Arc extinguishing chamber for miniature circuit breaker

Abstract

The invention discloses an arc extinguishing chamber for a small circuit breaker, which comprises two fixing plates and several arc extinguishing grids arranged between the two fixing plates, and several sets of fixing mechanisms are evenly distributed on the fixing plates. The fixing mechanism includes several fixing holes. The arc extinguishing grid includes an air inlet, an air outlet and two side ends. An inwardly shrinking gas outlet channel is formed between the gas outlet ends of two adjacent arc extinguishing grids, and a fixed right angle is respectively provided on the two side ends of the arc extinguishing grid on the side close to the gas outlet, and on the fixed right angle A fixing block matched with the fixing hole is provided at a position corresponding to the fixing hole, and one end of the fixing block passes through the corresponding fixing hole. The invention has reasonable structural design, convenient and quick installation, can effectively avoid the phenomenon that metal particles in the arc free steam are easy to return to the arc extinguishing chamber, and can effectively improve the arc cooling rate at the same time.

Description

technical field [0001] The invention relates to the technical field of circuit breakers, in particular to an arc extinguishing chamber for a small circuit breaker. Background technique [0002] Arc is a kind of gas discharge phenomenon, which is the instantaneous spark generated by the current passing through a certain medium (such as air). In daily life, when the passing current exceeds the limit value set by the circuit breaker, the circuit breaker will automatically interrupt the current. After the contacts on the circuit breaker are disconnected, the arc will be ignited. Equipment lines cause damage, and even affect personal safety. Therefore, arc extinguishing is one of the important applications of circuit breakers. At present, arc extinguishing methods commonly used in the prior art include a mechanical arc extinguishing method, a magnetic blowing arc extinguishing method, a narrow slit arc extinguishing method and a grid arc extinguishing method. [0003] Among th...

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Problems solved by technology

However, the overall structure of the arc extinguishing chamber is relatively complicated, which is not suitable for the use of small circuit breakers, and because the air holes on the arc extinguishing plate are straight-through design, the force generated by the induced magnetic field of the free grid may be ejected from the arc injection port When the arc is pulled back into the arc extinguishing chamber, the metal particles contained in the arc fre

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