scholarly journals Research on Inlet and Outlet Structure Optimization to Improve the Performance of Piezoelectric Pump

Micromachines ◽  
2020 ◽  
Vol 11 (8) ◽  
pp. 735 ◽  
Author(s):  
Xiaolong Zhao ◽  
Dingxuan Zhao ◽  
Jiantao Wang ◽  
Tao Li
Keyword(s):  
Flow Rate ◽  
Dynamic Load ◽  
Maximum Flow ◽  
Fluid Simulation ◽  
Maximum Output ◽  
Piezoelectric Pump ◽  
Pump System ◽  
Output Performance ◽  
Pump Inlet ◽  
Application Requirements

As piezoelectric pumps are used in more fields, they are gradually failing to meet the application requirements due to their low output performance. Therefore, improving the output performance of piezoelectric pumps helps to expand their applications. This paper argued that the dynamic load of liquid in the inlet and outlet pipelines was an important factor that weakened the performance of piezoelectric pumps. Therefore, in order to reduce the dynamic load, it was proposed to replace the conventional piezoelectric pump inlet and outlet by an elastic inlet and outlet. After introducing the structure and working principle of elastic inlet and outlet, the mechanism of reducing the dynamic load by elastic inlet and outlet was analyzed. Then, the influence of the elastic cavity height on the performance of the piezoelectric pump was studied from both fluid simulation and theoretical analysis. Finally, several prototypes were made. The effectiveness of the elastic inlet and outlet on improving the performance of the prototype and the effect of the elastic cavity height on the performance of the prototype were tested, respectively. The test results showed that the elastic inlet and outlet effectively improved the flow rate and output backpressure without increasing the maximum output backpressure. The maximum flow rate of the pump system without load was increased by 36%. In addition, the elastic cavity height adversely affected the flow rate and output backpressure of the prototypes, but had no effect on the maximum output backpressure. In summary, the elastic inlet and outlet can effectively increase the output performance of the piezoelectric pump, but the design height should be appropriately reduced.

scholarly journals A Theoretical and Experimental Study of a Piezoelectric Pump with Two Elastic Chambers

Sensors ◽  
2020 ◽  
Vol 20 (20) ◽  
pp. 5867
Author(s):  
Xiaolong Zhao ◽  
Dingxuan Zhao ◽  
Qinghe Guo
Keyword(s):  
Flow Rate ◽  
Dynamic Load ◽  
Structural Parameters ◽  
Experimental Tests ◽  
Maximum Output ◽  
Piezoelectric Pump ◽  
Piezoelectric Vibrator ◽  
Output Performance ◽  
Key Factor ◽  
The Impact

The paper is a continuation of our work on the dynamic load in piezoelectric pumps. In the study, the dynamic load of liquid in the pipelines was proposed as a key factor that limits the output performance of piezoelectric pumps. To decrease the dynamic load, a piezoelectric pump with two elastic chambers was proposed in our previous published work. In this paper, the performance and key parameters of the piezoelectric pump with two elastic chambers were studied through theoretical analyses and experimental tests. After establishing the mathematical model of the piezoelectric pump with two elastic chambers, the paper theoretically analyzed the performance of the pump and the effect of different structural parameters on the performance. Then prototypes with a range of structural parameters were developed and tested. As revealed from the test results, the elastic chamber effectively decreased the dynamic load of the liquid in the pipelines and the flow rate of the prototype with two elastic chambers was higher than that of the prototype with one or no elastic chamber. However, the elastic chamber did not lead to the increase in the maximum output backpressure of the prototype. Adopting an elastic diaphragm exhibiting a smaller stiffness or a larger diameter could help decrease the dynamic load of the liquid. The elastic chamber more significantly impacted the flow rate of the piezoelectric pump with long pipelines. The pump chamber height had a significant effect on the output performance of the piezoelectric pump with two elastic chambers, which is consistent with the conventional piezoelectric pump. At the height of 0.2 mm, the flow rate of the prototype with two elastic chambers was peaked at 7.7 mL/min; at the height of 0.05 mm, the output backpressure reached the highest of 28.2 kPa. The dynamic load could decrease the amplitude of the piezoelectric vibrator, whereas the prototype with two elastic chambers could effectively reduce the impact of dynamic load on the piezoelectric vibrator. The flow rate decreased almost linearly with the backpressure. Under the same backpressure, the flow rate of the prototype with two elastic chambers was higher than that of the prototype without elastic chamber, and the flow rate difference between the two prototypes gradually decreased with the backpressure.

scholarly journals Improving Output Performance of a Resonant Piezoelectric Pump by Adding Proof Masses to a U-Shaped Piezoelectric Resonator

Micromachines ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 500
Author(s):  
Jian Chen ◽  
Wenzhi Gao ◽  
Changhai Liu ◽  
Liangguo He ◽  
Yishan Zeng
Keyword(s):  
Flow Rate ◽  
Maximum Flow ◽  
Working Fluid ◽  
Driving Voltage ◽  
Piezoelectric Resonator ◽  
Piezoelectric Pump ◽  
Compact Structure ◽  
Output Performance ◽  
Volume Efficiency ◽  
Working Efficiency

This study proposes the improvement of the output performance of a resonant piezoelectric pump by adding proof masses to the free ends of the prongs of a U-shaped piezoelectric resonator. Simulation analyses show that the out-of-phase resonant frequency of the developed resonator can be tuned more efficiently within a more compact structure to the optimal operating frequency of the check valves by adjusting the thickness of the proof masses, which ensures that both the resonator and the check valves can operate at the best condition in a piezoelectric pump. A separable prototype piezoelectric pump composed of the proposed resonator and two diaphragm pumps was designed and fabricated with outline dimensions of 30 mm × 37 mm × 54 mm. Experimental results demonstrate remarkable improvements in the output performance and working efficiency of the piezoelectric pump. With the working fluid of liquid water and under a sinusoidal driving voltage of 298.5 Vpp, the miniature pump can achieve the maximum flow rate of 2258.9 mL/min with the highest volume efficiency of 77.1% and power consumption of 2.12 W under zero backpressure at 311/312 Hz, and the highest backpressure of 157.3 kPa under zero flow rate at 383 Hz.

The characters exploration of a piezoelectric pump with fishtail-shaped bluffbody

2021 ◽  
pp. 1045389X2110386
Author(s):  
Yi Hou ◽  
Lipeng He ◽  
Zheng Zhang ◽  
Baojun Yu ◽  
Hong Jiang ◽  
...  
Keyword(s):  
Flow Rate ◽  
Preliminary Investigation ◽  
Maximum Flow ◽  
Theoretical Explanation ◽  
Maximum Flow Rate ◽  
Bluff Bodies ◽  
Conical Flow ◽  
Piezoelectric Pump ◽  
Valveless Piezoelectric Pump ◽  
Shape And Size

This paper focuses on a new structure in the valveless piezoelectric pump, which has a combination structure of the conical flow channel and two fishtail-shaped bluffbodies in the chamber of the pump. The fishtail-shaped bluffbody is inspired by the shape of the swimming fish to diminish the backflow and optimize the performance of the pump. The performance is studied by changing the shape and size of the inlet and outlet, the bluff bodies’ height and the space between two bluff bodies. The results show that the 3 mm × 3 mm square inlet, 3 mm diameter round outlet, 3 mm height of bluffbodies, 6.8 mm pitch of bluffbodies has a best performance in all 10 prototypes, which implements a maximum flow rate of 87.5 ml/min at 170 V 40 Hz with a noise of 42.6 dB. This study makes a preliminary investigation and theoretical explanation for the subsequent optimization of this structure, improved the performance of the valveless piezoelectric pump, broaden the thinking of the design for the bluffbody for better performance of the valveless piezoelectric pump.

scholarly journals Design and Experimental Verification of a PZT Pump with Streamlined Flow Tubes

2019 ◽  
Vol 9 (18) ◽  
pp. 3881 ◽  
Author(s):  
Ming Tang ◽  
Qibo Bao ◽  
Jianhui Zhang ◽  
Qingshuang Ning ◽  
Chaobin Chen ◽  
...  
Keyword(s):  
Flow Rate ◽  
Flow Resistance ◽  
Maximum Amplitude ◽  
Maximum Flow ◽  
Flow Stability ◽  
Rate Equations ◽  
Flow Tube ◽  
Piezoelectric Pump ◽  
Streamlined Flow ◽  
Frequency Relationship

In this paper, a streamlined flow tube valveless piezoelectric pump (SLFT PZT pump) is proposed to modify the single flow trend and improve the fluid flow stability. Firstly, the structural and working principle of the streamlined flow tube, which accounts for changing the flow trend and improving the flow stability, were analyzed. The flow resistance and flow rate equations were established. Secondly, the pressure and velocity fields of the tube were simulated. These simulated results were consistent with the theoretical results. Thirdly, the flow resistance of the flow tube was tested with pressure differences of 1000 Pa, 1200 Pa, 1400 Pa and 1600 Pa respectively. The trend of the result curves was consistent with the simulated results. The amplitude-frequency relationship and the flow-rate-frequency relationship were also tested, both result curves highly corelate. The maximum amplitude was 0.228 mm (10 Hz, 120 V), and the maximum flow rate was 17.01 mL/min (10 Hz, 100 V). Finally, the theoretical flow rate of the SLFT PZT pump was calculated at 100 V and 120 V. These results roughly fitted with the experimental results. The streamlined flow tube could change the internal flow trend that remarkably improved the flow stability. Therefore, it promoted the application of the valveless PZT pump in living cells, biomedical and polymer delivery.

Valveless Piezoelectric Pump with Reverse Diversion Channel

Electronics ◽  
2021 ◽  
Vol 10 (14) ◽  
pp. 1712
Author(s):  
Yongming Yao ◽  
Zhicong Zhou ◽  
Huiying Liu ◽  
Tianyu Li ◽  
Xiaobin Gao
Keyword(s):  
Reverse Flow ◽  
Structural Parameters ◽  
Maximum Flow ◽  
Simulation Software ◽  
Return Flow ◽  
Piezoelectric Pump ◽  
Output Performance ◽  
Diversion Channel ◽  
Tesla Valve ◽  
Valveless Piezoelectric Pump

In order to reduce backflow and improve output performance, a valveless piezoelectric pump with a reverse diversion channel was produced. The channel was designed based on the structure of the Tesla valve, which has no moving parts and can produce a high-pressure drop during reverse flow. Therefore, this special flowing channel can reduce the backflow of a valveless piezoelectric pump, which has the characteristic of one-way conduction. This work first revealed the relationship between the main structural parameters of the Tesla valve and the kinetic energy difference of liquid. Then, by using simulation software, the structure was verified to have the characteristics of effective suppression of the backflow of valveless piezoelectric pumps. Through setting multiple simulations, some important parameters that include the optimal height between the straight channels (H), the optimal angle (α) between the straight channel and the inclined channel, as well as the optimal radius (R) of the channel were confirmed. Finally, a series of prototypes were fabricated to test the output performance of this valveless piezoelectric pump. Comparing the experimental results, the optimal parameters of the Tesla valve were determined. The results suggest that when the parameters of the Tesla valve were H = 8 mm, α = 30°, and R = 3.4 mm, the output performance of this piezoelectric pump became best, which had a maximum flow rate of 79.26 mL/min with a piezoelectric actuator diameter of 35 mm, an applied voltage of 350 Vp-p, and a frequency of 28 Hz. The effect of this structure in reducing the return flow can be applied to fields such as agricultural irrigation.

scholarly journals Equivalent Circuit Modeling for a Valveless Piezoelectric Pump

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 2881 ◽  
Author(s):  
Jianhui Zhang ◽  
Yuan Wang ◽  
Jun Huang
Keyword(s):  
Equivalent Circuit ◽  
Flow Rate ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
Experimental Results ◽  
Driving Voltage ◽  
Piezoelectric Pump ◽  
Pump System ◽  
Field Problem ◽  
Valveless Piezoelectric Pump

Various kinds of the models had been proposed to explain the relationship between the performance and the structural parameters of valveless piezoelectric pumps, so as to evaluate the functional performance such devices. Among the models, the equivalent circuit model, which converts the multi-field problem of a valveless piezoelectric pump system into a simple circuit problem, is the most simple and clear one. Therefore, the proposed structure and working principle of the valveless piezoelectric pump with multistage Y-shape treelike bifurcate tubes are analyzed; then, the equivalent circuit model of the valveless piezoelectric pump is established based on the working principles of this pump and liquid-electric analogy theory. Finally, an experimental study of the pump is carried out, with a comparative analysis of the experimental results and the simulation results of the generated equivalent circuit. The experimental results show that with a driving voltage of 100 V and frequency of 6 Hz, the maximum flow rate of the valveless piezoelectric pump is 1.16 mL/min. Meanwhile, the output current of equivalent circuit also reaches its peak at the frequency of 6 Hz, therefore, indicating a good predictive ability of this model in calculating the maximum output flow rate and best working frequency of valveless piezoelectric pumps.

A flexible valve based piezoelectric pump for high viscosity liquid transportation

2020 ◽  
Author(s):  
Jun Huang ◽  
Kai Li ◽  
Jianhui Zhang ◽  
Jiaming Liu ◽  
Quan Zhang ◽  
...  
Keyword(s):  
Dynamic Stress ◽  
Maximum Flow ◽  
High Viscosity ◽  
The Finite Element Method ◽  
Piezoelectric Pump ◽  
Biomedical Analysis ◽  
Pump Design ◽  
Output Performance ◽  
Analysis System ◽  
Pumping Function

Abstract A piezoelectric pump with flexible valve has been developed to pump high viscosity liquid in various biomedical environments. The structure of the flexible valve is designed according to the characteristics of the human aortic shape which aims to simulate the bionic pumping function of the human heart. Dynamic stress-strain features of the flexible valve is analysed by the finite element method , and the results show that the proposed flexible valve is suitable and functional for the piezoelectric pump design. Then the cylinder and diffuser/nozzle piezoelectric pumps based on flexible valves have been developed and fabricated. The output performance experiments indicate that the maximum flow rate of the cylinder piezoelectric pump with flexible valve is 15.38 mL/min, which is 170.77% higher than the diffuser/nozzle piezoelectric pump with flexible valve. The outstanding ability of the cylinder piezoelectric pump with flexible valve for transmitting high viscosity liquid has been validated. Such advantages of the proposed piezoelectric pump with flexible valve made it featuring the potential application ability in living cells delivery, biomedical analysis system and fine chemical industry.

A miniature piezomembrane hydraulic pump with decreasing chambers in succession

2020 ◽  
pp. 1045389X2095361
Author(s):  
Mai Yu ◽  
Song Chen ◽  
Jun Wu Kan ◽  
Zhong Hua Zhang ◽  
Chao Ping Qian ◽  
...  
Keyword(s):  
Flow Rate ◽  
External Load ◽  
Maximum Flow ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Maximum Flow Rate ◽  
Hydraulic Pump ◽  
Optimum Flow Rate ◽  
Output Performance ◽  
High Energy Conversion Efficiency

A miniature piezomembrane hydraulic pump with decreasing chambers in succession (PHPDCS) is presented. The number of chambers in PHPDCS decreases successively in two serial stages. The first stage consists of two chambers in parallel while the second stage consists of only one chamber. The proposed PHPDCS has the comprehensive advantages of serial and parallel connection of multi-chamber and has a high energy conversion efficiency. The prototype of PHPDCS is designed and manufactured. The output performance of PHPDCS under different external loads is investigated by experiments. Experimental results indicate that the optimum flow rate of the proposed PHPDCS is obtained when phase difference between two serial stages is 180°. The output performance of PHPDCS is superior to that of traditional piezoelectric pumps with two chambers in serial (PPCS). At 50 Hz, the maximum flow rate of PHPDCS under external load of 5 kPa is more than twice as high as that of PPCS. Under the external load of 10 kPa, the maximum flow rate of PHPDCS reaches 6.87 mL/min, whereas PPCS has no flow rate output.

scholarly journals A large opening and high flow rate  piezoelectric pump with straight arm wheeled check valve

2020 ◽  
Author(s):  
Lipeng He ◽  
Xiaoqiang Wu ◽  
Zhe Wang ◽  
Da Zhao ◽  
Jianming Wen ◽  
...  
Keyword(s):  
Flow Rate ◽  
Cooling System ◽  
Check Valve ◽  
Maximum Flow ◽  
Low Flow ◽  
Piezoelectric Pump ◽  
Cooling Systems ◽  
Microelectronic Devices ◽  
Valve Opening ◽  
Large Opening

Abstract Piezoelectric pumps are applied in cooling systems of microelectronic devices because of their small size. However, cooling efficiency is limited by low flow rate. A Straight arm wheeled check valve made of silica gel was proposed, which can improve flow rate of piezoelectric pump, solve the influence of glue aging on the sealing ability of a wheeled check valve and reduce the size of piezoelectric pump. This paper discusses the influence of valve arm number (N=2, 3 and 4), valve arm width (W=1.0, 1.2 and 1.4mm) and valve thickness (T=0.6, 0.8 and 1.0mm) on flow rate characteristics of piezoelectric pumps. When valve opening rises, the flow rate increases. The simulation results show that valves with 2 valve arms, 0.6mm valve thickness and 1.0mm valve arm width have maximum valve opening. Experimental results show that piezoelectric pumps with different valve parameters have different optimal frequencies. In addition, maximum flow rate is 431.6mL/min at 220V and 70Hz. This paper provides a reference for the application of piezoelectric pump in cooling system.

scholarly journals MODELAGEM DA REDUÇÃO DE VAZÃO EM PARCELAS DE IRRIGAÇÃO DEVIDO AO INCREMENTO DA PERDA DE CARGA DO SISTEMA DE FILTRAGEM

Irriga ◽  
2018 ◽  
Vol 21 (3) ◽  
pp. 425
Author(s):  
Marinaldo Ferreira Pinto ◽  
Dinara Grasiela Alves ◽  
Ezequiel Saretta ◽  
Tarlei Arriel Botrel
Keyword(s):  
Flow Rate ◽  
Model Simulation ◽  
Maximum Flow ◽  
Head Loss ◽  
Pump System ◽  
Pumping System ◽  
Total Head ◽  
System 2 ◽  
Line Pressure ◽  
E Mail

MODELAGEM DA REDUÇÃO DE VAZÃO EM PARCELAS DE IRRIGAÇÃO DEVIDO AO INCREMENTO DA PERDA DE CARGA DO SISTEMA DE FILTRAGEM  MARINALDO FERREIRA PINTO1; DINARA GRASIELA ALVES1; EZEQUIEL SARETTA2 E TARLEI ARRIEL BOTREL3 1Departamento de Engenharia, Instituto de Tecnologia, UFRRJ, Rodovia BR 465, km 7, 23890-000, Seropédica, Rio de Janeiro, Brasil, e-mail: [email protected], [email protected] Acadêmica do Campus Cachoeira do Sul da UFSM, CEP 96506-322, Cachoeira do Sul, RS. E-mail: [email protected] de Engenharia de Biossistemas, ESALQ/USP, Avenida Pádua Dias, 11, 13418-900, Piracicaba, São Paulo, Brasil, e-mail: [email protected]  1      RESUMO A perda de carga nos filtros pode alterar a altura manométrica total de um sistema de bombeamento e consequentemente a pressão na entrada das parcelas de irrigação, podendo comprometer a uniformidade de aplicação e lâmina de irrigação. O objetivo deste trabalho foi desenvolver um modelo para simulação do efeito do incremento da perda de carga no sistema de filtragem na vazão de uma parcela de irrigação. Foram consideradas duas situações: a) o sistema de bombeamento apresenta um dispositivo para regulação da altura manométrica total; e b) o sistema de bombeamento não dispõe de tal recurso. Analisou-se diferentes valores de expoente de vazão dos emissores, diâmetros e/ou comprimentos de adutoras, pressão de trabalho e incremento da perda de carga no sistema de filtragem. Foram considerados uma motobomba com vazão nominal de 10 m3 h-1 e um sistema de filtragem com vazão nominal de 2 m3 h-1. A partir das simulações foi possível se determinar o limite de incremento da perda de carga que proporciona uma redução de vazão máxima admitida para cada cenário avaliado. Esses valores foram comparados com a perda de carga máxima admitida, sendo adotado o menor valor de perda de carga, entre esses dois critérios. PALAVRAS-CHAVE: modelo hidráulico; simulação; microirrigação PINTO, M. F.; ALVES, D. G.; SARETTA, E.; BOTREL, T. A.AN APPROACH FOR FLOW REDUCTION OF IRRIGATION BLOCKS DUE TO INCREASING HEAD LOSS OF THE FILTERING SYSTEM  2      ABSTRACT The head loss in filters can change the total head of the pump system and consequently the pressure on the irrigation block inlet. It may compromise the uniformity of application and the irrigation depth. The aim of this study was to develop a model to simulate the effect of head loss increasing of filtering system on the flow of an irrigation block. It considered two situations: a) pumping system with a device for regulating the total head; and, b) pumping without system for regulating the total head. We analyzed different values of exponent flow emitters, diameters and/or lengths of main line, pressure and head loss increasing in the filtering system. It considered a pump with nominal flow rate of 10 m3 h-1 and a filtering system with nominal flow rate of 2 m3 h-1. From the simulations, it was possible to determine the limit of head loss increasing that provides a range of maximum flow allowed for each scenario. These values were compared with the maximum permissible head loss, and adopted the lower value of head loss, between these two criteria. Keywords: hydraulics model; simulation; microirrigation 

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