# US 2009/0260706 A1 · Pipeline For Conducting Air For Air Conditioning In Aircrafts

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- Number: US 2009/0260706 A1
- Document ID: US20090260706A1
- Status: Published application
- Kind: A1
- Application number: 11/914,177
- Filed: 2006-05-15
- Published: 2009-10-22
- Earliest claimed: 2005-05-13
- Assignees: Airbus Deutschland GmbH
- Inventors: Karsten Hesse; Heinz-Peter Busch; Hans-Jurgen Schelling
- Web page: https://patentgrep.com/patent/US20090260706A1

## CPC

- F24F 13/0209: {characterised by their connecting means, e.g. flanges}
- B64D 13/00: Arrangements or adaptations of air-treatment apparatus for aircraft crew or passengers, or freight space
- F16L 11/042: {formed by bending a sheet and connecting the edges}
- Y02T 50/40: Weight reduction
- Y02T 50/50: On board measures aiming to increase energy efficiency
- 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
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

The invention relates to a pipeline 1, 34 for conducting air, in particular in a temperature range between −55° C. and +85° C. and at a differential pressure load of at most ±500 hPa relative to cabin pressure, for air conditioning in aircrafts. According to the invention, the pipeline 1, 34 is formed with a foamed plastics material and/or with a dense plastics material, one outer face 9, 36 of the pipeline and/or one inner face 17 of the pipeline comprising a wrapping 6, 37 with at least one linear reinforcing element, in particular with resin-impregnated carbon fibers or glass fibers for reinforcement, at least in certain sections. Owing to the winding 6, 37 provided for reinforcement, at least in certain sections, on the outer face 9, 36 of the pipeline and/or the inner face 17 of the pipeline, the pipeline 1, 34 can be optimally adapted to different load requirements along the section for laying, resulting in a potentially considerable reduction in weight. In particular the flexural strength or buckling strength of the pipeline 1, 34 may vary in certain sections and thus reduces the weight. Furthermore, the use of a foamed plastics material in particular for forming the pipeline 1, 34 allows a further weight reduction as the rolled-up, panel-like foamed plastics material assumes a dual function in the form of conduction of air and thermal insulation. Without the thermal insulation requirement, the pipeline 1, 34 can also be formed with a dense plastics material, for example with a thin plastic film. The pipeline 1, 34 according to the invention can also be seamlessly formed by extrusion methods.

## Claims

### Claim 1

Pipeline (1, 34) for conducting air, in particular in a temperature range between −55° C. and +85° C. and at a differential pressure load of at most ±500 hPa relative to cabin pressure, for air conditioning in aircrafts, wherein the pipeline (1, 34) is formed with foamed plastics material and/or with a dense plastics material, one outer face (9, 36) of the pipeline and/or one inner face (17) of the pipeline comprising a wrapping (6, 37) with at least one linear reinforcing element for reinforcement, characterized in that
the wrapping (6, 37) for reinforcing the pipeline (1, 34) is formed with a plurality of layers (10, 12), the layers (10, 12) having a plurality of windings (11, 13) each wound in the same direction,
layers(10, 12) located one above the other comprise windings(11, 13) wound in opposite directions to form a net-like structure of the wrapping (6, 37),
a spacing (14) between the windings (11, 13) and/or an angle of slope (15) between the windings (11, 13) and a pipeline longitudinal axis (16) varies/vary in certain sections to change the winding density as a function of local mechanical load requirements of the pipeline (1, 34),
the linear reinforcing elements for forming the windings (11, 13) are formed with at least one continuous fiber (7, 8, 38, 39) which is enclosed by a matrix made of a thermosetting plastics material and/or a matrix made of a thermoplastic polymer.

### Claim 2 (depends on 1)

Pipeline (1, 34) according to claim 1, characterized in that, to minimize flow losses, the inner face (17) of the pipeline is constructed so as to be substantially smooth.

### Claim 3 (depends on 1)

Pipeline (1, 34) according to claim 1, characterized in that the pipeline (1, 34) is formed with at least one rolled-up portion of material (2, 19, 35) of the foamed plastics material and/or the dense plastics material.

### Claim 4 (depends on 1)

Pipeline (1, 34) according to claim 1, characterized in that in each case two of the mutually abutting longitudinal sides (4, 5, 21, 22) of the rolled-up portion of portions of material (2, 19, 35) are constructed so they can be joined together by means of a connecting element (16) in order to form the pipeline (1, 34).

### Claim 5 (depends on 1)

Pipeline (1, 34) according to claim 1, characterized in that, for forming the pipeline (1, 34), the respectively abutting longitudinal sides (4, 5, 21, 22) of the rolled-up portion or portions of material (2, 19) are constructed so they can be securely joined together, in particular can be glued or welded to each other.

### Claim 6 (depends on 1)

Pipeline (1, 34) according to claim 1, characterized in that the pipeline (1, 34) is seamlessly formed with at least one strand of the foamed plastics material and/or of the dense plastics material.

### Claim 7 (depends on 1)

Pipeline (1, 34) according to claim 1, characterized in that the inner face (17) of the pipeline and/or the outer face (9, 36) of the pipeline comprise (s) an additional sealing layer to improve the air tightness.

### Claim 8 (depends on 1)

Pipeline (1, 34) according to claim 1, characterized in that the portion or portions of material (35) and the strand or strands of material for forming the pipeline (1, 34), which are formed with the foamed plastics material, have a thickness dependent on a predetermined heat transfer coefficient.

### Claim 9 (depends on 1)

Pipeline (1, 34) according to claim 1, characterized in that the portion. or portions of material (2, 35) and the strand or strands of material for forming the pipeline, which are formed with the dense plastics material, have a thickness of less than 0.5 mm.

### Claim 10 (depends on 1)

Pipeline (1, 34) according to claim 1, characterized in that the foamed plastics material is a thermosetting plastics material and/or a thermoplastic polymer, in particular a polyimide foam or a polyethylene foam.

### Claim 11

Pipeline (1, 34) according to claim. 1, characterized in that the dense plastics material is a thermosetting plastics material and/or a thermoplastic polymer, in particular a film made of polyvinylidene fluoride (PVDF) or of other high temperature-resistant materials.

### Claim 12 (depends on 1)

Pipeline (1, 34) according to claim 1, characterized in that the dense plastics material has fiber reinforcement.

### Claim 13

Pipeline (1, 34) for conducting air, in particular in a temperature range between −55° C. and +85° C. and at a differential pressure load of at most ±500 hPa relative to cabin pressure, for air conditioning in aircrafts, wherein an outer face (9, 36) of the pipeline or an inner face (17) of the pipeline is provided with a wrapping (6, 37) for reinforcing the pipeline (1, 34) which comprises a plurality of layers (10, 12) wherein each layer (10, 12) has a plurality of windings (11, 13) formed by at least one continuous fiber (7, 8, 38, 39) and wound in the same direction, and wherein the windings (11, 13) of the layers (10, 12) located one above the other are wound in opposite directions to form a net-like structure of the wrapping (6, 37),
characterized in that the pipeline (1, 34) is formed with a foamed plastics material or with a dense plastics material, the continuous fibers (7, 8, 38, 39) for forming the windings (11, 13) of the layers (10, 12) are enclosed by a matrix made of a thermosetting plastics material or a matrix made of a thermoplastic polymer and
a spacing (14) between the windings (11, 13) or an angle of slope (15) between the windings (11, 13) and a pipeline longitudinal axis (16) varies along the pipeline longitudinal axis (16) to change the winding density along the pipeline longitudinal axis (16) as a function of local mechanical load requirements of the pipeline (1, 34).