A reinforced double-core detachable photovoltaic cable

Abstract

The present invention proposes a reinforced dual-core detachable photovoltaic cable, which belongs to the technical field of photovoltaic cables. It comprises two groups of conductors with the same structure, each group of conductors is coated with an insulating layer, an inner tape layer, an anti-rat and ant layer, an outer tape layer and a sheath layer in sequence from the inside to the outside; the outside of the two groups of sheath layers are integrally coated with a connecting rib layer, and the connecting rib layer is connected by connecting ribs, and the connecting ribs include two arc surfaces arranged oppositely, which are easy to separate. The anti-rat and ant layer adopts a physical anti-rat and ant structure, and uses brass tapes for overlapping wrapping. While increasing the anti-rat and ant ability, it also improves the strength and impact resistance of the cable, and has the functions of safety, environmental protection and long-term effectiveness. The connecting rib layer adopts anti-rat and ant low-smoke halogen-free polyolefin material, which has good wear resistance, flame retardancy, acid and alkali resistance, low temperature resistance and high temperature resistance, and can effectively resist the gnawing of rats and ants.

Description

Technical Field

[0001] The invention belongs to the field of photovoltaic cables, and in particular relates to a reinforced double-core detachable photovoltaic cable and a preparation method thereof. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Photovoltaic cables are an indispensable and important part of solar photovoltaic power generation systems. As the backbone of power transmission of photovoltaic power generation facilities, photovoltaic cables have a direct impact on the safety, reliability and advancement of solar photovoltaic power generation systems. Given that photovoltaic power stations are usually located outdoors, and some are even located in remote mountainous areas, cables may be broken during operation due to strong external forces. In addition, photovoltaic cables located outdoors or even in remote mountainous areas are also susceptible to being bitten by rats and termites, resulting in quality risks such as short circuits or disconnections, posing a threat to the safety of the entire photovoltaic power generation system; in addition, the existing sheath layer is mostly enhanced by adding flame retardants to enhance the flame retardant properties of photovoltaic cables. The flame retardants are mostly made of metal hydroxide catalysts, which often produce a large amount of harmful gases during the combustion process, and are less environmentally friendly. Summary of the invention

[0004] In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a reinforced dual-core detachable photovoltaic cable and a preparation method thereof, which can effectively solve the technical requirements of photovoltaic cables in special usage environments, such as rat and ant resistance, high tensile strength, and separability, as well as the problem that existing cables cannot meet these special application scenarios.

[0005] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solutions:

[0006] A first aspect of the present invention provides a reinforced dual-core detachable photovoltaic cable;

[0007] A reinforced double-core detachable photovoltaic cable, comprising two groups of conductors with the same structure, each group of conductors is sequentially coated with an insulation layer, an inner tape layer, a rat and ant-proof layer, an outer tape layer and a sheath layer from the inside to the outside;

[0008] The exteriors of the two groups of sheath layers are entirely covered with connecting rib layers, and the connecting rib layers are connected by connecting ribs; the connecting ribs include two arc-shaped surfaces that are arranged oppositely.

[0009] As a further technical solution, the conductor includes a conductive metal layer and a reinforcing core.

[0010] As a further technical solution, the reinforcing core is made of copper foil wire.

[0011] As a further technical solution, the insulating layer is made of 125-degree UV-resistant and ozone-resistant cross-linked polyolefin.

[0012] As a further technical solution, the rat and ant-proof layer adopts an overlapping wrapping structure of brass strips.

[0013] As a further technical solution, the inner wrapping layer and the outer wrapping layer are wrapped with overlapping non-woven fabrics.

[0014] As a further technical solution, the sheath layer adopts a nylon material extrusion structure.

[0015] As a further technical solution, an inorganic nano flame retardant is added to the sheath layer, and the inorganic nano flame retardant is nickel-cobalt layered double hydroxide, and the preparation process is:

[0016] 0.8320 g of nickel nitrate hexahydrate, 2.0408 g of urea, 0.3125 g of ammonium fluoride, 1.6226 g of cobalt nitrate hexahydrate and 70 mL of water were prepared into a solution, and the prepared solution was stirred magnetically for 30 min;

[0017] A 1*1 cm nickel foam metal sheet was placed in the reaction solution, and then placed in a high-frequency alternating magnetic field, and high-frequency alternating current was input for heating for 10 minutes;

[0018] An ethanol solvent is added and ultrasonic treatment is performed to vibrate the nano flame retardant generated by the reaction off the nickel foam metal sheet, and finally a drying treatment is performed at a temperature of 60° C. to obtain an inorganic nano flame retardant.

[0019] As a further technical solution, the connecting rib layer is made of rat- and ant-proof low-smoke halogen-free polyolefin material.

[0020] As a further technical solution, capsaicin particles are also provided on the outer surface of the connecting rib layer.

[0021] One or more of the above technical solutions have the following beneficial effects:

[0022] (1) The conductor in the present invention is reinforced by a reinforcing core, which can effectively enhance the overall strength of the cable. An inorganic nano flame retardant is also added to the sheath layer, which does not produce harmful gases, has high flame retardant efficiency, good environmental protection, and little effect on the performance of the material.

[0023] (2) The present invention adds a metal strip anti-rat and ant layer on the basis of ordinary photovoltaic cables, changing the traditional chemical anti-rat and ant structure of adding pungents to the sheath, and adopts a physical anti-rat and ant structure. While increasing the anti-rat and ant ability, the strength and impact resistance of the cable are improved, and it has the functions of safety, environmental protection, and long-term effectiveness.

[0024] (3) The sheath of the present invention is made of nylon material, which is 5 times stronger than ordinary polyolefin materials, and has high strength, making it difficult for rats and ants to bite. The sheath layer is made of nylon material extrusion structure, with a thickness of not less than 0.8 mm, and is produced by an extrusion die with a low stretch ratio, and an outer tape layer is provided between the rat-proof layer and the sheath layer, which effectively solves the problem of sheath shrinkage caused by the temperature difference between the metal interface and the non-metal interface.

[0025] (4) The connecting rib layer of the present invention is made of rat- and ant-proof low-smoke halogen-free polyolefin material, and capsaicin particles are arranged on the outer surface, which can effectively resist the gnawing of rats and ants, and avoid the situation where the cable model cannot be identified due to the gnawing of rats and ants.

[0026] (5) The connecting ribs in the middle of the connecting rib layer of the present invention can be separated, a special mold is designed, and a connecting rib channel is provided, so that the two-core cables can be torn from the middle and used independently without reducing their performance, thereby improving the installation and laying efficiency of the cable, thereby enhancing the safety, reliability and advancement of the solar photovoltaic power generation system.

[0027] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0029] Figure 1 Schematic diagram of the structure of the photovoltaic cable in the first embodiment.

[0030] Figure 2 Schematic diagram of the conductor structure of the photovoltaic cable in the first embodiment.

[0031] Figure 3 This is a schematic diagram of the preparation process of the inorganic nano flame retardant in the photovoltaic cable sheath layer in the first embodiment.

[0032] In the figure, 1 is the conductor; 2 is the insulation layer; 3 is the inner tape layer; 4 is the rat and ant proof layer; 5 is the outer tape layer; 6 is the sheath layer; 7 is the connecting rib layer; 8 is the connecting rib; 9 is the metal conductive layer; 10 is the reinforcing core DETAILED DESCRIPTION

[0033] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0034] It should be noted that the terms used herein are for describing specific embodiments only and are not intended to be limiting of exemplary embodiments according to the present invention.

[0035] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0036] Embodiment 1

[0037] This embodiment discloses a reinforced dual-core detachable photovoltaic cable.

[0038] like Figure 1 As shown, a reinforced double-core detachable photovoltaic cable comprises two groups of conductors 1 with the same structure, each group of conductors is sequentially coated with an insulating layer 2, an inner tape layer 3, a rat and ant-proof layer 4, an outer tape layer 5 and a sheath layer 6 from the inside to the outside;

[0039] In this embodiment, the conductor 1 is composed of a conductive metal layer 9 and a reinforcing core 10. The conductive metal layer 9 includes one or a combination of tinned copper conductor, nickel-plated copper conductor, silver-plated copper conductor, tinned aluminum conductor, and tinned aluminum alloy conductor. The conductive layer mainly plays the role of transmitting electrical energy. The plated metal layer can make the conductive layer material less prone to oxidation and increase its service life. In this embodiment, the conductive metal layer 9 is made of 25mm 2 The 5th type of tinned copper conductor of the specification is twisted into 189 0.40mm tinned copper monofilaments, which meets the relevant index requirements of the 5th type of tinned copper conductor specified in GB / T 3956 standard.

[0040] The reinforcing core 10 is wound with 8 copper foil wires, each of which has a diameter of 0.2 mm, which can increase the overall strength and stability of the photovoltaic cable and reduce the expansion and contraction of the core.

[0041] The insulating layer 2 is made of photovoltaic special materials, which are 125-degree UV-resistant and ozone-resistant radiation cross-linked polyolefin. It is made by adding 2 parts of UV protection agent and 2 parts of anti-aging agent AW to the radiation cross-linked polyolefin of ordinary material. Its insulation thickness is 0.7mm and it has good acid and alkali resistance and high and low temperature conversion resistance.

[0042] The rat-proof and ant-proof layer 4 is made of a 0.13 mm thick brass tape overlapped and wrapped, and the brass tape overlap rate is controlled at 10% to 20%. The rat-proof and ant-proof layer 4 is a physical rat-proof and ant-proof layer, which can effectively enhance the rat-proof and ant-proof function of the photovoltaic cable. At the same time, as a metal protective layer, it can improve the strength and toughness of the photovoltaic cable, and has the functions of safety, environmental protection, and long-term effectiveness.

[0043] The inner and outer layers of the rat-ant-proof layer are respectively coated with an inner tape layer 3 and an outer tape layer 5, and the inner tape layer 3 and the outer tape layer 5 are non-woven overlapping wrapping structures, and the non-woven overlapping rate is 10% to 20%, and the thickness is not less than 0.2 mm. The use of non-woven wrapping can effectively isolate the influence of the external environment on the photovoltaic cable and prevent the photovoltaic cable from contacting the outside world. At the same time, it can also isolate the erosion of chemical substances such as water, oil, acid and alkali, and improve the service life of the photovoltaic cable. In addition, the use of non-woven wrapping also has good compressive resistance, can withstand a certain pressure, and keep the photovoltaic cable at a certain strength and shape. At the same time, since the rat-ant-proof layer 4 is wrapped with brass tape, the temperature difference between the metal interface and the non-metal interface is likely to cause the sheath layer 6 to shrink when it contacts the sheath layer 6. Therefore, the above problem can be effectively solved by arranging the outer tape layer 5 between the rat-ant-proof layer 4 and the sheath layer 6.

[0044] Inorganic nano flame retardant is added to the sheath layer 6. Taking the preparation of NiCo-LDH (nickel cobalt layered double hydroxide) as an example, NiCo-LDH can be decomposed into CO2, H2O and metal oxides during combustion. These products can dilute combustible gas and oxygen, reduce the temperature during combustion, and the formed metal oxides help to form a carbon layer, isolate oxygen and heat, and further reduce the degradation rate of the substrate. In addition, NiCo-LDH itself does not contain any toxic substances and is an ideal flame retardant and smoke suppression type green flame retardant.

[0045] Combination Figure 3 The preparation process of the inorganic nano flame retardant is as follows: prepare cobalt nitrate hexahydrate and nickel nitrate hexahydrate solutions, and add surfactants; take 0.8320g nickel nitrate hexahydrate, 2.0408g urea, 0.3125g ammonium fluoride, 1.6226g cobalt nitrate hexahydrate and 70mL water to prepare a solution, and stir the prepared solution magnetically for 30 minutes;

[0046] A 1*1cm nickel foam sheet was placed in the reaction solution, and then placed in a high-frequency alternating magnetic field. A high-frequency alternating current was input for heating for 10 minutes. The current passed through the spiral hollow copper tube, forming an eddy current to generate an alternating magnetic field. This alternating magnetic field can generate an induced current of the same frequency in the metal sheet, which can quickly heat the surface of the metal sheet and heat the workpiece to an extremely high temperature in a very short time, thereby heating the solution near the metal sheet to cause a reaction. Subsequently, an ethanol solvent was added and ultrasonic treatment was performed to vibrate the nano flame retardant generated by the reaction off the nickel foam sheet, and finally dried at a temperature of 60°C to obtain an inorganic nano flame retardant NiCo-LDH.

[0047] Furthermore, the sheath layer 6 adopts a nylon material extrusion structure, and adopts a single screw extruder equipped with an extrusion die to evenly and tightly extrude the nylon material on the outer tape layer 5 to form the sheath layer 6. The thickness of the sheath layer 6 is 0.8 mm. The sheath layer 6 is made of nylon material, and the strength of nylon material is 5 times that of ordinary polyolefin material, and the strength is high, which can further prevent rats and ants from biting.

[0048] The two sets of sheath layers 6 are covered with a connecting rib layer 7, which connects the two sets of conductors 1 through connecting ribs 8. The connecting rib layer 7 is made of rat-proof, low-smoke, halogen-free polyolefin material, which has good wear resistance, flame retardancy, acid and alkali resistance, low temperature resistance, and high temperature resistance. 2 Taking the photovoltaic cable of the specification as an example, its connecting rib 8 is 7mm long and 1.2mm wide. The connecting rib 8 in the middle of the connecting rib layer 7 can be separated. The connecting rib 8 includes two relatively arranged arc surfaces, which can enable the two-core photovoltaic cables to be torn from the middle and used independently without reducing their performance, thereby improving the installation and laying efficiency of the cable, thereby enhancing the safety, reliability and advancement of the solar photovoltaic power generation system. In the process of coating the connecting rib layer 7, by using a 90 extruder equipped with a two-core detachable special mold, the rat-ant-proof low-smoke halogen-free polyolefin material is evenly and tightly extruded on the sheath layer 6, and the extrusion thickness is not less than 0.4mm to form a connecting rib layer 7. In order to further prevent rats and ants from gnawing on the photovoltaic cable, capsaicin particles are provided on the outer surface of the connecting rib layer 7. Due to the stimulation of capsaicin, rats and ants can be effectively repelled from gnawing.

[0049] Embodiment 2

[0050] The other contents of this embodiment are the same as those of the first embodiment, except that the conductor 1 is a tin-plated aluminum alloy conductor.

[0051] Embodiment 3

[0052] The other contents of this embodiment are the same as those of the first embodiment, except that the rat- and ant-proof layer 4 is made of steel strip material.

[0053] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A reinforced dual-core detachable photovoltaic cable, characterized in that: It comprises two groups of conductors with the same structure, each group of conductors is sequentially covered with an insulating layer, an inner tape layer, a rat and ant-proof layer, an outer tape layer and a sheath layer from the inside to the outside; The exteriors of the two groups of sheath layers are entirely covered with connecting rib layers, and the connecting rib layers are connected by connecting ribs; the connecting ribs include two arc-shaped surfaces that are arranged oppositely.

2. A reinforced dual-core detachable photovoltaic cable as claimed in claim 1, characterized in that: The conductor includes a conductive metal layer and a reinforcing core.

3. A reinforced dual-core detachable photovoltaic cable as claimed in claim 2, characterized in that: The reinforcing core is made of copper foil wire.

4. A reinforced dual-core detachable photovoltaic cable as claimed in claim 1, characterized in that: The insulating layer is made of 125-degree UV-proof and ozone-resistant cross-linked polyolefin.

5. A reinforced dual-core detachable photovoltaic cable as claimed in claim 1, characterized in that: The rat and ant-proof layer adopts an overlapping and wrapped structure of brass strips.

6. A reinforced dual-core detachable photovoltaic cable as claimed in claim 1, characterized in that: The inner wrapping layer and the outer wrapping layer are both wrapped with overlapping non-woven fabrics.

7. A reinforced dual-core detachable photovoltaic cable as claimed in claim 1, characterized in that: The sheath layer adopts a nylon material extrusion structure.

8. A reinforced dual-core detachable photovoltaic cable as claimed in claim 1, characterized in that: An inorganic nano flame retardant is added to the sheath layer, and the inorganic nano flame retardant is nickel-cobalt layered double hydroxide, and the preparation process is as follows: 0.8320 g of nickel nitrate hexahydrate, 2.0408 g of urea, 0.3125 g of ammonium fluoride, 1.6226 g of cobalt nitrate hexahydrate and 70 mL of water were prepared into a solution, and the prepared solution was stirred magnetically for 30 min; A 1*1 cm nickel foam metal sheet was placed in the reaction solution, and then placed in a high-frequency alternating magnetic field, and high-frequency alternating current was input for heating for 10 minutes; An ethanol solvent is added and ultrasonic treatment is performed to vibrate the nano flame retardant generated by the reaction off the nickel foam metal sheet, and finally a drying treatment is performed at a temperature of 60° C. to obtain an inorganic nano flame retardant.

9. A reinforced dual-core detachable photovoltaic cable as claimed in claim 1, characterized in that: The connecting rib layer is made of rat-proof, ant-proof, low-smoke, halogen-free polyolefin material.

10. The reinforced dual-core detachable photovoltaic cable according to claim 1, characterized in that: Capsaicin particles are also arranged on the outer surface of the connecting rib layer.

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