A two-stage wind power generator device

Abstract

The application discloses a two-stage wind power generator device, which adopts two-stage impeller structure, continuous speed regulation, flexible steering switching and vibration suppression technical means to improve the utilization efficiency of wind energy, expand the applicable wind speed range, and enhance the stability and vibration suppression capacity of the system. The device comprises a first-stage impeller, a wind speed and direction measuring device, a second-stage impeller, a variable pitch device, a first guide cover, a cabin main body, a second guide cover, a yaw device and a tower; further, the cabin main body contains a first-stage impeller rotor, a speed increasing box, a first coupling, a continuous speed regulation box, a second coupling, a generator, a third coupling, a forward-reverse inverter, a fourth coupling, a parallel shaft gear box and a second-stage impeller rotor. The application is suitable for the field of wind power generation and provides a solution for more efficient, reliable and continuous wind energy conversion.

Description

A two-stage wind turbine generator Technical Field

[0001] This invention belongs to the field of wind power generation technology, and particularly relates to a two-stage wind turbine generator device. Background Technology

[0002] With global focus on climate change, environmental protection, and energy security, the clean energy transition has become a crucial direction for global development. Against this backdrop, wind turbines, as a renewable and pollution-free energy source, are widely used and promoted. The application of wind turbines contributes to the sustainability and diversification of energy supply, helps reduce dependence on traditional fossil fuels, reduces greenhouse gas emissions, and contributes to addressing climate change. They are widely deployed in urban, rural, and island regions, providing reliable power supply and promoting energy independence and security.

[0003] Currently, most mainstream wind turbine generators are single-rotor type, which mainly have the following problems and limitations:

[0004] 1. Dependence on weather conditions: The power generation capacity of a single-rotor wind turbine is limited by wind speed and direction. When wind speed is insufficient or fluctuates significantly, the power generation efficiency of the wind turbine is low. This forces wind turbines to stop operating in certain regions or seasons, making it impossible to generate sufficient electricity reliably.

[0005] 2. Large land area and environmental impact: Existing wind turbines require a large land area, which may be a limitation in cities or densely populated areas. They also generate continuous noise and disturb wildlife during operation.

[0006] 3. Reliability issues: Due to the instability of wind speed and direction, the output power of a single-rotor wind turbine fluctuates, which poses a challenge to the stability and reliability of the power grid.

[0007] 4. High cost and maintenance requirements: To increase the power of wind turbines, existing technologies often use increased blade length to improve swept area and efficiency. Therefore, the construction and installation costs of wind towers and power generation systems also increase accordingly. In addition, the mechanical components of single-rotor wind turbines are susceptible to vibration and flutter, requiring regular maintenance and repair. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides a two-stage wind turbine generator. By employing techniques such as a two-stage impeller structure, continuous speed regulation, flexible steering switching, and vibration suppression, this device can effectively improve wind energy utilization efficiency, expand the applicable wind speed range, and enhance system stability and vibration suppression capabilities. It can be widely applied in the field of wind power generation, providing a new solution for more efficient, reliable, and sustainable wind energy conversion.

[0009] To achieve the above objectives, the present invention employs the following technical solution:

[0010] A two-stage wind turbine generator includes a first-stage rotor, a wind speed and direction measuring device, a second-stage rotor, a pitch control device, a first fairing, a nacelle body, a second fairing, a yaw device, and a tower. The first and second fairings are located at opposite ends of the nacelle body, and the bottom of the nacelle body is mounted on the tower via the yaw device. The wind speed and direction measuring device is mounted on the nacelle body and is used to measure and acquire real-time wind speed and direction information. The first-stage rotor is located at the windward end for wind energy capture, and the second-stage rotor is located at the leeward end for wind energy capture. The first-stage rotor is positioned circumferentially on the first fairing via the pitch control device, and the second-stage rotor is positioned circumferentially on the second fairing via the pitch control device.

[0011] The main body of the nacelle is used to realize the functions of power transmission between the first-stage and second-stage impellers, speed ratio adjustment, rotation direction adjustment, and energy conversion.

[0012] A further improvement of the present invention is that both the first-stage impeller and the second-stage impeller have three blades, and the blade length of the first-stage impeller is greater than that of the blade length of the second-stage impeller.

[0013] A further improvement of the present invention is that the interior of the main body of the nacelle includes a first-stage impeller rotor, a speed increaser, a first coupling, a continuous gearbox, a second coupling, a generator, a third coupling, a forward and reverse commutator, a fourth coupling, a parallel shaft gearbox, and a second-stage impeller rotor.

[0014] The first-stage impeller rotor is connected to the first-stage impeller and transmits the input rotational power of the first-stage impeller to the speed increaser. The speed increaser is connected to the first-stage impeller rotor and the first coupling and converts the low-speed, high-torque input into a high-speed, low-torque output, increasing the rotational speed and transmitting the output to the continuous gearbox via the first coupling. The output end of the continuous gearbox is connected to the second coupling and the third coupling. The second coupling is connected to the generator and transmits the output of the continuous gearbox to the generator, converting mechanical energy into electrical energy, which is then output to the power transmission system. The third coupling is connected to the subsequent forward and reverse commutator and transmits power to the second-stage impeller via the parallel shaft gearbox. The continuous gearbox can adjust the speed ratio between the first-stage impeller and the second-stage impeller according to changes in wind speed. The fourth coupling connects the forward and reverse commutator and the parallel shaft gearbox and transmits the output of the forward and reverse commutator to the parallel shaft gearbox. The parallel shaft gearbox is connected to the second-stage impeller rotor and transmits power through parallel shaft gear transmission to ensure that the second-stage impeller rotor and the first-stage impeller rotor are coaxial.

[0015] A further improvement of the present invention is that the continuous gearbox includes a power input shaft, a first support bearing, a first fixed cone wheel, a main shaft movable cone wheel, a second support bearing, a first output shaft, a first hydraulic oil line, a first hydraulic oil chamber, a trapezoidal thrust band, a second hydraulic oil line, a countershaft end, a third support bearing, a second hydraulic oil chamber, a countershaft movable cone wheel, a second fixed cone wheel, a fourth support bearing, and a second output shaft;

[0016] The continuous gearbox transmits power by connecting two parts via a trapezoidal thrust belt. The first part consists of a power input shaft, a first support bearing, a first fixed conical wheel, a main shaft movable conical wheel, a second support bearing, and a first output shaft. The power input shaft of the first part is connected to a first coupling to transmit power input from the first-stage impeller, and the first output shaft is connected to a second coupling to transmit mechanical energy to the generator for electrical energy conversion. The second part consists of a secondary shaft end, a third support bearing, a secondary shaft movable conical wheel, a second fixed conical wheel, a fourth support bearing, and a second output shaft. The second output shaft is connected to a third coupling to control the rotational speed of the second-stage impeller and adjust the load mode.

[0017] One end of the trapezoidal thrust band is clamped by a first fixed conical wheel and a movable conical wheel of the main shaft, and the other end is clamped by a movable conical wheel of the secondary shaft and a second fixed conical wheel. The movable conical wheel of the main shaft and the movable conical wheel of the secondary shaft are controlled by hydraulic thrust to slide axially, allowing them to tighten or loosen. The space between the first output shaft and the movable conical wheel of the main shaft forms a first hydraulic oil chamber. A first hydraulic oil pipeline passes through the first output shaft, and the flow rate through the first hydraulic oil pipeline controls the pressure of the hydraulic oil in the first hydraulic oil chamber, thereby adjusting the position of the movable conical wheel of the main shaft. One end of the secondary shaft is suspended and supported and fixed by a third support bearing, while the space between the other end and the movable conical wheel of the secondary shaft forms a second hydraulic oil chamber. The chamber has a second hydraulic oil line that runs from the suspended side through the sub-shaft end. The flow rate of the second hydraulic oil line controls the pressure of the hydraulic oil in the second hydraulic oil chamber, thereby adjusting the position of the movable conical wheel of the sub-shaft. The movable conical wheels of the main shaft and the sub-shaft adjust the rotation radius on both sides by compressing the trapezoidal thrust belt, thereby changing the transmission ratio. By hydraulically adjusting the positions of the movable conical wheels of the main shaft and the sub-shaft, the rotation radius of the trapezoidal thrust belt at both ends is changed. The continuous gearbox can achieve stepless adjustment of speed and transmission ratio. The continuous gearbox can adjust the transmission ratio in real time according to the signal changes measured by the wind speed and direction measuring device and the load demand of the generator to achieve the highest efficiency energy conversion.

[0018] A further improvement of the present invention is that when the movable conical wheel of the main shaft moves inward and tightens, the trapezoidal thrust belt moves outward from the center under the compression of the conical disc, thereby increasing the transmission diameter and the transmission ratio.

[0019] A further improvement of the present invention is that when the movable cone wheel of the main shaft moves outward to open, the trapezoidal thrust belt moves inward to the center, the transmission diameter decreases, and the transmission ratio decreases.

[0020] A further improvement of the present invention is that the forward and reverse commutator includes a commutator input shaft, a first commutator support bearing, a commutator housing, a commutator output shaft, a second commutator support bearing, a forward clutch, a reverse clutch, a commutator sun gear, a first commutator planetary gear, a second commutator planetary gear, a planetary gear shaft, and an internal gear.

[0021] The commutator input shaft is connected to the previous stage transmission system via a third coupling, i.e., the power of the continuous gearbox is transmitted to the forward and reverse commutators via the second output shaft; the first and second commutator support bearings are used to fix and support the commutator input shaft and the commutator output shaft; the commutator housing provides external structural support and protection for the forward and reverse commutators, and the commutator housing is connected to the internal gear via a reverse clutch; the commutator input shaft is directly connected to the commutator sun gear, and the commutator input shaft is connected to the internal gear ring via a forward clutch; the commutator output shaft is the commutator planetary gear disk, the planetary gear shaft is fixed on the front end face of the commutator output shaft, the first and second commutator planetary gears mesh and rotate around the planetary gear shaft, and the rear end face of the commutator output shaft is connected to the parallel shaft gearbox of the next stage transmission mechanism via a fourth coupling; the forward and reverse commutator can achieve forward and reverse rotation by controlling the engagement and disengagement states of the forward and reverse clutches.

[0022] A further improvement of the present invention is that when the reversing clutch is engaged, the internal gear is fixed to the commutator housing and cannot rotate; when the reversing clutch is disengaged, the internal gear is disengaged from the commutator housing and can rotate freely.

[0023] A further improvement of the present invention is that when the forward clutch is engaged, the internal gear is fixedly connected to the commutator input shaft and the commutator sun gear, maintaining rotation in the same direction and at the same speed. When the forward clutch is disengaged, the internal gear disengages and can rotate freely.

[0024] A further improvement of this invention is that when the forward clutch is engaged and the reverse clutch is disengaged, the commutator sun gear and the internal gear are fixed together, and the first and second commutator planetary gears cannot rotate freely. Power is directly transmitted from the commutator input shaft to the commutator output shaft, achieving forward and same-speed rotation. Conversely, when the forward clutch is disengaged and the reverse clutch is engaged, the internal gear is fixed to the commutator housing and cannot rotate. Power is transmitted through the commutator input shaft to the commutator sun gear, which meshes with the first commutator planetary gear. The first commutator planetary gear rotates in the opposite direction to the input. Through power transmission, the second commutator planetary gear rotates in the same direction as the input. However, because the internal gear is fixed to the commutator housing and cannot rotate, the second… The power of the commutator planetary gears is transmitted to the planetary gear shaft, which drives the commutator output shaft to rotate. The rotation direction of the commutator output shaft is opposite to that of the second commutator planetary gear, thus achieving reverse rotation of the commutator output shaft and the commutator input shaft. The forward and reverse clutches are electronically controlled mechanical or hydraulic devices. The specific states of the two clutches can flexibly switch directions based on the signals measured by the wind speed and direction measuring device and the load requirements of the generator. At low wind speeds, the first-stage impeller and the second-stage impeller rotate in the same direction, and the power output of both stages is simultaneously transmitted to the generator to achieve the highest efficiency energy conversion. At low wind speeds, the first-stage impeller and the second-stage impeller rotate in opposite directions, with the second-stage impeller acting as a load to reduce the speed of the first-stage impeller.

[0025] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0026] 1. Improved Wind Energy Utilization: This invention employs a two-stage wind turbine design, which enhances energy capture efficiency at lower wind speeds. Traditional wind turbines are less efficient at low wind speeds, while this invention, through an optimized dual-blade design and co-rotation technology solution, enables the wind turbine to more effectively utilize low-speed wind energy, thereby improving power generation efficiency.

[0027] 2. Expanded Applicable Wind Speed ​​Range: The two-stage wind turbine of this invention can avoid stalling under high wind speeds. Traditional wind turbines are prone to stalling under high wind speeds, limiting their applicability. This invention, through a commutator control mechanism, can flexibly switch the rotation direction of the two-stage impellers when needed to adapt to different meteorological conditions and optimize energy output. This allows the wind turbine to operate stably over a wider wind speed range, improving the generator's reliability and adaptability.

[0028] 3. Continuous Speed ​​Regulation: The two-stage wind turbine generator of this invention can adjust the transmission ratio in real time according to changes in wind speed and the load requirements of the generator to achieve the highest energy conversion efficiency. The continuous gearbox adjusts the positions of the movable conical pulleys on the main shaft and the auxiliary shaft hydraulically, changing the rotation radius of the trapezoidal thrust belt at both ends, thus achieving stepless adjustment of the speed and transmission ratio. This allows the wind turbine generator to maintain stability and high performance across the entire speed range.

[0029] 4. Improved system stability and vibration suppression: The two-stage wind turbine generator of the present invention ensures that the rotor of the second stage impeller is coaxial with the rotor of the first stage impeller, reducing the overall nacelle vibration caused by shaft misalignment, and can effectively offset torque, ensuring the stability of the entire device in the high wind speed range.

[0030] 5. Reduced construction and maintenance costs: The two-stage wind turbine design in this invention offers high stability and reliability, allowing for a reduction in tower height. This avoids the high costs associated with wind turbine supports and towers, while also reducing equipment maintenance requirements and operating costs. Therefore, this invention is more economically feasible and competitive.

[0031] In summary, the two-stage wind turbine generator provided by this invention, through the use of a two-stage impeller structure, continuous speed regulation, flexible steering switching, and vibration suppression, can effectively improve the utilization efficiency of wind energy, expand the applicable wind speed range, and enhance the system's stability and vibration suppression capabilities. It can be widely applied in the field of wind power generation, providing a new solution for more efficient, reliable, and sustainable wind energy conversion. Attached Figure Description

[0032] Figure 1 is a schematic diagram of a two-stage wind turbine generator device according to the present invention;

[0033] Figure 2 is a schematic diagram of the internal structure of the main body of the cabin of the present invention;

[0034] Figure 3 is a schematic diagram of the continuous gearbox of the present invention;

[0035] Figure 4 is a schematic diagram of the forward and reverse commutator of the present invention, wherein Figure 4(a) is the front view, Figure 4(b) is the AA-direction sectional view of Figure 4(a), and Figure 4(c) is the BB-direction sectional view of Figure 4(a).

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. First-stage impeller; 2. Wind speed and direction measuring device; 3. Second-stage impeller; 4. Pitch control device; 5. First fairing; 6. Nacelle main body; 7. Second fairing; 8. Yaw device; 9. Tower; 10. First-stage impeller rotor; 11. Speed ​​increaser; 12. First coupling; 13. Continuous gearbox; 14. Second coupling; 15. Generator; 16. Third coupling; 17. Reverse commutator; 18. Fourth coupling; 19. Parallel shaft gearbox; 20. Second-stage impeller rotor; 21. Power input shaft; 22. First support bearing; 23. First fixed conical wheel; 24. Main shaft movable conical wheel; 25. Second support bearing; 26. First output shaft; 27. 28. First hydraulic oil line; 29. ​​First hydraulic oil chamber; 30. Trapezoidal thrust band; 31. Second hydraulic oil line; 32. Secondary shaft end; 33. Third support bearing; 34. Secondary hydraulic oil chamber; 35. Secondary shaft movable cone wheel; 36. Secondary fixed cone wheel; 37. Fourth support bearing; 38. Second output shaft; 39. Commutator input shaft; 40. First commutator support bearing; 41. Commutator housing; 42. Commutator output shaft; 43. Second commutator support bearing; 44. Forward clutch; 45. Reverse clutch; 46. Commutator sun gear; 47. First commutator planetary gear; 48. Second commutator planetary gear; 49. Planetary gear shaft; 40. Internal gear. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments:

[0039] Please refer to Figure 1, which is a schematic diagram of a two-stage wind turbine generator provided by the present invention, including a first-stage impeller 1, a wind speed and direction measuring device 2, a second-stage impeller 3, a pitch control device 4, a first fairing 5, a nacelle body 6, a second fairing 7, a yaw device 8, and a tower 9.

[0040] Please refer to Figure 2, which is a schematic diagram of the internal structure of the nacelle body 6 of a two-stage wind turbine generator provided by the present invention. The nacelle body 6 includes a first-stage impeller rotor 10, a speed increaser 11, a first coupling 12, a continuous gearbox 13, a second coupling 14, a generator 15, a third coupling 16, a forward and reverse commutator 17, a fourth coupling 18, a parallel shaft gearbox 19, and a second-stage impeller rotor 20.

[0041] Please refer to Figure 3, which is a structural schematic diagram of a continuous gearbox 13 for a two-stage wind turbine generator provided by the present invention. The continuous gearbox 13 is composed of a series of parts, including a power input shaft 21, a first support bearing 22, a first fixed conical wheel 23, a main shaft movable conical wheel 24, a second support bearing 25, a first output shaft 26, a first hydraulic oil line 27, a first hydraulic oil chamber 28, a trapezoidal thrust band 29, a second hydraulic oil line 30, a secondary shaft end 31, a third support bearing 32, a second hydraulic oil chamber 33, a secondary shaft movable conical wheel 34, a second fixed conical wheel 35, a fourth support bearing 36, and a second output shaft 37.

[0042] Please refer to Figure 4, which is a structural schematic diagram of the forward and reverse commutator 17 of a two-stage wind turbine generator provided by the present invention. The forward and reverse commutator 17 is composed of a series of parts, including a commutator input shaft 38, a first commutator support bearing 39, a commutator housing 40, a commutator output shaft 41, a second commutator support bearing 42, a forward clutch 43, a reverse clutch 44, a commutator sun gear 45, a first commutator planetary gear 46, a second commutator planetary gear 47, a planetary gear shaft 48, and an internal gear 49.

[0043] Preferably, the two-stage wind turbine generator provided by the present invention is a horizontal axis wind turbine generator, consisting of two stages of impellers, each with three blades. The first stage impeller 1 is located at the windward end for wind energy capture, and the second stage impeller 3 is located at the leeward end for wind energy capture. The blade length of the first stage impeller 1 can be greater than the blade length of the second stage impeller 3. The wind speed and direction measuring device 2 is used to measure and acquire real-time wind speed and direction information. The yaw device 8 changes the overall windward direction of the wind turbine generator based on the wind direction information to ensure that the first stage impeller 1 is always located on the windward side. The pitch control device 4 is located on the first stage impeller 1 and the second stage impeller 3 respectively, and can independently control the two impellers. The blade angle of the first-stage impeller is adjusted to maintain a suitable angle with the wind direction to improve wind energy utilization. The pitch control device 4 can automatically adjust the blade angle based on the data from the wind speed and direction measuring device 2. The first and second guide vanes 5 and 7 are located at the windward and leeward ends, respectively, and are used to guide the airflow through the profile surface, which has the functions of noise reduction and improved stability. The nacelle body 6 is the core component of the two-stage wind turbine generator proposed in this invention. It is located between the first and second guide vanes 5 and 7, and is supported by the tower 9 at the bottom. The nacelle body 6 has the functions of power transmission, speed ratio adjustment, and rotation direction adjustment of the first-stage impeller 1 and the second-stage impeller 3, as well as energy conversion.

[0044] Preferably, the nacelle body 6 of the two-stage wind turbine generator provided by the present invention includes several important components: the first-stage impeller rotor 10 is connected to the first-stage impeller 1 and is used to transmit the input rotational power of the first-stage impeller 1 to the speed increaser 11; the speed increaser 11 is connected to the first-stage impeller rotor 10 and the first coupling 12, converting the low-speed, high-torque input into a high-speed, low-torque output, increasing the rotational speed, and transmitting the output to the continuous gearbox 13 through the first coupling 12; the continuous gearbox 13 is composed of a series of components, with its input end connected to the first coupling 12 and its output ends connected to the second coupling 14 and the third coupling 16 respectively, wherein the second coupling 14 is connected to the generator 15, transmitting the output of the continuous gearbox 13 to the generator 15, converting mechanical energy into electrical energy, and outputting it to the power transmission system; the third coupling 16 is connected to the subsequent forward and reverse commutator 17, transmitting power to the second stage via the parallel shaft gearbox 19. The impeller 3 and the continuous gearbox 13 can adjust the speed ratio of the first-stage impeller 1 and the second-stage impeller 3 according to changes in wind speed to achieve optimal matching. The forward and reverse commutator 17 is composed of a series of components and is a key component in the wind turbine used to adjust the rotation direction of the second-stage impeller 3. It obtains real-time wind speed and direction information based on the wind speed and direction measuring device 2 and realizes the forward and reverse rotation switching of the second-stage impeller 3 when needed. The fourth coupling 18 connects the forward and reverse commutator 17 and the parallel shaft gearbox 19, and transmits the output of the forward and reverse commutator 17 to the parallel shaft gearbox 19. The parallel shaft gearbox 19 is connected to the second-stage impeller rotor 20 and realizes power transmission through parallel shaft gear transmission. It is used to ensure that the second-stage impeller rotor 20 is coaxial with the first-stage impeller rotor 10, so as to reduce the vibration of the entire nacelle caused by the axial deviation between the second-stage impeller 3 connected to the second-stage impeller rotor 20 and the first-stage impeller rotor 10 when rotating in the same or opposite directions.

[0045] Preferably, the continuous gearbox 13 of the two-stage wind turbine generator provided by the present invention achieves continuous speed adjustment through a series of components: the continuous gearbox 13 connects two parts through a trapezoidal thrust belt 29 to realize power transmission. The first part consists of a power input shaft 21, a first support bearing 22, a first fixed conical wheel 23, a movable conical wheel 24 of the main shaft, a second support bearing 25, and a first output shaft 26. The power input shaft 21 of the first part is connected to a first coupling 12 to transmit power input from the first stage impeller 1, and the first output shaft 26 is connected to a second coupling 14 to transmit mechanical energy to the generator 15 to realize electrical energy conversion. The second part consists of a secondary shaft end 31, a third support bearing 32, and a movable secondary shaft end 36. The system comprises a moving cone wheel 34, a second fixed cone wheel 35, a fourth support bearing 36, and a second output shaft 37. The second output shaft 37 is connected to a third coupling 16 to control the rotational speed and adjust the load mode of the second-stage impeller 3. One end of the trapezoidal thrust band 29 is clamped by the first fixed cone wheel 23 and the main shaft movable cone wheel 24, and the other end is clamped by the auxiliary shaft movable cone wheel 34 and the second fixed cone wheel 35. The main shaft movable cone wheel 24 and the auxiliary shaft movable cone wheel 34 are controlled by hydraulic thrust to slide axially and can be tightened or loosened. The space contained within the first output shaft 26 and the main shaft movable cone wheel 24 is the first hydraulic oil chamber 28. The first hydraulic oil pipeline 27 passes through the first output shaft 26 and carries the first hydraulic oil. The flow rate change of pipeline 27 can control the pressure of hydraulic oil in the first hydraulic oil chamber 28, thereby adjusting the position of the movable cone wheel 24 of the main shaft; one end of the auxiliary shaft end 31 is suspended and supported and fixed by the third support bearing 32, and the space enclosed by the other end and the movable cone wheel 34 of the auxiliary shaft forms the second hydraulic oil chamber 33. The second hydraulic oil pipeline 30 passes through the auxiliary shaft end 31 from the suspended side. The flow rate change of the second hydraulic oil pipeline 30 can control the pressure of hydraulic oil in the second hydraulic oil chamber 33, thereby adjusting the position of the movable cone wheel 34 of the auxiliary shaft; the movable cone wheel 24 of the main shaft and the movable cone wheel 34 adjust the rotation radius on both sides by squeezing the trapezoidal thrust band 29, thereby changing the transmission ratio: when the movable cone wheel of the main shaft... When the main shaft movable cone wheel 24 moves inward to tighten, the trapezoidal thrust belt 29 moves outward under the pressure of the conical disc, increasing the transmission diameter and transmission ratio. When the main shaft movable cone wheel 24 moves outward to open, the trapezoidal thrust belt 29 moves inward, decreasing the transmission diameter and transmission ratio. By hydraulically adjusting the positions of the main shaft movable cone wheel 24 and the secondary shaft movable cone wheel 34, the rotation radius of the trapezoidal thrust belt 29 at both ends can be changed. The continuous gearbox 13 can achieve stepless adjustment of speed and transmission ratio. The continuous gearbox 13 can adjust the transmission ratio in real time according to the signal changes measured by the wind speed and direction measuring device 2 and the load requirements of the generator 15 to achieve the highest efficiency energy conversion and ensure the stability and high performance of the entire device in the full speed range.

[0046] Preferably, the forward and reverse commutator 17 of the two-stage wind turbine generator provided by the present invention flexibly achieves steering switching through a series of components: the commutator input shaft 38 is connected to the transmission system of the previous stage through a third coupling 16, that is, the power of the continuous gearbox 13 is transmitted to the forward and reverse commutator 17 through the second output shaft 37; the first commutator support bearing 39 and the second commutator support bearing 42 are used to fix and support the commutator input shaft 38 and the commutator output shaft 41 to ensure their stable operation; the commutator housing 40 is for forward and reverse switching. The commutator 13 provides external structural support and protection while housing other components. The commutator housing 40 is connected to the internal gear 49 via a reversing clutch 44. When the reversing clutch 44 is engaged, the internal gear 49 is fixed to the commutator housing 40 and cannot rotate. When the reversing clutch 44 is disengaged, the internal gear 49 is disengaged from the commutator housing 40 and can rotate freely. The commutator input shaft 38 is directly connected to the commutator sun gear 45. The commutator input shaft is connected to the internal gear ring 49 via a forward clutch 43. When clutch 43 is engaged, internal gear 49 is fixedly connected to commutator input shaft 38 and commutator sun gear 45, maintaining rotation in the same direction and at the same speed. When forward clutch 43 is disengaged, internal gear 49 disengages and can rotate freely. The commutator output shaft 41 is the commutator planetary gear disk. Planetary gear shaft 48 is fixed to the front end face of commutator output shaft 41. First commutator planetary gear 46 and second commutator planetary gear 47 mesh and rotate around planetary gear shaft 48. The rear end face of commutator output shaft 41 is connected to the fourth coupling 18. The next stage transmission mechanism is connected to the parallel shaft gearbox 19; the forward and reverse commutator 17 can achieve forward and reverse rotation by controlling the engagement and disengagement states of the forward clutch 43 and the reverse clutch 44. The specific control logic is as follows: when the forward clutch 43 is engaged and the reverse clutch 44 is disengaged, the commutator sun gear 45 and the internal gear 49 are fixedly connected, the first commutator planetary gear 46 and the second commutator planetary gear 47 cannot rotate freely, and the power is directly transmitted from the commutator input shaft 38 to the commutator output shaft 41 to achieve forward and same speed rotation;Conversely, when the forward clutch 43 disengages and the reverse clutch 44 engages, the internal gear 49 is fixed to the commutator housing 40 and cannot rotate. Power is transmitted through the commutator input shaft 38 to the commutator sun gear 45. The commutator sun gear 45 meshes with the first commutator planetary gear 46, which rotates in the opposite direction to the input. The first commutator planetary gear 46 and the second commutator planetary gear 47 mesh and transmit power. The second commutator planetary gear 46 rotates in the same direction as the input. Since the internal gear 49 is fixed to the commutator housing 40 and cannot rotate, the power of the second commutator planetary gear 46 is transmitted to the planetary gear shaft 48. The planetary gear shaft 48 drives the commutator output shaft 41 to rotate. The rotation direction of the commutator output shaft 41 is opposite to that of the second commutator planetary gear 46, thus realizing the rotation of the commutator output shaft 41. The first-stage impeller 1 and the second-stage impeller 3 rotate in opposite directions to the commutator input shaft 38. The forward-rotating clutch 43 and the reverse-rotating clutch 44 can be electronically controlled mechanical or hydraulic devices. The specific state of the two clutches can flexibly switch directions based on the signals measured by the wind speed and direction measuring device 2 and the load requirements of the generator 15. At low wind speeds, the first-stage impeller 1 and the second-stage impeller 3 rotate in the same direction, and the power output of both stages is simultaneously transmitted to the generator 15 to achieve the highest efficiency energy conversion. At low wind speeds, the first-stage impeller 1 and the second-stage impeller 3 rotate in opposite directions, with the second-stage impeller 3 acting as a load to reduce the speed of the first-stage impeller 1, which can effectively prevent the wind turbine from stalling. At the same time, the two coaxial impellers rotating in opposite directions can effectively counteract torque and ensure the stability of the entire device in the high wind speed range.

[0047] Preferably, the two-stage wind turbine generator provided by the present invention has the following operating characteristics: Based on the wind direction information measured by the wind speed and direction measuring device 2, the yaw device 4 changes the overall windward direction of the wind turbine generator, ensuring that the first-stage impeller 1 is always located on the windward side; based on the wind speed information measured by the wind speed and direction measuring device 2, when the wind speed is low, the forward and reverse commutator 17 executes the command to engage the forward clutch 43 and disengage the reverse clutch 44, realizing that the first-stage impeller 1 and the second-stage impeller 3 rotate in the same direction. The speed ratio and power transmission characteristics of the two-stage impellers are controlled and adjusted by the continuous gearbox 13 to adapt to different wind speeds and achieve efficient wind energy extraction. The output of both impellers is simultaneously transmitted to the generator 15 to increase power generation efficiency and stability. At this time, the pitch control device 4 adjusts the blade angles of the front and rear impellers to a larger value to increase the swept area and efficiency. Based on the wind speed information measured by the wind speed and direction measuring device 2, when the wind speed is high, the forward and reverse commutator 17 executes the command to disengage the forward clutch 43 and engage the reverse clutch 44, so that the first-stage impeller 1 and the second-stage impeller 3 rotate in opposite directions. The second-stage impeller 3 acts as a load to reduce the speed of the first-stage impeller 1, which can effectively prevent the wind turbine from stalling. The speed ratio and power transmission characteristics of the two-stage impellers are controlled and adjusted by the continuous gearbox 13 to adapt to different wind speeds and achieve efficient wind energy extraction. At the same time, the counter-rotation of the two coaxial impellers can effectively counteract torque and ensure the stability of the entire device in the high wind speed range. At this time, the pitch control device 4 adjusts the blade angles of the front and rear impellers to a smaller value to reduce swept resistance and prevent blade breakage.

[0048] In summary, the two-stage wind turbine generator provided by this invention, through the use of a two-stage impeller structure, continuous speed regulation, flexible steering switching, and vibration suppression, can effectively improve the utilization efficiency of wind energy, expand the applicable wind speed range, and enhance the system's stability and vibration suppression capabilities. It can be widely applied in the field of wind power generation, providing a new solution for more efficient, reliable, and sustainable wind energy conversion.

[0049] Finally, it should be noted that the above embodiments are merely preferred embodiments of the present invention and are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific embodiments of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A two-stage wind turbine generator, characterized in that, It includes a first-stage impeller, a wind speed and direction measuring device, a second-stage impeller, a pitch control device, a first fairing, a nacelle body, a second fairing, a yaw device, and a tower; the first and second fairings are located at opposite ends of the nacelle body, and the bottom of the nacelle body is mounted on the tower via the yaw device; the wind speed and direction measuring device is mounted on the nacelle body and is used to measure and acquire real-time wind speed and direction information; The first-stage impeller is located at the windward end of the wind energy capture system, and the second-stage impeller is located at the leeward end. The first-stage impeller is positioned circumferentially on the first guide vane via a pitch control device, and the second-stage impeller is positioned circumferentially on the second guide vane via a pitch control device. The nacelle body is used to realize the functions of power transmission, speed ratio adjustment, and rotation direction adjustment between the first-stage and second-stage impellers, as well as energy conversion. The interior of the nacelle body includes a first-stage impeller rotor, a speed increaser, a first coupling, a continuous gearbox, a second coupling, a generator, a third coupling, a forward / reverse commutator, a fourth coupling, a parallel shaft gearbox, and the second-stage impeller rotor. The first-stage impeller rotor is connected to the first-stage impeller and is used to transmit the input rotational power of the first-stage impeller to the speed increaser. The gearbox is connected to the first-stage impeller rotor and the first coupling to convert low-speed, high-torque input into high-speed, low-torque output, increasing the rotational speed and transmitting the output to the continuous gearbox via the first coupling. The output of the continuous gearbox is connected to the second and third couplings. The second coupling is connected to the generator to transmit the output of the continuous gearbox to the generator, converting mechanical energy into electrical energy, which is then output to the power transmission system. The third coupling is connected to the subsequent forward and reverse commutator, transmitting power to the second-stage impeller via the parallel shaft gearbox. The continuous gearbox adjusts the speed ratio between the first-stage and second-stage impellers according to changes in wind speed. The fourth coupling connects the forward and reverse commutator and the parallel shaft gearbox, transmitting the output of the forward and reverse commutator to the parallel shaft gearbox. The gearbox; the parallel shaft gearbox connects to the second-stage impeller rotor and transmits power through parallel shaft gear transmission, ensuring that the second-stage impeller rotor is coaxial with the first-stage impeller rotor; the continuous gearbox includes a power input shaft, a first support bearing, a first fixed conical wheel, a main shaft movable conical wheel, a second support bearing, a first output shaft, a first hydraulic oil line, a first hydraulic oil chamber, a trapezoidal thrust band, a second hydraulic oil line, a secondary shaft end, a third support bearing, a second hydraulic oil chamber, a secondary shaft movable conical wheel, a second fixed conical wheel, a fourth support bearing, and a second output shaft; the continuous gearbox transmits power by connecting two parts through a trapezoidal thrust band, the first part consisting of a power input shaft, a first support bearing, a first fixed conical wheel, a main shaft movable conical wheel, a second support bearing, a third support bearing, a second hydraulic oil chamber, a fourth support bearing, and a second output shaft; the continuous gearbox transmits power by connecting two parts through a trapezoidal thrust band, the first part consisting of a power input shaft, a first support bearing, a first fixed conical wheel, a main shaft movable conical wheel, a second support bearing, a third support bearing, a second hydraulic oil chamber, a fourth support bearing, and a second output shaft; The first part consists of a support bearing and a first output shaft. The power input shaft of the first part is connected to the first coupling to transmit power input from the first stage impeller. The first output shaft is connected to the second coupling to transmit mechanical energy to the generator to achieve electrical energy conversion. The second part consists of a secondary shaft end, a third support bearing, a secondary shaft movable cone wheel, a second fixed cone wheel, a fourth support bearing, and a second output shaft. The second output shaft is connected to the third coupling to control the rotation speed of the second stage impeller and adjust the load mode. One end of the trapezoidal thrust belt is clamped by the first fixed cone wheel and the main shaft movable cone wheel, and the other end is clamped by the secondary shaft movable cone wheel and the second fixed cone wheel. The main shaft movable cone wheel and the secondary shaft movable cone wheel are controlled by hydraulic thrust to slide axially and can be tightened or opened.The space encompassed by the first output shaft and the movable conical wheel of the main shaft forms a first hydraulic oil chamber. A first hydraulic oil line passes through the first output shaft, and the flow rate of the first hydraulic oil line controls the pressure of the hydraulic oil in the first hydraulic oil chamber, thereby adjusting the position of the movable conical wheel of the main shaft. One end of the auxiliary shaft is suspended and supported and fixed by a third support bearing. The space encompassed by the other end and the movable conical wheel of the auxiliary shaft forms a second hydraulic oil chamber. A second hydraulic oil line passes through the auxiliary shaft end from the suspended side, and the flow rate of the second hydraulic oil line controls the pressure of the hydraulic oil in the second hydraulic oil chamber, thereby adjusting the position of the movable conical wheel of the auxiliary shaft. The movable conical wheel of the main shaft and the movable conical wheel of the auxiliary shaft adjust the rotation radius on both sides by squeezing the trapezoidal thrust belt, thereby changing the transmission ratio. By hydraulically adjusting the position of the movable conical wheel of the main shaft and the movable conical wheel of the auxiliary shaft, the rotation radius of the trapezoidal thrust belt at both ends is changed. The continuous gearbox can achieve stepless adjustment of speed and transmission ratio. The continuous gearbox can adjust the transmission ratio in real time according to the signal changes measured by the wind speed and direction measuring device and the load requirements of the generator to achieve the highest efficiency energy conversion. ; 2. The two-stage wind turbine generator according to claim 1, characterized in that, Both the first-stage and second-stage impellers have three blades, with the blades of the first-stage impeller being longer than those of the second-stage impeller.

3. The two-stage wind turbine generator according to claim 1, characterized in that, When the movable conical wheel of the main shaft moves inward and tightens, the trapezoidal thrust belt moves outward from the center under the pressure of the conical disc, increasing the transmission diameter and the transmission ratio.

4. A two-stage wind turbine generator according to claim 1, characterized in that, When the movable cone wheel of the main shaft moves outward to open, the trapezoidal thrust belt moves inward to the center, the transmission diameter decreases, and the transmission ratio decreases.

5. A two-stage wind turbine generator according to claim 1, characterized in that, The forward and reverse commutator includes a commutator input shaft, a first commutator support bearing, a commutator housing, a commutator output shaft, a second commutator support bearing, a forward clutch, a reverse clutch, a commutator sun gear, a first commutator planetary gear, a second commutator planetary gear, a planetary gear shaft, and an internal gear. The commutator input shaft is connected to the previous stage transmission system via a third coupling, i.e., the power of the continuous gearbox is transmitted to the forward and reverse commutator via a second output shaft. The first and second commutator support bearings are used to fix and support the commutator input shaft and the commutator output shaft. The commutator housing provides external support for the forward and reverse commutator. The commutator provides structural support and protection. The commutator housing is connected to the internal gear via a reversing clutch. The commutator input shaft is directly connected to the commutator sun gear and is also connected to the internal gear via a forward clutch. The commutator output shaft is the commutator planetary gear disk, with the planetary gear shaft fixed to the front end face of the commutator output shaft. The first and second commutator planetary gears mesh and rotate around the planetary gear shaft. The rear end face of the commutator output shaft is connected to the parallel shaft gearbox of the next-stage transmission mechanism via a fourth coupling. The forward and reverse commutator can achieve forward and reverse rotation by controlling the engagement and disengagement states of the forward and reverse clutches.

6. A two-stage wind turbine generator according to claim 5, characterized in that, When the reversing clutch is engaged, the internal gear is fixed to the commutator housing and cannot rotate. When the reversing clutch is disengaged, the internal gear is separated from the commutator housing and can rotate freely.

7. A two-stage wind turbine generator according to claim 5, characterized in that, When the forward clutch is engaged, the internal gear is fixedly connected to the commutator input shaft and the commutator sun gear, maintaining rotation in the same direction and at the same speed. When the forward clutch is disengaged, the internal gear disengages and can rotate freely.

8. A two-stage wind turbine generator according to claim 5, characterized in that, When the forward clutch is engaged and the reverse clutch is disengaged, the commutator sun gear and internal gear are fixed together, preventing the first and second commutator planetary gears from rotating freely. Power is transmitted directly from the commutator input shaft to the commutator output shaft, achieving forward rotation at the same speed. Conversely, when the forward clutch is disengaged and the reverse clutch is engaged, the internal gear is fixed to the commutator housing and cannot rotate. Power is transmitted through the commutator input shaft to the commutator sun gear, which meshes with the first commutator planetary gear. The first commutator planetary gear rotates in the opposite direction to the input, and the first and second commutator planetary gears mesh. After power transmission, the second commutator planetary gear rotates in the same direction as the input. Since the internal gear is fixed to the commutator housing and cannot rotate, the power of the second commutator planetary gear is transmitted to the planetary gear shaft. The planetary gear shaft drives the commutator output shaft to rotate. The rotation direction of the commutator output shaft is opposite to that of the second commutator planetary gear, thus realizing that the commutator output shaft and the commutator input shaft rotate in opposite directions. The forward and reverse clutches adopt electronically controlled mechanical or hydraulic devices. The specific state of the two clutches can flexibly switch the direction of rotation based on the signals measured by the wind speed and direction measuring device and the load requirements of the generator.

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