Patent ID: 8376711

Claim:
A dual rotor wind turbine comprising: a column; and a generating unit comprising: a vertical shaft rotatably mounted to the column, a main frame mounted to the vertical shaft, a rotor assembly horizontally placed in each side of the vertical shaft and rotatably mounted to the main frame, an inlet guide vane mounted to the main frame and placed at a lower location in front of the rotor assembly, an upper guide vane mounted to the main frame, a tail wing connected to the main frame, and a generator connected to the rotor assembly, wherein the rotor assembly comprises: a horizontal rotor shaft, a rotor frame radially and circumferentially mounted to each end of the rotor shaft, and a rotor blade mounted to the rotor frame at a location close to an outside end of the rotor frame, and the rotor shaft is placed in back of the vertical shaft such that the rotor shaft is offset from the vertical shaft, the vertical shaft comprises flanges at upper and lower ends thereof, a first installation ring is provided in the upper end of the vertical shaft and comprises a flange part mounted to one of the flanges of the vertical shaft, a cylindrical part inserted into the vertical shaft, and an inner ring part protruding inwards from a lower end of the cylindrical part, an inner circumferential surface of the cylindrical part comprises a bearing seat groove for seating a bearing therein, an inner circumferential surface of the inner ring part comprises a seal ring seat groove for seating a seal ring (S) therein, a second installation ring is provided in the upper end of the vertical shaft and comprises a flange part mounted to the flange part of the first installation ring, and an insert part inserted into the cylindrical part of the first installation ring, and a lower surface of the insert part comprises a bearing seat groove for seating a bearing therein and an inner circumferential surface of the insert part is provided with a seal ring seat groove for seating another seal ring (S) therein.