Wind power blade body lightning arrester structure and installation method

Abstract

The invention relates to the technical field of wind power, in particular to a wind power blade body lightning arrester structure and an installation method. The base is arranged in the insulating layer, a first through hole is formed in the base, a second through hole is formed in the insulating layer, the first through hole is communicated with the second through hole, the central axis of the first through hole is the same as that of the second through hole, the first end cover and the second end cover are arranged at the two ends of the second through hole, and the insulating layer is connected to the blade. And the first flash disk and the second flash disk are connected with the base. Firstly, the first end cover or the second end cover can be found by forming holes in the blades, so that the position of the second through hole can be determined, the approximate position of the base can be determined, then the first end cover or the second end cover is punched, and the position of the first through hole can be found; and finally, the first flash disk and the second flash disk are positioned and mounted through the first through holes, so that the base can be accurately found under the condition that the insulating layer is not damaged, the flash disks are effectively connected with the base, the conductive effect is improved, and the damage to the blades is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power, and in particular to a lightning arrester structure for a wind power blade and an installation method thereof. Background Art

[0002] Lightning is one of the top ten disasters in nature. According to statistics, there are about 1 billion thunderstorms every year in the world, with an average of more than 300 lightning strikes per second. Wind turbines are tall buildings, and the blades are at the highest point of the wind turbines, which are at the greatest risk of being struck by lightning. Lightning protection measures need to be taken for the blades.

[0003] At present, the lightning protection system of wind turbine blades mainly arranges lightning rods on the surface of the blades to achieve lightning protection; then the lightning is directed to the ground through the down conductor and the tower grounding to dissipate. The blade lightning protection lightning protection system usually consists of a blade tip lightning rod and a blade body lightning rod. The blade body lightning rod is installed near the trailing edge during the blade production process, playing an important role in protecting the high-risk area of ​​lightning strikes at the tip of the blade. The blade body lightning rod includes a lightning rod for attracting lightning and a metal base of the blade body lightning rod installed inside the blade for connecting the lightning rod. Before the mold is closed, a metal base containing an insulating layer is arranged inside the blade, and the metal base is connected to the grounding wire through a conductor and a connector; after the blade is closed, the position of the base is detected from the outside by technical means such as a metal detector, and the blade shell is punched from the outside using a punching device to expose the metal base and then the blade body lightning rod is connected to the metal base.

[0004] The existing technology has the following problems: first, it is difficult to accurately confirm the position of the metal base from the outside, and the drilling position often deviates, which in turn causes damage to the blade shell; second, the drilling process lacks effective control means, and it is difficult to ensure that the drilling entry angle is perpendicular to the base. The lightning rod cannot form an effective surface contact with the base, resulting in an increase in the overall resistance of the lightning protection system; third, the existence of the insulating layer will hinder external observation of the metal base, causing difficulties in positioning, drilling and installation. Once an operational error occurs during the drilling process, the insulating layer will be damaged and difficult to repair, which will have a significant impact on the lightning protection system's lightning resistance capability.

[0005] Therefore, there is an urgent need for a wind turbine blade lightning arrester structure and installation method to solve the above technical problems. Summary of the invention

[0006] The purpose of the present invention is to provide a wind turbine blade body lightning arrester structure and installation method, which can accurately find the base without damaging the insulating layer, so that the lightning arrester is effectively connected to the base, improve the conductive effect, and reduce damage to the blade.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] A wind turbine blade body lightning arrester structure comprises: a base, an insulating layer, a first end cover, a second end cover, a blade, a first lightning connector and a second lightning connector, wherein the base is arranged in the insulating layer, one end of the base is provided with a first through hole, the insulating layer is provided with a second through hole, the base passes through the second through hole, the first through hole is connected to the second through hole, and the central axis of the first through hole is the same as the central axis of the second through hole, the first end cover and the second end cover are respectively arranged at the two ends of the second through hole and used to block the second through hole, both ends of the insulating layer are connected to the blade, the first lightning connector can pass through the blade and the first end cover in sequence to be connected to the base, and the second lightning connector can pass through the blade and the second end cover in sequence to be connected to the base.

[0009] As a preferred technical solution of the above-mentioned wind turbine blade body lightning arrester structure, the wind turbine blade body lightning arrester structure also includes a connecting piece, the connecting piece is passed through the first through hole, and both ends of the connecting piece are exposed on the blade, and the first lightning connector and the second lightning connector are respectively connected to the two ends of the connecting piece.

[0010] As a preferred technical solution of the above-mentioned wind turbine blade body lightning arrester structure, the connecting piece is a screw.

[0011] As a preferred technical solution of the above-mentioned wind turbine blade body lightning arrester structure, the first end cover and the second end cover are both provided with a positioning piece near the center of one end of the blade.

[0012] As a preferred technical solution of the above-mentioned wind turbine blade lightning arrester structure, the positioning piece is in a cross-shaped shape.

[0013] As a preferred technical solution of the above-mentioned wind turbine blade body lightning arrester structure, one end of the first lightning arrester disc and the second lightning arrester disc are both provided with a first curved surface, the blade is provided with a second curved surface, and the first curved surface can be fitted with the second curved surface.

[0014] As a preferred technical solution of the above-mentioned wind turbine blade body lightning arrester structure, the wind turbine blade body lightning arrester structure also includes a connecting rod, one end of which is connected to the base, and the other end of which is connected to the ground wire.

[0015] As a preferred technical solution of the above-mentioned wind turbine blade body lightning arrester structure, the second through hole is cylindrical.

[0016] An installation method for installing the wind turbine blade body lightning arrester structure described in any one of the above items, the installation method comprising:

[0017] S1: The base is arranged inside the insulating layer, two ends of the second through hole are respectively blocked with the first end cover and the second end cover, and the base is arranged inside the blade, and then molded;

[0018] S2: confirming the approximate position of the base through the pre-arranged marks, and using a hole opener to open a small hole on the surface of the blade to expose the first end cover or the second end cover, thereby locking the position of the center point of the second through hole;

[0019] S3: opening a hole at the center point of the first end cover or the second end cover on one side of the blade to expose the first through hole;

[0020] S4: insert a long drill bit into the first through hole and then drill a hole to expose the second through hole, repeat the same operation on the other side, and install the first flash connector and the second flash connector on both sides of the blade respectively.

[0021] As a preferred technical solution of the above-mentioned installation method, the installation method further includes:

[0022] S5: Use silica gel to seal the connection between the first flash connector, the second flash connector and the blade.

[0023] Beneficial effects of the present invention:

[0024] The present invention provides a wind turbine blade body lightning arrester structure. The wind turbine blade body lightning arrester structure comprises: a base, an insulating layer, a first end cover, a second end cover, a blade, a first lightning arrester and a second lightning arrester, the base is arranged in the insulating layer, one end of the base is provided with a first through hole, the insulating layer is provided with a second through hole, the base passes through the second through hole, the first through hole is connected to the second through hole, and the central axis of the first through hole is the same as the central axis of the second through hole, the first end cover and the second end cover are respectively arranged at the two ends of the second through hole, and are used to block the second through hole, both ends of the insulating layer are connected to the blade, the first lightning arrester can pass through the blade and the first end cover in sequence to connect to the base, and the second lightning arrester can pass through the blade and the second end cover in sequence to connect to the base. When installing the structure, the first end cover or the second end cover can be found by drilling a hole on the blade, so as to determine the position of the second through hole, and then the approximate position of the base can be determined. Then, the first end cover or the second end cover is punched to find the position of the first through hole. Finally, the first flash connector and the second flash connector are installed by positioning the first through hole. Compared with the prior art, the base can be accurately found without damaging the insulating layer, so that the flash connector is effectively connected to the base, the conductive effect is improved, and the damage to the blade is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0026] Figure 1 A schematic structural diagram of a wind turbine blade lightning arrester structure provided by an embodiment of the present invention;

[0027] Figure 2 A schematic structural diagram of an insulating layer provided in an embodiment of the present invention.

[0028] In the figure:

[0029] 1. Base; 11. First through hole; 2. Insulating layer; 21. Second through hole; 3. First end cover; 4. Second end cover; 5. Blade; 6. First flash connector; 7. Second flash connector; 8. Connector; 9. Connecting rod. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] like Figure 1 and Figure 2 As shown, the present invention provides a wind turbine blade body lightning arrester structure. The wind turbine blade body lightning arrester structure comprises: a base 1, an insulating layer 2, a first end cover 3, a second end cover 4, a blade 5, a first lightning arrester 6 and a second lightning arrester 7.

[0035] Specifically, the base 1 is arranged in the insulating layer 2, a first through hole 11 is arranged at one end of the base 1, and a second through hole 21 is arranged at the insulating layer 2. The base 1 passes through the second through hole 21, the first through hole 11 is connected with the second through hole 21, and the central axis of the first through hole 11 is the same as the central axis of the second through hole 21. The first end cover 3 and the second end cover 4 are respectively arranged at the two ends of the second through hole 21 and are used to seal the second through hole 21. Both ends of the insulating layer 2 are connected to the blade 5, the first flash connector 6 can pass through the blade 5 and the first end cover 3 in sequence to be connected to the base 1, and the second flash connector 7 can pass through the blade 5 and the second end cover 4 in sequence to be connected to the base 1. When installing the structure, the first end cover 3 or the second end cover 4 can be found by drilling a hole on the blade 5, so that the position of the second through hole 21 can be determined, and then the approximate position of the base 1 can be determined, and then the first end cover 3 or the second end cover 4 can be punched to find the position of the first through hole 11, and finally the first flash connector 6 and the second flash connector 7 are installed by positioning the first through hole 11. Compared with the prior art, the base 1 can be accurately found without damaging the insulating layer 2, so that the flash connector and the base 1 are effectively connected, the conductive effect is improved, and the damage to the blade 5 is reduced. Further, the second through hole 21 is cylindrical.

[0036] Optionally, the blade 5 is trapezoidal, the insulating layer 2 is trapezoidal, and the side wall of the insulating layer 2 is connected to the inner wall of the blade 5 .

[0037] Optionally, the wind turbine blade body lightning arrester structure further includes a connector 8, the connector 8 is inserted into the first through hole 11, and both ends of the connector 8 are exposed to the blade 5, and the first lightning connector 6 and the second lightning connector 7 are respectively connected to the two ends of the connector 8. Specifically, the side wall of the connector 8 is connected to the hole wall of the first through hole 11, which can lead the lightning of the first lightning connector 6 or the second lightning connector 7 to the base 1, and at the same time can improve the stability of the first lightning connector 6 and the second lightning connector 7.

[0038] Furthermore, the connecting member 8 is a screw rod, which can be threadedly connected to the first flash connector 6 and the second flash connector 7, so as to facilitate the installation and replacement of the first flash connector 6 or the second flash connector 7.

[0039] Optionally, the first end cap 3 and the second end cap 4 are both provided with a positioning piece at the center near one end of the blade 5. In this embodiment, the positioning piece is a positioning mark, which is convenient for the staff to expose the positioning mark when drilling a hole on the surface of the blade 5, and then lock the position of the center point of the second through hole 21. Of course, in some other embodiments, the positioning piece can also be provided separately.

[0040] Furthermore, the positioning piece is in a cross shape, which is convenient for staff to find.

[0041] Optionally, one end of the first flash connector 6 and the second flash connector 7 are both provided with a first curved surface, and the blade 5 is provided with a second curved surface. The first curved surface can fit with the second curved surface, so that the first flash connector 6 and the second flash connector 7 can fit tightly with both sides of the blade 5 respectively, thereby reducing wind resistance.

[0042] Optionally, the wind turbine blade body lightning arrester structure further includes a connecting rod 9, one end of which is connected to the base 1, and the other end of which is connected to the ground wire, so as to guide lightning from the base 1 to the ground to prevent damage to the wind turbine. Further, the connecting rod 9 is wrapped inside the insulating layer 2.

[0043] The present invention also provides an installation method for installing the wind turbine blade body lightning arrester structure in the above embodiment. The provision of the second through hole 21 can save more than 30% of the casting cost, significantly reduce the difficulty of drilling and operating during installation, and can reduce more than 20% of the operating time, greatly reducing the production cost and installation cost of the blade body lightning arrester system. At the same time, the problems of difficult positioning, difficult drilling, difficult drilling angle control, and difficult drill selection of the traditional base 1 after the blade 5 is molded are solved, and the operating difficulties are integrated into the product through prefabrication as much as possible, reducing the operating procedures after the blade 5 is molded, and improving the installation quality. The installation method includes:

[0044] S1: The base 1 is arranged inside the insulating layer 2, and the two ends of the second through hole 21 are respectively blocked with the first end cover 3 and the second end cover 4, and arranged inside the blade 5, and then molded;

[0045] S2: confirm the approximate position of the base 1 by means of pre-arranged marks or magnets, and use a hole opener to open a small hole on the surface of the blade 5 to expose a "M"-shaped positioning mark, thereby locking the position of the center point of the second through hole 21;

[0046] S3: Opening a hole at the center point of the first end cover 3 or the second end cover 4 on one side of the blade 5 to expose the first through hole 11;

[0047] S4: Insert a long drill bit into the first through hole 11 and then drill a hole to expose the second through hole 21. Repeat the same operation on the other side, install the first flash connector 6 and the second flash connector 7 on both sides of the blade 5 respectively, and tighten them with bolts.

[0048] Optionally, the installation method further includes S5: cleaning the installation area and the docking surface, and sealing the gap between the first and second flash connectors 6 and 7 and the blade 5 with silicone to fit the first curved surface with the second curved surface to reduce wind resistance.

[0049] In addition, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A wind turbine blade lightning arrester structure, characterized in that: include: A base (1), an insulating layer (2), a first end cover (3), a second end cover (4), a blade (5), a first flash connector (6) and a second flash connector (7), wherein the base (1) is arranged in the insulating layer (2), one end of the base (1) is provided with a first through hole (11), the insulating layer (2) is provided with a second through hole (21), the base (1) passes through the second through hole (21), the first through hole (11) is connected to the second through hole (21), and the central axis of the first through hole (11) is aligned with the central axis of the second through hole (21). The central axes of the two through holes (21) are the same; the first end cover (3) and the second end cover (4) are respectively arranged at the two ends of the second through hole (21) and are used to block the second through hole (21); both ends of the insulating layer (2) are connected to the blade (5); the first flash connector (6) can pass through the blade (5) and the first end cover (3) in sequence to be connected to the base (1); and the second flash connector (7) can pass through the blade (5) and the second end cover (4) in sequence to be connected to the base (1).

2. A wind turbine blade lightning arrester structure according to claim 1, characterized in that: The wind turbine blade body lightning arrester structure further comprises a connecting member (8), wherein the connecting member (8) is inserted into the first through hole (11), and both ends of the connecting member (8) are exposed outside the blade (5), and the first lightning connector (6) and the second lightning connector (7) are respectively connected to the two ends of the connecting member (8).

3. A wind turbine blade lightning arrester structure according to claim 2, characterized in that: The connecting member (8) is a screw.

4. A wind turbine blade lightning arrester structure according to claim 1, characterized in that: Positioning pieces are provided at the center of each of the first end cover (3) and the second end cover (4) close to one end of the blade (5).

5. A wind turbine blade lightning arrester structure according to claim 4, characterized in that: The positioning piece is in a cross shape.

6. A wind turbine blade lightning arrester structure according to any one of claims 1 to 5, characterized in that: One end of each of the first flash connector (6) and the second flash connector (7) is provided with a first curved surface, and the blade (5) is provided with a second curved surface, and the first curved surface can fit with the second curved surface.

7. A wind turbine blade lightning arrester structure according to any one of claims 1 to 5, characterized in that: The wind turbine blade body lightning arrester structure also includes a connecting rod (9), one end of the connecting rod (9) is connected to the base (1), and the other end of the connecting rod (9) is connected to a ground wire.

8. A wind turbine blade lightning arrester structure according to any one of claims 1 to 5, characterized in that: The second through hole (21) is cylindrical.

9. An installation method, characterized in that: The wind turbine blade body lightning arrester structure according to any one of claims 1 to 8 is installed, and the installation method comprises: S1: The base (1) is arranged inside the insulating layer (2), the two ends of the second through hole (21) are respectively blocked with the first end cover (3) and the second end cover (4), and the base (1) is arranged inside the blade (5), and then the mold is closed; S2: confirming the approximate position of the base (1) by means of pre-arranged marks, and using a hole opener to open a small hole on the surface of the blade (5) to expose the first end cover (3) or the second end cover (4), thereby locking the position of the center point of the second through hole (21); S3: opening a hole at the center point of the first end cover (3) or the second end cover (4) on one side of the blade (5) to expose the first through hole (11); S4: insert a long drill bit into the first through hole (11) and then drill a hole to expose the second through hole (21), repeat the same operation on the other side, and install the first flash connector (6) and the second flash connector (7) on both sides of the blade (5) respectively.

10. An installation method according to claim 9, characterized in that: The installation method further comprises: S5: Use silica gel to seal the connection between the first flash connector (6), the second flash connector (7) and the blade (5).

Images