WO1987001788A1 - Raccord de tuyaux a fluide refrigerant - Google Patents

Raccord de tuyaux a fluide refrigerant Download PDF

Info

Publication number
WO1987001788A1
WO1987001788A1 PCT/SE1986/000416 SE8600416W WO8701788A1 WO 1987001788 A1 WO1987001788 A1 WO 1987001788A1 SE 8600416 W SE8600416 W SE 8600416W WO 8701788 A1 WO8701788 A1 WO 8701788A1
Authority
WO
WIPO (PCT)
Prior art keywords
coupling
pipe
sleeve
metal
pipe coupling
Prior art date
Application number
PCT/SE1986/000416
Other languages
English (en)
Inventor
Bertil SJÖSTEDT
Roland Kall
Original Assignee
Elektro Standard Ab
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 Elektro Standard Ab filed Critical Elektro Standard Ab
Publication of WO1987001788A1 publication Critical patent/WO1987001788A1/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
    • F16L25/03—Electrically insulating joints or couplings in non-disconnectable pipe joints
    • 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
    • F16L25/025—Electrically insulating joints or couplings for joints with sleeve or socket

Definitions

  • the invention relates to a fluid-sealed, electrically insulated coupling of two metal pipes intended for the flow of a refrigerant fluid, especially of fluorocarbon type, such as dichlorodifluoromethane (R12), monochloride fluoromethane (R22) or a mixture of monochloride fluoromethane and monochloropentaf luoroethane (R502). More particularly, the invention relates to a pipe coupling of the kind defined in the preamble of claim 1.
  • Refrigerant fluids of the above-mentioned types are normally used in refrigerant circulation circuits, especially in heat pump systems.
  • conduits of copper are normally used, which are resistant to such refrigerant fluids and stand the prevailing temperatures (up to about 150°C) and pressures (up to about 30-50 bar).
  • it has turned out to be necessary to keep certain parts of the conduit circuit electrically insulated from the other parts of the circuit in particular in water heaters in systems where heat is transferred from an exhaust air heat exchanger to consumption hot water by means of a heat pump.
  • the part of the copper circuit located in the water heater must be kept electrically insulated from the container wall and also from the heat pump compressor, since the latter, as well as the container wall, is normally earthed.
  • the coupling sleeve which is radially pressed between the pipe end portions and an external clamping sleeve, consists of polytetrafluoroethylene (PTFE) having a sleeve wall thickness of 0,5 - 2,0 mm, whereas the distance between the two metal pipe ends is 0,5 - 2,0 mm and does not exceed twice the thickness of the sleeve wall.
  • PTFE polytetrafluoroethylene
  • DE-A-15 25 648 discloses a pipe coupling (for hot water pipes) having a coupling sleeve of plastic material which is radially pressed between each pipe end portion and an external clamping sleeve, wherein the distance between the pipe ends is of the same magnitude as the thickness of the coupling sleeve wall.
  • the coupling sleeve is separated into two parts each enclosing the respective pipe end portion.
  • Such an arrangement cannot be used for refrigerant fluids, because leakage will inevitably occur.
  • polytetrafluoroethylene as a material for the coupling sleeve, and there is no suggestion indicating that the relation between the pipe end distance and the sleeve wall thickness would be critical.
  • Fig. 1 shows an axial section through a pipe coupling according to a first embodiment of the invention
  • Fig. 2 shows a corresponding section through a second embodiment.
  • two copper pipes 1,2 are at their free ends permanently joined to relatively short steel tubes 3 and 4, respectively, which are internally coated with copper.
  • the joints between the copper pipes and the steel tubes consist of sleeve portions 5 and
  • each sleeve portion 5,6 having a relatively large diameter and into which each copper pipe end has been inserted and secured by solding in such way that the respective steel tube 3, 4 internally adjoins the corresponding copper tube 1,2.
  • the steel tubes 3,4 are externally provided with circumf erentially extending rims 7 intended to engage into a
  • This coupling sleeve 8 extends axially along the major parts of the two steel tubes 3,4 and also encloses the space between the free ends of the steel tubes.
  • An external clamping sleeve 9 with internal, circumf erentially extending rims 10 encloses the coupling sleeve 8 along the major part of the length thereof.
  • the distance d between the free ends of the pipes is not too large. Naturally, it must exceed the shortest distance necessary for electrical insulation of the tubes 3,4 and, consequently, of the copper pipes 1,2.
  • the distance d can possibly be 0,5 -2,0 mm but must not exceed twice the wall thickness t of the coupling sleeve 8. This wall thickness may amount to 0,5 - 2,0 mm.
  • the distance d between the pipe ends should preferably be selected so as to correspond to 10-20% of the external diameter of the pipe end portions 3,4, which external diameter normally may amount to 7-10 mm.
  • the distance d may suitably be 0,7 - 2,0 mm.
  • the wall thickness t should be 0,8 - 1,2 mm.
  • the pipe end portions When making the pipe coupling, the pipe end portions may be held at a well-defined, desired mutual distance d by securing the sleeves 5 and 6 in a fixture.
  • each tube 3',4' has an external diameter which increases towards the central portion of the pipe coupling.
  • the coupling sleeve 8' and the clamping sleeve 9' are likewise conical (having a larger diameter centrally), but the thickness is substantially constant.
  • the conicity half the angle of the top of the cone
  • Such a conical structure of the pipe coupling gives a still better sealing effect, especiallly at relatively high internal pressures.
  • the co-operating conical surfaces prevent the pipe ends from moving apart from each other and, additionally, the clamping effect of the coupling sleeve 8' is increased under the influence of an internal pressure.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
  • Thermal Insulation (AREA)

Abstract

Raccord de tuyaux pour assurer le raccordement de deux tuyaux métalliques de manière étanche au fluide et garantissant un isolement électrique (1, 3) respectivement (2, 4) destiné à permettre l'écoulement d'un fluide réfrigérant à pression et température élevées. Le raccord comporte un manchon de raccordement (8) en polytétrafluoroéthylène et un manchon (9) métallique de serrage externe. L'épaisseur de la paroi (T) du manchon de raccordement (8) est comprise entre 0,5 et 2,0 mm. La distance (d) entre les deux extrémités des tuyaux métalliques est comprise entre 0,5 et 2,0 mm et ne doit pas dépasser deux fois l'épaisseur (T) de la paroi du manchon, c'est-à-dire d <= 2t. De cette manière on obtient une bonne étanchéité même après une longue utilisation.
PCT/SE1986/000416 1985-09-20 1986-09-17 Raccord de tuyaux a fluide refrigerant WO1987001788A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8504374A SE450523B (sv) 1985-09-20 1985-09-20 Rorforbindning for koldmedieror
SE8504374-3 1985-09-20

Publications (1)

Publication Number Publication Date
WO1987001788A1 true WO1987001788A1 (fr) 1987-03-26

Family

ID=20361471

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1986/000416 WO1987001788A1 (fr) 1985-09-20 1986-09-17 Raccord de tuyaux a fluide refrigerant

Country Status (3)

Country Link
CA (1) CA1286335C (fr)
SE (1) SE450523B (fr)
WO (1) WO1987001788A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29515269U1 (de) * 1995-09-23 1995-11-30 D.F. Liedelt "Velta" Produktions- und Vertriebs-GmbH, 22851 Norderstedt Verbindungssystem für außen und innen mit Kunststoff beschichtete Sanitärrohre
WO2007148998A1 (fr) * 2006-06-19 2007-12-27 Bogdar Tymkiewicz Joint de conduite isolant

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1525648A1 (de) * 1966-04-22 1969-06-12 Gen Electric Co Ltd Verfahren zum Verbinden der Enden duennwandiger Metallrohre
SE371682B (fr) * 1968-12-21 1974-11-25 L Bagnulo
US3893718A (en) * 1973-11-23 1975-07-08 Jonathan S Powell Constricted collar insulated pipe coupling
DE2701340A1 (de) * 1976-04-29 1977-11-03 Psi Products Inc Verfahren zur herstellung einer isolierenden rohrverbindung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1525648A1 (de) * 1966-04-22 1969-06-12 Gen Electric Co Ltd Verfahren zum Verbinden der Enden duennwandiger Metallrohre
SE371682B (fr) * 1968-12-21 1974-11-25 L Bagnulo
US3893718A (en) * 1973-11-23 1975-07-08 Jonathan S Powell Constricted collar insulated pipe coupling
DE2701340A1 (de) * 1976-04-29 1977-11-03 Psi Products Inc Verfahren zur herstellung einer isolierenden rohrverbindung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29515269U1 (de) * 1995-09-23 1995-11-30 D.F. Liedelt "Velta" Produktions- und Vertriebs-GmbH, 22851 Norderstedt Verbindungssystem für außen und innen mit Kunststoff beschichtete Sanitärrohre
WO2007148998A1 (fr) * 2006-06-19 2007-12-27 Bogdar Tymkiewicz Joint de conduite isolant

Also Published As

Publication number Publication date
SE8504374D0 (sv) 1985-09-20
SE8504374L (sv) 1987-03-21
CA1286335C (fr) 1991-07-16
SE450523B (sv) 1987-06-29

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