Wind driven generator with noise reduction structure

Abstract

The invention discloses a wind driven generator with a noise reduction structure, and relates to the technical field of wind driven generators, the wind driven generator comprises a flow guide cover, multiple sets of blades are connected to the outer side of the flow guide cover, a sawtooth mechanism is arranged at one end of each blade, a protective shell is arranged at one end of the flow guide cover, and a generator is arranged in the protective shell; a gearbox is arranged in the protective shell, a hydraulic damping rod is arranged in the supporting rod, and a flow guide mechanism is arranged in the supporting rod. Blades rotate under the action of wind power, a tail end sawtooth mechanism adjusts the distance through a balancing weight and a spring, the distance is increased to disperse eddy currents and reduce noise in strong wind, the distance is reduced to refine the eddy currents and inhibit low-frequency noise in small wind, and vibration of a gearbox is amplified through a connecting rod and transmitted to a hydraulic damping rod; when the wind speed is high, the expansion angle of the flow guide plate is increased to break large-scale vortexes, when the wind speed is low, retraction is reduced to reduce resistance, the angle of the flow guide plate is further increased, and the structure adapts to wind speed changes and is good in noise reduction effect and high in reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbines, and specifically to a wind turbine with a noise reduction structure. Background Art

[0002] A wind turbine is a device that converts wind energy into electrical energy. Its technology has evolved over a long period. In the early days, windmills were mainly used for mechanical power, such as grinding flour and pumping water. At the end of the 19th century, the first wind turbine for power generation was born, but its efficiency was low. In the 1970s, the oil crisis promoted the development of modern wind power technology. The blade materials were upgraded from wood and metal to lightweight and high-strength fiberglass and carbon fiber, improving the wind energy capture efficiency. The generator technology was improved from fixed pitch to variable pitch and variable speed constant frequency systems, enhancing the grid compatibility. Offshore wind power emerged, with the single unit power breaking through 20 MW, adopting intelligent control and large diameter wind turbines, significantly increasing the power generation. Modern wind turbines consist of a wind wheel, a transmission system, a generator, yaw, and a tower, etc., and achieve stable grid connection by combining power electronics technology, becoming an important pillar of renewable energy.

[0003] In the prior art, the sawtooth structure or small wing of traditional wind turbines adopts a fixed tooth pitch design, which is difficult to adapt to the noise spectrum shift caused by changes in wind speed, resulting in poor noise reduction effect in the high-frequency band. At the same time, the passive noise reduction mechanism of its deflector relies on a fixed air flow direction and lacks dynamic adjustment ability, and its performance is limited under complex wind conditions. In addition, the vibration isolation structure between the gearbox and the main shaft is prone to stress concentration due to component deformation, and long-term operation may cause fatigue damage to the bolt connection parts, affecting the structural reliability. These design defects jointly restrict the noise control efficiency and long-term operation stability of the whole machine. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide a wind turbine with a noise reduction structure to solve the technical problems that the tooth pitch of the traditional sawtooth structure or small wing of the wind turbine is fixed and cannot adapt to the noise spectrum change under different wind speeds, resulting in limited high-frequency noise suppression effect, and the passive noise reduction of the deflector depends on the air flow direction and lacks dynamic adjustment ability, and then the vibration isolation structure between the gearbox and the main shaft is prone to stress concentration due to component deformation, affecting the bolt connection life.

[0005] To achieve the above object, the present invention provides the following technical solution: A wind turbine with a noise reduction structure, including a fairing, a plurality of groups of blades are connected to the outside of the fairing, a sawtooth mechanism is provided at one end of the blade, a protective shell is provided at one end of the fairing, a generator is provided inside the protective shell, a gearbox is provided inside the protective shell, and the generator is matched with the gearbox. Two connecting rods are provided at the bottom end of the gearbox, a fixing block is provided at the bottom end of the connecting rod, a support rod is provided at the bottom end of the protective shell, a hydraulic damping rod is provided inside the support rod, and the input end of the hydraulic damping rod is fixed to the fixing block. A flow guiding mechanism is provided inside the support rod.

[0006] By adopting the above technical solution, when the blade rotates, the sawtooth mechanism provided at one end thereof will reduce noise at the tail end. When the external wind force is large, the counterweight provided inside the sawtooth mechanism will slide outward along the inside of the fixed box due to the centrifugal force, and at the same time, it will drive the spring to stretch outward, so that the sawteeth fixed outside the spring will show a larger spacing, so as to achieve a high air flow speed and a large eddy current intensity. It is necessary to increase the sawtooth spacing to disperse large-scale eddies and reduce the pressure pulsation noise at the trailing edge of the blade.

[0007] Further, the sawtooth mechanism includes sawteeth, a spring, a counterweight and a fixed box. The sawteeth are arranged inside the fixed box, the spring is arranged inside the fixed box, the counterweight is arranged at one end of the spring, the fixed box is fixed at one end of the blade, a cavity matching the sawteeth is opened inside the fixed box, and a clamping block matching the fixed box is fixed at the bottom end of the counterweight.

[0008] By adopting the above technical solution, when the wind force is small, the contraction force of the spring is greater than the centrifugal weight of the counterweight, so the spacing between multiple sawteeth will be reduced, so as to achieve relatively stable air flow. Narrowing the sawtooth spacing can refine the eddy current breaking range and improve the low-frequency noise suppression effect.

[0009] Further, the flow guiding mechanism includes a guiding plate, a chute, a fixed ring and a flow guiding plate. The guiding plate is arranged inside the fixed ring, the chute is opened inside the guiding plate, the fixed ring is arranged inside the support rod, the flow guiding plate is arranged at the bottom end of the fixed ring, the fixed ring and the flow guiding plate are rotatably connected by a rotating rod, and a limiting block is slidably connected inside the guiding plate.

[0010] By adopting the above technical solution, when the blade converts wind power into rotational force, the rotational force will be transmitted to the gearbox through the coupling located inside the protective shell, and the rotation will be transmitted to the generator through the gearbox. At this time, the gearbox will generate a certain degree of vibration during operation. At this time, the two sets of connecting rods arranged at its bottom end will amplify the vibration of the gearbox through the lever effect, and then transmit it to the two sets of hydraulic damping rods located inside the support rod, so that the hydraulic damping rods can squeeze the hydraulic oil, and the hydraulic oil will be transmitted to the hydraulic push rod through the hydraulic pipe, so that the output end of the hydraulic push rod can be advanced forward.

[0011] Further, a hydraulic push rod is arranged at the bottom end of the hydraulic damping rod. The hydraulic push rod is communicated with the hydraulic damping rod through a hydraulic pipe. The hydraulic push rod and the limit block are fixed by bolts. A cavity matching with the connecting rod is arranged inside the fixed block.

[0012] By adopting the above technical solution, the limit block at the output end is driven to displace downward. And because the position of the hydraulic push rod is fixed, it will be forced to squeeze the guide plate. And due to the chute inside the guide plate, the fixed ring fixed to the guide plate will rotate by a certain degree. When the fixed ring rotates, it will drive a plurality of guide plates to rotate by a certain degree, so as to increase the angle, achieving the effective dispersion of the airflow impact from any direction, reducing the vortex shedding noise. And when the wind speed is high, the oil pressure rises, the unfolding angle of the guide plate increases, breaking the large-scale eddies. When the wind speed is low, it retracts, reducing the aerodynamic drag.

[0013] In summary, the present invention mainly has the following beneficial effects: In the present invention, the blade rotates under the action of wind power. The tail-end sawtooth mechanism adjusts the distance through the counterweight block and the spring. When the wind is strong, the distance is increased to disperse the eddies and reduce the noise. When the wind is weak, the distance is reduced to refine the eddies and suppress the low-frequency noise. The rotational force is transmitted to the gearbox through the coupling. The vibration of the gearbox is amplified by the connecting rod and transmitted to the hydraulic damping rod. The hydraulic oil pushes the hydraulic push rod. The limit block displaces and squeezes the guide plate, driving the fixed ring to rotate, adjusting the angle of the guide plate, dispersing the airflow impact and reducing the vortex noise. When the wind speed is high, the unfolding angle of the guide plate increases to break the large-scale eddies. When the wind speed is low, it retracts to reduce the resistance. When the external wind force is too large, the vibration of the gearbox intensifies, and the angle of the guide plate further increases. This structure adapts to the change of wind speed, has a good noise reduction effect and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the internal structural schematic diagram of the present invention; Figure 3 is of the present invention Figure 2 enlarged view of part A; Figure 4Schematic diagram of the local structure of the present invention; Figure 5 For the present invention Figure 4 Enlarged view of part B of the present invention.

[0015] Figure 6 Schematic diagram of the partial structure of the present invention; Figure 7 For the present invention Figure 6 Enlarged view of part C of the present invention; Figure 8 Schematic diagram of the diversion mechanism structure of the present invention; Figure 9 For the present invention Figure 8 Enlarged view of part D of the present invention.

[0016] In the figure: 1, blade; 2, protective shell; 3, fairing; 4, serration mechanism; 401, serration; 402, spring; 403, counterweight; 404, fixed box; 5, diversion mechanism; 501, guide plate; 502, chute; 503, fixing ring; 504, diversion plate; 6, support rod; 7, hydraulic push rod; 8, limit block; 9, generator; 10, gearbox; 11, hydraulic damping rod; 12, connecting rod; 13, fixed block; 14, hydraulic pipe. Detailed implementation manners

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0018] Next, the embodiments of the present invention will be described according to the overall structure of the present invention.

[0019] A wind turbine with a noise reduction structure, as Figures 1-9As shown in the figure, it includes a fairing 3. Multiple groups of blades 1 are connected to the outside of the fairing 3. A sawtooth mechanism 4 is provided at one end of the blade 1. A protective shell 2 is provided at one end of the fairing 3. A generator 9 is provided inside the protective shell 2. A gearbox 10 is provided inside the protective shell 2, and the generator 9 is matched with the gearbox 10. Two groups of connecting rods 12 are provided at the bottom end of the gearbox 10. A fixed block 13 is provided at the bottom end of the connecting rod 12. A support rod 6 is provided at the bottom end of the protective shell 2. A hydraulic damping rod 11 is provided inside the support rod 6, and the input end of the hydraulic damping rod 11 is fixed to the fixed block 13. A flow guiding mechanism 5 is provided inside the support rod 6. When the blade 1 rotates, the sawtooth mechanism 4 provided at one end thereof will reduce noise at the tail end. When the external wind force is large, the counterweight 403 provided inside the sawtooth mechanism 4 will slide outward along the inside of the fixed box 404 due to the centrifugal force. At the same time of sliding, it will also drive the spring 402 to stretch outward, so that the sawteeth 401 fixed on the outside of the spring 402 will present a larger spacing, so as to achieve a high air flow velocity and a large eddy current intensity. It is necessary to increase the spacing of the sawteeth 401 to disperse large-scale eddies and reduce the pressure pulsation noise at the trailing edge of the blade 1. Exemplarily, the sawtooth mechanism 4 includes sawteeth 401, a spring 402, a counterweight 403, and a fixed box 404. The sawteeth 401 are arranged inside the fixed box 404. The spring 402 is arranged inside the fixed box �. The counterweight 403 is arranged at one end of the spring 402. The fixed box 404 is fixed to one end of the blade 1. A cavity matched with the sawteeth 401 is opened inside the fixed box 404. A clamping block matched with the fixed box 404 is fixed to the bottom end of the counterweight 403. When the wind force is small, the contraction force of the spring 402 is greater than the centrifugal weight of the counterweight 403, so the spacing between multiple groups of sawteeth 401 will be reduced, so as to achieve relatively stable air flow. Reducing the spacing of the sawteeth 401 can refine the eddy current breaking range and improve the low-frequency noise suppression effect. Exemplarily, the fixed ring 503 and the flow guiding plate 504 are rotationally connected through a rotating rod. A limiting block 8 is slidably connected inside the guiding plate 501. A hydraulic push rod 7 is provided at the bottom end of the hydraulic damping rod 11. The hydraulic push rod 7 and the hydraulic damping rod 11 are communicated through a hydraulic pipe 14. When the blade 1 converts the wind force into a rotational force, the rotational force will be transmitted to the gearbox 10 through a coupling located inside the protective shell 2, and the rotation will be transmitted to the generator 9 through the gearbox 10. At this time, the gearbox 10 will generate a certain amplitude of vibration during operation. At this time, the two groups of connecting rods 12 provided at its bottom end will amplify the vibration of the gearbox 10 through the lever effect, and then transmit it to the two groups of hydraulic damping rods 11 located inside the support rod 6, so that the hydraulic damping rod 11 can squeeze the hydraulic oil and transmit the hydraulic oil to the hydraulic push rod 7 through the hydraulic pipe 14, so that the output end of the hydraulic push rod 7 advances forward. Exemplarily, the flow guiding mechanism 5 includes a guiding plate 501, a sliding groove 502, a fixing ring 503 and a flow guiding plate 504. The guiding plate 501 is arranged inside the fixing ring 503. The sliding groove 502 is formed inside the guiding plate 501. The fixing ring 503 is arranged inside the support rod 6. The flow guiding plate 504 is arranged at the bottom end of the fixing ring 503. The fixing ring 503 and the flow guiding plate 504 are rotationally connected through a rotating rod. A limiting block 8 is slidably connected inside the guiding plate 501. Among them, the limiting block 8 at the output end of the drive is displaced downward. And because the position of the hydraulic push rod 7 is fixed, it will be forced to squeeze the guiding plate 501. And because of the sliding groove 502 inside the guiding plate 501, the fixing ring 503 fixed to the guiding plate 501 will rotate by a certain amplitude. When the fixing ring 503 rotates, it will drive a plurality of flow guiding plates 504 to rotate by a certain amplitude, thereby increasing the angle, achieving the effective dispersion of the airflow impact from any direction, reducing the vortex shedding noise, and when the wind speed is high, the oil pressure increases, and the expansion angle of the flow guiding plate 504 increases to break large-scale vortices; when the wind speed is low, it retracts to reduce the aerodynamic drag. The working principle of the present invention is as follows: When in use, the overall wind turbine 1 is installed in a suitable position by the staff and then started. When the wind turbine 1 is forced to rotate, a plurality of blades 1 fixed by the flow guiding covers 3 provided at one end thereof will also rotate as the wind force increases. When the blade 1 rotates, the serration mechanism 4 provided at one end thereof will play a role in reducing noise at the tail end. When the external wind force is large, the counterweight 403 provided inside the serration mechanism 4 will slide outward along the inside of the fixed box 404 under the action of centrifugal force. At the same time of sliding, it will also drive the spring 402 to stretch outward, so that the serrations 401 fixed to the outside of the spring 402 will have a larger spacing, so as to achieve the effect of high air flow velocity and large vortex intensity, and it is necessary to increase the spacing of the serrations 401 to disperse large-scale vortices and reduce the pressure pulsation noise at the trailing edge of the blade 1. When the wind force is small, because the contraction force of the spring 402 is greater than the centrifugal weight of the counterweight 403, the spacing between the multiple serrations 401 will be reduced, so as to achieve relatively stable air flow. Narrowing the spacing of the serrations 401 can refine the vortex breaking range and improve the low-frequency noise suppression effect. When the blade 1 converts wind power into rotational force, the rotational force will be transmitted to the gearbox 10 through the coupling located inside the protective housing 2, and the rotation will be transmitted to the generator 9 through the gearbox 10. At this time, the gearbox 10 will generate a certain degree of vibration during operation. At this time, the two sets of connecting rods 12 provided at its bottom end will amplify the vibration of the gearbox 10 through the lever effect, so as to transmit it to the two sets of hydraulic damping rods 11 located inside the support rod 6, so that the hydraulic damping rods 11 can squeeze the hydraulic oil, and transmit the hydraulic oil through the hydraulic pipe 14 to the hydraulic push rod 7, so that the output end of the hydraulic push rod 7 advances forward; Thereby driving the limit block 8 at the output end to displace downward, and because the position of the hydraulic push rod 7 is fixed, it will be forced to squeeze the guide plate 501. Due to the chute 502 inside the guide plate 501, the fixed ring 503 fixed to the guide plate 501 will rotate by a certain degree. When the fixed ring 503 rotates, it will drive a plurality of guide plates 504 to rotate by a certain degree, thereby increasing the angle, achieving effective dispersion of airflow impacts from any direction, reducing vortex shedding noise, and when the wind speed is high, the oil pressure increases, and the expansion angle of the guide plate 504 increases, breaking large-scale vortices; when the wind speed is low, it retracts, reducing aerodynamic drag; And when the external wind force is too large, the gearbox 10 will also be forced to vibrate with a larger amplitude, thereby driving the guide plate 504 to rotate at a larger angle; Through the above structure, it achieves the functions of being able to adapt to the noise spectrum shift caused by wind speed changes, having a better noise reduction effect, and high structural reliability at the same time.

[0020] Although the embodiments of the present invention have been shown and described, the specific embodiments are only explanations of the present invention and not limitations thereof. The specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art can make modifications, substitutions and variations that do not make creative contributions to the embodiments according to needs, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A wind turbine with a noise reduction structure, including a fairing (3), characterized in that: A plurality of groups of blades (1) are connected to the outside of the fairing (3). A sawtooth mechanism (4) is provided at one end of the blade (1). A protective shell (2) is provided at one end of the fairing (3). A generator (9) is provided inside the protective shell (2). A gearbox (10) is provided inside the protective shell (2), and the generator (9) is matched with the gearbox (10). Two connecting rods (12) are provided at the bottom end of the gearbox (10). A fixing block (13) is provided at the bottom end of the connecting rod (12). A support rod (6) is provided at the bottom end of the protective shell (2). A hydraulic damping rod (11) is provided inside the support rod (6), and the input end of the hydraulic damping rod (11) is fixed to the fixing block (13). A flow guiding mechanism (5) is provided inside the support rod (6).

2. The wind turbine with a noise reduction structure according to claim 1, characterized in that: The sawtooth mechanism (4) includes sawteeth (401), a spring (402), a counterweight (403) and a fixing box (404). The sawteeth (401) are arranged inside the fixing box (404). The spring (402) is arranged inside the fixing box (404). The counterweight (403) is arranged at one end of the spring (402). The fixing box (404) is fixed to one end of the blade (1).

3. The wind turbine with a noise reduction structure according to claim 2, wherein: A cavity matching the sawteeth (401) is formed inside the fixing box (404). A clamping block matching the fixing box (404) is fixed to the bottom end of the counterweight (403).

4. A wind turbine with a noise reduction structure according to claim 1, characterized in that: The flow guiding mechanism (5) includes a guiding plate (501), a sliding groove (502), a fixing ring (503) and a flow guiding plate (504). The guiding plate (501) is arranged inside the fixing ring (503). The sliding groove (502) is formed inside the guiding plate (501). The fixing ring (503) is arranged inside the support rod (6). The flow guiding plate (504) is arranged at the bottom end of the fixing ring (503).

5. The wind turbine with a noise reduction structure according to claim 4, characterized in that: The fixing ring (503) and the flow guiding plate (504) are rotationally connected by a rotating rod. A limiting block (8) is slidably connected inside the guiding plate (501).

6. The wind turbine with a noise reduction structure according to claim 1, wherein: A hydraulic push rod (7) is provided at the bottom end of the hydraulic damping rod (11). The hydraulic push rod (7) is communicated with the hydraulic damping rod (11) through a hydraulic pipe (14).

7. A wind turbine with a noise reduction structure according to claim 6, characterized in that: The hydraulic push rod (7) and the limiting block (8) are fixed by bolts. A cavity matching the connecting rod (12) is formed inside the fixing block (13).

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