Dual Temperature Oil Control for Wind Turbine Gearbox
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Solution Overview
Problem
Multi-stage wind turbine gearboxes face inefficiencies due to a single common oil temperature supply, which fails to optimize oil viscosity for each stage, leading to suboptimal performance and increased wear on gearbox components.
Innovation Solution
A system that supplies oil at different temperatures to various locations within the gearbox by using a common oil sump and pump with temperature control devices, such as mixing valves, to tailor oil temperatures for specific gear stages, optimizing oil viscosity and film thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a common lubrication system supplies oil at a single temperature to all gearbox stages, then the system complexity is reduced, but the oil viscosity cannot be optimized for each specific gear stage
Solution Approach 1:
The common lubrication system is segmented into multiple independent temperature control zones, with each gear stage receiving oil at its optimal temperature through separate control valves and temperature sensors, allowing customized temperature optimization for each stage without requiring completely separate lubrication systems
Solution Approach 2:
Each gear stage is provided with locally optimized oil temperature control through individual temperature control valves and sensors positioned at each stage, enabling the oil properties to be tailored to the specific requirements of each gear mesh and bearing location
2Reliability
If a single oil temperature is used for all gearbox stages, then the system design is simplified, but component wear increases due to suboptimal oil viscosity
Solution Approach 1:
Temperature sensors are installed at each gear stage to provide real-time feedback on oil temperature, which is then used by control valves to adjust the mixing ratio of hot and cold oil streams, ensuring each stage receives oil at its optimal temperature for maximum reliability and minimum wear
Solution Approach 2:
Temperature control valves act as intermediaries between the common oil supply system and individual gear stages, mixing hot and cold oil streams to achieve precise temperature control at each stage without requiring separate oil reservoirs or pumps for each stage
3Adaptability or versatility
If mixing valves are used to control oil temperature at different stages, then oil viscosity is optimized for each stage, but the control system complexity increases
Solution Approach 1:
The temperature control system is designed to be largely self-regulating, with control valves that automatically adjust the mixing ratio of hot and cold oil based on temperature sensor feedback, eliminating the need for manual intervention or complex external control systems while maintaining optimal viscosity at each stage
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the reliability and performance of higher speed stages, reduces scuffing risks, and extends gearbox life by matching desired viscosities and film thicknesses across different gear stages without significantly increasing system complexity or cost.
Implementation Method 1
The oil is then cooled in a heat exchanger (cooler) to reduce the temperature of the oil to a desired gearbox oil inlet temperature
Implementation Method 2
mixing valves are configured to independently control the inlet oil temperature to the respective groups within the wind turbine gearbox
Data Source
AI summary
A system and method are provided for supplying oil at different temperatures to different locations within a wind turbine gearbox, wherein oil is pumped from a common oil sump to the different locations via a common header. The different gear box locations are divided into at least two groups, wherein each of said groups receives inlet oil at a respective inlet oil temperature. A first temperature control device is disposed between the common header and the first group, and a second temperature control device is disposed between the common header and the second group of gearbox locations.