Importance

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Abstract

Disclosed is a cascade air conditioner system. The cascade air conditioner system includes a compressor (1) having a first gas outlet (11), a second gas outlet (12) and a gas inlet (13); a flash tank (2) having a first flash evaporation port (21), a second flash evaporation port (22), a third flash evaporation port (23), and a fourth flash evaporation port (24); and a condenser evaporator (3) having a first port (31), a second port (32), a third port (33), and a fourth port (34), wherein a first heat exchanger (41) is connected in series between the first gas outlet (11) and the first flash evaporation port (21), the second flash evaporation port (22) is connected via a pipe with the first port (31), the second gas outlet (12) is connected via a pipe with the fourth flash evaporation port (24), the third flash evaporation port (23) is connected via a pipe with an inlet of a first throttle element (51), an outlet of the first throttle element (51) is connected via a pipe with a second heat exchanger (42) and is connected via a pipe with the third port (33), the second heat exchanger (42) is also connected via a pipe with the second port (32) through a second throttle element (52), and the fourth port (34) is connected via a pipe with the gas inlet (13). In the cascade air conditioner system, a gas-phase refrigerant in the compressor (1) is introduced to the flash tank (2), such that the degree of dryness in the flash tank (2) can be controlled conveniently, thereby enhancing performances of the system.

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