DE2359417A1 - Pipe coupling with detachable flanges - has inner ring of grooved half of plastic and outer portion of metal - Google Patents

Abstract

The coupling has two detachable flanges, one having a spigot fitting in a groove containing the seal in the other, which comprises an outer part and an inner ring together forming the groove between them. The inner ring is of plastic, and the outer part of metal, particularly high-grade steel. The spigoted flange can also be of plastic, and it and the inner ring can both be integral with their respective pipe sections, of the same material. The pipe sections can be inserted in the main pipe and welded to them. The design allows simple replacement of the seal.

Description

PATENT Attorney DIPL.-ING. ß. H. WERNtifi 2359417

Applicant:

415 KREFELD

Wilhelm Schulz DAHLERDYK _{7 Sat.}

TELEPHONE (02151) 26461

Krefeld, Kuhleshütte 85

Pipe coupling addendum to patent .... (patent application P 23 25 910.1)

The invention relates to a pipe coupling, consisting of two releasably connected flange rings, one of which one with its base forming the sealing surface annular groove in which the packing is inserted, and the other one in the Groove engaging annular tongue, in each case on the mutually facing surfaces, has, the one provided with the groove The flange ring is in two parts and consists of a ring, on the outer circumferential surface of which the inner side surface and a ring shoulder is formed, one surface of which is the base of the groove, and from one pushed in the axial direction over the flange ring to the ring shoulder resting on its inner circumferential surface the outer side wall of the groove forming coupling ring with an approximately L-shaped cross section according to patent .... (patent application P 23 25 910 * 1).

From DT-PS 63 526 pipe couplings are known in which a flange ring is welded to the end of one of the pipes to be connected to one another. The releasable connection of the The pipe is coupled using clamps, brackets or straps.

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The advantages of this known pipe coupling are simple and inexpensive production, guidance in the axial and radial direction by the tongue and groove, each in a ring shape, interlocking flange rings and the good sealing effect. The only disadvantage is that the replacement of the seal or packing is difficult or, in some cases, impossible to accomplish at all is.

The reason for this is that the pipe coupling installed in a pipeline is under tension and only can be pushed apart with great effort. The flange rings forming the coupling must be wide be pushed apart enough so that one has access to the one lying in the annular groove in the one flange ring. poetry or package, which is then only extremely cumbersome to get out of the groove. In part is it is not at all possible to push the flange rings of the pipe coupling far enough apart to even adhere to the seal; to approach. A renewal of the seal or packing is necessary from time to time.

The pipe coupling according to the main patent could remedy this situation and, in particular, make it possible to replace it the packing or seal can be carried out more easily and also more quickly. The aim of the present invention is now to design the pipe coupling in the same way for the connection of plastic pipes.

According to the invention, this object is achieved in that at least the flange ring provided with a groove, but optionally also both flange rings, are made of plastic and the coupling ring is made of metal, preferably steel, in particular stainless steel . The plastic flange ring can be attached to the

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Plastic tube welded on and by means of the clamping rings on the other hand "enough pressure on the clutch when pulling the plague be exercised.

According to an advantageous embodiment of the invention Couplings are also one-piece with the flange rings Tubes or sockets made of plastic. To each other connecting pipes can be in the pipe sections or sockets be pushed and welded to these.

The flange rings of the pipe coupling according to the invention can be releasably connected to one another by means of brackets or clamping rings with an approximately C-shaped cross-section »

To change the seal or packing in the case of the invention Pipe coupling is after loosening the clamps or -ring first of all over the one provided with the ring groove Flange ring pushed back ring. Thereupon the seal or packing is already exposed on the outer circumference. To change the seal or packing, the two flange rings are only pushed apart by a relatively short distance. The old seal or pack can then easily be removed and a new one inserted will.

On the basis of the drawing, in which an exemplary embodiment is shown is, the invention will be explained in more detail.

Fig. 1 shows a longitudinal section and

2 shows a plan view of the exemplary embodiment according to the invention Pipe coupling.

The pipe coupling consists of two flange rings 1 and 2 made of plastic. These can either be sent directly to each one

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Plastic pipe 3 or k welded on or, as in the illustrated embodiment (FIG. I), via pipe sections 1 'or 2 * made of plastic that are integrally connected to them. In the pipe sections 1 ·, 2 * projections or depressions can be provided for the attachment of a suitable spreading device for pushing the face rings 1, 2 apart.

The one flange ring 2 engages with an annular spring in a corresponding annular groove 7 in the opposite flange ring 1. In the annular groove 7, the seal or packing 8 is inserted, which when the pipe coupling is tightened by means of tension clamps or ring 9 »9 'or clamps, as they are known from DT-PS 63 526, by the annular spring 6 of the flange ring 2 is compressed and pressed sealingly against the base of the groove 7 which forms the sealing surface.

While the inner side surface 10 of the groove 7 is formed by the outer circumferential surface of the flange ring 1 and the base 11 of the groove 7 is formed by an annular shoulder 12 directed radially outward from the flange ring 1, the outer side surface 13 of the groove 7 is formed by the inner circumference » surface of the metallic coupling ring 14 provided according to the invention and pushed over the flange ring 1 and resting against its annular shoulder.

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Claims (1)

Expectations Pipe coupling, consisting of two detachably connected to one another Flange rings, one of which with yours Base the sealing surface forming the annular groove in which the packing is inserted, and the other one in the Groove engaging annular tongue each on the facing surfaces, the grooved The flange ring is in two parts and consists of a ring, on the outer circumferential surface of which the inner side surface and a Ring shoulder is formed, one surface of which is the groove base, and one in the axial direction over the flange ring pushed, on whose ring heel resting, with its inner circumferential surface the outer side wall of the Groove-forming coupling ring with an approximately L-shaped Cross-section exists according to patent .... (patent application 'P 23 25 910.1), characterized in that the flange ring (1) made of plastic and the coupling ring (i * 0 from Metal, preferably steel, in particular stainless steel, is made. 2 »Pipe coupling according to claim 1, characterized in that the flange ring (2) is also made of plastic. 3. Pipe coupling according to one of claims 1 or 2, characterized characterized in that the flange rings (1,2) and the with them one-piece pipe piece · or bushings (1 ', 2 ·) Made of plastic. k » Pipe coupling according to one of claims 1 to 3t, characterized in that the pipe pieces or bushings (1 ·, 2 ·) are pushed into the pipes (3t ^) and welded to them · 509823/0113