Rotating machine

Patent metadata

Field	Value
Publication number	US-11655723-B2
Application number	US-201917423178-A
Country	US
Kind code	B2
Filing date	Nov 13, 2019
Priority date	Jan 31, 2019
Publication date	May 23, 2023
Grant date	May 23, 2023

Abstract

A rotating machine includes a casing having a hollow shape; a rotator rotatably supported in the casing; a stator blade fixed to an inner peripheral portion of the casing; a rotor blade fixed to an outer peripheral portion of the rotator while being displaced from the stator blade in an axial direction of the rotator; a sealing device disposed between the inner peripheral portion of the casing and a tip of the rotor blade; a swirling flow generation chamber provided along a circumferential direction of the rotator on a downstream side of the sealing device in the casing in a fluid flow direction; and guiding members provided at predetermined intervals in the swirling flow generation chamber in the circumferential direction of the rotator. The guiding members each include a first guiding surface that is inclined in the circumferential direction with respect to the axial direction of the rotator.

First claim

The invention claimed is:

1. A rotating machine comprising:
a casing having a hollow shape;
a rotator rotatably supported in the casing;
a stator blade fixed to an inner peripheral portion of the casing;
a rotor blade fixed to an outer peripheral portion of the rotator while being displaced from the stator blade in an axial direction of the rotator;
a sealing device disposed between the inner peripheral portion of the casing and a tip of the rotor blade;
a swirling flow generation chamber provided along a circumferential direction of the rotator on a downstream side of the sealing device in the casing in a fluid flow direction; and
a plurality of guiding members provided at predetermined intervals in the swirling flow generation chamber in the circumferential direction of the rotator, wherein
the guiding members each include a first guiding surface that is inclined in the circumferential direction with respect to the axial direction of the rotator.

2. The rotating machine according to claim 1 , wherein the first guiding surface is provided along a swirling direction of fluid leaking from the sealing device.

3. The rotating machine according to claim 1 , wherein an end portion of the first guiding surface on the downstream side in the fluid flow direction is inclined to a downstream side in a rotational direction of the rotator with respect to the axial direction of the rotator.

4. The rotating machine according to claim 1 , wherein the guiding members each include an extension portion extending from the swirling flow generation chamber to an upstream side in the fluid flow direction, and the first guiding surface is formed on a surface of the extension portion on a downstream side in a rotational direction of the rotator.

5. The rotating machine according to claim 4 , wherein the first guiding surface includes a base end surface extending from the casing side to the upstream side in the fluid flow direction, and a front end surface curved from the base end surface to the upstream side in the fluid flow direction and an upstream side in the rotational direction of the rotator.

6. The rotating machine according to claim 4 , wherein the first guiding surface includes a base end surface extending from the casing side to the upstream side in the fluid flow direction and the downstream side in the rotational direction of the rotator, and a front end surface curved from the base end surface to the upstream side in the fluid flow direction and an upstream side in the rotational direction of the rotator.

7. The rotating machine according to claim 4 , wherein an end portion of the extension portion on the upstream side in the fluid flow direction has a curved shape.

8. The rotating machine according to claim 1 , wherein the sealing device includes a seal fin extending from one of the inner peripheral portion of the casing and the tip of the rotor blade to the other and forming a gap, an inclination angle between the first guiding surface and the axial direction of the rotator is largest at a position facing the gap on the downstream side in the fluid flow direction, and the inclination angle becomes smaller to an outside and an inside in a radial direction of the rotator.

9. The rotating machine according to claim 8 , wherein a length of the interval between the guiding members that are adjacent in the circumferential direction of the rotator is smallest at the position facing the gap on the downstream side in the fluid flow direction and becomes larger to the outside and the inside in the radial direction of the rotator.

10. The rotating machine according to claim 8 , wherein a length of the interval between the guiding members that are adjacent in the circumferential direction of the rotator is largest at the position facing the gap on the downstream side in the fluid flow direction and becomes smaller to the outside and the inside in the radial direction of the rotator.

11. The rotating machine according to claim 1 , wherein the guiding members each include a second guiding surface on a surface on an upstream side in a rotational direction of the rotator, and an end portion of the second guiding surface on the downstream side in the fluid flow direction is inclined to a downstream side in the rotational direction of the rotator with respect to the axial direction of the rotator.

12. The rotating machine according to claim 1 , wherein the guiding members each include a second guiding surface on a surface on an upstream side in a rotational direction of the rotator, and an end portion of the second guiding surface on the downstream side in the fluid flow direction is inclined to the upstream side in the rotational direction of the rotator with respect to the axial direction of the rotator.

13. The rotating machine according to claim 1 , wherein the swirling flow generation chamber includes an inner circumferential surface of the casing, a first wall surface facing the sealing device in the casing on the downstream side in the fluid flow direction, and a second wall surface facing the inner circumferential surface of the casing on an inside in the radial direction of the rotator, and the guiding members are fixed to the inner circumferential surface of the casing, the first wall surface, and the second wall surface.

Assignees

• Mitsubishi Power Ltd
• Mitsubishi Heavy Ind Ltd

Inventors

• Kuwamura Yoshihiro
• Duan Chongfei
• Sugishita Hideaki
• Matsumoto Kazuyuki
• Ono Hideki
• Segawa Kiyoshi
• Fukushima Hisataka

Classifications

• F02C7/28

  Arrangement of seals · CPC title

• F05D2240/55

  Seals · CPC title

• F16J15/447

  Labyrinth packings · CPC title

• F05D2250/11

  triangular · CPC title

• F05D2220/31

  in steam turbines · CPC title