| 摘要 |
PROBLEM TO BE SOLVED: To prevent occurrence of a fault or decrease in ability due to a reverse flow of condenser condensate or condenser cooling water to a mold or mixture with a vacuum pump. SOLUTION: When it is detected that a water level of a storage water W of a condenser 3 has arrived at a predetermined forcible drainage starting level 12 disposed under a vapor suction port 3a of the condenser 3 and a suction port 4a of a vacuum pump 4, the water W in the condenser 3 is forcibly discharged. It is detected that water level of the water W becomes lower than a predetermined forcible drainage stop level L1 disposed below a forcible drainage starting level L2 and above a water absorption port 7a of a forcible draining means 7, and forcible drainage is stopped. When the level of the water W arrives at a predetermined danger level L3 disposed above the level L2 and below a vapor suction port 3a and the port 4a of the pump 4 even if it is forcibly drained, injection of cooling water into the condenser 3 is stopped. |
