Double-impeller wind driven generator

Abstract

The invention discloses a double-impeller wind driven generator, and belongs to the technical field of wind power generation, the double-impeller wind driven generator comprises a tower, a pivot, two impellers, a transmission mechanism, a generator, a transmission mechanism, a yaw mechanism and a control system, the pivot is rotatably connected with the tower through a bearing, and a cabin is arranged at the top of the pivot; the two impellers are respectively arranged at two opposite ends of the cabin, the rotating direction of one impeller is opposite to that of the other impeller, and the two impellers are in transmission connection with the transmission mechanism; the input end of the generator is connected with the output end of the transmission mechanism; and the yaw mechanism is used for driving the pivot to axially rotate around the tower so as to change the orientation of the impeller. The control system is electrically connected with the transmission mechanism, the impeller mechanism, the generator and the yaw mechanism, and the control system is used for managing operation of the monitoring equipment. According to the invention, the mechanical load of the cabin can be reduced, and the wind energy capture efficiency is improved by optimizing stress distribution and enhancing the structural strength, so that the power generation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, and in particular to a double-impeller wind power generator. Background Art

[0002] In the field of wind power generation, wind turbines are key equipment for converting wind energy into electrical energy, and their performance directly affects power generation efficiency and economic benefits. As the global demand for clean energy continues to rise, the scale of wind power generation continues to expand, and the performance requirements for wind turbines are becoming increasingly stringent.

[0003] Double-blade wind turbines are usually equipped with a yaw mechanism, which is used to drive the impeller to rotate around the vertical axis, so that the impeller can track the change in wind direction and ensure that the impeller always faces the wind directly, so as to improve the efficiency of wind energy capture. In the prior art, the yaw mechanism directly acts on the nacelle, and all yaw forces are concentrated at the connection between the nacelle and the tower, causing the nacelle to bear a large mechanical load. When the wind speed changes greatly or the wind direction changes suddenly, the vibration and impact will directly act on the nacelle, increasing the risk of fatigue damage, thereby affecting the stability of the overall structure of the wind turbine and posing a greater safety hazard. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a double-impeller wind turbine generator, which can reduce the direct force on the nacelle, thereby improving the stability and durability of the overall structure.

[0005] A double-impeller wind turbine according to an embodiment of the present invention comprises: a tower; a pivot, the pivot is arranged in the tower, the pivot is coaxially arranged with the tower, the pivot is rotatably connected with the tower, a nacelle is arranged on the top of the pivot, and the nacelle is fixedly connected with the pivot; two impellers, the two impellers are respectively arranged at opposite ends of the nacelle, and the rotation direction of one impeller is opposite to the rotation direction of the other impeller; a transmission mechanism, the transmission mechanism is arranged in the nacelle, and the two impellers are both transmission-connected with the transmission mechanism; a generator, the generator is arranged in the nacelle, and the input end of the generator is connected with the output end of the transmission mechanism; a rotating mechanism, the rotating mechanism is fixedly connected with the tower mechanism, the rotating mechanism is rotatably connected with the pivot, and the rotating mechanism is used to support the rotation of the pivot; a yaw mechanism, the yaw mechanism is arranged between the tower and the pivot, and the yaw mechanism is used to drive the pivot to rotate around the axial direction of the tower to change the direction of the impeller; a control system, the control system is electrically connected to the impeller, the transmission mechanism, the generator, the rotating mechanism and the yaw mechanism respectively, and the control system is used to manage the operation of the equipment.

[0006] The dual-impeller wind turbine according to the embodiments of the present invention has at least the following beneficial effects: The pivot shaft is coaxially arranged in the tower, and its bottom is rotationally connected to the tower through a bearing, and a nacelle is fixed at the top. A transmission mechanism and a generator are arranged in the nacelle. The two impellers are respectively arranged at both ends of the nacelle, and the two impellers rotate in opposite directions respectively. After the wind drives the impellers to rotate, the transmission mechanism transmits mechanical energy to the generator for power generation. The control system monitors the wind speed, wind direction and the operating state of the equipment in real time. When the wind direction changes, the control system issues an instruction to make the yaw mechanism drive the pivot shaft to rotate around the axis of the tower, so as to drive the nacelle and the impellers to adjust the orientation, ensure that the impellers are always facing the wind, and ensure the stable operation of the system. Thus, the yaw mechanism acts on the pivot shaft instead of the nacelle, and the yaw force is transmitted to the tower through the pivot shaft, reducing the mechanical load of the nacelle. The pivot shaft is connected to the tower through a bearing, providing a more stable rotational support, reducing the impact of vibration and shock on the nacelle, thereby reducing the impact of sudden wind on the nacelle and reducing potential safety hazards. On the other hand, by optimizing the force distribution and enhancing the structural strength, while ensuring the feasibility of yaw operation, the wind energy capture efficiency is improved, thereby improving the power generation efficiency, not only extending the service life of the equipment, but also providing a reliable guarantee for the long-term stable operation of the wind turbine.

[0007] According to some embodiments of the present invention, the yaw mechanism includes a yaw drive assembly. The yaw drive assembly is arranged on the tower, and the yaw drive assembly is connected to the pivot shaft. The yaw drive assembly is used to provide power for the yaw movement of the pivot shaft.

[0008] According to some embodiments of the present invention, the yaw drive assembly includes: a yaw gear ring, the yaw gear ring is arranged on the pivot shaft, and the yaw gear ring is coaxially arranged with the pivot shaft; a yaw gear motor, the yaw gear motor is arranged on the tower, and the yaw gear motor meshes with the yaw gear to cooperate with the yaw gear ring to drive the pivot shaft to rotate.

[0009] According to some embodiments of the present invention, the yaw mechanism further includes a yaw assist assembly. The yaw assist assembly is arranged on the tower, and the yaw assist assembly is connected to the pivot shaft. The yaw assist assembly is used to assist the yaw drive assembly to make the pivot shaft rotate smoothly.

[0010] According to some embodiments of the present invention, the yaw assist assembly includes a plurality of assist gears. The plurality of assist gears are all arranged on the tower, and each assist gear meshes with the yaw gear ring. The yaw gear motor and the plurality of assist gears are evenly distributed along the circumferential direction on the periphery of the pivot shaft.

[0011] According to some embodiments of the present invention, a braking member is arranged on the yaw gear motor. The braking member is configured to lock the yaw gear motor when the yaw action stops to prevent the unexpected rotation of the pivot shaft.

[0012] According to some embodiments of the present invention, the yaw drive assembly further includes a plurality of weather sensors, and the plurality of weather sensors are disposed on at least one of the tower, the nacelle, and the impeller. The weather sensors are electrically connected to the control system. The weather sensors monitor weather data in real time and feedback it to the control system. The control system sends an instruction to drive the yaw gear motor, so that the yaw ring drives the pivot to rotate and adjusts the yaw of the impeller to align with the wind direction.

[0013] According to some embodiments of the present invention, the rotating mechanism includes: a first bearing, the first bearing is disposed at the bottom of the pivot, and the pivot is rotatably connected to the tower through the first bearing. The first bearing is configured to support the weights of the pivot and the nacelle and allow the pivot to rotate within the tower; a second bearing, the second bearing is disposed at the top of the pivot, and the second bearing is fixedly disposed on the inner wall of the tower. The second bearing is configured to support the radial load of the second bearing.

[0014] According to some embodiments of the present invention, the yaw mechanism further includes a plurality of yaw limit assemblies. The plurality of yaw limit assemblies are circumferentially disposed on the tower, and the plurality of yaw limit assemblies are all connected to the pivot. The plurality of yaw limit assemblies are evenly distributed on the periphery of the first bearing. The yaw limit assembly is configured to radially adjust the vertical state of the pivot so that the axis of the pivot remains vertical.

[0015] According to some embodiments of the present invention, the transmission mechanism includes: two first bevel gears, each impeller is correspondingly provided with a first bevel gear, and each first bevel gear is connected to the corresponding impeller through a drive shaft; a second bevel gear, the tops of the two first bevel gears are jointly engaged with the second bevel gear, and a transmission shaft is fixedly connected to the top of the second bevel gear; a third bevel gear, the third bevel gear is coaxially disposed with the second bevel gear, and the third bevel gear is disposed at one end of the transmission shaft away from the second bevel gear; a planetary gear set, a fourth bevel gear is provided at the input end of the planetary gear set, the bottom of the fourth bevel gear is engaged with the third bevel gear, and the output end of the planetary gear set is connected to the generator.

[0016] According to some embodiments of the present invention, the planetary gear set includes a first planetary gear and a second planetary gear. The first planetary gear and the second planetary gear are coaxially disposed. The input end of the first planetary gear is in transmission connection with the output end of the fourth bevel gear. The input end of the second planetary gear is in transmission connection with the output end of the first planetary gear. The second planetary gear is located at one end of the first planetary gear away from the fourth bevel gear. The output end of the second planetary gear is in transmission connection with the high-speed shaft. The other end of the high-speed shaft penetrates through the fourth bevel gear and is connected to the power shaft of the generator through a coupling.

[0017] According to some embodiments of the present invention, a maintenance ladder is provided inside the pivot. The maintenance ladder is used to realize the passage between the nacelle, the pivot, and the tower, so as to facilitate the maintenance and management of the equipment.

[0018] According to some embodiments of the present invention, it further includes a braking mechanism, and at least one of the two impellers, the transmission mechanism, and the generator is connected to the braking mechanism, and the braking mechanism is used to ensure the safe operation of the device.

[0019] According to some embodiments of the present invention, a plurality of seals are provided on the nacelle, and each seal is located between the nacelle and the impeller, and the seal is configured to block dust in the air from entering the nacelle.

[0020] According to some embodiments of the present invention, the seal includes a sealing cavity, and a plurality of first panels and a plurality of second panels alternately arranged on the inner wall of the sealing cavity along the air flow direction.

[0021] According to some embodiments of the present invention, the impeller includes a plurality of blades, and the angle between the blade close to the nacelle side and the tower is α, where 2° < α < 6°.

[0022] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present invention. Description of the Drawings

[0023] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0024] Figure 1 is the front view of the dual-impeller wind turbine according to the embodiment of the present invention;

[0025] Figure 2 is the side view of the dual-impeller wind turbine according to the embodiment of the present invention;

[0026] Figure 3 is Figure 2 the structural schematic diagram of the central shaft and the nacelle;

[0027] Figure 4 is Figure 3 the sectional view of A-A in;

[0028] Figure 5 is Figure 3 the sectional view of B-B in;

[0029] Figure 6 is Figure 3 the sectional view of the yaw drive assembly and the yaw assist assembly in;

[0030] Figure 7 is Figure 3 the sectional view of C-C in;

[0031] Figure 8 is Figure 7 the structural schematic diagram in;

[0032] Figure 9 is Figure 3 a schematic structural diagram of the middle nacelle;

[0033] Figure 10 is Figure 9 a schematic structural diagram of the middle transmission mechanism;

[0034] Figure 11 is Figure 9 an enlarged schematic diagram of part A in it;

[0035] Reference numerals:

[0036] Tower 100;

[0037] Pivot 200, nacelle 210, seal 211, seal cavity 2111, first panel 2112, second panel 2113, maintenance ladder 220;

[0038] Impeller 300, blade 310;

[0039] Transmission mechanism 400, first bevel gear 410, drive shaft 411, second bevel gear 420, transmission shaft 421, third bevel gear 430, planetary gear set 440, first planetary gear 441, second planetary gear 442, high-speed shaft 443, fourth bevel gear 450;

[0040] Generator 500, coupling 510, power shaft 520;

[0041] Rotating mechanism 600, first bearing 610, second bearing 620;

[0042] Yaw mechanism 700, yaw drive assembly 710, yaw ring gear 711, yaw gear motor 712, yaw auxiliary assembly 720, auxiliary gear 721, yaw limit assembly 730, adjustment drive member 731, support base 732, adjustment block 733;

[0043] Braking mechanism 800. Detailed implementation manners

[0044] In the description of the present invention, it should be understood that for the orientation descriptions, such as up, down, front, back, left, right, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0045] In the description of the present invention, the meaning of "several" is one or more, the meaning of "multiple" is more than two. Understandings such as "greater than", "less than", "exceeding", etc. do not include the corresponding number, and understandings such as "above", "below", "within", etc. include the corresponding number. If there is a description of "first", "second", etc., it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0046] In the description of the present invention, unless otherwise clearly defined, terms such as "arranged", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0047] Please refer to Figures 1 to 9 , this embodiment discloses a dual-impeller wind turbine, including a tower 100, a pivot 200, two impellers 300, a transmission mechanism 400, a generator 500, a rotating mechanism 600, a yaw mechanism 700 and a control system. Among them, the pivot 200 is arranged in the tower 100, the pivot 200 is coaxially arranged with the tower 100, the pivot 200 is rotatably connected to the tower 100, and a nacelle 220 is arranged at the top of the pivot 200, and the nacelle 220 is fixedly connected to the pivot 200. Two impellers 300, the two impellers 300 are respectively arranged at opposite ends of the nacelle 220, and the rotation direction of one impeller 300 is opposite to that of the other impeller 300. The transmission mechanism 400, the transmission mechanism 400 is arranged in the nacelle 220, and both impellers 300 are in transmission connection with the transmission mechanism 400. The generator 500, the generator 500 is arranged in the nacelle 220, and the input end of the generator 500 is connected to the output end of the transmission mechanism 400. The rotating mechanism 600, the rotating mechanism 600 is fixedly connected to the tower 100, the rotating mechanism 600 is rotatably connected to the pivot 200, and the rotating mechanism 600 is used to support the rotation of the pivot 200. The yaw mechanism 600, the yaw mechanism 600 is arranged between the tower 100 and the pivot 200, and the yaw mechanism 600 is used to drive the pivot 200 to rotate around the axis of the tower 100 to change the orientation of the impeller 300. The control system, the control system is electrically connected to the impeller 300, the transmission mechanism 400, the generator 500, the rotating mechanism and the yaw mechanism 600 respectively, and the control system is used to manage the operation of the equipment.

[0048] As Figures 1 to 4As shown, the pivot 200 is coaxially arranged inside the tower 100. Its bottom is rotatably connected to the tower 100 through a rotating mechanism 600, and the nacelle 210 is fixed at the top. A transmission mechanism 400 and a generator 500 are arranged inside the nacelle 210. Two impellers 300 are respectively arranged at both ends of the nacelle 210. Among them, the two impellers 300 rotate in opposite directions respectively. After the wind drives the impellers 300 to rotate, the transmission mechanism 400 transmits mechanical energy to the generator 500 for power generation. The control system monitors the wind speed, wind direction and the operating state of the equipment in real time. When the wind direction changes, the control system issues an instruction to make the yaw mechanism 700 drive the pivot 200 to rotate around the axis of the tower 100, so as to drive the nacelle 210 and the impellers 300 to adjust the orientation, ensure that the impellers 300 always face the wind, and ensure the stable operation of the system.

[0049] The yaw mechanism 700 acts on the pivot 200 instead of the nacelle 210. The yaw force is transmitted to the tower 100 through the pivot 200, reducing the mechanical load of the nacelle 210. The pivot 200 is connected to the tower 100 through a bearing 610, providing a more stable rotational support, reducing the impact of vibration and shock on the nacelle 210. Thus, the impact of sudden wind on the nacelle 210 is reduced, and the potential safety hazard is lowered. On the other hand, by optimizing the force distribution and enhancing the structural strength, while ensuring the feasibility of yaw operation, the wind energy capture efficiency is improved, thereby improving the power generation efficiency. This not only extends the service life of the equipment, but also provides a reliable guarantee for the long-term stable operation of the wind turbine 500.

[0050] It should be noted that the coordinated operation of the dual-impeller 300 design and the control system further improves the wind energy capture efficiency and power generation. At the same time, the design of the dual-impeller 300 rotating in opposite directions can further cancel out part of the torque, thus reducing the torsional stress of the nacelle 210 and the tower 100, and enhancing the stability of the overall structure.

[0051] In some specific embodiments of the present invention, the yaw mechanism 700 includes a yaw drive assembly 710. The yaw drive assembly 710 is arranged on the tower 100. The yaw drive assembly 710 is connected to the pivot 200, and the yaw drive assembly 710 is used to provide power for the yaw movement of the pivot 200. As Figure 2 and Figure 3 shown, the yaw drive assembly 710 is installed on the tower 100 and is connected to the pivot 200 to provide power for the yaw movement of the pivot 200, driving the pivot 200 to rotate around the axis of the tower 100, so as to adjust the orientation of the impellers 300.

[0052] In some specific embodiments of the present invention, the yaw drive assembly 710 includes a yaw ring gear 711 and a yaw gear motor 712. The yaw ring gear 711 is disposed on the pivot shaft 200, and the yaw ring gear 711 is coaxially arranged with the pivot shaft 200. The yaw gear motor 712 is disposed on the tower 100, and the yaw gear motor 712 meshes with the yaw gear to cooperate with the yaw ring gear 711 to drive the pivot shaft 200 to rotate.

[0053] As Figure 6 shown, the yaw gear motor 712 meshes with the yaw ring gear 711. The yaw ring gear 711 is coaxially arranged with the pivot shaft 200. The yaw gear motor 712 drives the yaw gear to rotate, thereby driving the pivot shaft 200 to rotate axially around the tower 100 to adjust the orientation of the impeller 300 to align with the wind direction. It should be noted that the meshing transmission between the yaw gear motor 712 and the ring gear 711 can achieve precise angle control and can also achieve forward and reverse rotation, enabling the nacelle to flexibly adjust its position according to the wind direction change, ensuring that the nacelle accurately aligns with the wind direction, and improving the wind energy capture efficiency.

[0054] In some specific embodiments of the present invention, the yaw mechanism 700 further includes a yaw auxiliary assembly 720. The yaw auxiliary assembly 720 is disposed on the tower 100, and the yaw auxiliary assembly 720 is connected to the pivot shaft 200. The yaw auxiliary assembly 720 is used to assist the yaw drive assembly 710 to enable the pivot shaft 200 to rotate smoothly.

[0055] In some specific embodiments of the present invention, the yaw auxiliary assembly 720 includes a plurality of auxiliary gears 721. The plurality of auxiliary gears 721 are all disposed on the tower 100, and each auxiliary gear 721 meshes with the yaw ring gear 711. The yaw gear motor 712 and the plurality of auxiliary gears 721 are evenly distributed circumferentially on the periphery of the pivot shaft 200.

[0056] As Figure 6 shown, the yaw auxiliary assembly 720 is disposed on the tower 100, and it is on the same horizontal plane as the yaw drive assembly 710. Specifically, the yaw ring gear 711 is coaxially sleeved outside the pivot shaft 200, and the yaw ring gear 711 is located at the bottom of the pivot shaft 200. In this specific embodiment, two auxiliary gears 721 are provided. The two auxiliary gears 721 are both installed on the tower 100. The yaw gear motor 712 and the auxiliary gears 721 are evenly distributed circumferentially on the periphery of the pivot shaft 200, and both the auxiliary gears 721 and the yaw gear motor 712 mesh with the yaw ring gear 711 at the top. When the yaw gear motor 712 drives the yaw gear to rotate, the yaw gear motor 712 provides the drive, and the two auxiliary gears 721 and the yaw gear motor 712 jointly provide support to ensure the smoothness and accuracy of the yaw movement.

[0057] In some specific embodiments of the present invention, the yaw drive assembly 710 further includes a plurality of weather sensors, and the plurality of weather sensors are disposed on at least one of the tower 100, the nacelle 210, and the impeller 300. The weather sensors are electrically connected to the control system. The weather sensors monitor weather data in real time and feed it back to the control system. The control system sends an instruction to drive the yaw gear motor 712, so that the yaw ring gear 711 drives the pivot 200 to rotate, and adjusts the yaw of the impeller 300 to align with the wind direction.

[0058] In some specific embodiments of the present invention, the yaw gear motor 712 is equipped with a braking member, and the braking member is configured to lock the yaw gear motor 712 when the yaw action stops, to prevent unexpected rotation of the pivot 200. Specifically, the braking member includes, but is not limited to, an electromagnetic brake and a mechanical brake. Specifically, when the weather sensor detects a change in the wind direction, the control system drives the yaw gear motor 712 to drive the yaw ring gear 711 to rotate, so that the pivot 200 rotates and adjusts the orientation of the impeller 300. Once the impeller 300 is aligned with the wind direction, the braking member is activated to brake the pivot 200 and prevent it from continuing to rotate due to wind force or inertia, ensuring that the impeller 300 is stably maintained in the position aligned with the wind direction. It should be noted that the braking member can also lock the pivot 200 in strong winds or emergency situations to prevent excessive yaw or accidental rotation, thereby improving the safety and stability of the system.

[0059] In some specific embodiments of the present invention, the rotating mechanism 600 includes: a first bearing 610, the first bearing 610 is disposed at the bottom of the pivot 200, and the pivot 200 is rotatably connected to the tower 100 through the first bearing 610. The first bearing 610 is configured to support the weights of the pivot 200 and the nacelle 210, and allow the pivot 200 to rotate within the tower 100; a second bearing 620, the second bearing 620 is disposed at the top of the pivot 200, and the second bearing 620 is fixedly disposed on the inner wall of the tower 100. The second bearing 620 is configured to support the radial load of the second bearing 620.

[0060] Specifically, the first bearing 610 includes, but is not limited to, a roller bearing, and the second bearing 620 includes, but is not limited to, a slewing bearing.

[0061] In some specific embodiments of the present invention, the yaw mechanism 700 further includes a plurality of yaw limit assemblies 730. The plurality of yaw limit assemblies 730 are circumferentially disposed on the tower 100, evenly distributed on the periphery of the bearing 610, and the plurality of yaw limit assemblies 730 are all connected to the pivot 200. The yaw limit assembly 730 is configured to radially adjust the vertical state of the pivot 200, so that the axis of the pivot 200 remains vertical.

[0062] Such as Figure 7 and Figure 8As shown in the figure, the yaw limit assembly 730 includes an adjustment driving member 731, a support base 732, and an adjustment block 733. The support base 732 is fixed to the tower 100. The adjustment driving member 731 is installed on the support base 732. The adjustment block 733 is in transmission connection with the output end of the adjustment driving member 731. The adjustment block 733 is configured to fit the shape of the outer wall of the pivot shaft 200. The adjustment driving member 731 controls the adjustment block 733 to move radially along the pivot shaft 200 to finely adjust the vertical state of the pivot shaft 200. Thus, when the axis of the pivot shaft 200 deviates from the vertical state, the control system issues an instruction to drive the limit blocks in the plurality of yaw limit assemblies 730 to move radially to adjust the position of the pivot shaft 200 so that its axis returns to the vertical state, ensuring the accuracy and stability of the adjustment.

[0063] In this specific embodiment, three yaw limit assemblies 730 are provided, and the three yaw limit assemblies 730 are evenly distributed on the periphery of the bearing 610 of the pivot shaft 200.

[0064] In some specific embodiments of the present invention, the transmission mechanism 400 includes: two first bevel gears 410, each impeller 300 is correspondingly provided with a first bevel gear 410, and each first bevel gear 410 is connected to the corresponding impeller 300 through a drive shaft 411; a second bevel gear 420, the tops of the two first bevel gears 410 are commonly engaged with the second bevel gear 420, and the top of the second bevel gear 420 is fixedly connected to a transmission shaft 421; a third bevel gear 430, the third bevel gear 430 is coaxially arranged with the second bevel gear 420, and the third bevel gear 430 is arranged at one end of the transmission shaft 421 away from the second bevel gear 420; a planetary gear set 440, the input end of the planetary gear set 440 is provided with a fourth bevel gear 450, the bottom of the fourth bevel gear 450 is engaged with the third bevel gear 430, and the output end of the planetary gear set 440 is connected to the generator 500.

[0065] As Figure 9 and Figure 10As shown, the two first bevel gears 410 are respectively arranged at the left and right ends of the second bevel gear 420, and the two first bevel gears 410 are meshed with the second bevel gear 420 together. A transmission shaft 421 is coaxially arranged on the top of the second bevel gear 420, and a third bevel gear 430 is coaxially arranged on the top of the transmission shaft 421, wherein a load-bearing bearing 610 is sleeved on the transmission shaft 421, and the load-bearing bearing 610 is located between the second bevel gear 420 and the third bevel gear 430. The fourth bevel gear 450 meshes with the third bevel gear 430 located at the bottom of the fourth bevel gear 450, the input end of the planetary gear set 440 is transmission-connected with the fourth bevel gear 450, and the output end of the planetary gear set 440 is connected to the generator 500 through the high-speed shaft 443. Specifically, the output end of the planetary gear set 440 is located on the left side of the third bevel gear 430, then the left end of the high-speed shaft 443 is fixedly connected to the planetary gear, and the right end thereof penetrates the fourth bevel gear 450 and is connected to the power shaft 520 of the generator 500 through the coupling 510. Therefore, when the wind blows toward the impeller 300, the two impellers 300 start to rotate in the case of being coaxially arranged and rotating in opposite directions, converting the wind energy into mechanical energy, and the mechanical energy of the two fan impellers 300 is transmitted to the corresponding first bevel gear 410 through the drive shaft 411, and is transmitted to the third bevel gear 430 through the second bevel gear 420 and the transmission shaft 421. The third bevel gear 430 transmits mechanical energy to the fourth bevel gear 450, driving the planetary gear set 440 to operate. The planetary gear set 440 realizes the speed increasing function and transmits the mechanical energy to the generator 500 via the high-speed shaft 443. The generator 500 converts the mechanical energy into electrical energy for output.

[0066] In some specific embodiments of the present invention, the planetary gear set 440 includes a first planetary gear 441 and a second planetary gear 442, the first planetary gear 441 and the second planetary gear 442 are coaxially arranged, the input end of the first planetary gear 441 is transmission connected to the output end of the fourth bevel gear 450, the input end of the second planetary gear 442 is transmission connected to the output end of the first planetary gear 441, the second planetary gear 442 is located at one end of the first planetary gear 441 away from the fourth bevel gear 450, the output end of the second planetary gear 442 is transmission connected to the high-speed shaft 443, and the other end of the high-speed shaft 443 passes through the fourth bevel gear 450 and is connected to the power shaft 520 of the generator 500 through the coupling 510.

[0067] Specifically, when the fourth bevel gear 450 rotates, the fourth bevel gear drives the planet carrier of the first planetary gear 441 to rotate, so that the planetary gear of the first planetary gear 441 rotates around the fixed inner ring gear with reference to the fixed inner ring gear, and drives the sun gear of the first planetary gear 441 to accelerate. The sun gear of the first planetary gear 441 is connected to the planet carrier of the second planetary gear 442 by transmission. Based on the inner ring gear that is also fixedly set, the planetary gear of the second planetary gear 442 rotates around the sun gear, and further accelerates the rotation of the sun gear of the second planetary gear 442. The accelerated rotation of the sun gear finally drives the generator 500 to rotate, thereby generating electricity.

[0068] In some specific embodiments of the present invention, a maintenance ladder 220 is provided inside the pivot 200, and the maintenance ladder 220 is used to achieve access between the nacelle 210, the pivot 200 and the tower 100, so as to facilitate maintenance and management of the equipment. Figure 3 As shown, the maintenance ladder 220 arranged inside the pivot 200 extends upward from the bottom of the pivot 200 to the inside of the cabin 210, which provides a safe passage from the pivot 200 to the cabin 210 for the maintenance personnel, ensuring the safety and convenience of the maintenance personnel during the climbing process, not only improving the safety and maintainability of the equipment, but also reducing the maintenance cost, and is an indispensable part of the design of the wind turbine 500.

[0069] like Figure 9 and Figure 10 As shown, in this specific embodiment, the braking mechanism 800 is connected to the planetary gear in the transmission mechanism 400. Specifically, the braking mechanism 800 is connected to the high-speed shaft 443. The braking force interacts with the rotation speed of the high-speed shaft 443, so that the rotation speed of the high-speed shaft 443 gradually decreases, thereby being able to quickly and effectively stop the high-speed rotating components or limit their rotation speed, ultimately achieving the purpose of stopping or stabilizing within a safe speed range, thereby ensuring the safe operation of the equipment.

[0070] In some specific embodiments, the brake mechanism 800 and the brake member are hydraulic brakes, and the clamping and releasing of the brake pads are controlled by the hydraulic system, that is, when the impeller 300 is aligned with the wind direction, the control system sends a signal, the hydraulic brake clamps the brake pads, and fixes the position of the pivot 200.

[0071] In some specific embodiments, the braking mechanism 800 and the braking member are electromagnetic brakes, which control the movement of the brake pads through electromagnetic force and are installed near the yaw gear motor 712 or the auxiliary gear 721. That is, when the yaw action is completed, the electromagnetic brake is energized to generate magnetic force, causing the brake pads to clamp the yaw gear ring 711 or the pivot 200 to achieve braking and positioning.

[0072] In some specific embodiments, the braking mechanism 800 is a mechanical brake. The mechanical brake adopts a mechanical locking device, such as a ratchet and a caliper, etc., and is installed on the yaw ring gear 711 or the pivot 200. When the impeller 300 is aligned with the wind direction, the mechanical brake is locked manually or automatically to fix the position of the pivot 200.

[0073] In some specific embodiments of the present invention, a braking mechanism 800 is further included. At least one of the two impellers 300, the transmission mechanism 400, and the generator 500 is connected to the braking mechanism 800. The braking mechanism 800 is used to ensure the safe operation of the device. In this specific embodiment, the braking mechanism 800 is arranged at the left end of the planetary gear set 440 and is in transmission connection with the high-speed shaft 443. In an emergency, the braking mechanism 800 can act quickly to stop the rotation of the generator rotor through the high-speed shaft 443, avoiding equipment damage or accidents.

[0074] In some specific embodiments of the present invention, a plurality of seals 211 are provided on the nacelle 210. Each seal 211 is located between the nacelle 210 and the impeller 300. The seal 211 is configured to block dust in the air from entering the nacelle 210.

[0075] In some specific embodiments of the present invention, the seal 211 includes a sealing cavity 2111, and a plurality of first panels 2112 and a plurality of second panels 2113 that are alternately arranged on the inner wall of the sealing cavity 2111 along the air flow direction. The plurality of first panels 2112 and the plurality of second panels 2113 are alternately arranged to form a circuitous air flow path.

[0076] As Figure 9 and Figure 11 shown, four seals 211 are provided on the nacelle 210. Among them, two seals 211 are provided between each impeller 300 and the nacelle 210. It should be noted that the impeller 300 will stir the surrounding air during rotation, making it easy for dust and other impurities in the air to move towards the nacelle 210 along with the air flow. By arranging the seal 211 between the nacelle 210 and the impeller 300, it is possible to block dust and other impurities before they enter the nacelle 210, avoid dust from entering the interior of the nacelle 210, thereby protecting precision equipment such as generators and transmission devices in the nacelle 210, preventing dust from causing adverse effects such as wear and short circuits to the equipment, extending the service life of the equipment, and ensuring the stable operation of the wind power generation system.

[0077] Furthermore, during actual operation, the wind direction and wind speed are constantly changing. In different wind speed layers or different air flow environments, when the wind direction suddenly changes or the wind speed changes sharply, the air flow state around the nacelle 210 will also change accordingly. Under certain specific combinations of wind direction and wind speed, it may cause the air inside the nacelle 210 to be unable to be discharged in time in a short period, and the air flow outside the nacelle 210 is affected by the new wind direction and wind speed, resulting in a relatively increased internal pressure of the nacelle, forming an outward pressure difference, and blowing the dust staying on the first panel 2112 and the second panel 2113 out of the nacelle, thereby realizing the self-cleaning function of the seal 211.

[0078] Furthermore, at the non-connected end of each first panel 2112 and the seal cavity 2111, a first wing plate is provided, and at the non-connected end of each second panel 2113 and the seal cavity 2111, a second wing plate is provided. The first wing plate is perpendicular to the first panel 2112, and the second wing plate is perpendicular to the second panel 2114. The two form a retaining wall in the air flow channel to block dust from entering the interior of the nacelle through the air flow channel.

[0079] In some specific embodiments of the present invention, the impeller 300 includes a plurality of blades 310. There is a certain installation angle α between the blades 310 close to the nacelle 300 and the tower 100, where 2° < α < 6°. In this specific embodiment, each wind wheel has two blades. The installation angle between the blade 310 at the front end and the tower 100 is 5°. Thus, when the front blade 310 is inclined at a certain angle towards the incoming wind direction, the blade 310 can maintain a more appropriate distance from the tower 100 during rotation, making the movement trajectory of the blade 310 away from the tower 100, thereby reducing the risk of the blade 310 swinging greatly due to the influence of the wind and touching the tower 100.

[0080] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of the present invention.

Claims

1. A double-impeller wind turbine, characterized in that: include: Tower (100); A pivot (200), the pivot (200) being disposed in the tower (100), the pivot (200) being coaxially disposed with the tower (100), the pivot (200) being rotatably connected to the tower (100), a cabin (210) being disposed on the top of the pivot (200), and the cabin (210) being fixedly connected to the pivot (200); two impellers (300), the two impellers (300) being respectively arranged at opposite ends of the nacelle (210), and the rotation direction of one impeller (300) being opposite to the rotation direction of the other impeller (300); a transmission mechanism (400), wherein the transmission mechanism (400) is disposed in the nacelle (210), and the two impellers (300) are both in transmission connection with the transmission mechanism (400); a generator (500), the generator (500) being arranged in the nacelle (210), and the input end of the generator (500) being connected to the output end of the transmission mechanism (400); A rotating mechanism (600), wherein the rotating mechanism (600) is fixedly connected to the tower (100), the rotating mechanism (600) is rotatably connected to the pivot (200), and the rotating mechanism (600) is used to support the rotation of the pivot (200); a yaw mechanism (700), the yaw mechanism (700) being arranged between the tower (100) and the pivot (200), the yaw mechanism (700) being used to drive the pivot (200) to rotate around the axial direction of the tower (100) so as to change the orientation of the impeller (300); A control system, wherein the control system is electrically connected to the impeller (300), the transmission mechanism (400), the generator (500), the rotation mechanism (600) and the yaw mechanism (700), respectively, and the control system is used to manage the operation of the equipment.

2. The double-impeller wind turbine according to claim 1, characterized in that: The yaw mechanism (700) comprises a yaw drive assembly (710), wherein the yaw drive assembly (710) is arranged on the tower (100), the yaw drive assembly (710) is connected to the pivot (200), and the yaw drive assembly (710) is used to provide power for the yaw movement of the pivot (200).

3. The double-impeller wind turbine according to claim 2, characterized in that: The yaw mechanism (700) further comprises a yaw auxiliary component (720), wherein the yaw auxiliary component (720) is arranged on the tower (100), the yaw auxiliary component (720) is connected to the pivot (200), and the yaw auxiliary component (720) is used to assist the yaw drive component (710) so as to enable the pivot (200) to rotate smoothly.

4. The double-impeller wind turbine according to claim 3, characterized in that: The yaw drive assembly (710) comprises: A yaw gear ring (711), wherein the yaw gear ring (711) is disposed on the pivot (200), and the yaw gear ring (711) and the pivot (200) are coaxially arranged; A yaw gear motor (712), wherein the yaw gear motor (712) is disposed on the tower (100), and the yaw gear motor (712) is meshed with the yaw gear, so that the yaw gear ring (711) cooperates to drive the pivot (200) to rotate.

5. The double-impeller wind turbine according to claim 4, characterized in that: The yaw auxiliary assembly (720) comprises a plurality of auxiliary gears (721), the plurality of auxiliary gears (721) are all arranged on the tower (100), each of the auxiliary gears (721) is meshed with the yaw gear ring (711), and the yaw gear motor (712) and the plurality of auxiliary gears (721) are evenly distributed along the circumference of the pivot (200) in the annular direction.

6. The double-impeller wind turbine according to claim 5, characterized in that: The yaw gear motor (712) is equipped with a brake, which is configured to lock the yaw gear motor (712) when the yaw action stops, so as to prevent the pivot (200) from rotating unexpectedly.

7. The double-impeller wind turbine according to claim 4, characterized in that: The yaw drive assembly (710) further comprises a plurality of meteorological sensors, wherein the plurality of meteorological sensors are arranged on at least one of the tower (100), the nacelle (210) and the impeller (300), and the meteorological sensor is electrically connected to the control system. The meteorological sensor monitors meteorological data in real time and feeds back to the control system. The control system sends instructions to drive the yaw gear motor (712), so that the yaw gear ring (711) drives the pivot shaft (200) to rotate, thereby adjusting the yaw of the impeller (300) to align with the wind direction.

8. The double-impeller wind turbine according to claim 1, characterized in that: The rotating mechanism (600) comprises: a first bearing (610), the first bearing (610) being disposed at the bottom of the pivot (200), the pivot (200) being rotatably connected to the tower (100) through the first bearing (610), the first bearing (610) being configured to support the weight of the pivot (200) and the nacelle (210) and to allow the pivot (200) to rotate within the tower (100); A second bearing (620), wherein the second bearing (620) is disposed at the top of the pivot (200), the second bearing (620) is fixed to the inner wall of the tower (100), and the second bearing (620) is configured to support a radial load of the second bearing (620).

9. The double-impeller wind turbine according to claim 8, characterized in that: The yaw mechanism (700) further comprises a plurality of yaw limit assemblies (730), wherein the plurality of yaw limit assemblies (730) are all arranged on the tower (100) along the circumferential direction, the plurality of yaw limit assemblies (730) are all connected to the pivot (200), the plurality of yaw limit assemblies (730) are evenly distributed on the periphery of the first bearing (610), and the yaw limit assemblies (730) are configured to be able to adjust the vertical state of the pivot (200) along the radial direction so as to keep the axis of the pivot (200) vertical.

10. The double-impeller wind turbine according to claim 1, characterized in that: The transmission mechanism (400) comprises: two first bevel gears (410), each impeller (300) being provided with a corresponding first bevel gear (410), and each first bevel gear (410) being connected to the corresponding impeller (300) via a driving shaft (411); A second bevel gear (420), the tops of the two first bevel gears (410) being meshed with the second bevel gear (420), and the tops of the second bevel gears (420) being fixedly connected to a transmission shaft (421); a third bevel gear (430), the third bevel gear (430) being coaxially arranged with the second bevel gear (420), and the third bevel gear (430) being arranged at an end of the transmission shaft (421) away from the second bevel gear (420); A planetary gear set (440), wherein a fourth bevel gear (450) is provided at an input end of the planetary gear set (440), a bottom of the fourth bevel gear (450) is meshed with the third bevel gear (430), and an output end of the planetary gear set (440) is connected to the generator (500).

11. The double-impeller wind turbine according to claim 10, characterized in that: The planetary gear set (440) comprises a first planetary gear (441) and a second planetary gear (442), wherein the first planetary gear (441) and the second planetary gear (442) are coaxially arranged, the input end of the first planetary gear (441) is transmission-connected to the output end of the fourth bevel gear (450), the input end of the second planetary gear (442) is transmission-connected to the output end of the first planetary gear (441), the second planetary gear (442) is located at one end of the first planetary gear (441) away from the fourth bevel gear (450), the output end of the second planetary gear (442) is transmission-connected to a high-speed shaft (443), and the other end of the high-speed shaft (443) passes through the fourth bevel gear (450) and is connected to a power shaft (520) of the generator (500) through a coupling (510).

12. The double-impeller wind turbine according to claim 1, characterized in that: A maintenance ladder (220) is provided inside the pivot (200), and the maintenance ladder (220) is used to achieve passage between the nacelle (210), the pivot (200) and the tower (100), so as to facilitate maintenance and management of equipment.

13. The double-impeller wind turbine according to any one of claims 1 to 12, characterized in that: It also includes a braking mechanism (800), and at least one of the two impellers (300), the transmission mechanism (400) and the generator (500) is connected to the braking mechanism (800), and the braking mechanism (800) is used to ensure the safe operation of the equipment.

14. The double-impeller wind turbine according to claim 1, characterized in that: The nacelle (210) is provided with a plurality of seals (211), each of the seals (211) is located between the nacelle (210) and the impeller (300), and the seals (211) are configured to prevent dust in the air from entering the nacelle (210).

15. The double-impeller wind turbine according to claim 14, characterized in that: The sealing member (211) comprises a sealing cavity (2111), and a plurality of first panels (2112) and a plurality of second panels (2113) which are alternately arranged on the inner wall of the sealing cavity (2111) along an air circulation direction.

16. The double-impeller wind turbine according to claim 1, characterized in that: The impeller (300) comprises a plurality of blades (310), and the angle between the blades (310) on a side close to the nacelle (300) and the tower (100) is α, wherein 2°<α<6°.

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