EP3794253A1 - Seal, in particular for a rotary ball valve fitting - Google Patents

Seal, in particular for a rotary ball valve fitting

Info

Publication number
EP3794253A1
EP3794253A1 EP19723435.4A EP19723435A EP3794253A1 EP 3794253 A1 EP3794253 A1 EP 3794253A1 EP 19723435 A EP19723435 A EP 19723435A EP 3794253 A1 EP3794253 A1 EP 3794253A1
Authority
EP
European Patent Office
Prior art keywords
seal
rigid
flexible
sealing
annular
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19723435.4A
Other languages
German (de)
French (fr)
Inventor
Nicolas Becker
Francis Rolland
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sogefi Air and Cooling SAS
Original Assignee
Sogefi Air and Cooling SAS
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 Sogefi Air and Cooling SAS filed Critical Sogefi Air and Cooling SAS
Publication of EP3794253A1 publication Critical patent/EP3794253A1/en
Withdrawn legal-status Critical Current

Links

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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
    • F16K5/0663—Packings
    • F16K5/0673—Composite packings
    • 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
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
    • F16J15/3236—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips with at least one lip for each surface, e.g. U-cup packings
    • 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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
    • F16K5/0663—Packings
    • F16K5/0673—Composite packings
    • F16K5/0678—Composite packings in which only one of the components of the composite packing is contacting the plug
    • 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
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/164—Sealings between relatively-moving surfaces the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
    • 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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/06—Construction of housing; Use of materials therefor of taps or cocks
    • F16K27/067—Construction of housing; Use of materials therefor of taps or cocks with spherical plugs

Definitions

  • the present invention relates to the field of devices for regulating fluid circulation, more particularly proportional valves or operating according to the so-called "all or nothing" principle, and more particularly that of rotary ball valves and relates to a gasket. sealing, especially for such a rotary valve.
  • the joints employed always consist of several parts or elements, generally a sealing ring bearing on said plug, an annular sealing body and a reinforcing ring, which multiplies disadvantageously. the number of interfaces (and therefore the risk of leakage) and also complicates the assembly of the various components.
  • the present invention aims to propose a solution overcoming at least some of these disadvantages.
  • the invention proposes a seal, in particular for a rotary valve, preferably for a rotary valve with at least two channels and advantageously three-way, said seal having, on the one hand, a sealing body flexible and flexible annular static and provided with a radial lip and secondly, a rigid dynamic sealing ring made of a low friction material material, carried by said annular static sealing body, the formed structural assembly by the annular static sealing body and the dynamic sealing ring being arranged with sliding ability guided in the opening passage portion of the opening concerned, the rigid sealing ring bearing against said rotary plug, and the internal face of said sealing ring, opposite to that in contact with the rotary plug, coming opposite the inner face of the radial lip of the annular sealing body, opposite to the face coming into contact with the hollow body of the valve, the thrust force produced by the fluid at said seal causing the spacing of these two elements to ensure sealing, sealing gasket characterized in that the flexible and flexible annular static sealing body provided with a radial lip and the rigid dynamic sealing ring are made in one
  • a rotary valve preferably a two-way spherical rotary ball valve, characterized in that it comprises a seal according to the invention, a valve body defining a receiving chamber and a ball valve received in the receiving chamber of said valve body characterized in that it comprises a seal also according to the invention.
  • FIG. 1 schematically and schematically shows in section a ball valve with an inlet and an outlet (so-called two-way valve), provided with a seal according to the invention, in a suggested position. closed;
  • Fig. 2 is an enlarged partial view of the dotted region of Fig. 1;
  • FIGS. 4a and 4b respectively show a perspective view of a three-way ball valve complete with its fixing plate and its electric actuator or geared motor, for example for a motor vehicle and a perspective view in section along a plane. vertical passing through the center of the valve of Figure 4a;
  • Figure 5 shows a simplified greatly enlarged view of the active area of the seal according to the invention.
  • FIG. 6 shows a greatly enlarged simplified view of the active zone of an inverted seal according to the invention for a variant in which the flow direction of the fluid is reversed.
  • Figures 1 to 3 illustrate a seal 1 used, by way of preferred example, in a conventional rotary valve 2, as found for example in the field of the automotive industry.
  • a valve has a plurality of openings and at least one inlet opening and one fluid outlet opening.
  • the plug 2 may be made by molding a thermoplastic material, for example PPS (polyphenylene sulfide).
  • Such a valve shown schematically in Figure 1, here has a fluid inlet, a plug 2 and a fluid outlet.
  • It also comprises a hollow valve body 3, provided with at least one inlet opening and at least one outlet opening and defining a receiving chamber for said plug 2, the latter having a spherical outer surface, at least at the portion or portions of the outer surface facing the aperture (s) in any one of the possible rotational positions of said plug (2).
  • Said valve also comprises at least one device or seal 1 made, in accordance with the present invention, integrally, that is to say in one piece, installed coaxially in a portion of internal passage passing through at least one of the openings and comprising, on the one hand, an annular body provided with a flexible radial lip 4 'sealing against the inner face of the passage portion, on the other hand, a sealing ring 5 made in a material with a low coefficient of friction, carried by the annular sealing body and intended to bear tightly against the outer surface of the plug 2, and finally, an elastic prestressing means 6 axially biasing said annular sealing body towards the bushel 2, the whole structural member formed by said annular sealing body and said sealing ring being slidably arranged guided in the passage portion opening of the opening concerned.
  • a device or seal 1 made, in accordance with the present invention, integrally, that is to say in one piece, installed coaxially in a portion of internal passage passing through at least one of the openings and comprising, on the one hand, an
  • said seal 1 according to the invention in particular for a rotary valve, preferably for a two-way rotary valve, is distinguished in that it comprises on the one hand, a flexible and flexible annular sealing body 4 provided with a radial lip 4 'and, on the other hand, a rigid dynamic sealing ring 5 made of a material with a low coefficient of friction, carried by said annular static sealing body 4, the structural assembly formed by the annular static sealing body 4 and the dynamic sealing ring 5 being arranged with sliding ability guided in the passage portion opening out of the opening concerned, the rigid sealing ring 5 bearing against said plug 2, and the inner face 5 'of said sealing ring, opposite that in contact with the bushel ro 2, coming opposite the inner face 4 "of the radial lip 4 'of the annular sealing body 4, opposite the face coming into contact with the hollow body 3 of the valve, the thrust force produced by the fluid at the level of said seal 4 causing the spacing of these two elements 4, 5 to ensure sealing.
  • the pressure exerted by said fluid causes a spacing of the two elements 4, 5 to ensure the tightness of the assembly.
  • the pressure of the fluid which infiltrates between the hollow body 3 of the valve and the rotary plug 2 already participates in the compression of the radial lip 4 '.
  • the empty space 7 traversed by the fluid also makes it possible in this case to equalize and distribute the pressure (FIG. 3).
  • the seal 1 according to the invention is characterized in that it has precisely an elastic prestressing means 6 situated between said flexible annular static sealing body 4 and the dynamic sealing ring 5 rigid and axially biasing these two elements 4, 5 to ensure precisely tightness, particularly in the direction of the rotary plug 2, said elastic prestressing means 6 pressing under pressure against the inner face 5 'of the rigid sealing ring 5 opposite to that in contact with the rotary plug 2 and the inner face 4 "of the radial lip 4' of the annular sealing body 4, opposite to the face coming into contact with the hollow body 3 of the valve, the thrust force produced by said spring 6 causing the spacing of these two elements s 4, 5 to ensure the aforementioned seal.
  • This seal 1 above, with or without elastic prestressing means 6, is usually mounted in a seat structure, in the form of concentric annular shoulders, constituted by said portion of the through passage.
  • This configuration of said passage portion makes it possible to house the seal 1 without substantially reducing the passage diameter of the opening (no pressure drop in the open position of the plug 2 - substantially identical passage diameters for the opening, the sealing device 1 and the opening of the plug 2) while providing a support for the elastic prestressing means 6 when present.
  • FIG. 3 shows a distribution of the rigid part and the flexible part of the seal according to the invention.
  • the seal 1 according to the invention is characterized in that it is made of a fluorinated polymer, or preferably of PTFE or a material mainly composed of PTFE known more generally under the registered trademark "Teflon” .
  • PTFE fluorinated polymer
  • Teflon a material mainly composed of PTFE known more generally under the registered trademark "Teflon” .
  • other synthetic materials usually used for the manufacture of this type of seals may also be suitable.
  • the seal 1 according to the invention is further characterized in that the dynamic sealing ring 5 has a rigid free-beveled end section intended to provide a surface 5 "of potential contact, particularly with the plug 2, of frustoconical shape, with a dynamic sealing zone located between the outer and inner edges of the bevel, and therefore between the outer and inner circular limits of said surface potential contact 5 ".
  • the minimum thickness of the rigid portion formed by the rigid dynamic sealing ring 5 is 2 mm, preferably 4 mm, and / or the maximum thickness of the flexible part formed by the body.
  • annular static seal 4 is 1 mm, preferably 0.6 mm.
  • the rigid part makes it possible in particular to avoid excessive deformation during the rotation of the plug 2.
  • the distribution of the pressure exerted advantageously makes it possible to direct said rigid portion toward said bushel 2 and the radial lip 4 ', thanks to its great flexibility, to the hollow body 3, considering an interface between the two dissociated zones.
  • the flexible portion formed by the radial lip 4 ' also makes it possible to compensate for the total height of the rigid dynamic sealing ring 5.
  • the radial lip 4 'of the annular static sealing body 4 is situated at the rear face 4 "of said body 4 and is produced by partial segmentation of an outer peripheral strip of the constituent material of the latter, so as to form an elastically deformable skirt, inclined and protruding outwardly in the absence of stress.
  • the seal 1 according to the invention is characterized in that the elastic prestressing means 6 is, when present, a compression spring, a spring known under the English name of "energizer spring Such as a finned spring or a wave spring.
  • energizer spring Such as a finned spring or a wave spring.
  • Other equivalent means for storing mechanical energy can also be envisaged.
  • Said compression spring makes it possible to spread the radial lip 4 'and to apply a contact pressure with the hollow body of said valve 3 in the flexible part. It also makes it possible to advantageously direct the rigid part towards the plug 2 in order to ensure a contact pressure with the latter and to achieve the desired sealing in a constant and reliable manner (see FIG. Otherwise, it is the fluid (liquid or gas) that exerts its own pressure on the seal 1, which is sometimes sufficient.
  • the invention further relates to a rotary valve, preferably a two-way spherical rotary ball valve 2, characterized in that it comprises a seal 1 according to the invention.
  • said rotary plug valve 2 can be adapted to different constructive variants both in terms of the shape of the plug 2 that the number of openings and the direction of fluid flow.
  • FIG. 6 is a special case of Figures 4b and 5 which show partial enlargements of the seal 1 according to the invention cut at the same place with two different flow directions of the fluids as indicated by the two arrows.
  • At least one of the openings comprises (s) a monobloc seal 1, as described above.
  • the plug 2 is a spherical plug, said valve 1 having, for example, an inlet opening and two outlet openings.
  • the valve may be structurally integrated with a functional and structural module by being mounted downstream or upstream of a water pump also incorporated in said module, and or be mounted (integrally or independently) in a cooling fluid circulation circuit of an internal combustion engine of a motor vehicle.
  • the invention therefore makes it possible to propose a seal 1 which has only one element intended to achieve the seal, namely the rigid dynamic sealing ring 5 and the radial lip 4 ', thanks to the pressure coming from the inside of the rotary plug 2.
  • the latter is, according to the invention, made in two parts: a solid part (rigid) in contact with said rotary plug 2 and a thinner part (flexible) in contact with the main body 3 of the valve in which it is mounted .
  • a resilient biasing means 6 provides an element for storing mechanical energy to separate more easily and more reliably the two aforementioned parts of said ring.
  • this element will advantageously be a spring. That said, the storage element may very well be made of an elastomeric material.
  • the seal 1 according to the invention can also be integrated with any type of adapted valve, in particular with a so-called “multichannel” valve, and typically with a two-way valve.
  • a so-called "multichannel" valve and typically with a two-way valve.
  • Such valves are particularly useful in the field of the automotive industry, in particular for application in the engine cooling system of a motor vehicle.

Abstract

The subject of the present invention is a seal (1), in particular for a rotary ball valve fitting (2). The seal (1) according to the invention is characterized in that it comprises an annular body (4) that is resilient, flexible and provided with a radial lip (4') and a rigid sealing ring (5) that are made in one piece. A further subject of the invention is a valve of the abovementioned type that is provided with a seal according to the invention.

Description

Joint d’étanchéité, notamment pour une vanne  Seal, especially for a valve
à boisseau sphérique rotatif  rotary ball
La présente invention concerne le domaine des dispositifs de régulation de la circulation de fluide, plus particulièrement les vannes proportionnelles ou fonctionnant selon le principe dit du « tout ou rien », et plus particulièrement celui des vannes à boisseau rotatif et a pour objet un joint d’étanchéité, notamment pour une telle vanne à boisseau rotatif. The present invention relates to the field of devices for regulating fluid circulation, more particularly proportional valves or operating according to the so-called "all or nothing" principle, and more particularly that of rotary ball valves and relates to a gasket. sealing, especially for such a rotary valve.
Dans de nombreuses constructions de vannes à boisseau rotatif, en particulier à boisseaux sphériques, l'un des enjeux technologiques majeurs, pour lequel il est souvent difficile de trouver une solution performante et fiable, est la réalisation de l'étanchéité au niveau des interfaces d’étanchéité entre le boisseau et le corps de vanne, plus particulièrement au niveau des ouvertures d'entrée et/ou de sortie dudit corps de vanne, souvent soumises aux pressions élevées et à la surface du boisseau.  In many constructions of rotary ball valves, in particular ball valves, one of the major technological challenges, for which it is often difficult to find a powerful and reliable solution, is the achievement of sealing at the level of the interfaces. sealing between the plug and the valve body, more particularly at the inlet and / or outlet openings of said valve body, often subjected to high pressures and the surface of the plug.
Par les documents EP 1 529 937, EP 2 052 177, US 6 499 720, DE 10 2009 014 047 et EP 2 910 826 notamment, on connaît déjà des dispositifs d'étanchéité composites permettant d'assurer une bonne étanchéité avec le boisseau du fait de la présence d'un moyen de précontrainte élastique sollicitant le moyen d'étanchéité (bague) contre le boisseau.  By documents EP 1 529 937, EP 2 052 177, US Pat. No. 6,499,720, DE 10 2009 014 047 and EP 2 910 826 in particular, composite sealing devices are already known which make it possible to ensure a good seal with the bushel of the made of the presence of a resilient biasing means urging the sealing means (ring) against the plug.
Toutefois, dans les constructions proposées, les joints employés sont toujours constitués de plusieurs parties ou éléments, en général une bague d’étanchéité en appui sur ledit boisseau, un corps d’étanchéité annulaire et une bague de renfort, ce qui multiplie de manière désavantageuse le nombre d’interfaces (et donc les risques de fuites) et complique également l’assemblage des différents composants.  However, in the proposed constructions, the joints employed always consist of several parts or elements, generally a sealing ring bearing on said plug, an annular sealing body and a reinforcing ring, which multiplies disadvantageously. the number of interfaces (and therefore the risk of leakage) and also complicates the assembly of the various components.
Il existe donc le besoin de fournir un joint d’étanchéité plus fiable qui ne nécessite pas d’opération préalable d’assemblage comme c’est le cas pour les joints d’étanchéité connus.  There is therefore the need to provide a more reliable seal that does not require prior assembly operation as is the case for known seals.
La présente invention a pour but de proposer une solution surmontant au moins une partie de ces inconvénients.  The present invention aims to propose a solution overcoming at least some of these disadvantages.
A cet effet, l'invention propose un joint d’étanchéité, en particulier pour une vanne à boisseau rotatif, de préférence pour une vanne à boisseau rotatif à au moins deux voies et avantageusement à trois voies, ledit joint d’étanchéité comportant, d'une part, un corps d’étanchéité statique annulaire souple et flexible et pourvu d'une lèvre radiale et d'autre part, une bague dynamique d'étanchéité rigide réalisée en un matériau à faible coefficient de friction, portée par ledit corps d'étanchéité statique annulaire, l'ensemble structurel formé par le corps d'étanchéité statique annulaire et la bague dynamique d'étanchéité étant arrangé avec faculté de coulissement guidé dans la portion de passage débouchante de l'ouverture concernée, la bague d’étanchéité rigide venant en appui contre ledit boisseau rotatif, et la face interne de ladite bague d’étanchéité, opposée à celle en contact avec le boisseau rotatif, venant en regard de la face interne de la lèvre radiale du corps d'étanchéité annulaire, opposée à la face venant en contact avec le corps creux de la vanne, la force de poussée produite par le fluide au niveau dudit joint d’étanchéité provoquant l’écartement de ces deux éléments en vue d’assurer l’étanchéité, joint d’étanchéité caractérisé en ce que le corps d’étanchéité statique annulaire souple, flexible et pourvu d'une lèvre radiale et la bague dynamique d'étanchéité rigide soient réalisés en une seule pièce. For this purpose, the invention proposes a seal, in particular for a rotary valve, preferably for a rotary valve with at least two channels and advantageously three-way, said seal having, on the one hand, a sealing body flexible and flexible annular static and provided with a radial lip and secondly, a rigid dynamic sealing ring made of a low friction material material, carried by said annular static sealing body, the formed structural assembly by the annular static sealing body and the dynamic sealing ring being arranged with sliding ability guided in the opening passage portion of the opening concerned, the rigid sealing ring bearing against said rotary plug, and the internal face of said sealing ring, opposite to that in contact with the rotary plug, coming opposite the inner face of the radial lip of the annular sealing body, opposite to the face coming into contact with the hollow body of the valve, the thrust force produced by the fluid at said seal causing the spacing of these two elements to ensure sealing, sealing gasket characterized in that the flexible and flexible annular static sealing body provided with a radial lip and the rigid dynamic sealing ring are made in one piece.
Elle a également pour objet une vanne à boisseau rotatif, de préférence une vanne à boisseau rotatif sphérique à deux voies, caractérisée en ce qu’elle comprend un joint d’étanchéité selon l'invention, un corps de vanne définissant une chambre de réception et une vanne à boisseau reçue dans la chambre de réception dudit corps de vanne caractérisée en ce qu’elle comprend un joint d’étanchéité également selon l'invention.  It also relates to a rotary valve, preferably a two-way spherical rotary ball valve, characterized in that it comprises a seal according to the invention, a valve body defining a receiving chamber and a ball valve received in the receiving chamber of said valve body characterized in that it comprises a seal also according to the invention.
L'invention sera mieux comprise, grâce à la description ci- après, qui se rapporte à des modes de réalisation préférés, donnés à titre d'exemples non limitatifs, et expliqués avec référence aux dessins schématiques annexés, dans lesquels :  The invention will be better understood, thanks to the following description, which relates to preferred embodiments, given by way of non-limiting examples, and explained with reference to the attached schematic drawings, in which:
La figure 1 représente, de façon simplifiée, schématique et en coupe, une vanne à boisseau sphérique à une entrée et une sortie (vanne dite à deux voies), pourvu d'un joint d'étanchéité selon l'invention, dans une position suggérée fermée ;  FIG. 1 schematically and schematically shows in section a ball valve with an inlet and an outlet (so-called two-way valve), provided with a seal according to the invention, in a suggested position. closed;
La figure 2 est une vue partielle agrandie de la région en pointillés de la figure 1 ;  Fig. 2 is an enlarged partial view of the dotted region of Fig. 1;
La figure 3 est une vue à une échelle différente du joint d’étanchéité selon l’invention de la figure 2 expliquant de façon schématique le fonctionnement de ce dernier avec une illustration symbolique des pressions appliquées ; Les figures 4a et 4b montrent respectivement une vue en perspective d’une vanne à boisseau à trois voies complète avec sa plaque de fixation et son actionneur électrique ou motoréducteur, par exemple pour un véhicule automobile et une vue en perspective et en coupe selon un plan vertical passant par le centre de la vanne de la figure 4a ; Figure 3 is a view to a different scale of the gasket according to the invention of Figure 2 explaining schematically the operation of the latter with a symbolic illustration of the applied pressures; FIGS. 4a and 4b respectively show a perspective view of a three-way ball valve complete with its fixing plate and its electric actuator or geared motor, for example for a motor vehicle and a perspective view in section along a plane. vertical passing through the center of the valve of Figure 4a;
La figure 5 montre une vue simplifiée très fortement agrandie de la zone active du joint selon l’invention ; et  Figure 5 shows a simplified greatly enlarged view of the active area of the seal according to the invention; and
La figure 6 montre une vue simplifiée très fortement agrandie de la zone active d’un joint inversé selon l’invention pour une variante où le sens d’écoulement du fluide est inversé.  FIG. 6 shows a greatly enlarged simplified view of the active zone of an inverted seal according to the invention for a variant in which the flow direction of the fluid is reversed.
Les figures 1 à 3 illustrent un joint d’étanchéité 1 utilisé, à titre d’exemple préférentiel, dans une vanne à boisseau rotatif 2 classique, telle qu’on la trouve par exemple dans le domaine de l’industrie automobile. Une telle vanne comporte plusieurs ouvertures et au moins une ouverture d’entrée et une ouverture de sortie de fluide. A titre d'exemple, le boisseau 2 peut être réalisé par moulage d'un matériau thermoplastique, par exemple du PPS (polyphénylène sulfide).  Figures 1 to 3 illustrate a seal 1 used, by way of preferred example, in a conventional rotary valve 2, as found for example in the field of the automotive industry. Such a valve has a plurality of openings and at least one inlet opening and one fluid outlet opening. By way of example, the plug 2 may be made by molding a thermoplastic material, for example PPS (polyphenylene sulfide).
Une telle vanne, représentée de façon schématique à la figure 1, présente ici une entrée de fluide, un boisseau 2 et une sortie de fluide.  Such a valve, shown schematically in Figure 1, here has a fluid inlet, a plug 2 and a fluid outlet.
Elle comprend également un corps de vanne creux 3, muni d'au moins une ouverture d'entrée et d'au moins une ouverture de sortie et définissant une chambre de réception pour ledit boisseau 2, ce dernier présentant une surface extérieure sphérique, au moins au niveau de la ou des portion(s) de surface extérieure venant en regard de la ou des ouverture(s) dans l'une quelconque des positions rotatoires possibles dudit boisseau 2.  It also comprises a hollow valve body 3, provided with at least one inlet opening and at least one outlet opening and defining a receiving chamber for said plug 2, the latter having a spherical outer surface, at least at the portion or portions of the outer surface facing the aperture (s) in any one of the possible rotational positions of said plug (2).
Ladite vanne comporte également au moins un dispositif ou joint d'étanchéité 1 réalisé, conformément à la présente invention, de façon monobloc, c’est-à-dire d’une seule pièce, installé coaxialement dans une portion de passage interne débouchante d’au moins une des ouvertures et comprenant, d'une part, un corps annulaire pourvu d'une lèvre radiale 4' souple réalisant une étanchéité contre la face interne de la portion de passage, d'autre part, une bague d'étanchéité 5 réalisée en un matériau à faible coefficient de friction, portée par le corps d'étanchéité annulaire et destinée à venir en appui étanche sur la surface extérieure du boisseau 2, et, enfin, un moyen de précontrainte élastique 6 sollicitant axialement ledit corps d'étanchéité annulaire en direction du boisseau 2, l'ensemble structurel formé par ledit corps d'étanchéité annulaire et ladite bague d'étanchéité étant arrangé avec faculté de coulissement guidé dans la portion de passage débouchante de l'ouverture concernée. Said valve also comprises at least one device or seal 1 made, in accordance with the present invention, integrally, that is to say in one piece, installed coaxially in a portion of internal passage passing through at least one of the openings and comprising, on the one hand, an annular body provided with a flexible radial lip 4 'sealing against the inner face of the passage portion, on the other hand, a sealing ring 5 made in a material with a low coefficient of friction, carried by the annular sealing body and intended to bear tightly against the outer surface of the plug 2, and finally, an elastic prestressing means 6 axially biasing said annular sealing body towards the bushel 2, the whole structural member formed by said annular sealing body and said sealing ring being slidably arranged guided in the passage portion opening of the opening concerned.
Selon un autre mode de réalisation également préféré et avantageux ledit joint d’étanchéité 1 selon l’invention, en particulier pour une vanne à boisseau rotatif, de préférence pour une vanne à boisseau rotatif à deux voies, se distingue en ce qu’il comporte, d'une part, un corps d’étanchéité statique annulaire 4 souple et flexible et pourvu d'une lèvre radiale 4' et d'autre part, une bague dynamique d'étanchéité 5 rigide réalisée en un matériau à faible coefficient de friction, portée par ledit corps d'étanchéité statique annulaire 4, l'ensemble structurel formé par le corps d'étanchéité statique annulaire 4 et la bague dynamique d'étanchéité 5 étant arrangé avec faculté de coulissement guidé dans la portion de passage débouchant de l'ouverture concernée, la bague d’étanchéité 5 rigide venant en appui contre ledit boisseau 2, et la face interne 5’ de ladite bague d’étanchéité, opposée à celle en contact avec le boisseau rotatif 2, venant en regard de la face interne 4” de la lèvre radiale 4’ du corps d'étanchéité annulaire 4, opposée à la face venant en contact avec le corps creux 3 de la vanne, la force de poussée produite par le fluide au niveau dudit joint d’étanchéité 4 provoquant l’écartement de ces deux éléments 4, 5 en vue d’assurer l’étanchéité. Ce joint sans élément de précontrainte élastique 6 et donc plus simple et moins cher à fabriquer est également caractérisé en ce que le corps d’étanchéité statique annulaire 4 souple, flexible et pourvu d'une lèvre radiale 4’ et la bague dynamique d'étanchéité 5 rigide soient réalisés en une seule pièce.  According to another embodiment also preferred and advantageous said seal 1 according to the invention, in particular for a rotary valve, preferably for a two-way rotary valve, is distinguished in that it comprises on the one hand, a flexible and flexible annular sealing body 4 provided with a radial lip 4 'and, on the other hand, a rigid dynamic sealing ring 5 made of a material with a low coefficient of friction, carried by said annular static sealing body 4, the structural assembly formed by the annular static sealing body 4 and the dynamic sealing ring 5 being arranged with sliding ability guided in the passage portion opening out of the opening concerned, the rigid sealing ring 5 bearing against said plug 2, and the inner face 5 'of said sealing ring, opposite that in contact with the bushel ro 2, coming opposite the inner face 4 "of the radial lip 4 'of the annular sealing body 4, opposite the face coming into contact with the hollow body 3 of the valve, the thrust force produced by the fluid at the level of said seal 4 causing the spacing of these two elements 4, 5 to ensure sealing. This seal without elastic prestressing element 6 and therefore simpler and cheaper to manufacture is also characterized in that the flexible and flexible annular sealing body 4 provided with a radial lip 4 'and the dynamic sealing ring 5 rigid are made in one piece.
Selon la direction de propagation du fluide à l’intérieur de la vanne et donc du joint 1, la pression exercée par ledit fluide provoque un écartement des deux éléments 4, 5 en vue de garantir l’étanchéité du montage. En effet, la pression du fluide qui s’infiltre entre le corps creux 3 de la vanne et le boisseau rotatif 2 participe déjà à la compression de la lèvre radiale 4’. L’espace vide 7 parcouru par le fluide permet également dans ce cas à un équilibrage et une répartition de la pression (figure 3). On pourra avantageusement jouer sur le volume de cet espace vide 7, par exemple avec un évidement profond, et/ou les propriétés élastiques des matériaux formant les éléments 4, 5 et/ou la force du moyen de précontrainte élastique 6 pour configurer le joint d’étanchéité selon les spécificités requises. Pour le reste, on pourra se référer à l’exemple donné dans lequel un moyen de précontrainte élastique 6 est prévu. According to the direction of propagation of the fluid inside the valve and thus the seal 1, the pressure exerted by said fluid causes a spacing of the two elements 4, 5 to ensure the tightness of the assembly. Indeed, the pressure of the fluid which infiltrates between the hollow body 3 of the valve and the rotary plug 2 already participates in the compression of the radial lip 4 '. The empty space 7 traversed by the fluid also makes it possible in this case to equalize and distribute the pressure (FIG. 3). We can advantageously play on the volume of this empty space 7, for example with a deep recess, and / or the elastic properties of the materials forming the elements 4, 5 and / or the force of the elastic prestressing means 6 to configure the gasket. sealing according to the specific requirements. For the rest, it will be possible to refer to the example given in which an elastic prestressing means 6 is provided.
Dans cette variante plus sophistiquée mais plus performante en termes d’efficacité d’étanchéité et/ou de fiabilité, on prévoit que le joint d’étanchéité 1 selon l'invention est caractérisé en ce qu’il présente justement un moyen de précontrainte élastique 6 situé entre ledit corps d’étanchéité statique annulaire 4 souple et la bague dynamique d’étanchéité 5 rigide et sollicitant axialement ces deux éléments 4, 5 pour assurer précisément l’étanchéité, notamment en direction du boisseau rotatif 2, ledit moyen de précontrainte élastique 6 venant en appui sous pression contre la face interne 5’ de la bague d’étanchéité 5 rigide, opposée à celle en contact avec le boisseau rotatif 2 et la face interne 4” de la lèvre radiale 4’ du corps d'étanchéité annulaire 4, opposée à la face venant en contact avec le corps creux 3 de la vanne, la force de poussée produite par ledit ressort 6 provoquant l’écartement de ces deux éléments 4, 5 en vue d’assurer l’étanchéité susvisée.  In this variant more sophisticated but more efficient in terms of sealing efficiency and / or reliability, it is expected that the seal 1 according to the invention is characterized in that it has precisely an elastic prestressing means 6 situated between said flexible annular static sealing body 4 and the dynamic sealing ring 5 rigid and axially biasing these two elements 4, 5 to ensure precisely tightness, particularly in the direction of the rotary plug 2, said elastic prestressing means 6 pressing under pressure against the inner face 5 'of the rigid sealing ring 5 opposite to that in contact with the rotary plug 2 and the inner face 4 "of the radial lip 4' of the annular sealing body 4, opposite to the face coming into contact with the hollow body 3 of the valve, the thrust force produced by said spring 6 causing the spacing of these two elements s 4, 5 to ensure the aforementioned seal.
Ce joint d'étanchéité 1 précité, avec ou sans moyen de précontrainte élastique 6, est habituellement monté dans une structure de siège, sous forme d'épaulements annulaires concentriques, constituée par ladite portion de passage interne débouchante. Cette configuration de ladite portion de passage permet de loger le joint d'étanchéité 1 sans réduire sensiblement le diamètre de passage de l'ouverture (pas de perte de charge en position ouverte du boisseau 2 - diamètres de passage sensiblement identiques pour l'ouverture, le dispositif d’étanchéité 1 et l'ouverture du boisseau 2) tout en fournissant un appui pour le moyen de précontrainte élastique 6 lorsqu’il est présent.  This seal 1 above, with or without elastic prestressing means 6, is usually mounted in a seat structure, in the form of concentric annular shoulders, constituted by said portion of the through passage. This configuration of said passage portion makes it possible to house the seal 1 without substantially reducing the passage diameter of the opening (no pressure drop in the open position of the plug 2 - substantially identical passage diameters for the opening, the sealing device 1 and the opening of the plug 2) while providing a support for the elastic prestressing means 6 when present.
A titre d’exemple, la figure 3, montre une répartition de la partie rigide et de la partie souple du joint d’étanchéité selon l’invention.  By way of example, FIG. 3 shows a distribution of the rigid part and the flexible part of the seal according to the invention.
Avantageusement, le joint d’étanchéité 1 selon l’invention, est caractérisé en ce qu’il est réalisé en un polymère fluoré, ou préférentiellement en PTFE ou en un matériau composé en majorité de PTFE connu plus généralement sous la marque déposée « Téflon ». Bien entendu, d’autres matières synthétiques habituellement utilisées pour la fabrication de ce type de joints d’étanchéité peuvent également convenir.  Advantageously, the seal 1 according to the invention is characterized in that it is made of a fluorinated polymer, or preferably of PTFE or a material mainly composed of PTFE known more generally under the registered trademark "Teflon" . Of course, other synthetic materials usually used for the manufacture of this type of seals may also be suitable.
Selon une caractéristique avantageuse, le joint d’étanchéité 1 selon l’invention, est encore caractérisé en ce que la bague dynamique d'étanchéité 5 rigide présente en section une extrémité libre en biseau destinée à fournir une surface 5” de contact potentiel, notamment avec le boisseau 2, de forme tronconique, avec une zone d'étanchéité dynamique située entre les bords externe et interne du biseau, et donc entre les limites circulaires externe et interne de ladite surface de contact potentiel 5”. According to an advantageous characteristic, the seal 1 according to the invention is further characterized in that the dynamic sealing ring 5 has a rigid free-beveled end section intended to provide a surface 5 "of potential contact, particularly with the plug 2, of frustoconical shape, with a dynamic sealing zone located between the outer and inner edges of the bevel, and therefore between the outer and inner circular limits of said surface potential contact 5 ".
Selon d’autres caractéristiques avantageuses, l’épaisseur minimale de la partie rigide formée par la bague dynamique d’étanchéité 5 rigide est de 2 mm, préférentiellement de 4 mm et/ou l’épaisseur maximale de la partie souple formée par le corps d’étanchéité statique annulaire 4 est de 1 mm, préférentiellement de 0,6 mm.  According to other advantageous features, the minimum thickness of the rigid portion formed by the rigid dynamic sealing ring 5 is 2 mm, preferably 4 mm, and / or the maximum thickness of the flexible part formed by the body. annular static seal 4 is 1 mm, preferably 0.6 mm.
Ainsi, et comme schématiquement illustré par les flèches sur la figure 3, la partie rigide permet notamment d’éviter une déformation trop importante durant la rotation du boisseau 2. De même la répartition de la pression exercée permet avantageusement de diriger ladite partie rigide vers ledit boisseau 2 et la lèvre radiale 4’, grâce à sa grande souplesse relative, vers le corps creux 3, en considérant une interface entre les deux zones dissociées.  Thus, and as schematically illustrated by the arrows in FIG. 3, the rigid part makes it possible in particular to avoid excessive deformation during the rotation of the plug 2. Similarly, the distribution of the pressure exerted advantageously makes it possible to direct said rigid portion toward said bushel 2 and the radial lip 4 ', thanks to its great flexibility, to the hollow body 3, considering an interface between the two dissociated zones.
La partie souple formée par la lèvre radiale 4’ permet en outre de compenser la hauteur totale de la bague dynamique d’étanchéité 5 rigide.  The flexible portion formed by the radial lip 4 'also makes it possible to compensate for the total height of the rigid dynamic sealing ring 5.
De manière surprenante, les meilleurs résultats en termes d’efficacité et de rentabilité sont obtenus lorsque le rapport entre l’épaisseur minimale de la partie rigide formée par la bague dynamique d’étanchéité 5 rigide et l’épaisseur maximale de la partie souple formée par le corps d’étanchéité statique annulaire 4 est compris entre 2 et 10.  Surprisingly, the best results in terms of efficiency and cost-effectiveness are obtained when the ratio between the minimum thickness of the rigid part formed by the rigid dynamic sealing ring 5 and the maximum thickness of the flexible part formed by the annular static sealing body 4 is between 2 and 10.
Selon un autre aspect de l’invention, la lèvre radiale 4’ du corps d'étanchéité statique annulaire 4 est située au niveau de la face arrière 4” dudit corps 4 et est réalisée par segmentation partielle d'une bande périphérique extérieure du matériau constitutif de ce dernier, de manière à former une jupe déformable élastiquement, inclinée et proéminente vers l'extérieur en l'absence de contrainte.  According to another aspect of the invention, the radial lip 4 'of the annular static sealing body 4 is situated at the rear face 4 "of said body 4 and is produced by partial segmentation of an outer peripheral strip of the constituent material of the latter, so as to form an elastically deformable skirt, inclined and protruding outwardly in the absence of stress.
De manière préférée, le joint d’étanchéité 1 selon l'invention, est caractérisé en ce que le moyen de précontrainte élastique 6 est, lorsqu’il est présent, un ressort de compression, un ressort connu sous la dénomination anglaise de « energizer spring » tel qu’un ressort à ailettes ou un ressort à vagues. D’autres moyens équivalents de stockage d’énergie mécanique sont également envisageables.  Preferably, the seal 1 according to the invention is characterized in that the elastic prestressing means 6 is, when present, a compression spring, a spring known under the English name of "energizer spring Such as a finned spring or a wave spring. Other equivalent means for storing mechanical energy can also be envisaged.
Ledit ressort de compression (ou équivalent) permet d’écarter la lèvre radiale 4’ et d’appliquer une pression de contact avec le corps creux de vanne 3 précité dans la partie souple. Il permet également de diriger avantageusement la partie rigide vers le boisseau 2 afin d’assurer une pression de contact avec ce dernier et de réaliser l’étanchéité souhaitée de façon constante et fiable (cf. figure 3). Sinon, c’est le fluide (liquide ou gaz) qui exerce sa propre pression sur le joint d’étanchéité 1, ce qui est parfois suffisant. Said compression spring (or equivalent) makes it possible to spread the radial lip 4 'and to apply a contact pressure with the hollow body of said valve 3 in the flexible part. It also makes it possible to advantageously direct the rigid part towards the plug 2 in order to ensure a contact pressure with the latter and to achieve the desired sealing in a constant and reliable manner (see FIG. Otherwise, it is the fluid (liquid or gas) that exerts its own pressure on the seal 1, which is sometimes sufficient.
L’invention a encore pour objet une vanne à boisseau rotatif, de préférence une vanne à boisseau rotatif sphérique 2 à deux voies, caractérisé en ce qu’elle comprend un joint d’étanchéité 1 selon l'invention.  The invention further relates to a rotary valve, preferably a two-way spherical rotary ball valve 2, characterized in that it comprises a seal 1 according to the invention.
Enfin, ladite vanne à boisseau rotatif 2 peut être déclinée selon différentes variantes constructives tant au niveau de la forme du boisseau 2 que du nombre d'ouvertures et du sens de circulation du fluide.  Finally, said rotary plug valve 2 can be adapted to different constructive variants both in terms of the shape of the plug 2 that the number of openings and the direction of fluid flow.
Dans un autre mode de réalisation de l’invention dans lequel le fluide circule de l’extérieur vers l’intérieur du boisseau, le joint est inversé comme sur la figure 6, de sorte que le fluide (cf. flèches) participe à la compression de la lèvre flexible du joint d’étanchéité. La figure 6 est donc un cas particulier des figures 4b et 5 qui représentent des agrandissements partiels du joint d’étanchéité 1 selon l’invention coupés au même endroit avec deux sens d’écoulements des fluides différents comme indiqué par les deux flèches.  In another embodiment of the invention in which the fluid flows from the outside to the inside of the plug, the seal is reversed as in FIG. 6, so that the fluid (see arrows) participates in the compression the flexible lip of the seal. Figure 6 is a special case of Figures 4b and 5 which show partial enlargements of the seal 1 according to the invention cut at the same place with two different flow directions of the fluids as indicated by the two arrows.
Dans toutes les variantes de réalisation de l'invention néanmoins, au moins l'une des ouvertures, préférentiellement toutes les ouvertures, comporte(nt) un joint d'étanchéité 1 monobloc, comme décrit précédemment.  In all the embodiments of the invention, however, at least one of the openings, preferably all the openings, comprises (s) a monobloc seal 1, as described above.
Comme évoqué, dans le cadre des différentes variantes constructives, il peut notamment être prévu que le boisseau 2 soit un boisseau sphérique, ladite vanne 1 présentant, par exemple, une ouverture d'entrée et deux ouvertures de sortie.  As mentioned, in the context of the various constructional variants, it can in particular be provided that the plug 2 is a spherical plug, said valve 1 having, for example, an inlet opening and two outlet openings.
En relation avec une application préférée de la vanne à boisseau 2 selon l'invention, la vanne peut être intégrée structurellement à un module fonctionnel et structurel en étant montée en aval ou en amont d'une pompe à eau également incorporée audit module, et/ou être montée (de manière intégrée ou indépendante) dans un circuit de circulation de fluide de refroidissement d'un moteur à combustion interne d’un véhicule automobile.  In connection with a preferred application of the plug valve 2 according to the invention, the valve may be structurally integrated with a functional and structural module by being mounted downstream or upstream of a water pump also incorporated in said module, and or be mounted (integrally or independently) in a cooling fluid circulation circuit of an internal combustion engine of a motor vehicle.
L'invention permet donc de proposer un joint d’étanchéité 1 qui ne présente qu’un seul élément destiné à réaliser l’étanchéité, à savoir la bague dynamique d’étanchéité rigide 5 et la lèvre radiale 4’, ce grâce à la pression provenant de l’intérieur du boisseau rotatif 2. The invention therefore makes it possible to propose a seal 1 which has only one element intended to achieve the seal, namely the rigid dynamic sealing ring 5 and the radial lip 4 ', thanks to the pressure coming from the inside of the rotary plug 2.
Cette dernière est, selon l’invention, réalisée en deux parties : une partie massive (rigide) en contact avec ledit boisseau rotatif 2 et une partie plus fine (souple) en contact avec le corps 3 principal de la vanne dans laquelle elle est montée.  The latter is, according to the invention, made in two parts: a solid part (rigid) in contact with said rotary plug 2 and a thinner part (flexible) in contact with the main body 3 of the valve in which it is mounted .
L’ajout d’un moyen de précontrainte élastique 6 procure un élément permettant de stocker une énergie mécanique afin d’écarter plus facilement et de manière plus fiable les deux parties précitées de ladite bague.  The addition of a resilient biasing means 6 provides an element for storing mechanical energy to separate more easily and more reliably the two aforementioned parts of said ring.
Comme indiqué plus haut, cet élément sera avantageusement un ressort. Cela dit, l’élément de stockage peut très bien être réalisé en une matière élastomère.  As indicated above, this element will advantageously be a spring. That said, the storage element may very well be made of an elastomeric material.
De façon particulièrement intéressante, le joint d’étanchéité 1 selon l’invention peut également être intégré à tout type de vanne adapté, en particulier à une vanne dite « multivoies », et typiquement à une vanne à deux voies. De telles vannes sont particulièrement utiles dans le domaine de l’industrie automobile, en particulier pour une application dans le circuit de refroidissement moteur d’un véhicule automobile.  In a particularly interesting way, the seal 1 according to the invention can also be integrated with any type of adapted valve, in particular with a so-called "multichannel" valve, and typically with a two-way valve. Such valves are particularly useful in the field of the automotive industry, in particular for application in the engine cooling system of a motor vehicle.
Bien entendu, l'invention n'est pas limitée aux modes de réalisation décrits et représentés aux dessins annexés. Des modifications restent possibles, notamment du point de vue de la constitution des divers éléments ou par substitution d'équivalents techniques, sans sortir pour autant du domaine de protection de l'invention.  Of course, the invention is not limited to the embodiments described and shown in the accompanying drawings. Modifications are possible, particularly from the point of view of the constitution of the various elements or by substitution of technical equivalents, without departing from the scope of protection of the invention.

Claims

RE VENDIC ATIONS RE VENDIC ATIONS
1) Joint d’étanchéité (1), en particulier pour une vanne à boisseau rotatif (2), de préférence pour une vanne à boisseau rotatif (2) à au moins deux voies, 1) Seal (1), in particular for a rotary valve (2), preferably for a rotary valve (2) with at least two channels,
ledit joint d’étanchéité (1) comportant, d'une part, un corps d’étanchéité statique annulaire (4) souple et flexible et pourvu d'une lèvre radiale (4') et d'autre part, une bague dynamique d'étanchéité (5) rigide réalisée en un matériau à faible coefficient de friction, portée par ledit corps d'étanchéité statique annulaire (4),  said seal (1) comprising, on the one hand, a flexible and flexible annular sealing body (4) provided with a radial lip (4 ') and, on the other hand, a dynamic ring of rigid seal (5) made of a low friction material carried by said annular static sealing body (4),
l'ensemble structurel formé par le corps d'étanchéité statique annulaire (4) et la bague dynamique d'étanchéité (5) rigide étant arrangé avec faculté de coulissement guidé dans la portion de passage débouchante de l'ouverture concernée, la bague d’étanchéité (5) rigide venant en appui contre ledit boisseau rotatif (2), et  the structural assembly formed by the annular static sealing body (4) and the rigid dynamic sealing ring (5) being arranged with sliding ability guided in the opening passage portion of the opening concerned, the ring of rigid seal (5) bearing against said rotary plug (2), and
la face interne (5’) de ladite bague d’étanchéité (5) rigide, opposée à celle en contact avec le boisseau rotatif (2), venant en regard de la face interne (4”) de la lèvre radiale (4’) du corps d'étanchéité annulaire (4), opposée à la face venant en contact avec le corps creux (3) de la vanne, la force de poussée produite par le fluide au niveau dudit joint d’étanchéité (4) provoquant l’écartement de ces deux éléments (4, 5) en vue d’assurer l’étanchéité,  the inner face (5 ') of said rigid sealing ring (5), opposite to that in contact with the rotary plug (2), facing the internal face (4 ") of the radial lip (4') of the annular sealing body (4), opposite to the face coming into contact with the hollow body (3) of the valve, the thrust force produced by the fluid at the level of said seal (4) causing the spacing of these two elements (4, 5) to ensure sealing,
joint d’étanchéité (1) caractérisé en ce que le corps d’étanchéité statique annulaire (4) souple, flexible et pourvu d'une lèvre radiale (4’) et la bague dynamique d'étanchéité (5) rigide soient réalisés en une seule pièce.  sealing ring (1) characterized in that the flexible and flexible annular sealing body (4) provided with a radial lip (4 ') and the rigid sealing dynamic ring (5) are made in one single piece.
2) Joint d’étanchéité (1) selon la revendication 1, caractérisé en ce qu’il est réalisé en un polymère fluoré, en PTFE ou en un matériau composé en majorité de PTFE.  2) Seal (1) according to claim 1, characterized in that it is made of a fluoropolymer, PTFE or a material composed mainly of PTFE.
3) Joint d’étanchéité (1) selon la revendication 1 ou 2, caractérisé en ce que la bague dynamique d'étanchéité (5) rigide présente en section une extrémité libre en biseau destinée à fournir une surface (5") de contact potentiel, notamment avec le boisseau (2), de forme tronconique, avec une zone d'étanchéité dynamique située entre les bords externe et interne du biseau, et donc entre les limites circulaires externe et interne de ladite surface de contact potentiel (5"). 4) Joint d’étanchéité (1) selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l’épaisseur minimale de la partie rigide formée par la bague dynamique d’étanchéité (5) rigide est de 2 mm. 3) Seal (1) according to claim 1 or 2, characterized in that the dynamic sealing ring (5) has a cross sectional free end beveled to provide a surface (5 ") of potential contact , especially with the plug (2), of frustoconical shape, with a dynamic sealing zone located between the outer and inner edges of the bevel, and therefore between the outer and inner circular boundaries of said potential contact surface (5 "). 4) Seal (1) according to any one of claims 1 to 3, characterized in that the minimum thickness of the rigid portion formed by the dynamic sealing ring (5) is rigid 2 mm.
5) Joint d’étanchéité (1) selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l’épaisseur maximale de la partie souple formée par le corps d’étanchéité statique annulaire (4) est de 1 mm.  5) Seal (1) according to any one of claims 1 to 3, characterized in that the maximum thickness of the flexible portion formed by the annular static sealing body (4) is 1 mm.
6) Joint d’étanchéité (1) selon l'une quelconque des revendications 1 à 5, caractérisé en ce que le rapport entre l’épaisseur minimale de la partie rigide formée par la bague dynamique d’étanchéité (5) rigide et l’épaisseur maximale de la partie souple formée par le corps d’étanchéité statique annulaire (4) est compris entre 2 et 10.  6) Seal (1) according to any one of claims 1 to 5, characterized in that the ratio between the minimum thickness of the rigid portion formed by the dynamic sealing ring (5) rigid and the maximum thickness of the flexible part formed by the annular static sealing body (4) is between 2 and 10.
7) Joint d’étanchéité (1) selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la lèvre radiale (4') du corps d'étanchéité statique annulaire (4) est située au niveau de la face arrière (4") dudit corps (4) et est réalisée par segmentation partielle d'une bande périphérique extérieure du matériau constitutif de ce dernier, de manière à former une jupe déformable élastiquement, inclinée et proéminente vers l'extérieur en l'absence de contrainte.  7) Seal (1) according to any one of claims 1 to 6, characterized in that the radial lip (4 ') of the annular static sealing body (4) is located at the rear face ( 4 ") of said body (4) and is made by partial segmentation of an outer peripheral band of the material constituting the latter, so as to form an elastically deformable skirt, inclined and protruding outwardly in the absence of stress.
8) Joint d’étanchéité (1) selon l'une quelconque des revendications 1 à 7, caractérisé en ce qu’il présente un moyen de précontrainte élastique (6) situé entre ledit corps d’étanchéité statique annulaire (4) souple et la bague dynamique d’étanchéité (5) rigide et sollicitant axialement ces deux éléments (4, 5) pour assurer l’étanchéité, notamment en direction du boisseau rotatif (2), ledit moyen de précontrainte élastique (6) venant en appui sous pression contre la face interne (5’) de la bague d’étanchéité (5) rigide, opposée à celle en contact avec le boisseau rotatif (2) et la face interne (4”) de la lèvre radiale (4’) du corps d'étanchéité annulaire (4), opposée à la face venant en contact avec le corps creux (3) de la vanne, la force de poussée produite par ledit ressort (6) provoquant l’écartement de ces deux éléments (4, 5) en vue d’assurer l’étanchéité.  8) Seal (1) according to any one of claims 1 to 7, characterized in that it has an elastic prestressing means (6) between said flexible annular sealing body (4) and the flexible dynamic sealing ring (5) rigid and axially biasing these two elements (4, 5) to ensure sealing, in particular in the direction of the rotary plug (2), said elastic prestressing means (6) pressing against pressure against the inner face (5 ') of the rigid sealing ring (5), opposite to that in contact with the rotary plug (2) and the inner face (4 ") of the radial lip (4') of the body of annular seal (4), opposite to the face coming into contact with the hollow body (3) of the valve, the thrust force produced by said spring (6) causing the spacing of these two elements (4, 5) in order to to seal.
9) Joint d’étanchéité (1) selon la revendication 8, caractérisé en ce que le moyen de précontrainte élastique (6) est un ressort de compression.  9) seal (1) according to claim 8, characterized in that the elastic prestressing means (6) is a compression spring.
10) Joint d’étanchéité (1) selon la revendication 8, caractérisé en ce que le moyen de précontrainte élastique (6) est un ressort à vagues. 11) Joint d’étanchéité (1) selon la revendication 8, caractérisé en ce que le moyen de précontrainte élastique (6) est un ressort à ailettes connu sous la désignation anglaise de « energizer spring ». 10) Seal (1) according to claim 8, characterized in that the elastic prestressing means (6) is a wave spring. 11) Seal (1) according to claim 8, characterized in that the elastic prestressing means (6) is a finned spring known under the English name "energizer spring".
12) Vanne à boisseau rotatif, de préférence vanne à boisseau rotatif sphérique (2) à deux voies, caractérisée en ce qu’elle comprend un joint d’étanchéité (1) selon l'une quelconque des revendications 1 à 11.  12) Rotary ball valve, preferably spherical rotary ball valve (2) with two channels, characterized in that it comprises a seal (1) according to any one of claims 1 to 11.
EP19723435.4A 2018-05-18 2019-05-16 Seal, in particular for a rotary ball valve fitting Withdrawn EP3794253A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1854152A FR3081200B1 (en) 2018-05-18 2018-05-18 SEAL, ESPECIALLY FOR A ROTARY BALL VALVE
PCT/EP2019/062612 WO2019219807A1 (en) 2018-05-18 2019-05-16 Seal, in particular for a rotary ball valve fitting

Publications (1)

Publication Number Publication Date
EP3794253A1 true EP3794253A1 (en) 2021-03-24

Family

ID=62751173

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19723435.4A Withdrawn EP3794253A1 (en) 2018-05-18 2019-05-16 Seal, in particular for a rotary ball valve fitting

Country Status (5)

Country Link
US (1) US11466779B2 (en)
EP (1) EP3794253A1 (en)
CN (1) CN112368496B (en)
FR (1) FR3081200B1 (en)
WO (1) WO2019219807A1 (en)

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CN112343924A (en) * 2020-10-29 2021-02-09 广州市昊志机电股份有限公司 Main shaft contact type sealing structure, main shaft and machine tool

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Also Published As

Publication number Publication date
FR3081200B1 (en) 2021-07-23
US11466779B2 (en) 2022-10-11
CN112368496B (en) 2023-03-28
CN112368496A (en) 2021-02-12
WO2019219807A1 (en) 2019-11-21
US20210254717A1 (en) 2021-08-19
FR3081200A1 (en) 2019-11-22

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