压电泵设计中阀的匹配方法

Study on the Performance Optimization of Check Valve in Piezoelectric Pump

为了在振子能力一定的情况下提高压电泵的效率及输出性能,提出了一种非对称刚度进出口阀的优化方法。使用FLUNT软件对阀开启高度对流速场的作用进行了仿真,并对压电泵吸、排过程的不对称现象进行了讨论。结合单向阀的受力及位移分析,得出了进出口阀位移及回复时间的相对关系,进一步得到了回复时间与泄漏量的关系。引入了泄漏比系数讨论吸排过程泄露的不对称性对压电泵效率及性能的影响规律,提出了采用不同刚度进出口阀的优化方法,从理论上得出了出口阀刚度大于入口阀刚度的最优匹配形式。实验结果表明,在出口阀刚度大于入口阀刚度的条件下,以直径27mm压电振子驱动的单腔泵,在峰峰值为600V的方波激励下可达到635ml/min的输出流量,是以往相同刚度阀优化结果的1.6倍,证明了该方法的有效性。

Provided a method to increase the efficiency and the output of the piezoelectric pump,which used the different stiffness on inlet valve and outlet valve.The effect of valve displacement to the velocity field was simulated by the FLUNT.Asymmetries of suction and discharge process in piezoelectric pump, the force and displacement of the check valve,the relevance between displacement and time on the movement of inlet and outlet valve,and the relevance between time of movement and the leakage,were discussed.The was defined as proportionality factor of leakage,and it was used to discuss the way leakage asymmetry work on the efficiency and performance in the process of suction and discharge of piezoelectric pump.Provide a new method which used different stiffness on inlet and outlet valve.The verification experiment was design for the results of theory analysis.The flow rate of piezoelectric pump achieved 635 ml/min,when the diameter of viberator was 27mm,the thickness of inlet valve was 0.1mm and outlet one was 0.15mm,the driving voltage was 600V(peak to peak)square wave.The result shows that,it′s flow rate was 1.6times as the old one,which was on the condition of the stiffness of outlet valve bagger than inlet one.