CN212084681U - Cable with long service life - Google Patents

Abstract

The utility model relates to the technical field of cables, a long service life's cable is disclosed, including conductor, flame retardant coating, insulating layer and the inoxidizing coating that from interior to exterior set gradually, the insulating layer includes from interior to exterior first insulation layer and the second insulating layer that sets gradually, the first insulation layer with the thickness ratio scope of second insulating layer does: (1:2) - (1:3). Adopt the utility model discloses technical scheme's long service life's cable, long service life, and have protection against rodents, prevent ant, fire-retardant, fire-resistant, block water, do not have characteristics such as steamed low cigarette.

Description

Cable with long service life

Technical Field

The utility model relates to the technical field of cables, especially, relate to a long service life's cable.

Background

At present, the service life of the electric wire and the electric cable is one of the factors for restricting the competition of domestic cable enterprises, and according to incomplete statistics, more than 85 percent of electric fires in domestic and foreign building fields are caused by short circuit and ignition of circuits due to aging of the electric wire and the electric cable. The safety of the house building electric wire is related to the life safety of common people, the service life of the national standard product of the early domestic electric wire is only 25 years due to factors such as technology, process, materials and the like, the hidden danger is obviously serious in the service life of 25 years compared with 70-year house property rights, the cable insulating layer can be aged gradually in normal operation, and if the service life exceeds the specified age, safety accidents such as electric leakage, fire and the like can be caused.

Damage of rats and ants is one of main damages which also damage cables, and the damage of eating and eroding organisms of termites, rats or wild rats can be caused naturally in the laying places of the electric wires and the cables or thought to the environment, so that the plastic materials of the coated sheaths of the electric wires and the cables are bitten by the rats and the termites to be damaged, the damage of power failure fire disasters and the like can be caused, and social activities and national economy are seriously lost.

SUMMERY OF THE UTILITY MODEL

The utility model aims at: the cable with long service life is provided, and has the characteristics of rat resistance, ant resistance, flame retardance, fire resistance, water resistance, no halogen, low smoke and the like.

In order to achieve the above object, the utility model provides a long service life's cable, including conductor, flame retardant coating, insulating layer and the inoxidizing coating that from interior to exterior set gradually, the insulating layer includes from interior to exterior first insulation layer and the second insulating layer that sets gradually, the first insulation layer with the thickness ratio scope of second insulating layer does: (1:2) - (1:3).

Preferably, the first insulating layer and the second insulating layer are both irradiation cross-linked polyethylene insulating layers, and the first insulating layer and the second insulating layer are connected through a double-layer co-extrusion process.

Preferably, the ratio of the thickness of the first insulating layer to the second insulating layer is 2: 5.

Preferably, the fire-resistant layer is a double-layer phlogopite tape, the double-layer phlogopite tape is wound on the outer side of the conductor in an overlapping mode, and the overlapping rate of the double-layer phlogopite tape is larger than or equal to 50%.

Preferably, the waterproof layer is arranged on the outer side of the second insulating layer and is a water-swelling type composite waterproof tape.

Preferably, the water-swellable composite water-blocking tape longitudinally wraps the outer side of the second insulating layer.

Preferably, the protective layer is a rat-proof termite-proof low-smoke halogen-free flame-retardant polyolefin sheath material.

Preferably, the conductor is any one of the 1 st, 2 nd, 5 th or 6 th conductors in GB/T3956-.

Preferably, a metal protective layer is arranged on the outer side of the conductor.

The embodiment of the utility model provides a long service life's cable, compared with the prior art, its beneficial effect lies in:

the cable with long service life provided by the embodiment of the utility model can select different conductors, thereby meeting the requirements of using different conductors in different occasions, and the fire-resistant layer is arranged outside the conductor, thereby ensuring that the cable can still continue to work for a period of time when a fire disaster happens; the double insulating layers are wrapped outside the fire-resistant layers, so that the service life of the cable is prolonged, and the service life of the cable is ensured to be not less than 70 years under normal use; the protective layer arranged outside the double-insulation layer further improves the service life of the cable.

Drawings

Fig. 1 is a schematic structural diagram of a cable with a long service life according to an embodiment of the present invention;

in the figure, 1, a conductor, 2, a fire-resistant layer, 3, an insulating layer, 31, a first insulating layer, 32, a second insulating layer, 4, a water-resistant layer, 5 and a protective layer.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, and these terms are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, the utility model discloses a cable with long service life, including conductor 1, flame retardant coating 2, insulating layer 3 and inoxidizing coating 5 that set gradually from inside to outside, insulating layer 3 includes first insulating layer 31 and the second insulating layer 32 that sets gradually from inside to outside, and the thickness ratio range of first insulating layer 31 and second insulating layer 32 is: (1:2) - (1:3).

Based on the technical scheme, different types of conductors 1 can be selected, the requirements of using different conductors in different occasions are met, and the fireproof layer 2 is arranged outside the conductor 1, so that the cable can still work for a period of time when a fire disaster happens; the double insulation layer 3 is wrapped outside the fire-resistant layer 2, the service life of the cable can be prolonged by arranging the insulation layer, and the service life of the cable can be ensured to be not less than 70 years under normal use by using the double insulation layer; further, the ratio of the thickness of the first insulating layer to the thickness of the second insulating layer ranges from: (1:2) - (1:3), optimized to ensure a cable life of not less than 70 years under normal use; the outermost protective layer 5 is arranged, and the protective layer 5 further protects the cable, so that the service life of the cable is further prolonged.

Further, the first insulating layer 31 and the second insulating layer 32 are both radiation cross-linked polyethylene insulating layers 3, and the first insulating layer 31 and the second insulating layer 32 are connected through a double-layer co-extrusion process. Wherein, double-layer co-extrusion is a production process of an extruder, and the double-layer co-extrusion means that the inner and outer layers of two cable materials are simultaneously extruded, so that the insulating layer 3 is tightly adhered. The first insulating layer 31 and the second insulating layer 32 are extruded by double-layer co-extrusion, so that the first insulating layer 31 and the second insulating layer 32 are completely bonded, and the normal service life of the cable at the average working temperature of 70 ℃ is ensured to be not less than 70 years. The irradiation crosslinking polyethylene insulating layer has the characteristics of large volume resistance coefficient, small dielectric loss and high temperature-resistant grade, generates little smoke, releases gas without halogen element and is nontoxic under the condition of flame combustion, thereby being suitable for high-rise buildings, hospitals, disaster prevention command and dispatch buildings, stations, civil airports, waiting rooms, key cultural relic protection places, subways, underground markets or manual dense public places and widening the application range of cables.

Preferably, the ratio of the thickness of the first insulating layer 31 to the second insulating layer 32 is 2: 5. Specifically, after the irradiation cross-linked polyethylene insulating layer 3 is subjected to irradiation processing, a linear molecular structure can be converted into a three-dimensional structure, the chemical property and the halogen-free property are improved, the thickness ratio of the extruded first insulating layer 31 to the extruded second insulating layer 32 is adjusted to be 2:5 through double-layer co-extrusion, and the service life of the insulating layer 3 is greatly prolonged.

The fireproof layer 2 is a double-layer phlogopite tape, the double-layer phlogopite tape is lapped and wrapped on the outer side of the conductor 1, and the overlapping rate of the double-layer phlogopite tape is greater than or equal to 50%. The overlapped wrapping is that one part of a wrapping tape is overlapped with one part of a previous spiral, wherein the overlapped part is called a covering rate and is also called an overlapping rate. The double-layer auro-mica tape has the advantages of small expansion coefficient, high dielectric strength, high resistivity, uniform dielectric constant and high heat-resistant grade, can resist the temperature of more than 1000 ℃, can reach the A-grade fire-resistant level (950 plus-1000 ℃), can be repeatedly wrapped at the overlapping rate of not less than 50 percent, ensures that at least two layers of double-layer auro-mica tapes are arranged at the same position, improves the fire-resistant performance of the cable, and prolongs the service life of the cable.

Further, the waterproof layer 4 is arranged on the outer side of the second insulating layer 32, the waterproof layer 4 is a water-swelling type composite waterproof tape, when water enters the cable, the waterproof layer 4 can swell rapidly when meeting water, so that the water can be blocked effectively, the waterproof layer 4 prevents water molecules from entering the cable, and the service life of the cable is further prolonged.

Preferably, the water-swellable composite water-blocking tape is longitudinally wrapped around the outside of the second insulating layer 32. Specifically, the longitudinal wrapping is realized by passively passing a wrapping tape and a cable through a die together, so that a straight wrapping, also called a pulling wrapping, is realized. The water expansion type composite water blocking tape is longitudinally wrapped, so that the effects of water blocking and moisture proofing are achieved.

Wherein, the protective layer 5 is a rat-proof termite-proof low-smoke halogen-free flame-retardant polyolefin sheath material. Specifically, halogen-free means that halogen elements (F, Cl, Br, I and At) are not contained, and the material releases less toxic gas when a fire breaks out, so that secondary damage to a human body can be avoided. The protective layer 5 is extruded by halogen-free low-smoke high-flame-retardant rat-proof and ant-proof polyolefin sheath material, so that the halogen-free low-smoke environment-friendly performance of the outer sheath is ensured, and the effects of rat prevention, ant prevention and flame retardance are achieved.

Further, the conductor 1 is any one of the 1 st, 2 nd, 5 th or 6 th conductors 1 in GB/T3956-. The cable conductor 1 with long service life is composed of the conductors 1, and the cable can more comprehensively cover the cable types with long service life by using the conductors.

Optionally, the outer side of the conductor 1 is provided with a metal protective layer 5. The outer metal coating of conductor can prevent conductor 1 oxidation in the cable, plays the guard action to cable conductor 1, makes the cable more durable, prolongs the cable life-span.

To sum up, the embodiment of the utility model provides a long service life's cable, its long service life's cable can select different kinds of conductors 1 for use, has satisfied the demand that uses different conductors in different occasions, and has set up flame retardant coating 2 in the conductor 1 outside, can ensure that this cable can still continue to work for a period of time when taking place the conflagration; the double insulation layer 3 is wrapped outside the fire-resistant layer 2, the service life of the cable can be prolonged by arranging the insulation layer, and the service life of the cable can be ensured to be not less than 70 years under normal use by using the double insulation layer; further, the ratio of the thickness of the first insulating layer to the thickness of the second insulating layer ranges from: (1:2) - (1:3), optimized to ensure a cable life of not less than 70 years under normal use; the water-swelling type composite water-blocking tape is longitudinally wrapped outside the double insulation layer 3, so that the water-blocking effect can be effectively achieved; the protective layer 5 that the outmost layer set up, protective layer 5 further protect the cable to further improve the life-span of cable, further, protective layer 5 uses polyolefin to contain the fire retardant as the base stock, protection against rodents, the chemical molecule of preventing ant, reaches protection against rodents ant halogen-free low smoke flame retardant's effect.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "top", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.

Claims (9)

1. The utility model provides a long service life's cable, its characterized in that includes conductor, flame retardant coating, insulating layer and the inoxidizing coating that from interior to exterior set gradually, the insulating layer includes first insulating layer and the second insulating layer that from interior to exterior set gradually, first insulating layer with the thickness ratio scope of second insulating layer is: (1:2) - (1:3).

2. The cable of claim 1, wherein the first insulating layer and the second insulating layer are both radiation crosslinked polyethylene insulating layers, and the first insulating layer and the second insulating layer are connected by a double-layer co-extrusion process.

3. The long-life cable of claim 2, wherein the ratio of the thickness of the first insulating layer to the second insulating layer is 2: 5.

4. The cable with the long service life according to claim 1, wherein the fire-resistant layer is a double-layer phlogopite tape, the double-layer phlogopite tape is wound on the outer side of the conductor in an overlapping mode, and the overlapping rate of the double-layer phlogopite tape is greater than or equal to 50%.

5. The long-life cable of claim 1, further comprising a water-blocking layer disposed outside of said second insulating layer, said water-blocking layer being a water-swellable composite water-blocking tape.

6. The long-life cable of claim 5, wherein said water-swellable composite water-blocking tape is wrapped longitudinally outside said second insulating layer.

7. The cable of claim 1, wherein the protective layer is a rat and termite resistant low smoke halogen free flame retardant polyolefin sheathing compound.

8. The cable as claimed in claim 1, wherein the conductor is any one of the 1 st, 2 nd, 5 th or 6 th conductors in GB/T3956-.

9. The long-life cable of claim 8, wherein said conductor is provided with a metallic shield on the outside.

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