Piezoelectric micro-blower
AssigneeMurata Manufacturing Co., Ltd.
InventorsAtsuhiko HIRATA, Gaku KAMITANI
Life of this patent
Estimating the term…
Abstract
A blower body is provided with a first wall and a second wall, and openings are provided in the walls at positions facing the approximate center of a diaphragm. An inflow passage that allows the openings to communicate with the outside is arranged between the two walls. When the diaphragm is vibrated in response to a voltage applied to a piezoelectric element, the first wall vibrates near the opening and sucks in air from the inflow passage so that the air can be ejected from the opening. A plurality of branch passages which provide sound absorption are connected to an intermediate section of the inflow passage so as to prevent noise generated near the opening from leaking from an inlet.
Claims6
A piezoelectric micro-blower comprising:
- a blower body;
- a diaphragm having an outer periphery fixed to the blower body and including a piezoelectric element;
- and
- a blower chamber provided between the blower body and the diaphragm;
- wherein
- the diaphragm is arranged to be bent in response to application of a voltage to the piezoelectric element so as to transport a compressible fluid;
- the piezoelectric micro-blower further comprises:
- a first wall of the blower body, the first wall and the diaphragm defining the blower chamber therebetween;
- a first opening provided in a section of the first wall that faces an approximate center of the diaphragm, the first opening being arranged to provide communication between an inside and an outside of the blower chamber;
- a second wall of the blower body provided opposite the blower chamber with the first wall therebetween and separated from the first wall by a distance;
- a second opening provided in a section of the second wall that faces the first opening;
- an inflow passage provided between the first wall and the second wall and having an outer end in communication with the outside and an inner end connected to the first opening and the second opening;
- and
- a plurality of branch passages each having a closed end and being connected to an intermediate section of the inflow passage.
A piezoelectric micro-blower comprising:
- a blower body;
- a diaphragm having an outer periphery fixed to the blower body and including a piezoelectric element;
- and
- a blower chamber provided between the blower body and the diaphragm;
- wherein
- the diaphragm is arranged to be bent in response to application of a voltage to the piezoelectric element so as to transport a compressible fluid;
- and
- the piezoelectric micro-blower further comprises:
- a first wall of the blower body, the first wall and the diaphragm defining the blower chamber therebetween;
- a first opening provided in a section of the first wall that faces an approximate center of the diaphragm, the first opening being arranged to provide communication between an inside and an outside of the blower chamber;
- a second wall provided opposite the blower chamber with the first wall therebetween and separated from the first wall;
- a second opening provided in a section of the second wall that faces the first opening;
- an inflow passage provided between the first wall and the second wall and having an outer end in communication with the outside and an inner end connected to the first opening and the second opening;
- a third wall separated from the second wall by a desired distance;
- an outflow passage provided between the second wall and the third wall and having an outlet at one end that is in communication with the outside and another end connected to the second opening;
- and
- a plurality of branch passages each having a closed end and being connected to an intermediate section of the outflow passage.
Dependencies are inferred from the claim text.