Large withstand current closer

Abstract

The large withstand current closer comprises a shell, a first conducting bar, a second conducting bar, an electronic ignition device and a piston, the shell comprises a first shell body and a second shell body which are spliced, and the first conducting bar and the second conducting bar are arranged between the contact surfaces of the first shell body and the second shell body in a penetrating mode and are arranged in an insulating mode. One end of the first conducting bar and one end of the second conducting bar located in the shell are arranged in a folded double-layer structure and are arranged on the displacement path of the piston in an insulated and spaced mode; mechanical sealing structures are respectively arranged between the contact surfaces of the first shell and the second shell and between the contact surfaces of the first shell, the second shell and the conducting bar, so that the shell forms a sealed shell; when the electronic ignition device acts, the piston is driven to move, and the piston drives the end, of the folded double-layer structure, of the first conducting bar to make conductive contact with the end, of the folded double-layer structure, of the second conducting bar. The utility model has the advantages of simple structure, few parts, high assembly efficiency and high mechanical sealing performance of the product.

Description

Technical Field

[0001] This utility model relates to the fields of power control and electric vehicles, and in particular to the energy release protection of energy storage components after the main circuit of an electrical fault is cut off, specifically to a high-current withstand closure for energy release protection. Background Technology

[0002] The main circuit of an electric vehicle battery pack contains numerous electrical loads, such as the distribution box, controller, and motor. Branch circuits from the distribution box further contain a large number of electrical loads, including heaters, compressors, and audio-visual instrument systems. When a fault occurs in the circuit, circuit protection devices are needed to protect these loads. In addition to traditional thermal fuses, main circuit protection devices also include excitation devices that use pyrotechnic devices to quickly cut off openings and employ fusible arc extinguishing. Generally, one or a combination of these devices is used to protect the battery pack's circuit. When a small fault current occurs in the circuit, the vehicle control system controls the excitation circuit breaker to activate, short-circuiting the positive and negative cables connected to the excitation circuit breaker. The fault current flows through the short-circuit loop, protecting the electrical loads. Simultaneously, due to the short circuit, the current in the circuit increases sharply, and the system circuit detects the abnormal short-circuit current. The fuse quickly blows or the excitation device quickly activates, thus disconnecting the circuit. For large fault currents, the excitation circuit breaker can be activated as needed, or the protection device can be activated directly. After the circuit breaker is activated, it can quickly transfer the fault current, thus protecting the electrical loads in the downstream circuit, and also shortening the operating time of the protection device.

[0003] For existing excitation closures, see Figure 1 The system mainly comprises a first housing 10 and a second housing 11 connected to each other. An electronic ignition device 12 is located at the top of the cavity of the first housing 10 and is fixed in the first housing 10 by means of the electronic ignition device 12 located at the top of the first housing 10. A connector 13 is provided outside the electronic ignition device 12. A first conductive bar 14 and a second conductive bar 15 are provided between the first housing 10 and the second housing 11 with an insulating gap. The first conductive bar 14 and the second conductive bar 15 located inside the housing are separated by an insulating gap at one end, and one end of the first conductive bar 14 is located on the displacement path of the piston 16. The electronic ignition device 12 acts according to the received trigger signal, releasing high-pressure gas as a driving force to drive the piston 16 to move. The piston 16 drives one end of the first conductive bar 14 to move toward one end of the second conductive bar 15 and make conductive contact with the second conductive bar 15, so that the excitation closure changes from an open state to a closed state.

[0004] Existing excitation closure mechanisms have the following problems:

[0005] 1. The current withstand capability of the closure is small and the withstand time is short, which may lead to the failure of the protection function;

[0006] 2. The closing mechanism generates a lot of noise during operation;

[0007] 3. The high-temperature arc gas ejected during the closing process may cause short circuits or malfunctions in other circuits, potentially resulting in equipment burnout or personal injury;

[0008] 4. The existing solution has a complex connector assembly process. Summary of the Invention

[0009] The purpose of this invention is to provide an excitation closure that can withstand high current. It integrates the functions of positioning and protecting the electronic ignition device into the first housing. At the same time, it uses its own structure to create a seal between the first and second housings, which improves the housing sealing performance of the excitation closure. It also reduces assembly steps and lowers production costs.

[0010] To achieve the above objectives, the technical solution of this utility model is a high-current withstand closing device, comprising a housing, a first conductive bar, a second conductive bar, an electronic ignition device, and a piston. The housing comprises a first housing and a second housing joined together. The electronic ignition device and the piston are respectively located in the first housing. The first conductive bar and the second conductive bar pass through the contact surface between the first housing and the second housing and are insulated from each other. One end of the first conductive bar and the second conductive bar located outside the housing is a terminal. One end of the first conductive bar and the second conductive bar located inside the housing are respectively configured with a folded double-layer structure, and the folded double-layer structure of the first conductive bar and the second conductive bar are insulated from each other and spaced along the displacement path of the piston. Mechanical sealing structures are respectively provided between the contact surfaces of the first housing and the second housing, and between the contact surfaces of the first housing, the second housing, and the conductive bars to form a sealed housing. When the electronic ignition device is activated, it drives the piston to move, and the piston drives the folded double-layer structure of the first conductive bar to make conductive contact with the folded double-layer structure of the second conductive bar.

[0011] Preferably, nested first sealing ribs and first sealing grooves are respectively provided on the contact surfaces of the first housing and the second housing that are in direct contact to form the mechanical seal structure; second sealing ribs are respectively provided on the contact surfaces of the first housing and the second housing that are in contact with the upper and lower surfaces of the first conductive busbar and the second conductive busbar, and the second sealing ribs are in sealing contact with the upper and lower surfaces of the first conductive busbar and the second conductive busbar to form the mechanical seal structure.

[0012] Preferably, a third sealing rib is provided at the bottom of the first sealing groove. When the first sealing rib is nested in the first sealing groove, the first sealing rib abuts against the third sealing rib and crushes it.

[0013] Preferably, at least one fourth sealing rib and a fourth sealing groove are nested together at the contact surface of the first housing and the second housing on the outer periphery of the first sealing rib and the first sealing groove, forming the mechanical seal structure.

[0014] Preferably, the second sealing rib on the second housing is a U-shaped groove structure, with the open end of the U-shaped groove structure facing the first conductive busbar and the second conductive busbar; when the first housing, the first conductive busbar, the second conductive busbar and the second housing are assembled, the groove material of the U-shaped groove structure is crushed, and part of the crushed material fills the groove of the U-shaped groove structure.

[0015] Preferably, positioning notches are provided on opposite sides of the first conductive busbar and the second conductive busbar located between the first housing and the second housing, and a first limiting rib is provided corresponding to the positioning notch. The first limiting rib is located in the positioning notch in an interference fit manner to limit the first conductive busbar and the second conductive busbar.

[0016] Preferably, a first mounting boss is provided at the contact surface of the first housing and the second housing through which the first conductive busbar and the second conductive busbar pass. A threaded hole is provided in the first mounting boss. A first through hole is provided on the first conductive busbar and the second conductive busbar at the corresponding positions of the first mounting boss. The first mounting bosses on the first housing and the second housing pass through the first through holes of the first conductive busbar and the second conductive busbar, respectively, and are mated in the first through holes. Screws pass through the threaded holes of the first mounting boss to connect and fix the first housing, the first conductive busbar, the second conductive busbar, and the second housing respectively. The second sealing rib is located on both sides of the first mounting boss and is connected to the outer surface of the first mounting boss.

[0017] Preferably, a second mounting boss and a first mounting countersunk hole for the second mounting boss to nest are provided at the contact surface where the first housing and the second housing directly contact each other. The second mounting boss and the first mounting countersunk hole are provided with threaded holes. Screws pass through the second mounting boss and the first mounting countersunk hole to connect the first housing and the second housing. The first mounting countersunk hole and the first mounting boss are respectively connected to the first sealing rib and the first sealing groove on their opposite outer sides.

[0018] Preferably, the terminals of the first and second conductive bars and the end located inside the housing are folded double-layer structures; the end of the first conductive bar located inside the housing is suspended in the displacement path of the piston, and the side of the second conductive bar located inside the housing facing the piston is bent to form a limiting structure. When the end of the first conductive bar located inside the housing is displaced and makes conductive contact with the end of the second conductive bar, the end of the first conductive bar abuts against the limiting structure of the second conductive bar.

[0019] Preferably, one end of the piston facing the first and second conductive busbars is configured as a door-shaped hook structure, and the first conductive busbar passes through the door-shaped hook structure of the piston.

[0020] The present invention provides a high-current-resistant excitation closure. The first housing integrates the positioning and protection functions of the electronic ignition device. The electronic ignition device is directly placed in the first housing, eliminating the need for external connectors and other components of the electronic ignition device, thereby simplifying the product structure, simplifying the assembly process, and improving assembly efficiency.

[0021] The direct contact surface between the first and second housings employs an alternating combination of a double-layer male-female sealing groove structure and a single-layer male-female groove structure to form a multi-layer mechanical seal structure. This increases the curved path of the high-temperature gas to achieve gas cooling and thermal buffering, while also dispersing the synchronicity of the gas. The bottom of the notch in the first and second housings that contact the conductive busbar is sealed with sealing ribs, and the sides are provided with limiting ribs. Through the crushing of the sealing ribs during assembly and the interference fit of the limiting ribs, a full-range seal is achieved between the conductive busbar and the contact surfaces of the first and second housings, separating the internal and external spaces and creating a relatively sealed space inside the product, thereby improving the overall sealing performance between the contact surfaces of the first and second housings.

[0022] The conductive busbar adopts a double-layered, folded structure at its terminals, saving material and simplifying manufacturing. One end of the conductive busbar within the housing features a double-layered, folded structure, which allows for precise positioning during contact, ensuring reliable communication. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an existing excitation closure.

[0024] Figure 2 This is a structural schematic diagram viewed in cross-section from the location of the first housing, the second housing, and the connecting screws of the conductive busbar.

[0025] Figure 3 This is a structural schematic diagram viewed in cross-section from the location of the screws that directly connect the first and second housings.

[0026] Figure 4 This is a schematic diagram of the first shell structure.

[0027] Figure 5 This is a schematic diagram of the second shell structure.

[0028] Figure 6 This is a structural schematic diagram and a partial enlarged view A, taken from the side of the screw that directly connects the first and second housings.

[0029] Figure 7 This is a structural schematic diagram and a partial enlarged view B, taken from one side of the first housing, the second housing, and the location of the connecting screws for the conductive busbar.

[0030] Figure 8 This is a structural schematic diagram and a partial enlarged view (C) taken from the splicing surface where the first shell, the second shell, and the conductive busbar are joined.

[0031] Figure 9 This is a schematic diagram of the pre-action excitation closure structure.

[0032] Figure 10 This is a schematic diagram and a partial enlarged view of the post-action excitation closure structure, shown in Figure D.

[0033] Figure 11 This is a schematic diagram of the first conductive busbar structure.

[0034] Figure 12 This is a schematic diagram of the second conductive busbar structure.

[0035] Figure 13 This is a schematic diagram of a piston structure.

[0036] Figure label:

[0037] Screw 5, Screw 7, First housing 10, Second housing 11, Electronic ignition device 12, Connector 13, First conductive bar 14, Second conductive bar 15, Piston 16, First housing 20, First sealing rib 201, Arc-shaped rib 202, Second sealing rib 203, First mounting boss 204, Notch 205, Fourth sealing groove 206, Positioning notch 207, Second mounting boss 210, First conductive bar 30, Movable end 301, Positioning groove 302, Limiting notch 303, Second conductive bar 31 The housing includes one end 311, a limiting structure 311a, a positioning groove 312, a limiting notch 313, a second housing 40, a second sealing rib 401, a first sealing groove 402, a third sealing rib 403, a third limiting rib 404, a first mounting boss 405, a first limiting rib 406, a second limiting rib 407, a notch 408, a positioning boss 409, a fourth sealing rib 410, a first mounting countersunk hole 412, a piston 50, a piston working end face 501, a door-shaped hook structure 502, and an electronic ignition device 60. Detailed Implementation

[0038] This utility model's high-current-resistance closure device includes a housing, a first conductive bar, a second conductive bar, an electronic ignition device, and a piston. The housing comprises a first housing and a second housing joined together. The electronic ignition device and the piston are respectively located in the first housing. The first and second conductive bars pass through the contact surfaces of the first and second housings and are insulated from each other. One end of the first and second conductive bars located outside the housing is a terminal. One end of the first and second conductive bars located inside the housing is respectively arranged in a folded double-layer structure, and the folded double-layer structure of the first and second conductive bars is insulated from each other and spaced along the displacement path of the piston. Mechanical sealing structures are respectively provided between the contact surfaces of the first and second housings and between the contact surfaces of the first housing, the second housing, and the conductive bars to form a sealed housing. When the electronic ignition device is activated, it drives the piston to move, and the piston drives one end of the folded double-layer structure of the first conductive bar to make conductive contact with one end of the folded double-layer structure of the second conductive bar.

[0039] The following describes preferred embodiments in conjunction with the accompanying drawings. The directional terms used refer only to the directions shown in the drawings and do not constitute a limitation on the technical solution of this utility model.

[0040] This utility model's high-current-resistance closure includes a housing, a conductive busbar, an electronic ignition device, and a piston. (See attached image) Figures 2 to 12 The housing comprises a first housing 20 and a second housing 40 joined together. The first housing 20 integrates the functions of the parts that fix the electronic ignition device 60. The first housing 20 has a through cavity. The inner wall of the through cavity end of the first housing 20 away from the second housing 40 is set as a positioning conical surface structure. The electronic ignition device 60 is disposed in the cavity end of the first housing 20 away from the second housing 40. It can be limited and fixed by means of interference fit, adhesive bonding, or injection molding, which also seals the contact surface between the electronic ignition device and the first housing. The signal receiving end of the electronic ignition device is located outside the housing. In this example, the positioning conical surface structure inside the cavity of the first housing is interference fitted to provide positioning and protection for the first housing 20. The piston 50 is disposed in the cavity of the first housing 20. The impact end of the piston 50 is disposed corresponding to the conductive busbar 30. The piston 50 is in sealed contact with the inner wall of the cavity of the first housing 20. This can be achieved by setting a sealing element on the outer peripheral surface of the piston 50 in contact with the inner wall of the cavity of the first housing 20, or by interference fit.

[0041] A notch 205 is provided on the end face where the first housing 20 and the second housing 40 are joined, through which the conductive busbar 24 passes. A first mounting boss 204 is located at the center of the notch 205, and a threaded hole for a screw to pass through is provided on the first mounting boss 204. Linear second sealing ribs 203 are respectively provided on both sides of the notch 205 along the circumferential direction. The linear second sealing ribs 203 are located on opposite sides of the first mounting boss 204 along the circumferential direction and are connected to the outer circumferential surface of the first mounting boss 204. A fourth sealing groove 206 and a first sealing rib 201 are provided along the circumferential direction on the end face of the first housing 20 on opposite sides of the notch 205. The first sealing rib 201 is located inside the fourth sealing groove 206 and is arranged adjacent to it. An arc-shaped rib 202 of the first housing 20 is provided on the inner side of the side of the notch 205 of the first housing 20, used to press and position the arc-shaped bent portion of the first conductive busbar 30 and the second conductive busbar 31 located inside the housing. The first housing 20 has positioning notches 207 on the outer end face of the fourth sealing groove 206. The second mounting boss 210 is provided on the inner end face of the first housing 20 at the positioning notch 207. The second mounting boss 210 has threaded holes for screws 7 to pass through. The first sealing rib 201 is located on opposite sides of the second mounting boss 210 along the circumferential direction and is connected to the outer circumferential surface of the second mounting boss 210.

[0042] On the end face where the second housing 40 is joined to the first housing 20, corresponding notches 408 are provided for the first conductive busbar 30 and the second conductive busbar 31 to pass through, corresponding to the notches 205. A corresponding positioning boss 409 is provided at the positioning notch 207. U-shaped second sealing ribs 401 are provided on both sides of the notches 408 along the circumference of the second housing 40. The U-shaped second sealing ribs 401 have U-shaped grooves, with their open ends facing the first conductive busbar 30 and the second conductive busbar 31. A first mounting boss 405 is provided at the position of the first mounting boss 204 on the first housing 20, and a threaded hole for screws to pass through is provided at the first mounting boss 405. On the end faces of the second housing 40 on both sides of the notches 408 along the circumference, corresponding to the first sealing ribs 201, first sealing grooves 402 are provided. A third sealing rib 403 is provided in the first sealing grooves 402. On the end face of the second housing 40 outside the first sealing grooves 402, corresponding to the fourth sealing grooves 206, a fourth sealing rib 410 is provided. After the first and second housings are assembled, the first sealing rib 201 is nested in the first sealing groove 402 and crushes the third sealing rib 403 to form a double-layer male-female sealing groove structure. The fourth sealing rib 410 is nested in the fourth sealing groove 206 to form a single-layer male-female sealing groove structure. Through the double-layer male-female sealing groove structure and the single-layer male-female sealing groove structure, a double mechanical seal structure is formed at the contact surface where the first and second housings directly contact, thereby improving the sealing performance of the housings.

[0043] First limiting ribs 406 are respectively provided on both sides of the notch 408 on the second housing 40. The first limiting ribs 406 are located on the side of the fourth sealing rib 410 located at the notch 408. After the first housing and the second housing are assembled, the first limiting ribs 406 are interference-fitted into the side positioning grooves 302 in the width direction of the first conductive busbar 30 and the second conductive busbar 31, restricting the position of the first conductive busbar 30 and the second conductive busbar 31. A vertical second limiting rib 407 and a horizontal third limiting rib 404 are provided in the cavity of the second housing 40. The second limiting rib 407 is used to restrict the vertical features of the first conductive busbar 30 and the second conductive busbar 31, and the third limiting rib 404 is used to support the bending and overlapping terminals of the first conductive busbar 30 and the second conductive busbar 31 extending to the limiting notch provided in the side wall of the second housing. A first mounting countersunk hole 412 is provided in the second housing 40 corresponding to the second mounting boss 210. The first mounting countersunk hole 412 is a threaded hole. During assembly, the second mounting boss 210 is inserted into the first mounting countersunk hole 412, and the screw 7 passes through the first housing 20 and the second housing 40, the second mounting boss 210, and the first mounting countersunk hole 412 to connect and fix the first housing 20 and the second housing 40. The cooperation between the second mounting boss 210 and the first mounting countersunk hole 412 improves the sealing performance between the contact surfaces of the first housing and the second housing.

[0044] First conductive bus 30 and second conductive bus 31, see reference Figure 11 and Figure 12 The first conductive busbar 30 and the second conductive busbar 31 have double-layered, folded structures at both ends. Specifically, the first conductive busbar 30 and the second conductive busbar 31 are formed from a single conductive busbar sheet, and then the ends of the sheet are bent. This structure saves conductive busbar material, facilitates forming, and simultaneously improves the strength of both ends of the first conductive busbar 30 and the second conductive busbar 31. Then, according to the product structure design requirements, it is designed into the desired shape. (See also...) Figure 11 The first conductive bus 30 includes two ends of a double-layered folded structure, wherein the movable end 301 located inside the housing is hook-shaped and suspended in the displacement path of the piston 50 inside the housing. The second conductive bus 31, see... Figure 12The device includes two ends of a double-layered folded structure. One end 311, located inside the housing, can be suspended or rest against the housing and is positioned on the displacement path of the movable end 301 of the first conductive busbar 30. Furthermore, the side of the second conductive busbar 31 facing the first conductive busbar 30 has a step-shaped limiting structure 311a due to the end folding. When the first conductive busbar 30's end 301 moves towards the second conductive busbar 31, the first conductive busbar 30's end 301 can rest against the limiting structure 311a of the second conductive busbar 31 and undergo plastic deformation, improving the contact reliability of the first conductive busbar 30 and the second conductive busbar 31. Positioning grooves (302, 312) are respectively provided on both sides of the width direction of the first conductive bus 30 and the second conductive bus 31 located between the first housing 20 and the second housing 40. During assembly, the first limiting rib 406 of the second housing 40 is nested in the positioning grooves (302, 312) of the first conductive bus 30 and the second conductive bus 31 in an interference fit manner to position the first conductive bus 30 and the second conductive bus 31. The arc-shaped rib 202 of the first housing 20 presses and positions the arc-shaped bends of the first conductive bus and the second conductive bus located in the housing.

[0045] Two connecting holes are spaced apart along the length of the terminals of the first conductive busbar 30 and the second conductive busbar 31. The diameter of the outermost connecting hole is slightly larger than that of the connecting hole. The connecting hole is located between the first housing and the second housing and is used by screws for fixing the conductive busbars. The outermost connecting hole is used for connecting the excitation closure device. Limiting notches (303, 313) are provided on both sides of the width of the double-layered folded double-layered structure in which the first conductive busbar 30 and the second conductive busbar 31 extend into the housing as terminals and bend towards the bottom of the second housing 40. The third limiting rib 404 of the second housing 40 is supported at the limiting notches (303, 313) to provide limiting support for the first conductive busbar 30 and the second conductive busbar 31. The second limiting rib 407 and the third limiting rib 404 limit the vertical features of the first conductive busbar 30 and the second conductive busbar 31.

[0046] Piston 50, see Figure 13 A door-shaped hook structure 502 extends on both sides of the piston working end face 501 toward the width direction of the first conductive bus 30 to form a door. During assembly, the suspended end of the first conductive bus 30 located inside the housing passes through the door-shaped hook structure 502 of the piston 50. The width of the opening end of the door-shaped hook structure 602 is smaller than the width of the first conductive bus 30. When the excitation closure is subjected to severe vibration, the suspended end 301 of the first conductive bus 30 can only vibrate in the door-shaped hook structure 502 of the piston 50, regardless of how it vibrates. This ensures that the first conductive bus 30 and the second conductive bus 31 will not make conductive contact when the piston 50 is in its initial position, thus improving the reliability of operation.

[0047] After the first housing 20 and the second housing 40 are joined together, the conductive busbar 30 passes through the notches (205, 408) of the first housing 20 and the second housing 40. The positioning bosses (204, 405) pass through the connecting holes of the first conductive busbar 30 and the second conductive busbar 31 respectively and mate with the corresponding connecting holes. Then, the first housing 20, the conductive busbar 30 and the second housing 40 are fixedly connected together by screws 5. When the first conductive busbar 30 and the second conductive busbar 31 are assembled, the first limiting ribs 406 on the second housing on both sides of the notches (205, 408) are interlocked in the positioning grooves on both sides of the width direction of the first conductive busbar 30 and the second conductive busbar 31, so as to achieve positioning and sealing of both sides of the width direction of the first conductive busbar 30 and the second conductive busbar 31. The first conductive busbar 30 and the second conductive busbar 31 are interference-fitted into the notch between the first housing and the second housing. Under assembly pressure, the second sealing rib 203 and the second sealing rib 401 collapse toward one end of the first conductive busbar 30 and the second conductive busbar 31, thereby sealing the conductive busbar 30 toward the surface of the first housing and the second housing. The powdery material from the collapse of the second sealing rib 401 fills the U-shaped groove of the U-shaped second sealing rib 401, and a complete mechanical seal structure is formed between the outer peripheral surface of the conductive busbar and the contact surface of the first housing and the second housing.

[0048] The first sealing rib 201 of the first housing 20 is nested in the first sealing groove 402 of the second housing 40, causing the third sealing rib 403 to crush and abut against the end face of the first sealing rib 201, forming a double-layer male-female groove mechanical seal structure. Simultaneously, the fourth sealing rib 410 on the second housing 40 is nested in the fourth sealing groove 206 of the first housing 20, forming a single-layer male-female groove mechanical seal structure. The single-layer male-female groove structure is located outside the double-layer male-female groove structure, arranged in a ring-shaped staggered pattern in the circumferential direction to improve sealing performance. Through the sealing fit of the first sealing rib 201, the first sealing groove 402, and the third sealing rib 403, the sealing fit of the fourth sealing rib 410 and the fourth sealing groove 206, and the sealing fit of the sealing ribs between the outer circumferential surfaces of the first and second conductive bars 30 and the contact surfaces of the first and second housings, a complete mechanical seal structure is formed between the contact surfaces of the first housing 20 and the second housing 40, thus creating a sealed housing. The positioning boss 409 of the second housing 40 is nested in the positioning notch 207 of the first housing 20 to achieve assembly positioning between the first housing 20 and the second housing 40, preventing them from rotating relative to each other. Then, the first housing and the second housing are fixedly connected together by screws 7 passing directly through the first housing and the second housing.

[0049] This utility model achieves complete sealing of the shell through the cooperation of the sealing ribs and sealing grooves between the contact surfaces of the first shell and the second shell, as well as the cooperation of the sealing ribs and limiting ribs on the outer peripheral surfaces of the first conductive busbar 30 and the second conductive busbar 31. This improves the sealing performance of the shell, eliminates the possibility of electric arc escaping outside the shell, and enhances work safety.

Claims

1. A high-current-resistance closure device, characterized in that, The device includes a housing, a first conductive bar, a second conductive bar, an electronic ignition device, and a piston. The housing comprises a first housing and a second housing joined together. The electronic ignition device and the piston are respectively located in the first housing. The first conductive bar and the second conductive bar pass through the contact surface between the first housing and the second housing and are insulated from each other. One end of the first conductive bar and the second conductive bar located outside the housing is a terminal. One end of the first conductive bar and the second conductive bar located inside the housing are respectively arranged in a folded double-layer structure, and the folded double-layer structure of the first conductive bar and the second conductive bar are insulated from each other and spaced along the displacement path of the piston. Mechanical sealing structures are respectively provided between the contact surfaces of the first housing and the second housing, and between the contact surfaces of the first housing, the second housing, and the conductive bars to form a sealed housing. When the electronic ignition device is activated, it drives the piston to move, and the piston drives the folded double-layer structure of the first conductive bar to make conductive contact with the folded double-layer structure of the second conductive bar.

2. The high withstand current closing device according to claim 1, characterized in that, The first housing and the second housing are respectively provided with nested first sealing ribs and first sealing grooves on the contact surfaces that directly contact each other to form the mechanical seal structure; the first housing and the second housing are respectively provided with second sealing ribs on the contact surfaces that contact the upper and lower surfaces of the first conductive busbar and the second conductive busbar, and the second sealing ribs are in sealing contact with the upper and lower surfaces of the first conductive busbar and the second conductive busbar to form the mechanical seal structure.

3. The high withstand current closing device according to claim 2, characterized in that, A third sealing rib is provided at the bottom of the first sealing groove. When the first sealing rib is nested in the first sealing groove, the first sealing rib abuts against the third sealing rib and crushes it.

4. The high withstand current closing device according to claim 3, characterized in that, At least one fourth sealing rib and fourth sealing groove are nested together to form the mechanical seal structure at the contact surface of the first housing and the second housing on the outer periphery of the first sealing rib and the first sealing groove.

5. The high withstand current closing device according to claim 2, characterized in that, The second sealing rib on the second housing is a U-shaped groove structure, with the open end of the U-shaped groove structure facing the first conductive busbar and the second conductive busbar. When the first housing, the first conductive busbar, the second conductive busbar and the second housing are assembled, the groove material of the U-shaped groove structure is crushed, and part of the crushed material fills the groove of the U-shaped groove structure.

6. The high withstand current closing device according to claim 2, characterized in that, Positioning notches are provided on opposite sides of the first conductive busbar and the second conductive busbar located between the first housing and the second housing. A first limiting rib is provided corresponding to the positioning notch. The first limiting rib is located in the positioning notch in an interference fit manner to limit the first conductive busbar and the second conductive busbar.

7. The high withstand current closing device according to claim 2, characterized in that, First mounting bosses are respectively provided at the contact surfaces of the first housing and the second housing through which the first conductive busbar and the second conductive busbar pass. Threaded holes are provided in the first mounting bosses. First through holes are respectively opened on the first conductive busbar and the second conductive busbar at the positions corresponding to the first mounting bosses. The first mounting bosses on the first housing and the second housing pass through the first through holes of the first conductive busbar and the second conductive busbar, and are joined in the first through holes. Screws pass through the threaded holes of the first mounting bosses to connect and fix the first housing, the first conductive busbar, the second conductive busbar, and the second housing respectively. The second sealing ribs are located on both sides of the first mounting bosses and are connected to the outer surfaces of the first mounting bosses.

8. The high withstand current closing device according to claim 7, characterized in that, A second mounting boss and a first mounting countersunk hole for the second mounting boss to nest are provided at the contact surface where the first housing and the second housing directly contact each other. The second mounting boss and the first mounting countersunk hole are provided with threaded holes. Screws pass through the second mounting boss and the first mounting countersunk hole to connect the first housing and the second housing. The first mounting countersunk hole and the first mounting boss are respectively connected to the first sealing rib and the first sealing groove on their opposite outer sides.

9. The high withstand current closing device according to any one of claims 1 to 8, characterized in that, The terminals of the first and second conductive busbars, as well as the end located inside the housing, are folded double-layer structures. The end of the first conductive busbar located inside the housing is suspended in the displacement path of the piston. The side of the second conductive busbar located inside the housing facing the piston is bent to form a limiting structure. When the end of the first conductive busbar located inside the housing is displaced and makes conductive contact with the end of the second conductive busbar, the end of the first conductive busbar abuts against the limiting structure of the second conductive busbar.

10. The high withstand current closing device according to claim 9, characterized in that, The end of the piston facing the first and second conductive bars is configured as a door-shaped hook structure, and the first conductive bar passes through the door-shaped hook structure of the piston.

Images