Wind Turbine Main Shaft Sealing With Flexible Labyrinth Retainer
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Solution Overview
Problem
Existing main shaft bearing sealing systems in wind turbines fail to effectively prevent lubricating medium leakage and circulation, especially with increased eccentricity/runout, leading to reduced service life and operational instability.
Innovation Solution
A sealing system comprising an end cover, annular support, dust-proof and oil seals, flexible oil retainers, and oil guide holes, forming a labyrinth structure to prevent oil leakage and facilitate recycling, with components designed for ease of installation and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional sealing system is used, then the structure is simple, but the sealing performance is insufficient and cannot prevent lubricating medium leakage
Solution Approach 1:
The sealing system is divided into multiple functional components: dust-proof seal, oil seal, flexible oil retainer, and oil guide hole. Each component performs a specific sealing function, creating a multi-layered sealing approach that addresses the insufficiency of traditional single-structure seals while maintaining manageable complexity through modular design
Solution Approach 2:
The sealing components are nested within each other: the dust-proof seal is positioned at the outermost layer, followed by the oil seal, and the flexible oil retainer is positioned inside the oil chamber. This nested arrangement maximizes sealing effectiveness within the available space without requiring excessive structural complexity
2Adaptability or versatility
If the eccentricity/runout of wind turbines increases, then the adaptability to different operating conditions improves, but the traditional sealing system cannot achieve effective sealing
Solution Approach 1:
The flexible oil retainer is made of flexible material that can dynamically adapt to the changing positions and eccentricity of the main shaft during operation. This flexibility allows the sealing system to maintain effective sealing under varying operating conditions including increased eccentricity and runout, while the system structure remains manageable
Solution Approach 2:
The flexible oil retainer changes its physical state and position in response to parameter changes in the operating conditions (eccentricity, runout, vibration). This dynamic parameter adaptation allows the sealing system to maintain effectiveness across a range of operating conditions without requiring a completely different sealing structure
3Reliability
If multiple sealing components are added to improve sealing performance, then the sealing effectiveness improves, but the installation and maintenance difficulty increases
Solution Approach 1:
The sealing system is segmented into independently replaceable components. If one sealing component fails or wears, only that specific component needs to be replaced rather than the entire sealing system, thereby maintaining ease of repair while achieving improved sealing effectiveness through multiple components
Solution Approach 2:
The flexible oil retainer is designed to be extractable from the oil chamber for replacement. The oil guide hole and sealing components are positioned to allow access for installation and maintenance, reducing the complexity of servicing multiple sealing components compared to integrated designs
Data Source
AI summary
A sealing system is disclosed. An oil chamber is formed between an annular support and a main shaft. One side of the oil chamber can be sealed by using a dust-proof seal, to achieve dust-proof and waterproof effects at this side. The oil seal can be functioned to seal a bearing side. After a flexible oil retainer is mounted onto a main shaft through a limiting structure, a labyrinth can be formed in the oil chamber, thereby effectively improving the ability to prevent the oil from flowing out. Additionally, an oil guide hole can be used to recycle the oil, to avoid oil accumulation. Meanwhile, the flexible oil retainer is made of a flexible material, which can avoid damages to components of the labyrinth system during installation and operation of a wind turbine. Moreover, the flexible oil retainer is in a flexible design, and easy to mount and maintain.