PIEZOELECTRIC PUMP AND BLOOD-PRESSURE INFORMATION MEASUREMENT DEVICE PROVIDED THEREWITH

摘要

A piezoelectric pump is provided with an actuator containing a piezoelectric element and a vibrating sheet; a first diaphragm, positioned opposite the actuator, with a first connecting hole provided therein; a pump chamber formed by the space between the actuator and the first diaphragm; and a second diaphragm positioned opposite the first diaphragm. The part of the second diaphragm opposite the first connecting hole is provided with an opposing wall portion that prevents a fluid that has been introduced into the pump chamber via the first connecting hole from flowing back towards a suction side via the first connecting hole.

主权项

1. A piezoelectric pump for suctioning a fluid from the outside and discharging the suctioned fluid to the outside, the piezoelectric pump comprising:
an actuator including a piezoelectric element and a vibrating sheet to which the piezoelectric element is attached, wherein the actuator is vibrated by the piezoelectric element being resonantly driven; a first diaphragm having therein a first connecting hole through which the fluid flows, wherein the first diaphragm is vibrated with the vibration of the actuator by being positioned opposite the actuator; a pump chamber formed by the space between the actuator and the first diaphragm, wherein the pump chamber introduces the fluid thereinto from a suction side via the first connecting hole by the actuator being displaced toward a side opposite to where the first diaphragm is located, and the pump chamber delivers the fluid to a discharge side by the actuator being displaced toward the side where the first diaphragm is located; and a backflow preventing portion that prevents the fluid introduced into the pump chamber via the first connecting hole from flowing back toward the suction side via the first connecting hole.