Fluid piping with pipes

Abstract

The present invention relates to a fluid piping (10) having a pipe made of at least two plastic layers, where a first plastic layer (12) is made of hydrolysis-resistant polyamide 6 (PA6). The present invention provides a cost-effective fluid piping (10).

Description

[Technical field]

[0001] The present invention relates to a fluid pipeline including a pipe. [Background technology]

[0002] Pipes for transporting fluids, such as, for example, cooling water for automobiles, must meet certain requirements during use. For this, the material of the pipe must not be dissolved by the fluid. This must be avoided even at relatively high temperatures. Furthermore, the pipe must be impermeable to the transported fluid and its chemical components, so that the fluid cannot pass through the walls of the pipe. The intention is, firstly, to prevent deterioration of the quality of the transported fluid, and secondly, to prevent the penetration of the fluid into the walls of the pipe and to prevent changes in the material of the walls. It is also necessary to prevent seepage. This is particularly relevant when the fluid is stagnant in the pipe, i.e. when there is at least intermittent no transport of fluid. Furthermore, the pipe must have mechanical properties that allow the pipe to be easily and reliably connected to other pipe components.

[0003] It is a known method to use multi-layered plastic piping. These plastic piping are made of plastics that exhibit the above-mentioned properties for water and water-containing fluids. However, these plastics and their processing are relatively expensive. More preferred plastics, such as polyamide 6, are not used in the prior art because they dissolve in water or absorb water, resulting in changes in their physical properties. For example, when water is absorbed, the material may increase in volume or break. Even protective layers made of water-impermeable materials, such as polypropylene, polyamide 12, or polyphthalamide, do not provide sufficient protection against the diffusion of water molecules into the interior of the pipe material of the fluid piping.

[0004] SUMMARY OF THE PRESENT EMBODIMENT It is an object of the present invention to provide an inexpensive fluid piping system. Summary of the Invention [Problem to be solved by the invention]

[0005] The main features of the invention are specified in claims 1, 13 and 14. Embodiments are the subject of claims 2 to 12.

[0006] According to the invention, a fluid pipeline having a pipe comprising at least two plastic layers is provided, the first plastic layer comprising hydrolysis-resistant polyamide 6 (PA6), the first plastic layer extending around a second plastic layer, the second plastic layer being a barrier layer against the medium flowing through the fluid pipeline, the second plastic layer being Polyethylene (PE) and It is made of polyphenylene sulfide (PPS).

[0007] The core of the invention is the use of hydrolysis-resistant polyamide 6 in at least one of the two plastic layers of the fluid pipe. Hydrolysis-resistant polyamide 6 is less damaged by water absorption than conventional polyamide 6. Thus, the hydrolysis-resistant polyamide 6 of the first plastic layer is not altered or dissolved by water molecules, or is altered or dissolved to a lesser extent, than conventional polyamide 6. This makes it possible for the first time to use polyamide 6 material to manufacture fluid pipes for carrying water. Hydrolysis-resistant polyamide 6 is inexpensive, and its use to create the basic structure of the fluid pipe reduces the need to use other expensive materials. In particular, less polyamide 12, which is more expensive compared to polyamide 6, can be used. Fluid pipes made of hydrolysis-resistant polyamide 6 have acceptable properties when used as pipes for water, and are nevertheless inexpensive.

[0008] The second plastic layer may be free of hydrolysis resistant polyamide 6 (PA6).

[0009] The second plastic layer may therefore consist of a material different from the hydrolysis-resistant polyamide 6. In this way, for example, reinforcing or barrier layers for fluid lines can be produced.

[0010] Additionally, in one example, a second plastic layer may extend around the periphery of the first plastic layer.

[0011] Therefore, the second plastic layer is disposed outside the fluid pipe when viewed from the first plastic layer.

[0012] The second plastic layer here may consist of polyamide 612 (PA612).

[0013] The second plastic layer, made of polyamide 612, has effective media resistance with respect to grease, oil, motor fuel, hydraulic fluid, water and alkalis. If the fluid piping is used in an environment where these substances can reach the outer layer of the pipe, the inner layers, especially the first plastic layer, are protected by the second plastic layer. The second plastic layer therefore forms a protective layer against external influences for the inner layers, especially the first plastic layer. The second plastic layer is also therefore elastic.

[0014] Alternatively or additionally, the second plastic layer may consist of Polyamide 610 (PA610).

[0015] The second plastic layer of polyamide 610 is therefore made of a polyamide suitable for extrusion, which in turn combines high flexibility with high strength, and also protects the underlying plastic layers, especially the first plastic layer, from other fluids, for example used in the vehicle.

[0016] In another example, a first plastic layer may extend around a second plastic layer.

[0017] In this case, the second plastic layer is disposed inside the fluid pipe relative to the first plastic layer.

[0018] The second plastic layer may be made of polypropylene (PP). Alternatively or additionally, the second plastic layer may be made of polyethylene (PE).

[0019] Both polypropylene and polyethylene have excellent thermal properties and can be used as a barrier layer against the medium (e.g. water) flowing through the fluid pipes, thus reducing the contact of water molecules with the hydrolysis-resistant polyamide 6.

[0020] Alternatively or additionally, the second plastic layer may be made of polyphenylene sulfide (PPS).

[0021] Polypropylene sulfide has superior thermal properties compared to polypropylene and polyethylene.

[0022] The fluid conduit may have at least three plastic layers, with a first plastic layer disposed between a second plastic layer and a third plastic layer.

[0023] Thus, a first plastic layer made of hydrolysis-resistant polyamide 6 can form the basic structure of the fluid line, where the second and third plastic layers can shield the first plastic layer against external influences and / or against the medium flowing through the fluid line.

[0024] The third plastic layer may be free of hydrolysis resistant polyamide 6.

[0025] The first plastic layer may also occupy 25% to 75%, preferably 30% to 70%, more preferably 40% to 60% of the total area of ​​the at least two plastic layers of the pipe in the radial direction.

[0026] That is, the thickness of the pipe of the fluid piping is formed by the first plastic layer in the range of 25% to 75%. The greater the proportion of the first plastic layer made of inexpensive hydrolysis-resistant polyamide 6, the cheaper the fluid piping can be formed.

[0027] The present invention further relates to a cooling water system for a vehicle, the cooling water system comprising a cooling device, an element to be cooled, and at least one fluid pipe as described above, the at least one fluid pipe fluidly connecting the cooling device and the element to be cooled.

[0028] The advantages and effects of the cooling water system as well as further developments can be derived from the advantages and effects of the fluid piping described above as well as further developments, and therefore in this respect attention is drawn to the above description.

[0029] In a further aspect, the invention relates to the use of a fluid line according to the above description for conveying water in a vehicle.

[0030] The advantages and effects as well as developments relating to the use of the fluid pipe are evident from the advantages and effects as well as developments of the fluid pipe described above, and therefore in this respect reference is made to the above description.

[0031] Other features, details and advantages of the present invention will become apparent from the claims and the following description of the embodiments with reference to the drawings. [Brief description of the drawings]

[0032] [Figure 1] FIG. 1 is a schematic diagram of a fluid conduit having at least two plastic layers. [Figure 2a] FIG. 2 is a schematic cross-sectional view showing an example of the fluid piping according to FIG. [Figure 2b] FIG. 2 is a schematic cross-sectional view showing an example of the fluid piping according to FIG. [Figure 2c] FIG. 2 is a schematic cross-sectional view showing an example of the fluid piping according to FIG. [Diagram 3] FIG. 1 is a schematic diagram of a cooling water system with fluid piping. [Figure 4] 1 is a schematic diagram of a vehicle equipped with fluid piping; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0033] FIG. 1 is a schematic diagram of a fluid pipeline generally designated 10.

[0034] The fluid pipe 10 extends along a length direction 11. A radial direction 15 of the fluid pipe 10 is defined as a direction perpendicular to the length direction 11.

[0035] 2a to 2c are cross-sectional views showing various examples of the fluid pipe 10 according to FIG.

[0036] 2a shows an example with a total of five plastic layers. The first plastic layer 12 is located in the middle and is made of hydrolysis-resistant polyamide 6. The first plastic layer 12 is bordered on its inner and outer borders by two further plastic layers, respectively. The first plastic layer 12 constitutes, for example, 45% to 55%, preferably 50%, of the total area of ​​the pipe wall of the fluid pipeline 10.

[0037] The second plastic layer 14 extends around the periphery of the first plastic layer 12. To this end, the second plastic layer 14 is in direct contact with the first plastic layer 12. In this example, it is made of polyamide 612 and may, for example, constitute 5% to 15%, preferably 10%, of the total area of ​​the tube wall.

[0038] The third plastic layer 16 is surrounded by and directly contacts the first plastic layer 12. In this example, the third plastic layer 16 may be constructed from polypropylene and may contribute, for example, 5% to 15%, preferably 10%, to the area of ​​the tube wall.

[0039] The fourth plastic layer 18 may extend into the third plastic layer 16, i.e., the fourth plastic layer 18 is surrounded by the third plastic layer 16. In this example, the fourth plastic layer 18 may be manufactured from a further polypropylene material and may have a total area of ​​the pipe wall of, for example, 15% to 25%, preferably 20%. In this example, the fourth plastic layer 18 forms the innermost layer of the fluid pipe 10.

[0040] A fifth plastic layer 20 may be provided as an outer layer extending around the second plastic layer 14 and surrounding all of the other plastic layers. This fifth plastic layer 20 may be manufactured from a polyamide 12 material and may contribute, for example, 5% to 15%, preferably 10%, to the overall extent of the tube wall in the radial direction 15.

[0041] Also, preferably, the material of the fifth plastic layer 20 may further include colored pellets. In this way, the fifth plastic layer 20 may be colored. The remaining part of the fifth plastic layer 20 may further be additionally formed by other substances that slightly modify the physical properties of the fifth plastic layer 20. The basic properties of the fifth plastic layer 20 are not substantially modified by the colored pellets and / or additives.

[0042] 2b is a cross-sectional view of a further example of a fluid pipe 10 having five plastic layers. A first plastic layer 12 is disposed inside the outer layer and is made of hydrolysis-resistant polyamide 6. The first plastic layer 12 is bounded at its inner and outer boundaries by a second plastic layer 14 and a third plastic layer 16. The first plastic layer 12 in this example constitutes 35% to 45%, preferably 40%, of the total area of ​​the pipe wall of the fluid pipe 10.

[0043] The second plastic layer 14 now extends around the first plastic layer 12 and forms the outermost layer of the fluid pipe 10. The second plastic layer 14 is in direct contact with the first plastic layer 12. In this example, the second plastic layer 14 may be comprised of polyamide 612 and may comprise, for example, 5% to 15%, preferably 10%, of the total area of ​​the pipe wall.

[0044] Moreover, preferably, the material of the second plastic layer 14 may further include colored pellets. In this way, the second plastic layer 14 may be colored. The remaining part of the second plastic layer 14 may further be formed by other substances that slightly modify the physical properties of the second plastic layer 14. The basic properties of the second plastic layer 14 are not substantially modified by the colored pellets and / or additives.

[0045] The third plastic layer 16 is surrounded by and directly adjacent to the first plastic layer 12. In this example, the third plastic layer 16 may be comprised of polypropylene and may contribute, for example, 7% to 13%, preferably 10%, to the area of ​​the pipe wall.

[0046] The fourth plastic layer 18 may extend into the third plastic layer 16, i.e., the fourth plastic layer 18 is surrounded by the third plastic layer 16. In this example, the fourth plastic layer 18 may be made from high density polyethylene and may constitute, for example, 15% to 25%, preferably 20%, of the total area of ​​the tube wall.

[0047] A sixth plastic layer 22 may be provided as a contact layer for the fluid flowing through the fluid pipe 10, which layer extends into the fourth plastic layer 18. In other words, the fourth plastic layer 18 surrounds the sixth plastic layer 22. This sixth plastic layer 22 may be manufactured from a polypropylene material and may contribute, for example, 10% to 20%, preferably 15%, to the total extent of the pipe wall in the radial direction 15.

[0048] 2c is a cross-sectional view of a further example of a fluid pipe 10. However, in this example, the fluid pipe 10 is made of only four plastic layers. The first plastic layer 12 is disposed inside the outer layer and is made of hydrolysis-resistant polyamide 6. The first plastic layer 12 is bounded at its inner and outer boundaries by a second plastic layer 14 and a third plastic layer 16. In this example, the first plastic layer 12 constitutes 55% to 65%, preferably 60%, of the total area of ​​the pipe wall of the fluid pipe 10.

[0049] The second plastic layer 14 extends around the first plastic layer 12 and forms the outermost layer of the fluid pipe 10. The second plastic layer 14 is in direct contact with the first plastic layer 12. The second plastic layer 14 may be comprised of polyamide 610 in this example and may comprise, for example, 10% to 20%, preferably 15%, of the total area of ​​the pipe wall.

[0050] Also, preferably, the material of the second plastic layer 14 may further include colored pellets. In this way, the second plastic layer 14 may be colored. The remaining portion of the second plastic layer 14 may further be formed by other substances that slightly modify the physical properties of the second plastic layer 14. The basic quality of the second plastic layer 14 is not substantially modified by the colored pellets and / or additives.

[0051] The third plastic layer 16 is surrounded by the first plastic layer 12 and is in direct contact with the first plastic layer 12 from the inside. In this example, the third plastic layer 16 may be made of polyphenylene sulfide and may contribute, for example, 5% to 15%, preferably 10%, to the area of ​​the pipe wall.

[0052] The fourth plastic layer 18 may extend into the third plastic layer 16, in other words, the fourth plastic layer 18 is surrounded by the third plastic layer 16. In this example, the fourth plastic layer 18 may be manufactured from a further polyphenylene sulfide material and may form the innermost layer of the fluid pipe 10. Furthermore, the fourth plastic layer 18 may comprise, for example, 10% to 20%, preferably 15%, of the total area of ​​the pipe wall.

[0053] FIG. 3 is a schematic diagram of a system generally designated by the reference numeral 50.

[0054] The cooling system comprises a cooling device 30 and an element to be cooled 40. The cooling device 30 and the element to be cooled 40 are fluidly connected to each other via at least one fluid line 10 according to the above description. The fluid line 10 may in this case transport cooling water between the cooling device 30 and the element to be cooled 40.

[0055] 4 shows a vehicle 52 comprising a cooling system 50. The element 40 to be cooled may in this case be, for example, a battery of an electric vehicle. The cooling device 30 of the cooling system is in this case fluidly connected to the battery of the electric vehicle by a fluid line 10.

[0056] The invention is not limited to the one embodiment described above, but may be modified in various ways.

[0057] All features and advantages emerging from the claims, specification and drawings, including details of design, physical arrangements and method steps, both individually and in various combinations, are essential to the invention. [Explanation of symbols]

[0058] 10 Fluid Piping 11 Length Direction 12 First Plastic Layer 14 Second Plastic Layer 15 Radial 16 Third Plastic Layer 18 Fourth Plastic Layer 20 Fifth Plastic Layer 22 Sixth Plastic Layer 30 Cooling device 40 Elements to be cooled 50 Cooling System 52 vehicles

Claims

1. A pipe having at least two plastic layers, the first plastic layer (12) being made of hydrolysis-resistant polyamide 6 (PA6), the first plastic layer (12) extends around the second plastic layer; The fluid pipe, wherein the second plastic layer is a barrier layer against a medium flowing through the fluid pipe, the second plastic layer being made of polyethylene (PE) and polyphenylene sulfide (PPS).

2. The fluid pipe of claim 1 , wherein the second plastic layer does not include hydrolysis resistant polyamide 6 (PA6).

3. 3. A fluid pipe according to claim 1 or claim 2, comprising at least three plastic layers, the first plastic layer (12) being disposed between the second plastic layer and a third plastic layer.

4. 4. The fluid pipe of claim 3, wherein the third plastic layer is free of hydrolysis resistant polyamide 6 (PA6).

5. A fluid pipe according to any one of claims 1 to 4, wherein the first plastic layer (12) constitutes between 30% and 70% of the total extent of the at least two plastic layers of the pipe in a radial direction (15).

6. A fluid pipe according to any one of claims 1 to 4, wherein the first plastic layer (12) constitutes between 40% and 60% of the total extent of the at least two plastic layers of the pipe in a radial direction (15).

7. A cooling water system (50) for a vehicle (52), comprising: A cooling device (30); An element to be cooled (40), At least one fluid pipe according to any one of claims 1 to 6, At least one said fluid line (10) fluidly connects said cooling device (30) and said element (40) to be cooled.

8. Use of a fluid line (10) according to any one of claims 1 to 6 for conveying water in a vehicle (52).

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