Noise reduction device of vertical axis wind turbine

Abstract

The invention relates to the technical field of wind power generation, in particular to a noise reduction device of a vertical axis wind turbine, which comprises a base and a wind turbine body, the wind turbine body is fixedly connected to the surface of the base, and the upper surface of the wind turbine body is fixedly connected with a mounting frame. According to the device, by arranging the telescopic adjusting device, when the device is used, firstly, wind power is collected through a wind collecting plate, meanwhile, a movable gear can be driven to rotate through a driving motor, so that a rotating rod operates, a driving bevel gear is driven to rotate, and a movable rod and a connecting plate are driven to move through a movable block; the wind collecting plate stretches and retracts to move front and back, then noise generated by the wind collecting plate is further absorbed through the sound absorbing cotton, the windward area can be adjusted according to the real-time wind speed through stretching and retracting of the length of the blades of the stretching and retracting adjusting device, the blades extend forwards when the wind speed is low, and the airflow energy capturing efficiency is improved by increasing the effective wind collecting area.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wind power generation technology, in particular to a vertical axis wind turbine noise reduction device. BACKGROUND

[0002] Vertical axis wind turbine generators are widely used because they do not require a yawing system and have a simple structure. Among them, the H-type vertical axis wind turbine is a typical lift-type vertical axis wind turbine. Due to the continuous change of the blade airfoil angle of attack during operation of this type of wind turbine, the overall efficiency of the wind wheel is not high, and it is difficult to self-start at low wind. To solve the problems of low wind energy utilization efficiency and difficulty in self-starting of H-type vertical axis wind turbines, there are technologies such as variable pitch, energy gathering and shielding, and wind gathering. The variable pitch technology adjusts the blade airfoil angle of attack mechanically or electronically to make it work in the appropriate range. This technology is complex and expensive, so most H-type vertical axis wind turbines are fixed blade lift-type.

[0003] Prior art such as CN111852755B includes a vertical axis wind turbine noise reduction device, belonging to the field of wind power generation. A vertical axis wind turbine noise reduction device is composed of an upper top seat, a lower base, a wind collecting plate and a multi-hole guide plate; the upper top seat and the lower base are welded with the wind collecting plate into a thin plate to form a whole structure; the wind collecting plate and the multi-hole guide plate are consistent in number and uniformly distributed in the circumferential direction; the upper top seat and the lower base are open hollow circular table structures, and the upper top seat and the lower base respectively include upper and lower circular cone plates and upper and lower circular ring plates; the limiting pin cooperates with the limiting hole on the lower circular ring plate to realize positioning and fixing. The present application changes the direction of natural incoming flow wind by the multi-hole guide plate, effectively reduces the flow field turbulence intensity by setting multiple circular holes, thereby improving the power of the vertical axis wind turbine and reducing the noise of the wind turbine flow field; the multi-hole guide plate is located at the wind discharge limiting position to realize wind discharge and improve the wind resistance and safety of the vertical axis wind turbine; the multi-hole guide plate is provided with multiple limiting positions, suitable for different types of vertical axis wind turbines under different working conditions, which is conducive to batch production and reduces the cost of a single unit.

[0004] Because the existing vertical axis wind turbine noise reduction device has limitations in the process of use, it is difficult to adjust the windward area according to the real-time wind speed, and it is difficult to adjust the extension length of the wind collecting blade according to the height of the wind speed, so as to reduce the wind collecting area and the capturing efficiency of the blade to the airflow, so it needs to be improved. SUMMARY

[0005] The purpose of the present invention is to solve the problem that some devices in the prior art have limitations during use, it is difficult to adjust the windward area according to the real-time wind speed, and it is difficult to adjust the extended length of the wind-collecting blades according to the wind speed, so that the wind-collecting area is reduced, thereby reducing the efficiency of the blades in capturing the airflow. A vertical axis wind turbine noise reduction device is proposed.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a vertical axis wind turbine noise reduction device, comprising a base and a wind turbine body, the wind turbine body being fixedly connected to the surface of the base, the upper surface of the wind turbine body being fixedly connected to a mounting frame, the top of the mounting frame being fixedly connected to a protective frame, a telescopic adjustment device being provided inside the mounting frame, the telescopic adjustment device comprising a rotating rod, the rotating rod being rotatably connected to the upper surface of the wind turbine body, the surface of the rotating rod being fixedly connected to a driving bevel gear, and the driving bevel gear being meshed with driven bevel gears on all four sides.

[0007] Furthermore, a movable gear is fixedly connected to the top of the rotating rod, a driving motor is provided on the top of the movable gear, and an output end of the driving motor is fixedly connected to the top of the rotating rod.

[0008] Furthermore, a movable shaft is fixedly connected to the interior of the driven bevel gear, and a limit frame is fixedly connected to the surface of the mounting frame.

[0009] Furthermore, a screw rod is provided inside the limit frame, and one side of the screw rod is fixedly connected to one side of the movable shaft.

[0010] Furthermore, a movable block is threadedly connected to the surface of the screw rod, a movable rod is fixedly connected to the top of the movable block, and a connecting plate is fixedly connected to the side of the movable rod away from the installation frame.

[0011] Furthermore, a wind collecting plate is fixedly connected to the surface of the connecting plate, and pads are fixedly connected to the four sides of the interior of the protective frame.

[0012] Furthermore, a buffer spring is fixedly connected to the surface of the pad, a mounting plate is fixedly connected to one side of the buffer spring, and sound-absorbing cotton is fixedly connected to the surface of the mounting plate. The sound-absorbing cotton is arranged around the driving motor.

[0013] Compared with the prior art, the advantages and positive effects of the present invention are:

[0014] 1. In the present invention, a telescopic adjustment device is provided. When the device is in use, the wind force can be collected by the wind collecting plate first, and at the same time, the movable gear can be driven to rotate by the output end of the driving motor, so that the rotating rod can be operated, thereby driving the active bevel gear to rotate, and at the same time, the driven bevel gear will be driven to rotate at the same time. While rotating, the movable shaft will be driven to operate, thereby driving the screw rod inside the limit frame to operate, thereby driving the movable block to move left and right, and the movable rod and the connecting plate to move through the movable block, so that the wind collecting plate can be telescopically moved forward and backward. At the same time, the driving motor can be preliminarily soundproofed by the pad and buffer spring inside the protective frame, and then the noise generated by it can be further absorbed by the sound-absorbing cotton. The blade length can be extended and retracted by the telescopic adjustment device to adjust the windward area according to the real-time wind speed. When the wind speed is low, the blade is extended forward, and the airflow energy capture efficiency is improved by increasing the effective wind collecting area. When a specific noise frequency band is detected, the telescopic mechanism can adjust the blade extension length in real time, so that the wind wheel rotation frequency deviates from the resonance range, thereby reducing the radiation noise generated by structural resonance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of a vertical axis wind turbine noise reduction device proposed by the present invention;

[0016] Figure 2 A schematic structural diagram of a telescopic adjustment device for a vertical axis wind turbine noise reduction device proposed in the present invention;

[0017] Figure 3 This is a partial structural diagram of a telescopic adjustment device for a vertical axis wind turbine noise reduction device proposed by the present invention;

[0018] Figure 4 This is a schematic diagram of the partial structure of a vertical axis wind turbine noise reduction device proposed by the present invention;

[0019] Figure 5 The present invention proposes a noise reduction device for a vertical axis wind turbine Figure 4 Enlarged view of point A in the middle.

[0020] Legend:

[0021] 1. Base; 2. Wind turbine body; 3. Mounting frame; 4. Protective frame; 5. Telescopic adjustment device; 501. Rotating rod; 502. Movable gear; 503. Driving motor; 504. Active bevel gear; 505. Driven bevel gear; 506. Movable shaft; 507. Limiting frame; 508. Screw; 509. Movable block; 510. Movable rod; 511. Connecting plate; 512. Wind collecting plate; 513. Pad; 514. Buffer spring; 515. Mounting plate; 516. Sound-absorbing cotton. DETAILED DESCRIPTION

[0022] See also Figures 1-5 The present invention provides a technical solution: a vertical axis wind turbine noise reduction device, comprising a base 1 and a wind turbine body 2, the wind turbine body 2 being fixedly connected to the surface of the base 1, a mounting frame 3 being fixedly connected to the upper surface of the wind turbine body 2, a protective frame 4 being fixedly connected to the top of the mounting frame 3, and a telescopic adjustment device 5 being provided inside the mounting frame 3.

[0023] The specific setting and function of the telescopic adjustment device 5 will be described in detail below.

[0024] In this embodiment, the telescopic adjustment device 5 includes a rotating rod 501, which is rotatably connected to the upper surface of the wind turbine body 2. The surface of the rotating rod 501 is fixedly connected to a driving bevel gear 504, and the driving bevel gear 504 is meshed with driven bevel gears 505 on all four sides.

[0025] Specifically, the top of the rotating rod 501 is fixedly connected to a movable gear 502 , and the top of the movable gear 502 is provided with a driving motor 503 .

[0026] Specifically, the interior of the driven bevel gear 505 is fixedly connected to a movable shaft 506 , and the surface of the mounting frame 3 is fixedly connected to a limiting frame 507 .

[0027] Specifically, a screw rod 508 is provided inside the limiting frame 507 , and one side of the screw rod 508 is fixedly connected to one side of the movable shaft 506 .

[0028] Specifically, the surface of the screw rod 508 is threadedly connected to the movable block 509 , the top of the movable block 509 is fixedly connected to the movable rod 510 , and the side of the movable rod 510 away from the installation frame 3 is fixedly connected to the connecting plate 511 .

[0029] Specifically, the surface of the connecting plate 511 is fixedly connected with the wind collecting plate 512 , and the inner four sides of the protective frame 4 are fixedly connected with the pads 513 .

[0030] Specifically, a buffer spring 514 is fixedly connected to the surface of the pad 513 , a mounting plate 515 is fixedly connected to one side of the buffer spring 514 , and a sound-absorbing cotton 516 is fixedly connected to the surface of the mounting plate 515 .

[0031] The effect achieved by the above components is: by setting the telescopic adjustment device 5, the output end of the driving motor 503 drives the movable gear 502 to rotate, so that its rotating rod 501 is operated, thereby driving the active bevel gear 504 to rotate, and at the same time, driving the driven bevel gear 505 to rotate at the same time, so that it drives the screw rod 508 inside the limit frame 507 to operate, thereby driving the movable block 509 to move left and right, and driving the movable rod 510 and the connecting plate 511 to move through the movable block 509, so that its wind collecting plate 512 is telescopically moved forward and backward, thereby making its wind collecting plate 512 move forward and backward, increasing the flexibility of the device.

[0032] Working principle: by setting the telescopic adjustment device 5, when the device is in use, the wind can be collected by the wind collecting plate 512 at first, and at the same time, the output end of the driving motor 503 can be used to drive the movable gear 502 to rotate, so that the rotating rod 501 can be operated, thereby driving the active bevel gear 504 to rotate, and at the same time, driving the driven bevel gear 505 to rotate at the same time, and driving the movable shaft 506 to operate while rotating, thereby driving the screw rod 508 inside the limit frame 507 to operate, thereby driving the movable block 509 to move left and right, and driving the movable rod 510 and the connecting plate 511 to move through the movable block 509, so as to realize the rotation of the movable block 509. The wind collecting plate 512 can be telescoped and moved back and forth. At the same time, the driving motor 503 can be preliminarily soundproofed by the pad 513 and the buffer spring 514 inside the protective frame 4, and the noise generated by it can be further absorbed by the sound-absorbing cotton 516. The blade length can be telescopically adjusted according to the real-time wind speed through the telescopic adjustment device 5. When the wind speed is low, the blades are extended forward to increase the effective wind collecting area to improve the airflow energy capture efficiency. When a specific noise frequency band is detected, the telescopic mechanism can adjust the blade extension length in real time to make the wind wheel rotation frequency deviate from the resonance range, thereby reducing the radiation noise caused by structural resonance.

Claims

1. A vertical axis wind turbine noise reduction device, comprising a base (1) and a wind turbine body (2), characterized in that: The wind turbine body (2) is fixedly connected to the surface of the base (1); the upper surface of the wind turbine body (2) is fixedly connected to a mounting frame (3); the top of the mounting frame (3) is fixedly connected to a protective frame (4); a telescopic adjustment device (5) is provided inside the mounting frame (3); the telescopic adjustment device (5) comprises a rotating rod (501); the rotating rod (501) is rotatably connected to the upper surface of the wind turbine body (2); a driving bevel gear (504) is fixedly connected to the surface of the rotating rod (501); and the driving bevel gear (504) is meshedly connected to driven bevel gears (505) on all four sides.

2. The vertical axis wind turbine noise reduction device according to claim 1, characterized in that: The top of the rotating rod (501) is fixedly connected to a movable gear (502), and the top of the movable gear (502) is provided with a driving motor (503).

3. The vertical axis wind turbine noise reduction device according to claim 2, characterized in that: The interior of the driven bevel gear (505) is fixedly connected to a movable shaft (506), and the surface of the mounting frame (3) is fixedly connected to a limiting frame (507).

4. The vertical axis wind turbine noise reduction device according to claim 3, characterized in that: A screw rod (508) is provided inside the limiting frame (507), and one side of the screw rod (508) is fixedly connected to one side of the movable shaft (506).

5. The vertical axis wind turbine noise reduction device according to claim 4, characterized in that: The surface of the screw rod (508) is threadedly connected to a movable block (509), the top of the movable block (509) is fixedly connected to a movable rod (510), and the side of the movable rod (510) away from the installation frame (3) is fixedly connected to a connecting plate (511).

6. The vertical axis wind turbine noise reduction device according to claim 5, characterized in that: The surface of the connecting plate (511) is fixedly connected to a wind collecting plate (512), and the inner periphery of the protective frame (4) is fixedly connected to backing plates (513).

7. The vertical axis wind turbine noise reduction device according to claim 6, characterized in that: A buffer spring (514) is fixedly connected to the surface of the pad (513), a mounting plate (515) is fixedly connected to one side of the buffer spring (514), and a sound-absorbing cotton (516) is fixedly connected to the surface of the mounting plate (515).

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