Fireproof flame-retardant aluminum alloy photovoltaic cable

Abstract

The utility model discloses a fireproof flame-retardant aluminum alloy photovoltaic cable, and relates to the field of photovoltaic wires and cables, the fireproof flame-retardant aluminum alloy photovoltaic cable comprises a conductor, the outer surface of the conductor is wrapped with a fireproof layer, an insulating layer is extruded outside the fireproof layer, a flame-retardant fireproof layer is coated outside the insulating layer, and an outer sheath layer is extruded outside the flame-retardant fireproof layer. According to the invention, the fireproof layer and the flame-retardant fireproof layer are utilized, so that the fireproof, flame-retardant and high-temperature-resistant performances of the photovoltaic cable are effectively improved. Meanwhile, the fireproof layer can effectively prevent combustion and prevent flame from directly burning the conductor. The flame-retardant fireproof layer can effectively improve the fire spreading prevention performance of the cable, and the cable is novel in structure and convenient to operate.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic wires and cables, and in particular to a fire-resistant and flame-retardant aluminum alloy photovoltaic cable. Background Art

[0002] Photovoltaic cable is a cable that connects solar panels to the power system. Its main function is to transmit the electrical energy generated by solar panels to the power system.

[0003] However, since most photovoltaic cables are used in outdoor environments, they will be affected by high temperatures or unknown environments for a long time. In addition, in solar power generation systems, the performance of photovoltaic cables will directly affect the efficiency and stability of the entire system.

[0004] Therefore, it is necessary to further improve the flame retardancy, fire resistance and high temperature resistance of photovoltaic cables. Utility Model Content

[0005] In order to further improve the fire resistance, flame retardancy and high temperature resistance of photovoltaic cables, the present application provides a fire-resistant and flame-retardant aluminum alloy photovoltaic cable.

[0006] The present application provides a fire-resistant and flame-retardant aluminum alloy photovoltaic cable, which adopts the following technical solution:

[0007] A fire-resistant and flame-retardant aluminum alloy photovoltaic cable comprises a conductor, wherein the outer surface of the conductor is wrapped with a fire-resistant layer, an insulating layer is extruded outside the fire-resistant layer, a flame-retardant and fireproof layer is coated outside the insulating layer, and an outer sheath layer is extruded outside the flame-retardant and fireproof layer.

[0008] By adopting the above technical solution, the fire-resistant layer and the flame-retardant and fire-proof layer are used to effectively improve the fire resistance, flame retardancy and high temperature resistance of the photovoltaic cable. At the same time, the fire-resistant layer can effectively prevent combustion and prevent the flame from directly burning the conductor. The flame-retardant and fire-proof layer can effectively improve the performance of the cable in preventing the spread of fire.

[0009] Preferably, the conductor is a single solid aluminum alloy conductor.

[0010] By adopting the above technical solution, the single solid aluminum alloy conductor simplifies the cable structure. Since a single conductor is used, there is no need to worry about the arrangement, connection and possible poor contact between multiple conductors. This greatly reduces the complexity and difficulty of the production process and improves production efficiency.

[0011] Preferably, the conductor is an aluminum alloy non-compact stranded circular conductor.

[0012] By adopting the above technical solution, the twisted round conductor makes the conductor more flexible when bending, thereby improving the bending capacity of the conductor.

[0013] Preferably, the fire-resistant layer is made of high-temperature resistant ceramic silicone rubber belt.

[0014] By adopting the above technical scheme, the high temperature resistant ceramic silicone rubber belt has excellent fireproof, flame retardant, low smoke, non-toxic and other characteristics. The residue on its surface after burning is a layer of hard ceramic shell, and this hard ceramic shell can not melt or drip in the event of a fire, and plays a very good flame retardant, fire-resistant, fireproof and fire-isolating role.

[0015] Preferably, the fire-resistant layer is wrapped in a single layer overlapping left-handed manner.

[0016] By adopting the above technical solution, it is possible to ensure that the wrapping material is closely attached to the cable, reduce the gap between the materials, and thus enhance the stability of the cable structure. This close fit helps prevent the cable from loosening or falling off during use, and improves the overall durability and reliability of the cable.

[0017] Preferably, the insulating layer is made of 125°C radiation cross-linked halogen-free flame retardant insulating material.

[0018] By adopting the above technical solution, the halogen-free flame-retardant insulation material releases no halogen when burning, has low smoke emission, low toxicity, and good flame retardant performance. At the same time, the cable made of halogen-free flame-retardant insulation material has excellent heat resistance after irradiation, which can meet the use requirements of the long-term working temperature of the core of 125 °C.

[0019] Preferably, the flame retardant fireproof layer adopts water-based cable fire retardant coating.

[0020] By adopting the above technical solution, a uniform and dense sponge-like foam insulation layer can be generated when the cable is exposed to fire, which can effectively suppress and block the propagation and spread of flames and protect the cable.

[0021] Preferably, the flame retardant and fireproof layer needs to be applied at least 5 times during spraying, and the thickness of the coating is 0.5-1 mm.

[0022] By adopting the above technical solution, the fireproof performance of the flame retardant fireproof layer is further improved.

[0023] Preferably, the outer sheath layer is made of TPE sheath material.

[0024] By adopting the above technical solution, the cable has excellent properties of good high elasticity, aging resistance and oil resistance, and is easy to process, and can be processed by injection molding and other methods.

[0025] Preferably, the outer sheath layer is made of SEBS sheath material.

[0026] By adopting the above technical solutions, the SEBS sheath material has excellent weather resistance and aging resistance. Even in harsh external environments, it can maintain its stable performance and extend the service life of the cable.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. The fire-resistant layer and the flame-retardant and fire-proof layer effectively improve the fire-resistant, flame-retardant and high-temperature resistance of the photovoltaic cable. At the same time, the fire-resistant layer can effectively prevent combustion and prevent the flame from directly burning the conductor. The flame-retardant and fire-proof layer can effectively improve the performance of the cable to prevent the spread of fire, and the application has a novel structure and is easy to operate;

[0029] 2. By wrapping ceramic silicone rubber tape on the conductor surface and spraying cable-specific flame retardant and fireproof coating after insulation, when a fire occurs, the flame retardant and fireproof agent can generate a uniform and dense sponge-like foam insulation layer when exposed to fire, which can effectively inhibit and block the spread and spread of flames. At the same time, it begins to harden into a ceramic shell at a temperature above 350°C. In the event of a fire, the "ceramic" hard shell can play a good role in flame retardancy, fire resistance, fire prevention and fire isolation, and protect the aluminum alloy photovoltaic line with good fire resistance, so that the cable can ensure the normal operation and stability of the solar power generation system in a complex natural environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram mainly showing the overall structure of the photovoltaic cable in this embodiment 1;

[0031] Figure 2 This is a schematic diagram of the overall structure of the photovoltaic cable in this embodiment 2.

[0032] Figure numerals: 1. conductor; 2. fire-resistant layer; 3. insulation layer; 4. flame retardant and fireproof layer; 5. outer sheath layer. DETAILED DESCRIPTION

[0033] The present application is further described in detail below in conjunction with the accompanying drawings.

[0034] The embodiment of the present application discloses a fire-resistant and flame-retardant aluminum alloy photovoltaic cable.

[0035] Embodiment 1:

[0036] Reference Figure 1 The fire-resistant and flame-retardant aluminum alloy photovoltaic cable comprises a conductor 1, a fire-resistant layer 2, an insulating layer 3, a flame-retardant and fireproof layer 4 and an outer sheath layer 5 arranged in sequence from the inside to the outside. To further illustrate, a fire-resistant layer 2 is wrapped around the conductor 1, an insulating layer 3 is extruded around the outer periphery of the fire-resistant layer 2, a flame-retardant and fireproof layer 4 is sprayed around the outer periphery of the insulating layer 3, and an outer sheath layer 5 is extruded outside the flame-retardant and fireproof layer 4.

[0037] Specifically, in the present embodiment, the conductor 1 is a single solid aluminum alloy conductor 1, and the surface of the conductor 1 is required to be round, smooth and burr-free. The single solid aluminum alloy conductor 1 simplifies the cable structure. Since a single conductor 1 is used, there is no need to worry about the arrangement, connection and possible poor contact between multiple conductors 1. This greatly reduces the complexity and difficulty of the production process and improves production efficiency. At the same time, since the conductor 1 is a solid structure, it can effectively enhance the mechanical strength of the cable, and has higher tensile strength and bending resistance. And it also helps to reduce the production cost of the cable. The cost of aluminum alloy materials is relatively low, and the processing technology is relatively simple, which helps to reduce the overall manufacturing cost of the cable and improve market competitiveness.

[0038] Furthermore, in this embodiment, the fire-resistant layer 2 is made of high-temperature ceramic silicone rubber tape, and the high-temperature ceramic silicone rubber tape is wrapped around the conductor 1 by a single-layer left-overlapping wrapping method. The high-temperature ceramic silicone rubber tape has excellent fire-proof, flame-retardant, low-smoke, non-toxic and other characteristics. The residue on its surface after burning is a layer of hard ceramic shell, and this hard ceramic shell can not melt or drip in the case of fire, and can pass the line integrity test specified in GB / T19216.21-2003 at 950℃-1000℃ for 90min and cooling for 15min, so it has excellent fire-proof, flame-retardant, low-smoke, non-toxic and other characteristics. It can provide excellent fire resistance to the cable.

[0039] Furthermore, in this embodiment, the insulating layer 3 uses 125°C irradiation cross-linked halogen-free flame-retardant polyolefin insulation material, and the halogen-free flame-retardant insulation material is extruded around the high-temperature ceramic silicone rubber belt. It should be noted that irradiation cross-linking is required after extrusion. It should also be noted that the nominal thickness of the insulating layer 3 is the process requirement value, the thinnest point of the insulating layer 3 is not less than the nominal value × 90%-0.1mm, and the surface is required to be smooth, free of old glue, scratches and other defects. In this embodiment, the 125°C irradiation cross-linked halogen-free flame-retardant insulation material uses a halogen-free base material and a compounding agent, which releases no halogen when burned, has low smoke emission, low toxicity, and good flame retardant properties. After irradiation, the cable made of this product has excellent heat resistance and can meet the use requirements of the long-term working temperature of the core at 125 ゜C, and thus this product has excellent low-smoke halogen-free flame retardant properties.

[0040] Furthermore, the flame retardant fireproof layer 4 is sprayed with fireproof coating. In this embodiment, the fireproof coating is a kind of water-based fireproof coating for cables composed of tert-acrylic emulsion water-based material with various fire retardants, plasticizers, etc. The coating can generate a uniform and dense sponge-like foam insulation layer when exposed to fire, which can effectively inhibit and block the spread and spread of flames and protect the cable. When spraying the fireproof coating, the fireproof coating should be fully stirred and evenly mixed. When the coating is slightly thick, it can be diluted with an appropriate amount of tap water. When brushing, it needs to be brushed more than 5 times, and the thickness of the coating is 0.5-1mm, and the amount used is about 1.5kg / m.

[0041] Furthermore, in this embodiment, the outer sheath layer 5 adopts TPE sheath material, which has the excellent properties of high elasticity, aging resistance and oil resistance of traditional cross-linked vulcanized rubber, and is easy to process. It can be processed by injection molding and other methods. Not only is the preparation method simple, but the cost is also low. TPE sheath material also has good flame retardant effect, which can effectively improve the safety performance of the cable and reduce the risk of fire. At the same time, it also has high flexibility and abrasion resistance, can provide good flexibility and wear resistance, and ensure the service life of the cable in complex environments.

[0042] It should be noted that, in some other embodiments, the outer sheath layer 5 can also use SEBS (hydrogenated styrene-butadiene-styrene block copolymer) sheath material. The SEBS sheath material is a new type of modified elastomer made by selectively hydrogenating the unsaturated double bonds of the butadiene segment in the thermoplastic block copolymer SBS (styrene-butadiene-styrene) molecule. It can melt and flow at high temperature and can be directly processed and formed. The polystyrene hard segment (s segment) in the SEBS molecular chain contains a benzene ring, has greater rigidity and poor mobility; the ethylene-butylene soft segment (eb segment) molecular chain is a carbon straight chain with a side chain and has higher flexibility; due to the difference in flexibility, the two blocks form a physical cross-linked network in which the polystyrene hard segment dispersed phase is distributed in the ethylene-butylene soft segment continuous phase, which hinders the free movement of the soft segment and makes SEBS show good elasticity; in addition, the unsaturated double bonds of the butadiene segment in the SEBS molecular structure are hydrogenated and saturated, so that it has excellent properties such as heat resistance, oxidation resistance, and UV resistance. At the same time, due to its excellent electrical insulation, SEBS The inherent resistance is 104-106ω·cm, and the withstand voltage is 10-40v / μm. Therefore, SEBS has excellent physical properties. It has good elasticity and strength, and can provide effective mechanical protection for the cable to prevent damage to the cable from the external environment. At the same time, SEBS sheath material also exhibits excellent weather resistance and aging resistance. Even in harsh external environments, it can maintain its stable performance and extend the service life of the cable.

[0043] Specifically, during the reprocessing of the outer sheath layer 5 of this embodiment, the average thickness of the sheath should not be less than the nominal value, and the thinnest point should not be less than 85%-0.1mm of the nominal value. The sheath surface should be flat, uniform in color, well plasticized, and free of defects such as scorch, holes, disconnection, and pores. The finished cable is required to be round, and its ovality should not exceed 15%.

[0044] The processing process of a fire-resistant and flame-retardant aluminum alloy photovoltaic cable in the embodiment of the present application is as follows:

[0045] 1. Use a single solid aluminum alloy conductor 1, and use a self-made hot air circulation furnace or aging furnace. The round aluminum alloy wire after annealing has a tensile strength of 98~159N / mm2, an elongation of 15~30%, and a resistivity of no more than 0.028264Ω·mm2 / m. The surface of the round aluminum alloy wire after annealing should be smooth and round, and there should be no collision.

[0046] 2. Wrap a layer of high temperature resistant ceramic silicone rubber tape around the conductor 1, with uniform width and thickness, without defects such as burrs, wrinkles, moisture stains, etc., and use a single layer left-overlapping wrapping method;

[0047] 3. Extrude a layer of 125℃ irradiation cross-linked halogen-free flame-retardant polyolefin insulation material outside the high-temperature resistant ceramic silicone rubber belt. The nominal insulation thickness is the process requirement value. The thinnest point of the insulation layer 3 is not less than the nominal value × 90%-0.1mm. The surface is required to be smooth, without old glue, scratches and other defects;

[0048] 4. Spray a layer of water-based fire retardant coating on the surface of the insulation material. It needs to be applied more than 5 times, and the thickness of the coating is 0.5-1mm, and the approximate amount is 1.5kg / m;

[0049] 5. Extrude an outer sheath layer 5 on the outside of the fire retardant coating. The average thickness of the sheath should not be less than the nominal value, and the thinnest point should not be less than 85%-0.1mm of the nominal value. The sheath surface should be flat, uniform in color, well plasticized, and free of defects such as scorch, holes, disconnection, and pores. The finished cable is required to be round, and its ovality should not exceed 15%.

[0050] Embodiment 2:

[0051] Reference Figure 2The difference between this embodiment and the first embodiment is that the conductor 1 of this embodiment adopts the second type of aluminum alloy non-compacted stranded round conductor 1 required by GB / T 3956-2008. The stranded conductor 1 is not allowed to be welded as a whole core or strand. The single wire in the stranded conductor 1 is allowed to be welded, but in the same layer, the distance between two adjacent joints should be no less than 300mm, and the surface should be smooth and free of burrs. In addition, the stranded conductor 1 adopts a homemade hot air circulation furnace or an aging furnace. The round aluminum alloy wire after annealing has a tensile strength of 98~159N / mm2, an elongation of 15~30%, and a resistivity of no more than 0.028264Ω·mm2 / m. The surface of the round aluminum alloy wire after annealing should be smooth and round, and there should be no collision and other phenomena.

[0052] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A fire-resistant and flame-retardant aluminum alloy photovoltaic cable, comprising a conductor (1), characterized in that: The outer surface of the conductor (1) is wrapped with a fire-resistant layer (2), the fire-resistant layer (2) is extruded with an insulating layer (3), the insulating layer (3) is coated with a flame-retardant and fireproof layer (4), and the flame-retardant and fireproof layer (4) is extruded with an outer sheath layer (5); The conductor (1) is an aluminum alloy non-compacted stranded circular conductor (1); The fire-resistant layer (2) is made of high-temperature resistant ceramic silicone rubber belt; The fire-resistant layer (2) is wrapped in a single-layer left-overlapping manner; The insulating layer (3) is made of 125°C irradiation cross-linked halogen-free flame retardant insulating material; The flame retardant fireproof layer (4) is made of water-based cable fireproof paint; The flame retardant and fireproof layer (4) needs to be applied at least 5 times during spraying, and the thickness of the coating is 0.5-1 mm; The outer sheath layer (5) is made of TPE sheath material.

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