Design and Experimental Study of Valveless Piezoelectric Pump with S-Shaped Flow Channel

In order to improve the output performance of the valveless piezoelectric pump, we use the characteristic that the fluid can produce unequal velocity of flow in different flow channel radii, design and improve a valveless piezoelectric pump with S-shaped flow channel. The influence on the output flow rate of the valveless pump at different radius proportion is analyzed theoretically. The flow states of the S-shaped flow channel radius ratio at 1:1.25, 1:1.5 and 1:1.75 are simulated by finite element simulation method. Finally, the prototypes are made out and the output flow rate is tested then we compare with it that before improvement. The experiment results show that: when the S-shaped flow channel radius ratio is 1:1.25, the valveless piezoelectric pump can reach to the highest flow rate 23.4mL/min and 21.6mL/min under a driving voltage 220V and a frequency 40Hz in forward and reverse. The output performance has a great promotion than before the improvement.