Wind turbine generator system

Abstract

The application relates to a wind turbine, which comprises a gearbox, a generator and a conductive element. The gearbox comprises a gearbox body, a gear train arranged in the gearbox body and an output shaft connected with an output end of the gear train. The generator comprises a rotor, a stator, a lead tube and a transmission member. The rotor is connected with the output shaft. The stator is connected with the gearbox body and rotationally cooperates with the rotor. The lead tube at least partially extends into the output shaft. The output shaft rotationally cooperates with the lead tube through the transmission member and is electrically connected with the lead tube. The conductive element is connected with the stator and abuts against the lead tube, so as to guide the shaft voltage on the output shaft to the grounding point through the transmission member and the lead tube. The wind turbine provided by the embodiment of the application can not only ensure the grounding requirement of the shaft voltage, but also reduce the abrasion of the conductive element, prolong the service life of the conductive element and reduce the maintenance cost of the wind turbine.

Description

Technical Field

[0001] This invention 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 invention 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 conductive components and reducing the maintenance cost of the wind turbine generator set.

[0006] On one hand, according to an embodiment of the present invention, a wind turbine generator set is provided, comprising: a gearbox including a housing, a gear train disposed in the housing, and an output shaft connected to the output end of the gear train; a generator including a rotor, a stator, a lead tube, and a transmission component, wherein the rotor is connected to the output shaft, the stator is connected to the housing and rotatably engages with the rotor, the lead tube extends at least partially into the output shaft, and the output shaft is rotatably engaged with and electrically connected to the lead tube through the transmission component; and a conductive element connected to the stator and abutting against the lead tube to guide the shaft voltage on the output shaft to a grounding point via the transmission component and the lead tube.

[0007] According to one aspect of the present invention, the transmission component includes a bearing body and a lubricant filled within the bearing body, the lubricant being a conductor.

[0008] According to one aspect of the present invention, the lubricant includes conductive grease and conductive particles mixed in the conductive grease.

[0009] According to one aspect of the present invention, the transmission component includes two or more bearing bodies distributed along the axial direction of the lead tube, and each bearing body is filled with lubricant.

[0010] According to one aspect of the present invention, the gearbox further includes an input shaft connected to the input end of the gear train, and a lead tube extending into one end of the output shaft and connected to the input shaft to obtain kinetic energy from the input shaft.

[0011] According to one aspect of the present invention, in the axial direction of the lead tube, the lead tube at least partially protrudes from the output shaft in a direction away from the housing and forms a connecting portion, and a conductive element abuts against the connecting portion and slides in cooperation with the connecting portion.

[0012] According to one aspect of the present invention, the number of conductive elements is one, and the conductive element is an arc-shaped structure or a ring-shaped structure extending a predetermined length along the circumference of the lead tube.

[0013] According to one aspect of the present invention, there are multiple conductive elements, each of which is an arc-shaped structure extending a predetermined length along the circumference of the lead tube. The multiple conductive elements are distributed at intervals or sequentially along the circumference of the lead tube.

[0014] According to one aspect of the present invention, the generator further includes an adapter bracket, one end of which is connected to the side of the stator away from the housing, and the other end of which is connected to a conductive element such that the conductive element abuts against the output shaft.

[0015] According to one aspect of the present invention, an adapter bracket is disposed around the outer peripheral surface of a lead tube, and in the radial direction of the lead tube, a conductive element is at least partially located between the adapter bracket and the outer peripheral surface and abuts against the outer peripheral surface of the lead tube.

[0016] According to one aspect of the present invention, in the axial direction of the lead tube, the adapter bracket is spaced apart from the shaft end face of the lead tube away from the gearbox, and in the axial direction, the conductive element is at least partially located between the adapter bracket and the shaft end face and abuts against the shaft end face.

[0017] According to one aspect of the present invention, the stator includes a stator support, the stator support is connected to a grounding cable, and a transfer bracket is electrically in contact with a conductive element and the stator support, such that the shaft voltage transmitted to the conductive element is transmitted sequentially to a grounding point via the transfer bracket, the stator support and the grounding cable.

[0018] According to one aspect of the present invention, the generator further includes a mounting sleeve, which is disposed around the lead tube and connected to the output shaft, wherein the radial dimension of the mounting sleeve is greater than or equal to 5 times the radial dimension of the lead tube, and the mounting sleeve is used to mount a brake component.

[0019] According to one aspect of the present invention, the rotor is disposed inside the stator, and the stator is connected to the end of the housing facing the generator.

[0020] According to an embodiment of the present invention, a wind turbine generator set includes a gearbox, a generator, and conductive elements. The gearbox includes a housing, a gear train disposed within the housing, and an output shaft connected to the output end of the gear train. The stator of the generator is connected to the housing, and the rotor is connected to the output shaft. The input end of the gear train can obtain kinetic energy from the hub and rotate. After speed regulation by the gear train, the energy is transmitted to the rotor through the output shaft, causing the rotor to rotate relative to the stator, thereby realizing the conversion of wind energy into electrical energy.

[0021] The lead tube extends into the output shaft and rotates and is electrically connected to the output shaft through a transmission component. The conductive element is connected to the stator and abuts against the lead tube. This allows the shaft voltage on the output shaft to be guided to the grounding point via the transmission component and the lead tube. The lead tube needs to be inserted into the output shaft, and its radial dimension is smaller than that of the output shaft. At the same time, the lead tube is used to connect cables and does not require the high rotational speed of the output shaft. The conductive element abuts against the lead tube and transmits the shaft voltage. During the same working period, the wind turbine generator can effectively reduce the sliding distance of the conductive element relative to the lead tube, thereby reducing the wear of the conductive element, increasing its service life, and reducing the maintenance cost of the wind turbine generator. Attached Figure Description

[0022] The features, advantages and technical effects of exemplary embodiments of the present invention will now be described with reference to the accompanying drawings.

[0023] Figure 1 This is a partial structural schematic diagram of a wind turbine generator set according to an embodiment of this application;

[0024] Figure 2 This is an isometric view of a gearbox and generator assembly according to an embodiment of this application;

[0025] Figure 3 This is a cross-sectional view of a gearbox and generator assembly according to an embodiment of this application;

[0026] Figure 4 yes Figure 3 A magnified view of a section at point A in the middle;

[0027] Figure 5 This is a partial structural schematic diagram of a gearbox and generator assembly according to another embodiment of this application.

[0028] in:

[0029] 10-Gearbox; 11-Box housing; 111-End cover; 121-Output shaft; 122-Input shaft;

[0030] 20-Generator; 21-Rotor; 211-Rotor bracket; 22-Stator; 221-Stator bracket; 23-Lead pipe; 231-Connecting part; 24-Transmission component; 241-Bearing body; 25-Adapter bracket; 26-Mounting sleeve;

[0031] 30 - Conductive elements;

[0032] 40-Impeller; 41-Hub; 42-Blade; 50-Nacelle; 60-Tower; 70-Grounding cable;

[0033] 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 induction generators (DFIGs). Compared to DFIGs and semi-direct-drive permanent magnet wind turbines, they eliminate high-speed gearbox failures, require less maintenance, and offer excellent grid fault ride-through capability. Furthermore, compared to direct-drive wind turbines, they use fewer high-cost materials such as copper, magnets, and silicon steel, resulting in a significant cost advantage. With the wind power market entering the grid parity phase, customer demand for lower total lifecycle costs is increasingly prominent, making semi-direct-drive wind turbines a growing industry mainstream.

[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, due to capacitive and conductive coupling, numerous stray current paths exist, each exhibiting frequency doubling characteristics of the inverter's switching frequency, flowing from the converter through the stator windings, generator stator and rotor supports, gearbox, and ultimately back to the converter. Additionally, due to inherent generator characteristics such as rotor eccentricity, uneven air gap, and magnetic circuit imbalance, numerous stray current paths also exist, flowing from the generator through the stator windings, stator core, generator stator and rotor supports, gearbox, and ultimately back to the generator, each exhibiting frequency doubling characteristics of the generator's fundamental frequency.

[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 with a corresponding groundable conductive element. The radial dimension of this mounting sleeve is significantly larger than that 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 it, making electrical contact. 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 a high speed, the conductive element and the mounting sleeve are constantly in a state of high-speed sliding friction during the operation of the wind turbine generator set. The conductive element has a large sliding mileage. For example, the radial dimension of the sleeve structure is generally greater than 0.6m. In addition, the rotor speed is usually in the range of 200rpm to 900rpm. Therefore, in actual operation of the wind turbine generator set, the wear mileage of the conductive element can reach millions or even tens of millions of meters per year. This results in a short lifespan of the conductive element, requiring regular maintenance and replacement, which increases the maintenance cost of the wind turbine generator set.

[0044] For wind turbine generator sets, especially for offshore wind turbine generator sets, due to the difficulty of access, it is generally desirable to minimize the maintenance work on conductive 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] Please see Figures 1 to 4 As shown, the wind turbine generator set includes a tower 60, a nacelle 50, a generator 20, a gearbox 10, conductive elements 30, and an impeller 40. The tower 60 is connected to the wind turbine foundation. The nacelle 50 is located at the top of the tower 60 and includes a base. The nacelle 50 can be connected to the tower 60 through the base. The generator 20 and the gearbox 10 are located in the nacelle 50. The impeller 40 includes a hub 41 and blades 42. The hub 41 is connected to the generator 20 through the gearbox 10.

[0047] The gearbox 10 includes a housing 11, a gear train disposed on the housing 11, and an output shaft 121 connected to the output end of the gear train.

[0048] The generator 20 includes a rotor 21, a stator 22, a lead tube 23, and a transmission component 24. The rotor 21 is connected to the output shaft 121, and the stator 22 is connected to the housing 11 and rotatably engages with the rotor 21. The lead tube 23 extends at least partially into the output shaft 121, and the output shaft 121 is rotatably engaged with and electrically connected to the lead tube 23 via the transmission component 24. A conductive element 30 is connected to the stator 22 and abuts against the lead tube 23 to guide the shaft voltage on the output shaft 121 to the ground point via the transmission component 24 and the lead tube 23.

[0049] Optionally, the gear train also includes an input shaft 122, which can be directly or indirectly connected to the hub 41.

[0050] Optionally, the gear system may include a multi-stage planetary gear, which is connected between the input shaft 122 and the output shaft 121 and located inside the housing 11, and has functions such as speed increase.

[0051] Optionally, the lead tube 23 can be used to place cables, etc. Optionally, the lead tube 23 can be inserted into the inside of the output shaft 121 and directly or indirectly connected to the hub 41. For example, it can be directly connected to the hub 41, or it can be indirectly connected to the hub 41 through the input shaft 122 of the gear system.

[0052] Since the pitch angle of the blade 42 changes according to the actual operating conditions, the corresponding pitch system has cables for powering the pitch system. The cables leading out from the impeller 40 can be inserted into the lead tube 23 for winding and protection. Because the hub 41 rotates relative to the gearbox 10, by directly or indirectly connecting the lead tube 23 to the hub 41, the lead tube 23 can rotate with the hub 41, preventing cable twisting of the cables leading from the impeller 40 to the lead tube 23.

[0053] Optionally, the transmission component 24 has a conductive function, which enables the output shaft 121 to rotate and engage with the lead tube 23, while ensuring the electrical connection between the two, so that the shaft voltage on the output shaft 121 can be guided to the lead tube 23 through the transmission component 24.

[0054] Optionally, the transmission component 24 may be a ring-shaped structure and clamped between the output shaft 121 and the lead tube 23.

[0055] Optionally, the transmission component 24 may include structural components such as a metal ring or a bearing.

[0056] The wind turbine generator set provided in this application embodiment, when wind force acts on the blades 42, the blades 42 will drive the hub 41 to rotate. Since the input shaft 122 of the gear system can be directly or indirectly connected to the hub 41, the hub 41 will drive the input shaft 122 of the gear system to rotate. The rotational speed of the input shaft 122 is the rotational speed of the impeller 40. A multi-stage planetary gear is provided between the input shaft 122 and the output shaft 121. The low rotational speed transmitted from the hub 41 can be increased to a high rotational speed that meets the power generation requirements of the generator 20 through the multi-stage planetary gear, so that the rotational speed of the output shaft 121 of the gear system relative to the input shaft 122 increases. The output shaft 121 will drive the rotor 21 of the generator 20 to rotate relative to the stator 22, so that the rotor 21 rotates relative to the stator 22, realizing the conversion of energy into electrical energy.

[0057] The lead tube 23 extends into the output shaft 121 and is rotatably engaged with and electrically connected to the output shaft 121 through the transmission component 24. The conductive element 30 is connected to the stator 22 and abuts against the lead tube 23. This allows the shaft voltage on the output shaft 121 to be guided to the grounding point through the transmission component 24 and the lead tube 23. The lead tube 23 needs to be inserted into the output shaft 121, and its radial Y dimension is smaller than that of the output shaft 121. The lead tube 23 is used to insert cables and does not need to rotate at a high speed like the output shaft 121. It should be kept close to the speed of the impeller 40 to avoid cable twisting. Data collected shows that when the wind turbine is running, the rotor 40 rotates at a speed of 5 rpm to 10 rpm. This means that the lead pipe 23 rotates at a speed of 5 rpm to 10 rpm. After the gear system speeds up the output shaft 121, the speed range increases to approximately 200 rpm to 900 rpm. In other words, the speed range of the structures connected to the output shaft 121 is approximately 200 rpm to 900 rpm.

[0058] This application changes the original technical approach, no longer having the conductive element 30 abut against a mounting sleeve with a larger diameter and higher rotational speed connected to the output shaft 121. Instead, the conductive element 30 abuts against a lead tube 23 with a smaller diameter and lower rotational speed. The conductive element 30 abuts against the lead tube 23 and transmits shaft voltage. During the same working period of the wind turbine generator set, the sliding distance of the conductive element 30 relative to the lead tube 23 can be effectively reduced, thereby reducing the wear of the conductive element 30, increasing the service life of the conductive element 30, and reducing the maintenance cost of the wind turbine generator set.

[0059] Optionally, the housing 11 has an end cover 111, which can be disposed away from the impeller 40. The end cover 111 and the main body of the housing 11 can be connected by a structure such as a flange. The output shaft 121 of the gear train can protrude from the end cover 111 of the housing 11 and be connected to the rotor 21. The end cover 111 can be used to support the output shaft 121 and rotate with the output shaft 121.

[0060] As an optional implementation, the wind turbine generator set provided in this application embodiment includes a transmission component 24 comprising a bearing body 241 and a lubricant filled within the bearing body 241, wherein the lubricant is a conductor.

[0061] Optionally, the bearing body 241 itself may be made of conductive metal, which has high strength and wear resistance, and is also conductive.

[0062] Optionally, lubricant can fill the lubrication tracks of the bearing body 241, and the lubricant can be a grease that combines electrical conductivity and lubrication, which is available in bearings in the prior art.

[0063] Optionally, the bearing body 241 may include a rotating inner ring and an outer ring. The inner ring is connected to the lead tube 23, and the outer ring is connected to the output shaft 121. By including the bearing body 241 and lubricant in the transmission component 24, the bearing body 241 can meet the rotational connection requirements between the output shaft 121 and the lead tube 23, allowing the output shaft 121 and the lead tube 23 to rotate independently at different speeds, avoiding mutual interference. The lubricant not only lubricates the bearing body 241, ensuring smooth relative rotation between the inner and outer rings, but also, the conductive material in the lubricant allows the shaft voltage on the output shaft 121 to be transmitted to the lead tube 23 through the transmission component 24, and then to the grounding point through the conductive element 30.

[0064] As an alternative implementation, the lubricant includes conductive grease and conductive particles mixed within the conductive grease.

[0065] Optionally, conductive grease such as Pseinu B.GREASE-65 (EP-E) conductive bearing grease can be used for bearings requiring conductive connection between the inner and outer rings. It contains conductive ions. Alternatively, EccoGrease EC10-2H can be used. This black conductive grease is made from high-purity conductive carbon black thickened synthetic oil with added polymer conductive agents, antioxidants, corrosion inhibitors, and other additives through a special process. This conductive grease is designed for lubrication of energized contact and rotating parts in high and low voltage electrical equipment, reducing contact resistance and temperature rise, and preventing metal oxidation and corrosion.

[0066] It is understood that the conductive greases mentioned above are just some optional examples and are not limited to the examples mentioned above. Any grease that meets the functions of conductivity and lubrication is acceptable.

[0067] Alternatively, the conductive particles can be metal particles, etc.

[0068] The wind turbine generator set provided in this application uses the above-described form of lubricant, which can ensure the lubrication effect and improve its conductivity, thus facilitating the transmission of shaft voltage on the output shaft 121 to the lead tube 23 through the transmission component 24.

[0069] Optionally, as analyzed above, the wind turbine generator set provided in this application embodiment further includes an input shaft 122 connected to the input end of the gear system in its gearbox 10, and a lead tube 23 extending into one end of the output shaft 121 and connected to the input shaft 122 so as to obtain kinetic energy from the input shaft 122.

[0070] In other words, the input shaft 122 can be connected to the hub 41, and the lead tube 23 is indirectly connected to the hub 41 through the input shaft 122, so that the same rotational speed as the hub 41 can be obtained through the input shaft 122.

[0071] The wind turbine generator set provided in this application embodiment can reduce the length of the lead pipe 23 by connecting one end of the lead pipe 23 to the input shaft 122 and obtaining kinetic energy from the input shaft 122. At the same time, it can rotate synchronously with the impeller 40, avoiding the occurrence of cable twisting.

[0072] As an optional implementation, in the wind turbine generator set provided in this application embodiment, the lead pipe 23 protrudes from the output shaft 121 at least partially in the direction away from the housing 11 along the axial direction X and forms a connection portion 231, and the conductive element 30 abuts against the connection portion 231 and slides in cooperation with the connection portion 231.

[0073] Optionally, the lead tube 23 can be a tube with a uniform cross-section.

[0074] Optionally, the length of the protrusion in the axial direction X is greater than the length of the conductive element 30 in the axial direction X, which facilitates the contact between the two.

[0075] Optionally, the conductive element 30 can abut against the end face of the protrusion in the axial direction X, or it can abut against the outer peripheral surface of the protrusion.

[0076] The wind turbine generator set provided in this application embodiment has a lead tube 23 that protrudes at least partially from the output shaft 121 in the axial direction X and forms a connection portion 231. This facilitates meeting the contact requirements between the lead tube 23 and the conductive element 30, while limiting their sliding fit to ensure electrical contact requirements.

[0077] As an optional implementation, the wind turbine generator set provided in this application embodiment has one conductive element 30, which is an arc-shaped structure or a ring-shaped structure extending a predetermined length along the circumference of the lead tube 23.

[0078] Optionally, the conductive element 30 can be an arc-shaped structure extending a predetermined length along the circumference of the lead tube 23. One end of the arc-shaped structure can abut against the end face of the lead tube 23 in the axial direction X. Alternatively, the conductive element 30 can be arranged to surround at least part of the lead tube 23 in the circumferential direction to abut against the outer circumferential surface of the lead tube 23.

[0079] Optionally, the conductive element 30 can also be a ring-shaped structure extending circumferentially along the lead tube 23. When it is a ring-shaped structure, the conductive element 30 can abut against the end face of the lead tube 23 in the axial direction at one end in the X direction. Of course, the conductive element 30 can also be arranged to surround the lead tube 23 in the circumferential direction so as to abut against the outer circumferential surface of the lead tube 23.

[0080] The wind turbine generator set provided in this application embodiment has a simple structure for the conductive element 30, which is a single conductive element 30. The conductive element 30 is an arc-shaped structure or a ring-shaped structure that extends a predetermined length along the circumference of the lead tube 23. While meeting the requirements for shaft voltage transmission, the conductive element 30 is easy to assemble and disassemble.

[0081] It is understood that having only one conductive element 30 is only one possible implementation. In some embodiments, the number of conductive elements 30 can be multiple. The conductive element 30 is an arc-shaped structure extending a predetermined length along the circumference of the lead tube 23, and multiple conductive elements 30 are distributed at intervals or sequentially along the circumference of the lead tube 23. With the above arrangement, the requirements for shaft voltage transmission can also be met.

[0082] As an optional implementation, the wind turbine generator set provided in this application embodiment includes a generator 20 further comprising an adapter bracket 25, one end of which is connected to the side of the stator 22 away from the housing 11, and the other end of which is connected to a conductive element 30 such that the conductive element 30 abuts against the output shaft 121.

[0083] The wind turbine generator set provided in this application embodiment facilitates the installation of the conductive element 30 by setting the adapter bracket 25, which provides an installation point for the conductive element 30. At the same time, the adapter bracket 25 can provide a holding force to the conductive element 30, so that the conductive element 30 abuts against the lead tube 23, ensuring the electrical contact requirements between the conductive element 30 and the lead tube 23.

[0084] As an optional implementation, in the wind turbine generator provided in this application embodiment, the adapter bracket 25 is arranged around the outer peripheral surface of the lead tube 23, and in the radial Y direction of the lead tube 23, the conductive element 30 is at least partially located between the adapter bracket 25 and the outer peripheral surface and abuts against the outer peripheral surface of the lead tube 23.

[0085] Optionally, the adapter bracket 25 is an overall ring structure. The inner diameter of the adapter bracket 25 is larger than the outer diameter of the lead tube 23, so that there is a gap between the adapter bracket 25 and the outer peripheral surface of the lead tube 23, which is conducive to the installation of the conductive element 30, and at the same time can ensure the contact and electrical connection between the conductive element 30 and the lead tube 23.

[0086] It is understood that setting the inner diameter of the adapter bracket 25 to be larger than the outer diameter of the lead tube 23, and such that the conductive element 30 is at least partially located between the adapter bracket 25 and the outer peripheral surface, is only an optional implementation method, but is not limited to the above method.

[0087] In some embodiments, the adapter bracket 25 and the lead tube 23 can be spaced apart in the axial direction X, away from the shaft end face of the gearbox 10. In the axial direction X, the conductive element 30 is at least partially located between the adapter bracket 25 and the shaft end face and abuts against the shaft end face. With the above arrangement, the conductive element 30 can abut against the shaft end face of the lead tube 23 in the axial direction X, which can also meet the shaft voltage transmission requirements.

[0088] The wind turbine generator set provided in this application embodiment allows the conductive element 30 to be directly connected to a grounding cable, through which the shaft voltage transmitted from the output shaft 121 to the conductive element 30 is directly transmitted to the grounding point. Of course, this is an optional embodiment, but is not limited thereto.

[0089] As an optional implementation, the wind turbine generator set provided in this application includes a stator 22 comprising a stator support 221. The stator support 221 is connected to a grounding cable 70. A transition bracket 25 is electrically connected to the conductive element 30 and the stator support 221, so that the shaft voltage transmitted to the conductive element 30 is sequentially transmitted to the grounding point via the transition bracket 25, the stator support 221, and the grounding cable 70. This arrangement allows the conductive element 30 to share the grounding cable 70 provided on the stator support 221, reducing the number of grounding cables 70 and lowering costs. Simultaneously, it avoids interference with the rotation and power generation of the generator 20 caused by an excessive number of grounding cables 70.

[0090] Optionally, a grounding cable 70 can be connected to the housing 11 of the gearbox 10.

[0091] In some optional embodiments, the wind turbine generator set provided in this application also includes a mounting sleeve 26, which surrounds the lead pipe 23 and is connected to the output shaft 121. The radial dimension D2 of the mounting sleeve 26 is greater than or equal to 5 times the radial dimension D1 of the lead pipe 23. The mounting sleeve 26 is used to install brake components.

[0092] Alternatively, the inner diameter of the mounting sleeve 26 may be greater than or equal to five times the outer diameter of the lead tube 23.

[0093] Optionally, the inner diameter of the mounting sleeve 26 can be larger than the outer diameter of the output shaft 121. The mounting sleeve 26 can be directly connected to the output shaft 121. Of course, in order to avoid interference with the installation of the rotor 21, the mounting sleeve 26 can be connected to the rotor bracket 211 of the rotor 21, and connected to the output shaft 121 through the rotor bracket 211.

[0094] 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.

[0095] The wind turbine generator set provided in this application embodiment, by setting the installation sleeve 26, can facilitate the installation of structures such as brake components and ensure the safety performance of the generator 20.

[0096] Furthermore, since the conductive element 30 is electrically connected to the lead tube 23, it is not necessary to make electrical contact with the mounting sleeve 26. By limiting the ratio between the radial Y dimension of the mounting sleeve 26 and the radial dimension of the lead tube 23, interference of the mounting sleeve 26 with the installation of the conductive element 30 and the adapter bracket 25 can be avoided.

[0097] As an optional implementation, in the wind turbine generator set provided in this application embodiment, the rotor 21 is disposed inside the stator 22, and the stator 22 is connected to the end of the housing 11 facing the generator 20. That is to say, the wind turbine generator set provided in this application embodiment can be of the form of an internal rotor, which is beneficial to the cooperation between the conductive element 30 and the lead pipe 23, and reduces the stroke of the lead pipe 23 per unit time when the wind turbine generator set is working.

[0098] It is understood that the above embodiments of this application are all based on the example of the transmission component 24 including a bearing body 241 for distance description. This is an optional implementation method and is not limited to one.

[0099] Please see Figure 5 As an optional implementation, the wind turbine generator set provided in this application embodiment includes a transmission component 24 comprising two or more bearing bodies 241, which are distributed along the axial direction X of the lead tube 23, and each bearing body 241 is filled with lubricant.

[0100] Optionally, the number of bearing bodies 241 can be two, three or even more, which can be determined according to parameters such as the length of the output shaft 121 and the size of a single bearing body 241 in the axial direction X.

[0101] Optionally, two or more bearing bodies 241 can be spaced apart in the axial direction X, or of course, they can be distributed sequentially.

[0102] The wind turbine generator set provided in this application embodiment includes a transmission component 24 comprising two or more bearing bodies 241, each of which is filled with lubricant. This design enables multi-point support for the output shaft 121 and the lead tube 23, ensuring their coaxiality and improving rotational smoothness. Furthermore, this arrangement ensures multi-point contact between the output shaft 121 and the lead tube 23, guaranteeing the reliability of the electrical connection between them and facilitating shaft voltage transmission.

[0103] The wind turbine generator set provided in this application embodiment changes the original technical path for guiding the shaft voltage on the output shaft 121 to the grounding point, and provides a new technical concept. Instead of having the conductive element 30 abut against the mounting sleeve 26 with a larger diameter and higher rotation speed connected to the output shaft 121, the conductive element 30 abuts against the lead tube 23 with a smaller diameter and lower rotation speed. The conductive element 30 abuts against the lead tube 23 and transmits the shaft voltage. During the same working time, the wind turbine generator set can effectively reduce the sliding distance of the conductive element 30 relative to the lead tube 23, thereby reducing the wear of the conductive element 30, increasing the service life of the conductive element 30, and greatly reducing the maintenance cost of the wind turbine generator set.

[0104] 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 a housing (11), a gear train disposed in the housing (11), and an output shaft (121) connected to the output end of the gear train; A generator (20) includes a rotor (21), a stator (22), a lead tube (23), and a transmission component (24). The rotor (21) is connected to the output shaft (121), the stator (22) is connected to the housing (11) and rotates with the rotor (21), the lead tube (23) extends at least partially into the output shaft (121), and the output shaft (121) is rotated with and electrically connected to the lead tube (23) through the transmission component (24). A conductive element (30) is connected to the stator (22) and abuts against the lead tube (23) to guide the shaft voltage on the output shaft (121) to the ground point via the transmission element (24) and the lead tube (23).

2. The wind turbine generator set according to claim 1, characterized in that, The transmission component (24) includes a bearing body (241) and a lubricant filled in the bearing body (241), the lubricant being a conductor.

3. The wind turbine generator set according to claim 2, characterized in that, The lubricant includes conductive grease and conductive particles mixed in the conductive grease.

4. The wind turbine generator set according to claim 2, characterized in that, The transmission component (24) includes two or more bearing bodies (241) distributed along the axial direction (X) of the lead tube (23), and each bearing body (241) is filled with the lubricant.

5. The wind turbine generator set according to claim 1, characterized in that, The gearbox (10) also includes an input shaft (122) connected to the input end of the gear train, and the lead tube (23) extends into one end of the output shaft (121) and is connected to the input shaft (122) to obtain kinetic energy from the input shaft (122).

6. The wind turbine generator set according to claim 1, characterized in that, In the axial direction (X) of the lead tube (23), the lead tube (23) is at least partially protruding from the output shaft (121) in a direction away from the housing (11) and forming a connecting part (231), and the conductive element (30) abuts against the connecting part (231) and slides with the connecting part (231).

7. The wind turbine generator set according to claim 1, characterized in that, The number of conductive elements (30) is one, and the conductive element (30) is an arc-shaped structure or a ring-shaped structure that extends a predetermined length along the circumference of the lead tube (23).

8. The wind turbine generator set according to claim 1, characterized in that, The number of conductive elements (30) is multiple. Each conductive element (30) is an arc-shaped structure that extends a predetermined length along the circumference of the lead tube (23). Multiple conductive elements (30) are distributed at intervals or successively along the circumference of the lead tube (23).

9. The wind turbine generator set according to claim 1, characterized in that, The generator (20) also includes an adapter bracket (25), one end of which is connected to the side of the stator (22) away from the housing (11), and the other end of which is connected to the conductive element (30) and the conductive element (30) abuts against the output shaft (121).

10. The wind turbine generator set according to claim 9, characterized in that, The adapter bracket (25) is arranged around the outer peripheral surface of the lead tube (23). In the radial (Y) direction of the lead tube (23), the conductive element (30) is at least partially located between the adapter bracket (25) and the outer peripheral surface and abuts against the outer peripheral surface of the lead tube (23). Alternatively, in the axial direction (X) of the lead tube (23), the adapter bracket (25) is spaced apart from the shaft end face of the lead tube (23) away from the gearbox (10), and in the axial direction (X), the conductive element (30) is at least partially located between the adapter bracket (25) and the shaft end face and abuts against the shaft end face.

11. The wind turbine generator set according to claim 9, characterized in that, The stator (22) includes a stator support (221) connected to a grounding cable (70). The adapter (25) is in electrical contact with the conductive element (30) and the stator support (221) so that the shaft voltage transmitted to the conductive element (30) is transmitted to the grounding point in sequence via the adapter (25), the stator support (221) and the grounding cable (70).

12. The wind turbine generator set according to claim 1, characterized in that, The generator (20) further includes a mounting sleeve (26) which surrounds the lead tube (23) and is connected to the output shaft (121). The radial (Y) dimension of the mounting sleeve (26) is greater than or equal to 5 times the radial (Y) dimension of the lead tube (23). The mounting sleeve (26) is used to mount brake components.

13. The wind turbine generator set according to claim 1, characterized in that, The rotor (21) is disposed inside the stator (22), which is connected to one end of the housing (11) facing the generator (20).

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