Photovoltaic cable floating on water

Abstract

The invention discloses a water floating type photovoltaic cable which comprises a conductor, an insulating layer, a waterproof layer and an outer protective layer, the conductor is arranged in the photovoltaic cable, the insulating layer wraps the outer wall of the conductor, the waterproof layer is arranged on the periphery of the insulating layer and used for preventing water from entering the photovoltaic cable, and the outer protective layer is arranged on the outer side of the photovoltaic cable. The photovoltaic cable further comprises a floating part, the floating part is located between the insulating layer and the waterproof layer, the density of the floating part is smaller than the average density of the photovoltaic cable, the water floating type photovoltaic cable can float on water when laid, the pulling force borne by the photovoltaic cable due to the gravity of the photovoltaic cable is reduced, the service life of the photovoltaic cable is prolonged, and the water floating type photovoltaic cable is suitable for popularization and application. And meanwhile, the maintenance convenience is improved.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic power generation equipment, and in particular to a water floating photovoltaic cable. Background Art

[0002] In the related technologies, with the large-scale and rapid development of the photovoltaic power generation industry, the scale of photovoltaic power stations has become larger and larger, which has seriously squeezed the surrounding land resources. At the same time, the reflected light generated by photovoltaic power stations has caused light pollution to the surrounding residents or wild animals, affecting their normal lives. The construction of water photovoltaic power stations in reservoirs, lakes, swamps and offshore areas far away from residential areas has higher power generation efficiency because there are no tall buildings or mountains on the water surface. At the same time, the local climate and water surface conditions are fully utilized to achieve three-dimensional and efficient utilization of solar energy and water surface resources, and improve the comprehensive utilization efficiency per unit water surface area. With the development of water photovoltaic power stations, there are more requirements for its supporting facilities, such as photovoltaic cables. Ordinary photovoltaic cables are difficult to be laid in water for a long time, and heavy waterproof cables need to be sunk to the bottom of the water when laid, which increases the difficulty of daily maintenance of cables and affects the wind and wave resistance requirements of photovoltaic power stations. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a floating photovoltaic cable, which can float on water and improve the convenience of maintenance.

[0004] The floating photovoltaic cable according to the embodiment of the present invention comprises:

[0005] A conductor, arranged inside the photovoltaic cable;

[0006] An insulating layer, covering the outer wall of the conductor;

[0007] A waterproof layer, disposed on the outer periphery of the insulating layer, for preventing moisture from entering the interior of the photovoltaic cable;

[0008] An outer sheath, arranged on the outside of the photovoltaic cable;

[0009] Wherein, the photovoltaic cable further comprises a floating member, wherein the floating member is located between the insulating layer and the waterproof layer, and the density of the floating member is less than the average density of the photovoltaic cable.

[0010] The water-floating photovoltaic cable of the embodiment of the present invention can float on the water when being laid, thereby reducing the pulling force on the photovoltaic cable due to its own gravity, increasing the service life of the photovoltaic cable, and improving the convenience of maintenance.

[0011] According to some embodiments of the present invention, the floating member is a plastic member made of foamed polyethylene material, and the cross-section of the plastic member is semicircular.

[0012] According to some embodiments of the present invention, the photovoltaic cable is provided with two groups of the floating members, and the two groups of the floating members are respectively located on two sides of the photovoltaic cable.

[0013] According to some embodiments of the present invention, the cross-section of the photovoltaic cable is elliptical, the conductor is provided in multiple pieces, the multiple conductors are spaced apart along the long axis of the ellipse, and the two groups of floating members are located on both sides of the multiple conductors along the long axis of the ellipse.

[0014] According to some embodiments of the present invention, the photovoltaic cable further comprises a water-blocking filling layer, the water-blocking filling layer fills the gap between the insulating layer and the waterproof layer, and the floating member is disposed in the water-blocking filling layer.

[0015] According to some embodiments of the present invention, the water-blocking filling layer is composed of a plurality of strands of water-blocking filling ropes, which fill the gap between the insulating layer and the waterproof layer and are wrapped around the outside of the floating member.

[0016] According to some embodiments of the present invention, the waterproof layer is a double-sided aluminum-plastic composite tape, and the double-sided aluminum-plastic composite tape is coated on the outer wall of the water-blocking filling layer.

[0017] According to some embodiments of the present invention, the photovoltaic cable further includes a bearing member, and the bearing member is disposed in the outer sheath.

[0018] According to some embodiments of the present invention, the outer protective layer is made of nitrile rubber, and the nitrile rubber is coated on the outer side of the bearing component.

[0019] According to some embodiments of the present invention, the bearing member is a galvanized steel wire rope, and the galvanized steel wire rope is arranged along the length direction of the photovoltaic cable.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0022] Figure 1 This is a schematic structural diagram of a cross section of a water floating photovoltaic cable according to an embodiment of the present invention;

[0023] Reference numerals:

[0024] 100, conductor; 200, insulation layer; 300, waterproof layer; 400, outer sheath; 500, floating part; 600, water-blocking filling layer; 700, load-bearing part. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0026] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0028] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0029] In the related technologies, with the large-scale and rapid development of the photovoltaic power generation industry, the scale of photovoltaic power stations has become larger and larger, which has seriously squeezed the surrounding land resources. At the same time, the reflected light generated by photovoltaic power stations has caused light pollution to the surrounding residents or wild animals, affecting their normal lives. The construction of water photovoltaic power stations in reservoirs, lakes, swamps and offshore areas far away from residential areas has higher power generation efficiency because there are no tall buildings or mountains on the water surface. At the same time, the local climate and water surface conditions are fully utilized to achieve three-dimensional and efficient utilization of solar energy and water surface resources, and improve the comprehensive utilization efficiency per unit water surface area. With the development of water photovoltaic power stations, there are more requirements for its supporting facilities, such as photovoltaic cables. Ordinary photovoltaic cables are difficult to be laid in water for a long time, and heavy waterproof cables need to be sunk to the bottom of the water when laid, which increases the difficulty of daily maintenance of cables and affects the wind and wave resistance requirements of photovoltaic power stations.

[0030] To this end, the present invention provides a water-floating photovoltaic cable, which can enable the optical cable to float on water.

[0031] Reference Figure 1In some embodiments of the present invention, a floating photovoltaic cable includes a conductor 100, an insulating layer 200, a waterproof layer 300 and an outer sheath 400. The conductor 100 is arranged inside the photovoltaic cable and is made of a Class 5 silver-plated copper conductor 100. The surface resistance of the single wire of the silver-plated copper conductor 100 is small, so that the overall conductivity can be effectively improved. At the same time, the silver-plated copper conductor 100 has good antioxidant properties, can effectively resist oxidation and corrosion in the use environment of the photovoltaic cable, protect the conductor 100 from damage, and thus greatly extend the service life of the photovoltaic cable. The insulating layer 200 is coated on the outer wall of the conductor 100, thereby isolating the conductor 100 from the outside and playing an insulating role. Specifically, the insulating layer 200 is made of ultraviolet irradiation cross-linked polyethylene. The material density of ultraviolet irradiation cross-linked polyethylene is small, and the performance to water is particularly stable. Its water absorption rate in water is only 0.01%. Therefore, the insulating layer 200 made of ultraviolet irradiation cross-linked polyethylene enables the photovoltaic cable of the present invention to maintain excellent electrical insulation performance in moisture or water. The waterproof layer 300 is arranged on the periphery of the insulating layer 200, and the waterproof layer 300 can prevent moisture from entering the interior of the photovoltaic cable. The outer sheath 400 is arranged on the outside of the photovoltaic cable. As the outermost layer of the photovoltaic cable, the outer sheath 400 can protect the internal structure of the photovoltaic cable. The photovoltaic cable of the present invention also includes a floating member 500, which is located between the insulating layer 200 and the waterproof layer 300. The density of the floating member 500 is less than the average density of the photovoltaic cable, thereby making the overall density of the photovoltaic cable smaller. Specifically, the density of the floating member 500 is less than one-fifth of the density of water. Therefore, when the volume ratio of the floating member 500 in the photovoltaic cable is appropriate, the overall density of the photovoltaic cable can be made less than the density of water, so that the photovoltaic cable can float on the water when it is laid, reducing the pulling force on the photovoltaic cable due to its own gravity, improving the service life of the photovoltaic cable, and improving the convenience of maintenance.

[0032] It is understood that in some embodiments of the present invention, the floating member 500 is a plastic member made of a foamed polyethylene material, and the cross section of the plastic member is semicircular. The density of the foamed polyethylene material is very small, and can even reach one percent of the water density. Therefore, when the floating member 500 is made of a foamed polyethylene material, the overall density of the photovoltaic cable can be greatly reduced. In addition, the semicircular floating member 500 can be better placed between the insulating layer 200 and the waterproof layer 300, and the processing is also more convenient. Specifically, the floating member 500 is a long strip, and its cross section is semicircular, so that the floating effect of the photovoltaic cable on the water can be greatly improved. In some embodiments, the density of the floating member 500 is 0.02-0.08 of the water density, and the volume is 0.2-0.6 of the overall volume of the photovoltaic cable. At this time, the overall average density of the photovoltaic cable is 0.6-0.9 of the water density, so that the photovoltaic cable can float on the water surface without sinking to the bottom of the water.

[0033] It can be understood that in some embodiments of the present invention, the photovoltaic cable is provided with two groups of floating members 500, and the two groups of floating members 500 are respectively located on both sides of the photovoltaic cable, so that the two sides of the photovoltaic cable can achieve force balance. When the photovoltaic cable is laid on the water surface, the two sides of the photovoltaic cable can float due to the force, thereby preventing one side of the photovoltaic cable from flipping over and causing the photovoltaic cable to be subjected to a large torque.

[0034] It is understood that in some embodiments of the present invention, the cross section of the photovoltaic cable is an ellipse, the conductor 100 is provided with multiple pieces, the multiple pieces of conductors 100 are spaced apart along the long axis of the ellipse, and the two groups of floating pieces 500 are located on both sides of the multiple pieces of conductors 100 along the long axis of the ellipse. By setting as above, the area of ​​contact between the photovoltaic cable and the water is larger, which is conducive to improving the buoyancy of the photovoltaic cable. At the same time, when the waves hit the photovoltaic cable from the side, the two sides of the elliptical photovoltaic cable can play a shunting role to disperse the waves, so as to further reduce the direct impact of the waves on the photovoltaic cable, so that the line of the photovoltaic cable is more stable during operation. In addition, since the multiple pieces of conductors 100 are spaced apart along the long axis of the ellipse, the two groups of floating pieces 500 are located on both sides of the multiple pieces of conductors 100 along the long axis of the ellipse, so that the gravity of the photovoltaic cable can be distributed more evenly along the long axis direction of the ellipse, which is further conducive to improving the stability of the photovoltaic cable on the water surface, and preventing the photovoltaic cable from flipping over and causing the torsion to increase and causing the photovoltaic cable to break, greatly improving the wind and wave resistance of the photovoltaic cable, and improving the service life of the photovoltaic cable. Specifically, the major axis length of the elliptical cross-section of the photovoltaic cable is 2.5 to 8 times the minor axis length. At this time, the photovoltaic cable can better lie on the water surface, thereby making the photovoltaic cable more resistant to wind and waves.

[0035] It is understandable that in some embodiments of the present invention, the photovoltaic cable further includes a water-blocking filling layer 600, which is filled in the gap between the insulating layer 200 and the waterproof layer 300, and the floating member 500 is disposed in the water-blocking filling layer 600. The density of the water-blocking filling layer 600 is smaller than that of water, and can also improve the floating effect of the photovoltaic cable, and the water-blocking filling layer 600 can prevent water or moisture from entering the interior of the waterproof layer 300, which is beneficial to improving the waterproof performance of the photovoltaic cable.

[0036] It is understandable that in some embodiments of the present invention, the water-blocking filling layer 600 is composed of multiple strands of water-blocking filling ropes, which fill the gap between the insulating layer 200 and the waterproof layer 300 and are wrapped around the outside of the floating member 500. When the water-blocking filling ropes meet water, they will swell and form a jelly, thereby filling the gap between the insulating layer 200 and the waterproof layer 300, so that water cannot continue to enter the waterproof layer 300, greatly improving the waterproof performance of the photovoltaic cable. Specifically, the water-blocking filling ropes are arranged along the longitudinal direction of the photovoltaic cable, which can prevent water or moisture from entering the interior of the photovoltaic cable along the longitudinal direction.

[0037] It can be understood that in some embodiments of the present invention, the waterproof layer 300 is a double-sided aluminum-plastic composite tape, and the double-sided aluminum-plastic composite tape is coated on the outer wall of the water-blocking filling layer 600. Specifically, the double-sided aluminum-plastic composite tape is coated on the outer wall of the water-blocking filling layer 600 in the longitudinal direction, and the aluminum tape layer in the double-sided aluminum-plastic composite tape can prevent moisture from entering the interior of the photovoltaic cable in the radial direction. At the same time, when the plastic film layer of the double-sided aluminum-plastic composite tape is extruded into the outer sheath 400, the plastic film layer is subjected to the high temperature and high pressure brought by the extrusion process. At this time, the overlapping parts of the plastic film layer will adhere to each other to form a closed cylindrical shape to completely cover the internal cable core, thereby effectively preventing moisture from penetrating into the interior of the photovoltaic cable in the radial direction, and at the same time, it is tightly bonded to the outer sheath 400, thereby further greatly improving the waterproof performance of the photovoltaic cable.

[0038] It is understandable that in some embodiments of the present invention, the photovoltaic cable further includes a bearing member 700, which is disposed in the outer sheath 400. The bearing member 700 can enhance the pulling and impact resistance of the photovoltaic cable, reduce the impact force on the internal structure of the photovoltaic cable when the photovoltaic cable is impacted or undulating, thereby improving the service life of the photovoltaic cable. Specifically, the bearing member 700 can be made of galvanized steel wire rope, and the galvanized steel wire rope is arranged along the length direction of the photovoltaic cable, so that the bearing member 700 can play a bearing role on the entire photovoltaic cable in the length direction, further improving the pulling and impact resistance of the photovoltaic cable. Specifically, the bearing member 700 includes two, and the two bearing members 700 are distributed on both sides of the photovoltaic cable. In some embodiments, the conductor 100, the floating member 500 and the bearing member 700 are all distributed along the long axis direction of the ellipse, and are arranged in sequence from the center of the ellipse to the outside.

[0039] It is understandable that in some embodiments of the present invention, the outer sheath 400 is made of nitrile rubber, and the nitrile rubber is coated on the outside of the bearing member 700. Nitrile rubber has excellent oil resistance, high wear resistance, good heat resistance, and strong adhesion, which can ensure that the photovoltaic cable can be laid in water for a long time, which is conducive to improving the service life of the photovoltaic cable.

[0040] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A floating photovoltaic cable, characterized in that: include: A conductor, arranged inside the photovoltaic cable; An insulating layer, covering the outer wall of the conductor; A waterproof layer, disposed on the outer periphery of the insulating layer, for preventing moisture from entering the interior of the photovoltaic cable; An outer sheath, arranged on the outside of the photovoltaic cable; Wherein, the photovoltaic cable further comprises a floating member, wherein the floating member is located between the insulating layer and the waterproof layer, and the density of the floating member is less than the average density of the photovoltaic cable.

2. The water floating photovoltaic cable according to claim 1, characterized in that: The floating piece is a plastic piece made of foamed polyethylene material, and the cross section of the plastic piece is semicircular.

3. The floating photovoltaic cable according to claim 2, characterized in that: The photovoltaic cable is provided with two groups of the floating members, and the two groups of the floating members are respectively located on both sides of the photovoltaic cable.

4. The floating photovoltaic cable according to claim 3, characterized in that: The photovoltaic cable has an elliptical cross section, and the conductor is provided with multiple pieces, which are spaced apart along the long axis of the ellipse, and the two groups of floating pieces are located on both sides of the multiple pieces of conductor along the long axis of the ellipse.

5. The water floating photovoltaic cable according to claim 1, characterized in that: The photovoltaic cable further comprises a water-blocking filling layer, wherein the water-blocking filling layer is filled in the gap between the insulating layer and the waterproof layer, and the floating member is arranged in the water-blocking filling layer.

6. The floating photovoltaic cable according to claim 5, characterized in that: The water-blocking filling layer is composed of a plurality of strands of water-blocking filling ropes, which fill the gap between the insulating layer and the waterproof layer and are coated on the outside of the floating member.

7. The floating photovoltaic cable according to claim 5, characterized in that: The waterproof layer is a double-sided aluminum-plastic composite tape, and the double-sided aluminum-plastic composite tape is coated on the outer wall of the water-blocking filling layer.

8. The water floating photovoltaic cable according to any one of claims 1 to 7, characterized in that: The photovoltaic cable further comprises a bearing member, and the bearing member is arranged in the outer sheath.

9. The water floating photovoltaic cable according to claim 8, characterized in that: The outer protective layer is made of nitrile rubber, and the nitrile rubber is coated on the outer side of the bearing component.

10. The water floating photovoltaic cable according to claim 8, characterized in that: The bearing member is a galvanized steel wire rope, and the galvanized steel wire rope is arranged along the length direction of the photovoltaic cable.

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