Title:
MULTI-SPLIT SYSTEM AND LIQUID RETURN PREVENTION CONTROL METHOD THEREOF DURING DEFROSTING OF MULTI-SPLIT SYSTEM
Document Type and Number:
WIPO Patent Application WO/2018/082282
Kind Code:
A1
Abstract:
A multi-split system and a liquid return prevention control method thereof during defrosting of the multi-split system. The method comprises the following steps: when the multi-split system is in heating operation, detecting gas exhaust pressure (PC), gas return pressure (PE) and gas exhaust temperature (TP) of a compressor (21) in real time; if an outdoor unit (20) receives a defrosting instruction, sending a defrosting signal to a diverter (30) and heating indoor units in multiple indoor units (10), controlling, by means of the diverter (30), a throttling element (EXV2) to close before first reversing of a four-way valve (22) and last for a preset time, so as to reduce the amount of a refrigerant returned to the outdoor unit (20); and regulating the opening of the throttling element (EXV2) according to the gas exhaust pressure (PC), gas return pressure (PE) and gas exhaust temperature (TP) during defrosting operation of the multi-split system, so that the risk of liquid return occurred to the compressor (21) during a defrosting process, and the safety and reliability of the system are greatly improved.
Inventors:
TANG CHANGJING (CN)
Application Number:
PCT/CN2017/084224
Publication Date:
May 11, 2018
Filing Date:
May 12, 2017
Export Citation:
Assignee:
GD MIDEA HEATING & VENTILATING EQUIPMENT CO LTD (CN)
MIDEA GROUP CO LTD (CN)
MIDEA GROUP CO LTD (CN)
International Classes:
F25B47/02; F25B13/00; F25B30/02; F25B41/34
Domestic Patent References:
| WO2006112322A1 | 2006-10-26 |
Foreign References:
| CN106524557A | 2017-03-22 | |||
| CN105805975A | 2016-07-27 | |||
| CN105115199A | 2015-12-02 | |||
| CN105318454A | 2016-02-10 | |||
| US5732564A | 1998-03-31 | |||
| KR20070088911A | 2007-08-30 | |||
| JP2003240310A | 2003-08-27 |
Attorney, Agent or Firm:
TSINGYIHUA INTELLECTUAL PROPERTY LLC (CN)
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