Electric switch device

Abstract

The invention discloses an electric switch device which comprises a base and a contact arc extinguishing system, wherein the contact arc extinguishing system is installed in the base, the contact arc extinguishing system comprises a plurality of moving contact units which are separately arranged by interpoles at intervals and correspond to each pole and static contacts of which the number corresponds to the number of the moving contacts; each moving contact unit comprises a contact support; guide parts are arranged in pairs corresponding to each pole on the base, each pair of guide parts can form a cavity with the base, each contact support is rotatably arranged in each cavity, rotating clearances can be formed between each contact support and each guide part as well as each contact support and the base at which each cavity locates, and an accommodation cavity is arranged in each rotating clearance. According to the invention, the accommodation cavities are arranged in the rotating clearances and metal particles can be gradually gathered in the accommodation cavities with the rotation of the contact supports, the relative rotation of the contact supports and the cavities can not be impacted because the metal particles cannot exist among the relative rotating surfaces of the contact supports and the side walls and the bottom sides of the cavities for a long time, thereby ensuring the performances of the electric switch device.

Description

technical field [0001] The invention relates to an electric switch device, which belongs to the field of low-voltage electrical appliances. Background technique [0002] Existing electrical switchgear, see figure 1 , figure 2 , including a base 1 and a contact arc extinguishing system 2, the contact arc extinguishing system 2 is installed in the base 1, the contact arc extinguishing system includes several moving contacts corresponding to each pole separated by an inter-pole interval 11 The head unit 21 and the static contacts 22 corresponding to the number of the moving contact unit 21; the moving contact unit 21 includes a contact bracket 211, and the contact bracket 211 is cylindrical; the base 1 corresponds to each pole in pairs Guide pieces 12 are provided, and a cavity 121 is formed between each pair of guide pieces 12 , and the contact bracket 211 is rotatably placed in the cavity 121 . [0003] In the electrical switchgear with the above structure, the cavity for...

AI Technical Summary

Problems solved by technology

[0004] In actual use, the moving contact and the static contact will often connect and break the current. During this process, an arc will be generated, and the arc will burn the metal bodies such as the moving and static contacts and the arc extinguishing grid, making the moving and static contacts Static contacts and arc extinguishing grids release metal particles, and these metal particles will roll freely in the contact chamber 6 after cooling, and smaller metal particles may enter the cavity 121 and be stuck into the contact bracket 211 and the cavity 121 Between the arc surfaces of the contact bracket 211 and the cavity 121, the frictional resistance increases, and the surface of the contact bracket 211 and the cavity 121 is damaged, which in turn causes the closing and opening speed of the electric switching device to gradually slow down, and finally Affect the electrical performance of electrical switching devices

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