DE3153010C2 - High-pressure hose - Google Patents

Abstract

The invention concerns a high-pressure hose composed of a plastic core and at least two plies of helically wound pressure carriers between which there is disposed an interlayer of synthetic fibres of unrestricted length which mostly follow a certain direction, and optionally with an outer sheath, wherein the interlayer is constructed as a wound layer of synthetic-polymer yarn. In a preferred embodiment, the synthetic-polymer yarn is a polyester yarn spun from monofilaments.

Description

The invention relates to a high pressure hose according to the preamble of claim 1.

Such high-pressure hoses have a high degree of flexibility and flexibility with a certain degree of flexibility Elasticity is desirable even at high operating pressures To achieve this, several of the im the following listed manufacturing techniques are known.

DE-OS 28 54 570 describes a flexible composite hose of high bursting strength, which consists of a an inner tube consisting of a polymer thermoplastic, one or more surrounding the inner tube Reinforcement layers made of metal wire and one the reinforcement layer or reinforcement layers made of metal wire surrounding outer tube made of an elastomer :! Has thermoplastics.

The inner tube can be surrounded by at least two reinforcement layers made of metal wire, with an intermediate layer is provided between these reinforcement layers. This liner can match each other keep adjacent metal wire reinforcement layers separate from each other and allow the reinforcement layers to to move in the longitudinal direction relative to each other. According to another embodiment, the Metal wire wrapped around the inner tube in a spiral shape at least one of the reinforcement layers, wherein the material of the intermediate layer in the spaces between the turns of the reinforcement layer occurs from helically wound metal wires. This condition is due to vulcanization of the liner accessible. If necessary, the outdoor hose is connected to the wire reinforcement in a form-fitting manner.

DE-PS 11 88 388 relates to a hose made of vulcanizable Elastomers, with reinforcing inserts made of metal wires to improve their adhesion are treated on a binding layer made of vulcanizable elastomers, the binding layer an essential part the hose wall forms and is firmly connected to an outer and inner hose wall layer, wherein this hose uses the following known characteristics:

a) the metal wires are treated with a non-ferrous metal coating,

b) the binding layer contains additives of phenol-formaldehyde resins which are alcohol-soluble in the unvulcanized state and fillers that increase the metal-rubber bond.

So it is in the manufacture of high pressure resilient Hoses, especially those made of vulcanizable elastomers with braided or coiled ones Pressure carriers known to improve the adhesion between the outer core wall and the pressure carrier, as well as between the pressure carriers and between the pressure carriers and the outer hose, Apply vulcanizable adhesion promoter / adhesive. The binding layer that forms during vulcanization

ίο is part of the hose wall. Beside the advantage of better homogeneity and the resulting higher vibration resistance as well A good rubber-metal bond is achieved through the load-bearing capacity

DE-PS 20 14 887 describes a flexible high-pressure hose consisting of an extruded Inner layer made of a plastic with mechanical strength, which makes the inner layer thornless Carrying the other layers during and after their application enabled, still consisting of one first intermediate layer, a reinforcement layer, a second intermediate layer and a plastic outer layer wherein the intermediate layers are made of a natural or synthetic vulcanizable material exists and the outer layer has such a mechanical strength that it is during the vulcanization process the intermediate layers can absorb deformation forces. The in this DE-PS 20 14 887 thus see the use of vulcanizable hoses to improve flexibility Mixtures as intermediate layers.

DE-OS 22 03 399 relates to a method for producing a flexible high-pressure hose which consists of a high polymer and has a reinforcement, wherein for the production of the intermediate layer a non-woven fabric is used which is sufficiently soft to ensure that it is of a High polymer can be penetrated. The first reinforcement layer is applied before the second layer an intermediate layer consisting of a high polymer and textile fibers is applied, wherein this intermediate layer is connected in one piece.

DE-OS 22 23 523 describes a process for the production of hoses for high operating pressures are suitable, and from a plastic core and several layers of helically wound wires as Pressure carrier and optionally an outer jacket made of plastic material, the tube core hypothermic before winding up the first i) seam layer and the supercooling is repeated before each further wire layer is wound up. It is suggested, to use a tape made of a hotmelt adhesive film between the individual printing layers, which is but has not proven to be advantageous in mass production, since this film is in an additional operation must be activated by a heat treatment and thus incurs additional costs

The present invention is based on the object of providing a high-pressure hose of the type mentioned above , in which a substantial improvement in flexibility is achieved without vulcanization and without the use of adhesives, without having to accept disadvantages in terms of pressure resistance or impulse resistance at the same time.

This object is achieved with the means specified in the characterizing part of claim 1.

The structure of the hose is designed in such a way that a wire layer in a on the hose core

Direction is turned. This wire layer is followed by the
Intermediate layer made of plastic yarn. To this
The plastic yarn layer will then go opposite to that
Direction of the first wire layer, the second wire layer coiled. Depending on the requirements, the inner hose can also be wrapped in pairs with several wire layers. Then between the wire layers
each wrapped a layer of plastic thread. Finally, the hose with a general
made of thermoplastic material provided outer hose 10.

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Claims (2)

Patent claims: 1. High pressure hose consisting of a plastic core, an outer tube and at least two layers of helically wound print carrier made of steel wires with an intermediate layer of synthetic material wound between them, characterized in that the intermediate layer between each two coiled in opposite directions Reinforcement layers as an intermediate layer with a plastic yarn spun from single threads is constructed. 2. High pressure hose according to claim 1, characterized in that the plastic yarn has a starch from 200 to 750 dtex.