Anti-vibration magnetic trigger device and excitation fuse

Abstract

The utility model relates to the field of circuit protection, in particular to an anti-vibration magnetic trigger device and an excitation fuse, which comprise a conductor which can be connected in series into a main circuit, at least two groups of magnetic trigger structures which are arranged around the conductor at intervals, and a self-excitation trigger loop, normally-open switch structures which are in one-to-one correspondence and linkage with the magnetic trigger structures are connected in series in the self-excitation trigger loop; the moving magnetizer structures of each group of magnetic trigger structures are different in displacement direction, and a counterforce device is arranged between the moving magnetizer structures of at least two groups of magnetic trigger structures. When applied in an excitation fuse, a self-excitation trigger signal may be provided to the excitation fuse. According to the invention, through more than two groups of magnetic trigger structures and counter-force devices, conduction of a self-excitation trigger loop caused by misoperation of the magnetic trigger devices during vibration is prevented, and the working reliability is improved.

Description

Technical Field

[0001] This invention relates to the field of circuit protection, specifically to an excitation fuse structure that integrates a magnetic triggering device capable of providing passive protection. Background Technology

[0002] Existing vehicle-mounted excitation fuses primarily provide active protection. When the Business Management System (BMS) detects a short circuit in the main circuit, it sends a signal to the excitation fuse trigger, disconnecting the main circuit. Another type of passive excitation fuse can achieve integrated active and passive protection. Its principle involves connecting a signal fuse in series with the main circuit. When a short circuit occurs, the signal fuse melts, transmitting a voltage signal across its terminals to the excitation source, thus disconnecting the main circuit. Because passive excitation fuses connect the signal fuse in series with the main circuit, their performance in normal current carrying capacity, resistance to current surges, and resistance to vibration shocks is relatively poor. They also have a higher passive protection lower limit, longer operating time, and poorer temperature rise. To address the shortcomings of existing excitation fuses, a magnetic triggering device was developed that integrates into the fuse circuit. Changes in the circuit current cause a change in the magnetic field of the magnetic triggering device, thereby triggering its operation. This controls the closure of the self-excitation triggering circuit, which provides a self-excitation trigger signal to the excitation source of the fuse. Referring to Chinese Patent 2023224589991, an excitation fuse with integrated active and passive protection functions uses a magnetic triggering device to control the closure of the self-excitation triggering circuit, providing a passive trigger signal to the excitation source. While this solves the problems of excitation fuses without a magnetic triggering device, certain drawbacks remain. When the magnetic triggering device activates, the moving magnet shifts towards the stationary magnet, causing a pull-in action. Under normal operating and storage conditions, one end of the moving magnet is suspended. When the product is subjected to strong vibrations, the moving magnet may vibrate. If the amplitude is large, the moving magnet may shift towards the stationary magnet, potentially closing the self-excitation triggering circuit, thus triggering a malfunction of the excitation source and rendering the excitation fuse unusable. Summary of the Invention

[0003] The purpose of this invention is to provide an anti-vibration magnetic triggering device and an excitation fuse structure, which can prevent the magnetic triggering device from malfunctioning, avoid the closure of the self-excitation triggering circuit, and thus prevent the excitation fuse using the magnetic triggering device from malfunctioning, thereby improving the safety performance of the product.

[0004] To achieve the above objectives, the present invention provides a vibration-resistant magnetic triggering device, comprising a conductor that can be connected in series into a main circuit, at least two sets of magnetic triggering structures spaced apart around the conductor, and a self-excited triggering circuit, wherein the magnetic triggering structures are located in the magnetic field formed when the conductor is energized;

[0005] The self-excited triggering circuit is connected in series with a switch structure that corresponds one-to-one with each group of magnetic triggering structures, and the switch structure is normally open.

[0006] Each set of magnetic triggering structures includes a stationary magnet and a moving magnet structure, with a movement air gap maintained between the stationary and moving magnet structures. The moving magnet structure is linked to its corresponding switch structure. When the moving magnet structure of each set of magnetic triggering structures moves toward the stationary magnet, the displacement direction of the moving magnet structure is different. At least two sets of magnetic triggering structures have a reaction force device between their moving magnet structures.

[0007] When the moving magnetic structure is subjected to vibration, and the reaction force of the reaction device is greater than the impact force generated by the vibration that causes the moving magnetic structure of the magnetic triggering structure to displace toward the stationary magnetic structure, when one group of moving magnetic structures displaces toward the corresponding stationary magnetic structure, the reaction device acts on the other group of moving magnetic structures, so that the moving magnetic structure remains stationary or moves away from the corresponding stationary magnetic structure, and the self-excited triggering circuit is always in the open state.

[0008] When the current in the conductor exceeds a set threshold, the magnetic attraction force generated by the stationary magnet on the moving magnet structure is greater than the reaction force of the reaction device. The moving magnet structure is displaced and attracted in the direction of the corresponding stationary magnet. The switch structure linked with the moving magnet structure closes. When all magnetic triggering devices are activated to close the corresponding switch structure, the self-excited triggering circuit is turned on.

[0009] Preferably, the moving magnetic structure is disposed on opposite sides or adjacent sides of the conductor current direction.

[0010] Preferably, the stationary magnet is U-shaped or C-shaped and is arranged around the conductor, with the conductor passing through the groove of the U-shaped or C-shaped stationary magnet; the moving magnet structure is arranged at the open end of the stationary magnet, and a moving air gap is maintained between the moving magnet structure and the open end of the stationary magnet.

[0011] Preferably, when the moving magnetic structures are located on opposite sides of the conductor, the reaction device is a reaction spring, and the moving magnetic structures are connected to each other by reaction springs.

[0012] Preferably, the moving magnetic conductor structure includes an insulating actuating element and a moving magnetic conductor, the moving magnetic conductor being disposed on the side of the insulating actuating element facing the stationary magnetic conductor and directly opposite the stationary magnetic conductor, and the reaction device being disposed between the insulating actuating elements of the moving magnetic conductor structure.

[0013] Preferably, one end of the insulating actuating member is hinged to one side of the stationary magnet, and the other end is suspended across the stationary magnet and supported by a support spring.

[0014] Preferably, the switch structure is disposed on the corresponding magnetic trigger structure, and the switch structure is closed when the moving magnetic conductor of the magnetic trigger structure is attracted to the stationary magnetic conductor.

[0015] Preferably, the switch structure includes a moving contact and a stationary contact, which are electrically connected to the self-excited trigger circuit. The moving contact and the stationary contact are respectively disposed on the moving magnetic structure and the stationary magnetic structure. In the initial position, the moving contact and the stationary contact are insulated from each other, so that the switch structure is in a normally open state. When the moving magnetic structure of the magnetic trigger structure is attracted to the stationary magnetic structure, the moving contact and the stationary contact make conductive contact, so that the switch structure is closed.

[0016] Preferably, the stationary contact has a clip-like or cylindrical structure, and the moving contact has a sheet-like structure. The moving contact is inserted into the stationary contact so that the moving contact and the stationary contact make conductive contact.

[0017] Preferably, the device includes a housing, the conductor passing through the housing, and the two ends of the conductor located outside the housing forming connection ends; the magnetic triggering device is disposed in the housing, the moving magnetic conductor structure is disposed in the housing or on the outer surface of the housing, the stationary contact is fixedly disposed on the housing, the self-excited triggering circuit is disposed on the housing or outside the housing, and the moving contact is electrically and flexibly connected to the self-excited triggering circuit.

[0018] The present invention also provides an excitation fuse, wherein the above-mentioned anti-vibration magnetic triggering device is integrated inside or outside the excitation fuse. The excitation fuse includes an excitation source, a piston, and the conductive busbar. One end of the conductive busbar extends to form the conductor of the anti-vibration magnetic triggering device, or the conductive busbar is electrically connected to the conductor. The self-excitation triggering circuit is connected in series with the signal receiving end of the excitation source, and provides a self-excitation triggering signal to the excitation source through the self-excitation triggering circuit.

[0019] Preferably, the signal receiving end of the excitation source can also be connected to an external active triggering circuit, which provides an active triggering signal to the excitation source.

[0020] The anti-vibration magnetic triggering device of the present invention, by setting magnetic triggering structures on different sides of the conductor, ensures that the displacement direction of the moving magnetic conductor structure of the magnetic triggering structure is different. Combined with the reaction force device set between the moving magnetic conductor structures of at least two sets of magnetic triggering structures, it ensures that during vibration, at least one set of magnetic triggering structures, under the action of the reaction force device, will not have its moving magnetic conductor structure displace towards the stationary magnetic conductor structure, keeping the linked switch structure in a normally open state. This ensures that the self-excited triggering circuit will not conduct during vibration and will always remain in an open state. Only when the current exceeds a threshold and the attraction force generated by the magnetic field is greater than the reaction force of the reaction force device can the magnetic triggering structure close all the switch structures in the self-excited triggering circuit, thus turning on the self-excited triggering circuit.

[0021] When integrated with an excitation fuse, the conduction of the self-excitation trigger circuit is controlled by a magnetic triggering device. The self-excitation trigger circuit provides a self-excitation trigger signal to the excitation source, eliminating the need for a signal fuse and shortening the operating time of the excitation fuse.

[0022] The excitation fuse of the present invention can provide a self-excitation trigger signal or an active trigger signal to the excitation source through an active trigger circuit and a self-excitation trigger circuit, respectively, thereby broadening the excitation fuse's ability to cope with different abnormal situations and improving the breaking reliability of the excitation fuse.

[0023] The anti-vibration magnetic triggering device of this invention improves the vibration resistance of the excitation fuse and avoids malfunctions. By employing this device, a self-triggering protection method for the excitation fuse is achieved. Compared to existing self-triggering methods, such as those that use the voltage signal at the fuse break point as the trigger signal source, existing methods require a longer time for the fuse to melt and for sending the trigger signal under abnormally low current conditions. Therefore, the excitation fuse of this invention can respond immediately when the low current reaches a set threshold under abnormally low current conditions, improving response speed and shortening response time. Simultaneously, it has strong vibration resistance, making the product safer and more reliable. Attached Figure Description

[0024] Figure 1 This is a cross-sectional structural diagram of an excitation fuse integrated with an anti-vibration magnetic triggering device.

[0025] Figure 2 This is a top view of the excitation fuse with an integrated anti-vibration magnetic triggering device.

[0026] Figure 3 This is a schematic diagram showing the connection between the excitation source and the self-excitation triggering circuit of an excitation fuse that integrates an anti-vibration magnetic triggering device.

[0027] Figure label:

[0028] Excitation fuse 1, excitation fuse housing 100, excitation fuse conductor 101, excitation source 102, interruption device 103, protective sleeve 104, displacement channel 105, arc extinguishing chamber 106, fusible element cutting device 107, fusible element 108;

[0029] 2. Vibration-resistant magnetic triggering device, 201. Magnetic triggering device conductor, 202. Static magnetic conductor, 203. Magnetic triggering device housing, 204. Insulating actuating component, 205. Moving magnetic conductor, 206. Fixed spring, 207.

[0030] Self-excited triggering circuit 3, power supply 301, switch structure 302, stationary contact 303, moving contact 304. Detailed Implementation

[0031] The present invention provides an anti-vibration magnetic triggering device, comprising a conductor that can be connected in series into a main circuit, at least two sets of magnetic triggering structures arranged at intervals around the conductor, and a self-excited triggering circuit. The magnetic triggering structures are located in the magnetic field formed when the conductor is energized. The self-excited triggering circuit is connected in series with a switch structure corresponding to each set of magnetic triggering structures, and the switch structure is normally open.

[0032] Each set of magnetic triggering structures includes a static magnetic conductor and a dynamic magnetic conductor structure. A moving air gap is maintained between the static magnetic conductor and the dynamic magnetic conductor structure. The dynamic magnetic conductor structure is linked with its corresponding switch structure. When the dynamic magnetic conductor structure of each set of magnetic triggering structures moves toward the static magnetic conductor, the displacement direction of the dynamic magnetic conductor structure is different. At least two sets of magnetic triggering structures are provided with a reaction force device between the dynamic magnetic conductor structures.

[0033] When the moving magnetic conductor structure is subjected to vibration, and the reaction force of the reaction device is greater than the impact force generated by the vibration that causes the moving magnetic conductor structure of the magnetic triggering structure to displace toward the stationary magnetic conductor, when one group of moving magnetic conductor structures displaces toward the corresponding stationary magnetic conductor, the reaction device acts on the other group of moving magnetic conductor structures, keeping the moving magnetic conductor structure stationary or away from the corresponding stationary magnetic conductor, so that the self-excitation triggering circuit is always in the open state.

[0034] When the current in the conductor exceeds the set threshold, the magnetic attraction force generated by the stationary magnet on the moving magnet structure is greater than the reaction force of the reaction device. The moving magnet structure is displaced towards the corresponding stationary magnet and is attracted. The switch structure linked with the moving magnet structure closes. When all magnetic triggering devices are activated to close the corresponding switch structure, the self-excited triggering circuit is turned on.

[0035] When there are two sets of magnetic triggering structures, they are positioned on opposite or adjacent sides in the direction of the conductor current. When there are three sets of magnetic triggering structures, they are located on three sides in the direction of the conductor current. A switch structure, corresponding to each of the three sets of magnetic triggering structures, is connected in series in the self-excited triggering circuit. The switch structure is linked to its corresponding magnetic triggering structure; the self-excited triggering circuit can only conduct when all switch structures are closed. To ensure that the self-excited triggering circuit does not malfunction, a reaction force device is installed between at least two sets of magnetic triggering structures to ensure that at least one set of magnetic triggering structures does not malfunction during vibration, keeping the self-excited triggering circuit in an open, non-conductive state.

[0036] The excitation fuse of the present invention integrates the above-mentioned anti-vibration magnetic triggering device inside or outside the excitation fuse. The excitation fuse includes an excitation source, a piston, and a conductive busbar. One end of the conductive busbar extends to form a conductor of the anti-vibration magnetic triggering device, or the conductive busbar is electrically connected to the conductor. The self-excitation triggering circuit is connected in series with the signal receiving end of the excitation source, and provides a self-excitation triggering signal to the excitation source through the self-excitation triggering circuit.

[0037] The signal receiving end of the excitation source can also be connected to an external active triggering circuit, which provides an active triggering signal to the excitation source.

[0038] The preferred embodiments are described below in conjunction with the figures to illustrate the above technical solution, taking the anti-vibration magnetic triggering device including two sets of magnetic triggering structures as an example.

[0039] See Figure 1 and Figure 2 It includes an excitation fuse 1 and an anti-vibration magnetic triggering device 2.

[0040] The excitation fuse 1 includes an excitation fuse housing 100, an excitation fuse conductor 101 passing through the excitation fuse housing 100, an excitation source 102 and a breaking device 103 are provided on one side of the excitation fuse conductor 101, and the breaking device 103 is provided corresponding to the excitation fuse conductor 101. In this embodiment, the breaking device 103 is a piston. The two ends of the excitation fuse conductor 101 are located outside the excitation fuse housing 100. One end is electrically connected to the magnetic trigger device conductor 201 of the anti-vibration magnetic trigger device 2, and the other end is a free end serving as one of the terminals of the excitation fuse 1 integrated with the anti-vibration magnetic trigger device 2.

[0041] A protective sleeve 104 is provided between the breaking device 103 and the inner wall of the cavity of the excitation fuse housing 100. The protective sleeve 104 and the excitation fuse housing 100 are sealed with a gap. The breaking device 103 and the protective sleeve 104 are also sealed with a gap. One end of the excitation source 102, which releases the driving force, passes through the protective sleeve 104 and is located inside the protective sleeve 104. The cavity where the excitation source 102 releases the driving force is located is connected to the cavity where the breaking device 103 is located away from the excitation fuse conductor 101, and is a sealed cavity. The excitation source 102 is a gas generating device. The high-pressure gas released by the excitation source 102 can be used as the driving force according to the received trigger signal to drive the breaking device 103 to move and disconnect the excitation fuse conductor 101. A displacement channel 105 is provided on the excitation fuse housing 101 on the other side of the excitation fuse conductor 101. An arc-extinguishing chamber 106 is provided on both sides of the displacement channel 105, and the arc-extinguishing chamber 106 is filled with an arc-extinguishing medium. A fusible element cutting device 107 is provided in the displacement channel 105. After the fusible element 108 passes through the arc-extinguishing medium in the arc-extinguishing chamber 106 and the displacement channel 105, both ends of the fusible element 108 are electrically connected to the excitation fuse conductor 101, forming a parallel connection between the fusible element 108 and the excitation fuse conductor 101. The two ends of the fusible element 108 are located on both sides of the break formed after the excitation fuse conductor 101 is broken by the breaking device 103. When the excitation fuse conductor 101 is broken, the current flowing through the excitation fuse conductor 101 will flow through the fusible element 108. The resistance of the fusible element 108 is much greater than the resistance of the excitation fuse conductor 101. Therefore, during normal current flow, almost all the current flows through the excitation fuse conductor 101, and the current flowing through the fusible element 108 is negligible. The melt cutting device 107 clamps the melt 108 located in the displacement channel 105. When the breaking device 103 disconnects the excitation fuse conductor 101, the melt cutting device 107 can be driven to move along the displacement channel to cut off the melt 108.

[0042] In other embodiments, the structure of the excitation fuse 1 can be satisfied by including an excitation source, a breaking device, and an excitation fuse conductor. That is, any existing excitation fuse that includes an excitation source, a breaking device, and an excitation fuse conductor can be used in this invention and integrated with the anti-vibration magnetic triggering device 2.

[0043] The vibration-resistant magnetic triggering device 2 includes a magnetic triggering device conductor 201. At least two sets of stationary magnetic conductors (202, 203) are spaced around the conductor 201. The stationary magnetic conductors (202, 203) are C-shaped or U-shaped. The magnetic triggering device conductor 201 is located in the C-shaped or U-shaped grooves of the stationary magnetic conductors (202, 203). The open ends of the stationary magnetic conductors (202, 203) protrude from one side of the magnetic triggering device conductor 201 to ensure that the magnetic triggering device conductor 201 is not affected when the moving magnetic conductor structure is engaged. An insulating layer is provided on the inner wall of the groove through which the magnetic triggering device conductor 201 passes in the stationary magnetic conductors (202, 203) to prevent the stationary magnetic conductors (202, 203) from interfering with the operation of the triggering device conductor 201. The magnetic triggering device conductor 201 is electrically connected to the excitation fuse conductor. In this embodiment, the magnetic triggering device conductor 201 and the excitation fuse conductor are integrally formed as a single conductor. The free end of the magnetic trigger device conductor 201 of the anti-vibration magnetic trigger device 2 and the free end of the excitation fuse conductor of the excitation fuse 1 serve as the two terminals of the excitation fuse integrated with the anti-vibration magnetic trigger device 2.

[0044] The openings of the static magnets (202, 203) are arranged in opposite directions or perpendicularly. In this embodiment, the openings of the static magnets (202, 203) are arranged in opposite directions. The static magnets are made of electrical pure iron or other magnetically conductive materials. The contact surface between the static magnets and the moving magnets is a slope or a plane. The slope increases the contact area and shortens the gap, thereby increasing the initial force. The static magnets (202, 203) are fixed by the magnetic trigger device housing 204, so that the openings of the static magnets (202, 203) are located on the outer surface of the magnetic trigger device housing 204 and protrude appropriately from the outer surface of the magnetic trigger device housing 204 to facilitate structural engagement with the moving magnets.

[0045] A corresponding set of moving magnetic structures is provided on one side of the open end of each set of static magnetic conductors (202, 203), forming a set of magnetic triggering structures, such as... Figure 1 and Figure 2As shown, the vibration-resistant magnetic triggering device 2 includes two sets of magnetic triggering structures. Each set of moving magnetic body structures includes an insulating actuating element 205 and a moving magnetic body 206. The moving magnetic body 206 is fixedly disposed on the side of the insulating actuating element 205 facing the opening end of the stationary magnetic body, and the moving magnetic body 206 is positioned directly opposite the opening end of the stationary magnetic bodies (202, 203). The moving magnetic body 206 spans the width of the opening end of the stationary magnetic body to ensure that the moving magnetic body can be stably attracted to the opening end of the stationary magnetic body. The moving magnetic body structure can be disposed on one side of the opening end of the stationary magnetic body in a flat snapping or rotational snapping manner. In this embodiment, the moving magnetic body structure is disposed on one side of the opening end of the stationary magnetic bodies (202, 203) in a rotational snapping manner. The specific structure of the rotational engagement method is as follows: one end of the insulating actuating component 205 is hinged to the magnetic trigger device housing 204 on one side of the open end of the stationary magnetic conductors (202, 203), and the other end of the insulating actuating component 205 crosses over the open end of the stationary magnetic conductors (202, 203) and is suspended on the other side of the stationary magnetic conductors (202, 203). The suspended end of the insulating actuating component 205 is connected to the magnetic trigger device housing 204 through a fixing spring 207, which provides elastic support to the suspended end of the insulating actuating component 205. In the initial position, the moving magnetic conductor structure and the open end of the stationary magnetic conductors (202, 203) are set at a certain angle, so that an air gap is maintained between the moving magnetic conductor structure and the open end of the stationary magnetic conductors (202, 203). Since the open ends of the static magnets (202, 203) are arranged in opposite directions—that is, the open ends of the static magnets (202, 203) are located on opposite sides of the conductor 201 of the magnetic trigger device—the operation of the moving magnet structures corresponding to the static magnets (202, 203) does not affect each other. To prevent both sets of magnetic trigger structures from being attracted together during vibration when the anti-vibration magnetic trigger device is subjected to vibration, a reaction device is provided between the moving magnet structures corresponding to the static magnets (202, 203). In this example, the reaction device is a reaction spring (not shown). The reaction spring passes through the housing of the magnetic trigger device, and its two ends are fixedly connected to the insulating actuators of the moving magnet structures corresponding to the static magnets (202, 203). For better reaction effect, the suspended end of the moving magnet structure corresponding to the static magnets (202, 203) faces the same side of the magnetic trigger device housing, and the reaction spring is positioned close to the suspended end of the moving magnet structure.With this configuration, when the moving magnetic conductor of one set of magnetic trigger structures is vibrated and displaces towards the stationary magnetic conductor, it simultaneously drives the reaction spring to displace towards the moving magnetic conductor of another set of magnetic contact structures on the other side of the magnetic trigger device housing. This compresses the reaction spring, which generates elastic force. Under the push and elastic force of the reaction spring, the moving magnetic conductor of the other set of magnetic contact structures on the other side of the magnetic trigger device housing overcomes the impact force generated by the vibration and remains in its original position, or displaces away from its corresponding stationary magnetic conductor. This ensures that at least one set of magnetic trigger structures will not malfunction when subjected to vibration, and that the moving magnetic conductor of that set of magnetic trigger structures will not displace towards its corresponding stationary magnetic conductor, thus keeping the linked switch structure in a normally open state.

[0046] Self-excited triggering circuit 3, see reference. Figure 3 The circuit consists of a power supply 301 and two sets of switch structures 302 connected in series. The switch structures 302 are normally in the open state. The number of switch structures 302 is the same as the number of magnetic trigger structures; that is, one set of magnetic trigger structures controls one set of switch structures. The magnetic trigger structures control the closing of the switch structures 302 through linkage with the switch structures 302.

[0047] Each set of switch structures 302 includes a stationary contact 303 and a moving contact 304. The moving contact 304 of each set of switch structures 302 is fixedly mounted on the suspended end of the insulating actuating component of the moving magnetic conductor structure of its corresponding magnetic trigger structure. The moving contact 304 is electrically connected to the self-excited trigger circuit via a flexible connecting wire. The stationary contact 303 corresponding to the moving contact 304 is fixedly mounted on the outer surface of the magnetic trigger device housing 204. When the moving magnetic conductor structure moves toward the stationary magnetic conductor and is attracted, the moving contact 304 makes conductive contact with its corresponding stationary contact 303, causing the switch structure 302 to change from a normally open state to a closed state. Only when all the switch structures 302 corresponding to each set of magnetic trigger structures are closed can the self-excited trigger circuit 3 be turned on.

[0048] The moving contact 304 is made of copper or other metal and has a sheet-like structure. The stationary contact is made of beryllium bronze or other metal. The stationary contact 303 can be configured as a clip-like structure or a cylindrical structure. In the clip-like structure, it can be formed by two metal sheets or by bending a single metal sheet. When the stationary contact is formed by two metal sheets, the two sheets are insulated from each other, and each pair of metal sheets is electrically connected to a self-excited trigger circuit. The insulation between the two metal sheets keeps the switch structure in a normally open state. In this case, the moving contact does not need to be connected to the self-excited trigger circuit; simply inserting the moving contact between the two metal sheets to conduct electricity to the stationary contact will close the switch structure.

[0049] When the moving contact 304 moves toward the stationary contact 303, the sheet-like structure of the moving contact 304 can be inserted into the clamp-like structure or the cylindrical structure of the stationary contact 303, so that the moving contact and the stationary contact can make conductive contact.

[0050] See Figure 3 The two signal receiving terminals of the excitation source 102 of the excitation fuse 1 are connected in series into the self-excitation trigger circuit 3. The self-excitation trigger circuit 3 provides a self-excitation trigger signal to the excitation source 102. Under normal working conditions, the switch structure 302 of the current self-excitation trigger circuit 3 is normally open, so the self-excitation trigger circuit is not conducting.

[0051] The signal receiving end of the excitation source 102 can also be connected to an external active triggering circuit. The external active triggering circuit provides an active triggering signal to the excitation source 102. For example, when the excitation fuse is used in an electric vehicle, in the event of a collision or fire, the vehicle's control system controls the active triggering circuit to provide an active triggering signal to the excitation source 102, triggering it to activate and disconnect the main circuit. Alternatively, it can be used in the triggering...

[0052] Working principle:

[0053] Under normal operating conditions, current flows through the conductors of the excitation fuse 1 and the anti-vibration magnetic triggering device 2. The triggering device does not operate, the switch is normally open, the self-excitation triggering circuit is not connected, and the excitation source does not operate.

[0054] When the current flowing through the conductors of the excitation fuse 1 and the anti-vibration magnetic triggering device 2 exceeds the threshold, the magnetic triggering structure of the anti-vibration magnetic triggering device 2 is activated, causing the switching structure of the self-excitation triggering circuit 3 to close, thus making the self-excitation triggering circuit conduct and providing a self-excitation triggering signal to the excitation source 102. The excitation source 102 is activated according to the received self-excitation triggering signal, releasing high-pressure gas as a driving force to drive the breaking device 103 to displace, disconnecting the excitation fuse conductor 101, and then driving the fusible element cutting device to displace, disconnecting the fusible element connected in parallel to the excitation fuse conductor 101.

Claims

1. A vibration-resistant magnetic triggering device, characterized in that, It includes a conductor that can be connected in series into the main circuit, at least two sets of magnetic triggering structures spaced apart around the conductor, and a self-excited triggering circuit, wherein the magnetic triggering structures are located in the magnetic field formed when the conductor is energized; The self-excited triggering circuit is connected in series with a switch structure that corresponds one-to-one with each group of magnetic triggering structures, and the switch structure is normally open. Each set of magnetic triggering structures includes a stationary magnet and a moving magnet structure, with a movement air gap maintained between the stationary and moving magnet structures. The moving magnet structure is linked to its corresponding switch structure. When the moving magnet structure of each set of magnetic triggering structures moves toward the stationary magnet, the displacement direction of the moving magnet structure is different. At least two sets of magnetic triggering structures have a reaction force device between their moving magnet structures. When the moving magnetic structure is subjected to vibration, and the reaction force of the reaction device is greater than the impact force generated by the vibration that causes the moving magnetic structure of the magnetic triggering structure to displace toward the stationary magnetic structure, when one group of moving magnetic structures displaces toward the corresponding stationary magnetic structure, the reaction device acts on the other group of moving magnetic structures, so that the moving magnetic structure remains stationary or moves away from the corresponding stationary magnetic structure, and the self-excited triggering circuit is always in the open state. When the current in the conductor exceeds a set threshold, the magnetic attraction force generated by the stationary magnet on the moving magnet structure is greater than the reaction force of the reaction device. The moving magnet structure is displaced and attracted in the direction of the corresponding stationary magnet. The switch structure linked with the moving magnet structure closes. When all magnetic triggering devices are activated to close the corresponding switch structure, the self-excited triggering circuit is turned on.

2. The anti-vibration magnetic triggering device according to claim 1, characterized in that, The moving magnetic conductor structure is arranged on opposite sides or adjacent sides of the conductor current direction.

3. The anti-vibration magnetic triggering device according to claim 2, characterized in that, The stationary magnet is U-shaped or C-shaped and is arranged around the conductor. The conductor passes through the groove of the U-shaped or C-shaped stationary magnet. The moving magnet structure is arranged at the open end of the stationary magnet, and a moving air gap is maintained between the moving magnet structure and the open end of the stationary magnet.

4. The anti-vibration magnetic triggering device according to claim 2, characterized in that, When the moving magnetic structures are located on opposite sides of the conductor, the reaction device is a reaction spring, and the moving magnetic structures are connected to each other by reaction springs.

5. The anti-vibration magnetic triggering device according to claim 4, characterized in that, The moving magnetic conductor structure includes an insulating actuating element and a moving magnetic conductor. The moving magnetic conductor is disposed on the side of the insulating actuating element facing the stationary magnetic conductor and is directly opposite the stationary magnetic conductor. The reaction device is disposed between the insulating actuating elements of the moving magnetic conductor structure.

6. The anti-vibration magnetic triggering device according to claim 5, characterized in that, One end of the insulating actuating component is hinged to one side of the stationary magnet, and the other end is suspended across the stationary magnet and supported by a support spring.

7. The anti-vibration magnetic triggering device according to claim 1, characterized in that, The switch structure is disposed on the corresponding magnetic trigger structure. When the moving magnetic conductor of the magnetic trigger structure is attracted to the stationary magnetic conductor, the switch structure is closed.

8. The anti-vibration magnetic triggering device according to claim 7, characterized in that, The switch structure includes a moving contact and a stationary contact, which are electrically connected to the self-excited trigger circuit. The moving contact and the stationary contact are respectively disposed on the moving magnetic structure and the stationary magnetic structure. In the initial position, the moving contact and the stationary contact are insulated from each other, so that the switch structure is in a normally open state. When the moving magnetic structure of the magnetic trigger structure is attracted to the stationary magnetic structure, the moving contact and the stationary contact make conductive contact, so that the switch structure is closed.

9. The anti-vibration magnetic triggering device according to claim 8, characterized in that, The stationary contact has a clip-shaped or cylindrical structure, and the moving contact has a sheet-shaped structure. The moving contact is inserted into the stationary contact so that the moving contact and the stationary contact make conductive contact.

10. The anti-vibration magnetic triggering device according to any one of claims 1 to 9, characterized in that, The device includes a housing, a conductor passing through the housing, and two ends of the conductor located outside the housing forming connection ends; a magnetic triggering device is disposed in the housing, a moving magnetic conductor structure is disposed in the housing or on the outer surface of the housing, a stationary contact of a switch structure is fixedly disposed on the housing, a self-excited triggering circuit is disposed on the housing or outside the housing, and the moving contact of the switch structure is electrically and flexibly connected to the self-excited triggering circuit.

11. An excitation fuse, characterized in that, The excitation fuse is integrated with an anti-vibration magnetic triggering device according to any one of claims 1 to 10, the excitation fuse including an excitation source, a piston and a conductive busbar, one end of the conductive busbar extending to form the conductor of the anti-vibration magnetic triggering device, or the conductive busbar is electrically connected to the conductor; the self-excitation triggering circuit is connected in series with the signal receiving end of the excitation source, and provides a self-excitation triggering signal to the excitation source through the self-excitation triggering circuit.

12. The excitation fuse according to claim 11, characterized in that, The signal receiving end of the excitation source can also be connected to an external active triggering circuit, which provides an active triggering signal to the excitation source.

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