| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a filtration device which is excellent in filtration performance and also eliminates contaminants at the lower side of the filtration device.SOLUTION: The inside of a filtration case is partitioned into upper and lower filtration chambers 61, 65 by a partitioning plate 3 having a water-passing hole 30. A drain pipe 4 is provided ranging from the bottom wall of the filtration case to the upper part of the filtration case, and a water-passing hole 46 communicating with the lower filtration chamber 65 is formed at the lower part of the drain pipe 4. Filtration materials 62, 66 are stored in the upper and lower filtration chambers 61, 65. When air bubbles are generated from air bubble generating means 5 inside the drainage pipe, water sucked into the upper filtration chamber 61 from a water suction hole 20 at the upper part of the filtration case passes through the filtration material 62, a partition-plate water-passing hole 30, the filtration material 66 in the lower filtration chamber 65, the pipe water-passing hole 46 and the drain pipe 4, and is drained from the tip end of the pipe, on the other hand, water sucked into the lower filtration chamber 65 through a bottom-part water suction hole 10 at the bottom part of the filtration case passes through the filtration material 66, the pipe water-passing hole 46 and the drain pipe 4, and is drained from the tip end of the pipe.</p> |
