US 2021/0078044 A1 · POWDER CLASSIFYING APPARATUS

Abstract

This powder-classifying apparatus has: a centrifugation chamber configured so as to be sandwiched between two opposing members; an air supply unit that supplies air into the centrifugation chamber and generates a swirl flow; a raw material supply unit that supplies raw-material powder into the swirl flow; a fine powder recovery unit having an opening part through which air that includes fine powder classified within the centrifugation chamber is ejected to outside of the centrifugation chamber; a coarse powder recovery unit provided to the outer edge part of the centrifugation chamber, for ejecting classified coarse powder to outside of the centrifugation chamber; and an annular slit provided to at least one of the members that constitute the centrifugation chamber, the slit being provided in a region between the center part of the centrifugation chamber and the outer edge part.

Claims20

Dependent claims

1-8. (canceled)

A powder classifying apparatus classifying raw material powder having a particle size distribution into fine powder and coarse powder, the apparatus comprising:

a centrifugal chamber of disc shape constituted of a space formed between two opposed members;
a gas supply section configured to supply gas into the centrifugal chamber to generate a whirling stream;
a raw material supply section configured to supply the raw material powder to the whirling stream generated in the centrifugal chamber;
a fine powder collecting section that is disposed in a central portion of one member of the two opposed members forming the centrifugal chamber, communicates with the centrifugal chamber, and has an opening portion used to discharge gas containing the fine powder separated through classification in the centrifugal chamber to an outside of the centrifugal chamber;
a coarse powder collecting section that is disposed at an outer edge portion of the centrifugal chamber on a side of the other member of the two opposed members, communicates with the centrifugal chamber, and is configured to discharge the coarse powder separated through classification in the centrifugal chamber to the outside of the centrifugal chamber, the other member being opposed to the one member provided with the fine powder collecting section across the centrifugal chamber;
an annular slit that is provided in at least one of the two opposed members forming the centrifugal chamber in a region between the central portion of the centrifugal chamber and the outer edge portion of the centrifugal chamber, communicates with the centrifugal chamber, and is configured to discharge gas in the centrifugal chamber to the outside of the centrifugal chamber;
a first wall portion of cylindrical shape disposed at the opening portion of the centrifugal chamber to project in the centrifugal chamber, the opening portion being formed from a fine powder collecting pipe;
and
a second wall portion of cylindrical shape disposed at the other member of the two opposed members forming the centrifugal chamber to face the first wall portion at a predetermined distance,
wherein the annular slit has an inner diameter larger than an outer diameter of the opening portion.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application

16/651,236Filed 14 Sep 2018

Priority

JP 2017-18691827 Sep 2017

Published

18 Mar 2021

Term ends

Not estimatedThe source records don’t support an estimate.

Classification3 codes

B07B 7/086
Using centrifugal force: generated by the winding course of the gas stream
B07B 7/083
Using centrifugal force: generated by rotating vanes, discs, drums, or brushes
B07B
Separating solids from solids by sieving, screening, sifting or by using gas

Powder classifying apparatus

Life of this patent

Powder classifying apparatus

Life of this patent

Abstract

Claims20