EP0479831A1 - Raccord pour tubes polymeres - Google Patents

Raccord pour tubes polymeres

Info

Publication number
EP0479831A1
EP0479831A1 EP90909581A EP90909581A EP0479831A1 EP 0479831 A1 EP0479831 A1 EP 0479831A1 EP 90909581 A EP90909581 A EP 90909581A EP 90909581 A EP90909581 A EP 90909581A EP 0479831 A1 EP0479831 A1 EP 0479831A1
Authority
EP
European Patent Office
Prior art keywords
bore
nut
ferrule
plug
fitting
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Withdrawn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
EP90909581A
Other languages
German (de)
English (en)
Other versions
EP0479831A4 (en
Inventor
Graham Michael Johnson
Suzanne Margaret Quigley
Paul Edward Nolan
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.)
Commonwealth Scientific and Industrial Research Organization CSIRO
Original Assignee
Commonwealth Scientific and Industrial Research Organization CSIRO
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 Commonwealth Scientific and Industrial Research Organization CSIRO filed Critical Commonwealth Scientific and Industrial Research Organization CSIRO
Publication of EP0479831A1 publication Critical patent/EP0479831A1/fr
Publication of EP0479831A4 publication Critical patent/EP0479831A4/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Withdrawn legal-status Critical Current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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/04—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with a swivel nut or collar engaging the pipe

Definitions

  • This invention relates to gas and liquid plumbing fittings and more particularly to polymeric fittings for use with corrosive, reactive or pure fluids.
  • Fluorlnated polymers such as TEFLON® have been used in vessels and their linings, tubing and plumbing fittings.
  • gas and liquid plumbing fittings such as unions and tees have been fabricated from TEFLON® or other non-corrosive polymers. While such non-corrosive polymeric materials have excellent chemical resistance, they can have poor mechanical properties, including a propensity to cold flow. Where threads are cut Into the material, the threads are weak and are easily cross-threaded. Complex or detailed machining of these mechanically unstable plastics is often difficult and expensive. Further, the fluid pressures that the fittings can with stand 1s limited by the cold flow properties of the polymeric material.
  • 1t is an object of the invention to ameliorate some of the disadvantages of the prior art.
  • a fitting comprising a polymeric plug having a first bore.
  • the first bore is characterised by a relief portion and a tapered section which leads from the relief portion to ar enlarged portion.
  • the polymeric plug is received by a case.
  • the case has a threaded open g leading into th ⁇ enlarged section.
  • a nut having a second bore and an exterior threaded portion is received by the threaded opening.
  • a polymeric ferrule is provided having a tapered exterior nose which is engageable with the tapered section of the first bore.
  • Figure 1 1s a cross sectional view of a connector incorporating the polymeric fittings of the present Invention.
  • Figure 2 1s a cross sectional view of an alternate embodiment of a connector Incorporating the polymeric fittings of the present Invention.
  • Figure 3 1s a prospective view of a polymeric ferrule which 1s used 1n conjunction with the present Invention.
  • Figure 4 1s a cross sectional view of a nut adapted to receive the polymeric ferrule of Figure 3.
  • Figure 5 1s an alternate embodiment of the plug and case of the present invention.
  • Figure 6 is a cross sectional view of a threaded nut, ferrule and grip ring.
  • Figure 7 1s a cross sectional view of a nut incorporating a gripping blade.
  • a connector 10 may be manufactured with polymeric fittings according to the teachings of the present invention.
  • the connector 10 Includes a polymeric plug 11 Into which has been formed a plug bore 12.
  • the plug bore 12 is perpendicular to the cylindrical axis of the plug 11.
  • the plug bore 12 includes a fluid carrying conduit 13, a relief portion 14, a tapered portion 15 and an enlarged portion 16.
  • Relief portions 14 are a preferred feature of the invention.
  • the plug 1s formed from a corrosion resistant polymeric material for example one of the fluorinated hydrocarbon polymers such as TEFLON®, including PTFE grade TEFLON®.
  • the plug 11 is encircled by a cylindrical metallic case 29.
  • the case includes a threaded opening 60 which is aligned with the enlarged portion 16.
  • the enlarged portion 16 of the bore is adapted to receive a polymeric ferrule 17.
  • the ferrule includes a central bore 18, a tapered nose 19 and a tapered piloted surface 20.
  • the taper angle L of the nose is less than the taper angle M of the tapered section 15 of the plug bore.
  • the piloted portion 20 of the ferrule co-operates with a tapered forward pilot surface 21 formed in a threaded nut 22.
  • the taper angle of the piloted surface 20 is equal to the nose taper L but may be less than the taper angle of the pilot surface 21.
  • the nut 22 also Includes a central passage 23, exterior threads 24 and flat surfaces 25 for operating the nut.
  • a tube 27 is inserted through the passage 23 of the nut and into the central bore 18 of the ferrule. This assembly is pushed through the opening 60 and Into the plug until the nose 19 of the ferrule contacts the tapered section 15 of the plug bore and the tube 27 locates against the Inner end of the relief portion 14. The fitting is tightened by engaging the threads 24 of the nut with matching threads 28 1n the opening 60. Continued tightening of the nut drives the ferrule into the tapered portion 15 and brings together the piloted surface 20 of the ferrule and the pilot surface 21 of the nut.
  • the fitting When assembled, the fitting provides a joint where the areas in contact with the fluid being handled are all corrosion resistant polymeric material.
  • two fittings are used to form a connector. It will be appreciated that, for example, three fittings could be joined to a common central fluid conduit 13 thus forming a "T" or "Y". Manifolds which Include four or more fittings would be easily fabricated according to the aforesaid teachings.
  • An alternate embodiment of a connector or coupling incorporating two improved polymeric fittings of the present invention is shown 1n Figure 2. Like the device of Figure 1, a round plug 11 is circumferentially surrounded by an annular case 29, and two similar fittings are aligned along a common axis.
  • the axis is diametrical with regard to the round or circular plug. This arrangement can be easily extended to a coupling Incorporating three or more fittings arranged around the circumference of the plug and case and fluidlcally merging in an area common to each fitting bore.
  • the polymeric ferrule 30 further Includes an elongated hollow shaft 31.
  • the shaft terminates in a flange 32.
  • the flange 32 and distal portion of the shaft are sub-divided by a plurality of slots 33.
  • the forward pilot section 34 of the nut includes both a tapered portion 35 and an annular r1m 36 for guiding and retaining the ferrule.
  • the slots 33 are provided so that the ferrule may be inserted Into the nut from the forward section 34, and so that the ferrule will be snugly retained by the nut throughout all phases of operation. It will be appreciated that by the provision of the elongated shaft 31 and flange 32, it is possible to visually ascertain whether or not the ferrule has been included In the assembled fitting owing to the obvious presence or absence of the flange 32. Thus it is unnecessary to disassemble the fitting in order to tell whether or not the ferrule has been included.
  • the case 29 may be provided with a threaded opening 60 or other means for attaching the case to a panel or stand. This will further reduce the stresses on the tubing.
  • FIG. 3 Another example of a polymeric ferrule made 1n accordance with the teachings of the invention is depicted in Figure 3.
  • the ferrule includes a flange 32, four slots 33, an elongated shaft 31 and a tapered nose 19.
  • the nose 19 terminates in a flat face 61.
  • the piloted surface 37 1s not tapered. Rather, the piloted surface includes a cylindrical shoulder 38 and an annular seat surface 39.
  • This form of piloted surface is adapted for an alternate nut as depicted in Figure 4.
  • the nut 40 in Figure 4 includes an enlarged recess 41 for receiving the shoulder 38.
  • the pilot surface of the nut is in the form of an annular lip 42 which includes a flat face 43 which is adapted to contact the seat 39 of the ferrule's piloted portion.
  • the nut also includes a generally cylindrical exterior surface 44 having exterior threads 45 and two flat surfaces 46 for operating the nut.
  • FIG. 5 A further embodiment of the plug and case are depicted 1n Figure 5.
  • the plug bore includes a tapered portion 52 which leads from a relief portion 58 into an enlarged section 53.
  • the cylindrical plug 50 terminates 1n a flat face 54.
  • the case 55 Is In the form of a cylinder which is longer than the plug 50.
  • the end face 56 of the cylinder extends beyond the terminal portion 54 of the plug.
  • internal threads 57 may be provided for receiving any one of the nut and ferrule embodiments taught with reference to Figures 1, 2, 3 and 4.
  • the ferrule 61 may be provided with one flat face 62 opposite the tapered nose end 63.
  • a grip ring 64 has a matching tapered end 65 and flat end face 66.
  • the grip ring 64 is preferably provided with a single longitudinal split 67 so that it radially contracts when the nut 68 is tightened.
  • the grip ring may include any variety of Internal projections 69, within its bore, for aiding in the gripping of the tube.
  • the gripping ring is not essential to the fluidic seal, nor does it come into contact with the carried fluid. It may therefore be fabricated from any convenient material Including, but.
  • a similar gripping effect may be provided by equipping a nut 70 with a blade-like gripper 71 which may be formed from spring steel or hard plastic.
  • the gripper 71 is fitted into a slot 72 formed in the nut 70 so that an inner end 73 of the gripper extends into the bore 74 and is inclined towards the ferrule 17.
  • the nut 70 and gripper 71 as described with reference to Figure 7 may be used in conjunction with a ferrule having an elongated hollow shaft as shown in Figure 8.
  • the ferrule is similar to the design depicted 1n Figure 3 but also includes an opening or slot 75 in the shaft 31 and flange 32 to provide clearance between the blade-Hke gripper 71 and the ferrule when the ferrule is inserted into nut 70.
  • the gripper 71 extends into the interior portion of the hollow shaft so that the edge 73 may contact and grip the tube which passes through the ferrule.
  • This configuration provides the benefits of added resistance to tube pull-out from the gripper and the ability to visually ascertain that the ferrule and gripper are in place without disassembly of the fitting.
  • any number of polymeric materials are suitable for the plug and ferrule. Any polymeric material which is inert or not corroded by the material which it is carrying would be considered suitable. A material would be considered suitable for the case and nut when it provides better strain resistance than the polymeric material, particularly resistance to cold flow, or superior machining qualities such as ease of thread cutting.
  • any number of fluid or gas handling devices may Incorporate the improved polymeric fittings of the invention without departing from the inventive spirit thereof.
  • the fitting and couplings of the present invention are particularly well adapted to tubes which handle corrosive, reactive or pure fluids.
  • the Invention 1s easily applied to a fitting or coupling in which the gas or liquid contacting parts are made from an inert polymer and yet threads are not required in any of the polymeric parts of said fittings or couplings.

Abstract

Le raccord de tube décrit, qui est particulièrement conçu pour des tubages en matériau polymère inerte, comprend un élément mâle polymère (11) comportant un siège à section conique décroissante (15) et une partie de relaxation (14) dans un alésage (16). L'élément mâle (11) est reçu dans un logement (29) comportant une ouverture taraudée (28) à proximité adjacente de l'alésage (16) de l'élément mâle. Une ferrure (17) et un écrou fileté (25) scellent le tube polymère contre l'élément mâle (11). La ferrure peut se prolonger à travers l'alésage de l'écrou et être retenue dans l'écrou au moyen d'un bord rabattu (32, figure 2) situé à l'extrémité externe de l'écrou. Le raccord peut comprendre des organes de serrage supplémentaires (64, 71, figures 6 et 7) destinés à résister aux forces de traction axiale du tube polymère.
EP19900909581 1989-07-03 1990-07-03 Polymeric tube fitting Withdrawn EP0479831A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPJ505489 1989-07-03
AU5054/89 1989-07-03

Publications (2)

Publication Number Publication Date
EP0479831A1 true EP0479831A1 (fr) 1992-04-15
EP0479831A4 EP0479831A4 (en) 1992-07-15

Family

ID=3774035

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900909581 Withdrawn EP0479831A4 (en) 1989-07-03 1990-07-03 Polymeric tube fitting

Country Status (3)

Country Link
EP (1) EP0479831A4 (fr)
AU (1) AU5852590A (fr)
WO (1) WO1991000470A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8569070B2 (en) 2010-07-16 2013-10-29 Idex Health & Science Llc Connection assembly for ultra high pressure liquid chromatography
US9056264B2 (en) 2010-07-16 2015-06-16 Idex Health & Science Llc Biocompatible tubing for liquid chromatography systems
GB2486679B (en) 2010-12-22 2017-10-04 Agilent Technologies Inc Dual-material approach for high pressure bioinert flow path components
US11187360B2 (en) 2014-10-23 2021-11-30 Idex Health & Science Llc Fluidic connector assembly for quick connect/disconnect
WO2016065334A1 (fr) 2014-10-23 2016-04-28 Idex Health & Science Llc Système de raccordement fluidique à scellement de face
US9671048B2 (en) 2014-10-23 2017-06-06 Idex Health & Science Llc Manifold connection assembly

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH545937A (fr) * 1972-05-24 1974-02-15
JPS51114718A (en) * 1975-03-31 1976-10-08 Shinichi Kawashima Pipe coupling
AU3983485A (en) * 1984-03-15 1985-09-19 Actrol Industries Pty. Ltd. Pipe/member compression connection

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9100470A1 *

Also Published As

Publication number Publication date
EP0479831A4 (en) 1992-07-15
WO1991000470A1 (fr) 1991-01-10
AU5852590A (en) 1991-01-17

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