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Patent Searching and Data


Title:
MULTI-SPLIT AIR CONDITIONING SYSTEM AND POWER-OFF CONTROL METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2022/068942
Kind Code:
A1
Abstract:
A multi-split air conditioning system and a power-off control method therefor, the system and the method aiming to solve the problem of an existing multi-split air conditioning system having a poor means for processing the situation wherein some indoor units are abnormally powered off. The multi-split air conditioning system comprises a controller, an outdoor unit and a plurality of indoor units, wherein each indoor unit comprises a correspondingly arranged indoor electronic expansion valve, and the controller can control an opening/closing state of the indoor electronic expansion valves. The power-off control method comprises: acquiring the situation in terms of whether an indoor unit is abnormally powered off; and if the indoor unit is abnormally powered off, connecting a controller and an indoor electronic expansion valve, which corresponds to the indoor unit, to a backup power source, and making the controller control the indoor electronic expansion valve corresponding to the indoor unit to be closed. Therefore, the problem of abnormal oil return and even liquid slugging caused by the backflow of a large amount of refrigerant in an indoor unit can be effectively prevented, thereby effectively ensuring the stable operation of a multi-split air conditioning system at a low cost.

Inventors:
CHENG SHAOJIANG (CN)
ZHUO BAITIAN (CN)
WANG JUN (CN)
SHI BIN (CN)
Application Number:
PCT/CN2021/123035
Publication Date:
April 07, 2022
Filing Date:
October 11, 2021
Export Citation:
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Assignee:
QINGDAO HAIER AIR CONDITIONING ELECTRONIC CO LTD (CN)
QINGDAO HAIER AIR CONDITIONER GENERAL CORP LTD (CN)
HAIER SMART HOME CO LTD (CN)
International Classes:
F24F3/06; F24F11/37; F24F11/64
Foreign References:
CN112762527A2021-05-07
CN106152409A2016-11-23
CN108413586A2018-08-17
CN107314476A2017-11-03
CN111981634A2020-11-24
CN108709284A2018-10-26
CN106403142A2017-02-15
JPH04353336A1992-12-08
Attorney, Agent or Firm:
HANRAY LAW FIRM (CN)
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