Butterfly valve, valve plate of butterfly valve and connecting structure of valve plate of butterfly valve and rotating shaft

Abstract

The invention discloses a butterfly valve. The butterfly valve adopts a brand-new design structure, so that the problems of high cost and poor reliability of the design of ensuring correct closing ofa valve plate through a positioning pin in the prior art are solved, and the problem of low strength caused by punching of a through hole in a rotating shaft is solved. Meanwhile, the invention correspondingly provides a valve plate of the butterfly valve and a connecting structure of the valve plate of the butterfly valve and the rotating shaft. The butterfly valve comprises a valve body, the valve plate and the rotating shaft; the valve plate is connected with the rotating shaft and can rotate along with the rotating shaft; a step is arranged on the drift diameter of the valve body; a limiting boss A with the outer side flush with the edge of the front plate surface is arranged on the front plate surface of the valve plate, so that when the valve plate rotates in the opening direction, the limiting boss A abuts against the drift diameter of the valve body, and the valve plate cannot rotate by more than 180 degrees; a limiting boss B of which the outer side is hung out of the edge ofthe back plate surface is arranged on the back plate surface of the valve plate, so that when the valve plate reaches a closed state, the limiting boss B is matched with the step to form limiting to prevent the valve plate from continuously rotating in the closing direction.

Description

technical field [0001] The invention relates to a regulating valve, in particular to a vacuum butterfly valve which can be used in large and medium-sized transformers, rectifying transformers, reactors, and pipelines of power transformer oil circulation cooling systems. Background technique [0002] As a part of the pipeline, the butterfly valve is opened or closed by rotating the valve plate during use, so as to control the fluid flow in the pipeline. [0003] The butterfly valve in the prior art mainly includes a valve body, a valve plate, a rotating shaft, a shaft head cover, a positioning pin and a sealing device. There is a rubber part on the valve plate, which forms a tight fit with the bore of the valve body in the closed state to achieve sealing. When closing the butterfly valve, in order to make the valve plate seal in the correct position, positioning pins are usually set on the bore of the valve body to ensure that the valve plate will not be closed and misplaced...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the above-mentioned defects existing in the prior art, the present invention provides a butterfly valve. The butterfly valve adopts a newly designed structure to overcome the high cost and disadvantages of the prior art in which positioning pins are used to ensure the correct closing of the valve plate. The problem of poor reliability, and the problem of low strength caused by punching holes in the shaft

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