WO2011023888A1 - Assembly for connecting together a metal tubular element and a tubular element made of a synthetic material - Google Patents

Assembly for connecting together a metal tubular element and a tubular element made of a synthetic material Download PDF

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Publication number
WO2011023888A1
WO2011023888A1 PCT/FR2010/051733 FR2010051733W WO2011023888A1 WO 2011023888 A1 WO2011023888 A1 WO 2011023888A1 FR 2010051733 W FR2010051733 W FR 2010051733W WO 2011023888 A1 WO2011023888 A1 WO 2011023888A1
Authority
WO
WIPO (PCT)
Prior art keywords
tubular element
end portion
rigid ring
connection assembly
assembly according
Prior art date
Application number
PCT/FR2010/051733
Other languages
French (fr)
Inventor
Peter Faulstroh
Marc Novellani
Original Assignee
Mgi Coutier
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 Mgi Coutier filed Critical Mgi Coutier
Priority to CN201080003189.XA priority Critical patent/CN102216664B/en
Publication of WO2011023888A1 publication Critical patent/WO2011023888A1/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
    • F16L47/20—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics based principally on specific properties of plastics
    • F16L47/24—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics based principally on specific properties of plastics for joints between metal and plastics pipes
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • F16J15/104—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by structure
    • 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
    • F16L33/00—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses
    • F16L33/18—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses characterised by the use of additional sealing means
    • 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
    • F16L33/00—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses
    • F16L33/30—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses comprising parts inside the hoses only
    • 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
    • F16L37/00—Couplings of the quick-acting type
    • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
    • F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
    • F16L37/098—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of flexible hooks
    • F16L37/0985—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of flexible hooks the flexible hook extending radially inwardly from an outer part and engaging a bead, recess or the like on an inner part

Definitions

  • connection assembly is more particularly used for the connection of tubular elements belonging to a fluid circulation circuit, including fuel circulation.
  • connection between a metal tube and a thermoplastic tube is made by means of bulges made on the metal tube.
  • the thermoplastic tube is then simply force-fitted onto the metal tube and the contact between these bulges of the metal tube and the inner wall of the thermoplastic tube seals the connection.
  • this connection may to prove insufficiently robust.
  • US 5,779,286 which discloses a sealing device for connection between a tubular metal member and a polymeric tubular member, the sealing device having an O-ring mounted on an end portion of the tubular metal member such that it bears against a bead formed on the outer surface of the end portion, and a retaining ring mounted on an end portion of the metal tubular element so that the O-ring is sandwiched between the ring holding and the bead.
  • Such a sealing device requires great precision firstly in the production of the end portion of the metal tubular element, and secondly in the positioning of the O-ring relative to the bead.
  • the O-ring is separated from the retaining ring, it is not excluded to forget to position the O-ring on the end portion of the metal tubular member. In addition, if the axial clearance between the retaining ring and the O-ring is too great, the latter is likely to move, and therefore not to ensure a satisfactory seal.
  • the holding of the retaining ring mounted on the end portion of the metal tube is limited and makes it difficult to manipulate the metal tube provided with its sealing device as a semi-finished product, the assembly of the thermoplastic tube being in the wake of mounting the O-ring and the retaining ring.
  • the present invention aims to remedy all or part of these disadvantages.
  • connection assembly comprising a sealing device which is simple and economical structure, while ensuring a satisfactory seal between the elements to be connected.
  • connection assembly comprising:
  • sealing device fitted on the end portion of the first tubular element so that it bears against the abutment means, the sealing device comprising a rigid ring mounted on the end portion of the first element; tubular, and first and second elastic sealing means integral with the rigid ring, the first sealing means projecting from the outer surface of the rigid ring and cooperating with the inner surface of the second tubular element and the second means of sealing protruding from the inner surface of the ring rigid and cooperating with the outer surface of the end portion of the first tubular member.
  • first and second sealing means are integral with the rigid ring, the latter are not likely to move relative to the ring and the risk of extraction or mispositioning of seals during assembly are thus greatly reduced. It is also no longer possible to forget to position the sealing means on the metal tubular element and a single assembly operation is sufficient to position the sealing ring contrary to certain concepts, such as that described in the US document. 5,779,286 requiring two assembly operations, one for the seal, one for the retaining ring. In addition, a perfect positioning of the ring relative to the metal tubular element ensures a perfect positioning of the sealing means.
  • the sealing device according to the invention makes it possible to ensure a satisfactory seal between the tubular elements to be connected.
  • the sealing device according to the invention makes it possible to produce the metal tubular element with less precise manufacturing tolerances. Indeed, by adequate dimensionality of the first and second sealing means, it is possible to absorb greater tolerances than a direct seal metal tube / synthetic tube. Similarly, the first and second sealing means make it possible to compensate for certain surface defects of the (external) and synthetic (internal) metal tubes. The first and second sealing means make it possible in particular to avoid degrading the connection because of certain changes in the properties of the synthetic tube in aging (creep, thermo-oxidation, swelling, etc.).
  • the ring is preferably injected, which allows to obtain dimensional tolerances closer than what is possible to obtain on the shaped end of the metal tube.
  • the first and / or second sealing means comprise at least one annular seal overmolded on the rigid ring.
  • the rigid ring comprises at least one annular groove in which is molded an annular seal.
  • the seals on the rigid ring allows greater latitude in the geometry of the seals compared to existing seals using conventional O-rings.
  • the seals can have larger contact surfaces with the tubes than an O-ring, thus optimizing the sealing and permeability performance.
  • the present invention makes it possible to have a greater latitude on the dimensional tolerances of the tubes to be connected (external diameter of the metal tube and internal diameter of the thermoplastic tube) than other concepts, such as that described in US 5,779,286 requiring relatively tight dimensional tolerances.
  • the sealing device according to the present invention in particular supports defects in surface conditions, in particular on the metal tube, for example related to its covering, to the end deformation operation, to a weld line, etc. .
  • the internal diameter of the seal projecting from the inner surface of the ring is preferably smaller than the outer diameter of the end portion of the metal tube of to ensure sufficient interference and to achieve the compression ratio of the seal ensuring optimum efficiency.
  • the first and second sealing means are offset axially. These provisions make it possible to limit the overhang of the rigid ring and to stabilize the ring as much as possible during the force-fitting of the second thermoplastic tube.
  • the gasket projecting from the inner surface of the ring is advantageously positioned at the rear of the ring, that is to say on the opposite side to the free end of the end portion of the metal tube.
  • the first and second sealing means are made of different materials. These provisions make it possible to optimize the tightness of the connection.
  • the first sealing means comprise two annular seals overmolded on the ring and axially offset
  • the second sealing means comprise two annuli ann on or on the bag. and displaced axially.
  • the four annular seals are overmolded on the ring in a single operation and possibly linked together.
  • each annular seal belonging to the first sealing means is disposed substantially in the same plane as one of the annular seals belonging to the second sealing means. Combinations of different materials for the different joints are then possible to optimize the sealing and permeability of the connection.
  • first row of internal and external seals (situated axially on the side of the synthetic tubular element) in a material optimized for contact with the fluid and a second row of internal and external seals ( located axially on the side of the metal tubular element) in a material optimized for sealing with the ambient air.
  • the second sealing means have an interference with the metal tubular element sufficient for their compression to ensure excellent sealing and permeability.
  • the sealing ring is thus mounted slightly tight on the metal tubular element, thanks to both the compression of the second sealing means and the ring stiffness.
  • the rigid ring has at least one through orifice, and the first and second sealing means are interconnected through the at least one through orifice.
  • Such a connection between the first and second sealing means reinforces the mechanical strength of the first and second sealing means on the rigid ring, and contributes in particular to the resistance of the first and second sealing means during assembly operations of the device sealing on the first tubular element, and the second tubular element on the first tubular element equipped with the sealing device.
  • the rigid ring comprises first hooking means of the ring on the end portion of the first tubular element.
  • the first hooking means comprise at least one elastically deformable member arranged to cooperate with a projecting element formed on the outer surface of the end portion of the first tubular element so as to ensure that the rigid ring is hooked onto the end portion.
  • the elastically deformable member is an elastically deformable tongue.
  • each elastically deformable tongue is provided, at its free end, with a hook portion arranged to cooperate with the projecting element formed on the outer surface of the end portion of the first tubular element.
  • the rigid ring comprises second attachment means of the ring on the second tubular element.
  • the second attachment means comprise at least one projecting element formed on the outer surface of the rigid ring.
  • the projecting element contributes to the holding of the synthetic tubular element on the rigid ring, as well as to the seal between the ring and the synthetic tubular element
  • the end of the rigid ring turned towards the free end of the end portion of the first tubular element is delimited externally by a substantially frustoconical surface.
  • the rigid bag is preferably made of synthetic material, and advantageously of thermoplastic material.
  • the first and second sealing means are preferably made of elastomer, and advantageously an elastomer adapted to allow a chemical grip with the rigid ring. Such a grip makes it possible to reinforce the physical strength of the seal and the tightness of the assembly.
  • the abutment means comprise a bead, preferably annular, extending radially outwardly from the outer surface of the end portion of the first tubular element.
  • This bead can in certain configurations help to retain the tubular element made of synthetic material mounted in force and can even constitute an additional sealing surface. It can also be used, in other configurations, retaining for the first hooking means of the ring.
  • the abutment means are constituted by the free end of the end portion of the metal tubular element.
  • the free end of the end portion of the first tubular element is delimited externally by a substantially frustoconical surface.
  • the end of the rigid ring turned towards the free end of the end portion of the first tubular element has an outer diameter smaller than the internal diameter of the second tubular element.
  • the rigid ring bears against the abutment means.
  • the first sealing means comprise an annular rib and an annular groove, the annular rib being arranged to cooperate with the inner surface of the second tubular element and to deform at least in part in the annular groove, in the fitted position of the first and second tubular elements.
  • the annular groove is preferably further from the end of the rigid ring turned towards the free end of the end portion of the first tubular element that the annular rib.
  • the second tubular element is made of plastic material, and preferably of thermoplastic material.
  • the ring mounted in force on the metallic tubular element, the synthetic tubular element being itself mounted in force on the ring, the sealing means projecting from its outer surface, as well as any rigid bulges ensuring the restraint. of the synthetic tubular element on the ring
  • the synthetic tubular element mounted in force coming to conform to the shape of this bead and thus no longer being able to separate from the metal tubular element.
  • the second tubular element is elastically deformable.
  • Figure 1 is a longitudinal sectional view of a connection assembly according to the invention.
  • Figure 2 is an enlarged view of a detail of Figure 1.
  • Figure 3 is a side view of the rigid ring of the sealing device shown in Figure 1.
  • Figure 4 is a longitudinal sectional view of a connection assembly according to a second embodiment.
  • Figure 5 and 6 are longitudinal sectional views of a connection assembly according to third and fourth embodiments.
  • Figure 7 is a partial longitudinal sectional view of a connection assembly according to a sixth embodiment.
  • Figure 8 is a longitudinal sectional view of a sealing device belonging to a connection assembly according to a seventh embodiment.
  • FIG. 1 represents a connection assembly 2 comprising:
  • a metal tubular element 3 having an end portion 4 comprising an annular bead 5 extending radially outwards from the outer surface thereof;
  • the sealing device 7 comprises a rigid ring 8 intended to be fitted on the end portion 4 of the metal tubular element 3 so that it bears against the annular bead 5.
  • the rigid ring 8 is made of preferably of synthetic material.
  • the end 9 of the rigid ring 8 intended to be turned towards the free end of the end portion 4 is delimited externally by a surface substantially frustoconical ensuring a progressive widening of the polymeric tubular element 6, its centering, a homogeneous distribution of the fitting forces.
  • the end 9 of the rigid ring 8 has an outer diameter smaller than the internal diameter of the polymeric tubular element 6.
  • the outer diameter of the rigid ring 8 then increases along the cone portion to reach a diameter advantageously greater than the internal diameter of the polymeric tubular element 6.
  • the rigid ring 8 has a first annular groove 11 formed on its outer surface and a second annular groove 12 formed on its inner surface.
  • the rigid ring 8 further comprises at least two openings 13 opening respectively into the bottom of the first and second annular grooves 11, 12.
  • the sealing device 7 also comprises a first annular seal 14 overmolded in the first groove 11 and a second annular seal 15 overmolded in the second groove 12.
  • the first and second annular joints 14, 15 extend substantially coplanarly.
  • the first and second annular seals 14, 15 are, according to this embodiment variant, made of an identical material.
  • the first annular seal 14 protrudes radially from the outer surface of the rigid ring 8 and is arranged to seal with the inner surface of the polymeric tubular element 6, while the second annular seal 15 projects radially from the surface.
  • inner of the rigid ring and is arranged to seal with the outer surface of the end portion 4 of the metal tubular element 3.
  • the outer diameter of the annular seal 14 is greater than the internal diameter of the polymeric tubular member 6 so that interference optimizing the compression of the seal 14 is carried out after mounting of the polymeric tubular element 6.
  • the inner diameter of the annular seal 15 is smaller than the outer diameter of the end portion 4 of the tubular metal element 3 so that an interference optimizing the compression of the seal 15 is made after the mounting of the ring.
  • the free end of the end portion 4 of the metal tubular element 6 is delimited externally by a substantially frustoconical surface so as to facilitate the mounting of the rigid ring 8 on the end portion 4, to ensure a homogeneous distribution of the forces of fitting and a progressive compression of the annular seal 15 during assembly of the ring on the end portion 4.
  • first and second annular seals 14, 15 could be made of different materials.
  • Figure 4 shows an alternative embodiment of the connecting element which differs from that shown in Figures 1 and 2 in that the annular seals 14, 15 are offset axially to increase the stability of the ring.
  • FIGS. 5 and 6 show two embodiments of the connection element which differ from that shown in FIGS. 1 and 2 in that the sealing device 7 comprises first attachment means for the rigid ring 8 on the end portion 4 of the metal tubular element 3, and second hooking means of the rigid ring on the polymeric tubular element 6.
  • the first attachment means comprise a plurality of elastically deformable tongues 21 extending axially from the end of the rigid ring 8 turned towards the annular bead 5.
  • Each elastically deformable tongue 21 is provided at its free end with a hook portion 22 arranged to cooperate with the annular bead 5 formed on the end portion 4 of the metal tubular element 3.
  • the second hooking means comprise an annular bead 23 formed on the outer surface of the rigid ring 8, the annular bead 23 contributing to the holding of the polymeric tubular element 6 on the ring, and to the seal between the ring and the polymeric tubular element.
  • the method of assembling the sealing device 7 on the tubular elements 3, 6 consists in introducing the rigid ring 8 into the polymeric tubular element 6 until the annular bead 23 is crossed, and then to press the rigid ring 8 on the end portion 4 of the metal tubular element 3 until the hook portion 22 of each resiliently deformable tongue 21 cooperates with the annular bead 5.
  • This configuration of the sealing device 7 may allow delivery, for example of a synthetic tube equipped with the rigid ring 6, then mounted on a pipe or a metal tip, for example on a vehicle.
  • the method of assembling the sealing device 7 on the tubular elements 3, 6 consists in inserting the rigid ring 8 on the end portion 4 until the hook portion 22 of each elastically deformable tongue 21 cooperates with the annular bead 5, and then to force the polymeric tubular element 6 on the metal tubular element 3 provided with the rigid ring 8 until the hook portions 22 are crossed.
  • the polymeric tubular element 6 thus covering the hook portions 22 further increases the grip of the latter on the bead 5 and increases the tear resistance between the polymeric tubular element 6, the rigid ring 8 and the tubular element metallic.
  • Such an assembly method has the disadvantage of preventing a prior assembly of the ring 8 on the polymeric tubular element 6 before mounting on the metal tubular element 3.
  • FIG. 7 represents an alternative embodiment of the connecting element which differs from that shown in FIGS. 1 and 2 in that the end 9 of the rigid ring 8 bears against the free end of the end portion. 4 of the metal tubular element 3 and not against the annular bead 5.
  • FIG. 8 shows an alternative embodiment of the connecting element 2 which differs from that shown in FIGS. 1 and 2 essentially in that the first annular seal 14 comprises an annular rib 24 and an annular groove 25 farther away from the end 9 of the rigid ring 8 that the annular rib 24, the annular rib 24 being arranged to cooperate with the inner surface of the tubular member 6 and to deform at least partially in the annular groove 25, in the fitted position of the two tubular elements 3, 6.

Abstract

The invention relates to an assembly for connecting together a metal tubular element and a tubular element made of a synthetic material. The connection assembly (2) comprises a first metal tubular element (3) having an end portion (4) comprising abutment means (5), a second tubular element (6) made of a synthetic material and fitted around the end portion of the first tubular element, and a sealing device (7) fitted over the end portion (4) of the first tubular element so as to bear against the abutment means, the sealing device comprising a rigid ring (8), and first and second resilient sealing means (14, 15) rigidly connected to the rigid ring, the first sealing means (14) projecting from the outer surface of the rigid ring and engaging with the inner surface of the second tubular element (6), and the second sealing means (15) projecting from the inner surface of the rigid ring and engaging with the outer surface of the end portion (4) of the first tubular element (3).

Description

Ensemble de raccordement entre un élément tubulaire métallique et un élément tubulaire réalisé en matière synthétique  Connection assembly between a tubular metal element and a tubular element made of synthetic material
La présente invention concerne un ensemble de raccordement. Un tel ensemble de raccordement est plus particulièrement utilisé pour le raccordement d'éléments tubulaires appartenant à un circuit de circulation de fluide, et notamment de circulation de carburant. The present invention relates to a connection assembly. Such a connection assembly is more particularly used for the connection of tubular elements belonging to a fluid circulation circuit, including fuel circulation.
De manière usuelle, le raccordement entre un tube métallique et un tube thermoplastique est réalisé par le biais de renflements réalisés sur le tube métallique. Le tube thermoplastique est alors simplement emmanché en force sur le tube métallique et le contact entre ces renflements du tube métallique et la paroi interne du tube thermoplastique assure l'étanchéité de la liaison.  Usually, the connection between a metal tube and a thermoplastic tube is made by means of bulges made on the metal tube. The thermoplastic tube is then simply force-fitted onto the metal tube and the contact between these bulges of the metal tube and the inner wall of the thermoplastic tube seals the connection.
Néanmoins, dans certains cas, en fonction du niveau de sévérité des normes environnementales en vigueur, de la volatilité/agressivité du carburant utilisé, des contraintes subies au niveau de la liaison et de la matière utilisée pour le tube thermoplastique, cette liaison peut s'avérer insuffisamment robuste.  Nevertheless, in certain cases, depending on the level of severity of the environmental standards in force, the volatility / aggressiveness of the fuel used, the stresses on the link and the material used for the thermoplastic tube, this connection may to prove insufficiently robust.
Dans ce cas, des designs ayant recours à des joints d'étanchéité spécifiques sont utilisés.  In this case, designs using specific gaskets are used.
Un exemple de ces designs est présenté dans le document An example of these designs is presented in the document
US 5 779 286 qui divulgue un dispositif d'étanchéité pour le raccordement entre un élément tubulaire métallique et un élément tubulaire polymérique, le dispositif d'étanchéité comportant un joint torique monté sur une portion d'extrémité de l'élément tubulaire métallique de telle sorte qu'il prenne appui contre un bourrelet ménagé sur la surface extérieure de la portion d'extrémité, et une bague de maintien montée sur une portion d'extrémité de l'élément tubulaire métallique de telle sorte que le joint torique soit enserré entre la bague de maintien et le bourrelet. US 5,779,286 which discloses a sealing device for connection between a tubular metal member and a polymeric tubular member, the sealing device having an O-ring mounted on an end portion of the tubular metal member such that it bears against a bead formed on the outer surface of the end portion, and a retaining ring mounted on an end portion of the metal tubular element so that the O-ring is sandwiched between the ring holding and the bead.
Un tel dispositif d'étanchéité nécessite une grande précision d'une part dans la réalisation de la portion d'extrémité de l'élément tubulaire métallique, et d'autre part dans le positionnement du joint torique par rapport au bourrelet.  Such a sealing device requires great precision firstly in the production of the end portion of the metal tubular element, and secondly in the positioning of the O-ring relative to the bead.
En outre, du fait que le joint torique est séparé de la bague de maintien, il n'est pas exclu d'oublier de positionner le joint torique sur la portion d'extrémité de l'élément tubulaire métallique. De plus, si le jeu axial entre la bague de maintien et le joint torique est trop important, ce dernier est susceptible de se déplacer, et donc de ne pas assurer une étanchéité satisfaisante. In addition, because the O-ring is separated from the retaining ring, it is not excluded to forget to position the O-ring on the end portion of the metal tubular member. In addition, if the axial clearance between the retaining ring and the O-ring is too great, the latter is likely to move, and therefore not to ensure a satisfactory seal.
Le dispositif d'étanchéité décrit dans le document US 5 779 286 n'autorise l'utilisation que d'un seul joint, d'une seule matière, ce qui peut être insuffisant dans certains cas.  The sealing device described in US 5,779,286 authorizes the use of only one seal, a single material, which may be insufficient in some cases.
De plus, la tenue de la bague de maintien montée sur la portion d'extrémité du tube métallique est limitée et rend difficile la manipulation du tube métallique muni de son dispositif d'étanchéité en tant que produit semi- fini, le montage du tube thermoplastique se faisant dans la foulée du montage du joint torique et de la bague de maintien.  In addition, the holding of the retaining ring mounted on the end portion of the metal tube is limited and makes it difficult to manipulate the metal tube provided with its sealing device as a semi-finished product, the assembly of the thermoplastic tube being in the wake of mounting the O-ring and the retaining ring.
Pour finir, les dispositifs d'étanchéité similaires à celui décrit dans le document US 5 779 286 nécessitent un montage préalable des éléments d'étanchéité sur le tube métallique, puis un montage en force du tube synthétique, rendant im possible u n raccordement manuel des tubes synthétique et métallique, par exemple sur véhicule.  Finally, the sealing devices similar to that described in the document US Pat. No. 5,779,286 require a prior assembly of the sealing elements on the metal tube, then a force-fitting of the synthetic tube, making it impossible to manually connect the tubes. synthetic and metallic, for example on a vehicle.
La présente invention vise à remédier à tout ou partie de ces inconvénients.  The present invention aims to remedy all or part of these disadvantages.
Le problème technique à la base de l'invention consiste donc à fournir un ensemble de raccordement comportant un dispositif d'étanchéité qui soit de structure simple et économique, tout en assurant une étanchéité satisfaisante entre les éléments à raccorder.  The technical problem underlying the invention is therefore to provide a connection assembly comprising a sealing device which is simple and economical structure, while ensuring a satisfactory seal between the elements to be connected.
A cet effet, l'invention concerne un ensemble de raccordement comprenant :  For this purpose, the invention relates to a connection assembly comprising:
- un premier élément tubulaire métallique présentant une portion d'extrémité comportant des moyens de butée,  a first metal tubular element having an end portion comprising abutment means,
- un second élément tubulaire réalisé en matière synthétique et emmanché autour de la portion d'extrémité du premier élément tubulaire, et  a second tubular element made of synthetic material and fitted around the end portion of the first tubular element, and
- un dispositif d'étanchéité emmanché sur la portion d'extrémité du premier élément tubulaire de telle sorte qu'il prenne appui contre les moyens de butée, le dispositif d'étanchéité comportant une bague rigide montée sur la portion d'extrémité du premier élément tubulaire, et des premiers et seconds moyens d'étanchéité élastiques solidaires de la bague rigide, les premiers moyens d'étanchéité faisant saillie de la surface extérieure de la bague rigide et coopérant avec la surface intérieure du second élément tubulaire et les seconds moyens d'étanchéité faisant saillie de la surface intérieure de la bague rigide et coopérant avec la surface extérieure de la portion d'extrémité du premier élément tubulaire. a sealing device fitted on the end portion of the first tubular element so that it bears against the abutment means, the sealing device comprising a rigid ring mounted on the end portion of the first element; tubular, and first and second elastic sealing means integral with the rigid ring, the first sealing means projecting from the outer surface of the rigid ring and cooperating with the inner surface of the second tubular element and the second means of sealing protruding from the inner surface of the ring rigid and cooperating with the outer surface of the end portion of the first tubular member.
Compte tenu du fait que les premiers et seconds moyens d'étanchéité sont solidaires de la bague rigide, ces derniers ne sont pas susceptibles de se déplacer par rapport à la bague et les risques d'extraction ou de mauvais positionnement de joints durant le montage sont ainsi amplement réduits. Il n'est également plus possible d'oublier de positionner les moyens d'étanchéité sur l'élément tubulaire métallique et une seule opération de montage suffit à positionner la bague d'étanchéité contrairement à certains concepts, tels que celui décrit dans le document US 5 779 286 nécessitant deux opérations de montage, une première pour le joint, une seconde pour la bague de maintien. En outre, un parfait positionnement de la bague par rapport à l'élément tubulaire métallique assure un parfait positionnement des moyens d'étanchéité.  Given the fact that the first and second sealing means are integral with the rigid ring, the latter are not likely to move relative to the ring and the risk of extraction or mispositioning of seals during assembly are thus greatly reduced. It is also no longer possible to forget to position the sealing means on the metal tubular element and a single assembly operation is sufficient to position the sealing ring contrary to certain concepts, such as that described in the US document. 5,779,286 requiring two assembly operations, one for the seal, one for the retaining ring. In addition, a perfect positioning of the ring relative to the metal tubular element ensures a perfect positioning of the sealing means.
Par conséquent, le dispositif d'étanchéité selon l'invention permet d'assurer une étanchéité satisfaisante entre les éléments tubulaire à raccorder.  Consequently, the sealing device according to the invention makes it possible to ensure a satisfactory seal between the tubular elements to be connected.
De plus, le dispositif d'étanchéité selon l'invention permet de réaliser l'élément tubulaire métallique avec des tolérances de fabrication moins précises. En effet, par un dimensionnel adéquat des premiers et seconds moyens d'étanchéité, il est possible d'absorber des tolérances plus importantes que par une étanchéité directe tube métallique/tube synthétique. De même, les premiers et seconds moyens d'étanchéité permettent de compenser certains défauts de surface des tubes métallique (externes) et synthétique (internes). Les premiers et seconds moyens d'étanchéité permettent notamment d'éviter de dégrader la liaison du fait de certaines évolutions de propriétés du tube synthétique en vieillissement (fluage, thermo-oxydation, gonflement, ...).  In addition, the sealing device according to the invention makes it possible to produce the metal tubular element with less precise manufacturing tolerances. Indeed, by adequate dimensionality of the first and second sealing means, it is possible to absorb greater tolerances than a direct seal metal tube / synthetic tube. Similarly, the first and second sealing means make it possible to compensate for certain surface defects of the (external) and synthetic (internal) metal tubes. The first and second sealing means make it possible in particular to avoid degrading the connection because of certain changes in the properties of the synthetic tube in aging (creep, thermo-oxidation, swelling, etc.).
De plus, la bague est préférentiellement injectée, ce qui permet d'obtenir des tolérances dimensionnelles plus resserrées que ce qu'il est possible d'obtenir sur l'extrémité mise en forme du tube métallique.  In addition, the ring is preferably injected, which allows to obtain dimensional tolerances closer than what is possible to obtain on the shaped end of the metal tube.
De préférence, les premiers et/ou les seconds moyens d'étanchéité comportent au moins un joint annulaire surmoulé sur la bague rig ide. Avantageusement, la bague rigide comporte au moins une gorge annulaire dans laquelle est surmoulé un joint annulaire.  Preferably, the first and / or second sealing means comprise at least one annular seal overmolded on the rigid ring. Advantageously, the rigid ring comprises at least one annular groove in which is molded an annular seal.
Le fait de surmouler les joints d'étanchéité sur la bague rigide permet une plus grande latitude sur la géométrie des joints par rapport aux dispositifs d'étanchéité existants utilisant des joints toriques conventionnels. Ainsi, les joints peuvent avoir des surfaces de contact avec les tubes plus importantes qu'un joint torique, optimisant ainsi les performances d'étanchéité et de perméabilité. De cette manière, la présente invention permet de disposer d'une plus grande latitude sur les tolérances dimensionnelles des tubes à relier (d iamètre externe du tu be métallique et d ia m ètre interne du tube thermoplastique) que d'autres concepts, tels que celui décrit dans le document U S 5 779 286 nécessitant des tolérances dimensionnelles relativement resserrées. Over-molding the seals on the rigid ring allows greater latitude in the geometry of the seals compared to existing seals using conventional O-rings. Thus, the seals can have larger contact surfaces with the tubes than an O-ring, thus optimizing the sealing and permeability performance. In this way, the present invention makes it possible to have a greater latitude on the dimensional tolerances of the tubes to be connected (external diameter of the metal tube and internal diameter of the thermoplastic tube) than other concepts, such as that described in US 5,779,286 requiring relatively tight dimensional tolerances.
Le dispositif d'étanchéité selon la présente invention supporte notamment des défauts d'états de surface, notamment sur le tube métallique, par exemple liés à son recouvrement, à l'opération de déformation d'extrémité, à une ligne de soudure, ...  The sealing device according to the present invention in particular supports defects in surface conditions, in particular on the metal tube, for example related to its covering, to the end deformation operation, to a weld line, etc. .
Afin d'assurer une étanchéité et une tenue satisfaisante de la bague rigide sur le tube métallique, le diamètre interne du joint faisant saillie de la surface intérieure de la bague est de préférence inférieur au diamètre externe de la portion d'extrémité du tube métallique de manière à assurer une interférence suffisante et permettant d'atteindre le taux de compression du joint garantissant une efficacité optimale.  In order to ensure a seal and a satisfactory holding of the rigid ring on the metal tube, the internal diameter of the seal projecting from the inner surface of the ring is preferably smaller than the outer diameter of the end portion of the metal tube of to ensure sufficient interference and to achieve the compression ratio of the seal ensuring optimum efficiency.
Il est également possible d'adapter le dimensionnement et la matière de la bague rigide afin de contribuer à la tenue de cette dernière sur le tube métallique.  It is also possible to adapt the dimensioning and the material of the rigid ring to contribute to the holding of the latter on the metal tube.
De façon avantageuse, les premiers et les seconds moyens d'étanchéité sont décalés axialement. Ces dispositions permettent de limiter le porte à faux de la bague rigide et de stabiliser au maximum la bague lors du montage en force du second tube thermoplastique. Le joint faisant saillie de la surface intérieure de la bague est avantageusement positionné à l'arrière de la bague, c'est-à-dire du côté opposée à l'extrémité libre de la portion d'extrémité du tube métallique.  Advantageously, the first and second sealing means are offset axially. These provisions make it possible to limit the overhang of the rigid ring and to stabilize the ring as much as possible during the force-fitting of the second thermoplastic tube. The gasket projecting from the inner surface of the ring is advantageously positioned at the rear of the ring, that is to say on the opposite side to the free end of the end portion of the metal tube.
Selon un mode de réalisation de l'invention, les premiers et les seconds moyens d'étanchéité sont réalisés en différents matériaux. Ces dispositions permettent d'optimiser l'étanchéité du raccordement.  According to one embodiment of the invention, the first and second sealing means are made of different materials. These provisions make it possible to optimize the tightness of the connection.
Selon un mode de réalisation de l'invention, les premiers moyens d'étanchéité comportent deux joints annulaires surmoulés sur la bague et décalés axialement, et les seconds moyens d'étanchéité comportent deux jo i nts a n n u l a i res s u rm ou l és s u r l a bag u e et d écalés axialement. Avantageusement, les quatre joints annulaires sont surmoulés sur la bague en une seule opération et éventuellement reliés entre eux. De préférence, chaque joint annulaire appartenant aux premiers moyens d'étanchéité est disposé sensiblement dans le même plan que l'un des joints annulaires appartenant aux seconds moyens d'étanchéité. Des combinaisons de matières différentes pour les différents joints sont alors possibles pour optimiser l'étanchéité et la perméabilité de la liaison. Il est ainsi par exemple envisageable de disposer d'une première rangée de joints interne et externe (situés axialement du côté de l'élément tubulaire synthétique) dans une matière optimisée pour le contact avec le fluide et une seconde rangée de joints interne et externe (situés axialement du côté de l'élément tubulaire métallique) dans une matière optimisée pour l'étanchéité avec l'air ambiant. According to one embodiment of the invention, the first sealing means comprise two annular seals overmolded on the ring and axially offset, and the second sealing means comprise two annuli ann on or on the bag. and displaced axially. Advantageously, the four annular seals are overmolded on the ring in a single operation and possibly linked together. Preferably, each annular seal belonging to the first sealing means is disposed substantially in the same plane as one of the annular seals belonging to the second sealing means. Combinations of different materials for the different joints are then possible to optimize the sealing and permeability of the connection. For example, it is conceivable to have a first row of internal and external seals (situated axially on the side of the synthetic tubular element) in a material optimized for contact with the fluid and a second row of internal and external seals ( located axially on the side of the metal tubular element) in a material optimized for sealing with the ambient air.
De préférence, les seconds moyens d'étanchéité disposent d'une interférence avec l'élément tubulaire métallique suffisante afin que leur compression garantisse une excellente étanchéité et perméabilité.  Preferably, the second sealing means have an interference with the metal tubular element sufficient for their compression to ensure excellent sealing and permeability.
La bague d'étanchéité est ainsi montée légèrement serrée sur l'élément tubulaire métallique, grâce à la fois à la compression des seconds moyens d'étanchéité et à la rigidité de bague.  The sealing ring is thus mounted slightly tight on the metal tubular element, thanks to both the compression of the second sealing means and the ring stiffness.
Ce montage serré permet en outre de gérer l'élément tubulaire métallique équipé de sa bague d'étanchéité comme un produit semi fini avant montage de l'élément tubulaire thermoplastique, ce qui est beaucoup plus difficile avec les concepts existants, tels que ceux décrits dans le document US 5 779 286 où la tenue de l'embout plastique à l'extrémité de l'élément tubulaire métallique est beaucoup plus précaire.  This tight assembly also makes it possible to manage the tubular metal element equipped with its sealing ring as a semi-finished product before mounting the thermoplastic tubular element, which is much more difficult with existing concepts, such as those described in FIG. US 5,779,286 where the holding of the plastic tip at the end of the metal tubular element is much more precarious.
De façon avantageuse, la bague rigide comporte au moins un orifice traversant, et les premiers et seconds moyens d'étanchéité sont reliés entre eux à travers l'au moins un orifice traversant. Une telle liaison entre les premiers et seconds moyens d'étanchéité renforce la tenue mécanique des premiers et seconds moyens d'étanchéité sur la bague rigide, et contribue notamment à la résistance des premiers et seconds moyens d'étanchéité lors des opérations de montage du dispositif d'étanchéité sur le premier élément tubulaire, et du second élément tubulaire sur le premier élément tubulaire équipé du dispositif d'étanchéité.  Advantageously, the rigid ring has at least one through orifice, and the first and second sealing means are interconnected through the at least one through orifice. Such a connection between the first and second sealing means reinforces the mechanical strength of the first and second sealing means on the rigid ring, and contributes in particular to the resistance of the first and second sealing means during assembly operations of the device sealing on the first tubular element, and the second tubular element on the first tubular element equipped with the sealing device.
Préférentiellement, la bague rigide comporte des premiers moyens d'accrochage de la bague sur la portion d'extrémité du premier élément tubulaire. Avantageusement, les premiers moyens d'accrochage comportent au moins un organe élastiquement déformable agencé pour coopérer avec un élément en saillie ménagé sur la surface extérieure de la portion d'extrémité du premier élément tubulaire de manière à assurer un accrochage de la bague rigide sur la portion d'extrémité. De façon préférentielle, l'organe élastiquement déformable est une languette élastiquement déformable. De préférence, chaque languette élastiquement déformable est munie, à son extrémité libre, d'une portion formant crochet agencée pour coopérer avec l'élément en saillie ménagé sur la surface extérieure de la portion d'extrémité du premier élément tubulaire. Preferably, the rigid ring comprises first hooking means of the ring on the end portion of the first tubular element. Advantageously, the first hooking means comprise at least one elastically deformable member arranged to cooperate with a projecting element formed on the outer surface of the end portion of the first tubular element so as to ensure that the rigid ring is hooked onto the end portion. Preferably, the elastically deformable member is an elastically deformable tongue. Preferably, each elastically deformable tongue is provided, at its free end, with a hook portion arranged to cooperate with the projecting element formed on the outer surface of the end portion of the first tubular element.
Selon un mode de réalisation de l'invention, la bague rigide comporte des seconds moyens d'accrochage de la bague sur le second élément tubulaire.  According to one embodiment of the invention, the rigid ring comprises second attachment means of the ring on the second tubular element.
De préférence, les seconds moyens d'accrochage comportent au moins un élément en saillie ménagé sur la surface extérieure de la bague rigide. L'élément en saillie contribue à la tenue de l'élément tubulaire synthétique sur la bague rigide, ainsi qu'à l'étanchéité entre la bague et l'élément tubulaire synthétique  Preferably, the second attachment means comprise at least one projecting element formed on the outer surface of the rigid ring. The projecting element contributes to the holding of the synthetic tubular element on the rigid ring, as well as to the seal between the ring and the synthetic tubular element
Avantageusement, l'extrémité de la bague rigide tournée du côté de l'extrémité libre de la portion d'extrémité du premier élément tubulaire est délimitée extérieurement par une surface sensiblement tronconique. Ces dispositions permettent un centrage du tube synthétique et une répartition optimale des efforts exercés sur ce dernier lors de son montage autour de la bague rigide, cette dernière évasant progressivement le tube synthétique jusqu'à l'atteinte de son diamètre maximum.  Advantageously, the end of the rigid ring turned towards the free end of the end portion of the first tubular element is delimited externally by a substantially frustoconical surface. These arrangements allow a centering of the synthetic tube and an optimal distribution of forces exerted on the latter during its assembly around the rigid ring, the latter gradually widening the synthetic tube until reaching its maximum diameter.
La bag ue rig ide est préférentiellement réalisée en matière synthétique, et avantageusement en matière thermoplastique.  The rigid bag is preferably made of synthetic material, and advantageously of thermoplastic material.
Les premiers et les seconds moyens d'étanchéité sont de préférence réalisés en élastomère, et avantageusement un élastomère adapté pour permettre une accroche chimique avec la bague rigide. Une telle accroche permet de renforcer la tenue physique du joint et l'étanchéité de l'ensemble.  The first and second sealing means are preferably made of elastomer, and advantageously an elastomer adapted to allow a chemical grip with the rigid ring. Such a grip makes it possible to reinforce the physical strength of the seal and the tightness of the assembly.
Selon une première alternative, les moyens de butée comportent un bourrelet, de préférence annulaire, s'étendant radialement vers l'extérieur à partir de la surface extérieure de la portion d'extrémité du premier élément tubulaire. Ce bourrelet peut dans certaines configurations aider à la retenue de l'élément tubulaire en matière synthétique monté en force et peut même constituer une surface d'étanchéité additionnelle. Il peut également servir, dans d'autres configurations, de retenue pour les premiers moyens d'accrochage de la bague. According to a first alternative, the abutment means comprise a bead, preferably annular, extending radially outwardly from the outer surface of the end portion of the first tubular element. This bead can in certain configurations help to retain the tubular element made of synthetic material mounted in force and can even constitute an additional sealing surface. It can also be used, in other configurations, retaining for the first hooking means of the ring.
Selon une seconde alternative, les moyens de butée sont constitués par l'extrémité libre de la portion d'extrémité de l'élément tubulaire métallique.  According to a second alternative, the abutment means are constituted by the free end of the end portion of the metal tubular element.
Avantageusement, l'extrémité libre de la portion d'extrémité du premier élément tubulaire est délimitée extérieurement par une surface sensiblement tronconique.  Advantageously, the free end of the end portion of the first tubular element is delimited externally by a substantially frustoconical surface.
Préférentiellement, l'extrémité de la bague rigide tournée du côté de l'extrémité libre de la portion d'extrémité du premier élément tubulaire présente un diamètre externe inférieur au diamètre interne du second élément tubulaire.  Preferably, the end of the rigid ring turned towards the free end of the end portion of the first tubular element has an outer diameter smaller than the internal diameter of the second tubular element.
De façon préférentielle, la bague rigide prend appui contre les moyens de butée.  Preferably, the rigid ring bears against the abutment means.
Selon un mode de réalisation de l'invention, les premiers moyens d'étanchéité comprennent une nervure annulaire et une rainure annulaire, la nervure annulaire étant agencée pour coopérer avec la surface intérieure du second élément tubulaire et pour se déformer au moins en partie dans la rainure annulaire, en position emmanchée des premier et second éléments tubulaires. La rainure annulaire est de préférence plus éloignée de l'extrémité de la bague rigide tournée du côté de l'extrémité libre de la portion d'extrémité du premier élément tubulaire que la nervure annulaire.  According to one embodiment of the invention, the first sealing means comprise an annular rib and an annular groove, the annular rib being arranged to cooperate with the inner surface of the second tubular element and to deform at least in part in the annular groove, in the fitted position of the first and second tubular elements. The annular groove is preferably further from the end of the rigid ring turned towards the free end of the end portion of the first tubular element that the annular rib.
Selon une variante de réalisation de l'ensemble de raccordement, le second élément tubulaire est réalisé en matière plastique, et de préférence en matière thermoplastique.  According to an alternative embodiment of the connection assembly, the second tubular element is made of plastic material, and preferably of thermoplastic material.
La tenue de l'élément tubulaire synthétique sur l'élément tubulaire métallique est assurée par :  The holding of the synthetic tubular element on the metallic tubular element is ensured by:
- la bague montée en force sur l'élément tubulaire métallique, l'élément tubulaire synthétique étant lui même montée en force sur la bague dont les moyens d'étanchéité faisant saillie de sa surface extérieure, ainsi que d'éventuels renflements rigides assurent la retenue de l'élément tubulaire synthétique sur la bague  the ring mounted in force on the metallic tubular element, the synthetic tubular element being itself mounted in force on the ring, the sealing means projecting from its outer surface, as well as any rigid bulges ensuring the restraint. of the synthetic tubular element on the ring
- le bourrelet formant butée pour le dispositif d'étanchéité, l'élément tubulaire synthétique monté en force venant épouser la forme de ce bourrelet et ne pouvant ainsi plus être désolidarisé de l'élément tubulaire métallique. De façon avantag euse, le second él ément tubulaire est élastiquement déformable. the bead forming an abutment for the sealing device, the synthetic tubular element mounted in force coming to conform to the shape of this bead and thus no longer being able to separate from the metal tubular element. Advantageously, the second tubular element is elastically deformable.
De toute façon l'invention sera bien comprise à l'aide de la description qui suit en référence au dessin schématique annexé représentant, à titre d'exemples non limitatifs, plusieurs formes de réalisation de cet ensemble de raccordement.  In any case the invention will be better understood with the aid of the description which follows with reference to the appended schematic drawing showing, by way of non-limiting examples, several embodiments of this connection assembly.
Figure 1 est une vue en coupe longitudinale d'un ensemble de raccordement selon l'invention.  Figure 1 is a longitudinal sectional view of a connection assembly according to the invention.
Figure 2 est une vue, à l'échelle agrandie, d'un détail de la figure 1. Figure 3 est une vue de côté de la bague rigide du dispositif d'étanchéité montré sur la figure 1.  Figure 2 is an enlarged view of a detail of Figure 1. Figure 3 is a side view of the rigid ring of the sealing device shown in Figure 1.
Figure 4 est une vue en coupe longitudinale d'un ensemble de raccordement selon un deuxième mode de réalisation.  Figure 4 is a longitudinal sectional view of a connection assembly according to a second embodiment.
Figure 5 et 6 sont des vues en coupe longitudinale d'un ensemble de raccordement selon un troisième et un quatrième modes de réalisation.  Figure 5 and 6 are longitudinal sectional views of a connection assembly according to third and fourth embodiments.
Figure 7 est une vue partielle en coupe longitudinale d'un ensemble de raccordement selon un sixième mode de réalisation.  Figure 7 is a partial longitudinal sectional view of a connection assembly according to a sixth embodiment.
Figure 8 est une vue en coupe longitud inale d'un dispositif d'étanchéité appartenant à un ensemble de raccordement selon un septième mode de réalisation.  Figure 8 is a longitudinal sectional view of a sealing device belonging to a connection assembly according to a seventh embodiment.
La figure 1 représente un ensemble de raccordement 2 comprenant :  FIG. 1 represents a connection assembly 2 comprising:
- un élément tubulaire métallique 3 présentant une portion d'extrémité 4 comportant un bourrelet annulaire 5 s'étendant radialement vers l'extérieur à partir de la surface extérieure de cette dernière,  a metal tubular element 3 having an end portion 4 comprising an annular bead 5 extending radially outwards from the outer surface thereof;
- un élément tubulaire polymérique 6 emmanché autour de la portion d'extrémité 4 de l'élément tubulaire métallique 3, et  a polymeric tubular element 6 fitted around the end portion 4 of the metal tubular element 3, and
- un dispositif d'étanchéité 7 emmanché sur la portion d'extrémité 4 de l'élément tubulaire métallique 3.  a sealing device 7 fitted on the end portion 4 of the metal tubular element 3.
Le dispositif d'étanchéité 7 comporte une bague rigide 8 destinée à être emmanchée sur la portion d'extrémité 4 de l'élément tubulaire métallique 3 de telle sorte qu'elle prenne appui contre le bourrelet annulaire 5. La bague rigide 8 est réalisée de préférence en matière synthétique.  The sealing device 7 comprises a rigid ring 8 intended to be fitted on the end portion 4 of the metal tubular element 3 so that it bears against the annular bead 5. The rigid ring 8 is made of preferably of synthetic material.
Comme montré plus particulièrement sur les figures 2 et 3, l'extrémité 9 de la bague rigide 8 destinée à être tournée du côté de l'extrémité libre de la portion d'extrémité 4 est délimitée extérieurement par une surface sensiblement tronconique assurant un évasement progressif de l'élément tubulaire polymérique 6, son centrage, une répartition homogène des efforts d'emmanchement. As shown more particularly in Figures 2 and 3, the end 9 of the rigid ring 8 intended to be turned towards the free end of the end portion 4 is delimited externally by a surface substantially frustoconical ensuring a progressive widening of the polymeric tubular element 6, its centering, a homogeneous distribution of the fitting forces.
De préférence, l'extrémité 9 de la bague rigide 8 présente un diamètre externe inférieur au d iamètre interne de l'élément tubulaire polymérique 6. Le diamètre externe de la bague rigide 8 augmente ensuite le long de la portion de cône pour atteindre un diamètre avantageusement supérieur au diamètre interne de l'élément tubulaire polymérique 6.  Preferably, the end 9 of the rigid ring 8 has an outer diameter smaller than the internal diameter of the polymeric tubular element 6. The outer diameter of the rigid ring 8 then increases along the cone portion to reach a diameter advantageously greater than the internal diameter of the polymeric tubular element 6.
La bague rigide 8 comporte une première gorge annulaire 11 ménagée sur sa surface extérieure et une seconde gorge annulaire 12 ménagée sur sa surface intérieure.  The rigid ring 8 has a first annular groove 11 formed on its outer surface and a second annular groove 12 formed on its inner surface.
La bague rigide 8 comporte en outre au moins deux orifices 13 débouchant respectivement dans le fond des première et seconde gorges annulaires 11 , 12.  The rigid ring 8 further comprises at least two openings 13 opening respectively into the bottom of the first and second annular grooves 11, 12.
Comme montré plus particulièrement sur la figure 2, le dispositif d'étanchéité 7 comporte également un premier joint annulaire 14 surmoulé dans la première gorge 1 1 et un second joint annulaire 15 surmoulé dans la seconde gorge 12. Les premier et second joints annulaires 14, 15 s'étendent sensiblement de manière coplanaire. Les premier et second joints annulaires 14, 15 sont, selon cette variante de réalisation, réalisés en un matériau identique.  As shown more particularly in FIG. 2, the sealing device 7 also comprises a first annular seal 14 overmolded in the first groove 11 and a second annular seal 15 overmolded in the second groove 12. The first and second annular joints 14, 15 extend substantially coplanarly. The first and second annular seals 14, 15 are, according to this embodiment variant, made of an identical material.
Le premier joint annulaire 14 fait saillie radialement de la surface extérieure de la bague rigide 8 et est agencé pour assurer l'étanchéité avec la surface intérieure de l'élément tubulaire polymérique 6, tandis que le second joint annulaire 15 fait saillie radialement de la surface intérieure de la bague rigide et est agencé pour assurer l'étanchéité avec la surface extérieure de la portion d'extrémité 4 de l'élément tubulaire métallique 3.  The first annular seal 14 protrudes radially from the outer surface of the rigid ring 8 and is arranged to seal with the inner surface of the polymeric tubular element 6, while the second annular seal 15 projects radially from the surface. inner of the rigid ring and is arranged to seal with the outer surface of the end portion 4 of the metal tubular element 3.
Il convient de noter qu'avant le montage de l'élément tubulaire polymérique 6 sur la bague rigide, le diamètre externe du joint annulaire 14 est supérieur au diamètre interne de l'élément tubulaire polymérique 6 de manière à ce qu'une interférence optimisant la compression du joint 14 soit réalisée après le montage de l'élément tubulaire polymérique 6.  It should be noted that before mounting the polymeric tubular element 6 to the rigid ring, the outer diameter of the annular seal 14 is greater than the internal diameter of the polymeric tubular member 6 so that interference optimizing the compression of the seal 14 is carried out after mounting of the polymeric tubular element 6.
Il convient également de noter qu'avant le montage de la bague rigide 8 sur l'élément tubulaire métallique 3, le diamètre interne du joint annulaire 15 est inférieur au diamètre externe de la portion d'extrémité 4 de l'élément tubulaire métallique 3 de manière à ce qu'une interférence optimisant la compression du joint 15 soit réalisée après le montage de la bague. It should also be noted that before mounting the rigid ring 8 on the metal tubular element 3, the inner diameter of the annular seal 15 is smaller than the outer diameter of the end portion 4 of the tubular metal element 3 so that an interference optimizing the compression of the seal 15 is made after the mounting of the ring.
L'extrémité libre de la portion d'extrémité 4 de l'élément tubulaire métallique 6 est délimitée extérieurement par une surface sensiblement tronconique de manière à faciliter le montage de la bague rigide 8 sur la portion d'extrémité 4, assurer une répartition homogène des efforts d'emmanchement et une compression progressive du joint annulaire 15 lors du montage de la bague sur la portion d'extrémité 4.  The free end of the end portion 4 of the metal tubular element 6 is delimited externally by a substantially frustoconical surface so as to facilitate the mounting of the rigid ring 8 on the end portion 4, to ensure a homogeneous distribution of the forces of fitting and a progressive compression of the annular seal 15 during assembly of the ring on the end portion 4.
Selon une variante de réalisation de l'invention, les premier et second joints annulaires 14, 15 pourraient être réalisés en différents matériaux.  According to an alternative embodiment of the invention, the first and second annular seals 14, 15 could be made of different materials.
La figure 4 représente une variante de réalisation de l'élément de raccordement qui diffère de celle représentée sur les figures 1 et 2 en ce que les joints annulaires 14, 15 sont décalés axialement afin d'augmenter la stabilité de la bague.  Figure 4 shows an alternative embodiment of the connecting element which differs from that shown in Figures 1 and 2 in that the annular seals 14, 15 are offset axially to increase the stability of the ring.
Les figures 5 et 6 représentent deux variantes de réalisation de l'élément de raccordement qui diffèrent de celle représentée sur les figures 1 et 2 en ce q u e le dispositif d'étanchéité 7 comporte des premiers moyens d'accrochage de la bague rigide 8 sur la portion d'extrémité 4 de l'élément tubulaire métallique 3, et des seconds moyens d'accrochage de la bague rigide sur l'élément tubulaire polymérique 6.  FIGS. 5 and 6 show two embodiments of the connection element which differ from that shown in FIGS. 1 and 2 in that the sealing device 7 comprises first attachment means for the rigid ring 8 on the end portion 4 of the metal tubular element 3, and second hooking means of the rigid ring on the polymeric tubular element 6.
Les premiers moyens d'accrochage comportent une pluralité de languettes élastiquement déformables 21 s'étendant axialement à partir de l'extrémité de la bague rigide 8 tournée du côté du bourrelet annulaire 5. Chaque languette élastiquement déformable 21 est munie, à son extrémité libre, d'une portion formant crochet 22 agencée pour coopérer avec le bourrelet annulaire 5 ménagé sur la portion d'extrémité 4 de l'élément tubulaire métallique 3.  The first attachment means comprise a plurality of elastically deformable tongues 21 extending axially from the end of the rigid ring 8 turned towards the annular bead 5. Each elastically deformable tongue 21 is provided at its free end with a hook portion 22 arranged to cooperate with the annular bead 5 formed on the end portion 4 of the metal tubular element 3.
Les seconds moyens d'accrochage comportent un bourrelet annulaire 23 ménagé sur la surface extérieure de la bague rigide 8, le bourrelet annulaire 23 contribuant à la tenue de l'élément tubulaire polymérique 6 sur la bague, ainsi qu'à l'étanchéité entre la bague et l'élément tubulaire polymérique.  The second hooking means comprise an annular bead 23 formed on the outer surface of the rigid ring 8, the annular bead 23 contributing to the holding of the polymeric tubular element 6 on the ring, and to the seal between the ring and the polymeric tubular element.
Selon la variante représentée sur la fig ure 5, le procédé d'assemblage du dispositif d'étanchéité 7 sur les éléments tubulaires 3, 6 consiste à introduire la bague rigide 8 dans l'élément tubulaire polymérique 6 jusqu'à ce que le bourrelet annulaire 23 soit franchi, et ensuite à emmancher la bague rigide 8 sur la portion d'extrémité 4 de l'élément tubulaire métallique 3 jusq u 'à ce q ue l a portion formant crochet 22 de chaque languette élastiquement déformable 21 coopère avec le bourrelet annulaire 5. According to the variant shown in FIG. 5, the method of assembling the sealing device 7 on the tubular elements 3, 6 consists in introducing the rigid ring 8 into the polymeric tubular element 6 until the annular bead 23 is crossed, and then to press the rigid ring 8 on the end portion 4 of the metal tubular element 3 until the hook portion 22 of each resiliently deformable tongue 21 cooperates with the annular bead 5.
Cette configuration du dispositif d'étanchéité 7 peut permettre une livraison par exemple d'un tube synthétique équipé de la bague rigide 6, ensuite monté sur une canalisation ou un embout métallique, par exemple sur véhicule.  This configuration of the sealing device 7 may allow delivery, for example of a synthetic tube equipped with the rigid ring 6, then mounted on a pipe or a metal tip, for example on a vehicle.
Selon la variante représentée sur la figure 6, le procédé d'assemblage du dispositif d'étanchéité 7 sur les éléments tubulaires 3, 6 consiste à emmancher la bague rigide 8 sur la portion d'extrémité 4 jusqu'à ce que la portion formant crochet 22 de chaque languette élastiquement déformable 21 coopère avec le bourrelet annulaire 5, et ensuite à monter en force l'élément tubulaire polymérique 6 sur l'élément tubulaire métallique 3 muni de la bague rigide 8 jusqu'à ce que les portion formant crochet 22 soient franchies. L'élément tubulaire polymérique 6 recouvrant ainsi les portions formant crochet 22 augmente encore l'accroche de ces dernières sur le bourrelet 5 et renforce la résistance à l'arrachement entre l'élément tubulaire polymérique 6, la bague rigide 8 et l'élément tubulaire métallique.  According to the variant shown in FIG. 6, the method of assembling the sealing device 7 on the tubular elements 3, 6 consists in inserting the rigid ring 8 on the end portion 4 until the hook portion 22 of each elastically deformable tongue 21 cooperates with the annular bead 5, and then to force the polymeric tubular element 6 on the metal tubular element 3 provided with the rigid ring 8 until the hook portions 22 are crossed. The polymeric tubular element 6 thus covering the hook portions 22 further increases the grip of the latter on the bead 5 and increases the tear resistance between the polymeric tubular element 6, the rigid ring 8 and the tubular element metallic.
Un tel procédé d'assemblage présente l'inconvénient d'empêcher un montage préalable de la bague 8 sur l'élément tubulaire polymérique 6 avant montage sur l'élément tubulaire métallique 3.  Such an assembly method has the disadvantage of preventing a prior assembly of the ring 8 on the polymeric tubular element 6 before mounting on the metal tubular element 3.
La figure 7 représente une variante de réalisation de l'élément de raccordement qui diffère de celle représentée sur les figures 1 et 2 en ce que l'extrémité 9 de la bague rigide 8 prend appui contre l'extrémité libre de la portion d'extrémité 4 de l'élément tubulaire métallique 3 et non pas contre le bourrelet annulaire 5.  FIG. 7 represents an alternative embodiment of the connecting element which differs from that shown in FIGS. 1 and 2 in that the end 9 of the rigid ring 8 bears against the free end of the end portion. 4 of the metal tubular element 3 and not against the annular bead 5.
La figure 8 représente une variante de réalisation de l'élément de raccordement 2 qui diffère de celle représentée sur les figures 1 et 2 essentiellement en ce que le premier joint annulaire 14 comprend une nervure annulaire 24 et une rainure annulaire 25 plus éloignée de l'extrémité 9 de la bague rigide 8 que la nervure annulaire 24, la nervure annulaire 24 étant agencée pour coopérer avec la surface intérieure de l'élément tubulaire 6 et pour se déformer au moins en partie dans la rainure annulaire 25, en position emmanchée des deux éléments tubulaires 3, 6.  FIG. 8 shows an alternative embodiment of the connecting element 2 which differs from that shown in FIGS. 1 and 2 essentially in that the first annular seal 14 comprises an annular rib 24 and an annular groove 25 farther away from the end 9 of the rigid ring 8 that the annular rib 24, the annular rib 24 being arranged to cooperate with the inner surface of the tubular member 6 and to deform at least partially in the annular groove 25, in the fitted position of the two tubular elements 3, 6.
Comme il va de soi, l'invention ne se limite pas aux seules formes de réalisation de cet ensemble de raccordement, décrites ci-dessus à titre d'exemples, elle en embrasse au contraire toutes les variantes de réalisation.  As goes without saying, the invention is not limited to the embodiments of this connection assembly, described above as examples, it encompasses all the variants.

Claims

REVENDICATIONS
1. Ensemble de raccordement (2), caractérisé en ce qu'il comprend : 1. Connection assembly (2), characterized in that it comprises:
- un premier élément tubulaire métallique (3) présentant une portion d'extrémité (4) comportant des moyens de butée (5),  a first metal tubular element (3) having an end portion (4) comprising abutment means (5),
- un second élément tubulaire (6) réalisé en matière synthétique et emmanché autour de la portion d'extrémité du premier élément tubulaire, et  a second tubular element (6) made of synthetic material and fitted around the end portion of the first tubular element, and
- un dispositif d'étanchéité (7) emmanché sur la portion d'extrémité - a sealing device (7) fitted on the end portion
(4) du premier élément tubulaire de telle sorte qu'il prenne appui contre les moyens de butée, le dispositif d'étanchéité comportant une bague rigide (8) montée sur la portion d'extrémité (4) du premier élément tubulaire, et des premiers et seconds moyens d'étanchéité élastiques (14, 15) solidaires de la bague rigide, les premiers moyens d'étanchéité (14) faisant saillie de la surface extérieure de la bague rigide et coopérant avec la surface intérieure du second élément tubulaire (6) et les seconds moyens d'étanchéité (15) faisant saillie de la surface intérieure de la bague rigide et coopérant avec la surface extérieure de la portion d'extrémité (4) du premier élément tubulaire (3). (4) of the first tubular element so that it bears against the abutment means, the sealing device comprising a rigid ring (8) mounted on the end portion (4) of the first tubular element, and first and second elastic sealing means (14, 15) integral with the rigid ring, the first sealing means (14) projecting from the outer surface of the rigid ring and cooperating with the inner surface of the second tubular element (6 ) and the second sealing means (15) projecting from the inner surface of the rigid ring and cooperating with the outer surface of the end portion (4) of the first tubular element (3).
2. Ensemble de raccordement selon la revendication 1 , caractérisé en ce que les premiers et/ou les seconds moyens d'étanchéité comportent au moins un joint annulaire (14, 15) surmoulé sur la bague rigide (8). 2. Connection assembly according to claim 1, characterized in that the first and / or second sealing means comprise at least one annular seal (14, 15) overmolded on the rigid ring (8).
3. Ensemble de raccordement selon la revendication 2, caractérisé en ce que la bague rigide (8) comporte au moins une gorge annulaire (11 , 12) dans laquelle est surmoulé un joint annulaire (14, 15). 3. Connection assembly according to claim 2, characterized in that the rigid ring (8) comprises at least one annular groove (11, 12) in which is molded an annular seal (14, 15).
4. Ensemble de raccordement selon l'une des revendications 1 à 3, caractérisé en ce que les premiers et les seconds moyens d'étanchéité (14, 15) sont décalés axialement. 4. Connection assembly according to one of claims 1 to 3, characterized in that the first and second sealing means (14, 15) are offset axially.
5. Ensemble de raccordement selon l'une des revendications 1 à 4, caractérisé en ce que les premiers et les seconds moyens d'étanchéité (14, 15) sont réalisés en différents matériaux. 5. Connection assembly according to one of claims 1 to 4, characterized in that the first and the second sealing means (14, 15) are made of different materials.
6. Ensemble de raccordement selon l'une des revendications 1 à 5, caractérisé en ce que la bague rigide (8) comporte des premiers moyens d'accrochage de la bague sur la portion d'extrémité (4) du premier élément tubulaire (3). 6. Connection assembly according to one of claims 1 to 5, characterized in that the rigid ring (8) comprises first hooking means of the ring on the end portion (4) of the first tubular element (3). ).
7. Ensemble de raccordement selon la revendication 6, caractérisé en ce que les premiers moyens d'accrochage comportent au moins un organe élastiquement déformable (21 ) agencé pour coopérer avec un élément en saillie (5) ménagé sur la surface extérieure de la portion d'extrémité (4) du premier élément tubulaire (3). 7. Connection assembly according to claim 6, characterized in that the first attachment means comprise at least one elastically deformable member (21) arranged to cooperate with a projecting element (5) formed on the outer surface of the portion of end (4) of the first tubular element (3).
8. Ensemble de raccordement selon l'une des revendications 1 à 7, caractérisé en ce que la bague rigide (8) comporte des seconds moyens d'accrochage de la bague sur le second élément tubulaire (6). 8. Connection assembly according to one of claims 1 to 7, characterized in that the rigid ring (8) comprises second hooking means of the ring on the second tubular element (6).
9. Ensemble de raccordement selon la revendication 8, caractérisé en ce que les seconds moyens d'accrochage comportent au moins un élément en saillie (23) ménagé sur la surface extérieure de la bague rigide (8). 9. Connection assembly according to claim 8, characterized in that the second attachment means comprise at least one projecting element (23) formed on the outer surface of the rigid ring (8).
10. Ensemble de raccordement selon l'une des revendications 1 à10. Connection assembly according to one of claims 1 to
9, caractérisé en ce que l'extrémité (9) de la bague rigide (8) tournée du côté de l'extrémité libre de la portion d'extrémité (4) du premier élément tubulaire (3) est délimitée extérieurement par une surface sensiblement tronconique. 9, characterized in that the end (9) of the rigid ring (8) facing the free end of the end portion (4) of the first tubular element (3) is delimited externally by a surface substantially truncated.
11. Ensemble de raccordement selon l'une des revendications 1 à11. Connection assembly according to one of claims 1 to
10, caractérisé en ce que les moyens de butée comportent un bourrelet (5), de préférence annulaire, s'étendant radialement vers l'extérieur à partir de la surface extérieure de la portion d'extrémité (4) du premier élément tubulaire (3). 10, characterized in that the abutment means comprise a bead (5), preferably annular, extending radially outwardly from the outer surface of the end portion (4) of the first tubular element (3). ).
12. Ensemble de raccordement selon l'une des revendications 1 à12. Connection assembly according to one of claims 1 to
11 , caractérisé en ce que l'extrémité libre de la portion d'extrémité (4) du premier élément tubulaire (3) est délimitée extérieurement par une surface sensiblement tronconique. 11, characterized in that the free end of the end portion (4) of the first tubular element (3) is delimited externally by a substantially frustoconical surface.
13. Ensemble de raccordement selon l'une des revendications 1 à13. Connection assembly according to one of claims 1 to
12, caractérisé en ce que l'extrémité (9) de la bague rigide (8) tournée du côté de l'extrémité libre de la portion d'extrémité (4) du premier élément tubulaire (3) présente un diamètre externe inférieur au diamètre interne du second élément tubulaire (6). 12, characterized in that the end (9) of the rigid ring (8) turned towards the free end of the end portion (4) of the first tubular element (3) has an outside diameter smaller than the diameter. internal of the second tubular element (6).
14. Ensemble de raccordement selon l'une des revendications 1 à14. Connection assembly according to one of claims 1 to
13, caractérisé en ce que la bague rigide (8) prend appui contre les moyens de butée. 13, characterized in that the rigid ring (8) bears against the abutment means.
15. Ensemble de raccordement selon l'une des revendications 1 à15. Connection assembly according to one of claims 1 to
14, caractérisé en ce que les premiers moyens d'étanchéité comprennent une nervure annulaire (24) et une rainure annulaire (25), la nervure annulaire (24) étant agencée pour coopérer avec la surface intérieure du second élément tubulaire (6) et pour se déformer au moins en partie dans la rainure annulaire (25), en position emmanchée des premier et second éléments tubulaires (3, 6). 14, characterized in that the first sealing means comprise an annular rib (24) and an annular groove (25), the annular rib (24) being arranged to cooperate with the inner surface of the second tubular element (6) and for at least partially deform in the annular groove (25) in the fitted position of the first and second tubular elements (3, 6).
PCT/FR2010/051733 2009-08-27 2010-08-18 Assembly for connecting together a metal tubular element and a tubular element made of a synthetic material WO2011023888A1 (en)

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Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0955836A FR2949529B1 (en) 2009-08-27 2009-08-27 SEALING DEVICE FOR CONNECTION BETWEEN A METALLIC TUBULAR ELEMENT AND A TUBULAR ELEMENT PRODUCED IN SYNTHETIC MATERIAL
FR09/55836 2009-08-27

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US11435017B2 (en) * 2019-01-25 2022-09-06 Danfoss Power Solutions Ii Technology A/S Device for connecting a tubular element, a combination of a device with a tubular element and a bonding compound, as well as a method for connecting the device with a tubular element
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Also Published As

Publication number Publication date
FR2949529A1 (en) 2011-03-04
CN102216664A (en) 2011-10-12
CN102216664B (en) 2015-01-28
FR2949529B1 (en) 2015-04-24

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