US 12,313,079 B2
Impeller of centrifugal compressor and centrifugal compressor
Tadashi Kanzaka, Tokyo (JP); Kenichiro Iwakiri, Tokyo (JP); Yutaka Fujita, Tokyo (JP); and Hironori Honda, Tokyo (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD., Sagamihara (JP)
Appl. No. 18/289,405
Filed by MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD., Sagamihara (JP)
PCT Filed Jun. 10, 2021, PCT No. PCT/JP2021/022206
§ 371(c)(1), (2) Date Nov. 3, 2023,
PCT Pub. No. WO2022/259490, PCT Pub. Date Dec. 15, 2022.
Prior Publication US 2024/0240647 A1, Jul. 18, 2024
Int. Cl. F04D 29/22 (2006.01); B23C 3/18 (2006.01); F04D 29/28 (2006.01); F04D 29/30 (2006.01); F04D 29/32 (2006.01); F04D 29/42 (2006.01)
CPC F04D 29/30 (2013.01) [F04D 29/284 (2013.01); F04D 29/324 (2013.01); F04D 29/4226 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An impeller of a centrifugal compressor, the impeller surrounded by a shroud wall portion of a casing in a circumferential direction of the impeller, comprising:
a hub; and
a plurality of blades provided at intervals in the circumferential direction of the impeller on an outer peripheral surface of the hub,
wherein each of the plurality of blades connects a leading edge of the blade and a trailing edge of the blade, and includes a tip end facing the shroud wall portion,
wherein a gap is formed between the shroud wall and the tip end of the blade in which a part of a fluid compressed by the impeller is capable of flowing through
wherein, in a meridian plane shape of the blade, when an X-axis connecting the tip end and a base end of the trailing edge and a Y-axis orthogonal to the X-axis are defined as coordinate axes with the tip end of the trailing edge as an origin, a direction from the tip end toward the base end along the X-axis is defined as a positive direction of the X-axis, and a direction toward an outside in a radial direction of the impeller along the Y-axis is defined as a positive direction of the Y-axis,
the trailing edge in the meridian plane shape of the blade includes a first decrease section that extends such that a Y-coordinate decreases as an X-coordinate increases, and
a first increase section that is located between the first decrease section and the base end and that extends such that a Y-coordinate increases as an X-coordinate increases.