CN203338803U - Low Smoke Halogen Free Flame Retardant Photovoltaic Cable - Google Patents

Abstract

The utility model provides a low smoke halogen-free flame-retardant photovoltaic cable, which comprises conductive wire cores, an isolating layer, an insulating layer and a sheath layer, wherein the isolating layer composed of a low smoke halogen-free flame-retardant glass cloth belt is overlapped and wrapped outside the conductive wire cores, the insulating layer is extruded outside the isolating layer, the sheath layer is extruded outside the insulating layer, and the conductive wire cores are stranded according to a law that a lay ratio of each layer of the conductive wire cores is increased by 2 from outside to inside. The low smoke halogen-free flame-retardant photovoltaic cable has the advantages of scientific design, better weather proof performance, better UV resistance and better ozone corrosion resistance, is environment-friendly and pollution-free, and can withstand temperature variations in a wider range.

Description

Low Smoke Halogen Free Flame Retardant Photovoltaic Cable

technical field

The utility model relates to the technical field of photovoltaic cables, in particular to a low-smoke, halogen-free, flame-retardant photovoltaic cable.

Background technique

Under the influence of the financial crisis, the Chinese government regards the development of new energy as an important means of revitalizing the economy. There is no doubt that solar technology will become one of the green energy technologies in the future. Solar energy or photovoltaic (PV) is widely used in China, and building cost-effective and profitable photovoltaic power plants represents the most important goal and core competitiveness of all solar manufacturers. , and its profitability not only depends on the efficiency or high performance of solar modules, but also depends on its important power transmission tool - photovoltaic cables. However, most photovoltaic power plants are built in desert areas with extremely harsh environments, and existing In this environment, the photovoltaic cables are not satisfactory in terms of weather resistance, ultraviolet resistance, ozone corrosion resistance and resistance to large temperature changes. Photovoltaic power plants need to replace cables frequently to ensure their own efficiency and stability. Greatly increased production costs, but also caused greater environmental pollution.

In order to solve the above existing problems, people have been seeking an ideal technical solution.

Utility model content

The purpose of the utility model is a low-smoke halogen-free flame-retardant photovoltaic cable to solve the problem of low tolerance to ultraviolet rays, ozone corrosion and large temperature changes existing in existing photovoltaic cables.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a low-smoke halogen-free flame-retardant photovoltaic cable, including a conductive wire core composed of multiple tinned copper monofilaments twisted, overlapping and wrapping around the conductive core. An isolation layer made of low-smoke halogen-free flame-retardant glass cloth tape outside the wire core, an insulating layer extruded outside the isolation layer, and a sheath layer extruded outside the insulating layer.

Basically, the pitch ratio of the outermost layer of the conductive core is 9, and the pitch ratio of each layer of the conductive core increases by 2 sequentially from the outside to the inside.

Based on the above, the insulating layer is made of 150°C radiation cross-linked low-smoke halogen-free flame-retardant polyolefin material.

Based on the above, the sheath layer is made of 150°C radiation cross-linked low-smoke halogen-free flame-retardant polyolefin material.

Basically, the overlapping width of the low-smoke, halogen-free and flame-retardant glass cloth tapes overlapping and wrapping around the conductive wire core is 15% to 25% of its bandwidth.

Compared with the prior art, the utility model has substantive characteristics and progress. Specifically, ① the conductive core of the low-smoke halogen-free flame-retardant photovoltaic cable in the utility model is composed of multiple tinned copper monofilaments twisted, which is more common than the usual The structure of multiple twisted strands is more suitable for harsh weather factors and has a longer service life; ② According to the rule of adding 2 to the pitch diameter ratio from outside to inside, the conductive core is bundled and stranded. This structure is stable and elastic, and the appearance is smoother ;③ Solar energy systems are often used in harsh environmental conditions, and the materials used outdoors should be determined according to ultraviolet rays, ozone, severe temperature changes and chemical erosion. Using low-grade materials under such environmental stress will cause the cable sheath to be fragile , and even decompose the cable insulation layer, all of these situations will directly increase the loss of the cable system, and at the same time, the risk of cable short circuit will also increase. Flame-retardant polyolefin used as insulating layer and sheath layer obviously cannot meet the technical requirements of photovoltaic cables. In order to enhance the product’s environmental resistance and long service life, it must be cross-linked to convert thermoplastic polyolefin materials into thermosetting polyolefin materials. , and the general cross-linking method is difficult to make the material meet the required technical indicators. Only the electron irradiation cross-linking method is selected. After electron irradiation, the chemical structure of the polymer is changed, and the fusible thermoplastic material is converted into a non-fusible The cross-link radiation significantly improves the thermal, mechanical and chemical properties of the cable insulation material, making it resistant to ultraviolet rays, ozone corrosion and large temperature differences; ④The isolation layer adopts low-smoke Halogen flame-retardant glass cloth tapes are overlapped and wrapped, and the overlapping width is 15% to 25% of its bandwidth. This material has high flame-retardant characteristics, high strength, and less smoke when passively burned, so that the wrapping can make its effect Larger and longer service life, it has the advantages of scientific design, environmental protection and pollution-free, more weather-resistant, more resistant to ultraviolet rays, more resistant to ozone corrosion, and able to withstand a wider range of temperature changes.

Description of drawings

Figure 1 is a schematic structural view of the low-smoke halogen-free flame-retardant photovoltaic cable of the present invention.

In the figure: 1. Conductor; 2. Conductor isolation layer; 3. Insulation layer; 4. Sheath layer.

Detailed ways

The technical solutions of the present invention will be further described in detail through specific implementation methods below.

As shown in Figure 1, a low-smoke, halogen-free, flame-retardant photovoltaic cable includes a conductive core 1 composed of multiple tinned copper monofilaments stranded, and a low-smoke, halogen-free cable wrapped around the conductive core 1. The insulating layer 2 composed of flame-retardant glass cloth tape, the insulating layer 3 extruded outside the insulating layer 2 and the sheath layer 4 extruded outside the insulating layer 3, the pitch diameter ratio of the outermost layer of the conductive core 1 is 9, The pitch diameter ratio of each layer of the conductive core 1 is sequentially increased by 2 from the outside to the inside. The insulating layer 3 is made of 150°C radiation cross-linked low-smoke halogen-free flame-retardant polyolefin material, and the sheath layer 4 is made of 150°C radiation. Composed of cross-linked low-smoke, halogen-free, and flame-retardant polyolefin materials, the overlapping width of the low-smoke, halogen-free, and flame-retardant glass cloth tapes wrapped around the conductive wire core 1 is 15% to 25% of its bandwidth.

Conductive core 1 is composed of multiple tinned copper monofilament strands, which is more adaptable to harsh weather conditions and has a longer service life than the usual multi-twisted structure of strands; the pitch diameter ratio of the outermost layer of conductive core 1 is 9. The pitch diameter ratio of each layer of conductive core 1 is increased by 2 in order from outside to inside. Conductive core 1 is based on one tinned copper monofilament in the innermost layer, and 6 tinned copper monofilaments in the second layer. Then add 6 strands to each layer outwards for bundle twisting. This structure is stable, elastic, and has a smoother appearance; solar energy systems are often used in harsh environmental conditions, and materials used outdoors should be based on ultraviolet light, ozone, severe temperature changes and Depending on the chemical corrosion situation, the low-smoke, halogen-free and flame-retardant polyolefin used as the insulating layer and the sheath layer obviously cannot meet the technical requirements of photovoltaic cables. To enhance the product’s environmental resistance and long service life, it must be cross-linked. The thermoplastic polyolefin material is converted into a thermosetting polyolefin material, and the general cross-linking method is difficult to make the material meet the required technical indicators. Only the electron irradiation cross-linking method is selected. After electron irradiation, the chemical structure of the polymer is changed. The conversion of fusible thermoplastic materials to non-fusible elastomeric materials, cross-link radiation significantly improves the thermal, mechanical and chemical properties of the cable insulation, making it resistant to UV rays, ozone corrosion and large temperature differences The isolation layer is wrapped with low-smoke, halogen-free and flame-retardant glass cloth with overlapping width of 15% to 25% of its bandwidth. This material has high flame-retardant characteristics, high strength, and less smoke when passively burned. , so that the wrapping can make its effect greater and the service life longer.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model and not limit it; although the utility model has been described in detail with reference to the preferred embodiment, those of ordinary skill in the art should understand that: still The specific implementation of the utility model can be modified or some technical features can be equivalently replaced; without departing from the spirit of the technical solution of the utility model, all of them should be included in the scope of the technical solution claimed by the utility model.

Claims (5)

1. A low-smoke, halogen-free, flame-retardant photovoltaic cable, characterized in that: it includes a conductive wire core formed by twisting a plurality of tinned copper monofilaments, and a low-smoke, non-halogen An isolation layer made of halogen flame-retardant glass cloth tape, an insulating layer extruded outside the isolation layer, and a sheath layer extruded outside the insulating layer. 2. The low-smoke, halogen-free, flame-retardant photovoltaic cable according to claim 1, characterized in that: the pitch ratio of the outermost layer of the conductive core is 9, and the pitch ratio of each layer of the conductive core is in accordance with Add 2 in order from outside to inside. 3. The low-smoke, halogen-free, flame-retardant photovoltaic cable according to claim 1 or 2, wherein the insulating layer is made of low-smoke, halogen-free, and flame-retardant polyolefin material irradiated at 150°C. 4. The low-smoke, halogen-free, flame-retardant photovoltaic cable according to claim 1 or 2, wherein the sheath layer is made of low-smoke, halogen-free, and flame-retardant polyolefin material irradiated at 150°C. 5. The low-smoke, halogen-free, flame-retardant photovoltaic cable according to claim 1 or 2, characterized in that: the overlapping width of the low-smoke, halogen-free, flame-retardant glass cloth tape wrapped around the conductive core is its width 15% to 25% of that.