| 摘要 |
PROBLEM TO BE SOLVED: To protect a compressor against damage by making the compressor to suck refrigerant gas and lubricant separated in an accumulator efficiently and preventing insufficient lubrication thereby ensuring reliability of the compressor. SOLUTION: Wet refrigerant from an evaporator fed through a suction pipe 56 is subjected to gas/liquid separation and lubricant forms an upper layer while liquid refrigerant forms a lower layer at the bottom of an accumulator 55 because of the difference of specific gravity. The liquid refrigerant is heated above saturation temperature by means of a heater 60 provided on the bottom of the accumulator 55 and evaporated. It is then sucked through a delivery pipe 57 into a compressor and only lubricant stands on the bottom of the accumulator 55. Subsequently, a valve 61 in a delivery pipe 59 laid on the bottom of the accumulator 55 is opened and the lubricant is sucked therefrom into the compressor. The series of operations is controlled by detection signals from a liquid level detector 63, a refrigerant saturation temperature detector 64 and a refrigerant temperature detector 65 mounted on the accumulator 55. |
