Bleed air duct joint insulation means

Patent metadata

Field	Value
Publication number	US-9228496-B2
Application number	US-201213611875-A
Country	US
Kind code	B2
Filing date	Sep 12, 2012
Priority date	Sep 21, 2011
Publication date	Jan 5, 2016
Grant date	Jan 5, 2016

Abstract

A bleed air duct joint insulation means is disclosed in which a leak vent comprises valve means.

First claim

The invention claimed is:

1. A bleed air duct for use with an overheat detection system, said bleed air duct comprising:
an insulation jacket arranged to encapsulate a bleed air duct joint;
a vent for providing fluid communication between an interior and an exterior of said insulation jacket;
a valve located in said vent, said valve comprises a body section defining one or more conduits providing fluid communication through said valve, a valve member and a biasing member disposed sequentially within said body section with respect to a flow direction through said one or more conduits, said valve being arranged so as to enable fluid flow from said interior to said exterior of said insulation jacket when fluid pressure in said interior exceeds a predetermined positive pressure threshold.

2. A bleed air duct according to claim 1 in which said valve comprises a pressure holding valve.

3. A bleed air duct according to claim 1 in which said vent is arranged adjacent a sensor for the overheat detection system.

4. A bleed air duct according to claim 1 in which said predetermined positive pressure threshold represents a bleed air leakage rate of 10 g/s.

5. A bleed air duct according to claim 1 in which said vent further comprises a diffuser for diffusing fluid flow from said vent.

6. A bleed air duct according to claim 1 , wherein said body section comprises a first body section and a second body section, wherein said valve member is biased by said biasing member into a first position in which fluid flow through said valve is prevented and said valve member is moveable in response to said fluid pressure from said interior of said insulation jacket exceeding said predetermined positive threshold into a second position in which fluid flows through said valve to said exterior.

7. A bleed air duct according to claim 6 in which said valve is fixed to said insulation jacket by capture of a periphery of said vent between said first and second body sections.

Assignees

• West Nicholas
• Airbus Operations Ltd

Inventors

• West Nicholas

Classifications

• F16K15/026

  the valve member being a movable body around which the medium flows when the valve is open · CPC title

• F05D2260/80

  Diagnostics · CPC title

• F04B39/102

  the members being disc valves · CPC title

• F04D27/0215

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

• F02C6/08 Primary

  the gas being bled from the gas-turbine compressor · CPC title