Selectable barrier filtration system

Patent metadata

Field	Value
Publication number	US-11077957-B2
Application number	US-201815878075-A
Country	US
Kind code	B2
Filing date	Jan 23, 2018
Priority date	Jan 23, 2017
Publication date	Aug 3, 2021
Grant date	Aug 3, 2021

Abstract

An air intake system (AIS) has a plenum and an inlet barrier filter associated with the plenum, through which air can selectively enter the plenum. The AIS also has an inlet duct associated with the plenum, through which air can selectively enter the plenum. The AIS also has a bypass door associated with the inlet duct, the bypass door being configured to selectively change an amount of air allowed to pass through the inlet duct. The AIS also has a filter airflow change device configured to change an amount of airflow allowed through the inlet barrier filter.

First claim

What is claimed is:

1. An air intake system (AIS), comprising:
a plenum;
an inlet barrier filter associated with the plenum, through which air can selectively enter the plenum;
an inlet duct associated with the plenum, through which air can selectively enter the plenum;
a bypass door associated with the inlet duct, the bypass door being configured to selectively change an amount of air allowed to pass through the inlet duct; and
a filter airflow change device configured to change an amount of airflow allowed through the inlet barrier filter;
wherein the filter airflow change device comprises a tubular slide valve and a carrier duct and wherein the slide valve is configured to receive at least a portion of a tubular portion of the carrier duct;
wherein when the tubular slide valve is fully extended relative to the carrier duct, airflow from the inlet duct to an engine intake duct via the inlet barrier filter is substantially reduced and airflow to the engine intake duct via the inlet duct is substantially increased; and
wherein movement of the tubular slide valve relative to the carrier duct changes an amount of longitudinal overlap between the tubular slide valve and the carrier duct.

2. The AIS of claim 1 , wherein the filter airflow change device is movable relative to the inlet barrier filter.

3. The AIS of claim 2 , wherein the filter airflow change device is a filter door.

4. The AIS of claim 3 , wherein the filter door is configured to slide relative to the inlet barrier filter.

5. The AIS of claim 1 , wherein the tubular slide valve is movable along a curved path to selectively provide a closed airflow path from the inlet duct to the engine intake duct.

6. An aircraft, comprising:
an engine comprising an engine compressor intake;
a plenum;
an inlet barrier filter associated with the plenum, through which air can selectively enter the plenum;
an inlet duct associated with the plenum, through which air can selectively enter the plenum;
a bypass door associated with the inlet duct, the bypass door being configured to selectively change an amount of air allowed to pass through the inlet duct and to the engine compressor intake; and
a filter airflow change device configured to change an amount of airflow allowed through the inlet barrier filter and to the engine compressor intake;
wherein the filter airflow change device comprises a tubular slide valve and a carrier duct and wherein the slide valve is configured to receive at least a portion of a tubular portion of the carrier duct;
wherein when the tubular slide valve is fully extended relative to the carrier duct, airflow from the inlet duct to an engine intake duct via the inlet barrier filter is substantially reduced and airflow to the engine intake duct via the inlet duct is substantially increased; and
wherein movement of the tubular slide valve relative to the carrier duct changes an amount of longitudinal overlap between the tubular slide valve and the carrier duct.

7. The aircraft of claim 6 , wherein the filter airflow change device is movable relative to the inlet barrier filter.

8. The aircraft of claim 7 , wherein the filter airflow change device is a filter door.

9. The aircraft of claim 8 , wherein the filter door is configured to slide relative to the inlet barrier filter.

10. The aircraft of claim 6 , wherein the tubular slide valve is movable along a curved path to selectively provide a closed airflow path from the inlet duct to an engine intake duct.

11. A method of operating an aircraft, comprising:
selectively providing a first airflow path between an inlet duct and an engine compressor intake;
selectively providing a second airflow path between an inlet barrier filter and the engine compressor intake; and
operating a filter airflow change device configured to change an amount of airflow allowed through the inlet barrier filter;
wherein the filter airflow change device comprises a tubular slide valve and a carrier duct and wherein operating the slide valve comprises changing an amount of a tubular portion of the carrier duct received within the slide valve;
fully extending the tubular slide valve relative to the carrier duct so that airflow from the inlet duct to an engine intake duct via the inlet barrier filter is substantially reduced and airflow to the engine intake duct via the inlet duct is substantially increased; and
wherein movement of the tubular slide valve relative to the carrier duct changes an amount of longitudinal overlap between the tubular slide valve and the carrier duct.

12. The method of claim 11 , further comprising:
reducing airflow through the first airflow path and increasing airflow through the second airflow path.

13. The method of claim 11 , further comprising:
increasing airflow through the first airflow path and reducing airflow through the second airflow path.

14. The method of claim 11 , further comprising:
moving the tubular slide valve along a curved path.

Assignees

• Bell Helicopter Textron Inc
• Textron Innovations Inc

Inventors

• Parsons Thomas Dewey
• Haynes David
• Miller David L
• Henson Bradley Robert

Classifications

• B64D2033/0246

  comprising particle separators · CPC title

• F02C7/055

  with intake grids, screens or guards · CPC title

• F05D2220/323

  for aircraft propulsion, e.g. jet engines · CPC title

• B64D33/02 Primary

  of combustion air intakes · CPC title

• F05D2260/606

  Bypassing the fluid · CPC title