DE102013103113A1 - Media line with radial elevations or depressions - Google Patents

Abstract

The invention relates to a media line (1), in particular a plastic tube (1) or an elastomer hose (1), which has at least one partial area, with a plurality of radial elevations (11) and or or radial depressions (12), which are formed in the Level surfaces (13) of the surface (10) of the media line (1) are connected. The media line (1) is characterized in that the spacing surfaces (13) form diagonally continuous sections of the surface (10) and that the radial elevations (11) and / or radial depressions (12) are diamond-shaped.

Description

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 the case of media conduits such as plastic pipes (for example made of polymers) and hoses made of elastomeric material, to increase their flexibility, in particular flexibility, by means of so-called wave profiles, ie. 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 outer wall of the media line is formed. 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 with axial symmetry with respect to the longitudinal axis and can thus equally easily bend in all directions and lengthen in the longitudinal direction. However, if preferred directions of flexibility are to be provided and longitudinal elongation reduced, then circumferentially discontinuous wavy profiles are known, e.g. by radially opposing flats. Such media conduits can be bent relatively well over the axis of the shaft members, such as complete corrugation profiles, but exhibit stiffness such as shaftless media conduits when bent over the axis of the flats. In this way, a bending axis and a perpendicular thereto 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, plastic or elastomeric media conduits are manufactured by corrugator extrusion or blow molding or suction molding processes which can be used to economically produce only continuous conduit shapes, 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, connect the adjacent surveys together and thus selectively counteract the flexibility generated by the wave profiles again, i. acting as stiffeners in the longitudinal direction, which reduce both the flexibility over the axis of the stiffeners and the longitudinal elongation 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. be provided offset by 90 ° in the circumferential direction 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 are, for example 1a to 3c of the EP 1 295 062 B1 or the 1 and 2 of the EP 0 702 182 A1 refer to. 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 are to be used. This restricts the possibilities of variation in particular in 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 rearward engagement of the formed 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. However, such gradients are increasingly required especially with the increasing use of media lines in the engine of vehicles, ie the media lines used must be able to bend three-dimensionally for mounting. Also such shaped media lines must withstand the stresses in the engine compartment such as vibrations and heat permanently. In this case, the media lines are exposed, for example, when used for the transport of coolant temperatures up to 130 ° C, for example, and must be able to retain their shape permanently under these conditions, ie have the lowest possible thermal expansion. Also need Elastomeric hoses partially withstand high pressures without increasing their diameter.

The US 2012/0085454 A1 relates to a pipe of a refrigeration cycle of a vehicle, which can be manufactured 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 polygon elevations and flat surfaces alternate in the longitudinal direction.

The EP 1 267 112 A1 relates to a pressurized fluid line that can withstand up to 150 ° C at least 60 MPa pressure. 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 spaced from each other in the plane of the tube surface by surfaces 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 can be reduced by flats and webs only in the region of these stiffening elements. Also, by the increasing internal pressure, deformations and movements of bent corrugated conduits, which are also highly undesirable to cause 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 by the features of the characterizing part of claim 1. Advantageous developments are described in the subclaims.

Thus, the present invention relates to a media line, in particular a plastic tube or an elastomer tube, which has at least a portion having a plurality of radial projections and / 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 advantages achieved according to the invention can be used, i. on all types of media-carrying pipes 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, the base edges lie in the plane of the surface and extend on several sides, at least three sides, radially outward or inward from the plane of the surface of the media line and in a tip off pointy, 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-like surface structure 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, ie a significant elongation of the media line can be prevented in the longitudinal direction can. This structure can also be regarded as a longitudinal 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.

Further, the radial protrusions cause an increase in the flexibility of the media conduit, in all directions, so that it acts 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 that the design of the web width, i. the distances between the diamond-shaped elevation or depression, the previously described properties of the media line can be influenced. Large distances between the diamond-shaped elevation or depression, i. 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 comparatively flexible, i. flexible media management; a flat (obtuse) angle accordingly causes a stiffer, i. less flexible media management. If the diamonds are formed radially outwardly formed as surveys, lower flow losses occur 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 have many applications due to their improved properties. As a result, it is possible to dispense with individual cases and cover several applications with the same products, which reduces the manufacturing costs, in particular by reducing the variety of tools.

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

In a four-sided pyramidal element, two opposite edges extend in the circumferential direction and the two edges arranged at right angles thereto extend 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 the material thickness is achieved by the greater transformation of the material in the outer area, 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 an area may, for example, be completely free of any wave profiles and the like, ie represent a smooth line. In this way, the diamonds according to the invention can be provided in areas of the media line, in which the corresponding properties described above, such as flow properties and bending radius gradients are to be used, and the remaining areas of the media line to be free of diamonds and the like, since their properties are not needed there or be desired. As a result, the production costs can be reduced, since smooth line areas can be made simpler and less expensive than line sections with profiles.

• – Extrudieren eines zylindrischen Grundkörpers, und
• – Ausbilden von radialen rautenförmigen Erhebungen und bzw. oder Vertiefungen, die durch diagonal durchgängige Abschnitte in der Ebene der Oberfläche der Medienleitung voneinander beabstandet sind.

The present invention further relates to a method for producing a media line as described above, preferably a corrugator or Saugblasextrustionsverfahren, comprising 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 easy 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 depressions, which by diagonally continuous portions in the plane of the surface of the media line from each other are spaced.

Such a form of manufacture may e.g. be formed shell-shaped, so that two joined such manufacturing forms form a cylindrically closed split manufacturing mold in which a medium line according to the invention, for. can be formed 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 explained below in connection with the following figures. It shows:

1 a perspective schematic representation of a media line according to the invention according to a first embodiment;

2 a schematic plan view of a media line according to the first embodiment;

3 a perspective schematic detail B of 1 ;

4 a perspective schematic detail of the C 1 ;

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

6 a schematic sectional view through a single collection of a media line according to the first embodiment;

7 a perspective schematic representation of a media line according to the invention according to a second embodiment;

8th a schematic plan view of a media line according to the second embodiment;

9 a perspective schematic detail B of 7 ;

10 a perspective schematic detail of the C 7 ;

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

12 a schematic sectional view through a single collection of a media line according to the second embodiment;

13 a perspective view of surveys according to a third embodiment; and

14 a perspective view of surveys according to a fourth embodiment.

1 shows a perspective schematic representation of a media line according to the invention 1 according to a first embodiment; 2 a corresponding schematic plan view. The media management 1 can be a plastic pipe 1 or an elastomeric hose 1 be. The media management 1 extends in the direction of a longitudinal axis A and has at least one layer or layer of an at least plastics-containing or elastomer-containing material. The outer layer of the media line 1 forms on the outside the outer surface 10 or surface 10 the media management 1 , On this are, to the ends of the media line 1 spaced, according to the first embodiment, a plurality of surveys 11 arranged; the ends of the media line 1 are free from surveys 11 , These are called quadrilateral polygons 11 , Pyramids 11 or diamonds 11 formed extend in the radial direction R and each with a dome 14 from. The four sides of the rhombuses 11 are preferably formed the same area. The dome 14 the rhombus 11 can be rounded or flat.

At the foot of the rhombuses 11 These sit with diagonal straight edges on the surface 10 on. The diamonds 11 are so on the surface 10 arranged that they are in the circumferential direction and in the longitudinal direction A with their tips in the plane of the surface 10 lie opposite. Here are all diamonds 11 to each other on the surface 10 through spacer surfaces 13 spaced. These clearance surfaces 13 are on the surface 10 formed as a continuous diagonal sections or areas that can transmit tensile and compressive forces in the longitudinal direction A throughout.

3 shows a perspective schematic detail B of 1 and 4 a perspective schematic detail of the C 1 , In these two representations are the four equal sides of the rhombus 11 as well as the distance surfaces 13 to be seen in detail. 5 shows a schematic side view (top), ie viewed in the circumferential direction, and schematic plan view (bottom) on a single survey 11 a media line 1 according to the first embodiment. 6 shows a schematic sectional view through a single survey 11 a media line 1 according to the first embodiment, ie viewed in the longitudinal direction A.

The 7 to 12 show representations and views of a second embodiment of a media line according to the invention 1 , Here, instead of diamond-shaped elevations 11 corresponding depressions 12 used.

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

14 shows a perspective view of surveys 11 according to a fourth embodiment. These surveys 11 have a substantially parallel to the surface 10 the media management 1 trained and extending in the longitudinal direction A web 15 on. The jetty 15 is flat in this embodiment, but it can also be formed sharp-edged. The geometry of the rest of the survey 11 is designed so that in the circumferential direction in each case a triangular surface at the two edges of the web 15 connects, each with two more surfaces in the distance surfaces 13 pass.

LIST OF REFERENCE NUMBERS

A

Longitudinal axis, longitudinal direction

B

Detail view single survey 11 or recess 12

C

Detail view Part of the media line 1

R

Radius, radial direction perpendicular to the longitudinal axis A.

1

Media line, plastic pipe, elastomer hose

10

External surface of the media line 1 , Surface

11

diamond-shaped elevations of the surface 10

12

Diamond-shaped depressions of the surface 10

13

Spacing areas between elevations 11 or between depressions 12

14

Top of a hill 11 or recess 12

15

Footbridge of a survey 11 or recess 12

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 1295062 B1 [0006]
• EP 0702182 A1 [0006]
• US 2012/0085454 A1 [0008]
• EP 1267112 A1 [0009]

Claims (8)

Media line ( 1 ), in particular plastic pipe ( 1 ) or elastomer hose ( 1 ) comprising at least a portion, comprising: a plurality of radial protrusions ( 11 ) and / or radial depressions ( 12 ), which pass through in the plane of the surface ( 10 ) of the media line ( 1 ) extending spacer surfaces ( 13 ), characterized in that the spacer surfaces ( 13 ) diagonally continuous sections of the surface ( 10 ) and that the radial elevations ( 11 ) and / or radial depressions ( 12 ) are diamond-shaped. Media line ( 1 ) according to claim 1, wherein the radial elevations ( 11 ) and / or radial depressions ( 12 ) are formed on four sides rhombic. Media line ( 1 ) according to claim 1 or 2, wherein the radial elevations ( 11 ) and / or radial depressions ( 12 ) a rounded dome ( 14 ) exhibit. Media line ( 1 ) according to claim 1 or 2, wherein the radial elevations ( 11 ) and / or radial depressions ( 12 ) a flat formed dome ( 14 ) substantially parallel to the surface ( 10 ) is trained. Media line ( 1 ) according to claim 1 or 2, wherein the radial elevations ( 11 ) and / or radial depressions ( 12 ) one substantially parallel to the surface ( 10 ) and extending in the longitudinal direction (A) web ( 15 ) exhibit. Media line ( 1 ) according to one of the preceding claims, wherein the media line ( 1 ) has at least one subregion which is free of radial elevations ( 11 ) and / or radial depressions ( 12 ). Method for producing a media line ( 1 ) according to one of the preceding claims, preferably corrugator or Saugblasextrustionsverfahren, comprising at least the steps of: extruding a cylindrical base body, and forming radial diamond-shaped elevations ( 11 ) and / or depressions ( 12 ) passing through diagonally continuous sections ( 13 ) in the plane of the surface ( 10 ) of the media line ( 1 ) are spaced from each other. A manufacturing method for a method according to claim 7, wherein the production mold is at most half the circumference of a medium pipe ( 1 ) and a plurality of radial diamond-shaped elevations ( 11 ) and / or depressions ( 12 ) passing through diagonally continuous sections ( 13 ) in the plane of the surface ( 10 ) of the media line ( 1 ) are spaced from each other.

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