Control device and control method for preventing system oil blockage

Abstract

The application relates to the technical field of air conditioners, in particular to a control device and a control method for preventing system oil blockage. The control device comprises a compressor, a four-way valve, a heat exchanger unit, a main electronic expansion valve, an ejector unit and a controller, one end of the compressor is connected with a first end of the four-way valve, the other end of the compressor is connected with a second end of the four-way valve; the heat exchanger unit comprises an indoor heat exchanger and an outdoor heat exchanger, one end of the indoor heat exchanger and one end of the outdoor heat exchanger are respectively connected with a third end and a fourth end of the four-way valve; one end of the ejector unit is arranged on a connecting pipeline between the first end of the four-way valve and the one end of the compressor, the other end of the ejector unit is arranged on a connecting pipeline between the main electronic expansion valve and the other end of the indoor heat exchanger. The application can intelligently start a bypass branch to perform closed-loop adaptive preheating on key throttling components, early warning and accurate intervention on oil blockage, and avoid the sharp fluctuation of refrigerant flow.

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