Analysis And Optimization Design Of Diaphragm Pack Of Diaphragm Compressor In Hydrogen Refueling Station

The rapid development of hydrogen energy fuel cell vehicles has expanded the demand for hydrogen refueling stations,and higher requirements have been put forward for the performance of diaphragm compressors,an important equipment for hydrogen refueling stations.Diaphragm compressors compress and transfer gases by mechanically or hydraulically actuating diaphragms to elastically deform them.Therefore,the life and reliability of the diaphragm play a vital role in the influence of the diaphragm compressor,the diaphragm is subjected to millions of times of stress per minute during work,according to statistics,most of the fault types of diaphragm compressor diaphragm are caused by fatigue damage of the diaphragm during the working process,mainly manifested as severe warpage deformation,perforation and cracks.Therefore,it is of great significance to explore the structure of monolayer diaphragm and diaphragm group and optimize the diaphragm.The main research contents of this paper are:(1)Firstly,according to the stress of the diaphragm and the hydraulic cylinder in a suction and exhaust cycle,the stress of the diaphragm is analyzed,and on this basis,according to the stress-strain situation of the monolayer diaphragm at different positions in a compression process,the stress-strain law of the diaphragm in the process of deformation is obtained;Then,the stress-strain situation of the three-layer diaphragm group under different deflections was analyzed,and the vulnerable area of the diaphragm was located.(2)The finite element method was used to analyze the diaphragm group of the diaphragm compressor,and the equivalent force strain of the three-layer diaphragm was simulated according to the main parameters and working conditions and force of the MD2.5 compressor diaphragm,and the analysis results were compared with the theoretical calculation.(3)The thickness of the diaphragm group,the material and the transition fillet of the oil cavity and the diaphragm bonding surface were optimized,the working life of the diaphragm group was extended,the stress concentration of the diaphragm from the lamination angle of the membrane cavity was alleviated,and the structure of the diaphragm group was optimized.The analysis and optimization results show that the mechanical and finite element analysis of the diaphragm is carried out,the deformation curve of the diaphragm under force is obtained,and the sliding zone and adhesion zone are analyzed.By optimizing the diaphragm pack,the service life of the diaphragm pack can be improved,which can effectively improve the working efficiency of the diaphragm compressor.