Halogen-free low-smoke flame-retardant aluminum alloy conductor power cable

Abstract

The utility model discloses a halogen-free low-smoke flame-retardant aluminum alloy conductor power cable, which relates to the field of cables and comprises a conductor, a conductor shielding layer fixedly mounted on the conductor, an insulating layer fixedly mounted on the conductor shielding layer, an insulating shielding layer fixedly mounted on the insulating layer and a metal shielding layer fixedly mounted on the insulating shielding layer. The conductors, the conductor shielding layers, the insulating layers, the insulating shielding layers and the metal shielding layers are combined into cable cores, a belting cushion layer is fixedly arranged on the three cable cores, and a filling layer is arranged between the cable cores and the belting cushion layer. According to the utility model, through cable material research and cable structure design, the cable has excellent combustion characteristics of low release, low smoke production, no combustion drippings and the like, and the use safety of densely populated high-risk places such as subways, airports, high-rise buildings and the like is improved. The product adopts an aluminum alloy conductor and a shielding structure, so that the material is optimized, the production cost is reduced, and the energy-saving and environment-friendly requirements are further met.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a halogen-free, low-smoke, flame-retardant aluminum alloy conductor power cable. Background Art

[0002] Aluminum alloy cables have achieved great development and wide application in China, especially in photovoltaic power generation and wind power plants. Due to their excellent durability and stability, excellent corrosion resistance, creep resistance, conductivity, cost-effectiveness and light weight, they have been more prominently used in engineering projects in recent years.

[0003] In the prior art, more than 60% of all kinds of electrical fires in my country are caused by electrical lines (wires and cables), which have caused immeasurable losses to personal safety and property; it can be seen that safety fire cables have become the top priority in safety firefighting. At present, the cables commonly used in domestic firefighting sites are mostly halogen-free, low-smoke, flame-retardant cables. This type of cable has a certain ability to prevent the spread of flames in a fire, and the smoke release during its combustion process meets the requirement of 60% transmittance, but this type of cable also has shortcomings, and does not fully consider the impact of the cable on the surrounding combustibles in a fire, such as heat release, burning drips, etc. In addition, most of them use copper core cables, which are relatively expensive; especially the cables used in photovoltaic or wind farms do not fully consider the halogen-free, low-smoke, and flame-retardant functions. It is necessary to consider both flame retardant properties and control cable costs, so a halogen-free, low-smoke, flame-retardant aluminum alloy conductor power cable is needed to meet people's needs. Utility Model Content

[0004] The utility model aims to provide a halogen-free, low-smoke, flame-retardant aluminum alloy conductor power cable to solve the problem that the cable proposed in the above background technology cannot meet the existing use requirements.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A halogen-free, low-smoke, flame-retardant aluminum alloy conductor power cable comprises a conductor, wherein the conductor is an aluminum alloy, a conductor shielding layer is fixedly mounted on the conductor shielding layer, an insulating layer is fixedly mounted on the insulating layer, an insulating shielding layer is fixedly mounted on the insulating layer, a metal shielding layer is fixedly mounted on the insulating shielding layer, the conductor, the conductor shielding layer, the insulating layer, the insulating shielding layer and the metal shielding layer are combined into a cable core, tape cushion layers are fixedly mounted on the three cable cores, a filling layer is arranged between the cable core and the tape cushion layers, an isolation sleeve layer is fixedly mounted on the tape cushion layer, an armor layer is fixedly mounted on the isolation sleeve layer, and an outer sheath layer is fixedly mounted on the armor layer.

[0007] Preferably, the diameter of the conductor monofilament is controlled between 1.38 mm and 3.5 mm, the conductor shielding layer is made of copper foil, and the thickness of the conductor shielding layer is between 0.06 mm and 0.09 mm.

[0008] Preferably, the insulating layer is made of polyethylene, and the thickness of the insulating layer is between 0.2 mm and 0.4 mm; the insulating shielding layer is made of cross-linked polyethylene, and the thickness of the insulating shielding layer is between 0.1 mm and 0.2 mm.

[0009] Preferably, the metal shielding layer is made of 0.15mm thick aluminum alloy tape by overlapping and wrapping, and the tape cushion layer has a thickness of 0.2mm to 0.3mm.

[0010] Preferably, the filling layer is made of butyl rubber, the isolation jacket is made of low-smoke halogen-free flame-retardant polyolefin material for low heat release cables, and the thickness of the isolation jacket is between 0.1 mm and 0.2 mm.

[0011] Preferably, the armor layer is tinned copper tape armor, and the thickness of the armor layer is 0.3 mm.

[0012] Preferably, the outer sheath layer is made of low-smoke, halogen-free, flame-retardant polyolefin material for low heat release cables, and the thickness of the outer sheath layer is 0.2 mm to 0.4 mm.

[0013] The beneficial effects of the utility model are:

[0014] In the utility model, through the research of cable materials and the design of cable structure, the cable has excellent combustion characteristics such as low release, low smoke production, and no burning dripping, which increases the safety of use in densely populated and high-risk places such as subways, airports, and high-rise buildings. The product adopts aluminum alloy conductors and shielding structures, optimizes materials, reduces production costs, and thus meets energy-saving and environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model provides a structural schematic diagram of a halogen-free, low-smoke, flame-retardant aluminum alloy conductor power cable.

[0016] In the figure: 100, conductor; 101, cable core; 200, conductor shielding layer; 300, insulation layer; 400, insulation shielding layer; 500, metal shielding layer; 600, tape cushion layer; 700, filling layer; 800, isolation sleeve layer; 900, armor layer; 110, outer sheath layer. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0018] Reference Figure 1A halogen-free, low-smoke, flame-retardant aluminum alloy conductor power cable comprises a conductor 100, the conductor 100 is an aluminum alloy, a conductor shielding layer 200 is fixedly installed on the conductor 100, an insulating layer 300 is fixedly installed on the conductor shielding layer 200, an insulating shielding layer 400 is fixedly installed on the insulating layer 300, a metal shielding layer 500 is fixedly installed on the insulating shielding layer 400, the conductor 100, the conductor shielding layer 200, the insulating layer 300, the insulating shielding layer 400, and the metal shielding layer 500 are combined into a cable core 101, three cable cores 101 are fixedly installed with tape cushion layers 600, a filling layer 700 is arranged between the cable core 101 and the tape cushion layers 600, an isolation sleeve layer 800 is fixedly installed on the tape cushion layer 600, an armor layer 900 is fixedly installed on the isolation sleeve layer 800, and an outer sheath layer 110 is fixedly installed on the armor layer 900.

[0019] Specifically, the conductor 100 is made of a material conforming to GB / T 3954 "Electrical Round Aluminum Rod" specifies 8030 series aluminum alloy material. The aluminum alloy rod is drawn to obtain aluminum alloy monofilaments with a monofilament diameter controlled at 2.87±0.02mm. The monofilaments are arranged in a 1+6+12 regular structure and twisted by a frame twisting device. The twisting direction of the outermost layer is left-handed, and the twisting directions of adjacent layers are opposite. The pitch of the outermost layer is not more than 14 times the outer diameter of the conductor, and the pitch of the inner layer is not more than 26 times. After twisting, the conductor needs to be annealed to improve the conductivity and flexibility. The annealing temperature is 300℃, and the annealing furnace is heated for 3 hours and kept warm for 6 hours. The strength of the aluminum alloy monofilament after annealing is between 115MPa, the elongation is 15%, and the resistivity is 27.85nΩ.m at 20℃. The outer diameter of the conductor is 12.9mm, and the metal shielding layer is made of overlapping aluminum alloy strips with a thickness of 0.15mm and a width of 40mm. The resistivity of the aluminum alloy strip is ≥57.5%IACS at 20℃.

[0020] In an optional embodiment: the conductor 100 has a single wire diameter controlled between 1.38 mm and 3.5 mm, the conductor shielding layer 200 is made of copper foil, and the thickness of the conductor shielding layer 200 is between 0.06 mm and 0.09 mm. Copper foil has a good shielding effect.

[0021] In an optional embodiment: the insulating layer 300 is made of polyethylene, and the thickness of the insulating layer 300 is 0.2mm to 0.4mm. The insulating shielding layer 400 is made of cross-linked polyethylene, and the thickness of the insulating shielding layer 400 is 0.1mm to 0.2mm. Cross-linked polyethylene is an insulating material formed by cross-linking polyethylene molecules by chemical or physical methods. It has excellent electrical properties, high temperature stability and heat resistance, and can withstand high voltage and current loads. Polyethylene is a common insulating material with good electrical and physical properties. It has high thermal stability and chemical corrosion resistance and can be used in a wide temperature range.

[0022] In an optional embodiment: the metal shielding layer 500 is made of 0.15mm thick aluminum alloy tape by overlapping wrapping, the tape cushion layer 600 has a thickness of 0.2mm to 0.3mm, and the metal shielding layer is made of 0.15mm thick, 40mm wide aluminum alloy tape by overlapping wrapping. The aluminum alloy tape has a resistivity of ≥57.5% IACS at 20°C, a smooth surface, and strong corrosion resistance. It is produced with low-smoke halogen-free flame-retardant tape, contains flame retardants, and will decompose water vapor at high temperatures to achieve cooling and fire isolation effects, and the number of tape wrapping layers is simplified to reduce the outer diameter of the product.

[0023] In an optional embodiment: the filling layer 700 is made of butyl rubber, the isolation jacket layer 800 is made of low-smoke halogen-free flame-retardant polyolefin material for low-heat release cables, the thickness of the isolation jacket layer 800 is 0.1mm to 0.2mm, the outer jacket layer 110 is made of low-smoke halogen-free flame-retardant polyolefin material for low-heat release cables, the thickness of the outer jacket layer 110 is 0.2mm to 0.4mm, the isolation jacket layer and the outer jacket layer are made of low-smoke halogen-free flame-retardant polyolefin material for low-heat release cables, the material has excellent low smoke and halogen-free performance, and is fire-resistant. In the event of a disaster, less smoke is generated during combustion, and the smoke does not contain halogen and is non-toxic, avoiding "secondary damage"; the material generates smoke at a slow rate during combustion and has low heat release, reducing the risk of rapid spread of fire due to increased temperature; and the material will not fall, preventing the material with flames from falling around and causing new fire sources. The isolation sleeve and outer sheath layer are produced using a φ150 plastic extruder and a double-threaded screw with a compression ratio of 2.0. The extrusion temperature is controlled between 110°C and 175°C. The surface of the extruded protective layer is smooth, free of pores and charred material, and has a uniform thickness.

[0024] In an optional embodiment: the armor layer 900 is a tinned copper tape armor, and the thickness of the armor layer 900 is 0.3 mm. The tinned layer improves the corrosion resistance of the copper tape and is suitable for humid or corrosive environments.

[0025] Working principle of this utility model:

[0026] The conductor is in accordance with GB / T 3954 "Electrical Round Aluminum Rod" stipulates that the 8030 series aluminum alloy material is used. The aluminum alloy rod is drawn to obtain aluminum alloy monofilaments with a monofilament diameter controlled at 2.87±0.02mm. The monofilaments are arranged in a 1+6+12 regular structure and twisted using a frame twisting device. The twisting direction of the outermost layer is left-handed, and the twisting directions of adjacent layers are opposite. The pitch of the outermost layer is not more than 14 times the outer diameter of the conductor, and the pitch of the inner layer is not more than 26 times. After twisting, the conductor needs to be annealed to improve the conductivity and flexibility. The annealing temperature is 300℃, and the annealing furnace is heated for 3 hours and kept warm for 6 hours. The strength of the aluminum alloy monofilament after annealing is between 115MPa, the elongation is 15%, and the resistivity is 27.85nΩ.m at 20℃. The outer diameter of the conductor is 12.9mm, and the metal shielding layer is made of overlapping aluminum alloy strips with a thickness of 0.15mm and a width of 40mm. The resistivity of the aluminum alloy strip at 20℃ is ≥57. 5% IACS, smooth surface, strong corrosion resistance, produced by low-smoke halogen-free flame-retardant tape, containing flame retardant, which will decompose water vapor at high temperature to achieve cooling and fire isolation, and simplify the number of tape wrapping layers, reduce the outer diameter of the product, isolation sleeve layer and outer sheath layer, use low-smoke halogen-free flame-retardant polyolefin material for low heat release cable, the material has excellent low smoke and halogen-free performance, in the case of fire, less smoke when burning, no halogen in the smoke, non-toxic, avoid "secondary damage"; the material has a slow smoke rate and low heat release during combustion, reducing the risk of rapid spread of fire due to temperature increase; and the material will not fall, avoiding the falling of materials with flames and causing new fire sources. The isolation sleeve and outer sheath are produced by a φ150 plastic extruder and a double-threaded screw with a compression ratio of 2.0. The extrusion temperature is controlled between 110℃ and 175℃. The surface of the extruded sheath is smooth, free of pores and char, and the thickness is uniform.

[0027] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A halogen-free, low-smoke, flame-retardant aluminum alloy conductor power cable, comprising a conductor (100), characterized in that: The conductor (100) is made of aluminum alloy, a conductor shielding layer (200) is fixedly mounted on the conductor (100), an insulating layer (300) is fixedly mounted on the conductor shielding layer (200), an insulating shielding layer (400) is fixedly mounted on the insulating layer (300), a metal shielding layer (500) is fixedly mounted on the insulating shielding layer (400), and the conductor (100), the conductor shielding layer (200), the insulating layer (300), the insulating shielding layer (400) are fixedly mounted. 0), a metal shielding layer (500) is combined into a cable core (101), a tape cushion layer (600) is fixedly installed on the three cable cores (101), a filling layer (700) is arranged between the cable core (101) and the tape cushion layer (600), an isolation sleeve layer (800) is fixedly installed on the tape cushion layer (600), an armor layer (900) is fixedly installed on the isolation sleeve layer (800), and an outer sheath layer (110) is fixedly installed on the armor layer (900).

2. The halogen-free, low-smoke, flame-retardant aluminum alloy conductor power cable according to claim 1, characterized in that: The diameter of a single wire of the conductor (100) is controlled to be between 1.38 mm and 3.5 mm, the conductor shielding layer (200) is made of copper foil, and the thickness of the conductor shielding layer (200) is between 0.06 mm and 0.09 mm.

3. The halogen-free, low-smoke, flame-retardant aluminum alloy conductor power cable according to claim 1, characterized in that: The insulating layer (300) is made of polyethylene, and the thickness of the insulating layer (300) is between 0.2 mm and 0.4 mm; the insulating shielding layer (400) is made of cross-linked polyethylene, and the thickness of the insulating shielding layer (400) is between 0.1 mm and 0.2 mm.

4. The halogen-free, low-smoke, flame-retardant aluminum alloy conductor power cable according to claim 1, characterized in that: The metal shielding layer (500) is made of 0.15 mm thick aluminum alloy tapes through overlapping wrapping, and the tape wrapping cushion layer (600) has a thickness of 0.2 mm to 0.3 mm.

5. The halogen-free, low-smoke, flame-retardant aluminum alloy conductor power cable according to claim 1, characterized in that: The filling layer (700) is made of butyl rubber, the isolation sleeve layer (800) is made of low-smoke, halogen-free, flame-retardant polyolefin material for low-heat release cables, and the thickness of the isolation sleeve layer (800) is between 0.1 mm and 0.2 mm.

6. The halogen-free, low-smoke, flame-retardant aluminum alloy conductor power cable according to claim 1, characterized in that: The armor layer (900) is tinned copper tape armor, and the thickness of the armor layer (900) is 0.3 mm.

7. The halogen-free, low-smoke, flame-retardant aluminum alloy conductor power cable according to claim 1, characterized in that: The outer sheath layer (110) is made of low-smoke, halogen-free, flame-retardant polyolefin material for low-heat release cables, and the thickness of the outer sheath layer (110) is between 0.2 mm and 0.4 mm.

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