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Zhang Jianhui
College of Mechanical Engineering &
Applied Electronics Technology,
Beijing University of Technology,
Beijing 100022, China
Xia Qixiao
College of Mechanical &
Electronic Engineering,
Beijing Union University,
Beijing 100020, China
Hong Zhen
Onuki Akiyoshi
Engineering Department,
Yamagata University,
4-3-16 Jonan Yonezawa,
992-8510, Japan |
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FLOW DIRECTION OF PIEZOELEC-
TRIC PUMP WITH NOZZLE/DIFFUSER-
ELEMENTS*
Abstract:
The piezoelectric pump with nozzle/diffuser-elements, which oscillating form differing from regular volumetric reciprocating or rotating pumps because there are nozzle/diffuser-elements substituted for regular valves, is a new type pump whose actuator is a piezoelectric ceramal
part with verse piezoelectric effect. In recent year,
piezoelectric pump is paid increasing attention to because it is
an ideal candidate in application in such area as medical
health, mechanical tools and micro-mechanism. The fundamental research on it, however, is still not made through. Focuses on the phenomenon of different directions of flow among Germany pump, Chinese pump and Swiss pump, which are all fitted with nozzle/diffuser-elements, and analyzes the cone angle of nozzle/diffuser-elements based on the flow equation of valve-less piezoelectric pump with nozzle/diffuser-elements. As a result, the concepts of diffuser loss coefficient and loss coefficient are introduced to explain these phenomena, from which a discussion is given on the optimization of the cone angle of nozzle/diffuser-element aiming at the maximum of pump flow.
Key words: Piezoelectric pump Flow direction Valve-less |