并联压电泵腔体初始容积设计

为探究腔体初始容积对压电泵性能的影响,设计了双腔体并联压电泵.通过理论分析,确定了双腔并联压电泵能够工作时泵腔初始容积的取值范围,根据理论公式设计制作了6种不同腔体初始容积的双腔并联有阀压电泵样机,对泵腔初始容积的变化与泵工作性能关系进行研究.在110 V工作电压下,工作频率小于400 Hz范围内,用压电双晶片进行驱动,分别以液体水和空气为介质,对不同压缩比（压电振子振动产生的泵腔容积变化量与泵腔初始容积的比值）下的并联泵进行了试验测试.结果表明,当泵送液体水时,压缩比为1/18时泵的整体输出流量最好,最大输出流量可达1 330 mL/min,压缩比越大,泵的输出压力和自吸能力越好,最大输出压力和自吸高度分别为58.5 kPa和69 cm;当泵送气体空气时,压缩比越大,泵的输出能力越好,最大输出流量和压力分别为850 mL/min和6.5 kPa,当压缩比小于1/32时,泵已经失去了输出气体能力.

Design of initial volume of parallel double-chamber of piezoelectric pump

In order to explore influence of initial volume of the pumping chamber on performance of a piezoelectric pump,several piezoelectric pumps with parallel double-chamber and a check-valve were manufactured,in which six different initial volumes were designed.The performance of those pumps was measured under different compression ratios（the ratio of stroke volume over the initial volume） when they were driven by a bimorph actuator at the 110 V driving voltage and frequency of less than 400 Hz,in the cases that water and air were handled,respectively.The results showed that a pump has the best output flow rate when its compression ratio was 1/18 for water,and the highest flow rate as high as 1 330 mL/min.A larger compression ratio could result into a higher output pressure and a better self-priming capability.The maximum output pressure and the highest self-priming water column height were 58.5 kPa and 69 cm,respectively.For air,however,the larger the compression ratio,the better the pump output performance.The maximum output flow rate and the highest output pressure were 850 mL/min and 6.5 kPa,respectively.When the compression ratio was less than 1/32,the pump performance would be breakdown.