PRESSURE STAGE OF TURBINE OF TURBO-DRILL Russian patent published in 2001 - IPC

FIELD: manufacture of turbines for turbo-drills intended for deep drilling. SUBSTANCE: pressure stage of turbine of turbo-drill includes stator hub, stator blade ring pressed into it and including internal rim. Chord of blades of stator ring is inclined towards plane perpendicular to axis of pressure stage of turbine at angle not exceeding 50 degrees. Internal surface of larger diameter of stator blade ring is rounded by radius R whose center is located on side of axis of pressure stage of turbine. Hub of rotor with rotor blade ring pressed on it is freely put into hub of stator. Chord of blade of rotor ring in this case is inclined towards plane perpendicular to axis of pressure stage of turbine at angle not less than 70 degrees. Blades of rotor ring have guaranteed clearance Z relative to hub of stator lying in range of values from 0.1 to 0.2 of radial height h₃ of blades of rotor ring. EFFECT: prolonged operational life of axial bearings of turbo-drill, prolonged overhaul period of turbo-drill as whole. 4 cl, 3 dwg