Patent ID: 11867167
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  H | IPC F  H

Claim 0:
1. A piezoelectric pump comprising:
a first top plate having a first opening;
a second top plate arranged as spaced from the first top plate and having a second opening;
a diaphragm arranged between the first top plate and the second top plate and having a piezoelectric element attached thereto;
a first side wall coupling the first top plate and the diaphragm together and defining a first pump chamber between the first top plate and the diaphragm; and
a second side wall coupling the second top plate and the diaphragm together and defining a second pump chamber between the second top plate and the diaphragm, wherein
the diaphragm has a vibrating part having the piezoelectric element attached thereto, a frame part enclosed between the first side wall and the second side wall, and a connecting part connecting the vibrating part and the frame part,
the connecting part defines a third opening, and the third opening communicates the first pump chamber with the second pump chamber,
the frame part has a fourth opening, and the fourth opening communicates with the third opening and also communicates with outside, and
the piezoelectric pump further includes
in the first pump chamber, an annular first valve provided as spaced from the first opening in in a planar view from a main surface of the first top plate toward a main surface of the second top plate so as to surround the first opening, and
in the second pump chamber, an annular second valve provided as spaced from the second opening in the planar view from a main surface of the first top plate toward a main surface of the second top plate so as to surround the second opening.