| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an air flow classifier which can classify powders sharply and accurately. Ž<P>SOLUTION: A classification plate 2 is installed in a casing 1, a coarse powder outlet 3 is formed on the periphery of the classification plate 2, and a fine powder discharge pipe 4 is connected to the central part of the classification plate 2. In the casing 1, a primary classification chamber 5 is set on the upper side of the classification plate 2, and a secondary small diameter classification chamber 8 is set on the primary classification chamber 5. A plurality of air nozzles 15 are set at equal intervals on the periphery of the primary classification chamber 5, a solid-gas mixed fluid is jetted in the peripheral part circumference direction of the primary classification chamber 5 from each air nozzle 15, and the powder is whirled in the primary classification chamber 5 to be separated centrifugally into coarse powder and intermediate powder containing fine powder. The intermediate powder is whirled along the peripheral wall inner surface of the secondary classification chamber 8, high pressure air is jetted from a plurality of accelerating air nozzles 16 installed on the peripheral wall of the secondary classification chamber 8 during the whirling, and the whirling velocity of the intermediate powder is accelerated. The intermediate powder ascending while whirling in the secondary classification chamber 8 is moved inward in the radial direction along the ceiling surface and separated centrifugally into coarse powder by forming a strong downward whirling eddy in the central part of the secondary classification chamber 8, and fine powder is sucked into the fine powder discharge pipe 4. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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