WO1997014905A1 - Raccord pour tuyaux - Google Patents

Raccord pour tuyaux Download PDF

Info

Publication number
WO1997014905A1
WO1997014905A1 PCT/SE1995/001211 SE9501211W WO9714905A1 WO 1997014905 A1 WO1997014905 A1 WO 1997014905A1 SE 9501211 W SE9501211 W SE 9501211W WO 9714905 A1 WO9714905 A1 WO 9714905A1
Authority
WO
WIPO (PCT)
Prior art keywords
ofthe
ring
bite
male
pipe
Prior art date
Application number
PCT/SE1995/001211
Other languages
English (en)
Inventor
Thomas Arvidsson
Original Assignee
Avesta Nords Aktiebolag
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 Avesta Nords Aktiebolag filed Critical Avesta Nords Aktiebolag
Priority to AU41255/96A priority Critical patent/AU4125596A/en
Priority to PCT/SE1995/001211 priority patent/WO1997014905A1/fr
Publication of WO1997014905A1 publication Critical patent/WO1997014905A1/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
    • F16L19/00—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
    • F16L19/08—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 with metal rings which bite into the wall of the pipe
    • F16L19/10—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 with metal rings which bite into the wall of the pipe the profile of the ring being altered
    • F16L19/12—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 with metal rings which bite into the wall of the pipe the profile of the ring being altered with additional sealing means

Definitions

  • the present invention relates to a pipe coupling ofthe kind that includes a threaded male part having a part with an internal conical surface and an abutment edge for abutment with a pipe to be connected to the male part, a threaded female part, and a bite ring which is located between the male part and the female part and which includes a press-in part which is adapted to be pressed into the conical part ofthe male part as the male and female parts are screwed together, such that a front edge ofthe press part will bite into the pipe extending coaxially with the coupling.
  • Couplings of this kind have long been used to provide a sealed connection between pipe and other components, without needing to pre- work the pipe.
  • One example of a development of a still older basic principle is disclosed in SE-B-333 851.
  • Couplings of this type are based on the fundamental principle whereby the press-in portion ofthe bite ring is pressed into the conical part ofthe male part as the coupling is tightened, wherewith the outer surface ofthe press-in portion slides against the conical outer surface ofthe male part while generating between the surfaces a pressure of such high magnitude as to cause the front edge ofthe bite ring to bite into the pipe extending coaxially with the coupling.
  • the object ofthe invention is to provide a highly sealing- effective pipe coupling ofthe kind defined in the preamble. More particularly, the object is to provide an effective seal at very high medium pressures and vibrations in pipelines. Another object is to provide a pipe coupling that is comprised essentially of standard components.
  • Fig. 1 is a cross- sectional view of a coupling-half and a pipe-half, with the centre line indicated; and Fig. 2 is a cross-sectional view ofthe half-coupling and half-pipe after having tightened the thread connection.
  • the main parts ofthe coupling comprise a threaded male part 1, a threaded female part 2 in the form of a tightening nut which coacts with the male part, and a bite ring 3, wherein all of said parts are penetrated by the pipe 5 to be coupled in abutment with an abutment edge lc on the male part 1
  • the bite ring 3 includes a press-in part 3 a which is intended to be pressed into the male part 1, which has an inner conical mantle surface la, such as to deform the press-in part 3 a
  • the deformed parts have been identified in Fig. 2 with the addition of a prime
  • the inner conical mantle surface la ofthe male part has a fist slope angle vl .
  • the bite ring 3 has an edge 3 b furthest forward ofthe ring and the region located nearest the edge 3 b is designated the pointed part 3 c. Prior to deformation ofthe bite ring 3, this pointed part will have a mantle surface ofthe same slope angle vl as the inner conical mantle surface 1 a ofthe male part 1.
  • the remainder ofthe press-in part 3 a which extends from a bend 3d on the bite ring rearwardly to a rear cylindrical part 3g, has a conical mantle surface 3e whose slope angle v2 is smaller than the first slope angle vl
  • a first wedge-shaped (in cross-section) gap 6 will be formed between the conical mantle surface la of the male part and the mantle surface 3e ofthe press-in part 3a rearwardly ofthe front pointed part 3c
  • the mantle surface 3e ofthe press-in part 3 a includes an O-ring groove 3g which accommodates an O-ring 4
  • the width ofthe groove 3g is greater than the diameter ofthe O- ring 4
  • the bite ring 3 also typically includes an inner conical part having a rearwardly sloping conical mantle surface 3h such as to form a second wedge-shaped (in cross-section) part 7 between said inner conical surface 3h and the pipe 5 in a known manner
  • the sum ofthe second angle v2 and the wedge angle v3 (or its complementary angle) is typically equal to the first angle vl
  • the wedge-shaped part 7 extends to a plane B which extends pe ⁇ endicular to the coupling centre line 8 and which forms the base for the region of bite ring deformation
  • base for the region of bite ring deformation is meant that those parts located forwardly ofthe base plane B will be deformed and/or pressed-in against or into the pipe whereas remaining parts, ie those located rearwardly ofthe base plane (to the right ofthe plane B in Fig. 1) will remain intact.
  • the O-ring groove is placed forwardly ofthe base plane B. More specifically, in the case of the illustrated embodiment the O-ring groove 3g is spaced forwardly ofthe base plane B by a distance which may be smaller than the width ofthe groove 3g, at least in the case of small pipe dimensions (to which the illustrated embodiment relates).
  • the O-ring groove 3g will still lie essentially outside the outer edge lb of the male part 1.
  • the O-ring 4 has no contact with the male part 1 in this initial position.
  • the coupling nut 2 (the female part) is screwed onto the male part 1 such as to press the rear part 2a ofthe nut 2 forwards against the rear part 3i of the bite ring 3, in a known manner.
  • the forward part 3 c ofthe bite ring will herewith be pressed with great force against the inner conical mantle surface la ofthe male part 1 and slide thereagainst, wherewith the edge 3b ofthe pointed part 3 c will bite into the pipe 5 at the same time as the whole ofthe press-in part 3 a located forwardly ofthe base plane B is successively deformed and/or pressed into the pipe.
  • the inner conical surface 3h ofthe bite ring is thus pressed in against the pipe 5 during bending ofthe bite ring roughly in the base plane B, at the same time as the bite ring advances while the outer conical surface 3e ofthe bite ring and the inner conical surface la ofthe male part slide against one another.
  • those parts ofthe conical mantle surface 3e that lie immediately forwards of and rearwardly ofthe O-ring groove 3g have still not come into direct contact with the inner conical surface la of the male part 1. This occurs when the rear wall 3j ofthe groove 3g has passed the front edge lb ofthe male part 1.
  • the O-ring 4 will also herewith come into contact with the inner mantle surface ofthe male part, which contact area has not been scored or scratched by sliding between metal surfaces and is therefore undamaged. It is possible that a certain, very slight amount of sliding may take place between the O-ring 4 and the inner conical surface la ofthe male part 1 at the very last moment, although no damage will be caused to the O-ring 4 because said surface is undamaged and free from scratches. In the final stage, as in the ideal case shown in Fig.
  • the mantle surfaces 3e' and 3h' ofthe press-in part 3a 1 will lie essentially against the conical inner surface la ofthe male part 1 and against the pipe 5 respectively, the pointed part 3 c' will be pressed into the pipe 5, and the O- ring 4 will lie sealingly against the inner mantle surface la ofthe male part and against the rear wall 3j ofthe O-ring groove 3g. Complete sealing is achieved with this coupling at pressures of up to at least 1500 bars.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Joints With Pressure Members (AREA)

Abstract

La présente invention concerne un raccord pour tuyaux, qui comprend une partie mâle filetée (1) ayant une pièce qui comporte une surface conique intérieure (1a) et un épaulement (1c) venant en butée contre un tuyau (5) qui doit être relié à la partie mâle, une partie femelle filetée (2) et une bague-filière qui se trouve entre les parties mâle et femelle et qui comprend une pièce à enfoncer, conçue pour être enfoncée dans la partie conique de la partie mâle lorsque celle-ci et la partie femelle sont vissées ensemble, de telle sorte que le bord avant (3b) de la pièce à enfoncer va s'enfoncer dans le tuyau qui est coaxial avec le raccord. La pièce à enfoncer de la bague-filière comporte extérieurement une rainure annulaire (3g) servant à loger une bague d'étanchéité (4) qui est pressée, d'une manière assurant l'étanchéité, contre la surface conique intérieure de la partie mâle lorsque celle-ci et la partie femelle sont vissées ensemble.
PCT/SE1995/001211 1995-10-17 1995-10-17 Raccord pour tuyaux WO1997014905A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU41255/96A AU4125596A (en) 1995-10-17 1995-10-17 Tube coupling
PCT/SE1995/001211 WO1997014905A1 (fr) 1995-10-17 1995-10-17 Raccord pour tuyaux

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE1995/001211 WO1997014905A1 (fr) 1995-10-17 1995-10-17 Raccord pour tuyaux

Publications (1)

Publication Number Publication Date
WO1997014905A1 true WO1997014905A1 (fr) 1997-04-24

Family

ID=20397810

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1995/001211 WO1997014905A1 (fr) 1995-10-17 1995-10-17 Raccord pour tuyaux

Country Status (2)

Country Link
AU (1) AU4125596A (fr)
WO (1) WO1997014905A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10024468B2 (en) 2014-05-09 2018-07-17 Swagelok Company Conduit fitting with components adapted for facilitating assembly
US10215315B2 (en) 2008-09-05 2019-02-26 Parker-Hannifin Corporation Tube compression fitting and flared fitting used with connection body and method of making same
US10584814B2 (en) 2016-03-23 2020-03-10 Swagelok Company Conduit fitting with stroke resisting features

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE333851B (fr) * 1968-05-29 1971-03-29 H Kreidel
SE388920B (sv) * 1971-12-11 1976-10-18 Voss Armaturen Roranslutning
WO1993025837A1 (fr) * 1992-06-17 1993-12-23 Lehmann Klaus Dieter Dispositif de raccordement pour tuyauterie

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE333851B (fr) * 1968-05-29 1971-03-29 H Kreidel
SE388920B (sv) * 1971-12-11 1976-10-18 Voss Armaturen Roranslutning
WO1993025837A1 (fr) * 1992-06-17 1993-12-23 Lehmann Klaus Dieter Dispositif de raccordement pour tuyauterie

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10215315B2 (en) 2008-09-05 2019-02-26 Parker-Hannifin Corporation Tube compression fitting and flared fitting used with connection body and method of making same
US10024468B2 (en) 2014-05-09 2018-07-17 Swagelok Company Conduit fitting with components adapted for facilitating assembly
US11079046B2 (en) 2014-05-09 2021-08-03 Swagelok Company Conduit fitting with components adapted for facilitating assembly
US10584814B2 (en) 2016-03-23 2020-03-10 Swagelok Company Conduit fitting with stroke resisting features
US11009158B2 (en) 2016-03-23 2021-05-18 Swagelok Company Conduit fitting with stroke resisting features

Also Published As

Publication number Publication date
AU4125596A (en) 1997-05-07

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