Wind turbine generator system

Abstract

This application relates to a wind turbine generator set, comprising: a gearbox including an input shaft, an output shaft, and a gear train connected between the input shaft and the output shaft; a generator including a rotor and a stator rotatably coupled, the rotor being connected to the output shaft; a lead-in pipe, at least partially disposed within the gearbox and the generator, one axial end of the lead-in pipe being connected to the input shaft, and the other end of the lead-in pipe extending into the output shaft and rotatably coupled to the output shaft; and a conductive element connected to the lead-in pipe and abutting against the rotor, so that the shaft voltage on the rotor is guided to a grounding point through the lead-in pipe. This application can both ensure the suppression of shaft voltage and reduce the wear of the conductive element, increase the service life of the conductive element, and reduce the maintenance cost of the wind turbine generator set.

Description

Technical Field

[0001] This application relates to the field of wind power technology, and in particular to a wind turbine generator set. Background Technology

[0002] During operation, wind turbine generators exhibit numerous stray current paths with frequency doubling characteristics of the inverter's switching frequency due to capacitive and conductive coupling. These paths originate from the converter, pass through the stator windings, generator stator and rotor supports, gearbox, and ultimately return to the converter. Additionally, due to inherent generator characteristics such as rotor eccentricity, uneven air gap, and magnetic circuit imbalance, numerous stray current paths with frequency doubling characteristics of the generator's fundamental frequency also exist, originating from the generator, pass through the stator windings, stator core, generator stator and rotor supports, gearbox, and ultimately return to the generator.

[0003] Stray currents of varying time scales and intensities, if left uncontrolled, can easily damage components within the gearbox, such as bearings, gears, and sealing elements. To suppress these stray currents, additional mounting sleeves and conductive elements are typically added. These sleeves and elements transfer the shaft voltage on the output shaft to the grounding point, minimizing the potential on the gearbox's output shaft and thus suppressing shaft voltage and current.

[0004] However, while existing wind turbine generators can meet the requirements for suppressing shaft voltage by adding mounting sleeves and conductive elements, the way the conductive elements are fitted with the mounting sleeves causes the conductive elements to wear out quickly, resulting in a short service life. This necessitates regular maintenance and replacement, increasing the maintenance cost of the wind turbine generators. Summary of the Invention

[0005] This application provides a wind turbine generator set that can both ensure the suppression of shaft voltage and reduce the wear of conductive components, thereby increasing the service life of the conductive components and reducing the maintenance cost of the wind turbine generator set.

[0006] On one hand, according to an embodiment of this application, a wind turbine generator set is proposed, comprising: a gearbox including an input shaft, an output shaft, and a gear system connected between the input shaft and the output shaft; a generator including a rotor and a stator that are rotatably coupled, the rotor being connected to the output shaft; a lead tube, at least partially disposed within the gearbox and the generator, one end of the lead tube being connected to the input shaft in its axial direction, and the other end of the lead tube extending into the output shaft and rotatably coupled to the output shaft; and a conductive element connected to the lead tube and abutting against the rotor, so that the shaft voltage on the rotor is guided to the grounding point through the lead tube.

[0007] According to one aspect of the embodiments of this application, the generator further includes a mounting sleeve, which is disposed around the lead tube and connected to the rotor. The radial dimension of the mounting sleeve is larger than the radial dimension of the lead tube. The mounting sleeve is used to mount a braking component, and the transmission element is located inside the mounting sleeve.

[0008] According to one aspect of the embodiments of this application, the wind turbine generator set further includes a transmission system, which includes a rotating shaft and a fixed shaft that are rotatably coupled and electrically connected. A grounding point is provided on the fixed shaft. The input shaft is connected to the rotating shaft. The shaft voltage on the rotor is guided to the grounding point via the lead tube, the rotating shaft, and the fixed shaft.

[0009] According to one aspect of the embodiments of this application, the transmission system further includes a lightning protection grounding component, the driving shaft and the fixed shaft are electrically connected through the lightning protection grounding component, and the lightning protection grounding component is disposed on one of the driving shaft and the fixed shaft and slides in cooperation with the other.

[0010] According to one aspect of the embodiments of this application, the conductive element includes a support base and a conductive element connected to each other. The support base is connected to the outer peripheral surface of the lead tube. Along the axial direction, the conductive element is clamped between the support base and the rotor and is electrically connected to the rotor and the support base.

[0011] According to one aspect of the embodiments of this application, the number of conductive elements is two or more, the two or more conductive elements are distributed at intervals along the circumference of the lead tube, each conductive element is electrically connected to the support base and the rotor respectively, the support base is in the shape of a complete ring and is arranged around the lead tube; or, the support base is in the shape of an arc plate, and each conductive element is connected to the lead tube through a support base.

[0012] According to one aspect of the embodiments of this application, along the axial direction, the surface of the rotor facing the transmission element has a first region and a second region, the first region being in sliding fit with the transmission element, the roughness of the first region being greater than the roughness of the second region; and / or, the flatness of the first region being greater than the flatness of the second region.

[0013] According to one aspect of the embodiments of this application, the rotor includes a rotor body and a friction part. The rotor body is connected to the output shaft and rotates with the stator. The friction part is detachably connected to the rotor body. A first region is located in the friction part and a second region is located in the rotor body.

[0014] According to one aspect of the embodiments of this application, the wind turbine generator set further includes a slip ring and an actuating assembly. The slip ring includes a rotating part and a fixed part that are rotatably engaged and electrically connected to each other. The fixed part is connected to the stator. The actuating assembly is connected to the lead tube and the rotating part, wherein the lead tube is insulated from the slip ring.

[0015] According to one aspect of the embodiments of this application, the toggle assembly includes a lever and a fork, one of which is connected to a lead tube and the other is connected to a rotating part, the fork extending at least partially into the lever and engaging with the lever, and at least one of the fork and the lever being made of insulating material.

[0016] According to one aspect of the embodiments of this application, a first flange is provided on the input shaft, and a second flange is provided at the end of the lead tube facing the input shaft. The first flange and the second flange are stacked on top of each other in the axial direction and are detachably connected.

[0017] According to the embodiments of this application, the wind turbine generator set includes a gearbox, a generator, a lead-in pipe, and a transmission element. The input shaft of the gearbox receives kinetic energy from the impeller, which is then transmitted to the output shaft after being increased in speed through multiple gear stages. Since the rotor of the generator is connected to the output shaft, the output shaft drives the rotor to rotate relative to the stator, realizing the conversion of wind energy into electrical energy. Because the transmission element is connected to the lead-in pipe and abuts against the rotor, the rotor can be connected to the grounding point through the transmission element and the lead-in pipe, so as to guide the stray current generated on the rotor to the grounding point and reduce damage to the generator. Furthermore, the lead-in pipe is connected to the input shaft of the gearbox and can rotate with the input shaft relative to the output shaft, so that the transmission element can rotate with the lead-in pipe. The sliding stroke of the transmission element relative to the rotor when it is stationary is reduced, which can significantly extend the service life of the transmission element, reduce maintenance work, and thus reduce the maintenance cost of the wind turbine generator set. Attached Figure Description

[0018] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0019] Figure 1 This is a partial structural schematic diagram of a wind turbine generator set according to an embodiment of this application.

[0020] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0021] Figure 3 This is a partial enlarged view of a wind power station at point A according to another embodiment of this application;

[0022] Figure 4 This is a partial structural schematic diagram of a wind turbine generator set according to yet another embodiment of this application;

[0023] Figure 5 yes Figure 4 A magnified view of a portion of the structure shown.

[0024] in:

[0025] 10-Gearbox; 11-Input shaft; 111-First flange; 12-Output shaft; 13-Box housing;

[0026] 20-Generator; 21-Rotor; 21a-First zone; 21b-Second zone; 211-Rotor body; 212-Friction part; 22-Stator; 23-Mounting sleeve;

[0027] 30 - Lead tube; 31 - Second flange;

[0028] 40 - Conductive element; 41 - Support base; 42 - Conductive component;

[0029] 50 - Transmission system; 51 - Driving shaft; 52 - Fixed shaft; 53 - Lightning protection grounding components;

[0030] 60 - Slip ring; 61 - Rotating part; 62 - Fixed part;

[0031] 70 - Toggle assembly; 71 - Toggle fork; 72 - Toggle lever;

[0032] 80-Impeller; 81-Hub; 82-Blade.

[0033] 100 - Grounding point; X - Axial direction; Y - Radial direction.

[0034] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale. Detailed Implementation

[0035] The features and exemplary embodiments of various aspects of this application will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a comprehensive understanding of this application. However, it will be apparent to those skilled in the art that this application can be implemented without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of this application by illustrating examples. In the accompanying drawings and the following description, at least some well-known structures and techniques are not shown to avoid unnecessarily obscuring the application; and, for clarity, the dimensions of some structures may be exaggerated. Furthermore, the features, structures, or characteristics described below can be combined in any suitable manner in one or more embodiments.

[0036] 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 wind turbine generator set of this application. It should also be noted in the description of this application 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 this application according to the specific circumstances.

[0037] Megawatt-class semi-direct-drive wind turbines combine the advantages of both direct-drive and doubly-fed wind turbines. Compared to doubly-fed and semi-direct-drive permanent magnet wind turbines, they have no high-speed gearbox failures, require less maintenance, and have good grid fault ride-through capability.

[0038] The gearbox and generator of a semi-direct drive unit are usually highly coupled in structure and can be assembled into a whole, hereinafter referred to as "the assembly", which can be transported and hoisted separately.

[0039] In existing wind turbine generator sets, the assembly is mechanically connected to the base at the gearbox housing. Typically, the gearbox input shaft transmits torque from the rotor to the generator via a multi-stage planetary gear train, ultimately converting wind energy into electrical energy. The generator stator is usually fixed to the gearbox housing or rear end cover, while the generator rotor is connected to the gearbox output shaft. Furthermore, the connection between the generator stator / rotor and the gearbox is usually a rigid connection, ensuring good electrical conductivity.

[0040] During wind turbine operation, numerous stray current paths with frequency doubling characteristics of the inverter's switching frequency exist, due to capacitive and conductive coupling. These paths originate from the converter, pass through the stator windings, generator stator and rotor supports, gearbox, and ultimately return to the converter. Additionally, due to inherent generator characteristics such as rotor eccentricity, uneven air gap, and magnetic circuit imbalance, numerous stray current paths with frequency doubling characteristics of the generator's fundamental frequency also exist, originating from the generator, pass through the stator windings, stator core, generator stator and rotor supports, gearbox, and ultimately return to the generator.

[0041] If stray currents of different time scales and intensities are not suppressed and controlled, they can easily cause damage to components such as bearings, gears, and sealing elements inside the gearbox.

[0042] To suppress stray currents as described above, existing wind turbine generator sets typically include an additional mounting sleeve and a corresponding grounding conductive element. The radial dimension of this mounting sleeve is much larger than the radial dimension of the gearbox's output shaft. The mounting sleeve is coaxially mounted with the gearbox's output shaft and electrically connected to it via a rotor bracket. The conductive element is arranged circumferentially on the mounting sleeve and abuts against and makes electrical contact with the sleeve. This allows the shaft voltage on the gearbox's output shaft to be transmitted to the grounding point through the rotor bracket, mounting sleeve, and conductive element, minimizing the potential on the output shaft and thus suppressing shaft voltage and shaft current.

[0043] Because the mounting sleeve rotates synchronously with the output shaft of the gearbox at high speeds, and the transmission element is typically connected to the stator and mates with the outer circumferential surface of the mounting sleeve, and because the mounting sleeve has a large outer diameter (generally greater than 0.6m), the transmission element is constantly in a state of high-speed sliding friction with the radially large mounting sleeve, even when stationary. This results in a large sliding mileage for the transmission element. In actual operation of wind turbine generators, the annual wear mileage of the transmission element can reach millions or even tens of millions of meters. This leads to a short lifespan for the transmission element, requiring regular maintenance and replacement, thus increasing the maintenance costs of wind turbine generators.

[0044] For wind turbine generators, especially offshore wind turbine generators, due to the difficulty of access, it is generally desirable to minimize the maintenance work on the transmission components.

[0045] Based on this, the embodiments of this application provide a novel wind turbine generator set that can ensure the grounding requirements of the shaft voltage, reduce the wear of conductive components, increase the service life of conductive components, and reduce the maintenance cost of the wind turbine generator set.

[0046] like Figure 1 as well as Figure 2 As shown in the embodiment of this application, the wind turbine generator set includes a tower, a nacelle, a generator 20, a gearbox 10, a lead pipe 30, a transmission element 40, and an impeller 80. The tower is connected to the wind turbine foundation, the nacelle is located at the top of the tower, the nacelle includes a base, and the nacelle can be connected to the tower through the base. The generator 20 and the gearbox 10 are located in the nacelle, and the impeller 80 includes a hub 81 and blades 82. The hub 81 is connected to the generator 20 through the gearbox 10.

[0047] The gearbox 10 includes an input shaft 11, an output shaft 12, and a gear train connecting the input shaft 11 and the output shaft 12. The generator 20 includes a rotor 21 and a stator 22 that are rotatably coupled, with the rotor 21 connected to the output shaft 12. A lead tube 30 is at least partially disposed within the gearbox 10 and the generator 20. One end of the lead tube 30 is connected to the input shaft 11 in its axial direction X, and the other end of the lead tube 30 extends into the output shaft 12 and is rotatably coupled to it. A conductive element 40 is connected to the lead tube 30 and abuts against the rotor 21, so that the shaft voltage on the rotor 21 is guided to the grounding point 100 through the lead tube 30.

[0048] Optionally, the gear train also includes a housing 13, and the input shaft 11, output shaft 12, and gear train can be disposed in the housing 13.

[0049] Optionally, the gear system may include multi-stage planetary gears, which are connected between the input shaft 11 and the output shaft 12 and located within the housing 13, and have functions such as speed increase.

[0050] Optionally, the lead tube 30 can be used to place cables, etc. Optionally, the lead tube 30 can be inserted into the inside of the output shaft 12 and directly or indirectly connected to the input shaft 11.

[0051] Since the pitch angle of blade 82 changes according to actual operating conditions, the corresponding pitch system has cables for power supply and other functions. The cables leading from impeller 80 can be inserted into lead pipe 30 for coiling and protection. Because hub 81 rotates relative to gearbox 10, connecting lead pipe 30 directly or indirectly to input shaft 11 allows lead pipe 30 to rotate with input shaft 11, preventing cable twisting in the cables leading from impeller 80 to lead pipe 30.

[0052] Optionally, the conductive element 40 has a conductive function, which enables the output shaft 12 to rotate and engage with the lead tube 30, while ensuring the electrical connection between the rotor 21 and the lead tube 30, so that the shaft voltage on the rotor 21 can be guided to the lead tube 30 through the transmission component.

[0053] The wind turbine generator set provided in this application includes a gearbox 10, a generator 20, a lead pipe 30, and a transmission element 40. The kinetic energy obtained by the impeller 80 from the input shaft 11 of the gearbox 10 is transmitted to the output shaft 12 after being accelerated through multiple gear stages. Since the rotor 21 of the generator 20 is connected to the output shaft 12, the output shaft 12 drives the rotor 21 to rotate relative to the stator 22, realizing the conversion of wind energy into electrical energy. Since the transmission element 40 is connected to the lead pipe 30 and abuts against the rotor 21, the rotor 21 can be connected to the grounding point 100 through the transmission element 40 and the lead pipe 30, so as to guide the stray current generated on the rotor 21 to the grounding point 100 and reduce damage to the generator 20. Furthermore, the lead tube 30 is connected to the input shaft 11 of the gearbox 10 and can rotate with the input shaft 11 relative to the output shaft 12, so that the transmission element 40 can rotate with the lead tube 30. The sliding stroke of the transmission element 40 relative to the rotor 21 in the stationary state is reduced, which can greatly extend the service life, reduce maintenance work, and reduce the maintenance cost of the wind turbine generator set.

[0054] In some optional embodiments, the wind turbine generator set provided in this application includes a generator 20 further comprising a mounting sleeve 23, which surrounds the lead pipe 30 and is connected to the rotor 21. The radial dimension of the mounting sleeve 23 is larger than the radial dimension of the lead pipe 30. The mounting sleeve 23 is used to mount brake components, and the transmission element 40 is located inside the mounting sleeve 23.

[0055] Alternatively, the inner diameter of the mounting sleeve 23 may be greater than or equal to five times the outer diameter of the lead tube 30.

[0056] Optionally, the braking component is used to cooperate with the stator 22 to lock the relative position of the rotor 21 and the stator 22 in the event of a malfunction or shutdown requirement.

[0057] The wind turbine generator set provided in this application embodiment, by setting the installation sleeve 23, can facilitate the installation of structures such as brake components and ensure the safety performance of the generator 20.

[0058] Furthermore, this application changes the original technical approach, no longer having the transmission element 40 abut against the mounting sleeve 23 with a larger diameter and higher rotational speed connected to the rotor 21. Instead, the transmission element 40 is connected to the lead tube 30, and the transmission element 40 is connected to the lead tube 30 and abuts against the rotor 21. At the same time, the transmission element 40 is located inside the mounting sleeve 23, which effectively reduces the size of the transmission element 40 in the radial Y direction of the lead tube 30, which can further reduce the sliding distance of the transmission element 40, thereby reducing the wear of the transmission element 40, increasing the service life of the transmission element 40, and reducing the maintenance cost of the wind turbine generator set.

[0059] In some optional embodiments, the wind turbine generator set provided in this application includes a transmission element 40 comprising a support base 41 and a conductive element 42 connected to each other. The support base 41 is connected to the outer peripheral surface of the lead tube 30 along the axial direction X. The conductive element 42 is clamped between the support base 41 and the rotor 21 and is electrically connected to the rotor 21 and the support base 41.

[0060] The support base 41 and the lead tube 30 can be fixedly connected by means of bonding, welding or other methods. Of course, the support base 41 and the lead tube 30 can also be detachably connected by fasteners such as bolts.

[0061] The conductive component 42 and the support base 41 can be connected by a fixed method, or they can be connected by a detachable method using fasteners such as bolts.

[0062] The wind turbine generator set provided in this application embodiment includes a support base 41 and a conductive element 42 connected to each other. The support base 41 can be connected to the lead pipe 30, and the conductive element 42 can be slidably contacted and electrically connected to the rotor 21, ensuring the electrical connection requirements between the rotor 21 and the lead pipe 30 and facilitating the output of shaft voltage on the rotor 21.

[0063] In some optional embodiments, the wind turbine generator set provided in this application has two or more conductive elements 42, which are distributed at intervals along the circumference of the lead tube 30. Each conductive element 42 is electrically connected to the support base 41 and the rotor 21 respectively. The support base 41 is in a ring shape and is arranged around the lead tube 30.

[0064] Optionally, there may be two or more conductive elements 42, and the two or more conductive elements 42 may have the same structure. Each conductive element 42 may be a sheet-like structure, and an arc-shaped sheet structure may be selected.

[0065] Optionally, the number of conductive elements 42 can be two, or of course three, four, or even more. Two or more conductive elements 42 can be sequentially spliced ​​together in the circumference of the lead tube 30, or they can be spaced apart from each other.

[0066] The wind turbine generator set provided in this application embodiment, by having the support base 41 arranged in a ring shape and surrounding the lead pipe 30, facilitates the connection requirements between the support base 41 and the lead pipe 30 and allows for the installation of two or more conductive components 42. Simultaneously, by having two or more conductive components 42, multi-point contact with the rotor 21 can be ensured, facilitating shaft voltage output. When any conductive component 42 is damaged, only the conductive component 42 at the corresponding location needs to be replaced, reducing maintenance costs.

[0067] It is understood that the ring-shaped support 41 surrounding the lead tube 30 is only one optional implementation method, but is not limited to the above method. In some embodiments, the support 41 can also be made into an arc-shaped plate, with each conductive element 42 connected to the lead tube 30 through a support 41. This can also meet the installation requirements of each conductive element 42 and ensure the transmission requirements of the shaft voltage on the rotor 21.

[0068] In some alternative embodiments, the wind turbine generator provided in this application has a first region 21a and a second region 21b on the side of the rotor 21 facing the transmission element 40 along the axial direction X. The first region 21a is in sliding fit with the transmission element 40, and the roughness of the first region 21a is greater than the roughness of the second region 21b.

[0069] Optionally, the first region 21a can be a region for sliding engagement with the conductive element 40. Along the axial direction X, the orthographic projection of the first region 21a covers the conductive element 40, and the orthographic projection of the second region 21b is offset from the conductive element 40.

[0070] The wind turbine generator set provided in this application embodiment has a first region 21a and a second region 21b on the surface of the adapter facing the transmission element 40, and the first region 21a is slidably engaged with the transmission element 40, which can improve the coupling degree between the rotor 21 and the transmission element 40 and ensure the electrical connection requirements between the two.

[0071] In some alternative embodiments, the flatness of the first region 21a of the wind turbine generator provided in this application is greater than the flatness of the second region 21b.

[0072] The wind turbine generator set provided in this application embodiment, through the above-mentioned settings, can ensure the smoothness of the rotor 21 relative to the conductive element 40, avoid interference of the poor flatness of the first region 21a with the rotation of the rotor 21, and avoid the rotor 21 causing different wear on the conductive elements 42 at different positions when rotating due to the poor flatness of the first region 21a, thus ensuring the consistency of the lifespan of each conductive element 42.

[0073] In some optional embodiments, the first zone 21a of the wind turbine generator provided in this application can be directly formed by machining on the rotor body 211. Of course, this is an optional embodiment, but it is not limited to the above method.

[0074] like Figure 3 As shown, in some embodiments, the rotor 21 may include a rotor body 211 and a friction part 212. The rotor body 211 is connected to the output shaft 12 and rotates with the stator 22. The friction part 212 is detachably connected to the rotor body 211. The first region 21a is located in the friction part 212 and the second region 21b is located in the rotor body 211.

[0075] The above settings can also meet the roughness requirements of different zones of rotor 21, ensuring the conduction requirements of shaft voltage on rotor 21.

[0076] In some optional embodiments, the friction part 212 of the wind turbine generator provided in this application can be in the form of a ring and disposed at one end of the rotor body 211 in the axial direction X. The friction part 212 and the rotor body 211 can be detachably connected by fastening methods such as bolts.

[0077] Continue reading Figures 1 to 3 As shown, in some optional embodiments, the wind turbine generator set provided in this application embodiment further includes a transmission system 50. The transmission system 50 includes a rotating shaft 51 and a fixed shaft 52 that are rotatably engaged and electrically connected. A grounding point 100 is provided on the fixed shaft 52. The input shaft 11 is connected to the rotating shaft 51. The shaft voltage on the rotor 21 is guided to the grounding point 100 via the lead tube 30, the rotating shaft 51 and the fixed shaft 52.

[0078] Optionally, the moving shaft 51 can also be located outside the fixed shaft 52; of course, the moving shaft 51 can also be located inside the fixed shaft 52. For example, to better understand the wind turbine generator set provided in this application embodiment, an example will be given where the moving shaft 51 is located inside the fixed shaft 52.

[0079] Optionally, the moving shaft 51 can be connected to the hub 81. When wind energy acts on the blade 82, the blade 82 can drive the hub 81 to rotate, and then drive the moving shaft 51 to rotate relative to the fixed shaft 52 through the hub 81. Since the input shaft 11 is connected to the moving shaft 51, the kinetic energy of the hub 81 can be transferred to the input shaft 11 through the moving shaft 51, thus meeting the requirements for kinetic energy transfer.

[0080] Due to the high integration of the generator 20 and the gearbox 10, the structure is compact, and the installation positions of the grounding carbon brush and carbon conductive element 40 are constrained. The conductive element 40 is usually installed on the side of the generator 20 away from the gearbox 10. Existing wind turbine generator sets usually conduct the shaft voltage generated on the rotor 21 to the grounding point on the stator 22 through the conductive element 40 and the configured bracket and other structural components. This layout usually easily generates low-frequency or high-frequency loop currents that can damage the main bearing that mates with the output shaft 12.

[0081] The wind turbine generator assembly provided in this application embodiment has a grounding point 100 on the fixed shaft 52 of the transmission system 50 in the wind turbine generator set, and the moving shaft 51 is rotatably engaged and electrically connected to the fixed shaft 52. Simultaneously, the input shaft 11 is connected to the moving shaft 51. This allows the shaft voltage transmitted from the rotor 21 to the lead tube 30 to be guided to the grounding point 100 via the moving shaft 51 and the fixed shaft 52, thus achieving grounding bypass protection for the shaft voltage on the rotor 21. The voltage is not conducted to the grounding point on the stator 22, avoiding the formation of loop current and improving the safety performance of the wind turbine generator set.

[0082] In some optional embodiments, the wind turbine generator set provided in this application includes a transmission system 50 that further includes a lightning protection grounding component 53. The moving shaft 51 and the fixed shaft 52 are electrically connected through the lightning protection grounding component 53. The lightning protection grounding component 53 is disposed on one of the moving shaft 51 and the fixed shaft 52 and slides in cooperation with the other.

[0083] Optionally, the lightning protection grounding component 53 can be installed on the fixed shaft 52 and slidably engaged with the moving shaft 51. In some examples, the lightning protection grounding component 53 can also be installed on the moving shaft 51 and slidably engaged with the fixed shaft 52. Both of these methods can avoid interference with the rotation between the moving shaft 51 and the fixed shaft 52, while ensuring the electrical connection requirements between the moving shaft 51 and the fixed shaft 52 and guaranteeing the transmission of shaft voltage.

[0084] In some optional embodiments, the wind turbine generator set provided in this application has a first flange 111 on the input shaft 11 and a second flange 31 on one end of the lead pipe 30 facing the input shaft 11. The first flange 111 and the second flange 31 are stacked on top of each other in the axial direction X and are detachably connected.

[0085] The wind turbine generator set provided in this application embodiment, by providing a first flange 111 on the input shaft 11 and a second flange 31 on the lead pipe 30, can not only ensure the connection requirements between the input shaft 11 and the lead pipe 30, but also facilitate the disassembly and assembly of the two.

[0086] Optionally, the input shaft 11 can be a hollow structure, and the first flange 111 can be located inside the input shaft 11 and connected to the inner wall of the input shaft 11. The first flange 111 and the input shaft 11 can be welded or integrally formed. The second flange 31 can be located outside the lead tube 30 and connected to the outer wall of the lead tube 30. The second flange 31 and the lead tube 30 can be welded or integrally formed.

[0087] The above arrangement facilitates the stacking of the first flange 111 and the second flange 31, while ensuring that the two are stacked and connected.

[0088] like Figure 4 as well as Figure 5 As shown in some optional embodiments, the wind turbine generator set provided in this application embodiment further includes a slip ring 60 and an actuating assembly 70. The slip ring 60 includes a rotating part 61 and a fixed part 62 that are rotatably engaged and electrically connected to each other. The fixed part 62 is connected to the stator 22. The actuating assembly 70 is connected to the lead tube 30 and the rotating part 61. The lead tube 30 is insulated from the slip ring 60.

[0089] A slip ring 60, also known as a collector ring, can be used in any electromechanical system that requires continuous rotation while transmitting power and signals from a fixed position to a rotating position. Slip ring 60 improves system performance, simplifies system structure, and prevents wires from twisting during rotation.

[0090] In the wind turbine generator set, the hub 81 and blades 82 are connected via a pitch system. This system changes the pitch angle of the blades 82 and connects to multiple cables. A lead-in conduit 30 is used to house these cables. The cables pass through the lead-in conduit 30 and are electrically connected to the rotating part 61 of the slip ring 60. The lead-in conduit 30 is mechanically connected to the rotating part 61 of the slip ring 60 via an actuating assembly 70. The rotational kinetic energy of the lead-in conduit 30 is transferred to the rotating part 61 through the actuating assembly 70, causing the rotating part 61 to rotate synchronously with the cable, preventing cable twisting. Furthermore, while rotating relative to the fixed part 62 of the slip ring 60, the rotating part 61 can transmit various signals, ensuring the functional requirements of the wind turbine generator set.

[0091] The wind turbine generator set provided in this application embodiment, by setting a slip ring 60 and a toggle assembly 70, can both avoid cable twisting and meet the transmission requirements of various signals. At the same time, by insulating the lead tube 30 from the slip ring 60, it can further prevent the formation of a loop current in the shaft voltage on the rotor 21, which is conducive to the bypass transmission of the shaft voltage to the grounding point 100.

[0092] In some alternative embodiments, the actuating assembly 70 includes a lever 72 and a fork 71, one of which is connected to the lead tube 30 and the other is connected to the rotating part 61. The fork 71 extends at least partially into the lever 72 and engages with the lever 72. At least one of the fork 71 and the lever 72 is made of insulating material.

[0093] Optionally, the lever 72 can be connected to the lead tube 30 and the shift fork 71 can be connected to the rotating part 61. Of course, in some embodiments, the lever 72 can also be connected to the rotating part 61 and the shift fork 71 can be connected to the lead tube 30.

[0094] Optionally, the shift fork 71 can be made of an insulating material, or the shift lever 72 can be made of an insulating material. Of course, in some embodiments, both the shift fork 71 and the shift lever 72 can be made of insulating materials.

[0095] The wind turbine generator set provided in this application embodiment effectively avoids cable twisting by making the toggle assembly 70 include a lever 72 and a fork 71, and by limiting the cooperation relationship between the fork 71 and the lever 72 and the lead tube 30 and the rotating part 61 respectively. At the same time, by making at least one of the fork 71 and the lever 72 an insulating material, the transmission of shaft voltage on the toggle assembly 70 can be blocked, effectively preventing the formation of loop current.

[0096] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This 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 wind turbine generator set, characterized in that, include: The gearbox (10) includes an input shaft (11), an output shaft (12), and a gear train connected between the input shaft (11) and the output shaft (12); The generator (20) includes a rotor (21) and a stator (22) that are rotatably coupled, the rotor (21) being connected to the output shaft (12); A lead tube (30) is at least partially disposed in the gearbox (10) and the generator (20). One end of the lead tube (30) in its own axial direction (X) is connected to the input shaft (11), and the other end of the lead tube (30) extends into the output shaft (12) and rotates with the output shaft (12). A conductive element (40) is connected to the lead tube (30) and abuts against the rotor (21) so that the shaft voltage on the rotor (21) is guided to the ground point (100) through the lead tube (30).

2. The wind turbine generator set according to claim 1, characterized in that, The generator (20) also includes a mounting sleeve (23) which surrounds the lead tube (30) and is connected to the rotor (21). The radial dimension of the mounting sleeve (23) is greater than that of the lead tube (30). The mounting sleeve (23) is used to mount the brake component. The conductive element (40) is located inside the mounting sleeve (23).

3. The wind turbine generator (20) set according to claim 1, characterized in that, The wind turbine generator set also includes a transmission system (50), which includes a rotating shaft (51) and a fixed shaft (52) that are rotatably coupled and electrically connected. The fixed shaft (52) is provided with the grounding point (100). The input shaft (11) is connected to the rotating shaft (51). The shaft voltage on the rotor (21) is guided to the grounding point (100) via the lead tube (30), the rotating shaft (51) and the fixed shaft (52).

4. The wind turbine generator set according to claim 3, characterized in that, The transmission system (50) also includes a lightning protection grounding component (53). The moving shaft (51) and the fixed shaft (52) are electrically connected through the lightning protection grounding component (53). The lightning protection grounding component (53) is disposed on one of the moving shaft (51) and the fixed shaft (52) and slides in cooperation with the other.

5. The wind turbine generator (20) set according to claim 1, characterized in that, The conductive element (40) includes a support base (41) and a conductive element (42) connected to each other. The support base (41) is connected to the outer peripheral surface of the lead tube (30) along the axial direction (X) of the lead tube (30). The conductive element (42) is clamped between the support base (41) and the rotor (21) and is electrically connected to the rotor (21) and the support base (41).

6. The wind turbine generator set according to claim 5, characterized in that, The number of the conductive elements (42) is two or more, and the two or more conductive elements (42) are distributed at intervals along the circumference of the lead tube (30). Each conductive element (42) is electrically connected to the support base (41) and the rotor (21). The support base (41) is in the shape of a ring and surrounds the lead tube (30); or, the support base (41) is in the shape of an arc plate, and each of the conductive elements (42) is connected to the lead tube (30) through one of the support bases (41).

7. The wind turbine generator set according to claim 1, characterized in that, Along the axial direction (X), the surface of the rotor (21) facing the conductive element (40) has a first region (21a) and a second region (21b), the first region (21a) slidingly engaging with the conductive element (40), the roughness of the first region (21a) being greater than the roughness of the second region (21b); and / or, the flatness of the first region (21a) being greater than the flatness of the second region (21b).

8. The wind turbine generator set according to claim 7, characterized in that, The rotor (21) includes a rotor body (211) and a friction part (212). The rotor body (211) is connected to the output shaft (12) and rotates in cooperation with the stator (22). The friction part (212) is detachably connected to the rotor body (211). The first area (21a) is located in the friction part (212) and the second area (21b) is located in the rotor body (211).

9. The wind turbine generator set according to any one of claims 1 to 8, characterized in that, The wind turbine generator set also includes a slip ring (60) and an actuating assembly (70). The slip ring (60) includes a rotating part (61) and a fixed part (62) that are rotatably engaged and electrically connected to each other. The fixed part (62) is connected to the stator (22). The actuating assembly (70) is connected to the lead tube (30) and the rotating part (61). The lead tube (30) is insulated from the slip ring (60).

10. The wind turbine generator set according to claim 9, characterized in that, The actuating assembly (70) includes a lever (72) and a fork (71). One of the lever (72) and the fork (71) is connected to the lead tube (30) and the other is connected to the rotating part (61). The fork (71) extends at least partially into the lever (72) and engages with the lever (72). At least one of the fork (71) and the lever (72) is made of insulating material.

11. The wind turbine generator set according to any one of claims 1 to 8, characterized in that, The input shaft (11) is provided with a first flange (111), and the lead tube (30) is provided with a second flange (31) at one end facing the input shaft (11). The first flange (111) and the second flange (31) are stacked on each other in the axial direction (X) and are detachably connected.

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