| 摘要 |
PROBLEM TO BE SOLVED: To discharge drain water remaining in a vacuum system to the outside of the system, without stopping a vacuum pump and releasing the inside of the vacuum system to atmosphere.SOLUTION: In a drain discharge device in a vacuum system, a drain water flow down system is constituted to successively connect a first check valve connected to a drain water residual part in a vacuum system and regulating flow to the residual part, a branch pipe, a trap storing drain water and a second check valve regulating flow to the trap; a three-way valve is provided, which is connected from the drain water flow down system in a branched manner and selectively passes through the exhaust of a vacuum pump and the vacuum system; and drain water in the trap is discharged to the outside of the system by discharge pressure of the vacuum pump. |
