谐振型大流量阀式压电气泵的设计与实验

Design and Experiment of a Resonant Large-Flow Valve-Type Piezoelectric Air Pump

摘要:

针对阀式压电气泵工作频率低、流量小的问题，设计了一款由压电振子直驱的谐振型气泵。首先设计了压电谐振气泵的构型，并对其结构进行仿真分析，得到结构参数对气泵输出特性的影响。初步制作了压电谐振气泵的样机，并搭建实验测试装置，研究不同结构参数下压电振子的振动特性，以及气泵流量、压力的变化规律。 基于仿真与实验的结果，确定了四臂阀片与压电振子谐振频率的匹配关系，当阀片的基频与振子一阶谐振频率接近且略高 225 Hz 时，两者的匹配性最好。优化后，当驱动电压峰峰值为 120 V、驱动频率为 1 600 Hz 时，所研制谐振型阀式压电气泵的输出流量为 1 241. 28 mL/min，输出压力为 7. 56 kPa。

Abstract:

To solve the problems of low operating frequency and small flow rate of valve-type piezoelectric pump， a resonant air pump directly driven by piezoelectric oscillator was designed. First， the configuration of the piezoelectric resonant air pump was designed， and its structure was simulated and analyzed， and the influence of structural parameters on the output characteristics of the air pump was obtained. The prototype of the piezoelectric resonant air pump was preliminarily made， and an experimental test device was set up to examine the vibration characteristics of the piezoelectric oscillator under different structural parameters， as well as the change law of the flow rate and pressure of the air pump. Based on the simulation and experimental results， the matching relationship between the resonant frequency of the four-arm valve and piezoelectric oscillator is determined， and when the fundamental frequency of the valve is close to the first-order resonant frequency of the oscillator and slightly higher by 225 Hz， the matching between the two is the best. After optimization， when the driving voltage is 120 V_pp and driving frequency is 1 600 Hz， the output flow rate of the resonant valve-type piezoelectric pump is 1 241. 28 mL/min and output pressure is 7. 56 kPa.