Self-cleaning mesh filters are widely used in fields such as steel, automobiles, power plants, petrochemicals, agriculture and horticulture, and paper mills. What types of screen filters are there? Let's learn about it today.

Self-cleaning mesh filter type

1, brush self-cleaning filter
The water to be treated enters the body through the water inlet. Impurities in the water deposit on the stainless steel filter screen, creating a pressure difference. Monitor the differential pressure changes at the water inlet and outlet through the differential pressure switch. When the pressure difference reaches the set value, the electrical controller sends signals to the hydraulic control valve and the drive motor, causing the following actions: The motor drives the brush to rotate to clean the filter element, and at the same time opens the control valve for drainage. The entire cleaning process only lasts for tens of seconds. After the cleaning is completed, the control valve closes, the motor stops rotating, and the system returns to its initial state, starting the next filtration process.

2. Suction self-cleaning filter

Water from the suction self-cleaning filter enters from the inlet. First, the larger particles of impurities are filtered out through the coarse filter screen, and then it reaches the fine filter screen.

During the filtration process, the fine filter screen gradually accumulates dirt and impurities in the accumulated water, forming a filtration impurity layer. Due to the accumulation of impurity layers on the inner side of the fine filter screen, a pressure difference is formed between the inner and outer sides of the fine filter screen. When the pressure difference of the filter reaches the preset value, the automatic cleaning process will begin. During this period, the supply of clean water will continue to flow, the cleaning valve will be open, and the water pressure in the cleaning room and the vacuuming device will drop significantly. Through the pressure difference between the filter element and the suction pipe, suction force is generated between the suction pipe and the cleaning chamber through the suction nozzle, forming the suction process.

Meanwhile, the motor of the filter drives the sewage suction pipe to spiral along the axial direction. The combination of the axial and rotational movements of the vacuum cleaner completely cleans the inner surface of the entire filter screen. The entire rinsing process only takes a few dozen seconds. When the cleaning is completed, the drain valve is closed. After cleaning the filter, start preparing for the next flushing cycle.

3. Backwash the self-cleaning filter

Water from the backwash self-cleaning filter enters the filter through the water inlet. First, larger particles of impurities are filtered through the coarse filter element assembly, and then reach the fine filter screen. After filtering out small particle impurities through a fine filter screen, clear water is discharged from the outlet. During the filtration process, impurities gradually accumulate in the inner layer of the fine filter screen, creating a pressure difference between the inner and outer sides.

When the pressure difference reaches the preset value, the filter will start the automatic cleaning process: the drain valve opens, and the hydraulic motor chamber and hydraulic cylinder of the main pipeline assembly release pressure and discharge water. The pressure in the hydraulic motor chamber and the sewage suction pipe dropped sharply. Due to the effect of negative pressure, the sewage on the inner wall of the fine filter screen is absorbed through the suction nozzle, flows from the hydraulic motor into the hydraulic motor chamber, and is discharged through the sewage discharge valve, forming a sewage suction process.

When water flows through the hydraulic motor of the filter, it drives the sewage suction pipe to rotate. The hydraulic cylinder piston drives the sewage suction pipe to move axially. The dirt absorber assembly thoroughly cleans the inner surface of the entire filter screen through a combination of axial and rotational movements. The entire cleaning process will last for tens of seconds. When the cleaning is completed, the drain valve closes. The increased water pressure will cause the hydraulic cylinder piston to return to its initial position, and the filter will be ready for the next flushing cycle. During the cleaning process, the filter worked normally without any interruption.