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1. (WO2018220808) CENTRIFUGAL FAN, AIR CONDITIONER, AND CENTRIFUGAL FAN MANUFACTURING METHOD

Pub. No.:    WO/2018/220808    International Application No.:    PCT/JP2017/020550
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Sat Jun 03 01:59:59 CEST 2017
IPC: F04D 29/28
F04D 29/30
Applicants: MITSUBISHI ELECTRIC CORPORATION
三菱電機株式会社
Inventors: YUZE, Hiroyuki
湯瀬 寛之
Title: CENTRIFUGAL FAN, AIR CONDITIONER, AND CENTRIFUGAL FAN MANUFACTURING METHOD
Abstract:
The present invention inhibits a decrease in the strength of the welded sections of blades and a main plate and the welded sections of the blades and a shroud in order to maintain the strength of the welded sections of the blades even if an excessive external force is exerted on a centrifugal fan. The centrifugal fan comprises: a main plate rotationally driven by a fan motor; a shroud disposed to face the main plate; and a plurality of blades installed between the main plate and the shroud. The blades include an end face that abuts the welded surface formed on the main plate and/or the shroud, and the end face has formed thereon a projection that extends in a linear shape or curved shape from the front edge of the blade to the rear edge. The projection is formed of a first projection positioned on the front edge side of the blade, a second projection positioned on the rear edge side of the blade, and a third projection positioned between the first projection and the second projection.