EP0883771A1 - Pipe connection - Google Patents

Pipe connection

Info

Publication number
EP0883771A1
EP0883771A1 EP97917999A EP97917999A EP0883771A1 EP 0883771 A1 EP0883771 A1 EP 0883771A1 EP 97917999 A EP97917999 A EP 97917999A EP 97917999 A EP97917999 A EP 97917999A EP 0883771 A1 EP0883771 A1 EP 0883771A1
Authority
EP
European Patent Office
Prior art keywords
fitting
pipe
pipe connection
seal
connection according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP97917999A
Other languages
German (de)
French (fr)
Inventor
Rolf Diederichs
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mapress GmbH and Co KG
Original Assignee
Mannesmann AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mannesmann AG filed Critical Mannesmann AG
Publication of EP0883771A1 publication Critical patent/EP0883771A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
    • F16L13/14—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling
    • F16L13/141—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling by crimping or rolling from the outside
    • F16L13/142—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling by crimping or rolling from the outside with a sealing element inserted into the female part before crimping or rolling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
    • F16L13/14—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling
    • F16L13/16—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling the pipe joint consisting of overlapping extremities having mutually co-operating collars
    • F16L13/161—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling the pipe joint consisting of overlapping extremities having mutually co-operating collars the pipe or collar being deformed by crimping or rolling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
    • F16L13/10—Adhesive or cemented joints
    • F16L13/103—Adhesive joints
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/10—Coatings characterised by the materials used by rubber or plastics
    • F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S285/00—Pipe joints or couplings
    • Y10S285/915—Mastic

Definitions

  • the invention relates to a pipe connection according to the preamble of the main claim.
  • a so-called composite pipe is pushed onto a gunmetal fitting, the composite pipe consisting of an inner pipe that transports the liquid with an aluminum jacket and an overlying casing pipe that takes over the external protection.
  • Inner tube and cladding tube are made of plastic.
  • the fitting has a region extending in the longitudinal direction, which is provided with a stop, up to which the pipe to be connected is pushed on.
  • the area adjacent to the stop has two inner grooves, in each of which a sealing ring is arranged.
  • the rest of the section is heavily contoured so that the tube that is slid on can be molded into the contour during pressing.
  • the cuff has a radially inwardly extending web, which serves as a stop for the inserted tubes.
  • the end areas of the fitting are flanged inwards.
  • two spaced apart from the fitting Beads are formed in such a way that the inserted tube is pressed in in this area.
  • the disadvantage of this system is that the press jaw takes up a lot of space, so that pressing in narrow areas becomes impossible.
  • an extension is required for the majority of the fittings, especially for T-pieces, so that the pressing tongs can be attached.
  • connection for line pipes can be removed, consisting of a fitting having a socket on which a protective sleeve covering the socket is detachably arranged at a radial distance from the socket and a composite pipe, the end region of which with radial plastic deformation with the one sealing ring having connecting piece is connectable.
  • the protective sleeve is separated from the fitting and pushed back onto the pipe to such an extent that the end of the composite pipe can be radially pressed with a pressing pliers under deformation.
  • the protective sleeve After pressing and removing the crimping pliers, the protective sleeve is connected to the fitting as originally, so that the deformed area of the composite pipe is not visible from the outside, the pushed-on protective sleeve also forming a kink protection.
  • This line connection is very expensive to manufacture, since the socket of the fitting must be specially designed in order to secure and seal the composite pipe pressed thereon sufficiently.
  • the sealing point is so far removed from the end face of the socket of the fitting that a gap formation between the outer surface of the socket and the inner surface of the lifted composite pipe is not excluded.
  • a differently designed conduit connection is disclosed in DE-GM 74 06 802. This consists of a coupling ring made of thermoplastic plastic for connecting butt-jointed tube ends with outside reinforcements such as ribs, beads or the like.
  • Coupling ring has a circumferential bead which engages in the gap of the butt abutting pipe ends and ring surfaces which conically decrease in the outer diameter towards the coupling ring ends.
  • the coupling ring can be inserted into the pipe ends and can be firmly attached by gluing, preferably using a two-component adhesive.
  • This pipe connection has the Disadvantage that the pipes to be connected must be provided with external reinforcements to ensure the required rigidity of the connection.
  • the coupling ring must be provided with conical ring surfaces in order to ensure perfect bonding.
  • the object of the invention is to provide a pipe connection of the generic type, which consists of simple to produce elements, which is suitable for higher pressures and temperatures and in which the risk of gap formation is excluded.
  • An advantage of the pipe connection according to the invention is that the required positioning of the pushed-on pipe on the fitting can be recognized directly visually without any additional aids.
  • the metallic press connection which has been tried and tested for years by deforming the pipe and fitting, is retained, so that high axial
  • Area lying seal is also detected by the deformation. In this way, the formation of a gap between the outer surface of the fitting and the inner surface of the pushed-on pipe is prevented.
  • the stop is designed as a roof-like or flange-like bead to z. B. with presses or lathes in a simple manner.
  • the seal is preferably made of elastomer, e.g. B. butyl rubber, EPDM, fluororubber, etc. manufactured. Depending on the intended use, other sealing materials can also be used, especially with regard to higher temperatures and aggressive media to be transported.
  • a range of 0.5 to 10 mm is selected for the thickness of the seal, depending on the pipe diameter.
  • the end region of the fitting, including the stop can be pressed from a pipe section or can be made from solid material by turning or extrusion.
  • This basic element can be connected to an elbow, T-piece or threaded part by welding. As a special case, the stop can even be omitted if the element to be connected z. B. threaded part itself has a stop.
  • Another possibility of achieving the object is characterized in that a hardening adhesive is applied in the contact area between the outer surface of the fitting and the inner surface of the pushed-on pipe. This creates a cohesive connection that both the
  • a special adhesive e.g. used a two-component adhesive based on epoxy resin.
  • the advantage of this connection technology can be seen in the fact that no press tool is required at low line pressures.
  • the wall thicknesses for pipe and fitting can be selected to be very small, since they are not designed with regard to the pressing, but only have to withstand the internal pressure.
  • the thin wall of the fitting also has the advantage that the inner diameter of the line is only slightly reduced. If higher line pressures are required, this pipe connection can also be mechanically pressed for gluing.
  • the proposed system Compared to the glued pipe connections in fittings and pipes made of plastic, the proposed system has the advantage that the area of application is considerably larger with regard to temperature and internal pressure.
  • FIG. 1 shows a longitudinal section through a first embodiment of the pipe connection according to the invention FIG. 2 as FIG. 1, but a variant of the first embodiment
  • a first embodiment of the pipe connection according to the invention is shown in a longitudinal section, wherein the state before and in the right half the state after the pressing can be seen in the left half of the figure.
  • the core of the connection is a fitting 1 made of plastically deformable metal, which has a stop 2 extending radially outwards. This is followed at least on one side by a longitudinally extending cylindrical section 3, 3 '.
  • two smooth-ended conduit pipes 4, 4 'made of plastically deformable metal are pushed onto the fitting 1, namely up to the stop 2.
  • a seal 5,5 ' is arranged in the contact area between the fitting 1 and the conduit pipe 4, 4', between the outer surface of the cylindrical section 3, 3 'of the fitting 1 and the inner surface of the pushed-on tube 4,4'.
  • the outer surface of the seal can be 5.5 'with a
  • Figure 2 shows in the same longitudinal section a variant of the embodiment described above, wherein the same reference numerals have been used for the same parts.
  • the respective conduit 4, 4 ' is covered with a plastic jacket 9, 9' in a manner known per se.
  • the exterior outside of the cylindrical section 3, 3 'of the fitting 1 is covered with plastic 8 or coated with plastic paint.
  • Figure 3 has in the same longitudinal section as Figure 1, a further embodiment of the pipe connection according to the invention, wherein the same reference numerals have been used for the same parts.
  • a seal in the contact area between the outer surface of the fitting 1 and the inner surface of the respectively pushed pipe 4, 4 ', not a seal, but e.g. a curable adhesive 10, 10 'is arranged. After curing, this results in a material connection, the adhesive 10, 10 'taking on both the sealing function and the axial securing. Since the forces to be transmitted by such a connection are limited, a bead-like pressing can additionally be formed, as in FIG. 1. The adhesive connection will be sufficient for lower pressure levels, while the additional mechanical axial securing will be preferred for higher pressures and possibly additional vibration stresses on the lines.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Flanged Joints, Insulating Joints, And Other Joints (AREA)

Abstract

The invention relates to a pipe connection in a pipe whose smooth-ended end section is pushed onto a metal fitting which has at least one sheath-like region extending lengthways and provided with a stop element located at the start of the sheath region and projecting radially outwards; a seal is provided between the pipe and fitting, which are joined permanently with the aid of a press tool which is applied on the outside and deforms the pipe plastically. To make a pipe connection of this type suitable for high pressures and temperatures and usable in different application fields it is proposed that the pipe (4, 4') and fitting (1) should be made in the known way of plastically deformable metal and a seal (5, 5') should be provided in the contact region between the outer surface of the fitting (1) and the inner surface of the pipe (4, 4') fitted onto it, said seal covering the entire contact region; the contact region should be provided with at least one crimp-type deformation point (7') which forms the axial securing element at the fitting end and also grips the fitting (1); the distance between the deformation point (7) and the end face of the fitting (1) is small enough to ensure that the seal (5') in that region is also gripped by the deformation.

Description

Beschreibungdescription
RohrverbindungPipe connection
Die Erfindung betrifft eine Rohrverbindung gemäß dem Gattungsbegriff des Hauptanspruches.The invention relates to a pipe connection according to the preamble of the main claim.
Eine gattungsmäßige Rohrverbindung ist von der Firma Geberit bekannt (sieheA generic pipe connection is known from Geberit (see
Auszug aus dem Firmenprospekt). Bei diesem System wird auf einen Rotguß-Fitting ein sogenanntes Verbundrohr aufgeschoben, wobei das Verbundrohr aus einem die Flüssigkeit transportierenden Innenrohr mit einem Aluminiummantel und einem darüberliegenden, den Außenschutz übernehmenden Hüllrohr besteht. Innenrohr und Hüllrohr sind aus Kunststoff gefertigt. Der Fitting weist einen in Längsrichtung sich erstreckenden Bereich auf, der mit einem Anschlag versehen ist, bis zu dem das zu verbindende Rohr aufgeschoben wird. Der dem Anschlag benachbarte Bereich weist zwei Innennuten auf, in denen je ein Dichtring angeordnet ist. Der restliche Abschnitt ist stark konturiert, so daß sich das aufgeschobene Rohr bei der Verpressung in die Kontur einformen kann. Nach dem Aufschieben wird von außen eine Preßzange angesetzt und das Rohr sowohl im Dichtringbereich als auch im konturierten Bereich aufgepreßt. Dabei übernimmt der Dichtringbereich die Dichtfunktion und der konturierte Bereich die axiale Sicherung. Nachteilig bei diesem System ist, daß das Verbundrohr nur für einen engen Temperatur- und Druckbereich einsetzbar ist. Weiterhin ist der Fitting in seiner Herstellung sehr aufwendig, da die konturierten Endbereiche sowie der Dichtringbereich präzise hergestellt werden müssen.Extract from the company brochure). In this system, a so-called composite pipe is pushed onto a gunmetal fitting, the composite pipe consisting of an inner pipe that transports the liquid with an aluminum jacket and an overlying casing pipe that takes over the external protection. Inner tube and cladding tube are made of plastic. The fitting has a region extending in the longitudinal direction, which is provided with a stop, up to which the pipe to be connected is pushed on. The area adjacent to the stop has two inner grooves, in each of which a sealing ring is arranged. The rest of the section is heavily contoured so that the tube that is slid on can be molded into the contour during pressing. After being pushed on, a pair of crimping pliers is attached and the pipe is pressed on both in the sealing ring area and in the contoured area. The sealing ring area takes on the sealing function and the contoured area the axial securing. A disadvantage of this system is that the composite pipe can only be used for a narrow temperature and pressure range. Furthermore, the fitting is very complex to produce, since the contoured end regions and the sealing ring region have to be manufactured precisely.
Ein anderes Preßverbindungssystem ist von der Firma Deutsche ALWA GmbH bekannt (siehe Auszug aus dem Firmenprospekt). Bei diesem System für Kupferrohre und Fittings aus Kupfer ist im fast glattbündigen Fitting innen eine durchgehendeAnother press connection system is known from Deutsche ALWA GmbH (see excerpt from the company brochure). With this system for copper pipes and fittings made of copper there is a continuous inside in the almost flush-fitting fitting
Gummi-Manschette angeordnet. In der Mitte weist die Manschette einen radial nach innen sich erstreckenden Steg auf, der als Anschlag für die eingeschobenen Rohre dient. Zur axialen Fixierung der eingelegten Gummi-Manschette sind die stimseitigen Bereiche des Fittings nach innen umgebördelt. Mit einer eine breite Preßbacke aufweisenden Preßzange werden von außen auf dem Fitting zwei beabstandete Sicken angeformt und zwar so, daß das eingeschobene Rohr in diesem Bereich mit eingedrückt wird. Nachteilig bei diesem System ist, daß die Preßbacke viel Platz beansprucht, so daß die Verpressung in engen Bereichen unmöglich wird. Außerdem wird für den größten Teil der Fittings, insbesondere bei T-Stücken eine Verlängerung benötigt, damit die Preßzange angesetzt werden kann.Rubber cuff arranged. In the middle, the cuff has a radially inwardly extending web, which serves as a stop for the inserted tubes. In order to axially fix the inserted rubber sleeve, the end areas of the fitting are flanged inwards. With a wide pressing jaw having pressing pliers, two spaced apart from the fitting Beads are formed in such a way that the inserted tube is pressed in in this area. The disadvantage of this system is that the press jaw takes up a lot of space, so that pressing in narrow areas becomes impossible. In addition, an extension is required for the majority of the fittings, especially for T-pieces, so that the pressing tongs can be attached.
Der DE 91 13 050 U1 ist eine Verbindung für Leitungsrohre entnehmbar, bestehend aus einem einen Stutzen aufweisenden Fitting, auf dem lösbar im radialen Abstand zum Stutzen eine den Stutzen überdeckende Schutzhülse angeordnet ist und einem Verbundrohr, dessen Endbereich unter radialer plastischer Verformung mit dem einen Dichtring aufweisenden Stutzen verbindbar ist. Um das Ende des Verbundrohres mit dem Stutzen zu verbinden, wird die Schutzhülse vom Fitting getrennt und soweit auf das Rohr zurückgeschoben, daß das Ende des Verbundrohres mit einer Preßzange unter Deformation radial verpreßt werden kann. Nach dem Verpressen und Entfernen der Preßzange wird die Schutzhülse wie ursprünglich wieder mit dem Fitting verbunden, so daß der deformierte Bereich des Verbundrohres von außen nicht sichtbar ist, wobei die aufgeschobene Schutzhülse auch einen Knickschutz bildet. Diese Leitungsverbindung ist von der Herstellung her sehr aufwendig, da der Stutzen des Fittings besonders konstruiert sein muß, um das darauf verpreßte Verbundrohr ausreichend axial zu sichern und abzudichten. Darüber hinaus ist die Dichtstelle soweit von der Stirnseite des Stutzens des Fittings entfernt, so daß eine Spaltbildung zwischen Außenoberfläche des Stutzens und Innenoberfläche des aufgehobenen Verbundrohres nicht ausgeschlossen ist.DE 91 13 050 U1 is a connection for line pipes can be removed, consisting of a fitting having a socket on which a protective sleeve covering the socket is detachably arranged at a radial distance from the socket and a composite pipe, the end region of which with radial plastic deformation with the one sealing ring having connecting piece is connectable. In order to connect the end of the composite pipe to the connecting piece, the protective sleeve is separated from the fitting and pushed back onto the pipe to such an extent that the end of the composite pipe can be radially pressed with a pressing pliers under deformation. After pressing and removing the crimping pliers, the protective sleeve is connected to the fitting as originally, so that the deformed area of the composite pipe is not visible from the outside, the pushed-on protective sleeve also forming a kink protection. This line connection is very expensive to manufacture, since the socket of the fitting must be specially designed in order to secure and seal the composite pipe pressed thereon sufficiently. In addition, the sealing point is so far removed from the end face of the socket of the fitting that a gap formation between the outer surface of the socket and the inner surface of the lifted composite pipe is not excluded.
Eine anders gestaltete Leitungsrohrverbindung ist in der DE-GM 74 06 802 offenbart. Diese besteht aus einem aus thermoplastischem Kunststoff hergestellten Kupplungsring zum Verbinden stumpf aneinanderstoßender Rohrenden mit außenseitigen Verstärkungen wie Rippen, Wülsten oder dergleichen. DerA differently designed conduit connection is disclosed in DE-GM 74 06 802. This consists of a coupling ring made of thermoplastic plastic for connecting butt-jointed tube ends with outside reinforcements such as ribs, beads or the like. The
Kupplungsring weist eine in dem Spalt der stumpf aneinanderstoßenden Rohrenden eingreifende umlaufende Sicke sowie nach den Kupplungsringenden hin konisch sich im Außendurchmesser verringernde Ringflächen auf. Der Kupplungsring ist in die Rohrenden einsteckbar und durch Einkleben vorzugsweise mittels eines Zweikomponentenklebers stoffschlüssig befestigbar. Diese Rohrverbindung hat den Nachteil, daß die zu verbindenden Rohre mit außenliegenden Verstärkungen versehen werden müssen, um die geforderte Steifigkeit der Verbindung zu gewährleisten. Außerdem muß der Kupplungsring mit konischen Ringflächen versehen werden, um eine einwandfreie Verklebung zu gewährleisten.Coupling ring has a circumferential bead which engages in the gap of the butt abutting pipe ends and ring surfaces which conically decrease in the outer diameter towards the coupling ring ends. The coupling ring can be inserted into the pipe ends and can be firmly attached by gluing, preferably using a two-component adhesive. This pipe connection has the Disadvantage that the pipes to be connected must be provided with external reinforcements to ensure the required rigidity of the connection. In addition, the coupling ring must be provided with conical ring surfaces in order to ensure perfect bonding.
Aufgabe der Erfindung ist es, eine Rohrverbindung der gattungsmäßigen Art anzugeben, die aus einfach herzustellenden Elementen besteht, die für höhere Drücke und Temperaturen geeignet ist und bei der die Gefahr einer Spaltbildung ausgeschlossen ist.The object of the invention is to provide a pipe connection of the generic type, which consists of simple to produce elements, which is suitable for higher pressures and temperatures and in which the risk of gap formation is excluded.
Diese Aufgabe wird mit den im kennzeichnenden Teil der Ansprüche 1 und 4 angegebenen Merkmalen gelöst. Vorteilhafte Weiterbildungen sind Bestandteil von Unteransprüchen.This object is achieved with the features specified in the characterizing part of claims 1 and 4. Advantageous further developments are part of subclaims.
Vorteilhaft bei der erfindungsgemäßen Rohrverbindung ist, daß die erforderliche Positionierung des aufgeschobenen Rohres auf den Fitting ohne weitere Hilfsmittel unmittelbar visuell erkennbar ist. Die seit Jahren bewährte metallische Preßverbindung durch Verformung von Rohr und Fitting wird beibehalten, so daß hohe axialeAn advantage of the pipe connection according to the invention is that the required positioning of the pushed-on pipe on the fitting can be recognized directly visually without any additional aids. The metallic press connection, which has been tried and tested for years by deforming the pipe and fitting, is retained, so that high axial
Längskräfte und damit hohe Innendrücke übertragen werden können. In besonderen Fällen bei extrem hohen Anforderungen an die axiale Sicherheit kann es erforderlich sein, zwei oder mehr beabstandet voneinander liegende sickenartige Eindrückungen vorzusehen. Dabei ist erfindungswesentlich, daß der Abstand von der Verformungsstelle bis zur Stirnseite des Fittings so gering ist, daß die in diesemLongitudinal forces and thus high internal pressures can be transmitted. In special cases with extremely high demands on the axial safety, it may be necessary to provide two or more bead-like indentations spaced apart from one another. It is essential to the invention that the distance from the deformation point to the end face of the fitting is so small that the
Bereich liegende Dichtung von der Verformung miterfaßt wird. Auf diese Weise wird eine Spaltbildung zwischen Außenoberfläche des Fittings und Innenoberfläche des aufgeschobenen Rohres verhindert.Area lying seal is also detected by the deformation. In this way, the formation of a gap between the outer surface of the fitting and the inner surface of the pushed-on pipe is prevented.
In vorteilhafter Weise wird der Anschlag als dachartiger oder flanschartiger Wulst ausgebildet, um diesen z. B. mit Preß- oder Drehmaschinen in einfacher Weise herzustellen. Die Dichtung wird vorzugsweise aus Elastomer, z. B. Butylkautschuk, EPDM, Fluorkautschuk usw. hergestellt. Je nach Verwendungszweck können auch andere Dichtmaterialien eingesetzt werden, insbesondere im Hinblick auf höhere Temperaturen und aggressive zu transportierende Medien. Um die Querschnittsveränderung im Verbindungsbereich möglichst gering zu halten, wird abgestimmt auf die Rohrdurchmesser für die Dicke der Dichtung ein Bereich von 0,5 bis 10 mm gewählt. Der Endbereich des Fittings einschließlich des Anschlages kann aus einem Rohrabschnitt gepreßt oder durch Drehen oder Fließpressen aus Vollmaterial hergestellt werden. Dieses Grundelement kann mit einem Bogen, T-Stück oder Gewindeteil durch Schweißen verbunden werden. Als Sonderfall kann sogar der Anschlag entfallen, wenn das zu verbindende Element z. B. Gewindeteil selbst einen Anschlag aufweist.Advantageously, the stop is designed as a roof-like or flange-like bead to z. B. with presses or lathes in a simple manner. The seal is preferably made of elastomer, e.g. B. butyl rubber, EPDM, fluororubber, etc. manufactured. Depending on the intended use, other sealing materials can also be used, especially with regard to higher temperatures and aggressive media to be transported. To the To keep the cross-sectional change in the connection area as small as possible, a range of 0.5 to 10 mm is selected for the thickness of the seal, depending on the pipe diameter. The end region of the fitting, including the stop, can be pressed from a pipe section or can be made from solid material by turning or extrusion. This basic element can be connected to an elbow, T-piece or threaded part by welding. As a special case, the stop can even be omitted if the element to be connected z. B. threaded part itself has a stop.
Eine weitere Möglichkeit, die gestellte Aufgabe zu lösen, ist dadurch charakterisiert, daß im Kontaktbereich zwischen der Außenoberfläche des Fittings und der Innenoberfläche des aufgeschobenen Rohres ein aushärtender Kleber aufgebracht wird. Dadurch wird eine stoffschlüssige Verbindung hergestellt, die sowohl dieAnother possibility of achieving the object is characterized in that a hardening adhesive is applied in the contact area between the outer surface of the fitting and the inner surface of the pushed-on pipe. This creates a cohesive connection that both the
Dichtfunktion als auch die Sicherung gegen axiales Verschieben übernimmt. Vorzugsweise wird ein Spezialkleber, z.B. ein Zweikomponentenkleber auf Epoxyharzbasis verwendet. Der Vorteil dieser Verbindungstechnik ist darin zu sehen, daß bei geringen Leitungsdrücken kein Preßwerkzeug erforderlich ist. Die Wanddicken für Rohr und Fitting können in diesem Fall sehr gering gewählt werden, da sie nicht im Hinblick auf die Verpressung ausgelegt werden, sondern nur dem Innendruck standhalten müssen. Die Dünnwandigkeit auch des Fittings hat zudem den Vorteil, daß der Innendurchmesser der Leitung nur wenig vermindert wird. Werden höhere Leitungsdrücke gefordert, so kann diese Rohrverbindung zusätzlich zum Kleben mechanisch verpreßt werden.Sealing function as well as securing against axial displacement takes over. A special adhesive, e.g. used a two-component adhesive based on epoxy resin. The advantage of this connection technology can be seen in the fact that no press tool is required at low line pressures. In this case, the wall thicknesses for pipe and fitting can be selected to be very small, since they are not designed with regard to the pressing, but only have to withstand the internal pressure. The thin wall of the fitting also has the advantage that the inner diameter of the line is only slightly reduced. If higher line pressures are required, this pipe connection can also be mechanically pressed for gluing.
Gegenüber den verklebten Rohrverbindungen bei aus Kunststoff hergestellten Fittings und Rohrleitungen hat das vorgeschlagene System den Vorteil, daß der Einsatzbereich hinsichtlich Temperatur und Innendruck erheblich größer ist.Compared to the glued pipe connections in fittings and pipes made of plastic, the proposed system has the advantage that the area of application is considerably larger with regard to temperature and internal pressure.
Bei der Verlegung von Rohren kann es je nach Einsatzbereich z. B. ständig feuchter Raum erforderlich sein, die Außenoberfläche zu schützen. Als besonders vorteilhaft hat sich eine an sich bekannte Kunststoffbeschichtung der Rohre herausgestellt. Dies gilt auch für den äußeren Bereich des Anschlags des Fittings. ln der Zeichnung wird anhand einiger Ausführungsbeispiele die erfindungsgemäße Rohrverbindung näher erläutert.When laying pipes, depending on the area of application, e.g. B. constantly moist room may be required to protect the outer surface. A plastic coating of the pipes known per se has proven to be particularly advantageous. This also applies to the outer area of the fitting stop. The pipe connection according to the invention is explained in more detail in the drawing with the aid of a few exemplary embodiments.
Es zeigen:Show it:
Figur 1 einen Längsschnitt durch eine erste Ausführungsform der erfindungsgemäßen Rohrverbindung Figur 2 wie Fig. 1 , jedoch eine Variante der ersten Ausführungsform1 shows a longitudinal section through a first embodiment of the pipe connection according to the invention FIG. 2 as FIG. 1, but a variant of the first embodiment
Figur 3 wie Fig. 1 , jedoch eine weitere AusführungsformFigure 3 as Fig. 1, but a further embodiment
In Figur 1 ist in einem Längsschnitt eine erste Ausführungsform der erfindungsgemäßen Rohrverbindung dargestellt, wobei in der linken Bildhälfte der Zustand vor und in der rechten Bildhälfte der Zustand nach der Verpressung zu sehen ist. Kernstück der Verbindung ist ein Fitting 1 aus plastisch verformbarem Metall, der einen radial nach außen sich erstreckenden Anschlag 2 aufweist. Daran schließt sich wenigstens nach einer Seite ein in Längsrichtung sich erstreckender zylindrischer Abschnitt 3,3' an. In diesem Ausführungsbeispiel sind zwei glattendige Leitungsrohre 4,4' aus plastisch verformbarem Metall auf den Fitting 1 aufgeschoben, und zwar bis zum Anschlag 2. Im Kontaktbereich zwischen dem Fitting 1 und dem Leitungsrohr 4,4' ist zwischen der Außenoberfläche des zylindrischen Abschnittes 3,3' des Fittings 1 und der Innenoberfläche des aufgeschobenen Rohres 4,4' eine Dichtung 5,5' angeordnet. Diese Dichtung 5,5' erstreckt sich über den gesamten Kontaktbereich. Zur Erleichterung des Aufschiebens kann die Außenoberfläche der Dichtung 5,5' mit einerIn Figure 1, a first embodiment of the pipe connection according to the invention is shown in a longitudinal section, wherein the state before and in the right half the state after the pressing can be seen in the left half of the figure. The core of the connection is a fitting 1 made of plastically deformable metal, which has a stop 2 extending radially outwards. This is followed at least on one side by a longitudinally extending cylindrical section 3, 3 '. In this exemplary embodiment, two smooth-ended conduit pipes 4, 4 'made of plastically deformable metal are pushed onto the fitting 1, namely up to the stop 2. In the contact area between the fitting 1 and the conduit pipe 4, 4', between the outer surface of the cylindrical section 3, 3 'of the fitting 1 and the inner surface of the pushed-on tube 4,4', a seal 5,5 'is arranged. This seal 5.5 'extends over the entire contact area. To facilitate the pushing on, the outer surface of the seal can be 5.5 'with a
Flüssigkeit benetzt oder mit einem seifenähnlichen Mittel eingeschmiert werden. Die Dichtung 5,5' übernimmt bei dieser Ausführungsform die Abdichtung, so daß die zu transportierende Flüssigkeit nicht nach draußen dringen kann. Damit diese Verbindung auch die durch den Innendruck hervorgerufenen axialen Kräfte übertragen kann, werden ggf. und in Abhängigkeit vom Leitungsdruck nacheinander durch ein hier nicht dargestelltes Preßwerkzeug zwei sickenartige Verpreßstellen 6", 7" angeformt, von denen eine sickenartige Verpreßstelle 7' sich am Ende des zylindrischen Abschnittes 3,3' befindet. Die Verpreßstellen 6',7' sind dadurch gekennzeichnet, daß sowohl der Fitting 1 als auch das jeweilige aufgeschobene Rohr 4,4' mit verformt wird. Die Art der Anpressung z. B. sechskantförmige oder zitronenförmige Segmente hängt ab von der Konturierung des Maules der hier nicht dargestellten Preßbacken.Liquid wetted or lubricated with a soap-like agent. The seal 5,5 'takes over the seal in this embodiment, so that the liquid to be transported can not penetrate outside. So that this connection can also transmit the axial forces caused by the internal pressure, if necessary and depending on the line pressure, two bead-like pressing points 6 ", 7" are formed in succession by a pressing tool, not shown here, of which a bead-like pressing point 7 'is located at the end of the cylindrical section 3,3 '. The pressing points 6 ', 7' are characterized in that both the fitting 1 and the respective pushed-on pipe 4, 4 'are also deformed. The kind of Contact z. B. hexagonal or lemon-shaped segments depends on the contour of the mouth of the press jaws, not shown here.
Figur 2 zeigt im gleichen Längsschnitt eine Variante der zuvor beschriebenen Ausführungsform, wobei für gleiche Teile gleiche Bezugszeichen verwendet worden sind. Für Rohrverbindungen, bei denen z.B. ein unlegierter Stahl für den Fitting 1 und die Leitungsrohre 4,4' verwendet wird, kann es je nach Einsatzbereich erforderlich sein, die Außenoberfläche vor einem Korrosionsangriff zu schützen. Dazu wird in an sich bekannter Weise das jeweilige Leitungsrohr 4,4' mit einem Kunststoffmantel 9,9' überzogen. Ebenso wird das Äußere außerhalb des zylindrischen Abschnittes 3,3' des Fittings 1 mit Kunststoff 8 verkleidet oder mit Kunststoffarbe beschichtet. Beim Aufschieben der Leitungsrohre 4,4' muß darauf geachtet werden, daß die jeweilige Stirnfläche des Leitungsrohres 4,4' bis an die Umhüllung 8 des Anschlages 2 reicht.Figure 2 shows in the same longitudinal section a variant of the embodiment described above, wherein the same reference numerals have been used for the same parts. For pipe connections where e.g. If an unalloyed steel is used for the fitting 1 and the line pipes 4, 4 ', it may be necessary, depending on the area of application, to protect the outer surface from a corrosion attack. For this purpose, the respective conduit 4, 4 'is covered with a plastic jacket 9, 9' in a manner known per se. Likewise, the exterior outside of the cylindrical section 3, 3 'of the fitting 1 is covered with plastic 8 or coated with plastic paint. When pushing on the conduit 4, 4 ', care must be taken that the respective end face of the conduit, 4, 4' extends up to the casing 8 of the stop 2.
Bei der Anpressung der beiden sickenartigen Verpreßstellen 7,7' wird der Kunststoffmantel 9,9' mit verformt. Diese Vorgehensweise hat den Vorteil, daß eine Nacharbeit nach der Verpressung nicht oder nur in geringem Umfang erforderlich ist.When the two bead-like pressing points 7, 7 'are pressed on, the plastic jacket 9, 9' is also deformed. This procedure has the advantage that reworking after pressing is not necessary or only to a small extent.
Figur 3 weist im gleichen Längsschnitt wie Figur 1 eine weitere Ausführungsform der erfindungsgemäßen Rohrverbindung auf, wobei ebenfalls für gleiche Teile gleiche Bezugszeichen verwendet worden sind. Im Unterschied zu Figur 1 ist im Kontaktbereich zwischen der Außenoberfläche des Fittings 1 und der Innenoberfiäche des jeweils aufgeschobenen Rohres 4,4' nicht eine Dichtung, sondern z.B. ein aushärtbarer Kleber 10,10' angeordnet. Nach dem Aushärten ergibt dies eine stoffschlüssige Verbindung, wobei der Kleber 10,10' sowohl die Dichtfunktion als auch die axiale Sicherung übernimmt. Da die durch eine solche Verbindung zu übertragenden Kräfte begrenzt sind, kann vergleichbar wie in Figur 1 zusätzlich eine sickenartige Verpressung angeformt werden. Für niedrigere Druckstufen wird die Kleberverbindung ausreichend sein, während man für höhere Drücke und möglicherweise zusätzliche Schwingungsbeanspruchungen der Leitungen die zusätzliche mechanische axiale Sicherung bevorzugen wird. Figure 3 has in the same longitudinal section as Figure 1, a further embodiment of the pipe connection according to the invention, wherein the same reference numerals have been used for the same parts. In contrast to Figure 1, in the contact area between the outer surface of the fitting 1 and the inner surface of the respectively pushed pipe 4, 4 ', not a seal, but e.g. a curable adhesive 10, 10 'is arranged. After curing, this results in a material connection, the adhesive 10, 10 'taking on both the sealing function and the axial securing. Since the forces to be transmitted by such a connection are limited, a bead-like pressing can additionally be formed, as in FIG. 1. The adhesive connection will be sufficient for lower pressure levels, while the additional mechanical axial securing will be preferred for higher pressures and possibly additional vibration stresses on the lines.

Claims

Patentansprüche:Claims:
1. Rohrverbindung mit einem Rohr, dessen glattendiger Endabschnitt auf einen metallischen Fitting aufgeschoben ist, der mindestens einen in Längsrichtung sich erstreckenden hülsenartigen Bereich aufweist, der mit einem zu Beginn der Erstreckung liegenden, radial nach außen sich erstreckenden Anschlag versehen ist und bei der zwischen Rohr und Fitting eine Dichtung angeordnet ist und Rohr und Fitting mittels eines außen angesetzten das Rohr plastisch verformenden Preßwerkzeuges unlösbar miteinander verbunden ist, dadurch gekennzeichnet, daß Rohr (4,4') und Fitting (1) in bekannter Weise aus plastisch verformbarem Metall sind und im Kontaktbereich zwischen der Außenoberfläche des Fittings (1 ) und der Innenoberfläche des aufgeschobenen Rohres (4,4') eine über den gesamten Kontaktbereich sich erstreckende Dichtung (5,5') angeordnet ist und der Kontaktbereich mindestens eine am Fittingende die axiale Sicherung bildende sickenartige auch den Fitting (1) miterfassende Verformungsstelle (7') aufweist und der Abstand von der Verformungsstelle (7') bis zur Stirnseite des Fittings (1) so gering ist, daß die in diesem Bereich liegende Dichtung (5') von der Verformung miterfaßt wird.1. Pipe connection with a pipe, the smooth end portion of which is pushed onto a metallic fitting, which has at least one sleeve-like region extending in the longitudinal direction, which is provided with a stop lying at the beginning of the extension and extending radially outwards, and in the between the pipe and fitting a seal is arranged and pipe and fitting are inseparably connected to one another by means of an externally attached pressing tool which plastically deforms the pipe, characterized in that the pipe (4, 4 ') and fitting (1) are made of plastically deformable metal in a known manner and in A gasket (5,5 ') extending over the entire contact area is arranged between the outer surface of the fitting (1) and the inner surface of the pushed-on tube (4,4') and the contact area also has at least one bead-like at the fitting end which forms the axial securing means the fitting (1) telle (7 ') and the distance from the deformation point (7') to the end face of the fitting (1) is so small that the seal (5 ') lying in this area is also included in the deformation.
2. Rohrverbindung nach Anspruch 1 , dadurch gekennzeichnet, daß die Dichtung (5,5') aus einem Elastomer besteht.2. Pipe connection according to claim 1, characterized in that the seal (5,5 ') consists of an elastomer.
Rohrverbindung nach Anspruch 1 und 2, dadurch gekennzeichnet, daß die Dicke der Dichtung (5,5*) je nach Abmessung der Rohre (4,4') in einemPipe connection according to claim 1 and 2, characterized in that the thickness of the seal (5.5 * ) depending on the dimension of the pipes (4,4 ') in one
Bereich von 05, bis 10 mm liegt.Range from 05 to 10 mm.
4. Rohrverbindung mit einem Rohr, dessen Endabschnitt auf einen Fitting aufgeschoben ist, der mindestens einen in Längsrichtung sich erstreckenden, hülsenartigen Bereich aufweist, der mit einem zu Beginn der Erstreckung liegenden, radial nach außen sich erstreckenden Anschlag versehen ist und mittels eines über den gesamten Kontaktbereich zwischen der Außenoberfläche des Fittings und der Innenoberfläche des aufgeschobenen Rohres aufgebrachten Klebers eine stoffschlüssige Verbindung hergestellt wird, dadurch gekennzeichnet, daß das Rohr (4, 4') eine zylindrische glatte Außenoberfläche und einen glattendigen Endabschnitt aufweist und Rohr (4, 4') und Fitting (1) aus plastisch verformbarem Metall sind.4. Pipe connection with a pipe, the end section of which is pushed onto a fitting which has at least one sleeve-like region which extends in the longitudinal direction and is provided with a stop which lies at the beginning of the extension and extends radially outwards and by means of a stop over the whole Contact area between the outer surface of the fitting and of the inner surface of the pushed-on pipe adhesive, a material connection is produced, characterized in that the pipe (4, 4 ') has a cylindrical smooth outer surface and a smooth end section and pipe (4, 4') and fitting (1) are made of plastically deformable metal.
5. Rohrverbindung nach Anspruch 4, dadurch gekennzeichnet, daß der Kleber (10,10') ein Zweikomponentenkleber auf Epoxyharzbasis ist.5. Pipe connection according to claim 4, characterized in that the adhesive (10, 10 ') is a two-component adhesive based on epoxy resin.
6. Rohrverbindung nach Anspruch 4 und 5, dadurch gekennzeichnet, daß bei hohen Innendrücken der Kontaktbereich mindestens eine die axiale6. Pipe connection according to claim 4 and 5, characterized in that at high internal pressures the contact area at least one the axial
Sicherung unterstützende das Rohr (4,4') und den Fitting (1) miterfassende sickenartige Verformungsstelle (6', 7') aufweist.Fuse supporting the pipe (4,4 ') and the fitting (1) with the bead-like deformation point (6', 7 ').
7. Rohrverbindung nach Anspruch 1 oder 4, dadurch gekennzeichnet, daß Rohr (4,4') und Fitting (1) aus nichtrostendem Stahl (Edelstahl) sind.7. Pipe connection according to claim 1 or 4, characterized in that the tube (4,4 ') and fitting (1) are made of stainless steel (stainless steel).
8. Rohrverbindung nach Anspruch 1 oder 4, dadurch gekennzeichnet, daß Rohr (4,4') und Fitting (1 ) aus Titan sind.8. Pipe connection according to claim 1 or 4, characterized in that the tube (4,4 ') and fitting (1) are made of titanium.
9. Rohrverbindung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß der Fitting (1 ) außerhalb des zylindrischen Abschnittes (3,3') mit einem Korrosionsschutzmittel (8) versehen ist.9. Pipe connection according to one of claims 1 to 8, characterized in that the fitting (1) outside the cylindrical section (3,3 ') is provided with an anti-corrosion agent (8).
10. Rohrverbindung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Außenoberfläche des Rohres (4,4') mit einem Korrosionsschutzmittel versehen ist. 11. Rohrverbindung nach Anspruch 9 oder 10, dadurch gekennzeichnet, daß das Korrosionsschutzmittel eine Kunststoffbeschichtung (10,10') ist.10. Pipe connection according to one of claims 1 to 8, characterized in that the outer surface of the tube (4,4 ') is provided with an anti-corrosion agent. 11. Pipe connection according to claim 9 or 10, characterized in that the anti-corrosion agent is a plastic coating (10,10 ').
+++++++ +++++++
EP97917999A 1996-02-28 1997-02-19 Pipe connection Withdrawn EP0883771A1 (en)

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DE19609257A DE19609257C2 (en) 1996-02-28 1996-02-28 Pipe connection
DE19609257 1996-02-28
PCT/DE1997/000365 WO1997032153A1 (en) 1996-02-28 1997-02-19 Pipe connection

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JP (1) JP2000505531A (en)
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CA (1) CA2248301A1 (en)
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Also Published As

Publication number Publication date
US6059338A (en) 2000-05-09
KR19990087281A (en) 1999-12-27
DE19609257C2 (en) 1998-08-20
CN1212750A (en) 1999-03-31
CA2248301A1 (en) 1997-09-04
WO1997032153A1 (en) 1997-09-04
DE19609257A1 (en) 1997-09-04
JP2000505531A (en) 2000-05-09
CZ276298A3 (en) 1999-03-17
PL328869A1 (en) 1999-03-01

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