DE1081288B - Sleeve welding connection for plastic pipes - Google Patents

Sleeve welding connection for plastic pipes

Info

Publication number
DE1081288B
DE1081288B DESCH23584A DESC023584A DE1081288B DE 1081288 B DE1081288 B DE 1081288B DE SCH23584 A DESCH23584 A DE SCH23584A DE SC023584 A DESC023584 A DE SC023584A DE 1081288 B DE1081288 B DE 1081288B
Authority
DE
Germany
Prior art keywords
sleeve
socket
welding
pipe
plastic pipes
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.)
Pending
Application number
DESCH23584A
Other languages
German (de)
Other versions
DE1780854U (en
Inventor
Dipl-Ing Heinrich Schulz
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.)
HEINRICH SCHULZ DIPL ING
Original Assignee
HEINRICH SCHULZ DIPL ING
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 HEINRICH SCHULZ DIPL ING filed Critical HEINRICH SCHULZ DIPL ING
Priority to DESCH23584A priority Critical patent/DE1081288B/en
Publication of DE1081288B publication Critical patent/DE1081288B/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5057—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like positioned between the surfaces to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint
    • B29C65/342—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3472—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint
    • B29C65/3476—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint being metallic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/116—Single bevelled joints, i.e. one of the parts to be joined being bevelled in the joint area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1222—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1224—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a butt joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1226—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least one bevelled joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B29C66/52291—Joining tubular articles involving the use of a socket said socket comprising a stop
    • B29C66/52292—Joining tubular articles involving the use of a socket said socket comprising a stop said stop being internal
    • 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
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/02—Welded joints; Adhesive joints
    • F16L47/03—Welded joints with an electrical resistance incorporated in the joint
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3468—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special electrical connectors of windings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
    • B29C65/4815—Hot melt adhesives, e.g. thermoplastic adhesives

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Branch Pipes, Bends, And The Like (AREA)

Description

Hülsen-Schweißverbindung für Kunststoffrohre -Als Verbindung für Rohre aus schweißbaren Kunststoffen sind Stumpfschweißverbindungen und Muffenschweißverbindungen bekannt. Bei der Stumpfschweißverbindung werden die beiden Rohrenden mittels einer Heizplatte auf Schweiß temperatur gebracht und dann aneinandergedrückt und so miteinander verschweißt (Abb. 1). Bei der Muffenschweißverbindung werden die beiden Rohrenden auf der äußeren Oberfläche auf Schweißtemperatur erhitzt und mit einer darübergeschobenen Muffe, die auf der Innenoberfläche auf Schweißtemperatur erhitzt wurde, verbunden, wobei der dazu notwendige Druck mittels entsprechend geformter Zangen aufgebracht wird (Abb. 2). Gemäß einem weiteren bekannten Verfahren wird zur Erzielung der notwendigen Schweißwärme eine in der Muffe eingelegte elektrische Heizdrahtspirale verwendet (Abb. 3).Sleeve welded joint for plastic pipes -As a joint for pipes butt-welded joints and socket-welded joints are made of weldable plastics known. With the butt weld connection, the two pipe ends are connected by means of a Heating plate brought to welding temperature and then pressed together and so with each other welded (Fig. 1). With the socket weld connection, the two pipe ends are on the outer surface heated to welding temperature and with a pushed over it Socket, which has been heated to welding temperature on the inner surface, connected, the pressure required for this is applied by means of appropriately shaped pliers becomes (Fig. 2). According to a further known method, to achieve the necessary Welding heat an electric heating wire spiral inserted in the socket is used (Fig. 3).

Die vorliegende Erfindung benutzt diese elektrische Heizdrahtspirale zur Erzeugung der Schweißwärme bei der Herstellung von Hülsen-Schweißverbindungen. The present invention uses this electrical filament coil for generating the welding heat in the production of sleeve welded joints.

Die Erfindung vermeidet jedoch die Nachteile der bekannten Elektromuffenschweißverbindungen.However, the invention avoids the disadvantages of the known electric socket weld connections.

Diese Nachteile sind: 1. Die Drahtspirale muß in sehr - engen Windungen radial in die Schweißmuffe eingelegt werden, um die notwendige Heizfläche zur Erzielung der richtigen Schweißwärme zu erzeugen. Die engen Drahtlagen behindern das Zusammenfließen des erhitzten Grundmaterials von Muffe und Rohr. These disadvantages are: 1. The wire spiral must be very tightly wound be inserted radially into the welding socket in order to achieve the necessary heating surface to generate the correct welding heat. The tight layers of wire prevent it from flowing together of the heated base material of the socket and pipe.

2. Die radial gewickelte Drahtspirale ist gegen Verletzung anfällig, namentlich beim Zusammenstecken des Rohres mit der Muffe. 2. The radially wound wire spiral is prone to injury, especially when putting the pipe together with the socket.

3. Der erforderliche Schweißdruck kann bei dieser Schweißverbindung nicht kontrolliert werden. Er kann auch nur maximal die Höhe erreichen, die durch die Dehnspannung des zuerst warm werdenden Rohres gegenüber der Muffe entsteht. 3. The required welding pressure can be used for this welded joint not be controlled. He can also only reach a maximum of the height that through the tensile stress of the pipe that gets warm first is created in relation to the socket.

4. Eine zusätzliche Zufuhr von Schweißmaterial, wie sie bei den meisten bekannten Kunststoffschweißungen notwendig ist und wie sie bei der Schweißverbindung von Rohren mit Muffen zur Ausfüllung von Hohlräumen erforderlich wird, ist nicht möglich. Dies ist dann besonders nachteilig, wenn die praktisch unvermeidliche Toleranz im Rohraußendurchmesser stark negativ ist, so daß ein Spiel zwischen Rohr und Muffe entsteht. 4. An additional supply of welding material, as is the case with most known plastic welding is necessary and how it is in the welded connection of pipes with sleeves to fill cavities is not required possible. This is particularly disadvantageous when the practically inevitable tolerance is strongly negative in the pipe outer diameter, so that there is a play between pipe and socket arises.

Ebenso nachteilig wirkt sich die Unmöglichkeit Schweißgut nachzudrücken, dann aus, wenn Muffe oder Rohr oder beide nicht völlig rund sind und hierdurch kleine Hohlräume nach dem Zusammenstecken entstehen. The impossibility to press in the weld metal is just as disadvantageous, off when the socket or pipe or both are not completely round and therefore small Cavities arise after plugging together.

5. Die erfolgreich vollzogene Schweißung oder die mangelhafte Schweißung ist bei diesem bekannten Verfahren optisch nicht erkennbar. Fehlschweißungen zeigen sich erst durch auftretende Leckstellen, oder sie sind erst nach Zerstörung der Schweißverbindung feststellbar. 5. The successfully completed weld or the defective weld is not visually recognizable in this known method. Show faulty welds only through leaks that occur, or they are only after the destruction of the Detectable weld connection.

Die Erfindung vermeidet diese Mängel. Ein Ausführungsbeispiel der Erfindung ist in den Abb. 4 und 5 dargestellt. Die Schweißverbindung zwischen Rohr und Muffe wird unter Zwischenschaltung einer keilförmigen Schweißhülse bewerkstelligt. Diese Hülse hat eine zylindrische Bohrung. Ihre Außenfläche ist konisch. Die Heizdrahtspirale ist nicht radial, sondern axial um die Hülse gewickelt. Die Hülse besteht aus demselben Grundmaterial wie Rohr und Muffe. Die Muffe ist entsprechend der Konizität der Hülse konisch ausgebildet, so daß die konische Außenfläche der Hülse in die konische Innenfläche der Muffe hineinpaßt, und zwar so, daß die Hülse nach dem schlüssigen Zusammenstecken von Rohr, Muffe und Hülse um einige Millimeter aus der Muffe herausragt. Während des Schweißvorganges -- also dem Einschalten des Heizstromes - wird die Hülse durch eine Zange (Abb. 6) in den Konus der Muffe hineingedrückt. The invention avoids these shortcomings. An embodiment of the The invention is shown in Figs. The welded joint between the pipe and socket is accomplished with the interposition of a wedge-shaped welding sleeve. This sleeve has a cylindrical bore. Their outer surface is conical. The heating wire spiral is not wound radially but axially around the sleeve. The sleeve consists of the same Basic material such as pipe and sleeve. The sleeve is corresponding to the conicity of the sleeve conical so that the conical outer surface of the sleeve into the conical inner surface the sleeve fits into it, in such a way that the sleeve after the close fitting together of the pipe, socket and sleeve protrudes a few millimeters from the socket. While of the welding process - i.e. switching on the heating current - the sleeve is through a pair of pliers (Fig. 6) pressed into the cone of the socket.

Die Verwendung von keilförmigen Ringen als Hilfsmittel zur Herstellung von Rohrverbindungen für Kunststoffrohre ist bereits bekannt (vgl. z. B. The use of wedge-shaped rings as an aid to manufacture of pipe connections for plastic pipes is already known (see e.g.

USA.-Patentschrift 2 430 657 und die eingetragenen Unterlagen der deutschen Gebrauchsmuster 1 739 300 und 1 721 494). Diese Hilfsmittel sind jedoch nur Elemente zur Herstellung von Schraubverbindungen zwischen Kunststoffrohren. Sie dienen dazu, einen Preßsitz der zu verschraubenden Rohrenden zu e zwingen.USA. Patent 2,430,657 and the registered documents of German utility models 1 739 300 and 1 721 494). However, these tools are only elements for making screw connections between plastic pipes. They serve to force a press fit of the pipe ends to be screwed together.

Die Vorteile der erfindungsgemäßen Hülsen-Schweißverbindung sind folgende: 1. Die axial gewickelte Drahtspirale läßt bei gleich großer Heizfläche gegenüber der Radialwicklung doppelt soviel freien Querschnitt für den Materialfluß beim Schweißvorgang frei, da sich die Heizfläche auf Innen- und Außenseite der Hülse aufteilt. The advantages of the sleeve-welded connection according to the invention are the following: 1. The axially wound wire spiral leaves the same size heating surface twice as much free cross-section for the flow of material as compared to the radial winding free during the welding process, as the heating surface is on the inside and outside of the sleeve divides.

2. Die Drahtwicklung kann sich durch Reibbeanspruchung beim Einschieben von Rohr, Muffe und Hülse nicht verschieben. Auf diese Weise wird eine Beschädigung des Drahtes oder ein Windungsschluß verhindert.2. The wire winding can become loose due to frictional stress when inserting it Do not move the pipe, socket or sleeve. This way there will be damage of the wire or a shorted turn.

3. Der erforderliche Schweißdruck kann durch das Anziehen der Zange in jeder gewollten Stärke erzwungen werden.3. The required welding pressure can be achieved by tightening the pliers be enforced in any desired strength.

4. Das unter Zangendruck stehende schweiß fähige Material der Hülse fließt beim Schweißvorgang zwischen Rohr und Muffe in eventuell vorhandene Hohlräume hinein.4. The weldable material of the sleeve that is under pressure from the pliers flows into any cavities that may be present between the pipe and socket during the welding process into it.

5. Die Güte der erfolgten Verschweißung läßt sich dadurch optisch erkennen, daß das aus der Muffe ursprünglich herausragende Teil der Hülse nach vollzogener, erfolgreicher Schweißung sich etwas zur Muffe hin verkürzt hat.5. The quality of the weld that has taken place can thus be seen visually recognize that the part of the sleeve that originally protruded from the socket after completed, successful welding has shortened slightly towards the socket.

PATENTANSPROCHE: 1. Hülsen-Schweißverbindung für KunststoK-rohre, dadurch gekennzeichnet, daß als Zusatzwerkstoff zur Verschweißung von Rohr und Muffe eine keilförmige Schweißhülse dient, die eine sich in axialer Richtung erstreckende, für diesen Zweck an sich bekannte elektrische Heizdrahtspirale trägt. PATENT APPLICATION: 1. Sleeve welded joint for plastic pipes, characterized in that as a filler material for welding pipe and socket a wedge-shaped welding sleeve is used, which is an axially extending, for this purpose known electric heating wire spiral carries.

Claims (1)

2. Hülsen-Schweißverbindung für Kunststoffrohre nach Anspruch 1, dadurch gekennzeichnet, daß die Schweißhülse eine zylindrische Innenfläche und eine konische Außenfläche besitzt. 2. sleeve welded joint for plastic pipes according to claim 1, characterized in that the welding sleeve has a cylindrical inner surface and a has a conical outer surface. In Betracht gezogene Druckschriften: USA.-Patentschriften Nr. 2 739 829, 2 430 657; deutsche Gebrauchsmuster Nr. 1 739 300, 1 721 494. References considered: U.S. Patents No. 2,739 829, 2,430,657; German utility model No. 1 739 300, 1 721 494.
DESCH23584A 1958-02-20 1958-02-20 Sleeve welding connection for plastic pipes Pending DE1081288B (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2399601A1 (en) * 1977-08-05 1979-03-02 Vahlbrauk Karl Heinz DEVICE FOR MAKING THE JUNCTION OF TWO TUBE ENDS
EP0024179A1 (en) * 1979-08-14 1981-02-25 Ube Industries, Ltd. Electrical heating element and process for preparation thereof
WO1989012545A1 (en) * 1988-06-22 1989-12-28 Raychem Corporation Methods and devices which make use of conductive polymers to join articles
FR2648077A1 (en) * 1989-06-09 1990-12-14 Boulet D Auria Terlizzi Method of joining two tubular elements made of plastic by electrofusion (electrical fusion bonding) and electrofusion coupling for implementing this method
DE9100017U1 (en) * 1991-01-03 1991-04-18 Donath, Dieter, 2081 Appen Plug connection for pipes made of thermoplastics
US5358988A (en) * 1990-11-14 1994-10-25 Henkel Kommanditgesellschaft Auf Aktien Water-in-oil emulsions
WO1995015253A1 (en) * 1993-11-30 1995-06-08 Uponor Limited Joining of hollow elongate members
DE102007014049B3 (en) * 2007-03-21 2008-12-04 Friatec Ag Compensation element for connecting components

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2430657A (en) * 1943-05-06 1947-11-11 John G Zolleis Coupling
US2739829A (en) * 1950-08-05 1956-03-27 American Viscose Corp Plastic pipe joint
DE1721494U (en) * 1956-02-22 1956-05-03 Georg Fischer & Gf & Ag PIPE CONNECTION FOR DOUBLE-WALLED PIPES.
DE1739300U (en) * 1956-10-20 1957-02-07 Josef Schmidbauer PIPE CONNECTION FOR PLASTIC PIPES.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2430657A (en) * 1943-05-06 1947-11-11 John G Zolleis Coupling
US2739829A (en) * 1950-08-05 1956-03-27 American Viscose Corp Plastic pipe joint
DE1721494U (en) * 1956-02-22 1956-05-03 Georg Fischer & Gf & Ag PIPE CONNECTION FOR DOUBLE-WALLED PIPES.
DE1739300U (en) * 1956-10-20 1957-02-07 Josef Schmidbauer PIPE CONNECTION FOR PLASTIC PIPES.

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2399601A1 (en) * 1977-08-05 1979-03-02 Vahlbrauk Karl Heinz DEVICE FOR MAKING THE JUNCTION OF TWO TUBE ENDS
EP0024179A1 (en) * 1979-08-14 1981-02-25 Ube Industries, Ltd. Electrical heating element and process for preparation thereof
WO1989012545A1 (en) * 1988-06-22 1989-12-28 Raychem Corporation Methods and devices which make use of conductive polymers to join articles
FR2648077A1 (en) * 1989-06-09 1990-12-14 Boulet D Auria Terlizzi Method of joining two tubular elements made of plastic by electrofusion (electrical fusion bonding) and electrofusion coupling for implementing this method
US5358988A (en) * 1990-11-14 1994-10-25 Henkel Kommanditgesellschaft Auf Aktien Water-in-oil emulsions
DE9100017U1 (en) * 1991-01-03 1991-04-18 Donath, Dieter, 2081 Appen Plug connection for pipes made of thermoplastics
WO1995015253A1 (en) * 1993-11-30 1995-06-08 Uponor Limited Joining of hollow elongate members
DE102007014049B3 (en) * 2007-03-21 2008-12-04 Friatec Ag Compensation element for connecting components
US8455067B2 (en) 2007-03-21 2013-06-04 Friatec Aktiengesellschaft Compensation element for joining components

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