MARINE PROPULSIVE DEVICE COMPRISING CONCENTRIC AND CONTRA-ROTATING PROPELLERS AND SHIPS EQUIPPED WITH SUCH DEVICE

摘要

propulsion system for ships (1), comprising two blades (5, 6) are concentric and contra rotating, rotating at the same speed but in opposite directions, not reversed, the screws (5, 6) are driven by two drive shafts (3, 4), either of two heat engines (21, 22), one of which is in the opposite direction to the other, each with a drive shaft.an engine camshaft or (2) with two drive shafts (3, 4), concentric, rotating at the same speed but in the opposite direction, to remove the drive torque of the vessel (1) around the axis of the screws (5, 6), a propeller (couples 5 and 6) is zero as well as those of the two engines.it is characterized in that the propeller concentrically and contra rotating (5, 6) are placed in the interior of a cylindrical body to prevent cavitation and the formation of vortices generated by the impeller.and which is arranged in such a way that the bottom wall of the outlet (7) is a thrust reverser outlet for closing and opening two or cup to reverse the direction of water flow, and establish the reverser.