To provide a refrigerant circuit of an air conditioner which can be stably operated at a low manufacturing cost.
In the refrigerant circuit of the air conditioner in which a compressor 2, condenser 3 (or 5), an expansion valve 7b (or 7a) and an evaporator 5 (or 3) are sequentially connected by a refrigerant flow passage, a flow passage L for bypassing a space B between the evaporator 5 and the compressor 2 and a space A between the condenser 3 and the expansion valve 7b are provided and an electromagnetic opening/closing valve 10 and a capillary tube 9 are provided at the bypassing flow passage L with the capillary tube 9 on the B side and the electromagnetic opening/closing valve 10 on the A side. A pressure sensor 11 is provided between the electromagnetic opening/closing valve 10 and the capillary tube 9 and "fixed evaporating pressure control" is conducted during cooling operation and "fixed condensing pressure control" is conducted during heating operation by work control of the electromagnetic opening/closing valve 10. In addition, in the case that temperature of discharging refrigerant from the compressor 2 abnormally rises, liquid refrigerant is introduced to the compressor 2 through the bypassing flow passage for cooling down the compressor 2.
ISOZUMI SHINICHI
Tadahiro Mitsuishi
Yasuyuki Tanaka
Hiroshi Matsumoto
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