A choke brake blade for a vertical axis wind turbine

Abstract

The invention discloses a flow choking braking blade for a vertical axis wind turbine. The braking blade comprises a frame and skin for wrapping the frame, and is characterized in that an openable / closable movable flow choking fan is arranged on a blade, wherein one side edge of the movable flow choking fan is hinged to the frame of the blade; and the movable flow choking fan is connected with a control device. The blade is provided with the openable / closable movable flow choking fan. When the wind turbine runs at normal wind speed, the movable flow choking fan is in a closed state; and when the wind speed is excessively high, and is required to be decreased in a braking way, the control device is used for opening the movable flow choking fan, the structural shape of the blade is changed, the choking surface of the blade is enlarged, and air flow is disturbed, so that an auxiliary braking function is realized. In addition, a spoiler is arranged on the tail part of the blade, and can be automatically folded according to the wind speed, and when the wind speed is higher, the spoiler is folded, the chord length of the blade is decreased, and the windward surface of the blade is reduced, so that the auxiliary braking function can also be realized; and due to the arrangement of the spoiler, the rotating speed of the wind turbine can be favorably and automatically controlled within a relatively stable range.

Description

technical field [0001] The invention relates to a wind power generation device, in particular to a blade with a flow blocking braking function for an H-shaped vertical axis wind power generator, and belongs to the technical field of wind power generation. Background technique [0002] With the increasing pressure on energy and the environment, more and more attention has been paid to clean and renewable new energy. Among all kinds of green energy, wind energy is one of the renewable energy sources with great potential, and its application is becoming more and more extensive. Wind turbines are divided into horizontal axis and vertical axis according to the installation orientation of the main shaft. In recent years, the technology of vertical axis generators has developed rapidly. Even at low wind speeds, it can still start and run normally, without yaw and pitch changing devices, so the structure is relatively simple. The rotating main shaft of the H-type vertical shaft ge...

AI Technical Summary

Problems solved by technology

Small vertical axis wind turbines usually control the speed through disc brakes, but it is very difficult to control the speed of large vertical axis wind turbines, especially when the wind speed is high and changes greatly, only relying on the electromagnetic force of the disc brakes The resistance is difficult to meet the braking requirements, and this problem has become a bottleneck restricting the development of large-scale vertical axis wind turbines

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