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1. (WO2018127970) FAN, BLOWER, AND ELECTRIC MOTOR

Pub. No.:    WO/2018/127970    International Application No.:    PCT/JP2017/000271
Publication Date: Fri Jul 13 01:59:59 CEST 2018 International Filing Date: Sat Jan 07 00:59:59 CET 2017
IPC: F04D 29/30
F04D 29/34
F04D 29/66
Applicants: MITSUBISHI ELECTRIC CORPORATION
三菱電機株式会社
Inventors: OKUDE Yusuke
奥出 裕介
HAGA Seiji
羽下 誠司
Title: FAN, BLOWER, AND ELECTRIC MOTOR
Abstract:
Provided is a centrifugal fan (10) in which: one blade from among 11 blades is configured as a reference blade (W1); a first pitch angle (θ1) is formed between the reference blade (W1) and a blade that is adjacent in a first direction (X) around a rotation shaft (30); and five of the first pitch angles (θ1) are arranged adjacently in the first direction (X). A second pitch angle (θ2) which differs from the first pitch angle (θ1) is formed between the reference blade (W1) and a blade that is adjacent in a second direction (Y) opposite the first direction (X), and six of the second pitch angles (θ2) are arranged adjacently in the second direction (Y). A first combined pitch angle obtained by adding up the five first pitch angles (θ1) and a second combined pitch angle obtained by adding up the six second pitch angles (θ2) are different from each other, and thus the noise of the centrifugal fan (10) is reduced.