Multi-sparker pyrotechnic power-off device and control method

Abstract

The application provides a multi-igniter pyrotechnic power-off device and a control method. A synchronous triggering module is electrically connected with a plurality of igniters, and the gas output sides of the plurality of igniters are communicated with a pressure equalization cavity; the pressure equalization cavity is communicated with piston accommodating cavities where a plurality of pistons are located through a plurality of parallel exhaust holes; the plurality of pistons correspond to a plurality of parallel conductors of a conductive copper bar one by one; a plurality of arc extinguishing narrow gaps correspond to the plurality of parallel conductors one by one, and a plurality of metal mesh groups correspond to and are communicated with the plurality of arc extinguishing narrow gaps one by one. The control method sequentially performs synchronous triggering of the plurality of igniters, high-pressure gas convergence and pressure equalization, shunt output of the equalized high-pressure gas, corresponding driving of the plurality of pistons, corresponding breaking and corresponding arc extinguishing of the plurality of parallel conductors, thereby improving the breaking consistency of the plurality of parallel conductors.

Description

Technical Field

[0001] This application belongs to the technical field of circuit protection devices, specifically relating to a multi-point ignition device pyrotechnic type circuit breaker and its control method. Background Technology

[0002] The pyrotechnic circuit breaker uses an ignition device to generate high-pressure gas, which drives a piston to break the conductive component and extinguish the arc generated when the conductive component breaks, thereby achieving rapid circuit disconnection.

[0003] For circuit breakers that use multiple parallel conductors to carry current, each conductor needs to be broken individually. If only igniters and pistons are added, the triggering time of each igniter, the high-pressure gas output state, and the driving force on each piston may differ, easily causing asynchronous piston movements and preventing the parallel conductors from breaking at similar times. If some parallel conductors break first, current will transfer to the remaining conductors, generating multiple arcs, thus affecting the reliability of the circuit breaker's circuit breaking function.

[0004] Therefore, existing pyrotechnic circuit breakers have the problem of difficulty in coordinating the multiple triggering, driving, breaking and arc extinguishing processes when cutting multiple parallel conductors. Summary of the Invention

[0005] The purpose of this application is to provide a multi-point ignition device pyrotechnic circuit breaker and control method to overcome the technical problem in the prior art that when cutting multiple parallel conductors, the multi-path triggering, driving, breaking and arc extinguishing processes are difficult to coordinate, resulting in multiple parallel conductors not being reliably disconnected.

[0006] To achieve the above objectives, this application adopts the following technical solution: In a first aspect, this application provides a multi-point ignition device pyrotechnic circuit breaker, comprising: The upper cover, power chamber, drive chamber, conductive copper busbar, narrow slot arc-extinguishing chamber, and metal mesh arc-extinguishing chamber are assembled sequentially. The upper cover is provided with a synchronous triggering module, the power chamber is provided with a pressure equalization chamber and multiple igniters, the gas output side of the multiple igniters is connected to the pressure equalization chamber, the synchronous triggering module is electrically connected to the multiple igniters respectively, and synchronously outputs triggering signals to the multiple igniters; The drive chamber is provided with multiple piston receiving chambers, and a piston is movably disposed in each piston receiving chamber. The pressure equalization chamber is connected to the multiple piston receiving chambers through multiple parallel exhaust holes. The conductive copper busbar includes multiple parallel conductors, each of which corresponds to one of the multiple pistons. Each of the parallel conductors is provided with a weakening groove located on the corresponding piston's movement path. The narrow-slit arc-extinguishing chamber has multiple arc-extinguishing narrow slits, each of which corresponds to one of the multiple parallel conductors; the metal mesh arc-extinguishing chamber is provided with multiple metal mesh groups, each of which corresponds to and is connected to one of the multiple arc-extinguishing narrow slits.

[0007] In one embodiment, each igniter includes an ignition charge, a bridge wire, an electrode plug, and two electrodes. The two electrodes are spaced apart from each other on the electrode plug. The bridge wire is disposed inside the ignition charge, and its two ends are respectively connected to the two electrodes. A plurality of bridge wires are connected in parallel to the output of the synchronous triggering module.

[0008] In one embodiment, the synchronous triggering module includes a trigger control circuit, a capacitor energy storage pulse discharge unit, and a current sharing network. The capacitor energy storage pulse discharge unit includes a boost module, an energy storage capacitor, and a high-power switching device. The boost module is connected to the energy storage capacitor, and the energy storage capacitor is connected to the current sharing network through the high-power switching device. The trigger control circuit is connected to the control terminal of the high-power switching device. The current sharing network includes multiple parallel branches that are respectively connected to multiple bridge wires.

[0009] In one embodiment, the difference in resistance between any two bridge wires is no greater than 0.1Ω.

[0010] In one embodiment, the pressure equalization chamber is provided with a plurality of flow guiding ribs, which are disposed between the gas output side of the plurality of igniters and the plurality of parallel exhaust holes, and are distributed at intervals along the circumference of the pressure equalization chamber; the plurality of parallel exhaust holes are disposed on the side of the pressure equalization chamber facing the drive chamber.

[0011] In one embodiment, a piston sealing ring is provided between the outer peripheral wall of each piston and the inner wall of the corresponding piston receiving cavity.

[0012] In one embodiment, a weakening groove is provided on each of the opposite sides of each of the parallel conductors, and the two weakening grooves are arranged opposite each other. The areas where the two weakening grooves are located together constitute the breaking part located on the corresponding piston movement path.

[0013] In one embodiment, each of the metal mesh groups includes two metal meshes spaced apart.

[0014] In one embodiment, each of the metal meshes comprises multiple layers of stacked stainless steel mesh.

[0015] Secondly, this application provides a control method for a multi-point ignition appliance pyrotechnic circuit breaker, used to control the multi-point ignition appliance pyrotechnic circuit breaker described in the first aspect, comprising: The synchronous triggering module is controlled to synchronously output trigger signals to multiple igniters, so that the high-pressure gas generated by the multiple igniters flows into the pressure equalization chamber. The high-pressure gas is pressure-equalized in the pressure equalization chamber and then enters the piston accommodating chambers through the parallel exhaust holes to drive the pistons. The pistons are caused to impact the corresponding parallel conductors along their respective movement paths, so that the parallel conductors are broken at the locations of the corresponding weakening grooves. The arc generated when multiple parallel conductors are disconnected is extinguished by the narrow slit arc-extinguishing chamber and the metal mesh arc-extinguishing chamber.

[0016] Compared with the prior art, this application has the following beneficial effects: Firstly, this application provides a multi-ignition pyrotechnic breaker. This application uses a synchronous triggering module to synchronously output trigger signals to multiple ignition devices, enabling them to generate high-pressure gas in the same triggering sequence, reducing the time difference caused by separate triggering. The high-pressure gas generated by the multiple ignition devices first converges into a pressure equalization chamber for pressure equalization, and then enters multiple piston accommodating chambers through multiple parallel exhaust holes, reducing the difference in driving force between each piston. Each piston corresponds one-to-one with a multiple parallel conductor, and the weakening groove of each parallel conductor is located on the movement path of its corresponding piston, enabling each piston to impact and disconnect its corresponding parallel conductor. Multiple arc-extinguishing slits correspond one-to-one with the multiple parallel conductors, and multiple metal mesh groups correspond one-to-one with and are connected to the multiple arc-extinguishing slits, enabling the extinguishing of arcs generated when each parallel conductor is disconnected. Therefore, this application establishes a continuous structural coordination relationship between synchronous triggering, pressure equalization, branch drive, corresponding interruption and corresponding arc extinguishing, reducing the possibility of current transfer to the parallel conductors that have not yet been interrupted after some parallel conductors are disconnected first, thereby improving the reliability of interruption and arc extinguishing of multiple parallel conductors.

[0017] Secondly, this application provides a control method for a multi-ignition pyrotechnic breaker. This application first synchronously triggers multiple ignition devices, causing the high-pressure gases generated by these devices to converge into a pressure equalization chamber. Then, the pressure-equalized high-pressure gas is separately delivered to multiple piston accommodating chambers to sequentially complete the branch-drive of multiple pistons, the corresponding interruption of multiple parallel conductors, and the extinguishing of the interrupted arc. This control method ensures that the synchronous triggering process of multiple ignition devices, the driving process of multiple pistons, the interruption process of multiple parallel conductors, and the extinguishing process of multiple arcs are interconnected. This allows the multi-ignition pyrotechnic breaker to coordinate its operation according to the working path of synchronous triggering, pressure equalization, branch-drive, corresponding interruption, and arc extinguishing, thereby improving the consistency of the interruption process of multiple parallel conductors and the reliability of the breaker's circuit disconnection. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be considered as a limitation on the scope of protection of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a cross-sectional view of the overall structure of the multi-point ignition pyrotechnic switch in the embodiments of this application; Figure 2 This is a circuit block diagram of the synchronization triggering module in the embodiments of this application; Figure 3 This is a schematic diagram of the structure of the ignition device and the bridge wire resistance matching in the embodiments of this application; Figure 4 This is a schematic diagram of the conductive copper busbar in an embodiment of this application; Figure 4 (a) in the image is a top view of the conductive copper busbar. Figure 4 (b) in the figure is a side view of the conductive copper busbar; Figure 5 This is a schematic diagram of the narrow slot arc-extinguishing chamber and the metal mesh arc-extinguishing chamber in the embodiments of this application; Figure 5 (a) in the figure is a side sectional view of the narrow slot arc-extinguishing chamber and the metal mesh arc-extinguishing chamber; Figure 5 (b) is a front sectional view of the narrow slot arc-extinguishing chamber and the metal mesh arc-extinguishing chamber; Figure 6 This is a circuit block diagram of the capacitor energy storage pulse discharge unit in the embodiments of this application; Figure 7 This is a top view of the pressure equalization chamber in an embodiment of this application.

[0020] In the diagram: 1. Top cover; 11. Synchronous trigger module; 2. Power chamber; 201. First igniter; 202. Second igniter; 211. Ignition powder; 212. Bridge wire; 213. Electrode plug; 214. Electrode; 22. Pressure equalization chamber; 23. Guide rib; 3. Drive chamber; 311. First piston; 312. Second piston; 32. Piston sealing ring; 33. Parallel exhaust port; 4. Conductive copper busbar; 41. First parallel conductor; 42. Second parallel conductor; 43. Weakening groove; 5. Narrow slit arc-extinguishing chamber; 51. First arc-extinguishing narrow slit; 52. Second arc-extinguishing narrow slit; 6. Metal mesh arc-extinguishing chamber; 61. First metal mesh group; 62. Second metal mesh group. Detailed Implementation

[0021] Pyrotechnic circuit breakers typically activate upon receiving a trigger signal. High-pressure gas generated by an igniter propels a piston, which breaks the conductive structure and extinguishes the electric arc generated during the break. When the conductive structure comprises multiple parallel current-carrying paths, multiple pistons need to be driven separately to break the corresponding paths. Differences in the actuation time or driving pressure between multiple igniters and pistons can lead to uncoordinated breaking of the parallel current-carrying paths, causing current to shift to the remaining paths and affecting the reliability of the circuit breaker.

[0022] Based on this, this application provides a multi-ignition pyrotechnic circuit breaker. Multiple ignition devices are simultaneously triggered by a synchronous triggering module, causing the high-pressure gases generated by these devices to converge into a pressure equalization chamber. After pressure equalization, multiple pistons are driven through multiple parallel exhaust holes, which then break the corresponding parallel conductors. Arc extinguishing is achieved through arc-extinguishing slits and metal mesh groups corresponding to each parallel conductor. This creates a continuous structural coordination relationship between synchronous triggering, pressure equalization, branch-driven operation, corresponding breaking, and corresponding arc extinguishing, improving the reliability of breaking and extinguishing multiple parallel conductors.

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] Example 1 See Figure 1 This embodiment provides a multi-ignition pyrotechnic breaker, comprising a top cover 1, a power chamber 2, a drive chamber 3, a conductive copper busbar 4, a narrow-slit arc-extinguishing chamber 5, and a metal mesh arc-extinguishing chamber 6, assembled sequentially. These components cooperate in sequence to form a working path from ignition triggering, gas generation, gas distribution, piston drive, conductor breakage, to arc extinguishing.

[0025] The upper cover 1 is equipped with a synchronous triggering module 11. The power chamber 2 is equipped with a pressure equalization chamber 22 and multiple igniters, and the gas output side of each igniter is connected to the pressure equalization chamber 22. The synchronous triggering module 11 is electrically connected to the multiple igniters and can synchronously output trigger signals to the multiple igniters, so that the multiple igniters generate high-pressure gas under the same triggering sequence.

[0026] See Figure 1 and Figure 7This embodiment uses two igniters as an example, namely the first igniter 201 and the second igniter 202. The gas output sides of both the first igniter 201 and the second igniter 202 are connected to the pressure equalization chamber 22. The high-pressure gases generated by the first igniter 201 and the second igniter 202 flow into the pressure equalization chamber 22, where they are combined and pressure equalized. It should be understood that the number of igniters is not limited to two; it can be set to three, four, or more depending on the number of parallel flow paths and the required driving force.

[0027] The drive chamber 3 is provided with multiple piston receiving chambers, and a piston is movably disposed in each piston receiving chamber. The pressure equalization chamber 22 is connected to multiple piston receiving chambers through multiple parallel exhaust holes 33, so that the high-pressure gas in the pressure equalization chamber 22 can enter the corresponding piston receiving chamber through the multiple parallel exhaust holes 33 and drive the corresponding piston to move.

[0028] In this embodiment, the driving chamber 3 is provided with two piston receiving chambers, and a first piston 311 and a second piston 312 are respectively disposed in the two piston receiving chambers. The pressure equalization chamber 22 is connected to the piston receiving chambers containing the first piston 311 and the second piston 312 through two parallel exhaust holes 33. Both the first piston 311 and the second piston 312 can move towards the conductive copper busbar 4 under the action of high-pressure gas.

[0029] See Figure 4 The conductive copper busbar 4 includes multiple parallel conductors, which together form the parallel current-carrying path of the circuit breaker. Each parallel conductor corresponds one-to-one with a piston, and each parallel conductor is provided with a weakening groove 43 located on the corresponding piston's movement path. The weakening groove 43 enables the parallel conductor to disconnect from a predetermined position under the impact of the corresponding piston.

[0030] In this embodiment, the conductive copper busbar 4 includes a first parallel conductor 41 and a second parallel conductor 42. The first parallel conductor 41 corresponds to the first piston 311, and the second parallel conductor 42 corresponds to the second piston 312. Both the first parallel conductor 41 and the second parallel conductor 42 are provided with weakening grooves 43. The weakening groove 43 on the first parallel conductor 41 is located on the movement path of the first piston 311, and the weakening groove 43 on the second parallel conductor 42 is located on the movement path of the second piston 312. Therefore, the first piston 311 and the second piston 312 can respectively impact and disconnect the first parallel conductor 41 and the second parallel conductor 42.

[0031] See Figure 5The narrow-slit arc-extinguishing chamber 5 has multiple arc-extinguishing narrow slits, each corresponding to a single parallel conductor. The metal mesh arc-extinguishing chamber 6 has multiple metal mesh groups, each corresponding to and connected to a single arc-extinguishing narrow slit, thus forming corresponding arc-extinguishing paths for the arcs generated when each parallel conductor is disconnected.

[0032] In this embodiment, the narrow-slit arc-extinguishing chamber 5 has a first arc-extinguishing narrow slit 51 and a second arc-extinguishing narrow slit 52, and the metal mesh arc-extinguishing chamber 6 is provided with a first metal mesh group 61 and a second metal mesh group 62. The first arc-extinguishing narrow slit 51 corresponds to the first parallel conductor 41, and the first metal mesh group 61 corresponds to and is connected to the first arc-extinguishing narrow slit 51; the second arc-extinguishing narrow slit 52 corresponds to the second parallel conductor 42, and the second metal mesh group 62 corresponds to and is connected to the second arc-extinguishing narrow slit 52.

[0033] When the circuit needs to be cut off, the synchronous trigger module 11 synchronously outputs trigger signals to the first igniter 201 and the second igniter 202, and the first igniter 201 and the second igniter 202 respectively generate high-pressure gas. The high-pressure gas flows into the pressure equalization chamber 22, and after pressure equalization in the pressure equalization chamber 22, it enters the piston receiving chambers where the first piston 311 and the second piston 312 are located through two parallel exhaust holes 33 respectively.

[0034] The high-pressure gas entering the two piston accommodating chambers pushes the first piston 311 and the second piston 312 toward the conductive copper busbar 4, respectively. The first piston 311 impacts the weakening groove 43 of the first parallel conductor 41, causing the first parallel conductor 41 to disconnect from that position; the second piston 312 impacts the weakening groove 43 of the second parallel conductor 42, causing the second parallel conductor 42 to disconnect from that position.

[0035] When the first parallel conductor 41 is disconnected, the electric arc enters the arc-extinguishing path of the first metal mesh group 61 through the first arc-extinguishing slit 51. When the second parallel conductor 42 is disconnected, the electric arc enters the arc-extinguishing path of the second metal mesh group 62 through the second arc-extinguishing slit 52. The arc is divided, cooled, and extinguished by the arc-extinguishing slits and the metal mesh group, thereby completing the disconnection of multiple parallel current-carrying paths.

[0036] This embodiment utilizes the sequential coordination of a synchronous triggering module 11, multiple igniters, a pressure equalization chamber 22, multiple parallel exhaust ports 33, multiple pistons, multiple parallel conductors, and a multi-path arc extinguishing structure to form a continuous working process of synchronous triggering, common gas collection, pressure equalization, branch drive, corresponding interruption, and corresponding arc extinguishing. This helps to reduce the disconnection time difference between multiple parallel conductors and reduces the possibility of current transfer to the parallel conductors that have not yet been disconnected after some parallel conductors have been disconnected, thereby improving the reliability of the circuit breaker's circuit breaking.

[0037] Example 2 See Figure 2 , Figure 3 and Figure 6 This embodiment further illustrates the specific structure of the ignition device and the synchronous triggering module 11 based on embodiment 1.

[0038] In this embodiment, taking a dual-channel structure as an example, the power chamber 2 is equipped with a first ignition device 201 and a second ignition device 202, the drive chamber 3 is equipped with a first piston 311 and a second piston 312, and the conductive copper busbar 4 includes a first parallel conductor 41 and a second parallel conductor 42. The first piston 311 and the first parallel conductor 41 form one corresponding relationship, and the second piston 312 and the second parallel conductor 42 form another corresponding relationship.

[0039] See Figure 3 The first igniter 201 and the second igniter 202 have the same internal structure. Each igniter includes an ignition powder 211, a bridge wire 212, an electrode plug 213, and two electrodes 214. The two electrodes 214 pass through and are fixed to the electrode plug 213. The two ends of the bridge wire 212 are electrically connected to the two electrodes 214 respectively, and the bridge wire 212 is disposed inside the ignition powder 211. The two electrodes 214 respectively form two electrical connection terminals of the igniter, allowing the bridge wire 212 to be connected to the ignition circuit formed by the synchronous triggering module 11 through the two electrodes 214.

[0040] Multiple ignition devices' bridge wires 212 are connected in parallel to the output terminal of the synchronous triggering module 11. When the synchronous triggering module 11 outputs the ignition current, the ignition current flows through multiple parallel branches and passes through the corresponding bridge wires 212, causing the multiple bridge wires 212 to ignite the corresponding ignition powder 211.

[0041] To reduce the resistance differences among different bridge wires 212, this embodiment uses a four-wire measurement method to measure the resistance of multiple bridge wires 212 separately, and matches multiple igniters based on the measurement results. The bridge wires 212 can be made of Ni80Cr20 nickel-chromium alloy wire, with a resistivity of 1.1×10^-6 Ω·m and a resistance value of 2Ω±0.3Ω. After matching, the resistance difference between any two bridge wires 212 is no greater than 0.1Ω. In embodiments with higher requirements for ignition consistency, igniters with a resistance difference between any two bridge wires 212 of no greater than 0.05Ω can be further selected.

[0042] See Figure 2 The synchronous trigger module 11 includes a signal input processing section, a capacitor energy storage pulse discharge unit, a high-current drive circuit, a switching switch, and a current sharing network. The signal input processing section includes an input interface, an isolation circuit, and a delay compensation circuit. The external trigger signal is input to the delay compensation circuit through the input interface and the isolation circuit. The delay compensation circuit compensates for the transmission delay of the trigger signal, and its fine-tuning accuracy can be no greater than 1μs.

[0043] The external trigger signal can be a voltage signal from 5V to 12V. The input interface and isolation circuit receive and electrically isolate the external trigger signal, and transmit the processed trigger signal to the delay compensation circuit. The delay compensation circuit outputs control signals to the capacitor energy storage pulse discharge unit or the high-current drive circuit according to the predetermined delay of each branch.

[0044] The capacitor energy storage pulse discharge unit and the high-current drive circuit are respectively connected to the switching switch, and the output of the switching switch is connected to the current sharing network. The switching switch allows selection of either the capacitor energy storage pulse discharge unit or the high-current drive circuit to supply power to the current sharing network based on the operating conditions of the circuit breaker. The current sharing network includes multiple parallel branches connected one-to-one with multiple bridge wires 212, each parallel branch transmitting a burst current to its corresponding bridge wire 212.

[0045] The high-current drive circuit can be constructed by connecting at least two metal-oxide-semiconductor field-effect transistors (MOSFETs) in parallel, and its peak output capability can be no less than 50A. The high-current drive circuit is turned on according to the control signal output by the delay compensation circuit, and outputs burst current to multiple bridge wires 212 through the current sharing network.

[0046] See Figure 6 The capacitor energy storage pulse discharge unit includes a DC-DC boost module, an energy storage capacitor, and high-power switching devices. The input of the DC-DC boost module is connected to an external DC power supply, and the output is connected to a common energy storage capacitor to boost the voltage provided by the external DC power supply to the charging voltage of the common energy storage capacitor.

[0047] In one embodiment, the output voltage of the external DC power supply is 12V, and the DC-DC boost module boosts this voltage to 50V to 200V and charges the energy storage capacitor. The rated voltage of the energy storage capacitor can be 50V to 200V, and the capacitance can be 100μF to 1000μF.

[0048] The energy storage capacitor is connected to the current sharing network via a high-power switching device. The high-power switching device can be a silicon controlled rectifier (SCR) or an insulated gate bipolar transistor (IGBT). A trigger control circuit is connected to the control terminal of the high-power switching device. When the trigger control circuit receives a trigger signal from the synchronous trigger module 11, the high-power switching device turns on within a turn-on response time of no more than 500 ns, allowing the shared energy storage capacitor to discharge to the current sharing network through the high-power switching device.

[0049] The input of the current sharing network is connected to the output of the high-power switching device, and the multiple parallel branches of the current sharing network are connected to multiple bridge wires 212. The current sharing network distributes the pulse discharge current output of the common energy storage capacitor, ensuring that the difference in discharge current between different parallel branches is no greater than 5%. No additional voltage divider components are set in the discharge circuit of the common energy storage capacitor, the inductance of the discharge circuit can be no greater than 1μH, and the rise time of the pulse discharge current can be no greater than 100ns.

[0050] In one specific configuration, the energy storage capacitor is an electrolytic capacitor with a capacitance of 470μF and a rated voltage of 200V, and its charging voltage is 150V; the high-power switching device is a thyristor rectifier of model SKKT 57 / 16E, with a turn-on response time of no more than 400ns; the inductance of the discharge circuit is 0.8μH. With this configuration, the current sharing network ensures that the current difference between the two discharge branches is no more than 5%.

[0051] The ignition process of bridge wire 212 involves Joule heating and heat accumulation ignition. When energized, bridge wire 212 generates Joule heat. When the temperature of bridge wire 212 reaches the ignition temperature of the propellant 211, the corresponding igniter completes the ignition.

[0052] In the formula, This indicates the heating power of bridge wire 212. This indicates the current flowing through bridge wire 212. This indicates the resistance of bridge wire 212.

[0053] For the resistances are respectively and The two bridge wires 212 have a resistance difference of 1 / 2. Under the same current I, the difference in heating power between the two bridge wires 212 satisfies:

[0054] In the formula, This indicates the difference in heating power between the two bridge wires 212. This indicates the resistance difference between the two bridge wires 212. By measuring and matching the bridge wires 212 using a four-wire system, the resistance can be reduced. By outputting large current pulses to multiple bridge wires 212, the time required for the bridge wires 212 to heat up to the ignition temperature of the ignition charge 211 can be shortened, thereby reducing the impact of differences in bridge wire resistance, heat dissipation conditions and ignition charge state on the ignition time.

[0055] Under normal mass production conditions, the resistance difference between any two bridge wires 212 can be controlled to be no greater than 0.1Ω, ensuring that the ignition and detonation time difference between multiple igniters is no greater than 10μs. Under high-precision conditions, igniters with a resistance difference between any two bridge wires 212 of no greater than 0.05Ω can be used, combined with low-inductance wiring and delay compensation, ensuring that the initial detonation time difference between multiple igniters is no greater than 3μs. Under the capacitor energy storage pulse discharge condition of dual igniters, the initial detonation time difference between the first igniter 201 and the second igniter 202 can be no greater than 2μs.

[0056] This embodiment reduces the ignition and detonation time difference between multiple igniters by using at least one of the following methods: bridge wire resistance matching, current sharing network, high current drive, and capacitor energy storage pulse discharge. This provides a more consistent input condition for the pressure equalization chamber 22 to perform subsequent pressure equalization on the high-pressure gas generated by the multiple igniters.

[0057] Example 3 See Figure 1 , Figure 4 and Figure 7 This embodiment, based on embodiment 1, further illustrates the pressure equalization chamber 22, the piston drive structure, and the breaking structure of the conductive copper busbar 4.

[0058] The pressure equalization chamber 22 is located between the gas output side of multiple igniters and the piston accommodating chambers where multiple pistons are located. The high-pressure gas generated by the multiple igniters first enters the pressure equalization chamber 22, and then is delivered from the pressure equalization chamber 22 to the corresponding piston accommodating chambers through multiple parallel exhaust holes 33.

[0059] The volume of the pressure equalization chamber 22 is at least twice the volume of the gas generation chamber of a single igniter, providing space for the high-pressure gases generated by multiple igniters to converge, buffer, and mix after entering the pressure equalization chamber 22. The pressure equalization chamber 22 does not contain synchronizing covers, baffles, or other moving mechanical parts for mechanically limiting or synchronizing multiple pistons; the consistency of action among the multiple pistons is mainly achieved through the mixing and pressure equalization of the high-pressure gases within the pressure equalization chamber 22.

[0060] See Figure 7Multiple guide ribs 23 are provided inside the pressure equalization chamber 22, and the multiple guide ribs 23 are distributed at intervals along the circumference of the pressure equalization chamber 22. After the high-pressure gas enters the pressure equalization chamber 22, it is guided by the multiple guide ribs 23, forming mutually converging airflows in the pressure equalization chamber 22 to promote the mixing of high-pressure gases generated by different igniters.

[0061] In one embodiment, the angle between the flow-guiding ribs 23 and the inner wall of the pressure equalization cavity 22 is 45°, and the number of flow-guiding ribs 23 is 4 to 6, evenly distributed along the circumference of the pressure equalization cavity 22. Figure 7 In the dual-ignition device structure shown, six flow-guiding fins 23 can be provided. The flow-guiding fins 23 can also be replaced by turbulence columns, spiral grooves, or other structures that can change the airflow direction and promote gas mixing. The inner surface of the pressure equalization chamber 22 can also be formed with a rough texture, and its profile arithmetic mean deviation Ra can be 3.2μm to 6.3μm, to further promote high-pressure gas mixing.

[0062] Multiple parallel exhaust holes 33 are disposed on the side of the pressure equalization chamber 22 facing the drive chamber 3, and each corresponds to one of the multiple piston accommodating chambers. The multiple parallel exhaust holes 33 have the same diameter, with a diameter tolerance not exceeding 0.02 mm, an axial parallelism tolerance not exceeding 0.01 mm, and an arithmetic mean deviation Ra of the inner wall profile not exceeding 1.6 μm. By controlling the diameter, axial direction, and inner wall surface condition of the multiple parallel exhaust holes 33, the flow resistance difference between different exhaust paths can be reduced.

[0063] In a typical mass-production configuration, the power chamber 2 houses a first igniter 201 and a second igniter 202. The volume of the pressure equalization chamber 22 is three times the volume of the gas-generating chamber of a single igniter. Six guide ribs 23 are installed within the pressure equalization chamber 22, with each guide rib 23 forming a 45° angle with the inner wall of the pressure equalization chamber 22. The pressure equalization chamber 22 is connected to the piston housing chamber containing the first piston 311 and the second piston 312 via two parallel exhaust ports 33 with a diameter of 8 mm, respectively. The diameter tolerance of the parallel exhaust ports 33 is no greater than 0.02 mm, and the parallelism tolerance of their axes is 0.008 mm.

[0064] The high-pressure gas generated by the first igniter 201 and the second igniter 202 can have a pressure of 40MPa to 50MPa. The high-pressure gas first enters the pressure equalization chamber 22 together, where it is mixed and pressure equalized under the action of multiple guide fins 23, and then enters the piston accommodating chambers of the first piston 311 and the second piston 312 through two parallel exhaust holes 33 respectively. Under the specific operating condition of 45MPa, the gas equalization time in the pressure equalization chamber 22 can be no greater than 0.01ms, and the pressure difference between different output positions after equalization can be no greater than 1%.

[0065] A piston sealing ring 32 is provided between the outer peripheral wall of each piston and the inner wall of the corresponding piston receiving cavity. The piston sealing ring 32 is installed in the piston receiving cavity along with the corresponding piston and seals against the inner wall of the piston receiving cavity to reduce the leakage of high-pressure gas from the gap between the outer peripheral wall of the piston and the inner wall of the piston receiving cavity. As a result, the high-pressure gas can act on the first piston 311 and the second piston 312 respectively, and push the first piston 311 and the second piston 312 toward the conductive copper busbar 4.

[0066] Under normal mass production conditions, the two parallel exhaust ports 33 can be configured with a diameter tolerance of no more than 0.02 mm, an axis parallelism tolerance of no more than 0.01 mm, and an arithmetic mean deviation Ra of the inner wall profile of no more than 1.6 μm, so that the piston drive time difference between the first piston 311 and the second piston 312 is no more than 0.03 ms. Under high-precision conditions, the diameter tolerance of the parallel exhaust ports 33 can be no more than 0.01 mm, the axis parallelism tolerance can be no more than 0.005 mm, and the arithmetic mean deviation Ra of the inner wall profile of no more than 0.8 μm, so that the piston drive time difference between the first piston 311 and the second piston 312 is no more than 0.02 ms.

[0067] See Figure 4 (a) and Figure 4 In (b), the conductive copper busbar 4 includes a first parallel conductor 41 and a second parallel conductor 42. The first parallel conductor 41 and the second parallel conductor 42 extend along the current-carrying direction of the conductive copper busbar 4 and together carry the main circuit current.

[0068] Weakening grooves 43 are provided on both the first parallel conductor 41 and the second parallel conductor 42. For each parallel conductor, two weakening grooves 43 are respectively formed on two opposite surfaces of the parallel conductor along the thickness direction and are arranged opposite each other. The two oppositely arranged weakening grooves 43 together reduce the effective cross-sectional area of ​​the corresponding parallel conductor at that position, forming a predetermined break portion.

[0069] The first piston 311 is disposed toward the predetermined breaking portion defined by the two weakening grooves 43 of the first parallel conductor 41, and the second piston 312 is disposed toward the predetermined breaking portion defined by the two weakening grooves 43 of the second parallel conductor 42. The impact directions of the first piston 311 and the second piston 312 pass through the predetermined breaking portions of the corresponding parallel conductors.

[0070] exist Figure 4In the illustrated embodiment, the weakening groove 43 can be a V-shaped groove. Two V-shaped grooves disposed on opposite surfaces of the same parallel conductor correspond to each other along the thickness direction of the parallel conductor. The weakening grooves 43 on the first parallel conductor 41 and the second parallel conductor 42 have the same depth and groove angle, and the depth consistency tolerance of each weakening groove 43 can be no greater than 0.05 mm, so as to reduce the difference in breaking force between the first parallel conductor 41 and the second parallel conductor 42.

[0071] When the high-pressure gas, after pressure equalization, enters the piston accommodating chambers of the first piston 311 and the second piston 312 respectively, the high-pressure gas pushes the first piston 311 and the second piston 312 toward the conductive copper busbar 4. The first piston 311 impacts the predetermined breaking point of the first parallel conductor 41, causing the first parallel conductor 41 to break between the two weakening grooves 43; the second piston 312 impacts the predetermined breaking point of the second parallel conductor 42, causing the second parallel conductor 42 to break between the two weakening grooves 43.

[0072] Under normal mass production conditions, the overall piston impact time difference between the first piston 311 and the second piston 312 can be no greater than 15μs. When using an igniter with a resistance difference between any two bridge wires 212 not greater than 0.05Ω and a capacitor-stored pulse discharge, and controlling the aperture tolerance, axis parallelism tolerance, and arithmetic mean deviation Ra of the parallel exhaust port 33 to be no greater than 0.01mm, 0.005mm, and 0.8μm, respectively, the overall piston impact time difference between the first piston 311 and the second piston 312 can be no greater than 8μs.

[0073] This application is not limited to dual igniters, dual pistons, and dual parallel conductor structures. In a three-channel embodiment, three igniters, three pistons, three parallel exhaust ports 33, and three parallel conductors can be provided. The volume of the pressure equalization chamber 22 can be four times the volume of the gas generation chamber of a single igniter, and six guide ribs 23 arranged circumferentially at a 45° angle to its inner wall can be provided inside the pressure equalization chamber 22. The cross-sectional area of ​​each of the three parallel conductors of the conductive copper busbar 4 can be 50 mm² ± 2 mm².

[0074] In a four-channel embodiment, four igniters, four pistons, four parallel exhaust ports 33, and four parallel conductors can be provided. The volume of the pressure equalization chamber 22 can be five times the volume of the gas generation chamber of a single igniter, and six guide ribs 23 arranged circumferentially at a 45° angle to its inner wall can be provided inside the pressure equalization chamber 22. The cross-sectional area of ​​the four parallel conductors of the conductive copper busbar 4 can each be 35mm² ± 2mm².

[0075] As the number of igniters, pistons, and parallel conductors increases, the number of parallel exhaust holes 33, arc-extinguishing slits, and metal mesh groups increases accordingly, while maintaining the one-to-one correspondence between each piston and each parallel conductor, each parallel conductor and each arc-extinguishing slit, and each arc-extinguishing slit and each metal mesh group.

[0076] In this embodiment, the high-pressure gas generated by multiple igniters is concentrated and balanced by the pressure equalization chamber 22, and then the balanced high-pressure gas is delivered to multiple piston accommodating chambers by multiple parallel exhaust holes 33. At the same time, gas leakage is reduced by the piston sealing ring 32, and the predetermined break-off point of each parallel conductor is determined by two oppositely arranged weakening grooves 43, thereby forming a continuous structural cooperation relationship from gas equalization, branch drive to corresponding break-off.

[0077] Example 4 See Figure 1 , Figure 4 and Figure 5 This embodiment, based on embodiment 1, further illustrates the two-stage arc-extinguishing structure consisting of the narrow slit arc-extinguishing chamber 5 and the metal mesh arc-extinguishing chamber 6.

[0078] A narrow-slit arc-extinguishing chamber 5 is disposed between the conductive copper busbar 4 and the metal mesh arc-extinguishing chamber 6, forming multiple arc-extinguishing narrow slits corresponding one-to-one with multiple parallel conductors. Taking a dual-channel structure as an example, the narrow-slit arc-extinguishing chamber 5 forms a first arc-extinguishing narrow slit 51 and a second arc-extinguishing narrow slit 52.

[0079] The first arc-extinguishing slit 51 corresponds to the first parallel conductor 41, and the second arc-extinguishing slit 52 corresponds to the second parallel conductor 42. The arc generated when the first parallel conductor 41 is disconnected can enter the first arc-extinguishing slit 51, and the arc generated when the second parallel conductor 42 is disconnected can enter the second arc-extinguishing slit 52.

[0080] The width of both the first arc-extinguishing slit 51 and the second arc-extinguishing slit 52 can be 2mm to 3mm, and the length can be 35mm to 40mm. After the electric arc enters the corresponding arc-extinguishing slit, it is compressed and cooled by the arc-extinguishing slit, causing the arc energy to attenuate.

[0081] The metal mesh arc-extinguishing chamber 6 is located on the side of the narrow-slit arc-extinguishing chamber 5 away from the conductive copper busbar 4, and is equipped with multiple metal mesh groups corresponding one-to-one with the multiple arc-extinguishing narrow slits. Figure 5 In the dual-channel structure shown, a first metal mesh group 61 and a second metal mesh group 62 are provided inside the metal mesh arc-extinguishing chamber 6. The first arc-extinguishing slit 51 is connected to the first metal mesh group 61, and the second arc-extinguishing slit 52 is connected to the second metal mesh group 62.

[0082] The first metal mesh group 61 and the second metal mesh group 62 each include two metal meshes spaced apart along the front-back direction of the metal mesh arc-extinguishing chamber 6. Four metal mesh receiving cavities are correspondingly formed within the metal mesh arc-extinguishing chamber 6, and the four metal meshes are respectively disposed within the four metal mesh receiving cavities.

[0083] Each metal mesh consists of 3 to 5 layers of stainless steel mesh stacked together. The stainless steel mesh can be made of 316L stainless steel, with a mesh size of 1mm × 1mm and a wire diameter of 0.25mm. The electric arc entering the metal mesh assembly passes through multiple layers of stainless steel mesh in sequence, where the layers of stainless steel mesh divide and cool the arc until it is extinguished.

[0084] When the first piston 311 breaks the first parallel conductor 41, the electric arc generated at the broken part of the first parallel conductor 41 first enters the first arc-extinguishing slit 51, and after being compressed and cooled by the first arc-extinguishing slit 51, it enters the first metal mesh group 61, and is further divided and cooled by multiple stainless steel mesh bodies in the first metal mesh group 61.

[0085] When the second piston 312 breaks the second parallel conductor 42, the electric arc generated at the broken part of the second parallel conductor 42 first enters the second arc-extinguishing slit 52, and after being compressed and cooled by the second arc-extinguishing slit 52, it enters the second metal mesh group 62, and is further divided and cooled by multiple stainless steel mesh bodies in the second metal mesh group 62.

[0086] Thus, the first parallel conductor 41 and the second parallel conductor 42 each have independent and one-to-one corresponding arc-extinguishing paths. When the first parallel conductor 41 is disconnected, the arc generated moves along the arc-extinguishing path formed by the first arc-extinguishing slit 51 and the first metal mesh group 61. When the second parallel conductor 42 is disconnected, the arc generated moves along the arc-extinguishing path formed by the second arc-extinguishing slit 52 and the second metal mesh group 62, thereby processing the arcs interrupted by different parallel conductors respectively.

[0087] Under a test condition with a breaking current of 16kA, the current distribution error between the first parallel conductor 41 and the second parallel conductor 42 is no greater than 5%. After the two parallel conductors break, the arc generated at their break points enters the corresponding arc extinguishing paths. When using arc extinguishing slits with a width of 2mm to 3mm and a length of 35mm to 40mm, and each metal mesh includes 3 to 5 layers of 316L stainless steel mesh, the total arc extinguishing time under conventional mass production conditions is no greater than 2.0ms, and the total arc extinguishing time under high-precision conditions is no greater than 1.6ms. The insulation resistance of the break after arc extinguishing is no less than 150MΩ.

[0088] This application is not limited to a dual-channel arc-extinguishing structure. When the number of igniters, pistons, and parallel conductors is three, four, or more, the number of arc-extinguishing slits and metal mesh groups increases accordingly, while maintaining a one-to-one correspondence between each parallel conductor and each arc-extinguishing slit, and between each arc-extinguishing slit and each metal mesh group.

[0089] In this embodiment, the electric arc is compressed and cooled by multiple arc-extinguishing slits corresponding to multiple parallel conductors, and the electric arc is further divided and cooled by multiple metal mesh groups connected to the multiple arc-extinguishing slits, thereby forming a two-stage arc-extinguishing path that corresponds one-to-one with multiple parallel conductors.

[0090] Example 5 See Figures 1 to 7 This embodiment provides a control method for a multi-point ignition device pyrotechnic switch, which can be executed by the multi-point ignition device pyrotechnic switch described in Embodiments 1 to 4.

[0091] When the circuit breaker is in its normal conducting state, the first parallel conductor 41 and the second parallel conductor 42 jointly carry the main circuit current. The first piston 311 is positioned towards the breaking portion of the first parallel conductor 41, and the second piston 312 is positioned towards the breaking portion of the second parallel conductor 42. The first piston 311, the first parallel conductor 41, the first arc-extinguishing slit 51, and the first metal mesh assembly 61 constitute the first breaking and arc-extinguishing path; the second piston 312, the second parallel conductor 42, the second arc-extinguishing slit 52, and the second metal mesh assembly 62 constitute the second breaking and arc-extinguishing path.

[0092] When the main circuit needs to be cut off, the synchronous trigger module 11 receives an external trigger signal and outputs an ignition current to the first igniter 201 and the second igniter 202 according to the external trigger signal. The bridge wires 212 in the first igniter 201 and the second igniter 202 heat up under the action of the ignition current and ignite the corresponding ignition powder 211, so that the first igniter 201 and the second igniter 202 generate high-pressure gas.

[0093] In one control method, the synchronous triggering module 11 outputs the ignition current to the current sharing network through the high current driving circuit, and the current sharing network distributes the ignition current to the bridge wires 212 of the first igniter 201 and the second igniter 202.

[0094] In another control method, the DC-DC boost module pre-charges the energy storage capacitor. After receiving an external trigger signal, the synchronous trigger module 11 controls the high-power switching device to turn on, causing the energy storage capacitor to pulsely discharge to the current sharing network through the high-power switching device. The current sharing network then transmits the ignition current to the bridge wires 212 of the first igniter 201 and the second igniter 202, respectively. The turn-on response time of the high-power switching device is no more than 500 ns.

[0095] The high-pressure gas generated by the first igniter 201 and the second igniter 202 does not directly enter the piston accommodating chamber where the first piston 311 and the second piston 312 are located. Instead, it first enters the pressure equalization chamber 22 together. Under the guidance of multiple guide fins 23, the high-pressure gas entering the pressure equalization chamber 22 converges and mixes with each other, so that the gas pressure at different positions tends to be equalized.

[0096] After pressure equalization, the high-pressure gas is output through multiple parallel exhaust ports 33. Among them, a portion of the high-pressure gas enters the piston cavity where the first piston 311 is located through the parallel exhaust port 33 corresponding to the first piston 311, and another portion of the high-pressure gas enters the piston cavity where the second piston 312 is located through the parallel exhaust port 33 corresponding to the second piston 312.

[0097] High-pressure gas entering the two piston accommodating chambers acts on the first piston 311 and the second piston 312, respectively. The first piston 311 and the second piston 312 move towards the conductive copper busbar 4 under the pressure of the high-pressure gas. Piston sealing rings 32 seal the outer peripheral wall of the corresponding piston with the inner wall of the piston accommodating chamber to reduce high-pressure gas leakage.

[0098] The first piston 311 impacts the break-off portion on the first parallel conductor 41, defined by two opposing weakening grooves 43, causing the first parallel conductor 41 to break between the two weakening grooves 43. The second piston 312 impacts the break-off portion on the second parallel conductor 42, defined by two opposing weakening grooves 43, causing the second parallel conductor 42 to break between the two weakening grooves 43, thereby cutting off multiple parallel current-carrying paths of the conductive copper busbar 4.

[0099] When the first parallel conductor 41 is disconnected, the electric arc generated enters the corresponding first arc-extinguishing slit 51, and when the second parallel conductor 42 is disconnected, the electric arc generated enters the corresponding second arc-extinguishing slit 52. The first arc-extinguishing slit 51 and the second arc-extinguishing slit 52 respectively compress and cool the electric arcs that enter them.

[0100] The electric arc, after being processed by the first arc-extinguishing slit 51, enters the first metal mesh group 61, where it is divided and cooled by multiple stainless steel mesh bodies. The electric arc, after being processed by the second arc-extinguishing slit 52, enters the second metal mesh group 62, where it is divided and cooled by multiple stainless steel mesh bodies until the electric arcs generated at different breaking points are extinguished.

[0101] Thus, this embodiment sequentially completes the synchronous triggering of multiple igniters, the centralized convergence and pressure equalization of high-pressure gases generated by multiple igniters, the branch output of the equalized high-pressure gases, the corresponding driving of multiple pistons, the corresponding breaking of multiple parallel conductors, and the corresponding arc extinguishing of multiple breaking points.

[0102] To verify the synchronous power-off performance of the above control method, control group, experimental group 1, experimental group 2, and experimental group 3 were set up respectively. The control group used a purely electronic synchronization method; experimental group 1 used a general mass-produced configuration; experimental group 2 used carefully selected components and precision-machined configuration; and experimental group 3 used an ultra-high precision configuration combining mechanical voltage equalization and capacitor energy storage pulse discharge. The synchronous power-off performance under different configurations was verified through fluid simulation, circuit simulation, and physical prototype testing. The test results are shown in Table 1.

[0103] Table 1. Test results of synchronous power-off performance under different configurations

[0104] In Table 1, the ignition and detonation time difference represents the time difference between multiple igniters receiving a common trigger signal and completing their respective ignitions; the piston drive time difference represents the time difference between multiple pistons starting to move under the drive of high-pressure gas; and the whole machine piston impact time difference represents the time difference between multiple pistons reaching their corresponding parallel conductors and implementing impact.

[0105] In Experiment 1, the ignition-detonation time difference was no greater than 10 μs, the piston drive time difference was no greater than 30 μs, and the overall piston impact time difference was no greater than 15 μs; in Experiment 2, the ignition-detonation time difference was no greater than 3 μs, the piston drive time difference was no greater than 20 μs, and the overall piston impact time difference was no greater than 8 μs; in Experiment 3, the ignition-detonation time difference was no greater than 2 μs, the piston drive time difference was no greater than 20 μs, and the overall piston impact time difference was no greater than 8 μs.

[0106] Compared with the control group, experimental groups 1 to 3 all maintained stable operation without abnormalities under electromagnetic interference, and the current distribution error was no greater than 5%. The total arc extinguishing time of experimental group 1 was no greater than 2.0 ms, and the total arc extinguishing time of experimental groups 2 and 3 was no greater than 1.6 ms. The break insulation resistance of experimental groups 1 to 3 was no less than 150 MΩ.

[0107] The gas equalization time in the pressure equalization chamber 22 is no greater than 0.01 ms. This data represents the fluid characteristics of the pressure equalization chamber 22, and its fluid simulation results are consistent with the actual test results. After the high-pressure gases generated by multiple igniters converge and achieve pressure equalization in the pressure equalization chamber 22, they drive the corresponding pistons through multiple parallel exhaust ports 33, ensuring that the piston impact time difference of the entire machine in experimental groups 1 to 3 is no greater than 15 μs, 8 μs, and 8 μs, respectively.

[0108] In embodiments where the number of multiple igniters, multiple pistons, and multiple parallel conductors is three, four, or more, the synchronous triggering module 11 outputs ignition current to multiple igniters together; the high-pressure gas generated by multiple igniters enters the pressure equalization chamber 22 together, and after pressure equalization, drives multiple pistons through multiple parallel exhaust holes 33 respectively; the multiple pistons break the corresponding parallel conductors respectively; the electric arc generated by the multiple breaking points enters the corresponding arc extinguishing slits and metal mesh groups respectively, thereby completing the cutting off and arc extinguishing of multiple parallel current-carrying paths.

[0109] Although the multiple igniters in this embodiment are jointly triggered by the synchronous triggering module 11, the consistency of the breaking of the multiple parallel conductors does not depend solely on the ignition and detonation time difference between the multiple igniters. After the high-pressure gas generated by the multiple igniters converges and equalizes in the pressure equalization chamber 22, it pushes the corresponding pistons through multiple parallel exhaust holes 33, so that synchronous triggering, pressure equalization, branch drive and corresponding breaking form a continuous control process.

[0110] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0111] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0112] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0113] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.

[0114] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0115] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A multi-point ignition device pyrotechnic type circuit breaker, characterized in that, It includes the top cover (1), power chamber (2), drive chamber (3), conductive copper busbar (4), narrow slot arc-extinguishing chamber (5) and metal mesh arc-extinguishing chamber (6) assembled in sequence. The upper cover (1) is provided with a synchronous triggering module (11), the power chamber (2) is provided with a pressure equalization chamber (22) and multiple igniters, the gas output side of the multiple igniters is connected to the pressure equalization chamber (22), the synchronous triggering module (11) is electrically connected to the multiple igniters respectively, and synchronously outputs triggering signals to the multiple igniters; The drive chamber (3) is provided with multiple piston accommodating chambers, and a piston is movably provided in each piston accommodating chamber. The pressure equalization chamber (22) is connected to multiple piston accommodating chambers through multiple parallel exhaust holes (33). The conductive copper busbar (4) includes multiple parallel conductors, each of which corresponds to one of the multiple pistons. Each of the parallel conductors is provided with a weakening groove (43) located on the corresponding piston movement path. The narrow-slit arc-extinguishing chamber (5) has multiple arc-extinguishing narrow slits, and each of the multiple arc-extinguishing narrow slits corresponds to one of the multiple parallel conductors; the metal mesh arc-extinguishing chamber (6) is provided with multiple metal mesh groups, and each of the multiple metal mesh groups corresponds to one of the multiple arc-extinguishing narrow slits and is connected to them.

2. The multi-point ignition device pyrotechnic circuit breaker according to claim 1, characterized in that, Each of the ignition devices includes an ignition charge (211), a bridge wire (212), an electrode plug (213), and two electrodes (214). The two electrodes (214) are spaced apart from the electrode plug (213). The bridge wire (212) is disposed inside the ignition charge (211), and both ends of the bridge wire (212) are connected to the two electrodes (214) respectively. Multiple bridge wires (212) are connected in parallel to the output end of the synchronous triggering module (11).

3. The multi-point ignition device pyrotechnic type circuit breaker according to claim 2, characterized in that, The synchronous triggering module (11) includes a triggering control circuit, a capacitor energy storage pulse discharge unit, and a current sharing network. The capacitor energy storage pulse discharge unit includes a boost module, an energy storage capacitor, and a high-power switching device. The boost module is connected to the energy storage capacitor. The energy storage capacitor is connected to the current sharing network through the high-power switching device. The triggering control circuit is connected to the control terminal of the high-power switching device. The current sharing network includes multiple parallel branches that are respectively connected to multiple bridge wires (212).

4. The multi-point ignition device pyrotechnic type circuit breaker according to claim 2, characterized in that, The difference in resistance between any two of the bridge wires (212) is no greater than 0.1Ω.

5. The multi-point ignition device pyrotechnic type circuit breaker according to claim 1, characterized in that, The pressure equalization chamber (22) is provided with a plurality of flow guide ribs (23), which are located between the gas output side of the plurality of igniters and the plurality of parallel exhaust holes (33) and are distributed at intervals along the circumference of the pressure equalization chamber (22); the plurality of parallel exhaust holes (33) are located on the side of the pressure equalization chamber (22) facing the drive chamber (3).

6. The multi-point ignition device pyrotechnic type circuit breaker according to claim 1, characterized in that, A piston sealing ring (32) is provided between the outer peripheral wall of each piston and the inner wall of the corresponding piston receiving cavity.

7. The multi-point ignition device pyrotechnic type circuit breaker according to claim 1, characterized in that, Each of the parallel conductors is provided with a weakening groove (43) on its opposite sides. The two weakening grooves (43) are arranged opposite each other, and the areas where the two weakening grooves (43) are located together constitute the breaking part located on the corresponding piston movement path.

8. The multi-point ignition device pyrotechnic type circuit breaker according to claim 1, characterized in that, Each of the metal mesh groups comprises two metal meshes spaced apart.

9. The multi-point ignition device pyrotechnic type circuit breaker according to claim 8, characterized in that, Each of the metal meshes comprises multiple layers of stacked stainless steel mesh.

10. A method for controlling a multi-point ignition device pyrotechnic type circuit breaker, characterized in that, For controlling the multi-point ignition device pyrotechnic circuit breaker as described in any one of claims 1-9, comprising: The synchronous triggering module (11) is controlled to output trigger signals to multiple igniters synchronously, so that the high-pressure gas generated by the multiple igniters flows into the pressure equalization chamber (22). The high-pressure gas is pressure balanced in the pressure equalization chamber (22) and enters the piston accommodating chamber through the parallel exhaust holes (33) to drive the pistons respectively. The pistons are made to impact the corresponding parallel conductors along their movement paths, so that the parallel conductors are broken at the locations of the corresponding weakening grooves (43); The arc generated when the multiple parallel conductors are disconnected is extinguished by the narrow slit arc-extinguishing chamber (5) and the metal mesh arc-extinguishing chamber (6).

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