ROTOR-TYPE WINDMILL Russian patent published in 2013 - IPC F03D3/02 F03D11/00 

FIELD: power engineering.

SUBSTANCE: windmill comprises an impeller installed on a vertical hollow shaft and made in the form of rotary blades placed between upper and lower rims of rotary blades installed on rotary shafts, which are fixed on brackets connected to a vertical shaft. The vertical shaft is fixed by rolling bearings and is coupled with a power generator. The windmill support is a fixed base. The windmill is equipped with an additional impeller and a support, at the same time the supports are arranged one into another. The vertical shaft is made in the form of two hollow shafts of different length arranged one into another and fixed in the upper part with planetary geared wheels. The outer shaft is made with smaller length and rests against a conical bearing installed above the expanded part of the inner shaft over the external support. The inner shaft is made with larger length, fixed by rolling bearings and rests against the ball step bearing installed on the internal support. The upper impeller is fixed on the upper part of the external shaft, and the lower impeller is fixed on the lower part of the inner shaft.

EFFECT: increased efficiency.