PULSE TUBE CRYOCOOLER WITH COMPACT SIZE AND DECREASED DEAD VOLUME

摘要

The present invention relates to a pulse tube cryocooler (PTC) comprising a regenerator having a cold end (20a) and a hot end, a pulse tube (18) having a cold end (20b) and a hot end, and a reservoir (26). The hot end of the regenerator is connected or connectable with a compressor and the cold end of the regenerator (14) is in fluid communication with the cold end of the pulse tube (18). The PTC (42) comprises a reservoir-flow path (28) connecting the hot end of the pulse tube (18) and the reservoir (26) and a bypass-flow path (30) connecting the hot ends of the regenerator (14) and the pulse tube (18), wherein the reservoir-flow path (28) and the bypass-flow path (30) comprise a first and second flow restriction means (50, 54), respectively. The PTC (42) further comprises a holding structure (44) to which the hot ends of the regenerator (14) and the pulse tube (18) are mounted, wherein the bypass-flow path (30) is formed inside the bulk of the holding structure (44).