A method and device for improving the lightning receiving effect of the blade tip lightning arrester of a wind turbine generator

Abstract

The present invention discloses a method and device for improving the lightning receiving effect of the tip lightning arrester of a wind turbine, which relates to the field of tip lightning arresters. The method includes first using an angle grinder to polish the peeling or cracking parts of the tip lightning arrester, checking whether there is damage to the outer skin cloth layer of the rear housing of the lightning arrester, strengthening the tip lightning arrester, and repairing the topcoat of the tip lightning arrester. The device also includes a connecting sleeve, both ends of which are fixedly connected with fixing plates, and a driving motor is slidably connected to the middle part of the inner cavity of the connecting sleeve. Through a brand-new method for treating the tip lightning arrester, the present invention first polishes the peeling or cracking parts of the tip, then completely removes all sundries such as structural adhesives in the exposed airfoil area of the aluminum tip, ensuring that all aluminum materials are exposed, thereby ensuring the lightning receiving effect of the aluminum tip. Moreover, this method can also speed up the maintenance speed of the tip lightning arrester, strengthen the bearing capacity of the wind turbine blade, reduce the time for maintenance personnel to work at high altitudes, and reduce risks.

Description

Technical Field

[0001] The present invention relates to the technical field of tip lightning arresters, and particularly to a method and device for improving the lightning receiving effect of tip lightning arresters of wind turbines. Background Art

[0002] With the rapid development of the new energy industry, wind power generation dominates the new energy industry. Early wind turbines were generally located in mountainous areas with high altitudes. In wind farms in high-altitude mountainous areas, the positions of the wind turbines are very high. In high-altitude areas, there are also more lightning strikes. Since the wind turbines are generally located on the mountaintop and the blade height is the highest object in the vicinity, it is extremely easy to attract lightning. After being struck by lightning, the lightning arrester at the blade will directly introduce the lightning current into the ground. Since both the actual operation and test results show that the probability of the rear section of the blade being struck by lightning is extremely small, the lightning arrester of the blade focuses on protecting the tip to ensure that the tip position is not damaged by lightning strikes.

[0003] In the prior art, wind farms conduct lightning protection inspections on the blades every year. After the grounding resistance is qualified, it is considered that the blades can normally conduct the current into the ground when struck by lightning. However, sometimes the tip cracks or the blade lightning arrester is damaged, which all affect the lightning protection effect of the blades. Due to the old process of the tip lightning arrester of the wind turbine, the lightning receiving effect is not ideal when the blade is directly struck by lightning, resulting in faults such as tip cracking of the wind turbine blade. Moreover, the old process easily causes the wrapping cloth at the tip of the blade to peel, warp, and crack due to wind erosion. In addition, the maintenance of the wind turbine blade is an aerial operation with relatively high risks. Currently, when cleaning sundries such as structural adhesives in the exposed airfoil area of the aluminum tip, operations are all carried out by wiping or using a brush, resulting in an unsatisfactory cleaning effect on the surface of the aluminum tip, so that the aluminum material cannot be fully exposed, ultimately causing a decline in the lightning receiving effect of the lightning arrester. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings in the prior art that the old process easily causes the wrapping cloth at the tip of the blade to peel, warp, and crack due to wind erosion, and the cleaning effect on the surface of the aluminum tip cannot reach an ideal state, and to propose a method and device for improving the lightning receiving effect of tip lightning arresters of wind turbines.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A method for improving the lightning receiving effect of tip lightning arresters of wind turbines, the steps are as follows:

[0007] S1. First, use a grinding machine to polish the peeling or cracking part of the tip lightning arrester;

[0008] S2. Check whether there is damage to the outer skin cloth layer of the rear housing of the lightning arrester;

[0009] S3. Carry out reinforcement treatment on the tip lightning arrester;

[0010] S4. Repair the topcoat of the tip lightning arrester.

[0011] Preferably, first use a angle grinder to grind the peeling or cracking parts of the tip lightning arrester, specifically including:

[0012] Use a angle grinder to grind off the tip wrapping cloth layers on the windward and leeward sides of the tip lightning arrester, and at the same time extend the grinding 50 mm towards the blade root to remove the surface coating, so that the tip lightning arrester is completely exposed, and all sundries such as structural adhesive in the exposed airfoil area of the aluminum tip are completely removed.

[0013] Preferably, reinforce the tip lightning arrester, specifically including:

[0014] First, completely remove all sundries such as structural adhesive in the exposed airfoil area of the aluminum tip to ensure that all aluminum materials are exposed;

[0015] Then cut a groove along the cloth layer at the dovetail groove of the aluminum tip on the leeward and windward sides of the blade. The width of the groove is 5 ± 2 mm, and the depth is 3 ± 1 mm. Grind a slope with a width of 5 ± 2 mm at the cloth layer of the groove, and clean the inside of the groove to ensure that there are no sundries and burrs;

[0016] Immediately paste the wood grain paper tape annularly along both sides of the groove edge without skew;

[0017] Finally, paste the wood grain paper tape for isolation on the outside of the aluminum tip dovetail groove and on the leeward and windward sides, 20 ± 2 mm back from the dovetail groove cut-off position towards the blade root. Apply sealant in the isolation area, smooth it with a scraper, remove the excess sealant, and then tear off the tape. Note that the sealant is applied evenly, transitions smoothly with the profile, and the sealant shall not contaminate other areas of the blade.

[0018] Preferably, repair the topcoat of the tip lightning arrester, specifically including:

[0019] Stick the masking tape around the repair area, roll-paint with a wool stick, after removing the masking tape paper, roll the edge of the repair area with a roller to make the edge line blend;

[0020] After the roll-painting is completed, check the repair area to ensure that there are no pinholes, putty edges, exposed substrate, running paint, etc. on the surface of the repaired aluminum tip.

[0021] A device for improving the lightning receiving effect of the tip lightning arrester of a wind turbine, comprising:

[0022] Connecting sleeve, both ends of the connecting sleeve are fixedly connected with fixing disks. The side wall of the left fixing disk is fixedly connected with a water tank, and the side wall of the right fixing disk is fixedly connected with a cleaning agent tank. A driving motor is slidably connected to the middle part of the inner cavity of the connecting sleeve. Cross-shaped parts are fixed to both output ends of the driving motor. A cleaning shaft is rotatably connected to the side wall of the fixing disk. A cross-shaped card slot is opened at one end of the cleaning shaft close to the cross-shaped part, and the cross-shaped part is engaged with the cross-shaped card slot. A grip rod is fixedly connected to the side wall of the connecting sleeve;

[0023] Cleaning assembly, the cleaning assembly is fixedly connected to the end of the cleaning shaft away from the cross-shaped part, and the cleaning assembly is used for cleaning the exposed surface of the aluminum blade tip;

[0024] Preferably, the cleaning assembly includes a cleaning disk, the cleaning disk is fixedly connected to the end of the cleaning shaft away from the cross-shaped part, cleaning brushes are fixedly connected to the side wall of the cleaning disk, and through holes are opened on the side wall of the cleaning disk. An annular sliding groove is opened on the inner wall of the fixing disk, and a connecting rod is slidably connected inside the annular sliding groove. The connecting rod is fixedly connected to the side wall of the cleaning disk.

[0025] Preferably, a trigger groove is opened on one side of the fixing disk close to the connecting sleeve. A water inlet pipe and a water outlet pipe are respectively fixedly connected to the upper and lower parts of the side wall of the trigger groove, and the water inlet pipe and the water outlet pipe are aligned with each other. The water inlet pipes on both sides of the connecting sleeve are respectively communicated with the inner cavities of the water tank and the cleaning agent tank. A sealing block is slidably connected to the inner wall of the trigger groove. A spring is fixedly connected between the sealing block and the side wall of the trigger groove. An extrusion rod is fixedly connected to the other side of the sealing block.

[0026] Preferably, a trigger rod is fixedly connected to the side wall of the connecting rod. The trigger rod can slide in contact with the extrusion rod, and the contact ends of the trigger rod and the extrusion rod are both provided with arc-shaped rounded corners. A flow-through hole is opened in the sealing block, and the flow-through hole can be aligned with the water inlet pipe and the water outlet pipe.

[0027] Preferably, trigger switches are arranged on the upper and lower parts of the side wall of the grip rod, and the trigger switches are electrically connected to the driving motor. A storage battery is arranged inside the grip rod, and a charging slot is opened on one side of the storage battery. The storage battery is electrically connected to the driving motor.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] 1. Through a brand-new method for processing the tip lightning arrester of the present invention, first grind the peeling or cracking parts of the tip, and then completely remove all sundries such as structural glue in the exposed airfoil area of the aluminum blade tip to ensure that all aluminum materials are exposed, so as to ensure the lightning receiving effect of the aluminum blade tip. Moreover, through this method, the repair speed of the tip lightning arrester can be accelerated, and the bearing capacity of the fan blade can be strengthened; reduce the time for maintenance personnel to work at high altitude and reduce the risk.

[0030] 2. Through the cooperation among the cleaning disc, cleaning brush, trigger rod, extrusion rod, sealing block, water inlet pipe and water outlet pipe, during the rotation of the cleaning disc, the trigger rod and the extrusion rod will come into contact and slide against each other, thereby driving the sealing block to slide towards the side close to the spring, and finally connecting the water inlet pipe and the water outlet pipe, so that the degreasing agent or clear water is sprayed down to clean the stubborn coverings such as the structural glue on the tip surface of the blade that are difficult to clean, thus improving the cleaning effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the step flow of a method for improving the lightning receiving effect of the blade tip lightning arrester of a wind turbine proposed by the present invention;

[0032] Figure 2 It is a schematic diagram of the overall front view structure of a device for improving the lightning receiving effect of the blade tip lightning arrester of a wind turbine proposed by the present invention;

[0033] Figure 3 It is a schematic diagram of the half-sectional structure of a device for improving the lightning receiving effect of the blade tip lightning arrester of a wind turbine proposed by the present invention;

[0034] Figure 4 It is a device for improving the lightning receiving effect of the blade tip lightning arrester of a wind turbine proposed by the present invention Figure 3 and the enlarged structure schematic diagram of area A therein;

[0035] Figure 5 It is a schematic diagram of the side sectional structure of a device for improving the lightning receiving effect of the blade tip lightning arrester of a wind turbine proposed by the present invention;

[0036] Figure 6 It is a schematic diagram of the installation structure of the blade tip lightning arrester of a wind turbine proposed by the present invention.

[0037] In the figure: 1. Connecting sleeve; 2. Fixed disc; 21. Clear water tank; 22. Detergent tank; 3. Driving motor; 31. Cross-shaped fastener; 4. Cleaning shaft; 41. Cross-shaped card slot; 5. Holding rod; 51. Trigger switch; 6. Cleaning assembly; 61. Cleaning disc; 62. Cleaning brush; 63. Annular sliding groove; 64. Connecting rod; 641. Trigger rod; 7. Trigger groove; 71. Water inlet pipe; 72. Water outlet pipe; 73. Sealing block; 731. Through-flow hole; 74. Spring; 75. Extrusion rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0039] Refer toFigure 1 , Figure 6 , a method for improving the lightning protection effect of the blade tip lightning arrester of a wind turbine, the steps are as follows:

[0040] S1. First, use a grinding machine to polish the peeling or cracking parts of the blade tip lightning arrester, specifically including:

[0041] Use a grinding machine to polish and remove the blade tip wrapping cloth layer on the windward and leeward sides of the blade tip lightning arrester, and at the same time extend the polishing 50 mm towards the blade root to remove the surface coating, so that the blade tip lightning arrester is completely exposed, and all sundries such as structural glue in the exposed airfoil area of the aluminum blade tip are removed completely.

[0042] S2. Check whether there is damage to the outer skin cloth layer of the rear end housing of the lightning arrester;

[0043] S3. Carry out reinforcement treatment on the blade tip lightning arrester, specifically including:

[0044] First, remove all sundries such as structural glue in the exposed airfoil area of the aluminum blade tip to ensure that all aluminum materials are exposed;

[0045] Then cut a groove along the cloth layer at the dovetail groove of the aluminum blade tip on the leeward and windward sides. The width of the groove is 5 ± 2 mm, and the depth is 3 ± 1 mm. Grind a slope with a width of 5 ± 2 mm on the cloth layer at the groove, and clean the inside of the groove to ensure that there are no sundries and burrs;

[0046] Immediately paste wood grain paper tape around the edge of the groove, and it must not be skewed;

[0047] Finally, paste wood grain paper tape for isolation on the outside of the aluminum blade tip dovetail groove and on the leeward and windward sides, 20 ± 2 mm back from the dovetail groove cut-off position towards the blade root. Apply sealant in the isolation area, level it with a scraper, remove the excess sealant, and then tear off the tape. Note that the sealant is applied evenly, the transition with the profile is smooth, and the sealant must not contaminate other areas of the blade.

[0048] S4. Repair the topcoat of the blade tip lightning arrester, specifically including:

[0049] Stick masking tape around the repair area, roll-paint with a wool stick, after removing the masking tape paper, roll the edge of the repair area with a roller to make the edge line blend;

[0050] After the roll-painting is completed, check the repair area to ensure that there are no pinholes, putty edges, exposed bottoms, runs, etc. on the surface of the repaired aluminum blade tip.

[0051] Refer to Figure 2 , Figure 3 and Figure 5 , a device for improving the lightning protection effect of the blade tip lightning arrester of a wind turbine, including:

[0052] Connecting sleeve 1, with fixed disks 2 fixedly connected to both ends of the connecting sleeve 1. On the side wall of the left fixed disk 2, a water tank 21 is fixedly connected, and on the side wall of the right fixed disk 2, a cleaner tank 22 is fixedly connected. In the middle of the inner cavity of the connecting sleeve 1, a driving motor 3 is slidably connected. On both output ends of the driving motor 3, cross-shaped connectors 31 are fixed. On the side wall of the fixed disk 2, a cleaning shaft 4 is rotatably connected. At one end of the cleaning shaft 4 close to the cross-shaped connector 31, a cross-shaped slot 41 is opened, and the cross-shaped connector 31 is engaged with the cross-shaped slot 41. On the side wall of the connecting sleeve 1, a grip rod 5 is fixedly connected;

[0053] Cleaning assembly 6, fixedly connected to the end of the cleaning shaft 4 far from the cross-shaped connector 31, used to clean the exposed surface of the aluminum blade tip;

[0054] Refer to Figure 3 , wherein, the cleaning assembly 6 includes a cleaning disk 61, fixedly connected to the end of the cleaning shaft 4 far from the cross-shaped connector 31. On the side wall of the cleaning disk 61, cleaning brushes 62 are fixedly connected, and through holes are opened on the side wall of the cleaning disk 61. On the inner wall of the fixed disk 2, an annular sliding groove 63 is opened, and a connecting rod 64 is slidably connected inside the annular sliding groove 63. The connecting rod 64 is fixedly connected to the side wall of the cleaning disk 61;

[0055] Through the setting of the above structure, first, turn the side of the device with the cleaner tank 22 downward. Under the action of the self-weight of the driving motor 3, the cross-shaped connector 31 will be engaged with the cross-shaped slot 41. Then start the driving motor 3 to drive the cleaning shaft 4 to rotate, and then drive the cleaning disk 61 to rotate, so that the cleaning brushes 62 can clean sundries such as structural adhesives in the exposed airfoil area of the aluminum blade tip;

[0056] Refer to Figure 4 , wherein, on the side of the fixed disk 2 close to the connecting sleeve 1, a trigger groove 7 is opened. On the upper and lower parts of the side wall of the trigger groove 7, a water inlet pipe 71 and a water outlet pipe 72 are respectively fixedly connected, and the water inlet pipe 71 and the water outlet pipe 72 are aligned. The water inlet pipes 71 on both sides of the connecting sleeve 1 are respectively communicated with the inner cavities of the water tank 21 and the cleaner tank 22. A sealing block 73 is slidably connected to the inner wall of the trigger groove 7. A spring 74 is fixedly connected between the sealing block 73 and the side wall of the trigger groove 7. On the other side of the sealing block 73, an extrusion rod 75 is fixedly connected;

[0057] Refer to Figure 4 , wherein, a trigger rod 641 is fixedly connected to the side wall of the connecting rod 64. The trigger rod 641 can slide in contact with the extrusion rod 75, and the contact ends of the trigger rod 641 and the extrusion rod 75 are both provided with arc-shaped rounded corners. A through-flow hole 731 is opened inside the sealing block 73, and the through-flow hole 731 can be aligned with the water inlet pipe 71 and the water outlet pipe 72;

[0058] With the above structure, during the rotation of the cleaning disc 61, the connecting rod 64 will be driven to rotate synchronously, so that the trigger rod 641 will slide against the pressing rod 75. As a result, the pressing rod 75 will slide into the trigger groove 7, driving the sealing block 73 to slide towards the side close to the spring 74, and finally connecting the through-flow hole 731 with the water inlet pipe 71 and the water outlet pipe 72. Thus, the degumming agent in the cleaning agent tank 22 will be sprayed down, and finally flow through the cleaning brush 62 to the exposed area of the aluminum blade tip, cleaning the stubborn coverings such as structural adhesives on its surface that are difficult to clean. Along with the rotation of the cleaning brush 62, the stubborn coverings can be quickly and efficiently cleaned, improving the cleaning effect of the device. When the trigger rod 641 is disengaged from the pressing rod 75, under the rebounding action of the spring 74, the sealing block 73 will block the connection between the water inlet pipe 71 and the water outlet pipe 72, thus blocking the spraying of the degumming agent and improving the rationality of the device.

[0059] Immediately turn off the drive motor 3 and reset it to the initial state. Then, flip the device so that the side with the water tank 21 installed faces downwards. In the same way as above, this time, clean water flows out from the water outlet pipe 72 to clean the exposed area of the aluminum blade tip that was previously cleaned with the degumming agent. First, it can further improve the cleaning effect of the exposed area of the aluminum blade tip. Second, it can avoid the corrosion of the aluminum blade tip caused by the residue of the degumming agent, ensuring the service effect of the aluminum blade tip and thus improving the lightning protection effect of the device.

[0060] Refer to Figure 2 , in which, trigger switches 51 are arranged on both the upper and lower parts of the side wall of the grip rod 5, and the trigger switches 51 are electrically connected to the drive motor 3. A storage battery is arranged inside the grip rod 5, and a charging slot is provided on one side of the storage battery. The storage battery is electrically connected to the drive motor 3;

[0061] Refer to Figure 2-5, in the present invention, during the rotation of the cleaning disk 61, the connecting rod 64 will be synchronously driven to rotate, thereby causing the trigger rod 641 to slide against the pressing rod 75. Subsequently, the pressing rod 75 slides into the trigger groove 7, driving the sealing block 73 to slide towards the side close to the spring 74, and finally connecting the through-flow hole 731 with the water inlet pipe 71 and the water outlet pipe 72. As a result, the degumming agent in the cleaning agent tank 22 is sprayed down, and finally flows through the cleaning brush 62 to the exposed area of the aluminum blade tip, cleaning the stubborn coverings such as structural adhesives on its surface that are difficult to clean. Along with the rotation of the cleaning brush 62, the stubborn coverings can be quickly and efficiently cleaned. When the trigger rod 641 is disengaged from the pressing rod 75, under the elastic return of the spring 74, the sealing block 73 will block the connection between the water inlet pipe 71 and the water outlet pipe 72, thereby blocking the spraying of the degumming agent. Then, the device is flipped, and the side with the water tank 21 installed is turned downward. In the same way as above, this time, clean water flows out from the water outlet pipe 72 to clean the exposed area of the aluminum blade tip that was cleaned with the degumming agent in the previous step. Firstly, it can further improve the cleaning effect of the exposed area of the aluminum blade tip. Secondly, it can avoid the corrosion of the aluminum blade tip caused by the residue of the degumming agent, thus ensuring the service effect of the aluminum blade tip and improving the lightning protection effect of the device.

[0062] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A method for improving the lightning receiving effect of the blade tip lightning arrester of a wind turbine, characterized in that, The steps are as follows: First, use an angle grinder to polish the peeling or cracking parts of the tip lightning arrester; Check whether the outer skin cloth layer of the rear housing of the lightning arrester is damaged; Reinforce the tip lightning arrester; Repair the topcoat of the tip lightning arrester; The reinforcement treatment of the tip lightning arrester specifically includes: First, completely remove all the structural adhesives in the exposed airfoil area of the aluminum tip, ensuring that all the aluminum materials are exposed; Then, cut a groove along the cloth layer at the dovetail groove of the aluminum tip on the leeward and windward sides of the blade. The width of the groove is 5±2mm, and the depth is 3±1mm. Grind a slope with a width of 5±2mm at the cloth layer of the groove, and clean the inside of the groove to ensure that there are no sundries or burrs; Immediately paste the wood grain paper tape annularly along both sides of the groove edge without skewing; Finally, paste the wood grain paper tape for isolation on the outside of the aluminum tip dovetail groove, on the leeward and windward sides, and 20±2mm back from the dovetail groove cut-off position towards the blade root. Apply sealant in the isolation area, smooth it with a scraper, remove the excess sealant, and then tear off the tape. Note that the sealant should be evenly applied, smoothly transition with the profile, and the sealant should not contaminate other areas of the blade.

2. A method for improving the lightning capture effect of the blade tip lightning arrester of a wind turbine generator, characterized in that, The step of first using an angle grinder to polish the peeling or cracking parts of the tip lightning arrester specifically includes: Use an angle grinder to polish and remove the tip wrapping cloth layer on the windward and leeward sides of the tip lightning arrester, and at the same time extend the polishing 50mm towards the blade root to remove the surface coating, making the tip lightning arrester completely exposed, and completely remove all the structural adhesives in the exposed airfoil area of the aluminum tip.

3. A method for improving the lightning capture effect of the tip lightning arrester of a wind turbine generator, characterized in that, The repair of the topcoat of the tip lightning arrester specifically includes: Stick the masking tape around the repair area, roll-paint with a wool stick, after removing the masking tape paper, roll the edge of the repair area with a roller to make the edge line blend; After the roll-painting is completed, check the repair area to ensure that there are no pinholes, putty edges, exposed bottoms, or sags on the surface of the repaired aluminum tip.

Images