Research on transient motion and fatigue fracture principles of reciprocating compressor valve

摘要

Due to the reciprocating motion effects, reciprocating compressor has many moving and damageable parts in which valve is the most frequently damaged component. At present, the research on fault diagnosis of reciprocating compressor valve mostly focus on the fault feature and signal processing methods not the basic reason of valve faults. In this paper, the theoretical model of cylinder and valve in three-dimension have been built, the cylinder internal flow field and the valve transient movement in different condition have been numerical simulated from which we find the laws of the internal flow field of the cylinder and the valve transient motion. We also calculate the impact force of valve sheet, valve seat and the lift limiter guard in the opening and closing process of valve. Further, we establish finite element models of valves for stress analysis under the impact load; then discuss the reason of valve fatigue fracture. The research of this paper based on actual demand of fault diagnosis of reciprocating compressor is much significant for optimize designing of valve, diagnosing valve faults and reducing costs of inspection and maintenance.