Main shaft device of wind generating set

Abstract

The utility model belongs to the technical field of wind power generation equipment, and relates to a main shaft device of a wind generating set, which comprises a front main shaft body, a middle main shaft body, a rear main shaft body, a front bearing outer ring, a rear bearing outer ring, a bearing seat, a front roller and a rear roller, the rear bearing outer ring is mounted at the other end of the bearing seat; the front roller is arranged in an annular space formed between the front bearing outer ring and the front main shaft body, and the rear roller is arranged in an annular space formed between the rear bearing outer ring and the rear main shaft body; the two ends of the middle spindle body are connected with the front spindle body and the rear spindle body respectively. The outer surfaces of the front main shaft body and the rear main shaft body are directly used as bearing raceways, and the bearing raceways, the corresponding front bearing outer ring, the corresponding rear bearing outer ring, the corresponding front roller and the corresponding rear roller form an inner-ring-free bearing system, so that the ring running phenomenon is avoided, and the stability of the main shaft in the running process is enhanced; and by splitting the main shaft, the overall size of the main shaft is reduced, and the manufacturing cost is reduced.

Description

Technical Field

[0001] This utility model relates to a main shaft device for a wind turbine generator set, belonging to the technical field of wind power generation equipment. Background Technology

[0002] Wind power generation, as an important form of renewable energy utilization, has developed rapidly in recent years. The main shaft, as the core component of a wind turbine generator, directly affects the overall operating efficiency, reliability, and maintenance costs of the entire wind turbine.

[0003] The main shaft assembly of a wind turbine not only needs to withstand the mechanical loads from the wind turbine, but also needs to maintain long-term stable operation in complex and variable natural environments (such as strong winds and extreme temperature changes). Traditionally, the main shaft and the inner ring of the bearing are connected by an interference fit, which prevents relative movement between them. However, in actual operation, due to the wind turbine's long-term exposure to dynamic loads and changes in ambient temperature, relative movement between the inner ring of the bearing and the main shaft is inevitable, a phenomenon commonly known in the industry as "shaking." Shaking not only leads to accelerated wear between the main shaft and the bearing, reducing transmission efficiency, but can also trigger a chain reaction of increased noise and vibration, and in severe cases, even affect the safe operation of the wind turbine, increasing maintenance costs and downtime. Utility Model Content

[0004] The purpose of this utility model is to provide a new technical solution to improve or solve the technical problems existing in the prior art as described above.

[0005] The technical solution provided by this utility model is as follows: A wind turbine generator main shaft device includes a front main shaft body, a middle main shaft body, a rear main shaft body, a front bearing outer ring, a rear bearing outer ring, a bearing housing, front rollers, and rear rollers. The bearing housing has an axially penetrating inner cavity. The front bearing outer ring is installed at one end of the bearing housing, and the rear bearing outer ring is installed at the other end of the bearing housing. The front bearing outer ring is sleeved on the front main shaft body, and a plurality of front rollers are arranged in an annular space formed between the front bearing outer ring and the front main shaft body. The rear bearing outer ring is sleeved on the rear main shaft body, and a plurality of rear rollers are arranged in an annular space formed between the rear bearing outer ring and the rear main shaft body. The two ends of the middle main shaft body are respectively connected to the front main shaft body and the rear main shaft body.

[0006] Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects: This utility model directly uses the outer surfaces of the front and rear main shaft bodies as bearing raceways, forming an inner-ring-less bearing system with the corresponding front and rear bearing outer rings, as well as the front and rear rollers. Compared with traditional bearing structures, this avoids the relative movement between the inner ring and the main shaft (i.e., the "running" phenomenon) in traditional structures, improving the bearing's load-bearing capacity and enhancing the stability of the wind turbine generator main shaft assembly during operation. By splitting the main shaft into a front, middle, and rear main shaft body, the overall size of the main shaft is reduced, avoiding the complex process of integral forging of a large main shaft, thereby reducing manufacturing costs. The segmented manufacturing method also reduces processing difficulty and improves production efficiency, enabling the wind turbine generator main shaft assembly to better adapt to the needs of large-scale production. The main shaft of this utility model can better meet the performance and reliability requirements of large-megawatt wind turbine generators for the main shaft.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, the front main shaft body is a flared, variable-diameter structure with an inner diameter that gradually decreases from front to back.

[0009] The beneficial effect of adopting the above-mentioned further solution is that the front end is connected to the wheel hub, which can achieve gradual load transfer while ensuring the rigidity of the connection with the wheel hub, and avoid local high stress at the bolt connection.

[0010] Furthermore, the front main shaft, the middle main shaft, and the rear main shaft are hollow structures.

[0011] The beneficial effect of adopting the above-mentioned further solution is that the front spindle body, middle spindle body and rear spindle body are hollow structures, which not only reduces the weight of the spindle and the load on the bearings and tower, but also achieves efficient material distribution while ensuring strength, and can also provide wiring space.

[0012] Furthermore, the two ends of the middle spindle are respectively connected to the front spindle and the rear spindle by welding, splines, bolts, profiles or interference fit.

[0013] Furthermore, a front limiting shoulder and a rear limiting shoulder are respectively provided on the inner walls at both ends of the bearing housing. The outer wall of the front bearing outer ring is connected to the inner wall of the bearing housing, and the rear end of the front bearing outer ring abuts against the front limiting shoulder. The outer wall of the rear bearing outer ring is connected to the inner wall of the bearing housing, and the rear end of the rear bearing outer ring abuts against the rear limiting shoulder.

[0014] The beneficial effects of adopting the above-mentioned further solution are that the front and rear limiting shoulders play a positioning and limiting role for the bearing outer ring. During the operation of the wind turbine, the bearing outer ring is subjected to various forces, and the limiting shoulders can prevent the bearing outer ring from shifting in the axial and radial directions, ensuring the installation accuracy and operational stability of the bearing. At the same time, it also facilitates the installation and disassembly of the bearing, improving maintenance efficiency.

[0015] Furthermore, multiple rows of front rollers can be provided between the outer ring of the front bearing and the front main shaft, and multiple rows of rear rollers can also be provided between the outer ring of the rear bearing and the rear main shaft. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of the main shaft of this utility model;

[0018] Figure 2 This is a three-dimensional sectional view of the main shaft of this utility model;

[0019] Figure 3 This is a planar sectional view of the main shaft of this utility model;

[0020] In the diagram, 1. Front spindle body; 2. Front roller; 3. Front bearing outer ring; 4. Bearing housing; 5. Middle spindle body; 6. Rear roller; 7. Rear bearing outer ring; 8. Rear spindle body; 9. Front stop shoulder; 10. Rear stop shoulder. Detailed Implementation

[0021] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and do not imply any priority in order or any specific technical meaning. Furthermore, the concepts of "connection" and "linkage" mentioned in this application, unless otherwise specified, are considered to include both direct connection (linkage) and indirect connection (linkage).

[0022] When interpreting the description of this application, it should be clarified that terms such as "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating directions or positional relationships, are based on the perspective and layout shown in the accompanying drawings. They are intended to facilitate explanation and simplify the description process, and are not absolute limitations on the actual location, construction method, or operating mode of the described device or element. Therefore, these terms should not be construed as restrictive interpretations of the content of this application.

[0023] The principles and features of this utility model are described below with reference to examples. The examples are only used to explain this utility model and are not intended to limit the scope of this utility model.

[0024] like Figure 1 - Figure 3 As shown, a wind turbine generator main shaft assembly includes a front main shaft body 1, a middle main shaft body 5, a rear main shaft body 8, a front bearing outer ring 3, a rear bearing outer ring 7, a bearing housing 4, front rollers 2, and rear rollers 6. The bearing housing 4 has an axially penetrating inner cavity. The front bearing outer ring 3 is installed at the front end of the bearing housing 4, and the rear bearing outer ring 7 is installed at the rear end of the bearing housing 4. The front bearing outer ring 3 is sleeved on the front main shaft body 1, and a plurality of front rollers 2 are disposed in the annular space formed between the front bearing outer ring 3 and the front main shaft body 1. The rear bearing outer ring 7 is sleeved on the rear main shaft body 8, and a plurality of rear rollers 6 are disposed in the annular space formed between the rear bearing outer ring 7 and the rear main shaft body 8. The two ends of the middle main shaft body 5 are respectively connected to the front main shaft body 1 and the rear main shaft body 8.

[0025] In this embodiment, the front main shaft 1 is a flared variable diameter structure with a diameter that gradually decreases from front to back.

[0026] The front spindle body 1, the middle spindle body 5, and the rear spindle body 8 are all hollow structures, which not only reduces the weight of the spindle and the load on the bearings and tower, but also achieves efficient material distribution while ensuring strength, and provides space for wiring.

[0027] The embodiments of this utility model do not limit the connection method between the middle spindle body 5 and the front spindle body 1 and the rear spindle body 8. The two ends of the middle spindle body 5 can be connected to the front spindle body 1 and the rear spindle body 8 by welding, spline connection, bolt connection, profile connection or interference fit.

[0028] The bearing housing 4 has a front limiting shoulder 9 and a rear limiting shoulder 10 on its inner walls at the front and rear ends, respectively. The outer wall of the front bearing outer ring 3 is connected to the inner wall of the bearing housing 4, and the rear end of the front bearing outer ring 3 abuts against the front limiting shoulder 9. The outer wall of the rear bearing outer ring 7 is connected to the inner wall of the bearing housing 4, and the rear end of the rear bearing outer ring 7 abuts against the rear limiting shoulder 10. The front limiting shoulder 9 and the rear limiting shoulder 10 provide positioning and limiting for the bearing outer ring. During the operation of the wind turbine, the bearing outer ring is subjected to various forces. The limiting shoulders prevent the bearing outer ring from shifting axially and radially, ensuring the installation accuracy and operational stability of the bearing. They also facilitate the installation and disassembly of the bearing, improving maintenance efficiency.

[0029] In this embodiment, a row of tapered rollers is provided between the outer ring 3 of the front bearing and the front main shaft body 1, and a row of tapered rollers is provided between the outer ring 7 of the rear bearing and the rear main shaft body 8. In the main shaft assembly of a wind turbine generator set, the bearing needs to withstand complex loads from the wind turbine, including radial and axial forces. Tapered rollers can withstand large radial and axial loads simultaneously. Using tapered rollers can effectively distribute these loads and improve the bearing capacity and service life of the bearing.

[0030] In another embodiment, multiple rows of front rollers 2 may be provided between the outer ring 3 of the front bearing and the front main shaft 1, and multiple rows of rear rollers 6 may be provided between the outer ring 7 of the rear bearing and the rear main shaft 8. The number of roller rows can be adjusted according to actual working conditions, for example, set to three, four, or six rows. As long as the multi-row roller design can meet the operating requirements under specific load conditions, it should be within the protection scope of this application.

[0031] This invention uses the outer surfaces of the front main shaft body 1 and the rear main shaft body 8 directly as bearing raceways, forming an inner ring-less bearing system with the corresponding front bearing outer ring, rear bearing outer ring, front roller, and rear roller. Compared with traditional bearing structures, this avoids the relative movement between the inner ring and the main shaft (i.e., the "running" phenomenon) in traditional structures, improving the bearing's load-bearing capacity and enhancing the stability of the wind turbine generator main shaft assembly during operation. By splitting the main shaft into the front main shaft body 1, the middle main shaft body 5, and the rear main shaft body 8, the overall size of the main shaft is reduced, avoiding the complex process of forging a large main shaft as a whole, thereby reducing manufacturing costs. The segmented manufacturing method also reduces processing difficulty and improves production efficiency, enabling this wind turbine generator main shaft assembly to better adapt to the needs of large-scale production. The main shaft of this invention can better meet the performance and reliability requirements of large-megawatt wind turbine generators for the main shaft.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A wind turbine main shaft arrangement, characterized in that, The main shaft body (1), the middle main shaft body (5), the rear main shaft body (8), the front bearing outer ring (3), the rear bearing outer ring (7), the bearing seat (4), the front roller (2) and the rear roller (6) are included, the bearing seat (4) has an inner cavity axially through, the front bearing outer ring (3) is installed at one end of the bearing seat (4), and the rear bearing outer ring (7) is installed at the other end of the bearing seat (4); The front bearing outer ring (3) is sleeved outside the front main shaft body (1), and a plurality of front rollers (2) are arranged in the annular space formed between the front bearing outer ring (3) and the front main shaft body (1); The rear bearing outer ring (7) is sleeved outside the rear main shaft body (8), and a plurality of rear rollers (6) are arranged in the annular space formed between the rear bearing outer ring (7) and the rear main shaft body (8); the two ends of the middle main shaft body (5) are connected with the front main shaft body (1) and the rear main shaft body (8) respectively.

2. A wind turbine main shaft arrangement according to claim 1, wherein The front main shaft body (1) is a trumpet-shaped variable diameter structure with a gradually reduced inner diameter from front to back.

3. A wind turbine main shaft arrangement according to claim 1 or 2, characterised in that, The front main shaft body (1), the middle main shaft body (5) and the rear main shaft body (8) are hollow structures.

4. A wind turbine main shaft arrangement according to claim 3, wherein The two ends of the middle main shaft body (5) are connected with the front main shaft body (1) and the rear main shaft body (8) respectively by welding, spline, bolt, profile or interference fit.

5. A wind turbine main shaft arrangement according to claim 1, wherein The inner walls of the two ends of the bearing seat (4) are respectively provided with front and rear limiting shoulders (9) and (10), the outer wall of the front bearing outer ring (3) is connected with the inner wall of the bearing seat (4), the rear end of the front bearing outer ring (3) abuts against the front limiting shoulder (9), the outer wall of the rear bearing outer ring (7) is connected with the inner wall of the bearing seat (4), and the rear end of the rear bearing outer ring (7) abuts against the rear limiting shoulder (10).

6. A wind turbine main shaft arrangement according to claim 1, wherein One or more rows of front rollers (2) are arranged between the front bearing outer ring (3) and the front main shaft body (1); one or more rows of rear rollers (6) are also arranged between the rear bearing outer ring (7) and the rear main shaft body (8).

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