Design analysis and test of piezoelectric stack pump based on amplification mechanism

In order to overcome the shortcoming of small output displacement of the piezoelectric stack and limited pumping capacity of the pump oscillator, a piezoelectric stack pump based on an amplification mechanism was proposed by integrating the performance advantages of lever hinge and triangular hinge structures. Theoretical amplification factor analysis, ANSYS simulation analysis, fluid-solid coupling analysis, and pumping performance experimental measurements were conducted. The results show that the simulation magnification of the piezoelectric stack pump is 20.3, with a relative error of 11.7% from the theoretically calculated value. ANSYS simulation analysis shows that the bending frequency corresponding to the second-order frequency of the pump oscillator is 1 356.30 Hz, and the fluid-solid coupling analysis of the piezoelectric stack pump at this operation frequency shows that the pumping flow rate of the pump is 41.78 mL/min. Based on the above research and analysis, the piezoelectric stack pump prototype was trial-produced and a pumping performance test was carried out. It is found that under a driving voltage of 50 V, the measured pumping flow rate is 32.50 mL/min and the relative error between the simulation flow and the test flow is 28.5%, and the cause of the error is then analyzed, for which the maximum pressure difference is 13.7 mm. The test results have good stability, which verifies the reliability of the simulation data, and provides a reliable reference for further research on the new amplification mechanisms and piezoelectric stack pumps.