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1. (WO2015125608) BLOWER

Pub. No.:    WO/2015/125608    International Application No.:    PCT/JP2015/053168
Publication Date: Fri Aug 28 01:59:59 CEST 2015 International Filing Date: Fri Feb 06 00:59:59 CET 2015
IPC: F04B 45/04
F04B 45/047
Applicants: MURATA MANUFACTURING CO., LTD.
株式会社村田製作所
Inventors: TANAKA, Nobuhira
田中伸拓
Title: BLOWER
Abstract:
A piezoelectric blower (100) equipped with a valve (80), a case (17), an oscillation plate (41), and a piezoelectric element (42). Together with the case (17), the oscillation plate (41) forms a cylindrical blower chamber (31) which is sandwiched therebetween, in the thickness direction of the oscillation plate (41). Furthermore, the oscillation plate (41) and the case (17) are formed such that the blower chamber (31) has a radius (a). The piezoelectric element (42) causes the oscillation plate (41) to undergo concentric circular bending oscillation with a resonance frequency (f). When the acoustic velocity of air passing through the blower chamber (31) is c and the value satisfying the relationship a first-kind Bessel function J0(k0) = 0 is k0, the radius (a) of the blower chamber (31) and the resonance frequency (f) of the oscillation plate (41) satisfy the relationship 0.8×(k0c)/(2π)≤af≤1.2×(k0c)/(2π).