Device for converting the kinetic energy of waves, water flows or wind into mechanical energy

A device for converting kinetic energy from a fluid flow of waves or water currents into mechanical energy of rotation, said device comprising a plurality of cross flow turbines, each one comprising fixed curved blades arranged about an axis of rotation to define a cylindrical turbine area having an open interior through which water may pass, wherein the turbines are mounted on a floating support on the water, such that the turbines can be directly placed in the fluid flow, and arranged successively one after another with their axes parallel to each other and perpendicular to the fluid flow, wherein the floating support has a U-cross section profile that forms a channel, such that a bottom hull and two side hulls are defined, the axes of the turbines being rotatably supported between the two side hulls, and wherein the floating support comprises a floating control apparatus including floodable floats so that the device is movable between a lower operative position in which the turbines are completely sunk and an upper position in which the turbines are arranged completely above the water level.