| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide at low cost, a refrigerating circuit for air conditioning which can prevent liquid washing phenomenon of a compressor when being left for a long time period while minimizing power loss as much as possible. Ž<P>SOLUTION: In the refrigerating circuit for air conditioning, a discharge side sealing valve 33 is provided to a first and second pipings 9a, 9b for connecting a discharge chamber 17b in a compressor 1 to a condenser 3. The discharge side sealing valve 33 is composed of a valve chamber 35a vertically extending in a mounted state, a discharge ports 35b for communicating a side of the valve chamber 35a to a discharge chamber 17b, and a discharge valve port 35c for communicating an upper end of the valve chamber 35a to the condenser 3, a valve element 37 vertically movably provided in a mounted state to open the discharge valve port 35c through the descent by differential pressure and self weight and to close the discharge valve port 35c through the levitation by liquid coolant L and lubricating oil, and a low pressure port 35d formed in a lower end of the valve chamber 35a downward from the valve element 37 to communicate with a suction chamber 17a of the compressor 1. In particular, the coolant is separated from the lubricating oil into two layers within a using temperature range of the compressor 1. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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