Transmission system and wind turbine generator system

Abstract

The application relates to a transmission system and a wind turbine generator set, the transmission system comprising: a shafting structure comprising a movable shaft, a fixed shaft and a bearing set, the movable shaft being coaxially arranged with the fixed shaft and being rotationally connected through the bearing set; and a loading structure arranged at one end of the movable shaft in the axial direction of the movable shaft and being rotationally connected with the movable shaft, the loading structure being used for applying an acting force to the movable shaft, and the applying direction of the acting force intersecting with the axial direction. The transmission system and the wind turbine generator set provided by the embodiment of the application can transfer kinetic energy, guarantee the power generation demand of the wind turbine generator set, reduce the damage to the bearing set of the transmission system, and improve the service life of the whole transmission system.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wind power technology, in particular to a transmission system and a wind turbine generator. BACKGROUND

[0002] The wind turbine generator can convert the wind energy in nature into usable electric energy, and is widely used. The wind turbine generator mainly includes a direct drive wind turbine generator and a doubly-fed wind turbine generator. The direct drive wind turbine generator does not have a gear box, reduces transmission loss, improves power generation efficiency, and the effect is more significant especially in a low wind speed environment. Moreover, the direct drive wind turbine generator saves the gear box and its accessories, simplifies the transmission structure, improves the overall reliability of the wind turbine generator, and can effectively reduce the maintenance cost, so it is widely used in the field of wind power.

[0003] However, the existing direct drive wind turbine generator directly connects the impeller and the base of the nacelle through a transmission system. Since the impeller has a large weight and a load of wind energy, the weight and the load borne by the impeller will act on the bearing set inside the transmission system, which is not conducive to the load bearing of each bearing of the bearing set, especially the bearing close to the impeller, and affects the overall service life of the transmission system.

[0004] Therefore, the present application provides a transmission system and a wind turbine generator. SUMMARY

[0005] The present application provides a transmission system and a wind turbine generator. The transmission system can meet the kinetic energy transmission, ensure the power generation demand of the wind turbine generator, reduce the damage to its own bearing set, and improve the overall service life of the transmission system.

[0006] In one aspect, the present application provides a transmission system, which includes: a shafting structure including a driving shaft, a fixed shaft and a bearing set, the driving shaft and the fixed shaft are coaxially arranged and rotationally connected through the bearing set; a loading structure arranged at one end of the driving shaft in the axial direction and rotationally connected with the driving shaft, the loading structure is used for applying a force to the driving shaft, and the application direction of the force intersects with the axial direction.

[0007] According to one aspect of the present application, the loading structure can adjust the force applied to the driving shaft.

[0008] According to one aspect of the present application, the loading structure includes a connecting piece and a loading piece, the connecting piece is connected with the driving shaft and has a connecting part capable of rotating around the axis of the driving shaft as a center line, and the loading piece is connected with the connecting part and provides the force.

[0009] According to an aspect of the embodiment of the present application, the adapter comprises an adapter inner ring and an adapter outer ring in a rotary fit, the adapter inner ring is connected to the dynamic shaft, and the adapter outer ring forms a connecting part and is hingedly connected to the loading component.

[0010] According to an aspect of the embodiment of the present application, the adapter further comprises an extension part extending in the axial direction by a predetermined length, the adapter inner ring is arranged on the side of the extension part away from the dynamic shaft, and the adapter inner ring is connected to the dynamic shaft through the extension part.

[0011] According to an aspect of the embodiment of the present application, the loading component comprises a telescopic cylinder and a first driver, one of the cylinder body and the cylinder rod of the telescopic cylinder is connected to the adapter, the other of the cylinder body and the cylinder rod is used to be connected to an external component, and the first driver is configured to adjust the telescopic amount of the telescopic cylinder.

[0012] According to an aspect of the embodiment of the present application, the loading component comprises a loading container and a second driver, the loading container has a containing cavity, and the second driver is configured to adjust the volume of the liquid contained in the containing cavity.

[0013] According to an aspect of the embodiment of the present application, the bearing set comprises a first bearing and a second bearing, and the first bearing and the second bearing are distributed in the axial direction.

[0014] On the other hand, the embodiment of the present application provides a wind turbine generator set, which comprises: a nacelle comprising a base; the transmission system described above, which is fixedly connected to the base, and the loading structure is arranged at least on the base; a generator comprising a rotor and a stator, the rotor being connected to the dynamic shaft, and the stator being connected to the fixed shaft; and a blade wheel connected to the end of the dynamic shaft away from the loading structure.

[0015] According to another aspect of the embodiment of the present application, the wind turbine generator set further comprises a detector and a controller, the detector is configured to detect the load information borne by the blade wheel, and the controller is configured to control the loading structure to apply a predetermined value of force to the dynamic shaft according to the load information.

[0016] According to another aspect of the embodiment of the present application, the loading structure is at least partially hinged to the base.

[0017] The transmission system and the wind turbine generator set provided by the embodiment of the present application, the transmission system comprises a shafting structure and a loading structure, the rotor and the stator of the generator can be connected through the shafting structure, and the blade wheel and the base of the nacelle can be connected, so that the power generation demand is ensured. Moreover, the corresponding loading structure can apply a force to the dynamic shaft in a direction intersecting with the axial direction of the dynamic shaft, so as to balance the weight and the load borne by the blade wheel, reduce the damage to the bearing set in the shafting structure, and improve the service life of the bearing set and the transmission system as a whole. BRIEF DESCRIPTION OF DRAWINGS

[0018] Features, advantages, and technical and artistic effects of exemplary embodiments of this application will be described below in reference to a drawing.

[0019] Figure 1 is a schematic diagram of the overall structure of a wind turbine generator set according to an embodiment of the present application;

[0020] Figure 2 is a schematic diagram of the partial structure of a wind turbine generator set according to an embodiment of the present application;

[0021] Figure 3 is a schematic diagram of the structure of a drive system according to an embodiment of the present application;

[0022] Figure 4 is a schematic diagram of the structure of a drive system according to another embodiment of the present application;

[0023] Figure 5 is a control flowchart of a wind turbine generator set according to an embodiment of the present application.

[0024] 1 - drive system; 10 - shaft structure; 11 - moving shaft; 12 - fixed shaft; 13 - bearing set; 131 - first bearing; 132 - second bearing; 20 - loading structure; 21 - adapter; 211 - adapter bearing; 211a - adapter inner ring; 211b - adapter outer ring; 212 - extension; 22 - loading member; 221 - telescopic cylinder; 222 - first driver; 223 - loading container; 224 - second driver; 224a - driving pump; 224b - spare accommodation box;

[0025] 2 - nacelle; 201 - base; 202 - support frame; 3 - generator; 301 - rotor; 302 - stator; 4 - impeller; 401 - hub; 402 - blade; 5 - tower; 6 - detector; 7 - controller.

[0026] In the drawings, the same components have the same reference numerals. The drawings are not drawn to scale. DETAILED DESCRIPTION

[0027] Features and exemplary embodiments of various aspects of the present application will be described below in detail. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without some or all of these specific details. In other instances, well known structures and functions have not been described in detail in order to avoid obscuring the application. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present application. Particular embodiments described in this detailed description are included to provide a more thorough understanding of the present application and as a basis for the claims. However, one skilled in the art will appreciate that the present application can be practiced without one or more of the specific details or with other methods, components, materials, and so forth. In other instances, well-known structures and functions are not shown or described in order to avoid obscuring the present application.

[0028] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the transmission system and wind turbine generator set of the present invention. It should also be noted in the description of the present invention that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0029] To better understand this invention, the following is combined with... Figures 1 to 5 The transmission system 1 and the wind turbine generator set according to embodiments of the present invention will be described in detail.

[0030] Please see Figure 1 as well as Figure 2 This invention provides a wind turbine generator set, including a tower 5, a nacelle 2, a generator 3, a shaft system 10, and an impeller 4. The tower 5 is connected to a wind turbine foundation, and the nacelle 2 is disposed at the top of the tower 5. The nacelle 2 includes a base 201, and the nacelle 2 can be connected to the tower 5 and the shaft system 10 through the base 201. The generator 3 is disposed in the nacelle 2; in some examples, the generator 3 may be located outside the nacelle 2. The impeller 4 includes a hub 401 and a plurality of blades 402 connected to the hub 401. The generator 3 includes a rotor 301 and a stator 302 that are rotatably coupled. The rotor 301 can be connected to the hub 401 through the shaft system 10, and the stator 302 can be connected to the base 201 of the nacelle 2 through the shaft system 10. When wind force acts on the blade 402, the blade 402 drives the hub 401 to rotate. The hub 401 drives the rotor 301 of the generator 3 to rotate relative to the stator 302 through the shaft structure 10, thereby meeting the power generation needs of the wind turbine generator set.

[0031] The wind turbine generator set provided in this embodiment of the invention can be a direct-drive wind turbine generator set. In existing direct-drive wind turbine generator sets, the rotor 4 and the nacelle 2 are directly connected through the transmission system 1. Since the rotor 4 has a large weight and the load of wind energy, its weight and the load it bears will act on the bearing assembly 13 inside the transmission system 1. This will have an adverse effect on the bearings of the bearing assembly 13, especially the bearings on the side closer to the rotor 4, and will affect the overall lifespan of the transmission system 1.

[0032] Based on the above-mentioned technical problems, the present invention provides a new transmission system that can be manufactured and used as an independent component, and can also be used in the wind turbine generator set provided in the above embodiments as a component of the wind turbine generator set.

[0033] like Figure 2 as well asFigure 3 As shown, the transmission system 1 provided by the embodiment of the present application comprises a shafting structure 10 and a loading structure 20, the shafting structure 10 comprises a driving shaft 11, a fixed shaft 12 and a bearing set 13, the driving shaft 11 and the fixed shaft 12 are coaxially arranged and rotationally connected through the bearing set 13. The loading structure 20 is arranged at one end of the driving shaft 11 in the axial direction of the driving shaft 11 and rotationally connected with the driving shaft 11, and the loading structure 20 is used for applying an acting force to the driving shaft 11, and the applying direction of the acting force intersects with the axial direction.

[0034] The transmission system 1 provided by the embodiment of the present application, when used in a wind turbine generator set, can connect the driving shaft 11 with the rotor 301 of the generator 3 and the hub 401, and connect the fixed shaft 12 with the stator 302 of the generator 3 and the base 201 of the nacelle 2, so that when the impeller 4 rotates under the action of wind energy, the driving shaft 11 can be driven to rotate relative to the fixed shaft 12, and then the relative rotation between the rotor 301 and the stator 302 is realized, and the conversion from wind energy to electric energy is realized. Moreover, the shafting structure 10 provided by the embodiment of the present application further comprises the loading structure 20, and the loading structure 20 is used for applying an acting force to the driving shaft 11, and the acting force intersects with the axial direction of the driving shaft 11, so as to balance the gravity of the impeller 4 and the load borne by the impeller 4, reduce or avoid the damage of the weight of the impeller 4 and the load borne by the impeller 4 to the bearing set 13 in the shafting structure 10, improve the service life of the bearing set 13 and the whole transmission system 1, and then ensure the power generation benefit of the wind turbine generator set.

[0035] As an optional implementation, the driving shaft 11 of the shafting structure 10 provided by the embodiment of the present application can be located inside the fixed shaft 12 and coaxially arranged with the fixed shaft 12. Optionally, the bearing set 13 comprises a first bearing 131 and a second bearing 132, the first bearing 131 and the second bearing 132 are spaced apart in the axial direction of the fixed shaft 12, the first bearing 131 and the second bearing 132 are both sleeved on the outer peripheral surface of the driving shaft 11 and located between the driving shaft 11 and the fixed shaft 12, and the driving shaft 11 and the fixed shaft 12 are rotationally connected with each other through the first bearing 131 and the second bearing 132. Optionally, the first bearing 131 can be located on the side away from the loading structure 20, and the second bearing 132 can be located on the side close to the loading structure 20, that is, when used in a wind turbine generator set, the first bearing 131 is arranged closer to the impeller 4.

[0036] In some optional embodiments, the shafting structure 10 provided by the embodiment of the present application, the acting force applied by the loading structure 20 to the driving shaft 11 is adjustable. By making the acting force applied by the loading structure 20 to the driving shaft 11 adjustable, the appropriate size of the acting force applied to the driving shaft 11 can be selected according to the weight of the impeller 4 and the different loads borne by the impeller 4, so as to reasonably balance the weight of the impeller 4 and the load borne by the impeller 4.

[0037] As an optional implementation, the shafting structure 10 provided by the embodiment of the present application, the action force applied to the dynamic shaft 11 by the loading structure 20 can be a thrust force, of course, can also be a pulling force, which can be determined according to the position of the loading structure 20.

[0038] In some optional embodiments, the loading structure 20 comprises an adapter 21 and a loading piece 22, the adapter 21 is connected with the dynamic shaft 11 and has a connecting part capable of rotating with the axis of the dynamic shaft 11 as the center line, and the loading piece 22 is connected with the connecting part and provides the action force. Since the shafting structure 10 is used for a wind turbine generator set, the dynamic shaft 11 rotates with the impeller 4, by making the loading structure 20 comprise the adapter 21 and making the adapter 21 have the connecting part capable of rotating with the axis of the dynamic shaft 11 as the center line, when the loading piece 22 applies the action to the dynamic shaft 11, the dynamic shaft 11 can rotate normally and will not affect the operation of the dynamic shaft 11, which ensures the transmission requirement of the dynamic shaft 11 to the kinetic energy of the impeller 4.

[0039] As an optional implementation, the shafting structure 10 provided by the embodiment of the present application, the adapter 21 can comprise a rotatingly matched adapter inner ring 211a and an adapter outer ring 211b, the adapter inner ring 211a is connected with the dynamic shaft 11, and the adapter outer ring 211b forms the connecting part and is hingedly connected with the loading piece 22. The adapter 21 adopts the above-mentioned form, has a simple structure and can meet the loading requirement of the loading piece 22 to the dynamic shaft 11. Moreover, the hingedly connecting the loading piece 22 with the adapter outer ring 211b can adjust the loading direction of the loading piece 22, so that the direction of the force applied by the loading piece 22 can be perpendicular to the axis of the shafting structure 10, which optimizes the force applying effect of the loading piece 22.

[0040] In some optional embodiments, a protruding part can be arranged on the adapter outer ring 211b, and a hinge hole is arranged on the protruding part, so that the loading piece 22 can be hingedly connected with the protruding part through a pin shaft.

[0041] In some optional embodiments, the adapter 21 can comprise an adapter bearing 211 coaxially arranged with the first bearing 131 and the second bearing 132, the adapter bearing 211 comprises the above-mentioned adapter inner ring 211a and the adapter outer ring 211b, meets the connection relationship between the dynamic shaft 11 and the loading piece 22, and is easy to purchase, maintain and replace.

[0042] As an optional implementation, the shafting structure 10 provided by the embodiment of the present application, the adapter 21 further comprises an extension 212 extending along the axial direction of the rotating shaft 11 by a predetermined length, and the adapter inner ring 211a is arranged on the side of the extension 212 away from the rotating shaft 11, and the adapter inner ring 211a is connected with the rotating shaft 11 through the extension 212. By arranging the extension 212, the shafting structure 10 provided by the embodiment of the present application can lengthen the force arm of the loading member 22 acting on the first bearing 131 and the second bearing 132 of the bearing set 13, and optimize the loading effect of the loading member 22.

[0043] In some optional embodiments, the extension 212 can be a cylindrical structure with a predetermined length, and the extension 212 and the rotating shaft 11 are coaxially arranged with each other. One end of the extension 212 is connected with the rotating shaft 11, and the end away from the rotating shaft 11 can be arranged in a cantilever manner and used for mounting the adapter bearing 211.

[0044] In some optional embodiments, the adapter inner ring 211a and the extension 212 can be an integrated structure, which can ensure the connection strength between the adapter 21 and the extension 212 and reliably ensure the coaxiality between the two and the rotating shaft 11.

[0045] As an optional implementation, the loading structure 20 and the shafting structure 10 are detachably connected with each other. This facilitates the maintenance and replacement of the loading structure 20. Optionally, the extension 212 of the loading structure 20 and the rotating shaft 11 can be detachably connected through fasteners.

[0046] In some optional embodiments, the loading member 22 comprises a telescopic cylinder 221 and a first driver 222. One of the cylinder body and the cylinder rod of the telescopic cylinder 221 is connected with the adapter 21, and the other one is used for being connected with an external member. The first driver 222 is configured to adjust the telescopic amount of the telescopic cylinder 221. The loading member 22 adopts the form of the telescopic cylinder 221, which is easy to control and can meet the force requirement of the shafting structure 10.

[0047] In some optional embodiments, the cylinder rod of the telescopic cylinder 221 can be connected with the adapter 21 and can be optionally hinged with each other. The cylinder body of the telescopic cylinder 221 can be connected with an external member other than the transmission system 1, for example, can be connected with the base 201 of the cabin 2.

[0048] As an optional implementation, the first driver 222 comprises a hydraulic station, the hydraulic station is connected with the telescopic cylinder 221 through pipelines, and the telescopic amount of the telescopic cylinder 221 is adjusted by using the hydraulic station to control the oil distribution in the rod cavity and the rodless cavity of the telescopic cylinder 221, so as to adjust the force applied to the rotating shaft 11.

[0049] It is understood that the use of a telescopic cylinder 221 and a first actuator 222 as the loading element 22 is only one optional implementation. Figure 4 As shown, in some embodiments, the loading member 22 may also include a loading container 223 and a second actuator 224. The loading container 223 has a receiving cavity, and the second actuator 224 is configured to adjust the volume of the liquid contained in the receiving cavity. Adjusting the volume of the liquid in the receiving cavity by the second actuator 224 can also adjust the force provided by the loading member 22 to the moving shaft 11. The second actuator 224 may be included to meet the load adjustment requirements.

[0050] Optionally, the loading container 223 can be hinged to the adapter 21, and the hinge method is the same as in the above embodiment, which will not be repeated here.

[0051] As an optional implementation, the second driver 224 may include a drive pump 224a and a spare container 224b. The spare container 224b is used to hold liquid. The drive pump 224a is used to adjust the ratio of liquid in the loading container 223 and the spare container 224b to adjust the liquid volume in the loading container 223, thereby satisfying the adjustment of the force applied by the loading member 22.

[0052] The transmission system 1 provided in this embodiment of the invention, when used in a wind turbine generator set, allows the loading structure 20 to be integrally installed inside the base 201 of the nacelle 2. At least a portion of the loading structure 20 can be connected to the base 201. The rotor 301 and stator 302 of the generator 3 can be connected via the shaft system 10, and the impeller 4 can be connected to the base 201 of the nacelle 2, ensuring power generation requirements. Furthermore, the correspondingly installed loading structure 20 can apply a force to the moving shaft 11 in a direction intersecting with the axial direction of the moving shaft 11, balancing the weight of the impeller 4 and the load it bears, reducing damage to the bearing assembly 13 within the shaft system 10, and improving the service life of the bearing assembly 13 and the transmission system 1 as a whole.

[0053] In some alternative embodiments, the loading structure 20 can be hinged to the base 201 of the cabin 2. Alternatively, the loading member 22 can be hinged to the base 201 of the cabin 2 to ensure that the loading direction of the loading member 22 can be adjusted so that it can be perpendicular or nearly perpendicular to the axis of the moving shaft 11, thereby optimizing the loading effect.

[0054] like Figures 2 to 4 As shown, as an optional implementation, the wind turbine generator set provided by the present invention may further include a support frame 202, which is disposed on and connected to the base 201, and the loading structure 20 is indirectly connected to the base 201 through the support frame 202.

[0055] As an optional implementation, the wind turbine provided by the embodiment of the present application further comprises a detector 6 configured to detect load information borne by the impeller 4, and a controller 7 configured to control the loading structure 20 to apply a predetermined value of force to the rotating shaft 11 according to the load information. By setting the detector 6 and the controller 7, the loading time and the value of the force applied by the loading structure 20 can be better controlled, and the service life of the bearing set 13 can be improved.

[0056] As shown in Figure 5 As an optional implementation, the controller 7 can be further configured to control the loading device to provide an initial force to the rotating shaft 11 according to the wind field test wind parameter, and to calculate an initial service life of the first bearing 131 and the second bearing 132 when the initial force has the loading value Fc.

[0057] Optionally, the controller 7 is configured to receive the load information of the impeller 4 detected by the detector 6, the load information including the bending moment My of the blade root in the Y direction (vertical direction), the force Fx in the X direction (horizontal direction), and the force Fz in the Z direction (axial direction of the shafting structure 10), and to obtain the bending moment My of the hub 401 center in the Y direction (vertical direction), the force Fx in the X direction (horizontal direction), and the force Fz in the Z direction (axial direction of the shafting structure 10) according to the load information, to obtain the load F1r borne by the first bearing 131 and the load F2r borne by the second bearing 132 according to the My, Fz, Fx of the hub 401 center, the distance L1 between the support point of the first bearing 131 and the hub 401 center, the distance L2 between the support point of the first bearing 131 and the support point of the second bearing 132, the distance L3 between the second bearing 132 and the loading point of the loading structure 20, and the loading value Fc of the initial force.

[0058] Optionally, the load F1r borne by the first bearing 131 can be obtained according to formula (1).

[0059]

[0060] Optionally, the load F2r borne by the second bearing 132 can be obtained according to formula (2).

[0061]

[0062] Optionally, the controller 7 is configured to obtain the actual service life of the first bearing 131 when the initial loading value is Fc according to the load F1r borne by the first bearing 131, and to adjust the force applied by the loading structure 20 to the rotating shaft 11 until the actual service life of the first bearing 131 is within a preset threshold range if the actual service life is less than the initial service life.

[0063] Optionally, the controller 7 is further configured to obtain the actual service life of the second bearing 132 at the initial loading value Fc of the loading force according to the load F2r borne by the second bearing 132, and adjust the loading force applied to the rotating shaft 11 by the loading structure 20 until the actual service life of the second bearing 132 is within the preset threshold range if the actual service life is less than the preset threshold.

[0064] Optionally, the controller 7 is configured to obtain the actual service life of the first bearing 131 at the initial loading value Fc according to the load F1r borne by the first bearing 131 and the bearing service life calculation formula L10. Optionally, the controller 7 is configured to obtain the actual service life of the second bearing 132 at the initial loading value Fc according to the load F2r borne by the second bearing 132 and the bearing service life calculation formula L10.

[0065] Optionally, when adjusting the load of the loading structure 20, the value of the loading force can be increased or decreased according to a preset gradient, and the actual service life of the corresponding bearing is compared with the preset service life after each loading until the actual service life is not less than the preset service life to stop the loading adjustment.

[0066] The wind turbine provided by the embodiments of the present application can balance the weight of the impeller 4 borne by the rotating shaft 11 and the wind load borne by the impeller 4 by applying the load to the rotating shaft 11 through the loading structure 20, thereby improving the service life of each bearing of the bearing set 13 and improving the safety performance and power generation efficiency of the wind turbine.

[0067] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the present application and equivalent components can be substituted therefor. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A transmission system (1) characterized in that, The application relates to a transmission system (1) comprising: a shaft structure (10) comprising a movable shaft (11) for connecting with a hub of an impeller (4), a fixed shaft (12) coaxially arranged with the movable shaft (11) and rotationally connected with the movable shaft (11) through a bearing set (13); a loading structure (20) arranged at one end of the movable shaft (11) in an axial direction of the movable shaft (11) and rotationally connected with the movable shaft (11), the loading structure (20) being used for applying an action force to the movable shaft (11), the action force being applied in a direction intersecting the axial direction to balance a gravity of the impeller (4) and a load borne.

2. The transmission system (1) according to claim 1, characterized in that The action force applied by the loading structure (20) to the movable shaft (11) is adjustable.

3. The transmission system (1) according to claim 1, characterized in that The loading structure (20) comprises a connecting piece (21) connected with the movable shaft (11) and having a connecting part capable of rotating with the axis of the movable shaft (11) as a center line, and a loading piece (22) connected with the connecting part and providing the action force.

4. A transmission system (1) according to claim 3, characterized in that The connecting piece (21) comprises a connecting inner ring (211a) connected with the movable shaft (11) and a connecting outer ring (211b) forming the connecting part and being hingedly connected with the loading piece (22).

5. A transmission system (1) according to claim 4, characterized in that The connecting piece (21) further comprises an extension part (212) extending in the axial direction by a predetermined length, the connecting inner ring (211a) being arranged at a side of the extension part (212) away from the movable shaft (11) and the connecting inner ring (211a) being connected with the movable shaft (11) through the extension part (212).

6. A transmission system (1) according to claim 3, characterized in that The loading piece (22) comprises a telescopic cylinder (221) and a first driver (222), one of a cylinder body and a cylinder rod of the telescopic cylinder (221) being connected with the connecting piece (21), the other of the cylinder body and the cylinder rod being used for connecting with an external member, and the first driver (222) being configured to adjust a telescopic amount of the telescopic cylinder (221).

7. A transmission system (1) according to claim 3, characterized in that The loading piece (22) comprises a loading container (223) having a containing cavity and a second driver (224) configured to adjust a volume of a liquid contained in the containing cavity.

8. The transmission system (1) according to claim 1, characterized in that The bearing set (13) comprises a first bearing (131) and a second bearing (132), the first bearing (131) and the second bearing (132) being spaced apart in the axial direction.

9. A wind power unit, characterized in that The application relates to a transmission system (1) comprising: a cabin (2) comprising a base (201); the transmission system (1) according to any one of claims 1 to 8, the fixed shaft (12) being connected to the base (201), and the loading structure (20) being at least partially arranged in the base (201); a generator (3) comprising a rotor (301) connected to the movable shaft (11) and a stator (302) connected to the fixed shaft (12). A impeller (4) is connected to one end of the dynamic shaft (11) away from the loading structure (20).

10. The wind power plant according to claim 9, characterized in that The wind turbine further comprises a detector (6) configured to detect load information borne by the impeller (4), and a controller (7) configured to control the loading structure (20) to apply the predetermined value of the acting force to the dynamic shaft (11) according to the load information.

11. The wind power plant according to claim 9, characterized in that The loading structure (20) is at least partially hinged with the base (201).

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