On-line back flushing sand filter

Abstract

The on-line back flushing sand filter includes barrel, water inlet and blow-down port in the upper part of the barrel, water outlet in the lower part of the barrel, filtering material layer in the middle part and water collecting cavity below the filtering material layer. The present invention features that the middle part of the barrel has several partition boards to separate the filtering material layer into several independent filtering sectors, horizontal separating board with holes to the corresponding filtering sectors on the partition boards, hollow connecting arm over the separating board and set on one turntable, and driver for the turntable outside the barrel. The said structure makes it possible to back flush the filtering sectors one by one, so that the sand filter has greatly raised work efficiency, simple structure, small size, great back flushing pressure and good back flushing effect.

Description

technical field [0001] The invention relates to a sand filter, in particular to a pressure type sand filter with backwashing function in water treatment process. Background technique [0002] Sand filters are often used in general water treatment processes. When filtering, water flows through the filter material layer evenly through the water distributor, and is collected by the water collection chamber below the filter material layer, and then flows out of the clean water from the water outlet. During use, since the filter material layer continuously intercepts impurities in the water, after a period of operation, the increasing impurities will block the filter channel in the filter material layer, causing an increase in turbidity of the effluent or an increase in head loss , so the sand filter is generally equipped with a backwashing device, so that after a period of operation, the filter material layer can be backwashed in time to maintain the normal water purification fu...

AI Technical Summary

Problems solved by technology

However, when performing reverse flushing, since the raw water pump needs to be turned off in advance, that is, the normal filtering function of the sand filter needs to be stopped before backwashing can be carried out. Obviously, this will affect the normal filtering work of the sand filter, reduce its working efficiency, and even affect The needs of actual production, at the same time, the structure of the flushing device is complicated. When flushing, it is affected by the pressure of the air bag, and the effect is poor, time-consuming and laborious. Therefore, the sand filter with the above structure is still unsatisfactory in use, and needs further development Improve

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