| 摘要 |
<p>[Problem to be Solved] To use a hollow filter sheet and to enable usage of the hollow filter sheet even when a part of the hollow filter sheet is damaged. [Solution] A filtration apparatus filters liquid by causing the liquid to penetrate a plurality of hollow filter sheets 1. The plurality of hollow filter sheets 1 have a suction pipe 3 inserted therethrough to be stacked with a ring-shaped packing 5 clamped therebetween. Therefore, a gap between the hollow filter sheet 1 and the suction pipe 3 is watertightly sealed. In the hollow filter sheet 1, a hollow portion 10 is provided between two filters 11, and then a spacer 12 with a surface having pits and projections is provided in the hollow portion 10. A narrow passage space 7 allowing liquid to pass through is provided between the filter 11 and the spacer 12 by pressing the two filters 11 against surfaces of the spacer 12 with the packings 5 and causing the filters 11 to be deformed into a shape according to the surfaces of the spacer 12. The narrow passage space 7 is smaller than a drainage space 8 between the filters 11 and the spacer 12 that are not clamped by the packings 5.</p> |
