Waterproof cable for photovoltaic power generation

Abstract

The invention relates to the technical field of cables, and provides a waterproof cable for photovoltaic power generation, which comprises a cable body, a plurality of cable conductors are arranged in the cable body, the cable conductors are coated with insulating layers, the plurality of insulating layers are coated with a filling layer, and the filling layer is sequentially coated with a belting layer, a first waterproof sheath and a shielding layer. The cable further comprises a second waterproof sheath, a butt-joint conductive assembly, a butt-joint protection assembly and an end waterproof assembly, the second waterproof sheath wraps the shielding layer, the butt-joint conductive assembly is installed between the cable conductors in the two cable bodies, the butt-joint protection assembly is installed outside the butt-joint protection assembly, and the end waterproof assembly is installed between the butt-joint conductive assembly and the butt-joint protection assembly. According to the technical scheme, the problem that in the prior art, when a photovoltaic cable is laid outdoors, due to the fact that a cable head is not sealed tightly, a conductive part of the cable makes contact with water, and the cable is prone to open circuit and electric leakage is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a waterproof cable for photovoltaic power generation. Background Art

[0002] Photovoltaic power generation is a power generation technology that uses the photoelectric effect of semiconductor materials to directly convert solar energy into electrical energy. The core of this technology is photovoltaic cells, inverters and photovoltaic cables. Photovoltaic cable is a cable specially designed for solar photovoltaic power generation systems. The most basic function of photovoltaic cable is to connect photovoltaic cells and inverters, transmit the DC power generated by photovoltaic cells to the inverter, and then convert it into AC power by the inverter for home or industrial use.

[0003] Waterproofing is particularly important during the installation and use of photovoltaic systems. Since photovoltaic cables are usually laid outdoors, they are greatly affected by weather changes, especially in southeastern coastal areas such as Guangdong and Hangzhou, where rainfall is more frequent and cables are more likely to be exposed to moisture. Although the cables are sealed when leaving the factory, in actual use, since cables often need to cross roads and bridges, a large amount of water often accumulates in the cable trenches used for laying cables. During the laying process, the cable heads will inevitably be immersed in water. If the cable is not sealed tightly, or the connection between the two cables is loose or damaged, the conductive part of the cable will be exposed to the air or humid environment for a long time, causing water vapor to enter the cable.

[0004] After water enters the cable, the risk of short circuit and leakage will increase. In addition, after water enters the cable, "water tree aging" will occur under the action of the electromagnetic field, which will cause the insulation performance of the cable to deteriorate and may eventually cause the cable to be broken down by current, posing a huge safety hazard. Summary of the invention

[0005] The present invention provides a waterproof cable for photovoltaic power generation, which solves the problem in the prior art that when the photovoltaic cable is laid outdoors, the cable head is not tightly sealed, causing the conductive part of the cable to contact with water, resulting in the cable being prone to circuit breaking and leakage.

[0006] The technical solution of the present invention is as follows: A waterproof cable for photovoltaic power generation, comprising a cable body, a plurality of cable conductors arranged in the cable body, each of the cable conductors being coated with an insulating layer, a plurality of insulating layers being coated with a filling layer, a filling layer being coated with a tape layer, a first waterproof sheath being coated with a shielding layer, and further comprising: A second waterproof sheath, the shielding layer is coated with the second waterproof sheath outside; A butt-jointed conductive component is installed between the plurality of cable conductors in two cable bodies for transmitting power; A docking protection assembly, the docking protection assembly is installed outside the docking protection assembly and is used to protect the connection between the plurality of cable conductors; End waterproof components, both ends of the first waterproof sheath are fixedly mounted with the end waterproof components for waterproofing; An outer shell, wherein the outer shell is detachably and symmetrically mounted between the two second waterproof jackets; A gap waterproof component is provided inside the two shells to prevent external water from entering the inside of the shells.

[0007] On the basis of the above-mentioned solution, the docking conductive component comprises: A wiring terminal, wherein the wiring terminal is fixedly installed between the plurality of cable conductors in two of the cable bodies; A heat shrinkable sheath is provided on each of the wiring terminals, and the inner side of the heat shrinkable sheath abuts against the insulating layer.

[0008] Based on the above solution, the docking protection component includes: A fixing sleeve, which is provided at one end of the two butted cable bodies and is fixedly connected to the first waterproof sheath; A protective sleeve, wherein the protective sleeve is arranged between the two fixing sleeves, and the plurality of heat shrinkable sleeves are located inside the protective sleeve; A fixing part, which is mounted on the protective sleeve and is used to fix the relative position of the protective sleeve and the fixing sleeve; A supporting portion is installed inside the protective sleeve and is used to support the protective sleeve.

[0009] On the basis of the above solution, the fixing part comprises: Clamps, two clamps are symmetrically and detachably arranged on the two fixing sleeves, the protective sleeve is located between the clamps and the fixing sleeves, and the inner side of the clamps abuts against the protective sleeves; Arc grooves, a plurality of arc grooves are evenly spaced on the two fixing sleeves, and the arc grooves abut against the protective sleeves; Arc-shaped protrusions, a plurality of the arc-shaped protrusions are fixedly installed at equal distances inside the clamp, the arc-shaped protrusions are adapted to the arc-shaped grooves, and the arc-shaped protrusions abut against the protective sleeve; A first elastic ring is provided between the two clamps outside the two fixing sleeves.

[0010] On the basis of the above solution, the support part comprises: A support frame, the support frame is arranged between the plurality of heat shrinkable sleeves, and the outer side of the support frame abuts against the inner side of the protective sleeve; Support grooves, a plurality of support grooves are provided on the support frame at equal angles in a circular shape, the plurality of support grooves correspond to the plurality of heat shrinkable sleeves one by one, and the support grooves abut against the heat shrinkable sleeves.

[0011] Based on the above solution, the terminal waterproof assembly includes: A clamping frame, two clamping frames are symmetrically arranged at one end of the two cable bodies where they are butted, and every two adjacent clamping frames are detachably connected; A rubber sleeve is fixedly installed inside each of the clamping frames, and the rubber sleeve is offset from the clamping frame.

[0012] In addition to the above solutions, it also includes: Wherein, the rubber sleeves in every two matched clamping frames are adapted, one end of the rubber sleeve away from the support frame abuts against the second waterproof protective sleeve, and the other end of the rubber sleeve abuts against the protective sleeve; A second elastic ring is tensionedly sleeved between the two adapted clamping frames.

[0013] Based on the above solution, the gap waterproof component includes: A fixing ring, one end of the two second waterproof sheaths butting against each other is provided with the fixing ring, and the inner sides of the two outer shells are respectively in contact with the two fixing rings; An upper sealing strip, wherein the upper sealing strip is disposed between the two second waterproof sheaths and the outer shell; A lower sealing strip, which is disposed at the lower part of the two upper sealing strips, the lower sealing strip is adapted to the upper sealing strips, and the lower sealing strip is located between the second waterproof sheath and the outer shell; A sealing part is installed on both the upper sealing strip and the lower sealing strip for sealing.

[0014] On the basis of the above solution, the sealing part comprises: Raised strips, a plurality of raised strips are evenly spaced on the inner and outer sides of the two upper sealing strips and the inner and outer sides of the two lower sealing strips; The convex strips on the outer sides of the upper sealing strip and the lower sealing strip abut against the inner side of the outer shell, and the convex strips on the inner sides of the upper sealing strip and the lower sealing strip abut against the second waterproof sheath.

[0015] In addition to the above solutions, it also includes: Slots, a plurality of slots are provided at equal distances at both ends of the two lower sealing strips; Insertion strips, a plurality of the insertion strips are evenly spaced at both ends of the two upper sealing strips, and the plurality of the insertion strips correspond one-to-one to the plurality of the slots.

[0016] The working principle and beneficial effects of the present invention are: 1. In the present invention, the heat shrinkable sheath shrinks radially, and the internal hot melt adhesive layer melts, so that the heat shrinkable sheath can be tightly wrapped on the surface of the terminal, and the inner sides of both ends of the heat shrinkable sheath also overlap with the corresponding insulating layer to form a strong protective layer, thereby protecting the cable conductor from water intrusion and improving the waterproofness of the cable conductor.

[0017] 2. In the present invention, clamps are installed on the outside of two corresponding fixing sleeves. At this time, the arc-shaped protrusions at the bottom of the clamps correspond to the arc-shaped grooves on the outside of the fixing sleeves. The first elastic ring is put on the corresponding two clamps to fix the position of the protective sleeve. At this time, the protective sleeve is pressurized to produce a wavy deformation under the cooperation of the arc-shaped grooves and the arc-shaped protrusions, thereby improving the waterproof performance of the photovoltaic cable.

[0018] 3. In the present invention, the adapted upper sealing strip and lower sealing strip are placed at the positions corresponding to the second waterproof sheath, so that the insert strip of the upper sealing strip corresponds to the slot of the lower sealing strip, and the upper sealing strip and the lower sealing strip are butted together through the cooperation of the insert strip and the slot, the inner sides of the two ends of the outer shell abut against the convex strips on the outer sides of the upper sealing strip and the lower sealing strip, and the second waterproof sheath also abuts against the convex strips on the inner sides of the upper sealing strip and the lower sealing strip. After the outer shell is installed, the convex strip is deformed, which is convenient for sealing the gap between the outer shell and the second waterproof sheath, thereby improving the waterproof performance of the cable joint.

[0019] 4. In the present invention, the waterproofness of the cable conductor connection is improved by the cooperation of the docking conductive component and the docking protective component. Through the setting of the end protection component, not only pressure is provided on the edge of the protective sleeve, making the connection between the protective sleeve and the first waterproof sleeve tighter, but also external water can be prevented from entering the shielding layer of the cable body, thereby reducing the occurrence of water tree aging phenomenon. Through the cooperation with the gap waterproof component, the waterproofness of the docking position of the cable body is improved while the service life of the cable is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the cable body in the present invention; Figure 3 It is a schematic diagram of the structure of the docking protection component, the end waterproof component and the gap waterproof component in the present invention; Figure 4 It is a schematic diagram of the structure of the docking conductive component, the docking protection component and the terminal waterproof component in the present invention; Figure 5 It is a schematic cross-sectional structure diagram of the butted conductive components in the present invention; Figure 6 It is a schematic cross-sectional structural diagram of the docking protection assembly in the present invention; Figure 7 For the present invention Figure 7 A schematic diagram of the local enlarged structure at point A in the middle; Figure 8 It is a schematic cross-sectional structure diagram of the fixing part in the present invention; Fig. 9 It is a schematic diagram of the cross-sectional structure of the support part in the present invention; Fig.10 It is a cross-sectional structural diagram of the cooperation between the terminal waterproof component and the protective cover in the present invention; Fig.11 It is a schematic cross-sectional structure diagram of the terminal waterproof assembly in the present invention; Fig.12 For the present invention Fig.11 A schematic diagram of the local enlarged structure at B in the middle; Fig.13 It is a cross-sectional structural schematic diagram of the cooperation between the clamping frame, the rubber sleeve and the second elastic ring in the present invention; Fig.14 It is a schematic diagram of the structure of the gap waterproof component in the present invention.

[0022] In the figure: 1. cable conductor; 2. insulation layer; 3. filling layer; 4. tape layer; 5. first waterproof sheath; 6. shielding layer; 7. second waterproof sheath; 8. outer shell; 9. terminal; 10. heat shrink sheath; 11. fixing sheath; 12. protective sheath; 13. clamp; 14. arc groove; 15. arc protrusion; 16. first elastic ring; 17. support frame; 18. support groove; 19. clamping frame; 20. rubber sleeve; 21. second elastic ring; 22. fixing ring; 23. upper sealing strip; 24. lower sealing strip; 25. convex strip; 26. slot; 27. insert strip. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0024] like Figures 1 to 14 As shown, this embodiment proposes a waterproof cable for photovoltaic power generation, including a cable body, a plurality of cable conductors 1 are arranged in the cable body, each cable conductor 1 is coated with an insulating layer 2 on the outside, a plurality of insulating layers 2 are coated with a filling layer 3 on the outside, the filling layer 3 is coated with a tape layer 4 on the outside, the tape layer 4 is coated with a first waterproof sheath 5 on the outside, the first waterproof sheath 5 is coated with a shielding layer 6 on the outside, and also includes a second waterproof sheath 7, a docking conductive component, a docking protective component, an end waterproof component, an outer shell 8 and a gap waterproof component, the shielding layer 6 is coated with a second waterproof sheath 7 on the outside, a docking conductive component is installed between the plurality of cable conductors 1 in the two cable bodies for transmitting electricity, the docking conductive component includes a wiring terminal 9 and a heat shrinkable sheath 10, a wiring terminal 9 is fixedly installed between the plurality of cable conductors 1 in the two cable bodies, each wiring terminal 9 is coated with a heat shrinkable sheath 10, and the inner side of the heat shrinkable sheath 10 is in contact with the insulating layer 2.

[0025] Specifically, when laying photovoltaic cables, when two photovoltaic cables need to be connected, first, the ends of the two cable bodies that need to be connected are broken open to expose the cable conductor 1 and the insulation layer 2, and then the multiple insulation layers 2 are broken open to expose the cable conductor 1, and then the corresponding multiple cable conductors 1 are matched one by one, and a heat shrink sheath 10 is first put on each two cable conductors 1 that need to be connected, and then the corresponding multiple cable conductors 1 are connected together using the terminal 9, and then the heat shrink sheath 10 is moved to the corresponding terminal 9 and the position is determined to be appropriate, and the heat shrink sheath 10 is evenly heated using a heat source such as a hot air gun or a hair dryer. During the heating process, the temperature should be evenly distributed to avoid local overheating that may cause material damage. At this time, the heat shrinkable sheath 10 shrinks radially, and the internal hot melt adhesive layer melts, so that the heat shrinkable sheath 10 can be tightly wrapped around the surface of the terminal 9, and the inner sides of both ends of the heat shrinkable sheath 10 also overlap with the corresponding insulating layer 2 to form a solid protective layer, thereby protecting the cable conductor 1 from water intrusion. Then, the second waterproof sheath 7 and the shielding layer 6 of the cable body are dismantled, and then the docking protection component is installed on the first waterproof sheath 5 to further protect the docking point of the cable conductor 1. Then, the end protection component is installed to prevent external water vapor from invading the shielding layer 6 of the cable body. Finally, under the action of the gap waterproof component, the outer shell 8 is installed to prevent water vapor from entering the docking position of the cable from the docking position where the outer shell 8 and the second waterproof sheath 7 are docked, thereby improving the waterproof performance.

[0026] like Figures 3 to 6As shown, the docking protection component is installed outside the docking protection component and is used to protect the connection between multiple cable conductors 1. The docking protection component includes a fixing sleeve 11, a protective sleeve 12, a fixing part and a supporting part. The ends of the two cable bodies that are docked are each provided with a fixing sleeve 11, the fixing sleeve 11 is fixedly connected to the first waterproof sleeve 5, the protective sleeve 12 is sleeved between the two fixing sleeves 11, and multiple heat shrink sleeves 10 are located inside the protective sleeve 12. The fixing part is installed on the protective sleeve 12 for fixing the relative position of the protective sleeve 12 and the fixing sleeve 11, and the supporting part is installed inside the protective sleeve 12 for supporting the protective sleeve 12.

[0027] Specifically, after the second waterproof sheath 7 and the shielding layer 6 of the cable body are dismantled, the second waterproof sheath 7 is exposed. Before connecting the cable conductor 1, the protective sheath 12 is put on the second waterproof sheath 7, and then the waterproof glue is applied to the inside of the fixing sheath 11, and the fixing sheath 11 is put on the corresponding end of the first waterproof sheath 5. After the waterproof glue is dry and the cable conductor 1 has been connected, the support part is placed between the multiple heat shrinkable sheaths 10 to support the heat shrinkable sheaths 10, and then the protective sheath 12 is moved to the position of the support part. At this time, there are two symmetrically arranged fixing sheaths 11 inside the protective sheath 12. Then, through the setting of the fixing part, the protective sheath 12 can be fixed on the fixing sheath 11, and at the same time, the inner side of the protective sheath 12 is in contact with the support part, thereby reducing the possibility of damage to the protective sheath 12.

[0028] The above, such as Figures 6 to 8 As shown, the fixing part includes a clamp 13, an arcuate groove 14, an arcuate protrusion 15 and a first elastic ring 16. Two clamps 13 are symmetrically and detachably arranged on the two fixing sleeves 11. The protective sleeve 12 is located between the clamp 13 and the fixing sleeve 11. The inner side of the clamp 13 abuts against the protective sleeve 12. A plurality of arcuate grooves 14 are evenly spaced on the two fixing sleeves 11. The arcuate grooves 14 abut against the protective sleeve 12. A plurality of arcuate protrusions 15 are evenly and fixedly installed inside the clamp 13. The arcuate protrusions 15 are adapted to the arcuate grooves 14. The arcuate protrusions 15 abut against the protective sleeve 12. A first elastic ring 16 is tensioned between the two clamps 13 outside the two fixing sleeves 11.

[0029] Specifically, when the protective sleeve 12 is moved to the installation position, there are two fixing sleeves 11 on the inner side of the protective sleeve 12, and then the clamps 13 are installed on the outside of the two corresponding fixing sleeves 11 respectively through the setting of the clamps 13. At this time, the arc-shaped protrusion 15 at the bottom of the clamps 13 corresponds to the arc-shaped groove 14 on the outer side of the fixing sleeve 11. At this time, the protective sleeve 12 is pressurized to produce a wavy deformation under the cooperation of the arc-shaped groove 14 and the arc-shaped protrusion 15, thereby improving the waterproof performance. When the clamps 13 are installed, the first elastic ring 16 is put on the corresponding two clamps 13 to fix the position of the protective sleeve 12, thereby further protecting the connection position of the cable conductor 1.

[0030] The above, such as Fig. 9 As shown, the support portion includes a support frame 17 and a support groove 18. The support frame 17 is arranged between multiple heat shrink sleeves 10. The outer side of the support frame 17 abuts against the inner side of the protective sleeve 12. The support frame 17 is provided with multiple support grooves 18 at equal angles in a circular shape. The multiple support grooves 18 correspond one-to-one to the multiple heat shrink sleeves 10, and the support grooves 18 abut against the heat shrink sleeves 10.

[0031] Specifically, after the cable conductors 1 are docked, the support frame 17 is placed between multiple heat shrink sleeves 10, and the multiple heat shrink sleeves 10 are inserted into the support grooves 18 at corresponding positions, thereby separating the positions of each terminal 9, ensuring electrical isolation between each terminal 9, reducing the possibility of short circuit, and reducing interference between multiple cable conductors 1 when transmitting electricity.

[0032] like Figures 11 to 13 As shown, both ends of the first waterproof sheath 5 are fixedly installed with terminal waterproof components for waterproofing. The terminal waterproof components include a clamping frame 19 and a rubber sleeve 20. Two clamping frames 19 are symmetrically arranged at one end where the two cable bodies are connected. Every two adjacent clamping frames 19 are detachably connected. A rubber sleeve 20 is fixedly installed inside each clamping frame 19. The positions of the rubber sleeve 20 and the clamping frame 19 are offset and arranged. A second elastic ring 21 is also included, wherein the rubber sleeves 20 in every two mating clamping frames 19 are adapted, and one end of the rubber sleeve 20 away from the supporting frame 17 abuts against the second waterproof sheath 7, and the other end of the rubber sleeve 20 abuts against the protective sleeve 12. A second elastic ring 21 is tensioned between the two adapted clamping frames 19.

[0033] Specifically, the cable body is a key component in the photovoltaic power generation system, and its performance directly affects the efficiency and safety of the entire system. In order to ensure the efficient operation and protection of the cable conductor 1, a shielding layer 6 is usually added to its design. Since the cable conductor 1 is usually composed of multiple strands of wires twisted together, the conductor surface is not smooth, which easily forms an electric field concentration, resulting in local discharge. The shielding layer 6 can be at the same potential as the shielded conductor, thereby improving the electric field distribution and extending the service life of the cable. However, in the process of laying the cable body, the butt end of the cable is exposed to the air or humid environment for a long time. At this time, water vapor will gradually penetrate into the shielding layer 6. Since the first waterproof sheath 5 and the second waterproof sheath 7 are usually made of non-polar hydrophobic materials such as polyethylene, under the action of the alternating electric field Under the condition that water molecules can penetrate into the tiny gaps in the insulating material, resulting in a decrease in the insulation performance, it is necessary to waterproof the shielding layer 6. After the protective sleeve 12 is installed, a clamping frame 19 is installed at the junction of the second waterproof layer and the first waterproof layer of the two cable bodies. Rubber sleeves 20 are arranged on the inner sides of the two clamping frames 19. The rubber sleeves 20 are offset at a certain angle with the center position of the clamping frame 19 as the center, so that one end of the inner side of one clamping frame 19 can contact the inner side of the opposite clamping frame 19, thereby improving the waterproof performance. Then the second elastic ring 21 is tensioned and sleeved on the two corresponding clamping frames 19, and the inner side of one end of the rubber sleeve 20 abuts against the second waterproof sleeve 7, while the inner side of the other end of the rubber sleeve abuts against the edge of the protective sleeve 12, thereby increasing the waterproof performance of the shielding layer.

[0034] like Fig.14 As shown, a shell 8 is detachably and symmetrically installed between the two second waterproof sheaths 7, and a gap waterproof component is arranged inside the two shells 8 to prevent external water from entering the inside of the shell 8. The gap waterproof component includes a fixing ring 22, an upper sealing strip 23, a lower sealing strip 24 and a sealing portion. A fixing ring 22 is arranged at one end where the two second waterproof sheaths 7 are connected to each other, and the inner sides of the two shells 8 are respectively abutted against the two fixing rings 22. An upper sealing strip 23 is arranged between the two second waterproof sheaths 7 and the shell 8, and a lower sealing strip 24 is arranged at the lower part of the two upper sealing strips 23. The lower sealing strip 24 is adapted to the upper sealing strip 23, and the lower sealing strip 24 is located between the second waterproof sheath 7 and the shell 8. A sealing portion is installed on the upper sealing strip 23 and the lower sealing strip 24 for sealing.

[0035] Specifically, after installing the clamping frame 19, the outer shell 8 can be installed in a suitable position. At this time, an upper sealing strip 23 and a lower sealing strip 24 are set on the second waterproof cover 7, and one end of the upper sealing strip 23 and the lower sealing strip 24 are in contact with the fixing ring 22. Then, the two outer shells 8 are symmetrically installed between the two fixing rings 22, and the inner side of the outer shell 8 is abutted against the fixing ring 22. At this time, the two sides of the outer shell 8 are respectively abutted against the corresponding upper sealing strip 23 and the lower sealing strip 24. At this time, the sealing part is deformed, so as to facilitate sealing the gap between the outer shell 8 and the second waterproof cover 7.

[0036] The above, such as Fig.14 As shown, the sealing portion includes convex strips 25, and multiple convex strips 25 are evenly arranged on the inner and outer sides of the two upper sealing strips 23 and the inner and outer sides of the two lower sealing strips 24, wherein the convex strips 25 on the outer sides of the upper sealing strips 23 and the lower sealing strips 24 abut against the inner side of the outer shell 8, and the convex strips 25 on the inner sides of the upper sealing strips 23 and the lower sealing strips 24 abut against the second waterproof sheath 7, and also include slots 26 and insert strips 27, multiple slots 26 are evenly arranged at both ends of the two lower sealing strips 24, and multiple insert strips 27 are evenly arranged at both ends of the two upper sealing strips 23, and the multiple insert strips 27 correspond one-to-one to the multiple slots 26.

[0037] Specifically, when installing the upper sealing strip 23 and the lower sealing strip 24, first place the adapted upper sealing strip 23 and the lower sealing strip 24 on the corresponding position of the second waterproof sheath 7, so that the insert 27 of the upper sealing strip 23 corresponds to the slot 26 of the lower sealing strip 24, and through the cooperation of the insert 27 and the slot 26, the upper sealing strip 23 and the lower sealing strip 24 are connected together, and the outer shell 8 can be installed. The inner sides of the two ends of the outer shell 8 abut against the convex strips 25 on the outer sides of the upper sealing strip 23 and the lower sealing strip 24, and the second waterproof sheath 7 also abuts against the convex strips 25 on the inner sides of the upper sealing strip 23 and the lower sealing strip 24. After the outer shell 8 is installed, the convex strips 25 are deformed, thereby facilitating waterproofing.

[0038] In summary, in the process of laying photovoltaic cables, when two photovoltaic cables need to be butt-jointed, firstly, the ends of the two cable bodies that need to be butt-jointed are broken and processed to expose the cable conductor 1 and the insulating layer 2, and then the multiple insulating layers 2 are broken and processed to expose the cable conductor 1, and then the corresponding multiple cable conductors 1 are matched one by one, and a heat shrink sheath 10 is first put on each two cable conductors 1 that need to be butt-jointed, and the protective sheath 12 is put on the second waterproof sheath 7, and then the corresponding multiple cable conductors 1 are connected together using the wiring terminal 9, and then the heat shrink sheath The sleeve 10 is moved to the corresponding terminal 9 and the position is determined to be appropriate. The heat shrink sleeve 10 is evenly heated using a heat source such as a hot air gun or a hair dryer. During the heating process, the temperature should be evenly distributed to avoid local overheating and material damage. At this time, the heat shrink sleeve 10 shrinks radially, and the internal hot melt adhesive layer melts, so that the heat shrink sleeve 10 can be tightly wrapped around the surface of the terminal 9, and the inner sides of both ends of the heat shrink sleeve 10 also overlap with the corresponding insulating layer 2 to form a solid protective layer, thereby protecting the cable conductor 1 from water intrusion.

[0039] Then, the second waterproof sheath 7 and the shielding layer 6 of the cable body are dismantled to expose the second waterproof sheath 7, and then waterproof glue is applied to the inside of the fixing sleeve 11, and the fixing sleeve 11 is mounted on the corresponding end of the first waterproof sheath 5. After the waterproof glue is dry and the cable conductor 1 is docked, the support frame 17 is placed between the multiple heat shrinkable sleeves 10, and the multiple heat shrinkable sleeves 10 are inserted into the support grooves 18 at the corresponding positions, so as to separate the position of each terminal 9 and support the heat shrinkable sleeves 10 to ensure electrical isolation between each terminal 9, reduce the possibility of short circuit, and reduce interference between multiple cable conductors 1 when transmitting electricity.

[0040] Then the protective sleeve 12 is moved to the position of the support frame 17. At this time, there are two symmetrically arranged fixing sleeves 11 inside the protective sleeve 12. Then, through the setting of the clamp 13, the clamp 13 is installed on the outside of the two corresponding fixing sleeves 11 respectively. At this time, the arc-shaped protrusion 15 at the bottom of the clamp 13 corresponds to the arc-shaped groove 14 on the outside of the fixing sleeve 11. At this time, the protective sleeve 12 is pressurized to produce a wavy deformation under the cooperation of the arc groove 14 and the arc-shaped protrusion 15, thereby improving the waterproof performance. When the clamp 13 is installed, the first elastic ring 16 is put on the corresponding two clamps 13 to fix the position of the protective sleeve 12, thereby further protecting the connection position of the cable conductor 1 and reducing the possibility of damage to the protective sleeve 12.

[0041] In order to further improve the waterproof property of the cable body, it is also necessary to waterproof the shielding layer 6 of the cable body. After installing the protective sleeve 12, a clamping frame 19 is installed at the junction of the second waterproof layer and the first waterproof layer of the two cable bodies. Rubber sleeves 20 are arranged on the inner sides of the two clamping frames 19. The rubber sleeves 20 are offset at a certain angle with the center position of the clamping frame 19 as the center, so that one end of the inner side of one clamping frame 19 can contact the inner side of the opposite clamping frame 19, thereby improving the waterproof property. Then the second elastic ring 21 is tensioned and sleeved on the two corresponding clamping frames 19. The inner side of one end of the rubber sleeve 20 abuts against the second waterproof sheath 7, and the inner side of the other end of the rubber sleeve abuts against the edge of the protective sleeve 12, thereby increasing the waterproof property and preventing external water vapor from invading the shielding layer 6 of the cable body.

[0042] Finally, the shell 8 is installed. At this time, an upper sealing strip 23 and a lower sealing strip 24 are set on the second waterproof cover 7. At this time, the adapted upper sealing strip 23 and the lower sealing strip 24 are first placed on the corresponding positions of the second waterproof cover 7, so that the inserting strip 27 of the upper sealing strip 23 corresponds to the slot 26 of the lower sealing strip 24, and the upper sealing strip 23 and the lower sealing strip 24 are butted together through the cooperation of the inserting strip 27 and the slot 26, and the shell 8 can be installed. The inner sides of the two ends of the shell 8 are in contact with the convex strips 25 on the outer sides of the upper sealing strip 23 and the lower sealing strip 24, and the second waterproof cover 7 is also in contact with the convex strips 25 on the inner sides of the upper sealing strip 23 and the lower sealing strip 24. After the shell 8 is installed, the convex strip 25 is deformed, so that it is convenient to seal the gap between the shell 8 and the second waterproof cover 7, which greatly improves the waterproof performance.

[0043] The above are only preferred embodiments of the present invention and are 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 waterproof cable for photovoltaic power generation, comprising a cable body, wherein a plurality of cable conductors (1) are arranged in the cable body, each of the cable conductors (1) is coated with an insulating layer (2), a plurality of the insulating layers (2) are coated with a filling layer (3), the filling layer (3) is coated with a tape layer (4), the tape layer (4) is coated with a first waterproof sheath (5), and the first waterproof sheath (5) is coated with a shielding layer (6), characterized in that: Also includes: A second waterproof sheath (7), the shielding layer (6) being coated with the second waterproof sheath (7); A butt-jointed conductive component, wherein the butt-jointed conductive component is installed between the plurality of cable conductors (1) in two of the cable bodies and is used for transmitting electric power; A docking protection component, the docking protection component is installed outside the docking protection component and is used to protect the connection between the plurality of cable conductors (1); End waterproof components, both ends of the first waterproof sheath (5) are fixedly mounted with the end waterproof components for waterproofing; An outer shell (8), wherein the outer shell (8) is detachably and symmetrically mounted between the two second waterproof sheaths (7); A gap waterproof component is provided inside the two shells (8) to prevent external water from entering the inside of the shells (8).

2. The waterproof cable for photovoltaic power generation according to claim 1, characterized in that: The butt-jointed conductive assembly comprises: A wiring terminal (9), the wiring terminal (9) being fixedly installed between the plurality of cable conductors (1) in two of the cable bodies; A heat shrinkable sheath (10), wherein each of the wiring terminals (9) is covered with the heat shrinkable sheath (10), and the inner side of the heat shrinkable sheath (10) is in contact with the insulating layer (2).

3. The waterproof cable for photovoltaic power generation according to claim 2, characterized in that: The docking protection component comprises: A fixing sleeve (11), wherein one end of the two cable bodies connected to each other is provided with the fixing sleeve (11), and the fixing sleeve (11) is fixedly connected to the first waterproof sheath (5); A protective sleeve (12), the protective sleeve (12) being sleeved between the two fixing sleeves (11), and the plurality of heat shrink sleeves (10) being located inside the protective sleeve (12); a fixing portion, the fixing portion being mounted on the protective sleeve (12) and being used to fix the relative position of the protective sleeve (12) and the fixing sleeve (11); A support portion, the support portion being installed inside the protective sleeve (12) and being used to support the protective sleeve (12).

4. The waterproof cable for photovoltaic power generation according to claim 3, characterized in that: The fixing portion comprises: A clamp (13), wherein the two fixing sleeves (11) are symmetrically and detachably provided with two clamps (13), the protective sleeve (12) is located between the clamp (13) and the fixing sleeve (11), and the inner side of the clamp (13) abuts against the protective sleeve (12); Arc-shaped grooves (14), a plurality of the arc-shaped grooves (14) are evenly spaced on the two fixing sleeves (11), and the arc-shaped grooves (14) abut against the protective sleeves (12); Arc-shaped protrusions (15), a plurality of the arc-shaped protrusions (15) are fixedly installed at equal distances inside the clamp (13), the arc-shaped protrusions (15) are adapted to the arc-shaped grooves (14), and the arc-shaped protrusions (15) are in contact with the protective sleeve (12); A first elastic ring (16) is provided between the two clamps (13) outside the two fixing sleeves (11).

5. The waterproof cable for photovoltaic power generation according to claim 4, characterized in that: The support portion comprises: A support frame (17), the support frame (17) being arranged between the plurality of heat shrinkable sleeves (10), the outer side of the support frame (17) being in contact with the inner side of the protective sleeve (12); Support grooves (18), a plurality of the support grooves (18) are provided on the support frame (17) at equal angles in a circumferential shape, the plurality of the support grooves (18) correspond one-to-one to the plurality of the heat shrinkable sleeves (10), and the support grooves (18) abut against the heat shrinkable sleeves (10).

6. The waterproof cable for photovoltaic power generation according to claim 5, characterized in that: The terminal waterproof assembly comprises: A snap-in frame (19), wherein two snap-in frames (19) are symmetrically arranged at one end of the two cable bodies where they are butted, and each two adjacent snap-in frames (19) are detachably connected; A rubber sleeve (20) is fixedly mounted inside each of the clamping frames (19), and the rubber sleeve (20) and the clamping frame (19) are arranged in an offset manner.

7. The waterproof cable for photovoltaic power generation according to claim 6, characterized in that: Also includes: Wherein, the rubber sleeves (20) in every two matched clamping frames (19) are adapted, one end of the rubber sleeve (20) away from the support frame (17) abuts against the second waterproof protective sleeve (7), and the other end of the rubber sleeve (20) abuts against the protective sleeve (12); A second elastic ring (21) is tensionedly sleeved between the two adapted clamping frames (19).

8. The waterproof cable for photovoltaic power generation according to claim 7, characterized in that: The gap waterproofing assembly comprises: A fixing ring (22), wherein the butted ends of the two second waterproof sheaths (7) are each provided with the fixing ring (22), and the inner sides of the two outer shells (8) are respectively in contact with the two fixing rings (22); An upper sealing strip (23), wherein the upper sealing strip (23) is provided between each of the two second waterproof sheaths (7) and the outer shell (8); A lower sealing strip (24), the lower portion of the two upper sealing strips (23) being provided with the lower sealing strip (24), the lower sealing strip (24) being adapted to the upper sealing strips (23), and the lower sealing strip (24) being located between the second waterproof sheath (7) and the outer shell (8); A sealing portion is installed on both the upper sealing strip (23) and the lower sealing strip (24) for sealing.

9. The waterproof cable for photovoltaic power generation according to claim 8, characterized in that: The sealing portion comprises: Raised strips (25), a plurality of raised strips (25) being arranged at equal distances on the inner and outer sides of the two upper sealing strips (23) and the inner and outer sides of the two lower sealing strips (24); The convex strips (25) on the outer sides of the upper sealing strip (23) and the lower sealing strip (24) abut against the inner side of the outer shell (8), and the convex strips (25) on the inner sides of the upper sealing strip (23) and the lower sealing strip (24) abut against the second waterproof sheath (7).

10. The waterproof cable for photovoltaic power generation according to claim 9, characterized in that: Also includes: Slots (26), a plurality of slots (26) being provided at equal distances on both ends of the two lower sealing strips (24); Insertion strips (27), a plurality of the insertion strips (27) are arranged at equal distances at both ends of the two upper sealing strips (23), and the plurality of the insertion strips (27) correspond one-to-one to the plurality of the slots (26).

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