Wind power blade lightning arrester

Abstract

A wind power blade lightning arrester comprises a connecting part and a lightning arresting part, one end of the connecting part is connected with a blade tip of a wind power blade and connected with a cable, the other end of the connecting part is detachably connected with the lightning arresting part, the lightning arresting part is at least provided with a first contact face, and the connecting part is at least provided with a second contact face. And the connecting bolt penetrates through the contact surface I and the contact surface II to be tightly attached to form a conductive surface. According to the wind power blade lightning arrester, the connecting part and the lightning arresting part are tightly attached through the contact surfaces matched with each other to achieve electrical conduction, the contact area of the connecting part and the lightning arresting part is increased, impedance of electrical conduction after lightning is led is reduced, and the service life of the lightning arrester can be effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field related to wind power equipment manufacturing, in particular to a wind power blade lightning arrester. Background Art

[0002] Wind turbine blades are very easy to be damaged internally by lightning strikes due to their long length and high installation height in application conditions. Due to the high installation and maintenance costs of wind turbine blades, it is necessary to design a more reliable lightning protection device. The outer diameter of wind turbine blades gradually decreases from the root to the tip. When encountering thunderstorms, a specific lightning arrester needs to be installed at the tip of the blade to lead lightning into the ground through the built-in cable. At present, the lightning arrester at the tip of the wind turbine blade is fixedly connected or integrally formed during the blade molding and manufacturing. Since the lightning arrester has a certain working life, its surface will be damaged due to long-term work and lightning reception. After the lightning arrester is damaged, it is basically impossible to replace and maintain it because it is fixedly installed with the blade.

[0003] Through searching, it is found that there are also detachable blade tip lightning arrester technical solutions disclosed in the prior art, such as the invention patent publication document with the publication number "CN107429672A" and the name "A receiver for lightning protection system". A receiver assembly for a lightning protection system for wind turbine blades is disclosed, which includes a conductive carrier and a mounting bolt and / or a threaded rod, wherein each carrier is a metal component, and its arrangement and size are designed to surround at least a part of the mounting bolt or threaded rod without being in electrical contact with the mounting bolt or threaded rod, and at least a part of the outer surface of one end of each carrier is arranged as a contact surface for mechanical and electrical contact with the receiver base. The receiver involved in the technical solution disclosed in the comparative document can be disassembled and replaced separately, but it mainly uses the outer surface of one end of the carrier as the conductive contact surface, and the end face of the interceptor is a circular ring-shaped plane, and its contact area is very limited. The limited contact area will cause excessive temperature rise in the lightning conduction process, and may generate a high-voltage arc when the contact is poor, which may damage the surface of the receiver. In addition, the bolts used to fix the receiver will be under long-term stress due to the centrifugal force of the blades. After the bolts are deformed due to long-term stress, the tightening force will decrease, causing the receiver to loosen, thereby affecting the reliability of the receiver's electrical conduction.

[0004] The invention patent publication document with the publication number of "CN111734578A" and the name of "Megawatt-class wind turbine blade and its assembly, manufacturing method, and blade tip manufacturing method". A megawatt-class wind turbine blade and its assembly, manufacturing method, and blade tip manufacturing method are disclosed, belonging to the technical field of wind power equipment, wherein the megawatt-class wind turbine blade comprises: a blade body, the top of which has a mounting structure for connecting the blade tip; the blade tip is detachably connected to the top of the blade body through the mounting structure, the blade tip is entirely made of insulating material, the thickness of the blade tip is between 10cm and 40cm, and the top of the blade tip adopts a smooth transition; the megawatt-class wind turbine blade of the present invention does not have a lightning arrester at the top of the blade tip, the blade tip is entirely made of insulating material, the inside of the blade tip does not contain any conductive or semi-conductive material, and the top of the blade tip is designed to be a smooth transition, thereby improving the insulation strength of the blade tip. This comparative document is similar to the above-mentioned comparative document and solves the problem of disassembly and replacement of the lightning rod. However, in the technical solution disclosed in this comparative document, the blade tips are all made of insulating materials, the lightning protection performance is deteriorated, and the contact area of ​​the lightning rod is still very limited.

[0005] Therefore, it is of great significance to propose a blade tip lightning arrester with stable and reliable electrical conduction in the field. Utility Model Content

[0006] In view of the shortcomings of the prior art, the utility model provides a wind turbine blade lightning arrester, comprising a connecting part and a lightning arrester part, wherein one end of the connecting part is connected to the tip of the wind turbine blade and is connected to a cable, and the other end of the connecting part is detachably connected to the lightning arrester part, the lightning arrester part has at least one contact surface one, and the connecting part has at least one contact surface two, and the connecting bolts penetrate the contact surface one and the contact surface two so that the two are tightly fitted to form a conductive surface.

[0007] Furthermore, the contact surface one and the contact surface two are planes perpendicular to the axis of the wind turbine blade, a groove is provided on the connecting part or the lightning receiving part, and the connecting bolt is placed in the groove and passes through the contact surface one and the contact surface two to closely fit the two to form a vertical conductive surface.

[0008] Alternatively, the contact surface one and the contact surface two are both inclined surfaces that are not perpendicular to the axial direction of the wind turbine blade. A groove is provided on the connecting portion or the lightning arrester portion. The connecting bolt is placed in the groove and passes through the contact surface one and the contact surface two to tightly fit the two to form an inclined conductive surface.

[0009] Alternatively, the contact surface one and the contact surface two are both step surfaces, a groove is provided on the connecting part or the lightning receiving part, and a connecting bolt is placed in the groove to penetrate the contact surface one and the contact surface two, and then the two are tightly fitted to form a step-shaped conductive surface.

[0010] Furthermore, the connection part and the lightning receptor part also have mutually matching limiting surfaces. When the connection part and the lightning receptor part are relatively separated along the axial direction of the wind turbine blade, the limiting surfaces are closely fitted to each other to limit the relative separation of the connection part and the lightning receptor part.

[0011] Alternatively, one end of the connecting part has a dovetail tenon, and one end of the lightning arrester part has a dovetail groove. After the dovetail tenon is embedded in the dovetail groove, it has limiting surfaces that can fit tightly with each other; a groove is opened above the dovetail groove, and a connecting bolt is placed in the groove, passes through the dovetail groove along the axial direction of the wind turbine blade, and enters the dovetail tenon to lock the dovetail tenon and the dovetail groove.

[0012] Alternatively, one end of the connecting part has a dovetail tenon, and one end of the lightning arrester has a dovetail groove, the dovetail groove is closed at the bottom and open at the top, and the connecting bolt penetrates the dovetail tenon vertically along the axial direction of the wind turbine blade from the top end face of the dovetail tenon to lock the dovetail tenon and the dovetail groove.

[0013] Alternatively, one end of the connecting part has a dovetail tenon, and one end of the lightning conductor has a dovetail groove, the dovetail groove is closed at the bottom and open at the top, one end of the dovetail tenon is a wedge-shaped surface, a wedge-shaped top block is placed in the dovetail groove and fits the wedge-shaped surface, and after the connecting bolt passes through the wedge-shaped top block, the dovetail groove and the dovetail tenon can be tightly fitted through the wedge-shaped top block.

[0014] Alternatively, one end of the connection portion has a T-shaped head, and one end of the lightning arrester portion has a T-shaped slot with a closed bottom. The connecting bolt penetrates the T-shaped head vertically along the axial direction of the wind turbine blade from the top end face of the T-shaped head and then locks the T-shaped head and the T-shaped slot together.

[0015] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0016] 1. The wind turbine blade lightning arrester involved in the utility model realizes electrical conduction by closely fitting the connecting part and the lightning arrester through their respective contact surfaces that cooperate with each other, thereby increasing the contact area between the two, reducing the impedance of electrical conduction after receiving lightning, and effectively extending the service life of the lightning arrester.

[0017] 2. The wind turbine blade lightning arrester involved in the utility model increases the electrical conduction contact area, and the lightning arrester part and the connecting part are detachably connected by bolts. The lightning arrester part of the lightning arrester can be replaced separately, which reduces the maintenance cost of the entire blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 : Schematic diagram of the overall structure of the lightning arrester provided in the sixth embodiment of the utility model;

[0019] Figure 2 : Schematic diagram of the dispersed structure of the lightning receptor provided in the sixth embodiment of the present utility model;

[0020] Figure 3: A cross-sectional view of a lightning arrester provided in Embodiment 6 of the present utility model;

[0021] Figure 4 : A schematic diagram of the structure of a lightning arrester provided in Embodiment 5 of the present utility model;

[0022] Figure 5 : A cross-sectional view of a lightning arrester provided in Embodiment 1 of the present utility model;

[0023] Figure 6 : A cross-sectional view of a lightning arrester provided in Embodiment 2 of the present utility model;

[0024] Figure 7 : A cross-sectional view of a lightning arrester provided in Embodiment 3 of the present utility model;

[0025] Figure 8 : Schematic diagram of the overall structure of the lightning arrester provided in Embodiment 7 of the present utility model;

[0026] Fig. 9 : Schematic diagram of the overall structure of the lightning arrester provided in Example 4 of the utility model. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] A wind turbine blade lightning arrester comprises a connecting part 2 and a lightning arrester 1, wherein one end of the connecting part 2 is connected to the tip of the wind turbine blade and is connected to a cable, and the other end of the connecting part 2 is detachably connected to the lightning arrester 1, wherein the lightning arrester 1 has at least one contact surface 101, and the connecting part 2 has at least one contact surface 201, and a connecting bolt 3 passes through the contact surface 101 and the contact surface 201 so that the two are tightly fitted to form a conductive surface 10.

[0029] The above constitutes the basic structure of the lightning arrester, wherein the connecting part 2 and the lightning arrester part 1 are made of conductive metal parts. When the connecting bolt 3 is tightened to connect the two, the contact surface 101 and the contact surface 2 201 are tightly fitted to form a conductive surface 10. Compared with the prior art, the conductive surface 10 has a larger contact conductive area and can reduce the impedance of electrical conduction.

[0030] Embodiment 1: Figure 5 shown.

[0031] In this embodiment, the contact surface 1 101 and the contact surface 2 201 are both planes perpendicular to the axial direction of the wind turbine blade. A groove 4 is opened on the connecting part 2 or the lightning arrester part 1. The connecting bolt 3 is placed in the groove 4 and penetrates the contact surface 1 101 and the contact surface 2 201 to tightly fit the two to form a vertical conductive surface 10.

[0032] In this embodiment, the end faces of the connection part 2 and the lightning receptor 1 are a vertical plane, which is the contact surface 1 101 and the contact surface 2 201. When the connection part 2 and the lightning receptor 1 are locked by the connection bolt 3, the contact surface 1 101 and the contact surface 2 201 are tightly fitted to form a vertical conductive surface 10 for achieving electrical conduction between the two. The groove 4 can be an open groove for placing the connection bolt 3 in the groove, or it can be a groove with a certain height, and the connection bolt 3 can be placed in the groove to facilitate the locking connection between the connection part 2 and the lightning receptor 1.

[0033] Embodiment 2: Figure 6 shown.

[0034] In this embodiment, the contact surface 1 101 and the contact surface 2 201 are both inclined surfaces that are not perpendicular to the axial direction of the wind turbine blade. A groove 4 is opened on the connecting part 2 or the lightning arrester part 1. The connecting bolt 3 is placed in the groove 4 and passes through the contact surface 1 101 and the contact surface 2 201 to tightly fit the two to form an inclined conductive surface 10.

[0035] This embodiment is optimized based on the first embodiment. The contact surface 101 and the contact surface 201 are designed as an inclined surface. Obviously, when the two are attached together, an inclined conductive surface 10 will be formed, which has a larger contact area than the vertical conductive surface 10.

[0036] Embodiment 3: Figure 7 shown.

[0037] In this embodiment, the contact surface 1 101 and the contact surface 2 201 are both step surfaces, and a groove 4 is opened on the connecting part 2 or the lightning arrester part 1. The connecting bolt 3 is placed in the groove 4 and passes through the contact surface 101 and the contact surface 2 201 to tightly fit the two to form a step-shaped conductive surface 10.

[0038] The present embodiment further optimizes the design of the above-mentioned embodiment. In the present embodiment, the step-shaped contact surface 101 and the contact surface 2 201 will form a step-shaped conductive surface 10 after being tightly fitted, which will have a larger contact area than the inclined conductive surface of the second embodiment, and the connecting portion 2 and the lightning conductor 1 are relatively separated by a certain distance along the axial direction of the blade, and the contact surface 101 and the contact surface 2 201 still have a horizontal and tightly fitted conductive surface in the same direction as the axial direction of the blade. The solution under this design has better reliability.

[0039] Embodiment 4: Fig. 9 shown.

[0040] In this embodiment, the connecting part 2 and the lightning termination part 1 also have mutually matching limiting surfaces 20. When the connecting part 2 and the lightning termination part 1 are relatively separated along the axial direction of the wind turbine blade, the limiting surfaces 20 fit closely to each other to limit the relative separation of the connecting part 2 and the lightning termination part 1.

[0041] Specifically, one end of the connecting part 2 has a dovetail tenon 202, and one end of the lightning arrester part 1 has a dovetail groove 102. After the dovetail tenon 202 is embedded in the dovetail groove 102, it has a limiting surface 20 that can fit tightly with each other; a groove 4 is opened above the dovetail groove 102, and the connecting bolt 3 is placed in the groove 4 and penetrates the dovetail groove 102 along the axial direction of the wind turbine blade and enters the dovetail tenon 202 to lock the dovetail tenon 202 and the dovetail groove 102.

[0042] In this embodiment, the dovetail tenon 202 and the dovetail groove 102 each have a limiting surface 20 that cooperates with each other, and the black filled part in the figure shows the specific position of the limiting surface 20. When the connection part 2 and the lightning receptor 1 tend to separate relatively along the axial direction of the blade due to centrifugal force or loose bolts during the working rotation of the blade, the limiting surfaces 20 of the dovetail tenon 202 and the dovetail groove 102 will fit tightly to prevent the two from being relatively separated. At the same time, the tight fit of the limiting surface 20 can also be used as a conductive surface 10 to achieve electrical conduction. Obviously, the mutually contacting surfaces of the dovetail tenon 202 and the dovetail groove 102 other than the limiting surface 20 also serve as the conductive surface 10. Therefore, compared with the above-mentioned embodiment, this embodiment has better reliability, and the connection part 2 and the lightning receptor 1 can maintain a stable connection and a tight fit.

[0043] Embodiment 5: Figure 4 shown.

[0044] This embodiment is a preferred design based on the fourth embodiment. The connection part 2 has a dovetail tenon 202 at one end, and the lightning arrester 1 has a dovetail slot 102 at one end. The dovetail slot 102 is closed at the bottom and open at the top. The connecting bolt 3 penetrates the dovetail tenon 202 vertically along the axial direction of the wind turbine blade from the top end face of the dovetail tenon 202 to lock and connect the dovetail tenon 202 and the dovetail slot 102.

[0045] In this embodiment, an optimized design is also made based on the third embodiment. The dovetail groove 102 is closed at the bottom and open at the top. After the dovetail tenon 202 is embedded and fits tightly, a step-shaped conductive surface 10 is formed. Compared with the fourth embodiment, this embodiment has an additional contact surface where the bottom closed surface of the dovetail groove 102 and the bottom surface of the dovetail tenon 202 fit, which obviously further increases the contact area. In addition, the dovetail tenon 202 in this embodiment is placed in the dovetail groove 102 and supported by the bottom closed surface of the dovetail groove 102, so the connection is more stable.

[0046] Example 6: Figure 1~Figure 3 shown.

[0047] In this embodiment, one end of the connecting portion 2 has a dovetail tenon 202, and one end of the lightning arrester 1 has a dovetail groove 102. The dovetail groove 102 is closed at the bottom and open at the top. One end of the dovetail tenon 202 is a wedge-shaped surface 203. A wedge-shaped top block 5 is placed in the dovetail groove 102 and fits the wedge-shaped surface 203. After the connecting bolt 3 passes through the wedge-shaped top block 5, the dovetail groove 102 and the dovetail tenon 202 can be tightly fitted through the wedge-shaped top block 5.

[0048] In this embodiment, the fifth embodiment is further optimized by adding a wedge-shaped top block 5. The end faces of the wedge-shaped top block 5 and the dovetail tenon 202 are matched inclined surfaces. When the wedge-shaped top block 5 is locked by the connecting bolt 3 and displaced vertically downward, the dovetail tenon 202 can be pressed against the dovetail groove 102 along the axial direction of the wind turbine blade and fit tightly with the wedge-shaped top block 5 and the end faces of the dovetail tenon 202. This design makes the connection between the connecting part 2 and the lightning arrester 1 more stable and reliable, and the replacement is also more convenient.

[0049] Embodiment 7: Figure 8 shown.

[0050] This embodiment is a variation of the fifth embodiment. The connection part 2 has a T-shaped head 204 at one end, and the lightning arrester 1 has a T-shaped slot 103 with a closed bottom at one end. The connecting bolt 3 penetrates the T-shaped head 204 vertically along the axial direction of the wind turbine blade from the top end surface of the T-shaped head 204, and then locks and connects the T-shaped head 204 and the T-shaped slot 103. The cooperation between the T-shaped head 204 and the T-shaped slot 103 can achieve a similar limiting effect as the dovetail slot 102 and the dovetail tenon 202.

[0051] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wind turbine blade lightning arrester, comprising a connecting part (2) and a lightning arrester (1), wherein one end of the connecting part (2) is connected to the tip of the wind turbine blade and is connected to a cable, and the other end of the connecting part (2) is detachably connected to the lightning arrester (1), characterized in that: The lightning arrester (1) has at least one contact surface one (101), the connecting portion (2) has at least one contact surface two (201), and the connecting bolt (3) penetrates the contact surface one (101) and the contact surface two (201) so that the two are closely fitted to form a conductive surface (10).

2. The wind turbine blade lightning arrester according to claim 1, characterized in that: The contact surface one (101) and the contact surface two (201) are both planes perpendicular to the axial direction of the wind turbine blade. A groove (4) is provided on the connecting portion (2) or the lightning receiving portion (1). The connecting bolt (3) is placed in the groove (4) and penetrates through the contact surface one (101) and the contact surface two (201), and then the two are tightly fitted together to form a vertical conductive surface (10).

3. The wind turbine blade lightning arrester according to claim 1, characterized in that: The contact surface one (101) and the contact surface two (201) are both inclined surfaces that are not perpendicular to the axial direction of the wind turbine blade. A groove (4) is provided on the connecting portion (2) or the lightning receiving portion (1). The connecting bolt (3) is placed in the groove (4) and penetrates through the contact surface one (101) and the contact surface two (201), and then the two are tightly fitted together to form an inclined conductive surface (10).

4. The wind turbine blade lightning arrester according to claim 1, characterized in that: The contact surface one (101) and the contact surface two (201) are both step surfaces. A groove (4) is provided on the connection part (2) or the lightning receiving part (1). The connection bolt (3) is placed in the groove (4) and penetrates through the contact surface one (101) and the contact surface two (201), and then the two are tightly fitted together to form a step-shaped conductive surface (10).

5. The wind turbine blade lightning arrester according to any one of claims 1 to 4, characterized in that: The connecting portion (2) and the lightning receptor (1) further have mutually matching limiting surfaces (20); when the connecting portion (2) and the lightning receptor (1) are relatively separated along the axial direction of the wind turbine blade, the limiting surfaces (20) are closely fitted to each other to limit the relative separation of the connecting portion (2) and the lightning receptor (1).

6. The wind turbine blade lightning arrester according to claim 5, characterized in that: The connection portion (2) has a dovetail tenon (202) at one end, and the lightning connection portion (1) has a dovetail groove (102) at one end. When the dovetail tenon (202) is inserted into the dovetail groove (102), a limiting surface (20) that can fit closely to each other is provided. A groove (4) is provided above the dovetail groove (102). The connection bolt (3) is placed in the groove (4) and penetrates through the dovetail groove (102) along the axial direction of the wind turbine blade and enters the dovetail tenon (202), thereby locking and connecting the dovetail tenon (202) and the dovetail groove (102).

7. The wind turbine blade lightning arrester according to claim 5, characterized in that: The connection portion (2) has a dovetail tenon (202) at one end, and the lightning arrester portion (1) has a dovetail groove (102) at one end, wherein the dovetail groove (102) is closed at the bottom and open at the top, and the connection bolt (3) penetrates the dovetail tenon (202) vertically along the axial direction of the wind turbine blade from the top end surface of the dovetail tenon (202), thereby locking and connecting the dovetail tenon (202) and the dovetail groove (102).

8. The wind turbine blade lightning arrester according to claim 5, characterized in that: One end of the connecting portion (2) has a dovetail tenon (202), and one end of the lightning arrester portion (1) has a dovetail groove (102), the dovetail groove (102) is closed at the bottom and open at the top, one end of the dovetail tenon (202) is a wedge-shaped surface (203), a wedge-shaped top block (5) is placed in the dovetail groove (102) and fits the wedge-shaped surface (203), and after the connecting bolt (3) passes through the wedge-shaped top block (5), the dovetail groove (102) and the dovetail tenon (202) can be tightly fitted through the wedge-shaped top block (5).

9. The wind turbine blade lightning arrester according to claim 5, characterized in that: One end of the connecting portion (2) has a T-shaped head (204), and one end of the lightning arrester (1) has a T-shaped slot (103) with a closed bottom. The connecting bolt (3) penetrates the T-shaped head (204) vertically along the axial direction of the wind turbine blade from the top end surface of the T-shaped head (204), and then locks the T-shaped head (204) and the T-shaped slot (103) together.

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