Systems and methods for anti-rotational features

Patent metadata

Field	Value
Publication number	US-9745864-B2
Application number	US-201514665780-A
Country	US
Kind code	B2
Filing date	Mar 23, 2015
Priority date	Apr 16, 2014
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

Systems and methods are disclosed for anti-rotation lugs. A stator for a gas turbine engine may comprise an outer shroud, an inner shroud, and a plurality of vanes located between the outer shroud and the inner shroud. A plurality of anti-rotation lugs may be coupled to the inner shroud. The anti-rotation lugs may be configured to contact a diffuser case in order to prevent rotation of the stator. The anti-rotation lugs may comprise a body and a tapered shoulder. The tapered shoulder may distribute stress concentrations in the anti-rotation lugs.

First claim

The invention claimed is:

1. A stator comprising:
an inner shroud; and
an anti-rotation lug coupled to the inner shroud, the anti-rotation lug extending in an axial direction from the inner shroud and comprising:
a body comprising a contact face; and
a tapered shoulder between the contact face and the inner shroud;
wherein the tapered shoulder and the inner shroud intersect in a shoulder fillet; and
wherein the contact face and the tapered shoulder intersect in a leading fillet.

2. The stator of claim 1 , wherein the contact face is configured to contact a diffusor case to prevent the stator from rotating.

3. The stator of claim 1 , wherein the shoulder fillet is located between the tapered shoulder and an inner ring of the stator.

4. The stator of claim 1 , further comprising a trailing fillet located between a trailing side of the anti-rotation lug and an inner ring of the stator.

5. The stator of claim 1 , wherein the tapered shoulder is oriented transverse to an engine axis at an angle of between 60-80 degrees.

6. The stator of claim 1 , wherein the leading fillet comprises a radius of at least 0.050 inches, and wherein the shoulder fillet comprises a radius of at least 0.200 inches.

7. A stator comprising:
an outer shroud;
at least one vane coupled to the outer shroud;
an inner shroud coupled to the at least one vane, the inner shroud comprising an outer ring and an inner ring, the inner ring extending axially from the outer ring; and
an anti-rotation lug coupled to the inner shroud, the anti-rotation lug extending in an axial direction from the inner ring and comprising:
a body comprising a contact face; and
a tapered shoulder between the contact face and the inner ring;
wherein the tapered shoulder and the inner ring intersect in a shoulder fillet; and
wherein the contact face and the tapered shoulder intersect in a leading fillet.

8. The stator of claim 7 , wherein the inner ring extends axially from the outer ring along an engine axis.

9. The stator of claim 7 , wherein the leading fillet comprises a radius of about 0.062 inches.

10. The stator of claim 7 , wherein the anti-rotation lug is configured to contact a diffuser case to prevent the stator from rotating.

11. The stator of claim 7 , wherein the inner shroud comprises a stepped profile.

12. An assembly for a gas turbine engine, the assembly comprising:
a stator having an anti-rotation lug extending axially from an inner shroud of the stator, wherein the anti-rotation lug includes a tapered shoulder between a contact face of the anti-rotation lug and the inner shroud; and
a diffuser case in contact with the contact face of the anti-rotation lug.

13. The assembly of claim 12 , wherein the anti-rotation lug is coupled to an inner ring of the stator.

14. The assembly of claim 12 , wherein the inner shroud comprises a stepped profile.

15. The assembly of claim 12 , wherein the stator comprises twenty-four anti-rotation lugs.

16. The assembly of claim 12 , wherein the stator comprises a single component manufactured by at least one of casting, machining, additive manufacturing, and assembly of component parts.

Assignees

• United Technologies Corp

Inventors

• Willett Matthew R
• Warner Charles H
• Cassella Gerald D
• Earl Jonathan J
• Lyons Christopher B

Classifications

• F05D2240/12

  Fluid guiding means, e.g. vanes · CPC title

• F01D9/041

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

• F05D2240/80

  Platforms for stationary or moving blades · CPC title

• F01D25/246 Primary

  Fastening of diaphragms or stator-rings · CPC title

• F05D2220/32

  in gas turbines · CPC title