Pitch-variable mechanism of vertical axis wind turbine

Abstract

The invention discloses a pitch-variable mechanism of a vertical axis wind turbine, which comprises a servomotor and a closed box body, wherein a parallelogram mechanism consisting of a driving crank, four transmission cranks and a rotating disk playing the role of a 'connecting rod', and four sets of synchronous belt assemblies are mounted in the closed box body; the servomotor is in key connection with an overhang shaft head, on one side of the closed box body, of the driving crank; four driving wheels are fixedly mounted at an overhang shaft head, on the other side of the closed box body, of the driving crank respectively, and form a 'soft transmission' mechanism together with pitch-variable wheels fixedly arranged on blades through synchronous belts; the closed box body is fixed on the outer rotor of a generator through bolts; and an encoder used for feedback information such as rotational speed and rotor angle of the servomotor is installed at the tail part of the servomotor. The invention has the benefits that the pitch-variable mechanism capable of active control can actively follow the direction of the wind and adjust the pitch angle of the blades constantly, and the aerodynamic performance and the start capacity of the vertical axis wind turbine are further improved.

Description

technical field [0001] A pitch variable mechanism for a vertical axis wind turbine can actively follow the wind direction and improve the starting performance of the wind turbine through variable pitch. It belongs to the field of vertical axis wind power generation. Background technique [0002] Wind power technology has become an effective means to solve energy shortages, environment and climate change on a global scale, and plays a major role in the development and utilization of new energy. Straight blade vertical axis wind turbines occupy the small and medium-sized wind power market by virtue of their simple structure, easy installation and maintenance, and simple blade processing and manufacturing. However, the poor start-up performance of traditional straight-blade vertical-axis wind turbines has become one of the main obstacles restricting the development of straight-blade vertical-axis wind turbines. Scholars at home and abroad have conducted in-depth research on th...

AI Technical Summary

Problems solved by technology

However, the research in the book "Principles and Applications of Wind Turbines" (Zhao Zhenzhou China Water Conservancy and Hydropower Publishing House) shows that: combined wind rotors of H-type and S-type, or φ-type and S-type are only unified in form. The aerodynamic performance is improved at low tip speed ratios, but the performance at high tip speed ratios is worse than that of single-lift blades

It can be seen that the combined wind rotor structure improves the start-up performance at the expense of the overall power generation of the wind turbine, and the structural form of the combined wind rotor remains to be studied

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