Breaking device

Abstract

The invention relates to a breaking device, which comprises an arc extinguishing chamber assembly and a moving contact assembly, and further comprises a gas circulation channel by using the moving area of the moving contact assembly as a contact area, wherein the gas circulation channel can guide at least one part of gas flow rushed out from the arc extinguishing chamber assembly back to the contact area. According to the invention, after the air flow is cooled and the insulating strength is recovered in the flowing process, the arc is further pushed to move to the arc extinguishing chamber, and the insulating medium strength of the contact area is enhanced due to the fact that the air insulating strength of the air flow is recovered, so that the contact area is not easily ionized and broken down by voltages at two ends of the contact, and arc reignition is prevented.

Description

technical field [0001] The invention relates to a breaking device, in particular to the improvement of the arc extinguishing system therein. Background technique [0002] A circuit breaker generally includes a base, a static contact, a moving contact and an arc extinguishing chamber. When the circuit breaker is disconnected, an arc is generated between the moving and static contacts, and the arc is extinguished by the arc extinguishing chamber, and the free gas is discharged from the arc extinguishing chamber. To the outside of the base, in this conventional structure, since the arc is discharged from the product outside the arc extinguishing chamber, the pressure in the contact area (the moving area of ​​the moving contact) is reduced, and the arc is easy to return to the contact under the action of the external atmospheric pressure In the contact area, re-ignition occurs, which affects the arc extinguishing ability of the product; moreover, after arcing in the contact area...

AI Technical Summary

Problems solved by technology

[0002] A circuit breaker generally includes a base, a static contact, a moving contact and an arc extinguishing chamber. When the circuit breaker is disconnected, an arc is generated between the moving and static contacts, and the arc is extinguished by the arc extinguishing chamber, and the free gas is discharged from the arc extinguishing chamber. To the outside of the base, in this conventional structure, since the arc is discharged from the product outside the arc extinguishing chamber, the pressure in the contact area (the moving area of ​​the moving contact) is reduced, and the arc is easy to return to the contact under the action of the external atmospheric pressure In the contact area, re-ignition occurs, which affects the arc extinguishing ability of the product; moreover, after arcing in the contact area, the temperature is relatively high, and the degree of gas dissociation is relatively high. Under the action of the electric field generated by the power supply voltage at both ends of the contact, the gas is easy to re- Ionization breakdown, resulting in arc reignition and breaking failure

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