Patent ID: 8322985

Claim:
A wind turbine generator, comprising: a driving and generating mechanism accommodated in a nacelle, which is connected to a rotor head equipped with wind turbine blades; devices disposed inside the rotor head and including a blowing unit positioned inside the nacelle for regulating a temperature in the rotor head and regulating temperature of fluid in the nacelle; and, a rotary joint interposed in a driving shaft system that joins the rotor head and the nacelle; and a main shaft for transmitting rotation of the rotor head; wherein the rotary joint includes a fixed-side main body fixed to and supported by a side of the nacelle and a rotating-side main body joined to a side of the rotor head, and the fluid for regulating the temperature in the rotor head is supplied from the interior of the nacelle into the rotor head and flows in a first temperature regulation fluid supply pipe joined to the fixed-side main body to a second temperature regulation fluid supply pipe passing through the rotating-side main body, inside the rotary joint, and the second temperature regulation fluid supply pipe passes through the main shaft.