Mineral insulated power cable

Abstract

The utility model relates to a mineral insulated power cable, which comprises a plurality of conductors, a graphene coating and an inner insulating layer are arranged outside each conductor, an outer insulating layer, a metal braided shielding layer, a tensile filling layer, a metal armor layer and an outer sheath are sequentially arranged outside the plurality of conductors, and mineral insulated fillers are arranged between the plurality of conductors and the outer insulating layer. According to the utility model, the outer wall of the conductor is coated with the graphene coating, so that a conductive layer can be formed, electromagnetic interference can be shielded, and the current-carrying capacity and high-voltage impact resistance of the conductor are improved; the inner insulating layer, the mineral insulating filler and the outer insulating layer form three-level insulating protection, so that electric leakage is further prevented; the air pore structure of the graphene foam layer is beneficial to improving the heat dissipation capability of the cable and preventing the current transmission performance of the cable from being reduced due to heat accumulation; the metal armor layer not only can improve the anti-puncture / anti-scratch performance of the cable, but also can increase the overall strength, so that a good protection effect is achieved; the tensile filling layer improves the tensile performance of the cable.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric wire and cable, especially to a mineral insulated power cable. BACKGROUND

[0002] Power cable is a cable for transmitting and distributing electric energy, and is often used in urban underground power grid, power station outgoing line, internal power supply of industrial and mining enterprises and underwater power transmission line across rivers and seas.

[0003] In order to prevent the conductive body from contacting the outside world and causing accidents such as electric leakage, short circuit and electric shock, an insulating layer needs to be provided, and the existing cable insulating layer is mostly single-layer, which is affected by the outside or ages after a long time, affecting the insulating effect, and the tensile protection performance of the cable also needs to be further improved. UTILITY MODEL CONTENTS

[0004] The utility model aims at solving the insufficient prior art and provides a mineral insulated power cable.

[0005] In order to achieve the above-mentioned purpose, the following technical solutions are adopted:

[0006] A mineral insulated power cable comprises a plurality of conductors, each of which is provided with a graphene coating and an inner insulating layer outside, and is sequentially provided with an outer insulating layer, a metal braided shielding layer, a tensile filling layer, a metal armor layer and an outer sheath outside the plurality of conductors, and is provided with a mineral insulating filler between the plurality of conductors and the outer insulating layer.

[0007] A graphene foam layer is arranged between the outer insulating layer and the metal braided shielding layer.

[0008] A flame-retardant foaming layer is arranged between the metal armor layer and the outer sheath.

[0009] The tensile filling layer is filled with a plurality of tensile fiber ropes in the inner circumference.

[0010] The tensile fiber rope is in a wave shape structure in the length direction.

[0011] The metal armor layer is formed by spiral winding of steel belts.

[0012] The outer sheath is provided with a wear-resistant coating.

[0013] The utility model discloses a beneficial effect is: the utility model graphene coating is coated in the conductor outer wall, can form the conductive layer, also can shield electromagnetic interference, has improved the current -carrying capacity and the anti -high pressure impact resistance of conductor, the inner insulating layer, mineral insulating filler, outer insulating layer forms the insulation protection of three levels, prevents the electric leakage further, the structure of graphene foam layer air gap is favorable to improve the cable heat dissipation capacity, prevents the heat accumulation and leads to the current transmission performance of cable to drop, metal armor layer not only can improve the anti -puncture / scratch performance of cable, can also increase the strength of whole, plays good protection effect, the tensile filling layer improves the tensile performance of cable. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 It is the structure schematic diagram of the utility model;

[0015] Fig. 2 It is the structure schematic diagram of the tensile fiber rope;

[0016] In the drawing: 1 - conductor, 2 - graphene coating, 3 - inner insulating layer, 4 - outer insulating layer, 5 - metal braided shielding layer, 6 - tensile filling layer, 7 - metal armor layer, 8 - outer sheath, 9 - mineral insulating filler, 10 - graphene foam layer, 11 - flame -retardant foaming layer, 12 - tensile fiber rope;

[0017] The utility model will be described in detail below in conjunction with the embodiment thereof with reference to the drawings. DETAILED DESCRIPTION

[0018] The principles and features of the utility model will be described below in conjunction with the drawings, and the examples are only used to explain the utility model and are not used to limit the scope of the utility model. In the following paragraphs, the utility model is described in more detail with examples with reference to the drawings. According to the following description, the advantages and features of the utility model will be more clear. It should be noted that the drawings are very simplified and use non-precise proportions, only to facilitate, clear and assist in explaining the purpose of the utility model embodiments.

[0019] It should be noted that when the component is referred to as "fixed to" another component, it can be directly on another component or there can be a middle component. When a component is considered "connected" to another component, it can be directly connected to another component or there can be a middle component. When a component is considered "disposed on" another component, it can be directly disposed on another component or there can be a middle component. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. The use herein of the terms "including", "comprising", "having" and the like are specifically intended to be construed in an inclusive sense and not to the exclusion of any other items.

[0021] The application will be further described below with reference to the drawings and embodiments:

[0022] As shown in the figure, a mineral insulated power cable comprises a plurality of conductors 1, each conductor 1 is provided with a graphene coating 2 and an inner insulation layer 3 outside, and is sequentially provided with an outer insulation layer 4, a graphene foam layer 10, a metal braided shielding layer 5, a tensile filling layer 6, a metal armor layer 7, a flame-retardant foaming layer 11 and an outer sheath 8 outside the plurality of conductors 1, and is provided with a mineral insulation filler 9 between the plurality of conductors 1 and the outer insulation layer 4. Figs. 1-2 The tensile filling layer 6 is filled with a plurality of tensile fiber ropes 12 in the inner circumference, and the tensile fiber ropes 12 are in a wave-shaped structure in the length direction, and have a certain deformation amount when the cable is bent or stretched, thereby improving the tensile performance of the cable.

[0023] The graphene coating 2 is coated on the outer wall of the conductor 1, can form a conductive layer, can also shield electromagnetic interference, improves the current-carrying capacity and high-pressure impact resistance of the conductor, and further prevents electric leakage in combination with the outer inner insulation layer 3 to form protection.

[0024] The graphene foam layer 10 is arranged between the outer insulation layer 4 and the metal braided shielding layer 5. The structure of the air pore of the graphene foam layer 10 is beneficial to improve the heat dissipation capacity of the cable, facilitates the conduction of internal heat to the external structure, prevents heat accumulation from causing the current transmission performance of the cable to decrease, and affects the service life of the cable.

[0025] The flame-retardant foaming layer 11 is arranged between the metal armor layer 8 and the outer sheath 9. The flame-retardant foaming layer 11 is coated by a water-based fireproof paint that generates a dense foam heat insulation layer when on fire, thereby enhancing the fireproof and flame-retardant performance of the cable.

[0026] The metal armor layer 7 is spirally wound by a steel belt, which not only improves the anti-puncture / wound performance of the cable, but also increases the overall strength, thereby achieving a good protection effect.

[0027] The outer sheath 8 is provided with a wear-resistant coating, which can effectively improve the wear resistance of the cable and prolong the service life of the cable.

[0028] The mineral insulation filler 9 is made of a mixture of talcum powder and quartz sand.

[0029]

[0030] ​The utility model has been described exemplarily above in combination with the drawings, and obviously, the utility model is not limited by the above-mentioned mode in the specific implementation, and various improvements adopting the method concept and technical scheme of the utility model or direct application in other occasions without improvement are all within the protection scope of the utility model.

Claims

1. A mineral-insulated power cable, characterized in that, The application relates to a cable, which comprises a plurality of conductors (1), each of which is provided with a graphene coating (2) on the outside and an inner insulation layer (3), and is sequentially provided with an outer insulation layer (4), a metal braided shielding layer (5), a tensile filling layer (6), a metal armor layer (7) and an outer sheath (8) on the outside, and is provided with a mineral insulation filler (9) between the plurality of conductors (1) and the outer insulation layer (4).

2. A mineral-insulated power cable according to claim 1, characterized in that A graphene foam layer (10) is arranged between the outer insulation layer (4) and the metal braided shielding layer (5).

3. A mineral-insulated power cable according to claim 2, characterised in that A flame-retardant foaming layer (11) is arranged between the metal armor layer (7) and the outer sheath (8).

4. A mineral-insulated power cable according to claim 3, characterised in that The tensile filling layer (6) is filled with a plurality of tensile fiber ropes (12) on the inner circumference.

5. A mineral-insulated power cable according to claim 4, characterised in that The tensile fiber rope (12) is in a wavy structure in the length direction.

6. A mineral-insulated power cable according to claim 5, characterised in that The metal armor layer (7) is formed by spirally winding a steel belt.

7. A mineral-insulated power cable according to claim 6, characterised in that The outer sheath (8) is provided with a wear-resistant coating.

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