线性压缩机排气阀片动态特性研究及优化分析

Study and optimization on dynamic characteristics of linear compressor’s discharge valve

为研究圆盘阀的运动规律及排气腔内流场的动态特性,基于ANSYS平台建立线性压缩机排气阀片双向流固耦合模型。对线性压缩机在不同压力比、频率、弹簧刚度和阀片间隙下的阀片运动规律和流场动态特性进行仿真模拟,得到排气阀片的位移曲线、排气腔内制冷剂流速和质量流量曲线、排气腔内制冷剂流动的速度矢量图。由仿真结果分析可知:当压力比增大和频率升高时,排气腔内质量流量增大,并出现制冷剂回流现象;通过增大弹簧刚度及减小阀片间隙,可以保证在相同工况下,改善回流现象,提高线性压缩机的工作效率。

In this article,in order to explore the motion of the disc valve and the dynamic characteristics of flow field in the discharge chamber,the bi-directional fluid-solid coupling model of the linear compressor's discharge valve is set up by means of the ANSYS platform.The comparative analysis is conducted on the motion of the valve and the dynamic characteristics of flow field of the linear compressor with different pressure ratios,frequencies,spring stiffness and valve gaps;thus efforts are made to work out the curve of the discharge valve's displacement,the curve of the refrigerant's flow rate and the curve of the mass flow rate in discharge chamber,as well as the velocity vector diagram of refrigerant flow in the discharge chamber.The simulation results show that when the pressure ratio and the frequency increase,the mass flow rate in the discharge chamber increases and the refrigerant will experience backflow.By increasing the spring stiffness and reducing the valve gap,the backflow phenomenon can be improved and the linear compressor will enjoy higher working efficiency under the same working conditions.