CN217485138U

CN217485138U - Power cable based on multiple flame-retardant structure

Info

Publication number: CN217485138U
Application number: CN202221308112.XU
Authority: CN
Inventors: 沈在安; 朱高骏; 万宝祥
Original assignee: Jiangsu Changdejia Cable Co ltd
Current assignee: Jiangsu Changdejia Cable Co ltd
Priority date: 2022-05-27
Filing date: 2022-05-27
Publication date: 2022-09-23
Anticipated expiration: 2032-05-27

Abstract

The utility model discloses a power cable based on multiple fire-retardant structure, including a plurality of cable cores, the cable core outside has set gradually first outer fire-retardant layer, the second insulating layer, the armor, second outer fire-retardant layer and outer jacket from inside to outside, be provided with a supporting framework between a plurality of cable cores, supporting framework includes circular stay tube and the many support bars of setting in the stay tube outside, the cable core includes the conductor that sets gradually from inside to outside, first inner fire-retardant layer, first insulating layer, second inner fire-retardant layer and inner jacket, it has the asbestos filling layer to fill between cable core and the first outer fire-retardant layer, first inner fire-retardant layer is the mica tape around the covering; the second inner flame-retardant layer is a low-smoke halogen-free high-flame-retardant wrapping layer; the utility model discloses set up the outer fire-retardant layer of fire-retardant layer in first interior fire-retardant layer, the second, first outer fire-retardant layer and second, made this power cable's flame retardant efficiency good through setting up multiple fire-retardant layer, set up support chassis simultaneously for the support effect of this cable is good.

Description

Power cable based on multiple flame-retardant structure

Technical Field

The utility model belongs to the technical field of the cable, especially, relate to a power cable based on multiple fire-retardant structure.

Background

The power cable is used for transmitting and distributing electric energy, and is commonly used for urban underground power grids, power station leading-out lines, power supply inside industrial and mining enterprises and power transmission lines under river-crossing seawater.

The flame retardant layer of traditional power cable generally only has one deck or two-layer, and this kind of power cable's flame retardant efficiency is not good, can maintain normal power transmission's time short when meetting the condition of a fire, and then can influence the opportunity of fleing, and the cable is inside not to set up bearing structure moreover for the bearing effect of cable is poor, is dragging torsional in-process cable core and receives the damage easily, thereby influences the life of cable.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: the utility model discloses aim at solving the defect among the prior art, provide a power cable based on multiple fire-retardant structure.

The technical scheme is as follows: a power cable based on a multiple flame-retardant structure comprises a plurality of cable cores, wherein a first outer flame-retardant layer, a second insulating layer, an armor layer, a second outer flame-retardant layer and an outer protective layer are sequentially arranged on the outer side of each cable core from inside to outside, a supporting framework is arranged among the cable cores, the supporting framework comprises a round supporting tube and a plurality of supporting bars arranged outside the supporting tube, the cable core is arranged between two adjacent supporting bars, the outer wall of the supporting tube is provided with a plurality of holding grooves, the number of the holding grooves is equal to that of the cable cores, the holding grooves correspond to the cable cores one by one, each holding groove is internally provided with one cable core, the cable core comprises a conductor, a first inner flame-retardant layer, a first insulating layer, a second inner flame-retardant layer and an inner protective layer which are sequentially arranged from inside to outside, an asbestos filling layer is filled between the cable core and the first outer flame-retardant layer, and the first inner flame-retardant layer is a mica tape wrapping layer; the second inner flame-retardant layer is a low-smoke halogen-free high-flame-retardant wrapping layer.

Furthermore, a through hole is formed in the supporting tube along the length direction of the cable, and a tensile rope penetrating through the through hole is arranged at the through hole;

the tensile rope is arranged in the supporting pipe, so that the tensile effect of the cable is improved.

Further, the first outer flame-retardant layer is a glass fiber woven layer or a low-smoke halogen-free high-flame-retardant wrapping layer;

and a glass fiber woven layer or a low-smoke halogen-free high-flame-retardant wrapping layer is adopted, so that the flame-retardant effect of the cable is good.

Further, the second outer flame-retardant layer is a ceramic silicon rubber layer or a mica tape lapping layer;

and a ceramic silicon rubber layer or a mica tape wrapping layer is adopted, so that the flame retardant effect of the cable is further improved.

Furthermore, the cable core, the support bar and the quantity of holding tank is 3.

Further, the accommodating groove is an arc-shaped accommodating groove;

arc holding tank and circular shape cable core cooperation degree are high, and are effectual to the location of cable core.

Furthermore, the tensile rope is formed by stranding a plurality of polyolefin fibers;

the tensile rope formed by stranding a plurality of polyolefin fibers has high strength, so that the tensile strength of the cable is improved.

Has the beneficial effects that: the utility model discloses set up the outer fire-retardant layer of fire-retardant layer in first interior fire-retardant layer, the second, first outer fire-retardant layer and second, made this power cable's flame retardant efficiency good through setting up multiple fire-retardant layer, set up support chassis simultaneously for the support effect of this cable is good.

Drawings

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

FIG. 2 is an enlarged view of the point A of FIG. 1;

FIG. 3 is a cross-sectional view of the present invention;

reference numerals: 1, a cable core; 1.1 a conductor; 1.2 a first inner flame retardant layer; 1.3 an insulating layer; 1.4 a second inner flame retardant layer; 1.5 inner protecting layer; 2 an asbestos-filled layer; 3 a first outer flame retardant layer; 4 a second insulating layer; 5, an armor layer; 6 a second outer flame retardant layer; 7, an outer protective layer; 8 supporting the framework; 8.1 supporting the tube; 8.2, supporting strips; 8.3 accommodating grooves; 8.4 through holes; 9 tensile cords.

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.

As shown in fig. 1-3: a power cable based on a multiple flame-retardant structure comprises a plurality of cable cores 1, wherein a first outer flame-retardant layer 3, a second insulating layer 4, an armor layer 5, a second outer flame-retardant layer 6 and an outer protective layer 7 are sequentially arranged outside the cable cores 1 from inside to outside, a supporting framework 8 is arranged between the cable cores 1, the supporting framework 8 comprises a circular supporting tube 8.1 and a plurality of supporting bars 8.2 arranged outside the supporting tube 8.1, one cable core 1 is arranged between two adjacent supporting bars 8.2, a plurality of accommodating grooves 8.3 are arranged on the outer wall of the supporting tube 8.1, the accommodating grooves 8.3 are equal to the cable cores 1 in number and correspond to one another one by one, one cable core 1 is accommodated in each accommodating groove 8.3, each cable core 1 comprises a conductor 1.1, a first inner flame-retardant layer 1.2, a first insulating layer 1.3, a second inner flame-retardant layer 1.4 and an inner protective layer 1.5 which are sequentially arranged from inside to outside, an asbestos filling layer 2 is filled between the cable core 1 and the first outer flame-retardant layer 3, and the first inner flame-retardant layer 1.2 is a mica tape wrapping layer; and the second inner flame-retardant layer 1.4 is a low-smoke halogen-free high-flame-retardant wrapping layer.

A through hole 8.4 is formed in the support tube 8.1 along the length direction of the cable, and a tensile rope 9 penetrating through the through hole is arranged at the through hole 8.4; the first outer flame-retardant layer 3 is a glass fiber woven layer or a low-smoke halogen-free high-flame-retardant wrapping layer; the second outer flame-retardant layer 6 is a ceramic silicon rubber layer or a mica tape lapping layer; the number of the cable cores 1, the number of the supporting strips 8.2 and the number of the accommodating grooves 8.3 are all 3; the accommodating groove 8.3 is an arc-shaped accommodating groove 8.3; the tensile rope 9 is formed by stranding a plurality of polyolefin fibers.

The working principle is as follows: the arc holding tank that the stay tube department of braced frame set up can hold the cable core to fix a position the cable core, the support bar separates the cable core, except can playing the supporting role to the cable, can also prevent that the cable from taking place the friction and damage pulling and twisting between the in-process cable core, tensile rope then can further improvement cable's tensile effect.

The utility model discloses set up fire-retardant layer outside fire-retardant layer in first interior fire-retardant layer, the second, first outer fire-retardant layer and the second, made this power cable's flame retardant efficiency good through setting up multiple fire-retardant layer, set up support chassis simultaneously for the support effect of this cable is good.

Although the invention has been shown and described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the invention as defined in the following claims.

Claims

1. The utility model provides a power cable based on multiple fire-retardant structure, includes a plurality of cable cores (1), its characterized in that: the cable core (1) outside has set gradually first outer fire-retardant layer (3), second insulating layer (4), armor (5), the outer fire-retardant layer (6) of second and outer jacket (7) by inside to outside, and is a plurality of be provided with a braced frame (8) between cable core (1), braced frame (8) include circular shape stay tube (8.1) and set up many support bars (8.2) in stay tube (8.1) outside, are provided with one between two adjacent support bars (8.2) cable core (1), the outer wall of stay tube (8.1) is provided with a plurality of holding tanks (8.3), holding tank (8.3) with the quantity of cable core (1) equals and one-to-one, every hold in holding tank (8.3) one cable core (1), cable core (1) include conductor (1.1), first interior fire-retardant layer (1.2) that set gradually by inside to outside, first interior fire-retardant layer (1.2), The cable comprises a first insulating layer (1.3), a second inner flame-retardant layer (1.4) and an inner protective layer (1.5), wherein an asbestos filling layer (2) is filled between the cable core (1) and the first outer flame-retardant layer (3), and the first inner flame-retardant layer (1.2) is a mica tape wrapping layer; and the second inner flame-retardant layer (1.4) is a low-smoke halogen-free high-flame-retardant wrapping layer.

2. The multiple flame retardant structure-based power cable of claim 1, wherein: the supporting tube (8.1) is provided with a through hole (8.4) along the length direction of the cable, and a tensile rope (9) penetrating through the through hole is arranged at the through hole (8.4).

3. The multiple flame retardant structure-based power cable of claim 1, wherein: first outer fire-retardant layer (3) are glass fiber weaving layer or low smoke and zero halogen high fire-retardant around covering.

4. The multiple flame retardant structure-based power cable according to claim 1, wherein: the second outer flame-retardant layer (6) is a ceramic silicon rubber layer or a mica tape wrapping layer.

5. The multiple flame retardant structure-based power cable according to claim 1, wherein: the cable core (1), the supporting strips (8.2) and the number of the accommodating grooves (8.3) are all 3.

6. The multiple flame retardant structure-based power cable according to claim 1, wherein: the accommodating grooves (8.3) are arc-shaped accommodating grooves (8.3).

7. The multiple flame retardant structure-based power cable according to claim 2, wherein: the tensile rope (9) is formed by stranding a plurality of polyolefin fibers.