A noise reduction device for a blade of a wind power plant

Abstract

The embodiment of the present application provides a kind of wind power generation equipment blade noise reduction device, by the embodiment of the present application, when the blade of wind power generation equipment rotates, silencer ring arranged in connecting portion can effectively reduce the noise of motor transmission of wind power generation equipment, airflow passes through the sawtooth structure of front blade and forms tail vortex, cooperate with the tail vortex interaction of the tail vortex generated by comb flow assembly composed of comb flow main rod and comb flow inclined rod and cancel to realize the noise reduction of front blade, while air passes through tail blade and is cancelled by spoiler to realize the noise reduction of tail blade, and installation assembly and docking assembly are closely attached by first flange plate and second flange plate, reduce the gap between components, thereby reducing the noise generated when vibrating, by the mutual cooperation of the above components, the noise generated by fan blade rotation is overall noise reduction, effectively improve the use effect of blade.

Description

Technical Field

[0001] This invention relates to the field of wind turbine blade technology, and in particular to a blade noise reduction device for wind power generation equipment. Background Technology

[0002] Low-carbon, environmentally friendly, and sustainable energy solutions rely heavily on the widespread application of new energy power equipment, with wind power equipment being one of the more common types.

[0003] A wind turbine generator set consists of three parts: a wind turbine, a generator, and a tower. It uses wind power to generate aerodynamic force on the blades of the wind turbine to drive the wind turbine to rotate. The rotation speed is increased by a speed increaser to drive the generator to generate electricity. The wind turbine blades are the core components of the wind turbine generator set that convert natural wind energy into electrical energy. They are also the main basis for measuring the design and technical level of the wind turbine generator set.

[0004] During the rotation of wind turbine blades, airflow detaches from the trailing edge of the blades, generating vortices. Generally, large vortices produce low-frequency noise, while small vortices produce high-frequency noise. High-frequency noise attenuates more quickly with distance and obstacles, while low-frequency noise is more difficult to attenuate. Therefore, the performance of wind turbine blades is closely related to their noise reduction capabilities.

[0005] In related technologies, although adding serrated structures to the blades can change the position of the blade wake vortex generation and make the wake vortices interact with each other, thereby reducing noise during blade operation, it often can only reduce noise at the same frequency, resulting in poor noise reduction effect of wind turbine blades. Summary of the Invention

[0006] In view of the above problems, a blade noise reduction device for wind power generation equipment is proposed to overcome or at least partially solve the above problems, comprising:

[0007] A blade noise reduction device for a wind power generation equipment, the device comprising:

[0008] The fan shaft 1 and the main base 2 are coaxially connected to the fan shaft 1.

[0009] A first blade assembly 5 and a second blade assembly 6 are connected. One end of the first blade assembly 5 is connected to the main base 2 via a connecting part, and the other end is connected to the second blade assembly 6. The connecting part includes a mounting assembly 3 and a docking assembly 4. One end of the mounting assembly 3 is connected to the main base 2, and the other end is connected to one end of the docking assembly 4. The other end of the docking assembly 4 is connected to the first blade assembly 5. The mounting assembly 3 includes a mounting base 301 and a first flange 303. One end of the mounting base 301 is fixedly mounted to the main base 2, and the other end is welded to the first flange 303. A sound-absorbing ring 302 is nested on the outer surface of the mounting base 301. The first flange 303 has a fixing groove 305 and a first mounting hole 304. The docking assembly 4 includes... The first blade assembly 303 includes a second flange 401 and a second mounting hole 402, which are matched with the first mounting hole 304. A fixing block 405 is provided at one end of the second flange 401 near the mounting assembly 3. The fixing block 405 is used to embed into the fixing groove 305 so that the first flange 303 and the second flange 401 are fitted and fixed. The first blade assembly 5 includes a front blade 501. A plurality of serrated structures 502 are provided on one side of the front blade 501, and a combing main rod 503 is provided between adjacent serrated structures 502. Combing diagonal rods 504 are provided on both sides of the combing main rod 503. The second blade assembly 6 includes a tail blade 601. A baffle 602 is provided on the same side of the tail blade 601 and the serrated structures 502.

[0010] Optionally, the upper and lower surfaces of the spoiler 602 are provided with a plurality of spoiler grooves 603, and one end of the spoiler groove 603 away from the tail section blade 601 is connected to the guide groove 604.

[0011] Optionally, the device further includes a noise reduction diaphragm 7 covering the side of the first blade assembly 5 away from the serrated structure 502, and / or, the noise reduction diaphragm 7 covering the side of the second blade assembly 6 away from the spoiler 602.

[0012] Optionally, the fixing groove 305 is composed of at least three rectangular grooves, the centers of the at least three rectangular grooves coincide, and the included angle between adjacent rectangular grooves is equal. Each rectangular groove has a first mounting hole 304 at both ends, and the rectangular groove matches the fixing block 405.

[0013] Optionally, the noise-absorbing ring 302 has a straight pipe structure and is provided with multiple noise-absorbing holes.

[0014] Optionally, the connecting part further includes a bolt 403 and a nut 404, wherein the bolt 403 is used to pass through the first mounting hole 304 and the second mounting hole 402 and is fixed by the nut 404 so that the first flange 303 and the second flange 401 are fitted together.

[0015] Optionally, the inner wall of the fixing groove 305 is covered with a shock-absorbing membrane 306, the material of which includes polyurethane.

[0016] Optionally, the sawtooth structure 502 is made of fiberglass, and the noise reduction film 7 is made of polyurethane.

[0017] Optionally, the inner wall of the turbulence channel 603 may be made of a sound-insulating and damping material, and / or the inner wall of the flow guide channel 604 may be made of a sound-insulating and damping material.

[0018] A wind power generation device, the wind power generation device including the blade noise reduction device as described above.

[0019] The embodiments of the present invention have the following advantages: Through the embodiments of the present invention, when the blades of the wind power generation equipment rotate, the noise reduction ring 302 set in the connection part can effectively reduce the noise transmitted by the motor of the wind power generation equipment. The airflow forms a tail vortex after passing through the sawtooth structure 502 of the front blade 501. The tail vortex generated by the combing assembly composed of the combing main rod 503 and the combing inclined rod 504 interacts and cancels each other, thereby reducing the noise of the front blade 501. At the same time, when the air passes through the tail blade 601, it is canceled by the spoiler 602, thereby reducing the noise of the tail blade 601. Moreover, the installation assembly 3 and the docking assembly 4 reduce the gap between the components through the tight fit of the first flange 303 and the second flange 401, thereby reducing the noise generated during vibration. Through the cooperation of the above components, the noise generated by the rotation of the wind turbine blade is reduced as a whole, effectively improving the performance of the blade. Attached Figure Description

[0020] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a blade noise reduction device for a wind power generation equipment according to an embodiment of the present invention;

[0022] Figure 2 This is a structural schematic diagram of a first blade assembly and a second blade assembly according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of a sawtooth structure and a combing assembly provided in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of a spoiler structure provided in an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the installation component structure provided in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the docking component structure provided in an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the structural cooperation of the installation component and the docking component provided in an embodiment of the present invention.

[0028] Reference numerals: 1-Fan shaft; 2-Main base; 3-Mounting assembly; 301-Mounting base; 302-Silence ring; 303-First flange; 304-First mounting hole; 305-Fixing groove; 306-Shock-damping membrane; 4-Connecting assembly; 401-Second flange; 402-Second mounting hole; 403-Bolt; 404-Nut; 405-Fixing block; 5-First blade assembly; 501-Front blade; 502-Serrated structure; 503-Combing main rod; 504-Combing diagonal rod; 6-Second blade assembly; 601-Tail blade; 602-Break plate; 603-Breakout groove; 604-Guide groove; 7-Noise reduction membrane. Detailed Implementation

[0029] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0030] While some devices or measures exist for noise reduction in wind turbine blades, they suffer from the following drawbacks:

[0031] 1. Related technologies use serrated structures added to the trailing edge of the blade to change the position of the blade wake vortex generation. The wake vortices interact with each other, thereby reducing noise during blade operation. However, a single serrated structure can often only reduce noise at the same frequency, resulting in poor noise reduction effect of wind turbine blades.

[0032] 2. Due to the gap at the connection between the wind turbine blades and the motor shaft, noise is generated at the connection between the wind turbine blades and the motor shaft during operation, which in turn leads to excessive noise in the overall operation of the wind turbine.

[0033] 3. The rotation speed of wind turbine blades is often related to the installation angle of the wind turbine blades. Wind turbines are usually installed in different areas, and the wind resources in each area are also different. The installation angle of wind turbine blades often cannot be adjusted as needed, resulting in poor wind power utilization and failure to meet people's needs.

[0034] Based on this, the present invention proposes a blade noise reduction device for wind power generation equipment to overcome or partially overcome the aforementioned defects. The blade noise reduction device for wind power generation equipment provided by the present invention will be described in detail below.

[0035] An embodiment of the present invention provides a blade noise reduction device for wind power generation equipment, comprising:

[0036] The fan shaft 1 and the main base 2 are coaxially connected to the fan shaft 1.

[0037] In practical implementation, the wind turbine shaft is the output shaft of the motor in the wind power generation equipment, such as... Figure 1 As shown, the main base 2 is coaxially connected to the fan shaft 1.

[0038] A first blade assembly 5 and a second blade assembly 6 are connected. One end of the first blade assembly 5 is connected to the main base 2 via a connecting part, and the other end is connected to the second blade assembly 6. The connecting part includes a mounting assembly 3 and a docking assembly 4. One end of the mounting assembly 3 is connected to the main base 2, and the other end is connected to one end of the docking assembly 4. The other end of the docking assembly 4 is connected to the first blade assembly 5. The mounting assembly 3 includes a mounting base 301 and a first flange 303. One end of the mounting base 301 is fixedly mounted to the main base 2, and the other end is welded to the first flange 303. A sound-absorbing ring 302 is nested on the outer surface of the mounting base 301. The first flange 303 has a fixing groove 305 and a first mounting hole 304. The docking assembly 4 includes... The first blade assembly 303 includes a second flange 401 and a second mounting hole 402, which are matched with the first mounting hole 304. A fixing block 405 is provided at one end of the second flange 401 near the mounting assembly 3. The fixing block 405 is used to embed into the fixing groove 305 so that the first flange 303 and the second flange 401 are fitted and fixed. The first blade assembly 5 includes a front blade 501. A plurality of serrated structures 502 are provided on one side of the front blade 501, and a combing main rod 503 is provided between adjacent serrated structures 502. Combing diagonal rods 504 are provided on both sides of the combing main rod 503. The second blade assembly 6 includes a tail blade 601. A baffle 602 is provided on the same side of the tail blade 601 and the serrated structures 502.

[0039] In this embodiment, as Figure 1 As shown, one end of the first blade assembly 5 is connected to the main base 2 via a connecting part, and the other end is connected to the second blade assembly 6. The connecting part between the first blade assembly 6 and the main base 2 includes a mounting component 3 and a docking component 4. One end of the mounting component 3 is connected to the main base 2, and the other end is connected to one end of the docking component 4. The other end of the docking component 4 is connected to the first blade assembly 5.

[0040] In this embodiment, as Figure 5 As shown, the mounting assembly 3 includes a mounting base 301 and a first flange 303. One end of the mounting base 301 is fixedly mounted to the main base 2, and the other end is welded to the first flange 303. A noise-reducing ring 302 is nested on the outer surface of the mounting base 301. The first flange 303 has a fixing groove 305 and a first mounting hole 304. The noise-reducing ring 302 is used to reduce the noise transmitted by the motor of the wind power generation equipment.

[0041] In some embodiments of the present invention, the noise-absorbing ring 302 is a straight tube structure, and the noise-absorbing ring 302 is provided with a plurality of noise-absorbing holes.

[0042] In the specific implementation, the noise-absorbing ring 302 is a straight pipe structure, and multiple noise-absorbing holes can be provided on the outside of the noise-absorbing ring 302. The sound waves enter the pores of the porous material through the noise-absorbing ring 302, and the heat energy is dissipated by friction conversion, thereby weakening the sound waves and achieving the purpose of noise reduction for the noise generated by the wind turbine during operation.

[0043] In this embodiment, as Figure 6 As shown, the docking assembly 4 includes a second flange 401 and a second mounting hole 402, which matches the first mounting hole 304. A fixing block 405 is provided at one end of the second flange 401 near the mounting assembly 3. The fixing block 405 is used to embed into the fixing groove 305, so that the first flange 303 and the second flange 401 are fitted and fixed. The cooperation of the first mounting hole 304 and the second mounting hole 402, as well as the cooperation of the fixing block 405 and the fixing groove 305, ensures a tight connection between the docking assembly 4 and the mounting assembly 3, reducing gaps in the connection and facilitating the installation of the fan blades, thus improving the overall stability of the device.

[0044] In some embodiments of the present invention, the connecting part further includes a bolt 403 and a nut 404. The bolt 403 is used to pass through the first mounting hole 304 and the second mounting hole 402 and is fixed by the nut 404 so that the first flange 303 and the second flange 401 are fitted together.

[0045] In specific implementations, such as Figure 6 As shown, bolts 403 can be passed through the first mounting hole 304 and the second mounting hole 402 in sequence, and fixed by nuts 404, so that the first flange 303 and the second flange 401 can be further installed and fitted, thereby improving the connection stability of the mounting component 3 and the docking component 4.

[0046] In this embodiment, as Figure 2 As shown, the first blade assembly 5 includes a leading blade 501, and so on. Figure 2 Enlarged portion A Figure 3 As shown, multiple serrated structures 502 are provided on one side of the front blade 501. The serrated structures 502 can be triangular structures made of fiberglass. A combing main rod 503 is provided between adjacent serrated structures 502, and combing inclined rods 504 are provided on both sides of the combing main rod 503. By providing multiple serrated structures 502 on the front blade 501, and combining them with the combing assembly composed of the staggered combing main rods 503 and combing inclined rods 504, different tail vortices can be generated when the wind turbine blade rotates, thereby canceling each other out and achieving the purpose of noise reduction of the wind turbine blade, thus improving the noise reduction effect of the wind turbine blade.

[0047] In practical applications, such as Figure 3As shown, multiple diagonal combs 504 arranged in ascending order of length can be configured on both sides of the main combing rod 503. The ends of the diagonal combs 504 away from the main combing rod 503 are all flush with the tail end of the main combing rod 503, and the tail end of the main combing rod 503 is flush with the tip of the sawtooth structure 502. By coordinating the main combing rod 503 with the diagonal combs 504 on both sides, the airflow is combed, thereby forming tail vortices of different sizes, which can cancel each other out, thus achieving noise reduction.

[0048] In this embodiment, as Figure 1 As shown, the second blade assembly 6 includes a tail blade 601, and a baffle 602 is provided on the same side as the tail blade 601 and the sawtooth structure 502. The baffle 602 is used to adjust the direction of the combined airflow and cancel the airflow, thereby achieving the noise reduction effect on the wind turbine blades.

[0049] In some embodiments of the present invention, the upper and lower surfaces of the spoiler 602 are provided with a plurality of spoiler grooves 603, and one end of the spoiler groove 603 away from the tail section blade 601 is connected to the guide groove 604.

[0050] In specific implementations, such as Figure 2 Enlarged part B Figure 4 As shown, multiple turbulence grooves 603 can be uniformly embedded in the upper and lower surfaces of the spoiler 602, and the tail end of the turbulence grooves 603 gradually increases. The turbulence grooves 603, together with the guide grooves 604, make the tail vortex formed on the upper and lower surfaces of the tail blades 601 cancel each other out at the tail end, thereby adjusting the direction of the merging airflow and achieving a better noise reduction effect on the fan blades.

[0051] In some embodiments of the present invention, the inner wall of the turbulence channel 603 is made of a sound-insulating and damping material, and / or the inner wall of the flow guide channel 604 is made of a sound-insulating and damping material.

[0052] In practical applications, sound-insulating damping materials can provide better sound insulation, thereby improving the noise reduction effect on the fan blades.

[0053] In some embodiments of the present invention, the fixing groove 305 is composed of at least three rectangular grooves, the centers of the at least three rectangular grooves coincide, and the included angle between adjacent rectangular grooves is equal. Each rectangular groove is provided with the first mounting hole 304 at both ends, and the rectangular groove matches the fixing block 405.

[0054] In specific implementations, such as Figure 7As shown, the fixing groove 305 consists of at least three rectangular grooves, the centers of the at least three rectangular grooves coincide, and the included angle between adjacent rectangular grooves is equal. Each rectangular groove has a first mounting hole 304 at both ends, and the rectangular groove matches the fixing block 405. By inserting the fixing block 405 into the fixing groove 305 formed by the three rectangular grooves, the installation requirements of different angles of the wind turbine blades can be met. This makes it easy to adjust the angle of the wind turbine blades according to environmental requirements, improve the utilization rate of wind power, and increase the effect of the wind turbine.

[0055] In practical applications, such as Figure 7 As shown, each rectangular groove can be provided with a first mounting hole 304 at both the upper and lower ends, and the straight-line distance between the first mounting hole 304 and the fixing groove 305 is the same as the straight-line distance between the second mounting hole 402 and the fixing block 405. The fan blades are installed by fitting and fixing the first flange 303 and the second flange 401 together, and by having the mounting holes 304 and the second mounting holes 402 correspond one-to-one. This can effectively reduce the gap between the fan blades and the mounting base 301, and avoid excessive noise caused by vibration of the fan blades during operation due to excessive gap.

[0056] In some embodiments of the present invention, the inner wall of the fixing groove 305 is covered with a shock-absorbing membrane 306, and the material of the shock-absorbing membrane 306 includes polyurethane.

[0057] In specific implementations, such as Figure 5 As shown, the inner wall of the fixing groove 305 is covered with a damping membrane 306, and the damping membrane 306 is made of polyurethane.

[0058] In practical applications, the damping membrane 306 is set on the inner wall of the fixing groove 305 and the outer wall of the fixing block 405. By adding the damping membrane 306 made of polyurethane between the fixing groove 305 and the fixing block 405, the noise generated at the connection point of the fan blades during operation can be soundproofed. At the same time, the high damping properties of polyurethane can also effectively reduce the noise generated by the vibration of the fan blades.

[0059] In some embodiments of the present invention, the device further includes a noise reduction diaphragm 7 covering the side of the first blade assembly 5 away from the serrated structure 502, and / or, the noise reduction diaphragm 7 covering the side of the second blade assembly 6 away from the spoiler 602.

[0060] In specific implementations, such as Figure 1 or Figure 2As shown, the noise reduction film 7 covers the side of the first blade assembly 5 away from the serrated structure 502, and / or, the noise reduction film 7 covers the side of the second blade assembly 6 away from the spoiler 602. By adding the noise reduction film 7, the noise generated by the friction between the blade and the air is reduced. At the same time, the polyurethane material can also greatly increase the corrosion resistance of the wind turbine blade and improve the service life of the wind turbine blade.

[0061] In some embodiments of the present invention, the sawtooth structure 502 is made of glass fiber, and the noise reduction film 7 is made of polyurethane.

[0062] Some embodiments of the present invention also provide a wind power generation device, which includes the blade noise reduction device of the wind power generation device as described above.

[0063] The embodiments of the present invention have the following advantages: The blade noise reduction device for wind power generation equipment provided in the embodiments of the present invention includes: a wind turbine shaft 1 and a main base 2, the main base 2 being coaxially connected to the wind turbine shaft 1; a first blade assembly 5 and a second blade assembly 6, one end of the first blade assembly 5 being connected to the main base 2 through a connecting part, and the other end being connected to the second blade assembly 6; the connecting part is provided with a sound-absorbing ring 302; the first blade assembly 5 includes a front blade 501, one side of the front blade 501 is provided with a plurality of serrated structures 502, and a combing main rod 503 is provided between adjacent serrated structures 502, and combing inclined rods 504 are provided on both sides of the combing main rod 503; the second blade assembly 6 includes a tail blade 601, and a spoiler 602 is provided on the same side of the tail blade 601 and the serrated structures 502. When the blades of the wind turbine rotate, the noise transmitted by the motor of the wind turbine can be effectively reduced by the noise-absorbing ring 302 set in the connection part. The airflow forms a tail vortex by passing through the sawtooth structure 502 of the front blade 501. The tail vortex generated by the combing assembly composed of the combing main rod 503 and the combing inclined rod 504 interacts and cancels each other out, thereby reducing the noise of the front blade 501. At the same time, when the air passes through the tail blade 601, it is canceled by the spoiler 602, thereby reducing the noise of the tail blade 601. In this way, the noise generated by the rotation of the wind turbine blade is reduced as a whole, which effectively improves the performance of the blade.

[0064] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

[0065] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0066] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes the aforementioned element.

[0067] The above provides a detailed description of a blade noise reduction device for wind power generation equipment. Specific examples have been used to illustrate the principle and implementation of the invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the invention. Therefore, the content of this specification should not be construed as a limitation of the invention.

Claims

1. A wind turbine blade noise reduction device, characterized in that, The device comprises: a fan shaft (1) and a main base (2) coaxially connected with the fan shaft (1); a first blade assembly (5) and a second blade assembly (6), one end of the first blade assembly (5) is connected with the main base (2) through a connecting part, and the other end is connected with the second blade assembly (6); the connecting part comprises a mounting assembly (3) and a butt joint assembly (4), one end of the mounting assembly (3) is connected with the main base (2), and the other end is connected with one end of the butt joint assembly (4), the other end of the butt joint assembly (4) is connected with the first blade assembly (5); the mounting assembly (3) comprises a mounting base (301) and a first flange plate (303), one end of the mounting base (301) is fixedly mounted with the main base (2), and the other end is welded with the first flange plate (303); a sound insulation ring (302) is nested and mounted on the outer surface of the mounting base (301), the first flange plate (303) is embedded with a fixing groove (305) and is provided with a first mounting hole (304); the butt joint assembly (4) comprises a second flange plate (401) and a second mounting hole (402), the second mounting hole (402) is matched with the first mounting hole (304), and the second flange plate (401) is provided with a fixing block (405) close to one end of the mounting assembly (3), the fixing block (405) is used for embedding in the fixing groove (305), so that the first flange plate (303) and the second flange plate (401) are fixedly attached; the first blade assembly (5) comprises a front blade (501), a plurality of sawtooth structures (502) are arranged on one side of the front blade (501), a comb flow main rod (503) is arranged between adjacent sawtooth structures (502), and comb flow inclined rods (504) are arranged on both sides of the comb flow main rod (503); the second blade assembly (6) comprises a tail blade (601), and a spoiler (602) is arranged on the same side of the tail blade (601) and the sawtooth structure (502).

2. The apparatus of claim 1, wherein, The upper surface and the lower surface of the spoiler (602) are provided with a plurality of turbulence grooves (603), and one end of the turbulence grooves (603) away from the tail blade (601) is connected with a flow guide groove (604).

3. The apparatus of claim 1 or 2, wherein, The device further comprises a noise reduction film (7), the noise reduction film (7) covers one side of the first blade assembly (5) away from the sawtooth structure (502), and / or the noise reduction film (7) covers one side of the second blade assembly (6) away from the spoiler (602).

4. The apparatus of claim 1, wherein, The fixing groove (305) is composed of at least three rectangular grooves, the centers of the at least three rectangular grooves coincide, the included angles between adjacent rectangular grooves are equal, and the first mounting hole (304) is arranged at both ends of each rectangular groove, and the rectangular groove is matched with the fixing block (405).

5. The apparatus of claim 1, wherein, The sound attenuation ring (302) is a straight pipe structure, and a plurality of sound attenuation holes are arranged on the sound attenuation ring (302).

6. The apparatus of claim 1, wherein, The connecting part further comprises a bolt (403) and a nut (404), the bolt (403) is used for penetrating through the first mounting hole (304) and the second mounting hole (402) and is fixed by the nut (404), so that the first flange plate (303) and the second flange plate (401) are mounted and attached.

7. The apparatus of claim 1, wherein, The inner wall of the fixing groove (305) is covered with a damping film (306), and the material of the damping film (306) comprises polyurethane material.

8. The apparatus of claim 3, wherein, The material of the sawtooth structure (502) comprises glass fiber material, and the material of the noise reduction film (7) comprises polyurethane material.

9. The apparatus of claim 2, wherein, The material of the inner wall of the spoiler groove (603) comprises sound insulation damping material, and / or the material of the inner wall of the flow guide groove (604) comprises sound insulation damping material.

10. A wind power plant, characterized in that The wind power generation equipment comprises the blade noise reduction device of the wind power generation equipment according to any one of claims 1-9.

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