Turbomachine sealing ring

Patent metadata

Field	Value
Publication number	US-11125101-B2
Application number	US-201816018441-A
Country	US
Kind code	B2
Filing date	Jun 26, 2018
Priority date	Jul 4, 2017
Publication date	Sep 21, 2021
Grant date	Sep 21, 2021

Abstract

A sealing ring for a turbomachine, in particular a compressor or turbine stage of a gas turbine is provided, the sealing ring having an, in particular at least partially honeycomb-like and/or integral, seal, in particular an abradable coating (13); a profile cross section of the sealing ring, which is in particular at least partially manufactured by a generative manufacturing process, varying in the circumferential direction, in particular at least in some regions continuously and/or non-continuously at one or more circumferential positions, in particular separation points.

First claim

What is claimed is:

1. A sealing ring for a turbomachine, the sealing ring comprising:
a plurality of ring segments, wherein each ring segment extends circumferentially and has a first axial edge and a second axial edge, wherein each ring segment includes:
a continuous radial flange extending circumferentially along said ring segment from one circumferential end face to the other circumferential end face of the ring segment;
an axial rib between said first axial edge and said second axial edge projecting axially from the radial flange in a direction away from the first axial edge and towards the second axial edge, the axial rib having a radial height that continuously varies in the circumferential direction;
a seal on an inwardly facing side of each ring segment.

2. The sealing ring as recited in claim 1 wherein the axial rib has an axial dimension that varies in the circumferential direction.

3. The sealing ring as recited in claim 2 wherein, on each ring segment, a pair of radial ribs are disposed on a circumferential surface in a circumferential groove located between the first and second axial edges, the radial ribs projecting radially from the circumferential surface and extending circumferentially along said ring segment.

4. The sealing ring as recited in claim 3 wherein the circumferential groove includes an undercut.

5. The sealing ring as recited in claim 3 , wherein each radial rib has a axial width that varies in the circumferential direction.

6. The sealing ring as recited in claim 1 further comprising circumferentially spaced-apart supports disposed on a circumferential surface and adapted to radially retain bushings of a carrier of the sealing ring.

7. The sealing ring as recited in claim 6 wherein the circumferential surface is in a circumferential groove for attachment of the sealing ring.

8. The sealing ring as recited in claim 7 wherein the circumferential groove includes an undercut.

9. The sealing ring as recited claim 7 wherein, on each ring segment, a pair of radial ribs are disposed on a circumferential surface in the circumferential groove, each radial rib projecting radially from the circumferential surface and extending circumferentially along said ring segment, and wherein the radial rib has the supports.

10. The sealing ring as recited in claim 1 wherein the ring segments are arranged in succession in the circumferential direction.

11. The sealing ring as recited in claim 10 wherein at least one of the ring segments has at least two sub-segments arranged in succession in the circumferential direction and joined by material-to-material bonding or at least two facing end faces of circumferentially successive ring segments have different profiles.

12. The sealing ring as recited in claim 1 , wherein axial rib end faces of the axial rib of each ring segment have dissimilar dimensions or configurations.

13. The sealing ring as recited in claim 11 wherein at least one of the circumferential end faces of at least one of the sub-segments has at least one projection in the circumferential direction, the projection engaging into a cutback of an end face of an adjacent one of the sub-segments.

14. The sealing ring as recited in claim 1 wherein the seal is a partial honeycomb or integral seal.

15. The sealing ring as recited in claim 14 wherein the seal is an abradable coating.

16. The sealing ring as recited in claim 1 wherein the sealing ring is at least partially manufactured by a generative manufacturing process.

17. The sealing ring as recited in claim 1 wherein the sealing ring varies in the circumferential direction at separation points defined by end faces of the ring segments.

18. An assembly for a turbomachine, the assembly comprising a stator ring and stator vanes arranged on the stator ring; and to which at least one sealing ring as recited in claim 1 is detachably, interlockingly or frictionally attached.

19. The assembly as recited in claim 18 wherein the stator vanes are arranged adjustably on the stator ring.

20. The assembly as recited in claim 18 wherein the sealing ring is attached on an opposite side.

21. The assembly as recited in claim 18 wherein the stator ring has at least two stator ring segments arranged in succession in the circumferential direction, and wherein, in the circumferential direction, at least one of the circumferential end faces of a stator ring segment and one of the circumferential end faces of an adjacent ring segment of the segmented sealing ring overlap one another partially.

22. The assembly as recited in claim 21 wherein the overlapping is axially or radially to lock against twisting.

23. A compressor or turbine stage for a gas turbine comprising the assembly as recited in claim 18 .

24. A gas turbine comprising at least one compressor or turbine stage as recited in claim 23 .

25. An aircraft engine comprising the gas turbine as recited in claim 24 .

26. A method for manufacturing the sealing ring as recited in claim 1 comprising at least partially manufacturing the sealing ring by a generative manufacturing process.

27. The method as recited in claim 26 wherein the generative manufacturing process includes selective laser deposition.

Assignees

• MTU Aero Engines AG

Inventors

• Scherer Christian
• Eibelshaeuser Peter
• Schlothauer Steffen
• Jakimov Andreas
• Kraus Juergen

Classifications

• F01D9/04 Primary

  forming ring or sector · CPC title

• F01D11/001

  for sealing space between stator blade and rotor · CPC title

• B28B1/001

  Rapid manufacturing of 3D objects by additive depositing, agglomerating or laminating of material (selective deposition modelling of metallic powder B22F10/00; rapid manufacturing of 3D objects in general and in particular of plastics B29C64/00) · CPC title

• F01D11/127

  with a deformable or crushable structure, e.g. honeycomb · CPC title

• F01D25/246

  Fastening of diaphragms or stator-rings · CPC title