Photovoltaic cable

Abstract

The utility model discloses a photovoltaic cable. The photovoltaic cable comprises a cable body, the cable comprises a composite cable core, a waterproof layer and a protective structure layer. The protective structure layer comprises a protective layer from inside to outside; an isolation layer, a metal layer and a protection layer; the isolating layer is made of hydrogenated butadiene-acrylonitrile rubber; the metal layer comprises a metal sheath layer and a metal coating; the protective layer comprises a protective fiber layer and a protective outer layer, and the protective fiber layer is made of para-aramid fibers; the protective structure layer is sleeved on the waterproof layer, and the waterproof layer wraps the composite cable core. Hydrogenated butadiene-acrylonitrile rubber is used as a material of the isolating layer, good heat resistance and corrosion resistance are achieved, the metal layer reinforces external damage prevention of the photovoltaic cable, and para-aramid fibers are used as a material of the protective fiber layer in the protective layer. Para-aramid has excellent performances of high strength, high temperature resistance, acid and alkali resistance, light weight and the like, and can ensure that core elements of the photovoltaic cable are not damaged in construction and operation processes. And the use safety and the service life of the photovoltaic cable are improved.

Description

Technical Field

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

[0002] As an indispensable component of solar photovoltaic power generation systems, photovoltaic cables are becoming increasingly important. With the rapid development of photovoltaic technology and the continuous expansion of its application fields, the uses of photovoltaic cables are also becoming more and more diversified.

[0003] Chinese utility model patent CN217933258U discloses a waterproof photovoltaic cable, including wire cores, multiple wire cores wrapped with a waterproof layer, each wire core wrapped with an insulation layer, and waterproof powder filling the space between the waterproof layer and the wire cores. The waterproof layer is wrapped with a sheath layer. The waterproof layer includes a puncture-resistant layer and a waterproof roll layer. The puncture-resistant layer is made of puncture-resistant silicone cloth and is disposed between the waterproof roll layer and the sheath layer.

[0004] The applicant found through research that existing photovoltaic cables lack the ability to prevent damage. They are prone to breakage during operation, transportation, laying, and pulling, which affects their use and can easily cause safety accidents. Utility Model Content

[0005] To overcome the above-mentioned technical defects, this utility model provides a photovoltaic cable.

[0006] To solve the above problems, this utility model is implemented according to the following technical solution:

[0007] The photovoltaic cable of this utility model includes: a composite cable core, a waterproof layer, and a protective structural layer;

[0008] The protective structure layer, from the inside out, includes: an isolation layer, a metal layer, and a protective layer;

[0009] The insulating layer is made of hydrogenated nitrile rubber;

[0010] The metal layer includes a metal sheath layer and a metal coating layer;

[0011] The protective layer includes a protective fiber layer and a protective outer layer, wherein the protective fiber layer is made of para-aramid fiber;

[0012] The protective structural layer is fitted over the waterproof layer, and the waterproof layer encloses the composite cable core.

[0013] Preferably, the composite cable core includes a plurality of conductors and a filler layer;

[0014] The conductor is disposed in the filler layer;

[0015] The conductor is made of several strands of copper wire, and an insulating layer is covered on the conductor. The filling layer is disposed between the insulating layer and the insulating layer.

[0016] Preferably, the insulating layer is cross-linked polyvinyl chloride, and the filling layer is made of glass fiber.

[0017] Preferably, the waterproof layer includes a seepage-proof membrane and a water-blocking layer;

[0018] The water-blocking layer is wrapped around the impermeable membrane.

[0019] Preferably, the geomembrane is made of polyethylene terephthalate.

[0020] Preferably, the water-blocking layer is made by winding and rolling water-blocking yarn.

[0021] Preferably, the metal sheath layer is made by continuous extrusion of aluminum rods.

[0022] Preferably, the metal coating is a fluorocarbon paint sprayed onto the metal sheath layer.

[0023] Preferably, the protective outer layer is a halogen-free, low-smoke, flame-retardant polyolefin sheath material extruded onto the protective fiber layer.

[0024] Compared with the prior art, the beneficial effects of this utility model are:

[0025] This utility model provides a photovoltaic cable, comprising: a composite cable core, a waterproof layer, and a protective structural layer; the protective structural layer includes, from the inside out: an isolation layer, a metal layer, and a protective layer; the isolation layer is made of hydrogenated nitrile rubber; the metal layer includes a metal sheath layer and a metal coating; the protective layer includes a protective fiber layer and a protective outer layer, the protective fiber layer being made of para-aramid fiber; the protective structural layer is fitted over the waterproof layer, and the waterproof layer encloses the composite cable core.

[0026] Hydrogenated nitrile rubber is used as the insulating layer material, which has good heat resistance and corrosion resistance. The metal layer strengthens the photovoltaic cable to protect it from external damage. Para-aramid fiber is used as the protective fiber layer material in the protective layer. Para-aramid has excellent properties such as high strength, high temperature resistance, acid and alkali resistance, and light weight, which ensures that the core components of the photovoltaic cable are not damaged during construction and operation. This improves the safety and service life of the photovoltaic cable. Attached Figure Description

[0027] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0028] Figure 1 This is a cross-sectional schematic diagram of a photovoltaic cable according to this utility model;

[0029] Figure 2 This is a schematic cross-sectional view of the composite cable core and waterproof layer structure of a photovoltaic cable according to this utility model;

[0030] Figure 3 This is a schematic cross-sectional view of the protective structure layer of a photovoltaic cable according to this utility model;

[0031] In the picture:

[0032] 1-Composite cable core, 101-Conductor, 102-Filling layer, 103-Insulation layer;

[0033] 2-Waterproof layer, 201-Obscuration membrane, 202-Water-blocking layer;

[0034] 3-Protective structural layer, 301-Isolation layer, 302-Metal sheath layer, 303-Metal coating, 304-Protective fiber layer, 305-Protective outer layer, 306-Metal layer, 307-Protective layer. Detailed Implementation

[0035] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0036] like Figures 1-3 This is a cross-sectional schematic diagram of the photovoltaic cable described in this utility model. The photovoltaic cable of this utility model includes: a composite cable core 1, a waterproof layer 2, and a protective structure layer 3; the protective structure layer 3 includes, from the inside out: an isolation layer 301, a metal layer 306, and a protective layer 307; the isolation layer 301 is made of hydrogenated nitrile rubber; the metal layer 306 includes a metal sheath layer 302 and a metal coating layer 303; the protective layer 307 includes a protective fiber layer 304 and a protective outer layer 305, the protective fiber layer 304 is made of para-aramid fiber; the protective structure layer 3 is fitted over the waterproof layer 2, and the waterproof layer 2 wraps around the composite cable core 1.

[0037] Understandably, the insulating layer 301 in the protective structural layer 3 is made of hydrogenated nitrile butadiene rubber. In this embodiment, the highly saturated structure of the hydrogenated nitrile butadiene rubber gives it good heat resistance, excellent chemical corrosion resistance, excellent ozone resistance, and high resistance to compression set. Simultaneously, the hydrogenated nitrile butadiene rubber also possesses high strength, high tear resistance, and excellent abrasion resistance. In this application, the photovoltaic cable uses hydrogenated nitrile butadiene rubber as the material for the insulating layer 301, which has good heat resistance and corrosion resistance, improving the safety and service life of the photovoltaic cable.

[0038] Optional, such as Figure 3As shown, the protective fiber layer 304 is made of para-aramid fiber, a synthetic fiber with excellent properties such as high strength, high temperature resistance, acid and alkali resistance, and light weight. It is understood that this application uses para-aramid fiber as the material of the protective fiber layer 304 in the protective layer 307. The excellent properties of para-aramid, such as high strength, high temperature resistance, acid and alkali resistance, and light weight, ensure that the core components of the photovoltaic cable are not damaged during construction and operation.

[0039] Optional, such as Figure 3 As shown, the protective outer layer 305 is a halogen-free, low-smoke, flame-retardant polyolefin sheath material extruded onto the protective fiber layer 304. It is understood that in one embodiment, the protective outer layer 305 is a halogen-free, low-smoke, flame-retardant polyolefin sheath material extruded onto the protective fiber layer 304. It is understood that the halogen-free, low-smoke, flame-retardant polyolefin sheath material is made from polyolefin as a base material, containing special halogen-free flame retardants and smoke suppressants, and is precisely mixed and processed through a special formula. It has excellent flame retardancy, and releases no halogen acid gas during combustion, with extremely low release of toxic and corrosive gases, resulting in extremely low smoke concentration. This invention uses a halogen-free, low-smoke, flame-retardant polyolefin sheath material extruded onto the protective fiber layer 304 as the protective outer layer 305, which provides good flame retardancy and enhanced safety.

[0040] Optional, such as Figure 3 As shown, the metal layer 306 includes a metal sheath layer 302 and a metal coating layer 303; the metal sheath layer 302 is made of aluminum alloy.

[0041] Understandably, the metal sheath layer 302 is made of aluminum alloy, and the water-blocking sheath layer 3 is encased by aluminum alloy argon arc welding. This application uses aluminum alloy as the material for the photovoltaic cable's metal sheath layer 302 because aluminum alloy can protect the photovoltaic cable while also isolating it from external contact and preventing mechanical damage, thus improving the service life of the high-voltage cable. Furthermore, the metal sheath layer 302 is also effectively fireproof. When the photovoltaic cable experiences a short circuit or other abnormal situation, the fireproofing effect of the metal sheath layer 302 can slow the spread of fire and reduce fire damage.

[0042] Optionally, in one embodiment, the metal coating 303 is a fluorocarbon paint sprayed onto the metal sheath layer 302. It is understood that fluorocarbon paint refers to a coating with fluororesin as the main film-forming substance. Fluororesin coatings, due to the high electronegativity of the introduced fluorine element and the strong carbon-fluorine bond energy, possess particularly superior properties. Its excellent corrosion resistance is attributed to its excellent chemical inertness; the paint film is resistant to acids, alkalis, salts, and various chemical solvents, providing a protective barrier for the substrate. The paint film is tough, with high surface hardness, impact resistance, flexural strength, and good wear resistance, exhibiting excellent physical and mechanical properties. The fluorocarbon coating has extremely low surface energy; surface dust can be self-cleaned by rainwater. Its excellent hydrophobicity—with a maximum water absorption rate of less than 5% and oil repellency—and extremely low coefficient of friction prevent dust and scale buildup, providing good anti-fouling properties. This invention uses fluorocarbon paint as a metal coating 303, which is sprayed onto the metal sheath layer 302. The strong adhesion of fluorocarbon paint gives it excellent adhesion to the aluminum alloy surface, which strengthens the protection of the photovoltaic cable and extends its service life.

[0043] Optional, such as Figure 2 As shown, the composite cable core 1 includes a plurality of conductors 101 and a filling layer 102; the conductors 1 are disposed in the filling layer 102;

[0044] The conductor 101 is made of several stranded copper wires, and an insulating layer 103 covers the conductor 101. The filling layer 102 is disposed between the isolation layer 301 and the insulating layer 103.

[0045] Understandably, in one embodiment, conductor 101 is made of three strands of copper wire. Using stranded copper wire in the conductor can reduce the operating temperature. Compared with a single strand of copper wire of the same cross-sectional area, stranded copper wire has higher mechanical properties and flexibility.

[0046] Optionally, the insulating layer 103 is made of cross-linked polyvinyl chloride (PVC), and the filling layer 102 is made of glass fiber filler. In one embodiment, the insulating layer 103 uses cross-linked PVC, which has good insulating properties.

[0047] In one embodiment, the filler layer 102 is made of glass fiber. It is understood that glass fiber is a high-performance inorganic non-metallic material with good insulation, strong heat resistance, good corrosion resistance, and high mechanical strength, which plays a role in protecting the conductor 101 and the insulating layer 103.

[0048] Optional, such as Figure 2 As shown, the waterproof layer 2 includes a geomembrane 201 and a water-blocking layer 202, with the water-blocking layer 202 wrapped around the geomembrane 201.

[0049] In one embodiment, the geomembrane 201 is made of ethylene propylene rubber. It is understood that ethylene propylene rubber, due to its main chain being composed of chemically stable saturated hydrocarbons, exhibits excellent aging resistance, including ozone resistance, heat resistance, and weather resistance. It also possesses good chemical resistance, electrical insulation properties, impact elasticity, low-temperature performance, low density, high filler capacity, and resistance to hot water and water vapor. Ethylene propylene rubber is synthesized primarily from ethylene and propylene. This invention uses ethylene propylene rubber as the geomembrane 201 in the waterproof layer 2 to prevent moisture from penetrating the photovoltaic cable, thus extending the service life of the photovoltaic cable.

[0050] In one embodiment, the water-blocking layer 202 is made of water-blocking yarn wound and rolled up. It is understood that the water-blocking yarn wound and rolled up water-permeable layer 201 provides double-layer waterproof protection, making the cable safer to use.

[0051] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A photovoltaic cable, characterized in that, include: Composite cable core (1), waterproof layer (2), protective structural layer (3); The protective structure layer (3) includes, from the inside out: an isolation layer (301), a metal layer (306), and a protective layer (307); The isolation layer (301) is made of hydrogenated nitrile rubber; The metal layer (306) includes a metal sheath layer (302) and a metal coating layer (303); The protective layer (307) includes a protective fiber layer (304) and a protective outer layer (305), wherein the protective fiber layer (304) is made of para-aramid fiber; The protective structure layer (3) is fitted over the waterproof layer (2), and the waterproof layer (2) wraps around the composite cable core (1).

2. The photovoltaic cable according to claim 1, characterized in that, The composite cable core (1) includes a plurality of conductors (101) and a filling layer (102); The conductor (101) is disposed in the filler layer (102); The conductor (101) is made of several strands of copper wire, and an insulating layer (103) covers the conductor (101). The filling layer (102) is disposed between the isolation layer (301) and the insulating layer (103).

3. A photovoltaic cable according to claim 2, characterized in that, The insulating layer (103) is cross-linked polyvinyl chloride, and the filling layer (102) is made of glass fiber.

4. The photovoltaic cable according to claim 1, characterized in that, The waterproof layer (2) includes a waterproof membrane (201) and a water-blocking layer (202); The water-blocking layer (202) is wrapped around the impermeable membrane (201).

5. A photovoltaic cable according to claim 4, characterized in that, The geomembrane (201) is made of ethylene propylene rubber.

6. A photovoltaic cable according to claim 4, characterized in that, The water-blocking layer (202) is made by winding and rolling water-blocking yarn.

7. A photovoltaic cable according to claim 1, characterized in that, The metal sheath layer (302) is made of aluminum alloy.

8. A photovoltaic cable according to claim 1, characterized in that, The metal coating (303) is a fluorocarbon paint sprayed onto the metal sheath layer (302).

9. A photovoltaic cable according to claim 1, characterized in that, The protective outer layer (305) is a halogen-free, low-smoke, flame-retardant polyolefin sheath material extruded onto the protective fiber layer (304).

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