Blade-adjustable vertical shaft type wind power generation equipment

Abstract

The invention discloses vertical shaft type wind power generation equipment with adjustable blades, belongs to the technical field of vertical shaft type wind power generation, and particularly relates to an all-weather adjustable vertical shaft type wind power generation structure suitable for a low-wind-speed environment. The invention provides vertical shaft type wind power generation equipment capable of adjusting the effective working area of blades. The wind power generation device comprises a tower (8), a generator (5) and a support pipe (4) are arranged on the tower (8), blades (3) are connected to the outer end of the support pipe (4), and the wind power generation device is characterized in that an expansion blade device (1) capable of adjusting the effective working area of the blades is arranged on the tower (8).

Description

Technical Field

[0001] This invention belongs to the field of vertical axis wind power generation technology, and particularly relates to an all-weather adjustable vertical axis wind power generation structure suitable for low wind speed environments. Background Technology

[0002] The application of vertical axis wind turbines aligns with global energy development trends and specific scenario requirements. Against the backdrop of a global push for renewable energy development, they are becoming increasingly important in the energy sector as a clean and sustainable energy source. They require no wind contact, automatically adapt to wind direction changes, and are simple in structure, have a low center of gravity, low noise, and are easy to build and maintain, making them suitable for special scenarios such as urban distributed power generation and complex terrain areas. However, vertical axis wind turbines have relatively high starting wind speeds and weak starting capabilities in low-wind-speed environments. This limits their widespread application in low-wind-speed areas, necessitating further improvements in their starting performance.

[0003] In recent years, with the continuous development of vertical axis wind turbine technology, many research institutions have developed structures that adjust the blade angle of attack according to wind speed. For example, patent CN 202510582704.2 discloses "an adjustable vertical axis wind turbine". This device can adjust the position and center of gravity of the blades according to different usage conditions. It is easier to start and rotate in a stationary state. It can also improve the effective utilization of wind energy and increase efficiency by adjusting the blade angle. However, this device mainly adjusts the blade angle and has limited help for low-speed start-up. Summary of the Invention

[0004] The present invention addresses the above-mentioned problems by providing a vertical axis wind power generation device with adjustable blade effective working area.

[0005] To achieve the above objectives, the present invention adopts the following technical solution. The present invention includes a tower (8), on which a generator (5) and a support tube (4) are provided. The outer end of the support tube (4) is connected to a blade (3). The present invention is characterized in that an extension blade device (1) with adjustable effective working area of ​​the blade is provided on the tower (8).

[0006] As a preferred embodiment, the extended blade device (1) of the present invention includes an extender housing (16), and an extended blade (14) is provided on the extender housing (16) that can extend vertically out of the extender housing (16).

[0007] As another preferred embodiment, the inner wall of the extender housing (16) of the present invention is provided with a side pulley (15), the middle part of the extender housing (16) is provided with a driving wheel (10), a driven wheel (12) and a middle pulley (17), and the extender housing (16) is provided with an extender blade fixer (11). The expansion blade (14) is installed inside the expander housing (16). The outer wall of the expansion blade (14) contacts the side pulley (15). A vertical rack (13) is provided on the expansion blade (14). The rack (13) cooperates with the driving wheel (10) and the driven wheel (12). The back of the rack (13) contacts the middle pulley (17).

[0008] As another preferred embodiment, the driving wheel (10) of the present invention is disposed above the driven wheel (12); there are multiple driven wheels (12), side pulleys (15) and middle pulleys (17) arranged vertically; the extension blade holder (11) is disposed between the uppermost driven wheel (12) and the driving wheel (10).

[0009] As another preferred embodiment, the detection signal output port of the speed sensor (6) of the generator (5) of the present invention is connected to the detection signal input port of the controller (9); The detection signal output port of the real-time wind speed monitoring device (2) at the upper end of the tower (8) is connected to the detection signal input port of the controller (9); The control signal output port of the controller (9) is connected to the control signal input port of the brake device (7) on the tower (8) and the control signal input port of the drive wheel control motor that controls the rotation of the drive wheel (10).

[0010] As another preferred solution, the wind speed real-time monitoring device (2) and the speed sensor (6) of the present invention transmit the real-time measured wind speed and generator (5) speed data to the controller (9). When the wind speed is detected to be lower than 5m / s, the controller (9) controls the active wheel control motor to open the extension blade device (1) to the maximum, that is, the extension blade (14) extends to the maximum. When the wind speed is between 5 and 25 m / s, the controller (9) controls the active wheel control motor to increase the opening of the extension blade device (1) by 20%, that is, the extension blade (14) extends by 20% of its maximum length; at the same time, the speed sensor (6) monitors whether the speed of the generator (5) is higher than 80 RPM. If it is lower than 80 RPM, the opening of the extension blade device (1) is increased by 20%. If it is higher than 80 RPM, the opening of the extension blade device (1) is increased by 5%, until the speed of the generator (5) reaches 120 RPM. When the generator (5) speed is higher than 120 RPM, the opening of the extension blade device (1) is reduced by 5% until it is balanced; the extension blade (14) is moved to the designated position by using the driving wheel (10), extension blade holder (11), driven wheel (12), and rack (13) in the extension blade device (1) based on the real-time wind speed fed back by the wind speed real-time monitoring device (2); when the extension blade (14) rises to the designated position, the locking tongue of the extension blade holder (11) extends and presses against the rack (13), so that the extension blade (14) is fixed in this position; When the wind speed is greater than 25 m / s, the controller (9) receives the detection signal from the speed sensor (6) and detects whether the speed of the generator (5) is higher than 150 RPM. If it is higher than 150 RPM, the controller (9) controls the opening of the brake device (7) to increase by 10% until the speed of the generator (5) is lower than 150 RPM. If it is lower than 150 RPM, the opening of the extension blade device (1) is reduced by 5%, and then the opening of the brake device (7) is reduced by 5%, and the above operation is repeated. Finally, when the wind speed is higher than 25 m / s, the generator (5) speed is kept within the safe and efficient working range below 150 RPM.

[0011] As another preferred embodiment, the generator (5) of the present invention is a permanent magnet synchronous generator with a power range of 10 to 100 kW, a normal rated operating speed range of 80 to 120 RPM, and a maximum speed of 150 RPM.

[0012] As another preferred embodiment, the blade (3) of the present invention is made of reinforced fiberglass, aluminum alloy or carbon fiber composite material, with a Darrieus-shaped curve in cross section, and five blades are connected by a support tube (4) in a circular arrangement; the diameter ranges from 6.8m to 12m; the length of a single blade (3) ranges from 5 to 15m, and the chord width (the widest part of the blade) is from 1m to 3m; the extender housing (16) and the blade (3) are fixedly connected by screws.

[0013] Secondly, the extended blade (14) of the present invention is made of aluminum alloy or carbon fiber composite material, with a Darrieus-shaped curve in cross section, a length range of 2m-6m, and a maximum extendable length of 3.3m to 11m; the chord width (the widest part of the blade) is 0.8m to 2.7m, and the extended blade (14) and the rack (13) are fixedly connected by screws.

[0014] In addition, the real-time wind speed monitoring device (2) described in this invention is a three-cup wind speed sensor.

[0015] The beneficial effects of this invention.

[0016] This invention, by incorporating a blade extension device with an adjustable effective working area, can expand the effective working area of ​​the blades according to specific conditions, thereby broadening the applicability of the wind turbine. For example, increasing the effective working area of ​​the blades at low wind speeds enables rapid start-up; or increasing the effective working area of ​​the blades at the rated operating wind speed allows the generator to quickly reach its high-efficiency power generation range, improving power generation efficiency. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The scope of protection of the present invention is not limited to the following description.

[0018] Figure 1 This is a simplified diagram of the adjustable blade vertical axis wind power generation device of the present invention.

[0019] Figure 2 This is a front view of the internal structure of the blade extension device under high wind speed conditions.

[0020] Figure 3 This is a front view of the internal structure of the blade extension device under low wind speed conditions.

[0021] Figure 4 This is a side view of the internal structure of the blade extension device under high wind speed conditions.

[0022] Figure 5 This is a 3D view of the internal structure of the blade extension device.

[0023] Figure 6 This is a logic diagram of the execution strategy for adjustable blade vertical axis wind power generation equipment.

[0024] Figure 7 This is the execution logic diagram for the extended blade device. Detailed Implementation

[0025] like Figure 1 As shown, the present invention includes a tower (8), on which a generator (5) and a support tube (4) are provided. The outer end of the support tube (4) is connected to a blade (3), and an extension blade device (1) is provided on the tower (8).

[0026] The extended blade device (1) includes an extender housing (16), on which an extended blade (14) is provided that can extend vertically out of the extender housing (16). As another preferred embodiment, a side pulley (15) is provided on the inner wall of the extender housing (16), and a driving wheel (10), a driven wheel (12) and a middle pulley (17) are provided in the middle of the extender housing (16). An extended blade retainer (11) is provided inside the extender housing (16). The expansion blade (14) is installed inside the expander housing (16). The outer wall of the expansion blade (14) contacts the side pulley (15). A vertical rack (13) is provided on the expansion blade (14). The rack (13) cooperates with the driving wheel (10) and the driven wheel (12). The back of the rack (13) contacts the middle pulley (17).

[0027] The driving wheel (10) is positioned above the driven wheel (12); there are multiple driven wheels (12), side pulleys (15), and central pulleys (17) arranged vertically; the extension blade retainer (11) is positioned between the uppermost driven wheel (12) and the driving wheel (10). The structure of multiple sets of driven wheels (12) and pulleys further improves the stability of the extension blade (14) and reliably ensures that the extension blade (14) can only move up and down.

[0028] The detection signal output port of the speed sensor (6) of the generator (5) (the existing generator integrated speed sensor) is connected to the detection signal input port of the controller (9); The detection signal output port of the real-time wind speed monitoring device (2) at the upper end of the tower (8) (the real-time wind speed monitoring device (2) can be connected to the upper end of the tower (8) by screws) is connected to the detection signal input port of the controller (9); The control signal output port of the controller (9) is connected to the control signal input port of the brake device (7) on the tower (8) (the brake device can adopt a brake disc structure, and existing vertical axis wind power generation equipment is equipped with a brake disc structure) and the control signal input port of the drive wheel control motor that controls the rotation of the drive wheel (10).

[0029] This invention, by incorporating components such as a real-time wind speed monitoring device and a blade extension device, automatically controls the blade extension device, braking device, and extension blade holder according to a predetermined execution strategy logic based on real-time wind speed and generator speed data. This enables rapid start-up at extremely low wind speeds; allows the generator to quickly reach its high-efficiency power generation range at rated operating wind speeds, improving power generation efficiency; and controls the braking device to take immediate braking measures when the generator speed is too high, preventing accidents caused by overspeeding and ensuring that the equipment maintains a highly efficient, safe, and stable operating state in all weather conditions.

[0030] When the controller (9) sends an increase / decrease command to the extension blade device (1), the extension blade retainer (11) moves to the fully closed position. Then, the drive wheel (10) rotates clockwise / counterclockwise, driving the meshing rack (13) and the extension blade (14) fixed thereto to move outward / inward. At this time, the pulley (15) in contact with the extension blade (14), the pulley (15) in contact with the rack (13), and the driven wheel (12) all move passively until they reach the designated position. At this time, the extension blade retainer (11) moves to the fully open position, and the command ends.

[0031] The wind speed real-time monitoring device (2) and the speed sensor (6) transmit the real-time measured wind speed and generator (5) speed data to the controller (9). When the wind speed is detected to be below 5 m / s, the controller (9) controls the drive wheel control motor to open the extension blade device (1) to the maximum, that is, the extension blade (14) extends to the maximum; ensuring that the equipment can be started quickly with extremely low wind speed and expand the working range of the equipment.

[0032] When the wind speed is between 5 and 25 m / s, the controller (9) controls the drive wheel control motor to increase the opening of the extension blade device (1) by 20%, that is, the extension blade (14) extends by the maximum 20% of its length; at the same time, the speed sensor (6) monitors whether the speed of the generator (5) is higher than 80 RPM. If it is low, the opening of the extension blade device (1) is increased by 20%; if it is high, the opening of the extension blade device (1) is increased by 5%, until the speed of the generator (5) reaches 120 RPM; when the speed of the generator (5) is higher than 120 RPM, the opening of the extension blade device (1) is reduced by 5%, until it is balanced. This wind speed range is the rated operating range of the wind turbine. The wind speed is fed back by the real-time wind speed monitoring device (2). The extended blade (14) is moved quickly and accurately to the designated position by using the drive wheel (10), extended blade holder (11), driven wheel (12), and rack (13) in the extended blade device (1). The opening of the extended blade device (1) can be precisely adjusted according to different wind speeds, so that the all-weather adjustable blade vertical axis wind power generation equipment can quickly increase the generator speed within the rated wind speed range, so that the equipment can always maintain a high-efficiency state, improve power generation efficiency, and improve the economic efficiency of the equipment.

[0033] When the extension blade (14) rises to the set position, the locking tongue of the extension blade retainer (11) extends and presses against the rack (13), thus fixing the extension blade (14) in this position. Whether the set position has been reached can be controlled by the feedback signal of the encoder of the drive wheel control motor (i.e., the drive wheel is controlled to rotate a certain number of revolutions and then stop by the encoder feedback signal controller (9)). The extension blade retainer (11) provides an additional locking safety. The extension blade retainer (11) can be a telescopic device, which is equivalent to a brake device. Because the rotation speed is high when the wind speed is high, the extension blade retainer (11) is set to avoid the accident of the extension blade (14) being thrown out due to excessive centrifugal force.

[0034] When the wind speed is greater than 25 m / s, the controller (9) receives the detection signal from the speed sensor (6) and checks whether the speed of the generator (5) is higher than 150 RPM. If it is higher than 150 RPM, the opening of the brake device (7) is increased by 10% until the speed of the generator (5) is lower than 150 RPM. If it is lower than 150 RPM, the opening of the extension blade device (1) is reduced by 5%, and then the opening of the brake device (7) is reduced by 5%, and the above operation is repeated. In the end, when the wind speed is higher than 25 m / s, the speed of the generator (5) is kept within the safe and efficient operating range below 150 RPM, thereby improving the safety and stability of the equipment operation.

[0035] The generator (5) is a permanent magnet synchronous generator with a power range of 10 to 100 kW, a normal rated operating speed range of 80 to 120 RPM, and a maximum speed of 150 RPM.

[0036] The blades (3) are made of reinforced fiberglass, aluminum alloy, or carbon fiber composite material, with a Darrieus-shaped curve in cross-section. There are five blades in total, connected by a support tube (4) in a circular arrangement. The diameter ranges from 6.8m to 12m. The length of a single blade (3) ranges from 5m to 15m, and the chord width (widest part of the blade) is from 1m to 3m. The extender housing (16) is fixedly connected to the blades (3) by screws. The extender housing (16) can be welded to the support tube (4).

[0037] like Figure 1 As shown, an extension blade device (1) can be provided on the upper and lower parts of the inner side of each blade (3). The upper extension blade device (1) extends the extension blade (14) upward, and the lower extension blade device (1) extends the extension blade (14) downward.

[0038] The extended blades (14) are made of aluminum alloy or carbon fiber composite material, with a Darrieus-shaped curve in cross-section, a length range of 2m to 6m, and a maximum extendable length (i.e., the size of the upper and lower extended blades 14 after unfolding) of 3.3m to 11m; the chord width (the widest part of the blade) is 0.8m to 2.7m (e.g., ...). Figure 5 As shown, the cross-sectional shape of the extended blade 14 can be the same as that of the blade 3. The extended blade (14) and the rack (13) are fixedly connected by screws.

[0039] The real-time wind speed monitoring device (2) is a three-cup wind speed sensor, consisting of three hemispherical or conical lightweight cups (commonly made of polycarbonate or carbon fiber), symmetrically distributed at 120°, with a cup diameter of 50 mm to 100 mm and a measurement accuracy of ±(0.3+0.03V)m / s.

[0040] This embodiment takes a factory as an example. The factory area is surrounded by large buildings and the wind is relatively weak. The efficiency of traditional wind turbines is too low. The invention describes the installation of an all-weather adjustable blade vertical axis wind power generation device in the factory area.

[0041] During equipment operation, the system automatically collects measurement data from the real-time wind speed monitoring device and the rotation speed sensor, and transmits it to the controller for analysis. When the wind speed is detected to be below 5 m / s, the controller issues a command according to the operating strategy to open the extension blade device to its maximum, ensuring that the equipment can be started quickly using extremely low wind speeds and expanding the equipment's operating range.

[0042] When the wind speed is between 5 and 25 m / s, the controller sends a command according to the operating strategy to increase the opening of the extended blade device by 20%. Simultaneously, the speed sensor monitors whether the generator speed is above 80 RPM. If it is lower, the opening of the extended blade device is increased by 20%; if it is higher, it is increased by 5%, until the generator speed reaches 120 RPM. If the generator speed exceeds 120 RPM, the opening of the extended blade device is reduced by 5% until a balance is reached. This wind speed range is the rated operating range of the wind turbine. By adjusting the opening of the extended blade device at different wind speeds, the equipment is kept at its highest efficiency, improving power generation efficiency and the economic efficiency of the equipment.

[0043] When the wind speed exceeds 25 m / s, the controller sends out instructions according to the operating strategy. It then checks if the generator speed is above 150 RPM. If it is, the braking device opening increases by 10% until the generator speed drops below 150 RPM. If it is below 150 RPM, the expansion blade device opening decreases by 5%, and then the braking device opening decreases by 5%, repeating the above operation. Ultimately, this ensures that when the wind speed is above 25 m / s, the generator speed remains within the safe and efficient operating range below 150 RPM, improving the safety and stability of the equipment operation.

[0044] The all-weather adjustable blade vertical axis wind power generation equipment designed using this invention can reduce the starting wind speed of vertical axis wind power generation equipment by 40%, while expanding the safe operating range of the wind turbine. The power generation efficiency of the equipment at low wind speeds is increased by 35%, reducing the risk of system overspeed and improving the safety, economy and stability of the equipment in all-weather conditions.

[0045] like Figure 2 As shown, a base plate can be provided at the lower end of the expander housing (16), with only the expansion blade 14 having an empty extension direction, while the others have plates.

[0046] The extension blade retainer (11) can also be controlled by the controller (9). The drive part of the extension blade retainer (11) adopts an electronic lock telescopic DC motor. The controller (9) controls the electronic lock telescopic DC motor, and then controls the extension and retraction of the lock tongue.

[0047] The extender blade retainer (11) and the extender housing (16) can be fixed with screws.

[0048] like Figure 5 As shown, the rack (13) can be set on the outer wall of the extension blade (14) and fixed by screws.

[0049] It is understood that the above specific description of the present invention is only for illustrating the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention to achieve the same technical effect; as long as the use needs are met, they are all within the protection scope of the present invention.

Claims

1. An adjustable blade vertical axis wind power generation device, comprising a tower (8), a generator (5) and a support tube (4) mounted on the tower (8), and blades (3) connected to the outer end of the support tube (4), characterized in that... The tower (8) is equipped with an extended blade device (1) that allows for adjustment of the effective working area of ​​the blades.

2. The adjustable blade vertical axis wind power generation device according to claim 1, characterized in that... The extended blade device (1) includes an extender housing (16) and an extended blade (14) that can extend vertically out of the extender housing (16).

3. The adjustable blade vertical axis wind power generation device according to claim 2, characterized in that... The inner wall of the expander housing (16) is provided with a side pulley (15), the middle part of the expander housing (16) is provided with a drive wheel (10), a driven wheel (12) and a middle pulley (17), and the expander housing (16) is provided with an expander blade fixer (11). The expansion blade (14) is installed inside the expander housing (16). The outer wall of the expansion blade (14) contacts the side pulley (15). A vertical rack (13) is provided on the expansion blade (14). The rack (13) cooperates with the driving wheel (10) and the driven wheel (12). The back of the rack (13) contacts the middle pulley (17).

4. The adjustable blade vertical axis wind power generation device according to claim 3, characterized in that... The driving wheel (10) is positioned above the driven wheel (12); there are multiple driven wheels (12), side pulleys (15) and middle pulleys (17) arranged vertically; the extension blade retainer (11) is positioned between the uppermost driven wheel (12) and the driving wheel (10).

5. The adjustable blade vertical axis wind power generation device according to claim 1, characterized in that... The detection signal output port of the speed sensor (6) of the generator (5) is connected to the detection signal input port of the controller (9); The detection signal output port of the real-time wind speed monitoring device (2) at the upper end of the tower (8) is connected to the detection signal input port of the controller (9); The control signal output port of the controller (9) is connected to the control signal input port of the brake device (7) on the tower (8) and the control signal input port of the drive wheel control motor that controls the rotation of the drive wheel (10).

6. The adjustable blade vertical axis wind power generation device according to claim 5, characterized in that... The wind speed real-time monitoring device (2) and the speed sensor (6) transmit the real-time measured wind speed and generator (5) speed data to the controller (9). When the wind speed is detected to be lower than 5m / s, the controller (9) controls the active wheel control motor to open the extension blade device (1) to the maximum, that is, the extension blade (14) extends to the maximum. When the wind speed is between 5 and 25 m / s, the controller (9) controls the active wheel control motor to increase the opening of the extension blade device (1) by 20%, that is, the extension blade (14) extends by 20% of its maximum length; at the same time, the speed sensor (6) monitors whether the speed of the generator (5) is higher than 80 RPM. If it is lower than 80 RPM, the opening of the extension blade device (1) is increased by 20%. If it is higher than 80 RPM, the opening of the extension blade device (1) is increased by 5%, until the speed of the generator (5) reaches 120 RPM. When the generator (5) speed is higher than 120 RPM, the opening of the extension blade device (1) is reduced by 5% until it is balanced; the extension blade (14) is moved to the designated position by using the driving wheel (10), extension blade holder (11), driven wheel (12), and rack (13) in the extension blade device (1) based on the real-time wind speed fed back by the wind speed real-time monitoring device (2); when the extension blade (14) rises to the designated position, the locking tongue of the extension blade holder (11) extends and presses against the rack (13), so that the extension blade (14) is fixed in this position; When the wind speed is greater than 25 m / s, the controller (9) receives the detection signal from the speed sensor (6) and detects whether the speed of the generator (5) is higher than 150 RPM. If it is higher than 150 RPM, the controller (9) controls the opening of the brake device (7) to increase by 10% until the speed of the generator (5) is lower than 150 RPM. If it is lower than 150 RPM, the opening of the extension blade device (1) is reduced by 5%, and then the opening of the brake device (7) is reduced by 5%, and the above operation is repeated. Finally, when the wind speed is higher than 25 m / s, the generator (5) speed is kept within the safe and efficient working range below 150 RPM.

7. The adjustable blade vertical axis wind power generation device according to claim 1, characterized in that... The generator (5) is a permanent magnet synchronous generator with a power range of 10 to 100 kW, a normal rated operating speed range of 80 to 120 RPM, and a maximum speed of 150 RPM.

8. The adjustable blade vertical axis wind power generation device according to claim 1, characterized in that... The blade (3) is made of reinforced fiberglass, aluminum alloy or carbon fiber composite material, with a Darrieus-shaped curve in cross section, and there are five blades in total. They are connected by support tubes (4) and arranged in a circular pattern. The diameter ranges from 6.8 m to 12 m. The length of a single blade (3) ranges from 5 m to 15 m, and the chord width (the widest part of the blade) is from 1 m to 3 m. The extender housing (16) is fixedly connected to the blade (3) by screws.

9. The adjustable blade vertical axis wind power generation device according to claim 2, characterized in that... The extended blade (14) is made of aluminum alloy or carbon fiber composite material, with a Darrieus-shaped curve in cross section, a length range of 2m to 6m, and a maximum extendable length of 3.3m to 11m; the chord width is 0.8m to 2.7m, and the extended blade (14) and the rack (13) are fixedly connected by screws.

10. An adjustable blade vertical axis wind power generation device according to claim 5, characterized in that... The real-time wind speed monitoring device (2) is a three-cup wind speed sensor.

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