Arc extinguishing mechanism for circuit breaker, and circuit breaker

Abstract

The invention discloses an arc extinguishing mechanism for a circuit breaker, and the circuit breaker. The arc extinguishing mechanism for the circuit breaker comprises: a shell; an arc extinguishingchamber arranged in the shell; and an arc striking structure arranged in the shell and positioned on one side, close to a contact mechanism, of the arc extinguishing chamber, wherein the arc strikingstructure comprises a plurality of arc striking protrusions and a plurality of arc striking grooves, the arc striking protrusions extend towards the arc extinguishing chamber to guide an electric arc,the arc striking grooves are formed in the side portions of the arc striking protrusions and communicate with the arc extinguishing chamber, the arc striking protrusions are provided with a pluralityof communicating parts, and the communicating parts communicate with the arc striking grooves. According to the arc extinguishing mechanism having the structure and used for the circuit breaker, whenan electric arc passes through the arc striking grooves, the electric arc can be rapidly lengthened and divided so as to rapidly lead the electric arc into the arc extinguishing chamber, and the communicating parts are communicated with the different arc striking grooves so as to achieve automatic adjustment of electric arc airflow and balance the movement speed of the electric arc airflow of thedifferent arc striking grooves, so that the arc extinguishing speed is increased, and potential safety hazards are avoided.

Description

technical field [0001] The invention relates to the technical field of low-voltage electrical appliances, in particular to an arc extinguishing mechanism for a circuit breaker and a circuit breaker. Background technique [0002] As an important component of the low-voltage power grid, the low-voltage circuit breaker can quickly break the circuit, especially when there is a short circuit and a large current in the circuit, so as to ensure that the power grid is not damaged. In the process of breaking the current, the low-voltage circuit breaker will generate an arc. If the arc burns on the moving and static contacts for a long time without being introduced into the arc extinguishing chamber, it will cause the failure of breaking the current; even if the arc can be introduced into the arc extinguishing chamber, if If you can't leave the moving and static contacts at a fast speed, it will still cause a lot of burning on the surface of the moving and static contacts, thus affect...

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the slow moving speed of the arc air flow in part of the arc striking groove in the arc extinguishing mechanism of the circuit breaker in the prior art, which slows down the speed of arc extinguishing, so that there is a potential safety hazard. defect, thereby providing an arc extinguishing mechanism for a circuit breaker and a circuit breaker

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