Abstract: The present invention provides a self-cleaning suction filter including a filter mechanism and a sewage suction assembly. The sewage suction assembly is rotatably arranged at the center of a fine strainer and communicated with a sewage discharge cavity through a sewage suction pipe, and the sewage suction pipe is spacedly and fixedly provided with a plurality of “T”-shape suction nozzles for suctioning deposits on the inner wall of the fine strainer. The self-cleaning suction filter further includes: a sand collection cavity arranged at the tail of the fine filter cavity and communicated with the fine filter cavity; and the coarse filter cavity, the fine filter cavity, and the sand collection cavity descend in height. Water are automatically collected in the sand collection cavity and discharged in time, thereby ensuring the stable filter function after the filter is used for a long time.

Abstract: The present invention relates to a reversible backwashing self-cleaning filter, including a filter mechanism, a backwashing drive mechanism driving a sewage suction assembly, and a high-pressure washing apparatus. The high-pressure washing apparatus includes a high-pressure washing pump and at least one high-pressure branch pipe arranged along the outer wall of the fine strainer and operating synchronously with the sewage suction assembly, where a plurality of spray nozzles are spacedly arranged where the high-pressure branch pipe is opposite to the outer wall of the fine strainer. With collaboration of translation and rotation of the sewage suction assembly, the inner and outer walls of the entire fine strainer are thoroughly cleaned, suitable for real-time purification of a low-pressure water circulating system.