Coaxial low-voltage cable

Abstract

A coaxial low-voltage cable is integrally of a flat structure and comprises two insulating wire cores, each insulating wire core is composed of an aluminum alloy conductor and an insulating layer wrapping the aluminum alloy conductor, the two insulating wire cores are arranged in a contact mode, the central axes of the two insulating wire cores are parallel, and an extruded inner protection layer is arranged outside the two insulating wire cores. An armor layer, a belting layer and an outer protective layer are sequentially arranged outside the extruded inner protective layer, the armor layer is aluminum alloy wires uniformly and sparsely wound on the outer surface of the extruded inner protective layer, and the belting layer is a glass fiber flame-retardant belt. According to the cable, the product performance is improved, copper materials are saved, and good economic and social benefits are obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables, in particular to a coaxial low-voltage cable. Background Art

[0002] Most of the household lines in rural areas and some urban villages in China use multiple single-core wires or multi-core bundled wire products, which are generally fixed on the outside of the building wall and connected to each household's meter box or directly into the house. For this type of product, the cable insulation layer uses ordinary XLPE material or PVC material, which is not flame retardant, and the exposed cables are easily stolen, resulting in increased rewiring costs; at the same time, there are also defects such as being environmentally unfriendly, not corrosion-resistant, and aging quickly, which greatly shortens the product life. Utility Model Content

[0003] Based on the problems existing in the design and use of the above-mentioned traditional products, the utility model provides a coaxial low-voltage cable, which has the characteristics of flame retardancy, corrosion resistance, aging resistance and anti-theft, and can well replace traditional cable products.

[0004] The utility model adopts the following technical scheme to achieve the above-mentioned purpose: a coaxial low-voltage cable, which has a flat structure as a whole. The cable includes two insulating cores, which are composed of an aluminum alloy conductor and an insulating layer wrapped around the aluminum alloy conductor. The two insulating cores are arranged in contact with each other and their central axes are arranged in parallel. An extruded inner sheath is arranged outside the two insulating cores, and an armor layer, a tape layer and an outer sheath are arranged outside the extruded inner sheath in sequence. The armor layer is an aluminum alloy wire evenly and sparsely wound on the outer surface of the extruded inner sheath, and the tape layer is a glass fiber flame retardant tape.

[0005] The armor layer uses sparsely wound 8-series aluminum alloy wire that can be used as a ground wire and also for anti-theft purposes. The aluminum alloy wire is conductive when energized, which can effectively prevent theft and eliminate the problems of traditional cable structures that are not flame retardant and not anti-theft.

[0006] In the utility model, the wrapping tape layer is in a double-layer structure and is overlapped and wrapped around the outer surface of the aluminum alloy wire of the armor layer.

[0007] The thickness of each tape layer is ≥0.2mm, and the overlapping rate of the overlapping wrapping is ≥20%.

[0008] In the utility model, the aluminum alloy conductor is formed by compacting aluminum alloy wires.

[0009] In the utility model, the nominal cross-sectional area of ​​the aluminum alloy conductor is consistent with the total cross-sectional area of ​​the aluminum alloy wires of the armor layer.

[0010] In the utility model, the material of the insulating layer is 125° C. irradiation cross-linked low-smoke halogen-free flame-retardant polyolefin insulating material.

[0011] In the utility model, the material of the outer sheath is 125°C irradiation cross-linked low-smoke halogen-free flame-retardant polyolefin sheath material.

[0012] In the utility model, the material of the extruded inner protective layer is a low-smoke, halogen-free, flame-retardant polyolefin oxygen barrier material with an oxygen index of ≥40.

[0013] In the utility model, the cable has three equal cores with the same cross section, two aluminum alloy conductor cores are arranged in parallel, and the other core is used as armor and anti-theft layer and is evenly and sparsely arranged on the surface of the inner sheath.

[0014] In the utility model, the cable has a flat structure, and two insulating wire cores are arranged side by side.

[0015] In the utility model, the material of the extruded inner sheath is a low-smoke halogen-free flame-retardant polyolefin oxygen barrier material with an oxygen index ≥ 40, which is environmentally friendly, halogen-free, non-toxic and flame-retardant, has a long service life, the cable will not age and crack, is resistant to acid and alkali corrosion, and is resistant to ultraviolet rays, and has excellent flame retardant properties.

[0016] Among them, the aluminum alloy conductor and armor layer are both made of 8000 series aluminum alloy wire.

[0017] The cable of the utility model does not need to be filled, and the inner sheath is extruded onto the surface of the insulating core and filled into the gaps in the extruded inner sheath.

[0018] This cable is suitable for voltage 0.6 / 1kV and below.

[0019] The vertical combustion of a single cable complies with the carbonization height and the test paper that dripping does not ignite as specified in the GB / T19666-2019 standard. The bundled combustion test meets the bundled flame retardant Class A, in which the thermal extension of the insulation and sheath is controlled at 30%~80%; the thermal shrinkage is ≤4%.

[0020] The cable improves product performance, saves copper, and achieves good economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional schematic diagram of the utility model.

[0022] Figure numerals: 1. aluminum alloy conductor, 2. insulation layer, 3. extruded inner sheath, 4. armor layer, 5. tape layer, 6. outer sheath. DETAILED DESCRIPTION

[0023] To make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments.

[0024] A coaxial low voltage cable, such as Figure 1As shown, the cable has a flat structure as a whole. The cable includes two insulating cores. The insulating cores are composed of an aluminum alloy conductor 1 and an insulating layer 2 wrapped around the aluminum alloy conductor 1. The aluminum alloy conductor 1 is formed by twisting aluminum alloy wires.

[0025] The two insulating wire cores are arranged in contact with each other and their central axes are arranged in parallel. An extruded inner protective layer 3 is arranged outside the two insulating wire cores. An armor layer 4, a tape layer 5 and an outer protective layer 6 are arranged outside the extruded inner protective layer 3 in sequence.

[0026] The armor layer 4 is aluminum alloy wire evenly and sparsely wound on the outer surface of the extruded inner protective layer, and the elongation of the sparsely wound aluminum alloy single wire is ≥12%, and the tensile strength is ≥80MPa.

[0027] The tape layer 5 is a glass fiber flame retardant tape, and has a double-layer structure and is overlapped and wrapped around the outer surface of the aluminum alloy wire of the armor layer 4. The thickness of each layer of the tape layer 5 is ≥0.2 mm, and the overlap rate of the overlapped wrapping is ≥20%.

[0028] The nominal cross-sectional area of ​​the aluminum alloy conductor 1 is consistent with the total cross-sectional area of ​​the aluminum alloy wires of the armor layer 4 .

[0029] The material of the insulation layer 2 is 125℃ irradiation cross-linked low-smoke halogen-free flame-retardant polyolefin insulation material; the material of the outer sheath 6 is 125℃ irradiation cross-linked low-smoke halogen-free flame-retardant polyolefin sheath material; the material of the extruded inner sheath 3 is low-smoke halogen-free flame-retardant polyolefin oxygen barrier material with an oxygen index ≥ 40, all of which are currently available commercially. The cable conductor is made of 8000 series aluminum alloy rods with relatively abundant resources, and the insulation and outer sheath are made of irradiation cross-linked halogen-free low-smoke flame-retardant polyolefin plastic. The inner sheath is made of low-smoke halogen-free flame-retardant oxygen barrier material with a high oxygen index. It is environmentally friendly, halogen-free, non-toxic and flame-retardant, has a long service life, and the cable will not age and crack. It is resistant to acid and alkali corrosion and ultraviolet rays, and has excellent flame retardant properties. The sparsely wound aluminum alloy gold wire can effectively prevent theft when it is powered on.

[0030] The cable's periphery is made of sparsely wound 8-series alloy wire that can be used as a ground wire and also for theft prevention, which greatly improves product performance and achieves good economic and social benefits.

Claims

1. A coaxial low-voltage cable, characterized in that: The cable has a flat structure as a whole. The cable includes two insulating cores, which are composed of an aluminum alloy conductor and an insulating layer wrapped around the aluminum alloy conductor. The two insulating cores are arranged in contact with each other and their central axes are arranged in parallel. An extruded inner sheath is provided outside the two insulating cores, and an armor layer, a tape layer and an outer sheath are arranged outside the extruded inner sheath in sequence. The armor layer is an aluminum alloy wire evenly and sparsely wound on the outer surface of the extruded inner sheath, and the tape layer is a glass fiber flame retardant tape.

2. A coaxial low-voltage cable as claimed in claim 1, characterized in that: The tape layer has a double-layer structure and is overlapped and wrapped around the outer surface of the aluminum alloy wire of the armor layer.

3. A coaxial low-voltage cable as claimed in claim 2, characterized in that: The thickness of each tape layer is ≥0.2mm, and the overlapping rate of overlapping wrapping is ≥20%.

4. A coaxial low-voltage cable as claimed in claim 1, characterized in that: Aluminum alloy conductors are made of compacted aluminum alloy wires.

5. A coaxial low-voltage cable as claimed in claim 4, characterized in that: The nominal cross-sectional area of ​​the aluminum alloy conductor is consistent with the total cross-sectional area of ​​the aluminum alloy wires of the armor layer.

6. A coaxial low-voltage cable as claimed in claim 1, characterized in that: The material of the insulation layer is 125℃ irradiation cross-linked low-smoke halogen-free flame-retardant polyolefin insulation material.

7. A coaxial low-voltage cable as claimed in claim 1, characterized in that: The material of the outer sheath is 125℃ irradiation cross-linked low-smoke halogen-free flame-retardant polyolefin sheath material.

8. A coaxial low-voltage cable as claimed in claim 1, characterized in that: The material of the extruded inner protective layer is a low-smoke, halogen-free, flame-retardant polyolefin oxygen barrier material with an oxygen index of ≥40.

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