| 摘要 |
PROBLEM TO BE SOLVED: To provide a jet mill capable of grinding a material to be ground into desired grain sizes with small variation in them, capable of obtaining high classifying accuracy, and made up of a simple internal structure and easily cleaned before and after use. SOLUTION: A disc-shaped cavity formed in a jet mill body is divided into a ring-shaped grinding zone for grinding a material to be ground using a high-speed stream of air supplied through two or more air nozzles and a ring-shaped classifying zone which is set up and positioned at the inner side of the grinding zone and connected to space at an outlet and classifies the material to be ground by air streams. A ring-shaped first narrow passage is provided in between the grinding zone and the classifying zone to separate as well as to connect those two zones, and preferably, a further ring-shaped second narrow passage is to be provided in between the classifying zone and its inner outlet to separate as well as to connect the classifying zone and the outlet space to solve the above problem. COPYRIGHT: (C)2005,JPO&NCIPI
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