CN201503723U

CN201503723U - Fireproof power cable

Info

Publication number: CN201503723U
Application number: CN2009203116998U
Authority: CN
Inventors: 丁振生; 陈沛云; 张海涛
Original assignee: QINGDAO HANHE CABLE CO Ltd
Current assignee: QINGDAO HANHE CABLE CO Ltd
Priority date: 2009-09-28
Filing date: 2009-09-28
Publication date: 2010-06-09
Anticipated expiration: 2019-09-28

Abstract

The utility model relates to a power cable, particularly to a fireproof cable for a supply circuit suitable for important inflammable and explosive places. The fireproof power cable comprises a conductive core; an outer sheath layer is wrapped at the periphery of the conductive core; and an insulation layer and a wrapping layer are wrapped between the conductive core and the outer sheath layer from the inside out sequentially. The cable provided by the utility model integrates the advantages of a mineral insulation fireproof cable and a mica insulation fireproof cable into a whole, thereby being a flexible fireproof cable with a required metal inorganic insulation sheath which has high fireproof property and high insulativity.

Description

The fire prevention power cable

Technical field

The utility model relates to a kind of power cable, relates in particular to a kind of fire-resisting cable that is applicable to supply line's use in inflammable and explosive important place.

Background technology

Present market at different levels uses the fire-resisting cable kind numerous and diverse, and quality is uneven, and its defective is respectively arranged, for the safety fire-fighting has brought certain hidden danger.For example: mineral insulated cable, though have higher serviceability temperature, voltage withstand class is low, make complexity and waste energy, be abroad to move to transfer made in China a kind of cable.The manufacturing equipment that it has been rarely had is at present abroad changed hands China and oneself is no longer produced, and idol has use also from Chinese import.Have this drum length of cable short again, bending property is poor, the construction requirement height, and use is restricted.

The wrapped fire-resisting cable of traditional mica is owing to contain organic material in its structure, and after meeting fire burns, organic material burns and loses, and make cable can not continue for a long time to use, so the application of such cable is subjected to certain restriction.

In view of the foregoing, cable industry has carried out various improvement to fire-resisting cable, attempt to make it to have the advantage of mineral insulation and mica insulation simultaneously, use not enough to eliminate it, form core by conductor and wrapped mica, filling mineral powder (magnesium oxide) between core and copper sheath, owing to adopt traditional mineral insulation manufacturing process, the defective of mineral insulated cable still exists.

Existing fire-resisting cable also has has increased the inorganic fire-resistant expanding layer of one deck between core and copper sheath.Though inorganic fire-resistant expanding layer has improved the fire-resistance property of cable to a certain extent, the integral insulation level of cable is not improved, and makes it satisfy external applied voltage grade.

The utility model content

Technique effect of the present utility model can overcome above-mentioned defective, and a kind of fire prevention power cable is provided, and it is simple in structure, and fire resistance is good.

For achieving the above object, the utility model adopts following technical scheme: it comprises conductive cores, the peripheral parcel of conductive cores external sheath layer, wrap insulate layer, lapping layer successively from inside to outside between conductive cores and the external sheath layer.

The utility model provides a kind of fire-resisting cable that integrates mineral insulation and mica insulation cable, owing to adopt insulating protective layer to make insulation more closely knit, adopts phase-splitting and turnkey composite insulation structure simultaneously, and the cable body insulation property are improved greatly.

Coated metal restrictive coating between lapping layer and the external sheath layer.

Conductive cores is that single core copper conductor or conductive cores are made up of two or more multicore copper conductors, and conductor is formed circle or many copper single lines is twisted in advance fan-shaped by the stranded back of pressing of many copper single lines, and promptly conductive cores is circular, fan-shaped or watt shape structure.

Cable unit is formed by insulating barrier, lapping layer parcel from inside to outside successively in each conductive cores outside, is provided with inorganic packed layer between the cable unit.

Cable of the present utility model is mainly reflected in following two aspects:

In flame temperature is under 950 ℃ of conditions, makes simultaneously that cable stands that water drenches, vibration and impacting, and applies the 0.6/1kV alternating voltage and last the 3h cable and do not puncture;

Cable is through 2.4kV, 4h and 3.5kV, and 5min AC power frequency withstand voltage test cable does not puncture.

The advantage that cable of the present utility model has mineral insulation and a mica insulation fire-resisting cable is in one, can satisfy high fire-resistant, metal inorganic insulating sleeve flexible fire-proof cable that high-insulativity is required.

Description of drawings

Below in conjunction with the drawings and specific embodiments the utility model is elaborated:

Fig. 1 is the cross-sectional structure schematic diagram of the utility model single-core cable embodiment 1;

Fig. 2 is the cross-sectional structure schematic diagram of the utility model multicore cable embodiment 2.

Embodiment

Cable comprises conductive cores 1, the peripheral parcel of conductive cores 1 external sheath layer 6, wrap insulate layer 2, lapping layer 3 successively from inside to outside between conductive cores 1 and the external sheath layer 6.

Embodiment 1

The specified maximum working voltage of the conveying of cable is 0.6/1kV, the conductive cores 1 of cable is made up of single core copper conductor, conductor forms circle by the many stranded backs of pressing of copper single line, at the thick thick alkali-free glass wool cloth lapping layer 3 of composite insulation layer 2, two-layer 0.17mm of its wrapped successively multilayer 0.14mm in outside; The vertical annular corrugated metallic sheath layer 5 that wraps copper strips embossing after moulding, welding of the thick electrician's copper one-tenth of one deck 0.3mm～0.5mm in lapping layer 3 outsides extrudes the anticorrosion external sheath layer 6 of the thick low smoke halogen-free flame-retardant polyolefin of one deck 1.4mm～2.2mm at last in metal sheath layer 5 outsides again.

Embodiment 2

The specified maximum working voltage of the conveying of cable is 0.6/1kV, the conductive cores 1 of cable is made up of the multicore copper conductor, conductor by many copper single lines stranded press the back forms circular or many copper single lines are twisted in advance fan-shaped, the lapping layer 3 composition cable unit of the alkali-free glass wool cloth material that insulating barrier 2, the two-layer 0.17mm of the synthetic mica material that wrapped successively multilayer 0.14mm is thick outside it is thick; Be to adopt asbestos cord to fill in the multicore cable stranding process to form inorganic packed layer 4 between the cable unit; Behind the stranding, the synthetic mica insulating barrier 2 that wrapped successively multilayer 0.14mm is thick, the alkali-free glass wool cloth insulation lapping layer 3 that two-layer 0.17mm is thick; The vertical annular corrugated metallic sheath layer 5 that wraps copper strips embossing after moulding, welding of the thick electrician's copper one-tenth of one deck 0.3mm～0.5mm in lapping layer 3 outsides extrudes the anticorrosion external sheath layer 6 of the thick low smoke halogen-free flame-retardant polyolefin of one deck 1.4mm～2.3mm at last in metal sheath layer 5 outsides again.

Claims

1. a fire prevention power cable comprises conductive cores, and the peripheral parcel of conductive cores external sheath layer is characterized in that between conductive cores and the external sheath layer from inside to outside wrap insulate layer, lapping layer successively.

2. fire prevention power cable according to claim 1 is characterized in that coated metal restrictive coating between lapping layer and the external sheath layer.

3. fire prevention power cable according to claim 1 and 2 is characterized in that conductive cores is single core copper conductor.

4. fire prevention power cable according to claim 1 and 2 is characterized in that conductive cores is made up of two or more multicore copper conductors.

5. fire prevention power cable according to claim 4 is characterized in that conductive cores is circular, fan-shaped or watt shape structure.

6. fire prevention power cable according to claim 4 is characterized in that forming cable unit by insulating barrier, lapping layer parcel successively from inside to outside outside each conductive cores.

7. fire prevention power cable according to claim 6 is characterized in that being provided with between the cable unit inorganic packed layer.