A circuit breaker and its arc extinguishing chamber

Abstract

The invention provides a circuit breaker and an arc extinguishing chamber thereof. The arc extinguishing chamber comprises a movable contact system, a static contact system and an insulating cylinder,wherein the movable contact system is positioned above the insulating cylinder; the static contact system is located below the insulating cylinder; the static contact system comprises a static contact support part (53) with a downstream channel (54); the static contact support part (53) is provided with a plurality of cooling fins (55) arranged in the downstream channel (54), wherein the plurality of cooling fins (55) are uniformly distributed along the circumferential direction of the static contact support part (53), and extend along the axial direction of the static contact support part (53) in the axial direction. The arc extinguishing chamber provided by the invention can improve the breaking capacity of the circuit breaker, and intensive pattern, miniaturization and high parametersof the circuit breaker product can be achieved.

Description

technical field [0001] The invention relates to the technical field of circuit breakers, in particular to a circuit breaker and an arc extinguishing chamber. Background technique [0002] With the rapid development of the power market, the power market has higher and higher requirements for miniaturized, large-capacity, and high-parameter performance products. All switch manufacturers have carried out intensive and miniaturized technical upgrades for existing products. [0003] The arc extinguishing chamber of the circuit breaker includes a moving contact system and a static contact system, and the moving contact system and the static contact system are connected through an insulator, which forms a certain contact interval (that is, the arc extinguishing fracture). When performing short-circuit breaking, the gas at the gap between the fractures rapidly heats up and expands under the action of the arc, and most of the hot gas will be discharged from the downstream channel of ...

AI Technical Summary

Problems solved by technology

When performing short-circuit breaking, the gas at the gap between the fractures rapidly heats up and expands under the action of the arc, and most of the hot gas will be discharged from the downstream channel of the static contact system into the large tank of the arc extinguishing chamber, while the large The hot air flow in the tank can easily cause arc gap breakdown or shell-to-ground insulation breakdown. For this reason, the current circuit breaker arc extinguishing chamber usually chooses to increase the volume and length of the downstream area when designing, but this will lead to open circuit The overall volume of the device is large and the height is high, which is difficult to meet the design requirements of intensive, miniaturized and high parameters

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