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. 21, 2020
Filed:
Nov. 17, 2015
Applicant:
Mitsubishi Electric Corporation, Tokyo, JP;
Inventor:
Shuhei Mizutani, Tokyo, JP;
Assignee:
Mitsubishi Electric Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F25B 31/00 (2006.01); F25B 1/00 (2006.01); F25B 13/00 (2006.01);
U.S. Cl.
CPC ...
F25B 31/004 (2013.01); F25B 1/00 (2013.01); F25B 13/00 (2013.01); F25B 31/002 (2013.01); F25B 2500/16 (2013.01); F25B 2700/03 (2013.01);
Abstract
An air-conditioning apparatus includes firstly a refrigerant circuit in which a condenser, an expander, an evaporator, a compressor, and an oil separator are connected by pipes, and secondly an oil return circuit configured to return oil from the oil separator to the compressor. The compressor includes an oil concentration sensor configured to detect oil concentration inside the compressor. The oil return circuit includes multiple solenoid valves that are each opened or closed corresponding to the oil concentration detected by the oil concentration sensor.