Oil-balancing control of combined air conditioners
A technology of a multi-connected air conditioner and a control method, which is applied in the field of air conditioners, can solve the problems of oil equalization failure, waste of electric energy, and decline in the capacity of outdoor units, and achieves the effects of saving energy consumption, optimizing operating performance, and improving service life.
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[0030] The basic principles of the present invention and the traditional multi-line system oil balance mode are the same, and the pressure difference between the oil chambers promotes the directional flow of the refrigerating oil to achieve oil balance.
[0031] The specific process and principle of the mode of realizing oil balance in the present invention are as follows:
[0032] As shown in Figure 1, the control method for the oil balance of the multi-connected air conditioner of the present invention is to connect the main engine 1 outside the multi-connected air conditioner and a group of sub-machines 2 in parallel through the oil equalizing pipe 7, and each compressor oil cavity 8 communicates with the low-pressure suction side , first make each compressor connect an electronic expansion valve 3 in series on the thin tube 5 of the condenser, connect a low-pressure pressure sensor 4 on the suction pipe 6, and then connect the electronic expansion valves 3 in parallel, when...
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