# US 7,509,980 B2 · Ventilation tubing in particular for an airconditioning system

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- Number: US 7,509,980 B2
- Document ID: US7509980B2
- Status: Granted
- Kind: B2
- Application number: 10/697,566
- Filed: 2003-10-31
- Published: 2004-10-28
- Granted: 2009-03-31
- Earliest claimed: 2002-11-04
- Assignees: Espa
- Inventors: Manuel Nogueira; Patrick Dupont; Etienne Bruet
- Web page: https://patentgrep.com/patent/US7509980B2

## CPC

- F24F 13/0263: {Insulation for air ducts}
- B64D 13/00: Arrangements or adaptations of air-treatment apparatus for aircraft crew or passengers, or freight space
- F16L 11/125: {non-inflammable or heat-resistant hoses}
- F16L 59/153: for flexible pipes
- F24F 13/0281: {Multilayer duct}
- Y10T 428/1372: Randomly noninterengaged or randomly contacting fibers, filaments, particles, or flakes
- F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02)
- B64D: EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The present invention relates to ventilation tubing comprising, from the inside to the outside, a bush (1), an insulating layer (2) and a cover sheet (3). Said ventilation tubing is characterized in that the insulating layer is a quartz fiber wool of which the specific surface weight illustratively is between 65 and 140 g/m2. The bush (1) and/or the cover sheet (3) may be a plastic sheet exhibiting a weave of interlacing filaments. In particular the present invention applies to aircraft ventilation circuit tubings.

## Claims

### Claim 1

Ventilation tubing comprising, as seen from the inside to the outside, a bush, an insulating layer and a cover sheet characterized in that the insulating layer is a quartz-fiber wool, the thickness of said quartz fiber wool is between 6 and 15 mm and said quartz-fiber wool exhibiting a specific surface weight between 65 and 150 g/m2, wherein the bush (1) and the cover sheet (3) is a plastic sheet having a weave of interlaced filaments and wherein the specific surface weight of said plastic sheet is substantially between 30 and 65 g/m2 and its thickness is substantially between 10 and 15μ (microns).

### Claim 2 (depends on 1)

Ventilation tubing as claimed in claim 1, characterized in that the density of said quartz fiber wool is between 10 and 20 kg/m3.

### Claim 3 (depends on 1)

Ventilation tubing as claimed in claim 1, characterized in that it comprises a plastic winding (5, 6, 7) helically enclosing the bush and bonded to it by a flame-resistant adhesive.

### Claim 4 (depends on 1)

Ventilation tubing as claimed in claim 1, wherein a plastic winding (5, 6, 7) helically encloses the bush and is bonded to the bush by a flame-resistant adhesive, and the winding is a filament (6) of which the diameter is between 1 and 2 mm.

### Claim 5 (depends on 3)

Ventilation tubing as claimed in claim 3, characterized in that the winding (7) exhibits a specific cross-sectional geometry of which a substantially planar base (8, 11) makes contact with the bush.

### Claim 6 (depends on 5)

Ventilation tubing as claimed in claim 5, characterized in that said winding is an I-bar.

### Claim 7 (depends on 1)

Ventilation tubing as claimed in claim 1, characterized in that said quartz fiber wool exhibits a specific surface weight between 80 and 100 g/m2.

### Claim 8 (depends on 1)

Ventilation tubing as claimed in claim 1, characterized in that the thickness of said quartz fiber wool is between 8 and 11 mm.

### Claim 9 (depends on 1)

Ventilation tubing as claimed in claim 1, wherein the plastic sheet is a sheet of polyvinyl fluoride.

### Claim 10 (depends on 1)

Ventilation tubing as claimed in claim 1, wherein the weave of interlaced filaments is a grid of polyamide filaments.

### Claim 11 (depends on 9)

Ventilation tubing as claimed in claim 9, wherein the weave of interlaced filaments is a grid of polyamide filaments.

### Claim 12

Ventilation tubing comprising, as seen from the inside to the outside, a bush, an insulating layer and a cover sheet characterized in that the insulating layer is a quartz-fiber wool, wherein the bush (1) and the cover sheet (3) is a plastic sheet having a weave of interlaced filaments, characterized in that it comprises a plastic winding (5, 6, 7) helically enclosing the bush and bonded to it by a flame-resistant adhesive, and the winding (7) exhibits a specific cross-sectional geometry of which a substantially planar base (8, 11) makes contact with the bush.

### Claim 13 (depends on 12)

Ventilation tubing as claimed in claim 12, characterized in that said winding is an I-bar.