FR2493057A1 - SEALED ELECTRICAL CONNECTION DEVICE BETWEEN A TELEPHONE SUBMARINE CABLE AND A REPEATER - Google Patents

Abstract

IT INCLUDES AN INSULATING OVERMOLDING 17 ARRANGED ON THE ENDS OF THE CENTRAL CONDUCTORS 11, 15 OF THE TELEPHONE CABLE AND OF THE REPEATER ACCESS CABLE AND ON THE CONNECTION PART 16 OF SAID CENTRAL CONDUCTORS, A METAL BRAID 18 BEING ADAPTED ON LEDIT 17, A OF THE ENDS OF THE BRAID BEING LINKED TO THE END OF THE RETURN CONDUCTOR 13 OF THE TELEPHONE CABLE, THE OTHER END BEING LINKED TO THE END OF THE OUTER CONDUCTOR 27 OF THE REPEATER ACCESS CABLE, A FIRST SLEEVE 24 COVERING THE LESS PART OF THE ACCESS CABLE TO THE RECEIVER AND SURROUNDING THERE IS OVERMOLDING, A SECOND SLEEVE 25 BEING ARROWED AROUND THE FIRST SO THAT A SPACE 28 IS DEFINED BETWEEN THE TWO SLEEVES. THE INVENTION IS IMPLEMENTED IN SUBMERSIBLE TELEPHONE CABLES.

Description

Watertight electrical connection device between a sub-cable

  The present invention relates to a sealed electrical connection device between a submarine telephone cable and a repeater. The submarine cables used for the transmission of a large number of telephone channels are generally of the coaxial type and comprise a number of remotely powered amplifiers or repeaters arranged at regular intervals in series with the cable and intended to compensate for the weakening of signals

  along it in the entire frequency band involved.

  It is known in particular from French Patent No. 2 402 311 for "Equipment and method for connecting submarine coaxial cables" filed September 6, 1978 in the name of International Standard Electric Co to implement in the connection devices overmolding a truncated cone polyethylene reconstituting the insulator between the line cable and the repeater access cable and a set of tubular pieces in the form of cylinders, then truncated cones, connected to each other by welding, ensuring the electrical connection between the driver back in

  aluminum line cable and copper braid of the access cable.

  However, the transition from aluminum to copper requires the use of an intermediate piece of zinc to avoid corrosion due to potential differences between metals, and secondly welds made

  polyethylene insulation in an area where it is particularly

  thin, may damage this one. Such a structure

  nevertheless requires a large number of operations and parts.

  The present invention proposes to overcome the disadvantages

previously mentioned.

  The purpose of the invention is therefore to provide a device for the sealed electrical connection between a submarine telephone cable and a repeater, the said submarine telephone cable comprising a central conductor and a return conductor separated by means of an insulating material, a cable said repeater access cable being connected to the latter, and comprising a central conductor and an outer conductor separated by an insulating material, said central conductors being joined by a conductive connecting piece, an overmolding of an insulating material being disposed on the ends of said central conductors and said connecting piece, characterized in that it comprises a metal braid adapted to said overmoulding, one end of said braid being connected to the end of the cable return conductor of line, the other end being connected to the end of the outer conductor of the access cable to the repeater r, a first sleeve covering at least in part the access cable to the repeater, and surrounding said overmolding, a second sleeve being arranged around the first so that a

  space is defined between the two sleeves.

  Other features and advantages of the invention will emerge

  of the following description given as a purely illustrative example

  but in no way limiting with reference to FIGS. 1, 1A and 1B

  which represent an embodiment of the invention.

  In the appended figures reference 11 denotes the central conductor of the telephone line cable while the reference

  is assigned to the central conductor of the repeater access cable.

  These conductors are joined by brazing to a connecting piece 16.

  The reference 13 designates the return conductor of the line cable formed of an edge-to-edge longitudinal strip, this return conductor being isolated from the central conductor by a

insulating material 12.

  Said return conductor 13 is itself covered by

  extrusion of a polyethylene protective sheath 14.

  In addition, an overmoulding in the form of a layer of polyethylene

  thylene 17 having a gyrating profile whose diameter decreases from the end of the central conductor of the line cable to the end of the central conductor of the repeater access cable is overmolded on the connecting piece 16 and on the ends

central conductors 11 and 15.

  The reference 18 designates an aluminum braid disposed on the ogival layer 17, and fitted thereon during assembly; this braid 18 is glued by one of its ends at 19 on the end of the return conductor 13 of the cable, while its other end is brazed at 20 on the end of the outer conductor 27 of the cable of the cable. access to the repeater, said external conductor

  may be formed of a copper braid.

  In addition, a layer of polyethylene 21 is injected onto a portion of the braid 18 covering the ogival layer 17 and it covers the end of the sheath 14 protecting the return conductor 13 of the line cable, the other end of this layer

  coming substantially at the level of the connecting piece 16.

  This layer 21 is provided substantially at the rear portion of the ogival layer 17 with circular projections such as 22 and 23 on which are fitted two neoprene sleeves, a first sleeve 24 which covers a portion of the cable access to the repeater, and a second outer sleeve 25, a space 28

  thus being defined between said sleeves.

  The sleeve 25 has on the one hand a front opening 29 through which opens out towards the outside in a sealed manner.

  repeater 15 access cable, and on the other hand a filling port

  wise 30 that can be closed by a plug. This orifice 30 is intended to allow the filling of the space 28 between the two sleeves in a hydrophobic sealing material such as polyisobutylene capable of preventing any accidental water intrusion in the braze 20, the braid 20 aluminum 18 and copper braid 27 in particular. This material also ensures the filling of the space 35 between the layer 17 and the sleeve 24 via channels 36 formed in the sleeve 24, according to a technique described in French Patent No. 992,301 for "Improvements to equipment operating under pressure, especially for telephone receivers

  submarines "filed June 13, 1944 in the name of Paul MARTIN.

  The connection device according to the present invention

a number of advantages.

  In particular the use of an aluminum braid 18 slipped and stretched on the ogival layer 17 during assembly and then glued to the end of the return conductor 13 of the line cable and finally stretched so that it comes fit tightly

  on layer 17 until reaching the end of the outer

  27 of the access cable to the repeater 15 to which it is connected by a solder 20, ensures a perfect seal and -4-

  to avoid any subsequent corrosion ..

  Indeed, because of its perforated structure, the braid lets the polyethylene melt between its strands during the molding of the layer 21; this polyethylene adheres directly to the polyethylene layer 17, and during its cooling, it traps the braid son forming a compact block

and free from any inclusion of air.

  Furthermore, in the device according to the invention, only inexpensive parts are used and it also provides

  best continuity impedance / frequency.

  It is also very easily achievable at an industrial level.

  The invention is implemented in all submerged telephone cables. Although the device which has just been described appears most advantageous for the implementation of the invention in a

  particular technical situation, it will be understood that various modifications

  may be made without departing from the scope of the invention,

  some of its elements may be replaced by others

  to perform the same technical function or a technical function.

equivalent.

  In particular, the braid of the access cable may be of aluminum and the diameter of the wire, the number of threads per spindle, the number of spindles and the pitch of braiding may be chosen such that this braid may be turned back during molding of the ogival layer 17 to be then returned directly to the driver

  return of the cable 13 and glued as previously in 19.

  The brazed junction 20 can be suppressed and moreover, since there is no risk of differential corrosion by different metals, the layer 21 can be extended to the top of the sheath of the access cable without the risk of failure. sealing the weld with this sheath can threaten the longevity of the reconstitution

  of the return conductor by electroerosion.

  In this case, the sleeves 24 and 25 may be optionally removed. -5-

Claims (6)

  1 / device for sealing electrical connection between a submarine telephone cable and a repeater, said underwater telephone cable comprising a central conductor and a return conductor separated by means of an insulating material, a cable said access cable to the repeater being connected to the latter, and comprising a central conductor and an outer conductor separated by an insulating material, said central conductors being joined by a conductive connecting piece, an overmolding of an insulating material being disposed on the ends of said central conductors and said part linkage, characterized in that it comprises   a metal braid adapted to said overmoulding, one of the ends   of said braid being connected to the end of the return conductor of the line cable, the other end being connected to the end of the outer conductor of the repeater access cable, a first sleeve covering at least partially the repeater access cable, and surrounding said overmolding, a second sleeve being arranged around the first so that a space is defined between the two sleeves.   2 / Apparatus according to claim 1, characterized in that said overmolding has an ogival shape whose diameter decreases from the end of the central conductor of the line cable   towards the end of the central conductor of the repeater access cable.   3 / Apparatus according to one of claims 1 or 2, characterized   in that the metal braid is connected to the return conductor of the line cable by gluing, and to the outer conductor   repeater solder access cable.   4 / Apparatus according to one of claims 1 to 3, characterized   in that it comprises a layer of insulating material in particular   of polyethylene injected onto at least a portion of the metal braid   lique, one of the ends of this layer coming substantially at the connecting piece, while its other end comes to cover the end of a protective sheath of the driver back of the line cable.   5 / Apparatus according to one of claims I to 4, characterized   in that said layer of insulating material comprises substantially 6 - at the rear portion of the ogival layer protrusions   able to anchor said first and second sleeves.   6 / Apparatus according to one of claims 1 to 5, characterized   in that the space defined between said first and second sleeves and the space defined between said ogival layer and said first sleeve is filled with a sealing material   hydrophobic, especially polyisobutylene.