DE7514049U - THERMAL INSULATED AND CONSTANT CROSS SECTION HOSE - Google Patents

Description

Applicant: Carl Freudenberg, Weinheim

Heat-insulated and constant cross-section

hose

The invention relates to a flexible, thermally insulated Hose, especially for use in air conditioning, without any significant changes in cross-section Can be placed around tight radii, and which is stiffened by a spiral made of metal or plastic. Other important areas of application for such hoses are found in the promotion of flowable or free-flowing Goods.

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To achieve a balanced indoor climate in buildings, climatic chambers and motor vehicles, it is necessary to distribute the conditioned air in a targeted manner. The efficiency of such distribution systems is largely determined by the flow conditions in the Lines and the quality of the thermal insulation of these lines.

To produce such distribution systems are usually used in buildings that through special shaped pieces, such as e.g. Krümmeri, are connected to one another, and which are subsequently thermally insulated have to. The disadvantage is the erheoliche effort in the Assembly of such channels, since they have to be adapted to the local conditions as a rigid body, what e.g. different types of bends or fittings to be manufactured individually. As essential The disadvantage of metallic channels in particular is the propagation of sound waves through these channels or the direct transmission of structure-borne noise through the lines becomes apparent.

To be used for heating the passenger compartment of motor vehicles insulated ducts and hose lines are used for some makes. A typical one for such hose lines Embodiment consists of a foamed rubber surrounded by an NBR skin, which is sewn on by a Spiral is stiffened. Due to the complex manufacturing process, this version only has one Motor vehicles found limited distribution. Another use case can be found in the hoses that are used for the extraction of machines can be used, among other things. These hoses must remain dimensionally stable under negative pressure and insensitive to vibration and minor changes in position being.

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In wastewater engineering, there are also often difficulties with long pipes with insufficient inclines to be laid outdoors as there is a risk of freezing. The necessary heating of the drainage pipes is very expensive and can when using the Hose according to the invention can be saved in many cases because of its good thermal insulation.

The invention is based on the object of developing a structure-borne sound and heat-insulated flexible hose which, without any significant change in cross-section, around tight radii can be placed and remains dimensionally stable under overpressure and underpressure conditions; the hose should be able to be adapted to certain conditions in a simple manner during assembly while avoiding special fittings, and in a simple manner to be produced in different sizes.

The object is achieved according to the invention by a reinforced hose so that the inner and / or outer wall of the hose consists of a crosslinked or non-crosslinked, foamed thermoplastic material, in the a spiral made of metal or plastic is permanently embedded.

According to a special embodiment of the invention, it is also possible, for example, to completely remove the hose body to produce a closed-cell foamed, crosslinked polyolefin, in particular a foamed crosslinked one Polyethylene, in the inner and / or outer wall of which a metal or plastic spiral is anchored by welding is.

The welding process can also be carried out by induction or resistance heat on the outside of the hose Flaming, take place by means of exact dosing of the

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If the almost smooth surface of the hose is retained.

The mechanical strength and evenness of the surface can be improved by coating with an elastomer. Likewise, to avoid electrostatic charge and to improve the Ent flammverzögerunρ des Insulating tube the surfaces are provided with a coating. The insulating tube is resistant to negative pressure and can be poured into concrete. In addition, the closed-cell structure of the jacket enables it to be used in wet areas or for conveying liquids.

The hose according to the invention can be produced, for example, in the following way:

In a first process step, the spiral intended for the inner stiffening of the hose is made in a known manner made of metal wound on a rotating mandrel. Subsequently, the sheet blanks are turned into a mandrel wrapped in this way Slotted tube shaped, which can be done with the help of matrices, for example. The butt edges of this slotted tube are with thermoplastic hose bodies heated with a heating blade and butt welded, while with non-thermoplastic hose bodies, e.g. those made of foam rubber, the abutting edges are glued.

In the next process step, the spiral that has been firmly anchored on the winding mandrel up to this point in time is used solved. In doing so, it expands and attaches itself firmly to the inner wall of the hose body. Brief inductive heating above the melting point of the Thermoplastic penetrates the spiral into the surface of the hose and welds there.

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The upward spiral is applied analogously »where as A stiffening plastic band can also be used, which is then attached to the outer wall of the outer spiral Tube is glued.

In addition to such a discontinuous production, the known methods of industrial hose production are possible continuous production is also possible.

According to the invention, the hose body consists of a thermoplastic material that can withstand loads of up to approx. loo ° C or made of non-thermoplastic material that can withstand up to approx. 17o ° C can be loaded.

The group of thermoplastic materials includes, among other things, polyethylene foams, crosslinked and non-crosslinked, Polyvinyl chloride, polyurethane, and these have the advantage that they are immediate without additional adhesive weld with the metal spiral.

The group of non-thermoplastic materials includes all elastomer foams and sponge rubber. With these materials, a good connection between the hose body and the stiffening spiral can be achieved by applying thermoplastic adhesives to either the spiral or the contact surface of the hose using known methods. This can also be done, for example, in such a way that the contact surface of the hose is laminated with an adhesive fleece or an adhesive film with a thermoplastic adhesive component . A curable synthetic resin, such as phenolic resin and hexamethylenetetramine, can also be used for the coating for special temperature loads. The crosslinking temperature of the resin must be reached during the subsequent heating.

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According to the invention, internally arranged stiffening spirals are preferably made of metal, and external stiffening spirals are also made of plastic. she have depending on the application and hose diameter different slope. The profile of the helix can range from a circular cross-section to a Flat stretched tape can be varied, with a regular aim for a smooth surface of the finished tube will.

With an additional coating of the pre-reinforced Hose with a cold cross-linking elastomer, e.g. neoprene, which has been immersed or otherwise known methods can be applied, the flatness of the surface and the mechanical resistance of the hose wall can be improved. Besides the inner metal spiral is protected from corrosion by such a coating.

By dispersing antimony oxide, calcium carbonate or tricresyl phosphate in the still in solution Elastomer, the coating can at the same time receive flame-retardant properties from this process step.

Another task is achieved with the insulating hose according to the invention by a similar one to be applied Coating containing e.g. electrically conductive carbon black or metal powder is dissolved. Such a coating is electrically conductive. This creates an electrostatic charge and, on the other hand, the deposition of Dust in the lines largely restricted.

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Claims (1)

'File number n: ο 75 11; 0 * 19. 7th Protection claims : 1. Heat and buckle insulating hose for transport of gaseous, liquid or free-flowing media without any significant changes in cross-section Can be placed around tight radii and stiffened by a metal or plastic spiral is, characterized in that the inner and / or outer wall to be reinforced consists of a front or non-crosslinked, foamed thermoplastic material, in which a spiral made of metal or Plastic is inextricably embedded. 2. Heat and sound insulating hose according to claim 1, characterized in that the hose body consists entirely of a foamed, cross-linked polyethylene, in the interior and / or The spiral is inextricably embedded in the outer wall. 3. Heat and sound insulating hose according to claim 1, characterized in that the hose body consists of foam rubber, the surface of which on the side of the stiffening spiral with a Thermoplastic or coated with a hardenable resin or with a resin carrier in which the spiral is inextricably embedded. H. Heat and sound insulating hose according to claims 1-3, characterized in that the surface of the hose has an electrically conductive coating made of a thermoplastic above the stiffening element. -8th- HU ^ As 10/7/76 5. Heat and sound insulating hose according to claim l-lj, characterized in that the finished hose has inside and / or outside a coating made of an elastomer. 6. Heat and sound insulating hose according to claims 1-5 »characterized in that the finished Hose inside and / or outside a flame retardant has coating. 7514Π4Η 0 7.10.76