Mitsubishi Heavy Industries Limited

Atsushi Imanaga

Yoshihiro Fujioka

Tomohiro Numajiri

There is provided a method for hoisting and lowering a device in a rotor head of a wind turbine generator, that can easily perform a device hoisting and lowering operation in the rotor head without an external crane. The method for hoisting and lowering a device in a rotor head includes a step of mounting a temporary winch rail to a rail support portion previously provided in the rotor head, a step of installing a temporary winch on the temporary winch rail, a step of opening a maintenance hatch provided in the rotor head, and a step of hoisting and lowering a replacement device to be attached or removed in the rotor head through a hoisting and lowering opening in the maintenance hatch by the temporary winch.

Method for hoisting and lowering device in rotor head of wind turbine generator

There is provided a wind turbine generator that includes an improved grease supply and discharge system of lubricant oil used in a blade rotating ring bearing of a wind turbine blade, and can reliably recover discharged grease. The wind turbine generator includes a pitch control mechanism that can adjust a pitch angle of the wind turbine blade via the blade rotating ring bearing provided between the wind turbine blade and a rotor head, a grease supply and discharge device is provided in the rotor head, and the grease supply and discharge device includes a grease supply device that pumps lubricant oil in a supplied grease tank with a grease supply pump and supplies the lubricant oil to the blade rotating ring bearing, and a grease discharge device that forcibly sucks and recovers the discharged grease from the blade rotating ring bearing.

Wind turbine generator

The present invention provides a wind turbine generator in which an oil seal structure provided in a blade rotating ring bearing of a wind turbine blade is improved and leakage of lubricant oil to outside is prevented or suppressed. A wind turbine generator in which a rotor head has wind turbine blades, the rotor head rotates when the wind turbine blades receive wind power and drives a power generator disposed in a nacelle to generate electricity, the nacelle is disposed on an upper end of a tower that stands on a foundation such that the nacelle can yaw-slew, a blade rotating ring bearing is disposed between the wind turbine blade and the rotor, the wind turbine generator includes a pitch control mechanism that can adjust a pitch angle of the wind turbine blades, wherein seal mechanisms are mounted on both ends of opposed rolling body holding surfaces of an outer race and an inner race of the blade rotating ring bearing with rolling bodies interposed between both the ends, sides of the seal mechanisms closer to the blade are formed into a double sealed structure in which a space is disposed between seal members and the seal member are disposed in an axial direction of the blade, pressurized fluid is supplied to the space, and lips of the seal members are pushed against a mating sidewall surface.

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Nagasaki, Japan

Atsushi Imanaga