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Advances in Valveless piezoelectric pump with Cone-shaped Tubes

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Chinese Journal of Mechanical Engineering 2017年第4期30卷 766-781页

作者： Jian-Hui Zhang Ying Wang Jun Huang College of Mechanical and Electrical Engineering Guangzhou University Guangzhou 510006 China College of Mechanical and Electrical Technology Taizhou Polytechnic College Taizhou 225300 China Research Center of Fluid Machinery Engineering andTechnology Jiangsu University Zhenjiang 212013 China

This paper reviews the development of valve- less piezoelectric pump with cone-shaped tube chrono- logically, which have widely potential application in biomedicine and micro-electro-mechanical systems because of its novel principles and deduces the research direction in the future. Firstly, the history of valveless piezoelectric pumps with cone-shaped tubes is reviewed and these pumps are classified into the following types： single pump with solid structure or plane structure, and combined pump with parallel structure or series structure. Furthermore, the function of each type of cone-shaped tubes and pump structures are analyzed, and new direc- tions of potential expansion of valveless piezoelectric pumps with cone-shaped tubes are summarized and deduced. The historical argument, which is provided by the literatures, that for a valveless piezoelectric pump with cone-shaped tubes, cone angle determines the flow resistance and the flow resistance determines the flow direction. The argument is discussed in the reviewed pumps one by one, and proved to be convincing. Finally, it is deduced that bionics is pivotal in the development of valveless piezoelectric pump with cone-shaped tubes fromthe perspective of evolution of biological structure. This paper summarizes the current valveless piezoelectric pumps with cone-shaped tubes and points out the future development, which may provide guidance for the research of piezoelectric actuators.

关键词： piezoelectric pump Valveless Cone-shapedtube Bionics

Theory and Experimental Verification on Cymbal-shaped Slotted Valve piezoelectric pump

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Chinese Journal of Mechanical Engineering 2018年第1期31卷 212-219页

作者： Jun Huang Yi-Chao Zhu Wei-Dong Shi Jian-Hui Zhang National Research Center of pumps Jiangsu University College of Mechanical and Electrical Engineering Guangzhou University

Valve piezoelectric pumps usually have larger flow rate than that of valveless ones. However, the traditional cantilever valve easily induces stress concentration which impacts the reliability of pumps. Therefore, a cymbal-shaped slotted check valve is proposed to be applied in a piezoelectric pump in order to reduce the stress concentration of the valve and thus improve the reliability of the piezoelectric pump. The structure and working principle of the piezoelectric pump are analyzed; the stress analysis of the cymbal-shaped slotted valve diaphragm is conducted. In addition, finite element software is employed to analyze the difference of the Von-Mises stress between the cymbal-shaped slotted diaphragm and the slotted flat diaphragm. The simulation results show that, the Von-Mises stress of cymbal-shaped slotted diaphragm is smaller than that of the slotted flat one. Furthermore, the cymbal-shaped slotted valve piezoelectric pump is also fabricated, and flow rate experiment is performed. The experimental results indicate that the flow rate of piezoelectric pump working in low frequencies(0 Hz pump reaches its maximum flow rate of 6.6 g/min. The experimental results validate the feasibility of the cymbal-shaped slotted check valve. This research can effectively solve the problem of stress concentration of valve piezoelectric pumps and is helpful for improving the reliability of them.

关键词： Cymbal-shaped slotted piezoelectric pump Valve Stress

Theoretical Analysis and Experimental Verification on Valve-less piezoelectric pump with Hemisphere-segment Bluff-body

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Chinese Journal of Mechanical Engineering 2014年第3期27卷 595-605页

作者： JI Jing ZHANG Jianhui XIA Qixiao WANG Shouyin HUANG Jun ZHAO Chunsheng State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics College of Mechanical and Electrical Engineering Qingdao Agricultural University College of Mechanical and Electronic Engineer Beijing Union University Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences

Existing researches on no-moving part valves in valve-less piezoelectric pumps mainly concentrate on pipeline valves and chamber bottom valves, which leads to the complex structure and manufacturing process of pump channel and chamber bottom. Furthermore, position fixed valves with respect to the inlet and outlet also makes the adjustability and controllability of flow rate worse. In order to overcome these shortcomings, this paper puts forward a novel implantable structure of valve-less piezoelectric pump with hemisphere-segments in the pump chamber. Based on the theory of flow around bluff-body, the flow resistance on the spherical and round surface of hemisphere-segment is different when fluid flows through, and the macroscopic flow resistance differences thus formed are also different. A novel valve-less piezoelectric pump with hemisphere-segment bluff-body （HSBB） is presented and designed. HSBB is the no-moving part valve. By the method of volume and momentum comparison, the stress on the bluff-body in the pump chamber is analyzed. The essential reason of unidirectional fluid pumping is expounded, and the flow rate formula is obtained. To verify the theory, a prototype is produced. By using the prototype, experimental research on the relationship between flow rate, pressure difference, voltage, and frequency has been carried out, which proves the correctness of the above theory. This prototype has six hemisphere-segments in the chamber filled with water, and the effective diameter of the piezoelectric bimorph is 30mm. The experiment result shows that the flow rate can reach 0.50 mL/s at the frequency of 6 Hz and the voltage of 110 V. Besides, the pressure difference can reach 26.2 mm H20 at the frequency of 6 Hz and the voltage of 160 V. This research proposes a valve-less piezoelectric pump with hemisphere-segment bluff-body, and its validity and feasibility is verified through theoretical analysis and experiment.

关键词： valve-less piezoelectric pump hemisphere-segment bluff-body flow resistance

FLOW DIRECTION OF piezoelectric pump WITH NOZZLE/DIFFUSER-ELEMENTS

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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

A Flexible Valve Based piezoelectric pump for High Viscosity Cooling Liquid Transportation

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Transactions of Nanjing University of Aeronautics and Astronautics 2021年第6期38卷 993-1002页

作者： LI Kai LIU Jiaming ZHANG Quan ZHANG Jianhui HUANG Jun WANG Yuan New Combined Power R&D Center Shaanxi Province Aerospace and Astronautics Propulsion Research Institute Co.Ltd.Xi’an 710003P.R.China Research Center of Fluid Machinery Engineering and Technology Jiangsu UniversityZhenjiang 212013P.R.China School of Mechatronic Engineering and Automation Shanghai UniversityShanghai 200072P.R.China College of Mechanical and Electrical Engineering Guangzhou UniversityGuangzhou 510006P.R.China College of Communication Engineering Army Engineering University of PLANanjing 210007P.R.China

A piezoelectric pump with flexible valve has been developed to pump high viscosity cooling liquid in the nanosats thermal control system. The structure of the flexible valve is designed according to the characteristics of the human aortic shape with the aim to simulate the bionic pumping function of the human heart. Dynamic stress-strain features of the flexible valve are analyzed by the finite element method,and the results show that the proposed flexible valve is suitable and functional for the piezoelectric pump. Then the cylinder and diffuser/nozzle piezoelectric pumps based on flexible valves have been developed and fabricated. Experimental results of the output performance indicate that the maximum flow rate of the cylinder piezoelectric pump with flexible valve is 15.38 mL/min,170.77% higher than the diffuser/nozzle piezoelectric pump with flexible valve. The ability of the cylinder piezoelectric pump with flexible valve for transmitting high viscosity liquid has been validated. The piezoelectric pump with flexible valve has potential applications in the nanosats thermal control system.

关键词： piezoelectric pump high viscosity liquid flexible valve cut-off performance pumping performance

THEORY AND EXPERIMENTAL VERIFICATION ON VALVE-LESS piezoelectric pump WITH HEMISPERE-SEGMENT BLUFF-BODY

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THEORY AND EXPERIMENTAL VERIFICATION ON VALVE-LESS PIEZOELEC...

Fluid pump Using a Bar-shaped piezoelectric Transducer

2013全国压电和声波理论及器件技术研讨会

作者： Bing-xin CAO Jian-hui ZHANG Dao-gen CHEN Jing JI State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics College of Mechanical and Electrical Engineering Qingdao Agricultural University

Current valve-less piezoelectric pump always used the special structure of the flow tube on both sides as the no-moving-part *** kinds of pumps are always difficult to miniaturize and low output flow *** order to solve such problems,a hemisphere-segment bluff-body valve-less piezoelectric pump has been put *** order to make a deep studying of such piezoelectric pump’s working principle and better apply it to medical and fuel cell ***,a theoretical analysis about the positive and negative flow resistance has been made in this ***,we manufactured a sample pump and some series of HSBB,which the size of radius is *** these experimental devices we made some experiments on flow resistance and output flow *** experiment results show that with the pressure difference increase,the time difference decreases between the positive and negative flow.

关键词： Valve-less piezoelectric pump Hemisphere-segment bluff-body Flow resistance Finite element method

来源： cnki会议评论

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Chinese Journal of Mechanical Engineering 2011年第6期24卷 1130-1135页

作者： JIN Jiamei WANG Yin YANG Ying ZHANG Jianhui State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China

There are two kinds of piezoelectric pumps:check valve pumps and valve-less *** to use a check valve or not depends upon the application *** achieve large backpressure for higher flow rates,the pump with check valve is ***,adding check valves implies more complex structure and higher probability of valve blocking,*** order to solve the problem,effective driving and transport mechanics with compact construction and reliable service are being *** this paper,using the second-order longitudinal vibration mode of a bar-shaped piezoelectric vibrator for driving fluid,a piezoelectric pump is successfully *** proposed piezoelectric pump consists of coaxial cylindrical shells and a bar-shaped piezoelectric vibrator,which has a disk part and a cone *** lead zirconium titanate ceramic rings fixed in the vibrator are polarized along the thickness *** the second-order longitudinal vibration of the vibrator along its axis is excited,the disk part of the vibrator changes periodically the volume of the chamber and the cone part acts as a pin valve,driving the fluid from the inlet port to the outlet *** elements analysis on the proposed pump model is carried out to verify its operation principle and design by the commercial FEM software *** of the piezoelectric pump were manufactured,assembled,and tested for flow rate and backpressure to validate the concepts of the proposed pump and confirm the simulation results of modal and harmonic *** test results show that the performance of the proposed piezoelectric pump is about 910 mL/min in flow rate with a highest pressure level of 1.5 kPa under 400 V peak-to-peak voltage and 51.7 kHz operating *** is confirmed that this bar-shaped piezoelectric transducer can be effectively applied in fluid transferring mechanism of pump through this research.

关键词： piezoelectric pump check valve longitudinal vibration mode FEM simulation bar-shaped transducer

Effects of Driving Mode on the Performance of Multiple-Chamber piezoelectric pumps with Multiple Actuators

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Chinese Journal of Mechanical Engineering 2015年第5期28卷 954-963页

作者： ZHANG Zhonghua KAN Junwu WANG Shuyun WANG Hongyun MA Jijie JIANG Yonghua Institute of Precision Machinery Zhejiang Normal University

Due to the limited output capability of piezoelectric diaphragm pumps, the driving voltage is frequently increased to obtain the desired output. However, the excessive voltage application may lead to a large deformation in the piezoelectric ceramics, which could cause it to breakdown or become damaged. Therefore, increasing the number of chambers to obtain the desired output is proposed. Using a check-valve quintuple-chamber pump with quintuple piezoelectric actuators, the characteristics of the pump under different driving modes are investigated through experiments. By changing the number and connection mode of working actuators, pump performances in terms of flow rate and backpressure are tested at a voltage of 150 V with a frequency range of 60 Hz -400 Hz. Experiment results indicate that the properties of the multiple-chamber pump change significantly with distinct working chambers even though the number of pumping chambers is the same. pump performance declines as the distance between the working actuators increases. Moreover, pump performance declines dramatically when the working piezoelectric actuator closest to the outlet is involved. The maximum backpressures of the pump with triple, quadruple, and quintuple actuators are increased by 39%, 83%, and 128%, respectively, compared with the pump with double working actuators; the corresponding maximum flow rates of the pumps are simply increased by 25.9%, 49.2%, and 67.8%, respectively. The proposed research offers practical guidance for the effective utilization of the multiple-chamber pumps under different driving modes.

关键词： piezoelectric pump multiple chambers multiple actuators driving mode flow rate backpressure

Design and identification of a double-acting piezoelectric-hydraulic hybrid actuator

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Chinese Journal of Aeronautics 2024年第3期37卷 456-467页

作者： Junjian ZHANG Zhihua FENG Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes University of Science and Technology of ChinaHefei 230026China

Traditional single-acting piezoelectric-hydraulic hybrid actuators usually have the problem of inertial force caused by flow pulsation of the liquid,which degrades their output *** suppress or solve the associated inertial force and enhance its output capabilities,this paper proposes a new type of double-acting piezoelectric-hydraulic hybrid actuator with four check valves acting as mechanical *** new hybrid actuator was fabricated and its output performance was *** the voltage is 700 Vp-pand the bias pressure is 2 MPa,the pulsation ratesδof the new actuator at 400 Hz,500 Hz and 600 Hz are 2.29,2.08 and 1.78,respectively,whileδof the single-acting hybrid actuator under the same conditions are 10.98,11.05 and ***,the liquid pulsation rate of the new hybrid actuator is significantly reduced,which is beneficial for improving the flow uniformity and weakening the influence of inertial force on the hybrid *** strategy ultimately leads to a maximum no-load velocity of 168.1 mm/s at 600 Hz and a maximum blocking force of 141 N at 450 Hz for the new hybrid *** addition,this strategy has the potential to be used in other electrohydrostatic actuators to improve their performance.

关键词： Double-acting Flow pulsation Inertial force piezoelectric actuators piezoelectric devices piezoelectric hydraulic actuation piezoelectric pump