# US 9,039,374 B2 · Turbine rotor

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- Number: US 9,039,374 B2
- Document ID: US9039374B2
- Status: Granted
- Kind: B2
- Application number: 13/376,554
- Filed: 2010-02-16
- Published: 2012-04-05
- Granted: 2015-05-26
- Earliest claimed: 2009-06-26
- Assignees: Mitsubishi Heavy Industries, Ltd.
- Applicants: Katsuyuki Osako; Atsushi Matsuo; Takao Yokoyama
- Inventors: Katsuyuki Osako; Atsushi Matsuo; Takao Yokoyama
- Web page: https://patentgrep.com/patent/US9039374B2

## CPC

- F01D 5/141: {Shape, i.e. outer, aerodynamic form (F01D5/148 - F01D5/20 take precedence; blade construction F01D5/147)}
- F01D 5/02: Blade-carrying members, e.g. rotors (rotors of non-bladed type F01D1/34; stators F01D9/00 {; selecting particular materials F01D5/28})
- F01D 5/043: {of the axial inlet- radial outlet, or vice versa, type}
- F01D 5/048: {Form or construction}
- F01D 25/24: 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})
- F01D 5/20: Specially-shaped blade tips to seal space between tips and stator {(F01D5/225 takes precedence)}
- F05D 2240/30: Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05D 2250/71: curved
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## 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.

## Claims

### Claim 1

A turbine rotor of a turbine, a working 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 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, and 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, wherein
a blade angle of the third shroud line decreases toward the outlet.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 2)

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.

### Claim 4

A turbine rotor of a turbine, a working 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 the turbine blade is a shroud line, and
the shroud line includes a first shroud line that makes a large change from the inlet toward the outlet in a blade angle with respect to the axis of rotation, and a second shroud line that extends from the outlet side of the first shroud line to the outlet and makes a smaller change than that of the first shroud line, wherein
the first shroud line has a length of 10% to 20% of the shroud line, and the second shroud line has a length of 80% to 90% of the shroud line, the length of the second shroud line being equal to a length obtained by subtracting the length of the first shroud line from the length of the shroud line.

### Claim 5 (depends on 4)

The turbine rotor according to claim 4, wherein the second shroud line has a blade turning angle, which is an amount of change in the blade angle, of 30° or less.

### Claim 6 (depends on 4)

The turbine rotor according to claim 4, wherein
the shroud line includes the first shroud line including an entrance-side shroud line which is a shroud line on the inlet side, and the second shroud line including a center shroud line and an exit-side shroud line that extend from an outlet side of the entrance-side shroud line to the outlet, and
in a meridional cross section that is a cross section including the axis of rotation of the hub, the entrance-side shroud line has a curvature smaller than those of the center and exit-side shroud lines.

### Claim 7 (depends on 6)

The turbine rotor according to claim 6, wherein the entrance-side shroud line is formed in a curved shape, and the center and exit-side shroud lines are formed in a straight shape.