Protective photovoltaic cable

Abstract

The utility model discloses a protective photovoltaic cable, which relates to the technical field of cables and comprises a conductor, an insulating layer, an inner isolating layer, a protective layer, an outer isolating layer and an outer sheath layer. According to the utility model, the cold resistance, high temperature resistance and flame resistance of the cable are effectively improved by adopting the insulating layers and the outer sheath layer which are made of XLPE materials, the steel wire protection layer is arranged to resist external force damage, the cable has excellent bending performance and overload resistance, and the wrapped double isolation layers reduce friction, resist wear, improve core wire protection and prolong the service life, so that the cable is suitable for large-scale popularization and application. The safety of the cable is improved, the personal safety is ensured, the steel wire protection layer can continue to work without being afraid of big fire combustion when a fire disaster occurs due to external reasons and self reasons of a photovoltaic system, the reliability of the photovoltaic cable is ensured, the high temperature resistance, low temperature resistance, fire resistance, flame retardance and damage resistance of the cable are effectively improved through the arrangement of the multi-layer structure, and the service life of the cable is prolonged. The safety of the product is improved, and the harm of the product to people is reduced.

Description

Technical Field

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

[0002] With the development of human science and technology, it is found that environmental pollution is urgent. Photovoltaic power generation technology is one of the green and clean energy sources of the future. Most photovoltaic power generation systems are installed outdoors (such as at the seaside, in the desert, in houses, directly buried, etc.), and are exposed to harsh conditions such as high temperature (cable temperature under load is 70℃) and ultraviolet radiation, rain, sunny days, etc. all year round.

[0003] At present, on the market, photovoltaic cable connecting wires are tinned conductors that are twisted and then extruded with insulation and finally extruded sheaths. Among them, the insulation and sheath materials used for the connecting wires are PVC, TPE, and chloroprene rubber. The working temperature of the above materials is between -15℃ and 90℃. The materials have poor flame retardancy, poor weather resistance, and poor resistance to mechanical damage. They can no longer meet the use of this type of cable under low temperature, external force damage and harsh environmental conditions, affecting the service life of the photovoltaic system. In severe cases, it will cause short circuits and fires that endanger personal safety. In addition, PVC materials are not environmentally friendly (containing halogens) and have poor bending properties under low temperature conditions; TPE has poor flame retardant properties and a low safety factor; chloroprene rubber materials have low temperature resistance and cannot meet the long-term use of cables at 100℃ under high load; and they are easily damaged by machinery, resulting in skin breakage and leakage. Therefore, it is necessary to develop a photovoltaic cable with good flame retardancy, excellent heat resistance, good weather resistance, and good protection. Utility Model Content

[0004] The purpose of the utility model is to provide a protective photovoltaic cable in order to solve the above-mentioned problems.

[0005] To achieve the above object, the utility model provides the following technical solutions: a protective photovoltaic cable, comprising a conductor, the outer side of the conductor is wrapped with an insulating layer, the outer side of the insulating layer is wrapped with an inner isolation layer, and the inner isolation layer is wrapped with a protective layer, which is used to increase the tensile strength and anti-external mechanical force damage protection of the cable;

[0006] The outer side of the protective layer is wrapped with an outer insulating layer for fixing the protective layer, and the outer side of the outer insulating layer is wrapped with an outer sheath layer. The insulating layer and the outer sheath layer are used to increase the high temperature resistance, low temperature resistance and flame retardancy of the cable.

[0007] As a further solution of the utility model: the inner side of the outer sheath layer is formed with a first deformation arc groove, a second deformation arc groove, and a shrinkage hole, the second deformation arc groove is distributed on the inner side of the first deformation arc groove and is staggered with the first deformation arc groove, and the shrinkage hole is distributed on the inner side of the second deformation arc groove. The first deformation arc groove, the second deformation arc groove, and the shrinkage hole are used to increase the deformation compression resistance of the outer sheath layer.

[0008] As a further solution of the utility model: the interior of the second deformation arc groove and the shrinkage hole is filled with rubber strips to increase the restoring elastic force for the deformation of the outer sheath layer.

[0009] As a further solution of the utility model: the insulation layer and the outer sheath layer are made of cold-resistant XLPE material, and the insulation layer and the outer sheath layer are semi-extruded, and the outer sheath layer, the first deformation arc groove, the second deformation arc groove, and the second deformation arc groove are extruded as a whole.

[0010] As a further solution of the utility model: the inner isolation layer and the outer isolation layer are formed by winding with PTFE tape, and the protective layer is formed by loosely winding with high-strength stainless steel wire.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] By setting up the insulation layer and outer sheath layer made of XLPE material, the cable's cold resistance, high temperature resistance, and flame retardancy are effectively improved. The steel wire protective layer can resist external damage and has excellent bending performance and overload resistance. The wrapped double-layer isolation layer reduces friction, resists wear, improves core wire protection and life, improves cable safety, and ensures personal safety. When a fire occurs due to external reasons or internal reasons in the photovoltaic system, the steel wire protective layer is not afraid of the fire and can continue to work, ensuring the reliability of the photovoltaic cable. The above multi-layer structure is effectively set up to improve the cable's high temperature resistance, low temperature resistance, fire resistance, flame retardancy, and destructive resistance, improve the product's own safety, and reduce the product's harm to people. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 It is a cross-sectional view of the multi-layer structure of the utility model;

[0015] Figure 3 This is a schematic diagram of the structure of the utility model after the rubber strip is removed.

[0016] In the figure: 1. conductor; 2. insulating layer; 3. inner isolation layer; 4. protective layer; 5. outer isolation layer; 6. outer sheath layer; 7. first deformation arc groove; 8. second deformation arc groove; 9. shrinkage hole; 10. rubber strip. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figures 1 to 3 In an embodiment of the utility model, a protective photovoltaic cable includes a conductor 1 formed by first bundling 19 tinned copper wires and then re-twisting them in a regular structure, the outer side of the conductor 1 is wrapped with an insulating layer 2, the outer side of the insulating layer 2 is wrapped with an inner isolation layer 3, and the inner isolation layer 3 is wrapped with a protective layer 4, which is used to increase the tensile strength and anti-external mechanical force damage protection of the cable;

[0019] The outer side of the protective layer 4 is wrapped with an outer isolation layer 5 for fixing the protective layer 4, and the outer side of the outer isolation layer 5 is wrapped with an outer sheath layer 6, which is used to increase the high temperature resistance, low temperature resistance and flame retardancy of the cable through the insulating layer 2 and the outer sheath layer 6;

[0020] The insulation layer 2 and the outer sheath layer 6 are made of cold-resistant XLPE material, and the insulation layer 2 and the outer sheath layer 6 are semi-extruded;

[0021] The inner isolation layer 3 and the outer isolation layer 5 are formed by winding with PTFE tape, and the protective layer 4 is formed by loosely winding with high-strength 304 stainless steel wire.

[0022] In this embodiment: the cable takes 1x50mm² conductor 1 as an example: the conductor 1 of the cable is 400*0.40 tinned copper wire, and the conductor material is 5th type tinned copper wire, which is first bundled and then re-twisted in a regular structure of 19 strands. During re-twisting, the cabling machine is equipped with a back-twisting device to eliminate the stress generated by re-twisting, so that the wire is more round and soft;

[0023] The insulation layer 2 is made of cold-resistant XLPE material with a hardness of 95A±3A and a rated temperature of -40 to 125°C. The conductor 1 is wrapped with a semi-extruded insulation layer 2, thereby leaving a certain space for the internal conductor 1. The thickness of the insulation layer is set according to the voltage (not less than 1.4mm);

[0024] The inner isolation layer 3 is made of PTFE tape, which has good high temperature resistance and wear resistance, thereby protecting the insulating layer 2 and the conductor 1, while reducing the friction between the protective layer and the insulating layer 2 and improving the high temperature resistance of the conductor 1;

[0025] The wire protection layer 4 is made of high-strength 304 stainless steel wire loosely wound to increase the cable's tensile strength and resistance to external mechanical damage.

[0026] The outer isolation layer 5 is made of PTFE tape, which has the function of fixing the steel wire of the wire protection layer 4, thereby maintaining the stability of the armor;

[0027] The outer sheath layer 6 is made of cold-resistant XLPE material with a hardness of 85A±3A and a rated temperature of -40 to 125°C. The thickness of the sheath is set according to the voltage (not less than 1.80mm);

[0028] The XLPE layer has excellent cold resistance. XLPE has certain bending performance at -40℃. It is used in cold places. The temperature of photovoltaic cables often exceeds 70℃ when fully loaded. XLPE can work stably at a rated high temperature of 125℃ to ensure the stability of the photovoltaic system. The XLPE material has a small specific gravity, a small shrinkage rate, and is easy to color. In addition, XLPE has excellent flame retardancy. The steel wire protective layer can resist external damage. After processing and forming, the photovoltaic cable can meet the requirements of the bundled American FT4 flame retardant standard. It has excellent bending performance and overload resistance. The wrapped double-layer isolation layer reduces friction, resists wear, improves core wire protection and life, improves cable safety, and ensures personal safety. When a fire occurs due to external reasons or internal reasons in the photovoltaic system, the steel wire protective layer is not afraid of burning and can continue to work, ensuring the reliability of the photovoltaic cable.

[0029] The above multi-layer structure can effectively improve the cable's high temperature resistance, low temperature resistance, fire resistance, and damage resistance, thereby improving the product's own safety and reducing the product's harm to humans.

[0030] Please refer to Figures 1 to 3 The inner side of the outer sheath layer 6 is formed with a first deformation arc groove 7, a second deformation arc groove 8, and a shrinkage hole 9. The second deformation arc groove 8 is distributed on the inner side of the first deformation arc groove 7 and is staggered with the first deformation arc groove 7. The shrinkage hole 9 is distributed on the inner side of the second deformation arc groove 8. The first deformation arc groove 7, the second deformation arc groove 8, and the shrinkage hole 9 are used to increase the deformation and compression resistance of the outer sheath layer 6;

[0031] The second deformation arc groove 8 and the shrinkage hole 9 are filled with a rubber strip 10, which is used to increase the restoring elastic force for the deformation of the outer sheath layer 6;

[0032] The outer sheath layer 6 , the first deformation arc groove 7 , the second deformation arc groove 8 , and the second deformation arc groove 8 are integrally formed by extrusion.

[0033] In this embodiment: by setting the first deformation arc groove 7, the second deformation arc groove 8, and the shrinkage hole 9, the outer sheath layer 6 has good deformation and shrinkage performance when subjected to external impact and extrusion, thereby buffering the external impact and preventing the external impact from being transmitted to the inner layer of the cable, thereby ensuring the structural integrity of the inner layer of the cable. The setting of the rubber strip 10 is used to provide better reset elasticity for the deformation reset of the outer sheath layer 6, thereby effectively improving the overall impact resistance of the cable.

[0034] What is described above 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 protective photovoltaic cable, comprising a conductor (1), characterized in that: The conductor (1) is wrapped with an insulating layer (2) on the outside, the insulating layer (2) is wrapped with an inner insulating layer (3) on the outside, and the inner insulating layer (3) is wrapped with a protective layer (4) for increasing the tensile strength of the cable and the ability to protect against external mechanical damage; The outer side of the protective layer (4) is wrapped with an outer insulating layer (5) for fixing the protective layer (4); the outer side of the outer insulating layer (5) is wrapped with an outer sheath layer (6); the insulating layer (2) and the outer sheath layer (6) are used to increase the high temperature resistance, low temperature resistance and flame retardancy of the cable.

2. A protective photovoltaic cable according to claim 1, characterized in that: The inner side of the outer sheath layer (6) is formed with a first deformation arc groove (7), a second deformation arc groove (8), and a shrinkage hole (9); the second deformation arc groove (8) is distributed on the inner side of the first deformation arc groove (7) and is staggered with the first deformation arc groove (7); the shrinkage hole (9) is distributed on the inner side of the second deformation arc groove (8); and the first deformation arc groove (7), the second deformation arc groove (8), and the shrinkage hole (9) are used to increase the deformation and compression resistance of the outer sheath layer (6).

3. A protective photovoltaic cable according to claim 2, characterized in that: The interior of the second deformation arc groove (8) and the shrinkage hole (9) is filled with a rubber strip (10) for increasing the restoring elastic force for the deformation of the outer jacket layer (6).

4. A protective photovoltaic cable according to claim 2, characterized in that: The insulating layer (2) and the outer sheath layer (6) are made of cold-resistant XLPE material, and the insulating layer (2) and the outer sheath layer (6) are semi-extruded, and the outer sheath layer (6), the first deformation arc groove (7), the second deformation arc groove (8), and the second deformation arc groove (8) are integrally formed by extrusion.

5. A protective photovoltaic cable according to claim 1, characterized in that: The inner isolation layer (3) and the outer isolation layer (5) are formed by winding PTFE tape, and the protective layer (4) is formed by loosely winding high-strength 304 stainless steel wire.

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