A circuit breaker contact system

Abstract

The invention discloses a contact system of a circuit breaker, which comprises an arc extinguishing cylinder, a moving contact and a static contact. Both the moving contact and the static contact are located in the inner cavity of the arc extinguishing cylinder. The base plate is screwed, the motor is fixedly installed on the bottom of the base plate, the power output end of the motor is fixedly connected to the rotating shaft, the rotating shaft runs through the base plate and extends to the inner cavity of the arc extinguishing cylinder, and the top of the rotating shaft is movably connected with the pressing rod up and down, and the pressing rod The side wall of the moving contact is symmetrically installed, the top of the pressing rod penetrates the arc extinguishing cylinder and extends to the top outside of the arc extinguishing cylinder and fixes the connection knob. The top of the bottom plate is fixedly installed with a fixed plate, and the fixed plate is fixed by a touch spring. The beneficial effects of the invention for connecting the static contacts are: protection measures, high safety; tight connection, not affected by the thickness and elasticity of the contacts; and long service life.

Description

technical field [0001] The invention relates to the technical field of circuit breakers and electrical equipment, in particular to a circuit breaker contact system. Background technique [0002] In the field of low-voltage electrical appliances, the contact is an electrical connection component. Its main function is to control the on-off of the line by contacting or disconnecting the moving contact and the static contact. At present, most of the contact forms of the transfer switch are complicated in structure. Multiple components, or components with complex structures, not only have high production costs, time-consuming and labor-intensive assembly, and are not easy to automate production, but are also prone to connection failures, higher temperature rises, and higher power consumption, which in turn cause the entire machine to fail. Lifespan is not high. [0003] The form of the moving contact disclosed in the national patent CN205487897U, as well as the associated rotary...

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Problems solved by technology

[0002] In the field of low-voltage electrical appliances, the contact is an electrical connection component. Its main function is to control the on-off of the line by contacting or disconnecting the moving contact and the static contact. At present, most of the contact forms of the transfer switch are complicated in structure. Multiple components, or components with complex structures, not only have high production costs, time-consuming and labor-intensive assembly, and are not easy to automate production, but are also prone to connection failures, higher temperature rises, and higher power consumption, which in turn cause the entire machine to fail. lifespan is not high

[0003] The form of the moving contact disclosed in the national patent CN205487897U, as well as the associated rotary isolating switch, includes a moving contact piece and a moving contact piece mounting frame, and the moving contact pieces are paired and relatively arranged on the moving contact piece mounting frame. There is a matching gap for the insertion of the static contact piece. The thickness of the existing moving contact piece is relatively thin so it has better elasticity, so that when the matching gap corresponds to the position of the static contact piece, there is a gap between the moving contact piece and the static contact piece. Better contact stability. In some special cases, in order to ensure that the moving contact has better electrical properties, it is necessary to thicken the thickness of the moving contact. After increasing the thickness of the moving contact, its elasticity is greatly reduced. , it cannot be reset in time after the fit gap becomes larger, which affects the stability of the electrical connection

And it just increases the thickness of the shrapnel, which cannot fundamentally solve the problem, and the structure is also complicated.

[0004] Not only that, there is no corresponding fault protection measure in the contact system of the circuit breaker in the prior art. Sometimes after the contact system is opened, the circuit breaker will be closed again due to some human factors or accidents. In this case Once the switch is closed, it will be dangerous

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