Driving mechanism and excitation fusing device for circuit protection device

Abstract

The utility model relates to the field of circuit protection, in particular to a driving mechanism and excitation fusing device for a circuit protection device, which comprises an excitation part and a moving part, and is characterized in that the moving part comprises a first connecting rod, a second connecting rod, a third connecting rod and an action executing part; the first connecting rod is hinged to the second connecting rod, the third connecting rod is linked with the action executing piece, and at the initial position, the second connecting rod abuts against the third connecting rod, so that the elastic piece connected with the action executing piece is in a compressed state; the excitation part can act according to a received trigger signal to drive the first connecting rod and the second connecting rod to rotate, so that the third connecting rod loses constraint, and the action executing part linearly moves under the driving of elastic force. The driving mechanism is integrated and matched with the fusing structure to form an excitation fusing structure, and the fuse can be disconnected after the action execution piece acts. The driving mechanism is small in impact force, and small current can be broken when the driving mechanism is combined with the fusing structure.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of circuit protection, and particularly relates to a driving mechanism for a circuit protection device and an excitation fusing device mechanically disconnected by the driving mechanism. BACKGROUND

[0002] A traditional fuse is a device for disconnecting a circuit by locally fusing with heat generated by current. The main problem is that it can only passively achieve disconnection, and it takes a lot of time to accumulate the heat required for fusing when an unexpected small current appears in the circuit, making it difficult to improve the disconnection speed. In addition, if the above small current is cut off by a switch, the problem is that it is more difficult to achieve a larger disconnection current than a traditional fuse, and it is necessary to distinguish the overcurrent amplitude interval, which may result in unsafe disconnection. Especially for DC overcurrent faults, since DC has no zero point, a general air switch cannot use the zero point to extinguish the arc, and the disconnection capacity is greatly reduced. Currently, there is also an excitation fuse that uses a gas generating device to release high-pressure gas as a driving force to drive the piston to displace and mechanically disconnect the conductive plate. This type of excitation fuse has a large disconnection current, but the conductive plate used in general excitation fuses is not easy to fuse compared to traditional thermal fusing fuses, and when a gas generator is used to release high-pressure gas as a driving force, the impact force generated is very large, and a large amount of smoke fills the shell, which has high requirements for the strength and material of the shell and other parts of the fuse, otherwise, it is easy to cause safety hazards such as shell cracking. SUMMARY

[0003] The purpose of the present application is to provide a driving mechanism for a circuit protection device and an excitation fusing device. The driving mechanism uses an excitation source such as electromagnetic energy that can be converted into mechanical energy, and cooperates with a linkage mechanism to achieve mechanical driving, with small impact force and low requirements for shell strength, and can disconnect small currents.

[0004] To achieve the above-mentioned purpose, the technical solution provided by the present application is a driving mechanism for a circuit protection device, comprising an excitation part and a movement part, the movement part comprising a first linkage, a second linkage, a third linkage, and an action execution member; the action execution member is connected with an elastic member; one end of the first linkage is hingedly connected with one end of the second linkage, and the third linkage is linked with the action execution member; in the initial position, the second linkage is movably abutted with the third linkage, and the elastic member connected with the action execution member is in a compressed state through the third linkage;

[0005] The excitation part can receive a trigger signal and apply a driving force to the first linkage to drive the first linkage to rotate the second linkage, so that the second linkage is separated from the third linkage, and the action execution member is driven by the elastic force to move linearly.

[0006] Preferably, the excitation part is an electromagnet, and the first connecting rod is located at one side of the electromagnet.

[0007] Preferably, the action execution member is arranged in a guide member, and both ends of the displacement direction of the action execution member are located outside the guide member.

[0008] Preferably, limiting walls are arranged at both outer sides of the guide member respectively, and the elastic member is arranged between the guide member and the limiting walls; one end of the action execution member extends outwardly and passes between the two limiting walls, and in the initial position, the third connecting rod presses the extended part of the action execution member, so that the elastic member is in a compressed state, and the action execution member is linked with the third connecting rod.

[0009] Preferably, a limiting member is fixedly arranged on the outer periphery of the action execution member, the limiting member is arranged in the guide member, one end of the limiting member located outside the guide member is connected with the elastic member, and the one end of the limiting member connected with the elastic member extends outwardly and passes between the two limiting walls; in the initial position, the third connecting rod spans the limiting member of the action execution member and presses on the extended part of the limiting member, so that the elastic member is in a compressed state.

[0010] Preferably, the elastic member is a spring.

[0011] Preferably, the first connecting rod, the second connecting rod and the third connecting rod are arranged on corresponding rotating shafts respectively, and the first connecting rod, the second connecting rod and the third connecting rod can rotate relative to the rotating shafts respectively.

[0012] Preferably, the first connecting rod and the second connecting rod are hinged through a connecting shaft, and the connecting shaft is arranged in an arc-shaped waist-shaped hole.

[0013] Preferably, the excitation part and the movement part are arranged in adjacent housings respectively, the excitation part and the first connecting rod are arranged in an excitation housing, the second connecting rod, the third connecting rod, the elastic member and the action execution member movement part are arranged in a movement part housing, a waist-shaped hole is arranged on the side wall of the side adjacent to the excitation housing and the movement part housing, and the waist-shaped hole communicates the excitation housing and the movement part housing; the connecting shaft for connecting the first connecting rod and the second connecting rod is arranged in the waist-shaped hole.

[0014] Preferably, one end of the third connecting rod is rotatably arranged on the rotating shaft, and in the initial position, the other end spans the action execution member and abuts against one end of the second connecting rod and presses on one side of the action execution member.

[0015] The application further provides an energized fuse device for circuit protection, at least one fuse structure is arranged on a displacement path of the action execution member of the driving mechanism, the fuse structure comprises a fuse body penetrating an arc-extinguishing medium, one end of the action execution member penetrates the fuse structure, and the fuse body penetrates one end of the action execution member in the fuse structure; when the energizing part acts according to the received trigger signal, the third connecting rod is separated from the second connecting rod, and the action execution member is displaced to break the fuse body under the elastic force of the elastic member.

[0016] Preferably, the fuse structure comprises an upper shell and a lower shell, an arc-extinguishing chamber filled with an arc-extinguishing medium and a displacement channel are formed between the upper shell and the lower shell, a first conductor, the fuse body and a second conductor are sequentially arranged between the upper shell and the lower shell in series, the fuse body penetrates the displacement channel and the arc-extinguishing medium; one end of the action execution member penetrates the displacement channel, and the fuse body penetrates one end of the action execution member in the displacement channel; one end of the first conductor and the second conductor located outside the upper shell and the lower shell is a connection end of the energized fuse device.

[0017] Preferably, a sealing member is arranged between the contact surface of the upper shell and the lower shell through which the first conductor and the second conductor penetrate and outside the arc-extinguishing medium.

[0018] Preferably, one end of the action execution member penetrating the fuse structure is in sealing contact with the fuse structure.

[0019] The driving mechanism of the application realizes mechanical driving through the magnetic field force of the electromagnet and the connecting rod mechanism, and the impact on the shell is small, and the strength requirement of the shell is low. The application solves the disadvantages of the traditional gas generator as an energizing source, chemical explosion reaction of the gas generating agent, release of high-pressure gas as driving force, and high impact force, which leads to high strength and material requirements of the shell and other parts.

[0020] Through reasonable spatial layout of the connecting rod mechanism, the space utilization rate is improved, and the product volume is reduced.

[0021] The energized fuse device is formed by the cooperation of the driving mechanism and the fuse structure, so that the fuse structure has the function of fusing, and the fuse structure can be disconnected by the driving mechanism in a mechanical way, so that the traditional fuse has the unexpected small current breaking capacity, and the small current breaking capacity of the fuse structure is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structure schematic view of an energized fuse device combined with a driving mechanism and a fuse structure.

[0023] Figure 2It is the structure schematic diagram of the excitation fuse device combined with the driving mechanism and the three fusing structures.

[0024] Figure 3 It is the structure schematic diagram of the excitation part and the first connecting rod.

[0025] Figure 4 It is the structure schematic diagram of the second connecting rod, the third connecting rod and the action execution member of the motion part.

[0026] Figure 5 It is the structure schematic diagram of the motion part combined with the fusing structure.

[0027] Figure 6 It is Figure 5 After the action, it is the structure schematic diagram of the fuse breaking.

[0028] Reference signs:

[0029] The excitation part 1, the excitation source 11, the excitation shell 12, the motion part 2, the fusing structure 3, the motion part shell 20, the first connecting rod 21, the second connecting rod 22, the third connecting rod 23, the action execution member 24, the connecting shaft 25, the arc-shaped limiting hole 26, the limiting member 27, the power spring 28, the guide cylinder 29, the sealing ring 30, the upper shell 31, the lower shell 32, the first conductor 33, the fuse 34, the second conductor 35, the arc extinguishing chamber 36, the sealing member 37, the motion part bottom shell 38, the top cover 39, the limiting wall 40. DETAILED DESCRIPTION

[0030] The circuit protection device driving mechanism of the application comprises an excitation part and a motion part, the motion part comprising a first connecting rod, a second connecting rod, a third connecting rod and an action execution member; the action execution member is connected with an elastic member; one end of the first connecting rod and one end of the second connecting rod are hinged, the third connecting rod is linked with the action execution member, and in the initial position, the second connecting rod movably abuts against the third connecting rod, and the elastic member connected with the action execution member is in a compressed state through the third connecting rod.

[0031] The excitation part can receive a trigger signal and apply a driving force to the first connecting rod to drive the first connecting rod to rotate and make the second connecting rod move away from the third connecting rod, and the action execution member is driven to move linearly by the elastic force.

[0032] The excitation fuse device of the application is provided with at least one fusing structure in the displacement path of the action execution member of the driving mechanism, the fusing structure comprises a fuse passing through an arc extinguishing medium, and the action execution member clamps the fuse through the fusing structure; when the excitation part acts according to the received trigger signal, the displacement of the action execution member can break the fuse.

[0033] The above technical solutions are described in detail in the preferred embodiments. The orientation words involved in the description are defined by the orientation shown in the drawings, which does not limit the technical solutions of the application.

[0034] Referring to Figures 1 to 6 The driving mechanism comprises an excitation part 1 and a moving part 2. The excitation part 1 comprises an excitation source 11 and an excitation housing 12, and the excitation source 11 is installed on the excitation housing 12. The excitation source 11 is a component that can act on an excitation signal, and in this embodiment, it is an electromagnet, and in other embodiments, it is a device capable of converting other energy into mechanical kinetic energy. Using an electromagnet as the excitation source can prevent the generation of gunpowder smoke during the driving process. The signal receiving end of the excitation source 11 can be connected to an external trigger signal circuit, and the external trigger signal circuit provides a trigger signal to the excitation source 11. When it is an electromagnet, the electromagnet acts according to the received electrical signal to generate a magnetic field force, which acts on the moving part 2 to make the moving part 2 complete the designed movement route and function.

[0035] The moving part 2 comprises a moving part housing 20, and a first connecting rod 21, a second connecting rod 22, a third connecting rod 23, and an action execution member 24 connected in series. The moving part housing 20 is arranged adjacent to the excitation housing 12, the first connecting rod 21 is located in the excitation housing 12, the second connecting rod 22, the third connecting rod 23, and the action execution member 24 are located in the moving part housing 20, and one end of the action execution member 24 penetrates through the moving part housing 20.

[0036] The first connecting rod 21 is located at one side of the electromagnet 11, and the first connecting rod 21, the second connecting rod 22 and the third connecting rod 23 are rotatably arranged on corresponding rotating shafts, respectively. The first connecting rod 21, the second connecting rod 22 and the third connecting rod 23 rotate relative to the rotating shafts, respectively. By placing the excitation source 11 at one side of the first connecting rod 21, the driving signal can be transmitted more conveniently while saving space. The first connecting rod 21 is rotatably arranged on a rotating shaft in the excitation shell 12, and one end of the first connecting rod 21 away from the electromagnet 11 and one end of the second connecting rod 22 are hingedly connected through a connecting shaft 25. An arc-shaped waist-shaped hole 26 is formed on the side where the excitation shell 12 and the moving part shell 20 are connected, and the connecting shaft 25 is arranged in the arc-shaped waist-shaped hole 26. When the first connecting rod 21 rotates, the second connecting rod 22 is driven to rotate, and the connecting shaft 25 is displaced in the arc-shaped waist-shaped hole 26. The arc-shaped waist-shaped hole 26 limits the initial position and the terminal position of the first connecting rod 21 and the second connecting rod 22. By sharing the connecting shaft 25 of the first connecting rod 21 and the second connecting rod 22, the structure can be simplified, the movement is more convenient, and the space of the product is saved. One end of the first connecting rod 21 close to the electromagnet 11 serves as the action end of the magnetic field force of the electromagnet 11. When the electromagnet 11 is powered to generate a magnetic field force, the end close to the electromagnet 11 of the first connecting rod 21 is displaced towards the electromagnet 11, thereby driving the first connecting rod 21 to rotate around the rotating shaft. The second connecting rod 22 and the third connecting rod 23 are arranged at opposite sides of the moving part 2. The second connecting rod 22 is rotatably arranged on a rotating shaft at one side of the moving part shell, and one end of the second connecting rod 22 is hingedly connected to the first connecting rod 21 through the connecting shaft 25, and the other end is a free end. One end of the third connecting rod 23 is rotatably arranged on a rotating shaft at the other side of the moving part shell, and the other end is a free end. The free end of the third connecting rod 23 can abut against the free end of the second connecting rod 22, or the two free ends can not interfere with each other through rotation of the connecting rods.

[0037] The action execution member 24 is located on one side between the rotation shafts of the second connecting rod 22 and the third connecting rod 23. The action execution member 24 is a linearly displaceable rod-shaped structure, and a limiting member 27 is fixedly arranged on the outer periphery of one end of the action execution member 24. A power spring 28 is located between the limiting member 27 and the movement part shell 20. In the initial position, the third connecting rod 23 is pressed against the limiting member 27, so that the power spring 28 is in a compressed state. The extension and contraction of the power spring 28 can be guided by the structure inside the movement part shell, so as to ensure that the power spring 28 extends and contracts linearly. For example, the power spring is sleeved on a guide column, the limiting member 27 is arranged through the outer periphery of the guide column and is in contact with the power spring 28, or the power spring 28 is located in a guide space. The power spring supports the action execution member 24, and the action execution member 24 linearly displaces under the action of the spring elastic force. In the initial position, the free end of the third connecting rod 23 is located outside the action execution member 24, the free end of the second connecting rod 22 is pressed against the free end of the third connecting rod 23, the third connecting rod 23 is pressed against one side of the limiting member 27, and the power spring 28 is in a compressed state by pressing the limiting member 27. The free end of the third connecting rod 23 is located above the limiting member 27 of the action execution member 24 and is in contact with the free end of the second connecting rod 22, and at the same time, the third connecting rod 23 is pressed against the limiting member 27, so that the power spring 28 is in a compressed state. The structure of the third connecting rod 23 crossing the limiting member makes full use of the space inside the movement part shell, improves the utilization rate of the space inside the movement part shell, and reduces the space of the movement part shell.

[0038] In order to make the displacement of the action execution member 24 smooth, a guide 29 is arranged on the shell of the movement part 2. In this example, the guide 29 is a guide cylinder, the outer periphery of the action execution member 24 is arranged through the guide 29, and the inner wall of the guide 29 is matched with the outer periphery of the action execution member 24, so as to ensure that the action execution member 24 linearly displaces along the guide 29. In this embodiment, the limiting member 27 fixed to the outer periphery of the action execution member 24 is arranged through the guide 29, the structure of the limiting member 27 arranged through the guide 29 is matched with the structure of the inner wall of the guide 29, the limiting member 27 linearly displaces along the guide 29, and the action execution member 24 fixedly connected with the limiting member 27 displaces together. The power spring 28 is located on one side of the outer periphery of the guide 29. In order to make the force acting on the action execution member uniform and ensure that the action execution member linearly displaces smoothly, the power spring 28 is uniformly arranged on the outer periphery of the guide 29. One end of the limiting member 27 extends outward and is in contact with one end of the power spring 28.

[0039] The action execution member 24 is arranged through the guide 29, which facilitates the combined installation and replacement of the action execution member and the fuse structure, improves the transmission efficiency of the mechanism, and facilitates the breaking of the fuse body.

[0040] When the electromagnet 11 receives the trigger signal (electric signal) and is energized, the magnetic field force generated thereby attracts the first connecting rod 21 and drives the first connecting rod 21 to rotate around the rotating shaft. When the first connecting rod 21 rotates to the terminal position, the second connecting rod 22 connected with the first connecting rod 21 rotates synchronously to the terminal position. At this time, the second connecting rod 22 is separated from the third connecting rod 23, and the third connecting rod 23 is no longer restricted by the second connecting rod 22. Under the driving of the power spring 28, the third connecting rod 23 rotates, and at the same time, the action executing member 24 is displaced under the action of the elastic force to execute the corresponding action.

[0041] The above-mentioned driving mechanism can be combined with the fuse structure 3 to form an excitation fuse device.

[0042] The fuse structure 3 is a fuse structure and is arranged on the displacement path of the action executing member 24. The fuse structure 3 comprises a shell formed by an upper shell 31 and a lower shell 32, and a first conductor 33, a fuse 34 and a second conductor 35 are sequentially arranged in the upper shell 31 and the lower shell 32. The first conductor 33, the fuse 34 and the second conductor 35 are sequentially connected in series. One end of the first conductor 33 and the second conductor 35 is located outside the shell as a connection end of the fuse structure. A displacement passage is arranged at the position of the upper shell 31 and the lower shell 32 corresponding to the action executing member 24. A sealed arc-extinguishing chamber 36 is arranged between the upper shell 31 and the lower shell 32 on both sides of the displacement passage, and an arc-extinguishing medium is filled in the arc-extinguishing chamber. The fuse 33 is arranged in the arc-extinguishing medium and passes through the displacement passage. The fuse 34 is provided with a narrow neck for fusing and a breaking weak part for mechanical breaking. The narrow neck and the breaking weak part of the fuse 34 are both located in the arc-extinguishing medium. One end of the action executing member 24, which is not provided with a limiting member, passes through the movement part shell 20 and extends into the displacement passage in the fuse structure 3, and the fuse 34 is arranged in the narrow hole at the end of the action executing member 24. Of course, in some other embodiments, the fuse 34 can also be clamped at the end of the action executing member 24. In this structure, a clamping member needs to be arranged at the end of the action executing member 24.

[0043] The end of the action executing member 24 extending into the displacement passage is provided with a sealing groove protruding from the outer periphery of the action executing member 24. A sealing ring 30 is arranged in the sealing groove, and the action executing member 24 is in sealing contact with the displacement passage through the sealing ring 30. The sealing ring 30 is located on the side of the fuse 34 facing the movement part. The sealing groove protruding from the outer periphery of the action executing member 24 can limit the action executing member 24, preventing one end of the fuse 34 from entering the movement part shell 20 under the action of the elastic force and causing the action executing member and the displacement passage to lose the sealing contact.

[0044] A sealing member 37 is arranged between the contact surfaces of the upper shell 31 and the lower shell 32 outside the arc-extinguishing chamber 36 to seal the gap between the contact surfaces of the upper shell 31 and the lower shell 32.

[0045] When the action execution member 24 is displaced under the action of the elastic force, the action execution member 24 can pull off the fuse 34, disconnect the main circuit where the fuse 34 is located, and perform circuit protection. The fuse 34 is pulled off from the disconnection weak point, and the mechanical fracture generated by the disconnection of the fuse 34 is located in the arc extinguishing medium. The electric arc generated by the disconnection of the fuse 34 is extinguished by the arc extinguishing medium.

[0046] In some embodiments, the motion part 2 is arranged above and below the fuse structure 3 and is fixedly connected by bolts. The excitation part 1 is located on one side of the motion part 2 and the fuse structure 3 and is fixedly connected to the motion part 2 and the fuse structure 3 by bolts. The shell of the motion part 2 includes a motion part bottom shell 38, and a top cover 39 is arranged on the motion part bottom shell 38. The guide cylinder 29 is integrally formed with the motion part bottom shell 38. The action execution member 24 is arranged in the guide 29, and limiting walls 40 are arranged on the opposite two outer sides of the guide 29. The limiting walls 40 are in a U-shaped structure, and the two opposite limiting walls 40 form an elliptical limiting space. The power spring 28 is arranged in the guide space formed between the guide cylinder 29 and the limiting walls 40. The limiting member 27 of the action execution member 24 is displaced along the limiting walls 40, and a part of the limiting member 27 passes through the gap between the two limiting walls 40 and is linked with the third connecting rod 23. Through the above structure, the power spring 28 is arranged in a certain guide space, which can improve the effective power of the energy stored by the power spring 28. The second connecting rod 22 and the third connecting rod 23 are located in the shell of the motion part 2 outside the guide 29 and the limiting walls and are linked with the limiting member 27 of the action execution member 24. The first connecting rod 21 is located in the shell of the excitation part 1. The connecting shaft 25 connected with the first connecting rod 21 and the second connecting rod 22 passes through the shells of the excitation part 1 and the motion part 2.

[0047] The signal receiving end of the excitation source 11 of the excitation part 1 is arranged on the shell of the excitation part and can be connected with an external trigger signal circuit.

[0048] In some embodiments, a plurality of fuse structures 3 can be arranged in sequence. Referring to Figure 2 , the fuse structure is arranged as three. However, correspondingly, the end part of the action execution member 24 for pulling off needs to span multiple fuse structures 3 and clamp the fuses 34 in multiple fuse structures 2.

[0049] Working principle:

[0050] In the initial position, a displacement gap is reserved between the first connecting rod and the electromagnet. The second connecting rod abuts against the third connecting rod, the third connecting rod is linked with the action execution member, the power spring is compressed, the action execution member connected with the power spring is in the initial position, and the fuse of the fuse structure is clamped.

[0051] In normal conduction, the first conductor and the second conductor of the fuse structure are respectively connected in series with the protection circuit, and the current flows through the first conductor, the fuse, and the second conductor.

[0052] When the circuit is overloaded, short-circuited or in abnormal condition, the excitation source acts according to the received trigger signal to generate a magnetic force (or a mechanical force) to drive the first connecting rod to rotate around the rotating shaft, thereby driving the second connecting rod to rotate, and after the second connecting rod rotates by a certain angle, it is separated from the abutment with the third connecting rod, the third connecting rod loses the binding force, and the elastic force of the power spring drives the action execution member and the third connecting rod to displace together, and in the displacement process of the action execution member, the fuse is pulled off, thereby disconnecting the circuit. Since the mechanical breaking point of the fuse is located in the arc extinguishing medium, arc extinguishing is performed through the arc extinguishing medium.

[0053] When the overload or short-circuit current is a large current, the fuse may be first melted at the first time, and then mechanically disconnected by the action execution member.

[0054] Regardless of whether the fuse is melted or mechanically disconnected, the breaking point is located in the arc extinguishing medium, and arc extinguishing can be performed through the arc extinguishing medium.

Claims

1. A drive mechanism for a circuit protection device, characterized by comprising: The actuating part and the moving part are provided, the moving part comprises a first connecting rod, a second connecting rod, a third connecting rod and an action execution member; the action execution member is connected with an elastic member; one end of the first connecting rod is hingedly connected with one end of the second connecting rod; the third connecting rod is connected with the action execution member; in the initial position, the second connecting rod is movably connected with the third connecting rod; the third connecting rod makes the elastic member connected with the action execution member in a compressed state. The actuating part can receive a trigger signal and act on the first connecting rod to exert a driving force on the first connecting rod, so as to drive the first connecting rod to rotate the second connecting rod, so that the second connecting rod is separated from the third connecting rod; the action execution member is driven by the elastic force to move linearly.

2. The drive mechanism for a circuit protection device according to claim 1, characterized by The actuating part is an electromagnet, and the first connecting rod is located on one side of the electromagnet.

3. The drive mechanism for a circuit protection device according to claim 1, wherein The action execution member is arranged in a guide member, and both ends of the displacement direction of the action execution member are located outside the guide member.

4. The drive mechanism for a circuit protection device according to claim 3, wherein Limiting walls are arranged on the opposite two outer sides of the guide member, and the elastic member is arranged between the guide member and the limiting walls; one end of the action execution member extends outward and passes between the two limiting walls, and in the initial position, the third connecting rod abuts against the extended part of the action execution member, so that the elastic member is in a compressed state, and the action execution member is connected with the third connecting rod.

5. The drive mechanism for a circuit protection device according to claim 4, wherein A limiting member is fixedly arranged on the outer periphery of the action execution member, the limiting member is arranged in the guide member, one end of the limiting member located outside the guide member is connected with the elastic member, and the other end of the limiting member connected with the elastic member extends outward and passes between the two limiting walls; in the initial position, the third connecting rod crosses the limiting member of the action execution member and abuts against the extended part of the limiting member, so that the elastic member is in a compressed state.

6. The drive mechanism for a circuit protection device according to claim 1, wherein The elastic member is a spring.

7. The drive mechanism for a circuit protection device according to any one of claims 1 to 6, characterized in that, The first connecting rod, the second connecting rod and the third connecting rod are respectively arranged on corresponding rotating shafts, and the first connecting rod, the second connecting rod and the third connecting rod can rotate relative to the rotating shafts.

8. The drive mechanism for a circuit protection device according to claim 7, wherein The first connecting rod and the second connecting rod are hingedly connected by a connecting shaft, and the connecting shaft is arranged in an arc-shaped waist-shaped hole.

9. The drive mechanism for a circuit protection device according to claim 8, wherein The actuating part and the moving part are respectively arranged in adjacent housings, the actuating part and the first connecting rod are arranged in an actuating housing, the second connecting rod, the third connecting rod, the elastic member and the action execution member of the moving part are arranged in a moving part housing, a waist-shaped hole is formed in the side wall of the side adjacent to the actuating housing and the moving part housing, and the connecting shaft for connecting the first connecting rod and the second connecting rod is arranged in the waist-shaped hole.

10. The drive mechanism for a circuit protection device of claim 7, wherein One end of the third connecting rod is rotatably arranged on the rotating shaft, and in the initial position, the other end abuts against one end of the second connecting rod and abuts against one side of the action execution member.

11. An energizing fuse device, characterized by At least one fuse structure is arranged on the displacement path of the action execution member of the driving mechanism according to any one of claims 1 to 10, the fuse structure comprising a fuse body arranged in an arc extinguishing medium, one end of the action execution member being arranged in the fuse structure, and the fuse body passing through the one end of the action execution member arranged in the fuse structure; when the excitation part operates according to the received trigger signal, the third connecting rod is separated from the second connecting rod, and the action execution member is displaced to break the fuse body under the elastic force of the elastic member.

12. The energized fuse apparatus of claim 11, wherein, The fuse structure comprises an upper shell and a lower shell, and an arc extinguishing chamber filled with arc extinguishing medium and a displacement channel are formed between the upper shell and the lower shell, a first conductor, the fuse body and a second conductor are sequentially arranged in series between the upper shell and the lower shell, and the fuse body passes through the displacement channel and the arc extinguishing medium; one end of the action execution member is arranged in the displacement channel, and the fuse body passes through the one end of the action execution member arranged in the displacement channel; and one end of the first conductor and the second conductor located outside the upper shell and the lower shell is the connection end of the excitation fuse device.

13. The energized fuse apparatus of claim 12, wherein, A sealing member is arranged between the contact surface of the upper shell and the lower shell through which the first conductor and the second conductor pass and outside the arc extinguishing medium.

14. An energizing fuse arrangement according to any one of claims 11 to 13, characterized in that The one end of the action execution member arranged in the fuse structure is in sealing contact with the fuse structure.

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