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Patent Searching and Data


Title:
OIL RETURN CONTROL METHOD FOR MULTI-SPLIT AIR CONDITIONER
Document Type and Number:
WIPO Patent Application WO/2021/012769
Kind Code:
A1
Abstract:
An oil return control method for a multi-split air conditioner, comprising: determining to enter oil return operation according to an operation load ratio Q in the system and accumulated time; then, adjusting the operation frequency of a compressor according to the ambient temperature, and recording oil return operation time and compressor suction temperature; and finally, determining the oil return operation time according to oil return time or the compressor suction temperature. The method can effectively solve the problems during oil return in heating operation of an air conditioner in winter of fluctuations in outlet air temperature of indoor units due to oil return when switching a four-way valve to refrigerating operation and compressor flooding due to excessive liquid return during the oil return. Moreover, unnecessary oil return can also be reduced to avoid excessive oil return, thereby improving the operation reliability.

Inventors:
FANG JIE (CN)
YANG YAHUA (CN)
YI BO (CN)
GUO CHENG (CN)
Application Number:
PCT/CN2020/091823
Publication Date:
January 28, 2021
Filing Date:
May 22, 2020
Export Citation:
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Assignee:
NANJING TICA CLIMATE SOLUTIONS CO LTD (CN)
International Classes:
F25B31/00; F25B49/02
Domestic Patent References:
WO2008024110A12008-02-28
Foreign References:
CN110411065A2019-11-05
CN106369879A2017-02-01
JPH0370943A1991-03-26
CN104764167A2015-07-08
Attorney, Agent or Firm:
NANJING TIANHUA PATENT AGENT CO., LTD. (CN)
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