TURBINE PRESSURE STAGE OF TURBODRILL Russian patent published in 2003 - IPC

FIELD: equipment for turbodrilling of oil and gas wells. SUBSTANCE: turbodrill turbine pressure stage consists of stator pressure stage hub and stator blade ring having internal rim, rotor pressure stage consisting of hub and rotor blade ring having external rim, radii centers conjugating undercut-outlet edges of blades on surface external back side of their profiles with minimal sizes of radii outlining on external-back size of zone of maximum thickness of blade profiles of stator and rotor blade rings and located on or below line determining undercut of outlet edges. EFFECT: reduced labour input of turbine manufacture and higher turbine operate reliability. 3 dwg