Self-cleaning Filter

"Self-cleaning" is not a new concept in industrial filtration, but many self-cleaning filters on the market either fail to backwash thoroughly, causing the screen to clog progressively, or their cleaning mechanisms frequently jam, requiring frequent manual intervention-essentially no better than ordinary manual filters. Our Self-cleaning Filter was developed from the start with the goal of "truly no manual cleaning." Its core innovation is the suction scanner-a set of slotted suction nozzles that move in a helical reciprocating motion along the inner surface of the screen. When the drain valve opens, the differential pressure generates high-velocity jets through the nozzles that forcefully suction and extract the contaminants attached to the screen, rather than simply flushing with flow. This active suction cleaning is several times more efficient than traditional backwashing, restoring screen permeability to over 95% after a single cleaning, with no dead zones. We ran a one-month test on our bench using turbid circulating water with 200ppm sand content, with automatic cleaning twice a day. After one month, we disassembled and inspected the screen; the surface deposit thickness was less than 0.1mm-almost negligible. In comparison, a conventional backwash filter tested under the same conditions showed significant yellowing and partial mesh blockage. We recorded this comparison on video and show it to visitors during plant tours.

Moreover, we have incorporated dual safety guarantees into the Self-cleaning Filter. The cleaning actuator is driven by a motor plus a manual handwheel override-if the motor fails or there is a power outage, the operator can rotate the handwheel to manually complete the suction scanning, ensuring the system does not shut down due to the filter. The control system is equipped with both a differential pressure sensor and an accumulated runtime dual-trigger logic; either condition will initiate the cleaning program automatically, and during cleaning the inlet and outlet valves remain open, maintaining full flow filtration. The housing uses a bottom-in, side-out flow design, so large particles first settle into the bottom discharge chamber rather than directly impacting the screen, effectively extending the cleaning interval. We installed one Self-cleaning Filter in a paper mill's white water recovery system. The paper machine ran 24/7, and the filter automatically cleaned four times a day, operating fault-free for 18 consecutive months. The mill's equipment manager said, "This is the only filter we have ever used that truly requires no human attention." This comment makes us extremely proud, because it means we fully achieved our original design goal-freeing human hands from repetitive cleaning work.