| 摘要 |
The present invention relates to a device for cleaning of liquids in sand filters of the up-stream type. The device according to the invention is characterized in that a sand filter bed (5) is arranged in the form of at least one ring-shaped element, which possibly is arranged on either side of a feeder channel (3) in which the devices (8) are suspended in a rotating continuously travelling bridge (11) for take-up of sand, which is arranged to be cleaned in a multi-stage cleaning device (9) and returned to the upper surface of the sand filter bed (5), which is applied in order to smooth out the sand by means of a scraper device (13) which is incorporated in the bridge (11) which possibly is multi-armed and then equipped which several take-up devices (8) of which some are designed as scrapers or flushing nozzles (13) in addition to which introduction of the liquid for filtration is arranged from a chamber (1) via feeder pipes (2' and 2'') or via a separate feed-in line (1) directly or via the feeder channel (3) to the distribution troughs (4', 4'', 4''') in the sand bed (5) where the clean water is collected via a trough (6) and discharged via an outlet (7) in connection with which perforated probes (12' and 12'') are inserted in the sand filter bed (5) to monitor circulation and cleaning.
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