US 11,835,057 B2
Impeller of centrifugal compressor, centrifugal compressor, and turbocharger
Yutaka Fujita, Tokyo (JP); and Nobuhito Oka, Kanagawa (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD., Sagamihara (JP)
Appl. No. 17/782,321
Filed by MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD., Sagamihara (JP)
PCT Filed Dec. 9, 2019, PCT No. PCT/JP2019/047999
§ 371(c)(1), (2) Date Jun. 3, 2022,
PCT Pub. No. WO2021/117077, PCT Pub. Date Jun. 17, 2021.
Prior Publication US 2022/0389936 A1, Dec. 8, 2022
Int. Cl. F04D 29/28 (2006.01); F04D 17/10 (2006.01); F04D 29/30 (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)] 7 Claims
OG exemplary drawing
 
1. An impeller of a centrifugal compressor, comprising:
a hub;
at least one airfoil portion erected on a hub surface of the hub, the at least one airfoil portion having a trailing edge configured such that a distance between the trailing edge and an axis of the centrifugal compressor increases with increasing distance from a back surface of the hub; and
a first fillet which is formed on a radially outer side of an outer peripheral surface of a back plate portion forming a back surface portion of the hub, the first fillet connecting the outer peripheral surface and the trailing edge of the at least one airfoil portion,
wherein the first fillet has a curved portion having a center of curvature exists on a radially outer side of the outer peripheral surface, in a meridional cross-section of the impeller, and
wherein an end edge of the curved portion on a side of the outer peripheral surface is located at the back plate portion.