JP2005270758A - Slurry stirring device - Google Patents

Slurry stirring device Download PDF

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JP2005270758A
JP2005270758A JP2004086177A JP2004086177A JP2005270758A JP 2005270758 A JP2005270758 A JP 2005270758A JP 2004086177 A JP2004086177 A JP 2004086177A JP 2004086177 A JP2004086177 A JP 2004086177A JP 2005270758 A JP2005270758 A JP 2005270758A
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tank
slurry
stirring
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JP4333430B2 (en
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Yoshiyuki Iso
良行 磯
Hiroyuki Uchida
博幸 内田
Masafumi Kawai
理文 河合
Kazuyoshi Chikugo
一義 筑後
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IHI Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a slurry stirring device capable of generating a vertical circulation flow by efficiently utilizing rapid flow generated near an inner wall of a tank and capable of realizing enhancement of performance by preventing precipitation of the slurry. <P>SOLUTION: A stirring means 3 for generating the vertical circulation flow from a tank 2 circumferential flow of the slurry 1 generated with rotation of the tank 2 is inserted/arranged and is constituted of an L shape stirring member 6 comprising a hollow vertical stirring impeller part 4 and a hollow horizontal stirring impeller part 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、スラリー撹拌装置に関するものである。   The present invention relates to a slurry stirring apparatus.

近年、地球温暖化問題の効果的対策としてガスタービンコンバインドサイクル発電が脚光を浴びているが、斯かるガスタービンコンバインドサイクル発電の熱効率向上に必要な耐熱性に優れたタービンブレードは、ロストワックス法等の精密鋳造によって製造されている。   In recent years, gas turbine combined cycle power generation has attracted attention as an effective measure against global warming. However, the turbine blades with excellent heat resistance necessary for improving the thermal efficiency of such gas turbine combined cycle power generation are the lost wax method, etc. Manufactured by precision casting.

ロストワックス法等の精密鋳造によってタービンブレード等の部品を製造する場合、タンク内に貯留されたシリコン等のスラリーを撹拌しつつ、該スラリー中にタービンブレード等の部品モデルを浸漬して鋳型の原型となるモデル型を成形する工程がある。   When manufacturing parts such as turbine blades by precision casting such as the lost wax method, a mold model is prepared by immersing a part model such as turbine blades in the slurry while stirring slurry such as silicon stored in the tank. There is a process of forming a model mold.

通常、タンク内に貯留されたスラリーを撹拌する場合、スラリー中に没入させた撹拌用プロペラを回転駆動することによってスラリーの撹拌を行うことが一般的であるが、前述の如きロストワックス法等の精密鋳造においては、タンク内のスラリー中にタービンブレード等の部品モデルを浸漬して鋳型の原型となるモデル型を製造する関係上、タンク内に撹拌用プロペラを設置することは困難となる。   Usually, when stirring the slurry stored in the tank, it is common to stir the slurry by rotationally driving a stirring propeller immersed in the slurry, such as the lost wax method as described above. In precision casting, it is difficult to install an agitating propeller in the tank because a model model serving as a prototype of a mold is manufactured by immersing a component model such as a turbine blade in slurry in the tank.

このため、従来においては、図４〜図６に示される如く、スラリー１が貯留されたタンク２を上下方向ヘ延びる軸を中心として回転駆動可能に配置すると共に、タンク２内部に、該タンク２の回転に伴って発生するスラリー１のタンク周方向流を利用してスラリー１を撹拌するための撹拌手段３’を挿入配置してなるスラリー撹拌装置が利用されている。   For this reason, conventionally, as shown in FIGS. 4 to 6, the tank 2 in which the slurry 1 is stored is disposed so as to be rotatable about an axis extending in the vertical direction, and the tank 2 is disposed inside the tank 2. A slurry stirring apparatus is used in which stirring means 3 'for stirring the slurry 1 is inserted and disposed using the flow in the tank circumferential direction of the slurry 1 generated with the rotation of the slurry.

前記撹拌手段３’は、タンク２上方からタンク内壁２ａに沿い所要隙間をあけて垂下するよう吊り下げられた中実角柱状の垂直撹拌翼部４’と、該垂直撹拌翼部４’の下端からタンク内底面２ｂに沿い所要隙間をあけて半径方向へ延びるよう配設された中実角柱状の水平撹拌翼部５’とからなるＬ型撹拌部材６’で構成されている。   The stirring means 3 'includes a solid rectangular columnar vertical stirring blade portion 4' suspended from above the tank 2 along the tank inner wall 2a with a required gap, and a lower end of the vertical stirring blade portion 4 '. And an L-shaped stirring member 6 ′ including a solid rectangular columnar horizontal stirring blade portion 5 ′ disposed to extend in the radial direction with a necessary gap along the tank bottom surface 2b.

図４〜図６に示される如き従来のスラリー撹拌装置においては、スラリー１が貯留されたタンク２内部に撹拌手段３’としてのＬ型撹拌部材６’を挿入配置して固定した状態で、タンク２を上下方向ヘ延びる軸を中心として図示していない駆動装置により回転させると、タンク２の回転に伴って発生するスラリー１のタンク周方向流がＬ型撹拌部材６’に衝突して乱され、これにより、スラリー１が撹拌されるようになっている。   In the conventional slurry agitation apparatus as shown in FIGS. 4 to 6, the tank is in a state where an L-type agitation member 6 ′ as the agitation means 3 ′ is inserted and fixed in the tank 2 in which the slurry 1 is stored. 2 is rotated about a shaft extending in the vertical direction by a driving device (not shown), the tank circumferential flow of the slurry 1 generated along with the rotation of the tank 2 collides with the L-type stirring member 6 ′ and is disturbed. As a result, the slurry 1 is stirred.

尚、図４〜図６に示されるような構造のスラリー撹拌装置は、特許文献、非特許文献には見当たらないが、撹拌装置の一般的技術水準を示すものとしては、例えば、特許文献１がある。
特開平１０−１７４８５７号公報 Although the slurry agitation apparatus having the structure as shown in FIGS. 4 to 6 is not found in patent documents and non-patent documents, for example, Patent Document 1 shows a general technical level of the agitation apparatus. is there.
Japanese Patent Laid-Open No. 10-174857

ところで、前記スラリー１は、液相と粉末状粒子の固液二相流体であり、常に均一な状態になるよう撹拌し続ける必要があるが、図４〜図６に示される従来のスラリー撹拌装置では、タンク２の回転に伴って発生するスラリー１のタンク２周方向流は、Ｌ型撹拌部材６’に衝突し、ほとんどがタンク２の半径方向へ偏向されて水平循環流となり、タンク内壁２ａ付近に発生した速い流れが効果的に活用できておらず、しかも、タンク２の極底部（水平撹拌翼部５’とタンク内底面２ｂとの隙間）において上下方向流が生じにくくなっており、スラリー１の沈殿が懸念されていた。   By the way, the slurry 1 is a solid-liquid two-phase fluid of a liquid phase and powdery particles, and it is necessary to continue stirring so as to be always in a uniform state, but the conventional slurry stirring apparatus shown in FIGS. Then, the tank 2 circumferential flow of the slurry 1 generated along with the rotation of the tank 2 collides with the L-type stirring member 6 ′, most of which is deflected in the radial direction of the tank 2 to become a horizontal circulation flow, and the tank inner wall 2 a. The fast flow generated in the vicinity cannot be effectively used, and the vertical flow is less likely to occur at the very bottom of the tank 2 (the gap between the horizontal stirring blade 5 'and the bottom surface 2b in the tank). There was concern about precipitation of slurry 1.

本発明は、斯かる実情に鑑み、タンク内壁付近に発生した速い流れを効率良く活用して上下方向循環流を生じさせることができ、スラリーの沈殿を防いで性能向上を図り得るスラリー撹拌装置を提供しようとするものである。   In view of such circumstances, the present invention provides a slurry agitation device that can efficiently utilize a fast flow generated in the vicinity of the inner wall of a tank to generate a vertical circulation flow, and can prevent sedimentation of the slurry and improve performance. It is something to be offered.

本発明は、スラリーが貯留されたタンクを上下方向ヘ延びる軸を中心として回転させるスラリー撹拌装置において、
タンク内部に、該タンクの回転に伴って発生するスラリーのタンク周方向流から上下方向循環流を生じさせるための撹拌手段を挿入配置したことを特徴とするスラリー撹拌装置にかかるものである。 The present invention, in a slurry agitator that rotates a tank in which slurry is stored around an axis extending in the vertical direction,
The present invention relates to a slurry agitation apparatus in which a stirring means for generating a vertical circulation flow from a circumferential flow of a slurry generated in accordance with the rotation of the tank is inserted in the tank.

前記スラリー撹拌装置においては、撹拌手段を、タンク上方からタンク内壁に沿い所要隙間をあけて垂下するよう吊り下げられ且つタンク内壁への対向面が開放された中空の垂直撹拌翼部と、該垂直撹拌翼部の下端からタンク内底面に沿い所要隙間をあけて半径方向へ延びるよう配設され且つタンク内底面への対向面が開放された中空の水平撹拌翼部とからなるＬ型撹拌部材で構成することができる。   In the slurry agitating apparatus, the agitating means is suspended from above the tank along the inner wall of the tank so as to hang down with a required gap, and has a hollow vertical agitating blade portion whose open surface facing the inner wall of the tank is open. An L-shaped agitating member comprising a hollow horizontal agitating blade portion which is arranged to extend in the radial direction from the lower end of the agitating blade portion along the bottom surface of the tank with a required gap and is open to the surface facing the bottom surface of the tank Can be configured.

前記Ｌ型撹拌部材は、
タンク内底部におけるタンク内壁付近に沈降したスラリーを取り込むよう水平撹拌翼部の端部に形成された入口開口部と、
該入口開口部から取り込まれたスラリーをタンク内底部中心側へ導くよう水平撹拌翼部の内部下側に形成された下段流路部と、
該下段流路部によりタンク内底部中心側へ導かれたスラリーを折り返してタンク内壁側へ導くよう水平撹拌翼部の内部上側に形成された上段流路部と、
該上段流路部によりタンク内壁側へ導かれたスラリーを上方へ導くよう垂直撹拌翼部の内部に形成された煙突状流路部と、
該煙突状流路部により上方へ導かれたスラリーを放出するよう垂直撹拌翼部の上端部に形成された出口開口部と
を備えるようにすることが有効となる。 The L-shaped stirring member is
An inlet opening formed at the end of the horizontal agitating blade to take in the slurry that has settled near the inner wall of the tank at the bottom of the tank;
A lower flow path portion formed on the inner lower side of the horizontal agitating blade portion so as to guide the slurry taken in from the inlet opening portion to the center side of the inner bottom portion of the tank;
An upper flow path portion formed on the inner upper side of the horizontal agitating blade section so as to fold back the slurry guided to the center side in the tank bottom by the lower flow path section and guide it to the tank inner wall side;
A chimney-like channel part formed inside the vertical stirring blade part to guide the slurry guided to the tank inner wall side by the upper channel part upward,
It is effective to provide an outlet opening formed at the upper end of the vertical stirring blade so as to discharge the slurry guided upward by the chimney-shaped channel.

又、タンクの回転に伴って発生するスラリーのタンク周方向流の上流側に対応する水平撹拌翼部の側面に入口開口部を形成すると共に、タンクの回転に伴って発生するスラリーのタンク周方向流の下流側に対応する垂直撹拌翼部の側面に出口開口部を形成することが望ましい。   In addition, an inlet opening is formed on the side surface of the horizontal agitating blade corresponding to the upstream side of the tank circumferential flow of the slurry generated with the rotation of the tank, and the tank circumferential direction of the slurry generated with the rotation of the tank It is desirable to form an outlet opening on the side of the vertical stirring blade corresponding to the downstream side of the flow.

一方、前記スラリー撹拌装置においては、精密鋳造用鋳型の原型となるモデル型を成形するためのスラリーをタンク内に貯留することができる。   On the other hand, in the slurry agitating device, slurry for forming a model mold as a prototype of a precision casting mold can be stored in a tank.

上記手段によれば、以下のような作用が得られる。   According to the above means, the following operation can be obtained.

スラリーが貯留されたタンク内部に撹拌手段としてのＬ型撹拌部材を挿入配置して固定した状態で、タンクを上下方向ヘ延びる軸を中心として回転させると、タンク内底部におけるタンク内壁付近に沈降したスラリーは、撹拌手段としてのＬ型撹拌部材における水平撹拌翼部の入口開口部から下段流路部に取り込まれてタンク内底部中心側へ導かれ、該下段流路部によりタンク内底部中心側へ導かれたスラリーは、折り返すように上段流路部を流れてタンク内壁側へ導かれ、該上段流路部によりタンク内壁側へ導かれたスラリーは、垂直撹拌翼部の内部に形成された煙突状流路部に流れ込んで上方へ導かれ、該煙突状流路部により上方へ導かれたスラリーは、垂直撹拌翼部の上端部に形成された出口開口部から放出される。   When an L-shaped stirring member as a stirring means is inserted and arranged inside the tank in which the slurry is stored and fixed, when the tank is rotated around an axis extending in the vertical direction, the tank settles near the inner wall of the tank at the bottom of the tank. The slurry is taken into the lower flow path portion from the inlet opening of the horizontal stirring blade portion in the L-shaped stirring member as the stirring means, guided to the center side of the tank bottom, and to the center side of the tank bottom by the lower flow path portion. The guided slurry flows to the inner wall side of the tank through the upper flow path part so as to be folded back, and the slurry guided to the inner wall side of the tank by the upper flow path part is formed in the chimney formed inside the vertical stirring blade part. The slurry that has flowed into the channel-like channel part and led upward and is led upward by the chimney-like channel part is discharged from an outlet opening formed at the upper end of the vertical stirring blade part.

この結果、タンクの回転に伴って発生するスラリーのタンク周方向流は、Ｌ型撹拌部材に衝突し、タンクの半径方向へ偏向されて単に水平循環流となるだけでなく、タンク内壁付近に発生した速い流れが効果的に活用され、上下方向循環流を生じさせることが可能となる。   As a result, the circumferential flow of the slurry generated by the rotation of the tank collides with the L-shaped stirring member and is deflected in the radial direction of the tank to become a horizontal circulation flow, and is generated near the inner wall of the tank. Such a fast flow is effectively utilized, and a vertical circulation flow can be generated.

しかも、前記下段流路部に取り込まれたスラリーの一部が水平撹拌翼部とタンク内底面との隙間から流出しようとすることにより、その流出箇所で大きな下降流が発生するため、タンクの極底部（水平撹拌翼部とタンク内底面との隙間）においても上下方向流が生じ、スラリーが沈殿する心配もない。   In addition, since a part of the slurry taken into the lower flow path portion tries to flow out from the gap between the horizontal stirring blade portion and the bottom surface of the tank, a large downward flow is generated at the outflow portion. Even in the bottom portion (the gap between the horizontal stirring blade portion and the bottom surface in the tank), a vertical flow is generated, and there is no fear that the slurry will settle.

本発明の請求項１〜５記載のスラリー撹拌装置によれば、タンク内壁付近に発生した速い流れを効率良く活用して上下方向循環流を生じさせることができ、スラリーの沈殿を防いで性能向上を図り得るという優れた効果を奏し得る。   According to the slurry agitating device of claims 1 to 5 of the present invention, it is possible to efficiently utilize the fast flow generated in the vicinity of the inner wall of the tank to generate the vertical circulation flow, and to improve the performance by preventing slurry settling. An excellent effect can be achieved.

以下、本発明の実施の形態を添付図面を参照して説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

図１〜図３は本発明を実施する形態の一例であって、図中、図４〜図６と同一の符号を付した部分は同一物を表わしており、基本的な構成は図４〜図６に示す従来のものと同様であるが、本図示例の特徴とするところは、図１〜図３に示す如く、タンク２内部に、該タンク２の回転に伴って発生するスラリー１のタンク２周方向流から上下方向循環流を生じさせるための撹拌手段３を挿入配置した点にある。   1 to 3 show an example of an embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 4 to 6 denote the same components, and the basic configuration is shown in FIGS. Although the same as the conventional one shown in FIG. 6, the feature of this example is that, as shown in FIGS. 1 to 3, the slurry 1 generated along with the rotation of the tank 2 is contained inside the tank 2. The stirring means 3 for generating a vertical circulation flow from the circumferential flow of the tank 2 is inserted and arranged.

本図示例の場合、前記撹拌手段３は、タンク２上方からタンク内壁２ａに沿い所要隙間をあけて垂下するよう吊り下げられ且つタンク内壁２ａへの対向面が開放された中空の垂直撹拌翼部４と、該垂直撹拌翼部４の下端からタンク内底面２ｂに沿い所要隙間をあけて半径方向へ延びるよう配設され且つタンク内底面２ｂへの対向面が開放された中空の水平撹拌翼部５とからなるＬ型撹拌部材６で構成してある。   In the case of the illustrated example, the stirring means 3 is a hollow vertical stirring blade portion suspended from above the tank 2 along the tank inner wall 2a so as to hang down with a required gap and having an open surface facing the tank inner wall 2a. 4 and a hollow horizontal stirring blade portion which is disposed so as to extend in the radial direction from the lower end of the vertical stirring blade portion 4 along the tank inner bottom surface 2b with a required gap therebetween and which has an open surface facing the tank inner bottom surface 2b. 5 and an L-shaped stirring member 6.

前記Ｌ型撹拌部材６は、
タンク２内底部におけるタンク内壁２ａ付近に沈降したスラリー１を取り込むよう水平撹拌翼部５の端部に形成された入口開口部７と、
該入口開口部７から取り込まれたスラリー１をタンク２内底部中心側へ導くよう水平撹拌翼部５の内部下側に形成された下段流路部８と、
該下段流路部８によりタンク２内底部中心側へ導かれたスラリー１を折り返してタンク内壁２ａ側へ導くよう水平撹拌翼部５の内部上側に形成された上段流路部９と、
該上段流路部９によりタンク内壁２ａ側へ導かれたスラリー１を上方へ導くよう垂直撹拌翼部４の内部に形成された煙突状流路部１０と、
該煙突状流路部１０により上方へ導かれたスラリー１を放出するよう垂直撹拌翼部４の上端部に形成された出口開口部１１と
を備えるようにしてある。 The L-shaped stirring member 6 is
An inlet opening 7 formed at the end of the horizontal stirring blade 5 to take in the slurry 1 that has settled near the tank inner wall 2a at the inner bottom of the tank 2,
A lower flow path portion 8 formed on the lower side inside the horizontal stirring blade portion 5 so as to guide the slurry 1 taken in from the inlet opening portion 7 toward the center side of the inner bottom portion of the tank 2;
An upper flow passage portion 9 formed on the upper side of the horizontal agitating blade portion 5 so as to fold back the slurry 1 guided to the center side of the inner bottom portion of the tank 2 by the lower flow passage portion 8 and guide it to the tank inner wall 2a side;
A chimney-like channel part 10 formed inside the vertical stirring blade part 4 so as to guide the slurry 1 guided to the tank inner wall 2a side upward by the upper channel part 9;
And an outlet opening 11 formed at the upper end of the vertical stirring blade portion 4 so as to discharge the slurry 1 guided upward by the chimney-shaped flow passage portion 10.

前記入口開口部７は、タンク２の回転に伴って発生するスラリーのタンク２周方向流の上流側に対応する水平撹拌翼部５の側面に形成し、又、前記出口開口部１１は、タンク２の回転に伴って発生するスラリーのタンク２周方向流の下流側に対応する垂直撹拌翼部４の側面に形成するようにしてある。   The inlet opening 7 is formed on the side surface of the horizontal agitating blade 5 corresponding to the upstream side of the circumferential flow of the slurry generated by the rotation of the tank 2, and the outlet opening 11 is formed in the tank. 2 is formed on the side surface of the vertical agitating blade portion 4 corresponding to the downstream side of the circumferential flow of the slurry in the tank.

次に、上記図示例の作用を説明する。   Next, the operation of the illustrated example will be described.

スラリー１が貯留されたタンク２内部に撹拌手段３としてのＬ型撹拌部材６を挿入配置して固定した状態で、タンク２を上下方向ヘ延びる軸を中心として図示していない駆動装置により回転させると、タンク２内底部におけるタンク内壁２ａ付近に沈降したスラリー１は、撹拌手段３としてのＬ型撹拌部材６における水平撹拌翼部５の入口開口部７から下段流路部８に取り込まれてタンク２内底部中心側へ導かれ、該下段流路部８によりタンク２内底部中心側へ導かれたスラリー１は、折り返すように上段流路部９を流れてタンク内壁２ａ側へ導かれ、該上段流路部９によりタンク内壁２ａ側へ導かれたスラリー１は、垂直撹拌翼部４の内部に形成された煙突状流路部１０に流れ込んで上方へ導かれ、該煙突状流路部１０により上方へ導かれたスラリー１は、垂直撹拌翼部４の上端部に形成された出口開口部１１から放出される。   With the L-shaped stirring member 6 as the stirring means 3 inserted and fixed in the tank 2 in which the slurry 1 is stored, the tank 2 is rotated by a driving device (not shown) around an axis extending in the vertical direction. Then, the slurry 1 settled near the tank inner wall 2a at the inner bottom of the tank 2 is taken into the lower flow path portion 8 from the inlet opening 7 of the horizontal stirring blade portion 5 in the L-type stirring member 6 as the stirring means 3. The slurry 1 guided to the center side of the inner bottom portion 2 and guided to the center side of the inner bottom portion of the tank 2 by the lower flow path portion 8 flows through the upper flow path portion 9 so as to be folded, and is guided to the tank inner wall 2a side. The slurry 1 guided to the tank inner wall 2a side by the upper-stage flow channel portion 9 flows into the chimney-shaped flow channel portion 10 formed inside the vertical stirring blade portion 4 and is guided upward, and the chimney-shaped flow channel portion 10 Led upward by Slurry 1 is released from the outlet opening 11 formed in the upper end of the vertical stirring blade unit 4.

この結果、タンク２の回転に伴って発生するスラリー１のタンク２周方向流は、Ｌ型撹拌部材６に衝突し、タンク２の半径方向へ偏向されて単に水平循環流となるだけでなく、タンク内壁２ａ付近に発生した速い流れが効果的に活用され、上下方向循環流を生じさせることが可能となる。   As a result, the tank 2 circumferential flow of the slurry 1 generated along with the rotation of the tank 2 not only collides with the L-type stirring member 6 but is deflected in the radial direction of the tank 2 to become a horizontal circulation flow. The fast flow generated in the vicinity of the tank inner wall 2a is effectively utilized, and a vertical circulation flow can be generated.

しかも、前記下段流路部８に取り込まれたスラリー１の一部が水平撹拌翼部５とタンク内底面２ｂとの隙間から流出しようとすることにより、その流出箇所で大きな下降流が発生するため、タンク２の極底部（水平撹拌翼部５とタンク内底面２ｂとの隙間）においても上下方向流が生じ、スラリー１が沈殿する心配もない。   Moreover, since a part of the slurry 1 taken into the lower flow path portion 8 tries to flow out from the gap between the horizontal stirring blade portion 5 and the tank bottom surface 2b, a large downward flow is generated at the outflow portion. The vertical flow also occurs at the very bottom of the tank 2 (the gap between the horizontal stirring blade 5 and the tank bottom surface 2b), and there is no fear that the slurry 1 will settle.

こうして、タンク内壁２ａ付近に発生した速い流れを効率良く活用して上下方向循環流を生じさせることができ、スラリー１の沈殿を防いで性能向上を図り得る。   Thus, the fast flow generated in the vicinity of the tank inner wall 2a can be efficiently utilized to generate a vertical circulation flow, and the performance can be improved by preventing the slurry 1 from being precipitated.

先ず、撹拌性能の比較をするため、液相と粉末状粒子の固液二相流体であるスラリー１が貯留された高さＨ＝１［ｍ］、直径Ｄ＝１［ｍ］のタンク２を回転速度ω＝２０［ｒｐｍ］で回転させた場合に、タンク２全体でのスラリー１の鉛直方向上昇流における最大速度並びに平均速度を算出し、定量的に比較を行った。解析で得られたタンク２全体における鉛直方向上昇速度｜ｗ+｜（速度成分ｗの正の値のみ）の最大速度｜ｗ+｜max並びに平均速度｜ｗ+｜aveを［表１］にまとめる。 First, in order to compare the stirring performance, a tank 2 having a height H = 1 [m] and a diameter D = 1 [m] in which a slurry 1 that is a solid-liquid two-phase fluid of a liquid phase and powdery particles is stored. When rotating at a rotational speed ω = 20 [rpm], the maximum speed and the average speed in the vertical upward flow of the slurry 1 in the entire tank 2 were calculated and compared quantitatively. [Table 1] summarizes the maximum speed | w + | max and the average speed | w + | ave of the vertical rising speed | w + | (only the positive value of the speed component w) in the entire tank 2 obtained by the analysis. .

Figure 2005270758
Figure 2005270758

［表１］から、スラリー１の鉛直方向上昇流における最大速度｜ｗ+｜max並びに平均速度｜ｗ+｜aveがともに図１〜図３に示す改良型（本発明）では図４〜図６に示す従来型より向上しており、平均速度｜ｗ+｜aveで比較すると、従来型と比べ約１割程度の性能向上が確認された。 From [Table 1], the maximum velocity | w + | max and the average velocity | w + | ave in the vertically rising flow of the slurry 1 are both shown in FIGS. 4 to 6 in the improved type (the present invention) shown in FIGS. Compared with the average speed | w + | ave, it was confirmed that the performance was improved by about 10% compared to the conventional type.

鉛直方向上昇速度｜ｗ+｜の最大速度｜ｗ+｜maxは、煙突状流路部１０内で発生しており、従来型と比較すると改良型（本発明）の方が約１．５倍に向上している。このことから、タンク２内部に挿入配置された撹拌手段３としてのＬ型撹拌部材６を中空にすることで、タンク２内底部に沈殿したスラリー１が下段流路部８と上段流路部９を経て煙突状流路部１０内を上方へ流れ、効果的に上下方向への循環が行われていると推測できる。 The vertical speed | w + | maximum speed | w + | max is generated in the chimney-shaped channel section 10 and is about 1.5 times that of the improved type (the present invention) compared to the conventional type. Has improved. From this, by making the L-shaped stirring member 6 as the stirring means 3 inserted and arranged in the tank 2 hollow, the slurry 1 precipitated on the bottom of the tank 2 is allowed to flow down to the lower flow path portion 8 and the upper flow path portion 9. It can be presumed that the gas flows upward through the chimney-shaped flow path portion 10 and is effectively circulated in the vertical direction.

従来型の場合、タンク２内底部において、タンク２の回転に伴って発生するスラリー１のタンク２周方向流は、Ｌ型撹拌部材６’の水平撹拌翼部５’に衝突し、ほとんどがタンク２の半径方向へ偏向されて水平循環流となり、タンク内壁２ａ付近に発生した速い流れが効果的に活用できておらず、上昇流への変換効率が悪くなっているが、改良型（本発明）の場合、タンク２の回転に伴って発生するスラリーのタンク２周方向流の上流側に対応する水平撹拌翼部５の側面近傍に小さな循環流が発生しているものの、タンク内壁２ａ付近に発生した速い流れを効率良く水平撹拌翼部５の入口開口部７に掻き集めることができているのが確認された。   In the case of the conventional type, the flow in the circumferential direction of the tank 2 of the slurry 1 generated along with the rotation of the tank 2 collides with the horizontal stirring blade portion 5 ′ of the L-type stirring member 6 ′ at the inner bottom portion of the tank 2. 2 is deflected in the radial direction to become a horizontal circulation flow, and the fast flow generated in the vicinity of the tank inner wall 2a cannot be effectively used, and the conversion efficiency to the upward flow is deteriorated. ), A small circulating flow is generated in the vicinity of the side surface of the horizontal stirring blade portion 5 corresponding to the upstream side of the circumferential flow of the slurry in the circumferential direction of the tank 2 generated by the rotation of the tank 2, but in the vicinity of the tank inner wall 2a. It was confirmed that the generated fast flow could be efficiently scraped to the inlet opening 7 of the horizontal stirring blade part 5.

又、改良型（本発明）では、タンク２内底部に沈殿したスラリー１が煙突状流路部１０内を上方へ流れるため、沈降性を有するスラリー１を上下方向へ撹拌させる観点からは効果的な撹拌が行われていると推測できる。そのため、鉛直方向上昇速度｜ｗ+｜の平均速度｜ｗ+｜aveだけでは評価できない撹拌性能の向上があると考えられる。 Further, in the improved type (the present invention), the slurry 1 that has settled at the bottom of the tank 2 flows upward in the chimney-shaped flow path portion 10, which is effective from the viewpoint of stirring the slurry 1 having sedimentation in the vertical direction. It can be inferred that proper agitation is performed. Therefore, it is considered that there is an improvement in stirring performance that cannot be evaluated only by the average speed | w + | ave of the vertical direction rising speed | w + |.

一方、液相と粉末状粒子の固液二相流体であるスラリー１が貯留された高さｈ＝１［ｍ］、直径Ｄ＝１［ｍ］のタンク２を回転速度ω＝２０［ｒｐｍ］で回転させた場合に、従来型におけるタンク２の極底部（水平撹拌翼部５’とタンク内底面２ｂとの隙間）での撹拌性能と、改良型（本発明）におけるタンク２の極底部（水平撹拌翼部５とタンク内底面２ｂとの隙間）での撹拌性能との比較をするため、タンク内底面２ｂから高さｈ＝０．０１・Ｄまでの領域に限定してスラリー１の鉛直方向上昇流の平均速度を算出し、定量的に比較を行った。解析で得られたタンク２の極底部における鉛直方向上昇速度｜ｗ+｜（速度成分ｗの正の値のみ）の平均速度｜ｗ+｜aveを［表２］にまとめる。 On the other hand, a tank 2 having a height h = 1 [m] and a diameter D = 1 [m] in which slurry 1 which is a solid-liquid two-phase fluid of liquid phase and powdery particles is stored is rotated at a rotational speed ω = 20 [rpm]. , The stirring performance at the very bottom of the tank 2 in the conventional type (the gap between the horizontal stirring blade 5 'and the bottom surface 2b in the tank), and the bottom of the tank 2 in the improved type (the present invention) ( In order to compare the stirring performance at the gap between the horizontal stirring blade 5 and the tank bottom surface 2b), the vertical direction of the slurry 1 is limited to the region from the tank bottom surface 2b to the height h = 0.01 · D. The average velocity of directional upward flow was calculated and compared quantitatively. The average speed | w + | ave of the vertical direction rising speed | w + | (only the positive value of the speed component w) at the extreme bottom of the tank 2 obtained by the analysis is summarized in [Table 2].

Figure 2005270758
Figure 2005270758

［表２］から、改良型（本発明）では、従来型に比べ約２倍の平均速度｜ｗ+｜aveが発生しており、撹拌性能が向上しているのが確認された。 From [Table 2], in the improved type (the present invention), an average speed | w + | ave of about twice that in the conventional type was generated, and it was confirmed that the stirring performance was improved.

従来型では、タンク２の極底部（水平撹拌翼部５’とタンク内底面２ｂとの隙間）において上下方向流がほとんど発生していないが、改良型（本発明）では、タンク２内底部のスラリー１をＬ型撹拌部材６内部に掻き集める際に、下段流路部８に一旦取り込まれたスラリー１の一部が水平撹拌翼部５とタンク内底面２ｂとの隙間から流出しようとするために、その流出箇所で大きな下降流が発生し、ここで発生した下降流はタンク内底面２ｂに衝突して上昇流となり、タンク２の極底部（水平撹拌翼部５とタンク内底面２ｂとの隙間）を循環すると考えられる。   In the conventional type, there is almost no vertical flow at the very bottom of the tank 2 (the gap between the horizontal stirring blade portion 5 ′ and the bottom surface 2b of the tank), but in the improved type (the present invention), When the slurry 1 is scraped up inside the L-shaped stirring member 6, a part of the slurry 1 once taken into the lower flow path portion 8 tends to flow out from the gap between the horizontal stirring blade portion 5 and the tank bottom surface 2b. In addition, a large downward flow is generated at the outflow point, and the downward flow generated here collides with the tank inner bottom surface 2b and becomes an upward flow, and the extreme bottom portion of the tank 2 (the horizontal stirring blade portion 5 and the tank inner bottom surface 2b It is thought that the gap) circulates.

以上から、これまで問題となっていたタンク２内底部でのスラリー１の沈殿に関しても、改良型（本発明）のＬ型撹拌部材６の導入により解消されると期待できる。   From the above, it can be expected that the precipitation of the slurry 1 at the inner bottom of the tank 2 which has been a problem until now can be solved by the introduction of the improved (invention) L-shaped stirring member 6.

尚、本発明のスラリー撹拌装置は、上述の図示例にのみ限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。   In addition, the slurry stirring apparatus of this invention is not limited only to the above-mentioned illustration example, Of course, various changes can be added within the range which does not deviate from the summary of this invention.

本発明を実施する形態の一例の斜視図である。It is a perspective view of an example of an embodiment which carries out the present invention. 本発明を実施する形態の一例の側断面図である。It is side sectional drawing of an example of the form which implements this invention. 本発明を実施する形態の一例の平面図である。It is a top view of an example of an embodiment which carries out the present invention. 従来例の斜視図である。It is a perspective view of a prior art example. 従来例の側断面図である。It is a sectional side view of a prior art example. 従来例の平面図である。It is a top view of a prior art example.

符号の説明Explanation of symbols

１ スラリー
２ タンク
２ａ タンク内壁
２ｂ タンク内底面
３ 撹拌手段
４ 垂直撹拌翼部
５ 水平撹拌翼部
６ Ｌ型撹拌部材
７ 入口開口部
８ 下段流路部
９ 上段流路部
１０ 煙突状流路部
１１ 出口開口部 DESCRIPTION OF SYMBOLS 1 Slurry 2 Tank 2a Tank inner wall 2b Tank inner bottom face 3 Stirring means 4 Vertical stirring blade part 5 Horizontal stirring blade part 6 L type stirring member 7 Inlet opening part 8 Lower stage flow path part 9 Upper stage flow path part 10 Chimney-like flow path part 11 Outlet opening

Claims (5)

スラリーが貯留されたタンクを上下方向ヘ延びる軸を中心として回転させるスラリー撹拌装置において、
タンク内部に、該タンクの回転に伴って発生するスラリーのタンク周方向流から上下方向循環流を生じさせるための撹拌手段を挿入配置したことを特徴とするスラリー撹拌装置。 In a slurry agitating device that rotates a tank storing slurry around an axis extending in the vertical direction,
A slurry agitation apparatus, wherein an agitation means for generating a vertical circulation flow from a circumferential flow of a slurry generated as the tank rotates is inserted and disposed in the tank. 撹拌手段を、タンク上方からタンク内壁に沿い所要隙間をあけて垂下するよう吊り下げられ且つタンク内壁への対向面が開放された中空の垂直撹拌翼部と、該垂直撹拌翼部の下端からタンク内底面に沿い所要隙間をあけて半径方向へ延びるよう配設され且つタンク内底面への対向面が開放された中空の水平撹拌翼部とからなるＬ型撹拌部材で構成した請求項１記載のスラリー撹拌装置。   The stirring means is suspended from above the tank along the inner wall of the tank so as to hang down with a required gap, and has a hollow vertical stirring blade that opens to the tank inner wall, and a tank from the lower end of the vertical stirring blade. 2. The L-type stirring member according to claim 1, wherein the L-type stirring member comprises a hollow horizontal stirring blade portion that is disposed so as to extend in the radial direction along the inner bottom surface with a required gap therebetween and that is open to a surface facing the inner bottom surface of the tank. Slurry stirring device. Ｌ型撹拌部材が、
タンク内底部におけるタンク内壁付近に沈降したスラリーを取り込むよう水平撹拌翼部の端部に形成された入口開口部と、
該入口開口部から取り込まれたスラリーをタンク内底部中心側へ導くよう水平撹拌翼部の内部下側に形成された下段流路部と、
該下段流路部によりタンク内底部中心側へ導かれたスラリーを折り返してタンク内壁側へ導くよう水平撹拌翼部の内部上側に形成された上段流路部と、
該上段流路部によりタンク内壁側へ導かれたスラリーを上方へ導くよう垂直撹拌翼部の内部に形成された煙突状流路部と、
該煙突状流路部により上方へ導かれたスラリーを放出するよう垂直撹拌翼部の上端部に形成された出口開口部と
を備えてなる請求項２記載のスラリー撹拌装置。 L-shaped stirring member
An inlet opening formed at the end of the horizontal agitating blade to take in the slurry that has settled near the inner wall of the tank at the bottom of the tank;
A lower flow path portion formed on the inner lower side of the horizontal agitating blade portion so as to guide the slurry taken in from the inlet opening portion to the center side of the inner bottom portion of the tank;
An upper flow path portion formed on the inner upper side of the horizontal agitating blade section so as to fold back the slurry guided to the center side in the tank bottom by the lower flow path section and guide it to the tank inner wall side;
A chimney-like channel part formed inside the vertical stirring blade part to guide the slurry guided to the tank inner wall side by the upper channel part upward,
The slurry stirring apparatus according to claim 2, further comprising: an outlet opening formed at an upper end portion of the vertical stirring blade portion so as to discharge the slurry guided upward by the chimney channel portion. タンクの回転に伴って発生するスラリーのタンク周方向流の上流側に対応する水平撹拌翼部の側面に入口開口部を形成すると共に、タンクの回転に伴って発生するスラリーのタンク周方向流の下流側に対応する垂直撹拌翼部の側面に出口開口部を形成した請求項３記載のスラリー撹拌装置。   An inlet opening is formed on the side surface of the horizontal agitating blade corresponding to the upstream side of the tank circumferential flow of the slurry generated with the rotation of the tank, and the tank circumferential flow of the slurry generated with the rotation of the tank. The slurry stirring apparatus of Claim 3 which formed the exit opening part in the side surface of the vertical stirring blade part corresponding to a downstream. 精密鋳造用鋳型の原型となるモデル型を成形するためのスラリーをタンク内に貯留するようにした請求項１〜４いずれかに記載のスラリー撹拌装置。   The slurry agitation apparatus according to any one of claims 1 to 4, wherein a slurry for forming a model mold as a prototype of a precision casting mold is stored in a tank.
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CN109046136A (en) * 2018-07-09 2018-12-21 中国核电工程有限公司 Rabbling mechanism in a kind of Novel bucket
CN109046136B (en) * 2018-07-09 2022-06-07 中国核电工程有限公司 Stirring mechanism in barrel

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