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:
Feb. 26, 2008
Filed:
Nov. 24, 2004
Atsushi Yoshimi, Osaka, JP;
Manabu Yoshimi, Osaka, JP;
Kazuhide Mizutani, Osaka, JP;
Hiromune Matsuoka, Osaka, JP;
Atsushi Yoshimi, Osaka, JP;
Manabu Yoshimi, Osaka, JP;
Kazuhide Mizutani, Osaka, JP;
Hiromune Matsuoka, Osaka, JP;
Daikin Industries, Ltd., Osaka, JP;
Abstract
The capacity of a compressor () in cleaning operation is set based on a Froude number Fr. The Froude number Fr expresses a ratio of an inertial force of a gas refrigerant flowing through a gas side communication pipe () to a gravity working on a liquid in the gas side communication pipe (). The capacity of the compressor () in the cleaning operation is set so that the Froude number Fr is larger than 1, whereby the inertial force of the gas refrigerant flowing through the gas side communication pipe () becomes larger than the gravity working on the liquid in the gas side communication pipe () which contains mineral oil and foreign matters. In this connection, the liquid containing the mineral oil and the foreign matters is pushed up by the gas refrigerant even in a perpendicularly extending portion of the gas side communication pipe (). Thus, the mineral oil and the foreign matters remaining in the existing liquid side communication pipe () and the existing gas side communication pipe () are recovered.