Photovoltaic cable

Abstract

The utility model discloses a photovoltaic cable, which comprises a conductor, an insulating layer and a sheath, the insulating layer comprises an isolating layer, a first anti-aging layer and a first ultraviolet ray absorbing layer, and the isolating layer, the first anti-aging layer and the first ultraviolet ray absorbing layer are sequentially wrapped outside the conductor from inside to outside; the sheath comprises a protective layer, a second anti-aging layer and a second ultraviolet ray absorption layer; and the protective layer, the second anti-aging layer and the second ultraviolet ray absorption layer sequentially wrap the first ultraviolet ray absorption layer from inside to outside. The high-weather-resistance and high-ultraviolet-resistance photovoltaic cable can meet the use requirements of high weather resistance and high ultraviolet resistance, and solves the technical problems of complex structure and high manufacturing difficulty of the high-weather-resistance and high-ultraviolet-resistance photovoltaic cable in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic cables, in particular to a photovoltaic cable. Background Art

[0002] Photovoltaic cables are an indispensable component of solar power generation systems, used to connect solar panels, inverters, power grids and other equipment. When used in outdoor environments for a long time, photovoltaic cables are often affected by multiple factors such as ultraviolet rays, high temperature, humidity and oxidation, which can cause cable performance degradation, accelerated aging, and even cause safety hazards. At present, most of the common photovoltaic cables on the market use ordinary plastic materials as insulation layers and sheaths. Although they have certain insulation properties and weather resistance, they are easily corroded by ultraviolet rays when exposed to sunlight for a long time outdoors, resulting in material aging, discoloration, cracking and other problems. In addition, these cables are relatively poor in heat resistance, cold resistance and chemical corrosion resistance, and cannot meet the use requirements in various complex environments.

[0003] Chinese utility model patent ZL202222215593.6 discloses "a highly weather-resistant and UV-resistant photovoltaic cable". The UV-resistant outer layer can improve the cable's UV resistance, and a circle of ridges can be evenly arranged at equal distances on the outer ring of the steel belt armor layer to improve the cable's weather resistance. However, the cable structure provided by this technology is relatively complex, which increases the difficulty of manufacturing. Therefore, it is necessary to propose a new form of photovoltaic cable with strong weather resistance and UV resistance. Utility Model Content

[0004] The purpose of the utility model is to provide a photovoltaic cable, which can meet the use requirements of high weather resistance and high UV resistance, and at the same time solve the technical problems of complex structure and great manufacturing difficulty of high weather resistance and high UV resistance photovoltaic cables in the prior art.

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

[0006] A photovoltaic cable comprises a conductor, an insulating layer and a sheath, wherein the insulating layer comprises an isolation layer, a first anti-aging layer and a first ultraviolet absorption layer, and the isolation layer, the first anti-aging layer and the first ultraviolet absorption layer are sequentially wrapped around the outside of the conductor from the inside to the outside; the sheath comprises a protective layer, a second anti-aging layer and a second ultraviolet absorption layer, and the protective layer, the second anti-aging layer and the second ultraviolet absorption layer are sequentially wrapped around the outside of the first ultraviolet absorption layer from the inside to the outside.

[0007] In some embodiments, the photovoltaic cable further includes a sheath, wherein the sheath is wrapped around the outside of the second ultraviolet absorbing layer.

[0008] In some embodiments, the outer coating is a polyurethane layer or a nylon layer.

[0009] In some embodiments, the isolation layer is a cross-linked polyethylene layer.

[0010] In some embodiments, the isolation layer is an EPDM rubber layer.

[0011] In some embodiments, the protective layer is a fluororubber layer.

[0012] In some embodiments, the protective layer is a silicone rubber layer.

[0013] In some embodiments, the average thickness of the insulating layer is greater than or equal to 0.7 mm.

[0014] In some embodiments, the thickness of the insulating layer at its thinnest point is greater than or equal to 0.58 mm.

[0015] In some embodiments, the thickness of the sheath at its thinnest point is greater than or equal to 0.63 mm.

[0016] The beneficial effects of the utility model mainly include:

[0017] Compared with the existing highly weather-resistant and highly UV-resistant photovoltaic cables, the photovoltaic cable provided by the utility model only comprises a conductor, an insulating layer and a sheath, has a simple structure, is easy to manufacture, and has a relatively low cost; at the same time, the photovoltaic cable provided by the utility model, whose insulating layer is composed of an isolation layer, a first anti-aging layer and a first UV absorption layer, and whose sheath is composed of a protective layer, a second anti-aging layer and a second UV absorption layer, can significantly improve the weather resistance and UV resistance of the photovoltaic cable in long-term use in outdoor environments, thereby ensuring the stable operation of the photovoltaic system and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a cross-sectional view of the photovoltaic cable described in this embodiment;

[0019] Figure 2 is a schematic structural diagram of the insulating layer described in this embodiment;

[0020] Figure 3 Schematic diagram of the structure of the sheath described in this embodiment.

[0021] 1. Conductor;

[0022] 2. Insulating layer, 21. Isolating layer, 22. First anti-aging layer, 23. First ultraviolet absorbing layer;

[0023] 3. sheath, 31. protective layer, 32. second anti-aging layer, 33. second ultraviolet absorbing layer;

[0024] 4. Outer cover. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0026] In view of the technical problems of the existing highly weather-resistant and highly UV-resistant photovoltaic cables, such as complex structure, great manufacturing difficulty and high cost, the embodiment of the utility model provides a photovoltaic cable.

[0027] Figure 1 A cross-sectional view of the photovoltaic cable provided in this embodiment, Figure 2 and Figure 3 The schematic diagrams of the insulation layer and the sheath are shown in FIG. Figure 1-3 As shown, the photovoltaic cable includes a conductor 1, an insulating layer 2 and a sheath 3, wherein the insulating layer 2 includes an isolation layer 21, a first anti-aging layer 22 and a first ultraviolet absorption layer 23, and the isolation layer 21, the first anti-aging layer 22 and the first ultraviolet absorption layer 23 are sequentially wrapped around the outside of the conductor 1 from the inside to the outside; the sheath 3 includes a protective layer 31, a second anti-aging layer 32 and a second ultraviolet absorption layer 33, and the protective layer 31, the second anti-aging layer 32 and the second ultraviolet absorption layer 33 are sequentially wrapped around the outside of the first ultraviolet absorption layer 23 from the inside to the outside.

[0028] Compared with the existing highly weather-resistant and highly UV-resistant photovoltaic cables, the photovoltaic cable provided in this embodiment is composed of only a conductor 1, an insulating layer 2 and a sheath 3, and has the advantages of simple structure, convenient production and relatively low cost. At the same time, the photovoltaic cable provided in this embodiment, whose insulating layer 2 is composed of an isolation layer 21, a first anti-aging layer 22 and a first ultraviolet absorption layer 23, and the sheath 3 is composed of a protective layer 31, a second anti-aging layer 32 and a second ultraviolet absorption layer 33, can significantly improve the weather resistance and UV resistance of the photovoltaic cable in long-term use in outdoor environments, thereby ensuring the stable operation of the photovoltaic system and extending its service life.

[0029] In a preferred embodiment, the cross-section of the conductor 1 is generally selected into two specifications of 4mm2 and 6mm2, the type of conductor is the 5th type soft tinned copper conductor, the number of conductors is 50 and 75 respectively, and the maximum DC resistance of the conductor at 20°C is 5.09 and 3.39Ω / km respectively.

[0030] In a preferred embodiment, the insulation color is white, the average insulation thickness should be no less than 0.7 mm, and the thickness of the thinnest part of the insulation layer 2 should be no less than 0.58 mm.

[0031] In a preferred embodiment, the average thickness of the sheath 3 should be no less than 0.8 mm, and the thickness of the thinnest part of the sheath 3 should be greater than or equal to 0.63 mm.

[0032] In a preferred embodiment, the isolation layer 21 is a cross-linked polyethylene layer, or the isolation layer 21 is an ethylene-propylene rubber layer. The ethylene-propylene rubber layer (EPR) has high heat resistance and cold resistance, can maintain good elasticity and rigidity within the temperature range, and will not be affected by temperature changes. Its cold resistance is also very excellent, and it can even be used at a low temperature of -60°C; in addition, there are ethylene-propylene units in the molecular chain of ethylene-propylene rubber, which makes it have good chemical corrosion resistance and can work in a variety of chemical media without being damaged or deteriorated due to chemical corrosion. Therefore, the isolation layer 21 made of ethylene-propylene rubber material has a good insulation isolation effect, and the first anti-aging layer and the first ultraviolet absorption layer are sequentially arranged outside the isolation layer 21. Therefore, the entire insulation layer 2 also has good weather resistance and ultraviolet resistance.

[0033] In addition, the EPDM material also has high strength and hardness, and its elongation at break and elastic modulus are greater than those of general rubber. At the same time, the tensile and tearing strengths of EPDM are also higher than those of other rubbers, so it can withstand greater pressure and tension during application. The insulating layer 2 made of EPDM material can increase the bending radius of the photovoltaic cable, thereby improving the mechanical properties and durability of the photovoltaic cable.

[0034] In a preferred embodiment, the protective layer 31 is a silicone rubber layer, or the protective layer 31 is a fluororubber layer. Silicone rubber (SI) material has good low temperature resistance and can generally still work at -55°C. At the same time, its heat resistance is also outstanding and can work for a long time at 180°C; fluororubber (FKM) material has excellent heat resistance, oxidation resistance, oil resistance, corrosion resistance and atmospheric aging resistance. Therefore, the protective layer 31 made of fluororubber material has a good protective effect, and the first anti-aging layer 32 and the first ultraviolet absorption layer 33 are sequentially arranged on the outside of the protective layer 31. Therefore, the entire sheath 3 also has strong weather resistance and ultraviolet resistance.

[0035] In a preferred embodiment, the first anti-aging layer 22 and the second anti-aging layer 32 are made of anti-aging agents, and the anti-aging agents generally include antioxidants, antiozonants, light stabilizers and antibacterial and mildew-proof agents, etc. The first ultraviolet absorption layer 23 and the second ultraviolet absorption layer 33 are made of ultraviolet absorbers, and the ultraviolet absorbers generally include salicylates, benzophenones, benzotriazoles, substituted acrylonitriles, triazines and hindered amines, etc., which can be selected according to needs in actual use.

[0036] In a preferred embodiment, the photovoltaic cable further comprises an outer sheath 4, which is wrapped around the outside of the second ultraviolet absorbing layer 33, and is a polyurethane layer or a nylon layer. The polyurethane material is a high-performance material, including good heat insulation performance, strong corrosion resistance and waterproofness, and adjustable hardness and elasticity; and the nylon material is also a synthetic fiber with excellent performance, strong wear resistance, high strength and toughness, and easy processing, light and soft, and also has certain anti-ultraviolet performance. Therefore, the outer sheath 4 made of polyurethane material or nylon material has good weather resistance and anti-ultraviolet ability.

[0037] In summary, the photovoltaic cable provided by the utility model has the advantages of strong weather resistance and UV resistance, which can improve the stability and reliability of the photovoltaic system, reduce maintenance costs and extend service life. Specifically, the advantages include the following:

[0038] 1. Strong weather resistance and UV resistance: The insulation layer 2 is composed of an isolation layer 21, a first anti-aging layer 22 and a first UV absorption layer 23, and the sheath 3 is composed of a protective layer 31, a second anti-aging layer 32 and a second UV absorption layer 33. The weather resistance and UV resistance of the cable can be significantly improved, so that the cable can be used for a long time in outdoor environments without being damaged;

[0039] 2. Excellent mechanical properties: The structure of this utility model can withstand the challenges of various harsh environments;

[0040] 3. Wide application: suitable for various types of photovoltaic systems and outdoor environments to meet the needs of different customers.

[0041] The specific implementation methods of the utility model described above do not constitute a limitation on the protection scope of the utility model. Any other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A photovoltaic cable, characterized in that: include: conductor; An insulating layer, wherein the insulating layer comprises an isolation layer, a first anti-aging layer and a first ultraviolet absorption layer, and the isolation layer, the first anti-aging layer and the first ultraviolet absorption layer are sequentially wrapped around the outside of the conductor from the inside to the outside; The sheath comprises a protective layer, a second anti-aging layer and a second ultraviolet absorbing layer, wherein the protective layer, the second anti-aging layer and the second ultraviolet absorbing layer are sequentially wrapped around the outside of the first ultraviolet absorbing layer from the inside to the outside.

2. The photovoltaic cable according to claim 1, characterized in that: The photovoltaic cable further includes an outer sheath, which is wrapped around the outside of the second ultraviolet absorbing layer.

3. The photovoltaic cable according to claim 2, characterized in that: The outer coating is a polyurethane layer or a nylon layer.

4. The photovoltaic cable according to claim 1, characterized in that: The isolation layer is a cross-linked polyethylene layer.

5. The photovoltaic cable according to claim 1, characterized in that: The isolation layer is an ethylene-propylene rubber layer.

6. The photovoltaic cable according to claim 1, characterized in that: The protective layer is a fluororubber layer.

7. The photovoltaic cable according to claim 1, characterized in that: The protective layer is a silicone rubber layer.

8. The photovoltaic cable according to claim 1, characterized in that: The average thickness of the insulating layer is greater than or equal to 0.7 mm.

9. The photovoltaic cable according to claim 1, characterized in that: The thickness of the insulating layer at its thinnest point is greater than or equal to 0.58 mm.

10. The photovoltaic cable according to claim 1, characterized in that: The thickness of the sheath at its thinnest point is greater than or equal to 0.63 mm.

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