Insulated photovoltaic cable with sheath and installation method

Abstract

The invention discloses an insulated photovoltaic cable with a sheath, which comprises a cable body and a gradient hydrophobic coating coated on the surface of the cable body, and is characterized in that the cable body comprises an outer sheath, a steel tape armoring layer, a wrapping lining layer, an insulated inner sleeve and a conductor, the inner side of the outer sheath is connected with the steel tape armoring layer, and the inner side of the outer sheath is connected with the steel tape armoring layer; the inner side of the steel tape armoring layer is connected with the wrapping lining layer, the insulating inner sleeves are divided into a plurality of groups and are uniformly distributed in the wrapping lining layer, the conductors are arranged in the insulating inner sleeves, and a heat dissipation mechanism is arranged in the cable body. The heat dissipation mechanism comprises a plurality of groups of heat dissipation cavities uniformly formed in the inner side of the outer sheath and heat dissipation inner parts located between the insulating inner sleeves; the heat dissipation cavities are located at the joint of the outer sheath and the steel tape armoring layer, and reset gaskets are arranged in the heat dissipation cavities. According to the photovoltaic cable designed by the invention, the gradient hydrophobic coating is designed on the sheath, so that the waterproof and anti-aging effects of the cable can be effectively improved, and the heat dissipation performance of the photovoltaic cable is ensured through an internal heat dissipation structure.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic cables, in particular to an insulated photovoltaic cable with a sheath and an installation method thereof. Background Art

[0002] Photovoltaic cables are specialized cables used in solar photovoltaic power generation systems. They connect solar panels, inverters, and power grids, effectively converting and transmitting solar energy. They play a crucial role in solar photovoltaic systems, transmitting the direct current (DC) generated by solar panels and converting it into alternating current (AC), which is then fed into the power grid, providing clean energy for homes, industries, and more.

[0003] However, existing photovoltaic cables have the following problems during use: When exposed to moisture or salt spray, the cables age faster, leading to short circuits. Furthermore, the protective coating applied to the surface of the photovoltaic cables increases the cable thickness, affecting the heat dissipation during operation. Over time, this can easily lead to internal damage, shortening the cable's service life. Therefore, a corresponding technical solution is needed to address these existing technical issues. Summary of the Invention

[0004] The purpose of the present invention is to provide an insulated photovoltaic cable with a sheath and an installation method, which solves the technical problem that when the photovoltaic cable is in a humid or salt fog environment, the cable aging will be accelerated, resulting in a short circuit. The corresponding protective coating designed on the surface of the photovoltaic cable will increase the thickness of the cable, affecting the heat dissipation effect of the cable during operation, and easily causing damage to the inside of the cable for a long time, thereby affecting the service life of the cable.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an insulated photovoltaic cable with a sheath, comprising a cable body and a gradient hydrophobic coating applied to the surface of the cable body, the cable body comprising an outer sheath, a steel tape armor layer, a wrapped inner lining layer, an insulating inner sheath and a conductor, the inner side of the outer sheath being connected to the steel tape armor layer, the inner side of the steel tape armor layer being connected to the wrapped inner lining layer, the insulating inner sheath being divided into several groups and evenly distributed inside the wrapped inner lining layer, the conductor being built into the insulating inner sheath, a heat dissipation mechanism being provided inside the cable body, the heat dissipation mechanism comprising several groups of heat dissipation cavities evenly opened on the inner side of the outer sheath and heat dissipation cavities located on the insulating inner sheath The heat dissipation inner part is located between the outer sheath and the steel belt armor layer and a reset gasket is arranged inside. The heat dissipation inner part includes a heat dissipation cavity tube and several groups of heat dissipation side plates evenly distributed on the periphery of the heat dissipation cavity tube. Several groups of heat dissipation holes are evenly opened on the surface of the heat dissipation cavity tube. The heat dissipation holes are connected with the heat dissipation side plates. The heat dissipation side plates are located between two adjacent groups of insulating inner sleeves and a heat-conducting inner cavity is formed inside. The heat-conducting inner cavity is connected with the heat dissipation holes. The surface of the heat dissipation side plates has a porous structure. The gradient hydrophobic coating is divided into two layers, namely a waterproof outer layer and a hygroscopic inner layer. The hygroscopic inner layer is located on the inner side of the waterproof outer layer and coated on the surface of the outer sheath.

[0006] As a preferred embodiment of the present invention, the reset gasket is made of elastic rubber material and is formed into a corrugated structure, and the upper and lower protruding ends of the reset gasket are respectively connected to the upper and lower inner walls of the heat dissipation cavity.

[0007] As a preferred embodiment of the present invention, the heat dissipation cavity tube is made of polyvinyl chloride resin material and has an overall tubular structure. The diameter of the heat dissipation cavity tube is equal to one fifth of the cross-sectional diameter of the cable body.

[0008] As a preferred embodiment of the present invention, the heat dissipation side plate is in a V-shaped structure as a whole and its edges are in contact with the outer walls of two adjacent groups of insulating inner sleeves. The heat dissipation side plate is made of polyvinyl chloride resin material.

[0009] As a preferred embodiment of the present invention, the waterproof outer layer adopts polyurethane waterproof coating and has a thickness of 0.2mm-0.4mm.

[0010] As a preferred embodiment of the present invention, the hygroscopic inner layer is made of polyethylene material and the surface is processed into a honeycomb structure. The thickness of the hygroscopic inner layer is 0.3 mm to 0.5 mm.

[0011] As a preferred embodiment of the present invention, the specific installation method is as follows:

[0012] Step 1: Cable outer surface treatment: Before coating, use a cleaning agent to clean the dust, oil and debris on the cable surface to remove dirt, and then let the cleaned cable surface dry naturally;

[0013] Step 2: Melting preparation of gradient hydrophobic coating: Heat the waterproof outer layer made of polyurethane material and the moisture-absorbing inner layer made of polyethylene material to a molten state for standby use;

[0014] Step 3: Cable outer surface coating: First, use a sprayer to evenly apply the polyethylene solution used for the hygroscopic inner layer on the surface of the outer sheath, and spray repeatedly until the thickness of the hygroscopic inner layer reaches 0.3mm-0.5mm. After coating is completed, the hygroscopic inner layer is heated, dried and cured. After curing is completed, a sprayer is used to evenly apply the polyurethane solution used for the waterproof outer layer on the surface of the hygroscopic inner layer. Repeated spraying until the thickness of the hygroscopic inner layer reaches 0.2mm-0.4mm. After coating is completed, the hygroscopic inner layer is heated, dried and cured to complete the coating of the gradient hydrophobic coating.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention optimizes the design of the existing photovoltaic cable structure and adopts a gradient hydrophobic coating on the cable sheath. The gradient hydrophobic coating is designed with a waterproof outer layer and a moisture-absorbing inner layer, which can improve the waterproof effect of the cable. In order to solve the heat dissipation problem caused by the increase in the thickness of the gradient hydrophobic coating on the surface of the cable jacket, a heat dissipation structure is designed inside the cable, thereby ensuring the heat dissipation effect of the photovoltaic cable during use and extending the service life of the photovoltaic cable.

[0017] 2. The photovoltaic cable designed in the present invention is designed with a gradient hydrophobic coating on the sheath, which can effectively improve the waterproof and anti-aging effects of the cable, and ensure the heat dissipation of the photovoltaic cable through the internal heat dissipation structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a cross-sectional view of the photovoltaic cable of the present invention;

[0019] Figure 2 This is a distribution structure diagram of the gradient hydrophobic coating of the present invention;

[0020] Figure 3 This is a structural diagram of the heat dissipation cavity of the present invention;

[0021] Figure 4 This is a structural diagram of the heat dissipation internal components described in the present invention.

[0022] In the figure: 1. Outer sheath; 2. Steel tape armor layer; 3. Wrapped inner lining layer; 4. Insulating inner sheath; 5. Conductor; 6. Heat dissipation cavity; 7. Heat dissipation inner parts; 8. Reset gasket; 9. Heat dissipation cavity tube; 10. Heat dissipation side plate; 11. Heat dissipation hole; 12. Heat-conducting inner cavity; 13. Waterproof outer layer; 14. Moisture-absorbing inner layer. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] See also Figure 1-4 The present invention provides a technical solution: an insulated photovoltaic cable with a sheath, comprising a cable body and a gradient hydrophobic coating applied on the surface of the cable body, the cable body comprising an outer sheath 1, a steel tape armor layer 2, a wrapped inner lining layer 3, an insulating inner sheath 4 and a conductor 5, the inner side of the outer sheath 1 is connected to the steel tape armor layer 2, the inner side of the steel tape armor layer 2 is connected to the wrapped inner lining layer 3, the insulating inner sheath 4 is divided into several groups and evenly distributed inside the wrapped inner lining layer 3, the conductor 5 is built into the insulating inner sheath 4, a heat dissipation mechanism is provided inside the cable body, the heat dissipation mechanism comprises several groups of heat dissipation cavities 6 evenly opened on the inner side of the outer sheath 1 and a heat dissipation inner part 7 located between the insulating inner sheaths 4, the heat dissipation cavities 6 is located at the connection between the outer sheath 1 and the steel belt armor layer 2 and is provided with a reset gasket 8 inside. The heat dissipation internal part 7 includes a heat dissipation cavity tube 9 and several groups of heat dissipation side plates 10 evenly distributed on the periphery of the heat dissipation cavity tube 9. Several groups of heat dissipation holes 11 are evenly opened on the surface of the heat dissipation cavity tube 9. The heat dissipation holes 11 are connected to the heat dissipation side plates 10. The heat dissipation side plates 10 are located between two adjacent groups of insulating inner sleeves 4 and have a heat-conducting inner cavity 12 formed therein. The heat-conducting inner cavity 12 is connected to the heat dissipation holes 11. The surface of the heat dissipation side plates 10 has a porous structure. The gradient hydrophobic coating is divided into two layers, namely a waterproof outer layer 13 and a hygroscopic inner layer 14. The hygroscopic inner layer 14 is located on the inner side of the waterproof outer layer 13 and is coated on the surface of the outer sheath 1.

[0025] A gradient hydrophobic coating is used on the cable sheath. The gradient hydrophobic coating is designed with a waterproof outer layer 13 and a moisture-absorbing inner layer 14, which can improve the waterproof effect of the cable. In order to solve the heat dissipation problem caused by the increase in the thickness of the gradient hydrophobic coating on the surface of the cable jacket, a heat dissipation structure is designed inside the cable, thereby ensuring the heat dissipation effect of the photovoltaic cable during use and extending the service life of the photovoltaic cable.

[0026] Further improvement, such as Figure 3As shown, the reset gasket 8 is made of elastic rubber material and is processed into a corrugated structure. The upper and lower protruding ends of the reset gasket 8 are respectively connected to the upper and lower inner walls of the heat dissipation cavity.

[0027] Further improvement, such as Figure 4 As shown, the heat dissipation cavity tube 9 is made of polyvinyl chloride resin material and has an overall tubular structure. The diameter of the heat dissipation cavity tube 9 is equal to one fifth of the cross-sectional diameter of the cable body.

[0028] Further improvement, such as Figure 4 As shown, the heat dissipation side plate 10 is in a V-shaped structure as a whole, and its edge contacts the outer walls of two adjacent groups of insulating inner sleeves 4. The heat dissipation side plate 10 is made of polyvinyl chloride resin material.

[0029] Further improvement, such as Figure 2 As shown, the waterproof outer layer 13 is made of polyurethane waterproof coating and has a thickness of 0.2mm-0.4mm.

[0030] Further improvement, such as Figure 2 As shown, the hygroscopic inner layer 14 is made of polyethylene material and its surface is processed into a honeycomb structure. The thickness of the hygroscopic inner layer 14 is 0.3mm-0.5mm.

[0031] Specifically, the specific installation method is as follows:

[0032] Step 1: Cable outer surface treatment: Before coating, use a cleaning agent to clean the dust, oil and debris on the cable surface to remove dirt, and then let the cleaned cable surface dry naturally;

[0033] Step 2: Gradient hydrophobic coating melting preparation: Heat the waterproof outer layer 13 made of polyurethane material and the moisture-absorbing inner layer 14 made of polyethylene material to a molten state for standby use;

[0034] Step 3: Cable outer surface coating: First, use a sprayer to evenly apply the polyethylene solution used for the hygroscopic inner layer 14 on the surface of the outer sheath 1, and spray repeatedly until the thickness of the hygroscopic inner layer 14 reaches 0.3mm-0.5mm. After coating is completed, the hygroscopic inner layer 14 is heated, dried and cured. After curing is completed, the waterproof outer layer 13 is evenly applied to the surface of the hygroscopic inner layer 14 using a polyurethane solution through a sprayer. Repeated spraying until the thickness of the hygroscopic inner layer 14 reaches 0.2mm-0.4mm. After coating is completed, the hygroscopic inner layer 14 is heated, dried and cured to complete the coating of the gradient hydrophobic coating.

[0035] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one such feature.

[0037] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0038] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An insulated photovoltaic cable with a sheath, characterized in that: The invention comprises a cable body and a gradient hydrophobic coating applied on the surface of the cable body, wherein the cable body comprises an outer sheath (1), a steel tape armor layer (2), a wrapped inner lining layer (3), an insulating inner sheath (4) and a conductor (5), wherein the inner side of the outer sheath (1) is connected to the steel tape armor layer (2), the inner side of the steel tape armor layer (2) is connected to the wrapped inner lining layer (3), the insulating inner sheath (4) is divided into several groups and evenly distributed inside the wrapped inner lining layer (3), the conductor (5) is built into the insulating inner sheath (4), and a heat dissipation mechanism is provided inside the cable body, wherein the heat dissipation mechanism comprises several groups of heat dissipation cavities (6) evenly opened on the inner side of the outer sheath (1) and a heat dissipation inner part (7) located between the insulating inner sheath (4), the heat dissipation cavities (6) are located between the outer sheath (1), the steel tape armor layer (2) and the inner lining layer (3). The heat dissipation inner part (7) comprises a heat dissipation cavity tube (9) and a plurality of heat dissipation side plates (10) evenly distributed on the periphery of the heat dissipation cavity tube (9). The surface of the heat dissipation cavity tube (9) is evenly provided with a plurality of heat dissipation holes (11). The heat dissipation holes (11) are connected with the heat dissipation side plates (10). The heat dissipation side plates (10) are located between two adjacent groups of insulating inner sleeves (4) and have a heat-conducting inner cavity (12) formed therein. The heat-conducting inner cavity (12) is connected with the heat dissipation holes (11). The surface of the heat dissipation side plates (10) is porous. The gradient hydrophobic coating is divided into two layers, namely a waterproof outer layer (13) and a hygroscopic inner layer (14). The hygroscopic inner layer (14) is located on the inner side of the waterproof outer layer (13) and is coated on the surface of the outer sheath (1).

2. The insulated photovoltaic cable with a sheath according to claim 1, characterized in that: The reset gasket (8) is made of elastic rubber material and is processed into a corrugated structure. The upper and lower protruding ends of the reset gasket (8) are respectively connected to the upper and lower inner walls of the heat dissipation cavity.

3. The insulated photovoltaic cable with a sheath according to claim 1, characterized in that: The heat dissipation cavity tube (9) is made of polyvinyl chloride resin material and has an overall tubular structure. The diameter of the heat dissipation cavity tube (9) is equal to one fifth of the cross-sectional diameter of the cable body.

4. The insulated photovoltaic cable with a sheath according to claim 1, characterized in that: The heat dissipation side plate (10) is in a V-shaped structure as a whole, and its edges are in contact with the outer walls of two adjacent groups of insulating inner sleeves (4). The heat dissipation side plate (10) is made of polyvinyl chloride resin material.

5. The insulated photovoltaic cable with a sheath according to claim 1, characterized in that: The waterproof outer layer (13) adopts polyurethane waterproof coating and has a thickness of 0.2mm-0.4mm.

6. The insulated photovoltaic cable with a sheath according to claim 1, characterized in that: The hygroscopic inner layer (14) is made of polyethylene material and its surface is processed and formed into a honeycomb structure. The thickness of the hygroscopic inner layer (14) is 0.3 mm to 0.5 mm.

7. A method for installing a sheathed insulated photovoltaic cable according to any one of claims 1 to 6, characterized in that: The specific installation method is as follows: Step 1: Cable outer surface treatment: Before coating, use a cleaning agent to clean the dust, oil and debris on the cable surface to remove dirt, and then let the cleaned cable surface dry naturally; Step 2: Gradient hydrophobic coating melting preparation treatment: Heat the waterproof outer layer (13) made of polyurethane material and the hygroscopic inner layer (14) made of polyethylene material to a molten state for standby use; Step 3: Cable outer surface coating treatment: First, the polyethylene solution used for the hygroscopic inner layer (14) is evenly coated on the surface of the outer sheath (1) by a sprayer, and the spraying is repeated until the thickness of the hygroscopic inner layer (14) reaches 0.3mm-0.5mm. After the coating is completed, the hygroscopic inner layer (14) is heated, dried and cured. After the curing is completed, the waterproof outer layer (13) is evenly coated on the surface of the hygroscopic inner layer (14) using a polyurethane solution by a sprayer, and the spraying is repeated until the thickness of the hygroscopic inner layer (14) reaches 0.2mm-0.4mm. After the coating is completed, the hygroscopic inner layer (14) is heated, dried and cured to complete the coating of the gradient hydrophobic coating.

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