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Patent Searching and Data


Title:
AIR-CONDITIONING DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/003096
Kind Code:
A1
Abstract:
This air-conditioning device comprises: a heat source unit that has a compressor, a flow path switching valve, and a heat-source-side heat exchanger; a plurality of indoor units that have load-side heat exchangers and perform cooling operations or heating operations; a low-pressure pipe and a high-pressure pipe that connect the heat source unit and the indoor units; a relay unit that has a first branch portion, which has first opening-closing valves which are switched to connect one end of the load-side heat exchangers to the low-pressure pipe, and second opening-closing valves which are switched to connect said ends of the load-side heat exchangers to the high-pressure pipe, and a second branch portion, which connects the other end of the load-side heat exchangers to the high-pressure pipe through first expansion valves and to a medium-pressure return pipe through second expansion valves; a leakage detection unit that detects leakage of a refrigerant; and a control device that controls the first expansion valves and the second expansion valves. The control device performs pump down operation for closing all the first expansion valves and the second expansion valves and recovering the refrigerant to the heat source unit when the leakage of the refrigerant is detected by the leakage detection unit.

Inventors:
OKANO HIROYUKI (JP)
Application Number:
PCT/JP2016/069539
Publication Date:
January 04, 2018
Filing Date:
June 30, 2016
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
F25B1/00; F25B49/02; F25B13/00
Domestic Patent References:
WO2014091741A12014-06-19
WO2016017643A12016-02-04
Foreign References:
JP2003130482A2003-05-08
US20150176848A12015-06-25
JPH02140574A1990-05-30
JPH05118720A1993-05-14
JPH11142004A1999-05-28
JP2000097527A2000-04-04
JPH046355A1992-01-10
Attorney, Agent or Firm:
KISA PATENT & TRADEMARK FIRM (JP)
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