Blade, hub assembly and wind turbine generator

Abstract

The utility model discloses an embodiment provides a kind of air outlet cap, hub assembly and wind turbine generator, air outlet cap is conducive to reducing the wind resistance when gas is discharged on the basis of guaranteeing rainproof demand.Air outlet cap includes connection base body, including air guide section and the connection portion being set on air guide section, air guide section has air guide passage, and the connection portion is used to be connected with external component;Shell, rotationally connected with connection base body, shell has air inlet and air outlet, air inlet is communicated with air guide passage and is set;Supporting shaft, one end of supporting shaft is fixedly connected with one of connection base body and shell and the other end is rotationally cooperated with the other one;Wherein, the axis of air outlet and the axis of supporting shaft are intersected and set, the gravity center of shell is deviated from the axis of supporting shaft and is set to the side where air outlet is.

Description

Technical Field

[0001] This utility model relates to the field of wind power technology, and in particular to a wind turbine hood, a hub assembly, and a wind turbine generator set. Background Technology

[0002] In the design of large-scale wind turbine hubs, the heat dissipation requirements of internal electrical and mechanical components need to be met. Currently, the mainstream solutions are either external fiberglass shrouds or no shrouds at all.

[0003] The fairing-less design utilizes air inlets and outlets at the wheel hub, with an exhaust cap ensuring airflow for heat dissipation. The exhaust effect of the exhaust cap directly impacts the heat dissipation capacity. Especially in active cooling scenarios, airflow requirements increase dramatically, while simultaneously preventing rainwater from entering and damaging the pitch bearings and electrical insulation, and preventing long-term dust accumulation from affecting insulation and causing electrical failure.

[0004] However, the air vent caps in related technologies have high air resistance when discharging air, making it difficult to meet the heat dissipation requirements of the internal components of the wheel hub. Utility Model Content

[0005] This utility model provides an exhaust cap, a hub assembly, and a wind turbine generator set. The exhaust cap helps reduce wind resistance when the gas is discharged, while ensuring rain protection.

[0006] On one hand, according to an embodiment of the present invention, an air outlet cap is provided, comprising: a connecting base, including an air guide section and a connecting part disposed on the air guide section, the air guide section having an air guide channel; a cover, rotatably connected to the connecting base, the cover having an air inlet and an air outlet, the air inlet being connected to the air guide channel; a support shaft, one end of the support shaft being fixedly connected to one of the connecting base and the cover, and the other end being rotatably engaged with the other of the connecting base and the cover; wherein, the axis of the air outlet intersects the axis of the support shaft, and the center of gravity of the cover is offset from the axis of the support shaft towards the side where the air outlet is located.

[0007] According to one aspect of the present invention, one of the connecting base and the cover is provided with an annular protrusion and the other is provided with an annular groove, the annular protrusion extending into the annular groove and rotating relative to each other about the axis of the support shaft as the rotation center.

[0008] According to one aspect of the present invention, an annular protrusion is provided on the outer periphery of the connecting base, and an annular groove is formed at one end of the air inlet of the cover. The cover is fitted onto the outer periphery of the connecting base, and the support shaft and the annular protrusion are coaxially arranged.

[0009] According to one aspect of the present utility model, the cover is provided with a mounting hole corresponding to the support shaft, and a rotating connector is provided at the mounting hole. One end of the support shaft is fixedly connected to the connecting base, and the other end is rotatably engaged with the cover through the rotating connector.

[0010] According to one aspect of the present invention, the air outlet cap further includes connecting fins, and a plurality of connecting fins are arranged at intervals around the support shaft, and the support shaft is fixedly connected to the air guide section through each connecting fin.

[0011] According to one aspect of the present invention, the housing includes a guide extending from the air inlet to the air outlet, the orthographic projection of the guide on the axial direction of the support shaft covering the air inlet.

[0012] According to one aspect of the present invention, the guide includes an arc-shaped guide section and a vertical guide section, the arc-shaped guide section being connected between the connecting base and the vertical guide section, the air outlet being located at one end of the vertical guide section away from the arc-shaped guide section, and the support shaft being rotatably connected to at least one of the arc-shaped guide section and the vertical guide section.

[0013] According to one aspect of the present invention, the axis of the air outlet is arranged perpendicular to the extension direction of the axis of the support shaft.

[0014] According to one aspect of the present invention, the connecting part includes an annular flange, which is disposed around the air guide section.

[0015] According to one aspect of the present invention, the connecting base is a rotating body as a whole, and the connecting base and the support shaft are coaxially arranged.

[0016] According to one aspect of the present invention, a protective net is provided at the air outlet, and the protective net is connected to the cover.

[0017] In another aspect, according to an embodiment of the present invention, a wheel hub assembly is provided, including: a wheel hub body having an inner cavity and an air inlet connection hole and a guide shroud mounting hole communicating with the inner cavity; the aforementioned air outlet cap being disposed in the guide shroud mounting hole, and the air guide channel communicating with the inner cavity.

[0018] In another aspect, according to an embodiment of the present invention, a wind turbine generator set is provided, comprising: a nacelle; the aforementioned hub assembly disposed in the nacelle; and an air inlet cap disposed in the air inlet connection hole.

[0019] The wind turbine hood, hub assembly, and wind turbine generator set provided in the embodiments of this utility model The connecting base is fixed to the hub via a connecting part and can rotate synchronously with the hub body. The cover and the connecting base are rotated together by a support shaft, and the center of gravity of the cover is offset from the axis of the support shaft towards the air outlet. Under the continuous action of gravity, because the axis of the air outlet intersects the axis of the support shaft and the center of gravity is biased towards the air outlet, the air outlet direction is always fixed downward. No matter how the connecting base rotates with the hub, under the action of gravity, the cover will adaptively adjust its posture around the support shaft or the whole formed by the support shaft and the cover will adaptively adjust its posture relative to the connecting base around the axis of the support shaft, always keeping the air outlet facing downward. When rainwater falls vertically under the force of gravity, it cannot enter the interior of the cover from the downward-facing air outlet, nor will it invade the hub through the air guide channel. This effectively avoids the risk of rainwater damaging the pitch bearing and destroying electrical insulation, and completely solves the problem of insufficient rain protection of existing rain caps.

[0020] Furthermore, the air outlet method provided in one embodiment of this application differs from the 360° air outlet in related technologies, instead opting for downward air outlet. Unlike the 360° air outlet solution, it does not require a sealing structure around the entire circumference to prevent rainwater, significantly reducing airflow resistance in the air outlet path. At the same time, because the air outlet direction is fixed, there is no multi-directional airflow interference when the air is discharged, allowing it to be smoothly discharged through the air outlet 20b, fully meeting the high airflow requirements in active cooling scenarios. Ultimately, while ensuring reliable rain protection, it maximizes air outlet efficiency and adapts to the heat dissipation requirements of large-scale wind turbine hubs. Attached Figure Description

[0021] The features, advantages and technical effects of exemplary embodiments of the present invention will now be described with reference to the accompanying drawings.

[0022] Figure 1 This is an isometric view of the air outlet cap according to one embodiment of the present invention; Figure 2 This is a side view of the air vent cap according to an embodiment of the present invention; Figure 3 This is a partially cut-away structural diagram of the air outlet cap according to one embodiment of the present invention; Figure 4 yes Figure 2 A magnified view of a section at point A in the middle; Figure 5 This is a schematic diagram of the structure of a wheel hub assembly according to an embodiment of the present invention.

[0023] Marker explanation: 100. Vent cap; 10. Connecting base; 11. Air guide section; 111. Air guide channel; 12. Connecting part; 13. Annular protrusion; 20. Casing; 20a. Air inlet; 20b. Air outlet; 20c. Annular groove; 20d. Mounting hole; 21. Guide component; 211. Arc-shaped guide section; 212. Vertical guide section; 30. Support shaft; 40. Connecting fins; 50. Rotating connector; 60. Protective netting; 70. Bearing end cap; 80. Dust cover; 90. Tighten the nut; 200. Wheel hub body; 201. Air inlet connection hole; 202. Deflector mounting hole; 300. Vent cap; X, axial direction.

[0024] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale. Detailed Implementation

[0025] The features and exemplary embodiments of various aspects of this utility model will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a comprehensive understanding of this utility model. However, it will be apparent to those skilled in the art that this utility model can be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of this utility model by illustrating examples of it. In the accompanying drawings and the following description, at least some well-known structures and techniques have not been shown to avoid unnecessarily obscuring the utility model; 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.

[0026] 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 hood, hub assembly, or wind turbine generator set of this utility model. It should also be noted in the description of this utility model 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 utility model according to the specific circumstances.

[0027] As onshore wind turbines become larger, the number and power of the electrical and mechanical components integrated inside the hub increase, resulting in a significant increase in the heat generated during operation. If the heat cannot be dissipated in time, it will affect the normal working life of the components and the reliability of the unit. Therefore, hub heat dissipation has become a key consideration in the design of larger turbines.

[0028] To address the issue of wheel hub heat dissipation, the industry has developed two common external design solutions: one is a fiberglass fairing, and the other is a fairing-less design. The fairing-less design, because it eliminates the need for an additional fairing structure, is widely used in some scenarios. It achieves heat dissipation by arranging several air inlets and outlets on the wheel hub and guiding airflow through vents, thus facilitating air exchange between the wheel hub and the outside environment. However, the heat dissipation capacity of this solution entirely depends on the effectiveness of the vents' air intake and exhaust.

[0029] The airflow requirements of the wind hood vary significantly depending on the cooling method. Passive cooling hub exhaust hoods have relatively low airflow requirements, generally achieving a balance between heat dissipation and environmental protection. However, with active cooling, the airflow requirements of the exhaust hood increase dramatically to achieve efficient heat dissipation. In high-airflow scenarios, it is necessary to ensure that the exhaust hood has sufficient outlet area to reduce wind resistance and meet airflow demands. Furthermore, the waterproof and dustproof performance of the exhaust hood must be enhanced. Otherwise, rainwater entering the hub will directly and fatally damage the operating accuracy of the pitch bearing and the insulation performance of electrical components. Long-term accumulation and hardening of sand and dust will increase creepage clearances in electrical components, reduce insulation levels, and ultimately lead to electrical component failure, seriously threatening the safe operation of the unit.

[0030] While air vent caps have been incorporated into existing technologies to address rain protection needs, the design of these caps has several flaws. Specifically, the air vents in a 360° direction require efficient rain protection, which results in significant air resistance, affecting airflow and consequently cooling performance.

[0031] Based on this, one embodiment of this application provides a new type of vent cap that reduces wind resistance during gas exhaust while ensuring rain protection.

[0032] like Figures 1 to 5 As shown, an embodiment of this application provides an air outlet cap 100, including a connecting base 10, a cover 20, and a support shaft 30. The connecting base 10 includes an air guide section 11 and a connecting portion 12 disposed on the air guide section 11. The air guide section 11 has an air guide channel 111, and the connecting portion 12 can be used to connect with external components. The cover 20 is rotatably connected to the connecting base 10 and has an air inlet 20a and an air outlet 20b. The air inlet 20a is connected to the air guide channel 111. One end of the support shaft 30 is fixedly connected to one of the connecting base 10 and the cover 20, and the other end is rotatably engaged with the other of the connecting base 10 and the cover 20. The axis of the air outlet 20b intersects the axis of the support shaft 30, and the center of gravity of the cover 20 is offset from the axis of the support shaft 30 towards the side where the air outlet 20b is located.

[0033] The air guide section 11 and the connecting part 12 of the connecting base 10 can be an integral structure, or they can be formed separately and then connected and fixed by welding and fasteners.

[0034] The air guide section 11 can be designed as a cylindrical or stepped section. When a stepped section is used, the large end can be connected to the hub air outlet and the small end can be connected to the cover 20 to achieve airflow convergence.

[0035] The connecting part 12 can be flanged, for example, locked to the hub flange by bolts, suitable for large machines. Alternatively, the connecting part 12 can be snap-fit, for example, a spring-loaded snap-fit ​​that engages with the hub interface, suitable for routine maintenance. In some embodiments, a threaded connection can be provided, allowing the external thread of the air guide section 11 to mate with the internal thread of the hub, both options meeting connection requirements.

[0036] The air duct 111 can refer to the hollow cavity that runs through the base 10. One end of the cavity is connected to the inside of the hub, and the other end is connected to the air inlet 20a of the cover 20, so as to ensure that the heat dissipation airflow can smoothly enter the cover 20 from the hub.

[0037] The external structure can be selected as the hub body, but it can also be adapted to other locations on the wind turbine generator set that require ventilation, such as nacelle cooling. To better understand the exhaust cap 100 provided in one embodiment of this application, the following examples will use the hub body as the external structure.

[0038] The housing 20 is rotatable relative to the connecting base 10 and has a housing structure with airflow inlet and outlet channels, namely including an air inlet 20a and an air outlet 20b. The air inlet 20a is connected to the air guide channel 111 to introduce airflow. The air outlet 20b is used to discharge airflow.

[0039] The cover 20 can be in the form of a zigzag cover 20 or a streamlined cover 20.

[0040] The rotatable connection can be understood as the connection base 10 and the support shaft 30 rotating relative to the cover 20 while the hub rotates, and the position of the cover 20 can remain unchanged.

[0041] The intersection of the axis of the air outlet 20b and the axis of the support shaft 30 can be understood as the extension direction of the axis of the air outlet 20b being neither coincident nor parallel to the axis of the support shaft 30. The two are intersecting, and the angle of intersection can be selected from 30° to 150°, with 90° being a possible value.

[0042] The axial direction of the air outlet 20b can be understood as the direction in which the air outlet 20b opens. The air outlet 20b can be a circular hole, a polygonal hole, or other irregular hole structure. When it is a polygonal or irregular hole structure, its axial direction can be understood as the direction perpendicular to the plane containing the opening end face of the air outlet.

[0043] The setting of the center of gravity of the cover 20 offset from the axis of the support shaft 30 towards the side where the air outlet 20b is located can be understood as follows: the cover 20 is divided into upper and lower parts with the axis of the support shaft 30 as the center. The center of gravity of the cover 20 is located in the lower part and is offset towards the side of the air outlet 20b. This means that when one end of the support shaft 30 is fixedly connected to the connecting base 10 and the other end is rotatably connected to the cover 20, the cover 20 will not rotate with the connecting base 10 and the support shaft 30 under the action of gravity and the rotational connection between the cover 20 and the support shaft 30 and the connecting base 10 as the hub rotates. The position of the air outlet 20b can be fixed to the lower side offset from the axis of the support shaft 30. When one end of the support shaft 30 is rotatably engaged with the connecting base 10 and the other end is fixedly connected to the cover 20, the cover 20 and the support shaft 30 will not rotate with the connecting base 10 under the action of gravity when the connecting base 10 rotates with the hub. The position of the air outlet 20b can also be fixed to the lower side that is deviated from the axis of the support shaft 30.

[0044] One end of the support shaft 30 is fixedly connected to one of the connecting base 10 and the cover 20, while the other end is rotatably engaged with the other. To better understand this application, the following example illustrates the situation where one end of the support shaft 30 is fixedly connected to the connecting base 10 and the other end is rotatably engaged with the cover 20.

[0045] One embodiment of this application provides an air outlet cap 100, in which a connecting base 10 is fixed to a wheel hub via a connecting part 12 and can rotate synchronously with the wheel hub body. A cover 20 and the connecting base 10 are rotated together via a support shaft 30. The center of gravity of the cover 20 is offset from the axis of the support shaft 30 towards the air outlet 20b. Under continuous gravity, because the axis of the air outlet 20b intersects the axis of the support shaft 30 and the center of gravity is biased towards the air outlet side, the air outlet direction is ensured to be fixed downwards, regardless of how the connecting base 10 rotates with the wheel hub. The cover 20 will adaptively adjust its posture around the support shaft 30, or the support shaft 30 and the cover 20 will be connected to the base 10 around the axis of the support shaft to adaptively adjust their posture, always keeping the air outlet 20b facing downwards. When rainwater falls vertically under gravity, it cannot enter the interior of the cover 20 from the downward-facing air outlet 20b, nor will it invade the hub through the air guide channel 111. This effectively avoids the risk of rainwater damaging the pitch bearing and destroying the electrical insulation, and completely solves the problem of insufficient rain protection effect of existing rain caps.

[0046] Furthermore, the air outlet method provided in one embodiment of this application differs from the 360° air outlet in related technologies, instead opting for downward air outlet. Unlike the 360° air outlet solution, it does not require a sealing structure around the entire circumference to prevent rainwater, significantly reducing airflow resistance in the air outlet path. At the same time, because the air outlet direction is fixed, there is no multi-directional airflow interference when the air is discharged, allowing it to be smoothly discharged through the air outlet 20b. This fully meets the high airflow requirements in active cooling scenarios, ultimately maximizing air outlet efficiency while ensuring reliable rain protection, and adapting to the heat dissipation requirements of large-scale wind turbine hubs.

[0047] In some alternative embodiments, one of the connecting base 10 and the cover 20 is provided with an annular protrusion 13 and the other is provided with an annular groove 20c. The annular protrusion 13 extends into the annular groove 20c and rotates relative to each other about the axis of the support shaft 30.

[0048] That is, one of the connecting base 10 and the cover 20 is provided with an annular protrusion 13 and the other is provided with an annular groove 20c. The annular protrusion 13 extends into the annular groove 20c and the two rotate relative to each other around the axis of the support shaft 30. The rotational guidance and radial limit are ensured by the annular fit and coaxial rotation.

[0049] The annular protrusion 13 can be provided at the end or outer periphery of the connecting base 10, and the annular groove 20c is correspondingly provided on the inner side or end of the cover 20. The cross-section of the annular protrusion 13 and the annular groove 20c can be rectangular, trapezoidal or arc-shaped. The outer side of the protrusion can be provided with a wear-resistant coating, such as a polytetrafluoroethylene coating, to adapt to long-term rotation scenarios.

[0050] One embodiment of this application provides an air outlet cap 100 that, through the engagement of an annular protrusion 13 and an annular groove 20c, provides radial restraint for the relative rotation of the connecting base 10 and the cover 20, preventing radial offset or wobbling during rotation. It also restrains the two in the axial direction X, preventing them from separating in that direction. Simultaneously, the annular contact increases the guiding area, improving rotational stability and ensuring that the air inlet 20a and the air guide channel 111 are always aligned, maintaining smooth airflow.

[0051] In some optional embodiments, an annular protrusion 13 is provided on the outer periphery of the connecting base 10, and the cover 20 is bent at one end of the air inlet 20a to form an annular groove 20c. The cover 20 is sleeved on the outer periphery of the connecting base 10, and the support shaft 30 and the annular protrusion 13 are coaxially arranged.

[0052] The annular protrusion 13 and the connecting base 10 can be an integral structure, or it can be welded to the connecting base 10. The annular protrusion 13 can be in the shape of a ring, or optionally in the shape of an annular plate.

[0053] The cover 20 can be bent multiple times, such as three times, at one end of the air inlet 20a to form an annular groove 20c. The cross-sectional shape of the annular groove 20c in the circumferential direction can match the cross-sectional shape of the annular protrusion 13 in the circumferential direction and fit with each other with a gap.

[0054] The air outlet cap 100 provided in one embodiment of this application simplifies the assembly process by having a cover 20 fitted around the outer periphery of the connecting base 10. Initial positioning can be completed simply by axial fitting. The annular groove 20c formed by bending mates with the annular protrusion 13 on the outer periphery of the connecting base 10. Combined with the coaxial arrangement of the support shaft 30 and the annular protrusion 13, the rotation center is further aligned, reducing eccentric wear. At the same time, the outer sleeve structure can cover the gap between the air inlet 20a and the air guide channel 111, helping to prevent rainwater from seeping in.

[0055] In some alternative embodiments, the cover 20 is provided with a mounting hole 20d corresponding to the support shaft 30, and a rotating connector 50 is provided at the mounting hole 20d. One end of the support shaft 30 is fixedly connected to the connecting base 10, and the other end is rotatably engaged with the cover 20 through the rotating connector 50.

[0056] The housing 20 has a mounting hole 20d, which can house the rotating connector 50, or the rotating connector can be positioned opposite the mounting hole 20d but not extending into it. One end of the support shaft 30 is fixed to the connecting base 10. Specifically, the support shaft 30 can be indirectly connected to the connecting base 10 through a connecting rod, connecting rib, or other structure to ensure that it is fixed to the connecting base 10. The other end passes through the rotating connector 50.

[0057] Rotary connecting member 50 includes at least one of the following structures: bearing, oil-impregnated bushing, etc.

[0058] One embodiment of this application provides an air outlet cap 100, in which the rotating connector 50 reduces the direct friction between the support shaft 30 and the cover 20, reduces rotational resistance, and allows the cover 20 to maintain its posture more smoothly under gravity, ensuring that the air outlet 20b always faces downwards. At the same time, the rotating connector 50 can absorb assembly errors, avoid jamming caused by coaxiality deviation between the support shaft 30 and the mounting hole 20d, and extend the service life of the overall structure.

[0059] In some alternative embodiments, the rotating connector 50 may include a bearing disposed within the mounting hole 20d, with the inner ring of the bearing engaging with the support shaft 30 and the outer ring of the bearing engaging with the housing 20.

[0060] Optionally, the vent cap 100 may also include a bearing end cover 70, which may be disposed around the support shaft 30 and connected to the housing 20. The bearing end cover 70 at least partially abuts against the end face of the bearing in the axial direction X of the support shaft 30 to limit the bearing from displacing in the axial direction X toward the side where the connection portion 12 is located.

[0061] Optionally, the bearing end cover 70 and the housing can be enclosed to form a mounting cavity that matches the shape of the bearing for mounting the bearing. The inner ring of the bearing mates with the support shaft, and the outer ring of the bearing mates with the housing.

[0062] Optionally, the vent cap 100 may also include a dust cover 80, which is disposed outside the housing 20 and connected to the housing 20. The dust cover 80 is disposed around the support shaft 30 and forms a dustproof space around the housing 20. The dust cover 80 covers one axial X end of the support shaft 30.

[0063] Optionally, the air outlet cap 100 also includes a retaining ring and a locking nut 90, which are disposed in the dustproof space and sleeved on the support shaft 30. The locking nut 90 is threadedly connected to the support shaft 30 and forms a gap between it and the cover 20.

[0064] During operation, the inner ring of the bearing, the support shaft 30, the retaining ring, and the locking nut 90 rotate together with the hub. The outer ring of the bearing, the housing 20, and the bearing end cover 70 remain stationary under the influence of gravity.

[0065] In some alternative embodiments, the air outlet cap 100 further includes connecting fins 40, a plurality of connecting fins 40 being spaced apart around the support shaft 30, and the support shaft 30 being fixedly connected to the air guide section 11 through each connecting fin 40.

[0066] The number of connecting fins 40 can be set to 3-6. The shape of the connecting fins 40 can be a straight plate or an arc plate. The connection between the connecting fins 40 and the support shaft 30 and the air guide section 11 includes, but is not limited to, detachable connections using fasteners such as welding or bolts.

[0067] One embodiment of this application provides an air outlet cap 100 in which multiple spaced connecting fins 40 ensure the connection strength between the support shaft 30 and the air guide section 11 while reducing the obstruction of the air outlet 20b of the air guide channel 111, thus avoiding an increase in local resistance when the airflow is discharged.

[0068] Optionally, multiple connecting fins 40 are spaced apart and evenly arranged around the support shaft 30 to ensure that the support shaft 30 is subjected to uniform force, prevent deformation caused by uneven load after long-term use, and improve structural stability.

[0069] In some alternative embodiments, the housing 20 includes a guide 21 extending from the air inlet 20a to the air outlet 20b, the orthographic projection of the guide 21 on the axial X of the support shaft 30 covering the air inlet 20a.

[0070] The guide 21 extends along the airflow path to receive the airflow entering from the air inlet 20a. The specific shape of the guide 21 is not limited, but the integrity of the airflow guidance is ensured only by extending and covering.

[0071] The cross-section of the guide 21 can be tapered or equal in diameter. The guide 21 can be tubular or composed of multiple sheet-like structures. The extension path can be straight or a smooth curve. The inner wall of the guide 21 can be coated with a smooth coating.

[0072] One embodiment of this application provides an exhaust cap 100 that, by extending the guide 21 from the air inlet 20a to the air outlet 20b, smoothly guides the airflow entering the housing 20 along a preset path to the air outlet 20b, preventing the airflow from forming turbulence or eddies within the housing 20 and reducing local wind resistance. Its design, which projects to cover the air inlet 20a, ensures that all airflow entering the housing 20 is guided, avoiding airflow dispersion that leads to decreased exhaust efficiency and further improving heat dissipation.

[0073] In some alternative embodiments, the guide 21 includes an arc-shaped guide section 211 and a vertical guide section 212. The arc-shaped guide section 211 is connected between the connecting base 10 and the vertical guide section 212. The air outlet 20b is located at one end of the vertical guide section 212 away from the arc-shaped guide section 211. The support shaft 30 is rotatably connected to at least one of the arc-shaped guide section 211 and the vertical guide section 212.

[0074] The radius of curvature of the arc-shaped guide section 211 can be adapted to the overall size of the cover 20, and the length of the vertical guide section 212 can be adjusted according to the air outlet requirements; the support shaft 30 can be rotatably connected only to the arc-shaped section, or only to the vertical guide section 212. Of course, it can be rotatably connected to both the arc-shaped section and the vertical guide section 212 at the same time, for example, rotatably connected to the joint between the two.

[0075] The arc-shaped guide segment 211 can extend along an arc-shaped trajectory. The central angle corresponding to the arc-shaped trajectory extended by the arc-shaped guide segment 211 can be selected from 60° to 110°, or 90°.

[0076] One embodiment of this application provides an air outlet cap 100 that, through an arc-shaped guide section 211, allows airflow to smoothly transition from a horizontal or slightly inclined outlet direction connected to the base 10 to a vertical direction via a vertical guide section 212, reducing energy loss during airflow transition. The vertical guide section 212 ensures that the air outlet 20b faces downwards, enhancing rain protection. The two-section structure balances the smoothness of airflow guidance with the stability of the outlet direction, further balancing airflow efficiency and rain protection performance.

[0077] In some alternative embodiments, the axis of the support shaft 30 is arranged perpendicular to the extension direction of the axis of the support shaft 30.

[0078] The air outlet 20b can be a single circular hole located below the cover 20, concentrating the airflow. Alternatively, the air outlet 20b can be multiple strip-shaped holes spaced apart along the bottom of the cover 20.

[0079] Optionally, after being connected to the hub, the axis of the support shaft 30 can extend horizontally or in the direction of the axis of the main shaft of the wind turbine. The extension direction of the air outlet 20b can be vertical, for example, in the direction of the height of the tower of the wind turbine where the hub is located.

[0080] One embodiment of this application provides an air outlet cap 100 where the axis of the air outlet 20b is perpendicular to the extension direction of the axis of the support shaft 30. This allows the air outlet 20b to face completely downwards, aligning with the vertical falling direction of rainwater, thus minimizing the possibility of rainwater entering and providing excellent rain protection. Simultaneously, vertical airflow allows the airflow to exit along the shortest path, reducing increased wind resistance caused by directional deviation and further improving airflow efficiency, making it particularly suitable for generator sets in rainy areas.

[0081] In some alternative embodiments, the connection 12 includes an annular flange that surrounds the air guide section 11.

[0082] The air outlet cap 100 provided in one embodiment of this application has an annular flange surrounding the air guide section 11, so that the connection force between the connecting base 10 and the hub is evenly distributed in the circumferential direction, avoiding deformation caused by excessive local stress; the flange connection is a standard detachable structure, which facilitates the installation, maintenance and replacement of the air outlet cap 100, and is compatible with the standard flange interface of most hubs, improving versatility.

[0083] Alternatively, the annular flange may be arranged around the air guide section 11 and coaxially with the air guide section 11.

[0084] Optionally, the annular flange is provided with multiple spaced flange holes, which can be detachably connected to equipment such as wheel hubs.

[0085] Optionally, a sealing groove may be provided on the flange surface, with a built-in sealing ring to enhance the sealing performance with the hub interface.

[0086] In some alternative embodiments, the connecting base 10 is a rotating body, and the connecting base 10 and the support shaft 30 are coaxially arranged.

[0087] The connecting substrate 10 can be cylindrical or conical. In some embodiments, the connecting substrate 10 can be stepped cylindrical or stepped conical.

[0088] The connecting base 10 and the support shaft 30 are coaxially arranged.

[0089] One embodiment of this application provides an air outlet cap 100, in which the connecting base 10 has a rotating structure, so that the connecting base 10 is subjected to uniform force when rotating with the hub, reducing vibration or increased wind resistance caused by structural asymmetry. The coaxial arrangement with the support shaft 30 ensures that the rotation center of the connecting base 10 and the cover 20 are consistent, avoiding wear or jamming caused by eccentric rotation, and improving the operational stability and service life of the overall structure.

[0090] In some alternative embodiments, a protective net 60 is provided at the air outlet 20b, and the protective net 60 is connected to the cover 20.

[0091] The protective net 60 can cover the air outlet 20b. The protective net 60 will not block the discharge of fluid inside the cover 20. The protective net 60 is used to block large foreign objects such as leaves and sand, and can also be used to block birds.

[0092] The protective net 60 and the cover 20 can be connected by welding or other fixing methods. Of course, in some embodiments, the protective net 60 and the cover 20 can also be connected by an opening or other means.

[0093] The air outlet cap 100 provided in one embodiment of this application can effectively block foreign objects (such as leaves, dust, insects, and birds) from entering the housing 20 and hub through the air outlet 20b by setting a protective net 60, thereby preventing foreign objects from blocking the air guide channel 111 or damaging the internal electrical or mechanical components. At the same time, the mesh design of the protective net 60 will not significantly increase the air outlet resistance, maintaining high air outlet efficiency while ensuring the protective function, which is especially suitable for unit scenarios with wind and sand or dense vegetation.

[0094] In another aspect, according to an embodiment of the present invention, a wheel hub assembly is provided, including: a wheel hub body 200 having an inner cavity and an air inlet connection hole 201 and a guide shroud mounting hole 202 communicating with the inner cavity; the aforementioned air outlet cap 100, the air outlet cap 100 being disposed in the guide shroud mounting hole 202 and connected to the wheel hub body 200, and the air guide channel 111 communicating with the inner cavity.

[0095] The hub body 200 is used to connect the wind turbine blades, which can be connected to the rotor of the generator of the wind turbine generator set.

[0096] The inner cavity refers to the enclosed or semi-enclosed space within the hub body 200 used to install components such as pitch bearings, electrical control cabinets, and drive motors.

[0097] Both the air inlet connection hole 201 and the air guide shroud mounting hole 202 are connected to the inner cavity, forming a complete airflow path where external air enters the inner cavity through the air inlet connection hole 201 and is then discharged through the air guide shroud mounting hole 202 and the air outlet cap 100.

[0098] One embodiment of this application provides a hub assembly that achieves efficient heat dissipation and component protection for a large-scale hub through the coordinated design of the hub body 200 and the aforementioned vent cap 100. The inner cavity of the hub body 200 provides installation space for electrical and mechanical components, and the complete airflow path ensures that external cooling air can enter the inner cavity and remove heat. The vent cap 100 is disposed in the guide vane mounting hole 202 and the air guide channel 111 communicates with the inner cavity, allowing the hot airflow in the inner cavity to enter the vent cap 100 through the air guide channel 111 and be discharged. Combining the core features of the vent cap 100, the cover 20 is rotatably connected to the connecting base 10, and the center of gravity is offset towards the air outlet 20b. This ensures that no matter how the hub body 200 rotates, the air outlet 20b of the vent cap 100 always faces downward, effectively preventing rainwater from entering the inner cavity through the guide vane mounting hole 202 and protecting the pitch bearing and electrical insulation. Meanwhile, the non-360° air outlet design of the vent cap 100 reduces air outlet resistance, ensuring that hot air can be discharged efficiently and meeting the high air volume requirements brought about by the increased number of components and heat dissipation needs of large wheel hubs.

[0099] In addition, the air inlet connection hole 201 of the wheel hub body 200 and the air outlet path of the air outlet cap 100 form a directional airflow circulation, which avoids heat accumulation in the inner cavity and further improves heat dissipation efficiency. Ultimately, the wheel hub assembly can adapt to large-scale design while having reliable rainproof performance and efficient heat dissipation capability, solving the problem that existing wheel hubs cannot balance heat dissipation and protection.

[0100] like Figure 5 As shown, in another aspect, according to an embodiment of the present invention, a wind turbine generator set is provided, including: a nacelle, a hub assembly, and an air inlet cap 300. The hub assembly is disposed in the nacelle, and the air inlet cap 300 is disposed in the air inlet connection hole 201.

[0101] The air intake cap 300 can be any air cap structure in related technologies that can block sand and rainwater from entering but allow air to enter.

[0102] The wind turbine generator set provided in one embodiment of this application, by including the hub assembly provided in the above embodiment, achieves efficient heat dissipation and stable operation of the large-scale unit. The nacelle provides installation support and overall protection for the hub assembly. As the core of energy conversion, the heat dissipation requirements of the hub assembly's internal cavity are met by the airflow circulation system of the air inlet cap 300 and the air outlet cap 100. The air inlet cap 300 is set at the air inlet connection hole 201 to introduce external cooling air into the inner cavity of the hub, carrying away the heat generated by the operation of the internal components. The hot airflow enters the air outlet cap 100 through the guide shroud mounting hole 202 of the hub assembly and is finally discharged from the air outlet cap 100, ensuring the power generation efficiency of the wind turbine generator set.

[0103] Although the present invention 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 the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An air outlet cap, characterized by, include: The connecting base (10) includes an air guide section (11) and a connecting part (12) disposed on the air guide section (11), wherein the air guide section (11) has an air guide channel (111). The cover (20) is rotatably connected to the connecting base (10). The cover (20) has an air inlet (20a) and an air outlet (20b). The air inlet (20a) is connected to the air guide channel (111). A support shaft (30), one end of which is fixedly connected to one of the connecting base (10) and the cover (20), and the other end of which is rotatably connected to the other of the connecting base (10) and the cover (20); The axis of the air outlet (20b) intersects the axis of the support shaft (30), and the center of gravity of the cover (20) is offset from the axis of the support shaft (30) towards the side where the air outlet (20b) is located.

2. The air outlet hood according to claim 1, characterized in that One of the connecting base (10) and the cover (20) is provided with an annular protrusion (13) and the other is provided with an annular groove (20c). The annular protrusion (13) extends into the annular groove (20c) and rotates relative to each other about the axis of the support shaft (30).

3. The air outlet hood according to claim 2, characterized in that The connecting base (10) is provided with the annular protrusion (13) on its outer periphery. The cover (20) is bent at one end of the air inlet (20a) and forms the annular groove (20c). The cover (20) is sleeved on the outer periphery of the connecting base (10). The support shaft (30) and the annular protrusion (13) are coaxially arranged.

4. The air outlet hood of claim 1, wherein The cover (20) is provided with a mounting hole (20d) corresponding to the support shaft (30), and a rotating connector (50) is provided at the mounting hole (20d). One end of the support shaft (30) is connected and fixed to the connecting base (10), and the other end is rotatably engaged with the cover (20) through the rotating connector (50).

5. The air outlet hood according to claim 1, wherein The air outlet cap (100) also includes connecting fins (40), and multiple connecting fins (40) are spaced apart around the support shaft (30). The support shaft (30) is fixedly connected to the air guide section (11) through each of the connecting fins (40).

6. The air outlet hood according to claim 1, wherein The housing (20) includes a guide (21) extending from the air inlet (20a) to the air outlet (20b), and the orthographic projection of the guide (21) on the axial (X) direction of the support shaft (30) covers the air inlet (20a).

7. The vent cap according to claim 6, characterized in that, The guide (21) includes an arc-shaped guide section (211) and a vertical guide section (212). The arc-shaped guide section (211) is connected between the connecting base (10) and the vertical guide section (212). The air outlet (20b) is located at one end of the vertical guide section (212) away from the arc-shaped guide section (211). The support shaft (30) is rotatably connected to at least one of the arc-shaped guide section (211) and the vertical guide section (212).

8. The air outlet hood of claim 1, wherein, The axis of the air outlet (20b) is perpendicular to the extension direction of the axis of the support shaft (30).

9. The air outlet hood according to claim 1, wherein, The connecting part (12) includes an annular flange, which is arranged around the air guide section (11); And / or, the connecting base (10) is a rotating body as a whole, and the connecting base (10) and the support shaft (30) are coaxially arranged.

10. The air outlet hood according to claim 1, characterized in that A protective net (60) is provided at the air outlet (20b), and the protective net (60) is connected to the cover (20).

11. A wheel hub assembly characterized by, include: The hub body (200) has an inner cavity and an air inlet connection hole (201) communicating with the inner cavity, as well as a fairing mounting hole (202). ； The air outlet cap (100) as described in any one of claims 1 to 10 is disposed in the air guide cover mounting hole (202), and the air guide channel (111) communicates with the inner cavity.

12. A wind power unit, characterized in that include: cabin; The wheel hub assembly as described in claim 11 is disposed in the engine compartment; An air inlet cap (300) is disposed at the air inlet connection hole (201).

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