Anti-short-circuit high-voltage direct-current relay

Abstract

The utility model discloses an anti-short-circuit high-voltage direct-current relay, which comprises a moving contact piece and two static contacts, the bottoms of the two static contacts are provided with static contacts, the moving contact piece is positioned below the two static contacts, the moving contact piece is provided with two moving contacts corresponding to the two static contacts one by one, and the moving contact piece is used for getting close to or away from the two static contacts; the anti-short circuit assembly comprises an upper magnetizer and a lower magnetizer which are correspondingly arranged up and down, the upper magnetizer is fixedly arranged, the lower magnetizer can be close to or away from the upper magnetizer, and the movable contact is arranged between the upper magnetizer and the lower magnetizer; the fixing assembly comprises a ceramic cover and a supporting frame, the two static contacts are fixed to the top end of the ceramic cover at intervals and extend into a cavity of the ceramic cover, the movable contact piece, the upper magnetizer, the lower magnetizer and the supporting frame are all arranged in the cavity of the ceramic cover, and the supporting frame is arranged at the bottom of the upper magnetizer and supports the upper magnetizer to the inner wall of the top of the ceramic cover. The relay utilizes a simple structure to realize stable contact between the movable contact and the static contact under large short-circuit current.

Description

Technical Field

[0001] The utility model relates to the technical field of relays, in particular to a short-circuit-resistant high-voltage direct current relay. Background Art

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

[0003] High-voltage DC relay is a type of relay. When the load is short-circuited, the short-circuit current will generate electrostatic repulsion between the moving contact and the static contact of the high-voltage DC relay, affecting the contact stability between the moving contact and the static contact, causing the moving contact to bounce open, resulting in contact arcing. Therefore, the high-voltage DC relay uses the electromagnetic attraction of the upper magnetic conductor to the lower magnetic conductor to overcome the electrostatic repulsion to ensure stable contact between the moving contact and the static contact.

[0004] With the rapid development of new energy and the continuous expansion of relay application fields, the short-circuit current of the load has increased significantly, which will cause the lower magnetic conductor to also generate electromagnetic attraction on the upper magnetic conductor, resulting in the electromagnetic attraction of the upper magnetic conductor to the lower magnetic conductor being unable to overcome the electromotive repulsion and the electromagnetic attraction of the lower magnetic conductor to the upper magnetic conductor, thereby being unable to avoid the bounce of the moving contact. For this reason, the existing high-voltage DC relay fixes the upper magnetic conductor, and the upper magnetic conductor will not be affected by the electromagnetic attraction of the lower magnetic conductor, thereby ensuring the stable contact between the moving contact and the static contact under large short-circuit current. However, the existing fixing structure of the upper magnetic conductor is complex, requiring multiple components such as positioning blocks, positioning grooves, insulating parts, and connectors to cooperate and fix, and requires complex processes such as plugging, drilling holes, slotting, threading, and riveting to achieve the purpose of fixing the upper magnetic conductor, which prolongs the production cycle and production cost of the high-voltage DC relay. Utility Model Content

[0005] In order to overcome at least one defect of the prior art described above, the utility model provides a short-circuit resistant high-voltage DC relay, which utilizes a simple structure to achieve stable contact between a moving contact and a static contact under a large short-circuit current.

[0006] The technical solution adopted by the utility model to solve the problem is:

[0007] A short-circuit-resistant high-voltage DC relay, comprising:

[0008] The contact assembly includes a moving contact piece and two stationary contacts. The two stationary contacts are provided with stationary contacts at the bottom. The moving contact piece is located below the two stationary contacts. The moving contact piece is provided with two moving contacts corresponding to the two stationary contacts one by one. The moving contact piece is used to approach or move away from the two stationary contacts so that the two moving contacts are in contact with or separated from the corresponding two stationary contacts.

[0009] The anti-short circuit component comprises an upper magnetic conductor and a lower magnetic conductor which are arranged correspondingly from top to bottom, the upper magnetic conductor is fixedly arranged, the lower magnetic conductor can be close to or away from the upper magnetic conductor, and the moving contact piece is arranged between the upper magnetic conductor and the lower magnetic conductor to form a magnetic circuit between the upper magnetic conductor and the lower magnetic conductor;

[0010] A fixed component includes a ceramic cover and a support frame. Two static contacts are fixed at the top of the ceramic cover at intervals and extend into the cavity of the ceramic cover. A moving contact piece, an upper magnetic conductor, a lower magnetic conductor and a support frame are all arranged in the cavity of the ceramic cover. The support frame is arranged at the bottom of the upper magnetic conductor and supports the upper magnetic conductor to the top inner wall of the ceramic cover so that the upper magnetic conductor is fixed between the top inner wall of the ceramic cover and the support frame.

[0011] Furthermore, an insulating pad is provided between the upper magnetic conductor and the top inner wall of the ceramic cover.

[0012] Furthermore, the insulating pad is an elastic pad.

[0013] Furthermore, the upper magnetic conductors are provided with one, two or more pieces, and the two or more upper magnetic conductors are vertically stacked.

[0014] Furthermore, the two moving contacts are arranged near the two ends of the moving contact piece in the length direction, the upper magnetic conductor is a straight-line structure and extends along the width direction of the moving contact piece, and the upper magnetic conductor is located between the two stationary contacts;

[0015] The lower magnetic conductor includes a transverse plate and two side plates. The two side plates are respectively arranged at the two ends of the transverse plate and extend toward the moving contact piece to form a U-shaped structure. The two side plates are located on both sides of the width direction of the moving contact piece and can be close to or away from the bottom of the upper magnetic conductor.

[0016] Furthermore, grooves are provided on both sides of the upper magnetic conductor corresponding to the two static contacts, and the grooves are concavely arranged away from the corresponding static contacts.

[0017] Furthermore, the support frame includes a support plate and two vertical plates, the two vertical plates are respectively arranged at the two end portions of the support plate and extend toward the bottom of the upper magnetic conductor, the tops of the two vertical plates respectively correspond to the two end portions in the length direction of the bottom of the upper magnetic conductor, and the lower magnetic conductor and the moving contact piece are arranged in the space enclosed by the support frame and the upper magnetic conductor.

[0018] Furthermore, the relay also includes a pushing assembly capable of pushing the moving contact piece close to the static contact, the pushing assembly including a vertically arranged push rod, a rod sleeve and an over-travel elastic member, the lower part of the push rod is fixed in the rod sleeve, the upper part of the push rod extends upward and slides through the lower magnetic conductor and the moving contact piece in sequence, and the over-travel elastic member vertically abuts between the lower magnetic conductor and the rod sleeve.

[0019] Furthermore, a limiting groove adapted to the top of the over-travel elastic member is provided at the bottom of the lower magnetic conductor, and the top of the over-travel elastic member is arranged in the limiting groove;

[0020] And / or, a limiting ring adapted to the bottom end of the over-travel elastic member is fixed to the top of the rod sleeve, and the bottom end of the over-travel elastic member is arranged in the limiting ring.

[0021] Furthermore, a first through hole is vertically opened in the support plate of the support frame, and the rod sleeve slides through the first through hole. The top of the rod sleeve is provided with a convex portion protruding radially outward, and the projection of the first through hole on the horizontal plane is located within the projection of the convex portion on the horizontal plane, so that the bottom end of the convex portion can abut the top end of the support plate.

[0022] Furthermore, the upper magnetic conductor is provided with a second through hole which penetrates vertically, and the position of the second through hole corresponds to the position of the push rod, and the top of the push rod can slide through the second through hole.

[0023] Furthermore, a slot is provided on the radial outer periphery of the top of the push rod, and a clamp is provided in the slot. The clamp extends radially outward until the projection of the clamp on the horizontal plane partially overlaps with the projection of the moving contact piece on the horizontal plane, so that the bottom end of the clamp can abut the top end of the moving contact piece.

[0024] Furthermore, a plurality of vertical convex ribs are arranged at intervals on the inner wall of the ceramic cover, and at least one pair of convex ribs is arranged on both sides of the upper magnetic conductor and the lower magnetic conductor in the width direction.

[0025] Beneficial effects:

[0026] The short-circuit-resistant high-voltage DC relay of the utility model fixes the upper magnetic conductor through a fixing assembly to achieve stable contact between the moving contact and the static contact under a large short-circuit current, that is, by setting a support frame at the bottom of the upper magnetic conductor and supporting the upper magnetic conductor to the top inner wall of the ceramic cover, so that the upper magnetic conductor is fixed between the top inner wall of the ceramic cover and the support frame. Therefore, the fixing of the upper magnetic conductor only requires two structures, the ceramic cover and the support frame, and the structure is simple, and there is no need to perform processes such as plugging, drilling, grooving, threading, riveting, etc., and the assembly is simple and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a cross-sectional view of the short-circuit-resistant high-voltage DC relay of the utility model;

[0028] Figure 2It is a cross-sectional view of the fixing assembly, the contact assembly, the anti-short circuit assembly, the pushing assembly and part of the electromagnetic assembly of the utility model;

[0029] Figure 3 It is a structural schematic diagram of a short-circuit-resistant high-voltage DC relay of the utility model;

[0030] Figure 4 It is a cross-sectional view of the upper cover, ceramic cover, insulating pad and anti-short circuit component of the utility model;

[0031] Figure 5 for Figure 4 The enlarged view of point A in the middle;

[0032] Figure 6 It is an exploded view of the partial structures of the fixing assembly, the contact assembly, the anti-short circuit assembly, the pushing assembly and the electromagnetic assembly of the utility model;

[0033] Figure 7 for Figure 2 Enlarged view of point B in the middle;

[0034] Figure 8 This is an exploded view of the installation structure of the push assembly of the utility model;

[0035] Fig. 9 for Figure 1 Enlarged view of point C in the middle.

[0036] The meanings of the reference numerals are as follows:

[0037] 1. Fixing assembly; 11. Ceramic cover; 111. Protruding rib; 112. Fixing groove; 12. Support frame; 121. Support plate; 1211. First through hole; 122. Vertical plate; 13. Insulating pad; 2. Contact assembly; 21. Moving contact piece; 211. Moving contact; 212. Fourth through hole; 22. Static contact; 221. Static contact; 3. Anti-short circuit assembly; 31. Upper magnetic conductor; 311. Groove; 312. Second through hole hole; 32, lower magnetic conductor; 321, horizontal plate; 3211, limiting groove; 3212, third through hole; 322, side plate; 4, pushing assembly; 41, push rod; 411, clamping groove; 42, rod sleeve; 421, convex part; 43, over-travel elastic part; 44, limiting ring; 45, clamping part; 5, shell; 51, upper cover; 511, fixing plate; 52, bottom plate; 521, convex part; 6, electromagnetic assembly; 61, recessed part. DETAILED DESCRIPTION

[0038] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0041] The utility model provides a short-circuit resistant high-voltage DC relay. Figure 1 , including a contact assembly 2, the contact assembly 2 includes a moving contact piece 21 and two stationary contacts 22, the bottoms of the two stationary contacts 22 are each provided with a stationary contact 221, the moving contact piece 21 is located below the two stationary contacts 22, and the moving contact piece 21 is provided with two moving contacts 211 corresponding to the two stationary contacts 221 one by one, and the moving contact piece 21 is used to approach or move away from the two stationary contacts 22, so that the two moving contacts 211 are in contact with or separated from the corresponding two stationary contacts 221. When the moving contact piece 21 contacts the bottoms of the two stationary contacts 22, the two moving contacts 211 are in contact with the corresponding two stationary contacts 221 one by one, so that the current flows into one stationary contact 22, flows out from the other stationary contact 22 after passing through the moving contact piece 21, and thus the load is connected.

[0042] When the load short-circuit current is very large, an electric repulsion force will be generated between the moving contact piece 21 and the static contact 22, so that the moving contact piece 21 is subjected to a downward electric repulsion force, and the static contact 22 is subjected to an upward electric repulsion force, which affects the contact stability between the moving contact 211 and the static contact 221. Since the static contact 22 is fixedly arranged in the relay, the electric repulsion force will cause the moving contact piece 21 and the moving contact 211 to bounce downward, thereby causing contact arcing, violent combustion, and even explosion. To this end, the relay of the utility model also includes an anti-short circuit component 3, and the anti-short circuit component 3 includes an upper magnet 31 and a lower magnet 32 ​​correspondingly arranged above and below, the upper magnet 31 is fixedly arranged, and the lower magnet 32 ​​can be close to or away from the upper magnet 31, and the moving contact piece 21 is arranged between the upper magnet 31 and the lower magnet 32, so that a magnetic circuit can be formed between the upper magnet 31 and the lower magnet 32. When a large current short circuit occurs, a magnetic circuit is formed between the upper magnetic conductor 31 and the lower magnetic conductor 32, so that the upper magnetic conductor 31 generates an upward electromagnetic attraction on the lower magnetic conductor 32 to overcome the downward electric repulsion, thereby blocking the movable contact piece 21 from popping open through the lower magnetic conductor 32 to ensure stable contact between the movable contact 211 and the static contact 221.

[0043] The upper magnet 31 and the lower magnet 32 ​​can be made of magnetic materials such as iron, cobalt, nickel and their alloys to ensure the smooth formation of the magnetic circuit when current passes through the moving contact piece 21. It should be noted that after the magnetic circuit is formed, not only the upper magnet 31 has an upward electromagnetic attraction on the lower magnet 32, but the lower magnet 32 ​​also has a downward electromagnetic attraction on the upper magnet 31. The resistance of the electromagnetic attraction in the opposite direction cannot ensure that the anti-short circuit component 3 can overcome the downward electric repulsion of the moving contact piece 21. Therefore, refer to Figure 2 Combined with Figure 1 The relay of the utility model further comprises a fixing assembly 1, which comprises a ceramic cover 11 and a support frame 12, wherein two static contacts 22 are fixed at intervals at the top of the ceramic cover 11 and extend into the cavity of the ceramic cover 11. The top of the ceramic cover 11 is provided with two assembly openings adapted to the two static contacts 22, the two assembly openings are arranged at intervals and communicated with the cavity of the ceramic cover 11, so that the two static contacts 22 are correspondingly assembled on the two assembly openings, and the lower ends of the two static contacts 22 extend downward into the cavity of the ceramic cover 11, and the upper ends of the two static contacts 22 are away from the ceramic cover 11 and extend upward to be exposed above the ceramic cover 11. The moving contact piece 21, the upper magnetic conductor 31, the lower magnetic conductor 32 and the support frame 12 are all arranged in the cavity of the ceramic cover 11. The support frame 12 is arranged at the bottom of the upper magnetic conductor 31 and supports the upper magnetic conductor 31 to the top inner wall of the ceramic cover 11 so that the upper magnetic conductor 31 is fixed between the top inner wall of the ceramic cover 11 and the support frame 12.

[0044] Therefore, the short-circuit-resistant high-voltage DC relay of the utility model fixes the upper magnet 31 through the fixing assembly 1 to overcome the downward electromagnetic attraction of the lower magnet 32 ​​on the upper magnet 31, thereby ensuring that the upward electromagnetic attraction of the upper magnet 31 on the lower magnet 32 ​​is not affected to overcome the downward electric repulsion of the moving contact 21, and achieve stable contact between the moving contact 211 and the static contact 221 under a large short-circuit current, avoiding the occurrence of contact arcing and the like. Specifically, the utility model sets the support frame 12 at the bottom of the upper magnet 31, and supports the upper magnet 31 to the top inner wall of the ceramic cover 11, so that the upper magnet 31 is fixed between the top inner wall of the ceramic cover 11 and the support frame 12. In this way, the fixing of the upper magnet 31 only requires two structures, the ceramic cover 11 and the support frame 12, and the structure is simple, and no plug-in, hole-making, slotting, threaded connection, riveting and other processes are required, and the assembly is simple and the cost is low.

[0045] Moreover, the upper magnet 31 of the utility model is provided with one, two or more pieces, and two or more pieces of the upper magnet 31 are vertically stacked. When the short-circuit current is small, the downward electric repulsion force on the moving contact piece 21 is small, and the electromagnetic attraction required to overcome the electric repulsion force is also small, and only one piece of the upper magnet 31 can be provided. When the short-circuit current is large, the downward electric repulsion force on the moving contact piece 21 is large, and a large electromagnetic attraction force is required to overcome the electric repulsion force. The purpose of increasing the electromagnetic attraction force can be achieved by vertically stacking two or more pieces of the upper magnet 31. The specific number of the upper magnets 31 is set according to the electromagnetic attraction force of a single upper magnet 31 and the size of the electric repulsion force. Therefore, the increase in the thickness of the upper magnet 31 can increase the electromagnetic attraction force of the upper magnet 31 on the lower magnet 32, and further ensure that the upward electromagnetic attraction force of the upper magnet 31 on the lower magnet 32 ​​can overcome the downward electric repulsion force on the moving contact piece 21.

[0046] In addition, when there are two or more upper magnets 31, if the two or more upper magnets 31 have different sizes, the electromagnetic attraction force on the lower magnet 32 ​​will be scattered. Therefore, preferably, the projections of the two or more upper magnets 31 on the horizontal plane completely overlap, which is conducive to concentrating the electromagnetic attraction force of the upper magnet 31 on the lower magnet 32 ​​to overcome the downward electromotive repulsion of the movable contact piece 21.

[0047] It should be noted that the above-mentioned fixed component 1, contact component 2 and anti-short circuit component 3 of the relay can be directly installed in the application product, such as directly installed in the battery pack, electrical control box, etc. of the new energy vehicle. Figure 1 and Figure 3The relay is provided with a housing 5 for accommodating and protecting, and the above-mentioned fixed assembly 1, contact assembly 2 and anti-short circuit assembly 3 are installed in the housing 5. The housing 5 includes an upper cover 51 and a bottom plate 52, and the upper cover 51 is covered on the bottom plate 52 to form an accommodating cavity of the housing 5, and the fixed assembly 1, contact assembly 2 and anti-short circuit assembly 3 are all arranged in the accommodating cavity of the housing 5, and the upper ends of the two static contacts 22 extend upward to the top end of the upper cover 51.

[0048] See also Figure 4 and Figure 5 A fixing plate 511 is extended from the top inner wall of the upper cover 51 toward the top of the ceramic cover 11. A fixing groove 112 adapted to the fixing plate 511 is opened at the top of the ceramic cover 11. The position of the fixing groove 112 corresponds to the position of the fixing plate 511. The fixing plate 511 is arranged in the fixing groove 112 so that the ceramic cover 11 can be stably installed in the accommodating cavity of the shell 5, thereby ensuring the stable installation of the internal components of the ceramic cover 11.

[0049] See also Figure 6 , the two moving contacts 211 are arranged near the two ends of the moving contact piece 21 in the length direction, that is, the two stationary contacts 22 are arranged at intervals along the length direction of the moving contact piece 21. The upper magnetic conductor 31 is a straight-line structure and extends along the width direction of the moving contact piece 21. The upper magnetic conductor 31 is located between the two stationary contacts 22. Grooves 311 are provided on both sides of the upper magnetic conductor 31 corresponding to the two stationary contacts 22, and the grooves 311 are arranged concavely away from the corresponding stationary contacts 22. The setting of the grooves 311 increases the distance between the stationary contacts 22 and the upper magnetic conductor 31, thereby increasing the electrical gap between the upper magnetic conductor 31 and the stationary contacts 22.

[0050] The lower magnetizer 32 includes a horizontal plate 321 and two side plates 322. The two side plates 322 are respectively arranged at the two ends of the horizontal plate 321 and extend toward the movable contact piece 21 to form a U-shaped structure. The two side plates 322 are located on both sides of the width direction of the movable contact piece 21 and can be close to or away from the bottom of the upper magnetizer 31. Since the lower magnetizer 32 is a U-shaped structure, the movable contact piece 31 is arranged in the U-shaped groove of the lower magnetizer 32, which can limit the movable contact piece 31.

[0051] It is worth noting that the two side plates 322 of the lower magnet 32 ​​face the moving contact piece 21 and can exceed the top of the moving contact piece 21. When the moving contact piece 21 moves toward the stationary contact 22, the lower magnet 32 ​​moves upward synchronously with the moving contact piece 21, and the two side plates 322 of the lower magnet 32 ​​can abut and collide with the upper magnet 31. For this purpose, see Figure 2 and Figure 4, an insulating pad 13 is provided between the upper magnetic conductor 31 and the top inner wall of the ceramic cover 11. That is, the support frame 12 supports the upper magnetic conductor 31 to closely abut against the bottom of the insulating pad 13, and indirectly supports the insulating pad 13 to closely abut against the top inner wall of the ceramic cover 11, so that the upper magnetic conductor 31 is fixed between the top inner wall of the ceramic cover 11 and the support frame 12 through the insulating pad 13. As a result, the upper magnetic conductor 31 does not directly contact the ceramic cover 11, and the provision of the insulating pad 13 increases the creepage distance between the two static contacts 2.

[0052] The insulating pad 13 of the present invention is an elastic pad, such as a rubber pad. When the two side plates 322 of the lower magnetizer 32 abut against and collide with the upper magnetizer 31, the elastic insulating pad 13 can play a buffering role.

[0053] See also Figure 4 The inner wall of the ceramic cover 11 is provided with a plurality of vertical ribs 111 at intervals, and the provision of the ribs 111 can improve the strength of the ceramic cover 11. On this basis, at least one pair of ribs 111 is provided on both sides of the width direction of the upper magnet 31 and the lower magnet 32. In this way, a guide groove can be formed between the at least one pair of ribs 111, which can not only limit the upper magnet 31 and the lower magnet 32, but also guide the movement of the lower magnet 31.

[0054] Based on the above structure, see Figure 2 and Figure 6 The support frame 12 includes a support plate 121 and two vertical plates 122. The two vertical plates 122 are respectively arranged at the two ends of the support plate 121 and extend toward the bottom of the upper magnetic conductor 31. The tops of the two vertical plates 122 respectively abut against the two ends of the length direction of the bottom of the upper magnetic conductor 31. The lower magnetic conductor 32 and the moving contact piece 21 are arranged in the space enclosed by the support frame 12 and the upper magnetic conductor 31.

[0055] Since the upper magnet 31 and the lower magnet 32 ​​are arranged correspondingly along the length direction, and the two vertical plates 122 of the support frame 12 are arranged at intervals along the length direction of the upper magnet 31, the two vertical plates 122 of the support frame 12 are arranged on the outer side of the corresponding side plate 322 of the lower magnet 32, so that the support frame 12 can limit the lower magnet 32 ​​to a certain extent.

[0056] In addition, see Figure 1 , Figure 2 and Figure 6The relay further includes a push assembly 4 capable of pushing the moving contact piece 21 close to the stationary contact 22. The push assembly 4 includes a vertically arranged push rod 41, a rod sleeve 42 and an overtravel elastic member 43. The lower portion of the push rod 41 is fixed in the rod sleeve 42, the upper portion of the push rod 41 extends upward and slides through the lower magnet 32 ​​and the moving contact piece 21 in sequence, and the overtravel elastic member 43 vertically abuts between the lower magnet 32 ​​and the rod sleeve 42. The push rod 41 and the rod sleeve 42 move upward synchronously to squeeze the overtravel elastic member 43 and drive the lower magnet 32 ​​and the moving contact piece 21 to move upward until the moving contact 211 contacts the stationary contact 221. On this basis, the push rod 41 and the rod sleeve 42 continue to squeeze the overtravel elastic member 43, and the overtravel elastic member 43 further provides an upward support force for the lower magnet 32 ​​and the moving contact piece 21, so that there is an extrusion pressure between the moving contact 211 and the static contact 221, ensuring the contact stability of the moving contact 211 and the static contact 221. During the overtravel extrusion process, the lower magnet 32 ​​and the moving contact piece 21 do not move upward with the push rod 41 and the rod sleeve 42.

[0057] The over-travel elastic member 43 may be a component with compressible resilience such as a spring or a spring sheet.

[0058] In order to ensure the stable installation of the over-travel elastic member 43, a limiting groove 3211 adapted to the top of the over-travel elastic member 43 is provided at the bottom of the lower magnetic conductor 32, and the top of the over-travel elastic member 43 is arranged in the limiting groove 3211. Specifically, the limiting groove 3211 is provided at the bottom of the horizontal plate 321 of the lower magnetic conductor 32. And / or, a limiting ring 44 adapted to the bottom end of the over-travel elastic member 43 is fixed to the top of the rod sleeve 42, and the bottom end of the over-travel elastic member 43 is arranged in the limiting ring 44. Therefore, the setting of the limiting groove 3211 and the limiting ring 44 can limit the over-travel elastic member 43 to ensure that the over-travel elastic member 43 is compressed in the vertical direction.

[0059] See also Figure 8 The support plate 121 of the support frame 12 is vertically provided with a first through hole 1211, the rod sleeve 42 slides through the first through hole 1211, and the top of the rod sleeve 42 is provided with a convex portion 421 that protrudes radially outward, and the projection of the first through hole 1211 on the horizontal plane is located within the projection of the convex portion 421 on the horizontal plane, so that the bottom end of the convex portion 421 can abut against the top end of the support plate 121. The limiting ring 44 is fixed on the convex portion 421, and the bottom end of the overtravel elastic member 43 is located in the limiting ring 44 and abuts against the convex portion 421.

[0060] The horizontal plate 321 of the lower magnetic conductor 32 may be provided with a third through hole 3212 that penetrates vertically, and the position of the third through hole 3212 corresponds to the position of the push rod 41. The movable contact piece 21 is provided with a fourth through hole 212 that penetrates vertically, and the position of the fourth through hole 212 corresponds to the position of the push rod 41. The upper part of the push rod 41 slides through the third through hole 3212 and the fourth through hole 212 in sequence, so that the top of the push rod 41 exceeds the top of the movable contact piece 21.

[0061] On this basis, a slot 411 is provided at the radial outer periphery of the top of the push rod 41, and a clamp 45 is provided in the slot 411. The clamp 45 extends radially outward until the projection of the clamp 45 on the horizontal plane partially overlaps with the projection of the movable contact piece 21 on the horizontal plane, so that the bottom end of the clamp 45 can abut against the top end of the movable contact piece 21. Thus, the clamp 45 can limit the movable contact piece 21 and the lower magnet 32 ​​to prevent the movable contact piece 21 and the lower magnet 32 ​​from detaching from the top of the push rod 41.

[0062] The upper magnetic conductor 31 is provided with a second through hole 312 which runs vertically therethrough. The position of the second through hole 312 corresponds to the position of the push rod 41. The top of the push rod 41 can slide through the second through hole 312. The second through hole 312 provides a larger movable space for the push rod 41 to move upward, so as to prevent the push rod 41 from being blocked by the upper magnetic conductor 31 during the upward movement.

[0063] The movement of the push assembly 4 of the utility model is realized by the electromagnetic assembly 6, which is a common assembly in relays. Its specific structure can refer to the prior art such as CN113675043A and CN216120116U, which will not be described in detail here. The electromagnetic assembly 6 is arranged below the ceramic cover 11, and the support plate 121 of the support frame 12 is fixed on the top of the electromagnetic assembly 6. The push rod 41 and the lower part of the rod sleeve 42 of the push assembly 4 pass through the support plate 121 of the support frame 12 and extend downward into the electromagnetic assembly 6.

[0064] In the initial state, when the push assembly 4 does not move upward, the bottom end of the protrusion 421 of the rod sleeve 42 abuts against the top of the support plate 121, and the lower magnet 32 ​​and the moving contact piece 21 move downward relative to the push rod 41 due to their own gravity and squeeze the overtravel elastic member 43. After the electromagnetic assembly 6 is magnetized, it pushes the rod sleeve 42 and the push rod 41 to move upward synchronously to squeeze the overtravel elastic member 43 and drive the lower magnet 32 ​​and the moving contact piece 21 to move upward until the moving contact 211 contacts the static contact 221. At this time, the current flows into one static contact 22, passes through the moving contact piece 21, and flows out from the other static contact 22, thereby realizing the connection of the load and forming a magnetic circuit between the upper magnet 31 and the lower magnet 32. On this basis, the electromagnetic assembly 6 pushes the push rod 41 and the rod sleeve 42 to continue to squeeze the overtravel elastic member 43, and the overtravel elastic member 43 further provides an upward support force for the lower magnet 32 ​​and the moving contact piece 21, so that there is an extrusion pressure between the moving contact 211 and the static contact 221, ensuring the stability of the contact between the moving contact 211 and the static contact 221. During the overtravel extrusion process, the lower magnet 32 ​​and the moving contact piece 21 do not move upward with the push rod 41 and the rod sleeve 42. When a large current short circuit occurs, a magnetic conductive loop is formed between the upper magnet 31 and the lower magnet 32, and the upper magnet 31 is fixed by the fixing assembly 1, so that the upper magnet 31 generates an upward electromagnetic attraction to the lower magnet 32 ​​to overcome the downward electromotive repulsion, thereby blocking the moving contact piece 21 from bouncing open through the lower magnet 32 ​​to ensure stable contact between the moving contact 211 and the static contact 221.

[0065] See also Fig. 9 A recessed portion 61 is provided at the bottom of the electromagnetic component 6, and a raised portion 521 adapted to the recessed portion 61 is provided at the top of the bottom plate 52. The position of the raised portion 521 corresponds to the position of the recessed portion 61, and the raised portion 521 is arranged in the recessed portion 61 to achieve stable installation of the electromagnetic component 6 on the bottom plate 52.

[0066] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A short-circuit-resistant high-voltage DC relay, characterized in that: include: A contact assembly (2), comprising a moving contact piece (21) and two stationary contacts (22), wherein the bottoms of the two stationary contacts (22) are each provided with a stationary contact (221), the moving contact piece (21) is located below the two stationary contacts (22), the moving contact piece (21) is provided with two moving contacts (211) corresponding one-to-one to the two stationary contacts (221), and the moving contact piece (21) is used to approach or move away from the two stationary contacts (22) so that the two moving contacts (211) are in contact with or separated from the corresponding two stationary contacts (221); The anti-short circuit component (3) comprises an upper magnetic conductor (31) and a lower magnetic conductor (32) which are arranged correspondingly in the upper and lower parts, wherein the upper magnetic conductor (31) is fixedly arranged, and the lower magnetic conductor (32) can be close to or away from the upper magnetic conductor (31), and the movable contact piece (21) is arranged between the upper magnetic conductor (31) and the lower magnetic conductor (32) so as to form a magnetic circuit between the upper magnetic conductor (31) and the lower magnetic conductor (32); A fixed assembly (1) comprises a ceramic cover (11) and a support frame (12); the two static contacts (22) are fixed at intervals on the top of the ceramic cover (11) and extend into the cavity of the ceramic cover (11); the moving contact piece (21), the upper magnetic conductor (31), the lower magnetic conductor (32) and the support frame (12) are all arranged in the cavity of the ceramic cover (11); the support frame (12) is arranged at the bottom of the upper magnetic conductor (31) and supports the upper magnetic conductor (31) to the top inner wall of the ceramic cover (11) so that the upper magnetic conductor (31) is fixed between the top inner wall of the ceramic cover (11) and the support frame (12).

2. The short-circuit-resistant high-voltage DC relay according to claim 1, characterized in that: An insulating pad (13) is provided between the upper magnetic conductor (31) and the top inner wall of the ceramic cover (11).

3. The short-circuit-resistant high-voltage DC relay according to claim 2, characterized in that: The insulating pad (13) is an elastic pad.

4. The short-circuit-resistant high-voltage DC relay according to claim 1, characterized in that: The upper magnetic conductor (31) is provided with one, two or more pieces, and the two or more upper magnetic conductors (31) are arranged vertically stacked.

5. The short-circuit-resistant high-voltage DC relay according to claim 1, characterized in that: The two moving contacts (211) are arranged close to the two ends of the moving contact piece (21) in the length direction, the upper magnetic conductor (31) is a straight-line structure and extends along the width direction of the moving contact piece (21), and the upper magnetic conductor (31) is located between the two stationary contacts (22); The lower magnetic conductor (32) comprises a transverse plate (321) and two side plates (322); the two side plates (322) are respectively arranged at two ends of the transverse plate (321) and extend toward the movable contact piece (21) to form a U-shaped structure; the two side plates (322) are located on both sides of the movable contact piece (21) in a width direction and can be close to or away from the bottom of the upper magnetic conductor (31).

6. The short-circuit-resistant high-voltage DC relay according to claim 5, characterized in that: Grooves (311) are provided on both sides of the upper magnetic conductor (31) corresponding to the two stationary contacts (22), and the grooves (311) are arranged in a concave manner away from the corresponding stationary contacts (22).

7. The short-circuit-resistant high-voltage DC relay according to claim 1, characterized in that: The support frame (12) comprises a support plate (121) and two vertical plates (122), wherein the two vertical plates (122) are respectively arranged at two ends of the support plate (121) and extend toward the bottom of the upper magnetic conductor (31), and the tops of the two vertical plates (122) respectively correspond to the two ends of the bottom of the upper magnetic conductor (31) in the length direction, and the lower magnetic conductor (32) and the movable contact piece (21) are arranged in a space enclosed by the support frame (12) and the upper magnetic conductor (31).

8. The short-circuit-proof high-voltage DC relay according to claim 7, characterized in that: The relay further comprises a pushing assembly (4) capable of pushing the moving contact piece (21) close to the stationary contact (22), the pushing assembly (4) comprising a vertically arranged push rod (41), a rod sleeve (42) and an over-travel elastic member (43), the lower portion of the push rod (41) being fixed in the rod sleeve (42), the upper portion of the push rod (41) extending upward and slidingly passing through the lower magnetic conductor (32) and the moving contact piece (21) in sequence, and the over-travel elastic member (43) vertically abutting between the lower magnetic conductor (32) and the rod sleeve (42).

9. The short-circuit-resistant high-voltage DC relay according to claim 8, characterized in that: A limiting groove (3211) adapted to the top of the over-travel elastic member (43) is provided at the bottom of the lower magnetic conductor (32), and the top of the over-travel elastic member (43) is arranged in the limiting groove (3211); And / or, a limiting ring (44) adapted to the bottom end of the over-travel elastic member (43) is fixed to the top of the rod sleeve (42), and the bottom end of the over-travel elastic member (43) is arranged in the limiting ring (44).

10. The short-circuit-proof high-voltage DC relay according to claim 8, characterized in that: The support plate (121) of the support frame (12) is vertically provided with a first through hole (1211) penetrating therethrough, the rod sleeve (42) slides through the first through hole (1211), the top of the rod sleeve (42) is provided with a convex portion (421) protruding outward in the radial direction, the projection of the first through hole (1211) on the horizontal plane is located within the projection of the convex portion (421) on the horizontal plane, so that the bottom end of the convex portion (421) can abut against the top end of the support plate (121).

11. The short-circuit-proof high-voltage DC relay according to claim 8, characterized in that: The upper magnetic conductor (31) is provided with a second through hole (312) which penetrates vertically, and the position of the second through hole (312) corresponds to the position of the push rod (41), and the top of the push rod (41) can slide through the second through hole (312).

12. The short-circuit-resistant high-voltage DC relay according to claim 8, characterized in that: A slot (411) is provided on the radial outer periphery of the top of the push rod (41), and a clamping member (45) is provided in the slot (411). The clamping member (45) extends radially outward until the projection of the clamping member (45) on the horizontal plane partially overlaps with the projection of the movable contact piece (21) on the horizontal plane, so that the bottom end of the clamping member (45) can abut against the top end of the movable contact piece (21).

13. The short-circuit-proof high-voltage DC relay according to claim 5, characterized in that: The inner wall of the ceramic cover (11) is provided with a plurality of vertical convex ribs (111) at intervals, and at least one pair of the convex ribs (111) is provided on both sides of the upper magnetic conductor (31) and the lower magnetic conductor (32) in the width direction.

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