The ZFH series high-efficiency turbine ultrafine classifier consists of a feed volute with dispersed guide vanes on the upper part and a high-speed backward multi blade classification impeller. The classification impeller and outlet are sealed with dynamic airflow; The lower part is a secondary sorting device with a secondary air inlet device. The main structure is shown in Figure 1.

This machine mainly utilizes the screening theory of turbine grading wheels; The balance between the centrifugal force generated by a rotating turbine and the centripetal force formed by air. Its main working principle is that the material to be classified is sucked into the classification chamber by the high-pressure negative pressure suction system through the feeding machine. Here, it is first dispersed and guided by the blades, and is subjected to a strong centrifugal force field near the vortex shell and classification turbine. The fine powder that meets the requirements is sucked out of the classification impeller and collected by the collection device. The coarse material falls into the lower box, where it is dispersed again due to the influence of the secondary air intake. The fine powder mixed in the coarse powder enters the classification area again with the airflow, and the coarse material falls down along the inner wall and is collected by the shut-off fan. Due to the special sealing mechanism used between the turbine and the upper casing, the sealing effect is very superior and the discharge particle size is more uniform. By adjusting the speed of the driving motor and the size of the secondary air intake, a good grading effect can be achieved.