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Title:
REFRIGERATING CYCLE DEVICE AND COOL BOX
Document Type and Number:
Japanese Patent JP2007218460
Kind Code:
A
Abstract:

To continuously and optionally vary a ratio of compressor inflow refrigerant density and expander inflow refrigerant density while preventing a temperature of a discharged refrigerant of a compressor from excessively rising in a refrigerating system using an expander coaxially connected with the compressor.

This refrigerating cycle device comprises a low order-side refrigerant circuit using a carbon dioxide as a low order-side refrigerant, and composed of a low order-side compressor 11, a former radiator 12, a low order-side heat transfer portion of a cascade heat exchanger 130, the expander 14 coaxially connected with the low order-side compressor 11, and an evaporator 15, and a high order-side refrigerant circuit using a natural refrigerant as a high order-side refrigerant, and composed of a high order-side compressor 16, a condenser 17, a high order-side expanding mechanism 18 and a high order-side heat transfer portion of the cascade heat exchanger 130. A ratio of the compressor inflow refrigerant density and the expander inflow refrigerant density can be continuously and optionally changed by controlling the density of the refrigerant flowing into the expander 14 by changing heat exchanging quantity in the cascade heat exchanger 130.

COPYRIGHT: (C)2007,JPO&INPIT


Inventors:
TAMURA TOMOICHIRO
Application Number:
JP2006037439A
Publication Date:
August 30, 2007
Filing Date:
February 15, 2006
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
F25B7/00; F25B1/00; F25B11/02; F25D13/00
Attorney, Agent or Firm:
Fumio Iwahashi
Hiroki Naito
Daisuke Nagano