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CN-122000258-A - Driving mechanism for circuit protection device and excitation fusing device

CN122000258ACN 122000258 ACN122000258 ACN 122000258ACN-122000258-A

Abstract

The invention relates to the field of circuit protection, in particular to a driving mechanism and an excitation fusing structure for a circuit protection device, which comprises an excitation part and a movement part, wherein the movement part comprises a first connecting rod, a second connecting rod, a third connecting rod and an action executing piece, the first connecting rod is hinged with the second connecting rod, the third connecting rod is linked with the action executing piece, the second connecting rod is abutted with the third connecting rod when in an initial position, an elastic piece connected with the action executing piece is in a compressed state, and 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 is out of constraint, and the action executing piece is driven by elasticity to linearly displace. The driving mechanism is integrated with the fusing structure to form an excitation fusing structure, and after the action of the action executing piece, the melt can be disconnected. The driving mechanism has small impact force, and can break small current when being combined with the fusing structure.

Inventors

  • ZHANG XIN
  • SHI XIAOGUANG

Assignees

  • 西安中熔电气股份有限公司

Dates

Publication Date
20260508
Application Date
20241101

Claims (14)

  1. 1. The driving mechanism for the circuit protection device is characterized by comprising an excitation part and a movement part, wherein the movement part comprises a first connecting rod, a second connecting rod, a third connecting rod and an action executing piece, the action executing piece is connected with an elastic piece, one end of the first connecting rod is hinged with one end of the second connecting rod, the third connecting rod is linked with the action executing piece, the second connecting rod is movably abutted with the third connecting rod when in an initial position, and the elastic piece connected with the action executing piece is in a compressed state through the third connecting rod; The excitation part can receive the trigger signal to act, applies driving force to the first connecting rod, drives the first connecting rod to drive the second connecting rod to rotate, enables the second connecting rod to be separated from contact with the third connecting rod, and the action executing piece is driven by elastic force to linearly displace.
  2. 2. The drive mechanism for a circuit protection device according to claim 1, wherein the exciting portion is an electromagnet, and the first link is located on one side of the electromagnet.
  3. 3. The drive mechanism for a circuit protection device according to claim 1, wherein the operation actuator is inserted into a guide, and both ends of the operation actuator in a displacement direction are located outside the guide.
  4. 4. The driving mechanism for a circuit protection device according to claim 3, wherein the guide member is provided with a stopper wall on each of opposite outer sides thereof, the elastic member is provided between the guide member and the stopper wall, one end of the actuating member extends outward and passes through the space between the stopper walls at a position corresponding to the two stopper walls, and the third link presses the extension portion of the actuating member to make the elastic member in a compressed state, thereby making the actuating member and the third link each other at an initial position.
  5. 5. The driving mechanism for a circuit protection device according to claim 4, wherein a stopper is fixedly provided on an outer periphery of the operation actuator, the stopper is inserted into the guide, one end of the stopper located outside the guide is connected to the elastic member, one end of the stopper connected to the elastic member extends outward between the two stopper walls and passes through the space between the two stopper walls, and the third link spans the stopper of the operation actuator and presses against an upper surface of an extension portion of the stopper at an initial position to bring the elastic member into a compressed state.
  6. 6. The drive mechanism for a circuit protection device according to claim 1, wherein the elastic member is a spring.
  7. 7. The drive mechanism for a circuit protection device according to any one of claims 1 to 6, wherein the first link, the second link, and the third link are provided on corresponding rotating shafts, respectively, and the first link, the second link, and the third link are rotatable with respect to the rotating shafts, respectively.
  8. 8. The drive mechanism for a circuit protection device according to claim 7, wherein the first link and the second link are hinged by a connecting shaft, and the connecting shaft is inserted into the arc-shaped waist-shaped hole.
  9. 9. The drive mechanism for a circuit protection device according to claim 8, wherein the exciting section and the moving section are respectively located in adjacent cases, the exciting section and the first link are located in an exciting case, the second link, the third link, the elastic member, and the moving section of the moving section are located in a moving section case of the moving section, a waist-shaped hole for communicating the exciting case and the moving section case is formed in a side wall of the exciting case adjacent to the moving section case, and a connecting shaft for connecting the first link and the second link is inserted into the waist-shaped hole.
  10. 10. The drive mechanism for a circuit protection device according to claim 7, wherein one end of the third link is rotatably provided on the rotation shaft, and the other end of the third link is abutted against one end of the second link across the operation actuator at the initial position, and is abutted against one side of the operation actuator.
  11. 11. An exciting fusing device is characterized in that at least one fusing structure is arranged on a displacement path of the action executing piece of the driving mechanism according to any one of claims 1 to 10, the fusing structure comprises a melt penetrating through an arc extinguishing medium, one end of the action executing piece penetrates through the fusing structure, the melt penetrates through one end of the action executing piece, which is located in the fusing structure, and when the exciting part acts according to a received trigger signal, the third connecting rod is separated from abutting with the second connecting rod, and the action executing piece displaces to break the melt under the action of the elasticity of the elastic piece.
  12. 12. The exciting fuse device according to claim 11, wherein the fuse structure comprises an upper case and a lower case, an arc extinguishing chamber filled with an arc extinguishing medium and a displacement channel are formed between the upper case and the lower case, a first conductor, the melt and a second conductor are sequentially arranged between the upper case and the lower case in a penetrating manner, the melt penetrates through the displacement channel and the arc extinguishing medium, one end of the action executing member penetrates through the displacement channel, the melt penetrates through one end of the action executing member located in the displacement channel, and one end of the first conductor and the second conductor located outside the upper case and the lower case is a connecting end of the exciting fuse device.
  13. 13. An energized fuse device according to claim 12, wherein a seal is provided between the contact surfaces of the upper and lower housings, which are located outside the extinguishing medium, through which the first and second conductors pass.
  14. 14. An energized fusing device according to any one of the claims 11 to 13, wherein one end of said action executing member which is provided through said fusing structure is in sealing contact with said fusing structure.

Description

Driving mechanism for circuit protection device and excitation fusing device Technical Field The invention belongs to the field of circuit protection, and particularly relates to a driving mechanism for a circuit protection device and an excitation fusing device which is mechanically disconnected through the driving mechanism. Background A conventional fuse is a device that opens a circuit by means of local fusing using heat generated by an electric current. The main problem is that the breaking can only be realized passively, and particularly when unexpected small current occurs in a circuit, a large amount of time is needed to accumulate heat required by fusing, so that the breaking speed is difficult to improve. In addition, if the switch is adopted to cut off the small current, the problem is that the realization of larger breaking current capacity is more difficult than that of the traditional fuse, the overcurrent amplitude interval needs to be distinguished, and unsafe breaking situations can occur. Particularly, for the direct current over-current fault, as the direct current has no zero crossing point, the common air switch cannot adopt zero crossing point to quench arcs, and the breaking capacity is greatly reduced. Currently, there is also an exciting fuse, which uses a gas generator to release high-pressure gas as a driving force to drive a piston to displace to mechanically disconnect a conductive plate. The exciting fuse has large breaking current, but the conducting plate mode adopted by the exciting fuse is not easy to fuse compared with the traditional hot-melting fuse, and when the gas generator is adopted to release high-pressure gas as driving force, the generated impact force is very large, and a large amount of smoke dust is filled in the shell, so that the requirements on the strength and the materials of the shell and other parts of the fuse are very high, otherwise, the shell is easy to crack and other potential safety hazards are easily caused. Disclosure of Invention The invention aims to provide a driving mechanism and an excitation fusing device for a circuit protection device, wherein the driving mechanism adopts electromagnetic energy and other excitation sources capable of being converted into mechanical energy, and is matched with a connecting rod mechanism to realize mechanical driving, so that the impact force is small, the requirement on the strength of a shell is low, and smaller current can be cut off. In order to achieve the above purpose, the technical scheme provided by the invention is that the driving mechanism for the circuit protection device comprises an excitation part and a movement part, wherein the movement part comprises a first connecting rod, a second connecting rod, a third connecting rod and an action executing piece, the action executing piece is connected with an elastic piece, one end of the first connecting rod is hinged with one end of the second connecting rod, the third connecting rod is linked with the action executing piece, and when in an initial position, the second connecting rod is movably abutted with the third connecting rod, and the elastic piece connected with the action executing piece is in a compression state through the third connecting rod; The excitation part can receive the trigger signal to act, applies driving force to the first connecting rod, drives the first connecting rod to drive the second connecting rod to rotate, enables the second connecting rod to be separated from contact with the third connecting rod, and the action executing piece is driven by elastic force to linearly displace. Preferably, the exciting portion is an electromagnet, and the first connecting rod is located at one side of the electromagnet. Preferably, the motion executing piece is arranged in the guide piece in a penetrating way, and two ends of the motion executing piece in the displacement direction are positioned outside the guide piece. Preferably, two opposite outer sides of the guide piece are respectively provided with a limiting wall, the elastic piece is arranged between the guide piece and the limiting walls, one end of the action executing piece extends outwards at the position corresponding to the two limiting walls and penetrates through the space between the two limiting walls, and when in an initial position, the third connecting rod abuts against the extending part of the action executing piece to enable the elastic piece to be in a compressed state, so that the action executing piece is linked with the third connecting rod. Preferably, the periphery of the action executing member is fixedly provided with a limiting member, the limiting member is arranged in the guide member in a penetrating manner, one end of the limiting member, which is positioned outside the guide member, is connected with the elastic member, one end of the limiting member, which is connected with the elastic member, corresponds to the position between the two lim