Monocrystal copper conductor fireproof rat-proof cable

Abstract

The utility model discloses a single crystal copper conductor fire-resistant rat-proof cable, which comprises a cable core and a sheath wrapped on the outer layer of the cable core, the cable core comprises a plurality of wire cores and fillers, the fillers are filled in gaps among the wire cores, the wire cores are medium-voltage wire cores, and the fillers are filled in the gaps among the wire cores. The structure of the sheath sequentially comprises an isolation layer, a heat insulation layer, a metal layer, an oxygen insulation layer, a fire insulation layer and an outer protection layer from inside to outside, and the metal layer is a rat-proof metal layer. The utility model is reasonable in structural design, and has the following beneficial effects: the selected special-shaped single crystal copper conductor has good conductivity, the contact resistance can be further reduced, and the current transmission efficiency can be improved. The heat insulation layer is an aerogel composite belt heat insulation layer and can effectively isolate high temperature, when the external temperature is 850 DEG C flame temperature, flame and temperature are blocked through the external fire insulation layer, the oxygen insulation layer, the metal layer and other structures together, and finally the surface temperature of the inner side cable core can be lower than 150 DEG C. And the welding corrugated copper sheath is arranged, so that corrosion resistance, rat resistance, water resistance, fire resistance, pressure resistance and the like can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a fire-resistant and rat-proof cable with a single crystal copper conductor. Background Art

[0002] A cable is a device for transmitting electrical energy or signals. It typically consists of several or several groups of conductors, with internal current flow and external insulation. Cables can be used to transmit electrical (magnetic) energy and information, enabling electromagnetic energy conversion. They are widely used in urban underground power grids, power station outgoing lines, internal power supplies for industrial and mining enterprises, and underwater transmission lines across rivers and seas. There are many types of cables, including power cables, control cables, compensation cables, shielded cables, and high-temperature cables. They consist of single or multiple conductors and insulation, and are used to connect circuits and electrical appliances.

[0003] Power cables play a vital role in power transmission and distribution in modern society. However, in some usage scenarios, traditional cables face some problems and challenges.

[0004] On the one hand, ordinary cables are easily gnawn by rats during use. The gnawing of rats not only leads to the decline of the power transmission performance of the cable, but also may cause safety hazards such as short circuits, seriously threatening the stable operation of the power system.

[0005] On the other hand, for some medium-voltage power transmission scenarios, cables need to have good fire resistance to maintain power transmission for a certain period of time in emergency situations such as fire, buying time for personnel evacuation and equipment protection. Utility Model Content

[0006] The purpose of the utility model is to provide a single crystal copper conductor fire-resistant and rat-proof cable, which is not only rat-proof but also has good fire resistance under medium voltage power transmission.

[0007] In order to achieve the above-mentioned purpose, the technical solution of the present invention provides a single crystal copper conductor fire-resistant and rat-proof cable, comprising a cable core and a sheath wrapped around the outer layer of the cable core, the cable core comprising several wire cores and fillers, the fillers filling the gaps between the wire cores, the wire core being a medium voltage wire core, the structure of the sheath from inside to outside being an isolation layer, a thermal insulation layer, a metal layer, an oxygen insulation layer, a fire insulation layer, and an outer protective layer, the metal layer being a welded corrugated copper sheath, and the thermal insulation layer being an aerogel composite tape.

[0008] Furthermore, the structure of the wire core is, from inside to outside, a conductor, a first shielding layer, an insulating layer, an insulating shielding layer, and a second shielding layer.

[0009] Furthermore, the number of the wire cores is 3, and the 3 wire cores are symmetrically arranged.

[0010] Furthermore, the cable core also includes a wrapping layer, which is arranged outside the core and wraps and fixes the positions of several cores; the wrapping layer is a low-smoke, halogen-free and highly flame-retardant tape.

[0011] Furthermore, the conductor is a special-shaped single-crystal copper conductor, which is formed by twisting and pressing multiple special-shaped single-crystal copper wires; the first shielding layer is a semi-conductive shielding layer for cross-linked conductors, with a thickness of 0.7mm±0.1mm; the insulating layer is a polypropylene insulation layer of 35kV and below, with a thickness of 10.5mm±0.5mm; the insulating shielding layer is an ultra-smooth semi-conductive shielding layer for cross-linked cables, with a thickness of 0.8mm±0.1mm; the first shielding layer, insulating layer, and insulating shielding layer are a three-layer co-extrusion structure; the second shielding layer is a copper tape shielding layer.

[0012] Furthermore, the filler is a heat-resistant glass fiber filler.

[0013] Furthermore, the isolation layer is a halogen-free low-smoke polyolefin layer.

[0014] Furthermore, the oxygen barrier layer is a ceramic polyolefin oxygen barrier layer.

[0015] Furthermore, the fire-insulating layer is a low-smoke, halogen-free, highly flame-retardant tape; and the outer protective layer is a halogen-free, low-smoke polyolefin layer.

[0016] Furthermore, the cross-section of the wire core and the cable core is circular.

[0017] In summary, the device structure of the present invention is reasonably designed, and the use of the technical solution of the present invention has the following beneficial effects:

[0018] 1. The use of special-shaped single crystal copper conductors as the conductive core in medium voltage lines not only has good conductivity, but the special-shaped structure and twisted compression method can further reduce contact resistance and improve current transmission efficiency.

[0019] 2. The thermal insulation layer utilizes aerogel composite tape. This aerogel has a unique nano-scale porous structure that not only effectively blocks air convection, reduces thermal radiation and conduction, but also effectively isolates the inner cable core from high temperatures. When the external temperature reaches 850°C, the flame temperature is blocked by the external fire barrier, oxygen barrier, and metal layer. Ultimately, the heat source is isolated by the aerogel composite tape insulation layer, keeping the inner cable core surface temperature below 150°C.

[0020] 3. A welded corrugated copper sheath is used to effectively protect the cable from damage caused by external physical, chemical, and electrical factors. It is corrosion-resistant, rodent-proof, waterproof, fire-resistant, and pressure-resistant. It meets the market's high fire resistance requirements while also being rodent-proof. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the cross-sectional structure of the utility model single crystal copper conductor fire-resistant and rodent-proof cable;

[0022] Explanation of the reference numerals: 1-conductor; 2-first shielding layer; 3-insulating layer; 4-insulating shielding layer; 5-second shielding layer; 6-filler; 7-wrapping layer; 8-isolating layer; 9-thermal insulation layer; 10-metal layer; 11-oxygen insulation layer; 12-fire insulation layer; 13-outer protective layer. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention, but this does not constitute a limitation on the protection scope of the present invention.

[0024] In this utility model, for a clearer description, the following explanation is made: the observer faces the Figure 1 For observation, the left front side of the observer is set as front, the right rear side of the observer is set as rear, the left rear side of the observer is set as left, the right front side of the observer is set as right, the top of the observer is set as top, and the bottom of the observer is set as bottom. It should be noted that the terms "front end", "rear end", "left side", "right side", "middle", "top", "bottom" and so on in the text indicate the direction or position relationship based on the direction or position relationship set in the drawings, which is only for the convenience of clearly describing the present invention, and does not indicate or imply that the structure or component referred to must have a specific direction or be constructed in a specific direction. Therefore, it cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", and "fourth" are only used for the purpose of clarifying or simplifying the description, and cannot be understood as indicating or implying relative importance or quantity.

[0025] See also Figure 1 The utility model provides a single crystal copper conductor fire-resistant and rat-proof cable, including a cable core and a sheath wrapped around the outer layer of the cable core. The cable core includes a plurality of wire cores and a filler 6. The filler 6 is filled in the gaps between the wire cores. The wire core is a medium-voltage wire core. The structure of the sheath from the inside to the outside is an isolation layer 8, a heat insulation layer 9, a metal layer 10, an oxygen insulation layer 11, a fire insulation layer 12, and an outer protective layer 13. The metal layer 10 is a rodent-proof metal layer.

[0026] As a preferred embodiment of the present invention, the structure of the core is conductor 1, first shielding layer 2, insulating layer 3, insulating shielding layer 4, and second shielding layer 5 from inside to outside; the number of cores is 3, and the 3 cores are symmetrically arranged.

[0027] Specifically, the cable core further includes a wrapping layer 7, which is arranged outside the core and wraps and fixes the positions of several cores; the wrapping layer 7 is a low-smoke, halogen-free and highly flame-retardant tape.

[0028] The wrapping layer 7 is made of low-smoke halogen-free and highly flame-retardant tape, which has the effect of tightening the cable core and preventing the outer isolation sleeve from being deformed by heat.

[0029] As a preferred embodiment of the present invention, the conductor 1 is a special-shaped single-crystal copper conductor, which is formed by twisting and pressing a plurality of special-shaped single-crystal copper wires; the first shielding layer 2 is a semi-conductive shielding layer for cross-linked conductors with a thickness of 0.7mm±0.1mm; the insulating layer 3 is a polypropylene insulation layer of 35kV and below with a thickness of 10.5mm±0.5mm; the insulating shielding layer 4 is an ultra-smooth semi-conductive shielding layer for cross-linked cables with a thickness of 0.8mm±0.1mm; the first shielding layer 2, the insulating layer 3, and the insulating shielding layer 4 are a three-layer co-extrusion structure; the second shielding layer 5 is a copper tape shielding layer.

[0030] The rounded conductor, formed by twisting and compacting multiple shaped single-crystal copper wires, offers excellent electrical conductivity, reduces skin effect, reduces space usage, improves electromagnetic compatibility, and enhances heat dissipation. While single-crystal copper itself has excellent electrical conductivity, the shaped structure and compacted twisting further reduce contact resistance and improve current transmission efficiency.

[0031] The first shielding layer 2, the insulating layer 3, and the insulating shielding layer 4 are extruded by a three-layer co-extrusion method, which improves safety and reliability while having strong anti-interference ability and good protection performance.

[0032] The use of phase-split copper tape shielding can protect external components from the influence of electromagnetic fields, suppress and reduce the leakage of electromagnetic radiation, improve anti-interference ability, and enhance safety performance.

[0033] Specifically, the filler 6 is a heat-resistant glass fiber filler.

[0034] It is filled with heat-resistant glass fiber and has the characteristics of good insulation, strong heat resistance, good corrosion resistance, high mechanical strength, excellent thermal insulation performance, good sound absorption properties, fire resistance reaching Class A, and good temperature resistance and stability.

[0035] Specifically, the isolation layer 8 is a halogen-free low-smoke polyolefin layer; and the thermal insulation layer 9 is an aerogel composite tape.

[0036] The isolation layer 8 is made of halogen-free low-smoke polyolefin material, which has the functions of protecting the internal wire core, enhancing flexibility, preventing entanglement, and providing insulation performance for the cable line, making it safer and more reliable.

[0037] The thermal insulation layer 9 utilizes an aerogel composite tape, which features a high specific surface area, high porosity, stable chemical properties, low thermal conductivity, high temperature resistance, a wide operating temperature range, and a long service life. This aerogel possesses a unique nanoscale porous structure that effectively blocks air convection, reduces thermal radiation and conduction, and effectively isolates the inner cable core from high temperatures. When the external temperature reaches 850°C, the flame is blocked by the external fire barrier layer 12, oxygen barrier layer 11, and metal layer 10. Ultimately, the heat source is isolated by the gel composite tape thermal insulation layer 9, and the inner cable core surface temperature remains below 150°C.

[0038] Specifically, the metal layer 10 is a welded corrugated copper sheath; and the oxygen-isolating layer 11 is a ceramic polyolefin oxygen-isolating layer.

[0039] The metal layer 10 utilizes a welded corrugated copper sheath, which is wear-resistant, corrosion-resistant, and offers excellent heat dissipation, fire resistance, and rodent-proof properties. This copper sheath effectively protects the cable interior from external physical, chemical, and electrical damage, and offers corrosion resistance, rodent resistance, waterproofing, fire resistance, and pressure resistance. This fire-resistant, heat-insulating, and rodent-proof structure boasts high production efficiency and meets market demand for high-quality fire-resistant products.

[0040] The oxygen-isolating layer 11 is made of ceramic polyolefin oxygen-isolating material, which can form a ceramic shell at high temperature, thereby preventing oxygen from entering and preventing fire from burning the interior.

[0041] Specifically, the fire-insulating layer 12 is a low-smoke, halogen-free, highly flame-retardant tape; and the outer protective layer 13 is a halogen-free, low-smoke polyolefin layer.

[0042] The fire-insulating layer 12 is made of low-smoke halogen-free high flame-retardant tape, which has the function of improving the flame-retardant ability of the cable, absorbing a large amount of heat, and forming a carbon shell layer to isolate the air and prevent the spread of fire.

[0043] The outer protective layer 13 is made of halogen-free low-smoke polyolefin material, which can prevent the cable from being damaged by physical, chemical, environmental and other factors during use, and ensure that the cable has long-term stable and reliable transmission performance and safety performance.

[0044] Specifically, the cross-sectional shape of the wire core and the cable core is circular.

[0045] The main features of this patented cable

[0046] 1. Single crystal copper conductor

[0047] Excellent electrical conductivity: Single crystal copper itself has good electrical conductivity, and the special-shaped structure and twisted and compacted method can further reduce contact resistance and improve current transmission efficiency; reduce skin effect, the special-shaped structure helps to reduce the impact of the skin effect, making the current more evenly distributed on the cross-section of the conductor, thereby improving the effective current carrying capacity of the conductor; reduce space occupation: compared with traditional round conductors, the special-shaped design can be arranged more compactly under the same cross-sectional area, which helps to reduce the size of the equipment and save space. Improve electromagnetic compatibility: Reasonable twisting and special-shaped design can optimize the electromagnetic field distribution around the conductor, thereby improving electromagnetic compatibility and reducing electromagnetic interference. Improve heat dissipation performance: The tight twisting and compaction structure helps to conduct and dissipate heat, enhance the heat dissipation capacity of the conductor, and ensure the working stability of the conductor under high current load.

[0048] 2. Insulation layer

[0049] The main features of thermal insulation aerogel composite tape include high specific surface area, high porosity, stable chemical properties, low thermal conductivity, high temperature resistance, a wide operating temperature range, and long life. This multifunctional material with a special microstructure and unique physical and chemical properties makes it an ideal thermal insulation material, capable of maintaining stable performance under extreme temperature conditions.

[0050] 3. Metal layer

[0051] The welded corrugated copper sheath is wear-resistant, corrosion-resistant, and offers excellent heat dissipation, fire resistance, and rodent-proof properties. It resists corrosion from a variety of chemicals and is suitable for use in harsh environments. The welded corrugated copper sheath provides a secure and reliable connection, enhancing overall structural stability and effectively protecting the cable core, ensuring the integrity of the line.

[0052] 4. Fire-resistant design

[0053] By using special fire-resistant materials, such as a flame-retardant layer made of cross-linked polyethylene, the heat resistance and insulation properties of the cable are enhanced, ensuring that it can maintain normal operation for a certain period of time in a high temperature environment.

[0054] 5. Rodent prevention measures

[0055] A welded corrugated copper sheath metal layer is provided to prevent mice from gnawing on the cable sheath, thereby improving the safety of the cable.

[0056] 6. Enhanced structure

[0057] A nylon layer can be added to the outer layer of the insulating shielding layer to increase the strength and stability of the cable.

[0058] Nylon layer

[0059] 1. Mechanical protection: Enhance the cable's tensile and abrasion resistance, and protect the internal conductor and insulation layer from damage caused by external mechanical stress.

[0060] 2. Moisture-proof and waterproof: prevent moisture from entering to a certain extent and maintain good insulation performance inside the cable.

[0061] 3. Improve the stability of the cable structure: It helps to maintain the shape and structural integrity of the cable, making it less likely to deform during installation and use.

[0062] 4. Increase the chemical corrosion resistance of the cable: It can resist the erosion of some chemical substances and extend the service life of the cable.

[0063] 5. Flame retardant effect: Some nylon materials have certain flame retardant properties, which can improve the safety of cables in fire situations.

[0064] These functions jointly ensure the stable, reliable and safe operation of medium voltage cables during power transmission.

[0065] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A single crystal copper conductor fire-resistant and rodent-proof cable comprising a cable core and a sheath wrapped around the outer layer of the cable core, characterized in that: The cable core includes several wire cores and fillers, and the fillers are filled in the gaps between the wire cores. The wire core is a medium-voltage wire core. The structure of the sheath is, from the inside to the outside, an isolation layer, a thermal insulation layer, a metal layer, an oxygen insulation layer, a fire insulation layer, and an outer protective layer. The metal layer is a welded corrugated copper sheath, and the thermal insulation layer is an aerogel composite tape.

2. The single crystal copper conductor fire-resistant and rodent-proof cable according to claim 1, characterized in that: The structure of the wire core from inside to outside is conductor, first shielding layer, insulating layer, insulating shielding layer and second shielding layer.

3. The single crystal copper conductor fire-resistant and rodent-proof cable according to claim 2, characterized in that: The number of the wire cores is 3, and the 3 wire cores are symmetrically arranged.

4. A single crystal copper conductor fire-resistant and rodent-proof cable according to any one of claims 1 to 3, characterized in that: The cable core further comprises a wrapping layer, which is arranged outside the core and wraps and fixes the positions of several cores; the wrapping layer is a low-smoke, halogen-free and highly flame-retardant tape.

5. The single crystal copper conductor fire-resistant and rodent-proof cable according to claim 4, characterized in that: The conductor is a special-shaped single-crystal copper conductor, which is formed by twisting and pressing multiple special-shaped single-crystal copper wires; the first shielding layer is a semi-conductive shielding layer for cross-linked conductors, with a thickness of 0.7mm±0.1mm; the insulating layer is a polypropylene insulation layer of 35kV and below, with a thickness of 10.5mm±0.5mm; the insulating shielding layer is an ultra-smooth semi-conductive shielding layer for cross-linked cables, with a thickness of 0.8mm±0.1mm; the first shielding layer, insulating layer, and insulating shielding layer are a three-layer co-extrusion structure; the second shielding layer is a copper tape shielding layer.

6. A single crystal copper conductor fire-resistant and rodent-proof cable according to claim 1 or 5, characterized in that: The filler is a heat-resistant glass fiber filler.

7. The single crystal copper conductor fire-resistant and rodent-proof cable according to claim 6, characterized in that: The isolation layer is a halogen-free low-smoke polyolefin layer.

8. The single crystal copper conductor fire-resistant and rodent-proof cable according to claim 1, characterized in that: The oxygen barrier layer is a ceramic polyolefin oxygen barrier layer.

9. The single crystal copper conductor fire-resistant and rodent-proof cable according to claim 1, characterized in that: The fire-insulating layer is a low-smoke, halogen-free, highly flame-retardant tape; and the outer protective layer is a halogen-free, low-smoke polyolefin layer.

10. The single crystal copper conductor fire-resistant and rodent-proof cable according to claim 1, characterized in that: The cross-section of the wire core and the cable core is circular.

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