Blade noise reduction device of wind power generation equipment

Abstract

According to the blade noise reduction device of the wind power generation equipment, when the blades of the wind power generation equipment rotate, the noise reduction ring arranged on the connecting part can effectively reduce noise transmitted by a motor of the wind power generation equipment, airflow passes through the sawtooth structure of the front-section blade to form a trailing vortex, and the noise is reduced. The noise reduction of the front-section blade is realized by cooperating with the interaction and offset of trailing vortexes generated by a comb flow assembly consisting of a comb flow main rod and a comb flow inclined rod, and meanwhile, the noise reduction of the tail-section blade is realized by offsetting the air by a spoiler when the air passes through the tail-section blade; and in addition, gaps between the mounting assembly and the butt joint assembly are reduced through tight attachment of the first flange plate and the second flange plate, so that noise generated during vibration is reduced, overall noise reduction on the noise generated during rotation of the fan blade is achieved through mutual cooperation of the components, and the use effect of the blade is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine blades, and in particular to a blade noise reduction device for wind power generation equipment. Background Art

[0002] Low-carbon, environmentally friendly and sustainable energy solutions are inseparable from the widespread application of new energy power equipment, and wind power generation equipment is one of the more common ones.

[0003] The wind turbine of a wind power generation equipment consists of three parts: a wind rotor, a generator and a tower. The wind force is used to generate aerodynamic force on the wind rotor blades to drive the wind rotor to rotate, and then the speed of rotation is increased through the speed increaser to enable the generator to generate electricity. The wind turbine blades are the core components of the wind turbine that convert natural wind energy into electricity for the wind turbine generator set, and are also the main basis for measuring the design and technical level of the wind turbine set.

[0004] When wind turbine blades rotate, air flows off the trailing edge of the blades to generate vortices. Generally, large vortices generate low-frequency noise, while small vortices generate high-frequency noise. High-frequency noise decays faster with distance and obstacles, while low-frequency noise is more difficult to decay. Therefore, the effectiveness of wind turbine blades is closely related to the noise reduction effect of wind turbine blades.

[0005] In the related art, although a serrated structure is added to the blade to change the position of the blade tail vortex generation and enable the tail vortices to interact with each other, thereby achieving noise reduction during blade operation, it can often only reduce noise of the same frequency, resulting in poor noise reduction effect on wind turbine blades. Summary of the invention

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

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

[0008] A fan shaft 1 and a main base 2, wherein the main base 2 is coaxially connected to the fan shaft 1;

[0009] The first blade assembly 5 and the second blade assembly 6, one end of the first blade assembly 5 is connected to the main base 2 through a connecting portion, and the other end is connected to the second blade assembly 6; the connecting portion 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, and 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 on the main base 2, and the other end is welded to the first flange 303; a silencer ring 302 is nested on the outer surface of the mounting base 301, and a fixing groove 305 is embedded in the first flange 303 and a first mounting hole 304 is provided; the docking assembly 4 includes a mounting base 301 and a first flange 303. The invention comprises a second flange 401 and a second mounting hole 402, wherein the second mounting hole 402 matches the first mounting hole 304, and a fixing block 405 is provided at one end of the second flange 401 close to the mounting assembly 3, and the fixing block 405 is used to be embedded in the fixing groove 305 so that the first flange 303 and the second flange 401 are fitted and fixed; the first blade assembly 5 comprises a front blade 501, and a plurality of sawtooth structures 502 are provided on one side of the front blade 501, and a combing main rod 503 is provided between adjacent sawtooth structures 502, and combing oblique rods 504 are provided on both sides of the combing main rod 503; the second blade assembly 6 comprises a tail blade 601, and a spoiler 602 is provided on the same side of the tail blade 601 and the sawtooth structure 502.

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

[0011] Optionally, the device further comprises a noise reduction membrane 7 , which covers a side of the first blade assembly 5 away from the sawtooth structure 502 , and / or the noise reduction membrane 7 covers a 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 angles between adjacent rectangular grooves are equal, each of the two ends of the rectangular groove is respectively provided with the first mounting hole 304, and the rectangular groove matches the fixing block 405 with each other.

[0013] Optionally, the silencer ring 302 is a straight tube structure, and a plurality of silencer holes are provided on the silencer ring 302 .

[0014] Optionally, the connection portion further includes a bolt 403 and a nut 404, wherein the bolt 403 is used to penetrate the first mounting hole 304 and the second mounting hole 402 and be fixed by the nut 404, so that the first flange 303 and the second flange 401 are installed and fit together.

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

[0016] Optionally, the material of the sawtooth structure 502 includes glass fiber material, and the material of the noise reduction membrane 7 includes polyurethane material.

[0017] Optionally, the material of the inner wall of the spoiler groove 603 includes a sound insulation and damping material, and / or the material of the inner wall of the guide groove 604 includes a sound insulation and damping material.

[0018] A wind power generation equipment comprises the blade noise reduction device of the wind power generation equipment as described above.

[0019] The embodiment of the present invention has the following advantages: through the embodiment of the present invention, when the blades of the wind power generation equipment rotate, the silencer ring 302 arranged at the connection part can effectively reduce the noise transmitted by the motor of the wind power generation equipment, and the airflow passes through the sawtooth structure 502 of the front blade 501 to form a tail vortex, and the tail vortices generated by the comb flow assembly composed of the comb flow main rod 503 and the comb flow inclined rod 504 interact and offset each other to achieve noise reduction of the front blade 501, and at the same time, when the air passes through the tail blade 601, it is offset by the spoiler 602 to achieve noise reduction of the tail blade 601, and the installation component 3 and the docking component 4 reduce the gap between the components through the close fit of the first flange 303 and the second flange 401, thereby reducing the noise generated during vibration, and the mutual cooperation of the above-mentioned components can achieve overall noise reduction of the noise generated by the rotation of the fan blades, effectively improving the use effect of the blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0021] Figure 1 It is a schematic structural diagram of a blade noise reduction device for a wind power generation equipment provided by an embodiment of the present invention;

[0022] Figure 2 It is a structural schematic diagram of a first blade assembly and a second blade assembly structure provided by an embodiment of the present invention;

[0023] Figure 3 It is a structural schematic diagram of a sawtooth structure and a comb flow assembly provided by one embodiment of the present invention;

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

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

[0026] Figure 6 It is a schematic diagram of the structure of a docking assembly provided by an embodiment of the present invention;

[0027] Figure 7 It is a schematic diagram of the structural coordination of the installation component and the docking component provided in one embodiment of the present invention.

[0028] Figure markings: 1-fan shaft; 2-main base; 3-installation assembly; 301-installation base; 302-silencer ring; 303-first flange; 304-first mounting hole; 305-fixing groove; 306-shock-absorbing membrane; 4-docking 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 oblique rod; 6-second blade assembly; 601-tail blade; 602-spoiler; 603-spoiler groove; 604-guide groove; 7-noise reduction membrane. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all 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.

[0030] In the related art, although there are devices or measures for reducing the noise of wind power equipment blades, there are the following defects:

[0031] 1. The related technology uses a sawtooth structure to change the position of the blade tail vortex generation by adding a sawtooth structure at the trailing edge of the blade. The tail vortices interact with each other to achieve noise reduction during blade operation. However, a single sawtooth structure can only reduce noise of the same frequency, resulting in poor noise reduction effect of wind turbine blades.

[0032] 2. There is a gap between the connection between the wind turbine blades and the motor shaft, which causes a certain amount of noise to be generated at the connection between the wind turbine blades and the motor shaft during the rotation process, which in turn causes the wind turbine to make too much noise during operation;

[0033] 3. The rotation rate 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 according to needs, resulting in poor wind utilization and failure to meet people's usage needs.

[0034] Based on this, the present invention proposes a blade noise reduction device for a wind power generation equipment to overcome or partially overcome the above-mentioned defects. The blade noise reduction device for a 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] A fan shaft 1 and a main base 2, wherein the main base 2 is coaxially connected to the fan shaft 1;

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

[0038] The first blade assembly 5 and the second blade assembly 6, one end of the first blade assembly 5 is connected to the main base 2 through a connecting portion, and the other end is connected to the second blade assembly 6; the connecting portion 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, and 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 on the main base 2, and the other end is welded to the first flange 303; a silencer ring 302 is nested on the outer surface of the mounting base 301, and a fixing groove 305 is embedded in the first flange 303 and a first mounting hole 304 is provided; the docking assembly 4 includes a mounting base 301 and a first flange 303. The invention comprises a second flange 401 and a second mounting hole 402, wherein the second mounting hole 402 matches the first mounting hole 304, and a fixing block 405 is provided at one end of the second flange 401 close to the mounting assembly 3, and the fixing block 405 is used to be embedded in the fixing groove 305 so that the first flange 303 and the second flange 401 are fitted and fixed; the first blade assembly 5 comprises a front blade 501, and a plurality of sawtooth structures 502 are provided on one side of the front blade 501, and a combing main rod 503 is provided between adjacent sawtooth structures 502, and combing oblique rods 504 are provided on both sides of the combing main rod 503; the second blade assembly 6 comprises a tail blade 601, and a spoiler 602 is provided on the same side of the tail blade 601 and the sawtooth structure 502.

[0039] In this embodiment, if Figure 1 As shown, one end of the first blade assembly 5 is connected to the main base 2 through a connecting portion, and the other end is connected to the second blade assembly 6. The connecting portion between the first blade assembly 6 and the main base 2 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.

[0040] In this embodiment, if 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 on the main base 2, and the other end is welded to the first flange 303. The silencer ring 302 is nested and mounted on the outer surface of the mounting base 301. The first flange 303 is embedded with a fixing groove 305 and is provided with a first mounting hole 304. The silencer 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 silencer ring 302 is a straight tube structure, and a plurality of silencer holes are disposed on the silencer ring 302 .

[0042] In a specific implementation, the silencer ring 302 is a straight tube structure, and a plurality of silencer holes may be provided on the outside of the silencer ring 302. The silencer ring 302 allows sound waves to enter the pores of the porous material and be converted into heat energy by friction and dissipated, thereby weakening the sound waves and achieving the purpose of reducing the noise generated during the operation of the wind turbine.

[0043] In this embodiment, if Figure 6 As shown, the docking assembly 4 includes a second flange 401 and a second mounting hole 402, and the second mounting hole 402 matches the first mounting hole 304; a fixing block 405 is provided at one end of the second flange 401 close to the mounting assembly 3, and the fixing block 405 is used to be embedded in the fixing groove 305, so that the first flange 303 and the second flange 401 are fitted and fixed. With the cooperation of the first mounting hole 304 and the second mounting hole 402 and the cooperation of the fixing block 405 and the fixing groove 305, the docking assembly 4 and the mounting assembly 3 are tightly connected, the gap of the connection part is reduced, and the fan blades are easily installed, thereby improving the overall stability of the device.

[0044] In some embodiments of the present invention, the connecting portion further includes a bolt 403 and a nut 404, wherein the bolt 403 is used to penetrate the first mounting hole 304 and the second mounting hole 402 and be fixed by the nut 404 so that the first flange 303 and the second flange 401 are installed and fit together.

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

[0046] In this embodiment, if Figure 2 As shown, the first blade assembly 5 includes a front blade 501, and Figure 2 The enlarged part A Figure 3 As shown, a plurality of sawtooth structures 502 are provided on one side of the front blade 501, and the sawtooth structures 502 may be triangular structures made of glass fiber, and a combing flow main rod 503 is provided between adjacent sawtooth structures 502, and combing flow oblique rods 504 are provided on both sides of the combing flow main rod 503. By providing a plurality of sawtooth structures 502 on the front blade 501, and coordinating the combing flow components composed of the staggered combing flow main rods 503 and the combing flow oblique rods 504, different tail vortices can be generated when the fan blades rotate, thereby making the tail vortices cancel each other, achieving the purpose of reducing the noise of the fan blades, and improving the noise reduction effect of the fan blades.

[0047] In practical applications, such as Figure 3As shown, the two sides of the comb flow main rod 503 can be set to multiple comb flow oblique rods 504 arranged in sequence from short to long, and the ends of the comb flow oblique rods 504 away from the comb flow main rod 503 are flush with the tail end of the comb flow main rod 503, and the tail end of the comb flow main rod 503 is flush with the tip of the sawtooth structure 502; the airflow is combed by the comb flow main rod 503 cooperating with the comb flow oblique rods 504 on both sides, thereby forming tail vortices of different sizes, so that the tail vortices can offset each other, thereby achieving noise reduction.

[0048] In this embodiment, if Figure 1 As shown, 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 sawtooth structure 502. The spoiler 602 is used to adjust the direction of the combined airflow and offset the airflow to achieve a noise reduction effect on the fan blades.

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

[0050] In the specific implementation, Figure 2 The enlarged version of part B Figure 4 As shown, the upper and lower surfaces of the spoiler 602 can be evenly embedded with multiple spoiler grooves 603, and the tail ends of the spoiler grooves 603 gradually increase in size. The spoiler grooves 603 cooperate with the guide grooves 604 to allow the tail vortices formed on the upper and lower surfaces of the tail blades 601 to offset each other at the tail, thereby adjusting the direction of the combined airflow and better achieving the noise reduction effect on the fan blades.

[0051] In some embodiments of the present invention, the material of the inner wall of the spoiler groove 603 includes a sound insulation and damping material, and / or the material of the inner wall of the guide groove 604 includes a sound insulation and damping material.

[0052] In practical applications, sound insulation and damping materials can provide better sound insulation effects to enhance the noise reduction effect on 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 angles between adjacent rectangular grooves are equal, each of the two ends of the rectangular groove is respectively provided with the first mounting hole 304, and the rectangular groove matches the fixing block 405 with each other.

[0054] In the specific implementation, Figure 7As shown, the fixing groove 305 is composed of at least three rectangular grooves, the centers of at least three rectangular grooves coincide, and the angles between adjacent rectangular grooves are equal, and a first mounting hole 304 is respectively provided at both ends of each rectangular groove, and the rectangular groove and the fixing block 405 match each other. The method of inserting the fixing block 405 into the fixing groove 305 formed by three rectangular grooves can meet the installation requirements of different angles of the fan blades, and it is convenient to adjust the angle of the fan blades according to environmental requirements, improve the utilization rate of wind force, and increase the effect of the wind turbine.

[0055] In practical applications, such as Figure 7 As shown, a first mounting hole 304 can be provided at both ends of the upper and lower ends of each rectangular groove, 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, and the mounting holes 304 and the second mounting holes 402 correspond one to one, which can effectively reduce the gap between the fan blades and the mounting base 301, and avoid excessive noise caused by the 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 film 306 , and the material of the shock-absorbing film 306 includes polyurethane material.

[0057] In the specific implementation, Figure 5 As shown, the inner wall of the fixing groove 305 is covered with a shock-absorbing film 306 , and the material of the shock-absorbing film 306 includes polyurethane material.

[0058] In actual applications, the shock-absorbing film 306 is arranged on the inner wall of the fixing groove 305 and fits with the outer wall of the fixing block 405. By adding the shock-absorbing film 306 made of polyurethane material between the fixing groove 305 and the fixing block 405, the noise generated at the connection when the fan blades are running can be soundproofed. At the same time, the high shock-absorbing property of the polyurethane material can also effectively reduce the noise generated by the vibration of the fan blades.

[0059] In some embodiments of the present invention, the device also includes a noise reduction membrane 7, which covers the side of the first blade assembly 5 away from the sawtooth structure 502, and / or the noise reduction membrane 7 covers the side of the second blade assembly 6 away from the spoiler 602.

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

[0061] In some embodiments of the present invention, the material of the sawtooth structure 502 includes glass fiber material, and the material of the noise reduction membrane 7 includes polyurethane material.

[0062] Some embodiments of the present invention further provide a wind power generation equipment, wherein the wind power generation equipment comprises the blade noise reduction device of the wind power generation equipment as described above.

[0063] The embodiment of the present invention has the following advantages: the blade noise reduction device of the wind power generation equipment provided by the embodiment of the present invention includes: a fan shaft 1 and a main base 2, the main base 2 is coaxially connected to 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 to the main base 2 through a connecting part, and the other end is connected to the second blade assembly 6; the connecting part is provided with a silencer 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 sawtooth structures 502, and a combing flow main rod 503 is provided between adjacent sawtooth structures 502, and combing flow oblique rods 504 are provided on both sides of the combing flow 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 sawtooth structure 502. When the blades of the wind power generation equipment rotate, the noise transmitted by the motor of the wind power generation equipment can be effectively reduced by the silencer ring 302 arranged at the connection part. The airflow passes through the sawtooth structure 502 of the front blade 501 to form a tail vortex. The tail vortices generated by the comb flow assembly composed of the comb flow main rod 503 and the comb flow oblique rod 504 interact with each other to offset each other and realize the noise reduction of the front blade 501. At the same time, when the air passes through the tail blade 601, it is offset by the spoiler 602 to realize the noise reduction of the tail blade 601, thereby reducing the noise generated by the rotation of the fan blade as a whole, effectively improving the use effect of the blade.

[0064] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0065] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0066] Finally, 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 terminal 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 terminal device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the above elements.

[0067] The above is a detailed introduction to a blade noise reduction device for a wind power generation equipment provided. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for general technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A blade noise reduction device for a wind power generation equipment, characterized in that: The device comprises: A fan shaft (1) and a main base (2), wherein the main base (2) is coaxially connected to the fan shaft (1); A first blade assembly (5) and a second blade assembly (6), wherein one end of the first blade assembly (5) is connected to the main base (2) through a connecting portion, and the other end is connected to the second blade assembly (6); the connecting portion comprises a mounting assembly (3) and a docking assembly (4), wherein 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), and the other end of the docking assembly (4) is connected to the first blade assembly (5); the mounting assembly (3) comprises a mounting base (301) and a first flange (303), wherein one end of the mounting base (301) is fixedly mounted on the main base (2), and the other end is welded to the first flange (303); a silencer ring (302) is nested on the outer surface of the mounting base (301), and the first flange (303) is embedded with a fixing groove (305) and provided with a first mounting hole (304); the docking assembly (4) comprises a mounting base (301) and a first flange (303); The invention comprises a second flange (401) and a second mounting hole (402), wherein the second mounting hole (402) matches the first mounting hole (304), and a fixing block (405) is provided at one end of the second flange (401) close to the mounting assembly (3), and the fixing block (405) is used to be embedded in the fixing groove (305) so that the first flange (303) and the second flange (401) are fitted and fixed; the first blade assembly (5) comprises a front blade (501), a plurality of sawtooth structures (502) are provided on one side of the front blade (501), and a combing main rod (503) is provided between adjacent sawtooth structures (502), and combing oblique rods (504) are provided on both sides of the combing main rod (503); the second blade assembly (6) comprises a tail blade (601), and a spoiler (602) is provided on the same side of the tail blade (601) as the sawtooth structure (502).

2. The device according to claim 1, characterized in that A plurality of spoiler grooves (603) are provided on the upper surface and the lower surface of the spoiler plate (602), and one end of the spoiler groove (603) away from the tail blade (601) is connected to the guide groove (604).

3. The device according to claim 1 or 2, characterized in that: The device further comprises a noise reduction membrane (7), wherein the noise reduction membrane (7) covers a side of the first blade assembly (5) away from the sawtooth structure (502), and / or the noise reduction membrane (7) covers a side of the second blade assembly (6) away from the spoiler (602).

4. The device according to claim 1, characterized in that 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 angles between adjacent rectangular grooves are equal, and the first mounting holes (304) are respectively arranged at both ends of each rectangular groove, and the rectangular grooves match the fixing block (405) with each other.

5. The device according to claim 1, characterized in that The silencer ring (302) is a straight tube structure, and a plurality of silencer holes are arranged on the silencer ring (302).

6. The device according to claim 1, characterized in that The connecting portion further comprises a bolt (403) and a nut (404), wherein the bolt (403) is used to penetrate the first mounting hole (304) and the second mounting hole (402) and be fixed by the nut (404) so ​​that the first flange (303) and the second flange (401) are installed and fit together.

7. The device according to claim 1, characterized in that The inner wall of the fixing groove (305) is covered with a shock-absorbing film (306), and the material of the shock-absorbing film (306) includes polyurethane material.

8. The device according to claim 3, characterized in that The material of the sawtooth structure (502) includes glass fiber material, and the material of the noise reduction membrane (7) includes polyurethane material.

9. The device according to claim 2, characterized in that The material of the inner wall of the spoiler groove (603) includes a sound insulation and damping material, and / or the material of the inner wall of the guide groove (604) includes a sound insulation and damping material.

10. A wind power generation device, 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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