CN213070668U

CN213070668U - Fire-resistant medium voltage cable

Info

Publication number: CN213070668U
Application number: CN202021876967.3U
Authority: CN
Inventors: 杨孟衡
Original assignee: Guangzhou Xinxing Cables Industry Co ltd
Current assignee: Guangzhou Xinxing Cables Industry Co ltd
Priority date: 2020-09-02
Filing date: 2020-09-02
Publication date: 2021-04-27
Anticipated expiration: 2030-09-02

Abstract

A fire-resistant medium voltage cable comprises a cable conductor, a conductor shield, a cross-linked polyethylene insulating layer, an insulating shield and a protective structure, the extruded system in cable conductor's the outside has the conductor shield, the extruded system in the outside of conductor shield has cross-linked polyethylene insulating layer and insulation shield and protective structure, protective structure includes the shielding layer, the flame retardant coating, the isolation layer, the flame retardant coating, steel band armor enhancement layer and high fire-retardant low smoke and zero halogen polyolefin restrictive coating, the extruded system in the outside of cross-linked polyethylene insulating layer has insulation shield, insulation shield's the outside overlapping winding has the shielding layer, the outside overlapping of shielding layer has the flame retardant coating around the winding, the outside overlapping of flame retardant coating has the isolation layer, the isolation layer overlapping has the flame retardant coating around the winding, the outside overlapping of flame retardant coating has steel band armor enhancement layer around the winding, the outside extrusion of steel band armor enhancement layer has high fire-retardant low smoke.

Description

Fire-resistant medium voltage cable

Technical Field

The utility model relates to a cable specifically is a fire-resistant medium voltage cable.

Background

A cable is a power or signal transmission device, and is generally composed of several wires or groups of wires.

The existing cable suitable for 8.7/15kV rated voltage in the wire and cable production industry has poor shielding effect, interference exists among cables, and meanwhile, the cable does not have good flame-retardant and fireproof performance.

Disclosure of Invention

To the above situation, for overcoming prior art's defect, the utility model provides a fire-resistant medium voltage cable, the effectual current cable shielding effect who is applicable to wire and cable production industry rated voltage 8.7/15kV of having solved is poor, has the interference between the cable, does not have fine fire-retardant fire behavior's problem simultaneously.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model comprises a cable conductor, a conductor shield, a cross-linked polyethylene insulating layer, an insulating shielding layer, a fire-proof layer, a steel strip armor reinforcing layer and a high-flame-retardant low-smoke halogen-free polyolefin sheath layer, wherein the outer side of the cable conductor is extruded with the conductor shield, the outer side of the conductor shield is extruded with the cross-linked polyethylene insulating layer, the outer side of the cross-linked polyethylene insulating layer is extruded with the insulating shielding layer, a protective structure comprises the shielding layer, the fire-proof layer, the insulating layer, the fire-proof layer, the steel strip armor reinforcing layer and the high-flame-retardant low-smoke halogen-free polyolefin sheath layer, the outer side of the cross-linked polyethylene insulating layer is extruded with the insulating shielding layer, the outer side of the insulating shielding layer is overlapped and wound with the shielding layer, the outer side of the shielding layer is overlapped with the fire-proof layer, the outer, the high flame-retardant low-smoke halogen-free polyolefin sheath layer is extruded outside the steel-tape armored reinforcing layer.

Preferably, the fire-resistant layer consists of a mica tape and a high-fire-resistant ceramic fire-resistant composite tape.

Preferably, the steel-tape armored reinforcing layer is formed by winding steel tapes.

Preferably, the shielding layer is a member made of a copper strip material.

Has the advantages that: the utility model discloses a conductor shield of cable conductor's the extruded conductor shield in the outside, can carry out better shielding to the cable conductor in the conductor shield, make it have better insulating properties through the crosslinked polyethylene insulating layer that sets up, the extruded insulation shield layer in the crosslinked polyethylene insulating layer outside and the winding shielding layer are overlapped in the insulation shield layer outside, further enhancement shielding effect, the outside of shielding layer is overlapped and is had the flame retardant coating around the package, make cable conductor have better fire resistance, the isolation layer overlaps the flame retardant coating around the package, make cable conductor have better fire behavior, the extruded high fire-retardant low smoke and zero halogen polyolefin restrictive coating in the steel band armor enhancement layer outside, make cable conductor have better fire behaviour.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of the overall structure of the present invention;

reference numbers in the figures: 1. a cable conductor; 2. a conductor shield; 3. a crosslinked polyethylene insulating layer; 4. an insulating shield layer; 5. a shielding layer; 6. a refractory layer; 7. an isolation layer; 8. a fire barrier layer; 9. a steel tape armored reinforcement layer; 10. high flame-retardant low-smoke halogen-free polyolefin sheath layer.

Detailed Description

The following describes the present invention in further detail with reference to fig. 1.

In the first embodiment, as shown in fig. 1, the utility model provides a fire-resistant medium voltage cable, which comprises a cable conductor 1, a conductor shield 2, a crosslinked polyethylene insulating layer 3, an insulating shield layer 4, a shield layer 5, a fire-resistant layer 6, an isolating layer 7, a fire-resistant layer 8, a steel tape armoring reinforcing layer 9 and a high-fire-retardant low-smoke halogen-free polyolefin sheath layer 10, wherein the conductor shield 2 is extruded outside the cable conductor 1, the crosslinked polyethylene insulating layer 3 is extruded outside the conductor shield 2, the insulating shield layer 4 is extruded outside the crosslinked polyethylene insulating layer 3, the protective structure comprises the shield layer 5, the fire-resistant layer 6, the isolating layer 7, the fire-resistant layer 8, the steel tape armoring reinforcing layer 9 and the high-fire-retardant low-smoke halogen-free polyolefin sheath layer 10, the insulating shield layer 4 is extruded outside the crosslinked polyethylene insulating layer 3, the shield layer 5 is wound outside the insulating shield layer 4, the fire-resistant layer 6, the outside of flame retardant coating 6 overlaps around having isolation layer 7, and isolation layer 7 overlaps around having flame retardant coating 8, and the outside of flame retardant coating 8 overlaps around having steel band armor enhancement layer 9, and the outside extrusion of steel band armor enhancement layer 9 has high fire-retardant low smoke and zero halogen polyolefin restrictive coating 10.

The fire-resistant layer 6 is composed of a mica tape and a high-fire-resistant ceramic fire-resistant composite tape, so that the composite tape has better fire resistance.

The steel strip armored reinforcement layer 9 is formed by winding steel strips, so that the steel strip armored reinforcement layer 9 has better strength.

The shielding layer 5 is a member made of copper strip, and is convenient for shielding.

Has the advantages that: the utility model discloses a conductor shield 2 of cable conductor 1's the extruded conductor shield in the outside, can carry out better shielding to cable conductor 1 in the conductor shield 2, make it have better insulating properties through the crosslinked polyethylene insulating layer 4 that sets up, the extruded insulation shield 4 in the 3 outsides of crosslinked polyethylene insulating layer and the 4 outside overlapping winding shielding layer 5 of insulation shield, further enhancement shielding effect, the outside overlapping of shielding layer 5 has flame retardant coating 6 around the package, make cable conductor 1 have better fire resistance, isolation layer 7 overlaps the flame retardant coating 8 around the package, make cable conductor 1 have better fire behavior, the extruded high fire-retardant low smoke and zero halogen polyolefin restrictive coating 10 in the steel band armor enhancement layer 9 outsides, make cable conductor 1 have better fire behaviour.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a fire-resistant medium voltage cable, includes cable conductor (1), conductor shield (2), crosslinked polyethylene insulating layer (3), insulation shield (4), shielding layer (5), flame retardant coating (6), isolation layer (7), flame retardant coating (8), steel band armor enhancement layer (9) and high fire-retardant low smoke and zero halogen polyolefin restrictive coating (10), its characterized in that: the cable comprises a cable conductor (1), a conductor shield (2) is extruded on the outer side of the cable conductor, a cross-linked polyethylene insulating layer (3) is extruded on the outer side of the conductor shield (2), an insulating shielding layer (4) is extruded on the outer side of the cross-linked polyethylene insulating layer (3), a protective structure comprises a shielding layer (5), a flame retardant coating (6), an isolation layer (7), a fireproof layer (8), a steel strip armor reinforcing layer (9) and a high-flame-retardant low-smoke halogen-free polyolefin sheath layer (10), an insulating shielding layer (4) is extruded on the outer side of the cross-linked polyethylene insulating layer (3), the shielding layer (5) is wound on the outer side of the insulating shielding layer (4) in an overlapping mode, the flame retardant coating (6) is wound on the outer side of the shielding layer (6), the fireproof layer (7) is wound on the outer side of the isolation layer (7) in an overlapping mode, the steel strip, the high flame-retardant low-smoke halogen-free polyolefin sheath layer (10) is extruded at the outer side of the steel tape armored reinforcing layer (9).

2. Fire-resistant medium voltage cable according to claim 1, characterized in that said fire-resistant layer (6) consists of a mica tape and a ceramic fire-resistant composite tape of the high fire-resistant type.

3. Fire-resistant medium voltage cable according to claim 1, characterized in that the steel-tape-armored reinforcement layer (9) is wound from steel tape.

4. A fire resistant medium voltage cable according to claim 1, characterized in that the shielding layer (5) is a member of copper tape.