CN219017306U

CN219017306U - Novel low-voltage aluminum core coaxial power cable capable of improving current-carrying capacity

Info

Publication number: CN219017306U
Application number: CN202222581463.4U
Authority: CN
Inventors: 陈小焱; 张广健; 余宇; 毛剑颖
Original assignee: Guizhou Xinshuguang Cable Co ltd
Current assignee: Guizhou Xinshuguang Cable Co ltd
Priority date: 2022-09-28
Filing date: 2022-09-28
Publication date: 2023-05-12
Anticipated expiration: 2032-09-28

Abstract

The application relates to the technical field of electrical equipment, specifically discloses a novel low-voltage aluminum core coaxial power cable for improving current-carrying capacity, comprising: the novel aluminum wire comprises a stranded conductor, an insulating layer, a coaxial conductor and other sheath layers, wherein the stranded conductor is formed by stranding a plurality of aluminum wires and compacting the aluminum wires through a compacting die, and the aluminum wires are made of aluminum rods with the diameters of 8-10 phi mm and the diameters of 1-2 phi mm required by corresponding structures through wire drawing. The coaxial conductor is formed by arranging aluminum wires with the diameter of 1-2 phi mm and is wound on the periphery of the insulating layer, the coaxial conductor is wound on the periphery of the insulating layer, and other sheath layers are sleeved on the periphery of the coaxial conductor. The utility model aims at solving the problem that whole solid conductor bending property and electric energy transmission performance are not ideal, can reduce bending radius after the wire drawing transposition simultaneously, promotes the anti creep performance of cable and increases the electric energy transmission ability.

Description

Novel low-voltage aluminum core coaxial power cable capable of improving current-carrying capacity

Technical Field

The utility model relates to the technical field of electrical equipment, in particular to a novel low-voltage aluminum core coaxial power cable for improving current-carrying capacity.

Background

Copper has been used as a conductor material since the advent of cables. At present, the domestic copper mine resources in China are basically near to exhaustion, the copper mine resources are lack or the mining cost is too high, 80% of copper consumption is imported, the international copper price is increased under the current epidemic situation, and the cable industry is not different from a material revolution by replacing copper with aluminum. Some new projects in China begin to try aluminum core cables, but traditional power cables basically have limits on material use and economic cost, analyze the current development conditions of China and the world, and must develop the great trend of the conservation-oriented society. The design process and material use of the traditional power cable must be broken, thereby saving more economic cost.

At present, no matter a market product is a copper core conductor or an aluminum core conductor, when the installation operation is carried out in complex terrains and narrow spaces, the bending direction of a cable needs to be continuously changed, the bending radius of the solid conductor cable is too large, and the cable body is damaged greatly under the condition of forced bending, so that the service life of the cable is influenced, the quality of the cable is reduced, and safety accidents are easy to occur.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model solves the technical problem of providing a novel low-voltage aluminum core coaxial power cable for improving the current-carrying capacity and solves the problem of non-ideal bending performance and electric energy transmission performance of the whole solid conductor.

In order to solve the problems, the utility model adopts the following technical scheme: a novel low voltage aluminum core coaxial power cable for improving current carrying capacity, comprising: the novel aluminum wire comprises a stranded conductor, an insulating layer, a coaxial conductor and other sheath layers, wherein the stranded conductor is formed by stranding a plurality of aluminum wires and compacting the aluminum wires through a compacting die, and the aluminum wires are made of aluminum rods with the diameters of 8-10 phi mm and the diameters of 1-2 phi mm required by corresponding structures through wire drawing. The insulating layer is extruded on the surface of the stranded conductor, the coaxial conductor is formed by arranging aluminum wires with the diameter of 1-2 phi mm and is wound on the periphery of the insulating layer, and the other sheath layers are sleeved on the periphery of the coaxial conductor.

The beneficial effect that this scheme produced is: aluminum is used as a conductor material, aluminum rods with the diameter of 8-10mm are drawn into aluminum wires with the requirements of corresponding structures, a plurality of aluminum wires with the required sectional areas are stranded and are compressed and formed through a compression die, so that a stranded conductor is formed, the problem that the bending performance and the electric energy transmission performance of the whole solid conductor are not ideal is solved, meanwhile, after the aluminum wires are drawn and stranded, the bending radius can be reduced, the creep resistance of the cable is improved, and the electric energy transmission capacity is improved.

Further, the conductor also comprises a coaxial conductor which is formed by winding an aluminum wire on the surface of the insulating layer at a 30-45 DEG spiral angle according to the section requirement, the coaxial conductor is independently twisted, tightly pressed and wound on the surface of the insulating layer, the transmission performance is improved, the sectional area of the wire core during combination is reduced, and the surface of the coaxial conductor is enlarged under the condition that the coaxial conductor is made of the same aluminum conductive material. The skin effect of the coaxial conductor is better than that of a compressed stranded conductor with the same section when the alternating current system transmits electric energy.

Further, the outer surface of the coaxial conductor is also provided with an outer insulating layer, so that the insulating protection effect and the corrosion resistance of the coaxial conductor are improved.

Further, the insulating material of insulating layer and outer insulating layer is PVC polyvinyl chloride material, and PVC extrusion package can directly get into next process after stranded conductor and coaxial conductor surface cooling, and PVC polyvinyl chloride low price, quality are less simultaneously, have reduced the whole weight of cable, are convenient for install and lay, practice thrift manufacturing cost simultaneously.

Further, the insulating layer material is a crosslinked polyethylene material, and the molecular structure of the crosslinked polyethylene material is changed after the crosslinked polyethylene material is steamed or irradiated in the extrusion process, so that the insulating performance is increased.

Further, grooves are formed in the surfaces of the other sheath layers, the grooves are arranged in a spiral shape along the axial direction of the cable, so that air flow is guided to flow on the surfaces, and cooling is facilitated.

Drawings

FIG. 1 is a schematic diagram of a novel low-voltage aluminum core coaxial power cable with improved current carrying capacity;

fig. 2 is a flow chart of cable production.

Detailed Description

The following is a further detailed description of the embodiments:

reference numerals in the drawings of the specification include: a stranded conductor 1, an inner insulation 2, a coaxial conductor 3, an outer insulation layer 4, other sheath layers 5 and aluminum wires 11.

Example 1 is substantially as shown in figure 1: a novel low voltage aluminum core coaxial power cable for improving current carrying capacity, comprising: the method comprises the steps of twisting a conductor 1, an inner insulation 2, a coaxial conductor 3, an outer insulation layer 4, other sheath layers 5 and aluminum wires 11, wherein the twisted conductor is formed by twisting 18 aluminum wires and compacting the aluminum wires through a compacting die, the aluminum wires are made of aluminum rods with the diameter of 8-10 phi mm, the aluminum rods are drawn into corresponding structures, the diameters of 1 phi mm are required, PVC polyvinyl chloride inner insulation 2 is extruded on the surface of the twisted conductor 1, the aluminum wires 11 with the diameters of 1 phi mm are wound on the surface of the inner insulation 2 according to a helix angle of 35 degrees to form the coaxial conductor 3, the PVC outer insulation layer 4 is extruded on the outer surface of the coaxial conductor 3, and the other sheath layers 5 with spiral grooves are formed on the outer wrapping surface of the PVC outer insulation layer 4.

The specific implementation process comprises the following steps:

as shown in fig. 1 and 2: the novel low-voltage aluminum core coaxial power cable with improved current-carrying capacity adopts aluminum as a conductor material, and an insulating layer adopts PVC polyvinyl chloride material to form a structure of a stranded conductor, an insulating layer, a coaxial conductor 3, an outer insulating layer and other sheath layers. Firstly, drawing an aluminum rod with the diameter of phi 9mm into aluminum wires with the diameter of 1 phi mm required by a corresponding structure through a wire drawing process, twisting 18 aluminum wires according to the required sectional area, compacting and forming through a compacting die, heating, melting and extruding a PVC (polyvinyl chloride) insulating material through an extruder, uniformly extruding and wrapping the PVC insulating material onto the surface of a stranded conductor 1, and comprehensively designing the extrusion thickness according to the voltage grade and the mechanical property requirements. And sequentially winding the aluminum wires 11 obtained after wire drawing on the surface of an insulating layer according to the section requirement by the aluminum wires 11 at a helix angle of 35 degrees to form a coaxial conductor 3, heating, melting and extruding the PVC polyvinyl chloride insulating material through an extruder, uniformly extruding and wrapping the PVC polyvinyl chloride insulating material on the surface of the coaxial conductor 3, comprehensively designing the extrusion thickness according to the voltage grade and the mechanical property requirement, and finally wrapping the outer surface of the outer insulating layer 4 with other sheath layers 5 with spiral grooves.

Example 2:

example 2 differs from example 1 in that the insulating layer material of the insulating layer and the outer insulating layer 4 is a crosslinked polyethylene material, the crosslinked polyethylene material is steamed or irradiated during extrusion, and the crosslinked polyethylene insulating material is steamed after extrusion, so that the analytical structure of the material is changed, and the insulating property is increased.

The foregoing is merely exemplary embodiments of the present utility model, and specific structures and features that are well known in the art are not described in detail herein. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present utility model, and these should also be considered as the scope of the present utility model, which does not affect the effect of the implementation of the present utility model and the utility of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.

Claims

1. The utility model provides a novel low pressure aluminium core coaxial power cable of improvement current-carrying capacity which characterized in that: comprising the following steps: the cable comprises a stranded conductor, an insulating layer, a coaxial conductor and other sheath layers, wherein the stranded conductor is formed by stranding a plurality of aluminum wires and compacting the aluminum wires through a compacting die, and the aluminum wires are made of aluminum rods with the diameter of 8-10 phi mm and the diameter of 1-2 phi mm required by a corresponding structure through wire drawing; the insulating layer is extruded on the surface of the stranded conductor, the coaxial conductor is formed by arranging aluminum wires with the diameter of 1-2 phi mm and is wound on the periphery of the insulating layer, and the other sheath layers are sleeved on the periphery of the coaxial conductor.

2. A novel low voltage aluminum core coaxial power cable of enhanced current carrying capacity as claimed in claim 1, wherein: the coaxial conductor is wound on the surface of the insulating layer at a helix angle of 30-45 degrees.

3. A novel low voltage aluminum core coaxial power cable of enhanced current carrying capacity as claimed in claim 1, wherein: the outer surface of the coaxial conductor is also provided with an outer insulating layer.

4. A novel low voltage aluminum core coaxial power cable of enhanced current carrying capacity as claimed in claim 1, wherein: the insulating material of the insulating layer and the outer insulating layer is PVC polyvinyl chloride material.

5. A novel low voltage aluminum core coaxial power cable of enhanced current carrying capacity as claimed in claim 1, wherein: the insulating materials of the insulating layer and the outer insulating layer are crosslinked polyethylene materials.

6. A novel low voltage aluminum core coaxial power cable of enhanced current carrying capacity as claimed in claim 1, wherein: the surfaces of the other sheath layers are provided with spiral grooves.