JPH0661535B2 - Powder classifier - Google Patents
Powder classifierInfo
- Publication number
- JPH0661535B2 JPH0661535B2 JP61079262A JP7926286A JPH0661535B2 JP H0661535 B2 JPH0661535 B2 JP H0661535B2 JP 61079262 A JP61079262 A JP 61079262A JP 7926286 A JP7926286 A JP 7926286A JP H0661535 B2 JPH0661535 B2 JP H0661535B2
- Authority
- JP
- Japan
- Prior art keywords
- classification
- rotor
- powder
- opening
- casing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
- B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
- B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes
Landscapes
- Combined Means For Separation Of Solids (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は遠心力と空気流による抗力とのバランスを利用
して粉体を分級する粉体分級機に関する。TECHNICAL FIELD The present invention relates to a powder classifier for classifying powder by utilizing the balance between centrifugal force and drag force caused by air flow.
（従来技術） 従来種々の粉体分級法が知られているが、その１つに、
粉体粒子に遠心力を与えるとともに空気流による抗力を
与え粒子の粘性と粒径とからきまるバランス点を変えて
分級を行う空気分級法が知られている（たとえば特公昭
５７−１１２６９号）。(Prior Art) Conventionally, various powder classification methods are known, and one of them is
An air classification method is known, in which a centrifugal force is applied to powder particles and a drag force due to an air flow is applied to change the balance point determined by the viscosity and particle size of the particles to perform classification (for example, Japanese Patent Publication No. 57-11269).
この種の空気分級機において分級精度を向上させ小粒径
の粒子まで分級するには強制渦流式分級機が多く用いら
れる傾向にあるが、近年分級精度の向上といわゆるサブ
ミクロン（１μｍ以下）の粉体分級の要求が高まる中で
この要求に答えて分級点を下げるためには基本的には空
気量を低くし分級ロータの回転数を高める必要がある。In order to improve the classification accuracy and classify even small particles in this type of air classifier, there is a tendency that a forced vortex classifier is often used. In recent years, however, the classification accuracy is improved and so-called submicron (1 μm or less) In order to meet this demand and lower the classification point as the demand for powder classification increases, it is basically necessary to reduce the air amount and increase the rotation speed of the classification rotor.
ところが分級ロータの回転数を上げることは機構的に困
難を伴なうため上限値に限界があり、運転に必要なエネ
ルギー消費量も増す。一方、空気量を下げると分級室内
における粒子の流れに円滑さを欠き分級性能が低下す
る。However, it is mechanically difficult to increase the rotation speed of the classification rotor, so that the upper limit value is limited and the energy consumption required for operation also increases. On the other hand, when the amount of air is reduced, the flow of particles in the classification chamber lacks smoothness and the classification performance deteriorates.
（発明の目的および構成） 本発明は上記の点にかんがみてなされたもので、低分級
点が得られるような高回転、低風量領域でも分級精度を
上げ分級効率を向上することを目的とし、この目的を達
成するために、分級された粉体と空気流との混合流がケ
ーシング内に流出する流出口近傍に混合流を絞るような
形状のデフューザを設けたものである。(Object and Structure of the Invention) The present invention has been made in view of the above points, and it is an object of the present invention to improve classification accuracy by increasing classification accuracy even in a high rotation and low air volume region where a low classification point can be obtained. In order to achieve this object, a diffuser having a shape for narrowing the mixed flow of the classified powder and the air flow is provided in the vicinity of the outlet where the mixed flow flows into the casing.
（実施例） 以下本発明を図面に基づいて説明する。(Example) The present invention will be described below with reference to the drawings.
第１図は本発明による本発明による粉体分級機の一実施
例の縦断面図、第２図は第１図に示した粉体分級機の分
級ロータの一部を切り欠いて示す平面図である。FIG. 1 is a vertical sectional view of an embodiment of the powder classifier according to the present invention, and FIG. 2 is a plan view showing a part of a classification rotor of the powder classifier shown in FIG. Is.
図において、１は上面中心部に粉体供給装置（図示せ
ず）と連結される粉体投入口２ａを有し、かつ周側部に
空気導入口２ｂを備えたケーシングで、このケーシング
１内には、円周部から軸心部下方に連通する空胴部３を
有する円盤状の分級ロータ４が配置され、この分級ロー
タ４はケーシング１の縦方向の軸心部に軸受５、５によ
り垂直に取り付けた回転軸６の上端に一端に固着されて
いる。また上記分級ロータ４の開放周縁部の空胴部３内
には、第２図に示すように円周方向に等間隔に配列した
多数の外方分級羽根７を放射状に形成し、かつこの外方
分級羽根７の内側にあって、分級ロータ４の半径方向に
対し２段となるよう外方分級羽根７と対向する多数の内
方分級羽根８を放射状に形成するとともに、この外方お
よび内方分級羽根７、８間に所望の間隙９を形成し、さ
らにこの間隙９と対向する分級ロータ４の上板４ａには
空胴部３内と連通するリング上の粉体導入口１０を形成
する。また、このような分級羽根構造にすることによっ
て外方分級羽根７および内方分級羽根８の部分に粗粉側
および微粉側に対応する強制渦の広い分級室１１（７お
よび８）を構成する。In the figure, reference numeral 1 is a casing having a powder feeding port 2a connected to a powder feeding device (not shown) at the center of the upper surface and an air introducing port 2b at the peripheral side. Is provided with a disk-shaped classification rotor 4 having a cavity 3 that communicates from the circumferential portion to the lower portion of the axial center portion. The classification rotor 4 is mounted on the longitudinal axial portion of the casing 1 by bearings 5 and 5. It is fixed at one end to the upper end of the rotating shaft 6 which is vertically attached. In addition, as shown in FIG. 2, a large number of outer classification blades 7 arranged at equal intervals in the circumferential direction are radially formed in the cavity 3 at the open peripheral edge of the classification rotor 4, and the outside A large number of inner classification blades 8 are formed radially inside the direction classification blade 7 and face the outer classification blade 7 so as to form two stages in the radial direction of the classification rotor 4, and the outer and inner A desired gap 9 is formed between the direction classification blades 7 and 8, and a powder introduction port 10 on the ring communicating with the inside of the cavity 3 is formed in the upper plate 4a of the classification rotor 4 facing the gap 9. To do. Further, by adopting such a classification blade structure, the classification chambers 11 (7 and 8) having a wide forced vortex corresponding to the coarse powder side and the fine powder side are formed in the outer classification blade 7 and the inner classification blade 8. .
また、上記分級ロータ４の分級羽根７、８と対向する下
面には多数の補助羽根１２が円周方向に等間隔に配列し
て放射状に設けられており、分級ロータ４が回転したと
き、補助羽根１２により空気に回転方向の流れを与え、
旋回した状態で上記分級室１１方向へ導入するようにし
てある。１３は上記分級ロータ４の外周囲に形成した空
所であり、この空所１３と連通する粗粉取出口１４がケ
ーシング１に形成されている。In addition, a large number of auxiliary blades 12 are radially arranged on the lower surface of the classification rotor 4 facing the classification blades 7 and 8 at equal intervals in the circumferential direction. The blades 12 give the air a flow in the direction of rotation,
It is adapted to be introduced in the direction of the classification chamber 11 in a swirled state. Reference numeral 13 denotes a void formed on the outer periphery of the classification rotor 4, and a coarse powder outlet 14 communicating with the void 13 is formed in the casing 1.
１５は上記分級ロータ４の上板４ａとケーシング１の上
板下面間に形成した上記粉体投入口２ａと分級ロータ４
のリング状粉体導入口１０とを連通させる空所で、この
空所１５に位置する分級ロータ４の上板４ａの中央部側
には軸心部から外周方向に延びる多数の粉体分散羽根１
６を放射状に設け、かつこの分散羽根１６の半径方向の
終端とリング状粉体導入口１０間の分級ロータ４の上板
４ａ上を平坦にして、この平坦面とこれに対向するケー
シング１の内面間に粉体を二次分散させる分散間隙１７
を形成する。Reference numeral 15 denotes the powder charging port 2a formed between the upper plate 4a of the classification rotor 4 and the lower surface of the upper plate of the casing 1 and the classification rotor 4
Of the upper surface of the classifying rotor 4 located in the void 15 and a plurality of powder dispersion blades extending from the axial center portion in the outer peripheral direction. 1
6 are provided radially, and the upper plate 4a of the classification rotor 4 between the radial end of the dispersion blade 16 and the ring-shaped powder introduction port 10 is flattened, and this flat face and the casing 1 facing it are flattened. Dispersion gap 17 for secondary dispersion of powder between inner surfaces
To form.
１８は上記分級ロータ４とほぼ同様円周部から軸心部に
連通する空胴部１９を有する円盤状のバランスロータ
で、このバランスロータ１８は分級ロータ４と配置状態
が対称となるように、かつ空胴部１９が分級ロータ４の
空胴部３と連通するようにしてケーシング１内の回転軸
６に一体に固着するとともに、バランスロータ１８の開
口周縁部の空胴部１９内には多数の羽根２０を放射状に
設け、さらにこのバランスロータ１８に一体的かつ気密
に取付ける。なおこの渦巻きケーシング２１には図示し
ないサイクロン、バックフィルタ等の捕集装置が連結さ
れている。Reference numeral 18 is a disk-shaped balance rotor having a cavity portion 19 that communicates from the circumferential portion to the axial center portion, which is substantially the same as the classification rotor 4. The balance rotor 18 is arranged symmetrically with the classification rotor 4. In addition, the cavity portion 19 is integrally fixed to the rotary shaft 6 in the casing 1 so that the cavity portion 19 communicates with the cavity portion 3 of the classification rotor 4, and a large number of holes are provided in the cavity portion 19 at the peripheral edge of the opening of the balance rotor 18. Blades 20 are provided in a radial pattern, and are integrally and airtightly attached to the balance rotor 18. A collecting device such as a cyclone or a back filter (not shown) is connected to the spiral casing 21.
渦巻きケーシング２１には、第３図（イ）に示すよう
に、デフューザ２１ａが内方に伸びるように設けられて
いる。デフューザ２１ａの形状は第３図（イ）、
（ロ）、（ハ）、（ニ）に示すように種々考えられる
が、いずれも渦巻きケーシング２１の内側の壁から外側
の壁に向って水平またはやや上向きに伸び、デフューザ
２１ａの先端と外側壁との間で微粉粒子を含む空気流を
絞り込んで整流し均一化するように機能する構造となっ
ている。As shown in FIG. 3 (a), the spiral casing 21 is provided with a diffuser 21a so as to extend inward. The shape of the diffuser 21a is shown in FIG.
Although there are various possibilities as shown in (b), (c), and (d), all of them extend horizontally or slightly upward from the inner wall of the spiral casing 21 toward the outer wall, and the tip of the diffuser 21a and the outer wall. The structure is such that the air flow containing the fine powder particles is squeezed between and to rectify and uniformize the air flow.
次に上記のように構成された本発明による分級機の動作
について説明する。Next, the operation of the classifier according to the present invention configured as described above will be described.
まず、分級ロータ４およびバランスロータ１８を図示し
ない電動機により所望の速度で回転させ、バランスロー
タ１８の吸引作用および外部に連結されたブロアー（図
示せず）で分級機内部に負圧の空気導入口２ｂから流入
された空気は補助羽根１２によって回転方向の流れに変
換され旋回した状態で空所１３から分級室１１に入り、
そして分級室１１では分級羽根７、８により分級ロータ
４と同一周速の気流となる。これと同時に分級室１１で
はバランスロータ１８およびブロアーで吸引される形式
であるため、分級室１１の円周面での空気は半径方向の
流れとなる。また、バランスロータ１８を通過した空気
は渦巻きケーシング２１内に吹出されるが、このときデ
フューザ２１ａで絞り込まれて流速が均一化されるため
分級効率が向上する。この点は後述する実験結果から明
らかになろう。この時の空気の流れを第１図および第３
図に矢印で示す。First, the classifying rotor 4 and the balance rotor 18 are rotated at a desired speed by an electric motor (not shown), and the suction action of the balance rotor 18 and a blower (not shown) connected to the outside are used to introduce a negative pressure air into the classifier. The air that has flowed in from 2b is converted into a flow in the rotational direction by the auxiliary blade 12 and enters the classification chamber 11 from the void 13 in a swirled state,
In the classification chamber 11, the classification vanes 7 and 8 form an air flow having the same peripheral speed as the classification rotor 4. At the same time, since air is sucked by the balance rotor 18 and the blower in the classifying chamber 11, the air on the circumferential surface of the classifying chamber 11 flows in the radial direction. Further, the air that has passed through the balance rotor 18 is blown out into the spiral casing 21, but at this time, the diffuser 21a is narrowed down and the flow velocity is made uniform, so that the classification efficiency is improved. This point will become clear from the experimental results described later. The air flow at this time is shown in Figs.
Indicated by arrows in the figure.
この状態で、粉体投入口２ａから投入された粉体原料は
空気流に乗り、各分散羽根１６間を通過する間に間に分
級ロータ４の軸心を中心とする放射方向にほぼ均一に分
割され、粉体の一次分散が行われる。そして、分散羽根
１６の終端から出た粉体は分級ロータ４の回転に伴い分
散羽根配列円のほぼ接線方向に放射され、分散間隙１７
内で二次分散される。以上の作用で充分に分散された粉
体はリング状粉体導入口１０を通して分級室１１に供給
されるが、ここで粉体の各粒子は回転流による遠心力 と半径方向の流れによる抗力（３πμＶｒＤｐ）を受け
る。これらの粒子のうち遠心力＞抗力の関係が成り立つ
粗い粒子は分級ロータ４の外周の空所１３内に飛ばさ
れ、粗粉取出口１４よりロータリーバルブ等を用いてエ
アシールした状態で分級機外に取出される。また、遠心
力＜抗力の関係が成り立つ細かい粒子は半径方向の空気
流に乗った状態でバランスロータ１８、渦巻きケーシン
グ２１を介して分級機外に空気輸送され、サイクロン、
バックフイルタ等の捕集機により捕集される。In this state, the powder raw material charged through the powder charging port 2a rides on the air flow, and while passing between the dispersion blades 16, the powder raw material becomes substantially uniform in the radial direction around the axis of the classification rotor 4. It is divided and the primary dispersion of the powder is performed. The powder emerging from the end of the dispersion blade 16 is radiated in the tangential direction of the dispersion blade array circle as the classification rotor 4 rotates, and the dispersion gap 17
Is secondarily dispersed within. The powder that has been sufficiently dispersed by the above operation is supplied to the classification chamber 11 through the ring-shaped powder introduction port 10, where each particle of the powder is centrifugal force generated by the rotating flow. And a drag force (3πμV r D p ) due to the radial flow. Of these particles, the coarse particles satisfying the relationship of centrifugal force> drag force are blown into the space 13 on the outer periphery of the classification rotor 4, and are air-sealed from the coarse powder outlet 14 using a rotary valve or the like to the outside of the classifier. Taken out. Further, fine particles that satisfy the relationship of centrifugal force <drag are carried to the outside of the classifier through the balance rotor 18 and the spiral casing 21 while being carried on the air flow in the radial direction, and the cyclone,
It is collected by a collector such as a back filter.
また、上記構成の分級機における分級点の調整は分級ロ
ータ４の回転数あるいは分級室１１の通過風量を変化さ
せることにより行われる。Further, the adjustment of the classification point in the classifier having the above configuration is performed by changing the rotation speed of the classification rotor 4 or the amount of air passing through the classification chamber 11.
なお、上記式における符号は下記の通りである。The symbols in the above equation are as follows.
Ｄｐ：粒子の平均径 ρｐ：粒子の密度 Ｖｏ：円周方向の風速 Ｖｒ：半径方向の風速 Ｒ：分級点の半径距離 μ：空気の粘性係数 第４図はデフューザの効果を示すために行った比較実験
の結果を示す。実験では粉体としてJIS標準粉体１１種
（関東ローム）毎分１時間当り1.68kgの割合で供給し、
空気量は1.0m3/mim、分級ロータの回転数は9500rpmとし
た。D p : Average diameter of particles ρ p : Density of particles V o : Wind velocity in the circumferential direction V r : Wind velocity in the radial direction R: Radial distance of classification point μ: Viscosity coefficient of air Fig. 4 shows the effect of the diffuser The result of the comparison experiment performed for this purpose is shown. In the experiment, 11 kinds of JIS standard powder (Kanto loam) were supplied as powder at a rate of 1.68 kg per minute,
The amount of air was 1.0 m 3 / mim, and the rotation speed of the classification rotor was 9500 rpm.
図は、分級後の粗粉および微粉の粒度分布を頻度分布で
示したものであるが、Ａは粗粉についてデフューザなし
の場合、Ａ′は粗粉についてデフューザを設けた場合、
Ｂは微粉についてデフューザなしの場合、Ｂ′は微粉に
ついてデフューザを設けた場合である。この図からわか
るように、デフューザを設けることによりデフューザが
ない場合に比べて微粉と粗粉の頻度分布のピークどうし
が離れる方向に移動し粗粉と微粉のオーバラップが少な
くなっている。このことは分級効率が向上することを意
味する。The figure shows the particle size distribution of the coarse powder and the fine powder after classification with a frequency distribution. A is a case where no diffuser is provided for the coarse powder, and A'is a case where a diffuser is provided for the coarse powder.
B is the case where no diffuser is provided for fine powder, and B'is the case where a diffuser is provided for fine powder. As can be seen from this figure, the provision of the diffuser causes the peaks of the frequency distribution of the fine powder and the coarse powder to move away from each other as compared with the case without the diffuser, and the overlap between the coarse powder and the fine powder is reduced. This means that the classification efficiency is improved.
（発明の効果） 本発明は、分級ロータの下部に設けたバランスロータを
通して分級ロータから空気を吸引し、このバランスロー
タの外方でケーシング側にバランスロータからの空気を
絞るデフューザを形成したので、分級ロータの回転によ
って粉体に生じる遠心力に抗して分級ロータ内を半径方
向に流れる空気流の流速を分級ロータの円周方向に沿っ
て均一化でき、粉体の分離効率を向上させることができ
た。(Effect of the invention) Since the present invention forms the diffuser that sucks air from the classification rotor through the balance rotor provided in the lower portion of the classification rotor, and restricts the air from the balance rotor to the casing side outside the balance rotor, To improve the separation efficiency of powder by equalizing the flow velocity of the airflow flowing in the radial direction inside the classifying rotor along the circumferential direction of the classifying rotor against the centrifugal force generated on the powder by the rotation of the classifying rotor. I was able to.
第１図は本発明による粉体分級機の一実施例の断面図、
第２図は第１図に示した粉体分級機の部分切欠き平面
図、第３図（イ）、（ロ）、（ハ）、（ニ）はデフュー
ザの異なる例を示す図、第４図は本発明による粉体分級
機を用いて行った分級実験の結果を示すグラフである。 １…ケーシング、２ａ…粉体注入口、２ｂ…空気導入
口、４…分級ロータ、７，８…分級羽根、１６…分散羽
根、１８…バランスロータ、１９…空胴部、２１…渦巻
きケーシングFIG. 1 is a sectional view of an embodiment of a powder classifier according to the present invention,
2 is a partially cutaway plan view of the powder classifier shown in FIG. 1, and FIGS. 3 (a), (b), (c), and (d) are views showing different examples of diffusers, and FIG. The figure is a graph showing the results of a classification experiment conducted using the powder classifier according to the present invention. DESCRIPTION OF SYMBOLS 1 ... Casing, 2a ... Powder injection port, 2b ... Air introduction port, 4 ... Classification rotor, 7,8 ... Classification blade, 16 ... Dispersion blade, 18 ... Balance rotor, 19 ... Cavity part, 21 ... Spiral casing
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭58−26245（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-58-26245 (JP, A)
Claims (1)
ータを回転自在に備え、該分級ロータの回転による遠心
力と空気流のバランスによって粉体を分級する粉体分級
機において、 前記分級ロータは、円周に沿って半径方向に開口する第
１開口部を備え、該分級ロータの下部に、半径方向に開
口する第２開口部を備えたバランスロータを同軸に一体
に固定し、該バランスロータ及び前記分級ロータの第１
開口部と第２開口部とを中心軸近傍で互いに連通させ、
かつ前記第１開口部付近に分級羽根を設け、更に前記分
級ロータ上面の外周近傍に粉体導入口を形成し、 前記ケーシングは、上面中央に前記粉体導入口に連通す
る粉体投入口を有し、前記第１開口部の側方に粗粉取出
口、及び空気導入口を連結し、前記第２開口部の半径方
向外方に該第２開口部から前記ケーシング内に流出する
空気を絞るデフューザを有することを特徴とする粉体分
級機。1. A powder classifier that rotatably includes a classifying rotor having a vertical rotation axis in a casing, and classifies powder by the balance of centrifugal force and air flow due to the rotation of the classifying rotor, wherein the classifying rotor is A balance rotor having a first opening opening in the radial direction along the circumference, and a second opening opening in the radial direction at the lower part of the classification rotor, coaxially integrally fixed to the balance rotor; And the first of the classification rotor
The opening and the second opening are communicated with each other near the central axis,
Moreover, a classification blade is provided near the first opening, and a powder introduction port is formed near the outer periphery of the upper surface of the classification rotor, and the casing has a powder introduction port communicating with the powder introduction port at the center of the upper surface. Having a coarse powder outlet and an air inlet connected to the side of the first opening, air flowing out of the second opening into the casing is radially outward of the second opening. A powder classifier having a squeezing diffuser.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61079262A JPH0661535B2 (en) | 1986-04-08 | 1986-04-08 | Powder classifier |
| KR1019870003268A KR940002840B1 (en) | 1986-04-08 | 1987-04-07 | Powdered-body sorter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61079262A JPH0661535B2 (en) | 1986-04-08 | 1986-04-08 | Powder classifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62237978A JPS62237978A (en) | 1987-10-17 |
| JPH0661535B2 true JPH0661535B2 (en) | 1994-08-17 |
Family
ID=13684940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61079262A Expired - Lifetime JPH0661535B2 (en) | 1986-04-08 | 1986-04-08 | Powder classifier |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH0661535B2 (en) |
| KR (1) | KR940002840B1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100646847B1 (en) * | 2005-07-07 | 2006-11-23 | 주식회사 씨아이티 | Classifier of corpuscle |
-
1986
- 1986-04-08 JP JP61079262A patent/JPH0661535B2/en not_active Expired - Lifetime
-
1987
- 1987-04-07 KR KR1019870003268A patent/KR940002840B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62237978A (en) | 1987-10-17 |
| KR940002840B1 (en) | 1994-04-04 |
| KR870009768A (en) | 1987-11-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |