Fireproof and flame-retardant power cable

Abstract

The utility model discloses a fireproof and flame-retardant power cable, which comprises a stranded wire core, and an insulating layer, a metal shielding layer, a fireproof layer, an armor layer, a fire insulation and heat insulation layer and an outer sheath layer are sequentially arranged on the outer side of the stranded wire core. The stranded wire core comprises a steel wire rope located in the center, and insulating core wires and asbestos filling ropes which are stranded on the periphery of the steel wire rope, the insulating core wires and the asbestos filling ropes are alternately arranged, and non-woven fabric is wrapped on the periphery of the stranded wire core. The fireproof and flame-retardant power cable has the advantages of heat insulation, high temperature resistance, high fire resistance and high durability.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables, in particular to a fire-proof and flame-retardant power cable. Background Art

[0002] Power cables are used to transmit and distribute electric energy. They are commonly used in urban underground power grids, power station lead-out lines, internal power supply for industrial and mining enterprises, and underwater transmission lines across rivers and seas. Power cables are cable products used to transmit and distribute high-power electric energy in the trunk lines of power systems, including 1-500KV and above various voltage levels and various insulation power cables.

[0003] The fire retardancy of power cables during use is an important performance, which is to minimize the impact of the external environment, reduce the probability of fire, and ensure the normal use of the cable core. At present, the fire retardancy of power cables is poor, and people have higher and higher requirements for the fire retardancy of power cables, so the current power cables cannot meet the use requirements. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by this patent application is how to provide a fire-retardant power cable that is heat-insulating, high-temperature-resistant, highly flame-resistant and durable.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A fireproof and flame-retardant power cable comprises a twisted wire core, wherein an insulating layer, a metal shielding layer, a fireproof layer, an armor layer, a fireproof and heat-insulating layer and an outer sheath layer are sequentially arranged on the outer side of the twisted wire core;

[0007] The twisted wire core comprises a steel wire rope at the center and an insulating wire core and an asbestos filling rope twisted on the outer periphery of the steel wire rope. The insulating wire core and the asbestos filling rope are arranged alternately, and the outer periphery of the twisted wire core is wrapped with non-woven fabric.

[0008] In this way, first of all, for the structure of the twisted core, it is provided with a steel wire rope, which can improve the overall strength of the power cable and provide stable support for the twisted core. The twisted core includes an insulating core and an asbestos filling rope. The asbestos filling rope is filled between adjacent insulating cores, which can better insulate the adjacent insulating cores. At the same time, it is resistant to high temperature, corrosion, sulfide, smokeless, halogen-free and non-toxic, and can insulate the adjacent insulating cores. Wrapping non-woven fabric on the outside, combined with asbestos filling rope, can make the twisted core more rounded. The non-woven fabric is breathable, which is also convenient for the heat dissipation of the insulating core, reducing the heat accumulated inside, and improving the tensile strength of the twisted core. On the outside of the twisted core, an insulating layer, a metal shielding layer, a fireproof layer, an armor layer, a fireproof and heat-insulating layer and an outer sheath layer are arranged in sequence. Through the fireproof layer, the armor layer and the fireproof and heat-insulating layer, a firewall is formed, which has fireproof and flame-retardant and protective properties. The setting of the outer sheath can make the power cable more wear-resistant and durable, and extend its service life.

[0009] Wherein, the insulating layer is made of cross-linked polyethylene material.

[0010] Wherein, the outer side of the insulating layer is concave to form a plurality of notches.

[0011] Wherein, a polypropylene filling rope is arranged between the insulating layer and the metal shielding layer, and the polypropylene filling rope is arranged opposite to the notch and abuts against the notch.

[0012] Wherein, the fireproof layer is composed of ceramic mica tapes wrapped overlappingly on the outer side of the insulation layer.

[0013] Wherein, the armor layer is a steel belt armor layer.

[0014] Wherein, the fire and heat insulation layer is a halogen-free low-smoke glass fiber tape overlapped and wrapped on the outside of the armor layer.

[0015] Wherein, the outer sheath is made of low-temperature halogen-free flame-retardant polyolefin material.

[0016] Wherein, the metal shielding layer is an aluminum foil metal layer.

[0017] In summary, the fire-retardant power cable has the advantages of heat insulation, high temperature resistance, strong fire resistance and high durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model is a schematic structural diagram of a fire-resistant and flame-retardant power cable. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings. In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "upper, lower" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0020] like Figure 1 As shown, a fireproof and flame-retardant power cable comprises a twisted core, and an insulating layer 1, a metal shielding layer 2, a fireproof layer 3, an armor layer 4, a fireproof and heat-insulating layer 5 and an outer sheath layer 6 are sequentially arranged on the outer side of the twisted core;

[0021] The twisted wire core includes a steel wire rope 11 located in the center, and an insulating wire core 12 and an asbestos filling rope 13 twisted around the outer periphery of the steel wire rope. The insulating wire core and the asbestos filling rope are arranged alternately, and the outer periphery of the twisted wire core is wrapped with a non-woven fabric 14.

[0022] In this way, first of all, for the structure of the twisted core, it is provided with a steel wire rope, which can improve the overall strength of the power cable and provide stable support for the twisted core. The twisted core includes an insulating core and an asbestos filling rope. The asbestos filling rope is filled between adjacent insulating cores, which can better insulate the adjacent insulating cores. At the same time, it is resistant to high temperature, corrosion, sulfide, smokeless, halogen-free and non-toxic, and can insulate the adjacent insulating cores. Wrapping non-woven fabric on the outside, combined with asbestos filling rope, can make the twisted core more rounded. The non-woven fabric is breathable, which is also convenient for the heat dissipation of the insulating core, reducing the heat accumulated inside, and improving the tensile strength of the twisted core. On the outside of the twisted core, an insulating layer, a metal shielding layer, a fireproof layer, an armor layer, a fireproof and heat-insulating layer and an outer sheath layer are arranged in sequence. Through the fireproof layer, the armor layer and the fireproof and heat-insulating layer, a firewall is formed, which has fireproof and flame-retardant and protective properties. The setting of the outer sheath can make the power cable more wear-resistant and durable, and extend its service life.

[0023] Specifically, the insulating layer is made of cross-linked polyethylene material, which has the function of preventing fire from spreading in the cable circuit, can avoid the expansion of fire accidents to reduce losses, and has excellent flame retardancy, corrosion resistance and low smoke density.

[0024] Specifically, the outer side of the insulating layer is concave to form a plurality of notches. When the heat generated by the twisted wire core is transferred to the insulating layer, the insulating layer can be deformed. The notches are provided to facilitate outward deformation and increase the heat dissipation area.

[0025] Specifically, a polypropylene filling rope 14 is arranged between the insulating layer and the metal shielding layer, and the polypropylene filling rope is arranged opposite to the notch and abuts against the notch. The polypropylene filling rope has high flame retardant performance and can play a flame retardant effect.

[0026] Specifically, the fireproof layer is composed of ceramic mica tapes wrapped around the outer side of the insulation layer. The overall structure is compact, and the ceramic mica tapes have good electrical insulation performance, fire and heat insulation performance, and flame retardant performance.

[0027] Specifically, the armor layer is a steel belt armor layer, which improves strength, better protects the structure, and prolongs service life.

[0028] Specifically, the fire and heat insulation layer is a halogen-free low-smoke glass fiber tape that is overlapped and wrapped around the outer side of the armor layer, which can better isolate fire and heat, reduce the transfer of external heat to the armor layer, and better protect the armor layer.

[0029] Specifically, the outer sheath is made of low-temperature halogen-free flame-retardant polyolefin material, which expands rapidly when exposed to fire and has a good heat insulation effect.

[0030] Specifically, the metal shielding layer is an aluminum foil metal layer, which resists external electromagnetic interference and reduces electromagnetic radiation outwards, and is light in weight and easy to transport.

[0031] Specifically, in the actual production process, the insulating core includes several copper wires and an insulating layer, an inner shielding layer and a sheath layer extruded on the outside of the copper wire, which is an existing structure. After the insulating core is produced, the insulating core, asbestos filling rope and steel wire rope are twisted by a twisting machine, and then wrapped with non-woven fabric to form an overall structure. Through the insulating layer, metal shielding layer, fireproof layer, armor layer, fire insulation layer and outer sheath layer, the outermost outer sheath layer can expand rapidly and insulate, and then the fire insulation layer is further inward to reduce the heat transfer to the armor layer. The armor layer makes the mechanical strength of the overall cable structure higher, thus forming external protection. On the inner side of the armor layer, a fireproof layer is set to further improve the electrical insulation performance, fire insulation performance and flame retardant performance. The setting of the metal shielding layer and the insulating layer improves the safety performance. A polypropylene filling rope is set between the insulating layer and the metal shielding layer, which has high flame retardant performance and can play a flame retardant effect. Through the setting of several layers of structure, the overall protection of the power cable has high flame retardant performance, which can better meet the use requirements.

[0032] Finally, it should be noted that those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include these modifications and variations.

Claims

1. A fire-retardant power cable, characterized in that: It comprises a twisted wire core, the outer side of which is sequentially provided with an insulating layer, a metal shielding layer, a fireproof layer, an armor layer, a fireproof and heat-insulating layer and an outer sheath layer; The twisted wire core comprises a steel wire rope at the center and an insulating wire core and an asbestos filling rope twisted on the outer periphery of the steel wire rope. The insulating wire core and the asbestos filling rope are arranged alternately, and the outer periphery of the twisted wire core is wrapped with non-woven fabric.

2. A fire-resistant and flame-retardant power cable according to claim 1, characterized in that: The insulating layer is made of cross-linked polyethylene material.

3. A fire-resistant and flame-retardant power cable according to claim 2, characterized in that: The outer side of the insulating layer is concave to form a plurality of notches.

4. The fire-retardant power cable according to claim 1, characterized in that: A polypropylene filling rope is arranged between the insulating layer and the metal shielding layer, and the polypropylene filling rope is arranged opposite to the notch and abuts against the notch.

5. The fire-resistant and flame-retardant power cable according to claim 1, characterized in that: The fireproof layer is composed of ceramic mica tapes wrapped around the outer side of the insulation layer.

6. The fire-retardant power cable according to claim 1, characterized in that: The armor layer is a steel belt armor layer.

7. The fire-retardant power cable according to claim 1, characterized in that: The fire and heat insulation layer is a halogen-free low-smoke glass fiber tape which is overlapped and wrapped around the outer side of the armor layer.

8. The fire-retardant power cable according to claim 1, characterized in that: The outer sheath is made of low-temperature halogen-free flame-retardant polyolefin material.

9. The fire-resistant and flame-retardant power cable according to claim 1, characterized in that: The metal shielding layer is an aluminum foil metal layer.

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