Dynamic Analysis of the Discharge Valve of the Rotary Compressor

Discharge valve is very critical component in rotary compressor, and it is a reed valve which consists of valve seat, valve slice and retainer. The motion characteristics of valve slice greatly influence the flowing loss and life of valve. The paper presents a mathematical model to simulate thermodynamic process and motion of the valve simultaneously. Based on the thin-plate theory, the finite element model of the valve slice is built up, and the isoparametric element of eight nodes is adopted which has good adaptability to shape of the valve slice. The valve seat and retainer are taken as stationary boundary conditions. The gas flow through the suction and discharge ports, and the thermodynamics of real refrigerant have been taken into consideration. The Runge-Kutta method and the Newmark method have been taken to solve the equations. In this paper, the influence of the discharge valve with same valve slice and different retainer on the compressor’s efficiency and reed valve’s dynamic stress has been analyzed. The analysis results matches with the experimental results. The proper retainer can be designed to optimize the efficiency and reliability of the valve.