CN216212504U

CN216212504U - Fireproof cable with excellent insulating property

Info

Publication number: CN216212504U
Application number: CN202122697299.9U
Authority: CN
Inventors: 解海萍
Original assignee: Tianjin Zhengbiao Jinda Cable Group Co ltd
Current assignee: Tianjin Zhengbiao Jinda Cable Group Co ltd
Priority date: 2021-11-05
Filing date: 2021-11-05
Publication date: 2022-04-05
Anticipated expiration: 2031-11-05

Abstract

A fireproof cable with excellent insulating property comprises a plurality of conductors in the middle, insulating layers and polyolefin sheaths on the outer sides of the conductors, wherein a mechanically wrapped phlogopite tape is adopted outside the conductors, an irradiation cross-linked polyolefin insulating layer is wrapped outside the phlogopite tape, an inner alkali-free glass fiber tape is wrapped outside all cable cores, flame-retardant halogen-free smoke-free alkali-free glass filaments are filled in gaps among the cable cores in the inner alkali-free glass fiber tape, a ceramic polyolefin oxygen isolation layer is directly extruded on the outer layer of the inner alkali-free glass fiber tape, an outer alkali-free glass fiber tape is wrapped outside the ceramic polyolefin oxygen isolation layer, and the polyolefin sheaths are extruded on the outer layer of the outer alkali-free glass fiber tape. The ceramic polyolefin oxygen-barrier layer material can form a compact oxygen-barrier layer under the condition of flame combustion, can prevent flame from damaging a cable core structure, simultaneously reduces volatilization of combustible gas in a cable core, increases dielectric strength and volume resistivity after ablation, and has excellent insulating property.

Description

Fireproof cable with excellent insulating property

Technical Field

The utility model relates to the technical field of cables, in particular to a fireproof cable with excellent insulating property.

Background

People attach increasing importance to public building fire protection power distribution systems. Important public places such as large-scale meeting places, office buildings, hotels, hospitals, subway stations and the like have certain power supply requirements under the condition of fire, the cable can be normally powered, various control signals and alarm signals are not powered off within a certain time, and valuable time is provided for escape, automatic alarm, starting of fire-fighting facilities, rescue and use of emergency equipment. Fire resistant cables were developed earlier abroad and are gradually replacing traditional cables in the united states, the united kingdom and particularly in european union countries. The B1-grade fire-resistant cable not only can be comparable to the traditional fire-resistant cable in the aspects of fire resistance and combustion performance indexes, but also has advantages in the aspects of product specification diversity, large-scale production efficiency, installation and laying and the like. The fire-proof layer of present fireproof cable all chooses the mica tape as the fire-proof layer for use, and mica tape fire-resistant temperature is low, and the mica tape is easily dampened, and the insulating properties reduces after the dampening, produces the potential safety hazard, and the insulating layer of cable generally is sticis by magnesium oxide and forms, arouses the internal insulation fracture easily during the bending for the bend radius of cable is less, is not convenient for use.

Disclosure of Invention

The utility model provides a fireproof cable with excellent insulating property for solving the problems.

The technical scheme adopted by the utility model is as follows:

a fireproof cable with excellent insulating property comprises a plurality of conductors in the middle, insulating layers and polyolefin sheaths on the outer sides of the conductors, wherein a phlogopite tape is wrapped outside the conductors, an irradiation crosslinking polyolefin insulating layer is wrapped outside the phlogopite tape, the phlogopite tape and the irradiation crosslinking polyolefin insulating layer on the outer sides of the conductors form cable cores, all the cable cores are wrapped with an inner alkali-free glass fiber tape, gaps among the cable cores in the inner alkali-free glass fiber tape are filled with flame-retardant halogen-free smoke-free alkali-free glass fibers, a ceramic polyolefin oxygen isolation layer is directly extruded on the outer layer of the inner alkali-free glass fiber tape, an outer alkali-free glass fiber tape is wrapped on the outer layer of the ceramic polyolefin oxygen isolation layer, and the polyolefin sheaths are extruded on the outer layer of the outer alkali-free glass fiber tape.

The conductor adopts a second type conductor of an annealed round copper wire.

An armor layer is additionally arranged between the outer alkali-free glass fiber tape and the polyolefin sheath.

The armor layer is formed by winding a gap type double galvanized steel strip.

The ceramic polyolefin oxygen-isolating layer is made of ceramic halogen-free low-smoke flame-retardant polyolefin material.

The utility model has the beneficial effects that: the ceramic polyolefin oxygen-barrier layer material can form a compact oxygen-barrier layer under the condition of flame combustion, can prevent flame from damaging a cable core structure, does not cause internal insulation cracking during bending, is convenient to use, and simultaneously reduces volatilization of combustible gas in a cable core, so that the corresponding combustion temperature is reduced, the dielectric strength and the volume resistivity are increased after ablation, and the ceramic polyolefin oxygen-barrier layer material has excellent insulating property and is not affected by moisture of a mica tape.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Wherein: 1-a polyolefin jacket; 2-outer layer alkali-free glass fiber belt; 3-a ceramic polyolefin oxygen barrier layer; 4-inner layer alkali-free glass fiber belt; 5-glass fiber; 6-irradiating the cross-linked polyolefin insulating layer; 7-gold mica tape; 8-conductor.

Detailed Description

A fireproof cable with excellent insulating property comprises a plurality of conductors 8 in the middle, insulating layers outside the conductors 8 and a polyolefin sheath 1, wherein the conductors 8 are externally wrapped by a mechanically wrapped auro-mica tape 7, the auro-mica tape 7 is externally wrapped by an irradiation crosslinking polyolefin insulating layer 6, each conductor 8 and the auro-mica tape 7 and the irradiation crosslinking polyolefin insulating layer 6 outside the conductor form cable cores, all the cable cores are externally wrapped by an inner alkali-free glass fiber tape 4, gaps among the cable cores in the inner alkali-free glass fiber tape 4 are filled with flame-retardant halogen-free and alkali-free glass filaments 5, the outer layer of the inner alkali-free glass fiber tape 4 is directly extruded and wrapped by a ceramic polyolefin oxygen-isolating layer 3, the outer layer of the ceramic polyolefin oxygen-isolating layer 3 is wrapped by an outer alkali-free glass fiber tape 2, the outer layer of the alkali-free glass fiber tape 2 is extruded and wrapped by the polyolefin sheath 1, the surface of the extruded polyolefin sheath 1 is smooth and round and is tightly extruded and wrapped on the outer layer of the alkali-free glass fiber tape 2, no air holes visible for normal vision are arranged on the end face.

Conductor 8 adopt annealing round copper line second type conductor, conductor 8 adopts normal transposition or special-shaped pressfitting structure, the flexibility that conductor 8 can be increased in the stranded, improves mechanical strength, adjacent layer transposition is opposite, can increase conductor 8's structural stability.

And a pressure-resistant armor layer is additionally arranged between the outer alkali-free glass fiber tape 2 and the polyolefin sheath 1. The armor layer is formed by winding gap type double galvanized steel strips, and the armor layer can ensure the performances of vibration resistance, creep resistance, tensile resistance, compressive resistance, biological resistance and the like of the cable.

The ceramic polyolefin oxygen-isolating layer 3 is made of ceramic halogen-free low-smoke flame-retardant polyolefin materials, the ceramic halogen-free low-smoke flame-retardant polyolefin materials can form a compact oxygen-isolating layer under the flame combustion condition, so that not only can the damage of flame to the inner structure of the cable core be prevented, but also the integrity of the cable core can be ensured, and meanwhile, the volatilization of combustible gas in the cable core can be reduced, so that the corresponding combustion temperature is reduced. The ceramic polyolefin oxygen-isolating layer 3 is wrapped by the outer alkali-free glass fiber tape 2 made of the same material, is compact and round, has the overlapping rate of not less than 15% of the bandwidth, can reduce the dropping substances generated by ceramic polyolefin incrustation under the condition of flame combustion, and can also ensure the shaping and ceramic of the polyolefin at the initial stage of combustion.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims

1. A fireproof cable with excellent insulating property is characterized by comprising a plurality of conductors (8) in the middle, the cable comprises an insulating layer and a sheath (1) on the outer side of a conductor (8), a phlogopite tape (7) is wound and coated outside the conductor (8), a radiation crosslinking polyolefin insulating layer (6) is wound and coated outside the phlogopite tape (7), each conductor (8), the phlogopite tape (7) and the radiation crosslinking polyolefin insulating layer (6) on the outer side of each conductor form a cable core, an inner alkali-free glass fiber tape (4) is wound and coated outside all cable cores, flame-retardant halogen-free smokeless alkali-free glass fibers (5) are filled in gaps among the cable cores in the inner alkali-free glass fiber tape (4), a ceramic polyolefin oxygen isolation layer (3) is directly extruded and coated on the outer layer of the inner alkali-free glass fiber tape (4), an outer alkali-free fiber tape (2) is wound and coated outside the ceramic polyolefin oxygen isolation layer (3), and a polyolefin sheath (1) is extruded and coated on the outer layer of the outer alkali-free glass fiber tape (2).

2. Fire-resistant cable with excellent insulation properties according to claim 1, characterized in that the conductor (8) is a second type conductor of annealed round copper wire.

3. A fire-resistant cable with excellent insulation performance according to claim 1, characterized in that an armor layer is additionally arranged between the outer alkali-free glass fiber tape (2) and the polyolefin sheath (1).

4. The fireproof cable with excellent insulation performance according to claim 3, wherein the armor layer is formed by winding gap type double galvanized steel strips.

5. The fireproof cable with excellent insulation property according to claim 1, wherein the ceramic polyolefin oxygen-barrier layer (3) is made of ceramic halogen-free low-smoke flame-retardant polyolefin material.