轴向出流的单腔压电泵结构设计与性能研究

Structure Design and Performance Research of Single-chamber Piezoelectric Pump with Axial Flow

为提高压电泵的输出性能,设计了一种新型轴向出流的单腔有阀压电泵。泵体结构主要由3部分构成,即固定压电振子的上盖、带有腔体结构和被动截止阀的中间体及起压紧和密封作用的下盖。轴向出流的单腔压电泵的结构是将进口阀安装在圆柱形腔体的中心位置,保证进口管的轴线与压电振子垂直,出口阀安装在泵腔外,通过导流槽与泵腔连接,形成轴向进出流方式。将轴向出流的单腔压电泵和早期设计的侧向出流压电泵进行输出性能测试,试验发现,在低频工作阶段,侧向出流的单腔压电泵输出效果要略高于轴向出流,在高频工作阶段,后者要高于前者,而在整个40~400 Hz测试范围内,后者输出的液体压力都要高于前者。

In order to improve the output performance of piezoelectric pump,a novel single-chamber axial flow pump with valves is designed.The pump structure consists of three parts:the upper cover of the fixed piezoelectric vibrator,the intermediate of the chamber structure and the passive check-valve,and the lower cover with the action of pressure tightening and sealing.The structure of the axial flow piezoelectric pump is to install the inlet valve in the center of the cylindrical chamber to ensure the axis of the inlet tube is perpendicular,and the outlet valve is installed outside the pump chamber through the groove connected with it to form the axial flow in and out mode.The output performance of the single-chamber piezoelectric pump with axial flow and the early designed lateral flow piezoelectric pump are tested.The results show that the output effect of the single-chamber piezoelectric pump with lateral discharge is slightly better than that of axial discharge in the low-frequency working stage.However,in the high-frequency operation,the latter is better than the former,and in the whole range of 40~400 Hz,the latter is better than the former in output pressure.