| 摘要 |
The filtering apparatus of the invention comprises a filter housing having a water inlet and a water outlet as well as a filter bell dome connected to the housing. A main filter member and thereabove a reversing flow filter member are coaxially arranged on a filter support member located in the interior of the filter bell dome. The filter support member is spirally movable within the filter bell dome. Further, reversing flow filter member cleaning brushes and main filter member cleaning brushes are fixedly mounted in said filter bell dome. In the operating position, the passage through the reversing flow filter is obstructed such that the water to be filtered flows through the main filter member from the exterior to the interior thereof. In the backwashing position, the filter support member is spirally displaced and simultaneously obstructs the direct access to the exterior of the main filter member. During the spiral motion of the filter support member, the main filter member and the reversing flow filter member are cleaned by said cleaning brushes. Thus, the main filter member and the reversing flow filter member are thouroughly cleaned in the same operation step while the supply of filtered waters is maintained during the cleaning and backwashing operation.
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