Wind turbine generator and heat dissipation system and heat dissipation system control method thereof

Abstract

The embodiment of the present application provides a wind turbine generator and a heat dissipation system and a heat dissipation system control method thereof. The wind turbine generator comprises an outer shaft and an inner shaft rotating relative to each other, and the heat dissipation system comprises: a plurality of heat dissipation fins are arranged on the inner surface of the inner shaft in the circumferential direction, and a heat dissipation air duct is formed between adjacent heat dissipation fins, which is used for guiding cooling air into the hub of the wind turbine generator. The heat dissipation system of the embodiment of the present application effectively increases the heat exchange area of the inner shaft, thereby effectively reducing the temperature of the surface of the inner shaft, and then the bearing and the bearing grease can be cooled by heat conduction, thereby effectively reducing the problem of bearing failure caused by excessive pre-tightening force due to overheating, so as to ensure that the wind turbine generator can reach the designed service life.

Description

Technical Field

[0001] This application relates to the field of heat dissipation technology for wind turbine generator sets. Specifically, this application relates to a wind turbine generator set and its heat dissipation system, as well as a control method for the heat dissipation system. Background Technology

[0002] In recent years, global renewable energy utilization has grown by 25% annually, with the power industry leading the way. Wind energy, as a renewable and clean energy source, is being increasingly widely used. A wind turbine is a device that converts wind energy into electrical energy, mainly consisting of a rotor, transmission mechanism, generator, braking mechanism, and tower. With increasingly scarce onshore land resources, wind turbines are trending towards large-megawatt onshore models and offshore models.

[0003] The transmission mechanism of a wind turbine generator set mainly consists of a fixed shaft, a moving shaft, and main bearings. Larger wind turbine generator sets have larger rotor and generator diameters, resulting in heavy loads on the main bearings supporting these components. Combined with complex external wind resource environments, such as wind shear, and prolonged operation at full power, the bearings are subjected to enormous radial and axial forces. Friction generates heat, which accumulates and cannot be effectively dissipated. The viscosity of the bearing grease decreases sharply due to the increased temperature, thinning the lubricating film between the bearing rollers and raceways. If direct metal-to-metal contact occurs, the stress state of the metal deteriorates, and the grease cannot effectively lubricate and protect the bearing. Operating the main bearing at high temperatures increases the probability of failure, severely impacting its service life. As one of the core components of the entire wind turbine generator set, the health and service life of the main bearing are crucial to the overall lifespan and safety of the turbine. Summary of the Invention

[0004] This application addresses the shortcomings of existing methods by proposing a wind turbine generator set, its heat dissipation system, and a heat dissipation system control method to solve the technical problems of poor heat dissipation and service life that cannot meet design requirements in the prior art.

[0005] In the first aspect, embodiments of this application provide a cooling system for a wind turbine generator set. The wind turbine generator set includes an outer shaft and an inner shaft that rotate relative to each other. The cooling system includes: a plurality of cooling fins are arranged circumferentially on the inner surface of the inner shaft, and a cooling air duct is formed between adjacent cooling fins. The cooling air duct is used to guide cooling air to the hub of the wind turbine generator set.

[0006] In one embodiment of this application, the plurality of heat dissipation fins include a plurality of sets of heat dissipation fins, which are evenly distributed on the inner surface of the inner shaft along the circumference of the inner surface, and a heat dissipation air duct is formed between any two adjacent heat dissipation fins in each set of heat dissipation fins.

[0007] In one embodiment of this application, each set of heat dissipation fins is fixedly connected to the inner surface of the inner shaft by a mounting plate, and the mounting plate is fitted to the inner surface of the inner shaft.

[0008] In one embodiment of this application, the inner surface of the inner shaft is provided with a plurality of grooves, the mounting plate is disposed in the corresponding grooves, and the surface of the mounting plate is flush with the inner surface.

[0009] In one embodiment of this application, a plurality of blind holes are provided in the groove, and the mounting plate is fixedly connected to the groove by bolts engaging with the blind holes.

[0010] In one embodiment of this application, the axial dimension of the heat dissipation fins is greater than the radial dimension, and the axial direction is the axial direction of the inner shaft.

[0011] In one embodiment of this application, the heat dissipation fins are in the shape of turbine blades, and a vortex heat dissipation channel is formed between adjacent heat dissipation fins. The extension direction of the vortex heat dissipation channel is at a predetermined angle to the axial direction of the inner shaft.

[0012] In one embodiment of this application, the wind turbine generator cooling system further includes at least one air supply device, the air outlet of the at least one air supply device facing the inner surface of the inner shaft, guiding the cooling air to the hub.

[0013] In one embodiment of this application, the cooling air flows into the hub from the inner shaft and exits the hub through the blade root gap.

[0014] In one embodiment of this application, the wind turbine generator cooling system further includes a controller and a sensor, the sensor being disposed on the inner shaft; the controller is used to control the air supply device to start when it is determined that the sensor detects that the temperature of the inner shaft has reached a predetermined temperature.

[0015] Secondly, embodiments of this application provide a wind turbine generator set, including a wind turbine generator set cooling system as provided in the first aspect, wherein the inner shaft is the moving shaft of the shaft system of the wind turbine generator set.

[0016] In one embodiment of this application, the air supply device is installed at the fixed axis of the wind turbine generator set or inside the nacelle.

[0017] Thirdly, embodiments of this application provide a method for controlling a cooling system of a wind turbine generator set, including the cooling system of the wind turbine generator set as provided in the first aspect, wherein the control method includes:

[0018] When the wind turbine is turned on, it dissipates heat through heat dissipation fins.

[0019] When the inner shaft temperature reaches the predetermined temperature, the air supply device is turned on to dissipate heat from the wind turbine generator set.

[0020] The cooled air is then directed into the wheel hub for further cooling.

[0021] The beneficial technical effects of the technical solutions provided in this application are:

[0022] This embodiment of the application effectively increases the heat exchange area of ​​the inner shaft by setting heat dissipation fins on the inner shaft, thereby effectively reducing the temperature of the inner shaft surface. This allows the bearings and bearing grease to achieve a cooling effect through heat conduction, effectively reducing the problem of bearing failure due to excessive preload caused by overheating, thus ensuring that the wind turbine generator can reach its designed service life. Furthermore, the heat dissipation airflow formed between adjacent fins can also guide cooling air into the hub, cooling the components within the hub. Therefore, the heat dissipation system of this embodiment of the application provides better heat dissipation for the wind turbine generator, effectively preventing malfunctions caused by overheating of components and effectively extending the service life of the wind turbine generator.

[0023] Additional aspects and advantages of this application will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of this application. Attached Figure Description

[0024] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0025] Figure 1 This is a schematic diagram of the structure of a wind turbine generator set provided in an embodiment of this application;

[0026] Figure 2 This application provides a schematic diagram of the structure of a wind turbine generator cooling system.

[0027] Figure 3 This application provides a schematic diagram of the structure of the inner shaft of a wind turbine generator set.

[0028] Figure 4 This is a flowchart illustrating a heat dissipation system control method for a wind turbine generator set, as provided in an embodiment of this application. Detailed Implementation

[0029] This application is described in detail below. Examples of embodiments of this application are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. Furthermore, detailed descriptions of known technologies that are unnecessary for the features of this application are omitted. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0030] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0031] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this application means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or wireless coupling. The term “and / or” as used herein includes all or any units and all combinations of one or more associated listed items.

[0032] First, let's introduce and explain several terms used in this application:

[0033] Wind shear: an atmospheric phenomenon, the change of wind vector (wind direction, wind speed) over horizontal and / or vertical distances in the air;

[0034] Turbine blades: an important component of the turbine section in a gas turbine engine, which can be cooled by internal airflow;

[0035] Forced convection: a type of convective heat transfer, where gas undergoes convection under the influence of external forces;

[0036] Jet fan: A special type of axial flow fan with open inlet and outlet, whose force on the air is "equal in magnitude and opposite in direction" to the force on the support of the jet fan.

[0037] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments.

[0038] A wind turbine generator set consists of several main parts: a tower, a nacelle, a wind turbine generator, a shaft system, and an impeller. The tower primarily serves a supporting function, supporting other components. The nacelle, including the nacelle cover and base, is located at the top of the tower. Different control cabinets are housed within the nacelle. The wind turbine generator includes a rotor and a stator. The shaft system includes a fixed shaft, a driving shaft, and main bearings. The fixed shaft is connected to the base and supports other components. The driving shaft is rotatably mounted on the fixed shaft via the main bearings. The rotor is connected to the driving shaft, and the stator is connected to the fixed shaft. The main bearings can be rolling bearings, including an outer ring, an inner ring, and rolling elements. The impeller includes a hub, blades, and a fairing. The hub is connected to and drives the driving shaft of the wind turbine generator. The blades are mounted on the hub, the fairing is mounted on the hub, and the hub typically also houses the pitch control unit and pitch motor.

[0039] For the shaft system of a wind turbine generator set, the moving shaft can extend into the fixed shaft or be fitted outside the fixed shaft. The one on the outer side of the moving shaft and the one on the inner side is the outer shaft, and the one on the inner side is the inner shaft. In this embodiment, the example of the outer shaft being the fixed shaft, the inner shaft being the moving shaft, and the moving shaft extending into the fixed shaft is used for explanation. The embodiments of this application also apply to the case where the outer shaft is the moving shaft and the inner shaft is the fixed shaft.

[0040] Firstly, embodiments of this application provide a heat dissipation system for a wind turbine generator set, the structural schematic diagram of which is shown below. Figure 1 As shown, the wind turbine generator set includes an outer shaft (not shown in the figure) and an inner shaft 1 that rotate relative to each other. The heat dissipation system includes heat dissipation fins 2. Multiple heat dissipation fins 2 are arranged circumferentially on the inner surface of the inner shaft 1. A heat dissipation air duct 3 is formed between adjacent heat dissipation fins 2. The heat dissipation air duct 3 is used to guide the cooling air to the hub 7 of the wind turbine generator set.

[0041] like Figure 2As shown, the heat dissipation fins 2 can be made of sheet metal plates with good thermal conductivity. They can extend axially along the inner shaft 1, and multiple heat dissipation fins 2 can be arranged circumferentially along the inner surface of the inner shaft 1 to increase the heat exchange area of ​​the inner shaft 1. This effectively reduces the temperature of the inner surface of the inner shaft 1, thereby allowing the bearings and bearing grease to achieve a cooling effect through heat conduction. Preferably, the heat dissipation fins 2 are configured with irregularly shaped concave-convex curved surfaces. A heat dissipation air duct 3 can be formed between adjacent heat dissipation fins 2, and the approximate axial direction of the heat dissipation air duct 3 extends at a predetermined angle to the axial direction of the inner shaft 1. This angle setting allows the heat dissipation air duct 3 to guide cooling air into the hub 7 when the inner shaft 1 is a moving shaft, thereby dissipating heat from the components inside the hub 7, such as the pitch control cabinet 71 and the pitch motor 72. This makes the heat dissipation system of this embodiment of the application more effective in dissipating heat from the wind turbine generator set.

[0042] This embodiment of the application effectively increases the heat exchange area of ​​the inner shaft by setting heat dissipation fins on the inner shaft, thereby effectively reducing the temperature of the inner shaft surface. This allows the bearings and bearing grease to achieve a cooling effect through heat conduction, effectively reducing the problem of bearing failure due to excessive preload caused by overheating, thus ensuring that the wind turbine generator can reach its designed service life. Furthermore, the heat dissipation airflow formed between adjacent fins can also guide cooling air into the hub, cooling the components within the hub. Therefore, the heat dissipation system of this embodiment of the application provides better heat dissipation for the wind turbine generator, effectively preventing malfunctions caused by overheating of components and effectively extending the service life of the wind turbine generator.

[0043] It should be noted that the embodiments of this application do not limit the material and specific arrangement of the heat dissipation fins. For example, they can be made of materials such as steel or aluminum alloy. The embodiments of this application are not limited thereto, and those skilled in the art can adjust the settings according to the actual situation.

[0044] In one embodiment of this application, the plurality of heat dissipation fins 2 include multiple sets of heat dissipation fins, which are evenly distributed circumferentially on the inner surface of the inner shaft 1, and a heat dissipation channel 3 is formed between any two adjacent heat dissipation fins 2 in each set. Figure 2As shown, multiple heat dissipation fins 2 can be evenly distributed on the inner surface of the inner shaft 1 in groups of four. However, the embodiments of this application do not limit the number of heat dissipation fins 2 in each group, and those skilled in the art can adjust the setting according to actual working conditions. Optionally, multiple groups of heat dissipation fins can be staggered in the axial direction to increase the speed of the cooling air flowing through the heat dissipation fins, thereby improving the cooling effect. Alternatively, more than one group of heat dissipation fins can be set in the axial direction to extend the heat dissipation air duct 3, further increase the heat dissipation area of ​​the inner shaft, and further extend the stroke of the vortex formation to increase the wind speed and improve the cooling effect. By adopting the above settings, not only can the overall cost of the heat dissipation system of this application embodiment be saved, but the installation and disassembly of the heat dissipation fins can also be facilitated, thereby effectively improving work efficiency. On the other hand, sensors 6 can be set between two adjacent groups of heat dissipation fins. The grouped design of the heat dissipation fins not only makes the structure of this application embodiment simple and easy to use, but also facilitates the maintenance and repair of the sensors 6.

[0045] In one embodiment of this application, each set of heat dissipation fins is fixedly connected to the inner surface of the inner shaft 1 by a mounting plate 4, and the mounting plate 4 is fitted to the inner surface of the inner shaft 1. Figure 2 As shown, the mounting plate 4 can be a plate-shaped structure made of the same material as the heat dissipation fins 2, and it can be fitted to the inner surface of the inner shaft 1. For example, the mounting plate 4 can have a certain curvature to facilitate fitting with the inner surface of the inner shaft 1. Optionally, the heat dissipation fins 2 and the mounting plate 4 can be integrally molded, or they can be fixedly connected by welding, or they can be directly fixed to the inner shaft 1 by bolts. Such connection methods can avoid the problem of high-temperature detachment of adhesive connections. The embodiments of this application are not limited thereto. By adopting the above design, the installation and disassembly of the heat dissipation fins of the embodiments of this application can be made simpler and faster, which not only improves production efficiency but also reduces manufacturing and use costs.

[0046] However, it should be noted that not all embodiments of this application must include a mounting plate. Heat dissipation fins can also be directly mounted on the inner shaft. The embodiments of this application are not limited thereto, and those skilled in the art can adjust the settings accordingly.

[0047] In one embodiment of this application, the inner surface of the inner shaft 1 is provided with a plurality of grooves 11, and the mounting plate 4 is disposed in the corresponding grooves 11, with the surface of the mounting plate 4 flush with the inner surface. Figure 3As shown, the groove 11 can specifically adopt a rectangular structure with a certain depth. The depth of the groove 11 can correspond to the thickness of the mounting plate 4, or be slightly greater than the depth of the mounting plate 4, so that after the mounting plate 4 is installed in the groove 11, its surface can be flush with the inner surface of the inner shaft 1. With the above configuration, the groove not only limits the position of the heat dissipation fins, but also allows for smoother airflow due to the flushness of the mounting plate with the inner surface, thereby further improving the cooling effect.

[0048] It should be noted that the embodiments of this application do not limit the specific implementation of the groove. For example, it can also adopt other shapes, as long as the groove corresponds to the shape of the mounting plate. The embodiments of this application are not limited thereto.

[0049] In one embodiment of this application, a plurality of blind holes 12 are provided in the groove 11, and the mounting plate 4 is fixedly connected to the inner shaft 1 by bolts engaging with the blind holes 12. Figure 3 As shown, the blind hole 12 may have an internal thread, and the mounting plate 4 can be fixedly connected to the groove 11 by bolts engaging with the blind hole 12. This design makes the mounting plate of this embodiment easier to assemble and disassemble. Furthermore, when maintenance is required on the bolts of the shaft system and hub, the mounting plate can be quickly removed, thereby improving the maintenance efficiency of the wind turbine generator set and consequently increasing its economic benefits.

[0050] It should be noted that the embodiments of this application do not limit the connection method between the groove and the mounting plate, as long as the two are detachable, such as by snap-fit. Therefore, the embodiments of this application are not limited thereto, and those skilled in the art can adjust the settings according to the actual situation.

[0051] In one embodiment of this application, the axial dimension of the heat dissipation fin 2 is greater than its radial dimension, and the axial direction is the axial direction of the inner shaft 1. For example... Figure 2 As shown, the extension direction of the heat dissipation fins 2 can be arranged along the axial direction of the inner shaft 1. For example, the heat dissipation fins 2 can be arranged entirely parallel to the axial direction of the inner shaft 1; or the heat dissipation fins 2 can be arranged obliquely on the inner surface of the inner shaft 1, thereby extending the heat dissipation air duct 3, increasing the incoming flow velocity, and improving the heat dissipation effect. The axial dimension of the heat dissipation fins 2 can be greater than or equal to the radial dimension; its axial dimension can also be less than the radial dimension, in which case more than one set of heat dissipation fins 2 can be arranged in the axial direction. With the above arrangement, the heat dissipation fins not only have a larger heat dissipation area, thereby further improving the heat dissipation effect, but also allow the cooling air to be better guided into the hub, thereby further improving the heat dissipation effect inside the hub.

[0052] It should be noted that the embodiments of this application are not limited to the specific arrangement of the heat dissipation fins. For example, in some other embodiments, the heat dissipation fins are arranged in a way that is not the same length in the axial direction, or the heat dissipation fins can be arranged in an alternating manner in the axial installation position, etc. Therefore, the embodiments of this application do not limit this, and those skilled in the art can adjust the arrangement according to the actual situation.

[0053] In one embodiment of this application, the heat dissipation fins 2 are turbine blade-shaped, and a vortex heat dissipation channel 31 is formed between adjacent heat dissipation fins 2. The extending direction of the vortex heat dissipation channel 31 forms a predetermined angle with the axial direction of the inner shaft 1. Figure 2 As shown, the heat dissipation fins 2 can be arranged in a turbine blade shape, and a vortex cooling air duct 31 can be formed between adjacent heat dissipation fins 2. When the inner shaft 1 is the moving shaft and the wind turbine generator is running, the heat dissipation fins 2 rotate to form a vortex of cooling air, thereby increasing the incoming air velocity and allowing more cooling air to be drawn in to further improve the cooling effect on the inner shaft. In addition, the vortex cooling air duct 31 extends at a predetermined angle to the axial direction of the inner shaft 1, further guiding the cooling air. The higher-velocity vortex is guided to the hub through the turbine cooling air duct 31, eliminating the need for a dedicated cooling air guiding structure, simplifying the overall structural design, and further improving the cooling effect on the components inside the hub. The cooling air travels from the inner shaft to the hub and can eventually be squeezed out of the hub through the gaps at the blade roots.

[0054] In one embodiment of this application, at least one air supply device 5 is further included, the air outlet of the at least one air supply device 5 facing the inner surface of the inner shaft 1, guiding the cooling air to the hub 7. Figure 1 As shown, the air supply device 5 can be a blower installed inside the nacelle. The air outlet of the air supply device 5 can face the inner surface of the inner shaft 1. Cooling air is delivered from inside the nacelle to the heat dissipation fins 2 through the air supply device 5. By increasing the air volume and reducing the air resistance, the heat dissipation effect of the heat dissipation system implemented in this application can be further improved. On the other hand, since the air supply device is set inside the nacelle, the cooling air is cleaner, avoiding the cooling air taken from the bottom of the tower in the prior art. Especially for offshore units and cooling air in humid land areas, the cooling air is relatively humid, thus causing damage to the internal components of the wind turbine generator set. The heat dissipation system of this application embodiment can effectively avoid the damage caused by humid cooling air to the internal electrical control components and mechanical parts of the wind turbine generator set, thereby effectively improving the service life of the wind turbine generator set using the heat dissipation system of this application embodiment. It should be noted that the embodiments of this application do not limit the number and specific installation position of the air supply device. Those skilled in the art can adjust the setting according to the actual working conditions.

[0055] In one embodiment of this application, the air supply device 5 is an axial flow fan or a jet fan. The cooling air delivered by the air supply device 5 flows into the hub 7 from the inner shaft 1 and exits the hub 7 through the blade root gaps. By adopting the above design, not only can the air volume and air supply efficiency of the cooling air be increased, but the usage and maintenance costs can also be effectively reduced.

[0056] In one embodiment of this application, a controller and a sensor 6 are further included. The sensor 6 is disposed on the inner shaft 1. The controller is used to control the air supply device 5 to start when it is determined that the sensor 6 has detected that the temperature of the inner shaft 1 has reached a predetermined temperature. Figure 2 As shown, sensor 6 can be disposed on the inner surface of inner shaft 1. Specifically, multiple countersunk holes can be formed on inner shaft 1, and sensor 6 can be disposed in the countersunk holes by means of screwing or snap-fit. This embodiment of the application is not limited thereto. Controller (not shown in the figure) can be electrically connected to air supply device 5 and sensor 6 wirelessly or by wire. In actual use, sensor 6 can detect the temperature of inner shaft 1 and send the temperature to controller. When controller determines that the temperature of inner shaft 1 has reached a predetermined temperature, controller controls air supply device 5 to start, and the wind turbine generator is cooled by forced convection. Adopting the above design not only improves the heat dissipation effect of the heat dissipation system of this embodiment of the application, but also effectively reduces the operating cost; in addition, it can improve the automation level of the heat dissipation system of this embodiment of the application, thereby ensuring that the wind turbine generator operates in a suitable environment and effectively reducing the failure rate of the wind turbine generator due to overheating.

[0057] Secondly, based on the same inventive concept, the embodiments of this application provide a wind turbine generator set, which may include the wind turbine generator set heat dissipation system as provided in the first aspect, wherein the inner shaft 1 of the wind turbine generator set is the moving shaft of the wind turbine generator set's shaft system.

[0058] Reference Figure 1 As shown, the inner shaft 1 can be the moving shaft of the wind turbine generator set. With the above design, the heat dissipation fins 2 can form a vortex of cooling air during the rotation of the moving shaft. Through forced convection and increased heat exchange area, not only can the inner shaft 1 be cooled better, but the cooling effect of various components in the hub can also be improved.

[0059] Optionally, the air supply device 5 is installed at the fixed axis of the wind turbine generator set or inside the nacelle. The air supply device 5 is set on the fixed axis, which can also avoid the method of drawing cooling air from the bottom of the tower in the prior art, and thus avoid damage to the components inside the wind turbine generator set by the humid cooling air.

[0060] Thirdly, based on the same inventive concept, embodiments of this application provide a method for controlling the cooling system of a wind turbine generator set, which may include the cooling system of the wind turbine generator set as provided in the first aspect. A flowchart of this control method is shown below. Figure 4 As shown, the control method includes:

[0061] S401: When the wind turbine generator set is turned on, the cooling fins are used to dissipate heat from the wind turbine generator set.

[0062] When the wind turbine generator starts running, the sensor detects that the temperature of the main bearing in the shaft system has not yet reached a relatively high temperature. At this time, the heat dissipation fins alone can dissipate heat from the inner shaft 1 of the shaft system.

[0063] S402: When the inner shaft temperature reaches the predetermined temperature, the air supply device is turned on to dissipate heat from the wind turbine generator set.

[0064] When the sensor measures that the temperature of the inner shaft 1 reaches or exceeds the predetermined temperature, the controller controls the air supply device to be turned on for forced cooling. After the air supply device is turned on, the cooling air is guided to the heat dissipation fins, which can force heat dissipation of the shaft system, thereby further improving the heat dissipation effect.

[0065] S403: The air cooled by the above heat is introduced into the wheel hub for heat dissipation.

[0066] The air supply device is preferably installed inside the nacelle. The air supply device forces and quickly delivers the cooling air from the inner shaft 1 through the heat dissipation fins into the hub, increasing the cooling air volume, accelerating the cooling cycle, and enabling the cooling air to cool the relevant heat-generating equipment inside the hub. Finally, the air is discharged to the outside of the wind turbine generator through the gaps at the blade root.

[0067] Specific embodiments of this control method can be found in the description of the heat dissipation system in the first aspect above, and will not be repeated here.

[0068] By applying the embodiments of this application, at least the following beneficial effects can be achieved:

[0069] This embodiment of the application effectively increases the heat exchange area of ​​the inner shaft by setting heat dissipation fins on the inner shaft, thereby effectively reducing the temperature of the inner shaft surface. This allows the bearings and bearing grease to achieve a cooling effect through heat conduction, effectively reducing the problem of bearing failure due to excessive preload caused by overheating, thus ensuring that the wind turbine generator can reach its designed service life. Furthermore, the heat dissipation airflow formed between adjacent fins can also guide cooling air into the hub, cooling the components within the hub. Therefore, the heat dissipation system of this embodiment of the application provides better heat dissipation for the wind turbine generator, effectively preventing malfunctions caused by overheating of components and effectively extending the service life of the wind turbine generator.

[0070] Those skilled in the art will understand that the steps, measures, and solutions in the various operations, methods, and processes discussed in this application can be alternated, modified, combined, or deleted. Furthermore, other steps, measures, and solutions in the various operations, methods, and processes discussed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted. Furthermore, steps, measures, and solutions in the prior art that are similar to those disclosed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted.

[0071] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0072] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0073] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0074] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0075] It should be understood that although the steps in the flowcharts of the accompanying figures are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the accompanying figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0076] The above description is only a partial embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A cooling system for a wind turbine generator set, the wind turbine generator set comprising an outer shaft and an inner shaft (1) that rotate relative to each other, characterized in that, The heat dissipation system includes heat dissipation fins (2). Multiple heat dissipation fins (2) are arranged circumferentially on the inner surface of the inner shaft (1). A heat dissipation air duct (3) is formed between adjacent heat dissipation fins (2). The inner shaft (1) is a moving shaft. Under the rotation of the inner shaft (1), the heat dissipation air duct (3) is used to guide the cooling air to the hub (7) of the wind turbine generator set. The plurality of heat dissipation fins (2) include multiple sets of heat dissipation fins. Each set of heat dissipation fins is fixedly connected to the inner surface of the inner shaft (1) by a mounting plate (4). The mounting plate (4) is fitted to the inner surface of the inner shaft (1), or the heat dissipation fins are directly mounted on the inner surface of the inner shaft (1). The heat dissipation fins (2) are in the shape of turbine blades, and a vortex heat dissipation channel (31) is formed between adjacent heat dissipation fins (2).

2. The wind turbine generator cooling system as described in claim 1, characterized in that, The multiple sets of heat dissipation fins are evenly distributed on the inner surface of the inner shaft (1) along the circumference of the inner surface, and a heat dissipation air duct (3) is formed between any two adjacent heat dissipation fins (2) in each set of heat dissipation fins.

3. The wind turbine generator cooling system as described in claim 1, characterized in that, The inner surface of the inner shaft (1) is provided with a plurality of grooves (11), and the mounting plate (4) is disposed in the corresponding grooves (11), and the surface of the mounting plate (4) is flush with the inner surface.

4. The wind turbine generator cooling system as described in claim 3, characterized in that, The groove (11) is provided with a plurality of blind holes (12), and the mounting plate (4) is fixedly connected to the groove (11) by bolts engaging with the blind holes (12).

5. The wind turbine generator cooling system as described in claim 1, characterized in that, The axial dimension of the heat dissipation fins (2) is greater than the radial dimension, and the axial dimension is the axial dimension of the inner shaft (1).

6. The wind turbine generator cooling system as described in claim 1, characterized in that, The extension direction of the vortex cooling duct (31) is at a predetermined angle to the axial direction of the inner shaft (1).

7. The wind turbine generator cooling system as described in claim 1, characterized in that, It also includes at least one air supply device (5), the air outlet of which faces the inner surface of the inner shaft (1) to guide the cooling air to the hub (7).

8. The wind turbine generator cooling system as described in claim 7, characterized in that, The cooling air flows into the hub (7) from the inner shaft (1) and exits the hub (7) through the blade root gap.

9. The wind turbine generator cooling system as described in claim 7, characterized in that, It also includes a controller and a sensor (6), the sensor (6) being disposed on the inner shaft (1); the controller is used to control the air supply device (5) to start when it is determined that the sensor (6) detects that the temperature of the inner shaft (1) has reached a predetermined temperature.

10. A wind turbine generator set, characterized in that, The wind turbine generator cooling system includes any one of claims 1 to 9, characterized in that the inner shaft (1) is the moving shaft of the shaft system of the wind turbine generator.

11. The wind turbine generator set as described in claim 10, characterized in that, The air supply device (5) is installed at the fixed axis of the wind turbine generator set or inside the nacelle.

12. A control method for the heat dissipation system of a wind turbine generator set, characterized in that, Including the wind turbine generator cooling system as described in any one of claims 7-9, the control method includes: When the wind turbine generator is turned on, the wind turbine generator is cooled by the heat dissipation fins (2); When the temperature of the inner shaft (1) reaches the predetermined temperature, the air supply device (5) is turned on to dissipate heat from the wind turbine generator set; The cooled air is introduced into the wheel hub (7) for further cooling.

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