Abstract
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.
Highlights
Check valves have a hysterical response during high-frequency operation, which results in a degradation of the output performance of piezoelectric pumps
To improve the stability and reliability of the piezoelectric pump, in 2015, Chen et al [24] analyzed the cause of the air block phenomenon from the structure of a wheel check valve and the optimal combination of the wheel check valve structure is obtained within the samples: as the thickness is 0.02 mm, the diameter ratio is 1.2, the wheel check valve opening height gets 252 μm, and within the given bubble volume, the air block probability is less than 2%
Performance Improvement of Piezoelectric Pump by Elastic Inlet and Outlet frequency of the piezoelectric pump with elastic inlet and outlet, it should be less than the resonance frequency
Summary
Check valves have a hysterical response during high-frequency operation, which results in a degradation of the output performance of piezoelectric pumps. The fourth research area is the structural optimization of pump chamber and check valve. Scholars have optimized the structure of the pump chamber and check valve to reduce power loss and improve output performance. Unlike the above studies, this paper attempts to improve the output performance of piezoelectric pumps by reducing the dynamic loading of the liquid in the inlet and outlet pipelines. It is proposed that the dynamic load of the liquid in Micromachines 2020, 11, 735 the inlet and outlet pipelines is one of the most important reasons for reducing the output performance of piezoelectric pumps.
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