Circuit breaker arc extinguishing system for shrinking narrow slit type double-circulation airflow

Abstract

The invention discloses a circuit breaker arc extinguishing system for shrinking narrow slit type double-circulation airflow, which comprises a moving contact, a static contact, an arc extinguishing chamber and an arc striking plate arranged at the inlet part of the arc extinguishing chamber, wherein an arc extinguishing assembly is arranged in the arc extinguishing chamber; the arc extinguishing assembly comprises a group of arc extinguishing grid sheets arranged at intervals and a gas production interlayer arranged between two adjacent arc extinguishing grid sheets, an open groove body is arranged on the arc extinguishing grid sheets close to the front end head part of the inlet part of the arc extinguishing chamber towards the inside of the arc extinguishing chamber, and the open groove body forms a main arc channel; a pair of airflow partition plates are also arranged at the inlet part of the arc extinguishing chamber and are respectively arranged at the two sides of the front end part of the arc extinguishing grid sheet; and a shunt arc channel is arranged between one surface of each airflow partition plate and the outer side of the front end head of the arc extinguishing grid plate, and an overflow arc channel is arranged between the other surface of each arc extinguishing grid plate and the inner wall of the shell of the arc extinguishing chamber. The system can reduce or avoid the production of the arc rebreakdown phenomenon, improve the performance of the circuit breaker and prolong the service life of the circuit breaker.

Description

technical field [0001] The invention relates to the technical field of circuit breakers, in particular to a circuit breaker arc extinguishing system with contracted slit type double-circulation airflow. Background technique [0002] A circuit breaker usually consists of an electromagnetic mechanism, a contact mechanism, an overload trip assembly and an arc extinguishing system, wherein the arc extinguishing system is an important functional component of the circuit breaker. The structure of the arc extinguishing system is mainly composed of a pair of moving and static contacts, an arcing channel, an arc extinguishing chamber and an exhaust channel. When the circuit breaker performs short-circuit current breaking, the arc between the moving and static contact Under the action, it enters the arc extinguishing chamber through the arc striking channel to cool and extinguish, so the performance of the arc extinguishing system directly affects the short-circuit breaking performanc...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above problems, the present invention proposes a circuit breaker arc extinguishing system with narrow slit type double-circulation airflow, which aims to overcome the drawbacks of the circuit breaker arc extinguishing system in the prior art that easily cause arc re-strikes, and improve the performance of the circuit breaker. performance and service life

Images