A lightning protection cross-connection device for blade root of a wind turbine generator system

Abstract

The utility model relates to blade lightning protection technical field, and disclose a kind of wind turbine generator system blade root lightning protection cross connection device.The utility model is connected by ball hinge connection mode between cross arm, first connecting arm and second connecting arm, and elastic conductive element is embedded in ball hinge, ensure that joint can keep stable electrical interconnection performance under any movement state, the length and joint quantity of each articulated arm are accurately calculated and optimized design, so that it can realize completely free movement within the maximum swing angle range of blade, while avoiding the sharp bending condition similar to braided belt, convert the bending fatigue problem easily produced by traditional flexible piece into the rotating friction between rigid articulated piece, by optimizing the material and lubrication mode of friction pair, not only greatly reduce the local stress concentration phenomenon, also solve the fatigue fracture problem produced by repeated bending of metal material, so that the service life of the whole device is significantly extended.

Description

Technical Field

[0001] This utility model relates to the field of blade lightning protection technology, specifically a lightning protection bridging device for the root of a wind turbine blade. Background Technology

[0002] With the rapid development of wind power generation technology, the capacity of a single unit continues to increase, and the size and rotation range of wind turbine blades also increase accordingly, which puts forward higher requirements for the unit's lightning protection system. As a key path for lightning current conduction, the reliability of the lightning protection bridging device at the blade root is directly related to the safe operation of the unit.

[0003] Currently, common lightning protection bridging structures mostly use flexible metal braided strips or soft conductors, relying on the bending deformation of the material itself to adapt to the oscillation and rotation of the blades. However, such structures are prone to stress concentration due to repeated bending during long-term operation, leading to metal fatigue fracture, which in turn causes the lightning protection path to fail and may even cause lightning damage to the unit. In addition, existing lightning protection bridging devices generally lack effective condition monitoring methods and usually rely on periodic shutdown inspections, making it difficult to detect connection status, abnormal electrical performance, or mechanical loosening in real time. This "post-maintenance" mode not only increases unplanned downtime and maintenance costs but also, to some extent, creates potential safety hazards. Therefore, a lightning protection bridging device for the root of wind turbine blades is proposed. Utility Model Content

[0004] The purpose of this utility model is to provide a lightning protection bridging device for the root of wind turbine blades, which solves the technical problem that traditional device structures are prone to stress concentration due to repeated bending during long-term operation, leading to metal fatigue fracture and subsequent failure of the lightning protection path. By optimizing the materials and lubrication methods of the friction pair, it not only greatly reduces the phenomenon of local stress concentration, but also solves the problem of fatigue fracture of metal materials caused by repeated bending.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a lightning protection bridging device for the root of a wind turbine blade, comprising a bridging arm, a connecting assembly, two ball joints, and a monitoring assembly. The connecting assembly and the ball joints are both mounted on the bridging arm, and the monitoring assembly is mounted on the inner wall of the bridging arm.

[0006] The connecting assembly includes a first connecting arm disposed at the upper end of a crossover arm, and a second connecting arm disposed at the lower end of the crossover arm. The crossover arm, the first connecting arm, and the second connecting arm are all connected by ball joints. Universal flange connecting seats are fixedly connected to the upper surface of the first connecting arm and the lower surface of the second connecting arm. Mounting plates are fixedly connected to the front end and the rear end of the universal flange connecting seat on the outer wall away from the crossover arm. Limiting rods are fixedly connected to both sides of the mounting plates, and fixing plates are slidably connected to the outside of the limiting rods.

[0007] Preferably, the middle part of the front mounting plate is threaded with a threaded rod, the rear end of the threaded rod is rotatably connected to the fixed plate, and the outer wall of the front end of the threaded rod is fixedly connected with a rotating disk. The threaded rod can drive the fixed plate to move, and the rotating disk makes it convenient for the operator to rotate the threaded rod.

[0008] Preferably, both sides of the upper end of the fixing plate and the rear mounting plate are threaded with bolts, and the front end of each bolt is threaded with a nut, so that the fixing plate can be fixed by the bolts and nuts.

[0009] Preferably, the monitoring component includes a miniature monitoring circuit board, and the jumper arm has an internal mounting cavity. The miniature monitoring circuit board is located at the upper end of the mounting cavity and collects key parameter data such as conduction status, operating current value, and connector contact pressure in real time through the miniature monitoring circuit board.

[0010] Preferably, a central processing unit is provided in the middle of the mounting cavity, and a wireless signal transceiver module is provided at the lower end of the mounting cavity. Both the central processing unit and the wireless signal transceiver module are covered with protective sleeves made of asbestos material. Data processing and transmission are performed through the central processing unit and the wireless signal transceiver module, and the protective sleeves can protect the central processing unit and the wireless signal transceiver module.

[0011] Preferably, a connecting plate is snapped into the middle of the front end of the jumper arm, and the micro monitoring circuit board, central processing unit and wireless signal transceiver module are all electrically connected. The snap-fit ​​connection of the connecting plate makes it easy to open the mounting cavity, and the electrical connection facilitates signal transmission and reception.

[0012] This utility model provides a lightning protection bridging device for the root of wind turbine blades. It has the following beneficial effects:

[0013] (1) This utility model uses a ball joint connection between the jumper arm, the first connecting arm and the second connecting arm, and embeds an elastic conductive element inside the ball joint to ensure that the joint is in any movement state.

[0014] All can maintain stable electrical connectivity. The length and number of joints of each hinge arm have been precisely calculated and optimized to enable it to move freely within the maximum swing angle range of the blade. At the same time, it avoids sharp bends like those of a braided belt. The bending fatigue problem that is prone to occur in traditional flexible parts is transformed into rotational friction between rigid hinges. By optimizing the materials and lubrication methods of the friction pairs, not only is the phenomenon of local stress concentration greatly reduced, but the problem of fatigue fracture caused by repeated bending of metal materials is also solved, which significantly extends the service life of the entire device.

[0015] (2) This utility model collects key parameter data such as conduction status, working current value, and connector contact pressure in real time through a micro monitoring circuit board. These data are sent to the central control system in the cabin via a wireless signal transceiver module. The system uses intelligent algorithms to process and analyze the received data in real time. When potential fault hazards such as circuit open circuit, current value exceeding the safe range, or insufficient connector contact pressure are detected, the system will immediately trigger a multi-level alarm mechanism and report fault alarms through various means such as sound and light alarms, screen prompts, and remote notifications. This realizes the transformation from the traditional "periodic maintenance" mode to the advanced "predictive maintenance" mode. Through real-time monitoring of equipment status and fault early warning, maintenance measures can be taken in time before a fault occurs, thereby significantly improving the operational safety and reliability of the entire unit system. At the same time, it also greatly reduces the downtime risk and maintenance cost caused by sudden faults. Attached Figure Description

[0016] Figure 1 is a perspective view of the overall structure of this utility model;

[0017] Figure 2 is a schematic diagram of the internal structure of the mounting cavity in this utility model;

[0018] Figure 3 is a schematic diagram of the universal flange connection seat structure in this utility model;

[0019] Figure 4 is an enlarged view of point A in Figure 2.

[0020] In the diagram: 1. Jumper arm; 2. Connecting assembly; 21. First connecting arm; 22. Second connecting arm;

[0021] 23. Ball joint; 24. Universal flange connector; 25. Mounting plate; 26. Limiting rod; 27. Fixing plate;

[0022] 28. Threaded rod; 29. ​​Rotating disk; 210. Bolt; 211. Nut; 3. Monitoring component; 31. Miniature monitoring circuit board; 32. Mounting cavity; 33. Central processing unit; 34. Wireless signal transceiver module; 35.

[0023] 36. Protective sleeve; 37. Connecting plate. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0026] Example 1:

[0027] A preferred embodiment of the lightning protection bridging device for the root of a wind turbine blade provided by this utility model is shown in Figures 1-4: The lightning protection bridging device for the root of a wind turbine blade includes a bridging arm 1, a connecting component 2, two ball joints 23, and a monitoring component 3. The connecting component 2 and the ball joints 23 are both disposed on the bridging arm 1. The monitoring component 3 is disposed on the inner wall of the bridging arm 1. The connecting component 2 includes a first connecting arm 21 disposed at the upper end of the bridging arm 1, and a second connecting arm 22 disposed at the lower end of the bridging arm 1. The bridging arm 1, the first connecting arm 21, and the second connecting arm 22 are all connected by ball joints 23. Universal flange connecting seats 24 are fixedly connected to the upper surface of the first connecting arm 21 and the lower surface of the second connecting arm 22. The universal flange connecting seats 24 are located away from the bridging arm 1. Mounting plates 25 are fixedly connected to the front and rear ends of one side of the outer wall. Limiting rods 26 are fixedly connected to both sides between the mounting plates 25. Fixing plates 27 are slidably connected to the outside of the limiting rods 26.

[0028] The middle part of the front mounting plate 25 is threaded with threaded rods 28, the rear end of each threaded rod 28 is rotatably connected to the fixed plate 27, and the outer wall of the front end of each threaded rod 28 is fixedly connected with a rotating disk 29.

[0029] Both sides of the upper end of the fixing plate 27 and the rear mounting plate 25 are threaded with bolts 210.

[0030] The front end of each is threaded with a nut 211.

[0031] Furthermore, in this embodiment, the bridging arm 1, the first connecting arm 21, and the second connecting arm 22 are connected by a ball joint 23. An elastic conductive element is embedded inside the ball joint 23 to ensure stable electrical connectivity in any movement state of the joint. The length and number of joints of each hinge arm have been precisely calculated and optimized to enable it to move completely freely within the maximum swing angle range of the blade. At the same time, it avoids sharp bends like those of a braided belt. The bending fatigue problem that is prone to occur in traditional flexible parts is transformed into rotational friction between rigid hinges. By optimizing the material and lubrication method of the friction pair, not only is the local stress concentration phenomenon greatly reduced, but the fatigue fracture problem caused by repeated bending of metal materials is also solved, which significantly extends the service life of the entire device.

[0032] Example 2:

[0033] Based on Embodiment 1, a preferred embodiment of the lightning protection bridging device at the root of a wind turbine blade provided by this utility model is shown in Figures 1-4: The monitoring component 3 includes a miniature monitoring circuit board 31, and the bridging arm 1 has an installation cavity 32 inside, with the miniature monitoring circuit board 31 disposed at the upper end of the installation cavity 32;

[0034] A central processing unit 33 is provided in the middle of the mounting cavity 32, and a wireless signal transceiver module 34 is provided at the lower end of the mounting cavity 32. Both the central processing unit 33 and the wireless signal transceiver module 34 are covered with protective sleeves 35, which are made of asbestos material.

[0035] The connecting plate 36, the miniature monitoring circuit board 31, the central processing unit 33 and the wireless signal transceiver module 34 are all electrically connected via a snap-fit ​​connection at the middle of the front end of the jumper arm 1.

[0036] Furthermore, in this embodiment, key parameter data such as conduction status, operating current value, and connector contact pressure are collected in real time via a miniature monitoring circuit board 31. This data is transmitted to the central control system in the cabin via a wireless signal transceiver module 34. The system uses intelligent algorithms to process and analyze the received data in real time. When potential faults such as circuit open circuits, current values ​​exceeding safe ranges, or insufficient connector contact pressure are detected, the system immediately triggers a multi-level alarm mechanism, reporting fault alarms through various means such as audible and visual alarms, screen prompts, and remote notifications. This achieves a shift from traditional "periodic maintenance" to more comprehensive monitoring.

[0037] The shift from the traditional "predictive maintenance" model to the advanced "preventive maintenance" model enables timely maintenance measures to be taken before a fault occurs through real-time monitoring of equipment status and fault early warning. This significantly improves the operational safety and reliability of the entire unit system, while also greatly reducing the risk of downtime and maintenance costs caused by sudden faults.

[0038] In use, the rotating disk 29 drives the fixed plate 27 to move and connect to the dedicated terminals on the blade root flange and the hub flange respectively. After the connection is completed, the plate is fixed again by bolts 210 and nuts 211.

[0039] During operation, the bridging arm 1, the first connecting arm 21 and the second connecting arm 22 are connected by a ball joint 23. The ball joint 23 is embedded with an elastic conductive element to ensure that the joint maintains stable electrical connectivity under any movement state. The length and number of joints of each hinge arm have been precisely calculated and optimized to enable it to move completely freely within the maximum swing angle range of the blade. At the same time, it avoids sharp bending like a braided belt. The bending fatigue problem that is easy to cause in traditional flexible parts is transformed into rotational friction between rigid hinges. The material and lubrication method of the friction pair are optimized, which not only greatly reduces the phenomenon of local stress concentration, but also solves the problem of fatigue fracture caused by repeated bending of metal materials, thus significantly extending the service life of the entire device.

[0040] Simultaneously, the micro monitoring circuit board 31 collects key parameter data such as conduction status, operating current value, and connector contact pressure in real time. This data is processed by the central processor 33 and then transmitted to the central control system in the nacelle via the wireless signal transceiver module 34. The system uses intelligent algorithms to process and analyze the received data in real time. When potential fault hazards such as circuit open circuit, current value exceeding the safe range, or insufficient connector contact pressure are detected, the system will immediately trigger a multi-level alarm mechanism and report fault alarms through various means such as audible and visual alarms, screen prompts, and remote notifications. This realizes the transformation from the traditional "periodic maintenance" mode to the advanced "predictive maintenance" mode. Through real-time monitoring of equipment status and fault early warning, maintenance measures can be taken in time before a fault occurs, thereby significantly improving the operational safety and reliability of the entire unit system, while also greatly reducing the downtime risk and maintenance costs caused by sudden faults.

[0041] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A lightning protection bridging device for the root of a wind turbine blade, comprising a bridging arm (1), a connecting assembly (2), two ball joints (23), and a monitoring assembly (3), characterized in that: The connecting component (2) and the ball joint (23) are both disposed on the crossover arm (1). The monitoring component (3) is disposed on the inner wall of the crossover arm (1). The connecting component (2) includes a first connecting arm (21), which is disposed at the upper end of the crossover arm (1). A second connecting arm (22) is disposed at the lower end of the crossover arm (1). The crossover arm (1), the first connecting arm (21), and the second connecting arm (22) are all connected by a ball joint (23). A universal flange connecting seat (24) is fixedly connected to the upper surface of the first connecting arm (21) and the lower surface of the second connecting arm (22). A mounting plate (25) is fixedly connected to the front end and the rear end of the universal flange connecting seat (24) away from the outer wall of the side away from the crossover arm (1). Limiting rods (26) are fixedly connected to both sides of the mounting plates (25). A fixing plate (27) is slidably connected to the outside of the limiting rods (26).

2. The lightning protection bridging device at the root of a wind turbine blade according to claim 1, characterized in that: The mounting plate (25) at the front end is threaded with a threaded rod (28) in the middle. The rear end of the threaded rod (28) is rotatably connected to the fixing plate (27). The outer wall of the front end of the threaded rod (28) is fixedly connected with a rotating disk (29).

3. The lightning protection bridging device at the root of a wind turbine blade according to claim 2, characterized in that: Both sides of the upper end of the fixing plate (27) and the rear mounting plate (25) are threaded with bolts (210), and the front end of each bolt (210) is threaded with a nut (211).

4. The lightning protection bridging device at the root of a wind turbine blade according to claim 1, characterized in that: The monitoring component (3) includes a miniature monitoring circuit board (31), and the jumper arm (1) has an internal mounting cavity (32), with the miniature monitoring circuit board (31) located at the upper end of the mounting cavity (32).

5. A lightning protection bridging device for the root of a wind turbine blade according to claim 4, characterized in that: A central processing unit (33) is disposed in the middle of the mounting cavity (32), and a wireless signal transceiver module (34) is disposed at the lower end of the mounting cavity (32). The central processing unit (33) and the wireless signal transceiver module (34) are connected together. The external of each line signal transceiver module (34) is covered with a protective sleeve (35), which is made of asbestos material.

6. A lightning protection bridging device for the root of a wind turbine blade according to claim 4, characterized in that: A connecting plate (36) is attached to the middle of the front end of the jumper arm (1), and the micro monitoring circuit board (31), central processing unit (33) and wireless signal transceiver module (34) are electrically connected.

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