Turbine wheel, turbine, and turbocharger

Patent metadata

Field	Value
Publication number	US-11215057-B2
Application number	US-201716342357-A
Country	US
Kind code	B2
Filing date	Jan 16, 2017
Priority date	Jan 16, 2017
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

There is provided a turbine wheel includes a plurality of long blades and a plurality of short blades. A trailing edge of each short blade is positioned upstream of a trailing edge of each long blade in an axial direction of the turbine wheel, and at least one of a leading edge of each long blade or a leading edge of each short blade includes an inclined part which is inclined so that a distance to a rotational axis of the turbine wheel decreases toward a hub.

First claim

The invention claimed is:

1. A turbine wheel comprising a plurality of long blades and a plurality of short blades,
wherein a trailing edge of each short blade is positioned upstream of a trailing edge of each long blade in an axial direction of the turbine wheel, and
wherein at least one of a leading edge of each long blade or a leading edge of each short blade includes an inclined part which is inclined so that a distance to a rotational axis of the turbine wheel decreases toward a hub,
wherein the inclined part includes a first inclined part formed on the leading edge of each long blade, the first inclined part being inclined so that the distance to the rotational axis of the turbine wheel decreases toward the hub, and
wherein at least a part of the leading edge of each short blade is positioned on an outer side of the first inclined part in a radial direction of the turbine wheel.

2. The turbine wheel according to claim 1 ,
wherein the leading edge of each long blade and the leading edge of each short blade each include the inclined part which is inclined so that the distance to the rotational axis of the turbine wheel decreases toward the hub.

3. The turbine wheel according to claim 1 ,
wherein, when X 1 is an intersection between the leading edge of each short blade and a middle span line formed by a set of middle positions in a span direction of the short blade, R 1 is a distance between the intersection X 1 and the rotational axis of the turbine wheel, R 0 is an outer diameter of the turbine wheel, and D is a distance between the leading edge of the short blade and the trailing edge of the short blade along the middle span line, the following expression (A) is satisfied:
( R 0− R 1+ D )/( R 0− R 1)>12.5  (A).

4. The turbine wheel according to claim 1 ,
wherein the leading edge of each short blade extends along the axial direction.

5. A turbine wheel comprising a plurality of long blades and a plurality of short blades,
wherein a trailing edge of each short blade is positioned upstream of a trailing edge of each long blade in an axial direction of the turbine wheel, and
wherein at least one of a leading edge of each long blade or a leading edge of each short blade includes an inclined part which is inclined so that a distance to a rotational axis of the turbine wheel decreases toward a hub,
wherein the inclined part includes a second inclined part formed on the leading edge of each short blade, the second inclined part being inclined so that the distance to the rotational axis of the turbine wheel decreases upstream in the axial direction, and
wherein at least a part of the second inclined part is positioned on an outer side of the leading edge of each long blade in a radial direction of the turbine wheel.

6. The turbine wheel according to claim 5 ,
wherein the leading edge of each long blade extends along the axial direction.

7. A turbine comp sing a turbine wheel according to claim 1 .

8. A turbocharger comprising a turbine according to claim 7 .

9. The turbine wheel according to claim 5 , wherein the leading edge of each long blade and the leading edge of each short blade each include the inclined part which is inclined so that the distance to the rotational axis of the turbine wheel decreases toward the hub.

10. The turbine wheel according to claim 5 , wherein, when X 1 is an intersection between the leading edge of each short blade and a middle span line formed by a set of middle positions in a span direction of the short blade, R 1 is a distance between the intersection X 1 and the rotational axis of the turbine wheel, R 0 is an outer diameter of the turbine wheel, and D is a distance between the leading edge of the short blade and the trailing edge of the short blade along the middle span line, the following expression (A) is satisfied:
( R 0− R 1+ D )/( R 0− R 1)>12.5  (A).

11. A turbine comprising a turbine wheel according to claim 5 .

12. A turbocharger comprising a turbine according to claim 11 .

Assignees

• Mitsubishi Heavy Ind Engine & Turbocharger Ltd

Inventors

• Yoshida Toyotaka
• Danmoto Yosuke
• Akiyama Yoji

Classifications

• F05D2220/30

  in turbines · CPC title

• F05D2220/40

  in turbochargers · CPC title

• F01D5/048 Primary

  Form or construction · CPC title

• F02B39/00

  Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00 · CPC title

• F01D5/141 Primary

  Shape, i.e. outer, aerodynamic form (F01D5/148 - F01D5/20 take precedence; blade construction F01D5/147) · CPC title