EP0043524A1 - Method of jointing shielded cables of small diameter insulated by a compressed mineral - Google Patents

Method of jointing shielded cables of small diameter insulated by a compressed mineral Download PDF

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Publication number
EP0043524A1
EP0043524A1 EP81104973A EP81104973A EP0043524A1 EP 0043524 A1 EP0043524 A1 EP 0043524A1 EP 81104973 A EP81104973 A EP 81104973A EP 81104973 A EP81104973 A EP 81104973A EP 0043524 A1 EP0043524 A1 EP 0043524A1
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EP
European Patent Office
Prior art keywords
cables
tube element
diameter
cable
tube
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Granted
Application number
EP81104973A
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German (de)
French (fr)
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EP0043524B1 (en
Inventor
Jean-Claude Bourget
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.)
Cables de Lyon SA
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Cables de Lyon SA
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Filing date
Publication date
Application filed by Cables de Lyon SA filed Critical Cables de Lyon SA
Publication of EP0043524A1 publication Critical patent/EP0043524A1/en
Application granted granted Critical
Publication of EP0043524B1 publication Critical patent/EP0043524B1/en
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49194—Assembling elongated conductors, e.g., splicing, etc.
    • Y10T29/49195—Assembling elongated conductors, e.g., splicing, etc. with end-to-end orienting

Definitions

  • the present invention relates to a method of joining shielded cables of small diameter with compressed mineral insulator, in particular thermocouple cables.
  • the object of the present invention is to enable two shielded cables with compressed mineral insulation to be welded to the end, avoiding any excess thickness at the junction, and obtaining a junction having a mechanical resistance little different from that of the initial cable; it also aims to ensure the continuity of the conductors and to maintain the dielectric characteristics of the initial cables.
  • Welding operations are preferably carried out with an arc under inert gas without filler metal
  • the shrinking of the ends of the cables to be joined is preferably carried out according to an angle cone at the apex approximately 20 °.
  • thermocouple cables of the kind sold by the applicant under the brand name "Pyrotenax”.
  • the two cables to be joined 1 and 2 each 3 mm in diameter, each include two conductors made of nickel-chromium alloy and alloyed nickel, a sheath of stainless steel and a mineral insulator formed by magnesia.
  • a tube element 3 with a slightly larger diameter, for example 4 mm, length 20 mm, is prepared, which is split longitudinally between two generators spaced about 1 mm apart (not shown).
  • the ends 6, 7 of the cables are shrunk to a final diameter of approximately 1.6 mm, with a shrink cone angle 4.5, of 20 °, over a length close to 15 mm.
  • the ends are stripped over 5 mm in length.
  • the junction tube element is put in place around the ends of the sheaths, and is temporarily held in place by pointing by arc welding under inert gas.
  • the mineral insulation 14 is then reconstituted in the junction zone by introducing the powdered insulation through the slot of the element. of tube until filling it. Then the slot is closed by exerting on the tube element a radial compression and by welding its edges to the arc under inert gas without filler metal.
  • a final welding or brazing of the edges of the tube element is then carried out on the cable sheaths and the remaining gaps are filled with solder 15, 16.
  • junction zone is subjected to a drawing pass so as to calibrate it to the initial diameter of the cables.
  • thermocouple cable junction thus manufactured a tensile strength of approximately 80% of that of the initial cable when the ends of the cable element were welded on the sheaths of the cables, and of approximately 50 % of that of the original cable when they were brazed.

Abstract

Procédé de jonctionnement de câbles blindés (1, 2) à isolant minéral comprimé, de faible diamètre. On utilise un élément de tube (3) d'un diamètre externe un peu supérieur au diamètre externe de la gaine des tubes, et muni d'une fente longitudinale. On rétreint les extrémités (6, 7) des câbles, puis en dénude une partie, on soude les conducteurs internes, met en place l'élément de tube autour de ceux-ci, reconstitue l'isolant minéral en poudre, puis comprime cet élément de tube, soude les bords de sa fente longitudinale, puis le soude sur les extrémités des gaines des câbles et étire le câble formé. Application au jonctionnement de câbles de thermocouples.Method for joining shielded cables (1, 2) with compressed mineral insulator, of small diameter. A tube element (3) is used with an external diameter slightly greater than the external diameter of the sheath of the tubes, and provided with a longitudinal slot. We shrink the ends (6, 7) of the cables, then strip some of them, weld the internal conductors, put the tube element around them, reconstitute the mineral insulation powder, then compress this element of tube, weld the edges of its longitudinal slot, then weld it on the ends of the cable sheaths and stretch the cable formed. Application to the joining of thermocouple cables.

Description

La présente invention concerne un procédé de jonctionnement de câbles blindés de faible diamètre à isolant minéral comprimé, notamment de câbles de thermocouples.The present invention relates to a method of joining shielded cables of small diameter with compressed mineral insulator, in particular thermocouple cables.

Lorsque l'on veut jonctionner bout à bout des câbles blindés de ce genre, d'un diamètre de l'ordre de quelques millimètres, la soudure en bout des extrémités du ou des conducteurs intérieurs, puis des gaines, est très délicate, et il subsiste une surépaisseur au niveau de la jonction. Celle-ci peut être très gênante pour la mise en place du câble, en s'accrochant dans les orifices de passage, et constitue un point fragile susceptible d'occasionner une rupture sous l'effet d'une contrainte mécanique notable.When one wants to join end to end shielded cables of this kind, with a diameter of the order of a few millimeters, the end welding of the ends of the inner conductor (s), then of the sheaths, is very delicate, and it an extra thickness remains at the junction. This can be very annoying for the installation of the cable, by catching in the passage openings, and constitutes a fragile point capable of causing a rupture under the effect of a significant mechanical stress.

La présente invention a pour but de permettre de souder en bout deux câbles blindés à isolant minéral comprimé en évitant toute surépaisseur à l'endroit de la jonction, et en obtenant une jonction présentant une résistance mécanique peu différente de celle du câble initial ; elle a aussi pour but d'assurer la continuité des conducteurs et de maintenir les caractéristiques diélectriques des câbles initiaux.The object of the present invention is to enable two shielded cables with compressed mineral insulation to be welded to the end, avoiding any excess thickness at the junction, and obtaining a junction having a mechanical resistance little different from that of the initial cable; it also aims to ensure the continuity of the conductors and to maintain the dielectric characteristics of the initial cables.

Le procédé selon l'invention est caractérisé en ce que :

  • a) l'on prépare un élément de tube d'un diamètre externe un peu supérieur au diamètre externe de la gaine des câbles, du même métal que celle-ci, et y pratique une fente longitudinale selon un secteur compris entre deux génératrices proches l'une de l'autre ;
  • b) l'on rétreint les extrémités des câblés à jonctionner à un diamètre inférieur au diamètre interne de l'élément de tube sur une longueur un peu inférieure à la moitié de celle de l'élément de tube,
  • c) l'on dénude les extrémités des câbles sur une longueur un peu inférieure à la longueur rétreinte ;
  • d) l'on repère la ou les extrémités des conducteurs internes des câbles, les positionne bout à bout et les soude ;
  • e) l'on met en place l'élément de tube autour des extrémités des câbles, et le fixe provisoirement à celles-ci par soudure en quelques points ;
  • f) l'on introduit de l'isolant minéral en poudre à l'intérieur de l'élément de tube par sa fente, de façon à reconstituer l'isolant minéral à l'intérieur de l'élément de tube ;
  • g) l'on comprime radialement l'élément de tube de façon à rapprocher les bords de sa fente longitudinale, et ferme celle-ci par soudage ;
  • h) l'on soude ou brase définitivement les extrémités de l'élément de tube sur les gaines des câbles ;
  • i) l'on remplit les discontinuités entre les extrémités de l'élément de tube et les gaines des câbles par de la brasure. et j) l'on étire le câble formé à l'emplacement de la jonction pour l'amener au diamètre des câbles initiaux.
The method according to the invention is characterized in that:
  • a) a tube element is prepared with an external diameter slightly greater than the external diameter of the cable sheath, of the same metal as the latter, and a longitudinal slot is made therein according to a sector comprised between two close generatrices l 'one of the other;
  • b) the ends of the cables to be joined are narrowed to a diameter less than the internal diameter of the tube element over a length slightly less than half that of the tube element,
  • c) the ends of the cables are stripped over a length slightly less than the constricted length;
  • d) the end (s) of the internal conductors of the cables are identified, positioned end to end and welded;
  • e) the tube element is placed around the ends of the cables and provisionally fixed to them by welding at a few points;
  • f) powder mineral insulation is introduced inside the tube element through its slot, so as to reconstitute the mineral insulation inside the tube element;
  • g) the tube element is compressed radially so as to bring the edges of its longitudinal slot closer, and closes the latter by welding;
  • h) the ends of the tube element are permanently welded or brazed to the cable sheaths;
  • i) the discontinuities between the ends of the tube element and the cable sheaths are filled with solder. and j) the cable formed is stretched at the location of the junction to bring it to the diameter of the initial cables.

Les opérations de soudage sont effectuées de préférence à l'arc sous gaz inerte sans métal d'apporteWelding operations are preferably carried out with an arc under inert gas without filler metal

Le rétreint des extrémités des câbles à jonctionner est effectué de préférence selon un cône d'angle au sommet 20° environ.The shrinking of the ends of the cables to be joined is preferably carried out according to an angle cone at the apex approximately 20 °.

Il est décrit ci-après, à titre d'exemple et en référence à la figure unique du dessin annexé, une opération de jonctionnement selon l'invention de câbles de thermocouples du genre commercialisé par la demanderesse sous la marque "Pyrotenax".It is described below, by way of example and with reference to the single figure of the accompanying drawing, a joining operation according to the invention of thermocouple cables of the kind sold by the applicant under the brand name "Pyrotenax".

Les deux câbles à jonctionner 1 et 2, chacun de 3 mm de diamètre, comportent chacun deux conducteurs en alliage nickel-chrome et en nickel allié, une gaine en acier inoxydable et un isolant minéral formé par de la magnésie.The two cables to be joined 1 and 2, each 3 mm in diameter, each include two conductors made of nickel-chromium alloy and alloyed nickel, a sheath of stainless steel and a mineral insulator formed by magnesia.

Pour effectuer leur jonctionnemènt, on prépare un élément de tube 3 d'un diamètre un peu supérieur, par exemple 4 mm, de longueur 20 mm, que l'on fend longitudinalement entre deux génératrices espacées d'environ 1 mm (non représentées). L'on rétreint les extrémités 6, 7 des câbles à un diamètre final d'environ 1,6 mm, avec un angle de cône de rétreint 4, 5 de 20°, sur une longueur voisine de 15 mm. L'on dénude les extrémités sur 5 mm de longueur. On repère alors les extrémités correspondantes des conducteurs 8, 9, 10, 11 du thermocouple, les positionne bout à bout dans un étrier de soudage (non représenté), et les soude à l'arc sous gaz inerte avec une torche à électrode de tungstène, sans métal d'apport (soudures 12, 13).In order to join them together, a tube element 3 with a slightly larger diameter, for example 4 mm, length 20 mm, is prepared, which is split longitudinally between two generators spaced about 1 mm apart (not shown). The ends 6, 7 of the cables are shrunk to a final diameter of approximately 1.6 mm, with a shrink cone angle 4.5, of 20 °, over a length close to 15 mm. The ends are stripped over 5 mm in length. We then identify the corresponding ends of the conductors 8, 9, 10, 11 of the thermocouple, position them end to end in a welding stirrup (not shown), and arc weld them under inert gas with a tungsten electrode torch. , without filler metal (welds 12, 13).

Une fois les conducteurs soudés, on met en place l'élément de tube de jonction autour des extrémités des gaines, et le maintient provisoirement en place par pointage par soudage à l'arc sous gaz inerte. On reconstitue alors l'isolant minéral 14 dans la zone de jonction en introduisant l'isolant en poudre par la fente de l'élément de tube jusqu'à remplir celui-ci. Puis on referme la fente en exerçant sur l'élément de tube une compression radiale et en soudant ses bords à l'arc sous gaz inerte sans métal d'apport.Once the conductors are soldered, the junction tube element is put in place around the ends of the sheaths, and is temporarily held in place by pointing by arc welding under inert gas. The mineral insulation 14 is then reconstituted in the junction zone by introducing the powdered insulation through the slot of the element. of tube until filling it. Then the slot is closed by exerting on the tube element a radial compression and by welding its edges to the arc under inert gas without filler metal.

On effectue ensuite un soudage ou un brasage définitif des bords de l'élément de tube sur les gaines des câbles et on remplit les interstices subsistants avec de la brasure 15, 16.A final welding or brazing of the edges of the tube element is then carried out on the cable sheaths and the remaining gaps are filled with solder 15, 16.

On soumet enfin la zone de jonction à une passe d'étirage de façon à la calibrer au diamètre initial des câbles.Finally, the junction zone is subjected to a drawing pass so as to calibrate it to the initial diameter of the cables.

Il a été constaté sur une jonction de câble de thermocouple ainsi fabriquée une résistance à la traction d'environ 80% de celle du câble initial lorsque les extrémités de l'élément du câble étaient soudées sur les gaines des câbles, et d'environ 50% de celle du câble initial lorsqu'elles étaient brasées.It has been found on a thermocouple cable junction thus manufactured a tensile strength of approximately 80% of that of the initial cable when the ends of the cable element were welded on the sheaths of the cables, and of approximately 50 % of that of the original cable when they were brazed.

Bien que le procédé qui vient d'être décrit en référence à la figure du dessin paraisse la forme de réalisation préférable de l'invention, on comprendra que diverses modifications peuvent lui être apportées sans sortir du cadre de celle-ci, certaines opérations pouvant être remplacées par d'autres qui joueraient un rôle technique analogue. En particulier, certaines des opérations de soudage peuvent être effectuées à l'arc avec métal d'apport, ou à la torche oxyacétylénique, lorsque le métal de la gaine des câbles le permet.Although the process which has just been described with reference to the figure of the drawing appears to be the preferable embodiment of the invention, it will be understood that various modifications can be made to it without departing from the framework thereof, certain operations being able to be replaced by others that would play a similar technical role. In particular, some of the welding operations can be carried out with an arc with filler metal, or with an oxyacetylene torch, when the metal of the cable sheath allows it.

Claims (3)

1/ Procédé de jonctionnement de câbles blindés (1, 2) à isolant minéral comprimé, de faible diamètre, caractérisé en ce que : a) l'on prépare un élément de tube (3) d'un diamètre externe un peu supérieur au diamètre externe de la gaine des câbles, du même métal que celle-ci, et y pratique une fente longitudinale selon un secteur compris entre deux génératrices proches l'une de l'autre ; b) l'on rétreint les extrémités (6, 7) des câbles à jonctionner à un diamètre inférieur au diamètre interne de l'élément de tube sur une longueur un peu inférieure à la moitié de celle de l'élément de tube, c) l'on dénude les extrémités des câbles sur une longueur un peu inférieure à la longueur rétreinte ; d) l'on repère la ou les extrémités des conducteurs internes des câbles (8, 9, 10, 11), les positionne bout à bout et les soude (12, . 13); e) l'on met en place l'élément de tube autour des extrémités des câbles, et le fixe provisoirement à celles-ci par soudure en quelques points f), l'on introduit de l'isolant minéral en poudre (14) à l'intérieur de l'élément de tube par sa fente, de façon à reconstituer l'isolant minéral à l'intérieur de l'élément de tube ; g) l'on comprime radialement l'élément de tube de façon à rapprocher les bords de sa fente longitudinale, et ferme celle-ci par soudage ; h) l'on soude ou brase définitivement les extrémités de l'élément de tube sur les gaines des câbles ; i) l'on remplit les discontinuités entre les extrémités de l'élément de tube et les gaines des câbles par de la brasure (15, 16). et j) l'on étire le câble formé à l'emplacement de la jonction pour l'amener au diamètre des câbles initiaux. 1 / Method for joining shielded cables (1, 2) with compressed mineral insulator, of small diameter, characterized in that: a) a tube element (3) is prepared with an external diameter slightly greater than the external diameter of the cable sheath, of the same metal as the latter, and a longitudinal slot is made therein according to a sector between two generators close to each other; b) the ends (6, 7) of the cables to be joined are narrowed to a diameter less than the internal diameter of the tube element over a length slightly less than half that of the tube element, c) the ends of the cables are stripped over a length slightly less than the constricted length; d) the end (s) of the internal conductors of the cables (8, 9, 10, 11) are identified, positioned end to end and welded (12, 13); e) the tube element is placed around the ends of the cables, and provisionally fixed to them by welding at a few points f), powder mineral insulation (14) is introduced inside the tube element through its slot, so as to reconstitute the mineral insulation inside the tube element; g) the tube element is compressed radially so as to bring the edges of its longitudinal slot closer, and closes the latter by welding; h) the ends of the tube element are permanently welded or brazed to the cable sheaths; i) filling the discontinuities between the ends of the tube element and the cable sheaths with solder (15, 16). and j) the cable formed is stretched at the location of the junction to bring it to the diameter of the initial cables. 2/ Procédé selon la revendication 1, caractérisé en ce que les opérations de soudage sont effectuées à l'arc sous gaz inerte sans métal d'apport.2 / A method according to claim 1, characterized in that the welding operations are carried out with an arc under inert gas without filler metal. 3/ Procédé selon les revendications 1 ou 2, caractérisé en ce que le rétreint des extrémités des câbles à jonctionner est effectué selon un cône (4, 5) d'angle au sommet environ 20°.3 / A method according to claims 1 or 2, characterized in that the constriction of the ends of the cables to be joined is carried out according to a cone (4, 5) of angle at the apex about 20 °.
EP81104973A 1980-07-04 1981-06-26 Method of jointing shielded cables of small diameter insulated by a compressed mineral Expired EP0043524B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8014919A FR2486318A1 (en) 1980-07-04 1980-07-04 METHOD FOR JOINING LOW-DIAMETER SHIELDED CABLES WITH COMPRESSED MINERAL INSULATION
FR8014919 1980-07-04

Publications (2)

Publication Number Publication Date
EP0043524A1 true EP0043524A1 (en) 1982-01-13
EP0043524B1 EP0043524B1 (en) 1984-09-19

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Family Applications (1)

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EP81104973A Expired EP0043524B1 (en) 1980-07-04 1981-06-26 Method of jointing shielded cables of small diameter insulated by a compressed mineral

Country Status (8)

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US (1) US4375720A (en)
EP (1) EP0043524B1 (en)
JP (1) JPS5757472A (en)
AU (1) AU544853B2 (en)
CA (1) CA1163791A (en)
DE (1) DE3166168D1 (en)
FR (1) FR2486318A1 (en)
SU (1) SU1095890A3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2576464A1 (en) * 1985-01-18 1986-07-25 Westinghouse Electric Corp SPLICE JUNCTION SURROUNDED BY AN IMPROVED PROTECTIVE COVER

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4580874A (en) * 1983-06-27 1986-04-08 Olin Corporation Optical fiber cable repair and joining technique and kit for performing the same
US4585304A (en) * 1983-09-06 1986-04-29 Virginia Technique for repairing and joining small diameter optical fiber cables
FR2612007B1 (en) * 1987-03-03 1994-02-18 Framatome METHOD FOR CONNECTING AN ELECTRICAL CABLE WITH MINERAL INSULATION, ESPECIALLY IN THE REACTOR BUILDING OF A NUCLEAR BOILER
US6148514A (en) * 1999-04-02 2000-11-21 Beaufrand; Emmanuel Marie Eugene Method for butt-end electromechanical splicing
FR2832558A1 (en) * 2001-11-22 2003-05-23 Framatome Connectors Int Coupling sleeve for mineral insulated electric cable, has cylindrical form with wider section to slide over cable outer conductor and narrower portion to butt on to a complementary fitting
CN103460518B (en) * 2011-04-08 2016-10-26 国际壳牌研究有限公司 For connecting the adaptive joint of insulated electric conductor
CN110280881A (en) * 2019-07-18 2019-09-27 广东先导先进材料股份有限公司 A kind of thermocouple broken wire repair method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2393935A (en) * 1941-10-31 1946-01-29 Standard Telephones Cables Ltd Joint for electric power cables
GB987514A (en) * 1963-03-21 1965-03-31 Pyrotenax Ltd Improvements in or relating to joints in metal-sheathed mineral insulated electric cables
GB1031863A (en) * 1963-12-04 1966-06-02 Rosemount Eng Co Ltd Improvements in or relating to electrical conductors and their manufacture
FR2096797A2 (en) * 1970-06-29 1972-02-25 Pirelli General Cable Works
LU67219A1 (en) * 1973-03-15 1973-05-22

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Publication number Priority date Publication date Assignee Title
US3903595A (en) * 1973-07-17 1975-09-09 Fujikura Ltd Method of forming an air tight dam for communication cables

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2393935A (en) * 1941-10-31 1946-01-29 Standard Telephones Cables Ltd Joint for electric power cables
GB987514A (en) * 1963-03-21 1965-03-31 Pyrotenax Ltd Improvements in or relating to joints in metal-sheathed mineral insulated electric cables
GB1031863A (en) * 1963-12-04 1966-06-02 Rosemount Eng Co Ltd Improvements in or relating to electrical conductors and their manufacture
FR2096797A2 (en) * 1970-06-29 1972-02-25 Pirelli General Cable Works
LU67219A1 (en) * 1973-03-15 1973-05-22

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2576464A1 (en) * 1985-01-18 1986-07-25 Westinghouse Electric Corp SPLICE JUNCTION SURROUNDED BY AN IMPROVED PROTECTIVE COVER

Also Published As

Publication number Publication date
DE3166168D1 (en) 1984-10-25
AU7259481A (en) 1982-04-22
AU544853B2 (en) 1985-06-13
SU1095890A3 (en) 1984-05-30
FR2486318A1 (en) 1982-01-08
US4375720A (en) 1983-03-08
CA1163791A (en) 1984-03-20
JPS5757472A (en) 1982-04-06
EP0043524B1 (en) 1984-09-19
FR2486318B1 (en) 1982-09-03

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