Check valve special for gas pipeline

Abstract

The invention provides a check valve special for a gas pipeline. A first seal ring plate and a second seal ring plate are fixedly arranged in a pipe body of the gas pipeline and correspond to arcs of the inner wall of the pipe body. The two seal ring plates are arranged in the axial direction of the pipe body in a staggered manner. Besides, the top end of the first seal ring plate exceeds the center axis of the pipe body 1, and the tail end of the second seal ring plate does not reach the center axis of the pipe body. A valve plate is rotationally arranged between the first seal ring plate and the second seal ring plate. The valve plate is connected with a rotating shaft, wherein the rotating shaft is eccentrically arranged in the pipe body. A stop bar limiting the overturning amplitude of the valve plate is further arranged in the pipe body. When a roots blower normally starts, after an rated pressure is obtained, the valve plate of the check valve is normally opened; when the roots blower stops, because of the dead load generated by an eccentric structure and the gas pressure, the valve plate is rapidly closed, and therefore the phenomenon that backflow high-pressure gas caused when the roots blower rotates reversely enters the roots blower, and then the roots blower rotates oppositely and is damaged is avoided; and in this way, the use safety performance is greatly improved.

Description

technical field [0001] The invention relates to the technical field of gas pipeline sealing, in particular to a special check valve for gas pipelines. Background technique [0002] The function of the check valve is to prevent the backflow high-pressure gas caused by the reversal of the fan from entering the fan, causing the fan to reverse, thereby destroying the fan. The traditional check valve is connected in the horizontal pipeline of the fan through the pipe connection flange, and this kind of check valve is feasible in the use of ordinary Roots blower. However, in some special industries, especially in the process of using Roots blower to transport gas, it is necessary to ensure that the gas pipeline system is well sealed and has no leakage. When working, it is easy to be blocked by coal tar mist precipitation, resulting in the failure of the check function, resulting in serious consequences. In order to improve production safety and production efficiency, the check va...

AI Technical Summary

Problems solved by technology

However, in some special industries, especially in the process of using Roots blower to transport gas, it is necessary to ensure that the gas pipeline system is well sealed and has no leakage. When working, it is easy to be blocked by coal tar mist precipitation, resulting in the failure of the check function, resulting in serious consequences. In order to improve production safety and production efficiency, the check valve must be cleaned and maintained regularly, while the traditional check valve must be completely removed from the pipeline system. Disassemble to clean and repair

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