CN104616746A - Aluminum alloy flexible cable for easy construction - Google Patents

Abstract

The invention discloses an aluminum alloy flexible cable convenient for construction, which comprises three conductive wire cores, wherein a plurality of first aluminum alloy round conductors are stranded on the outer surface of a round aramid fiber core; the outer surface of the polyethylene insulating tape is coated with a polyvinyl chloride inner liner layer, and a flame-retardant polyolefin elastic sheath layer is positioned on the outer surface of the polyvinyl chloride inner liner layer; the round aramid fiber core is formed by twisting a plurality of aramid fiber yarns; a fire-resistant mica tape is wrapped on the outer surfaces of the three conductive wire cores, and an insulating sheath layer is wrapped on the outer surface of the fire-resistant mica tape; the insulating sheath layer comprises the following components: thermoplastic polyurethane elastomer, low-density polyethylene, ethylene ethyl acrylate, ethylene butylene copolymer, silicon dioxide, butyronitrile compound, chlorinated polyethylene, zinc stannate, magnesium hydroxide and composite molybdenum smoke suppressant. The invention greatly reduces the eddy current, reduces the loss of the line, improves the conductivity, bending property and corrosion resistance of the cable, and ensures that the material has good carbon forming effect during combustion.

Description

Aluminum alloy flexible cable for easy construction

technical field

The invention relates to a communication power cable, in particular to an aluminum alloy flexible cable which is convenient for construction.

Background technique

The flexible cable for communication power supply is a power supply connection line for communication facilities, and is widely used in power distribution systems such as telecommunication bureaus and distribution cabinets. Flexible cables for communication power supply not only require good flexibility to facilitate laying in narrow spaces or similar situations, but also require ideal flame retardancy to meet the requirements for use in occasions with strict fire ratings. Although not limited to the flexible cables for communication power sources listed above, although each has corresponding technical effects, there are the following common shortcomings: First, since they are all made of twisted fine copper wires as conductors, and this conductor is known as Five types of copper conductors, so the degree of softness does not meet the desired requirements. And due to the poor softness, the bending radius is limited, so when laying in a narrow space, obstructed by immovable objects or even corners, it is easy to affect the construction speed; second, due to technical prejudice, it is generally used As the conductor of flexible cables, copper not only has blindness in the rational use of raw materials, but also leads to high manufacturing costs for flexible cables; The labor intensity of construction personnel is high, and the labor cost is high.

Contents of the invention

The invention provides an aluminum alloy flexible cable that is convenient for construction. The aluminum alloy flexible cable improves the flame retardancy of the material, and the oxygen index representing the flame retardancy is extremely high, and makes the material have a good charring effect when burning, and also improves the flame retardancy of the material. The electrical conductivity, bending performance and corrosion resistance of the cable are improved, and the space and installation cost of the installation layout are reduced.

In order to achieve the above object, the technical solution adopted by the present invention is: an aluminum alloy flexible cable that is convenient for construction, including three conductive wire cores, the conductive wire cores further include a circular aramid fiber core, and the circular aramid fiber core There are several first aluminum alloy round conductors stranded on the outer surface, and several first aluminum alloy round conductors form an inner conductive layer, and several second aluminum alloy round conductors are stranded on the outer surface of the inner conductive layer, and several An outer conductive layer is formed based on the second aluminum alloy round conductor, and a polyethylene insulating tape is wrapped around the outer surface of the outer conductive layer;

The outer surface of the polyethylene insulating tape is covered with a polyvinyl chloride inner liner, a flame-retardant polyolefin elastic sheath layer is located on the outer surface of the polyvinyl chloride inner liner, the polyvinyl chloride inner liner and the flame-retardant A PVC foam insulation layer is arranged between the polyolefin elastic sheath layers;

The circular aramid fiber core is formed by twisting several aramid fiber filaments; a fire-resistant mica tape wraps around the outer surfaces of the three conductive wire cores, and the outer surface of the fire-resistant mica tape is covered with an insulating sheath. The sheath layer, the insulating sheath layer is composed of the following components:

Thermoplastic polyaminophenol elastomer 80~100 parts,

10~20 parts of low-density polyethylene with a melt index of 1~8g/10min,

Ethylene ethyl acrylate 8~15 parts,

Ethylene Butene Copolymer 5~10 parts,

Silica 4~8 parts,

Nitrile compound 8~20 parts,

Chlorinated polyethylene 5~10 parts,

Zinc stannate 5~15 parts,

Magnesium hydroxide 5~12 parts,

Composite molybdenum smoke suppressant 2~8 parts,

Montmorillonite 1~5 parts,

Calcium-zinc composite stabilizer 1~3 parts,

Bis(3,5-tertiary butyl-4-hydroxyphenyl) sulfide 1~3 parts,

Zinc stearate 2~4 parts.

The technical scheme further improved in the above-mentioned technical scheme is as follows:

1. In the above solution, the twisting direction of the first aluminum alloy round conductor is right-hand twisting, and the twisting direction of the second aluminum alloy round conductor is left-hand twisting.

2. In the above scheme, several PP filling ropes are filled between the refractory mica tape and the conductive core.

3. In the above solution, there are several cavities in the PVC foam insulation layer, and the volume of these cavities accounts for 30-45% of the PVC foam insulation layer.

Due to the use of the above-mentioned technical solutions, the present invention has the following advantages compared with the prior art:

1. The flexible aluminum alloy cable of the present invention, which is convenient for construction, adopts two conductive layers, the inner conductive layer is formed by twisting several "Z"-shaped conductors, and the outer conductive layer is formed by twisting several trapezoidal conductors, which greatly reduces the The eddy current is reduced, the loss of the line is reduced, the electrical conductivity, bending performance and corrosion resistance of the cable are improved, the calorific value of the cable is reduced, and the continuous electrical performance of the cable can be guaranteed to be stable when it is overloaded and overheated for a long time.

2. The flexible aluminum alloy cable of the present invention is easy to construct, and its insulating sheath layer includes 80-100 parts of thermoplastic polyurethane elastomer, 10-20 parts of low-density polyethylene with a melt index of 1-8g/10min, ethylene 8~15 parts of ethyl acrylate, 1~3 parts of calcium zinc composite stabilizer, 1~3 parts of bis(3,5-tertiary butyl-4-hydroxyphenyl) sulfide, 2~4 parts of zinc stearate , 5~10 parts of ethylene butene copolymer, 4~8 parts of silicon dioxide, 5~10 parts of chlorinated polyethylene, so that the first sheath layer combines their respective advantages and improves the weather resistance and flame retardancy. Stability effect, radiation resistance characteristics, while improving the insulation performance, surface wear resistance and surface hardness, the surface matte effect is excellent and reduces the shrinkage of the material; secondly, the insulating sheath layer further contains zinc stannate 5 ~15 parts, 5~12 parts of magnesium hydroxide, 2~8 parts of molybdenum compound smoke suppressant, 1~5 parts of montmorillonite and synergistic effect with other components, 8~20 parts of nitrile compound, which greatly improves the material quality. Flame retardancy, the oxygen index representing flame retardancy is extremely high, and makes the material have a good char formation effect when burning, forming a stable hollow composite carbon structure, which prevents the secondary combustion and flame propagation of the material.

3. The flexible aluminum alloy cable of the present invention is convenient for construction. The outer surface of the polyethylene insulating tape is covered with a polyvinyl chloride inner liner, and a flame-retardant polyolefin elastic sheath is located on the outer surface of the polyvinyl chloride inner liner. A PVC foam insulation layer is arranged between the polyvinyl chloride inner liner and the flame-retardant polyolefin elastic sheath layer, so that the flexible cable has high tensile strength, high carrying capacity, high flexibility, and is easy to bend, and its structure Compact, the minimum bending radius is reduced to 4 times the cable diameter, which reduces the space for installation layout, reduces installation costs, and is easier to lay.

Description of drawings

Accompanying drawing 1 is the structural schematic diagram of the flexible aluminum alloy cable of the present invention that is convenient for construction.

In the above drawings: 1. Circular aramid fiber core; 2. Inner conductive layer; 21. First aluminum alloy round conductor; 3. Outer conductive layer; 31. Second aluminum alloy round conductor; 4. Polyethylene insulating tape ;5, polyvinyl chloride lining layer; 6, PVC foam insulation layer; 61, cavity; 7, flame-retardant polyolefin elastic sheath layer; 8, conductive core; 9, fire-resistant mica tape; 10, insulating sheath layer; 11, PP filling rope.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing and embodiment:

Embodiments 1 to 5: An aluminum alloy flexible cable that is convenient for construction, including three conductive wire cores 8, the conductive wire cores 8 further include a circular aramid fiber core 1, and the outer surface of the circular aramid fiber core 1 is twisted There are several first aluminum alloy round conductors 21, and several first aluminum alloy round conductors 21 form the inner conductive layer 2, and the outer surface of the inner conductive layer 2 is twisted with several second aluminum alloy round conductors 31, And a plurality of the second aluminum alloy round conductors 31 form the outer conductive layer 3, and a polyethylene insulating tape 4 is wrapped around the outer surface of the outer conductive layer 3;

The outer surface of the polyethylene insulating tape 4 is covered with a polyvinyl chloride inner liner 5, and a flame-retardant polyolefin elastic sheath layer 7 is located on the outer surface of the polyvinyl chloride inner liner 5, and the polyvinyl chloride inner liner A PVC foam insulation layer 6 is arranged between the layer 5 and the flame-retardant polyolefin elastic sheath layer 7;

The circular aramid fiber core 1 is formed by twisting several aramid fiber filaments 6; a fire-resistant mica tape 9 wraps around the outer surfaces of the three conductive wire cores 8, and the outer surface of the fire-resistant mica tape 9 is Coated with an insulating sheath layer 10; the above-mentioned insulating sheath layer 10 is composed of the following components, specifically as shown in Table 1:

Table 1

Filled with some PP filling ropes 11 between the above-mentioned refractory mica tape 9 and the conductive wire core 8.

There are several cavities 61 in the above-mentioned PVC foam insulation layer 6 , and the volume of these several cavities 61 accounts for 42% of the PVC foam insulation layer 6 .

The twisting direction of the first aluminum alloy round conductor 21 is right-hand twisting, and the twisting direction of the second aluminum alloy round conductor 31 is left-hand twisting.

The properties of the flexible aluminum alloy cables that are convenient for construction in Examples 1 to 5 are shown in Table 2:

Table 2

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention shall fall within the protection scope of the present invention.

Claims (5)

1. the aluminium alloy flexible cable of a constructability, it is characterized in that: comprise three conductor wire cores (8), this conductor wire core (8) comprises circular aramid fiber core (1) further, this circular aramid fiber core (1) outer surface is stranded some first aluminum alloy round conductors (21), and some described first aluminum alloy round conductors (21) form inner conducting layer (2), this inner conducting layer (2) outer surface is stranded some second aluminum alloy round conductors (31), and some described second aluminum alloy round conductors (31) form outer conducting layer (3), one polyethylene insulation band (4) is wrapped in described outer conducting layer (3) outer surface,

Described polyethylene insulation band (4) outer surface is coated with a polyvinyl chloride inner covering (5), one fire retardant polyolefin flexible sheath layer (7) is positioned at described polyvinyl chloride inner covering (5) outer surface, is provided with PVC foam insulating barrier (6) between described polyvinyl chloride inner covering (5) and fire retardant polyolefin flexible sheath layer (7);

Described circular aramid fiber core (1) forms by some aramid fiber silks (6) are stranded; One fire-resistant isinglass belt (9) is wrapped is overlying on three described conductor wire core (8) outer surfaces, and described fire-resistant isinglass belt (9) outer surface is coated with insulating jacket layer (10), and described insulating jacket layer (10) is composed of the following components:

80 ~ 100 parts, thermoplastic poly ammonia phenol elastomer,

Melt index is the low density polyethylene (LDPE) 10 ~ 20 parts of 1 ~ 8g/10min,

Ethylene ethyl acrylate 8 ~ 15 parts,

Ethylene-butylene copolymer 5 ~ 10 parts,

Silicon dioxide 4 ~ 8 parts,

Butyronitrile compound 8 ~ 20 parts,

Haloflex 5 ~ 10 parts,

Zinc 5 ~ 15 parts,

Magnesium hydroxide 5 ~ 12 parts,

Compound molybdenum smoke suppressant 2 ~ 8 parts,

Imvite 1 ~ 5 part,

Calcium-zinc composite stabilizing agent 1 ~ 3 part,

Two (3,5-, tri-grades of butyl-4-hydroxy phenyls) thioether 1 ~ 3 part,

Zinc stearate 2 ~ 4 parts.

2. the aluminium alloy flexible cable of constructability according to claim 1, is characterized in that: described first aluminum alloy round conductor (21) direction of lay is that dextrad is stranded, and described second aluminum alloy round conductor (31) direction of lay is that left-hand is stranded.

3. the aluminium alloy flexible cable of constructability according to claim 1, is characterized in that: have several cavities (61) in described PVC foam insulating barrier (6).

4. the aluminium alloy flexible cable of constructability according to claim 3, is characterized in that: described in several, cavity (61) volume accounts for 30 ~ 45% of described PVC foam insulating barrier (6).

5. the aluminium alloy flexible cable of constructability according to claim 1, is characterized in that: be filled with some PP gasket for packings (11) between described fire-resistant isinglass belt (9) and conductor wire core (8).