HYDRAULIC ENGINES WITH AT LEAST TWO COUNTERROTATING RUNNERS

摘要

A hydraulic turbine or pump without entry or exit guide vanes supported by a cantilevered stationary tube having a pair of concentric counterrotating first and second shafts with an exit section inclined at an angle relative to the axis of the shafts. A first runner is mounted to the first shaft, including at least a pair of radially extending first blades. A second runner is mounted to the second shaft and adapted for counterrotation relative to the first runner. The second runner has at least a pair of radially extending second blades. The pitch of the first and second runner blades is equal or different but inversed, where the runners have opposite, either equal or different, rotating speeds. A Y shaped tube housing encloses the turbine or pump to allow a withdrawal of the complete turbine or pump for inspection or maintenance.