What are the advantages and disadvantages of different sealing methods of air classifier

The air classifier is the key to the production of ultrafine powder, because the particle size of the final product is controlled by the classifier. It is very important to measure the quality of the air classifier in addition to its cutting particle size. If the efficiency of the air classifier is high, the quality of the classification product is good, the energy consumption of the grinding operation can also be greatly reduced, and the processing capacity can be significantly improved.

　　air flow classifierIt is a kind of equipment that uses the centrifugal force of impeller rotation and the traction force generated by airflow to classify materials. The seal between the rotating cage rotor and the stationary shell is an important part of the structure of the vortex air classifier, and the failure of the seal is an important reason for the coarse fineness of the product or the mixing of some coarse particles in the finished product.

air classification machine sealing way:

(1) Airflow seal

Ordinary turbine classifier is usually through the high-speed rotation of the classification wheel to inhibit the particles rising to the top of the classification wheel, in theory, the sealing effect can be achieved, the domestic horizontal classifier also mostly uses air flow seal, but can not strictly control the large particle leakage of the classification wheel, and due to wear and tear, the gas consumption gradually increases with the passage of time.

(2) Mechanical seal

Mechanical seals can be divided into concave-convex mosaic seal, adjustable gap seal and labyrinth seal.

The main principle of labyrinth seal is to ensure the sealing effect by controlling the sealing gap. However, because the gap always exists, some coarse or even millimeter particles are directly mixed into the finished product without being sorted by the rotor. Therefore, the sealing effect of mechanical labyrinth seal in ultrafine classifier is not good.

differential pressure typeair flow classifierThe differential pressure air seal structure has the characteristics of high classification accuracy, energy saving, high efficiency and low production cost, and has been widely used in the classification purification process of quartz, feldspar, mica, kaolin, magnesium oxide and so on.