CN217655683U

CN217655683U - Underground special cable

Info

Publication number: CN217655683U
Application number: CN202221969477.7U
Authority: CN
Inventors: 王浩冲; 倪俊彬; 王浩鹏; 王晓君; 陈楚敏
Original assignee: Jiangxi Youshan Wire And Cable Co ltd
Current assignee: Jiangxi Youshan Wire And Cable Co ltd
Priority date: 2022-07-28
Filing date: 2022-07-28
Publication date: 2022-10-25
Anticipated expiration: 2032-07-28

Abstract

The utility model relates to an underground special cable constitutes through being provided with crust, fire prevention filling layer, heart yearn protective sheath and a plurality of heart yearn, the heart yearn is wrapped up in the heart yearn protective sheath, the fire prevention filling layer sets up between heart yearn protective sheath skin and crust inlayer, evenly be provided with a plurality of trapezoidal archs on the crust, form trapezoidal recess between the trapezoidal arch of every adjacent, the heart yearn includes by outer fire protection layer, high temperature resistant insulating layer, dampproofing protective layer, conductor insulation layer and the stranded conductor that sets gradually in to. This underground private cable has satisfied underground works, like subway, submarine tunnel and underground city are to the high performance demand of cable, has excellent security, fire resistance and humidity resistance, and in addition, the design of trapezoidal arch and trapezoidal recess makes the process of laying more smooth, also is convenient for overhaul the circuit in the future, when excavating the cable, reduces the damage to the cable as far as possible.

Description

Underground special cable

Technical Field

The utility model relates to a relevant technical field of cable, in particular to underground special cable.

Background

With the development of science and technology, especially the construction and development of underground engineering fields, such as underground railways, submarine tunnels and underground cities, the arrangement of circuits cannot be separated, and the safety, fire prevention, moisture prevention and convenient laying and maintenance of the cables, which are essential for the circuit arrangement, are the problems to be solved urgently at present.

For this reason, it is necessary to provide a dedicated cable for underground use.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main objective is overcome the not enough that exists among the prior art, provides an underground special cable for solve prior art's problem.

In order to realize the purpose, according to the utility model provides a technical scheme is: underground private cable includes by outer crust, fire prevention filling layer, heart yearn protective sheath and a plurality of heart yearn that sets gradually toward interior, the heart yearn is wrapped up in the heart yearn protective sheath, the fire prevention filling layer sets up between heart yearn protective sheath skin and crust inlayer, evenly be provided with a plurality of trapezoidal archs on the crust, form trapezoidal recess between the trapezoidal arch of every adjacent, the heart yearn includes by outer fire protection layer, high temperature resistant insulating layer, dampproofing protective layer, conductor insulation layer and the stranded conductor that sets gradually in to.

As a further aspect of the present invention, the present invention is characterized in that: the fireproof filling layer is arranged as a magnesium oxide powder layer.

As a further aspect of the present invention, there is provided: the number of the core wires is at least 1.

As a further aspect of the present invention, there is provided: the fireproof protective layer is an alloy wire and ceramic fiber composite layer.

As a further aspect of the present invention, there is provided: the high-temperature-resistant insulating layer is set to be a high silica glass fiber band winding cladding.

As a further aspect of the present invention, there is provided: the moisture-proof protective layer is a crosslinked polyethylene layer.

As a further aspect of the present invention, the present invention is characterized in that: the conductor insulating layer is a nylon tape wrapping layer.

As a further aspect of the present invention, there is provided: the conductor is set to be at least 2 strands, and each strand is formed by twisting 2-20 bare soft copper wires.

Compared with the prior art, the utility model discloses beneficial effect:

this secret private cable constitutes through crust, fire prevention filling layer, heart yearn protective sheath and a plurality of heart yearn by outer toward interior setting gradually, the heart yearn is wrapped up in the heart yearn protective sheath, the fire prevention filling layer sets up between heart yearn protective sheath skin and crust inlayer, evenly be provided with a plurality of trapezoidal archs on the crust, form trapezoidal recess between the trapezoidal arch of every adjacent, the heart yearn includes by outer fire protection layer, high temperature resistant insulating layer, dampproofing protective layer, conductor insulation layer and the stranded conductor that sets gradually in to. The underground special cable meets the high-performance requirements of underground engineering such as underground railways, submarine tunnels and underground cities on the cable, and achieves the beneficial effects of safety, fire prevention, moisture prevention and convenience in laying and maintenance.

Drawings

Fig. 1 is the utility model discloses a cross-sectional structure schematic diagram of underground special cable.

Fig. 2 is a schematic cross-sectional view of the core wire of the cable for underground application.

Fig. 3 is a schematic cross-sectional view of the conductor insulation layer and the conductor core wire of the special cable for underground use according to the present invention.

Description of elements in the drawings: 10-outer skin; 11-trapezoidal protrusions; 12-a trapezoidal groove; 20-fireproof filling layer; 30-core wire protective jacket; 40-a core wire; 41-fireproof protective layer; 42-high temperature resistant insulating layer; 43-moisture protection layer; 44-conductor insulation layer; 45-conductor.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Please refer to fig. 1-3, in an embodiment of the present invention, an underground special cable includes a sheath 10, a fireproof filling layer 20, a core wire protection sleeve 30 and a plurality of core wires 40, which are sequentially arranged from outside to inside, the core wires 40 are wrapped in the core wire protection sleeve 30, the fireproof filling layer 20 is arranged between the outer layer of the core wire protection sleeve 30 and the inner layer of the sheath 10, the sheath 10 is uniformly provided with a plurality of trapezoidal protrusions 11, trapezoidal grooves 12 are formed between every two adjacent trapezoidal protrusions 11, and the core wires 40 include a fireproof protection layer 41, a high temperature insulation layer 42, a moisture-proof protection layer 43, a conductor insulation layer 44 and a multi-strand conductor 45, which are sequentially arranged from outside to inside. This underground special cable has satisfied underground works, like subway, submarine tunnel and underground city to the high performance demand of cable, in addition, trapezoidal arch 11 and trapezoidal recess 12's design, the underground special cable of cable laying personnel of being convenient for when laying or when maintaining grips, makes the laying process more smooth, also is convenient for overhaul the circuit in the future, when excavating the cable, reduces the damage to the cable as far as possible.

Preferably, in the underground special cable, the fireproof filling layer 20 is a magnesium oxide powder layer. The magnesia powder layer has high fireproof and insulating performance, and may be burnt at over 1000 deg.c to convert into crystal and heated to 1500-2000 deg.c to form magnesia or sintered magnesia, and this can raise the safety of the underground cable effectively.

Preferably, in the underground exclusive use cable, the number of the core wires 40 is at least 1. The selection is convenient to be carried out according to the actual requirement, and the waste is avoided.

Preferably, in the underground cable, the fireproof protective layer 41 is a composite layer of alloy wires and ceramic fibers. The alloy wire and ceramic fiber composite layer has double protection effects on the cable, and the fireproof performance of the cable is better improved.

Preferably, in the underground cable, the high temperature insulating layer 42 is provided as a high silica glass fiber tape-wound cladding. The high silica glass fiber tape wrapping layer can also keep good strength and elasticity for a long time when the environmental temperature reaches 1000 ℃, can continuously resist the temperature of 1000 ℃, can resist the temperature of 1400 ℃ for a short time, does not contain asbestos, and is nontoxic and harmless.

Preferably, in the underground cable, the moisture-proof protection layer 43 is a crosslinked polyethylene layer. The crosslinked polyethylene has excellent waterproof and moistureproof properties, and can prevent the influence of underground humid environment on the safety of the cable.

Preferably, in the special underground cable, the conductor insulation layer 44 is a nylon tape wrapping layer. The design of the nylon tape wrapping layer reduces friction on the conductor 45 when the cable is bent.

Preferably, in the underground special cable, the conductor 45 is provided with at least 2 strands, and each strand is formed by twisting 2 to 20 bare soft copper wires. The selection is convenient to be carried out according to the actual requirement, and the waste is avoided.

Example 1

Please refer to fig. 1-3, in the embodiment of the present invention, an underground special cable includes a sheath 10, a fireproof filling layer 20, a core wire protection sleeve 30 and a plurality of core wires 40, which are sequentially arranged from outside to inside, the core wires 40 are wrapped in the core wire protection sleeve 30, the fireproof filling layer 20 is arranged between the outer layer of the core wire protection sleeve 30 and the inner layer of the sheath 10, a plurality of trapezoidal protrusions 11 are uniformly arranged on the sheath 10, a trapezoidal groove 12 is formed between every adjacent trapezoidal protrusions 11, and the core wires 40 include a fireproof protection layer 41, a high temperature insulation layer 42, a moisture-proof protection layer 43, a conductor insulation layer 44 and a multi-strand conductor 45, which are sequentially arranged from outside to inside.

The fire-retardant filling layer 20 is provided as a magnesium oxide powder layer.

The number of the core wires 40 is set to 3.

The fireproof protection layer 41 is an alloy wire and ceramic fiber composite layer.

The refractory insulating layer 42 is provided as a high silica glass fiber tape-wrapped cladding.

The moisture-proof protective layer 43 is provided as a cross-linked polyethylene layer.

The conductor insulation layer 44 is provided as a nylon tape wrapping.

The conductor 45 is provided with 5 strands, and each strand is formed by twisting 19 bare soft copper wires.

Example 2

The embodiment of the utility model provides an in, underground private cable, include by outer sheath 10, fire prevention filling layer 20, heart yearn protective sheath 30 and a plurality of heart yearn 40 that sets gradually inwards, heart yearn 40 is wrapped up in heart yearn protective sheath 30, fire prevention filling layer 20 sets up between the outer and 10 inlayers of crust of heart yearn protective sheath 30, evenly be provided with a plurality of trapezoidal archs 11 on the sheath 10, form trapezoidal recess 12 between every adjacent trapezoidal arch 11, heart yearn 40 includes by outer fire protection layer 41, high temperature resistant insulating layer 42, moisture protection layer 43, conductor insulation layer 44 and the stranded conductor 45 that sets gradually in to.

The number of the core wires 40 is set to 5.

The moisture-proof protective layer 43 is provided as a crosslinked polyethylene layer.

The conductor insulation layer 44 is provided as a nylon tape wrapping.

The conductors 45 are arranged into 10 strands, and each strand is formed by twisting 2 bare soft copper wires.

Example 3

The number of the core wires 40 is at least 1.

The refractory insulating layer 42 is provided as a high silica glass fibre tape wrapped cladding.

The conductor insulation layer 44 is provided as a nylon tape wrapping.

The conductor 45 is provided with 3 strands, and each strand is formed by stranding 20 bare soft copper wires.

The above detailed description is specific to one possible embodiment of the present invention, but the embodiment is not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. An underground special cable, its characterized in that: include by outer crust (10), fire prevention filling layer (20), heart yearn protective sheath (30) and a plurality of heart yearn (40) that sets gradually in toward, heart yearn (40) are wrapped up in heart yearn protective sheath (30), fire prevention filling layer (20) set up between heart yearn protective sheath (30) skin and crust (10) inlayer, evenly be provided with a plurality of trapezoidal archs (11) on crust (10), form trapezoidal recess (12) between every adjacent trapezoidal arch (11), heart yearn (40) include by outer fire protection layer (41), high temperature resistant insulating layer (42), dampproofing protective layer (43), conductor insulation layer (44) and stranded conductor (45) that set gradually in to.

2. An underground utility cable according to claim 1, wherein: the fireproof filling layer (20) is arranged as a magnesium oxide powder layer.

3. An underground utility cable according to claim 1, wherein: the number of the core wires (40) is at least 1.

4. An underground utility cable according to claim 1, wherein: the fireproof protective layer (41) is an alloy wire and ceramic fiber composite layer.

5. An underground utility cable according to claim 1, wherein: the high temperature resistant insulating layer (42) is provided as a high silica glass fiber tape wrap.

6. An underground utility cable according to claim 1, wherein: the moisture-proof protective layer (43) is arranged as a cross-linked polyethylene layer.

7. An underground utility cable according to claim 1, wherein: the conductor insulation layer (44) is arranged to be a nylon tape wrapping layer.

8. An underground utility cable according to claim 1, wherein: the conductor (45) is at least 2 strands, and each strand is formed by twisting 2-20 bare soft copper wires.