A multi-axis wind power generation device with cyclically adjustable rotor height

Abstract

This invention discloses a multi-axis wind power generation device with cyclically adjustable rotor height, comprising a main rotor, a rotating frame, and several sub-rotors. The main rotor is mounted on the top of the tower. The rotating frame is coaxially arranged with the main rotor, and spaced apart from the main rotor in the axial direction. A transmission device is provided on the main rotor, and the main rotor's shaft can drive the rotating frame to rotate around its own axis via the transmission device. Several sub-rotors are arranged in a circumferential array on the side of the rotating frame near the main rotor. When the main rotor's shaft drives the rotating frame to rotate via the rotating structure, the height position of each sub-rotor can be changed. Through the cooperation between the rotating frame and the transmission device, the height of the sub-rotors can be cyclically changed to avoid uneven wear and achieve uniform aging.

Description

Technical Field

[0001] This invention belongs to the technical field of wind power generation equipment, and more specifically, it is a multi-axis wind power generation device with cyclically adjustable wind turbine height. Background Technology

[0002] In the field of wind power generation, multi-axis wind turbines, with their design of multiple rotors independently capturing wind energy, effectively improve the wind energy utilization rate per unit space, becoming one of the important technological development directions. In existing technologies, multi-axis wind turbines generally employ a layout of multiple rotors of the same specifications. Each rotor is fixedly installed in a different position via independent brackets or support structures, and its installation height and spatial attitude remain fixed for a long period once commissioned. However, there is a significant vertical gradient difference in wind speed near the ground; that is, as altitude increases, wind speed typically increases, and the corresponding wind load also increases. Rotors at different heights will bear differentiated wind loads over a long period: rotors at higher positions bear a greater load continuously, leading to faster wear on key components such as blades and shafts, and making them prone to fatigue damage; while rotors at lower positions operate at lower loads due to a smaller load, resulting in an imbalance in the overall stress and losses of the equipment. The uneven wear caused by this fixed layout results in varying aging rates among the wind turbines. Even if some turbines are still functioning normally, overall maintenance or replacement is necessary due to damage to individual high-load turbines, significantly shortening the overall lifespan of the equipment and increasing maintenance costs. Simultaneously, the alternation of day and night, seasonal changes, and differences in terrain across regions can all alter the vertical distribution characteristics of near-ground wind speeds. When the vertical wind speed gradient changes, the fixed-installed turbines cannot flexibly adjust their positions to adapt to the optimal wind speed zone. This leads to either overloaded operation of high-position turbines and low-position turbines with low power generation efficiency, or a single overall cutoff wind speed threshold preventing stable power generation during wind speed fluctuations. This severely limits the equipment's applicability and power generation stability, impacting overall power generation efficiency. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides a multi-axis wind power generation device with cyclically adjustable rotor height. Through the cooperation between the rotating frame and the transmission device, the rotor height can be changed periodically to avoid wear differences and achieve uniform aging.

[0004] Technical Solution: To achieve the above objectives, the present invention provides a multi-axis wind power generation device with cyclically adjustable rotor height, comprising a main rotor, a rotating frame, and several sub-rotors. The main rotor is mounted on the top of the tower column. The rotating frame is coaxially arranged with the main rotor, and the rotating frame and the main rotor are spaced apart in the axial direction. A transmission device is provided on the main rotor, and the shaft of the main rotor can drive the rotating frame to rotate around its own axis through the transmission device. Several sub-rotors are installed in a circumferential array on the side of the rotating frame close to the main rotor. When the shaft of the main rotor drives the rotating frame to rotate through the transmission structure, the height position of each sub-rotor can be changed.

[0005] Furthermore, the rotating frame includes an inner ring and an outer ring, which are connected by a connecting structure. The inner ring and the outer ring form a sub-wheel mounting space. The bodies of a plurality of sub-wheels are arranged in a circumferential array in the sub-wheel mounting space and are fixedly clamped between the inner ring and the outer ring.

[0006] Furthermore, the transmission device includes a first gear, a second gear, a third gear, a connecting shaft, a toothed belt, and a support frame. The first gear is coaxially sleeved on the shaft of the main wheel. The support frame is fixedly installed on the upper surface of the main wheel housing. The connecting shaft is rotatably installed on the upper end of the support frame. The second gear and the third gear are coaxially sleeved on the connecting shaft, and the second gear and the third gear are spaced apart along the axis of the connecting shaft. The third gear is connected to the inner ring drive. In the assembled state, the second gear is directly above the first gear, and the first gear is connected to the second gear drive via the toothed belt.

[0007] Furthermore, the inner circumference of the inner ring is provided with meshing teeth that can engage with the third gear, and the meshing transmission between the third gear and the meshing teeth can drive the rotating frame to rotate.

[0008] Furthermore, it also includes a stop structure, which is installed directly below the rotating frame. The outer circumferential surface of the outer ring is provided with a plurality of stop grooves in a circular array corresponding to the stop structure. The limiting fit between the stop structure and the stop grooves can stop the rotating frame from rotating.

[0009] Furthermore, the stopping structure includes a mounting bracket, a pushing device, and a stopping block; the upper surface of the mounting bracket is an arc-shaped stopping surface adapted to the outer ring, and an arc-shaped buffer groove is formed on the stopping surface. The pushing device is slidably mounted in the buffer groove, and the stopping block is fixedly connected to the pushing end of the pushing device. The pushing device enables the stopping block to move in a direction close to the center of the outer ring, thereby allowing the stopping block to insert into the stopping groove on the outer ring and engage with the stopping groove for limiting.

[0010] Furthermore, the stop structure also includes a buffer device, with at least one buffer device disposed between one side of the pushing device and one wall of the buffer groove; when the pushing device drives the stop block to engage with the stop groove, the buffer device can buffer the impact force transmitted by the rotating frame.

[0011] Furthermore, the pushing device includes an electromagnet, a pushing spring, a pushing column, and a housing. The electromagnet is fixedly installed on the bottom surface inside the housing. A guide sleeve is provided at the end of the pushing column away from the electromagnet, and the pushing column is slidably fitted in the guide sleeve. The pushing spring is disposed around the electromagnet, with one end fixedly connected to the bottom surface inside the housing and the other end connected to the end face of the pushing column near the electromagnet. The pushing spring always exerts a force on the pushing column pointing towards the outer center of the ring. The stop block is fixedly connected to the end face of the pushing column away from the electromagnet. When the electromagnet is energized, it can drive the pushing column away from the outer center of the ring through attraction, compressing the pushing spring. When the electromagnet is de-energized, the pushing spring resets and pushes the pushing column, causing the stop block to move towards the outer center of the ring.

[0012] Furthermore, a one-way transmission structure is provided between the first gear and the shaft of the main wheel. The one-way transmission structure only allows the shaft of the main wheel to transmit force to the first gear, and prevents the force from being transmitted from the first gear to the shaft. When the pushing device drives the stop block to engage with the stop groove, the first gear, the second gear, the third gear, the connecting shaft and the toothed belt are all in a stationary state, while the shaft of the main wheel can still rotate normally.

[0013] Beneficial effects: Compared with the prior art, the multi-axis wind power generation device with cyclically adjustable rotor height of the present invention has the following beneficial effects:

[0014] 1. By using a transmission device to drive the rotating frame to make the sub-wheels rotate, the sub-wheels periodically pass through different height positions and alternately bear different wind loads, avoiding the wear differences caused by fixed installation, effectively achieving uniform aging of each sub-wheel and extending the overall service life of the equipment.

[0015] 2. Based on the unidirectional force transmission characteristics of the unidirectional transmission structure, when the stop structure brakes the rotating frame, the static torque of the transmission system cannot be transmitted in reverse to the main wheel shaft, and the main wheel can continue to rotate to generate electricity, avoiding the power generation interruption problem caused by traditional braking and greatly improving the overall power generation efficiency.

[0016] 3. By designing a difference in the radius between the main wheel and the sub-wheel, the entry wind speed thresholds of the two are different, which expands the operating wind speed range of the equipment and can adapt to the fluctuation of wind speed during the day and night and the wind conditions in different areas. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a multi-axis wind power generation device with cyclically adjustable rotor height according to the present invention;

[0018] Figure 2 This is a side view of a multi-axis wind power generation device with cyclically adjustable rotor height according to the present invention;

[0019] Figure 3 This is a schematic diagram of the assembly of the rotating frame and the transmission structure;

[0020] Figure 4 A schematic diagram of the stop structure;

[0021] Figure 5 A cross-sectional view of the actuating device. Detailed Implementation

[0022] The invention will now be further described with reference to the accompanying drawings.

[0023] like Figures 1-2 As shown, a multi-axis wind power generation device with adjustable rotor height includes a main rotor 1, a rotating frame 2, and several sub-rotors 3. The main rotor 1 is mounted on the top of a tower column 4. The rotating frame 2 is coaxially arranged with the main rotor 1, and the rotating frame 2 is spaced apart from the main rotor 1 in the axial direction. The area of ​​the rotating frame 2 is larger than the swept area of ​​the main rotor 1. A transmission device 5 is provided on the main rotor 1, and the rotating shaft 6 of the main rotor 1 can drive the rotating frame 2 to rotate around its own axis through the transmission device 5. Several sub-rotors 3 are installed in a circumferential array on the side of the rotating frame 2 near the main rotor 1. When the shaft 6 of the main wheel 1 drives the rotating frame 2 to rotate through the transmission structure 5, it can change the height position of each sub-wheel 3. More specifically, in the direction of airflow, the rotating frame 2 is located behind the main wheel 1. This allows for wind tunnel experiments to be conducted before installation to determine the optimal spacing between the rotating frame 2 and the main wheel 1. This ensures that each sub-wheel 3 is outside the wake region of the main wheel 1, but can still capture some of the airflow accelerated by the main wheel 1. Thus, the wind turbine described in this solution not only has the advantages of a coaxial multi-wheel wind turbine but also the advantages of a multi-shaft multi-wheel wind turbine.

[0024] like Figure 3As shown, the rotating frame 2 includes an inner ring 7 and an outer ring 8, which are connected by a connecting structure 9. The inner ring 7 and the outer ring 8 form a sub-wheel mounting space 10. A plurality of sub-wheels 3 are arranged in a circular array within the sub-wheel mounting space 10 and are fixedly clamped between the inner ring 7 and the outer ring 8. The connecting structure 9 can be a circular connecting plate or a plurality of connecting columns. If the connecting structure 9 is a connecting plate, it can strengthen the connection between the inner ring 7, the outer ring 8, and the sub-wheel 3, and can prevent… During rainless weather, rainwater can enter between the inner ring 7 and the outer ring 8, causing damage to the electrical components in the rotor 3. If the connecting structure 9 is a connecting column, several connecting columns can form a truss-like hollow structure between the inner ring 7 and the outer ring 8, thereby creating a space for gas flow and improving the overall aerodynamic performance of the wind power generation device described in this solution, thus increasing its efficiency in utilizing wind energy. The type of connecting structure 9 to be selected depends on the actual needs of the customer. The connecting structure 9 shown in the attached diagram of this solution is a connecting plate.

[0025] like Figure 3 As shown, the transmission device 5 includes a first gear 11, a second gear 12, a third gear 13, a connecting shaft 14, a toothed belt 15, and a support frame 16. These six components work together to form a multi-stage power transmission system. Through the functional division and cooperation of different components, efficient power transmission and speed regulation are achieved. The first gear 11 is coaxially mounted on the rotating shaft 6 of the main wheel 1, so that the rotational power of the fan blades of the main wheel 1 driving the rotating shaft 6 can be directly transmitted to the first gear 11, providing the initial power input for the transmission device 5. The support frame 16 is fixedly mounted on the upper surface of the main wheel 1's housing, and the connecting shaft 14 is rotatably mounted on the upper end of the support frame 16. The support frame 16 can provide stable support for the connecting shaft 14, ensuring the smooth operation of the transmission device 5. Each component does not shift under stress. The second gear 12 and the third gear 13 are coaxially mounted on the connecting shaft 14, and are spaced apart along the axis of the connecting shaft 14 to avoid mutual interference between the two gears during rotation, ensuring the meshing effect between each gear and its corresponding component. The third gear 13 is connected to the inner ring 7, thereby transmitting the power at the end of the transmission device 5 to the rotating frame 2, directly driving the rotating frame 2 to rotate. In the assembled state, the second gear 12 is directly above the first gear 11, and the first gear 11 is connected to the second gear 12 via a toothed belt 15. The toothed belt 15 has the characteristics of flexible transmission, which can buffer the impact during power transmission, thereby improving the smoothness of transmission.

[0026] like Figure 3As shown, the inner circumferential surface of the inner ring 7 is provided with meshing teeth 17 that can engage with the third gear 13, providing a meshing basis for the third gear. The meshing transmission between the third gear 13 and the meshing teeth 17 can drive the rotating frame 2 to rotate. The meshing teeth 17 are continuously distributed along the inner circumferential surface of the inner ring 7, so that the third gear 13 can form continuous meshing with it, ensuring that the rotational speed of the rotating frame 2 matches the rotational speed of the rotating shaft 6 in the main wheel 1, and ensuring that the height adjustment of each sub-wheel 3 has a certain regularity.

[0027] like Figure 1 and 2 As shown, it also includes a stop structure 18, which is installed directly below the rotating frame 2. The outer circumferential surface of the outer ring 8 is provided with a plurality of stop grooves 19 in a circular array corresponding to the stop structure 18, thereby providing multiple locking points for the stop structure 18 to meet the positioning requirements of the rotating frame at different angles. The limiting cooperation between the stop structure 18 and the stop grooves 19 can stop the rotating frame 2 from rotating; through the mechanical fitting limiting method, it is ensured that the rotating frame 2 can be reliably braked.

[0028] like Figure 4 As shown, the stop structure 18 includes a mounting bracket 20, a pushing device 21, and a stop block 22. The upper surface of the mounting bracket 20 is an arc-shaped stop surface 23 adapted to the outer ring 8. A gap is provided between the stop surface 23 and the outer circumferential surface of the outer ring 8. An arc-shaped buffer groove 24 is formed on the stop surface 23. The pushing device 21 is slidably installed in the buffer groove 24. The stop block 22 is fixedly connected to the pushing end of the pushing device 21. The pushing device 21 can move the stop block 22 in a direction close to the center of the outer ring 8, so that the stop block 22 is inserted into the stop groove 19 on the outer ring 8 and engages with the stop groove 19. Limiting fit; when the stop block 22 is inserted into the stop groove 19, the bottom surface of the pushing device 21 abuts against the bottom of the buffer groove 24, and under the impact of the rotating frame 2, the pushing device 21 slides in the buffer groove 24. Therefore, the impact generated by the rotating frame 2 can be offset by the friction between the pushing device 21 and the buffer groove 24. Correspondingly, a lighter interference fit can be selected between the pushing device 21 and the buffer groove 24. That is, in the initial state, the pushing device 21 is stuck in the buffer groove 24, but when subjected to a sufficiently large external impact, the pushing device 21 can slide in the buffer groove 24.

[0029] The mounting frame 20 can be a large support structure built from the ground using a truss and relatively independent of the wind power generation device described in this solution, or it can be a simple support structure integrally connected to the tower column 4. The choice of the structure of the mounting frame 20 mainly depends on the size and weight of the rotating frame 2 and each of the sub-wheels 3. If the size and weight of the rotating frame 2 and each of the sub-wheels 3 are large, the impact force required to stop the rotating frame 2 from rotating will be greater. Therefore, a mounting frame 20 built using a truss structure is required. In this way, the impact force generated when the stop block 22 is inserted into the stop groove 19 on the outer ring 8 will act on the mounting frame 20, which is independent of the wind power generation device described in this solution, preventing the tower column 4 from breaking due to the inability to withstand the impact. Conversely, if the size and weight of the rotating frame 2 and each of the sub-wheels 3 are small, the external impact required to stop the rotating frame 2 from rotating will be smaller. Therefore, a mounting frame 20 integrally connected to the tower column 4 can be selected, which can save installation costs and installation space. The attached drawings of the specification shown in this solution show a mounting frame 20 built using a truss structure.

[0030] like Figure 5 As shown, the stop structure 18 also includes a buffer device 25, which is a compression spring. At least one buffer device 25 is disposed between any side of the push device 21 and one wall of the buffer groove 24. Specifically, it can be arranged according to the rotational momentum of the rotating frame 2 to provide unidirectional or bidirectional buffer protection. When the push device 21 drives the stop block 22 to engage with the stop groove 19, the buffer device 25 can buffer the impact force transmitted by the rotating frame 2. By absorbing the inertial impact at the moment of braking, the buffer device 25 reduces the rigid collision between components, extends the service life of the stop structure 18, and reduces equipment vibration. In this solution, there are two buffer devices 25, which are disposed on both sides of the push device 21.

[0031] like Figure 5As shown, the pushing device 21 includes an electromagnet 26, a pushing spring 27, a pushing column 28, and a housing 29. The outer surface of the bottom of the housing 29 is an arc-shaped surface that mates with the buffer groove 24. The electromagnet 26 is fixedly installed on the bottom surface inside the housing 29. A guide sleeve 30 is provided at the end of the pushing column 28 away from the electromagnet 26, corresponding to the electromagnet 26. The pushing column 28 is slidably fitted in the guide sleeve 30. The pushing spring 27 is disposed around the electromagnet 26, and one end of the pushing spring 27 is fixedly connected to the bottom surface inside the housing. One end is connected to the end face of the push column 28 near the electromagnet 26, and the push spring 27 always exerts a force on the push column 28 pointing towards the center of the outer ring 8. The stop block 22 is fixedly connected to the end face of the push column 28 away from the electromagnet 26. When the electromagnet 26 is energized, it can drive the push column 28 to move away from the center of the outer ring 8 through attraction and compress the push spring 27. When the electromagnet 26 is de-energized, the push spring 27 resets and pushes the push column 28 to drive the stop block 22 to move towards the center of the outer ring 8.

[0032] A one-way transmission structure 31 is provided between the first gear 11 and the shaft 6 of the main wheel 1. The one-way transmission structure 31 only allows the shaft 6 of the main wheel 1 to transmit force to the first gear 11, and prevents the force from being transmitted from the first gear 11 to the shaft 6. The one-way transmission structure 31 also allows a speed difference between the main wheel 1 and the shaft 6. The one-way transmission structure can be a one-way overrunning clutch or other related structure that can not only realize the one-way transmission of force, but also allow for a speed difference. When the pushing device 21 drives the stop block 22 to engage with the stop groove 19, the first gear 11, the second gear 12, the third gear 13, the connecting shaft 14, and the toothed belt 15 are all stationary, while the shaft 6 of the main wheel 1 can still rotate normally. It should be emphasized that the speed difference here does not mean that the one-way transmission structure 31 cannot transmit all the driving force on the shaft 6 to the first gear 11, but rather that the speed difference between the shaft 6 and the first gear 11 is caused by the obstruction of the first gear 11 by an external force.

[0033] In addition, a backup one-way transmission structure can also be set between the first gear 12 and the connecting shaft 14. The backup one-way transmission structure used here needs to be different from the one-way transmission structure 31 mentioned above. For example, if the one-way transmission structure given in this solution is a one-way overrunning clutch, then the backup one-way transmission structure can be a one-way ratchet mechanism or other structures that meet the requirements. The backup one-way transmission structure only allows the second gear 12 to transmit force to the connecting shaft 14 and prevents the force from being transmitted from the connecting shaft 14 to the second gear 12. The backup one-way transmission structure also allows a speed difference between the second gear 12 and the connecting shaft 14. If set up in this way, when the pushing device 21 drives the stop block 22 to engage with the stop groove 19, only the third gear 13 and the connecting shaft 14 are stationary, while the shaft 6 of the main wheel 1, the first gear 11, the second gear 12 and the toothed belt 15 can all move normally. The one-way transmission structure 31 and the backup one-way transmission structure can cooperate with each other. If either one of them is damaged, the other can still correctly transmit the driving force.

[0034] In addition, a reduction groove can be formed on the outer circumference of the outer ring 8, and a one-way transmission structure 31 can be set between the first gear 12 and the connecting shaft 14. A plurality of stop grooves 19 are formed in a circumferential array on the bottom of the reduction groove. The end face of the stop block 22 away from the pushing device 21 is an arc-shaped surface adapted to the reduction groove, and a friction plate is attached to the arc-shaped surface. In the assembled state, the end of the stop block 22 away from the pushing device 21 extends into the reduction groove. When the magnetism of the electromagnet 26 decreases, the pushing spring 27 can make the stop block 22... 2. The end face away from the pushing device 21 abuts against the bottom of the deceleration groove, thereby reducing the rotation speed of the rotating frame 2 through the friction between the stop block 22 and the deceleration groove. Due to the action of the one-way transmission structure 31, when the rotation speed of the rotating frame 2 decreases, it will not affect the rotation state of the rotating shaft 6 in the main wheel 1. That is to say, although the rotating frame 2 is driven by the rotating shaft 6 in the main wheel 1, when it is necessary to reduce the rotation speed, the rotating frame 2 relies on the friction between the deceleration groove and the stop block 22, while the rotating shaft 6 in the main wheel 1 relies on the deceleration structure set in the main wheel 1 body.

[0035] Since the position of the stop groove 19 on the outer ring 8 is fixed, the arc length between two adjacent stop grooves 19 can be obtained. Furthermore, the rotation speed of the rotating frame 2 can be detected by the sensor, so the time it takes for adjacent stop grooves 19 to rotate to the position of the stop block 22 can be obtained. Based on this time, the attraction force of the electromagnet 26 can be controlled to intermittently increase or decrease, thereby preventing the stop block 22 from being inserted into the stop groove 19 under the action of the push spring 27 when the stop block 22 is in frictional engagement with the deceleration groove.

[0036] In the first embodiment, the radius of the main wheel 1 is equal to the radius of the sub-wheel 3, and the number of blades is the same as the aerodynamic parameters. Therefore, the cut-in wind speed threshold of the main wheel 1 and each sub-wheel 3 is exactly the same. When the ambient wind speed reaches the cut-in threshold, the main wheel 1 and each sub-wheel 3 will be driven by the wind to rotate and generate electricity at the same time. When the main wheel 1 rotates, its shaft 6 drives the first gear 11 to rotate through the one-way transmission structure 31. The first gear 11 drives the second gear 12 to rotate through the toothed belt 15. The connecting shaft 14 and the third gear 13 rotate synchronously with the second gear 12. The third gear 13 meshes with the meshing teeth 17 provided on the inner ring 7 of the rotating frame 2, thereby driving the rotating frame 2 to rotate at a constant speed around the axis of the main wheel 1. Several sub-rotors 3, arranged in a circular array on the rotating frame 2, rotate synchronously with the rotating frame 2, thereby passing through different height positions such as the top, sides, and bottom of the entire wind power generation device in sequence, so that the height of each sub-rotor 3 changes periodically. Those skilled in the art should know that in near-ground space, the higher the altitude, the greater the wind speed, and the greater the wind load that needs to be borne. Therefore, the periodic change in the height of each sub-rotor 3 can enable each sub-rotor 3 to alternately bear the different wind loads caused by different heights, avoid the wear differences caused by the fixed position of each sub-rotor 3, and thus achieve uniform aging of each sub-rotor 3.

[0037] Furthermore, during rotation, if the rotation speed of the rotating frame 2 becomes too high due to factors such as gusts of wind, the pushing device 21 of the stop structure 18 will drive the stop block 22 to insert into the stop groove 19 of the outer ring 7, thereby stopping the rotation of the rotating frame 2 or reducing the rotation speed of the rotating frame 2. When the rotating frame 2 stops rotating, the first gear 11, the second gear 12, the third gear 13, the connecting shaft 14, and the toothed belt 15 are all in a stationary state. However, the one-way transmission structure 31 can prevent the static torque from being transmitted in reverse from the first gear 11 to the rotating shaft 6 of the main wheel 1. Therefore, the rotating shaft 6 of the main wheel 1 can still rotate normally to generate electricity, which can greatly improve the overall power generation efficiency. At the same time, the buffer device 25 can absorb the impact force generated during braking. Therefore, the first embodiment is suitable for mid-latitude regions or basin areas with relatively stable wind speeds.

[0038] In the second embodiment, the radius of the main wheel 1 is larger than the radius of each of the sub-wheels 3. Therefore, the cut-in wind speed threshold of each sub-wheel 3 is much lower than that of the main wheel 1. This configuration, in addition to possessing all the characteristics of the first embodiment, also expands the operating wind speed range of the wind power generation device described in this scheme. During the day, as the sun rises and the ground temperature increases, the temperature difference between the ground surface and the near-ground air increases due to the heating of the ground surface, forming convection. This makes it easier for the wind speed during the day to reach or exceed the cut-in wind speed of the main wheel 1, thereby causing the main wheel 1 to rotate. Since the cut-in wind speed of the main wheel 1 is greater than that of the sub-wheels 3, before the main wheel 1 rotates, each of the sub-wheels 3... Rotational power generation has already commenced; at night, due to the loss of solar radiation heating, the ground surface temperature decreases, leading to a decrease in near-surface air temperature, resulting in lower wind speeds at night compared to during the day. When the nighttime wind speed drops below the cut-in wind speed of the main wheel 1 and only reaches the cut-in wind speed threshold of the sub-wheel 3, each sub-wheel 3 can still rotate to generate electricity. Furthermore, since the air layer tends to be stable at night, there will be no sudden convective changes, meaning the wind speed acting on each sub-wheel 3 tends to be consistent. Therefore, even if the rotating frame 2 does not rotate, the wind load on each sub-wheel 3 tends to be consistent. Thus, the second embodiment is suitable for plateau and coastal areas, especially coastal areas with mountain peaks.

[0039] The above are the preferred embodiments described in this invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention.

Claims

1. A multi-axis wind power generation device with cyclically adjustable rotor height, characterized in that: The system includes a main wheel (1), a rotating frame (2), and several sub-wheels (3). The main wheel (1) is installed at the top of the tower column (4). The rotating frame (2) is coaxial with the main wheel (1) and spaced apart from the main wheel (1) in the axial direction. A transmission device (5) is provided on the main wheel (1). The shaft (6) of the main wheel (1) can drive the rotating frame (2) to rotate around its own axis through the transmission device (5). Several sub-wheels (3) are installed in a circular array on the side of the rotating frame (2) close to the main wheel (1). When the shaft (6) of the main wheel (1) drives the rotating frame (2) to rotate through the transmission device (5), the height position of each sub-wheel (3) can be changed. The rotating frame (2) includes an inner ring (7) and an outer ring (8). The inner ring (7) and the outer ring (8) are connected by a connecting structure (9), and the inner ring (7) and the outer ring (8) form a sub-wheel mounting space (10). The bodies of a number of sub-wheels (3) are arranged in a circular array in the sub-wheel mounting space (10) and are fixedly clamped between the inner ring (7) and the outer ring (8).

2. The multi-axis wind power generation device with cyclically adjustable rotor height according to claim 1, characterized in that: The transmission device (5) includes a first gear (11), a second gear (12), a third gear (13), a connecting shaft (14), a toothed belt (15), and a support frame (16). The first gear (11) is coaxially mounted on the rotating shaft (6) of the main wheel (1). The support frame (16) is fixedly mounted on the upper surface of the outer shell of the main wheel (1). The connecting shaft (14) is rotatably mounted on the upper end of the support frame (16). The second gear (12) and the third gear (13) are coaxially mounted on the connecting shaft (14), and the second gear (12) and the third gear (13) are spaced apart along the axis of the connecting shaft (14). The third gear (13) is connected to the inner ring (7) in a transmission connection. In the assembled state, the second gear (12) is directly above the first gear (11), and the first gear (11) is connected to the second gear (12) in a transmission connection through the toothed belt (15).

3. A multi-axis wind power generation device with cyclically adjustable rotor height according to claim 2, characterized in that: The inner circumference of the inner ring (7) is provided with meshing teeth (17) that can engage with the third gear (13). The meshing transmission between the third gear (13) and the meshing teeth (17) can drive the rotating frame (2) to rotate.

4. A multi-axis wind power generation device with cyclically adjustable rotor height according to claim 3, characterized in that: It also includes a stop structure (18), which is installed directly below the rotating frame (2). The outer circumferential surface of the outer ring (8) is provided with a plurality of stop grooves (19) in a circular array corresponding to the stop structure (18). The limiting cooperation between the stop structure (18) and the stop grooves (19) can stop the rotating frame (2) from rotating.

5. A multi-axis wind power generation device with cyclically adjustable rotor height according to claim 4, characterized in that: The stop structure (18) includes a mounting bracket (20), a pushing device (21), and a stop block (22). The upper surface of the mounting bracket (20) is an arc-shaped stop surface (23) adapted to the outer ring (8). An arc-shaped buffer groove (24) is provided on the stop surface (23). The pushing device (21) is slidably installed in the buffer groove (24). The stop block (22) is fixedly connected to the pushing end of the pushing device (21). The pushing device (21) can make the stop block (22) move in a direction close to the center of the outer ring (8), so that the stop block (22) is inserted into the stop groove (19) on the outer ring (8) and is limited to the stop groove (19).

6. A multi-axis wind power generation device with cyclically adjustable rotor height according to claim 4, characterized in that: The stop structure (18) also includes a buffer device (25), at least one buffer device (25) is disposed between any side of the push device (21) and a wall of the buffer groove (24); when the push device (21) drives the stop block (22) to engage with the stop groove (19), the buffer device (25) can buffer the impact force transmitted by the rotating frame (2).

7. A multi-axis wind power generation device with cyclically adjustable rotor height according to claim 6, characterized in that: The pushing device (21) includes an electromagnet (26), a pushing spring (27), a pushing column (28), and a housing (29). The electromagnet (26) is fixedly installed on the bottom surface inside the housing (29). A guide sleeve (30) is provided at one end of the pushing column (28) away from the electromagnet (26), and the pushing column (28) is slidably fitted in the guide sleeve (30). The pushing spring (27) is arranged around the electromagnet (26), and one end of the pushing spring (27) is fixedly connected to the bottom surface inside the housing, while the other end is connected to the pushing column (28) near the electromagnet. On one end face of the iron (26), and the pushing spring (27) always exerts a force on the pushing column (28) pointing towards the center of the outer ring (8), the stop block (22) is fixedly connected to the end face of the pushing column (28) away from the electromagnet (26); when the electromagnet (26) is energized, it can drive the pushing column (28) to move away from the center of the outer ring (8) through the attraction effect, and compress the pushing spring (27); when the electromagnet (26) is de-energized, the pushing spring (27) resets and pushes the pushing column (28) to drive the stop block (22) to move closer to the center of the outer ring (8).

8. A multi-axis wind power generation device with cyclically adjustable rotor height according to claim 7, characterized in that: A one-way transmission structure (31) is provided between the first gear (11) and the shaft (6) of the main wheel (1). The one-way transmission structure (31) only allows the shaft (6) of the main wheel (1) to transmit force to the first gear (11) and prevents the force from being transmitted from the first gear (11) to the shaft (6). When the pushing device (21) drives the stop block (22) to engage with the stop groove (19), the first gear (11), the second gear (12), the third gear (13), the connecting shaft (14) and the toothed belt (15) are all in a stationary state, while the shaft (6) of the main wheel (1) can still rotate normally.

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