CN2210453Y

CN2210453Y - Fire-resistant cable

Info

Publication number: CN2210453Y
Application number: CN 94230634
Authority: CN
Inventors: 张明华
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-11-10
Filing date: 1994-11-10
Publication date: 1995-10-18
Anticipated expiration: 2004-11-10

Abstract

A fire-resistant cable solves problems of the existing fire-resistant cables that the fireproof performance can hardly achieve the ideal value, and can not efficiently raise fire-resistant performance with poor insulating properties. The utility model comprises a conductor with the exterior which is a compound flame-proof insulating layer composed of a mica tape and a polytetrafluoroethylene film; the exterior of the compound flame-proof insulating layer is a glass fiber woven protective layer on which a high temperature lacquer layer is arranged. More than two conducting wire cores are formed into cables and glass cloth belts are wrapped on the outer margin of the cables. A chief sheath glass fiber woven protective layer is arranged on the glass cloth belts. The outmost layer is the high temperature lacquer layer. The utility model has the advantages that the utility model does not combust burn or support burn when the utility model meets open flame, which guarantees the conductivity and the safety of the fire-resistant cable at 800 DEG C.

Description

Fire-resistant cable

The utility model relates to a kind of incombustible electrical cable.

Incombustible electrical cable of the prior art; as application number is 89106117; authorization number is the disclosed incombustible electrical cable of CN1016473B; comprise the cable of forming by cable core, filler, skin and the external protection of tape insulation layer; it is characterized in that insulating barrier, filler and crust made by a kind of not composite fuel; this composition is made up of polytetrafluoroethylene, antimony oxide, zinc oxide, Firebrake ZB and age resistor; according to the specification of this patent of invention, pulverulent above-mentioned each component is evenly mixed the back at normal temperatures make by extruder.In the incombustible electrical cable that the foregoing invention patent provides, be used for generally painting " zinc white " and " stibium trioxide " and Firebrake ZB and age resistor and improve fire resistance by in polytetrafluoroethylene, adding, its fire protecting performance is difficult to reach ideal value, can not improve the performance that it does not burn, does not prolong burning effectively, its structure is more complicated also, and cost is also high.In addition, the coating of its woven protective layer is general organosilicon coating, and contain aluminium oxide in the general organosilicon coating with insulation property, add that its structure needs sinter molding, the burning junction temperature is controlled when bad, and embrittlement easily takes place, and its insulating barrier fire resistance can obviously descend, or else its organosilicon coating has insulation property, and its security performance is just very poor.

The purpose of this utility model is to overcome weak point of the prior art, and existing incombustible electrical cable is carried out structural improvement, and is a kind of simple in structure and cost is low does not burn, do not prolong that combustion, height are fire-resistant, the incombustible electrical cable of safety and reliability to obtain.

The utility model is to realize like this.

It includes conductor, and conductor is outward the composite fire insulating barrier, and the composite fire insulating barrier is outward the glass braid sheath, is the high temperature enamelled coating thereon; Said composite fire insulating barrier is made up of mica tape and polytetrafluoroethylene film; Behind above-mentioned conductor wire core stranding more than two, outer rim is wound with the glass fiber strap behind stranding, is total sheath glass braid sheath on it, and outermost layer is the high temperature enamelled coating.

Compare with existing incombustible electrical cable, the utility model has adopted the composite fire insulating barrier of being made up of mica tape and polytetrafluoroethylene film, the high-temperature insulation performance of polytetrafluoroethylene and the hot-face insulation performance of mica tape have been utilized simultaneously, and the change Qu Xingneng of these two kinds of materials is also fine, so what twine is very closely knit, there is not the possibility that embrittlement takes place, particularly mica tape can not damage under 1500 ℃, more improved the fire protecting performance of incombustible electrical cable, do not burn, do not prolong combustion thereby meet naked light, guarantee conductivity and the fail safe of incombustible electrical cable in the time of 800 ℃.

The high temperature lacquer that the utility model adopts is to be disclosed not burning coating material in 93105547.4 as application number, because this does not contain aluminium oxide in the burning coating material, and contain burning-point high and active good rare-earth oxidation zinc and lanthana therein, therefore, on heat-resisting quantity that improves this cable and high fire resistance basis, also guaranteed the insulating properties of this cable, thereby safety and reliability.

The utility model is by single core mica tape, polytetrafluoroethylene film and outer high temperature enamelled coating thereof and outermost high temperature enamelled coating have been formed four road high-temperature insulation fireprotection layers, therefore more improved the fire protecting performance of incombustible electrical cable, and with the needs in this satisfied modernization industry safety in production.

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the incombustible electrical cable structural representation with water resistance;

Fig. 3 is the structural representation with incombustible electrical cable of shielding properties;

Provide embodiment of the present utility model below in conjunction with accompanying drawing

Embodiment 1

As shown in Figure 1, it has a copper conductor 1, the copper conductor 1 outer mica tape 2 that is wound with is wound with polytetrafluoroethylene film 3 outside the mica tape 2, and forms the composite fire insulating barrier by mica tape 2 and polytetrafluoroethylene film 3, this composite fire insulating barrier is outward a glass braid sheath 4, be impregnated with high temperature enamelled coating 5 thereon, behind above-mentioned conduction cable core stranding more than two, be wound with glass fiber strap 6 in the stranding outer rim, be that total sheath glass wool cloth is compiled sheath 7 on it, outermost layer is the high temperature enamelled coating 8 of dipping.

Embodiment 2

As shown in Figure 2

It has a copper conductor 1, outside copper conductor 1, be wound with polytetrafluoroethylene film 3, the polytetrafluoroethylene film 3 outer mica tapes 2 that are wound with, and form the composite fire insulating barrier by mica tape 2 and polytetrafluoroethylene film 3, this composite insulation layer is outward the watertight composition of extruding with fire-resistant cable material 9, outside the watertight composition 9 is glass braid sheath 4, be impregnated with high temperature enamelled coating 5 thereon, behind above-mentioned conductor wire core stranding more than two, be wound with glass fiber strap 6 in the stranding outer rim, be total sheath glass braid sheath 7 on it, outermost layer is the high temperature enamelled coating 8 of dipping.

Embodiment 3

As shown in Figure 3

It has a copper conductor 1, be wound with mica tape 2 at copper conductor 1 external diameter, the mica 2 outer polytetrafluoroethylene films 3 that are wound with, and form the composite fire insulating barrier by mica tape 2 and polytetrafluoroethylene film 3, this composite insulation layer is outward a glass braid sheath 4, be impregnated with high temperature enamelled coating 5 thereon, behind above-mentioned conductor wire core stranding more than two, be wound with polyester film 10 in the stranding outer rim, the polyester film 10 outer metal screen layers 11 that are woven with, being tied with glass fiber strap 6 on it, is total sheath glass fiber layer of cloth 7 on it, and outermost layer is the high temperature enamelled coating 8 of dipping.

The high temperature enamelled coating of being mentioned 5 and 8 in the foregoing description 1～3, employing be to be disclosed not burning coating material in 93105547.4 applications for a patent for invention as application number, promptly in the organosilicon coating of oxygen-free aluminium, add rare earth lanthanum oxide and zinc oxide.Also can directly select the flame-proof organosilicon lacquer for use.

Claims

1, a kind of incombustible electrical cable; comprise conductor (1); composite fire insulating barrier (2) and (3); glass braiding protective layer (4) and (7); high temperature enamelled coating (5) and (8); it is characterized in that said composite fire insulating barrier (2) is that mica tape, (3) are polytetrafluoroethylene film, is wound with glass fiber strap (6) in the stranding outer rim.

According to the said incombustible electrical cable of claim 1, it is characterized in that 2, said composite fire insulating barrier (3) is a polytetrafluoroethylene film, (2) are mica tape, and go up the watertight composition (9) that useful fire-resistant cable material is extruded at this mica tape (2).

3, according to the said incombustible electrical cable of claim 1, it is characterized in that, between high temperature enamelled coating (5) and glass fiber strap (6), also be wound with one deck polyester film (10) and be woven with metal screen layer (11).