High-temperature-resistant flame-retardant power cable

Abstract

A high-temperature-resistant flame-retardant power cable relates to the technical field of power cables and comprises a cable core, four annularly-distributed wire cores are arranged inside the cable core, the cross section of each wire core is of a fan-shaped structure, each wire core is composed of a conductor, an alloy layer and an inner insulating layer, a shielding layer is arranged outside the cable core, and the shielding layer is arranged outside the cable core. The shielding layer is composed of a metal shielding layer and a semi-conductive polymer shielding layer, a heat resistance layer is arranged outside the shielding layer and composed of a reflecting layer and a heat insulation layer, a flame-retardant layer is arranged outside the heat resistance layer and composed of a carbonization layer and a fireproof layer, and the carbonization layer and the fireproof layer are arranged on the outer side of the heat resistance layer. According to the scheme, the problem that the shielding performance of the power cable is affected due to poor heat-resistant and flame-retardant effects is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to power cable technical field, concretely is a kind of high-temperature-resistant flame-retardant power cable. BACKGROUND

[0002] Power cable is a kind of insulated wire assembly specially used for transmission and distribution of electric energy, usually composed of conductor core, insulation layer, shielding layer (if necessary) and sheath layer, with excellent electrical performance, mechanical strength and environmental aging resistance, widely used in power station, substation, industrial facilities and residential power distribution system, to ensure the safety, reliability and efficiency of power supply.

[0003] For example, the Chinese authorized patent "a kind of power cable" with announcement number CN219591177U, including first protective layer, cable core and monitoring assembly, first protective layer is arranged on the outside of cable core, and first protective layer is in its interior at least two cable cores and monitoring assembly are contained in the way of building the cable body outer protective layer with oval cross section, wherein, two cable cores are arranged in the way of their axis parallel to each other, and monitoring assembly is also contained in the gap space between two cable cores;A plurality of core wires in the same annulus are arranged in the cable core, and fiber rope is arranged in the inside of the annulus defined by the core wire, and the first limiting member is sleeved outside the fiber rope in the way of limiting the distance between the plurality of core wires defined in the same annulus;The second protective layer is sleeved outside the plurality of core wires defined in the same annulus, and the second limiting member is arranged between the second protective layer and the core wire.

[0004] The above prior art has shielding effect, but in high temperature environment, the insulation material and conductor material of cable can be softened or melted, so that the structure of cable is deformed, and then the electrical performance of cable is reduced, such as weakening of conduction performance or breaking, and then the shielding effect is affected, so it does not meet the existing demand, for this, we propose a kind of high-temperature-resistant flame-retardant power cable. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of high-temperature-resistant flame-retardant power cable to solve the problem of shielding performance influenced by poor heat resistance and flame retardation effect of power cable in the above background art.

[0006] To achieve the above object, the utility model provides the following technical scheme: a kind of high-temperature-resistant flame-retardant power cable, including cable core, the inside of the cable core is equipped with four annular distribution's wire core, and the cross section of wire core is fan-shaped structure, the wire core is composed of conductor, alloy layer and inner insulation layer, the outside of the cable core is provided with shielding layer, the shielding layer is by metal shielding layer and semiconductive high polymer shielding layer, the outside of the shielding layer is provided with heat resistance layer, the heat resistance layer is composed of reflection layer and heat insulation layer, the outside of the heat resistance layer is provided with flame-retardant layer, the flame-retardant layer is composed of carbonization layer and fireproof layer.

[0007] Preferably, the conductor is twisted into a bundle by a plurality of thin copper wires, the alloy layer is spirally wound outside the conductor, and the inner insulation layer is extruded outside the alloy layer.

[0008] Preferably, a reinforcing core is arranged at a middle position of the cable core, and the inner side of the wire core is attached to the reinforcing core.

[0009] Preferably, the metal shielding layer is wound on the outer wall of the cable core, and the semi-conductive polymer shielding layer is fixed outside the metal shielding layer by an adhesive.

[0010] Preferably, the reflective layer is wrapped outside the shielding layer, and the thermal insulation layer is fixed outside the reflective layer by an adhesive.

[0011] Preferably, the carbonization layer is formed outside the thermal barrier layer by an extrusion device, and the fireproof layer is formed outside the carbonization layer by the extrusion device.

[0012] Preferably, the outer sheath is arranged outside the fire-retardant layer, and the outer sheath is formed outside the fire-retardant layer by the extrusion device.

[0013] Compared with the prior art, the utility model has the advantages that:

[0014] 1、The double-layer composite shielding structure of the utility model combines the advantages of the metal shielding layer and the semi-conductive polymer shielding layer, can effectively suppress electromagnetic interference, ensure stable transmission of signals, the metal shielding layer reduces interference by reflecting and absorbing electromagnetic waves, and the semi-conductive polymer shielding layer can further shield residual electromagnetic interference, the design of the double-layer composite shielding structure enhances the safety performance of the cable, in extreme conditions such as fire or short circuit, the cable shielding layer can maintain a relatively long stable working time, prevents fire spreading and electromagnetic interference from causing damage to the surrounding environment and equipment.

[0015] 2、The composite thermal insulation layer adopts a multilayer composite structure, combines a high-reflectivity metal film and a vacuum thermal insulation board, can significantly reduce the heat transfer speed in the cable, improves the heat insulation effect of the cable, reduces heat loss in the transmission process of the cable due to the effective heat insulation effect of the thermal insulation layer, thereby reducing energy consumption, improving energy utilization efficiency, the thermal insulation layer can reduce safety hazards such as fire, short circuit and the like caused by overheating of the cable, and improves the safety performance of the cable.

[0016] 3、The utility model discloses a composite flame-retardant layer adopts multilayer composite structure and flame-retardant material, can improve the flame-retardant performance of cable significantly. Under the action of flame, the mutual coordination of each layer material forms multiple flame-retardant barriers, effectively prevents the spread and diffusion of flame, and because of the existence of carbonization layer, the burning speed of cable in the fire is greatly reduced, and even can self-extinguish. This greatly reduces the risk and spread speed of fire, provides valuable time for personnel evacuation and fire fighting, and the fireproof layer can isolate the damage of flame and high temperature to the internal structure of cable, protects the core wire and insulating layer of cable from being damaged. This ensures that the cable can still maintain certain power transmission capacity after the fire, and provides important communication and power support for emergency rescue. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the perspective view of the utility model;

[0018] Figure 2 It is the front view of the utility model;

[0019] Figure 3 It is the internal structure schematic view of the utility model;

[0020] Figure 4 It is the shielding layer structure schematic view of the utility model;

[0021] Figure 5 It is the heat resistance layer structure schematic view of the utility model;

[0022] Figure 6 It is the flame-retardant layer structure schematic view of the utility model.

[0023] In the drawing: 1, core wire;11, conductor;12, alloy layer;13, inner insulating layer;2, reinforcing core;3, shielding layer;31, metal shielding layer;32, semi-conductive polymer shielding layer;4, heat resistance layer;41, reflection layer;42, heat insulation layer;5, flame-retardant layer;51, carbonization layer;52, fireproof layer;6, outer sheath. DETAILED DESCRIPTION

[0024] The technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model, and apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0025] Please refer to Figures 1-6The utility model provides an embodiment: a kind of high-temperature resistant flame-retardant power cable, the inside of the cable core is equipped with four annular distribution wire core 1, and the cross section of wire core 1 is fan-shaped structure, wire core 1 is composed of conductor 11, alloy layer 12 and inner insulating layer 13, conductor 11 is twisted into bundle by multiple thin copper wires, alloy layer 12 is spirally wound outside conductor 11, inner insulating layer 13 is extruded in the outside of alloy layer 12, the middle position of cable core is equipped with reinforcing core 2, and the inside of wire core 1 is attached with reinforcing core 2;

[0026] Conductor 11 adopts high-purity copper, to ensure good electrical conductivity and mechanical strength;Alloy layer 12 is nickel-chromium alloy, which ensures good electrical conductivity and improves the high-temperature resistance and flame retardance of the wire core;The inner insulating layer 13 is polyimide, which isolates the heat transfer and electrical interference between layers, enhances the stability and safety of the wire core, and prevents damage to the entire wire core due to local overheating or electrical failure.

[0027] Please refer to Figure 1 、 Figure 3 and Figure 4 , the outside of cable core is provided with shielding layer 3, shielding layer 3 is composed of metal shielding layer 31 and semi-conductive high polymer shielding layer 32, metal shielding layer 31 is wound on the outer wall of cable core, and semi-conductive high polymer shielding layer 32 is fixed outside metal shielding layer 31 by adhesive;

[0028] Metal shielding layer 31 adopts aluminum magnesium gold wire, which can provide excellent electromagnetic shielding effect and reduce external electromagnetic interference. Semi-conductive high polymer shielding layer 32 is made of semi-conductive high polymer material, such as polyimide, which has excellent insulation performance, high temperature resistance and wear resistance, and can shield electromagnetic interference to protect the signal transmission inside the cable.

[0029] Please refer to Figure 1 、 Figure 3 and Figure 5 , the outside of shielding layer 3 is provided with heat-resistant layer 4, heat-resistant layer 4 is composed of reflective layer 41 and heat insulation layer 42, reflective layer 41 is wrapped outside shielding layer 3, and heat insulation layer 42 is fixed outside reflective layer 41 by adhesive;

[0030] Reflective layer 41 is silver-plated film, which is closely attached to the shielding layer and mainly plays the role of reflecting heat radiation, which can reduce the transfer of heat to the inside of the cable;Heat insulation layer 42 is a vacuum insulation board composed of core material and vacuum protective surface layer, the core material is porous material or fibrous material, which reduces air convection by vacuumizing, thereby achieving excellent heat insulation effect.

[0031] Please refer to Figure 1 、 Figure 3 and Figure 6The outer part of the heat resistance layer 4 is provided with a fire resistance layer 5, which is composed of a carbonization layer 51 and a fireproof layer 52, the carbonization layer 51 is formed on the outer part of the heat resistance layer 4 by extrusion equipment, and the fireproof layer 52 is formed on the outer part of the carbonization layer 51 by extrusion equipment; the carbonization layer 51 is made of fire resistance polyethylene, which can form a carbonization layer rapidly under the action of flame, isolate oxygen, and thus prevent the further spread of flame; the fireproof layer 52 is made of fire resistance ceramicized silicone rubber, which has excellent high temperature resistance and fire resistance. Under the action of flame, it can form a hard ceramicized protective layer rapidly, effectively isolate heat and oxygen, and prevent flame penetration.

[0032] Please refer to Figure 1 The outer part of the fire resistance layer 5 is provided with an outer sheath 6, which is formed on the outer part of the fire resistance layer 5 by extrusion equipment, and the outer sheath 6 is made of cross-linked polyethylene material, which can be used for a long time in high temperature environment and has better heat resistance than ordinary polyethylene cable, thereby improving the reliability and service life of the cable.

[0033] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims.

Claims

1. A high temperature resistant, flame retardant power cable comprising a core, characterized in that: The inside of the cable core is provided with four annularly distributed wire cores (1), and the cross section of the wire core (1) is a sector structure, the wire core (1) is composed of a conductor (11), an alloy layer (12) and an inner insulation layer (13), the outside of the cable core is provided with a shielding layer (3), the shielding layer (3) is composed of a metal shielding layer (31) and a semi-conductive polymer shielding layer (32), the outside of the shielding layer (3) is provided with a heat-resistant layer (4), the heat-resistant layer (4) is composed of a reflecting layer (41) and a heat insulation layer (42), the outside of the heat-resistant layer (4) is provided with a flame-retardant layer (5), the flame-retardant layer (5) is composed of a carbonization layer (51) and a fireproof layer (52).

2. A high temperature resistant, flame retardant power cable according to claim 1, characterized in that: The conductor (11) is twisted into a bundle by a plurality of fine copper wires, the alloy layer (12) is spirally wound outside the conductor (11), and the inner insulation layer (13) is extruded outside the alloy layer (12).

3. A high temperature resistant, flame retardant power cable according to claim 1, characterized in that: The middle position of the cable core is provided with a reinforcing core (2), and the inner side of the wire core (1) is attached to the reinforcing core (2).

4. A high temperature resistant, flame retardant power cable according to claim 1, characterized in that: The metal shielding layer (31) is wound on the outer wall of the cable core, and the semi-conductive polymer shielding layer (32) is fixed outside the metal shielding layer (31) by an adhesive.

5. A high temperature resistant, flame retardant power cable according to claim 1, characterized in that: The reflecting layer (41) is wrapped outside the shielding layer (3), and the heat insulation layer (42) is fixed outside the reflecting layer (41) by an adhesive.

6. A high temperature resistant, flame retardant power cable according to claim 1, characterized in that: The carbonization layer (51) is formed outside the heat-resistant layer (4) by an extrusion device, and the fireproof layer (52) is formed outside the carbonization layer (51) by an extrusion device.

7. A high temperature resistant, flame retardant power cable according to claim 1, characterized in that: The outside of the flame-retardant layer (5) is provided with an outer sheath (6), and the outer sheath (6) is formed outside the flame-retardant layer (5) by an extrusion device.

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