Composite piston ring seal for axially and circumferentially translating ducts

Patent metadata

Field	Value
Publication number	US-9945295-B2
Application number	US-201514727475-A
Country	US
Kind code	B2
Filing date	Jun 1, 2015
Priority date	Jun 1, 2015
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

A seal system is provided. The seal system may comprise a first duct having an annular geometry, a second duct overlapping the first duct in a radial direction, and a seal disposed between the first duct and the second duct. The seal may comprise a groove defined by the first duct and a piston configured to slideably engage the groove.

First claim

What is claimed is:

1. A seal system for a gas turbine engine, comprising:
a first duct having an annular geometry and including a first surface exposed to a bypass airflow, wherein the first surface is on a radially inward portion of the annular geometry, and wherein the first duct is located proximate a cowling of the gas turbine engine;
a second duct coaxial to the first duct, the second duct disposed radially outward from the first duct and including a second surface exposed to the bypass airflow, wherein a forward portion of the second duct circumferentially overlaps an aft portion of the first duct, and wherein the second duct is aft of the cowling; and
a seal disposed between the aft portion of the first duct and the forward portion of the second duct, the seal comprising:
a groove defined by the first duct; and
a piston configured to slideably engage the groove.

2. The seal system of claim 1 , wherein the piston comprises a fibrous material.

3. The seal system of claim 2 , wherein the piston comprises a glass fiber-reinforced polymer (GFRP) or an aramid fiber-reinforced polymer (AFRP).

4. The seal system of claim 1 , further including a bumper disposed between the aft portion of the first duct and the forward portion of the second duct.

5. The seal system of claim 4 , wherein the bumper comprises at least one of a glass fiber-reinforced polymer (GFRP) or an aramid fiber-reinforced polymer (AFRP).

6. The seal system of claim 4 , wherein the bumper comprises the annular geometry.

7. The seal system of claim 1 , wherein the piston comprises an elliptical shape.

8. The seal system of claim 1 , further comprising a spring disposed between a radial surface of the groove and an end of the piston opposite the second duct.

9. A gas turbine engine, comprising:
a compressor;
a combustor disposed aft of the compressor and in fluid communication with the compressor;
a turbine aft of the combustor and in fluid communication with the combustor;
an inner duct radially outward from the turbine, the inner duct including a first surface exposed to a bypass airflow;
an outer duct radially outward from the inner duct, the outer duct including a second surface exposed to the bypass airflow, wherein a forward portion of the outer duct circumferentially overlaps an aft portion of the inner duct;
a groove formed aft of the turbine and in the aft portion of the inner duct; and
a piston configured to slideably engage the groove.

10. The gas turbine engine of claim 9 , wherein the piston comprises a fibrous material.

11. The gas turbine engine of claim 10 , wherein the piston comprises at least one of a glass fiber-reinforced polymer (GFRP) or an aramid fiber-reinforced polymer (AFRP).

12. The gas turbine engine of claim 9 , further comprising a bumper bonded to the inner duct.

13. The gas turbine engine of claim 12 , wherein the bumper comprises at least one of a glass fiber-reinforced polymer (GFRP) or an aramid fiber-reinforced polymer (AFRP).

14. The gas turbine engine of claim 13 , wherein the bumper comprises an annular geometry.

15. The gas turbine engine of claim 9 , wherein the piston comprises an elliptical shape.

16. The gas turbine engine of claim 9 , further comprising a spring disposed in the groove.

Assignees

• United Technologies Corp

Inventors

• Porter Steven D
• Peters Donald W
• Bangerter James P

Classifications

• F05D2260/57

  using servos, independent actuators, etc. · CPC title

• Y02T50/672

  Cross-Sectional Technologies · mapped topic

• F16J15/3488

  Split-rings · CPC title

• F05D2240/55

  Seals · CPC title

• F05D2250/34

  translated · CPC title