METHOD OF AIR-CENTRIFUGAL CLASSIFICATION OF POWDERS AND DEVICE TO THIS END Russian patent published in 2010 - IPC B07B7/83 

FIELD: process engineering.

SUBSTANCE: invention relates to powder metallurgy and can be sued in metallurgy, machine building etc. Proposed method comprises feeding powder and airflow part into separation zone, powder disaggregation, powder classification under effect of centrifugal forces and pulsating aerodynamic forces opposed with the former, and withdrawing coarse and fine fractions. Airflow is divided into two flows, one with flow rate of (10-20)% is fed into proportioner neck, while main flow with flow rate of (80-90)% is fed to separation zone inlet. Variable-section pulsating flow is created at separation zone outlet. Proposed device comprises housing, collector with nozzles, driven rotor with disk elements that form separation zone, proportioner with neck, air distributor with branch pipes, flow metres and shutter, fine fraction discharge branch pipe communicated with cyclone, filer, high-pressure blower and separated product collection containers. Air distributor first branch pipe communicated with proportioner neck, while its second branch pipe communicates with collector with nozzles. Pulsator is arranged at separation zone outlet and consists of two identical coaxial disks with radial perforation. Perforated hole number makes 13-80. One of said disks is secured to the rotor, while, another one is attached to fixed outlet branch pipe of classifier.

EFFECT: higher efficiency and expanded rage of separation limit adjustment.

2 cl, 1 dwg, 1 tbl