Bellows secondary seal for cantilevered hydrostatic advanced low leakage seal

Patent metadata

Field	Value
Publication number	US-2020362716-A1
Application number	US-201916410072-A
Country	US
Kind code	A1
Filing date	May 13, 2019
Priority date	May 13, 2019
Publication date	Nov 19, 2020
Grant date	—

Abstract

A hydrostatic seal configured to be disposed between relatively rotatable components. The hydrostatic seal includes a seal carrier. The hydrostatic seal also includes a beam extending axially from a forward end to an aft end, the beam cantilevered to the seal carrier at one of the forward end and the aft end, the beam free at the other end. The hydrostatic seal further includes a bellows seal operatively coupled to the seal carrier and in contact with the beam.

First claim

What is claimed is:

1 . A hydrostatic seal configured to be disposed between relatively rotatable components, the hydrostatic seal comprising:
a seal carrier; a beam extending axially from a forward end to an aft end, the beam cantilevered to the seal carrier at one of the forward end and the aft end, the beam free at the other end; and a bellows seal operatively coupled to the seal carrier and in contact with the beam.

2 . The hydrostatic seal of claim 1 , wherein the bellows seal is disposed between a radially inward surface of the seal carrier and a radially outward surface of the beam.

3 . The hydrostatic seal of claim 1 , wherein the bellows seal extends longitudinally in a direction perpendicular to a radially outer surface of the beam.

4 . The seal of claim 1 , wherein the beam includes a flange extending radially outwardly into a region at least partially defined by the seal carrier and the beam, the flange oriented at an angle between parallel and perpendicular to a radially outer surface of the beam, the bellows seal in contact with the flange.

5 . The seal of claim 4 , wherein a first end of the bellows seal is operatively coupled to the seal carrier and a second end of the bellows seal is in contact with a forward face of the flange.

6 . The seal of claim 1 , wherein the bellows seal is slotted to allow deflection of the beam.

7 . The seal of claim 1 , wherein the beam is cantilevered to the seal carrier at the forward end of the beam.

8 . The seal of claim 1 , wherein the beam is cantilevered to the seal carrier at the aft end of the beam.

9 . The seal of claim 1 , wherein the bellows seal is in contact with the beam proximate the end of the beam that is free.

10 . A seal assembly disposed in a gas turbine engine, the seal assembly comprising:
a stator; a rotor; and a hydrostatic seal disposed between the stator and the rotor, the hydrostatic seal comprising:
a seal carrier;
a beam extending axially from a forward end to an aft end, the beam cantilevered to the seal carrier at one of the forward end and the aft end, the beam free at the other end; and
a slotted bellows seal extending longitudinally from a first end to a second end, the first end operatively coupled to the seal carrier at the first end.

11 . The seal assembly of claim 10 , wherein the bellows seal is disposed between a radially inward surface of the seal carrier and a radially outward surface of the beam.

12 . The seal assembly of claim 10 , wherein the bellows seal extends longitudinally in a direction perpendicular to a radially outer surface of the beam.

13 . The seal assembly of claim 10 , wherein the second end of the bellows seal is in contact with a radially outer surface of the beam.

14 . The seal assembly of claim 10 , wherein the beam includes a flange extending radially outwardly into a region at least partially defined by the seal carrier and the beam, the flange oriented at an angle between parallel and perpendicular to a radially outer surface of the beam, the bellows seal in contact with the flange.

15 . The seal assembly of claim 10 , wherein the beam is cantilevered to the seal carrier at the forward end of the beam.

16 . The seal assembly of claim 10 , wherein the beam is cantilevered to the seal carrier at the aft end of the beam.

17 . The seal assembly of claim 10 , wherein the bellows seal is in contact with the beam proximate the end of the beam that is free.

18 . A gas turbine engine comprising:
a compressor section; a combustor section; a turbine section; and a seal assembly disposed in the gas turbine engine, the seal assembly comprising a stator, a rotor, and a hydrostatic seal disposed between the stator and the rotor, the hydrostatic seal comprising:
a seal carrier;
a beam extending axially from a forward end to an aft end, the beam cantilevered to the seal carrier at the aft end, the beam free at the forward end; and
a bellows seal in contact with the seal carrier and in contact with the beam.

19 . The gas turbine engine of claim 18 , wherein the bellows seal is slotted to allow deflection of the beam.

Assignees

• United Technologies Corp

Inventors

• Glahn Jorn Axel
• Hilbert Brian F

Classifications

• F16J15/4472

  with axial path · CPC title

• F01D11/04 Primary

  using sealing fluid, e.g. steam · CPC title

• F05D2220/32

  in gas turbines · CPC title

• F01D11/025

  Seal clearance control; Floating assembly; Adaptation means to differential thermal dilatations · CPC title

• F16J15/442 Primary

  segmented · CPC title