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Title:
A defrost system and a refrigeration unit of refrigeration equipment
Document Type and Number:
Japanese Patent JP6046821
Kind Code:
B2
Abstract:
A defrost system includes: a cooling device which is disposed in a freezer, and includes a heat exchanger pipe with a difference in elevation disposed in a casing, and a drain receiver unit disposed below the heat exchanger pipe; a refrigerating device configured to cool and liquefy CO 2 refrigerant; a refrigerant circuit for permitting the CO 2 refrigerant cooled and liquefied in the refrigerating device to circulate to the heat exchanger pipe; a bypass pipe connected between an inlet path and an outlet path of the heat exchanger pipe to form a CO 2 circulation path including the heat exchanger pipe; an on-off valve disposed in each of the inlet path and the outlet path of the heat exchanger pipe and configured to be closed at a time of defrosting so that the CO 2 circulation path becomes a closed circuit; a pressure adjusting unit for adjusting pressure of the CO 2 refrigerant circulating in the closed circuit at the time of defrosting; and a brine circuit which includes a first lead path disposed adjacent to lower area of the heat exchanger pipe in the cooling device and forming a first heat exchanger part for heating the CO 2 refrigerant circulating in the heat exchanger pipe, with brine, in the lower area of the heat exchanger pipe, in which the defrost system permits the CO 2 refrigerant to naturally circulate in the closed circuit at the time of defrosting by a thermosiphon effect.

Inventors:
Yoshikawa Asahi
Satoshi Kutsuna
Nelson, Mugabi
Taiki Kayashima
Application Number:
JP2015533001A
Publication Date:
December 21, 2016
Filing Date:
November 25, 2014
Export Citation:
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Assignee:
Maekawa Manufacturing Co., Ltd.
International Classes:
F25B47/02; F25B1/00; F25D21/12
Domestic Patent References:
JP2013124812A2013-06-24
JP2010181093A2010-08-19
JP2001027473A2001-01-30
JPS52131652U1977-10-06
JPS5244468U1977-03-29
JP2004170007A2004-06-17
JP2013160427A2013-08-19
JP2013124812A2013-06-24
JP2010181093A2010-08-19
JP2001027473A2001-01-30
JPS52131652U1977-10-06
JPS5244468U1977-03-29
JP2004170007A2004-06-17
JP2013160427A2013-08-19
Foreign References:
WO2009034300A12009-03-19
WO2009034300A12009-03-19
Attorney, Agent or Firm:
Seishin ip patent business corporation



 
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