VARIABLE APERTURE TWO STAGE TREATMENT TYPE FILTER

摘要

PURPOSE:To obtain the filter capable of a continuous operation of long period without clogging during the operation by organically combining an inside and an outside screens of specified structure with a separating means of foreign matter of large diameter and a separating means of foreign matter of small diameter, etc. CONSTITUTION:A raw liquid flows into the inside of the inside screen 18 from outside to inside in the radial direction, and then flows down in the inside screen 18 and passes through the conical part of the inside screen 18 to the outside in the radial direction to be filtrated. In this case, the foreign matter of large diameter caught by the outer peripheral surface of conical part of the inside screen 18 is scraped out by an upper scraper blade 32 with a slow revolution of the inside screen 18, and is discharged from a discharge port 7 of foreign matter of large diameter through a vertical trough 30 and a horizontal trough 31. And the foreign matter of small diameter caught by the inner peripheral surface of the outside screen 17 is scraped out by a lower scraper blade 40 and discharged from a discharge port 8 of foreign matter of small diameter through a vertical trough 41. And only the treated liquid filtrated is discharged from a treated liquid outlet port 6.