PURPOSE: To make the device compact by tuning back a pulse tube 180° in an arc and arranging the pulse tube, a high temperature end heat exchanger, an orifice valve, and a buffer tank in a line parallel to an arrangement of a compressor, a heat exchanger for preliminary cooling, a cold heat accumulator, and a low temperature end heat exchanger.
CONSTITUTION: A pulse tube 15 is turned back 180' at the end connected with a low temperature end heat exchanger 14 so that the pulse tube 15, a high temperature end heat exchanger 16, an orifice valve 18, and a buffer tank 17 are arranged in a line parallel to an arrangement of a compressor 8, a heat exchanger for preliminary cooling 11, a cold heat accumulator 12, and a low temperature end heat exchanger 14. For this structure, the total length X can be reduced to roughly a half compared with a conventional structure and, unlike an elbow-shaped bend, the bend is formed in an arc. With no sharp turning in the passageway for refrigerant, a cryogenic refrigerating device having the pressure loss minimized, being compact in structure, and having a high refrigerating capacity can be produced.
IKEGAMI KAZUO
OSUMI MASATO
KUROKAWA MICHIHIRO
