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Patent Searching and Data


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.

Inventors:
Okamoto, Masakazu (Kanaoka Factory, Sakai Plant Daikin Industries, Ltd., 1304, Kanaoka-ch, Sakai-shi Osaka 591, JP)
Kurihara, Toshiyuki (Kanaoka Factory, Sakai Plant Daikin Industries, Ltd., 1304, Kanaoka-ch, Sakai-shi Osaka 591, JP)
Application Number:
PCT/JP1997/003145
Publication Date:
March 19, 1998
Filing Date:
September 05, 1997
Export Citation:
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Assignee:
DAIKIN INDUSTRIES, LTD. (Umeda Center Building, 4-12 Nakazaki-nishi 2-chom, Kita-ku Osaka-shi 530, JP)
Okamoto, Masakazu (Kanaoka Factory, Sakai Plant Daikin Industries, Ltd., 1304, Kanaoka-ch, Sakai-shi Osaka 591, JP)
Kurihara, Toshiyuki (Kanaoka Factory, Sakai Plant Daikin Industries, Ltd., 1304, Kanaoka-ch, Sakai-shi Osaka 591, JP)
International Classes:
F25B9/14; (IPC1-7): F25B9/14
Foreign References:
JPS6321451A
JPH06101917A
JPH0735070A
JPS4610255B2
JPH06300378A
JPH06300378A
Other References:
See also references of EP 0862030A1
Attorney, Agent or Firm:
Maeda, Hiroshi (Taihei Building, 4-8 Utsubohonmachi 1-chome, Nishi-k, Osaka-shi Osaka 550, JP)
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