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Title: Double-ended ceramic helical-rotor expander

A ceramic helical rotor expander using a double-ended or tandem herringbone type rotor arrangement with bearing and seal assemblies remote from the hot gas inlets and especially capable of operating at an inlet temperature of above C. The rotors are solid or hollow and bonded to hollow metal shafts, and mounted in a composite or simple prismatic casing. The rotors, casing and shafts are constructed from low expansivity materials. In the preferred embodiment the rotors are constructed of silicon nitride and the shafts constructed of an molybdenum alloy, with the metal shafts being supported in bearings and secured to synchronizing gears. The rotors and casing may be provided with coolant channels therein, and are constructed to eliminate the problem of end leakages at inlet temperature and pressure, and the need for high temperature bearings and seals.
 [1];  [1]
  1. (Livermore, CA)
Issue Date:
OSTI Identifier:
United States of America as represented by United States (Washington, DC) LLNL
Patent Number(s):
US 5393209
Contract Number:
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
double-ended; ceramic; helical-rotor; expander; helical; rotor; tandem; herringbone; type; arrangement; bearing; seal; assemblies; remote; hot; gas; inlets; especially; capable; operating; inlet; temperature; 1100; degree; rotors; solid; hollow; bonded; metal; shafts; mounted; composite; simple; prismatic; casing; constructed; expansivity; materials; preferred; embodiment; silicon; nitride; molybdenum; alloy; supported; bearings; secured; synchronizing; gears; provided; coolant; channels; therein; eliminate; leakages; pressure; seals; inlet temperature; channels therein; coolant channel; gas inlet; silicon nitride; preferred embodiment; hot gas; type rotor; molybdenum alloy; coolant channels; hollow metal; ceramic helical; rotor expander; /418/