粘滞作用下压缩机舌簧阀建模与运动过程

为进一步分析压缩机舌簧阀运动失效机理，揭示油膜黏滞力对舌簧阀运动过程的影响，建立黏滞作用下排气阀运动的单自由度系统模型.该模型综合考虑了阀片工作过程中与限位器发生贴绕的运动特点，以及黏滞力对阀片运动的影响.采用四阶龙格库塔法编制程序，在MATLAB环境下进行数值求解, 并通过排气阀位移测量实验进行验证.结果表明, 考虑黏滞作用的运动模型计算结果中有71.9 %的数据点落在10 %误差带内.与不考虑黏滞作用的单质点模型相比，该模型可更加准确地描述排气阀的动态特性. 最后，利用新模型分析了运动黏度和阀片刚度对舌簧排气阀开启时间和关闭过程的影响.该研究可为舌簧阀的可靠性设计及耐久性研究提供参考.
In order to further analyze the failure mechanism of the reed-type valve in a compressor and reveal the influence of viscous effect arising from the oil between the valve and its seat on the movement process of reed valve, the single-degree of the freedom system model of discharge reed valve motion under viscous action was established. The motion characteristic of the valve reed bending with limiter during the working process and effect of viscous force on valve movement were taken into account in the model. The fourth-order Runge-Kutta method was used to program the numerical solution in the MATLAB environment. The displacement measurement experiment of the discharge reed valve was used to verify and test. Results show that 71.9 % data points in the calculated results of the proposed model fall within 10 % error bands. It is concluded that the proposed model can describe the dynamic characteristics of the reed valve more accurately compared with the model without viscous effect. Finally, the influences of kinematical viscosity and stiffness on the valve opening delay and closing process were analyzed with the proposed model. This research can provide a reference for the optimization and reliability design of the reedtype valve.