Highly fireproof solar photovoltaic cable

Abstract

The utility model discloses a highly fireproof solar photovoltaic cable, which comprises a cable body uniformly provided with reinforcing members, the cable body comprises a cable shell externally provided with a fireproof sheath, the inner wall of the cable shell is fixedly provided with dividing strips uniformly arranged along the radial direction, an inner core is arranged between the adjacent dividing strips in an abutting manner, each dividing strip comprises an insulating layer, and the insulating layer is provided with an insulating layer. The two sides of the insulating layer are covered with fireproof layers, the inner core comprises a conductor, and a flame-retardant layer is arranged outside the conductor. Compared with the prior art, the fireproof cable has the advantages and beneficial effects that through the arrangement of the separation strips, when one of the inner cores is on fire, the fireproof layer can be utilized to prevent fire from spreading to other areas, so that the development of the fire is inhibited, the on-fire range of the cable is effectively limited, and the fireproof performance is greatly improved; and the flame-retardant layer can be used for reducing the spreading of fire, so that the loss is reduced, and the personal injury is reduced.

Description

Technical Field

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

[0002] Photovoltaic cables of solar energy systems are often used in harsh environmental conditions, such as high temperature, ultraviolet radiation, acid and alkali resistance and other complex environments. The on-site temperature of the solar energy system can reach 100°C on sunny days, and rubber cables and PVC cables with a rated temperature of 70 or 90°C are also mostly used outdoors. This will obviously affect the service life of the photovoltaic system. If low-grade materials are used for cables under this kind of environmental stress, the cable sheath will be fragile and even the cable insulation layer will be decomposed under long-term exposure. The above situations will directly increase the loss of the cable, and will also increase the risk of cable short circuits. In the medium and long term, the possibility of fire or personal injury is also higher. To this end, we propose a highly fire-resistant solar photovoltaic cable. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a highly fire-resistant solar photovoltaic cable.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A highly fire-resistant solar photovoltaic cable is designed, comprising a cable body evenly provided with reinforcements, the cable body comprising a cable outer shell with a fire-resistant sheath on the outside, the inner wall of the cable outer shell is fixed with radially evenly arranged dividing strips, an inner core is abutted between adjacent dividing strips, the dividing strips comprise an insulating layer, both sides of the insulating layer are covered with a fire-resistant layer, the inner core comprises a conductor, the conductor is provided with a flame-retardant layer on the outside, and the cable outer shell is also filled with a moisture-proof layer.

[0006] In the above solution, the reinforcing member comprises an annular sleeve sleeved on the fireproof sheath, the annular sleeve is provided with a wear-resistant bag, and the wear-resistant bag is filled with a non-Newtonian fluid.

[0007] In the above solution, the conductor jacket is provided with an insulating shell, the insulating shell is a hollow insulating shell, and the flame retardant layer is filled in the inner cavity of the insulating shell.

[0008] In the above solution, the inner cavity of the insulating shell is also provided with heat dissipation pipes evenly arranged along the circumference of the conductor.

[0009] In the above solution, the conductor is configured as a quasi-soft high-alloy conductor and is a tin-plated alloy conductor.

[0010] In the above scheme, the fireproof sheath is a Class B high fireproof cross-linked polyolefin.

[0011] In the above solution, the insulating shell is a highly cross-linked and high insulation resistance cross-linked polyolefin.

[0012] The advantages and beneficial effects of the utility model are as follows: by arranging a partition strip in the cable casing, the inner cavity of the cable casing is divided into different areas by using the partition strip, and the inner cores are placed in different areas respectively to isolate the inner cores from each other. Compared with the prior art, when one of the inner cores catches fire, the fireproof layer can be used to prevent the fire from spreading to other areas, thereby suppressing the development of the fire, effectively limiting the scope of the cable fire, and greatly improving the fireproof performance; by arranging a conductor, an insulating casing and a flame retardant layer, the conductor is wrapped by using a hollow insulating casing to achieve the purpose of insulation; at the same time, when the conductor reaches a high temperature and then catches fire, the flame retardant layer can be used to reduce the spread of the fire by slowing down the burning speed of the material, reducing the temperature of the surface of the material, and preventing oxygen from contacting the material, thereby reducing losses and reducing personal injuries, thereby improving safety in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0014] Figure 1 This is a structural schematic diagram of a highly fire-resistant solar photovoltaic cable proposed by the utility model;

[0015] Figure 2 This is a structural schematic diagram of a reinforcement member of a highly fire-resistant solar photovoltaic cable proposed by the utility model;

[0016] Figure 3 The utility model provides a cross-sectional view of a cable body of a highly fire-resistant solar photovoltaic cable.

[0017] In the figure: cable body 1, reinforcement 2, ring sleeve 21, wear-resistant bag 22, non-Newtonian fluid 23, cable casing 3, separator 4, fireproof layer 41, insulating layer 42, conductor 5, moisture-proof layer 6, insulating casing 7, flame retardant layer 8, fireproof sheath 9, heat dissipation pipe 10. DETAILED DESCRIPTION

[0018] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0019] See also Figure 1-3 , the utility model provides a technical solution: a highly fireproof solar photovoltaic cable, comprising a cable body 1 uniformly provided with reinforcement members 2;

[0020] Furthermore, the reinforcement 2 includes a ring sleeve 21 which is sleeved on the fireproof sheath 9, and a wear-resistant bag 22 is provided on the ring sleeve 21. The wear-resistant bag 22 is made of rubber to increase the friction between the reinforcement 2 and the fireproof sheath 9 to prevent it from sliding freely on the cable body 1, thereby achieving a certain limiting effect. The wear-resistant bag 22 is filled with a non-Newtonian fluid 23. Non-Newtonian flow has the characteristic of becoming stronger when encountering strong forces and weaker when encountering weak forces. When the wear-resistant bag 22 is subjected to slight collision and friction, it will be softer, and when the wear-resistant bag 22 is suddenly subjected to strong impact, it will become hard, which can not only make the cable body 1 easy to bend, but also provide effective support and protection to the cable body 1, thereby improving the practicality of the cable body 1.

[0021] The cable body 1 comprises a cable housing 3 with a fireproof sheath 9 on the outside;

[0022] Furthermore, the fireproof sheath 9 is a B1 grade 125 degree high fireproof cross-linked polyolefin; the fireproof sheath 9 is difficult to burn or even non-flammable, which effectively prevents the spread of fire, and the fireproof sheath 9 can be used normally at a high temperature of 125 degrees Celsius, and will not emit pollutants, so as to ensure the stability of the fireproof sheath 9 and improve safety. The fireproof sheath 9 also adopts accelerator irradiation double cross-linking, and the overall structure meets the relevant requirements of low smoke, heat release, low carbonization, carbonization pH, etc. in the type test (bundle combustion), and complies with relevant national standards.

[0023] The inner wall of the cable housing 3 is fixed with radially uniformly arranged dividing strips 4, which are emitted from the center of the cable housing 3 to the edge of the cable housing 3, and the starting ends of all the dividing strips 4 are connected to each other, and inner cores are abutted between adjacent dividing strips 4, and the dividing strips 4 include an insulating layer 42, and both sides of the insulating layer 42 are covered with a fireproof layer 41; the fireproof layer 41 is used to isolate various areas in the cable housing 3 to prevent the conductor 5 from spreading to other areas when it catches fire, thereby improving safety, and the insulating layer 42 is used to isolate each area from each other, and the conductor 5 is isolated from the outside world, so as to prevent the conductor 5 from short-circuiting and ensure the normal transmission of electric energy;

[0024] Specifically, by arranging a partition strip 4 in the cable casing 3, the inner cavity of the cable casing 3 is divided into different areas by using the partition strip 4, and the inner cores are placed in different areas respectively, so that the inner cores are isolated from each other. Compared with the prior art, when one of the inner cores catches fire, the fireproof layer 41 can be used to prevent the fire from spreading to other areas, thereby suppressing the development of the fire, effectively limiting the fire range of the cable, and greatly improving the fireproof performance.

[0025] The inner core includes a conductor 5;

[0026] Furthermore, the conductor 5 is set as a Class 6 soft high alloy conductor and is a tinned alloy conductor with a small bending radius. In practical applications, the cable body 1 is easier to bend and easy to use, and the conductor is round and compact. At the same time, the single wire resistivity of the alloy conductor is <0.0178Ω·mm 2 , so that it has higher conductivity, the resistance of the stranded alloy conductor is 2% higher than the standard, it is not easily affected by mechanical stress, the strength of the conductor 5 is improved, and the high temperature stability of the conductor 5 is also improved;

[0027] The conductor 5 is provided with a flame retardant layer 8, and the cable housing 3 is also filled with a moisture-proof layer 6 to block water vapor from the inner core, prevent water vapor from invading the conductor 5, and prevent the cable body 1 from short-circuiting;

[0028] Furthermore, the conductor 5 is covered with an insulating shell 7, which is a hollow insulating shell, and the flame retardant layer 8 is filled in the inner cavity of the insulating shell 7, so as to suppress the spread of fire by using the flame retardant layer 8;

[0029] Furthermore, the insulating shell 7 is a highly cross-linked high insulation resistance cross-linked polyolefin, which is cross-linked by accelerator radiation, and the molecular structure of the insulating inner layer material is changed from a linear shape to a fork-shaped or triangular structure, so that its temperature resistance level is ≥150°C, and it will not short-circuit or disconnect under high temperature or fire conditions, avoiding secondary accidents;

[0030] Specifically, by providing the conductor 5, the insulating shell 7 and the flame retardant layer 8, the conductor 5 is wrapped by the hollow insulating shell 7 to achieve the purpose of insulation. At the same time, when the conductor 5 reaches a high temperature and then catches fire, the flame retardant layer 8 can be used to reduce the spread of the fire by slowing down the burning speed of the material, reducing the temperature of the surface of the material, and preventing oxygen from contacting the material, thereby reducing losses and reducing personal injuries, and improving safety of use.

[0031] Furthermore, the inner cavity of the insulating shell 7 is also provided with heat dissipation pipes 10 evenly arranged along the circumference of the conductor 5, and the heat dissipation pipes 10 protrude toward the side away from the conductor 5;

[0032] Specifically, the working heat of the conductor 5 is dissipated outwards through the heat dissipation pipe 10 , thereby suppressing the rising trend of the working temperature and effectively slowing down the aging of the insulating shell 7 .

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A highly fireproof solar photovoltaic cable, comprising a cable body (1) uniformly provided with reinforcement members (2), characterized in that: The cable body (1) comprises a cable casing (3) with a fireproof sheath (9) on the outside, the inner wall of the cable casing (3) is fixed with radially uniformly arranged dividing strips (4), an inner core is provided between adjacent dividing strips (4), the dividing strips (4) comprise an insulating layer (42), both sides of the insulating layer (42) are covered with a fireproof layer (41), the inner core comprises a conductor (5), the conductor (5) is provided with a flame retardant layer (8), and the cable casing (3) is also filled with a moisture-proof layer (6).

2. A highly fireproof solar photovoltaic cable according to claim 1, characterized in that: The reinforcing member (2) comprises an annular sleeve (21) sleeved on the fireproof sheath (9), the annular sleeve (21) being provided with a wear-resistant bag (22), and the wear-resistant bag (22) being filled with a non-Newtonian fluid (23).

3. A highly fireproof solar photovoltaic cable according to claim 1, characterized in that: The conductor (5) is provided with an insulating shell (7) on its outer sleeve, the insulating shell (7) is a hollow insulating shell, and the flame retardant layer (8) is filled in the inner cavity of the insulating shell (7).

4. A highly fireproof solar photovoltaic cable according to claim 3, characterized in that: The inner cavity of the insulating shell (7) is also provided with heat dissipation pipes (10) evenly arranged along the circumference of the conductor (5).

5. A highly fireproof solar photovoltaic cable according to claim 1, characterized in that: The conductor (5) is a Class 6 soft high alloy conductor and is a tinned alloy conductor.

6. A highly fireproof solar photovoltaic cable according to claim 1, characterized in that: The fireproof sheath (9) is made of B1 grade 125 degree high fireproof cross-linked polyolefin.

7. A highly fireproof solar photovoltaic cable according to claim 3, characterized in that: The insulating shell (7) is made of highly cross-linked high insulation resistance cross-linked polyolefin.

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