DE20300436U1 - Protective sheathing, for electrical wires and pipes in vehicles, comprises corrugated pipe with textile layer and external metal layer - Google Patents

Abstract

Protective sheathing comprises corrugated pipe (1) that accommodates the length of wire(s) or pipe(s). Outside this, a textile layer (3) and an external metal layer (5) complete protection. The textile layer is adhered to the corrugated pipe using adhesive points (4) or areas between them. The adhesive is spiraled onto the corrugations. The metal layer is a foil, wound-on spirally with overlap. Several layers may be formed in this way.

Description

01091G
Verta AG
Marketplace 4

CH-9004 St. Gallen

Protective device for elongated objects

The invention relates to a protective device for elongated objects and in particular to a protective device for electrical lines, fluid lines and the like in motor vehicles according to the preamble of claim 1.

From WO 01/84685 A1, a heat protection device for elongated bodies exposed to heat from the outside in zones, e.g. for lines in a motor vehicle, is known, which has at least a first inner heat-resistant protective layer facing the body and a means for dissipating the heat occurring in zones and distributing it over a large area.

WO 99/04194 discloses a heat-protective element for protecting elongated objects, the element comprising a first layer of insulating material with an outer reflective layer. Opposite edges of the first element have elements for joining it in overlap to form a tubular element. A second insulating sheet is arranged on the outer surface inside the edges. The second sheet also has a reflective layer on its outer surface and is attached to the first sheet or layer along the edges, thereby forming air pockets between the sheets. A stiff monofilament wire, which is in spiral form, is arranged within this air pocket to further ensure the pocket-like structure. In this

The disadvantage of this known device is that it is very complex to manufacture and easily loses its shape under mechanical stress.

WO 98/30830 discloses an insulating device for insulating heat-generating components such as exhaust gas recirculation lines, which comprises an outer layer made of knitted glass fiber yarn. A metal wire skeleton is present to give the layer a tubular shape, with a further layer of heat-insulating mineral paper being present, which is separated from the cover layer by the metal wires. A disadvantage of this device is that it is particularly complex to manufacture.

WO 97/29316 discloses an insulating layer for thermal insulation of tubular heat sources, in which knitted separating layers are present, between which a metallic foil is arranged, which is separated from a heat source by a knitted layer. The overall structure of this layer consists of a foil which lies against the heat source, on top of which is an inner knitted stainless steel fiber layer, on top of which is a fireproof paper, a second knitted layer made of a stainless steel fiber and on top of that a cover layer. This complex production is also a disadvantage in this embodiment.

It is known to cover elongated or extended bodies, e.g. electrical lines or fluid lines, such as hydraulic or pneumatic lines or pneumatic hoses, with corrugated plastic pipes, for example, to protect them from mechanical and/or thermal influences, in particular to protect them from heat and abrasion and to prevent chafing. It is also known to protect such elongated bodies accordingly to protect them from damage in the event of an accident to the vehicle, in particular damage caused by crushing or shearing.

Conventional corrugated pipes are made of polypropene or polyamide and have only limited thermal load capacity, so that electrical cables, hoses or the like, which are laid in vehicles near heat sources, e.g. near the engine, a turbocharger, an exhaust system, exhaust gas recirculation lines or the like, are not adequately protected from damaging heat by such corrugated pipes.

To solve this problem, it is known to use high-temperature-resistant corrugated pipes, e.g. made of Teflon, or to make the insulation of the conductor wires high-temperature-resistant, e.g. made of a silicone or Teflon material. However, such high-temperature-resistant cable insulation is very expensive. It is also known to make glass silk hoses with a silicone coating.

It is also known to arrange corrugated pipes made of polytetrafluoroethylene in areas around cable harnesses that are exposed to heat. However, the disadvantage here is that these polytetrafluoroethylene corrugated pipes can only withstand long-term temperatures up to around 260 ⁰ C, with the melting point being 310 ⁰ C, so that accumulated heat, which is often above 300 ⁰ C, cannot be tolerated.

It is also known to cover glass silk hoses with aluminum foil in order to improve the thermal resistance of the glass silk hoses. However, it has been found that if the aluminum foil on the glass silk hoses becomes dirty, as is common in engine compartments, the thermal insulation no longer exists and heat is introduced into the glass silk hoses at certain points, which leads to undesirable heat transfer in this area to the object to be protected.

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Glass silk hoses coated in this way or the coating itself are very susceptible to damage when subjected to friction.

The object of the invention is to provide a protective device for elongated objects which, while being highly stable and impact-resistant, has sufficient thermal insulation and which also has sufficient abrasion resistance.
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The object is achieved with a protective device for elongated objects having the features of claim 1.

Advantageous further developments are set out in subclaims.

According to the invention, a corrugated pipe is braided or knitted with a glass silk hose or covered with such a glass silk hose, the glass silk hose being partially connected to the corrugated pipe, for example by means of an adhesive. An aluminum layer, in particular an aluminum foil lamination, is applied to the outside of the glass silk hose. It has surprisingly been found that the advantages of the corrugated pipe, namely flexural rigidity, low tendency to bend and high impact strength, are fully retained, while very good thermal insulation or very good thermal protection of the corrugated pipe is achieved. Furthermore, the arrangement according to the invention achieves a high level of abrasion protection, with the outer aluminum layer, which is sensitive in itself, also withstanding friction loads excellently. It was also surprisingly found that even if the aluminum layer becomes dirty, the corrugated pipe is not negatively affected. This is attributed to a thermal interaction of the aluminum foil with the

glass silk hose on the one hand and an air cushion formed by the corrugated tube on the other hand.

Compared to a glass silk tube that has been laminated with aluminum, the arrangement according to the invention is able to achieve a temperature reduction from the outside to the inside that is approximately 40-50% higher than with known protective devices. This heat insulation or shielding performance is so high that in areas exposed to heat, the use of electrical cables with temperature-resistant insulation is not necessary and instead of these cables, commercially available cables insulated with PVC can be used.

Another advantage is that the individual components of the protective device are inexpensive and can be put together in a simple, quick and safe way.

The invention is explained by way of example with reference to a drawing. The single figure shows a protective device according to the invention for elongated objects in a longitudinal section.

The protective device according to the invention for elongated objects comprises an elongated cylindrical corrugated tube 1. Such corrugated tubes 1 are provided with constrictions 2 at regular intervals in such a way that a ribbed structure of radial ribs is formed from the outside along a longitudinal direction. The corrugated tube 1 consists for example of polypropene, polyamide-6, polytetrafluoroethylene (PTFE) or other plastics, possibly also metals such as aluminum. The corrugated tube 1 serves to accommodate the elongated object and in particular electrical lines, fluid lines and the like in motor vehicles.

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A textile layer 3 is arranged on the outside around the corrugated pipe 1. The textile layer 3 consists of a braided, knitted, woven, or mat-shaped and/or strip-shaped textile laid around the corrugated pipe 1. In particular, of a knitted or braided glass silk. In order to fix the textile layer 3 to the corrugated pipe 1, adhesive, in particular in the form of adhesive dots 4, can be present on the corrugated pipe 1 at regular or irregular intervals. The distance between the adhesive dots 4 can be selected such that the textile layer 3 between the adhesive dots 4 is able to reduce tensions applied from the outside to change position. The textile layer 3 preferably consists of a knitted glass silk. Furthermore, polyester, polyamide, aramids and other possible fibers can also be used instead of glass silk. Furthermore, both monofilaments and multifilaments can be used, with a tolerable maximum temperature of 400 ^° C being aimed for. When using glass silk, a variety of glass types can be used, but so-called E-glass is preferred.

According to the invention, the textile layer 3 can also be conditioned with impregnations of any kind, for example with silicone oil or the like. In addition, the fibers forming the textile layer 3 can be individually provided with coatings, for example to reduce friction, to increase reflectivity or surface quality or the like. In particular, the fibers can be formed with a metal vapor deposition.

Furthermore, the protective device according to the invention for elongated objects comprises an outer layer 5 made of a metal foil on the outside. In principle, any metallic foil material can be used as the material for the metal foil. It is also possible to use a laminate foil made of several metal layers, possibly even different metals.

when increased reflection behavior is required. The outer layer 5 is preferably made of aluminum foil, in particular an aluminum foil with a high-gloss outer side, the thickness of which is 20μπα-30μηι, for example.
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The outer layer 5 is particularly preferably designed as a metal-coated, in particular aluminum-coated PET film, which has a particularly high abrasion and tear resistance. In this embodiment, the metal-coated layer is arranged facing outwards.

In order to apply the braid or the textile layer 3 to the corrugated pipe 1, the corrugated pipe 1 can be continuously knitted with the textile layer 3 in a corresponding circular knitting machine, with a prior application of adhesive to the corrugated pipe 2 in a point or area manner, so that the knitted material is glued to the corrugated pipe 2. The textile layer 3 is then wrapped with the film, whereby depending on the gradient when wrapping with the film, different overlap widths of the film on the layer below can be achieved, up to a multi-layer film layer.

It is also possible to pull a textile hose onto the corrugated pipe 2 and, for example, to fix them together at the ends.

Furthermore, instead of a foil, one or more metal layers can be vapor-deposited onto the textile layer.
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Claims (17)

1. Protective device for elongated objects, in particular protective device for electrical lines, fluid lines and the like in motor vehicles, characterized by
a corrugated tube ( 1 ) for receiving the elongated object,
a textile layer ( 3 ) arranged on the outside of the corrugated pipe ( 1 ) and a metal layer ( 5 ) arranged radially outside the textile layer ( 3 ). 2. Device according to claim 1, characterized in that the corrugated pipe ( 1 ) is made of a polyamide and/or polyolefin and/or polyester and/or aramid and/or other plastics and/or plastic laminates and/or reinforced plastics or plastic laminates and/or metal. 3. Device according to claim 1 and/or 2, characterized in that the textile layer ( 3 ) is a braided, knitted, nonwoven or woven tube. 4. Device according to one or more of the preceding claims, characterized in that the textile layer ( 3 ) is made of a glass silk, a polyester filament, a polyamide filament, a Teflon or aramid filament. 5. Device according to one or more of the preceding claims, characterized in that the textile layer ( 3 ) is formed from a monofilament or multifilament. 6. Device according to one or more of the preceding claims, characterized in that the textile layer ( 3 ) is glued to the corrugated pipe ( 1 ). 7. Device according to one or more of the preceding claims, characterized in that adhesive points or adhesive surfaces are present between the corrugated tube and the textile layer for adhering the textile layer ( 3 ) to the corrugated tube ( 1 ). 8. Device according to one or more of the preceding claims, characterized in that the adhesive is present in a helical or spiral shape on the surface of the corrugated pipe ( 1 ). 9. Device according to one or more of the preceding claims, characterized in that the filament forming the textile layer ( 3 ) is a coated and/or sheathed filament. 10. Device according to one or more of the preceding claims, characterized in that the filament is coated and/or encased with a plastic, a wax, a liquid, an oil or a metal. 11. Device according to one or more of the preceding claims, characterized in that the filament is vapor-coated with a metal. 12. Device according to one or more of the preceding claims, characterized in that the outer metal layer (5) is formed from metal foil webs which are wound in a helical or spiral manner onto the textile layer ( 3 ). 13. Device according to one or more of the preceding claims, characterized in that the film webs are wound up with an overlap. 14. Device according to one or more of the preceding claims, characterized in that the film webs are wound onto the textile layer ( 3 ) in such a way that a two- or multi-layer structure of the metal foil is formed by the overlap. 15. Device according to one or more of the preceding claims, characterized in that the metal foil is formed in multiple layers from superimposed foils of one or more metals. 16. Device according to one or more of the preceding claims, characterized in that the outer metal layer ( 5 ) is formed from one or more metal vapor deposition and/or electroplated metal layers, which are arranged in particular on a carrier material. 17. Device according to one or more of the preceding claims, characterized in that the outer layer ( 5 ) is designed as a metal-, in particular aluminum-, vapor-deposited PET film.