A rotary multi-finger contact structure

Abstract

The invention discloses a rotary multi-finger contact structure, which includes an upper static contact, a lower static contact and a moving contact system. The moving contact system consists of a contact frame, a first contact finger, a second contact finger, The first moving shaft, the second moving shaft, the first ball shaft, the second ball shaft, the contact spring and the ring disc spring, the first contact finger and the second contact finger are installed on the contact frame, and the ring disc spring Installed in the ball groove, the first ball shaft and the second ball shaft are installed on the disc spring of the ring, and the relative position of the first ball shaft and the second ball shaft to the contact finger can be automatically adjusted through the line contact between the ball and the ring position, the contact spring transmits the spring force to the first contact finger and the second contact finger through the first ball shaft, the second ball shaft, and the ring disc spring, which ensures the consistency of the contact pressure between different fingers and The simultaneity of two fractures of the same stylus. The invention patent not only reduces the electric repulsion force of the moving contact, improves the short-term endurance capacity of the contact, but also increases the effective contact area of ​​the contact and reduces the contact resistance of the contact.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to a novel rotary multi-finger contact structure. Background technique [0002] A circuit breaker is a power distribution device used in the power grid, which can connect, carry and break the current under normal circuit conditions, and can also be used under specified abnormal conditions (such as overload, short circuit, undervoltage and single-phase ground fault) When) switching on, carrying a certain time and breaking current switching devices. With the development of science and technology, people's living standards are improving day by day, the demand for electricity is increasing, and the requirements for circuit breakers that play a protective role in the circuit are also getting higher and higher. It is hoped that the circuit breaker is small in size, light in weight, and can break larger electricity at the same time. . The double breakpoint technology dist...

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Problems solved by technology

[0003] However, the double-breakpoint structure commonly used at present is a rotary single-piece contact, which has the following problems: due to the increase of the fracture, the contact resistance is also doubled, and the problem of temperature rise is difficult to solve; the rotary double-breakpoint structure is relatively ordinary single-piece The electric repulsion force of the breakpoint structure has doubled, making it easier to repel. Although the current limiting effect is good, the short-term tolerance is low. In the environment that requires selective protection, it is difficult to achieve the expected effect because the repulsion is too early; double breakpoints The consistency of the two fractures of the same contact is poor, and the requirements for parts processing and assembly are very high; the falling force of the double breakpoint structure is twice that of the single breakpoint after repelling, and it is more likely to fall and cause the arc to reignite

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