Magnetic trigger device and excitation fuse

Abstract

The invention relates to the field of circuits, in particular to a magnetic triggering device and an excitation fuse, and the magnetic triggering device comprises a driving magnetic tripping device, a limiting magnetic tripping device, and a movable contact piece and a static contact piece which can be connected into a circuit; the driving magnetic tripping device can drive the movable contact piece to displace to be in conductive contact with the static contact piece, and at the initial position, the limiting magnetic tripping device limits the displacement of the movable contact piece; when the current on the conducting bar of the main circuit exceeds a set threshold value, the limiting magnetic tripping device acts to release the displacement limitation of the movable contact piece, and then the driving magnetic tripping device drives the movable contact piece to displace to be in conductive contact with the static contact piece. When the magnetic trigger device is applied to the excitation fuse, the trigger circuit of the excitation fuse is controlled by the magnetic trigger device to send a trigger signal to the excitation source. Through the driving magnetic tripping device and the limiting magnetic tripping device, the anti-seismic performance of the magnetic triggering device is improved, and the working reliability of the magnetic triggering device and the excitation fuse is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of circuit protection, in particular to the field of electric vehicles and other power control, especially to the magnetic trigger device and incentive fuse for changing the state of the circuit in the field of new energy direct power distribution. BACKGROUND

[0002] The existing incentive fuse, especially the one applied in the field of electric vehicles and other new energy, mainly takes active protection as the main part, that is, when the control system (BMS) detects that the main circuit occurs abnormal working conditions such as short circuit and needs to cut off the circuit, the control system needs to provide a trigger signal to the trigger device of the incentive fuse, and the incentive fuse can cut off the circuit. That is to say, the incentive fuse belongs to the execution element, and its protection function is completely dependent on the control system, and it cannot cut off the circuit by itself through sensing the large current; based on this, an active intelligent incentive fuse with a magnetic trigger module is developed, which increases the passive protection function on the basis of the original incentive fuse that can accept active control of the system, and the basic principle is to increase a set of external power supply, which is connected to the trigger interface of the incentive fuse through a normally open contact; at the same time, a magnetic trigger device is arranged on the main circuit of the incentive fuse, referring to a kind of active and passive integrated protection device disclosed in Chinese patent application 2023224539282. After the current of the main circuit reaches the expected value, the movement of the moving armature makes the normally open contact arranged in the circuit close, so as to connect the passive trigger circuit of the incentive fuse, and the incentive fuse is triggered to act, thereby realizing the passive protection function. In this scheme, the contact reliability of the normally open contact is very important, and the use of lap type contact or micro switch will have the phenomenon of contact bounce or unreliable contact during contact, thereby causing the passive protection of the incentive fuse to delay, and even the protection cut-off fails. In addition, the conventional contact has poor anti-shock performance, and there may be false touch phenomenon. SUMMARY

[0003] The purpose of the present application is to provide a magnetic trigger device and an incentive fuse, which improves the anti-vibration performance by setting a set of driving magnetic release devices and limiting magnetic release devices to cooperate, avoids the occurrence of false action caused by vibration, and improves the working safety and reliability.

[0004] To achieve the above purpose, the technical scheme provided by the present application is a magnetic trigger device, which comprises a driving magnetic release device, a limiting magnetic release device, a movable contact piece and a static contact piece which can be connected to a circuit;

[0005] In the initial position, the movable contact piece and the static contact piece are insulated and spaced apart;

[0006] The driving magnetic release device and the limiting magnetic release device are respectively arranged in the magnetic field of the main circuit conductive row;

[0007] The driving magnetic tripping device can drive the moving contact piece to displace and conductively contact the static contact piece. In the initial position, the limiting magnetic tripping device limits the displacement of the moving contact piece.

[0008] When the current on the conductive row of the main circuit exceeds the set threshold, the limiting magnetic tripping device and the driving magnetic tripping device are tripped respectively. After the limiting magnetic tripping device is tripped to release the limitation on the displacement of the moving contact piece, the driving magnetic tripping device drives the moving contact piece to displace and conductively contact the static contact piece.

[0009] Preferably, the driving magnetic tripping device and the limiting magnetic tripping device are located in the same magnetic circuit or different magnetic circuits.

[0010] Preferably, when the driving magnetic tripping device and the limiting magnetic tripping device are located in the same magnetic circuit, the driving magnetic tripping device and the limiting magnetic tripping device share the static magnetic conductor.

[0011] Preferably, the driving magnetic tripping device comprises a driving moving magnetic conductor, a limiting moving magnetic conductor, the static magnetic conductor, and a first limiting device. The driving moving magnetic conductor and the static magnetic conductor form the driving magnetic tripping device. The limiting moving magnetic conductor, the static magnetic conductor, and the first limiting device form the limiting magnetic tripping device. The static magnetic conductor is arranged around the conductive row of the main circuit. The driving moving magnetic conductor structure is located at the opening end of the static magnetic conductor, and a movement air gap is reserved between the driving moving magnetic conductor structure and the static magnetic conductor. The limiting moving magnetic conductor is located on the side adjacent to the opening end of the static magnetic conductor, and a movement air gap is reserved between the limiting moving magnetic conductor and the static magnetic conductor. The first limiting device is located on the static magnetic conductor and on the displacement path of the moving contact piece to limit the moving contact piece. The limiting moving magnetic conductor is linked with the first limiting device. When the limiting moving magnetic conductor displaces towards the static magnetic conductor, the first limiting device can displace relative to the moving contact piece to release the limitation on the moving contact piece.

[0012] Preferably, the side of the static magnetic conductor provided with the limiting moving magnetic conductor is provided with a fracture to divide the side of the static magnetic conductor into two independent parts to form a set of static magnetic conductors. A supporting spring for supporting the limiting moving magnetic conductor is arranged at the fracture. The first limiting device is arranged on the side of the static magnetic conductor where the limiting moving magnetic conductor is located.

[0013] Preferably, when the driving magnetic tripping device and the limiting magnetic tripping device are located in different magnetic circuits, the driving magnetic tripping device comprises a driving dynamic magnetic conductor structure and a driving static magnetic conductor, the limiting magnetic tripping device comprises a limiting static magnetic conductor, a limiting dynamic magnetic conductor and a first limiting device; the driving static magnetic conductor and the limiting static magnetic conductor are respectively arranged around the conductive row of the main circuit, the driving dynamic magnetic conductor structure and the limiting dynamic magnetic conductor are respectively located at the opening end of the driving static magnetic conductor and the limiting static magnetic conductor corresponding thereto, and a movement air gap is respectively reserved between the driving static magnetic conductor and the limiting static magnetic conductor corresponding thereto; the driving dynamic magnetic conductor structure and the limiting dynamic magnetic conductor are respectively located at the two sides adjacent to the conductive row; the first limiting device is located on the limiting static magnetic conductor and on the displacement path of the dynamic contact piece, the limiting dynamic magnetic conductor is linked with the first limiting device, when the limiting dynamic magnetic conductor is displaced towards the limiting static magnetic conductor, the first limiting device can be displaced relative to the dynamic contact piece, and the limiting of the dynamic contact piece is released.

[0014] Preferably, the first limiting device comprises a supporting frame and a limiting lever, the limiting lever is movably arranged in the supporting frame; the limiting dynamic magnetic conductor passes through the limiting lever and is linked with the limiting lever; in the initial position, the limiting lever is located on the displacement path of the dynamic contact piece, when the limiting dynamic magnetic conductor is displaced to trip the limiting magnetic tripping device, the limiting lever is displaced towards the direction away from the dynamic contact piece, and the limiting of the dynamic contact piece is released.

[0015] Preferably, when the driving dynamic magnetic conductor and the limiting dynamic magnetic conductor share the static magnetic conductor, the supporting frame is provided with a mounting protrusion on the side towards the driving dynamic magnetic conductor structure, one end of the supporting spring supporting the driving dynamic magnetic conductor structure is sleeved on the mounting protrusion, and the other end is fixedly connected to the driving dynamic magnetic conductor structure.

[0016] Preferably, a limiting spring is arranged on one side of the driving dynamic magnetic conductor structure, one end of the limiting spring is fixedly arranged, and the other end is suspended; the suspended end of the limiting spring is bent towards the driving dynamic magnetic conductor structure to form a bent limiting end; in the initial position, the bent limiting end is located between the driving dynamic magnetic conductor structure and the dynamic contact piece, and is located on the displacement path of the driving dynamic magnetic conductor structure; when the driving dynamic magnetic conductor structure is displaced, the bent limiting end of the limiting spring blocks the driving dynamic magnetic conductor structure; when the driving dynamic magnetic conductor structure is displaced to the terminal position, the bent limiting end of the limiting spring is located on the side of the driving dynamic magnetic conductor structure away from the dynamic contact piece, and the terminal position of the driving dynamic magnetic conductor structure is limited.

[0017] Preferably, a protruding block with protruding side surface is arranged on the side surface of the driving moving magnet structure facing the limiting elastic sheet, and a gap is formed between the side surface of the driving moving magnet structure and the side of the protruding block away from the moving contact sheet, and the bent limiting end of the limiting elastic sheet abuts against the gap when the driving moving magnet structure is displaced to the terminal position.

[0018] The application also provides an energizing fuse, which comprises a shell, a conductive row arranged in the shell, and two ends of the conductive row located outside the shell; an energizing source and a piston arranged in the shell, the piston corresponding to the conductive row, and a signal receiving end of the energizing source connected with a trigger circuit respectively; the magnetic trigger device is arranged on the conductive row, and the moving contact sheet and the static contact sheet are connected in series with the trigger circuit respectively; in the initial position, the moving contact sheet and the static contact sheet are arranged in an insulated manner, so that the trigger circuit is in a non-conduction state; when the magnetic trigger device acts, the moving contact sheet and the static contact sheet are driven to conductive contact, the trigger circuit is conducted, the trigger circuit sends a trigger signal to the energizing source, and the energizing source acts to release high-pressure gas as driving force to drive the piston to displace and disconnect the conductive row.

[0019] Preferably, the magnetic trigger device is integrated outside the energizing fuse or in the shell of the energizing fuse. The magnetic trigger device of the application adopts the cooperation of the driving magnetic tripping device and the limiting magnetic tripping device, and the displacement of the moving contact sheet and the driving magnetic tripping device is limited by the limiting magnetic tripping device, so that the anti-vibration performance of the magnetic trigger device can be improved, the energizing fuse can be prevented from malfunctioning due to vibration when used in the energizing fuse, and the working reliability is improved.

[0020] The driving magnetic tripping device and the limiting magnetic tripping device are arranged in different directions of the conductive row, so that the anti-vibration performance can be improved.

[0021] The driving magnetic tripping device and the limiting magnetic tripping device share a static magnet, so that the structure is more compact and the volume is smaller. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a front view structural schematic diagram of the driving magnetic tripping device and the limiting magnetic tripping device located in the same magnetic circuit and in the initial position.

[0023] Figure 2 is Figure 1 a top view structural schematic diagram of the driving magnetic tripping device and the limiting magnetic tripping device.

[0024] Figure 3 is a front view structural schematic diagram of the driving magnetic tripping device and the limiting magnetic tripping device in the terminal position.

[0025] Figure 4 is Figure 3is a top structure schematic diagram of the magnetic trigger device.

[0026] Figure 5 is a structure position schematic diagram between the limiting magnetic tripping device and the moving contact piece and the static contact piece.

[0027] Figure 6 is a front structure position schematic diagram between the limiting magnetic tripping device and the moving contact piece and the static contact piece.

[0028] Figure 7 is Figure 6 A-A sectional view of the magnetic trigger device.

[0029] Figure 8 is a structure schematic diagram of the driving magnetic tripping device and the limiting magnetic tripping device in different magnetic circuits.

[0030] Reference signs:

[0031] Driving moving magnetic conductor structure 100, driving static magnetic conductor 101, conductive row 102, insulating support 104, driving moving magnetic conductor 105, first support spring 106, moving contact piece 107, static contact piece 108, limiting moving magnetic conductor 109, second support spring 110, support frame 111, limiting push rod 112, limiting elastic sheet 113, bent limiting end 114, protrusion 115, limiting static magnetic conductor 116. DETAILED DESCRIPTION

[0032] The magnetic trigger device of the present application comprises a driving magnetic tripping device, a limiting magnetic tripping device, a moving contact piece and a static contact piece which can be connected to a circuit; in the initial position, the moving contact piece and the static contact piece are insulated and spaced apart; the driving magnetic tripping device and the limiting magnetic tripping device are respectively arranged in the magnetic field of the conductive row of the main circuit; the driving magnetic tripping device can drive the displacement of the moving contact piece and the conductive contact of the static contact piece; in the initial position, the limiting magnetic tripping device limits the displacement of the moving contact piece.

[0033] When the current on the conductive row of the main circuit exceeds the set threshold value, the limiting magnetic tripping device and the driving magnetic tripping device act respectively; after the limiting magnetic tripping device acts to remove the limitation on the displacement of the moving contact piece, the driving magnetic tripping device drives the displacement of the moving contact piece and the conductive contact of the static contact piece.

[0034] The driving magnetic tripping device and the limiting magnetic tripping device are in the same magnetic circuit or in different magnetic circuits.

[0035] The preferred embodiments will be described in detail below with reference to the drawings. The orientation words involved only refer to the orientation shown in the drawings and do not constitute a limitation on the technical solutions of the present application.

[0036] Referring to Figures 1 to 7The magnetic trigger device of the present application comprises a shell (not shown), a driving magnetic tripping device, a limiting magnetic tripping device, and a normally open trigger assembly, wherein the driving magnetic tripping device and the limiting magnetic tripping device are located in the same magnetic circuit.

[0037] The driving magnetic tripping device comprises a driving dynamic magnetic structure 100 and a driving static magnetic body 101, the driving static magnetic body 101 is arranged around the conductive row 102 of the main circuit, the driving dynamic magnetic structure 100 is arranged on one side of the driving static magnetic body 100 in a displaceable manner, and the driving dynamic magnetic structure 100 and the driving static magnetic body 101 are located in the magnetic field path generated after the conductive row 102 is electrified; in the initial position, an air gap is reserved between the driving dynamic magnetic structure 100 and the driving static magnetic body 101.

[0038] The driving static magnetic body 101 is in the shape of U or C, and an insulating layer (not shown) is arranged between the driving static magnetic body 101 and the conductive row 102.

[0039] The driving dynamic magnetic structure 100 is arranged on one side of the opening end of the driving static magnetic body 101, one end of the driving dynamic magnetic structure 100 is hingedly connected to the shell, and the other end of the driving dynamic magnetic structure 100 is arranged in a suspended manner; when the magnetic field generated by the current on the conductive row can drive the driving dynamic magnetic structure 100 to displace by the suction force generated by the driving static magnetic body 101, the driving dynamic magnetic structure 100 is displaced towards the driving static magnetic body 101.

[0040] The driving dynamic magnetic structure 100 comprises an insulating support 104 and a driving dynamic magnetic body 105, the driving dynamic magnetic body 105 is fixedly arranged on one side of the insulating support 104 facing the static magnetic body 101, one end of the insulating support 104 is hingedly connected to the shell, and the other end of the insulating support 104 is arranged in a suspended manner, and the two ends of the insulating support 104 are respectively located on the two outer sides of the opening end of the static magnetic body 101. The suspended end of the insulating support 104 is supported by a first supporting spring 106, one end of the first supporting spring 106 is connected to the insulating support 104, and the other end of the first supporting spring 106 is arranged on the shell.

[0041] A group of dynamic contact pieces 107 and static contact pieces 108 are arranged on one side of the static magnetic body 101, and in the initial state, the dynamic contact pieces 107 and the static contact pieces 108 are kept in an insulating and non-contact state. In actual application, the dynamic contact pieces 107 and the static contact pieces 108 can be used as a group of switch structures and are connected in a circuit that needs to be normally open; only when the driving magnetic tripping device is actuated, the dynamic contact pieces 107 and the static contact pieces 108 can be in contact and conductive, so that the circuit connected therewith is also conductive, thereby realizing the function of the circuit.

[0042] The static contact piece 108 is fixedly arranged on the shell, and in the example, the static contact piece 108 has a clip structure. The dynamic contact piece 107 is arranged in a displacement path of a suspended end of the insulating support 104 of the driving dynamic magnet structure 100, and when the driving dynamic magnet structure 100 is displaced towards the static magnet 101, the dynamic contact piece 107 can be driven to displace and be in conductive contact with the static contact piece 108, so that the dynamic contact piece 107 and the static contact piece 108 are conductive. One side of the dynamic contact piece 107 is located outside one side of the static contact piece 108, that is, the width of the dynamic contact piece 107 is greater than the width of the static contact piece 108.

[0043] The position of the dynamic contact piece 107 is achieved as follows: the dynamic contact piece 107 can be arranged in a displacement channel opposite to the opening end of the clip structure of the static contact piece 108, or the dynamic contact piece 107 can be fixedly arranged on one side of the suspended end of the insulating support; or the dynamic contact piece can be fixedly arranged on one end of the shell and suspended on the other end.

[0044] The limiting magnetic tripping device includes a limiting dynamic magnet 109, a second supporting spring 110, and a first limiting device. The limiting dynamic magnet 109 is arranged on one side adjacent to the opening end of the driving static magnet 101, and the limiting dynamic magnet 109 is located in a magnetic field generated by the current of the conductive row. An air gap is reserved between the limiting dynamic magnet 109 and the driving static magnet, and the displacement path of the limiting dynamic magnet 109 is approximately perpendicular to the displacement path of the driving dynamic magnet. The vibration is generally in one direction, and the purpose of the arrangement is that when the magnetic triggering device is subjected to vibration, only one of the driving dynamic magnet and the limiting dynamic magnet is probably affected by the vibration, and the other one is not affected by the vibration, thereby improving the safety and reliability of the magnetic triggering device.

[0045] A breakage is arranged at the position of the driving static magnet where the limiting dynamic magnet 109 is arranged, the driving static magnet is divided into two independent parts by the breakage, the two independent parts of the driving static magnet form a group of driving static magnets, the second supporting spring 110 is supported in the breakage, one end of the second supporting spring 110 is fixedly arranged on the insulating layer between the driving static magnet and the conductive row, the other end of the second supporting spring 110 is fixedly connected to one end of the limiting dynamic magnet, and a movement air gap is formed at the breakage between the limiting dynamic magnet and the driving static magnet. The adjacent two sides of the group of driving static magnets respectively drive the dynamic magnet structure and the limiting dynamic magnet, so that the driving magnetic tripping device and the limiting magnetic tripping device are located in the same magnetic loop.

[0046] In the above embodiments, the shape of the limiting moving magnetic conductor can be set to match the shape of the air gap reserved on the static magnetic conductor for limiting magnetic tripping, or can only cover the surface of the air gap reserved on the static magnetic conductor for limiting magnetic tripping; the limiting moving magnetic conductor can be embedded in the gap between the two parts of the static magnetic conductor for forming the limiting magnetic tripping air gap, or a part of the limiting moving magnetic conductor can be embedded in the groove on the surface of the two parts of the static magnetic conductor for forming the limiting magnetic tripping air gap.

[0047] The first limiting device is located in the displacement path of the moving contact piece and on one side of the static contact piece 108, and is used to block the displacement of the moving contact piece and the conductive contact of the static contact piece. The first limiting device includes a support frame 111 and a limiting lever 112. The support frame 111 is fixedly arranged on the driving static magnetic conductor. The limiting lever 112 is movably arranged in the support frame 111, and the support frame 111 limits the position of the limiting lever to prevent the limiting lever from shaking and ensure that the limiting lever moves linearly. A groove is formed in the limiting lever 112, and one end of the limiting moving magnetic conductor, which is not connected to the second supporting spring 110, passes through the support frame 111 and then passes through the groove of the limiting lever 112. A movement gap is reserved between the groove of the limiting lever 112 and the end of the limiting moving magnetic conductor, and a movement space for the limiting moving magnetic conductor is arranged on the support frame 111. Under the driving of the limiting moving magnetic conductor, the limiting lever can be displaced relative to the support frame to block the displacement of the moving contact piece or to release the blocking of the moving contact piece. In the initial position, under the supporting action of the second supporting spring, the limiting moving magnetic conductor is arranged in an inclined manner, a movement air gap is reserved between the limiting moving magnetic conductor and the driving static magnetic conductor, the limiting moving magnetic conductor supports the limiting lever to rise, and the limiting lever is located on one side of the displacement direction of the moving contact piece and in contact with the side surface of the moving contact piece, thereby blocking the displacement of the moving contact piece toward the static contact piece, so that the moving contact piece cannot contact the static contact piece. When the current exceeds the set threshold value, the magnetic field force generated by the driving static magnetic conductor can attract the limiting moving magnetic conductor to displace toward the driving static magnetic conductor. A mounting protrusion is arranged on the side surface of the support frame 111 toward the driving moving magnetic conductor, and one end of the first supporting spring is sleeved on the outer periphery of the mounting protrusion.

[0048] The air gap between the limiting moving magnetic conductor and the driving static magnetic conductor is smaller than the movement air gap between the driving moving magnetic conductor and the driving static magnetic conductor. When the magnetic field force generated by the driving static magnetic conductor acts on the structure of the limiting moving magnetic conductor and the driving moving magnetic conductor to displace, the magnetic field force for displacing the limiting moving magnetic conductor is smaller than the magnetic field force for displacing the driving moving magnetic conductor. The magnetic field force for displacing the limiting moving magnetic conductor can be smaller than the magnetic field force for displacing the driving moving magnetic conductor by adjusting the movement air gap, adjusting the elastic force of the supporting spring, adjusting the material and weight of the moving magnetic conductor, or a combination of two or more of the above.

[0049] In some embodiments, a limiting elastic sheet 113 can also be arranged on one side of the suspended end of the driving moving magnet. One end of the limiting elastic sheet 113 is fixed on the shell, and the other end is arranged in suspension. The end of the limiting elastic sheet 113 arranged in suspension is bent towards the side of the driving moving magnet to form a bent limiting end 114, which is located on the displacement path of the driving moving magnet structure. When the driving moving magnet structure is displaced, the bent limiting end of the limiting elastic sheet will block the displacement of the driving moving magnet. When the driving moving magnet moves to the side of the bent limiting end of the limiting elastic sheet, the side of the bent limiting end of the limiting elastic sheet abuts against the side of the driving moving magnet away from the moving contact sheet, thereby limiting the terminal position of the driving moving magnet. That is, the limiting elastic sheet 113 blocks the displacement of the driving moving magnet when it is displaced, and limits the terminal position when it is displaced to the terminal position, thereby achieving double limiting. In order to improve the limiting reliability of the terminal position, a protrusion 115 is arranged on the side of the end of the suspended end of the insulating support towards the limiting elastic sheet, and a gap is formed between the protrusion 115 and the side of the end of the suspended end of the insulating support away from the moving contact sheet. When the terminal position is reached, the bent limiting end of the limiting elastic sheet is clamped in the gap, thereby limiting the driving moving magnet.

[0050] Working principle:

[0051] Under normal circumstances, the conductive row flows, and the magnetic attraction generated by the driving stationary magnet is relatively small, so the limiting moving magnet does not act.

[0052] When the current exceeds the set threshold, the magnetic field force generated by the driving stationary magnet first drives the limiting moving magnet to displace, the limiting moving magnet drives the limiting lever to displace towards the driving stationary magnet, thereby releasing the limiting of the moving contact sheet. In this process, the second supporting spring is compressed, the driving moving magnet contacts the moving contact sheet and applies a driving force to the moving contact sheet. Since the moving contact sheet is blocked by the limiting lever before the limiting is released, the driving moving magnet temporarily stops displacing; then the magnetic field force generated by the driving stationary magnet drives the driving moving magnet structure to displace. In the process of displacement, the limiting elastic sheet blocks the displacement of the moving magnet structure. As the driving moving magnet structure displaces, the limiting elastic sheet elastically deforms until the driving moving magnet structure passes the bent limiting end of the limiting elastic sheet. Then the driving moving contact sheet is displaced to insert into the clip-shaped structure of the stationary contact sheet, so that the moving contact sheet and the stationary contact sheet are in conductive contact, and the circuit connected by the moving contact sheet and the stationary contact sheet is turned on. After the driving moving magnet structure passes the bent limiting end of the limiting elastic sheet, the limiting elastic sheet restores its original shape under the action of the elastic force, abuts against the protrusion side surface in the gap on the side of the protrusion of the suspended end of the driving moving magnet structure, thereby limiting the terminal position of the driving moving magnet structure.

[0053] In other embodiments, the driving static guide magnet can be arranged in a groove at the fracture, and the limit static guide magnet is arranged in the groove.

[0054] In the above embodiments, the driving magnetic tripping device and the limit magnetic tripping device share the driving static guide magnet, so that the driving magnetic tripping device and the limit magnetic tripping device are located in the same magnetic circuit, so that the magnetic trigger device is more compact in structure and smaller in size. In other embodiments, the driving magnetic tripping device and the limit magnetic tripping device can also not share the driving static guide magnet, and each uses a corresponding static guide magnet, so that the driving magnetic tripping device and the limit magnetic tripping device are located in different magnetic circuits. Referring to Figure 8 The driving static guide magnet 101 and the limit static guide magnet 116 are arranged around the conductive row 102 of the main circuit, and the driving static guide magnet 101 and the limit static guide magnet 116 are both U-shaped or C-shaped structures. The driving dynamic guide magnet structure 100 and the limit dynamic guide magnet 109 are respectively arranged at the opening end of the corresponding driving static guide magnet 101 and limit static guide magnet 116. The opening end of the driving static guide magnet 101 and the limit static guide magnet 116 is respectively located on the two adjacent sides of the conductive row 102. The driving dynamic guide magnet structure 100 and the limit dynamic guide magnet 109 are respectively arranged outside the two adjacent sides of the conductive row 102, and one end is hingedly fixed. The first limiting device is arranged on the limit dynamic guide magnet 109, and one side of the dynamic contact piece extends above the limit static guide magnet 116 to facilitate the first limiting device to limit the dynamic contact piece. When the first limiting device is arranged on the limit dynamic guide magnet 109, the first limiting device is a limit lever 112. The first limiting device can also be arranged on the limit static guide magnet or the driving static guide magnet. One side of the limit dynamic guide magnet extends above the driving static guide magnet and contacts the limit lever of the first limiting device.

[0055] When the above magnetic trigger device is applied in an excitation fuse, the conductive row 102 is the conductive row of the excitation fuse. The magnetic trigger device can be integrated outside the excitation fuse shell or inside the excitation fuse shell. When integrated inside the excitation fuse shell, it needs to be isolated from the excitation source and the piston to avoid the influence of the generated magnetic field force on the electric arc. When integrated outside the excitation fuse, one end of the conductive row of the excitation fuse outside the shell is extended to facilitate the arrangement of the magnetic trigger device.

[0056] The structure of the energized fuse generally comprises a shell, a conductive plate arranged in the shell, an energizing source and a piston arranged on one side of the conductive plate, and the piston is arranged corresponding to the conductive plate. The energizing source is generally a gas generating device. When the energizing source receives a trigger signal sent by a trigger circuit, it can act to release high-pressure gas as a driving force to drive the piston to displace and cut off the conductive plate. In order to improve the arc extinguishing ability of the energized fuse, an arc extinguishing fuse body is connected in parallel on the conductive plate. When the conductive plate is cut off, the current flows through the parallel fuse, and the parallel fuse is fused or mechanically disconnected by the piston. The resistance of the parallel fuse is much larger than that of the conductive plate. During normal conduction, almost all the current flows through the conductive plate, and the current flowing through the parallel fuse can be ignored.

[0057] The static contact piece and the dynamic contact piece are respectively connected in series in the trigger circuit connected with the energizing source as a switch structure. When the current flowing through the conductive plate exceeds a set threshold, the magnetic trigger device acts to make the dynamic contact piece and the static contact piece conductive contact, so that the trigger circuit is turned on, a trigger signal is sent to the energizing source, the energizing source acts, and thus the energized fuse acts to cut off the main circuit and realize circuit protection.

Claims

1. A magnetic triggering device, characterized in that, Includes a drive magnetic trip device, a limit magnetic trip device, and moving and stationary contact pieces that can be connected to the circuit; In the initial position, the moving contact piece and the stationary contact piece are provided with insulation between them; The driving magnetic tripping device and the limiting magnetic tripping device are respectively set in the magnetic field of the main circuit busbar; The driving magnetic release device can drive the moving contact piece to make conductive contact with the stationary contact piece. In the initial position, the limiting magnetic release device restricts the displacement of the moving contact piece. When the current on the main circuit busbar exceeds a set threshold, the limiting magnetic tripping device and the driving magnetic tripping device trip respectively. After the limiting magnetic tripping device releases the displacement limitation on the moving contact piece, the driving magnetic tripping device drives the moving contact piece to make conductive contact with the stationary contact piece.

2. The magnetic triggering device according to claim 1, characterized in that, The driving magnetic release device and the limiting magnetic release device are located in the same magnetic circuit or in different magnetic circuits.

3. The magnetic triggering device according to claim 2, characterized in that, When the driving magnetic tripping device and the limiting magnetic tripping device are located in the same magnetic circuit, the driving magnetic tripping device and the limiting magnetic tripping device share a static conductor magnet.

4. The magnetic triggering device according to claim 3, characterized in that, The device includes a driving magnetic conductor, a limiting magnetic conductor, a stationary magnetic conductor, and a first limiting device. The driving magnetic conductor and the stationary magnetic conductor form the driving magnetic tripping device, and the limiting magnetic conductor, the stationary magnetic conductor, and the first limiting device form a limiting magnetic tripping device. The stationary magnetic conductor is arranged around the conductive busbar of the main circuit. The driving magnetic conductor is located at the open end of the stationary magnetic conductor and has a movement air gap between it and the stationary magnetic conductor. The limiting magnetic conductor is located on the side adjacent to the open end of the stationary magnetic conductor, and has a movement air gap between it and the stationary magnetic conductor. The first limiting device is located on the stationary magnetic conductor and on the displacement path of the moving contact piece, limiting the moving contact piece. The limiting magnetic conductor and the first limiting device are linked. When the limiting magnetic conductor moves toward the stationary magnetic conductor, the first limiting device can move relative to the moving contact piece, releasing the limiting of the moving contact piece.

5. The magnetic triggering device according to claim 4, characterized in that, A break is provided on one side of the stationary magnetic conductor with a limiting moving magnetic conductor, dividing one side of the stationary magnetic conductor into two independent parts to form a set of stationary magnetic conductors. A support spring for supporting the limiting moving magnetic conductor is provided at the break. The first limiting device is provided on the side of the stationary magnetic conductor where the limiting moving magnetic conductor is located.

6. The magnetic triggering device according to claim 2, characterized in that, When the driving magnetic tripping device and the limiting magnetic tripping device are located in different magnetic circuits, the driving magnetic tripping device includes a driving moving magnetic conductor structure and a driving stationary magnetic conductor, and the limiting magnetic tripping device includes a limiting stationary magnetic conductor, a limiting moving magnetic conductor, and a first limiting device; the driving stationary magnetic conductor and the limiting stationary magnetic conductor are respectively arranged around the conductive busbar of the main circuit, and the driving moving magnetic conductor structure and the limiting moving magnetic conductor are respectively located at the open ends of the corresponding driving stationary magnetic conductor and the limiting stationary magnetic conductor, and are respectively connected to their corresponding... A movement air gap is maintained between the driving stationary magnet and the limiting stationary magnet; the driving moving magnet structure and the limiting moving magnet are respectively located on two adjacent sides of the conductive busbar; the first limiting device is located on the limiting stationary magnet and on the displacement path of the moving contact piece, and the limiting moving magnet is linked with the first limiting device. When the limiting moving magnet moves toward the limiting stationary magnet, the first limiting device can move relative to the moving contact piece to release the limitation on the moving contact piece.

7. The magnetic triggering device according to any one of claims 4 or 6, characterized in that, The first limiting device includes a support frame and a limiting lever, the limiting lever being displaceably mounted on the support frame; the limiting moving magnetic conductor passes through the limiting lever and is linked with the limiting lever; in the initial position, the limiting lever is located on the displacement path of the moving contact piece; when the limiting moving magnetic conductor displaces and causes the limiting magnetic release device to disengage, the limiting lever displaces away from the moving contact piece, disengaging from contact with the moving contact piece and releasing the limiting of the moving contact piece.

8. The magnetic triggering device according to claim 7, characterized in that, When the driving magnetic conductor and the limiting magnetic conductor share the same static magnetic conductor, the support frame is provided with a mounting protrusion on the side facing the driving magnetic conductor structure. One end of the support spring supporting the driving magnetic conductor structure is sleeved on the mounting protrusion, and the other end is fixedly connected to the driving magnetic conductor structure.

9. The magnetic triggering device according to any one of claims 1 to 6, characterized in that, A limiting spring is provided on one side of the driving magnetic conductor structure. One end of the limiting spring is fixed and the other end is suspended. The suspended end of the limiting spring is bent toward the driving magnetic conductor structure to form a bent limiting end. In the initial position, the bent limiting end is located between the driving magnetic conductor structure and the moving contact piece, and is located on the displacement path of the driving magnetic conductor structure. When the driving magnetic conductor structure is displaced, the bending limiting end of the limiting spring forms a blockage on the driving magnetic conductor structure. When the driving magnetic conductor structure is displaced to the termination position, the bending limiting end of the limiting spring is located on the side of the driving magnetic conductor structure away from the moving contact piece, thus limiting the termination position of the driving magnetic conductor structure.

10. The magnetic triggering device according to claim 9, characterized in that, A protrusion is provided on the side of the driving magnetic conductor structure facing the limiting spring. A notch is formed between the side of the protrusion away from the moving contact piece and the side of the driving magnetic conductor structure. When the driving magnetic conductor structure is displaced to the termination position, the bending limiting end of the limiting spring abuts against the notch.

11. An excitation fuse, characterized in that, The device includes a housing, a conductive busbar passing through the housing, with both ends of the conductive busbar located outside the housing; an excitation source and a piston are disposed within the housing, the piston being positioned corresponding to the conductive busbar; the signal receiving end of the excitation source is connected to a trigger circuit; a magnetic triggering device as described in any one of claims 1 to 10 is disposed on the conductive busbar; a moving contact piece and a stationary contact piece are connected in series with the trigger circuit; in the initial position, the moving contact piece and the stationary contact piece are insulated from each other, so that the trigger circuit is in a non-conductive state; when the magnetic triggering device is activated, it drives the moving contact piece to make conductive contact with the stationary contact piece, activating the trigger circuit; the trigger circuit sends a trigger signal to the excitation source; the excitation source activates and releases high-pressure gas as a driving force, driving the piston to displace and disconnect the conductive busbar.

12. The excitation fuse according to claim 11, characterized in that, The magnetic triggering device is integrated outside the excitation fuse or inside the housing of the excitation fuse.

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