Improved type backwashing-free and automatic blowdown sand filtering cylinder

The invention belongs to the technical field of water treatment equipment, particularly relates to an improved type backwashing-free and automatic blowdown sand filtering cylinder, and solves the technical problems in the prior art that the design is not reasonable enough and the like. A cylinder body is internally provided with a suspension type filtering mechanism which can be suspended between a water outlet and a water inlet; a dirt collection and settlement pipe is arranged at the bottom of the cylinder body; a vortex centrifuging mechanism which enables sewage to be settled to the dirt collection and settlement pipe by rotational flow still water is arranged between the water inlet and the dirt collection and settlement pipe; and a blowdown valve is arranged at the discharging end of the dirt collection and settlement pipe. Compared with the prior art, the improved type backwashing-free and automatic blowdown sand filtering cylinder has the advantages that 1. the design is reasonable and the structure is simple, and dirt in the sand filtering cylinder can be cleaned without stopping; 2. the operation is convenient, the utilization is convenient and the automation degree is high; 3. the maintenance is convenient and the service life is long; and 4. the filtering effect is good and the continuous operation of water cycle can be guaranteed.