FRESH-AIR AIR CONDITIONING SYSTEM AND CONTROL METHOD

摘要

A fresh-air air conditioning system and control method, the system comprising an interior unit (1) and an exterior unit (2). The interior unit (1) comprises a first interior heat exchanger (11) and a second interior heat exchanger (13). The exterior unit (2) comprises a compressor (21), intake bypass circuit, first accumulator (22) and second accumulator (23). The intake bypass circuit comprises a first electromagnetic valve (24), second electromagnetic valve (25), and third electromagnetic valve (26). A first end of the first electromagnetic valve (24) is connected to a first end of the first interior heat exchanger (11), and a second end of the first electromagnetic valve (24) is connected via the first accumulator (22) to a first intake end of the compressor (21) and a first end of the third electromagnetic valve (26). The second end of the third electromagnetic valve (26) is connected via the second accumulator (23) to a second intake end of the compressor (21) and a first end of the second electromagnetic valve (25). The second end of the second electromagnetic valve (25) is connected to a first end of the second interior heat exchanger (13). When one of the first interior heat exchanger (11) or second interior heat exchanger (13) is closed, the third electromagnetic valve (26) opens so that the first accumulator (22) and second accumulator (23) simultaneously communicate with the open interior heat exchanger, avoiding poor oil return as a result of prolonged single-cylinder operation of the compressor, and ensuring the reliability of the compressor as well as interior comfort.