A contact system with automatic arc blowing function

Abstract

The invention discloses a contact system with an automatic arc blowing function. The system comprises a contact supporter and a movable contact which rotates along with the contact supporter in an integrated manner, wherein the movable contact has a maximum distance of separating brake rotating, a baffle is arranged at the front end, which is suitable for being contact with a fixed contact, of the movable contact in a rotating manner, and the baffle is provided with two side plates and an arc blowing plate which is connected between the two side plates and faces an arc extinguishing chamber; the system further comprises an elastic bias device for applying acting force on the baffle in the direction, opposite to the direction of the separating brake rotating of the movable contact; when the movable contact is rotated to a maximum distance position and stops rotating, under the inertia effect, the baffle overcomes the acting force on the elastic bias device to continuously rotate in the original direction, and arcs are blown by the arc blowing plate to move towards the arc extinguishing chamber. Through the use of the system, the air blowing effect is improved, the short circuit breaking capacity of the contact system is improved, and the baffle is reset under the driving of the elastic bias device. The contact system disclosed by the invention has the advantages that the structure is simple and the operation is reliable.

Description

technical field [0001] The invention relates to a circuit breaker contact system, in particular to a contact system with an automatic arc blowing function, and belongs to the technical field of low-voltage electrical accessories. Background technique [0002] The contact system of a low-voltage circuit breaker is prone to arcing when it is broken. Generally, an arc extinguishing chamber is installed above the contact system. The arc extinguishing chamber includes several arc extinguishing grids. There are gaps between adjacent arc extinguishing grids. These gaps It is the main channel for the arc to discharge outward, so the contact system is generally equipped with a baffle, and the opening of the baffle faces the arc extinguishing chamber to prevent the arc from moving in other directions except the direction of the arc extinguishing chamber. [0003] For example, Chinese patent CN202816838U discloses a moving contact of a low-voltage circuit breaker, including a parallel ...

AI Technical Summary

Problems solved by technology

[0007] The problem to be solved by the present invention is that the baffle plate of the existing contact system only plays the role of preventing the arc from moving to both sides of the movable contact and the opposite direction of the arc extinguishing chamber, but cannot accelerate the arc into the arc extinguishing chamber. As a result, there is a problem that the arc cannot enter the arc extinguishing chamber in time and the circuit breaker cannot be broken normally, thus providing a baffle that can prevent the arc from moving to both sides of the moving contact and the opposite direction of the arc extinguishing chamber, and can also accelerate the arc. Contact system with automatic arc blowing function into the arc extinguishing chamber

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