Impact-resistant and distortion-resistant outdoor polyethylene power cable

Abstract

The invention discloses an impact-resistant and distortion-resistant outdoor polyethylene power cable, and relates to the technical field of cables, the impact-resistant and distortion-resistant outdoor polyethylene power cable comprises a cable core, four annularly distributed wire cores are arranged in the cable core, each wire core is composed of an inner-layer conductor, an outer-layer conductor, a heat conduction enhancement layer, an inner enhancement layer and an inner insulation layer, a shielding combination layer is arranged outside a wrapping layer, and a shielding layer is arranged outside the wrapping layer. The shielding combination layer is composed of a high-conductivity metal thin film layer, a nanometer shielding layer and a protective coating, the anti-impact combination layer is arranged outside the shielding combination layer, the anti-impact combination layer is composed of an impact dispersion layer and an energy absorption layer, the anti-distortion combination layer is arranged outside the anti-impact combination layer, and the anti-distortion combination layer is composed of an impact dispersion layer and an energy absorption layer. The anti-distortion combination layer is composed of a core layer and an elastic buffer layer, an outer sheath is arranged outside the anti-distortion combination layer, and the outer sheath is composed of a reinforcing layer, a blocking layer and an outer protective layer, so that the problems that the power cable is poor in impact resistance and distortion resistance and inconvenient to maintain are solved.

Description

Technical Field

[0001] The invention relates to the technical field of cables, in particular to an impact-resistant and torsion-resistant outdoor polyethylene power cable. Background Art

[0002] Power cable is an important equipment for transmitting and distributing electric energy. It is usually composed of a conductor, an insulation layer, a sheath layer and a possible shielding layer. It has excellent conductivity, insulation and mechanical strength. It can safely and efficiently transmit electricity from a power station or substation to the user end. It is widely used in urban power grids, industrial plants, underground projects and various power systems. It is one of the indispensable infrastructures in modern society.

[0003] For example, the Chinese authorized patent "A Mobile Metal Shielded Monitoring Rubber Sheathed Flexible Cable for Coal Mines" with announcement number CN118969369A includes a cable core and an inner sheath, a monitoring layer, a reinforcement layer, an outer sheath layer, an anti-twist color strip and a permanent concave and convex pressed mark arranged on the outside of the cable core in sequence; the outer sheath layer, the anti-twist color strip and the permanent concave and convex pressed mark adopt a one-time molding process; the reinforcement layer includes a reinforcing belt formed by spirally wrapping the reinforcing belt on the outside of the monitoring layer to form a columnar spiral structure, and a number of protrusions are evenly formed on the spiral edge of the columnar spiral structure, and the protrusions are formed by continuous bending of the reinforcing belt in the radial direction of the columnar spiral structure. Since the anti-twist color strip is embedded in the surface of the outer sheath layer, the anti-twist color strip can be integrated with the cable.

[0004] The above-mentioned prior art is affected by the installation environment when it is actually used. In particular, when used in harsh environments, the cable body is susceptible to impact and distortion, resulting in a reduction in service life. At the same time, it is difficult to find the compression points during the inspection and maintenance of the cable, which affects the maintenance work. Therefore, it does not meet the existing needs. In this regard, we propose an impact-resistant and torsion-resistant outdoor polyethylene power cable. Summary of the invention

[0005] The purpose of the present invention is to provide an impact-resistant and torsion-resistant outdoor polyethylene power cable to solve the problem that the power cable mentioned in the above background technology has poor impact resistance and torsion resistance and is inconvenient to maintain.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an impact-resistant and torsion-resistant outdoor polyethylene power cable, comprising a cable core, wherein four annularly distributed cores are arranged inside the cable core, and the cores are twisted with each other, and the core consists of an inner conductor, an outer conductor, a thermally conductive reinforcement layer, an inner reinforcement layer and an inner insulation layer, and the outside of the cable core is wrapped with a sheath, and a shielding combination layer is arranged outside the sheath, and the shielding combination layer consists of a highly conductive metal film layer, a nano-shielding layer and a protective coating, and an impact-resistant combination layer is arranged outside the shielding combination layer, and the impact-resistant combination layer consists of an impact dispersion layer and an energy absorption layer, and an anti-twisting combination layer is arranged outside the impact-resistant combination layer, and the anti-twisting combination layer consists of a core layer and an elastic buffer layer, and an outer sheath is arranged outside the anti-twisting combination layer, and the outer sheath consists of a strengthening layer, a barrier layer and an outer sheath.

[0007] Preferably, the inner conductor and the outer conductor are formed by twisting a plurality of strands of nano-scale copper-silver alloy, the outer conductor is located outside the inner conductor, and the outer conductor has a larger diameter than the inner conductor.

[0008] Preferably, the thermally conductive enhancement layer is coated on the outer wall of the outer conductor by chemical vapor deposition technology, the inner enhancement layer is tightly wrapped on the outer wall of the thermally conductive enhancement layer in a cross-woven manner, and the inner insulating layer is coated on the outer wall of the inner enhancement layer by multi-layer co-extrusion technology.

[0009] Preferably, the highly conductive metal film layer is stacked in multiple layers on the outer wall of the wrapping layer, the nano-shielding layer is fixed on the outer wall of the highly conductive metal film layer by an adhesive, and the protective coating is coated on the outer wall of the nano-shielding layer.

[0010] Preferably, the impact dispersion layer is a multi-layer wavy structure, and the impact dispersion layer and the shielding combination layer are fixed by an adhesive, the energy absorption layer is fixed to the impact dispersion layer by an adhesive, and the energy absorption layer and the core layer are connected by an interface reinforcement layer.

[0011] Preferably, elastic support columns arranged along the axial direction of the cable are embedded in the energy absorbing layer.

[0012] Preferably, the elastic buffer layer is a multi-layer structure, and the elastic buffer layer and the core layer are fixed by an adhesive, and the elastic buffer layer and the reinforcement layer are fixed by a high-viscosity epoxy resin.

[0013] Preferably, the barrier layer is wrapped on the outer wall of the strengthening layer by an extrusion process, and the outer protective layer is wrapped on the outer wall of the barrier layer by an extrusion process.

[0014] Preferably, a pressure-chromic layer is coated on the outer wall of the outer protective layer, and wear-resistant protrusions are adhered and fixed to the outer wall of the pressure-chromic layer.

[0015] Preferably, a multi-layer microporous structure is embedded in the composite material of the nano-shielding layer.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention optimizes the internal structure of the wire core. The nano-scale copper-silver alloy conductor has lower resistivity and better corrosion resistance, which can significantly improve the conductive efficiency and stability of the cable. The introduction of the graphene composite layer effectively improves the thermal conductivity of the cable, reduces the operating temperature of the cable, and improves the current carrying capacity and long-term stability of the cable. The addition of aramid fiber significantly improves the tensile, torsion and impact resistance of the cable, so that the cable can maintain stable performance in harsh environments. The excellent insulation performance and mechanical strength design effectively prevent the safety hazards such as short circuit and leakage caused by external force damage or overheating of the cable, thereby ensuring the safety of power transmission.

[0017] 2. The present invention is provided with an anti-twisting combined layer, and the aramid fiber braided belt is used as the core supporting layer, which can effectively resist torsional deformation and protect the internal structure of the cable from damage. The elastic buffer layer can provide buffering and energy absorption during the twisting process, while maintaining the flexibility of the cable, which is convenient for installation and bending. The interface bonding layer firmly bonds the anti-twisting layer to the outer sheath, thereby enhancing the overall stability of the cable and preventing delamination or peeling during the twisting process. Although the anti-twisting layer mainly focuses on mechanical properties, reasonable structural design can ensure that it has minimal impact on the conductive properties of the cable and maintains the efficient transmission capacity of the cable.

[0018] 3. The present invention is provided with an impact-resistant combined layer, an impact dispersion layer and an energy absorption layer, which can efficiently absorb and disperse external impact energy and protect the internal structure of the cable from damage. The design of the microporous foam material and the elastic support column allows the impact-resistant layer to maintain high impact absorption while maintaining the flexibility of the cable, which is convenient for installation and bending. The use of the interface reinforcement layer significantly improves the bonding strength between the impact-resistant layer and the anti-twisting combined layer, prevents the occurrence of delamination or peeling, and enhances the overall stability of the cable. By selecting lightweight and high-performance materials and optimizing the structural design, the impact-resistant layer is lightweight, the overall weight of the cable is reduced, and it is easy to transport and install. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an overall stereogram of the present invention; Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention; Figure 3 It is a three-dimensional diagram of the wire core of the present invention; Figure 4 A three-dimensional diagram of the shielding combination layer of the present invention; Figure 5 It is a three-dimensional diagram of the impact-resistant composite layer of the present invention; Figure 6 A three-dimensional diagram of the anti-distortion combination layer of the present invention; Figure 7 It is a three-dimensional diagram of the outer sheath of the present invention.

[0020] In the figure: 1. wire core; 11. inner conductor; 12. outer conductor; 13. thermal conductivity enhancement layer; 14. inner reinforcement layer; 15. inner insulation layer; 2. winding layer; 3. shielding combination layer; 31. high conductivity metal film layer; 32. nano shielding layer; 33. protective coating; 4. impact-resistant combination layer; 41. impact dispersion layer; 42. energy absorption layer; 43. elastic support column; 5. anti-twist combination layer; 51. core layer; 52. elastic buffer layer; 53. interface bonding layer; 6. outer sheath; 61. reinforcement layer; 62. barrier layer; 63. outer sheath; 64. pressure color change layer; 7. wear-resistant protrusions. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] See also Figure 1 , Figure 2 and Figure 3 An embodiment of the present invention is as follows: an impact-resistant and torsion-resistant outdoor polyethylene power cable, comprising a cable core, wherein four annularly distributed wire cores 1 are arranged inside the cable core, and the wire cores 1 are twisted with each other, and the wire core 1 is composed of an inner conductor 11, an outer conductor 12, a thermally conductive reinforcement layer 13, an inner reinforcement layer 14 and an inner insulating layer 15. The outer part of the cable core is wrapped with a sheath 2, and the inner conductor 11 and the outer conductor 12 are twisted by multiple strands of nano-scale copper-silver alloy, and the outer conductor 12 is located outside the inner conductor 11, and the diameter of the outer conductor 12 is larger than that of the inner conductor 11, and the thermally conductive reinforcement layer 13 is coated on the outer wall of the outer conductor 12 by chemical vapor deposition technology, and the inner reinforcement layer 14 is tightly wrapped on the outer wall of the thermally conductive reinforcement layer 13 in a cross-woven manner, and the inner insulating layer 15 is coated on the outer wall of the inner reinforcement layer 14 by multi-layer co-extrusion technology.

[0023] The conductor uses nano-scale copper-silver alloy as the conductor material. This alloy not only has the high conductivity of copper, but also combines the excellent corrosion resistance and antibacterial properties of silver. It can maintain stable conductivity in extreme environments. It is designed as a multi-layer stranded wire structure, with the inner layer being tightly twisted fine copper-silver alloy wires, and the outer layer being thicker copper-silver alloy wires wrapped in a spiral shape to form a "core-shell" structure. This design not only enhances the mechanical strength of the conductor, but also improves the uniformity of current transmission; the thermal conductive enhancement layer 13 adds a layer of micro-nanostructured graphene composite layer to the outer layer of the conductor. With its extremely high thermal conductivity, graphene can effectively and quickly conduct the heat generated by the conductor to the outside, reduce the operating temperature of the cable, and improve the current carrying capacity and stability of the cable. The graphene composite layer is evenly coated on the surface of the conductor through chemical vapor deposition technology to form a thin, continuous and highly conductive coating while maintaining the flexibility of the cable; the inner reinforcement layer 14 introduces high-strength aramid fiber as a mechanical reinforcement layer, which has It has extremely high tensile strength and toughness, which can significantly improve the cable's tensile, torsion and impact resistance. The aramid fiber is tightly wrapped around the thermal conductive reinforcement layer in a cross-woven manner to form a solid protective layer while maintaining the flexibility of the cable; the inner insulation layer 15 is polyimide, which has excellent electrical insulation properties, thermal stability and chemical corrosion resistance, and can effectively isolate the conductor from the external environment to ensure the safe operation of the cable. It adopts multi-layer co-extrusion technology to form a dense insulation structure. At the same time, anti-aging agents, anti-ultraviolet stabilizers and other additives are added to the insulation layer to extend the service life of the cable. See also Figure 1 , Figure 2 and Figure 4 A shielding composite layer 3 is arranged on the outside of the wrapping layer 2, and the shielding composite layer 3 is composed of a high-conductivity metal film layer 31, a nano-shielding layer 32 and a protective coating 33. The high-conductivity metal film layer 31 is superimposed on the outer wall of the wrapping layer 2 in multiple layers, and the nano-shielding layer 32 is fixed on the outer wall of the high-conductivity metal film layer 31 by an adhesive. The protective coating 33 is coated on the outer wall of the nano-shielding layer 32, and a multi-layer microporous structure is embedded in the composite material of the nano-shielding layer 32.

[0024] The highly conductive metal film layer 31 is aluminum foil, which has excellent conductivity, can quickly conduct and disperse electromagnetic waves, reduce signal interference, and is a multi-layer superposition to increase the conductive path and improve the shielding effectiveness. At the same time, the thin and light design of the film helps to reduce the overall weight of the cable; the nano shielding layer 32 uses a polymer-based composite material reinforced with nanoparticles (such as nanographite, nanosilver or nanoferrite), which not only has excellent conductivity and shielding effectiveness, but also improves the mechanical properties and corrosion resistance of the material through the addition of nanoparticles. The multi-layer microporous structure can absorb and disperse electromagnetic waves, further enhancing the shielding effect. At the same time, the microporous structure also helps to reduce the weight of the cable; the protective coating 33 is polyethylene, which increases the wear resistance and tear resistance of the cable.

[0025] See also Figure 1 , Figure 2 and Figure 5 An impact-resistant composite layer 4 is arranged on the outside of the shielding composite layer 3. The impact-resistant composite layer 4 consists of an impact dispersion layer 41 and an energy absorption layer 42. The impact dispersion layer 41 is a multi-layer wavy structure, and the impact dispersion layer 41 and the shielding composite layer 3 are fixed by an adhesive. The energy absorption layer 42 is fixed to the impact dispersion layer 41 by an adhesive. The energy absorption layer 42 is connected to the core layer 51 by an interface reinforcement layer. The energy absorption layer 42 is embedded with elastic support columns 43 arranged along the axial direction of the cable.

[0026] The impact dispersion layer 41 is a polyurethane reinforced with nanoparticles, which can quickly disperse stress and reduce local damage when impacted. It is designed as a multi-layer wavy structure. This structure can not only increase the surface area of ​​the material and improve the impact absorption efficiency, but also absorb and disperse energy through structural deformation when impacted; the energy absorption layer 42 is microporous polyethylene, which has excellent energy absorption capacity and recovery; the elastic support column 43 can provide additional support and cushioning when impacted while maintaining the flexibility of the cable; the interface reinforcement layer uses a high-viscosity thermoplastic elastomer and is located between the impact-resistant layer and the anti-twist combination layer. Through a special bonding process, the impact-resistant layer is firmly bonded to the anti-twist combination layer, and at the same time the interface strength between the two layers is enhanced to prevent stratification or peeling when impacted.

[0027] See also Figure 1 , Figure 2 and Figure 6 An anti-twisting composite layer 5 is arranged outside the impact-resistant composite layer 4. The anti-twisting composite layer 5 is composed of a core layer 51 and an elastic buffer layer 52. The elastic buffer layer 52 is a multi-layer structure, and the elastic buffer layer 52 and the core layer 51 are fixed by an adhesive, and the elastic buffer layer 52 and the reinforcement layer 61 are fixed by a high-viscosity epoxy resin.

[0028] The core layer 51 is a carbon fiber braided belt with excellent mechanical properties and fatigue resistance, and can withstand large torque and bending stress. The braided belt is tightly wound on the outer wall of the cable core in a spiral shape to form a solid support layer to enhance its anti-twisting ability; the elastic buffer layer 52 is an ethylene-vinyl acetate copolymer foam layer with good buffering performance and energy absorption characteristics, which can absorb impact energy during the twisting process and protect the internal structure of the cable. The elastic buffer layer can be designed as a multi-layer structure, and each layer is connected by tiny elastic connection points, which not only maintains elasticity but also enhances the energy absorption effect; the interface bonding layer 53 is arranged between the elastic buffer layer and the outer sheath, and uses a high-viscosity epoxy resin, which can firmly bond the anti-twisting layer and the outer sheath together to prevent stratification or peeling during the twisting process; it not only plays a bonding role, but also can transfer stress to a certain extent, so that the outer sheath can also participate in the anti-twisting process, thereby enhancing the overall anti-twisting ability of the cable.

[0029] See also Figure 1 , Figure 2 and Figure 7 An outer sheath 6 is arranged outside the anti-twisting composite layer 5, and the outer sheath 6 is composed of a strengthening layer 61, a barrier layer 62 and an outer protective layer 63. The barrier layer 62 is wrapped on the outer wall of the strengthening layer 61 through an extrusion process, and the outer protective layer 63 is wrapped on the outer wall of the barrier layer 62 through an extrusion process.

[0030] The reinforcement layer 61 is polyester fiber, which has excellent mechanical properties and fatigue resistance, and can enhance the strength and wear resistance of the outer sheath. The multi-layer cross-woven mesh structure increases the tear resistance and overall stability of the outer sheath. The barrier layer 62 is high-density polyethylene, which has good anti-permeability and barrier properties, and can prevent the intrusion of moisture, oxygen and other chemicals, and protect the internal structure of the cable. A thin layer of nano-level barrier material, such as nano-alumina, is added to the middle barrier layer 62 to further improve the barrier performance; the outer protective layer 63 is made of weather-resistant and UV-resistant polyvinyl chloride, which can resist the erosion of bad weather and ultraviolet rays and extend the service life of the cable. Anti-aging agents and light stabilizers are added to the outer protective layer to improve the material's weather resistance and UV resistance. At the same time, the outer surface can be designed with a rough or non-slip texture to increase the grip and safety of the cable.

[0031] See also Figure 1 and Figure 7, the outer wall of the outer sheath 63 is coated with a pressure color-changing layer 64, and the outer wall of the pressure color-changing layer 64 is adhered and fixed with a wear-resistant protrusion 7. The pressure-induced color-changing material is a special functional material, and its color will change with the change of the external pressure. Under the action of the applied pressure, the structure or electronic state of the pressure-induced color-changing material will change, causing its color to change. Then when the cable is impacted or pressurized, the pressure-induced color-changing material at the impacted part will change color. By observing the change in color, the part that is impacted or pressurized can be quickly located, which is convenient for timely investigation and maintenance. At the same time, during the installation and laying process, if the bending force causes the material color in the pressure-induced color-changing material layer to change, the installation and laying operator can determine the bending force of the cable in real time according to the color change, thereby reducing the damage to the cable due to excessive bending force, which not only improves the safety and reliability of the cable, but also reduces the cost of maintenance and investigation. Through the change in color, the problem part can be quickly located, and repair and treatment can be carried out in time, avoiding safety accidents and economic losses caused by cable failure.

[0032] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An impact-resistant and torsion-resistant outdoor polyethylene power cable, comprising a cable core, characterized in that: The cable core is provided with four annularly distributed wire cores (1) inside, the wire cores (1) are twisted together, the wire core (1) is composed of an inner conductor (11), an outer conductor (12), a thermally conductive reinforcement layer (13), an inner reinforcement layer (14) and an inner insulating layer (15), the outer part of the cable core is wrapped with a wrapping layer (2), the outer part of the wrapping layer (2) is provided with a shielding combination layer (3), the shielding combination layer (3) is composed of a highly conductive metal film layer (31), a nano-shielding layer (32) and a protective coating (3 ... outer part of the shielding combination layer (3) is provided with a shielding combination layer (3), the outer part of the cable core is wrapped with a wrapping layer (2), the outer part of the wrapping layer (2) is provided with a shielding combination layer (3), the outer part of the shielding combination layer (3) An impact-resistant composite layer (4) is arranged outside the shielding composite layer (3), the impact-resistant composite layer (4) comprising an impact dispersion layer (41) and an energy absorption layer (42); an anti-distortion composite layer (5) is arranged outside the impact-resistant composite layer (4), the anti-distortion composite layer (5) comprising a core layer (51) and an elastic buffer layer (52); an outer sheath (6) is arranged outside the anti-distortion composite layer (5), the outer sheath (6) comprising a reinforcement layer (61), a barrier layer (62) and an outer sheath (63).

2. The impact-resistant and torsion-resistant outdoor polyethylene power cable according to claim 1, characterized in that: The inner conductor (11) and the outer conductor (12) are formed by twisting a plurality of strands of nano-scale copper-silver alloy; the outer conductor (12) is located outside the inner conductor (11); and the outer conductor (12) has a larger diameter than the inner conductor (11).

3. The impact-resistant and torsion-resistant outdoor polyethylene power cable according to claim 2, characterized in that: The thermally conductive enhancement layer (13) is coated on the outer wall of the outer conductor (12) by chemical vapor deposition technology, the inner enhancement layer (14) is tightly wrapped on the outer wall of the thermally conductive enhancement layer (13) in a cross-woven manner, and the inner insulating layer (15) is coated on the outer wall of the inner enhancement layer (14) by multi-layer co-extrusion technology.

4. The impact-resistant and torsion-resistant outdoor polyethylene power cable according to claim 1, characterized in that: The highly conductive metal film layer (31) is stacked in multiple layers on the outer wall of the wrapping layer (2), the nano shielding layer (32) is fixed to the outer wall of the highly conductive metal film layer (31) by means of an adhesive, and the protective coating (33) is coated on the outer wall of the nano shielding layer (32).

5. The impact-resistant and torsion-resistant outdoor polyethylene power cable according to claim 1, characterized in that: The impact dispersion layer (41) is a multi-layer wavy structure, and the impact dispersion layer (41) and the shielding combination layer (3) are fixed by an adhesive, the energy absorption layer (42) is fixed to the impact dispersion layer (41) by an adhesive, and the energy absorption layer (42) and the core layer (51) are connected by an interface reinforcement layer (53).

6. The impact-resistant and torsion-resistant outdoor polyethylene power cable according to claim 5, characterized in that: Elastic support columns (43) arranged along the axial direction of the cable are embedded in the energy absorption layer (42).

7. The impact-resistant and torsion-resistant outdoor polyethylene power cable according to claim 1, characterized in that: The elastic buffer layer (52) is a multi-layer structure, and the elastic buffer layer (52) and the core layer (51) are fixed by an adhesive, and the elastic buffer layer (52) and the reinforcement layer (61) are fixed by a high-viscosity epoxy resin.

8. The impact-resistant and torsion-resistant outdoor polyethylene power cable according to claim 1, characterized in that: The barrier layer (62) is wrapped on the outer wall of the reinforcement layer (61) by an extrusion process, and the outer protective layer (63) is wrapped on the outer wall of the barrier layer (62) by an extrusion process.

9. The impact-resistant and torsion-resistant outdoor polyethylene power cable according to claim 8, characterized in that: The outer wall of the outer protective layer (63) is coated with a pressure color-changing layer (64), and the outer wall of the pressure color-changing layer (64) is bonded and fixed with a wear-resistant protrusion (7).

10. The impact-resistant and torsion-resistant outdoor polyethylene power cable according to claim 4, characterized in that: A multi-layer microporous structure is embedded in the composite material of the nano-shielding layer (32).

Images