Numerical simulation and experimental study on plate valve transient motion and fatigue fracture principles

摘要

Valve is the most frequently damaged component of reciprocating compressor which is widely applied in refining, pipeline and metallurgical enterprises. Recently, the researches on fault diagnosis of reciprocating compressor mostly focus on faults feature extraction and signal processing methods not the basic mechanisms of faults. In this paper, the modified thermodynamic and dynamic models have been established which have a higher accuracy, and the transient movements of plate valve in different conditions have been simulated. With the simulation results of the impact on valve elements in the opening and closing processes, the finite element analysis of valve plate under impact load has been finished. The experiment results show that the realistic vibrations of different spring stiffness have the same laws with the numerical simulation and analysis results. Reasonable spring stiffness will affect the valve impact vibration and operation life significantly. The research of this paper based on actual demand of fault diagnosis of reciprocating compressor is much significant for optimal design of valve, diagnosing valve faults and reducing costs of inspection and maintenance.