DE3404294C1

DE3404294C1 - Thermoplastic pipe fitting

Info

Publication number: DE3404294C1
Application number: DE19843404294
Authority: DE
Inventors: Günter Dipl.-Ing.(FH) 5210 Troisdorf Simons
Original assignee: Henze 5210 Troisdorf GmbH; Henze GmbH
Current assignee: Henze Kunststoffwerk 5210 Troisdorf De GmbH
Priority date: 1984-02-08
Filing date: 1984-02-08
Publication date: 1986-03-20

Abstract

The pipe fitting (1) made of thermoplastic is intended in particular for use as a pipe branch in pressure pipeline systems. The pipe body (2) of the pipe fitting (1) has a collar (5) which is made of a multilayer sheet material, has one or more branch bores (3) and a connection piece (4) for an outgoing pipe section, which connection piece (4) is worked out of the material of the collar (5) by machining around the branch bore (3). The pipe body (2) experiences, on account of the wrapping with extruded thermoplastic sheet material, a lasting reinforcement particularly in the region of the highly stressed branch. This avoids expensive additional construction measures. Extruded pipes can be welded onto the cylindrical connection piece of the pipe fitting (1) by heated-tool welding using existing machines. In addition, due to the wrapping of the pipe body (2) in the region of the collar (5) and the associated thermal treatment of the extruded pipe body (2) the extruded pipe body (2) which is used as starting material and is conditioned the inherent stresses caused by manufacturing are reduced to a minimum. <IMAGE>

Description

Dadurch werden teuere zusätzliche Baumaßnahmen wie bei den bekannten T-Rohrstücken von Rohrleitungssystemen mit größeren Rohrabmessungen nicht notwendig. An die zylindrischen An#schlüsse des Rohrformstückes können extrudierte Rohre aus thermopla-As a result, expensive additional construction measures as with the known ones T-pipe sections of pipeline systems with larger pipe dimensions are not necessary. Extruded pipes can be connected to the cylindrical connections of the pipe fitting thermoplastic

stischem Kunststoff durch Heizelement-Schweißung angeschweißt werden. Außerdem wird durch das Umwickeln im Bereich des Kragens und durch die damit verbundene Wärmebehandlung der als Ausgangsmaterial verwendete extrudierte Rohrkörper getempert, und die herstellungsbedingten Eigenspannungen werden auf ein Minimum reduziert.elastic plastic can be welded by means of heating element welding. In addition, the wrapping around the collar and the associated Heat treatment of the extruded pipe body used as the starting material, tempered, and the production-related internal stresses are reduced to a minimum.

Zur Herstellung derartiger Rohrformstücke kann ein auf Länge geschnittener extrudierter Rohrkörper mit üblichen Abmessungen durch mehrlagiges Umwickeln mit Bandmaterial aus thermoplastischem Kunststoff in einfacher Weise ganz nach Bedarf verstärkt werden, wobei das Wickelextrudat mit dem extrudierten Rohrkörper in einem Herstellungsgang homogen verschmolzen wird. To produce such pipe fittings, a cut to length can be used extruded tubular body with the usual dimensions by wrapping with multiple layers Tape material made of thermoplastic material in a simple manner as required be reinforced, the wound extrudate with the extruded tubular body in one Production process is fused homogeneously.

Nach seiner Fertigstellung wird der Kragen an dem Rohrformstück spanend bearbeitet, wobei zunächst die beiden axialen Enden des Kragens rechtwinklig zur Rohrachse unter gleichzeitiger Ausbildung einer Hohlkehle abgedreht werden. Diese Hohlkehle ist zur Vermeidung von Spannungsrissen, die sonst durch Kerbspannungen hervorgerufen werden, besonders wichtig. After its completion, the collar is machined on the pipe fitting machined, initially the two axial ends of the collar at right angles to Pipe axis can be turned off with the simultaneous formation of a fillet. These Fillet is to avoid stress cracks that would otherwise be caused by notch stress are particularly important.

Anschließend wird an dem Kragen in dem geforderten Winkel zur Rohrachse eine Fläche gedreht oder gefräst. Auf dieser Fläche wird dann rechtwinklig eine Bohrung eingebracht. Sodann wird rings um die Bohrung ein zylindrischer Anschlußstutzen gedreht, der dem Querschnitt des abgehenden Rohrstranges entspricht, wobei auch das den Anschlußstutzen umgebende Material des Kragens rings um den Anschlußstutzen flächig abgedreht wird. Then on the collar at the required angle to the pipe axis turned or milled a surface. On this surface there is then a right-angled Drilled hole. A cylindrical connection piece is then placed around the bore rotated, which corresponds to the cross section of the outgoing pipe string, with also the material of the collar surrounding the connection piece around the connection piece is turned flat.

Die Erfindung wird im folgenden anhand eines in der Zeichnung schematisch dargestellten bevorzugten Ausführungsbeispiels näher erläutert. Es zeigen F i g. 1 einen als Vormaterial dienenden zylindrischen Rohrkörper in perspektivischer Ansicht, F i g. 2 einen Längsschnitt durch den Rohrkörper, F i g. 3 den Rohrkörper nach mehrmaligem Umwikkeln mit Bandmaterial unter Ausbildung eines im wesentlichen zylindrischen Kragens in perspektivischer Ansicht, Fig.4 einen Längsschnitt durch den umwickelten Rohrkörper von F i g. 3, F i g. 5 eine perspektivische Ansicht des umwickelten Rohrkörpers nach spanender Bearbeitung und Herstellung zweier Bohrungen an dem Kragen, Fig.6 einen Längsschnitt durch den umwickelten Rohrkörper von F i g. 5, Fig. 7 eine perspektivische Ansicht des spanend bearbeiteten Rohrformstückes nach Ausbildung von zylindrischen Anschlußstutzen im Bereich der beiden Bohrungen und Fig.8 einen Längsschnitt durch das fertige Rohrformstück von F i g. 7. The invention is illustrated schematically below with reference to one in the drawing illustrated preferred embodiment explained in more detail. It shows F i g. 1 a cylindrical tubular body serving as a starting material in a perspective view, F i g. 2 shows a longitudinal section through the tubular body, FIG. 3 the tubular body after several times Wrapping with tape material to form a substantially cylindrical Collar in perspective view, Figure 4 is a longitudinal section through the wrapped Tubular body of FIG. 3, fig. 5 is a perspective view of the wrapped tubular body after machining and production of two bores on the collar, Fig. 6 a longitudinal section through the wrapped tubular body of FIG. 5, Fig. 7 is a perspective View of the machined pipe fitting after the formation of cylindrical Connection piece in the area of the two bores and Fig. 8 a longitudinal section through the finished pipe fitting from FIG. 7th

Das in der Zeichnung in mehreren aufeinanderfolgenden Herstellungsschritten gezeigte Rohrformstück 1 besteht aus einem thermoplastischen Kunststoff, wie z. B. HD-PE (Niederdruck-Polyethylen), PP (Polypropylen), PVDF (Polyvinylidenfluorid) oder aus einem anderen geeigneten Kunststoffmaterial und ist insbesondere zum Einsatz als Rohrableitungsabzweig in Druckleitungssystemen bestimmt. Wie in F i g. 7 und 8 zu erkennen ist, hat das Rohrformstück 1 einen auf Länge ge schnittenen Rohrkörper 2 mit seitlichen Abzweigbohrungen 3, 3a, von denen jede von einem Anschlußstutzen 4, 4a im Bereich eines Kragens 5 umgeben ist. Der Kragen 5 ist über einen Teil der Länge des Rohrkörpers 2 aus einem extrudierten mehrlagigen Bandmaterial derart ausgebildet, daß der Rohrkörper 2 mit seinen beiden Enden in eine Rohrleitung aus thermoplastischem Kunststoff mit entsprechenden Abmessungen in üblicher Weise eingeschweißt werden kann. Der Kragen 5 weist als Abzweigbohrungen 3, 3a eine Querbohrung 3 und eine schräge Abzweigbohrung 3a auf und trägt rings um jede Abzweigbohrung 3, 3a einen aus ihm einstückig herausgearbeiteten Anschlußstutzen 4, 4a, der jeweils dem Querschnitt von in der Zeichnung nicht dargestellten abgehenden Rohrsträngen entspricht. Der Kragen 5 ist im wesentlichen zylindrisch ausgebildet und hat im Bereich des Anschlußstutzens 4 eine zur Achse des Rohrkörpers 2 etwa parallele Abflachung 6 und an dem geneigten Anschlußstutzen 4a eine entsprechend zur Rohrachse geneigte Abflachung 6a. Es können aber auch mehrere Abzweigbohrungen mit entsprechenden Abflachungen vorhanden sein. That in the drawing in several successive manufacturing steps Pipe fitting 1 shown consists of a thermoplastic material, such as. B. HD-PE (low-pressure polyethylene), PP (polypropylene), PVDF (polyvinylidene fluoride) or from another suitable plastic material and is used in particular intended as a pipe branch in pressure pipe systems. As in Fig. 7 and 8 can be seen, the pipe fitting 1 has a ge cut to length pipe body 2 with lateral branch bores 3, 3a, each of which has a connecting piece 4, 4a is surrounded in the area of a collar 5. The collar 5 is over part of the Length of the tubular body 2 formed from an extruded multi-layer strip material in such a way that the tubular body 2 with its two ends in a pipe made of thermoplastic Plastic with appropriate dimensions are welded in the usual way can. The collar 5 has, as branch bores 3, 3a, a transverse bore 3 and a inclined branch hole 3a and carries one around each branch hole 3, 3a from it in one piece worked out connecting piece 4, 4a, each of the cross-section corresponds to outgoing pipe strings not shown in the drawing. Of the Collar 5 is essentially cylindrical and has in the area of the connecting piece 4 a flattening 6 which is approximately parallel to the axis of the tubular body 2 and which is inclined Connection piece 4a has a flattened area 6a which is inclined correspondingly to the pipe axis. It can but there may also be several branch bores with corresponding flattened areas.

Bei der Herstellung derartiger Rohrformstücke 1 aus einem thermoplastischen Kunststoff wird so vorgegangen, daß ein in F i g. 1 und 2 gezeigter, zuvor auf Länge geschnittener extrudierter Rohrkörper 2 über einen wesentlichen Teil seiner Länge durch mehrlagiges Umwikkeln mit extrudiertem Bandmaterial aus thermoplastischem Kunststoff unter Ausbildung eines im wesentlichen zylindrischen Kragens 5 radial nach außen verstärkt wird, wie dies anhand von F i g. 3 und 4 gezeigt ist. In the production of such pipe fittings 1 from a thermoplastic Plastic is proceeded in such a way that one shown in FIG. 1 and 2 shown, previously to length cut extruded tubular body 2 over a substantial part of its length by wrapping around with extruded thermoplastic tape material Plastic with the formation of a substantially cylindrical collar 5 radially is reinforced to the outside, as shown in FIG. 3 and 4 is shown.

Das Bandmaterial wird beim Umwickeln des Rohrkörpers 2 auf eine solche Temperatur erhitzt, daß die Lagen des Bandmaterials sowohl mit dem Rohrkörper 2 als auch untereinander fest verschweißt und verschmolzen werden.The tape material is when wrapping the tubular body 2 on such Heated temperature that the layers of tape material both with the tubular body 2 as well as firmly welded and fused to one another.

Nach der Fertigstellung des Kragens 5 an dem Rohrkörper 2-werden im Kragen nach dem Erkalten des Bandmaterials die Abzweigbohrungen 3, 3a quer bzw. After the completion of the collar 5 on the tubular body 2-be In the collar after the strip material has cooled down, the branch bores 3, 3a transversely or

winklig zur Achse des Rohrkörpers hergestellt und der Kragen 5 außerdem derart spanend bearbeitet, wie dies in Fig. 5 und 6 gezeigt ist. Der Kragen 5 wird dabei an jedem seiner beiden axialen Enden 5a, 5b unter Bildung einer Hohlkehle 7 stirnseitig abgedreht.made at an angle to the axis of the tubular body and the collar 5 as well machined in such a way as shown in FIGS. 5 and 6. The collar 5 will at each of its two axial ends 5a, 5b with the formation of a groove 7 turned off at the front.

Vor der Herstellung der Abzweigbohrungen 3, 3a wird der Kragen 5 zunächst im Bereich 8 des herzustellenden Anschlußstutzens 4 parallel zur Achse des Rohrkörpers 2 und im Bereich 8a an der gegenüberliegenden Seite winklig zur Rohrachse flach abgedreht. Anschließend wird an dem Kragen 5 jeweils rings um die Abzweigbohrungen 3, 3a der im wesentlichen zylindrische Anschlußstutzen 4, 4a hergestellt, wie dies an dem fertigen Rohrformstück 1 in F i g. 7 und 8 zu erkennen ist Der Querschnitt jedes der angedrehten Anschlußstutzen 4, 4a entspricht dabei dem Querschnitt eines abgehenden Rohrstranges, so daß diese Rohrstränge durch einfaches Stumpfschweißen mit dem Rohrformstück 1 fest und dauerhaft verbunden werden können. Before the branch bores 3, 3a are produced, the collar 5 initially in the area 8 of the connecting piece 4 to be produced parallel to the axis of the tubular body 2 and in the area 8a on the opposite side at an angle to Tube axis turned flat. Then on the collar 5 each around the Branch bores 3, 3a of the essentially cylindrical connecting pieces 4, 4a made, as is the case with the finished pipe fitting 1 in FIG. 7 and 8 can be seen the cross-section each of the screwed-on connecting pieces 4, 4a corresponds to the cross section of one outgoing pipe string, so that these pipe strings by simple butt welding can be firmly and permanently connected to the pipe fitting 1.

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Claims

Claim: pipe part made of a thermoplastic material, in particular for use in pressure pipe systems, the part being made of a multi-layer Band material is made, marked e i c h n e t that for one use as a pipe fitting, the pipe (2) has a collar (5) made of multi-layer strip material, by machining for at least one branch bore (3) with connecting piece (4) is editable.

The invention relates to a pipe part made of a thermoplastic material according to the preamble of the patent claim.

Because of the good chemical resistance of plastic pipes that z. B. made of HD-PE (low-pressure polyethylene), PP (polypropylene), PVDF (polyvinylidene fluoride) or made of another suitable plastic, these are Pipes are increasingly used in sewer construction. Such sewers and pipeline systems are sometimes also used as pressure lines. These Operating conditions are not a problem for the design of the pipes and their manufacture. When laying the pipelines, however, arise due to local, structurally necessary Measures many problems. Ancillary connections must be integrated into the main lines which are great difficulties in pressure pipe systems in the nominal size range above DN 300 prepare.

For pipe branches with the same or smaller pipe cross-section various outlets are known, but for pressure pipe systems with large Pipe cross-sections are not possible or are only possible to a limited extent. So there is for smaller ones Pipe dimensions up to about 315 mm pipe diameter injection-molded T-pipe sections, the however, they can only be produced economically in larger numbers. These However, the prerequisites for large pipe diameters are due to the high molding costs and the small number of pieces is not given. In addition, such larger pipe diameters also cannot be produced by injection molding.

It is also known to have such T-pipe pieces from several ends put together obliquely cut pipe parts, the obliquely cut Pipe parts are connected to one another by means of butt welding. Such through However, T-pipe sections made butt welds are not in the pressure class of the pipe can be subjected to pressure. There are also large pipe diameters in the weld very expensive, because the diagonally cut pieces of pipe run through when heated can deform the welding mirror at the interfaces largely in an uncontrolled manner.

This can only be counteracted by additional increased effort will.

The applications described above are therefore at large and thick-walled pipes set limits. The tools and Welding methods also do not allow reliable connections.

From DE-PS 20 648 a method for producing a tubular Hollow body by helically winding a single or multi-layer tape Made of thermoplastic with an insert made of a profile material around one Known core with the adjoining edges of the tape windings overlapping and the edges are welded to one another when the strip material is pressed against the insert will. However, this is made possible because of the flow properties of the thermoplastic Material not the production of a pipe fitting, as it is from GB-PS 12 22 041 appears as known. T-pipe pieces for pipelines with a small diameter of z. B. two inches made by complicated winding processes, by glass fiber rovings or tapes that are impregnated with polyester resin or are impregnated by intricate criss-cross winding around a mandrel or a corresponding shape to be laid around.

Except for the fact that such a winding process is complicated and a very precise specification of the winding shape as well as precise control during winding required in order to achieve a tight fit of the individual wrapping layers, polyester resins are also used here, which belong to the thermosetting plastics belong and to which hardeners and accelerators must be added so that after a The hardening process results in a dimensionally stable, stiff T-pipe section. Such moldings Thermoset plastic cannot then be welded into a pipeline will. It is just a mechanical connection by means of collars, flanges, loose flanges and screws are possible, which is why such T-pipe pieces are included as pipe branches Pressurized pipes made of thermoplastic spiral tubes are not suitable are.

A manufacture of pipe fittings from a thermoplastic However, plastic material using this known winding method comes also out of the question because of the flow properties of this material. Thermoplastic Plastic material must namely in the heat at certain elevated temperatures processed in which it is not dimensionally stable, so that in a winding process, as described in the aforesaid British patent, between the turns of the tape material would flow in an uncontrolled manner, so that a sufficiently pressure-resistant Pipe wall with uniform thickness and consistent strength properties cannot be made this way.

The invention is based on the object of producing pipe parts according to the preamble of claim, which are used as pipe fittings for pipe branches are particularly suitable with a large pipe diameter, both qualitatively and to improve economically.

This object is achieved according to the invention by the characterizing part of the single claim solved by the invention, the wall cross-section a usually extruded tubular body used as a starting material Plastic enlarged many times over. The tubular body learns from the wrapping with tape material made of thermoplastic material, especially in the area of the highly stressed Pipe branch a permanent reinforcement.