Photovoltaic lightning protection device

Abstract

The application discloses a photovoltaic lightning protection device and a special plugging assembly for the photovoltaic lightning protection device. The special plugging assembly for the photovoltaic lightning protection device comprises a fixing ring, a connecting ring, a supporting ring and a sealing plate. The connecting ring is slidably arranged on the top of the fixing ring. The connecting ring is composed of two identical connecting half rings. The outer edge radius of the connecting ring is slightly smaller than the outer edge radius of the fixing ring. A plurality of connecting rings are arranged along the axial direction of the connecting ring. The outer edge radius of the connecting ring gradually decreases. The top of the topmost connecting ring is slidably provided with the supporting ring. The gradually decreasing design of the radii of the connecting ring and the supporting ring enables the sealing plate and the supporting ring to form an elliptical plugging opening when a thick cable is inserted, and the plugging effect inside the photovoltaic lightning protection device is good.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic lightning protection technology, and in particular to a photovoltaic lightning protection device. Background Technology

[0002] In solar photovoltaic (PV) power generation systems, combiner boxes are used to reduce the wiring between solar PV arrays and inverters. Based on years of experience in lightning protection system design, various types of open-type combiner boxes have been developed. Users can connect a certain number of identical PV cells in series to form PV arrays, and then connect several PV arrays in parallel to the PV combiner box. After current is collected in the PV combiner box, it is connected to a controller, DC distribution cabinet, PV inverter, and AC distribution cabinet to form a complete PV power generation system, enabling grid connection. To improve system reliability and practicality, the PV combiner box is equipped with a dedicated DC lightning protection module, DC fuses, and circuit breakers, allowing users to accurately monitor the operating status of the PV cells and ensure the PV power generation system operates at its maximum efficiency.

[0003] Chinese invention patent CN110048672A discloses an intelligent photovoltaic lightning protection combiner box, including a box body. Two sets of two rows and five columns of secondary wiring pipes are symmetrically arranged on the bottom surface of the box body, with a rectangular strip between each two rows of secondary wiring pipes. The rectangular strip is welded to the bottom surface of the box body. Five integrated rotating rods are evenly arranged on the bottom surface of the rectangular strip, and connecting strips are sleeved on the surface of the rotating rods. An integrated cap is provided at the top of the connecting strip, and the cap is snapped onto the bottom end surface of one of the secondary wiring pipes. By setting the cap, the bottom end of some idle secondary wiring pipes can be sealed, thereby improving the overall airtightness of the box body and preventing foreign objects from entering the box body through the secondary wiring pipes. Furthermore, placing the cap between two rows of secondary wiring pipes effectively saves on the cost of setting the cap.

[0004] When the photovoltaic lightning protection combiner box needs to seal the wiring pipes, the cover needs to be moved to seal the bottom of the wiring pipes, thus preventing foreign objects from entering the box through the wiring pipes. However, the cover needs to be moved manually to seal it. If the cover is forgotten to be moved, foreign objects will enter the box through the wiring pipes, damaging the electrical components inside the box and making it inconvenient to use.

[0005] Therefore, it is necessary to provide a photovoltaic lightning protection device to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide a photovoltaic lightning protection device to solve the problem in the prior art that existing photovoltaic lightning protection devices cannot automatically close when no cables are connected to the wiring conduit.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a special sealing component for photovoltaic lightning protection devices, comprising: retaining ring, Connecting ring, Support ring, Sealing plate, A limiting unit is provided to restrict the sliding direction of the connecting ring and the support ring. The connecting ring is slidably disposed at the top of the fixed ring, and the center of the fixed ring and the center of the connecting ring are located on the same axis. The connecting ring is composed of two identical connecting half-rings, and the outer edge radius of the connecting ring is slightly smaller than the outer edge radius of the fixing ring. Multiple connecting rings are arranged along the axial direction of the connecting ring, and the outer edge radius of the connecting rings decreases sequentially. The top of the topmost connecting ring is slidably provided with the support ring.

[0008] Furthermore, the outer edge radius of the support ring is slightly smaller than the outer edge radius of the topmost connecting ring. The support ring is composed of two identical support half-rings, and the sealing plate is rotatably mounted on the top of the support ring. The sealing plate is composed of two identical semi-circular plates.

[0009] Furthermore, the dedicated blocking component for photovoltaic lightning protection devices also includes: Sliding sealing sheet splicing panels, The splicing plate is fixedly installed on the side wall of the support ring, and the sealing plate is rotatably installed on the top of the splicing plate. Sliding sealing plates are fixedly installed between the two connecting half-rings at the same horizontal height and between the opposite side walls of the two support half-rings. The sliding sealing plates move and abut against each other. The fixed ring and the connecting ring, the connecting ring and the connecting ring, and the connecting ring and the support ring are all slidably connected by limiting units.

[0010] Furthermore, the limiting unit includes: Slide key, Limit key, Limiting spring, The bottom of the sliding key is fixedly connected to the limiting key, the cross-sectional area of ​​the limiting key is larger than the cross-sectional area of ​​the sliding key, and the limiting spring is fixedly installed on the side wall of the sliding key.

[0011] Furthermore, the dedicated blocking component for photovoltaic lightning protection devices also includes: Board, Fixed plate, Slide, Limiting groove, The abutment plate is fixedly installed at the top of both the fixing ring and the connecting ring. The fixing plate is fixedly installed on the bottom of the inner sidewall of both the fixing ring and the connecting ring. The top of both the fixing ring and the connecting ring is provided with the sliding groove. The inner sidewalls of both the fixing ring and the connecting ring are provided with limiting grooves that communicate with the sliding groove. The abutment plate, the fixing plate, the sliding groove, and the limiting groove are all located at one end away from the axis of the fixing ring.

[0012] Furthermore, the sliding key is adapted to slide within the groove. The limiting key slides and adapts to the limiting groove. The limiting spring is fixedly installed between the abutment plate and the sliding key.

[0013] Furthermore, the bottom of the connecting ring is fixedly connected to the sliding key at the position corresponding to the sliding groove. The top end of the fixing plate is slidably adapted to the bottom end of the connecting ring and the bottom end of the support ring, respectively. The end of the abutment near the axis of the fixed ring is slidably adapted to the side wall of the connecting ring and the side wall of the support ring.

[0014] A photovoltaic lightning protection device includes a photovoltaic lightning protection combiner box. A wiring mechanism is provided at the bottom of the photovoltaic lightning protection combiner box. The wiring mechanism includes a wiring tube, which is fixedly installed at the bottom of the photovoltaic lightning protection combiner box and is connected to it. A sealing ball is provided at the top of the wiring tube, and a wiring hole is provided on the sealing ball. The sealing ball rotatably engages with the wiring tube. The device also includes a dedicated sealing component for the photovoltaic lightning protection device.

[0015] Furthermore, the bottom end of the threading tube is provided with a sealing plate, and the threading tube is provided with a transmission mechanism. When the sealing plate is driven by the support ring to close the bottom opening of the threading tube, the threading hole on the sealing ball is not connected to the threading tube. When the sealing plate is driven by the support ring to move toward the sealing ball, the sealing plate drives the sealing ball to rotate through the transmission mechanism, so that the threading hole on the sealing ball is connected to the threading tube. The sealing plate is rotatably mounted on the top of the splicing plate through a hinge. The top of the support ring is provided with a drive groove, and a spring is fixedly installed in the drive groove. The top end of the spring is fixedly connected to the sealing plate. The two sealing plates are symmetrically arranged with the axis of the support tube as the center of symmetry. Sealing strips are fixedly installed on the opposite side walls of the two sealing plates, and the two sealing strips move against each other.

[0016] Furthermore, the cable conduit includes an outer cylinder and an inner cylinder. The top end of the outer cylinder is fixedly connected to the bottom wall of the photovoltaic lightning protection combiner box. The inner cylinder is fixedly installed inside the outer cylinder. The bottom of the inner cylinder is provided with a sealing port. The bottom inner wall of the sealing port protrudes into the sealing port to form a flange. The top of the flange is fixedly installed with the fixing ring. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a three-dimensional structural schematic diagram of the photovoltaic lightning protection device of the present invention; Figure 2 This is a side view of the photovoltaic lightning protection device of the present invention. Figure 3 This is a schematic diagram of the main cross-sectional structure of the photovoltaic lightning protection device of the present invention; Figure 4 This is a cross-sectional structural schematic diagram of the wiring mechanism of the photovoltaic lightning protection device of the present invention; Figure 5 yes Figure 4 A magnified structural diagram at point A; Figure 6 yes Figure 4 A schematic diagram of the enlarged mechanism at point B; Figure 7 This is a schematic diagram of the installation structure of the sealing ball and the support cylinder of the present invention; Figure 8 This is a cross-sectional structural diagram of the cylinder block of the present invention; Figure 9 This is a three-dimensional structural schematic diagram of the sealing ball of the present invention; Figure 10 This is a side view of the sealing ball structure of the present invention; Figure 11 This is a three-dimensional structural schematic diagram of the special sealing component for the photovoltaic lightning protection device of the present invention; Figure 12 This is a top view of the special sealing component for the photovoltaic lightning protection device of the present invention; Figure 13 This is a schematic diagram showing the positional relationship between the special sealing component and the threading mechanism of the photovoltaic lightning protection device of the present invention; Figure 14 This is the present invention. Figure 13 Enlarged diagram at point X; Figure 15 This is a schematic diagram of the connecting ring in the special sealing assembly for photovoltaic lightning protection device of the present invention; Figure 16 This is a side view of the special sealing component for the photovoltaic lightning protection device of the present invention.

[0019] In the diagram: 1. Photovoltaic lightning protection combiner box; 2. Outer cylinder; 3. Inner cylinder; 4. Sealing port; 401. Flange; 5. Support cylinder; 6. Sealing ball; 7. Sealing plate; 8. Traction rope; 9. Pin shaft; 10. Rope pulley; 11. Torsion spring; 12. Spring; 13. Sealing ring; 14. Sealing strip; 15. Hinge; 16. Sealing bladder; 17. Gas pipe; 18. Cylinder body; 19. Piston; 20. Plug rod; 21. Connecting rope; 31. Fixing ring; 32. Connecting ring; 33. Supporting ring; 34. Sliding sealing plate; 35. Splicing plate; 41. Support plate; 42. Fixing plate; 51. Sliding key; 52. Limit key; 53. Limiting spring. Detailed Implementation Example 1

[0020] like Figures 1 to 6 As shown, a photovoltaic lightning protection device includes a photovoltaic lightning protection combiner box 1. A wire threading mechanism is provided at the bottom of the photovoltaic lightning protection combiner box 1. The wire threading mechanism includes a wire threading cylinder, which is fixedly installed at the bottom end of the photovoltaic lightning protection combiner box 1 and is connected to the photovoltaic lightning protection combiner box 1. A sealing ball 6 is provided at the top end of the wire threading cylinder, and a wire threading hole is opened on the sealing ball 6. The sealing ball 6 rotatably engages with the wire threading cylinder. A sealing plate 7 is provided at the bottom end of the wire threading cylinder. The cylinder is equipped with a transmission mechanism. When the sealing plate 7 closes the bottom opening of the threading cylinder, the threading hole on the sealing ball 6 is not connected to the threading cylinder. When the sealing plate 7 moves toward the sealing ball 6, the sealing plate 7 drives the sealing ball 6 to rotate through the transmission mechanism, so that the threading hole on the sealing ball 6 is connected to the threading cylinder. The outer wall of the sealing ball 6 is tightly fitted with the top wall of the threading cylinder. The top wall of the threading cylinder is provided with an arc-shaped edge that fits with the sealing ball 6, thereby increasing the contact area between the sealing ball 6 and the threading cylinder, thereby improving the sealing performance at the fit.

[0021] In practical use, the cable is threaded through the bottom wall of the photovoltaic lightning protection combiner box 1 using a cable threading tube, allowing the cable to be electrically connected to the electrical components inside the box. During threading, the top of the cable pushes open the sealing plate 7, causing it to move towards the sealing ball 6. As the sealing plate 7 moves towards the sealing ball 6, it drives the sealing ball 6 to rotate via a transmission mechanism, connecting the threading hole on the sealing ball 6 with the cable threading tube. This allows the top of the cable to pass through the hole and enter the photovoltaic lightning protection combiner box 1. When there is no cable in the cable threading tube, the threading hole in the sealing ball 6 is horizontal, preventing it from connecting with the tube and thus sealing the top of the tube. Simultaneously, the sealing plate 7 is also closed, sealing the bottom of the tube. This ensures the sealing of the cable threading tube, preventing dust from entering the photovoltaic lightning protection combiner box 1 and avoiding the problem of dust adhering to electrical components, which can lead to poor heat dissipation. Furthermore, the opening and closing of the cable threading tube does not require manual operation, making it convenient to use.

[0022] like Figures 3 to 10As shown, the cable reel includes an outer cylinder 2 and an inner cylinder 3. The top of the outer cylinder 2 is fixedly connected to the bottom wall of the photovoltaic lightning protection combiner box 1. The inner cylinder 3 is fixedly installed inside the outer cylinder 2. The outer cylinder 2 protects the inner cylinder 3, preventing the holes in the inner cylinder 3 from communicating with the outside world and avoiding the entry of external dust. The bottom of the inner cylinder 3 is provided with a sealing port 4. The inner diameter of the sealing port 4 gradually decreases from bottom to top, making the opening between the two sealing plates 7 larger, which facilitates the insertion of cables into the sealing port 4. There are two sealing plates 7, which are semi-circular. When combined into a circle, the two sealing plates 7 completely seal the bottom of the sealing opening 4. Both sealing plates 7 are rotatably mounted on the bottom of the inner cavity of the sealing opening 4. The threading mechanism also includes a support cylinder 5, which is fixedly mounted on the top of the threading cylinder. Two pins 9 are fixedly mounted on the outer wall of the sealing ball 6, symmetrically arranged with the center of the sealing ball 6 as the center of symmetry. The sealing ball 6 is rotatably mounted inside the support cylinder 5 via the pins 9. The bottom inner wall of the sealing opening 4 protrudes inward to form a flange 401. A groove is formed at the top of the flange 401, and a spring 12 is fixedly mounted inside the groove. The spring 12 is in a stretched state, with its top end fixedly connected to the sealing plate 7. A sealing ring 13 is fixedly installed on the top end of the flange 401, sealing the gap between the sealing plate 7 and the flange 401 to prevent dust from entering the inner cylinder 3 through the gap. The transmission mechanism includes a rope wheel 10 and a traction rope 8. The rope wheel 10 is fixedly installed on the end of the pin 9 away from the sealing ball 6. The rope wheel 10 is located inside the support cylinder 5. A torsion spring 11 is fitted on the pin 9. The torsion spring 11 allows the pin 9 to rotate under force and return to its original position when the external force is removed. One end of the traction rope 8 is fixedly connected to the top wall of the sealing plate 7, and the other end of the traction rope 8 passes through the side wall of the sealing port 4, the bottom wall of the photovoltaic lightning protection combiner box 1 and the bottom wall of the support cylinder 5 in sequence and is fixedly connected to the rope wheel 10. The sealing plate 7 is rotatably installed at the bottom of the inner cavity of the sealing port 4 through the hinge 15, and the two sealing plates 7 are symmetrically arranged with the axis of the support cylinder 5 as the center of symmetry. The opposite side walls of the two sealing plates 7 are fixedly installed with sealing strips 14. The two sealing strips 14 move against each other and seal the abutting position of the two sealing plates 7 through the sealing strips 14 to prevent dust from entering the inner cylinder 3 from the gap between the two sealing plates 7.

[0023] In practical use, when threading the cable, insert it from below the sealing opening 4. The top of the cable pushes open the sealing plate 7, causing the sealing plate 7 to move towards the sealing ball 6. As the sealing plate 7 moves towards the sealing ball 6, the traction rope 8 gradually loosens. Under the action of the torsion spring 11, the pin 9 rotates, thereby driving the winding wheel 10 to rotate. This causes the top of the traction rope 8 to gradually be wound around the winding wheel 10. At the same time, the pin 9 drives the sealing ball 6 to rotate, connecting the threading hole on the sealing ball 6 with the inner cylinder 3. This allows the top of the cable to pass through the threading hole and extend into the photovoltaic lightning protection combiner box 1, thus securing the cable. After being pulled out of the inner cylinder 3, the sealing plate 7 rotates downward under the action of the spring 12 and abuts against the flange 401, thereby sealing the bottom of the sealing port 4. At the same time, when the sealing plate rotates downward, it pulls the traction rope 8. The top of the traction rope 8 pulls the rope wheel 10 to rotate in the opposite direction, thereby releasing the traction rope 8. When the rope wheel 10 rotates in the opposite direction, it drives the pin 9 to rotate in the opposite direction, thereby driving the sealing ball 6 to rotate in the opposite direction, so that the wire hole on the sealing ball 6 is not connected to the inner cylinder 3, thereby sealing the top of the inner cylinder 3, ensuring the sealing of the wire tube, and preventing dust from entering the photovoltaic lightning protection combiner box 1.

[0024] like Figures 4 to 8 As shown, a sealing bladder 16 is fixedly installed inside the sealing ball 6. The sealing bladder 16 is annular, and a circular hole for cable to pass through is provided in the middle of the sealing bladder 16. The sealing bladder 16 and the cable hole are coaxially arranged. A cavity is provided between the outer cylinder 2 and the inner cylinder 3. A cylinder 18 is fixedly installed in the cavity. A piston 19 is slidably installed in the inner cavity of the cylinder 18. A stopper rod 20 is fixedly installed at the top of the piston 19. A connecting rope 21 is fixedly connected to the top of the stopper rod 20. The end of the connecting rope 21 away from the stopper rod 20 is fixedly connected to the traction rope 8. An air supply pipe 17 is connected to the bottom of the cylinder 18. The end of the air supply pipe 17 away from the cylinder 18 passes through the bottom wall of the photovoltaic lightning protection combiner box 1 and the outer wall of the sealing ball 6 in sequence and is connected to the sealing bladder 16.

[0025] In practical use, the sealing bladder 16 can seal the gap between the cable and the sealing ball 6. Due to the difference in cable diameter, when the cable diameter is large, it is difficult for the cable to pass through the sealing bladder 16. Therefore, when the cable is inserted into the inner cylinder 3, the cable will open the sealing plate 7, the sealing plate 7 will rotate upward, the traction rope 8 will move upward, and when the traction rope 8 moves upward, it will drive the stopper rod 20 to move upward through the connecting rope 21. When the stopper rod 20 moves upward, it will drive the piston 19 to move upward, so that the gas in the sealing bladder 16 enters the cylinder 18 through the gas supply pipe 17, thereby increasing the diameter of the through hole in the middle of the sealing bladder 16. The larger the diameter of the cable, the greater the angle of rotation of the sealing plate 7, the greater the upward distance of the traction rope 8, and the greater the upward distance of the piston 19 driven by the stopper rod 20 through the connecting rope 21. The more gas is input into the cylinder 18 through the gas supply pipe 17, the larger the diameter of the through hole in the middle of the sealing bladder 16, which makes it easier for thicker cables to pass through the through hole.

[0026] Working principle: When threading the cable, insert it from below the sealing port 4. The top of the cable pushes open the sealing plate 7, causing it to move towards the sealing ball 6. As the sealing plate 7 moves towards the sealing ball 6, the traction rope 8 gradually loosens. Under the action of the torsion spring 11, the pin 9 rotates, thereby driving the winding wheel 10 to rotate. This causes the top of the traction rope 8 to gradually wrap around the winding wheel 10. At the same time, the pin 9 drives the sealing ball 6 to rotate, connecting the threading hole on the sealing ball 6 with the inner cylinder 3, thus allowing the top of the cable to pass through. The wire hole extends into the photovoltaic lightning protection combiner box 1. After the cable is pulled out from the inner cylinder 3, the sealing plate 7 rotates downward under the action of the spring 12 and abuts against the flange 401, thereby sealing the bottom of the sealing port 4. At the same time, when the sealing plate rotates downward, it pulls the traction rope 8. The top of the traction rope 8 pulls the rope wheel 10 to rotate in the opposite direction, thereby releasing the traction rope 8. When the rope wheel 10 rotates in the opposite direction, it drives the pin 9 to rotate in the opposite direction, thereby driving the sealing ball 6 to rotate in the opposite direction, so that the wire hole on the sealing ball 6 is not connected to the inner cylinder 3, thus making the inner cylinder... The top of the inner cylinder 3 is sealed to ensure the airtightness of the cable conduit and prevent dust from entering the photovoltaic lightning protection combiner box 1. The sealing bladder 16 can seal the gap between the cable and the sealing ball 6. Due to the difference in cable diameter, when the cable diameter is large, it is difficult for the cable to pass through the sealing bladder 16. Therefore, when the cable is inserted into the inner cylinder 3, the cable will open the sealing plate 7, the sealing plate 7 will rotate upward, and the traction rope 8 will move upward. When the traction rope 8 moves upward, it will drive the stopper rod 20 to move upward through the connecting rope 21. When the stopper rod 20 moves upward, it will drive the piston 19 to move upward, so that the gas in the sealing bladder 16 will enter the cylinder 18 through the gas supply pipe 17. This will increase the diameter of the through hole in the middle of the sealing bladder 16. The larger the diameter of the cable, the greater the angle of rotation of the sealing plate 7, the greater the upward distance of the traction rope 8, and the greater the upward distance of the piston 19 driven by the stopper rod 20 through the connecting rope 21. The more gas is input into the cylinder 18 through the gas supply pipe 17, the larger the diameter of the through hole in the middle of the sealing bladder 16, which makes it easier for thicker cables to pass through the through hole. Example 2

[0027] A special sealing assembly for photovoltaic lightning protection devices includes: a fixed ring 31, a connecting ring 32, a support ring 33, a sealing plate 7, and a limiting unit. The limiting unit is used to restrict the sliding direction of the connecting ring 32 and the support ring 33. The connecting ring 32 is slidably disposed on the top of the fixed ring 31. The center of the fixed ring 31 and the center of the connecting ring 32 are located on the same axis. The connecting ring 32 is composed of two identical connecting half-rings, and the outer edge radius of the connecting ring 32 is slightly smaller than the outer edge radius of the fixed ring 31. Multiple connecting rings 32 are arranged along the axial direction of the connecting ring, and the outer edge radius of the connecting rings 32 decreases sequentially. The support ring 33 is slidably disposed on the top of the topmost connecting ring 32.

[0028] As a further embodiment of the present invention, the outer edge radius of the support ring 33 is slightly smaller than the outer edge radius of the topmost connecting ring 32. The support ring 33 is composed of two identical support semi-rings. The top of the support ring 33 is rotatably provided with the sealing plate 7, which is composed of two identical semi-circular plates.

[0029] As a further embodiment of the present invention, the photovoltaic lightning protection device special sealing assembly further includes: a sliding sealing plate 34 splicing plate 35, the splicing plate 35 is fixedly installed on the side wall of the support ring 33, the sealing plate 7 is rotatably installed on the top of the splicing plate 35, the sliding sealing plate 34 is fixedly installed between the two connecting half rings at the same horizontal height and between the opposite side walls of the two supporting half rings, the sliding sealing plate 34 moves against each other, and the fixed ring 31 and the connecting ring 32, the connecting ring 32 and the connecting ring 32, and the connecting ring 32 and the support ring 7 are all slidably connected by a limiting unit.

[0030] As a further embodiment of the present invention, the limiting unit includes: a sliding key 51, a limiting key 52, and a limiting spring 53. The bottom of the sliding key 51 is fixedly connected to the limiting key 52, the cross-sectional area of ​​the limiting key 52 is larger than the cross-sectional area of ​​the sliding key 51, and the limiting spring 53 is fixedly installed on the side wall of the sliding key 51.

[0031] As a further embodiment of the present invention, the photovoltaic lightning protection device special sealing assembly further includes: abutment plate 41, fixing plate 42, sliding groove, and limiting groove. The abutment plate 41 is fixedly installed on the top of both the fixing ring 41 and the connecting ring 32. The fixing plate 42 is fixedly installed on the bottom of the inner sidewall of both the fixing ring 31 and the connecting ring 32. The sliding groove is opened on the top of both the fixing ring 31 and the connecting ring 32. The limiting groove communicating with the sliding groove is opened on the inner sidewall of both the fixing ring 31 and the connecting ring 32. The abutment plate 41, the fixing plate 41, the sliding groove, and the limiting groove are all located at one end away from the axis of the fixing ring 41.

[0032] As a further embodiment of the present invention, the sliding key 51 is slidably adapted to the sliding groove, the limiting key 52 is slidably adapted to the limiting groove, and the limiting spring 53 is fixedly installed between the abutment plate 41 and the sliding key 51.

[0033] As a further embodiment of the present invention, the bottom of the connecting ring 32 is fixedly connected with the sliding key 51 at the position corresponding to the sliding groove, the top of the fixing plate 42 is slidably adapted to the bottom end of the connecting ring 32 and the bottom end of the support ring 33, and the end of the abutment plate 41 near the axis of the fixing ring 31 is slidably adapted to the side wall of the connecting ring 32 and the side wall of the support ring 33.

[0034] A photovoltaic lightning protection device includes a photovoltaic lightning protection combiner box. A wiring mechanism is provided at the bottom of the photovoltaic lightning protection combiner box. The wiring mechanism includes a wiring tube, which is fixedly installed at the bottom of the photovoltaic lightning protection combiner box and is connected to it. A sealing ball 6 is provided at the top of the wiring tube, and a wiring hole is provided on the sealing ball 6. The sealing ball 6 rotatably engages with the wiring tube. The device also includes a special sealing component for the photovoltaic lightning protection device.

[0035] As a further embodiment of the present invention, the bottom end of the threading tube is provided with the sealing plate 7, and the threading tube is provided with a transmission mechanism. When the sealing plate 7 is driven by the support ring 33 to close the bottom opening of the threading tube, the threading hole on the sealing ball 6 is not connected to the threading tube. When the sealing plate 7 is driven by the support ring 33 to move toward the sealing ball 6, the sealing plate 7 drives the sealing ball 6 to rotate through the transmission mechanism, so that the threading hole on the sealing ball 6 is connected to the threading tube. The sealing plate 7 is rotatably mounted on the top of the splicing plate 35 by a hinge. The top of the support ring 33 is provided with a drive groove, and a spring 12 is fixedly installed in the drive groove. The top end of the spring 12 is fixedly connected to the sealing plate 7. The two sealing plates 7 are symmetrically arranged with the axis of the support tube 5 as the center of symmetry. Sealing strips 14 are fixedly installed on the opposite sidewalls of the two sealing plates 7, and the two sealing strips 14 move against each other.

[0036] As a further embodiment of the present invention, the cable conduit includes an outer cylinder 2 and an inner cylinder 3. The top end of the outer cylinder 2 is fixedly connected to the bottom wall of the photovoltaic lightning protection combiner box. The inner cylinder 3 is fixedly installed inside the outer cylinder 2. A sealing port is provided at the bottom of the inner cylinder 3. The bottom inner wall of the sealing port protrudes into the sealing port to form a flange 401. The fixing ring 31 is fixedly installed on the top of the flange 401.

[0037] In Example 1, the greater the rotation angle of the sealing plate 7, the greater the upward movement distance of the traction rope 8, the greater the upward movement distance of the connecting rope 21 via the stopper rod 20 driving the piston 19, the more gas is input into the cylinder 18 through the air supply pipe 17 of the sealing bladder 16, and the larger the diameter of the through hole in the middle of the sealing bladder 16, making it easier for thicker cables to pass through the through hole. At this time, because the cable is thick, the side of the sealing plate 7 closest to the cable cannot always be in close contact with the side wall of the cable, causing the sealing strip 14 on the sealing plate 7 to form a rectangular opening. Since the cross-section of the cable is circular, the rectangular opening will leave a large gap, allowing dust to enter the inner cylinder 3, resulting in poor sealing effect of the sealing plate 7 when the device is working.

[0038] Compared to Example 1: In this example, the sliding cooperation of the fixing ring 31, connecting ring 32, and supporting ring 33 allows for the sealing of the inner cylinder 3 by the rotation of the sealing plate 7 when a thinner cable is inserted. When a thicker cable is inserted, the connecting ring 32 and supporting ring 33 move synchronously towards the outer edge of the fixing ring 31, thereby causing the sealing plate 7 to move synchronously away from both sides. The gradually decreasing radius of the connecting ring 32 and supporting ring 33 allows the sealing plate 7 and supporting ring 33 to form an elliptical sealing opening when the cable is inserted, making it difficult for dust or other debris to enter the photovoltaic lightning protection device. This prevents foreign objects from entering the box through the wiring pipe, which could damage the electrical components inside the box and cause inconvenience. At the same time, the sealing plate 7 is kept in a normally closed state by the cooperation of the limiting spring 53 and the limiting component, which provides a better sealing effect inside the photovoltaic lightning protection device. Furthermore, the normally closed state of the sealing plate 7 achieved by the cooperation of the limiting spring 53 and the limiting component enables automatic sealing without manual operation. The structure is ingenious and the operation is simple.

Claims

1. A photovoltaic lightning protection device, comprising a photovoltaic lightning protection combiner box, characterized in that: The bottom of the photovoltaic lightning protection combiner box is equipped with a wiring mechanism. The wiring mechanism includes a wire threading cylinder, which is fixedly installed at the bottom of the photovoltaic lightning protection combiner box. The conduit tube is connected to the photovoltaic lightning protection combiner box, and a sealing ball is provided at the top of the conduit tube. The sealing ball has a wire-passing hole, and the sealing ball rotatably engages with the wire-passing cylinder. It also includes a special sealing component for photovoltaic lightning protection devices, which comprises: retaining ring, Connecting ring, Support ring, Sealing plate, A limiting unit is provided to restrict the sliding direction of the connecting ring and the support ring. The connecting ring is slidably disposed at the top of the fixed ring, and the center of the fixed ring and the center of the connecting ring are located on the same axis. The connecting ring is composed of two identical connecting half-rings, and the outer edge radius of the connecting ring is slightly smaller than the outer edge radius of the fixing ring. Multiple connecting rings are arranged along the axial direction of the connecting ring, and the outer edge radius of the connecting rings decreases sequentially. The top of the topmost connecting ring is slidably provided with the support ring.

2. A photovoltaic lightning protection device according to claim 1, characterized in that: The outer edge radius of the support ring is slightly smaller than the outer edge radius of the topmost connecting ring. The support ring is composed of two identical support half-rings, and the sealing plate is rotatably mounted on the top of the support ring. The sealing plate is composed of two identical semi-circular plates.

3. A photovoltaic lightning protection device according to claim 2, characterized in that: The photovoltaic lightning protection device special sealing component also includes: Sliding sealing sheet splicing panels, The splicing plate is fixedly installed on the side wall of the support ring, and the sealing plate is rotatably installed on the top of the splicing plate. Sliding sealing plates are fixedly installed between the two connecting half-rings at the same horizontal height and between the opposite side walls of the two support half-rings. The sliding sealing plates move and abut against each other. The fixed ring and the connecting ring, the connecting ring and the connecting ring, and the connecting ring and the support ring are all slidably connected by limiting units.

4. A photovoltaic lightning protection device according to claim 3, characterized in that: The limiting unit includes: Slide key, Limit key, Limiting spring, The bottom of the sliding key is fixedly connected to the limiting key, the cross-sectional area of ​​the limiting key is larger than the cross-sectional area of ​​the sliding key, and the limiting spring is fixedly installed on the side wall of the sliding key.

5. A photovoltaic lightning protection device according to claim 4, characterized in that: The photovoltaic lightning protection device special sealing component also includes: Board, Fixed plate, Slide, Limiting groove, The abutment plate is fixedly installed at the top of both the fixing ring and the connecting ring. The fixing plate is fixedly installed on the bottom of the inner sidewall of both the fixing ring and the connecting ring. The top of both the fixing ring and the connecting ring is provided with the sliding groove. The inner sidewalls of both the fixing ring and the connecting ring are provided with limiting grooves that communicate with the sliding groove. The abutment plate, the fixing plate, the sliding groove, and the limiting groove are all located at one end away from the axis of the fixing ring.

6. A photovoltaic lightning protection device according to claim 5, characterized in that: The sliding key is adapted to slide along the groove. The limiting key slides into the limiting groove. The limiting spring is fixedly installed between the abutment plate and the sliding key.

7. A photovoltaic lightning protection device according to claim 6, characterized in that: The bottom of the connecting ring is fixedly connected to the sliding key at the position corresponding to the sliding groove. The top end of the fixing plate is slidably adapted to the bottom end of the connecting ring and the bottom end of the support ring, respectively. The end of the abutment near the axis of the fixed ring is slidably adapted to the side wall of the connecting ring and the side wall of the support ring.

8. The photovoltaic lightning protection device according to claim 7, characterized in that: The bottom end of the threading spool is provided with the sealing plate, and the threading spool is provided with a transmission mechanism. When the sealing plate is driven by the support ring to close the bottom opening of the threading tube, the threading hole on the sealing ball is not connected to the threading tube. When the sealing plate is driven by the support ring to move towards the sealing ball, the sealing plate drives the sealing ball to rotate through the transmission mechanism, so that the threading hole on the sealing ball is connected to the threading tube. The sealing plate is hinged and rotatably mounted on the top of the splicing plate. A drive groove is provided on the top of the support ring, and a spring is fixedly installed within the drive groove. The top end of the spring is fixedly connected to the sealing plate. The two sealing plates are symmetrically arranged with the axis of the support cylinder as the center of symmetry. Sealing strips are fixedly installed on the opposite sidewalls of the two sealing plates, and the two sealing strips move and abut against each other.

9. The photovoltaic lightning protection device according to claim 8, characterized in that: The threading spool includes an outer spool and an inner spool. The top of the outer cylinder is fixedly connected to the bottom wall of the photovoltaic lightning protection combiner box. The inner cylinder is fixedly installed inside the outer cylinder. The bottom of the inner cylinder is provided with a sealing port. The bottom inner wall of the sealing opening protrudes inward to form a flange. The retaining ring is fixedly installed on the top of the flange.

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