Fan lightning protection grounding system

Abstract

The invention provides a fan lightning protection grounding system, which belongs to the technical field of fan lightning protection, and comprises a fan body, and a downlead, a grounding plate and a plurality of grounding devices which are matched with the fan body, the down lead is mounted on the fan body and is led to the bottom of the fan body from the top of the fan body; the grounding plate is arranged at the bottom of the fan body in a surrounding manner; the plurality of grounding devices are circumferentially arranged on the grounding plate, each grounding device comprises a grounding rod and a pair of clamping plates, the pair of clamping plates sleeves the grounding rod, and a clamping gap is formed between the pair of clamping plates and is used for clamping the grounding plate; the grounding device further comprises a rebounding core and a pair of clamping half pipes, a counter bore is formed in one end of the grounding rod, the grounding device is convenient and fast to install and easy to use, and connection among the grounding rod, the downlead and the grounding plate can be completed only by 1-2 workers.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind turbine lightning protection, and particularly relates to a wind turbine lightning protection grounding system. Background Art

[0002] Wind turbine lightning protection refers to the systematic protection of the entire wind turbine. With the continuous increase in the single-unit capacity of wind turbines, the hub height and blade tip height of wind turbines are also increasing continuously. In open fields, mountaintops, and coastal areas, the probability of wind turbines being struck by lightning is very high. From the feedback of each wind farm, lightning strikes are not only an important factor causing wind turbine failure and shutdown, but also directly affect the safe operation of the wind farm. Generally, a lightning rod and supporting lightning protection devices are installed on the top of the wind turbine, led to the bottom of the wind turbine through a down conductor, and a grounding rod and a grounding plate are installed on the ground at the bottom of the wind turbine. The existing connection methods of the down conductor, grounding rod, and grounding plate are connected by welding, but the welding method has cumbersome processes, the welding points are prone to corrosion, resulting in an increase in resistance, and the welding is a rigid connection, which is prone to connection disconnection. Summary of the Invention

[0003] Based on this, the present invention provides a wind turbine lightning protection grounding system to solve the technical problems existing in the prior art, that is, the existing connection methods of the down conductor, grounding rod, and grounding plate are connected by welding, but the welding method has cumbersome processes, the welding points are prone to corrosion, resulting in an increase in resistance, and the welding is a rigid connection, which is prone to connection disconnection.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: A wind turbine lightning protection grounding system includes a wind turbine body and a down conductor, a grounding plate, and a plurality of grounding devices provided in a supporting manner with the wind turbine body; The down conductor is installed on the wind turbine body and is led from the top of the wind turbine body to the bottom of the wind turbine body; The grounding plate is disposed around the bottom of the wind turbine body; A plurality of the grounding devices are circumferentially arranged on the grounding plate. The grounding device includes a grounding rod and a pair of clamping plates. The pair of clamping plates are sleeved on the grounding rod, and there is a clamping gap between the pair of clamping plates for clamping the grounding plate; the grounding device further includes a resilient core and a pair of engaging half-tubes. One end of the grounding rod is provided with a counterbore, the resilient core is embedded in the counterbore, and the resilient core has a vertically upward resilient tendency. One end of the pair of engaging half-tubes is mutually clamped with the grounding rod. A clamping cavity is formed in the center of the pair of engaging half-tubes for clamping the down conductor, and the end of the down conductor is in contact with the grounding rod and the resilient core, and the resilient core is in a compressed state. The pair of engaging half-tubes can approach each other and lock.

[0005] Preferably, the resilient core includes a return spring and a core rod body. The return spring is arranged at the bottom of the counterbore, the core rod body is tightly nested in the counterbore, the core rod body is in contact with the return spring and is located above the return spring.

[0006] Preferably, the counterbore is provided with a fluted portion, the fluted portion is located on one side close to the end of the grounding rod, and the core rod body is provided with a pattern protrusion, and the pattern protrusion is adapted to the fluted portion.

[0007] Preferably, the resilient core further includes a temporary stop pin. A first locking hole is formed in the side wall of the grounding rod, and a second locking hole is formed in the core rod body. In the first state, the temporary stop pin passes through the second locking hole and extends into the first locking hole.

[0008] Preferably, an avoidance chute is further formed in the core rod body. In the second state, the temporary stop pin passes through the second locking hole and extends into the avoidance chute. The temporary stop pin is provided with a first take-off member and a second take-off member. The first take-off member is located on one side close to the avoidance chute, and the second take-off member is located on one side far from the avoidance chute.

[0009] Preferably, an arc-shaped protrusion is arranged on the inner wall of the end of the clamping half-tube, and a counterbore is formed in the side wall of the end of the grounding rod, and the arc-shaped protrusion is clamped in the counterbore.

[0010] Preferably, a first locking block is further arranged on the inner wall of the clamping half-tube, and the surface of the first locking block is in a tooth shape.

[0011] Preferably, a second locking block is further arranged on the inner wall of the clamping half-tube. The second locking block is connected to the first locking block and is located below the first locking block. The surface of the second locking block is flat, and the end face of the second locking block is lower than the end face of the first locking block.

[0012] Preferably, a limiting groove is arranged on the inner wall of the clamping half-tube, and the first locking block and the second locking block are detachably arranged in the limiting groove.

[0013] Preferably, a locking screw hole is formed through the side wall of the clamping half-tube, and the clamping half-tube is provided with a locking screw pin. The locking screw pin is screwed in the locking screw hole, and the locking screw pin has a tip and faces the surface of the down-conductor.

[0014] Compared with the prior art, the present invention has at least the following advantages: (1) The grounding device is convenient and fast to install and simple to use. Only 1-2 workers are required to complete the connection between the grounding rod, the down-conductor and the grounding plate.

[0015] (2) This grounding device does not require welding, saving the cumbersome welding process, avoiding the fatal defect that rigid connections are prone to disconnection, and is applicable to the connection between the downlead of tall equipment such as wind turbines and the grounding rod.

[0016] (3) This grounding device has a wide range of applications and is suitable for various terrains. For terrains with large temperature differences (plateaus, mountains, deserts, etc.), even if the metal expands and contracts due to thermal expansion and contraction between the grounding rod and the downlead, resulting in disconnection, but the rebound core is in a rebound state, and the rebound core will continuously connect with the downlead, always being in a connected state, avoiding the failure of the lightning protection function of the downlead and the grounding rod. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of a wind turbine lightning protection grounding system.

[0018] Figure 2 It is an assembly axonometric view of the downlead, grounding plate and grounding device.

[0019] Figure 3 It is the front view of the grounding device.

[0020] Figure 4 It is Figure 3 The A-A half-sectional view of

[0021] Figure 5 It is Figure 3 The enlarged partial view of the first state.

[0022] Figure 6 It is Figure 3 The enlarged partial view of the second state.

[0023] Figure 7 It is the left view of the grounding device.

[0024] Figure 8 It is Figure 7 The B-B half-sectional view of

[0025] Figure 9 It is the axonometric view of the grounding rod and the clamping plate.

[0026] Figure 10 It is the axonometric view of the core rod body.

[0027] Figure 11 It is the half-sectional view of the core rod body.

[0028] Figure 12 It is the axonometric view of the return spring.

[0029] Figure 13 It is the axonometric view of the engaging half-tube.

[0030] Figure 14 It is the axonometric view of the first locking block and the second locking block.

[0031] In the figure: fan body 10, downlead 20, earthing plate 30, earthing device 40, earth rod 100, counterbore 110, flower groove part 111, first locking hole 120, sunk groove 130, return spring core 200, return spring 210, core rod body 220, pattern protrusion 221, second locking hole 222, avoidance chute 223, temporary stop pin 230, first starting piece 231, second starting piece 232, clamping plate 300, first stud nut 310, engaging half pipe 400, second stud nut 410, arc protrusion 420, first locking block 430, second locking block 440, limiting groove 450, locking screw hole 460, locking screw pin 470. Specific embodiments

[0032] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The following will further describe the technical solutions of the present invention with reference to the drawings of the embodiments of the present invention. The present invention is not limited to the following specific embodiments.

[0033] It should be understood that the same or similar reference numerals in the drawings of the embodiments correspond to the same or similar components. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0034] Please refer to Figures 1 to 14 , a lightning protection and earthing system for a fan, comprising a fan body 10 and a downlead 20, an earthing plate 30 and a plurality of earthing devices 40 which are arranged in a supporting manner with the fan body 10; The downlead 20 is installed on the fan body 10 and is led from the top of the fan body 10 to the bottom of the fan body 10; the material of the downlead 20 is usually round steel, and its diameter should not be less than 8 mm. One end of the downlead 20 is connected to the lightning protection device at the top of the fan body 10 and extends vertically downward to the bottom.

[0035] The material of the earthing plate 30 is usually flat steel, and the earthing plate 30 is arranged around the bottom of the fan body 10; the main function of the earthing plate 30 is to shunt the lightning current of the downlead 20 and play a role in reducing the resistance.

[0036] A plurality of the grounding devices 40 are circumferentially arranged on the grounding plate 30, enabling lightning to quickly enter the ground and reducing the load on a single grounding device 40.

[0037] The grounding device includes a grounding rod 100, a resilient core 200, a pair of clamping plates 300, and a pair of engaging half-tubes 400.

[0038] The material of the grounding rod 100 is an existing grounding rod 100, such as a copper-plated steel grounding rod 100 or a galvanized steel grounding rod 100. The length of the grounding rod 100 can be selected as 1.5 m, 2 m, etc. A counterbore 110 is provided at one end of the grounding rod 100.

[0039] The resilient core 200 is embedded in the counterbore 110, that is, the outer wall of the resilient core 200 is in contact with the inner wall of the counterbore 110, achieving a good conductive effect. Moreover, the resilient core 200 has an upward resilient tendency. When the resilient core 200 is compressed, it is stressed and can move upward.

[0040] A pair of the clamping plates 300 are sleeved on the grounding rod 100, and there is a clamping gap between the pair of clamping plates 300. The width of the clamping gap is adapted to the thickness of the grounding plate 30 for clamping the grounding plate 30, enabling the grounding plate 30 to be in contact with the clamping plates 300, and the grounding plate 30 and the clamping plates 300 are relatively fixed.

[0041] One end of the engaging half-tube 400 is clamped to the grounding rod 100. The clamping method can be one of welded clamping, hook-loop clamping, pressure clamping, rivet clamping, and bolt clamping. A clamping cavity is formed in the center of the pair of engaging half-tubes 400. The diameter of the clamping cavity is adapted to the diameter of the down-conductor 20 for clamping the down-conductor 20. The end of the down-conductor 20 is in contact with the grounding rod 100 and the resilient core 200, and the resilient core 200 is in a compressed state. The pair of engaging half-tubes 400 can approach and lock with each other.

[0042] Further explanation: The grounding device 40 is a detachable structure. Only the grounding device 40 connected to the down conductor 20 is provided with the resilient core 200 and the engaging half tube 400. The down conductor is clamped by the engaging half tube 400 to keep the resilient core 200 in continuous contact with the down conductor. For the grounding device 40 not connected to the down conductor 20, the resilient core 200 and the engaging half tube 400 are not provided. Only a pair of clamping plates 300 are provided on the grounding rod 100. The grounding rod is an ordinary grounding rod, and the counterbore 110 does not need to be formed on the grounding rod 100. The pair of clamping plates 300 clamp the grounding plate 30, and the grounding rod 100 can be inserted into the ground.

[0043] Specific usage process: Install the down-conductor 20 on the fan body 10, lead it from the top of the fan body 10 to the bottom of the fan body 10, arrange the grounding plate 30 around the bottom of the fan body 10, dig a pit around the fan body 10, and vertically install the grounding rod 100 in the pit. For the grounding rod 100 directly below the down-conductor 20, use the grounding rod 100 provided with the counterbore 110, make the opening of the counterbore 110 face upward, and embed the resilient core 200 into the counterbore 110 (before installing the resilient core 200, a part of conductive liquid can be added into the counterbore 110). Since the resilient core 200 is in the original state (not compressed), the end of the resilient core 200 is higher than the end of the grounding rod 100. Install the engaging half-tube 400 at the end of the grounding rod 100, sleave the down-conductor 20 in the engaging cavity. When the down-conductor 20 moves downward or the grounding rod 100 moves upward, the resilient core 200 is squeezed to contract, and the resilient core 200 is completely contracted into the counterbore 110, that is, the upper end face of the resilient core 200 is flush with the upper end face of the grounding rod 100, and the end face of the down-conductor 20 is simultaneously in mutual contact with the end face of the resilient core 200 and the end face of the grounding rod 100. Subsequently, contract a pair of the engaging half-tubes 400 to make them approach each other and lock them to prevent the down-conductor 20 from moving in the engaging cavity. Furthermore, install the grounding plate 30 in the clamping gap between a pair of clamping plates 300 and fix it to make the clamping plates 300 in mutual contact with the grounding plate 30. And arrange ordinary grounding rods 100 (grounding rods without counterbores 110) around the grounding plate 30 in a circular and uniform manner, use the clamping plates 300 to clamp the grounding plate 30, thereby achieving the effect of fixing the grounding plate 30. Finally, fill the pit (a resistance reducing agent can be added into the pit) to complete the connection between the grounding rod 100, the down-conductor 20 and the grounding plate 30. The grounding device is convenient and fast to install and simple to use, and only 1-2 workers are needed to complete the connection between the grounding rod 100, the down-conductor 20 and the grounding plate 30. Secondly, the grounding device does not need welding, saving the cumbersome welding process and avoiding the fatal defect that the rigid connection is easy to break. Thirdly, the grounding device has a wide application range and is suitable for various terrains. For terrains with large temperature differences (plateaus, mountains, deserts, etc.), even if the grounding rod 100 and the down-conductor 20 are disconnected due to the thermal expansion and contraction characteristics of metals, but the resilient core 200 is in the resilient state, the resilient core 200 will continuously connect with the down-conductor 20 and be in a connected state at all times, avoiding the lightning protection function of the down-conductor 20 and the grounding rod 100 from failing.

[0044] In a possible embodiment, a number of raised blocks are evenly arranged on the grounding plate 30. When the clamping plate 300 clamps the grounding plate 30, it is located on one side of the raised blocks, and the raised blocks have the function of positioning and preventing offset of the clamping plate.

[0045] In a possible embodiment, refer to Figure 4 , Figure 8 , Figure 10 , Figure 11 and Figure 12 , the resilient core 200 includes a return spring 210 and a core rod body 220. The return spring 210 and the core rod body 220 can be integrally connected, or the return spring 210 and the core rod body 220 can be separately arranged. The return spring 210 is arranged at the bottom of the counterbore 110. When the return spring 210 is installed in the counterbore 110, a part of conductive liquid is added into the counterbore 110 to increase the conductivity of the return spring 210 and prevent the return spring 210 from being damaged by lightning current. The core rod body 220 is tightly nested in the counterbore 110, the core rod body 220 is in contact with the return spring 210 and is located above the return spring 210. When the return spring 210 is not compressed, the core rod body 220 is installed in the counterbore 110, and the upper end surface of the core rod body 220 is higher than the upper end surface of the grounding rod 100. When the return spring 210 is compressed, the upper end surface of the core rod body 220 can be flush with the upper end surface of the grounding rod 100. Since the core rod body 220 is tightly nested in the counterbore 110, the resistance between the core rod body 220 and the grounding rod 100 becomes smaller, which is more conducive to guiding lightning current.

[0046] Specifically, the material of the core rod body 220 is the same as that of the grounding rod 100, which is a galvanized steel rod or a copper-plated steel rod.

[0047] In a preferred embodiment, refer to Figure 10 , if the contact area between the core rod body 220 and the grounding rod 100 is small, it will cause the resistivity of the contact point between the core rod body 220 and the grounding rod 100 to be high. When the lightning current is too large, the core rod body 220 will be damaged and the lightning protection function will fail. Therefore, a flower groove part 111 is arranged in the counterbore 110. The flower groove part 111 is located on one side close to the end of the grounding rod 100. A pattern protrusion 221 is arranged on the core rod body 220. The pattern protrusion 221 is adapted to the flower groove part 111. By the mutual cooperation and contact of the flower groove part 111 and the pattern protrusion 221, the contact area between the core rod body 220 and the grounding rod 100 can be increased, the resistivity of the contact point between the core rod body 220 and the grounding rod 100 can be made lower, and the lightning current can be smoothly guided into the ground.

[0048] Specifically, the opening pattern of the flower trough portion 111 can be one of a plum blossom pattern or a tooth pattern.

[0049] In a possible embodiment, referring to Figure 4 and Figure 10 , when the resilient core 200 is in the initial position, the upper end surface of the core rod body 220 is higher than the upper end surface of the grounding rod 100. As a result, when installing the down conductor 20 in the engaging half tube 400, it requires the staff to push the resilient core 200 into a compressed state and also requires the staff to engage and guide the down conductor 20 through the engaging half tube 400. It requires the cooperation of two staff members for installation, and it is difficult for one staff member to install. Therefore, the resilient core 200 further includes a temporary stop pin 230. A first locking hole 120 is formed on the side wall of the grounding rod 100, and a second locking hole 222 is formed on the core rod body 220. In the first state, the temporary stop pin 230 passes through the second locking hole 222 and extends into the first locking hole 120. Specifically, the temporary stop pin 230 is a cylinder, the first locking hole 120 and the second locking hole 222 are circular holes, and the diameter of the temporary stop pin 230 is adapted to the diameters of the first locking hole 120 and the second locking hole 222. When installing the resilient core 200 in the counterbore 110, the staff presses the core rod body 220, and the return spring 210 is compressed and contracted. When the end surface of the core rod body 220 is flush with the end surface of the grounding rod 100, the first locking hole 120 and the second locking hole 222 are coaxial. The temporary stop pin 230 is passed through the second locking hole 222 and extends into the first locking hole 120 to temporarily stop the core rod body 220 from popping out of the counterbore 110, achieving the function of limiting the core rod body 220 and the return spring 210. Moreover, the end surface of the core rod body 220 is flush with the end surface of the grounding rod 100, facilitating the subsequent installation of the down conductor 20. It only needs to align the down conductor 20 with the end surface of the grounding rod 100. After installing and fixing the down conductor 20, the temporary stop pin 230 is pulled out, and the return spring 210 rebounds, pushing the core rod body 220 upward to keep the core rod body 220 in contact with the down conductor 20 at all times.

[0050] Specifically, to facilitate the coaxial alignment of the first locking hole 120 and the second locking hole 222, a first limit line is provided on the end surface of the grounding rod 100, and a second limit line is provided on the end surface of the core rod body 220. When the end surface of the core rod body 220 is flush with the end surface of the grounding rod 100 and the first limit line and the second limit line are aligned with each other, the first locking hole 120 and the second locking hole 222 are in a coaxial alignment state.

[0051] In a possible embodiment, referring to Figure 10 , there may be conductive liquid in the counterbore 110. To prevent the conductive liquid from volatilizing, and at the same time, to prevent soil from entering the second keyhole 222 along the first keyhole 120, so as to avoid hindering the movement of the mandrel body 220 in the counterbore 110. An avoidance chute 223 is further formed on the mandrel body 220. In the second state, the temporary stop pin 230 passes through the second keyhole 222 and extends into the avoidance chute 223. That is, when the temporary stop pin 230 is pulled out, the end of the temporary stop pin 230 exits from the first keyhole 120, and the end of the temporary stop pin 230 retreats into the avoidance chute 223. The return spring 210 pushes the mandrel body 220 to move, and the temporary stop pin 230 moves relatively in the avoidance chute 223, which will not hinder the movement of the mandrel body 220. The temporary stop pin 230 can prevent soil from entering the first keyhole 120, and at the same time, can slow down the volatilization of the conductive liquid.

[0052] Specifically, in order to prevent the temporary stop pin 230 from entering the second keyhole 222 again, a first take-off member 231 and a second take-off member 232 are arranged on the temporary stop pin 230. The first take-off member 231 is located on the side close to the avoidance chute 223, and the second take-off member 232 is located on the side far from the avoidance chute 223. During the initial installation, referring to Figure 5 , first press the first take-off member 231 to contract, and the temporary stop pin 230 enters the first keyhole 120. When the first take-off member 231 enters the counterbore 110, the first take-off member 231 rebounds and jumps up to prevent the temporary stop pin 230 from exiting the first keyhole 120. At this time, the second take-off member 232 is located outside the grounding rod 100. Continue to press the second take-off member 232 to push the temporary stop pin 230 to continue moving until the end of the temporary stop pin 230 enters the second keyhole 222; referring to Figure 6 , when the temporary stop pin 230 enters the avoidance chute 223, pull out the temporary stop pin 230, and the end of the temporary stop pin 230 is located in the avoidance chute 223. At this time, the first take-off member 231 is located at the inner wall of the counterbore 110, and the second take-off member 232 is located at the outer wall of the grounding rod 100. The temporary stop pin 230 is limited by the first take-off member 231 and the second take-off member 232 to prevent the temporary stop pin 230 from exiting the first keyhole 120.

[0053] Specifically, the first jumping member 231 is a spring contraction member, which belongs to an existing device. Specifically, the first jumping member 231 includes a spring and a blocking block. The spring is fixedly arranged in the temporary stop pin 230, and the blocking block is arranged at the end of the spring. When the blocking block is pressed, the spring contracts, and the spring and the blocking block contract into the temporary stop pin 230. When not under force, the spring rebounds, driving the blocking block to extend to the outer surface of the temporary stop pin 230. The structure of the second jumping member 232 is the same as that of the first jumping member 231.

[0054] In a possible embodiment, referring to Figure 2 , a number of groups of first stud nuts 310 are arranged on the clamping plate 300, and a pair of the clamping plates 300 are tightened through the first stud nuts 310. Generally, four groups of the first stud nuts 310 are provided. One of the clamping plates 300 is fixedly arranged on the side wall of the grounding rod 100, and the other clamping plate 300 is movably sleeved on the grounding rod 100. The grounding plate 30 is clamped between a pair of the clamping plates 300, and the grounding plate 30 is limited by the four groups of the first stud nuts 310. Then, the first stud nuts 310 are contracted to achieve the function of fixing and limiting the grounding plate 30.

[0055] Specifically, adjustable bolt holes are formed in the clamping plate 300, and the first stud nuts 310 can move in the adjustable bolt holes to adapt to the grounding plates 30 of different widths and clamp and fix the grounding plates 30.

[0056] In a possible embodiment, referring to Figure 2 , a number of groups of second stud nuts 410 are arranged on the snap - on half - tube 400, and a pair of the snap - on half - tubes 400 are tightened through the second stud nuts 410. A pair of the snap - on half - tubes 400 are connected by a bolt - type snap - connection method. Generally, four groups of the second stud nuts 410 are provided, which are respectively arranged at the upper end and the lower end of the snap - on half - tube 400. Using the second stud nuts 410 for snap - connection is convenient to use, the fastening is more reliable, and it is easier to find accessories for the second stud nuts 410, which is convenient for replacement.

[0057] Specifically, in order to ensure that the second stud nuts 410 are fastened more reliably, double - headed nuts are used for fixation.

[0058] In a possible embodiment, referring to Figure 13, an arc-shaped protrusion 420 is provided on the inner wall of the engaging half-tube 400 near the end, and a sunk groove 130 is formed on the side wall of the grounding rod 100 near the end. The arc-shaped protrusion 420 is clamped in the sunk groove 130. The height of the arc-shaped protrusion 420 is paired with the depth of the sunk groove 130. Clamping the arc-shaped protrusion 420 in the sunk groove 130 achieves the functions of limiting and fixing the two, making the connection between the engaging half-tube 400 and the grounding rod 100 more firm. At the same time, it can prevent the engaging half-tube 400 from moving up and down along the vertical direction of the grounding rod 100.

[0059] In a possible embodiment, refer to Figure 14 , a first locking block 430 is further provided on the inner wall of the engaging half-tube 400, and the surface of the first locking block 430 is tooth-shaped. When the engaging half-tubes 400 are locked together, the teeth on the surface of the first locking block 430 will tightly bite on the surface of the down-conductor 20, and the tooth part will penetrate into the surface of the down-conductor 20, thereby achieving the mutual clamping of the engaging half-tube 400 and the down-conductor 20, realizing the primary locking of the down-conductor 20 and the engaging half-tube 400, and preventing the end faces of the down-conductor 20, the grounding rod 100, and the spring-back core 200 from separating from each other.

[0060] In a preferred embodiment, a second locking block 440 is further provided on the inner wall of the engaging half-tube 400. The second locking block 440 is connected to the first locking block 430 and is integrally formed, and is located below the first locking block 430. The surface of the second locking block 440 is flat, and the end face of the second locking block 440 is lower than the end face of the first locking block 430. Specifically, the end face of the second locking block 440 is slightly lower than the end face of the first locking block 430. When the teeth of the first locking block 430 penetrate into the surface of the down-conductor 20, the second locking block 440 will tightly hold the down-conductor 20, increasing the contact area between the down-conductor 20 and the second locking block 440, realizing the secondary locking of the down-conductor 20 and the engaging half-tube 400, and preventing the down-conductor 20 from moving up and down along the vertical direction.

[0061] In a possible embodiment, the diameter of the down-conductor 20 is usually 8 mm or more. For a relatively thick down-conductor 20, the first locking block and the second locking block cannot lock the relatively thick down-conductor 20, and the first locking block and the second locking block with a thinner thickness need to be replaced. A limiting groove 450 is provided on the inner wall of the engaging half-tube 400. Refer to Figure 12, the first locking block 430 and the second locking block 440 are detachably arranged in the limiting groove 450. The outer walls of the first locking block 430 and the second locking block 440 are in mutual fit with the inner wall of the limiting groove 450, and the height of the first locking block 430 is adapted to the height of the second locking block 440, so that they can be tightly limited in the limiting groove 450 without deviation or mutual sliding. When the first locking block 430 and the second locking block 440 cannot engage the downlead 20, the original first locking block 430 and the second locking block 440 are removed from the limiting groove 450, and the first locking block 430 and the second locking block 440 of different sizes are replaced to make the first locking block 430 and the second locking block 440 match the downlead 20.

[0062] In a possible embodiment, refer to Figure 13 , to further fix the downlead 20, a locking screw hole 460 is penetrated through the side wall of the engaging half pipe 400. The engaging half pipe 400 is provided with a locking screw pin 470, and the locking screw pin 470 is screwed in the locking screw hole 460. The locking screw pin 470 has a tip and faces the surface of the downlead 20. When the end face of the downlead 20 is in contact with the end face of the grounding rod 100, after the first locking block 430 and the second locking block 440 are locked with the downlead 20, the locking screw is screwed. The locking screw rotates in the locking screw hole 460, so that the tip of the locking screw pin 470 approaches the surface of the downlead 20 and penetrates into the surface of the downlead 20, realizing the triple locking of the downlead 20 and preventing the end face of the downlead 20 from separating from the end face of the grounding rod 100 and the end face of the spring-back core 200.

[0063] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or variations can be made on the basis of the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A wind turbine lightning protection grounding system, characterized in that: It includes a fan body and a down conductor, a grounding plate and several grounding devices matched with the fan body; The down conductor is installed on the fan body and leads from the top of the fan body to the bottom of the fan body; The grounding plate is disposed around the bottom of the fan body; A plurality of grounding devices are circumferentially arranged on the grounding plate, the grounding device comprises a grounding rod and a pair of clamping plates, the pair of clamping plates are sleeved on the grounding rod, and there is a clamping gap between the pair of clamping plates for clamping the grounding plate; the grounding device also comprises a rebound core and a pair of locking half-tubes, a countersunk hole is opened at one end of the grounding rod, the rebound core is embedded in the countersunk hole, and the rebound core has a tendency to rebound vertically upward, one end of the locking half-tube is clamped with the grounding rod, and a locking cavity is formed in the center of the pair of locking half-tubes for clamping the down conductor, and the end of the down conductor is in contact with the grounding rod and the rebound core, and the rebound core is in a compressed state, and the pair of locking half-tubes can be close to each other and locked.

2. A wind turbine lightning protection and grounding system according to claim 1, characterized in that: The rebound core comprises a return spring and a core rod body, the return spring is arranged at the bottom of the countersunk hole, the core rod body is tightly nested in the countersunk hole, the core rod body and the return spring are in contact with each other and are located above the return spring.

3. A wind turbine lightning protection and grounding system as claimed in claim 2, characterized in that: The countersunk hole is provided with a flower groove portion, and the flower groove portion is located on a side close to the end of the ground rod. The core rod body is provided with a pattern protrusion, and the pattern protrusion is adapted to the flower groove portion.

4. A wind turbine lightning protection and grounding system as claimed in claim 2, characterized in that: The resilient core further comprises a temporary stop pin, a first locking hole is formed on the side wall of the ground rod, and a second locking hole is formed on the core rod body. In a first state, the temporary stop pin passes through the second locking hole and extends into the first locking hole.

5. A wind turbine lightning protection and grounding system as claimed in claim 4, characterized in that: An avoidance groove is also provided on the core rod body. In the second state, the temporary stop pin passes through the second lock hole and extends into the avoidance groove. A first jumping piece and a second jumping piece are provided on the temporary stop pin. The first jumping piece is located on a side close to the avoidance groove, and the second jumping piece is located on a side away from the avoidance groove.

6. A wind turbine lightning protection and grounding system according to claim 1, characterized in that: An arc-shaped protrusion is arranged on the inner wall of the end of the engaging half-tube, and a recessed groove is arranged on the side wall of the end of the grounding rod, and the arc-shaped protrusion is engaged in the recessed groove.

7. A wind turbine lightning protection and grounding system as claimed in claim 6, characterized in that: The inner wall of the engaging half-tube is also provided with a first locking block, and the surface of the first locking block is tooth-shaped.

8. A wind turbine lightning protection and grounding system as claimed in claim 7, characterized in that: A second locking block is also provided on the inner wall of the locking half-tube. The second locking block is connected to the first locking block and is located below the first locking block. The surface of the second locking block is flush, and the end face of the second locking block is lower than the end face of the first locking block.

9. A wind turbine lightning protection and grounding system as claimed in claim 8, characterized in that: A limiting groove is arranged on the inner wall of the engaging half pipe, and the first locking block and the second locking block are detachably arranged in the limiting groove.

10. A wind turbine lightning protection and grounding system according to claim 8, characterized in that: A locking screw hole is penetrated through the side wall of the engaging half-tube, and the engaging half-tube is provided with a locking screw pin, which is screwed into the locking screw hole. The locking screw pin has a pointed end and faces the surface of the down conductor.

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