Smoke and fire switch

Abstract

The invention relates to the field of switches, in particular to a firework switch which comprises a shell, a busbar and a trigger device, the busbar is connected to the shell, a mounting cavity is formed in the surface of the shell, the busbar divides the mounting cavity into a trigger section and an arc extinguishing section, the trigger device comprises a circuit breaking assembly and an arc extinguishing assembly, the circuit breaking assembly is connected to the inner wall of the trigger section, and the arc extinguishing assembly is connected to the inner wall of the arc extinguishing section. The circuit breaking assembly impacts the busbar to break to form circuit breaking when detecting short circuit or overlarge current, the arc extinguishing assembly comprises a plurality of arc extinguishing blocks, the plurality of arc extinguishing blocks are connected to the inner wall of the arc extinguishing section at intervals, and electric arc generated at the initial moment of busbar breaking impacts the surfaces of the arc extinguishing blocks for cooling to achieve arc extinguishing. Through the arrangement of the arc extinguishing block, the surface of the arc extinguishing block is impacted by an electric arc generated at the initial moment of disconnection of the busbar, and the arc extinguishing block cools the electric arc to realize an arc extinguishing effect, so that a worker is not liable to be influenced by intense radiation and high temperature of the electric arc, safety accidents such as fire disasters or explosion are avoided, and the use safety of the smoke and fire switch is improved.

Description

Technical Field

[0001] The present application relates to the field of switches, and in particular to a pyrotechnic switch. Background Art

[0002] The pyrotechnic switch is a safety power-off switch based on pyrotechnic technology. It mainly achieves the rapid disconnection of the circuit through the explosion of pyrotechnic agents. When an electric vehicle encounters an emergency such as a collision or short circuit, the pyrotechnic switch will receive a signal and then ignite the pyrotechnic agent within milliseconds to produce high-temperature and high-pressure gas. These gases expand rapidly and push the mechanical structure inside the switch to move, causing the circuit to be quickly disconnected, preventing the current from causing harm to personnel, thereby protecting the electrical system and passenger safety.

[0003] When the pyrotechnic switch is triggered, the pyrotechnic agent will burn rapidly and produce a large amount of gas and heat. At the same time, free electrons are generated at the initial moment when the contacts are disconnected. These free electrons are pulled out of the metal surface under the action of strong electric field force to form an initial arc. The strong radiation and high temperature of the arc may pose a danger to personnel and even cause safety accidents such as fire or explosion, thereby reducing the safety of the use of the pyrotechnic switch. Summary of the invention

[0004] In order to improve the safety problem of using a pyrotechnic switch, the present application provides a pyrotechnic switch.

[0005] The present application provides a pyrotechnic switch, which adopts the following technical solution: A pyrotechnic switch comprises a shell, a busbar and a trigger device, wherein the busbar is connected to the shell, a mounting cavity is provided on the surface of the shell, the busbar divides the mounting cavity into a trigger section and an arc extinguishing section, the trigger device comprises a circuit breaker assembly and an arc extinguishing assembly, the circuit breaker assembly is connected to the inner wall of the trigger section, when the circuit breaker assembly detects a short circuit or an excessive current, the busbar is impacted to break to form a short circuit, the arc extinguishing assembly comprises a plurality of arc extinguishing blocks, a plurality of the arc extinguishing blocks are connected to the inner wall of the arc extinguishing section at intervals, the arc generated at the initial moment of the busbar being broken impacts the surface of the arc extinguishing block for cooling to achieve arc extinguishing.

[0006] By adopting the above technical solution, the busbar divides the installation cavity into a trigger section and an arc extinguishing section. When the circuit breaker component detects a short circuit or excessive current, it impacts the busbar to break and form a circuit breaker. At the same time, multiple arc extinguishing blocks are connected at intervals on the inner wall of the arc extinguishing section. The arc generated at the initial moment of busbar breaking impacts the surface of the arc extinguishing block. The arc extinguishing block cools the arc to achieve the arc extinguishing effect, making the staff less susceptible to the strong radiation and high temperature of the arc, avoiding the occurrence of safety accidents such as fire or explosion, thereby improving the safety of the use of pyrotechnic switches.

[0007] Optionally, the arc extinguishing assembly also includes a guide ring and an insulating block, the guide ring is connected to the inner wall of the arc extinguishing segment, a plurality of arc extinguishing blocks surround the outer circumference of the guide ring, one end of the insulating block is connected to the surface of the busbar, and the other end of the insulating block abuts against the ring surface of the guide ring. When the circuit breaker assembly impacts the busbar to break and form a circuit breaker, the outer circumference of the guide ring guides the arc to impact the surface of the arc extinguishing block.

[0008] By adopting the above technical solution, one end of the insulating block is connected to the surface of the busbar, and the other end of the insulating block abuts against the surface of the guide ring, so that the current passing through the busbar is not easy to enter the guide ring, thereby ensuring the stability of the current transmitted by the busbar; at the same time, multiple arc extinguishing blocks surround the outer circumference of the guide ring, and the outer circumference of the guide ring guides the arc to impact the surface of the arc extinguishing block. The arc extinguishing block cools the arc to achieve the purpose of arc extinguishing, thereby improving the arc extinguishing effect on the pyrotechnic switch.

[0009] Optionally, a fracture ring groove is provided on the surface of the busbar, and when the circuit breaker assembly impacts the surface of the busbar, the inner wall of the fracture ring groove guides the busbar to fracture.

[0010] By adopting the above technical solution, the fracture ring groove reduces the thickness of the busbar. When the circuit breaker assembly impacts the busbar surface, the inner wall of the fracture ring groove guides the busbar to break, thereby improving the stability of the fireworks switch circuit breaker.

[0011] Optionally, a plurality of limiting cavities for embedding arc extinguishing blocks are provided at intervals on the inner wall of the arc extinguishing segment, and the inner wall of the limiting cavity abuts against the surface of the arc extinguishing block to form a limit.

[0012] By adopting the above technical solution, the inner wall of the limiting cavity abuts against the surface of the arc extinguishing block to form a limit, so that the arc extinguishing block is not easily offset in the limiting cavity, thereby improving the stability of the arc extinguishing block limiting on the inner wall of the arc extinguishing section.

[0013] Optionally, the circuit breaker assembly includes an insulating piston, a coating block, a powder box and a lead, the coating block is connected to the inner wall of the trigger section, the coating block has a positioning cavity for accommodating the powder box, one end of the lead is connected to the powder box, the other end of the lead is passed through a shell for connection with a connector, the insulating piston is slidably connected to the inner wall of the trigger section, the insulating piston is located between the coating block and the busbar, when the lead detects a short circuit or excessive current, the lead detonates the powder box to explode and generate high-temperature and high-pressure gas, the insulating piston is pressed to slide toward the busbar, and the insulating piston impacts the busbar to break and form a circuit breaker.

[0014] By adopting the above technical solution, one end of the lead is connected to the powder box, and the other end of the lead is connected to the connecting piece. When the lead detects a short circuit or excessive current, the lead detonates the powder box to explode and generate high-temperature and high-pressure gas. The insulating piston is located between the sheath block and the busbar, and the air pressure in the trigger section increases. The insulating piston is pressed and slides toward the busbar. The insulating piston impacts the surface of the busbar and breaks to form a circuit break, thereby realizing precise circuit breaking of the pyrotechnic switch.

[0015] Optionally, a plurality of heat dissipation grooves are provided at intervals on the surface of the shell.

[0016] By adopting the above technical solution, a plurality of heat dissipation slots are distributed at intervals on the surface of the shell, and the heat dissipation slots are in full contact with the air and perform heat exchange, thereby releasing heat energy and improving the heat dissipation efficiency of the shell.

[0017] Optionally, the shell is connected to a positioning assembly, which includes a positioning bar, and the trigger section is provided with a sliding cavity towards the inner wall of the coating block for the positioning bar to slide, the sliding direction of the positioning bar and the sliding direction of the insulating piston are perpendicular to each other, and the surface of the coating block is provided with a fixed cavity for the end of the positioning bar to be embedded.

[0018] By adopting the above technical solution, when the coating block is embedded in the inner cavity of the trigger segment, the sliding cavity is connected to the fixed cavity, driving the positioning bar to slide along the inner wall of the sliding cavity toward the fixed cavity, and the end of the positioning bar is embedded in the fixed cavity. The outer peripheral surface of the positioning bar presses against the inner wall of the fixed cavity to form a limit, making it difficult for the coating block to slide along the inner wall of the trigger segment, thereby improving the limiting stability of the coating block on the inner wall of the trigger segment.

[0019] Optionally, the positioning assembly also includes an elastic member 1, one end of the elastic member 1 in the elastic force direction is connected to the inner wall of the sliding cavity, and the other end of the elastic member 1 in the elastic force direction is connected to the surface of the positioning strip. The elastic member 1 has an elastic force that drives the positioning strip to slide toward the direction close to the fixed cavity, and the end of the positioning strip tends to be embedded in the fixed cavity.

[0020] By adopting the above technical solution, when the covering block is embedded in the inner wall of the trigger section, the fixed cavity is connected to the sliding cavity, and the elastic force of the elastic member drives the positioning bar to slide toward the fixed cavity. The end of the positioning bar is embedded in the fixed cavity, and the outer peripheral surface of the positioning bar is pressed against the inner wall of the fixed cavity to form a limit, thereby realizing the directional sliding of the positioning bar.

[0021] Optionally, the positioning assembly also includes an opening and closing plate, and the inner wall of the sliding cavity is provided with an opening and closing cavity for the opening and closing plate to slide, the sliding direction of the opening and closing plate and the sliding direction of the insulating piston are parallel to each other, the surface of the opening and closing plate abuts against the surface of the positioning strip and limits the positioning strip to the sliding cavity, and the surface of the covering block facing the insulating piston is provided with a starting groove for the end of the inner wall of the protruding trigger section of the opening and closing plate to be embedded.

[0022] By adopting the above technical scheme, the surface of the opening and closing plate abuts against the surface of the positioning strip and limits the positioning strip to the sliding cavity. When the covering block is embedded in the inner wall of the trigger section, the end of the opening and closing plate protruding from the inner wall of the trigger section is embedded in the starting groove. The inner wall of the starting groove abuts against the end face of the opening and closing plate to form a limit. The covering block drives the opening and closing plate to slide along the inner wall of the opening and closing cavity in the direction away from the sliding cavity. The limiting effect of the opening and closing plate on the positioning strip disappears, and the sliding cavity is connected to the fixed cavity. The elastic force of the elastic member drives the positioning strip to slide in the direction close to the fixed cavity, thereby realizing the directional connection between the sliding cavity and the trigger section.

[0023] Optionally, the positioning assembly also includes an elastic member 2, one end of the elastic member 2 in the elastic force direction is connected to the surface of the opening and closing plate, and the other end of the elastic member 2 in the elastic force direction is connected to the inner wall of the opening and closing cavity. The elastic member 2 has an elastic force that drives the opening and closing plate to slide toward the direction close to the sliding cavity, and the surface of the opening and closing plate abuts against the surface of the positioning strip and limits the positioning strip to the sliding cavity.

[0024] By adopting the above technical solution, the positioning bar is driven to slide along the inner wall of the sliding cavity toward the direction close to the sliding cavity, and the end face of the positioning bar is flush with the inner wall of the opening and closing cavity. The second elastic force of the elastic member drives the opening and closing plate to slide along the inner wall of the opening and closing cavity toward the direction close to the sliding cavity. The opening and closing plate surface abuts against the surface of the positioning bar and limits the positioning bar in the sliding cavity. There is no need for staff to drive the opening and closing plate to slide, and directional sliding of the opening and closing plate is achieved, thereby improving the assembly efficiency of the fireworks switch.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. The setting of arc extinguishing block. The arc generated at the initial moment of busbar disconnection impacts the surface of the arc extinguishing block. The arc extinguishing block cools the arc to achieve the arc extinguishing effect, making the staff less susceptible to the strong radiation and high temperature of the arc, avoiding the occurrence of safety accidents such as fire or explosion, thereby improving the safety of the use of pyrotechnic switches; 2. The guide ring and the insulating block are arranged, and a plurality of arc extinguishing blocks surround the outer circumference of the guide ring. The outer circumference of the guide ring guides the arc to impact the surface of the arc extinguishing block. The arc extinguishing block cools the arc to achieve the purpose of arc extinguishing, thereby improving the arc extinguishing effect of the pyrotechnic switch; 3. The setting of the fracture ring groove, the inner wall of the fracture ring groove guides the busbar to fracture, thereby improving the stability of the fireworks switch circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure in the embodiment of the present application.

[0027] Figure 2 It is a cross-sectional view in an embodiment of the present application.

[0028] Figure 3 It is a schematic diagram of the overall structure of the fixing part in the embodiment of the present application.

[0029] Figure 4 It is a schematic diagram of the overall structure of the base in the embodiment of the present application.

[0030] Figure 5 yes Figure 2 Enlarged view of point A in the middle.

[0031] Figure 6 yes Figure 2 Enlarged view of point B in the middle.

[0032] Description of reference numerals: 1. housing; 11. cover; 111. threaded hole; 112. mounting cavity; 1121. trigger section; 1122. arc extinguishing section; 12. fixing portion; 121. limit cavity; 122. sliding cavity; 123. impact cavity; 124. opening and closing cavity; 13. base; 131. heat dissipation groove; 2. busbar; 21. mounting hole; 22. fracture ring groove; 23. positioning groove; 3. trigger device; 31. circuit breaker assembly; 311. insulating piston; 31 2. Coating block; 3121. Fixing cavity; 3122. Starting groove; 3123. Positioning cavity; 313. Powder box; 314. Lead wire; 32. Arc extinguishing assembly; 321. Guide ring; 322. Insulating block; 323. Arc extinguishing block; 4. Positioning assembly; 41. Positioning strip; 42. Elastic part 1; 43. Force block; 44. Opening and closing plate; 45. Elastic part 2; 5. Impact assembly; 51. Connecting rod 1; 52. Connecting rod 2; 53. Impact rod; 54. Elastic part 3. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-6 This application is described in further detail.

[0034] The present application embodiment discloses a pyrotechnic switch. Figure 1 and Figure 2A pyrotechnic switch includes a housing 1, a busbar 2 and a trigger device 3. The housing 1 includes a cover 11, a fixing portion 12 and a base 13. The surfaces of the cover 11, the fixing portion 12 and the base 13 are spaced apart with a plurality of threaded holes 111 for bolts to penetrate. The ends of the bolts penetrate the threaded holes 111 on the cover 11 and the threaded holes 111 on the fixing portion 12 in sequence and are screwed and fixed to the inner wall of the threaded holes 111 on the base 13 to form the housing 1. An installation cavity 112 is reserved between the cover 11, the fixing portion 12 and the base 13. The busbar 2 is integrally formed and fixed on the surface of the fixing portion 12. The surface of the busbar 2 protruding from the fixing portion 12 is provided with an installation hole 21 for main circuit installation. The busbar 2 separates the installation cavity 112 into a The triggering section 1121 is located between the fixing portion 12 and the cover 11, and the arc extinguishing section 1122 is located between the fixing portion 12 and the base 13. The triggering device 3 includes a circuit breaker assembly 31 and an arc extinguishing assembly 32. The circuit breaker assembly 31 is installed on the inner wall of the triggering section 1121, and the arc extinguishing assembly 32 is installed on the inner wall of the arc extinguishing section 1122. When the circuit breaker assembly 31 detects a short circuit or an excessive current, the busbar 2 is impacted to break and a short circuit is formed. The arc extinguishing assembly 32 can cool the arc generated at the initial moment of the busbar 2 being disconnected to extinguish the arc, so that the staff is not easily affected by the strong radiation and high temperature of the arc, and the occurrence of safety accidents such as fire or explosion is avoided, thereby improving the safety of the use of the pyrotechnic switch.

[0035] Reference Figure 1 and Figure 2 The circuit breaker assembly 31 includes an insulating piston 311, a coating block 312, a powder box 313 and a lead 314. The end of the lead 314 is fixed on the powder box 313. In the embodiment of the present application, the coating block 312 is made of plastic. The coating block 312 has a positioning cavity 3123 for accommodating the powder box 313. The inner wall of the positioning cavity 3123 is pressed against the outer peripheral surface of the powder box 313 to form a limit, so as to realize the rapid installation between the powder box 313 and the coating block 312. The coating block 312 is glued to the outer peripheral surface of the powder box 313. The material is injection molded and coated on the outer peripheral surface of the gunpowder box 313 and cooled, and the end of the lead 314 protrudes from the outer wall of the coating block 312, and the coating block 312 is embedded in the inner cavity of the trigger section 1121. The outer peripheral surface of the coating block 312 is pressed against the inner wall of the trigger section 1121 to form a limit, so that the coating block 312 is fixed on the inner wall of the trigger section 1121, and the end of the lead 314 protrudes from the covering cover 11 for the installation of the connector. The lead 314 can detect a short circuit or excessive current and trigger the gunpowder box 313 to explode.

[0036] Reference Figure 1 and Figure 2The insulating piston 311 may be made of rubber or silicone. In the embodiment of the present application, the insulating piston 311 is made of rubber, which has a certain deformation ability. The insulating piston 311 is embedded in the inner cavity of the trigger section 1121, and the outer peripheral surface of the insulating piston 311 is pressed against the inner wall of the trigger section 1121 to form a limit. The insulating piston 311 is located between the busbar 2 and the coating block 312, and the powder box 313 is located on the side of the coating block 312 close to the insulating piston 311; when the powder box 313 explodes, high-temperature and high-pressure gas is generated in the trigger section 1121, and the insulating piston 311 slides toward the direction close to the busbar 2 under the influence of the high pressure. The insulating piston 311 impacts the surface of the busbar 2 and drives the busbar 2 to break to form a circuit break, thereby realizing the precise circuit breaking of the pyrotechnic switch.

[0037] Reference Figure 1 and Figure 2 The busbar 2 has a fracture ring groove 22 on its surface facing the arc extinguishing section 1122 and on its surface facing the triggering section 1121. The insulating ring groove reduces the thickness of the busbar 2. When the insulating piston 311 impacts the surface of the busbar 2, the inner wall of the fracture ring groove 22 guides the busbar 2 surface to fracture. Reference Figure 2 and Figure 3 The arc extinguishing assembly 32 includes a guide ring 321, an insulating block 322 and a plurality of arc extinguishing blocks 323. In the embodiment of the present application, the insulating block 322 is made of plastic. A positioning groove 23 for the end of the insulating block 322 to be embedded is provided on the surface of the busbar 2 facing the arc extinguishing section 1122. The outer peripheral surface of the insulating block 322 is pressed against the inner wall of the positioning groove 23 to form a limit, thereby realizing the installation of the insulating block 322 and the busbar 2. In the embodiment of the present application, the guide ring 321 is made of aluminum, and the guide ring 321 is embedded in the arc extinguishing section 1122. The guide ring 321 is located on the side of the insulating block 322 away from the busbar 2, one end of the guide ring 321 in the axial direction is pressed against the inner wall of the arc extinguishing section 1122, and the other end of the guide ring 321 in the axial direction is pressed against the annular surface of the guide ring 321. The inner wall of the arc extinguishing section 1122 and the surface of the insulating block 322 clamp the two ends of the guide ring 321 in the axial direction to form a limit, so that the guide ring 321 is not easy to deviate in the arc extinguishing section 1122, thereby improving the limit stability of the guide ring 321 in the arc extinguishing section 1122.

[0038] Reference Figure 2 and Figure 3In the embodiment of the present application, the arc extinguishing block 323 is made of steel. The fixing portion 12 is provided with a plurality of limiting cavities 121 spaced apart from each other toward the inner wall of the arc extinguishing section 1122 for the arc extinguishing blocks 323 to be embedded. The inner wall of the limiting cavity 121 is pressed against the surface of the arc extinguishing block 323 to form a limit, so that the arc extinguishing block 323 is not easily displaced on the inner wall of the arc extinguishing section 1122, thereby improving the limiting stability of the arc extinguishing block 323 on the inner wall of the arc extinguishing section 1122; a plurality of arc extinguishing blocks 323 surround the outer circumference of the guide ring 321; when the insulating piston 311 impacts the surface of the busbar 2 and drives the busbar 2 to break and form a short circuit, the arc generated at the initial moment of disconnection of the busbar 2 impacts the outer circumference of the arc extinguishing block 323 along the outer circumference of the guide ring 321, and the arc extinguishing block 323 cools the arc to extinguish the arc, thereby improving the arc extinguishing efficiency of the pyrotechnic switch.

[0039] Reference Figure 2 and Figure 4 A plurality of heat dissipation grooves 131 are spaced apart on the end surface of the base 13 facing the arc extinguishing block 323. The inner wall of the heat dissipation groove 131 is in full contact with the air and performs heat exchange, thereby increasing the contact area between the base 13 and the air, thereby improving the cooling efficiency of the pyrotechnic switch.

[0040] Reference Figure 2 and Figure 5 The fixing portion 12 is provided with a positioning assembly 4, which can limit the covering block 312 to the inner wall of the trigger section 1121. The positioning assembly 4 includes a positioning strip 41, an elastic member 1 42, a force block 43, an opening and closing plate 44 and an elastic member 2 45. The fixing portion 12 is provided with a sliding cavity 122 for sliding the positioning strip 41 on the inner wall of the trigger section 1121. The sliding direction of the positioning strip 41 and the sliding direction of the insulating piston 311 are perpendicular to each other. The surface of the covering block 312 facing the sliding cavity 122 is provided with a fixed cavity 3121 for embedding the end of the positioning strip 41. The elastic member 1 42 and the elastic member 2 45 can be compression springs or tension springs. In the embodiment of the present application, the elastic Component 1 42 and elastic component 2 45 are both compression springs with a certain deformation ability. One end of the elastic component 42 in the elastic direction is fixed to the inner wall of the sliding cavity 122, and the other end of the elastic component 42 in the elastic direction is fixed to the end face of the positioning strip 41. The elastic component 42 has elastic force to drive the positioning strip 41 to slide along the inner wall of the sliding cavity 122 toward the fixed cavity 3121, and the end of the positioning strip 41 tends to be embedded in the fixed cavity 3121. The outer peripheral surface of the positioning strip 41 presses against the inner wall of the fixed cavity 3121 to form a limit, so that the covering block 312 is not easy to deviate on the inner wall of the trigger section 1121, thereby improving the limiting stability of the covering block 312 on the inner wall of the trigger section 1121.

[0041] Reference Figure 2 and Figure 5One end of the force block 43 is fixed to the surface of the positioning strip 41, and the other end of the force block 43 protrudes from the surface of the fixed part 12 for the staff to hold. The force block 43 provides a force point for the staff, so that it is convenient for the staff to control the positioning strip 41 to slide on the inner wall of the sliding cavity 122, thereby improving the assembly efficiency of the pyrotechnic switch; the inner wall of the sliding cavity 122 is provided with an opening and closing cavity 124 for the opening and closing plate 44 to slide, and the sliding direction of the opening and closing plate 44 and the sliding direction of the insulating piston 311 are parallel to each other. One end of the elastic member 45 in the elastic direction is fixed to the inner wall of the opening and closing cavity 124, and the other end of the elastic member 45 in the elastic direction is fixed to the board surface of the opening and closing plate 44. The elastic member 45 has the elastic force to drive the opening and closing plate 44 to slide in the direction close to the sliding cavity 122, and the board surface of the opening and closing plate 44 presses against the surface of the positioning strip 41 and limits the positioning strip 41 to the sliding cavity 122.

[0042] Reference Figure 2 and Figure 5 The surface of the covering block 312 facing the insulating piston 311 is provided with a starting groove 3122 for the end of the opening and closing plate 44 protruding from the inner wall of the trigger section 1121 to be embedded. When the covering block 312 is embedded in the trigger section 1121, the end of the opening and closing plate 44 protruding from the inner wall of the contact section is embedded in the starting groove 3122, and the inner wall of the starting groove 3122 is pressed against the outer wall of the covering block 312 to form a limit. At the same time, the covering block 312 drives the opening and closing plate 44 to move along the inner wall of the opening and closing cavity 124 in a direction away from the sliding cavity 122. The sliding movement causes the pressing force between the opening and closing plate 44 and the surface of the positioning strip 41 to disappear, and the fixed cavity 3121 is connected to the sliding cavity 122. The elastic force of the elastic member 42 drives the positioning strip 41 to slide toward the fixed cavity 3121, and the end of the positioning strip 41 is embedded in the fixed cavity 3121. The outer peripheral surface of the positioning strip 41 presses against the inner wall of the fixed cavity 3121 to form a limit, so that the covering block 312 is not easy to deviate in the trigger segment 1121, thereby improving the sealing stability of the trigger segment 1121.

[0043] Reference Figure 2 and Figure 6 The fixed part 12 is equipped with an impact assembly 5, which can impact the inner wall of the fracture ring groove 22 and drive the busbar 2 to break and form a short circuit. The impact assembly 5 includes a connecting rod 1 51, a connecting rod 2 52, an impact rod 53 and an elastic member 3 54. The fixed part 12 is located inside the trigger section 1121 and is provided with an impact cavity 123 for the impact rod 53 to slide. The sliding direction of the impact rod 53 and the sliding direction of the insulating piston 311 are parallel to each other. The impact end of the impact rod 53 faces the inner wall of the fracture ring groove 22. The elastic member 3 54 can be a compression spring or a tension spring. In the embodiment of the present application, the elastic member 3 54 is a compression spring with a certain deformation ability. One end of the elastic member 3 54 in the elastic direction is connected to the inner wall of the impact cavity 123, and the other end of the elastic member 3 54 in the elastic direction is connected to the rod surface of the impact rod 53. The elastic member 3 54 has a tendency of elastic force driving the impact rod 53 to slide in the direction away from the fracture ring groove 22.

[0044] Reference Figure 2 and Figure 6 One end of the connecting rod 51 is rotatably connected to the inside of the impact cavity 123, and the other end of the connecting rod 51 is rotatably connected to the end face of the connecting rod 2 52. The end of the connecting rod 2 52 away from the connecting rod 1 51 is rotatably connected to the rod face of the impact rod 53, and the end of the connecting rod 1 51 and the connecting rod 2 52 hingedly protrudes from the inner wall of the trigger section 1121; when the insulating piston 311 slides toward the direction close to the busbar 2 under the influence of the high pressure in the trigger section 1121, the surface of the insulating piston 311 abuts against the end face of the connecting rod 1 51 and drives the connecting rod 1 51 to rotate toward the direction close to the impact cavity 123, driving the connecting rod 2 52 to rotate toward the direction close to the impact cavity 123, driving the impact rod 53 along the inner wall of the impact cavity 123 to overcome the elastic force of the elastic member 3 54 and approach the fracture ring groove 22, the impact end of the impact rod 53 impacts the inner wall of the fracture ring groove 22, and drives the inner wall of the fracture ring groove 22 to fracture to form a busbar 2 circuit breaker, thereby improving the efficiency of busbar 2 rupture.

[0045] The implementation principle of a pyrotechnic switch in the embodiment of the present application is as follows: when the pyrotechnic switch is in use, the end of the lead wire 314 protrudes from the cover 11 for installation of the connector, and the lead wire 314 can detect a short circuit or an excessive current and trigger the explosion of the powder box 313, and high-temperature and high-pressure gas is generated in the trigger section 1121. The insulating piston 311 slides toward the direction close to the busbar 2 under the influence of the high pressure, and the insulating piston 311 impacts the surface of the busbar 2 and drives the busbar 2 to break to form a short circuit; at the same time, the arc generated at the initial moment of disconnection of the busbar 2 impacts the outer peripheral surface of the arc extinguishing block 323 along the outer peripheral surface of the guide ring 321, and the arc extinguishing block 323 cools the arc to extinguish the arc, thereby improving the arc extinguishing efficiency of the pyrotechnic switch, making the staff less susceptible to the strong radiation and high temperature of the arc, avoiding the occurrence of safety accidents such as fire or explosion, and thus improving the safety of the use of the pyrotechnic switch.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pyrotechnic switch, characterized in that: The invention comprises a housing (1), a busbar (2) and a trigger device (3), wherein the busbar (2) is connected to the housing (1), a mounting cavity (112) is provided on the surface of the housing (1), the busbar (2) divides the mounting cavity (112) into a trigger section (1121) and an arc extinguishing section (1122), the trigger device (3) comprises a circuit breaker component (31) and an arc extinguishing component (32), the circuit breaker component (31) is connected to the inner wall of the trigger section (1121), when the circuit breaker component (31) detects a short circuit or an excessive current, it impacts the busbar (2) to break and form a short circuit, the arc extinguishing component (32) comprises a plurality of arc extinguishing blocks (323), the plurality of arc extinguishing blocks (323) are connected to the inner wall of the arc extinguishing section (1122) at intervals, and the arc generated at the initial moment of the busbar (2) being broken impacts the surface of the arc extinguishing block (323) for cooling to achieve arc extinguishing.

2. A pyrotechnic switch according to claim 1, characterized in that: The arc extinguishing assembly (32) further comprises a guide ring (321) and an insulating block (322); the guide ring (321) is connected to the inner wall of the arc extinguishing section (1122); a plurality of arc extinguishing blocks (323) surround the outer peripheral surface of the guide ring (321); one end of the insulating block (322) is connected to the surface of the busbar (2); the other end of the insulating block (322) abuts against the ring surface of the guide ring (321); when the circuit breaker assembly (31) impacts the busbar (2) to break and form a circuit breaker, the outer peripheral surface of the guide ring (321) guides the arc to impact the surface of the arc extinguishing block (323).

3. A pyrotechnic switch according to claim 1, characterized in that: The busbar (2) is provided with a fracture annular groove (22) on its surface. When the circuit breaker assembly (31) impacts the busbar (2) surface, the inner wall of the fracture annular groove (22) guides the busbar (2) to fracture.

4. A pyrotechnic switch according to claim 1, characterized in that: The inner wall of the arc extinguishing section (1122) is provided with a plurality of limiting cavities (121) for the arc extinguishing blocks (323) to be embedded, and the inner wall of the limiting cavity (121) abuts against the surface of the arc extinguishing blocks (323) to form a limit.

5. A pyrotechnic switch according to claim 1, characterized in that: The circuit breaker assembly (31) comprises an insulating piston (311), a coating block (312), a powder box (313) and a lead wire (314); the coating block (312) is connected to the inner wall of the trigger section (1121); the coating block (312) has a positioning cavity (3123) for accommodating the powder box (313); one end of the lead wire (314) is connected to the powder box (313); the other end of the lead wire (314) passes through the housing (1) for connection with a connecting piece; The piston (311) is slidably connected to the inner wall of the trigger section (1121), and the insulating piston (311) is located between the covering block (312) and the busbar (2). When the lead (314) detects a short circuit or an excessive current, the lead (314) detonates the powder box (313) to explode and generate high-temperature and high-pressure gas, and the insulating piston (311) is pressed to slide in a direction close to the busbar (2), and the insulating piston (311) impacts the busbar (2) to break and form a short circuit.

6. A pyrotechnic switch according to claim 1, characterized in that: A plurality of heat dissipation slots (131) are provided at intervals on the surface of the housing (1).

7. A pyrotechnic switch according to claim 5, characterized in that: The housing (1) is connected to a positioning assembly (4), the positioning assembly (4) comprising a positioning strip (41), the trigger section (1121) is provided with a sliding cavity (122) on the inner wall facing the covering block (312) for the positioning strip (41) to slide, the sliding direction of the positioning strip (41) and the sliding direction of the insulating piston (311) are perpendicular to each other, and the surface of the covering block (312) is provided with a fixing cavity (3121) for the end of the positioning strip (41) to be embedded.

8. A pyrotechnic switch according to claim 7, characterized in that: The positioning assembly (4) further comprises an elastic member 1 (42), one end of the elastic member 1 (42) in the elastic force direction is connected to the inner wall of the sliding cavity (122), and the other end of the elastic member 1 (42) in the elastic force direction is connected to the surface of the positioning strip (41), and the elastic member 1 (42) has an elastic force that drives the positioning strip (41) to slide in a direction close to the fixed cavity (3121), and the end of the positioning strip (41) has a tendency to be embedded in the fixed cavity (3121).

9. A pyrotechnic switch according to claim 8, characterized in that: The positioning assembly (4) further comprises an opening and closing plate (44); an opening and closing cavity (124) for sliding of the opening and closing plate (44) is provided on the inner wall of the sliding cavity (122); a sliding direction of the opening and closing plate (44) and a sliding direction of the insulating piston (311) are parallel to each other; a plate surface of the opening and closing plate (44) abuts against a surface of the positioning strip (41) and limits the positioning strip (41) in the sliding cavity (122); and a starting groove (3122) for the end of the protruding inner wall of the trigger section (1121) of the opening and closing plate (44) to be embedded is provided on the surface of the covering block (312) facing the insulating piston (311).

10. A pyrotechnic switch according to claim 9, characterized in that: The positioning assembly (4) further comprises a second elastic member (45), one end of the second elastic member (45) in the elastic direction is connected to the surface of the opening and closing plate (44), and the other end of the second elastic member (45) in the elastic direction is connected to the inner wall of the opening and closing cavity (124). The second elastic member (45) has an elastic force that drives the opening and closing plate (44) to slide in a direction close to the sliding cavity (122), and the surface of the opening and closing plate (44) abuts against the surface of the positioning strip (41) and limits the positioning strip (41) in the sliding cavity (122).

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