JP2007090265A - Stirring apparatus - Google Patents

Stirring apparatus Download PDF

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JP2007090265A
JP2007090265A JP2005284661A JP2005284661A JP2007090265A JP 2007090265 A JP2007090265 A JP 2007090265A JP 2005284661 A JP2005284661 A JP 2005284661A JP 2005284661 A JP2005284661 A JP 2005284661A JP 2007090265 A JP2007090265 A JP 2007090265A
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stirring
stirring blade
blade
tank
upper stirring
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JP4701056B2 (en
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Shoji Morinaga
昌二 森永
Ryuichi Yatomi
隆一 弥富
Katsuhide Takenaka
克英 竹中
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SHI MECHANICAL and equipment Inc
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SHI MECHANICAL and equipment Inc
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Priority to PCT/JP2006/319155 priority patent/WO2007037263A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/07—Stirrers characterised by their mounting on the shaft
    • B01F27/072—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis
    • B01F27/0723—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis oblique with respect to the rotating axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/07—Stirrers characterised by their mounting on the shaft
    • B01F27/072—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis
    • B01F27/0724—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis directly mounted on the rotating axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1125—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades with vanes or blades extending parallel or oblique to the stirrer axis
    • B01F27/11253—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades with vanes or blades extending parallel or oblique to the stirrer axis the blades extending oblique to the stirrer axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/19—Stirrers with two or more mixing elements mounted in sequence on the same axis
    • B01F27/192—Stirrers with two or more mixing elements mounted in sequence on the same axis with dissimilar elements

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stirring apparatus which can rapidly and uniformly stir and mix fluid of a wide viscosity region from high viscosity to low viscosity in a whole tank. <P>SOLUTION: The stirring apparatus is equipped with an upper stirring blade section and a lower stirring blade of a planar shape disposed at a stirring shaft. The upper stirring blade section is equipped with a plurality of steps of a pair of upper stirring blades which are constituted by providing the plurality of upper stirring blades along a peripheral direction of the stirring shaft at predetermined spacings and with inclination of an predetermined upward angle toward a rotational direction of the stirring shaft. Corresponding upper stirring blades of respective steps are respectively disposed at positions where the upper stirring blade of an upper step is superposed on the upper stirring blade of a lower step in a longitudinal direction so that a lower side of the upper stirring blade at a lower stage can be seen from a lower side of the upper stirring blade at an upper stage and further an angle from an upper side of the upper stirring blade at an uppermost step till a lower side of the upper stirring blade at a lowest stage to a rotational direction around the stirring shaft is smaller than 180°. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、混合、溶解、晶析、反応等を目的とした攪拌処理用の攪拌装置に関する。   The present invention relates to a stirring device for stirring treatment for the purpose of mixing, dissolution, crystallization, reaction and the like.

従来、攪拌装置の攪拌翼として、タービン翼、パドル翼、プロペラ翼等の小型翼を多段で使用する例が多い。これらの攪拌翼を使用する攪拌装置では、翼回転数を高くして翼から半径方向に吐出される液の流量を多くすることにより、液が攪拌槽内壁面（以下、単に「槽壁」と言うことがある。）に衝突して上方及び下方に回り、再び翼の所へ戻る循環流動を発生させ、槽内の混合を行っていた。   Conventionally, there are many examples in which small blades such as turbine blades, paddle blades, propeller blades, and the like are used in multiple stages as stirring blades of a stirring device. In a stirring device using these stirring blades, the liquid is stirred by increasing the blade rotation speed and increasing the flow rate of the liquid discharged from the blades in the radial direction. The circulatory flow that returns to the wings again is generated by mixing with the inside of the tank.

しかし、上記小型翼では、図１１に示すように、攪拌槽（以下、単に「槽」と言うことがある。）内の全体に亘って十分な上下循環流動が形成されず、上下間に複数の仕切ゾーンＺ，…ができてしまうため、槽の上下方向の液の混合が進み難く、攪拌特性はあまり良くない。   However, in the small blade, as shown in FIG. 11, sufficient vertical circulation flow is not formed over the entire inside of the agitation tank (hereinafter, sometimes simply referred to as “tank”), and a plurality of vertical wings are not provided between the upper and lower sides. , So that mixing of liquids in the vertical direction of the tank is difficult to proceed, and the stirring characteristics are not so good.

これに対し、図１２に示すように、攪拌軸に沿って取り付けられる大型の平板型翼では、槽内の全体に亘って翼から半径方向への液の吐出量が大きいため、攪拌特性が良いというメリットがあり、比較的高粘度の液や槽底部に沈降し易い個体を含む液体の攪拌処理に適している。   On the other hand, as shown in FIG. 12, the large flat plate blade attached along the stirring shaft has a good stirring characteristic because the amount of liquid discharged from the blade in the radial direction is large throughout the tank. It is suitable for agitation treatment of liquids containing relatively high viscosity liquids and liquids that easily settle on the bottom of the tank.

しかし、このような平板型翼であっても、翼の上半分と下半分とで翼から半径方向へ吐出される液の吐出量が等しいため、翼の上半分から下方への吐出流動と翼の下半分から上方への吐出流動とが衝突して、やはり上下間に仕切ゾーンができてしまい、前記同様、槽内の全体に亘って十分な上下の循環流動が形成されず、槽の上下方向の液の混合が進み難く、攪拌特性が十分ではない。   However, even with such a flat blade, the upper half and the lower half of the blade have the same amount of liquid discharged from the blade in the radial direction. The upper part of the tank collides with the discharge flow from the lower half to the upper part, and a partition zone is formed between the upper and lower sides. The mixing of liquid in the direction is difficult to proceed, and the stirring characteristics are not sufficient.

また、前記大型の平板翼では、Ｒｅ数が５０以上であれば攪拌特性は良いが、Ｒｅ数が５０以下の高粘度になると液の慣性力が弱くなり、このような大型の平板翼でも径方向の吐出量が非常に小さくなる。そのため、十分な循環流動が形成されず、上下方向での良好な混合が得られない。   In addition, the large flat blades have good stirring characteristics if the Re number is 50 or more, but if the Re number becomes high viscosity of 50 or less, the inertia force of the liquid becomes weak. The discharge amount in the direction becomes very small. Therefore, sufficient circulation flow is not formed, and good mixing in the vertical direction cannot be obtained.

一方、高粘度用のリボン翼やアンカー翼などでは、低粘度になると径方向への吐出量が極めて少なく、低粘度では十分な循環流動が形成されず、上下方向での良好な混合が得られない。   On the other hand, with high-viscosity ribbon blades and anchor blades, the discharge rate in the radial direction is extremely small when the viscosity is low, and sufficient circulation flow is not formed at low viscosity, and good mixing in the vertical direction is obtained. Absent.

そこで、図１３乃至図１５に示すように、攪拌軸２１の回転方向に対して上向き角度に傾斜させて設けた上部攪拌翼２２と垂直方向に（軸方向に沿って）設けた下部攪拌翼２３とを備える攪拌装置２０が提供されている（特許文献１参照）。   Therefore, as shown in FIGS. 13 to 15, the lower stirring blade 23 provided in the vertical direction (along the axial direction) and the upper stirring blade 22 provided to be inclined at an upward angle with respect to the rotation direction of the stirring shaft 21. Is provided (see Patent Document 1).

この攪拌装置の上部攪拌翼は、四半楕円形状に形成された第１の上部攪拌翼２２ａと第２の上部攪拌翼２２ｂとを平行且つ第１の上部攪拌翼２２ａ下部と第２の上部攪拌翼２２ｂ上部とが重なるように配置して半楕円形の傾斜段差翼２２を構成し、かかる半楕円形の傾斜段差翼（第１の上部翼２２ａ及び第２の上部翼２２ｂ）２２を攪拌軸２１の回転方向に対して上向きに傾斜させ、且つ両側から挟むように固定することで構成されている。   The upper stirring blade of the stirring device has a first upper stirring blade 22a and a second upper stirring blade 22b formed in a quarter-elliptical shape in parallel, and a lower portion of the first upper stirring blade 22a and a second upper stirring blade. The semi-elliptical inclined step blades 22 are arranged so as to overlap with the upper portion of 22b, and the semi-elliptical inclined step blades (first upper blade 22a and second upper blade 22b) 22 are mixed with the stirring shaft 21. It is comprised by making it incline upward with respect to the rotation direction of this, and fixing so that it may pinch | interpose from both sides.

一方、下部攪拌翼２３は、外周端が槽壁近傍まで延設された平板状で、その先端部（外周端部）が攪拌軸２１の回転方向に対して後退側（攪拌軸の回転方向と反対側）に屈曲している。   On the other hand, the lower stirring blade 23 is a flat plate having an outer peripheral end extending to the vicinity of the tank wall, and a tip end portion (outer peripheral end portion) of the lower stirring blade 23 moves backward (with respect to the rotation direction of the stirring shaft). Bent to the opposite side.

このような構成の攪拌翼では、攪拌軸２１が回転することによって、該攪拌軸２１上部に設けた傾斜段差翼２２も共に回転する。その際、傾斜段差翼２２の上部（先端）に位置する槽上部の液が傾斜段差翼２２に沿って下方（底方向）に移動させられることにより、槽内上部の液が槽内下部（下部攪拌翼２３側）へ移動され、移動された液が下部攪拌翼２３により槽の径方向に吐出され、槽壁に衝突することで上昇して槽内で上下循環流動を形成し、高粘度から低粘度までの広い粘度域の流体（液）の槽内における上下循環流動が形成されることによって、上下方向での攪拌混合が行われる。   In the stirring blade having such a configuration, when the stirring shaft 21 rotates, the inclined step blade 22 provided on the stirring shaft 21 also rotates. At that time, the liquid in the upper part of the tank located at the upper part (tip) of the inclined step wing 22 is moved downward (bottom direction) along the inclined step wing 22 so that the liquid in the upper part in the tank becomes lower in the tank (lower part). To the stirring blade 23 side), and the moved liquid is discharged in the radial direction of the tank by the lower stirring blade 23 and rises by colliding with the tank wall to form a vertical circulation flow in the tank. The vertical mixing flow in the tank of the fluid (liquid) in a wide viscosity range up to a low viscosity is formed, whereby the stirring and mixing in the vertical direction is performed.

特開平９−７５６９９号公報Japanese Patent Laid-Open No. 9-75699

ところで、近年、攪拌作業の効率化が求められており、そのため、攪拌時間を短縮できるよう、短時間で十分に攪拌混合できる攪拌特性の良い攪拌装置が要求されている。   Incidentally, in recent years, there has been a demand for efficient stirring work, and therefore, a stirring device with good stirring characteristics that can be sufficiently stirred and mixed in a short time is required so as to shorten the stirring time.

しかし、前記従来の傾斜段差翼２２を備えた攪拌装置２０では、上部攪拌翼（傾斜段差翼）２２によって槽上部の液が下部攪拌翼２３側へ移動されるためには、攪拌軸を１８０°回転、即ち、半回転させなければならず、槽内における上下方向での良好な混合を得るためには多くの回転数（回転角）が必要となる。そのため前記攪拌時間の短縮という要求に対し十分に応えることができなかった。   However, in the stirring device 20 provided with the conventional inclined step blade 22, in order for the liquid in the upper part of the tank to be moved to the lower stirring blade 23 side by the upper stirring blade (inclined step blade) 22, the stirring shaft is 180 °. Rotation, that is, half rotation is required, and a large number of rotations (rotation angles) are required to obtain good mixing in the vertical direction in the tank. Therefore, the request for shortening the stirring time could not be sufficiently met.

そこで、本発明は、上記問題に鑑み、高粘度から低粘度までの広い粘度域の流体を、槽内の全体に亘って速やか且つ均一に攪拌混合することができる攪拌装置を提供することを課題とする。   Therefore, in view of the above problems, the present invention provides a stirrer that can rapidly and uniformly stir and mix a fluid in a wide viscosity range from high viscosity to low viscosity over the entire tank. And

上記課題を解決すべく、本発明に係る攪拌装置は、攪拌槽内中心部に槽外から回転可能な攪拌軸が配設され、該攪拌軸に配設される上部攪拌翼部と該上部攪拌翼部下端近傍から槽底面近傍まで垂下し且つ攪拌軸から径方向に延設される平板状の下部攪拌翼とを備える攪拌装置であって、前記上部攪拌翼部は、複数の上部攪拌翼が前記攪拌軸の周方向に沿って所定間隔に且つ前記攪拌軸の回転方向に対して所定の上向き角度で傾斜して設けられることで構成される一組の上部攪拌翼を複数段備え、前記各段の対応する上部攪拌翼は、上段の上部攪拌翼と下段の上部攪拌翼とが、軸長方向において、前記上段の上部攪拌翼の下辺側から前記下段の上部攪拌翼の下辺側が見えるように重なる位置にそれぞれ配設されると共に、最上段の上部攪拌翼の上辺から最下段の上部攪拌翼の下辺までの攪拌軸を中心とする回転方向に対する角度が１８０°より小さくなるように配設されることを特徴とする。   In order to solve the above-described problems, the stirring device according to the present invention includes a stirring shaft that is rotatable from outside the tank at the center of the stirring tank, and an upper stirring blade portion that is disposed on the stirring shaft and the upper stirring blade. A stirring device comprising a flat lower stirring blade that hangs from the vicinity of the lower end of the blade portion to the vicinity of the bottom of the tank and extends in the radial direction from the stirring shaft, wherein the upper stirring blade portion includes a plurality of upper stirring blades. A plurality of sets of upper stirring blades configured by being provided at predetermined intervals along the circumferential direction of the stirring shaft and inclined at a predetermined upward angle with respect to the rotation direction of the stirring shaft, The upper stirring blade corresponding to the stage is such that the upper stirring blade of the upper stage and the lower stirring blade of the lower stage are visible in the axial direction from the lower side of the upper stirring blade of the upper stage to the lower side of the upper stirring blade of the lower stage. It is arranged at the overlapping position, and the top stirring blade of the uppermost stage Angle, characterized in that it is arranged to be less than 180 ° with respect to the rotational direction around the stirring shaft from the side to the lower side of the lowermost top stirring blade.

上記構成とすることで、前記攪拌軸を回転させると、前記上部攪拌翼部によって槽上部の液が前記下部攪拌翼側（槽下部）へ移動される。その際に必要な前記攪拌軸の回転角度は、１８０°より小さい角度で良い。即ち、１８０°より小さい回転角で槽上部の液を下部（底部）にまで一気に到達させることができるようになる。   With the above configuration, when the stirring shaft is rotated, the liquid in the upper part of the tank is moved to the lower stirring blade side (lower part of the tank) by the upper stirring blade part. The rotation angle of the stirring shaft required at that time may be an angle smaller than 180 °. That is, the liquid in the upper part of the tank can be made to reach the lower part (bottom part) at a stretch with a rotation angle smaller than 180 °.

さらに、上記構成とすることで、前記攪拌軸を回転させると、前記上部攪拌翼によって槽上部の液を効率よく前記下部攪拌翼側へ移動できるようにもなる。   Further, with the above configuration, when the stirring shaft is rotated, the liquid in the upper part of the tank can be efficiently moved to the lower stirring blade side by the upper stirring blade.

これは、傾斜翼を液中で回転させると、翼の表面（回転方向の面）側に正圧が発生し、裏面（回転方向と逆の面）側には負圧が発生する。そのため、上段の上部攪拌翼の裏面に発生する負圧によって該上部攪拌翼の裏面側近傍の液が引き込まれ、この引き込まれた液が下段の上部攪拌翼の裏面に発生する負圧によって下方に移動され、さらに下段の上部攪拌翼の裏面に発生する負圧によってさらに下方に移動されるからである。即ち、上部攪拌翼の裏面に発生する負圧部に引き込まれた液が、その下段の上部攪拌翼の裏面に発生する負圧部に引き込まれることで下方に移動することにより、槽上部の液は下方側に移動される。   When the inclined blade is rotated in the liquid, a positive pressure is generated on the surface (surface in the rotation direction) of the blade, and a negative pressure is generated on the back surface (surface opposite to the rotation direction). Therefore, the liquid in the vicinity of the back surface of the upper stirring blade is drawn by the negative pressure generated on the back surface of the upper stirring blade in the upper stage, and the drawn liquid is lowered by the negative pressure generated on the back surface of the upper stirring blade in the lower stage. This is because it is moved and further moved downward by the negative pressure generated on the back surface of the lower upper stirring blade. That is, the liquid drawn into the negative pressure portion generated on the back surface of the upper stirring blade moves downward by being drawn into the negative pressure portion generated on the back surface of the lower upper stirring blade, thereby Is moved downward.

また、上段の上部攪拌翼の表面に発生する正圧と下段の上部攪拌翼の裏面に発生する負圧とによって、上段の上部攪拌翼の下辺部と下段の上部攪拌翼の上辺部との重複部分に吸引力が発生し、上段の上部攪拌翼によって下方に移動された液が重複部分に引き込まれ、この引き込まれた液は、下段の上部攪拌翼の裏面に発生している負圧によって、該下段の上部攪拌翼に沿ってさらに下方に移動される。   Also, overlap between the lower side of the upper upper stirring blade and the upper side of the lower upper stirring blade due to the positive pressure generated on the surface of the upper upper stirring blade and the negative pressure generated on the back surface of the lower upper stirring blade. A suction force is generated in the part, and the liquid moved downward by the upper stirring blade on the upper stage is drawn into the overlapping part, and the drawn liquid is caused by the negative pressure generated on the back surface of the upper stirring blade in the lower stage. It moves further downward along the lower upper stirring blade.

この時、下段の上部攪拌翼の表面の正圧によって下方に移動された液も、前記同様に、さらに下段の上部攪拌翼との重複部分に引き込まれて下方に移動され、このような理由によっても、槽上部の液は下方側に移動される。   At this time, the liquid moved downward by the positive pressure on the surface of the lower upper agitating blade is also drawn downward into the overlapping portion with the lower upper agitating blade and moved downward as described above. However, the liquid in the upper part of the tank is moved downward.

以上のようにして、上部攪拌翼に沿って下方側に効率よく液が移動できるようになる。そのため、上部攪拌翼部によって槽上部の液が下部攪拌翼側へ効率よく移動できるようになる。この下部攪拌翼側に移動された液は、さらに下部攪拌翼によって槽壁（径）方向に吐出される。そして、この吐出された液が槽壁に衝突して上昇することによって、槽内に上下循環流動が形成される。   As described above, the liquid can be efficiently moved downward along the upper stirring blade. Therefore, the liquid at the upper part of the tank can be efficiently moved toward the lower stirring blade by the upper stirring blade. The liquid moved to the lower stirring blade side is further discharged in the tank wall (diameter) direction by the lower stirring blade. Then, the discharged liquid collides with the tank wall and rises to form a vertical circulation flow in the tank.

従って、従来の攪拌翼よりも少ない回転数で、槽内に十分な流量の上下循環流動が形成され、上下方向での良好な混合が行われる。   Therefore, a vertical circulation flow with a sufficient flow rate is formed in the tank with a smaller number of revolutions than that of a conventional stirring blade, and good mixing in the vertical direction is performed.

また、攪拌槽内中心部に槽外から回転可能な攪拌軸が配設され、該攪拌軸に配設される上部攪拌翼部と該上部攪拌翼部下端近傍から槽底面近傍まで垂下し且つ攪拌軸から径方向に延設される平板状の下部攪拌翼とを備える攪拌装置であって、前記上部攪拌翼部は、複数の上部攪拌翼が前記攪拌軸の周方向に沿って所定間隔に且つ前記攪拌軸の回転方向に対して所定の上向き角度で傾斜して設けられることで構成される一組の上部攪拌翼を複数段備え、前記各段の対応する上部攪拌翼は、上段の上部攪拌翼と下段の上部攪拌翼とが、軸長方向において、前記上段の上部攪拌翼の下辺側から前記下段の上部攪拌翼の下辺側が見えるように重なる位置にそれぞれ配設されると共に、軸長方向において、攪拌槽底面を、攪拌軸を中心とする回転方向に対して所定の角度だけ覆うように配設されることを特徴とする攪拌装置であっても良い。   In addition, a stirring shaft that can rotate from the outside of the tank is disposed at the center of the stirring tank. The stirring shaft is suspended from the bottom of the upper stirring blade and the bottom of the upper stirring blade to the bottom of the tank and is stirred. A stirring device having a flat lower stirring blade extending in a radial direction from a shaft, wherein the upper stirring blade portion includes a plurality of upper stirring blades at predetermined intervals along a circumferential direction of the stirring shaft; The upper stirrer blades corresponding to each stage are provided with a plurality of stages of upper stirrer blades that are configured to be inclined at a predetermined upward angle with respect to the rotation direction of the stirrer shaft. The blade and the lower upper agitating blade are respectively arranged at positions overlapping in the axial direction so that the lower side of the upper upper agitating blade can be seen from the lower side of the upper upper agitating blade, and in the axial direction The bottom of the stirring tank in the direction of rotation about the stirring axis It is disposed to cover a predetermined angle and may be a stirring apparatus according to claim.

上記構成とすることでも、前記同様、攪拌軸は、１８０°よりも小さな回転角で槽上部の液を下部にまで到達させることができ、また、上部攪拌翼部は、槽上部の液を効率よく下部攪拌翼側へ移動できるようになる。   Even with the above configuration, as described above, the stirring shaft can cause the liquid in the upper part of the tank to reach the lower part at a rotation angle smaller than 180 °, and the upper stirring blade part can efficiently make the liquid in the upper part of the tank efficient. It becomes possible to move to the lower stirring blade side well.

従って、従来の攪拌翼よりも少ない回転数で、槽内により十分な流量の上下循環流動が形成され、上下方向での良好な混合が行われる。その結果、槽内の全体に亘って速やか且つ均一に攪拌混合することができるようになる。   Therefore, a vertical circulation flow with a sufficient flow rate is formed in the tank with a smaller number of revolutions than that of a conventional stirring blade, and good mixing in the vertical direction is performed. As a result, stirring and mixing can be performed quickly and uniformly throughout the entire tank.

また、前記上部攪拌翼は、攪拌槽内壁面に向かって回転方向に幅広となる扇形形状に形成される構成とすることが好ましい。   Moreover, it is preferable that the said upper stirring blade is set as the structure formed in the sector shape which becomes wide in a rotation direction toward the inner wall surface of a stirring tank.

上記構成とすることで、上部攪拌翼の面積を広くすることができ、槽下部方向へ移動される液の流量をより多くすることができるようになる。   By setting it as the said structure, the area of an upper stirring blade can be enlarged and the flow volume of the liquid moved to a tank lower part direction can be increased more now.

さらに、扇形形状とすることで、上段の上部攪拌翼と対応する下段の上部攪拌翼との重複部分の面積が大きくなり、より重複部分の吸引力が強くなる。その結果、下方へ移動される液の流量がより多くなる。   Furthermore, by making it fan-shaped, the area of the overlapping part between the upper stirring blade on the upper stage and the corresponding upper stirring blade on the lower stage becomes larger, and the suction force of the overlapping part becomes stronger. As a result, the flow rate of the liquid moved downward is increased.

従って、上部攪拌翼部による槽下部へ移動される液の流量も増え、槽内の下降流（槽下部側への各段の上部攪拌翼に沿った液の流れ）の流量がより増加する。それに伴って槽内の上下循環流動の流量が増加し、槽内における上下方向での良好な混合をより速やかにできるようになる。その結果、槽内の上下方向全体に亘って、より速やか且つ均一に攪拌混合することができるようになる。   Therefore, the flow rate of the liquid moved to the lower part of the tank by the upper stirring blade part also increases, and the flow rate of the downward flow (liquid flow along the upper stirring blades of each stage toward the lower part of the tank) further increases. Along with this, the flow rate of the vertical circulation flow in the tank increases, and good mixing in the vertical direction in the tank can be performed more quickly. As a result, stirring and mixing can be performed more quickly and uniformly over the entire vertical direction in the tank.

また、前記上部攪拌翼は、その攪拌槽内壁面側の外周端が前記内壁面に近接した形状である構成とすることが好ましい。   Moreover, it is preferable that the said upper stirring blade is set as the structure which the outer peripheral end by the side of the inner wall surface of the stirring tank is a shape which adjoined the said inner wall surface.

上記構成とすることで、上部攪拌翼の面積をより広くすることができる。従って、前記同様、より上部攪拌翼部による下降流の流量が増え、上下循環流動の流量を多くすることができ、槽内の上下方向での良好な混合を得ることができる。   By setting it as the said structure, the area of an upper stirring blade can be enlarged more. Therefore, as described above, the flow rate of the downward flow by the upper stirring blade portion is increased, the flow rate of the vertical circulation flow can be increased, and good mixing in the vertical direction in the tank can be obtained.

また、前記下部攪拌翼は、攪拌槽底面に向かって径方向に幅広となる構成とすることが好ましい。   Moreover, it is preferable that the said lower stirring blade becomes a structure widened to radial direction toward the bottom face of a stirring tank.

上記構成とすることで、下部攪拌翼上部と下部攪拌翼下部との径方向への液の吐出量の差が生じ、この吐出された液が槽壁に衝突した際、槽壁の上方側の吐出量ほど少ないため、より上昇流が起こり易くなる。このことによって、より上下方循環流動が形成され易くなり、槽内の全体に亘って速やか且つ均一に攪拌混合することができるようになる。   With the above configuration, there is a difference in the amount of liquid discharged in the radial direction between the upper part of the lower stirring blade and the lower part of the lower stirring blade, and when this discharged liquid collides with the tank wall, Since the discharge amount is smaller, the upward flow is more likely to occur. As a result, an upward and downward circulating flow is more easily formed, and the entire inside of the tank can be rapidly and uniformly stirred and mixed.

以上より、本発明に係る攪拌装置は、攪拌軸の回転角が少なくても十分な流量の下降流が形成され、それに伴って十分な流量の上下循環流動が形成されて、高粘度から低粘度までの広い粘度域の流体を、槽内の全体に亘って速やか且つ均一に攪拌混合することができるようになる。   As described above, the stirring device according to the present invention forms a downward flow with a sufficient flow rate even if the rotation angle of the stirring shaft is small, and accordingly a vertical flow with a sufficient flow rate is formed. It becomes possible to rapidly and uniformly stir and mix the fluid having a wide viscosity range up to the entire inside of the tank.

以下、本発明の第一実施形態について、添付図面を参照しつつ説明する。   Hereinafter, a first embodiment of the present invention will be described with reference to the accompanying drawings.

図１乃至図３に示すように、攪拌装置１は、円筒形攪拌槽２の中心部に、攪拌軸３が回転可能に支持されている。攪拌軸３は、下端が槽底部近傍まで垂下されている。また、上端は槽頂上部駆動装置（図示せず）にカップリング（図示せず）を介して接続されている。該攪拌軸３には、上部攪拌翼部４と下部攪拌翼５，５とが設けられている。   As shown in FIGS. 1 to 3, in the stirring device 1, a stirring shaft 3 is rotatably supported at the center of a cylindrical stirring tank 2. The lower end of the stirring shaft 3 is suspended to the vicinity of the tank bottom. Moreover, the upper end is connected to the tank top drive device (not shown) via a coupling (not shown). The stirring shaft 3 is provided with an upper stirring blade portion 4 and lower stirring blades 5 and 5.

上部攪拌翼部４は、一対の上部攪拌翼６，６が攪拌軸３の軸芯方向に沿って一定間隔に複数段設けられることで構成されている。本実施形態においては、上から順に第一段、第二段、第三段の三段に構成されている。   The upper stirring blade portion 4 is configured by a plurality of stages of a pair of upper stirring blades 6 and 6 provided at regular intervals along the axial direction of the stirring shaft 3. In the present embodiment, the first, second, and third stages are configured in order from the top.

上部攪拌翼６は、平板状の攪拌翼で、側辺（上、下辺）６ａ、６ｂを半径とする扇形形状に形成されている。この上部攪拌翼６は、径方向（攪拌軸から槽壁方向）に向かって攪拌軸３の回転方向に幅広となる向きに、攪拌軸３を両側から挟むようにして取り付けられる。また、この一対の上部攪拌翼６，６は、攪拌軸３の回転方向（矢印α）に対して所定の上向き角度で傾斜させ、攪拌軸３に固定されている。   The upper stirring blade 6 is a flat stirring blade, and is formed in a fan shape with the sides (upper and lower sides) 6a and 6b as radii. The upper stirring blade 6 is attached so as to sandwich the stirring shaft 3 from both sides in a direction that becomes wider in the rotation direction of the stirring shaft 3 in the radial direction (from the stirring shaft to the tank wall direction). The pair of upper stirring blades 6 and 6 are fixed to the stirring shaft 3 by being inclined at a predetermined upward angle with respect to the rotation direction (arrow α) of the stirring shaft 3.

この傾斜角（上向き角度）は、第一段の一対の上部攪拌翼６，６から第二段の一対の上部攪拌翼６’，６’へ、第二段の一対の上部攪拌翼６’，６’から第三段の一対の上部攪拌翼６”，６”へと攪拌時に液が連続的に流動するような角度であれば良い。   This inclination angle (upward angle) is from the first pair of upper stirring blades 6, 6 to the second pair of upper stirring blades 6 ′, 6 ′. Any angle may be used so long as the liquid continuously flows from 6 'to the pair of upper stirring blades 6 ", 6" in the third stage.

尚、上部攪拌翼６は、本実施形態においては平滑な扇形の平板状であるが、これに限定される必要はなく、湾曲したような形状でも良く、表面が平滑でなく液の流動方向に沿って溝や凸条等が設けられていても良い。また、連続的ではなく断続的な平板状であっても良い。さらに、扇形形状に限定される必要もなく、中抜き扇形形状や矩形状等であっても良い。   The upper agitating blade 6 is a smooth fan-shaped flat plate in the present embodiment, but is not limited to this, and may have a curved shape. A groove, a ridge, etc. may be provided along. Further, it may be an intermittent flat plate shape instead of continuous. Furthermore, it is not necessary to be limited to the fan shape, and may be a hollow fan shape, a rectangular shape, or the like.

第二段の上部攪拌翼６’は、対応する第一段の上部攪拌翼６よりも回転方向に対し後退側（矢印αと反対側）に設けられている。このとき、第二段の上部攪拌翼６’は、軸長方向において、対応する第一段の上部攪拌翼６の下辺６ｂ（回転方向後退側端部）側から第二段の上部攪拌翼６’の下部側が見える位置（部位）に設けられている。そして、第三段の上部攪拌翼６”も同様に、軸長方向において、対応する前記第二段の上部攪拌翼６’の下辺６’ｂ側からその下部側が見える位置に設けられている。このように、対応する上部攪拌翼６，６’，６”がそれぞれ下段に行くほど回転方向に対し後退側にずれるように配設されることで、軸長方向において、上部攪拌翼部４は、それぞれ側辺６ａ，６”ｂのなす角度が約９０°の一対の扇形形状が攪拌軸３を対向して挟むように配設されている。   The second stage upper agitating blade 6 ′ is provided on the retreating side (opposite to the arrow α) with respect to the rotational direction than the corresponding first stage upper agitating blade 6. At this time, the second stage upper agitating blade 6 ′ has a second stage upper agitating blade 6 ′ from the lower side 6 b (reverse side end in the rotational direction) side of the corresponding first stage upper agitating blade 6 in the axial direction. It is provided at a position (part) where the lower side of 'is visible. Similarly, the third stage upper stirring blade 6 ″ is also provided in the axial direction at a position where the lower side can be seen from the lower side 6′b side of the corresponding second stage upper stirring blade 6 ′. In this way, the corresponding upper stirring blades 6, 6 ′, 6 ″ are arranged so as to be shifted backward with respect to the rotational direction as they go to the lower stage, so that the upper stirring blade portion 4 is in the axial direction. A pair of fan shapes each having an angle formed by the sides 6a, 6 ″ b of about 90 ° are arranged so as to sandwich the stirring shaft 3 facing each other.

従って、軸長方向において、回転方向に沿って、一方の扇形形状の上部攪拌翼部４、槽底面Ｒ、他方の扇形形状の上部攪拌翼部４、槽底面Ｒの順に交互に現れるような配置となる。   Accordingly, in the axial length direction, the arrangement is such that one fan-shaped upper stirring blade portion 4, the tank bottom surface R, the other fan-shaped upper stirring blade portion 4, and the tank bottom surface R appear alternately in the axial direction. It becomes.

尚、本実形態において、上部攪拌翼６（６’，６”）の上辺６ａ（６’ａ，６”ａ）と下辺６ｂ（６’ｂ，６”ｂ）とのなす角は、全ての段において同一であるが、各段毎に異なっていても良い。また、対向する一対の上部攪拌翼６，６の前記上下辺のなす角同士の角度が異なっていても良い。   In this embodiment, the angle formed by the upper side 6a (6′a, 6 ″ a) and the lower side 6b (6′b, 6 ″ b) of the upper stirring blade 6 (6 ′, 6 ″) Although it is the same in each step, it may be different for each step, and the angle formed by the upper and lower sides of the pair of opposed upper stirring blades 6 and 6 may be different.

また、前記第一段の上部攪拌翼６の下辺６ｂと対応する第二段の上部攪拌翼６’の下辺６’ｂとのなす角、及び、前記第二段の上部攪拌翼６’の下辺６’ｂと対応する第三段の上部攪拌翼６”の下辺６”ｂとのなす角は、本実施形態においては全て同一になるように配設されているが、同一でなく異なっていても良い。また、第一段と第二段、及び第二段と第三段の一対の上部攪拌翼６，６の攪拌軸３方向の間隔も一定である必要はない。   Further, the angle formed by the lower side 6b of the second upper stirring blade 6 'corresponding to the lower side 6b of the first upper stirring blade 6 and the lower side of the second upper stirring blade 6'. In this embodiment, the angles formed by the lower side 6 ″ b of the third stage upper stirring blade 6 ″ corresponding to 6′b are all the same, but they are not the same but are different. Also good. Further, the distance between the pair of upper stirring blades 6 and 6 in the first stage and the second stage, and the second stage and the third stage in the direction of the stirring shaft 3 need not be constant.

さらに、軸長方向において、前記上部攪拌翼部４の側辺６ａ、６”ｂのなす角は、本実施形態においては約９０°であるが、これに限定される必要はない。また、軸長方向において、上部攪拌翼部４の攪拌軸３を挟んで位置する扇形形状の前記側辺６ａ、６”ｂのなす角は、共に同一である必要はなく、それぞれが異なる角度であっても良い。   Furthermore, in the axial length direction, the angle formed by the sides 6a, 6 ″ b of the upper stirring blade part 4 is about 90 ° in the present embodiment, but it is not necessary to be limited to this. In the longitudinal direction, the angles formed by the side edges 6a and 6 "b of the fan shape located across the stirring shaft 3 of the upper stirring blade part 4 do not have to be the same. good.

下部攪拌翼５，５は、攪拌軸３に沿って設けられた平板状の攪拌翼であり、下方に向かって径方向に幅広となるように形成されている。この下部攪拌翼５，５は、軸長方向において、第三段の一対の上部攪拌翼６”，６”の下辺６”ｂ、６”ｂに沿って径方向へ、且つ前記一対の上部攪拌翼６”，６”の下辺６”ｂ，６”ｂ近傍から下方に向かって延設されるように形成されている。   The lower stirring blades 5 and 5 are flat stirring blades provided along the stirring shaft 3, and are formed so as to widen in the radial direction downward. The lower stirring blades 5 and 5 are arranged in the axial direction in the radial direction along the lower sides 6 ″ b and 6 ″ b of the third pair of upper stirring blades 6 ″ and 6 ″ in the axial direction. The wings 6 ", 6" are formed so as to extend downward from the vicinity of the lower sides 6 "b, 6" b.

本実施形態に係る攪拌装置は、以上の構成からなり、次に、本実施形態に係る攪拌装置の攪拌特性について図４及び図５に基づき説明する。   The stirrer according to the present embodiment has the above-described configuration. Next, the stirrer characteristics of the stirrer according to the present embodiment will be described with reference to FIGS. 4 and 5.

攪拌軸３を矢印α方向に回転させることによって上部攪拌翼部４と下部攪拌翼５，５とが同方向に回転する。この時、第一段の上部攪拌翼６は、攪拌槽２内上部の液を下方に移動させる（矢印Ａ，Ａ’）。そして、第二段の上部攪拌翼６’は、対応する第一段の上部攪拌翼６により下方に移動された液をさらに下方に移動させると同時に、上部攪拌翼６’の表面及び裏面近傍の液を下方に移動させる（矢印Ｂ，Ｂ’）。さらに、第三段の上部攪拌翼６”は、対応する第一段及び第二段の上部攪拌翼６，６’により下方に移動された液をさらに槽２の底部方向に移動させると同時に、上部攪拌翼６”の表面及び裏面近傍の液を下方に移動させる（矢印Ｃ，Ｃ’）。   By rotating the stirring shaft 3 in the direction of the arrow α, the upper stirring blade portion 4 and the lower stirring blades 5 and 5 rotate in the same direction. At this time, the first stage upper stirring blade 6 moves the liquid in the upper part of the stirring tank 2 downward (arrows A and A '). The second stage upper agitating blade 6 ′ moves the liquid moved downward by the corresponding first stage upper agitating blade 6 further downward, and at the same time, near the front and back surfaces of the upper agitating blade 6 ′. The liquid is moved downward (arrows B and B ′). Further, the third stage upper stirring blade 6 ″ moves the liquid moved downward by the corresponding first stage and second stage upper stirring blades 6, 6 ′ further toward the bottom of the tank 2, The liquid in the vicinity of the front and back surfaces of the upper stirring blade 6 ″ is moved downward (arrows C and C ′).

より詳細に説明すると、傾斜翼を液中で回転させると、翼の表面（回転方向の面）側に正圧が発生し、裏面（回転方向と逆の面）側には負圧が発生する。そのため、第一段の上部攪拌翼６の裏面６ｄに発生する負圧によって該上部攪拌翼６の裏面６ｄ側近傍の液が引き込まれる。そして、この引き込まれた液が第二段の上部攪拌翼６’の裏面６’ｄに発生する負圧によって下方に引き込まれることで移動される（矢印Ａ）。さらに、第三段の上部攪拌翼６”の裏面６”ｄに発生する負圧によって下方に引き込まれることで下方に移動される（矢印Ｂ）。その後、下部攪拌翼５の裏面に発生する負圧によって液が引き込まれる（矢印Ｃ）。   More specifically, when the inclined blade is rotated in the liquid, a positive pressure is generated on the surface (surface in the rotation direction) side of the blade, and a negative pressure is generated on the back surface (surface opposite to the rotation direction). . Therefore, the liquid near the back surface 6d side of the upper stirring blade 6 is drawn by the negative pressure generated on the back surface 6d of the upper stirring blade 6 in the first stage. The drawn liquid is moved by being drawn downward by the negative pressure generated on the back surface 6'd of the second stage upper stirring blade 6 '(arrow A). Furthermore, it is moved downward by being drawn downward by the negative pressure generated on the back surface 6 ″ d of the upper stirring blade 6 ″ of the third stage (arrow B). Thereafter, the liquid is drawn by the negative pressure generated on the back surface of the lower stirring blade 5 (arrow C).

即ち、各段の上部攪拌翼６，６’，６”の裏面６ｄ，６’ｄ，６”ｄに発生する負圧部によって引き込まれた液が、対応する下段の上部攪拌翼又は下部攪拌翼５の裏面に発生する負圧部に順次引き込まれることによって槽上部の液は下方側に移動される。   That is, the liquid drawn in by the negative pressure part generated on the back surfaces 6d, 6'd, 6 "d of the upper stirring blades 6, 6 ', 6" of each stage corresponds to the lower stirring blades or lower stirring blades of the corresponding lower stage. The liquid in the upper part of the tank is moved downward by being sequentially drawn into the negative pressure portion generated on the back surface of the tank 5.

また、第一段の上部攪拌翼６の表面６ｃに生じる正圧と対応する第二段の上部攪拌翼６’の裏面６’ｄに生じる負圧とにより、第一段の上部攪拌翼６の下辺６ｂ部と対応する第二段の上部攪拌翼６’の上辺６’ａ部との重複部分に吸引力が発生する。   Further, the positive pressure generated on the surface 6c of the upper stirring blade 6 of the first stage and the negative pressure generated on the back surface 6'd of the upper stirring blade 6 'corresponding to the second stage, A suction force is generated at an overlapping portion between the lower side 6b portion and the upper side 6'a portion of the second upper stirring blade 6 'corresponding to the lower side 6b portion.

このため、まず第一段の上部攪拌翼６により下方に移動された攪拌槽２内の液が重複部分に引き込まれて（矢印Ａ’）さらに下方へ吐出される。そして、この重複部分からの液の流れは、対応する第二段の上部攪拌翼６’の回転によって生じている裏面側の負圧により、該上部攪拌翼６’の裏面６’ｄに沿って、対応するさらに下方の第三段の上部攪拌翼６”へ確実に引き込まれる（矢印Ｂ）。それと同時に、前記第二段の上部攪拌翼６’の表面６’ｃによって下方に移動された液も、該上部攪拌翼６’の下辺６’ｂ部と対応する第三段の上部攪拌翼６”の上辺６”ａ部との重複部分に引き込まれてさらに下方へ吐出される（矢印Ｂ’）。同様にして、第三段の上部攪拌翼６”により槽２の底部に（下部攪拌翼５，５）に液が引き込まれる（矢印Ｃ，Ｃ’）。   For this reason, first, the liquid in the stirring tank 2 moved downward by the first stage upper stirring blade 6 is drawn into the overlapping portion (arrow A ′) and further discharged downward. Then, the liquid flow from the overlapping portion is caused along the back surface 6′d of the upper stirring blade 6 ′ by the negative pressure on the back surface generated by the rotation of the corresponding second stage upper stirring blade 6 ′. Are reliably drawn into the corresponding lower third stage upper stirring blade 6 ″ (arrow B). At the same time, the liquid moved downward by the surface 6′c of the second stage upper stirring blade 6 ′. Is also drawn into an overlapping portion between the lower side 6'b portion of the upper stirring blade 6 'and the upper side 6 "a portion of the third stage upper stirring blade 6" and discharged further downward (arrow B'). Similarly, the liquid is drawn into the bottom of the tank 2 (lower stirring blades 5, 5) by the third upper stirring blade 6 "(arrows C, C ').

以上のようにして、上部攪拌翼部４によって、槽２上部の液が下部へ移動させられる。   As described above, the liquid in the upper part of the tank 2 is moved downward by the upper stirring blade part 4.

この時、軸長方向において、一対の扇形形状として現れる上部攪拌翼部４の各扇形形状の両側部６ａ，６”ｂのなす角がそれぞれ約９０°であることから、上部攪拌翼部４の上部（第一段の上部攪拌翼６の上部）に位置する液が下部（第三段の上部攪拌翼部６”の下部）に移動するまでに、攪拌軸３は約９０°だけ回転すれば良い。   At this time, since the angles formed by the fan-shaped side portions 6a and 6 ″ b of the upper stirring blade portion 4 appearing as a pair of fan shapes in the axial length direction are about 90 °, the upper stirring blade portion 4 If the liquid located in the upper part (upper part of the upper stirring blade 6 in the first stage) moves to the lower part (lower part of the upper stirring blade part 6 ″ in the third stage), the stirring shaft 3 is rotated by about 90 °. good.

従って、従来の攪拌装置２０では、攪拌軸２１を１８０°回転させなければ上部攪拌翼２２によって槽上部の液を下部へ移動できなかったのに対し（図１４乃至１６参照）、本実施形態においては、その約半分の回転角で行うことができるようになる。そのため、より少ない回転数（回転角）で従来の攪拌装置２０と同程度の攪拌混合を行うことができるようになる。   Therefore, in the conventional stirring apparatus 20, the liquid in the upper part of the tank cannot be moved to the lower part by the upper stirring blade 22 unless the stirring shaft 21 is rotated by 180 ° (see FIGS. 14 to 16). Can be performed at about half the rotation angle. Therefore, it becomes possible to perform stirring and mixing at the same level as the conventional stirring device 20 with a smaller number of rotations (rotation angle).

即ち、時間あたりの攪拌軸の回転数が同じであれば、従来の攪拌装置２０と比べると、本実施形態に係る攪拌装置１では、非常に短い時間で攪拌混合することができるようになる。   That is, if the number of rotations of the stirring shaft per time is the same, the stirring device 1 according to this embodiment can perform stirring and mixing in a very short time as compared with the conventional stirring device 20.

さらに、本実施形態においては、攪拌時に上部攪拌翼部４が槽２上部の液を効率よく下部攪拌翼側に移動できるため、このことによっても攪拌特性がさらに良くなる。   Furthermore, in this embodiment, since the upper stirring blade part 4 can move the liquid of the tank 2 upper part efficiently to the lower stirring blade side at the time of stirring, this also improves stirring characteristics.

即ち、上部攪拌翼が一枚の板状体によって構成された場合、攪拌軸を回転させると、該上部攪拌翼によって槽上部の液が前記上部攪拌翼に沿った方向に移動される。その際、前記上部攪拌翼は攪拌軸を中心に回転しているため、該上部攪拌翼に沿って下方側に移動する液も同方向に回転しながら下降するが、この回転による遠心力によって槽壁方向（径方向）へも移動する。   That is, when the upper stirring blade is constituted by a single plate-like body, when the stirring shaft is rotated, the liquid in the upper part of the tank is moved in the direction along the upper stirring blade by the upper stirring blade. At that time, since the upper stirring blade rotates about the stirring shaft, the liquid moving downward along the upper stirring blade also descends while rotating in the same direction. It also moves in the wall direction (radial direction).

そのため、槽上部の液は、前記上部攪拌翼によって槽下部側へ移動する前に径方向へも移動される。従って、前記上部攪拌翼は、槽上部の液を全て下部攪拌翼側に移動できないことから槽内における上下方向での良好な混合を速やかに得ることができない。   Therefore, the liquid in the upper part of the tank is moved in the radial direction before moving to the lower part of the tank by the upper stirring blade. Therefore, since the upper stirring blade cannot move all the liquid in the upper part of the tank to the lower stirring blade side, it is not possible to quickly obtain good mixing in the vertical direction in the tank.

しかし、本実施形態においては、前記のように、上段の上部攪拌翼の下辺部と、その下段の上部攪拌翼の上辺部との重複部分が、上段の上部攪拌翼表面で下方に押し下げた液を吸引して強制的に下方に移動させるため、遠心力による槽壁方向へ移動する液の量を減らすことができ、上部攪拌翼部４は、効率よく下部攪拌翼５，５側へ液を移動できるようになる。   However, in the present embodiment, as described above, the overlapping portion of the lower side of the upper stirring blade in the upper stage and the upper side of the upper stirring blade in the lower stage is pushed downward on the surface of the upper stirring blade. The amount of liquid that moves in the direction of the tank wall due to centrifugal force can be reduced, and the upper agitating blade section 4 efficiently moves the liquid to the lower agitating blade 5 and 5 side. You can move.

しかも、回転による遠心力によって液が槽壁側に移動したとしても、各上部攪拌翼６，６’，６”は、側壁に向かって回転方向に幅広の扇形形状に形成されているため、槽壁近傍の液をより多く下方側へ移動させることができる。その結果、各上部攪拌翼６，６’，６”から逸れて槽壁側に移動する液の量を減らすことができ、上部攪拌翼部４によって下部攪拌翼５，５側に吐出される液量は多くなる。   Moreover, even if the liquid moves to the tank wall side due to the centrifugal force due to rotation, the upper stirring blades 6, 6 ′, 6 ″ are formed in a fan shape that is wide in the rotation direction toward the side wall. It is possible to move more liquid near the wall to the lower side. As a result, it is possible to reduce the amount of liquid that moves from the upper stirring blades 6, 6 ′, 6 ″ and moves to the tank wall side. The amount of liquid discharged to the lower stirring blades 5 and 5 side by the blade part 4 increases.

さらに、上部攪拌翼６は、扇形形状をしているため、槽壁方向へ近づく程、上段の上部攪拌翼と対応する下段の上部攪拌翼との重複部分の面積が大きくなり、より槽底方向（下方側）への吸引力が強くなる。そのため、槽壁方向への液の移動をより少なくして下方側へ移動する液の流量をより増加させることができる。   Furthermore, since the upper stirring blade 6 has a fan shape, the closer to the tank wall, the larger the area of the overlapping portion between the upper stirring blade in the upper stage and the corresponding upper stirring blade in the lower stage, and more toward the tank bottom. The suction force toward (lower side) becomes stronger. Therefore, it is possible to increase the flow rate of the liquid that moves downward by reducing the movement of the liquid in the tank wall direction.

以上のようにして槽２の底部側に移動された液は、下部攪拌翼５，５により径方向に吐出され（矢印Ｄ）、槽壁に衝突する。これにより、槽２内の液は槽壁に沿って上方に移動を始める。   The liquid moved to the bottom side of the tank 2 as described above is discharged in the radial direction by the lower stirring blades 5 and 5 (arrow D) and collides with the tank wall. Thereby, the liquid in the tank 2 starts to move upward along the tank wall.

このとき、図１４及び図１５に示すように、従前の攪拌装置２０では、一対の上部攪拌翼２２，２２が、軸長方向において、外周端が槽壁に沿うような半楕円形状に形成され、槽底面全体をほぼ覆うように配設されている。そのため、下部攪拌翼２３，２３から径方向へ吐出された液が槽壁に沿って上昇する際に、上部攪拌翼２２，２２外周端と槽壁との間隙を液が上昇するような循環流動を形成することになる。   At this time, as shown in FIGS. 14 and 15, in the conventional stirring device 20, the pair of upper stirring blades 22, 22 are formed in a semi-elliptical shape such that the outer peripheral end is along the tank wall in the axial direction. The tank is disposed so as to substantially cover the entire bottom surface of the tank. Therefore, when the liquid discharged in the radial direction from the lower stirring blades 23 and 23 rises along the tank wall, the circulation flow is such that the liquid rises through the gap between the outer peripheral ends of the upper stirring blades 22 and 22 and the tank wall. Will be formed.

図４及び図５に戻り、これに対し、本実施形態においては、上部攪拌翼部４と槽壁との間隙に加え、軸長方向において、上部攪拌翼部４が槽底面を覆っていない部位Ｒ，Ｒ（図３参照）においても液が上昇することができる。かかる部位Ｒ，Ｒにおいて十分な流量の液の上昇流が形成されることから、上部攪拌翼部４と槽壁との間隙を広く設ける必要がない。そのため、上部攪拌翼部４を構成する各上部攪拌翼６，６’，６”は、径方向へ十分な長さに形成することができ、即ち、槽壁と非常に近接した位置まで伸ばすことができる。従って、各上部攪拌翼６，６’，６”の面積をより大きくすることができ、下降流の流量をさらに多くすることができる。その結果、非常に流量の多い上下循環流動が槽２内に形成され、攪拌対象物を全体的に攪拌することができ、上下方向での非常に良好な攪拌特性を得ることができるようになる。   4 and 5, on the other hand, in this embodiment, in addition to the gap between the upper stirring blade portion 4 and the tank wall, the portion where the upper stirring blade portion 4 does not cover the tank bottom surface in the axial length direction. The liquid can also rise in R and R (see FIG. 3). Since the upward flow of the liquid having a sufficient flow rate is formed in the portions R and R, it is not necessary to provide a wide gap between the upper stirring blade portion 4 and the tank wall. Therefore, each of the upper stirring blades 6, 6 ′, 6 ″ constituting the upper stirring blade portion 4 can be formed in a sufficient length in the radial direction, that is, extended to a position very close to the tank wall. Accordingly, the area of each of the upper stirring blades 6, 6 ′, 6 ″ can be increased, and the flow rate of the downward flow can be further increased. As a result, a vertically circulating flow having a very large flow rate is formed in the tank 2, the stirring target can be stirred as a whole, and very good stirring characteristics in the vertical direction can be obtained. .

以上より、本実施形態に係る攪拌装置においては、攪拌軸の回転角が少なくても十分な流量の下降流が形成され、それに伴って槽内に十分な流量の上下循環流動が形成されて高粘度から低粘度までの広い粘度域の流体を、槽内の全体に亘って速やか且つ均一に攪拌混合することができるようになる。   As described above, in the agitation apparatus according to the present embodiment, a sufficient downward flow is formed even if the rotation angle of the agitation shaft is small. A fluid in a wide viscosity range from a viscosity to a low viscosity can be rapidly and uniformly stirred and mixed throughout the tank.

次に、本発明の第二実施形態体について説明する。第一実施形態に係る攪拌装置との構成上の相違点は、図６乃至図８に示すように、上部攪拌翼部１４の構成、及び下部攪拌翼１５，１５，１５の構成である。その他の点は、第一実施形態と同じであるため説明を省略する。また、構成の説明において、相違点以外は第一実施形態と同じ番号を用いて説明する。   Next, a second embodiment of the present invention will be described. The difference in configuration from the stirring device according to the first embodiment is the configuration of the upper stirring blade portion 14 and the configuration of the lower stirring blades 15, 15, 15 as shown in FIGS. 6 to 8. Since other points are the same as those of the first embodiment, description thereof is omitted. Moreover, in description of a structure, it demonstrates using the same number as 1st embodiment except a difference.

上部攪拌翼部１４は、攪拌軸３の周方向に沿って設けられた一組の上部攪拌翼６，６，６が攪拌軸３の軸方向に沿って一定間隔に複数段設けられることで構成されている。本実施形態においては、上から順に第一段、第二段、第三段の三段に構成されている。   The upper stirring blade part 14 is configured by a plurality of sets of upper stirring blades 6, 6, and 6 provided along the circumferential direction of the stirring shaft 3 are provided in a plurality of stages at regular intervals along the axial direction of the stirring shaft 3. Has been. In the present embodiment, the first, second, and third stages are configured in order from the top.

上部攪拌翼６，６，６は、周方向に沿って等間隔で攪拌軸３に固定されている。また、第一実施形態同様、攪拌軸３の回転方向に対して所定の上向き角度で傾斜させて固定されている。   The upper stirring blades 6, 6, 6 are fixed to the stirring shaft 3 at equal intervals along the circumferential direction. Moreover, like 1st embodiment, it inclines with the predetermined upward angle with respect to the rotation direction of the stirring shaft 3, and is being fixed.

そして、この一組の上部攪拌翼６，６，６は、第一実施形態同様、下段に行くほど回転方向に対し後退側にずれるように配設されることで、軸長方向において、上部攪拌翼部１４は、それぞれ側辺部６ａ，６”ｂのなす角度が約９０°の３つの扇形形状が攪拌軸３を中心に放射状に現れるように配設されている。   The pair of upper stirring blades 6, 6, 6 are arranged so as to be shifted backward with respect to the rotational direction as going to the lower stage as in the first embodiment, so that the upper stirring blade The wing part 14 is arranged so that three fan-shaped parts having an angle of about 90 ° formed by the side parts 6 a and 6 ″ b appear radially around the stirring shaft 3.

従って、軸長方向において、回転方向に沿って、順に扇形形状の上部攪拌翼部１４、槽底面Ｒ’が交互に現れるような配置となる。   Therefore, in the axial length direction, the arrangement is such that the fan-shaped upper stirring blade portion 14 and the tank bottom surface R ′ appear alternately in order along the rotation direction.

下部攪拌翼１５，１５，１５は、第一実施形態と同様、下方に向かって径方向に幅広となる平板状に形成され、軸長方向において、第三段の一組の上部攪拌翼６”，６”，６”の下辺６”ｂ，６”ｂ，６”ｂに沿って径方向に設けられている。   Similarly to the first embodiment, the lower stirring blades 15, 15, 15 are formed in a flat plate shape that becomes wider in the radial direction downward, and in the axial direction, a set of upper stirring blades 6 "in the third stage. , 6 ", 6" are provided in the radial direction along the lower sides 6 "b, 6" b, 6 "b.

本実施形態に係る攪拌装置は以上の構成からなる。そして、その攪拌特性については、第一実施形態同様、各段の上部攪拌翼の裏面に発生する負圧部に引き込まれた液が、その下段の攪拌翼（上部攪拌翼又は下部攪拌翼）の裏面に発生する負圧部に引き込まれることで下方に移動することにより、槽上部の液は下方側に向かって対応する上部攪拌翼６，６’，６”に沿って螺旋状に移動される（矢印Ａ，Ｂ，Ｃ）。また、上段の上部攪拌翼の下部と対応する下段の上部攪拌翼の上部との重複部分による吸引力、及び上部攪拌翼の表面前方側の液の押し下げによって、第一段の上部攪拌翼６から対応する第二段の上部攪拌翼６’へ（矢印Ａ’）、第二段の上部攪拌翼６’から対応する第三段の上部攪拌翼６”へ（矢印Ｂ’）、第三段の上部攪拌翼６”から対応する下部攪拌翼１５へ（矢印Ｃ’）、順に螺旋状に下降流が形成される。   The stirrer according to the present embodiment has the above configuration. And about the stirring characteristic, like 1st embodiment, the liquid drawn into the negative pressure part generated on the back surface of the upper stirring blade of each stage is the stirring blade (upper stirring blade or lower stirring blade) of the lower stage. By moving downward by being drawn into the negative pressure portion generated on the back surface, the liquid in the upper part of the tank is spirally moved along the corresponding upper stirring blades 6, 6 ′, 6 ″ toward the lower side. (Arrows A, B, C) In addition, by the suction force due to the overlapping portion between the lower part of the upper stirring blade in the upper stage and the upper part of the corresponding upper stirring blade in the upper stage, and the depression of the liquid on the front side of the surface of the upper stirring blade, From the first stage upper stirring blade 6 to the corresponding second stage upper stirring blade 6 ′ (arrow A ′), from the second stage upper stirring blade 6 ′ to the corresponding third stage upper stirring blade 6 ″ ( Arrow B ′), from the third stage upper stirring blade 6 ″ to the corresponding lower stirring blade 15 (arrow C ′) Turn downward flow spirally is formed.

下部攪拌翼１５に移動した液は、その後、槽壁方向へ吐出（矢印Ｄ）され、槽壁へ衝突した液は上昇を始める。この時、上昇する液は、上部攪拌翼部１４と槽壁との間隙、及び軸長方向における上部攪拌翼部１４の扇形形状間の部位Ｒ’において上昇する。   The liquid moved to the lower stirring blade 15 is then discharged in the direction of the tank wall (arrow D), and the liquid that has collided with the tank wall starts to rise. At this time, the rising liquid rises at the gap between the upper stirring blade portion 14 and the tank wall and at the portion R ′ between the fan-shaped shapes of the upper stirring blade portion 14 in the axial length direction.

このようにして、上下循環流動が形成されるが、この時、第一実施形態においては、上部攪拌翼部４の格段に一対（２枚）の上部攪拌翼６，６しか設けられていないため、前記下降流が２箇所しか形成されない。しかし、本実施形態においては、上部攪拌翼部１４の格段には３枚の上部攪拌翼６，６，６が設けられている。そのため、前記下降流は３箇所形成され、単位時間あたりの下降流の流量が多くなる。   In this way, a vertical circulation flow is formed. At this time, in the first embodiment, only a pair of (two) upper stirring blades 6 and 6 are provided in the upper stirring blade portion 4. The downflow is formed only in two places. However, in this embodiment, three upper stirring blades 6, 6, and 6 are provided in the upper stirring blade portion 14. Therefore, three downflows are formed, and the flow rate of the downflow per unit time increases.

従って、形成される上下循環流動の流量も、下降流の流量が多くなるのに伴って多くなる。その結果、上下方向でのより良好な攪拌特性を得ることができるようになり、高粘度から低粘度までの広い粘度域の流体を、槽内の全体に亘って速やか且つ均一に攪拌混合することができるようになる。   Therefore, the flow rate of the vertical circulation flow that is formed increases as the flow rate of the downward flow increases. As a result, better stirring characteristics in the vertical direction can be obtained, and a fluid in a wide viscosity range from high viscosity to low viscosity can be rapidly and uniformly stirred and mixed throughout the tank. Will be able to.

ここで、本発明者は、本発明の攪拌特性を実証すべく以下の実験を行った。   Here, the present inventor conducted the following experiment in order to verify the stirring characteristics of the present invention.

図９は、以下の条件で前記第一実施形態における流動解析（ＣＦＤ）を行い、その結果を示したものである。
＜解析条件＞
・槽内径（攪拌槽２の胴部の内径）：３１０ｍｍ
・バッフル（邪魔板）：無し
・液粘度：３Ｐａ・ｓ
・液密度：１０００ｋｇ／ｍ3
・攪拌動力：１．０ｋＷ／ｍ3 FIG. 9 shows the results of flow analysis (CFD) in the first embodiment under the following conditions.
<Analysis conditions>
-Tank inner diameter (inner diameter of the barrel of the stirring tank 2): 310 mm
・ Baffle: None ・ Liquid viscosity: 3 Pa ・ s
・ Liquid density: 1000 kg / m 3
・ Agitation power: 1.0 kW / m 3

上記解析条件でＣＦＤ（Computational Fluid Dynamics：計算流体力学）解析を行った結果、図９（イ）は、上部攪拌翼部４の対応する上部攪拌翼６，６’，６”が存在する回転位相での流動状態を示すものであり、図９（ロ）は、上部攪拌翼部４の対応する上部攪拌翼６，６’，６”が存在しない回転位相での流動状態を示すものである。この結果から、上部攪拌翼部４の対応する上部攪拌翼６，６’，６”が存在する位相では、槽上部から槽下部にかけて流速の大きい下降流が多く（図９（イ）の矢印参照）、一気に槽上部から槽底まで液が移動する。また、上部攪拌翼部４の対応する上部攪拌翼６，６’，６”が存在しない位相では、流速の大きい上昇流が連続して槽下部から上部にまで達していることがわる（図９（ロ）の矢印参照）。従って、流速の大きい上下循環流動が槽内に形成されていることがわかる。   As a result of CFD (Computational Fluid Dynamics) analysis under the above analysis conditions, FIG. 9A shows the rotational phase in which the upper stirring blades 6, 6 ′, 6 ″ corresponding to the upper stirring blade portion 4 exist. FIG. 9B shows a flow state in a rotational phase where the corresponding upper stirring blades 6, 6 ′, 6 ″ of the upper stirring blade portion 4 do not exist. From this result, in the phase where the corresponding upper stirring blades 6, 6 ', 6 "exist in the upper stirring blade portion 4, there are many descending flows having a large flow velocity from the upper portion of the tank to the lower portion of the tank (see arrows in FIG. 9 (a)). ), The liquid moves from the top of the tank to the bottom of the tank at a stroke. Also, in the phase where the upper stirring blades 6, 6 ′, 6 ″ corresponding to the upper stirring blade portion 4 do not exist, the upward flow having a large flow velocity continues. It can be seen from the bottom to the top (see arrows in FIG. 9B). Therefore, it can be seen that a vertical circulation flow having a high flow velocity is formed in the tank.

また、図１０は、攪拌装置の混合性能を評価するためにヨウ素還元脱色法を用い、その状態を０秒から１秒毎に写真撮影を行い、その写真を左から順に並べたものである。上段は、従来の上部攪拌翼部が軸長方向において槽底面全体をほぼ覆うように配設された攪拌装置を用いたものであり、下段は、本願発明の第一実施形態に係る攪拌装置を用いたものである。   FIG. 10 shows an iodine reduction decoloring method for evaluating the mixing performance of the stirring device, and the state is photographed every 0 to 1 second, and the photographs are arranged in order from the left. The upper stage uses a stirrer in which the conventional upper stirring blade part is disposed so as to substantially cover the entire tank bottom surface in the axial direction, and the lower stage shows the stirrer according to the first embodiment of the present invention. It is what was used.

このヨウ素還元脱色法では、槽内の液をヨウ素で赤色に着色し、脱色剤（チオ硫酸ナトリウム）を槽上部よりを投入してから攪拌を行うことで槽内の液の脱色が進み、その進み具合によって攪拌性能が評価できる。そして図１０より、本発明に係る攪拌装置では８秒で脱色され、従来の攪拌装置では１１秒で脱色されていることから、本願発明に係る攪拌装置の攪拌性能は、従来の攪拌装置の攪拌性能よりも高いと評価できる。   In this iodine reduction decolorization method, the liquid in the tank is colored red with iodine, and the decolorizing agent (sodium thiosulfate) is added from the top of the tank and then stirred, the decolorization of the liquid in the tank proceeds. The stirring performance can be evaluated by the progress. From FIG. 10, the stirring device according to the present invention is decolored in 8 seconds, and the conventional stirring device is decolored in 11 seconds. Therefore, the stirring performance of the stirring device according to the present invention is that of the conventional stirring device. It can be evaluated that it is higher than the performance.

以上より、本願発明に係る攪拌装置では、流速が大きく、槽の上部から下部にかけて大きな上下循環流動が槽内に形成されていることが確認できた。また、従来の攪拌装置よりも攪拌性能が極めて高くなっているとの評価も得ることができた。   From the above, in the stirring apparatus according to the present invention, it was confirmed that the flow rate was large and a large vertical circulation flow was formed in the tank from the upper part to the lower part of the tank. Moreover, evaluation that stirring performance was extremely higher than the conventional stirring apparatus was also able to be obtained.

尚、本発明に係る攪拌装置は、上記第一及び第二実施形態に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で種々の変更が可能である。   In addition, the stirring apparatus which concerns on this invention is not limited to said 1st and 2nd embodiment, A various change is possible in the range which does not deviate from the summary of this invention.

例えば、第一実施形態においては、上部攪拌翼６は攪拌軸３に固定されているが、固定されていなくても良い。即ち、上部攪拌翼部４を構成する上部攪拌翼６の段数を変更可能にしても良く、攪拌軸３に対する上部攪拌翼６の傾斜角を変更可能にしても良い。また、上部攪拌翼６の攪拌軸３への取り付け位置を変更可能にしても良い。   For example, in the first embodiment, the upper stirring blade 6 is fixed to the stirring shaft 3, but may not be fixed. That is, the number of stages of the upper stirring blade 6 constituting the upper stirring blade portion 4 may be changed, and the inclination angle of the upper stirring blade 6 with respect to the stirring shaft 3 may be changed. Moreover, you may enable it to change the attachment position to the stirring shaft 3 of the upper stirring blade 6. FIG.

このような構成とすることで、攪拌対象物（液）の量や粘度等が変わっても、槽２内の上下循環流動の流量が多くなるように、上部攪拌翼６の攪拌軸３に対する角度や、上部攪拌翼６と攪拌軸３との接続位置を変更調整することで、最も良い攪拌特性を容易に得ることができるようになる。   By adopting such a configuration, the angle of the upper stirring blade 6 with respect to the stirring shaft 3 is increased so that the flow rate of the vertical circulation flow in the tank 2 increases even if the amount or viscosity of the stirring object (liquid) changes. Alternatively, the best stirring characteristics can be easily obtained by changing and adjusting the connection position of the upper stirring blade 6 and the stirring shaft 3.

また、上部攪拌翼部４は、３段の一対の上部攪拌翼６，６，…で構成されるが、２段であっても良く、４段以上であっても良い。   Moreover, although the upper stirring blade part 4 is comprised by a pair of 3 steps | paragraphs of upper stirring blades 6, 6, ..., it may be 2 steps | paragraphs and may be 4 steps | paragraphs or more.

また、上部攪拌翼部４の各段における上部攪拌翼６の枚数は、２又は３枚に限定する必要はなく、４枚以上であっても良い。   Further, the number of upper stirring blades 6 in each stage of the upper stirring blade portion 4 is not limited to two or three, and may be four or more.

また、下部攪拌翼５，５は、一枚の平板状に下部に向かって径方向へ幅広に形成されているが、これに限定される必要はなく、上下同幅であっても良く、また、上下に分割されて複数の平板で構成されていても良い。さらに、先端部が屈曲していても良い。   Further, the lower stirring blades 5 and 5 are formed in a single flat plate shape so as to be wide in the radial direction toward the lower portion. However, the lower stirring blades 5 and 5 are not limited to this, and may have the same vertical width. The upper and lower parts may be divided into a plurality of flat plates. Furthermore, the tip may be bent.

第一実施形態に係る攪拌装置の正面図を示す。The front view of the stirring apparatus which concerns on 1st embodiment is shown. 同実施形態に係る攪拌装置の側面図を示す。The side view of the stirring apparatus which concerns on the same embodiment is shown. 同実施形態に係る攪拌装置のＡ−Ａ断面図を示す。The AA sectional view of the stirring device concerning the embodiment is shown. 同実施形態に係る攪拌装置の攪拌翼の一方側からの概念斜視図を示す。The conceptual perspective view from the one side of the stirring blade of the stirring apparatus which concerns on the same embodiment is shown. 同実施形態に係る攪拌装置の攪拌翼の他方側からの概念斜視図を示す。The conceptual perspective view from the other side of the stirring blade of the stirring apparatus which concerns on the embodiment is shown. 第二実施形態に係る攪拌装置の攪拌翼の一方側からの概念斜視図を示す。The conceptual perspective view from one side of the stirring blade of the stirring apparatus which concerns on 2nd embodiment is shown. 同実施形態に係る攪拌装置の攪拌翼の他方側からの概念斜視図を示す。The conceptual perspective view from the other side of the stirring blade of the stirring apparatus which concerns on the embodiment is shown. 同実施形態に係る攪拌装置の攪拌翼の平面図を示す。The top view of the stirring blade of the stirring apparatus which concerns on the embodiment is shown. 第一実施形態に係る攪拌装置のＣＦＤの結果で、（イ）は、上部攪拌翼部が存在する位相での流動状態を示すものであり、（ロ）は、上部攪拌翼部が存在しない位相での流動状態を示す図である。As a result of CFD of the stirrer according to the first embodiment, (A) shows the flow state in the phase where the upper stirring blade part exists, and (B) shows the phase where the upper stirring blade part does not exist. It is a figure which shows the fluid state in. 同実施形態に係る攪拌装置と従来の攪拌装置とのヨウ素還元脱色法を用いた攪拌性能の対比実験の結果を示す。The result of the comparison experiment of the stirring performance using the iodine reduction decoloring method of the stirring apparatus which concerns on the same embodiment, and the conventional stirring apparatus is shown. 従来の小型翼に係る攪拌装置の攪拌特性を説明するための概念図を示す。The conceptual diagram for demonstrating the stirring characteristic of the stirring apparatus which concerns on the conventional small blade is shown. 従来の大型の平板型翼に係る攪拌装置の攪拌特性を説明するための概念図を示す。The conceptual diagram for demonstrating the stirring characteristic of the stirring apparatus which concerns on the conventional large sized flat blade | wing is shown. 従来の上部攪拌翼と下部攪拌翼とを備える攪拌装置の正面図を示す。The front view of the stirring apparatus provided with the conventional upper stirring blade and the lower stirring blade is shown. 従来の上部攪拌翼と下部攪拌翼とを備える攪拌装置の側面図を示す。The side view of the conventional stirring apparatus provided with the upper stirring blade and the lower stirring blade is shown. 従来の上部攪拌翼と下部攪拌翼とを備える攪拌装置の平面図を示す。The top view of the conventional stirring apparatus provided with the upper stirring blade and the lower stirring blade is shown.

符号の説明Explanation of symbols

１…攪拌装置、２…攪拌槽、３…攪拌軸、４，１４…上部攪拌翼部、５，１５…下部攪拌翼、６，６’，６”…上部攪拌翼、６ａ，６’ａ，６”…上部攪拌翼の上辺、６ｂ，６’ｂ，６”ｂ…上部攪拌翼の下辺、６ｃ，６’ｃ，６”ｃ…上部攪拌翼の表面（回転方向の面）、６ｄ，６’ｄ，６”ｄ…上部攪拌翼の裏面（回転方向と反対側の面）、Ａ，Ａ’，Ｂ，Ｂ’，Ｃ，Ｃ’，Ｄ…液の流れ   DESCRIPTION OF SYMBOLS 1 ... Stirring apparatus, 2 ... Stirrer tank, 3 ... Stirring shaft, 4,14 ... Upper stirring blade part, 5,15 ... Lower stirring blade, 6, 6 ', 6 "... Upper stirring blade, 6a, 6'a, 6 "... upper side of upper stirring blade, 6b, 6'b, 6" b ... lower side of upper stirring blade, 6c, 6'c, 6 "c ... surface of upper stirring blade (surface in rotation direction), 6d, 6 'd, 6 "d ... Back surface of upper stirring blade (surface opposite to rotation direction), A, A', B, B ', C, C', D ... Flow of liquid

Claims (5)

攪拌槽内中心部に槽外から回転可能な攪拌軸が配設され、該攪拌軸に配設される上部攪拌翼部と該上部攪拌翼部下端近傍から槽底面近傍まで垂下し且つ攪拌軸から径方向に延設される平板状の下部攪拌翼とを備える攪拌装置であって、前記上部攪拌翼部は、複数の上部攪拌翼が前記攪拌軸の周方向に沿って所定間隔に且つ前記攪拌軸の回転方向に対して所定の上向き角度で傾斜して設けられることで構成される一組の上部攪拌翼を複数段備え、
前記各段の対応する上部攪拌翼は、上段の上部攪拌翼と下段の上部攪拌翼とが、軸長方向において、前記上段の上部攪拌翼の下辺側から前記下段の上部攪拌翼の下辺側が見えるように重なる位置にそれぞれ配設されると共に、最上段の上部攪拌翼の上辺から最下段の上部攪拌翼の下辺までの攪拌軸を中心とする回転方向に対する角度が１８０°より小さくなるように配設されることを特徴とする攪拌装置。 A stirring shaft that can be rotated from the outside of the tank is disposed in the central portion of the stirring tank, and is suspended from the bottom of the upper stirring blade and the bottom of the upper stirring blade to the vicinity of the bottom of the tank. A stirring device comprising a flat lower stirring blade extending in a radial direction, wherein the upper stirring blade portion includes a plurality of upper stirring blades at predetermined intervals along a circumferential direction of the stirring shaft. Provided with a plurality of stages of a set of upper stirring blades configured by being inclined at a predetermined upward angle with respect to the rotational direction of the shaft,
The upper stirring blade corresponding to each of the upper stages is such that the upper stirring blade of the upper stage and the upper stirring blade of the lower stage are visible in the axial direction from the lower side of the upper stirring blade of the upper stage. Are arranged at such overlapping positions, and the angle from the upper side of the upper stirring blade at the uppermost stage to the lower side of the upper stirring blade at the lowermost stage with respect to the rotation direction around the stirring axis is smaller than 180 °. A stirrer characterized by being provided. 攪拌槽内中心部に槽外から回転可能な攪拌軸が配設され、該攪拌軸に配設される上部攪拌翼部と該上部攪拌翼部下端近傍から槽底面近傍まで垂下し且つ攪拌軸から径方向に延設される平板状の下部攪拌翼とを備える攪拌装置であって、前記上部攪拌翼部は、複数の上部攪拌翼が前記攪拌軸の周方向に沿って所定間隔に且つ前記攪拌軸の回転方向に対して所定の上向き角度で傾斜して設けられることで構成される一組の上部攪拌翼を複数段備え、前記各段の対応する上部攪拌翼は、上段の上部攪拌翼と下段の上部攪拌翼とが、軸長方向において、前記上段の上部攪拌翼の下辺側から前記下段の上部攪拌翼の下辺側が見えるように重なる位置にそれぞれ配設されると共に、軸長方向において、攪拌槽底面を、攪拌軸を中心とする回転方向に対して所定の角度だけ覆うように配設されることを特徴とする攪拌装置。   A stirring shaft that can be rotated from the outside of the tank is disposed in the central portion of the stirring tank, and is suspended from the bottom of the upper stirring blade and the bottom of the upper stirring blade to the vicinity of the bottom of the tank. A stirring device comprising a flat lower stirring blade extending in a radial direction, wherein the upper stirring blade portion includes a plurality of upper stirring blades at predetermined intervals along a circumferential direction of the stirring shaft. A plurality of upper stirring blades each having a set of upper stirring blades configured to be inclined at a predetermined upward angle with respect to the rotation direction of the shaft, and the upper stirring blades corresponding to each of the stages have upper upper stirring blades and The lower upper agitating blades are arranged in positions that overlap each other so that the lower side of the lower upper agitating blade can be seen from the lower side of the upper upper agitating blade in the axial direction, and in the axial direction, Rotate the bottom of the stirring tank with respect to the direction of rotation about the stirring axis Stirring device, characterized in that it is disposed to cover only a constant angle. 前記上部攪拌翼は、攪拌槽内壁面に向かって回転方向に幅広となる扇形形状に形成されることを特徴とする請求項１又は２記載の攪拌装置。   The stirring device according to claim 1, wherein the upper stirring blade is formed in a fan shape that becomes wider in a rotation direction toward an inner wall surface of the stirring tank. 前記上部攪拌翼は、その攪拌槽内壁面側の外周端が前記内壁面に近接した形状であることを特徴とする請求項３記載の攪拌装置。   The stirring device according to claim 3, wherein the upper stirring blade has a shape in which an outer peripheral end on the inner wall surface side of the upper stirring blade is close to the inner wall surface. 前記下部攪拌翼は、攪拌槽底面に向かって径方向に幅広となることを特徴とする請求項１乃至４のいずれか一項に記載の攪拌装置。   The stirring device according to any one of claims 1 to 4, wherein the lower stirring blade becomes wider in a radial direction toward a bottom surface of the stirring tank.
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