MULTI-SPLIT SYSTEM AND OIL RETURN CONTROL METHOD AND DEVICE OF MULTI-SPLIT SYSTEM

WIPO Patent Application WO/2019/237698

A1

A multi-split system and an oil return control method and device of the multi-split system. The method comprises the following steps: in an operation process of the system, obtaining a minimum refrigerant flow needed for bringing lubricating oil in the system into an outdoor unit and a current refrigerant flow of the system every a first preset time; detecting and determining whether the current refrigerant flow is smaller than or equal to the minimum refrigerant flow; obtaining a total oil discharging amount of an oil return compressor from last time; detecting and determining whether the total oil discharging amount is greater than a maximum safe oil discharging amount; and controlling the system to implement oil return. Therefore, it can be guaranteed that a situation that a compressor operates in an oil starvation manner due to the large oil discharging amount and small oil return amount is avoided, the capacity and energy efficiency of the multi-split system are effectively improved, and the method is simple and practicable.

BU QIHUI (CN)
XU YONGFENG (CN)
LIANG BOQI (CN)
LI HONGWEI (CN)
DONG SHILONG (CN)
WU KONGXIANG (CN)
WU XIAOHONG (CN)
ZHANG YU (CN)

PCT/CN2018/121673

December 19, 2019

December 18, 2018

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GD MIDEA HEATING & VENTILATING EQUIPMENT CO LTD (CN)
MIDEA GROUP CO LTD (CN)

F25B43/02; F25B31/00; F25B49/02

CN108759174A	2018-11-06
CN103162469A	2013-06-19
CN101776355A	2010-07-14
CN107939649A	2018-04-20
JP2017116136A	2017-06-29
EP0848214B1	2003-04-09

TSINGYIHUA INTELLECTUAL PROPERTY LLC (CN)

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