Search International and National Patent Collections

1. (WO2018123519) PROPELLER FAN

Pub. No.:    WO/2018/123519    International Application No.:    PCT/JP2017/044226
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Sat Dec 09 00:59:59 CET 2017
IPC: F04D 29/38
Inventors: IWATA Tooru
岩田 透
TOMIOKA Hirotaka
富岡 洋峻
In a blade (20) of a propeller fan (10), the position on a blade chord (31) where warpage height reaches a maximum is designated as a maximum warpage position A, and the ratio of the distance d from a leading edge (23) to the maximum warpage position A with respect to the blade chord length c is designated as the maximum warpage position ratio (d/c). A hub-side end part of the blade (20) is designated as a blade base, and an outer-peripheral-side end of the blade (20) is designated as a blade end. In the blade (20), the maximum warpage position ratio (d/c) monotonically increases toward the blade end from a reference blade cross section positioned between the blade base and the blade end, and reaches a maximum value at the blade end. Configuring the blade in this manner increases the fan efficiency of the propeller fan.