Low leakage duct segment using expansion joint assembly

Patent metadata

Field	Value
Publication number	US-10451204-B2
Application number	US-201414765849-A
Country	US
Kind code	B2
Filing date	Mar 11, 2014
Priority date	Mar 15, 2013
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

A turbine shroud for incorporation in a turbine of a gas turbine engine has a plurality of butted shroud segments circumferentially arrayed to form a ring. Each of the shroud segments has an arcuate main shroud body portion, a radially inward extending annular flange attached to a first end of the main body portion, and a radially outward extending flange with a plurality of mounting apertures attached to a second end of the main shroud body portion. A first mounting aperture is sized smaller than an adjacent second mounting aperture in the radially outward extending flange.

First claim

The invention claimed is:

1. A turbine shroud for incorporation in a turbine of a gas turbine engine, comprising a plurality of butted shroud segments circumferentially arrayed to form a ring, each of said shroud segments comprising:
an arcuate main shroud body portion;
a radially inward extending annular flange attached to a first end of the main body portion; and
a radially outward extending flange with a plurality of mounting apertures attached to a second end of the main shroud body portion, wherein a first mounting aperture is sized smaller than an adjacent second mounting aperture.

2. The turbine shroud of claim 1 wherein each pair of adjacent shroud segments have opposing abutments with axial and radial seals arranged therebetween.

3. The turbine shroud of claim 1 wherein the radially inward extending flange contains a seal channel.

4. The turbine shroud of claim 1 wherein the radially outward extending flange contains a seal channel.

5. The turbine shroud of claim 1 wherein the first aperture is centrally located in the radially outward flange.

6. The turbine shroud of claim 1 further comprising:
an abradable pad attached to a radially inner side of the main shroud body portion.

7. A low leakage outer air duct mounting arrangement comprising:
a duct shroud segment including a radially outward extending flange with a plurality of shroud segment apertures therein;
an engine case positioned radially outward of the duct shroud segment including a plurality of case apertures that align with the corresponding plurality of shroud segment apertures;
a plurality of collars that extend at least partially through both the case apertures and corresponding shroud segment apertures; and
a plurality of fasteners that extend through the collars to secure the duct shroud segment with respect to the engine case.

8. The mounting arrangement of claim 7 wherein each of the plurality of collars includes a stem that extends at least partially through both one of the case apertures and the corresponding one of the shroud segment apertures, and wherein at least two of the shroud segment apertures are nominally larger than spacers to accommodate radial expansion of the duct shroud segment.

9. The mounting arrangement of claim 8 wherein the plurality of collars contain a flange that prevents airflow in the axial direction through the nominally larger shroud segment apertures.

10. The mounting arrangement of claim 8 wherein the duct shroud segment contains three shroud segment apertures.

11. The mounting arrangement of claim 10 wherein at least one aperture is centrally located within the radially outward extending flange, and wherein the at least one aperture radially locates the duct shroud segment with respect to the engine case.

12. The mounting arrangement of claim 7 wherein the radially outward extending flange contains a seal channel.

13. The mounting arrangement of claim 7 wherein the duct shroud segment includes a radially inward extending flange that contains a seal channel.

14. The mounting arrangement of claim 13 wherein the radially inward extending flange contains an axial extension.

15. The mounting arrangement of claim 14 where in the engine case contains a channel for reception of the axial extension.

16. The mounting arrangement of claim 7 wherein the duct shroud segment includes an abradable pad attached to a radially inner side thereof.

17. A turbine shroud assembly comprising:
a shroud segment including:
an arcuate blade covering surface;
a radially inward extending annular flange attached to a first end of the arcuate blade covering surface; and
a radially outward extending flange, attached to a second end of the arcuate blade covering surface, that includes a plurality of apertures, wherein at least one of the plurality of apertures is sized smaller than an adjacent aperture; and

a plurality of flanged collars capable of being inserted into the plurality of apertures of the shroud segment;
wherein the smaller sized aperture locates the shroud segment both in an axial direction and in a radial direction; and
wherein the adjacent aperture allows the shroud segment to float in a circumferential direction.

18. The turbine shroud assembly of claim 17 wherein smaller sized aperture is centrally located in the radially outward flange.

19. The turbine shroud assembly of claim 17 wherein each of the plurality of flanged collars include a flange portion attached to a stem portion, and have an aperture extending through both the flange portion and stem portion.

20. The turbine shroud assembly of claim 19 wherein the plurality of apertures in the radially outward extending flange contain a counter-bore for reception of the flange portion of each of the plurality of flanged collars.

Assignees

• United Technologies Corp

Inventors

• Broomer Mark
• Keene Russell E
• Davis Timothy M
• Rogers Mark J

Classifications

• F05D2230/642

  using maintaining alignment while permitting differential dilatation · CPC title

• F01D11/122 Primary

  with erodable or abradable material (blades having cutting or grinding tips F01D5/20) · CPC title

• F01D25/246

  Fastening of diaphragms or stator-rings · CPC title

• F05D2260/38

  by a spring, i.e. spring loaded or biased towards a certain position · CPC title

• F05D2240/11

  Shroud seal segments · CPC title