Thin-wall wind turbine generator main shaft structure

Abstract

The utility model discloses a thin-wall wind turbine generator main shaft structure, and belongs to the technical field of wind turbine generator equipment. A thin-wall wind turbine generator main shaft structure comprises a main shaft body, one end of the main shaft body is fixedly provided with a flange, the main shaft body is fixedly provided with a shaft shoulder, the outer wall of the main shaft body is provided with a first assembling area used for installing a bearing, and the first assembling area is arranged on the side, away from the flange, of the shaft shoulder. A second assembling area assembled with a gearbox is arranged at the other end of the main shaft body, the first assembling area and the second assembling area are connected through a transition part, and the interior of the main shaft body is of a cavity structure; the first assembly area and the second assembly area are fixedly arranged on the main shaft body, the installation accuracy of the first assembly area and the second assembly area is guaranteed, the machining accuracy of other parts can be reduced, the machining cost is reduced, the main shaft body is supported by a group of bearings, the axial length of the main shaft body can be reduced, and the machining efficiency is improved. The axial size is reduced, and the mounting effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine equipment technology, and in particular to a thin-walled wind turbine main shaft structure. Background Technology

[0002] Horizontal axis wind turbines are a widely used type of generator both domestically and internationally. They are mainly composed of blades, hubs, main shafts, gearboxes, and frames. In horizontal axis wind turbines, the main shafts receive various loads from the hubs, transmit torque to the gearboxes, and transmit axial thrust and aerodynamic bending moments to the frames.

[0003] Currently, mainstream horizontal axis wind turbine generators generally adopt an external main shaft drive scheme, where the hub and gearbox are connected via a main shaft structure. This drive scheme can be further divided into two types: one is a two-point support method with a main shaft (cantilever beam type), where there is a main bearing at each end of the main shaft, supporting the hub and gearbox respectively. The main shaft structure consists of a forged main shaft, spherical bearings, and thrust bearings. The other is a three-point support method with a main shaft (cantilever beam type), where the main bearing is mounted on one side of the hub as a rigid support, while the other two support points are located on the gearbox as elastic supports, capable of absorbing sudden loads from the hub. The main shaft structure consists of a forged main shaft and spherical bearings.

[0004] In the existing technology, the spindle is mostly made of forged spindle. The spindle and hub are mounted on the frame through multiple bearings. This spindle structure has the following disadvantages: the use of multiple bearings for support results in a large axial dimension of the spindle, which makes the axial dimension of the transmission chain composed of hub, spindle and gearbox long, thus resulting in a large axial dimension of the spindle structure. Utility Model Content

[0005] The purpose of this invention is to solve the problem that using multiple bearings for support in the prior art easily leads to a large axial dimension of the main shaft and occupies a large installation space, and to propose a thin-walled wind turbine main shaft structure.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A thin-walled wind turbine main shaft structure includes a main shaft body, a flange fixedly disposed at one end of the main shaft body, a shoulder fixedly disposed on the main shaft body, a first assembly area for mounting bearings disposed on the outer wall of the main shaft body, the first assembly area being disposed on the side of the shoulder away from the flange, and a second assembly area for assembling with a gearbox disposed at the other end of the main shaft body, the first assembly area and the second assembly area being connected by a transition portion, and the interior of the main shaft body being a hollow structure.

[0008] In order to reduce the weight of the spindle body while ensuring its strength, the cavity structure preferably includes a first through hole and a second through hole that are interconnected. The second through hole is located at one end near the second assembly area, and the inner diameter of the first through hole is larger than the inner diameter of the second through hole. The end of the first through hole near the flange transitions to the spindle body through a fillet.

[0009] To facilitate the processing of the cavity structure, the inner walls of the first through hole and the second through hole are further connected by a first curved surface and a second curved surface, with the first curved surface cooperating with the transition part.

[0010] To reduce the rate of change of the spindle body surface diameter, the transition portion further includes a first inclined surface and a second inclined surface, the first inclined surface and the second inclined surface are smoothly connected, and the second inclined surface intersects the extension line of the first curved surface projected on the front.

[0011] Furthermore, the small ends of both the first and second inclined surfaces extend toward the second assembly area.

[0012] Preferably, the flange and the other side of the shoulder are smoothly transitioned by an arc groove.

[0013] Compared with the prior art, the present invention provides a thin-walled wind turbine main shaft structure, which has the following advantages:

[0014] 1. The main shaft structure of this thin-walled wind turbine unit, by fixing a first assembly area and a second assembly area on the main shaft body, can reduce the machining accuracy of other parts and reduce machining costs while ensuring the installation accuracy of the first assembly area and the second assembly area. Moreover, by using a set of bearings to support the main shaft body, the axial length of the main shaft body can be reduced, the axial dimension can be reduced, and the installation effect can be improved.

[0015] 2. The main shaft structure of this thin-walled wind turbine can gradually reduce the diameter of the second assembly area by setting a first inclined surface and a second inclined surface on the main shaft body, thereby reducing the phenomenon of abrupt diameter changes on the outer wall of the main shaft body and helping to reduce stress concentration. Moreover, the second inclined surface intersects with the extension line of the projection of the first curved surface on the front. At this time, the second inclined surface and the first curved surface form a flared structure similar to a variable diameter, which can increase the contact area with the shaft body where the second assembly area is located, improve the connection strength of the second assembly area, and ensure the strength of the main shaft body.

[0016] The parts not covered in this device are the same as or can be implemented using existing technology. This utility model, by fixing a first assembly area and a second assembly area on the main spindle body, can reduce the processing accuracy of other parts and reduce processing costs while ensuring the installation accuracy of the first assembly area and the second assembly area. Moreover, by using a set of bearings to support the main spindle body, the axial length of the main spindle body can be reduced, the axial dimension can be reduced, and the installation effect can be improved. Attached Figure Description

[0017] Figure 1 This utility model provides a structural schematic diagram of a thin-walled wind turbine main shaft structure. Figure 1 ;

[0018] Figure 2 This utility model provides a structural schematic diagram of a thin-walled wind turbine main shaft structure. Figure 2 ;

[0019] Figure 3 A cross-sectional view of the main shaft structure of a thin-walled wind turbine proposed in this utility model. Figure 1 ;

[0020] Figure 4 A cross-sectional view of the main shaft structure of a thin-walled wind turbine proposed in this utility model. Figure 2 .

[0021] In the figure: 1. Spindle body; 2. Flange; 3. Shoulder; 4. First assembly area; 5. First inclined surface; 6. Second inclined surface; 7. Second assembly area; 8. First through hole; 9. Second through hole; 10. Arc groove; 11. First curved surface; 12. Second curved surface. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0024] Example:

[0025] Reference Figures 1-4A thin-walled wind turbine main shaft structure includes a main shaft body 1. A flange 2 is fixedly installed at one end of the main shaft body 1. Multiple evenly distributed mounting holes are provided on the flange 2, ranging from two to ten, preferably six. The six mounting holes are evenly distributed circumferentially for easy connection with the hub. A shoulder 3 is fixedly installed on the main shaft body 1. A first assembly area 4 for mounting bearings is provided on the outer wall of the main shaft body 1, and the first assembly area 4 is located on the side of the shoulder 3 away from the flange 2. When installing the bearing, the shoulder 3 can limit the bearing on one side. A second assembly area 7 for assembling with a gearbox is provided at the other end of the main shaft body 1. The first assembly area 4 and the second assembly area 7 are connected by a transition part. The main shaft body 1 has a hollow internal structure, which can reduce the overall weight of the main shaft body 1. Other devices for wind turbines can be installed in the hollow structure of the main shaft body 1, thereby effectively utilizing the space in the hollow structure of the main shaft body 1 and improving the performance.

[0026] In use, by fixing the first assembly area 4 and the second assembly area 7 on the spindle body 1, the machining accuracy of other parts can be reduced while ensuring the installation accuracy of the first assembly area 4 and the second assembly area 7, thus reducing machining costs. Moreover, by using a set of bearings to support the spindle body 1, the axial length of the spindle body 1 can be reduced, the axial dimension can be reduced, and the installation effect can be improved.

[0027] Reference Figure 3 and Figure 4 Here, we design the cavity structure as a first through hole 8 and a second through hole 9 that are interconnected. The second through hole 9 is located at one end near the second assembly area 7, and the inner diameter of the first through hole 8 is larger than the inner diameter of the second through hole 9. The effective axial length of the first through hole 8 is larger than the effective axial length of the second through hole 9. Moreover, the end of the first through hole 8 near the flange 2 is transitioned to the spindle body 1 with a fillet, which can reduce the stress concentration on the inner wall of the spindle body 1. In use, by opening the first through hole 8 and the second through hole 9 in the spindle body 1, not only can the overall weight of the spindle body 1 be reduced, but it is also convenient for other components to pass through or be installed in the cavity of the spindle body 1, thereby improving the performance.

[0028] Reference Figure 4 We connect the inner walls of the first through hole 8 and the second through hole 9 through the transition of the first curved surface 11 and the second curved surface 12. The joint of the first curved surface 11 and the second curved surface 12 is rounded for transition. Moreover, the first curved surface 11 cooperates with the transition part. In use, the first curved surface 11 and the second curved surface 12 make a smooth transition at the joint of the first through hole 8 and the second through hole 9. During forging, it is not only easy to process, but also reduces the phenomenon of cracking at the corner, thus ensuring the quality of the spindle body 1.

[0029] Reference Figure 1 , Figure 3 and Figure 4 Here, we design the transition section as a first inclined surface 5 and a second inclined surface 6, which smoothly transitions the junction of the first inclined surface 5 and the second inclined surface 6. Moreover, the second inclined surface 6 intersects with the extension line of the projection of the first curved surface 11 on the front side. That is to say, the second inclined surface 6 and the first curved surface 11 form a flared structure similar to a variable diameter, which can increase the contact area with the shaft where the second assembly area 7 is located and improve the connection strength of the second assembly area 7. At this time, the small ends of the first inclined surface 5 and the second inclined surface 6 both extend towards the second assembly area 7. In use, by setting the first inclined surface 5 and the second inclined surface 6 on the spindle body 1, the diameter of the second assembly area 7 can be gradually reduced, reducing the phenomenon of abrupt diameter changes on the outer wall of the spindle body 1, which helps to reduce stress concentration and improve the strength of the spindle body 1.

[0030] Reference Figure 1 and Figure 4 On the other side of the flange 2 and the shoulder 3, there is a smooth transition through the arc groove 10. In use, by using the arc groove 10 at the shoulder 3 and the flange 2 for transition, the stress concentration at the connection between the shoulder 3 and the flange 2 can be reduced, and the strength of use can be guaranteed.

[0031] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A thin-walled wind turbine main shaft structure, characterized in that, Including main shaft body (1), one end of the main shaft body (1) is fixedly provided with flange (2); The main shaft body (1) is fixedly provided with a shaft shoulder (3); The outer wall of the main shaft body (1) is provided with a first assembly area (4) for installing bearing, the first assembly area (4) is arranged on the side of the shaft shoulder (3) away from the flange (2), and the other end of the main shaft body (1) is provided with a second assembly area (7) assembled with the gear box; The first assembly area (4) and the second assembly area (7) are connected through a transition part, and the main shaft body (1) is a cavity structure; The cavity structure includes a first through hole (8) and a second through hole (9) in communication with each other, the second through hole (9) is arranged at one end close to the second assembly area (7), and the inner diameter of the first through hole (8) is greater than that of the second through hole (9); The first through hole (8) is connected to the main shaft body (1) through a fillet at one end close to the flange (2); The inner walls of the first through hole (8) and the second through hole (9) are connected through a first curved surface (11) and a second curved surface (12), and the first curved surface (11) is matched with the transition part; The transition part includes a first inclined surface (5) and a second inclined surface (6), the combination of the first inclined surface (5) and the second inclined surface (6) is smoothly connected, the second inclined surface (6) intersects with the extension line of the front projection of the first curved surface (11); The small end of the first inclined surface (5) and the second inclined surface (6) extends to the direction of the second assembly area (7).

2. A thin-walled main shaft structure of a wind turbine generator set according to claim 1, characterized in that, The flange (2) and the other side of the shaft shoulder (3) are smoothly connected through an arc-shaped groove (10).

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