Protective flame retardant photovoltaic cable

Abstract

The utility model discloses a kind of protective flame-retardant photovoltaic cables, including cable body, the cable body includes cable core and sheath protection layer, the cable core is arranged in the inside of sheath protection layer, the cable core includes wire core and functional layer, the wire core is provided with multiple and arranged in the inside of functional layer, the functional layer includes insulating shield, first flame-retardant layer, metal armor layer and second flame-retardant layer, the insulating shield, first flame-retardant layer, metal armor layer and second flame-retardant layer are sequentially arranged from inside to outside, the first flame-retardant layer is ceramic silicon rubber flame-retardant layer, the second flame-retardant layer is aluminum hydroxide and magnesium hydroxide composite flame-retardant layer. Its realized photovoltaic cable flame-retardant capacity, increased practicability, thereby solved the problem that traditional photovoltaic cable mostly does not have perfect flame-retardant structure, leading to its flame-retardant performance is insufficient, combustible under high temperature or fire condition, affect the stable use of photovoltaic cable.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, specifically a protective flame-retardant photovoltaic cable. Background Technology

[0002] Photovoltaic cables are special cables designed for solar photovoltaic power generation systems. They are used to connect photovoltaic modules, inverters, combiner boxes and other equipment to achieve safe and efficient transmission of DC power. Their core function is to adapt to the complex environment of photovoltaic power plants and ensure the long-term stable operation of the system. For example, the authorized patent with announcement number CN221304289U (a photovoltaic cable) includes: a conductor, including a reinforcing core and a conductive layer, wherein the conductive layer is disposed radially around the outer periphery of the reinforcing core of the photovoltaic cable; and a structural layer, disposed radially around the outer periphery of the conductive layer of the photovoltaic cable. While the aforementioned existing technologies increase the overall structural strength and stability of photovoltaic cables by reinforcing the core, thereby improving the load-bearing capacity and safety of photovoltaic cables, they lack a flame-retardant layer structure. Consequently, most traditional photovoltaic cables do not possess a complete flame-retardant structure, resulting in insufficient flame-retardant performance. They are prone to combustion under high temperatures or fire conditions, affecting the stable use of photovoltaic cables. Therefore, the market urgently needs to develop a protective flame-retardant photovoltaic cable to help people solve the existing problems. Utility Model Content

[0003] The purpose of this invention is to provide a protective flame-retardant photovoltaic cable to solve the problem mentioned in the background art that most traditional photovoltaic cables do not have a perfect flame-retardant structure, resulting in insufficient flame-retardant performance and easy combustion under high temperature or fire conditions, which affects the stable use of photovoltaic cables.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a protective flame-retardant photovoltaic cable, comprising a cable body, the cable body comprising a cable core and a sheath protective layer, the cable core being disposed inside the sheath protective layer, the cable core comprising a conductor core and a functional layer, the conductor core being disposed in multiple portions and disposed inside the functional layer, the functional layer comprising an insulating shielding layer, a first flame-retardant layer, a metal armor layer and a second flame-retardant layer, the insulating shielding layer, the first flame-retardant layer, the metal armor layer and the second flame-retardant layer being arranged sequentially from the inside out, the first flame-retardant layer being a ceramicized silicone rubber flame-retardant layer, and the second flame-retardant layer being a composite flame-retardant layer of aluminum hydroxide and magnesium hydroxide.

[0005] Preferably, the protective sheath layer includes an outer sheath layer and a protective layer. The outer sheath layer is disposed outside the protective layer. The outer sheath layer is made of polyvinyl chloride material with added UV stabilizers and flame retardants. The protective layer is made of highly elastic rubber material.

[0006] Preferably, the outer sheath layer is coated with an intumescent flame-retardant coating containing UV stabilizers.

[0007] Preferably, the wire core includes a conductor, a semi-conductive shielding layer, and an inner insulating layer, which are arranged sequentially from the inside to the outside.

[0008] Preferably, a color-coded strip is provided on the outer side of the inner insulation layer of the wire core.

[0009] Preferably, cotton or linen rope is used to fill the space between the core wire and the functional layer.

[0010] Preferably, the insulating shielding layer is made of semi-conductive rubber material, and the metal armor layer is set as galvanized steel strip.

[0011] Compared with the prior art, the beneficial effects of this utility model are: (1) This utility model sets up a first flame-retardant layer and a second flame-retardant layer arranged from the inside to the outside. The first flame-retardant layer is a ceramicized silicone rubber flame-retardant layer, which can undergo a ceramicization reaction in a high-temperature environment to form a dense ceramic-like protective layer, effectively isolating oxygen and high temperature and preventing the spread of flame. The second flame-retardant layer is a composite flame-retardant layer of aluminum hydroxide and magnesium hydroxide, which decomposes and absorbs heat and releases crystal water when heated, diluting combustible gas and reducing the intensity of combustion. The two flame-retardant structures work together to build a double flame-retardant defense for the cable, greatly improving the flame-retardant performance of the cable, so that it can still maintain good stability under extreme conditions such as high temperature or fire, reducing damage and safety hazards caused by combustion, ensuring the stable use of photovoltaic cables, extending the service life of cables, and improving the overall reliability and safety of photovoltaic systems.

[0012] (2) The utility model further enhances the cable’s protection capability through the double-layer structure of the sheath protection layer, which includes an outer sheath layer and a protective layer. The outer sheath layer is made of polyvinyl chloride material with added UV stabilizers and flame retardants, which can effectively resist long-term exposure to sunlight, prevent the cable outer sheath from aging and cracking, and improve the flame retardant performance of the outer sheath, providing additional protection for the cable. The protective layer is made of highly elastic rubber material, which can undergo elastic deformation, absorb and disperse external forces, reduce the impact of external forces on the internal structure of the cable, and improve the cable’s resistance to mechanical damage.

[0013] (3) By setting a distinguishing color strip on the outside of the internal insulation layer of the wire core, the present invention can facilitate maintenance personnel to quickly locate the faulty wire core, reduce troubleshooting time, reduce maintenance costs, and increase practicality. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a protective flame-retardant photovoltaic cable according to the present invention; Figure 2This is a side sectional view of the cable body of this utility model; Figure 3 This is a schematic diagram of the internal structure of the protective layer of the sheath of this utility model; Figure 4 This is a schematic diagram of the internal structure of the wire core of this utility model.

[0015] In the diagram: 1. Cable body; 2. Core; 201. Conductor; 202. Semi-conductive shielding layer; 203. Inner insulation layer; 3. Sheath protection layer; 301. Outer sheath layer; 302. Protective layer; 4. Functional layer; 401. Insulation shielding layer; 402. First flame retardant layer; 403. Metal armor layer; 404. Second flame retardant layer. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0017] Please see Figure 1-4 The present invention provides an embodiment of a protective flame-retardant photovoltaic cable, comprising a cable body 1, the cable body 1 comprising a cable core and a sheath protective layer 3, the cable core being disposed inside the sheath protective layer 3, the cable core comprising a conductor 2 and a functional layer 4, the conductor 2 being disposed in multiples and disposed inside the functional layer 4, the functional layer 4 comprising an insulating shielding layer 401, a first flame-retardant layer 402, a metal armor layer 403 and a second flame-retardant layer 404, the insulating shielding layer 401, the first flame-retardant layer 402, the metal armor layer 403 and the second flame-retardant layer 404 being arranged sequentially from the inside out, the first flame-retardant layer 402 being a ceramicized silicone rubber flame-retardant layer, and the second flame-retardant layer 404 being a composite flame-retardant layer of aluminum hydroxide and magnesium hydroxide.

[0018] The first flame-retardant layer 402 is made of ceramicized silicone rubber material, which can be ceramicized to form a dense heat-insulating layer under high temperature environment, effectively isolating oxygen and high temperature. The second flame-retardant layer 404 uses aluminum hydroxide and magnesium hydroxide composite flame retardant, which inhibits the combustion reaction through the dual effects of heat absorption decomposition and release of crystal water. Through the synergistic effect of the double-layer flame-retardant design, the cable forms multiple protective barriers in the event of a fire. The inner ceramicized layer blocks high temperature, and the outer composite flame retardant decomposes, absorbs heat, and dilutes flammable gases, improving the overall flame-retardant performance of the cable. At the same time, the metal armor layer 403 enhances the mechanical protection performance of the cable, improving the safety and reliability of the cable in complex environments.

[0019] Please see Figure 3The protective sheath 3 includes an outer sheath 301 and a protective layer 302. The outer sheath 301 is disposed on the outside of the protective layer 302. The outer sheath 301 is made of polyvinyl chloride material with added UV stabilizers and flame retardants. The protective layer 302 is made of highly elastic rubber material.

[0020] The addition of UV stabilizers to the outer sheath layer 301 effectively resists long-term sunlight exposure, prevents aging and cracking of the cable outer sheath, and extends the service life of the cable in outdoor environments. The addition of flame retardants improves the flame retardant performance of the outer sheath, providing additional protection for the cable. The protective layer 302 is made of highly elastic rubber material. When the cable is subjected to external impact, the highly elastic rubber material can undergo elastic deformation, absorb and disperse the external force, reduce the impact of the external force on the internal structure of the cable, protect the insulation layer and conductor of the cable from damage, improve the cable's resistance to mechanical damage, and increase its practicality.

[0021] Please see Figure 3 The outer sheath layer 301 is coated with an intumescent flame-retardant coating containing UV stabilizers.

[0022] The intumescent flame-retardant coating expands rapidly when exposed to fire, forming a dense char layer. This char layer provides excellent oxygen barrier properties, effectively preventing the spread of flames and offering additional flame-retardant protection for the cable. Simultaneously, the UV stabilizers added to the coating work synergistically with those in the outer sheath material, further enhancing the cable's resistance to ultraviolet radiation. This prevents the outer sheath from aging and becoming brittle due to UV exposure, extending the cable's lifespan, reducing maintenance costs, and ensuring the long-term stable operation of the photovoltaic system.

[0023] Please see Figure 4 The core 2 includes a conductor 201, a semi-conductive shielding layer 202, and an inner insulation layer 203, which are arranged sequentially from the inside to the outside.

[0024] The semiconductive shielding layer 202 is wrapped around the conductor 201, which can effectively and uniformly distribute the electric field on the surface of the conductor 201, prevent local electric field concentration, avoid discharge phenomena caused by electric field distortion, and improve the electrical safety performance of the cable. The internal insulation layer is made of insulating material, which has good electrical insulation performance, can effectively prevent current leakage, and ensure the safe operation of the cable.

[0025] Please see Figure 1 The inner insulation layer 203 of the wire core 2 has a distinguishing color strip on the outside.

[0026] During the installation of photovoltaic cables, color-coded strips can help construction workers quickly and accurately identify different wire cores, avoid wiring errors, and improve installation efficiency. During cable maintenance and repair, color-coded strips can help maintenance personnel quickly locate faulty wire cores, reduce troubleshooting time, and lower maintenance costs.

[0027] Please see Figure 2 Cotton and linen rope is filled between the core 2 and the functional layer 4.

[0028] Cotton and linen ropes have good flexibility and elasticity, which can fill the gap between the core 2 and the functional layer 4, making the internal structure of the cable more compact and improving the overall stability of the cable.

[0029] Please see Figure 2 The insulating shielding layer 401 is made of semi-conductive rubber material, and the metal armor layer 403 is set as galvanized steel strip.

[0030] The insulating shielding layer 401, made of semi-conductive rubber material, can distribute the electric field evenly and improve the electrical safety performance of the cable. The metal armor layer 403, made of galvanized steel strip, has high mechanical strength and can effectively enhance the cable's resistance to compression and impact, protect the internal structure of the cable from external damage, and improve the reliability of the cable.

[0031] Working principle: During use, when the cable encounters high temperature or open flame, the ceramicized silicone rubber material of the first flame-retardant layer 402 rapidly ceramicizes to form a dense temperature barrier, effectively isolating oxygen and preventing heat transfer inward. Simultaneously, the composite flame retardant of the second flame-retardant layer 404 inhibits the combustion reaction through the dual effects of heat absorption decomposition and release of flame-retardant gases. The metal armor layer 403 provides mechanical protection, and the intumescent flame-retardant coating of the outer sheath expands upon contact with fire, forming an additional fireproof layer. During photovoltaic cable operation, the semi-conductive shielding layer 202 provides a uniform electric field distribution, and the internal insulation layer 203 ensures reliable insulation. In daily protection, the outer sheath layer 301 uses added anti-flame... The PVC material contains UV stabilizers and flame retardants. The UV stabilizers resist long-term exposure to sunlight and prevent the outer sheath from aging and cracking. The intumescent flame-retardant coating with added UV stabilizers applied to the surface of the outer sheath layer 301 works synergistically with the UV stabilizers in the outer sheath layer 301 material to further enhance resistance to ultraviolet rays and extend the cable's service life. In addition, the color-coded strips on the outside of the inner insulation layer 203 of the conductor 2 help construction personnel quickly and accurately identify different conductors during installation, avoiding wiring errors, improving installation efficiency, and facilitating maintenance personnel to quickly locate faulty conductors during maintenance and repair, reducing troubleshooting time and increasing practicality.

[0032] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A protective flame-retardant photovoltaic cable, comprising a cable body (1), characterized in that: The cable body (1) includes a cable core and a sheath protective layer (3). The cable core is disposed inside the sheath protective layer (3). The cable core includes a wire core (2) and a functional layer (4). Multiple wire cores (2) are disposed inside the functional layer (4). The functional layer (4) includes an insulation shielding layer (401), a first flame retardant layer (402), a metal armor layer (403), and a second flame retardant layer (404). The insulation shielding layer (401), the first flame retardant layer (402), the metal armor layer (403), and the second flame retardant layer (404) are arranged sequentially from the inside to the outside. The first flame retardant layer (402) is a ceramicized silicone rubber flame retardant layer, and the second flame retardant layer (404) is a composite flame retardant layer of aluminum hydroxide and magnesium hydroxide.

2. The protective flame-retardant photovoltaic cable according to claim 1, characterized in that: The protective sheath (3) includes an outer sheath (301) and a protective layer (302). The outer sheath (301) is disposed on the outside of the protective layer (302). The outer sheath (301) is made of polyvinyl chloride material with added UV stabilizer and flame retardant. The protective layer (302) is made of high elastic rubber material.

3. The protective flame-retardant photovoltaic cable according to claim 2, characterized in that: The outer sheath layer (301) is coated with an intumescent flame-retardant coating containing UV stabilizers.

4. The protective flame-retardant photovoltaic cable according to claim 1, characterized in that: The core (2) includes a conductor (201), a semi-conductive shielding layer (202) and an inner insulation layer (203), which are arranged sequentially from the inside to the outside.

5. A protective flame-retardant photovoltaic cable according to claim 4, characterized in that: The inner insulation layer (203) of the core (2) is provided with a distinguishing color strip on the outside.

6. A flame retardant photovoltaic cable with protection according to claim 1, characterized in that: The space between the core (2) and the functional layer (4) is filled with cotton and linen rope.

7. A protective flame-retardant photovoltaic cable according to claim 1, characterized in that: The insulating shielding layer (401) is made of semi-conductive rubber material, and the metal armor layer (403) is set as galvanized steel strip.

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