Pump for e.g. liquefied natural gas, has fluid cooling circuit provided for motor and rolling bearing, and supply circuit of axial balancing system independent of cooling circuit

摘要

The pump has a casing plunged into a fluid. A centrifugal wheel (28) is provided on the casing. A coaxial electric motor (16) surmounts the centrifugal wheel. A stator is integral with the casing. A rotor is integral with a shaft (22), which is coupled to the centrifugal wheel. An axial balancing system (60) is defined by a fluid circulation circuit provided between the centrifugal wheel and the casing. A fluid cooling circuit (90) is provided for the motor and a rolling bearing. A supply circuit of the axial balancing system is independent of the cooling circuit.