Perpendicular shaft wind turbine with adjustable windward area

Abstract

The invention provides a perpendicular shaft wind turbine with an adjustable windward area. The perpendicular shaft wind turbine comprises a main shaft and blades and further comprises a scissor fork type mechanism, sliding rails, a rope wheel, a servo taking-up and paying-off motor and ropes, the servo taking-up and paying-off motor is coaxially installed at the top of the main shaft, the scissor fork type mechanism is installed on the main shaft, the rope wheel is fixedly connected with an output shaft of the servo taking-up and paying-off motor, one end of each rope is fixed to the rope wheel, and the two ropes are the same in winding direction. The other ends of the ropes are fixedly connected with blade rotary shafts, one end or the middle of each blade is fixedly connected with the rotation center of the scissor fork type mechanism, the other ends of the blades are matched with the sliding rails, and the blades can move along the sliding rails but can not rotate around the rotary shafts of the blades. The wind turbine is installed by the adoption of a blade fixed pitch, and the radius of a wind wheel is controlled according to wind speeds, so that the pneumatic performance of the perpendicular shaft wind turbine is improved at different wind speeds. Meanwhile, the mechanics properties of the perpendicular shaft wind turbine are improved in a strong wind environment, even braking and shutdown stages can be avoided, and the working range of the wind turbine is greatly enlarged.

Description

technical field [0001] The invention relates to a vertical axis wind turbine, in particular to a vertical axis wind turbine that can automatically adjust the windward area according to the wind speed. Background technique [0002] With the increasing shortage of fossil fuels such as petroleum and the serious environmental pollution, the development of clean and renewable energy has become the focus of research by scholars from all over the world, and vertical axis wind power generation has become a hot technology that has attracted much attention. Starting capability, working range and wind energy utilization are usually the key to inspect the performance of vertical axis wind turbines. At present, combined wind rotor technology is one of the common methods to improve the overall performance of wind turbines. Combined wind turbine adopts resistance type and lift type blades at the same time, and integrates the advantages of resistance type blades with good low-wind starting...

AI Technical Summary

Problems solved by technology

However, the problem of poor aerodynamic characteristics of drag blades at high tip speed ratios greatly affects the aerodynamic performance of lift blades.

Another method is to use pitch control technology to improve the performance of wind turbines, and to improve the overall performance of wind turbines by actively or passively controlling the angle of attack of the blades. However, whether this technology uses mechanical pitch control or servo pitch control, will greatly increase the complexity of the system, and due to the complexity of the flow field of the vertical axis wind turbine, there is no universally applied pitch control law

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