A lightning protection device for blade tip of wind turbine generator
By installing the first lightning rod and the second electrode on the wind turbine blades, traction and guidance of lightning to the grounding body, the problem of wind turbines being susceptible to lightning strikes in thunderstorms is solved, and the lightning protection effect is achieved to prevent equipment damage.
Patent Information
- Application Number
- CN202421349150.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-13
- Publication Date
- 2025-04-01
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Wind turbines are easily hit by lightning in thunderstorms, especially their slender blades are easily pulled by lightning, causing lightning to come into contact with the entire wind turbine and causing damage.
A wind turbine blade tip lightning protection device is designed, including a first lightning rod installed at the end of the blade, and through the design of the first lightning rod and the second electrode, lightning is pulled and guided to the grounding body.
It effectively avoids lightning contact with the wind turbine, prevents damage to the blades and internal electrical equipment, and ensures the normal operation of the wind turbine.
Smart Images
Figure CN222702082U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of wind generators, in particular to a lightning protection device for blade tips of wind generator blades. Background Art
[0002] A wind turbine is an electrical device that converts wind energy into mechanical work, which drives the rotor to rotate and ultimately outputs alternating current. A wind turbine generally consists of components such as a wind wheel, a generator, a direction regulator, a tower, a speed limiting safety mechanism and an energy storage device.
[0003] The working principle of a wind turbine is relatively simple. The wind rotor rotates under the action of wind, converting the kinetic energy of the wind into mechanical energy of the wind rotor shaft. The generator rotates and generates electricity driven by the wind rotor shaft. Broadly speaking, wind energy is also solar energy, so it can also be said that a wind turbine is a heat energy generator that uses the sun as a heat source and the atmosphere as a working medium.
[0004] Since the wind turbine's wind rotor needs to be installed at a high place, it is easy to be struck by lightning during a thunderstorm. However, the existing technology is still unable to utilize lightning, resulting in wind turbines, especially their blades, which are mostly slender and more easily attracted by lightning when struck by lightning, causing the lightning to come into contact with the entire wind turbine and cause it to be damaged. In particular, the electrical equipment inside it, such as the generator, is more susceptible to damage when affected by the high voltage of lightning. Utility Model Content
[0005] The utility model aims to solve the above-mentioned shortcomings in the prior art and proposes a lightning protection device for the blade tip of a wind turbine generator blade.
[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a wind turbine blade tip lightning protection device is designed, including a nacelle, a support column is installed at the bottom of the nacelle, the nacelle is a nacelle body with an opening at one end, a hub cover is rotatably installed at the opening of the nacelle, at least three blades arranged at intervals are arranged on the side of the hub cover, a connecting rod is installed at one end of the blade close to the hub cover, the connecting rod penetrates the hub cover and is connected to the hub, and the end of the hub is connected to a drive shaft, and a power generation mechanism is installed on the other end of the drive shaft, and fixed seats are rotatably installed at both ends of the drive shaft, and the fixed seats are fixed to the bottom of the nacelle;
[0007] A cavity is correspondingly provided in the blade, and the connecting rod is a hollow tube. A first lightning rod is installed at one end of the connecting rod away from the blade. The first lightning rod is arranged along the length direction of the blade, and a first transition joint is installed at one end of the first lightning rod located in the cavity;
[0008] A sleeve is coaxially installed at one end of the driving shaft close to the hub, and a plurality of spaced annular plates are installed on the sleeve, and an annular first electrode is coaxially installed on one side of the annular plate, and the first electrode is connected to the first transition joint through a wire, and a second electrode is arranged on the first electrode, and the second electrode is abutted against the first electrode, and the second electrode is installed on a support plate, and the support plate is fixed on a support frame, and the support frame is fixed to a fixed seat, and the second electrode is connected to a grounding controller through a wire, and the grounding controller is arranged in a control cabinet, and the control cabinet is installed in the cabin, and a grounding wire is connected to the grounding controller, and the other end of the grounding wire is connected to a grounding body.
[0009] Preferably, a connecting seat is installed at the end of the blade away from the connecting rod, a through hole is opened on the connecting seat, the through hole penetrates into the cavity, and a supporting tube is arranged in the through hole, the first lightning rod is arranged in the supporting tube, a mounting seat is installed on the top of the supporting tube, and the mounting seat is installed on the connecting seat.
[0010] Preferably, an insulating elastic rubber pad is installed on the inner wall of the support tube, and the elastic rubber pad is interference fit with the first lightning rod.
[0011] Preferably, screw holes are provided at both ends of the top of the connecting seat, and the mounting seat is mounted on the connecting seat by bolts corresponding to the screw holes.
[0012] Preferably, the power generation mechanism includes a stator, which is connected to a controller in a control cabinet through a wire, the stator is sleeved on a drive shaft, and the stator and the nacelle are fixed by a connecting frame, a first rotor and a second rotor are respectively provided on both sides of the stator, the first rotor and the second rotor are coaxially fixed on the drive shaft, and a permanent magnet is installed on the side where the first rotor and the second rotor are relatively close.
[0013] Preferably, a cylindrical insulating cover is provided at one end of the driving shaft, the annular plate and the supporting plate are both placed in the insulating cover, one end of the insulating cover is rotatably mounted on the driving shaft, and the other end of the insulating cover is fixed on the fixing seat.
[0014] Preferably, a second lightning rod is provided above the nacelle, a second transition joint is installed at the bottom of the second lightning rod, and the second transition joint is connected to the grounding body through a grounding wire.
[0015] The design scheme proposed by the utility model has the following beneficial effects during application:
[0016] 1. The blade tip lightning protection device of the wind turbine generator is connected to the end of the blade through the first lightning rod, and the lightning falling on the blade is pulled, thereby leading the lightning to the grounding body and allowing the lightning to be introduced into the ground.
[0017] 2. The wind turbine blade tip lightning protection device rotates with the rotation of the drive shaft through the second electrode on the first electrode, ensuring the traction of lightning by the first lightning protection device, and preventing the wire from being entangled due to the rotation of the blade, thereby causing damage to the wire and affecting current transmission. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 The structure of the utility model is shown in FIG. Figure 1 ;
[0019] Figure 2 The structure of the utility model is shown in FIG. Figure 2 ;
[0020] Figure 3 This is a diagram of the internal structure of the cabin of the utility model;
[0021] Figure 4 This is a structural diagram of the first lightning rod of the utility model;
[0022] Figure 5 This is a front view of the internal structure of the cabin of the utility model;
[0023] Figure 6 It is an enlarged view of point A of the present utility model.
[0024] In the figure: 1, cabin; 2, hub cover; 3, blades; 4, connecting rod; 5, hub; 6, drive shaft; 7, fixed seat; 8, first rotor; 9, second rotor; 10, stator; 11, permanent magnet; 12, control cabinet; 13, cavity; 14, first lightning rod; 15, connecting seat; 16, through hole; 17, screw hole; 18, mounting seat; 19, support tube; 20, first transition joint; 21, sleeve; 22, annular plate; 23, first electrode; 24, support frame; 25, support plate; 26, second electrode; 27, support column; 28, second lightning rod; 29, second transition joint. DETAILED DESCRIPTION
[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.
[0026] Reference Figure 1-Figure 6 A wind turbine blade tip lightning protection device comprises a nacelle 1, a support column 27 is installed at the bottom of the nacelle 1, the nacelle 1 is a nacelle body with an opening at one end, and a control cabinet 12 is installed in the nacelle 1;
[0027] A hub cover 2 is rotatably mounted at the opening of the nacelle 1, and at least three blades 3 are arranged at intervals on the side of the hub cover 2. A connecting rod 4 is installed at one end of the blade 3 close to the hub cover 2. The connecting rod 4 penetrates the hub cover 2 and is connected to the hub 5. A driving shaft 6 is connected to the end of the hub 5, and a power generation mechanism is installed on the other end of the driving shaft 6. Fixed seats 7 are rotatably mounted on both ends of the driving shaft 6, and the fixed seats 7 are fixed to the bottom of the nacelle 1. When the blade 3 is subjected to wind force, it will start to rotate, thereby driving the driving shaft 6 to rotate, so that the power generation mechanism generates electricity.
[0028] Among them, Figure 3 and Figure 5 As shown, the power generation mechanism includes a stator 10, which is connected to a controller in a control cabinet 12 through a wire. The stator 10 is sleeved on the drive shaft 6, and the stator 10 is fixed to the nacelle 1 through a connecting frame. A first rotor 8 and a second rotor 9 are respectively provided on both sides of the stator 10. The first rotor 8 and the second rotor 9 are coaxially fixed on the drive shaft 6, and a permanent magnet 11 is installed on the side where the first rotor 8 and the second rotor 9 are relatively close, so that the rotor cuts the magnetic flux lines around the stator 10, thereby performing power generation operation.
[0029] Such as 3 and Figure 4 As shown, a cavity 13 is correspondingly provided in the blade 3, and the connecting rod 4 is a hollow tube, and a first lightning rod 14 is installed at one end of the connecting rod 4 away from the blade 3. The first lightning rod 14 is arranged along the length direction of the blade 3, and a first transition joint 20 is installed at one end of the first lightning rod 14 located in the cavity 13. In thunderstorm weather, the first lightning rod 14 can pull the lightning falling on the blade 3, so as to prevent the lightning from falling into the nacelle 1 along the blade 3, thereby affecting the power generation of the power generation mechanism.
[0030] Among them, Figure 4 As shown, a connecting seat 15 is installed at the end of the blade 3 away from the connecting rod 4, a through hole 16 is opened on the connecting seat 15, the through hole 16 penetrates into the cavity 13, and a support tube 19 is arranged in the through hole 16, the first lightning rod 14 is arranged in the support tube 19, a mounting seat 18 is installed on the top of the support tube 19, and the mounting seat 18 is installed on the connecting seat 15, which is convenient for the installation and disassembly of the first lightning rod 14, so as to replace and maintain the first lightning rod 14; in actual use, the wire connected to the first transition joint 20 is placed in the cavity 13 and the connecting rod 4, which is convenient for hiding the wire and does not affect the disassembly operation of the first lightning rod 14.
[0031] Furthermore, screw holes 17 are opened at both ends of the top of the connecting seat 15, and the mounting seat 18 is installed on the connecting seat 15 by bolts corresponding to the screw holes 17. When the first lightning rod 14 is actually disassembled, the bolts are unscrewed first, and then the mounting seat 18 and the first lightning rod 14 can be removed from the blade 3 together.
[0032] In order to improve the fastening of the first lightning rod 14 in the support tube 19 and the ability to prevent leakage, an insulating elastic rubber pad is installed on the inner wall of the support tube 19. The elastic rubber pad has an interference fit with the first lightning rod 14. The elasticity of the elastic rubber pad can not only exert an extrusion effect on the first lightning rod 14 to ensure the fixation of the first lightning rod 14, but also play a role of isolation and insulation between the first lightning rod 14 and the support tube 19.
[0033] like Figure 3 and Figure 6 As shown, a sleeve 21 is coaxially mounted on one end of the drive shaft 6 close to the hub 5, a plurality of spaced annular plates 22 are mounted on the sleeve 21, and an annular first electrode 23 is coaxially mounted on one side of the annular plate 22, the first electrode 23 is connected to the first transition joint 20 through a wire, a second electrode 26 is arranged on the first electrode 23, and the second electrode 26 is against the first electrode 23, the second electrode 26 is mounted on a support plate 25, the support plate 25 is fixed on a support frame 24, and the support frame 24 is fixed to the fixing seat 7, and the second electrode 26 is connected to the grounding controller through a wire, and the connection The ground controller is arranged in the control cabinet 12, and the grounding controller is connected with a grounding wire, and the other end of the grounding wire is connected with a grounding body. In actual use, the grounding body is buried under the ground to receive the lightning pulled by the first lightning rod 14 and introduce it into the ground; when the blade 3 rotates, the driving shaft 6 will drive the first electrode 23 to rotate in a circle, and in the rotation process, due to the annular structure of the first electrode 23 itself, the second electrode 26 is always in contact with the first electrode 23, so the current transmitted to the first electrode 23 by the first lightning rod 14 will be transmitted to the second electrode 26, and then introduced into the ground through the grounding wire.
[0034] Specifically, the support column 27 is a hollow column, and the grounding wire and the power transmission wire of the power generation mechanism are arranged in the support column 27 so that the wires are exposed to the external environment and are not damaged.
[0035] In order to prevent the electrode from leaking electricity, a cylindrical insulating cover is provided at one end of the driving shaft 6. The annular plate 22 and the support plate 25 are both placed in the insulating cover. One end of the insulating cover is rotatably mounted on the driving shaft 6, and the other end of the insulating cover is fixed on the fixing seat 7.
[0036] It should be further explained that a second lightning rod 28 is provided above the nacelle 1, and a second transition joint 29 is installed at the bottom of the second lightning rod 28. The second transition joint 29 is connected to the grounding body through a grounding wire, which can draw the lightning falling on the nacelle 1, thereby further improving the lightning protection effect of the entire wind turbine.
[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A wind turbine blade tip lightning protection device, comprising a nacelle (1), a support column (27) being installed at the bottom of the nacelle (1), characterized in that: The nacelle (1) is a nacelle with an opening at one end. A hub cover (2) is rotatably mounted at the opening of the nacelle (1). At least three blades (3) are arranged at intervals on the side of the hub cover (2). A connecting rod (4) is mounted on one end of the blade (3) close to the hub cover (2). The connecting rod (4) penetrates the hub cover (2) and is connected to the hub (5). A driving shaft (6) is connected to the end of the hub (5). A power generation mechanism is mounted on the other end of the driving shaft (6). Fixed seats (7) are rotatably mounted at both ends of the driving shaft (6). The fixed seats (7) are fixed to the bottom of the nacelle (1). A cavity (13) is correspondingly provided in the blade (3), and the connecting rod (4) is a hollow tube. A first lightning rod (14) is installed at one end of the connecting rod (4) away from the blade (3), the first lightning rod (14) is arranged along the length direction of the blade (3), and a first transition joint (20) is installed at one end of the first lightning rod (14) located in the cavity (13); A sleeve (21) is coaxially mounted on one end of the drive shaft (6) close to the hub (5), a plurality of annular plates (22) are mounted on the sleeve (21) and arranged at intervals, and an annular first electrode (23) is coaxially mounted on one side of the annular plate (22), the first electrode (23) is connected to the first transition joint (20) via a wire, a second electrode (26) is arranged on the first electrode (23), and the second electrode (26) abuts against the first electrode (23), the second electrode (26) is mounted on a support plate (25), the support plate (25) is fixed on a support frame (24), the support frame (24) is fixed to a fixing seat (7), and the second electrode (26) is connected to a grounding controller via a wire, the grounding controller is arranged in a control cabinet (12), and the control cabinet (12) is mounted in the cabin (1), and a grounding wire is connected to the grounding controller, and the other end of the grounding wire is connected to a grounding body.
2. A wind turbine blade tip lightning protection device according to claim 1, characterized in that: A connecting seat (15) is installed at one end of the blade (3) away from the connecting rod (4), a through hole (16) is opened on the connecting seat (15), the through hole (16) penetrates into the cavity (13), and a support tube (19) is arranged in the through hole (16), the first lightning rod (14) is arranged in the support tube (19), a mounting seat (18) is installed on the top of the support tube (19), and the mounting seat (18) is installed on the connecting seat (15).
3. A wind turbine blade tip lightning protection device according to claim 2, characterized in that: An insulating elastic rubber pad is installed on the inner wall of the support tube (19), and the elastic rubber pad is interference-fitted with the first lightning rod (14).
4. A wind turbine blade tip lightning protection device according to claim 2, characterized in that: Screw holes (17) are provided at both ends of the top of the connection seat (15), and the mounting seat (18) is mounted on the connection seat (15) via bolts corresponding to the screw holes (17).
5. A wind turbine blade tip lightning protection device according to claim 1, characterized in that: The power generation mechanism comprises a stator (10), the stator (10) being connected to a controller in a control cabinet (12) via a wire, the stator (10) being sleeved on a drive shaft (6), and the stator (10) being fixed to a nacelle (1) via a connecting frame, a first rotor (8) and a second rotor (9) being respectively provided on both sides of the stator (10), the first rotor (8) and the second rotor (9) being coaxially fixed on the drive shaft (6), and a permanent magnet (11) being installed on a side of the first rotor (8) and the second rotor (9) being relatively close.
6. A wind turbine blade tip lightning protection device according to claim 1, characterized in that: A cylindrical insulating cover is provided at one end of the driving shaft (6), the annular plate (22) and the support plate (25) are both placed in the insulating cover, one end of the insulating cover is rotatably mounted on the driving shaft (6), and the other end of the insulating cover is fixed on the fixing seat (7).
7. A wind turbine blade tip lightning protection device according to claim 1, characterized in that: A second lightning rod (28) is provided above the cabin (1), a second transition joint (29) is installed at the bottom of the second lightning rod (28), and the second transition joint (29) is connected to a grounding body via a grounding wire.