DE29501646U1 - Pipe component - Google Patents

Description

Pipe component

The invention relates to a pipe component for fixing to the end of a pipe, in particular a gas pipe made of plastic, according to the features in the preamble of claim 1.

In order to connect pipes to one another or to enable the transition to other pipe components, such as house connection fittings, pipe branches or reducers, these are equipped with a flange connection at the end.

A common pipe connection, especially for gas pipeline networks made of plastic pipes, is known from DE-PS 29 11 708. In this design, a flange insert is pressed into the respective pipe end, increasing the outside diameter of the pipe. The flange insert has a large number of circumferentially extending

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grooves. After the flange insert has been inserted, a sleeve is pressed over the pipe end in the direction of the flange insert, deforming the pipe material. The pipe material displaced by the sleeve is pressed into the grooves of the flange insert and the flange insert is secured.

A disadvantage of the known design is that the pipe material tends to flow away under the high mechanical stress during the pressing process. As a result, the required tightness cannot always be guaranteed. The pressing process also causes tension in the pipe material, which reduces the material's strength.

Based on the prior art, the invention is based on the object of creating a pipe component which ensures a stress-free transition from the pipe to the pipe component and is not susceptible to corrosion.

According to the invention, this problem is solved by the features set out in the characterizing part of claim 1.

Further advantageous embodiments of the invention form the subject matter of claims 2 to 22.

The core of the invention is the measure of providing the wall of the adapter section with recesses and embedding the adapter section in a jacket made of a thermoplastic material. The jacket seals the adapter section. This prevents the penetration of moisture or gas from the pipe network into the atmosphere.

To improve the connection of the jacket with the adapter section of the pipe component, at least one

The recess can be designed as a cutout that extends through the entire thickness of the wall of the adapter section.

The recesses provided in adapter sections can be designed in different ways. In a simple form, these are made by drilling through the wall of the adapter section. These can be arranged regularly or irregularly over the length and/or circumference of the adapter section. In principle, it is also conceivable to design the recess in a labyrinth-like manner in order to further improve the fixation of the casing on the adapter section.

In a preferred embodiment, at least one seal is incorporated between the adapter section and the casing.

The adapter section can have recesses in its outer surface to promote contact or adhesion of the jacket. The jacket is thus mortised to the adapter section. The same goal is achieved by recesses in the inner surface of the nozzle.

An optimal fixation of the jacket is achieved by recesses in the outer and inner surface of the adapter section. In this way, the contact area between the jacket and the adapter section can be determined depending on the pipeline construction requirements.

If high longitudinal or torsional forces are expected, it is possible to equip the pipe component with a corresponding number of hooking or tapping options in the form of recesses for the casing. In conjunction with the recesses, an axial and radial fixation of the casing is ensured, which can withstand both tensile and compressive loads in the axial direction of the pipe as

also withstands torsional stress. This means that the casing is protected against both longitudinal forces and torsional forces.

The pipe is connected to the casing of the pipe component. The connection is force-fitting and/or form-fitting and ensures a stress-free transition from the pipe component to the pipe, while ensuring the tightness of the connection. There is no weakening of the pipe material.

The jacket overlaps the end of the pipe by a certain amount. This overlap ensures a secure and tight connection between the pipe and the jacket. In practice, an overlap that roughly corresponds to the thickness of the jacket is recommended.

Furthermore, the pipe component according to the invention also meets the highest requirements with regard to corrosion protection, since contact between metallic components and the conveying medium is largely prevented by the casing.

The jacket is preferably made of polyethylene. This can be injected around the adapter section in a practical manner.

The thickness of the jacket is preferably twice the thickness of the pipe wall. However, other jacket thicknesses are also possible.

During overmolding, an outer sheath and an inner sheath of the adapter section are formed, whereby the recesses and/or cutouts are completely filled with the sheath material so that the sheath hooked into the cutouts. This ensures both

a force-fitting as well as a form-fitting connection of the jacket with the adapter section.

The jacket represents an inner and outer coating of the adapter section and ensures good corrosion protection. Contact between the medium conveyed in the pipe and the connection section or the adapter section can thus be prevented.

The connection section and adapter section can be made of cast iron as one component. Cast iron is cost-effective and has proven itself in use in pipeline construction.

In practice, the connection section can be a screw connection. To transition to the next pipeline component, such as a steel pipe, the screw connection has a connecting thread. This can be an internal or external thread.

In another embodiment, the connection section is formed by a flange and the adapter section by a tubular nozzle.

As already mentioned, the pipe component is attached to the pipe with its casing. Although different connection techniques are possible here, an advantageous embodiment provides for a welded connection, such as by means of butt welding or socket welding. This connection technique is particularly advantageous if the pipe is made of polyethylene.

For pipes made of polyvinyl chloride, an adhesive connection is recommended.

In principle, the jacket can also be attached to the pipe using a clamp connection or a screw connection.

6 -

It is possible to create the outer and inner recesses by means of depressions in the wall of the adapter section. Checkerboard-like depressions are conceivable here, for example.

The outer and inner recesses can also be ring grooves that run parallel to each other. These are easy to manufacture. One or more of these ring grooves can also be used to accommodate seals.

Furthermore, it is possible to design both the inner and outer recesses as helical grooves.

An advantageous embodiment of the basic concept of the invention provides that at least one seal is provided on the outer surface of the adapter section. Two O-rings have proven to be useful.

The seals can rest on the outer circumference of the adapter section and tightly surround it so that they are embedded in the jacket.

However, to secure the position of the seals, it is advisable to arrange them in annular grooves.

It is also possible to provide at least one seal on the inner surface of the adapter section. This can also be embedded in the casing or housed in a groove.

A further advantageous embodiment provides that at least one seal is provided on the inner and outer surface of the adapter section. This ensures that even if one seal fails, there is still sufficient protection against a

There is moisture ingress or gas leakage.

An embodiment that further develops the general inventive concept is that the seal is embedded in a ring that is adapted to the inner diameter of the adapter section. The ring is inserted into the adapter section in a sealing manner in the area of the connection-side opening of the connection section. This can be done in a form-fitting and/or force-fitting manner, for example by gluing. The casing is tightly connected to the ring. The ring is also advantageously made of polyethylene. This can be connected to the casing - for example using a mirror welding process.

Since the seal in the welded ring is not relieved by any spirals or channels in the adapter section, this seal ensures the tightness of the pipe component even if one of the seals arranged on the outer circumference of the adapter section were to fail.

In principle, it is also possible to place one or more seals in grooves in the connection area of the adapter section and fix them in place using a ring. The ring is then connected to the casing.

Additional abutments in the form of elevations or depressions can be provided on the connection section and/or the adapter section, which make it easier to cover the adapter section and provide additional fixation of the jacket. These can be continuous ring-shaped or segment-like elevations or depressions.

In practice, it is advisable to provide an annular receiving groove in the connection section. This is filled with the plastic material when the jacket is molded on. This means that the connection-side end of the jacket fits into the receiving groove. This design takes into account the fact that the plastic material of the jacket contracts to a certain extent due to shrinkage after molding. Because the connection-side end of the jacket fits into the receiving groove, a sealed transition between the jacket and the connection or adapter section is also achieved here.

Furthermore, a ring collar can be provided on the connection section, which is rolled up after the spraying process of the jacket and thus ensures that the gap between the connection element and the jacket is pushed away. In this way, additional sealing is provided. Furthermore, corrosion in the transition area from the jacket to the connection section is suppressed.

The invention is described in more detail below with reference to embodiments shown in the drawings. They show:

Figure 1 shows a vertical longitudinal section through a pipe component connected to a pipe;

Figure 2 shows a pipe component with an inner ring and a seal integrated into it;

Figure 3 also shows a vertical longitudinal section of a pipe component with recesses in the inner surface of the nozzle;

Figure 4 shows the flange with attached nozzle from Figure 3;

· t ··

Figure 5 shows a vertical longitudinal section of a pipe component with recesses in the outer and inner surface of the nozzle;

Figure 6 shows the flange and the nozzle of Figure 5;

Figure 7 shows a side view of Figure 6 along the line A-D;

Figure 8 shows an enlarged view of section X of Figure 6;

Figure 9 shows a section of Figure 7 along the line E-E;

Figure 10 also in vertical longitudinal section a further embodiment of a pipe component;

Figure 11 again shows in vertical longitudinal section an embodiment of a pipe component.

Figure 12 shows another embodiment of a pipe component

Figure 13 in vertical longitudinal section an embodiment of a pipe component with screw connection

Figure 14· enlarged view of section Y of Figure 13

Figure 15 also in vertical longitudinal section another embodiment of a pipe component with screw connection

Figure 16 shows a vertical longitudinal section of a pipe component with a welded transition to the next pipe component

Figure 1 shows a pipe component 1, which is fixed at the end to a pipe 2 made of polyethylene. The pipe component 1 comprises a connection section in the form of a flange 3 and an adapter section attached to it in the form of a tubular nozzle 4, which is embedded in a jacket 5 which is also made of polyethylene. These penetrate the wall of the nozzle 4 over their entire thickness D^.

The flange 3 with its nozzle 4 is made of cast iron. In the nozzle 4, recesses 6 are arranged distributed over the circumference of the nozzle 4.

The recesses 6 are filled with the material of the casing 5. In this way, the casing 5 is connected to the nozzle 4 in a force-fitting and form-fitting manner.

On the outer surface 7 and on the inner surface 8 of the nozzle 4, the jacket 5 lies tightly against the nozzle 4 and thus forms an outer coating 9 and an inner coating 10, which ensure good corrosion protection.

A seal in the form of an O-ring 12 is arranged on the flange-side opening 11 of the nozzle 4. The O-ring 12 is received in a groove 13 in the inner surface 7 and is firmly enclosed by the casing 5.

Furthermore, two O-rings 14, 15 can be seen in Figure 1. These are located in the ring grooves 16, 17 of the nozzle 4, which run parallel to one another.

The O-rings 14, 15 are arranged in a length section 18 of the connector 4, which lies between the flange 3 and the beginning of the first recesses 6'. In this way, gas circulation between the jacket 5 and the connector 4 or the flange 3 can be prevented.

At the outlet end 19 of the pipe component 1, the pipe 2 is welded to the casing 5. The casing 5 has a step 21 in this area and overlaps the pipe end 20 by a dimension U. The overlap dimension U corresponds to at least twice the pipe wall thickness S.

The thickness D ₁ of the casing 5 is also at least twice the pipe wall thickness S.

Furthermore, Figure 1 shows the center lines 124 of holes (not shown) in the flange 3, via which the coupling of the individual pipes in a pipeline network or the transition to other pipeline components takes place.

Figure 2 shows a pipe component 22 in which a seal 23 is embedded in a groove 24 of an inner ring 25. The inner ring 25 is inserted into the flange-side opening 26 of the nozzle 27. The inner ring 25, which is made of polyethylene, is welded to the jacket 28. Even if the seals 29, 30 on the outer surface 31 of the nozzle 27 fail, the seal 23 ensures that the jacket 28 is sealed against the nozzle 27.

Otherwise, the pipe component 2 2 according to Figure 2 is constructed in the same way as the pipe component 1 of Figure 1.

The pipe component 32 of Figure 3 has a nozzle 33 with recesses 34, which in its inner surface

35 has annular grooves 36 running parallel to each other (see also Figure 4).

The sealing of the casing 37 with respect to the nozzle 33 is achieved here by the material of the casing 37 itself. This fills the annular grooves 36 and thus forms a labyrinth-like seal.

The pipe 38 is glued to the casing 37, whereby an overlap dimension U^ is also maintained here, which ensures a material-appropriate transition from the casing 37 to the pipe 38, so that a secure and intimate, stress-free connection is created.

The flange-side opening 39 of the nozzle 33 is chamfered at an angle α of 10° relative to the central longitudinal axis L, so that the opening 39 is slightly enlarged towards the outside. This measure makes it easier to insert intermediate rings and also makes coupling easier.

In the area of the flange-side opening 39, the flange 40 has a stop 41. The casing 3 7 comes into sealing contact with the inside of the stop 41.

The outer surface 42 of the nozzle 33 is inclined away from the flange 40 towards the central longitudinal axis L by an angle β of 3°.

Figure 5 again shows a pipe component 43 with a flange 44 and a nozzle 45 attached to it. The nozzle 45 has recesses 46 distributed around its circumference (see Figures 6 and 7). Recesses 49 and 50 are provided in both the inner surface 47 and the outer surface 48 of the nozzle 45. The recesses 46 and also the recesses 49, 50 are completely filled by the casing 51.

On the side of the nozzle 45 facing away from the flange, two O-rings 52, 53 are placed in annular grooves 54, 55 in its outer surface 48. These ensure that the casing 51 is sealed against the nozzle 45.

The casing 51 forms an outer coating 56 and an inner coating 57 of the nozzle 45. The inner coating 57 is flush with the flange opening 58. The outer coating 56 lies tightly in the area of the transition 59 from flange 44 to the supports 45.

The pipe 60 is welded to the casing 51 in a manner that ensures a stress-free and tight transition. For this purpose, the casing 51 and the pipe 60 overlap by a dimension U2 that corresponds to at least twice the pipe wall thickness S. The casing 51 also has a thickness D ₂ of at least twice the pipe wall thickness S.

The inner diameter I^ of the pipe 60 and the inner diameter I _M of the pipe component 43 correspond to one another, so that a flush, turbulence-free transition from the pipe component 43 to the pipe 60 is ensured.

Figures 6 and 7 show the flange 44 and the nozzle 45 of the pipe component 43 of Figure 5.

In particular, it can be seen from Figure 6 that the nozzle 45 has a wave-shaped configuration in section due to the inner recesses 49 and the outer recesses 50 (see also Figure 8 with the detailed illustration X of Figure 6).

The recesses 49, 50 are formed by annular grooves, which each merge into one another via curved length sections 60, 61. The groove opening Ng is slightly wider than the groove depth N _T . Between the individual recesses 49 there are areas 125 which have such a dimension N _B -

ensure that a sufficient wall thickness of the nozzle is maintained between the recesses 49 in the inner surface 47 and the recesses 50 in the outer surface 48 in the area marked with W in Figure 8.

Figure 7 shows a section through Figure 6 along the line A-D.

From this, the arrangement of the recesses 46 in the nozzle 45 can be seen.

In the embodiment, the angles marked with &ggr; are 25.5°, the angle ö is 70.5°, the angles &phiv; are 22.5° and the angles &mgr; are 45°.

Furthermore, it can be seen in Figure 7 that eight holes 62 are arranged in the flange on a pitch circle, offset by the angle μ (see also Figure 9). The flange 44 can be connected to a subsequent flange or other pipeline components using bolts via the holes 62.

Figure 10 shows an embodiment of a pipe component 63 with a flange 64 and a nozzle 65. The nozzle 65 is penetrated by recesses 66. Furthermore, recesses 67 and 68 are located in the outer surface 69 and the inner surface 70 of the nozzle 65, respectively. A jacket 71 made of polyethylene tightly surrounds the nozzle 65.

An abutment 72 is formed on the flange 64. The abutment 72 serves as a stop for the jacket 71 and supports the connection of the jacket 71 with the nozzle 65 or the flange 64. The abutment 71 also functions as an orientation aid during the overmolding process of the nozzle 65 with the jacket 71.

- 15 -

Two seals 7 3 are embedded in the outer surface 69 .

In the area of the flange-side opening 74 of the nozzle 65 there is a ring 75 made of polyethylene that is adapted to the inner diameter Ig of the nozzle 65. The ring 75 forms a sealing seat for two seals 76, which are integrated into ring grooves 77 of the flange 74.

The jacket 71 is in turn welded to the polyethylene pipe 78. In the embodiment of Figure 10, the overlap dimension U3 is at least three times as large as the wall thickness S of the pipe 78. The ratio of the inner diameter Ip to the outer diameter I^ is greater than or equal to 1:1.5. The jacket thickness D ₃ at the marked point is at least twice the pipe wall thickness S.

In the embodiment of Figure 11, a seal 79 is embedded in a ring 80. The ring 80 is adapted to the inner diameter I _D1 of the flange 81 or the nozzle 82 and forms a sealing seat for the seal 79. The ring 80 is firmly welded to the jacket 83 made of polyethylene. Because the seal 79 is firmly enclosed on all sides and is not relieved by any channels or the like, the tightness of the jacket 83 with respect to the nozzle 82 is guaranteed even if the seals 84 provided in the outer surface 85 of the nozzle 82 fail.

Furthermore, the recesses 86 as well as the inner recesses 87 and the outer recesses 88 can be seen in Figure 11, which are completely filled with polyethylene when the nozzle 82 is overmolded. In this way, the jacket 83 is fixed both axially and radially.

At the end, a gas pipe 89 is welded firmly to the casing 83.

The pipe component 90 shown in Figure 12 corresponds largely to the pipe component 63 of Figure 10. The connection section is also formed here by a flange 91. An annular receiving groove 92 is present in the flange 91. The flange 91 also has an abutment in the form of an annular collar 93. The connection-side end 94 of the jacket 95 fits into the receiving groove 92. The annular collar 93 can be rolled in after the jacket 95 has been sprayed on. This means that it is bent in the direction of the central longitudinal axis L of the pipe component 90. In this way, the gap in the transition area between the jacket 95 and the flange 91 is minimized. Furthermore, an additional sealing effect is achieved, so that corrosion in the transition area is also suppressed.

Figure 13 shows a pipe component 96 with a connection section in the form of a screw connection 97. The adapter connection 98 is connected to the screw connection 97. The adapter connection 98 is penetrated by recesses 99. Furthermore, the adapter connection 98 has recesses 100, 101 in its outer and inner surface. The recesses 99 and the recesses 100,

101 are filled by the plastic material of the casing 102.

The screw connection 97 has a receiving groove 103. The connection-side end 104 of the jacket engages in this groove

102 and is fixed by means of a ring collar 105 (see also Figure 14). Here it can also be seen that the recess 100' is undercut, which achieves an additional abutment effect.

·· «*· ft ft

-&Pgr;&iacgr;&tgr;&agr; A ring 106 is arranged inside the screw connection 97. This ring encloses two O-rings 107, which lie in annular grooves 108 of the screw connection 97.

On the connection side, the screw connection 97 has a connecting thread 109 with which the connection to a steel pipe 110 can be made. For this purpose, the steel pipe 110 has a corresponding external thread 111.

The pipe components 112 and 113 shown in Figures 15 and 16 correspond in principle to the embodiment of the pipe component 96 as shown in Figure 13.

However, the pipe component 112 has a screw connection 114 with an adapter head 115 and a threaded part 116. The threaded part 116 is provided with an external thread

117, which allows the connection to a steel pipe

118 with a corresponding internal thread 119.

The pipe component 113 of Figure 16 has a stepped adapter head 120 with a step 121 which is adapted to the steel pipe 122 to be connected to the pipe component 113. As a result, a nozzle-shaped welding ring 123 is formed on the adapter head 120. The steel pipe 122 is connected to the pipe component 113 by welding via this.

- 22 - Reference symbols list

1 - Pipe component

2 - Pipe

3 - Flange

4 - Nozzle

5 - Coat

6 - Recess 6 ' - Recess

7 - outer surface of

8 - inner surface of

9 - outer coating v. 4

10 - inner coating v. 4

11 - Opening of

12 - O-ring

13 - Ring groove

14 - O-Rmg 15 - O-ring 16 - Groove 17 - Groove 18 - Length section v. 4 19 - End of 1 20 - Pipe end 21 - Level 22 - Pipe component 23 - Poetry 24 - Groove 25 - Inner ring 26 - flange-side opening 27 - Support 28 - A coat 29 - Poetry

30 - Seal

31 - outer surface

32 - Pipe component

33 - nozzle

34 - Recess

- 23 35 - inner surface &ngr;. 33

36 - Ring groove 37 - A coat 38 - Pipe 39 - Opening

40 - Flange

41 - Stop

42 - outer surface

43 - Pipe component

44 - Flange

45 - nozzle

46 - Recess

47 - inner surface

48 - outer surface

49 - Recess

50 - Recess

51 - Coat

52 - O-ring

53 - O-ring

54 - Ring groove

55 - Ring groove

5 6 - outer coating

5 7 - inner coating

58 - E'lanschöff fnung

59 - Transition area from 44 to 45

60 - Pipe

61 - Length section

62 - Bore

63 - Pipe component

64 - Flange » · · ··· · · · ··· · · t·* 65 - Support 66 - Recess 67 - Recess 68 - Recess 69 - outer surface 70 - inner surface 71 - A coat

- 24 -

72 - Abutment 73 - Poetry 74 - Opening of 65 75 - Ring 76 - Seals 77 - Ring grooves in 64 78 - Pipe 79 - Poetry 80 - Ring 81 - Flange 82 - Support 83 - A coat 84 - Seals 85 - outer surface 86 - Recesses 87 - Recess inside 88 - Recess outside 89 - Pipe 90 - Pipe component 91 - Flange 92 - Mounting groove 93 - Ring collar 94 - connection side end of 95 95 - A coat 96 - Pipe component 97 - Screw connection 98 - Adapter connection 99 - Recesses 100 - Recesses 100' - Recess 101 - Recesses 102 - A coat 103 - Mounting groove 104 - End of 102 105 - Ring collar 106 - Ring 107 - O-ring
* · · ··· * · · ··· · · ···

- 25 -

108 - Ring groove

109 - Connecting thread

110 - Steel pipe

111 - External thread

112 - Pipe component

113 - Pipe component

114 - Screw connection

115 - Adapter head

116 - Threaded part

117 - External thread

118 - Steel pipe

119 - Internal thread

120 - Adapter head

121 - Level

122 - Steel pipe

123 - Weld ring

124 - Center line

125 - Area

I^ - inner diameter v.

1(4 - inner diameter of 4 Ij) - inner diameter of

I _D1 - inner diameter v.

I _s - inner diameter v.

I^ - Outside diameter U^ - Overlap dimension U ₂ - Overlap dimension U3 - Overlap dimension S - Pipe wall thickness D _A - Thickness v. 4 D ₁ - Thickness v. 5 D ₂ - Thickness v. 51 D ₃ - Thickness L - Central longitudinal axis

- 26 -

a - angle

β - angle

&ggr; - angle

&dgr; - angle

φ - angle

μ - angle

Ng - groove opening &Ngr;_&tgr; - groove depth W - wall thickness v.

Claims (22)

- 18 -Protection claims 1. Pipe component for fixing to the end of a pipe (2, 38, 60, 78, 89), in particular a gas pipe made of plastic, which has a connecting section (3, 40, 44, 64, 81, 91, 97, 114, 120) and a tubular adapter section (4, 27, 33, 45, 65, 82, 98), characterized in that the wall of the adapter section (4, 27, 33, 45, 65, 82, 98) is provided with recesses (36, 49, 50, 67, 68, 87, 88, 100, 101) in some areas and the adapter section (4, 27, 33, 45, 65, 82, 98) is sealingly embedded in a jacket (5, 28, 37, 51, 71, 83, 95, 102) made of thermoplastic material that can be connected to the pipe (2, 38, 60, 78). 2. Pipe component according to claim 1, characterized in that at least one recess is designed as a recess (6, 6', 34, 46, 66, 86, 99) penetrating the wall of the adapter section (4, 27, 33, 45, 65, 82, 98) over the entire thickness (D _A ). 3. Pipe component according to claim 1 or 2, characterized in that the adapter section (4, 27, 45, 65, 82, 98) is embedded in the casing (5, 28, 51, 71, 83, 95, 102) with the incorporation of at least one seal (12, 14, 15, 23, 29, 30, 52, 53, 73, 77, 79, 84, 107). 4. Pipe component according to one of claims 1 to 3, characterized in that the adapter section (45, 65, 82) has recesses (50, 67, 88, 100) in its outer surface (48, 69, 85). - 19 - 5. Pipe component according to one of claims 1 to 3, characterized in that the adapter section (33, 45, 65, 82) has recesses (36, 49, 68, 87, 101) in its inner surface (35, 47, 70). 6. Pipe component according to one of claims 1 to 3, characterized in that the adapter section (45, 65, 82) has recesses (49, 50, 67, 68, 87, 88, 100, 101) in its outer surface (48, 69, 85) and in its inner surface (36, 49, 68, 87). 7. Pipe component according to one of claims 1 to 6, characterized in that at least one seal (14, 15, 29, 30, 52, 53, 73, 84) is provided on the outer surface (7, 31, 48, 69, 85) of the adapter section (4, 27, 45, 65, 82). 8. Pipe component according to one of claims 1 to 6, characterized in that at least one seal (12, 23, 76, 79, 107) is provided on the inner surface (8, 70) of the adapter section (4, 27, 65, 82, 98). 9. Pipe component according to one of claims 1 to 6, characterized in that at least one seal (12, 14, 15, 23, 29, 30, 73, 76, 79, 84) is provided on the inner surface (8, 70) and on the outer surface (7, 31, 69, 85) of the adapter section (4, 27, 65, 82). - 20 - 10. Pipe component according to one of claims 8 or 9, characterized in that the seal (13, 76, 79) is embedded in a ring (25, 75, 80, 106) adapted to the inner diameter of the adapter section (27, 65, 82), which ring is sealingly incorporated into the connection section (27, 65, 82) in the region of the connection-side opening (26, 74) and is joined to the casing (28, 71, 83, 102). 11. Pipe component according to one of claims 1 to 10, characterized in that the outer and/or inner recesses (36, 49, 50, 67, 68, 87, 88) are annular grooves running parallel to one another. 12. Pipe component according to one of claims 1 to 10, characterized in that the outer and/or inner recesses are designed as helical grooves. 13. Pipe component according to one of claims 1 to 10, characterized in that the outer and/or inner recesses are designed as checkerboard-like depressions. 14. Pipe component according to one of claims 1 to 13, characterized in that the jacket (5, 28, 37, 51, 71, 83, 95, 102) is injection-molded onto the adapter section (4, 27, 33, 45, 65, 82, 98). 15. Pipe component according to one of claims 1 to 14, characterized in that the jacket (5, 28, 37, 51, 71, 83, 95, 102) is connected to the pipe (2, 38, 60, 78, 89) by welding. - 21 - 16. Pipe component according to one of claims 1 to 14, characterized in that the jacket is connected to the pipe by adhesive technology. 17. Pipe component according to one of claims 1 to 14, characterized in that the jacket is fixed to the pipe by means of a clamp connection. 18. Pipe component according to one of claims 1 to 14, characterized in that the jacket is fixed to the pipe by means of a screw connection. 19. Pipe component according to one of claims 1 to 18, characterized in that the connecting section (97, 114) has a connecting thread (109, 117). 20. Pipe component according to one of claims 1 to 18, characterized in that the connecting section is a flange (3, 40, 44, 64, 81, 91) and the adapter section is a nozzle (4, 27, 33, 45, 65, 82). 21. Pipe component according to one of claims 1 to 20, characterized in that the connecting section (91, 97) has an annular receiving groove (92, 103) for the connection-side end (94, 104) of the jacket. 22. Pipe component according to one of claims 1 to 21, characterized in that the connecting section (64, 91, 97, 114, 120) has an abutment (72, 93, 105) for the casing (71, 95, 102).