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.:
Date of Patent:
Oct. 14, 2008
Filed:
Dec. 25, 2003
Katsumi Sakitani, Sakai, JP;
Michio Moriwaki, Sakai, JP;
Masakazu Okamoto, Sakai, JP;
Eiji Kumakura, Sakai, JP;
Tetsuya Okamoto, Sakai, JP;
Katsumi Sakitani, Sakai, JP;
Michio Moriwaki, Sakai, JP;
Masakazu Okamoto, Sakai, JP;
Eiji Kumakura, Sakai, JP;
Tetsuya Okamoto, Sakai, JP;
Daikin Industries, Ltd., Osaka, JP;
Abstract
A refrigerant circuit () of a refrigeration apparatus is filled up with carbon dioxide as a refrigerant. In the refrigerant circuit (), a first compressor () and a second compressor () are arranged in parallel. The first compressor () is connected to both an expander () and a first electric motor (), and is driven by both of the expander () and the first electric motor (). On the other hand, the second compressor () is connected only to a second electric motor (), and is driven by the second electric motor (). In addition, the refrigerant circuit () is provided with a bypass line () which bypasses the expander (). The bypass line () is provided with a bypass valve (). And, the capacity of the second compressor () and the valve opening of the bypass valve () are regulated so that the COP of the refrigeration apparatus is improved after enabling the refrigeration apparatus to operate properly in any operation conditions.