Backflush rotary wing injection hole is sealed by the upper and lower bearing means for supporting the filter cartridge and the inner diameter of the two mating tube.Pressure source with a certain velocity, instantaneous projection to powder extinguishers filter fiber surface, to fear of falling dust, the role of self-cleaning cartridge.Blowback rotary wing mainly with an outer diameter of 325mm, powder extinguishers cleaning device inside diameter of 190 to 220 between the size of the design (also provide other specifications).The device selection is made efficient.