EP1110225B1 - Gaine de protection thermique pour un faisceau de cables electriques - Google Patents
Gaine de protection thermique pour un faisceau de cables electriques Download PDFInfo
- Publication number
- EP1110225B1 EP1110225B1 EP00949663A EP00949663A EP1110225B1 EP 1110225 B1 EP1110225 B1 EP 1110225B1 EP 00949663 A EP00949663 A EP 00949663A EP 00949663 A EP00949663 A EP 00949663A EP 1110225 B1 EP1110225 B1 EP 1110225B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- thermal protection
- protection sheath
- sheath
- sheath according
- fibres
- 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 - Lifetime
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Classifications
-
- 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
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
Definitions
- the present invention relates to a thermal protection sheath for an electric cable bundle, of the type comprising organic fibers oxidized carbonizable.
- electrical wires can continue to perform their function of electrical conduction for a specified period. More specifically, it is requested for the electric harnesses of an aircraft that the insulation resistance between two wires of the same beam remains greater than 10 k ⁇ for five minutes and / or that the temperature of the wires remains below 250 ° C. for three and a half minutes, when the beam is brought into contact with a flame of 1100 ° C with a power of 116 kW / m 2 .
- Document FR-A-2 708 781 describes a fire-resistant sheath and its process development.
- the fireproof sheath described is formed essentially of a interlacing of synthetic fibers obtained by cracking and spinning a aramid fiber and a carbonizable oxidized organic fiber.
- the fibers of aramid and oxidized carbonizable organic fibers are mixed in the same layer forming a screen.
- thermal protection sheath provides protection satisfactory conductors up to a temperature of about 850 ° C, this is insufficient for flame temperatures of the order of 1100 ° C.
- the object of the invention is to provide a thermal protection sheath resistant to flame temperatures of the order of 1100 ° C, and guaranteeing satisfactory operation of the electrical wires protected by the sheath for a substantial period.
- the subject of the invention is a thermal protection sheath for a bundle of electric cables, of the aforementioned type, characterized in that it comprises an internal screen formed of at least one layer comprising mostly carbonized oxidized organic fibers and a screen shell having at least one layer formed of ceramic fibers arranged around the internal screen.
- the wiring element shown in FIGS. 1 and 2 comprises a beam of cables 10 surrounded by a thermal protection sheath 12 according to the invention.
- the cable bundle 10 consists of a set of cables or electrical wires insulated individually by a protective sheath. These threads electrical devices are for example intended for the transport of control information for the navigation organs of a space launcher or an airplane.
- the thermal protection sheath 12 essentially comprises a internal screen 14 formed of several layers predominantly comprising oxidized organic carbonizable fibers, and an external screen 16 comprising a layer formed of ceramic fibers, in particular based on aluminoborosilicate.
- the external screen 16 is arranged directly around the internal screen 14 without interposition of an intermediate material.
- the protective sheath 12 has under the internal screen 14 a layer 18 of complementary thermal protection mainly comprising KEVLAR marketed by Du Pont de Nemours.
- the sheath 12 presents around the outer screen 16 a layer mechanical protection device 20 made, for example, based on aramid fibers braided.
- the internal screen 14 advantageously consists of at least two layers consisting essentially of carbonizable oxidizable organic fibers. Preferably, from three to seven layers are superimposed for one total thickness of the internal screen 14 between 2 and 6 mm.
- the internal screen 14 is composed of three identical superimposed layers denoted 14A, 14B, 14C.
- Each layer is advantageously braided and the successive layers are performed by overbraiding.
- the braiding is adapted so that a large amount of air is contained in the internal screen 14.
- the internal screen 14 consists of more than 85% in weight of carbonized oxidized organic fibers. These fibers are by example based on oxidized polyacrylonitrile (PANO).
- PANO oxidized polyacrylonitrile
- the majority fibers forming the internal screen 14 are, for example, PANOX sold by RK Carbon Fibers or SIGRAFIL marketed by SIGRI.
- the internal screen 14 comprises, in addition to fibers oxidized organic carbonizable, other fibers such as fibers marketed under the name CHLOROFIBRE manufactured by the company RHOVIL.
- the fibers used in the composition of the internal screen 14 have a resistance at a temperature of about 800 ° C.
- the outer screen 16 consists of a braid of continuous filaments.
- These continuous filaments are ceramic filaments, for example made silica-based.
- These filaments are advantageously alumino-boro-silicates (ABS), such as NEXTEL wires, marketed by the company 3M.
- ABS alumino-boro-silicates
- These filaments are adapted to withstand a very high temperature, and in particular at a temperature of about 1200 ° C.
- These filaments mainly entering the composition of the screen internal 14 may also be formed of Nextel son.
- the inner protective layer 18 is arranged around the bundle This layer 18 consists of a braid or a taping of KEVLAR or a mixture of KEVLAR and Chlorofibre.
- the complementary thermal protection layer 18 is optional. When this is implemented, the thickness of the internal screen 14 is reduced. Indeed, KEVLAR has better thermal insulation properties than oxidized polyacrylonitrile at temperatures around 450 ° C.
- the implementation of the complementary thermal protection layer 18 based KEVLAR allows to decrease the thickness of the screen internal 14 and thus reduce the total thickness of the sheath.
- the external mechanical protection layer 20 is advantageously made from braided aramid fibers, and in particular NOMEX marketed by the company Du Pont de Nemours.
- the mechanical protection layer 20, arranged around the screen internal 16 is optional. This mechanical protection layer allows to avoid the release of fibrous residues from the outer screen 16. Indeed, alumino-boro-silicate fibers, and especially NEXTEL, tend to fluffing due to the braiding process and releasing incompatible unwanted particles for example with the use of the protective sheath in a clean room.
- the mechanical protection layer also protects the manipulator of the cabling with respect to soft toys ceramic fibers that may be in contact with the skin or eyes.
- the sheath is advantageously surrounded by a sealing material and in particular a heat-shrinkable sheath or self-amalgamating tape, such as sheaths heat-shrinkable sold by RAYCHEM under the name THERMOFIT sleeves and self-amalgamating silicone tapes marketed by the company NITTO.
- a sealing material such as sheaths heat-shrinkable sold by RAYCHEM under the name THERMOFIT sleeves and self-amalgamating silicone tapes marketed by the company NITTO.
- sheaths of different thicknesses were used. These sheaths, denoted A and B have the features summarized in the following table.
- the sheath A has a thickness less than that of the sheath B.
- the 6.7 mm diameter cable bundle has six pairs shielded sheathed.
- the temperature of the electrical wires is, in the case of sheath B, less than 250 ° C, and in particular less than 200 ° C. Of more, even if for a small thickness of the sheath corresponding to the curve At the temperature after 3 min 30 sec greater than 250 ° C, this one remains below 250 ° for 2 min 30 sec.
- sheaths A and B have resistors isolation between two adjacent wires much larger than 10 k ⁇ for a flame exposure time of 5 min.
Landscapes
- Insulated Conductors (AREA)
Description
- ledit écran interne comporte au moins 85 % en poids de fibres organiques oxydées carbonisables ;
- lesdites fibres organiques oxydées carbonisables dudit écran interne sont à base de polyacrylonitrile oxydé ;
- ledit écran interne comporte des chlorofibres ;
- ledit écran interne comporte au moins deux couches superposées de fibres organiques oxydées carbonisables ;
- ledit écran interne comporte une superposition de couches tressées d'une épaisseur totale comprise entre 2 et 6 mm ;
- les fibres céramiques sont constituées d'alumino-boro-silicate ;
- elle comporte sous ledit écran interne, une couche de protection thermique complémentaire comportant majoritairement du KEVLAR ; et
- elle comporte autour dudit écran externe une couche de protection mécanique comportant majoritairement de l'aramide.
- la figure 1 est une vue schématique d'un faisceau de câbles protégé par une gaine selon l'invention ;
- la figure 2 est une vue en section transversale du faisceau de la figure 1 prise suivant la ligne II-II ;
- les figures 3 et 4 sont des courbes montrant, pour deux gaines de protection thermique selon l'invention ayant des épaisseurs différentes, respectivement, l'évolution de la température des fils conducteurs et de leur résistance d'isolement.
- la divergence du flux thermique en formant un déflecteur;
- une barrière isolante haute température ;
- le maintien mécanique des résidus de combustion des produits internes.
- une barrière isolante à température élevée par sa faible conductivité thermique due également à la présence d'air ;
- une barrière isolante par ses propriétés de filtration infrarouge ;
- une barrière isolante par ses propriétés endothermiques par transformation physique ou chimique.
Claims (8)
- Gaine de protection thermique (12) pour un faisceau de câbles électriques, du type comportant des fibres organiques oxydées carbonisables, caractérisée en ce qu'elle comporte un écran interne (14) formé d'au moins une couche comportant majoritairement des fibres organiques oxydées carbonisables et un écran externe (16) comportant au moins une couche formée de fibres de céramique disposées autour de l'écran interne (14).
- Gaine de protection thermique selon la revendication 1, caractérisée en ce que ledit écran interne (14) comporte au moins 85 % en poids de fibres organiques oxydées carbonisables.
- Gaine de protection thermique selon la revendication 1 ou 2, caractérisée en ce que lesdites fibres organiques oxydées carbonisables dudit écran interne (14) sont à base de polyacrylonitrile oxydé.
- Gaine de protection thermique selon l'une quelconque des revendications précédentes, caractérisée en ce que ledit écran interne (14) comporte des chlorofibres.
- Gaine de protection thermique selon l'une quelconque des revendications précédentes, caractérisée en ce que ledit écran interne (14) comporte au moins deux couches superposées de fibres organiques oxydées carbonisables.
- Gaine de protection thermique selon la revendication 5, caractérisée en ce que ledit écran interne (14) comporte une superposition de couches tressées d'une épaisseur totale comprise entre 2 et 6 mm.
- Gaine de protection thermique selon l'une quelconque des revendications précédentes, caractérisée en ce que les fibres céramiques sont constituées d'alumino-boro-silicate.
- Gaine de protection thermique selon l'une quelconque des revendications précédentes, caractérisée en ce qu'elle comporte autour dudit écran externe (16) une couche de protection mécanique (20) comportant majoritairement de l'aramide.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9908797A FR2796198B1 (fr) | 1999-07-07 | 1999-07-07 | Gaine de protection thermique pour un faisceau de cables electriques |
FR9908797 | 1999-07-07 | ||
PCT/FR2000/001955 WO2001004912A1 (fr) | 1999-07-07 | 2000-07-06 | Gaine de protection thermique pour un faisceau de cables electriques |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1110225A1 EP1110225A1 (fr) | 2001-06-27 |
EP1110225B1 true EP1110225B1 (fr) | 2005-01-26 |
Family
ID=9547824
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00949663A Expired - Lifetime EP1110225B1 (fr) | 1999-07-07 | 2000-07-06 | Gaine de protection thermique pour un faisceau de cables electriques |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1110225B1 (fr) |
DE (1) | DE60017699T2 (fr) |
FR (1) | FR2796198B1 (fr) |
WO (1) | WO2001004912A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018202760A1 (fr) * | 2017-05-03 | 2018-11-08 | Favuseal As | Procédé de protection d'un objet contre le feu et revêtement de protection contre le feu pour un objet |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2708781B1 (fr) * | 1993-07-30 | 1996-01-19 | Europ Propulsion | Gaine anti-feu et procédé d'élaboration de cette gaine. |
-
1999
- 1999-07-07 FR FR9908797A patent/FR2796198B1/fr not_active Expired - Lifetime
-
2000
- 2000-07-06 DE DE60017699T patent/DE60017699T2/de not_active Expired - Lifetime
- 2000-07-06 EP EP00949663A patent/EP1110225B1/fr not_active Expired - Lifetime
- 2000-07-06 WO PCT/FR2000/001955 patent/WO2001004912A1/fr active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
DE60017699T2 (de) | 2005-09-01 |
EP1110225A1 (fr) | 2001-06-27 |
FR2796198B1 (fr) | 2001-10-19 |
WO2001004912A1 (fr) | 2001-01-18 |
FR2796198A1 (fr) | 2001-01-12 |
DE60017699D1 (de) | 2005-03-03 |
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