| 摘要 |
<p>A ceramic filter (1) is constituted of a porous body (2) and filtration films (5). The porous body (2) has main flow paths (3) penetrating from one end surface (4a) to the other end surface (4b) of the body. The filtration films (5) are arranged on the inner wall surfaces of the main flow paths (3). Slit-like auxiliary flow paths (9) are formed in predetermined portions so that specific main flow paths (3a) are communicated with an external space. Openings of the specific flow paths (3a) at both end faces (4a, 4b) are sealed. A fluid to be purified that flows in the filter from first opening portions (11) of the main flow paths (3) is purified by permeating it inside the porous body (2). The fluid is then taken out as a purified fluid from an outer peripheral surface (6) of the porous body (2) and exits (10) of the auxiliary flow paths (9). The filter is characterized in that film thicknesses (x1, x2) of filtration films of adjacent main flow paths (3b) are greater than film thicknesses (y1, y2, y3) of filtration films of an inner main flow path (3c). The ceramic filter can be used for a long period, and a deposit on the filter can be easily removed by reverse flow washing.</p> |
