relay

Abstract

The application discloses a relay, comprising a pair of static contact lead-out ends, a plurality of moving contact springs and an anti-short circuit structure. Two ends of each moving contact spring are used for contacting or separating from the pair of static contact lead-out ends along a first direction; the first direction is the arrangement direction of the pair of static contact lead-out ends. The contact gap between one of the plurality of moving contact springs and the static contact lead-out end is smaller than the contact gap between the rest of the moving contact springs and the static contact lead-out end. The anti-short circuit structure is used for forming an attraction force on the plurality of moving contact springs in the direction of contact closing. The attraction force on the moving contact spring with the smaller contact gap is smaller than the attraction force on the rest of the moving contact springs.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic control devices, in particular to a relay. BACKGROUND

[0002] A relay is an electronic control device, which has a control system (also known as an input circuit) and a controlled system (also known as an output circuit), and is usually applied in an automatic control circuit. The relay is actually a kind of "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays a role of automatic regulation, safety protection, and conversion of circuits in the circuit.

[0003] A high-voltage direct-current relay is a kind of relay. In order to solve the problem that the contact of the high-voltage direct-current relay is repelled due to the electric repulsion force generated by the short-circuit current, the related technology usually sets an anti-short-circuit structure. However, since the anti-short-circuit capability and the breaking capacity are negatively correlated, the breaking capacity is weakened. Therefore, the structure of the relay in the related technology still needs to be further optimized. SUMMARY

[0004] The relay provided by the embodiments of the present application is beneficial to realize the limit breaking of the contacts and the delayed breaking of the contacts, so as to solve the problems in the related technology.

[0005] The relay provided by the embodiments of the present application comprises:

[0006] a pair of static contact leading ends;

[0007] a plurality of moving contact springs, each of which is used to contact or separate from the pair of static contact leading ends at two ends thereof along a first direction; the first direction is the arrangement direction of the pair of static contact leading ends; wherein the contact gap between at least one of the moving contact springs and the static contact leading end is smaller than the contact gap between the remaining moving contact springs and the static contact leading end; and

[0008] an anti-short-circuit structure for forming an attractive force in the direction of contact closing on at least one of the moving contact springs; wherein the attractive force on the moving contact spring with the smaller contact gap is smaller than the attractive force on each of the remaining moving contact springs.

[0009] According to some embodiments of the present application, the anti-short-circuit structure comprises:

[0010] a first magnetic conductor arranged on the side of the plurality of moving contact springs facing the static contact leading end; along the direction of contact closing, the first magnetic conductor at least partially overlaps each of the moving contact springs; and

[0011] At least one second magnetic conductor, one of the second magnetic conductors is fixedly connected to the side of each of the plurality of moving contact blades away from the fixed contact lead end, and the corresponding first magnetic conductor and the second magnetic conductor are used to form a magnetic conducting loop.

[0012] According to some embodiments of the present application, the relay further comprises a contact container, the contact container is provided with a pair of first through holes, and a pair of the fixed contact lead ends are respectively arranged in the pair of first through holes; the plurality of moving contact blades are arranged in the contact container;

[0013] The first magnetic conductor is arranged in the contact container and is fixedly arranged relative to the contact container.

[0014] According to some embodiments of the present application, the contact container comprises:

[0015] A yoke plate; and

[0016] An insulating cover, the insulating cover is arranged on one side surface of the yoke plate, the insulating cover is provided with a pair of first through holes; and the first magnetic conductor is connected to the insulating cover through a connecting piece.

[0017] According to some embodiments of the present application, the insulating cover is provided with a third through hole;

[0018] The connecting piece is in the shape of a rod and is arranged in the third through hole; one end of the connecting piece is connected to the insulating cover, and the other end of the connecting piece is connected to the first magnetic conductor.

[0019] According to some embodiments of the present application, the insulating cover comprises a ceramic cover and a frame piece, and the ceramic cover is connected to the yoke plate through the frame piece;

[0020] The ceramic cover is provided with a pair of first through holes; and the first magnetic conductor is connected to the ceramic cover through the connecting piece.

[0021] According to some embodiments of the present application, the anti-short circuit structure comprises:

[0022] At least one first magnetic conductor, the first magnetic conductor is arranged on the side of the plurality of moving contact blades facing the fixed contact lead end; and the number and position of the at least one first magnetic conductor correspond to the number and position of the remaining moving contact blades in the direction of contact closing; and

[0023] At least one second magnetic conductor, one of the second magnetic conductors is fixedly connected to the side of each of the plurality of moving contact blades away from the fixed contact lead end, and the corresponding first magnetic conductor and the second magnetic conductor are used to form a magnetic conducting loop.

[0024] According to some embodiments of the present application, the relay further comprises:

[0025] A push rod assembly, a plurality of the moving blades are installed on the push rod assembly through an elastic assembly, the elastic assembly is used to provide contact pressure to the plurality of the moving blades;

[0026] A plurality of the first magnetic conductors are installed on the push rod assembly.

[0027] According to some embodiments of the present application, the moving direction of the moving blade is defined as a second direction; the push rod assembly comprises:

[0028] A push rod;

[0029] A contact support, comprising a top wall and two side walls, one end of the two side walls is connected to the two sides of the top wall along a third direction respectively, and the other end of the two side walls is connected with the push rod respectively; the first direction, the second direction and the third direction are perpendicular to each other;

[0030] Among them, a plurality of the first magnetic conductors are connected to the top wall.

[0031] According to some embodiments of the present application, the top wall comprises a first section, a second section and a bending section, the bending section is connected to the first section and is connected to the second section in a direction away from the push rod; one end of the two side walls is connected to the first section and the second section respectively;

[0032] At least one of the first magnetic conductors is connected to the side surface of the second section facing the push rod, and the side surface of at least one of the first magnetic conductors facing the push rod is flush with the side surface of the first section facing the push rod.

[0033] According to some embodiments of the present application, the suction force on the moving blade with smaller contact gap is zero.

[0034] According to some embodiments of the present application, the anti-short circuit structure comprises:

[0035] At least one first magnetic conductor, the remaining moving blades except the moving blade with smaller contact gap among the plurality of moving blades are provided with one first magnetic conductor on the side facing the static contact lead end.

[0036] According to some embodiments of the present application, a plurality of the moving blades are arranged side by side along a third direction;

[0037] Among them, the moving direction of the moving blade is defined as a second direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0038] The relay of the embodiment of the present application comprises:

[0039] a pair of stationary contact lead-out ends;

[0040] a plurality of moving contact blades, each of the moving contact blades having two ends respectively for contacting or separating from the pair of stationary contact lead-out ends along a first direction, the first direction being a direction in which the pair of stationary contact lead-out ends are arranged, wherein a contact gap between each of the moving contact blades and the stationary contact lead-out ends is equal; and

[0041] a short-circuit resistance structure for generating an attractive force in a contact closing direction on at least one of the moving contact blades, wherein the attractive force on the at least one of the moving contact blades is less than the attractive force on the remaining moving contact blades.

[0042] According to some embodiments of the present application, the short-circuit resistance structure comprises:

[0043] a first magnetic conductor arranged on a side of the plurality of moving contact blades facing the stationary contact lead-out ends, the first magnetic conductor at least partially overlapping each of the moving contact blades in the contact closing direction; and

[0044] at least one second magnetic conductor, each of the remaining moving contact blades except the moving contact blade with the less attractive force having one of the second magnetic conductors fixedly connected to a side of the moving contact blade facing away from the stationary contact lead-out ends, the first magnetic conductor being configured to form a magnetic return circuit with the at least one second magnetic conductor.

[0045] According to some embodiments of the present application, the short-circuit resistance structure comprises:

[0046] at least one first magnetic conductor arranged on a side of the plurality of moving contact blades facing the stationary contact lead-out ends, the number and position of the at least one first magnetic conductor corresponding to the number and position of the remaining moving contact blades in the contact closing direction; and

[0047] at least one second magnetic conductor, each of the remaining moving contact blades except the moving contact blade with the less attractive force having one of the second magnetic conductors fixedly connected to a side of the moving contact blade facing away from the stationary contact lead-out ends, the corresponding first magnetic conductor and the second magnetic conductor being configured to form a magnetic return circuit.

[0048] According to some embodiments of the present application, the attractive force on one of the moving contact blades is zero.

[0049] According to some embodiments of the present application, the short-circuit resistance structure comprises:

[0050] at least one first magnetic conductor, each of the remaining moving contact blades except the moving contact blade with the less attractive force having one of the first magnetic conductors arranged on a side of the moving contact blade facing the stationary contact lead-out ends.

[0051] According to some embodiments of the present application, the plurality of moving reeds are arranged side by side along a third direction;

[0052] Wherein, the moving direction of the moving reeds is defined as a second direction, the first direction, the second direction and the third direction are perpendicular to each other.

[0053] The above-mentioned one embodiment has at least the following advantages or beneficial effects:

[0054] In the limit breaking process of the relay of the present application, on the one hand, the plurality of moving reeds form a parallel circuit, realizing the effect of current shunting, so that the current value flowing through each moving reed becomes smaller, which is conducive to the breaking of the moving and static contacts; on the other hand, the moving reed with smaller contact gap will break later than the rest of the moving reeds, so that after the rest of the moving reeds break, the moving reed with smaller contact gap is still in contact with the static contact lead. Since the suction force on the moving reed with smaller contact gap is smaller than that on the rest of the moving reeds, when the moving reed with smaller contact gap breaks, it does not need to resist the suction force of the anti-short circuit structure or the suction force is very small, which is conducive to the breaking of the whole relay. When the short-circuit current flows, since the suction force of the anti-short circuit structure acting on the moving reed with smaller contact gap is smaller than that on the rest of the moving reeds, the moving reed with smaller contact gap will be repelled by the electric repulsion between the contacts before the rest of the moving reeds, at this time, the current of the rest of the moving reeds rises, and the instantaneous suction force of the anti-short circuit structure also increases instantaneously, which improves the anti-short circuit ability, so that the suction force on the rest of the moving reeds can play a role in delaying opening, which gains reaction time for the short-circuit breaking of the whole circuit. Therefore, the relay of the present application is conducive to realizing the limit breaking between the contacts, and can realize the delayed opening of the contacts when short-circuiting, which ensures the reliability of the relay and prolongs the service life of the product. BRIEF DESCRIPTION OF DRAWINGS

[0055] Figure 1 is an exploded schematic view of a relay according to an exemplary embodiment.

[0056] Figure 2 is a top view of a sealing unit according to a first exemplary embodiment.

[0057] Figure 3 is Figure 2 a sectional view along A-A in FIG.

[0058] Figure 4 is an exploded schematic view of a sealing unit according to a first exemplary embodiment.

[0059] Figure 5 is a schematic view of the contact gap between two moving reeds and a static contact lead being unequal according to an exemplary embodiment.

[0060] Figure 6 is a schematic view of the contact gap between the two moving contact blades and the lead-out end of the stationary contact according to another exemplary embodiment.

[0061] Figure 7 is a schematic view of one of the two moving contact blades in contact with the lead-out end of the stationary contact and the other moving contact blade not yet in contact according to an exemplary embodiment.

[0062] Figure 8 is a schematic view of both of the two moving contact blades in contact with the lead-out end of the stationary contact according to an exemplary embodiment.

[0063] Figures 9 to 12 are schematic views of the anti-short structure and the plurality of moving contact blades, respectively, of four different embodiments.

[0064] Figure 13 is a top view of a sealing unit according to a second exemplary embodiment.

[0065] Figure 14 is Figure 13 is a sectional view along B-B in FIG. 10.

[0066] Figure 15 is an exploded view of a sealing unit according to a second exemplary embodiment.

[0067] In the drawings, reference numerals: 1. Relay

[0068] 1. Relay

[0069] 10. Housing

[0070] 11. First housing

[0071] 11a. Exposure hole

[0072] 12. Second housing

[0073] 20. Coil unit

[0074] 21. Coil holder

[0075] 22. Coil

[0076] 30. Arc extinguishing unit

[0077] 31. Arc extinguishing magnet

[0078] 32. Yoke clip

[0079] 40. Sealing unit

[0080] 1000. Contact container

[0081] 1001. Contact chamber

[0082] 1002, First Through Hole

[0083] 1100, Insulating Cover

[0084] 1110. Ceramic cover

[0085] 1111, Third Through Hole

[0086] 1120, frame piece

[0087] 1200, yoke plate

[0088] 1210, Second Through Hole

[0089] 2000, stationary contact lead-out terminal

[0090] 2001, Protrusion

[0091] 2002, at the groove

[0092] 3000, moving components

[0093] 3110. Moving reed

[0094] 3200, Push Rod Assembly

[0095] 3210. Push rod

[0096] 3211, Base

[0097] 3212, Pole section

[0098] 3213, Card

[0099] 3220, Contact Support

[0100] 3221. Top Wall

[0101] 3221a, First paragraph

[0102] 3221b, Second paragraph

[0103] 3221c, Bending Section

[0104] 3222, sidewall

[0105] 3223, swivel

[0106] 3300, Flexible Components

[0107] 4000, Magnetic Circuit Section

[0108] 4300, static iron core

[0109] 4310, Through Hole

[0110] 4400, moving iron core

[0111] 4500, Reset component

[0112] 5000, metal cover

[0113] 6000, Short-circuit protection structure

[0114] 6100, First Magnet

[0115] 6200, Second Magnet

[0116] 100. First moving reed

[0117] 200. Second moving reed

[0118] 300. Connectors Detailed Implementation

[0119] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0120] like Figure 1 As shown, the relay 1 in this embodiment includes a housing 10, a coil unit 20, an arc-extinguishing unit 30, and a sealing unit 40. The sealing unit 40 is disposed inside the housing 10, and the top of the stationary contact lead-out end of the sealing unit 40 is exposed to the outer surface of the housing 10 through the exposure hole 11a. Both the coil unit 20 and the arc-extinguishing unit 30 are disposed inside the housing 10.

[0121] It is understood that the terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0122] As an example, the outer casing 10 includes a first casing 11 and a second casing 12, which are connected to form a chamber for accommodating the coil unit 20, the arc-extinguishing unit 30, and the sealing unit 40. In an embodiment of this application, an exposure hole 11a is provided in the first casing 11.

[0123] The arc extinguishing unit 30 is used to extinguish the electric arc generated between the stationary contact lead-out end of the sealing unit 40 and the moving spring.

[0124] As an example, the arc-extinguishing unit 30 includes two arc-extinguishing magnets 31. The arc-extinguishing magnets 31 can be permanent magnets, and each arc-extinguishing magnet 31 can be approximately cuboid in shape. The two arc-extinguishing magnets 31 are respectively disposed on both sides of the sealing unit 40 and are arranged opposite each other along the length direction of the moving spring.

[0125] By setting two opposing arc-extinguishing magnets 31, a magnetic field can be formed around the stationary contact lead-out end and the moving spring. Therefore, the electric arc generated between the stationary contact lead-out end and the moving spring is elongated in a direction away from each other by the action of the magnetic field, thus extinguishing the arc.

[0126] The arc-extinguishing unit 30 also includes two yoke clips 32, which are positioned corresponding to the two arc-extinguishing magnets 31. Furthermore, the two yoke clips 32 surround the sealing unit 40 and the two arc-extinguishing magnets 31. This design of the yoke clips 32 surrounding the arc-extinguishing magnets 31 prevents the magnetic field generated by the arc-extinguishing magnets 31 from spreading outwards and affecting the arc-extinguishing effect. The yoke clips 32 are made of soft magnetic material. Soft magnetic materials can include, but are not limited to, iron, cobalt, nickel, and their alloys.

[0127] like Figures 2 to 4 As shown, the sealing unit 40 includes a contact container 1000, a pair of stationary contact leads 2000, a moving component 3000, and a magnetic circuit portion 4000.

[0128] It should be noted that the contact container 1000 is a stationary component, a device used to house the contact assembly, which is mainly a housing and has a chamber. Furthermore, the contact container 1000 can be assembled from multiple components connected in a predetermined assembly manner.

[0129] The contact container 1000 has a contact chamber 1001 inside. The contact container 1000 may include an insulating cover 1100 and a yoke plate 1200. The insulating cover 1100 covers one side surface of the yoke plate 1200, and the insulating cover 1100 and the yoke plate 1200 together form the contact chamber 1001.

[0130] The insulating cover 1100 includes a ceramic cover 1110 and a frame plate 1120. The ceramic cover 1110 is connected to the yoke plate 1200 via the frame plate 1120. The frame plate 1120 can be a ring-shaped metal component, such as an iron-nickel alloy, and one end of the frame plate 1120 is connected to the opening edge of the ceramic cover 1110, for example, by laser welding, brazing, resistance welding, or adhesive bonding. The other end of the frame plate 1120 is connected to the yoke plate 1200, also by laser welding, brazing, resistance welding, or adhesive bonding. The frame plate 1120 positioned between the ceramic cover 1110 and the yoke plate 1200 facilitates their connection.

[0131] The contact container 1000 also has a pair of first through holes 1002 which are in communication with the contact chamber 1001. The first through holes 1002 are used for the static contact lead- throughs 2000 to pass through. In the embodiment of the present application, the first through holes 1002 are formed in the ceramic cover 1110.

[0132] A pair of static contact lead- throughs 2000 are connected to the ceramic cover 1110 of the contact container 1000, and at least a portion of each static contact lead- through 2000 is located in the contact chamber 1001. One of the pair of static contact lead- throughs 2000 serves as a terminal for current inflow, and the other serves as a terminal for current outflow.

[0133] The pair of static contact lead- throughs 2000 are correspondingly passed through the pair of first through holes 1002 and connected to the ceramic cover 1110, for example, by welding.

[0134] The bottom of the static contact lead- through 2000 serves as a static contact, which can be integrally or separately provided on the bottom of the static contact lead- through 2000.

[0135] Please continue to refer to Figure 3 and Figure 4 The moving assembly 3000 includes a plurality of moving spring leaves 3110 arranged side by side, a push rod assembly 3200, and an elastic assembly 3300. The plurality of moving spring leaves 3110 are arranged in the insulating cover 1100 and are mounted on the push rod assembly 3200 through the elastic assembly 3300. Each moving spring leaf 3110 has two ends along a first direction D1 for contacting or separating from the pair of static contact lead- throughs 2000, respectively. The first direction D1 is the arrangement direction of the pair of static contact lead- throughs 2000. It can be understood that the plurality of moving spring leaves 3110 are arranged side by side, and thus the number of contact points formed between the plurality of moving spring leaves 3110 and each static contact lead- through 2000 is a plurality, for example, two, three, four, etc.

[0136] It should be noted that if the pair of static contact lead- throughs 2000 and the plurality of moving spring leaves 3110 are regarded as a set of combination, then the relay of the embodiment of the present application can include a plurality of sets of combination. Each moving spring leaf 3110 can include a moving spring body and moving contacts arranged at both ends of the moving spring body. The moving contacts can be separate parts and connected to the moving spring body. Of course, the moving contacts can also be integrally formed on the moving spring body.

[0137] In this embodiment of the application, the moving assembly 3000 includes two moving springs 3110 arranged side by side. One end of each moving spring 3110 is used to contact or separate from the stationary contact of one of the stationary contact leads 2000, and the other end of each moving spring 3110 is used to contact or separate from the stationary contact of the other stationary contact lead 2000. Further, one end of each moving spring 3110 forms two contact points with one of the stationary contact leads 2000, and the other end of each moving spring 3110 forms two contact points with the other stationary contact lead 2000.

[0138] In other embodiments, the number of movable reeds 3110 may be three, four, five, etc.

[0139] It is understood that the moving assembly 3000 includes multiple moving springs 3110. The two ends of each moving spring 3110 along the first direction D1 respectively contact or separate from a pair of stationary contact leads. Since the multiple moving springs 3110 do not restrict each other, a reliable parallel circuit is formed after the two ends of each moving spring 3110 along the first direction D1 contact a pair of stationary contact leads 2000. The number of contact points formed by the multiple moving springs 3110 and one stationary contact lead 2000 is greater than or equal to two, achieving a current shunting effect. Furthermore, according to the principle that the magnitude of the electric repulsion force is proportional to the square of the current, the magnitude of the electric repulsion force at each contact is significantly reduced, which is beneficial to improving the short-circuit withstand capability and enhancing the reliability of the relay.

[0140] like Figure 3 and Figure 4 As shown, the direction of movement of the movable spring 3110 is defined as the second direction D2, and the direction perpendicular to the first direction D1 and the second direction D2 is defined as the third direction D3. The push rod assembly 3200 includes a push rod 3210 and a contact support 3220. The contact support 3220 includes a top wall 3221 and two side walls 3222. One end of each side wall 3222 is integrally connected to the two sides of the top wall 3221 along the third direction D3, and the other end of each side wall 3222 is connected to the push rod 3210. Multiple movable springs 3110 are mounted in the space enclosed by the contact support 3220 via an elastic assembly 3300. Of course, in other embodiments, one end of each side wall 3222 can also be separately connected to the two sides of the top wall 3221 along the third direction D3.

[0141] The bottom end of each side wall 3222 of the contact holder 3220 is provided with a clamping hole 3223. The push rod 3210 includes a base 3211 and a rod portion 3212, the base 3211 being connected to an axial end of the rod portion 3212. The base 3211 is provided with two clamping pieces 3213 on two sides thereof, the two clamping pieces 3213 being clamped into the two clamping holes 3223 of the contact holder 3220 respectively, so as to fix the base 3211 to the contact holder 3220. The elastic assembly 3300 is arranged between the plurality of movable spring pieces 3110 and the base 3211, and is used to apply an elastic force to the plurality of movable spring pieces 3110 in a direction towards the top wall 3221, so as to provide a contact pressure.

[0142] It can be understood that the elastic assembly 3300 can be used to flexibly support the plurality of movable spring pieces 3110, and provide the contact pressure.

[0143] Of course, in other embodiments, the push rod assembly 3200 can also adopt other structures, which will not be described herein.

[0144] The plurality of movable spring pieces 3110 are arranged side by side along a third direction D3.

[0145] Please refer to Figure 3 and Figure 4 The yoke plate 1200 has a second through hole 1210, the second through hole 1210 penetrating through two opposite sides of the yoke plate 1200 along the thickness direction of the yoke plate 1200, and the second through hole 1210 is in communication with the contact chamber 1001 of the contact container 1000. The rod portion 3212 is movably arranged in the second through hole 1210 in an axial direction. The base 3211 at an axial end of the rod portion 3212 is arranged in the contact chamber 1001.

[0146] The sealing unit 40 further includes a metal cover 5000, the metal cover 5000 being connected to a side of the yoke plate 1200 away from the insulating cover 1100, and the metal cover 5000 covering the second through hole 1210 on the yoke plate 1200. The metal cover 5000 and the yoke plate 1200 form a chamber for accommodating the static core 4300 and the movable core 4400 of the magnetic circuit portion 4000.

[0147] Please refer to Figure 1 The coil unit 20 includes a coil holder 21 and a coil 22, the coil holder 21 being in a hollow cylindrical shape and being formed of an insulating material. The metal cover 5000 is arranged in the coil holder 21. The coil 22 surrounds the coil holder 21.

[0148] As Figure 3 and Figure 4As shown, the magnetic circuit part 4000 includes a static core 4300, a moving core 4400, and a reset member 4500. The static core 4300 is fixedly arranged in the metal shell 5000, and part of the static core 4300 extends into the second through hole 1210. The static core 4300 has a through hole 4310 arranged corresponding to the position of the second through hole 1210, for the rod part 3212 to pass through. The moving core 4400 is movably arranged in the metal shell 5000, and is arranged opposite to the static core 4300 along the axial direction of the rod part 3212. The moving core 4400 is connected to the rod part 3212, for being attracted by the static core 4300 when the coil 22 is energized. The moving core 4400 and the rod part 3212 can be connected by screwing, riveting, welding or other means.

[0149] The reset member 4500 is located inside the metal shell 5000, and is arranged between the static core 4300 and the moving core 4400, for resetting the moving core 4400 when the coil 22 is de-energized. The reset member 4500 can be a spring, and is sleeved on the outside of the rod part 3212.

[0150] It should be noted that when the coil 22 is energized, the magnetic circuit part 4000 can drive the push rod assembly 3200 to move upward through the rod part 3212. When the moving contact piece 3110 contacts the static contact lead-out end 2000, the moving contact piece 3110 is stopped by the static contact lead-out end 2000, while the rod part 3212 and the base 3211 will continue to move upward until the overstroke is completed.

[0151] As shown in FIGS. Figure 3 and Figure 4 The relay 1 further includes an anti-short circuit structure 6000, for forming an attractive force on at least one of the moving contact pieces 3110 in the direction of contact closing. The attractive force can resist the electrodynamic repulsive force between the moving contact piece 3110 and the static contact lead-out end 2000 due to the short circuit current, to prevent the moving contact piece 3110 and the static contact lead-out end 2000 from bouncing apart.

[0152] Among the plurality of moving contact pieces 3110, the contact gap between at least one of the moving contact pieces 3110 and the static contact lead-out end 2000 is smaller than the contact gap between the remaining moving contact pieces 3110 and the static contact lead-out end 2000. The attractive force on the moving contact piece 3110 with the smaller contact gap is smaller than the attractive force on each of the remaining moving contact pieces 3110.

[0153] It should be noted that the attractive force on the moving contact piece 3110 with the smaller contact gap being smaller than the attractive force on each of the remaining moving contact pieces 3110 can include the following cases: the attractive force on the moving contact piece 3110 with the smaller contact gap is zero; or, the attractive force on each of the moving contact pieces 3110 is greater than 0, and the attractive force on the moving contact piece 3110 with the smaller contact gap is smaller than the attractive force on each of the remaining moving contact pieces 3110.

[0154] It should be noted that when the number of moving springs 3110 is three or more, the contact gap between one moving spring 3110 and the stationary contact lead-out end 2000 is the smallest, while the contact gaps between the remaining moving springs 3110 and the stationary contact lead-out end 2000 can be equal or unequal. Furthermore, the moving spring 3110 with the smallest contact gap has the smallest suction force, while the suction forces on the remaining moving springs 3110 can be equal or unequal.

[0155] Furthermore, when the number of moving springs 3110 is greater than or equal to three, the contact gaps between two of the moving springs 3110 and the stationary contact lead-out end 2000 can be equal and minimal, while the contact gap between the remaining moving spring 3110 and the stationary contact lead-out end 2000 is greater than the contact gaps between the two moving springs 3110.

[0156] Regarding how to design unequal contact gaps between multiple moving springs 3110, the following methods can be used: Figure 5 and Figure 6 As shown in the diagram.

[0157] For ease of explanation, the following example uses two moving springs 3110. The two moving springs 3110 are defined as the first moving spring 100 and the second moving spring 200, respectively. The contact gap between the first moving spring 100 and the stationary contact lead-out end 2000 is smaller than the contact gap between the second moving spring 200 and the stationary contact lead-out end 2000. Furthermore, the suction force on the first moving spring 100 is zero, or the suction force on the first moving spring 100 is not zero and is less than the suction force on the second moving spring 200.

[0158] like Figure 5 As shown, the bottom surface of the stationary contact lead-out end 2000 is a plane. The thicknesses of the first moving spring 100 and the second moving spring 200 are not equal. For example, the thickness of the first moving spring 100 is greater than the thickness of the second moving spring 200, which makes the contact gap t1 between the first moving spring 100 and the stationary contact lead-out end 2000 smaller than the contact gap t2 between the second moving spring 200 and the stationary contact lead-out end 2000.

[0159] like Figure 6 As shown, the bottom surface of the stationary contact lead-out end 2000 is a stepped surface. For example, the protrusion 2001 of the stepped surface corresponds to the first moving spring 100, and the groove 2002 of the stepped surface corresponds to the second moving spring 200, so that the contact gap t1 between the first moving spring 100 and the protrusion 2001 is smaller than the contact gap t2 between the second moving spring 200 and the groove 2002.

[0160] The following is based on Figure 5 The illustrated embodiment is used as an example, and in conjunction with Figure 7 andFigure 8 The first moving spring 100 and the second moving spring 200 have different on-off sequences when the contact gap between the first moving spring 100 and the second moving spring 200 and the static contact lead-out end 2000 is different.

[0161] In the closing process, since the gap between the moving iron core 4400 and the static iron core 4300 is a certain value, when the push rod assembly 3200 drives the first moving spring 100 and the second moving spring 200 to move towards the static contact lead-out end 2000 at the same time, the contact gap of the first moving spring 100 is smaller, so the first moving spring 100 contacts the static contact lead-out end 2000 before the second moving spring 200, that is, the first moving spring 100 with smaller contact gap is turned on first. At this time, the second moving spring 200 has not contacted the static contact lead-out end 2000 (as shown in Figure 7 ).

[0162] Then, the push rod assembly 3200 continues to move towards the static contact lead-out end 2000, since the first moving spring 100 has contacted the static contact lead-out end 2000 and cannot continue to move at this time, so at this stage, only the second moving spring 200 moves towards the static contact lead-out end 2000 until the second moving spring 200 also contacts the static contact lead-out end 2000 (as shown in Figure 8 ). At this time, the moving iron core 4400 has not contacted the static iron core 4300. In the process of moving the second moving spring 200 from the position shown in Figure 7 to the position shown in Figure 8 , the first moving spring 100 does not move all the time, but is in the over-travel stage.

[0163] After the first moving spring 100 and the second moving spring 200 both contact the static contact lead-out end 2000, the moving iron core 4400 will continue to move for a distance until the moving iron core 4400 contacts the static iron core 4300. In this stage of the moving iron core 4400 continuing to move, the first moving spring 100 and the second moving spring 200 do not continue to move, at this time, the first moving spring 100 and the second moving spring 200 are both in the over-travel stage.

[0164] Therefore, the over-travel distance of the first moving spring 100 is greater than the over-travel distance of the second moving spring 200.

[0165] In the breaking process, the first moving spring 100 and the second moving spring 200 can be sequentially turned off according to Figures 8 to 7 to Figure 5The breaking process is the process of releasing the over-travel and the contact gap for the first moving contact 100 and the second moving contact 200. Since the contact gap of the first moving contact 100 is smaller, the over-travel distance of the first moving contact 100 is larger. Therefore, the second moving contact 200 will break before the first moving contact 100 in the breaking process, i.e. the first moving contact 100 with the smaller contact gap will break later.

[0166] Therefore, it can be concluded that the first moving contact 100 will connect before the second moving contact 200 in the closing process, and the second moving contact 200 will break before the first moving contact 100 in the breaking process.

[0167] The breaking process of the two moving contacts 3110 when the two moving contacts 3110 respectively pass the limit breaking current and the short-circuit current will be described in detail below. The two moving contacts 3110 are respectively the first moving contact 100 and the second moving contact 200.

[0168] When passing the limit breaking current (for example, 2kA), the first moving contact 100 and the second moving contact 200 form a parallel circuit, so the first moving contact 100 and the second moving contact 200 both pass 1kA of current. Since the second moving contact 200 will break before the first moving contact 100 in the breaking process, when the second moving contact 200 just breaks, the first moving contact 100 will still be in contact with the static contact lead-out end 2000, so that 2kA of current will all flow into the first moving contact 100. Since the suction force of the anti-short-circuit structure 6000 acting on the first moving contact 100 is zero or small, the breaking process of the first moving contact 100 does not need to resist the suction force of the anti-short-circuit structure 6000 or resist a small suction force, which is conducive to the breaking of the whole relay.

[0169] When the short-circuit current (for example, 20kA) flows, the first moving contact 100 and the second moving contact 200 constitute a parallel circuit, and thus the first moving contact 100 and the second moving contact 200 both flow 10kA of current. Since the suction force of the anti-short-circuit structure 6000 acting on the first moving contact 100 is less than the suction force acting on the second moving contact 200, the first moving contact 100 is preferentially repelled by the electric repulsion force between the contacts, and thus the current in the first moving contact 100 gradually changes from 10kA to 0kA, and the current in the second moving contact 200 gradually changes from 10kA to 20kA. Since the current in the second moving contact 200 gradually increases from 10kA to 20kA, the current gradually increases, and thus the electric repulsion force between the second moving contact 200 and the contact lead-out end 2000 of the static contact gradually increases, so that the suction force of the anti-short-circuit structure 6000 acting on the second moving contact 200 can resist a certain electric repulsion force, thereby playing a role of delaying disconnection, and gaining reaction time for short-circuit disconnection of the entire circuit.

[0170] Therefore, the relay according to the embodiments of the present application can realize the limit breaking between the contacts and the delayed disconnection of the contacts during short circuit, thereby ensuring the reliability of the relay and prolonging the service life of the product.

[0171] Please refer back to Figure 3 and Figure 4 The anti-short-circuit structure 6000 includes a first magnetic conductor 6100 and at least one second magnetic conductor 6200. The first magnetic conductor 6100 is arranged on the side of the plurality of moving contacts 3110 facing the static contact lead-out end 2000, and the first magnetic conductor 6100 at least partially overlaps each moving contact 3110 in the contact closing direction. The side of the plurality of moving contacts 3110 facing away from the static contact lead-out end 2000 of the remaining moving contacts 3110 except the moving contact 3110 with a small contact gap is fixedly connected with a second magnetic conductor 6200, and the first magnetic conductor 6100 is used to form a magnetic conducting loop with the at least one second magnetic conductor 6200.

[0172] When the number of the moving contacts 3110 is two, the first moving contact 100 is not connected with the second magnetic conductor 6200, and the side of the second moving contact 200 facing away from the static contact lead-out end 2000 is fixedly connected with a second magnetic conductor 6200.

[0173] When the first moving reed 100 and the second moving reed 200 are energized, for the first moving reed 100, the first magnetic conductor 6100 corresponding to the position of the first moving reed 100 is magnetized, thereby forming an attractive force on the first moving reed 100 in the direction of closing the contact; for the second moving reed 200, a magnetic circuit is formed between the first magnetic conductor 6100 and the second magnetic conductor 6200 on both sides of the second moving reed 200. When the short-circuit current passes through the second moving reed 200, an attractive force in the direction of the contact pressure is generated between the first magnetic conductor 6100 and the second magnetic conductor 6200, which can resist the electrodynamic repulsion between the second moving reed 200 and the static contact lead-out end 2000 due to the short-circuit current.

[0174] It should be noted that the first magnetic conductor 6100 and the second magnetic conductor 6200 are respectively located on the side of the moving reed 3110 facing the static contact lead-out end 2000 and the side of the moving reed 3110 facing away from the static contact lead-out end 2000, so the attractive force between the first magnetic conductor 6100 and the second magnetic conductor 6200 is a direct electromagnetic attractive force, which can more effectively resist the electrodynamic repulsion between the second moving reed 200 and the static contact lead-out end 2000 due to the short-circuit current. In other words, the attractive force of the anti-short-circuit structure 6000 acting on the first moving reed 100 is smaller than the attractive force acting on the second moving reed 200. That is, the attractive force on the moving reed 3110 with a smaller contact gap is smaller than the attractive force on the remaining moving reeds 3110.

[0175] It can be understood that the first magnetic conductor 6100 and the second magnetic conductor 6200 can be in the shape of a letter or a U, and the first magnetic conductor 6100 and the second magnetic conductor 6200 can be made of soft magnetic materials such as iron, cobalt, nickel, and alloys thereof.

[0176] Optionally, for the first magnetic conductor 6100, it can include a plurality of stacked magnetic conductive sheets. It can be understood that by increasing the number of magnetic conductive sheets with a relatively small thickness, the overall thickness of the first magnetic conductor 6100 can be increased. On the one hand, the magnetic conductive sheets with a relatively small thickness can be made of thin strips, so the material cost is relatively low and easy to operate. On the other hand, the number of magnetic conductive sheets can be flexibly adjusted according to the size of the short-circuit current.

[0177] Of course, in other embodiments, in order to make the attractive force on the first moving reed 100 smaller than the attractive force on the second moving reed 200, the side of the first moving reed 100 and the side of the second moving reed 200 facing away from the static contact lead-out end 2000 can be connected with the second magnetic conductor 6200, but the thickness of the second magnetic conductor 6200 connected with the first moving reed 100 needs to be smaller than the thickness of the second magnetic conductor 6200 connected with the second moving reed 200.

[0178] As Figure 3 and Figure 4As shown, the first magnetic conductor 6100 is fixedly arranged relative to the contact container 1000. In this way, the suction force of the short-circuit resistance structure 6000 is transferred to the contact container 1000, and since the contact container 1000 is a stationary component, excessive coil holding force is not required, thereby reducing the power consumption of the coil of the relay and the volume of the relay, and improving the short-circuit resistance capability.

[0179] Further, the first magnetic conductor 6100 is connected to the ceramic cover 1110 of the insulating cover 1100 through the connecting piece 300. The ceramic cover 1110 of the insulating cover 1100 is provided with a third through hole 1111; the connecting piece 300 is in the shape of a rod and is arranged through the third through hole 1111; one end of the connecting piece 300 is connected to the insulating cover 1100, and the other end is connected to the first magnetic conductor 6100.

[0180] The connecting mode of the axial end of the connecting piece 300 to the ceramic cover 1110 can have various embodiments, such as welding, riveting, screwing, and bonding. The connecting mode of the other end of the connecting piece 300 to the first magnetic conductor 6100 can also have various embodiments, such as welding, riveting, screwing, bonding, and clamping.

[0181] It can be understood that when the connecting mode of one end of the connecting piece 300 to the ceramic cover 1110 is welding, by welding the connecting piece 300 to the top wall of the ceramic cover 1110, a metal layer can be processed only around the third through hole 1111 on the outer wall surface of the top wall, and there is no need to process a metal layer on the inner wall surface of the top wall, which is convenient for processing and simplifies the processing steps.

[0182] It can be understood that one end of the connecting piece 300 can be connected to the outer wall surface of the ceramic cover 1110, or to the inner wall surface of the ceramic cover 1110, or to both the outer wall surface and the inner wall surface of the ceramic cover 1110.

[0183] As can be seen, the first magnetic conductor 6100 is connected to the ceramic cover 1110 through the connecting piece 300. On the one hand, the suction force of the short-circuit resistance is transferred to the ceramic cover 1110, so that excessive coil holding force is not required, thereby reducing the power consumption of the coil of the relay and the volume of the relay, and improving the short-circuit resistance capability; on the other hand, since the connecting piece 300 is connected to the ceramic cover 1110, it does not excessively occupy the space of the contact chamber, thereby ensuring the arc extinguishing space of the arc extinguishing assembly and the movement space of the push rod.

[0184] In addition, the first magnetic conductor 6100 is connected to the connecting piece 300 in the shape of a rod, so that various connecting modes, such as riveting, laser welding, clamping, and gluing, can be used between the first magnetic conductor 6100 and the connecting piece 300, thereby enriching the connecting modes.

[0185] As an example, the connecting piece 300 is a solid rod. In this way, the connecting piece 300 and the first magnetic conductor 6100 can be connected by riveting, so that the connection is more reliable. In addition, the support strength of the solid rod is higher and is less likely to deform.

[0186] Of course, the first magnetic conductor 6100 can also be fixedly arranged in the contact container 1000 by a fixed support (not shown in the figure). Specifically, the fixed support is arranged in the contact container 1000 and fixedly connected with the yoke plate 1200, and the first magnetic conductor 6100 is fixedly connected with the fixed support.

[0187] In addition, in yet another embodiment, the distance between the first magnetic conductor 6100 and the second magnetic conductor 6200 can be designed to be variable. Specifically, the distance between the first magnetic conductor 6100 and the second magnetic conductor 6200 can be adjusted according to the size of the current value, thereby changing the magnetic attraction force generated between the first magnetic conductor 6100 and the second magnetic conductor 6200. In addition to meeting the anti-short circuit requirement, it can also meet the overload breaking requirement.

[0188] In an embodiment, the elastic assembly 3300 can be a compression spring or a leaf spring. In addition, the number of compression springs or leaf springs can be one or more. The number of multiple compression springs or multiple leaf springs can be the same as the number of multiple moving spring leaves.

[0189] The following will be described in combination with Figures 9 to 12 The schematic diagrams of the anti-short circuit structure 6000 and the multiple moving spring leaves 3110 of four different embodiments are shown respectively.

[0190] As shown in Figure 9 , the number of moving spring leaves 3110 includes two, which are respectively a first moving spring leaf 100 and a second moving spring leaf 200. The anti-short circuit structure 6000 includes a first magnetic conductor 6100 in the form of a straight line, which is arranged on one side of the second moving spring leaf 200 facing the static contact lead-out end 2000, but not arranged on one side of the first moving spring leaf 100 facing the static contact lead-out end 2000. In this way, the suction force on the first moving spring leaf 100 can be considered as zero.

[0191] As shown in Figure 10 , the number of moving spring leaves 3110 includes two, which are respectively a first moving spring leaf 100 and a second moving spring leaf 200. The anti-short circuit structure 6000 includes a first magnetic conductor 6100 in the form of a straight line and a second magnetic conductor 6200 in the form of a U-shaped line, the first magnetic conductor 6100 is arranged on one side of the second moving spring leaf 200 facing the static contact lead-out end 2000, and the second magnetic conductor 6200 is arranged on one side of the second moving spring leaf 200 facing away from the static contact lead-out end 2000. In this way, the suction force on the first moving spring leaf 100 can be considered as zero.

[0192] As shown in Figure 11 , the number of moving reeds 3110 includes two, which are the first moving reed 100 and the second moving reed 200. The anti-short circuit structure 6000 includes a first magnetic conductor 6100 in the shape of a U and a second magnetic conductor 6200 in the shape of a straight line. The first magnetic conductor 6100 is arranged on the side of the second moving reed 200 facing the static contact lead-out end 2000, and the second magnetic conductor 6200 is arranged on the side of the second moving reed 200 facing away from the static contact lead-out end 2000. In this way, the suction force on the first moving reed 100 can be considered to be zero.

[0193] As shown in Figure 12 , the number of moving reeds 3110 includes three. The anti-short circuit structure 6000 includes two first magnetic conductors 6100 in the shape of a straight line and two second magnetic conductors 6200 in the shape of a U. The two first magnetic conductors 6100 are arranged on the sides of the two moving reeds 3110 facing the static contact lead-out end 2000, and the two second magnetic conductors 6200 are arranged on the sides of the two moving reeds 3110 facing away from the static contact lead-out end 2000. In this way, the suction force on the remaining one moving reed 3110 can be considered to be zero.

[0194] As shown in Figures 13 to 15 , the sealing unit of the second embodiment has substantially the same structure as the sealing unit of the first embodiment in the basic configuration. Therefore, in the following description of the sealing unit of the second embodiment, the structures already described in the first embodiment will not be repeated. In addition, the same reference numerals are marked for structures that are the same as the structures of the sealing unit described in the first embodiment. Therefore, in the following description of the present embodiment, mainly the differences from the sealing unit of the first embodiment will be described.

[0195] As shown in Figure 14 and Figure 15 , the anti-short circuit structure 6000 includes at least one first magnetic conductor 6100 and at least one second magnetic conductor 6200. The at least one first magnetic conductor 6100 is arranged on the side of the plurality of moving reeds 3110 facing the static contact lead-out end 2000. In the contact closing direction, the number and position of the at least one first magnetic conductor 6100 correspond to the number and position of the remaining moving reeds 3110, respectively. The side of the plurality of moving reeds 3110, except for the moving reed 3110 with a small contact gap, facing away from the static contact lead-out end 2000 is fixedly connected with one second magnetic conductor 6200. The corresponding first magnetic conductor 6100 and second magnetic conductor 6200 are used to form a magnetic conducting loop.

[0196] When the number of the moving spring pieces 3110 is two, the anti-short circuit structure 6000 comprises a first magnetic conductor 6100 and a second magnetic conductor 6200, the first magnetic conductor 6100 is arranged on the side of the second moving spring piece 200 facing the static contact lead-out end 2000, and is not arranged on the side of the first moving spring piece 100 facing the static contact lead-out end 2000. The second magnetic conductor 6200 is fixedly arranged on the side of the second moving spring piece 200 facing away from the static contact lead-out end 2000. Since the first moving spring piece 100 is not provided with the first magnetic conductor 6100 and the second magnetic conductor 6200, the suction force on the first moving spring piece 100 can be considered as zero.

[0197] Please continue to refer to Figure 14 and Figure 15 , at least one first magnetic conductor 6100 is mounted on the push rod assembly 3200. Further, the at least one first magnetic conductor 6100 is connected to the side surface of the top wall 3221 of the contact support 3220 facing the push rod 3210.

[0198] The top wall 3221 comprises a first section 3221a, a second section 3221b and a bent section 3221c, the bent section 3221c is connected to the first section 3221a and is bent away from the push rod 3210 to be connected to the second section 3221b; one end of the two side walls 3222 is respectively connected to the first section 3221a and the second section 3221b. The at least one first magnetic conductor 6100 is connected to the side surface of the second section 3221b facing the push rod 3210, and the side surface of the at least one first magnetic conductor 6100 facing the push rod 3210 is flush with the side surface of the first section 3221a facing the push rod 3210.

[0199] As a variant, the application also provides a relay, which is different from the relay of the above-mentioned embodiment in that:

[0200] The contact gaps between each moving spring piece 3110 and the static contact lead-out end 2000 are equal; the anti-short circuit structure 6000 is used to form a suction force on at least one moving spring piece 3110 in the direction of closing the contact; wherein the suction force on at least one moving spring piece 3110 is smaller than the suction force on the remaining moving spring pieces 3110.

[0201] It should be noted that the suction force on at least one moving spring piece 3110 being smaller than the suction force on the remaining moving spring pieces 3110 can include the following cases: the suction force on at least one moving spring piece 3110 is zero; or, the suction force on each moving spring piece 3110 is greater than 0, and the suction force on at least one moving spring piece 3110 is smaller than the suction force on the remaining moving spring pieces 3110.

[0202] For example, when the number of moving contact springs 3110 is greater than or equal to three, the suction force on one or two moving contact springs 3110 can be zero, and the suction force on the remaining one or two moving contact springs 3110 is greater than zero; the suction force on each moving contact spring 3110 can be greater than zero, and the suction force on one moving contact spring 3110 is less than the suction force on the remaining two moving contact springs 3110, and the suction force on the remaining two moving contact springs 3110 can be equal or not equal; or the suction force on each moving contact spring 3110 is greater than zero, and the suction force on two moving contact springs 3110 is equal and less than the suction force on the remaining one moving contact spring 3110.

[0203] As Figures 9 to 11 For convenience of description, the number of moving contact springs 3110 is taken as two below, the two moving contact springs 3110 are defined as a first moving contact spring 100 and a second moving contact spring 200, the contact gap between the first moving contact spring 100 and the static contact lead-out end 2000 is equal to the contact gap between the second moving contact spring 200 and the static contact lead-out end 2000, and the suction force on the first moving contact spring 100 is less than the suction force on the second moving contact spring 200.

[0204] Since the contact gap between the first moving contact spring 100 and the static contact lead-out end 2000 is equal to the contact gap between the second moving contact spring 200 and the static contact lead-out end 2000, the first moving contact spring 100 and the second moving contact spring 200 are connected at the same time in the closing process, and the first moving contact spring 100 and the second moving contact spring 200 are disconnected at the same time in the breaking process.

[0205] When the on-state limit breaking current (for example, 2kA) is passed, the first moving contact spring 100 and the second moving contact spring 200 form a parallel circuit, so that the first moving contact spring 100 and the second moving contact spring 200 pass 1kA of current. After shunting, the current flowing through the first moving contact spring 100 and the second moving contact spring 200 becomes small, so that the suction force of the anti-short-circuit structure 6000 acting on the first moving contact spring 100 and the second moving contact spring 200 becomes small, which is beneficial to timely breaking.

[0206] When the short-circuit current (for example, 20kA) flows, the first moving spring piece 100 and the second moving spring piece 200 constitute a parallel circuit, and thus the first moving spring piece 100 and the second moving spring piece 200 both flow 10kA of current. Since the suction force on the first moving spring piece 100 is less than the suction force on the second moving spring piece 200, the first moving spring piece 100 is preferentially repelled by the electric repulsion force between the contacts, and thus the current in the first moving spring piece 100 gradually changes from 10kA to 0kA, and the current in the second moving spring piece 200 gradually changes from 10kA to 20kA. Since the current in the second moving spring piece 200 gradually increases from 10kA to 20kA, the current gradually increases, and thus the electric repulsion force between the second moving spring piece 200 and the contact lead end 2000 of the static contact gradually increases, so that the suction force of the short-circuit resistance structure 6000 acting on the second moving spring piece 200 can resist a certain electric repulsion force, and thus the second moving spring piece 200 can be delayed to be disconnected, and thus the reaction time for the short-circuit disconnection of the entire circuit is obtained.

[0207] Therefore, the relay provided by the embodiments of the present application also has the advantages of facilitating the realization of the limit breaking between the contacts and the realization of the delayed disconnection of the contacts during the short circuit, and thus the reliability of the relay is ensured, and the service life of the product is prolonged.

[0208] It can be understood that the various embodiments / embodiments provided by the present application can be combined with each other without contradiction, and will not be illustrated one by one here.

[0209] In the embodiments of the present application, the terms "first", "second", "third" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected; "connected" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0210] In the description of the embodiments of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and thus cannot be understood as indicating or implying that the devices or units referred to must have a particular direction, be constructed and operated in a particular orientation, and thus cannot be understood as limiting the embodiments of the present application.

[0211] In the description of the application, the terms "one embodiment", "some embodiments", "certain embodiments", etc. indicate that the described features, structures, materials, or characteristics are included in at least one embodiment of the application. The illustrative examples of the above terms are not necessarily mutually exclusive and are not necessarily mutually inclusive. Moreover, the described features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0212] The above description is merely illustrative of the application, and is not intended to limit the application. The application can be modified and varied greatly without departing from the spirit or scope of the application, as set forth in the following claims.

Claims

1. A relay, characterized in that, include: A pair of stationary contact leads; Multiple movable reeds, each of which has two ends along a first direction for contacting or separating from a pair of stationary contact leads; The first direction is the arrangement direction of the pair of stationary contact leads; wherein, the contact gap between at least one of the plurality of moving springs and the stationary contact lead is smaller than the contact gap between the remaining moving springs and the stationary contact lead; and A short-circuit protection structure is provided for generating a suction force in the contact closing direction on at least one of the moving springs; wherein the suction force on the moving spring with the smaller contact gap is less than the suction force on the other moving springs.

2. The relay according to claim 1, characterized in that, The short-circuit protection structure includes: A first magnetic conductor is disposed on one side of the plurality of moving reeds facing the exit end of the stationary contact; along the contact closing direction, the first magnetic conductor at least partially overlaps with each of the moving reeds; and At least one second magnetic conductor is provided. Except for the moving spring with a smaller contact gap, the remaining moving springs are all fixedly connected to a second magnetic conductor on the side facing away from the stationary contact lead-out end. The first magnetic conductor is used to form a magnetic circuit with at least one second magnetic conductor.

3. The relay according to claim 2, characterized in that, The relay further includes a contact container, the contact container having a pair of first through holes, and a pair of stationary contact leads passing through the pair of first through holes respectively; a plurality of moving springs are disposed inside the contact container; The first magnetic conductor is disposed inside the contact container and is fixedly disposed relative to the contact container.

4. The relay according to claim 3, characterized in that, The contact container includes: Yoke plate; and An insulating cover is provided on one side surface of the yoke plate, and the insulating cover has a pair of first through holes; the first magnetic conductor is connected to the insulating cover by a connector.

5. The relay according to claim 4, characterized in that, The insulating cover is provided with a third through hole; The connector is rod-shaped and passes through the third through hole; one end of the connector is connected to the insulating cover, and the other end is connected to the first magnetic conductor.

6. The relay according to claim 4, characterized in that, The insulating cover includes a ceramic cover and a frame plate, wherein the ceramic cover is connected to the yoke plate through the frame plate; The ceramic cover is provided with a pair of first through holes; the first magnetic conductor is connected to the ceramic cover through the connector.

7. The relay according to claim 1, characterized in that, The short-circuit protection structure includes: At least one first magnetic conductor is disposed on one side of the plurality of moving reeds facing the stationary contact lead-out end; along the contact closing direction, the number and position of at least one first magnetic conductor correspond to the number and position of the remaining moving reeds, respectively; and At least one second magnetic conductor is provided. Among the plurality of moving springs, except for the moving spring with a smaller contact gap, the remaining moving springs are all fixedly connected to a second magnetic conductor on the side facing away from the stationary contact lead-out end. The corresponding first magnetic conductor and second magnetic conductor are used to form a magnetic circuit.

8. The relay according to claim 7, characterized in that, The relay also includes: A push rod assembly in which multiple movable springs are mounted via an elastic assembly, the elastic assembly being used to provide contact pressure to the multiple movable springs; Multiple of the first magnetic conductors are mounted on the push rod assembly.

9. The relay according to claim 8, characterized in that, The direction of motion of the movable spring is defined as the second direction; the push rod assembly includes: Push lever; The contact support includes a top wall and two side walls. One end of each of the two side walls is connected to both sides of the top wall along a third direction, and the other end of each of the two side walls is connected to the push rod. The first direction, the second direction, and the third direction are perpendicular to each other. Among them, a plurality of the first magnetic conductors are connected to the top wall.

10. The relay according to claim 9, characterized in that, The top wall includes a first section, a second section, and a bent section. The bent section is connected to the first section and bends from the first section away from the push rod to connect to the second section. One end of each of the two side walls is connected to the first section and the second section, respectively. At least one of the first magnetic conductors is connected to the side surface of the second segment facing the push rod, and the side surface of at least one of the first magnetic conductors facing the push rod is flush with the side surface of the first segment facing the push rod.

11. The relay according to claim 1, characterized in that, The suction force on the moving spring with a small contact gap is zero.

12. The relay according to claim 11, characterized in that, The short-circuit protection structure includes: At least one first magnetic conductor is provided, and among the plurality of moving springs, except for the moving spring with a smaller contact gap, the remaining moving springs are each provided with a first magnetic conductor on the side facing the stationary contact lead-out end.

13. The relay according to claim 1, characterized in that, Multiple moving springs are arranged side by side along a third direction; The direction of motion of the movable spring is defined as the second direction, and the first direction, the second direction, and the third direction are perpendicular to each other.

14. The relay according to claim 1, characterized in that, The bottom surface of the stationary contact lead-out end is a plane, and the thickness of at least one of the moving springs is less than the thickness of the other moving springs.

15. The relay according to claim 1, characterized in that, The bottom surface of the stationary contact lead-out end is a stepped surface. The protrusions of the stepped surface correspond to the moving springs with smaller contact gaps, and the grooves of the stepped surface correspond to the remaining moving springs.

16. The relay according to claim 1, characterized in that, The short-circuit protection structure includes: At least one first magnetic conductor is located on the side of the plurality of moving reeds facing the stationary contact lead-out end; and Multiple second magnetic conductors are respectively fixedly connected to the side of the multiple moving springs facing away from the stationary contact lead-out end, and the first magnetic conductor is used to form a magnetic circuit with the second magnetic conductors; The thickness of the second magnetic conductor on the moving spring with the smaller contact gap is less than the thickness of the second magnetic conductor on each of the other moving springs.

17. A relay, characterized in that, include: A pair of stationary contact leads; Multiple movable springs, each movable spring having two ends along a first direction for contacting or separating from a pair of stationary contact leads; the first direction being the arrangement direction of the pair of stationary contact leads; wherein the contact gaps between each movable spring and the stationary contact leads are all equal; as well as A short-circuit protection structure is provided for generating a suction force in the contact closing direction on at least one of the moving reeds; wherein the suction force on at least one of the moving reeds is less than the suction force on the remaining moving reeds.

18. The relay according to claim 17, characterized in that, The short-circuit protection structure includes: A first magnetic conductor is disposed on one side of the plurality of moving reeds facing the exit end of the stationary contact; along the contact closing direction, the first magnetic conductor at least partially overlaps with each of the moving reeds; and At least one second magnetic conductor is provided. Among the plurality of moving springs, except for the moving spring with the smaller attraction force, the remaining moving springs are all fixedly connected to a second magnetic conductor on the side facing away from the stationary contact lead-out end. The first magnetic conductor is used to form a magnetic circuit with at least one second magnetic conductor.

19. The relay according to claim 17, characterized in that, The short-circuit protection structure includes: At least one first magnetic conductor is disposed on one side of the plurality of moving reeds facing the stationary contact lead-out end; along the contact closing direction, the number and position of at least one first magnetic conductor correspond to the number and position of the remaining moving reeds, respectively; and At least one second magnetic conductor is provided. Except for the moving spring with the smaller attraction force, the remaining moving springs are all fixedly connected to a second magnetic conductor on the side facing away from the stationary contact lead-out end. The corresponding first magnetic conductor and second magnetic conductor are used to form a magnetic circuit.

20. The relay according to claim 17, characterized in that, The suction force on one of the moving reeds is zero.

21. The relay according to claim 20, characterized in that, The short-circuit protection structure includes: At least one first magnetic conductor is provided, and among the plurality of moving springs, except for the moving spring with the smaller attraction force, the remaining moving springs are each provided with a first magnetic conductor on the side facing the stationary contact lead-out end.

22. The relay according to claim 17, characterized in that, Multiple moving springs are arranged side by side along a third direction; The direction of motion of the movable spring is defined as the second direction, and the first direction, the second direction, and the third direction are perpendicular to each other.

23. The relay according to claim 17, characterized in that, The short-circuit protection structure includes: At least one first magnetic conductor is located on the side of the plurality of moving reeds facing the stationary contact lead-out end; and Multiple second magnetic conductors are respectively fixedly connected to the side of the multiple moving springs facing away from the stationary contact lead-out end, and the first magnetic conductor is used to form a magnetic circuit with the second magnetic conductors; In this embodiment, the thickness of at least one of the second magnetic conductors is less than the thickness of the remaining second magnetic conductors.

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