A small circuit breaker with arc extinguishing structure

By designing a vacuum-reducing arc extinguishing structure and arc guide plate in a small circuit breaker, the problems of burning and breaking of the dynamic contacts when the arc enters are solved, and a more efficient and reliable arc extinguishing effect is achieved, improving the applicability and practicality of the circuit breaker.

CN119764138AInactive Publication Date: 2025-04-04杨跃梦
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Patent Information

Application Number
CN202411952024.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-27
Publication Date
2025-04-04
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The arc extinguishing device of existing small circuit breakers is prone to burning the moving contacts and breaking the arc extinguishing grid when the arc is in, affecting the normal use and reliability of the circuit breaker.

Method used

A small circuit breaker with a vacuum-lowering arc extinguishing structure is designed, and a combination of an arc guide plate and an arc extinguishing grid plate is adopted. The arc guide plate includes a C-shaped plate body and a guide portion. Through the vacuum seal and the design of the arc guide plate, the arc ensures that the arc enters the arc guide plate smoothly and is extinguished in the arc extinguishing grid plate.

Benefits of technology

It improves the effect and reliability of arc extinguishing, avoids breakdown damage to the arc extinguishing grid, enhances the short-circuit breaking capability and reliability of the circuit breaker, and is highly applicable and practical.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention discloses a small circuit breaker with an arc extinguishing structure, comprising a housing, a first terminal and a second terminal fixed on the housing, a static contact connected to the first terminal and a moving contact connected to the second terminal fixed in the housing, an operating handle connected to the moving contact arranged on the housing, an arc extinguishing grid fixed in the housing, an arc guide plate arranged between the arc extinguishing grid and the moving contact, the arc guide plate comprising a connecting portion and a guiding portion, a wave-shaped convex pattern integrally formed on the inner wall of a C-shaped plate body, a middle portion of the C-shaped plate body connected to the moving contact through a pin shaft, a lower half glass shell sealed and fixed on the static contact, and an upper half glass shell sealed and fixed on the moving contact. The present invention has a reasonable structural arrangement, is conducive to improving the arc extinguishing effect, is conducive to improving the arc extinguishing reliability, and can also prevent the arc extinguishing grid from being broken down and damaged, is conducive to improving the short-circuit breaking capacity and reliability of the circuit breaker, has strong applicability and good practicality.
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