| 摘要 |
PURPOSE:To make it possible to vary a boiling point of refrigerant in a water jacket, by communicating a reservoir tank for storing a liquid refrigerant to a lower tank of a condenser, and providing a solenoid valve in a passage for communicating the reservoir tank with the atmosphere. CONSTITUTION:A liquid refrigerant in a water jacket 8 is boiled and vaporized to cool an engine 7. A refrigerant vapor generated is cooled and condensed by a condenser 10, and is then stored in a lower tank 11. The condensed refrigerant is recirculated to the water jacket 8 by operating a pump 12. A reservoir tank 19 is provided to store a substitutional liquid refrigerant, and it is communicated through an auxiliary pipe 18 to the lower tank 11. A solenoid valve 21 is provided in a passage 20 for communicating the reservoir tank 19 with the atmosphere. The valve 21 is opened by a control circuit 26 upon stop of the engine to thereby prevent vacuum in the system, while it is closed during the cooling operation to vary a boiling point of the refrigerant in the water jacket 8.
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