DE2014887C3 - Flexible high pressure hose - Google Patents

Description

The invention relates to a flexible high-pressure hose, consisting of an extruded inner layer made of a plastic, in particular made of polyamide, with a mechanical strength that allows the inner layer to carry the other without a thorn Enables layers during and after their application, furthermore consisting of a first intermediate layer, a reinforcement layer, and a second intermediate layer and a plastic outer layer.

In such a high-pressure hose known from French patent specification 1,373,863 exist Inner layer, outer layer and intermediate layers made of polyurethane, and as a result of the substantial The rigidity of these plastic layers is one such High-pressure hose not very flexible, which limits its use.

But if one or more layers consist of vulcanizable material - such a structure is known per se - then a casting mold for the outer layer and if necessary, an inner shape can also be provided; the greater flexibility of a hose with such layers must therefore be achieved with an increased manufacturing effort.

In contrast, the invention is based on the object, in the case of a hose, of the type mentioned at the beginning Kind while maintaining the thornless manufacture and wear resistance the overall flexibility to increase the elastomer layers with a simple manufacturing method; doing so is taking overall flexibility of the elastomer layers, the bending behavior of the hose with the same total thickness of the EIastoraer layers and the same reinforcement layer as with the known hose.

According to the invention, this object is achieved by S the joint application of the following features:

_a j ^ ₆ intermediate layers consist of a natural or synthetic vulcanizable material;

_b j _the outer layer has such a mechanical _{strength > that} ^ ₆ ^ ₆ J ^ j _1n vulcanization process of the intermediate layers can absorb deformation forces that occur.

According to advantageous developments of the invention

^l * * "" the first intermediate layer consists of a ^{G. emsch au} / ^ r basis of polychloroprene, and

^ώε , ^ ⁶¹ * Interlayer can be made from a mixture

insist on the basis of natural rubber

. ^Ο «^ f ^c ,! r ΛΛ ^era * «fish fort - ⁵ ^""f considerably. As with the well-known hose & ^bt . J ^ie l ™ "sctocht f *. Plastic has mechanical and corrosion resistance against the medium flowing through it, and the plastic outer layer is wear-resistant and corrosion-resistant against external atmospheres and media. The two intermediate layers made of vulcanizable material, on the other hand, result in a significantly better overall flexibility of the hose, especially since they significantly exceed the thickness of the usual adhesive layers for the fabric insert, and then they are also more flexible than pure adhesive layers. Therefore, on the other hand, a less flexible reinforcement layer made of steel wire mesh can be arranged without impairing the overall flexibility of the hose compared to the known hose consisting only of plastic layers with textile reinforcement, but with the advantage of higher compressive strength due to the steel wire mesh. A decisive advantage can be seen in the omission of an external vulcanization casting mold, which considerably simplifies the production.

The vulcanizable intermediate layers can

by extrusion, by helical winding and by channel-shaped arrangement of strips can be applied with and without longitudinal welding. the outer plastic layer can through Extrude or be produced from a layer of powder. The individual layers and the reinforcement are by any physical or chemical method, e.g. B. by adhesive or thermal Gluing, connected to each other.

The drawing shows an embodiment of the invention, and ^ w ar

Fig. 1 is a cross section and

F i g. 2 shows a longitudinal section through the high pressure hose.

The inner extruded layer 1 made of polyamide is vulcanizable with the first intermediate layer 2 Mixture, preferably based on polychloroprene, coated. The reinforcement mesh is on top of it 3 and above the second intermediate layer 4 is applied. The outer layer 5 is in In view of the strength of the plastic used, dimensioned so thick that it can be used as a mold during serve the vulcanization process and can thus withstand the deformation forces. The so educated Hose is wound onto a drum and vulcanized in an autoclave.

1 sheet of drawings

Claims (3)

Patent claims: I " 1. Flexible high-pressure hose, consisting of an extnidized inner layer made of a synthetic * itoff, especially made of polyamide, with a mechanical Strength, which enables the inner layer to carry the other layers without a dome during and after their application, furthermore consisting of a first intermediate layer, a reinforcement layer, a second intermediate layer and a plastic outer layer, characterized by the common application of the following features: a) the intermediate layers (7, 9) consist of a natural or synthetic vulcanizing resin material; ^y b) the outer layer (8) has such a mechanical strength that it when Vulcanization process of the intermediate layers (7, 9) occurring deformation ^ - can absorb forces. 2. Hochdnickschlauch according to claim 1, characterized characterized in that the first intermediate layer (7) consists of a vulcanizable mixture based on polychloroprene 3. High pressure hose according to claim 1 or 2, characterized in that the second Intermediate layer (9) made from a vulcanizable mixture based on natural rubber consists.