JP5078138B2

JP5078138B2 - Centrifugal classifier

Info

Publication number: JP5078138B2
Application number: JP2007216727A
Authority: JP
Inventors: 剛石川; 和久田村
Original assignee: Ashizawa Finetech Ltd
Current assignee: Ashizawa Finetech Ltd
Priority date: 2007-08-23
Filing date: 2007-08-23
Publication date: 2012-11-21
Anticipated expiration: 2027-08-23
Also published as: JP2009045603A

Description

本発明は、遠心分級機に関し、更に詳細には、分級室を形成するケーシング内で、分級流体が外側から内側へと求心方向に流入した後軸方向に貫流する回転分級ホイールを備えた遠心分級機に関するものである。 The present invention relates to a centrifugal classifier, and more particularly, a centrifugal classifier including a rotary classifying wheel in which a classification fluid flows in a centripetal direction from the outside to the inside in a casing forming a classification chamber and flows through in the axial direction. Related to the machine.

上記した種類の遠心分級機の一つとして、特許第３３２６１８８号公報の図２に示されたものが知られており、また実際に使用されている。この特許第３３２６１８８号公報の図２に示された遠心分級機は、図２に示したように、高速回転する回転分級ホイール１００の下側軸方向に僅かな間隙ｅを隔てて、分級された微細な原料粉を分級機外部に排出するための機構の一部である排出部材１０２（回転せずに固定された状態となっている）が配置された（公報では、回転分級ホイール１００に固定はされていないが気密との記載がある）構造となっている。
特許第３３２６１８８号公報 As one of the above-described types of centrifugal classifiers, the one shown in FIG. 2 of Japanese Patent No. 3326188 is known and is actually used. The centrifugal classifier shown in FIG. 2 of Japanese Patent No. 3326188 is classified with a slight gap e in the lower axial direction of the rotating classifying wheel 100 rotating at a high speed, as shown in FIG. A discharge member 102 (fixed without rotating) that is a part of a mechanism for discharging fine raw material powder to the outside of the classifier is disposed (in the publication, fixed to the rotary classification wheel 100) The structure is not airtight but is described as airtight).
Japanese Patent No. 3326188

しかしながら、回転分級ホイールは高速回転させなければならないので、回転駆動軸と軸受けとの間の摩擦で熱を持ち、回転駆動軸が熱膨張で軸方向に伸張するので、上記の間隙ｅの調整が極めて困難であった。 However, since the rotary classification wheel must be rotated at a high speed, heat is generated by friction between the rotary drive shaft and the bearing, and the rotary drive shaft is expanded in the axial direction by thermal expansion. It was extremely difficult.

そこで、本発明は、上記したような、回転分級ホイールの下側軸方向に僅かな間隙を隔てて配置された排出部材を備えず、分級された微細な原料粉の新規な排出構造を備えた遠心分級機を提供することを目的とする。 Therefore, the present invention does not include the discharge member disposed with a slight gap in the lower axial direction of the rotary classification wheel as described above, and includes a novel discharge structure for classified fine raw material powder. An object is to provide a centrifugal classifier.

上記目的は、以下の（１）〜（２）の構成の遠心分級機により達成される。
（１）
竪型分級室１２ａを形成するケーシング１２内で、分級流体が外側から内側へと求心方向に流入した後、軸方向に貫流する回転分級ホイール１４を備えた竪型遠心分級機であって、前記回転分級ホイール１４が、駆動円板１４ａと、これに向かい合う対向円板１４ｂと、これらの駆動円板１４ａと対向円板１４ｂの間に周方向に間隔を開けて配置された複数の羽根部材１４ｃとを備え、前記駆動円板１４ａには、垂直方向に延びる回転駆動軸１６がその下端で固定されており、この回転駆動軸１６は、前記駆動円板１４ａ側から上方所定長が中空軸部１６ａとなっており、この中空軸部１６ａより上方の部分で、フレーム２６に取り付けられたベアリング２８により回転自在に支持され、かくして前記分級回転ホイール１４は懸垂支持状態となっており、前記中空軸部１６ａの内部は回転分級ホイール１４内部に連通しており、該中空軸部１６ａの前記駆動円板１４ａ側の端部とは反対側の端部側の周囲には、微細な分級後粉を分級機外部へ導くための排出口１８が設けられており、前記中空軸部１６ａの排出口１８の周りには、膨張室形成ケースに２０より形成され、一部に排出ノズル２２が連接された円筒形の膨張室２０ａが設けられており、この膨張室２０ａは、前記中空軸１６ａの内部、および該中空軸１６ａの外周部と前記膨張室形成ケース２０下部の円筒形縮径部２０ｂとの間に形成された間隙２４により、前記分級室１２ａに連通されており、前記間隙２４は、その上下方向中央部が該間隙２４の上方部分および下方部分より径が大きく、前記膨張室２０ａは、前記排出口１８からこの膨張室２０ａに入ったガスをここで膨張させ、負圧とし、回転分級ホイール１４側のガスの流れをスムーズにさせるととともに、前記間隙２４の前記上下方向中央部に外部からガスを流入させ、この間隙２４の上下方向中央部から前記上方部分および下方部分を介して前記分級室１２および膨張室２０ａへのガスの流れを作り出し、これによってのみ回転分級ホイール１４および／または回転駆動軸１６とケーシング１２および／または膨張室形成ケースに２０の間のシールを行い、前記分級室１２ａからの分級前原料粉が前記中空軸１６ａの外部を通って前記膨張室２０ａに侵入することを防止し分級前原料粉を再び分級室に戻すようにしたと共に、前記膨張室２０ａからの微細な分級後粉が前記中空軸１６ａ外部を通って前記分級室１２ａに侵入することを防止し微細な分級後粉を再び前記膨張室２０ａに戻すようにしたことを特徴とする遠心分級機。
（２）
前記中空軸部は、回転駆動軸の他の部分より拡径されている上記（１）の遠心分級機。 The object is achieved by a centrifugal classifier having the following configurations (1) to (2).
(1)
In the casing 12 within which forms a vertical classifier chamber 12a, after classifying fluid flows into the in centripetal direction from the outside to the inside, a vertical type centrifugal classifier equipped with a rotary classifier wheel 14 to flow in the axial direction, the A rotating classification wheel 14 includes a driving disk 14a , an opposing disk 14b facing the driving disk 14a, and a plurality of blade members 14c arranged at intervals in the circumferential direction between the driving disk 14a and the opposing disk 14b. A rotary drive shaft 16 extending in the vertical direction is fixed to the drive disk 14a at its lower end, and the rotary drive shaft 16 has a hollow shaft portion with a predetermined upper length from the drive disk 14a side. has a 16a, in the upper part than the hollow shaft portion 16a, is rotatably supported by a bearing 28 attached to the frame 26, thus the classification rotating wheel 14 and suspension support state And Tsu, inside of the hollow shaft portion 16a is communicated with the internal rotary classifier wheel 14, around the end portion side opposite to the drive disk 14a side end portion of the hollow shaft portion 16a is provided with a discharge port 18 for guiding the fine classification after the powder into the classifier outside, around the outlet 18 of the hollow shaft portion 16a is formed from the 20 to the expansion chamber forming case, a part expansion chamber 20a of the cylindrical discharge nozzle 22 is connected is provided with, the expansion chamber 20a, the inside of the hollow shaft 16a, and the outer peripheral portion and the expansion chamber forming casing 20 bottom of the cylinder of the hollow shaft 16a A gap 24 formed between the reduced diameter portion 20b communicates with the classification chamber 12a. The gap 24 has a larger central portion in the vertical direction than the upper and lower portions of the gap 24. , said expansion chamber 20a, the The entering gas from the outlet 18 to the expansion chamber 20a is expanded here, a negative pressure, with the to the flow of rotary classifier wheel 14 side of the gas smoothly, the gas from the outside to the vertical center portion of the gap 24 And a gas flow from the central portion in the vertical direction of the gap 24 to the classification chamber 12 and the expansion chamber 20a through the upper portion and the lower portion is generated, and only by this, the rotation classification wheel 14 and / or the rotation drive Sealing between the shaft 16 and the casing 12 and / or the expansion chamber forming case 20 is performed so that the raw powder before classification from the classification chamber 12a enters the expansion chamber 20a through the outside of the hollow shaft 16a. The raw powder before classification is returned to the classification chamber again, and fine post-classification powder from the expansion chamber 20a passes through the outside of the hollow shaft 16a. The centrifugal classifier is characterized by preventing entry into the classification chamber 12a and returning finely classified powder to the expansion chamber 20a again .
(2)
The centrifugal classifier according to (1), wherein the hollow shaft portion has a diameter larger than that of the other portion of the rotary drive shaft.

本発明の遠心分級機においては、上記したように、回転分級ホイールの下側軸方向に僅かな間隙を隔てて配置された排出部材を使用せずに、分級された微細な原料粉を分級機外部へ導く構造となっているので、上記したような間隙ｅの調整のような精度の必要な調整が必要なく、メンテナンスも容易である。 In the centrifugal classifier of the present invention, as described above, the classified fine raw material powder is classified without using a discharge member arranged with a slight gap in the lower axial direction of the rotating classifying wheel. Since it has a structure that leads to the outside, adjustment that requires high accuracy such as the adjustment of the gap e as described above is unnecessary, and maintenance is easy.

以下、添付した図１を参照しつつ、本発明の実施形態による遠心分級機について詳細に説明する。 Hereinafter, a centrifugal classifier according to an embodiment of the present invention will be described in detail with reference to FIG.

本発明の実施形態による遠心分級機１０は、竪型であって、内部に竪型分級室１２ａを形成するケーシング１２を備えている。このケーシング１２の一部には、図示していないが、分級室１２ａ内に原料粉を導入するための供給ノズルが設けられている。この分級室１２ａ内には、回転分級ホイール１４が配置されている。この回転分級ホイール１４は、原料粉を含む分級流体を外側から内側へと求心方向に流入したさせた後、軸方向に貫流させる作用をなす。 A centrifugal classifier 10 according to an embodiment of the present invention is a saddle type and includes a casing 12 that forms a saddle type classification chamber 12a therein. Although not shown, a part of the casing 12 is provided with a supply nozzle for introducing the raw material powder into the classification chamber 12a. A rotation classification wheel 14 is disposed in the classification chamber 12a. The rotating classifying wheel 14 functions to cause the classifying fluid containing the raw material powder to flow in the centripetal direction from the outside to the inside and then to flow in the axial direction.

上記回転分級ホイール１４は、駆動円板１４ａと、これに向かい合う対向円板１４ｂと、これらの駆動円板１４ａと対向円板１４ｂの間に周方向に間隔を開けて配置された複数の羽根部材１４ｃとを備えている。これらの複数の羽根部材１４ｃは、駆動円板１４ａと対向円板１４ｂに固定されている。 The rotating classifying wheel 14 includes a driving disk 14a, an opposing disk 14b facing the driving disk 14a, and a plurality of blade members disposed between the driving disk 14a and the opposing disk 14b at intervals in the circumferential direction. 14c. The plurality of blade members 14c are fixed to the drive disk 14a and the counter disk 14b.

上記駆動円板１４ａには、その中心部に垂直方向に延びる回転駆動軸１６が固定されている。この回転駆動軸１６は、ケーシング１２を貫通して上方に延びており、端部が図示しない駆動用プーリー等の周知の駆動機構を介して電動モータ等の駆動源に接続されている。 A rotary drive shaft 16 extending in the vertical direction is fixed to the drive disc 14a. The rotary drive shaft 16 extends through the casing 12 and has an end connected to a drive source such as an electric motor via a known drive mechanism such as a drive pulley (not shown).

上記回転駆動軸１６は、上記駆動円板１４ａ側から上方所定長が中空軸部１６ａとなっており、この中空軸部１６ａの内部は回転分級ホイール１４内部に連通している。このため、上記駆動円板１４ａの中心部には、円形の開口１４ｄが形成されている。上記中空軸部１６ａの上記駆動円板１４ａ側の端部とは反対側の端部側の周囲には、微細な分級後粉を分級機１０外部へ導くための排出口１８が設けられている。この排出口１８は、縦長のスリットで周方向に間隔を開けて複数個設けられていることが好ましい。 The rotary drive shaft 16 has a hollow shaft portion 16a having a predetermined upper length from the drive disk 14a side, and the inside of the hollow shaft portion 16a communicates with the inside of the rotation classification wheel 14. For this reason, a circular opening 14d is formed at the center of the drive disk 14a. A discharge port 18 is provided around the end of the hollow shaft portion 16a opposite to the end on the drive disc 14a side to guide the finely classified powder to the outside of the classifier 10. . It is preferable that a plurality of the discharge ports 18 be provided at intervals in the circumferential direction with vertically long slits.

上記中空軸部１６ａの排出口１８の周りには、膨張室形成ケース２０により円筒形の膨張室２０ａを設け、この膨張室２０ａの一部には、排出ノズル２２が連接されている。
この膨張室２０ａは、前記中空軸１６ａの内部、および該中空軸１６ａの外周部と前記膨張室形成ケース２０下部（ケーシング１２との接合部）の円筒形縮径部２０ｂとの間に形成された間隙２４により、前記分級室１２ａに連通されている。
前記膨張室２０ａは、前記排出口１８からこの膨張室２０ａに入ったガスをここで膨張させ、負圧とし、回転分級ホイール１４側のガスの流れをスムーズにさせる。
前記この膨張室２０ａは、前記排出口１８から前記膨張室２０ａに入った空気をここで膨張させ、負圧とし、回転分級ホイール１４側のガスの流れをスムーズにする。
以上の構造により、微細な分級後粉は、回転分級ホイール１４内部から、中空軸部１６ａ、排出口１８、排出ノズル２２を通って分級機外部に排出される。 A cylindrical expansion chamber 20a is provided around the discharge port 18 of the hollow shaft portion 16a by an expansion chamber forming case 20, and a discharge nozzle 22 is connected to a part of the expansion chamber 20a.
The expansion chamber 20a is formed inside the hollow shaft 16a and between the outer peripheral portion of the hollow shaft 16a and the cylindrical reduced diameter portion 20b at the lower portion of the expansion chamber forming case 20 (joining portion with the casing 12). The gap 24 communicates with the classification chamber 12a.
The expansion chamber 20a expands the gas that has entered the expansion chamber 20a from the discharge port 18 to create a negative pressure, and smoothes the gas flow on the rotating classification wheel 14 side .
Wherein the expansion chamber 20a inflates here air entering into the expansion chamber 20a from the discharge port 18, a negative pressure, the flow of the rotary classifier wheel 14 side of the gas smoothly.
With the above structure, the fine post-classification powder is discharged from the inside of the rotary classification wheel 14 to the outside of the classifier through the hollow shaft portion 16a, the discharge port 18, and the discharge nozzle 22.

前記間隙２４は、その上下方向中央部が該間隙２４の上方部分および下方部分より径が大きく、前記縮径部２０ｂには、ガス（一般に空気）導入通路２０ｃが形成されており、このガス導入通路２０ｃを介して、該間隙２４の前記上下方向中央部に外部からガスを流入させ、この間隙２４の上下方向中央部から前記上方部分および下方部分を介して前記分級室１２および膨張室２０ａへのガスの流れを作り出し、これによってのみ回転分級ホイール１４および／または回転駆動軸１６とケーシング１２および／または膨張室形成ケースに２０の間のシールを行っている。すなわち、本発明では、回転駆動軸１６の外周部と前記膨張室形成ケース２０下部の円筒形縮径部２０ｂとの間に形成された間隙２４でシールを行い、前記分級室１２ａからの粗い粉を含む分級前原料粉が前記中空軸１６ａの外部を通って前記膨張室２０ａに侵入することを防止し分級前原料粉を再び分級室に戻すようにしたと共に、前記膨張室２０ａからの微細な分級後粉が前記中空軸１６ａ外部を通って前記分級室１２ａに侵入することを防止し微細な分級後粉を再び前記膨張室２０ａに戻すようにした。 The central portion of the gap 24 is larger in diameter than the upper and lower portions of the gap 24, and a gas (generally air) introduction passage 20c is formed in the reduced diameter portion 20b. Gas is introduced from the outside into the vertical center of the gap 24 through the passage 20c, and from the central part in the vertical direction of the gap 24 to the classification chamber 12 and the expansion chamber 20a via the upper and lower portions. Only by this, a seal between the rotary classification wheel 14 and / or the rotary drive shaft 16 and the casing 12 and / or the expansion chamber forming case is provided. That is, in the present invention, sealing is performed in the gap 24 formed between the outer peripheral portion of the rotary drive shaft 16 and the cylindrical reduced diameter portion 20b below the expansion chamber forming case 20 , and the coarse powder from the classification chamber 12a. The pre-classification raw material powder is prevented from entering the expansion chamber 20a through the outside of the hollow shaft 16a, and the pre-classification raw material powder is returned to the classification chamber again, and the fine powder from the expansion chamber 20a The fine powder after classification is prevented from entering the classification chamber 12a through the outside of the hollow shaft 16a, and the fine powder after classification is returned to the expansion chamber 20a again.

上記回転駆動軸１６においては、上記中空軸部１６ａは、該回転駆動軸の他の部分より拡径されている。換言すれば、上記回転駆動軸１６は、中空軸部１６ａより上の部分が、中実な軸で、縮径されている。回転駆動軸１６は、この中実な軸の部分で、フレーム２６に取り付けられたベアリング２８により懸垂状態で回転自在に支持されている。すなわち、回転駆動軸１６ひいては回転分級ホイール１４は、吊り下げられた状態で回転自在に支持されている。このフレーム２６の下部は、上記膨張室形成ケース２０の上部と接続している。
回転駆動軸１６の中実な軸の部分とフレーム２６との間には、軸封シール３０が配置されている。 In the rotary drive shaft 16, the hollow shaft portion 16a has a diameter larger than that of the other portion of the rotary drive shaft. In other words, the rotational drive shaft 16 is reduced in diameter by a solid shaft at a portion above the hollow shaft portion 16a. The rotary drive shaft 16 is a solid shaft portion, and is rotatably supported in a suspended state by a bearing 28 attached to the frame 26. That is, the rotation drive shaft 16 and the rotation classification wheel 14 are rotatably supported in a suspended state. The lower part of the frame 26 is connected to the upper part of the expansion chamber forming case 20.
A shaft seal 30 is disposed between the solid shaft portion of the rotary drive shaft 16 and the frame 26.

以上の構造の遠心分級機１０においては、１００００ｒｐｍ／ホイル径φ１００程度の高速回転で回転分級ホイール１４を回転させた状態で、図示していない供給ノズルから原料粉を分級室１２ａ内部に導入し、分級された微細な原料粉を回転分級ホイール１４内部から、中空軸部１６ａ、排出口１８、排出ノズル２２を通して分級機外部に排出して、分級を完了する。
本発明の遠心分級機においては、従来機のように、回転分級ホイールの下側軸方向に僅かな間隙を隔てて配置された排出部材を使用せずに、分級された微細な原料粉を分級機外部へ導く構造となっているので、精度の必要な調整が必要なく、メンテナンスも容易である。 In the centrifugal classifier 10 having the above structure, the raw material powder is introduced into the classification chamber 12a from a supply nozzle (not shown) in a state where the rotary classification wheel 14 is rotated at a high speed of about 10,000 rpm / foil diameter φ100. The classified fine raw material powder is discharged from the inside of the rotary classification wheel 14 to the outside of the classifier through the hollow shaft portion 16a, the discharge port 18, and the discharge nozzle 22 to complete the classification.
In the centrifugal classifier of the present invention, unlike the conventional machine, the classified fine raw material powder is classified without using a discharge member arranged with a slight gap in the lower axial direction of the rotary classifying wheel. Since it has a structure that leads to the outside of the machine, adjustment that requires accuracy is not required, and maintenance is easy.

本発明の実施形態による遠心分級機の要部の断面図である。It is sectional drawing of the principal part of the centrifugal classifier by embodiment of this invention. 従来の遠心分級機の一例を示す断面図である。It is sectional drawing which shows an example of the conventional centrifugal classifier.

１０遠心分級機
１２ケーシング
１２ａ分級室
１４回転分級ホイール
１４ａ駆動円板
１４ｂ対向円板
１４ｃ羽根部材
１６回転駆動軸
１６ａ中空軸部
１８排出口
２０膨張室形成ケース
２０ａ膨張室
２０ｂ縮径部
２０ｃガス導入通路
２２排出ノズル
２４間隙
２６フレーム
２８ベアリング
３０軸封シール DESCRIPTION OF SYMBOLS 10 Centrifugal classifier 12 Casing 12a Classification chamber 14 Rotation classification wheel 14a Drive disk 14b Opposite disk 14c Blade member 16 Rotation drive shaft 16a Hollow shaft part 18 Outlet 20 Expansion chamber formation case 20a Expansion chamber 20b Reduced diameter part 20c Gas introduction Passage 22 Discharge nozzle 24 Gap 26 Frame 28 Bearing 30 Shaft seal

Claims

In the casing 12 within which forms a vertical classifier chamber 12a, after classifying fluid flows into the in centripetal direction from the outside to the inside, a vertical type centrifugal classifier equipped with a rotary classifier wheel 14 to flow in the axial direction, the A rotating classification wheel 14 includes a driving disk 14a , an opposing disk 14b facing the driving disk 14a, and a plurality of blade members 14c arranged at intervals in the circumferential direction between the driving disk 14a and the opposing disk 14b. A rotary drive shaft 16 extending in the vertical direction is fixed to the drive disk 14a at its lower end, and the rotary drive shaft 16 has a hollow shaft portion with a predetermined upper length from the drive disk 14a side. has a 16a, in the upper part than the hollow shaft portion 16a, is rotatably supported by a bearing 28 attached to the frame 26, thus the classification rotating wheel 14 and suspension support state And Tsu, inside of the hollow shaft portion 16a is communicated with the internal rotary classifier wheel 14, around the end portion side opposite to the drive disk 14a side end portion of the hollow shaft portion 16a is provided with a discharge port 18 for guiding the fine classification after the powder into the classifier outside, around the outlet 18 of the hollow shaft portion 16a is formed from the 20 to the expansion chamber forming case, a part expansion chamber 20a of the cylindrical discharge nozzle 22 is connected is provided with, the expansion chamber 20a, the inside of the hollow shaft 16a, and the outer peripheral portion and the expansion chamber forming casing 20 bottom of the cylinder of the hollow shaft 16a A gap 24 formed between the reduced diameter portion 20b communicates with the classification chamber 12a. The gap 24 has a larger central portion in the vertical direction than the upper and lower portions of the gap 24. , said expansion chamber 20a, the The entering gas from the outlet 18 to the expansion chamber 20a is expanded here, a negative pressure, with the to the flow of rotary classifier wheel 14 side of the gas smoothly, the gas from the outside to the vertical center portion of the gap 24 And a gas flow from the central portion in the vertical direction of the gap 24 to the classification chamber 12 and the expansion chamber 20a through the upper portion and the lower portion is generated, and only by this, the rotation classification wheel 14 and / or the rotation drive Sealing between the shaft 16 and the casing 12 and / or the expansion chamber forming case 20 is performed so that the raw powder before classification from the classification chamber 12a enters the expansion chamber 20a through the outside of the hollow shaft 16a. The raw powder before classification is returned to the classification chamber again, and fine post-classification powder from the expansion chamber 20a passes through the outside of the hollow shaft 16a. The centrifugal classifier is characterized by preventing entry into the classification chamber 12a and returning finely classified powder to the expansion chamber 20a again .

The centrifugal classifier according to claim 1, wherein the hollow shaft portion has a larger diameter than other portions of the rotary drive shaft.