WO1997013996A1 - Sleeve for joining pipes - Google Patents

Sleeve for joining pipes Download PDF

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Publication number
WO1997013996A1
WO1997013996A1 PCT/IB1996/001069 IB9601069W WO9713996A1 WO 1997013996 A1 WO1997013996 A1 WO 1997013996A1 IB 9601069 W IB9601069 W IB 9601069W WO 9713996 A1 WO9713996 A1 WO 9713996A1
Authority
WO
WIPO (PCT)
Prior art keywords
sleeve body
sleeve
parts
web
wall
Prior art date
Application number
PCT/IB1996/001069
Other languages
German (de)
French (fr)
Inventor
Heinrich Hillinger
Original Assignee
Heinrich Hillinger
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 Hillinger filed Critical Heinrich Hillinger
Publication of WO1997013996A1 publication Critical patent/WO1997013996A1/en

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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
    • 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"
    • B29C65/3404—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
    • B29C66/12—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
    • B29C66/50—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
    • 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
    • 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
    • B29C66/52294—Joining tubular articles involving the use of a socket said socket comprising a stop said stop being heated
    • 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
    • B29C66/63—Internally supporting the article during joining
    • B29C66/634—Internally supporting the article during joining using an inflatable core
    • 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
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8145—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81455—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps being a fluid inflatable bag or bladder, a diaphragm or a vacuum bag for applying isostatic pressure
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/97—Checking completion of joining or correct joining by using indications on at least one of the joined parts
    • B29C66/972—Checking completion of joining or correct joining by using indications on at least one of the joined parts by extrusion of molten material
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined

Definitions

  • the invention relates to a sleeve with a sleeve-shaped sleeve body made of plastic, in particular thermoplastic material for connecting pipe parts made of thermoplastic plastic, with a heating conductor embedded in the sleeve body near the inner wall of the sleeve body, two pipe parts to be connected to one another with each other directed end faces can be inserted into the sleeve body and the sleeve body and the ends of the pipe parts overlapped by it can be welded to one another after partial melting by heat generation in the heating conductor.
  • So-called electric welding sleeves of the type mentioned above are known for connecting pipeline parts made of thermoplastic materials , in which a metered amount of heat sufficient to connect the parts is generated by supplying electrical energy.
  • the known sleeves can scarcely achieve a uniform melting and secure welding in the region of the end faces of the pipeline parts to be connected.
  • annular web protrudes from the inner wall of the sleeve body as a stop and an additional welding point for the end faces of the pipeline parts and the heating conductor also extends into the web.
  • Pipe parts are understood here to mean all elements used in pipeline construction, such as pipe pieces, fittings, valves and other workpieces, which have cylindrical ends which can be connected by a sleeve.
  • the sleeve body and the pipeline parts to be connected to it are made of the same or a similar or related thermoplastic. Suitable materials include PVDF, PFA, PPS, PE, PB PP, FEP, PVC, and ABS.
  • the heating conductor can consist of, for example, copper, stainless steel, silver or also of electrically conductive plastic and is preferably used in the form of turns or a winding.
  • the sleeve according to the invention enables direct heat transfer into the end faces of the pipeline parts and by melting the web and the adjacent pipe ends, these parts are optimally welded.
  • the height of the web corresponds to the wall thickness of the pipe Line parts, ie the inner surfaces of the pipeline parts are flush with the inner surface of the web.
  • Recesses which are directed radially inwards and lead into the region of the inner wall and into the web, e.g. Holes, be arranged.
  • a bulge-free and groove-free inner surface at the connection point of the pipeline parts can be achieved by inserting a bladder into the pipeline parts in the area of the socket body and by applying compressed air to the inner surfaces of the pipeline parts and the like during the melting and welding process Web is created.
  • a sleeve 10 has a sleeve body 12 made of a thermoplastic, from the inner wall 14 of which an annular web 16 projects in the center.
  • a resistance heating wire 18 in the form of turns is embedded in the sleeve body 12 near the inner wall 14 and in the annular web 16.
  • the heating wire 18 is provided with connecting pins 20 which protrude from the sleeve body 12 and can be connected to an electrical power source for the supply of energy.
  • connecting pins 20 which protrude from the sleeve body 12 and can be connected to an electrical power source for the supply of energy.
  • radially inward in the sleeve body 12 and Holes in the melting range are arranged as melting indicators.
  • a bladder 28 made of an elastic material can be pressurized with compressed air. In the pressurized state, this rests on the inner surface of the two pipe parts 24 and the inner surface 17 of the web 16 for support. This measure prevents 16 bulges or grooves from forming in the butt region of the end faces 26 and the annular web. After solidification in the melting range, the bladder 28 is relieved of pressure and removed from the system.

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)

Abstract

A sleeve (10) has a sleeve-shaped body (12) made of thermoplastic material for joining pipes (24) made of thermoplastic material. A heat conductor (18) is embedded in the sleeve body (12), close to its inner wall (14). A ring-shaped ridge (16) projects from the inner wall (14) of the sleeve body (12), acting as a stop and additional welding point for the front faces (26) of the pipes (24) to be joined. The heat conductor (18) also extends into the ridge (16). The pipes (24) are inserted into the sleeve body (12), with their front faces (26) turned towards each other, until they are stopped by the ring-shaped ridge (16). The sleeve body (12) and the ends of the pipes (24) covered by the sleeve body (12) are partially molten and welded together by supplying energy to the heat conductor (18). Thanks to the ridge, melting is uniform and welding is reliably achieved even with large-sized and thick-walled pipes.

Description

Muffe zum Verbinden von RohrleitungsteilenSleeve for connecting pipe parts
Die Erfindung betrifft eine Muffe mit einem hülsenförmigen Muf¬ fenkörper aus Kunststoff, insbesondere thermoplastischem Mate¬ rial zum Verbinden von Rohrleitungsteilen aus thermoplastischem Kunststoff, mit einem nahe der Innenwand des Muffenkörpers im Muffenkörper eingebetteten Heizleiter, wobei jeweils zwei mit¬ einander zu verbindende Rohrleitungsteile mit gegeneinander ge¬ richteten Stirnflächen in den Muffenkörper einschiebbar und der Muffenkörper sowie die von ihm übergriffenen Enden der Rohrlei¬ tungsteile nach teilweisem Aufschmelzen durch Wärmeerzeugung im Heizleiter miteinander verschweissbar sind.The invention relates to a sleeve with a sleeve-shaped sleeve body made of plastic, in particular thermoplastic material for connecting pipe parts made of thermoplastic plastic, with a heating conductor embedded in the sleeve body near the inner wall of the sleeve body, two pipe parts to be connected to one another with each other directed end faces can be inserted into the sleeve body and the sleeve body and the ends of the pipe parts overlapped by it can be welded to one another after partial melting by heat generation in the heating conductor.
Zum Verbinden von Rohrleitungsteilen aus thermoplastischen Werkstoffen sind sogenannte Elektro-Schweissmuffen der vorste¬ hend erwähnten Art bekannt- Zum teilweisen Aufschmelzen und Verschweissen der zu verbindenden Teile ist im Bereich der In¬ nenwand des hülsenförmigen Muffenkörpers üblicherweise ein elektrischer Widerstandsheizdraht in Form einer Wicklung ange¬ ordnet, in welchem durch Zufuhr von elektrischer Energie eine dosierte, zum Verbinden der Teile ausreichende Wärmemenge er¬ zeugt wird. Insbesondere bei dickwandigen Teilen und bei grossen Dimensio¬ nen kann mit den bekannten Muffen ein gleichmässiges Aufschmel¬ zen und gesichertes Verschweissen im Bereich der Stirnseiten der zu verbindenden Rohrleitungsteile kaum erreicht werden.So-called electric welding sleeves of the type mentioned above are known for connecting pipeline parts made of thermoplastic materials , in which a metered amount of heat sufficient to connect the parts is generated by supplying electrical energy. In particular in the case of thick-walled parts and in the case of large dimensions, the known sleeves can scarcely achieve a uniform melting and secure welding in the region of the end faces of the pipeline parts to be connected.
Angesichts dieser Gegebenheiten hat sich der Erfinder die Auf¬ gabe gestellt, eine Muffe der eingangs erwähnten Art zu schaf¬ fen, mit welcher auch dickwandige Rohrleitungsteile im Bereich ihrer Stirnflächen einwandfrei verschweisst werden können.In view of these circumstances, the inventor set himself the task of creating a sleeve of the type mentioned at the beginning, with which even thick-walled pipeline parts can be welded perfectly in the area of their end faces.
Zur erfindungsgemässen Lösung der Aufgabe führt, dass von der Innenwand des Muffenkörpers ein ringförmiger Steg als Anschlag und zusätzliche Schweissstelle für die Stirnflächen der Rohr¬ leitungsteile abragt und der Heizleiter sich auch in den Steg erstreckt.In order to achieve the object according to the invention, an annular web protrudes from the inner wall of the sleeve body as a stop and an additional welding point for the end faces of the pipeline parts and the heating conductor also extends into the web.
Unter Rohrleitungsteilen werden hier alle im Rohrleitungsbau verwendeten Elemente wie Rohrstücke, Formstücke, Ventile und andere Werkstücke verstanden, die zylinderformige, durch eine Muffe verbindbare Enden aufweisen. Der Muffenkörper und die mit diesem zu verbindenden Rohrleitungsteile sind aus dem gleichen oder einem ähnlichen bzw. verwandten thermoplastischen Kunst¬ stoff gefertigt. Geeignete Werkstoffe sind u.a. PVDF, PFA, PPS, PE, PB PP,FEP,PVC,und ABS.Pipe parts are understood here to mean all elements used in pipeline construction, such as pipe pieces, fittings, valves and other workpieces, which have cylindrical ends which can be connected by a sleeve. The sleeve body and the pipeline parts to be connected to it are made of the same or a similar or related thermoplastic. Suitable materials include PVDF, PFA, PPS, PE, PB PP, FEP, PVC, and ABS.
Der Heizleiter kann als Widerstandsheizdraht aus beispielsweise Kupfer, Edelstahl, Silber oder auch aus elektrisch leitendem Kunststoff bestehen und wird bevorzugt in Form von Windungen bzw. einer Wicklung eingesetzt.As a resistance heating wire, the heating conductor can consist of, for example, copper, stainless steel, silver or also of electrically conductive plastic and is preferably used in the form of turns or a winding.
Die erfindungsgemässe Muffe ermöglicht einen direkten Wärme¬ übergang in die Stirnflächen der Rohrleitungsteile und durch Aufschmelzen des Steges sowie der angrenzenden Rohrenden ergibt sich eine optimale Verschweissung dieser Partien.The sleeve according to the invention enables direct heat transfer into the end faces of the pipeline parts and by melting the web and the adjacent pipe ends, these parts are optimally welded.
Bei einer bevorzugten Ausführungsform der erfindungsgemässen Muffe entspricht die Höhe des Steges der Wandstärke der Rohr- leitungsteile, d.h. die Innenflächen der Rohrleitungsteile fluchten mit der Innenfläche des Steges.In a preferred embodiment of the sleeve according to the invention, the height of the web corresponds to the wall thickness of the pipe Line parts, ie the inner surfaces of the pipeline parts are flush with the inner surface of the web.
Als Schmelzanzeiger können im Muffenkörper radial nach innen gerichtete, in den Bereich der Innenwand und in den Steg ge¬ führte Ausnehmungen, z.B. Bohrungen, angeordnet sein.Recesses which are directed radially inwards and lead into the region of the inner wall and into the web, e.g. Holes, be arranged.
Zum Verbinden von Rohrleitungsteilen mit einer Muffe werden je¬ weils zwei Rohrleitungsteile mit gegeneinander gerichteten Stirnflächen bis zum Anschlag mit dem ringförmigen Steg in den Muffenkörper eingeschoben und der Muffenkörper sowie die von ihm übergriffenen Enden der Rohrleitungsteile durch Energiezu¬ fuhr in den Heizleiter teilweise aufgeschmolzen und miteinander verschweisst.To connect pipeline parts to a socket, two pipeline parts with mutually facing end faces are pushed into the socket body up to the stop with the annular web, and the socket body and the ends of the pipeline parts overlapped by it are partially melted and fed together by supplying energy to the heating conductor welded.
Eine wulst- und nutfreie innere Oberfläche an der Verbindungs¬ stelle der Rohrleitungsteile kann dadurch erreicht werden, dass im Bereich des Muffenkörpers eine Blase in die Rohrleitungs¬ teile eingeschoben und während des Aufschmelz- und Verschweiss- vorgangs durch Druckluftbeaufschlagung an die Innenflächen der Rohrleitungsteile und des Steges angelegt wird.A bulge-free and groove-free inner surface at the connection point of the pipeline parts can be achieved by inserting a bladder into the pipeline parts in the area of the socket body and by applying compressed air to the inner surfaces of the pipeline parts and the like during the melting and welding process Web is created.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung erge¬ ben sich aus der nachfolgenden Beschreibung eines bevorzugten Ausführungsbeispiels sowie anhand der Zeichnung; diese zeigt in ihrer einzigen Figur schematisch einen Längsschnitt durch eine Muffe mit zwei eingeschobenen Rohrleitungsteilen.Further advantages, features and details of the invention result from the following description of a preferred exemplary embodiment and from the drawing; in its single figure, this shows schematically a longitudinal section through a sleeve with two inserted pipe parts.
Eine Muffe 10 weist einen Muffenkörper 12 aus einem thermopla¬ stische Kunststoff auf, von dessen Innenwand 14 mittig ein ringförmiger Steg 16 abragt.A sleeve 10 has a sleeve body 12 made of a thermoplastic, from the inner wall 14 of which an annular web 16 projects in the center.
Im Muffenkörper 12 ist nahe der Innenwand 14 und im ringförmi¬ gen Steg 16 ein Widerstandsheizdraht 18 in Form von Windungen eingebettet. Der Heizdraht 18 ist mit Anschlussstiften 20 ver¬ sehen, die aus dem Muffenkörper 12 herausragen und zur Energie¬ zufuhr an eine elektrische Stromquelle angeschlossen werden können. Zur visuellen Ueberprüfung des Schmelzvorganges sind im Muffenkörper 12 radial nach innen gerichtete und in den An- Schmelzbereich geführte Bohrungen als Schmelzanzeiger angeord¬ net.A resistance heating wire 18 in the form of turns is embedded in the sleeve body 12 near the inner wall 14 and in the annular web 16. The heating wire 18 is provided with connecting pins 20 which protrude from the sleeve body 12 and can be connected to an electrical power source for the supply of energy. For a visual check of the melting process, radially inward in the sleeve body 12 and Holes in the melting range are arranged as melting indicators.
Zwei miteinander zu verbindende Rohrleitungsteile 24 sind bis zum Anschlag mit dem ringförmigen Steg 16 in den Muffenkörper 12 eingeschoben. Die Höhe h des ringförmigen Steges 16 ent¬ spricht der Wandstärke d der Rohrleitungsteile 24, sodass deren Innenflächen mit der Innenfläche 17 des Steges 16 fluchten.Two pipe parts 24 to be connected to one another are pushed as far as possible with the annular web 16 into the sleeve body 12. The height h of the annular web 16 corresponds to the wall thickness d of the pipeline parts 24, so that their inner surfaces are flush with the inner surface 17 of the web 16.
Im Innern der zu verbindenden Rohrteile 24 ist im Bereich des Muffenkörpers 12 eine mit Druckluft beaufschlagbare Blase 28 aus einem elastischen Material angedeutet. Diese liegt im druckbeaufschlagten Zustand der Innenfläche der beiden Rohrlei¬ tungsteile 24 und der Innenfläche 17 des Steges 16 stützend an. Mit dieser Massnahme wird verhindert, dass sich im Stossbereich der Stirnflächen 26 und des ringförmigen Steges 16 Wulste oder Nuten ausbilden können. Nach erfolgter Erstarrung im Schmelzbe¬ reich wird die Blase 28 druckentlastet und aus dem System ent¬ fernt. In the interior of the pipe parts 24 to be connected, in the area of the socket body 12, a bladder 28 made of an elastic material can be pressurized with compressed air. In the pressurized state, this rests on the inner surface of the two pipe parts 24 and the inner surface 17 of the web 16 for support. This measure prevents 16 bulges or grooves from forming in the butt region of the end faces 26 and the annular web. After solidification in the melting range, the bladder 28 is relieved of pressure and removed from the system.

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Muffe mit einem hülsenförmigen Muffenkörper (12) aus ther¬ moplastischem .Kunststoff zum Verbinden von Rohrleitungstei¬ len (24) aus thermoplastischem Kunststoff, mit einem nahe der Innenwand (14) des Muffenkörpers (12) im Muffenkörper1. Sleeve with a sleeve-shaped sleeve body (12) made of thermoplastic. Plastic for connecting pipeline parts (24) made of thermoplastic, with a near the inner wall (14) of the sleeve body (12) in the sleeve body
(12) eingebetteten Heizleiter (18), wobei jeweils zwei mit¬ einander zu verbindende Rohrleitungsteile (24) mit gegen¬ einander gerichteten Stirnflächen (26) in den Muffenkörper (12) einschiebbar und der Muffenkörper (12) sowie die von ihm übergriffenen Enden der Rohrleitungsteile (24) nach teilweisem Aufschmelzen durch Wärmeerzeugung im Heizleiter (18) miteinander verschweissbar sind,dadurch gekennzei- chent, dass von der Innenwand (14) des Muffenkörpers (12) ein ringförmiger Steg (16) als Anschlag und zusätzliche Schweissstelle für die Stirnflächen (26) der Rohrleitungs¬ teile (24) abragt und der Heizleiter (18) sich auch in den Steg (16) erstreckt.(12) embedded heating conductor (18), two pipe parts (24) to be connected to one another with mutually directed end faces (26) being insertable into the sleeve body (12) and the sleeve body (12) and the ends of the overlapped by it Pipe parts (24) can be welded to one another after partial melting by heat generation in the heating conductor (18), characterized in that an annular web (16) as a stop and additional welding point for the end faces () of the inner wall (14) of the sleeve body (12) 26) of the pipeline parts (24) protrudes and the heating conductor (18) also extends into the web (16).
2. Muffe nach Anspruch 1, dadurch gekennzeichnet, dass die Höhe (h) des Steges (16) der Wandstärke (d) der Rohrlei¬ tungsteile (24) entspricht.2. Socket according to claim 1, characterized in that the height (h) of the web (16) corresponds to the wall thickness (d) of the pipeline parts (24).
Muffe nach Anspruch 1 dadurch gekennzeichnet, dass die Spaltfüllung durch Plastifizierung erfolgt. Socket according to claim 1, characterized in that the gap filling is carried out by plasticizing.
4. Muffe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass im Muffenkorper (12) radial nach innen gerichtete, in den Bereich der Innenwand (14) und in den Steg (16) geführte Ausnehmungen (22) als Schmelzanzeiger angeordnet sind.4. A sleeve according to claim 1 or 2, characterized in that in the sleeve body (12) radially inward, in the region of the inner wall (14) and in the web (16) guided recesses (22) are arranged as a melt indicator.
5. Muffe nach einem der Ansprüche 1 bis 3, dadurch gekenn¬ zeichnet, dass der Heizleiter (18) als elektrischer Wider¬ standsheizdraht in Form von Windungen bzw. einer Wicklung im Muffenkörper (12) angeordnet ist.5. Sleeve according to one of claims 1 to 3, characterized gekenn¬ characterized in that the heating conductor (18) is arranged as an electrical resistance heating wire in the form of turns or a winding in the sleeve body (12).
6. Verfahren zum Verbinden von Rohrleitungsteilen mit einer Muffe nach einem der Ansprüche 1 bis 4, dadurch gekenn¬ zeichnet, dass jeweils zwei Rohrleitungsteile (24) mit ge¬ geneinander gerichteten Stirnflächen (26) bis zum Anschlag mit dem ringförmigen Steg (16) in den Muffenkörper (12) eingeschoben und der Muffenkörper (12) sowie die von ihm übergriffenen Enden der Rohrleitungsteile (24) durch Ener¬ giezufuhr in den Heizleiter (18) teilweise aufgeschmolzen und miteinander verschweisst werden.6. A method for connecting pipe parts with a sleeve according to one of claims 1 to 4, characterized gekenn¬ characterized in that two pipe parts (24) with mutually directed end faces (26) up to the stop with the annular web (16) in the sleeve body (12) is pushed in and the sleeve body (12) and the ends of the pipe parts (24) overlapped by it are partially melted by supplying energy into the heating conductor (18) and welded to one another.
7. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass im Bereich des Muffenkörpers (12) eine Blase (28) in die Rohr¬ leitungsteile (24) eingeschoben und während des Aufschmelz- und Verschweissvorgangs durch Druckluftbeaufschlagung an die Innenflächen der Rohrleitungsteile (24) und an die In¬ nenflache (17) des Steges (16) angelegt wird. 7. The method according to claim 5, characterized in that in the area of the sleeve body (12) a bladder (28) in the Rohr¬ line parts (24) inserted and during the melting and welding process by pressurized air to the inner surfaces of the pipe parts (24) and is applied to the inner surface (17) of the web (16).
PCT/IB1996/001069 1995-10-12 1996-10-09 Sleeve for joining pipes WO1997013996A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2894/95951012 1995-10-12
CH289495 1995-10-12

Publications (1)

Publication Number Publication Date
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Application Number Title Priority Date Filing Date
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DE10317407B4 (en) * 2003-04-15 2016-03-17 Volkswagen Ag Method for producing a fuel tank system
DE102007042806A1 (en) * 2007-09-07 2009-03-12 Egeplast Werner Strumann Gmbh & Co. Kg Method for welding plastic pipes
ITMI20102085A1 (en) * 2010-11-10 2012-05-11 Coes Spa "ELECTRIC GASKET FOR WELDED JOINTS OF EXHAUST PIPES"
EP3434454B1 (en) 2017-07-26 2023-03-01 Georg Fischer Wavin AG Elastic electrowelding joint

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CN114466987A (en) * 2019-09-30 2022-05-10 积水化学工业株式会社 Electric melting joint
US20220341528A1 (en) * 2019-09-30 2022-10-27 Sekisui Chemical Co., Ltd. Electrofusion joint

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