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. 09, 2018
Filed:
Dec. 18, 2013
Gree Electric Appliances, Inc. of Zhuhai, Zhuhai, Guangdong, CN;
Chun Huang, Zhuhai, CN;
Peigang Song, Zhuhai, CN;
Hexin Liu, Zhuhai, CN;
Zebin Chen, Zhuhai, CN;
Qunbo Liu, Zhuhai, CN;
Abstract
An oil return method for multi-split air conditioner in heating comprises steps of: S, adjusting operation frequency fof a compressor () to a first preset oil return frequency f, and simultaneously, adjusting open degree Sof each indoor throttling element () to a preset oil return open degree; S, measuring operation parameters of the air conditioner; S, judging whether the air conditioner operates abnormally, jumping to Step Sif so, or jumping to Step Sif not; S, exiting from oil return process, adjusting the operation frequency fof the compressor () to a second preset oil return frequency f, judging whether the air conditioner operates abnormally, existing from the oil return process if so, or jumping to Step Sif not; S, ending the oil return process when oil return time reaches the oil return time t