Wind power main shaft sliding bearing based on corrugated pipe-oil composite support

Abstract

The invention discloses a wind power main shaft sliding bearing bush based on corrugated pipe-oil composite support, and aims to solve the technical problems of insufficient adaptability and high operation and maintenance cost of a traditional bearing under dynamic load of a wind turbine generator. In the operation process of a wind turbine generator, aerodynamic loads of blades and wind regime fluctuation cause a main shaft to bear dynamically-changed radial loads and tipping moments, the rigidity-damping characteristic of a traditional bearing is difficult to adapt to working condition fluctuation, and oil film instability, local abrasion and the like are easily caused. By adopting the composite supporting structure formed by the corrugated pipe and the internal oil liquid, the supporting rigidity and damping can be adaptively adjusted in real time according to the dynamic load by utilizing the synergistic effect of the elastic deformation of the metal corrugated pipe and the viscous damping of the oil liquid, so that the adverse effects caused by main shaft dislocation and sudden load change are effectively counteracted; the oil film stability and the bearing bearing reliability are ensured. Meanwhile, the bearing adopts a sectional design, the corrugated pipe and the bearing bush can be independently disassembled and replaced on the tower, the rotor does not need to be disassembled, the replacement convenience is greatly improved, and the operation and maintenance cost is reduced. The bearing is suitable for low-rotating-speed and heavy-load harsh working conditions of a large-megawatt wind turbine generator, and the operation stability and the service life of a transmission chain can be remarkably improved and prolonged.

Description

Technical Field

[0001] This invention relates to the field of wind power generation, and in particular to a novel corrugated pipe-supported sliding bearing for wind turbine main shafts. Background Technology

[0002] As wind turbines rapidly develop towards ultra-large megawatt-class (10MW and above) and offshore applications, the main shaft sliding bearing, as a core load-bearing component of the transmission chain, faces increasingly stringent operating conditions. Existing technologies face numerous insurmountable technical difficulties in terms of adaptability, stability, and durability. One major challenge is shaft alignment control under dynamic loads: aerodynamic load fluctuations on the blades of large-megawatt turbines, gust impacts, and overturning moments of millions of Newton-meters cause the main bearing to experience dynamically changing radial loads and moments, resulting in continuous deviation of the main shaft's centerline trajectory. Existing sliding bearings often employ elastic block supports, which are prone to edge wear under long-term low-speed, heavy-load conditions, leading to support stiffness drift and an inability to continuously compensate for shaft misalignment. Furthermore, the frequent gusts, turbulence, and grid fluctuations encountered during wind turbine operation can cause instantaneous load changes. The fixed damping characteristics of existing sliding bearing support structures prevent real-time adjustment of the stiffness-damping matching relationship, making it difficult to buffer instantaneous impact loads. Therefore, the aforementioned technical difficulties make it difficult for existing sliding main bearings to meet the core requirements of "long life, high reliability, and low maintenance" for large-megawatt and offshore wind turbines, becoming a key bottleneck restricting the large-scale engineering application of sliding bearings. There is an urgent need to develop new support and structural solutions with dynamic adaptive capabilities to address the aforementioned technical pain points. Summary of the Invention

[0003] To address the aforementioned problems in existing technologies, this invention provides a novel sliding bearing for wind turbine main shafts based on a bellows-oil composite support. This bearing solves the main shaft support problem under dynamic loads, the edge wear problem under low-speed heavy loads, and the stiffness-damping adaptive problem under sudden load changes. To achieve the above-mentioned objectives, this invention provides a wind turbine main shaft sliding bearing based on a bellows-oil composite support. Its core structure is composed of a bearing shell (1), a support element (2), and a bearing housing (3). The bearing shell (1) is a lubricating component that directly contacts the wind turbine main shaft, and its bottom plane is fully fitted with the upper end face of the support element (2). The support element (2) is a core functional component, which is integrally embedded in the concave area of ​​the bearing housing (3). The bearing housing (3) is used to achieve positioning and fixation with the wind turbine drive chain housing. The support element (2) is an array-distributed composite support unit assembly of "support column-bellows-oil", specifically including support column (4), bellows (5), sealing ring (6), support base (7) and oil (8). The structure and connection relationship of each component are as follows: Support base (7): A rigid block component adapted to the mounting surface of bearing seat (3). The upper end surface of bearing seat (3) is provided with several mounting holes in an array of M rows and N columns to realize the positioning of the composite support unit. Support column (4): A rigid metal cylindrical component, the number of which corresponds one-to-one with the mounting holes of the support base (7), and its lower end is fixed inside the bellows (5). There is a gap between the support column (4) and the bellows (5), which is filled with oil (8). Its upper end extends to the bottom of the bearing (1), providing support stiffness to the bearing. The middle section of the support column (4) protrudes slightly, further reducing the gap between it and the bellows (5) to form a damping hole. Bellows (5): A multi-peaked telescopic component made of stainless steel. Each bellows (5) is coaxially fitted on the outside of the corresponding support column (4). Its axial length is slightly longer than that of the support column (4) to ensure that there is still a certain gap between the support column (4) and the support base (7) after installation. The upper edge of the bellows (5) is sealed and fitted to the upper end of the support column (4) through a sealing ring (6), and the lower edge is sealed and connected to the upper end face of the support base (7) through another set of sealing rings (6), so that a closed annular oil receiving cavity is formed between the bellows (5) and the support column (4). Oil (8) and sealing ring (6): The annular oil receiving cavity is filled with high-viscosity hydraulic oil, and the sealing ring (6) is made of oil-resistant material to ensure the sealing performance of the oil receiving cavity. When the bearing (1) is subjected to a load and moves downward, the oil (8) will also flow from top to bottom through the damping hole. Due to the high viscosity of the oil (8) and its passage through the damping hole, the oil will provide damping force to the bearing. Attached Figure Description Figure 1 This invention provides a wind turbine main shaft sliding bearing based on bellows support. Figure 2 It is a bellows-oil composite support unit; Figure 3 These are the mounting holes at the bottom of the bearing bush; Figure 4 These are the mounting holes on the upper surface of the bearing housing. Detailed Implementation The embodiments of the present invention will now be described in further detail and in completeness with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention. The embodiments of the present invention include the following parts: like Figure 1As shown, a bellows-oil composite array type composite support bearing consists of a bearing shell 1, a support element 2, and a bearing housing 3. The support element 2 is composed of a support column 4, a bellows 5, a sealing ring 6, a support base 7, and a filling oil 8. The support element 2 is fixed above the bearing housing 3, and the bearing shell 1 is fitted onto the top of the support element 2. The bearing shell 1 is an arc-shaped segmented bearing block, with a friction-reducing and wear-resistant coating on its upper surface and several mounting holes on its bottom plane for installation and mating with the upper end face of the support element 2. The lower end of the support column 4 is fitted into the mounting hole of the support base 7, and its upper end face mates with the bottom plane of the bearing shell 1. The bellows 5 is coaxially fitted onto the outside of the support column 4, with its upper edge sealed to the support column 4 by the sealing ring 6, and its lower edge sealed to the support base 7 by the sealing ring 6. The sealing ring 6 mainly functions to seal the oil 8. The support base 7 is integrally embedded in the concave bearing cavity of the bearing housing 3. The enclosed cavity between the bellows 5 and the support column 4 is filled with high viscosity index hydraulic oil. The bearing seat 3 has several recessed cavities on its upper surface that are adapted to the support base 7. The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A wind turbine main shaft sliding bearing supported by a bellows-oil system, characterized in that, It consists of a bearing shell (1), a support element (2), and a bearing seat (3); the support element (2) consists of a support column (4), a bellows (5), a sealing ring (6), a support base (7), and filling oil. The support element (2) is embedded and fixed in the concave bearing cavity of the bearing seat (3), and the bearing shell (1) is fitted on the top of the support element (2).

2. The wind turbine main shaft sliding bearing supported by a bellows-oil system according to claim 1, characterized in that, In the support element (2), the support column (4), the bellows (5), and the sealing ring (6) form independent support units in a one-to-one correspondence and are distributed on the support base (7) in an array.

3. The wind turbine main shaft sliding bearing supported by a bellows-oil system according to claim 1, characterized in that, The corrugated pipe (5) is coaxially fitted on the outside of the support column (4), and its upper edge is sealed and snapped with the support column (4) through a sealing ring (6), and its lower edge is sealed and connected with the support base (7) through a sealing ring (6).

4. The wind turbine main shaft sliding bearing supported by a bellows-oil system according to claim 1, characterized in that, The upper end face of the support (4) is fitted with the mounting hole on the bottom plane of the bearing (1) for installation.

5. The wind turbine main shaft sliding bearing supported by a bellows-oil system according to claim 1, characterized in that, The enclosed cavity between the bellows (5) and the support (4) is filled with high viscosity index hydraulic oil.

6. The wind turbine main shaft sliding bearing supported by a bellows-oil system according to claim 1, characterized in that, The upper end face of the support base (7) has mounting holes in an array for mounting the support column (4).

7. The wind turbine main shaft sliding bearing supported by a bellows-oil system according to claim 1, characterized in that, The upper surface of the bearing bush (1) is coated with a friction-reducing and wear-resistant coating.

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