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Title:
AIR-CONDITIONING DEVICE AND CONTROL METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2021/019686
Kind Code:
A1
Abstract:
An air-conditioning device comprising a heat source device, multiple indoor units, and a relay device connecting same, wherein: a gas-liquid separator is provided, the gas-liquid separator being configured to separate refrigerant flowing in from a second connection pipe into gas refrigerant and liquid refrigerant and allow the gas refrigerant to flow toward multiple gas branch pipes and the liquid refrigerant toward multiple liquid branch pipes; the relay device includes multiple cooling solenoid valves, one side of each being connected with a respective gas branch pipe and the other side being connected with a first connection pipe, and multiple heating solenoid valves, one side of each being connected with a respective gas branch pipe and the other side being connected with the gas discharge-side of the gas-liquid separator; the cooling solenoid valves are opened during cooling operation and are closed during heating operation; and the heating solenoid valves are opened during the heating operation and are closed during the cooling operation. The air-conditioning device is provided with a controller which sequentially opens the multiple heating solenoid valves and/or the multiple cooling solenoid valves when the high pressure-side pressure of the heat source device shows a high-pressure excessive increase exceeding a certain threshold set in advance.

Inventors:
NAKAO YUKI (JP)
OKANO HIROYUKI (JP)
ASANUMA HIROAKI (JP)
Application Number:
PCT/JP2019/029830
Publication Date:
February 04, 2021
Filing Date:
July 30, 2019
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
F25B13/00; F24F11/86
Domestic Patent References:
WO2018020621A12018-02-01
Foreign References:
JPS59208353A1984-11-26
JP2013023115A2013-02-04
Attorney, Agent or Firm:
KISA PATENT & TRADEMARK FIRM (JP)
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