Arc extinguishing mechanism of circuit breaker

Abstract

The utility model discloses an arc extinguishing mechanism of a circuit breaker, which comprises a casing, an arc extinguishing chamber is arranged in the casing, the casing is respectively provided with an upper retaining wall, a lower retaining wall and a side retaining wall in the circumferential direction of the arc extinguishing chamber, one end of the lower retaining wall is arranged close to the side retaining wall, and the other end of the lower retaining wall is arranged close to the side retaining wall. One end of the lower retaining wall is inclined to the upper retaining wall, the other end of the lower retaining wall is inclined to the upper retaining wall and is combined with the upper retaining wall to form an arc striking port for mounting a static contact arc striking sheet, the lower retaining wall is also matched with a moving contact arc striking sheet, the moving contact arc striking sheet comprises a fitting part, an upper folding part, a lower folding part and a connecting part which are sequentially connected, the fitting part is attached to the lower retaining wall, and the connecting part is used for being connected with a bimetallic strip. The included angle formed at the connecting position of the upper folding part and the lower folding part is smaller than 5 degrees, a guide wall is arranged at the position, corresponding to the lower folding part, in the machine shell, and the lower folding part is attached to the guide wall. The arc extinguishing device is simple in structure and better in arc striking effect, can perform more sufficient arc extinguishing, and has a good use effect.

Description

Technical Field

[0001] This utility model relates to an arc-extinguishing mechanism for a circuit breaker. Background Technology

[0002] The arc-extinguishing chamber plays a crucial role in circuit breakers. When a circuit breaker breaks a circuit, an electric arc is generated between the contacts. The arc-extinguishing chamber can quickly extinguish the arc by using a special arc-extinguishing medium and structure to cool, diffuse, and elongate the arc, causing ion recombination. After the arc is extinguished, the arc-extinguishing chamber can also prevent it from reigniting and quickly restore the insulation strength between the contacts. At the same time, it can protect the contacts and equipment from erosion and damage caused by the high temperature and strong electric field generated by the arc. In addition, the performance of the arc-extinguishing chamber affects the breaking capacity of the circuit breaker. Optimization can ensure that the circuit breaker can reliably break high-current and high-voltage circuits. However, existing arc-extinguishing chambers have poor arc-initiating effects, and the arc cannot effectively travel to the arc-extinguishing chamber, affecting the arc-extinguishing effect and the overall structural performance. Utility Model Content

[0003] In view of the shortcomings of the existing technology, this utility model provides an arc extinguishing mechanism for a circuit breaker, which has a simple structure, better arc ignition effect, can perform more complete arc extinguishing, and has good performance.

[0004] To achieve the above objectives, this utility model provides an arc-extinguishing mechanism for a circuit breaker, including a housing. An arc-extinguishing chamber is disposed within the housing. An upper baffle wall, a lower baffle wall, and a side baffle wall are respectively disposed around the arc-extinguishing chamber. One end of the lower baffle wall is positioned close to the side baffle wall, and the other end is inclined upwards towards the upper baffle wall, forming an arc-initiating opening for mounting a stationary contact arc-initiating plate. A moving contact arc-initiating plate is also fitted onto the lower baffle wall. The moving contact arc-initiating plate includes a sequentially connected fitting portion, an upper fold portion, a lower fold portion, and a connecting portion for connecting with a bimetallic strip. The fitting portion is attached to the lower baffle wall. The included angle formed at the connection point of the upper fold portion and the lower fold portion is less than 5°. A guide wall is disposed in the housing corresponding to the position of the lower fold portion, and the lower fold portion is attached to the guide wall.

[0005] The beneficial effects of this design are as follows: When the circuit breaker performs a circuit breaking operation, an electric arc is generated. At this time, the moving contact arc-inducing plate structure, through the slight angle formed between the upper and lower folds, creates a compact and efficient small arc-extinguishing space. Within this space, the arc is effectively confined, greatly reducing the possibility of leakage. Simultaneously, the guide wall located inside the casing at the corresponding position of the lower fold, working closely with the lower fold, further precisely guides the arc's trajectory, ensuring that the arc is efficiently introduced into the arc-extinguishing chamber for complete arc extinguishing. This simple structure guarantees arc extinguishing effectiveness from multiple dimensions, significantly improving the circuit breaker's safety performance and operational stability. Whether under normal operating conditions or in complex and harsh power environments, it can reliably achieve circuit breaking, providing a solid guarantee for the safe and stable operation of the power system.

[0006] As a further feature of this utility model, a baffle is provided in the housing corresponding to the arc-starting position, and the baffle is arc-shaped.

[0007] The beneficial effects of this design are as follows: When the circuit breaker interrupts the circuit and generates an arc, the baffle, with its arc-shaped structure, can tightly fit above the arc inlet, effectively sealing off the entire arc-extinguishing space in the vertical direction. This prevents the arc from escaping from the top of the arc-extinguishing space, strictly confining the arc within a specific arc-extinguishing area. This guides the arc more fully into the arc-extinguishing chamber, greatly improving the efficiency and success rate of arc extinguishing, and effectively ensuring the safe and stable operation of the circuit breaker.

[0008] As a further feature of this invention, an arc guide plate is provided in the housing at the opening of the arc extinguishing chamber. The arc guide plate is provided with a plurality of arc-initiating flanges for guiding the electric arc into the arc extinguishing chamber. The arc-initiating flanges are arranged in an arc shape.

[0009] The advantages of this design are as follows: The guide plate, acting as the base carrier, provides a stable attachment surface for the arc-starting flange, making its machining easier. During production, focus can be placed first on the standardized machining of the guide plate, and then the arc-starting flange can be precisely installed on it according to design requirements, achieving modular production. This not only significantly improves production efficiency but also facilitates quality control. In the assembly stage, the modular design makes the installation of each component clearer and more convenient, greatly reducing assembly difficulty and time costs, and effectively ensuring the product's production schedule.

[0010] As a further feature of this invention, the arc guide plate consists of two pieces, and the arc guide plate is provided with a positioning platform for positioning the stationary contact arc-inducing piece, and the positioning platform is provided with a positioning hole.

[0011] The advantages of this design are as follows: This configuration, using the positioning platform and positioning holes, allows for precise and secure fixing of the stationary contact arc-inducing plate, effectively preventing displacement, shaking, or other instability during equipment operation and greatly ensuring the stability of the stationary contact arc-inducing plate's position. Furthermore, during installation, workers simply place the stationary contact arc-inducing plate onto the positioning platform and fix it through the positioning holes; the operation process is simple and clear, greatly improving the convenience of installation and effectively saving installation time and labor costs. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0013] Figure 2 This is a partially enlarged view of the connection position between the arc guide plate and the stationary contact arc-inducing plate in an embodiment of this utility model. Detailed Implementation

[0014] This utility model provides an embodiment of an arc-extinguishing mechanism for a circuit breaker, such as... Figures 1 to 2 As shown, the device includes a housing 1, in which an arc-extinguishing chamber is provided. The housing 1 has an upper baffle wall 11, a lower baffle wall 13, and a side baffle wall 12 arranged circumferentially around the arc-extinguishing chamber. One end of the lower baffle wall 13 is positioned close to the side baffle wall 12, and the other end is inclined towards the upper baffle wall 11, forming an arc-initiating opening for mounting a stationary contact arc-initiating plate. A moving contact arc-initiating plate 3 is also fitted onto the lower baffle wall 13. The moving contact arc-initiating plate 3 includes a sequentially connected fitting portion 31, an upper fold portion 32, a lower fold portion 33, and a connecting portion 34 for connecting with a bimetallic strip. The fitting portion 31 is attached to the lower baffle wall 13. The included angle formed at the connection point of the upper fold portion 32 and the lower fold portion 33 is 2.7°. A guide wall 15 is provided in the housing 1 corresponding to the position of the lower fold portion 33, and the lower fold portion 33 is attached to the guide wall 15. The beneficial effects of this design are as follows: When the circuit breaker performs a circuit breaking operation, an electric arc is generated. At this time, the moving contact arc-inducing plate 3 structure, through the slight angle formed between the upper fold 32 and the lower fold 33, creates a compact and efficient small arc-extinguishing space. Within this space, the arc is effectively confined, greatly reducing the possibility of leakage. Simultaneously, the guide wall 15 located inside the housing 1 at the position corresponding to the lower fold 33, closely cooperates with the lower fold 33, further precisely guiding the arc's trajectory and ensuring that the arc is efficiently introduced into the arc-extinguishing chamber for complete arc extinguishing. This simple structure ensures arc extinguishing effectiveness from multiple dimensions, significantly improving the circuit breaker's safety performance and operational stability. Whether under normal operating conditions or in complex and harsh power environments, it can reliably achieve circuit breaking, providing a solid guarantee for the safe and stable operation of the power system.

[0015] As a further feature of this embodiment, a baffle 14 is provided in the housing 1 at the position corresponding to the arc initiation port. The baffle 14 is arc-shaped. The beneficial effect of this design is that when the circuit breaker interrupts the circuit and generates an arc, the baffle 14, due to its arc-shaped structure, can tightly fit above the arc initiation port, effectively blocking the entire arc-extinguishing space in the vertical direction. This prevents the arc from escaping from the top of the arc-extinguishing space, strictly confining the arc within a specific arc-extinguishing area, thereby guiding the arc more fully into the arc-extinguishing chamber, greatly improving the efficiency and success rate of arc extinguishing, and effectively ensuring the safe and stable operation of the circuit breaker.

[0016] As a further feature of this embodiment, an arc guide plate 4 is provided in the housing 1 at the opening of the arc-extinguishing chamber. The arc guide plate 4 has several arc-shaped ignition flanges 41 for guiding the electric arc into the arc-extinguishing chamber. The advantages of this design are: the arc guide plate 4, as the base carrier, provides a stable attachment plane for the arc-extinguishing flanges 41, making their processing easier. During production, the arc guide plate 4 can be standardized first, and then the arc-extinguishing flanges 41 can be precisely installed on it according to design requirements, achieving modular production. This not only significantly improves production efficiency but also facilitates quality control. In the assembly stage, the modular design makes the installation of each component clearer and more convenient, greatly reducing assembly difficulty and time costs, and effectively ensuring the product's production schedule.

[0017] As a further feature of this embodiment, the arc guide plate 4 consists of two pieces, each equipped with a positioning platform 42 for positioning the stationary contact arc-inducing piece. The positioning platform 42 has positioning holes. The advantages of this design are: by using the positioning platform 42 and positioning holes, the stationary contact arc-inducing piece can be accurately and firmly fixed, effectively preventing displacement, shaking, or other instability during equipment operation, thus greatly ensuring the stability of the stationary contact arc-inducing piece's position. Furthermore, during installation, the operator only needs to place the stationary contact arc-inducing piece onto the positioning platform 42 and fix it through the positioning holes; the operation process is simple and clear, greatly improving the convenience of installation and effectively saving installation time and labor costs.

[0018] The above examples are merely one preferred embodiment of this utility model. Ordinary variations and substitutions made by those skilled in the art within the scope of this utility model's technical solution are all included within the protection scope of this utility model.

Claims

1. An arc-extinguishing mechanism for a circuit breaker, comprising a housing, wherein an arc-extinguishing chamber is disposed within the housing, and an upper baffle wall, a lower baffle wall, and a side baffle wall are respectively disposed around the arc-extinguishing chamber, characterized in that: One end of the lower baffle wall is located near the side baffle wall, and the other end is inclined to the upper baffle wall and combined with the upper baffle wall to form an arc-inducing opening for mounting the stationary contact arc-inducing plate. The lower baffle wall is also fitted with a moving contact arc-inducing plate. The moving contact arc-inducing plate includes a bonding part, an upper folding part, a lower folding part, and a connecting part for connecting with a bimetallic strip, which are connected in sequence. The bonding part is attached to the lower baffle wall. The included angle formed at the connection between the upper folding part and the lower folding part is less than 5°. A guide wall is provided in the housing corresponding to the position of the lower folding part, and the lower folding part is attached to the guide wall.

2. The arc-extinguishing mechanism of the circuit breaker according to claim 1, characterized in that: A baffle is provided in the housing at the position corresponding to the arc inlet, and the baffle is arc-shaped.

3. The arc-extinguishing mechanism of the circuit breaker according to claim 1, characterized in that: An arc guide plate is provided in the housing at the opening of the arc extinguishing chamber. The arc guide plate is provided with a plurality of arc-initiating flanges for guiding the electric arc into the arc extinguishing chamber. The arc-initiating flanges are arranged in an arc shape.

4. The arc-extinguishing mechanism of the circuit breaker according to claim 3, characterized in that: The guide plate consists of two pieces, and the guide plate is provided with a positioning platform for positioning the stationary contact arc-inducing piece, and the positioning platform is provided with a positioning hole.

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