Arc extinguishing chamber and circuit breaker

Abstract

The invention provides an arc extinguishing chamber and a circuit breaker. The arc extinguishing chamber comprises a base, a middle seat arranged on the base, and a cover body covering the base and the middle seat. Arc extinguishing sheets are arranged perpendicularly to the base, an arc extinguishing gap is formed between each two adjacent arc extinguishing sheets, an arc blocking rib set used for blocking the arc extinguishing gaps is arranged at one end, away from a magnetic support, of the middle seat, and an upper layer arc blocking rib and a lower layer arc blocking rib block upper portions and lower portions of the two adjacent arc extinguishing gaps respectively. An arc can pass through each arc extinguishing gap to form an arc extinguishing channel. A tail end of each arc extinguishing sheet is not completely blocked. The tail end of each arc extinguishing sheet is blocked through the upper layer arc blocking rib and the lower layer arc blocking rib which are staggered with each other. Therefore, only an upper part or a lower part of each arc extinguishing gap is blocked, and an arc extinguishing gas flow can be guided to form a connected ventilation channel so that the gas flow is accelerated, the arc can easily move into the arc extinguishing chamber from the magnetic support and move towards the tail part of the arc extinguishing chamber, and extinguishing time of the arc is reduced.

Description

technical field [0001] The invention relates to the technical field of circuit breaker structures, in particular to an arc extinguishing chamber and a circuit breaker. Background technique [0002] For circuit breakers in the prior art, it is generally necessary to set up an arc extinguishing chamber for arc extinguishing. Among them, the arc extinguishing chamber generally adopts a traditional metal grid arc extinguishing chamber, and the arc extinguishing plate on the upper part of the arc extinguishing chamber and the surrounding area use a melamine layer. platen. When an arc occurs, the melamine laminate is heated to release a gas that helps extinguish the arc. Several holes of equal size are punched out of the laminated plate of the arc extinguisher on the upper part of the arc extinguishing chamber, and the airflow and heat are released through the holes, so as to achieve the purpose of arc extinguishing. [0003] However, the arc extinguishing channel in the existin...

AI Technical Summary

Problems solved by technology

[0003] However, the arc extinguishing channel in the existing arc extinguishing chamber is generally located at the tail of the arc extinguishing chamber. At this time, regardless of the size of the buffer space outside the arc extinguishing chamber, it generally only passes through the raised ribs on the casing and the extinguishing channel. The splint on the outer edge of the arc extinguisher is shielded, and the distance between the protruding ribs on the shell and the splint on the outer edge of the arc extinguisher and the arc extinguishing sheet is not equal, resulting in uneven spatial distribution of the buffer zone, and there are buffer zones in some areas. The air flow channel is not smooth. If the tail of the arc extinguishing chamber is completely covered, it will make it difficult for the arc to enter the arc extinguishing chamber. The utilization efficiency of the arc extinguishing chamber is low, and the arc entering the arc extinguishing chamber may also have the phenomenon of back breakdown. , thereby reducing the breaking performance of the circuit breaker

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