所谓虹吸式进水口,即电站压力管道在前池的进水段为虹吸管形式。虹吸管的最高断面(驼峰)下缘高程略高于前池水位,当需要切断压力管道水流时,只要开启设于虹吸管顶部的一个小尺寸的通气阀,空气被吸入虹吸管段,即可实现快速而彻底的断流。这种断流方式几乎不产生正水击压力。这种进水结构可以省去一般必须设置的工作闸门, The so-called siphon water inlet, that is, the power station pressure pipe in the forebay of the siphon section into the water form. The lower edge of the highest section of the siphon (hump) is slightly higher than the water level of the forecake. When it is necessary to cut off the pressure of the water in the pressure pipe, the air is drawn into the siphon section by opening a small-sized vent valve located at the top of the siphon for rapid Completely cut off. This cut-off method produces almost no water hammer pressure. This water inlet structure can save the work gate which must be set in general,