Variable pre-taper angle device for wind wheel of wind turbine generator and use method

Abstract

The invention provides a variable pre-taper angle device for a wind wheel of a wind turbine generator and a using method. The variable pre-taper angle device comprises a connecting seat, a hub, blade roots and blades; the hub is installed outside the connecting seat, a blade root connecting section is connected to the hub, the blade roots are connected to the blade root connecting section, and the blades are connected to the blade roots; three convex columns are uniformly distributed on the connecting seat; a gear ring is arranged at the top of each convex column, a fixing groove is formed in the inner wall of each gear ring, and variable pitch bearings are installed in the gear rings through the fixing grooves; the blade roots are fixed to the variable pitch bearings; slots are formed in the blade roots, fixing plates are installed in the slots, the fixing plates are connected with motor bases located on the outer side of the slots, and motors are installed on the motor bases; and an output shaft of each motor is connected with a tooth roller, and the tooth rollers mesh with the gear rings. When the wind speed is small, the cone angle of the blades can be reduced, the wind sweeping area is increased, and the productivity efficiency is improved; and when the wind speed is large or the blade deformation is large, the blade taper angle is increased, and the blades are prevented from damaging equipment and colliding with a tower due to deformation.

Description

technical field [0001] The invention belongs to the field of horizontal-axis wind turbine equipment, and in particular relates to a variable pre-cone angle device and a use method of a wind wheel of a wind turbine. Background technique [0002] Energy is the main material basis of social economy and human life, and the driving force of social development. However, the reserves of non-renewable energy such as petroleum, coal, and natural gas, which are the main pillars of world energy, are decreasing day by day. Many countries in the world are developing wind power generation. As a new energy source, wind power generation has formed a relatively mature scale. [0003] The wind wheel is one of the most important components for absorbing wind energy. When the wind flows through the blade, the surface of the blade disturbs the flow, forming torque and thrust, and the blade deforms accordingly. When the wind speed changes, the torque changes, and the blade clearance also changes...

AI Technical Summary

Problems solved by technology

Because the pre-cone angle of the wind rotor of the conventional wind turbine is fixed, when the large-scale development of the wind turbine, the deformation of the long flexible blade tip of the large-scale wind turbine can reach 7-8 meters, if the design is too small to meet the clearance requirements, it will cause blade deformation and tower If the design is too large, it will affect the effective sweeping area of ​​the wind rotor and reduce the power generation

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