In the stack cooling of household fuel cell system(1kW), cooling water pump has been demanded for compact size, low power consumption and constant delivery-performance of the cooling water. To obtain sufficient performance for practical application in...
In the stack cooling of household fuel cell system(1kW), cooling water pump has been demanded for compact size, low power consumption and constant delivery-performance of the cooling water. To obtain sufficient performance for practical application in above-mentioned area, in this paper, we studied on piston pump using multi-layer PZT actuator(5mm×5mm×18mm). The piston pump used a multi-layer PZT(16㎛ displacement at 100 Vpp) as a reciprocating motion actuator and structure producing resonance to amplify the displacement of a moving piston. The pump composed of two springs and the piston that could be supported a multi-layer PZT. We also decided the mass of moving parts, the stiffness coefficient of two springs with simulation. In this simulation, we predicted the resonant displacement and frequency of the pump. Then, based on the obtained results, without a mechanical amplification, we could make a large displacement.