"Y"形流管无阀压电泵振动分析及泵流量计算

为了解决医疗、卫生、保健领域进行细胞或高分子等输送工作的需要,研制了一种新型的压电泵——"Y"形流管无阀压电泵,并对其压电振子振动特性及泵流量计算进行了研究。介绍了"Y"形流管无阀压电泵及其流管的结构和特点;基于圆形薄板弯曲振动理论对压电振子振动进行了理论分析;然后讨论了泵及其流管内流体的流动特性,建立了泵流量方程。最后,基于有限元法对流管内流体流动状态进行了模拟,得到了正反流压强变化规律及正反流流阻。实验结果表明:理论泵流量与实验泵流量变化趋势一致,且两者最小相对误差为12%,证明了理论分析与数值模拟的有效性和正确性。

Research on vibration and pump flow rate of valveless piezoelectric pump with Y-shape tubes

In order to meet the needs of transporting cells and macromolecules in such areas as medical mechanism,sanitation and health care,a new type of piezoelectric pump,the Valveless Piezoelectric Pump with Y-shape Tubes(VPPYT),is presented and its vibration and pump flow rate are analyzed.The structures and characteristics of VPPYT and its tubes are introduced firstly.Then,based on the bending vibration theory of thin circular board,the vibration of the piezoelectric actuator is analyzed theoretically.After that,through analyzing the fluid state in VPPYT and its tubes,the equation for the calculation the pump flow rate is established.Finally,Finite Element Method(FEM) is employed to simulate the flow state in the Y-shape tubes to obtain the flow resistances and pressure variation rules along the positive and negative directions,respectively.The experimental results show that the theoretical and experimental pump flow rates follow the same variation trend,and the minimum relative error between the two results is 12%.Thus the validity and correctness of the theoretical analysis and the numerical simulation are proved.