Runner profile value curve design method and axial-flow type check valve

Abstract

The invention discloses a runner profile value curve design method and an axial-flow type check valve. The runner profile value curve design method comprises the following steps that a curve of an inner cavity of a valve body and a profile value curve of the surface of a valve clack are calculated through an equal-strength line source and a linear uniform flow method, and after the curve of the surface of the valve clack is calculated, a profile value curve of a flow guide cover is calculated; the profile curve values, the curve slopes and the curve curvatures at the transition positions of the flow guide cover and the valve clack are the same; and the valve body, the valve clack and the flow guide cover are calculated and designed by utilizing the profile curves. The design method provided by the invention has the following beneficial effects that the axial-flow type check valve is designed and manufactured by adopting the method, the flow resistance coefficient of the axial-flow type check valve can be reduced, the pressure difference can be reduced, the flow coefficient can be improved, the flow capacity can be improved, and boundary layering can be prevented.

Description

technical field [0001] The invention relates to the field of valves, in particular to a method for designing flow path type curves and an axial flow check valve. Background technique [0002] Since the advent of the axial flow check valve, due to its small flow resistance coefficient and low water hammer pressure, it has been widely used in oil and gas long-distance pipeline systems, compressors and large pumps in large ethylene plants and other harsh working conditions. in the piping system. With the development of petroleum and chemical industry, the working conditions of the pipeline system are becoming more and more complex, and the working parameters are getting higher and higher, which also puts forward higher requirements for the performance of the check valve. Although the structural design of the currently used axial flow check valve refers to some experimental data, there is no complete theoretical analysis method to guide the structural design. When the fluid pas...

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Problems solved by technology

Although the structural design of the currently used axial flow check valve refers to some experimental data, there is no complete theoretical analysis method to guide the structural design. When the fluid passes through the axial flow check valve, on the one hand, the pressure loss is too large. , which reduces the circulation and transportation capacity of the pipeline and increases the energy loss of machinery and equipment; on the other hand, it produces obvious mechanical vibration and noise, which easily causes valve leakage or even structural damage, which seriously affects the use of axial flow check valves. safety and reliability

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