Environment-friendly wear-resistant medium-voltage aluminum alloy cable

Abstract

The utility model discloses an environment-friendly wear-resistant medium-voltage aluminum alloy cable, which comprises an inner conductor, a semi-conductive nylon tape inner taped covering, an ethylene propylene diene monomer insulating layer, a semi-conductive nylon tape outer taped covering, a polyester fiber plain woven fabric inner taped covering, a metal shielding layer, a polyester fiber plain woven fabric outer taped covering and an EVA (Ethylene Vinyl Acetate) sheath layer, the inner conductor comprises a galvanized steel strand inner core, two layers of rare earth high-iron aluminum alloy fan-shaped conductors are twisted around the galvanized steel strand inner core to form an aluminum alloy conductor layer, the thickness of the ethylene propylene diene monomer insulating layer is 8-16 mm, the thickness of the EVA sheath layer is 2.5-3 mm and does not exceed one third of the thickness of the ethylene propylene diene monomer insulating layer, and the outer diameter of the EVA sheath layer is 30-60 mm. The aluminum alloy cable has better flexibility, can adapt to a low-temperature working condition environment, is wear-resistant, green and environment-friendly, and does not pollute the natural environment.

Description

Technical Field

[0001] The present application relates to the field of cable technology, and in particular to an environmentally friendly, wear-resistant medium-voltage aluminum alloy cable. Background Art

[0002] Medium voltage power cables transmit electric energy for power transmission and distribution systems. They are lightweight and moisture-resistant and can be laid indoors and outdoors, in direct burial, bridges, pipes, brackets, cable trenches and other environments. Although cross-linked polyethylene power cables are widely used due to their simple manufacturing and safety processes, the linear expansion coefficients of the insulation layer and the outer sheath of ordinary cross-linked polyethylene cable products are quite different. In the production process, there will be gaps between the layers, which can easily cause the outer sheath to shift and reduce the electrical properties of the cable. In addition, ordinary cross-linked polyethylene cables have poor flexibility in outdoor low-temperature environments, making it difficult to lay and distribute wires, and the outer skin is often worn and cracked. With the development trend of high-quality and efficient production and manufacturing of power cable products, while meeting the excellent production process of power cables, it is necessary to ensure the flexibility and wear resistance of power cables at low temperatures, and also to consider green and environmentally friendly cable design, so that the discarded cables can be recycled and not pollute the natural environment. Utility Model Content

[0003] In view of the deficiencies in the prior art, the technical problem to be solved by the present application is to provide an environmentally friendly, wear-resistant medium-voltage aluminum alloy cable which has better flexibility, suppresses interlayer gaps, prevents sheath displacement, can adapt to low-temperature working conditions, is wear-resistant, has better adaptability to laying and installation in complex environments, is green and environmentally friendly, and does not pollute the natural environment.

[0004] This application solves the above technical problems through the following technical solutions.

[0005] The environmentally friendly and wear-resistant medium-voltage aluminum alloy cable comprises an inner conductor and a semi-conductive nylon tape inner sheath, an EPDM rubber insulation layer, a semi-conductive nylon tape outer sheath, a polyester fiber plain woven cloth inner sheath, a metal shielding layer, a polyester fiber plain woven cloth outer sheath and an EVA sheath layer which are sequentially wrapped around the outside of the inner conductor. The inner conductor comprises a galvanized steel stranded wire inner core, and two layers of rare earth high-iron aluminum alloy fan-shaped conductors are twisted around the outside of the galvanized steel stranded wire inner core to form an aluminum alloy conductor layer. The metal shielding layer is formed by spirally winding tinned copper wire with a wire diameter of 0.4mm to 0.6mm. The thickness of the EPDM rubber insulation layer is 8mm to 16mm, the thickness of the EVA sheath layer is 2.5mm to 3mm and does not exceed one third of the thickness of the EPDM rubber insulation layer, and the outer diameter of the EVA sheath layer is 30mm to 60mm.

[0006] Preferably, the rare earth high iron aluminum alloy fan-shaped conductor is a plurality of rare earth high iron aluminum alloy wires twisted and pressed into a fan-shaped conductor structure.

[0007] Preferably, the diameter of the rare earth high iron aluminum alloy wire is 1 mm to 3 mm.

[0008] Preferably, the inner core of the galvanized steel strand is composed of a plurality of galvanized steel wires with a wire diameter of 0.5 mm to 2 mm.

[0009] Preferably, the inner and outer layers of the semi-conductive nylon tape are both multi-layer overlapping structures of the semi-conductive nylon tape with an overlap rate of 40% to 50%, the thickness of the semi-conductive nylon tape is 0.4 mm to 0.5 mm, and the width of the semi-conductive nylon tape is 30 mm to 60 mm.

[0010] Preferably, the thickness of the metal shielding layer is 0.8 mm to 1 mm.

[0011] Preferably, the inner wrapping layer of the polyester fiber plain woven fabric is a polyester fiber plain woven fabric overlapping wrapping structure with an overlap rate of 25% to 50%, and the polyester fiber plain woven fabric has a thickness of 0.1 mm to 0.4 mm and a width of 30 mm to 70 mm.

[0012] Preferably, the outer wrapping layer of the polyester fiber plain woven fabric is a polyester fiber plain woven fabric overlapping wrapping structure with an overlap rate of 40% to 50%, and the polyester fiber plain woven fabric has a thickness of 0.05mm to 0.2mm and a width of 50mm to 90mm.

[0013] Preferably, the winding direction of the inner wrapping layer of the polyester fiber plain woven fabric is opposite to the winding direction of the outer wrapping layer of the polyester fiber plain woven fabric.

[0014] Preferably, the thickness of the inner semi-conductive nylon tape layer and the outer semi-conductive nylon tape layer are both 1 mm.

[0015] Beneficial effects of this application:

[0016] 1. By adopting EPDM rubber insulation layer and EVA sheath layer, the thickness of EVA sheath layer is optimized to 2.5mm to 3mm and not more than one third of the thickness of EPDM rubber insulation layer. The linear expansion coefficient ratio of insulation layer and sheath layer is 1.3. The production process effectively suppresses the appearance of gaps between insulation layer and sheath layer. The cable has better flexibility and can be laid and installed under low temperature conditions. The EVA sheath layer has excellent wear resistance, which effectively prevents the cable sheath from wear and cracking, and has stronger adaptability to laying and installation in complex environments.

[0017] 2. By adding inner and outer wrapping layers of polyester fiber plain woven fabric to the inner and outer layers of the metal shielding layer, it is beneficial to enhance the flexibility of the cable, reduce the stress concentration of the shielding layer when subjected to bending, and reduce the occurrence of wire breakage in the metal shielding layer. The thickness and width of the inner and outer wrapping layers of the polyester fiber plain woven fabric are optimized to be different, which is beneficial to the formation of slippage between the inner and outer wrapping layers and the shielding layer, reducing torque and reducing local stress concentration in the shielding layer. The cable has better flexibility and bending resistance, ensuring the excellent electrical properties of the cable.

[0018] 3. The cable is designed to be green and environmentally friendly. The materials of each layer of the cable meet the EU "ROHS Directive" and the requirements of environmentally friendly cables. It does not contain substances harmful to human health. The cable does not release smoke or toxic gases in the burning flame. The discarded cables can be recycled and reused, which is pollution-free and beneficial to environmental protection and renewable treatment.

[0019] 4. The linear expansion coefficient of the galvanized steel wire core located at the center of the inner conductor is smaller than that of the two layers of rare earth high iron aluminum alloy fan-shaped conductors, which is beneficial to balance the absorption of the cable extension and suppress the extension force at the cable end. The tensile strength of the galvanized steel wire is greater than that of the rare earth high iron aluminum alloy wire, which helps to suppress wire breakage and improve the mechanical strength, tensile resistance and bending resistance of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the present application.

[0021] Description of reference numerals:

[0022] 1-inner conductor, 2-semi-conductive nylon tape inner sheath, 3-EPDM rubber insulation layer, 4-semi-conductive nylon tape outer sheath, 5-polyester fiber plain woven cloth inner sheath, 6-metal shielding layer, 7-polyester fiber plain woven cloth outer sheath, 8-EVA sheath layer, 9-galvanized steel stranded wire inner core, 10-rare earth high-iron aluminum alloy fan-shaped conductor. DETAILED DESCRIPTION

[0023] The terms used in the implementation method part of this application are only used to explain the specific embodiments of this application, and are not intended to limit this application. The implementation method of the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0024] See also Figure 1The environmentally friendly and wear-resistant medium-voltage aluminum alloy cable of the embodiment of the present application includes an inner conductor 1, and the inner conductor 1 includes a galvanized steel stranded wire inner core 9. Further, the galvanized steel stranded wire inner core 9 is composed of a plurality of galvanized steel wires with a wire diameter of 0.5 mm to 2 mm. Two layers of rare earth high-iron aluminum alloy fan-shaped conductors 10 are twisted around the outside of the galvanized steel stranded wire inner core 9 to form an aluminum alloy conductor layer. Specifically, the rare earth high-iron aluminum alloy fan-shaped conductor 10 is a plurality of rare earth high-iron aluminum alloy wires twisted and pressed into a fan-shaped conductor structure. Further, the diameter of the rare earth high-iron aluminum alloy wire is 1 mm to 3 mm.

[0025] The outer part of the inner conductor 1 is sequentially coated with a semi-conductive nylon tape inner wrapping layer 2, an EPDM rubber insulation layer 3, a semi-conductive nylon tape outer wrapping layer 4, a polyester fiber plain woven fabric inner wrapping layer 5, a metal shielding layer 6, a polyester fiber plain woven fabric outer wrapping layer 7 and an EVA sheath layer 8. Specifically, the semi-conductive nylon tape inner wrapping layer 2 and the semi-conductive nylon tape outer wrapping layer 4 are both semi-conductive nylon tape multi-layer overlapping wrapping structures with an overlap rate of 40% to 50%, a semi-conductive nylon tape thickness of 0.4mm to 0.5mm, and a semi-conductive nylon tape width of 30mm to 60mm. The semi-conductive nylon tape inner wrapping layer 2 and the semi-conductive nylon tape outer wrapping layer 4 are both 1mm thick. The metal shielding layer 6 is formed by spirally winding tinned copper wire with a wire diameter of 0.4mm to 0.6mm. Further, the metal shielding layer 6 has a thickness of 0.8mm to 1mm. In one embodiment, the inner polyester fiber woven fabric wrapping layer 5 is a polyester fiber woven fabric overlap wrapping structure with an overlap rate of 25% to 50%, the polyester fiber woven fabric has a thickness of 0.1mm to 0.4mm and a width of 30mm to 70mm, the outer polyester fiber woven fabric wrapping layer 7 is a polyester fiber woven fabric overlap wrapping structure with an overlap rate of 40% to 50%, the polyester fiber woven fabric has a thickness of 0.05mm to 0.2mm and a width of 50mm to 90mm, and further, the inner polyester fiber woven fabric wrapping layer 5 is wound in the opposite direction to the outer polyester fiber woven fabric wrapping layer 7. The EPDM rubber insulation layer 3 has a thickness of 8mm to 16mm, the EVA sheath layer 8 has a thickness of 2.5mm to 3mm and does not exceed one third of the thickness of the EPDM rubber insulation layer 3, and the outer diameter of the EVA sheath layer 8 is 30mm to 60mm.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the embodiments of the present application have been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. Environmentally friendly and wear-resistant medium-voltage aluminum alloy cable, its characteristics are: The invention comprises an inner conductor (1) and a semi-conductive nylon tape inner sheath (2), an EPDM rubber insulation layer (3), a semi-conductive nylon tape outer sheath (4), a polyester fiber plain woven fabric inner sheath (5), a metal shielding layer (6), a polyester fiber plain woven fabric outer sheath (7) and an EVA sheath layer (8) which are sequentially coated on the outside of the inner conductor (1), wherein the inner conductor (1) comprises a galvanized steel stranded wire inner core (9), two layers of rare earth high iron aluminum alloy fan-shaped conductors (10) surround the inner conductor (1). The inner core (9) of the galvanized steel stranded wire is twisted externally to form an aluminum alloy conductor layer, the metal shielding layer (6) is formed by spirally winding tinned copper wire with a wire diameter of 0.4 mm to 0.6 mm, the thickness of the EPDM rubber insulation layer (3) is 8 mm to 16 mm, the thickness of the EVA sheath layer (8) is 2.5 mm to 3 mm and does not exceed one third of the thickness of the EPDM rubber insulation layer (3), and the outer diameter of the EVA sheath layer (8) is 30 mm to 60 mm.

2. The environmentally friendly and wear-resistant medium-voltage aluminum alloy cable according to claim 1 is characterized by: The rare earth high iron aluminum alloy fan-shaped conductor (10) is a plurality of rare earth high iron aluminum alloy wires twisted and pressed into a fan-shaped conductor structure.

3. The environmentally friendly and wear-resistant medium-voltage aluminum alloy cable according to claim 2 is characterized by: The diameter of rare earth high iron aluminum alloy wire is 1mm to 3mm.

4. The environmentally friendly and wear-resistant medium-voltage aluminum alloy cable according to claim 1 is characterized by: The inner core (9) of the galvanized steel strand is composed of a plurality of galvanized steel wires with a wire diameter of 0.5 mm to 2 mm.

5. The environmentally friendly and wear-resistant medium-voltage aluminum alloy cable according to claim 1 is characterized by: The inner semi-conductive nylon tape wrapping layer (2) and the outer semi-conductive nylon tape wrapping layer (4) are both semi-conductive nylon tape multi-layer overlapping wrapping structures with an overlap rate of 40% to 50%, a thickness of 0.4 mm to 0.5 mm, and a width of 30 mm to 60 mm.

6. The environmentally friendly and wear-resistant medium-voltage aluminum alloy cable according to claim 1 is characterized by: The thickness of the metal shielding layer (6) is 0.8 mm to 1 mm.

7. The environmentally friendly and wear-resistant medium-voltage aluminum alloy cable according to claim 1 is characterized by: The inner wrapping layer (5) of the polyester fiber plain woven fabric is a polyester fiber plain woven fabric overlapping wrapping structure with an overlapping rate of 25% to 50%. The polyester fiber plain woven fabric has a thickness of 0.1 mm to 0.4 mm and a width of 30 mm to 70 mm.

8. The environmentally friendly and wear-resistant medium-voltage aluminum alloy cable according to claim 1 is characterized by: The outer wrapping layer (7) of the polyester fiber plain woven fabric is a polyester fiber plain woven fabric overlapping wrapping structure with an overlapping rate of 40% to 50%. The polyester fiber plain woven fabric has a thickness of 0.05 mm to 0.2 mm and a width of 50 mm to 90 mm.

9. The environmentally friendly and wear-resistant medium-voltage aluminum alloy cable according to claim 1 is characterized by: The winding direction of the inner polyester fiber plain woven fabric layer (5) is opposite to the winding direction of the outer polyester fiber plain woven fabric layer (7).

10. The environmentally friendly and wear-resistant medium-voltage aluminum alloy cable according to claim 1 is characterized by: The thickness of the inner semi-conductive nylon tape wrapping layer (2) and the outer semi-conductive nylon tape wrapping layer (4) are both 1 mm.

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