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:
Apr. 05, 2011
Filed:
Apr. 16, 2007
Katsumi Sakitani, Sakai, JP;
Tetsuya Okamoto, Sakai, JP;
Masakazu Okamoto, Sakai, JP;
Eiji Kumakura, Sakai, JP;
Katsumi Sakitani, Sakai, JP;
Tetsuya Okamoto, Sakai, JP;
Masakazu Okamoto, Sakai, JP;
Eiji Kumakura, Sakai, JP;
Daikin Industries, Ltd., Osaka, JP;
Abstract
In a refrigerant circuit (), a compressor () and an expander () are provided separately. An expander casing () is connected to a delivery pipe () of the compressor () and high pressure refrigerant passes through the inside of the expander casing (). Therefore, the compressor casing () and the expander casing () are equalized in their internal pressure. An oil distribution pipe () for connection of an oil sump () of the compressor () and an oil sump () of the expander () is provided with an oil regulating valve (). The oil regulating valve () is controlled in response to a signal outputted from an oil level sensor (). When the oil regulating valve () is opened, the oil sump () within the compressor casing () and the oil sump () within the expander casing () fluidly communicate with each other whereby refrigeration oil travels through the oil distribution pipe ().