Turbine rotor

Patent metadata

Field	Value
Publication number	US-9353630-B2
Application number	US-201514692451-A
Country	US
Kind code	B2
Filing date	Apr 21, 2015
Priority date	Jun 26, 2009
Publication date	May 31, 2016
Grant date	May 31, 2016

Abstract

A turbine rotor of a turbine includes a hub that serves as an axis of rotation, and a plurality of turbine blades. The turbine blades each have a line extending along a shroud-side edge of the turbine blade from the inlet to the outlet as a shroud line. The shroud line includes an entrance-side shroud line La that makes a small change from the inlet toward the outlet in a blade angle with respect to the axis of rotation, a center shroud line Lb that extends from the outlet side of the entrance-side shroud line La and makes a greater change than that of the entrance-side shroud line La, and an exit-side shroud line Lc that extends from the outlet side of the center shroud line Lb to the outlet and makes a smaller change than that of the center shroud line Lb.

First claim

The invention claimed is:

1. A turbine rotor of a turbine, a work fluid which flows into the turbine rotor in a radial direction through an inlet passing the turbine rotor and flowing out from an outlet, the turbine rotor comprising:
a hub that is rotatable about an axis of rotation; and
a plurality of turbine blades that are arranged on a peripheral surface of the hub, and receive and direct the inflowing working fluid from the inlet toward the outlet, wherein
the turbine blades each are connected to the hub at a bottom side, or hub side, and have a free end on a tip side, or shroud side,
a line extending from the inlet to the outlet along a shroud-side edge of each turbine blade is a shroud line, and
the shroud line includes;
a first shroud line that makes a small change from the inlet to a turning position toward the outlet in a blade angle with respect to the axis of rotation,
a second shroud line that extends from the outlet side of the first shroud line and makes a greater change than that of the first shroud line from the turning position to a predetermined position,
a third shroud line that extends from the outlet side of the second shroud line to the outlet and makes a smaller change than that of the second shroud line,
the blade angle of the first shroud line decreases from the inlet to the turning position,
a blade angle of the second shroud line increases from the turning position to the predetermined position, and
a flow channel of the work fluid extending from the inlet to the outlet makes a turn in flowing direction from the radial direction to an axial direction via the turning position.

2. The turbine rotor according to claim 1 , wherein an inlet line which is a line along an inlet-side edge of each of the turbine blades tilts in a direction of rotation with respect to the axis of rotation.

3. The turbine rotor according to claim 2 , wherein the inlet line has a tilt angle of 10° to 25° with respect to the axis of rotation.

Assignees

• Mitsubishi Heavy Ind Ltd
• Mitsubishi Heavy Ind Ltd

Inventors

• Osako Katsuyuki
• Matsuo Atsushi
• Yokoyama Takao

Classifications

• 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

• F01D5/20

  Specially-shaped blade tips to seal space between tips and stator {(F01D5/225 takes precedence)} · CPC title

• F05D2250/71

  curved · CPC title

• F01D5/02

  Blade-carrying members, e.g. rotors (rotors of non-bladed type F01D1/34; stators F01D9/00 {; selecting particular materials F01D5/28}) · CPC title

• F01D5/141 Primary

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