Valve diaphragm with high fatigue performance

Abstract

The invention discloses a valve diaphragm with high fatigue performance, and belongs to the technical field of regulating valves. The edge of the valve diaphragm is provided with an installation sealing area (1) fixedly connected with the periphery of an upper diaphragm capsule and the periphery of a lower diaphragm capsule, and the center of the valve diaphragm is a reciprocating flexing area (2)capable of moving in a reciprocating mode after being stressed; the thickness of the installation sealing area (1) is larger than that of the reciprocating flexing area (2), and a transition step (3)is formed between the installation sealing area (1) and the reciprocating flexing area (2) of the valve diaphragm; the installation sealing area (1) of the valve diaphragm is fixed to the periphery of the upper diaphragm capsule and the periphery of the lower diaphragm capsule, and the space between the upper diaphragm capsule and the lower diaphragm capsule is sealed; the inner side of the transition step (3) does not make contact with the upper diaphragm capsule and the lower diaphragm capsule when the valve diaphragm is not in the working state; and when the valve diaphragm works, the reciprocating flexing area (2) does reciprocating movement under the action of valve air pressure. The valve diaphragm is provided with the step, so that the fatigue performance of the valve diaphragm canbe remarkably improved.

Description

technical field

[0001] The invention relates to a valve diaphragm with high fatigue performance and belongs to the technical field of regulating valves. Background technique

[0002] For the valve diaphragm structure with reciprocating motion, the existing valve diaphragm often adopts an equal-thickness design to reduce the difficulty of the molding process, or designs a boss at the sealing position of the bellows to improve the local sealing performance. This type of diaphragm is not poor in sealing performance. Good, that is, the fatigue life does not meet the technical index requirements. According to calculations, increasing the valve diaphragm thickness can increase its sealing performance, and reducing the valve diaphragm thickness can increase its fatigue performance, which has caused a design contradiction for the valve diaphragm thickness. In order to solve such contradictions, the present invention designs a A structure with thicker edges and thinner middle enhanc...

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