Pump design for circulating supercritical carbon dioxide

Details Pump design for circulating supercritical carbon dioxide Pump design for circulating supercritical carbon dioxide

2006-01-17

2006-01-17

Koczo, Jr., Michael (Department: 3746)

Pumps

Motor driven

Pump fluid communicates with sealed chamber containing armature

C417S366000, C417S423700, C310S087000, C310S254100, C310S261100

Reexamination Certificate

active

06986647

ABSTRACT:
In accordance with an embodiment of the present invention, a pump assembly for circulating a supercritical fluid is disclosed. The pump assembly comprises an impeller for pumping fluid between a pump inlet and a pump outlet; a rotating pump shaft coupled to the impeller, wherein the pump shaft is supported by corrosion resistant bearings; a rotor of a DC motor potted in epoxy and encased in a non-magnetic material sleeve; and a stator sealed from the fluid via a polymer sleeve. The pump can be of centrifugal type. The bearings can be made of silicon nitride balls combined with bearing races made of Cronidur® and can operate without oil or grease lubrication. The polymer sleeve can be a PEEK™ sleeve which forms a casing for the stator. The non-magnetic material sleeve encasing the rotor of the DC motor is preferably made of stainless steel. A portion of the fluid passing through the pump assembly can be diverted over the bearings and/or the rotor and stator.

REFERENCES:
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patent: 3135211 (1964-06-01), Pezzillo
patent: 3135884 (1964-06-01), Luenberger
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patent: 5779445 (1998-07-01), Yokota et al.
patent: 6262510 (2001-07-01), Lungu
patent: 6447270 (2002-09-01), Schmidt et al.
patent: 6847140 (2005-01-01), Kimberlin et al.

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