The liquid flows in from the inlet of the filter, part of the liquid flows directly from the lower end of the filter element, and the other part enters the top of the filter element from the central branch pipe, and then flows in from the upper end of the filter element. The liquid flows in at the same time from the upper and lower openings of the filter element, and penetrates the inner surface of the filter element, collect and flow out at the outlet.
Particulate impurities are intercepted on the inner surface of the filter element, accumulated into a filter cake and reach a certain thickness, the filtration pressure loss gradually increases, and the filtration flux gradually decreases.
Backwash status:
When the set differential pressure or time is reached, self-cleaning is started, and the decelerating motor drives the backwashing rotating arm to align with one or a group of filter elements.
The upper end of the filter element is sealed by the slider, and the lower end is connected to the backwashing nozzle to open the backwashing. The valve connects the filter element to the backwashing pipeline.
The differential pressure between the outside of the filter element and the backwash outlet drives the filtered clean liquid to flush the filter cake on the inner surface of the filter element at high speed and discharge from the backwash outlet.
After that, the backwashing valve is closed, and the backwashing rotating arm then backwashes the next filter element or group. After all filter elements are backwashed one by one, the entire self-cleaning process is completed.
