Arc control device of circuit breaker

Abstract

The invention discloses an arc control device of a circuit breaker, wherein the arc control device is positioned in a shell of the circuit breaker. The arc control device of the circuit breaker comprises an arc control chamber 2 with an arc control grid sheet and an exhaust chamber 3, wherein the exhaust chamber 3 comprises a shunting cavity 13 and a winding roadway 12; the shell is provided withan exhaust port 11; the winding roadway 12 is communicated with atmosphere outside the circuit breaker; the shunting cavity 13 is communicated with the arc control chamber 2 by an air guidance slot 31; the exhaust chamber 3 separates the winding roadway 12 from the shunting cavity 13 by a shunting piece 32 and two shunting cavity side walls 34; the part, which is positioned in the shunting cavity13, of the shunting piece 32 is distributed in a Y shape and comprises a V-shaped support arm surface and a linear landing leg, the two support arm ends of the V-shaped support arm surface are fixedly connected to the end part of the shunting cavity side walls 34, and the linear landing leg is parallel to the shunting cavity side walls 34 and extends towards the air guidance slot 31 to divide airflow into two parts; and the shunting cavity 13 and the winding roadway 12 are communicated by a shunting cavity air guide port 33. The arc control device can ensure that airflow air pressure requiredfor improving arc blowing speed in the arc control chamber can be maintained, and the cooling path of arcing gas is increased.

Description

technical field [0001] The invention relates to an arc extinguishing device for electrical equipment, especially an arc extinguishing device with an exhaust chamber suitable for low-voltage circuit breakers and other switchgears, and can be applied to various electrical equipment that needs to be extinguished when the arc is switched on and off in an air medium middle. Background technique [0002] During the opening and closing process of low-voltage electrical appliances, especially when breaking a large current, a switching arc will be generated in the air medium. At the beginning, the arc is ignited by the metal vapor of the contact, and then the surrounding air medium gradually enters the arc gap to make the metal phase arc It is transformed into a gas-phase arc supported by free gas. The arc is a mass of high-temperature and high-pressure ionized gas. The arc gas strongly destroys the material of the contact object. Therefore, in recent years, people use grids to extin...

AI Technical Summary

Problems solved by technology

Arc cooling is relatively poor due to the short gas cooling path

Some products have increased the length of the arc exhaust path by deliberately forming curved grooves on the surface of the inner wall of each pole shell to enhance the cooling effect of the arc, such as the patent application CN200580018556.2, but these curved grooves increase The width of each pole circuit breaker case leads to an increase in the volume of the entire product, which does not conform to the development trend of miniaturization

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