US 12,258,976 B2
Axial fan
Yuki Furutani, Hiratsuka (JP)
Assigned to KABUSHIKI KAISHA TOSHIBA, Tokyo (JP); and Toshiba Carrier Corporation, Kawasaki (JP)
Filed by KABUSHIKI KAISHA TOSHIBA, Tokyo (JP); and Toshiba Carrier Corporation, Kawasaki (JP)
Filed on Oct. 24, 2023, as Appl. No. 18/493,093.
Claims priority of application No. 2023-021721 (JP), filed on Feb. 15, 2023.
Prior Publication US 2024/0271637 A1, Aug. 15, 2024
Int. Cl. F04D 29/54 (2006.01); F04D 19/00 (2006.01); F04D 29/52 (2006.01)
CPC F04D 29/526 (2013.01) [F04D 19/002 (2013.01); F04D 29/541 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An axial fan, comprising:
an impeller including a rotating part, and a blade part connected to the rotating part;
a bellmouth including
a flat part orthogonal to an extension direction of a rotation axis of the rotating part;
a rising part rising from the flat part;
a corner portion connecting the flat part and the rising part; and
an opening along which the rising part extends, the impeller being located in the opening, the rising part surrounding the impeller,
the bellmouth including a plurality of grooves located at a surface of the bellmouth, the surface of the bellmouth being connected to an inner surface of the rising part, the inner surface of the rising part facing the blade part of the impeller,
the plurality of grooves extending along an entirety of the corner portion and extending along a portion of each of the flat part and the rising part, the portion of the flat part and the rising part being located immediately adjacent the corner portion.