Hub assembly and wind generating set

Abstract

The embodiment of the utility model provides a hub assembly and a wind generating set. The hub assembly comprises a hub, the hub is provided with two blade connecting ports which are distributed in an axial symmetry mode, at least two driving via holes are formed in the position, close to each blade connecting port, of the hub, and the at least two driving via holes are distributed around the center line of each blade connecting port in the circumferential direction at intervals; the two variable pitch bearings are arranged at the connecting ports of the two blades in a one-to-one correspondence manner; the two driving webs are connected with the two variable-pitch bearings in a one-to-one correspondence manner, so that the driving webs can rotate relative to the hub through inner rings and outer rings of the variable-pitch bearings; and each driving assembly is rotationally connected with one driving web plate, each driving assembly comprises at least two driving parts, the at least two driving parts penetrate through the at least two driving via holes in a one-to-one correspondence mode, stretch into the hub and are rotationally connected with the driving web plates, and the at least two driving parts can stretch and retract to enable the driving web plates to rotate. The driving radius can be increased, and the variable-pitch requirement is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of wind power generation, and particularly relates to a hub assembly and a wind turbine generator. BACKGROUND

[0002] Compared with the traditional three-blade fan, the two-blade fan reduces a set of blades, a variable pitch bearing and a driving mechanism, and reduces the impeller weight, thereby having a cost competitive advantage in the market. With the continuous increase of the power of the wind turbine generator, the driving torque at the blade root is also increasing, but the space of the blade root flange position cannot be increased unlimitedly due to the weight and cost considerations. The driving radius of the current variable pitch mechanism of the two-blade fan is limited and cannot meet the variable pitch demand of the gradually developed wind turbine generator. SUMMARY

[0003] Therefore, the utility model aims to provide a hub assembly and a wind turbine generator, which can increase the driving radius, thereby meeting the variable pitch demand of the wind turbine generator.

[0004] The first aspect embodiment of the utility model provides a hub assembly, which comprises: a hub, the hub is provided with two blade connection ports which are distributed in axial symmetry, at least two driving through holes are arranged at positions close to each blade connection port on the hub, and the at least two driving through holes are distributed in a circumferential direction and are spaced apart around the center line of the blade connection port; two variable pitch bearings are arranged at the two blade connection ports in one-to-one correspondence; two driving webs are connected with the two variable pitch bearings in one-to-one correspondence, so that the driving web can rotate relative to the hub through the inner ring and the outer ring of the variable pitch bearing; two groups of driving assemblies are rotationally connected with one driving web, each group of driving assembly comprises at least two driving members, the at least two driving members pass through the at least two driving through holes and are rotationally connected with the driving web, and the at least two driving members can be elongated and retracted to rotate the driving web.

[0005] Further, in some embodiments, the hub is further provided with a main shaft connection port, and the distance between any driving through hole and the plane where the main shaft connection port is located is greater than or equal to one third of the diameter of the blade connection port.

[0006] Further, in some embodiments, the hub is further provided with a main shaft connection port, and the hub is provided with two driving through holes at positions close to each blade connection port, and the center line of each driving through hole is perpendicular to the orthogonal projection of the center line of the main shaft connection port on the driving web.

[0007] Further, in some embodiments, in the retracted state, the length of the driving member is less than half of the length of the driving member.

[0008] Further, in some embodiments, a support frame is arranged on both sides of each driving through hole on the hub, and the driving member is rotatably arranged on the support frame through a pin shaft.

[0009] Further, in some embodiments, the driving member comprises a fixed component and a moving component, the moving component can be extended or retracted by the fixed component, the moving component is rotatably connected with the driving web, and the fixed component is rotatably connected with the support frame.

[0010] Further, in some embodiments, the hub assembly further comprises two groups of mounting seats, each group of mounting seats is fixed on one driving web, each group of mounting seats comprises at least two mounting seats, a connecting shaft is arranged on each mounting seat, and one end of each driving member is connected with one connecting shaft.

[0011] Further, in some embodiments, the mounting seat comprises an upper blocking rib, a lower blocking rib and a connecting rib, the connecting rib is connected at one end of the upper blocking rib and the lower blocking rib, so that the upper blocking rib and the lower blocking rib have an arc-shaped gap extending in the circumferential direction, and the middle part of the gap faces the driving member; the connecting shaft passes through the upper blocking rib and the lower blocking rib, and one end of the driving member is sleeved on the connecting shaft and located between the upper blocking rib and the lower blocking rib.

[0012] Further, in some embodiments, the driving member is a hydraulic cylinder or an electric push rod or a turbine worm structure.

[0013] Further, in some embodiments, the main body part of the hub is in a bent pipe shape, and the two blade connection ports are located at two ends of the bent pipe shape.

[0014] The second aspect embodiment of the utility model provides a wind turbine generator, which comprises the hub assembly of any one of the above embodiments.

[0015] The hub assembly provided by the utility model embodiment, the two blade connection ports on the hub are distributed in axial symmetry, which is beneficial to the central symmetry of the blades, thereby reducing the possibility of hub center load deviation. Each driving web is driven to rotate by at least two driving members, and part of each driving member extends into the hub, and the other part extends out of the hub, which can reduce the space occupation near the driving web in the hub, increase the driving radius, meet the variable pitch demand of the gradually developed wind turbine generator, reduce the additional load, and improve the driving torque. Moreover, part of the driving member is located on the outer side of the hub, which is convenient for subsequent operation and maintenance. Once the maintenance operation of replacing the driving member is required, the wind turbine generator is only needed to be stopped, the parts for fixing the driving member are removed, and then the driving member can be taken out from the outer side of the hub, thereby avoiding the trouble of transporting the driving member to the inside of the hub.

[0016] The wind generating set provided by the embodiment of the utility model has the hub assembly provided by any one of the above embodiments, and thus has the beneficial effects of any one of the above embodiments, which will not be repeated here.

[0017] Further aspects and / or advantages of the overall concept of the utility model will be in part apparent only when the utility model is described in the following description and / or will be apparent only when the utility model is described and / or becomes clear from the description, or can be learned from the practice of the overall concept of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and other objects and features of the utility model will become more apparent from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

[0019] Figure 1 A front view schematic diagram of a hub assembly of one embodiment of the application is shown;

[0020] Figure 2 A side view schematic diagram of a hub assembly of one embodiment of the application is shown;

[0021] Figure 3 A longitudinal section view schematic diagram of a hub assembly of one embodiment of the application is shown.

[0022] Figures 1 to 3 Explanation of the reference signs:

[0023] 100 hub; 110 blade connecting port; 120 main shaft connecting port; 130 driving via hole; 140 support frame; 150 pin shaft; 200 variable pitch bearing; 300 driving web; 310 mounting seat; 311 upper blocking rib; 312 lower blocking rib; 320 connecting shaft; 330 lightening through hole; 400 driving piece; 410 fixed part; 420 moving part. DETAILED DESCRIPTION

[0024] The following detailed description is provided to help the reader obtain a complete understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of the operations described herein is only an example, and is not limited to those set forth herein, but can be changed as will be apparent after understanding the disclosure of the present application, except for the operations that must occur in a specific order. In addition, the description of features known in the art can be omitted for the sake of clarity and brevity.

[0025] The features described herein can be implemented in different ways depending upon the example being implemented. The examples described herein are not implemented as limiting but to illustrate only some of the many possible implementations of the methods, devices, and / or systems described herein, which implementations will be apparent to those skilled in the art after understanding the disclosure provided.

[0026] 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.

[0027] Although terms such as "first", "second", and "third" can be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections should not be limited by these terms. Instead, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, the first element, the first component, the first region, the first layer or the first section referred to in the examples described herein can also be called the second element, the second component, the second region, the second layer or the second section without departing from the teachings of the examples.

[0028] In the specification, when an element such as a layer, a region, or a substrate is referred to as "on" another element, "connected to" or "coupled to" another element, it can be "directly on" the other element, "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 referred to as being "directly on" another element, "directly connected to" or "directly coupled to" another element, there are no other elements interposed therebetween.

[0029] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has", "having" as used herein, specify the presence of stated features, numbers, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, components, elements, and / or combinations thereof. The term "plurality" represents any number of two or more.

[0030] In the present application, the terms "above", "below", "top", "bottom", and the like, are defined based on the orientation of the product in the normal use state, unless otherwise specified.

[0031] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Unless explicitly stated otherwise, terms such as, for example, "comprise", "comprising", "comprises", "including", "including", "include" or "includes" are to be construed as allowing for "optional features" of the respective processes, devices, systems or methods. Unless explicitly stated otherwise, terms such as, for example, "comprise", "comprising", "comprises", "including", "including", "include" or "includes" are to be construed as allowing for "optional features" of the respective processes, devices, systems or methods.

[0032] The embodiments of the present application will be described below with reference to the accompanying drawings. Figures 1 to 3 The embodiments of the present application provide a hub assembly and a wind turbine generator set having the same.

[0033] As shown in the drawings, an embodiment of the present application provides a hub assembly for a wind turbine generator set. Figures 1 to 3 As shown in the drawings, an embodiment of the present application provides a hub assembly for a wind turbine generator set.

[0034] The hub assembly comprises a hub 100, and the hub 100 has two blade connection ports 110 which are symmetrically distributed about an axis. The hub assembly further comprises two variable pitch bearings 200 and two drive webs 300, the two variable pitch bearings 200 are arranged at the two blade connection ports 110 one by one in a corresponding manner; the two drive webs 300 are connected with the two variable pitch bearings 200 one by one in a corresponding manner, so that the drive web 300 can rotate relative to the hub 100 through the inner ring and the outer ring of the variable pitch bearing 200. The drive web 300 is used to connect with the blade, so that the blade can rotate relative to the hub 100 with the rotation of the drive web 300, and the variable pitch is realized.

[0035] In the embodiment, the hub 100 can be connected with two blades through the drive web 300, and a double-blade wind turbine generator set can be realized. Compared with a conventional three-blade wind turbine generator set, the number of parts can be reduced, the weight of the impeller can be reduced, the cost can be saved, and the product competitiveness can be increased. Moreover, the two blade connection ports 110 on the hub 100 are symmetrically distributed about an axis, so that the two blades can also be symmetrically distributed about a center, and the possibility of center load imbalance of the hub 100 can be reduced.

[0036] As shown in the drawings, an embodiment of the present application provides a hub assembly for a wind turbine generator set. Figure 1 and Figure 3 As shown in the drawings, an embodiment of the present application provides a hub assembly for a wind turbine generator set. The hub 100 is provided with at least two drive through holes 130 near each blade connection port 110, and the at least two drive through holes 130 are circumferentially spaced around the center line of the blade connection port 110. The hub assembly further comprises two groups of drive assemblies, each group of drive assemblies is rotationally connected with one drive web 300, and each group of drive assemblies comprises at least two drive members 400, the at least two drive members 400 pass through the at least two drive through holes 130 into the hub 100 one by one and are rotationally connected with the drive web 300, and the at least two drive members 400 can be elongated and retracted to rotate the drive web 300.

[0037] Herein each driving web 300 is driven to rotate by at least two driving members 400, and a part of each driving member 400 extends into the inside of the hub 100 through the driving through-hole 130 to connect with the driving web 300, and another part extends out of the hub 100, which can greatly reduce the space occupation near the driving web 300 in the inside of the hub 100, and can increase the driving radius in the limited rotation space, thus being beneficial to reduce the diameter size of the driving member 400, thereby reducing the cost of the driving member 400. Moreover, with the gradual development of the pitch demand of the wind turbine generator, the adoption of at least two driving members 400 extending out to control the rotation of the driving web 300 can reduce the additional load and obtain sufficient driving torque, thereby improving the driving torque.

[0038] In addition, a part of the driving member 400 is located outside the hub 100, which is convenient for subsequent operation and maintenance. Once the maintenance operation of replacing the driving member 400 occurs, only the hub 100 needs to be stopped, and the parts for fixing the driving member 400, such as the pin shaft 150, are removed, so that the driving member 400 can be taken out from the outside of the hub 100, avoiding the trouble of transporting the driving member 400 to the inside of the hub 100, and solving the problem of insufficient maintenance space due to the small space in the hub 100.

[0039] It is worth noting that the center line of the blade connecting port 110 is perpendicular to the driving web 300 in the embodiment. In addition, each driving web 300 is farther away from the center of the hub 100 than at least two adjacent driving through-holes 130, and is located outside at least two driving members 400, which is convenient for connecting with the pitch bearing 200 and the blade.

[0040] Further, the driving member 400 is a hydraulic cylinder. It has good reliability and can drive large load to move.

[0041] In specific applications, the hydraulic cylinder controls the extension length of the hydraulic cylinder rod according to the hydraulic oil pressure output by the valve group of the hydraulic pump station, thereby controlling the relative position of the driving web 300 in the hub 100, determining the rotation angle of the inner ring of the pitch bearing 200, and achieving the purpose of accurately controlling the rotation angle of the blade.

[0042] Of course, the driving member 400 can also be other driving components, such as an electric push rod or a worm gear structure, etc.

[0043] Further, as shown in Figure 3 Each group of driving assemblies is distributed equidistantly around the center line of the blade connecting port 110. Similarly, at least two driving members 400 in each group of driving assemblies are distributed equidistantly around the center line of the blade connecting port 110. This is beneficial to stably control the rotation of the driving web 300.

[0044] Of course, the at least two driving through holes 130 can also not be distributed equidistantly around the center line of the blade connecting port 110. For example, in order to avoid interference with the main shaft, the cabin, etc. connected to the hub 100, the driving member 400 is arranged far away from the main shaft, so that the driving member 400 can be prevented from rotating and interfering with the main shaft during driving.

[0045] Further, as shown in Figures 1 to 3 , the hub 100 also has a main shaft connecting port 120, which is used to connect the main shaft of the wind turbine generator set.

[0046] Among them, the two blade connecting ports 110 and the main shaft connecting port 120 can be distributed in three ends of a T shape. The hub 100 is roughly in a T shape. Such a T-shaped symmetrical structure design can reduce the possibility of center load deviation of the hub 100 and facilitate processing.

[0047] In addition, the main shaft is usually arranged in the cabin of the wind turbine generator set. In the case of each driving assembly including at least two driving members 400, there is a risk of interference with the cabin during driving of the driving member 400. Therefore, further, in some embodiments, the distance between any one driving through hole 130 and the plane where the main shaft connecting port 120 is located is greater than or equal to one third of the diameter of the blade connecting port 110. The probability of interference between the driving member 400 and the cabin can be reduced.

[0048] As an example, the distance between the center of each driving through hole 130 and the plane where the main shaft connecting port 120 is located is one half or five thirds of the diameter of the blade connecting port 110, etc.

[0049] As an example, as shown in Figure 2 and Figure 3 , each driving assembly includes two driving members 400, and the hub 100 is provided with two driving through holes 130 near each blade connecting port 110, and the distance between the centers of the two driving through holes 130 and the main shaft connecting port 120 is approximately equal to the radius of the blade connecting port 110. In this way, during driving of the driving member 400, even if the driving member 400 rotates to the position shown in Figure 3 , the distance from the main shaft connecting port 120 is far, and the driving member 400 will not interfere with the cabin.

[0050] Further, in some embodiments, as shown in Figure 2 and Figure 3As shown, two driving through holes 130 are arranged on the hub 100 near the connection port 110 of each blade, and the center lines of each driving through hole 130 are perpendicular to the normal projection of the center line of the main shaft connection port 120 on the driving web 300. It is worth mentioning that the center line of the main shaft connection port 120 theoretically overlaps the axis of the main shaft. Such a design can ensure that the driving member 400 extending from the hub 100 does not interfere with the nacelle when the wind turbine generator set is running.

[0051] Further, in some embodiments, as shown in the drawings, Figure 3 As shown, in the retracted state, less than half of the length of the driving member 400 extends into the hub 100 through the driving through hole 130. On the one hand, it can reduce the occupation of the internal space of the hub 100 as much as possible; on the other hand, it can effectively increase the driving radius, make it more convenient to rotate the driving web 300, improve the driving torque, and meet the requirement of larger blade root load.

[0052] For example, in the retracted state, one third of the length of the driving member 400 is connected with the driving web 300 through the driving through hole 130, or one fourth of the length of the driving member 400 is connected with the driving web 300 through the driving through hole 130. Or only the head of one end of the driving member 400 extends into the hub 100 and is connected with the driving web 300 through the driving through hole 130. The shorter the length of the driving member 400 extending into the driving through hole 130, the farther the connection position of the driving member 400 and the driving web 300 from the center of the driving web 300, so as to facilitate the increase of the driving radius, the improvement of the driving torque, and the rotation of the blade with large load.

[0053] Further, in some embodiments, as shown in the drawings, Figures 1 to 3 As shown, a support frame 140 is arranged on both sides of each driving through hole 130 on the hub 100, and the driving member 400 is rotatably arranged on the support frame 140 through a pin shaft 150. The axis of the pin shaft 150 is parallel to the rotation center line of the driving web 300, so as to ensure that the driving member 400 can rotate around the pin shaft 150 and drive the driving web 300 to rotate while being elongated. Moreover, the support frame 140 is arranged on both sides of the driving through hole 130 to support the pin shaft 150, and then support the driving web 300, which is conducive to improving the installation stability of the driving web 300, so as to ensure that the driving web 300 can be pulled to rotate with the support of the support frame 140.

[0054] For example, the support frame 140 is a support ear, and the support ear has a insertion hole for the pin shaft 150 to be inserted.

[0055] Of course, the support frame 140 can not be arranged on both sides of the driving through hole 130, and the support frame 140 can not be a support ear structure, as long as the driving member 400 is effectively fixed on the hub 100 and does not affect the rotation of the driving web 300.

[0056] Further, as shown in Figure 3 , the support frame 140 is arranged on the outer surface of the hub 100. It is convenient for maintenance personnel to install the driving member 400 on the support frame 140 outside the hub 100, and it is also convenient for maintenance personnel to disassemble the driving member 400 outside the hub 100. The driving member 400 is convenient to disassemble.

[0057] Or further, the support frame 140 is arranged on the inner surface of the hub 100. In this way, when disassembling the driving member 400, only the connecting member, such as the pin shaft 150, connected between the driving member 400 and the support frame 140 can be disassembled inside the hub 100, and then the driving member 400 can be taken out from the outside. Or the pin shaft 150 is disassembled from the outside of the hub 100 through the driving through hole 130, and then the driving member 400 is taken out from the outside of the hub 100. The support frame 140 is arranged inside the hub 100, the outer surface of the hub 100 is relatively neat, convenient for transportation, and the convex support frame 140 is avoided from colliding with the surrounding structure during transportation of the hub 100.

[0058] Further, in some embodiments, as shown in Figure 3 , the driving member 400 includes a fixed part 410 and a moving part 420, the moving part 420 can be extended or retracted by the fixed part 410, the moving part 420 is rotationally connected with the driving web 300, and the fixed part 410 is rotationally connected with the support frame 140. By connecting the fixed part 410 with the support frame 140, the installation stability of the driving member 400 can be ensured, and the extension and retraction of the driving member 400 will not be affected.

[0059] Specifically, in the case of the driving member 400 being a hydraulic cylinder, the driving part is the cylinder body of the hydraulic cylinder, and the moving part 420 is a hydraulic rod, which can be extended and retracted in the cylinder body, thereby realizing the extension and retraction movement of the driving member 400.

[0060] Further, in some embodiments, as shown in Figure 3 , the hub assembly further includes: two groups of mounting seats 310, each fixed on one driving web 300, each group of mounting seats 310 includes at least two mounting seats 310, and each mounting seat 310 is provided with a connecting shaft 320, and one end of each driving member 400 is rotationally connected with one connecting shaft 320.

[0061] In these embodiments, a mounting base 310 is provided on the drive web 300, and a connecting shaft 320 is provided on the mounting base 310 to connect with the drive component 400. Compared with directly installing the connecting shaft 320 on the drive web 300, the structural strength of the drive web 300 is not affected, and it can ensure that the drive web 300 can drive the blade to rotate smoothly.

[0062] As an example, such as Figure 3 As shown, the mounting base 310 includes an upper stop rib 311, a lower stop rib 312, and a connecting rib (not shown in the figure). The connecting rib is connected to one end of the upper stop rib 311 and the lower stop rib 312, so that a circumferentially extending notch is formed between the upper stop rib 311 and the lower stop rib 312, with the middle part of the notch facing the driving member 400. The connecting shaft 320 passes through the upper stop rib 311 and the lower stop rib 312, and one end of the driving member 400 is sleeved on the connecting shaft 320 and located between the upper stop rib 311 and the lower stop rib 312.

[0063] In this example, the mounting base 310 is roughly U-shaped when viewed from the side. One end of the drive member 400 extends through the U-shaped notch between the upper baffle 311 and the lower baffle 312 and is rotatably connected to the connecting shaft 320. The mounting base 310 can limit the upper and lower positions of the drive member 400, preventing the drive member 400 from easily disengaging from the connecting shaft 320, thereby ensuring the reliability of the drive member 400.

[0064] Of course, the mounting base 310 can also have other structures, such as the mounting base 310 being I-shaped, etc., which will not be listed in detail here.

[0065] Furthermore, in some embodiments, such as Figure 1 As shown, the main body of the hub 100 is in the shape of a bent tube, and the two blade connection ports 110 are located at both ends of the bent tube. The main structure of the hub 100 is simple and easy to process.

[0066] As an example, the main body of the wheel hub 100 is formed into a curved tube structure by using a circular arc transition scanning modeling method, which can reduce the weight of the wheel hub 100 and at the same time reduce the difficulty of casting and machining the wheel hub 100.

[0067] Specifically, using one blade connection port 110 as a reference, the blade connection port 110 can be pulled along an arc to the other end to form another blade connection port 110. This 3D modeling forms the main structure of the hub 100, ensuring consistent wall thickness throughout the hub 100 and resulting in high structural strength. This arc can be a concave arc in the center, forming a shape similar to... Figure 1 The main structure of the wheel hub 100. Of course, the arc can also be an arc that convexes upwards in the middle.

[0068] Furthermore, in some embodiments, such as Figure 2As shown, the driving web plate 300 is provided with a lightening hole 330, which can reduce the weight of the driving web plate 300, thereby reducing the driving load.

[0069] The second aspect embodiment of the utility model provides a wind turbine generator system, including the hub assembly of any one of above-mentioned embodiments.

[0070] The wind turbine generator system provided by the embodiment of the aspect has the beneficial effects of any one of the above-mentioned embodiments, and details are not repeated here.

[0071] Although the embodiments of the utility model have been described in detail above, those skilled in the art can make various modifications and changes to the embodiments of the utility model without departing from the spirit and scope of the utility model. It should be understood that these modifications and changes will still fall within the spirit and scope of the embodiments of the utility model defined by the claims.

Claims

1. A wheel hub assembly, characterized by The hub assembly comprises: a hub (100) having two blade connection ports (110) distributed symmetrically around an axis on the hub (100), at least two drive through holes (130) being arranged on the hub (100) near each blade connection port (110), and the at least two drive through holes (130) being distributed circumferentially around a center line of the blade connection port (110); two pitch bearings (200) arranged one-to-one at the two blade connection ports (110); two drive webs (300) connected one-to-one with the two pitch bearings (200) so that the drive web (300) can rotate relative to the hub (100) via inner and outer rings of the pitch bearing (200); two groups of drive assemblies, each group of drive assemblies being rotationally connected with a drive web (300), each group of drive assemblies comprising at least two drive members (400) that pass through the at least two drive through holes (130) into the hub (100) and are rotationally connected with the drive web (300) one-to-one, and the at least two drive members (400) being capable of elongation and retraction to rotate the drive web (300).

2. The wheel hub assembly of claim 1, wherein, The hub (100) further has a main shaft connection port (120), and a distance between any drive through hole (130) and a plane on which the main shaft connection port (120) is located is greater than or equal to one-third of a diameter of the blade connection port (110).

3. The wheel hub assembly of claim 1, wherein, The hub (100) further has a main shaft connection port (120), and the hub (100) has two drive through holes (130) near each blade connection port (110), and a center line of each drive through hole (130) is perpendicular to a normal projection of a center line of the main shaft connection port (120) on the drive web (300).

4. The wheel hub assembly of any one of claims 1-3, wherein, In the retracted state, a portion of the drive member (400) below half of the length of the drive member (400) extends into the hub (100) through the drive through hole (130).

5. The wheel hub assembly of any one of claims 1-3, wherein, The hub (100) has a support frame (140) arranged on both sides of each drive through hole (130), and the drive member (400) is rotationally arranged on the support frame (140) through a pin shaft (150); The support frame (140) is arranged on an inner surface or an outer surface of the hub (100).

6. The wheel hub assembly of claim 5, wherein, The drive member (400) comprises a fixed component (410) and a movable component (420), the movable component (420) being capable of being extended or retracted by the fixed component (410), the movable component (420) being rotationally connected with the drive web (300), and the fixed component (410) being rotationally connected with the support frame (140).

7. The wheel hub assembly of any one of claims 1-3, wherein, The hub assembly further comprises: Two groups of mounting seats (310) are fixed on the driving web (300) respectively, each group of mounting seats (310) comprises at least two mounting seats (310), each mounting seat (310) is provided with a connecting shaft (320), one end of each driving member (400) is rotatably connected with one connecting shaft (320).

8. The wheel hub assembly of claim 7, wherein, The mounting seat (310) comprises an upper blocking rib (311), a lower blocking rib (312) and a connecting rib, the connecting rib is connected at one end of the upper blocking rib (311) and the lower blocking rib (312), so that the upper blocking rib (311) and the lower blocking rib (312) form a circumferentially extending gap, the middle part of the gap is towards the driving member (400); The connecting shaft (320) passes through the upper blocking rib (311) and the lower blocking rib (312), one end of the driving member (400) is sleeved on the connecting shaft (320) and located between the upper blocking rib (311) and the lower blocking rib (312).

9. The wheel hub assembly of any one of claims 1-3, wherein, The driving member (400) is a hydraulic cylinder or an electric push rod or a worm gear structure; and / or The main body part of the hub (100) is in a bent pipe shape, and the two vane connecting ports (110) are located at two ends of the bent pipe shape.

10. A wind power unit, characterized in that A hub assembly comprising a hub assembly as claimed in any one of claims 1 to 9. A hub assembly comprising a hub assembly as claimed in any one of claims 1 to 9.

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