Noise reduction device for wind turbine

Abstract

The present invention provides a noise reduction device for a wind turbine generator, which relates to the technical field of wind turbine generators and comprises a silencer mechanism, wherein the silencer mechanism is arranged on a support column, a generator is arranged in the silencer mechanism, and a sealing mechanism is arranged at one end of the silencer mechanism, and the wind turbine generator is fixed on the ground by the support column for use, the support column supports and fixes the silencer mechanism, the silencer mechanism fixes the generator, the silencer mechanism silences the noise generated by the generator during operation, reduces the noise generated by the generator from being transmitted to the outside, and simultaneously damps the vibration generated by the generator during operation, reduces the noise generated by the vibration, and further reduces the occurrence of noise, and the sealing mechanism seals the silencer mechanism, so that the sound sealing performance of the silencer mechanism is better, the noise generated in the silencer mechanism is more difficult to be transmitted, the harm to human health is reduced, and the noise pollution caused to the surrounding environment is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine generators, and in particular to a noise reduction device for wind turbine generators. Background Art

[0002] A wind turbine is an electrical device that converts wind energy into mechanical work, which drives the rotor to rotate and ultimately outputs alternating current.

[0003] As an important device for renewable energy, wind turbines have a relatively simple working principle. The wind rotor rotates under the action of wind, converting the kinetic energy of the wind into the mechanical energy of the wind rotor shaft. The generator rotates and generates electricity driven by the wind rotor shaft. However, wind turbines are prone to noise problems during operation. The noise from the generator set not only harms human health and work and life, but may also pollute the surrounding environment.

[0004] Therefore, it is particularly important to develop a noise reduction device for a wind turbine. Summary of the invention

[0005] The present invention provides a noise reduction device for a wind turbine generator, so as to solve the defects in the prior art.

[0006] The present invention provides a noise reduction device for a wind turbine generator, comprising a muffler mechanism, wherein the muffler mechanism is arranged on a support column, a generator is arranged inside the muffler mechanism, and a sealing mechanism is arranged at one end of the muffler mechanism.

[0007] Preferably, the silencer mechanism includes a silencer shell, the silencer shell is arranged on the support column, the generator is arranged in the silencer shell, a through hole is opened on the side wall of the silencer shell, the driving end of the generator passes through the through hole and extends out of the silencer shell, a bearing 1 is arranged between the through hole and the driving end of the generator, the driving end of the generator is connected to a rotating shaft through a coupling, a connecting component is fixedly arranged on the rotating shaft, the connecting component is fixedly connected to a round block, and a plurality of fan blades are arranged on the round block.

[0008] Preferably, the connecting assembly includes a connecting sleeve, which is sleeved on the rotating shaft, one end of the connecting sleeve is fixedly connected to the round block, a shock-absorbing spring is arranged in the connecting sleeve, two key grooves 1 are symmetrically arranged with the rotating shaft as the axis center in the end of the rotating shaft away from the driving end of the generator, two key grooves 2 are arranged on the inner wall of the connecting sleeve corresponding to the key groove 1, and sliding keys are inserted in the key groove 1 and the key groove 2.

[0009] Preferably, a plurality of first buffer grooves are respectively provided on the top and bottom of the silencer shell, a first buffer block is arranged in the first buffer groove, a first buffer spring is arranged between one side of the first buffer block and the inner wall of the first buffer groove, a first buffer column is arranged on the other side of the first buffer block, a reinforcing column is fixedly arranged on the first buffer column, a second buffer spring is sleeved on the first buffer column, a plurality of reinforcing columns are respectively provided on the top and bottom of the generator, a plurality of second buffer grooves are respectively provided on the side wall of the silencer shell, a second buffer block is arranged in the second buffer groove, a third buffer spring is arranged between one side of the second buffer block and the inner wall of the second buffer groove, a second buffer column is arranged on the other side of the second buffer block, and a plurality of second buffer columns are arranged on the side of the generator.

[0010] Preferably, sound-absorbing cotton is arranged on the inner wall of the sound-absorbing shell.

[0011] Preferably, the sealing mechanism includes a fixed tube, which is fixed on the silencer shell outside the through hole, and the fixed tube is coaxially arranged with the through hole. A bearing 2 is fixedly sleeved on the outer wall of the other end of the fixed tube away from the through hole, and a ferrule is arranged outside the fixed tube. The ferrule is fixedly connected to the round block at one end away from the fixed tube, and an avoidance groove is opened on the inner wall of the ferrule. The inner wall of the avoidance groove is in contact with the rotating end of the outer ring of the second bearing, and a fourth buffer spring is sleeved on the fixed tube between the ferrule and the outer wall of the silencer shell.

[0012] Preferably, it also includes:

[0013] Wind speed detection module, used to measure the wind speed of the environment where the fan blades are located;

[0014] An angular velocity detection module is used to measure the rotational angular velocity of the circular block;

[0015] A wind direction angle detection module is used to measure the wind direction angle of the environment in which the fan blades are located;

[0016] Calculation module 1, used to calculate the actual wind force that the circular block bears based on the wind speed in the environment where the fan blade is located;

[0017] An alarm module, used for issuing an alarm;

[0018] A processing module, used for comparing the actual wind force that the circular block can withstand obtained by the calculation module 1 with the theoretical maximum allowable wind force that the circular block can withstand;

[0019] The control module controls the alarm module to sound an alarm when the actual wind force that the circular block bears is greater than or equal to the theoretical maximum allowable wind force that the circular block bears, and controls the wind turbine generator to stop working at the same time; when the actual wind force that the circular block bears is less than the theoretical maximum allowable wind force that the circular block bears, the wind turbine generator works normally.

[0020] Preferably, the calculation module 1 calculates based on the following formula 1:

[0021]

[0022] F is the actual wind force that the circular block is subjected to, ρ is the air density, L is the number of fan blades, S1 is the normal force coefficient of the fan blade subjected to wind force (the value range is 0-1), S2 is the tangential force coefficient of the fan blade subjected to wind force (the value range is 0-1), v is the wind speed detected by the wind speed detection module, ω is the rotation angular velocity of the circular block detected by the angular velocity detection module, r is the length of the fan blade, π is the pi, θ is the wind direction angle, and c is the thickness of the fan blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the overall structure provided by an embodiment of the present invention;

[0025] Figure 2 It is a schematic diagram of the overall cross-sectional structure provided by an embodiment of the present invention.

[0026] Reference numerals:

[0027] 1. Support column; 2. Silencing mechanism; 21. Silencing shell; 211. Perforation; 212. Bearing 1; 213. First buffer groove; 2131. First buffer block; 2132. First buffer spring; 2133. First buffer column; 2134. Reinforcement column; 2135. Second buffer spring; 214. Second buffer groove; 2141. Second buffer block; 2142. Third buffer spring; 2143. Second buffer column; 215. Silencing cotton; 22. Generator; 23. Rotating shaft; 231. Keyway 1; 24. Connecting assembly; 241. Connecting sleeve; 242. Sliding key; 243. Round block; 244. Shock-absorbing spring; 245. Keyway 2; 25. Fan blade; 3. Sealing mechanism; 31. Fixed tube; 32. Bearing 2; 33. Cardan; 34. Avoidance groove; 35. Fourth buffer spring. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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.

[0029] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] The present invention provides the following embodiments

[0031] Example 1

[0032] The embodiment of the present invention provides a noise reduction device for a wind turbine generator, such as Figure 1-Figure 2 As shown, it comprises: a silencer mechanism 2, wherein the silencer mechanism 2 is arranged on a support column 1, a generator 22 is arranged inside the silencer mechanism 2, and a sealing mechanism 3 is arranged at one end of the silencer mechanism 2.

[0033] The working principle and beneficial effects of the above technical solution are as follows: the wind turbine 22 is fixed on the ground by the support column 1, the support column 1 supports and fixes the silencer mechanism 2, the silencer mechanism 2 fixes the generator 22, the silencer mechanism 2 silences the noise generated by the generator 22 during operation, reduces the noise generated by the generator 22 from being transmitted to the outside, and at the same time, damps the vibration generated by the generator 22 during operation, reduces the noise generated by the vibration, and further reduces the occurrence of noise, the sealing mechanism 3 seals the silencer mechanism 2, makes the sound sealing of the silencer mechanism 2 better, and the noise generated in the silencer mechanism 2 is more difficult to be transmitted, thereby reducing the harm to human health and reducing the noise pollution caused to the surrounding environment.

[0034] Example 2

[0035] On the basis of Example 1, Figure 1-Figure 2As shown, the silencer mechanism 2 includes a silencer shell 21, the silencer shell 21 is arranged on the support column 1, the generator 22 is arranged in the silencer shell 21, a through hole 211 is opened on the side wall of the silencer shell 21, the driving end of the generator 22 passes through the through hole 211 and extends out of the silencer shell 21, a bearing 212 is arranged between the through hole 211 and the driving end of the generator 22, the driving end of the generator 22 is connected to the rotating shaft 23 through a coupling transmission, a connecting component 24 is fixedly arranged on the rotating shaft 23, the connecting component 24 is fixedly connected to the round block 243, and a plurality of fan blades 25 are arranged on the round block 243.

[0036] The working principle and beneficial effects of the above technical solution are as follows: the support column 1 supports and fixes the silencer shell 21, the silencer shell 21 fixes the generator 22, the through hole 211 avoids the driving end of the generator 22, the through hole 211 fixes the bearing 212, the bearing 212 assists in rotation limiting the driving end of the generator 22, the driving end of the generator 22 drives the rotating shaft 23 to rotate through the coupling, the rotating shaft 23 is fixedly connected to the round block 243 through the connecting component 24, the round block 243 fixes the fan blades 25, the external wind blows the fan blades 25 and the round block 243 to rotate, and drives the driving end of the generator 22 to rotate through the connecting component 24, thereby driving the generator 22 to generate electricity.

[0037] Example 3

[0038] On the basis of Example 2, Figure 1-Figure 2 As shown, the connecting component 24 includes a connecting sleeve 241, and the connecting sleeve 241 is sleeved on the rotating shaft 23. One end of the connecting sleeve 241 is fixedly connected to the round block 243. A shock-absorbing spring 244 is arranged in the connecting sleeve 241. Two key grooves 231 are symmetrically arranged with the rotating shaft 23 as the axis in one end of the rotating shaft 23 away from the driving end of the generator 22. Two key grooves 245 are arranged on the inner wall of the connecting sleeve 241 corresponding to the key grooves 1 231. Sliding keys 242 are inserted in the key grooves 1 231 and the key grooves 2 245.

[0039] The working principle and beneficial effects of the above technical solution are as follows: the outer surface of the rotating shaft 23 limits the connecting sleeve 241, keyway 1 231 and keyway 245 limit the sliding key 242, the rotating shaft 23 and the connecting sleeve 241 are connected by the sliding key 242, the connecting sleeve 241 moves along the axial direction of the rotating shaft 23 and can rotate synchronously with the rotating shaft 23, the connecting sleeve 241 rotates synchronously with the round block 243, the shock-absorbing spring 244 elastically damps the round block 243 and the rotating shaft 23, the round block 243 drives the connecting sleeve 241 and the rotating shaft 23 to rotate when rotating, and can also move along the axial direction of the rotating shaft 23 under the thrust of the wind, thereby reducing the stiffness impact between the round block 243 and the connecting sleeve 241 and the rotating shaft 23, and increasing the bearing capacity between the round block 243 and the connecting sleeve 241 and the rotating shaft 23.

[0040] Example 4

[0041] On the basis of Example 3, Figure 1-Figure 2 As shown, a plurality of first buffer grooves 213 are respectively provided at the top and the bottom of the muffler shell 21, a first buffer block 2131 is provided in the first buffer groove 213, a first buffer spring 2132 is provided between one side of the first buffer block 2131 and the inner wall of the first buffer groove 213, a first buffer column 2133 is provided on the other side of the first buffer block 2131, a reinforcing column 2134 is fixedly provided on the first buffer column 2133, and a second buffer spring 2135 is sleeved on the first buffer column 2133. A plurality of reinforcing columns 2134 are respectively provided on the top and bottom of the generator 22, a plurality of second buffer grooves 214 are opened on the side wall of the muffler shell 21, a second buffer block 2141 is provided in the second buffer groove 214, a third buffer spring 2142 is provided between one side of the second buffer block 2141 and the inner wall of the second buffer groove 214, a second buffer column 2143 is provided on the other side of the second buffer block 2141, and a plurality of second buffer columns 2143 are provided on the side of the generator 22;

[0042] The inner wall of the silencer shell 21 is provided with silencer cotton 215 .

[0043] The working principle and beneficial effects of the above technical solution are as follows: the first buffer groove 213 limits the first buffer block 2131, the first buffer block 2131 is fixedly connected to the generator 22 through the first buffer column 2133 and the reinforcing column 2134, the first buffer spring 2132 buffers the inner wall of the first buffer groove 213 and the first buffer block 2131, when the generator 22 is vibrated and moved, the generator 22 is vertically moved by the first buffer columns 2133 and the reinforcing column 2134 at the top and bottom, the first buffer spring 2132 buffers the first buffer block 2131, and the second buffer spring 2135 buffers the first buffer column 213 3 and the inner wall of the silencer shell 21, the vertical direction of the generator 22 is shock-absorbing and fixed, the second buffer groove 214 limits the second buffer block 2141, the second buffer block 2141 is fixedly connected to the generator 22 through the second buffer column 2143, the third buffer spring 2142 buffers the inner wall of the second buffer groove 214 and the second buffer block 2141, and the side of the generator is shock-absorbing and fixed to prevent the generator 22 from emitting collision noise when shaking, thereby reducing the noise generated by the generator 22, and the silencer cotton 215 absorbs a small part of the noise generated, thereby further eliminating the noise.

[0044] Example 5

[0045] On the basis of Example 4, Figure 1-Figure 2 As shown, the sealing mechanism 3 includes a fixed tube 31, the fixed tube 31 is fixed on the silencer shell 21 outside the through hole 211, the fixed tube 31 and the through hole 211 are coaxially arranged, and a bearing 2 32 is fixedly sleeved on the outer wall of the other end of the fixed tube 31 away from the through hole 211, and a clamping sleeve 33 is arranged on the outer sleeve of the fixed tube 31, and the end of the clamping sleeve 33 away from the fixed tube 31 is fixedly connected to the round block 243, and an avoidance groove 34 is opened on the inner wall of the clamping sleeve 33, and the inner wall of the avoidance groove 34 is in contact with the rotating end of the outer ring of the bearing 2 32, and a fourth buffer spring 35 is sleeved on the fixed tube 31 between the clamping sleeve 33 and the outer wall of the silencer shell 21.

[0046] The working principle and beneficial effects of the above technical solution are as follows: the muffler shell 21 fixes the fixed tube 31, and the fixed tube 31 is coaxially arranged with the perforation 211 to prevent the rotation of the driving shaft of the generator 22 from being affected. The fixed tube 31 fixes the fixed end of the inner ring of the second bearing 32, and the fixed tube 31 limits the ferrule 33. The fixed tube 31 is connected with the round block 243 through the ferrule 33. The avoidance groove 34 avoids the second bearing 32 when the ferrule 33 moves along the axial direction of the fixed tube 31. The ferrule 33 rotates synchronously with the rotating end of the outer ring of the second bearing 32. The fourth buffer spring 35 plays a buffering role between the ferrule 33 and the muffler shell 21. The round block 243 drives the ferrule 33 to rotate when rotating. The ferrule 33 rotates outside the second bearing 32 and the fixed tube 31, and the muffler shell 21 is rotated and sealed to prevent the noise generated by the rotating shaft 23 and the generator 22 during operation from leaking, thereby further reducing the noise of the wind turbine 22.

[0047] Example 6

[0048] On the basis of Example 5, the present invention further comprises:

[0049] A wind speed detection module, used to measure the wind speed of the environment in which the fan blade 25 is located;

[0050] An angular velocity detection module, used to measure the rotational angular velocity of the circular block 243;

[0051] A wind direction angle detection module is used to measure the wind direction angle of the environment in which the fan blade 25 is located;

[0052] Calculation module 1, used to calculate the actual wind force borne by the circular block 243 based on the wind speed of the environment where the fan blade 25 is located;

[0053] An alarm module, used for issuing an alarm;

[0054] A processing module, used for comparing the actual wind force that the circular block 243 can withstand obtained by the calculation module 1 with the theoretical maximum allowable wind force that the circular block 243 can withstand;

[0055] The control module controls the alarm module to sound an alarm when the actual wind force that the circular block 243 can withstand is greater than or equal to the theoretical maximum allowable wind force that the circular block 243 can withstand, and controls the wind turbine 22 to stop working at the same time; when the actual wind force that the circular block 243 can withstand is less than the theoretical maximum allowable wind force that the circular block 243 can withstand, the wind turbine 22 works normally.

[0056] The working principle and beneficial effects of the above technical solution are as follows: the wind speed detection module measures the wind speed of the environment in which the fan blades 25 are located, the angular velocity detection module measures the rotational angular velocity of the circular block 243, the wind direction angle detection module measures the wind direction angle of the environment in which the fan blades 25 are located, the calculation module 1 calculates the actual wind force that the circular block 243 can withstand based on the wind speed of the environment in which the fan blades 25 are located, the alarm module is used to issue an alarm, and the processing module compares the actual wind force that the circular block 243 can withstand obtained by the calculation module 1 with the theoretical maximum allowable wind force that the circular block 243 can withstand. When the actual wind force that the circular block 243 can withstand is greater than or equal to the theoretical maximum allowable wind force that the circular block 243 can withstand, the control module controls the alarm module to issue an alarm and at the same time controls the wind turbine 22 to stop working. When the actual wind force that the circular block 243 can withstand is less than the theoretical maximum allowable wind force that the circular block 243 can withstand, the wind turbine 22 works normally.

[0057] Example 7

[0058] Based on Example 6, the calculation module 1 calculates based on the following formula 1:

[0059]

[0060] F is the actual wind force borne by the circular block 243, ρ is the air density, L is the number of fan blades 25, S1 is the normal force coefficient of the fan blade 25 subjected to the wind force, and its value range is 0-1, S2 is the tangential force coefficient of the fan blade 25 subjected to the wind force, and its value range is 0-1, v is the wind speed detected by the wind speed detection module, ω is the rotational angular velocity of the circular block 243 detected by the angular velocity detection module, r is the length of the fan blade 25, π is the pi, θ is the wind direction angle, and c is the thickness of the fan blade 25.

[0061] The working principle and beneficial effects of the above technical solution are: The axial induction factor of the wind force on the circular block 243 is calculated by The tangential induction factor of the wind force on the circular block 243 is calculated by The actual wind force that the circular block 243 can withstand is calculated. When the actual wind force that the circular block 243 can withstand is greater than or equal to the theoretical maximum allowable wind force that the circular block 243 can withstand, the control module controls the alarm module to sound an alarm and controls the wind turbine 22 to stop working. When the actual wind force that the circular block 243 can withstand is less than the theoretical maximum allowable wind force that the circular block 243 can withstand, the wind turbine 22 works normally.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A noise reduction device for a wind turbine, characterized in that: include: A silencer mechanism (2) is provided on a support column (1), a generator (22) is provided inside the silencer mechanism (2), and a sealing mechanism (3) is provided at one end of the silencer mechanism (2).

2. A noise reduction device for a wind turbine according to claim 1, characterized in that: The silencer mechanism (2) comprises a silencer shell (21), the silencer shell (21) being arranged on the support column (1), the generator (22) being arranged in the silencer shell (21), a through hole (211) being provided on the side wall of the silencer shell (21), the driving end of the generator (22) passing through the through hole (211) and extending out of the silencer shell (21), a bearing 1 (212) being provided between the through hole (211) and the driving end of the generator (22), the driving end of the generator (22) being connected to a rotating shaft (23) through a coupling transmission, a connecting assembly (24) being fixedly provided on the rotating shaft (23), the connecting assembly (24) being fixedly connected to a round block (243), and a plurality of fan blades (25) being provided on the round block (243).

3. A noise reduction device for a wind turbine according to claim 2, characterized in that: The connecting assembly (24) comprises a connecting sleeve (241), wherein the connecting sleeve (241) is sleeved on the rotating shaft (23), one end of the connecting sleeve (241) is fixedly connected to the round block (243), a damping spring (244) is arranged in the connecting sleeve (241), two keyways (231) are symmetrically arranged with the rotating shaft (23) as the axis in the end of the rotating shaft (23) away from the driving end of the generator (22), two keyways (245) are arranged on the inner wall of the connecting sleeve (241) corresponding to the keyways (231), and sliding keys (242) are inserted in the keyways (231) and the keyways (245).

4. A noise reduction device for a wind turbine according to claim 3, characterized in that: The top and bottom of the muffler shell (21) are respectively provided with a plurality of first buffer grooves (213), a first buffer block (2131) is arranged in the first buffer groove (213), a first buffer spring (2132) is arranged between one side of the first buffer block (2131) and the inner wall of the first buffer groove (213), a first buffer column (2133) is arranged on the other side of the first buffer block (2131), a reinforcing column (2134) is fixedly arranged on the first buffer column (2133), a second buffer spring (2135) is sleeved on the first buffer column (2133), and the first buffer column (2133) is provided with a plurality of first buffer grooves (2131). A plurality of reinforcing columns (2134) are respectively arranged on the top and bottom of the generator (22); a plurality of second buffer grooves (214) are opened on the side wall of the silencer shell (21); a second buffer block (2141) is arranged in the second buffer groove (214); a third buffer spring (2142) is arranged between one side of the second buffer block (2141) and the inner wall of the second buffer groove (214); a second buffer column (2143) is arranged on the other side of the second buffer block (2141); and a plurality of second buffer columns (2143) are arranged on the side of the generator (22).

5. A noise reduction device for a wind turbine according to claim 2, characterized in that: The inner wall of the silencer shell (21) is provided with silencer cotton (215).

6. A noise reduction device for a wind turbine according to claim 3, characterized in that: The sealing mechanism (3) comprises a fixed tube (31), the fixed tube (31) being fixed on the silencer shell (21) outside the through hole (211), the fixed tube (31) being coaxially arranged with the through hole (211), a bearing 2 (32) being fixedly sleeved on the outer wall of the other end of the fixed tube (31) away from the through hole (211), a clamping sleeve (33) being disposed on the outer sleeve of the fixed tube (31), one end of the clamping sleeve (33) away from the fixed tube (31) being fixedly connected to the round block (243), an avoidance groove (34) being provided on the inner wall of the clamping sleeve (33), the inner wall of the avoidance groove (34) being in contact with the rotating end of the outer ring of the bearing 2 (32), and a fourth buffer spring (35) being sleeved on the fixed tube (31) between the clamping sleeve (33) and the outer wall of the silencer shell (21).

7. A noise reduction device for a wind turbine according to claim 2, characterized in that: Also includes: A wind speed detection module, used to measure the wind speed of the environment in which the fan blade (25) is located; An angular velocity detection module, used for measuring the rotational angular velocity of the circular block (243); A wind direction angle detection module, used to measure the wind direction angle of the environment in which the fan blade (25) is located; A calculation module 1, used for calculating the actual wind force borne by the circular block (243) based on the wind speed of the environment in which the fan blade (25) is located; An alarm module, used for issuing an alarm; A processing module, used for comparing the actual wind force that the circular block (243) can withstand obtained by the calculation module 1 with the theoretical maximum allowable wind force that the circular block (243) can withstand; The control module controls the alarm module to sound an alarm when the actual wind force that the circular block (243) can withstand is greater than or equal to the theoretical maximum allowable wind force that the circular block (243) can withstand, and controls the wind turbine generator (22) to stop working at the same time; when the actual wind force that the circular block (243) can withstand is less than the theoretical maximum allowable wind force that the circular block (243) can withstand, the wind turbine generator (22) can work normally.

8. A noise reduction device for a wind turbine according to claim 7, characterized in that: The calculation module 1 calculates based on the following formula 1: F is the actual wind force borne by the circular block (243), ρ is the air density, L is the number of the fan blades (25), S1 is the normal force coefficient of the fan blades (25) subjected to the wind force, S2 is the tangential force coefficient of the fan blades (25) subjected to the wind force, v is the wind speed detected by the wind speed detection module, ω is the rotational angular velocity of the circular block (243) detected by the angular velocity detection module, r is the length of the fan blade (25), π is the circumference, θ is the wind direction angle, and c is the thickness of the fan blade (25).

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