Powder classifying apparatus

摘要

A powder classifying apparatus for classifying powder that has a granularity distribution and recovering fine powder has: a casing provided with two disc-shaped members and a surrounding wall member, a disc-shaped hollow section for classifying powder using a spinning airflow in the interior thereof being formed on the inner side of the casing; at least one powder supply opening for supplying powder into the disc-shaped hollow section; a discharge section for discharging air including fine powder discharged from the disc-shaped hollow section; a recovery unit formed in the thickness-wise center of the surrounding wall member of the casing and provided with a slit-shaped opening for recovering coarse powder discharged from the disc-shaped hollow section; and two air introduction units provided with a plurality of air introduction devices for introducing air into the disc-shaped hollow section in order to form the rotational airflow inside the disc-shaped hollow section.

主权项

1. A powder classifying apparatus for classifying powder having a particle size distribution to collect fine powder having a size not larger than a predetermined particle size, comprising:
a casing including two disk members arranged to be spaced apart at a predetermined interval and a peripheral wall member attached on outer peripheral sides of the two disk members, the casing having therein a disk cavity formed between the two disk members and at an inner side of the peripheral wall member, the disk cavity being a place where the powder is classified by a whirling gas stream generated therein; one or more powder supply ports disposed at an outside of at least one of the two disk members of the casing so as to communicate with an inner side of an outer edge portion of the disk cavity, and configured to supply the powder conveyed by air flow into the disk cavity; a discharge section formed at at least one of the two disk members of the casing so as to communicate with a central portion, in a radial direction, of the disk cavity, and configured to discharge air containing the fine powder to be discharged from the disk cavity; a collecting section formed at a middle portion, in a thickness direction, of the peripheral wall member of the casing so as to communicate with the outer edge portion of the disk cavity, and including a slit-type opening provided to collect coarse powder having a size larger than the predetermined particle size to be discharged from the disk cavity; and two air introducing sections separately provided at opposite sides, in the thickness direction, of the slit-type opening of the peripheral wall member of the casing, each including a plurality of air introducing devices arranged at the peripheral wall member of the casing at the outer edge portion of the disk cavity to extend along tangential directions of the outer edge portion, the plurality of air introducing devices being configured to introduce air into the disk cavity to generate the whirling gas stream in the disk cavity.