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Operating principle of scraper filter

December 23,2022

Compared with the backwash self-cleaning water filter, the scraper filter is more widely used. It can not only be used for water filtration, but also fully used for self-cleaning filtration of viscous materials such as solvent, acid and alkali, polymer, paint, etc. The filter is a precision equipment mainly used to remove suspended solids and particulate matter in water body, reduce turbidity, purify water quality, reduce system dirt, bacteria, algae, rust, etc., to purify water quality and protect normal operation of other equipment in the system.

Theprinciple of scraper filter: The water enters from the inlet, first filters out the impurities of larger particles through the coarse filter screen, and then reaches the fine filter screen. During the filtering process, the fine filter screen gradually accumulates the dirt and impurities in the accumulated water, forming a filtering impurity layer. Since the impurity layer accumulates at the inner side of the fine filter screen, a differential pressure is formed at the inner and outer sides of the fine filter screen. When the pressure difference of the scraper filter reaches the preset value, the automatic cleaning process will start. The clean water supply will flow continuously, the cleaning valve will open, and the water pressure in the cleaning chamber and the dirt suction device will drop significantly. Through the pressure difference between the filter cartridge and the dirt suction pipe, a suction force will be generated between the dirt suction pipe and the cleaning chamber through the suction nozzle, forming a dirt suction process. At the same time, the electric motor drives the sewage suction pipe to spiral along the axial direction. The combination of axial movement and rotary movement of the dirt absorber completely cleans the inner surface of the whole filter screen. The whole flushing process of the scraper filter only takes tens of seconds. The drain valve is closed at the end of cleaning. The filter starts to prepare for the next flushing cycle.

In addition, it should be understood that theprecision range of scraper filter housingis 30-3000 microns, and it can handle liquids with viscosity up to 800000 centipoises, which are used in water treatment, petrochemical, metallurgy, electric power, fine chemical industry, coating, ink, paper making, food and beverage, pharmacy, metal processing and other industries. In addition, the scraper filter has a ring type fully automatic operation, high filtering accuracy, stable and reliable performance, which is the benefit choice to replace the traditional manual filter or the disposable filter material filter. It can replace the traditional filter core filter, bag filter, basket filter, vibrating screen filter, etc. in many fields.

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