Cryogenic pump multi-part piston with thermal expansivity compen

Details Cryogenic pump multi-part piston with thermal expansivity compen Cryogenic pump multi-part piston with thermal expansivity compen

1987-06-17

1989-03-21

Garrett, Robert E.

Expansible chamber devices

Piston

Radially adjustable side wall portion

92253, 92259, 417901, 277 26, 277117, F16J 910, F16J 928, F04B 1508

Patent

active

048133426

ABSTRACT:
A reciprocating pump for a cryogenic fluid includes a pump cylinder made of a material with low thermal expansivity, a piston displaceable in the pump cylinder, and self-lubricating piston rings made of polytetrafluorethylene held on the circumferential surface of the piston. The rings have a larger thermal expansivity than the pump cylinder. The arrangement allows optimum matching of piston rings and pump cylinder at cryogenic fluid pumping temperatures. The piston has a core made of a material with relatively large thermal expansivity which is surrounded by a spacer sleeve made of a material with a low coefficient of thermal expansion. The core protrudes on both sides from the spacer sleeve and has expanding regions increasing conically towards its free ends. The piston rings surround the core in the expanding regions and are supported against the end faces of spacer sleeve. The conical expanding regions bias the rings toward the cylinder at low temperatures to insure effective sealing.

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Burr, M. E., "The Development of Large Diameter, High Pressure, Cryogenic dial Static Seals, " ASLE Preprint 76-AM-5B-2, paper presented at the 31st Annual ASLE Meeting; Philadelphia, Penn., May 10-13, 1976.
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Gottzmann, C. F., "High Pressure Liquid Hydrogen and Helium Pumps," AICE, Advances in Cryogenic Engineering, vol. 5, 1960, pp. 289-298.

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