Frozen soil layer anti-freezing cable laying structure

Abstract

The utility model relates to a frozen soil layer anti-freezing cable laying structure, and belongs to the field of cable anti-freezing, and the structure comprises an inner sleeve which is used for the penetration of a cable core, and the cable core is wrapped in the inner sleeve through thermal insulation cotton; the first middle sleeve is arranged on the periphery of the inner sleeve in a sleeving manner; the second middle sleeve is arranged on the periphery of the first middle sleeve in a sleeving mode. The heating wire is arranged between the first middle sleeve and the second middle sleeve and is wound on the outer wall of the first middle sleeve; the outer sleeve is arranged on the periphery of the second middle sleeve in a sleeving mode, a cavity is formed between the outer sleeve and the second middle sleeve and used for allowing the power line to penetrate through, the two ends of the heating wire penetrate through the second middle sleeve to be connected with the power line, and the heating wire is connected with the power line, so that when a certain section of heating wire breaks down, normal work of other heating wires is not affected; only whether each section of the heating wire is short-circuited or open-circuited is detected, the detection time is shortened, the detection efficiency is improved, the heating wire is connected with the power supply line in an inserted mode, the heating wire is convenient to disassemble and replace, and operation is rapid and convenient.

Description

Technical Field

[0001] This utility model relates to the field of cable antifreeze, and in particular to a cable laying structure for preventing freezing in frozen soil. Background Technology

[0002] In power engineering cable laying, cable frost protection must be considered, especially in colder regions with permafrost. In such environments, cables need to be buried below the permafrost layer. However, if the permafrost layer is too deep, direct burial involves a large amount of excavation work, so direct burial is generally not recommended. Instead, cable laying within the permafrost layer is considered, but anti-freezing measures are taken. Existing technologies for anti-freezing measures for cables in permafrost layers mainly include: first, using anti-freezing coatings, applying special anti-freezing coatings to the outer layer of the cable insulation to enhance the cable's anti-freezing performance; and second, maintaining the cable temperature through electric heating to prevent freezing. Electric heating is a relatively effective method for preventing freezing. For example, in an antifreeze cable disclosed in patent CN113096869A, a heating wire is used to maintain the core temperature and prevent freezing. However, the above-mentioned patented technology also has its shortcomings. Because the cable is laid underground, the heating wire circuit may become damp and short-circuit or open-circuit due to moisture in the soil, making the heating wire prone to failure. Currently, the connection of the heating wire in the existing antifreeze structure of cable laying is very difficult to detect, so it is not possible to determine which section of the line is faulty. It may be necessary to test the entire line, which is not only labor-intensive but also very slow. Utility Model Content

[0003] Currently, while existing electric heating antifreeze measures offer good heating effects, they suffer from poor stability and durability, and are prone to failure. Furthermore, the aforementioned patented technology presents significant challenges in detecting heating wire faults, potentially requiring inspection of the entire circuit, which is not only labor-intensive but also extremely slow. This application addresses at least one aspect or objective of these problems by designing an anti-freezing cable laying structure for permafrost layers. The specific technical solution adopted is as follows:

[0004] A structure for laying cables in frozen soil to prevent freezing includes:

[0005] The inner sleeve is used to thread the wire core, which is wrapped in the inner sleeve with insulation cotton.

[0006] The first intermediate sleeve is sleeved around the inner sleeve;

[0007] The second intermediate sleeve is sleeved around the first intermediate sleeve;

[0008] Heating wire, the heating wire is disposed between the first intermediate sleeve and the second intermediate sleeve, and the heating wire is wound around the outer wall of the first intermediate sleeve;

[0009] The outer sleeve is fitted around the second intermediate sleeve. There is a cavity between the outer sleeve and the second intermediate sleeve. A power supply wire is threaded through the cavity. The two ends of the heating wire pass through the second intermediate sleeve and are connected to the power supply wire.

[0010] Preferably, both ends of the heating wire are connected to the power supply line via cable connectors.

[0011] Preferably, the outer sleeve and the first intermediate sleeve are stainless steel pipes, the outer wall of the first intermediate sleeve is coated with an insulating layer, and the inner sleeve and the second intermediate sleeve are plastic pipes.

[0012] Preferably, the outer tube is provided with a vacuum chamber, which is arranged around the circumference of the outer tube.

[0013] Preferably, the outer casing is coated with an anti-corrosion layer.

[0014] Preferably, the outer wall of the outer sleeve is wrapped with a rubber layer.

[0015] Preferably, the space between the inner sleeve and the first intermediate sleeve is filled with thermal insulation sponge.

[0016] Preferably, the outer sleeve and the second intermediate sleeve are fixed together by an insert.

[0017] This invention connects the heating wire to the power supply line. When a section of the heating wire fails, it does not affect the normal operation of other heating wires. It only requires checking whether each section of the heating wire is short-circuited or open-circuited, which shortens the detection time and improves the detection efficiency. Once a section of the heating wire is detected to be faulty, it is easy to disassemble and replace the heating wire because the heating wire is connected to the power supply line through a cable connector. The operation is quick and convenient. Attached Figure Description

[0018] Figure 1 This is the left view of the present invention;

[0019] Figure 2 This is the front view of the present invention.

[0020] In the diagram, 1. Inner sleeve, 2. First intermediate sleeve, 3. Second intermediate sleeve, 4. Outer sleeve, 5. Rubber layer, 6. Vacuum cavity, 7. Insert, 8. Heating wire, 9. Insulating sponge, 10. Insulating cotton, 11. Wire core, 12. Power supply wire, 13. Cavity, 14. Cable connector. Detailed Implementation

[0021] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0022] Furthermore, in the description of this invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] like Figure 1-2 As shown, a cable laying structure for freezing protection in permafrost includes an inner sleeve 1, a first intermediate sleeve 2, a second intermediate sleeve 3, a heating wire 8, and an outer sleeve 4. The inner sleeve 1 is used to thread the wire core 11, which is wrapped in the inner sleeve 1 by insulation cotton 10. There can be multiple wire cores 11, which are threaded through the inner sleeve 1 simultaneously. The first intermediate sleeve 2 is fitted around the inner sleeve 1, and the second intermediate sleeve 3 is fitted around the first intermediate sleeve 2. The heating wire 8 is provided between the first intermediate sleeve 2 and the second intermediate sleeve 3. The heating wire 8 is wound around the outer wall of the first intermediate sleeve 2, from one end of the first intermediate sleeve 2 to the other end. The heating wire 8 heats and maintains the temperature of the wire core 11 in the permafrost layer, avoiding deformation due to low temperature and breakage under external force.

[0024] An outer sleeve 4 is provided around the second intermediate sleeve 3. There is a cavity 13 between the outer sleeve 4 and the second intermediate sleeve 3. The cavity 13 is used for the power supply line 12. The outer sleeve 4 and the second intermediate sleeve 3 can be fixed by the insert 7. The two ends of the heating wire 8 are connected to the power supply line 12. Specifically, there are two power supply lines 12. The two ends of the heating wire 8 are connected to the two power supply lines 12 respectively. The power supply line 12 can be connected to external power supply equipment (such as photovoltaic panels or power towers). Of course, in order to facilitate the control of the working status of the heating wire 8 and the replacement of the heating wire 8, a switch can be set between the power supply equipment and the power supply line 12 through conventional design to achieve independent control.

[0025] Furthermore, to facilitate the replacement of the heating wire 8, both ends of the heating wire 8 are connected to the power supply line 12 via cable connectors 14. Direct plugging allows for quick connection and disconnection, shortening replacement time and increasing replacement speed.

[0026] Furthermore, the outer sleeve 4 and the first intermediate sleeve 2 are stainless steel pipes, while the inner sleeve 1 and the second intermediate sleeve 3 are plastic pipes. The outer sleeve 4 is made of stainless steel to improve the mechanical strength of the cable laying, resist the squeezing pressure generated when the soil freezes and expands, and prevent the cable from being damaged. It plays a good protective role, especially when passing through frozen soil areas. The first intermediate sleeve 2 is made of stainless steel mainly to improve the thermal conductivity. At the same time, in order to prevent the heating wire 8 from conducting electricity with the first intermediate sleeve, an insulating layer is coated on the outer wall of the first intermediate sleeve to transfer the heat emitted by the heating wire 8 to the inner sleeve 1 and insulate the wire core 11.

[0027] Furthermore, in order to reduce heat dissipation from the outer sleeve 4, the outer sleeve 4 is provided with a vacuum chamber 6, which is arranged around the circumference of the outer sleeve 4.

[0028] Furthermore, due to the high moisture content and humidity of the permafrost layer, an anti-corrosion layer is sprayed on the outer surface of the outer casing 4 to reduce corrosion.

[0029] Furthermore, in order to reduce the transfer of low temperatures from the external environment to the outer jacket 4, a rubber layer 5 is wrapped around the outer wall of the outer jacket 4.

[0030] Furthermore, regarding the specific fixation between the inner sleeve 1 and the first intermediate sleeve 2, a heat-insulating sponge 9 is filled between the inner sleeve 1 and the first intermediate sleeve 2. The heat-insulating sponge 9 serves two purposes: firstly, it provides heat insulation, and secondly, it fills the space between the inner sleeve 1 and the first intermediate sleeve 2, thus fixing the inner sleeve 1 and the first intermediate sleeve 2.

[0031] The above specific embodiments should not be construed as limiting the scope of protection of this utility model. For those skilled in the art, any alternative improvements or modifications made to the embodiments of this utility model shall fall within the scope of protection of this utility model.

[0032] Any aspects of this utility model not described in detail are known to those skilled in the art.

Claims

1. A structure for laying cables in frozen soil to prevent freezing, characterized in that, include: An inner sleeve is used to thread the wire core, which is wrapped in the inner sleeve with insulation cotton. A first intermediate sleeve is fitted around the outer periphery of the inner sleeve; The second intermediate sleeve is sleeved around the first intermediate sleeve; A heating wire is disposed between the first intermediate sleeve and the second intermediate sleeve, and the heating wire is wound around the outer wall of the first intermediate sleeve. The outer sleeve is fitted around the second intermediate sleeve, and there is a cavity between the outer sleeve and the second intermediate sleeve. A power supply wire is threaded through the cavity, and the two ends of the heating wire pass through the second intermediate sleeve and are connected to the power supply wire.

2. The anti-freezing cable laying structure in frozen soil as described in claim 1, characterized in that, The two ends of the heating wire are connected to the power supply line via cable connectors.

3. A structure for laying anti-freezing cables in frozen soil as described in claim 1 or 2, characterized in that, The outer sleeve and the first intermediate sleeve are stainless steel tubes, the outer wall of the first intermediate sleeve is coated with an insulating layer, and the inner sleeve and the second intermediate sleeve are plastic tubes.

4. The anti-freezing cable laying structure in frozen soil as described in claim 3, characterized in that, The outer tube is provided with a vacuum chamber, which is arranged around the circumference of the outer tube.

5. The anti-freezing cable laying structure in frozen soil as described in claim 3, characterized in that, The outer sleeve is coated with an anti-corrosion layer.

6. The anti-freezing cable laying structure in frozen soil as described in claim 5, characterized in that, The outer wall of the outer sleeve is wrapped with a rubber layer.

7. The anti-freezing cable laying structure in frozen soil as described in claim 1, characterized in that, The space between the inner sleeve and the first intermediate sleeve is filled with thermal insulation sponge.

8. The anti-freezing cable laying structure in frozen soil as described in claim 1, characterized in that, The outer sleeve and the second intermediate sleeve are fixed together by an insert.

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