Relay

Abstract

The present application relates to a relay, comprising a pair of static contacts and a plurality of moving contact members, wherein the pair of static contacts is arranged in a first direction, and each static contact has a plurality of static contact portions; each moving contact member has two moving contact portions, and the two moving contact portions are configured to be in contact with the static contact portions of the static contacts; respective orthographic projections, on a target plane, of a plurality of groups of corresponding moving contact portions and static contact portions between each static contact and the plurality of moving contact members have overlapping first projections, at least one of the plurality of first projections and the remaining first projections are arranged in a staggered manner in a third direction, and the orthographic projections of the plurality of moving contact members on the target plane have no overlapping area; and the moving direction of the plurality of moving contact members is defined as a second direction, the first direction, the second direction and the third direction are pairwise perpendicular to each other, and the target plane is perpendicular to the second direction.

Description

relay

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on February 7, 2024, with application number 202410174732.6 and application name “Relay”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of electric control devices, and in particular to a relay. Background Art

[0003] A relay is an electronic control device with a control circuit (also known as an input circuit) and a controlled system (also known as an output circuit). It is commonly used in automatic control circuits. A relay is essentially an "automatic switch" that uses a smaller current to control a larger one. Therefore, it plays a role in automatic regulation, safety protection, and circuit switching.

[0004] A high-voltage DC relay is a type of relay. Conventional high-voltage DC relays consist of an insulating cover, a stationary contact, and a moving contact. The stationary contact is mounted on the insulating cover. The closing and opening of the relay contacts are achieved through the contact and separation between the stationary contact and the moving contact. When the relay interrupts a heavy load, an extremely high-energy arc is generated between the stationary contact and the moving contact. This arc can easily erode the moving and stationary contacts, making them unable to meet the high voltage and high current load requirements.

[0005] Based on this, conventional technology has proposed a technical solution of arranging an arc-extinguishing permanent magnet on the outer surface of the insulating cover. However, the arc-extinguishing performance of the relay in conventional technology needs to be further improved. Summary of the Invention

[0006] According to various embodiments of the present application, a relay capable of improving the arc extinguishing performance of the relay is provided.

[0007] The relay of the embodiment of the present application includes:

[0008] a pair of stationary contacts arranged along a first direction, each of the stationary contacts having a plurality of stationary contact portions;

[0009] A plurality of movable contact pieces, each of the movable contact pieces having two movable contact portions, the two movable contact portions being used to contact the static contact portion of the static contact; a plurality of corresponding groups of movable contact portions and static contact portions between each static contact and the plurality of movable contact pieces having overlapping first projections on a target plane, and at least one of the plurality of first projections being staggered with the remaining first projections.

[0010] In one embodiment, there is no overlapping area between the orthographic projections of the plurality of movable contact pieces on the target plane.

[0011] In one embodiment, at least one of the plurality of first projections is staggered with the other first projections in a third direction;

[0012] The movement directions of the plurality of movable contact pieces are defined as a second direction, the first direction, the second direction and the third direction are perpendicular to each other, and the target plane is perpendicular to the second direction.

[0013] In one embodiment, a moving contact portion is formed at each of the two ends of the length direction of each moving contact piece;

[0014] The length of at least one of the movable contact pieces is greater than the lengths of the remaining movable contact pieces.

[0015] In one embodiment, both ends of the movable contact piece with a relatively larger length extend beyond the rest of the movable contact pieces in the first direction.

[0016] In one embodiment, the number of the movable contact pieces is three, and the three movable contact pieces are arranged along the third direction; each of the static contacts has three static contact points;

[0017] The length of the middle movable contact piece is greater than the lengths of the other two movable contact pieces.

[0018] In one embodiment, the other two movable contact pieces are equal in length.

[0019] In one embodiment, a contact gap between at least one of the plurality of movable contact pieces and the stationary contact is smaller than contact gaps between the remaining movable contact pieces and the stationary contact.

[0020] In one embodiment, a moving contact portion is formed at each of the two ends of the length direction of each moving contact piece;

[0021] The length of one of the movable contact pieces is greater than the lengths of the other movable contact pieces, and the contact gap between the movable contact piece with the longer length and the static contact is smaller.

[0022] In one embodiment, the number of the movable contact pieces is three, and the three movable contact pieces are arranged along the third direction; each of the static contacts has three static contact points;

[0023] The length of the middle movable contact piece is greater than that of the other two movable contact pieces, and the lengths of the other two movable contact pieces are equal.

[0024] In one embodiment, it further includes:

[0025] The anti-short circuit structure is used to form a suction force on at least one of the movable contact pieces in the direction of contact closing; wherein the suction force on the movable contact piece with a smaller contact gap is smaller than the suction force on the other movable contact pieces.

[0026] In one embodiment, the anti-short circuit structure includes:

[0027] a first magnetic conductor, provided on a side of the plurality of movable contact pieces facing the stationary contact; the first magnetic conductor and the respective orthographic projection of each movable contact piece on the target plane having a third overlapping projection; and

[0028] At least one second magnetic conductor, and among the multiple moving contact pieces, except for the moving contact piece with a smaller contact gap, the other moving contact pieces are fixedly connected to a second magnetic conductor on the side facing away from the static contact, and the first magnetic conductor is used to form a magnetic circuit with at least one second magnetic conductor.

[0029] In one embodiment, the anti-short circuit structure includes:

[0030] At least one first magnetic conductor is provided on a side of the plurality of movable contact pieces facing the stationary contact; along the contact closing direction, the number and position of the at least one first magnetic conductor respectively correspond to the number and position of the remaining movable contact pieces; and

[0031] At least one second magnetic conductor, and among the multiple moving contact pieces, except for the moving contact piece with a smaller contact gap, the other moving contact pieces are fixedly connected to a second magnetic conductor on the side facing away from the static contact, and the corresponding first magnetic conductors and the second magnetic conductors are used to form a magnetic circuit.

[0032] In one embodiment, the suction force on the movable contact piece with a smaller contact gap is zero.

[0033] In one embodiment, the anti-short circuit structure includes:

[0034] At least one first magnetic conductor is provided. Among the plurality of movable contact pieces, except for the movable contact piece with a smaller contact gap, the other movable contact pieces are each provided with a first magnetic conductor on a side facing the static contact.

[0035] In one embodiment, the anti-short circuit structure includes:

[0036] a first magnetic conductor, provided on a side of the plurality of movable contact pieces facing the stationary contact; the first magnetic conductor and the respective orthographic projection of each movable contact piece on the target plane having a third overlapping projection; and

[0037] Multiple second magnetic conductors, each of the movable contact pieces is fixedly connected to a second magnetic conductor on the side facing away from the static contact, and the first magnetic conductor and the second magnetic conductor are used to form a magnetic circuit; the thickness of the second magnetic conductor corresponding to the movable contact piece with a smaller contact gap is smaller than the thickness of the second magnetic conductor corresponding to the remaining movable contact pieces.

[0038] In one embodiment, the relay further comprises an insulating cover, the insulating cover having an inner cavity, and the insulating cover further having a pair of mounting holes communicating with the inner cavity;

[0039] Each of the static contacts comprises an extension portion, a connecting portion and a contact portion, wherein the extension portion is connected to the contact portion via the connecting portion, and the two connecting portions are respectively provided in a pair of mounting holes, the extension portion is located on the outer surface of the insulating cover and is connected to the insulating cover; the contact portion is located in the inner cavity and has a plurality of static contact portions;

[0040] At least a portion of at least one stationary contact portion of each stationary contact protrudes from an outer circumferential surface of the connecting portion.

[0041] In one embodiment, the plurality of static contact portions of each static contact include a first static contact portion and a second static contact portion; along the first direction, at least portions of the two first static contact portions of the two static contacts extend away from each other from the outer peripheral surface of the corresponding connecting portion;

[0042] At least a portion of the second static contact portion of each static contact extends beyond the outer circumferential surface of the connecting portion, and an angle is formed between an extending direction of the second static contact portion and an extending direction of the first static contact portion.

[0043] In one embodiment, a first permanent magnet is provided at a position on the outer surface of the insulating cover corresponding to the first static contact portion, and a second permanent magnet is provided at a position on the outer surface of the insulating cover corresponding to the second static contact portion;

[0044] The polarity of a side surface of the first permanent magnet facing the insulating cover is opposite to the polarity of a side surface of the second permanent magnet facing the insulating cover.

[0045] In one embodiment, at least a portion of the second static contact portion extends out from the outer circumferential surface of the connecting portion along the third direction.

[0046] In one embodiment, the plurality of static contact portions of each static contact further includes a third static contact portion;

[0047] Along the third direction, at least a portion of the second stationary contact portion and at least a portion of the third stationary contact portion of each stationary contact protrude from the outer circumferential surface of the connecting portion in directions away from each other.

[0048] In one embodiment, a first permanent magnet is provided on the outer surface of the insulating cover at a position corresponding to the first static contact portion, a second permanent magnet is provided at a position corresponding to the second static contact portion, and a third permanent magnet is provided at a position corresponding to the third static contact portion;

[0049] The polarity of the second permanent magnet's surface facing the insulating cover is the same as the polarity of the third permanent magnet's surface facing the insulating cover, and opposite to the polarity of the first permanent magnet's surface facing the insulating cover.

[0050] In one embodiment, the protruding portion and the connecting portion are an integral structure, and the contact portion and the connecting portion are separate structures.

[0051] In one embodiment, the protruding portion and the connecting portion are made of a first material, and the contact portion is made of a second material, and the first material is different from the second material.

[0052] In one embodiment, at least a portion of at least one of the static contact portions of each of the static contacts extends beyond the outer circumference of the extending portion.

[0053] In the relay of the embodiment of the present application, the orthographic projections of the multiple groups of corresponding moving contact parts and static contact parts between each static contact and the multiple moving contact pieces on a target plane have overlapping first projections, and at least one first projection among the multiple first projections is staggered in the third direction with the remaining first projections, so that the arc starting points formed between the multiple static contact parts and the multiple moving contact pieces are staggered in the third direction, thereby increasing the distance between the arc starting points, avoiding the arcs formed by the multiple arc starting points from gathering and affecting each other, which is beneficial to improving the arc extinguishing performance.

[0054] Furthermore, the length of the middle moving contact piece is greater than the length of the other moving contact pieces, and the contact gap between the middle moving contact piece and the static contact is smaller, so that the arc is only generated at the two ends of the middle moving contact piece, and no arc is generated at the other moving contact pieces, so that the arc generated at the two ends of the middle moving contact piece can be drawn out from the space where the middle moving contact piece exceeds the other moving contact pieces, and the direction of the arc drawing out avoids the other moving contact pieces and the static contact parts corresponding to the other moving contact pieces, thereby avoiding the arc burning the other moving contact pieces.

[0055] Furthermore, the relay in the embodiment of the present application also includes an anti-short-circuit structure, which is combined with the design that the contact gap between at least one of the multiple moving contact pieces and the static contact is smaller than the contact gap between the remaining moving contact pieces and the static contacts. This is conducive to achieving extreme disconnection between contacts and can also achieve delayed disconnection of contacts during short circuit, thereby ensuring the reliability of the relay operation and extending the service life of the product.

[0056] Furthermore, at least a portion of at least one static contact portion of each static contact extends out from the outer peripheral surface of the connecting portion, so that the contact position between the moving contact piece and the static contact is close to the insulating cover, that is, the arc starting point is closer to the insulating cover, which can quickly cool the arc and is beneficial to improving the arc extinguishing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to better describe and illustrate the embodiments and / or examples of the present application, reference may be made to one or more of the accompanying drawings. The additional details or examples used to describe the accompanying drawings should not be considered as limiting the scope of the disclosed application, the presently described embodiments and / or examples, and any of the best modes currently understood for these applications.

[0058] FIG1 is a perspective schematic diagram of a relay according to an embodiment of the present application.

[0059] FIG2 is a schematic side view of a relay according to an embodiment of the present application.

[0060] FIG. 3 shows a cross-sectional view along the AA cutting line in FIG. 1 .

[0061] FIG4 shows a perspective schematic diagram of a static contact.

[0062] FIG5 shows an exploded schematic diagram of the static contact.

[0063] FIG6 shows a three-dimensional schematic diagram of three moving contact pieces.

[0064] FIG7 is a perspective schematic diagram showing a stationary contact, a movable contact piece, a first magnetic conductor and a second magnetic conductor.

[0065] FIG. 8 shows a cross-sectional view along the BB section line in FIG. 2 .

[0066] 9 and 10 are schematic diagrams showing two arc blowing directions.

[0067] FIG11 shows a partial schematic diagram when none of the three moving contact pieces are in contact with the stationary contacts.

[0068] FIG12 is a partial schematic diagram showing a situation in which the middle movable contact piece among the three movable contact pieces is in contact with the stationary contact, while the other two movable contact pieces are not in contact with the stationary contact.

[0069] FIG13 shows a partial schematic diagram when the three moving contact pieces are in contact with the stationary contacts.

[0070] FIG14 is a schematic diagram showing a short-circuit-proof structure.

[0071] 15 to 17 are schematic diagrams showing an anti-short circuit structure and a plurality of movable contact pieces according to three different embodiments.

[0072] Explanation of Reference Numerals: 21, insulating cover; 211, mounting hole; 212, inner cavity; 213, top wall; 214, cylindrical side wall; 215, first side wall; 216, second side wall; 22, static contact; 221, extension portion; 222, connecting portion; 223, contact portion; 2231, static contact portion; 2231a, first static contact portion; 2231b, second static contact portion; 2231c, third static contact portion; 2232, base portion; 24, frame piece; 25, yoke plate; 251, first through-hole; 26, arc-extinguishing portion; 261, yoke clamp; 262, permanent magnet; 262a, first permanent magnet; 262b, second permanent magnet; 262c, third permanent magnet; 27, metal cover; 30. Moving assembly; 31. Moving contact piece; 31a. First moving contact piece; 31b. Second moving contact piece; 31c. Third moving contact piece; 311. Moving contact portion; 32. First elastic member; 33. Push rod member; 40. Magnetic circuit portion; 41. Moving iron core; 42. Stationary iron core; 421. Second through-hole; 43. Coil frame; 44. Coil; 45. Magnetic cylinder; 46. Second elastic member; 47. U-shaped yoke; 471. Bottom yoke plate; 472. Side yoke plate; 50. Anti-short-circuit structure; 51. First magnetic conductor; 52. Second magnetic conductor; 53. Connector; D1. First direction; D2. Second direction; D3. Third direction. DETAILED DESCRIPTION

[0073] To facilitate understanding of the present application, a more comprehensive description of the present application will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. It should be understood that these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present application.

[0074] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0075] It is understood that the terms "including" and "having" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to the process, method, product, or apparatus.

[0076] In addition, the following will disclose embodiments of the present invention with reference to the accompanying drawings. For the purpose of clarity, many practical details will be described in the following description. However, it should be understood that these practical details are not intended to limit the present invention.

[0077] Furthermore, for the sake of clutter, some conventional structures and components may be depicted in simplified schematic form in the drawings. Furthermore, some features in the drawings may be slightly enlarged or their proportions or dimensions altered to facilitate understanding and appreciation of the technical features of the present invention, but this is not intended to limit the present invention. The actual dimensions and specifications of products manufactured in accordance with the disclosure of this invention may be adjusted based on production requirements, product characteristics, and the following disclosures of this invention. This is hereby stated.

[0078] As shown in FIG. 1 to FIG. 3 , the relay according to the embodiment of the present application includes an insulating cover 21 , a yoke plate 25 , a pair of static contacts 22 , an arc extinguishing portion 26 , a moving assembly 30 and a magnetic circuit portion 40 .

[0079] The insulating cover 21 has an inner cavity 212. A pair of static contacts 22 are mounted on the top of the insulating cover 21. At least a portion of each static contact 22 extends into the inner cavity 212 of the insulating cover 21. Each static contact 22 also has a static contact point at its bottom. The static contact point can be integrally or separately disposed at the bottom of the static contact 22. One static contact 22 serves as a terminal for current inflow, while the other static contact 22 serves as a terminal for current outflow.

[0080] In one embodiment, the top of the insulating cover 21 defines two mounting holes 211, each of which communicates with the inner cavity 212. A pair of static contacts 22 are respectively disposed within the two mounting holes 211. Furthermore, each static contact 22 may be connected to the insulating cover 21 by welding, but the present invention is not limited thereto.

[0081] It is understandable that the insulating cover 21 may be made of ceramic material, that is, the insulating cover 21 is a ceramic cover, but is not limited thereto. For example, in other embodiments, the insulating cover 21 may also be made of plastic material.

[0082] In one embodiment, the insulating cover 21 is made of ceramic material, and the insulating cover 21 is connected to the yoke iron plate 25 through a frame piece 24. The frame piece 24 can be a metal piece with an annular structure, such as an iron-nickel alloy. One end of the frame piece 24 is connected to the opening edge of the insulating cover 21, for example, by laser welding, brazing, resistance welding, gluing, etc. The other end of the frame piece 24 is connected to the yoke iron plate 25, which can also be done by laser welding, brazing, resistance welding, gluing, etc. A frame piece 24 is provided between the insulating cover 21 and the yoke iron plate 25 to facilitate the connection between the insulating cover 21 and the yoke iron plate 25.

[0083] Continuing to refer to FIG. 3 , the movable assembly 30 includes a movable contact piece 31 , a first elastic member 32 and a push rod member 33 .

[0084] For ease of explanation, the arrangement direction of the pair of static contacts 22 is defined as the first direction D1, and the movement direction of the movable contact piece 31 is defined as the second direction D2, wherein the first direction D1 is perpendicular to the second direction D2. A direction perpendicular to both the first direction D1 and the second direction D2 is defined as the third direction D3.

[0085] The movable contact piece 31 is disposed in the insulating cover 21 , and two ends of the movable contact piece 31 along the first direction D1 are respectively used to contact or separate from the bottoms of the pair of stationary contacts 22 .

[0086] The push rod member 33 is movably provided in the first through hole 251 of the yoke plate 25, and part of the push rod member 33 extends out of the side surface of the yoke plate 25 facing the static contact 22, and part of the push rod member 33 extends out of the side surface of the yoke plate 25 facing away from the static contact 22.

[0087] The movable contact piece 31 is movably mounted on the portion of the push rod member 33 that extends from the side of the yoke plate 25 facing the stationary contact 22. A first elastic member 32 is connected to the push rod member 33 and the movable contact piece 31 and is used to apply an elastic force to the movable contact piece 31 toward the stationary contact 22 to provide contact pressure.

[0088] As an example, the first elastic member 32 is a spring or a leaf spring, but is not limited thereto. Furthermore, the number of the first elastic member 32 may be one or more. When there are multiple first elastic members 32, the multiple first elastic members 32 may all be springs, or all be leaf springs, or a combination of leaf springs and springs, and this application does not impose any particular limitation thereto.

[0089] A metal cover 27 is further provided on the side of the yoke plate 25 facing away from the static contact 22. The metal cover 27 covers the first through-hole 251 of the yoke plate 25. The portion of the push rod member 33 extending from the side of the yoke plate 25 facing away from the static contact 22 is inserted into the metal cover 27.

[0090] Continuing with Figure 3, the magnetic circuit 40 includes a moving iron core 41, a stationary iron core 42, a coil bobbin 43, and a coil 44. The coil bobbin 43 is hollow and cylindrical and made of insulating material. It is located on the side of the yoke plate 25 facing away from the stationary contact 22 and surrounds the outer circumference of the metal cover 27. The coil 44 is wound around the outer circumference of the coil bobbin 43.

[0091] The static iron core 42 is fixedly disposed in the metal cover 27, and a portion of the static iron core 42 is inserted into the first through-hole 251. The static iron core 42 has a second through-hole 421, and the second through-hole 421 corresponds to the position of the first through-hole 251, so that the push rod member 33 can be movably penetrated in the first through-hole 251 and the second through-hole 421. The moving iron core 41 is movably disposed in the metal cover 27 and is arranged relative to the static iron core 42 in the second direction D2. The moving iron core 41 is connected to the push rod member 33 and is used to be attracted by the static iron core 42 when the coil 44 is energized. The moving iron core 41 and the push rod member 33 can be connected by screwing, riveting, welding or other methods.

[0092] As shown in FIG3 , the magnetic circuit portion 40 further includes a second elastic member 46 . The second elastic member 46 is located in the metal cover 27 and disposed between the static iron core 42 and the movable iron core 41 . The second elastic member 46 is used to reset the movable iron core 41 when the coil 44 is de-energized.

[0093] In one embodiment, the second elastic member 46 is a spring and is sleeved on the outer circumference of the push rod member 33 , but the present invention is not limited thereto.

[0094] It should be noted that when the coil 44 is energized, the stationary iron core 42 attracts the movable iron core 41 to move upward, and the movable iron core 41 drives the push rod member 33 upward. When the movable contact piece 31 contacts the stationary contact 22, the movable contact piece 31 is stopped by the stationary contact 22, while the push rod member 33 continues to move upward until the overtravel is completed.

[0095] During the overtravel process, the first elastic member 32 is squeezed by the push rod member 33 and can provide elastic force to the movable contact piece 31 to provide contact pressure.

[0096] As shown in Figures 2 and 3, the magnetic circuit portion 40 also includes a U-shaped yoke 47 and a magnetic tube 45. The U-shaped yoke 47 includes a bottom yoke plate 471 and two side yoke plates 472. The two side yoke plates 472 are respectively connected to the two ends of the bottom yoke plate 471 along the first direction D1, and the two side yoke plates 472 are arranged opposite each other along the first direction D1. The bottom yoke plate 471 is located on the side of the coil frame 43 facing away from the static contact 22. The two side yoke plates 472 are respectively connected to the two ends of the yoke plate 25 along the first direction D1 at their ends away from the bottom yoke plate 471. The coil 44, coil frame 43, metal cover 27, and movable iron core 41 are accommodated in the space enclosed by the yoke plate 25 and the bottom yoke plate 471 and the two side yoke plates 472 of the U-shaped yoke 47. The magnetic tube 45 is sleeved around the outer periphery of the metal cover 27 and is located between the metal cover 27 and the coil frame 43.

[0097] As shown in Figure 3, the arc-extinguishing portion 26 includes a permanent magnet 262, which is disposed on the outer side of the insulating cover 21. By disposing the permanent magnet 262 on the outer periphery of the insulating cover 21, a magnetic field is generated around the stationary contact 22 and the movable contact piece 31. Consequently, the arc generated between the stationary contact 22 and the movable contact piece 31 is stretched away from each other by the magnetic field, thereby extinguishing the arc.

[0098] The arc extinguishing portion 26 further includes a yoke clamp 261, and a permanent magnet 262 is disposed between a surface of the yoke clamp 261 facing the insulating cover 21 and the outer peripheral surface of the insulating cover 21. The design of the yoke clamp 261 surrounding the permanent magnet 262 prevents the magnetic field generated by the permanent magnet 262 from spreading outward and affecting the arc extinguishing effect.

[0099] In one embodiment, the yoke clip 261 is made of a soft magnetic material, which may include but is not limited to iron, cobalt, nickel, and alloys thereof.

[0100] It is understood that the number of yoke clips 261 can be one or two. When there is one yoke clip 261, the yoke clip 261 forms an annular structure that surrounds the outer circumference of the insulating cover 21. When there are two yoke clips 261, each yoke clip 261 can be U-shaped and arranged opposite each other along the first direction D1, with the two yoke clips 261 respectively surrounding the two ends of the insulating cover 21 along the first direction D1.

[0101] As shown in Figures 4 and 5, each static contact 22 has an extension portion 221, a connection portion 222, and a contact portion 223. The extension portion 221 and the contact portion 223 are connected by the connection portion 222. The two connection portions 222 of the two static contacts 22 are respectively inserted into a pair of mounting holes 211. The extension portion 221 is located on the outer surface of the insulating cover 21 and is connected to the insulating cover 21. The contact portion 223 is located in the inner cavity 212 and has a static contact portion 2231.

[0102] In one embodiment, the extension portion 221 and the connecting portion 222 are integrally formed, while the contact portion 223 and the connecting portion 222 are separate structures. The separate structures of the contact portion 223 and the connecting portion 222 can reduce the difficulty of manufacturing the static contact 22 and thus reduce costs.

[0103] Furthermore, the protruding portion 221 and the connecting portion 222 are made of a first material, and the contact portion 223 is made of a second material, and the first material is different from the second material.

[0104] It should be noted that the extension portion 221 of the static contact 22 is used to electrically connect to the copper busbar, and the contact portion 223 of the static contact 22 is used to contact the moving contact piece 31. Therefore, the extension portion 221 needs to be made of a material with high conductivity, and the contact portion 223 needs to be made of an anti-adhesion material.

[0105] In one embodiment, by designing the extension portion 221 and the contact portion 223 as separate structures, the extension portion 221 can be made of a first material with high conductivity, such as oxygen-free copper, while the contact portion 223 can be made of a second material with anti-adhesion properties, such as a copper alloy. Of course, the first material and the second material are not limited to oxygen-free copper and copper alloy.

[0106] In addition, the connection method between the connecting portion 222 and the contact portion 223 can be welding, riveting, interference fit, etc., which is not particularly limited in this application.

[0107] It will be appreciated that the connecting portion 222 of the embodiment of the present application is cylindrical, the extension portion 221 is connected to one axial end of the connecting portion 222, and the contact portion 223 is connected to the other axial end of the connecting portion 222. The extension portion 221 is generally disc-shaped, with the axis of the extension portion 221 coinciding with the axis of the connecting portion 222. The diameter of the extension portion 221 is greater than the diameter of the connecting portion 222. Of course, in other embodiments, the static contact 22 can also be designed with other regular or irregular shapes, which is not limited in this application.

[0108] In one embodiment, the contact portion 223 further includes a base 2232 connected to the connecting portion 222, and the static contact portion 2231 is connected to the base 2232. As an example, the base 2232 may be disc-shaped, and the static contact portion 2231 is protruded from the outer circumference of the base 2232.

[0109] It is understandable that the number of the static contact portion 2231 included in the contact portion 223 may be one or more.

[0110] As shown in Figure 6, the movable contact piece 31 has movable contact portions 311 corresponding to the stationary contact portions 2231. The contact and separation directions of the corresponding movable contact portions 311 and the stationary contact portions 2231 are perpendicular to the yoke plate 25. A movable contact portion 311 is formed at each end of the movable contact piece 31 in the longitudinal direction (i.e., the first direction D1). The two stationary contact portions 2231 on different stationary contacts 22 correspond to the two movable contact portions 311 of a movable contact piece 31.

[0111] Of course, in other embodiments, the movable contact portion 311 may not be disposed at the end of the movable contact piece 31 in the longitudinal direction. The movable contact portion 311 may also be disposed at other positions of the movable contact piece 31, for example, near the end of the movable contact piece 31.

[0112] It should be noted that the movable assembly 30 may include one or more movable contact pieces 31. When there are multiple movable contact pieces 31, the multiple movable contact pieces 31 may be arranged side by side along the third direction D3, and the movable contact portions 311 at both ends of each movable contact piece 31 along the first direction D1 are used to respectively contact or separate with a pair of stationary contacts 22.

[0113] The movable contact portions 311 at both ends of the multiple movable contact pieces 31 along the first direction D1 contact a pair of stationary contacts 22, forming a reliable parallel circuit. The number of contact points formed by the multiple movable contact pieces 31 and a single stationary contact 22 is greater than or equal to two, achieving a current splitting effect. Furthermore, based on the principle that the magnitude of the electrodynamic repulsive force is proportional to the square of the current, the magnitude of the electrodynamic repulsive force at each contact point is significantly reduced, which helps improve short-circuit resistance and enhances the reliability of the relay.

[0114] It is understood that the number of movable contact pieces 31 corresponds to the number of stationary contact portions 2231 included in one stationary contact 22. For example, when there is one movable contact piece 31, the contact portion 223 of each stationary contact 22 has one stationary contact portion 2231; when there are two movable contact pieces 31, the contact portion 223 of each stationary contact 22 has two stationary contact portions 2231; when there are three movable contact pieces 31, the contact portion 223 of each stationary contact 22 has three stationary contact portions 2231; and so on, which are not listed here one by one.

[0115] Of course, in other embodiments, the movable contact piece 31 may also be in contact with the plurality of stationary contact points 2231 of the stationary contact 22 .

[0116] Next, an example is given in which the number of the movable contact pieces 31 is three and the contact portion 223 of each stationary contact 22 has three stationary contact points 2231 .

[0117] As shown in Figures 7 and 8, the orthographic projections of the movable contact portion 311 and the static contact portion 2231 corresponding to the movable contact piece 31 and the static contact head 22 on a target plane have overlapping first projections, and the orthographic projection of the connecting portion 222 on the target plane is the second projection, and at least part of the first projection falls outside the second projection; wherein the target plane is perpendicular to the movement direction (second direction D2) of the movable contact piece 31.

[0118] In the relay of the embodiment of the present application, the moving contact portion 311 and the static contact portion 2231 have an overlapping first projection on the target plane, and the connecting portion 222 of the static contact 22 has a second projection on the target plane. At least part of the first projection falls outside the second projection, so that the contact position between the moving contact piece 31 and the static contact 22 is close to the insulating cover 21, that is, the arc starting point is closer to the insulating cover 21, which can play a role in quickly cooling the arc and is beneficial to improving the arc extinguishing performance.

[0119] In addition, when there are multiple moving contact pieces 31, since at least part of the first projection falls outside the second projection, the distance between two adjacent moving contact pieces 31 in the third direction D3 can be increased, so that the adjacent moving contact pieces 31 are not affected, and the distance between two adjacent anti-short-circuit structures in the third direction D3 can also be increased, so that the magnetic fields between adjacent anti-short-circuit structures will not interfere.

[0120] It is understood that the three static contact portions 2231 included in the static contact 22 of the embodiment of the present application each have a first projection on the target plane with the corresponding movable contact piece 31. In one embodiment, the entirety of each first projection may be located outside the second projection; in another embodiment, a portion of each first projection may be located outside the second projection, while another portion of the first projection is located within the second projection; in yet another embodiment, of the three first projections, the entirety of one or two first projections is located outside the second projection, while portions of the remaining first projections are located outside the second projection.

[0121] In one embodiment, a portion of one of the first projections is located outside the second projection, and all of the other two first projections are located outside the second projection.

[0122] Of course, it is understandable that at least part of the first projection is not only outside the second projection, but also outside the fourth projection, where the fourth projection is the orthographic projection of the extension 221 of the static contact 22 in the target plane.

[0123] As shown in Figures 3 and 8, the insulating cover 21 includes a top wall 213 and a cylindrical side wall 214. The top wall 213 has a mounting hole 211. The extension 221 is located on the outer wall surface of the top wall 213 and is connected to the outer wall surface of the top wall 213, for example, by welding. The cylindrical side wall 214 is connected to the outer periphery of the top wall 213, and the top wall 213 and the cylindrical side wall 214 enclose an inner cavity 212. At least a portion of the static contact portion 2231 extends from the outer periphery of the connecting portion 222 toward the cylindrical side wall 214. A permanent magnet is provided on the outer wall surface of the cylindrical side wall 214 at a position corresponding to the static contact portion 2231.

[0124] It is understandable that the shape of the cylindrical side wall 214 can be a circular cylindrical structure, a rectangular cylindrical structure, or other regular or irregular shapes, and this application does not specifically limit this.

[0125] In one embodiment, the static contact portion 2231 extends from the outer peripheral surface of the connecting portion 222 toward the permanent magnet, so that the arc starting point is closer to the permanent magnet. The magnetic field strength at the position close to the permanent magnet is stronger, and the stronger magnetic field can improve the arc extinguishing performance.

[0126] It should be noted that, as shown in Figure 8, the cylindrical side wall 214 can be divided into two semi-annular structures in the first direction D1. The two semi-annular structures correspond to the two static contacts 22, and each semi-annular structure partially surrounds the corresponding static contact 22. Then, at least part of the static contact portion 2231 of the static contact 22 is moving toward the direction close to the cylindrical side wall 214. It should be understood that at least part of the static contact portion 2231 of the static contact 22 is approaching the semi-annular structure that partially surrounds the static contact 22.

[0127] For convenience of explanation, the three static contact portions 2231 of the contact portion 223 of each static contact 22 are defined as the first static contact portion 2231a, the second static contact portion 2231b and the third static contact portion 2231c, and the three dynamic contact pieces 31 are defined as the first dynamic contact piece 31a, the second dynamic contact piece 31b and the third dynamic contact piece 31c.

[0128] As shown in FIG6 , the first movable contact piece 31 a , the second movable contact piece 31 b and the third movable contact piece 31 c are arranged along the third direction D3 , and the first movable contact piece 31 a is located between the second movable contact piece 31 b and the third movable contact piece 31 c .

[0129] In one embodiment, the length of the first movable contact piece 31a is greater than the length of the second movable contact piece 31b and the length of the third movable contact piece 31c. The second movable contact piece 31b and the third movable contact piece 31c may be of equal length or of different length.

[0130] In one embodiment, the second movable contact piece 31 b and the third movable contact piece 31 c are of the same length and are shorter than the first movable contact piece 31 a , but not limited thereto.

[0131] As shown in Figures 7 and 8, the orthographic projections of the multiple groups of corresponding moving contact parts 311 and static contact parts 2231 between each static contact 22 and the multiple moving contact pieces 31 on a target plane have overlapping first projections, and at least one first projection among the multiple first projections is staggered with the other first projections.

[0132] For explanation, the "offset arrangement" in the above embodiment means that at least one first projection among multiple first projections is staggered with the remaining first projections along a certain direction (hereinafter referred to as the direction), that is, the first projections are arranged along the direction, and at least one first projection and the remaining first projections are not on a straight line in the direction.

[0133] As shown in Figures 7 and 8, the orthographic projections of the multiple groups of corresponding moving contact parts 311 and static contact parts 2231 between each static contact 22 and the multiple moving contact pieces 31 on a target plane have overlapping first projections, at least one first projection among the multiple first projections is staggered with the remaining first projections in the third direction D3, and there is no overlapping area between the orthographic projections of the multiple moving contact pieces 31 on the target plane.

[0134] In one embodiment, the orthographic projections of the multiple groups of corresponding moving contact portions 311 and static contact portions 2231 between each static contact 22 and the multiple moving contact pieces 31 on a target plane have overlapping first projections, and at least one first projection among the multiple first projections is staggered with the remaining first projections in the third direction D3, so that the arc starting points formed between the multiple static contact portions 2231 and the multiple moving contact pieces 31 are staggered in the third direction D3, thereby increasing the distance between the arc starting points, avoiding the arcs formed by the multiple arc starting points from gathering and affecting each other, which is beneficial to improving the arc extinguishing performance.

[0135] For further explanation, in the above embodiment, “displaced in the third direction D3” means that the first projections are arranged along the third direction D3, and at least one first projection and the other first projections are not on a straight line where the third direction D3 is located.

[0136] As shown in Figure 8 , at least a portion of at least one stationary contact portion 2231 in each stationary contact 22 extends beyond the outer circumference of the connecting portion 222. In one embodiment, along a first direction D1, at least portions of the two first stationary contact portions 2231a of the two stationary contacts 22 extend away from each other from the outer circumference of their respective connecting portions 222. At least a portion of the second stationary contact portion 2231b of each stationary contact 22 extends beyond the outer circumference of the connecting portion 222, and a first angle is formed between the extension direction of the second stationary contact portion 2231b and the extension direction of the first stationary contact portion 2231a. At least a portion of the third stationary contact portion 2231c of each stationary contact 22 extends beyond the outer circumference of the connecting portion 222, and a second angle is formed between the extension direction of the third stationary contact portion 2231c and the extension direction of the first stationary contact portion 2231a. The first angle is greater than 0° and less than or equal to 90°, and the second angle is greater than 0° and less than or equal to 90°.

[0137] In one embodiment, the extending direction of the second static contact portion 2231b is 90 degrees to the extending direction of the first static contact portion 2231a, and the extending direction of the third static contact portion 2231c is 90 degrees to the extending direction of the first static contact portion 2231a.

[0138] Furthermore, along the third direction D3 , at least a portion of the second static contact portion 2231 b and at least a portion of the third static contact portion 2231 c of each static contact 22 extend out from the outer circumferential surface of the connecting portion 222 in directions away from each other.

[0139] A first permanent magnet 262a is provided on the outer surface of the insulating cover 21 at a position corresponding to the first static contact portion 2231a, a second permanent magnet 262b is provided at a position corresponding to the second static contact portion 2231b, and a third permanent magnet 262c is provided at a position corresponding to the third static contact portion 2231c. The two first permanent magnets 262a corresponding to the two first static contact portions 2231a are spaced apart in the first direction D1, and are located on opposite sides of the two first static contact portions 2231a in the first direction D1. The polarity of the second permanent magnet 262b on the side facing the insulating cover 21 is the same as the polarity of the third permanent magnet 262c on the side facing the insulating cover 21, and is opposite to the polarity of the first permanent magnet 262a on the side facing the insulating cover 21.

[0140] It is understood that at least a portion of at least one static contact portion 2231 of each static contact 22 extends beyond the outer circumference of the extending portion 222.

[0141] The cylindrical sidewall 214 of the insulating cover 21 includes two first sidewalls 215 spaced apart along the first direction D1 and two second sidewalls 216 spaced apart along the third direction D3 . The second sidewall 216 is connected to the two first sidewalls 215 at both ends along the first direction D1 .

[0142] In the first direction D1, a first permanent magnet 262a is provided at a position on the outer wall surface of each first side wall 215 corresponding to the first static contact portion 2231a; in the third direction D3, a second permanent magnet 262b is provided at a position on the outer wall surface of the second side wall 216 corresponding to the second static contact portion 2231b, and a third permanent magnet 262c is provided at a position on the outer wall surface of the second side wall 216 corresponding to the third static contact portion 2231c.

[0143] In one embodiment, the number of the static contacts 22 is two, and thus the outer wall surface of the insulating cover 21 is provided with two groups of first permanent magnets 262 a , second permanent magnets 262 b and third permanent magnets 262 c .

[0144] The arc force direction of the relay according to the embodiment of the present application is described in detail below with reference to FIG9 and FIG10 .

[0145] As shown in Figure 9 , the current flowing into the paper on the left side of the static contact 22 is directed into the paper, while the current flowing out of the paper on the right side of the static contact 22 is directed out of the paper. The polarity of the surface of the first permanent magnet 262a facing the first side wall 215 is the south pole, and the polarity of the surface facing away from the first side wall 215 is the north pole. The polarity of the surface of the second permanent magnet 262b and the third permanent magnet 262c facing the second side wall 216 is the north pole, and the polarity of the surface facing away from the second side wall 216 is the south pole. According to the left-hand rule, the resultant Ampere force acting on the arc generated between the left static contact 22 and the moving contact piece 31 is F1, and the direction of F1 is to the upper left. As can be seen from Figure 9 , the direction of F1 passes through the area between the first static contact portion 2231a and the second static contact portion 2231b. It can be seen from this that the direction of F1 avoids the first static contact part 2231a and the second static contact part 2231b, as well as the movable contact part 311 corresponding to the first static contact part 2231a and the second static contact part 2231b, thereby avoiding the arc contamination of the first static contact part 2231a and the second static contact part 2231b, as well as the movable contact part 311 corresponding to the first static contact part 2231a and the second static contact part 2231b under the action of F1.

[0146] Similarly, the resultant Ampere force acting on the arc generated between the right-hand stationary contact 22 and the movable contact piece 31 is F2, directed upward and to the right. F2 passes through the area between the first and third stationary contact portions 2231a, 2231c. Therefore, it can be seen that F2 avoids the first and third stationary contact portions 2231a, 2231c, and the movable contact portions 311 corresponding to them, thus preventing the arc from contaminating the first and third stationary contact portions 2231a, 2231c, and the movable contact portions 311 corresponding to them.

[0147] As shown in Figure 10, the current direction of the static contact 22 on the left is opposite to the current direction of the static contact 22 on the left shown in Figure 9 (that is, the current flow direction of the static contact 22 on the left shown in Figure 10 is out of the paper), and the current direction of the static contact 22 on the right is opposite to the current direction of the static contact 22 on the right shown in Figure 9 (that is, the current flow direction of the static contact 22 on the right shown in Figure 10 is into the paper).

[0148] According to the left-hand rule, the resultant Ampere force acting on the arc generated between the left stationary contact 22 and the movable contact piece 31 is F3, and its direction is downward and left. F3 passes through the area between the first stationary contact portion 2231a and the third stationary contact portion 2231c. Therefore, it can be seen that F3 avoids the first and third stationary contact portions 2231a, 2231c, and the movable contact portions 311 corresponding to them, thus preventing the arc from contaminating the first and third stationary contact portions 2231a, 2231c, and the movable contact portions 311 corresponding to them.

[0149] The resultant Ampere force acting on the arc generated between the right-side stationary contact 22 and the movable contact piece 31 is F4, directed downward and to the right. F4's direction passes through the area between the first stationary contact portion 2231a and the second stationary contact portion 2231b. This indicates that F4's direction avoids the first and second stationary contact portions 2231a, 2231b, and the movable contact portions 311 corresponding to them. This prevents the arc from contaminating the first and second stationary contact portions 2231a, 2231b, and the movable contact portions 311 corresponding to them, due to the action of F4.

[0150] As shown in FIG. 11 , the contact gap between at least one of the plurality of movable contact pieces 31 and the stationary contact 22 is smaller than the contact gaps between the remaining movable contact pieces 31 and the stationary contact 22 .

[0151] It should be noted that when the number of the movable contact pieces 31 is greater than or equal to three, the contact gap between one movable contact piece 31 and the static contact 22 is the smallest, and the contact gaps between the remaining movable contact pieces 31 and the static contact 22 may be equal or unequal.

[0152] In addition, when the number of the movable contact pieces 31 is greater than or equal to three, the contact gaps between two of the movable contact pieces 31 and the static contact 22 may be equal and the smallest, while the contact gaps between the remaining movable contact pieces 31 and the static contact 22 may be greater than the contact gaps of the two movable contact pieces 31.

[0153] In one embodiment, the contact gap between the first movable contact piece 31a and the first stationary contact portion 2231a is h1, the contact gap between the second movable contact piece 31b and the second stationary contact portion 2231b is h2, and the contact gap between the third movable contact piece 31c and the third stationary contact portion 2231c is h3, where h1<h2=h3.

[0154] In one embodiment, the length of one of the movable contact pieces 31 is greater than the lengths of the other movable contact pieces 31 , and the contact gap between the movable contact piece 31 with the longer length and the static contact 22 is smaller.

[0155] In one embodiment, the first movable contact piece 31a is longer and the contact gap between the first movable contact piece 31a and the static contact 22 is smaller, and the contact gaps between the second movable contact piece 31b and the third movable contact piece 31c and the static contact 22 are equal.

[0156] The following describes in detail the on-off sequence of the three moving contact pieces 31 and the static contacts 22 with reference to FIG. 11 to FIG. 13 , assuming that there are three moving contact pieces 31 .

[0157] During the closing process, since the gap between the movable iron core 41 and the stationary iron core 42 is constant, when the push rod member 33 drives the three movable contact pieces 31 to move simultaneously toward the stationary contact 22, the contact gap of the first movable contact piece 31a is smaller. Therefore, the first movable contact piece 31a contacts the stationary contact 22 before the second movable contact piece 31b and the third movable contact piece 31c. In other words, the first movable contact piece 31a, which has the smaller contact gap, is connected first. At this time, the second movable contact piece 31b and the third movable contact piece 31c have not yet contacted the stationary contact 22 (as shown in Figure 12).

[0158] Next, the push rod member 33 continues to move toward the stationary contact 22. Since the first movable contact piece 31a is already in contact with the stationary contact 22 and cannot move further, only the second and third movable contact pieces 31b, 31c move toward the stationary contact 22 until they also make contact with the stationary contact 22 (as shown in Figure 13). At this point, the movable iron core 41 has not yet made contact with the stationary iron core 42. While the second and third movable contact pieces 31b, 31c move from the positions shown in Figure 12 to those shown in Figure 13, the first movable contact piece 31a remains stationary and remains in an overtravel phase.

[0159] After the first, second, and third movable contact pieces 31a, 31b, and 31c all make contact with the stationary contact 22, the movable iron core 41 continues to move for a distance until it makes contact with the stationary iron core 42. During this stage of continued movement of the movable iron core 41, the first, second, and third movable contact pieces 31a, 31b, and 31c do not move further. At this time, the first, second, and third movable contact pieces 31a, 31b, and 31c are all in the overtravel stage.

[0160] It can be seen from this that the overtravel distance of the first movable contact piece 31 a is greater than the overtravel distances of the second movable contact piece 31 b and the third movable contact piece 31 c.

[0161] During the disconnection process, disconnection can be performed in the order shown in Figures 13 through 12 and 11. For the first, second, and third movable contact pieces 31a, 31b, and 31c, the disconnection process is the process of releasing overtravel and contact gap. Because the contact gap of the first movable contact piece 31a is smaller, the overtravel distance of the first movable contact piece 31a is larger. Therefore, during the disconnection process, the second and third movable contact pieces 31b, 31c disconnect before the first movable contact piece 31a. In other words, the first movable contact piece 31a, with its smaller contact gap, disconnects last.

[0162] It can be concluded that during the closing process, the first moving contact piece 31a is connected before the second moving contact piece 31b and the third moving contact piece 31c; during the disconnecting process, the second moving contact piece 31b and the third moving contact piece 31c are disconnected before the first moving contact piece 31a.

[0163] Therefore, the movable contact portion 311 of the second movable contact piece 31b and the second stationary contact portion 2231b, as well as the movable contact portion 311 of the third movable contact piece 31c and the third stationary contact portion 2231c, function as current carriers, while the movable contact portion 311 of the first movable contact piece 31a and the first stationary contact portion 2231a function as arc-proof contacts. In other words, an arc can occur between the movable contact portion 311 of the first movable contact piece 31a and the first stationary contact portion 2231a, but no arc can occur between the movable contact portion 311 of the second movable contact piece 31b and the second stationary contact portion 2231b, or between the movable contact portion 311 of the third movable contact piece 31c and the third stationary contact portion 2231c.

[0164] Furthermore, an arc is generated only at the two ends of the longer first movable contact piece 31a, while no arc is generated at the shorter second movable contact piece 31b and the third movable contact piece 31c. In combination with the direction of the Ampere force in Figures 9 and 10 above, it can be seen that the arc generated at the two ends of the first movable contact piece 31a can be drawn out from the length difference space between the first movable contact piece 31a and the second movable contact piece 31b and the third movable contact piece 31c. The direction of the arc drawing avoids the second movable contact piece 31b, the third movable contact piece 31c, and the second static contact portion 2231b and the third static contact portion 2231c corresponding to the second movable contact piece 31b and the third movable contact piece 31c, thereby preventing the arc from burning the second movable contact piece 31b and the third movable contact piece 31c.

[0165] According to the above introduction, the first static contact portion 2231a, the second static contact portion 2231b and the third static contact portion 2231c are staggered in the third direction D3, thereby increasing the distance between the contact position of the movable contact portion 311 of the first movable contact piece 31a and the first static contact portion 2231a, the contact position of the movable contact portion 311 of the second movable contact piece 31b and the second static contact portion 2231b, and the contact position of the movable contact portion 311 of the third movable contact piece 31c and the third static contact portion 2231c, thereby preventing the arc generated between the first static contact portion 2231a and the first movable contact piece 31a from contaminating the second static contact portion 2231b and the third static contact portion 2231c.

[0166] Referring back to Figure 7 , the relay of this embodiment further includes an anti-short-circuit structure 50 for generating a suction force on at least one movable contact piece 31 in the direction of contact closure. This suction force is capable of counteracting the electrodynamic repulsion between the movable contact piece 31 and the stationary contact 22 due to the short-circuit current, thereby preventing the movable contact piece 31 and the stationary contact 22 from bouncing apart. The suction force on the movable contact piece 31 with the smaller contact gap is less than the suction force on the other movable contact pieces 31.

[0167] It should be noted that the suction force on the movable contact piece 31 with a smaller contact gap is smaller than the suction force on the other movable contact pieces 31, which may include the following situations: the suction force on the movable contact piece 31 with a smaller contact gap is zero, and the suction force on the other movable contact pieces 31 is not zero; or, the suction force on each movable contact piece 31 is greater than zero, and the suction force on the movable contact piece 31 with a smaller contact gap is smaller than the suction force on the other movable contact pieces 31.

[0168] It should be noted that when the number of movable contact pieces 31 is three or greater, the contact gap between one movable contact piece 31 and the stationary contact 22 is the smallest, while the contact gaps between the remaining movable contact pieces 31 and the stationary contact 22 may be equal or unequal. Furthermore, the suction force on the movable contact piece 31 with the smallest contact gap is the smallest, while the suction forces on the remaining movable contact pieces 31 may be equal or unequal.

[0169] The following still takes the case where there are three movable contact pieces 31 as an example to describe in detail the breaking process of the three movable contact pieces 31 when the limit breaking current and the short-circuit current are respectively passed through the three movable contact pieces 31 .

[0170] When a maximum breaking current (e.g., 3kA) is applied, the first, second, and third movable contact pieces 31a, 31b, and 31c form a parallel circuit, allowing each of the first, second, and third movable contact pieces 31a, 31b, and 31c to carry a current of 1kA. During the breaking process, the second and third movable contact pieces 31b, 31c break before the first movable contact piece 31a. Therefore, immediately after the second and third movable contact pieces 31b, 31c break, the first movable contact piece 31a remains in contact with the stationary contact 22, allowing the entire 3kA current to flow into the first movable contact piece 31a. Furthermore, because the suction force exerted by the anti-short-circuit structure 50 on the first movable contact piece 31a is zero or minimal, the first movable contact piece 31a does not need to resist the suction force of the anti-short-circuit structure 50 during the breaking process, or the resisted suction force is minimal, thereby facilitating the overall disconnection of the relay.

[0171] When a short-circuit current (e.g., 30 kA) flows, the first, second, and third movable contact pieces 31a, 31b, and 31c form a parallel circuit, so a current of 10 kA flows through each of the first, second, and third movable contact pieces 31a, 31b, and 31c. Because the suction force exerted by the anti-short-circuit structure 50 on the first movable contact piece 31a is weaker than the suction force exerted on the second and third movable contact pieces 31b, 31c, the first movable contact piece 31a is ejected by the electrodynamic repulsive force between the contacts before the second and third movable contact pieces 31b, 31c. As a result, the current in the first movable contact piece 31a gradually decreases from 10 kA to 0 kA, while the current in the second and third movable contact pieces 31b, 31c, respectively, gradually decreases from 10 kA to 15 kA. Since the current of the second movable contact piece 31b and the third movable contact piece 31c gradually increases from 10kA to 15kA, and the current increase has a gradual process, the electromotive force between the contact points of the second movable contact piece 31b, the third movable contact piece 31c and the static contact 22 also tends to gradually increase, so that the suction force of the anti-short-circuit structure 50 acting on the second movable contact piece 31b and the third movable contact piece 31c can resist a certain electromotive force, play a role in delaying disconnection, and gain reaction time for the short-circuit disconnection of the entire circuit.

[0172] Therefore, the relay of the embodiment of the present application is conducive to achieving extreme disconnection between contacts, and can also achieve delayed disconnection of contacts during short circuit, thereby ensuring the reliability of the relay operation and extending the service life of the product.

[0173] As shown in Figure 14, the anti-short-circuit structure 50 includes a first magnetic conductor 51 and multiple second magnetic conductors 52. The first magnetic conductor 51 is located on the side of the multiple moving contact pieces 31 facing the stationary contact 22. The first magnetic conductor 51 and the orthographic projection of each moving contact piece 31 on the target plane have overlapping third projections. The multiple second magnetic conductors 52 are respectively fixedly connected to the sides of the multiple moving contact pieces 31 facing away from the stationary contact 22. The second magnetic conductors 52 form a magnetic circuit with the first magnetic conductor 51. The thickness of the second magnetic conductor 52 connected to the moving contact piece 31 with the smaller contact gap is less than the thickness of the second magnetic conductors 52 connected to the remaining moving contact pieces 31.

[0174] In one embodiment, the thickness of the second magnetic conductive body 52 corresponding to the first movable contact piece 31 a is smaller than the thickness of the second magnetic conductive body 52 corresponding to the second movable contact piece 31 b and the third movable contact piece 31 c.

[0175] It is understandable that the first magnetic conductor 51 and the second magnetic conductor 52 may be in a straight line or a U shape, and the first magnetic conductor 51 and the second magnetic conductor 52 may be made of soft magnetic materials such as iron, cobalt, nickel, and alloys thereof.

[0176] Optionally, the first magnetic conductor 51 may comprise multiple stacked magnetic conductive sheets. It will be appreciated that increasing the number of thinner magnetic conductive sheets can increase the overall thickness of the first magnetic conductor 51. On the one hand, thinner magnetic conductive sheets can be made from thin strips, resulting in lower material costs and easier handling. On the other hand, the number of magnetic conductive sheets can be flexibly adjusted based on the magnitude of the short-circuit current.

[0177] In one embodiment, the first magnetic conductor 51 is fixed relative to the insulating cover 21. For example, the first magnetic conductor 51 is connected to the top wall 213 of the insulating cover 21 via a connector 53. This transfers the suction force of the anti-short-circuit structure 50 to the insulating cover 21. Because the insulating cover 21 is a stationary component, excessive coil retention force is not required, thereby reducing the power consumption of the relay coil and the relay's size, thereby improving the relay's short-circuit resistance.

[0178] Of course, the first magnetic conductor 51 can also be fixed relative to the insulating cover 21 in the following manner: the first magnetic conductor 51 is fixedly disposed in the insulating cover 21 via a fixing bracket (not shown). Specifically, the fixing bracket is disposed in the insulating cover 21 and fixedly connected to the yoke plate, and the first magnetic conductor 51 is fixedly connected to the fixing bracket.

[0179] Furthermore, in another embodiment, the distance between the first and second magnetic conductors 51, 52 can be designed to be variable. Specifically, the distance between the first and second magnetic conductors 51, 52 can be adjusted based on the current, thereby varying the magnetic attraction between the first and second magnetic conductors 51, 52. This ensures both short-circuit protection and overload disconnection.

[0180] 15 to 17 , schematic diagrams of the anti-short circuit structure 50 and the plurality of movable contact pieces 31 according to three different embodiments are respectively introduced below.

[0181] As shown in Figure 15 , the anti-short-circuit structure 50 includes a first magnetic conductor 51 and at least one second magnetic conductor 52. The first magnetic conductor 51 is located on the side of the multiple movable contact pieces 31 facing the stationary contact 22. The first magnetic conductor 51 and the orthographic projection of each movable contact piece 31 on the target plane have overlapping third projections. Except for the movable contact pieces 31 with smaller contact gaps, each of the remaining movable contact pieces 31 has a second magnetic conductor 52 fixedly connected to the side facing away from the stationary contact 22. The first magnetic conductor 51 forms a magnetic circuit with the at least one second magnetic conductor 52.

[0182] In one embodiment, the anti-short-circuit structure 50 includes two second magnetic conductors 52. A second magnetic conductor 52 is connected to each of the second and third movable contact pieces 31b and 31c on the side facing away from the stationary contact 22. However, no second magnetic conductor 52 is provided on the side of the first movable contact piece 31a facing away from the stationary contact 22. As such, the suction force on the first movable contact piece 31a can be considered zero.

[0183] As shown in Figure 16, the anti-short circuit structure 50 includes at least one first magnetic conductor 51 and at least one second magnetic conductor 52. The at least one first magnetic conductor 51 is arranged on the side of the multiple moving contact pieces 31 facing the static contact 22; along the contact closing direction, the number and position of the at least one first magnetic conductor 51 correspond to the number and position of the remaining moving contact pieces 31; among the multiple moving contact pieces 31, except for the moving contact piece 31 with a smaller contact gap, the other moving contact pieces 31 are fixedly connected to a second magnetic conductor 52 on the side facing away from the static contact 22, and the corresponding first magnetic conductor 51 and second magnetic conductor 52 are used to form a magnetic circuit.

[0184] In one embodiment, a first magnetic conductor 51 is provided on the side of the second and third movable contact pieces 31b and 31c facing the stationary contact 22, while the first movable contact piece 31a is not provided with the first magnetic conductor 51 on the side facing the stationary contact 22. A second magnetic conductor 52 is provided on the side of the second and third movable contact pieces 31b and 31c facing away from the stationary contact 22, while the first movable contact piece 31a is not provided with the second magnetic conductor 52 on the side facing away from the stationary contact 22. As such, the suction force on the first movable contact piece 31a can be considered zero.

[0185] As shown in FIG17 , the anti-short circuit structure 50 includes at least one first magnetic conductor 51 . Except for the moving contact piece 31 with a smaller contact gap, all other moving contact pieces 31 are provided with a first magnetic conductor 51 on the side facing the static contact 22 .

[0186] In one embodiment, a first magnetic conductor 51 is provided on the side of the second movable contact piece 31b and the third movable contact piece 31c facing the stationary contact 22, while no first magnetic conductor 51 is provided on the side of the first movable contact piece 31a facing the stationary contact 22. Therefore, the suction force on the first movable contact piece 31a can be considered zero.

[0187] In summary, the relay of the embodiment of the present application has at least the following advantages and beneficial effects:

[0188] In the relay of the embodiment of the present application, the orthographic projections of the multiple groups of corresponding moving contact parts 311 and static contact parts 2231 between each static contact 22 and the multiple moving contact pieces 31 on a target plane have overlapping first projections, and at least one first projection among the multiple first projections is staggered in the third direction with the remaining first projections, so that the arc starting points formed between the multiple static contact parts 2231 and the multiple moving contact pieces 31 are staggered in the third direction, thereby increasing the distance between the arc starting points, avoiding the arcs formed by the multiple arc starting points from gathering and affecting each other, which is beneficial to improving the arc extinguishing performance.

[0189] Furthermore, the first movable contact piece 31a is longer and the contact gap between the first movable contact piece 31a and the static contact 22 is smaller, so that the arc is generated only at the two ends of the longer first movable contact piece 31a, while no arc is generated at the shorter second movable contact piece 31b and the third movable contact piece 31c. Combined with the arrangement of the permanent magnet 262 of the arc extinguishing part 26, the arc generated at the two ends of the first movable contact piece 31a can be drawn out from the space where the first movable contact piece 31a exceeds the second movable contact piece 31b and the third movable contact piece 31c. The direction of the arc drawing avoids the second movable contact piece 31b, the third movable contact piece 31c and the second static contact portion 2231b and the third static contact portion 2231c corresponding to the second movable contact piece 31b and the third movable contact piece 31c, thereby preventing the arc from burning the second movable contact piece 31b and the third movable contact piece 31c.

[0190] Furthermore, the relay in the embodiment of the present application also includes an anti-short-circuit structure 50, which is designed so that the contact gap between at least one of the multiple moving contact pieces 31 and the static contact 22 is smaller than the contact gap between the remaining moving contact pieces 31 and the static contact 22. This is conducive to achieving extreme disconnection between contacts and delayed disconnection of contacts during short circuit, thereby ensuring the reliability of the relay operation and extending the service life of the product.

[0191] Furthermore, at least a portion of at least one static contact portion 2231 of each static contact 22 extends out from the outer peripheral surface of the connecting portion 222, so that the contact position between the moving contact piece 31 and the static contact 22 is close to the insulating cover, that is, the arc starting point is closer to the insulating cover, which can play a role in quickly cooling the arc and is beneficial to improving the arc extinguishing performance.

[0192] It is understandable that the various embodiments / implementations provided in this application can be combined with each other without causing any contradiction, and they will not be illustrated one by one here.

[0193] In the application examples, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; "connected" can mean 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 application examples can be understood according to the specific circumstances.

[0194] In the description of the application embodiments, it should be understood that the terms "up", "down", "left", "right", "front", "back", "top", "bottom", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the application embodiments and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the application embodiments.

[0195] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the claimed invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0196] The above-described embodiments merely represent several implementation methods of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make a number of variations and improvements without departing from the concept of the present application, and these variations and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the patent application shall be based on the appended claims, and the description and drawings may be used to interpret the content of the claims.

Claims

1. A relay, characterized in that: include: a pair of stationary contacts arranged along a first direction, each of the stationary contacts having a plurality of stationary contact portions; A plurality of movable contact pieces, each of the movable contact pieces having two movable contact portions, the two movable contact portions being used to contact the static contact portion of the static contact; a plurality of corresponding groups of movable contact portions and static contact portions between each static contact and the plurality of movable contact pieces having overlapping first projections on a target plane, and at least one of the plurality of first projections being staggered with the remaining first projections.

2. The relay according to claim 1, wherein: There is no overlapping area between the orthographic projections of the plurality of movable contact pieces on the target plane.

3. The relay according to claim 2, characterized in that At least one of the plurality of first projections is staggered with the other first projections in a third direction; The movement directions of the plurality of movable contact pieces are defined as a second direction, the first direction, the second direction and the third direction are perpendicular to each other, and the target plane is perpendicular to the second direction.

4. The relay according to claim 3, characterized in that A moving contact portion is formed at each of the two ends of the moving contact piece in the length direction; The length of at least one of the movable contact pieces is greater than the lengths of the remaining movable contact pieces.

5. The relay according to claim 4, characterized in that Both ends of the movable contact piece with a relatively longer length extend beyond the rest of the movable contact pieces in the first direction.

6. The relay according to claim 4, characterized in that There are three movable contact pieces, which are arranged along the third direction; each of the stationary contacts has three stationary contact points; The length of the middle movable contact piece is greater than the lengths of the other two movable contact pieces.

7. The relay according to claim 6, characterized in that The lengths of the other two moving contact pieces are equal.

8. The relay according to claim 1, wherein: A contact gap between at least one of the plurality of movable contact pieces and the stationary contact is smaller than contact gaps between the remaining movable contact pieces and the stationary contact.

9. The relay according to claim 8, characterized in that A moving contact portion is formed at each of the two ends of the moving contact piece in the length direction; The length of one of the movable contact pieces is greater than the lengths of the other movable contact pieces, and the contact gap between the movable contact piece with the longer length and the static contact is smaller.

10. The relay according to claim 9, characterized in that There are three movable contact pieces, which are arranged along the third direction; each of the static contacts has three static contact points; The length of the middle movable contact piece is greater than that of the other two movable contact pieces, and the lengths of the other two movable contact pieces are equal.

11. The relay according to claim 8, characterized in that Also includes: The anti-short circuit structure is used to form a suction force on at least one of the movable contact pieces in the direction of contact closing; wherein the suction force on the movable contact piece with a smaller contact gap is smaller than the suction force on the other movable contact pieces.

12. The relay according to claim 11, wherein: The anti-short circuit structure comprises: a first magnetic conductor, provided on a side of the plurality of movable contact pieces facing the stationary contact; the first magnetic conductor and the respective orthographic projections of each movable contact piece on the target plane having a third projection overlapping each other; and At least one second magnetic conductor, and among the multiple moving contact pieces, except for the moving contact piece with a smaller contact gap, the other moving contact pieces are fixedly connected to a second magnetic conductor on the side facing away from the static contact, and the first magnetic conductor is used to form a magnetic circuit with at least one second magnetic conductor.

13. The relay according to claim 11, wherein: The anti-short circuit structure comprises: At least one first magnetic conductor is provided on a side of the plurality of movable contact pieces facing the stationary contact; along the contact closing direction, the number and position of the at least one first magnetic conductor respectively correspond to the number and position of the remaining movable contact pieces; and At least one second magnetic conductor, and among the multiple moving contact pieces, except for the moving contact piece with a smaller contact gap, the other moving contact pieces are fixedly connected to a second magnetic conductor on the side facing away from the static contact, and the corresponding first magnetic conductors and the second magnetic conductors are used to form a magnetic circuit.

14. The relay according to claim 11, wherein: The suction force on the moving contact piece with a smaller contact gap is zero.

15. The relay according to claim 14, characterized in that The anti-short circuit structure comprises: At least one first magnetic conductor is provided. Among the plurality of movable contact pieces, except for the movable contact piece with a smaller contact gap, the other movable contact pieces are each provided with a first magnetic conductor on a side facing the static contact.

16. The relay according to claim 11, wherein: The anti-short circuit structure comprises: a first magnetic conductor, provided on a side of the plurality of movable contact pieces facing the stationary contact; the first magnetic conductor and the respective orthographic projections of each movable contact piece on the target plane having a third projection overlapping each other; and Multiple second magnetic conductors, each of the movable contact pieces is fixedly connected to a second magnetic conductor on the side facing away from the static contact, and the first magnetic conductor and the second magnetic conductor are used to form a magnetic circuit; the thickness of the second magnetic conductor corresponding to the movable contact piece with a smaller contact gap is smaller than the thickness of the second magnetic conductor corresponding to the remaining movable contact pieces.

17. The relay according to claim 3, characterized in that The relay further comprises an insulating cover, the insulating cover having an inner cavity, and the insulating cover further having a pair of mounting holes communicating with the inner cavity; Each of the static contacts comprises an extension portion, a connecting portion and a contact portion, wherein the extension portion is connected to the contact portion via the connecting portion, and the two connecting portions are respectively provided in a pair of mounting holes, the extension portion is located on the outer surface of the insulating cover and is connected to the insulating cover; the contact portion is located in the inner cavity and has a plurality of static contact portions; At least a portion of at least one stationary contact portion of each stationary contact protrudes from an outer circumferential surface of the connecting portion.

18. The relay according to claim 17, wherein: The plurality of static contact portions of each static contact include a first static contact portion and a second static contact portion; along the first direction, at least portions of the two first static contact portions of the two static contacts extend away from each other from the outer peripheral surface of the corresponding connecting portion; At least a portion of the second static contact portion of each static contact extends beyond the outer circumferential surface of the connecting portion, and an angle is formed between an extending direction of the second static contact portion and an extending direction of the first static contact portion.

19. The relay according to claim 18, wherein: A first permanent magnet is provided on the outer surface of the insulating cover at a position corresponding to the first static contact portion, and a second permanent magnet is provided at a position corresponding to the second static contact portion; The polarity of a side surface of the first permanent magnet facing the insulating cover is opposite to the polarity of a side surface of the second permanent magnet facing the insulating cover.

20. The relay according to claim 18, wherein At least a portion of the second static contact portion extends out from an outer peripheral surface of the connecting portion along the third direction.

21. The relay according to claim 20, characterized in that The plurality of static contact portions of each static contact further includes a third static contact portion; Along the third direction, at least a portion of the second stationary contact portion and at least a portion of the third stationary contact portion of each stationary contact protrude from the outer circumferential surface of the connecting portion in directions away from each other.

22. The relay according to claim 21, characterized in that A first permanent magnet is provided on the outer surface of the insulating cover at a position corresponding to the first static contact portion, a second permanent magnet is provided at a position corresponding to the second static contact portion, and a third permanent magnet is provided at a position corresponding to the third static contact portion; The polarity of the surface of the second permanent magnet facing the insulating cover is the same as the polarity of the surface of the third permanent magnet facing the insulating cover, and opposite to the polarity of the surface of the first permanent magnet facing the insulating cover.

23. The relay according to claim 17, wherein: The protruding portion and the connecting portion are an integral structure, and the contact portion and the connecting portion are separate structures.

24. The relay according to claim 23, characterized in that The protruding portion and the connecting portion are made of a first material, and the contact portion is made of a second material, wherein the first material is different from the second material.

25. The relay according to claim 17, wherein: At least a portion of at least one of the stationary contact portions of each stationary contact protrudes from an outer circumferential surface of the protruding portion.

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