Split damped outer shroud for gas turbine engine stator arrays

Patent metadata

Field	Value
Publication number	US-9797262-B2
Application number	US-201414286510-A
Country	US
Kind code	B2
Filing date	May 23, 2014
Priority date	Jul 26, 2013
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

A vane cluster includes a split damped outer shroud and an inner shroud spaced from the split damped outer shroud with a multiple of stator vane airfoils that extend between the split damped outer shroud and the inner shroud.

First claim

What is claimed is:

1. A vane cluster, comprising:
a portion of a split damped outer shroud comprising a plurality of shroud segments and a plurality of split cuts, wherein each laterally adjacent pair of said shroud segments is separated by a respective one of said split cuts;
an unsegmented inner shroud portion spaced from the portion of said split damped outer shroud;
a multiple of stator vane airfoils that extend between the portion of said split damped outer shroud and said unsegmented inner shroud portion; and
a plurality of spacer keys, each of said spacer keys arranged with at least one of said split cuts, wherein a first of said spacer keys extends laterally between and laterally contacts a radially extending first surface of a first of said shroud segments and a radially extending second surface of a second of said shroud segments, and said first surface is substantially parallel with said second surface.

2. The vane cluster as recited in claim 1 , wherein each of said split cuts is between a respective adjacent pair of said stator vane airfoils.

3. The vane cluster as recited in claim 2 , wherein each split cut is about ten-thousandths of an inch wide (0.010″; 0.254 mm).

4. The vane cluster as recited in claim 1 , wherein each spacer key extends between a forward hook and an aft hook of said split damped outer shroud.

5. The vane cluster as recited in claim 1 , wherein each spacer key defines an interference fit interface with said split damped outer shroud.

6. The vane cluster as recited in claim 1 , wherein each spacer key defines an interface with said split damped outer shroud of one-thousandths of an inch wide (0.001″; 0.025 mm).

7. The vane cluster as recited in claim 1 , wherein each spacer key defines an interface with said split damped outer shroud of about zero.

8. The vane cluster as recited in claim 1 , further comprising a shiplap that surrounds each spacer key.

9. The vane cluster as recited in claim 1 , further comprising an anti-rotation feature that extends from said split damped outer shroud adjacent each of said multiple of stator vane airfoils.

10. The vane cluster as recited in claim 1 , further comprising a seal land mounted directly to said inner shroud.

11. The vane cluster as recited in claim 1 , further comprising a seal land brazed to said inner shroud.

12. The vane cluster as recited in claim 11 , wherein said seal land is a full hoop.

13. A vane cluster, comprising:
a split damped outer shroud comprising a plurality of shroud segments and a plurality of split cuts, wherein each laterally adjacent pair of said shroud segments is separated by a respective one of said split cuts;
an inner shroud spaced from said split damped outer shroud;
a multiple of stator vane airfoils that extend between said split damped outer shroud and said inner shroud; and
a plurality of spacer keys, each of said spacer keys arranged with at least one of said split cuts, wherein a first of said spacer keys extends laterally between a first surface of a first of said shroud segments and a second surface of a second of said shroud segments, and said first surface is substantially parallel with said second surface;
wherein said spacer key extends between each two of said multiple of split cuts.

14. A vane cluster, comprising:
a split damped outer shroud;
an inner shroud spaced from said split damped outer shroud; and
a multiple of stator vane airfoils that extend between said split damped outer shroud and said inner shroud, wherein said split damped outer shroud includes a split cut between each of said multiple of stator vane airfoils;
a spacer key adjacent each split cut, wherein said spacer key extends between each two of said multiple of split cuts; and
a pedestal that extends from said split damped outer shroud to at least partially support said spacer key.

15. The vane cluster as recited in claim 14 , wherein each spacer key is generally U-shaped.

16. A method of damping a stator array in a gas turbine engine, the method comprising:
locating a multiple of split cuts in a split damped outer shroud to provide relative frictional movement between each of a multiple of stator vane airfoils, wherein said split damped outer shroud comprises a plurality of shroud segments, and each laterally adjacent pair of said shroud segments is separated by a respective one of said split cuts;
locating a respective one of a plurality of spacer keys adjacent each of said split cuts, wherein a first of said spacer keys extends laterally between a first surface of a first of said shroud segments and a second surface of a second of said shroud segments, and said first surface is substantially parallel with said second surface; and
bridging each two of the multiple of split cuts with one said spacer key.

17. The method as recited in claim 16 , further comprising:
anti-rotating the stator array at each of the multiple of stator vane airfoils.

18. The method as recited in claim 16 , wherein the first of the spacer keys is configured to backfill a kerf loss of a respective one of the split cuts to maintain a load between the first of said shroud segments and the second of said shroud segments.

Assignees

• United Technologies Corp

Inventors

• Richardson Carl S
• Rogers Mark J
• Earl Jonathan J
• Carman Kenneth E
• Hayford Richard K

Classifications

• F01D9/041

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

• Y10T29/49236

  Fluid pump or compressor making · CPC title

• Y02T50/672

  Cross-Sectional Technologies · mapped topic

• F01D25/06

  for preventing blade vibration (means on blade-carrying members or blades F01D5/00) · CPC title

• F01D5/22 Primary

  Blade-to-blade connections, {e.g. for damping vibrations} · CPC title