Mechanism for synchronously varying pitch of a multi-blade rotor

摘要

A mechanism for synchronously varying pitch of a multi-blade rotor, such as rotors used in wind or hydraulic generator and helicopter is provided in the present invention. The sync-pitch-varying mechanism for the rotor mainly comprises a bearing a driver, a transmission, a linkage and a control unit, wherein the transmission includes a shaft coupling, a ballscrew, an intermediate cylinder, a driven shaft and a transition cylinder; the linkage includes a link hub, a guide support and multiple links; the control unit includes a speed sensor, a position sensor, a switch and a programmable controller; a rotatory driving force output by said driver through the shaft coupling is transmitted to the driven shaft through a screw-and-nut transmission between the ballscrew and the intermediate cylinder of the transmission so as to drive the driven shaft to move in a linear motion which is then transferred from the driven shaft to the link hub of the linkage through means of the transition cylinder; the controller is configured to enable the driven shaft to move reciprocally within a predefined range of length in order to move the link hub back and forth along the guide support in an axial direction thereof, and therefore multiple bearings for supporting the blades of the rotor are rotatably movable through the multiple links of the link hub. Advantageously, the mechanism of the invention has a simple and compact structure, low cost and high reliability, and the operation is easy to be controlled precisely.

主权项

1. A wind turbine including a generator arranged in a nacelle and a mechanism for synchronously varying pitch of a multi-blade rotor having a rotor hub with multiple blades,
wherein said multiple blades are equal-spaced mounted around said rotor hub through means of corresponding bearing seats, each one of which includes a bearing having an outer ring and an inner ring being rotatably movable with respect to said outer ring, wherein said mechanism includes a driver, a transmission, a linkage, and a control unit; wherein said transmission includes a shaft coupling, a ballscrew, an intermediate cylinder, a driven shaft and a transition cylinder; said linkage includes a link hub, a guide support and multiple links; said control unit includes a speed sensor, a position sensor, a switch and a programmable controller; a rotatory driving force output by said driver through the shaft coupling is transmitted to the driven shaft through a screw-and-nut transmission between the ballscrew and the intermediate cylinder of said transmission so as to drive the driven shaft to move in a linear motion which is then transferred from the driven shaft to the link hub of the linkage through means of the transition cylinder, said driven shaft is connected to the intermediate cylinder through the transition cylinder in a way that allows the driven shaft to be only rotatable but not linearly movable in an axial direction with respect to the intermediate cylinder; said controller is configured to enable the driven shaft to move reciprocally within a predefined range of length in order to move the link hub back and forth along the guide support in an axial direction thereof, and therefore said multiple inner rings are rotatably movable in same angle speed synchronously with respect to said corresponding multiple outer rings of said multiple bearings under the driving of the link hub through the corresponding multiple links.