US 12,270,411 B2
Propeller fan, blower, and air conditioner
Katsuyuki Yamamoto, Tokyo (JP); Takuya Teramoto, Tokyo (JP); Atsushi Kono, Tokyo (JP); and Takahide Tadokoro, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 18/687,560
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Nov. 5, 2021, PCT No. PCT/JP2021/040839
§ 371(c)(1), (2) Date Feb. 28, 2024,
PCT Pub. No. WO2023/079697, PCT Pub. Date May 11, 2023.
Prior Publication US 2025/0003420 A1, Jan. 2, 2025
Int. Cl. F04D 29/38 (2006.01)
CPC F04D 29/384 (2013.01) [F05D 2240/303 (2013.01); F05D 2240/304 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A propeller fan comprising:
a rotation shaft;
a blade rotating around the rotation shaft; and
a semi-open bell mouth covering a part of the blade,
at the same position in an axial direction of the rotation shaft, a first locus connecting a leading edge of the blade and an outer peripheral end of the blade being tilted with respect to a second locus connecting a center of the rotation shaft and the leading edge so that the outer peripheral end side is inclined toward a trailing side, and
the tilt of the first locus with respect to the second locus being formed at least in a region in which the semi-open bell mouth and the blade do not overlap, and the tilt to the trailing side of the first locus with respect to the second locus being smaller in a region in which the semi-open bell mouth and the blade overlap than in the region in which the semi-open bell mouth and the blade do not overlap.