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Title:
FREEZING DEVICE
Document Type and Number:
Japanese Patent JP3952951
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To drive a freezing device in any operating condition, and to improve COP of the freezing device.
SOLUTION: Carbon dioxide is filled as a refrigerant in a refrigerant circuit 10 of the freezing device. A first compressor 21 and a second compressor 22 are arranged in parallel in the refrigerant circuit 10. The first compressor 21 is connected with both an expander 23 and a first electric motor 31, and driven by both of them. The second compressor 22 is connected with only a second electric motor 32, and driven by it. A bypass piping 40 bypassing an expander 22 is arranged in the refrigerant circuit 10. A bypass valve 41 is arranged in the bypass piping 40.


Inventors:
Katsumi Hokoya
Moriwaki Michio
Masakazu Okamoto
Eiji Kumakura
Tetsuya Okamoto
Application Number:
JP2003001972A
Publication Date:
August 01, 2007
Filing Date:
January 08, 2003
Export Citation:
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Assignee:
Daikin Industries, Ltd.
International Classes:
F25B11/02; G01C21/00; B64D45/00; B64D47/06; F25B1/00; F25B9/00; F25B9/06; F25B13/00; G01S13/91; G08G5/00; (IPC1-7): F25B11/02; F25B1/00
Domestic Patent References:
JP2000329416A
JP2001116371A
JP3172587A
JP3137457A
JP2003279179A
Foreign References:
WO2001042035A1
Attorney, Agent or Firm:
Hiroshi Maeda
Hiroshi Koyama
Hiroshi Takeuchi
Takahisa Shimada
Yuji Takeuchi
Katsumi Imae
Atsushi Fujita
Kazunari Ninomiya
Tomoo Harada
Takashi Goto
Iseki Katsumori