Patent ID: 8496433
Filing Date: 2013-07-30
Classification: F03D,Y02E

Abstract:
1. A wind mill structure of a lift-type vertical axis wind turbine comprising a vertical shaft, a plurality of blades, each blade having an airfoil profile and being connected to the vertical shaft, pairs of supporting arms, each pair having a fixed supporting arm and a rotatable supporting arm for holding each blade to the vertical shaft, each fixed supporting arm at one end connected to the vertical shaft and at the other end to one end of the corresponding rotatable supporting arm, and the other end of the corresponding rotatable supporting arm connected to the blade, a pivot disposed on a connecting part of the fixed supporting arm and the corresponding rotatable supporting arm, a plurality of controlling devices, each controlling device corresponding to a pair of the supporting arms and a blade, and each controlling device connecting with one end of the rotatable supporting arm and one end of a neighboring fixed supporting arm and controlling an angle where the rotatable supporting arm rotates around the pivot, and a plurality of length-adjustable tension devices, each length-adjustable tension device at one end being attached to the corresponding controlling device and at the other end being attached to the neighboring fixed supporting arm, wherein the controlling device is a flexible component, a hydraulic unit, an electronic component, or a mixture thereof; a setting angle α between a chord of the blade and a tangent line that goes through the center of the blade at a position in a circumference during rotation of the blades ranges from −12° to 12°; and an angle G between the chord of the blades and the corresponding rotatable supporting arms ranges from 7° to 100°.