CN217008750U

CN217008750U - Fire-resistant anti-aging prefabricated branch cable

Info

Publication number: CN217008750U
Application number: CN202220449211.3U
Authority: CN
Inventors: 毕先国; 蔡长威; 刘书鑫
Original assignee: Zhejiang Products Zhongda Cable Co ltd
Current assignee: Zhejiang Products Zhongda Cable Co ltd
Priority date: 2022-03-03
Filing date: 2022-03-03
Publication date: 2022-07-19
Anticipated expiration: 2032-03-03

Abstract

The utility model discloses a fire-resistant anti-aging prefabricated branch cable which comprises a main cable, branch cables and a connecting piece, wherein peeling exposed conductors are respectively formed at the compression joint parts of the main cable and the branch cables and are coated and fixed with PPS (polyphenylene sulfide) resin core materials into a whole together through the connecting piece, the main cable comprises an inner conductor, an Ethylene Propylene Diene Monomer (EPDM) isolation layer, a first high-temperature fireproof tape winding layer and a first polyvinyl chloride extruded outer sheath, the branch cables comprise a branch conductor, a nickel copper harm-proof coating, a zinc oxide isolation layer, a second high-temperature fireproof tape winding layer and a second polyvinyl chloride extruded outer sheath, and the connecting piece sequentially comprises a high-temperature glass fiber tape winding layer, a fluororubber moistureproof layer, an AFRP (atomic power fiber reinforced plastics) winding layer and a PUR (polyurethane) outer sheath from inside to outside. The cable has excellent thermal stability, fire resistance and aging resistance, can effectively inhibit the copper harm phenomenon of the insulating layer, maintains the safe reliability of the cable in long-term operation, and prolongs the service life.

Description

Fire-resistant anti-aging prefabricated branch cable

Technical Field

The application relates to the technical field of cables, in particular to a fire-resistant anti-aging prefabricated branch cable.

Background

The pre-branch cable is mainly used in distribution lines of medium and small loads and is used for high-rise buildings, disaster prevention equipment, tunnel illumination and the like. According to different application environments and purposes, in order to reduce potential safety hazards and ensure long-term normal and stable operation of a power distribution system, the pre-branch cable also needs to have excellent thermal stability, fire resistance and ageing resistance. However, the main cable of the common pre-branch cable and the cable core structure of the branch cable are both in direct contact with the insulating layer by adopting a copper conductor, so that the phenomenon of copper harm is easy to occur after long-term use, and the copper harm is that the insulating material is in direct contact with the copper conductor to generate chemical reaction, so that the oxidation resistance of an antioxidant in the insulating material is reduced, the ageing resistance of the insulating material is weakened, the time is long, the insulating material loses effectiveness, and the potential hidden danger of influencing the normal operation of the cable is formed.

SUMMERY OF THE UTILITY MODEL

This application is not enough to prior art, and the technical problem that solve provides a prefabricated branch cable of fire-resistant ageing resistance, has excellent thermal stability, fire resistance and ageing resistance concurrently, and the copper harm phenomenon that can effectual suppression insulating layer takes place, keeps the fail safe nature of cable long-term work, increase of service life.

The present application solves the above-mentioned problems by the following technical solutions.

The fireproof anti-aging prefabricated branch cable comprises a main cable, branch cables and a connecting piece, wherein peeling exposed conductors are respectively formed at the compression joint parts of the main cable and the branch cables and are wrapped and fixed together with a PPS resin core material through the connecting piece into a whole, the main cable comprises an inner conductor, an ethylene propylene diene monomer isolation layer, a first high-temperature fireproof tape wrapping layer and a first polyvinyl chloride extrusion wrapping outer sheath, the ethylene propylene diene monomer isolation layer, the first high-temperature fireproof tape wrapping layer and the first polyvinyl chloride extrusion wrapping outer sheath are sequentially wrapped outside the inner conductor, the branch cables comprise branch conductors, a nickel copper harm prevention coating, a zinc oxide blocking layer, a second high-temperature fireproof tape wrapping layer and a second polyvinyl chloride extrusion wrapping outer sheath, the first high-temperature fireproof tape wrapping layer and the second high-temperature fireproof tape wrapping layer are of a high-temperature fireproof tape multi-layer overlapping cover structure, and the high-temperature fireproof tape is of a structure formed by bonding three layers of an inner wrapping layer and an outer wrapping layer of crosslinked polyethylene resin and a mica tape interlayer together, the connecting piece comprises a high-temperature glass fiber tape wrapping layer, a fluororubber moisture-proof layer, an AFRP anti-torsion wrapping layer and a PUR outer sheath from inside to outside in sequence.

Preferably, the inner conductor is formed by twisting and pressing a plurality of tin-plated copper single wires with the diameter of 0.02mm to 0.1mm to form a circular conductor structure.

Preferably, the branch conductor is a compound stranded wire formed by concentrically twisting a plurality of stranded wires, the stranded wires are formed by twisting a plurality of tinned copper monofilament bundles with the diameter of 0.01mm to 0.04mm, and the twisting direction of the tinned copper monofilament bundles is opposite to that of the stranded wires.

Preferably, the thickness of the ethylene propylene diene monomer isolation layer is 0.1mm to 0.3 mm.

Preferably, the thickness of the nickel copper harm prevention coating is 1 μm to 5 μm.

Preferably, the thickness of the zinc oxide barrier layer is 10nm to 100 nm.

Preferably, the high-temperature glass fiber tape wrapping layer is a high-temperature glass fiber tape multi-layer overlapping and covering wrapping structure, and the overlapping rate is 15-25%.

Preferably, the thickness of the fluororubber moisture barrier is 0.2mm to 1 mm.

Preferably, the AFRP anti-twisting wrapping layer is of a double-layer aramid fiber strand structure which is reversely spirally wound and braided, and the spiral angles of the double-layer aramid fiber strand structure are different.

Preferably, the outer surface of the fluororubber moisture-proof layer and the inner surface of the PUR outer sheath are both provided with thermoplastic polyurethane bonding layers.

The beneficial effect of this application:

1. the ethylene propylene diene monomer isolation layer is additionally arranged outside the inner conductor of the main cable, so that the copper inner conductor is effectively prevented from being in direct contact with the high-temperature fireproof belt winding layer and the insulation layer, the copper harm phenomenon caused by copper ions diffusing to the insulation material is prevented, the ethylene propylene diene monomer isolation layer is excellent in heat resistance and aging resistance, has good insulation property, and is beneficial to improving the heat stability of the main cable and prolonging the service life of the main cable.

2. Through preventing the harmful coating of copper at branch conductor outside spraying nickel, block that copper inner conductor and insulating material take place direct contact, prevent effectively that copper ion from diffusing to the insulating layer and causing the harmful phenomenon of copper to take place, prevent at nickel that the harmful coating of copper outside spraying zinc oxide barrier layer can effectually protect the harmful coating of copper to take place oxidation reaction, and then, improve branch cable's ageing resistance, increase of service life.

3. The high-temperature fireproof belt is added inside the insulating layer of the main cable and the branch cable to wind the covering layer, so that a better fireproof and heat-insulation effect is achieved, the PPS resin core material has good heat resistance and high mechanical strength, the high-temperature glass fiber belt is adopted outside the PPS resin core material to wind the covering layer to replace the original PET resin, the fireproof and flame-retardant characteristics are enhanced, the time from heat conduction to the inside is effectively prolonged, the internal temperature is reduced, and the safe and normal operation of the cable is guaranteed.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present application;

fig. 2 is a schematic sectional view along the direction a-a in fig. 1.

Description of the reference numerals:

the cable comprises a main cable 1, a branch cable 2, a connecting piece 3, a PPS resin core material 4, an inner conductor 5, an ethylene propylene diene monomer isolation layer 6, a first high-temperature fireproof tape winding layer 7, a first polyvinyl chloride extruded outer sheath 8, a branch conductor 9, a nickel copper harm prevention coating 10, a zinc oxide isolation layer 11, a second high-temperature fireproof tape winding layer 12, a second polyvinyl chloride extruded outer sheath 13, a high-temperature glass fiber tape winding layer 14, a fluororubber moistureproof layer 15, an AFRP torsion-resistant winding layer 16 and a PUR outer sheath 17.

Detailed Description

The terminology used in the description of the embodiments of the present application is for the purpose of describing particular embodiments of the present application only and is not intended to be limiting of the application, as the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1 and 2, the fire-resistant anti-aging prefabricated branch cable of the embodiment of the application comprises a main cable 1, a branch cable 2 and a connecting piece 3.

And peeling exposed conductors are respectively formed at the crimping parts of the main cable 1 and the branch cable 2 and are coated and fixed together with the PPS resin core material 4 into a whole through the connecting piece 3. The main cable 1 comprises an inner conductor 5, an ethylene propylene diene monomer isolation layer 6, a first high-temperature fireproof belt winding layer 7 and a first polyvinyl chloride extruded outer sheath 8, wherein the ethylene propylene diene monomer isolation layer 6, the first high-temperature fireproof belt winding layer and the first polyvinyl chloride extruded outer sheath are sequentially wrapped outside the inner conductor 5, and specifically, the inner conductor 5 is formed by twisting and pressing a plurality of tinned copper single wires with the diameters of 0.02mm to 0.1mm to form a circular conductor structure. The thickness of the ethylene propylene diene monomer isolation layer 6 is 0.1mm to 0.3 mm. The branch cable 2 comprises a branch conductor 9, a nickel copper harm prevention coating 10, a zinc oxide barrier layer 11, a second high-temperature fireproof belt winding coating 12 and a second polyvinyl chloride extruded outer sheath 13, wherein the nickel copper harm prevention coating 10, the zinc oxide barrier layer 11, the second high-temperature fireproof belt winding coating 12 and the second polyvinyl chloride extruded outer sheath 13 are sequentially coated outside the branch conductor 9, concretely, the branch conductor 9 is a compound stranded wire formed by concentrically twisting a plurality of stranded wires, the stranded wires are formed by twisting a plurality of tinned copper monofilament bundles with the diameter of 0.01mm to 0.04mm, and the twisting direction of the tinned copper monofilament is opposite to that of the stranded wires. The thickness of the nickel copper harm prevention coating 10 is 1 to 5 μm. The zinc oxide barrier layer 11 has a thickness of 10nm to 100 nm. The first high-temperature fireproof belt winding layer 7 and the second high-temperature fireproof belt winding layer 12 are both high-temperature fireproof belt multi-layer overlapping and winding structures, and the high-temperature fireproof belt is of an integrated structure formed by bonding three layers of sandwich cores of an inner coating layer and an outer coating layer of crosslinked polyethylene resin and a mica belt interlayer.

Connecting piece 3 from interior to exterior includes high temperature glass fiber tape around covering 14, fluororubber dampproof course 15, the antitorque covering 16 of AFRP and PUR oversheath 17 in proper order, and is further, the fluororubber dampproof course 15 surface with PUR oversheath 17 internal surface all is equipped with the thermoplastic polyurethane adhesive linkage. In one embodiment, the high temperature glass fiber tape wrapping layer 14 is a high temperature glass fiber tape multi-layer overlapping wrapping structure, and the overlapping rate is 15% to 25%. In one embodiment, the AFRP twist resistant covering 16 is a double-layer aramid fiber braided structure with opposite helical winding directions and different helical angles. The thickness of the fluororubber moisture-proof layer 15 is 0.2mm to 1 mm.

Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present application, and are used to illustrate the technical solutions of the present application, but not to limit the technical solutions, and the scope of the present application is not limited to the above-mentioned embodiments, although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the exemplary embodiments of the present application, and are intended to be covered by the scope of the present application.

Claims

1. Fire-resistant ageing resistance prefabricated branch cable, characterized by: the cable comprises a main cable (1), branch cables (2) and a connecting piece (3), wherein peeling exposed conductors are formed at the compression joint parts of the main cable (1) and the branch cables (2) respectively and are coated and fixed with PPS resin core materials (4) into a whole through the connecting piece (3), the main cable (1) comprises an inner conductor (5), an Ethylene Propylene Diene Monomer (EPDM) isolation layer (6), a first high-temperature fireproof belt winding layer (7) and a first polyvinyl chloride extrusion outer sheath (8) which are sequentially coated outside the inner conductor (5), the branch cables (2) comprise branch conductors (9), and a nickel copper-damage-preventing coating (10), a zinc oxide isolation layer (11), a second high-temperature fireproof belt winding layer (12) and a second polyvinyl chloride extrusion outer sheath (13) which are sequentially coated outside the branch conductors (9), and the first high-temperature fireproof belt winding layer (7) and the second high-temperature fireproof belt winding layer (12) are both high-temperature fireproof belt multilayer coatings (3) The high-temperature fireproof belt is of a sandwich bonding integrated structure with three layers of inner and outer coating layers of crosslinked polyethylene resin and a mica tape interlayer, and the connecting piece (3) sequentially comprises a high-temperature glass fiber belt wrapping layer (14), a fluororubber moistureproof layer (15), an AFRP anti-torsion wrapping layer (16) and a PUR outer sheath (17) from inside to outside.

2. The fire-resistant anti-aging prefabricated branch cable according to claim 1, wherein: the inner conductor (5) is a round conductor structure formed by twisting and pressing a plurality of tinned copper single wires with the diameter of 0.02mm to 0.1 mm.

3. The fire-resistant anti-aging prefabricated branch cable according to claim 1, wherein: the branch conductor (9) is a compound stranded wire formed by concentrically twisting a plurality of stranded wires, the stranded wires are formed by twisting a plurality of tinned copper monofilament bundles with the diameters of 0.01mm to 0.04mm, and the twisting direction of the tinned copper monofilament is opposite to that of the stranded wires.

4. The fire-resistant anti-aging prefabricated branch cable according to claim 1, wherein: the thickness of the ethylene propylene diene monomer isolation layer (6) is 0.1mm to 0.3 mm.

5. The fire-resistant anti-aging prefabricated branch cable according to claim 1, wherein: the thickness of the nickel copper harm prevention coating (10) is 1-5 mu m.

6. The fire-resistant anti-aging prefabricated branch cable according to claim 1, wherein: the thickness of the zinc oxide barrier layer (11) is 10nm to 100 nm.

7. The fire-resistant anti-aging prefabricated branch cable according to claim 1, wherein: the high-temperature glass fiber tape wrapping layer (14) is a high-temperature glass fiber tape multi-layer lapping and covering wrapping structure, and the lapping rate is 15-25%.

8. The fire-resistant anti-aging prefabricated branch cable according to claim 1, wherein: the thickness of the fluororubber moisture-proof layer (15) is 0.2mm to 1 mm.

9. The fire-resistant anti-aging prefabricated branch cable according to claim 1, wherein: the AFRP anti-torsion lapping layer (16) is of a double-layer aramid fiber strand mutually reverse spiral winding weaving structure and different in spiral angle.

10. The fire-resistant anti-aging prefabricated branch cable according to claim 1, wherein: and thermoplastic polyurethane bonding layers are arranged on the outer surface of the fluororubber moisture-proof layer (15) and the inner surface of the PUR outer sheath (17).