非对称分叉流管无阀压电泵的设计及试验

具有微混合功能的多级Y型流管无阀压电泵存在着输出流量与振子带载能力不平衡的问题。为此，提出了一种非对称分叉流管无阀压电泵。首先，理论分析了该无阀压电泵输出流量与流管流阻间的关系；其次，利用有限元软件数值计算了多级Y型流管的流阻特性；最后，采用光固化快速成型技术加工了样机，并进行了泵特性试验和振子振动测试。试验结果表明：在峰峰值200 V正弦波交流电驱动下，该压电泵的流量、扬程和压电振子的振幅都随驱动频率增加呈现先增大后减小的趋势；当驱动频率为31 Hz时，最大流量为4 g/min；驱动频率为38 Hz时，最大扬程为40.5 mmH2O。在试验施加电压范围内，该泵的输出性能与驱动电压呈正相关性。本研究验证了非对称流道树型无阀压电泵的可行性，为非对称无阀压电泵在微流道滴灌和微混合等领域的应用提供了参考。

Design and Experimental Study of Valveless Piezoelectric Pump with Asymmetrical Bifurcated Channels

Valveless piezoelectric pump with multistage Y-shape tubes has the function of micro-mixing, but it exists the problem of unbalance between the output flow and the output capacity of the piezoelectric vibrator. So, a valveless piezoelectric pump with asymmetrical bifurcated channels is proposed in this paper. First, the relationship between flow resistance and output flow of the valveless piezoelectric pump is obtained through theoretical analysis. Then, the flow resistance of the multistage Y-shape tube is numerically calculated by using finite element software. Finally, the prototype is fabricated by stereolithography technology, and performance experiments of the piezoelectric pump and vibration of the piezoelectric vibrator are performed. Experimental results show that the flow rate, head and amplitude of piezoelectric vibrator increase first and then decrease with the increase of driving frequency when the piezoelectric pump is driven with a sinusoidal voltage of 200Vpp. The maximum flow rate of 4g/min is obtained at 31Hz and the pump head can reach a maximum of 40.5mmH2O at 38Hz. The output performance of the pump is positively correlated with the driving voltage of the piezoelectric vibrator. The proposed valveless piezoelectric pump has a bifurcated channel and thus suitable for microfluidic drip irrigation and mixing applications. The study validates the feasibility of the valveless piezoelectric pump with asymmetrical bifurcated channels and provides a reference for the application in micro-channel drip irrigation and micro-mixing fields.