Rotating machine

Patent metadata

Field	Value
Publication number	US-11519287-B2
Application number	US-201917422805-A
Country	US
Kind code	B2
Filing date	Nov 13, 2019
Priority date	Jan 31, 2019
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

A rotating machine includes a hollow casing; a rotating body 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 rotating body to be offset to the stator blade in an axial direction of the rotating body; a sealing device arranged between the inner peripheral portion and a tip of the rotor blade; a swirling flow generation chamber provided in the casing on a downstream side in a fluid flow direction from the sealing device along a circumferential direction of the rotating body; first guiding members provided in the swirling flow generation chamber along a radial direction and in a circumferential direction of the rotating body at predetermined intervals; and a second guiding member provided in the chamber along the circumferential direction while intersecting the first guiding members.

First claim

The invention claimed is:

1. A rotating machine comprising:
a casing having a hollow shape;
a rotating, body 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 rotating body to be offset to the stator blade in an axial direction of the rotating body;
a sealing device arranged between the inner peripheral portion of the casing and a tip of the rotor blade;
a swirling flow generation chamber provided in the casing on a downstream side in a fluid flow direction from the sealing device along a circumferential direction of the rotating body;
a plurality of first guiding members provided in the swirling flow generation chamber along a radial direction of the rotating body and in a circumferential direction of the rotating body at predetermined intervals; and
a second guiding member provided in the swirling flow generation chamber along the circumferential direction of the rotating body while intersecting the first guiding members.

2. The rotating machine according to claim 1 , wherein the second guiding member is provided at a position facing the axial direction of the rotating body with respect to a leakage position of a fluid in the sealing device.

3. The rotating machine according to claim 2 , wherein the sealing device has a seal fin that extends from one to another one of the inner peripheral portion of the casing and the tip of the rotor blade and forms a gap, and the second guiding member is provided to face the downstream side in the fluid flow direction with respect to the gap.

4. The rotating machine according to claim 3 , wherein the sealing device has a seal fin that extends from the inner peripheral portion of the casing to the tip of the rotor blade and forms a gap, and a tip of the second guiding member is located outside in the radial direction of the rotating body from the tip of the rotor blade and is located inside in the radial direction of the rotating body from a tip of the seal fin.

5. The rotating machine according to claim 1 , wherein the first guiding members and the second guiding member have a same length in the axial direction of the rotating body.

6. The rotating machine according to claim 1 , wherein a length of the second guiding member in the axial direction of the rotating body is shorter than a length of the first guiding members in the axial direction of the rotating body.

7. 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 downstream side in the fluid flow direction with respect to the sealing device in the casing, and a second wall surface facing inward in the radial direction of the rotating body with respect to the inner circumferential surface of the casing, and the second guiding member extends from the first wall surface to an upstream side in the fluid flow direction.

8. The rotating machine according to claim 7 , wherein a recessed portion is formed in the inner circumferential surface of the casing, a shroud fixed to the tip of the rotor blade is arranged in the recessed portion with a predetermined gap, the swirling flow generation chamber is provided in the recessed portion on the downstream side in the fluid flow direction and includes an inner circumferential surface of the recessed portion, the first wall surface provided in the recessed portion, and the second wall surface provided on a protrusion extending from the inner circumferential surface of the casing to the upstream side in the fluid flow direction, and an inner surface of the protrusion in the radial direction of the rotating body is located outside in the radial direction of the rotating body from an inner surface of the shroud in the radial direction of the rotating body.

9. The rotating machine according to claim 8 , wherein the shroud is provided on the downstream side in the fluid flow direction with a third guiding member facing the protrusion in the axial direction of the rotating body.

10. The rotating machine according to claim 7 , wherein the second guiding member has a tapered shape from the first wall surface to the upstream side in the fluid flow direction.

11. The rotating machine according to claim 7 , wherein a first curved surface is provided at a connection portion between the second guiding member and the first wall surface.

12. The rotating machine according to claim 7 , wherein a second curved surface is provided at a connection portion between the inner circumferential surface of the casing and the first wall surface, and a third curved surface is provided at a connection portion between the first wall surface and the second wall surface.

13. The rotating machine according to claim 1 , wherein the swirling flow generation chamber is divided by the second guiding member into first swirling flow generation chambers located outside in the radial direction of the rotating body and second swirling flow generation chambers located inside in the radial direction of the rotating body, and number of the first guiding members in the second swirling flow generation chambers is larger than number of the first guiding members in the first swirling flow generation chambers.

Assignees

• Mitsubishi Power Ltd
• Mitsubishi Heavy Ind Ltd

Inventors

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

Classifications

• F16J15/4472

  with axial path · CPC title

• F01D11/08 Primary

  for sealing space between rotor blade tips and stator (specially-shaped blade tips therefor F01D5/20) · CPC title

• F05D2240/129

  Cascades, i.e. assemblies of similar profiles acting in parallel · CPC title

• F01D25/14

  Casings modified therefor (double casings F01D25/26) · CPC title

• F01D5/225

  by shrouding · CPC title