Patent ID: 6250896
Filing Date: 2001-06-26
Classification: F04D,F25J

Abstract:
Pump (1) for a cyrogenic liquid (3) comprising:a hydraulic motor (9) with a motor inlet for receipt of a motor liquid (15) under pressure and a driving wheel (13) driven by the motor liquid (15) and mounted on a shaft (27);a pumping wheel (21) mounted commonly with the hydraulic motor on the shaft for pumping the cryogenic liquid (3);a relative sealing means (33) preventing contamination of the cryogenic liquid (3) by transfer of the motor liquid (15) from the hydraulic motor to the pumping wheel, the relative sealing means (33) including a labyrinth seal (35) arranged around the shaft (27) between the driving wheel (13) and the pumping wheel (21); anda thermally insulated compartment (2) containing means for transporting the cryogenic liquid (3) to and from the pump compartment and containing the hydraulic motor, the pumping wheel, and the relative sealing means,wherein the motor liquid (15) has a density in excess of 400 kg/M.sup.3.