Axial displacement suppression device for main shaft of wind turbine generator
By using a limit ring and a suppression assembly in the axial displacement suppression device of the wind turbine main shaft, and using a spring and a spacer to apply axial force to the outer ring of the bearing, the problem of shortened gearbox and coupling life caused by the backward movement of the main shaft is solved, and the effect of simplifying installation and reducing maintenance costs is achieved.
Patent Information
- Application Number
- CN202423121527.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-12-17
AI Technical Summary
The main shaft bearings of existing wind turbines are prone to backward movement during long-term use, resulting in a shortened service life of the gearbox and coupling. Existing solutions are complex and costly, and the friction gaskets have a short service life and require frequent replacement.
A wind turbine main shaft axial displacement suppression device is designed, which includes a main shaft, a bearing seat, a limiting ring, a suppression assembly and an adjustment screw. The suppression assembly is installed through the boss and mounting hole on the limiting ring. The spring and spacer are used to apply axial force to the outer ring of the bearing to suppress the backward movement of the main shaft.
It effectively suppresses the axial displacement of the main shaft and bearings, simplifies the installation process, reduces maintenance costs, and improves the use effect of wind turbines.
Smart Images
Figure CN223359305U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of wind power generation equipment, in particular to a device for suppressing the axial displacement of a main shaft of a wind turbine generator set. Background Art
[0002] 2MW wind turbines have been operating in the market for nearly ten years. Among the 2MW wind turbines that have been put into use, many use spherical roller bearings for their main shaft bearings. These bearings have a certain aligning function and are simpler in structure than tapered roller bearings, resulting in lower economic costs.
[0003] Currently, a common fault in wind turbines during long-term operation is shaft back-slip. Although initial shaft displacement does not affect the unit's power generation, large components such as the gearbox and coupling require load-bearing operation, which can affect their service life. Furthermore, the initial displacement does not trigger a fault alarm or shutdown, so many owners are unable to determine the extent of the back-slip and shut down the unit for repairs. This leads to increased bearing wear and increasing shaft displacement, until the rotor collides with the nacelle and the unit becomes inoperable, or the gearbox support arm completely engages the elastic support. There are two main existing solutions: one is to hoist the main shaft system off the tower, replace the bearings with new ones, then hoist it back up the tower, restore the main shaft to its original design position, and restart the unit. The other is to install a split end cap on the side of the bearing away from the rotor. A friction shim assembly is installed on the split end cap to abut the bearing inner ring. The bearing seat supports the friction shim assembly through the split end cap. The friction shim assembly applies axial force to the bearing inner ring toward the rotor, thereby suppressing shaft back-slip.
[0004] There are at least the following problems in the existing technology: first, the process of hoisting onto and off the tower is complicated and dangerous, and the maintenance cost is high; second, the axial force provided by the friction gasket group to the main shaft toward the wind wheel acts on the inner ring of the bearing, and the inner ring of the bearing rotates with the main shaft. Although this inhibits the backward movement of the main shaft, it also creates a certain resistance to the rotation of the main shaft, and the service life of the friction gasket is also short, and it needs to be replaced frequently. Utility Model Content
[0005] In view of the shortcomings of the existing technology, the utility model develops an axial displacement suppression device for the main shaft of a wind turbine generator set. The utility model can not only suppress the axial displacement of the bearing and the main shaft, but also facilitate installation and adjustment, avoid frequent replacement and maintenance, effectively improve the use effect of the wind turbine generator set, and reduce maintenance costs.
[0006] The technical solution to the technical problem solved by the utility model is: a wind turbine main shaft axial displacement suppression device, including a main shaft and a bearing seat, the main shaft is arranged on the bearing seat through a bearing, end covers are provided on both sides of the bearing seat through bolts, a limiting ring is provided between the bearing seat and a group of end covers, and a plurality of suppression components are evenly provided on the limiting ring, the suppression component includes an adjusting screw, a spacer and a spring, the spacer and the spring are arranged on the limiting ring through the adjusting screw, and the first end of the spacer abuts against the outer ring of the bearing.
[0007] As an optimization, a boss is provided on the side of the retaining ring facing the bearing, with a mounting hole defined on the boss. The suppression assembly is positioned within the mounting hole. The boss and mounting hole facilitate installation of the suppression assembly and prevent it from tilting, allowing it to evenly apply axial pressure to the bearing, and thus the spindle.
[0008] As an optimization, the edge of the boss is matched with the bearing seat, which can facilitate the installation of the limit ring and avoid radial shaking.
[0009] As an optimization, the adjustment screw includes a head, a polished rod, and a screw rod. The screw rod of the adjustment screw passes through the spacer and the spring in sequence and is connected to the limit ring. The spacer and the spring are mounted on the polished rod. The head of the adjustment screw is set in the spacer, and the second end of the spacer is slidably set in the mounting hole. The head of the adjustment screw can prevent the spacer and the spring from falling out; the polished rod can ensure the stability and smoothness of the spacer and the spring when moving on the polished rod. The screw rod can be threadedly connected to the limit ring and is easy to adjust; the second end of the spacer is slidably set in the mounting hole, which can further ensure the stability and smoothness of the spacer and the spring when moving on the polished rod, and can prevent the spacer from skewing, ensuring that the spacer can stably apply axial pressure to the bearing.
[0010] As an optimization, the suppression assembly also includes a washer and an adjustment shim, which are mounted on the polished rod, with the washer positioned between the spring and the adjustment shim. The washer prevents the spring from damaging the adjustment shim, and the adjustment shim allows for the displacement of the bearing outer ring to be adjusted.
[0011] As an optimization, a flat washer is provided between the stop ring and a set of end caps. By providing the flat washer, the requirements of the original end cap structure can be met.
[0012] Compared with the prior art, the present invention has the following beneficial effects:
[0013] By providing a limit ring, a suppression assembly can be installed to suppress the axial displacement of the bearing and the main shaft; by providing an adjustment screw, the spacer and spring can be easily installed on the limit ring, and the tightness can be easily adjusted; by providing a spacer, it can directly abut against the outer ring of the bearing, suppressing the axial displacement of the bearing, thereby suppressing the axial backward movement of the main shaft; by providing a spring, it can push the spacer to abut against the outer ring of the bearing, suppressing the axial displacement of the bearing, thereby suppressing the axial backward movement of the main shaft. The utility model can not only suppress the axial displacement of the bearing and the main shaft, but also facilitate installation and adjustment, effectively improving the use effect of the wind turbine and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.
[0015] Figure 2 for Figure 1 A partial enlarged view of area A in the middle.
[0016] In the figure: 1. Main shaft; 2. Bearing seat; 3. Bearing; 4. End cover; 5. Limit ring; 6. Flat washer; 7. Adjusting screw; 8. Spacer; 9. Spring; 10. Washer; 11. Adjusting shim; 12. Boss; 13. Mounting hole. DETAILED DESCRIPTION
[0017] In order to clearly illustrate the technical features of this solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.
[0018] Example 1
[0019] Figure 1 and Figure 2 An embodiment of the present invention is as follows: Figure 1 and Figure 2 As shown, a wind turbine main shaft axial displacement suppression device includes a main shaft 1 and a bearing seat 2. The main shaft 1 is set on the bearing seat 2 through a bearing 3. End covers 4 are provided on both sides of the bearing seat 2 by bolts. A limiting ring 5 is provided between the bearing seat 2 and a group of end covers 4 away from the wind wheel. Several groups of suppression components are evenly arranged circumferentially on the limiting ring 5. The suppression components include an adjusting screw 7, a spacer 8 and a spring 9. The spacer 8 and the spring 9 are set on the limiting ring 5 through the adjusting screw 7. The first end of the spacer 8 abuts against the outer ring of the bearing 3, and the spring 9 is a disc spring.
[0020] By setting the limit ring 5, the suppression component can be installed to suppress the axial displacement of the bearing 3 and the main shaft 1. By setting the adjustment screw 7, the spacer 8 and the spring 9 can be conveniently installed on the limit ring 5, and the tightness can be conveniently adjusted; by setting the spacer 8, it can directly abut against the outer ring of the bearing 3, suppressing the axial displacement of the bearing 3, thereby suppressing the axial backward movement of the main shaft 1; by setting the spring 9, the spacer 8 can be pushed to abut against the outer ring of the bearing 3, suppressing the axial displacement of the bearing 3, thereby suppressing the axial backward movement of the main shaft 1.
[0021] like Figure 1 and Figure 2 As shown, a boss 12 is provided on the side of the retaining ring 5 facing the bearing 3. The boss 12 is provided with a plurality of mounting holes 13 evenly distributed in a circular pattern. The suppression assembly is disposed within the mounting holes 13. The provision of the boss 12 and mounting holes 13 facilitates installation of the suppression assembly and prevents it from tilting, allowing it to uniformly apply axial pressure to the bearing 3, thereby uniformly applying axial force to the main shaft toward the rotor, thereby preventing the main shaft from moving backward.
[0022] like Figure 1 and Figure 2 As shown, the edge of the boss 12 is matched with the bearing seat 2. The limiting ring 5 can be easily installed to avoid radial shaking.
[0023] like Figure 1 and Figure 2 As shown, the adjusting screw 7 includes a head, a polished rod and a screw rod. The screw rod of the adjusting screw 7 passes through the spacer 8 and the spring 9 in sequence and is connected to the limit ring 5. The spacer 8 and the spring 9 are sleeved on the polished rod. The head of the adjusting screw 7 is arranged in the spacer 8, and the second end of the spacer 8 is slidably arranged in the mounting hole 13. The head of the adjusting screw 7 can prevent the spacer 8 and the spring 9 from falling out; the polished rod can ensure the stability and smoothness of the spacer 8 and the spring 9 when moving on the polished rod, and the screw rod can be threadedly connected to the limit ring 5 and is convenient for adjustment; the second end of the spacer 8 is slidably arranged in the mounting hole 13, which can further ensure the stability and smoothness of the spacer 8 and the spring 9 when moving on the polished rod, and can prevent the spacer 8 from skewing, ensuring that the spacer 8 can stably apply axial pressure to the bearing 3.
[0024] like Figure 1 and Figure 2 As shown, the suppression assembly further includes a washer 10 and an adjusting shim 11, which are sleeved onto the polished rod portion. The washer 10 is positioned between the spring 9 and the adjusting shim 11, and the adjusting shim 11 abuts against the mounting hole 13. The washer 10 prevents the spring 9 from damaging the adjusting shim 11; the adjusting shim 11 can be installed between the washer 10 and the mounting hole 13 to accommodate the displacement of the outer ring of the bearing 3.
[0025] like Figure 1 and Figure 2 As shown, a flat washer 6 is provided between the limiting ring 5 and a group of end caps 4 away from the wind wheel. The flat washer 6 is a split flat washer. By providing the flat washer 6, the requirements of the original end cap 4 structure can be met.
[0026] During use, the springs 9 in the evenly spaced groups of suppression assemblies steadily push the spacer 8 to abut against the outer ring of the bearing 3, providing the outer ring of the bearing 3 with an axial force toward the wind rotor. The outer ring of the bearing 3, through the rollers, suppresses the rearward movement of the inner ring of the bearing 3, thereby suppressing the rearward movement of the entire bearing 3. The inner ring of the bearing 3 also suppresses the rearward movement of the main shaft 1. This utility model not only suppresses the axial displacement of the bearing and the main shaft, but also facilitates installation and adjustment, effectively improving the performance of the wind turbine and reducing maintenance costs.
[0027] The descriptions of the orientation or relative position relationship of the structure in the present invention, such as the orientation or relative position relationship indicated by "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., are based on the orientation or position relationship shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.
Claims
1. A wind turbine main shaft axial displacement suppression device, comprising a main shaft (1) and a bearing seat (2), wherein the main shaft (1) is arranged on the bearing seat (2) via a bearing (3), and end covers (4) are provided on both sides of the bearing seat (2) via bolts, wherein: A limiting ring (5) is provided between the bearing seat (2) and a set of end covers (4). A plurality of suppression components are evenly provided on the limiting ring (5). The suppression components include an adjusting screw (7), a spacer (8) and a spring (9). The spacer (8) and the spring (9) are arranged on the limiting ring (5) through the adjusting screw (7). The first end of the spacer (8) abuts against the outer ring of the bearing (3).
2. The wind turbine main shaft axial displacement suppression device according to claim 1 is characterized in that: A boss (12) is provided on the side of the limiting ring (5) facing the bearing (3), a mounting hole (13) is provided on the boss (12), and the suppression component is arranged in the mounting hole (13).
3. The wind turbine main shaft axial displacement suppression device according to claim 2, characterized in that: The edge of the boss (12) matches the bearing seat (2).
4. The wind turbine main shaft axial displacement suppression device according to claim 3 is characterized by: The adjusting screw (7) comprises a head, a polished rod portion and a screw rod portion. The screw rod portion of the adjusting screw (7) passes through a spacer (8) and a spring (9) in sequence and is connected to a limiting ring (5). The spacer (8) and the spring (9) are sleeved on the polished rod portion. The head of the adjusting screw (7) is arranged in the spacer (8), and the second end of the spacer (8) is slidably arranged in the mounting hole (13).
5. The wind turbine main shaft axial displacement suppression device according to any one of claims 1 to 4, characterized in that: The suppression assembly further comprises a washer (10) and an adjusting washer (11). The washer (10) and the adjusting washer (11) are sleeved on the light rod portion, and the washer (10) is arranged between the spring (9) and the adjusting washer (11).
6. The wind turbine main shaft axial displacement suppression device according to claim 5, characterized in that: A flat washer (6) is provided between the limiting ring (5) and a set of end covers (4).