Double-feedback fan blade hub axial extension device and double-feedback fan thereof

Abstract

The invention discloses a double-feedback fan blade hub axial extension device and a double-feedback fan thereof. The axial extension device comprises a hub shaft, an extension mechanism, a shaft sleeve, a wind speed sensor, a controller and an output shaft; one end of the hub shaft is connected with fan blades, and the other end is connected with the extension mechanism; the other end of the extension mechanism is connected with one end of the output shaft; the other end of the output shaft is connected with a gear box of the fan; the hub shaft is inserted in one end of the shaft sleeve in anextension manner, and is synchronously rotated with the shaft sleeve; the other end of the shaft sleeve is fixedly connected with the output shaft; the wind speed sensor is connected with the controller; and the controller controls the extension mechanism to drive the hub shaft to move front and back. The mass center position of a power generation module on a fan tower can be adjusted in real time according to external wind speed of the fan, so that the mass center of the power generation module is always kept on the central axis of the tower, and the operation safety and the service life ofthe fan are improved.

Description

Technical field [0001] The invention relates to the technical field of large double-fed fans, in particular to a double-fed fan blade hub axial expansion device and the double-fed fan. Background technique [0002] At present, in order to develop more powerful wind turbines, it is necessary to enlarge the wind turbine blades and increase the height of the wind turbine tower. The increase in the length of the wind turbine blade will not only lead to a substantial increase in the weight of the blade, but also a sharp increase in the horizontal load on the top of the tower when the wind turbine is running; at the same time, the increase in the height of the wind turbine tower will increase the flexibility of the tower. The superposition of the above factors reduces the ability of large-scale doubly-fed wind turbines to resist hurricanes, and it is prone to accidents of wind turbines falling down, causing hidden danger to the safe operation of wind turbines. [0003] The structure of ...

AI Technical Summary

Problems solved by technology

When the fan is working, the hub shaft 1 is subjected to the axial thrust from the fan blade 6, and the top of the tower 21 will generate a horizontal displacement along the wind direction (such as Figure 5 shown), since the position of the center of mass of the power generation component is not adjustable, the center of mass of the power generation component at the top of the tower 21 will deviate from the central axis of the tower 21 (when the wind speed reaches 25 m / s, the deviation of the center of mass of the large wind turbine will reach 1000mm), since the power generation components weigh more than 200 tons, a large breaking moment is formed on the bottom of the tower 21, which may easily cause the tower 21 of the wind turbine to become unstable, resulting in accelerated failure of the supporting connection structure or other components on the wind turbine. It even caused the collapse of tower 21

Images