WO2006007944A1

WO2006007944A1 - Tube joint subassembly, tube subassembly comprising such a tube joint subassembly, and sliding sleeve for said tube joint subassembly or tube assembly

Info

Publication number: WO2006007944A1
Application number: PCT/EP2005/006988
Authority: WO
Inventors: Karl-Heinz Haunstetter
Original assignee: Rehau Ag + Co
Priority date: 2004-07-17
Filing date: 2005-06-29
Publication date: 2006-01-26
Also published as: DE102004034686B3

Abstract

Disclosed is a tube subassembly (1) comprising a tube joint subassembly with a supporting element (2) and a sliding sleeve (9) that can be slid onto the same. A final section (18) of a tube (14) can be pressed in between the supporting element (2) and the sliding sleeve (9) when the sliding sleeve (9) is in the mounted position. Said sliding sleeve (9) is embodied such that the interior wall (11) thereof can follow a change in the radially extending pressure which is applied to the sliding sleeve (9) by the tube (14), resulting in the inner circumference of the sliding sleeve being modified. Such a sliding sleeve (9) makes it possible to create a tube joint subassembly which forms a secure seal also in applications with frequent temperature variations while the effort for producing and assembling the same is limited.

Description

Pipe connection assembly, pipe assembly with a der¬ like pipe connection assembly and sliding sleeve for this pipe connection assembly or for this pipe assembly

The invention relates to a pipe connection assembly according to the preamble of An¬ claim 1. Furthermore, the invention relates to a pipe assembly according to claim 15 with such a pipe connection assembly and according to claim 18, a sliding sleeve for these assemblies.

A pipe connection assembly according to the preamble of claim 1 and a pipe assembly comprising a support body, a sliding sleeve and a pipe which can be pressed in between them are known from prior use as well as from DE 197 56 074 C1, DE 101 30 003 A1, US Pat. DE 201 09 784 U1, DE 199 56 000 C1, DE 195 14 210 C2 and DE 42 39 705 C2.

In practice, in these known assemblies, in particular in applications with frequent temperature changes, a leak can not be ruled out or can only be avoided with great manufacturing or assembly effort.

It is therefore an object of the present invention to develop a pipe connection assembly of the type mentioned in such a way that even in applications with frequent gene temperature changes a tightness is ensured, with the manufacturing or assembly costs to be kept within limits.

This object is achieved by a pipe connection assembly with the features of the characterizing part of claim 1. According to the invention, it has been recognized that the leaks in the prior art are due to the fact that the individual components of the pipe connection assembly do not permanently abut each other due to their different expansion behavior. A major problem that has been recognized and solved is that the sliding sleeve of the prior art hardly changes its inner circumference when the temperature of the pipe connection assembly changes. As a result, the pressed-in tube can not expand to the required extent in the circumference when heated, so that flow processes of the tube material in the axial direction or a plastic deformation of the tube and / or the support body occur. In particular, when temperature cycles with heating and subsequent cooling often follow each other, this permanently leads to the pressing force between the support body and the tube becoming smaller and smaller. This is the cause of the leaks observed in the prior art. The sliding sleeve designed according to the invention ensures that it can also change its circumference in the event of a temperature-induced expansion or contraction. The sliding sleeve can therefore "breathe", which is also referred to as a circumferential change effect.When heated, the sliding sleeve can thus increase in circumference.This allows the pressed tube to also expand in the circumference, so that the unwanted flow processes or plastic deformation are reduced or Even after many temperature changes, the tightness of the pipe connection assembly is retained in this way.

In a sliding sleeve according to claim 2, the inventive effect of changing the inner circumference is effected by the use of at least one radius change section. When expanded, this radius changing portion is stretched so that the circumference of the sliding sleeve can increase. In a thermal Zusammen¬ pull the sliding sleeve in the region of the radius change section is compressed, so that also a desired change in the inner circumference, namely a Verkleine¬ tion can take place. In order for the radius change section to have the desired circumferential change effect along the pressed-in tube end section, it must at least extend along the longitudinal axis of the sliding sleeve. A simultaneous extension portion transverse to this longitudinal axis is also possible. Forming the radius change section according to claim 3 avoids large local stress changes in the pressing area. This leads to a uniform pressing force, so that a uniform tightness of the pipe connection assembly results.

An aspect ratio according to claim 4 has been found to be particularly suitable for achieving a good sealing result. A larger Innenradiushub can füh¬ ren that locally the pressing force exerted by the sliding sleeve on the tube is too low. Too small a Innenradiushub results in that no sufficient stretching relationship or compression of the circumference of the sliding sleeve as a result of thermal Längenände¬ tion is possible.

A plurality of radius change sections according to claim 5 have been found to be particularly effective.

A sleeve wall according to claim 6 or 7 has manufacturing advantages and zu¬ leads to a uniform force profile.

The Aufschiebeabschnitte according to claim 8 or 9 have manufacturing advantages and also lead to better flexibility with a uniform force profile.

Radius change sections according to claims 10, 11 or 12 have been found to be particularly suitable alternative design options, which at the same time ensure a low-cost production with sufficient circumferential change effect.

A step according to claim 13 prevents slipping of the sliding sleeve from the support body. In particular, in the case of a sliding sleeve of metal, passage openings or blind openings in the inner wall of the sliding sleeve can also be designed to prevent the sliding sleeve from slipping off. A structuring of the inner surface to increase the friction of the sliding sleeve, for example in the form of a grain, may be provided as Abrutschsiche¬ tion.

Dimensional ratios according to claims 14 and 15 have, as regards the requirements on the pressing force absorption of the sliding sleeve, proven as a good compromise between stability, circumferential change effect and production cost. A sliding sleeve according to claim 16 can be manufactured inexpensively.

A sliding sleeve according to claim 17 can be made, for example, with a base body of polyphenylsulfone (PPSU). The stiffening support sleeve serves to displace the tube material when sliding the sliding sleeve.

Another object of the invention is to provide a tube assembly which remains tight even with frequent temperature changes.

This object is achieved according to the invention by a tube assembly having the features specified in claim 18. The advantages of this tube assembly correspond to those discussed above in connection with the inventive tube coupling assembly.

If a pipe is used according to claim 19 in the pipe assembly, comes as far as a sliding sleeve is used with at least one radius change section, yet another, the tightness of the pipe assembly fostering effect to wear. When sliding such a sliding sleeve on the metal-plastic composite pipe, the metal layer is plastically deformed by the radius change section. In this way, a radius change section is also formed in the metal layer, so that not only the sliding sleeve, but also the metal-plastic composite pipe is able to respond to a change in temperature with a corresponding Umfaπgsänderung, ie to "breathe." It can therefore do not come to the effect that the metal-plastic composite pipe, for example, during cooling of the tube assembly of a thermal Kontrak¬ tion of the support body can not follow, which, as recognized according to the invention, can lead to leakage of the pipe assembly.

A length dimensioning of the end portion to the support body according to claim 20 causes a Aufschiebeabschnitt the sliding sleeve with mounted pipe assembly, the tube does not surround, since the latter already ends a little way before the stop for the Schiebe¬ sleeve. Such an arrangement makes it possible to reinforce the push-on section of the sliding sleeve in such a way that the circumferential change effect is limited or absent. This is, as long as the Aufschiebeabschnitt no gripped by this umgener pipe section is also not required.

- A - A further object of the invention is to provide a sliding sleeve for the pipe connection assembly according to the invention or the pipe assembly according to the invention.

This object is achieved by a sliding sleeve according to claim 21. The advantages of the sliding sleeve have already been discussed above in connection with the pipe connection assembly and the pipe assembly.

Exemplary embodiments of the invention will be explained in more detail below with reference to the drawings. In this show:

Figure 1 shows a tube assembly with a support body and a sliding sleeve having pipe connection assembly and a tube, the Endab¬ section between the support body and the sliding sleeve can be pressed, before pushing the tube and the sliding sleeve on the support body.

2 shows an enlarged section through the tube according to line M-II in Fig. 1.

FIG. 3 shows the pipe assembly according to FIG. 1 in the assembled state; FIG.

Fig. 4 is an enlarged section along line IV-IV in Fig. 3;

Fig. 5 enlarges a half-cut side view of the sliding sleeve of

Pipe assembly according to Fig. 1;

6 shows a section along the line Vl-Vl in Fig. 5.

Fig. 7 is an enlargement of the section VII in Fig. 6;

Fig. 8 enlarges a half-cut side view of the sliding sleeve of

Pipe assembly according to Fig. 1;

FIG. 9 shows a section according to line VIII-VIII in FIG. 8; FIG. Fig. 10 is an enlargement of the detail X in Fig. 9;

Fig. 11 increases a further embodiment of a sliding sleeve in a to FIG.

5 similar view;

FIG. 12 shows a view of the sliding sleeve according to FIG. 11 in the direction of view IX in FIG. 11; FIG. and

13 to 16 similar to FIGS. 1 to 4 representations of a tube assembly with the sliding sleeve of FIG. 11th

1 to 4 show a first embodiment of a pipe assembly 1. FIGS. 3 and 4 show the pipe assembly 1 in the assembled state. Figures 1 and 2 show the tube assembly 1 in a state before the final connection assembly.

A pipe connection assembly of the pipe assembly 1 comprises a support body 2, which is also referred to as a fitting. The support body 2 is in the illustrated Ausführungsbei¬ game of metal. Also, a plastic version is possible. The support body 2 is a pipe connector and has a passage 3 for in the pipe assembly 1 to the leading fluid, for example water, on. The support body 2 is mirror-symmetrical to a center plane 4, which extends perpendicular to a longitudinal axis 5 of the support body 2. At its two free ends, the support body 2 each have a support portion 6. The two tubular support portions 6 have a total of four circumferentially about the longitudinal axis 5 extending outer retaining ribs 7. The center plane 4 towards the two support portions 6 are each bounded by a stop collar 8.

The pipe connection assembly further includes a sliding sleeve 9. FIGS. 5 to 7 and 8 to 10 show the sliding sleeve 9 in two embodiments in detail. This is in the embodiment of FIGS. 1 to 7 made of metal, for example steel. The sliding sleeve 9 is mirror-symmetrical to a median plane 10, which extends perpendicular to the longitudinal axis 5. A sleeve wall 11 of the sliding sleeve 9 has, at the edge in this embodiment, in each case a conically widening push-on section 12. However, it is also within the scope of the invention that the sliding sleeve has only one Aufschiebeab¬ section 12. Between the two Aufschiebeabschnitten 12, the sleeve wall 11 a total of twelve radius change sections 13 which extend as axial waves, ie parallel to the longitudinal axis 5. In the circumferential direction about the longitudinal axis 5, in the region of a radius change section 13, the inner sleeve radius R changes between a first, larger inner radius Rmax and a second, smaller inner radius Rmin. Each shaft therefore represents a radius change section 13 of the sliding sleeve 9. Due to the waveform, this radius change section 13 is shaped such that a continuous transition between Rmax and Rmin results. The sleeve wall 11 of the sliding sleeve 9 in this embodiment has a constant wall thickness S.

In a further embodiment according to FIGS. 8 to 10, the sliding sleeve made of metal, spielsweise of brass. The sliding sleeve 9 is mirror-symmetrical to a median plane 10, which extends perpendicular to the longitudinal axis 5. A sleeve wall 11 of the sliding sleeve 9 has in each case a conically widening Auf¬ push section 12 at the edge in this embodiment. These push-on sections 12 of the sleeve wall 11 have radius-changing sections 13, which are arranged adjacent to one another and extend as axial shafts, that is to say parallel to the longitudinal axis 5.

Between the two Aufschiebeabschnitten 12, the sleeve wall 11 a total of twelve radius change sections 13 which extend as axial waves, ie parallel to the longitudinal axis 5. In the circumferential direction about the longitudinal axis 5, in the region of a radius change section 13, the inner sleeve radius R changes between a first, larger inner radius Rmax and a second, smaller inner radius Rmin.

Each shaft of the sleeve wall 11 and the Aufschiebeabschnitte 12 therefore represents a Radius¬ changing section 13 of the sliding sleeve 9. Due to the waveform of this Rad¬ usänderungsabschnitt 13 is formed so that there is a continuous transition between Rmax and Rmin. In this embodiment, the sleeve wall 11 of the sliding sleeve 9 has a wall thickness S. which changes continuously from one push-on section 12 to the other push-on section 12.

Between the Innenradiushub Rmax - Rmin of the sliding sleeve 9 and an outer Radi¬ us Ra of the support body 2 is in the embodiment of FIGS. 1 to 4, a ratio of about 1:10 before. Other ratios, for example in the range between 1: 5 and 1:50, depending on the absolute value of Ra, possible.

In general, the larger the outer radius Ra of Stützkör¬ pers 2, the smaller the ratio. Between the thickness S of the sleeve wall and the outer radius Ra of Stütz¬ body 2 is in the embodiment of FIGS. 1 to 4, a ratio of about 1: 7 before. Other ratios, in particular between 1: 3 and 1:40, are possible. In general, the larger the outer radius Ra of Stützkör¬ pers 2, the smaller the ratio. Between the Innenradiushub Rmax - Rmin of the sliding sleeve 9 and the thickness S of the sleeve wall 11 is in the embodiment of FIGS. 1 to 4, a ratio of about 1: 1, 5 before. Other ratios, in particular between 2: 1 and 1:15, are possible. In general, the larger the radius Ra of the support body 2, and thus also the thickness S of the sleeve wall 11, is the smaller this ratio.

In addition to the pipe connection assembly comprising the support body 2 and the sliding sleeve 9, the pipe assembly 1 still has a pipe 14. This is a metal-plastic composite pipe. The tube 14 comprises an inner plastic layer 15, in the present exemplary embodiment of cross-linked polyethylene (PEX). The inner plastic material 15 is surrounded by a metal layer 16, which is also referred to as inliner. The tall¬ metal 16 is in the illustrated embodiment made of aluminum. Also steel comes as a material for the metal layer 16 in question. The metal layer 16 is in turn surrounded by a cover plate 17 made of a plastic, in this embodiment made of polyethylene. The cover layer 17 can also consist of a different polymer and in particular can also be crosslinked. On the cover layer 16 can also be dispensed with.

To prepare for the assembly of the tube assembly 1, an end portion 18 is expanded up to a Aufweitgrenze 19. The length of the flared end portion 18 up to the Aufweitgrenze 19 is less in an unillustrated embodiment of a tube assembly 1 as the length of the support portion 6 of the support body 2 up to the stop collar. 8

The tube assembly 1 is mounted as follows: First, the end portion 18 of the tube 14 is expanded to the Aufweitgrenze 19. This can be done mechanically, for example. Previously, the sliding sleeve 9 is pushed onto the tube 14 so far that the flared end portion 18 is not initially surrounded by the sliding sleeve 9. The support body 2, the tube 14 and the sliding sleeve 9 are then brought into position to each other, as shown in Fig. 1. Subsequently, the tube 14 is pushed onto the supporting portion 6 of the supporting body 2 facing it until the free end of the supporting portion 6 rests against the stop level formed by the widening limit 19. Subsequently, the sliding sleeve 9 is pushed onto the support portion 6 until the sliding sleeve 9 rests against the stop collar 8 of the support portion 6. This end position is shown in Fig. 3. When sliding the plastic material of the inner plastic läge 15 of the tube 14 between the sliding sleeve 9 and the support portion 6 is pressed. In this case, there is a material flow of the plastic material of the inner plastic layer 15 in the direction of the stop collar 8 of the support section 6. Due to the compression of the end section 18 of the tube 14 between the support section 6 and the sliding sleeve 9, the support section 6 exerts on the end section 18 of the tube 14 a pressing force extending in the radial direction. Likewise, the end portion 18 of the tube 14 exerts on the sliding sleeve 9 a pressing force extending in the radial direction.

When the sliding sleeve 9 is pushed onto the end section 18 of the tube 14, plastic deformation of the metal layer 16 takes place on the end section 18 due to the circumferentially undulating force application of the radius change sections 13. The latter also assumes a wave shape when the sliding sleeve 9 is slid open which follows the shape of the radius change sections 13. This is shown in FIG. 4.

With an increase in temperature of the pipe assembly 1, for example, as a result of Durch¬ flow of hot water through the pipe assembly 1, the support body 2, the tube 14 and the sliding sleeve 9 expand due to their respective positive coefficient of linear expansion. Due to the wave shape of the metal layer 16 in the region of the end section 18 on the one hand and the sleeve wall 11 in the region of the end section 18 on the other hand, this longitudinal extension leads to an increase in the circumference of the metal layer 16 on the one hand and the sliding sleeve 9 on the other hand. The inner plastic would be 15 and the support section 6 can thus also expand and increase their scope accordingly. During this expansion due to a heating of the tube assembly 1, all planar pressing contacts between the support section 6, the tube 14 and the sliding sleeve 9 are retained. The tightness of the tube assembly 1 is maintained.

With a temperature reduction, for example due to the flow of cold water through the tube assembly 1, a length contraction and concomitant circumferential reduction of the support portion 6, the end portion 18 of the tube 14 and the sliding sleeve 9 can take place accordingly. In particular, the corrugated sleeve wall 11 of the sliding sleeve 9 and the corrugated metal layer 16 can reduce their circumference in this contraction, so that the pressing contact of these components to one another and also the inner plastic layer 15 to the support section 6 is maintained. Even with a reduction in temperature, therefore, the areal pressing force between these components and thus the tightness of the tube assembly 1 are preserved. This also changes nothing if the tube assembly 1 passes through many cycles with a temperature increase and subsequent temperature reduction.

An alternative embodiment of a sliding sleeve 20, which can be used instead of the sliding sleeve 9 in the tube assembly 1, are shown in FIGS. 11 and 12.

The sliding sleeve 20 has a main body 21 made of plastic, in the present embodiment Ausfüh¬ from polyphenylsulfone (PPSU). An end portion of the main body 21 is au¬ ßen surrounded by an adjacent reinforcing ring 22 made of metal. The inner wall of the main body 21 has a total of twelve axially extending radius change sections 23, which are adjacent to each other, designed as grooves and merge into one another such that an inner shaft structure as in the shafts 13 of the sliding sleeve 9 of Ausfüh¬ tion of FIG .. 1 to 10 results. At the end facing away from the reinforcing ring 22, a recess 24 is arranged in each case in the transition region between two adjacent radius change sections 23, so that the inner radius of the main body 21 increases from the recess 24 to the transition region between two adjacent radius change sections 23 via a transverse step 25.

In the region of the reinforcing ring 22, the base body 21 has a conically expanding push-on section 26, which is shaped similarly to the push-on sections 12 of the sliding sleeve 9.

But it is also within the scope of the invention that the Aufschiebeabschnitte 26 of the body 21 have radius change sections 23 which are arranged adjacent to each other and, for example, as axial waves, ie parallel to the longitudinal axis of the main body 21 of the sliding sleeve 20.

The assembly of the sliding sleeve 20 according to FIGS. 11 and 12 having tube assembly 1 will be described below only where it differs from the above beschriebe¬ nen assembly of the embodiment of FIGS. 1 to 7. The corresponding tube assembly 1 with the sliding sleeve 20, Figs. 15 and 16 in the assembled state and Figs. 13 and 14 in a state before the final connection assembly. The sliding sleeve 20 is pushed onto the tube 14 in such a way that the push-on section 26 points towards the support body 2. After pushing the tube 14 onto the support body 2, the sliding sleeve 20 is pushed onto the tube 14 and the support body 2. The displacement of the plastic material of the inner plastic läge 15 is effected by the leading portion of the sliding sleeve 20 with the reinforcing ring 22. This leading portion of the sliding sleeve 20 also causes the undulating deformation of the metal layer 16 in accordance with what has been described above in connection with the assembly of the embodiment according to FIGS. 1 to 10.

The steps 25 serve as a slip-off to prevent slippage of the sliding sleeve 20 from the support body 2. The thermal behavior of the tube assembly 1 with the sliding sleeve 20 corresponds to what has been described above in connection with the embodiment of FIGS. 1 to 10. The sliding sleeve 20 may, where it is not surrounded by the reinforcing ring 22, expand at a temperature increase so that their scope can increase. This expansion can, as already described above, follow the tube 14 due to the corrugated metal layer 16. The tube assembly 1 with the sliding sleeve 20 remains tight in a variety of temperature variations or - cycles, since the inner wall of the sliding sleeve 20 by changing the inner circumference of the sliding sleeve 20 a change of aus¬ by the tube 14 on the sliding sleeve 20 aus¬ practiced, can follow in the radial direction pressing force.

The radius change sections 13 in the form of the shafts in the embodiment of the sliding sleeve 9 according to FIGS. 1 to 10 and in the form of the grooves in the embodiment of the sliding sleeve 20 according to FIGS. 11 and 12 extend parallel to the longitudinal axis of the respective sliding sleeve ,

In embodiments of sliding sleeves, not shown, waves, grooves or otherwise shaped radius change sections 13, 23 extend in such a way that, in addition to an extension component along the longitudinal axis 5, they also have a further extension component transverse to the longitudinal axis 5. The radius-changing sections 13, 23 can, for example, run in the form of a helical coil or a thread with a large pitch. Sliding sleeves with such radius change sections 13, 23 are accordingly turned on or screwed onto the support body when pushed onto the support body along these radius change sections 13, 23.

The tube assembly 1 can be used in the heating and sanitary sector. Other uses of the tube assembly 1 are of course possible.

- Claims -

Claims

claims

1. pipe connection assembly with a support body (2), with a on the support body (2) pushed in such a sliding sleeve (9; 20) that between the support body (2) and the sliding sleeve (9; 20) has an end portion (18) of a Pipe (14) can be pressed,

characterized,

that the sliding sleeve (9; 20) is designed in such a way that an inner wall of the sliding sleeve (9, 20) changes in radial direction by changing the inner sliding sleeve circumference of a change in the force exerted by the tube (14) on the sliding sleeve (9; Direction can be followed by running pressing force.

2. Pipe connection assembly according to claim 1, characterized in that the sliding sleeve (9; 20) has at least one radius change section (13; 23), in which the inner sleeve radius in the circumferential direction between a first, larger inner radius (Rmax) and a second , smaller inner radius (Rmin) changes and at least along the longitudinal axis (5) of the sliding sleeve (9; 20) er¬ stretches.

3. Pipe connection assembly according to claim 2, characterized in that the radius change section (13; 23) is formed so that a continuous transition between the larger inner radius (Rmax) and the smaller inner radius (Rmin) results.

4. Pipe connection assembly according to claim 2 or 3, characterized by a Ver¬ ratio between the Innenradiushub the sliding sleeve (9; 20) (Rmax - Rmin) and the outer radius (Ra) of the support body (2) between 1: 5 and 1 : 50, especially in the range of 1:10.

5. Pipe connection assembly according to one of claims 2 to 4, characterized by a plurality of radius change sections (13, 23).

6. Pipe connection assembly according to claim 5, characterized in that the sliding sleeve (9; 20) has a sleeve wall (11; 21), in which the radius change sections (13; 23) are arranged successively in the circumferential direction.

7. Pipe connection assembly according to claim 5, characterized in that the sliding sleeve (9; 20) has a sleeve wall (11; 21), in which the radius change sections (13; 23) are arranged adjacent to each other.

8. Pipe connection assembly according to claim 5, characterized in that the sliding sleeve (9; 20) Aufschiebeabschnitte (12, 26), in which the Radiusände¬ approximately sections (13; 23) are arranged adjacent to each other.

9. Pipe connection assembly according to claim 5, characterized in that the sliding sleeve (9; 20) Aufschiebeabschnitte (12, 26), in which the Radiusände¬ tion sections (13; 23) are arranged sequentially in the circumferential direction.

10. Pipe connection assembly according to one of claims 2 to 9, characterized gekenn¬ characterized in that the radius change sections (13, 23) as grooves in the wall of the sliding sleeve (9, 20) are executed.

11. Pipe connection assembly according to one of claims 9 to 10, characterized gekenn¬ characterized in that the radius change sections (13, 23) as waves in the wall of the sliding sleeve (9, 20) are executed.

12. Pipe connection assembly according to claim 11, characterized by a corrugated sleeve wall (11) with in particular axially extending shafts.

13. Pipe connection assembly according to claim 10 or 11, characterized in that at least one radius change sections (13, 23) has a transverse step (25), in which counter to the slip-on of the sliding sleeve (9; 20) of the inner radius of this increases.

14. Pipe connection assembly according to one of claims 1 to 13, characterized by a ratio between the thickness (S) of the sleeve wall (11) and the outer radius (Ra) of the support body (2) in the range between 1: 3 and 1:40 , in particular in the range of 1: 7.

15. Pipe connection assembly according to one of claims 1 to 14, characterized by a ratio between the Innenradiushub the sliding sleeve (9; 20) (Rmax - Rmin) and the thickness (S) of the sleeve wall (11) in the range between 2: 1 and 1: 15, in particular in the range of 1: 1, 5.

16. Pipe connection assembly according to one of claims 1 to 15, characterized by a sliding sleeve (9) made of metal.

17. Pipe connection assembly according to one of claims 1 to 16, characterized by a sliding sleeve (20) having a base body (21) made of plastic, on which the at least one radius change section (23) is executed, and an outer, the main body (21). partially surrounding reinforcing ring (22) made of metal.

18. Pipe assembly (1) with a pipe connection assembly according to one of claims 1 to 17 and with a tube (14) having an end portion (18) between the support body (2) and the sliding sleeve (9, 20) einpressbar is.

19. Pipe assembly according to claim 18, characterized in that the tube (14) is a metal-plastic composite pipe and an inner plastic Läge (15) and a surrounding metal layer (16).

20. Pipe assembly according to claim 18 or 19, characterized in that the End¬ section (18) opposite the other tube (14) is widened, wherein the length of the flared end portion (18) is smaller than the length of a support portion (6 ) of the support body (2) between a free Aufschiebende and a stop (8) for the sliding sleeve (9; 20).

21. Sliding sleeve for a pipe connection assembly according to one of claims 1 to 17 or for a pipe connection assembly according to one of claims 18 to 20.