Single-Frame Impeller with Adjustable Blade Pitch for Wind Turbines
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Solution Overview
Problem
Conventional wind turbine generator sets face issues such as increased size, vibration, fracture probability, limited wind speed range, high maintenance costs, and reduced efficiency due to their three-blade design, which also limits the adjustable range of blades and increases the risk of damage from lightning.
Innovation Solution
A single-frame impeller design with a horizontally arranged main shaft, oblique supporting rods, and a blade adjusting device that includes a gear combined-type or connecting-rod-type adjusting mechanism, allowing for adjustable blade angles, improved structural strength, and reduced weight, enabling efficient wind energy utilization across varying wind speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the length of each blade is increased to increase rated output power, then the wind-swept area and power of the fan are increased, but the overall size and height of the fan are increased, and the vibration degree and fracture probability are increased
Solution Approach 1:
The patent implements adjustable blade pitch angles that allow the blades to dynamically adapt to different wind conditions. By adjusting the pitch angle, the effective wind-swept area and aerodynamic characteristics can be optimized without permanently increasing blade length, thereby maintaining power output while reducing vibration and fracture risk under extreme conditions
Solution Approach 2:
The patent changes the operational parameters of the blades by allowing pitch angle adjustment during operation. This enables the same blade structure to achieve different power outputs and wind resistance characteristics, effectively increasing rated power capability without permanently increasing blade dimensions and associated structural risks
2Power
If the angle of each blade is adjusted asynchronously, then the power output can be optimized, but the production, operation and daily maintenance cost are increased
Solution Approach 1:
The patent merges the pitch adjustment mechanisms for multiple blades into a synchronized system controlled by a single actuator through a gear mechanism. This combining approach maintains the ability to optimize power output through pitch adjustment while significantly reducing the complexity, production cost, and maintenance requirements compared to fully asynchronous independent adjustment of each blade
3Strength
If a multi-frame structure with supporting rods is used, then the structural strength is improved, but the weight of the whole fan head portion is increased
Solution Approach 1:
The patent extracts and eliminates the complex multi-frame structure with multiple supporting rods from the fan head design. By removing this heavy structural framework, the patent achieves significant weight reduction while maintaining sufficient structural strength through the simplified single-frame design and optimized blade mounting structure
4Adaptability or versatility
If steel cable and frame groove adjustment mechanism is used, then the blade angle can be adjusted, but the structure is complicated and the frictional loss is relatively large
Solution Approach 1:
The patent replaces the complex steel cable and groove mechanical system with a more efficient gear-based mechanical transmission system. This substitution maintains the blade angle adjustment capability while significantly reducing structural complexity and minimizing frictional losses through the direct gear engagement mechanism
Data Source
AI summary
The present invention provides a single-frame impeller of a wind turbine generator set. The impeller includes blades and a blade adjusting device. The blade adjusting device comprises a blade adjusting chamber to which the blades are connected, a motor and an adjusting mechanism. The adjusting mechanism comprises transmission mechanism, adjusting frame, rotating arm and connecting rods. Transmission mechanism comprises swinging arm, a positioning shaft, a main drive arm and a push-pull rod. The adjusting frame is assembled onto blade adjusting chamber; the rotating arms are fixed on the blade shafts and the connecting rods, and the other end of each connecting rod is hinged with the adjusting frame; two ends of the positioning shaft are installed on the fixed seat; swinging arm is fixed at positioning shaft and is hinged with main drive arm, and the main drive arm is connected with the motor.