The water enters the filter from the water inlet, firstly filters out the impurities of the larger particles through the coarse filter element, and then reaches the fine filter mesh, and the impurities of the fine particles are filtered through the fine filter mesh, and the clean water is discharged from the water outlet. During the filtration process, the inner layer of the fine mesh gradually accumulates, and a pressure difference is formed between the inner and outer sides. When the pressure difference reaches the preset value, the automatic cleaning process will start: the drain valve is opened, the hydraulic motor chamber and the hydraulic cylinder of the main assembly release the pressure and the water is discharged; the pressure in the hydraulic motor chamber and the suction pipe is greatly reduced due to the negative The pressure acts to suck the dirt on the inner wall of the fine filter through the suction nozzle, and the hydraulic motor flows into the hydraulic motor chamber and is discharged by the drain valve to form a suction process. When the water flows through the hydraulic motor, the suction pipe is driven to rotate, and the suction cylinder drives the suction pipe to move axially. The suction device assembly completely cleans the inner surface of the filter through the combination of the axial movement and the rotary motion. The entire cleaning process will last for tens of seconds. The drain valve closes at the end of the wash and the increased water pressure causes the hydraulic cylinder piston to return to its original position and the filter begins to prepare for the next flush cycle. During the cleaning process, the normal filtration of the filter is uninterrupted.
