DE29706501U1 - Welding fitting for a plastic pipe - Google Patents

Welding fitting for a plastic pipe

Info

Publication number
DE29706501U1
DE29706501U1 DE29706501U DE29706501U DE29706501U1 DE 29706501 U1 DE29706501 U1 DE 29706501U1 DE 29706501 U DE29706501 U DE 29706501U DE 29706501 U DE29706501 U DE 29706501U DE 29706501 U1 DE29706501 U1 DE 29706501U1
Authority
DE
Germany
Prior art keywords
wall
plastic
connecting body
annular space
plastic pipe
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.)
Expired - Lifetime
Application number
DE29706501U
Other languages
German (de)
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.)
Hewing GmbH
Original Assignee
Hewing GmbH
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 Hewing GmbH filed Critical Hewing GmbH
Priority to DE29706501U priority Critical patent/DE29706501U1/en
Publication of DE29706501U1 publication Critical patent/DE29706501U1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • 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"
    • B29C65/3404—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
    • B29C65/3428—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 said at least a single wire having a waveform, e.g. a sinusoidal form
    • 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
    • B29C65/3432—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 comprising several wires, e.g. in the form of several independent 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
    • B29C65/02—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"
    • B29C65/36—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" heated by induction
    • B29C65/3604—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" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/362—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" heated by induction characterised by the type of elements heated by induction which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B29C65/3628—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" heated by induction characterised by the type of elements heated by induction which remain in the joint comprising at least a single wire, e.g. in the form of a winding said at least a single wire having a waveform, e.g. a sinusoidal form
    • 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
    • B29C66/124—Tongue and groove joints
    • B29C66/1244—Tongue and groove joints characterised by the male part, i.e. the part comprising the tongue
    • B29C66/12441—Tongue and groove joints characterised by the male part, i.e. the part comprising the tongue being a single wall
    • 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
    • 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
    • B29C66/636—Internally supporting the article during joining using a support which remains in the joined object
    • 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
    • B29C66/712—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 the composition of one of the parts to be joined being different from the composition of the other part
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/0011—Moulds or cores; Details thereof or accessories therefor thin-walled moulds
    • B29C33/0016—Lost moulds, e.g. staying on the moulded object
    • 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
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/02—Thermal shrinking
    • 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
    • B29C66/70—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
    • B29C66/72—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 structure of the material of the parts to be joined
    • B29C66/723—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 structure of the material of the parts to be joined being multi-layered
    • B29C66/7232—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 structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer
    • B29C66/72321—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 structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer consisting of metals or their alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/065—HDPE, i.e. high density polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

SchweiSfittinq für ein KirnstStoffrohrWelding fitting for a cherry pipe

Die Erfindung betrifft einen Schweißfitting für ein Kunststoffrohr. Als Kunststoffrohr kommt entweder ein vollständig aus Kunststoff bestehendes Rohr oder ein Kunststoff/Metall-Verbundrohr in Frage.
5The invention relates to a welding fitting for a plastic pipe. The plastic pipe can be either a pipe made entirely of plastic or a plastic/metal composite pipe.
5

Neben der mechanischen Verbindung eines Kunststoffrohres mit einem Fitting durch Verpressen des Kunststoffrohres mit dem Fitting existieren im Stand der Technik aus Schweißfittinge, bei denen das anzuschließende EndeIn addition to the mechanical connection of a plastic pipe with a fitting by pressing the plastic pipe with the fitting, the state of the art also includes welded fittings in which the end to be connected

10 des Kunststoffrohres mit Kunststoffmaterial eines Anschlußkörpers des Schweißfittings durch Verschmelzen verschweißt, d.h. stoffschlüssig verbunden werden. Derartige auch als Schweißmuffe bekannte Schweißfittinge sind aus DE 20 15 682 Al, DE 32 26 575 Cl, DE 33 07 16210 of the plastic pipe with plastic material of a connecting body of the welding fitting by melting, i.e. they are connected in a material-locking manner. Such welding fittings, also known as welding sleeves, are made of DE 20 15 682 Al, DE 32 26 575 Cl, DE 33 07 162

15 Al, DE 94 01 411 Ul, EP 0 076 460 Bl und EP 0 115 623 Bl bekannt. Bei sämtlichen dieser bekannten Systeme besteht jedoch die Gefahr, daß die Verschweißung des Materials des Kunststoffrohres mit dem Kunststoffmaterial des Anschlußkörpers des Schweißfittings insbeson-15 Al, DE 94 01 411 Ul, EP 0 076 460 Bl and EP 0 115 623 Bl. However, with all of these known systems there is a risk that the welding of the material of the plastic pipe with the plastic material of the connecting body of the welding fitting, in particular

Telefon: (0221) 916520 · Telefax: (0221) 134297Telephone: (0221) 916520 · Fax: (0221) 134297

Telefax: (G SL) (0221) 912030Fax: (G SL) (0221) 912030

Telegramm: Dompatent KölnTelegram: Cathedral Patent Cologne

dere dann nicht ausreichend ist, wenn die dickwandige Kunststoffrohre verwendet werden.This is not sufficient when thick-walled plastic pipes are used.

Der Erfindung liegt die Aufgabe zugrunde, einen Schweißfitting für ein Kunststoffrohr zu schaffen, bei dem stets eine zuverlässige Verschweißung und Materialverbindung von Kunststoffrohr und Schweißfitting erfolgt .The invention is based on the object of creating a welding fitting for a plastic pipe, which always ensures a reliable welding and material connection between the plastic pipe and the welding fitting.

Zur Lösung dieser Aufgabe wird mit der Erfindung ein Schweißfitting für ein Kunststoffrohr vorgeschlagen, der versehen ist mit einem Anschlußkörper, mit dem ein Ende eines Kunststoffrohres verbindbar ist und der mindestens eine umlaufende Innenwand sowie mindestens eine dazu konzentrische umlaufende Außenwand aufweist, die zwischen sich einen einseitig offenen Ringraum zur Aufnahme des Endes des Kunststoffrohres bilden und die zumindest in ihren an den Ringraum angrenzenden Bereichen Kunststoff aufweisen, wobei in der mindestens einen Innenwand und in der mindestens einen Außenwand jeweils mindestens ein elektrisches Heizelement zum Erwärmen des Materials der Innen- und Außenwände in deren ringraumnahen Bereichen eingebettet ist.To solve this problem, the invention proposes a welding fitting for a plastic pipe, which is provided with a connecting body to which one end of a plastic pipe can be connected and which has at least one circumferential inner wall and at least one circumferential outer wall concentric therewith, which form an annular space open on one side between them for receiving the end of the plastic pipe and which have plastic at least in their areas adjacent to the annular space, wherein in the at least one inner wall and in the at least one outer wall at least one electrical heating element is embedded for heating the material of the inner and outer walls in the areas near the annular space.

Bei dem erfindungsgemäßen Schweißfitting weist der Anschlußkörper eine insbesondere zylindrische umlaufende Innenwand sowie eine dazu konzentrische umlaufende Außenwand auf. Der Anschlußkörper des erfindungsgemäßen Schweißfittings ist mit mindestens einem Paar derartiger Wände versehen. So weist beispielsweise ein als Verbinder ausgebildeter erfindungsgemäßer Schweißfitting zwei Paare derartiger Wände auf. Zwischen jeweils einer Innenwand und einer Außenwand befindet sich ein Ringraum, der in axialer Richtung einseitig offen ist und der Aufnahme des Endes des anzuschließenden Kunst-In the welding fitting according to the invention, the connecting body has a particularly cylindrical circumferential inner wall and a concentric circumferential outer wall. The connecting body of the welding fitting according to the invention is provided with at least one pair of such walls. For example, a welding fitting according to the invention designed as a connector has two pairs of such walls. Between each inner wall and an outer wall there is an annular space which is open on one side in the axial direction and is intended to accommodate the end of the plastic to be connected.

Stoffrohres dient. Sowohl in der Innenwand als auch in der Außenwand ist jeweils mindestens ein elektrisches Heizelement eingebettet, das bei Stromdurchfluß das Material der Wände in deren an den Ringraum angrenzenden Bereichen bis zur Plastifizierung erwärmt. Auf diese Weise wird erreicht, daß das in den Ringraum eingeführte Ende des anzuschließenden Kunststoffrohres sowohl an seiner Innenseite als auch an seiner Außenseite bis zur Plastifizierung erwärmt wird, wobei nach Erstarren eine Verschweißung des Kunststoffrohres mit dem Anschlußkörper des Schweißfittings sowohl radial auswärts als auch radial einwärts erfolgt.material pipe. At least one electric heating element is embedded in both the inner and outer walls, which, when current flows through it, heats the material of the walls in the areas adjacent to the annular space until it plasticizes. In this way, the end of the plastic pipe to be connected that is inserted into the annular space is heated both on its inside and on its outside until it plasticizes, whereby after solidification, the plastic pipe is welded to the connecting body of the welding fitting both radially outwards and radially inwards.

Bei der Erfindung kann der Anschlußkörper des Schweißfittings durch und durch aus einem thermoplastischen Kunststoff bestehen. Es ist aber auch möglich, daß der Anschlußkörper lediglich in seinen ringraumnahen Bereichen aus Kunststoff besteht. Insbesondere weist das Kunststoffmaterial des Anschlußkörpers, in das die Heizelemente eingebettet sind, einen niedrigeren Schmelzpunkt auf als der Anschlußkörper ist seinem übrigen Bereich.In the invention, the connecting body of the welding fitting can consist entirely of a thermoplastic. However, it is also possible for the connecting body to consist only of plastic in the areas close to the annular space. In particular, the plastic material of the connecting body, in which the heating elements are embedded, has a lower melting point than the connecting body in its remaining area.

Vorzugsweise weisen die Innen- und die Außenwände im wesentlichen die gleiche axiale Länge auf. Somit liegen über im wesentlichen gleiche axiale Abschnitte sowohl an der Innen- als auch an der Außenseite des Kunststoff rohres Wandungen des Anschlußkörpers an.Preferably, the inner and outer walls have essentially the same axial length. Thus, walls of the connecting body are in contact with both the inside and the outside of the plastic pipe over essentially the same axial sections.

Zweckmäßigerweise ist der Ringraum des Anschlußkörpers von einem Einsatzteil aus Kunststoff gebildet, das zwischen die Innenwand und die Außenwand eingesetzt ist und an oder in dem sich die Heizelement befinden. Die Heizelemente selbst können von dem Material des Ein-Satzteils umspritzt sein oder sind in sonstiger WeiseThe annular space of the connecting body is expediently formed by an insert made of plastic, which is inserted between the inner wall and the outer wall and on or in which the heating elements are located. The heating elements themselves can be molded from the material of the insert or can be otherwise

an bzw. in dem Einsatzteil befestigt. Gleiche Überlegungen gelten in ganz entsprechender Weise für den Fall, daß der Anschlußkörper durch und durch aus Kunststoff material besteht, in das die Heizelemente eingebettet sind. Auch hier können die Heizelemente von dem Kunststoffmaterial für den Anschlußkörper umspritzt sein.attached to or in the insert part. The same considerations apply in a similar way to the case where the connecting body is made entirely of plastic material in which the heating elements are embedded. Here too, the heating elements can be molded into the plastic material for the connecting body.

Auf der Innenseite der Innenwand weist der Anschlußkörper zweckmäßigerweise eine Verstärkung auf, die der Innenwand Stabilität verleiht, wenn das das Heizelement umgebende Material der Innenwand erhitzt wird. Dadurch wird ein Kollabieren der Innenwand verhindert.On the inside of the inner wall, the connecting body expediently has a reinforcement which gives the inner wall stability when the material of the inner wall surrounding the heating element is heated. This prevents the inner wall from collapsing.

Zweckmäßigerweise sind die Heizelemente als schlangenlinienförmig verlaufende elektrische Heizleiter ausgebildet. Dabei weisen die Heizleiter zueinander parallele Längsabschnitte auf, die untereinander durch Verbindungsabschnitte verbunden sind, wobei die Längsabschnitte parallel zur Axialerstreckung des Ringraums verlaufen. Alternativ können die Heizelemente auch als schraubenlinienförmig verlaufende Heizleiter ausgebildet sein. Schließlich ist es auch möglich, die Heizelemente als Leiterkäfige auszubilden, die mehrere in Axialerstreckung des Anschlußkörpers verlaufende Heizdrähte mit stirnseitig angeordneten Verbindungsleitern aufweisen.The heating elements are expediently designed as electrical heating conductors running in a serpentine shape. The heating conductors have longitudinal sections that are parallel to one another and are connected to one another by connecting sections, with the longitudinal sections running parallel to the axial extension of the annular space. Alternatively, the heating elements can also be designed as heating conductors running in a helical shape. Finally, it is also possible to design the heating elements as conductor cages that have several heating wires running in the axial extension of the connecting body with connecting conductors arranged on the front.

Nachfolgend wird anhand der Figuren ein Ausführungsbeispiel der Erfindung näher erläutert. Im einzelnen zeigen: An embodiment of the invention is explained in more detail below using the figures. In detail:

Fig. 1 einen Längsschnitt durch einen als VerbinderFig. 1 a longitudinal section through a connector

ausgeführten Schweißfitting und
35welded fitting and
35

Fig. 2 eine Draufsicht auf die beiden innenliegenden Heizelemente, wobei diese als Abwicklung gezeigt sind.Fig. 2 is a plan view of the two internal heating elements, shown as a developed version.

In Fig. 1 ist ein Schweißverbinder bzw. eine Schweißmuffe 10 zur Verbindung zweier Kunststoffrohre 12 im Längsschnitt dargestellt, bei denen es sich entweder um ein über die gesamte Wanddicke aus Kunststoff bestehende Rohre oder um Kunststoff/Metall-Verbundrohre handelt, bei denen eine Metallzwischenlage zwischen zwei Kunststofflagen angeordnet ist. Der Schweißfitting 10 weist einen rohrförmigen Anschlußkörper 14 aus Kunststoff auf. Der Anschlußkörper 14 ist mit einem massiven mittleren Ringabschnitt 16 versehen, von dem aus sich beidseitig in beide axiale Richtungen jeweils eine zylindrische Innenwandung 18 und eine dazu parallele und konzentrische zylindrische Außenwandung 20 erstrecken. Zwischen jeweils einer Innenwandung 18 und einer Außenwandung 20 bildet sich ein Ringraum 22, der zu jeweils einem stirnseitigen Ende 24 des Anschlußkörpers 14 hin offen ist.In Fig. 1, a welded connector or a welded sleeve 10 for connecting two plastic pipes 12 is shown in longitudinal section, which are either a pipe made of plastic over the entire wall thickness or plastic/metal composite pipes, in which a metal intermediate layer is arranged between two plastic layers. The welded fitting 10 has a tubular connecting body 14 made of plastic. The connecting body 14 is provided with a solid central ring section 16, from which a cylindrical inner wall 18 and a parallel and concentric cylindrical outer wall 20 extend on both sides in both axial directions. Between each inner wall 18 and an outer wall 20, an annular space 22 is formed, which is open towards a front end 24 of the connecting body 14.

In den an die Ringräume 22 angrenzenden Bereichen der Wandungen 18 und 20 sind in das Kunststoff material des Anschlußkörpers 14 Heizelemente 26,28 eingebettet. Die Heizelemente 26,28 sind vorzugsweise jeweils als schlangenlinienförmig verlaufende Heizbänder bzw. Heizdrähte 30 ausgebildet, deren Anschlußenden 32 durch den Anschlußkörper 14 hindurch radial nach außen geführt sind. Die Heizbänder 3 0 der in die Innenwandungen 18 eingebetteten Heizelemente 26 sind abgewickelt in Fig. 2 dargestellt. Diese Heizbänder 30 weisen axial verlaufende Längsabschnitte 34 auf, die über in Umfangsrichtung verlaufende Verbindungsabschnitte 36 verbunden sind.In the areas of the walls 18 and 20 adjacent to the annular spaces 22, heating elements 26, 28 are embedded in the plastic material of the connecting body 14. The heating elements 26, 28 are preferably each designed as serpentine heating bands or heating wires 30, the connecting ends 32 of which are guided radially outwards through the connecting body 14. The heating bands 30 of the heating elements 26 embedded in the inner walls 18 are shown unrolled in Fig. 2. These heating bands 30 have axially extending longitudinal sections 34, which are connected via connecting sections 36 running in the circumferential direction.

Wie in Fig. 1 dargestellt, sind in die Ringräume 32 die Enden der Kunststoffrohre 12 eingeführt. Durch Anlegung einer elektrischen Spannung an die Anschlußenden 32 der Heizbänder 30 der Heizelemente 26 und 28 fließt durch die Heizbänder 30 elektrischer Strom, der zu einer Erhitzung des thermoplastischen Kunststoffmaterials des Anschlußkörpers 14 im ringraumnahen Bereich führt. Darüber hinaus erwärmen die Heizbänder 30 auch die von den Ringräumen 22 aufgenommenen Enden der Kunststoffrohre 12 von innen und von außen. Infolge der Plastifizierung des Materials des Anschlußkörpers 14 und des Kunststoffrohres 12 kommt es zu einer innigen Verbindung dieser beiden Elemente, so daß nach Abkühlung eine zuverlässige Schweißverbindung des Anschlußkörpers 14 mit den Kunststoffrohren 12 entsteht. In die Innenwände 18 des Anschlußkörpers 14 ist eine Verstärkungseinlage 38 integriert, die insbesondere als durchgehende Hülse aus Metall, einem Duroplast oder einem Kunststoff-Material mit einem Schmelzpunkt, der wesentlich höher ist als der des durch die Heizelemente plastifizierbaren Kunststoffmaterials, ausgebildet ist. Hierdurch wird verhindert, daß die den Durchlaß 40 des Anschlußkörpers 14 begrenzende Innenwand 18 im erhitzten Zustand zusammenfällt. Die Verstärkungseinlage 38 ist im durchlaßnahen Bereich der Innenwand 18 in dessen Material eingebettet .As shown in Fig. 1, the ends of the plastic pipes 12 are inserted into the annular spaces 32. By applying an electrical voltage to the connection ends 32 of the heating bands 30 of the heating elements 26 and 28, an electrical current flows through the heating bands 30, which leads to heating of the thermoplastic material of the connecting body 14 in the area close to the annular space. In addition, the heating bands 30 also heat the ends of the plastic pipes 12 received in the annular spaces 22 from the inside and the outside. As a result of the plasticization of the material of the connecting body 14 and the plastic pipe 12, an intimate connection of these two elements occurs, so that after cooling, a reliable welded connection of the connecting body 14 with the plastic pipes 12 is created. A reinforcing insert 38 is integrated into the inner walls 18 of the connecting body 14, which is designed in particular as a continuous sleeve made of metal, a thermosetting plastic or a plastic material with a melting point that is significantly higher than that of the plastic material that can be plasticized by the heating elements. This prevents the inner wall 18 delimiting the passage 40 of the connecting body 14 from collapsing when heated. The reinforcing insert 38 is embedded in the material of the inner wall 18 in the area near the passage.

Claims (6)

ANSPRUCHEEXPECTATIONS 1. Schweißfitting für ein Kunststoffrohr, mit1. Welding fitting for a plastic pipe, with einem Anschlußkörper (14) , mit dem ein Ende eines Kunststoffrohres (12) verbindbar ist und der mindestens eine umlaufende Innenwand (18) sowie mindestens eine dazu konzentrische umlaufende Außenwand (20) aufweist, die zwischen sich einen einseitig offenen Ringraum (22) zur Aufnahme des Endes des Kunststoffrohres (12) bilden und die zumindest in ihren an den Ringraum (22) angrenzenden Bereichen Kunststoff aufweisen,a connecting body (14) to which one end of a plastic pipe (12) can be connected and which has at least one circumferential inner wall (18) and at least one circumferential outer wall (20) concentric therewith, which form an annular space (22) open on one side between them for receiving the end of the plastic pipe (12) and which have plastic at least in their areas adjacent to the annular space (22), wobei in der mindestens einen Innenwand (18) und in der mindestens einen Außenwand (20) jeweils mindestens ein elektrisches Heizelement (26,28) zum Erwärmen des Materials der Innen- und Außenwände (18,20) in deren ringraumnahen Bereichen eingebettet ist.wherein in the at least one inner wall (18) and in the at least one outer wall (20) at least one electrical heating element (26, 28) is embedded for heating the material of the inner and outer walls (18, 20) in their regions close to the annular space. 2. Schweißfitting nach Anspruch 1, dadurch gekennzeichnet, daß die mindestens eine Innenwand (18) und die mindestens eine Außenwand (20) im wesentlichen die gleiche axiale Länge aufweisen.2. Welded fitting according to claim 1, characterized in that the at least one inner wall (18) and the at least one outer wall (20) have substantially the same axial length. 3. Schweißfitting nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Ringraum (22) von einem Einsatzteil aus Kunststoff gebildet ist, das zwischen der Innenwand (18) und der Außenwand (20) angeordnet ist und an oder in dem sich die die Heizelemente (26,28) befinden.3. Welded fitting according to claim 1 or 2, characterized in that the annular space (22) is formed by an insert made of plastic, which is arranged between the inner wall (18) and the outer wall (20) and on or in which the heating elements (26, 28) are located. 4. Schweißfitting nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Kunststoffmaterial4. Welding fitting according to one of claims 1 to 3, characterized in that the plastic material des Anschlußkörpers (14) , in den die Heizelemente (26,28) eingebettet sind, einen niedrigeren Schmelzpunkt aufweist als das oder die Material/ Materialien, aus dem/denen der übrige Teil des Anschlußkörpers (14) besteht.of the connecting body (14) in which the heating elements (26, 28) are embedded, has a lower melting point than the material(s) from which the remaining part of the connecting body (14) consists. 5. Schweißfitting nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Anschlußkörper (14) im Bereich seiner mindestens einen Innenwand (18) eine Verstärkung (38) aufweist, die insbesondere als gelochte oder ungelochte Metallhülse ausgebildet ist und/oder ein Duroplast aufweist.5. Welded fitting according to one of claims 1 to 4, characterized in that the connecting body (14) in the region of its at least one inner wall (18) has a reinforcement (38) which is designed in particular as a perforated or unperforated metal sleeve and/or has a thermosetting plastic. 6. Schweißf itting nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Heizelemente (26, 28) als schlangenlinienformig oder schraubenförmig verlaufende elektrische Heizleiter (30) ausgebildet sind.6. Welding fitting according to one of claims 1 to 5, characterized in that the heating elements (26, 28) are designed as serpentine or helical electrical heating conductors (30).
DE29706501U 1997-04-11 1997-04-11 Welding fitting for a plastic pipe Expired - Lifetime DE29706501U1 (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2425337A (en) * 2005-04-22 2006-10-25 Uponor Innovation Ab Electrofusion fitting to seal barrier layer of composite pipe
WO2015132783A3 (en) * 2014-03-04 2015-10-29 Huliot A.C.S. Ltd Electromagnetic induction welding of fluid distribution systems
US9528638B2 (en) 2011-04-07 2016-12-27 Huliot A.C.S. Ltd. Electromagnetic induction welding of plastic pipe distribution systems
US10710312B2 (en) 2017-03-13 2020-07-14 Huliot Agricultural Cooperative Society Ltd Induction weldable pipe connector having thermally insulated induction weldable socket mouth rims
US11543064B2 (en) * 2017-10-31 2023-01-03 Trelleborg Sealing Solutions Germany Gmbh Continuous fiber reinforced composite and metal electrofusion coupler
CN115711332A (en) * 2022-12-05 2023-02-24 广东东方管业有限公司 Connecting structure and connecting method for steel wire mesh winding polyethylene composite pipe

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2425337A (en) * 2005-04-22 2006-10-25 Uponor Innovation Ab Electrofusion fitting to seal barrier layer of composite pipe
US9528638B2 (en) 2011-04-07 2016-12-27 Huliot A.C.S. Ltd. Electromagnetic induction welding of plastic pipe distribution systems
WO2015132783A3 (en) * 2014-03-04 2015-10-29 Huliot A.C.S. Ltd Electromagnetic induction welding of fluid distribution systems
CN106068417A (en) * 2014-03-04 2016-11-02 霍里奥特公司 The electromagnetic induction welding of fluid distributing system
US10828840B2 (en) 2014-03-04 2020-11-10 Huliot A.C.S. Ltd Electromagnetic induction welding of fluid distribution systems
US10710312B2 (en) 2017-03-13 2020-07-14 Huliot Agricultural Cooperative Society Ltd Induction weldable pipe connector having thermally insulated induction weldable socket mouth rims
US11543064B2 (en) * 2017-10-31 2023-01-03 Trelleborg Sealing Solutions Germany Gmbh Continuous fiber reinforced composite and metal electrofusion coupler
CN115711332A (en) * 2022-12-05 2023-02-24 广东东方管业有限公司 Connecting structure and connecting method for steel wire mesh winding polyethylene composite pipe
CN115711332B (en) * 2022-12-05 2023-05-16 广东东方管业有限公司 Connection structure and connection method for steel wire mesh wound polyethylene composite pipe

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