Research on piezoelectric

 pump—lagging of valve

Zhang Jianhui  Wang Dakang

(Beijing University of Technology)

Wang Shouyin

(Changchun Institute of Optics,Fine Mechanics and Physics, Chinese Academy of Sciences)

Qnuki Akyoshi

(Yamagata University, Japan)

Abstract: The piezoelectric pump with valve regarding the phenomenon of abrupt output-decreasing with frequency-increasing (ODFI) is analyzed and researched. The research finds that it is wrong that the increase of the frequency results in the decrease of the amplitude of piezo vibrator is the leading cause for the phenomena of abrupt output-decreasing with frequency-increasing (ODFI). And the experiment has testified that the existing theory is incorrect. The model of lagging of valve that can be used to explained the cause for the phenomena of abrupt output-decreasing with frequency increasing is forward. with frequency increasing is forward. Meanwhile it mentions a new method to observe and develops new observation device used to observe the phenomena of ODFI. It introduces the quantized valve--lagging coefficient, which can be used to evaluate and review the valve, and makes it as the goal function of optimal design of valve.

Key words: Pump  Piezoelectric pump  Valve  Lagging of valve  Optimal design

CLC No: TH32

Received 20020328, received in revised form 20020606