Sealing configurations with active cooling features

Patent metadata

Field	Value
Publication number	US-10329951-B2
Application number	US-201715617598-A
Country	US
Kind code	B2
Filing date	Jun 8, 2017
Priority date	Jun 8, 2017
Publication date	Jun 25, 2019
Grant date	Jun 25, 2019

Abstract

Sealing configurations with active cooling features are provided. A forward sealing configuration may comprise a forward bellows spring configured to interface with a forward seal plate. An aft sealing configuration may comprise an aft bellows configured to interface with an aft seal plate. The forward bellows spring and the aft bellows spring may be configured to provide an axial force against each respective seal plate. The forward seal plate and the aft seal plate may include cooling holes configured to deliver a lubricating fluid to each respective seal interface to provide active cooling to each respective sealing configuration.

First claim

What is claimed is:

1. A sealing configuration for an axially forward section of a bearing compartment of a gas turbine engine, comprising:
a seal plate disposed axially forward of a bearing in the bearing compartment, the seal plate comprising:
a first seal plate surface axially opposite a second seal plate surface;
a fluid cavity defining a void on the second seal plate surface, wherein the fluid cavity is configured to receive a lubricating fluid from a lubricating spray nozzle in the bearing compartment; and
a plurality of cooling holes in fluid communication with the fluid cavity, each cooling hole defining a channel through the first seal plate surface into the fluid cavity; and

a bellows spring configured to interface with the first seal plate surface of the seal plate, wherein the bellows spring is configured to provide an axial force against the first seal plate surface of the seal plate.

2. The sealing configuration of claim 1 , further comprising:
a seal housing coupled to a first axial end of the bellows spring;
a carbon carrier coupled to a second axial end of the bellows spring; and
a carbon coupled to the carbon carrier, wherein the carbon is configured to provide a sealing interface against the first seal plate surface of the seal plate.

3. The sealing configuration of claim 1 , wherein the first seal plate surface comprises a first seal plate contact surface configured to interface with the bellows spring.

4. The sealing configuration of claim 3 , wherein the first seal plate contact surface defines a hydrodynamic groove configured to provide a hydrodynamic lift force to the interface of the first seal plate contact surface and the bellows spring.

5. The sealing configuration of claim 4 , wherein the first seal plate surface comprises a chrome carbide coating.

6. A sealing configuration for an axially aft section of a bearing compartment of a gas turbine engine, comprising:
a seal plate disposed axially forward of a bearing in the bearing compartment, the seal plate comprising:
a first seal plate surface axially opposite a second seal plate surface;
a fluid dam defining a void on a radially inner surface of the seal plate; and
a plurality of cooling holes in fluid communication with the fluid dam, each cooling hole defining a channel through the second seal plate surface into the fluid dam;

a carbon configured to provide a sealing interface against the second seal plate surface of the seal plate;
a carbon carrier coupled to the carbon and configured to provide radial support to the carbon;
a bellows spring configured to interface with the carbon carrier to provide an axial force against the second seal plate surface of the seal plate; and
a seal housing coupled to the bellows springs and configured to provide radial support to the bellows spring.

7. The sealing configuration of claim 6 , wherein the second seal plate surface comprises a second seal plate contact surface configured to interface with the carbon.

8. The sealing configuration of claim 7 , wherein the second seal plate contact surface defines a hydrodynamic groove configured to provide a hydrodynamic lift force to the sealing interface of the second seal plate contact surface and the carbon.

9. The sealing configuration of claim 8 , wherein the second seal plate surface comprises a chrome carbide coating.

10. A gas turbine engine, comprising:
a bull gear coupled to a rotating shaft;
a bearing coupled to the bull ring;
a forward sealing configuration coupled to the rotating shaft forward the bull gear and the bearing, the forward sealing configuration comprising:
a forward seal plate, comprising:
a first forward seal plate surface axially opposite a second forward seal plate surface;
a fluid cavity defining a void on the second forward seal plate surface; and
a plurality of forward cooling holes in fluid communication with the fluid cavity, each forward cooling hole defining a channel through the first forward seal plate surface into the fluid cavity; and

a forward bellows spring configured to interface with the first forward seal plate surface, wherein the forward bellows spring is configured to provide a first axial force against the first forward seal plate surface; and

an aft sealing configuration coupled to the bull gear aft the bearing, the aft sealing configuration comprising:
an aft seal plate, comprising:
a first aft seal plate surface axially opposite a second aft seal plate surface;
a fluid dam defining a void on a radially inner surface of the aft seal plate; and
a plurality of aft cooling holes in fluid communication with the fluid dam, each aft cooling hole defining a channel through the second aft seal plate surface into the fluid dam; and

an aft bellows spring configured to interface with the second aft seal plate surface, wherein the aft bellows spring is configured to provide a second axial force against the second aft seal plate surface.

11. The gas turbine engine of claim 10 , further comprising a lubricating spray nozzle located forward of the bull gear, the lubricating spray nozzle comprising a first fluid outlet and a second fluid outlet.

12. The gas turbine engine of claim 11 , wherein a radially inner surface of the bull gear and a radially outer surface of the rotating shaft define a fluid passage configured to receive a lubricating fluid from the first fluid outlet of the lubricating spray nozzle, and wherein the fluid passage is in fluid communication with the fluid dam of the aft seal plate.

13. The gas turbine engine of claim 12 , wherein the aft cooling holes are configured to receive the lubricating fluid from the fluid dam and deliver the lubricating fluid to a location adjacent to the interface of the second aft seal plate surface and the aft bellows spring.

14. The gas turbine engine of claim 11 , wherein the fluid cavity of the forward seal plate is configured to receive a lubricating fluid from the second fluid outlet of the lubricating spray nozzle.

15. The gas turbine engine of claim 14 , wherein the forward cooling holes are configured to receive the lubricating fluid from the fluid cavity and deliver the lubricating fluid to a location adjacent to the interface of the first forward seal plate surface and the forward bellows spring.

16. The gas turbine engine of claim 10 , wherein the forward sealing configuration further comprises:
a forward seal housing coupled to a first axial end of the forward bellows spring;
a forward carbon carrier coupled to a second axial end of the forward bellows spring; and
a forward carbon coupled to the forward carbon carrier, wherein the forward carbon is configured to provide a forward sealing interface against the first forward seal plate surface of the forward seal plate.

17. The gas turbine engine of claim 10 , wherein the aft sealing configuration further comprises:
an aft seal housing coupled to a first axial end of the aft bellows spring;
an aft carbon carrier coupled to a second axial end of the aft bellows spring; and
an aft carbon coupled to the aft carbon carrier, wherein the aft carbon is configured to provide an aft sealing interface against the second aft seal plate surface of the aft seal plate.

18. The gas turbine engine of claim 10 , wherein the first forward seal plate surface of the forward seal plate defines a plurality of forward hydrodynamic grooves configured to provide a hydrodynamic lift force to the interface of the first forward seal plate surface and the forward bellows spring.

19. The gas turbine engine of

Assignees

• United Technologies Corp

Inventors

• Walker Brady

Classifications

• F16J15/3404

  and characterised by parts or details relating to lubrication, cooling or venting of the seal · CPC title

• F05D2260/52

  involving springs · CPC title

• F05D2260/38

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

• F01D11/003

  by packing rings; Mechanical seals · CPC title

• F05D2220/32

  in gas turbines · CPC title