Hub assembly, wind wheel and wind generating set

Abstract

The utility model provides a hub assembly, a wind wheel and a wind generating set, and the hub assembly comprises a hub which is provided with at least two bearing installation parts; the first variable pitch bearing is mounted on the bearing mounting part; the first end of the blade connection adapter is rotatably mounted on the bearing mounting part through a first variable pitch bearing; and the second variable-pitch bearing is installed at the second end of the blade connection adapter and used for being connected with the blade, and the axial direction of the second variable-pitch bearing inclines by a certain angle relative to the axial direction of the first variable-pitch bearing. The two variable-pitch bearings with different axial directions are arranged between the hub and the blade, the conventional variable-pitch effect can be achieved through one variable-pitch bearing, the whole blade is rotated to incline backwards or forwards under the extreme wind condition through the other variable-pitch bearing, the sweeping area is reduced, and therefore the load borne by a unit is reduced, and the service life of the unit is prolonged. The huge risks such as tower falling can be reduced, and the loss of power generation benefits of the unit under the extreme wind condition can be reduced.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of wind power generation, and more particularly, to a hub assembly, a wind wheel and a wind turbine generator. BACKGROUND

[0002] A wind turbine generator obtains wind energy through a blade wheel and converts it into electric energy. The formula for obtaining wind energy by a wind turbine generator is P = 1 / 2pAV 3 , where A is the swept area of the wind turbine generator, and V is the wind speed of the wind turbine generator. It can be seen that the larger the swept area of the wind turbine generator or the greater the wind speed, the more wind energy the wind turbine generator obtains, and correspondingly, the greater the load the wind turbine generator bears, and vice versa.

[0003] With the increase of installed capacity, the installation area of wind turbine generators is gradually shrinking, and wind turbines need to be installed in areas with good wind resources but extreme wind conditions such as strong winds or typhoons. The 50-year extreme wind speed (10-minute average wind speed) V50 of a land-based wind turbine generator can reach about 50 m / s, and the 50-year extreme wind speed (10-minute average wind speed) V50 of a sea-based wind turbine generator can reach about 60 m / s. When facing such a large wind speed, the wind turbine generator needs to bear a large load.

[0004] To ensure the reliability of the wind turbine generator under extreme wind conditions, key components of the wind turbine generator, such as blades and hubs, need to be designed according to the load under extreme wind conditions, and the components need to be made stronger, which increases the weight of the components, resulting in a substantial increase in the cost of the wind turbine generator.

[0005] However, the actual situation is that, on the one hand, the probability of extreme wind speed conditions is relatively small, and the structural reinforcement design made for this purpose exceeds the strength requirements of most working conditions, which is a waste; on the other hand, extreme wind conditions such as strong winds and typhoons are uncertain, and if the wind speed exceeds the limit design wind speed, the wind turbine generator still has the risk of tower collapse, which may cause huge losses. Therefore, there is an urgent need for a solution that can reduce the load of the wind turbine generator under extreme wind conditions such as strong winds and typhoons, improve the adaptability of the wind turbine generator, and at the same time, reasonably reduce the cost of the wind turbine generator. CONTENT OF THE INVENTION

[0006] Therefore, it is crucial to improve the adaptability of the wind turbine generator to extreme wind conditions while reasonably reducing the cost of the wind turbine generator.

[0007] In one general aspect, there is provided a hub assembly, including: a hub having at least two bearing mounting portions; a first variable pitch bearing mounted on the bearing mounting portion; a blade connection adapter, a first end of the blade connection adapter being rotatably mounted on the bearing mounting portion through the first variable pitch bearing; and a second variable pitch bearing mounted on a second end of the blade connection adapter for connection with a blade, an axial direction of the second variable pitch bearing being inclined at an angle relative to an axial direction of the first variable pitch bearing.

[0008] Optionally, the end face of the first end of the blade connecting adapter is inclined at an angle relative to the end face of the second end of the blade connecting adapter.

[0009] Optionally, the normal direction of the end face of the second end of the blade connecting adapter and the axial direction of the second pitch bearing are both matched with the span direction of the blade.

[0010] Optionally, the hub comprises a hub body and the at least two bearing mounting portions connected thereto.

[0011] Optionally, the normal direction of the end face of the hub body towards the bearing mounting portion is matched with the span direction of the blade.

[0012] Optionally, corresponding to the same blade, the number of the first pitch bearings is at least one, the blade connecting adapter comprises at least one adapter sub-section, the number of the adapter sub-sections is equal to the number of the first pitch bearings, and in the case that the number of the first pitch bearings is more than one, two adjacent adapter sub-sections are connected via one pitch bearing.

[0013] Optionally, in the case that the number of the first pitch bearings is more than one, each of the first pitch bearings is sequentially distributed along the extension direction of the blade connecting adapter and gradually inclined in the same direction according to the distribution order.

[0014] Optionally, the hub assembly further comprises a pitch driving system, the number of the pitch driving systems is equal to and one-to-one corresponding to the number of the pitch bearings in the hub assembly, and different pitch driving systems corresponding to the same blade are independently operated.

[0015] In another general aspect, there is provided a wind wheel, comprising: a hub assembly as described above; and a blade rotatably mounted on the blade connecting adapter via the second pitch bearing.

[0016] In another general aspect, there is provided a wind turbine, comprising: a wind wheel as described above; a nacelle connected at the leeward side of the wind wheel; and a tower supported at the bottom of the nacelle.

[0017] The present disclosure proposes a hub assembly, a wind wheel and a wind turbine generator set, by setting two variable pitch bearings with different axial directions between the hub and the blades, the two variable pitch bearings can work by switching, one of the variable pitch bearings can realize the conventional variable pitch function, which can ensure the set to generate more electricity in the normal state and bring more benefits, and the other variable pitch bearing can realize the adjustment of the blades in extreme wind conditions, which can make the blades rotate from the conventional position to the rear side of the nacelle of the wind turbine generator set or the front side of the wind wheel, and then reduce the radius of the swept circle and the swept area by the tilting of the blades, thereby reducing the load of the wind turbine generator set using the hub assembly, which can improve the safety and reliability of the blades and the nose of the set in extreme wind conditions, reduce the risk of tower collapse, and reduce the loss of power generation in extreme wind conditions, and improve the applicability of the set.

[0018] At the same time, this scheme only needs to make a simple change to the hub structure to reduce the load of the whole machine, compared with the solution of increasing the design strength of the set, which can reduce the design weight of the nose components, thereby reducing the manufacturing cost of the set, and can be quickly implemented and applied on the whole machine, and can reduce the dependence on the accuracy of the estimation of the limit design wind speed (the existing scheme needs to design the structural strength of the set according to the estimated limit design wind speed, so if the actual limit wind speed is too large, the tower may still collapse), even if facing uncertain extreme wind conditions, it can also more reliably reduce the risk of tower collapse.

[0019] In addition, the application scenarios of the embodiments of the present disclosure are wide, from the perspective of the hub assembly, it can be applied to the form with or without a fairing, from the perspective of the variable pitch system, it can be applied to electric variable pitch, gear variable pitch, hydraulic variable pitch or other variable pitch forms, from the perspective of the whole machine, it is not limited to the whole machine technical route, and can be applied to direct drive, semi-direct drive and high-speed doubly-fed sets, and has the feasibility of promotion in the industry.

[0020] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and other objects and features of the present disclosure will become more apparent from the following description of embodiments taken in conjunction with the accompanying drawings, in which:

[0022] Figure 1 is a longitudinal sectional view showing a hub assembly according to one embodiment of the present disclosure in one rotating state;

[0023] Figure 2 is a longitudinal sectional view showing a hub assembly according to one embodiment of the present disclosure in another rotating state;

[0024] Figure 3 is a longitudinal sectional view showing a hub assembly according to another embodiment of the present disclosure;

[0025] Figure 4 is a right view showing a wind turbine in one rotational state according to an embodiment of the present disclosure;

[0026] Figure 5 is a right view showing a wind turbine in another rotational state according to an embodiment of the present disclosure;

[0027] Figure 6 is a right view showing a wind turbine in yet another rotational state according to an embodiment of the present disclosure;

[0028] Figure 7 is a rear view showing a wind turbine in yet another rotational state according to an embodiment of the present disclosure.

[0029] Figures 1 to 7 BRIEF DESCRIPTION OF DRAWINGS

[0030] 10: hub assembly; 11: hub; 111: hub body; 112: bearing mounting portion; 12: first variable pitch bearing; 121: first bearing outer ring; 122: first bearing inner ring; 13: blade connection adapter; 14: second variable pitch bearing; 141: second bearing outer ring; 142: second bearing inner ring; 15: first variable pitch drive system; 16: second variable pitch drive system; 17: first web; 18: second web; 20: blade; 30: nacelle; 40: tower. DETAILED DESCRIPTION

[0031] The following detailed description is presented to aid the reader in gaining a comprehensive understanding of the methods, apparatuses, and / or systems described herein. However, various changes, modifications, and equivalents can be used, and the

[0032] The features described herein can be implemented in different forms and should not be construed as limited to the examples described herein. Rather, these examples are provided as example forms of implementing the methods, apparatuses, and / or systems described herein, which when considered in conjunction with the disclosure that follows, will convey the scope of the methods, apparatuses, and / or systems to those skilled in the art.

[0033] As used herein, the term "and / or" includes any one of the associated listed items, as well as any combination of any two or more of the associated listed items.

[0034] Although terms such as "first", "second", and "third" can be used herein to describe various components, assemblies, regions, layers or portions, these components, assemblies, regions, layers or portions should not be limited by these terms. Instead, these terms are only used to distinguish one component, assembly, region, layer or portion from another component, assembly, region, layer or portion. Thus, a first component, a first assembly, a first region, a first layer or a first portion referred to in the examples described herein can also be referred to as a second component, a second assembly, a second region, a second layer or a second portion without departing from the teachings of the examples.

[0035] In the description, when an element such as a layer, a region, or a substrate is described as "on" another element, "connected to" or "coupled to" another element, it can be directly on, directly connected to, or directly coupled to the other element, or one or more other elements can be interposed therebetween. In contrast, when an element is described as "directly on" another element, "directly connected to" or "directly coupled to" another element, no other element is interposed therebetween.

[0036] The terms used herein are only used to describe various examples and not to limit the disclosure. The singular form also intends to include the plural form unless the context clearly indicates otherwise. The terms "comprise", "include" and "have" indicate the presence of the stated feature, number, operation, component, element, and / or combination thereof, but do not exclude the presence or addition of one or more other features, numbers, operations, components, elements, and / or combinations thereof.

[0037] Unless otherwise defined, all terms used herein, including technical terms and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the disclosure belongs after the disclosure is understood. Unless explicitly defined herein, terms such as those defined in a general dictionary should be interpreted as having meanings consistent with their meanings in the context of the relevant art and the disclosure, and should not be interpreted ideally or overly formally.

[0038] In addition, in the description of the examples, when it is considered that a detailed description of the related structure or function known to be confusing to the disclosure will be caused, such a detailed description will be omitted.

[0039] The following will be described in conjunction with Figures 1 to 7 The hub assembly 10, the wind wheel, and the wind turbine provided by the embodiments of the disclosure are introduced.

[0040] As Figures 1 to 3As shown, one embodiment of this disclosure provides a hub assembly 10, which includes a hub 11, a first pitch bearing 12, a blade connection adapter 13, and a second pitch bearing 14. The hub 11 has at least two bearing mounting portions 112; the first pitch bearing 12 is mounted on the bearing mounting portion 112; the first end of the blade connection adapter 13 is rotatably mounted on the bearing mounting portion 112 via the first pitch bearing 12; the second pitch bearing 14 is mounted on the second end of the blade connection adapter 13 for connection with a blade 20, and the axial direction of the second pitch bearing 14 is tilted at a certain angle relative to the axial direction of the first pitch bearing 12.

[0041] According to the embodiments of the present disclosure, the hub assembly 10, by providing two pitch bearings with different axial directions between the hub 11 and the blade 20, allows for switching between the two pitch bearings. One pitch bearing enables conventional pitch control, ensuring the unit generates more electricity and generates more revenue under normal conditions. The other pitch bearing allows for adjustment of the blade 20 under extreme wind conditions, enabling free movement of the blade 20. Figure 4 The unit is rotated from its normal position to tilt towards the rear of the nacelle 30 of the wind turbine or towards the front of the rotor. Figure 5 An example is shown where the upper blade 20 is tilted backward and the two lower blades 20 are tilted forward. Figure 6 An example is shown where all blades 20 are tilted backwards. By tilting the blades 20, the radius of the sweep circle is reduced, and the sweep area is reduced accordingly. This reduces the load on the wind turbine generator set using the hub assembly 10. It can improve the safety and reliability of the turbine blades 20 and the main components of the turbine head under extreme wind conditions, reduce the huge risks such as tower collapse, and reduce the loss of power generation revenue under extreme wind conditions, thus improving the applicability of the turbine.

[0042] Meanwhile, this solution only requires simple modifications to the hub structure to reduce the load on the entire unit. Compared to solutions that increase the design strength of the unit, it can reduce the design weight of the nose component, thereby further reducing the manufacturing cost of the unit. It can also be quickly implemented and applied to the entire unit. Furthermore, it can reduce the reliance on the accuracy of the prediction of the extreme design wind speed (existing solutions require designing the structural strength of the unit based on the predicted extreme design wind speed, so if the actual extreme wind speed is too high, the tower may still collapse). Even in the face of uncertain extreme wind conditions, it can reliably reduce the risk of tower collapse.

[0043] In addition, the application scenarios of the embodiments of the present disclosure are wide, from the perspective of the hub assembly, it can be applied to the form with or without a fairing, from the perspective of the variable pitch system, it can be applied to the electric variable pitch, gear variable pitch, hydraulic variable pitch or other variable pitch forms, from the perspective of the whole machine, it is not limited to the technical route of the whole machine, and can be applied to the direct drive, semi-direct drive, high-speed doubly-fed unit, and has the feasibility of promotion in the industry.

[0044] Regarding the connection mode of the variable pitch bearing, as an example, taking the first variable pitch bearing 12 and the second variable pitch bearing 14 both adopting a rolling bearing (that is, including a matched inner ring and outer ring) as an example, the inner ring and the outer ring of one variable pitch bearing can be connected on different structures respectively, so as to realize the relative rotation between the two structures connected by the inner ring and the outer ring respectively. Specifically, for the first variable pitch bearing 12, one of the inner ring and the outer ring thereof can be mounted on the bearing mounting portion 112, and the other of the inner ring and the outer ring thereof can be mounted on the first end of the blade connection adapter 13, so as to realize that the first end of the blade connection adapter 13 is rotatably mounted on the bearing mounting portion 112 through the first variable pitch bearing 12, for example, including but not limited to as shown in FIG. 1, the outer ring (that is, the first bearing outer ring 121) thereof is mounted on the bearing mounting portion 112, and the inner ring (that is, the first bearing inner ring 122) thereof is mounted on the first end of the blade connection adapter 13. Figure 1 For the second variable pitch bearing 14, one of the inner ring and the outer ring thereof can be mounted on the second end of the blade connection adapter 13, and the other of the inner ring and the outer ring thereof can be used to connect with the blade 20, so as to realize that the second end of the blade connection adapter 13 is connected with the blade 20 through the second variable pitch bearing 14, for example, including but not limited to as shown in FIG. 1, the outer ring (that is, the second bearing outer ring 141) thereof is mounted on the second end of the blade connection adapter 13, and the inner ring (that is, the second bearing inner ring 142) thereof is used to connect with the blade 20. Figure 1 In addition to the rolling bearing, the first variable pitch bearing 12 and the second variable pitch bearing 14 can also adopt other forms of bearings, for example, including but not limited to cross-roller bearings, spherical-cylindrical combined rotary disc bearings, and these forms of variable pitch bearings can be connected with the bearing mounting portion 112 of the hub 11, the first end and the second end of the blade connection adapter 13 and the blade in a reasonable manner, which are all the implementation manners of the present disclosure, and will not be listed one by one here.

[0045] It should be understood that whether the blade 20 will tilt towards the front side or the rear side of the unit after overall rotation is determined by the inclination direction of the variable pitch bearing, and here refers to the inclination direction of the variable pitch bearing in the initial installation state (that is, the state that the blade 20 is in the normal position as shown in FIG. 1). Figure 4 Figure 1 ​As shown, the axial direction of the second pitch bearing 14 matches the spanwise direction of the blade 20, enabling conventional pitch control. The axial direction of the first pitch bearing 12 is inclined towards the inside of the hub 11 relative to the axial direction of the second pitch bearing 14, so that after the first pitch bearing 12 rotates 180°, the blade 20 will be in a position as shown in the diagram. Figure 2 The forward tilting state shown is reversed. Conversely, if the axial direction of the first pitch bearing 12 is tilted towards the outside of the hub 11 relative to the axial direction of the second pitch bearing 14, then after the first pitch bearing 12 rotates 180°, the blade 20 will be in a position relative to... Figure 2 The opposite is the backward tilting state. Therefore, the additional pitch bearing (e.g., according to the tilting direction requirement of blade 20) can be reasonably set. Figures 1 to 3 The tilting direction of the first pitch bearing 12) in the pitch bearing can be adjusted, and the tilting degree of the blade 20 after rotation can be adjusted by adjusting the tilting angle of the pitch bearing. This disclosure does not limit the specific tilting direction and tilting angle of the pitch bearing.

[0046] The wheel hub assembly 10 according to an embodiment of the present disclosure will now be further described.

[0047] like Figures 1 to 3 As shown, optionally, the end face of the first end of the blade connecting adapter 13 is inclined at a certain angle relative to the end face of the second end of the blade connecting adapter 13. The end faces of the first end and the second end of the blade connecting adapter 13 are respectively connected to the first pitch bearing 12 and the second pitch bearing 14. By making these two end faces of the blade 20 adapter also inclined to each other, they can fit more closely and match the two pitch bearings. Thus, the structural design of the blade connecting adapter 13 achieves the mutual inclination of the two pitch bearings. During installation, it is only necessary to install the two pitch bearings onto the blade connecting adapter 13, without spending a lot of time adjusting the inclination angle of the two pitch bearings, which can effectively improve installation efficiency and reliability. As an example, the inclination angle of the end face of the first end of the blade 20 adapter can be consistent with the designed inclination angle of the first pitch bearing 12, or it can be different. These are all implementation methods of this disclosure. The same applies to the second end of the blade 20 adapter. This disclosure does not limit this.

[0048] like Figures 1 to 3As shown, the normal direction of the end face of the second end of the blade connecting adapter 13 and the axial direction of the second pitch bearing 14 are both matched with the span direction of the blade 20. By matching the axial direction of the second pitch bearing 14 directly connected with the blade 20 with the span direction of the blade 20, and by designing the second end of the blade connecting adapter 13 accordingly, the second pitch bearing 14 can be used as a conventional pitch bearing, that is, the matching relationship between the blade 20 and the second pitch bearing 14 remains the same as in the related art, so that the existing blade 20 can be directly used without the need to redesign and produce the blade 20, which helps to reduce the structural optimization cost. It should be understood that in other embodiments of the present disclosure, the axial direction of the first pitch bearing 12 can be matched with the span direction of the blade 20, in which case the second pitch bearing 14 is inclined relative to the first pitch bearing 12, so that the matching relationship between the second pitch bearing 14 and the blade 20 is different from that in the related art, and thus the structure of the blade 20 needs to be improved.

[0049] Regarding the structure of the hub 11, in some embodiments, as shown in Figure 1 and Figure 2 The bearing mounting portion 112 is integrated on the hub body 111, that is, the bearing mounting portion 112 is constructed by improving the hub structure, so that an integrated structure can be achieved.

[0050] In other embodiments, as shown in Figure 3 The hub 11 includes a hub body 111 and at least two bearing mounting portions 112 connected with each other. For the case where the second pitch bearing 14 is used as a conventional pitch bearing, the first pitch bearing 12 needs to be inclined, so that the orientation of the bearing mounting portion 112 connected with the first pitch bearing 12 is different from that of the pitch bearing mounting structure on the existing hub. By providing the bearing mounting portion 112 as a separate component, the inclined mounting of the first pitch bearing 12 can be achieved by additionally connecting the separate bearing mounting portion 112, so that the existing hub can be used as the hub body 111, without the need to redesign and produce the hub 11, which helps to further reduce the structural optimization cost.

[0051] In the above-mentioned other embodiments, further optionally, the normal direction of the end face of the hub body 111 towards the bearing mounting portion 112 is matched with the span direction of the blade 20, that is, the existing hub is used as the hub body 111, so that the structural optimization cost is reduced. As an example, as shown in Figure 3 Since the pitch bearing mounting structure on the existing hub has an opening, a support structure can be further provided at the opening to improve the connection strength between the hub body 111 and the bearing mounting portion 112, of course, the support structure can also not be provided, and other feasible designs can be used to ensure the connection strength, which is not limited in the present disclosure.

[0052] Optionally, corresponding to the same blade 20, the number of the first variable pitch bearing 12 is at least one, the blade connecting adapter 13 comprises at least one adapter subsegment, the number of the adapter subsegment is equal to the number of the first variable pitch bearing 12, and in the case where the number of the first variable pitch bearing 12 is greater than one, two adjacent adapter subsegments are connected through a variable pitch bearing. By setting at least one new first variable pitch bearing 12, and splitting the blade connecting adapter 13 into multiple adapter subsegments when multiple first variable pitch bearings 12 are set, the flexibility of the scheme can be improved to meet more blade 20 rotation requirements. As an example, as mentioned above, the adjusted tilt direction of the blade 20 is limited by the tilt direction of the newly added variable pitch bearing, so at least two variable pitch bearings with opposite tilt directions relative to the conventional variable pitch bearing (i.e. the second variable pitch bearing 14 in this embodiment) can be added for the same blade 20, so that the blade 20 can be rotated to different tilt directions as needed to meet more blade 20 adjustment requirements. Of course, only one variable pitch bearing with a tilt direction can also be added for the same blade 20 (when multiple variable pitch bearings are added, these variable pitch bearings with the same tilt direction can have different tilt degrees), and the number and / or tilt direction of the variable pitch bearings added for different blades 20 can be the same or different, which is not limited by the present disclosure.

[0053] Further optionally, in the case where the number of the first variable pitch bearing 12 is greater than one, in the initial installation state, each first variable pitch bearing 12 is sequentially distributed along the extension direction of the blade connecting adapter 13, and gradually tilts in the same direction according to the distribution arrangement order. By gradually tilting the multiple first variable pitch bearings 12 according to the arrangement order in the initial installation state, the installation order of each adapter subsegment can be clearly determined during the installation stage, and different degrees of blade tilt control can be easily achieved during the operation stage, improving the convenience of use in practice. It should be understood that the gradual tilting referred to here means gradual tilting in the initial installation state, and during the operation process, the rotation of the first variable pitch bearing 12 in the three-dimensional space will affect the tilt angle of other variable pitch bearings, for example Figure 1 As shown, the first variable pitch bearing 12 originally tilts in the clockwise direction relative to the second variable pitch bearing 14, but after the first variable pitch bearing 12 is rotated by 180°, as shown in Figure 2As shown, the first pitch bearing 12 becomes tilted to the counterclockwise direction relative to the second pitch bearing 14, thus when multiple first pitch bearings 12 are provided, the tilting of each first pitch bearing 12 will change after rotation, instead of gradually tilting, which is a change that is inevitably caused by structural limitations, thus still belongs to the embodiments protected by the present disclosure. It should also be understood that for embodiments in which first pitch bearings 12 with different tilting directions relative to the second pitch bearing 14 are added to the same blade 20, these first pitch bearings 12 can still gradually tilt to the same direction in the order of arrangement, that is, arrange each first pitch bearing 12 in the order of gradually tilting to the same direction when assembling. For example, for the same blade 20, referring to Figure 1 The positions and directions shown, at this time, there will be a part of the first pitch bearing 12 tilted to the clockwise direction relative to the second pitch bearing 14, and another part of the first pitch bearing 12 tilted to the counterclockwise direction relative to the second pitch bearing 14, the first pitch bearing 12 tilted to the clockwise direction can be arranged in the order of gradually decreasing tilting degree first, and then the first pitch bearing 12 tilted to the counterclockwise direction can be arranged in the order of gradually increasing tilting degree, of course, since each pitch bearing itself does not tilt, the specific implementation is to arrange each adapter segment of the blade connecting adapter 13 in order when assembling. It should also be understood that in other embodiments of the present disclosure, each first pitch bearing 12 can also be distributed in a non-gradual tilting manner in the initial installation state, which is not limited by the present disclosure.

[0054] As Figures 1 to 3 shown, optionally, the hub assembly 10 according to the embodiments of the present disclosure further comprises a pitch driving system, the number of the pitch driving system is equal to and one-to-one corresponds to the number of the pitch bearing in the hub assembly 10, and different pitch driving systems corresponding to the same blade 20 operate independently. By configuring an independently operating pitch driving system for each pitch bearing in the hub assembly 10, independent driving of each pitch bearing rotation can be achieved, ensuring reliable operation of the embodiments of the present disclosure. It should be understood that this embodiment means that the pitch driving system is also included in the hub assembly 10, and is generated and assembled as a whole in advance, in other embodiments, the pitch driving system can also not be included in the hub assembly 10, but be generated separately, and be installed to the corresponding position of each pitch bearing of the hub assembly 10 when the wind wheel or wind turbine generator set needs to be assembled, which is also an implementation of the present disclosure.

[0055] Next, the hub assembly 10 of two specific embodiments of the present disclosure will be introduced. Figures 1 to 3

[0056] As Figure 1 and Figure 2 ​The illustration shows a specific embodiment of this disclosure. In this embodiment, the hub assembly 10 includes a hub 11, a first pitch bearing 12, a blade connection adapter 13, a second pitch bearing 14, a first pitch drive system 15, a second pitch drive system 16, a first web 17, a second web 18, and connecting standard parts (studs or bolts), among other key components. The first pitch bearing 12 includes a mating outer bearing ring 121 and a mating inner bearing ring 122. The outer bearing ring 121 is fixedly connected to the bearing mounting portion 112 of the hub 11 by bolts, and the inner bearing ring 122 is fixedly connected to the blade connection adapter 13 by studs. The first pitch drive system 15 is fixed on the first web 17 at the bearing mounting portion 112 and mates with the inner bearing ring 122. The second pitch bearing 14 includes a mating outer ring 141 and an inner ring 142. The outer ring 141 is fixedly connected to the blade connection adapter 13 via a double-ended stud. The inner ring 142 is connected to the blade root flange (not shown in the figure) of the blade 20. The second pitch drive system 16 is fixed on the second web 18 located at the second end of the blade connection adapter 13 and mates with the inner ring 142. The first pitch drive system 15 drives the first pitch bearing 12, and the second pitch drive system 16 drives the second pitch bearing 14. Both pitch drive systems can be further divided into a pitch motor and a pitch reducer (not shown in the figure). The pitch reducer can directly mesh with the inner ring of the corresponding pitch bearing, or a pinion can be provided at the bottom of the pitch reducer, which meshes with the inner ring of the corresponding pitch bearing to drive the inner ring of the corresponding pitch bearing to rotate relative to the outer ring, thereby realizing the rotation of the corresponding pitch bearing. The form of the pitch drive system is not limited and can be electric pitch or hydraulic pitch. Both pitch drive systems have independent pitch control systems and are independently controlled through the main control system of the wind turbine generator.

[0057] like Figure 3 The illustration shows another specific embodiment of this disclosure. The difference between this embodiment and the previous embodiment is that, in the previous embodiment, the hub 11 includes an integrated hub body 111 and a bearing mounting portion 112, while in this embodiment, the hub 11 includes two connected parts: the hub body 111 and the bearing mounting portion 112. In this embodiment, the two pitch bearings and the two pitch drive systems have the same structure and function, and will not be repeated here.

[0058] like Figures 1 to 3As shown, another embodiment of this disclosure provides a wind turbine, which includes a hub assembly 10 and blades 20 as described above. The blades 20 are rotatably mounted on a blade connecting adapter 13 via a second pitch bearing 14. This wind turbine includes the hub assembly 10 as described above, and thus possesses all the beneficial technical effects of the hub assembly 10, which will not be repeated here.

[0059] like Figure 4 As shown, another embodiment of this disclosure provides a wind turbine generator set, which includes a wind turbine, a nacelle 30, and a tower as described above. The nacelle 30 is connected to the leeward side of the wind turbine, and the tower is supported at the bottom of the nacelle 30. This wind turbine generator set includes the wind turbine as described above, which also includes the hub assembly 10 as described above, and therefore possesses all the beneficial technical effects of the hub assembly 10, which will not be elaborated further here. Furthermore, the application of the embodiments of this disclosure is not limited to the overall turbine technology route, and can be applied to direct-drive, semi-direct-drive, and high-speed doubly-fed turbine generator sets.

[0060] The following section describes the operation of a wind turbine generator set, using the second pitch bearing 14 as a standard pitch bearing and two first pitch bearings 12 with opposite tilt directions relative to the second pitch bearing 14 (this applies to all three blades 20). To facilitate differentiation between the two first pitch bearings 12 of the same blade 20, the following will be used... Figures 1 to 3 The first pitch bearing 12 tilted in the indicated direction is defined as the first forward pitch bearing (used to tilt the blade 20 forward), and the first pitch bearing 12 tilted in the opposite direction is defined as the first backward pitch bearing (used to tilt the blade 20 backward). Accordingly, the two first pitch drive systems 15 are defined as the first forward pitch drive system and the first backward pitch drive system, respectively.

[0061] When the unit is operating normally (e.g., by measuring wind with lidar and ensuring wind direction, speed, and other wind parameters are within safe ranges), the main control system can control the operation of the second pitch drive system 16 of the three blades 20, driving the second pitch bearing 14 to rotate, thereby causing the three blades 20 to pitch and achieve normal power generation. Simultaneously, the main control system keeps the first pitch drive system 15 of the three blades 20 locked. The unit's operating status in this scenario is as follows: Figure 4 As shown. At this time, the unit is in normal power generation mode, with a large swept area, and the unit can generate more electricity, resulting in better power generation revenue.

[0062] When the generator encounters extreme wind conditions, it uses a disaster early warning platform or intelligent devices such as lidar to predict wind direction and speed in advance and transmits this information to the main control system. If the wind speed is not detected to exceed the generator's operating limit, the main control system, through the pitch control system, switches the first backward pitch drive system of one blade 20 and the first forward pitch drive systems of two blades 20 into operational mode, while locking the second pitch drive systems 16 of all three blades 20. The generator then controls the first pitch drive systems 15 of the three blades 20 that are in operation to work independently, driving the corresponding first pitch bearings 12 to rotate 180°. Figure 5 As shown, this causes one blade 20 to tilt backward, and then causes two other blades 20 to tilt forward. The unit continues to operate, but because the swept area is reduced, the load on the unit decreases, resulting in a corresponding loss in power generation, thus improving the unit's adaptability.

[0063] When the generator unit encounters extreme wind conditions, if the unit can predict in advance through a disaster early warning platform or intelligent equipment such as lidar that the wind speed is further increasing and exceeds the unit's wind speed limit, the main control system will, on the one hand, [follow a specific action]. Figure 6 The tilting direction of the blades 20 is controlled so that all three blades 20 tilt backward. On the other hand, as shown... Figure 7 The distribution of the three blades 20 is controlled, causing the hub 11 to rotate until the three blades 20 are in an "inverted Y" orientation, that is, facing the nacelle 30, the three blades 20 are oriented towards the 12 o'clock, 4 o'clock, and 8 o'clock positions respectively, and the unit is stopped. At this time, because the blades 20 are in an "inverted Y" orientation, it is ensured that the blades 20 at the 4 o'clock and 8 o'clock positions pass over the tower 40, reducing the risk of damage to the unit. In specific execution, the distribution of the three blades 20 can be controlled as follows: Figure 5 The three blades 20 shown are rotated so that the backward-tilting blade 20 is rotated to the 12 o'clock position, making the three blades 20 appear as follows: Figure 7 The system displays an "inverted Y" orientation. Then, it controls the first forward tilt pitch drive system of the two forward tilt blades 20 at the 4 o'clock and 8 o'clock positions to drive the corresponding first forward tilt pitch bearings to rotate 180° to reset and lock. Next, it controls the first backward tilt pitch drive system of these two reset blades 20 to drive the corresponding first backward tilt pitch bearings to rotate 180°. Figure 6 As shown, this causes the two reset blades to tilt backward, and finally the unit stops.

[0064] When the generator unit predicts, via a disaster early warning platform or intelligent equipment such as lidar, that extreme wind conditions have ended, the unit's main control system first resets and then locks each of the first pitch drive systems 15, and then controls each of the second pitch drive systems 16 to switch to operating status, allowing the unit to resume normal power generation. Figure 4 As shown.

[0065] The present disclosure proposes a hub assembly 10, a wind wheel and a wind turbine generator set, by setting two variable pitch bearings with different axial directions between the hub 11 and the blade 20, the switching work of the two variable pitch bearings can be realized, one of the variable pitch bearings can realize the conventional variable pitch function, which can ensure that the set generates more electricity in the normal state and brings more benefits, and the other variable pitch bearing can realize the adjustment of the blade 20 in extreme wind conditions, which can rotate the blade 20 from the conventional position to the rear side of the nacelle 30 of the wind turbine generator set or the front side of the wind wheel, and then reduce the radius of the swept circle and the swept area by tilting the blade 20, thereby reducing the load of the wind turbine generator set using the hub assembly 10, which can improve the safety and reliability of the blade 20 and the nose of the set in extreme wind conditions, reduce the risk of tower collapse, and reduce the loss of power generation in extreme wind conditions, and improve the applicability of the set.

[0066] At the same time, this scheme only needs to make a simple change to the hub structure to reduce the load of the whole machine, compared with the solution of increasing the design strength of the set, which can not only reduce the design weight of the nose components, thereby further reducing the manufacturing cost of the set, but also can be quickly implemented and applied on the whole machine, and can reduce the dependence on the accuracy of the estimated limit design wind speed (the existing scheme needs to design the structural strength of the set according to the estimated limit design wind speed, so if the actual limit wind speed is too large, the tower may still collapse), even in the face of uncertain extreme wind conditions, it can also more reliably reduce the risk of tower collapse.

[0067] In addition, the application scenarios of the embodiments of the present disclosure are wide, from the perspective of the hub assembly, it can be applied to the form with or without a fairing, from the perspective of the variable pitch system, it can be applied to electric variable pitch, gear variable pitch, hydraulic variable pitch or other variable pitch forms, from the perspective of the whole machine, it is not limited to the whole machine technology route, and can be applied to direct drive, semi-direct drive and high-speed doubly-fed sets, and has the feasibility of promotion in the industry.

[0068] The specific embodiments of the present disclosure are described in detail above, although some embodiments have been shown and described, those skilled in the art should understand that modifications and variations can be made to these embodiments without departing from the principles and spirits of the present disclosure, which are defined by the claims and their equivalents, and these modifications and variations should also be within the protection scope of the claims of the present disclosure.

Claims

1. A wheel hub assembly (10) characterized by, The hub assembly (10) comprises: a hub (11) having at least two bearing mounting portions (112); a first variable pitch bearing (12) mounted on the bearing mounting portion (112); a blade connecting adapter (13) having a first end rotatably mounted on the bearing mounting portion (112) through the first variable pitch bearing (12); and a second variable pitch bearing (14) mounted on a second end of the blade connecting adapter (13) for connecting with a blade (20), an axial direction of the second variable pitch bearing (14) being inclined at an angle relative to an axial direction of the first variable pitch bearing (12).

2. The hub assembly (10) according to claim 1, wherein an end surface of the first end of the blade connecting adapter (13) is inclined at an angle relative to an end surface of the second end of the blade connecting adapter (13).

3. The hub assembly (10) according to claim 2, wherein a normal direction of the end surface of the second end of the blade connecting adapter (13) and the axial direction of the second variable pitch bearing (14) are both matched with a spanwise direction of the blade (20).

4. The hub assembly (10) according to claim 3, wherein the hub (11) comprises a hub body (111) and the at least two bearing mounting portions (112) connected together.

5. The hub assembly (10) according to claim 4, wherein a normal direction of an end surface of the hub body (111) facing the bearing mounting portion (112) is matched with the spanwise direction of the blade (20).

6. The hub assembly (10) according to claim 3, wherein corresponding to the same blade (20), the number of the first variable pitch bearings (12) is at least one, the blade connecting adapter (13) comprises at least one adapter sub-section, the number of the adapter sub-sections is equal to the number of the first variable pitch bearings (12), and in the case that the number of the first variable pitch bearings (12) is more than one, two adjacent adapter sub-sections are connected through a variable pitch bearing.

7. The hub assembly (10) according to claim 6, wherein in the case that the number of the first variable pitch bearings (12) is more than one, in an initial installation state, each of the first variable pitch bearings (12) is sequentially distributed along an extension direction of the blade connecting adapter (13) and gradually inclined in the same direction according to the distribution order.

8. The hub assembly (10) of any one of claims 1 to 7, wherein, The hub assembly (10) further comprises: a variable pitch driving system, the number of the variable pitch driving systems is equal to and one-to-one corresponding to the number of the variable pitch bearings in the hub assembly (10), and different variable pitch driving systems corresponding to the same blade are independently operated.

9. A wind wheel, characterized in that The wind wheel comprises: the hub assembly (10) according to any one of claims 1 to 8; and a blade (20) rotatably mounted on the blade connecting adapter (13) through the second variable pitch bearing (14).

10. A wind power unit, characterized in that The wind turbine generator set comprises: the wind wheel according to claim 9; A nacelle (30) is connected at the leeward side of the wind wheel; and A tower drum (40) is supported at the bottom of the nacelle (30).

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