Fan main shaft assembly and wind turbine generator set

Abstract

The application relates to the technical field of wind power, in particular to a fan main shaft assembly and a wind turbine. The fan main shaft assembly comprises a main shaft, a bearing seat, a hub, a first bearing unit, a planet carrier and a second bearing unit; the main shaft is a cylindrical hollow structure, and the main shaft is arranged in the bearing seat; the bearing inner ring of the first bearing unit is connected with the main shaft and the hub, and the bearing outer ring of the first bearing unit is connected with the bearing seat; the planet carrier is connected with one end of the main shaft away from the hub, and the planet carrier is rotatably connected with the bearing seat through the second bearing unit. The fan main shaft assembly is applied to the wind turbine, the main shaft adopts a cylindrical structure, and there is no thick horn mouth, so that stress can be uniformly distributed, thereby reducing casting defects and eliminating the risk of main shaft cracking.

Description

Technical Field

[0001] This invention relates to the field of wind power technology, and more specifically, to a wind turbine main shaft assembly and a wind turbine generator set. Background Technology

[0002] Currently, the main shaft system of a wind turbine generator set mainly consists of components such as bearing housings, main shaft, front main bearing, and rear main bearing. The main shaft is integrally cast and has a trumpet-shaped shape, with an integrated locking disc at the hub connection end. However, due to the large trumpet-shaped and thick structure at the front end of the main shaft, which is a high-stress area, defects such as shrinkage cavities, porosity, and cracks are prone to occur during the casting process, posing a risk of cracking during unit operation. Summary of the Invention

[0003] The present invention aims to provide a wind turbine main shaft assembly and a wind turbine generator set, wherein the main shaft adopts a cylindrical structure without a thick flared opening, thereby enabling the stress to be evenly distributed, thereby reducing casting defects and eliminating the risk of main shaft cracking.

[0004] The embodiments of the present invention can be implemented as follows: In a first aspect, the present invention provides a wind turbine main shaft assembly, which includes a main shaft, a bearing housing, a hub, a first bearing unit, a planetary carrier, and a second bearing unit; The main shaft has a cylindrical hollow structure and is housed in a bearing housing; the inner ring of the first bearing unit is connected to the main shaft and the hub, and the outer ring of the first bearing unit is connected to the bearing housing; the planetary carrier is connected to the end of the main shaft away from the hub, and the planetary carrier is rotatably connected to the bearing housing through the second bearing unit.

[0005] In an optional embodiment, the fan spindle assembly further includes a locking element mounted on the bearing housing; At least one locking limit stage is provided on the outer periphery of the spindle. The locking limit stage is used to abut against the locking element to limit the relative rotation between the spindle and the bearing housing.

[0006] In an optional embodiment, the fan main shaft assembly includes two locking members, which are symmetrically arranged with respect to the axis of the main shaft; two locking limit platforms are provided on the outer periphery of the main shaft, which are symmetrically arranged with respect to the axis of the main shaft.

[0007] In an optional embodiment, the fan main shaft assembly includes two locking members, which are spaced apart along the axis of the main shaft; two locking limit platforms are provided on the outer periphery of the main shaft, which are spaced apart along the axis of the main shaft.

[0008] In an optional embodiment, the inner ring of the first bearing unit is provided with an inclined roller mounting surface, and the outer diameter of the roller mounting surface gradually increases from the hub to the main shaft. The inner ring of the bearing is L-shaped and is connected to the main shaft and hub by bolts.

[0009] In an optional implementation, the second bearing unit is thermally mounted on the planetary carrier.

[0010] In an alternative implementation, the planetary carrier is bolted to the spindle.

[0011] In an optional embodiment, the fan spindle assembly further includes a pressure plate disposed between the spindle and the planetary carrier.

[0012] In an optional implementation, the pressure plate, spindle, and planetary carrier share the same set of connecting bolts for fixation.

[0013] In a second aspect, the present invention provides a wind turbine generator set, which includes the aforementioned wind turbine main shaft assembly.

[0014] The beneficial effects of the wind turbine main shaft assembly and wind turbine generator set provided in the embodiments of the present invention include: The wind turbine main shaft assembly includes a main shaft, bearing housing, hub, first bearing unit, planetary carrier, and second bearing unit. The main shaft has a cylindrical hollow structure and is housed within the bearing housing. The inner ring of the first bearing unit is connected to the main shaft and hub, while the outer ring is connected to the bearing housing. The planetary carrier is connected to the end of the main shaft away from the hub, and is rotatably connected to the bearing housing via the second bearing unit. This wind turbine main shaft assembly is used in wind turbine generator sets. Its cylindrical main shaft structure, without a thick flared end, allows for uniform stress distribution, reducing casting defects and eliminating the risk of main shaft cracking. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a first-view cross-sectional view of the wind turbine main shaft assembly provided in this embodiment. Figure 2 This is a schematic diagram of the structure of the fan main shaft assembly provided in this embodiment; Figure 3 This is a cross-sectional view of the wind turbine main shaft assembly provided in this embodiment from a second perspective. Figure 4 for Figure 1 A partial schematic diagram of point A in the middle.

[0017] Icons: 100-Fan main shaft assembly; 110-Main shaft; 120-Bearing housing; 130-Hub; 140-First bearing unit; 150-Planetary carrier; 160-Second bearing unit; 141-Bearing inner ring; 142-Bearing outer ring; 143-Roller mounting surface; 170-Locking element; 111-Locking limit platform; 180-Pressure plate. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0022] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0023] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0024] Please refer to Figure 1 and Figure 2 This embodiment provides a fan main shaft assembly 100, which includes a main shaft 110, a bearing housing 120, a hub 130, a first bearing unit 140, a planetary carrier 150, and a second bearing unit 160. The main shaft 110 has a cylindrical hollow structure and is housed within the bearing housing 120. The inner bearing ring 141 of the first bearing unit 140 is connected to the main shaft 110 and the hub 130, and the outer bearing ring 142 of the first bearing unit 140 is connected to the bearing housing 120. The planetary carrier 150 is connected to the end of the main shaft 110 away from the hub 130, and the planetary carrier 150 is rotatably connected to the bearing housing 120 through the second bearing unit 160.

[0025] Please refer to Figure 1 and Figure 2 The working principle of the main shaft assembly 100 of the fan is as follows: The main shaft assembly 100 of the wind turbine includes a main shaft 110, a bearing housing 120, a hub 130, a first bearing unit 140, a planetary carrier 150, and a second bearing unit 160. The main shaft 110 has a cylindrical hollow structure and is disposed within the bearing housing 120. The inner bearing ring 141 of the first bearing unit 140 is connected to the main shaft 110 and the hub 130, and the outer bearing ring 142 of the first bearing unit 140 is connected to the bearing housing 120. The planetary carrier 150 is connected to the end of the main shaft 110 away from the hub 130, and the planetary carrier 150 is rotatably connected to the bearing housing 120 through the second bearing unit 160.

[0026] Therefore, compared to the existing technology where the spindle front end has a large flared opening and a thick structure, the large flared opening is a high-stress area, which easily leads to defects such as shrinkage cavities, porosity, and cracks during the casting process, posing a risk of cracking during unit operation. In contrast, the spindle 110 in this embodiment has a cylindrical hollow structure. By optimizing the spindle 110 and eliminating the large flared opening, the inner diameter of the spindle 110 at all positions is made more consistent, thereby allowing for a more uniform distribution of stress, which can reduce casting defects and eliminate the risk of cracking of the spindle 110.

[0027] It should also be noted that since the spindle 110 adopts a cylindrical hollow structure, this configuration reduces the size of the front end interface of the spindle 110. At the same time, the size and weight of the hub 130 are reduced, thereby reducing the overall load and lowering the cost.

[0028] Furthermore, in existing technologies, an integrated locking disc is used at the front end of the spindle, resulting in a larger spindle outer diameter and limiting transportation; using a separate locking disc would increase costs. Therefore, in this embodiment, please refer to... Figures 1-3The locking mechanism is achieved by setting a locking element 170. Specifically, the fan main shaft assembly 100 also includes a locking element 170, which is installed on the bearing housing 120. At least one locking limit platform 111 is provided on the outer periphery of the main shaft 110. The locking limit platform 111 is used to abut against the locking element 170 to limit the relative rotation between the main shaft 110 and the bearing housing 120.

[0029] Therefore, by setting the locking member 170, it can be installed on the bearing housing 120 and abut against the locking limit table 111 on the spindle 110, thereby restricting the relative rotation between the spindle 110 and the bearing housing 120. This allows the outer diameter of the spindle 110 to be reduced, making it easier to transport and lowering the cost, without the need for an additional split locking disc. Furthermore, in this embodiment, to improve the stability during the locking process and the stability of the main shaft 110 under stress, the fan main shaft assembly 100 includes two locking members 170. When setting two locking members 170, two locking limit platforms 111 need to be set on the main shaft 110, and the two locking limit platforms 111 correspond one-to-one with the two locking members 170. The two locking members 170 are symmetrically arranged with respect to the axis of the main shaft 110. In this embodiment, the central angle formed by the two locking members 170 with respect to the axis of the main shaft 110 is 60 degrees. In other embodiments, other angles can also be used, such as 30 degrees, 70 degrees, 90 degrees, or 180 degrees. Corresponding to the setting of the locking members 170, two locking limit platforms 111 are set on the outer periphery of the main shaft 110, and the two locking limit platforms 111 are symmetrically arranged with respect to the axis of the main shaft 110. This symmetrical arrangement ensures that the spindle 110 is subjected to uniform force during operation of the two locking elements 170, thereby improving the locking stability of the spindle 110.

[0030] In other embodiments of the present invention, when two locking members 170 are configured, two locking limiting platforms 111 are correspondingly provided on the main shaft 110, and the two locking limiting platforms 111 correspond one-to-one with the two locking members 170. Furthermore, the two locking members 170 can also be spaced apart along the axis of the main shaft 110. Two locking limiting platforms 111 are provided on the outer periphery of the main shaft 110, and the two locking limiting platforms 111 are spaced apart along the axis of the main shaft 110. This arrangement improves the stability of the locking and allows the locking members 170 to be located on the same side of the bearing housing 120 for ease of operation.

[0031] It should be noted that when configuring the locking component 170 and the locking limit stage 111, their installation position can be located on the side of the first bearing unit 140 close to the planetary carrier 150 and at the front end of the spindle 110, so as to facilitate installation and maintenance operations.

[0032] Furthermore, in the prior art, the front main bearing uses a thermal assembly, which makes it susceptible to bearing wear, overheating, or failure under long-term alternating loads. In this embodiment, please refer to... Figures 1-4 When configuring the first bearing unit 140, it is connected to the main shaft 110 using a non-thermal fitting installation method. Specifically, the inner bearing ring 141 of the first bearing unit 140 is L-shaped and is connected to the main shaft 110 and hub 130 by bolts, while its outer bearing ring 142 is installed in the bearing housing 120. This connection method simplifies the installation process, improves installation efficiency, and eliminates bearing race slippage, significantly improving reliability. Furthermore, the inner bearing ring 141 of the first bearing unit is equipped with an inclined roller mounting surface 143. The outer diameter of the roller mounting surface 143 gradually increases from the hub 130 to the main shaft 110. This arrangement can simultaneously withstand radial and axial loads, resist overturning moments, compensate for the load-bearing deflection and installation deviation of the main shaft 110, achieve self-alignment, balance roller loads, improve stress distribution, and enhance operational reliability.

[0033] When configuring the second bearing unit 160, please refer to... Figures 1-4 In this embodiment, the second bearing unit 160 is heat-shrinkably mounted on the planetary carrier 150, and the planetary carrier 150 is connected to the spindle 110 by bolts.

[0034] Furthermore, in existing technologies, when installing the pressure plate, it is often fastened with individual bolts, making it impossible to inspect and maintain after installation. Long-term vibration can easily cause it to loosen, leading to axial movement of the spindle system and affecting the reliability of the transmission chain. In this embodiment, please refer to... Figures 1-4 The fan main shaft assembly 100 also includes a pressure plate 180, which is disposed between the main shaft 110 and the planetary carrier 150. Furthermore, the pressure plate 180, the main shaft 110, and the planetary carrier 150 share the same set of connecting bolts for fixation. This design allows the bolts for mounting the pressure plate 180 to be exposed, facilitating regular inspection and maintenance, preventing the pressure plate 180 from loosening, and preventing axial movement of the main shaft 110 system.

[0035] In summary, please refer to Figures 1-4 The fan main shaft assembly 100 has at least the following advantages: The spindle 110 adopts a cylindrical structure without a thick flared opening, resulting in uniform stress distribution, fewer casting defects, and eliminating the risk of cracking. Furthermore, the reduced size of the front-end interface of the spindle 110 leads to a simultaneous reduction in the size and weight of the hub 130, resulting in a decrease in overall load and cost. The first bearing unit 140 uses bolts to directly connect the hub 130 and the spindle 110, eliminating the need for heat-shrink fittings and preventing bearing slippage, significantly improving reliability. The exposed bolts of the pressure plate 180 facilitate regular inspection and maintenance, preventing loosening of the pressure plate 180 and axial movement of the spindle 110 system. The spindle 110 lacks an integrated locking disc, resulting in a smaller outer diameter, easier transportation, and lower costs, eliminating the need for an additional separate locking disc. The locking component 170 is installed at the rear end of the first bearing unit 140, outside the bearing housing 120, making installation and maintenance more convenient.

[0036] Based on the above, please refer to Figures 1-4 This embodiment also provides a wind turbine generator set, which includes the aforementioned wind turbine main shaft assembly 100. This wind turbine generator set, by employing the aforementioned wind turbine main shaft assembly 100, possesses all the advantages of the aforementioned wind turbine main shaft assembly 100, which will not be elaborated further here.

[0037] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A fan main shaft assembly, characterized in that: The wind turbine main shaft assembly includes a main shaft, bearing housing, hub, first bearing unit, planetary carrier, and second bearing unit; The main shaft has a cylindrical hollow structure and is disposed inside the bearing housing; the inner ring of the first bearing unit is connected to the main shaft and the hub, and the outer ring of the first bearing unit is connected to the bearing housing; the planetary carrier is connected to the end of the main shaft away from the hub, and the planetary carrier is rotatably connected to the bearing housing through the second bearing unit.

2. The fan main shaft assembly according to claim 1, characterized in that: The fan main shaft assembly also includes a locking component, which is mounted on the bearing housing; At least one locking limit platform is provided on the outer periphery of the spindle. The locking limit platform is used to abut against the locking member to limit the relative rotation between the spindle and the bearing seat.

3. The fan main shaft assembly according to claim 2, characterized in that: The fan main shaft assembly includes two locking members, which are symmetrically arranged with respect to the axis of the main shaft; two locking limiting platforms are provided on the outer periphery of the main shaft, which are symmetrically arranged with respect to the axis of the main shaft.

4. The fan main shaft assembly according to claim 2, characterized in that: The fan main shaft assembly includes two locking members, which are spaced apart along the axis of the main shaft; two locking limit platforms are provided on the outer periphery of the main shaft, which are spaced apart along the axis of the main shaft.

5. The fan main shaft assembly according to any one of claims 1-4, characterized in that: The inner ring of the first bearing unit is provided with an inclined roller mounting surface, and the outer diameter of the roller mounting surface gradually increases from the hub to the main shaft; The inner ring of the bearing is L-shaped and is connected to the main shaft and the hub by bolts.

6. The fan main shaft assembly according to any one of claims 1-4, characterized in that: The second bearing unit heat-shrinkable sleeve is mounted on the planetary carrier.

7. The fan main shaft assembly according to any one of claims 1-4, characterized in that: The planetary carrier is connected to the spindle by bolts.

8. The fan main shaft assembly according to claim 7, characterized in that: The wind turbine main shaft assembly also includes a pressure plate, which is disposed between the main shaft and the planetary carrier.

9. The fan main shaft assembly according to claim 8, characterized in that: The pressure plate, the main shaft, and the planetary carrier are fixed together using the same set of connecting bolts.

10. A wind turbine generator set, characterized in that: The wind turbine generator set includes the wind turbine main shaft assembly as described in any one of claims 1-9.

Images