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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 9746221 B1

PDFFull Text
Date of Patent:
Aug. 29, 2017

Filed:

Nov. 25, 2014

Defrost system for refrigeration apparatus, and cooling unit

Applicant:

Mayekawa Mfg. Co., Ltd., Tokyo, JP;

Inventors:

Choiku Yoshikawa, Tokyo, JP;

Toshio Kutsuna, Tokyo, JP;

Mugabi Nelson, Tokyo, JP;

Daiki Kayashima, Tokyo, JP;

Assignee:

MAYEKAWA MFG. CO., LTD., Tokyo, JP;

Attorney:

Rossi, Kimms & McDowell LLP

Primary Examiner:

Len Tran

Assistant Examiner:

Jenna M Hopkins

Int. Cl.
CPC ...
F25B 47/02 (2006.01); F25D 17/02 (2006.01); F25B 1/10 (2006.01); F25B 7/00 (2006.01); F25D 21/10 (2006.01); F25B 9/00 (2006.01); F25B 41/00 (2006.01); F25B 41/04 (2006.01); F25B 49/02 (2006.01); F25D 21/12 (2006.01); F25D 21/14 (2006.01); F25B 25/00 (2006.01); F25B 23/00 (2006.01);
U.S. Cl.
CPC ...
F25B 47/02 (2013.01); F25B 1/10 (2013.01); F25B 7/00 (2013.01); F25B 9/00 (2013.01); F25B 9/008 (2013.01); F25B 41/00 (2013.01); F25B 41/04 (2013.01); F25B 49/02 (2013.01); F25D 17/02 (2013.01); F25D 21/10 (2013.01); F25D 21/12 (2013.01); F25D 21/14 (2013.01); F25B 23/006 (2013.01); F25B 25/00 (2013.01); F25B 2339/047 (2013.01); F25B 2347/022 (2013.01); F25B 2400/072 (2013.01); F25B 2400/13 (2013.01);
Abstract

A defrost system includes: a cooling device in a freezer, and includes a casing, a heat exchanger pipe with a difference in elevation in the casing, and a drain receiver unit below the heat exchanger pipe; a refrigerating device to cool and liquefy COrefrigerant; and a refrigerant circuit for permitting the cooled and liquefied COrefrigerant to circulate to the heat exchanger pipe. The defrost system includes a bypass pipe of the heat exchanger pipe to form a COcirculation path; an on-off valve in the heat exchanger pipe to be closed during defrosting so that the COcirculation path is a closed circuit; a pressure adjusting unit for adjusting pressure of the COrefrigerant during defrosting; and a brine circuit as a first heating medium, in which the defrost system permits the COrefrigerant to naturally circulate in the closed circuit during defrosting by a thermosiphon effect.

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