REGENERATIVE CRYOGENIC REFRIGERATING MACHINE

摘要

PROBLEM TO BE SOLVED: To raise operation characteristics without deteriorating refrigeration performance by preventing convection of a refrigerant gas between gaps of a cylinder and a displacer constituting a cold storage unit. SOLUTION: A regenerative cryogenic refrigerating machine produces cold by compressing the refrigerant gas by a compressor, and reciprocating the displacers 10 and 17 of the first stage cold storage unit 3 and the second stage cold storage unit 6. A material having a coefficient of heat shrinkage equal with or smaller than that of a material constituting the first and the second stage cylinders 9 and 16 is used to make the first and the second stage displacers 10 and 17. The displacers 10 and 17 are cold storage containers packed with a cold storage material, and are constituted of a fiber reinforced resin which expands as temperature is lowered. The cylinders 5 and 6 are made of a stainless steel.