FR2648077A1 - Method of joining two tubular elements made of plastic by electrofusion (electrical fusion bonding) and electrofusion coupling for implementing this method - Google Patents
Method of joining two tubular elements made of plastic by electrofusion (electrical fusion bonding) and electrofusion coupling for implementing this method Download PDFInfo
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- FR2648077A1 FR2648077A1 FR8907645A FR8907645A FR2648077A1 FR 2648077 A1 FR2648077 A1 FR 2648077A1 FR 8907645 A FR8907645 A FR 8907645A FR 8907645 A FR8907645 A FR 8907645A FR 2648077 A1 FR2648077 A1 FR 2648077A1
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- Prior art keywords
- sleeve
- electro
- welding
- connection according
- welding connection
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Classifications
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- 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
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- 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
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- 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
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- 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
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- 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
- B29C66/52298—Joining tubular articles involving the use of a socket said socket being composed by several elements
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- 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
-
- 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
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- 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
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- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Branch Pipes, Bends, And The Like (AREA)
Abstract
Description
La présente invention concerne un procédé de raccordement de deux éléments tubulaires en matière plastique, en particulier en polyéthylène, par électrosoudage et un raccord d'électro-soudage à auto-serrage pour la mise en oeuvre de ce procédé. The present invention relates to a method of connecting two tubular elements made of plastic, in particular polyethylene, by electroweld and a self-tightening electro-welding connection for the implementation of this method.
Les manchons électro-soudables sont notamment destinés à former un raccord d'éléments tubulaires en matière plastique, tels, par exemple des canalisations de distribution de gaz d'eau ou autres réalisées en général en polyéthylène. The electroweldable sleeves are in particular intended to form a connection of tubular plastic elements, such as, for example, water gas distribution pipes or the like made in general of polyethylene.
La technique d'électro-soudage consiste à chauffer une surface de contact des pièces grace à un fil chauffant noyé dans la pièce de raccordement et formant une résistance électrique, afin d'atteindre la température de soudage des matériaux. The electro-welding technique consists in heating a contact surface of the parts thanks to a heating wire embedded in the connection part and forming an electrical resistance, in order to reach the welding temperature of the materials.
La technique la plus couramment utilisée pour former de tels raccords est le surmoulage par injection. Le fil chauffant est mis en place sur ou dans une bobine laquelle est surmoulée pour former la pièce de raccordement. The most common technique used to form such fittings is injection molding. The heating wire is placed on or in a coil which is overmolded to form the connection piece.
Les manchons de ce type ont une surface intérieure cylindrique, destinée à venir en contact avec la surface à souder des éléments tubulaires. Lors de la mise en place du manchon, les extrémités des éléments tubulaires sont introduites dans le manchon puis l'electro-soudure est réalisée. The sleeves of this type have a cylindrical inner surface, intended to come into contact with the surface to be welded of the tubular elements. When the sleeve is put in place, the ends of the tubular elements are introduced into the sleeve and then the electroweld is carried out.
Il importe donc que les tubes aient leur surface externe ajustée å la surface intérieure du manchon. Il faut éviter au maximum tout jeu entre ces surfaces en contact, il y va de la qualité optimale de la soudure. Or, des problèmes de mise en place se posent souvent à la suite d'imperfections des tubes dûes aux tolérances de fabrication plus ou moins respectées, aux déformations provoquées par leur stockage (en particulier à leur ovalisation), à leur oxydation par l'air ou à leur attaque par les rayons ultra-violets... It is therefore important that the tubes have their external surface adjusted to the internal surface of the sleeve. Any play between these contacting surfaces must be avoided as much as possible, this is the optimum quality of the weld. However, installation problems often arise as a result of imperfections of the tubes due to the more or less respected manufacturing tolerances, to the deformations caused by their storage (in particular to their ovalization), to their oxidation by air. or their attack by ultraviolet rays ...
Les extrémités des tubes doivent être grattées et nettoyées afin de réaliser la meilleure soudure possible. Les parties oxydées ou attaquées nuisent en effet à la qualité de la soudure. The ends of the tubes must be scraped and cleaned in order to achieve the best possible weld. Oxidized or attacked parts indeed affect the quality of the weld.
Par ailleurs, les contraintes de fabrication des raccords sont également sévères. En effet, les normes en vigueur obligent le fabricant à observer une tolérance bien déterminée faisant l'objet d'un controle sévère. Cette tolérance est difficile à obtenir du fait de la nature du manchon réalisé en général en polyéthylène. En effet, selon le lot de matériau, les retraits sont différents, retraits difficiles à maîtriser, étant donné l'épaisseur des manchons. Furthermore, the manufacturing constraints of the fittings are also severe. Indeed, the standards in force oblige the manufacturer to observe a well-defined tolerance subject to strict control. This tolerance is difficult to obtain because of the nature of the sleeve generally made of polyethylene. Indeed, depending on the batch of material, the recesses are different, recalls difficult to control, given the thickness of the sleeves.
Le brevet européen 75 901 (VON. ROLL AG) propose un procédé de raccordement de deux canalisations isolées de toutes formes, droites ou courbées. Selon ce brevet, les extrémités des canalisations sont soudées de façon classique dépourvues de leur gaine de matière plastique et un tube de liaison de la même matière que les gaines, relie celles-ci tout en réalisant l'isolation du raccord. Pour ce faire, le tube de liaison comporte deux parties de bordure reliees par un tronçon de tube intermédiaire et qui éventuellement présentent une surface interieure conique, deux bagues de soudage de forme conique complémentaires étant intercalées entre la surface conique de la partie de bordure et la gaine de la canalisation. European patent 75 901 (VON. ROLL AG) proposes a method of connecting two insulated pipes of all shapes, straight or curved. According to this patent, the ends of the pipes are welded in a conventional manner devoid of their plastic sheath and a connecting tube of the same material as the sheaths, connects them while providing insulation of the connector. To do this, the connecting tube has two edge portions connected by an intermediate tube section and which optionally have a conical interior surface, two welding rings of complementary conical shape being interposed between the conical surface of the edge portion and the pipe sheath.
Selon ce procédé le raccordement des gaines de matière plastique est donc réalisé par l'association d'une liaison mécanique et d'une liaison d'électrosoudage. According to this process, the plastic sheaths are connected by the association of a mechanical connection and an electroweld connection.
La présente invention propose l'adaptation de ce procédé aux raccordements d'éléments tubulaires de matière plastique. The present invention proposes the adaptation of this process to the connections of tubular elements of plastic material.
Grâce au serrage, au préalable, par une liaison mécanique, les imperfections des tubes (ovalisation, courbure, défaut de moulage...) et bien évidemment celles du manchon (problème de tolérance...) n'importent plus. En effet, le diamètre de la surface cylindrique intérieure du raccord est légèrement supérieur à celui des tubes, au moment de l'emboitement de ces derniers dans une première partie intérieure du raccord. Thanks to the tightening, beforehand, by a mechanical connection, the imperfections of the tubes (ovalization, curvature, defect in molding ...) and obviously those of the sleeve (tolerance problem ...) no longer matter. Indeed, the diameter of the inner cylindrical surface of the fitting is slightly greater than that of the tubes, when the latter fit into a first inner part of the fitting.
Ensuite, cette première partie est serrée mécaniquement, ce qui entraine sa déformation et la diminution de son diamètre, qui vient correspondre à celui des tubes. Ce serrage est réalisé grâce à une seconde partie extérieure, bloquant la première partie intérieure. Une fois le raccord serré sur les tubes à relier, la première partie qui constitue l'élément de soudage est chauffée et l'electro-soudure est réalisée. Then, this first part is mechanically tightened, which causes its deformation and the reduction in its diameter, which comes to correspond to that of the tubes. This tightening is carried out thanks to a second external part, blocking the first internal part. Once the fitting is tightened on the tubes to be connected, the first part which constitutes the welding element is heated and the electro-welding is carried out.
Par cet élément de soudage, on soude donc les trois éléments du montage, à savoir le(s) tube(s), la partie intérieure et la partie extérieure.By this welding element, the three elements of the assembly are therefore welded, namely the tube (s), the internal part and the external part.
De plus, grâce au procédé conforme a l'invention, on supprime la nécessité de surmoulage telle qu'utilisée dans la plupart des raccords d'électro-soudage connus (par exemple brevet français N 2 221 679). En effet, selon l'invention, c'est la partie extérieure du raccord qui fait fonction de partie de renforcement. Ce raccord est donc de fabrication particulièrement peu coûteuse et plus simple que les raccords d'électro-soudage classiques. In addition, thanks to the process in accordance with the invention, the need for overmolding as used in most of the known electro-welding fittings (for example French patent N 2 221 679) is eliminated. Indeed, according to the invention, it is the outer part of the connector which acts as a reinforcing part. This connection is therefore particularly inexpensive to manufacture and simpler than conventional electro-welding connections.
Grâce à l'invention, le montage du raccord est relativement simple et pratique. En effet, contrairement aux raccords classiques, la mise en place des tubes dans le raccord ne se fait pas seulement par translation de ceux-ci mais également par déplacement relatif des deux parties de raccord. Ainsi, le montage nécessite un encombrement minimum. On peut même éventuellement, si besoin est, enfiler chaque partie du raccord par l'autre extrémité de chaque tube à relier, les extrémités de connexion pouvant alors rester en position fixe. Il est donc particulièrement aisé de réaliser des montages & des côtes précises. Thanks to the invention, the fitting of the connector is relatively simple and practical. Indeed, unlike conventional fittings, the establishment of the tubes in the fitting is not only done by translation thereof but also by relative displacement of the two fitting parts. Thus, the assembly requires a minimum bulk. It is even possible, if necessary, to thread each part of the connector through the other end of each tube to be connected, the connection ends then being able to remain in a fixed position. It is therefore particularly easy to carry out assemblies & precise dimensions.
Enfin, grâce à l'invention, la qualité du soudage est optimale puisque le manchon intérieur est monté serré sur les tubes et qu'il n'existe donc pas de jeu à rattraper par le matériau de soudage. Finally, thanks to the invention, the quality of the welding is optimal since the inner sleeve is mounted tight on the tubes and there is therefore no play to be made up by the welding material.
L'invention concerne donc un procédé de raccordement de deux éléments tubulaires en matière plastique, en particulier en polyéthylène, par électrosoudage et le raccord d'électro-soudage pour la mise en oeuvre de ce procédé. The invention therefore relates to a method of connecting two tubular elements made of plastic, in particular polyethylene, by electrofusion and the electro-welding connection for the implementation of this method.
Le procédé est remarquable en ce qu'un premier élément constituant l'élément de soudage est mis en place pour chevaucher l'espace entre les deux éléments tubulaires à raccorder, qu'un second élément est mis en place sur le premier élément pour venir serrer ce dit premier élément sur les éléments tubulaires, et qu'unie tension est appliquée à l'élément de soudage pour réaliser la soudure des éléments tubulaires, du premier élément et du deuxieme élément, entre eux. The method is remarkable in that a first element constituting the welding element is put in place to overlap the space between the two tubular elements to be connected, that a second element is put in place on the first element to come to clamp this said first element on the tubular elements, and that a uniform tension is applied to the welding element to achieve the welding of the tubular elements, of the first element and of the second element, between them.
Selon un mode de réalisation préféré, le second élément est mis en place par coulissement et emboltement sur le premier élément. Le blocage et le serrage peut alors être réalisé par un effet de coin, ou par toute autre coopération de forme entraidant la diminution du diamètre intérieur du premier élément. According to a preferred embodiment, the second element is put in place by sliding and embossing on the first element. Locking and tightening can then be achieved by a wedge effect, or by any other form of cooperation which helps to reduce the internal diameter of the first element.
Ce blocage peut être complété par une coopération par filetage ou analogue, le second élément étant alors mis en place par rotation sur le premier élement. This blocking can be supplemented by cooperation by threading or the like, the second element then being put in place by rotation on the first element.
Le raccord d'électro-soudage comprend donc un premier manchon intérieur constituant l'élément de soudage et un second manchon de serrage venant en prise avec le premier manchon. The electro-welding connector therefore comprises a first inner sleeve constituting the welding element and a second clamping sleeve engaging the first sleeve.
De préférence, le premier manchon intérieur à un diamètre intérieur légèrement supérieur au diamètre extérieur des tubes à raccorder. Ainsi comme il a été vu plus haut, les irrégularités ou défauts des tubes n'empêchent pas une mise en place aisée du raccord. Preferably, the first inner sleeve has an inner diameter slightly greater than the outer diameter of the tubes to be connected. Thus, as has been seen above, the irregularities or defects of the tubes do not prevent easy fitting of the fitting.
Lesdits manchons comportent des surfaces de prise et de serrage mutuels, sur la face extérieure du premier manchon et sur la face intérieure du second manchon. Said sleeves have mutual gripping and clamping surfaces on the outer face of the first sleeve and on the inner face of the second sleeve.
Cette prise et ce serrage sont de préférence réalisés par des formes conjuguées. Dans ce cas, ces surfaces peuvent être coniques. Elles peuvent également être pourvues chacune d'un filetage complémentaire, ce filetage coopérant avec la forme conique pour réaliser l'effet de coin. This grip and this tightening are preferably carried out by conjugated forms. In this case, these surfaces can be conical. They can also each be provided with a complementary thread, this thread cooperating with the conical shape to achieve the wedge effect.
L'invention est exposée ci-apres plus en détail à l'aide de dessins représentant seulement un mode d'exécution. The invention is set out below in more detail with the aid of drawings representing only one embodiment.
- la figure 1 représente en coupe longitudinale un raccord conforme à l'invention, dans une première étape de sa mise en place
- la figure 2 représente en coupe un raccord conforme à l'invention, prêt à être soudé
- la figure 3 représente en coupe une variante de conformation du manchon intérieur conforme å l'invention
- la figure 4 représente en coupe un raccord conforme à l'invention, avec un agencement particulier du fil chauffant
- la figure 5 represente en coupe un raccord conforme à l'invention, avec un premier mode d'agencement des bornes de mise en tension.- Figure 1 shows in longitudinal section a connector according to the invention, in a first step of its implementation
- Figure 2 shows in section a connector according to the invention, ready to be welded
- Figure 3 shows in section a variant of conformation of the inner sleeve according to the invention
- Figure 4 shows in section a connector according to the invention, with a particular arrangement of the heating wire
- Figure 5 shows in section a connector according to the invention, with a first mode of arrangement of the tensioning terminals.
- les figures 6 et 7 représentent, en coupe et en vue de dessus, un raccord conforme à l'invention avec un second mode d'agencement des bornes de mise en tension. - Figures 6 and 7 show, in section and in top view, a connector according to the invention with a second mode of arrangement of the tensioning terminals.
Le raccord 1 conforme à l'invention est donc constitué de deux parties coulissantes, libres, indépendantes qui s'emboitent l'une dans l'autre afin de diminuer le diamètre initial intérieur du raccord et de venir serrer les deux tubes 2 et 3 à raccorder. The connector 1 according to the invention therefore consists of two sliding parts, free, independent which fit into one another in order to reduce the initial internal diameter of the connector and to tighten the two tubes 2 and 3 to connect.
Le raccord 1 comprend donc un premier manchon intérieur 4 dans lequel est noyé le fil chauffant 5, selon un enroulement en hélice connu en soi. Il comprend également un second manchon 6 destiné à venir en prise avec le premier pour le serrer contre les tubes 2 et 3. The connector 1 therefore comprises a first inner sleeve 4 in which the heating wire 5 is embedded, according to a helical winding known per se. It also includes a second sleeve 6 intended to come into engagement with the first to clamp it against the tubes 2 and 3.
Le manchon intérieur 4 est pourvu d'un diamètre légèrement supérieur au diamètre extérieur des tubes 2 et 3. Sa mise en place, à l'emplacement de connexion, telle que représentée sur la figure 1 est donc particulièrement aisée. The inner sleeve 4 is provided with a diameter slightly greater than the outer diameter of the tubes 2 and 3. Its positioning, at the connection location, as shown in FIG. 1 is therefore particularly easy.
Selon l'exemple représenté, le manchon intérieur 4 est pourvu sur sa face extérieure d'une forme conique et le manchon extérieur 6 est pourvu sur sa face intérieure, venant en prise avec le manchon 4, d'une surface conique conjuguée. La pente de ces surfaces coniques est choisie et déterminée en fonction du diamètre des tubes et du raccord et donc de la force de serrage à exercer. According to the example shown, the inner sleeve 4 is provided on its outer face with a conical shape and the outer sleeve 6 is provided on its inner face, engaging with the sleeve 4, with a conjugate conical surface. The slope of these conical surfaces is chosen and determined as a function of the diameter of the tubes and of the fitting and therefore of the clamping force to be exerted.
Par coulissement, le manchon extérieur 6 est donc placé à force sur le manchon 4, comme il est représenté sur la figure 2. By sliding, the outer sleeve 6 is therefore placed by force on the sleeve 4, as shown in FIG. 2.
Dans cette position, le manchon extérieur 6 serre le manchon intérieur 4, grâce à l'effet de coin obtenu par leurs surfaces coniques conjuguées et le diamètre intérieur du manchon 4 est diminué ce qui entraîne un serrage mécanique des deux extrémités de tubes 2 et 3 à relier. In this position, the outer sleeve 6 tightens the inner sleeve 4, thanks to the wedge effect obtained by their conjugate conical surfaces and the inner diameter of the sleeve 4 is reduced which results in a mechanical tightening of the two ends of tubes 2 and 3 to link.
Afin d'améliorer l'effet de serrage, le manchon 4 peut être pourvu de légères entailles 7 dans le sens longitudinal du manchon 4 et de préférence coaxiales à celui-ci. Cette variante est représentée schématiquement sur la figure 3. In order to improve the tightening effect, the sleeve 4 can be provided with slight notches 7 in the longitudinal direction of the sleeve 4 and preferably coaxial with it. This variant is shown diagrammatically in FIG. 3.
Le raccord est donc alors solidement positionné et une tension peut être appliquée, de façon traditionnelle pour chauffer le fil 5 qui dégage alors assez de calories pour souder l'ensemble des éléments entre eux, à savoir les tubes 2 et 3, le manchon intérieur 4 et le manchon extérieur 6. The connector is therefore then firmly positioned and a tension can be applied, in the traditional way to heat the wire 5 which then gives off enough calories to weld all of the elements together, namely the tubes 2 and 3, the inner sleeve 4 and the outer sleeve 6.
Il peut etre également associé à ces formes coniques, des filetages prévus sur la surface extérieure du manchon intérieur 4 et sur la surface intérieure du manchon extérieur 6. Le blocage par effet de coin est alors réalisé par rotation du manchon 6 sur le manchon 4. It can also be associated with these conical shapes, threads provided on the outer surface of the inner sleeve 4 and on the inner surface of the outer sleeve 6. The blocking by wedge effect is then achieved by rotation of the sleeve 6 on the sleeve 4.
D'autres moyens de serrage, en soi connus, peuvent également être prévus pour réaliser le blocage mécanique du manchon intérieur 4 sur les deux extrémités de tubes 2 et 3 à relier, ces moyens de serrage se mettant en place par emboitement, coulissement et/ou rotation. Other clamping means, known per se, can also be provided to mechanically block the inner sleeve 4 on the two ends of tubes 2 and 3 to be connected, these clamping means being put in place by interlocking, sliding and / or rotation.
Le manchon intérieur 4 est en général réalisé en polyéthylène, dont la nature est fonction du polyéthylène à souder. Après moulage, le fil chauffant est enrobé, de façon connue en soi, dans le manchon. The inner sleeve 4 is generally made of polyethylene, the nature of which is a function of the polyethylene to be welded. After molding, the heating wire is coated, in a manner known per se, in the sleeve.
Une variante d'agencement du fil chauffant est représentée sur la figure 4. Selon ce mode de réalisation, l'enroulement de fil chauffant est double. An alternative arrangement of the heating wire is shown in FIG. 4. According to this embodiment, the heating wire winding is double.
Un fil 5.1 est mis en place à proximité de la surface intérieure du manchon 4, de façon classique, pour réaliser le soudage du manchon intérieur 4 et des tubes 2, 3. Un autre fil 5.2 est enroulé à proximité de la surface extérieure du manchon 4 et est destiné à réaliser le soudage du manchon intérieur 4 et du manchon extérieur 6. Ainsi la tension å appliquer est inférieure a celle nécessaire pour réaliser le soudage des manchons et des tubes décrits ci-dessus et représentés sur les figures 1 et 2.A wire 5.1 is put in place near the inner surface of the sleeve 4, in a conventional manner, for welding the inner sleeve 4 and the tubes 2, 3. Another wire 5.2 is wound near the outer surface of the sleeve 4 and is intended to carry out the welding of the internal sleeve 4 and the external sleeve 6. Thus the tension to be applied is lower than that necessary to carry out the welding of the sleeves and the tubes described above and represented in FIGS. 1 and 2.
Selon un autre mode de réalisation, le manchon intérieur 4 peut être dépourvu de fil chauffant et etre constitué de matière plastique conductrice. According to another embodiment, the inner sleeve 4 can be devoid of heating wire and be made of conductive plastic.
Cette matière plastique conductrice peut être une matière plastique conductrice intrinsèque, c'est-é-dire un polymère dopé d'ions (iode, sodium, mercure...) ou une matière plastique conductrice extrinsèque c'est-àdire une matière plastique chargée de poudres ou de fibres métalliques ou de noir de carbone... Dans ce cas, les problèmes de mise en place du fil chauffant sont éliminés.This conductive plastic material can be an intrinsic conductive plastic material, that is to say a polymer doped with ions (iodine, sodium, mercury, etc.) or an extrinsic conductive plastic material, that is to say a charged plastic material. powders or metallic fibers or carbon black ... In this case, the problems of placing the heating wire are eliminated.
Le manchon extérieur 6 est également de préférence réalisé en polyéthylène, par exemple thermorétractable ou en polyéthylène conducteur mais non résistif. The outer sleeve 6 is also preferably made of polyethylene, for example heat-shrinkable or of conductive but non-resistive polyethylene.
Dans ce dernier cas, le manchon 6 est pourvu de bornes 8, 9, comme il est représenté sur la figure 5. Le courant traverse alors le manchon extérieur 6 pour atteindre le manchon intérieur 4 qui réalise le soudage. In the latter case, the sleeve 6 is provided with terminals 8, 9, as shown in FIG. 5. The current then passes through the external sleeve 6 to reach the internal sleeve 4 which performs the welding.
De façon générale, les bornes de mise en tension peuvent être prévues, comme décrites ci-dessus, sur le manchon extérieur 6 ; elles peuvent également être réalisées sur les parties du manchon intérieur 4 restant libres, grâce å des découpes adéquates du manchon extérieur 6, apres mise en place du manchon extérieur 6, comme il est représenté sur les figures 6 et 7. In general, the tensioning terminals can be provided, as described above, on the outer sleeve 6; they can also be produced on the parts of the inner sleeve 4 remaining free, thanks to suitable cutouts of the outer sleeve 6, after the outer sleeve 6 has been put in place, as shown in FIGS. 6 and 7.
Ces bornes sont conformées de façon connue en soi, dans le cas d'un bobinage de fil chauffant dans le manchon intérieur 4. These terminals are shaped in a manner known per se, in the case of a coil of heating wire in the inner sleeve 4.
En résumé, le manchon intérieur 4 assure la soudure du raccord 4, 6 et des tubes 2, 3 et donc l'étanchéité du joint ; le manchon extérieur 6 assure le serrage et la tenue mécanique de l'ensemble raccord et tubes. In summary, the inner sleeve 4 ensures the welding of the connector 4, 6 and the tubes 2, 3 and therefore the seal of the joint; the outer sleeve 6 ensures the tightening and the mechanical strength of the fitting and tube assembly.
Claims (18)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8907645A FR2648077B1 (en) | 1989-06-09 | 1989-06-09 | METHOD FOR CONNECTING TWO TUBULAR ELEMENTS IN PLASTIC MATERIAL BY ELECTRO-WELDING AND ELECTRO-WELDING CONNECTION FOR CARRYING OUT SAID METHOD |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8907645A FR2648077B1 (en) | 1989-06-09 | 1989-06-09 | METHOD FOR CONNECTING TWO TUBULAR ELEMENTS IN PLASTIC MATERIAL BY ELECTRO-WELDING AND ELECTRO-WELDING CONNECTION FOR CARRYING OUT SAID METHOD |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2648077A1 true FR2648077A1 (en) | 1990-12-14 |
| FR2648077B1 FR2648077B1 (en) | 1991-10-18 |
Family
ID=9382553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR8907645A Expired - Fee Related FR2648077B1 (en) | 1989-06-09 | 1989-06-09 | METHOD FOR CONNECTING TWO TUBULAR ELEMENTS IN PLASTIC MATERIAL BY ELECTRO-WELDING AND ELECTRO-WELDING CONNECTION FOR CARRYING OUT SAID METHOD |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2648077B1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0711948A3 (en) * | 1994-10-19 | 1996-06-26 | Gruber Alois Agru Gmbh | |
| WO2008113488A2 (en) * | 2007-03-21 | 2008-09-25 | Friatec Aktiengesellschaft | Compensation element for connecting components |
| GB2494423A (en) * | 2011-09-07 | 2013-03-13 | Radius Systems Ltd | Electrofusion Fitting |
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| GB735565A (en) * | 1951-01-02 | 1955-08-24 | Miag Vertriebs Gmbh | Improvements in or relating to pipe connections in pneumatic conveying plants |
| FR1141157A (en) * | 1956-01-19 | 1957-08-27 | Method of connecting thermoplastic pipes | |
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| EP0075901A1 (en) * | 1981-09-29 | 1983-04-06 | Von Roll Ag | Process for providing a mantle tube connection across a joint between heat insulated pipes and pipe section for carrying out said process |
| DE3226575C1 (en) * | 1982-07-16 | 1984-03-01 | Friedrichsfeld Gmbh, Steinzeug- Und Kunststoffwerke, 6800 Mannheim | Device for connecting |
| FR2586036A1 (en) * | 1985-08-12 | 1987-02-13 | Kao Corp | PROCESS FOR THE PREPARATION OF AN ELECTRICALLY CONDUCTIVE POLYMER |
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| WO1987006182A1 (en) * | 1986-04-18 | 1987-10-22 | Raychem Corporation | Heat-recoverable devices |
| EP0253966B1 (en) * | 1986-06-25 | 1989-12-13 | Georg Fischer Aktiengesellschaft | Moulding of a thermoplastic material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB576573A (en) * | 1944-02-21 | 1946-04-10 | Francis Cecil Turner | Improvements in cable or conduit joints, or in connecting cables or conduits to junction boxes and the like |
| GB735565A (en) * | 1951-01-02 | 1955-08-24 | Miag Vertriebs Gmbh | Improvements in or relating to pipe connections in pneumatic conveying plants |
| FR1141157A (en) * | 1956-01-19 | 1957-08-27 | Method of connecting thermoplastic pipes | |
| DE1081288B (en) * | 1958-02-20 | 1960-05-05 | Heinrich Schulz Dipl Ing | Sleeve welding connection for plastic pipes |
| FR1207150A (en) * | 1958-08-26 | 1960-02-15 | Tube fitting | |
| NL6601024A (en) * | 1966-01-27 | 1967-07-28 | ||
| CH473663A (en) * | 1967-01-13 | 1969-06-15 | Atlantic Res Corp | Process for welding two articles of thermoplastic material capable of partially fitting one into the other by one of their ends |
| DE2239005A1 (en) * | 1972-08-08 | 1974-02-28 | Prochaska Crw Chemierohrwerk | Plastic tube end coupling piece - esp for fibreglass reinforced reaction resin tubes using conical sliding adhesive coupling parts |
| DE2628318A1 (en) * | 1976-06-24 | 1977-12-29 | Karl Heinz Vahlbrauk | Sleeve-like resilient plastic seal with heating elements - for spigot and socket joint for plastic-coated pipes |
| EP0035750A2 (en) * | 1980-03-10 | 1981-09-16 | Georg Fischer Aktiengesellschaft | Weld joint for thermoplastic pipes |
| EP0036963A1 (en) * | 1980-03-31 | 1981-10-07 | Georg Fischer Aktiengesellschaft | Welding socket for thermoplastic materials, method and apparatus for its manufacture |
| EP0075901A1 (en) * | 1981-09-29 | 1983-04-06 | Von Roll Ag | Process for providing a mantle tube connection across a joint between heat insulated pipes and pipe section for carrying out said process |
| DE3226575C1 (en) * | 1982-07-16 | 1984-03-01 | Friedrichsfeld Gmbh, Steinzeug- Und Kunststoffwerke, 6800 Mannheim | Device for connecting |
| FR2586036A1 (en) * | 1985-08-12 | 1987-02-13 | Kao Corp | PROCESS FOR THE PREPARATION OF AN ELECTRICALLY CONDUCTIVE POLYMER |
| EP0222287A1 (en) * | 1985-11-13 | 1987-05-20 | Friatec Aktiengesellschaft Keramik- und Kunststoffwerke | Electrical weldable fitting or electrical weldable bushing |
| WO1987006182A1 (en) * | 1986-04-18 | 1987-10-22 | Raychem Corporation | Heat-recoverable devices |
| EP0253966B1 (en) * | 1986-06-25 | 1989-12-13 | Georg Fischer Aktiengesellschaft | Moulding of a thermoplastic material |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0711948A3 (en) * | 1994-10-19 | 1996-06-26 | Gruber Alois Agru Gmbh | |
| WO2008113488A2 (en) * | 2007-03-21 | 2008-09-25 | Friatec Aktiengesellschaft | Compensation element for connecting components |
| WO2008113488A3 (en) * | 2007-03-21 | 2009-01-22 | Friatec Ag | Compensation element for connecting components |
| US20100101718A1 (en) * | 2007-03-21 | 2010-04-29 | Fabian Maier | Compensation element for joining components |
| US8455067B2 (en) | 2007-03-21 | 2013-06-04 | Friatec Aktiengesellschaft | Compensation element for joining components |
| GB2494423A (en) * | 2011-09-07 | 2013-03-13 | Radius Systems Ltd | Electrofusion Fitting |
| GB2494423B (en) * | 2011-09-07 | 2016-07-13 | Radius Systems Ltd | Electrofusion fitting |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2648077B1 (en) | 1991-10-18 |
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