CN211578441U

CN211578441U - Flame-retardant power cable with crosslinked polyethylene insulating steel strip armored low-smoke polyvinyl chloride sheath

Info

Publication number: CN211578441U
Application number: CN201922479342.7U
Authority: CN
Inventors: 刘磊
Original assignee: Wuxi Great Wall Electric Wire & Cable Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-09-25
Anticipated expiration: 2029-12-31

Abstract

The utility model discloses a fire-retardant power cable of low smoke polyvinyl chloride sheath of crosslinked polyethylene insulated steel band armor, the cable core comprises a cable core, the cable core form by many insulation core transposition, fill fire-retardant expansion area in the space department of cable core, around the fire-retardant layer of package second outside the cable core, around package glass fiber tape outside the fire-retardant layer of second, at glass fiber outband cladding steel band armor, at the fire-retardant layer of steel band armor outer coating hydrated zinc borate, at hydrated zinc borate fire-retardant layer outer around package brominated polystyrene inner sheath, at the outer cladding tensile layer of brominated polystyrene inner sheath, overlap outside the tensile layer and extrude package low smoke polyvinyl chloride oversheath behind the package vermiculite flame retardant cloth. The utility model discloses have difficult disconnected core, bearing capacity is strong, the mechanicalness is good, effect such as fire-resistant fire resistance is good.

Description

Flame-retardant power cable with crosslinked polyethylene insulating steel strip armored low-smoke polyvinyl chloride sheath

Technical Field

The utility model belongs to the technical field of power cable and specifically relates to indicate a fire-retardant power cable of low cigarette polyvinyl chloride sheath of insulating steel band armor of crosslinked polyethylene.

Background

At present, with the development of society, the demand of cables is continuously rising, people have higher and higher requirements on the cables, particularly in the environment of flame-retardant and fire-resistant cables, when the cables are under the action of external stress, internal leads are easy to displace, the local temperature of the cables is too high, and the communication effect of the cables is influenced; the existing cable is poor in fire-resistant and flame-retardant effect, and in the working process of the cable, the cable can burn when exposed fire occurs or the temperature of the cable is too high and natural, so that the current-carrying capacity of the cable is reduced.

Important public places such as large-scale meeting places, office buildings, hotels, hospitals, subway stations and the like have certain power supply requirements under the condition of fire, the cable can be normally powered, various control signals and alarm signals are not powered off within a certain time, and valuable time is provided for escape, automatic alarm, starting of fire-fighting facilities, rescue and use of emergency equipment. At present, the fire-retardant fire-resistant tape of wrapping of current low smoke and zero halogen that is used for the cable to use, flame retardant efficiency is poor, and the wearability is not high, and life is short, and tensile strength is low, uses inconveniently, is unfavorable for using widely to the bearing capacity of cable is not considered in the pursuit fire-retardant, the fire prevention effect of current cable taste, and a lot of cables are laying, warp very easily, flatten, lead to the fracture of sinle silk.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a low smoke polyvinyl chloride sheath flame retardant power cable of insulating steel band armor of crosslinked polyethylene who has difficult disconnected core, bearing capacity is strong, the mechanicalness is good, fire-resistant fire resistance is good is provided.

A fire-retardant power cable of low smoke polyvinyl chloride sheath of insulating steel band armor of crosslinked polyethylene, the cable core comprises a cable core, the cable core form by many insulation core transposition, fill fire-retardant expansion area in the space department of cable core, around the fire-retardant layer of package second outside the cable core, around package glass fiber band outside the fire-retardant layer of second, at glass fiber outband cladding steel band armoring layer, at the fire-retardant layer of steel band armoring layer outer coating hydrated zinc borate, at hydrated zinc borate fire-retardant layer outer around the interior sheath of package brominated polystyrene, at the exterior cladding tensile layer of interior sheath of brominated polystyrene, overlap outside the tensile layer and extrude package low smoke polyvinyl chloride oversheath behind the package vermiculite fire-retardant cloth.

The further improvement is that the insulated wire core is composed of a copper conductor, a cross-linked polyethylene insulating layer extruded outside the copper conductor, a first flame-retardant layer wrapped outside the cross-linked polyethylene insulating layer, and a semi-conductive shielding layer extruded outside the first flame-retardant layer.

In a further improvement, the second flame-retardant layer is formed by warp and weft weaving of glass fibers and basalt fibers.

In a further improvement, the tensile core is fixedly arranged in the tensile layer.

Further improved, the tensile core is a steel core, a carbon fiber rope or a silicon rubber rope.

The beneficial effects of the utility model reside in that:

firstly, a flame-retardant layer formed by warp and weft weaving of polyester flame-retardant yarns and Kevlar fiber yarns is arranged in an insulating wire core, so that the tensile strength of the wire core is improved, and the flame-retardant and fireproof performance of the wire core is also improved; the filling flame-retardant expansion belt adopts expanded graphite, the flame retardance belongs to a solidification phase flame-retardant mechanism, the flame retardance is achieved by delaying or interrupting the generation of combustible substances by solid substances, the expanded graphite starts to expand when heated to a certain degree, so that a thick porous carbide layer is formed, the carbide layer has enough thermal stability to separate a flame-retardant main body from a heat source, so that the decomposition of a polymer is delayed and terminated, and the carbide layer is non-toxic, does not generate toxic or corrosive gas when heated, and can greatly reduce the smoke generation amount; the second flame-retardant layer is formed by warp and weft weaving of glass fibers and basalt fibers, so that the tensile strength, the flame-retardant and fireproof performance of the wire core are improved, and the good alkali resistance of the basalt fibers is fully exerted; the flame retardant layer of hydrated zinc borate is coated, so that the flame retardant property can be effectively improved, the generation of smoke during combustion is reduced, and the flame retardant property of the cable is improved; the brominated polystyrene inner sheath is coated, so that the high flame retardance, the thermal stability, the light stability and other good mechanical physical and chemical properties of the cable are improved; the tensile layer can enable the cable body to have better tensile property and not to easily crack, and in addition, the tensile cores are multiple, and the tensile effect of the tensile layer can be improved by the aid of the multiple tensile cores; the cable is wrapped with the vermiculite flame-retardant cloth, so that the cable is high-temperature resistant, low in heat conductivity coefficient, thermal shock resistant, low in heat capacity, excellent in high-temperature insulating property, resistant to corrosion of nonferrous metals such as molten aluminum and zinc, good in bottom temperature and high-temperature strength and long in service life; high temperature resistance and good heat insulation effect; the halogen-free low-smoke flame-retardant polyolefin sheath material with the oxygen index, smoke density, crusting property and other parameters reaching the standard is adopted, the extruded surface is required to be smooth and round, the sheath material is tightly extruded on a cable core, the section of the sheath material has no visible pores with normal vision, and no obvious combustion drips exist in the flame combustion process.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

As shown in fig. 1, the flame retardant power cable with the cross-linked polyethylene insulated steel strip armored low-smoke polyvinyl chloride sheath comprises a cable core, wherein the cable core is formed by twisting a plurality of insulated wire cores, each insulated wire core is composed of a copper conductor 1, a cross-linked polyethylene insulating layer 2 extruded outside the copper conductor, a first flame retardant layer 3 wrapped outside the cross-linked polyethylene insulating layer, and a semi-conductive shielding layer 4 extruded outside the first flame retardant layer; the first flame-retardant layer is formed by warp and weft weaving of polyester flame-retardant yarns and Kevlar fibers, so that the tensile strength of the wire core is improved, and the flame-retardant and fireproof performance of the wire core is also improved;

the cable core is filled with a flame-retardant expansion band 5, expanded graphite is adopted, the flame retardance belongs to a solidification phase flame-retardant mechanism, the flame retardance is achieved by delaying or interrupting the generation of combustible substances by solid substances, the expanded graphite starts to expand after being heated to a certain degree, so that a thick porous carbide layer is formed, the carbide layer has enough thermal stability to separate a flame-retardant main body from a heat source, so that the decomposition of a polymer is delayed and terminated, and the cable core is non-toxic, does not generate toxic and corrosive gases when being heated, and can greatly reduce the smoke generation amount; the second flame-retardant layer 6 is wrapped outside the cable core and is formed by warp and weft weaving of glass fibers and basalt fibers, so that the tensile strength, the flame-retardant and fireproof performance of the cable core are improved, and the good alkali resistance of the basalt fibers is fully exerted; the glass fiber belt 7 is wrapped outside the second flame-retardant layer, the steel belt armor layer 8 is wrapped outside the glass fiber belt, and the hydrated zinc borate flame-retardant layer 9 is coated outside the steel belt armor layer, so that the flame-retardant property can be effectively improved, the generation of smoke during combustion is reduced, and the flame retardance of the cable is improved; the brominated polystyrene inner protective layer 10 is coated outside the hydrated zinc borate flame retardant layer, so that the high flame retardance, the thermal stability, the light stability and other good mechanical physical and chemical properties of the cable are improved, the brominated polystyrene inner protective layer is coated with the tensile layer 11, the tensile core 14 is fixedly installed inside the tensile layer, and the tensile core is a steel core, a carbon fiber rope or a silicon rubber rope, so that the cable body has better tensile property and cannot be easily cracked; the cable is high-temperature resistant, low in heat conductivity coefficient, thermal shock resistant, low in heat capacity, excellent in high-temperature insulation performance, resistant to corrosion of nonferrous metals such as molten aluminum and zinc, good in base temperature and high-temperature strength and long in service life by overlapping the vermiculite flame-retardant cloth 12 outside the tensile layer; high temperature resistance and good heat insulation effect; the outermost layer is extruded with a low-smoke polyvinyl chloride outer sheath 13, the extruded surface is required to be smooth and round, the outer sheath is tightly extruded on the cable core, the section of the cable core is free of visible air holes with normal vision, and no obvious combustion drips exist in the flame combustion process.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention. The components not specified in this embodiment can be implemented by the prior art.

Claims

1. The utility model provides a fire-retardant power cable of insulating steel band armor low smoke polyvinyl chloride sheath of crosslinked polyethylene which characterized in that: the cable core, the cable core form by many insulation core transposition, fill fire-retardant expansion band in the gap department of cable core, wrap the fire-retardant layer of second outside the cable core, wrap the glass fiber area outside the fire-retardant layer of second, at glass fiber outband cladding steel band armor, at the fire-retardant layer of steel band armor external coating hydrated zinc borate, wrap the interior sheath of brominated polystyrene outside the fire-retardant layer of hydrated zinc borate, at the outer cladding tensile layer of interior sheath of brominated polystyrene, overlap outside the tensile layer and crowd the low smoke polyvinyl chloride oversheath of package behind the vermiculite flame retardant cloth.

2. The flame-retardant power cable with the crosslinked polyethylene insulated steel strip armored low-smoke polyvinyl chloride sheath as claimed in claim 1, is characterized in that: the insulating wire core consists of a copper conductor, a cross-linked polyethylene insulating layer extruded outside the copper conductor, a first flame-retardant layer wrapped outside the cross-linked polyethylene insulating layer, and a semi-conductive shielding layer extruded outside the first flame-retardant layer.

3. The flame-retardant power cable with the crosslinked polyethylene insulated steel strip armored low-smoke polyvinyl chloride sheath as claimed in claim 1, is characterized in that: the second flame-retardant layer is formed by weaving glass fibers and basalt fibers in a warp-weft mode.

4. The flame-retardant power cable with the crosslinked polyethylene insulated steel strip armored low-smoke polyvinyl chloride sheath as claimed in claim 2, is characterized in that: the first flame-retardant layer is formed by warp and weft weaving of polyester flame-retardant yarns and Kevlar fiber yarns.

5. The flame-retardant power cable with the crosslinked polyethylene insulated steel strip armored low-smoke polyvinyl chloride sheath as claimed in claim 1, is characterized in that: and the tensile core is fixedly arranged in the tensile layer.

6. The flame-retardant power cable with the crosslinked polyethylene insulated steel strip armored low-smoke polyvinyl chloride sheath as claimed in claim 5, is characterized in that: the tensile core is a steel core, a carbon fiber rope or a silicon rubber rope.