Arc-extinguishing device of breaker

Abstract

The invention discloses an arc-extinguishing device of a breaker. The arc-extinguishing device comprises an arc extinguish chamber device and an arc insulating device. The arc insulating device includes two flash barriers; and the arc extinguish chamber device includes a plurality of arc-extinguishing grid plates that are arranged between the two flash barriers at a uniform interval. Besides, the arc-extinguishing device is characterized in that air dispersion holes that are in a latticed shape are opened on each of the flash barriers. According to the invention, local air pressures inside the arc-extinguishing device can be effectively reduced when a breaker is broken; and an arc blow-out effect can be enhanced. When the provided arc-extinguishing device is applied to a breaker, working stability of the breaker can be effectively improved and cost can be saved.

Description

technical field [0001] The invention relates to an arc extinguishing device for a circuit breaker. Background technique [0002] At present, the arc extinguishing device of the circuit breaker mainly includes two parts: the arc extinguishing chamber device 1 and the arc isolation device 2. figure 1 , figure 2 As shown, the arc isolation device 2 mainly includes two arc isolation plates 2a (only one arc isolation plate can be seen in the figure), and the arc extinguishing chamber device 1 mainly includes two arc isolation plates 2a evenly spaced between them. A number of arc extinguishing grids 1a. The two sides of the arc extinguishing grid 1a are usually fixed on the inner wall of the arc extinguishing chamber housing 1b, and the bottom of the two arc extinguishing plates 2a are usually connected into one body through the bottom plate 2b, and the static contact connecting plate 2c is added on the bottom plate 2b to connect with the arc extinguishing The chamber device 1...

AI Technical Summary

Problems solved by technology

[0003] However, the current above-mentioned circuit breaker arc extinguishing device has the following disadvantages in use: since there is no additional air diffuser hole on the arc shield 2a, the arc blowing effect is poor, In this way, when the circuit breaker is broken, the high heat generated by the arc will cause the air pressure in the local space in the arc extinguishing device to increase sharply, and when it reaches a certain value, the circuit breaker shell will burst, which not only cannot effectively improve the breaking performance of the circuit breaker, Even damage the circuit breaker

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