Automatic sewage filters are widely used in metallurgy, chemical industry, petroleum, papermaking, food, mining, electricity, urban water supply, such as filtration of industrial wastewater, circulating water, waste oil filtration treatment, continuous casting water system, blast furnace water system, and high-pressure water descaling system for hot rolling in the metallurgical industry. It is an easy to operate fully automatic filtration device.

The equipment structure and working principle of the automatic sewage filter: The automatic sewage filter consists of a housing, a multi-element filter element, a backwash mechanism, an electric control box, an electric valve, and a differential pressure controller. The transverse partition inside the shell divides its inner cavity into upper and lower chambers. The upper chamber is equipped with multiple filter cartridges, which fully utilize the filtering space and significantly reduce the volume of the filter. The lower chamber is equipped with a backwash suction cup. During operation, the turbid liquid enters the lower chamber of the filter through the inlet and then enters the inner cavity of the filter element through the partition hole. Impurities larger than the gap of the filter element are intercepted, and the clean liquid passes through the gap to reach the upper chamber and is sent out from the outlet.

The wedge-shaped filter used in the automatic sewage filter cartridge is automatically cleaned through pressure differential control and timed control. When impurities accumulate on the surface of the filter element, causing the pressure difference between the inlet and outlet to increase to the set value, the backwash mechanism is driven. When the backwash suction cup port is aligned with the filter element, the drain valve opens, and the system releases pressure and drains water. A negative pressure zone with a relative pressure lower than the water pressure outside the filter element appears on the inside of the suction cup and filter element, forcing some of the clean circulating water to flow from the outside of the filter element into the inside of the filter element. Impurities and particles adsorbed on the inner wall of the filter element flow into the tray with the water and are discharged from the drain valve. The specially designed filter creates a jet effect inside the filter element, and any impurities will be washed away from the smooth inner wall. When the pressure difference between the inlet and outlet of the filter returns to normal or the timer set time ends, the material does not stop flowing throughout the entire process, and the backwash consumes less water, achieving continuous and automated production.