US 11,808,271 B2
Axial fan
Yoshihisa Yamazaki, Tokyo (JP)
Assigned to SANYO DENKI CO., LTD., Tokyo (JP)
Filed by SANYO DENKI CO., LTD., Tokyo (JP)
Filed on Aug. 2, 2022, as Appl. No. 17/879,491.
Claims priority of application No. 2021-146167 (JP), filed on Sep. 8, 2021.
Prior Publication US 2023/0072211 A1, Mar. 9, 2023
Int. Cl. F04D 19/00 (2006.01); F04D 29/52 (2006.01)
CPC F04D 19/002 (2013.01) [F04D 29/522 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An axial fan comprising:
a rotor blade configured to rotate about a rotation axis along an air-blowing direction;
a round tubular base portion placed on the rotation axis and on a downstream side in the air-blowing direction of the rotor blade; and
an outer frame portion where the rotor blade and the base portion are housed,
wherein the base portion includes an inclined portion in an end portion, on the downstream side in the air-blowing direction, of the base portion, the inclined portion reducing in diameter toward the downstream side in the air-blowing direction,
the inclined portion includes opening portions and hollow ribs,
the opening portions are placed at predetermined intervals in a peripheral direction of the inclined portion, and
each of the hollow ribs surrounds a peripheral part on an outer side of each of the opening portions in a radial direction of the inclined portion, and sticks out from the inclined portion toward the downstream side in the air-blowing direction along the rotation axis.