Flame-retardant temperature-resistant environment-friendly overhead insulated cable

Abstract

The utility model relates to the technical field of aerial cables, in particular to a flame-retardant temperature-resistant environment-friendly aerial insulated cable, which comprises three wire cores distributed in a triangular shape. The filling part is filled around the wire cores and forms a cable core with the cross section of a triangular-like structure, the outer contour surface of the cable core comprises three straight line sections and three arc line sections, the three arc line sections correspond to the positions of the wire cores, and the three straight line sections correspond to the position between the two wire cores; the overall appearance of the insulation processing cable provided by the utility model is arranged to be a triangle-like structure, the structure has the advantages of good wind resistance and small cable material usage amount, the conductor used by the wire cores is an aluminum alloy stranded structure, the tensile steel strand is arranged among the three wire cores, and the composite wrapping layer wrapping the cable cores is matched, so that the tensile strength of the cable is improved. Good tensile and flame-retardant effects can be formed, the filling layer adopts a recycled sheath material structure, the cable structure design is beneficial to later recycling and reuse, and the concept of environment-friendly production is met.

Description

Technical Field

[0001] The utility model relates to the technical field of overhead cables, and particularly relates to a flame-retardant, temperature-resistant and environment-friendly overhead insulated cable. Background Art

[0002] An overhead insulated cable is an overhead conductor equipped with an insulating layer and a protective outer sheath. It is a special cable manufactured using a production process similar to that of cross-linked cables. It is a new power transmission method between overhead conductors and underground cables and is widely used in power transmission at home and abroad.

[0003] Compared with overhead bare cables, overhead insulated cables have obvious advantages in areas such as industrial and mining enterprises and building lighting. For example, some equipment in industrial and mining enterprises requires a large amount of electrical energy supply, and the environment is complex and changeable. Overhead insulated cables can effectively solve these problems and ensure the normal operation of the equipment. In special environmental areas such as lightning-prone areas, old industrial areas, old urban areas, and salt spray areas, overhead insulated cables can play an important role with their excellent insulation performance and environmental adaptability.

[0004] An overhead insulated cable usually consists of single-core, three-core or four-core wire cores forming a circular cable core, and a sheath layer is arranged outside the cable core. In order to improve the tensile performance, steel-core aluminum stranded wires are usually used for the wire cores. This cable structure is heavy, uses a large amount of insulating material and filling material, and is not conducive to the later recycling and reuse of the cable due to the mixing of aluminum alloy wires and steel wires. Summary of the Invention

[0005] In view of the technical problems existing in the overhead insulated cable in the prior art, the first aspect of the utility model provides a flame-retardant, temperature-resistant and environment-friendly overhead insulated cable, comprising:

[0006] Three wire cores distributed in a triangular shape;

[0007] A filling component, filled around the wire cores and forming a cable core with a cross-section of a quasi-triangular structure. The outer contour surface of the cable core includes three straight line segments and three arc segments. The three arc segments correspond to the positions of the wire cores, and the three straight line segments correspond to the positions between two wire cores;

[0008] A composite wrapping layer, covering the outer wall of the filling component;

[0009] An outer sheath, extruded on the outer wall of the composite wrapping layer;

[0010] Wherein, the filling component includes filling strips and a filling layer, and are respectively arranged in different areas of the cable core: the filling strips are arranged in the middle of the three wire cores, and the filling layer is arranged on the outer walls of the three wire cores;

[0011] A tensile composite steel wire bundle is provided inside the filling strip, and the tensile composite steel wire bundle is configured to be formed by twisting fine steel wires and glass fiber filaments / aramid fiber filaments together.

[0012] Preferably, the filling strip is configured to include three concave arc surfaces, and the three arc surfaces are respectively attached to the outer walls of the corresponding line cores.

[0013] Preferably, the tensile composite steel wire bundle is arranged at the central position inside the filling strip, and the outer circumscribed circle diameter of the tensile composite steel wire bundle is smaller than the inner inscribed circle diameter of the filling strip.

[0014] Preferably, the filling layer covers the outer walls of the three line cores and the filling strip, and fills the gaps between the line cores and the filling strip. The connection between the filling layer and the filling strip is located at the connection line of the axes of two adjacent line cores.

[0015] Preferably, the filling strip and the filling layer include a polyvinyl chloride filling layer.

[0016] Preferably, the tensile composite steel wire bundle includes a composite steel strand structure formed by twisting multiple fine steel wires with a diameter range of 0.5 - 1 mm and glass fiber filaments / aramid fiber filaments together, and the usage ratio of the two is 1:(1 - 2).

[0017] Preferably, the line core includes an aluminum stranded wire, a semi-conductive wrapping layer, a cross-linked polyethylene insulation layer, and a shielding layer. The semi-conductive wrapping layer covers the outer wall of the aluminum stranded wire, and the cross-linked polyethylene insulation layer is extruded on the outer wall of the semi-conductive wrapping layer.

[0018] Preferably, the shielding layer includes a longitudinally wrapped copper tape layer, and the longitudinally wrapped copper tape layer covers the outer wall of the cross-linked polyethylene insulation layer.

[0019] Preferably, the composite wrapping layer includes a wrapping tape body. The wrapping tape body includes a first structural layer and a second structural layer. The first structural layer includes a glass fiber tape layer, and the second structural layer includes an aramid braided layer. The glass fiber tape layer and the aramid braided layer are adhesively fixed.

[0020] Preferably, the wrapping overlap rate of the wrapping tape body is 50% - 70%.

[0021] Compared with the prior art, the advantages of the lightweight flame-retardant, temperature-resistant, and environmentally friendly overhead insulated cable of the present utility model are as follows:

[0022] The overall shape of the lightweight flame-retardant, temperature-resistant and environmentally friendly overhead insulated cable proposed by the present utility model is set as a triangular-like structure, which improves the wind resistance performance and has the advantage of less use of cable material. The conductor used for the core is an aluminum alloy stranded structure, and a load-bearing composite steel strand is arranged between the three cores. On the one hand, a lightweight design is adopted to reduce the total weight of the overhead cable. On the other hand, in cooperation with the composite wrapping layer covering the cable core, good tensile and flame-retardant effects can be formed. The filling layer uses a recycled sheath material structure, and the cable structure design is conducive to later recycling and reuse, meeting environmental protection production requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in each figure may be denoted by the same reference numeral. For the sake of clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the present utility model will be described by way of example and with reference to the drawings, wherein:

[0024] Figure 1 is a schematic structural diagram of the flame-retardant, temperature-resistant and environmentally friendly overhead insulated cable shown in the present utility model;

[0025] Figure 2 is a schematic cross-sectional structural diagram of the flame-retardant, temperature-resistant and environmentally friendly overhead insulated cable shown in the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] In order to better understand the technical content of the present utility model, specific embodiments are hereby given and described in conjunction with the accompanying drawings as follows.

[0027] As Figure 1 and Figure 2 shown, a first aspect of the present utility model provides a flame-retardant, temperature-resistant and environmentally friendly overhead insulated cable, which includes a core 10, a filling member 20, a composite wrapping layer 40 and an outer sheath 50. The core 10 is wrapped together by the filling member 20 and the composite wrapping layer 40 to form a cross-sectional structure of a predetermined shape, and the outer sheath 50 provides environmental protection on the outermost side.

[0028] In a preferred embodiment, since the triangular structure has good stability and can reduce the shaking and damage of the cable caused by natural factors such as wind and rain, and in addition, the triangular-like cross-section can reduce the use of materials and waste of resources, three cores 10 distributed in a triangle are adopted.

[0029] In an alternative embodiment, the core 10 includes an aluminum stranded wire 11, a semi-conductive wrapping layer 12, a cross-linked polyethylene insulation layer 13 and a shielding layer 14. The semi-conductive wrapping layer 12 is wrapped around the outer wall of the aluminum stranded wire 11, and the cross-linked polyethylene insulation layer 13 is extruded on the outer wall of the semi-conductive wrapping layer 12.

[0030] The cross-linked polyethylene insulation layer has good heat resistance and can work at temperatures above 90 degrees Celsius for a long time. At the same time, it has good insulation performance and can withstand high working voltages and instantaneous short-circuit voltages, thus ensuring the safe and stable operation of the cable in a complex electrical environment.

[0031] The conductor of the core 10 is formed by stranding aluminum alloy wires. And during recycling, due to the same materials, it provides more operating space for recycling and reuse. Moreover, the aluminum stranded wire has a lighter weight and good electrical conductivity, which can improve the comprehensive performance of the cable.

[0032] Furthermore, the shielding layer 14 includes a longitudinally wrapped copper tape layer, which is wrapped around the outer wall of the cross-linked polyethylene insulation layer 13. In this way, by using the copper tape as the shielding layer, a good shielding effect can be formed, making the electric field outside the cross-linked polyethylene insulation layer 13 uniform. And the copper tape can separate the insulation layer and the filling layer, avoiding the difficulty of peeling due to adhesion during later recycling.

[0033] Furthermore, the filling component 20 is filled around the core 10 and forms a cable core with a cross-section of a quasi-triangular structure. The outer contour surface of the cable core includes three straight segments and three arc segments. The three arc segments correspond to the position of the core 10, and the three straight segments correspond to the position between two cores 10. In this way, the filling component 20 can fill the gaps between the cores 10 and make the cross-sectional shape of the whole cable dense, and the external contour forms a quasi-triangular structure.

[0034] Among them, the filling component 20 includes a filling strip 21 and a filling layer 22, which are respectively filled in different areas inside the cable core: the filling strip 21 is arranged at the middle position of the three cores 10, and the filling layer 22 is arranged on the outer walls of the three cores 10.

[0035] Among them, a tensile composite steel wire bundle 30 is provided inside the filling strip 21, which is formed by stranding fine steel wires and glass fiber filaments / aramid fiber filaments. By adopting a lightweight and flame-retardant design, on the one hand, the lightweight tensile composite steel wire bundle 30 improves the tensile performance of the cable. Especially when the cable sways and swings under the action of wind, the tensile stress on the core 10 can be reduced. On the other hand, the flame-retardant performance of the cable is improved.

[0036] Optionally, the tensile composite steel wire bundle 30 is arranged at the central position inside the filling strip 21, and the outer circumcircle diameter of the tensile composite steel wire bundle 30 is smaller than the inscribed circle diameter of the filling strip 21.

[0037] As an optional implementation manner, the tensile composite steel wire bundle 30 includes a composite stranded steel wire structure formed by stranding multiple fine steel wires with a diameter range of 0.5 - 1 mm and glass fiber filaments / aramid fiber filaments, and the usage ratio of the two is 1:(1 - 2)

[0038] Such as Figure 2As shown, the filling strip 21 is configured to include three concave arc surfaces, and the three arc surfaces are respectively attached to the outer walls of the corresponding wire cores 10. The filling layer 22 covers the outer walls of the three wire cores 10 and the filling strip 21, and fills the gaps between the wire cores 10 and the filling strip 21. The connection between the filling layer 22 and the filling strip 21 is at the connection line of the axes of two adjacent wire cores 10.

[0039] In this way, the filling layer 22 is made dense, reducing the air gaps inside the cable.

[0040] In an alternative embodiment, the PVC materials used for the filling strip 21 and the filling layer 22 are reprocessed from recycled PVC sheath materials. The filling layer has low requirements for the electrical properties of the materials, and the use of recycled materials can meet the usage requirements. At the same time, the production of the cable is more in line with the concepts of environmental protection and sustainable production. Among them, the filling layer 22 is a foamed PVC extrusion layer, and the filling strip 21 is a PVC extrusion strip.

[0041] Furthermore, the composite wrapping layer 40 covers the outer wall of the filling component 20, and the outer sheath 50 is extruded on the outer wall of the composite wrapping layer 40.

[0042] Optionally, the composite wrapping layer 40 includes a wrapping tape body. The wrapping tape body includes a first structural layer and a second structural layer. The first structural layer includes a fiberglass tape layer, and the second structural layer includes an aramid braided layer. The fiberglass tape layer and the aramid braided layer are adhesively fixed.

[0043] Preferably, the wrapping overlap rate of the wrapping tape body is 50% - 70%.

[0044] In this way, by covering the outer layer of the filling component 20 with the composite wrapping layer 40, the flame retardant performance of the cable core can be improved, and at the same time, the integrity of the three wire cores 10 is better. The aramid braided layer also plays a tensile load-bearing role, avoiding large stresses on the filling component 20 and the outer sheath 50.

[0045] Combining the above embodiments, the overall shape of the insulated processing cable proposed by the present utility model is set as a triangular-like structure, which has the advantages of good wind resistance and less use of cable materials. The conductor used for the wire core is an aluminum alloy stranded structure. The lightweight tensile load-bearing composite steel strand structure is arranged between the three wire cores. Cooperating with the composite wrapping layer covering the cable core, good tensile and flame retardant effects can be formed. The filling layer uses a recycled sheath material structure, and the cable structure design is conducive to later recycling and reuse, which is in line with the concept of environmental protection production.

[0046] Although the present utility model has been disclosed above with preferred embodiments, it is not intended to limit the present utility model. Those with ordinary knowledge in the technical field to which the present utility model belongs can make various modifications and refinements without departing from the spirit and scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to what is defined by the claims.

Claims

1. A flame-retardant, temperature-resistant and environmentally friendly aerial insulated cable, characterized in that, Comprising: Multiple core wires (10) distributed in a triangular shape; A filling component (20), filled around the core wires (10) and forming a cable core with a cross-section of a quasi-triangular structure. The outer contour surface of the cable core includes three straight line segments and three arc segments. The three arc segments correspond to the positions of the core wires (10), and the three straight line segments correspond to the positions between two core wires (10); A composite wrapping layer (40), wrapped around the outer wall of the filling component (20); An outer sheath (50), extruded around the outer wall of the composite wrapping layer (40); Wherein, the filling component (20) includes filling strips (21) and a filling layer (22), and are respectively arranged in different regions of the cable core: the filling strips (21) are arranged at the middle positions of the three core wires (10), and the filling layer (22) is arranged on the outer walls of the three core wires (10); A tensile composite steel wire bundle (30) is provided in the filling strip (21), and the tensile composite steel wire bundle (30) is configured to be formed by stranding fine steel wires with glass fiber filaments / aramid fiber filaments.

2. The flame-retardant, temperature-resistant and environment-friendly aerial insulated cable according to claim 1, wherein, The filling strip (21) is configured to include three concave arc surfaces, and the three arc surfaces are respectively attached to the outer walls of the corresponding core wires (10).

3. The flame-retardant, temperature-resistant and environment-friendly aerial insulated cable according to claim 1, wherein The tensile composite steel wire bundle (30) is arranged at the central position in the filling strip (21), and the outer circumscribed circle diameter of the tensile composite steel wire bundle (30) is smaller than the inscribed circle diameter of the filling strip (21).

4. The flame-retardant, temperature-resistant and environment-friendly aerial insulated cable according to claim 1, characterized in that, The filling layer (22) is wrapped around the outer walls of the three core wires (10) and the filling strip (21), and fills the gaps between the core wires (10) and the filling strip (21). The connection between the filling layer (22) and the filling strip (21) is at the connection line of the axes of two adjacent core wires (10).

5. The flame-retardant, temperature-resistant and environment-friendly overhead insulated cable according to claim 1, characterized in that, Both the filling strip (21) and the filling layer (22) are made of polyvinyl chloride filler.

6. The flame-retardant, temperature-resistant and environment-friendly aerial insulated cable according to claim 1, wherein, The tensile composite steel wire bundle (30) includes a composite steel strand structure formed by stranding multiple fine steel wires with a diameter range of 0.5 - 1 mm with glass fiber filaments / aramid fiber filaments, and the usage ratio of the two is 1:(1 - 2).

7. The flame-retardant, temperature-resistant and environment-friendly aerial insulated cable according to claim 1, wherein The core wire (10) includes an aluminum stranded wire (11), a semi-conductive wrapping layer (12), a cross-linked polyethylene insulation layer (13), and a shielding layer (14). The semi-conductive wrapping layer (12) is wrapped around the outer wall of the aluminum stranded wire (11), and the cross-linked polyethylene insulation layer (13) is extruded around the outer wall of the semi-conductive wrapping layer (12).

8. The flame-retardant, temperature-resistant and environment-friendly aerial insulated cable according to claim 7, characterized in that, The shielding layer (14) includes a longitudinally wrapped copper tape layer, and the longitudinally wrapped copper tape layer is wrapped around the outer wall of the cross-linked polyethylene insulation layer (13).

9. The flame-retardant, temperature-resistant and environment-friendly aerial insulated cable according to any one of claims 1-8, characterized in that The composite wrapping layer (40) includes a wrapping tape body, the wrapping tape body includes a first structural layer and a second structural layer, the first structural layer includes a glass fiber tape layer, the second structural layer includes an aramid braided layer, and the glass fiber tape layer and the aramid braided layer are adhesively fixed.

10. The flame-retardant, temperature-resistant and environment-friendly aerial insulated cable according to claim 9, characterized in that, The wrapping overlap rate of the wrapping tape body is 50% - 70%.

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