Mechanical Behavior and Failure Analysis of Diaphragm in Diaphragm Compressor for Hydrogen Refueling Station

Abstract

AbstractDiaphragm compressor is widely used to pressurize hydrogen and is one of the key equipment in hydrogen refueling station. And the Diaphragm is one of the wearing parts of diaphragm compressor. The failure of the diaphragm makes the maintenance cost of diaphragm compressor high. Because of the large deflection of the diaphragm in the diaphragm compressor, its mechanical behavior has strong nonlinear characteristics, especially after considering the constraints on the diaphragm by the cavity of the cylinder head, it is difficult to accurately calculate with the analytical method. Therefore, considering the constraint condition of the cylinder, the finite element model of the diaphragm working in the diaphragm compressor is established. By the calculations of the diaphragm deformation and stress, the fractures of the hydrogen side of the diaphragm in the fault cases are analyzed. The results of static structure analysis and dynamic analysis are compared with diaphragm fault cases respectively, which shows the necessity of dynamic analysis in the failure analysis of diaphragm. Besides, the mechanical behavior of the diaphragm’s deformation indicates that the inertial effect of the diaphragm and collision between the diaphragm and the cavity cannot be ignored.