Bleed valve with neutral or closing bias

Patent metadata

Field	Value
Publication number	US-10473036-B2
Application number	US-201715424348-A
Country	US
Kind code	B2
Filing date	Feb 3, 2017
Priority date	Feb 3, 2017
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

A compressor assembly may include a compressor case disposed about an axis. A bleed valve may be disposed about the compressor case to translate axially and/or rotationally relative to the compressor case. A first seal may be disposed in a forward seal housing of the bleed valve a first radial distance from the axis. A first sealing wall may be fixed relative to the compressor case and configured to engage the first seal. A second seal may be disposed in an aft seal housing of the bleed valve at a second radial distance from the axis. The first radial distance may be substantially equal to the second radial distance. A second sealing wall may be fixed relative to the compressor case and configured to engage the second seal.

First claim

What is claimed is:

1. A bleed valve assembly, comprising:
a bleed valve disposed about an axis and configured to translate relative to a compressor case;
a first seal disposed in a forward seal housing of the bleed valve, wherein the first seal is disposed at a first radial distance from the axis; and
a second seal disposed in an aft seal housing of the bleed valve, wherein the second seal is disposed at a second radial distance from the axis, wherein the first radial distance is substantially equal to the second radial distance and wherein the bleed valve is configured to have a neutral bias based on a pressure difference acting on the bleed valve.

2. The bleed valve assembly of claim 1 , wherein the bleed valve is split circumferentially into a plurality of segments.

3. The bleed valve assembly of claim 1 , wherein the first seal protrudes from the forward seal housing in an aft direction.

4. The bleed valve assembly of claim 1 , wherein a surface area of an aft-facing surface of the forward seal housing is substantially equal to a surface area of a forward-facing surface of the aft seal housing.

5. The bleed valve assembly of claim 1 , comprising a bell crank coupled to the bleed valve.

6. The bleed valve assembly of claim 5 , comprising a bracket coupled to the bell crank and the compressor case.

7. The bleed valve assembly of claim 6 , comprising an actuator coupled to the bell crank and configured to urge the bleed valve in at least one of an axial or rotational direction.

8. The bleed valve assembly of claim 6 , comprising a support link coupled to the bleed valve and configured to passively support the bleed valve in response to at least one of axial or rotational translation of the bleed valve.

9. A compressor assembly, comprising:
a compressor case disposed about an axis;
a bleed valve disposed about the compressor case and configured to translate at least one of axially or rotationally relative to the compressor case;
a first seal disposed in a forward seal housing of the bleed valve, wherein the first seal is disposed at a first radial distance from the axis;
a first sealing wall fixed relative to the compressor case and configured to engage the first seal;
a second seal disposed in an aft seal housing of the bleed valve, wherein the second seal is disposed at a second radial distance from the axis, wherein the first radial distance is substantially equal to the second radial distance and wherein the bleed valve is configured to have a neutral bias based on a pressure difference acting on the bleed valve; and
a second sealing wall fixed relative to the compressor case and configured to engage the second seal.

10. The compressor assembly of claim 9 , wherein the bleed valve is split circumferentially into a plurality of segments.

11. The compressor assembly of claim 9 , wherein the first seal protrudes from the forward seal housing in an aft direction.

12. The compressor assembly of claim 9 , wherein an aft-facing surface of the forward seal housing has a surface area substantially equal to a surface area of a forward-facing surface of the aft seal housing.

13. The compressor assembly of claim 9 , comprising a bell crank coupled to the bleed valve.

14. The compressor assembly of claim 13 , comprising a bracket coupled to the bell crank and the compressor case.

15. The compressor assembly of claim 14 , comprising an actuator coupled to the bell crank and configured to urge the bleed valve in an axial direction.

16. The compressor assembly of claim 15 , comprising a support link coupled to the bleed valve and configured to passively support the bleed valve in response to at least one of axial or rotational translation of the bleed valve.

17. A gas turbine engine, comprising:
a compressor section configured to rotate about an axis, the compressor section comprising:
a compressor case,
a bleed valve disposed about the compressor case and configured to translate axially relative to the compressor case,
a first seal disposed in a forward seal housing of the bleed valve, wherein the first seal is disposed at a first radial distance from the axis, and
a second seal disposed in an aft seal housing of the bleed valve, wherein the second seal is disposed at a second radial distance from the axis and wherein the bleed valve is configured to have a neutral bias based on a pressure difference based on a pressure difference acting on the bleed valve;

a combustor section aft of the compressor section and in fluid communication with the compressor section; and
a turbine section aft of the combustor section and in fluid communication with the combustor section.

18. The gas turbine engine of claim 17 , wherein an aft-facing surface of the forward seal housing has a surface area substantially equal to a surface area of a forward-facing surface of the aft seal housing.

19. The gas turbine engine of claim 17 , comprising:
a bell crank coupled to the bleed valve; and
an actuator coupled to the bell crank and configured to urge the bleed valve in an axial direction.

Assignees

• United Technologies Corp

Inventors

• Little Jonathan

Classifications

• F01D17/141

  by means of shiftable members or valves obturating part of the flow path · CPC title

• F05D2260/56

  using cams or eccentrics · CPC title

• F01D17/105

  by passing part of the fluid · CPC title

• F04D27/0215

  Arrangements therefor, e.g. bleed or by-pass valves · CPC title

• F02C9/18 Primary

  by bleeding, bypassing or acting on variable working fluid interconnections between turbines or compressors or their stages {(F02C3/113 takes precedence)} · CPC title