CN212624920U

CN212624920U - Cross-linked polyethylene insulated medium-voltage cable

Info

Publication number: CN212624920U
Application number: CN202021566905.2U
Authority: CN
Inventors: 蒋军熙; 卫宇
Original assignee: Jiangsu Kaida Cable Co ltd
Current assignee: Jiangsu Kaida Cable Co ltd
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2021-02-26
Anticipated expiration: 2030-07-31

Abstract

The utility model discloses a crosslinked polyethylene insulated medium voltage cable, including the crosslinked polyethylene pipe body, the inside of crosslinked polyethylene pipe body evenly is equipped with the cable core of annular arrangement, the lateral wall cover of cable core is equipped with insulating cover, the inside wall fixedly connected with insulating layer of crosslinked polyethylene pipe body, the insulating layer includes graphite alkene heat insulating block and graphite alkene heat insulating sheet, graphite alkene heat insulating sheet is located the annular arrangement the inboard of cable core, the quantity of graphite alkene heat insulating sheet is the same with the quantity of cable core, graphite alkene heat insulating sheet with the cable core interval sets up; cut apart many cable cores through the insulating layer for the heat that many cable cores work produced can not assemble together, improves the security performance of this cable, cooperates through first heat-conducting layer, heat conduction copper sheet and second heat-conducting layer after that, gives off the inside heat of this cable to the external world fast, avoids because the heat piles up the condition that leads to short circuit, conflagration and appears.

Description

Cross-linked polyethylene insulated medium-voltage cable

Technical Field

The utility model relates to a power cable technical field specifically is an insulating medium voltage cable of crosslinked polyethylene.

Background

Polyethylene (PE) crosslinking technology is one of the important means to improve the material properties. The performance of the PE modified by crosslinking can be greatly improved, the comprehensive performances of the PE, such as mechanical property, environmental stress cracking resistance, chemical corrosion resistance, creep resistance, electrical property and the like, are remarkably improved, the temperature resistance grade is remarkably improved, and the heat resistance temperature of the PE can be improved from 70 ℃ to more than 100 ℃;

the molecules of polyethylene consist of linear molecular chains. When the temperature is increased, the binding force between linear molecular chains is weakened, so that the whole molecular material is deformed, and the temperature resistance of the polyethylene is poor. And crosslinked polyethylene (CLPE) has chemical chain bridges erected between molecules, so that the molecules cannot be displaced, and the defects of polyethylene are overcome.

The existing crosslinked polyethylene insulated medium-voltage cable can emit a large amount of heat in the using process, especially, the cable internally comprises a plurality of cable cores, although the conventional medium-voltage cable adopts a crosslinked polyethylene pipe to improve the temperature resistance level, one side of the plurality of cable cores inside the cable cores is tightly attached together, the heat is accumulated, the heat cannot be timely discharged, short circuit is easily caused, and the fire disaster is caused even in severe cases. For this purpose, a crosslinked polyethylene insulated medium voltage cable is proposed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an insulating medium voltage cable of crosslinked polyethylene to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a crosslinked polyethylene insulated medium voltage cable comprises a crosslinked polyethylene pipe body, wherein cable cores which are arranged in an annular mode are uniformly arranged in the crosslinked polyethylene pipe body, the outer side wall of the cable core is sleeved with an insulating sleeve, the inner side wall of the cross-linked polyethylene pipe body is fixedly connected with a heat insulating layer, the heat insulation layer comprises a graphene heat insulation block and graphene heat insulation sheets, the graphene heat insulation sheets are positioned on the inner sides of the cable cores which are annularly arranged, the number of the graphene heat insulation sheets is the same as that of the cable cores, the graphene heat insulation sheets and the cable cores are arranged at intervals, one side of the graphene heat insulation sheet is fixedly connected with the graphene heat insulation block, the other side of the graphene heat insulation sheet is fixedly connected with the inner side wall of the cross-linked polyethylene pipe body, the lateral wall of crosslinked polyethylene pipe body has cup jointed the heat conduction copper sheet, the lateral wall of heat conduction copper sheet has cup jointed the second heat-conducting layer.

As further preferable in the present technical solution: and the outer side wall of the second heat conduction layer is sleeved with an armor layer.

As further preferable in the present technical solution: the outer side wall of the armor layer is coated with a waterproof film.

As further preferable in the present technical solution: the second heat conduction layer comprises blocks, connecting rods and a hollow part, the blocks are uniformly and fixedly connected to the outer side wall of the heat conduction copper sheet, the number of the connecting rods is multiple, two adjacent blocks are fixedly connected with one connecting rod and multiple blocks are formed between the connecting rods, and the hollow part is formed between the blocks and the connecting rods.

As further preferable in the present technical solution: the lateral wall of crosslinked polyethylene pipe body has evenly seted up logical groove, the inside scarf joint that leads to the groove has insulating heat conduction pad.

As further preferable in the present technical solution: the inside of the crosslinked polyethylene pipe body is filled with a first heat conduction layer.

Compared with the prior art, the beneficial effects of the utility model are that: cut apart many cable cores through the insulating layer for the heat that many cable cores work produced can not assemble together, improves the security performance of this cable, cooperates through first heat-conducting layer, heat conduction copper sheet and second heat-conducting layer after that, gives off the inside heat of this cable to the external world fast, avoids because the heat piles up the condition that leads to short circuit, conflagration and appears.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural view of a second heat conduction layer in the present invention;

fig. 3 is a schematic structural diagram of the middle cross-linked polyethylene pipe of the present invention.

In the figure: 1. a crosslinked polyethylene pipe body; 11. a through groove; 12. an insulating heat conducting pad; 2. a cable core; 3. a thermal insulation layer; 31. a graphene thermal insulation block; 32. a graphene thermal barrier sheet; 4. an insulating sleeve; 5. a first thermally conductive layer; 6. a thermally conductive copper sheet; 7. a second thermally conductive layer; 71. a block body; 72. a connecting rod; 73. a hollow part; 8. an armor layer; 9. a water-resistant membrane.

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.

Examples

Referring to fig. 1-3, the present invention provides a technical solution: the utility model provides an insulating medium voltage cable of crosslinked polyethylene, including crosslinked polyethylene pipe body 1, the inside of crosslinked polyethylene pipe body 1 evenly is equipped with the cable core 2 that the annular was arranged, the lateral wall cover of cable core 2 is equipped with insulating cover 4, the inside wall fixedly connected with insulating layer 3 of crosslinked polyethylene pipe body 1, insulating layer 3 includes graphite alkene heat insulating block 31 and graphite alkene heat insulating sheet 32, graphite alkene heat insulating sheet 32 is located the inboard of the cable core 2 of annular arrangement, graphite alkene heat insulating sheet 32's quantity is the same with cable core 2's quantity, graphite alkene heat insulating sheet 32 separates the setting with cable core 2 interval, one side and graphite alkene heat insulating block 31 fixed connection of graphite alkene heat insulating sheet 32, graphite alkene heat insulating sheet 32's opposite side fixed connection is in the inside wall of crosslinked polyethylene pipe body 1, crosslinked polyethylene pipe body 1's lateral wall has cup jointed heat conduction copper sheet 6, heat conduction copper sheet 6's lateral wall has cup jointed second heat-conducting.

In this embodiment, specifically: the outer side wall of the second heat conduction layer 7 is sleeved with an armor layer 8; set up armor 8 through the outside at second heat-conducting layer 7, can improve the tightness of this medium voltage cable, effectively prevent that the rat insect from gnawing and stinging, prolong the life of this cable, armor 8's material is the soft tubular structure of constituteing by arbitrary one kind or multiple cooperation insulating rubber cover in steel band, steel wire, copper strips, the tinned wire.

In this embodiment, specifically: the outer side wall of the armor layer 8 is coated with a waterproof film 9; the waterproof performance of the cable can be improved by coating the waterproof film 9 on the outer side wall of the armor layer 8.

In this embodiment, specifically: the second heat conduction layer 7 comprises a plurality of block bodies 71, connecting rods 72 and hollow parts 73, the block bodies 71 are uniformly and fixedly connected to the outer side walls of the heat conduction copper sheets 6, the number of the connecting rods 72 is multiple, one connecting rod 72 is fixedly connected between every two adjacent block bodies 71, and the hollow parts 73 are formed between the plurality of block bodies 71 and the connecting rods 72; through above setting, connecting rod 72 is connected with block 71, when having guaranteed the firm performance of this cable, form well kenozooecium 73 for the inside heat of this cable can be fast through second heat-conducting layer 7, give off to the external world, improve the heat dispersion of this cable, and simultaneously, block 71 and connecting rod 72 are the soft structure that is formed by the preparation of heat conduction silicone grease, possess higher heat conductivity, high temperature resistant, ageing-resistant and waterproof characteristic, and simultaneously, well kenozooecium 73's setting still can practice thrift a large amount of materials.

In this embodiment, specifically: through grooves 11 are uniformly formed in the outer side wall of the cross-linked polyethylene pipe body 1, and insulating heat-conducting pads 12 are embedded in the through grooves 11; through setting up logical groove 11, can make the inside heat of crosslinked polyethylene pipe body 1 volatilize to crosslinked polyethylene pipe body 1 outside fast, the setting of insulating heat conduction pad 12 simultaneously when not hindering the heat conductivility, still possesses insulating effect, and insulating heat conduction pad 12 is made by silicon nitride.

In this embodiment, specifically: the inside of the cross-linked polyethylene pipe body 1 is filled with a first heat conduction layer 5; through setting up first heat-conducting layer 5, can give off the heat that 2 work of cable core produced to cross-linked polyethylene pipe body 1 department fast, the material of first heat-conducting layer 5 is heat conduction silicone grease.

According to the working principle or the structural principle, when the cable core is used, heat generated by the operation of the cable core 2 is transmitted to the crosslinked polyethylene pipe body 1 through the first heat conduction layer 5, is transmitted to the heat conduction copper sheet 6 through the through groove 11 formed in the outer side of the crosslinked polyethylene pipe body 1, is transmitted to the second heat conduction layer 7, and is emitted to the outside through the armor layer 8, so that the heat generated by the operation of the cable can be rapidly emitted to the outside, and the situations of short circuit and fire disaster caused by heat accumulation are avoided; meanwhile, the heat insulation layer 3 in the cable divides the cable cores 2, so that heat generated by the work of the cable cores 2 cannot be gathered together, and the safety performance of the cable is improved again.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A cross-linked polyethylene insulated medium voltage cable comprises a cross-linked polyethylene pipe body (1), and is characterized in that: the cable core (2) that the annular was arranged is evenly equipped with to the inside of crosslinked polyethylene pipe body (1), the lateral wall cover of cable core (2) is equipped with insulating cover (4), the inside wall fixedly connected with insulating layer (3) of crosslinked polyethylene pipe body (1), insulating layer (3) include graphite alkene heat insulating block (31) and graphite alkene heat insulating sheet (32), graphite alkene heat insulating sheet (32) are located the annular and arrange the inboard of cable core (2), the quantity of graphite alkene heat insulating sheet (32) is the same with the quantity of cable core (2), graphite alkene heat insulating sheet (32) with cable core (2) interval sets up, one side of graphite alkene heat insulating sheet (32) with graphite alkene heat insulating block (31) fixed connection, the opposite side fixed connection of graphite alkene heat insulating sheet (32) in the inside wall of crosslinked polyethylene pipe body (1), the outer side wall of the cross-linked polyethylene pipe body (1) is sleeved with a heat conduction copper sheet (6), and the outer side wall of the heat conduction copper sheet (6) is sleeved with a second heat conduction layer (7).

2. A cross-linked polyethylene insulated medium voltage cable according to claim 1, characterized in that: and an armor layer (8) is sleeved on the outer side wall of the second heat conduction layer (7).

3. A cross-linked polyethylene insulated medium voltage cable according to claim 2, characterized in that: the outer side wall of the armor layer (8) is coated with a waterproof film (9).

4. A cross-linked polyethylene insulated medium voltage cable according to claim 1, characterized in that: the second heat conduction layer (7) comprises block bodies (71), connecting rods (72) and a hollow portion (73), the block bodies (71) are uniformly and fixedly connected to the outer side wall of the heat conduction copper sheet (6), the number of the connecting rods (72) is multiple, one connecting rod (72) is fixedly connected between every two adjacent block bodies (71), and the hollow portion (73) is formed between every two adjacent block bodies (71) and the connecting rods (72).

5. A cross-linked polyethylene insulated medium voltage cable according to claim 1, characterized in that: the outer side wall of the cross-linked polyethylene pipe body (1) is uniformly provided with through grooves (11), and insulating heat-conducting pads (12) are embedded in the through grooves (11).

6. A cross-linked polyethylene insulated medium voltage cable according to claim 1, characterized in that: the inside of the crosslinked polyethylene pipe body (1) is filled with a first heat conduction layer (5).