Relay

Abstract

The present application discloses a relay, comprising a pair of static contacts (22), a movable contact assembly (30a) and an anti-short-circuit structure (50). Two ends of the movable contact assembly (30a) in the length direction are used for being in contact with the pair of static contacts (22) respectively; the movable contact assembly (30a) comprises a plurality of movable branch parts (311); the anti-short-circuit structure (50) comprises first magnetizers (51) and connecting parts (53), the first magnetizers (51) are arranged on the side of the movable contact assembly (30a) facing the static contacts (22), the first magnetizers (51) are provided with a plurality of magnetically conductive parts (512) arranged at intervals, and the connecting parts (53) are connected to each two adjacent magnetically conductive parts (512); and in the movement direction of the movable contact assembly (30a), there are corresponding movable branch parts (311) and magnetically conductive parts (512) among the plurality of movable branch parts (311) and the plurality of magnetically conductive parts (512), and the orthographic projections of the corresponding magnetically conductive parts (512) and movable branch parts (311) on a target plane have an overlapping area, the target plane being perpendicular to the movement direction of the movable contact assembly (30a).

Description

relay

[0001] Related applications

[0002] This application claims priority to Chinese patent application number 2024101744099, entitled “RELAY,” filed on February 7, 2024, the entirety of which is incorporated herein by reference. Technical Field

[0003] The present application relates to the technical field of electric control devices, in particular to a relay. Background Art

[0004] 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.

[0005] A high-voltage DC relay is a type of relay consisting of a pair of stationary contacts and multiple moving contacts. Each moving contact contacts a pair of stationary contacts to close the relay. When a short-circuit load is high, the moving contacts of the high-voltage DC relay can spring open due to the electrodynamic repulsion generated by the short-circuit current. This instantaneous springing of the moving contacts can cause the relay to burn out or explode due to the strong arcing.

[0006] In conventional technology, to prevent relay contacts from bouncing open under short-circuit current, an anti-short-circuit structure is typically implemented. This anti-short-circuit structure includes a first magnetic conductor positioned on the side of the moving contact facing the stationary contact. When power is applied to the moving contact, the first magnetic conductor becomes magnetized, generating an attractive force in the direction of contact pressure. This attractive force counteracts the electrodynamic repulsive force between the moving and stationary contacts caused by the short-circuit current, preventing the moving and stationary contacts from bouncing open.

[0007] However, when the anti-short-circuit structure is combined with a plurality of movable contact pieces, the anti-short-circuit capability of the anti-short-circuit structure needs to be further improved. Summary of the Invention

[0008] An embodiment of the present application provides a relay capable of improving short-circuit resistance.

[0009] The relay of the embodiment of the present application includes:

[0010] A pair of static contacts;

[0011] A movable contact assembly, wherein both ends of the movable contact assembly in the longitudinal direction are used to contact with a pair of the static contacts respectively; the movable contact assembly includes a plurality of movable branches; and

[0012] An anti-short circuit structure, the anti-short circuit structure includes a first magnetic conductor and a connecting portion, the first magnetic conductor is arranged on the side of the movable contact assembly facing the static contact, the first magnetic conductor has a plurality of magnetic conductors arranged at intervals, and the connecting portion is connected to two adjacent magnetic conductors; in the movement direction of the movable contact assembly, the plurality of movable branches and the plurality of magnetic conductors have corresponding movable branches and magnetic conductors, and on a target plane, the corresponding magnetic conductors and the movable branches have overlapping areas in their respective orthographic projections, and the target plane is perpendicular to the movement direction of the movable contact assembly.

[0013] According to some embodiments of the present application, the plurality of movable branches are arranged along a third direction, and the plurality of magnetic conductive portions are arranged along the third direction;

[0014] The arrangement direction of the pair of static contacts is a first direction, the movement direction of the movable contact assembly is a second direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0015] According to some embodiments of the present application, the connecting portion is provided between two adjacent magnetic conductive portions, and the connecting portion and the two adjacent magnetic conductive portions form a through slot; along the second direction, the through slot passes through the first magnetic conductive body;

[0016] The second direction is the moving direction of the movable contact assembly.

[0017] According to some embodiments of the present application, two connecting portions are provided between two adjacent magnetic conductive portions in the first magnetic conductive body, and the two connecting portions respectively constitute two slot walls of the through slot that are opposite to each other along the third direction;

[0018] The arrangement direction of the pair of static contacts is defined as a first direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0019] According to some embodiments of the present application, the anti-short circuit structure includes a plurality of first magnetic conductors, which are stacked along the second direction. In the second direction, the positions of the through slots of the plurality of first magnetic conductors correspond.

[0020] According to some embodiments of the present application, the magnetic conductive portions at both ends of each of the first magnetic conductive bodies have first via holes;

[0021] The relay also includes an insulating cover and a connector, wherein the connector is inserted into a plurality of first through holes corresponding to the second direction, and one end of the connector is connected to the insulating cover, and the other end of the connector is connected to the magnetic conductive portion closest to the movable contact assembly among the plurality of first magnetic conductive bodies.

[0022] According to some embodiments of the present application, the connecting portion is provided on a side of the first magnetic conductor facing away from the movable contact assembly.

[0023] According to some embodiments of the present application, there is a gap between two adjacent magnetic conductive portions, and the connecting portion covers the gap between the two adjacent magnetic conductive portions.

[0024] According to some embodiments of the present application, along the second direction and the third direction, the gap penetrates the first magnetic conductor to separate the first magnetic conductor into a plurality of independently arranged magnetic conductive portions;

[0025] The arrangement direction of the pair of static contacts is defined as a first direction, the movement direction of the movable contact assembly is defined as a second direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0026] According to some embodiments of the present application, the anti-short circuit structure includes a plurality of first magnetic conductors, the plurality of first magnetic conductors are stacked along the second direction, and in the second direction, positions of the gaps of the plurality of first magnetic conductors correspond;

[0027] Among the plurality of first magnetic conductors, the first magnetic conductor farthest from the movable contact assembly is provided with the connecting portion on a side facing away from the movable contact assembly.

[0028] According to some embodiments of the present application, the relay further includes an insulating cover and a connector, and the connecting portion and the first magnetic conductor are connected to the insulating cover via the connector.

[0029] According to some embodiments of the present application, the magnetic conductive portions at both ends of the first magnetic conductive body have first via holes, and the connecting portion has second via holes, the first via holes and the second via holes corresponding in position to each other, the first via holes penetrate the magnetic conductive portion along the second direction, and the second via holes penetrate the connecting portion along the second direction;

[0030] The connecting member is passed through the first through hole and the second through hole, and the connecting member is connected to the magnetic conductive portion.

[0031] According to some embodiments of the present application, the connecting portion is provided between two adjacent magnetic conductive portions in the first magnetic conductive body, the connecting portion and the two adjacent magnetic conductive portions form a groove, the opening of the groove faces the movable contact assembly, and the connecting portion constitutes the bottom of the groove.

[0032] According to some embodiments of the present application, there is a gap between two adjacent magnetic conductive parts, and on the target plane, there is no overlapping area between the orthographic projections of the gap and the movable branch.

[0033] According to some embodiments of the present application, the anti-short circuit structure also includes a plurality of second magnetic conductors, which are respectively connected to the side of the plurality of movable branches facing away from the static contacts, and the corresponding second magnetic conductors and the magnetic conductive parts are used to form a magnetic conductive circuit.

[0034] According to some embodiments of the present application, on the target plane, there is no overlapping area between the gap between two adjacent magnetic conductive parts and the orthographic projections of the second magnetic conductive bodies.

[0035] According to some embodiments of the present application, the movable contact assembly includes a movable contact piece, which has a through groove. The through groove penetrates the movable contact piece along the thickness direction of the movable contact piece. In the width direction of the movable contact piece, the two opposite groove walls of the through groove are respectively the two movable branches.

[0036] According to some embodiments of the present application, the movable branch is a movable contact piece, and a plurality of the movable contact pieces are independently arranged with each other, and both ends of the length direction of each movable contact piece are used to contact a pair of the static contacts respectively.

[0037] According to some embodiments of the present application, 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.

[0038] According to some embodiments of the present application, the anti-short circuit structure is used to form a suction force on the plurality of movable contact pieces in a direction of contact closure;

[0039] The suction force on the movable contact piece with the smaller contact gap is smaller than the suction force on the other movable contact pieces.

[0040] According to some embodiments of the present application, the magnetic conductive portion is provided on a side of each of the movable contact pieces facing the static contact;

[0041] The anti-short-circuit structure also includes at least one second magnetic conductor. 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; along the movement direction of the movable contact assembly, a magnetic circuit is formed between the corresponding magnetic conductor and the second magnetic conductor.

[0042] According to some embodiments of the present application, the suction force on the movable contact piece with a smaller contact gap is zero.

[0043] According to some embodiments of the present application, except for the movable contact piece with a smaller contact gap, the other movable contact pieces are all provided with the magnetic conductive portion on a side facing the static contact.

[0044] According to some embodiments of the present application, the magnetic conductive portion is provided on a side of each of the movable contact pieces facing the static contact;

[0045] The anti-short circuit structure further includes a plurality of second magnetic conductors, and each of the movable contact pieces is fixedly connected to a second magnetic conductor on a side facing away from the static contact; along the movement direction of the movable contact assembly, a magnetic circuit is formed between the corresponding magnetic conductors and the second magnetic conductors;

[0046] The thickness of the second magnetic conductor corresponding to the movable contact piece with the smaller contact gap is smaller than the thickness of the second magnetic conductor corresponding to the other movable contact pieces.

[0047] According to some embodiments of the present application, the connecting portion is made of soft magnetic material.

[0048] One embodiment of the above application has at least the following advantages or beneficial effects:

[0049] In the relay of the present embodiment, the first magnetic conductor has multiple spaced-apart magnetic conductive portions. When the movable contact assembly is energized, the multiple magnetic conductive portions are magnetized, generating an attractive force along the contact pressure direction. Because adjacent magnetic conductive portions are separated, the mutual interference between the short-circuit ring magnetic fields formed by adjacent magnetic conductive portions is reduced, thereby improving short-circuit resistance. Furthermore, the connecting portion connects two adjacent magnetic conductive portions, allowing the anti-short-circuit structure to function as a single unit, improving assemblability and reducing the assembly space requirements of the anti-short-circuit structure.

[0050] Furthermore, the through slot or groove separates two adjacent magnetic conductive parts, and the connecting part is connected between the two adjacent magnetic conductive parts, which not only effectively reduces the mutual interference between the short-circuit ring magnetic fields formed by different magnetic conductive parts, but also relatively reduces the number of components of the anti-short-circuit structure, thereby improving the assemblability of the anti-short-circuit structure and reducing the requirements for assembly space.

[0051] Furthermore, the multiple magnetic conductive parts of the first magnetic conductive body are split, and the multiple split magnetic conductive parts are connected by a connecting part, which not only effectively reduces the mutual interference between the short-circuit ring magnetic fields formed by different magnetic conductive parts, but also improves the assemblability of the anti-short-circuit structure, reduces the requirements for assembly space, and ensures the firmness of the connection between the connector and the insulating cover.

[0052] Furthermore, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the disclosed drawings without any creative work.

[0054] FIG1 is a perspective schematic diagram showing a relay according to an embodiment of the present application.

[0055] FIG. 2 shows a cross-sectional view along the AA section line in FIG. 1 .

[0056] FIG3 shows a cross-sectional view along the BB section line in FIG1 , in which the coil frame, the coil, the magnetic cylinder and the U-shaped yoke are omitted.

[0057] FIG4 is a perspective schematic diagram showing the anti-short-circuit structure of the first embodiment of the present application.

[0058] FIG5 is a side view schematic diagram showing the anti-short circuit structure according to the first embodiment of the present application.

[0059] FIG6 is a perspective schematic diagram showing an anti-short-circuit structure according to a second embodiment of the present application.

[0060] FIG. 7 shows a cross-sectional view along the CC cutting line in FIG. 6 .

[0061] FIG8 is a side view schematic diagram showing an anti-short circuit structure according to a third embodiment of the present application.

[0062] FIG9 is a perspective schematic diagram showing a movable contact piece according to another embodiment of the present application.

[0063] FIG10 shows a partial schematic diagram when none of the three moving contact pieces are in contact with the stationary contacts.

[0064] FIG11 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.

[0065] FIG12 shows a partial schematic diagram when the three moving contact pieces are in contact with the stationary contacts.

[0066] 13 and 14 are schematic diagrams showing an anti-short circuit structure and a plurality of movable contact pieces according to two different embodiments.

[0067] The reference numerals are as follows: 21, insulating cover; 211, mounting hole; 212, inner cavity; 22, static contact; 2231a, first static contact portion; 2231b, second static contact portion; 2231c, third static contact portion; 24, frame; 25, yoke plate; 251, first through-hole; 26, arc extinguishing portion; 261, yoke clamp; 262, magnet; 27, metal cover; 30, moving assembly; 30a, movable contact assembly; 31, moving contact piece; 31a, first moving contact piece; 31b, second moving contact piece; 31c, third moving contact piece; 311, movable branch; 312, through-slot; 32, first elastic member; 33, push rod member; 40, magnetic circuit portion; 41, moving iron core; 42, static 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; 511a. Through-groove; 511b. Gap; 511c. Groove; 512. Magnetic conductor; 5121. First through-hole; 52. Second magnetic conductor; 53. Connecting portion; 531. Second through-hole; 54. Connecting member; D1. First direction; D2. Second direction; D3. Third direction. DETAILED DESCRIPTION

[0068] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0069] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent like or similar structures, and thus their detailed description will be omitted.

[0070] 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.

[0071] 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 .

[0072] 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.

[0073] In the embodiment of the present application, 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 can be connected to the insulating cover 21 by welding, but the present invention is not limited thereto.

[0074] 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.

[0075] In an embodiment of the present application, 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.

[0076] Continuing with Figures 2 and 3 , the movable assembly 30 includes a movable contact assembly 30a, a first elastic member 32, and a push rod member 33. The movable contact assembly 30a may include one or more movable contact pieces 31. In one embodiment, each movable contact piece 31 comprises a movable branch 311; in another embodiment, a single movable contact piece 31 may comprise multiple movable branches 311.

[0077] 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.

[0078] Multiple movable contact pieces 31 are disposed within the insulating cover 21, and each movable contact piece 31, at either end along the first direction D1, is configured to contact or separate from the bottom of a pair of stationary contacts 22. Because the movable contact pieces 31 do not restrict each other, their respective ends along the first direction D1 contact a pair of stationary contacts 22, forming a reliable parallel circuit. The number of contact points formed between the movable contact pieces 31 and a single stationary contact 22 is greater than or equal to two, achieving a current diversion effect.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] Continuing with Figures 2 and 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.

[0084] 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.

[0085] As shown in FIG2 and 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 is 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] As shown in Figure 2, the arc-extinguishing portion 26 includes a magnet 262, which is disposed on the outer side of the insulating cover 21. By disposing the 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.

[0091] In one embodiment, the magnet 262 is a permanent magnet.

[0092] The arc extinguishing portion 26 further includes a yoke clamp 261, and a 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 magnet 262 prevents the magnetic field generated by the magnet 262 from spreading outward and affecting the arc extinguishing effect.

[0093] 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.

[0094] 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.

[0095] As shown in Figure 3, the relay of the embodiment of the present application also includes an anti-short-circuit structure 50, which is used to generate a suction force on the moving contact piece 31 along the contact pressure direction. The suction force can resist the electric repulsion between the moving contact piece 31 and the static contact 22 due to the short-circuit current, thereby preventing the moving contact piece 31 and the static contact 22 from bouncing apart.

[0096] At the same time, since there are multiple moving contact pieces 31, according to the principle that the magnitude of the electric repulsive force is proportional to the square of the current, the magnitude of the electric repulsive force of each contact is significantly reduced, which is beneficial to improving the short-circuit resistance and improving the reliability of the relay.

[0097] As shown in Figures 3 and 4, the anti-short-circuit structure 50 includes a first magnetic conductor 51 and a connecting portion 53. The first magnetic conductor 51 is disposed on the side of the plurality of movable contact pieces 31 facing the stationary contact 22. The first magnetic conductor 51 has a plurality of spaced magnetic conductors 512, and the connecting portion 53 connects two adjacent magnetic conductors 512. In the direction of movement of the movable contact piece 31 (the second direction D2), the plurality of movable contact pieces 31 and the plurality of magnetic conductors 512 have corresponding movable contact pieces 31 and magnetic conductors 512, and the orthographic projections of the corresponding magnetic conductors 512 and movable contact pieces 31 on a target plane have an overlapping area. The target plane is perpendicular to the direction of movement of the movable contact piece 31 (the second direction D2).

[0098] In one embodiment, in the second direction D2, each movable contact piece 31 has a corresponding magnetic conductive portion 512; in another embodiment, in the second direction D2, some of the plurality of movable contact pieces 31 have corresponding magnetic conductive portions 512, while the remaining movable contact pieces 31 do not have corresponding magnetic conductive portions 512.

[0099] In the relay of the present embodiment, the first magnetic conductor 51 has multiple spaced magnetic conductive portions 512. When the movable contact piece 31 is energized, the multiple magnetic conductive portions 512 are magnetized, generating an attractive force along the contact pressure direction. Since adjacent magnetic conductive portions 512 are separated, the mutual interference between the short-circuit ring magnetic fields formed by adjacent magnetic conductive portions 512 is reduced, thereby improving the short-circuit resistance. Furthermore, the connecting portion 53 is connected to two adjacent magnetic conductive portions 512, allowing the anti-short-circuit structure to function as a single unit, improving assembly ease and reducing the assembly space requirements for the anti-short-circuit structure.

[0100] In the embodiment of the present application, there are three movable contact pieces 31 , and the first magnetic conductive body 51 has three magnetic conductive portions 512 . The three magnetic conductive portions 512 correspond to the three movable contact pieces 31 in the second direction D2 , respectively, but the present invention is not limited thereto.

[0101] As shown in Figures 3 and 4, multiple movable contact pieces 31 are arranged along the first direction D1, and multiple magnetic conductive portions 512 are arranged along the first direction D1. A gap 511b is formed between two adjacent magnetic conductive portions 512, and the orthographic projections of the gap 511b and the movable contact piece 31 on the target plane do not overlap.

[0102] In one embodiment, as shown in FIG. 4 and FIG. 5 , the connecting portion 53 is a flat plate structure, which is provided on the side of the first magnetic conductor 51 facing away from the movable contact piece 31 and covers the gap 511 b between two adjacent magnetic conductors 512 in the first magnetic conductor 51 .

[0103] Along the second direction D2 and the third direction D3, the gap 511b extends through the first magnetic conductive body 51 to separate the first magnetic conductive body 51 into a plurality of independently disposed magnetic conductive portions 512. In other words, the connecting portion 53 is provided with a plurality of independently disposed magnetic conductive portions 512 on the side facing the movable contact piece 31. The plurality of magnetic conductive portions 512 are spaced apart along the third direction D3.

[0104] The anti-short-circuit structure 50 includes a plurality of first magnetic conductors 51 stacked along the second direction D2, and the positions of the gaps 511b of the plurality of first magnetic conductors 51 correspond in the second direction D2; among the plurality of first magnetic conductors 51, the first magnetic conductor 51 farthest from the moving contact piece 31 is provided with a connecting portion 53 on the side facing away from the moving contact piece 31.

[0105] It is understood that by increasing the number of first magnetic conductors 51, the overall thickness of the plurality of first magnetic conductors 51 can be increased. On the one hand, each first magnetic conductor 51 is relatively thin and can be made from thin strip material, thereby reducing material costs and facilitating handling. On the other hand, the number of first magnetic conductors 51 can be flexibly adjusted based on the magnitude of the short-circuit current.

[0106] As shown in FIG4 , the anti-short circuit structure 50 further includes a plurality of second magnetic conductors 52 , which are respectively connected to the side of the plurality of movable contact pieces 31 facing away from the static contact 22 . The corresponding second magnetic conductors 52 and the magnetic conductive parts 512 are used to form a magnetic conductive circuit.

[0107] In one embodiment, there is no overlapping area between the orthographic projections of the gap 511 b and the second magnetic conductor 52 on the target plane.

[0108] When the movable contact piece 31 contacts the pair of stationary contacts 22 at both ends along the first direction D1, current flows through the movable contact piece 31, thereby forming a magnetic circuit surrounding the movable contact piece 31 between the magnetic conductive portion 512 and the second magnetic conductive body 52. ​​When a short-circuit current flows through the movable contact piece 31, an attractive force is generated between the magnetic conductive portion 512 and the second magnetic conductive body 52 in the direction of the contact pressure. This attractive force counteracts the electrodynamic repulsion between the movable contact piece 31 and the stationary contacts 22 caused by the short-circuit current, preventing the movable contact piece 31 and the stationary contacts 22 from bouncing apart.

[0109] It is understandable that the first magnetic conductor 51, the second magnetic conductor 52, and the connecting portion 53 can be straight or U-shaped, and can be made of soft magnetic materials such as iron, cobalt, nickel, and their alloys.

[0110] As shown in FIG. 5 , the plurality of magnetic conductive portions 512 in the first magnetic conductive body 51 are arranged at intervals, which reduces the mutual interference between the magnetic fields of different short-circuit rings and ensures the attraction between the corresponding magnetic conductive portions 512 and the second magnetic conductive body 52 .

[0111] Referring back to Figure 3 , the first magnetic conductor 51 and the connecting portion 53 are fixed relative to the insulating cover 21. This transfers the short-circuit-resistant suction force to the insulating cover 21. Because the insulating cover 21 is a stationary component, there's no need for excessive coil retention force, which reduces the relay's coil power consumption and size, improving its short-circuit resistance.

[0112] In one embodiment, the connecting portion 53 and the first magnetic conductor 51 are connected to the insulating cover 21 via a connector 54. The magnetic conductors 512 at both ends of the first magnetic conductor 51 have first through-holes 5121, and the connecting portion 53 has second through-holes 531 corresponding to the positions of the first through-holes 5121. The first through-holes 5121 penetrate the first magnetic conductor 51 along the second direction D2, and the second through-holes 531 penetrate the connecting portion 53 along the second direction D2. The connector 54 is disposed through the first through-holes 5121 and the second through-holes 531 and is connected to the magnetic conductor 512.

[0113] The connection method between one axial end of the connector 54 and the insulating cover 21 can be implemented in various ways, such as welding, riveting, screwing, bonding, etc. The connection method between the other axial end of the connector 54 and the magnetic conductive portion 512 can also be implemented in various ways, such as welding, riveting, screwing, bonding, clamping, etc.

[0114] When one axial end of the connecting member 54 is connected to the insulating cover 21 by welding, the top wall of the insulating cover 21 may have a through hole, the connecting member 54 is passed through the through hole, and one axial end of the connecting member 54 is welded to the outer wall surface of the top wall of the insulating cover 21, but is not limited to this.

[0115] It is understood that when the anti-short-circuit structure 50 includes a connecting portion 53 and a first magnetic conductor 51, the connecting member 54 passes through the second through-hole 531 of the connecting portion 53 and the first through-hole 5121 of the magnetic conductor 512 of the first magnetic conductor 51, and the connecting member 54 is connected to the magnetic conductor 512 of the first magnetic conductor 51. The outer peripheral surface of the connecting member 54 may also be provided with a stepped structure, which abuts against the peripheral edge of the second through-hole 531 on the side of the connecting portion 53 facing away from the movable contact piece 31.

[0116] When the anti-short circuit structure 50 includes a connecting portion 53 and multiple first magnetic conductors 51, the connecting member 54 passes through the second through hole 531 of the connecting portion 53 and the first through hole 5121 of the multiple magnetic conductors 512 of the multiple first magnetic conductors 51, and the connecting member 54 is connected to the magnetic conductor 512 of the first magnetic conductor 51 that is closest to the moving contact piece 31 among the multiple first magnetic conductors 51.

[0117] In the embodiment of the present application, the multiple magnetic conductive parts 512 of the first magnetic conductive body 51 are split, and the multiple split magnetic conductive parts 512 are connected by a connecting part 53, which effectively reduces the mutual interference between the short-circuit ring magnetic fields formed by different magnetic conductive parts 512, and improves the assemblability of the anti-short-circuit structure, reduces the requirements for assembly space, and ensures the firmness of the connection between the connecting part 54 and the insulating cover 21.

[0118] Of course, the first magnetic conductor 51 and the connecting portion 53 may 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). The fixing bracket is disposed in the insulating cover 21 and fixedly connected to the yoke plate 25. The first magnetic conductor 51 and the connecting portion 53 are fixedly connected to the fixing bracket.

[0119] In addition, the first magnetic conductor 51 and the connecting portion 53 may also be fixedly connected to the push rod member 33 to form a follow-up anti-short-circuit structure.

[0120] In another embodiment, the distance between the first and second magnetic conductors 51, 52 can be designed to be variable. The spacing 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.

[0121] As shown in FIG6 and FIG7 , the anti-short circuit structure 50 of the second embodiment of the present application is similar to the anti-short circuit structure 50 of the first embodiment and is not described in detail. The difference between the two embodiments is as follows:

[0122] The anti-short circuit structure 50 includes a plurality of first magnetic conductive bodies 51 stacked along the second direction D2 . Each first magnetic conductive body 51 has a plurality of magnetic conductive portions 512 spaced apart from each other.

[0123] A connecting portion 53 is provided between two adjacent magnetic conductive portions 512 of the first magnetic conductive body 51. The connecting portion 53 and the two adjacent magnetic conductive portions 512 together form a through slot 511a. The through slot 511a extends through the first magnetic conductive body 51 along the second direction D2. The connecting portion 53 and the magnetic conductive portions 512 are integrally formed.

[0124] In one embodiment, the through-slots 511a of the plurality of first magnetic conductors 51 correspond to each other in the second direction D2. The orthographic projections of the through-slots 511a and the movable branch 311 on the target plane do not overlap. The orthographic projections of the through-slots 511a and the second magnetic conductors 52 on the target plane do not overlap.

[0125] In the embodiment of the present application, the through groove 511a separates two adjacent magnetic conductive parts 512, and the connecting part 53 is connected between the two adjacent magnetic conductive parts 512, which effectively reduces the mutual interference between the short-circuit ring magnetic fields formed by different magnetic conductive parts 512, and relatively reduces the number of components of the anti-short-circuit structure, thereby improving the assemblability of the anti-short-circuit structure and reducing the requirements for assembly space.

[0126] Furthermore, two connecting portions 53 are provided between two adjacent magnetic conductive portions 512 , and the two connecting portions 53 respectively constitute two slot walls of the through slot 511 a that are opposite to each other along the first direction D1 .

[0127] In one embodiment, along the third direction D3, the through slot 511a does not penetrate both side surfaces of the first magnetic conductor 51 along the first direction D1. Of course, in another embodiment, the through slot 511a may only penetrate one side surface of the first magnetic conductor 51 along the first direction D1.

[0128] The magnetic conductive portions 512 at both ends of each first magnetic conductive body 51 have first through holes 5121 , and the first through holes 5121 are used for the connector 54 to pass through.

[0129] The magnetic conductive portions 512 at both ends of each first magnetic conductive body 51 have first through-holes 5121. A connector 54 is disposed within the corresponding first through-holes 5121 in the second direction D2. One end of the connector 54 is connected to the insulating cover 21, and the other end of the connector 54 is connected to the magnetic conductive portion 512 closest to the movable contact assembly 30a among the first magnetic conductive bodies 51. The connection between one end of the connector 54 and the insulating cover 21, and between the other end of the connector 54 and the magnetic conductive portion 512, can be achieved by welding, riveting, or bonding, etc., which is not limited in this application.

[0130] As shown in FIG8 , the anti-short circuit structure 50 of the third embodiment of the present application is similar to the anti-short circuit structure 50 of the first embodiment and is not described in detail. The difference between the two embodiments is as follows:

[0131] A connecting portion 53 is provided between two adjacent magnetic conductive portions 512 of the first magnetic conductive body 51. The connecting portion 53 and the magnetic conductive portions 512 are integrally formed. The connecting portion 53 and the two adjacent magnetic conductive portions 512 together form a groove 511c that opens toward the movable contact piece 31. The connecting portion 53 forms the bottom of the groove 511c.

[0132] In one embodiment, the orthographic projections of the groove 511 c and the movable branch 311 on the target plane do not overlap. The orthographic projections of the groove 511 c and the second magnetic conductor 52 on the target plane do not overlap.

[0133] In the embodiment of the present application, the groove 511c separates two adjacent magnetic conductive portions 512, and the connecting portion 53 is connected between the two adjacent magnetic conductive portions 512, which effectively reduces the mutual interference between the short-circuit ring magnetic fields formed by different magnetic conductive portions 512, and relatively reduces the number of components of the anti-short-circuit structure, thereby improving the assemblability of the anti-short-circuit structure and reducing the requirements for assembly space.

[0134] As shown in FIG. 9 , in other embodiments, the multiple movable branches 311 may not be independent of each other, but the multiple movable branches 311 may be an integrated structure.

[0135] Specifically, the movable contact assembly 30a includes a movable contact piece 31. The two ends of the movable contact piece 31 in the longitudinal direction (first direction D1) are configured to contact a pair of stationary contacts 22. The movable contact piece 31 has a through slot 312 extending through the movable contact piece 31 along its thickness (second direction D2). The two opposing walls of the through slot 312, located along the width (third direction D3) of the movable contact piece 31, serve as two movable branches 311. Two adjacent second magnetic conductors 52 are disposed within the through slot 312.

[0136] It is understandable that the movable contact piece 31 may have one or more through slots 312 . When there are multiple through slots 312 , the multiple through slots 312 are arranged along the width direction (third direction D3 ) of the movable contact piece 31 .

[0137] As shown in FIG. 10 , 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 .

[0138] 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.

[0139] 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.

[0140] In the embodiment of the present application, the three movable contact pieces are defined as the first movable contact piece 31a, the second movable contact piece 31b, and the third movable contact piece 31c. The portion of the stationary contact 22 that contacts the first movable contact piece 31a is defined as the first stationary contact portion 2231a, the portion of the stationary contact 22 that contacts the second movable contact piece 31b is defined as the second stationary contact portion 2231b, and the portion of the stationary contact 22 that contacts the third movable contact piece 31c is defined as the third stationary contact portion 2231c. 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.

[0141] The following describes in detail the on-off sequence of the three moving contact pieces 31 and the static contact 22 with reference to FIG. 10 to FIG. 12 , assuming that there are three moving contact pieces 31 .

[0142] 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 11).

[0143] 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 12). At this point, the movable iron core 41 has not yet made contact with the stationary iron core 42. During the movement of the second and third movable contact pieces 31b, 31c from the position shown in Figure 11 to the position shown in Figure 12, the first movable contact piece 31a remains stationary and remains in an overtravel phase.

[0144] 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.

[0145] 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.

[0146] During the disconnection process, disconnection can be performed in the order shown in Figures 12, 11, and 10. 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.

[0147] 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.

[0148] In one embodiment, the suction force on the movable contact piece 31 having the smaller contact gap is smaller than the suction force on the other movable contact pieces 31 .

[0149] 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.

[0150] 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.

[0151] 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 .

[0152] 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.

[0153] 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.

[0154] 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.

[0155] The following describes how the anti-short-circuit structures of three different embodiments can achieve that the suction force on the moving contact piece with the smaller contact gap is smaller than the suction force on the other moving contact pieces.

[0156] As shown in Figures 3 and 5 , each movable contact piece 31 has a magnetic conductive portion 512 on the side facing the stationary contact 22, and a second magnetic conductive body 52 on the side facing away from the stationary contact 22. A magnetic conductive circuit is formed between the corresponding magnetic conductive portion 512 and the second magnetic conductive body 52. ​​The thickness of the second magnetic conductive body 52 corresponding to the movable contact piece 31 with the smaller contact gap is smaller than that of the second magnetic conductive body 52 corresponding to the remaining movable contact pieces 31.

[0157] In the embodiment of the present application, 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.

[0158] As shown in Figure 13, each movable contact piece 31 is provided with a magnetic conductive portion 512 on the side facing the static contact 22. Among the multiple movable contact pieces 31, except for the movable contact piece 31 with a smaller contact gap, the other movable contact pieces 31 are fixedly connected to a second magnetic conductive body 52 on the side facing away from the static contact 22; along the movement direction of the movable contact assembly (the second direction D2), a magnetic conductive circuit is formed between the corresponding magnetic conductive portion 512 and the second magnetic conductive body 52.

[0159] In the embodiment of the present application, the second movable contact piece 31 b and the third movable contact piece 31 c are connected to the second magnetic conductor 52 , while the first movable contact piece 31 a is not connected to the second magnetic conductor 52 .

[0160] As shown in FIG. 14 , except for the movable contact piece 31 having a smaller contact gap, the other movable contact pieces 31 are all provided with a magnetic conductive portion 512 on the side facing the static contact 22 .

[0161] In the embodiment of the present application, the first movable contact piece 31 a has no magnetic conductive portion 512 on its side facing the stationary contact 22 , while the second movable contact piece 31 b and the third movable contact piece 31 c have magnetic conductive portions 512 on their sides facing the stationary contact 22 .

[0162] In summary, the relay of the embodiment of the present application has at least the following advantages and beneficial effects:

[0163] In the relay of the present embodiment, the first magnetic conductor 51 has multiple spaced magnetic conductive portions 512. When the movable contact piece 31 is energized, the multiple magnetic conductive portions 512 are magnetized, generating an attractive force along the contact pressure direction. Since adjacent magnetic conductive portions 512 are separated, the mutual interference between the short-circuit ring magnetic fields formed by adjacent magnetic conductive portions 512 is reduced, thereby improving the short-circuit resistance. Furthermore, the connecting portion 53 is connected to two adjacent magnetic conductive portions 512, allowing the anti-short-circuit structure to function as a single unit, improving assembly ease and reducing the assembly space requirements for the anti-short-circuit structure.

[0164] Furthermore, the multiple magnetic conductive parts 512 of the first magnetic conductive body 51 are split, and the multiple split magnetic conductive parts 512 are connected by a connecting part 53, which effectively reduces the mutual interference between the short-circuit ring magnetic fields formed by different magnetic conductive parts 512, and improves the assemblability of the anti-short-circuit structure, reduces the requirements for assembly space, and ensures the firmness of the connection between the connecting part 54 and the insulating cover 21.

[0165] Furthermore, the through groove 511a or the groove 511c separates two adjacent magnetic conductive parts 512, and the connecting part 53 is connected between the two adjacent magnetic conductive parts 512, which effectively reduces the mutual interference between the short-circuit ring magnetic fields formed by different magnetic conductive parts 512, and relatively reduces the number of components of the anti-short-circuit structure, thereby improving the assemblability of the anti-short-circuit structure and reducing the requirements for assembly space.

[0166] Furthermore, 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.

[0167] 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.

[0168] 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.

[0169] In the description of the application embodiments, it should be understood that the terms "up", "down", "left", "right", "front", "back", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the application embodiments and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the application embodiments.

[0170] 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.

[0171] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A relay, characterized in that: include: A pair of static contacts; A movable contact assembly, wherein both ends of the movable contact assembly in the longitudinal direction are used to contact the pair of static contacts respectively; The movable contact assembly includes a plurality of movable branches; as well as An anti-short circuit structure, the anti-short circuit structure includes a first magnetic conductor and a connecting portion, the first magnetic conductor is arranged on the side of the movable contact assembly facing the static contact, the first magnetic conductor has a plurality of magnetic conductors arranged at intervals, and the connecting portion is connected to two adjacent magnetic conductors; in the movement direction of the movable contact assembly, the plurality of movable branches and the plurality of magnetic conductors have corresponding movable branches and magnetic conductors, and on a target plane, the corresponding magnetic conductors and the movable branches have overlapping areas in their respective orthographic projections, and the target plane is perpendicular to the movement direction of the movable contact assembly.

2. The relay according to claim 1, wherein: The plurality of movable branches are arranged along a third direction, and the plurality of magnetic conductive parts are arranged along the third direction; The arrangement direction of the pair of static contacts is a first direction, the movement direction of the movable contact assembly is a second direction, and the first direction, the second direction and the third direction are perpendicular to each other.

3. The relay according to claim 1, wherein: The connecting portion is provided between two adjacent magnetic conductive portions, and the connecting portion and the two adjacent magnetic conductive portions form a through slot; along the second direction, the through slot passes through the first magnetic conductive body; The second direction is the moving direction of the movable contact assembly.

4. The relay according to claim 3, characterized in that Two connecting portions are provided between two adjacent magnetic conductive portions in the first magnetic conductive body, and the two connecting portions respectively constitute two slot walls of the through slot that are opposite to each other along the third direction; The arrangement direction of the pair of static contacts is defined as a first direction, and the first direction, the second direction and the third direction are perpendicular to each other.

5. The relay according to claim 3, characterized in that The anti-short circuit structure includes a plurality of first magnetic conductors, which are stacked along the second direction. In the second direction, positions of the through slots of the plurality of first magnetic conductors correspond to each other.

6. The relay according to claim 5, characterized in that The magnetic conductive parts at both ends of each of the first magnetic conductive bodies have first through holes; The relay also includes an insulating cover and a connector, wherein the connector is inserted into a plurality of first through holes corresponding to the second direction, and one end of the connector is connected to the insulating cover, and the other end of the connector is connected to the magnetic conductive portion closest to the movable contact assembly among the plurality of first magnetic conductive bodies.

7. The relay according to claim 1, wherein: The connecting portion is arranged on a side of the first magnetic conductor facing away from the movable contact component.

8. The relay according to claim 7, characterized in that There is a gap between two adjacent magnetic conductive parts, and the connecting part covers the gap between the two adjacent magnetic conductive parts.

9. The relay according to claim 8, characterized in that Along the second direction and the third direction, the gap penetrates the first magnetic conductor to separate the first magnetic conductor into a plurality of independently arranged magnetic conductive portions; The arrangement direction of the pair of static contacts is defined as a first direction, the movement direction of the movable contact assembly is defined as a second direction, and the first direction, the second direction and the third direction are perpendicular to each other.

10. The relay according to claim 9, characterized in that The anti-short circuit structure includes a plurality of first magnetic conductors, the plurality of first magnetic conductors are stacked along the second direction, and the positions of the gaps of the plurality of first magnetic conductors correspond to each other in the second direction; Among the plurality of first magnetic conductors, the first magnetic conductor farthest from the movable contact assembly is provided with the connecting portion on a side facing away from the movable contact assembly.

11. The relay according to claim 9, characterized in that The relay further includes an insulating cover and a connector, and the connecting portion and the first magnetic conductor are connected to the insulating cover via the connector.

12. The relay according to claim 11, wherein: The magnetic conductive portions at both ends of the first magnetic conductive body have first via holes, and the connecting portion has second via holes, the first via holes and the second via holes corresponding to each other in position, the first via holes penetrate the magnetic conductive portion along the second direction, and the second via holes penetrate the connecting portion along the second direction; The connecting member is passed through the first through hole and the second through hole, and the connecting member is connected to the magnetic conductive portion.

13. The relay according to claim 1, wherein: The connecting portion is provided between two adjacent magnetic conductive portions in the first magnetic conductive body. The connecting portion and the two adjacent magnetic conductive portions form a groove. The opening of the groove faces the movable contact assembly, and the connecting portion constitutes the bottom of the groove.

14. The relay according to claim 1, wherein: There is a gap between two adjacent magnetic conductive parts, and on the target plane, there is no overlapping area between the orthographic projections of the gap and the movable branch.

15. The relay according to any one of claims 1 to 14, characterized in that: The anti-short circuit structure further includes a plurality of second magnetic conductors, which are respectively connected to the side of the movable branches facing away from the static contacts, and the corresponding second magnetic conductors and the magnetic conductive parts are used to form a magnetic conductive circuit.

16. The relay according to claim 15, characterized in that On the target plane, there is no overlapping area between the gap between two adjacent magnetic conductive parts and the orthographic projections of the second magnetic conductive bodies.

17. The relay according to any one of claims 1 to 14, characterized in that: The movable contact assembly includes a movable contact piece having a through slot that penetrates the movable contact piece along its thickness direction. In the width direction of the movable contact piece, two opposite slot walls of the through slot are respectively the two movable branches.

18. The relay according to any one of claims 1 to 14, characterized in that: The movable branch is a movable contact piece, and a plurality of the movable contact pieces are independently arranged with each other. Both ends of the length direction of each movable contact piece are used to contact with a pair of the static contacts respectively.

19. The relay according to claim 18, 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.

20. The relay according to claim 19, wherein: The anti-short circuit structure is used to form a suction force on the plurality of movable contact pieces in the direction of contact closing; The suction force on the movable contact piece with the smaller contact gap is smaller than the suction force on the other movable contact pieces.

21. The relay according to claim 20, characterized in that The magnetic conductive portion is provided on a side of each of the movable contact pieces facing the static contact; The anti-short-circuit structure also includes at least one second magnetic conductor. 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; along the movement direction of the movable contact assembly, a magnetic circuit is formed between the corresponding magnetic conductor and the second magnetic conductor.

22. The relay according to claim 20, wherein: The suction force on the moving contact piece with a smaller contact gap is zero.

23. The relay according to claim 22, characterized in that Among the plurality of movable contact pieces, except for the movable contact piece with a smaller contact gap, the remaining movable contact pieces are all provided with the magnetic conductive portion on a side facing the static contact.

24. The relay according to claim 20, wherein: The magnetic conductive portion is provided on a side of each of the movable contact pieces facing the static contact; The anti-short circuit structure further includes a plurality of second magnetic conductors, and each of the movable contact pieces is fixedly connected to a second magnetic conductor on a side facing away from the static contact; along the movement direction of the movable contact assembly, a magnetic circuit is formed between the corresponding magnetic conductors and the second magnetic conductors; The thickness of the second magnetic conductor corresponding to the movable contact piece with the smaller contact gap is smaller than the thickness of the second magnetic conductor corresponding to the other movable contact pieces.

25. The relay according to any one of claims 1 to 14, characterized in that: The connecting portion is made of soft magnetic material.

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