Anti-twist polyethylene sheath power cable

Abstract

The utility model discloses an anti-twist polyethylene sheath power cable, which comprises a cable core and at least six wire cores, the wire cores are arranged in the cable core, a filling layer is arranged in a gap between the wire cores and the cable core, a protection frame is arranged in the filling layer, a mica tape layer is arranged outside the cable core, and a sheath layer is arranged outside the mica tape layer. An outer insulating layer is arranged outside the mica tape layer, an outer shielding layer is arranged outside the outer insulating layer, a flame-retardant layer is arranged outside the outer shielding layer, an anti-twisting layer is arranged outside the flame-retardant layer, an armor layer is arranged outside the anti-twisting layer, a polyethylene outer sheath is arranged outside the armor layer, and a sheath layer is arranged outside the polyethylene outer sheath. The protection frame is arranged in the power cable, and a protection structure is formed outside the internal core wire, so that the structural strength of the power cable is improved, the stability of the internal core wire is ensured when the external part of the power cable is stressed, and the service life of the power cable is prolonged.

Description

Technical Field

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

[0002] Cables are conductors made of one or more mutually insulated conductors and an outer insulating protective layer. They are laid underground, in the air, etc. Power cables are cable products used in the main lines of power systems to transmit and distribute high-power electrical energy, including power cables of various voltage levels from 1-500KV and above, and of various insulation types. The basic structure of a power cable consists of four parts: the conductor core, the insulation layer, the shielding layer, and the protective layer. They are commonly used in urban underground power grids, power plant lead-out lines, internal power supply in industrial and mining enterprises, and underwater transmission lines across rivers and seas.

[0003] Chinese Patent Publication No. CN107910109A, authorized on April 13, 2018, discloses an anti-torsion power cable, comprising a protective sheath, a steel wire braided shielding layer, and an insulation layer distributed sequentially from the outside to the inside. Six conductors are distributed inside the insulation layer. Each conductor comprises a conductor, a small insulation layer, and a small steel wire braided shielding layer distributed sequentially from the inside to the outside. The insulation layer contains filler material. Three of the conductors form an equilateral triangle structure. A closed buffer band surrounds the equilateral triangle structure of the conductors, with the remaining three conductors evenly distributed and abutting against the buffer band and the insulation layer. This invention features a reasonable structural design. The internal conductors are evenly distributed while ensuring secure installation, avoiding contact between conductors and the application of multiple forces. The use of the buffer band provides sufficient elastic buffer space for the conductors when the cable deforms, improving the cable's flexibility, preventing conductor breakage, effectively extending the cable's service life, and reducing socio-economic losses.

[0004] The internal cores of existing power cables are tightly connected, resulting in poor torsional resistance. When the power cable is subjected to external forces, the internal cores are subjected to multi-directional forces, which can easily lead to core deformation and breakage, reducing the service life of the power cable and failing to meet usage requirements. Utility Model Content

[0005] The purpose of this utility model is to provide a torsion-resistant polyethylene sheathed power cable to solve the problems mentioned in the background art, such as the tight connection of the internal core wires of existing power cables, poor torsion resistance, and the fact that the internal core wires are subjected to multi-directional forces when the power cable is subjected to external forces, which can easily lead to core wire deformation and breakage, reduce the service life of the power cable, and fail to meet the usage requirements.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a torsion-resistant polyethylene sheathed power cable, comprising a cable core and conductor cores, wherein the conductor cores are disposed inside the cable core, and at least six conductor cores are disposed thereon; a filling layer is disposed at the gap between the conductor cores and the cable core; a protective frame is disposed inside the filling layer and disposed outside the conductor cores; a mica tape layer is disposed outside the cable cores; an outer insulation layer is disposed outside the mica tape layer; an outer shielding layer is disposed outside the outer insulation layer; the outer insulation layer and the outer shielding layer are sequentially extruded outside the mica tape layer; a flame-retardant layer is disposed outside the outer shielding layer and is bonded to the outer shielding layer; an anti-torsion layer is disposed outside the flame-retardant layer and is bonded to the flame-retardant layer; an armor layer is disposed outside the anti-torsion layer and is bonded to the anti-torsion layer; and a polyethylene outer sheath is disposed outside the armor layer and is bonded to the armor layer.

[0007] Preferably, the wire core includes a conductor, an inner insulation layer, and an inner shielding layer. The conductor is formed by twisting multiple copper wires together. The inner insulation layer is disposed outside the conductor, and the inner shielding layer is disposed outside the inner insulation layer. The inner insulation layer and the inner shielding layer are formed sequentially by extrusion outside the conductor.

[0008] Preferably, the protective frames are equidistantly arranged along the direction of the wire core, and the distance between two adjacent protective frames is set to fifty centimeters.

[0009] Preferably, the protective frame is provided with through holes, at least three through holes are provided, and the through holes are equidistantly arranged on the protective frame.

[0010] Preferably, the anti-twist layer is provided with hemp rope inside, and there are at least six hemp ropes, which are equidistantly arranged inside the anti-twist layer along the direction of the wire core.

[0011] Preferably, the inner shielding layer is provided with a woven mesh sleeve on the outside, and the woven mesh sleeve is connected to the inner shielding layer as a whole.

[0012] Preferably, the mica tape layer is spirally wound around the outside of the cable core.

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

[0014] This utility model device, through the setting of a protective frame, an anti-torsion layer, and hemp rope, enhances the overall structural strength of the cable. The protective frame is made of aramid fiber braided tape, which can provide buffering and energy absorption during torsion while maintaining the flexibility of the cable. The anti-torsion layer is made of vinyl acetate copolymer foam, which has good buffering performance and energy absorption characteristics. It can absorb impact energy during torsion and protect the internal structure of the cable. The hemp rope increases the structural strength of the anti-torsion layer and can effectively prevent cracking when the anti-torsion layer is bent under stress, thereby improving the anti-torsion effect of the power cable.

[0015] This utility model device incorporates a braided mesh sleeve made of woven fibers. The braided mesh sleeve increases the twist resistance and tensile strength of the wire core, and adds a protective structure inside the cable to effectively prevent the wire core from breaking when the cable is bent. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a cross-sectional view of the cable core of this utility model;

[0018] Figure 3 This is a structural diagram showing the connection between the wire core and the protective frame of this utility model;

[0019] Figure 4 This is a diagram of the wire core structure of this utility model;

[0020] Figure 5 This is a cross-sectional view of the anti-torsion layer of this utility model.

[0021] In the diagram: 1. Cable core; 2. Wire core; 3. Filler layer; 4. Protective frame; 5. Mica tape layer; 6. Outer insulation layer; 7. Outer shielding layer; 8. Flame retardant layer; 9. Anti-torsion layer; 10. Armoring layer; 11. Polyethylene outer sheath; 12. Through hole; 13. Conductor; 14. Inner insulation layer; 15. Inner shielding layer; 16. Braided mesh sleeve; 17. Hemp rope. Detailed Implementation

[0022] 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.

[0023] Please see Figure 1-5This utility model provides an embodiment of an anti-torsion polyethylene sheathed power cable, comprising a cable core 1 and conductor cores 2. Conductor cores 2 are disposed inside the cable core 1, and at least six conductor cores 2 are provided. A filling layer 3 is provided at the gap between the conductor cores 2 and the cable core 1. A protective frame 4 is provided inside the filling layer 3 and is disposed outside the conductor core 2. A mica tape layer 5 is provided outside the cable core 1, spirally wound around the outside of the cable core 1. An outer insulation layer 6 is provided outside the mica tape layer 5. An outer shielding layer 7 is provided outside the outer insulation layer 6. The outer insulation layer 6 and the outer shielding layer 7 are sequentially extruded outside the mica tape layer 5. A flame-retardant layer 8 is provided outside the outer shielding layer 7 and is bonded to the outer shielding layer 7. An anti-torsion layer 9 is provided outside the flame-retardant layer 8 and is bonded to the flame-retardant layer 8. An armor layer 1 is provided outside the anti-torsion layer 9. 0, and the armor layer 10 is bonded to the anti-torsion layer 9. The outer side of the armor layer 10 is provided with a polyethylene outer sheath 11, and the polyethylene outer sheath 11 is bonded to the armor layer 10. The protective frame 4 is equidistantly arranged along the direction of the conductor 2, and the distance between two adjacent protective frames 4 is set to fifty centimeters. The protective frame 4 is provided with through holes 12, and there are at least three through holes 12, and the through holes 12 are equidistantly arranged on the protective frame 4. The protective frame 4 is made of aramid fiber braided tape, which enhances the overall structural strength of the cable. The aramid fiber braided tape can provide buffering and energy absorption during the torsion process, while maintaining the flexibility of the cable, effectively resisting torsional deformation, and protecting the internal structure of the cable from damage. The anti-torsion layer 9 is made of vinyl acetate copolymer foam, which has good buffering performance and energy absorption characteristics. It can absorb impact energy during the torsion process, protect the internal structure of the cable, and improve the performance of the power cable.

[0024] Please see Figure 1 and Figure 4 The wire core 2 includes a conductor 13, an inner insulation layer 14, and an inner shielding layer 15. The conductor 13 is made of multiple copper wires twisted together. The inner insulation layer 14 is disposed outside the conductor 13, and the inner shielding layer 15 is disposed outside the inner insulation layer 14. The inner insulation layer 14 and the inner shielding layer 15 are sequentially extruded outside the conductor 13. A braided mesh sleeve 16 is disposed outside the inner shielding layer 15, and the braided mesh sleeve 16 is connected to the inner shielding layer 15 as a whole. The braided mesh sleeve 16 is made of fiber braiding. The braided mesh sleeve 16 increases the torsion resistance and tensile strength of the wire core 2, and effectively prevents the wire core 2 from breaking when bending the cable.

[0025] Please see Figure 1 and Figure 5 The anti-torsion layer 9 is provided with hemp rope 17 inside. There are at least six hemp ropes 17, and the hemp ropes 17 are equidistantly arranged inside the anti-torsion layer 9 along the direction of the wire core 2. The hemp ropes 17 increase the structural strength of the anti-torsion layer 9 and can effectively prevent cracking when the anti-torsion layer 9 is subjected to bending force, thereby improving the service life of the power cable.

[0026] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0027] 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 sheathed power cable, comprising a cable core (1) and a conductor core (2), characterized in that: The wire core (2) is disposed inside the cable core (1), and at least six wire cores (2) are disposed thereon. A filling layer (3) is disposed at the gap between the wire core (2) and the cable core (1). A protective frame (4) is disposed inside the filling layer (3), and the protective frame (4) is disposed outside the wire core (2). A mica tape layer (5) is disposed outside the cable core (1). An outer insulation layer (6) is disposed outside the mica tape layer (5). An outer shielding layer (7) is disposed outside the outer insulation layer (6). The outer insulation layer (6) and the outer shielding layer (7) are disposed on the mica tape layer (5). 5) The outer part is formed by extrusion. The outer shielding layer (7) is provided with a flame retardant layer (8) and the flame retardant layer (8) is attached to the outer shielding layer (7). The flame retardant layer (8) is provided with an anti-torsion layer (9) and the anti-torsion layer (9) is attached to the flame retardant layer (8). The anti-torsion layer (9) is provided with an armor layer (10) and the armor layer (10) is attached to the anti-torsion layer (9). The armor layer (10) is provided with a polyethylene outer sheath (11) and the polyethylene outer sheath (11) is attached to the armor layer (10).

2. The anti-torsion polyethylene sheathed power cable according to claim 1, characterized in that: The core (2) includes a conductor (13), an inner insulation layer (14) and an inner shielding layer (15). The conductor (13) is made of multiple copper wires twisted together. The inner insulation layer (14) is disposed outside the conductor (13), and the inner shielding layer (15) is disposed outside the inner insulation layer (14). The inner insulation layer (14) and the inner shielding layer (15) are formed by extrusion on the outside of the conductor (13).

3. The anti-torsion polyethylene sheathed power cable according to claim 1, characterized in that: The protective frames (4) are equidistantly arranged along the direction of the core (2), and the distance between two adjacent protective frames (4) is set to fifty centimeters.

4. The anti-torsion polyethylene sheathed power cable according to claim 1, characterized in that: The protective frame (4) is provided with through holes (12), and there are at least three through holes (12), and the through holes (12) are equidistantly arranged on the protective frame (4).

5. The anti-torsion polyethylene sheathed power cable according to claim 1, characterized in that: The anti-twist layer (9) is provided with hemp ropes (17), and there are at least six hemp ropes (17), which are equidistantly arranged inside the anti-twist layer (9) along the direction of the core (2).

6. The anti-torsion polyethylene sheathed power cable according to claim 2, characterized in that: The inner shielding layer (15) is provided with a woven mesh sleeve (16) on the outside, and the woven mesh sleeve (16) is connected to the inner shielding layer (15) as a whole.

7. The anti-torsion polyethylene sheathed power cable according to claim 1, characterized in that: The mica tape layer (5) is spirally wound around the outside of the cable core (1).

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