A Study Of The Characteristics Of Disc Fluid Check Valve

The MPCL system has been widely used in space vehicles.As a key part of the control of fluid into and out of the pump chamber,the performance of the passive check valve has special significance to the whole fluid loop system.At present,research on valve is divided into two kinds of cantilever beam and plate.In some high demand applications,disc valve is the main choice for researchers.In this paper,the design theory,the structure analysis and the fluid performance simulation and experiment of disc valve are studied,and specific can be divided into the following areas:Firstly,the working principle of the magnetic fluid pump is described,the working conditions of globe valve are discussed,and designed the different structure of the passive check valve,theoretical analysis is carried out on the cantilever beam and disc valve.Combined with the working conditions of the valve,the advantages and disadvantages of the two kinds of valve are analyzed.At room temperature,cantilever valve has simple process and fast response,flow loss and leakage rate are at acceptable range,it's better than disc valve.At low temperature,disc valve is under uniform stress and has high reliability,besides it's not easy to damage,so it's better than cantilever beam valve.The disc valve provides better performance in the operating temperature of the MPCL system.Secondly,starting from three different linear equations of circular involute,Fermat curve and Archimedes curve,designed disc valve with different structure.The performance of different valve was compared by ANSYS static structure analysis and modal analysis.It is found that the linear energy of circular involute is optimal.Based on geometric parameters of circular involute,the effects of the thickness of the valve,the eccentricity,the offset angle and the radius of the base circle on the performance of the valve were studied.With the increase of the thickness of the valve plate,the offset angle and the radius of the base circle,the first order vibration frequency of the valve plate increases,and the maximum stress and the maximum displacement of the valve plate are reduced.With the increase of the eccentric distance,the first order vibration frequency of the valve plate increases first and then decreases,and the maximum stress and the maximum displacement of the valve plate are reduced first and then increased.Then the stress concentration problem of the valve is optimized.Thirdly,the performance testing device of the valve is designed based on the experimental principle.It also gives the three-dimensional structure and the selection of processing and materials.Then the experimental platform is built to test the fluid properties.Experimental results show that the forward flow characteristic of valve is directly proportional to pressure.With the increase of pressure,the characteristic of the reverse flow closure and the leakage rate increase first and then decrease.The slope of the characteristic curve of alcohol is greater than that of water.Then,the influence of the thickness of the valve,the eccentricity distance,the offset angle and the radius of the base circle on the flow characteristic curve is compared.Then the valve is simplified and simulated by Fluent.The experimental results are similar to the simulation results.Finally,there is a summary and outlook of the full text.In the future,we could continue to conduct in-depth research on three aspects of the visualization of the valve performance testing device,the quantitative analysis of the influence of the geometric parameters of the valve plate on the performance and the performance test of the valve plate at low temperature.