Base and wind turbine generator set

Abstract

The application relates to a base and a wind turbine generator set, the base comprising: a base body comprising a first flange, a second flange and a connecting body connecting the first flange and the second flange, the connecting body being internally provided with a containing cavity, and the axis of the first flange being arranged to intersect the axis of the second flange; and a reinforcing assembly arranged in the containing cavity and connected with the connecting body, the reinforcing assembly comprising a ring-shaped reinforcing beam and a back beam assembly, the ring-shaped reinforcing beam being arranged to be spaced apart from and opposite to the first flange, and the back beam assembly being connected with the ring-shaped reinforcing beam and extending from the ring-shaped reinforcing beam to the side where the second flange is located. The base and the wind turbine generator set provided by the embodiment of the application can meet the bearing requirement, and meanwhile, the base is light in weight and low in cost.

Description

Technical Field

[0001] This invention relates to the field of wind power technology, and in particular to a base and a wind turbine generator set. Background Technology

[0002] To meet the challenges and market demands, wind turbine manufacturers need to adopt new structural design methods to reduce turbine costs during the development of new models.

[0003] Among the components of the overall cost of a wind turbine generator set, the casting cost of its shaft system is a significant portion. The shaft system of a direct-drive wind turbine generator set mainly consists of the hub, drive shaft, fixed shaft, and base. As a crucial load-bearing structure of the wind turbine generator set's shaft system, the base transfers the aerodynamic loads from the rotor to the tower system and provides support for the yaw system and the entire nacelle. Therefore, for the entire wind turbine generator set, the base bears the most complex loads and is one of the most difficult components to design.

[0004] To ensure its load-bearing capacity, the base of existing wind turbine generators is designed with a solid, thick shell with a complex curved shape between the fixed axis connecting flange and the yaw bearing connecting flange. Although this can meet the load-bearing requirements, it also has the disadvantages of being heavy and costly. Summary of the Invention

[0005] This invention provides a base and a wind turbine generator set. The base can meet the load-bearing requirements, and at the same time, the base is lightweight and inexpensive.

[0006] On one hand, according to an embodiment of the present invention, a base is provided, comprising: a base body, including a first flange, a second flange, and a connecting body connecting the first flange and the second flange, the connecting body having a receiving cavity inside, the axis of the first flange and the axis of the second flange being intersected; and a reinforcing assembly disposed in the receiving cavity and connected to the connecting body, the reinforcing assembly including a circumferential reinforcing beam and a back beam assembly, the circumferential reinforcing beam being spaced apart from and opposite to the first flange, the back beam assembly being connected to the circumferential reinforcing beam and extending from the circumferential reinforcing beam toward the side where the second flange is located.

[0007] According to one aspect of the present invention, the maximum distance between the first flange and the circumferential reinforcing beam is D, wherein 350mm≤D≤400mm.

[0008] According to one aspect of the present invention, a first flange extends along a first trajectory, and a circumferential reinforcing beam extends along a second trajectory. Both the first trajectory and the second trajectory are arranged around the axis of the first flange, and the plane containing the first trajectory is parallel to the plane containing the second trajectory.

[0009] According to one aspect of the present invention, the back beam assembly is an integral mesh structure and is disposed between the circumferential reinforcing beam and the second flange.

[0010] According to one aspect of the present invention, the back beam assembly has a grid of holes spaced apart, and the connecting body is provided with a perforated hole that is disposed opposite to the grid holes and communicates with the receiving cavity.

[0011] According to one aspect of the present invention, the back beam assembly includes a first back beam and a second back beam, one end of the first back beam being connected to a circumferential reinforcing beam and the other end extending toward a second flange, the second back beam being intersected with the first back beam, one end of the second back beam being connected to the circumferential reinforcing beam and the other end extending toward the second flange.

[0012] According to one aspect of the present invention, the back beam assemblies are arranged in pairs and are symmetrically distributed within the connecting body. The second back beam of the paired back beam assemblies is located on the side closer to each other, and the first back beam is located on the side farther away from each other.

[0013] According to one aspect of the present invention, the reinforcing assembly further includes a transition beam, one end of which is connected to the circumferential reinforcing beam, and the other end of which extends away from the circumferential reinforcing beam. The second divergence of each of the paired back beam assemblies converges at the end of the transition beam away from the circumferential reinforcing beam and is indirectly connected to the circumferential reinforcing beam through the transition beam.

[0014] According to one aspect of the present invention, in the axial direction of the second flange, the orthographic projection shape of the base is an axisymmetric structure, and the transition beam covers the axis of symmetry of the orthographic projection.

[0015] According to one aspect of the present invention, the reinforcing assembly further includes a reinforcing beam disposed on the side of the first back beam away from the second back beam, one end of the reinforcing beam being connected to the circumferential reinforcing beam and the other end extending toward the second flange.

[0016] According to one aspect of the present invention, the starting end of at least one of the first back beam, the transition beam, and the reinforcing beam is arranged perpendicular to the circumferential reinforcing beam; and / or, from the side where the first flange is located to the side where the second flange is located, the dimension of at least one of the first back beam, the transition beam, and the reinforcing beam protruding from the inner surface of the connecting body near the second flange gradually decreases.

[0017] According to one aspect of the present invention, the connecting body is provided with an opening communicating with the receiving cavity, and the reinforcing component further includes a hole wall reinforcing beam, the hole wall reinforcing beam being annular in shape and arranged around the opening.

[0018] According to one aspect of the present invention, the connecting body includes a first main body segment and a second main body segment disposed sequentially, the wall thickness of the first main body segment being greater than the wall thickness of the second main body segment, the first main body segment being connected to a first flange and a circumferential reinforcing beam, and the second main body segment being connected to and covering the circumferential reinforcing beam, the back beam assembly, and the second flange.

[0019] According to one aspect of the present invention, the wall thickness of the first main body segment is 3 to 6 times the wall thickness of the second main body segment.

[0020] According to one aspect of the present invention, the angle between the axis of the first flange and the horizontal plane is 5° to 8°; and / or, the base further includes a yaw bracket disposed on the outer wall surface of the second flange, the yaw bracket being provided with two or more spaced mounting holes; and / or, the connecting body is provided with a cable hole, the cable hole penetrating through the side wall of the connecting body and communicating with the receiving cavity.

[0021] In another aspect, according to an embodiment of the present invention, a wind turbine generator set is provided, comprising: a tower; a yaw bearing disposed on the tower, wherein one of the inner ring and the outer ring of the yaw bearing is connected to the tower; the aforementioned base, wherein the base is connected to the other of the inner ring and the outer ring via a second flange; and a fixed shaft connected to a first flange.

[0022] According to embodiments of the present invention, the base and wind turbine generator set include a base body and a reinforcing assembly. When used in a wind turbine generator set, the first flange of the base body can be connected to the fixed shaft, and the second flange can be connected to the yaw bearing. Since the connecting body connects the first flange and the second flange, the aerodynamic load of the wind turbine generator set rotor can be transmitted to the tower system through the fixed shaft, the first flange, the connecting body, the second flange, and the yaw bearing. The reinforcing assembly provided in the receiving cavity of the connecting body has a circumferential reinforcing beam that enhances the strength of the connection side between the connecting body and the first flange and reduces the deformation of the first flange side. The back beam assembly can transfer the load borne by the first flange to the side where the second flange is located through the back beam assembly, optimizing the load transfer path and transferring the load borne by the base to the reinforcing assembly, thereby reducing the thickness of the connecting body, achieving optimized material distribution, minimizing the weight of the base, making it lightweight and cost-effective. Attached Figure Description

[0023] The features, advantages and technical effects of exemplary embodiments of the present invention will now be described with reference to the accompanying drawings.

[0024] Figure 1 This is a simplified structural diagram of a wind turbine generator set according to an embodiment of the present invention;

[0025] Figure 2 This is a partial structural schematic diagram of a wind turbine generator set according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the base structure according to an embodiment of the present invention;

[0027] Figure 4 This is a front view of the base according to an embodiment of the present invention;

[0028] Figure 5 This is a partial structural diagram of the base from one perspective according to an embodiment of the present invention;

[0029] Figure 6 This is a partial structural diagram of the base of one embodiment of the present invention from another perspective;

[0030] Figure 7 This is a bottom view of the base according to an embodiment of the present invention.

[0031] in:

[0032] 1-Base;

[0033] 10-Base body; 11-First flange; 111-First flange hole; 12-Second flange; 121-Second flange hole; 122-Groove; 13-Connecting body; 131-First main body section; 132-Second main body section; 13a-Receiving cavity; 13b-Opening; 13c-Cable hole; 13d-Perforated hole;

[0034] 20-Reinforcing component; 21-Circumferential reinforcing beam; 22-Back beam assembly; 221-First back beam; 222-Second back beam; 22a-Grid hole; 23-Transition beam; 24-Reinforcing beam; 25-Hole wall reinforcing beam;

[0035] 30 - Yaw bracket; 31 - Mounting hole;

[0036] 100-Nacelle; 200-Tower; 300-Generator; 400-Impeller; 410-Hub; 420-Blade; 510-Stabilized Shaft; 600-Caliper; 700-Yaw Motor.

[0037] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale. Detailed Implementation

[0038] The features and exemplary embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description in order to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. In the accompanying drawings and the following description, at least some well-known structures and techniques have not been shown in order to avoid unnecessarily obscuring the invention; and, for clarity, the dimensions of some structures may be exaggerated. Furthermore, the features, structures, or characteristics described below may be combined in any suitable manner in one or more embodiments.

[0039] 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 base and wind turbine generator set of the present invention. In the description of the present invention, it should also be noted 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 the present invention according to the specific circumstances.

[0040] To better understand this invention, the following is combined with... Figures 1 to 7 The present invention provides a detailed description of a base and a wind turbine generator set according to embodiments thereof.

[0041] like Figure 1 as well as Figure 2 As shown, the wind turbine generator set provided in this embodiment of the invention includes a tower 200, a nacelle 100, a generator 300, a shaft system, and a rotor 400. The tower 200 is connected to the wind turbine foundation, and the nacelle 100 is disposed at the top of the tower 200. The nacelle 100 includes a base 1, and the nacelle 100 can be connected to the tower 200 and the shaft system through the base 1. The generator 300 is disposed in the nacelle 100. In some examples, the generator 300 may be located outside the nacelle 100; of course, in some examples, the generator 300 may also be located inside the nacelle 100.

[0042] The impeller 400 includes a hub 410 and multiple blades 420 connected to the hub 410. The shaft system includes a rotating shaft (not shown) and a fixed shaft 510, which are connected to the base 1. The rotating shaft is connected to the impeller 400, specifically to the hub 410 of the impeller 400. The generator 300 includes a rotating rotor and a stator, which are connected to the rotating shaft and the stator is connected to the fixed shaft and / or the base 1. When wind power acts on the blades 420, the blades 420 drive the hub 410 to rotate. Since the rotating shaft of the shaft system is connected to the hub 410, the rotating shaft can rotate relative to the fixed shaft 510, thereby driving the rotor to rotate relative to the stator, thus meeting the power generation requirements of the wind turbine generator set.

[0043] To meet the yaw requirements of the wind turbine generator set, it also includes a yaw bearing. The base 1 is connected to the tower 200 via the yaw bearing, enabling the base 1 to drive the generator 300, rotor 400, and other components to rotate relative to the tower 200. As an important load-bearing structure of the wind turbine generator set's shaft system, the base 1 transfers the aerodynamic load from the rotor 400 to the tower 200 and provides support for the yaw bearing and the entire nacelle 100.

[0044] To ensure its load-bearing capacity, existing bases use a solid, thick shell with a complex curved surface between the fixed-axis connecting flange and the yaw bearing connecting flange. This design method does not fully consider factors such as structural optimization and optimal material distribution. The resulting base design suffers from drawbacks such as heavy weight, low material utilization, and high cost.

[0045] To address the aforementioned shortcomings, this invention provides a novel base 1 that meets load-bearing requirements. Furthermore, this base 1 offers advantages such as light weight, high material utilization, and low cost. To better understand this invention, the following will be combined with… Figures 3 to 7 The base 1 provided in the embodiment of the present invention will be described in detail.

[0046] like Figures 3 to 5 As shown, the base 1 provided in this embodiment of the invention includes a base body 10 and a reinforcing assembly 20. The base body 10 includes a first flange 11, a second flange 12, and a connecting body 13 connecting the first flange 11 and the second flange 12. The connecting body 13 has a receiving cavity 13a inside, and the axis AA of the first flange 11 intersects the axis BB of the second flange 12. The reinforcing assembly 20 is disposed in the receiving cavity 13a and connected to the connecting body 13. The reinforcing assembly 20 includes a circumferential reinforcing beam 21 and a back beam assembly 22. The circumferential reinforcing beam 21 is spaced apart from and opposite to the first flange 11. The back beam assembly 22 is connected to the circumferential reinforcing beam 21 and extends from the circumferential reinforcing beam 21 toward the side where the second flange 12 is located.

[0047] The base 1 provided in this embodiment of the invention, when used in a wind turbine generator set, allows the first flange 11 of the base body 10 to be connected to the fixed shaft 510, and the second flange 12 to be connected to the yaw bearing. Since the connecting body 13 connects the first flange 11 and the second flange 12, the aerodynamic load of the wind turbine generator set impeller 400 can be transmitted to the tower 200 through the fixed shaft 510, the first flange 11, the connecting body 13, the second flange 12, and the yaw bearing. The reinforcing component 20 provided in the receiving cavity 13a of the connecting body 13, with its circumferential reinforcing beam 21, can enhance the strength of the connection side between the connecting body 13 and the first flange 11, reducing the deformation of the base 1 on the first flange 11 side. The back beam assembly 22 can transfer the load borne by the first flange 11 to the side where the second flange 12 is located through the back beam assembly 22, optimize the load transfer path, transfer the load borne by the base 1 to the reinforcing assembly 20, and use the reinforcing assembly 20 as the main load-bearing structure to reduce the thickness of the connecting body 13, thereby achieving optimized material distribution and minimizing the weight of the base 1, making it lightweight and inexpensive.

[0048] Furthermore, the aforementioned structural form of the base 1 is inheritable, meaning it can be templated and standardized. Once the template of the base 1 is precise, for different wind turbine models, only parameters such as the dimensions of the first flange 11 and the second flange 12 of the base 1 need to be changed to complete the design of the base 1 for different models. This design method greatly reduces the design and development cost of the base 1 and facilitates the rapid development of wind turbine products.

[0049] In some alternative embodiments, the base 1 can be formed by casting, and its base body 10 and reinforcing component 20 can be an integral structure, which is conducive to the forming of the base 1, and at the same time can ensure the connection strength between the reinforcing component 20 and the base body 10 and between the various components of the base body 10.

[0050] As an optional implementation, the first flange 11 can be an annular flange, and the first flange 11 can be provided with a plurality of first flange holes 111. The plurality of first flange holes 111 are divided into two groups. The plurality of first flange holes 111 in one group are distributed at intervals along the first pitch circle, and the plurality of first flange holes 111 in the other group are distributed at intervals along the second pitch circle.

[0051] Optionally, the second flange 12 can be an annular flange, and the second flange 12 is provided with multiple second flange holes 121, which can be distributed at intervals along the same pitch circle. The angle of intersection between the axis AA of the first flange 11 and the axis BB of the second flange 12 can be set according to the angle between the axis of the fixed shaft 510 and the axis of the tower 200, as long as it can meet the connection and load transfer requirements between the two. In some optional embodiments, the axis AA of the first flange 11 can form an angle α with the horizontal plane, and the value of the angle α can be in the range of 5° to 8°. The axis BB of the second flange 12 can be perpendicular to the horizontal plane to effectively ensure the connection and load transfer requirements. It can also ensure that the minimum distance between the blade 420 and the tower 200 is kept within a reasonable range during the operation of the wind turbine generator.

[0052] Optionally, the internal opening of the second flange 12 can be circular, which can significantly improve stress concentration around the opening on the flange face. If strength requirements are met, the opening can also be rectangular with rounded corners.

[0053] Optionally, the connecting body 13 can be an irregular cylindrical or tubular structure. One end of the connecting body 13 is connected to the first flange 11, and the other end of the connecting body 13 is connected to the second flange 12. The internal cavity of the connecting body 13 forms a receiving cavity 13a to accommodate other components such as the reinforcing component 20.

[0054] As an optional implementation, in the base 1 provided by this embodiment of the invention, the maximum distance between the first flange 11 and the circumferential reinforcing beam 21 is D, where D can be any value between 350mm and 400mm, including both 350mm and 400mm. Using the above-mentioned numerical range between the first flange 11 and the circumferential reinforcing beam ensures the strength reinforcement of the first flange 11, making the base 1 strong enough on the side where the first flange 11 is located to bear the load transmitted by the fixed shaft 510, thereby improving the safety performance of the base 1.

[0055] In some optional embodiments, the distance D between the first flange 11 and the circumferential reinforcing beam 21 can be any value between 380mm and 400mm. After mechanical analysis, adopting the above-mentioned value range can better ensure the connection between the circumferential reinforcing beam 21 and the back beam assembly 22 and optimize the load transfer path between the circumferential reinforcing beam 21 and the back beam assembly 22. Optionally, the distance D refers to the maximum vertical distance between the first flange 11 and the circumferential reinforcing beam 21.

[0056] In one optional implementation, the first flange 11 extends along a first trajectory MM, and the circumferential reinforcing beam 21 extends along a second trajectory NN. Both the first trajectory MM and the second trajectory NN are arranged around the axis AA of the first flange 11, and the plane containing the first trajectory MM is parallel to the plane containing the second trajectory NN. For example, when the first flange 11 is an annular flange, the extension trajectory of the first flange 11 is circular. When the circumferential reinforcing beam 21 is a curved beam arranged around the axis AA of the first flange 11, the second trajectory NN is a curved trajectory arranged around the axis AA of the first flange 11. By making the plane containing the first trajectory MM and the plane containing the second trajectory NN parallel to each other, the load borne by the first flange 11 can be directly transferred to the circumferential reinforcing beam 21 through the connecting body 13 located between the two, and then transferred to the second flange 12 through the back beam assembly 22, and finally to the tower 200 body.

[0057] Optionally, the circumferential reinforcing beam 21 can be a closed loop arranged around the axis AA of the first flange 11. Of course, in some embodiments, the circumferential reinforcing beam 21 can also be a curved beam arranged around the axis AA of the first flange 11, that is, there can be a gap between the starting end and the ending end of the circumferential reinforcing beam 21. Specifically, it can be set according to the strength requirements of the base 1 and the structural form of the back beam assembly 22.

[0058] In some alternative embodiments, the intersection of the circumferential reinforcing beam 21 and the connecting body 13 is smoothly transitioned. Optionally, the intersection of the circumferential reinforcing beam 21 and the connecting body 13 is rounded. Optionally, when the circumferential reinforcing beam 21 adopts a curved beam structure, the cross-section of its starting and ending ends gradually decreases on the side away from the portion of the circumferential reinforcing beam 21 located between the two ends to prevent stress concentration.

[0059] As an optional implementation, the base 1 provided in this embodiment of the invention has a back beam assembly 22 that is an overall mesh structure and is disposed between the circumferential reinforcing beam 21 and the second flange 12. The mesh structure of the back beam assembly 22 allows the load on the circumferential reinforcing beam 21 to be distributed and transferred to the side where the second flange 12 is located through the mesh structure of the back beam assembly 22. This results in relatively uniform stress distribution across the second flange 12, facilitating the transfer of the main loads through the back beam assembly 22. Furthermore, the mesh structure exhibits high strength and good structural stability.

[0060] like Figure 5 as well as Figure 6As shown, in some optional embodiments, the back beam assembly 22 has spaced grid holes 22a, and the connecting body 13 is provided with perforated holes 13d that are opposite to the grid holes 22a and communicate with the receiving cavity 13a. This arrangement further reduces the weight of the base 1, achieving the lightweight requirement of the base 1, and also reduces the amount of material used in the base 1, lowering costs. Optionally, a flange structure can be provided on the connecting body 13 at the location enclosing the perforated holes 13d to strengthen the area where the perforated holes 13d are located.

[0061] In some optional embodiments, the back beam assembly 22 may include a first back beam 221 and a second back beam 222. One end of the first back beam 221 is connected to the circumferential reinforcing beam 21 and the other end extends toward the second flange 12. The second back beam 222 intersects with the first back beam 221, with one end connected to the circumferential reinforcing beam 21 and the other end extending toward the second flange 12. The back beam assembly 22 adopts a structure including the intersecting first back beam 221 and the second back beam 222, with one end of each beam directly or indirectly connected to the circumferential reinforcing beam 21 and the other end extending toward the side where the second flange 12 is located. This allows the loads at different positions on the circumferential reinforcing beam 21 to be transferred to the second flange 12 through the corresponding first back beam 221 and second back beam 222, better fulfilling the functional requirement that the load is mainly transferred to the side where the second flange 12 is located through the back beam assembly 22.

[0062] Optionally, the first back beam 221 intersects with the circumferential reinforcing beam 21. Optionally, the starting end of the first back beam 221 can be perpendicular to the circumferential reinforcing beam 21, and the other end can be bent and extended along the direction of the connecting body 13 towards the side where the second flange 12 is located, which facilitates load transfer. Optionally, the end of the first back beam 221 near the second flange 12 can be spaced apart from the second flange 12 to avoid stress concentration. Optionally, the end of the first back beam 221 extending towards the side where the second flange 12 is located can be smoothly transitioned with a variable cross-section to avoid stress concentration.

[0063] In some alternative embodiments, the starting end of the second back beam 222 can be directly connected to the circumferential reinforcing beam 21. Alternatively, in some embodiments, the second back beam 222 can be indirectly connected to the circumferential reinforcing beam 21. A gap can be formed between the end of the second back beam 222 near the second flange 12 and the second flange 12 to avoid stress concentration. Optionally, the end of the second back beam 222 extending towards the side where the second flange 12 is located can have a smooth transition using a variable cross-section to avoid stress concentration.

[0064] In some optional embodiments, the reinforcing component 20 may further include a transition beam 23, one end of which is connected to the circumferential reinforcing beam 21, and the other end of which extends away from the circumferential reinforcing beam 21. The second back beam 222 can be indirectly connected to the circumferential reinforcing beam 21 through the transition beam 23, thereby optimizing the load transfer path. Optionally, the connection positions between the transition beam 23 and the circumferential reinforcing beam 21, as well as with the connecting body 13, are all smoothly transitioned, and an arc transition connection may be used to avoid stress concentration.

[0065] like Figures 5 to 7 As shown, in an optional implementation, the orthographic projection shape of the base 1 in the axial direction of the second flange 12 is an axisymmetric structure, and the transition beam 23 covers the axis of symmetry PP of the orthographic projection. This arrangement facilitates load transfer and ensures the connection between the second back beam 222 and the circumferential reinforcing beam 21.

[0066] In some optional embodiments, the base 1 provided by this invention has a pair of back beam assemblies 22 arranged symmetrically within the connecting body 13. The second back beam 222 of the pair of back beam assemblies 22 is located on the side closer to each other, and the first back beam 221 is located on the side farther from each other. The paired and symmetrical arrangement of the back beam assemblies 22 ensures uniform strength throughout the base 1, improving its load-bearing capacity. In some optional embodiments, the orthographic projection of the pair of back beam assemblies 22 onto the second flange 12 is symmetrically distributed with respect to the aforementioned axis of symmetry PP.

[0067] As an optional implementation, the paired back beam assemblies 22 each converge at the end of the same transition beam 23 away from the circumferential reinforcing beam 21, and are both indirectly connected to the circumferential reinforcing beam 21 through the transition beam 23. This facilitates the formation of the mesh structure of the back beam assembly 22, improving the overall strength and load-bearing capacity of the base 1.

[0068] In some alternative embodiments, the extension length of the transition beam 23 is less than or equal to 90 mm, which facilitates the synchronous transfer of loads to the paired back beam assemblies 22.

[0069] Continue reading Figures 5 to 7As an optional implementation, the base 1 provided in this embodiment of the invention further includes a reinforcing beam 24. The reinforcing beam 24 is disposed on the side of the first back beam 221 away from the second back beam 222. One end of the reinforcing beam 24 is connected to the circumferential reinforcing beam 21, and the other end extends toward the second flange 12. By providing the reinforcing beam 24, other areas not covered by the back beam assembly 22 can be reinforced. Since one end of the reinforcing beam 24 is connected to the circumferential reinforcing beam 21 and the other end extends toward the side where the second flange 12 is located, the load at the corresponding position of the circumferential reinforcing beam 21 can be transferred to the second flange 12 through the reinforcing beam 24, thus optimizing the load transfer requirements of the base 1 through the reinforcing assembly 20.

[0070] Optionally, the starting end of the reinforcing beam 24 can be perpendicular to the circumferential reinforcing beam 21, and the other end can be bent and extended along the direction of the connecting body 13 towards the side where the second flange 12 is located, which facilitates load transfer. Optionally, the end of the reinforcing beam 24 near the second flange 12 can be spaced apart from the second flange 12 to avoid stress concentration. Optionally, the end of the reinforcing beam 24 extending towards the side where the second flange 12 is located can be smoothly transitioned with a variable cross-section to avoid stress concentration.

[0071] In some alternative embodiments, the reinforcing beams 24 may also be arranged in pairs, with the pairs of reinforcing beams 24 symmetrically arranged on both sides of the back beam assembly 22. In some alternative embodiments, the pairs of reinforcing beams 24 may be symmetrically distributed with respect to the axis of symmetry PP.

[0072] like Figures 2 to 7 As shown, in an optional embodiment, the base 1 provided in this invention has an opening 13b on its connecting body 13 that communicates with the receiving cavity 13a. The reinforcing component 20 further includes a hole wall reinforcing beam 25, which is generally annular and surrounds the opening 13b. The opening 13b facilitates the entry and exit of operators and equipment, while the correspondingly provided hole wall reinforcing beam 25 can improve the rigidity of the sidewall forming the opening 13b. In some optional embodiments, to ensure sufficient rigidity at the opening 13b, the cross-sectional area of ​​the hole wall reinforcing beam 25 along its extension trajectory is greater than or equal to 180 mm².

[0073] In some alternative embodiments, the shape of the hole wall reinforcing beam 25 may match the shape of the opening 13b. Exemplarily, the shape of the hole wall may be elliptical or polygonal, etc.

[0074] As an alternative implementation, the paired back beam assemblies 22 are symmetrically distributed on both sides of the opening 13b, and the second back beam 222 of the paired back beam assemblies 22 extends along the shape of the opening 13b to facilitate load transfer.

[0075] like Figures 2 to 7 As shown, in an optional implementation, the base 1 provided in this embodiment of the invention includes a connecting body 13 comprising a first main body segment 131 and a second main body segment 132 arranged sequentially. The wall thickness of the first main body segment 131 is greater than the wall thickness of the second main body segment 132. The first main body segment 131 is connected to the first flange 11 and the circumferential reinforcing beam 21, and the second main body segment 132 is connected to and covers the circumferential reinforcing beam 21, the back beam assembly 22, and the second flange 12. By adopting a segmented and unequal thickness design for the connecting body 13, the weight and cost of the base 1 can be further reduced while meeting the load transfer requirements.

[0076] Optionally, when the connecting body is provided with a hollow hole 11d, the hollow hole 11d is located on the second main body segment 132.

[0077] As an optional implementation, the wall thickness of the first main body segment 131 is any multiple between 3 and 6 times the wall thickness of the second main body segment 132, including two extreme values ​​of 3 times and 6 times. Through mechanical analysis, the above multiple relationship is set on the basis of ensuring the load bearing capacity of the base 1, which facilitates the molding of the base 1.

[0078] Optionally, when the plurality of first flange holes 111 included in the first flange 11 are divided into two groups and distributed at intervals on the first pitch circle and the second pitch circle respectively, the outer diameter of the first main body section 131 can be selected as the average value of the radial dimensions of the first pitch circle and the second pitch circle. In some optional embodiments, the wall thickness of the first main body section 131 can be any value between 70mm and 80mm, including both 70mm and 80mm. Optionally, the wall thickness of the second main body section 132 can be any value between 20mm and 40mm, including both 20mm and 40mm.

[0079] like Figures 2 to 7 As shown, in an optional embodiment, the base 1 provided in this invention further includes a yaw bracket 30, which is disposed on the outer wall of the second flange 12. The yaw bracket 30 has two or more spaced mounting holes 31. The yaw bracket 30 can adopt a single-layer lightweight design, and the design thickness is determined according to the strength verification results. The mounting holes 31 are used to install the yaw motor 700, and the mounting holes 31 are evenly distributed around the base 1. The mounting holes 31 adopt a stepped design, and the step thickness is determined according to the selection of the yaw motor 700. A certain number of bolt holes are provided on the mounting holes 31 for detachable connection with the yaw motor 700.

[0080] Optionally, the base 1 provided in this embodiment of the invention has a cable hole 13c on its connecting body 13. The cable hole 13c penetrates the side wall of the connecting body 13 and communicates with the receiving cavity 13a. The cable hole 13c facilitates the routing of cables connected to components such as the yaw motor 700.

[0081] As an optional implementation, the second flange 12 is also provided with a groove 122 and bolt holes. The groove 122 is used to install the yaw brake pad, and the bolt holes are used to connect the caliper 600. There are multiple grooves 122, and they can be non-uniformly distributed in the circumference of the second flange 12. The size of their pitch circle diameter depends on the selection of the yaw sliding bearing. In addition, the groove 122 can be optionally 4mm to 7mm deep, and more preferably 5mm. The two radial edge extensions of the groove 122 intersect at the center of the groove pitch circle, and the two right-angled edges of each groove 122 are chamfered to avoid stress concentration.

[0082] The base 1 provided in this embodiment of the invention has an internal reinforcing component 20 that serves as the main load transfer component, thereby reducing the thickness of the connecting body 13 and achieving optimized material distribution. This minimizes the weight of the base 1, making it lightweight and cost-effective. The wind turbine generator set provided in this embodiment of the invention, by including the base 1 provided in the above embodiments, can meet the connection and load transfer requirements between the fixed shaft and the tower 200, while also offering higher safety performance and better power generation efficiency.

[0083] Although the invention has been described with reference to preferred embodiments, various modifications can be made 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 as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A base (1) for a wind turbine generator set, the wind turbine generator set including a tower and a shaft system, the base being used to connect the tower and the shaft system, characterized in that, The base includes: The base body (10) includes a first flange (11), a second flange (12) and a connecting body (13) connecting the first flange (11) and the second flange (12). The connecting body (13) has a receiving cavity (13a) inside. The axis (AA) of the first flange (11) and the axis (BB) of the second flange (12) are intersected. A reinforcing assembly (20) is disposed in the receiving cavity (13a) and connected to the connecting body (13). The reinforcing assembly (20) includes a circumferential reinforcing beam (21) and a back beam assembly (22). The circumferential reinforcing beam (21) is spaced apart from and opposite to the first flange (11). The back beam assembly (22) is connected to the circumferential reinforcing beam (21) and extends from the circumferential reinforcing beam (21) toward the side where the second flange (12) is located.

2. The base (1) according to claim 1, characterized in that, The maximum distance between the end faces of the first flange (11) and the circumferential reinforcing beam (21) facing each other is D, where 350mm≤D≤400mm.

3. The base (1) according to claim 1, characterized in that, The first flange (11) extends along a first trajectory, and the circumferential reinforcing beam (21) extends along a second trajectory. Both the first trajectory and the second trajectory are arranged around the axis (AA) of the first flange (11), and the plane of the first trajectory is parallel to the plane of the second trajectory.

4. The base (1) according to claim 1, characterized in that, The back beam assembly (22) is an overall mesh structure and is disposed between the circumferential reinforcing beam (21) and the second flange (12).

5. The base (1) according to claim 4, characterized in that, The back beam assembly (22) has spaced grid holes (22a), and the connecting body (13) is provided with a hollow hole that is opposite to the grid holes (22a) and communicates with the receiving cavity (13a).

6. The base (1) according to claim 4, characterized in that, The back beam assembly (22) includes a first back beam (221) and a second back beam (222). One end of the first back beam (221) is connected to the circumferential reinforcing beam (21) and the other end extends toward the second flange (12). The second back beam (222) is intersecting with the first back beam (221). One end of the second back beam (222) is connected to the circumferential reinforcing beam (21) and the other end extends toward the second flange (12).

7. The base (1) according to claim 6, characterized in that, The back beam assemblies (22) are arranged in pairs and are symmetrically distributed within the connecting body (13). The second back beam (222) of the paired back beam assemblies (22) is located on the side closer to each other and the first back beam (221) is located on the side farther away from each other.

8. The base (1) according to claim 7, characterized in that, The reinforcing component (20) also includes a transition beam (23), one end of which is connected to the circumferential reinforcing beam (21), and the other end of which extends away from the circumferential reinforcing beam (21). The second back beams (222) of the paired back beam components (22) converge at the end of the transition beam (23) away from the circumferential reinforcing beam (21) and are indirectly connected to the circumferential reinforcing beam (21) through the transition beam (23).

9. The base (1) according to claim 8, characterized in that, In the axial direction of the second flange (12), the orthographic projection shape of the base (1) is an axisymmetric figure, and the transition beam (23) covers the axis of symmetry of the orthographic projection.

10. The base (1) according to claim 8, characterized in that, The reinforcing component (20) further includes a reinforcing beam (24), which is disposed on the side of the first back beam (221) away from the second back beam (222). One end of the reinforcing beam (24) is connected to the circumferential reinforcing beam (21), and the other end extends toward the second flange (12).

11. The base (1) according to claim 10, characterized in that, The starting end of at least one of the first back beam (221), the transition beam (23), and the reinforcing beam (24) is perpendicular to the circumferential reinforcing beam (21); And / or, from the side where the first flange (11) is located to the side where the second flange (12) is located, the dimension of at least one of the first back beam (221), the transition beam (23) and the reinforcing beam (24) protruding from the inner surface of the connecting body (13) near the second flange (12) gradually decreases.

12. The base (1) according to claim 1, characterized in that, The connecting body (13) is provided with an opening (13b) communicating with the receiving cavity (13a), and the reinforcing component (20) further includes a hole wall reinforcing beam (25), which is generally annular and arranged around the opening (13b).

13. The base (1) according to claim 1, characterized in that, The connecting body (13) includes a first main body segment (131) and a second main body segment (132) arranged successively. The wall thickness of the first main body segment (131) is greater than the wall thickness of the second main body segment (132). The first main body segment (131) is connected to the first flange (11) and the circumferential reinforcing beam (21). The second main body segment (132) is connected to and covers the circumferential reinforcing beam (21), the back beam assembly (22), and the second flange (12).

14. The base (1) according to claim 13, characterized in that, The wall thickness of the first main body segment (131) is 3 to 6 times the wall thickness of the second main body segment (132).

15. The base (1) according to claim 1, characterized in that, The angle (α) between the axis (AA) of the first flange (11) and the horizontal plane is 5° to 8°. And / or, the base (1) further includes a yaw bracket (30), the yaw bracket (30) is disposed on the outer wall surface of the second flange (12), and the yaw bracket (30) is provided with two or more spaced mounting holes (31); And / or, the connecting body (13) is provided with a cable hole (13c), the cable hole (13c) penetrates the side wall of the connecting body (13) and communicates with the receiving cavity (13a).

16. A wind turbine generator set, characterized in that, include: Tower; A yaw bearing is disposed on the tower, and one of the inner ring and the outer ring of the yaw bearing is connected to the tower; The base (1) as claimed in any one of claims 1 to 15, wherein the base (1) is connected to the other of the inner ring and the outer ring via the second flange (12); The fixed shaft is connected to the first flange (11).

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