Patent ID: 8360713

Claim:
A vertical axis turbine machine for converting fluid energy into rotational force and comprising; a housing defining a side wall and top and bottom walls; at least one turbine rotor in said housing said rotor comprising; two spiral turbine rotor blade sets, namely an upper spiral blade set and a lower spiral blade set, mounted on a common vertical axis and said turbine rotor defining upper and lower ends; wherein the upper spiral blade set twists in one direction and wherein the lower spiral blade set twists in the opposite direction, the upper and lower spiral blade sets meeting at a centre point of the turbine rotor midway between said upper and lower ends of said turbine rotor; a plurality of impeller vanes mounted radially around said turbine rotor; inlet openings in said housing side wall; at least one set of fluid guides guiding incoming fluid onto said impeller vanes and said turbine rotor, the fluid flow then flowing upwardly and downwardly around respective upper and lower blade sets; and, a top, fluid flow outlet duct on said top wall and a bottom fluid flow outlet duct on said bottom wall at respective upper and lower ends of the turbine rotor said outlet ducts registering with respective upper and lower blade sets of said turbine rotor for receiving upward and downward fluid flow exiting from respective upper and lower spiral blade sets of said turbine rotor.