EP1630829B1 - Dispositif de fabrication d'une gaine alvéolée autour d'un conducteur - Google Patents

Dispositif de fabrication d'une gaine alvéolée autour d'un conducteur Download PDF

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Publication number
EP1630829B1
EP1630829B1 EP05300689A EP05300689A EP1630829B1 EP 1630829 B1 EP1630829 B1 EP 1630829B1 EP 05300689 A EP05300689 A EP 05300689A EP 05300689 A EP05300689 A EP 05300689A EP 1630829 B1 EP1630829 B1 EP 1630829B1
Authority
EP
European Patent Office
Prior art keywords
sleeve
guide
intended
central
central guide
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.)
Not-in-force
Application number
EP05300689A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1630829A1 (fr
Inventor
Jean-François Guinot
Pascal Clouet
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.)
Nexans SA
Original Assignee
Nexans 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 Nexans SA filed Critical Nexans SA
Publication of EP1630829A1 publication Critical patent/EP1630829A1/fr
Application granted granted Critical
Publication of EP1630829B1 publication Critical patent/EP1630829B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01B13/14—Insulating conductors or cables by extrusion
    • H01B13/142—Insulating conductors or cables by extrusion of cellular material
    • 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
    • H01B7/02—Disposition of insulation
    • 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
    • H01B13/14—Insulating conductors or cables by extrusion
    • H01B13/143—Insulating conductors or cables by extrusion with a special opening of the extrusion head
    • 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
    • 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
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/5313—Means to assemble electrical device
    • Y10T29/532—Conductor

Definitions

  • the present invention relates to a method and a device for manufacturing a cellular sheath of a conductor. It relates more particularly, but without limitation, to the manufacture of intermediate dielectric sheaths of coaxial cables.
  • FIG. 1 illustrates an example of a coaxial cable according to the prior art.
  • the coaxial cable 10 generally comprises a central conductor 4 surrounded by an intermediate sheath 5, or insulation, made of an insulating dielectric material.
  • the central conductor 4 may for example be solid or in the form of a strand, as shown in FIG. 1.
  • the intermediate sheath must have specific dielectric properties in order to obtain the required attenuation characteristics for the coaxial cable, especially for relatively high frequencies. Specifically, it is generally required that the intermediate sheath has a dielectric constant less than about 1.8, and as close as possible to 1. The higher the dielectric constant is close to 1, the higher the coaxial cable can be used.
  • the dielectric constants of the insulating materials conventionally used in cabling for example polyethylene or polytetrafluoroethylene (PTFE), have a value close to 2 when these insulating materials are used in a massive form.
  • PTFE polytetrafluoroethylene
  • the cellular sheaths are made of an insulating material comprising a plurality of air-filled bubbles or a dielectric constant gas close to 1, so that the dielectric constant of the cellular sheath is lower than the dielectric constant of the material. insulation alone.
  • the cellular sheaths have cells extending rectilinearly or helically along the coaxial cable. As shown in FIG. 1, walls 53, 51 and 54 make it possible to separate the cells 52 from each other, the central conductor 4, and the outer protective sheath 7.
  • the cells may have various shapes.
  • the cells can be closed, as shown in Figure 1, that is to say that each cell is completely surrounded by walls of insulating material.
  • the cells can also lead directly to the driver.
  • the cells are obtained by shaping the insulating material used, with the aid of an extrusion device having suitable openings and passages for this purpose.
  • the European patent EP 0 803 878 describes a method and a device for manufacturing such a cellular sheath.
  • the manufacturing device comprises a central guide comprising a longitudinal channel for the passage of a conductor.
  • the manufacturing device also includes a coaxial die surrounding the central guide.
  • An outer surface of the central guide and an inner surface of the die define a passage for an insulating material in the viscous state.
  • the die comprises openings communicating with the passage.
  • the openings are intended to receive the insulating material in the viscous state, and have a shape adapted to allow the formation of cells.
  • the insulating material is thus shaped by extrusion and then applied to the conductor at a distance from the die such as the material insulation is sufficiently stretched so that the walls of the cells do not collapse under the effect of the depression at the exit of the die.
  • the die comprises several openings, so as to allow the formation of a number of cells typically between 4 and 6.
  • a given die is therefore associated with a given geometry of the honeycomb sheath.
  • the coaxial cable manufacturing device makes it easier to manufacture coaxial cables having honeycomb sheaths of various geometries with the same manufacturing device.
  • the present invention relates to a device for manufacturing a cellular sheath of an insulating material around a conductor.
  • the manufacturing device comprises a central guide comprising a longitudinal channel for receiving the driver.
  • the manufacturing device also comprises a peripheral guide.
  • An inner surface of the peripheral guide and an outer surface of the central guide define a passage for receiving said insulating material in a viscous state.
  • the manufacturing device further comprises a sleeve separate from the central guide and the peripheral guide. At least a portion of the sleeve is intended to be interposed between the central guide and the peripheral guide and comprises at least one opening opening on the central guide on the one hand and the peripheral guide on the other.
  • the manufacturing device according to the present invention thus offers a greater modularity than the devices according to the prior art.
  • Each opening of the sleeve communicates with the passage and is therefore also intended to receive insulating material in the viscous state, so as to form a wall of insulating material.
  • the sleeve advantageously comprises several openings, so as to form several walls separating several cells from each other.
  • the sleeve comprises a single opening.
  • an outer surface of the sleeve and the inner surface of the peripheral guide define a peripheral path for receiving the insulating material in the viscous state, so that the cells thus formed are separated from a sheath at least one peripheral wall corresponding to the peripheral path.
  • An inner surface of the sleeve and the outer surface of the central guide advantageously define a central path for receiving the insulating material in the viscous state, when the sleeve is interposed between the central guide and the peripheral guide.
  • the insulating material in the viscous state received in the central path thus forms an insulating central wall at least one cell of the conductor.
  • the cells thus formed are closed.
  • the sleeve may have dimensions such that when the sleeve is at least partially interposed between the central guide and the peripheral guide, the inner surface of the sleeve and the outer surface of the central guide are sufficiently close together so that the insulating material to the Viscous state does not interfere between the sleeve and the central guide.
  • a sleeve makes it possible to manufacture coaxial cables in which the cells of the cellular sheath open directly onto the conductor.
  • the sleeve can have various shapes.
  • the sleeve comprises several radial openings, so as to form radial walls separating the cells from each other.
  • Such a dimpled sheath will roughly have a bicycle wheel shape.
  • the sleeves according to the present invention are relatively easier to manufacture than the dies of the prior art.
  • the sleeve may comprise a central piece and a coaxial peripheral piece.
  • An outer surface of the center piece and an inner surface of the peripheral piece define an intermediate path.
  • the central piece and the peripheral piece each comprise at least one radial opening, and preferably several.
  • the radial openings of the central part open on the central guide on the one hand and on the peripheral part on the other.
  • the radial openings of the peripheral part open on the central part on the one hand and on the peripheral guide on the other.
  • the intermediate path, the radial openings of the central piece and the radial openings of the peripheral piece are thus intended to receive insulating material in the viscous state, so as to form two layers of cells.
  • the cells are separated from each other by an intermediate wall corresponding to the intermediate path, and by radial walls corresponding to the radial openings of the central part and the peripheral part, thus forming a so-called double-layered duct.
  • the present invention is not limited by the number of cell layers of the dimpled sheath.
  • the sleeve may comprise a plurality of non-rectilinear openings and intersecting each other, so that the cells thus formed have a substantially shape hexagon or hexagon portion.
  • honeycomb sheath is called honeycomb.
  • the device for manufacturing the cellular sheath may comprise more than one central guide, so that the coaxial cable thus manufactured comprises, for example, two substantially parallel conductors.
  • the manufacturing device may comprise a single peripheral guide.
  • the passage is defined by the outer surfaces of the central guides and the inner surface of the peripheral guide.
  • the sleeve has a shape adapted to receive the central guides, so as to be interposed between the central guides and the peripheral guide.
  • the sleeve comprises at least one opening opening on one of the central guides and on the peripheral guide.
  • the sleeve may also include a path opening on both sides on the central guides.
  • the present invention is not limited by the number, shape, or arrangement of the sleeve opening (s), or by the shape of the sleeve itself.
  • the sleeve may be relatively slowly rotated about a longitudinal axis, and relative to the central guide, so as to form a cellular sheath having cells extending helically along the coaxial cable.
  • the sleeve is preferably not rotated about the longitudinal axis, so as to form cells extending rectilinearly along the coaxial cable.
  • the manufacturing device advantageously comprises a vacuum chamber intended to communicate on the one hand with a suction pipe, and on the other hand with the longitudinal channel of the central guide, so that at the exit of the guide central, the insulating material is applied against the driver.
  • the vacuum chamber provides a vacuum at the outlet of the central guide, under the effect of which the central wall is applied against the driver.
  • the present invention is however not limited by the presence of the vacuum chamber, nor by any suction method to ensure a vacuum at the outlet of the central guide.
  • the sleeve preferably comprises at least one vent extending longitudinally, and for at least partially balancing the pressures between each end of the sleeve.
  • the sleeve conventionally comprises as many vents as radial openings, so that the pressure at the outlet of the sleeve in each cell is relatively high.
  • the vents thus make it possible to avoid a collapse of the walls of the cells under the effect of the depression.
  • the present invention is of course not limited by the presence of vents.
  • the insulating material shaped by extrusion can be applied to the conductor at a distance such that the insulating material is relatively stretched and cooled.
  • the manufacturing device advantageously comprises a pressure chamber intended to communicate on the one hand with a blowing pipe, and on the other hand with each vent.
  • the booster chamber provides an overpressure inside the cells to prevent collapse of the walls of the cells.
  • the present invention is of course not limited by the presence of the pressure chamber, nor by any blowing process inside the cells.
  • the vacuum chamber and the booster chamber are advantageously intended to be arranged in a longitudinal axis of the manufacturing device.
  • the manufacturing device further comprises a rod comprising a vacuum channel intended to open on the one hand on the vacuum chamber, and on the other hand on the longitudinal channel of the central guide.
  • Such a device for manufacturing a cellular sheath is relatively compact and extends in a longitudinal direction.
  • the cane ensures sealing between the parts of the manufacturing device communicating with the pressure chamber and the parts of the manufacturing device communicating with the vacuum chamber.
  • the vacuum chamber and the booster chamber are advantageously releasably fixed, for example by interlocking, so that a user can easily assemble and disassemble the manufacturing device.
  • the present invention is of course not limited by the positioning of the vacuum chamber and the booster chamber, nor by the manner in which the seal is guaranteed.
  • a manufacturing device comprising the rod has the advantage of being relatively easy to assemble and / or disassemble.
  • the booster chamber is advantageously placed between the vacuum chamber and a head of the manufacturing device comprising the central guide.
  • the cane advantageously crosses the pressure chamber.
  • the vacuum chamber is placed between the pressure chamber and the head of the manufacturing device.
  • the present invention also relates to a device for manufacturing a cellular sheath around a conductor.
  • the device manufacturing comprises a central guide comprising a longitudinal channel for receiving the conductor, and shaping means intended to be arranged around the central guide.
  • the forming means comprise at least one opening intended to receive insulating material in a viscous state, and at least one solid part intended to form at least one cell. Each solid part includes a vent.
  • the manufacturing device further comprises a vacuum chamber and a booster chamber.
  • the vacuum chamber is intended to communicate on the one hand with a suction pipe, and on the other hand with the longitudinal channel, so that at the outlet of the central guide, the insulating material is applied against the driver.
  • the booster chamber is intended to communicate on the one hand with a blow pipe, and on the other hand with each vent.
  • the vacuum chamber and the booster chamber are intended to be arranged in a longitudinal axis of the manufacturing device.
  • the manufacturing device further comprises a rod comprising a vacuum channel intended to open on the one hand on the vacuum chamber, and on the other hand on the longitudinal channel of the central guide.
  • Such a device associating suction and blowing, respectively at the exit of the central guide and at the exit of the shaping means, makes it possible to guarantee the adhesion of the insulating material to the conductor and to prevent the cells from sinking. That is to say that this manufacturing device makes it possible to control the behavior of the insulating material at the outlet of the central guide and at the outlet of the shaping means.
  • the rod allows positioning of the vacuum chamber and the suction chamber in the longitudinal axis.
  • the vacuum chamber and the booster chamber are typically arranged one behind the other, the rod to ensure sealing.
  • the shaping means may comprise a peripheral guide and a sleeve.
  • Part of the sleeve is intended to be interposed between the central guide and the peripheral guide and comprises the solid part (s) intended to form the cell (s), as well as one or more openings intended to receive the insulating material in the viscous state.
  • the insulating material in the viscous state is also received in a peripheral path between the peripheral guide and the sleeve, and possibly in a central path between the sleeve and the central guide.
  • the shaping means comprise a die having the opening or openings for receiving the insulating material in the viscous state.
  • the present invention also relates to a method of manufacturing a cellular sheath around a conductor implementing the manufacturing device according to the invention.
  • the method according to the invention comprises a suction step at the suction pipe, and a blowing step at the blow pipe, the suction step and the blowing step taking place together.
  • FIG. 2 is a view of a section of an exemplary device for manufacturing a cellular sheath according to a preferred embodiment of the present invention.
  • Figure 3 is a sectional view of an example of a device for manufacturing a cellular sheath according to the preferred embodiment of the present invention.
  • Fig. 4 is a detailed view of a portion of an example of a second sleeve according to the preferred embodiment of the present invention.
  • a device 11 for manufacturing a cellular sheath comprises a central guide 12 and a peripheral guide 13.
  • the central guide 12 comprises a longitudinal channel 17 intended to receive a driver not shown on the Figures 2 and 3.
  • An outer surface of the central guide 12 and an inner surface of the peripheral guide 13 define a passage 14 for receiving an insulating material in a viscous state.
  • the manufacturing device 11 also comprises a first sleeve 15a, part of which is intended to be interposed between the central guide 12 and the peripheral guide 13.
  • the first sleeve 15a comprises, in the preferred embodiment of the present invention, eight radial openings 16 opening on the one hand on the central guide 12, and on the other on the peripheral guide 13.
  • the inner surface of the peripheral guide 13 and an outer surface of the first sleeve 15a define a peripheral path 18 for receiving the insulating material in the viscous state, so as to form a peripheral wall of the cellular sheath.
  • An inner surface of the first sleeve 15a and the outer surface of the central guide 12 define a central path 19 for receiving the insulating material in the viscous state, so as to form a central wall of the honeycomb sheath.
  • Such a first sleeve 15a thus makes it possible to manufacture a cellular sheath with eight closed cells.
  • a second sleeve 15b may for example be used.
  • the second sleeve 15b has a shape generally similar to the shape of the first sleeve 15a, but has a number of radial openings 16 distinct, so that the second sleeve 15b allows to manufacture a honeycomb sheath five cells only.
  • the first sleeve 15a and the second sleeve 15b are traversed by the radial openings 16 only on a portion, typically substantially on the part intended to be effectively inserted between the central guide 13 and the peripheral guide 13.
  • the manufacturing device 11 comprises two supply ducts 20 intended to receive the insulating material in the viscous state, and to guide the insulating material towards the passage 14.
  • the insulating material in the viscous state then interferes with the peripheral path 18 of the passage 14, the radial openings 16 and the central path 19, so as to form the honeycomb sheath.
  • the manufacturing device 11 comprises a pressure chamber 21 and a vacuum chamber 22 intended to be arranged in a longitudinal axis X of the manufacturing device 11.
  • the booster chamber 21 comprises a blowing duct 23 intended to communicate with a first fitting 31, so that the booster chamber 21 can communicate with a not shown blowing duct.
  • the vacuum chamber 22 includes a suction duct 24 for communicating with a second connector 32, so that the vacuum chamber 22 can communicate with a suction pipe not shown.
  • the first sleeve 15a and the second sleeve 15b comprise longitudinally extending vents 25.
  • the booster chamber 21 is designed to communicate with each vent 25.
  • the gas inside each cell formed by the insulating material at the outlet of the sleeve thus has a pressure high enough that the cells do not collapse, now the geometry of the honeycomb sheath.
  • the vacuum chamber 22 is intended to communicate with the longitudinal channel 17.
  • the pressure around the conductor at the outlet of the central guide 12 is small enough so that the central wall of the the formed honeycomb sheath adheres to the conductor.
  • a rod 26 makes it possible to guarantee the seal between the parts of the manufacturing device 11 communicating with the pressure chamber 21 and the parts of the manufacturing device communicating with the vacuum chamber 22.
  • the rod 26 comprises a depression channel 27 intended to open on the one hand on the vacuum chamber 22, and on the other hand on the longitudinal channel 17 of the central guide 12.
  • the rod 26 passes through the pressure chamber 21.
  • the vacuum chamber 22, the booster chamber 21 and the rod 26 are removably attached, so that a user can easily assemble and disassemble the manufacturing device 11.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulated Conductors (AREA)
  • Insulating Bodies (AREA)
  • Waveguides (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Forging (AREA)
  • Body Structure For Vehicles (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Communication Cables (AREA)
EP05300689A 2004-08-27 2005-08-23 Dispositif de fabrication d'une gaine alvéolée autour d'un conducteur Not-in-force EP1630829B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0451926A FR2874736B1 (fr) 2004-08-27 2004-08-27 Dispositif de fabrication d'une gaine alveolee autour d'un conducteur

Publications (2)

Publication Number Publication Date
EP1630829A1 EP1630829A1 (fr) 2006-03-01
EP1630829B1 true EP1630829B1 (fr) 2007-07-04

Family

ID=34949166

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05300689A Not-in-force EP1630829B1 (fr) 2004-08-27 2005-08-23 Dispositif de fabrication d'une gaine alvéolée autour d'un conducteur

Country Status (6)

Country Link
US (1) US20060288568A1 (ko)
EP (1) EP1630829B1 (ko)
KR (1) KR20060050654A (ko)
AT (1) ATE366457T1 (ko)
DE (1) DE602005001534T2 (ko)
FR (1) FR2874736B1 (ko)

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FR2874736A1 (fr) 2006-03-03
US20060288568A1 (en) 2006-12-28
KR20060050654A (ko) 2006-05-19
DE602005001534D1 (de) 2007-08-16
FR2874736B1 (fr) 2006-11-03
EP1630829A1 (fr) 2006-03-01
DE602005001534T2 (de) 2008-03-20
ATE366457T1 (de) 2007-07-15

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