| 摘要 |
PURPOSE:To prevent the flow rate of a pump from lowering, by forming a container for confining the outer periphery of a piezoelectric element from a material having a greater thermal expansion coefficient so that the lowering of amplitude characteristic of the piezoelectric element may be compensated when the temperature of the atmospheric temperature is lowered. CONSTITUTION:An asymmtric type BIMORPH 3 is disposed in a container 1 for a piezoelectric pump, through the intermediary of a seal member 4. This container 1 is arranged to confine the outer periphery of the asymmtric type BIMORPH 3, and is made of a material having a greater thermal expansion coefficient. Therefore, even if the atmospheric temperature lowers and the amplitude characteristic of the asymmetric type BIMORPH 3 is lowered, the container itself contracts to curve the asymmetric type BIMOPRH 3 so that the operating area thereof is increased, thereby it is possible to prevent the flow rate of the pump from lowering.
|
