CN214226548U

CN214226548U - Crosslinked polyvinyl chloride insulation armored fireproof cable

Info

Publication number: CN214226548U
Application number: CN202120201173.5U
Authority: CN
Inventors: 宗铭; 谈亮; 徐国新; 刘云昌
Original assignee: JIANGSU HONGXIANG CABLE CO Ltd
Current assignee: JIANGSU HONGXIANG CABLE CO Ltd
Priority date: 2021-01-25
Filing date: 2021-01-25
Publication date: 2021-09-17
Anticipated expiration: 2031-01-25

Abstract

The utility model provides a crosslinked polyvinyl chloride insulation armored fireproof cable, which comprises a cable core, wherein the cable core is formed by twisting a plurality of insulation wire cores; filling expansible fire-retardant block in the space of cable core, extruding the thermoplastic polyurethane elastomer packaging layer outside the expansible fire-retardant block, wrapping a first flame-retardant composite tape after coating a fireproof coating layer outside the thermoplastic polyurethane elastomer packaging layer, wrapping a glass fiber cloth rubber coating tape outside the first flame-retardant composite tape, extruding a ceramic low-smoke halogen-free polyolefin fire-resistant inner protective layer outside the glass fiber cloth rubber coating tape, weaving an armor layer outside the ceramic low-smoke halogen-free polyolefin fire-resistant inner protective layer, wrapping a second flame-retardant composite tape outside the armor layer, wrapping an adhesive fireproof wrapping tape outside the second flame-retardant composite tape, and extruding an FEP high-temperature-resistant flame-retardant outer sheath outside the adhesive fireproof wrapping tape. The safety, the flame-retardant and fireproof performance of the cable in the normal use process are improved, the service life of the cable is prolonged, and the operation cost of the power system is greatly reduced.

Description

Crosslinked polyvinyl chloride insulation armored fireproof cable

Technical Field

The utility model relates to a wire and cable field specifically is an insulating armor fireproof cable of crosslinked polyvinyl chloride.

Background

The flame retardant property of the electric wire and the cable is required to be higher, and the flame retardant grade of the cable is required to reach A class in many important places. The cross-linked polyolefin material is widely used in various cables due to its excellent electrical and mechanical properties and belongs to halogen-free materials. However, most of the cross-linked polyolefins are flammable materials, and the difficulty in producing a type a flame-retardant cable is high, so that the cable can meet the type a flame-retardant requirement only by considering aspects such as product structure, material selection and the like according to different types of cables.

The existing flame-retardant electric wire and cable generally adopts a method of adding halogen-containing halide and metal oxide into materials such as insulation, sheath and filling, etc., and is an excellent method in view of flame retardance, however, because these materials contain halides, they release a large amount of smoke and hydrogen halide gas during combustion, therefore, the visibility is low in case of fire, which causes great obstruction to the safe evacuation and fire fighting of people, and people are more suffocated to death by toxic gas, if no halide is added, the flame retardant performance of the cable is improved only on the structure of the cable, but current cable shielding layer, insulating layer and restrictive coating all closely laminate in proper order, are unfavorable for the heat dissipation of cable, in case the conflagration breaks out then can be at the time internal combustion of utmost point and shielding layer and insulating layer, and the flame retardant efficiency of cable is not very ideal, can't satisfy the requirement of in-service use.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve current problem, provide an insulating armor fireproof cable of crosslinked polyvinyl chloride, improve the security of cable in normal use and the life of extension cable to greatly reduced electric power system operation cost.

The utility model discloses a crosslinked polyvinyl chloride insulation armor fireproof cable, which comprises a cable core, wherein the cable core is formed by stranding a plurality of insulation wire cores; filling an expansible fire-retardant block in a gap of a cable core, extruding a thermoplastic polyurethane elastomer packaging layer with the thickness of 2-3mm outside the expansible fire-retardant block, coating a fireproof coating layer with the thickness of 1-2mm outside the thermoplastic polyurethane elastomer packaging layer, wrapping a first flame-retardant composite tape, wrapping a glass fiber cloth rubber coating tape outside the first flame-retardant composite tape, extruding a ceramic low-smoke halogen-free polyolefin flame-retardant inner protection layer with the thickness of 1-2mm outside the glass fiber cloth rubber coating tape, weaving an armor layer outside the ceramic low-smoke halogen-free polyolefin flame-retardant inner protection layer, wrapping a second flame-retardant composite tape outside the armor layer, wrapping an self-adhesive fireproof tape outside the second flame-retardant composite tape, and extruding a FEP high-temperature-resistant flame-retardant outer sheath with the thickness of 3-5mm outside the self-adhesive fireproof tape.

The further improvement is that the insulated wire core is composed of a conductor, a cross-linked polyvinyl chloride insulating layer extruded outside the conductor, a third flame-retardant composite belt wrapped outside the cross-linked polyvinyl chloride insulating layer and an epoxy resin packaging layer packaged outside the third flame-retardant composite belt.

The first flame-retardant composite belt and the second flame-retardant composite belt are respectively composed of a nylon sheath with the inner layer thickness of 0.3mm, a ceramic fireproof and fireproof composite belt with the middle layer thickness of 0.3mm and a high-temperature fireproof mud layer with the outer layer thickness of 0.3 mm.

The third flame-retardant composite belt comprises a glass fiber belt with the thickness of 0.25mm, a copper strip shielding layer with the thickness of 0.25mm is woven outside the glass fiber belt, and a low-smoke halogen-free flame-retardant polyolefin protective layer with the thickness of 0.25mm is extruded outside the copper strip shielding layer after a semi-conductive water-blocking belt with the thickness of 0.25mm is wrapped.

Further improved, the conductor is a rare earth high-iron aluminum alloy conductor.

In a further improvement, the armor layer is composed of a plurality of annularly distributed reinforcing cores with the diameter of 2.5mm, and the reinforcing cores are graphene fiber bodies.

The utility model has the advantages that:

1. the conductor adopts a rare earth high-iron aluminum alloy conductor, and not only has various performance indexes of the high-elongation aluminum alloy material for the cable, but also has more excellent heat resistance and corrosion resistance, so that the cable has larger current-carrying capacity;

2. the cable is sealed by the epoxy resin packaging layer, so that the cable has high strength and rigidity, good chemical medium resistance stability, excellent electrical insulation, good temperature resistance, low water absorption and good tightness for the cable core;

3. the gap of the cable core is filled with an expansive fire-retardant block 5, so that the cable is pollution-free: the whole product is composed of a plurality of organic substances, is dissolved in natural environment, and can not generate gas when meeting fire: no flying smoke, no falling off, good heat insulation effect, quick heat dissipation, good water resistance, oil resistance, acid and alkali resistance and long fire-resistant time; high mechanical strength and elasticity: because the nontoxic organic high molecular material is adopted for crosslinking and die pressing solidification, the actually measured compressive strength of 5.6MP is 6 times higher than the national standard (0.8 MP) and is 112 times of that of the fire retardant package (0.05 MP);

4. the utility model discloses cable structure is simple, improves the security of cable in normal use and the life of extension cable to greatly reduced electric power system operation cost.

Drawings

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a schematic structural view of a third flame retardant composite tape;

FIG. 3 is a schematic structural view of a first flame retardant composite tape.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the following detailed description.

As shown in fig. 1-3, the utility model relates to a crosslinked polyvinyl chloride insulation armored fireproof cable, which comprises a cable core, wherein the cable core is formed by twisting a plurality of insulation wire cores; the insulated wire core is composed of a conductor 1, a cross-linked polyvinyl chloride insulating layer 2 extruded outside the conductor, a third flame-retardant composite belt 3 wrapped outside the cross-linked polyvinyl chloride insulating layer and an epoxy resin packaging layer 4 packaged outside the third flame-retardant composite belt; the conductor is a rare earth high-iron aluminum alloy conductor, and not only has various performance indexes of the high-elongation aluminum alloy material for the cable, but also has more excellent heat resistance and corrosion resistance, so that the conductor has larger current-carrying capacity; the epoxy resin packaging layer enables the cable to have high strength and high rigidity, good chemical medium resistance stability, excellent electrical insulation, good temperature resistance, low water absorption and good tightness for the wire core; the third flame-retardant composite belt comprises a glass fiber belt 31 with the thickness of 0.25mm, a copper strip shielding layer 32 with the thickness of 0.25mm is woven outside the glass fiber belt, and a low-smoke halogen-free flame-retardant polyolefin protective layer 34 with the thickness of 0.25mm is extruded after a semi-conductive water-blocking belt 33 with the thickness of 0.25mm is wrapped outside the copper strip shielding layer; the glass fiber belt has the advantages of high temperature resistance, heat preservation and insulation, fire prevention, flame retardance, corrosion resistance, aging resistance, weather resistance, high strength and smooth appearance; the semi-conductive water-blocking tape has the characteristics of strong hygroscopicity, large expansion rate and high expansion rate, the product has small resistance and semi-conductive property, can effectively buffer and weaken the electric field intensity, has high mechanical strength, is easy for the wrapping and longitudinal wrapping processing of various cables, has good heat resistance and high instant temperature resistance, and can keep stable performance of the cables at the instant high temperature; the low-smoke halogen-free flame-retardant polyolefin cable generates little smoke under the condition of flame combustion, and the released gas does not contain halogen elements and is nontoxic, so that the cable has environmental protection property; through the compounding of all the layers, the performance of the whole flame-retardant composite belt is further improved, and all the performances of the cable are also greatly improved, so that the flame-retardant composite belt is superior to the flame-retardant belt with a single structure;

the gap of the cable core is filled with an expansive fire-retardant block 5, so that the cable is pollution-free: the whole product is composed of a plurality of organic substances, is dissolved in natural environment, and can not generate gas when meeting fire: no flying smoke, no falling off, good heat insulation effect, quick heat dissipation, good water resistance, oil resistance, acid and alkali resistance and long fire-resistant time; high mechanical strength and elasticity: because the nontoxic organic high molecular material is adopted for crosslinking and die pressing solidification, the actually measured compressive strength of 5.6MP is 6 times higher than the national standard (0.8 MP) and is 112 times of that of the fire retardant package (0.05 MP); the thermoplastic polyurethane elastomer packaging layer 6 with the thickness of 2-3mm is extruded outside the expansible fire-retardant block, so that the cable has excellent wear resistance, excellent ozone resistance, large hardness, high strength, good elasticity, low temperature resistance, good oil resistance, chemical resistance and environmental resistance; the packaging material is characterized in that a fireproof coating layer 7 with the thickness of 1-2mm is coated outside a thermoplastic polyurethane elastomer packaging layer, then a first flame-retardant composite tape 8 is wrapped, a glass fiber cloth adhesive tape 9 is wrapped outside the first flame-retardant composite tape, the first flame-retardant composite tape is a specially treated glass fiber fabric, and the glass fiber fabric has a compact tissue structure and high temperature resistance, can well protect an object from a heat point and a spark zone, can thoroughly prevent combustion or isolate combustion, has the characteristics of softness and heat resistance, has the heat resistance temperature of up to 550 ℃ and high temperature, and has low volume weight, thermal vibration resistance and chemical corrosion resistance; the belt body is thin, the strength is high, the impact resistance is high, the performance is good, the interlayer bonding strength is high, the flexibility is excellent, and the service life is long; the manufacturing method comprises the following steps of extruding a ceramic low-smoke halogen-free polyolefin fire-resistant inner sheath layer 10 with the thickness of 1-2mm outside a glass fiber cloth glue coating tape, weaving an armor layer 11 outside the ceramic low-smoke halogen-free polyolefin fire-resistant inner sheath layer, wherein the armor layer is composed of a plurality of annularly distributed reinforcing cores 15 with the diameter of 2.5mm, and the reinforcing cores are graphene fiber bodies, so that the tensile strength and flexibility of the cable are improved, the weight is light, the overall weight of the cable is reduced, and the mechanical strength is high; a second flame-retardant composite belt 12 is wrapped outside the armor layer, the first flame-retardant composite belt and the second flame-retardant composite belt are respectively composed of a nylon sheath 121 with the inner layer thickness of 0.3mm, a ceramic fireproof and fire-resistant composite belt 122 with the middle layer wrapping thickness of 0.3mm and a high-temperature fireproof mud layer 123 with the outer layer extrusion wrapping thickness of 0.3mm, a three-layer fireproof and flame-retardant composite structure is arranged from inside to outside, so that the fireproof and flame-retardant effect of the flame-retardant composite belt is several times of that of the original single structure, and the flame-retardant composite belt also has heat resistance, wear resistance, chemical resistance and self-lubricity, is formed by rolling and compounding ceramic fireproof and fire-resistant silicon rubber and high-temperature resistant glass fiber cloth, begins to harden under the conditions of flame or flameless conditions of 650 ℃ and above, can reach 3000 ℃ at most, and is rapidly burnt into a ceramic-shaped hard complete shell along with the rise of temperature, the longer ablation time and the higher temperature, The harder the shell is, the armored hard shell after burning has a good protection effect on the cable, the smoothness of the cable under the fire disaster condition is guaranteed, the armored hard shell can be used as a flame-retardant layer and an insulating layer, the fireproof mud has the effects of flame retardance, spreading prevention and blocking, and the fire-resistant grade of the whole composite belt can reach the A-grade standard of GB/T12666;

the second flame-retardant composite tape is externally wrapped with a self-adhesive fireproof wrapping tape 13 which is a ZFBD-66 type self-adhesive fireproof wrapping tape, 1/2 or 1/3 (2 layers or 3 layers are wound, and the fireproof and flame-retardant performance is better when 3 layers are wound) is wound in a tower-type wrapping manner, when a cable is on fire, the wrapping tape forms a heat-insulating and oxygen-resistant carbonized layer to protect the wound cable, so that flame is prevented from expanding and burning along the cable, the cable can be protected from being damaged in a certain time, and the normal operation of power transmission and communication signals is guaranteed; the FEP high-temperature-resistant flame-retardant outer sheath 14 with the thickness of 3-5mm is extruded outside the self-adhesive fireproof wrapping belt, can be continuously used within the temperature range of-85 to +200 ℃, does not deteriorate even under the limit conditions of-200 ℃ and +260 ℃, and can be used in a short time; the cable has the advantages of environmental protection, flame retardance, high and low temperature resistance, good flexibility, easy processability, good mechanical property and temperature resistance, no need of irradiation crosslinking and capability of meeting various requirements of the cable.

The utility model discloses the concrete application way is many, and the above-mentioned only is the preferred embodiment of the utility model, should point out, to ordinary skilled person in this technical field, under the prerequisite that does not deviate from the utility model discloses the principle, can also make a plurality of improvements, and these improvements also should be regarded as the utility model discloses a scope of protection.

Claims

1. The utility model provides an insulating armoured fireproof cable of crosslinked polyvinyl chloride which characterized in that: the cable comprises a cable core, wherein the cable core is formed by stranding a plurality of insulating wire cores; filling an expansible fire-retardant block in a gap of a cable core, extruding a thermoplastic polyurethane elastomer packaging layer with the thickness of 2-3mm outside the expansible fire-retardant block, coating a fireproof coating layer with the thickness of 1-2mm outside the thermoplastic polyurethane elastomer packaging layer, wrapping a first flame-retardant composite tape, wrapping a glass fiber cloth rubber coating tape outside the first flame-retardant composite tape, extruding a ceramic low-smoke halogen-free polyolefin flame-retardant inner protection layer with the thickness of 1-2mm outside the glass fiber cloth rubber coating tape, weaving an armor layer outside the ceramic low-smoke halogen-free polyolefin flame-retardant inner protection layer, wrapping a second flame-retardant composite tape outside the armor layer, wrapping an self-adhesive fireproof tape outside the second flame-retardant composite tape, and extruding a FEP high-temperature-resistant flame-retardant outer sheath with the thickness of 3-5mm outside the self-adhesive fireproof tape.

2. The crosslinked polyvinyl chloride insulated armored flameproof cable of claim 1, wherein: the insulated wire core is composed of a conductor, a cross-linked polyvinyl chloride insulating layer extruded outside the conductor, a third flame-retardant composite belt wrapped outside the cross-linked polyvinyl chloride insulating layer, and an epoxy resin packaging layer packaged outside the third flame-retardant composite belt.

3. The crosslinked polyvinyl chloride insulated armored flameproof cable of claim 1, wherein: the first flame-retardant composite belt and the second flame-retardant composite belt are respectively composed of a nylon sheath with the inner layer thickness of 0.3mm, a ceramic fireproof and fire-resistant composite belt with the middle layer thickness of 0.3mm and a high-temperature fireproof mud layer with the outer layer thickness of 0.3 mm.

4. The crosslinked polyvinyl chloride insulated armored flameproof cable of claim 2, wherein: the third flame-retardant composite belt comprises a glass fiber belt with the thickness of 0.25mm, a copper strip shielding layer with the thickness of 0.25mm is woven outside the glass fiber belt, and a low-smoke halogen-free flame-retardant polyolefin protective layer with the thickness of 0.25mm is extruded outside the copper strip shielding layer after a semi-conductive water-blocking belt with the thickness of 0.25mm is wrapped.

5. The crosslinked polyvinyl chloride insulated armored flameproof cable of claim 2, wherein: the conductor is a rare earth high-iron aluminum alloy conductor.

6. The crosslinked polyvinyl chloride insulated armored flameproof cable of claim 1, wherein: the armor layer consists of a plurality of annularly distributed reinforcing cores with the diameter of 2.5 mm.

7. The crosslinked polyvinyl chloride insulated armored flameproof cable of claim 6, wherein: the reinforcing core is a graphene fiber body.