WO2014060135A1

WO2014060135A1 - Media line with radial elevations and/or depressions

Info

Publication number: WO2014060135A1
Application number: PCT/EP2013/067100
Authority: WO
Inventors: Florian KUHLHOFF
Original assignee: Contitech Mgw Gmbh
Priority date: 2012-10-15
Filing date: 2013-08-16
Publication date: 2014-04-24
Also published as: DE102013103113A1

Abstract

The present invention relates to a media line (1), in particular plastic pipe (1) or elastomer hose (1), which has at least one sub-region with a multiplicity of radial elevations (11) and/or radial depressions (12) which are connected by clearances (13) running in the plane of the surface (10) of the media line (1). The media line (1) is characterized in that the clearances (13) form diagonally continuous sections of the surface (10) and in that the radial elevations (11) and/or radial depressions (12) are of rhomboidal form.

Description

description

Media line with radial elevations or depressions

The invention relates to a media line, in particular a plastic pipe or an elastomer hose, according to the preamble of claim 1 and a method for producing such a media line and a manufacturing method for such a method.

It has long been known in media conduits such as plastic pipes (e.g.

Polymers) and hoses made of elastomeric material to increase their flexibility, in particular flexibility, by so-called wave profiles, i. circumferentially encircling, annular elevations and depressions in the longitudinal direction juxtaposed to provide alternately, so that in the longitudinal direction a wavy contour of the

Outside wall of the media line is created. This wave profile may be formed sinusoidal or trapezoidal. In the bending of such corrugated conduits, the bumps and depressions in the interior of the bend are compressed and the radially opposed projections and depressions are simultaneously pulled apart in the longitudinal direction, i. the individual shaft elements are loaded during the bending to train or pressure, so that the bend can be performed much easier than smooth-walled media lines.

Such "pure" wave profiles are formed axially symmetrical with respect to the longitudinal axis and can thus equally easily bend in all directions and lengthwise in the longitudinal direction, however, if preferred directions of flexibility are to be created and

Longitudinal expansion can be reduced in the longitudinal direction, so circumferentially interrupted wave profiles are known, e.g. through each other radially opposite

Flats. Such media lines can be over the axis of the shaft elements Bending comparatively well like full wave profiles, but when flexed across the axis of the flats, exhibit stiffness such as shaftless media lines. In this way, a bending axis and a right angle arranged

Stiffness axis can be provided.

Such flattened corrugated conduits are thereby advantageously suitable for certain applications, but not as media conduits to be bent three-dimensionally, since for this purpose no corresponding course of the bending axis can be provided, i. the flats are always in the neutral bending process, which makes the imitation of three-dimensional bending curves very difficult. In particular, media lines made of plastic or elastomeric material by means of corrugator extrusion process or blow molding or suction molding are produced in which economically only continuous

Line shapes can be produced, i. a bending axis of a flattened corrugated line rotating about the longitudinal axis is difficult to manufacture and uneconomical to manufacture.

Also corrugated lines with webs in the longitudinal direction are known, the adjacent

Connect surveys together and so the generated by the wave profiles

Specifically counteract flexibility, i. E. acting as stiffeners in the longitudinal direction, both the flexibility over the axis of the stiffeners and the

Reduce longitudinal expansion in the longitudinal direction. In this case, the webs in the longitudinal direction one behind the other from collection to collection or e.g. per survey e.g. around 90 ° in

Provided circumferentially offset to achieve different gradients of flexibility. In this case, however, for reasons of production technology, the webs can be provided only at the locations of the corrugated profile, where e.g. Close the corrugator jaws and open or at the openings of Saugblasformen. This restricts the variation of the bridge arrangement.

Such sinusoidal corrugated lines, flattened corrugated lines and corrugated lines with webs in the longitudinal direction can be seen, for example, in FIGS. 1 a to 3 c of EP 1 295 062 B1 or FIGS. 1 and 2 of EP 0 702 182 A1. A disadvantage of all these wave profiles, that manufacturing technology only profiles with uniform, longitudinally arranged stiffening elements such as flats or webs can be provided if cost-effective and suitable for mass production corrugator extrusion, blowing or suction molding process to be used. This restricts the

Possible variations in particular by the fact that the webs on the longitudinal axis of the openings of the corrugator jaws and openings of the Saugblasformen must be provided in order to avoid undercuts the trained webs behind elements of the manufacturing forms. Such wave profiles provided with webs or flats are also not suitable for three-dimensional line courses, since they can not image neutral bending phases which have a three-dimensional course. Such courses, however, are increasingly required, especially with the increasing use of media lines in the engine of vehicles, i. The media lines used must bend three-dimensionally for installation. Also have such shaped media lines the

Loads in the engine compartment such as Withstand vibrations and heat permanently. The media lines are e.g. when used to convey coolant, temperatures to e.g. 130 ° C and under these conditions must be able to retain their shape permanently, i. have the least possible heat length expansion. Also, elastomeric tubing must withstand sometimes high pressures without increasing its diameter.

US 2012/0085454 AI relates to a pipe of a refrigeration cycle of a vehicle, which can be produced by means of an extrusion blow molding process. In order to increase the flexibility of the tube in its bending areas and simultaneously counteract the elongation, rings with convex, at least three-sided polygons are provided in the circumferential direction as flattened elevations, which are circumferentially spaced from each other by flat surfaces. In the longitudinal direction adjacent polygon rings are offset from one another in the circumferential direction in such a way that in the longitudinal direction

Alternate polygon elevations and flat surfaces. EP 1 267 112 A1 relates to a pressure-loaded fluid line which can withstand at least 60 MPa pressure at up to 150 ° C. This fluid conduit has at least one profile with a plurality of half shell-shaped elevations or triangular areas or corresponding depressions which are interconnected by a plurality of paths. The shell-shaped elements are in the plane of

Pipe surface by surfaces spaced from each other, resulting from the circular contour of the half-shell-shaped elements; the triangular surfaces are spaced apart by diagonal cuts in the plane of the tube surface. This tube surface geometry provides improved bending flexibility in all directions while avoiding elongation under pressure.

A disadvantage of all previously described waveguide profiles that they have a significant radial expansion under internal pressure, which is undesirable for many applications and flats and webs only in the area of this

Stiffening elements can be reduced. Also, by the rising

Internal pressure deformations and movements of curved corrugated lines are caused, which are also highly undesirable to e.g. in the engine compartment of a vehicle contact with e.g. to avoid heated engine components. A further disadvantage is that in the known waveguide profiles by the image on the inside of the media line there, the flow resistance for media is increased. In order to ensure a desired flow rate despite wave profile, then the diameter of the corrugated line is to increase, but this leads to increased space, increased weight and increased costs.

An object of the present invention is therefore to provide a media line of the type described above that overcomes the aforementioned disadvantages, or at least an alternative to the known waveguide profiles. The object is achieved according fiction, by the features of the characterizing part of claim 1. Advantageous developments are in the dependent claims

described. Thus, the present invention relates to a media line, in particular a

Plastic tube or an elastomer tube, which has at least a portion with a plurality of radial projections and or or radial

Depressions, which are connected by extending in the plane of the surface of the media line spacer surfaces. The media line is characterized in that the spacer surfaces form diagonally continuous sections of the surface and that the radial elevations and / or radial depressions are diamond-shaped.

By a media conduit is meant such a conduit which is suitable for directing or conveying media, i. to be flowed through by media. Media may include both liquid media, i. Fluids, as well as gaseous media.

In particular, such media lines are e.g. in vehicles in the engine compartment for transporting media such as liquids, e.g. Coolant, fuel, urea solution, or even air used. Under a line is to be understood a flexible tube, in particular with plastic, or a flexible hose, in particular with an elastomeric material. Overall, the present invention is applicable to all cylindrical or oval flexible hollow body in which the fiction, achieved according to the advantages can be used, i. on all types of media-carrying lines and

Hoses that need to absorb movements and forces in use. A diagonal course in the plane of the surface of the media conduit is to be understood as meaning a direction which has both a circumferential and a longitudinal component.

Under a diamond-shaped elevation or depression are polygonal or pyramidal elements to understand their basic edges lie in the plane of the surface and the multi-sided, at least three-sided, radially outward or inward extend from the plane of the surface of the media conduit and terminate in a pointed, flattened or rounded dome. The edges of the multi-sided diamond-shaped elements extend either in the circumferential direction and / or in the longitudinal direction, depending on the number and orientation of the edges.

The present invention is based on the finding that by means of such a grid-shaped surface structure, which is formed by the diagonally continuous portions of the surface of the media line, the tensile and compressive forces can be transmitted in the longitudinal direction, i. a significant elongation of the media line in the longitudinal direction can be prevented. This structure can also be regarded as a longitudinally directed support geometry, in which the radial elevations or depressions are embedded. At the same time, the support geometry counteracts a radial expansion of the media line, which is why it is more pressure-resistant than known corrugated lines. In particular, the heat resistance under pressure load is improved by the grid structure, since the grid structure absorbs the axial forces.

Furthermore, the radial elevations or depressions cause an increase in the

Flexibility of the media line, in all directions, so this

works three-dimensionally, i. the media line can be bent equally three-dimensionally over its entire length. In addition, the radial elevations or depressions increase the flow resistance of the inside of the media line significantly lower than other known wave profiles, which is why at the same

Flow rate inventive flexible media lines can be provided with a smaller diameter than previously known waveguides.

It is also advantageous here that the properties of the media line described above can be influenced via the configuration of the web width, ie the distances between the diamond-shaped elevation or depression. Large distances between the diamond-shaped elevation or depression, ie wide webs, cause a comparatively stiff media line with low elongation; small distances accordingly cause a large elongation. An acute angle of the diamond-shaped Elevation or depression causes a relatively flexible, ie flexible

Media line; a flat (obtuse) angle accordingly causes a stiffer, i. less flexible media management. Are the diamonds directed radially outward than

Elevations formed occur lower flow losses due to the lower flow resistance than inward diamonds, i. Wells. However, smaller bending radii are made possible by depressions than in elevations.

Also, the acoustic properties of the media line can be influenced by such rhombuses, since the structure of the media line in case of vibrations on its acoustically perceptible, emitted vibrations.

It is also advantageous that such media lines due to their improved

Properties have many uses. This can be up

Case-by-case solutions are dispensed with and several applications are covered with the same products, which reduces the manufacturing costs, in particular through the

Reduction of tool variety, reduced.

Preferably, the radial elevations and / or radial depressions are formed on four sides rhombic.

In a four-sided pyramidal element, two extend

opposite edges in the circumferential direction and the two edges arranged at right angles to each other opposite one another in the longitudinal direction. This four-sided diamond shape is advantageous because it allows loads of the media line to be accommodated both symmetrically to the circumferential direction and symmetrically to the longitudinal direction.

The radial elevations and / or radial depressions preferably have a rounded tip. This geometry reduces stress transfer during deformation. Furthermore, a homogeneous material flow with comparatively slight fluctuations in material thickness is thus achieved during production. Preferably, the radial elevations and / or radial depressions have a flat-shaped dome, which is formed substantially parallel to the surface.

This geometry achieves an improvement in the contact surface during production, in particular during thermoforming. The result is a smoother structure and thus better handling of the media line. At the same time, a reduction of

Material strength achieved by the greater deformation of the material in the outer region, i. The melt must continue into the depression or elevation. The radial elevations and / or radial depressions preferably have a web formed substantially parallel to the surface and extending in the longitudinal direction.

As a result, a changed elongation of the media tube is achieved due to the longitudinally aligned contour.

The media line preferably has at least one partial area that is free of radial elevations and / or radial depressions. Such a region may e.g. completely free from any wave profiles and the like, i. to represent a smooth line. In this way, the diamonds according to the invention can be provided in areas of the media conduit in which the corresponding properties described above, e.g. Flow properties and bending radius curves are to be used, and the remaining areas of the

Media line free of diamonds and the like, since their properties are not needed or desired there. This can also reduce production costs because smooth pipe sections can be made easier and cheaper than wire sections with profiles.

The present invention further relates to a process for the preparation of a

Media line as described above, preferably a corrugator or

Saugblasextrustionsverfahren, with at least the steps:

• Extruding a cylindrical body, and

• Forming radial diamond-shaped elevations and / or depressions, which are spaced from each other by diagonally continuous portions in the plane of the surface of the media line.

It is advantageous that such diamond geometries can be produced by known and inexpensive manufacturing processes such as injection molding, blow molding, suction molding or corrugator extrusion processes, i. by means of simple opening-closing movements of the molds. The diamond geometry of the media line depends on the number of radially distributed diamonds and must be adjusted depending on the wall thickness and diameter of the media line.

The present invention also relates to a production mold for such a method, wherein the production mold can mold at most half the circumference of a media line and a plurality of radial diamond-shaped elevations and or or

Wells which are spaced from each other by diagonally continuous portions in the plane of the surface of the media line. Such a production form can be designed, for example, in the shape of a half shell so that two such production forms form a cylindrically closed, divided production mold in which a media line according to the invention can be formed, for example, by means of a corrugator extrusion process. Also, three or more such molds may be used to form a cylindrically closed split mold, if the design of the lozenges requires such a layout and arrangement of the split molds in manufacturing engineering. Exemplary embodiments and further advantages of the invention are described below

Explained in connection with the following figures. 1 shows a perspective schematic representation of a fiction, contemporary

Media line according to a first embodiment;

Fig. 2 is a schematic plan view of a media line according to the first

embodiment;

FIG. 3 shows a perspective schematic detail B of FIG. 1; FIG.

FIG. 4 shows a perspective schematic detail C of FIG. 1; FIG.

Fig. 5 is a schematic side view (top) and schematic plan view (bottom) on a single survey of a media line according to the first

embodiment;

Fig. 6 is a schematic sectional view through a single survey of a

Media line according to the first embodiment;

Fig. 7 is a perspective schematic view of a fiction, contemporary

Media line according to a second embodiment;

Fig. 8 is a schematic plan view of a media line according to the second

embodiment;

FIG. 9 shows a perspective schematic detail B of FIG. 7; FIG.

FIG. 10 shows a perspective schematic detail C of FIG. 7; FIG.

11 is a schematic side view (top) and schematic plan view (bottom) of a single well of a media line according to the second

embodiment;

Fig. 12 is a schematic sectional view through a single elevation of a

Media line according to the second embodiment;

Fig. 13 is a perspective view of surveys according to a third

embodiment; and

Fig. 14 is a perspective view of surveys according to a fourth

Embodiment. 1 shows a perspective schematic illustration of a media line 1 according to the invention in accordance with a first embodiment; Fig. 2 is a corresponding schematic plan view. The media line 1 may be a plastic pipe 1 or a

Be elastomeric hose 1. The media line 1 extends in the direction of a longitudinal axis A and has at least one layer or layer of an at least plastic-containing or elastomer-containing material. The outer layer of the media line 1 forms on the outside the outer surface 10 or surface 10 of the media line 1. On this, spaced from the ends of the media line 1, according to the first embodiment, a plurality of elevations 11 are arranged; the ends of the media line 1 are free of elevations 11. These are formed as four-sided polygons 11, 11 pyramids or diamonds 11, extending in the radial direction R and each terminate with a dome 14 from. The four sides of the diamonds 11 are preferably formed on the same surface. The crest 14 of the rhombus 11 may be rounded or flat.

At the foot of the diamonds 11 these sit with diagonal straight edges on the surface 10. The diamonds 11 are arranged on the surface 10 so as to face each other in the circumferential direction and in the longitudinal direction A with their tips in the plane of the surface 10. In this case, all rhombuses 11 are spaced from each other on the surface 10 by spacer surfaces 13. These spacer surfaces 13 are formed on the surface 10 as a continuous diagonal sections or areas, the

can consistently transmit tensile and compressive forces in the longitudinal direction A.

FIG. 3 shows a perspective schematic detail B of FIG. 1 and FIG. 4 shows a perspective schematic detail C of FIG. 1. In these two

Representations, the four equal sides of the rhombus 11 and the spacer surfaces 13 can be seen in detail. Fig. 5 shows a schematic side view (top), ie viewed in the circumferential direction, and schematic plan view (bottom) on a single elevation 11 of a media line 1 according to the first embodiment. 6 shows a schematic sectional view through a single elevation 11 of a media line 1 according to the first embodiment, ie viewed in the longitudinal direction A. FIGS. 7 to 12 show representations and views of a second embodiment of a media line 1 according to the invention. In this case, corresponding recesses 12 are used instead of diamond-shaped elevations 11.

Fig. 13 shows a perspective view of elevations 11 according to a third embodiment. These elevations 11 have a rounded tip 14.

Fig. 14 shows a perspective view of elevations 11 according to a fourth embodiment. These elevations 11 have a substantially parallel to the surface 10 of the media line 1 and extending in the longitudinal direction A web 15. The web 15 is formed flat in this embodiment, but it can also be formed sharp-edged. The geometry of the remaining elevation 11 is formed so that in the circumferential direction in each case a triangular surface connects to the two edges of the web 15, each having two further surfaces in the

Pass over spacer surfaces 13.

LIST OF REFERENCE NUMBERS

(Part of the description)

A longitudinal axis, longitudinal direction

B detail view of individual elevation 11 or recess 12

C Detail view Subsection of the media line 1

R radius, radial direction perpendicular to the longitudinal axis A.

I media pipe, plastic pipe, elastomer hose

10 outer surface of the media line 1, surface

I I rhombic elevations of the surface 10

12 diamond-shaped depressions of the surface 10th

13 spacing surfaces between elevations 11 and between depressions 12th

14 summit of a survey 11 or recess 12

15 web of a survey 11 or recess 12th

Claims

claims

1. media line (1), in particular plastic pipe (1) or elastomer hose (1), which has at least one subregion, with:

a plurality of radial elevations (11) and / or radial depressions (12), which are connected by spacer surfaces (13) extending in the plane of the surface (10) of the media conduit (1),

characterized in that

the spacer surfaces (13) form diagonally continuous portions of the surface (10), and that

the radial elevations (11) and / or radial depressions (12) are diamond-shaped.

2. media line (1) according to claim 1, wherein the radial elevations (11) and / or radial recesses (12) are formed on four sides diamond-shaped.

3. media line (1) according to claim 1 or 2, wherein the radial elevations (11) and / or radial recesses (12) have a rounded tip (14).

4. media line (1) according to claim 1 or 2, wherein the radial elevations (11) and / or radial recesses (12) have a flat formed dome (14) which is formed substantially parallel to the surface (10).

5. media line (1) according to claim 1 or 2, wherein the radial elevations (11) and / or radial recesses (12) has a substantially parallel to the surface (10) formed and in the longitudinal direction (A) extending web (15).

6. media line (1) according to any one of the preceding claims, wherein the media line (1) has at least a portion which is free of radial elevations (11) and / or radial depressions (12).

7. A method for producing a media line (1) according to one of the preceding claims, preferably corrugator or Saugblasextrustionsverfahren, with at least the steps:

Extruding a cylindrical body, and

Forming radial diamond-shaped elevations (11) and / or depressions (12) which are spaced apart from one another by diagonally continuous sections (13) in the plane of the surface (10) of the media line (1).

8. A manufacturing method for a method according to claim 7, wherein the manufacturing mold can mold at most half the circumference of a media line (1) and a plurality of radial diamond-shaped elevations (11) and / or recesses (12) through diagonally continuous portions (13 ) in the level of

Surface (10) of the media line (1) are spaced apart.