BEARING ARRANGEMENT FOR A TURBINE ROTOR OF A DRILL STRING TURBINE

摘要

The invention is directed to a bearing arrangement for a turbine rotor (10) of a turbine (3) adapted to be mounted in a drill string (2) and to be driven by the flow of drilling fluid, comprising a turbine chamber (11) surrounding the turbine rotor (10) and having an inflow (7) and an outflow (8), a stator (12, 15) on which the turbine rotor (10) is rotatably mounted, and a cavity (32) formed between the turbine rotor (10) and the stator (12, 15) and accommodating at least one radial plain bearing (16, 17) and being separated from the turbine chamber (11) by an axial plain bearing (18) constructed as a bearing ring seal and by a conveyor screw (22) which is disposed on the turbine rotor (10) and operates to convey from the cavity (32) to the turbine chamber (11).