Short circuit protection mechanism of circuit breaker

Abstract

The utility model discloses a short-circuit protection mechanism of a circuit breaker. The short-circuit protection mechanism comprises a magnet yoke, an elastic element, an armature and a trigger assembly, the magnet yoke generates a magnetic field when short-circuit current passes through; the elastic element is arranged at one end of the top of the yoke; the armature is close to the top of the magnet yoke, one end of the armature is connected with the elastic element, and the armature is separated from the magnet yoke under the action of the elastic element; the trigger assembly is arranged close to the armature; when the short-circuit current passes through the magnet yoke, the armature is attracted to the magnet yoke due to the magnetic field effect and drives the trigger assembly to execute the breaking operation of the circuit breaker. Through the arrangement, the mechanism simplification degree and the action reliability are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit breaker technical field especially relates to a short circuit protection mechanism of circuit breaker. BACKGROUND

[0002] In the existing low-voltage circuit breaker technology, the short circuit protection mechanism is the key unit to ensure that the circuit is disconnected in time when a large current fault occurs, and its operating principle is usually based on electromagnetic tripping mechanism.

[0003] The current mainstream short circuit protection scheme generally uses a coil as the core component to generate a magnetic field. When a short circuit current occurs in the circuit, a large current passes through the coil, forming a strong magnetic field around the coil, thereby attracting the armature cooperating with it to deflect and act. However, this structure has high complexity, requires the arrangement of a coil and ensures its power supply, insulation and heat dissipation performance, which is not conducive to the development of compact circuit breaker products. At the same time, electromagnetic interference or coil failure may cause misoperation or malfunction, reducing the protection reliability. In addition, the coil magnetic circuit design and armature matching precision are high, and if the process or material control is not strict, it is easy to cause large performance fluctuations between products. SUMMARY

[0004] In order to solve the problems of the prior art, the purpose of the utility model is to provide a short circuit protection mechanism of circuit breaker. The structure of the short circuit protection mechanism is simpler and more reliable.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A short circuit protection mechanism of circuit breaker, comprising: a magnetic yoke, an elastic element, an armature and a trigger assembly; the magnetic yoke generates a magnetic field when a short circuit current passes through; the elastic element is arranged at one end of the top of the magnetic yoke; the armature is arranged close to the top of the magnetic yoke, one end of the armature is connected with the elastic element, and the armature is kept in a separated state with the magnetic yoke by the action of the elastic element; the trigger assembly is arranged close to the armature; when the short circuit current passes through the magnetic yoke, the armature is attracted to the magnetic yoke due to the action of the magnetic field, and drives the trigger assembly to perform the breaking operation of the circuit breaker.

[0007] Further, the short circuit protection mechanism further comprises a static contact, a moving contact and an assembly groove; the magnetic yoke is connected with the static contact, and the magnetic yoke and the static contact are both arranged in the assembly groove; the moving contact is arranged at the bottom of the trigger assembly; one end of the static contact is connected with the terminal of the circuit breaker, and the other end can cooperate with the moving contact.

[0008] Further, the trigger assembly comprises a rotating shaft, a rotating piece and a lock catch, the rotating shaft is rotatably arranged in the housing of the circuit breaker, the rotating piece is rotatably arranged on the rotating shaft, the lock catch is arranged on the rotating piece and can cooperate with the armature, and the moving contact is arranged at the bottom of the rotating piece; when the short circuit current passes through the magnetic yoke, the armature is attracted to the magnetic yoke due to the action of the magnetic field, and the armature pushes the lock catch to separate the moving contact from the static contact.

[0009] Further, the short-circuit protection mechanism further comprises a handle device, the handle device is rotationally arranged at the top of the circuit breaker, the handle device is provided with a transmission rod, and the top of the rotating part is provided with an arc-shaped slot matched with the transmission rod; when the handle device is rotated in a first rotating direction, the transmission rod drives the rotating part to rotate in the first rotating direction around the rotating shaft, and the static contact and the dynamic contact collide to form an electrical contact pair; when the handle device is rotated in a second rotating direction, the transmission rod drives the rotating part to rotate in the second rotating direction around the rotating shaft, and the static contact and the dynamic contact are separated.

[0010] Further, the assembly groove is made of light insulating material.

[0011] Further, the elastic element is provided with a fixing shaft in the middle, and the fixing shaft is arranged in the housing of the circuit breaker.

[0012] Further, the elastic element is a torsion spring.

[0013] The short-circuit protection mechanism of the circuit breaker can realize the technical path of triggering the action of the circuit breaker without a coil structure by the magnetic field generated by the magnetic yoke under the action of a short-circuit current to attract the armature and drive the trigger assembly to complete the breaking operation, avoid the complexity of coil power supply, insulation and magnetic circuit cooperation in the traditional electromagnetic release structure, and improve the simplification degree and action reliability of the mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a structural schematic view of the short-circuit protection mechanism of the circuit breaker provided by the utility model. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the utility model.

[0016] As Figure 1 shown, the application provides a short-circuit protection mechanism of a circuit breaker, which comprises a magnetic yoke 1, an elastic element 2, an armature 3 and a trigger assembly 4.

[0017] Specifically, the magnetic yoke 1 generates a magnetic field when a short-circuit current passes. The elastic element 2 is arranged at one end of the top of the magnetic yoke 1. The armature 3 is arranged close to the top of the magnetic yoke 1, one end of the armature 3 is connected with the elastic element 2, and the armature 3 is kept in a separated state from the magnetic yoke 1 by the action of the elastic element 2. The trigger assembly 4 is arranged close to the armature 3, when the short-circuit current passes through the magnetic yoke 1, the armature 3 is attracted to the magnetic yoke 1 due to the action of the magnetic field, and drives the trigger assembly 4 to perform the breaking operation of the circuit breaker.

[0018] Through the above arrangement, a quick and automatic response to short-circuit fault tripping protection mechanism is realized, and the response speed and reliability of the circuit breaker are improved. The elastic element 2 ensures that the armature 3 is always in the separated position under the non-short-circuit state, thereby avoiding the occurrence of false actions. At the same time, the structure design is simple, and the number of components is small, which helps to reduce the manufacturing cost and improve the overall stability. In addition, the technical path of triggering the circuit breaker action without the coil structure is realized, avoiding the complexity of coil power supply, insulation and magnetic circuit cooperation in the traditional electromagnetic tripping structure, further improving the degree of mechanism simplification and action reliability.

[0019] The short-circuit protection mechanism further includes a static contact 5, a dynamic contact 6, and an assembly groove 7. The magnetic yoke 1 is connected with the static contact 5, and the magnetic yoke 1 and the static contact 5 are both arranged in the assembly groove 7; the dynamic contact 6 is arranged at the bottom of the trigger assembly 4; one end of the static contact 5 is connected with the terminal 100 of the circuit breaker, and the other end can be matched with the dynamic contact 6. By arranging the assembly groove 7 to integrate the magnetic yoke 1 and the static contact 5, not only the compactness of the structure is improved, but also the standardization and modularization design of the whole short-circuit protection mechanism is facilitated, which is convenient for assembly and maintenance. This structure helps to improve the stability of the electrical connection between the contacts and enhances the anti-vibration performance of the whole system. At the same time, since the dynamic contact 6 is fixed at the bottom of the trigger assembly 4, it can accurately drive the dynamic contact 6 to disconnect when the trigger assembly 4 acts, improving the consistency and action reliability of the circuit breaker response.

[0020] Further, the trigger assembly 4 includes a rotating shaft 41, a rotating piece 42, and a lock catch 43, the rotating shaft 41 is rotationally arranged in the housing of the circuit breaker, the rotating piece 42 is rotationally arranged on the rotating shaft 41, the lock catch 43 is arranged on the rotating piece 42 and can be matched with the armature 3, and the dynamic contact 6 is arranged at the bottom of the rotating piece 42. When the short-circuit current passes through the magnetic yoke 1, the armature 3 is attracted to the magnetic yoke 1 due to the magnetic field, and the armature 3 pushes the lock catch 43 to separate the dynamic contact 6 from the static contact 5. By effectively combining the magnetic field triggering action and the mechanical rotation action, the complexity of the driving mechanism is simplified while ensuring reliable disconnection. Through the rotating shaft 41-rotating piece 42-lock catch 43 structure, multi-angle adjustment and efficient motion transmission can be realized, improving the mechanical efficiency and response speed of the trigger mechanism. The lock catch 43 structure makes the energy conversion path of the armature 3 more direct, thereby reducing energy loss and wear and tear, and enhancing the durability of the system. At the same time, this structure design is convenient for assembly and maintenance, which is helpful for batch manufacturing and quick replacement of standardized modules, improving the overall assembly efficiency.

[0021] The short-circuit protection mechanism further comprises a handle device 8 arranged rotatably on the top of the circuit breaker, the handle device 8 is provided with a transmission rod 81, and the top of the rotating member 42 is provided with an arc-shaped slot 44 matched with the transmission rod 81; when the handle device 8 is rotated in a first rotating direction, the transmission rod 81 drives the rotating member 42 to rotate in the first rotating direction around the rotating shaft 41, and the static contact 5 and the dynamic contact 6 are in contact to form an electric contact pair; when the handle device 8 is rotated in a second rotating direction, the transmission rod 81 drives the rotating member 42 to rotate in the second rotating direction around the rotating shaft 41, and the static contact 5 and the dynamic contact 6 are separated. The above arrangement makes the circuit breaker have both automatic short-circuit protection function and manual control breaking capacity, improving the flexibility and safety of use. The handle device 8 controls the contact state by mechanical transmission, which can manually cut off the power during circuit maintenance or maintenance, improving the operation safety. The arrangement of the arc-shaped slot 44 makes the transmission rod 81 keep a stable movement path during the whole rotation process, avoiding shaking or falling off, and improving the reliability and durability of the structure.

[0022] Further, the assembly groove 7 is made of light insulating material, which can significantly improve the overall insulation performance of the circuit breaker and enhance the safety of the product. Lightweight material helps to reduce the weight of the circuit breaker, reduce transportation and installation cost, and improve the anti-seismic performance and installation flexibility of the equipment. The light insulating material can include polycarbonate, nylon 66, polyester resin, epoxy resin reinforced glass fiber and the like, which is selected according to different requirements of voltage grade, use environment (such as high humidity, high temperature) and mechanical load.

[0023] Further, the elastic element 2 is provided with a fixed shaft 21 arranged in the housing of the circuit breaker. The fixed shaft 21 can position the elastic element 2, which can significantly improve the stability and repeatability of the element installation, and avoid misoperation or slow action caused by installation deviation or looseness.

[0024] Further, the elastic element 2 is a torsion spring, so that its torsional deformation in the circumferential direction has higher fatigue resistance than linear springs. At the same time, the torsion spring can accurately control the spring force by adjusting parameters such as the number of turns, wire diameter and arm length, so as to finely adjust the action threshold of the armature 3 and improve the sensitivity and reliability of the circuit breaker. In addition, the torsion spring structure can quickly recover to the original position after being stressed, which helps to improve the repeated use performance and overall life of the system.

[0025] The above is the description of the embodiments of the present application, through the above description of the disclosed embodiments, the skilled in the art can realize or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will be consistent with the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A short-circuit protection mechanism of a circuit breaker, characterized by comprising: The short-circuit protection mechanism comprises a magnetic yoke (1) which generates a magnetic field when a short-circuit current passes through; an elastic element (2) which is arranged at one end of the top of the magnetic yoke (1); an armature (3) which is arranged close to the top of the magnetic yoke (1), one end of the armature (3) is connected with the elastic element (2) and is kept separated from the magnetic yoke (1) by the action of the elastic element (2); a trigger assembly (4) which is arranged close to the armature (3); when a short-circuit current passes through the magnetic yoke (1), the armature (3) is attracted to the magnetic yoke (1) due to the magnetic field and drives the trigger assembly (4) to perform the breaking operation of the circuit breaker. The short-circuit protection mechanism further comprises a stationary contact (5), a movable contact (6) and an assembly groove (7); the magnetic yoke (1) is connected with the stationary contact (5), the magnetic yoke (1) and the stationary contact (5) are both arranged in the assembly groove (7); the movable contact (6) is arranged at the bottom of the trigger assembly (4); one end of the stationary contact (5) is connected with the terminal (100) of the circuit breaker, the other end can cooperate with the movable contact (6). The trigger assembly (4) comprises a rotating shaft (41), a rotating piece (42) and a lock catch (43); the rotating shaft (41) is rotatably arranged in the housing of the circuit breaker; the rotating piece (42) is rotatably arranged on the rotating shaft (41); the lock catch (43) is arranged on the rotating piece (42) and can cooperate with the armature (3); the movable contact (6) is arranged at the bottom of the rotating piece (42); when a short-circuit current passes through the magnetic yoke (1), the armature (3) is attracted to the magnetic yoke (1) due to the magnetic field, the armature (3) pushes the lock catch (43) to make the movable contact (6) separated from the stationary contact (5). The short-circuit protection mechanism further comprises a handle device (8) which is rotatably arranged at the top of the circuit breaker; the handle device (8) is provided with a transmission rod (81); the top of the rotating piece (42) is provided with an arc-shaped groove (44) which cooperates with the transmission rod (81); when the handle device (8) is rotated along a first rotating direction, the transmission rod (81) drives the rotating piece (42) to rotate along the first rotating direction around the rotating shaft (41), the stationary contact (5) and the movable contact (6) are in contact to form an electric contact pair; when the handle device (8) is rotated along a second rotating direction, the transmission rod (81) drives the rotating piece (42) to rotate along the second rotating direction around the rotating shaft (41), the stationary contact (5) and the movable contact (6) are separated. The assembly groove (7) is made of light insulating material. The elastic element (2) is provided with a fixing shaft (21) which is arranged in the housing of the circuit breaker.

2. The short-circuit protection mechanism of claim 1, wherein The elastic element (2) is a torsion spring.

3. The short-circuit protection mechanism of claim 2, wherein ​ 4. The short-circuit protection mechanism of claim 3, wherein ​ 5. The short-circuit protection mechanism of claim 2, wherein, ​ 6. The short circuit protection mechanism for circuit breakers of claim 1, wherein, ​ 7. The short-circuit protection mechanism of claim 1, wherein ​

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