Dynamic modeling and analysis of compressor reed valve based on movement characteristics

Abstract

In order to reveal the failure process and its influencing factors of the reed-type valve motion in reciprocating compressor, the dynamic performance of the reed valve is studied in this paper. On the basis of the analysis of actual movement characteristics of the reed valve, the motion process of the valve reed is described as the composition of before bending segment and after bending segment. A mathematical model is presented to predict the dynamic performance of the reed valve. The relationship between the effective length, elastic force and mass of the valve reed with the change of displacement is taken into account in the new model. The influence of viscous effect arising from the oil between the reed and valve seat on the dynamic behavior of a reed valve is also considered in the new model. The fourth order Runge-Kutta method is used to solve the new model in MATLAB environment. In order to verify the validity of the model, the experimental system for measuring the displacement of discharge valve is established. The predicted results of the new model and one-degree-of-freedom model are compared with the experimental results. Analytical results have shown that the new model gave better results with smaller error band, root mean square error and scatter band than one-degree-of-freedom model. Thus the model proposed in this paper proves to be more accurate and effective in describing the valve dynamics. And then the influence of valve lift, reed stiffness, valve orifice diameter and compressor speed on the valve dynamics are analyzed. This research can provide a reference for the optimization and reliability design of the reed-type valve.