay further includes a fixed frame disposed in the contact chamber 101 and fixedly connected to the yoke plate 13. The first magnetic conductive body 40 is fixedly connected to this fixed frame.

[0104] As shown in Figures 12 to 21, the similarities between the second embodiment and the first embodiment will not be repeated here, and the differences are as follows:

[0105] The first magnetic conductive body 40 has a perforation 41 that penetrates two opposing sides of the first magnetic conductive body 40 along the axial direction of the push rod 51, and the second magnetic conductive body 60 corresponds to the perforation 41 along the axial direction of the push rod 51.

[0106] It is understood that each example / embodiment provided in the present disclosure can be combined with each other without causing a contradiction, and they will not be described one by one here.

[0107] It is to be understood that the present disclosure is not limited in its application to the precise construction and arrangement of components set forth herein. The present disclosure is capable of other embodiments and can be realized and carried out in various ways. Such variations and modifications are within the scope of the present disclosure. The present disclosure as disclosed and limited herein will be understood to cover all alternative combinations of two or more individual features mentioned or apparent in the text and / or drawings. All these different combinations constitute multiple alternative aspects of the present disclosure. The embodiments described herein represent the best modes known for carrying out the present disclosure and will enable others skilled in the art to utilize the present disclosure.

Claims

1. a contact vessel having a contact chamber; a pair of fixed contact lead-out ends connected to the contact container, with at least a portion of each of the fixed contact lead-out ends located within the contact chamber; a first magnetic conductive body provided in the contact chamber and fixedly provided with respect to the contact vessel; a push rod assembly including a push rod and a second magnetic conductive body, the push rod being movable along an axial direction of the push rod relative to the contact container, the second magnetic conductive body being provided at one end of the push rod and offset from the first magnetic conductive body along the axial direction of the push rod; a movable contact assembly that is movable relative to the push rod assembly along the axial direction of the push rod between a first position close to the fixed contact pull-out end and a second position remote from the fixed contact pull-out end, the movable contact assembly including a movable contact piece and a third magnetic conductive body, the first magnetic conductive body and the second magnetic conductive body being disposed on a side of the movable contact piece facing the fixed contact pull-out end, the third magnetic conductive body being fixedly provided on a side of the movable contact piece facing away from the first magnetic conductive body and the second magnetic conductive body along the axial direction of the push rod, the third magnetic conductive body and the first magnetic conductive body forming a first magnetic conductive circuit, and the third magnetic conductive body and the second magnetic conductive body forming a second magnetic conductive circuit. A relay characterized by:

2. a resilient member that connects the movable contact assembly and the push rod assembly and applies a resilient force to the movable contact assembly to move it toward the first position; 2. The relay according to claim 1.

3. When the movable contact assembly is in the first position, a magnetic gap between the first magnetic body and the third magnetic body is larger than a magnetic gap between the second magnetic body and the third magnetic body.

2. The relay according to claim 1.

4. When the movable contact assembly is in the first position, the second magnetic conductive body and the third magnetic conductive body are in direct contact with each other.

4. The relay according to claim 3.

5. The push rod assembly further includes a support seat, the support seat being fixedly provided at one axial end of the push rod and extending at least partially into the contact chamber, the second magnetic conductive body being fixedly connected to the support seat, and the elastic member being provided between the movable contact assembly and the support seat.

3. The relay according to claim 2.

6. The support seat is a base connected to one end of the push rod, the elastic member being disposed between the base and the movable contact assembly; a bracket connected to the base, the second magnetic conductive body being connected to an inner wall surface of the bracket, and the movable contact piece and the third magnetic conductive body being movably provided in a space surrounded by the base and the bracket.

6. The relay according to claim 5.

7. The bracket is a top portion having an inner wall surface connected to the second magnetic conductive body; two side portions connected to either side of the top portion, each end of the two side portions remote from the top portion being connected to the base, and the two side portions, the top portion and the base together forming a space for the movable contact assembly to move; 7. The relay according to claim 6.

8. The first magnetic conductive body has perforations, the perforations penetrate two opposing side surfaces of the first magnetic conductive body along the axial direction of the push rod, and the positions of the second magnetic conductive body along the axial direction of the push rod correspond to the perforations.

2. The relay according to claim 1.

9. the second magnetic conductive body includes a first magnetic conductive member and a second magnetic conductive member, The first magnetic conductive member and the second magnetic conductive member are arranged side by side along the longitudinal direction of the movable contact piece, and are respectively located on two opposite sides of the first magnetic conductive member.

2. The relay according to claim 1.

10. the contact container further has a pair of first through holes and a second through hole, the first through hole and the second through hole both communicate with the contact chamber, and the pair of fixed contact lead-out ends are drilled into the pair of first through holes in a one-to-one correspondence; The relay further includes a connecting member, the connecting member being inserted into the second through-hole and having a first end and a second end, the first end being connected to the contact receptacle and the second end being connected to the first magnetic conductive body.

10. The relay according to claim 1, wherein the relay is a conductor.

11. The contact vessel includes a yoke plate and an insulating cover, the insulating cover includes a top wall and a side wall, one end of the side wall being connected around the top wall and the other end of the side wall being connected to the yoke plate; The first through hole and the second through hole are opened in the top wall, and a first end of the connecting member is connected to an outer wall surface of the top wall.

11. The relay according to claim 10.

12. the insulating cover includes a ceramic cover and a flange member, the ceramic cover includes the top wall and the side wall, and the other end of the side wall is connected to the yoke plate via the flange member; a first metallized layer is provided around the first through hole on an outer wall surface of the top wall, and a second metallized layer is provided around the second through hole; The fixed contact lead end is welded to the top wall through the first metallization layer, and the first end of the connecting member is welded to the top wall through the second metallization layer.

12. The relay according to claim 11 .

13. The top wall and the side wall are integrally formed, or the top wall and the side wall are separate structures and are connected by welding.

12. The relay according to claim 11 .

14. The first magnetic conductive body is disposed at a distance from the inner wall surface of the top wall.

12. The relay according to claim 11 .

15. the contact container includes a yoke plate and an insulating cover connected to the yoke plate; The relay further includes a fixed frame, the fixed frame being disposed within the contact chamber and fixedly connected to the yoke plate, and the first magnetic conductive body being fixedly connected to the fixed frame.

2. The relay according to claim 1.

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