| 摘要 |
PURPOSE: To improve a siphon function of a middle container by placing an air duct to open to the chamber opening downward restricted by a wall inside of the middle container and placing the lower restricted face of the chamber beneath the overflow level of the siphon. CONSTITUTION: An air duct 18 opens to a chamber 19 which, placed outside of the range of a siphon 17 and restricted by a wall 20, has no free space other than downward. Lower restricted face 21 of the chamber 19, placed beneath the overflow level 22 of the siphon 17 drains the air of the middle container 14 when the water level inside reaches to the limit face 21 whereas the air draining is suspended when the water level passes over the limit face 21 as the chamber 19 comes blocked out with other inner chambers. That is to say when the water is supplied accompanied by vapor rushing into the middle container 14, the pressure quickly rises up causing the water held in the middle container to be pushed in the siphon 17. Thus, the function of the siphon 17 is improved as the siphon fluid 23 is completely filled with the water and water flow is never blocked out. |
