压电泵增频流量骤减现象的解释  

Interpretation to Pump′s Flow Rate Decrease when Working Frequency Add

作　　者：吴博达[1] 林敬国[1] 曾平[1] 刘国君[1] 杨志刚[1] 程光明[1] 

机构地区：[1]吉林大学机械科学与工程学院,吉林长春130025

出　　处：《压电与声光》2006年第5期588-590,共3页Piezoelectrics & Acoustooptics

基　　金：国家高技术研究发展计划("八六三"计划)基金资助项目(2001AA404250)

摘　　要：压电泵属于容积的泵,理论上可通过提高工作频率增加泵单位时间出流量;而实际上随着频率增加,被动阀压电泵的流量有一个峰值,然后骤然下降,该现象的存在制约着压电泵的推广应用,有必要给出合理的解释。通过理论分析和实验测试得出:激励频率增加,压电振子振幅减小,只是导致该现象诱因,其根本原因是振子变形量减小,引起泵腔内外压力差降低,从而使阀片开度变小甚至不能开启。与此同时,频率提高,被动阀片振动的滞后性使得阀片截止性处于失效或半失效状态,泵的一个工作周期内泄漏量增加。设计了阀振动滞后性测试装置,以整体开启阀压电泵为模型作了测试。Piezo-pump belongs to cubage pump. On theory, the higher the working frequency is, the bigger the flow rate is. But in fact when frequency increases, the flow rate of pump with checked valves has a peak value, and then decreases, which limits pump＇s application. So the interpretation is necessary. Both theoretic analyses and experiments show that the decrease of bimorph＇s deformation is just a inducement. Its real reason is that when deformation decreases, the pressure＇s difference between pump＇s inside and outside becomes low, so the checked valve vibrates small, or even with no vibration. At the same time the valve＇s lagging vibration made its capability available or partially available, then pump＇s leaking adds. The equipment used to test valve＇s lagging is designed, and piezopump with integral valves as sample is tested.

关 键 词：泵 压电泵 临界开启压力 阀滞后性 倒吸 

分 类 号：TH137.3[机械工程—机械制造及自动化]