EP0058112B1 - Revêtement destiné à assurer le centrage d'une âme de câble dans son enveloppe, câble comportant un tel dispositif, et son procédé de fabrication - Google Patents

Revêtement destiné à assurer le centrage d'une âme de câble dans son enveloppe, câble comportant un tel dispositif, et son procédé de fabrication Download PDF

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Publication number
EP0058112B1
EP0058112B1 EP19820400168 EP82400168A EP0058112B1 EP 0058112 B1 EP0058112 B1 EP 0058112B1 EP 19820400168 EP19820400168 EP 19820400168 EP 82400168 A EP82400168 A EP 82400168A EP 0058112 B1 EP0058112 B1 EP 0058112B1
Authority
EP
European Patent Office
Prior art keywords
cable
core
covering
fin
envelope
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.)
Expired
Application number
EP19820400168
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0058112A2 (fr
EP0058112A3 (en
Inventor
Jean-Pierre Hulin
Jean-Claude Staath
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.)
Lignes Telegraphiques et Telephoniques LTT SA
Original Assignee
Lignes Telegraphiques et Telephoniques LTT SA
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 Lignes Telegraphiques et Telephoniques LTT SA filed Critical Lignes Telegraphiques et Telephoniques LTT SA
Publication of EP0058112A2 publication Critical patent/EP0058112A2/fr
Publication of EP0058112A3 publication Critical patent/EP0058112A3/fr
Application granted granted Critical
Publication of EP0058112B1 publication Critical patent/EP0058112B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H01B13/10—Insulating conductors or cables by longitudinal lapping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring

Definitions

  • the present invention relates to a coating intended to ensure the centering of a cable core in its envelope, a cable comprising such a device and its manufacturing process.
  • French patent 1,593,816 filed by the Applicant describes a cable comprising a core with multiple conductors, coated with a plastic sheath provided with longitudinal or helical fins, and a corrugated metal envelope tightened at the ends. bearing fins.
  • the fin sheath obtained by extrusion, serves both as a heat shield and as a coating ensuring centering by locking the core of the cable relative to its envelope.
  • German patent 937172 describes a coating or conductive sheath comprising fins made of a material having a certain elasticity.
  • English patent 918794 describes a coaxial cable comprising an inner conductor or core, an outer conductor or envelope, and a sheath obtained by bringing the edges of several ribbons in coincidence over a given width around the core and by joining the edges together over part of their width so as to produce elastic fins.
  • the envelope is tightened on the bearing ends of the fins, thus achieving a locking between the core and the envelope to obtain a rigorous coaxiality between the core of the cable and its envelope.
  • the invention therefore aims to solve this problem by providing a coating which ensures satisfactory centering of a cable core in its envelope and which at the same time ensures that an extra length of the core is obtained inside. of the envelope.
  • the coating intended to ensure the centering of a cable core in its envelope and comprising at least one elastic fin is characterized in that the fin is of periodically variable height.
  • the variation in depth of the fin (s) will make it possible to have an extra length of the core of the cable inside the envelope, the core of the cable with its covering of fins being positioned in a helix due to the variation. of the depth of the fins, and therefore around an average position corresponding to centering.
  • the pull on the envelope will produce a slight elongation thereof (for example of the order of 0.5%), which means that after unwinding, the lengths of the envelope and the soul will be equal.
  • the invention also relates to a method of manufacturing a cable comprising a device for centering its core, consisting in forming a coating by bringing the edges of at least one ribbon in coincidence over a given width around the core of the cable. , to join together the edges over at least part of the width so as to produce at least one elastic fin, and to have an envelope around the covering, characterized in that the given width is periodically variable, so as to vary the height of the fin.
  • FIG. 1 represents a cable of the type described in the aforementioned German patent 937172. It comprises a core 1 coated with ribbons 2 made of plastic material and of a sheath 3 also made of plastic material provided with longitudinal fins 4 or in a very long pitch helix, called to delimit empty spaces 6 between the sheath 3 and its envelope metallic.
  • the metal casing 5 is tightened fairly tightly on the bearing ends of the fins 4 so as to prevent the cable from slipping inside its casing.
  • this rigid anchoring does not provide satisfactory centering, because it transmits to the core of the cable all the stresses to which the envelope is subjected during the unwinding and winding of the cable or when the cable is in operation.
  • FIG. 2 represents a cable according to the invention, the core 7 of which is surrounded by a coating 8 provided with elastic fins 10 and an envelope 12 possibly corrugated. Spaces 11 remain between the covering 8 and the casing 12 and the fins 10 have a height p at least equal to the dimension of the spaces 11 in a radial direction, hereinafter referred to as depth, which corresponds to the play existing between the core of the cable and its envelope.
  • the centering of the core with respect to the envelope is not a centering imposed by a mechanical blocking, but a self-centering which is achieved by the elastic recovery of the fins 10 when they are moved away from a state of balanced.
  • the self-centering of the core thereof avoids constraints due to the winding or unwinding lengths which would be different for an off-center core and envelope .
  • the connection between the core and its envelope is achieved simply by the friction forces between the fins and the internal face of the envelope, the mechanical and / or thermal stresses to which the envelope is susceptible to be submitted to the operating site will result in a relative translation of the envelope and the core without, however, this being subject to constraints. Indeed, the only forces present in practice are those corresponding to the friction of the core with respect to the envelope or to an ovalization of the envelope, and the stresses which result therefrom are almost entirely absorbed by the fin (s).
  • a polypropylene covering 0.2 mm thick and fins 0.4 mm in diameter have been used. thickness and 1 mm in height, this height being at least equal to the depth of the spaces 11.
  • the respective thicknesses of a coating of high density polyethylene and fins are, for example, 0.1 mm and 0.2 mm and on the other hand the height of the fins is 0.4 mm.
  • the clearance existing between the core of the cable and its envelope is generally determined by the maximum ovalization to which the envelope is likely to be subjected during the use of the cable or by the average clearance required between the core of the cable and its envelope, which makes it possible to determine the minimum height of the fins.
  • the definition of the maximum tolerated eccentricity then makes it possible to choose the nature of the material of the fins according to its modulus of elasticity E as well as the thickness of the fins so that the weight of the core produces at rest only one offset less than the maximum tolerated offset.
  • the frictional forces between the covering fin (s) and the cable envelope are sufficient to prevent relative sliding of the core and the envelope when the cable is vertical, and / or in presence of vibrations when the cable is laid.
  • the height of the fin (s) will be chosen greater than the clearance existing between the core of the cable and its envelope so that the fin (s) 10 "(FIG. 4 b ) have an initial deformation, with or without prestressing during the installation of the envelope, thus creating in the first case a prestressing force increasing the friction (the folding of the fins has been exaggerated in FIG. 4 b ).
  • fins of section other than rectangular in order to obtain a structure of equal resistance, for example by extrusion. It is thus possible to use fins with a truncated parabolic profile or else with a trapezoidal profile. The calculation is then done according to the same laws.
  • FIG. 3 illustrates a method of manufacturing a coating according to the invention, in which ribbons 18 disposed on coils 14, here 4 in number, distributed around the core 7 to be coated, are brought into coincidence on their edges, over a width corresponding to the desired height for the fins, their edges then being welded at this level.
  • the core is animated by an axial translational movement along arrow F and the ribbons 18 see their edges brought into contact at 21 as they unfold, at the level of grooves 20 formed on the face internal of a guide cylinder 19, the axis of which is the axis of movement of the core 7.
  • heads or pairs of welding heads are arranged which weld the portions of ribbon brought into contact by the grooves 20, thus producing the fins 10.
  • the cylinder 19 is replaced by pairs of rollers with axes parallel to the axis of movement of the core 7 of the cable, and which are spaced so as to pinch two thicknesses of ribbons 18.
  • pairs of rollers will be used per fin 10 and the tape portions will be welded between the two pairs of rollers.
  • a covering 8 made from ribbons welded at their edges will have the shape shown in FIG. 2, that is to say that the edges of the ribbon 18 are integral on a thinner part corresponding to approximately two thicknesses of the ribbon up to 'to a projecting portion forming a thicker portion 9 which has a diameter slightly greater than the average diameter of the coating 8.
  • a covering 8 provided with elastic fins 10 can be produced by extrusion in a extruder through a head whose profile. corresponds to that of the coating 8.
  • FIG. 4a there is shown in partial section a coating 8 produced by extrusion and comprising fins 10 'profiled from a wide portion 22, which connect them to the cylindrical contour of the coating, up to to a narrow portion 23 at their ends, for example according to a truncated or trapezoidal parabolic profile.
  • the fins 10 can be longitudinal. They can also be helical or with alternating pitch: in the case of manufacture from strips, all of the coils 14 and the guide cylinder 19, or the pairs of rollers, will be driven by a corresponding movement around the axis of movement of the core 7; or else the core 7 will be rotated about its axis of movement, for example by rotating a coil which receives it and / or a reel which delivers it, around an axis perpendicular to its longitudinal axis. In the case of manufacture by extrusion, the extrusion apparatus will be rotated or else, as mentioned above, the core of the cable.
  • the centering of the cable in its envelope can be carried out using an envelope provided with a single fin, preferably helical or with alternating pitch.
  • a propeller or an alternating pitch will have a fairly short pitch, for example of the order of magnitude of the coating diameter, so that the eccentricity of the cable core, which will be compensated at worst half a step further by the elastic recovery of the fin, is corrected effectively.
  • the space or play existing between the cylindrical part of the covering 8 and the casing 12 is greater than the space or play which is tolerated between the core d 'a cable and its outer casing in cable technology in general, and in particular in the case of a cable as described in French patent 1,593,816. This greater play is used for self-centering than allows the coating according to the invention.
  • the depth of the fin (s) is periodically variable between a maximum value and a minimum value, this variation being out of phase in the case of several fins.
  • the drums 14 are mounted on an eccentric, the eccentricity of which corresponds to the amplitude of variation of the depth of the fins and the speed of rotation of which will define the pitch of the variation, in relation to the speed of travel of the cable core.
  • a extruder will be used provided with a variable extrusion profile at the level of the fins, the variation being controlled for example by an eccentric.
  • the invention is not limited to the embodiments described above. Thus, it is not necessary that the fins are made of the same material as the cylindrical part of the covering 8. On the other hand, the fins, whether or not made of the same material as the covering 8 in its cylindrical part, can be reinforced by one or more elastic ribbons.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulated Conductors (AREA)
  • Manufacturing Of Electric Cables (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
EP19820400168 1981-02-06 1982-01-29 Revêtement destiné à assurer le centrage d'une âme de câble dans son enveloppe, câble comportant un tel dispositif, et son procédé de fabrication Expired EP0058112B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8102413 1981-02-06
FR8102413A FR2499757A1 (fr) 1981-02-06 1981-02-06 Revetement destine a assurer le centrage d'une ame de cable dans son enveloppe, cable comportant un tel dispositif et son procede de fabrication

Publications (3)

Publication Number Publication Date
EP0058112A2 EP0058112A2 (fr) 1982-08-18
EP0058112A3 EP0058112A3 (en) 1982-09-08
EP0058112B1 true EP0058112B1 (fr) 1985-10-09

Family

ID=9254939

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820400168 Expired EP0058112B1 (fr) 1981-02-06 1982-01-29 Revêtement destiné à assurer le centrage d'une âme de câble dans son enveloppe, câble comportant un tel dispositif, et son procédé de fabrication

Country Status (5)

Country Link
EP (1) EP0058112B1 (enrdf_load_stackoverflow)
JP (1) JPS57151904A (enrdf_load_stackoverflow)
CA (1) CA1188137A (enrdf_load_stackoverflow)
DE (1) DE3266727D1 (enrdf_load_stackoverflow)
FR (1) FR2499757A1 (enrdf_load_stackoverflow)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE427707A (enrdf_load_stackoverflow) * 1937-04-30
DE937172C (de) * 1952-10-22 1955-12-29 Hirschmann Richard Fa Fuehrungskoerper zur Fuehrung von Hochfrequenz-Bandkabeln in Rohren
GB918794A (en) * 1960-07-04 1963-02-20 Raymond Charles Mildner Improvements in or relating to co-axial cables
DE2421173A1 (de) * 1974-05-02 1975-11-20 Kabel Metallwerke Ghh Koaxiales hochfrequenzkabel

Also Published As

Publication number Publication date
EP0058112A2 (fr) 1982-08-18
FR2499757A1 (fr) 1982-08-13
FR2499757B1 (enrdf_load_stackoverflow) 1983-09-09
JPS57151904A (en) 1982-09-20
CA1188137A (en) 1985-06-04
DE3266727D1 (en) 1985-11-14
EP0058112A3 (en) 1982-09-08

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