Turbine

Patent metadata

Field	Value
Publication number	US-10378369-B2
Application number	US-201515107657-A
Country	US
Kind code	B2
Filing date	Jan 5, 2015
Priority date	Dec 27, 2013
Publication date	Aug 13, 2019
Grant date	Aug 13, 2019

Abstract

A turbine is provided with a turbine rotor blade, and a turbine housing having a scroll part extending along a circumferential direction of the turbine rotor blade. The scroll part is configured such that an A/R ratio of a flow passage area A to a distance R between an axis of the turbine rotor blade and a flow passage center of the scroll part has a concave distribution at least in a part of a graph where an abscissa represents a circumferential position around the axis of the turbine rotor blade and an ordinate represents the A/R ratio.

First claim

The invention claimed is:

1. A turbine comprising:
a turbine rotor blade; and
a turbine casing having,
an introducing part, and
a scroll part extending along a circumferential direction of the turbine rotor blade, an outer peripheral wall of the scroll part extending continuously from an outer peripheral wall of the introducing part,

wherein the outer peripheral wall of the scroll part has a tongue part in contact with a virtual circle around an axis of the turbine rotor blade, and
wherein when a flow passage of an exhaust gas is defined by the outer peripheral wall of the scroll part and the virtual circle, an A/R ratio of a flow passage area A to a distance R between an axis of the turbine rotor blade and a flow passage center of the scroll part has a concave distribution at least in a part of a graph where an abscissa represents a circumferential position around the axis of the turbine rotor blade and an ordinate represents the A/R ratio.

2. The turbine according to claim 1 ,
wherein, provided that the circumferential position is 0° at an inlet of the scroll part and a positional value of the circumferential position increases from the inlet toward an end of the scroll part, the scroll part is configured such that a rate of change of the A/R while the circumferential position changes from 0° to 90° is at least 1.2 times higher than a case where the A/R linearly decreases.

3. The turbine according to claim 2 ,
wherein the scroll part is configured such that the rate of change of the A/R while the circumferential position changes from 0° to 90° is at least 1.4 times higher than the case where the A/R linearly decreases.

4. The turbine according to claim 1 ,
wherein the scroll part is configured such that the rate of change of the A/R while the circumferential position changes from 0° to 90° is up to three times higher than a case where the A/R linearly decreases.

Assignees

• Mitsubishi Heavy Ind Ltd
• Imp Innovations Ltd

Inventors

• Yokoyama Takao
• Ibaraki Seiichi
• Martinez-Botas Ricardo
• Yang Mingyang

Classifications

• F01D9/026 Primary

  Scrolls for radial machines or engines · CPC title

• F01D25/24

  Casings (modified for heating or cooling F01D25/14); Casing parts, e.g. diaphragms, casing fastenings (casings for rotary machines or engines in general F16M {; special arrangements in stators dealing with breaking-off of part of rotor F01D21/045}) · CPC title

• F05D2220/40

  in turbochargers · CPC title

• F01D5/043

  of the axial inlet- radial outlet, or vice versa, type · CPC title

• F05D2240/24

  for turbines · CPC title