| 摘要 |
A fluid filter (10) comprises a plurality of separate filtration chambers (14-18) with a fluid inlet (12) and a fluid outlet (13). All of the filtration chambers (14-18) are identical and each contain two vertically-spaced doors (28, 29) on one end and two similarly vertically-spaced doors (30, 31) on the other end. In addition, each of the filtration chambers (14-18), includes a trap door through which accumulated particulate matter is discharged. The filtration chambers (14-18) are defined as first and second filtration stages and a cleaning stage. By sequencing the opening and closing of doors (28, 29, 30 and 31) the interconnection between the filtration chambers (14-18) is changed. As particulate matter is accumulated on the inner surface of a filtration medium (25) the first and second filtration stages and cleaning stages are changed so that each of the chambers (14-18), in turn, serve as all or part of the first filtration stage, second filtration stage and cleaning stage. Accordingly, the filter can operate continuously after a filter layer is accumulated on the filter medium in any one of the filtration chambers without a significant decrease in filtration efficiency. |
