DE102016002103A1 - Multilayer heatable media line and ready-made media line with at least one such - Google Patents

Abstract

In the case of a multilayer heatable media line (2, 3) with a conduit wall (25, 35) and an inner conduit lumen (26, 36) for the passage of medium, in particular of a medium susceptible to freezing, the conduit wall (25, 35) of the media conduit (2, 3 ) consists of at least two material layers, the material layers comprise at least one inner layer (250) forming a permeation barrier and / or a crack formation, at least one second layer (251) providing mechanical strength and / or compressive strength on the at least one inner layer (250) ), at least one on the at least one second layer (251) arranged electrically conductive third layer (252, 253, 254) and at least one on the at least one electrically conductive third layer (252, 253, 254) arranged thermally and / or electrically insulating fourth layer (256).

Description

The invention relates to a multilayer heatable media line with a conduit wall and an inner conduit lumen for the passage of medium, in particular a gefriergefährdeten medium, the conduit wall of the media line consists of at least two layers of material, and a ready-made media line with at least one multilayer media line, in particular such a multilayer heatable media line , with a conduit wall and an inner conduit lumen for the passage of medium, in particular of a medium susceptible to freezing, and with at least one connection component arranged at the end on the media conduit.

Multilayer heatable media lines and ready-made media lines with at least one multilayer media line are known in the art. Under a multi-layer heatable media line in this case a media line, which is composed of several layers and which provides heating by heating elements and / or a heating layer or possibly also several heating layers, understood. By assembling a media line, the final stage is understood to mean the production of a ready-to-install media line, whereupon the media line is equipped with at least one connection component, such as coupling parts and / or line connectors, and can be installed, for example, in a motor vehicle. On the one hand, the connection parts can serve to connect a plurality of media lines or partial media lines, which are connected to form an entire media line, or to connect a media line to an aggregate or a connection device of an aggregate. The connection components can accordingly be designed in different forms, such as, for example, as a coupling section for receiving a plug part, as connection sections connectable or connected to the at least one media line via adhesive connections or welded connections, as mandrel section for thorns, in particular of hose lines etc.

In particular, in vehicles prefabricated heatable media lines are used for conducting liquid gefriergefährdeten media. The media flow through the inner line lumen of the respective media line. At low temperatures, the medium flowing through the assembled media line threatens to freeze, which is why it is known to provide heating of this and, if appropriate, of the connection components connected thereto. Under gefriergefährdeten media are understood here media that tend to freeze due to a relatively high freezing even at very high ambient temperatures, whereby the functionality of, for example, a vehicle affected or even significantly disturbed. This is especially evident in water-bearing media lines as well as in media lines, which are flowed through by an aqueous urea solution as a medium, such. B. AdBlue ^®, the case, which is used as NO _x -Reaktionsadditiv for diesel engines with so-called SCR catalyst (SCR = Selective Catalytic Reduction). It is therefore usually provided a heating possibility for the media line or at least parts of this and often also for the connection components in order to avoid freezing of the medium within the ready-made media line or to allow thawing of an already frozen medium.

In the arrangement of the ready-made media line in a vehicle, this can be connected, for example, at one end to an aggregate or a component, such as a metering unit in the region of a vehicle engine, and / or to a second prefabricated media line, on the other hand to a component or a another unit, such as a pump of a motor vehicle tank. The terminal components provided on the end of the assembled media line can be or will be adapted to the particular conditions of the connection points, that is, for example, to the conditions of a dosing unit and that of a pump. When arranging the one end of the assembled media line in the region of a metering unit of a vehicle engine and on the other hand in the pump of a vehicle tank, the ready-made media line is acted upon in sections with very different ambient temperatures, in the area of the vehicle engine or the exhaust line with very high temperatures, so this area as Hot area is called, and in the range, for example, a vehicle tank with possibly quite low or normal temperatures, which is why this area is referred to as a standard area or "cold area". The materials used for the respectively arranged there sub-media lines or individual media lines, which are or are assembled to the assembled media line, materials are therefore usually very different materials, on the one hand high temperature resistant materials and on the other hand standard materials. The individual media lines, which consist of different materials, in particular plastic materials, are connected to one another by connecting components, such as connectors made of plastic and / or metal, to the prefabricated media line, which subsequently extends both in the hot region and in the cold region of a vehicle. An example of this can be found in the DE 10 2010 053 737 A1 , According to this document The prior art discloses a heatable fluid line having at least one pipe and at least one extending over at least a portion of the pipe length electrical conductor, wherein the pipe has at least two longitudinal sections which are formed differently in terms of their material properties and / or their structural design. In this case, a first length section consists of a first material which contains a first polymer and a second length section of a second material which contains a second polymer, wherein the material of the second length section is more flexible and / or has a higher load-bearing capacity than the material of first length section. The pipe wall of the pipeline itself is constructed in two layers and comprises an outer wall consisting of a technical plastic, such as PA12, and an inner wall consisting of a fluoropolymer, such as PTFE, wherein the inner wall can be designed in the manner of a superficial coating of the outer wall and, accordingly, comparatively thin with a maximum wall thickness of for example 300 microns and the thicker outer wall ensures the required mechanical stability. Furthermore, it is disclosed that in the other length section, the pipeline is constructed in three layers, wherein the outer wall of a high performance plastic, such as filled PPA, the inner wall of a fluoropolymer, such as PTFE, and arranged between these two walls reinforcement is formed as a fabric layer of aramid.

For example, it is from the WO 2014/056628 A1 known to provide an electrically heatable media line with a pipe having at least two embedded in the wall electrical conductors and electrical feeders and with at least one connection contour. In this case, a basic pipe is wrapped and coated with an electrically conductive cover layer. The electrically conductive cover layer can also be the outermost layer of the pipeline. It is also possible to cover these outside with an electrical insulation layer, which subsequently forms the outermost layer of the pipeline.

From the DE 10 2010 051 550 A1 is a prefabricated electrically heatable media line with at least one pipe part with integrated electrically conductive device and with a connecting device, such as a plug, screw or coupling device, known, wherein for co-heating of the connecting device, the pipe part and the electrically conductive device to or until close to the pipe part facing away from the end of the connecting device or to close to, before or in a terminal contour. The pipe part is in particular formed as an electrically heatable multilayer plastic pipe and comprises three layers of a polyamide, wherein an inner layer, a middle layer and an outer layer are provided. In the middle layer, the conductors are provided for heating. The plastic material of the middle layer is filled with conductive components and has the electrically conductive conductors.

Furthermore, it is from the DE 10 2005 037 183 B4 known to provide a heatable fluid line with a pipe, at least one heating resistor and at least two electrical leads for the heating resistor. The tube has three layers, each made of plastic, wherein the middle layer is formed of an electrically conductive plastic. The radially inner layer and the outer layer are formed of an electrically insulating plastic. The two electrical leads are in electrical contact with the middle layer. The middle layer forms a heating resistor, wherein the two electrical leads are arranged within the layer.

Especially with the use of aggressive media, such as AdBlue ^® , even in the case of very low permeation of the aggressive media through the conduit wall of the media line, the contact conductors arranged in the latter can be damaged. Furthermore, it proves to be problematic that in media that tend to freeze even at higher ambient temperatures, such as AdBlue ^® , build up an ice pressure in the inner lumen of the media line and can lead to an increase in the volume within the inner tube lumen of the media line. For AdBlue ^® the volume increase is about 10%. Part of the increase in volume leads to an increase in the diameter of the media line, which is not only a radial expansion, but also to an axial extent, since the forming in the interior of the media line ice column over the longitudinal extent of the media line away up to this connected components to which it is connected. Precisely because of the radial expansion, there may be tearing or hairline cracks in the conduit wall and, accordingly, penetration of aggressive media into the interior of the conduit wall and possibly through it.

Another problem is that the extrusion process of the media conduit causes a texture in the longitudinal direction of the media conduit to occur through its withdrawal during the extrusion process. However, it has been shown that even slight impairment of the inner surface of the media line, such as very fine grooves or imperfections or inhomogeneities, a longitudinal cracking of the conduit wall can support. By providing an additional inner layer, this problem can possibly be prevented. However, at a high internal pressure, which may occur due to ice pressure, inside the media line, a maximum voltage at the inner diameter of the same.

The present invention is therefore based on the object to provide a multilayer heatable media line, in which cracking and crack propagation in the region of the conduit wall can be prevented as much as possible.

The object is achieved for a multi-layer heatable media line according to the preamble of claim 1, characterized in that the material layers at least one forming a permeation barrier and / or crack formation preventing or retarding inner layer, at least one arranged on the at least one inner layer, mechanical strength and / or compressive strength second layer imparting, at least one arranged on the at least one second layer electrically conductive third layer and at least one arranged on the at least one electrically conductive third layer thermally and / or electrically insulating fourth layer. For a ready-made media line according to the preamble of claim 15, the object is achieved in that the line wall of at least one multilayer media line consists of at least four material layers comprising at least one permeation barrier forming and / or crack formation preventing or retarding inner layer, at least one on the at least one inner layer arranged, mechanical strength and / or compressive strength-imparting second layer, at least one disposed on the at least one second layer electrically conductive third layer and at least one disposed on the at least one electrically conductive third layer thermally and / or electrically insulating fourth layer, and in that at least one of the connection components is connected in a material-locking manner to the second layer of the conduit wall which gives at least one mechanical strength and / or compressive strength, wherein the material of the connection component Is adapted to the material of this second layer of the conduit wall. Further developments of the invention are defined in the appended claims.

As a result, a multi-layered heatable media line and a ready-made media line are created with such a multilayer media line, in which cracking and crack propagation in the region of the conduit wall can be safely avoided due to the special multi-layered conduit wall structure. The inner layer exposed to the medium is designed such that on the one hand it forms a barrier layer against the permeation of the medium through the conduit wall and in particular this inner layer. Furthermore, it can prevent or delay cracking, wherein it advantageously has a corresponding extensibility, so that it can expand when there is a high internal pressure in the inner line lumen of the media line, in particular due to the ice pressure of the freezing medium inside the media line, since it is expansible , The maximum voltage is applied to the inner diameter of the conduit wall of the media line, ie at this inner layer of the conduit wall of the media line. This gives way to the building up high internal pressure in the inner lumen of the media line, without causing cracking of the inner layer. The second layer arranged radially above the inner layer or the at least one inner layer and imparting mechanical strength or compressive strength is not damaged by the internal pressure building up in the inner lumen of the media line, since the maximum second mechanical layer imparting this tension in the second layer is less than the voltage acting on the inner layer. Thus, there are no weak points on the inner diameter of the inner layer of the conduit wall of the media line free. On the contrary, the inner layer can expand in the inner lumen of the media line when an increased internal pressure occurs, without this affecting the at least one second layer arranged above it, which is intended to impart mechanical strength to the media line. Comparative tests with and without such an elastic inner layer show that 50% more freezing cycles can be overcome by providing the stretchable inner layer radially below the mechanical strength imparting second layer from the media line. Such cycles include, for example, cooling down to temperatures of -30 ° C to -40 ° C, a holding time at that temperature, thawing and heating to a temperature of 100-120 ° C followed by re-freezing.

The fact that at least one electrically conductive third layer is arranged radially above the at least one mechanical strength or compressive strength-imparting second layer, this is securely protected against contact with the medium flowing through the inner lumen of the media line. In particular, the contact conductors arranged in or on the third electrically conductive layer can be reliably protected from contact with the medium flowing through the inner lumen of the media line. By virtue of the fact that the mechanical stability-imparting second layer is arranged radially below the electrically conductive third layer, which may comprise one or more layers, there is a structure also not the risk of damaging this electrically conductive third layer in internal pressure building up in the inner lumen of the media line, for example by freezing medium there, since this pressure in the underlying two or at least two layers, the at least one inner layer and at least one second arranged above , Mechanical strength-imparting layer can be collected.

By providing the thermally and / or electrically insulating fourth layer radially above the electrically conductive third layer, an isolation from this to the outside is possible. In particular, when providing a thermally insulating fourth layer or a fourth layer, which is both thermally insulating and electrically insulating, it is possible to conduct heat in the direction of the inner lumen of the media line, which is generated in the region of the third electrically conductive layer, and thereby warm the medium flowing in the inner lumen. Heat generated in the at least one third layer of the conduit wall of the media conduit can be prevented from escaping outside into the environment by providing, in particular, the thermally insulating fourth layer at an exit from the conduit wall. In addition, at least one outer thermal insulation layer may be provided, which is arranged overlapping the fourth layer on the outside of the conduit wall. Additionally or alternatively, at least one cladding tube may be provided with insulating air volume trapped between the inside of the cladding tube and the outside of the insulating fourth layer of the conduit wall of the media conduit. The cladding tube may in particular be a corrugated tube or a smooth tube, it being particularly well possible to provide an air volume between it and the outside of the insulating fourth layer of the conduit wall when providing a corrugated tube in order to provide additional thermal insulation of the medium conduit to the outside.

Advantageously, the thermal conductivity of the outer thermal insulation layer or of the thermally insulating fourth layer of the conduit wall is lower than that of the further layers of the conduit wall of the media conduit in order to allow the desired thermal insulation.

At least one adhesion promoter layer may be arranged between at least two layers of the conduit wall of the media conduit, which is in particular thin, in any case thinner than the respective first to fourth layer of the conduit wall of the media conduit. As a result, the adherence of the at least four layers of the conduit wall to each other can be improved, depending on which materials are used for the individual layers and to what extent they can be connected or not connected to one another. The at least one adhesion promoter layer can assist adhesion of the respective adjacent layers to one another.

The conduit wall of the media conduit can have only one electrically conductive layer or, for example, two electrically conductive layers, wherein by providing at least two electrically conductive layers, complete embedding of contact conductors between them or in these is particularly well possible. Furthermore, it is possible to provide an electrically conductive layer and a non-electrically conductive, insulating cover layer, which also serves to insulate the electrically conductive layer. In order to effect the desired heatability, it is sufficient if the at least one contact conductor or the contact conductor only has contact with a surface of one of the electrically conductive layers. Of course, the contact conductor or conductors may also be completely embedded in the at least one electrically conductive layer.

The electrically conductive layer is advantageously made conductive by means of at least one electrically conductive additive, in particular by conductive carbon black, metal powder, graphite, nanoparticles, such as carbon nanotubes. Other electrically conductive additives may be provided for electrically conductive doping of the electrically conductive third layer. Also different electrically conductive additives can be introduced into this layer.

Advantageously, the electrically conductive third layer consists of a material of the same material class as the second, mechanical strength and / or compressive strength-imparting layer, over which the material of the electrically conductive third layer is arranged. In particular, the electrically conductive third layer can be made of conductively doped PA 12, while the second, mechanical strength and / or compressive strength-imparting layer consists of PA 12. Both layers, the second, mechanical strength and / or compressive strength-imparting layer and the electrically conductive third layer may thus consist of the same polymer material, wherein the electrically conductive third layer is doped corresponding conductive, that is set conductive with electrically conductive additive, such as already mentioned above.

The insulating fourth layer may consist of at least one foamed material for reducing the conductivity or may contain at least one foamed material. Especially by the provision of a foamed material, a particularly good insulation is possible.

It proves to be further advantageous if the material of the at least one inner layer of the conduit wall of the media conduit has a higher extensibility, in particular higher elongation at break, than the material of the second layer of the conduit wall of the media conduit arranged above the at least one inner layer. Since the second layer arranged radially above the first inner layer is intended to impart mechanical strength and / or compressive strength, this serves for the mechanical stability of the media line, so that it has advantageously only a low elongation, if any, and the interception of stresses which have increased Internal pressure in the inner lumen of the media line can occur, especially in freezing flowing medium, is absorbed by the stretchable inner layer, as already explained above. It proves to be particularly advantageous if the at least one inner layer of the conduit wall of the media conduit consists of ETFE to avoid cracking.

With further advantage, the material of the connection component belongs to the same material class as the material of the at least one material layer of the line wall to be connected or connected to the material of the connection component. This is advantageous, the at least a second mechanical strength and / or pressure-resistance-imparting layer, possibly in addition to the permeation of medium-preventing or cracking and crack propagation-preventing inner layer.

High temperature resistant, high temperature resistant materials suitable for hot range placement are those materials which permanently have temperatures greater than 140 ° C, especially greater than 160 ° C, and short term (maximum 10 min.) Greater than 180 ° C, this also several times over the life of the media line away. However, such material modification can be carried out for arranging in the hot region not only for the media line arranged there or the media line section of the assembled media line arranged there, but also for the connection component connected to the media line.

For example, as the material of a material class for the at least one mechanical strength and / or compressive strength-imparting second layer of the polyalkide (PPA) conduction wall and for the connectable to the at least one second layer terminal component glass fiber reinforced polyphthalamide (PPA-GF) can be used. Furthermore, it is possible, for example, to use polyamide-12 (PA12) for the at least one second layer of the line wall and glass-fiber-reinforced polyamide-12 (PA12-GF) for the connection component.

In the prefabricated media line according to the invention, the material of the connection component is advantageously adapted, in particular, to that of the second layer of the conduit wall of the media conduit. This creates a particularly good cohesive connection. The second, mechanical strength or compressive strength-imparting layer adjacent at least one inner layer and at least one electrically conductive, third layer are advantageously formed adapted for adhering to the second layer. Just by adjusting the materials of the connection component and the at least one second layer of the conduit wall of the media line to which the connection component is to be connected or connected to each other, a particularly good and dense and resilient cohesive connection can be created. In addition, intermediate layers may serve as adhesion promoter layers for assisting adhesion between the inner layer and the second layer as well as the second layer and the third layer and accordingly consist of a different material than the respectively adjacent layers of the conduit wall. The provision of an intermediate layer formed as an adhesion promoter layer is not required if, for example, the inner layer and / or the second layer or the second layer and / or the third layer has adhesion-promoting properties, eg. B. consists of a thermoplastic elastomer with adhesion promoter property. An adhesion promoter layer may, for. B. TPE adhesion promoter foam, this adjacent second layer of PA612 and the inner layer, which is adjacent to the conduit lumen and limited, made of ETFE.

High-temperature-resistant plastics which are suitable for a media line or partial media lines of a ready-made media line which can be used correspondingly in the hot region of a vehicle can be, for example, the material groups of a high-temperature-resistant polyamide (PA HT), fluoropolymers or fluoroplastics, thermoplastic elastomers (TPE) and high-temperature-resistant elastomers (elastomer HT) belong. Here, for example, the second, mechanical strength or compressive strength-imparting layer PA HT, for the third, electrically conductive layer conductive doped PA HT and for the inner layer of a fluoroplastic or PA HT for the second layer, for the third layer conductive doped PA HT and for the inner layer TPE or for the second layer of polyphenylene sulfide (PPS), for the third layer conductively doped PPS and for the inner layer either a fluoroplastic or TPE. Further, when using a high-temperature-resistant polyamide (PA HT) for the second and third layers, a high-temperature-resistant elastomer (HT elastomer) may be used for the inner layer. With a view to achieving high-temperature strength, it is also possible to use modified TPE, for example TPE-PEBA, instead of a standard thermoplastic elastomer, ie TPE with a polyamide as base. A section of the packaged media line that is only exposed to standard temperatures, ie not particularly high temperatures, may consist of materials that are standard materials for normal temperatures. In a second layer of the conduit wall of the medium line or partial media line of a normal temperature polyamide (PA "NT" or PA standard) and the third layer of appropriate material which is doped conductive, the inner layer of either a thermoplastic elastomer (TPE), a or more fluoroplastics or a normal temperature elastomer ("NT" elastomer).

As a material connection for connecting the connection component and the at least one second, mechanical strength and / or compressive strength-imparting layer of the conduit wall of the media line is in particular a welded connection, for example laser welding or friction welding. For friction welding, the inner layer and the second layer of the conduit wall z. B. received in a pocket-like recess of the connection component and advantageously at least the second layer, which is adapted with respect to their material to the material of the connection component, are joined by friction welding to the connection component cohesively. Accordingly, for the friction welding process, the connection component can be rotated relative to the media line, or conversely, the media line can be rotated relative to the connection component. Instead of friction welding or laser welding, it is also possible to provide another cohesive connection, such as injection molding, wherein the connection component is injection-molded onto or onto the second layer and possibly also against the inner layer.

Since the material of the inner layer of the conduit wall of the media line advantageously has a higher elasticity, in particular higher elongation at stretch, than the material of the outermost layer of the conduit wall, a particularly good elasticity of the media line can be achieved and unwanted damage even in freezing within the inner lumen of the media line Medium can be avoided very well, since the stretching of the inner layer causes the force occurring is forwarded to the at least one adjacent second layer, but there is no tearing of the layers of the conduit wall of the media line. Examples of materials that can be used for a stretchable inner layer are, for. As ETFE or TPE or PPA, which is not degraded advantageous at higher temperatures, thus can be used in the high temperature range. Thus, to avoid cracking, the inner layer may stretch while the second layer provides mechanical stability of the media line.

The second layer of the conduit wall of the media line is advantageously made of at least one of the media line mechanical strength-conferring material and has a yield strain or elastic elongation of z. B. 0.5-4%, in particular 1.3%. The material of the inner layer of the conduit wall of the media conduit advantageously has a 10-30% higher elasticity than that of the second layer of the conduit wall of the media conduit. In particular, the material of the inner layer of the conduit wall has a 20% higher stretchability than the second layer thereof and is in the range of 3-11%, in particular 5%.

By providing the different extensibility of the inner layer and the second layer of the conduit wall of the media line otherwise occurring in the prior art cracks in the conduit wall of the media line, especially in freezing medium within the media line or from its conduit lumen, resulting in an increase in volume and axial and / or radial rupture pressure, advantageously avoided. The pressure acting on the conduit wall by the freezing medium pressure can accordingly be absorbed by the very stretchable inner layer of the conduit wall of the media line.

The material layers of the at least one media line can be connected to one another. Alternatively, however, it may be provided to avoid a progression of a crack in the event of crack formation possibly occurring in one of the layers of the conduit wall of the media conduit, the layers at least substantially not connected to each other, in particular extruded over one another, form. The fact that the individual layers of the conduit wall are not interconnected, cracking in one of the layers does not lead to cracking in the other layers, since the individual Layers are decoupled from each other. This can, as mentioned, be done by the fact that the individual material layers of the conduit wall of the media line are extruded over each other, thus not (intimately) connected to each other.

Advantageously, the at least one inner layer has a layer thickness of 0.02 to 1 mm, the at least one second layer arranged above a layer thickness of 0.5 to 2 mm and the at least one third layer arranged above a layer thickness of 0.5 to 2 mm , The media line may also have dimensions of outside diameter and wind force of 4 x 1 to 1.2 mm or 5 x 1 to 1.5 mm or 6 x 1 to 1.5 mm or 8 x 1 to 2 mm or 10 x 1.5 to 2 mm or 12 × 1.5 to 3 mm. The respective details of the wall thickness relate to the total wall thickness of the conduit wall, comprising the at least four layers.

Especially for the use of the media line in the area of a vehicle, it proves to be advantageous to form the materials of the layers of the multilayer heatable media line high temperature resistant, in particular, the or part of the layers of PTFE, PPA, conductive doped PPA can exist. When arranging such a multilayer heatable media line in a vehicle, this can be connected, for example at one end to an aggregate or a component, such as a metering unit in the range of a vehicle engine, and on the other hand to a component or another unit, such as a pump a motor vehicle tank. In the area of the vehicle engine, during operation very high temperatures sometimes occur, as well as in the area of an exhaust gas line of the vehicle, while rather low or normal temperatures occur in the region of the vehicle tank. Temperature-resistant materials are therefore suitable in the region of the vehicle engine or of the exhaust gas line, while in the other areas the media line or its layers of standard materials which fulfill the respective functions of the individual layers of the multilayer media line discussed above can be used. For the inner layer, for example, is suitable as a standard material or non-temperature-resistant material TPE, in particular when a connection of the inner layer to a connector of a connection component to be provided. Furthermore, fluoropolymers can be advantageously provided with a particularly good permeation resistance, which are also suitable for the first or inner layer of the conduit wall of the media line. The electrically conductive layer can in the so-called. Cold area, ie in the area where no high temperature resistant materials are required, for example, consist of conductively doped PA12, while for the Hessbereich, ie the area in which prove high-temperature resistant materials, PPA as material for the electrically conductive layer, whereby this is doped conductive. Further, for the electroconductive layer as well as the mechanical strength imparting layer other than PPA, PA and PPS may also be used as materials. The materials of the second and third layer differ only by the electrically conductive doping of the third layer, ie the electrically conductive layer. By an optimal connection of the mechanical strength or compressive strength-imparting second layer to the electrically conductive third layer, the mechanical strength of the media line can be further supported. It proves to be particularly advantageous if the materials of the second and third layer belong to the same class of material or the material classes of the materials used for the second and third layer are similar to each other. When arranging the media line in a hot area, for example, a vehicle, ie in particular in the area of the vehicle engine or exhaust line, a high temperature resistant material is advantageously used for the second, mechanical strength or compressive strength layer, when arranging the media line in a normal tempered or Cold area in particular of a vehicle is a standard material.

For further explanation of the invention embodiments of this will be described in more detail below with reference to the drawings.

These show in:

1 3 shows a longitudinal section view in half section of a first embodiment of a media line according to the invention, comprising five layers, two of which layers are conductive layers,

2 3 shows a longitudinal section view as a half section of a second embodiment of a media line according to the invention, comprising four layers,

3 3 shows a longitudinal sectional view as a half section of a third embodiment of a media line according to the invention, comprising four layers,

4 3 shows a longitudinal section view as a half section of a bonded, laser-welded, connection according to the invention of a connection component and a media line according to the invention, wherein only sections are shown of both components,

5 3 shows a longitudinal sectional view as a half section of a material-fit connection according to the invention, friction-welded here, of a connection component and a media line according to the invention, only sections of both components being shown;

6 3 shows a longitudinal section view as a half section of an integral injection-molded connection according to the invention of a connection component and a media line according to the invention, wherein only sections are shown of both components,

7 a cross-sectional view of a media line according to the invention with inner material layer and outer material layer and with drawn voltage curve or strain profile.

8th a schematic diagram of a prepared according to the invention media line, connected on the one hand with a metering in the field of a vehicle engine and on the other hand, a pump of a vehicle tank.

In 1 is a section of a first embodiment of a media line 2 with an an inner lead lumen 26 surrounding pipe wall 25 shown. The conduit wall 25 comprises five layers of material arranged one above the other. Starting from the inner conduit lumen 26 radially outward becomes the inner conduit lumen 26 first from the inside of a first or inner layer 250 limited. This has a stretchability and therefore serves to prevent cracking or delay. Further, it serves as a permeation barrier for preventing passage of medium contained in the inner conduit lumen 26 flows through the conduit wall 25 through to the outside or through the inner layer 250 through to the other radially arranged above layers. Radially above the inner layer 250 arranged is a second layer 251 that gives mechanical strength and / or crush resistance. Radially above the second layer 251 is an electrically conductive layer 252 arranged, which is divided into two electrically conductive layers, in 1 With 253 and 254 designated. Within the second electrically conductive layer 254 in contact with the first electrically conductive layer 253 , attaching to their surface, are contact conductors 255 arranged. There can also be only one contact manager 255 be arranged. The contact manager (s) may contact an in 1 not shown to be connected to electrical feeders, which is a supply of electrical energy and thereby heating the contact conductor 255 and over this the electrically conductive layer 252 or the electrically conductive layers 253 . 254 enable.

Radially above the electrically conductive layer 252 is a fourth shift 256 arranged. The fourth shift 256 is formed thermally and / or electrically insulating and covers the electrically conductive layer 252 to the outside, so that it forms an insulating layer to the outside. Possibly. can the fourth shift 256 also be divided into two layers, one of which allows thermal insulation and the other an electrical insulation. When providing both, a thermal and an electrical insulation layer, it is particularly well possible in the electrically conductive, ie third, layer 252 generated heat inwards into the interior of the media line, thus into the inner conduit lumen 256 to direct and direct to heat the medium flowing therein and to prevent freezing of this or to cause thawing of frozen medium.

On the fourth layer 256 can, in particular, if this as an electrically insulating fourth layer 256 is formed, a thermal insulation layer 259 additionally be applied and cover these on the outside, as in 3 indicated. For thermal insulation, the media line 2 further from a cladding tube, such as a corrugated tube 260 to be surrounded, as in 1 indicated, between the inside of the cladding tube or corrugated tube and the outside of the fourth layer 256 an air gap 261 can remain, so that a thermal insulation can be achieved over the enclosed air volume.

Not shown, but for joining the individual layers 250 to 256 and possibly a covering thermal insulation layer, which in 1 is not shown, among themselves, hard-coat layers between each layer 250 . 251 respectively. 251 . 252 respectively. 251 . 253 respectively. 253 . 254 respectively. 253 / 254 and 256 be provided. This is also in 1 Not shown.

In the 2 shown embodiment of the media line 2 is different from the one in 1 shown in that the third electrically conductive layer 252 is not divided into two electrically conductive layers, but only such a layer 252 , which is electrically conductive, is provided. The Contact manager 255 are inside the electrically conductive layer 252 arranged, positioned on the surface 257 the second, mechanical strength and / or compressive strength having layer 251 , Here are the contact conductors 255 or the contact manager 255 in the preparation of the media line first on the surface of the second layer 251 positioned and subsequently the third electrically conductive layer 252 applied to it, in particular extruded thereon.

Another embodiment of a media line 2 is in 3 shown, again, similar to the embodiment according to 2 , only four layers 250 . 251 . 252 and 256 are provided, ie only an electrically conductive layer 252 as the third layer of the multilayer structure of the conduit wall 25 the media management 2 , In contrast to the embodiment according to 2 are the contact conductors or is the contact conductor 255 on the outside of the electrically conductive layer 252 , these on their surface 258 contacting, within the fourth, thermally and / or electrically insulating layer 256 arranged. Since the contact conductor or the contact conductor 255 on the surface 258 the electrically conductive layer 252 is arranged, this is thinner than the electrically conductive layer 252 in the embodiment according to 2 educated. In contrast, in comparison to the embodiment according to 2 the fourth, thermally and / or electrically insulating layer 256 in the embodiment according to 3 thicker, that is provided with a greater layer thickness, as the fourth, thermally and / or electrically insulating layer 256 according to 2 ,

The variants of the media line 2 or the layer structure of the respective line wall 25 from this to 1 and 2 is the according to 3 compared to preferred because in the embodiments according to 1 and 2 the contact conductor or the contact conductor 255 each better protected inside the conduit wall 25 the media management 2 is embedded. Because of the contact conductor (s) 255 heating of the inner conduit lumen 26 the media line flowing medium is to take place, arranging the contact conductor is closer to the inner line lumen particularly, so that the embodiments according to 1 and 2 opposite to the 3 to be favoured.

The media management 2 can be connected differently with a connection component, depending on its configuration of the connection component. For example, an end of the media line 2 aufgedornt, so be pushed over a mandrel profile to connect to the connection component, such as a line connector. Furthermore, adhesive bonding, overmolding, welding, etc. is possible to connect the media line to a terminal component. The media management 2 can also be inserted into a connector. Depending on the configuration, heating is not absolutely necessary in this case and could therefore be dispensed with.

The 4 . 5 and 6 show three different ways, connecting components 20 with the conduit wall 25 the media management 2 connect to. For connecting to the connection component 20 each does not serve the entire wall of the pipe 25 or the outermost or fourth layer 256 from this, but the second, mechanical strength and / or compressive strength-imparting layer 251 , In 4 is the variant of laser welding in the area of a laser welding point 10 indicated that a protruding edge area 27 of the connection component 20 with the second layer 251 the conduit wall 25 the media management 2 cohesively connects. The second layer 251 and the inner layer disposed radially below 250 the conduit wall 25 lie at the in 4 shown embodiment variant in a correspondingly provided paragraph area 28 the here stepped running circumferential wall of the connection component 20 , Outer side covered by the protruding edge region 27 of the connection component 20 , At least the above edge area 27 is accordingly laser-transparent to the desired laser welding between this projecting edge region 27 of the connection component 20 and the second layer 251 the conduit wall 25 the media management 2 to be able to make. The choice of material is thus suitably suitable for laser welding.

In the in 5 embodiment shown, a cohesive connection between the connection component 20 and the conduit wall 25 by friction welding, wherein at the end of the connection component 20 a circumferential groove or pocket 29 is provided, in which the second layer 251 and the inner layer disposed radially below 250 the conduit wall 25 the media management 2 are inserted. By rotating in particular the connection component 20 opposite the conduit wall 25 or the media management 2 , as in 5 indicated by the arrow P1, the friction welding between the connection component 20 and at least the second layer 251 the conduit wall 25 the media management 2 or at least the inner layer 250 the conduit wall 25 the media management 2 be generated. Both laser welding, as in 4 is suggested, as well as friction welding, as it is in 5 is hinted at Accordingly, the respective same material classes belonging materials are materially connected to each other, usually the second layer 251 with the material of the connection component 20 ,

In the in 6 embodiment shown is a cohesive injection-molded connection of connection component 20 and conduit wall 25 shown. Here is the connection component 20 injection-molded on the end of the media line 2 or on the second layer 251 and the front side, the inner layer 250 applied. As with the connection of connection component 20 and conduit wall 25 according to 4 becomes the layer 251 from the protruding edge area 27 of the connection component 20 covered, with the difference that at the in 6 variant shown instead of a (cohesive) laser welding a cohesive injection-molded connection between the edge region 27 and the second layer 251 is provided. The inner layer 250 the media management consists in the in 6 shown embodiment variant z. B. of ethylene-tetrafluoroethylene (ETFE).

By providing an end-stepped conduit wall 25 the media management 2 in which the two layers 251 and 250 each below the protruding edge region 27 or in the circumferential groove or in the circulating bag 29 are recorded while the other two layers 252 . 256 the conduit wall 25 the media management 2 based on the longitudinal extent of the media line 2 are formed shorter, the electrically conductive layer 252 with an at least small distance a to the connection component 20 be arranged as in the 4 to 6 shown. The contact conductors 255 , in particular copper conductors, are in the electrically conductive layer 252 protected, as well as the 4 to 6 can be seen.

In 7 is the voltage curve of the structuring second layer 251 shown. The under this as the first layer in the interior of the media line 2 arranged inner layer 250 is in turn designed to be stretchable, with a higher elasticity than the respective layers arranged above 251 . 252 . 256 , The second layer 251 gives the conduit wall 25 the media management 2 mechanical stability, while providing the stretchable inner layer 250 This causes only a force transfer to the second layer 251 takes place, but no cracking there, as only the inner layer 250 is stretched at this applied pressure. Such additional or possibly temporarily occurring and on the line wall 25 acting pressure may be due to freezing medium in the conduit lumen 26 or by axial and / or radial ice pressure on the conduit wall 25 occur. In 7 is a cross section of the media line 2 to see, with the voltage curve or the course of the strain σ over the second layer 251 the conduit wall 25 is drawn there. As can be seen, the stress or strain maximum lies in the region of the elastic inner layer 250 ,

The second layer 251 For example, it may have a stretch or elastic elongation of 0.5-4%, in particular 1.3%, while the extensibility of the inner layer 250 In contrast, for example, 10-30%, in particular 20% is greater and may be 3-11%, in particular 5%. The second layer 251 thus gives mechanical strength for the media line 2 while the stretchable inner layer 250 on the conduit wall 25 absorbs acting compressive force and prevents the formation of cracks in the conduit wall.

The second layer 251 and the inner layer 250 may be either interconnected or, more particularly, a crack propagation in one of the layers of the conduit wall 25 the media management 2 to prevent, not be interconnected. This can be done, for example, by overextruding the respective layer (s) 251 . 252 . 256 above the inner layer 250 the conduit wall 25 respectively.

The inner layer 250 For example, a layer thickness of 0.02 to 1 mm, the second layer arranged above 251 a layer thickness of 0.5 to 2 mm and the third layer disposed above 252 or according to 1 the third layer 253 have a layer thickness of 0.5 to 2 mm. The respective media management 2 or partial media line 2 . 3 can also dimensions of outside diameter of the media line and wall thickness of the conduit wall 25 . 35 from 4 × 1 to 1.2 mm or 5 × 1 to 1.5 mm or 6 × 1 to 1.5 mm or 8 × 1 to 2 mm or 10 × 1.5 to 2 mm or 12 × 1.5 to 3 mm.

8th shows a schematic diagram of a ready-made media line 1 comprising a first sub-media line 2 with the conduit wall 25 and the inner conduit lumen 26 and a second sub-media line 3 with a conduit wall 35 and an inner conduit lumen 36 , The two part media line 2 . 3 have connection components at their respective ends 20 . 21 respectively. 30 . 31 on, which can be designed as a connector. The connection component 21 the first part media line 2 is with the connection component 30 of the second part media line 3 connected. In particular, one of the two connection components is designed in the form of a plug part and the other in the form of a coupling part, which are inserted into one another.

The ready-made media line 1 is via the connection component 20 with a metering point 4 a vehicle engine 5 who in 8th is merely indicated, and on the connection component 31 with a pump 6 a vehicle tank 7 connected.

Both sub-media lines 2 . 3 are like the media management 2 to 7 trained and have the four layers 250 . 251 . 252 . 256 on, with the contact conductors 255 for heating the partial media lines 2 . 3 or at least a portion of them in the respective third, electrically conductive layer 252 are arranged. This is also in 8th indicated.

The materials of these individual layers may be different or similar, in each case adapted to the prevailing temperature range of the respective sub-media line 2 respectively. 3 in which this is arranged. The first part media line 2 is in the so-called hot area 8th arranged in which the ambient temperature of the assembled media line is relatively high due to the proximity to the vehicle engine 5 of the motor vehicle in which the assembled media line 1 is installed. In the so-called cold area 9 are, however, the second part media line 3 and also pump 6 and vehicle tank 7 arranged, being in this cold area 9 the ambient temperature is rather low, so that at low outside temperatures, especially in this area, a freezing of the medium flowing through the ready-made media line threatens.

As materials, for example, polyamides for the layers of the media line 2 or the two sub-media lines 2 . 3 be used. For example, PPA may be on the first sub-media line 2 in the hot area 8th and PA12 for the second sub-media line 3 or the associated with this connection components 30 . 31 because these are cold 9 are arranged to be selected. For the respective connection components 20 . 21 respectively. 30 . 31 For example, a glass fiber reinforced material of the same class of material can be used, that is, for the connection components 20 . 21 Accordingly, a PPA GF, so a glass fiber reinforced PPA, or for the connection components 30 . 31 a PA12-GF, thus a glass fiber reinforced PA12.

Examples of selectable materials for the respective layers 250 . 251 . 252 . 256 the two sub-media lines 2 . 3 are shown in Tables 1-3 below. Table 1 contains high-temperature-resistant materials that are suitable for the inner layer 250 and the second and third layers 251 . 252 (optionally consisting of the or at least the layers 253 . 254 ) in the hot area 8th arranged first part-media line 2 are suitable, while in Table 2 standard materials are listed, which are suitable for normal or standard temperature, for the respective inner layer 250 and the second and third layers 251 . 252 (optionally consisting of the or at least the layers 253 . 254 ) in the cold area 9 arranged second part-media line 3 , Tables 1 and 2 contain the respective material classes. Table 3 shows these individual material group members responsible for the structure of the respective material layers of the conduction walls 25 respectively. 35 the two sub-media lines 2 . 3 can be combined as desired.

If a tubular insulating device is provided for wrapping the media line and / or a thermal insulation layer as an additional outermost cover layer on the media line 2 applied or is, this may also be made of polyamide, for example, PA12.

By introducing conductive substances, those for the second layer 251 usable materials obtained conductivity and thereby for the electrically conductive third layer 252 can be used, such as by introducing Leitruß, metallic powder, graphite, or other conductive fillers, such as carbon nanotubes. The materials are thus for the second and the third layer 251 . 252 the same and therefore fit together to form an optimal connection of the two layers to each other. This allows the mechanical strength of the media line 2 . 3 or from the conduit wall 25 respectively. 35 get supported. Table 1: High temperature materials Electrically conductive layer with leifähiger doping Mechanical strength and / or compressive strength-imparting layer inner layer PA HT PA HT Fluoropolymers PA HT PA HT TPE PPS PPS Fluoropolymers PPS PPS TPE PA HT PA HT Elastomer HT PPA PPA ETFE Table 2: Standard temperature materials / standard materials Electrically conductive layer with leifähiger doping Mechanical strength and / or compressive strength-imparting layer inner layer PA "Standard" PA "Standard" TPE PA "Standard" PA "Standard" Fluoropolymers PA "Standard" PA "Standard" Elastomer NT PPA PPA ETFE Table 3: Material group PA HT (second and third layer) Material group fluoroplastics Material group TPE Material group Elastomer HT Material group PA NT (second and third layer) Material group Elastomer NT PPA ETFE TPU EPDM PA12 NBR PA66 FEP TPE-S FKM PA11 EPDM PA612 PFA TPE-V AEM PA1212 SBR PA610 PTFE TPE-A HNBR PA1012 CR PPS TPE-E Silicone SI PA6 HNBR F-TPV Fluorosilicone FVMQ IIR CSM FVMQ (F-silicone) SI (silicone) TPO acid copolymers ionomers EVA EnBA EMA

In terms of in the hot area 8th arranged, therefore consisting of high temperature resistant materials first part of the media line 2 Thus, the second and the third material layer can 251 . 252 made of high-temperature-resistant polyamide (PA HT), wherein the third layer 252 is doped conductive, while the inner layer 250 from a contrast stretchable material, such as a fluoroplastic, a thermoplastic elastomer (TPE) or a high temperature resistant elastomer (elastomer HT) may exist. Will for the second and third layer 251 . 252 however, a polyphenylene sulfide (PPS) may be used for the inner layer 250 a fluoroplastic or a thermoplastic elastomer may be used.

As can be seen from Table 2, for the second and third layer 251 . 252 the part-media line 3 For example, a normal temperature polyamide (PA "standard") can be used that with an inner layer 250 from a thermoplastic elastomer (TPE), fluoroplastics or normal temperature elastomer (elastomer NT) can be combined.

With regard to the material TPE it should also be noted that it can also be modified to be suitable for use at higher temperatures, accordingly for example for the inner layer 250 TPE-PEBA, ie a thermoplastic elastomer based on polyamide, can also be used.

As can further be seen from Table 3, high-temperature-resistant polyamide can be, for example, polyphthalamide (PPA), polyamide-66 (PA66), polyamide-12 (PA12), polyamide-612 (PA612), polyamide-610 (PA610) or also polyphenylene sulfide ( PPS). The material group of fluoroplastics includes according to Table 3 ethylene tetrafluoroethylene (ETFE), tetrafluoroethylene (FEP), perfluoroalkoxy polymers (PFA) and polytetrafluoroethylene (PTFE). The material group of the thermoplastic elastomers includes, as listed in Table 3, polyurethane elastomer (TPU), styrene block copolymers (TPE-S), olefin-based crosslinked thermoplastic elastomers (TPE-V), thermoplastic copolyamides (TPE-A), thermoplastic ones Copolyester (TPE-E) or a thermoplastic vulcanizate based on fluoropolymer (F-TPV). The group of high temperature solid elastomers for use as inner layer 250 comprises ethylene-propylene-diene rubber (EPDM), fluororubber (FKM), ethylene-acrylate rubber (AEM), hydrogenated nitrile rubbers (HNBR), silicone (SI) and fluorosilicone (FVQM) Silicone rubber with methyl, vinyl and fluorine groups on the polymer chain.

For the second and the third shift 251 . 252 the part-media line 3 can be used as normal temperature polyamides, for example, PA12, PA11, PA1212, PA1012 or PA6. Should be with such a second (and third) layer 251 Representative of the normal temperature elastomers for the inner layer 250 These may be combined, for example, nitrile-butadiene rubber (NDR), ethylene-propylene-diene rubber (EPDM), styrene-butadiene rubber (SBR), chlorobutadiene rubber (CR), hydrogenated nitrile rubber (HNBR), Butyl rubber (IIR), chlorosulfonated polyethylene (CSM), silicone rubber with methyl, vinyl and fluorine groups on the polymer chain (FVMQ), ie fluorosilicone, silicone (SI), TPE with ethylene propylene terpolymer base (TPE -O or TPO), acid copolymers, ionomers, ethylene-vinyl acetate (EVA), ethylene-n-butyl acetate (EnBA) or methyl acrylates (EMA). There is thus a wide choice, in particular with regard to the stretchable materials for the respective inner layer 250 the two media lines 2 . 3 , The respective ones for the second layers 251 and possibly also third layers 252 Suitable materials PA HT or PA NT or PPS are also advantageous for the connection components 20 . 21 respectively. 30 . 31 used to provide an adjustment to achieve an optimal cohesive connection here. The corresponding material for the connection components 20 . 21 respectively. 30 . 31 can in each case additionally modified, in particular glass fiber reinforced, be to provide even greater mechanical stability and rigidity in the field of connection components, which can be in particular connectors, so plug parts and coupling parts.

In addition to the embodiments described above and shown in the figures of multilayer heatable media lines and ready-made media lines with at least one such multilayer heatable media line, numerous other can be formed, in particular any combination of the features mentioned and variants in which the line wall of the multilayer heatable media line in each case comprises at least four layers of material, of which at least one inner layer as a cracking preventing or retarding or a permeation barrier forming, so a passage of medium preventing, material layer is formed, at least one arranged above second layer mechanical strength and / or compressive strength, at least a third layer disposed over the second layer is an electrically conductive layer and at least one over the electrically conductive dr Itten layer arranged as a thermally and / or electrically insulating material layer is formed. Connecting the conduit wall of the Media line with at least one connection component is in each case advantageously cohesively in the region of the at least one mechanical strength and / or compressive strength-imparting material layer, it also being possible for a cohesive connection to be provided with the inner layer of the conduit wall of the media line.

LIST OF REFERENCE NUMBERS

1

ready made media line

2

Media line / first part media line

3

second part media line

4

metering

5

vehicle engine

6

pump

7

vehicle tank

8th

hot region

9

cold area

10

Laser weld

20

connection component

21

connection component

25

channeling

26

line lumens

27

protruding border area

28

sales area

29

circumferential groove / pocket

30

connection component

31

connection component

35

channeling

36

line lumens

250

Inner layer / first layer

251

second layer

252

electrically conductive layer

253

first electrically conductive layer

254

second electrically conductive layer

255

Contact manager

256

fourth shift

257

Surface of 251

258

Surface of 252

259

thermal insulation layer

260

Corrugated tube / cladding tube

261

air gap

a

Distance between connection component 20 and conductive layer

P1

Arrow (rotating for friction welding)

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

• DE 102010053737 A1 [0004]
• WO 2014/056628 A1 [0005]
• DE 102010051550 A1 [0006]
• DE 102005037183 B4 [0007]

Claims (15)

Multilayer heatable media line ( 2 . 3 ) with line wall ( 25 . 35 ) and an inner conduit lumen ( 26 . 36 ) for the passage of medium, in particular a freeze-endangered medium, wherein the conduit wall ( 25 . 35 ) of the media line ( 2 . 3 ) consists of at least two material layers, characterized in that the material layers - at least one permeation barrier forming and / or crack formation preventing or retarding inner layer ( 250 ), - at least one on the at least one inner layer ( 250 ) arranged mechanical strength and / or compressive strength second layer ( 251 ), - at least one on the at least one second layer ( 251 ) arranged electrically conductive third layer ( 252 . 253 . 254 ) and - at least one on the at least one electrically conductive third layer ( 252 . 253 . 254 ) thermally and / or electrically insulating fourth layer ( 256 ). Multilayer heatable media line ( 2 . 3 ) according to claim 1, characterized in that between at least two layers ( 250 . 251 . 252 . 253 . 254 . 256 ) at least one adhesion promoter layer is arranged. Multilayer heatable media line ( 2 . 3 ) according to one of the preceding claims, characterized in that at least one outer thermal insulation layer ( 259 ) whose thermal conductivity is lower than that of the further layers ( 250 . 251 . 252 . 253 . 254 . 256 ) of the conduit wall ( 25 . 35 ) of the media line ( 2 . 3 ). Multilayer heatable media line ( 2 . 3 ) according to one of the preceding claims, characterized in that at least one cladding tube ( 260 ) between the inside of the cladding tube and the outside of the insulating fourth layer ( 256 ) of the conduit wall ( 25 . 35 ) of the media line ( 2 . 3 ) is provided enclosed insulating air volume. Multilayer heatable media line ( 2 . 3 ) according to one of the preceding claims, characterized in that one or two electrically conductive layers ( 252 . 253 . 254 ) are provided or an electrically conductive layer and a non-electrically conductive, insulating cover layer are provided. Multilayer heatable media line ( 2 . 3 ) according to one of the preceding claims, characterized in that the electrically conductive layer ( 252 . 253 . 254 ) is made conductive by means of at least one electrically conductive additive, in particular by Leitruß, metal powder, graphite, nanoparticles, such as carbon nanotubes. Multilayer heatable media line ( 2 . 3 ) according to one of the preceding claims, characterized in that at least one contact conductor ( 255 ) of the electrically conductive layer ( 252 . 253 . 254 ) in contact with only one surface of the layer ( 253 ) stands. Multilayer heatable media line ( 2 . 3 ) according to one of the preceding claims, characterized in that the electrically conductive third layer ( 252 . 253 . 254 ) of a material of the same class of material as the second layer providing mechanical strength and / or compressive strength ( 251 ), wherein in particular the material of the electrically conductive third layer ( 252 . 253 . 254 PA12 is conductively doped and the second mechanical strength and / or compressive strength-imparting layer ( 251 ) PA12 is. Multilayer heatable media line ( 2 . 3 ) according to one of the preceding claims, characterized in that the insulating fourth layer ( 256 ) for reducing the conductivity of at least one foamed material or at least contains a foamed material. Multilayer heatable media line ( 2 . 3 ) according to one of the preceding claims, characterized in that the material of the at least one inner layer ( 250 ) of the conduit wall ( 25 . 35 ) of the media line ( 2 . 3 ) has a higher extensibility, in particular higher elongation at break, than the material of the second, over the at least one inner layer ( 250 ) layer ( 251 ) of the conduit wall ( 25 . 35 ) of the media line ( 2 . 3 ). Multilayer heatable media line ( 2 . 3 ) according to one of the preceding claims, characterized in that the at least one inner layer ( 250 ) of ETFE is to avoid cracking. Multilayer heatable media line ( 2 . 3 ) according to one of the preceding claims, characterized in that the at least one inner layer ( 250 ) has a layer thickness of 0.02 to 1 mm, the at least one second layer ( 251 ) has a layer thickness of 0.5 to 2 mm and the at least one third layer ( 252 . 253 ) has a layer thickness of 0.5 to 2 mm. Multilayer heatable media line ( 2 . 3 ) according to one of the preceding claims, characterized in that the media line ( 2 . 3 ) Dimensions of outer diameter of the media line ( 2 . 3 ) and wall thickness of the conduit wall ( 25 . 35 ) of 4 × 1 to 1.2 mm or 5 × 1 to 1.5 mm or 6 × 1 to 1.5 mm or 8 × 1 to 2 mm or 10 × 1.5 to 2 mm or 12 × 1.5 up to 3 mm. Multilayer heatable media line ( 2 . 3 ) according to one of the preceding claims, characterized in that the materials of the layers ( 250 . 251 . 252 . 253 . 254 . 256 ) of the multi-layered heatable media line are resistant to high temperatures, in particular the or part of the layers ( 250 . 251 . 252 . 253 . 254 ) consist of a material combination of ETFE, PPA, conductive doped PPA. Assembled media line ( 1 ) with at least one multilayer media line, in particular multi-layer heatable media line ( 2 . 3 ) according to one of the preceding claims, with a conduit wall ( 25 . 35 ) and an inner conduit lumen ( 26 . 36 ) for the passage of medium, in particular a freeze-endangered medium, and with at least one end to the media line ( 2 . 3 ) arranged connecting component ( 20 . 21 . 30 . 31 ), characterized in that the conduit wall ( 25 . 35 ) of the at least one multilayer media line ( 2 . 3 ) of at least four layers of material ( 250 . 251 . 252 . 253 . 254 . 256 ) comprising at least one inner layer forming a permeation barrier and / or a crack formation preventing or retarding ( 250 ), at least one on the at least one inner layer ( 250 ), the mechanical strength and / or compressive strength-imparting second layer ( 251 ), at least one on the at least one second layer ( 251 ) arranged electrically conductive third layer ( 252 . 253 . 254 ) and at least one on the at least one electrically conductive third layer ( 252 . 253 . 254 ) thermally and / or electrically insulating fourth layer ( 256 ), and that at least one of the connection components ( 20 . 21 . 30 . 31 ) cohesively with the at least one mechanical strength and / or compressive strength-imparting second layer ( 251 ) of the conduit wall ( 25 . 35 ), wherein the material of the connection component ( 20 . 21 . 30 . 31 ) to the material of this second layer ( 251 ) of the conduit wall ( 25 . 35 ) is adjusted.

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