Anti-snow overhead cable

Abstract

The utility model relates to an anti-snow overhead cable, which comprises an inner core, a protective layer and an anti-snow structure, according to the technical key points, the snow accumulation prevention structure comprises a heat insulation layer arranged on the periphery of the protection layer in a sleeving mode, a plurality of axial protruding edges evenly arranged on the periphery of the heat insulation layer, a first thermal expansion layer fixed to the top faces of the axial protruding edges and concentric with the heat insulation layer, and a second thermal expansion layer located on the outer side of the first thermal expansion layer and concentric with the first thermal expansion layer; the first thermal expansion layer, the second thermal expansion layer, the heat insulation layer, the heat insulation layer, the first thermal expansion layer, the second thermal expansion layer, the heat insulation layer, the heat insulation layer, the heat insulation layer, the heat insulation layer, the heat insulation layer and the first thermal expansion layer are sequentially arranged from top to bottom, and the axial connecting strips are connected between the first thermal expansion layer and the second thermal expansion layer. And a hydrophobic coating is arranged on the outer surface of the second thermal expansion layer. The snow-accumulation-preventing overhead power cable solves the problem that the surface shape of an existing snow-accumulation-preventing overhead power cable causes large swing amplitude of the cable in strong wind weather, prolongs the service life of the cable, and is low in production difficulty and high in production efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of cable structures, in particular to an overhead cable that prevents snow accumulation. Background Art

[0002] In power transmission equipment, overhead cables are indispensable and are often used for power transmission and distribution. They are characterized by being suspended in the air, rather than buried underground or installed in pipelines, and play an important role in power transmission and distribution and grid construction. Traditional overhead cables are generally circular in cross-section. In winter, when it is snowy and windy, a large amount of snow easily accumulates on the upper surface, resulting in increased line weight. When the amount of snow exceeds the cable's bearing capacity, it is easy to cause the cable to break or the transmission tower or pole to tilt. In order to avoid snow accumulation on the cable surface, some snow-proof cables have also appeared in the prior art.

[0003] For example, CN118366720A discloses an anti-snow overhead power cable, which includes a conductor, an insulator and a spine. The conductor is composed of a number of unannealed hard copper wires, which are twisted to form a circle. The insulator is located on the outside of the conductor, and the spine is located on the outside of the insulator. The spine is symmetrically arranged in a fin shape, and a heating component is arranged inside the insulator. The cable is intended to prevent snow accumulation by automatically sliding off the cable through the special structure of the fin-shaped spine. However, the following problems still exist during use: 1. The fin-shaped spine causes the cable to swing greatly in strong winds, which can easily cause the cable to break and shorten the service life of the cable; 2. The expansion effect of the thermal expansion material is used to expand the ball outward, which is intended to achieve an ice-breaking effect, but this structural design is not easy to implement and is difficult to produce. Summary of the invention

[0004] The purpose of the utility model is to provide an anti-snow overhead cable with a reasonable structure and reliable use, so as to solve the problem that the surface shape of the existing anti-snow overhead power cable causes the cable to swing greatly in strong wind weather, avoid the cable from breaking, and extend the service life of the cable. At the same time, the production difficulty is small and the production efficiency is high.

[0005] The technical solution of the utility model is:

[0006] A snow-proof overhead cable comprises an inner core, a protective layer arranged on the outer periphery of the inner core, and a snow-proof structure arranged on the outer periphery of the protective layer. The technical key points are as follows: the snow-proof structure comprises a heat-insulating layer sleeved on the outer periphery of the protective layer, a plurality of axial ridges uniformly arranged on the outer periphery of the heat-insulating layer, a first thermal expansion layer fixed to the top surface of each axial ridge and concentric with the heat-insulating layer, a second thermal expansion layer located outside the first thermal expansion layer and concentric with the first thermal expansion layer, a plurality of axial connecting strips connected between the first thermal expansion layer and the second thermal expansion layer, a plurality of thermal expansion heat-conducting strips connected between the thermal insulation layer and the first thermal expansion layer, and a heating conductor arranged in the thermal expansion heat-conducting strips, the number of the axial connecting strips is equal to the number of the axial ridges and corresponds one to one, the number of the thermal expansion heat-conducting strips is equal to the number of the axial ridges and is staggered with the axial ridges, the thickness of the first thermal expansion layer is greater than the thickness of the second thermal expansion layer, and the outer surface of the second thermal expansion layer is provided with a hydrophobic coating.

[0007] In the above-mentioned snow-proof overhead cable, the thermal expansion heat-conducting strip extends axially along the thermal insulation layer, and the height of the thermal expansion heat-conducting strip is equal to the height of the axial convex ridge.

[0008] In the above-mentioned snow-proof overhead cable, the angles between the thermal expansion heat-conducting strip and two adjacent axial convex ridges are equal.

[0009] The above-mentioned snow-proof overhead cable, the inner core includes a plurality of signal transmission conductors, a filler arranged between the protective layer and the signal transmission conductors, and an insulating layer arranged between the signal transmission conductors and the filler.

[0010] The beneficial effects of the utility model are:

[0011] 1. When it snows, the heating conductor generates heat after taking power. The heat expansion conductive strip expands radially due to the heat and transfers the heat to the first heat expansion layer. The first heat expansion layer then transfers the heat to the second heat expansion layer. The second heat expansion layer between the two adjacent axial connecting strips expands radially, heating the ice and snow accumulated on the surface while "breaking" the frozen layer. The hydrophobic coating is then used to make the ice and snow slide off the surface of the cable, thereby preventing snow accumulation.

[0012] 2. The outer peripheral surface of the utility model is circular in the unheated state. Compared with the prior art, it solves the problem that the surface shape of the existing snow-proof overhead power cable causes the cable to swing greatly in strong wind weather, avoids cable breakage, and extends the service life of the cable. At the same time, it has low production difficulty and high production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 It is a left view of the utility model;

[0015] Figure 3 yes Figure 1 Enlarged view of part A in the middle;

[0016] Figure 4 yes Figure 2 Enlarged view of part B in the middle.

[0017] In the figure: 1. second thermal expansion layer, 2. first thermal expansion layer, 3. axial ridge, 4. thermal expansion heat conductive strip, 5. axial connecting strip, 6. heating conductor, 7. thermal insulation layer, 8. protective layer, 9. filler, 10. insulating layer, 11. signal transmission conductor, 12. hydrophobic coating. DETAILED DESCRIPTION

[0018] The utility model is described in detail according to the accompanying drawings of the specification.

[0019] like Figure 1 to Figure 4 As shown, the snow-proof overhead cable comprises an inner core, a protective layer 8 arranged on the periphery of the inner core, and a snow-proof structure arranged on the periphery of the protective layer 8. The inner core comprises a plurality of signal transmission conductors 11, a filler 9 arranged between the protective layer 8 and the signal transmission conductors 11, and an insulating layer 10 arranged between the signal transmission conductors 11 and the filler 9.

[0020] Among them, the anti-snow structure includes an insulation layer 7 sleeved on the outer periphery of the protective layer 8, a plurality of axial ridges 3 evenly arranged on the outer periphery of the insulation layer 7, a first thermal expansion layer 2 fixed to the top surface of each axial ridge 3 and concentric with the insulation layer 7, a second thermal expansion layer 1 located outside the first thermal expansion layer 2 and concentric, a plurality of axial connecting strips 5 connected between the first thermal expansion layer 2 and the second thermal expansion layer 1, a plurality of thermal expansion conductive strips 4 connected between the insulation layer 7 and the first thermal expansion layer 2, and a heating conductor 6 arranged in the thermal expansion conductive strip 4.

[0021] The number of the axial connecting strips 5 is equal to the number of the axial ribs 3 and corresponds one to one. The number of the thermal expansion conductive strips 4 is equal to the number of the axial ribs 3 and is arranged alternately with the axial ribs 3. The thickness of the first thermal expansion layer 2 is greater than the thickness of the second thermal expansion layer 1. The thermal expansion conductive strips 4 extend axially along the heat insulation layer 7, and the height of the thermal expansion conductive strips 4 is equal to the height of the axial ribs 3. The angles between the thermal expansion conductive strips 4 and two adjacent axial ribs 3 are equal.

[0022] The outer surface of the second thermal expansion layer 1 is provided with a hydrophobic coating 12 .

[0023] Working principle:

[0024] The heating conductor 6 generates heat after receiving electricity, and the heat expansion heat-conducting strip 4 radially expands due to the heat and transfers the heat to the first heat expansion layer 2, and the first heat expansion layer 2 transfers the heat to the second heat expansion layer 1. The second heat expansion layer 1 between two adjacent axial connecting strips 5 expands radially, heating the ice and snow accumulated on the surface while "breaking" the frozen layer, and then the hydrophobic coating 12 is used to make the ice and snow slide off the surface of the cable, thereby achieving the effect of preventing snow accumulation.

[0025] The second thermal expansion layer 1 is a retractable structure, which expands when heated and contracts when cooled. When working, a plurality of heating air cavities are formed between the first thermal expansion layer 2 and the first thermal expansion layer 1. After snow removal, the second thermal expansion layer 1 loses heat and resets itself, and the outer peripheral surface remains circular, thereby preventing the cable from swinging violently when strong winds strike.

[0026] The above embodiments of the present invention are described in detail, but the above contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. An anti-snow overhead cable, comprising an inner core, a protective layer arranged on the periphery of the inner core, and an anti-snow structure arranged on the periphery of the protective layer, characterized in that: The anti-snow structure includes a heat-insulating layer sleeved on the outer periphery of the protective layer, a plurality of axial ridges uniformly arranged on the outer periphery of the heat-insulating layer, a first thermal expansion layer fixed to the top surface of each axial ridge and concentric with the heat-insulating layer, a second thermal expansion layer located outside the first thermal expansion layer and concentric, a plurality of axial connecting strips connected between the first thermal expansion layer and the second thermal expansion layer, a plurality of thermal expansion heat-conducting strips connected between the heat-insulating layer and the first thermal expansion layer, and a heating conductor arranged in the thermal expansion heat-conducting strips, the number of the axial connecting strips is equal to the number of the axial ridges and corresponds one to one, the number of the thermal expansion heat-conducting strips is equal to the number of the axial ridges and is staggered with the axial ridges, the thickness of the first thermal expansion layer is greater than the thickness of the second thermal expansion layer, and the outer surface of the second thermal expansion layer is provided with a hydrophobic coating.

2. The snow-proof overhead cable according to claim 1, characterized in that: The thermal expansion heat conduction strip extends axially along the heat insulation layer, and the height of the thermal expansion heat conduction strip is equal to the height of the axial convex ridge.

3. The snow-proof overhead cable according to claim 1, characterized in that: The included angles between the thermal expansion heat conducting strip and two adjacent axial convex edges are equal.

4. The snow-proof overhead cable according to claim 1, characterized in that: The inner core comprises a plurality of signal transmission conductors, a filler arranged between the protection layer and the signal transmission conductors, and an insulating layer arranged between the signal transmission conductors and the filler.

Images