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FLOW DIRECTION OF PIEZOELECTRIC PUMP WITH NOZZLE/DIFFUSER-ELEMENTS

Chinese Journal of Mechanical Engineering 2004年第1期17卷 107-109页

作者： ZhangJianhui xiaqixiao HongZhen OnukiAkiyoshi CollegeofMechanicalEngineering＆AppliedElectronicsTechnology BeijingUniversityofTechnologyBeijing100022China CollegeofMechanical＆ElectroricEngineering BeijingUnionUniversityBeijing100020China EngineeringDepartment YamagataUniversity4-3-16JonanYonezawa992-8510Japan

The piezoelectric pump with nozzle/diffuser-elements, which oscillating formdiffering from regular volumetric reciprocating or rotating pumps because there arenozzle/diffuser-elements substituted for regular valves, is a new type pump whose actuator is apiezoelectric ceramal part with verse piezoelectric effect In recent year, piezoelectric pump ispaid increasing attention to because it is an ideal candidate in application in such area as medicalhealth, mechanical tools and micro-mechanism. The fundamental research on it, however, is still notmade through. Focuses on the phenomenon of different directions of flow among Germany pump, Chinesepump and Swiss pump, which are all fitted with nozzle/diffuser-elements, and analyzes the coneangle of nozzle/diffuser-elements based on the flow equation of valve-less piezoelectric pump withnozzle/diffuser-elements. As a result, the concepts of diffuser toss coefficient and losscoefficient are introduced to explain these phenomena, from which a discussion is given on theoptimization of the cone angle of nozzle/diffuser-element aiming at the maximum of pump flow.

关键词： Piezoelectric pump Flow direction Valve-less

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DISCOVERY AND ANALYSIS ON CAVI TATION IN PIEZOELECTRIC PUMPS

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Chinese Journal of Mechanical Engineering 2004年第4期17卷 591-594页

作者： ZhangJianhui xiaqixiao LaiDehua OnukiAkiyoshi HongZhen CollegeofMechanicalEngineeringandAppliedElectronicTechnology BeijingUniversilyofTechnologyBeijing100022China CollegeofElectromechanics BeijingUnionUniversityBeijing100020China CollegeofMechanicalEngineeringandAppliedElectronicTechnology BeijingUniversityofTechnologyBeijing100022China DepartmentofEngineering YamagataUniversityYamagataJapan

The contributing factors for the cavitation in piezoelectric pumps areanalyzed, theoretically, and the device fitting for observing and recording is set up. With it theexperiments are carried out to observe the emergence and the flowing of the cavitations in thepiezoelectric pumps. According to the statistic and the analysis to the data of the experiments, thepeculiar features are discovered. These features are composed of balls-amassing, center-more, andflow-out.

关键词： Pump Piezoelectricity pump Cavitations Observation

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