DE2419893A1 - PIPE CONNECTION - Google Patents

Description

PAl ENTAMELTE

DlPL-INS. DR. IU. *. DIPL-INQ.

VOLKER BUSSE DIETRICH BUSSE

45 OSNABRoCK ₃ April 23, 1974

MDSERSTRASSE 2O / 24- χ / mj-

WAVIN B.V.

251 Händellaan, Zwolle, the Netherlands

• Pipe connection

The invention relates to a pipe connection, the at least one socket pipe part made of thermoplastic material and a male tube part which is welded to the inside of the socket tube part.

Such pipe connections in which a plug-in pipe part made of polyethylene with the inside of a socket pipe part is welded are known. To produce a perfect welded connection, it is necessary that the socket pipe part and the one-corner tube part pushed into one another in a centered manner will. This requires the use of devices with means of attack, with respect to the socket pipe part can be attached centered. When using plastic hot pieces that have a relatively ■ · short length and / or on the outer circumference of the mouth have an increasing outer diameter, a

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Such a device due to the fact that the attack means are not able to use the the welding pressure exerted on the socket pipe part and / or are unable to hold the socket pipe part in the center during insertion,

The connection of such auxiliary pieces is therefore carried out by hand, which requires great skill with regard to a precisely centered insert. For reasons of operational safety It is therefore also necessary to check the welded joint, which causes undesirable costs.

The invention is based on the object of creating a pipe connection of the type specified at the beginning * which is the above-mentioned Avoids disadvantages and in particular always a perfect centering of welding members in relation to the socket pipe part enables.

This object is achieved according to the invention in that the socket pipe part carries stop centering projections on its outside.

With the help of such stop centering projections, a flawless one Arrangement of the welding links from the mouth of the socket pipe part ensured. This gives the opportunity to have such pipe connections made by relatively untrained personnel.

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Advantageously, the stop center protrusions form a stop edge that ensures an excellent arrangement of the welding members with respect to the mouth of the socket pipe part.

The stop centering projections or the stop or abutment edge advantageously close to those extending in the longitudinal direction of the pipe Airfoils or a cylindrical or frustoconical Surface at, being a frustoconical surface preferably its greatest outer circumference at the point of the coin * tion of the socket pipe part.

It has been found to be useful in practice to use the aerofoils or the cylindrical or frustoconical Surface to be allowed to extend to the nearest mouth of the socket pipe part.

To pest the welding links, it can be useful to use the Airfoils or the cylindrical or frustoconical surface to be provided with a profiling, which is preferably designed in a helical shape, around the welding member to be able to screw on the socket pipe part. It is of course also possible to make transversely extending grooves, whereby one z. B. with two clamps the welding link in perfect condition Way can attach to the socket pipe part on the outside thereof.

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The socket pipe part and the plug-in pipe part are preferably made of polyolefins, e.g. B. homo- and copolymers of Ethylene, propylene, butylene and higher olefins.

Further features and advantages of the subject invention emerge from the claims and the following description in conjunction with the drawing, in which several exemplary embodiments are illustrated. In the drawing show:

1 shows a section through a pipe connection according to the invention with a socket pipe part composed of a double socket; where the Stop centering surfaces are designed differently at the two ends,

Pig. 2 a reducer,

Fig. 3 shows an arch piece,

Fig. ¹ I a sealing cap,

Fig. 5 is a branch piece and

Fig. 6 a T-piece,

In Fig. 1, a welded pipe connection is shown, which has a socket pipe part in the form of a double socket 1 and a Einsteckrohrteil 2, both made of polyethylene, has. The outside 5 of the plug-in pipe part 2 and the inside 6 of the socket pipe part in the form of the double sleeve 1 opposite the outside or surface 5 are by means of a welded connection

7 connected to each other. To get a proper amount of the insertion of the

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To ensure plug-in pipe part 2 with regard to the socket pipe part, the double socket 1 is provided on its inside with an inner stop edge or butt collar 8.

So that the plug-in pipe part 2 can be pushed into the socket pipe part 1 in a well-centered manner, are on the outside of the Ein-r plug-in tube part 2 welding links at the desired distance .from the Muzzle attached.

For this purpose, the socket pipe part is provided with stop centering projections on its outside 9 provided, which in the present case form an abutting edge. The stop surfaces of the stop centering projections .. or of the butt rim 9 are essentially perpendicular to the longitudinal axis of the plug-in pipe part in order to achieve even better centering to ensure.

To ensure that the welding links are correctly positioned on the outside of a socket pipe part, the outer circumference 3 of which increases towards the center of the pipe part, close nor on the stop centering projections or the abutment edge 9 in the longitudinal direction of the tube extending or cylindrical support surfaces 10 at. A frustoconical support surface 10 'can also be used. find application, in which case dfe frustoconical wing 10 '. preferably has its largest outer circumference at the mouth 4 of the socket pipe part.

The wings 10,10 'are advantageously with screw

Grooves 11 or

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helical grooves 1 * 1 screwing on the Swedish link allow on the wing until "it comes to rest on the edge 9 of the joint.

If a frustoconical wing is used, it is a Screwing is of course not possible. In this case, the welding member is clamped onto the frustoconical support surface 10 '. In order to ensure that the welding member is properly secured, transverse grooves 12 are preferably provided on this support surface.

The double socket 1 advantageously has a convex i
^: or barrel-shaped outer shape with a radius of curvature that is six to twelve times, preferably eight to ten times the outer diameter of the plug-in pipe part 2, while the

'. The total length of the double socket is equal to the outer diameter of the • insert pipe part.

These dimensions have proven to be very favorable in the manufacture of such a sleeve in the injection molding process, because of following shrinkage processes, deviations occur in the end product.

Due to the specified dimensions, you can use the injection molding process get a double socket in which the conicity of the opposing mouths 4 is not in terms of The conicity of the cone begins to change when the length between the mouths is equal to the outer diameter of the plug-in pipe part is chosen.

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The inner sides 6 ', 6 of the sleeve are' frustoconical, whereby the generatrix of the frustoconical surface forms an angle between 0 and 2.5 °, preferably between 1 and 2.5 °, with the Include the longitudinal axis of the pipe part and also the frustoconical Surface has the largest outer circumference at the mouth. In this way a perfect welded joint can be achieved are made when the plug-in pipe part 2 in the socket pipe part 1 is pushed.

As mentioned, the wing 10 'can also be designed in the shape of a truncated cone be in such a way that its greatest outer circumference is at the mouth lies. In this way, forces acting on the socket pipe part according to the invention are absorbed by the welding pressure.

As can be seen from the drawing, the wings extend 10 between the abutting edge 9 and the mouth of the socket pipe part. Instead, z. B. the abutting edge 9 with a larger Be attached at a distance from the mouth 4 and the wing 10 or 10 'end at a distance from the inlet opening 4,4'.

In Fig. 2, a reducer 12 ″ is shown, which as a sleeve 'pipe part can serve. This socket pipe part 12 'is in turn with an abutting edge 9 and with a cylindrical, up to close of the mouth 4 of the socket pipe part extending support surface 10 is provided.

In the bend according to FIG. 3, the abutment edge 9 is located

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The distance from the mouth and the free end of the cylindrical wing IO ends at the mouth 4.

The sealing cap shown in Fig. * L is with a butt edge 9 is provided with a support surface 10 which has transverse grooves 12 for fixing the welding members.

The branch piece shown in FIG. 5, which can also be a tapping saddle, has a joint edge 9 in the vicinity of the inlet end, to which a frustoconical support surface 10 adjoins, which extends from the mouth h to the joint edge 9.

The T-piece shown in Fig. 6 is at several points with butt edges 9 and cylindrical or frustoconical Airfoils 10 provided. Some cylindrical wings 10 end at a distance from the impact edges 9.

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Claims (10)

Patent claims: Pipe connection which has at least one socket pipe part made of thermoplastic material and a plug-in pipe part, which is welded to the inside of the socket pipe part, characterized in that the socket pipe part (1) on its Has outside stop centering projections (9). 2. Pipe connection according to claim 1, characterized in that the stop centering projections (9) form a face edge. 3. Pipe connection according to claim 1 or 2, characterized in that the stop surfaces of the centering projections (9) or of the abutting edge are aligned essentially perpendicular to the longitudinal axis of the socket pipe part (1). k. Pipe connection according to one of Claims 1 to 3, characterized in that the stop centering projections (9) are joined by supporting surfaces (10, 10 ') which run in the longitudinal direction of the pipe and are cylindrical or frustoconical, the frustoconical surfaces preferably having their largest outer circumference have at the mouth (4) of the socket pipe part (1). 5. Pipe connection according to one of claims 1 to ¹ I, characterized in that the supporting surfaces (10,1O ¹ ) extend to the nearest mouth (* 0 of the socket pipe part (1)). 409845/0358 6. Pipe connection according to one or more of claims 1 to 5, characterized in that the supporting surfaces (10 ₃ 10 ^f ) with an outer profiling (11; 12), in particular in the form of transverse grooves (12) or helically extending grooves (11) , are provided. 7. Pipe connection according to one or more of claims 1 part 6, characterized in that the socket pipe part (1) consists of a double socket with an inner butt collar (8). 8. Pipe connection according to one or more of claims to 7 »characterized in that · the socket pipe part consists of a Reducer, elbow, branch, T-piece or a sealing cap. · 9. Pipe connection according to one or more of claims to 8, characterized in that the double socket (1) of their The mouth (4) has an outer circumference with increasing size, the outer radius of curvature of the double socket being the six to Twelve times, preferably eight to ten times, the outer diameter of the plug-in pipe part (2) and the total length of the double socket is equal to the outer diameter of the plug-in pipe part is. 10. Pipe connection according to one or more of claims to 9 *, characterized in that the inside (636 *) of the socket pipe part (1) from the mouth (&) is frustoconical 409845/0358 runs, with the largest diameter of the truncated cone at the mouth, while the generatrix is at an angle of 0 to 2.5 °, preferably 1 to 2.5 °, with the longitudinal axis of the socket pipe part forms. 409845/0358 ι * · ♦ Blank page