WO2005059424A1 - Raccord resistant a la corrosion pour tuyaux a couches multiples - Google Patents

Raccord resistant a la corrosion pour tuyaux a couches multiples Download PDF

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Publication number
WO2005059424A1
WO2005059424A1 PCT/IB2004/004102 IB2004004102W WO2005059424A1 WO 2005059424 A1 WO2005059424 A1 WO 2005059424A1 IB 2004004102 W IB2004004102 W IB 2004004102W WO 2005059424 A1 WO2005059424 A1 WO 2005059424A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipe
fitting
bushing
terminal
sleeve
Prior art date
Application number
PCT/IB2004/004102
Other languages
English (en)
Inventor
Ciro Mastromatteo
Original Assignee
Tapel Di Mastromatteo Ciro & C. S.A.S
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 Tapel Di Mastromatteo Ciro & C. S.A.S filed Critical Tapel Di Mastromatteo Ciro & C. S.A.S
Priority to EP04806336A priority Critical patent/EP1697673A1/fr
Publication of WO2005059424A1 publication Critical patent/WO2005059424A1/fr

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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L25/00—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means
    • F16L25/02—Electrically insulating joints or couplings
    • F16L25/023—Electrically insulating joints or couplings for joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • 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
    • F16L33/22—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses with means not mentioned in the preceding groups for gripping the hose between inner and outer parts
    • F16L33/223—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses with means not mentioned in the preceding groups for gripping the hose between inner and outer parts the sealing surfaces being pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • F16L33/224—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses with means not mentioned in the preceding groups for gripping the hose between inner and outer parts the sealing surfaces being pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts a clamping ring being arranged between the threaded member and the connecting member

Definitions

  • the present invention is generally applicable in the technical filed of the heating and hydraulic plants and particularly relates to a pipe fitting of the type described in the preamble of claim 1.
  • junction devices for connecting together multilayer pipes and threaded terminals of hydraulic plants or apparatus such as radiators or boilers.
  • a frequently used junction device includes a metal core which is integral with the terminal and is adapted to be introduced in a longitudinal end of the multilayer pipe, and an outer cylindrical portion adapted to enclose the same end of the pipe.
  • the core generally has one or more external O-rings, whereas the outer cylindrical portion is plastically deformed by compression upon mounting thereof, to fasten the pipe on the terminal.
  • US-A-3980325 discloses a device for connecting the longitudinal end of a flexible pipe and an externally threaded terminal having a male •member adapted to be inserted in the pipe.
  • the device comprises a hollow nut designed to be tightened on the threaded terminal when the male member of the terminal is inserted in the pipe end.
  • the nut also has an inner frusto-conical portion adapted to compress a collet against the end of the pipe to clamp the latter.
  • WO-A-9801695 and EP-A-1020675 disclose similar junction devices, each comprising an inner core, with the pipe end being slipped thereon, and an external nut, designed to be tightened on a threaded terminal.
  • the nut compresses an intermediate bushing against the outer wall of the pipe and against a peripheral edge of the terminal.
  • the intermediate bushing has a cylindrical portion designed to contact the outer wall of the pipe and a front portion designed to be interposed between the peripheral edge of the terminal and the pipe.
  • An apparent drawback of this arrangement lies in that the front portion of the intermediate bushing may be deformed or displaced due to the pressure exerted by the nut, thereby increasing the risk of electrical contact between a metal layer of the pipe, if any, and the terminal, and allowing the passage of stray currents.
  • both the intermediate bushing and the inner core are made of metal, to provide high rigidity and resistance to the junction device.
  • the peripheral edge of the pipe generally abuts against a plastic washer.
  • the inner core and/or the intermediate bushing have appropriate projections to facilitate pipe clamping. Due to the clamping pressure exerted by the nut, these projections permanently deform the pipe and prevent any reuse of its end. Also, these projections may engrave the plastic surface layers of the pipe and come in contact with the metal layer thereof, thereby increasing the risk of stray currents and electro-corrosion.
  • a primary object of this invention is to obviate the above drawbacks, by providing a cost-effective fitting.
  • a particular object is to provide a fitting that can be reused several times and allow easy mounting/removal thereof.
  • An additional object of the invention is to provide a fitting that effectively prevents stray currents and is little prone to electro-corrosion.
  • Another particular object is to provide a fitting that can assure a high sealing action and does not damage the pipes to be connected.
  • Yet a further object of the invention is to provide a sturdy fitting, whose features remain unchanged with time.
  • a corrosion resistant fitting for multilayer pipes particularly for connecting an at least partly threaded metal terminal to a multilayer pipe with at least one metal layer, comprising a substantially rigid hollow sleeve, to be inserted in an end of the pipe, a clamp member having an internally threaded portion to be tightened on said terminal, an elastic bushing interposed between the clamp element and the pipe to compress the latter against the hollow sleeve and/or against the terminal upon tightening of the clamp member, electric insulating means for preventing the passage of stray currents between the pipe and the terminal, characterized in that the electric insulating means include a gasket made of an electrically insulating base material, having an axial tubular portion to be interposed between the hollow sleeve and the inner surface of the end of the pipe, and a radial portion to be interposed between the terminal and the front edge of the end of the pipe, to jointly increase both the sealing action and the
  • FIG. 1 is a sectional and partially exploded view of a first embodiment of a fitting in accordance with the invention
  • FIGS. 2, 3 and 4 are further views of the fitting of FIG. 1
  • FIG. 5 is a sectional and partially exploded view of a second embodiment of a fitting in accordance with the invention
  • FIGS. 6, 7 and 8 are further views of the fitting of FIG. 5
  • FIGS. 9 and 10 are views of a detail of the fitting of FIG. 1
  • FIG. 11 is a view of a detail of the fitting of FIG.
  • FIG. 12 is a partial view of the fitting of FIG. 5;
  • FIG. 13 is a partial view of the fitting of FIG. 1;
  • FIGS. 14 and 15 are views of another detail of a fitting according to the invention;
  • FIG. 16 is a view of a detail of the fitting of FIG. 5;
  • FIG. 17 is a view of a detail of the fitting of FIG. 1;
  • FIGS. 18 and 19 are views of another detail of a fitting according to the invention;
  • FIGS. 20 and 21 are partly sectional views of an embodiment of a detail of the fitting in accordance with the invention;
  • FIGS. 20' and 21' are enlarged views of the detail of FIGS. 20 and 21 respectively;
  • FIG. 22 is a plan view of a detail of FIGS. 20 and 21;
  • FIG. 23 is a sectional side view of a detail of FIGS. 20 and 21, as taken along a plane XXIII-XXIII.
  • Fitting 1 may be advantageously used for multilayer pipes and will be particularly effective for connecting one at least partly threaded metal terminal T to a multilayer pipe P.
  • the latter may have at least one metal, e.g. aluminum layer, interposed between at least two plastic layers.
  • Fitting 1 comprises a substantially rigid hollow sleeve 2, preferably made of metal, to be inserted in an end of the pipe P, a clamp member 3 having a internally threaded portion to be tightened on the terminal T, and an elastic bushing 4 interposed between the clamp member 3 and the pipe P.
  • Bushing 4 has the function of pressing the end of the pipe P against the hollow sleeve 2 and/or against the terminal T when the clamp member 3 is being tightened on the terminal T.
  • Electrical insulating means 5 are further provided, which are designed to prevent the passage of stray currents between the pipe P and the terminal T.
  • the electrical insulator means 5 comprise a gasket 6 made of an electrically insulating base material having an axial tubular portion 7 adapted to be interposed between the hollow sleeve 2 and the inner surface 8 of the end of the pipe P. Furthermore, the axial tubular portion 7 is joined to a radial portion 9, which is designed to be interposed between the terminal T and the front edge F of the end of the pipe P.
  • the sealing action and the electro-corrosion resistance may be jointly increased as compared with prior art.
  • the shape of the gasket 6, comprising the axial tubular portion 7 and the radial portion 9, effectively prevents any contact between the metal terminal T and the metal layer of the pipe P. This prevents any passage of stray currents as well as any electro-corrosion problem due to the contact between different metals.
  • the axial tubular portion 7 may have an outer cylindrical sealing surface 10 designed to come in contact with the inner surface 8 of the pipe P, and the radial portion 9 may have a substantially flat sealing surface 11 designed to come in contact with the front edge F of the end of the pipe P. Furthermore, the substantially flat sealing surface 11 may have a portion designed to come in contact with a peripheral edge 12 of the bushing 4.
  • the base material of the gasket 6 may be of the polymeric type and be elastically deformable. Especially, the use of an elastomer, e.g. NBR, proved to be particularly effective.
  • the compression of the gasket 6 may be controlled by adjusting the tightening of the clamp member 3. Particularly, it is possible to alternate between a relatively low compression level, adapted to provide a hydraulic and mechanical seal, as shown in FIGS. 2 and 6, and a relatively high compression level, adapted to increase the previously achieved hydraulic and mechanical seal, as shown in FIGS. 3 and 7.
  • sleeve 2 may have external ridges 13 which are designed to at least partly penetrate the inner surface 8 of the pipe P during mounting and prevent any accidental release of the sleeve 2 from the pipe P.
  • the base material of such layer may be arranged to be more resilient than the external ridges 13.
  • the ridges 13 may have a helical shape to allow easy and selective mounting and dismantling of said sleeve with respect to the pipe P.
  • the sleeve 2 may be inserted or removed by imparting thereon a rotary and translatory motion with respect to the pipe P.
  • bushing 4 may have a plurality of longitudinal cutouts 14, 15 which extend at least partly along the longitudinal extension of the bushing 4.
  • the longitudinal cutouts 14, 15 may allow the deformation of the bushing 4 in the radial direction and to easily compress the end of the pipe P when the clamp member 3 is being tightened on the terminal T.
  • Radial deformability of the bushing 4 may be further increased by making the latter from an elastically deformable polymeric base material.
  • the base material of the bushing 4 may also provide electrical insulation, to further prevent the passage of stray currents and generally improve electrical insulation between the pipe P and the terminal T.
  • the bushing 4 is made of a glass fiber-reinforced nylon.
  • the peripheral edge 12 of the bushing 4 may be pressed against the flat sealing surface 11 and also the inner surface 16 of the bushing 4 may be radially pressed against the end of the pipe P.
  • the bushing 4 may have a frusto-conical outer surface 17, which is adapted to interact with a complementarily shaped inner surface 18 of the clamp member 3.
  • bushing 4 may have circumferential ridges 19 on its inner surface 16, which are designed to interact with the outer surface of the pipe P to prevent the bushing 4 from axially slipping away from the pipe P while the clamp member 3 is being tightened. Therefore, not only the peripheral edge 12 of the bushing 4, but also the front edge F of the pipe P may be effectively pressed against the flat sealing surface 11 of the gasket 6. More in detail, upon tightening of the clamp member 3, the circumferential ridges 19 may slightly penetrate the outermost layer of the pipe 9 without tearing the layer, thereby allowing to integrate together the pipe P and the bushing 4 as they press against the gasket 6.
  • the bushing 4 may have an annular ridge 17' on its outer surface 17, for slidably interacting with a housing 18', itself having an annular shape, and formed on the inner surface 18. Therefore, a radial compression effort may be imparted on the pipe P, thereby reducing the axial sleeve 2 insertion effort, thereby facilitating such insertion.
  • housing 18' may have a greater inclination than the inner surface 18.
  • the annular ridge 17' may have a substantially circular and flat end surface S, adapted to abut against a corresponding stop surface S' formed in the housing 18', to act as a stop and prevent the bushing from assuming wrong positions.
  • the inner surface 16 of the bushing 4 may also have longitudinal ridges 20 for interacting with the outer surface of the pipe P to prevent the bushing 4 from rotating when the clamp member 3 is being tightened on the terminal T.
  • the circumferential ridges 19 and the longitudinal ridges 20 may be integral with the bushing 4 and may be made, like the latter, from an elastically deformable polymeric material.
  • the ridges 19, 20 may be less resilient than the outer layer of the pipe P to facilitate their penetration of such layer.
  • the circumferential ridges 19 on an axial sectional plane and the longitudinal ridges 20 on a transverse plane may have a suitably sized rounded profile, to be effective and further prevent the tear of the outermost layer of the pipe P.
  • bushing ' 4 may have indication means for visually showing a user the level of radial compression of the bushing
  • the indication means may be defined by at least one 15 of the longitudinal cutouts of the bushing 4, which may extend along the whole longitudinal extension thereof to the end portion 21 of the bushing 4 which projects out of the clamp member 3 and is visible from the outside. Therefore, when the clamp member 3 is at least partly tightened on the terminal T, the end portion 21 of the bushing 4, as well as a portion of the longitudinal cutout 15 may be visible from the outside. Also, if the amount of tightening of the clamp member 3 and the level of radial compression of the bushing 4 are relatively small, the facing edges 22, 22' of the longitudinal cutout 15 may be visually spaced apart.
  • the facing edges 22, 22' of the longitudinal cutout 15 may be visually closer together.
  • the hydraulic and mechanical seal is provided, whereas when the facing edges 22, 22' are visually closer together, an increased hydraulic and mechanical seal is obtained.
  • the end portion 21 of the bushing 4 may be sized to prevent the clamp member 3 from scrat ching the pipe P as the member 3 is being tightened, and to further protect the pipe from other damages.
  • Sleeve 2 may have a housing 23 for the gasket 6, on its outer surface. Also, in a particular embodiment of the fitting 1, as shown in FIGS. 1-4, sleeve 2 is separated from the terminal T and may be selectively inserted therein. In this embodiment, the sleeve 2 has an end portion 24 which is adjacent the housing 23 and designed to be inserted in the terminal T. Furthermore, in the same embodiment, the gasket 6 may have an end edge 25 which is connected to the radial portion 9 and is designed to contact an inner surface of the terminal T, as shown in FIG. 13.
  • sleeve 2 may have a recessed hexagonal housing 26 at its end portion 24, wherein a tool 27 may be inserted for mounting and removing the sleeve 2 to and from the pipe P.
  • sleeve 2 is integrally joined to the terminal T in the proximity of the housing 23.
  • the inventive fitting fulfils the above objects and particularly the shape of the gasket allows to achieve a high sealing action, while preventing the passage of stray currents and avoiding any electro-corrosion due to the contact between different metals .

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gasket Seals (AREA)

Abstract

Ce raccord résistant à la corrosion pour tuyaux à couches multiples, notamment pour connecter un terminal (T) métallique au moins partiellement fileté à un tuyau (P) à couches multiples comprenant au moins une couche métallique, comprend une gaine creuse sensiblement rigide (2) à insérer dans une extrémité du tuyau (P), un élément de serrage (3) avec une partie filetée intérieure à serrer sur le terminal (T), un raccord réducteur élastique (4) intercalé entre l'élément de serrage (3) et le tuyau (P) de façon à comprimer ce dernier contre la gaine creuse (2) et/ou contre le terminal (T) lorsque l'élément de serrage (3) est serré et des moyens électro-isolants pour empêcher le passage de courants de fuite entre le tuyau (P) et le terminal (T). Ce raccord se caractérise en ce que les moyens électro-isolants comprennent un manchon d'étanchéité en un matériau de base électro-isolant ayant une partie tubulaire axiale (7) à intercaler entre la gaine creuse (2) et la surface intérieure (8) de l'extrémité du tuyau (P), et une partie radiale (9) à intercaler entre le terminal (T) et le bord frontal (F) de l'extrémité du tuyau (P) afin de renforcer aussi bien l'étanchéité que la résistance à la corrosion électrique.
PCT/IB2004/004102 2003-12-12 2004-12-13 Raccord resistant a la corrosion pour tuyaux a couches multiples WO2005059424A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04806336A EP1697673A1 (fr) 2003-12-12 2004-12-13 Raccord resistant a la corrosion pour tuyaux a couches multiples

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVI20030253 ITVI20030253A1 (it) 2003-12-12 2003-12-12 Raccordo di collegamento anticorrosione
ITVI2003A000253 2003-12-12

Publications (1)

Publication Number Publication Date
WO2005059424A1 true WO2005059424A1 (fr) 2005-06-30

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ID=34685658

Family Applications (1)

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PCT/IB2004/004102 WO2005059424A1 (fr) 2003-12-12 2004-12-13 Raccord resistant a la corrosion pour tuyaux a couches multiples

Country Status (3)

Country Link
EP (1) EP1697673A1 (fr)
IT (1) ITVI20030253A1 (fr)
WO (1) WO2005059424A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007042832A1 (fr) * 2005-10-14 2007-04-19 Hepworth Building Porducts Limited Adaptateur pour utilisation avec conduite multicouche
EP1840441A2 (fr) * 2006-03-30 2007-10-03 Hansgrohe AG Elément de raccordement de tuyau
WO2012021833A1 (fr) 2010-08-13 2012-02-16 Bart Petterson Système de cvca à base d'aluminium sans soudure
US8766110B2 (en) 2011-10-07 2014-07-01 Titeflex Corporation Bushings, sealing devices, tubing, and methods of installing tubing
US9541225B2 (en) 2013-05-09 2017-01-10 Titeflex Corporation Bushings, sealing devices, tubing, and methods of installing tubing
CN115585320A (zh) * 2022-10-10 2023-01-10 中国核动力研究设计院 一种非接触式电绝缘密封结构

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE487355A (fr) *
DE2005005A1 (de) * 1970-02-04 1971-08-12 Rheinisches Metallwerk Gmbh Verbindung von rohrartigen, elektrisch gegeneinander isolierten Bau und/oder Lei tungsteilen
DE8503342U1 (de) * 1984-02-17 1985-05-30 Romanelli, Antonio, Neapel/Napoli Verbindungsvorrichtung zum Herstellen einer Verbindung zwischen einem Rohr oder Schlauch, insbesondere aus Kunststoffmaterial, und einem Anschlußstutzen oder Rohrende
DE3520874C1 (de) * 1984-06-26 1986-01-23 Georg Fischer AG, Schaffhausen, CH, Niederlassung: Georg Fischer AG, 7700 Singen Rohrverschraubung für Kunststoffrohre
WO1998001695A1 (fr) * 1996-07-10 1998-01-15 Kang Hoon Park Raccord pour tuyau souple en resine synthetique
EP1020675A1 (fr) * 1999-01-11 2000-07-19 F. X. Bachmann AG Méthode et dipositif pour la fixation d'un conduit sur une pièce

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE487355A (fr) *
DE2005005A1 (de) * 1970-02-04 1971-08-12 Rheinisches Metallwerk Gmbh Verbindung von rohrartigen, elektrisch gegeneinander isolierten Bau und/oder Lei tungsteilen
DE8503342U1 (de) * 1984-02-17 1985-05-30 Romanelli, Antonio, Neapel/Napoli Verbindungsvorrichtung zum Herstellen einer Verbindung zwischen einem Rohr oder Schlauch, insbesondere aus Kunststoffmaterial, und einem Anschlußstutzen oder Rohrende
DE3520874C1 (de) * 1984-06-26 1986-01-23 Georg Fischer AG, Schaffhausen, CH, Niederlassung: Georg Fischer AG, 7700 Singen Rohrverschraubung für Kunststoffrohre
WO1998001695A1 (fr) * 1996-07-10 1998-01-15 Kang Hoon Park Raccord pour tuyau souple en resine synthetique
EP1020675A1 (fr) * 1999-01-11 2000-07-19 F. X. Bachmann AG Méthode et dipositif pour la fixation d'un conduit sur une pièce

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007042832A1 (fr) * 2005-10-14 2007-04-19 Hepworth Building Porducts Limited Adaptateur pour utilisation avec conduite multicouche
EP1840441A2 (fr) * 2006-03-30 2007-10-03 Hansgrohe AG Elément de raccordement de tuyau
EP1840441A3 (fr) * 2006-03-30 2008-06-18 Hansgrohe AG Elément de raccordement de tuyau
WO2012021833A1 (fr) 2010-08-13 2012-02-16 Bart Petterson Système de cvca à base d'aluminium sans soudure
EP2603724A1 (fr) * 2010-08-13 2013-06-19 Bart Petterson Système de cvca à base d'aluminium sans soudure
EP2603724A4 (fr) * 2010-08-13 2014-11-19 Bart Petterson Système de cvca à base d'aluminium sans soudure
AU2011289233B2 (en) * 2010-08-13 2016-05-12 Reflok, Inc. Weldless aluminum based HVAC system
US8766110B2 (en) 2011-10-07 2014-07-01 Titeflex Corporation Bushings, sealing devices, tubing, and methods of installing tubing
US9541225B2 (en) 2013-05-09 2017-01-10 Titeflex Corporation Bushings, sealing devices, tubing, and methods of installing tubing
CN115585320A (zh) * 2022-10-10 2023-01-10 中国核动力研究设计院 一种非接触式电绝缘密封结构
CN115585320B (zh) * 2022-10-10 2024-04-26 中国核动力研究设计院 一种非接触式电绝缘密封结构

Also Published As

Publication number Publication date
ITVI20030253A1 (it) 2005-06-13
EP1697673A1 (fr) 2006-09-06

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