| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a water supply and drainage system that can make miniaturization and efficiency of water supply/drainage operation compatible.SOLUTION: When a downstream side water exhaust port 31 is hermetically sealed, with an upstream side water exhaust port 21 open, sewage water sucked into an upstream side water tank 2 is accumulated in a downstream side water tank 3. Meantime, when the upstream side water exhaust port 21 is hermetically sealed, with the downstream side water exhaust port 31 open, sewage water sucked into the upstream side water tank 2 is accumulated in the upstream side water tank 2 and, simultaneously, water is drained from the downstream side water tank 3 through the downstream side water exhaust port 31. As a result, the water supply and drainage system 1 can make natural draining possible from the downstream side water tank 3, thereby dispensing with a water exhaust pump. Also, during draining from the downstream side water tank 3, water is accumulated in the upstream side water tank 2, so that water supply into the upstream side water tank 2 and drainage from the downstream side water tank 3 can be simultaneously performed. Consequently, frequent drainage from the downstream side water tank 3 will not cause a specific problem. Therefore, the water supply and drainage system 1 can be structured by using the downstream side water tank 3.</p> |
