Warp-resistant polyethylene insulated cable

Abstract

The utility model discloses a warp-resistant polyethylene insulated cable, which comprises a cable core, the cable core comprises a wire core and a filling layer, a mica tape wrapping layer is arranged outside the cable core, a warp-resistant layer is arranged outside the mica tape wrapping layer, the warp-resistant layer is attached to the mica tape wrapping layer, and the filling layer is arranged outside the mica tape wrapping layer. An inner composite protection layer is arranged outside the twist-resistant layer, the inner composite protection layer is attached to the twist-resistant layer, an armor layer is arranged outside the inner composite protection layer, the armor layer is attached to the inner composite protection layer, an outer sheath is arranged outside the armor layer, the outer sheath and the armor layer are formed through extrusion, and the outer sheath is arranged outside the armor layer. According to the cable, the torsion-resistant layer is arranged between the mica tape wrapping layer and the inner composite protection layer, the flexibility and the bending performance of the cable are improved through the torsion-resistant layer, the extra bending radius can be provided, the cable is more flexible and durable when bent, too large stress cannot be caused to the inner wires and the insulating layers, and the service life of the cable is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, specifically to a torsion-resistant polyethylene insulated cable. Background Technology

[0002] A cable is a conductor consisting of one or more mutually insulated conductors and an outer insulating protective layer. It is laid underground, in the air, etc., and generally consists of three parts: the conductor, the insulation layer, and the protective layer. There are usually two types: power cables and control cables. Power cables are mainly used for the transmission and distribution of electrical energy; control cables are mainly used for measurement, protection, and control lines. Insulated cables are a common type of cable. They are electrical transmission lines mainly used in power systems and electrical equipment. Polyethylene, due to its excellent physical and mechanical properties, high heat resistance, excellent electrical insulation, and chemical stability, is often used to manufacture the insulation layer of various wires and cables.

[0003] Chinese Patent Publication No. CN214624496U, authorized on November 5, 2021, discloses a torsion-resistant, water-blocking insulated cable. The cable core comprises four power cores and four polyethylene resin core rods twisted together. The total cross-sectional area of ​​the four power cores is 50% to 65% of the total cross-sectional area of ​​the cable core. The cable core is sequentially covered with a silane-grafted cross-linked low-density polyethylene insulation layer, a butyl rubber moisture-proof layer, a polypropylene moisture-absorbing layer, and a CPE outer sheath. Each power core consists of four strands twisted together to form a core body, which is covered with a PET wrapping tape layer. The strands are composed of several tinned copper monofilaments twisted together, with a diameter of 0.02mm to 0.05mm. This cable effectively reduces friction between the conductor copper wires, exhibits better flexibility and torsion resistance, effectively prevents conductor breakage, has excellent waterproof and moisture-proof performance, delays water treeing aging, and provides excellent insulation, thus improving the safety and reliability of the cable.

[0004] The inner conductor of existing cables is generally made of concentric strands of copper wire. The mechanical properties of each wire core are insufficient. After being subjected to different degrees of twisting and bending, the outer sheath of the wire core is prone to breakage. In addition, the simple internal structure of the cable results in poor fire resistance and poor performance in high-temperature environments, which cannot meet the usage requirements. Utility Model Content

[0005] The purpose of this utility model is to provide a torsion-resistant polyethylene insulated cable to solve the problems mentioned in the background art, which are that the inner conductor of existing cables is generally made of concentric strands of copper wire, each core has insufficient mechanical properties, the outer sheath of the core is prone to breakage after being subjected to different degrees of torsion and bending, and the simple internal structure of the cable results in poor fire resistance and poor performance in high-temperature environments, thus failing to meet the usage requirements.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a torsion-resistant polyethylene insulated cable, comprising a cable core, the cable core including a conductor and a filler layer, a mica tape wrapping layer outside the cable core, a torsion-resistant layer outside the mica tape wrapping layer, the torsion-resistant layer being bonded to the mica tape wrapping layer, an inner composite protective layer outside the torsion-resistant layer, the inner composite protective layer being bonded to the torsion-resistant layer, an armor layer outside the inner composite protective layer, the armor layer being bonded to the inner composite protective layer, and an outer sheath outside the armor layer, the outer sheath being formed by extrusion between the outer sheath and the armor layer.

[0007] Preferably, the wire core includes a conductor, an insulation layer, a shielding layer, and a flexible metal sleeve. The conductor is made of multiple stranded copper wires. The insulation layer is disposed outside the conductor, and the shielding layer is disposed outside the insulation layer. The insulation layer and the shielding layer are sequentially extruded outside the conductor. The flexible metal sleeve is disposed outside the shielding layer and is attached to the shielding layer.

[0008] Preferably, the filling layer is disposed at the gap between multiple wire cores, and the cross-sections of both the cable core and the wire core are circular. The mica tape wrapping layer is spirally wound around the outside of the cable core, and the winding direction is opposite to the twisting direction.

[0009] Preferably, the torsion-resistant layer comprises metal wires and nylon wires, with at least six of each type. The metal wires are equidistantly arranged outside the mica tape wrapping layer along the direction of the wire core, and the metal wires and nylon wires are staggered and interwoven into a mesh.

[0010] Preferably, the inner composite protective layer includes a fire-resistant layer, a flame-retardant layer, and a heat-insulating layer. The flame-retardant layer is disposed outside the heat-insulating layer, and the fire-resistant layer is disposed outside the flame-retardant layer. The fire-resistant layer, the flame-retardant layer, and the heat-insulating layer are pressed together as a single unit.

[0011] Preferably, the outer sheath is provided with a waterproof coating, and the waterproof coating is integrally coated with the outer sheath.

[0012] Preferably, the waterproof coating is provided with an anti-corrosion coating on the outside, and the anti-corrosion coating and the waterproof coating are applied as a single unit.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This utility model device incorporates a torsion-resistant layer, an armor layer, and a flexible metal sheath. The torsion-resistant layer and armor layer increase the structural strength of the cable core, while the metal wires and nylon filaments are woven into a mesh structure to increase the cable's flexibility and bending performance. This provides an additional bending radius, making the cable more flexible and durable when bent, without causing excessive stress to the internal conductors and insulation layers. The flexible metal sheath increases the mechanical strength of each conductor, enabling it to resist deformation and breakage when the cable is subjected to torsional forces, thus maintaining its structural integrity and performance stability.

[0015] This utility model device incorporates a fire-resistant layer, a flame-retardant layer, and a heat insulation layer. The flame-retardant layer uses ceramicized silicone rubber, which has excellent fireproof, flame-retardant, low-smoke, and non-toxic properties. Its residue after combustion is a hard ceramicized shell, which can effectively prevent the spread of flames. The heat insulation layer uses glass fiber, which has high strength and good heat insulation effect. It plays a role in heat insulation protection for the inside of the cable in high-temperature environments, greatly improving the fire resistance of the cable.

[0016] This utility model device incorporates a waterproof coating and an anti-corrosion coating. The waterproof coating uses epoxy resin, which has excellent adhesion and corrosion resistance. After curing, it forms a hard coating that effectively prevents moisture penetration. The anti-corrosion coating uses polyurethane, which has oil resistance, wear resistance, cold resistance, water resistance, aging resistance, and weather resistance, greatly improving the service life of the cable's outer protective structure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the wire core of this utility model;

[0019] Figure 3 This is a structural diagram of the torsion-resistant layer of this utility model;

[0020] Figure 4 This is a structural diagram of the inner composite protective layer of this utility model;

[0021] Figure 5 This is a structural diagram of the outer sheath of this utility model.

[0022] In the diagram: 1. Cable core; 2. Wire core; 3. Filler layer; 4. Mica tape wrapping layer; 5. Torsion-resistant layer; 6. Inner composite protective layer; 7. Armor layer; 8. Outer sheath; 9. Conductor; 10. Insulation layer; 11. Shielding layer; 12. Flexible metal sheath; 13. Metal wire; 14. Nylon wire; 15. Fire-resistant layer; 16. Flame-retardant layer; 17. Heat insulation layer; 18. Waterproof coating; 19. Anti-corrosion coating. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Please see Figure 1-5 This utility model provides an embodiment of a torsion-resistant polyethylene insulated cable, comprising a cable core 1, the cable core 1 including a conductor 2 and a filling layer 3, a mica tape wrapping layer 4 externally disposed on the cable core 1, a torsion-resistant layer 5 externally disposed on the mica tape wrapping layer 4, and the torsion-resistant layer 5 being bonded to the mica tape wrapping layer 4, an inner composite protective layer 6 externally disposed on the torsion-resistant layer 5, and the inner composite protective layer 6 being bonded to the torsion-resistant layer 5, an armor layer 7 externally disposed on the inner composite protective layer 6, and the armor layer 7 being bonded to the inner composite protective layer 6, and an outer sheath 8 externally disposed on the armor layer 7, the outer sheath 8 being formed by extrusion with the armor layer 7, the conductor 2 including a conductor 9, an insulation layer 10, a shielding layer 11 and a flexible metal sheath 12, and the conductor 9... The conductor 9 is made of multiple stranded copper wires. The insulation layer 10 is placed outside the conductor 9, and the shielding layer 11 is placed outside the insulation layer 10. The insulation layer 10 and the shielding layer 11 are extruded sequentially outside the conductor 9. The flexible metal sleeve 12 is placed outside the shielding layer 11 and is in close contact with the shielding layer 11. The filling layer 3 is placed in the gaps between multiple cores 2. The cross-sections of the cable core 1 and the core 2 are both circular. The mica tape wrapping layer 4 is spirally wound around the outside of the cable core 1, and the winding direction is opposite to the stranding direction. The flexible metal sleeve 12 increases the mechanical strength of each core 2. When the cable is subjected to torsional force, it can resist deformation and breakage damage and maintain its structural integrity and performance stability.

[0025] Please see Figure 1 and Figure 3 The torsion-resistant layer 5 includes metal wires 13 and nylon wires 14. At least six metal wires 13 and nylon wires 14 are provided. The metal wires 13 are equidistantly arranged outside the mica tape wrapping layer 4 along the direction of the wire core 2. The metal wires 13 and nylon wires 14 are staggered and interwoven into a mesh. The mesh structure of the metal wires 13 and nylon wires 14 can increase the flexibility of the cable, prevent breakage when the cable is bent, and improve the torsion resistance of the cable.

[0026] Please see Figure 1 and Figure 4The inner composite protective layer 6 includes a fire-resistant layer 15, a flame-retardant layer 16, and a heat insulation layer 17. The flame-retardant layer 16 is placed outside the heat insulation layer 17, and the fire-resistant layer 15 is placed outside the flame-retardant layer 16. The fire-resistant layer 15, the flame-retardant layer 16, and the heat insulation layer 17 are pressed together as one piece. The fire-resistant layer 15 is made of inorganic mineral materials. The inorganic minerals themselves will not cause fires, nor can they burn or support combustion. Moreover, the inorganic minerals have a very high melting point and can remain at high temperatures for a long time. The flame-retardant layer 16 is made of ceramicized silicone rubber, which has excellent fireproof, flame-retardant, low-smoke, and non-toxic properties. Its residue after combustion is a hard ceramicized shell, which can effectively prevent the spread of flames. The heat insulation layer 17 is made of glass fiber, which has high strength and good heat insulation effect, and plays a role in heat insulation protection for the inside of the cable in high-temperature environments.

[0027] Please see Figure 1 and Figure 5 The outer sheath 8 is provided with a waterproof coating 18, and the waterproof coating 18 is coated integrally with the outer sheath 8. The waterproof coating 18 is provided with an anti-corrosion coating 19, and the anti-corrosion coating 19 is coated integrally with the waterproof coating 18. The waterproof coating 18 is made of epoxy resin, which has excellent adhesion and corrosion resistance. After curing, it forms a hard coating that can effectively prevent moisture penetration. The anti-corrosion coating 19 is made of polyurethane, which has oil resistance, wear resistance, cold resistance, water resistance, aging resistance, and weather resistance.

[0028] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A torsion-resistant polyethylene insulated cable, comprising a cable core (1), characterized in that: The cable core (1) includes a wire core (2) and a filling layer (3). A mica tape wrapping layer (4) is provided on the outside of the cable core (1). A torsion-resistant layer (5) is provided on the outside of the mica tape wrapping layer (4), and the torsion-resistant layer (5) is attached to the mica tape wrapping layer (4). An inner composite protective layer (6) is provided on the outside of the torsion-resistant layer (5), and the inner composite protective layer (6) is attached to the torsion-resistant layer (5). An armor layer (7) is provided on the outside of the inner composite protective layer (6), and the armor layer (7) is attached to the inner composite protective layer (6). An outer sheath (8) is provided on the outside of the armor layer (7), and the outer sheath (8) and the armor layer (7) are formed by extrusion.

2. The torsion-resistant polyethylene insulated cable according to claim 1, characterized in that: The core (2) includes a conductor (9), an insulation layer (10), a shielding layer (11), and a flexible metal sleeve (12). The conductor (9) is made of multiple copper wires twisted together. The insulation layer (10) is disposed outside the conductor (9). The shielding layer (11) is disposed outside the insulation layer (10). The insulation layer (10) and the shielding layer (11) are formed by extrusion on the outside of the conductor (9). The flexible metal sleeve (12) is disposed outside the shielding layer (11) and is attached to the shielding layer (11).

3. The torsion-resistant polyethylene insulated cable according to claim 1, characterized in that: The filling layer (3) is set in the gap between multiple wire cores (2), and the cross sections of the cable core (1) and the wire core (2) are both circular. The mica tape wrapping layer (4) is spirally wound around the outside of the cable core (1), and the winding direction is opposite to the twisting direction.

4. A torsion-resistant polyethylene insulated cable according to claim 1, characterized in that: The torsion-resistant layer (5) includes metal wires (13) and nylon wires (14), with at least six of each. The metal wires (13) are arranged at equal intervals outside the mica tape wrapping layer (4) along the direction of the wire core (2). The metal wires (13) and nylon wires (14) are staggered and interwoven into a mesh.

5. A torsion-resistant polyethylene insulated cable according to claim 1, characterized in that: The inner composite protective layer (6) includes a fire-resistant layer (15), a flame-retardant layer (16), and a heat insulation layer (17). The flame-retardant layer (16) is disposed outside the heat insulation layer (17), and the fire-resistant layer (15) is disposed outside the flame-retardant layer (16). The fire-resistant layer (15), the flame-retardant layer (16), and the heat insulation layer (17) are pressed together as one unit.

6. A torsion-resistant polyethylene insulated cable according to claim 1, characterized in that: The outer sheath (8) is provided with a waterproof coating (18), and the waterproof coating (18) is coated integrally with the outer sheath (8).

7. A torsion-resistant polyethylene insulated cable according to claim 6, characterized in that: The waterproof coating (18) is provided with an anti-corrosion coating (19) on the outside, and the anti-corrosion coating (19) and the waterproof coating (18) are coated as one piece.

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