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 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.

Experimental Studies on Triple-Chamber Piezoelectric Pump with Triple Vibrators under Different Working Modes

2014 ◽  
Vol 915-916 ◽  
pp. 366-371
Author(s):  
Bing Han ◽  
Zhong Hua Zhang ◽  
Shu Yun Wang ◽  
Jun Wu Kan ◽  
Ze Hui Ma ◽  
...  
Keyword(s):  
Structural Parameters ◽  
Experimental Studies ◽  
Test Results ◽  
Piezoelectric Pump ◽  
Output Performance ◽  
Serial Connection ◽  
Working Principle ◽  
Working Frequency ◽  
Working Parameters ◽  
Left Middle

The structure and working principle of serial-connection 3-chamber PZT pump was introduced, and the output performance of the PZT pump was analyzed under different working modes. The pump was tested, respectively, first with each of the three actuators at different location being actuated solely, and then with random two of the three actuators at different location being actuated (in anti-phase) synchronously. The test results show that changing the driving strategy can change the output performance of the piezoelectric pump, with the structural parameters, working parameters and connection Strategy determined. At a voltage of 150 V, the maximal flowrate and optimal working frequencies for the pump under working mode of left, middle, right chambers actuated solely are 9/7.5/11 ml/min and 260/380/720 Hz respectively. The maximal flowrate and the optimal working frequency for the pump under working mode of left and middle chambers/middle and right chambers actuated synchronously are 17/28 ml/min and 460/600 Hz respectively.

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.

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.

scholarly journals Advances in Valveless Piezoelectric Pumps

2021 ◽  
Vol 11 (15) ◽  
pp. 7061
Author(s):  
Qiufeng Yan ◽  
Yongkang Yin ◽  
Wanting Sun ◽  
Jun Fu
Keyword(s):  
Structure Design ◽  
Future Research ◽  
Liquid Cooling ◽  
Piezoelectric Pump ◽  
Pump Design ◽  
Output Pressure ◽  
Output Performance ◽  
Development Tendency ◽  
Important Branch ◽  
Valveless Piezoelectric Pump

Piezoelectric pump design is regarded as a hot research topic in the microfluidic field, and has been applied in liquid cooling, precision machinery and other relevant domains. The valveless piezoelectric pump becomes an important branch of the piezoelectric pump, because it successfully avoids the problem of “pump-lagging of valve” during the valve piezoelectric pump processing. This paper summarizes the development of valveless piezoelectric pumps, and introduces some different configurations of valveless piezoelectric pumps. The structure and material of all kinds of valveless piezoelectric pumps are elaborated in detail, and also the output performance of the pump is evaluated and analyzed with the variations in flow rate and output pressure as reference. By comparing the flow of different types of valveless piezoelectric pumps, the application of valveless piezoelectric pumps is also illustrated. The development tendency of the valveless piezoelectric pump is prospected from the perspective of structure design and machining methods, which is expected to provide novel ideas and guidance for future research.

scholarly journals Investigation on the Influence of Design Parameters of Streamline Flow Tubes on Pump Performance

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Kan Bian ◽  
Zhi Huang ◽  
Jietao Dai ◽  
Fan Zhang ◽  
Xiaosheng Chen ◽  
...  
Keyword(s):  
Flow Rate ◽  
Structure Design ◽  
Simulation Software ◽  
Smooth Transition ◽  
Design Parameters ◽  
Streamline Flow ◽  
Piezoelectric Pump ◽  
Conservation Of Energy ◽  
Pump Performance ◽  
Valveless Piezoelectric Pump

Studies have shown that the valveless piezoelectric pump with streamline flow tubes (VPPSFTs) can increase the flow rate while reducing the vortex, which has a broad application prospect and conforms to the huge potential demand in the fields of medical treatment, sanitation, and health care. The flow runner of the VPPSFT was designed as two segments with a smooth transition between the hyperbola segment and the arc segment. However, the effect of the radius of the arc segment on pump performance is not clear. Therefore, three groups of VPPSFT with arc segments of different curvature radii were designed in this study, and the influence of curvature radius of arc segment on the pump performance was explored. On the basis of the theoretical analysis of fluid continuity and conservation of energy, the structure of VPPSFT was designed, the experimental test was carried out, and the finite element simulation software was used for numerical analysis. The results show that the output performance increases with the increase in the radius of the arc segment, and the maximum flow rate was 116.78 mL/min. The amplitude and the flow rate are almost the same trend as the frequency. This study improves the performance of the valveless piezoelectric pump and provides reference for the structure design of VPPSFT.

scholarly journals Design and Testing of a Valveless Piezoelectric Pump with Conical Vortex Diodes

2020 ◽  
Vol 306 ◽  
pp. 04003
Author(s):  
Lei Zou ◽  
Kai Li ◽  
Jun Huang
Keyword(s):  
Flow Resistance ◽  
Reverse Flow ◽  
Maximum Output ◽  
Piezoelectric Pump ◽  
Element Analysis ◽  
Output Pressure ◽  
Drive Frequency ◽  
The Difference ◽  
Conical Vortex ◽  
Valveless Piezoelectric Pump

The valveless piezoelectric pump delivers fluid based on the difference of flow resistance of internal tube. In this paper, a vortex diode with conical tangential tube is proposed, which possesses the great characteristic of reverse cut-off, and the analysis of the forward and reverse flow resistance of the conical vortex diode is verified by finite element analysis. Then, a valveless piezoelectric pump with conical vortex diodes as the internal channel is designed, and the prototype is manufactured. The results of the output performance experiment show that the maximum output flow rate of the valveless piezoelectric pump is 10.44 g/min at the drive frequency of 45Hz, and the maximum output pressure is 560 Pa at the drive frequency of 35Hz. The proposal of the valveless piezoelectric pump provides a good reference for more new types of valveless piezoelectric pumps.

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 Numerical simulation and experimental study on valveless piezoelectric pump with triangular obstacles

2021 ◽  
Vol 2083 (2) ◽  
pp. 022028
Author(s):  
Yeming Sun ◽  
Yu Wang ◽  
Yiwei Wang
Keyword(s):  
Numerical Simulation ◽  
Flow Rate ◽  
Flow Resistance ◽  
Reverse Flow ◽  
Maximum Output ◽  
Driving Voltage ◽  
Driving Frequency ◽  
Piezoelectric Pump ◽  
Valveless Pump ◽  
Valveless Piezoelectric Pump

Abstract A valve less piezoelectric pump with triangular obstacles is designed and manufactured, which uses piezoelectric vibrator as power source. The working principle and theoretical flow rate of the valveless piezoelectric pump are analyzed, and its flow rate expression is derived. The flow resistance characteristics of triangular obstacles are simulated by numerical simulation. Based on the mass fraction distribution of liquid water, the forward and reverse flow resistance of triangular obstacles and the influence of triangular obstacles on pumping capacity are analyzed. Finally, two groups of test prototypes of the valveless pump are made by using the engraving machine, and the flow measurement test is carried out. The experimental results show that the valveless piezoelectric pump with triangular obstacles can realize the valveless pumping function, and the pumping flow per unit time increases with the increase of triangular obstacles in the channel, and decreases with the increase of the distance between triangular obstacles and the channel. When the driving voltage is 140V and the driving frequency is 10Hz, the maximum output flow of the piezoelectric pump is 16.26ml/min.

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