Protective cable for water photovoltaic power generation

Abstract

The utility model discloses a protective cable for overwater photovoltaic power generation. The protective cable comprises a conductor, an insulating layer, a composite buffer strip layer, a metal layer, a waterproof layer and an outer sheath which are arranged from inside to outside. The conductor is formed by stranding a plurality of copper wires and a plurality of aramid fiber bundles; a heat-conducting filler is arranged in the insulating layer; the composite buffer strip layer is formed by wrapping a composite buffer strip; the inner side and the outer side of the metal layer protrude to form lines, the cross sections of the lines are trapezoidal, and the top edge widths of the lines on the inner side are w and wgt; the thickness of the 0.5 mm composite buffer zone layer is t, tgt; the thickness is 0.5 mm. According to the cable provided by the utility model, the bending resistance, the tensile resistance and the rat and ant bite prevention performance are improved.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, and in particular to a protective cable for underwater photovoltaic power generation. Background Technology

[0002] Due to limited land resources, many countries have been vigorously developing floating photovoltaic power generation projects in recent years. Floating photovoltaic power stations use floating platforms to float photovoltaic modules on the water surface to generate electricity. Their characteristics are that they do not occupy land resources, and the water has a cooling effect on the photovoltaic modules, thereby inhibiting the rise of the module surface temperature and obtaining higher power generation.

[0003] Cables are a crucial component of photovoltaic modules. Experience from floating photovoltaic projects shows that a significant portion of the cable's length is submerged in water for extended periods, sometimes permanently. Hydrological conditions in certain areas can change dramatically with the seasons, posing a risk of cable damage from bending or stretching caused by turbulent currents or waves. Furthermore, another portion of the cable needs to be buried underground to connect to surface equipment, thus requiring enhanced resistance to rodents and termites. Existing cables cannot simultaneously provide adequate bending and tensile strength as well as protection against rodents and termites. Utility Model Content

[0004] In order to address the shortcomings of existing optical cables used in photovoltaic power generation projects that cannot simultaneously achieve resistance to bending, tension, and rodent and ant bites, this utility model proposes a cable that improves these properties.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A protective cable for floating photovoltaic power generation includes, from the inside out, a conductor, an insulation layer, a composite buffer layer, a metal layer, a water-blocking layer, and an outer sheath; the conductor is made of multiple copper wires and multiple aramid filaments twisted together; the insulation layer contains thermally conductive filler; the composite buffer layer is formed by wrapping a composite buffer strip; the metal layer has raised ridges on both the inner and outer sides to form patterns, the cross-section of the patterns is trapezoidal, the width of the top edge of the inner pattern is w, w>0.5mm, and the thickness of the composite buffer layer is t, t>0.5mm.

[0007] Furthermore, firstly, the cross-section of the metal layer's texture is trapezoidal, which improves stress concentration and prevents the metal layer from damaging the insulation layer after the cable bends, thereby enhancing the cable's bending resistance; secondly, aramid fibers are doped into the conductor to improve the cable's tensile strength; and thirdly, textures are set inside and outside the metal layer to increase the cable's bending resistance.

[0008] Furthermore, an outer adhesive layer is provided between the metal layer and the composite buffer layer.

[0009] With the above settings, firstly, relative sliding between the metal layer and the composite buffer layer can be prevented; secondly, the outer adhesive layer can fill the gap between the inner side of the metal layer and the outer side of the composite buffer layer, further dispersing the stress on the inner side of the metal layer, thereby further preventing the metal layer from damaging the inner insulation layer.

[0010] Furthermore, the composite buffer strip includes a buffer strip body and a reinforcing layer disposed inside the buffer strip body. The buffer strip body is made of foamed polyethylene or silicone, and the reinforcing layer is made of polyester fiber, glass fiber, or aramid fiber.

[0011] The above settings achieve two objectives: first, to further enhance the tensile strength of the cable; and second, to increase the strength of the composite buffer strip, making it easier to wrap the composite buffer strip.

[0012] Furthermore, an inner adhesive layer and an expansion layer are provided between the composite buffer layer and the insulation layer, and the expansion layer is made of sodium polyacrylate or superabsorbent polymer.

[0013] The above settings further enhance the cable's waterproofness.

[0014] Furthermore, the water-blocking layer is made of water-blocking cable paste, with the inner wall of the water-blocking cable paste adhering to the outer wall of the metal layer.

[0015] Through the above settings, firstly, the waterproofness of the cable is further improved; secondly, the water-blocking cable paste can fill the gaps between the textures on the outside of the metal layer, thereby reducing the concentrated stress on the outside of the metal layer and preventing the metal layer from damaging the outer sheath.

[0016] Furthermore, the insulating layer is made of polyimide or liquid crystal polymer.

[0017] The above settings further improve the heat dissipation of the cable.

[0018] Furthermore, the thermally conductive filler is made of aluminum nitride, boron nitride, or aluminum oxide.

[0019] Furthermore, the inner and outer adhesive layers are made of hot melt adhesive or pressure-sensitive adhesive. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the cable used in an embodiment.

[0021] Figure 2 for Figure 1 Enlarged view of point A. Detailed Implementation

[0022] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0023] likeFigures 1 to 2 A protective cable for floating photovoltaic power generation includes, from the inside out, a conductor 2, an insulation layer 3, a composite buffer layer, a metal layer 5, a water-blocking layer 6, and an outer sheath 7; the conductor 2 is formed by stranding multiple copper wires 21 and multiple aramid fibers 22; the insulation layer 3 contains a thermally conductive filler 8; the composite buffer layer is formed by wrapping a composite buffer strip 4; the metal layer 5 has raised ridges 9 on its inner and outer sides, the cross-section of the ridges 9 is trapezoidal, the width of the top edge of the inner ridges 9 is w, w>0.5mm, and the thickness of the composite buffer layer is t, t>0.5mm.

[0024] As one implementation method, firstly, the cross-section of the texture 9 of the metal layer 5 is trapezoidal, which improves the phenomenon of stress concentration and prevents the metal layer 5 from crushing the insulation layer 3 after the cable is bent, thereby improving the bending resistance of the cable; secondly, aramid fibers 22 are doped into the conductor 2 to improve the tensile performance of the cable; thirdly, texture 9 is set inside and outside the metal layer 5 to increase the bending resistance of the cable.

[0025] The cable of this application is mainly used in the field of photovoltaic power generation. The cable needs to be laid underground and underwater. In water, the cable is easily bent and stretched, requiring good bending and tensile strength to prevent breakage. Underground, the cable needs strong resistance to rodent bites. During cable processing, copper wire 21 and aramid fiber 22 are bundled together to form conductor 2. Aramid fiber 22 significantly improves the tensile strength of the cable, preventing breakage. Furthermore, the fine aramid fiber 22 fills the gaps between the copper wires 21, increasing the overall density of conductor 2 and facilitating underwater laying. The copper wire 21 is specifically made of annealed soft round tin-plated copper monofilament, giving conductor 2 flexibility and ease of bending. An insulation layer 3 is extruded onto the conductor 2, serving an insulating function. Because aramid fiber 22 is incorporated into conductor 2, thermally conductive filler 8 is placed within the insulation layer 3 to facilitate heat conduction. Body 2 dissipates heat; the outer side of the insulation layer 3 is wrapped with a composite buffer strip 4 to form a composite buffer strip layer. The composite buffer strip 4 is made of elastic material to form a buffer and prevent the metal layer 5 from crushing the insulation layer 3; the metal layer 5 is made of steel strip with a nominal thickness of 0.15mm, which has good strength and plays an armoring role, preventing rodent bites. The inner and outer sides are pressed with textures 9. The cross-section of textures 9 is specifically an isosceles trapezoid. The top edge of the inner texture 9 is specifically the side of texture 9 closer to conductor 2, and the top edge of the outer texture 9 is specifically the side of texture 9 away from conductor 2. The top edge of the trapezoidal texture 9 is relatively wide, specifically 1mm, to reduce the concentrated stress on the inner and outer sides of the metal layer 5 and prevent the textures 9 of the metal layer 5 from crushing the insulation layer 3 when the cable is bent; after the water-blocking layer 6 is coated on the outside of the insulation layer 3, the outer sheath 7 is finally extruded on the outside of the water-blocking layer 6.

[0026] As one implementation method, an outer adhesive layer 10 is provided between the metal layer 5 and the composite buffer strip layer.

[0027] With the above settings, firstly, relative sliding between the metal layer 5 and the composite buffer strip layer can be prevented; secondly, the outer adhesive layer 10 can fill the gap between the inner side of the metal layer 5 and the outer side of the composite buffer strip layer, further dispersing the stress on the inner side of the metal layer 5, thereby further preventing the metal layer 5 from crushing the inner insulating layer 3.

[0028] As one implementation, the composite buffer strip 4 includes a buffer strip body 41 and a reinforcing layer 42 disposed inside the buffer strip body 41. The buffer strip body 41 is made of foamed polyethylene or silicone, and the reinforcing layer 42 is made of polyester fiber, glass fiber or aramid fiber.

[0029] The above settings achieve two objectives: first, to further enhance the tensile strength of the cable; and second, to increase the strength of the composite buffer strip 4, making it easier to wrap the composite buffer strip 4 around.

[0030] The buffer strip body 41 of this application is made of silicone, which is soft and elastic, can adapt to the deformation of the texture 9 of the metal layer 5, and is resistant to compression and fatigue; the reinforcing layer 42 is made of aramid fiber, which has a mesh structure, can improve the strength and tensile properties of the composite buffer strip 4, and has good flexibility, adapting to the bending and stretching of the cable.

[0031] As one implementation method, an inner adhesive layer 11 and an expansion layer 12 are provided between the composite buffer layer and the insulating layer 3, and the expansion layer 12 is made of sodium polyacrylate or superabsorbent polymer.

[0032] The above settings further enhance the cable's waterproofness.

[0033] The expansion layer 12 of this application is made of highly absorbent material. When water seeps in, it absorbs water and expands rapidly to form a gel-like barrier, which effectively prevents water from continuing to seep in. The inner adhesive layer 11 is disposed between the expansion layer 12 and the insulating layer 3, which plays a role in stabilizing the expansion layer 12.

[0034] As one implementation method, the water-blocking layer 6 is made of water-blocking cable paste, and the inner wall of the water-blocking cable paste is attached to the outer wall of the metal layer 5.

[0035] Through the above settings, firstly, the waterproofness of the cable is further improved; secondly, the water-blocking cable paste can fill the gaps between the textures 9 on the outside of the metal layer 5, thereby reducing the concentrated stress on the outside of the metal layer 5 and preventing the metal layer 5 from damaging the outer sheath 7.

[0036] As one implementation method, the insulating layer 3 is made of polyimide or liquid crystal polymer.

[0037] The above settings further improve the heat dissipation of the cable.

[0038] As one implementation method, the thermally conductive filler 8 is made of aluminum nitride, boron nitride, or aluminum oxide.

[0039] As one implementation method, the inner adhesive layer 11 and the outer adhesive layer 10 are made of hot melt adhesive or pressure-sensitive adhesive.

[0040] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A protective cable for photovoltaic power generation on water, characterized by, It includes, from the inside out, a conductor, an insulating layer, a composite buffer layer, a metal layer, a water-blocking layer, and an outer sheath; The conductor is made of multiple copper wires and multiple aramid fibers twisted together; The insulating layer is provided with thermally conductive filler; The composite buffer strip layer is formed by wrapping with a composite buffer strip; The metal layer has raised protrusions on both the inner and outer sides to form textures. The cross-section of the textures is trapezoidal, and the width of the top edge of the inner texture is w, where w > 0.5 mm. The thickness of the composite buffer layer is t, where t > 0.5 mm.

2. The protective cable for floating photovoltaic power generation according to claim 1, characterized in that, An outer adhesive layer is provided between the metal layer and the composite buffer strip layer.

3. The protective cable for floating photovoltaic power generation according to claim 1, characterized in that, The composite buffer strip includes a buffer strip body and a reinforcing layer disposed inside the buffer strip body. The buffer strip body is made of foamed polyethylene or silicone, and the reinforcing layer is made of polyester fiber, glass fiber or aramid fiber.

4. The protective cable for photovoltaic power generation on water according to claim 2, characterized in that, An inner adhesive layer and an expansion layer are disposed between the composite buffer layer and the insulating layer, and the expansion layer is made of sodium polyacrylate or superabsorbent polymer.

5. A protective cable for floating photovoltaic power generation according to claim 1, characterized in that, The water-blocking layer is made of water-blocking cable paste, and the inner wall of the water-blocking cable paste is attached to the outer wall of the metal layer.

6. A protective cable for floating photovoltaic power generation according to claim 1, characterized in that, The insulating layer is made of polyimide or liquid crystal polymer.

7. A protective cable for floating photovoltaic power generation according to claim 1, characterized in that, The thermally conductive filler is made of aluminum nitride, boron nitride, or aluminum oxide.

8. The protective cable for photovoltaic power generation on water according to claim 4, characterized in that, The inner and outer adhesive layers are made of hot melt adhesive or pressure-sensitive adhesive.

Images