基于放大机构的压电叠堆泵设计分析及试验OA北大核心CSTPCD

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 amplifica-tion mechanism was proposed by integrating the performance advantages of lever hinge and triangular hinge structures.Theoretical amplification factor analysis,ANSYS simulation analysis,fluid-solid cou-pling 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 ana-lyzed,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.