US 11,835,058 B2
Impeller and centrifugal compressor
Hironori Honda, Tokyo (JP); Nao Taniguchi, Tokyo (JP); Fumito Hiratani, Tokyo (JP); Isao Tomita, Tokyo (JP); Tetsuya Matsuo, Nagasaki (JP); and Taiyo Shirakawa, Nagasaki (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES MARINE MACHINERY & EQUIPMENT CO., LTD., Nagasaki (JP)
Appl. No. 17/914,467
Filed by Mitsubishi Heavy Industries Marine Machinery & Equipment Co., Ltd., Nagasaki (JP)
PCT Filed Apr. 21, 2021, PCT No. PCT/JP2021/016172
§ 371(c)(1), (2) Date Sep. 26, 2022,
PCT Pub. No. WO2021/215471, PCT Pub. Date Oct. 28, 2021.
Claims priority of application No. 2020-076704 (JP), filed on Apr. 23, 2020.
Prior Publication US 2023/0123100 A1, Apr. 20, 2023
Int. Cl. F04D 29/30 (2006.01); F04D 29/28 (2006.01); F04D 17/10 (2006.01); F01D 5/14 (2006.01); F01D 5/04 (2006.01)
CPC F04D 29/284 (2013.01) [F04D 17/10 (2013.01); F04D 29/30 (2013.01); F01D 5/048 (2013.01); F01D 5/141 (2013.01); F05D 2240/303 (2013.01); F05D 2240/304 (2013.01); F05D 2250/70 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An impeller, comprising:
a disk-shaped hub centered on an axis; and
a plurality of blades arranged in a circumferential direction and protruding from a surface of the hub facing one side in a direction of the axis,
wherein, in a cross-sectional view including a blade height direction which is a direction away from the hub toward a tip of each blade, the blade has a recessed surface curved convexly toward a rear side in a rotational direction,
wherein, in the cross-sectional view, when a distance between an imaginary line connecting a tip-side edge and a hub-side edge of the blade and a midspan of the blade along a direction perpendicular to the imaginary line is defined as a recess amount,
the blade has a portion where the recess amount increases from a leading edge side to a trailing edge side, and
wherein, in a position of the trailing edge of the blade, a blade angle at the midspan is smaller than a blade angle on the hub side and a blade angle on the tip side.