Wind power blade with lightning protection system

Abstract

The invention relates to the technical field of wind power generation, in particular to a wind power blade with a lightning protection system. The blade comprises a blade body, the blade body is composed of a root and a shell, a metal net interlayer is arranged in the inner wall of the shell, a notch is formed in the end, away from the root, of the blade body, a lightning arrester is arranged in the notch, the lightning arrester and the metal net interlayer are connected through two connecting structures, and the two connecting structures are arranged in a central symmetry mode. And a sealing structure is arranged above the two connecting structures in a sliding manner. The lightning arrester is installed in the notch in the end, away from the root, of the blade body so that lightning current can be guided during lightning stroke, the lightning arrester can slide in the notch so that installation, disassembly and maintenance can be facilitated, the lower lock shell is fixedly connected with the blade body, the upper lock shell is arranged on the side, away from the root, of the lower lock shell, and the upper lock shell is fixedly connected with the lightning arrester. Through mutual insertion of the lower lock shell and the upper lock shell, quick connection of the lightning arrester and the blade main body is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a wind power blade with a lightning protection system. Background Art

[0002] As a renewable energy source, wind energy has developed rapidly in recent years and has been increasingly valued by various countries. my country's wind power generation capacity is also growing continuously. Wind turbines are generally located in high-lying areas, and wind turbine blades are at the highest position of the wind turbine, which is very easy to be struck by lightning. If the lightning protection system is not designed properly, the blades will not be protected. After the lightning strike, the blades will be severely damaged and the maintenance cost is extremely high. At present, the common lightning protection system for wind turbine blades is to lay the main cable inside the blade, and the main cable is connected to the internal base through the branch cable. The branch cable and the base are connected by wiring terminals. The base and the lightning receptor are connected by threaded connection, and the blade tip lightning receptor is connected to the main cable through the wiring terminal. However, there are the following problems: 1. The lightning receptor is connected to the base through threads, and drilling and tapping are required during installation, which is complicated to install, and the threads are easily melted by the high temperature of lightning strikes. 2. The blade tip lightning receptor is connected to the main cable through the wiring terminal, which cannot be disassembled and replaced after installation, which is not convenient for wind farm maintenance. Summary of the invention

[0003] The object of the present invention is to provide a wind turbine blade with a lightning protection system to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, a wind turbine blade with a lightning protection system is provided, comprising a blade body, wherein the blade body is composed of a root and an outer shell, a metal mesh interlayer is arranged in the inner wall of the outer shell, and a recess is opened at the end of the blade body away from the root, in which a lightning rod is arranged, characterized in that: the lightning rod is connected to the metal mesh interlayer through two connecting structures, the two connecting structures are arranged symmetrically with respect to the center, a sealing structure is slidingly arranged above the two connecting structures, the sealing structure seals the top of the connecting structure, and when the sealing structure rotates, the two connecting structures are driven to separate from each other to separate the lightning rod from the metal mesh interlayer, and when the lightning rod is connected to the metal mesh interlayer through the two connecting structures, the sealing structure is driven to slide downward.

[0005] As a further improvement of the present technical solution, the lightning rod is arranged to slide in the recess, and the connecting structure includes a lower lock shell fixedly connected to the blade body, an upper lock shell is arranged on the side of the lower lock shell away from the root, and the upper lock shell is fixedly connected to the lightning rod, and the lower lock shell and the upper lock shell are plugged into each other to connect the lightning rod and the blade body.

[0006] As a further improvement of the present technical solution, the interiors of the lower lock shell and the upper lock shell are fixedly connected with semicircular plates, and the two semicircular plates form a hollow cylinder when the lower lock shell and the upper lock shell are plugged into each other. The lower lock shell and the upper lock shell are arranged to be symmetrical around the axis center line of the hollow cylinder, and pointed lock tongues are arranged on the sides of the lower lock shell and the upper lock shell that are close to each other, and the ends of the two pointed lock tongues that are close to each other are arranged in a pointed shape. When the lower lock shell and the upper lock shell are plugged into each other, the two pointed lock tongues are driven to plug into each other and squeeze the inner wall of the lower lock shell or the upper lock shell where the other is located.

[0007] As a further improvement of the present technical solution, telescopic rods are hinged at the bottom of the lower lock shell and the upper lock shell, and the two telescopic rods are symmetrical around the axis of the hollow cylinder. A lock core is rotatably arranged inside the semicircular plate, and the two lock cores form a cylinder when the lower lock shell and the upper lock shell are plugged into each other.

[0008] As a further improvement of the present technical solution, a toggle rod is fixedly connected to the side wall of the lock core, and one end of the telescopic rod away from the lower lock shell or the upper lock shell is hinged at the middle section of the toggle rod. The swing of the toggle rod drives the telescopic rod to extend and retract, and at the same time drives the lock core to rotate so that the contact surfaces of the two lock cores are tilted. When the contact surfaces of the two lock cores are tilted, the lower lock shell and the upper lock shell are locked through the semicircular plate.

[0009] As a further improvement of the technical solution, the sealing structure is arranged on a baffle plate above the two upper locking shells, and the baffle plate slides up and down and seals the gap between the flasher and the blade body.

[0010] As a further improvement of the present technical solution, a spline shaft is fixedly connected to the bottom of the baffle, a rotating rod is arranged under the baffle, a telescopic base is fixedly installed at the center of the rotating rod, a tension spring is arranged inside the telescopic base, the tension spring pulls the spline shaft downward, a spline groove is opened on the side wall of the telescopic base, and when the baffle rotates, the spline shaft and the rotating rod are driven to rotate through the spline groove.

[0011] As a further improvement of the present technical solution, sliding grooves are provided at both ends of the rotating rod, and connecting pieces are provided in the sliding grooves. The connecting pieces are arranged in an inverted T shape, and the lower end of the connecting piece is hinged to the upper end of the toggle rod. When the baffle rotates, the rotating rod is driven to rotate. The rotating rod rotates to squeeze the connecting piece to swing, causing the two toggle rods to rotate, thereby driving the two lock cores to rotate.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. In the wind turbine blade with lightning protection system, the lower lock shell is fixedly connected to the blade body, and an upper lock shell is arranged on the side away from the root. The upper lock shell is fixedly connected to the lightning receptor. The lightning receptor and the blade body are quickly connected by plugging the lower lock shell and the upper lock shell together, so as to facilitate quick installation, maintenance, disassembly and overhaul.

[0014] 2. In the wind turbine blade with lightning protection system, the lower lock shell and the upper lock shell are connected to each other through plugging, and the metal mesh interlayer and the lightning rod are connected by threads, which avoids the high temperature corrosion of the threads due to lightning strikes, and thus avoids the problems that are not conducive to maintenance caused by this. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention;

[0017] Figure 3 It is an enlarged schematic diagram of the structure at A of the present invention;

[0018] Figure 4 This is one of the connection structure schematic diagrams of the present invention;

[0019] Figure 5 This is the second schematic diagram of the connection structure of the present invention;

[0020] Figure 6 It is one of the cross-sectional schematic diagrams of the connection structure of the present invention;

[0021] Figure 7 This is the second cross-sectional schematic diagram of the connection structure of the present invention.

[0022] The meaning of each number in the figure is:

[0023] 1. Blade body;

[0024] 2. Connecting structure; 21. Lower lock shell; 22. Telescopic rod; 23. Toggle rod; 24. Connecting piece; 25. Lock cylinder; 26. Pointed lock tongue; 27. Upper lock shell; 28. Semicircular plate;

[0025] 3. Lightning arrester;

[0026] 4. Sealing structure; 41. Baffle; 42. Rotating rod; 43. Telescopic base. DETAILED DESCRIPTION

[0027] 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.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] Example 1

[0030] See also Figure 1-Figure 7 As shown, the purpose of this embodiment is to provide a wind turbine blade with a lightning protection system, including a blade body 1. The blade body 1 is a main component of the wind turbine blade, and is composed of a root and an outer shell. A metal mesh interlayer is arranged in the inner wall of the outer shell to improve the conductivity of the blade, thereby facilitating the conduction of lightning current. A notch is provided at one end of the blade body 1 away from the root, and a lightning receptor 3 is arranged in the notch. The function of the lightning receptor 3 is to attract and conduct lightning current and reduce the damage to the blade caused by lightning strikes. The lightning receptor 3 is connected to the metal mesh interlayer through two connecting structures 2. The two connecting structures 2 are arranged in a central symmetric manner, and are used to connect the lightning receptor 3 to the metal mesh interlayer to ensure a stable connection between the lightning receptor 3 and the metal mesh interlayer. A sealing structure 4 is slidingly provided above the two connecting structures 2. The sealing structure 4 seals the top of the connecting structure 2 to seal the space above the 2 connecting structures to prevent moisture and dust from entering. When the sealing structure 4 rotates, it drives the two connecting structures 2 to separate from each other so that the lightning rod 3 is separated from the metal mesh interlayer, so as to achieve the purpose of rapid maintenance and overhaul. When the lightning rod 3 is connected to the metal mesh interlayer through the two connecting structures 2, it drives the sealing structure 4 to slide downward, thereby sealing the top of the two connecting structures 2, effectively extending the service life of the wind turbine blade. In order to ensure that the lightning current can be effectively conducted from the lightning rod 3 to the ground, a conductive path, such as a down conductor, is provided inside the blade to ensure the smooth conduction of the lightning current.

[0031] The metal mesh interlayer is laid along the main beam of the blade, and its width is slightly wider than the main beam. It is crimped with a copper plate after repeated folding to ensure the effective conduction of lightning current. The lightning receptor 3 is connected to the copper plate of the metal mesh interlayer, and the lightning receptor 3 is set to slide in the recess, so as to regularly check the status of the metal mesh interlayer and the lightning receptor 3, and carry out necessary maintenance and repair in time. The connection structure 2 includes a lower lock shell 21 fixedly connected to the blade body 1, and an upper lock shell 27 is arranged on the side of the lower lock shell 21 away from the root. The upper lock shell 27 is fixedly connected to the lightning receptor 3, and the lower lock shell 21 and the upper lock shell 27 are plugged into each other to connect the lightning receptor 3 and the blade body 1. When lightning strikes, this connection method can effectively conduct the lightning current from the lightning receptor 3 to the metal mesh interlayer of the blade body 1, thereby realizing lightning protection for the entire blade, abandoning the previous method of using threaded connection, thereby avoiding the easy melting of the thread due to high temperature caused by lightning strike, and thus avoiding the problems caused by this that are not conducive to maintenance.

[0032] The lower lock shell 21 and the upper lock shell 27 are both fixedly connected to the interior with a semicircular plate 28. When the lower lock shell 21 and the upper lock shell 27 are plugged into each other, the two semicircular plates 28 form a hollow cylinder. This structure plays a role of connection and stability. At the same time, as part of the conductive path, it ensures that the lightning current can be effectively conducted from the lightning receptor 3 to the metal mesh interlayer of the blade body 1. The lower lock shell 21 and the upper lock shell 27 are arranged to be symmetrical around the axis of the hollow cylinder. This symmetrical layout helps to evenly distribute the lightning current and reduce the risk of local overheating or damage. At the same time, it also ensures the stability and reliability of the structure. The lower lock shell 21 and the upper lock shell 27 are both provided with a side close to each other. The pointed lock tongue 26 reduces the friction area of ​​the lower lock shell 21 and the upper lock shell 27 when they are plugged in, which helps to achieve a tight connection between the lower lock shell 21 and the upper lock shell 27. At the same time, the ends of the two pointed lock tongues 26 that are close to each other are set to a pointed shape, which helps to better fix and seal when they are plugged in to each other. When the lower lock shell 21 and the upper lock shell 27 are plugged in to each other, the two pointed lock tongues 26 are driven to plug in to each other and squeeze the inner wall of the lower lock shell 21 or the upper lock shell 27 where the other party is located. This squeezing mechanism not only ensures the firmness of the connection, but also through the squeezing effect, it can improve the electrical contact quality of the conductive path, thereby improving the efficiency and reliability of the lightning protection system.

[0033] The bottom of the lower lock shell 21 and the upper lock shell 27 are hinged with a telescopic rod 22. This hinged design allows the telescopic rod 22 to move within a certain range, ensuring the flexibility and reliability of the structure. The telescopic rod 22 is set to automatically lock the lower lock shell 21 and the upper lock shell 27 when they are plugged into each other, thereby improving the efficiency of installation. The two telescopic rods 22 are symmetrical around the axis of the hollow cylinder. The inner rotation of the semicircular plate 28 is provided with a lock core 25. The two lock cores 25 form a cylinder when the lower lock shell 21 and the upper lock shell 27 are plugged into each other. When the two lock cores 25 are plugged into and squeezed with each other, they merge to form a complete cylindrical structure. This cylindrical structure The two semicircular plates 28 are locked inside. This cylindrical structure not only enhances the mechanical strength of the connection part, but also provides a continuous conductive path, which is conducive to the conduction of lightning current. A toggle rod 23 is fixedly connected to the side wall of the lock core 25. One end of the telescopic rod 22 away from the lower lock shell 21 or the upper lock shell 27 is hinged at the middle section of the toggle rod 23. The toggle rod 23 swings to drive the telescopic rod 22 to extend and retract, and at the same time drives the lock core 25 to rotate so that the contact surfaces of the two lock cores 25 are tilted. When the contact surfaces of the two lock cores 25 are tilted, the lower lock shell 21 and the upper lock shell 27 are locked through the semicircular plate 28, forming a firm connection and effectively conducting lightning current to protect the blades from damage.

[0034] The sealing structure 4 includes a baffle 41 arranged above the two upper locking shells 27. The baffle 41 slides up and down and seals the gap between the flasher 3 and the blade body 1, so that the surface of the blade body 1 remains smooth during rotation, thereby reducing wind resistance, which is beneficial to improving the wind power conversion rate of the wind turbine blades. At the same time, the sealing effect is also guaranteed to prevent moisture and dust from entering. The bottom of the baffle 41 is fixedly connected with a spline shaft, and a rotating rod 42 is arranged below the baffle 41. A telescopic base 43 is fixedly installed at the center of the rotating rod 42. A tension spring is arranged inside the telescopic base 43. The tension spring pulls the spline shaft downward, thereby adjusting the position of the baffle 41 to maintain the tightness and adaptability of the baffle 41. A spline groove is opened on the side wall of the telescopic base 43. When the baffle 41 rotates, the spline shaft and the rotating rod 42 are driven to rotate through the spline groove. This design allows the baffle 41 to drive the rotating rod 42 to rotate together when it rotates, thereby realizing dynamic adjustment of the baffle 41.

[0035] Slide grooves are provided at both ends of the rotating rod 42, and connecting members 24 are arranged in the slide grooves. This design allows the rotating rod 42 to move flexibly in the slide grooves, thereby driving other components to perform corresponding mechanical actions. The connecting member 24 is arranged in an inverted T shape, which helps to improve the stability of the connecting member 24 and provides multiple connection points to realize complex mechanical movements. The lower end of the connecting member 24 is hinged to the upper end of the toggle rod 23, so that the connecting member 24 can swing around the hinge point, thereby driving the telescopic rod 22 to perform telescopic actions. When the baffle 41 rotates, it drives the rotating rod 42 to rotate. The rotating rod 42 rotates to squeeze the connecting member 24 to swing, causing the two toggle rods 23 to rotate, thereby driving the two lock cores 25 to rotate. Through the rotation of the lock core 25, a close connection between the blade body 1 and the lightning arrester 3 can be achieved, while ensuring the reliability of the lightning protection system.

[0036] In the specific use of this embodiment, the lightning receptor 3 is installed in the notch at one end of the blade body 1 away from the root, so as to guide the lightning current when lightning strikes. The lightning receptor 3 can slide in the notch to facilitate installation and disassembly maintenance. The lower lock shell 21 is fixedly connected to the blade body 1, and an upper lock shell 27 is provided on the side away from the root. The upper lock shell 27 is fixedly connected to the lightning receptor 3. The lightning receptor 3 and the blade body 1 are quickly connected by plugging the lower lock shell 21 and the upper lock shell 27 together, so as to facilitate quick installation, maintenance and disassembly and overhaul. At the same time, the metal mesh interlayer and the lightning receptor 3 are connected by threads, which avoids the problem of screw thread. The grooves are melted by high temperature caused by lightning strikes, thereby avoiding the problems that are not conducive to maintenance. By setting two lock cores 25 and pointed lock tongues 26, it is ensured that the lightning current can be effectively transmitted from the lightning receptor 3 to the conductive path set inside the blade body 1 to ensure the smooth conduction of the lightning current. When maintenance is required, the baffle 41 is pulled upward and rotated, and the toggle rod 23 is driven by the rotating rod 42 to squeeze the lock core 25, so that the contact surface between the two lock cores 25 and the contact surface between the two semicircular plates 28 are kept horizontal, so that the lower lock shell 21 and the upper lock shell 27 can be quickly separated, thereby improving the efficiency of disassembly and maintenance.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A wind turbine blade with a lightning protection system, comprising a blade body (1), the blade body (1) consisting of a root and an outer shell, a metal mesh interlayer is arranged in the inner wall of the outer shell, a notch is provided at one end of the blade body (1) away from the root, a lightning receptor (3) is arranged in the notch, and the characteristics are: The lightning receptor (3) is connected to the metal mesh interlayer via two connection structures (2), the two connection structures (2) are arranged symmetrically with respect to the center, a sealing structure (4) is slidably arranged above the two connection structures (2), the sealing structure (4) seals the top of the connection structure (2), and when the sealing structure (4) rotates, it drives the two connection structures (2) to separate from each other, thereby separating the lightning receptor (3) from the metal mesh interlayer. When the lightning receptor (3) is connected to the metal mesh interlayer via the two connection structures (2), it drives the sealing structure (4) to slide downward.

2. The wind turbine blade with a lightning protection system according to claim 1, characterized in that: The lightning receptor (3) is arranged to slide in the recess, the connection structure (2) comprises a lower lock shell (21) fixedly connected to the blade body (1), an upper lock shell (27) is arranged on a side of the lower lock shell (21) away from the root, the upper lock shell (27) is fixedly connected to the lightning receptor (3), and the lower lock shell (21) and the upper lock shell (27) are plugged into each other to connect the lightning receptor (3) and the blade body (1).

3. The wind turbine blade with a lightning protection system according to claim 2, characterized in that: The lower lock shell (21) and the upper lock shell (27) are both fixedly connected with a semicircular plate (28) inside. When the lower lock shell (21) and the upper lock shell (27) are plugged into each other, the two semicircular plates (28) form a hollow cylinder. The lower lock shell (21) and the upper lock shell (27) are arranged to be symmetrical around the axis of the hollow cylinder. The lower lock shell (21) and the upper lock shell (27) are arranged with a pointed lock tongue (26) on one side close to each other. The two pointed lock tongues (26) are arranged in a pointed shape at one end close to each other. When the lower lock shell (21) and the upper lock shell (27) are plugged into each other, the two pointed lock tongues (26) are driven to plug into each other and squeeze the inner wall of the lower lock shell (21) or the upper lock shell (27) where the other is located.

4. The wind turbine blade with a lightning protection system according to claim 3, characterized in that: A telescopic rod (22) is hinged at the bottom of the lower lock shell (21) and the upper lock shell (27), and the two telescopic rods (22) are symmetrical around the axis of the hollow cylinder. A lock core (25) is rotatably arranged inside the semicircular plate (28), and the two lock cores (25) form a cylinder when the lower lock shell (21) and the upper lock shell (27) are plugged into each other.

5. The wind turbine blade with a lightning protection system according to claim 4, characterized in that: A toggle rod (23) is fixedly connected to the side wall of the lock core (25); one end of the telescopic rod (22) away from the lower lock shell (21) or the upper lock shell (27) is hinged to the middle section of the toggle rod (23); the toggle rod (23) swings to drive the telescopic rod (22) to extend and retract, and at the same time drives the lock core (25) to rotate so that the contact surfaces of the two lock cores (25) are tilted; when the contact surfaces of the two lock cores (25) are tilted, the lower lock shell (21) and the upper lock shell (27) are locked through the semicircular plate (28).

6. The wind turbine blade with a lightning protection system according to claim 4, characterized in that: The sealing structure (4) is arranged on a baffle (41) above the two upper locking shells (27); the baffle (41) slides up and down and seals the gap between the flasher (3) and the blade body (1).

7. The wind turbine blade with a lightning protection system according to claim 6, characterized in that: The bottom of the baffle (41) is fixedly connected with a spline shaft, a rotating rod (42) is arranged below the baffle (41), a telescopic base (43) is fixedly installed at the center of the rotating rod (42), a tension spring is arranged inside the telescopic base (43), the tension spring pulls the spline shaft downward, a spline groove is opened on the side wall of the telescopic base (43), and when the baffle (41) rotates, the spline shaft and the rotating rod (42) are driven to rotate through the spline groove.

8. The wind turbine blade with a lightning protection system according to claim 7, characterized in that: Slide grooves are provided at both ends of the rotating rod (42), and a connecting piece (24) is provided in the slide groove. The connecting piece (24) is arranged in an inverted T shape, and the lower end of the connecting piece (24) is hinged to the upper end of the toggle rod (23). When the baffle (41) rotates, the rotating rod (42) is driven to rotate. The rotating rod (42) rotates to squeeze the connecting piece (24) to swing, so that the two toggle rods (23) rotate, thereby driving the two lock cylinders (25) to rotate.

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