POWDER CLASSIFYING DEVICE

• US 20090032443A1
• Filed: 07/30/2008
• Published: 02/05/2009
• Est. Priority Date: 07/31/2007
• Status: Active Grant

• Current Assignee: Nisshin Seifun Group Incorporated
• Original Assignee: Nisshin Seifun Group Incorporated
• Inventors: Kozawa, Kazumi, Taketomi, Kenji, Kyugo, Masaru
• Granted Patent: US 8,100,269 B2
• Time in Patent Office: Days
• US Class Current: 209/135
• CPC Class Codes: B07B 11/04 Control arrangements
• CPC Class Codes: B07B 4/02 while the mixtures fall
• CPC Class Codes: B07B 7/086 generated by the winding course of the gas stream

Abstract

The powder classifying device classifies powder having a particle size distribution and collects the classified powder. The device includes a disc-like cavity to which the powder is supplied and where the supplied powder is classified, a powder supply port for supplying the powder to the cavity, guide vanes arranged so as to extend from an outer periphery of the cavity in an inner direction at a predetermined angle, a discharge unit for air streams including fine particles discharged from the cavity, a collection unit for coarse particles discharged from the cavity and air nozzles arranged below the guide vanes on an outer peripheral wall of the cavity along a tangential direction of the outer peripheral wall and blow compressed air into an inside of the cavity.

Claims

1. A powder classifying device which classifies powder having a particle size distribution and having been supplied and collects the classified powder, said powder classifying device comprising:

a disc-like cavity to which the powder having the particle size distribution is supplied and where the supplied powder is classified;

a powder supply port for supplying the powder having the particle size distribution to the disc-like cavity;

a plurality of guide vanes arranged so as to extend from an outer periphery of the disc-like cavity in an inner direction at a predetermined angle;

a discharge unit for air streams including fine particles discharged from the disc-like cavity;

a collection unit for coarse particles discharged from the disc-like cavity; and

a plurality of air nozzles that are arranged below the plurality of guide vanes on an outer peripheral wall of the disc-like cavity along a tangential direction of the outer peripheral wall and blow compressed air into an inside of the disc-like cavity.

2. The powder classifying device according to claim 1, wherein a direction in which the air streams are guided is integrally adjustable with the plurality of guide vanes.

3. The powder classifying device according to claim 1, further comprising a ring-like edge provided in a central portion of at least one of an upper surface and a lower surface in the disc-like cavity.

15. The powder classifying device according to claim 1, wherein at least one of the plurality of air nozzles is provided so as to communicate with the powder supply port.

4. A powder classifying device which classifies powder having a particle size distribution and having been supplied and collects the classified powder, said powder classifying device comprising:

a first annular cavity to which the powder having the particle size distribution is supplied;

a powder supply port for supplying the powder having the particle size distribution to the first annular cavity;

a plurality of first air nozzles that are arranged on a first outer peripheral wall of the first annular cavity along a tangential direction of the first outer peripheral wall and blow compressed air into an inside of the first annular cavity;

a disc-like cavity which is located below the plurality of first air nozzles and where the powder having the particle size distribution and having been supplied is classified;

a plurality of guide vanes arranged so as to extend from an outer periphery of the disc-like cavity in an inner direction at a predetermined angle;

a discharge unit for air streams including fine particles discharged from the disc-like cavity;

a collection unit for coarse particles discharged from the disc-like cavity; and

a plurality of second air nozzles that are arranged below the plurality of guide vanes on a second outer peripheral wall of the disc-like cavity along a tangential direction of the second outer peripheral wall and blow compressed air into an inside of the disc-like cavity.

5. The powder classifying device according to claim 4, wherein the plurality of first air nozzles are arranged in the first annular cavity to form a dispersing zone for the supplied powder having the particle size distribution in the first annular cavity.

6. The powder classifying device according to claim 4, further comprising a second annular cavity arranged below the disc-like cavity,

wherein the plurality of second air nozzles are arranged in the second annular cavity to form in the disc-like cavity a classifying zone for the powder having been dispersed.

7. The powder classifying device according to claim 4, wherein the plurality of first air nozzles are arranged in the first annular cavity, and the plurality of second air nozzles are arranged in the second annular cavity to disperse and classify the powder having the particle size distribution that was supplied into the disc-like cavity located between the first annular cavity and the second annular cavity.

8. The powder classifying device according to claim 4, wherein a direction in which the air streams are guided is integrally adjustable with the plurality of guide vanes.

9. The powder classifying device according to claim 4, further comprising a ring-like edge in a central portion of at least one of an upper surface and a lower surface in the disc-like cavity.

10. A powder classifying device which classifies powder having a particle size distribution and having been supplied and collects the classified powder, said powder classifying device comprising:

an upright disc-like cavity to which the powder having the particle size distribution is supplied and where the supplied powder is classified;

a powder supply port for supplying the powder having the particle size distribution to the upright disc-like cavity;

a plurality of guide vanes provided in the upright disk-like cavity so as to extend from an outer periphery of the upright disc-like cavity in an inner direction at a predetermined angle;

a plurality of air nozzles that are arranged on an outer peripheral wall of the disc-like cavity along a tangential direction of the outer peripheral wall and blow compressed air into an inside of the upright disc-like cavity from both surfaces of the upright disc-like cavity;

a discharge unit for air streams including fine particles discharged from the upright disc-like cavity; and

a collection unit for coarse particles discharged from the upright disc-like cavity.

11. The powder classifying device according to claim 10, further comprising a ring-like edge provided in a central portion of at least one of opposing surfaces in the upright disc-like cavity.

16. The powder classifying device according to claim 10, wherein at least one of the plurality of air nozzles is provided so as to communicate with the powder supply port.

12. A powder classifying device which classifies powder having a particle size distribution and having been supplied and collects the classified powder, said powder classifying device comprising:

a first disc-like cavity to which the powder having the particle size distribution is supplied;

a powder supply port for supplying the powder having the particle size distribution to the first disc-like cavity;

a plurality of first air nozzles that are arranged on a first outer peripheral wall of the first disc-like cavity along a tangential direction of the first outer peripheral wall and blow compressed air into an inside of the first disc-like cavity;

a plurality of first guide vanes provided below the plurality of first air nozzles so as to extend from an outer periphery of the first disc-like cavity in an inner direction at a predetermined angle;

a discharge unit for air streams including fine particles discharged from the first disc-like cavity;

a second disc-like cavity that receives air streams from the first disc-like cavity including a part of the powder which has such a particle size distribution and is the remainder of the powder that is not discharged through the discharge unit, and classifies the part of the powder included in the received air stream and having such the particle size distribution;

a plurality of second air nozzles that are arranged on a second outer peripheral wall of the second disc-like cavity along a tangential direction of the second outer peripheral wall and blow compressed air into an inside of the second disc-like cavity;

a plurality of second guide vanes arranged so as to extend from an outer periphery of the second disc-like cavity at a predetermined angle;

a plurality of third air nozzles that are arranged below the plurality of second guide vanes, on the second outer peripheral wall of the second disc-like cavity along the tangential direction of the second outer peripheral wall, and blow compressed air into the inside of the second disc-like cavity; and

a collection unit for coarse particles discharged from the second disc-like cavity.

13. The powder classifying device according to claim 12, further comprising, in a central portion of the second disc-like cavity, a medium particle collection unit that collects particles having sizes equal to or smaller than a classification point set in a lower centrifugal chamber having the second disc-like cavity as a main component.

14. The powder classifying device according to claim 12, further comprising a ring-like edge provided in a central portion of at least one of an upper surface and a lower surface in the first disc-like cavity.