DE8318762U1 - TRANSITION PIECE IN A GAS PIPE - Google Patents

Description

Dipl.-PHYS. DR. WALTHER JUNIUS 3 Hanover

WOLFSTRASSE 24 ■ TE L E FO N (05 11) I) 45 3 O

June 24, 1983 My files:

Immanuel Jeschke, St. Nikolaistr. 4 + 5 »32o3 Sarstedt, district Heisede

Transition piece in a gas line

The invention relates to a transition piece in a gas line from metal pipe to plastic pipe.

Gas pipes made of iron or steel are laid within structures, the supply lines from those in the street lying gas transport line to the house is made of plastic pipes. The transition from the metal pipe on the plastic pipe is carried out through a transition piece. Such transition pieces are in great variety known. Most of the time it is a question of complicated fittings made up of a large number of parts that Clamp the sealing rings between you and the steel pipe and the plastic pipe. Such fittings are expensive Also not easy to manufacture and in some embodiments to assemble.

It is the object of the present invention to provide a transition piece with very simple means

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a good and durable one that is also easy to assemble
Connection between the metal pipe and the plastic pipe
manufactures. |

The transition piece according to the invention is characterized by
a metal pipe piece to be fastened to the metal pipe with an »external thread section arranged at the end, to both of which
Each side has a cylindrical surface, with
the one between the face and the thread
cylindrical surface has a smaller outer diameter than
has the thread base by a on the plastic tube
Socket piece to be fastened with one in the external thread
screw-in internal thread, each on both sides
a cylindrical surface is arranged, the the
Front side adjacent cylindrical surface has an outer diameter which is greater than the diameter of the thread root, and by a respective sealing ring f receiving groove on a cylindrical surface to each
Side of the thread. _v "

This transition piece consists of only two parts.,
which are to be screwed together and through the sealing | rings result in excellent tightness. These parts are; | very easy and simple to manufacture. The metal pipe piece | can be the end of the pipe at the other of which | At the end of the house connection valve (e.g. in the form of the main shut-off valve) is attached. The socket piece can be designed as the end of the pipe which forms the gas supply line laid in the ground. But it can also be a simple socket piece, which is then marked with a | further sleeve is connected to the supply pipe. | However, other connecting means such as nipples or the like are also possible. 1

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It does not matter whether the grooves for the sealing rings are made on those cylindrical surfaces are located on the steel pipe or on those cylindrical surfaces that are inside the Socket piece are located.

A plastic-coated metal pipe can also be used. It is useful if the plastic jacket, which extends to just before the thread on the metal tube, is reduced in diameter at its end, a cylindrical one Forms surface and in this has the groove for receiving the sealing ring.

It is advantageous if the cylindrical surface facing away from the end face on the metal pipe section has a larger outer diameter than the outer thread diameter. This embodiment makes it easier to screw in the metal pipe section in the socket piece. An embodiment which is characterized in that serves the same purpose the cylindrical surface facing away from the end face of the plastic sleeve part has a smaller diameter than the Has thread diameter.

For a perfect seal, it is advantageous if the distance between two cylindrical surfaces of the metal pipe part and the socket part is so wide that the sealing ring inserted into the groove is screwed into one another is not sheared and is so tight that the sealing ring rests on both cylindrical surfaces.

Around the thread in the socket piece made of plastic To give particular stability, it is advantageous if the internal thread of the socket part is cut into a metal ring, whose outside gate bears cracks and / or grooves and / or roughening and which is in the plastic of the

Muff part is embedded.

If, on the other hand, the thread in the socket piece is made of plastic, it can be advantageous if the socket part next to its Front side has a metal ring embedded in the plastic to prevent the sleeve from bursting if the The thread is too tight or the metal pipe is not screwed into the thread in the correct way.

The transition from the socket part to the supply pipe made of plastic can either take place in such a way that the socket part consists of PVC and is glued to a PVC pipe or in such a way that the socket part consists of polyethylene and means a welding sleeve provided with a heating wire is welded to a polyethylene pipe.

The essence of the invention is shown below with reference to an embodiment shown schematically in the drawing explained in more detail. Show it:

Fig «. 1 shows a section through the transition piece. Fig. 2 is a view of the metal pipe piece,

Fig. 3 is a section through the socket piece with welded on " Supply pipe,

4 shows a section through a transition piece in which the metal pipe section is provided with a plastic sheath.

The metal pipe section 1 has an external thread 2 at the end, On both sides of the external thread 2 there is a cylindrical surface 3, 4, each with a groove 5 is provided, in which a sealing ring 6, e.g. in the form of a

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O-ring or a quart ring is inserted. ~ BqT diameter A of the cylindrical surface 4 is selected to be equal to or greater than the outer diameter D of the external thread, the diameter D of the cylindrical surface 3 is selected to be less than or equal to the diameter C of the thread root of the external thread 2. It is particularly useful to choose the diameter D of the cylindrical surface 3 so that the sealing ring 6 inserted into the groove 5 does not touch the internal thread 8 in the socket piece when the metal pipe section 1 is screwed into the socket piece 7.

The socket piece 7 is made of plastic. It has an internal thread 8 in its interior, to both of which Sides cylindrical surfaces 9, Io are formed. The frontal cylindrical surface Io of the socket piece 7 corresponds to the cylindrical surface 4 facing away from the end face of the metal pipe section 1 A sealing ring 6 is located on surfaces 4 and Io, with the diameter of the cylindrical surfaces are chosen so that the sealing ring 6 inserted into the groove 5 when Screwing into each other is not sheared, but is pressed against both cylindrical surfaces. That of the front The cylindrical surface 9 facing away in the socket piece 7 corresponds to the cylindrical surface 3 on the end face of the metal pipe piece. Here the diameters become the same chosen so that a sealing ring inserted into the groove 5 is not sheared off when the parts are screwed into one another, but after screwing together it fits snugly on both cylindrical surfaces.

The internal thread 8 in the socket part 7 is expediently cut into a metal ring 11 on its outside Carries grooves 12 or projections or the like. This

the ring 11 carrying the internal thread 8 is embedded in the plastic during the manufacture of the plastic socket part, E.g. during production by injection molding in the mold, into which the plastic is then injected under pressure or is poured in, so that the plastic of the socket part jind the ring 11 from the outside sheathed the front sides.

In Pig. 3 it can be seen how a plastic pipe 13 is welded to the end part 14 of the socket piece 7 is: A welding sleeve 16 is pushed over the frontal connection point 15 so that the frontal joint 15 lies in the middle of the welding socket 16. This has a heating wire winding 17 in its interior, which is heated for the purpose of welding, whereby the plastic of both the end piece 14 of the socket part 7 as well as the end of the tube 13 heated so that it melts and with the also melting plastic of Welding sleeve 16 enters into a firm connection as soon as the plastic cools down again.

In Fig. 4, the metal pipe section 1 is covered by a plastic jacket 18 coated, which is turned off in its end area for purposes of calibration and here a cylindrical surface 19 forms. In this cylindrical surface 19 is the groove 5 into which the dial ring 6 is inserted.

Claims (8)

• · ■ · ti · t <· claims 1. Transition piece in a gas line from metal pipe to plastic pipe, marked by a piece of metal pipe (l) to be attached to the metal pipe end threaded section (2), on both sides of which a cylindrical surface (3, 4) is located is, the cylindrical surface (3) located between the end face and the thread (2) having a smaller outer diameter (D) instructs as the thread base surface (C), through a socket piece (7) to be attached to the plastic pipe with an internal thread (8) which can be screwed into the external thread (2) and a cylindrical one on each of its two sides Surface (9, Io) is arranged, with the one adjacent to the end face cylindrical surface (Io) has an outer diameter which is greater than the diameter of the thread root is, and by a respective sealing ring (6) receiving groove (5) on a cylindrical surface (3, 4) on each side of the Thread (2, 8). 2. transition piece according to claim 1,
characterized, that on the metal pipe section (1) the cylindrical surface (4) facing away from the end face has a larger outer diameter (A) than the outer thread diameter (B). 3. transition piece according to claim 1,
characterized, that the cylindrical surface (9) of the plastic hoop part (7) facing away from the end face has a smaller diameter than the thread diameter. 4. Transition piece according to claim 1, characterized in that the distance between two cylindrical surfaces (3,9; 4, lo) of the metal pipe part (l) and the socket part (7) is so far that the sealing ring (6) inserted in the groove (5) is not sheared off when screwing into one another, and is so narrow that the sealing ring (6) rests on both cylindrical surfaces. 5. Transition piece according to claim 1, characterized in that the internal thread (8) of the socket part (7) in one Metal ring (11) is cut, the outside of which bears projections and / or grooves (12) and / or roughenings and the is embedded in the plastic of the socket part (7). 6. Transition piece according to claim 1, characterized in that the socket part (7) in addition to its end face in has the plastic embedded metal ring. 7. Transition piece according to claim 1, characterized in that the socket part (7) consists of PVC and is connected to a PVC pipe is glued on. 8. Transition piece according to claim 1, characterized in that the socket part (7) consists of polyethylene and means a welding socket (16) provided with a heating wire (17) is welded to a polyethylene tube (13).