Magnetic trigger device and excitation fuse
By designing a magnetic trigger device in the excitation fuse and using limit shrapnel to ensure contact reliability, the existing excitation fuse protection function dependence control system and poor contact reliability is solved, and higher working reliability and impact resistance are achieved.
Patent Information
- Application Number
- CN202421506464.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2034-06-28
AI Technical Summary
In the new energy fields such as electric vehicles, the existing excitation fuses are implemented with a control system. They cannot self-cut the circuit by sensing large currents. The contact reliability and impact vibration resistance of normally open contacts are poor, resulting in delays or failures in protection cutoff.
A magnetic trigger device is designed to define the position after the magnetic trigger device is operated through the coordinated limiting shrapnel to ensure reliable contact. The device includes a moving magnet structure, a static magnet, a limiting shrapnel and a normally open trigger assembly. The dynamic contact plate and the static contact plate conduct electrical contact during the displacement of the movable magnet structure, and the limiting shrapnel form a limit on the termination position of the movable magnet structure.
Improve the working reliability of the excitation fuse, ensure the reliability of contact and impact vibration resistance, and avoid protective cut-off delays or failures.
Smart Images
Figure CN222762906U_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of circuits, specifically to electric vehicles and other power control fields, and in particular to a magnetic trigger device and an excitation fuse for changing the circuit state in the field of new energy direct current power distribution. Background Art
[0002] Existing excitation fuses, especially those used in new energy fields such as electric vehicles, are mainly based on active protection, that is, when the control system (BMS) detects abnormal conditions such as short circuit in the main circuit and needs to cut off the circuit, the control system needs to provide a trigger signal to the trigger device of the excitation fuse, and the excitation fuse can cut off the circuit. In other words, the excitation fuse is an actuator, and the realization of its protection function is completely dependent on the control system. It cannot cut off the circuit by itself by sensing large currents; based on this, an active intelligent excitation fuse equipped with a magnetic trigger module has been developed. This product adds a passive protection function on the basis of the original excitation fuse that can accept active control of the system. The basic principle is to add a set of external power supplies, which are connected to the trigger interface of the excitation fuse through a normally open contact; at the same time, a magnetic trigger device is provided on the main circuit of the excitation fuse, see the active and passive integrated protection device disclosed in Chinese patent application 2023224539282. After the current in the main circuit reaches the expected value, the device closes the normally open contact set in the circuit through the movement of the movable armature, thereby connecting the passive trigger circuit of the excitation fuse and triggering the excitation fuse to achieve the passive protection function. In this scheme, the contact reliability of the normally open contact is very important. If overlapping contacts or micro switches are used, there will be contact bounce or unreliable contact during the contact process, which will cause the passive protection of the excitation fuse to be delayed or even fail to cut off the protection. In addition, the impact and vibration resistance of conventional contacts is poor, and there will be false triggering. Summary of the invention
[0003] The purpose of the present invention is to provide a magnetic trigger device and an excitation fuse. The magnetic trigger device uses a matching limiting spring to limit the position of the magnetic trigger device after it is actuated, thereby ensuring reliable contact and preventing rebound after contact that leads to poor contact, thereby improving working reliability.
[0004] To achieve the above-mentioned purpose, the technical solution provided by the present invention is a magnetic trigger device, comprising a dynamic magnetic conductive structure, a static magnetic conductive structure, a limit spring, and a normally open trigger component, wherein the trigger component comprises a dynamic contact piece and a static contact piece;
[0005] The static magnet is arranged around the main circuit conductive bar, the dynamic magnet structure is displaceably arranged on one side of the static magnet, and the dynamic magnet structure and the static magnet are located on the magnetic field path generated after the conductive bar is energized; in the initial position, an air gap is retained between the dynamic magnet structure and the static magnet;
[0006] The dynamic contact piece is displaceably located between the dynamic magnetic conductive structure and the static contact piece, and the dynamic contact piece is located on the displacement path of the dynamic magnetic conductive structure;
[0007] The limiting spring piece is located outside one end of the moving magnetizer close to the moving contact piece, one end of the limiting spring piece is fixed, and the other end is suspended to form a free end, and the suspended limiting spring piece part is located on the displacement path of the moving magnetizer structure;
[0008] When the current of the main circuit conductive row exceeds a set threshold value, the dynamic magnetic structure is driven by the magnetic field force generated by the static magnetic body to displace toward the static magnetic body; during the displacement of the dynamic magnetic structure, the dynamic magnetic structure drives the dynamic contact piece and the limiting spring piece to displace respectively, so that the dynamic contact piece is in conductive contact with the static contact piece, so that the limiting spring piece limits the terminal position of the dynamic magnetic structure, and the dynamic magnetic structure limits the terminal position of the dynamic contact piece.
[0009] Preferably, the dynamic magnet structure includes a dynamic magnet and an insulating support, the dynamic magnet is arranged on the side surface of the insulating support facing the static magnet; the dynamic contact piece is displaceably located between the insulating support and the static contact piece, and the dynamic contact piece is located on the displacement path of the insulating support; the limiting spring piece is located on the outer side of one end of the insulating support close to the dynamic contact piece, one end of the limiting spring piece is fixed, and the other end is suspended to form a free end, and the suspended limiting spring piece portion is located on the displacement path of the insulating support.
[0010] Preferably, an extension portion with a protruding end is provided at one end of the insulating support member facing the limiting spring sheet, and the suspended limiting spring sheet portion is located on the displacement path of the extension portion of the insulating support member; when the dynamic magnetic conductive structure is displaced from the initial position to the terminal position, the extension portion of the insulating support member abuts against the limiting spring sheet and displaces toward the free end of the limiting spring sheet; the free end of the limiting spring sheet is located on the displacement path of the insulating support member, and when the dynamic magnetic conductive structure is displaced to the terminal position, the free end of the limiting spring sheet is displaced to the side of the extension portion away from the static contact sheet, and abuts against the side of the extension portion of the insulating support member, thereby limiting the terminal position of the dynamic magnetic conductive structure; or, a limiting hole is provided on the limiting spring sheet, and the limiting hole is located on the displacement path of the extension portion of the insulating support member; when the dynamic magnetic conductive structure is displaced to the terminal position, the extension portion of the insulating support member is inserted into the limiting hole of the limiting spring sheet, thereby limiting the terminal position of the dynamic magnetic conductive structure.
[0011] Preferably, when a limiting hole is provided on the limiting spring sheet, a limiting hole is also provided on the moving contact piece, and the free end of the limiting spring sheet is in a bent structure. In the initial position, the free end of the limiting spring sheet is hooked in the limiting hole of the moving contact piece to limit the initial position of the moving contact piece; as the insulating support member is displaced, the free end of the limiting spring sheet is disengaged from the contact with the limiting hole of the moving contact piece.
[0012] Preferably, when the static contact piece is a single piece, the dynamic contact piece and the static contact piece can be respectively conductively connected to one end of the circuit, and the dynamic contact piece is connected to the circuit in a software connection manner; a contact channel for the dynamic contact piece to be displaced is provided on one side of the static contact piece, or the static contact piece is bent into a clip-like structure to form a contact channel for the dynamic contact piece to be displaced; the dynamic magnetic conductive structure can drive the dynamic contact piece to displace along the contact channel and conductively contact the static contact piece.
[0013] Preferably, when the static contact piece is two pieces, the static contact piece includes a first static contact piece and a second static contact piece that are insulated from each other, and the first static contact piece and the second static contact piece can be respectively conductively connected to one end of the circuit; the first static contact piece and the second static contact piece are arranged in an inverted Y-shaped clip shape, and the first static contact piece and the second static contact piece are in an open trumpet-shaped structure toward one end of the moving magnetic conductor, and the other end is an insulating contact channel arranged in parallel and spaced apart; the dynamic contact piece is located between one end of the open trumpet-shaped structure of the first static contact piece and the second static contact piece and the insulating support member; when the insulating support member drives the dynamic contact piece to displace, the dynamic contact piece passes through the trumpet-shaped structure and enters the contact channel, and is in conductive contact with the first static contact piece and the second static contact piece, so that the first static contact piece and the second static contact piece are conductive.
[0014] Preferably, an insulating guide structure is arranged between one end of the open trumpet-shaped structure of the first static contact piece and the second static contact piece and the dynamic magnetic conductive structure, and the dynamic contact piece is a flat plate structure, one end of which is located in the guide structure, and the other end is located between the guide structure and the dynamic magnetic conductive structure; when the dynamic magnetic conductive structure drives the dynamic contact piece to displace, the dynamic contact piece displaces along the guide structure and is inserted into the contact channel between the first static contact piece and the second static contact piece.
[0015] Preferably, when the free end of the limiting spring piece is located on the displacement path of the dynamic magnetic conductive structure, one end of the dynamic contact piece away from the first static contact piece and the second static contact piece is fixed on the dynamic magnetic conductive structure, and the other end of the dynamic contact piece is suspended in one end of the open trumpet-shaped structure of the first static contact piece and the second static contact piece; with the displacement of the dynamic magnetic conductive structure, the dynamic contact piece is displaced along one end of the open trumpet-shaped structure of the first static contact piece and the second static contact piece, and is inserted into the contact channel between the first static contact piece and the second static contact piece, so that the first static contact piece and the second static contact piece are in conductive contact.
[0016] Preferably, wings are arranged on opposite sides of the outer periphery of the moving contact piece, and the two wings are fixed on the moving contact piece at one end away from the insulating support member, and are suspended toward the other end of the moving magnetic conductive structure, so that the two wings are in an eight-shaped structure; limiting holes are respectively opened on the first static contact piece and the second static contact piece at the narrowed end close to the trumpet-shaped structure corresponding to the wings, and when the moving contact piece moves to the end position, the two wings are respectively clamped in the limiting holes on the first static contact piece and the second static contact piece.
[0017] Preferably, the edge of one end of the moving contact piece that can contact the static contact piece is set to a sharp blade-like structure. When the moving contact piece and the static contact piece are in conductive contact, the edge of the blade-like structure of the moving contact piece contacts the surface of the static contact piece, and the oxide film on the contact surface of the static contact piece can be scraped and removed.
[0018] Preferably, the static magnet is a semi-enclosed structure, and the main circuit conductive row can be inserted into the groove formed by the semi-enclosed structure of the static magnet; the dynamic magnet structure is located on the side facing the open end of the static magnet; one end of the dynamic magnet structure is hinged on the side of the static magnet, and the other end of the dynamic magnet structure is a free end, and one end of the dynamic magnet structure facing the limiting spring sheet crosses the open end of the static magnet and is located on the other side of the static magnet; the limiting spring sheet, and the trigger assembly formed by the dynamic contact sheet and the static contact sheet are respectively located on the side of the static magnet where the limiting spring sheet is located; a support spring is fixedly arranged on the side of the static magnet where the moving contact sheet is located, and the support spring is connected to the dynamic magnet structure, and the extension direction of the support spring is the same as the displacement direction of the dynamic magnet structure; the dynamic contact sheet is located on the displacement path of the dynamic magnet structure; when the dynamic magnet structure rotates and displaces relative to the static magnet, the dynamic magnet structure drives the dynamic contact sheet to displace.
[0019] Preferably, the static magnet is a semi-enclosed structure, and the main circuit conductive bar can be inserted into the groove formed by the semi-enclosed structure of the static magnet; the dynamic magnet structure is located on the side opposite to the open end of the static magnet, and is arranged parallel to the open end of the static magnet; both ends of the insulating support are free ends, and are respectively located on both sides of the static magnet, and the support springs located on both sides of the static magnet are respectively connected to the dynamic magnet structure to form support for the dynamic magnet structure; the dynamic contact piece is located on the displacement path of the dynamic magnet structure; when the dynamic magnet structure displaces toward the static magnet in a translational manner, the dynamic magnet structure drives the dynamic contact piece to displace.
[0020] Preferably, it also includes a shell structure, and the dynamic magnetic conductive structure, the static magnetic conductive body, the limit spring piece, the dynamic contact piece, and the static contact piece are respectively integrated in the shell structure.
[0021] Preferably, an insulating layer is provided between the static magnetic conductor and the surrounding main circuit conductive bar.
[0022] The present invention also provides an excitation fuse, comprising an excitation source, a conductive bar that can be connected in series with a main circuit, a cut-off device corresponding to the conductive bar, and a trigger circuit; the trigger circuit is connected to the signal receiving end of the excitation source to provide a self-excitation trigger signal for it; the above-mentioned magnetic trigger device is arranged on the conductive bar, and the magnetic trigger device is connected in series with the trigger circuit, and the series connection method includes: when the static contact piece of the magnetic trigger device is one piece, the dynamic contact piece and the static contact piece of the magnetic trigger device are respectively conductively connected to the trigger circuit, and in the initial position, the dynamic contact piece and the static contact piece are insulated, and the trigger circuit is in a non-conductive state; when the static contact piece includes a first static contact piece and a second static contact piece, the first static contact piece and the second static contact piece are respectively connected in series with the trigger circuit, and in the initial position, the dynamic contact piece, the first static contact piece, and the second static contact piece are insulated from each other, and the trigger circuit is in a non-conductive state;
[0023] When the current of the conductive bus exceeds a set threshold, the magnetic trigger device is actuated, the movable contact piece is in conductive contact with the static contact piece, and when the static contact piece includes a first static contact piece and a second static contact piece, the movable contact piece is in conductive contact with the first static contact piece and the second static contact piece, respectively, thereby turning on the trigger circuit, and the trigger circuit sends a self-excitation trigger signal to the excitation source. The excitation source is actuated according to the received trigger signal, and releases high-pressure gas as a driving force, driving the cutting device to move, cutting off the conductive bus, and thus disconnecting the main circuit.
[0024] The magnetic trigger device of the present invention can be used in an excitation fuse, or in an electrical circuit that switches a normally open contact to a normally closed contact due to an external response. When used in an excitation fuse, its structure is:
[0025] The excitation fuse of the present invention comprises an excitation source, a conductive bar which can be connected in series with a main circuit, a cutting device arranged corresponding to the conductive bar, and a trigger circuit; the trigger circuit is connected to a signal receiving end of the excitation source to provide a self-excitation trigger signal therefor; the above-mentioned magnetic trigger device is arranged on the conductive bar, and the first static contact piece and the second static contact piece of the magnetic trigger device are respectively connected in series with the trigger circuit, and in the initial position, the trigger circuit is in a non-conducting state; when the current of the conductive bar exceeds a set threshold value, the magnetic trigger device is actuated, and the dynamic contact piece conducts the first static contact piece and the second static contact piece, thereby conducting the trigger circuit, and the trigger circuit sends a self-excitation trigger signal to the excitation source, and the excitation source is actuated according to the received trigger signal, releasing high-pressure gas as a driving force, driving the cutting device to move, and cutting off the conductive bar, thereby disconnecting the main circuit.
[0026] The present invention also provides an excitation fuse, comprising an excitation source, a conductive bar that can be connected in series with a main circuit, a cutting device arranged corresponding to the conductive bar, and a trigger circuit; the trigger circuit is connected to the signal receiving end of the excitation source to provide it with a self-excitation trigger signal; the above-mentioned magnetic trigger device is arranged on the conductive bar, and the moving contact piece and the first static contact piece of the magnetic trigger device are respectively connected in series with the trigger circuit, and in the initial position, the trigger circuit is in a non-conducting state; when the current of the conductive bar exceeds a set threshold value, the magnetic trigger device is actuated, the moving contact piece and the first static contact piece are in conductive contact to turn on the trigger circuit, and the trigger circuit sends a self-excitation trigger signal to the excitation source, and the excitation source is actuated according to the received trigger signal, releasing high-pressure gas as a driving force, driving the cutting device to move, cutting off the conductive bar, thereby disconnecting the main circuit.
[0027] The magnetic trigger device of the present invention is provided with a limiting spring piece. When the dynamic magnetic conductive body structure pushes the dynamic contact piece to make conductive contact with the first static contact piece and the second static contact piece, the position of the dynamic magnetic conductive body is limited by the limiting spring piece to prevent it from rebounding along the original position, thereby ensuring that the position of the dynamic contact piece remains unchanged after movement and ensuring reliable conductive contact with the first static contact piece and the second static contact piece.
[0028] By ensuring that the distance between the first static contact piece and the second static contact piece toward the dynamic magnet and one end of the dynamic contact piece is greater than the thickness of the dynamic contact piece, and the distance away from the dynamic magnet and one end of the dynamic contact piece is less than the thickness of the dynamic contact piece, it is ensured that after the dynamic contact piece is inserted into the contact channel between the first static contact piece and the second static contact piece, an interference fit is formed between the dynamic contact piece and the first static contact piece and the second static contact piece, and the dynamic contact piece is clamped therein by the first static contact piece and the second static contact piece, ensuring that the dynamic contact piece is in reliable contact with the first static contact piece and the second static contact piece.
[0029] By setting a limiting hole on the dynamic contact piece and setting a bent limiting feature on the free end of the limiting spring piece, the initial position of the dynamic contact piece is positioned by the limiting spring piece, thereby preventing the dynamic contact piece from being displaced and contacting the first and second static contact pieces due to vibrations and other reasons in the initial state.
[0030] By replacing the second static contact piece with a moving contact piece, the number of parts can be saved.
[0031] When the magnetic trigger device of the present invention is used in an excitation fuse or in an electrical circuit in which a normally open contact is switched to a normally closed contact due to an external response, the working reliability can be improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] Figure 1 It is a schematic structural diagram of the magnetic trigger device of the present invention in an untriggered state (in the initial position).
[0033] Figure 2 yes Figure 1 Schematic diagram of the local structure after it has been triggered and the moving magnet has moved.
[0034] Figure 3 yes Figure 1 Schematic diagram of the middle limit spring structure.
[0035] Figure 4 yes Figure 1 Schematic diagram of the structure of the intermediate moving contact piece.
[0036] Figure 5 It is a schematic diagram of the structure of a magnetic trigger device of another structural form when it is not triggered (in the initial position).
[0037] Figure 6 yes Figure 5 Schematic diagram of the structure after being triggered.
[0038] Figure 7 It is a schematic diagram of the principle that the magnetic trigger device is set in the excitation fuse.
[0039] Reference numerals:
[0040] Shell structure 100, insulating support member 101, extension portion 102, dynamic magnetic conductor 1, static magnetic conductor 2, limiting spring piece 3, limiting hole 301, limiting feature 302, dynamic contact piece 4, limiting hole 401, limiting member 402, first static contact piece 5, limiting hole 501, second static contact piece 6, limiting hole 601, supporting spring 7, fixing structure 8, guiding structure 801, main circuit conductive bar 9, dynamic magnetic conductor structure 10, magnetic trigger device 11, excitation source 12, cutting device 13, trigger circuit 14, arc extinguishing fuse 15, insulating layer 16. DETAILED DESCRIPTION
[0041] The magnetic trigger device of the present invention comprises a dynamic magnetic conductive structure, a static magnetic conductive structure, a limit spring, and a normally open trigger component, wherein the trigger component comprises a dynamic contact piece and a static contact piece;
[0042] The static magnet is arranged around the main circuit conductive bar, the dynamic magnet structure is displaceably arranged on one side of the static magnet, and the dynamic magnet structure and the static magnet are located on the magnetic field path generated after the conductive bar is energized; in the initial position, an air gap is retained between the dynamic magnet structure and the static magnet;
[0043] The moving contact piece is displaceably located between the moving magnet structure and the static contact piece, and the moving contact piece is located on the displacement path of the moving magnet structure;
[0044] The limiting spring piece is located outside one end of the moving magnetizer close to the moving contact piece, one end of the limiting spring piece is fixed, and the other end is suspended to form a free end, and the suspended limiting spring piece part is located on the displacement path of the moving magnetizer structure;
[0045] When the current of the main circuit conductive bar exceeds the set threshold, the dynamic magnetic structure is driven by the magnetic field force generated by the static magnetic body to displace toward the static magnetic body; during the displacement of the dynamic magnetic structure, the dynamic magnetic structure drives the dynamic contact piece and the limiting spring piece to displace respectively, so that the dynamic contact piece and the static contact piece are in conductive contact, so that the limiting spring piece limits the terminal position of the dynamic magnetic structure, and the dynamic magnetic structure limits the terminal position of the dynamic contact piece.
[0046] The moving contact piece, the first static contact piece and the second static contact piece are respectively made of conductive materials, the material of the limiting spring piece is not limited, the moving magnet arranged opposite the static magnet in the moving magnet structure is made of conductive and magnetic material, and the insulating support member for fixing the moving magnet is made of insulating material, which ensures that the moving magnet is insulated from the moving contact piece and will not affect the resistance and power consumption of the circuit formed by the conduction between the moving contact piece and the first static contact piece and the second static contact piece.
[0047] Preferred embodiments are given below and described in detail with reference to the drawings.
[0048] The magnetic trigger device of the present invention comprises a shell structure 100 , and a dynamic magnet 1 , a static magnet 2 , a limit spring 3 , a dynamic contact piece 4 , a first static contact piece 5 and a second static contact piece 6 located in the shell structure 100 .
[0049] See also Figures 1 to 4 , the static magnet 2 is arranged around the main circuit conductive bar 9 and does not contact the main circuit conductive bar 9. In order to ensure the insulation between the main circuit conductive bar 9 and the static magnet 2 and the dynamic magnet 1, a circle of insulating layer 16 is arranged between the static magnet 2 and the main circuit conductive bar 9. The insulating layer 16 has no shielding function and only has electrical insulation performance. The main circuit conductive bar 9 is a component of the application end. For example, when the magnetic trigger device is applied to the excitation fuse, the main circuit conductive bar 9 is the conductive bar of the excitation fuse; when the magnetic trigger device is applied to other electrical circuits and switches the normally open contact of the control circuit to the normally closed contact in response to the current change of the electrical circuit, the main circuit conductive bar 9 is the conductive bar in the electrical circuit. In this embodiment, the static magnet 2 is an inverted U-shaped structure, and the main circuit conductive bar 9 can be inserted into the U-shaped groove of the static magnet 2, and the open end of the static magnet 2 protrudes from one side of the main circuit conductive bar 9. The insulating layer 16 is arranged in the U-shaped groove of the static magnet 2 , and the main circuit conductive bar 9 can pass through the hollow part of the insulating layer 16 .
[0050] The dynamic magnet structure 10 includes an insulating support 101, on which a dynamic magnet 1 is fixedly arranged on the side of the insulating support 101 facing the open end of the static magnet 2, that is, the dynamic magnet 1 is located on the side facing the open end of the static magnet 2. The dynamic magnet 1 and the insulating support 101 are integrally formed by buried mold injection molding. One end of the insulating support 101 is hinged to the shell structure 100 on one side of the static magnet 2. The hinge method can be a general hinge hinge or a ball joint, which is a ball joint in this embodiment. The other end of the insulating support 101 is a free end, which crosses the open end of the static magnet 2 and is located on the other side of the static magnet 2. An extension portion 102 is extended and formed on the end face of the free end of the insulating support 101. The position close to the free end of the insulating support 101 is connected to the shell structure 100 on the other side of the static magnet 2 through a support spring 7, and the back of the insulating support 101 rests on the shell structure 100. In the initial position, an air gap is retained between the static magnet 2 and the dynamic magnet 1 to ensure that under the action of the magnetic field force, the static magnet 2 can attract the dynamic magnet 1 and move the dynamic magnet structure 10 toward the static magnet 2.
[0051] A fixed structure 8 is arranged on the housing structure 100 on one side of the free end of the insulating support 101 and one side of the static magnet 2. The fixed structure 8 has a hollow part and is an inverted convex structure. A guide structure 801 is arranged on the side of the fixed structure 8 facing the insulating support 101. The guide structure 801 has a displacement channel, and the displacement channel is connected to the hollow part of the fixed structure 8. The first static contact piece 5 and the second static contact piece 6 are arranged on the fixed structure 8, one end of the first static contact piece 5 and the second static contact piece 6 are arranged parallel and spaced and fixed on the side of the fixed structure 8 away from the displacement channel, and the other end passes through the hollow part of the fixed structure 8, opens in a trumpet shape and is respectively fixed on the fixed structure 8 on both sides of the displacement channel, so that the first static contact piece 5 and the second static contact piece 6 located in the hollow part of the fixed structure 8 are arranged in an inverted Y-shaped clip-like structure, and the first static contact piece 5 and the second static contact piece 6 arranged in parallel and spaced apart form an insulated contact channel to ensure that the first static contact piece 5 and the second static contact piece 6 are insulated from each other in the initial position and normal working state. The movable contact piece 4 is a conductive flat plate structure, one end of which is located in the displacement channel of the guide structure 801, and the other end protrudes from one end of the guide structure 801 close to the insulating support 101, and a limiting hole 401 is provided on the movable contact piece 4 protruding from the guide structure 801. The first static contact piece 5 and the second static contact piece 6 are arranged with one end of the open trumpet-shaped structure facing the guide structure 801, so that the displacement channel of the guide structure 801 and the contact channel formed between the first static contact piece 5 and the second static contact piece 6 are arranged facing each other, so that when the movable contact piece 4 is driven by the insulating support 101, it can smoothly enter the contact channel and make conductive contact with the first static contact piece 5 and the second static contact piece 6 respectively, so that the first static contact piece 5 and the second static contact piece 6 are conductive. In order to ensure reliable conductive contact between the dynamic contact piece 4 and the first static contact piece 5 and the second static contact piece 6, the distance between the first static contact piece 5 and the second static contact piece 6 at the contact channel is smaller than the thickness of the dynamic contact piece 4, so that after the dynamic contact piece 4 enters the contact channel, the first static contact piece 5 and the second static contact piece 6 can be elastically deformed, so that the dynamic contact piece 4 and the first static contact piece 5 and the second static contact piece 6 can achieve reliable conductive contact.
[0052] In order to facilitate the insertion of the dynamic contact piece 4 and the reliable conductive contact with the first static contact piece 5 and the second static contact piece 6, the distance between the first static contact piece 5 and the second static contact piece 6 close to the dynamic contact piece and the dynamic magnet assembly is greater than the thickness of the dynamic contact piece, such as an open trumpet-shaped structure, so that the dynamic contact piece can enter between the first static contact piece 5 and the second static contact piece 6, and the distance between the other end away from the dynamic contact piece 4 and the dynamic magnet structure 10, such as the contact channel, is less than the thickness of the dynamic contact piece 4 to ensure that the dynamic contact piece can be inserted into the contact channel between the first static contact piece 5 and the second static contact piece 6, and form reliable conductive contact with the first static contact piece 5 and the second static contact piece 6 respectively.
[0053] The moving contact piece 4 is independently arranged relative to the moving magnetic conductor assembly 10. The advantage of the moving contact piece 4 being independently arranged relative to the moving magnetic conductor structure 10 is that the shaking of the moving magnetic conductor assembly due to impact vibration will not directly affect the moving contact piece 4.
[0054] A trigger assembly is formed between the moving contact piece 4, the first static contact piece 5 and the second static contact piece 6. In the initial state and normal working state, the moving contact piece 4, the first static contact piece 5 and the second static contact piece 6 are insulated from each other, and the formed trigger assembly is in a normally open state.
[0055] When the current of the conductive bar 9 of the main circuit exceeds the set threshold, the magnetic field force induced by the static magnet 2 becomes larger, which is sufficient to drive the magnet structure 10 to move toward the static magnet 2. When the dynamic magnet structure 10 moves, the insulating support 101 of the dynamic magnet structure 10 drives the dynamic contact piece 4 to move along the displacement channel of the guide structure 801, enters the contact channel between the first static contact piece 5 and the second static contact piece 6, and makes conductive contact with the first static contact piece 5 and the second static contact piece 6 respectively, so that the first static contact piece 5 and the second static contact piece 6 are turned on, and the trigger component formed between the dynamic contact piece 4, the first static contact piece 5 and the second static contact piece 6 changes from a normally open state to a closed state.
[0056] When the first static contact piece 5 and the second static contact piece 6 are connected in series in the trigger circuit, in the initial state and the normal working state, the trigger circuit is not turned on. Only when the dynamic contact piece 4 is in conductive contact with the first static contact piece 5 and the second static contact piece 6 respectively, and the trigger assembly formed is closed, the trigger circuit is turned on. When the magnetic trigger device is used in the excitation fuse, the trigger circuit is turned on, and a trigger signal is sent to the excitation source. The excitation source acts according to the received trigger signal and releases high-pressure gas as a driving force. When used in an electrical circuit that switches the normally open contact to the normally closed contact due to an external response, when the trigger assembly is closed, the normally open electrical circuit is turned on, realizing the function after the electrical circuit is turned on.
[0057] The limiting spring piece 3 is an elastic member. One end of the limiting spring piece 3 is fixed on the outer shell structure 100, and the other end is inclined and suspended on the side of the unconnected end of the insulating support member 101, and is supported by the extension portion 102 at the end of the insulating support member 101. The free end of the limiting spring piece 3 is located on the displacement path of the insulating support member 101. In the initial position, a limiting hole 301 is provided on the limiting spring piece 3 between the position where the limiting spring piece 3 contacts the insulating support member 101 and the free end of the limiting spring piece 3. The size of the limiting hole 301 is sufficient for the extension portion 102 of the insulating support member 101 to extend into the limiting hole 301. The limiting spring piece 3 is inclined toward the moving magnet structure 10 and the moving contact piece 4, so that when the moving magnet structure 10 is displaced, the insulating support member 101 can contact the limiting spring piece 3 to cause it to undergo elastic deformation. The free end of the limiting spring piece 3 is configured as a bent limiting feature 302 , and the limiting feature 302 is hooked in the limiting hole 401 of the moving contact piece 4 to limit the initial position of the moving contact piece 4 .
[0058] The end surface of the extension portion 102 of the insulating support member 101 is an inclined surface, which contacts with the limiting spring sheet 3 to achieve the supporting contact with the limiting spring sheet.
[0059] When the current of the main circuit conductive bar 9 exceeds the set threshold value, the magnetic field force generated by the static magnet 2 can displace the dynamic magnet structure 10 toward the static magnet 2. When the dynamic magnet structure 10 is displaced, its extension part 102 is displaced in a manner of resisting the limiting spring piece 3, so that the limiting spring piece 3 is displaced in the direction away from the dynamic magnet structure 10 and the dynamic contact piece 4, and elastic deformation occurs. As the dynamic magnet structure 10 is displaced, the limiting spring piece 3 is disengaged from the limiting hole 401 of the dynamic contact piece 4. As the dynamic magnet structure 10 continues to displace, the insulating support 101 pushes the dynamic contact piece 4 to displace in the direction of the first static contact piece 5 and the second static contact piece 6, so that the dynamic contact piece 4 is respectively in conductive contact with the first static contact piece 5 and the second static contact piece 6, thereby conductively connecting the first static contact piece 10 and the second static contact piece 6. 3, and the second static contact piece 6 is pressed back toward the moving magnet structure 10. The extension part 102 of the moving magnet structure 10 is stuck in the limiting hole 301, and the terminal position of the moving magnet structure 10 is limited by the limiting spring piece 3. At this time, the insulating support 101 of the moving magnet structure 10 abuts against the outer side of the moving contact piece 4, ensuring that the moving contact piece 4 maintains conductive contact with the first static contact piece 5 and the second static contact piece 6.
[0060] See also Figure 5 and Figure 6 ,exist Figure 1On the basis of the above, the structure of the dynamic magnet structure 10 is slightly changed, the insulating support members 101 are located at both ends of the dynamic magnet 1, and the support springs 7 are connected to the dynamic magnet 1.
[0061] The limiting spring piece 3 is not provided with a limiting hole 301 and a limiting feature 302 , and the fixing structure 8 is not provided with a guiding structure 801 . The limiting spring piece 3 is tilted against the extension portion 102 of the dynamic magnetic conductive structure 10 .
[0062] The moving contact piece 4 is an inverted L-shaped structure, one end of which is bent and fixedly arranged on the insulating support 101 of the moving magnetic conductor structure 10, and the other end passes through the opening of the conductive structure 8 facing the first static contact piece 5 and the second static contact piece 6 in the open trumpet-shaped structure, and is located in the open trumpet-shaped structure of the first static contact piece 5 and the second static contact piece 6. A limit piece 402 in the shape of an eight is arranged on the moving contact piece 4 located at the open trumpet-shaped structure of the first static contact piece 5 and the second static contact piece 6, and the limit piece 402 is composed of two open wings arranged on opposite sides of the moving contact piece 4, and the two wings form an eight-shaped structure. The wings of the limit piece 402 have a certain elasticity, and the first static contact piece 5 and the second static contact piece 6 are respectively provided with limit holes (501, 601) corresponding to the limit pieces 402, and the limit holes (501, 601) are arranged near the end where the spacing of the trumpet-shaped structure is reduced. When the dynamic magnet structure 10 is driven by the magnetic field force to move toward the static magnet 2, the dynamic magnet structure 10 drives the dynamic contact piece 4 to rotate in the space where the first static contact piece 5 and the second static contact piece 6 are in the open trumpet-shaped structure and insert toward the first static contact piece 5 and the second static contact piece 6. When the dynamic magnet 1 is adsorbed on the static magnet 2, the free end of the dynamic contact piece 4 is inserted into the contact channel between the first static contact piece 5 and the second static contact piece 6 in an interference fit manner, and is in conductive contact with the first static contact piece 5 and the second static contact piece 6 respectively, conductively connecting the first static contact piece 5 and the second static contact piece 6. At this time, during the displacement of the dynamic contact piece 4, the limiting piece 402 on the dynamic contact piece 4 is squeezed by the first static contact piece 5 and the second static contact piece 6 to undergo elastic deformation. When the dynamic contact piece 4 moves to its position, the two wings of the eight-shaped structure of the limiting piece 402 are respectively inserted into the limiting holes (501, 601), thereby limiting the terminal position of the dynamic contact piece 4. The limiting spring piece 3 is elastically deformed by being pressed by the extension part 102 as the moving magnet structure 10 moves. When the extension part 102 of the moving magnet structure 10 passes over the free end of the limiting spring piece 3, the limiting spring piece 3 is pressed back by the elastic force and abuts against the end surface of the insulating support 101 and the outer side of the extension part 102, thereby limiting the terminal position of the moving magnet structure 10. In this embodiment, the moving contact piece 4 is limited in position by the limiting member 402, the moving magnet structure 10 and the limiting spring piece, and its working reliability is higher.
[0063] In the above embodiment, the elastic force direction of the limiting spring is not the same as the elastic force direction of the supporting spring 7 arranged on the dynamic magnetic conductive structure 10, which can effectively improve the impact and vibration resistance of the product.
[0064] In the above embodiment, a relatively sharp blade-shaped edge is provided at one end edge of the moving contact piece that contacts the first static contact piece and the second warp contact piece. When the moving contact piece contacts the first static contact piece and the second warp contact piece, the sharp edge of the moving contact piece will scrape the contact surface of the first static contact piece and the second warp contact piece, remove the oxide film at the contact surface of the first static contact piece and the second warp contact piece, and make the contact more reliable. At the same time, the thickness of one end of the moving contact piece that contacts the first static contact piece and the second warp contact piece is slightly larger than the insulation spacing distance between the first static contact piece and the second warp contact piece (that is, the width of the contact channel between the first contact piece and the second contact piece), so as to ensure that when the moving contact piece contacts the first static contact piece and the second warp contact piece, a certain deformation is formed on the first static contact piece and the second warp contact piece, so as to form a reliable contact.
[0065] The first static contact piece and the second static contact piece in the above-mentioned embodiments have a certain elasticity and are fixed by a fixed structure. For example, a limit groove is provided on the fixed structure, and the first static contact piece and the second static contact piece are installed in the limit groove. When it is applied to the application end, it can also be fixed by the structure of the application end. The first static contact piece and the second static contact piece are fixed to ensure that when the dynamic contact piece contacts them, the elastic deformation of the first static contact piece and the second static contact piece is limited to a certain range, so as to avoid the static contact piece from bouncing or shaking greatly when it is hit by the dynamic contact piece. At the same time, the contact position of the static contact piece and the dynamic contact piece can have a certain plastic deformation, and the contact is more reliable.
[0066] In the above embodiments, the dynamic magnetic conductor assembly, the static magnetic conductor, the first static contact piece, the second contact piece, and the limiting spring piece are respectively arranged on the shell structure. When the magnetic trigger device is applied to an excitation fuse or is applied in an electrical circuit that switches a normally open contact to a normally closed contact due to an external response, the shell structure can be replaced by the structure of the application end. For example, when applied to an excitation fuse, the shell of the excitation fuse and its other components can replace the shell structure. The principle of replacement is to facilitate installation and fixation.
[0067] In the above-mentioned embodiment, one end of the moving magnet assembly is hinged, and the moving magnet assembly is displaced in a rotational manner relative to the static magnet. In other embodiments, the moving magnet assembly is arranged at an interval opposite to the open end of the static magnet, so that the open ends of the moving magnet and the static magnet form a structural form in which they are arranged in parallel and at an interval. Support springs are respectively arranged on both sides of the static magnet, and are fixedly connected to the moving magnet assembly through the support springs to form support for the moving magnet assembly. With such a structural form, the moving magnet is displaced in a translational manner relative to the static magnet. Other structures may remain unchanged.
[0068] In the above embodiment, the first static contact piece and the second static contact piece are used as the trigger component. In other embodiments, only the first static contact piece can be used without the second static contact piece, and the second static contact piece can be replaced by the dynamic contact piece. Since the dynamic contact piece needs to move, the dynamic contact piece is conductively connected with a soft connector, and is connected in series with the first static contact piece in the trigger circuit through the conductive soft connector. When the dynamic magnetic conductive body component is displaced, the dynamic contact piece is driven to conductively contact with the first static contact piece, so that the trigger component can be closed, and the trigger circuit of the series triggering opening can be turned on.
[0069] When the magnetic trigger device 11 is used in the excitation fuse, Figures 1 to 4 The magnetic trigger device of the structure is used as an example, see Figure 7 The excitation fuse includes an excitation source 12, a conductive bar 9 that can be connected in series with the main circuit, a disconnection device 13 corresponding to the conductive bar, and a trigger circuit 14. At both ends of the disconnected area of the conductive bar 9, an arc extinguishing fuse 15 is connected in parallel. The resistance of the fuse 15 is much greater than the resistance of the conductive bar 9. When the current is normally flowing, the current flows through the conductive bar 9, and the current flowing through the fuse 15 can be ignored. The excitation source 12 is a gas generator, which can receive a trigger signal sent by the trigger circuit, such as a voltage signal, to ignite and release high-pressure gas as a driving force. The trigger circuit is connected to the excitation source 12, and a control power supply is connected in series in the trigger circuit. The control power supply is located at the application end of the excitation fuse, that is, outside the excitation fuse. The first static contact piece 5 and the second static contact piece 6 of the magnetic trigger device are respectively connected in series with the trigger circuit located inside the excitation fuse. Since the first static contact piece 5 and the second static contact piece 6 are both in an insulating state in the initial state and the normal working state, the trigger circuit is not conducting in the initial state and the normal working state, and the excitation source 12 does not act. The static magnet 2 is arranged around the conductive row 9 , and the dynamic magnet assembly 1 is hingedly arranged on one side of the static magnet 2 .
[0070] During operation, the conductive bar 9 of the excitation fuse is connected in series in the main circuit. When the current of the main circuit exceeds the set threshold value, the magnetic field force generated on the static magnet 2 is large enough to attract the dynamic magnet 1, and the dynamic magnet structure 10 can be driven to move toward the static magnet 2. During the movement of the dynamic magnet assembly 1 toward the static magnet 2, it always resists the limit spring piece, causing the limit spring piece to elastically deform and generate elastic force, and the limit spring piece 3 is separated from the dynamic contact piece 4. With the further displacement of the dynamic magnet structure 10, the dynamic magnet structure 10 drives the dynamic contact piece 4 to move along the guide structure and respectively make conductive contact with the first static contact piece and the second static contact piece, so that the first static contact piece and the second static contact piece are connected, thereby turning on the trigger circuit, and the trigger circuit sends a trigger signal to the excitation source 12. The excitation source 12 acts to release the driving force, driving the cutting device 13 to move toward the conductive bar 9, cutting off the conductive bar 9, and then the current flows through the arc extinguishing fuse 15, and the fuse 15 is melted or cut off by the cutting device 13, thereby disconnecting the main circuit. When the dynamic magnet structure 10 drives the dynamic contact piece 4 to move along the guide structure and respectively make conductive contact with the first static contact piece and the second static contact piece, the dynamic magnet 1 is adsorbed by the static magnet 2 at the open end of the static magnet 1. At this time, the end of the dynamic magnet structure 10 is just located at the limiting hole on the limiting spring piece 3. Under the elastic force of the limiting spring piece 3, the limiting spring piece 3 is pressed back toward the dynamic magnet structure 10, and the extension part of the end of the dynamic magnet structure 10 is stuck in the limiting hole of the limiting spring piece 3, so as to define the terminal position of the dynamic magnet structure 10. Even if the excitation fuse is subjected to vibration, the terminal position of the dynamic magnet structure 10 remains unchanged, and the dynamic magnet structure 10 always maintains the action of pressing against the dynamic contact piece 4, ensuring that the dynamic contact piece 4 is in conductive contact with the first static contact piece and the second static contact piece, thereby ensuring the contact reliability.
[0071] When the magnetic trigger device is Figure 5 In the structure, the moving contact piece replaces the second static contact piece, and the other structural principles are the same.
[0072] Magnetic trigger devices can also be used in electrical circuits that switch normally open contacts to normally closed contacts in response to external factors.
Claims
1. A magnetic trigger device, characterized in that: It includes a dynamic magnetic structure, a static magnetic structure, a limit spring, and a normally open trigger component, wherein the trigger component includes a dynamic contact piece and a static contact piece; The static magnet is arranged around the main circuit conductive bar, the dynamic magnet structure is displaceably arranged on one side of the static magnet, and the dynamic magnet structure and the static magnet are located on the magnetic field path generated after the conductive bar is energized; in the initial position, an air gap is retained between the dynamic magnet structure and the static magnet; The dynamic contact piece is displaceably located between the dynamic magnetic conductive structure and the static contact piece, and the dynamic contact piece is located on the displacement path of the dynamic magnetic conductive structure; The limiting spring piece is located outside one end of the moving magnetizer close to the moving contact piece, one end of the limiting spring piece is fixed, and the other end is suspended to form a free end, and the suspended limiting spring piece part is located on the displacement path of the moving magnetizer structure; When the current of the main circuit conductive row exceeds a set threshold value, the dynamic magnetic structure is driven by the magnetic field force generated by the static magnetic body to displace toward the static magnetic body; during the displacement of the dynamic magnetic structure, the dynamic magnetic structure drives the dynamic contact piece and the limiting spring piece to displace respectively, so that the dynamic contact piece is in conductive contact with the static contact piece, so that the limiting spring piece limits the terminal position of the dynamic magnetic structure, and the dynamic magnetic structure limits the terminal position of the dynamic contact piece.
2. The magnetic trigger device according to claim 1, characterized in that: The dynamic magnet structure includes a dynamic magnet and an insulating support, wherein the dynamic magnet is arranged on the side surface of the insulating support facing the static magnet; the dynamic contact piece is displaceably located between the insulating support and the static contact piece, and the dynamic contact piece is located on the displacement path of the insulating support; the limiting spring piece is located on the outer side of one end of the insulating support close to the dynamic contact piece, one end of the limiting spring piece is fixedly arranged, and the other end is suspended to form a free end, and the suspended limiting spring piece portion is located on the displacement path of the insulating support.
3. The magnetic trigger device according to claim 2, characterized in that: An extension portion with a protruding end is provided at one end of the insulating support member facing the limiting spring sheet, and the suspended limiting spring sheet portion is located on the displacement path of the extension portion of the insulating support member; when the dynamic magnetic conductive structure is displaced from the initial position to the terminal position, the extension portion of the insulating support member abuts against the limiting spring sheet and displaces toward the free end of the limiting spring sheet; the free end of the limiting spring sheet is located on the displacement path of the insulating support member, and when the dynamic magnetic conductive structure is displaced to the terminal position, the free end of the limiting spring sheet is displaced to the side of the extension portion away from the static contact sheet, and abuts against the side of the extension portion of the insulating support member, thereby limiting the terminal position of the dynamic magnetic conductive structure; or, a limiting hole is provided on the limiting spring sheet, and the limiting hole is located on the displacement path of the extension portion of the insulating support member; when the dynamic magnetic conductive structure is displaced to the terminal position, the extension portion of the insulating support member is inserted into the limiting hole of the limiting spring sheet, thereby limiting the terminal position of the dynamic magnetic conductive structure.
4. The magnetic trigger device according to claim 3, characterized in that: When a limiting hole is provided on the limiting spring sheet, a limiting hole is also provided on the moving contact piece, and the free end of the limiting spring sheet is in a bent structure. In the initial position, the free end of the limiting spring sheet is hooked in the limiting hole of the moving contact piece to limit the initial position of the moving contact piece; as the insulating support member is displaced, the free end of the limiting spring sheet is separated from the contact with the limiting hole of the moving contact piece.
5. The magnetic trigger device according to claim 1, characterized in that: When the static contact piece is a single piece, the dynamic contact piece and the static contact piece can be respectively conductively connected to one end of the circuit, and the dynamic contact piece is connected to the circuit in a software connection manner; a contact channel for the dynamic contact piece to be displaced is provided on one side of the static contact piece, or the static contact piece is bent into a clip-like structure to form a contact channel for the dynamic contact piece to be displaced; the dynamic magnetic conductive structure can drive the dynamic contact piece to be displaced along the contact channel and conductively contact the static contact piece.
6. The magnetic trigger device according to any one of claims 1 to 4, characterized in that: When the static contact piece is two pieces, the static contact piece includes a first static contact piece and a second static contact piece which are insulated from each other, and the first static contact piece and the second static contact piece can be respectively conductively connected to one end of the circuit; the first static contact piece and the second static contact piece are arranged in an inverted Y-shaped clip shape, and the first static contact piece and the second static contact piece are in an open trumpet-shaped structure facing one end of the dynamic magnetic conductor, and the other end is an insulating contact channel arranged in parallel and spaced apart; the dynamic contact piece is located between one end of the open trumpet-shaped structure of the first static contact piece and the second static contact piece and the insulating support member; when the insulating support member drives the dynamic contact piece to move, the dynamic contact piece passes through the trumpet-shaped structure and enters the contact channel, and is in conductive contact with the first static contact piece and the second static contact piece, so that the first static contact piece and the second static contact piece are conductive.
7. The magnetic trigger device according to claim 6, characterized in that: An insulating guide structure is arranged between one end of the first static contact piece and the second static contact piece in an open trumpet-shaped structure and the dynamic magnetic conductive structure; the dynamic contact piece is a flat plate structure, one end of which is located in the guide structure, and the other end is located between the guide structure and the dynamic magnetic conductive structure; when the dynamic magnetic conductive structure drives the dynamic contact piece to displace, the dynamic contact piece displaces along the guide structure and is inserted into the contact channel between the first static contact piece and the second static contact piece.
8. The magnetic trigger device according to claim 6, characterized in that: When the free end of the limiting spring piece is located on the displacement path of the dynamic magnetic conductive structure, one end of the dynamic contact piece away from the first static contact piece and the second static contact piece is fixed on the dynamic magnetic conductive structure, and the other end of the dynamic contact piece is suspended in one end of the open trumpet-shaped structure of the first static contact piece and the second static contact piece; with the displacement of the dynamic magnetic conductive structure, the dynamic contact piece is displaced along one end of the open trumpet-shaped structure of the first static contact piece and the second static contact piece, and is inserted into the contact channel between the first static contact piece and the second static contact piece, so that the first static contact piece and the second static contact piece are in conductive contact.
9. The magnetic trigger device according to claim 8, characterized in that: Wings are arranged on opposite sides of the outer periphery of the dynamic contact piece, and one end of the two wings away from the insulating support is fixed on the dynamic contact piece, and the other end is suspended toward the dynamic magnetic conductive structure, so that the two wings are in an eight-shaped structure; limiting holes are respectively opened on the first static contact piece and the second static contact piece at the narrowed end close to the trumpet-shaped structure corresponding to the wings, and when the dynamic contact piece moves to the end position, the two wings are respectively clamped in the limiting holes on the first static contact piece and the second static contact piece.
10. The magnetic trigger device according to any one of claims 1 to 4, characterized in that: The edge of one end of the moving contact piece that can contact the static contact piece is set to a sharp blade-like structure. When the moving contact piece and the static contact piece are in conductive contact, the edge of the blade-like structure of the moving contact piece contacts the surface of the static contact piece, and the oxide film on the contact surface of the static contact piece can be scraped and removed.
11. The magnetic trigger device according to claim 1, characterized in that: The static magnet is a semi-enclosed structure, and the main circuit conductive row can be inserted into the groove formed by the semi-enclosed structure of the static magnet; the dynamic magnet structure is located on the side facing the open end of the static magnet; one end of the dynamic magnet structure is hinged on the side of the static magnet, and the other end of the dynamic magnet structure is a free end, and one end of the dynamic magnet structure facing the limit spring sheet crosses the open end of the static magnet and is located on the other side of the static magnet; the limit spring sheet, and the trigger assembly formed by the dynamic contact sheet and the static contact sheet are respectively located on the side of the static magnet where the dynamic magnet structure is located where the limit spring sheet is located; a support spring is fixedly arranged on the side of the static magnet where the dynamic contact sheet is located, and the support spring is connected to the dynamic magnet structure, and the extension direction of the support spring is the same as the displacement direction of the dynamic magnet structure; the dynamic contact sheet is located on the displacement path of the dynamic magnet structure; when the dynamic magnet structure rotates and displaces relative to the static magnet, the dynamic magnet structure drives the dynamic contact sheet to displace.
12. The magnetic trigger device according to claim 2, characterized in that: The static magnet is a semi-enclosed structure, and the main circuit conductive bar can be inserted into the groove formed by the semi-enclosed structure of the static magnet; the dynamic magnet structure is located on the side opposite to the open end of the static magnet, and is arranged parallel to the open end of the static magnet; both ends of the insulating support are free ends, and are respectively located on both sides of the static magnet, and the support springs located on both sides of the static magnet are respectively connected to the dynamic magnet structure to form support for the dynamic magnet structure; the dynamic contact piece is located on the displacement path of the dynamic magnet structure; when the dynamic magnet structure is displaced toward the static magnet in a translational manner, the dynamic magnet structure drives the dynamic contact piece to displace.
13. The magnetic trigger device according to claim 1, characterized in that: It also includes a shell structure, in which the dynamic magnetic conductor structure, the static magnetic conductor, the limit spring, the dynamic contact piece, and the static contact piece are respectively integrated.
14. The magnetic trigger device according to claim 1, characterized in that: An insulating layer is arranged between the static magnetic conductor and the surrounding main circuit conductive bar.
15. An excitation fuse, characterized in that: It comprises an excitation source, a conductive bar which can be connected in series with a main circuit, a cut-off device arranged corresponding to the conductive bar, and a trigger circuit; the trigger circuit is connected to the signal receiving end of the excitation source to provide a self-excitation trigger signal therefor; a magnetic trigger device according to any one of claims 1 to 14 is arranged on the conductive bar, the magnetic trigger device is connected in series with the trigger circuit, and the series connection method includes: when the static contact piece of the magnetic trigger device is one piece, the dynamic contact piece and the static contact piece of the magnetic trigger device are respectively conductively connected to the trigger circuit, and in the initial position, the dynamic contact piece and the static contact piece are insulated, and the trigger circuit is in a non-conductive state; when the static contact piece comprises a first static contact piece and a second static contact piece, the first static contact piece and the second static contact piece are respectively connected in series with the trigger circuit, and in the initial position, the dynamic contact piece, the first static contact piece, and the second static contact piece are insulated from each other, and the trigger circuit is in a non-conductive state; When the current of the conductive bus exceeds a set threshold, the magnetic trigger device is actuated, the movable contact piece is in conductive contact with the static contact piece, and when the static contact piece includes a first static contact piece and a second static contact piece, the movable contact piece is in conductive contact with the first static contact piece and the second static contact piece, respectively, thereby turning on the trigger circuit, and the trigger circuit sends a self-excitation trigger signal to the excitation source. The excitation source is actuated according to the received trigger signal, and releases high-pressure gas as a driving force, driving the cutting device to move, cutting off the conductive bus, and thus disconnecting the main circuit.