A bearing assembly suitable for deep offshore megawatt wind turbines

Abstract

The application discloses a bearing assembly suitable for a deep-sea megawatt fan, which comprises an outer ring and an inner ring, wherein a raceway is arranged on the inner ring, a retainer is arranged in the raceway, a composite sealing assembly is arranged on the inner wall of the inner ring and close to the end face, a rolling element assembly is arranged in the raceway between the inner ring and the outer ring, and a plurality of correction execution assemblies are distributed equidistantly on the end face of the retainer; the bearing assembly adopts a three-row roller structure, can simultaneously bear radial load, axial load and overturning moment, improves the bearing capacity, forms a labyrinth sealing structure through the composite sealing assembly, effectively blocks seawater and dust from invading, cooperates with a drainage groove and a water outlet hole to quickly drain the leaked water, reduces the corrosion risk, collects running signals in real time through the correction execution assembly and dynamically corrects the unbalance, reduces vibration and wear, prolongs the service life, and has a reliable overall structure, perfect protection and strong stability, and can be adapted to a deep-sea harsh environment for a long time.

Description

Technical Field

[0001] This application relates to the field of bearing assembly technology, and more specifically, to a bearing assembly suitable for deep-sea megawatt wind turbines. Background Technology

[0002] As offshore wind power rapidly develops towards deep-sea and large-megawatt directions, the single-unit capacity of wind turbines continues to increase, and the operating conditions become more stringent. As the core component of the main shaft, the bearing assembly must simultaneously withstand strong radial and axial loads and overturning moments. Existing conventional bearings are mostly single-row or double-row roller structures, which have insufficient load-bearing capacity and rigidity, and are prone to problems such as accelerated wear, uneven load, and shortened life.

[0003] In addition, the deep-sea environment is characterized by high salt spray, high humidity and strong corrosion. Traditional bearings only use simple rubber rings or single-layer seals, which have poor sealing and protection effects and cannot resist the erosion of the harsh marine environment for a long time. The frequency of maintenance and costs increase significantly. At the same time, large-megawatt wind turbines are prone to unbalanced vibration under conditions such as gusts, pitch changes, and start-up and shutdown. Conventional bearings do not have the ability to correct this in real time. Vibration will accelerate the wear and tear of the whole machine components and increase the risk of failure. Summary of the Invention

[0004] The purpose of this application is to provide a bearing assembly suitable for deep-sea large-megawatt wind turbines to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this application provides the following technical solution: a bearing assembly suitable for deep-sea large-megawatt wind turbines, comprising an outer ring and an inner ring, wherein the inner ring is provided with a raceway, a cage is installed inside the raceway, a composite sealing assembly is installed on the inner wall of the inner ring near the end face, a rolling element assembly is installed inside the cage, the rolling element assembly is located in the raceway between the inner ring and the outer ring, and multiple correction actuators are circumferentially equidistantly distributed on the end face of the cage.

[0006] Preferably, the composite sealing assembly includes a first rubber ring and a second rubber ring, the inner wall of the inner ring is provided with a first groove and a second groove respectively, the first rubber ring and the second rubber ring are sequentially embedded in the first groove and the second groove, and the outer side of the second rubber ring is integrally formed with a dustproof lip.

[0007] Preferably, the rolling element assembly includes radial rollers, a first axial roller, and a second axial roller. The radial rollers, the first axial roller, and the second axial roller are all installed inside the cage. The radial rollers are arranged in a cross pattern, and the first axial roller and the second axial roller are located on both sides of the radial rollers, forming a three-row roller structure.

[0008] Preferably, the calibration execution component includes mounting slots equidistantly spaced on the outer wall of the cage, each mounting slot housing a micro motor, the rotating shaft of the micro motor being fixedly connected to a threaded rod, one end of the threaded rod being rotatably mounted on the inner wall of one end of the mounting slot, a balance block being threaded onto the threaded rod, and sensor groups being equidistantly mounted on both sides of the inner ring.

[0009] Preferably, both sides of the inner ring are provided with circumferential drainage grooves, and the drainage grooves are provided with L-shaped water outlet holes. The drainage grooves and the water outlet holes are interconnected and located on the outside of the composite sealing assembly.

[0010] Preferably, the outer walls of both the first and second rubber rings are provided with trapezoidal protrusions, and the inner walls of the first and second buckle grooves are provided with grooves of matching shape corresponding to the trapezoidal protrusions.

[0011] Preferably, each of the sensor groups includes a vibration sensor and a displacement sensor for acquiring bearing operating status signals.

[0012] Preferably, the outer walls of both the inner ring and the outer ring are provided with an anti-corrosion coating, which consists of a primer and a topcoat, wherein the primer is epoxy zinc-rich and the topcoat is polyurethane.

[0013] Preferably, a sealing ring is provided between the inner ring and the outer ring, near the end face.

[0014] Preferably, the diameter of the water outlet hole is greater than 1 mm, and the number is not less than 8.

[0015] Compared with the prior art, the beneficial effects of this application are as follows: The bearing assembly of this application adopts a three-row roller structure, which can simultaneously withstand radial and axial loads and overturning moments, thereby improving the load-bearing capacity. The composite sealing component forms a labyrinth seal structure, which effectively prevents seawater and dust from entering. With the help of drainage grooves and water outlets, leakage water can be quickly discharged, reducing the risk of corrosion. The calibration execution component collects operating signals in real time and dynamically corrects the imbalance, reducing vibration and wear, and extending service life. The overall structure is reliable, well protected, and highly stable, and can adapt to the harsh environment of deep sea for a long time. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of this application;

[0017] Figure 2 This is a partial cross-sectional structural diagram of an embodiment of this application;

[0018] Figure 3 Examples of this application Figure 2 A magnified structural diagram of part A in the middle;

[0019] Figure 4 This is a side view of an embodiment of the present application.

[0020] Figure 5 This is a schematic diagram of the front cross-sectional structure of an embodiment of this application;

[0021] Figure 6 Examples of this application Figure 5 A magnified structural diagram of part B.

[0022] In the picture:

[0023] 11. Outer ring; 12. Inner ring; 13. Sealing ring; 14. Drain groove; 15. Water outlet; 16. Cage; 17. Raceway;

[0024] 2. Composite sealing assembly; 21. First rubber ring; 22. Second rubber ring; 23. Dustproof lip; 24. First snap groove; 25. Second snap groove;

[0025] 3. Rolling element assembly; 31. Radial roller; 32. First axial roller; 33. Second axial roller;

[0026] 4. Calibration actuator; 41. Mounting slot; 42. Micro motor; 43. Threaded rod; 44. Balance weight; 45. Sensor group;

[0027] 5. Anti-corrosion coating. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] Please see Figure 1 The embodiments of this application provide a bearing assembly suitable for deep-sea megawatt wind turbines, including an outer ring 11 and an inner ring 12.

[0030] like Figure 1 , Figure 3 and Figure 5 As shown, the inner ring 12 is provided with a raceway 17, and a cage 16 is installed inside the raceway 17. A rolling element assembly 3 is installed inside the cage 16. A sealing ring 13 is provided between the inner ring 12 and the outer ring 11 and near the end face. The sealing ring 13 is located on the bearing end face and forms an inner and outer double sealing system with the composite sealing assembly 2 to further prevent external moisture and impurities from entering.

[0031] Among them, such as Figures 2-5As shown, the rolling element assembly 3 is located within the raceway 17 between the inner ring 12 and the outer ring 11. The rolling element assembly 3 includes radial rollers 31, a first axial roller 32, and a second axial roller 33. The radial rollers 31, the first axial roller 32, and the second axial roller 33 are all installed inside the cage 16. The radial rollers 31 are arranged in a cross pattern. The first axial roller 32 and the second axial roller 33 are located on both sides of the radial rollers 31, forming a three-row roller structure. The radial rollers 31 are arranged in a cross pattern to bear the radial load during wind turbine operation. The first axial roller 32 and the second axial roller 33 are located on both sides of the radial rollers 31 to bear the axial load, thereby improving the bearing capacity and adapting to the load requirements of large megawatt wind turbines.

[0032] Furthermore, both sides of the inner ring 12 are provided with circumferential drainage grooves 14, and the drainage grooves 14 are provided with L-shaped water outlet holes 15. The drainage grooves 14 and the water outlet holes 15 are interconnected and located on the outside of the composite sealing assembly 2. The circumferential drainage grooves 14 collect seawater and condensate that are in contact with the bearing end face, and gather the water into the L-shaped water outlet holes 15 and discharge it quickly, so as to prevent water from accumulating on the bearing end face or seeping into the raceway 17 and causing corrosion. In addition, the diameter of the water outlet holes 15 is greater than 1 mm and the number is not less than 8.

[0033] In this embodiment, as Figure 1 , Figure 5 and Figure 6 As shown, a composite sealing assembly 2 is installed on the inner wall of the inner ring 12 near the end face. The composite sealing assembly 2 includes a first rubber ring 21 and a second rubber ring 22. The inner wall of the inner ring 12 is provided with a first groove 24 and a second groove 25 respectively. The first rubber ring 21 and the second rubber ring 22 are sequentially embedded in the first groove 24 and the second groove 25. The outer side of the second rubber ring 22 is integrally formed with a dustproof lip 23. The first rubber ring 21 and the second rubber ring 22 are double-layered embedded and positioned through the first groove 24 and the second groove 25 to form a double sealing barrier. The protruding part of the dustproof lip 23 can fit against the outer wall of the inner ring 12 and, together with the first rubber ring 21 and the second rubber ring 22, form a labyrinth-type sealing structure, which effectively prevents seawater, salt spray, and sand dust in the deep sea environment from entering the bearing, while not affecting the normal rotation of the bearing.

[0034] Specifically, the outer walls of the first rubber ring 21 and the second rubber ring 22 are provided with trapezoidal protrusions, and the inner walls of the first retaining groove 24 and the second retaining groove 25 are provided with grooves of matching shape to the trapezoidal protrusions. The trapezoidal protrusions and the grooves that match the protrusions form a self-locking structure, which increases the contact area and bonding force between the rubber rings and the retaining grooves, prevents the rubber rings from loosening or shifting when the bearing rotates at high speed or vibrates strongly, and at the same time improves the sealing surface fit and enhances the sealing reliability.

[0035] like Figures 2-4 As shown, the end face of the retainer 16 is circumferentially equidistantly distributed with multiple correction execution components 4. Each correction execution component 4 includes mounting slots 41 equidistantly formed on the outer wall of the retainer 16. Each mounting slot 41 is equipped with a micro motor 42. The rotating shaft of the micro motor 42 is fixedly connected to a threaded rod 43. One end of the threaded rod 43 is rotatably mounted on the inner wall of one end of the mounting slot 41. A balance block 44 is threadedly connected to the threaded rod 43. The balance block 44 has a mass of 50-200g and is made of high-density tungsten alloy. Sensor groups 45 are equidistantly installed on both sides of the inner ring 12.

[0036] In the calibration execution component 4, the mounting slot 41 provides built-in installation space for the micro motor 42, threaded rod 43, and drive balance block 44, avoiding interference with the rolling element component 3. The micro motor 42 drives the threaded rod 43 to rotate, which in turn drives the drive balance block 44 to move precisely along the axial direction, facilitating real-time adjustment of the bearing imbalance. The sensor group 45 monitors the operating status in real time.

[0037] Furthermore, each of the sensor groups 45 includes a vibration sensor and a displacement sensor for collecting bearing operating status signals. The vibration sensor monitors the bearing vibration amplitude and frequency in real time, while the displacement sensor detects the relative displacement of the inner ring 12 and the outer ring 11, accurately identifying abnormal states such as imbalance, off-center load, and wear. Multi-dimensional signal acquisition provides accurate data support for the correction execution component 4, which is beneficial for intelligent dynamic balance correction.

[0038] It should be noted that the vibration sensor has a range of ±50g and a frequency response range of 0.1Hz-10kHz, and is used to collect vibration acceleration signals. The displacement sensor has a range of 0~5mm and a resolution of ≤1μm, and is used to collect shaft center trajectory and relative displacement. The micro motor 42 has built-in PID closed-loop control.

[0039] The sensor signal is transmitted via a shielded cable to an edge computing unit (not shown in the figure) located outside the bearing housing, with a sampling frequency of ≥20kHz.

[0040] In another embodiment, refer to Figure 5 The outer walls of both the inner ring 12 and the outer ring 11 are provided with an anti-corrosion coating 5. The anti-corrosion coating 5 consists of a primer and a topcoat. The primer is epoxy zinc-rich, and the topcoat is polyurethane. The epoxy zinc-rich primer has excellent rust prevention, corrosion prevention, and adhesion, providing a bottom layer of anti-corrosion protection for the metal substrate. The polyurethane topcoat is resistant to salt spray, seawater erosion, and has strong weather resistance, forming an outer protective barrier. The double-layer anti-corrosion coating 5 can effectively resist corrosion from the high salt spray and high humidity environment of the deep sea, extending the service life of the bearing.

[0041] Based on the above technical solution, the working steps of this solution are summarized as follows: In this application, the raceway 17 on the inner ring 12 provides a motion track for the rolling element assembly 3, and the cage 16 limits the rolling element assembly 3 to prevent them from colliding with each other and ensure smooth operation.

[0042] The rolling element assembly 3 adopts a three-row roller structure, with radial rollers 31 arranged in a cross pattern to bear the radial load during wind turbine operation. The first axial roller 32 and the second axial roller 33 are located on both sides of the radial rollers 31 to bear the axial load, thereby improving the bearing capacity and adapting to the load requirements of large megawatt wind turbines.

[0043] The composite sealing assembly 2 is installed on the inner wall of the inner ring 12 near the end face. The first rubber ring 21 and the second rubber ring 22 are respectively embedded in the first snap groove 24 and the second snap groove 25. The trapezoidal protrusions on the outer walls of the first rubber ring 21 and the second rubber ring 22 cooperate with the convex grooves in the grooves to enhance the fixing strength. The first rubber ring 21, the second rubber ring 22 and the dustproof lip 23 form a labyrinth channel, which can block the intrusion of external dust and seawater and protect the internal structure of the bearing and shaft after assembly.

[0044] The calibration execution components 4 are equidistantly distributed along the circumferential end face of the cage 16. Each set of sensor groups 45 collects bearing operation signals in real time and controls the micro motor 42 to drive the threaded rod 43 to rotate based on the imbalance and phase identified by the algorithm. This drives the balance block 44 to move, thereby achieving bearing attitude correction and bringing the combined imbalance close to zero. The mounting groove 41 allows the micro motor 42, threaded rod 43, and balance block 44 to avoid the rollers. In addition, the drainage grooves 14 on both sides of the inner ring 12 cooperate with the L-shaped water outlet holes 15 to promptly drain the infiltrated seawater, further ensuring the stable operation of the bearing in the deep-sea environment.

[0045] All parts not covered in this application are the same as or can be implemented using existing technology. Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bearing assembly suitable for use in a deep offshore megawatt wind turbine, characterized in that, Including the outer ring (11) and the inner ring (12); The inner ring (12) is provided with a raceway (17), a cage (16) is installed inside the raceway (17), a composite sealing assembly (2) is installed on the inner wall of the inner ring (12) near the end face, a rolling element assembly (3) is installed inside the cage (16), the rolling element assembly (3) is located in the raceway (17) between the inner ring (12) and the outer ring (11), and multiple correction execution components (4) are circumferentially distributed on the end face of the cage (16).

2. A bearing assembly suitable for deep offshore megawatt wind turbines according to claim 1, characterized in that: The composite sealing assembly (2) includes a first rubber ring (21) and a second rubber ring (22). The inner wall of the inner ring (12) is provided with a first groove (24) and a second groove (25). The first rubber ring (21) and the second rubber ring (22) are sequentially embedded in the first groove (24) and the second groove (25). The outer side of the second rubber ring (22) is integrally formed with a dustproof lip (23).

3. The bearing assembly suitable for deep offshore megawatt wind turbines as claimed in claim 1 wherein: The rolling element assembly (3) includes radial rollers (31), a first axial roller (32), and a second axial roller (33). The radial rollers (31), the first axial roller (32), and the second axial roller (33) are all installed inside the cage (16). The radial rollers (31) are arranged in a cross pattern. The first axial roller (32) and the second axial roller (33) are located on both sides of the radial rollers (31), forming a three-row roller structure.

4. The bearing assembly for deep-sea megawatt wind turbines according to claim 1, characterized in that: The calibration execution component (4) includes mounting slots (41) equidistantly spaced on the outer wall of the retainer (16) at circumferential intervals. Each mounting slot (41) is equipped with a micro motor (42). The rotating shaft of the micro motor (42) is fixedly connected to a threaded rod (43). One end of the threaded rod (43) is rotatably mounted on the inner wall of one end of the mounting slot (41). A balance block (44) is threaded onto the threaded rod (43). Sensor groups (45) are equidistantly spaced on both sides of the inner ring (12).

5. The bearing assembly for deep-sea large-megawatt wind turbines according to claim 1, characterized in that: Both sides of the inner ring (12) are provided with circumferential drainage grooves (14), and the drainage grooves (14) are provided with L-shaped water outlet holes (15). The drainage grooves (14) and the water outlet holes (15) are interconnected and located on the outside of the composite sealing assembly (2).

6. The bearing assembly for deep-sea megawatt wind turbines according to claim 1, characterized in that: The outer walls of the first rubber ring (21) and the second rubber ring (22) are provided with trapezoidal protrusions, and the inner walls of the first buckle groove (24) and the second buckle groove (25) are provided with grooves of matching shape corresponding to the trapezoidal protrusions.

7. The bearing assembly for deep-sea megawatt wind turbines according to claim 1, characterized in that: Each of the sensor groups (45) includes a vibration sensor and a displacement sensor for collecting bearing operating status signals.

8. The bearing assembly for deep-sea megawatt wind turbines according to claim 1, characterized in that: The outer walls of the inner ring (12) and the outer ring (11) are provided with anti-corrosion coating (5). The anti-corrosion coating (5) consists of a primer and a topcoat, and the primer is epoxy zinc-rich and the topcoat is polyurethane.

9. The bearing assembly for deep-sea large-megawatt wind turbines according to claim 8, characterized in that: A sealing ring (13) is provided between the inner ring (12) and the outer ring (11) and near the end face.

10. The bearing assembly for deep-sea large-megawatt wind turbines according to claim 1, characterized in that: The diameter of the water outlet (15) is greater than 1 mm and the number is not less than 8.

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