To provide a refrigeration air conditioner preventing the excessive rise of high pressure and the lowering of low pressure during overload operation, and preventing the shortage of a refrigerant during normal operation.
The refrigeration air conditioner 100 has a compressor 1, a condenser 2, a plurality of capillary tubes 3, an evaporator 4 equipped with heat transfer tubes of the same number as that of the capillary tubes 3, and a main circuit 101 forming a refrigerating cycle connecting them to circulate the refrigerant. The air conditioner also has a bypass circuit 6 making branch points 12 communicate with each other provided between the condenser 2 and the capillary tubes 3 with a junction 13 provided between the evaporator 4 and the compressor 1. A bypass electromagnetically operated valve 7, a bypass receiver 8, a bypass decompressing means 9 are sequentially installed in the bypass circuit 6. In a controller 10, when the pressure of a delivered refrigerant of the compressor 1 measured by a pressure sensor 11 reaches control upper limit pressure P1, the bypass electromagnetically operated valve 7 is opened, the refrigerants are sent into the capillary tubes 3 and the bypass circuit 6, and the high pressure is lowered.
OKAZAKI TAKASHI
SHIRAISHI KAZUHIKO
INOUE TAKESHI
KORISHIMA MUNEHISA
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Kiyoshi Yasushima
Souji Sasaki
Noboru Omura
Takanashi Norio
Taku Ogawa