Seal arc segment with anti-rotation feature

Patent metadata

Field	Value
Publication number	US-10415414-B2
Application number	US-201615071306-A
Country	US
Kind code	B2
Filing date	Mar 16, 2016
Priority date	Mar 16, 2016
Publication date	Sep 17, 2019
Grant date	Sep 17, 2019

Abstract

A seal arc segment includes a body including a radially inner surface and a radially outer surface. The radially inner surface and the radially outer surface are located between a first circumferential end and a second circumferential end. A recessed portion defines a cavity in the radially outer surface. A notch is located in an edge of the recessed portion adjacent the first circumferential end.

First claim

What is claimed is:

1. A seal arc segment comprising:
a body including a radially inner surface and a radially outer surface, the radially inner surface and the radially outer surface are located between a first circumferential end and a second circumferential end;
a recessed portion defining a cavity in the radially outer surface; and
a notch located in an edge of the recessed portion adjacent the first circumferential end, wherein the notch includes a first circumferential end wall for engaging a mating component to prevent circumferential rotation of the body and the first circumferential wall includes a flat surface.

2. The seal arc segment of claim 1 , including a first retention member adjacent the first circumferential end of the seal arc segment for engaging a mounting structure and a first recessed portion located radially inward from the first retention member.

3. The seal arc segment of claim 2 , wherein the first recessed portion and the notch are formed by a machining process and the seal arc segment comprises a ceramic material.

4. The seal arc segment of claim 2 , wherein the first recessed portion includes a curved surface extending between axial ends of the body.

5. The seal arc segment of claim 2 , including a second retention member adjacent the second circumferential end of the seal arc segment for engaging the mounting structure and a curved surface extending between axial ends of the body.

6. The seal arc segment of claim 1 , wherein the radially outer surface defines perimeter of the recessed portion.

7. A gas turbine engine comprising:
a rotor section including a rotor having a plurality of blades and at least one annular seal assembly circumscribing the rotor, the annular seal assembly comprising:
at least one seal arc segment including:
a body having a radially inner surface and a radially outer surface, the radially inner surface and the radially outer surface are located between a first circumferential end and a second circumferential end;
a recessed portion defining a cavity in the radially outer surface; and
a notch located in an edge of the recessed portion adjacent the first circumferential end; and

a mating component engaging the notch and an engine static structure.

8. The gas turbine engine of claim 7 , including a first retention member adjacent the first circumferential end of the seal arc segment for engaging a mounting structure and a first recessed portion located radially inward from the first retention member.

9. The gas turbine engine of claim 8 , wherein the first recessed portion and the notch are formed by a machining process.

10. The gas turbine engine of claim 9 , wherein the seal arc segment comprises a ceramic material and the mating component comprises a metallic material.

11. The gas turbine engine of claim 10 , wherein the first recessed portion includes a curved surface that extends between axial ends of the body.

12. The gas turbine engine of claim 7 , wherein the mating component includes a tab that extends in a radial direction and an axial direction for engaging a recess in the engine static structure.

13. The gas turbine engine of claim 12 , wherein the mating component includes a circumferentially extending portion having a first circumferential end for engaging the notch and a second circumferential end engaging a portion of the body.

14. The gas turbine engine of claim 13 , wherein the notch includes a first circumferential end wall for engaging a mating component to prevent circumferential rotation of the body relative to the engine static structure.

15. The gas turbine engine of claim 14 , wherein the first circumferential end of the mating component includes one of a crowned surface or a flat surface and the first circumferential wall of the notch includes the other of the crowned surface or the flat surface.

16. The gas turbine engine of claim 14 , wherein the first circumferential end of the mating component includes a crowned surface and the first circumferential wall of the notch includes one of a flat surface or a recessed surface for engaging the crowned surface.

17. A method for maintaining positioning of a seal assembly, the method comprising:
locating a mating component in a recessed portion on a radially outer side of the seal arc segment;
mounting the seal arc segment to a mounting structure;
engaging a notch adjacent the recessed portion in the seal arc segment with a first circumferential end of the mating component; and
engaging at least one of a recess or a radially extending projection in an engine static structure with the other of the recess or the radially extending projection on the mating component.

18. The method of claim 17 , including restricting circumferential movement of the seal arc segment while the mating component engaging the engine static structure and the seal arc segment.

19. The method of claim 17 , wherein the seal arc segment includes a first retention member and a first recessed portion adjacent the first retention member, the first recessed portion and the notch formed in the seal arc segment by a machining process.

Assignees

• United Technologies Corp

Inventors

• Corcoran Christopher
• Mccaffrey Michael G
• Hagan Benjamin F

Classifications

• F01D25/246

  Fastening of diaphragms or stator-rings · CPC title

• F01D11/122

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

• F01D11/12

  using a rubstrip, e.g. erodible. deformable or resiliently-biased part · CPC title

• F01D9/04

  forming ring or sector · CPC title

• F01D5/284

  Selection of ceramic materials · CPC title