US 8,714,359 B2Granted

Rotating classifier

AssigneeBabcock-Hitachi Kabushiki Kaisha

InventorsTakashi Aizawa, Akira Baba, Yuki Kondo, Yutaka Takeno, Shinichiro Nomura

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Abstract

[Problem] To provide a rotating classifier which can keep classification performance high and which can prevent blockages caused by biomass and the like. [Means for Resolution] The rotating classifier is characterized in that: comb teeth-like protrusion portions protruding toward a fixed member side are provided on top of rotary classification fins at intervals along the circumferential direction of the rotating classifier fins; a first gap is provided between an upper end portion of each of the comb teeth-like protrusion portions and a lower surface of the fixed member; a second gap formed between a protrusion portion and a protrusion portion adjacent to the protrusion portion is connected to the first gap; and an air stream flowing from the radial outside to the radial inside of the comb teeth-like protrusion portions through the first gap and the second gap is formed due to the rotation of the rotary classification fins.

Claims10

Dependent claims

A rotating classifier comprising:

a classifier motor;
a rotary shaft which is disposed vertically and driven to rotate by the classifier motor;
a fixed member which is disposed horizontally so that the rotary shaft passes through the fixed member;
support members which are shaped annularly in plan view and disposed below the fixed member and at a distance radially outside the rotary shaft;
a large number of rotary classification fins which are fixed to the support members at intervals in a circumferential direction of the support members;
and
connection members which connect the rotary classification fins to the rotary shaft,
the rotary classification fins being rotated by the classifier motor so that a particle group carried by an air flow is classified by centrifugal force of the rotary classification fins;
characterized in that:
comb teeth-like protrusion portions which protrude toward the fixed member side at intervals along a circumferential direction of the rotary classification fins are provided on top of the rotary classification fins;
a first gap is provided between an upper end portion of each of the protrusion portions and a lower surface of the fixed member;
a coarse particle passage suppression ring is attached to the lower surface of the fixed member and located radially outside the protrusion portions so that the protrusion portions are surrounded by the coarse particle passage suppression ring;
the ratio (Hb/Ha) of Hb to Ha is set to be not larger than 0.2 when Ha is the height of each protrusion portion and Hb is the height of the first gap;
and
the ratio (Hc/Ho) of Hc to Ho is set to be not smaller than 1.4 when Ho is the length from the lower surface of the fixed member to a lower surface of the coarse particle passage suppression ring and Hc is the height from a lower end of each protrusion portion to the lower surface of the fixed member.

12 more elements

A rotating classifier comprising:

a classifier motor;
a rotary shaft which is disposed vertically and driven to rotate by the classifier motor;
a fixed member which is disposed horizontally so that the rotary shaft passes through the fixed member;
support members which are shaped annularly in plan view and disposed below the fixed member and at a distance radially outside the rotary shaft;
a large number of rotary classification fins which are fixed to the support members at intervals in a circumferential direction of the support members;
and
connection members which connect the rotary classification fins to the rotary shaft,
the rotary classification fins being rotated by the classifier motor so that a particle group carried by an air flow is classified by centrifugal force of the rotary classification fins;
characterized in that:
comb teeth-like protrusion portions which protrude toward the fixed member side at intervals along a circumferential direction of the rotary classification fins are provided on top of the rotary classification fins;
a first gap is provided between an upper end portion of each of the protrusion portions and a lower surface of the fixed member;
a second gap formed between each of the protrusion portions and another protrusion portion adjacent to the protrusion portion is connected to the first gap;
a turning-direction velocity component having the same direction as a direction of rotation of the rotary classification fins is added to an air stream flowing in gaps of the protrusion portions through the first gap and the second gap due to rotation of the rotary classification fins;
the annular support members have a lower annular support member which connects and fixes lower portions of the rotary classification fins to one another, and an upper annular support member which is disposed above the lower annular support member and connects and fixes the rotary classification fins to one another;
and
the protrusion portions are formed by forming a large number of groove portions in an upper portion of the upper annular support member.

13 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/698,001Filed 11 May 2011
Priority: JP 2010-11211114 May 2010
Published: US 2013/0056396 A17 Mar 2013
Granted: 6 May 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification17 codes

F23G 7/10
Incinerators or other apparatus for consuming industrial waste, e.g. chemicals: of field or garden waste or biomasses
B02C 15/007
Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs: mills with rollers pressed against a rotary…
B02C 23/12
With separator arranged in discharge path of crushing or disintegrating zone: with return of oversize material to crushing or disintegrating zone
B07B 7/083
Using centrifugal force: generated by rotating vanes, discs, drums, or brushes