| 摘要 |
A filtering device, in particular for fish basins, has a housing (10) encompassing a filter chamber (20) and a filter drum (30), which is rotatably disposed in the filter chamber (20) and is loadable with water to be purified, about which a filter belt (40) is guided along part of its circumference from a dispensing roller (42) to a receiving roller (41) that is driven by a paddle wheel (5) disposed outside the filter chamber (20). The paddles (51) of the filter wheel are activated by unpurified water in such a way that the filter belt (40) is wound from the dispensing roller (42) onto the receiving roller (41). As the filter belt that loops around the filter drum becomes increasingly dirty and the water level in the filter chamber rises as a result, the unpurified water that is delivered by a pump flows over an overflow onto the paddle wheel as a mechanical drive means and places a receiving roller for the dirty filter belt into rotation. This causes the receiving roller to continually wind up with its circumference the filter belt that is looped around the filter drum from the dispensing roller, causing unused filter belt that is permeable for the water being purified to advance onto the filter drum, the filtering effect to resume, and the water level to again drop below the overflow. The energy that is required for this regulating process is therefore generated solely in a mechanical fashion by the overflowing water. As a result, the filtering capacity of known filtering devices can be improved, and they can be designed to be low-maintenance.
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