DE7036283U - PIPE COUPLING. - Google Patents

Description

PATE NTAM: WOLDS DlPL-INe. OR. IUR. "'ΟΐΚ | _.- ΙΝβ. VOLKER BUSSE DIETRICH BUSSE

45 Osnabrück, September 10, 1973

MOSERSTRASSE 2Ο / 24

G? 0 36 283.3

Industriele Qndernei.iing Wavin NV .

ν. Pipe coupling y

The innovation relates to a pipe coupling with a socket or a socket pipe part and a plug:. ear ceil made of thermoplastic Plastic j from at least one sealing ring arranged between the socket and the plug-in pipe part elastic material, a circumferential recess provided in the inside of the sleeve, which extends in the direction of the Insertion end of the sleeve tapers conically, and a coupling ring housed in this recess one of the of the pipe parts at least the same hardness that comes into clamping engagement between the plug-in pipe part and the recess .

In known pipe couplings of this type, the sealing means is located for sealing off that which is enclosed by the pipe parts The interior to the environment is usually in the area between the coupling ring and the respective inner end of the Plug-in pipe part. This has the consequence that the coupling ring in a region of the plug-in pipe part on this from the

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Clamping effect exerts resulting forces, other -lie wall of the Insert pipe part is exposed to the difference between the pressure inside the pipe coupling and the environment. This results in In practice, especially after a long period of operation, damage to the corner tube part, which necessitates its replacement do. This damage can occur particularly quickly if the pressure differences fluctuate as a result of changes in internal pressure. Furthermore, in known pipe couplings in which there is a negative pressure inside the coupling, there is a risk that Gases or liquids are sucked in from the environment into the interior of the pipe coupling, since the coupling ring in particular when it is made of metal, forces exerted on the plug-in pipe part made of thermoplastic plastic, which cause a flow of the material. The deformations resulting from this, which are particularly pronounced towards the free end of the plug-in pipe part have a strong effect, leaks can easily occur in the sealing area enter.

The aim of the innovation is to create a pipe coupling in which there is a risk of damage to the wall of the plug-in pipe parts due to the stresses in the plug-in area entered by the coupling ring in the plug-in pipe wall and the risk of Deformations of the insert pipe parts due to a flow of the material is effectively counteracted.

Based on a pipe coupling of the type specified at the beginning this is achieved according to the innovation in that the or at least one of the sealing rings on the free end of the

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Einf ikrohrteils facing away from the coupling ring side in the area arranged between the insertion end of the sleeve and the recess and the inside of the insertion pipe part with a opposite the recess of the socket in the connection position of the parts arranged metal sleeve is provided. In this embodiment, the coupling ring acts on the plug-in pipe part in an area that is free of any or significant pressure differences, so that the clamping effect of the coupling ring cannot result in any damage to the plug-in pipe part, while the metal bushing counteracts a deformation of the plug-in pipe part and in particular any scattering of any deformations prevented in that area of the plug-in pipe part in which it is in sealing engagement with the sealing ring. on This ensures that an effective seal is always retained even after the coupling has been in operation for a long time. under all circumstances, even with considerable negative pressures in the pipe coupling and any deformation of the plug-in pipe part and / or the sleeve due to the flow of the thermoplastic material, the entry of gases or liquids from the environment into the pipeline channel.

Further features and advantages of the subject of the innovation result from the claims and the following description of an embodiment shown in the drawing. In In the drawing, part A shows a pipe coupling with a conical ring as the coupling member, and part B takes place whose one round coiled spring.

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The pipe coupling shown has a pipe part in the form of a socket 1 made of polyethylene with two receiving areas 2 and 2 '. In the receiving area 2, 2 'there is a respective plug-in pipe part 3 or 3'. In the receiving areas 2, 2 'of the socket 1, recesses 4, 4' for accommodating coupling members 5 and 5 ^{1 are} provided.

The coupling member 5 shown in part A of the figure consists of a conical slotted ring made of polyethylene of the same hardness and is inserted into the tapering recess 4 from the free end 6 of the receiving area 2. Then the plug-in pipe part 3 is pushed in. The slotted ring 5 has an inner diameter such that the end 7 of the plug-in pipe part 3 can be passed through, the end wall 8 of the ring 5 being pressed against the end wall 9 of the recess Ά , on the other hand the outer wall 10 of the plug-in pipe part 3 in Ring is pinched. Therefore, when the plug-in pipe part 3 is pulled out of the receiving area 2 of the socket 1, it takes the ring 5 with it, which is clamped between the outer wall 10 of the Einsteckrärteils 3 and the tapered wall 11 of the recess 4 in the direction of the free end 6 of the receiving area 2 .

The surface of the outer wall 10 of the plug-in pipe part 3 is advantageous provided with a screw thread or ribs 14. Preferably the one that cooperates with the wall of the recess 4 Surface 12: of the ring 5 with a profile, e.g. B.

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in the form of corrugations, preferably in the form of a thread. This is also useful for the inner surface 13 of the ring

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Receiving area 2 carry the corrugations or the thread I ¹ J to take the ring 5 with it and to establish a perfect, tensile connection.

Furthermore, sealing rings 15 and 16 are provided which are inserted in a recess 17 or 18 of the receiving area 2 of the socket 1 are housed. These sealing rings prevent medium from leaking out of the pipe or medium from being sucked in from the Environment into the interior of the pipe coupling.

The coupling members 5 are in the embodiment according to part A of the drawing in an area in which the ear part is depressurized is. Therefore, the pipe part can practically not be damaged, which cannot be ruled out if the coupling links open act on a pressurized pipe part.

In the right part B of the drawing, a similar pipe connection is shown, but with a closed round spiral spring 5 ^f made of metal wire as a coupling member. The turns of this metal spring then penetrate when using z. B. polyethylene for the plug-in pipe part 3 'and the receiving area 2 ¹ in the wall 19 of the recess V and in the profiled wall 20 of the plug-in pipe part 3' and ensure an absolutely tensile connection.

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To maintain a good, draft. '. Ster. Connection exists at least the surface of the coupling is 5.5 d. H. the ring, the coil spring or the like, preferably made of a material which is harder than the surfaces of the pipe parts to be connected. because then the hard profiling in the thermoplastic material penetrates. The slotted ring 5 can, for. B. exist for a tensile connection of polyethylene pipes made of hard polyvinyl chloride or have a hard surface layer made of polyvinyl chloride.

For reinforcement purposes, a steel sleeve 22 is attached in the ends 7 and 7 'of the plug-in pipe parts 3, 3'. To avoid pressure, the corners 21 and 21 'of the recess H, 4' are rounded. The end walls 9 and 9 ^T should be designed in such a way that when the plug-in tube parts 3, 3 'are moved inward, the coupling members 5 or 5' are held in place with respect to the plug-in pipe parts ^{3, 3 f.}

In the case of a plug-in pipe part on which the profiling ends at some distance from the end 7.7 ', it is possible to pach this to push back a clamping, the coupling member in the form of the ring from the end of the area 2 with a device to grasp the plug-in socket 1 and then pull the plug-in pipe part 3 outwards again. After attaching the Eineteck pipe part 3 'this is of course no longer possible.

The slotted, fully cross-sectional ring 5 can also consist of metal, which in certain cases with thermoplastic

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see pipes is preferable. It is also possible to use an at. *? hard polyvinyl chloride existing plastic "-ing to use," These hard metal surfaces with z. B. siner profiling exist, whereby the desired tensile strength of the connection is also maintained.

To loosen an insert pipe 3 or 3 'from the socket 1 can, if both work together with a coupling member designed as a slotted ring, it is recommended that Plug-in pipe 3 on its surface 10 with a left-hand thread and the plug-in pipe 3 'with a right-hand thread, or vice versa Mistake. You can then unscrew the socket 1 from the pipe 3 or 3 'without difficulty. It goes without saying that in this Case the coupling members 5 are provided with an adapted thread.

Claims (2)

Protection claims: 1. Pipe coupling with a socket or a socket pipe part and a plug-in pipe part made of thermoplastic material, at least one sealing ring made of elastic material arranged between the socket and the plug-in pipe part, a circumferential recess provided in the inside of the socket, which tapers conically towards the plug-in end of the socket , and a coupling ring accommodated in this recess of a hardness of at least the same hardness as that of the pipe parts, which comes into clamping engagement between the plug-in pipe part and the recess, characterized in that the or at least one of the sealing rings (15) on the free end (7, 7 *) of the plug-in pipe part (3.3 ') facing away from the coupling ring (5.5') in the area between the plug-in end (6.6 ') of the sleeve (1) and the recess ( ¹ 1.4') and the Inside of the plug-in pipe part (3, 3 ') with one of the recesses (4, 1 ») of the socket in the connecting position of the parts arranged opposite one another Metal sleeve (22) is provided. 2. Pipe coupling according to claim 1, characterized in that in a connection with a sleeve (1) and two thus tensile strength connected plug-in pipe parts (3, 3 ') the surface of the free end of a first pipe part (see 3. 3) with a left-hand thread and the second pipe part (e.g. 3 ') with a right-hand thread, is preferably provided with the same slope. 703628320.1173