A retractable arc extinguishing mechanism for a power circuit breaker

Abstract

The invention belongs to the technical field of power circuit breakers, and especially relates to a shrinkage-type arc extinguishing mechanism for a power circuit breaker. The mechanism comprises an air cylinder, a push rod, a swinging rod, a power fixed end, an electric car guide plate, outer plates, inner plates, a fin, and a piston, wherein the swinging rod and the power fixed end are separated to generate an arc, and the arc moves to the fin. Meanwhile, the swinging rod pushes the piston to compress air to enter an air channel which is formed by the first outer and first inner plates and the second outer and inner plates, and the air flows into a cavity formed by the first and second inner plates through an air hole. When the arc makes contact with the fin, an insertion piece of the fin enables the arc to be isolated, and the discharged air carries out the cooling of the fin and the arc. The two sides can enable the arc to be fully cooled, and to be quickly distinguished. In addition, the insertion piece at the rear end of the fin can prevent arcs from joining together again, and enables the separated arcs to be further isolated by the fin at the rear end. The mechanism is better in use effect.

Description

Technical field [0001] The invention belongs to the technical field of power circuit breakers, in particular to a retractable arc extinguishing mechanism of a power circuit breaker. Background technique [0002] A power circuit breaker is a switch that protects the short circuit, overload and leakage of the circuit in the electric power. It can cut off the circuit when the circuit short circuit, overload and leakage occur. The circuit is connected or closed. A high-temperature and high-heat arc will be generated between the moving contact and the static contact. If the arc cannot be quickly exported and extinguished, it will ablate the contact point between the two contacts and cause serious damage to the power circuit breaker shell. Large damage, more importantly, the arc will delay the disconnection of the circuit, causing irreparable losses; Short circuit is very important. In order to further increase the extinguishing effect on the sudden large current arc, it is nece...

AI Technical Summary

Problems solved by technology

[0002] A power circuit breaker is a switch that protects the short circuit, overload and leakage of the circuit in the electric power. It can cut off the circuit when the circuit short circuit, overload and leakage occur. The circuit is connected or closed. A high-temperature and high-heat arc will be generated between the moving contact and the static contact. If the arc cannot be quickly exported and extinguished, it will ablate the contact point between the two contacts and cause serious damage to the power circuit breaker shell. Large damage, more importantly, the arc will delay the disconnection of the circuit, causing irreparable losses; Short circuit is very important

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