US 11,920,609 B2
Axial fan and refrigeration cycle apparatus
Hideaki Konishi, Osaka (JP); and Naomi Abe, Osaka (JP)
Assigned to Daikin Industries, Ltd., Osaka (JP)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed on Feb. 7, 2022, as Appl. No. 17/666,029.
Application 17/666,029 is a continuation of application No. PCT/JP2020/030423, filed on Aug. 7, 2020.
Claims priority of application No. 2019-147463 (JP), filed on Aug. 9, 2019.
Prior Publication US 2022/0163049 A1, May 26, 2022
Int. Cl. F04D 29/38 (2006.01); F04D 29/66 (2006.01)
CPC F04D 29/384 (2013.01) [F04D 29/38 (2013.01); F04D 29/666 (2013.01); F05D 2240/304 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An axial fan rotating around a rotating shaft, the axial fan comprising:
a hub; and
a plurality of blades extending in a radial direction from the huh, each of the blades including
a leading edge located forward of a rotation direction,
a trailing edge located rearward, the trailing edge including a depression depressed forward in the rotation direction, and
a reinforcing protrusion located at least forwardmost in the rotation direction of the depression and having a wall thickness thicker than a surrounding portion,
as viewed along a rotating shaft direction, when a first virtual line and a second virtual line perpendicular to the radial direction are drawn, the reinforcing protrusion extends radially inside of the first virtual line and extends radially outside of the second virtual line, the first virtual line and the second virtual line respectively passing through
a rearmost first endpoint in the rotation direction on a radially, inside of a rear end that substantially overlaps the depression, and
a rearmost second endpoint on a radially outside of the rear end.