摘要:
A gas stream classifier (1) has a gas stream classifying means for classifying a feed powder supplied from a feed supply nozzle (16), into at least a coarse powder fraction, a median powder fraction and a fine powder fraction by an inertia force acting on particles and a centrifugal force acting on a curved gas stream due to Coanda effect in a classification zone (32), wherein the classification zone (32) is defined by at least a Coanda block (26) and a plurality of classifying edges (17,18), the feed supply nozzle (16) is attached at the top of the gas stream classifier (1), the Coanda block (26) is attached on one side of the feed supply nozzle (16), and the feed supply nozzle (16) has at its rear end a feed powder intake portion (42) for supplying the feed powder, and a high-pressure air intake portion (41).
摘要:
The invention provides a fine powder production apparatus comprising a pneumatic classifying means and a pneumatic impact pulverizing means, wherein said pneumatic impact pulverizer has an accelerating tube for accelerating powder to be pulverized with high pressure gas, and a pulverizing chamber which is equipped with an impact member against which powder collides to pulverize. One end of the acceleration tube is provided with a powder feed port and a high pressure gas ejection nozzle which are concentrically arranged. Further, a communicating means is provided for feeding discharged coarse powder from the pneumatic classifying means to the pneumatic impact pulverizing means. The pneumatic classifier means has a classifying chamber, a classifying plate having its center swelled, and a classifying louver so that powder fed with carrier gas is whirled in the classifying chamber and classified into fine powder and coarse powder by means of centrifugation.
摘要:
A pneumatic impact pulverizer is disclosed which has a nozzle for feeding high-pressure gas, a tube (1) for transporting and accelerating a pulverizing material, a pulverization chamber (13), and an impact member (11) for pulverizing the material. The impact member (11) is opposed to an outlet of the accelerating tube (1) and has at least a first impact face (17) projecting toward the accelerating tube side and a second impact face (18) sloped toward the downstream side. The pulverization chamber has at least a first sidewall (15) positioned on the side more upstream than the outermost edge of the second impact face (18) and a second sidewall (16) positioned on the downstream side of the first sidewall. The pulverization chamber (13) is enlarged at its part on the side more upstream than the outermost edge of the second impact face (18) so that the cross-sectional area of the inside of the chamber (15) at that part is larger than that of the inside of the chamber (16) corresponding to the outermost edge of the second impact face (18). The tip of the first impact face (17) is positioned on the side more upstream than the downstream side edge of the first sidewall (15). The pulverization can be conducted in a very high efficiency with the pulverizer. Also, a process for producing a toner for developing electrostatic images using the pulverizer is disclosed.
摘要:
A gas stream classifier (1) has a gas stream classifying means for classifying a feed powder supplied from a feed supply nozzle (16), into at least a coarse powder fraction, a median powder fraction and a fine powder fraction by an inertia force acting on particles and a centrifugal force acting on a curved gas stream due to Coanda effect in a classification zone (32), wherein the classification zone (32) is defined by at least a Coanda block (26) and a plurality of classifying edges (17,18), the feed supply nozzle (16) is attached at the top of the gas stream classifier (1), the Coanda block (26) is attached on one side of the feed supply nozzle (16), and the feed supply nozzle (16) has at its rear end a feed powder intake portion (42) for supplying the feed powder, and a high-pressure air intake portion (41).
摘要:
An apparatus for treating the surfaces of solid particles has at least a first cylindrical treating chamber and a rotary shaft and a first rotor having two or more blades on its front face, contained in the first cylindrical treating chamber. A powder charging aperture for introducing the solid particles into the first cylindrical treating chamber together with gas is provided at the center of the front wall of the first cylindrical treating chamber, opposed to the front face of the first rotor. A first powder discharging aperture for discharging the treated solid particles is provided at the center of the rear wall of the first cylindrical treating chamber, opposed to the rear face of the first rotor. The first rotor is connected with the rotary shaft and rotated by the rotation of the rotary shaft. The height H a of the blades, the gap L 1a between the tip of each of the blades and the front wall, the largest diameter R 1a of the first rotor and the gap L 2a between the blades and the sidewall of the first cylindrical treating chamber satisfy the following conditions: 0.1 ≤ L 1a /H a ≤ 5.0, 50 × 10 -3 ≤ H a /R 1a ≤ 400 × 10 -3 and 1.0 × 10 -3 ≤ L 2a /R 1a ≤ 95 × 10 -3 .
摘要:
The invention provides a fine powder production apparatus comprising a pneumatic classifying means and a pneumatic impact pulverizing means, wherein said pneumatic impact pulverizer has an accelerating tube for accelerating powder to be pulverized with high pressure gas, and a pulverizing chamber which is equipped with an impact member against which powder collides to pulverize. One end of the acceleration tube is provided with a powder feed port and a high pressure gas ejection nozzle which are concentrically arranged. Further, a communicating means is provided for feeding discharged coarse powder from the pneumatic classifying means to the pneumatic impact pulverizing means. The pneumatic classifier means has a classifying chamber, a classifying plate having its center swelled, and a classifying louver so that powder fed with carrier gas is whirled in the classifying chamber and classified into fine powder and coarse powder by means of centrifugation.
摘要:
A separator for classifying powder with air current comprises at least a classifying chamber (4) and an introducing means for introducing powder into said classifying chamber (4), a powder feeding inlet (11) for feeding powder formed at the upper portion of said classifying chamber (4), a cone-shaped classifying plate (5) with high central portion formed at the lower portion of said classifying chamber (4), a coarse powder dischaging outlet (6) for discharging coarse powder group provided at the lower brim outer peripheral of said classifying plate (5), a fine powder group discharging outlet (7) for discharging fine powder group provided at the central portion of said classifying plate (5), a gas inflowing means (12) for dispersing powder by whirling of gas provided at the upper outer peripheral of said classifying chamber (4), and a gas inflow inlet (8) for creating whirling current of gas for classifying powder provided at the lower portion of said classifying chamber.