CN210039753U

CN210039753U - Flame-retardant power cable

Info

Publication number: CN210039753U
Application number: CN201920620527.2U
Authority: CN
Inventors: 张峰; 李明明; 易树华
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-05-02
Filing date: 2019-05-02
Publication date: 2020-02-07
Anticipated expiration: 2029-05-02

Abstract

The utility model provides a fire-retardant power cable, includes at least three first conductor, the first conductor outside is equipped with the first insulation layer, and the first insulation layer outside is equipped with the isolation layer, is equipped with between isolation layer and the first insulation layer and does not have steamed fire-retardant layer to fill, isolation layer outside parcel has the waterproof layer, and the waterproof layer outside is equipped with closely arranging the compression layer in the waterproof layer outside, and compression layer outside parcel has the hydrotalcite layer, and the hydrotalcite layer outside is equipped with the heat-resistant layer, the utility model discloses utilize semicircular compression layer to replace the armor, make the original weight reduction of cable, be equipped with the silk copper wire in the heat-resistant layer in the outside, make the tensile and the compressive property reinforcing of cable, still be equipped with hydrotalcite layer and the double-deck protection of steamed fire-retardant layer, can effectually carry out fire-retardant to the cable, in case burn in the fire moreover, the smoke.

Description

Flame-retardant power cable

Technical Field

The utility model relates to a cable conductor structure especially relates to a fire-retardant power cable.

Background

In recent years, in a fire accident of a power system on a global scale, the rate of interruption of power supply of the power system due to ignition of a power cable tends to increase. Therefore, fire spreading is prevented by adopting the flame-retardant cable in places with a large number of electrical equipment and densely laid cables, such as power plants and transformer substations, and uninterrupted power supply of important loops is ensured by adopting the flame-retardant cable, which is increasingly important.

The flame-retardant cable means: under the specified test conditions, the test specimen is burnt, after the test fire source is removed, the flame spread is only within a limited range, and the residual flame or burn is a cable which can be self-extinguished within a limited time. Its fundamental characteristics are: in the event of a fire, may burn out and fail to operate, but may prevent the spread of the fire.

However, when the cable is burnt, a large amount of dense smoke and halogen acid gas can be released, the halogen acid gas has corrosive damage to surrounding electrical equipment, and rescuers can put out a fire by approaching the scene with a gas mask. When the cable is burnt, the cable causes harm to surrounding electrical equipment and rescue workers, and is not beneficial to fire-extinguishing rescue work, so that serious secondary harm is caused, and certain influence is also caused to the environment.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problem that above-mentioned prior art exists, the utility model provides a flame retardant power cable, this cable is equipped with the protection of the dual flame retardant material of halogen-free flame retardant layer and hydrotalcite layer, not only can make the cable extinguish by oneself after the burning, also can guarantee that this cable can use a period of time when taking place the conflagration, and hydrotalcite layer has the advantage of aluminium hydroxide and magnesium hydroxide fire retardant as fire retardant layer concurrently, they are respectively not enough again, the effectual material cost and the manufacturing cost who has reduced low smoke and zero halogen product, and in case when being in the burning in the fire, the smoke volume is little, can not release toxic gas, the work of conveniently rescuing, reduce the harm to the environment.

The utility model provides a technical scheme that its technical problem adopted: the flame-retardant power cable comprises at least three first conductors, wherein a first insulating layer is arranged on the outer side of each first conductor, an isolating layer is arranged on the outer side of the first insulating layer, a halogen-free flame-retardant layer is arranged between the isolating layer and the first insulating layer for filling, a waterproof layer is wrapped on the outer side of the isolating layer, a compression layer which is tightly arranged on the outer side of the waterproof layer is arranged on the outer side of the waterproof layer, a hydrotalcite layer is wrapped on the outer side of the compression layer, a heat-resistant layer is arranged on the outer side of the hydrotalcite layer, and the cable is protected by the halogen-free flame-retardant layer and the hydrotalcite layer, so that the cable can be extinguished automatically after burning, the cable can be used for a period of time when a fire disaster occurs, and the elastic compression layer is used for replacing an armor layer, the dead weight of the.

In order to further improve the structure, a plurality of second conductors are arranged between the first insulating layer and the isolating layer, the second insulating layers are arranged on the outer sides of the second conductors, and the first conductors wrapped by the first insulating layers and the second conductors wrapped by the second insulating layers are mutually twisted and positioned in the waterproof layers, so that one power cable is not only used for transmitting power, but also can be used for other functions such as communication transmission or signal transmission, the time and the cost for erecting other cables are reduced, and the purpose of one cable is achieved.

Further perfect, the compression layer is the hollow semicircle shape of inboard, makes the cable receive certain pressure when, and the outer compression layer extrusion shrink avoids inboard conductor to receive the harm.

Further perfection, a plurality of fine copper wires are arranged in the heat-resistant layer, and the mechanical property of the power cable is enhanced.

The halogen-free flame-retardant layer is cross-linked ethylene without halogen, the material not only has excellent electrical property of polyethylene, but also has greatly improved mechanical property compared with common polyethylene, particularly the tensile strength is several times of that of common polyethylene, in addition, the environmental stress resistance of the material is also greatly improved, the environmental stress resistance of the common polyethylene material is poorer, the insulation cracking phenomenon is easy to occur in the use process, but the environmental stress resistance of the novel material is greatly improved, the insulation cracking phenomenon of a cable in the use process is avoided, and the service life of the cable is greatly prolonged.

Further perfect, the isolation layer adopts the copper wire to weave shielding structure, avoids the magnetism that the cable produced to produce to other equipment production interference.

The first insulating layer, the second insulating layer and the heat-resistant layer are made of heat-resistant rubber materials, so that the cable can stably run at high temperature.

Further perfection, the first conductor and the second conductor are formed by stranding a plurality of strands of copper wires, so that the electric conductivity of the cable is good.

The utility model discloses profitable effect is: the utility model discloses be equipped with dual fire-retardant layer, make power cable can extinguish by oneself in the time of injecing, prevent stretching of intensity of a fire, the cigarette volume is little during the burning moreover, has adopted no halogen flame retardant material, can not produce toxic gas, makes things convenient for first-aid staff's rescue work, and is little to the harm of environment, and this cable is light in quality in addition, and mechanical properties is good, can realize the multi-purpose advantage of a cable.

Drawings

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

Description of reference numerals: 1. the cable comprises a first conductor, 2, a first insulating layer, 3, an isolating layer, 4, a halogen-free flame-retardant layer, 5, a waterproof layer, 6, a pressure-bearing layer, 7, a hydrotalcite layer, 8, a heat-resistant layer, 9, a second conductor, 10 and a second insulating layer

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

referring to figure 1: the embodiment of the invention relates to a flame-retardant power cable, which comprises at least three first conductors 1, wherein a first insulating layer 2 is arranged on the outer side of each first conductor 1, an isolating layer 3 is arranged on the outer side of each first insulating layer 2, a halogen-free flame-retardant layer 4 is arranged between each isolating layer 3 and the corresponding first insulating layer 2 for filling, a waterproof layer 5 is wrapped on the outer side of each isolating layer 3, a compression layer 6 which is tightly arranged on the outer side of the waterproof layer 5 is arranged on the outer side of each waterproof layer 5, a hydrotalcite layer 7 is wrapped on the outer side of each compression layer 6, a heat-resistant layer 8 is arranged on the outer side of each hydrotalcite layer 7, a plurality of second conductors 9 are arranged between each first insulating layer 2 and each isolating layer 3, a second insulating layer 10 is arranged on the outer side of each second conductor 9, the first conductors 1 wrapped by the first insulating layers 2 and the second conductors 9, the heat-resistant layer 8 is internally provided with a plurality of fine copper wires, the halogen-free flame-retardant layer 4 is a halogen-free cross-linked ethylene material, the isolation layer 3 is of a copper wire braided shielding structure, the first insulation layer 2, the second insulation layer 10 and the heat-resistant layer 8 are made of heat-resistant rubber materials, and the first conductor 1 and the second conductor 9 are formed by twisting a plurality of strands of copper wires.

The cable is provided with double flame-retardant layers, the halogen-free flame-retardant layer 4 is a first flame-retardant layer and consists of halogen-free crosslinked ethylene, the material not only has excellent electrical property of polyethylene, but also has greatly improved mechanical property compared with common polyethylene, particularly the tensile strength is several times of that of common polyethylene, in addition, the environmental stress resistance of the material is also greatly improved, the environmental stress resistance of the common polyethylene material is poor, the insulation cracking phenomenon is easy to occur in the use process, but the environmental stress resistance of the novel material is greatly improved, the insulation cracking phenomenon of the cable in the use process is avoided, and the service life of the cable is greatly prolonged; the hydrotalcite layer 7 has the advantages of aluminium hydroxide and magnesium hydroxide fire retardants as the second flame retardant layer, and overcomes the defects of the hydrotalcite layer and the magnesium hydroxide fire retardants, so that the material cost and the manufacturing cost of low-smoke halogen-free products are effectively reduced, and once the hydrotalcite layer is burnt in a fire, the smoke quantity is small, toxic gas can not be released, the hydrotalcite layer facilitates rescue work, harm to the environment is reduced, the two flame retardant layers made of different materials not only have the function of preventing fire from spreading when the cable is in a fire disaster, but also can stably run for a period of time in the fire disaster, convenience is provided for escaping and leading people to disaster, and casualties are reduced.

While the invention has been shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the appended claims.

Claims

1. A flame retardant power cable comprising at least three first conductors (1), characterized in that: first conductor (1) outside is equipped with first insulation layer (2), and the first insulation layer (2) outside is equipped with isolation layer (3), is equipped with between isolation layer (3) and the first insulation layer (2) and does not have steamed fire-retardant layer (4) and fills, isolation layer (3) outside parcel has waterproof layer (5), and the waterproof layer (5) outside is equipped with compression layer (6) of closely arranging in waterproof layer (5) outside, and the outside parcel of compression layer (6) has hydrotalcite layer (7), and the hydrotalcite layer (7) outside is equipped with heat-resistant layer (8).

2. A flame retardant power cable according to claim 1, wherein: be equipped with a plurality of second conductor (9) between first insulating layer (2) and isolation layer (3), second conductor (9) outside is equipped with second insulating layer (10), first conductor (1) of first insulating layer (2) parcel and second conductor (9) of second insulating layer (10) parcel are twisted each other and are located waterproof layer (5).

3. A flame retardant power cable according to claim 1, wherein: the compression layer (6) is in a semicircular shape with a hollow inner side.

4. A flame retardant power cable according to claim 1, wherein: a plurality of thin copper wires are arranged in the heat-resistant layer (8).

5. A flame retardant power cable according to claim 1, wherein: the halogen-free flame-retardant layer (4) is a halogen-free cross-linked ethylene material.

6. A flame retardant power cable according to claim 1, wherein: the isolation layer (3) is of a copper wire braided shielding structure.

7. A flame retardant power cable according to claim 1 or 2, wherein: the first insulating layer (2), the second insulating layer (10) and the heat-resistant layer (8) are made of heat-resistant rubber materials.

8. A flame retardant power cable according to claim 1 or 2, wherein: the first conductor (1) and the second conductor (9) are formed by stranding a plurality of strands of copper wires.