| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a efficient filtration action and to effectively fulfill filter purification function utilizing a photocatalytic reaction by forming a filter device of filter material so that one end part in the longitudinal direction is opened and other end part is closed and also size of an opening is formed gradually smaller as nearer approaching the other end part. SOLUTION: An opening part 20 used for the inflow port of material to be filtrated is formed of many long fibrous bodies 11 in one end of the filter device. A bundled convergent part 21 is formed in other end thereof. A part surrounding space part 22 formed in a range from the opening part 20 to the convergent part 21 constitutes a filtration part 23 being a part performing filtration action. Filtration area of the filtration part 23 is made large by this constitution. Further, when space part being the flow path of fluid to be filtrated is formed into a shape which is gradually narrowed as nearer approaching the inner part (tip part), pressure decrease of introduced fluid is supplemented in some degree and pressure difference between respective positions on the inner peripheral face of the filtration part 23 is made small. Therefore, such action effect is obtained that deviation of collection is relaxed.</p> |
