| 摘要 |
A filter apparatus for liquids containing impurities, in particular solid particles, preferably for filtering plasticized thermoplastic synthetic plastic material, has a housing (1) in which at least one stationary, substantially flat filter (5) is disposed. The liquid to be cleaned is supplied to the filter (5) in the region of its periphery through at least one supply channel (3). The cleaned liquid is conducted off the housing through at least one downstream channel (7). At least one scraper element (17) is pressed with its scraping edge (31) against the upstream-side surface (11) of the filter (5), this scraper element (17) being movably connected to a scraper carrier (12) which can be rotated by a drive means (15) around an axis which is directed substantially perpendicular to the upstream-side surface (11) of the filter (5). The scraper element (17) strips off the impurities adhering to this surface (11) and conveys them towards the center of the filter (5) wherefrom the impurities are conveyed off the housing by means of at least one screw (38) through at least one discharge channel (39) starting from the center of the filter (5) and extending out of the housing (1). At least one scraper element (17) is connected to the scraper carrier (12) so that it can swivel around an axis (18) and the scraper element (17) extends from this axis obliquely with respect to the filter (5) in direction of rotation of the scraper carrier (12). The scraping edge (31) of the scraper element (17) is pressed by the counter-pressure of the liquid to be cleaned against the filter (5), when the scraper carrier (12) is in rotation. Thereby, a blocking of the scraper element (17) is effectively avoided.
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