HK1035771A - Tube connection between a collector of a motor vehicle heat exchanger and an exterior line - Google Patents

Description

Pipe connection between collector and external pipe of heat exchanger of motor vehicle

The present invention relates to a pipe connection between a collector of a heat exchanger of a motor vehicle and a line for feeding an internal heat exchange fluid to or from the collector, having the further features outlined in claim 1. Such a pipe joint is in accordance with the applicant's internal prior art.

The invention further relates to a novel method for producing such a pipe connection, having the features of claim 14.

According to the applicant's internal prior art mentioned above, it is common to use an O-ring as a seal between the connecting nipple of the collector and the pipe. Such an O-ring is first fitted on the free end of the pipe and the pipe is then pressed into the other cross section between the pipe and the connecting stub remote from the collector, whereby, ideally, under the effect of the surface pressure of the O-ring, depending on the size of the other cross section remote from the collector, a contact of the outer flange on the connecting stub with the outer bead of the pipe can be achieved. However, in an unfavorable case, a section of the O-ring will be partially clamped in the intermediate space between the outer flange and the outer bead. This can lead to premature failure of the O-ring and also to failure of the seal due to the diminished sealing function inherent to the O-ring. If the O-ring is not properly mounted, or merely because of tolerances, then when the connection piece and the line are displaced relative to one another, the displacement is hindered only by the O-ring deforming in an undesired manner, so that the desired end position of the pipe connection cannot always be reliably obtained. This function is also impaired in that the O-ring on the inner surface of the connecting piece must slide into another cross section remote from the collector, but the latter inner surface often transitions to the outer flange with an undesired curvature within tolerances and, in addition, often changes the surface to an extent that influences the friction through lateral diffusion of the flowing medium. When the O-ring is moved over the free end of the line, it can additionally produce an undesired twisting and positional tilting of the O-ring, so that even in the ideal case it bears with its rear face on the outer bead. This adverse effect can only be controlled considerably when a large mounting force is applied; however, there is still the risk that the O-ring is undesirably deformed and that the deformation zone of the O-ring penetrates into the space between the outer bead and the outer flange. The difficulty of the known method is further increased by the fact that the connecting clip, which is usually used to obtain a final mutual pressing of the outer flange and the outer bead with the inserted O-ring, can only be installed with the outer flange and the outer bead being gripped all around during the final installation of the pipe connection, if they are in close contact with one another and are not forcibly separated by a closed foreign body, such as an undesirably deformed O-ring section. At this point, a failed pipe joint is obtained that can be found and discarded as a waste product. However, when the outer flange is in the desired tight connection with the outer bead, this tight connection must still always be maintained with special tools when the joining clip is installed. In manual installation, as is usual for example in repair work or maintenance work, it is necessary to use two hands to install the clamp, without one hand being available for holding the tube or special auxiliary tools such as pliers or lamps.

The object of the invention is to design a pipe connection of the type mentioned above such that it can be installed easily and reliably with only one hand or with a tool having a corresponding function, without the risk of connection failure, and without the tendency to try to separate again automatically after installation, before the clamping device, such as a connecting clamp or the like, is installed.

This object is achieved by the general features of claim 1.

As is particularly clear from the preferred production method according to claim 14 (with suitable refinements according to claim 15, these two features are preferably realized in double), the seal according to the invention is not inserted on the free end of the pipe connection, as is the case with the O-ring used hitherto, but rather is inserted in the connecting pipe on the collector, here in a clear cross section remote from the wide cross section of the collector. This has the advantage that, during such a pre-assembly, neither the rough surface on the inside of the connecting piece nor the disadvantageous curved geometry present there has an effect on the use of the seal, since the pre-assembly does not occur as a result of compression. In the final state of the pipe connection, the sealing part between the outer flange of the connection stub and the outer bead of the pipe, i.e. its sealing flange, is then deliberately clamped.

Since the type of seal discussed here, i.e. the seal which is now an O-ring seal or the form according to the invention, is composed of an elastomer material which is comparatively pressure-resistant, the final state of the pipe connection can still be adjusted precisely, with compensation for tolerances, by the contact of the sealing flanges between the outer flange and the outer bead on their surfaces facing one another. If at least one sealing element is formed on the plug sleeve of the seal, which sealing element corresponds to an O-ring of conventional design, then, in contrast to conventional sealing with O-rings, no functional disadvantages are to be taken into account in the pipe connection according to the invention, in which case all of the abovementioned disadvantages can be avoided. This is particularly important because a pipe connection of the type in question is relatively difficult to access in the sense of mass-produced items, which are arranged completely in the floor space of the motor vehicle in mass production.

In particular, the following advantages are also to be particularly emphasized: since the effective sealing element is arranged in the plug sleeve in the manner of an O-ring in the prior art, the sealing element is not rotated in the circumferential direction of its cross-section, as occurs in conventional O-rings when shear forces occur, which would lead to premature aging. In the final installation of the pipe connection, which can be carried out with a low axial installation force, this installation force is therefore also particularly low, since, when the free end of the pipe line is inserted into the plug-in sleeve and, if necessary, into the narrow cross section of the connection piece close to the collector, the plug-in sleeve can be extended axially and can thus be deformed in the direction of extension during the plug-in movement without, as in the known O-rings, obtaining a lateral expansion which generates resistance. It is particularly important that, during pre-installation, in the enlarged cross-section between the connecting pipe and the free end of the pipe, at its final sealing point, a sealing element is placed instead of an O-ring and is not pressed in this enlarged cross-section only during final installation. Finally, the pipe coupling according to the invention is also relatively reliable, taking into account the risk of forgetting the seal once the structure is installed. In the previously known case, the application of an O-ring seal still results in a temporary, purely metal leak-proof between the outer flange of the outer connecting stub and the outer bead of the pipe, which, however, is not durable in the long term. In the pipe connection according to the invention, the clamping means provided for the final clamping, for example the connecting clamp, are initially adjusted in the order of the outer flange, the sealing collar, the outer bead, and, if the seal according to the invention is not inserted, no leakage gap is allowed between the outer flange and the outer bead, which plays a role in leakage.

In addition, in the pipe connection according to the invention, there are further advantageous developments according to the dependent claims. Here, some particularly important improvements are highlighted below:

further sealing elements can be provided as required on the plug sleeve, on the sealing collar and in the transition region of the sealing collar and the plug sleeve (see in particular claims 6 and 7). In this case, a radially acting sealing element or an axially acting sealing element can be distinguished and, if necessary, both types can be used.

Furthermore, for partial sealing, planar seals can additionally also be provided (see in particular claims 10 and 11). However, in the case of planar pressing, it is to be noted that the components which interact with one another have inherent tolerances in each case, so that a surface compression cannot always be reliably achieved and, if appropriate, a capillary gap is formed. In order not to cause a more or less permanent leakage under the action of capillary forces, the seal according to the invention is preferably also provided with a capillary stop in the area of the surface contact, or with an opposing abutment only (see claim 12).

In addition to the further sealing action required, the transition of the plug sleeve into a wedge shape of the sealing collar and/or the spring back (ruecksprbung) on the sealing collar which overlaps the outer flange (see claims 11 and 13) is particularly useful in that, in the event of particularly unfavorable installation, the plug sleeve with the sealing collar is forced into a wide cross section in the connecting stub remote from the collector.

The invention will be explained in more detail below with reference to schematic drawings of a number of embodiments. In the figure:

fig. 1 shows a cross section of a pipe connection between a collector of a heat exchanger of a motor vehicle and a line for an internal heat exchange liquid of the collector, with a connecting clip fitted together;

fig. 2 shows a radial section through a first embodiment of a virtual arrangement of a pipe connection without a clamping device, wherein the first embodiment of the seal, which is still in the uncompressed state at the beginning, is arranged mainly between the two parts when the pipe line is superposed on the connecting stub of the collecting vessel;

fig. 2a shows a radial cross-section comparable to fig. 2, in which the same seal as in fig. 2 is compressed in the final state of the pipe connection and is held in the compressed state by a connecting clamp;

fig. 3 and 3a show a radial section through a second or third embodiment of a seal comparable to fig. 2 and 2a, respectively; and

fig. 4, 4a and 4b show, respectively and in a schematic radial sectional view of a pipe connection, an illustration of the internal prior art situation in the case of an O-ring, wherein fig. 4 is a first installation phase of a pressed O-ring, fig. 4a is a desired final phase of the pressed O-ring, and fig. 4b is a typical intermediate or final phase of an O-ring with a failed press.

First, a conventional construction of a pipe joint, the seal of which is configured according to the invention, will be described with reference to fig. 1.

The collector 2 of the motor vehicle heat exchanger is assembled in two parts from a tube base 4 and a cover 6 of the motor vehicle heat exchanger. The base 4 has a flanged edge 8 to which the pan-shaped cover 6 of the collector 2 is soldered. At the tube bottom 4, an inwardly bent collar 10 can be seen, to which the flat tubes of a motor vehicle heat exchanger, not shown, are likewise joined with brazing at their ends. This generally relates to collectors for flat tube heat exchangers of conventional construction, which need not be described in further detail.

The collector 2 serves to convey the heat-exchange liquid inside the motor vehicle heat exchanger to the flat tubes or, after flowing through the flat tubes, to be discharged again from the collector. In this case, it may be an inlet collector, an outlet collector, or a collector combining the functions of the inlet collector and the outlet collector in the case of using a partition wall, not shown, in which case the other ends of the flat tubes need only be connected to each other in a flow-wise fashion in an arrangement of multiple flow passages.

Heat exchange tubes having other cross-sections may also be employed in place of the flat tubes.

The cover 6 of the collector 2 has an outwardly facing edge 12, into which a single connecting piece 14 is inserted again by soldering. Alternatively, the connecting piece 14 can also be integrated with the collector 2 or its cover 6.

The connecting piece 14 communicates with a line 16 which, depending on the inlet function or the outlet function, feeds the heat exchange fluid inside to the collector 2 or leads it away from the collector 2.

The connecting piece 14 is stepped twice in its cross section in the direction of the pipe 16, with a correspondingly symmetrically enlarged inner cross section. In the region of the first step 18, the free end of the line 16 facing the collector 2 is in its entirety engaged therewith or, as shown, with a portion of the tube wall. In the region of the outward, likewise symmetrical, further enlarged second step 20, an annular gap 22 extending in the circumferential direction is formed with the outer wall of the pipe 16, which wall has a constant cross section here, between an inner surface 24 of the connection stub 14 and an outer surface 26 of the pipe 16, in order to at least partially receive an annularly encircling seal 28. In the region of the first step 18, the connecting stub 14 thus has a small cross section 30 close to the collector, to which the free end 32 of the line 16 engages in a form-fitting manner, while in the region of the second step 20 the connecting stub has a wide cross section 34 remote from the collector, which serves to form the annular gap 22 in the manner already described.

The pipe 16, which in the context described here has a generally constant outer cross section, is provided with an outer bead 36 obtained by longitudinal upsetting, which has the characteristic of an annular flange and in the region of the flange projecting outwards beyond the outer surface of the pipe 16, the outwardly projecting original pipe wall sections obtained by upsetting bear very tightly against one another in the case of the formation of a heavy wall.

The outer bead 36 functionally interacts as a face flange of the line 16 with an outer flange 38 on a free end 40 of the connecting piece, which is formed outwardly as a circumferential bead of this free end. The outer flange 38 and the outer bead 36 now have the same outer diameter without loss of generality, wherein a certain offset is allowed to be maintained.

The connecting clip 42 serves to permanently clamp the outer flange 38 provided with the outer end face 41 on the connecting stub 14 and the outer bead 36 on the line 16 to one another in the final installation state.

In the case of the pipe connection according to fig. 1, according to the internal prior art, the O-ring of the seal, which is then the pipe connection, is initially moved undeformed on the free end of the line 16 into contact with the outer bead 36. In order to obtain a good radial compression in the annular gap 22, the O-ring in the undeformed state has a diameter which is greater than the radial diameter of the annular gap. The pipe 16 with the O-ring is then moved into the connecting piece 14, at which point the free end 32 of the pipe already engages the region of the first step 18 of the connecting piece 14 when the O-ring is initially pressed. This intermediate stage of the installation is illustrated in fig. 4, in which the O-ring provided as the seal 28 has undergone a deformation on the outer flange 38 at the rounded transition shoulder of the inner surface 24 of the second step 20 of the connecting stub 14, which deformation has partly an elongation in the annular gap 22 in the desired manner and partly a slight elongation in the intermediate space between the outer flange 38 and the outer bead 36 in an inherently undesirable manner. In the desired end state of the pipe connection, the entire O-ring is then pressed in the final state of the pipe connection according to fig. 4a, wherein the end face 41 of the outer flange 38 is in direct contact with the end face of the outer bead 36 facing it, while the O-ring is pressed completely in the radial compression in the annular gap 22 between the inner surface 24 of the connection stub 14 and the outer surface of the free end 32 of the line 16. In contrast, fig. 4b shows a typical failed pipe connection, in which the O-ring does not actually extend predominantly along the annular gap 22 as in the previous installation stage according to fig. 4, but is rather compressed between the outer flange 38 and the outer bead 36 in a considerable section, with the result that these two parts can no longer be brought into direct contact with one another, cannot be compressed again with a connecting clip 42 which only bridges a limited compression region, and the radial sealing function is largely eliminated.

In the pipe connection according to the invention and correspondingly in the three embodiments of fig. 2, fig. 3 and 3a with the addition of fig. 3a, the sealing element 28 has a plug-in sleeve 44 and a sealing collar 46 arranged at one end thereof. In the region of the other end of the plug sleeve 44, a first sealing element 48 is formed in its circumferential direction, which is configured differently in fig. 2, 3 and 3 a. Two or more first sealing elements 48 may also be made along the plug sleeve in a manner not shown. All these first sealing elements should have the function of an internal state-of-the-art O-ring, i.e. of a radial seal by radial pressurization in the annular gap 22 between the connecting nipple 14 and the line 16.

Again, the sealing flange 46 already assumes the function of a further axial seal between the outer flange 38 and the outer bead 36. In all three exemplary embodiments shown, in order to increase the axial sealing action, a second sealing element 52, which projects outward in the non-compressed state beyond the end face 50 of the sealing flange 46, is also formed on the sealing flange 46, if not in the extension of the central cross-sectional area of the plug-in sleeve 44, and can also be provided in a plurality, usually radially further outward, on the end face 50 and/or on the rear side of the sealing flange 46, as is shown by the second sealing element 52a in fig. 3. In fig. 3, three first sealing elements 48a, 48b and 48c are also formed axially along the plug sleeve 44, wherein the first sealing elements 48b and 48c are protruding annular projections which surround radially on the inside.

The first sealing element 48a from fig. 3 shows that it can itself completely assume the cross section of a conventional O-ring, which is not separated here, but is formed together at the free end of the plug sleeve 44 remote from the sealing flange 46.

However, due to the additional sealing possibility in the seal 28 according to the invention, the radial compression of the first sealing element can be reduced compared to a separate O-ring, so that the radial sealing action thereof is reduced. A first mitigation possibility is shown in fig. 2. Here, the cross section of the O-ring at the free end of the plug sleeve 44 is cut out in a truncated radial end face 54. In this case, the remaining contour of the O-ring still extends radially inwardly, while it is reduced further radially outwardly, in the form of an axially encircling narrow annular projection. Alternatively, the configuration can be exchanged radially inward and radially outward, or further modifications can be made to the cross-section of the O-ring.

However, in the embodiment of the first sealing element 48 described and mentioned as a variant, it is also possible to provide a more or less projecting solid section of this first sealing element (shown in fig. 3 a) or even a concave configuration according to fig. 3a on the end face. The cross-sectional shape of fig. 2 is then further modified by the concave configuration of the end faces in such a way that the contact pressure is relieved in the radial direction in such a way that a sealing lip 56a or 56b is formed radially inward and radially outward, respectively. The two sealing lips will be pressed against the inner surface of the annular gap 22 by internal pressure by means of the recessed recesses of the end faces. However, the recesses in solid cross-section cannot be used to such an extent that the radially outward pretensioning is completely eliminated. Rather, this radially outward pretension is still present to such an extent that, even in the event of problematic underpressure during operation, sufficient radial pressure is still ensured in the space 58 to be sealed against the mutually opposite surfaces 24 and 26 of the annular gap 22.

In all three exemplary embodiments, the plug sleeve 44 transitions from the second step 20 in the connecting stub 14 to the sealing collar 46 with a wedge-shaped enlargement corresponding to the circular arc of the connecting stub 14. As can be seen from fig. 2, the plug sleeve 44 further has, at its radially inner surface 60, a tapering from the rounded transition of the sealing collar 46 to, for example, the free end of the plug sleeve 44.

The first sealing element 48, or in the case of a plurality of first sealing elements, the first sealing element 48a closest to the collector, generates, completely or approximately, a radial thickness compression which is 20% to 40% of the radial dimension of the annular gap 22. It also corresponds to the usual radial compression in conventional O-rings and remains within the lower limits in the embodiment of fig. 3 a.

In contrast, the radial compression on the inside of the other first sealing elements 48b and 48c according to fig. 3 is only small on a single side, but is still substantially greater than 0%. Subsequently, a surface compression, which is additionally typically in the range from 0% to 20%, is effected on the individual first sealing element 48 or the first sealing element 48c which is further away from the collector, in the wedge region of the transition of the plug sleeve 44 to the sealing flange 46. In case of unfortunate (partial) overlap of tolerances, then this face compression may be completely or approximately zero at this point, or even a small amount of free play may be created. In all these cases, there is a risk of capillary currents along the desired face-compacting zone. In order to block the leakage caused by capillary forces, a radially outward (optionally instead of or in addition to this, not shown) annular capillary stop 62, which is designed as a groove extending in the circumferential direction on the outer surface of the seal 28, is arranged next to it in the direction of the sealing collar 46 in the axial direction in the manner shown.

In the final connected state of the pipe connection, unlike with conventional O-ring seals, no direct contact of the outer flange 38 on the outer bead 36 occurs, but the sealing bead 46 remains between them, as shown in fig. 2 a. Due to the axial pressing force of the pipe connection in the end position, the sealing collar is slightly pushed radially outward, as is clearly shown by the radially outward bulge 64 in fig. 2 a.

Fig. 2, together with fig. 2a, now describes the very normal annular flange configuration of the sealing flange 46. It is also suitable for the second embodiment as shown in fig. 3. In this case, the sealing flanges are each only improved by the arrangement of at least one second sealing element. According to fig. 3a, on the side of the sealing flange 46 facing the collector, at its radially outward end, a resilient part (ruecks pruneg) 66 is provided, which normally surrounds radially, but can be divided into circumferentially distributed segments. Likewise, the resilient portion may have a cross-section different from rectangular, as opposed to fig. 3 a. It is important that it can surround the outer flange 38 of the connecting stub 14 on the outside.

In the pipe joint according to the invention, a typical mounting is as follows:

the plug sleeve 44 of the seal 28 is initially moved as far as possible over the entire extent of the second step 20 on the connecting stub 14 until the side of the sealing collar 46 facing the collector preferably comes into contact with the free end face 41 of the outer flange 38. The line 16 is then inserted into the plug sleeve 44 and preferably also until the outer bead 36 comes into contact with the free end face 50 of the sealing collar 46. In comparison with the conventional O-ring arrangement described with reference to fig. 4 to 4b, it is possible to obtain a satisfactory pipe joint with a high sealing function with a much lower installation force and with much greater reliability, without inadvertently forgetting to insert the sealing element 28. Thus, in the final pipe joint state, the final installation state can be secured with the joining clip 42 or other clamping means without the need for considering the forces again trying to separate when neglecting the comparatively small deformation forces of the sealing flange 46, as is the case with O-rings, which can be clearly seen by the radial outward camber 64 in comparison with fig. 2 and the circumference 2 a. When the mounting process differs from the case of an O-ring, the plug sleeve 44 does not actually change its position in the annular gap 22 until the above-mentioned axial extension is reached.

In general and in particular in all three embodiments, the radial pressing-on can be further promoted by the fact that, in the region of the first step 18 of the connecting stub 14, a radially inwardly extending step 68 is also formed on the free end 32 of the line 16, which preferably has a slope with a small setting angle, typically 10 ° to 20 °, over which the transition shoulder of the first step can enter the second step of the connecting stub 14 when the plug sleeve 44 is pressed radially. Furthermore, the free end 32 of the line 16 is provided on the outside with an edge 70 which serves as a lead-in ramp, so that the latter is not damaged by the plug sleeve 44 when it is introduced therein.

Claims (15)

1. Pipe connection between a collector (2) of a heat exchanger of a motor vehicle and a line (16) for feeding the heat exchange fluid inside to the collector (2) or leading out of the collector (2), wherein:

the connecting pipe (14) projecting outwards on the collector (2), which is made of aluminum or aluminum alloy in particular, has a narrow cross section (30) close to the collector and a wide cross section (34) remote from the collector, with which the free end (32) of the line (16) engages in a form-locking manner, the wide cross section forming an annular gap (22) between the inner surface (24) of the connecting pipe (14) and the outer surface (26) of the line (16) for partially receiving a sealing element (28) which surrounds the line (16) in an annular manner and has a (first) sealing element (48; 48a, b, c), which has the function of an O-ring in particular, and is sealed against both internal overpressure and internal underpressure;

an outer flange (38), in particular as a circumferential bead, is arranged at the free end (40) of the connecting stub (14); and

in a pipe (16), in particular consisting of aluminum or aluminum alloy, which has an outer diameter in the range of 15 to 22mm and a wall thickness of 0.7 to 2mm, an outer upset bead (36) is formed opposite the outer end face (41) of the outer flange (38), which is pressed against the outer end face (41) of the outer flange (38) in the final installed state of the pipe connection by means of a clamping device, in particular a connecting clamp (42),

characterized by, the sealing member (28)

Forming a plug sleeve (44) engaging the wide cross-section (34) remote from the collector side;

in its circumferential region close to the collector, a (first) sealing element (48; 48a, 48b, 48c) is formed; and

in its peripheral region remote from the collector, a sealing flange (46) is provided, which is tightened axially between the outer flange (38) of the connecting stub (14) and the outer bead (36) of the line 16 by means of a clamping device (42).

2. A pipe connection according to claim 1, characterized in that a (first) sealing element (48; 48a, 48b, 48c) is formed at the end of the plug sleeve (44) which is close to the collector and/or a sealing flange (46) is formed at the end which is remote from the collector.

3. A pipe connection according to claim 1 or 2, characterized in that the (first) sealing element for radial compression, which has a transition slope on the plug sleeve (44), expands radially outwards and/or radially inwards in cross section in the direction of the collector (2).

4. A pipe-fitting according to claim 3, wherein the (first) sealing element (48, 48a) is formed as an O-ring.

5. A pipe connection according to claim 3, characterized in that the (first) sealing element (48) forms a pair of radially inward and radially outward sealing lips (56a, 56b) which can be acted on by pressure from the inside on the collector side, wherein the radially inward sealing lip (56a) has a radial pretension radially inward against the pipe (16) and the radially outward sealing lip (56b) has a radial pretension radially outward against the connecting stub (14).

6. A pipe-fitting according to any one of claims 1 to 5, characterized in that the plug-in sleeve (44) is provided with an axial set of at least two (first) sealing elements (48a, b, c).

7. A pipe connection according to one of claims 1 to 6, characterized in that at least one second axially compressible, partially circumferential sealing element (52, 52a) is formed on the sealing flange (46) of the seal (28) and/or in the transition region of the sealing flange (46) to the plug-in sleeve (44).

8. A pipe-fitting according to claim 7, characterized in that the second sealing element (52, 52a) is formed as a projection only in the axial direction.

9. A pipe-fitting according to claims 7 and 8, characterized in that there are a pair of projections (52, 52a), one of which (52) is arranged with respect to the outer bead (36) and the other projection (52a), which is preferably positioned radially further outwards, is arranged with respect to the outer flange (38).

10. A pipe connection according to any one of claims 1 to 9, characterized in that the plug sleeve (44) is arranged with a radial surface compression at least in the transition between the sealing flange (46) and the sealing element (48c) closest to the collector or, if there are a plurality of first sealing elements (48a, b, c), the sealing element (48c) furthest from the collector.

11. A pipe connection according to one of claims 1 to 10, characterized in that the outer contour of the plug sleeve (44) which merges into its sealing collar (46) is matched in a wedge-shaped manner to the gradually expanding inner contour of the connection stub (14) which merges into its outer flange (38).

12. A pipe coupling according to claim 10 and, where appropriate, claim 11, characterized in that capillary interruptions (62) are provided in the area of the surface pressure and/or in the contact area between the outer contour of the plug sleeve (44) and the inner contour of the connecting piece (14).

13. A pipe-fitting according to any one of claims 1 to 12, characterized in that a preferably circumferential resilient portion (66) of the sealing flange (46) is formed in the outer edge region of the sealing flange (46), which extends to the outer edge of the outer flange (38).

14. Method for producing a pipe connection according to one of claims 1 to 13, characterized in that the sealing element (28) is first inserted with its plug-in sleeve (44) into the free end of the connection stub (14), then the free end of the pipe (16) is inserted into the plug-in sleeve (44), and then the sealing collar is clamped between the outer flange (38) of the connection stub (14) and the outer bead (36) of the pipe (16).

15. Method according to claim 14, characterized in that the plug-in sleeve (44) of the seal (28) is inserted into the connecting stub (14) until the sealing flange (46) comes into contact with the outer flange (38) and/or the pipe (16) is inserted into the plug-in sleeve (44) of the seal (28) until the outer bead (36) of the pipe (16) comes into contact with the sealing flange (46).