Optimal Design Of 70MPa Diaphragm Compressor

The diaphragm compressors rely on hydraulic oil to drive the diaphragm in the membrane cavity to undergo reciprocating deflection and deformation to change the volume of the membrane cavity to achieve gas compression.Because of its special structural characteristics,it can ensure that the purity of the gas is not polluted,and can achieve high-pressure working conditions,so it is extremely widely used in existing hydrogen refueling stations.Based on the working principle of the diaphragm compressor,this paper adopts the research method combining basic theory,numerical analysis and experimental verification to design and develop a 70 MPa high-pressure hydrogen compressor.The main work is as follows:1.According to the existing model series,calculated the required cylinder size and required power.Under high pressure and high temperature hydrogen conditions,the finite element method is used to analyze the temperature field,deformation and stress of the components of high pressure diaphragm compressor.According to the problems found in the analysis results,an improvement plan was proposed,and the rationality of the improvement plan was further analyzed and verified,and a reasonable cylinder structure was obtained.2.Analyzed the force of the diaphragm of the diaphragm compressor,obtained its mechanical model,and proposed a variety of linear fitting methods to solve the transition point problem based on its shortcomings.and used elastic mechanics to establish the surrounding solid The large deflection deformation theory of the branched circular plate conducts mechanical analysis on several fitting curves,and the new cavity curve can greatly improve the fatigue life of the diaphragm.Based on elastic mechanics,the theory of large deflection deformation of the peripheral fixed-supported circular thin plate is established,and several fitting curves are mechanically analyzed.The results show that the new cavity curve can greatly increase the fatigue life of the diaphragm.3.Analyzed the influence of flow of hydraulic oil in a complex space on the flow rate of hydraulic oil,and found that the structure of oil passage has an important influence on the flow of hydraulic oil.This paper analyzes flow field distribution of hydraulic oil in the flow channel under the conditions of different multi-air ratio and different oil channel distribution,and obtains a more reasonable flow channel structure.4.Designed a high-pressure experimental platform based on the existing platform,and designed the compressor experimental process according to the hydrogen refueling process on site at the hydrogen refueling station.The security and reliability of platform were optimized.The high-pressure hydrogen compressor was tested according to actual operating conditions.