Performance and flow analysis of small piezo pump

Woo, Jangmi; Sohn, Dong Kee; Ko, Han Seo

doi:10.1016/j.sna.2019.111766

Cited by 26 publications

(9 citation statements)

References 18 publications

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“…The fluid used in a pump is one of the most important aspects of the pump. In the previous study, the results of the analysis showed that the flow rate produced by the pump was inversely proportional to the dynamic viscosity [ 27 , 29 , 32 , 33 ]. In this study, a glycerin solution with a viscosity of 22.5 cP was used as the working fluid for which the concentration was 70%, corresponding to an average viscosity of the hydraulic actuator oil.…”

Section: Methodsmentioning

confidence: 99%

Analysis of Stiffness Effect on Valve Behavior of a Reciprocating Pump Operated by Piezoelectric Elements

Woo

Sohn

2020

Micromachines

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This study analyzed the characteristics of a small reciprocating pump with a cantilever valve driven by a piezo actuator. Three types of valves were fabricated to investigate the effect of the valve stiffness on the pump performance and to measure the variation in the flow rate according to the frequency. The flow rate increased with the driving frequency until a certain frequency was reached, and then it started to decrease. The rise in the pressure of the pump was found to increase as the stiffness decreased. The pump performance could be clearly distinguished according to the stiffness of the valve. The observation of the valve movements revealed that the valve opening time did not change regardless of the operating frequency, but it changed with the valve stiffness. The delay in time for the outlet valve increased significantly with an increase in the frequency. It seems that the overlap of the opening time of the inlet valve and the outlet valve plays an important role in pump performance. Therefore, it is advisable to use different designs for the inlet and outlet valves, where the shape and stiffness of the valve are adjusted.

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Section: Methodsmentioning

confidence: 99%

Analysis of Stiffness Effect on Valve Behavior of a Reciprocating Pump Operated by Piezoelectric Elements

Woo

Sohn

2020

Micromachines

Self Cite

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“…Various kinds of check valves have been proposed to improve the performance of piezoelectric pump, such as cantilever valves [18][19][20], two fixed ends valves [21][22][23], wheel valves [24][25][26], and umbrella valves [27][28][29]. With different structure and fixation, check valves show different deformation patterns under pressure and lead to different performance in piezoelectric pump.…”

Section: Introductionmentioning

confidence: 99%

Development of a piezoelectric pump with unfixed valve

Fan

Zhao

Zhang

et al. 2022

J. Micromech. Microeng.

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Piezoelectric pump, driven by piezoelectric actuator, is one of the most promising micropumps in compact system. However, the application of piezoelectric pump is limited by the check valve, which is not efficient enough and needs careful fixation. This work presents a novel design with unfixed check valve, which greatly simplifies the assembly of valve-based piezoelectric pump and improves the output performance. The valve is unfixed with a small gap to obtain variable stiffness at different working stages, making it open more quickly. The piezoelectric pumps with three different valve gaps were designed, fabricated, and tested. The pump with the unfixed valve shows a 25.6% flow rate improvement compared with the fixed check valve without reducing the output pressure. To reveal the mechanism of the flow rate improvement, we investigated the flow resistance and the volumetric efficiency of the piezoelectric pump. The results show that the unfixed valve increases the volumetric efficiency of the piezoelectric pump, which improves the flow rate. The prototype pump achieved the maximum output performance of 162 ml/min and 33 kPa. The power consumption was less than 100 mW, reaching a pump efficiency of 21.7%.

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“…Movable valves include overall opening valves [8], cantilever valves [9], helical linearshaped valves [10], and "E" type valves [11], and all of these can appear in valved PZT pumps. The movable valves listed above are soft structures made of rigid materials.…”

Section: Introductionmentioning

confidence: 99%

Research on a Piezoelectric Pump with Flexible Valves

et al. 2021

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Imitating the structure of the venous valve and its characteristics of passive opening and closing with changes in heart pressure, a piezoelectric pump with flexible valves (PPFV) was designed. Firstly, the structure and the working principle of the PPFV were introduced. Then, the flexible valve, the main functional component of the pump, was analyzed theoretically. Finally, an experimental prototype was manufactured and its performance was tested. The research proves that the PPFV can achieve a smooth transition between valved and valveless by only changing the driving signal of the piezoelectric (PZT) vibrator. The results demonstrate that when the driving voltage is 100 V and the frequency is 25 Hz, the experimental flow rate of the PPFV is about 119.61 mL/min, and the output pressure is about 6.16 kPa. This kind of pump can realize the reciprocal conversion of a large flow rate, high output pressure, and a small flow rate, low output pressure under the electronic control signal. Therefore, it can be utilized for fluid transport and pressure transmission at both the macro-level and the micro-level, which belongs to the macro–micro combined component.

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Performance and flow analysis of small piezo pump

Cited by 26 publications

References 18 publications

Analysis of Stiffness Effect on Valve Behavior of a Reciprocating Pump Operated by Piezoelectric Elements

Analysis of Stiffness Effect on Valve Behavior of a Reciprocating Pump Operated by Piezoelectric Elements

Development of a piezoelectric pump with unfixed valve

Research on a Piezoelectric Pump with Flexible Valves

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