Coaxial vertical wind power generation system

Abstract

The utility model provides a coaxial vertical wind power generation system, which relates to the technical field of wind power generation and comprises a generator assembly and a step-up gear box. The generator assembly includes a first housing and a motor shaft rotatably mounted to the first housing. The step-up gear box comprises a second shell, an input shaft, a low-speed transmission unit and a high-speed transmission unit. The first shell is connected with the second shell. The input shaft is rotatably matched with the second shell and penetrates through the motor shaft, one end of the input shaft is used for being connected with the blade shaft, and the other end of the input shaft is connected with the input end of the low-speed transmission unit; the low-speed transmission unit and the high-speed transmission unit are both installed on the second shell, the output end of the low-speed transmission unit is connected with the input end of the high-speed transmission unit, and the output end of the high-speed transmission unit is connected with the motor shaft. The high-speed transmission unit is located on one side of the low-speed transmission unit close to the blade shaft. When the power generation system operates, the high-speed shaft end sealing effect is good, sealing is not prone to failure, and the service life is long.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power generation, and particularly relates to a coaxial vertical wind power generation system. Background Art

[0002] The micro-wind power generator speed increaser is mainly applied to the new micro-wind power generation technology field for torque adjustment. The speed increaser can also be called a speed increasing gearbox. The relative position of the micro-wind power generator speed increaser with respect to the generator is mainly in two layout forms: vertical and horizontal. In the prior art, the speed increasers adopted by vertical wind turbines have at least the following problems:

[0003] 1. The speed increasers adopted by vertical wind turbines are all vertical speed increasers. The generator is installed at the lower part of the speed increaser, resulting in the high-speed end oil seal being located at the bottom of the gearbox, which is an oil-immersed seal. The metal particles of the lubricating oil in the box body are easily deposited at the bottom oil seal lip under the action of gravity, accelerating the lip wear. At the same time, the liquid level of the lubricating oil above the oil seal is relatively high, generating a greater pressure on the lip, further increasing the lip wear and reducing the service life of the oil seal. In addition, the bottom oil seal needs to adopt a contact seal with spring pre-tightening, and the lip friction pressure is relatively large, greatly increasing the starting torque and reducing the power generation efficiency to a certain extent.

[0004] 2. Conventional coaxial gearboxes all adopt a multi-stage NGW planetary series structure. Limited by the single-stage reasonable speed ratio range (3 - 6) of the NGW planetary structure, for a micro-wind power generation assembly with a speed ratio > 40, a 3-stage NGW planetary series structure needs to be adopted. The relatively large number of transmission stages limits the power generation efficiency of the power generation assembly, increases the number, quality, and manufacturing cost of parts, and is not conducive to improving product performance, reducing costs, and enhancing market competitiveness. Content of the Utility Model

[0005] The purpose of the utility model includes providing a coaxial vertical wind power generation system, which can reduce the load of the high-speed end oil seal assembly, extend the service life of the high-speed end oil seal assembly, and reduce the maintenance and replacement cost.

[0006] The embodiments of the utility model can be implemented as follows:

[0007] In a first aspect, the utility model provides a coaxial vertical wind power generation system, comprising:

[0008] A generator assembly and a speed increasing gearbox; the generator assembly includes a first housing and a motor shaft, and the motor shaft is rotatably installed in the first housing;

[0009] The speed increasing gearbox includes a second housing, an input shaft, a low-speed transmission unit, and a high-speed transmission unit; the first housing and the second housing are connected; the input shaft is rotatably fitted with the second housing, the input shaft penetrates through the motor shaft, one end of the input shaft is used for connecting with the blade shaft, and the other end of the input shaft is connected with the input end of the low-speed transmission unit; both the low-speed transmission unit and the high-speed transmission unit are installed in the second housing, the output end of the low-speed transmission unit is connected with the input end of the high-speed transmission unit, and the output end of the high-speed transmission unit is connected with the motor shaft; the high-speed transmission unit is located on the side of the low-speed transmission unit close to the blade shaft.

[0010] In an optional embodiment, the low-speed transmission unit includes a low-speed planet carrier, low-speed planet gears, a low-speed gear ring, and a low-speed transmission shaft. The input shaft passes through the low-speed planet carrier and is in transmission connection with it. The low-speed planet gears are rotatably installed on the low-speed planet carrier; the low-speed gear ring is installed in the second housing, and the low-speed planet gears are simultaneously meshed with the low-speed gear ring and the low-speed transmission shaft; the low-speed transmission shaft is sleeved outside the input shaft, and the low-speed transmission shaft is connected with the input end of the high-speed transmission unit.

[0011] Based on the above solution, after the input shaft is connected to the blade shaft, the blade shaft rotates under the action of wind force, driving the low-speed planet carrier to rotate. The rotation of the low-speed planet carrier drives the low-speed planet gears to rotate. The low-speed planet gears are connected with the low-speed gear ring and the low-speed transmission shaft. The low-speed planet gears perform self-rotation and revolution, driving the low-speed transmission shaft to rotate. The low-speed transmission shaft transmits the torque to the input end of the high-speed transmission unit. The low-speed transmission unit is immersed in the oil, with a low rotation speed and small oil stirring loss.

[0012] In an optional embodiment, the low-speed transmission unit further includes an internal spline sleeve. The internal spline sleeve is sleeved outside the input shaft, meshes with the input shaft, and is fixedly connected with the low-speed planet carrier.

[0013] Based on the above solution, by setting the internal spline sleeve, the input shaft can directly pass through the low-speed planet carrier, and the two can be in clearance fit. External splines can be provided at the end of the input shaft. The external splines mesh with the internal spline sleeve, and the internal spline sleeve is connected with the low-speed planet carrier. The input shaft transmits the torque to the internal spline sleeve, driving the low-speed planet carrier to rotate through the internal spline sleeve. The internal spline sleeve not only plays a role in torque transmission but also can stabilize the bottom end of the input shaft, reducing the use of bearings.

[0014] In an alternative embodiment, the high-speed transmission unit includes a high-speed planet carrier, a double planetary gear, a high-speed ring gear, and a high-speed sun gear. The high-speed planet carrier is sleeved outside the low-speed transmission shaft and is in transmission connection therewith. The double planetary gear is rotatably mounted on the high-speed planet carrier. The high-speed ring gear is fixed within the second housing. The high-speed sun gear is sleeved outside the input shaft and is connected to the motor shaft. The first gear of the double planetary gear meshes with the high-speed ring gear, and the second gear of the double planetary gear meshes with the high-speed sun gear. The second gear is located on the side of the first gear closer to the blade shaft.

[0015] Based on the above solution, the low-speed transmission shaft transmits torque to the high-speed planet carrier. The double planetary gear is mounted on the high-speed planet carrier. The design of the double planetary gear enables the first gear and the second gear to be arranged axially, and the two are not simultaneously clamped between the high-speed sun gear and the high-speed ring gear. The gear parameters of the first gear and the second gear can be set as required, and a larger speed ratio can be achieved, thereby providing a larger output torque while reducing the number of speed increase stages, reducing the axial dimension of the speed increase gearbox, making the overall structure more compact and facilitating installation. During torque transmission, the high-speed planet carrier rotates on its own axis, driving the first gear to revolve and the second gear to revolve. The second gear meshes with the high-speed ring gear and rotates on its own axis. The second gear also meshes with the high-speed sun gear at the same time, thereby transmitting torque to the high-speed sun gear.

[0016] In an alternative embodiment, the high-speed sun gear and the motor shaft are provided as an integral structure.

[0017] Based on the above solution, the overall structural strength of the high-speed sun gear and the motor shaft is high, and the service life is long.

[0018] In an alternative embodiment, the generator assembly further includes a first sealing assembly, which is installed between the first housing and the input shaft.

[0019] Based on the above solution, the first sealing assembly is a low-speed end sealing assembly, which can reduce the oil leakage between the first housing and the input shaft.

[0020] In an alternative embodiment, the speed increase gearbox further includes a snap ring, which is sleeved outside the input shaft and is located on the side of the first sealing assembly closer to the blade shaft. The orthographic projection of the first sealing assembly in the projection plane perpendicular to the input shaft falls within the area enclosed by the snap ring.

[0021] Based on the above solution, the design of the snap ring can prevent external impurities from reaching the position of the first sealing assembly, playing a role in protecting the first sealing assembly.

[0022] In an optional embodiment, the generator assembly further includes a second sealing assembly, which is installed between the first housing and the motor shaft, and the second sealing assembly is located on a side of the high-speed transmission unit close to the blade shaft.

[0023] Based on this solution, the second sealing assembly is the high-speed end seal. Because it is positioned higher, it is not completely immersed in the lubricating oil, resulting in low sealing pressure and a reduced probability of oil leakage. Furthermore, impurities in the oil are deposited at the bottom of the second housing and are unlikely to reach the second sealing assembly. This reduces the risk of wear and tear, resulting in a long service life.

[0024] In an optional embodiment, the first shell and the second shell are detachably connected via a flange structure.

[0025] Based on the above scheme, the two are easy to disassemble and assemble, and are convenient for maintenance and inspection.

[0026] In an optional embodiment, the second housing is configured as a split structure.

[0027] Based on the above solution, during assembly, the second housing is first placed in a separated state, which facilitates assembly of the low-speed transmission unit and the high-speed transmission unit inside the second housing.

[0028] The beneficial effects of the coaxial vertical wind power generation system provided by the embodiment of the utility model include:

[0029] To sum up, the coaxial vertical wind power generation system provided by this embodiment is configured to set the generator assembly above the speed-increasing gearbox. In this way, the position of the high-speed end of the speed-increasing gearbox is raised, and the high-speed end of the speed-increasing gearbox is not set at the bottom of the second shell. The sealing structure corresponding to the high-speed end will not be completely immersed or directly contact the lubricating oil, thereby reducing the sealing load of the sealing structure of the high-speed end. The sealing structure of the high-speed end is not prone to oil leakage. Moreover, the impurities carried in the lubricating oil are located below the second shell and are not easily in contact with the sealing structure corresponding to the high-speed shaft. The sealing structure is not easily worn and fails, and has a good sealing effect and a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 A schematic structural diagram of the coaxial vertical wind power generation system provided in this embodiment;

[0032] Figure 2 Schematic cross-sectional structure diagram of the coaxial vertical wind power generation system provided in this embodiment;

[0033] Figure 3 Schematic partial structure diagram of the coaxial vertical wind power generation system provided in this embodiment.

[0034] Icon:

[0035] 100 - Generator assembly; 110 - First housing; 111 - First central hole; 120 - Motor shaft; 130 - First sealing assembly; 140 - Second sealing assembly; 150 - First bearing; 160 - Second bearing; 170 - Third bearing; 180 - Fourth bearing; 200 - Speed increasing gearbox; 210 - Second housing; 220 - Input shaft; 230 - Low-speed transmission unit; 231 - Low-speed planet carrier; 232 - Low-speed planet gear; 233 - Low-speed gear ring; 234 - Low-speed transmission shaft; 235 - Internal spline sleeve; 240 - High-speed transmission unit; 241 - High-speed planet carrier; 242 - Double planetary gear; 2421 - First gear; 2422 - Second gear; 243 - High-speed gear ring; 244 - High-speed sun gear; 250 - Fifth bearing; 260 - Sixth bearing; 270 - Retaining ring. Detailed implementation manners

[0036] In the prior art, the speed increaser of the vertical wind turbine is located above the generator. The high-speed end of the speed increaser is connected to the generator to achieve torque input. The high-speed end of the speed increaser is located at the bottom of the speed increaser housing. In order to achieve effective lubrication of the speed increaser, a certain amount of lubricating oil is stored in the speed increaser housing. The sealing assembly corresponding to the high-speed end is completely immersed in the lubricating oil, resulting in oil leakage. Moreover, the impurities in the lubricating oil have a high contact frequency with the sealing assembly under the action of oil agitation, and the sealing assembly is prone to wear and failure, with a short service life.

[0037] In view of this, the designer provides a coaxial vertical wind power generation system, in which the generator is arranged above the speed increasing gearbox 200. The position of the high-speed end of the speed increasing gearbox 200 is raised, and it is not completely or not immersed in the lubricating oil. The sealing load is small, the pressure of the lubricating oil acting on the sealing assembly at the high-speed end is small, the oil leakage is less, and the sealing assembly is not prone to wear and failure, with a long service life.

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0039] Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0040] It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

[0041] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is customarily placed during use, 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 of the present invention.

[0042] In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0043] It should be noted that the features in the embodiments of the present invention may be combined with each other without conflict.

[0044] Please refer to Figures 1 - 3 , in this embodiment, the coaxial vertical wind power generation system includes a generator assembly 100 and a speed increasing gearbox 200. The generator assembly 100 includes a first housing 110 and a motor shaft 120, and the motor shaft 120 is rotatably mounted in the first housing 110. The speed increasing gearbox 200 includes a second housing 210, an input shaft 220, a low-speed transmission unit 230 and a high-speed transmission unit 240. The first housing 110 is connected to the second housing 210. The input shaft 220 is rotatably engaged with the second housing 210, the input shaft 220 passes through the motor shaft 120, one end of the input shaft 220 is used for connecting with a blade shaft, and the other end of the input shaft 220 is connected to the input end of the low-speed transmission unit 230; both the low-speed transmission unit 230 and the high-speed transmission unit 240 are mounted in the second housing 210, the output end of the low-speed transmission unit 230 is connected to the input end of the high-speed transmission unit 240, and the output end of the high-speed transmission unit 240 is connected to the motor shaft 120. The high-speed transmission unit 240 is located on the side of the low-speed transmission unit 230 close to the blade shaft.

[0045] As described above, the working process of the coaxial vertical wind power generation system provided in this embodiment is as follows:

[0046] The wind turbine's blade shaft is connected to the input shaft 220. The power generation system can be placed on the ground or on another supporting structure. The first housing is located above the second housing, meaning that the generator assembly 100 is located above the speed-increasing gearbox 200. The input shaft 220 and the blade shaft are coaxial and both arranged vertically. Under the action of wind, the blade shaft rotates, driving the input shaft 220 to rotate, thereby transmitting torque to the low-speed transmission unit 230. The low-speed transmission unit 230 then transmits the torque to the high-speed transmission unit 240. The high-speed transmission unit 240 ultimately transmits the torque to the motor shaft 120 of the generator assembly 100, thereby generating electricity using wind power.

[0047] It should be understood that by setting the generator assembly 100 above the speed-increasing gearbox 200, the position of the high-speed end of the speed-increasing gearbox 200 is raised, and the high-speed end of the speed-increasing gearbox 200 is not set at the bottom of the second shell. The sealing structure corresponding to the high-speed end will not be completely immersed or directly contact the lubricating oil, which reduces the sealing load of the sealing structure of the high-speed end. The sealing structure of the high-speed end is not prone to oil leakage. In addition, the impurities carried in the lubricating oil are located below the second shell and are not easy to contact the sealing structure corresponding to the high-speed shaft. The sealing structure is not easy to wear and fail, and the sealing effect is good and the service life is long.

[0048] The details of the coaxial vertical wind power generation system provided in the embodiment of the present application are described below by way of examples.

[0049] Please combine Figure 1 In this embodiment, the coaxial vertical wind power generation system includes a wind turbine assembly (not shown), a generator assembly 100, and a speed-increasing gearbox 200. The wind turbine assembly is connected to the generator assembly 100 via the speed-increasing gearbox 200, with the wind turbine assembly located above and the speed-increasing gearbox 200 located below. The generator assembly 100 is located between the wind turbine assembly and the speed-increasing gearbox 200. In this way, the wind turbine assembly transmits torque to the speed-increasing gearbox 200 under the action of wind. The torque is then adjusted and output to the generator assembly 100, which then generates electricity.

[0050] Please combine Figure 2, in this embodiment, optionally, the generator assembly 100 includes a first housing 110, a motor shaft 120, a first sealing assembly 130, a second sealing assembly 140, a first bearing 150, a second bearing 160, a third bearing 170, and a fourth bearing 180. The first housing 110 is provided with a first central hole 111. The first bearing 150, the second bearing 160, the third bearing 170, and the fourth bearing 180 are sequentially arranged in the first central hole 111 from top to bottom, and the first bearing 150, the second bearing 160, the third bearing 170, and the fourth bearing 180 are coaxially arranged. The motor shaft 120 is provided as a hollow shaft, and the motor shaft 120 is rotatably installed in the first central hole 111. The motor shaft 120 is connected to both the second bearing 160 and the third bearing 170 and extends out of the first housing 110 from the side where the first bearing 150 is located. The first sealing assembly 130 is installed in the first central hole 111, and the first sealing assembly 130 is located on the side of the first bearing 150 away from the second bearing 160. The second sealing assembly 140 is installed in the central hole, and the second sealing assembly 140 is located between the third bearing 170 and the fourth bearing 180.

[0051] Optionally, both the first sealing assembly 130 and the second sealing assembly 140 can be rubber seals or skeleton oil seals, etc.

[0052] Please combine Figure 2 and Figure 3 , in this embodiment, optionally, the speed increasing gearbox 200 includes a second housing 210, an input shaft 220, a low-speed transmission unit 230, a high-speed transmission unit 240, and a fifth bearing 250. The first housing 110 can be detachably connected to the second housing 210 through a flange structure. During actual use, the first housing 110 is located above the second housing 210, that is, the generator assembly 100 is located above the speed increasing gearbox 200. The second housing 210 is provided with a second central hole, and the first central hole 111 and the second central hole are coaxial and communicate with each other. The input shaft 220 is simultaneously disposed in the middle shell area of the first central hole 111, the second central hole, and the motor shaft 120. The input shaft 220 is rotatably matched with the second housing 210, and one end of the input shaft 220 extends out of the first central hole 111. The end of the input shaft 220 extending out of the first central hole 111 is used to connect to the blade shaft. The other end of the input shaft 220 is connected to the input end of the low-speed transmission unit 230. Both the low-speed transmission unit 230 and the high-speed transmission unit 240 are installed in the second housing 210. The output end of the low-speed transmission unit 230 is connected to the input end of the high-speed transmission unit 240, and the output end of the high-speed transmission unit 240 is connected to the motor shaft 120. The high-speed transmission unit 240 is located on the side of the low-speed transmission unit 230 close to the blade shaft.

[0053] Optionally, the second housing 210 can be configured as a split structure for easy disassembly and assembly. For example, the second housing 210 includes an upper half shell and a lower half shell, and the upper half shell and the lower half shell can be detachably connected by bolts. The upper half shell is connected to the bottom of the first housing 110 through a flange structure. A fifth bearing 250 is installed in the lower half shell.

[0054] Optionally, the low-speed transmission unit 230 includes a low-speed planet carrier 231, low-speed planet gears 232, a low-speed gear ring 233, a low-speed transmission shaft 234, and an internal spline sleeve 235. The bottom of the low-speed planet carrier 231 is fixedly connected to the internal spline sleeve 235 through structural members such as bolts. The outer side of the internal spline sleeve 235 is fitted with the inner ring of the fifth bearing 250, and the internal spline sleeve 235 is rotatably connected to the lower half shell. The input shaft 220 passes through the low-speed planet carrier 231 and the two are rotatably connected. The bottom of the input shaft 220 meshes with the internal spline sleeve 235, and the top of the input shaft 220 is connected to the inner ring of the first bearing 150. The low-speed planet gears 232 are rotatably installed on the low-speed planet carrier 231. The number of low-speed planet gears 232 is set as required, and multiple low-speed planet gears 232 can be evenly spaced around the rotation axis of the low-speed planet carrier 231. The low-speed gear ring 233 is installed inside the lower half shell, and the low-speed planet gears 232 mesh with both the low-speed gear ring 233 and the low-speed transmission shaft 234 at the same time. The low-speed transmission shaft 234 is sleeved outside the input shaft 220, and the low-speed transmission shaft 234 is rotatably connected to the input shaft 220. The low-speed transmission shaft 234 is connected to the input end of the high-speed transmission unit 240.

[0055] It should be understood that the low-speed transmission shaft 234 can be configured as an external spline shaft.

[0056] Optionally, the high-speed transmission unit 240 includes a high-speed planet carrier 241, a double planet gear 242, a high-speed gear ring 243, and a high-speed sun gear 244. The high-speed planet carrier 241 is sleeved outside the low-speed transmission shaft 234 and the two are in transmission connection. The high-speed planet carrier 241 is rotatably fitted with the low-speed planet carrier 231 through a sixth bearing 260. At the same time, the high-speed planet carrier 241 is also fitted with the inner ring of the fourth bearing 180. The high-speed planet carrier 241 is supported by both the fourth bearing 180 and the sixth bearing 260, and the stability of the high-speed planet carrier 241 is high. The double planet gear 242 is rotatably installed on the high-speed planet carrier 241. The number of double planet gears 242 is set as required and is not specifically limited in this embodiment. The high-speed gear ring 243 is fixed inside the upper half shell. The high-speed sun gear 244 is sleeved outside the input shaft 220 and is connected to the motor shaft 120. The first gear 2421 of the double planet gear 242 meshes with the high-speed gear ring 243, and the second gear 2422 of the double planet gear 242 meshes with the high-speed sun gear 244. The second gear 2422 is located on the side of the first gear 2421 closer to the blade shaft.

[0057] It should be understood that the high-speed sun gear 244 and the motor shaft 120 can be set as an integral structure, with high structural strength and long service life. In other embodiments, the high-speed sun gear 244 and the motor shaft 120 can be fixed by welding or fixed by structural members such as bolts, as long as torque transmission can be achieved.

[0058] As described above, the specific working mode of the coaxial vertical wind power generation system provided in this embodiment is as follows:

[0059] The blade shaft is connected to the input shaft 220 through structural members such as splines. The blade shaft rotates under the action of wind force, transmits torque to the input shaft 220, the input shaft 220 drives the internal spline sleeve 235 to rotate, thereby driving the low-speed planet carrier 231 to rotate. The low-speed planet gears 232 located on the low-speed planet carrier 231 rotate and revolve under the action of the low-speed gear ring 233. The self-rotation of the low-speed planet gears 232 drives the low-speed transmission shaft 234 to rotate. The low-speed transmission shaft 234 transmits torque to the high-speed planet carrier 241. Under the action of the high-speed gear ring 243, the double planetary gears 242 transmit torque to the high-speed sun gear 244, and the high-speed sun gear 244 transmits torque to the motor shaft 120, and the rotation of the motor shaft 120 realizes wind power generation. Since the high-speed sun gear 244 is located above the low-speed transmission unit 230, in this way, the position of the high-speed sun gear 244 is raised, and the position of the second sealing assembly 140 located above the high-speed sun gear 244 is even higher. The liquid level of the lubricating oil can be lower than the position where the second sealing assembly 140 is located, thereby avoiding the problem of lubricating oil leakage from the second sealing assembly 140, reducing the sealing load of the second sealing assembly 140, making the second sealing assembly 140 not easily fail, and having a long service life.

[0060] The speed increasing gearbox 200 is installed below the first housing 110. The speed increasing gearbox 200 can include the second housing 210, the input shaft 220, the low-speed transmission unit 230 and the high-speed transmission unit 240 of the blade. The first housing 110 and the second housing 210 are connected. The input shaft 220 is rotatably matched with the second housing 210. The input shaft 220 penetrates through the motor shaft 120. One end of the input shaft 220 is used to connect with the blade shaft, and the other end of the input shaft 220 is connected to the input end of the low-speed transmission unit 230; both the low-speed transmission unit 230 and the high-speed transmission unit 240 are installed in the second housing 210. The output end of the low-speed transmission unit 230 is connected to the input end of the high-speed transmission unit 240, and the output end of the high-speed transmission unit 240 is connected to the motor shaft 120. The high-speed transmission unit 240 is located on the side of the low-speed transmission unit 230 close to the blade shaft.

[0061] In other embodiments, optionally, the speed increasing gearbox 200 further includes a retaining ring 270 sleeved outside the input shaft 220. The retaining ring 270 is located on the side of the first sealing assembly 130 close to the blade shaft. The orthographic projection of the first sealing assembly 130 in the projection plane perpendicular to the input shaft 220 falls within the area enclosed by the retaining ring 270. For example, the retaining ring 270 can be fixed to the shaft section of the input shaft 220 extending out of the first housing 110 by screwing, which is convenient for installation. By providing the retaining ring 270, external impurities can be blocked from reaching the position of the first sealing assembly 130, playing a role in protecting the first sealing assembly 130.

[0062] In the coaxial vertical wind power generation system provided in this embodiment, the generator assembly 100 is located above the speed increasing gearbox 200, which can increase the height of the high-speed end of the high-speed transmission unit 240, that is, increase the height of the high-speed sun gear 244, thereby increasing the height of the second sealing assembly 140 for sealing the high-speed end. The second sealing assembly 140 is not easily immersed in the oil and is not easily worn out by impurities, so it has a long service life. At the same time, the high-speed transmission unit 240 adopts an NW planetary transmission structure, with a small axial dimension, a compact structure, and a small overall volume.

[0063] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention.

Claims

1. A coaxial vertical wind power generation system, characterized in that, Including: A generator assembly (100) and a speed increasing gearbox (200); the generator assembly (100) includes a first housing (110) and a motor shaft (120), and the motor shaft (120) is rotatably installed in the first housing (110); The speed increasing gearbox (200) includes a second housing (210), an input shaft (220), a low-speed transmission unit (230) and a high-speed transmission unit (240); the first housing (110) and the second housing (210) are connected; the input shaft (220) is rotatably fitted with the second housing (210), the input shaft (220) penetrates through the motor shaft (120), one end of the input shaft (220) is used for connecting with a blade shaft, and the other end of the input shaft (220) is connected with the input end of the low-speed transmission unit (230); both the low-speed transmission unit (230) and the high-speed transmission unit (240) are installed in the second housing (210), the output end of the low-speed transmission unit (230) is connected with the input end of the high-speed transmission unit (240), and the output end of the high-speed transmission unit (240) is connected with the motor shaft (120); the high-speed transmission unit (240) is located on the side of the low-speed transmission unit (230) close to the blade shaft.

2. The coaxial vertical wind power generation system according to claim 1, characterized in that: The low-speed transmission unit (230) includes a low-speed planet carrier (231), low-speed planet gears (232), a low-speed gear ring (233) and a low-speed transmission shaft (234), the input shaft (220) passes through the low-speed planet carrier (231) and the two are in transmission connection, and the low-speed planet gears (232) are rotatably installed on the low-speed planet carrier (231); the low-speed gear ring (233) is installed in the second housing (210), and the low-speed planet gears (232) are simultaneously meshed with the low-speed gear ring (233) and the low-speed transmission shaft (234); the low-speed transmission shaft (234) is sleeved outside the input shaft (220), and the low-speed transmission shaft (234) is connected with the input end of the high-speed transmission unit (240).

3. The coaxial vertical wind power generation system according to claim 2, characterized in that: The low-speed transmission unit (230) further includes an internal spline sleeve (235), the internal spline sleeve (235) is sleeved outside the input shaft (220), the internal spline sleeve (235) is meshed with the input shaft (220), and the internal spline sleeve (235) is fixedly connected with the low-speed planet carrier (231).

4. The coaxial vertical wind power generation system according to claim 2, characterized in that: The high-speed transmission unit (240) includes a high-speed planet carrier (241), a double planetary gear (242), a high-speed ring gear (243) and a high-speed sun gear (244). The high-speed planet carrier (241) is sleeved outside the low-speed transmission shaft (234) and the two are in transmission connection. The double planetary gear (242) is rotatably mounted on the high-speed planet carrier (241). The high-speed ring gear (243) is fixed inside the second housing (210). The high-speed sun gear (244) is sleeved outside the input shaft (220) and is connected to the motor shaft (120). The first gear (2421) of the double planetary gear (242) meshes with the high-speed ring gear (243), and the second gear (2422) of the double planetary gear (242) meshes with the high-speed sun gear (244). The second gear (2422) is located on the side of the first gear (2421) close to the blade shaft.

5. The coaxial vertical wind power generation system according to claim 4, characterized in that: The high-speed sun gear (244) and the motor shaft (120) are arranged as an integral structure.

6. The coaxial vertical wind power generation system according to claim 1, characterized in that: The generator assembly (100) further includes a first sealing assembly (130), and the first sealing assembly (130) is installed between the first housing (110) and the input shaft (220).

7. The coaxial vertical wind power generation system according to claim 6, characterized in that: The speed increasing gearbox (200) further includes a retaining ring (270), the retaining ring (270) is sleeved outside the input shaft (220), the retaining ring (270) is located on the side of the first sealing assembly (130) close to the blade shaft, and the orthographic projection of the first sealing assembly (130) in the projection plane perpendicular to the input shaft (220) falls within the area surrounded by the retaining ring (270).

8. The coaxial vertical wind power generation system according to claim 1, characterized in that: The generator assembly (100) further includes a second sealing assembly (140), the second sealing assembly (140) is installed between the first housing (110) and the motor shaft (120), and the second sealing assembly (140) is located on the side of the high-speed transmission unit (240) close to the blade shaft.

9. The coaxial vertical wind power generation system according to claim 1, characterized in that: The first housing (110) and the second housing (210) are detachably connected through a flange structure.

10. The coaxial vertical wind power generation system according to claim 1, characterized in that: The second housing (210) is arranged as a split structure.

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