Theoretical And Experimental Study Of Piezoelectric Driven Multi-chamber Artificial Heart Pump

Artificial heart pump is a mechanical device which use the external mechanical motion to pump blood to the body tissues.It can replace or partially replace the human heart.A piezoelectric pump conveys the liquid which using piezoelectric oscillator deformed to change the volume of the pump chamber. It has simple structure and enables the digital control. So piezoelectric pump is one of the artificial heart pump key trends.In this paper, on the basis of previous Y-type single entry/exit conduit piezoelectric pump, put forward the piezoelectric pump structure with double entry/exit conduit.By using the Kirchhoff hypothesis, we establish the thin small deflection theory. To make the piezoelectric oscillator maximum kinetic energy during the defonnation and maximum bit make two equal. Numerical calculation formula derived deformation amount of the piezoelectric oscillator, the theoretical amount of change in the volume of the piezoelectric oscillator and voltage is linear. Experimentally determined at different excitation voltage, the maximum displacement of the center point, the farther away from the center of the smaller amount of deformation, the displacement amount of each point of a parabolic-like distribution, the amount of deformation of each point as the voltage increases, almost linear relationship between analytical error experimental test values between mathematics and analytical value causes.According to the basics of hydrodynamics, we combined with the former ANSYS Y-type conduit analysis to explain the relationship of the mass force, pressure, viscosity force, fluid density and acceleration. We analyzed the Y-type conduit valveless piezoelectric pump to achieve a one-way flow of reason and the relationship between the pressure loss coefficient, fluid density and average speed to get valveless piezoelectric pump efficiency formula. Explained that increase the number of valveless piezoelectric pump flow conduit can improve pumping efficiency. Using carved processing technology machining the Y-type single entry/exit conduit piezoelectric pump and Y-type double entry/exit conduit piezoelectric pump with acrylic sheet. Design flow resistance test, experiments show that the time of effluent of both the Y-type single entry/exit conduit piezoelectric pump and Y-type double entry/exit conduit piezoelectric pump are higher than reversed, but the difference is different. Verify that using Y-type double entry/exit conduit piezoelectric pump is more efficiency.In 100V voltage, changing the incentive power frequency and measuring two types of piezoelectric pump pumping rate, obtained that with the change in frequency of the two types of pump flow increasing.The flow of Y-type double entry/exit conduit piezoelectric pump was significantly higher than Y-type single entry/exit conduit piezoelectric pump flow. We prove that Y-type double entry/exit conduit piezoelectric pump is more efficiency.