本申请要求申请日为2019年4月16日的中国专利申请CN201910303376.2的优先权。本申请引用上述中国专利申请的全文。This application claims the priority of the Chinese patent application CN201910303376.2 whose filing date is April 16, 2019. This application quotes the full text of the aforementioned Chinese patent application.
本发明涉及风力发电领域，特别涉及一种风力发电机组。The invention relates to the field of wind power generation, in particular to a wind power generating set.
近年来，风力发电机组大型化的趋势日益清晰，单机容量的增加对发电机轴承的尺寸、性能、可靠性都提出了更高的要求。轴承设计中的关键一环是解决其运行时的散热问题，这对于大型风力发电机组的挑战更为严峻，因为轴承的体积变大、受到的载荷增加，意味着轴承发热量的进一步提升。为了保证轴承能够在其设计寿命内正常运行，通常不仅要将轴承主要部件的运行温度保持在限值以内，还要将轴承内外圈的温差控制在一定范围内。In recent years, the trend of large-scale wind turbines has become increasingly clear, and the increase in single-machine capacity has put forward higher requirements on the size, performance, and reliability of generator bearings. The key part of bearing design is to solve the heat dissipation problem during operation, which is more severe for large-scale wind turbines, because the volume of the bearing becomes larger and the load received increases, which means that the heat generation of the bearing is further increased. In order to ensure the normal operation of the bearing during its design life, it is usually necessary to not only keep the operating temperature of the main components of the bearing within the limit, but also to control the temperature difference between the inner and outer rings of the bearing within a certain range.
现有的一种常用的轴承冷却方法是在轴承内圈上设置水冷管或将冷却空气引导至内圈附近，从而将轴承产生的热量主要经由内圈耗散，而轴承外圈会被设置成不暴露在外界空气中且不具有主动冷却装置，导致外圈缺乏有效的冷却。因此，采用此类冷却方式通常难以有效地控制内外圈温差。例如，当高温环境下，将内外圈温度均冷却至70℃以下时，内圈温度可能会比外圈温度低10℃以上。另一种轴承冷却方法是将轴承外圈设置成完全暴露在外界空气中，在这种情况下，外圈的冷却效果将得到较大的改善，但是仍然明显的依赖于局部几何。这种方式面临的一大问题是雨水能够无阻挡的落入至外圈表面，大大增加轴承腐蚀的风险。此外，这种方式的外圈冷却不具备可控性，在低温环境下可能会导致外圈甚至整个轴承系统过量冷却。A common existing bearing cooling method is to install a water-cooled tube on the inner ring of the bearing or guide the cooling air to the vicinity of the inner ring, so that the heat generated by the bearing is mainly dissipated through the inner ring, and the outer ring of the bearing is set to It is not exposed to outside air and has no active cooling device, resulting in a lack of effective cooling of the outer ring. Therefore, it is often difficult to effectively control the temperature difference between the inner and outer rings using this type of cooling method. For example, when the temperature of the inner and outer rings is cooled to below 70°C in a high temperature environment, the temperature of the inner ring may be more than 10°C lower than the temperature of the outer ring. Another bearing cooling method is to set the outer ring of the bearing to be completely exposed to the outside air. In this case, the cooling effect of the outer ring will be greatly improved, but still obviously depends on the local geometry. A major problem faced by this approach is that rainwater can fall onto the outer ring surface unimpeded, which greatly increases the risk of bearing corrosion. In addition, the outer ring cooling in this way is not controllable, and may cause excessive cooling of the outer ring or even the entire bearing system in a low temperature environment.
发明内容Summary of the invention
本发明要解决的技术问题是为了克服现有技术中的轴承外圈冷却效果相对较差、难以实现冷却可控的缺陷，提供一种风力发电机组。The technical problem to be solved by the present invention is to overcome the disadvantages of relatively poor cooling effect of the bearing outer ring in the prior art and difficulty in achieving controllable cooling, and to provide a wind power generator set.
本发明是通过下述技术方案来解决上述技术问题：The present invention solves the above technical problems through the following technical solutions:
一种风力发电机组，其包括轴承系统、转子、轮毂和导流罩，所述导流罩位于所述轮毂的外部，所述轴承系统包括轴承外圈和轴承内圈，所述转子和所述轮毂连接于所述轴承系统的转动部分，其特点在于，所述风力发电机组还包括轴承冷却装置，所述轴承冷却装置包括若干开口，所述开口位于所述导流罩的附近或所述导流罩上，所述导流罩与所述轮毂之间的空间通过所述开口与外界连通，所述轴承系统的至少一部分暴露于所述空间内，冷却空气可通过从所述开口处流入所述空间来冷却所述轴承系统的至少一部分。A wind power generator set, which includes a bearing system, a rotor, a hub, and a deflector, the deflector is located outside the hub, the bearing system includes a bearing outer ring and a bearing inner ring, the rotor and the The hub is connected to the rotating part of the bearing system, and is characterized in that the wind turbine generator set further includes a bearing cooling device, the bearing cooling device includes a plurality of openings, the openings are located near the deflector or the deflector On the flow cover, the space between the flow cover and the hub communicates with the outside through the opening, at least a part of the bearing system is exposed in the space, and cooling air can flow into the space from the opening. The space is used to cool at least a part of the bearing system.
较佳地，所述导流罩与所述转子之间设置有所述开口，为第一开口，所述导流罩与所述风力发电机组的叶片之间设置有所述开口，为第二开口。所述开口是为了使空腔内的空气与外界空气能够形成对流。Preferably, the opening is provided between the wind deflector and the rotor, which is the first opening, and the opening is provided between the wind deflector and the blades of the wind turbine, which is the second opening. Open up. The opening is to enable the air in the cavity and the outside air to form convection.
较佳地，所述轴承冷却装置包括驱动风扇装置，所述驱动风扇装置位于两个所述叶片的根部之间或所述叶片的根部与所述转子之间，所述驱动风扇装置固定于所述轮毂的外表面。所述驱动风扇装置可以使进入空腔的外界空气量可以进一步提升。Preferably, the bearing cooling device includes a drive fan device located between the roots of the two blades or between the roots of the blades and the rotor, and the drive fan device is fixed to the The outer surface of the hub. The driving fan device can further increase the amount of outside air entering the cavity.
较佳地，所述驱动风扇装置包括驱动风扇和驱动控制装置，所述驱动控制装置位于所述驱动风扇上，用于控制所述驱动风扇的转速。所述驱动控制装置通过控制驱动风扇的转速，使得进入轴承外圈附近的风量可调，进而调节轴承冷却装置的冷却效率。Preferably, the driving fan device includes a driving fan and a driving control device, and the driving control device is located on the driving fan and is used for controlling the rotation speed of the driving fan. The drive control device controls the rotation speed of the drive fan so that the air volume entering the vicinity of the outer ring of the bearing is adjustable, thereby adjusting the cooling efficiency of the bearing cooling device.
较佳地，所述导流罩的表面有第三开口，所述第三开口靠近所述驱动风扇装置，用于降低外界空气进入和离开所述导流罩与所述轮毂之间空间的阻力。所述第三开口可以加速空腔内的空气快速排出，即可使所述轴承外圈附近的空气在由所述驱动风扇装置抽取过后马上排出。Preferably, the surface of the air deflector has a third opening, and the third opening is close to the driving fan device and is used to reduce the resistance of outside air entering and leaving the space between the air deflector and the hub . The third opening can accelerate the rapid discharge of the air in the cavity, that is, the air near the outer ring of the bearing can be discharged immediately after being drawn by the driving fan device.
较佳地，所述轴承冷却装置还包括至少一个导流结构，所述导流结构的截面为“L”形，所述导流结构固定于所述导流罩的内表面。Preferably, the bearing cooling device further includes at least one diversion structure, the cross section of the diversion structure is "L" shaped, and the diversion structure is fixed to the inner surface of the diversion cover.
较佳地，所述导流结构的一端为固定端，所述固定端固定于所述导流罩的内表面上，所述固定端靠近所述第一开口处，所述导流结构的弯折处靠近所述轴承外圈，所述导流结构与所述转子和所述轮毂之间形成空气导流通路，所述空气导流通路用于引导外界空气流过所述轴承外圈、所述轮毂与部分所述转子的暴露于所述空气导流通路上的表面，降低所述轴承外圈、所述轮毂与所述转子的温度。Preferably, one end of the diversion structure is a fixed end, the fixed end is fixed on the inner surface of the diversion cover, and the fixed end is close to the first opening. The fold is close to the outer ring of the bearing, and an air diversion passage is formed between the guide structure and the rotor and the hub. The air diversion passage is used to guide the outside air to flow through the outer ring of the bearing and the hub. The surface of the hub and part of the rotor exposed to the air flow path reduces the temperature of the bearing outer ring, the hub and the rotor.
较佳地，所述导流结构包括导流直板和导流曲板，所述导流直板和所述导流曲板的一端连接，所述导流直板与所述转子的靠近所述风力发电机组的叶片的一侧端面平行，所述导流曲板与所述轮毂的外表面平行。Preferably, the deflector structure includes a deflector straight plate and a deflector curved plate, the deflector straight plate is connected to one end of the deflector curved plate, and the deflector straight plate is close to the rotor of the wind power generator. One side of the blades of the unit is parallel, and the deflector is parallel to the outer surface of the hub.
较佳地，所述导流直板与所述转子的靠近所述风力发电机组的叶片的一侧端面之间的距离不大于30厘米，所述导流曲板与所述轮毂的外表面之间的距离不大于30厘米，通过所述空气导流通路的外界空气的流速大于1m/s。Preferably, the distance between the deflector straight plate and the end surface of the rotor close to the blade of the wind turbine is not more than 30 cm, and the deflector plate and the outer surface of the hub The distance between the two is not more than 30 cm, and the flow velocity of the outside air passing through the air guide passage is more than 1 m/s.
较佳地，所述轴承冷却装置还包括至少一个导流结构，所述导流结构的一端固定于所述轮毂的外表面，所述导流结构与所述轮毂连接的位置处设置有导流开孔，所述导流开孔均匀分布于所述导流结构上。Preferably, the bearing cooling device further includes at least one diversion structure, one end of the diversion structure is fixed to the outer surface of the hub, and a diversion structure is provided at a position where the diversion structure is connected to the hub. Openings, the diversion openings are evenly distributed on the diversion structure.
较佳地，所述导流结构与所述转子的靠近所述风力发电机组的叶片的一侧端面之间的距离不大于30厘米。Preferably, the distance between the flow guide structure and the end surface of the rotor close to the blade of the wind turbine generator set is not greater than 30 cm.
较佳地，所述轴承冷却装置还包括冷却风扇装置，所述冷却风扇装置安装于所述轮毂的外表面或所述导流罩的内表面，所述冷却风扇装置的出风方向朝向所述轴承外圈，所述冷却风扇装置靠近所述轴承外圈，与所述轴承外圈之间的距离不大于30厘米，所述冷却风扇装置用于加大所述轴承外圈附近的空气流速，加强所述轴承外圈附近的局部对流换热，降低所述轴承外圈的温度。Preferably, the bearing cooling device further includes a cooling fan device, the cooling fan device is installed on the outer surface of the hub or the inner surface of the deflector, and the air outlet direction of the cooling fan device faces the The outer ring of the bearing, the cooling fan device is close to the outer ring of the bearing, and the distance from the outer ring of the bearing is not more than 30 cm, and the cooling fan device is used to increase the air flow rate near the outer ring of the bearing, Strengthen the local convection heat exchange near the outer ring of the bearing, and reduce the temperature of the outer ring of the bearing.
较佳地，所述冷却风扇装置在所述轮毂的外表面或所述导流罩的内表面 沿所述轮毂或所述导流罩的周向均匀排布。Preferably, the cooling fan device is evenly arranged on the outer surface of the hub or the inner surface of the flow deflector along the circumferential direction of the hub or the flow deflector.
本发明的积极进步效果在于：The positive and progressive effects of the present invention are:
该风力发电机组通过在导流罩和轮毂之间设置轴承冷却装置，加大轴承外圈表面的空气对流，加速空气与轴承外圈表面的热交换，加强了轴承外圈的冷却效果，并且轴承内圈和外圈的冷却系统相互独立，且各自具备一定的可调性，从而能够进一步通过控制设备有效地控制内外圈温差。因此，轴承各部件会具有更加一致的热变形程度，从而改善轴承工作状况并延长轴承寿命，而且该轴承冷却装置结构简单，安装安全方便，易于实施和使用。The wind turbine generator sets a bearing cooling device between the deflector and the hub to increase the air convection on the bearing outer ring surface, accelerate the heat exchange between the air and the bearing outer ring surface, and enhance the cooling effect of the bearing outer ring. The cooling systems of the inner ring and the outer ring are independent of each other, and each has a certain degree of adjustability, so that the temperature difference between the inner and outer rings can be further effectively controlled by the control device. Therefore, each component of the bearing will have a more consistent degree of thermal deformation, thereby improving the working condition of the bearing and prolonging the life of the bearing, and the bearing cooling device has a simple structure, is safe and convenient to install, and is easy to implement and use.
附图说明Description of the drawings
图1为本发明实施例1的风力发电机组的结构示意图。Fig. 1 is a schematic diagram of the structure of a wind turbine generator according to Embodiment 1 of the present invention.
图2为本发明实施例2的风力发电机组的结构示意图。Fig. 2 is a schematic diagram of the structure of a wind power generating set according to Embodiment 2 of the present invention.
附图标记说明：Description of reference signs:
轴承外圈 11Bearing outer ring 11
轴承内圈 12Bearing inner ring 12
转子 2Rotor 2
轮毂 3Wheel 3
导流罩 4Shroud 4
叶片 5Blade 5
驱动风扇装置 61Drive fan unit 61
导流结构 62Diversion structure 62
冷却风扇装置 63Cooling fan unit 63
第一开口 71First opening 71
第二开口 72Second opening 72
第三开口 73Third opening 73
气流 8Airflow 8
下面举两个较佳实施例，并结合附图来更清楚完整地说明本发明。Two preferred embodiments are given below to illustrate the present invention more clearly and completely in conjunction with the accompanying drawings.
如图1所示，本发明提供一种风力发电机组，其包括有轴承系统、转子2、轮毂3和导流罩4，轴承系统包括轴承外圈11和轴承内圈12，转子2连接于轴承系统的转动部分，本实施例中即为轴承外圈11，轮毂3连接于轴承外圈11。轮毂3的外侧设置有导流罩4，从而在轮毂3与导流罩4之间形成空腔。轴承外圈11、转子2和轮毂3的一部分表面暴露在空腔内的空气中。除了一些必要的小缝隙和开口，空腔和轮毂3内的空间基本不连通，从而阻止未经处理的空气进入风力发电机组的机舱和发电机内部。在本实施例中可采用轮毂盖板来实现空腔和风力发电机组的机舱和发电机内部的进一步不连通。该风力发电机组还包括有轴承冷却系统，其用于对轴承外圈11、轮毂3和转子2进行冷却。As shown in Figure 1, the present invention provides a wind turbine generator set, which includes a bearing system, a rotor 2, a hub 3, and a shroud 4. The bearing system includes a bearing outer ring 11 and a bearing inner ring 12, and the rotor 2 is connected to the bearing The rotating part of the system is the bearing outer ring 11 in this embodiment, and the hub 3 is connected to the bearing outer ring 11. An air deflector 4 is provided on the outer side of the hub 3 so as to form a cavity between the hub 3 and the air deflector 4. Part of the surface of the bearing outer ring 11, the rotor 2 and the hub 3 is exposed to the air in the cavity. Except for some necessary small gaps and openings, the cavity and the space in the hub 3 are basically disconnected, thereby preventing untreated air from entering the nacelle of the wind turbine generator and the interior of the generator. In this embodiment, a hub cover can be used to realize further disconnection between the cavity and the nacelle of the wind turbine generator and the interior of the generator. The wind power generator set also includes a bearing cooling system, which is used to cool the bearing outer ring 11, the hub 3, and the rotor 2.
轴承冷却装置包括有多个开口，这些开口分别位于导流罩4与转子2之间、导流罩4与叶片5之间及导流罩4的表面，这些开口连通空腔与外界，继而形成多条换热气流的冷却路径，以使得空腔内的空气与外界空气能够形成对流，降低空腔内部的温度。具体包括了导流罩4和转子2的连接处的第一开口71、导流罩4与风力发电机组的叶片5之间的第二开口72。第一开口71连通导流罩4与转子2之间的空间与外界，第二开口72连通导流罩4与轮毂3之间的空间与外界。这些开口的尺寸较小，且具有适当转折密封，开口朝向非迎风侧，从而使得一定量的外界空气气流8能够从这些开口进入和离开空腔，而又可减少雨水的进入。The bearing cooling device includes a plurality of openings. These openings are respectively located between the deflector 4 and the rotor 2, between the deflector 4 and the blades 5, and on the surface of the deflector 4. These openings connect the cavity and the outside to form There are multiple cooling paths for the heat exchange airflow, so that the air in the cavity and the outside air can form convection, and the temperature inside the cavity is reduced. Specifically, it includes a first opening 71 at the junction of the wind deflector 4 and the rotor 2 and a second opening 72 between the wind deflector 4 and the blade 5 of the wind turbine. The first opening 71 communicates the space between the flow deflector 4 and the rotor 2 and the outside, and the second opening 72 communicates the space between the flow deflector 4 and the hub 3 and the outside. These openings are small in size and have proper turning and sealing. The openings face the non-windward side, so that a certain amount of outside air flow 8 can enter and leave the cavity through these openings, while reducing the entry of rainwater.
在空腔的内部、轮毂3的外表面处设置有驱动风扇装置61，以使进入空腔的外界空气量可以进一步提升。优选地，将驱动风扇装置61设置于位于两个风力发电机组的叶片5根部之间的轮毂3上，驱动风扇装置61随轮毂 3一起转动。在其他的实施例中，也可在风力发电机组的叶片5的根部与转子2之间的轮毂3上安装驱动风扇装置61，以达到更好的对流换热效果。驱动风扇装置61由驱动风扇和驱动控制装置构成，其频率具有一定可调性。驱动控制装置安装在驱动风扇上，用于控制驱动风扇的转速，从而使得进入轴承外圈11附近的风量可调。优选地，也可在轴承外圈11上安装温度传感器，驱动控制装置设置为与温度传感器连接，从而可依照轴承外圈11上的温度传感器测量值进行调节。具体如何根据温度传感器的测量值进行调节属于现有技术，因此在此不再赘述。A driving fan device 61 is provided inside the cavity and on the outer surface of the hub 3 so that the amount of outside air entering the cavity can be further increased. Preferably, the driving fan device 61 is arranged on the hub 3 between the roots of the blades 5 of the two wind turbines, and the driving fan device 61 rotates with the hub 3. In other embodiments, a driving fan device 61 may also be installed on the hub 3 between the roots of the blades 5 of the wind turbine generator set and the rotor 2 to achieve a better convective heat exchange effect. The driving fan device 61 is composed of a driving fan and a driving control device, the frequency of which is adjustable. The drive control device is installed on the drive fan, and is used to control the speed of the drive fan, so that the air volume entering the vicinity of the bearing outer ring 11 is adjustable. Preferably, a temperature sensor can also be installed on the outer ring 11 of the bearing, and the drive control device is set to be connected with the temperature sensor, so that adjustment can be made according to the temperature sensor measurement value on the outer ring 11 of the bearing. The specific adjustment based on the measured value of the temperature sensor belongs to the prior art, so it will not be repeated here.
为了加速空腔内的空气快速排出，可在靠近驱动风扇装置61的导流罩4表面设置第三开口73，以使轴承外圈11附近的空气在由驱动风扇装置61抽取过后马上排出空腔，即降低外界空气进入和离开导流罩4与轮毂3之间的空间的阻力，使更多外界空气流经所述轴承外圈11和所述轮毂3的表面。第三开口73的设置方式及规格与导流罩4表面的其他开口相同。In order to accelerate the rapid discharge of air in the cavity, a third opening 73 can be provided on the surface of the shroud 4 near the driving fan device 61, so that the air near the bearing outer ring 11 will be discharged from the cavity immediately after being drawn by the driving fan device 61 , That is, the resistance of outside air entering and leaving the space between the deflector 4 and the hub 3 is reduced, so that more outside air flows through the bearing outer ring 11 and the surface of the hub 3. The arrangement and specifications of the third opening 73 are the same as other openings on the surface of the air deflector 4.
在导流罩4的内侧设置有导流结构62，其为该轴承冷却装置的另一部分。该导流结构62的截面为“L”形，其一端为固定端，固定于导流罩4的内表面上，固定端靠近第一开口71，该导流结构62的弯折处靠近轴承外圈11。在其他实施例中，也可设置导流结构62为一平板，平板的一端固定于轮毂3的表面，并沿固定位置的附近开设均匀分布的导流开孔，达到同样的导流效果。该截面为“L”形的导流结构62包括导流直板和导流曲板，导流直板和导流曲板的一端相连接，导流直板与转子2的靠近风力发电机组的叶片5的一侧端面平行，导流曲板与轮毂3的外表面平行，即导流结构62与转子2和轮毂3之间形成空气导流通路，用于引导外界空气流经该空气导流通路，从而使得空气气流8可以以较高的速度流过转子2、轴承外圈11和轮毂3的部分表面，降低转子2、轴承外圈11和轮毂3的表面温度。作为一种替代的方案，导流结构62也可设置成其他的角度。A flow guide structure 62 is provided on the inner side of the flow guide cover 4, which is another part of the bearing cooling device. The cross section of the diversion structure 62 is an "L" shape, one end is a fixed end, which is fixed on the inner surface of the diversion cover 4, the fixed end is close to the first opening 71, and the bend of the diversion structure 62 is close to the outside of the bearing Circle 11. In other embodiments, the diversion structure 62 can also be a flat plate, one end of the flat plate is fixed on the surface of the hub 3, and evenly distributed diversion openings are opened near the fixed position to achieve the same diversion effect. The guide structure 62 with an "L" cross-section includes a straight guide plate and a curved guide plate. One end of the straight guide plate and the guide curved plate are connected. The guide straight plate is connected to the rotor 2 near the blade 5 of the wind turbine. One side of the end surface is parallel, and the deflector plate is parallel to the outer surface of the hub 3, that is, an air diversion passage is formed between the diversion structure 62 and the rotor 2 and the hub 3 for guiding the outside air to flow through the air diversion passage, thereby The air flow 8 can flow over part of the surface of the rotor 2, the bearing outer ring 11 and the hub 3 at a higher speed, and the surface temperature of the rotor 2, the bearing outer ring 11 and the hub 3 is reduced. As an alternative solution, the flow guiding structure 62 can also be arranged at other angles.
优选地，导流直板与转子2的端面之间的距离不大于30厘米，导流曲 板与轮毂3的外表面之间的距离不大于30厘米，即达到通过该空气导流通路的外界空气的流速大于1m/s的效果。在此实施例中，两距离均设置为30厘米。Preferably, the distance between the straight deflector and the end surface of the rotor 2 is not more than 30 cm, and the distance between the deflector and the outer surface of the hub 3 is not more than 30 cm, that is, to reach the outside air passing through the air diversion passage The flow velocity is greater than 1m/s. In this embodiment, both distances are set to 30 cm.
当驱动风扇装置61进行工作时，可抽取外界的空气，使气流8快速通过该空气导流通路，与轴承外圈11发生热交换，即对轴承外圈11的表面进行空冷，达到降低轴承外圈11温度的效果。交换后的热空气气流8由驱动风扇装置61抽送至远离轴承外圈11的空腔内，从第三开口73或第二开口72处排出外界。When the fan device 61 is driven to work, the outside air can be extracted, and the airflow 8 can quickly pass through the air guide path to exchange heat with the bearing outer ring 11, that is, the surface of the bearing outer ring 11 is air-cooled to reduce the outer bearing Circle 11 temperature effect. The exchanged hot air flow 8 is drawn into the cavity away from the bearing outer ring 11 by the driving fan device 61, and is discharged to the outside through the third opening 73 or the second opening 72.
本发明主要涉及轴承外圈11的具体冷却方式，相对于轴承内圈12，还需设置相应的主动冷却系统，以保证轴承外圈11和轴承内圈12的冷却的相互配合，达到整个轴承系统的热变形程度接近一致，进而保证轴承系统能够运作良好。The present invention mainly relates to the specific cooling method of the bearing outer ring 11. Compared with the bearing inner ring 12, a corresponding active cooling system needs to be provided to ensure the mutual cooperation of the cooling of the bearing outer ring 11 and the bearing inner ring 12 to achieve the entire bearing system The degree of thermal deformation is close to the same, thus ensuring that the bearing system can work well.
如图2所示，本实施例的结构与实施例1基本相同，其不同之处在于：将导流结构62替换为冷却风扇装置63，即将多个冷却风扇装置63沿轮毂3表面靠近轴承外圈11处周向均匀排布并固定，对轴承外圈11进行局部冷却。在其他实施例中，也可将多个冷却风扇装置63沿导流罩4的内表面靠近轴承外圈11处周向均匀排布并固定。冷却风扇装置63的出风方向朝向轴承外圈11，并且冷却风扇装置63距离轴承外圈11的距离不大于30厘米。冷却风扇装置63可选用尺寸和功率小于驱动风扇装置61的规格。这些固定于轴承外圈11附近的冷却风扇装置63能够使得轴承外圈11周围的空气气流8的流速大于空腔内其他区域的流速，从而强化轴承外圈11附近的局部对流换热，进而对轴承外圈11、轮毂3和转子2进行冷却。As shown in Figure 2, the structure of this embodiment is basically the same as that of Embodiment 1, and the difference is that: the guide structure 62 is replaced with a cooling fan device 63, that is, a plurality of cooling fan devices 63 are close to the outside of the bearing along the surface of the hub 3. The ring 11 is evenly arranged and fixed in the circumferential direction to locally cool the outer ring 11 of the bearing. In other embodiments, a plurality of cooling fan devices 63 may also be evenly arranged and fixed in the circumferential direction along the inner surface of the flow deflector 4 near the outer ring 11 of the bearing. The air outlet direction of the cooling fan device 63 faces the bearing outer ring 11, and the distance between the cooling fan device 63 and the bearing outer ring 11 is not more than 30 cm. The size and power of the cooling fan device 63 may be smaller than those of the driving fan device 61. These cooling fan devices 63 fixed near the bearing outer ring 11 can make the air flow 8 around the bearing outer ring 11 have a flow rate greater than that of other areas in the cavity, thereby enhancing the local convective heat transfer near the bearing outer ring 11, thereby improving The bearing outer ring 11, the hub 3 and the rotor 2 are cooled.
本实施例的图2中所示的冷却气流8的方向只是两种可能的流动方向，具体的气流流动方向依赖于该风力发电机组的开口几何、空腔内的具体布置等，同时也受外界气流等因素的影响。The direction of the cooling air flow 8 shown in Fig. 2 of this embodiment is only two possible flow directions. The specific air flow direction depends on the opening geometry of the wind turbine, the specific arrangement in the cavity, etc., and is also affected by the outside world. The influence of factors such as airflow.
虽然以上描述了本发明的具体实施方式，但是本领域的技术人员应当理解，这些仅是举例说明，在不背离本发明的原理和实质的前提下，可以对这些实施方式做出多种变更或修改。因此，本发明的保护范围由所附权利要求书限定。Although the specific embodiments of the present invention are described above, those skilled in the art should understand that these are merely examples, and various changes or modifications can be made to these embodiments without departing from the principle and essence of the present invention. modify. Therefore, the protection scope of the present invention is defined by the appended claims.