Connecting element and pipe connection including the connecting element

Abstract

A connecting element (1) for establishing a pipe connection between the connecting element (1) and a plastic pipe or a metal-plastic composite pipe, wherein the connecting element (1) has at least one support body (2, 2a) for sliding onto an end (14) of the pipe, the support body being provided with a plurality of circumferential outer ribs (3, 3a, 3b, 3c), wherein the at least one support body (2, 2a) has a central axis (4) and an open end (8), and at least two circumferential outer ribs (3, 3a, 3b , 3c) are inclined at an acute angle (9, 9a, 9b, 9c) relative to the central axis (4), wherein the acute angle (9, 9a, 9b) at which the circumferential outer ribs (3, 3a, 3b) are inclined relative to the central axis (4) is different from the acute angle (9a, 9b, 9c) at which at least one of the circumferential outer ribs (3a, 3b, 3c) is inclined relative to the central axis (4) at a greater distance from the opening end (8) than the circumferential outer ribs (3, 3a, 3b).

Description

Technical Field

[0001] The present invention relates to a connecting element for establishing a pipe connection between a connecting element and a plastic pipe or a metal-plastic composite pipe, wherein the connecting element has at least one support body for sliding to the end of the pipe, the support body is provided with a plurality of circumferential outer ribs, wherein the at least one support body has a central axis and an open end, and at least two circumferential outer ribs are inclined at an acute angle relative to the central axis. In addition, the present invention also relates to a pipe connection between the end of an all-plastic pipe or a plastic composite pipe and the connecting element, wherein the pipe connection comprises the end of the all-plastic pipe or the plastic composite pipe and such a connecting element. Background Art

[0002] Such connecting elements and pipe connections including such connecting elements are disclosed in the prior art. The pipe end is fixed to the connecting element by means of a fixing sleeve arranged on the pipe end, by means of which the pipe end is pressed against the outer contour of a support body having circumferential outer ribs. Different types of connection techniques are used, depending on the application method of the fixing sleeve used. In a sliding sleeve connection, which is also called an axial crimping connection, the support body of the connecting element is inserted into the opened or unopened pipe end, and a sliding sleeve resting on the outside of the pipe end is axially sleeved onto the pipe end with the inserted support body of the connecting element by means of a special sliding tool. Such an axial crimping system with a sliding sleeve is described, for example, in DE 101 30 858 A1. In the case of a radial crimping connection, a compression sleeve is first slid onto the plastic pipe to be connected. Then the support body, which can be made of metal or plastic material, is inserted into the pipe end of the plastic pipe. The compression sleeve is positioned on the support sleeve on the pipe end and is then pressed radially onto the pipe end by means of a corresponding compression tool, wherein the compression sleeve is mechanically and irreversibly deformed. The support body can consist of metal, for example of dezincification-resistant brass or stainless steel, or of a hydrolysis-resistant polymer material such as polysulfone (PSU), polyethersulfone (PES) or polyphenylsulfone (PPSU).

[0003] In particular in the case of mechanical pipe connections in which the pipe ends to be applied to the support body are not open, the dimensions of the individual components need to be coordinated, wherein in particular the outer diameter of the connection element and the inner diameter of the pipe are selected in such a way that the connection element can be easily inserted into the pipe end, but does not fall out of the pipe under its own weight. In addition, when cutting, in particular metal-plastic composite pipes, burrs may occur, which make it more difficult to insert the connection element into the cut pipe end. In addition, the feasibility of inserting the connection element into the pipe end may also be adversely affected by the cutting of the pipe, since the ovality of the pipe may be further increased by the influence of the pipe cutter. For these reasons, before the connection element is inserted or slid onto its support body, it is usually necessary to calibrate the pipe with the help of special tools, so that the ovality of the pipe is reduced and any burrs that may be present are removed by chamfering the pipe end, if appropriate. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a connecting element and a pipe connection comprising said connecting element which overcome the disadvantages of the prior art. The connecting element according to the invention should in particular be easier to insert into a pipe end, wherein a pipe calibration step may no longer be necessary.

[0005] The invention achieves the above and other objects by means of a connecting element having the features of claim 1 or a pipe connecting piece having the features of claim 12. Preferred embodiments of the connecting element according to the invention and of the pipe connecting piece according to the invention are described in the dependent claims.

[0006] According to the present invention, it has been found that the circumferential outer ribs inclined at an acute angle relative to the central axis of the support body have a positive effect on the feasibility of the support body inserting the end of the pipe. This effect is particularly evident in the case of a very gentle inclination. However, based on the length of the circumferential outer ribs caused by the very gentle inclination, the radial force transmitted by the fixed sleeve is distributed over a larger area, which may impair the stability of the resulting pipe connection. This can be offset in the following way: the support body of the connecting element includes at least another circumferential outer rib with a larger inclination. In the case of adopting such circumferential outer ribs with a larger inclination, the radial force transmitted by the fixed sleeve acts on a smaller area, thereby improving the stability of the pipe connection. In addition, the ovality of the pipe end caused by cutting the pipe to length when sliding onto the support body of the connecting element can be reduced by circumferential outer ribs with different larger inclinations. The burrs that may exist on the end of the pipe, which may be caused by the cutting tool when cutting the pipe, will hardly affect the feasibility of inserting the end of the pipe with a support body having such circumferential outer ribs. When using such a connecting element, the additional step of aligning the pipe is therefore omitted.

[0007] The present invention therefore provides a connecting element for establishing a pipe connection between the connecting element and a plastic pipe or a metal-plastic composite pipe, wherein the connecting element has at least one support body for sliding onto the end of the pipe, the support body being provided with a plurality of circumferential outer ribs, wherein the at least one support body has a central axis and an open end, and at least two of the circumferential outer ribs are inclined at an acute angle relative to the central axis, wherein according to the invention, the connecting element is characterized in that the acute angle at which the circumferential outer ribs are inclined relative to the central axis is different from the acute angle at which at least one of the circumferential outer ribs is inclined relative to the central axis at a greater distance from the open end than the first-mentioned circumferential outer rib. In addition, the present invention also relates to a pipe connection between the end of an all-plastic pipe or a plastic composite pipe and a connecting element, the pipe connection comprising a pipe end of an all-plastic pipe or a plastic composite pipe and a connecting element according to the invention.

[0008] In the case of the connection element according to the invention, it is advantageous if the circumferential outer ribs are inclined at a smaller acute angle relative to the central axis than at least one of the circumferential outer ribs which is spaced further from the open end than the circumferential outer ribs mentioned. This helps to reduce the ovality of the cut-off pipe end to a greater extent. For this purpose, it is particularly preferred if the angle of inclination of the circumferential outer ribs increases gradually starting from the open end of the support body.

[0009] It has proven to be advantageous if the difference between the acute angle at which the circumferential outer rib is inclined relative to the central axis and the acute angle at which at least one of the circumferential outer ribs which is spaced further from the opening end than the preceding circumferential outer ribs is inclined relative to the central axis is in the range of 3° to 20°, preferably in the range of 5° to 15°, particularly preferably in the range of 8° to 12°. When the inclination angle is within these ranges, there is a balance between the ease of insertion of the support body of the connection element according to the invention and the stability of the pipe connection.

[0010] It is also advantageous that the support body includes at least one circumferential outer rib with a substantially rectangular cross section. Such circumferential outer ribs with a substantially rectangular cross section are not susceptible to the impact of falling impact defects. Such rectangular ribs may have a negative impact on the slidability (Aufschiebbarkeit) of the pipe end, therefore, preferably, at least one circumferential outer rib with a substantially rectangular cross section is arranged on one side of the open end of the support body and / or on one side of the open end of the support body, which is inclined at an acute angle relative to the central axis. It is particularly preferred in this regard that the circumferential outer rib with a substantially rectangular cross section has a smaller outer diameter than the outer rib inclined at an acute angle relative to the central axis. This ensures that the pipe can simply slide onto the support body of the connecting element according to the present invention, wherein the reduced diameter of the circumferential outer rib with a substantially rectangular cross section ensures the sealing effect under the state of crimping all circumferential outer ribs. For this reason, it is particularly preferred that the inclined circumferential outer rib has a steeper inclination angle, preferably in the range of 15° to 50°. Therefore, the inclined circumferential outer ribs can be deeply stuck in the pipe material and can ensure the high sealing of the produced pipe connector. In other preferred embodiments, the circumferential outer ribs with a substantially rectangular cross section are the outer ribs farthest from the open end of the support body. In a particularly preferred embodiment, the circumferential outer ribs with a substantially rectangular cross section can also be the circumferential outer ribs farthest from the open end of the support body. In this case, these circumferential outer ribs can also have an outer diameter as large as the inclined circumferential outer ribs. In this case, when the support body is inserted into the pipe end, any burrs that may occur have been flattened by the inclined circumferential outer ribs, thereby no longer hindering the support body from being inserted into the pipe end.

[0011] It is also advantageous if the connection element further comprises at least one circumferential flange. When producing the pipe connection according to the invention, such a circumferential flange serves as an engagement point for a crimping tool.

[0012] It is also advantageous if the connecting element is designed as a polymer component or a metal component. In this case, it has proven to be particularly advantageous if the polymer material of the connecting element is selected from the group consisting of polypropylene (PP), polyamide, polyvinylidene fluoride (PVDF), polyether sulfone (PES), polysulfone (PSU), polyphenyl sulfone (PPSU), polyphenylene sulfide (PPS), polyvinyl chloride (PVC), polyoxymethylene (POM), acrylonitrile-butadiene-styrene copolymer (ABS) and polyester carbonate (PESC) and copolymers and mixtures thereof, all in fiber-reinforced form. As an alternative, metal materials, such as brass, in particular Red brass and stainless steel.

[0013] In the case of the pipe connection according to the invention, it is preferably designed as an axial crimp connection with a sliding sleeve. The high stability of the connecting element according to the invention is particularly suitable for such axial crimp connections, during the production of which large axial forces act in particular on the circumferential flange. In the case of axial crimping systems in which the pipe ends are not opened before the support body is inserted, it is particularly advantageous to flatten the burrs formed by cutting the pipe again by means of the circumferential outer ribs with different inclinations.

[0014] According to the present invention, all-plastic pipes preferably made of polyethylene (PE, especially PE 100 and PE-RT), cross-linked polyethylene (PE-X, especially PE-Xa, PE-Xb and PE-Xc), polypropylene (especially random polypropylene PP-R) and polybutene (PB); and plastic composite pipes preferably having layers composed of polyethylene (PE, especially PE100 and PE-RT), cross-linked polyethylene (PE-X, especially PE-Xa, PE-Xb and PE-Xc), polypropylene (especially random polypropylene PP-R) and / or polybutene (PB) are used as plastic pipes. In addition, a layer composed of ethylene-vinyl alcohol copolymer (EVOH) can also be used as an oxygen barrier layer. According to the invention, the metal-plastic composite pipe fitting (MKV pipe fitting) preferably comprises a layer consisting of polyethylene (PE, in particular PE 100 and PE-RT), cross-linked polyethylene (PE-X, in particular PE-Xa, PE-Xb and PE-Xc), polypropylene (in particular random polypropylene PP-R) and / or polybutene (PB) and at least one layer consisting of metal, preferably aluminum. This metal layer is preferably butt-welded. In the case of plastic composite pipe fittings and MKV pipe fittings, an adhesion-promoting layer can be inserted between the layers. According to the invention, all pipe fittings of the pipe connection according to the invention can have the same structure or one or more of these pipe fittings can have different pipe structures. In addition, according to the invention, these pipe fittings can also be fiber-reinforced. Fiber reinforcement of the conduit can be achieved in a single pipe fitting or all pipe fittings, over the entire pipe length or only in certain sections. With regard to the plastic pipe fittings or metal-plastic composite pipe fittings of the pipe connection according to the invention, it is particularly preferred that at least one layer of the corresponding pipe fitting comprises cross-linked polyethylene (in particular PE-Xa, PE-Xb and PE-Xc). The material "cross-linked polyethylene" is a material with shape memory or the so-called "memory effect". This memory effect consists in that the cross-linked polyethylene tries to regain its original shape after changing its outer geometry. When the pipe is opened, this causes the pipe comprising PE-X to try again to reach the inner diameter of the pipe before the opening after the opening. After the opening, the support of the connection element is inserted into the opened pipe end, so that when using pipes comprising at least one layer comprising cross-linked polyethylene, this memory effect leads to a particularly high tightness of the pipe connection according to the invention.

[0015] The connecting element according to the invention can be a threaded shaped part or a non-threaded shaped part, i.e. a connecting element without a thread. Such connecting elements include, in particular, connecting pieces, connecting angles, multiplexers, T-pieces, wall T-pieces, wall brackets, system transition pieces, Transition piece Angled transition pieces They do not have a thread. Accordingly, the term "thread former" refers to a connecting element having at least one thread former. This connecting element includes in particular connecting pieces, connecting angles, multi-way distributors, T-pieces, wall T-pieces, wall brackets, system transitions, transition pieces and angled transition pieces, each of which has at least one internal and / or external thread.

[0016] According to the invention, suitable materials for the sliding sleeve are preferably polymer materials, for example polypropylene and glass-fiber-reinforced polypropylene, polyamide and glass-fiber-reinforced polyamide, heat-resistant thermoplastics, such as polyphenylsulfone (PPSU), polyvinylidene fluoride (PVDF), polyethersulfone (PES), polysulfone (PSU), polyphenylene sulfide (PPS), acrylonitrile-butadiene-styrene copolymers (ABS) and polyester carbonates (PESC) and copolymers and mixtures thereof, wherein these polymer materials may also be fiber-reinforced, in particular glass-fiber-reinforced, and metallic materials, for example brass, in particular Red brass and stainless steel. Heat-resistant plastics and in particular polyphenylsulfone and polyvinylidene fluoride are particularly preferred as materials for the sliding sleeve. Cross-linked polyethylene (in particular PE-Xa, PE-Xb and PE-Xc) is also particularly preferred as a material for the sliding sleeve.

[0017] The pipe connection according to the invention is used in particular for pipelines and connection systems in drinking water installations, sprinkler systems, radiator connections, concrete core temperature controllers and surface heating and / or surface cooling systems.

[0018] For example, the pipe connector device according to the invention and its individual components, in particular the connecting element according to the invention, can be manufactured row by row or layer by layer using a row or layered manufacturing process (eg 3D printing). However, the connecting element according to the invention is preferably manufactured within the framework of an injection molding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be described in detail below in conjunction with the embodiments shown in the accompanying drawings.

[0020] Figure 1is a cross-sectional view of a connecting element according to one embodiment of the present invention;

[0021] Figure 2 is a cross-sectional view of a connecting element according to another embodiment of the present invention; and

[0022] Figure 3 FIG. 4 is a cross-sectional view of a pipe connector according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] Figure 1 The figure is a cross-sectional view of a connecting element 1 according to the invention for establishing a pipe connection between the connecting element 1 and a plastic pipe or a metal-plastic composite pipe according to one embodiment of the invention. The connecting element 1 according to the invention is a connecting piece having two supporting bodies 2, 2a. Figure 1 In the embodiment shown, the connecting element 1 is designed as a one-piece plastic component made of glass fiber reinforced polyphenylsulfone (PPSU). Figure 1 The structure of the connecting element 1 according to the present invention is described in detail with reference to the support body 2 on the left side, wherein it should be understood that these embodiments are correspondingly applicable to Figure 1 The support body 2a on the right side and other support bodies that may exist in other embodiments. Figure 1 In the embodiment shown, the support body 2 has four circumferential outer ribs 3, 3a, 3b, 3c. On its inner side, the support body 2 has a substantially cylindrical inner surface with a common center axis 4. A circumferential flange 5 forms the terminal end of the support body 2. The two support bodies 2, 2a are connected to each other via a connecting region 6. Furthermore, the two support bodies 2, 2a together with the connecting region 6 form a connecting channel 7 through which a medium can flow during operation of the connecting element 1 according to the invention.

[0024] The four circumferential outer ribs 3, 3a, 3b, 3c are zigzag-shaped in cross section. In this case, the side of the circumferential outer ribs 3, 3a, 3b, 3c facing the opening end 8 is inclined in an acute angle 9, 9a, 9b, 9c relative to the central axis 4. The side of the circumferential outer ribs 3, 3a, 3b, 3c facing away from the opening end 8 is at right angles to the central axis 4, wherein the transition zone between the side facing the opening end 8 and the bottom area of ​​the support body 2, 2a is rounded. In this case, the acute angle 9 of the circumferential outer rib 3 is 7°, the acute angle 9a of the circumferential outer rib 3a is 15°, the acute angle 9b of the circumferential outer rib 3b is 20°, and the acute angle 9c of the circumferential outer rib 3a is 30°. Therefore, the acute angles 9, 9a, 9b, 9c of the corresponding outer ribs 3, 3a, 3b, 3c inclined relative to the central axis 4 continuously increase from the opening end 5. This significantly reduces the ovality that occurs when cutting the pipe to length when sliding the pipe end onto the support 2, 2a of the connecting element 1 according to the invention. This makes it possible to omit the additional step of pipe calibration when using the connecting element 1 according to the invention.

[0025] In the pipe connector according to the present invention, the ends of the same or different plastic pipes or metal-plastic composite pipes can be connected to the two support bodies 2, 2a.

[0026] Figure 2 Another embodiment of the connecting element 1 according to the present invention is shown. Therefore, in order to avoid repetition, only the embodiment of the connecting element 1 according to the present invention will be described below. Figure 1 The differences between the illustrated embodiments are described below. Figure 1 The embodiments shown also apply accordingly to Figure 2 The same elements are denoted by the same reference numerals in the drawings.

[0027] Figure 2 A further embodiment of a connecting element 1 according to the invention is shown again in cross section. Figure 2 The connecting element 1 according to the invention is shown with Figure 1 The embodiment shown differs only in the design of the circumferential outer ribs. Figure 2 In the connecting element 1 according to the invention, the circumferential outer rib 3 adjacent to the open end 4 is designed as a sawtooth outer rib, wherein the acute angle 9 at which the circumferential outer rib 3 is inclined relative to the central axis 4 is 15°. This is followed by two circumferential outer ribs 10, 10a having a substantially rectangular cross section. Another circumferential outer rib 3a is arranged between the circumferential outer rib 10a and the circumferential flange 5, wherein in accordance with Figure 2In the embodiment, the acute angle 9a at which the circumferential outer ribs 3a are inclined relative to the central axis 4 is 20°. The large inclination of the circumferential outer ribs 3, 3a causes the circumferential outer ribs to be deeply embedded in the pipe material, which in turn leads to a high sealing performance of the resulting pipe connection. The circumferential outer ribs 10, 10a have a smaller outer diameter than the circumferential outer ribs 3, 3a inclined at an acute angle relative to the central axis 4. This ensures that the pipe can be simply slid onto the support body 2, 2a of the connecting element 1 according to the present invention. The circumferential outer ribs 10, 10a with a basically rectangular cross-section also make the connecting element 1 according to the present invention less susceptible to drop impact defects. In addition, in Figure 2 In the embodiment shown, the connecting element 1 is designed as a one-piece plastic component made of glass-fiber-reinforced polyphenylsulfone (PPSU).

[0028] at last, Figure 3 To include according to Figure 1 1 is a cross-sectional view of a pipe connection 11 of a connecting element 1 according to the invention, which in the embodiment shown is designed as a sliding sleeve connection, wherein only a pipe 12 is connected to the support body 2a. In this case, a sliding sleeve 13 is pressed axially onto the flared end 14 of the plastic pipe 12 which is slid onto the support body 2a, and this plastic pipe is slid close to the circumferential flange 5a of the support body 2a of the connecting element 1 according to the invention.

[0029] In order to produce the pipe connection 11 according to the invention, the sliding sleeve 13 is first slid onto the end 14 of the plastic pipe 12. Then, an opening tool is inserted into the end 14 of the plastic pipe 12 and the plastic pipe 12 is opened at this end by means of the opening tool. The support body 2a of the connecting element 1 according to the invention is then inserted into the opened end 14 of the plastic pipe 12 until the opened end 14 of the plastic pipe 12 is approximately in contact with the circumferential flange 5a. Finally, the sliding sleeve 13 is axially slid onto the opened end 14 of the plastic pipe 12 into which the support body 2a is inserted by means of a suitable sliding tool. In this case, the plastic material of the plastic pipe 12 is pressed into the outer contour of the support body 2a of the connecting element 1 according to the invention.

[0030] In an alternative embodiment, the pipe connection 1 according to the present invention can also be an axial crimp connection with a sliding sleeve 13, wherein the end 14 of the plastic pipe 12 is not opened. In this case, in the process of manufacturing the pipe connection 1 according to the present invention, the step of opening the pipe end 12 is omitted.

[0031] The invention has been described in detail with reference to the embodiments of the invention shown in the drawings. Of course, the invention is not limited to the embodiments shown, but the scope of the invention is given by the appended claims.

Claims

1. A connecting element (1) for establishing a pipe connection (11) between the connecting element (1) and a plastic pipe (12) or a metal-plastic composite pipe (12), wherein the connecting element (1) has at least one support body (2, 2a) for sliding onto a pipe end (14), the support body being provided with a plurality of circumferential outer ribs (3, 3a, 3b, 3c), wherein the at least one support body (2, 2a) has a central axis (4) and an open end (8), and at least two of the circumferential outer ribs (3, 3a, 3b, 3c) are inclined at an acute angle (9, 9a, 9b, 9c) relative to the central axis (4), It is characterized in that The acute angle (9, 9a, 9b) at which the circumferential outer rib (3, 3a, 3b) is inclined relative to the central axis (4) is different from the acute angle (9a, 9b, 9c) at which at least one of the circumferential outer ribs (3a, 3b, 3c) which is spaced farther from the opening end (8) than the circumferential outer ribs (3, 3a, 3b) is inclined relative to the central axis (4), The support body (2, 2a) comprises at least one circumferential outer rib having a substantially rectangular cross section, and The circumferential outer ribs with a substantially rectangular cross section have a smaller outer diameter than the outer ribs (3, 3a, 3b, 3c) inclined at an acute angle (9, 9a, 9b, 9c) relative to the central axis (4), The acute angles (9, 9a, 9b, 9c) at which the respective outer ribs (3, 3a, 3b, 3c) are inclined relative to the central axis (4) continuously increase starting from the open end (8).

2. The connecting element (1) according to claim 1, characterized in that The acute angle (9, 9a, 9b) at which the circumferential outer rib (3, 3a, 3b) is inclined relative to the central axis (4) is smaller than the acute angle (9a, 9b, 9c) at which at least one of the circumferential outer ribs (3a, 3b, 3c) which is spaced farther from the opening end (8) than the circumferential outer rib (3, 3a, 3b) is inclined relative to the central axis (4).

3. The connecting element (1) according to claim 1 or 2, characterized in that The difference between the acute angle (9, 9a, 9b) at which the circumferential outer rib (3, 3a, 3b) is inclined relative to the central axis (4) and the acute angle (9a, 9b, 9c) at which at least one of the circumferential outer ribs (3a, 3b, 3c) which is spaced farther from the opening end (8) than the circumferential outer ribs (3, 3a, 3b) is inclined relative to the central axis (4) is in the range of 3° to 20°.

4. The connecting element (1) according to any one of the preceding claims, characterized in that One side of the circumferential outer rib (3, 3a, 3b, 3c) facing the open end (8) of the support body (2, 2a) is inclined at an acute angle (9, 9a, 9b, 9c) relative to the central axis (4).

5. The connecting element (1) according to claim 1, characterized in that At least one circumferential outer rib (3, 3a, 3b, 3c) is arranged on one side of the circumferential outer rib with a basically rectangular cross section facing the open end (8) of the support body (2, 2a) and on the side of the circumferential outer rib with a basically rectangular cross section facing away from the open end (8) of the support body (2, 2a), and is inclined at an acute angle (9, 9a, 9b, 9c) relative to the central axis (4).

6. The connecting element (1) according to claim 1 or 5, characterized in that The circumferential outer rib having a substantially rectangular cross section is the outer rib farthest from the open end (8) of the support body (2, 2a).

7. The connecting element (1) according to any one of the preceding claims, characterized in that The connecting element also comprises at least one circumferential flange (4, 4a) which forms the terminal end of the supporting body (2, 2a).

8. The connecting element (1) according to any one of the preceding claims, characterized in that The connecting element (1) is formed as a polymer component.

9. The connecting element (1) according to any one of the preceding claims, characterized in that The polymer material of the connecting element (1) is selected from the group consisting of polypropylene (PP), polyamide, polyvinylidene fluoride (PVDF), polyethersulfone (PES), polysulfone (PSU), polyphenylsulfone (PPSU), polyphenylene sulfide (PPS), polyvinyl chloride (PVC), polyoxymethylene (POM), acrylonitrile-butadiene-styrene copolymer (ABS) and polyester carbonate (PESC) as well as copolymers and mixtures thereof, all of which are in fiber-reinforced form.

10. A pipe connector (11) located between an end (14) of a plastic pipe (12) or a metal-plastic composite pipe (12) and a connecting element (1), the pipe connector comprising: An end portion (14) of the plastic pipe (12) or the metal-plastic composite pipe (12); as well as A connecting element (1) according to any one of claims 1 to 9.

11. The pipe connector (11) according to claim 10, characterized in that The pipe connection piece (11) is designed as an axial crimping connection piece with a sliding sleeve (13).

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