Patent · US Active

Gas balanced cryogenic expansion engine

US8776534B2 · kind B2 · utility

4Cited by

18References

13Claims

0Family size

Assignee

Sumitomo (SHI) Cryogenics of America, Inc. · US

Inventors

Stephen Dunn · Bethlehem, US
Ralph C. Longsworth · Allentown, US
John Borchers · Elmore, AU

Key dates

Filing date	May 12, 2011
Grant date	Jul 15, 2014
Priority date	—
Expiry date	Jul 24, 2031

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF25B9/06
WIPO fieldThermal processes and apparatus
WIPO sectorMechanical engineering

Abstract

An expansion engine operating on a Brayton cycle which is part of a system for producing refrigeration at cryogenic temperatures that includes a compressor, a counter-flow heat exchanger, and a load that may be remote, which is cooled by gas circulating from the engine. The engine has a piston in a cylinder which has nearly the same pressure above and below the piston while it is moving. Low pressure on a piston drive stem provides a force imbalance to move the piston towards the warm end.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.