Title:
AIR FLOW CLASSIFIER, AND CLASSIFYING PLANT
Document Type and Number:
WIPO Patent Application WO/2007/145207
Kind Code:
A1
Abstract:
A casing (2) is provided therein with a classifying plate (7), which has a coarse
powder discharge port (8) formed around its outer circumference, and a fine powder
discharge cylinder (12) is connected to a fine powder suction port (11) formed
at the central portion of the classifying plate (7). The casing (2) is constituted
of a skirt portion (14) for forming a primary classifying chamber (13) between
itself and the outer circumference portion of the upper face of the classifying
plate (7), and a cylindrical portion (15) disposed radially inside of the skirt
portion (14) for forming a secondary classifying chamber (16) coaxially with
the primary classifying chamber (13). In the outer circumference of the primary
classifying chamber (13), there are equidistantly formed a plurality of air
nozzles (33), from each of which high-pressure air is injected circumferentially
of the outer circumference of the primary classifying chamber (13) to establish
a swirling air flow, which is introduced into the secondary classifying chamber
(16) and caused to ascend while swirling. The secondary classifying chamber
(16) is provided, around its outer circumference wall, with a powder feeding
header (34) of an annular shape, and the powder, which has been supplied to and
swirled in the powder feeding header (34), is swirled into the secondary classifying
chamber (16) from an inlet port (36) formed in the inner circumference wall of
the powder feeding head (34), so that the powder is swirled and centrifugally
separated into coarse powder and intermediate powder containing the coarse
powder. The intermediate powder is caused to ascend, while being swirled, along
the inner face of the circumference wall of the secondary classifying chamber
(16), and is moved radially inward along the ceiling of the secondary classifying
chamber (16). At the same time, an intense downward swirling vortex is generated
at the central portion of the secondary classifying chamber (16) thereby to separate
the intermediate powder centrifugally into the coarse powder and the fine powder,
the latter of which is sucked into the fine powder discharge cylinder (12).
Inventors:
KAWASAKI, Hiroichi (Nippon Pneumatic Manufacturing Co. Ltd., 1300-80, Yabata, Nabari-sh, Mie 05, 5180605, JP)
Application Number:
JP2007/061807
Publication Date:
December 21, 2007
Filing Date:
June 12, 2007
Export Citation:
Assignee:
NIPPON PNEUMATIC MANUFACTURING CO., LTD. (11-5, Kamiji 4-chome Higashinari-ku, Osaka-sh, Osaka 03, 5370003, JP)
日本ニュ－マチック工業株式会社 (〒03 大阪府大阪市東成区神路四丁目１１番５号 Osaka, 5370003, JP)
日本ニュ－マチック工業株式会社 (〒03 大阪府大阪市東成区神路四丁目１１番５号 Osaka, 5370003, JP)
International Classes:
B07B7/08; G03G9/087; B07B7/00; G03G9/087
Attorney, Agent or Firm:
KAMADA, Bunji et al. (18-12, Nipponbashi 1-chomeChuo-ku, Osaka-shi, Osaka 73, 5420073, JP)
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