Airflow crusher classifier is the key to the production of ultra-fine powder, because the particle size of the 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 air mill classifier has high efficiency, the quality of graded products will be good, the energy consumption of grinding operation will be greatly reduced, and the processing capacity will be significantly improved.
Airflow crusher classifier is a kind of equipment that uses the centrifugal force of impeller rotation and the resistance 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. The seal failure is an important reason for the rough product or the mixing of some coarse particles in the finished product.
Sealing mode of airflow crusher classifier:
(1) Airflow seal
Generally, ordinary turbine classifier can achieve sealing effect in theory by inhibiting particles from rising to the top of the classifier wheel through the high-speed rotation of the classifier wheel. Most domestic horizontal classifiers also use air seal, but the leakage of large particles in the classifier wheel can not be strictly controlled, and the air consumption increases gradually with time due to wear.
(2) Mechanical seal
Mechanical seal can be divided into concave convex inlaid seal, adjustable gap seal and labyrinth seal.
The main principle of labyrinth seal is to ensure the sealing effect by controlling the sealing clearance. However, because the gap always exists, some coarse or even millimeter particles are directly mixed into the finished product without rotor sorting. Therefore, the sealing effect of mechanical labyrinth seal in Superfine Classifier is not good.
Differential pressure air classifier adopts differential pressure air seal structure, which has the characteristics of high classification accuracy, energy saving and low production cost. It has been widely used in the classification and purification process of time, feldspar, mica, kaolin and magnesium oxide.