A moving contact unit and a three-position switch using the moving contact unit

Abstract

The invention relates to a moving contact unit and a three-position switch with the moving contact unit. The moving contact unit comprises contact fingers arranged pairwise, the two revolution radial ends of the two contact fingers in one pair are provided with an isolated grounding clamp port and a static contact clamp port respectively, the isolated grounding clamp port is electrically connected with a corresponding functional contact, the static contact clamp port is electrically connected with a static contact, a suspended support piece is arranged between the isolated grounding clamp port and the static contact clamp port, the two contact fingers in the same pair swing along the width direction of the isolated grounding clamp port and the static contact clamp port relative to the suspended support piece by taking the suspended support piece as the fulcrum, the two revolution radial ends of the two contact fingers in the same pair are also provided with elastic contraction device for contracting the isolated grounding clamp port and the static contact clamp port, the moving contact unit further comprises a contact finger support through which the suspended support piece is fixedly mounted, and the contact fingers are erected on the contact finger support via the suspended support piece. The contact fingers in the contact unit can swing for a certain degree according to the centering requirement, convenience is provided for assembling and debugging, and use is convenient.

Description

technical field [0001] The invention relates to a moving contact unit and a three-position switch using the moving contact unit. Background technique [0002] Three-position switches are usually used in combined electrical appliances, which can realize three functions of closing, opening and grounding. For example, the three-position switches of conventional 35kV closed combined electrical appliances at home and abroad are all direct-acting structures. Spring contacts are provided on the isolation contacts or grounding contacts. The head moves in a straight line to realize the conduction or disconnection with the isolation contact or the ground contact, and the overall size is large. However, limited by the structure of closed combined electrical products, some products need to adopt a rotary structure to realize the opening and closing operation. [0003] A three-position switch with a rotating structure, such as a three-position isolating switch disclosed in a Chinese pa...

AI Technical Summary

Problems solved by technology

However, in order to ensure that the movable contact can accurately cooperate with the corresponding static contact when it rotates, the isolation contact and the grounding contact need to be precisely on the swing path of the movable contact, so the above-mentioned rotary structure is very important for the three-position switch. Manufacturing precision and assembly precision are very high, manufacturing cost is high, assembly is difficult, centering adjustment requires a lot of manpower and time, debugging efficiency is low, and repair and maintenance are inconvenient

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