Pitch angle adjusting mechanism for blades of vertical axis wind generator and vertical axis wind generator

Abstract

The invention discloses a pitch angle adjusting mechanism for blades of a vertical axis wind generator, comprising blades which are distributed in the same circle, wherein the blades are vertically placed, and both the upper and lower ends of each blade are covered with a blade hoop, respectively; the back of the hoop is provided with two horizontal support lugs that are parallel to each other inthe vertical direction; and the inner side of the circle where the blades are located is provided with a power assembly, a vertical tube assembly, an execution assembly, a generator hub shell and a drive bevel gear. The pitch angle adjusting mechanism of the invention can adjust the pitch angle of the blades depending on the requirements; moreover it can adjust the pitch angles of all the blades at the same time which overcomes the shortage of traditional structures which cannot adjust the pitch angles of the blades. The pitch angle adjusting mechanism of the invention can better protect the blades when the wind generator stops, increase the output power of the wind generator, and substantially stabilize the output power of the wind generator to its nominal power so as to avoid large impact to the power grid. Additionally, the pitch angle adjusting mechanism of the invention is simple in structure and convenient in preparation, has favorable technological and economical values, and issuitable to be widely generalized and used in the field of vertical axis wind generator.

Description

technical field [0001] The invention belongs to the field of vertical axis wind power generators, and in particular relates to a pitch angle adjustment mechanism for vertical axis wind power generator blades and a vertical axis wind power generator. Background technique [0002] Such as figure 2 As shown, the pitch angle θ of the blade of the vertical axis wind turbine is the angle between the direction of the circumferential velocity of the blade and the direction of the chord. At present, the pitch angle of the blade has been set at the time of design and cannot be adjusted. And the set pitch angle is closely related to factors such as start-up wind speed, rated wind speed, cut-out wind speed and rated power of the wind turbine. At the same time, the pitch angle represents the wind energy utilization rate of the blades, the larger the pitch angle, the lower the wind energy utilization rate, and under the same wind speed, the larger the pitch angle, the higher the output p...

AI Technical Summary

Problems solved by technology

[0005] When the rated wind speed < actual wind speed < cut-out wind speed, it is necessary to adjust the pitch angle according to the actual wind speed, so that the output power of the wind turbine can be stabilized near the rated power, but the existing structure cannot achieve this, resulting in the output of the wind turbine The deviation between the power and its rated power is large, which will have a large impact on the power grid;

[0006] When the actual wind speed > cut-out wind speed, the wind turbine is forced to stop. In order to protect the blades, it is necessary to increase the pitch angle, generally to 90°, but the existing structure is still unable to achieve

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