Pump for very cold liquids

Details Pump for very cold liquids Pump for very cold liquids

1982-06-28

1983-12-06

Capossela, Ronald C.

Refrigeration

Low pressure cold trap process and apparatus

417901, F17C 1300

Patent

active

044185448

ABSTRACT:
A pump for cryogenic liquids is provided with an enclosing vessel of the construction of a Dewar flask. A submerged multistage rotary pump is suspended from the mouth of the flask by means of a system providing thermal insulation opposing the flow of heat down the neck of the flask. The drive motor is coupled to the drive shaft of the immersion pump through a magnet coupling of which the elements are separated by a pressure seal. The latter and the extensive thermal insulation make the pump suitable for pumping liquid air or liquid nitrogen in a pressurized closed circuit and the presence of a supply of the cryogenic liquid around the pump itself makes it possible to start the pump at once after a quiescent period. A level-control sonde operates to assure that the presence of the necessary minimum of liquid in the vessel.

REFERENCES:
patent: 2837898 (1958-06-01), Ahsltrand
patent: 2888879 (1959-06-01), Gaarder
patent: 3011450 (1961-12-01), Tyree, Jr.
patent: 3212280 (1965-10-01), Thomas et al.
patent: 3216210 (1965-11-01), Klipping
patent: 3379132 (1968-04-01), Wagner
patent: 3431744 (1969-03-01), Veilex et al.

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