A DC circuit breaker arc extinguishing device

Abstract

The invention provides an arc extinguishing device for direct current breakers. An arc extinguish chamber is mounted on a second case body and is provided with a side opening which is opposite to a first case body; a gas generating cover is mounted at a lower part inside the arc extinguish chamber and comprises two gas generating plates which are oppositely arranged and a baffle plate; the baffle plate is opposite to the side opening and is arranged closely to the second case body; a moving contact and a fixed contact are mounted inside an installing space; the breaking position is inside a hold space and is close to the baffle plate; when arc is generated during the breaking of the moving contact and the fixed contact, the gas generating plate and the baffle plate are triggered by the arc, and large quantity of gas is generated to push the arc to move in a direction away from the baffle plate; one side, facing the hold space, of arc extinction chute plates installed at the upper side of the inside of the arc extinguish chamber is provided with a lower part opening; the lower part opening is tapering in the direction from the second case body to the first case body; the arc is blocked by the arc extinction chute plates with tapering lower part opening continuously during movement so that the arc cannot rush out from the side opening of the arc extinguish chamber but can only enter the space between the arc extinction chutes and be extinguished as soon as possible.

Description

technical field [0001] The invention relates to the technical field of arc extinguishing for a DC circuit breaker, in particular to an arc extinguishing device for a DC circuit breaker. Background technique [0002] Low-voltage circuit breaker is an important power transmission and distribution electrical component, which plays an important role in distributing electric energy and protecting equipment and personnel safety in the line. Low-voltage circuit breakers can be divided into AC circuit breakers and DC circuit breakers according to their use systems. Under normal working conditions, the low-voltage circuit breaker realizes the distribution and control of the electrical load by closing or opening the contacts. When a fault occurs in the line, the circuit breaker detects the fault signal, and the release operates to break the contacts and disconnect the faulty line. When a short-circuit fault occurs in the line, when breaking the short-circuit current, quickly extingu...

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the arc extinguishing device in the prior art by adding a baffle plate between the first housing and the upper port of the arc extinguishing chamber, which shortens the moving distance of the arc in the arc extinguishing chamber, resulting in Can not make full use of most of the arc extinguishing grids, so that the arc is not easy to extinguish the technical defect, so as to provide a DC circuit breaker arc extinguishing device that can not only protect the shell, but also make full use of most of the arc extinguishing grids to improve the arc extinguishing effect

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