Wind power blade lightning protection structure

Abstract

The invention discloses a wind power blade lightning protection structure, and particularly relates to the technical field of wind power blade lightning protection, the wind power blade lightning protection structure comprises a central cylinder, the outer wall of the central cylinder is fixedly connected with three wind power blades, the end part of each wind power blade is provided with a mounting seat, the end part of each mounting seat is provided with a lightning arrester, and the connecting end of each lightning arrester is electrically connected with a grounding wire; one end of the grounding wire sequentially penetrates through the mounting base and the wind power blade and extends into the center cylinder, a wire penetrating hole for the grounding wire to penetrate through is formed in the center cylinder, and an anti-scattering mechanism for grounding the grounding wire is arranged on the inner wall of the center cylinder. The lightning arrester can be conveniently and stably installed at the end of the fan blade, it can be guaranteed that the height of the lightning arrester is located at the highest point of the wind power blade, and therefore lightning protection treatment is effectively conducted through the grounding wire, the effects of supporting and tension adjusting can be achieved on the grounding wire arranged in the center cylinder, and the service life of the lightning arrester is prolonged. Therefore, the problem of breakage of the grounding lead is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of lightning protection for wind turbine blades, and more specifically, to a lightning protection structure for wind turbine blades. Background Art

[0002] Lightning strikes are the main cause of unexpected shutdowns of wind turbines. Not only do they cause megawatts of power loss, but they also generate huge operating and maintenance costs. Wind turbines are particularly susceptible to lightning strikes because they have huge rotating blades and are exposed to the natural environment for a long time. Lightning can directly or indirectly cause serious damage to almost all components of wind turbines, including blades, control systems and other electronic components. Therefore, lightning protection structures need to be set up to prevent lightning from directly damaging the equipment.

[0003] After searching, the Chinese patent with announcement number CN210317620U discloses a wind turbine blade lightning protection structure and a wind turbine blade, which belongs to the field of wind turbine blade lightning protection technology. A discharge path is formed through a metal probe, a connecting wire, a metal blade tip, and a grounding lead. Under the action of the strong electric field of the downward leader of a lightning strike, the metal probe closer to the lightning will have a higher probability of starting an upward leader than the grounding lead, and form a discharge path with the downward leader. This effectively reduces the induced charge around the grounding lead to form a streamer discharge, further forming an upward leader to penetrate the blade, which can effectively protect the safety of the blade in a lightning strike environment.

[0004] After passing through the wind turbine blades, the grounding lead in the lightning protection structure of the wind turbine blades will be introduced into the center tube connected to the wind turbine blades, and then introduced into the ground. However, in actual use, since the length of the grounding lead itself needs to be slightly longer during use for ease of installation and to avoid affecting normal use when it is shorter, the grounding lead will be partially loosely placed inside the center tube during installation. When the wind turbine blades and the center tube rotate, the loose grounding wire will swing continuously, which may easily cause the grounding wire to be damaged and affect its use. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a lightning protection structure for wind turbine blades.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a lightning protection structure for wind turbine blades, comprising a central tube, three wind turbine blades are fixedly connected to the outer wall of the central tube, a mounting seat is installed at the end of each wind turbine blade, a lightning rod is installed at the end of the mounting seat, and a connecting end of the lightning rod is electrically connected to a grounding wire, one end of the grounding wire passes through the mounting seat and the wind turbine blade in sequence and extends to the interior of the central tube, a threading hole for the grounding wire to pass through is provided inside the central tube, and an anti-scattering mechanism for grounding the grounding wire is provided on the inner wall of the central tube, and a connecting mechanism is provided between the end of the wind turbine blade and the mounting seat.

[0007] As a further improvement of the technical solution of the present invention, the connecting mechanism includes an embedding groove arranged at the end of the wind turbine blade for inserting the end of the mounting seat, an insulating sealing gasket is arranged at the inner wall edge of the embedding groove, and both outer walls of the wind turbine blade are connected with locking bolts for locking the position of the mounting seat.

[0008] As a further improvement of the technical solution of the present invention, a threading cavity for the grounding wire to pass through is provided inside the wind turbine blade, and a V-shaped opening is provided at the end of the threading cavity, which is connected to the inside of the embedding groove.

[0009] As a further improvement of the technical solution of the present invention, threaded holes are provided at the connection points between the wind turbine blade and the mounting seat corresponding to the locking bolts, and notches are provided at the outer wall of the wind turbine blade corresponding to the end positions of the locking bolts.

[0010] As a further improvement of the technical solution of the present invention, a through hole for the grounding wire to pass through is provided inside the central tube, and the through hole is connected to the inside of the threading cavity.

[0011] As a further improvement of the technical solution of the present invention, the anti-scattering mechanism includes a rotating seat welded to the inner wall of the central tube, the inner side of the end of the rotating seat is movably connected with a flip frame through a rotating shaft, the end of the flip frame is equipped with a guide wheel for bypassing the grounding wire, and an adaptive adjustment component is connected between the outer wall of the flip frame and the inner wall of the central tube, and the adaptive adjustment component is set with the position of the rotating shaft on the rotating seat as the arc center.

[0012] As a further improvement of the technical solution of the present invention, the adaptive adjustment component includes an arc-shaped tube fixedly connected to the inner wall of the central tube, the inner side of the end of the arc-shaped tube is connected to an arc-shaped rod fixedly connected to the outer wall of the flip frame, an arc-shaped cavity is arranged inside the arc-shaped tube at a position corresponding to the active trajectory of the arc-shaped rod, and a spring is connected between the end of the arc-shaped rod and the inner wall of the end of the arc-shaped cavity.

[0013] Beneficial effects of the present invention:

[0014] 1. By connecting a mounting seat to the end of a wind turbine blade, installing a lightning receptor at the end of the mounting seat, and providing a connecting mechanism between the end of the wind turbine blade and the mounting seat, it is convenient to install and remove the mounting seat at the end of the wind turbine blade, ensure that the mounting seat is installed and fixed at the end of the wind turbine blade, and then facilitate the stable installation of the lightning receptor at the end of the wind turbine blade, and ensure that the height of the lightning receptor is at the highest point of the wind turbine blade, so as to effectively perform lightning protection by using the grounding wire;

[0015] 2. An anti-scattering mechanism is provided on the inner wall of the center tube for grounding the grounding wire, and the guide wheel is used to guide and support the grounding wire. The contraction of the arc rod is controlled by the extension and contraction of the spring in the adaptive adjustment component, so that the flip frame can adapt to the tension of the grounding wire, thereby supporting and adjusting the tension of the grounding wire placed in the center tube, thereby avoiding the occurrence of the problem of grounding wire breakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of installing the lightning protection structure of the present invention on the fan blade.

[0017] Figure 2 For the present invention Figure 1 Enlarged view of part A.

[0018] Figure 3 It is a schematic diagram of the internal structure of the central tube in the present invention.

[0019] Figure 4 It is a schematic diagram of the external structure of the adaptive adjustment component in the present invention.

[0020] Figure 5 It is a cross-sectional view of the adaptive adjustment component in the present invention.

[0021] The accompanying drawings are marked as follows: 1. center tube; 2. wind turbine blade; 3. mounting seat; 4. embedding groove; 5. insulating sealing gasket; 6. lightning arrester; 7. grounding wire; 8. threading cavity; 9. locking bolt; 10. threaded hole; 11. notch; 12. threading hole; 13. through hole; 14. rotating seat; 15. flip frame; 16. guide wheel; 17. adaptive adjustment component; 171. arc tube; 172. arc rod; 173. arc cavity; 174. spring. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] As attached Figure 1-5 A wind turbine blade lightning protection structure shown includes a central tube 1, and three wind turbine blades 2 are fixedly connected to the outer wall of the central tube 1, and a mounting seat 3 is installed at the end of each wind turbine blade 2, and a lightning rod 6 is installed at the end of the mounting seat 3. The connecting end of the lightning rod 6 is electrically connected to a grounding wire 7, and one end of the grounding wire 7 passes through the mounting seat 3 and the wind turbine blade 2 in sequence and extends to the inside of the central tube 1. The inside of the central tube 1 is provided with a threading hole 12 for the grounding wire 7 to pass through, and the inner wall of the central tube 1 is provided with an anti-scattering mechanism after the grounding wire 7 is grounded, and a connecting mechanism is provided between the end of the wind turbine blade 2 and the mounting seat 3.

[0024] As attached Figure 1-2 As shown, the connecting mechanism includes an embedding groove 4 arranged at the end of the wind turbine blade 2 for inserting the end of the mounting seat 3, an insulating sealing gasket 5 is arranged at the inner wall edge of the embedding groove 4, and the two outer walls of the wind turbine blade 2 are connected with locking bolts 9 for locking the position of the mounting seat 3, and the interior of the wind turbine blade 2 is provided with a threading cavity 8 for the grounding wire 7 to pass through, and the end of the threading cavity 8 is provided with a V-shaped opening portion, which is connected to the interior of the embedding groove 4, and threaded holes 10 are arranged at the connection between the wind turbine blade 2 and the mounting seat 3 corresponding to the locking bolt 9, and a notch 11 is arranged on the outer wall of the wind turbine blade 2 corresponding to the end position of the locking bolt 9, which is convenient for the installation and fixation of the mounting seat 3 at the end of the wind turbine blade 2, and further facilitates the stable installation of the lightning arrester 6 at the end of the wind turbine blade 2.

[0025] As attached Figure 1-3 As shown, a through hole 13 for the grounding wire 7 to pass through is provided inside the central tube 1 , and the through hole 13 is communicated with the inside of the threading cavity 8 , so as to facilitate the installation of the grounding wire 7 .

[0026] As attached Figure 1 and attached Figure 3-5As shown, the anti-scattering mechanism includes a rotating seat 14 welded to the inner wall of the central tube 1, and the inner side of the end of the rotating seat 14 is movably connected to a flip frame 15 through a rotating shaft, and the end of the flip frame 15 is installed with a guide wheel 16 for the grounding wire 7 to bypass, and an adaptive adjustment component 17 is connected between the outer wall of the flip frame 15 and the inner wall of the central tube 1. The adaptive adjustment component 17 is set with the position of the rotating shaft on the rotating seat 14 as the arc center. The adaptive adjustment component 17 includes an arc tube 171 fixedly connected to the inner wall of the central tube 1, and the inner side of the end of the arc tube 171 is connected to an arc rod 172 fixedly connected to the outer wall of the flip frame 15, and the interior of the arc tube 171 corresponds to the movable arc rod 172. An arc cavity 173 is provided at the moving track position, and a spring 174 is connected between the end of the arc rod 172 and the inner wall of the end of the arc cavity 173. Since the length of the grounding wire 7 itself needs to be slightly longer when in use for ease of installation and to avoid affecting normal use when it is shorter, the grounding wire 7 will be partially loosely placed inside the central tube 1 during installation. When the wind turbine blades 2 and the central tube 1 rotate, the loose grounding wire 7 will swing continuously, which may easily cause the grounding wire 7 to be damaged and affect its use. The anti-scattering mechanism is convenient for supporting and adjusting the tension of the grounding wire 7 placed in the central tube 1, thereby avoiding the occurrence of damage to the grounding wire 7.

[0027] Working principle: The present invention designs a lightning protection structure for wind turbine blades. The specific structure is as shown in the attached manual. Figure 1-5 As shown, in the present technical scheme, a mounting seat 3 is connected to the end of the wind turbine blade 2, and a lightning receptor 6 is installed at the end of the mounting seat 3, and the connection end of the lightning receptor 6 is electrically connected to the grounding wire 7, wherein a connecting mechanism is arranged between the end of the wind turbine blade 2 and the mounting seat 3, so as to facilitate the installation and removal of the mounting seat 3 at the end of the wind turbine blade 2, ensure that the mounting seat 3 is installed and fixed at the end of the wind turbine blade 2, and then facilitate the stable installation of the lightning receptor 6 at the end of the wind turbine blade 2, and ensure that the height of the lightning receptor 6 is at the highest point of the wind turbine blade 2, so as to effectively perform lightning protection treatment by using the grounding wire 7, and an anti-scattering mechanism for grounding the grounding wire 7 is arranged on the inner wall of the central tube 1, and the guide wheel 16 is used to guide and support the grounding wire 7, and the expansion and contraction of the spring 174 in the adaptive adjustment component 17 is used to control the contraction of the arc rod 172, so that the flip frame 15 can adapt to the tension of the grounding wire 7, thereby supporting and adjusting the tension of the grounding wire 7 placed in the central tube 1, thereby avoiding the occurrence of the problem of the grounding wire 7 being damaged.

[0028] Among them, in the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the case of no conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0029] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wind turbine blade lightning protection structure, comprising a central tube (1), wherein the outer wall of the central tube (1) is fixedly connected with three wind turbine blades (2), characterized in that: A mounting seat (3) is installed at the end of each wind turbine blade (2), a lightning receptor (6) is installed at the end of the mounting seat (3), a connecting end of the lightning receptor (6) is electrically connected to a grounding wire (7), one end of the grounding wire (7) passes through the mounting seat (3) and the wind turbine blade (2) in sequence and extends to the inside of the central tube (1), a threading hole (12) for the grounding wire (7) to pass through is provided inside the central tube (1), and an anti-scattering mechanism for grounding the grounding wire (7) after the inner wall of the central tube (1) is provided, and a connecting mechanism is provided between the end of the wind turbine blade (2) and the mounting seat (3).

2. The wind turbine blade lightning protection structure according to claim 1, characterized in that: The connection mechanism comprises an embedding groove (4) provided at the end of the wind turbine blade (2) for inserting the end of the mounting seat (3), an insulating sealing pad (5) is provided at the inner wall edge of the embedding groove (4), and both outer walls of the wind turbine blade (2) are connected with locking bolts (9) for locking the position of the mounting seat (3).

3. The wind turbine blade lightning protection structure according to claim 2 is characterized in that: The wind turbine blade (2) is provided with a threading cavity (8) for the grounding wire (7) to pass through, and the end of the threading cavity (8) is provided with a V-shaped opening portion, and the V-shaped opening portion is communicated with the interior of the embedding groove (4).

4. The wind turbine blade lightning protection structure according to claim 2, characterized in that: The wind turbine blade (2) and the mounting seat (3) are both provided with threaded holes (10) at the connection points corresponding to the locking bolts (9), and the outer wall of the wind turbine blade (2) is provided with notches (11) at the positions of the end portions of the locking bolts (9).

5. The wind turbine blade lightning protection structure according to claim 1, characterized in that: A through hole (13) for the grounding wire (7) to pass through is provided inside the central tube (1), and the through hole (13) is communicated with the inside of the threading cavity (8).

6. The wind turbine blade lightning protection structure according to claim 1, characterized in that: The anti-scattering mechanism comprises a rotating seat (14) welded to the inner wall of the central tube (1); the inner side of the end of the rotating seat (14) is movably connected to a flip frame (15) via a rotating shaft; the end of the flip frame (15) is equipped with a guide wheel (16) for the grounding wire (7) to bypass; an adaptive adjustment component (17) is connected between the outer wall of the flip frame (15) and the inner wall of the central tube (1); the adaptive adjustment component (17) is arranged with the position of the rotating shaft on the rotating seat (14) as the arc center.

7. The wind turbine blade lightning protection structure according to claim 1, characterized in that: The adaptive adjustment component (17) comprises an arc-shaped cylinder (171) fixedly connected to the inner wall of the central cylinder (1); the inner side of the end of the arc-shaped cylinder (171) is connected to an arc-shaped rod (172) fixedly connected to the outer wall of the flip frame (15); an arc-shaped cavity (173) is arranged inside the arc-shaped cylinder (171) at a position corresponding to the moving track of the arc-shaped rod (172); and a spring (174) is connected between the end of the arc-shaped rod (172) and the inner wall of the end of the arc-shaped cavity (173).

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