CRYOGENIC REFRIGERATOR AND CONTROLLING METHOD THEREFOR

Title:

CRYOGENIC REFRIGERATOR AND CONTROLLING METHOD THEREFOR

Document Type and Number:

WIPO Patent Application WO/1998/011394

Kind Code:

A1

Abstract:

A gas-pressure driven type cryogenic refrigerator in which a cylinder (2) is partitioned into a lower pressure chamber (20), an upper pressure chamber and expansion chambers (30, 31) by a slack piston (17) and a displacer (22) connected thereto. A rotary valve (35) is adapted to set up alternately a high-pressure open-valve state that high-pressure helium gas is supplied into the upper pressure chamber (29) and the expansion chambers (30, 31) and a low-pressure open-valve state that helium gas is discharged from the upper pressure chamber (29) and the expansion chambers (30, 31), whereby the slack piston (17) is driven by virtue of the difference in gas pressure between the upper and lower chanbers (29, 20) to thereby reciprocate the displacer (22). The reciprocation produces cryogenic coldness. The time ratio of the low-pressure open-valve state is set at 55-65 %, higher than that of the high-pressure open-valve state, thereby improving the capability of the refrigerator.

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Inventors:

OKAMOTO MASAKAZU (JP)
KURIHARA TOSHIYUKI (JP)

Application Number:

PCT/JP1997/003145

Publication Date:

March 19, 1998

Filing Date:

September 05, 1997

Export Citation:

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Assignee:

DAIKIN IND LTD (JP)
OKAMOTO MASAKAZU (JP)
KURIHARA TOSHIYUKI (JP)

International Classes:

F25B9/14; (IPC1-7): F25B9/14

Foreign References:

JPS6321451A	1988-01-29
JPH06101917A	1994-04-12
JPH0735070A	1995-02-03
JPS4610255B2
JPH06300378A	1994-10-28
JPH06300378A	1994-10-28

Other References: