Anti-loosening structure and contact assembly and circuit breaker using the structure

Abstract

The invention relates to a loosening prevention structure and a contact assembly and circuit breaker using the same, which are used for solving the problem that a threaded connection structure in the prior art is easy to loosen during switch-on and switch-off of the circuit breaker. In the loosening prevention structure disclosed by the invention, a canted-coil spring is arranged between a first connection element and a second connection element, thus, the canted-coil spring can be pressed by a first push surface or a second push surface to make the canted-coil spring compressed and deformed along a plug-in direction (namely, an axial direction of the first connection element) of the two connection elements and then apply a pre-tightening force, far away from the second connection element along an axial line, to the first connection element during the process that the first connection element is screwed into the second connection element, thread teeth, adapted to each other, of the first connection element and the second connection element can be contact and are engaged by means of the pre-tightening force, and an effect of preventing a thread joint surface from loosening is achieved; and meanwhile, the canted-coil spring is beneficial for enabling relatively uniform force applying and deformation of all positions where the canted-coil spring between the first push surface and the second push surface is arranged, a more uniform pre-tightening force can be provided for the first connection element, and a loosening prevention effect is better.

Description

technical field [0001] The invention relates to an anti-loosening structure and a contact assembly and a circuit breaker using the structure. Background technique [0002] The circuit breaker is used to cut off the overload current and short-circuit current generated when the power system fails. It is the core component of the high-voltage switch, so there are strict requirements on the electrical life and mechanical life of the circuit breaker. During the opening and closing process of the circuit breaker, the opening and closing speed between the dynamic and static contacts of the arc extinguishing chamber is extremely fast, and accordingly the dynamic and static contacts will be subjected to a huge impact load. [0003] The structure of the contact assembly in the prior art is as follows figure 1 As shown, it includes a support 1, the support 1 has an inner cylinder section 11 (that is, a second connector) and an outer cylinder section 12 (that is, a second connector) th...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an anti-loosening structure to solve the problem that the threaded connection structure in the prior art is easy to loose during the opening and closing process of the circuit breaker; the purpose of the present invention is also to provide a contact assembly using the above-mentioned anti-loosening structure and circuit breaker

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