Dynamic arc contact, and installing method and special tool thereof

Abstract

The invention discloses a dynamic arc contact. The dynamic arc contact comprises a tubular contact main body, wherein an outer peripheral face at one end of the contact main body is provided with a contact screw thread used for fixedly connecting a moving contact; the contact main body on the root part of the contact screw thread is provided with a baffle block projecting outwards; the inner hole wall of the contact main body is provided with a conical necked section; a small port end of the necked section faces towards the contact screw thread; and the radial outer surface of the baffle block is provided with a retaining screw thread having the same rotational direction as the contact screw thread. Simultaneously, the invention also discloses an installing method and a special tool for the dynamic arc contact. In the invention, the dynamic arc contact provided with the retaining screw thread is arranged in cooperation with the special tool and the dynamic arc contact is screwed on the moving contact through a friction force between a pressing head at the end of a compression carrier rod and the conical necked section in the dynamic arc contact, so a contact finger of the dynamic arc contact is prevented from being deformed, and the installing quality of the dynamic arc contact is improved. Therefore, the making and breaking performance of a circuit breaker is improved.

Description

technical field [0001] The invention relates to a moving arc contact, in particular to a circuit breaker moving arc contact, and also provides a method for installing the moving arc contact and a special tool used therefor. Background technique [0002] The moving arc contact of the circuit breaker plays the role of carrying the large short-circuit current when the circuit breaker breaks the fault current. Its assembly quality will directly affect the breaking performance of the circuit breaker. In particular, it is necessary to ensure that the contact fingers on the top of the moving arc contact do not out of shape. At present, the installation of moving arc contacts adopts direct installation, such as figure 1 As shown, the moving arc contact includes a tubular contact body 3, the outer surface of one end of the contact body 3 is provided with a contact thread 4 for fixed connection with the moving contact 2, and the contact body at the root of the contact thread 4 A pro...

AI Technical Summary

Problems solved by technology

However, when the moving arc contact is screwed into the threaded hole, only the finger of the moving arc contact protrudes from the moving contact. Since the wall of the finger of the moving arc contact is relatively thin, if a general fastening tool is used for tightening, the applied The clamping force on the outer wall of the moving arc contact needs to be continuously increased with the tightening of the moving arc contact, which will easily cause the deformation of the moving arc contact finger, thus affecting the breaking performance of the circuit breaker

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