Insulating flame-retardant power cable

Abstract

The invention provides an insulating flame-retardant power cable, and relates to the field of power cables. The insulating flame-retardant power cable comprises a conductor, an insulating protection layer is arranged on the outer wall of the conductor, the insulating protection layer comprises a rubber layer and a shielding layer which are sequentially arranged on the outer wall of the conductor in a sleeving mode, an insulating flame-retardant layer is arranged on the outer wall of the insulating protection layer, and the insulating flame-retardant layer comprises a high-temperature-resistant layer. A plurality of cavities are formed in the high-temperature-resistant layer, and flame-retardant dust is arranged in the cavities. According to the power cable, flame spreading can be effectively prevented through the multi-layer flame-retardant design of the power cable, so that the fire risk is reduced, the safety when the power cable is used in a high-temperature and inflammable environment is improved, higher electrical insulation performance is provided through combination of multiple layers of insulating materials, electrical faults such as electric leakage and short circuit can be effectively prevented, and the service life of the power cable is prolonged. Therefore, the safety of equipment and personnel is guaranteed, and the use safety of the power cable is improved.

Description

Technical Field

[0001] The invention relates to the field of power cables, in particular to an insulated flame-retardant power cable. Background Art

[0002] Power cable is a cable used to transmit electricity. It is usually composed of multiple wires (conductors) and insulating materials to protect the conductors and reduce energy loss. Power cable is mainly used to transmit electrical energy. Power cable is an indispensable part of modern power systems, providing a reliable and safe way of power transmission. It is widely used in daily life and industrial production.

[0003] However, most traditional power cables have the problem of a single flame-retardant insulation structure. The single flame-retardant insulation structure may result in the cable being unable to effectively prevent the spread of flames when a fire occurs, increasing the risk of fire spread and possibly posing a threat to the surrounding environment and personnel, thereby reducing the safety of the power cable in use.

[0004] Therefore, those skilled in the art provide an insulated flame-retardant power cable to solve the problems raised in the above background technology. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies of the prior art, the present invention provides an insulated flame-retardant power cable, which solves the problem of a single insulating flame-retardant structure.

[0007] (II) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] An insulated flame-retardant power cable, comprising a conductor, the outer wall of the conductor is provided with an insulating protective layer, the insulating protective layer comprises a rubber layer and a shielding layer which are sequentially sleeved on the outer wall of the conductor, the outer wall of the insulating protective layer is provided with an insulating flame-retardant layer, the insulating flame-retardant layer comprises a high temperature resistant layer, a plurality of chambers are opened inside the high temperature resistant layer, and flame retardant dust is arranged inside the chamber;

[0010] The outer wall of the insulating flame retardant layer is provided with a protective steel coil, and the outer wall of the protective steel coil is provided with a flame retardant protective layer, and the flame retardant protective layer includes a waterproof layer and a polyvinyl chloride layer which are sequentially sleeved on the outer wall of the protective steel coil.

[0011] Through the above technical scheme, compared with the traditional power cable, the power cable is respectively provided with an insulating flame retardant layer and a flame retardant protective layer, which are then used in conjunction with the insulating protective layer provided in the power cable itself to form a multi-layer insulating flame retardant layer. The combination of polytetrafluoroethylene of the insulating flame retardant layer and polyvinyl chloride of the flame retardant protective layer provides excellent flame retardant properties, which can effectively inhibit the spread of flames and reduce the risk of fire. When encountering fire, the multi-layer structure can delay the spread of flames, protect the core conductor of the cable and the surrounding environment, and cooperate with the rubber layer provided in the insulating flame retardant layer to form a higher electrical insulation performance, so that the cable can maintain good insulation even in high temperature and humid environments. The multi-layer structure provides multiple protections to ensure the safe and reliable operation of the cable and reduce the spread of fire when it occurs.

[0012] Furthermore, the rubber layer is closely attached to the outer wall of the conductor, and the shielding layer is closely attached to the outer wall of the rubber layer;

[0013] Through the above technical solution, the insulating protective layer can be arranged more tightly in the innermost layer of the power cable.

[0014] Furthermore, the high temperature resistant layer is closely attached to the outer wall of the shielding layer, and the protective steel coil is closely attached to the outer wall of the high temperature resistant layer;

[0015] Through the above technical solution, the insulating flame-retardant layer can be arranged more closely in the middle layer of the power cable.

[0016] Furthermore, the waterproof layer is closely attached to the outer wall of the protective steel coil, and the polyvinyl chloride layer is closely attached to the outer wall of the waterproof layer;

[0017] Through the above technical solution, the flame retardant protective layer can be arranged more closely on the outermost layer of the power cable.

[0018] Further, the flame retardant dust is in close contact with the inner wall of the chamber;

[0019] Through the above technical solution, the flame retardant dust can react with the flame more quickly and timely when the chamber is broken.

[0020] Furthermore, the material of the rubber layer is natural rubber, and the material of the shielding layer is metal aluminum foil;

[0021] Through the above technical solution, natural rubber has good insulation properties and can initially isolate the current flowing through the conductor when it is in use, while the metal aluminum foil can reduce electromagnetic interference and enhance the cable's anti-interference ability.

[0022] Furthermore, the material of the high temperature resistant layer is polytetrafluoroethylene, and the material of the flame retardant dust is aluminum hydroxide;

[0023] Through the above technical solution, polytetrafluoroethylene has higher electrical insulation and heat resistance. It can not only effectively prevent current leakage in a high voltage environment, but also withstand higher temperatures. Aluminum hydroxide will release water under the high temperature of the flame, thereby more effectively suppressing the burning of the flame.

[0024] Furthermore, the material of the waterproof layer is cross-linked polyethylene, and the material of the polyvinyl chloride layer is polyvinyl chloride;

[0025] Through the above technical scheme, cross-linked polyethylene, a thermoplastic material, has excellent insulation properties and water resistance, and polyvinyl chloride not only has a good flame retardant effect but can also be used in combination with cross-linked polyethylene to form a good waterproof effect.

[0026] (III) Beneficial effects

[0027] The present invention provides an insulated flame-retardant power cable. It has the following beneficial effects:

[0028] 1. The present invention provides an insulated flame-retardant power cable. Compared with the traditional power cable, the power cable is respectively provided with an insulating flame-retardant layer and a flame-retardant protective layer, which are then used in conjunction with the insulating protective layer provided on the power cable itself to form a multi-layer insulating flame-retardant layer. The combination of polytetrafluoroethylene of the insulating flame-retardant layer and polyvinyl chloride of the flame-retardant protective layer provides excellent flame-retardant properties, which can effectively inhibit the spread of flames and reduce the risk of fire. When encountering fire, the multi-layer structure can delay the spread of flames, protect the core conductor of the cable and the surrounding environment, and cooperate with the rubber layer provided in the insulating flame-retardant layer to form a higher electrical insulation performance, so that the cable can maintain a good insulation effect even in a high temperature and humid environment. The multi-layer structure provides multiple protections, ensures the safe and reliable operation of the cable, and reduces the spread of fire when it occurs.

[0029] 2. The present invention provides an insulated flame-retardant power cable, in which a chamber opened inside the insulating flame-retardant layer of the power cable is provided with flame-retardant dust, and the flame-retardant dust is composed of aluminum hydroxide, so that after the flame breaks through the flame-retardant protective layer and melts the high-temperature resistant layer, the flame-retardant dust can release moisture under the high temperature of the flame, thereby more effectively suppressing the burning of the flame. The multiple layers of non-connected flame-retardant dust can not only enhance the flame-retardant effect, but also reduce the waste of resources. The high-temperature resistant layer of the insulating flame-retardant layer made of polytetrafluoroethylene has relatively excellent heat resistance and chemical stability, and a high melting point, and can effectively block the influence of external high temperature on aluminum hydroxide, thereby reducing the possibility of the flame-retardant dust reacting at normal temperature, thereby further enhancing the flame-retardant effect of the power cable.

[0030] 3. The present invention provides an insulated flame-retardant power cable. The multi-layer flame-retardant design of the power cable can effectively prevent the spread of flames, thereby reducing the risk of fire and further improving the safety when used in high temperature and flammable environments. The combination of multiple layers of insulating materials provides higher electrical insulation performance, which can effectively prevent electrical faults such as leakage and short circuit, thereby ensuring the safety of equipment and personnel, and improving the safety of the power cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the present invention;

[0032] Figure 2 It is an axonometric schematic diagram of the present invention;

[0033] Figure 3 It is a schematic diagram of the protective steel coil structure of the present invention;

[0034] Figure 4 It is a schematic diagram of the structure of the insulating flame retardant layer of the present invention;

[0035] Figure 5 is a side sectional view of the present invention;

[0036] Figure 6 It is a front cross-sectional view of the present invention.

[0037] Among them, 1. conductor; 2. insulating protective layer; 201. rubber layer; 202. shielding layer; 3. insulating flame retardant layer; 301. high temperature resistant layer; 302. chamber; 303. flame retardant dust; 4. protective steel coil; 5. flame retardant protective layer; 501. waterproof layer; 502. polyvinyl chloride layer. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] like Figure 1-Figure 6As shown, an embodiment of the present invention provides an insulated flame-retardant power cable, comprising a conductor 1, an insulating protective layer 2 is provided on the outer wall of the conductor 1, the insulating protective layer 2 comprises a rubber layer 201 and a shielding layer 202 which are sequentially sleeved on the outer wall of the conductor 1, an insulating flame-retardant layer 3 is provided on the outer wall of the insulating protective layer 2, the insulating flame-retardant layer 3 comprises a high temperature resistant layer 301, a plurality of chambers 302 are provided inside the high temperature resistant layer 301, and flame-retardant dust 303 is provided inside the chamber 302, the rubber layer 201 is closely attached to the outer wall of the conductor 1, the shielding layer 202 is closely attached to the outer wall of the rubber layer 201, so that the insulating protective layer 2 can be relatively closely arranged in the innermost layer of the power cable, the high temperature resistant layer 301 is closely attached to the outer wall of the shielding layer 202, and the protective steel coil 4 is closely attached to the outer wall of the high temperature resistant layer 301, so that the insulating flame-retardant layer 3 can be relatively closely arranged in the middle layer of the power cable;

[0040] The outer wall of the insulating flame retardant layer 3 is provided with a plurality of protective steel coils 4, and the outer wall of the protective steel coil 4 is provided with a flame retardant protective layer 5, the flame retardant protective layer 5 comprises a waterproof layer 501 and a polyvinyl chloride layer 502 which are sequentially sleeved on the outer wall of the protective steel coil 4, and the chamber 302 opened inside the insulating flame retardant layer 3 provided in the power cable is provided with a flame retardant dust 303, and the flame retardant dust 303 is composed of aluminum hydroxide, so that after the flame breaks through the flame retardant protective layer 5 and melts the high temperature resistant layer 301, the flame retardant dust 303 can release moisture under the high temperature of the flame (aluminum hydroxide will decompose when baked at high temperature to generate aluminum oxide and water vapor, and this process usually occurs at about 200°C to 10 Within the temperature range of 00℃, when aluminum hydroxide is heated, it will release moisture bound in the crystal structure. Therefore, when baked at high temperature, aluminum hydroxide will produce moisture), thereby effectively suppressing the burning of the flame. The multiple layers of non-connected flame retardant dust 303 can not only enhance the flame retardant effect, but also reduce the waste of resources. The insulating flame retardant layer 3, the high temperature resistant layer 301 of polytetrafluoroethylene material has excellent heat resistance and chemical stability, and a high melting point, which can effectively block the influence of external high temperature on aluminum hydroxide, thereby reducing the possibility of the flame retardant dust 303 reacting at normal temperature, thereby further enhancing the flame retardant effect of the power cable.

[0041] The waterproof layer 501 is closely attached to the outer wall of the protective steel coil 4, and the polyvinyl chloride layer 502 is closely attached to the outer wall of the waterproof layer 501, so that the flame retardant protective layer 5 can be relatively closely arranged on the outermost layer of the power cable, and the flame retardant dust 303 is closely attached to the inner wall of the chamber 302, so that when the chamber 302 is broken, the flame retardant dust 303 can react with the flame relatively quickly and timely. The material of the rubber layer 201 is natural rubber, and the material of the shielding layer 202 is metal aluminum foil. Natural rubber has good insulation and can preliminarily isolate the current flowing through the conductor 1 when it is in use. The metal aluminum foil can reduce electromagnetic interference and improve the cable's anti-drying performance. The material of the high temperature resistant layer 301 is polytetrafluoroethylene, and the material of the flame retardant dust 303 is aluminum hydroxide. Polytetrafluoroethylene has high electrical insulation and heat resistance. It can not only effectively prevent current leakage under high voltage environment, but also withstand high temperature. Aluminum hydroxide will release moisture under high temperature of flame, thereby more effectively suppressing the burning of flame. The material of the waterproof layer 501 is cross-linked polyethylene, and the material of the polyvinyl chloride layer 502 is polyvinyl chloride. Cross-linked polyethylene is a thermoplastic material with excellent insulation and water resistance. Polyvinyl chloride not only has good flame retardant effect but also can be used in conjunction with cross-linked polyethylene to form a good waterproof effect.

[0042] Working principle: When the flame burns in the power cable due to an accident, the polyvinyl chloride layer 502 arranged in the flame retardant protective layer 5 will provide the first layer of flame retardancy for the flame, reducing the possibility of the flame spreading and burning. When the polyvinyl chloride layer 502 is damaged or broken through by the flame, the flame will heat up the high temperature resistant layer 301 arranged in the insulating flame retardant layer 3 to cause melting. The increase in the temperature of the high temperature resistant layer 301 causes the flame retardant dust 303 made of aluminum hydroxide to react. When the chamber 302 is broken, the flame retardant dust 303 releases moisture under the high temperature of the flame, thereby more effectively suppressing the burning of the flame and forming a fireproof layer on the surface of the power cable. When the flame retardant dust 303 in one layer of the chamber 302 cannot be blocked, other chambers 302 will be broken according to the burning of the flame, thereby continuously weakening the burning of the flame and finally extinguishing it.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An insulated flame-retardant power cable, comprising a conductor (1), characterized in that: The outer wall of the conductor (1) is provided with an insulating protective layer (2), the insulating protective layer (2) comprising a rubber layer (201) and a shielding layer (202) which are sequentially sleeved on the outer wall of the conductor (1), the outer wall of the insulating protective layer (2) is provided with an insulating flame retardant layer (3), the insulating flame retardant layer (3) comprises a high temperature resistant layer (301), a plurality of chambers (302) are provided inside the high temperature resistant layer (301), and flame retardant dust (303) is provided inside the chamber (302); The outer wall of the insulating flame retardant layer (3) is provided with a protective steel coil (4), and the outer wall of the protective steel coil (4) is provided with a flame retardant protective layer (5), and the flame retardant protective layer (5) comprises a waterproof layer (501) and a polyvinyl chloride layer (502) which are sequentially sleeved on the outer wall of the protective steel coil (4).

2. The insulated flame-retardant power cable according to claim 1, characterized in that: The rubber layer (201) is closely attached to the outer wall of the conductor (1), and the shielding layer (202) is closely attached to the outer wall of the rubber layer (201).

3. The insulated flame-retardant power cable according to claim 1, characterized in that: The high temperature resistant layer (301) is tightly fitted to the outer wall of the shielding layer (202), and the protective steel coil (4) is tightly fitted to the outer wall of the high temperature resistant layer (301).

4. The insulated flame-retardant power cable according to claim 1, characterized in that: The waterproof layer (501) is closely attached to the outer wall of the protective steel coil (4), and the polyvinyl chloride layer (502) is closely attached to the outer wall of the waterproof layer (501).

5. The insulated flame-retardant power cable according to claim 1, characterized in that: The flame retardant dust (303) is in close contact with the inner wall of the chamber (302).

6. The insulated flame-retardant power cable according to claim 1, characterized in that: The material of the rubber layer (201) is natural rubber, and the material of the shielding layer (202) is metal aluminum foil.

7. The insulated flame-retardant power cable according to claim 1, characterized in that: The material of the high temperature resistant layer (301) is polytetrafluoroethylene, and the material of the flame retardant dust (303) is aluminum hydroxide.

8. The insulated flame-retardant power cable according to claim 1, characterized in that: The material of the waterproof layer (501) is cross-linked polyethylene, and the material of the polyvinyl chloride layer (502) is polyvinyl chloride.

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