Water-blocking fiber resin-based composite core aluminum alloy power cable

Abstract

The utility model discloses a water-blocking type fiber resin-based composite core aluminum alloy power cable, which comprises a fiber resin-based composite core and an aluminum alloy conductor layer formed by twisting a rare earth high-iron aluminum alloy fan-shaped conductor, a semi-conductive nylon water-blocking inner coating layer, an ethylene propylene diene monomer insulating layer, a semi-conductive nylon water-blocking outer coating layer, an aluminum alloy belt wrapping shielding layer, a double-layer polyethylene water-blocking belt wrapping isolating layer and an EVA sheath layer are sequentially wrapped outside the aluminum alloy conductor layer. The double-layer polyethylene water-blocking tape wrapping isolation layer is of a double-layer polyethylene water-blocking tape and aluminum alloy tape reverse spiral covering wrapping structure, the covering rate is not smaller than 25%, and a plurality of longitudinal grooves are evenly distributed in the inner circumferential face of the EVA sheath layer in the circumferential direction. The cable strengthens the water-blocking characteristic, effectively prevents moisture from permeating, corroding and damaging the shielding layer and the insulating layer, is better in laying and installation adaptability in a complex environment, improves the durability, and prolongs the service life.

Description

Technical Field

[0001] The present application belongs to the field of cable technology, and in particular relates to a water-blocking fiber resin-based composite core aluminum alloy power 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, the outer sheath of ordinary cross-linked polyethylene cables often wears and cracks. The damaged parts will be affected by moisture and water will penetrate into the cable. When the cable is installed and bent, gaps will appear in the copper or aluminum shielding layer. Water can easily penetrate from the gaps, which will corrode the shielding layer and damage the insulation layer, reducing the life of the cable and making it less durable. 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 a water-blocking fiber resin-based composite core aluminum alloy power cable, improve the shielding structure, enhance the water-blocking properties, effectively prevent water vapor from penetrating and corroding the shielding layer and the insulation layer, and have better adaptability to laying and installation in complex environments, thereby improving durability and extending service life.

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

[0005] The water-blocking fiber resin-based composite core aluminum alloy power cable comprises a fiber resin-based composite core, two to three layers of rare earth high-iron aluminum alloy fan-shaped conductors are twisted around the outside of the fiber resin-based composite core to form an aluminum alloy conductor layer, the outside of the aluminum alloy conductor layer is sequentially coated with a semi-conductive nylon water-blocking inner coating layer, an EPDM rubber insulation layer, a semi-conductive nylon water-blocking outer coating layer, an aluminum alloy tape wrapped shielding layer, a double-layer polyethylene water-blocking tape wrapped isolation layer and an EVA sheath layer, the aluminum alloy tape wrapped shielding layer is an aluminum alloy tape unidirectional spiral overlapping wrapped structure and The thickness is 0.1mm to 0.15mm, the inner surface of the aluminum alloy belt is provided with a thermoplastic EVA adhesive layer, the double-layer polyethylene water-blocking tape wrapped isolation layer is a double-layer polyethylene water-blocking tape and the aluminum alloy belt that are reversely spirally overlapped and wrapped with each other, and the overlap rate is not less than 25%, the double-layer polyethylene water-blocking tape is formed by co-extrusion of an MDPE water-blocking inner layer and an LDPE water-blocking outer layer, the thickness of the double-layer polyethylene water-blocking tape wrapped isolation layer is 0.2mm to 0.3mm, and a plurality of longitudinal grooves are evenly distributed circumferentially on the inner circumference of the EVA sheath layer.

[0006] Preferably, the fiber resin-based composite core comprises a plurality of glass fiber composite cores twisted together, the glass fiber composite core comprises stainless steel monofilaments, a plurality of glass fiber core materials surround the outside of the stainless steel monofilaments and are hardened by impregnation with epoxy resin to form a composite core body, and the outside of the composite core body is coated with a PET coating layer.

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

[0008] Preferably, the overlap rate of the aluminum alloy strip is not less than 20%.

[0009] Preferably, the width of the aluminum alloy belt is 20 mm to 30 mm.

[0010] Preferably, the thickness of the EPDM rubber insulation layer is 8 mm to 16 mm.

[0011] Preferably, the cross section of the longitudinal groove is semicircular or fan-shaped and has a depth of 0.5 mm to 1 mm.

[0012] Preferably, the EVA sheath layer has a thickness of 2 mm to 5 mm.

[0013] Preferably, the semiconductive nylon water-blocking inner coating layer and the semiconductive nylon water-blocking outer coating layer are both multi-layer overlapping wrapping structures of semiconductive nylon water-blocking resin tape with an overlap rate of 40% to 50%, and the thickness of the semiconductive nylon water-blocking resin tape is 0.4mm to 0.5mm and the belt width is 30mm to 60mm.

[0014] Beneficial effects of this application:

[0015] 1. Adding a semi-conductive nylon water-blocking coating layer on both the inside and outside of the EPDM rubber insulation layer is beneficial to blocking the diffusion of water vapor into the insulation layer, delaying the water tree aging phenomenon of the insulation layer, and having excellent moisture-proof and water-blocking properties, thereby improving durability. Adding a double-layer polyethylene water-blocking tape wrapped isolation layer on the outside of the aluminum alloy tape wrapped shielding layer enhances moisture-proof and water-blocking properties and prevents water vapor from invading from the outside. The isolation layer is flat and compact, and the overlap rate is not less than 25%, which helps to improve flexibility and bending resistance. The double-layer polyethylene water-blocking tape and the aluminum alloy tape are reverse spirally overlapped and wrapped structures, and the inner surface of the aluminum alloy tape is provided with a thermoplastic EVA adhesive layer, which helps to prevent the aluminum alloy tape wrapped shielding layer from loosening and generating gaps, thereby effectively preventing water vapor from penetrating from the gaps, helping to prevent corrosion of the shielding layer and damage to the insulation layer, extending the life of the cable and improving durability.

[0016] 2. By adding longitudinal grooves on the inner circumference of the EVA sheath layer and controlling the depth of the longitudinal grooves to 0.5mm to 1mm, the friction area between the sheath layer and the double-layer polyethylene water-blocking tape wrapped isolation layer is reduced while ensuring the mechanical strength of the sheath layer. While reducing the friction, it helps to improve the flexibility and flexural resistance of the cable, reduce the torque during bending, and protect the sheath layer. The cable has stronger adaptability to laying and installation in complex environments, extends its service life, and has better durability.

[0017] 3. The fiber resin-based aluminum alloy conductor structure formed by the fiber resin-based composite core and the rare earth high-iron aluminum alloy fan-shaped conductor is used to replace the traditional steel core aluminum stranded wire conductor. The mechanical, thermal and electrical properties of the fiber resin-based composite core aluminum stranded wire are better than those of the traditional aluminum stranded wire conductor. It is light in weight and has higher strength. With the same outer diameter as the steel core aluminum stranded wire, it increases the aluminum conductive area and greatly reduces the line loss. Under the same load, it reduces the weight of the stranded wire and the line sag, which is beneficial to reducing the cost of line installation and erection. It has a small linear expansion coefficient and a small curvature in the operating temperature range from the lowest temperature to the highest temperature. It is more corrosion-resistant than the steel core structure, has a longer service life and better durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the present application.

[0019] Description of reference numerals:

[0020] 1-fiber resin based composite core, 2-rare earth high iron aluminum alloy fan-shaped conductor, 3-semi-conductive nylon water-blocking inner coating, 4-EPDM rubber insulation layer, 5-semi-conductive nylon water-blocking outer coating, 6-aluminum alloy tape wrapped shielding layer, 7-double-layer polyethylene water-blocking tape wrapped isolation layer, 8-EVA sheath layer, 9-longitudinal groove, 10-glass fiber composite core, 11-stainless steel monofilament, 12-composite core body, 13-PET coating layer. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0022] See also Figure 1The water-blocking fiber resin-based composite core aluminum alloy power cable of the embodiment of the present application includes a fiber resin-based composite core 1. In the present embodiment, the fiber resin-based composite core 1 includes a plurality of glass fiber composite cores 10 twisted together. The glass fiber composite core 10 includes a stainless steel monofilament 11. A plurality of glass fiber core materials surround the outside of the stainless steel monofilament 11 and are hardened by impregnation with epoxy resin to form a composite core body 12. The composite core body 12 is coated with a PET coating layer 13. Two to three layers of rare earth high-iron aluminum alloy fan-shaped conductors 2 are twisted around the outside of the fiber resin-based composite core 1 to form an aluminum alloy conductor layer. Specifically, the rare earth high-iron aluminum alloy fan-shaped conductor 2 is a plurality of rare earth high-iron aluminum alloy wires twisted and pressed into a fan-shaped conductor structure. The diameter of the rare earth high-iron aluminum alloy wire is 1mm to 3mm.

[0023] The aluminum alloy conductor layer is coated with a semi-conductive nylon water-blocking inner coating layer 3, an EPDM rubber insulation layer 4, a semi-conductive nylon water-blocking outer coating layer 5, an aluminum alloy tape wrapped shielding layer 6, a double-layer polyethylene water-blocking tape wrapped isolation layer 7 and an EVA sheath layer 8 in sequence. In one embodiment, the semi-conductive nylon water-blocking inner coating layer 3 and the semi-conductive nylon water-blocking outer coating layer 5 are both semi-conductive nylon water-blocking resin tape multi-layer overlapping wrapped structures with an overlap rate of 40% to 50%, and the thickness of the semi-conductive nylon water-blocking resin tape is 0.4mm to 0.5mm and the width is 30mm to 60mm. The thickness of the EPDM rubber insulation layer 4 is 8mm to 16mm. The aluminum alloy tape wrapped shielding layer 6 is a unidirectional spiral overlapping wrapped structure of the aluminum alloy tape and has a thickness of 0.1mm to 0.15mm. The inner surface of the aluminum alloy tape is provided with a thermoplastic EVA adhesive layer. Further, the overlap rate of the aluminum alloy tape is not less than 20%, and the width of the aluminum alloy tape is 20mm to 30mm. The double-layer polyethylene water-blocking tape wrapped isolation layer 7 is a double-layer polyethylene water-blocking tape and the aluminum alloy tape are mutually reversely spirally overlapped and wrapped, and the overlap rate is not less than 25%. The double-layer polyethylene water-blocking tape is formed by co-extrusion of the MDPE water-blocking inner layer and the LDPE water-blocking outer layer. The thickness of the double-layer polyethylene water-blocking tape wrapped isolation layer 7 is 0.2mm to 0.3mm. The thickness of the EVA sheath layer 8 is 2mm to 5mm. A number of longitudinal grooves 9 are evenly distributed circumferentially on the inner circumference of the EVA sheath layer 8. Further, the cross-section of the longitudinal grooves 9 is semicircular or fan-shaped and the depth is 0.5mm to 1mm.

[0024] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. Water-blocking fiber resin-based composite core aluminum alloy power cable, characterized by: The invention comprises a fiber resin-based composite core (1), two to three layers of rare earth high iron aluminum alloy fan-shaped conductors (2) are twisted around the outside of the fiber resin-based composite core (1) to form an aluminum alloy conductor layer, the outside of the aluminum alloy conductor layer is sequentially coated with a semi-conductive nylon water-blocking inner coating layer (3), an EPDM rubber insulation layer (4), a semi-conductive nylon water-blocking outer coating layer (5), an aluminum alloy tape wrapped shielding layer (6), a double-layer polyethylene water-blocking tape wrapped isolation layer (7) and an EVA sheath layer (8), the aluminum alloy tape wrapped shielding layer (6) is an aluminum alloy tape unidirectional spiral overlapping wrapped structure and has a thickness of The thickness of the double-layer polyethylene water-blocking tape is 0.1 mm to 0.15 mm, the inner surface of the aluminum alloy tape is provided with a thermoplastic EVA adhesive layer, the double-layer polyethylene water-blocking tape wrapped isolation layer (7) is a double-layer polyethylene water-blocking tape and the aluminum alloy tape are mutually reversely spirally overlapped and the overlap rate is not less than 25%, the double-layer polyethylene water-blocking tape is formed by co-extrusion of an MDPE water-blocking inner layer and an LDPE water-blocking outer layer, the thickness of the double-layer polyethylene water-blocking tape wrapped isolation layer (7) is 0.2 mm to 0.3 mm, and a plurality of longitudinal grooves (9) are evenly distributed circumferentially on the inner circumference of the EVA sheath layer (8).

2. The water-blocking fiber resin-based composite core aluminum alloy power cable according to claim 1 is characterized by: The fiber resin-based composite core (1) comprises a plurality of glass fiber composite cores (10) twisted together, wherein the glass fiber composite core (10) comprises a stainless steel monofilament (11), a plurality of glass fiber core materials surround the outside of the stainless steel monofilament (11) and are hardened by impregnation with epoxy resin to form a composite core body (12), and the composite core body (12) is coated with a PET coating layer (13) on the outside.

3. The water-blocking fiber resin-based composite core aluminum alloy power cable according to claim 1 is characterized by: The rare earth high iron aluminum alloy fan-shaped conductor (2) is a plurality of rare earth high iron aluminum alloy wires twisted and pressed into a fan-shaped conductor structure, and the diameter of the rare earth high iron aluminum alloy wire is 1 mm to 3 mm.

4. The water-blocking fiber resin-based composite core aluminum alloy power cable according to claim 1 is characterized by: The overlapping rate of the aluminum alloy strip is not less than 20%.

5. The water-blocking fiber resin-based composite core aluminum alloy power cable according to claim 1 is characterized by: The width of the aluminum alloy belt is 20 mm to 30 mm.

6. The water-blocking fiber resin-based composite core aluminum alloy power cable according to claim 1 is characterized by: The thickness of the EPDM rubber insulation layer (4) is 8 mm to 16 mm.

7. The water-blocking fiber resin-based composite core aluminum alloy power cable according to claim 1 is characterized by: The cross section of the longitudinal groove (9) is semicircular or fan-shaped and has a depth of 0.5 mm to 1 mm.

8. The water-blocking fiber resin-based composite core aluminum alloy power cable according to claim 1 is characterized by: The EVA sheath layer (8) has a thickness of 2 mm to 5 mm.

9. The water-blocking fiber resin-based composite core aluminum alloy power cable according to claim 1 is characterized by: The semi-conductive nylon water-blocking inner coating layer (3) and the semi-conductive nylon water-blocking outer coating layer (5) are both semi-conductive nylon water-blocking resin tape multi-layer overlapping wrapping structures with an overlap rate of 40% to 50%. The thickness of the semi-conductive nylon water-blocking resin tape is 0.4mm to 0.5mm and the tape width is 30mm to 60mm.

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