Turbine

Patent metadata

Field	Value
Publication number	US-12270302-B2
Application number	US-202118031275-A
Country	US
Kind code	B2
Filing date	Oct 19, 2021
Priority date	Nov 25, 2020
Publication date	Apr 8, 2025
Grant date	Apr 8, 2025

Abstract

A turbine includes: a rotor having a rotor body, and a plurality of rotor blades; a casing covering the rotor; and a plurality of stator blades, wherein the stator blades each include a stator blade body having formed on the surface thereof a suction part that extends in the radial direction and can suction at least a portion of working fluid, a nozzle inner peripheral member provided inward of the stator blade body in the radial direction, and a plurality of seal fins protruding inward in the radial direction from the inner peripheral surface of the nozzle inner peripheral member, and an ejection port for ejecting the working fluid guided from the suction part is formed in the nozzle inner peripheral member and in a portion of seal fins more on the other side than the seal fin most on one side in the axial line direction.

First claim

The invention claimed is:

1. A turbine comprising:
a rotor that includes a rotor main body rotatable around an axis and a plurality of rotor blades arranged in a circumferential direction along an outer peripheral surface of the rotor main body;
a casing that covers the rotor; and
a plurality of stator vanes that are arranged in the circumferential direction along an inner peripheral surface of the casing,
wherein the stator vanes each include
a stator vane main body that extends in a radial direction with respect to the axis and that includes a surface in which a suction portion, through which at least a portion of a working fluid flowing from one side to the other side in a direction along the axis is suckable, is formed,
a nozzle inner peripheral member that is provided inside the stator vane main body in the radial direction, and
a plurality of seal fins that protrude radially inward from an inner peripheral surface of the nozzle inner peripheral member and that are arranged at intervals in the direction along the axis, and

an ejection port through which the working fluid introduced through the suction portion is ejected is formed in the nozzle inner peripheral member and in a portion of the seal fin that is closer to the other side in the direction along the axis than the seal fin closest to the one side in the direction along the axis is,
wherein the suction portion includes a trailing edge side suction port formed at a position on a suction surface of the stator vane main body that is close to a trailing edge side, the trailing edge side suction port extending over an entire region in the radial direction.

2. The turbine according to claim 1 ,
wherein the suction portion is at least partially located on the suction surface.

3. The turbine according to claim 1 ,
wherein the suction portion includes a leading edge side suction port formed at a position on the suction surface of the stator vane main body that is close to a leading edge side, the leading edge side suction port being positioned at least one of a portion on a radial inner side and a portion on a radial outer side.

4. The turbine according to claim 3 ,
wherein the leading edge side suction port extends over an entire region in the radial direction.

5. A turbine comprising:
a rotor that includes a rotor main body rotatable around an axis and a plurality of rotor blades arranged in a circumferential direction along an outer peripheral surface of the rotor main body;
a casing that covers the rotor; and
a plurality of stator vanes that are arranged in the circumferential direction along an inner peripheral surface of the casing,
wherein the stator vanes each include
a stator vane main body that extends in a radial direction with respect to the axis and that includes a surface in which a suction portion, through which at least a portion of a working fluid flowing from one side to the other side in a direction along the axis is suckable, is formed,
a nozzle inner peripheral member that is provided inside the stator vane main body in the radial direction, and
a plurality of seal fins that protrude radially inward from an inner peripheral surface of the nozzle inner peripheral member and that are arranged at intervals in the direction along the axis, and

an ejection port through which the working fluid introduced through the suction portion is ejected is formed in the nozzle inner peripheral member and in a portion of the seal fin that is closer to the other side in the direction along the axis than the seal fin closest to the one side in the direction along the axis is,
wherein the ejection port is formed in a radial inner end portion of one of the plurality of seal fins that is a second or subsequent seal fin counting from the one side in the direction along the axis.

6. A turbine comprising:
a rotor that includes a rotor main body rotatable around an axis and a plurality of rotor blades arranged in a circumferential direction along an outer peripheral surface of the rotor main body;
a casing that covers the rotor; and
a plurality of stator vanes that are arranged in the circumferential direction along an inner peripheral surface of the casing,
wherein the stator vanes each include
a stator vane main body that extends in a radial direction with respect to the axis and that includes a surface in which a suction portion, through which at least a portion of a working fluid flowing from one side to the other side in a direction along the axis is suckable, is formed,
a nozzle inner peripheral member that is provided inside the stator vane main body in the radial direction, and
a plurality of seal fins that protrude radially inward from an inner peripheral surface of the nozzle inner peripheral member and that are arranged at intervals in the direction along the axis, and

an ejection port through which the working fluid introduced through the suction portion is ejected is formed in the nozzle inner peripheral member and in a portion of the seal fin that is closer to the other side in the direction along the axis than the seal fin closest to the one side in the direction along the axis is,
wherein the ejection port is formed in a surface of one of the plurality of seal fins that is a second or subsequent seal fin counting from the one side in the direction along the axis and is configured such that the working fluid is ejected radially inward, the surface facing the other side in the direction along the axis.

7. The turbine according to claim 1 ,
wherein the ejection port is formed in a surface of one of the plurality of seal fins that is a second or subsequent seal fin counting from the one side in the direction along the axis and is configured such that the working fluid is ejected with a direction component toward the other side in the direction along the axis, the surface facing the other side in the direction along the axis.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Nakagawa Atsushi
• Konishi Eiji

Classifications

• F01D9/041

  using blades (F01D5/148 takes precedence) · CPC title

• F01D11/02

  by non-contact sealings, e.g. of labyrinth type (for sealing space between rotor blade tips and stator F01D11/08) · CPC title

• F04D19/00

  Axial-flow pumps (F04D21/00 takes precedence; {pump comprising axial flow and radial flow stages F04D17/025}) · CPC title

• F04D29/68

  by influencing boundary layers {(by bleeding elastic fluid F04D27/0215)} · CPC title

• F01D9/04

  forming ring or sector · CPC title