US 11,988,227 B2
Compressor housing and centrifugal compressor
Kenichiro Iwakiri, Tokyo (JP); Tadashi Kanzaka, Tokyo (JP); and Yutaka Fujita, Tokyo (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD., Sagamihara (JP)
Appl. No. 18/018,213
Filed by MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD., Sagamihara (JP)
PCT Filed Sep. 7, 2020, PCT No. PCT/JP2020/033826
§ 371(c)(1), (2) Date Jan. 26, 2023,
PCT Pub. No. WO2022/049779, PCT Pub. Date Mar. 10, 2022.
Prior Publication US 2023/0304507 A1, Sep. 28, 2023
Int. Cl. F04D 29/42 (2006.01); F04D 29/68 (2006.01)
CPC F04D 29/4213 (2013.01) [F04D 29/685 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A compressor housing for rotatably housing an impeller of a centrifugal compressor, comprising:
when an intake side in an axial direction of the centrifugal compressor is defined as a front side, and a side opposite to the intake side in the axial direction is defined as a rear side,
a shroud surface including a surface facing a tip of an impeller blade of the impeller with a predetermined gap;
a front-side inner peripheral surface formed on the front side of the shroud surface in the axial direction and positioned on an outer side in a radial direction than a front end of the shroud surface; and
a plurality of protrusions protruding toward an inner side in the radial direction from the front-side inner peripheral surface and formed between adjacent grooves among a plurality of grooves formed in the front-side inner peripheral surface at intervals in a circumferential direction, wherein
each of the plurality of grooves includes:
an inclined portion whose depth gradually increases toward a rotation direction of the impeller; and
a stepped portion formed at a downstream end of the inclined portion in the rotation direction, the stepped portion being a wall extending along the radial direction.