Variable-wing vertical axis resistance type wind turbine

Abstract

The invention relates to a variable-wing vertical axis resistance type wind turbine comprising blades, pendulum bars, pendulum bar pins, connecting rods, pins, a rack cylinder, a top cover, an output shaft and limit stops. A set of four-bar linkage is formed by two pendulum bars, the connecting rods and the rack cylinder; the outer end of each pendulum bar is fixedly connected with a wind blade; the rack cylinder is provided with eight sets of blades vertically and each set of blades are uniformly staggered; When the wind blows to the blade, the blades at the windward side on the rack cylinder are rotationally unfolded about a rotation axis formed by the blades and the rack cylinder under the effect of wind power, in a similar way, the blades at leeward side are rotationally folded, the two pendulum bars help each other to move under the linkage effect of the connecting rods; the unfolding and folding angles of the blades are limited by the limit stops. During the rotation of the rack cylinder, the wind blades automatically adjust the attitude as the wind angle changes to increase the windward area of the windward side blades and reduce the leeward area of the leeward side blades, therefore, the resistance of the leeward blades is effectively reduced and the wind energy utilization rate of a wind turbine is increased.

Description

technical field [0001] The invention relates to the field of vertical axis wind turbines, in particular to a variable wing vertical axis resistance type wind turbine. Background technique [0002] According to the working principle of wind turbine blades, vertical axis wind turbines can be divided into two types: lift type and drag type. The lift-type wind turbine is a wind turbine that relies on lift to work. Although it has a high utilization rate of wind energy, its starting wind speed is high. Wind turbines that rely on resistance to work have a low wind energy utilization rate, but their start-up wind speed is small, so they are suitable for use in areas with low wind energy resources such as the south. They can generate electricity in light wind conditions and have a broad market. [0003] The main reason for the low utilization rate of wind energy of traditional vertical axis resistance wind turbines is that when the incoming flow hits the wind rotor, the effective t...

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Problems solved by technology

[0004] Technical problem: Aiming at the common problem of low utilization rate of wind energy in vertical axis drag wind turbines, the present invention designs a variable-wing wind turbine. When the wind blows to the blades, the blades on the windward side will be pushed The pendulum rotates around its shaft to expand, and similarly the blade on the leeward side rotates and shrinks. The movement of the two pendulums assists each other under the linkage action of the connecting rod, which greatly reduces the resistance torque that hinders the wind wheel from rotating and doing work, thereby increasing the wind force. Utilization rate of wind energy

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