| 摘要 |
<p>PROBLEM TO BE SOLVED: To eliminate an inside oilless condition caused by foaming in a short time, by controlling a cooling medium circulation preventing means in the state of air conditioning switch off and with a detection value found by used environment detecting means more than the set value and by allowing cooling medium circulation in an outside cooling medium circuit so as to continue this state for a preset period of time. SOLUTION: When an air conditioner switch is in its OFF state, respective temperatures in an evaporator, of the atmosphere and inside of a cabin and a sunshine intensity are detected by an environmental condition detecting means and when anyone of them is more than its set value, the number of revolution of a rotary shaft 16 is detected from speed of an engine 20, and when this number is more than its set value, foaming control is carried out. And an internal circulation state is released and the operation of a compressor with its maximum ejection quantity is continued until a preset time passes. Although the inside of the compressor comes in its oilless state once, but after the preset time passes, cooling medium gas including lubricant is absorbed so as to feed lubricant to each sliding part. Thus, the oilless state can be eliminated in a short time for not exerting any influence on each sliding part substantially.</p> |
