JP4935416B2 - Stirring tank - Google Patents

Stirring tank Download PDF

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JP4935416B2
JP4935416B2 JP2007044091A JP2007044091A JP4935416B2 JP 4935416 B2 JP4935416 B2 JP 4935416B2 JP 2007044091 A JP2007044091 A JP 2007044091A JP 2007044091 A JP2007044091 A JP 2007044091A JP 4935416 B2 JP4935416 B2 JP 4935416B2
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diameter
tank
plate
shaft
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JP2008207069A (en
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光春 寺嶋
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Kurita Water Industries Ltd
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Description

本発明は撹拌槽に係り、特に槽体内部が仕切板によって上下複数の室に区画され、槽体中央に軸体が上下方向に設けられ、この軸体に翼体が設けられた撹拌槽の改良に関する。   The present invention relates to an agitation tank, and in particular, an interior of a tank body is partitioned into a plurality of upper and lower chambers by a partition plate, a shaft body is provided in the vertical direction in the center of the tank body, and a stirring tank provided with a wing body on the shaft body. Regarding improvement.

この種の撹拌槽の従来例として、実公昭５７−６０８０９号に記載のものがある。同号の撹拌槽では、中央に開口（同号公報では透孔と称している。）を有した仕切板を槽体内に上下３段に配置して、槽体内を４室に区画している。   A conventional example of this type of agitation tank is described in Japanese Utility Model Publication No. 57-60809. In the stirring tank of the same number, a partition plate having an opening at the center (referred to as a through hole in the same number publication) is arranged in three upper and lower stages in the tank body, and the tank body is divided into four chambers. .

また、鉛直方向に延在する回転軸を透孔中央に挿通配置し、この回転軸に、上下４段に円形板体（同号公報ではシュラウドと称している。）を取り付け、１つの室に１つのシュラウドを配置している。シュラウドの下面に撹拌翼が取り付けられている。シュラウドの直径は、透孔よりも僅かに小さいものとなっている（同号公報４欄３〜４行）。水は槽体の下部に供給され、撹拌された水が槽体の上部から流出する。
実公昭５７−６０８０９号公報 In addition, a rotating shaft extending in the vertical direction is inserted in the center of the through hole, and a circular plate body (referred to as a shroud in the same publication) is attached to the rotating shaft in four upper and lower stages. One shroud is arranged. A stirring blade is attached to the lower surface of the shroud. The diameter of the shroud is slightly smaller than the through-hole (the same publication gazette 4, column 3-4). Water is supplied to the lower part of the tank body, and the agitated water flows out from the upper part of the tank body.
Japanese Utility Model Publication No. 57-60809

上記実公昭５７−６０８０９号公報の撹拌槽にあっては、円形板状のシュラウドが仕切板の透孔から比較的離隔している。そのため、水が透孔を通って上側の室へ短絡的に流出し、撹拌が不十分となるおそれがある。   In the stirring tank disclosed in the Japanese Utility Model Publication No. 57-60809, a circular plate-like shroud is relatively separated from the through hole of the partition plate. Therefore, water may flow out in a short circuit through the through hole to the upper chamber, and the stirring may be insufficient.

本発明は、このような従来技術の問題点を解決し、液が十分に撹拌される撹拌槽を提供することを目的とする。   The object of the present invention is to solve such problems of the prior art and to provide an agitation tank in which the liquid is sufficiently agitated.

本発明（請求項１）の撹拌槽は、上部及び下部の一方に液の導入部が設けられると共に他方に液の流出部が設けられた槽体と、該槽体内に略水平に配置され、槽体内を複数の室に区画する仕切板と、該仕切板の中央部に設けられた開口と、該開口を通って上下方向に延在した軸体と、各室内において、それぞれ該軸体に取り付けられた翼体と、該軸体に取り付けられ、前記開口に対峙する板体と、該軸体を回転させる駆動装置と、を有する撹拌槽において、前記仕切板が１枚だけ設置され、前記導入部は槽体の上部に配置され、流出部は槽体の下部に配置され、前記板体の直径Ｄは前記開口の直径ｄよりも大であり、下側の室内に配置された前記翼体の旋回直径Ｗは該開口の直径ｄよりも小であり、前記駆動装置は槽体の上部又は上方に配置されており、該駆動装置は一方向に前記軸体を回転させるものであり、該翼体は、該軸体が該一方向に回転したときに該翼体から下方に向う液流を生じさせるものであり、該開口の上側に近接して前記板体が配置されていることを特徴とするものである。 The stirring tank of the present invention (Claim 1) is disposed substantially horizontally in a tank body in which a liquid introduction part is provided in one of the upper part and the lower part and a liquid outflow part is provided in the other part, A partition plate that divides the tank body into a plurality of chambers, an opening provided in a central portion of the partition plate, a shaft body extending vertically through the opening, and a shaft body in each chamber. In a stirring tank having an attached wing body, a plate body attached to the shaft body and facing the opening, and a driving device for rotating the shaft body, only one partition plate is installed, The introduction part is arranged in the upper part of the tank body, the outflow part is arranged in the lower part of the tank body, the diameter D of the plate body is larger than the diameter d of the opening, and the blades arranged in the lower chamber The swivel diameter W of the body is smaller than the diameter d of the opening, and the driving device is disposed above or above the tank body. The driving device rotates the shaft body in one direction, and the blade body generates a liquid flow downward from the blade body when the shaft body rotates in the one direction. are those, is characterized in that said plate member in proximity to the upper side of the opening is located.

請求項２の撹拌槽は、請求項１において、前記板体及び開口は略円形であり、該板体の直径Ｄと開口の直径ｄとの比Ｄ／ｄが１〜２であることを特徴とするものである。   The stirring tank of claim 2 is characterized in that, in claim 1, the plate body and the opening are substantially circular, and the ratio D / d between the diameter D of the plate body and the diameter d of the opening is 1-2. It is what.

請求項３の撹拌槽は、請求項２において、前記仕切板と該仕切板に近接した板体との間隔ｔと、前記板体の半径と前記開口の半径の差（Ｄ−ｄ）／２との比ｔ／｛（Ｄ−ｄ）／２｝が０．２〜５であることを特徴とするものである。 According to a third aspect of the present invention, there is provided the stirring tank according to the second aspect, wherein the distance t between the partition plate and the plate adjacent to the partition plate is the difference between the radius of the plate and the radius of the opening (Dd) / 2. The ratio t / {(D−d) / 2} is 0.2 to 5 .

請求項４の撹拌槽は、請求項１ないし３のいずれか１項において、前記板体の直径Ｄと前記翼体の旋回直径Ｗとの比Ｄ／Ｗが０．５〜２であることを特徴とするものである。 Stirred tank 請 Motomeko 4, it in any one of claims 1 to 3, the ratio D / W of the turning diameter W of the blade body and the diameter D of the plate member is 0.5 to 2 It is characterized by.

請求項５の撹拌槽は、請求項１ないし４のいずれか１項において、前記開口の直径ｄと翼体の旋回直径Ｗとの比ｄ／Ｗが１．０５〜１．５であることを特徴とするものである。 The stirring tank according to claim 5 is characterized in that, in any one of claims 1 to 4 , the ratio d / W between the diameter d of the opening and the turning diameter W of the blade body is 1.05 to 1.5. It is a feature .

本発明の撹拌槽では、液は槽体の上方から導入され、各室において撹拌され、槽体の下方から流出する。 The stirred tank of the present invention, the liquid is introduced from above the tank body, are stirred in each chamber, and flows out from the lower side of the tank body.

本発明では、各室を区画する仕切板に設けられた開口に対し、上側から近接するように板体を配置している。このため、１つの室から隣接する室へ液が短絡的に流れることが防止され、液が十分に撹拌される。 In the present invention, with respect to an opening provided in the partition plate for partitioning the chambers are arranged a plate member so as to close the upper side. For this reason, it is prevented that a liquid flows in a short circuit from one chamber to an adjacent chamber, and the liquid is sufficiently stirred.

本発明では、軸体を回転させたときに翼体から下方に向う液流が生じるように構成している。この翼体から下方に向かう液流は、板体に当って放射方向に広がり、次いで槽体内面に当って逆方向（上方）に向って流れるようになる。この結果、室内には、槽体内周面に沿って流出側の仕切板の開口から離れる方向に液が流れる循環流が形成されるようになり、液の短絡的な流出が十分に防止される。 In the present invention, it is configured such that the liquid flow toward the lower results from the blade body when rotating the shaft. The liquid flow directed downward from the wing body spreads radially in contact with the plate body, and then flows in the reverse direction ( upward ) against the inner surface of the tank body. As a result, a circulating flow in which the liquid flows in the direction away from the opening of the outlet-side partition plate along the peripheral surface of the tank body is formed in the room, and the short-circuit outflow of the liquid is sufficiently prevented. .

板体の直径Ｄを翼体の旋回直径Ｗの０．５倍以上とすることにより、液の短絡的な流れが十分に防止される。   By setting the diameter D of the plate body to 0.5 times or more the swirl diameter W of the wing body, the short-circuit flow of the liquid is sufficiently prevented.

本発明では、仕切板の数を１とし、板体を仕切板の上側に配置し、下側の室内の翼体の旋回直径を仕切板開口の直径よりも小さくしたことにより、軸体を槽体から上方に取り出すことができる。そのため、撹拌槽の保守管理が容易となる。 In the present invention, the number of partition plates and 1, by placing the plate member on the upper side of the partition plate is smaller than the diameter of the partition plate opening swivel diameter of the lower chamber of the blade body, the tank of the shaft It can be taken out from the body. Therefore, maintenance management of the stirring tank becomes easy.

以下、図面を参照して参考例及び実施の形態について説明する。第１図は参考例に係る撹拌槽の縦断面図である。 Hereinafter, reference examples and embodiments will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a stirring tank according to a reference example .

この撹拌槽１は、下部に流入口３を有し、上部に流出口４を有した槽体２と、この槽体２内を上下２室に区画する水平な仕切板５と、この仕切板５の中央に設けられた円形の開口６と、この開口６の中央を通り、上下方向に延設された軸体７と、この軸体７をその軸心回りに回転させる駆動装置８と、軸体７に取り付けられた翼体９及び円形の板体（第１の板体）１０とを備えている。   The agitation tank 1 has a tank body 2 having an inlet 3 in the lower part and an outlet 4 in the upper part, a horizontal partition plate 5 that partitions the tank body 2 into two upper and lower chambers, and the partition plate. A circular opening 6 provided in the center of the shaft 5, a shaft body 7 passing through the center of the opening 6 and extending in the vertical direction, and a drive device 8 for rotating the shaft body 7 about its axis, A wing body 9 attached to the shaft body 7 and a circular plate body (first plate body) 10 are provided.

翼体９は下側の室１１及び上側の室１２にそれぞれ配置されているが、板体１０は下側の室にのみ設けられている。板体１０は開口６に近接している。   The wing body 9 is disposed in each of the lower chamber 11 and the upper chamber 12, but the plate body 10 is provided only in the lower chamber. The plate 10 is close to the opening 6.

各部分の好ましい寸法は次の通りである。なお、槽体２は円筒形、楕円筒形、角筒形のいずれであってもよい。非円筒形の場合、その直径Ｌは最長径と最短径との中間値をいうものとする。   The preferred dimensions of each part are as follows. The tank body 2 may be any of a cylindrical shape, an elliptical cylindrical shape, and a rectangular cylindrical shape. In the case of a non-cylindrical shape, the diameter L is an intermediate value between the longest diameter and the shortest diameter.

翼体９の旋回直径Ｗと槽径Ｌとの比Ｗ／Ｌは０．０５〜０．６特に０．１〜０．３程度が好ましい。   The ratio W / L between the turning diameter W of the wing body 9 and the tank diameter L is preferably 0.05 to 0.6, particularly preferably about 0.1 to 0.3.

開口６の直径ｄと翼体９の旋回直径Ｗとの比ｄ／Ｗは１〜１．５特に１．０５〜１．２程度が好ましい。   The ratio d / W between the diameter d of the opening 6 and the turning diameter W of the blade body 9 is preferably about 1 to 1.5, particularly about 1.05 to 1.2.

板体１０の直径Ｄと開口６の直径ｄとの比Ｄ／ｄは１〜２、特に１．０５〜１．５程度が好ましい。   The ratio D / d between the diameter D of the plate 10 and the diameter d of the opening 6 is preferably about 1 to 2, particularly about 1.05 to 1.5.

板体１０の直径Ｄと翼体９の旋回直径Ｗとの比Ｄ／Ｗは０．５〜２、特に１〜１．５程度が好ましい。   The ratio D / W between the diameter D of the plate body 10 and the turning diameter W of the wing body 9 is preferably 0.5 to 2, particularly about 1 to 1.5.

板体１０と仕切板５との間隔ｔと、板体１０の半径と開口６の半径の差（Ｄ−ｄ）／２との比ｔ／｛（Ｄ−ｄ）／２｝は０．２〜５、特に０．５〜２程度が好ましい。板体１０の半径と開口６の半径の差（Ｄ−ｄ）／２は板体１０と仕切板５の重なる部分の幅であり、間隔ｔとこの半径の差（Ｄ−ｄ）／２との比が５より大きいと、下側の室１１内に設置された翼体９から板体１０の方向に向う流れが、板体１０の周囲から板体１０の上部にまわりこみ、開口６から上側の室１２に短絡する流れが生じやすくなる。また、０．２より小さいと、板体１０と仕切板５の間の流れの線速度が大きくなり、逆に下側の室１１にて十分な混合がなされていない液が上側の室１２に流れ込みやすくなる。   The ratio t / {(D−d) / 2} between the distance t between the plate 10 and the partition plate 5 and the difference (D−d) / 2 between the radius of the plate 10 and the radius of the opening 6 is 0.2. ~ 5, particularly about 0.5 to 2 is preferred. The difference (D−d) / 2 between the radius of the plate body 10 and the radius of the opening 6 is the width of the overlapping portion of the plate body 10 and the partition plate 5, and the distance t and the difference (D−d) / 2 between this radius and If the ratio is greater than 5, the flow from the wing body 9 installed in the lower chamber 11 toward the plate body 10 flows from the periphery of the plate body 10 to the upper part of the plate body 10 and from the opening 6 to the upper side. A short-circuiting flow is likely to occur in the chamber 12. On the other hand, if it is less than 0.2, the linear velocity of the flow between the plate 10 and the partition plate 5 increases, and conversely, the liquid that is not sufficiently mixed in the lower chamber 11 enters the upper chamber 12. It becomes easy to flow.

下側の室１１の翼体９は、駆動装置８が一方向に回転した場合に、翼体９から板体１０に向って軸体７に沿って流れる上向流（軸流）を生じさせる軸流型又は斜流型の羽を有するものが好ましい。羽形状は、プロペラ翼、ピッチパドル翼、ピッチドタービン翼、インペラなどが好適である。   The wing body 9 of the lower chamber 11 generates an upward flow (axial flow) that flows along the shaft body 7 from the wing body 9 toward the plate body 10 when the driving device 8 rotates in one direction. Those having axial or diagonal flow type wings are preferred. The blade shape is preferably a propeller blade, a pitch paddle blade, a pitched turbine blade, an impeller, or the like.

上側の室１２の翼体９は、仕切板５の上面に堆積物が堆積することを防止すると共に、開口６からの流入液が軸体７に沿って水面にまで短絡的に上昇することを防止するために、室１２内に翼体９から下向きの軸流を形成するものが好ましい。   The wing body 9 of the upper chamber 12 prevents deposits from accumulating on the upper surface of the partition plate 5 and prevents the inflowing liquid from the opening 6 from rising along the shaft body 7 to the water surface in a short-circuit manner. In order to prevent this, it is preferable to form a downward axial flow from the wing body 9 in the chamber 12.

このように構成された撹拌槽１において、液は流入口３から室１１に流入し、回転する翼体９によって撹拌される。液は翼体９によって上方に向って流れ、板体１０に当って放射方向に流れ方向を変え、槽体２の内壁面に当って下向きに流れ、その後、槽体２の底面に当って求心方向に流れ、室１１の底部中央において上向きに流れを変える。このように、室１１内に循環流が形成され、しかもこの循環流が板体１０に当って開口６には直接には到達しない方向の流れであるため、流入口３からの流入液が開口６から短絡的に流出することがない。また、板体１０を仕切板５に近接配置し、かつ板体１０の直径Ｄを開口６の直径ｄよりも大きくしているので、開口６への短絡的な液の流れが十分に防止される。このため、室１１内において液が十分に撹拌される。   In the agitation tank 1 configured as described above, the liquid flows into the chamber 11 from the inlet 3 and is agitated by the rotating wing body 9. The liquid flows upward by the wing body 9, hits the plate body 10, changes the flow direction in the radial direction, hits the inner wall surface of the tank body 2, and flows downward, and then hits the bottom surface of the tank body 2. Flows in the direction and changes upward in the center of the bottom of the chamber 11. In this way, a circulating flow is formed in the chamber 11, and this circulating flow hits the plate body 10 and is a flow in a direction that does not reach the opening 6 directly, so that the inflowing liquid from the inlet 3 opens. 6 does not flow out in a short circuit. Further, since the plate body 10 is disposed close to the partition plate 5 and the diameter D of the plate body 10 is larger than the diameter d of the opening 6, a short-circuited liquid flow to the opening 6 is sufficiently prevented. The For this reason, the liquid is sufficiently stirred in the chamber 11.

室１２内においては、室１１と同様に液が翼体９によって上方に流れ、水面付近で放射方向に流れ方向を変え、槽体２の内壁面に沿って下向きに流れ、その後、仕切板５に沿って求心方向に流れ、室１２の底部中央において上向きに流れを変える。室１１から開口６を介して上昇してきた流入液は、室１２内の中央の上昇流と合流することにより、効果的に撹拌されるようになる。   In the chamber 12, as in the chamber 11, the liquid flows upward by the wing body 9, changes the flow direction in the radial direction near the water surface, flows downward along the inner wall surface of the tank body 2, and then the partition plate 5. In the centripetal direction, and the flow is changed upward in the center of the bottom of the chamber 12. The inflowing liquid that has risen from the chamber 11 through the opening 6 is effectively agitated by joining with the central upward flow in the chamber 12.

［実施の形態］
上記参考例では、流出口４を槽体２の上部に配置しているが、本発明では、第２図の撹拌槽１Ａのように、槽体２Ａの下部に流出口４を配置している。 [Implementation of the form]
In the reference example, but are arranged an outlet 4 at the top of the tank body 2, in the present invention, as in the agitation tank 1A of FIG. 2, are arranged an outlet 4 in the lower portion of the tank body 2A .

この第２図の撹拌槽１Ａでは、板体１０は上側の室１２内に配置され、仕切板５に近接配置されている。流入口３の代わりに、給液用配管などの液導入部３Ａが槽体２Ａの上部に配置されている。   In the stirring tank 1 </ b> A of FIG. 2, the plate body 10 is disposed in the upper chamber 12 and is disposed close to the partition plate 5. Instead of the inflow port 3, a liquid introduction part 3 </ b> A such as a liquid supply pipe is arranged at the upper part of the tank body 2 </ b> A.

各室１１，１２内の翼体９は、各室１１，１２内の中央で下降流を生じさせるよう構成されている。   The wing body 9 in each chamber 11, 12 is configured to generate a downward flow at the center in each chamber 11, 12.

第２図のその他の構成は第１図と同様であり、同一符号は同一部分を示している。各部分の好ましい寸法も第１図と同様である。   The other structure of FIG. 2 is the same as that of FIG. 1, and the same code | symbol has shown the identical part. The preferred dimensions of each part are the same as in FIG.

この第２図の撹拌槽１Ａにおいて、導入部３Ａから室１２内に導入された液は、室１２内で十分に撹拌された後、室１１に送られ、さらに撹拌された後、流出口４から流出する。上側の室１２内では、翼体９から下向きに流れた液が板体１０に当って放射方向に流れを変えるようになり、開口６に直接的に流れ込むことがない。また、板体１０が開口６に近接し、かつ板体１０の直径Ｄが開口６の直径ｄよりも大きいので、室１２内の液が室１１へ短絡的に流出することがなく、室１１内において液が十分に撹拌される。   In the stirring tank 1A of FIG. 2, the liquid introduced into the chamber 12 from the introduction portion 3A is sufficiently stirred in the chamber 12, and then sent to the chamber 11 and further stirred, and then the outlet 4 Spill from. In the upper chamber 12, the liquid flowing downward from the wing body 9 hits the plate body 10 and changes its flow in the radial direction, and does not flow directly into the opening 6. Further, since the plate body 10 is close to the opening 6 and the diameter D of the plate body 10 is larger than the diameter d of the opening 6, the liquid in the chamber 12 does not flow out into the chamber 11 in a short circuit, and the chamber 11 The liquid is sufficiently stirred inside.

なお、この第２図の撹拌槽１内においては、板体１０が仕切板５の上側に配置され、翼体９の旋回直径Ｗが開口６の直径ｄよりも小さいものとなっているため、軸体７を翼体９及び板体１０が取り付けられたまま槽体２Ａから取り出すことができる。 2, the plate body 10 is disposed on the upper side of the partition plate 5, and the turning diameter W of the wing body 9 is smaller than the diameter d of the opening 6, The shaft body 7 can be taken out from the tank body 2A with the wing body 9 and the plate body 10 attached .

上記実施の形態では、仕切板５は水平であるが、若干傾斜していてもよい。また、開口６に向って、若干下り勾配となる切頭逆円錐形であってもよい。 In the form above Symbol embodiment, although the partition plate 5 is a horizontal, or may be slightly inclined. Further, it may be a truncated inverted cone having a slightly downward slope toward the opening 6.

本発明の撹拌槽は、水と凝集剤とを混合する用途に用いるのに好適である。この場合、最初に被処理水が導入される室において、又はこの室に導入される被処理水に対し凝集剤を添加すると共に、必要に応じｐＨ調整剤を添加するのが好ましい。凝集剤としては、ＰＡＣ、硫酸バンド、硫酸第二鉄などを用いることができる。   The stirring tank of the present invention is suitable for use in mixing water and a flocculant. In this case, it is preferable to add a flocculant in the chamber into which the water to be treated is first introduced or to the water to be treated introduced into this chamber, and to add a pH adjuster as necessary. As the flocculant, PAC, sulfate band, ferric sulfate, etc. can be used.

凝集処理に用いる場合、撹拌槽の室の数は２〜５程度が好適である。また、撹拌槽全体における水の滞留時間は３〜１５分程度が好適である。   When used for the agglomeration treatment, the number of chambers in the stirring tank is preferably about 2 to 5. Moreover, about 3 to 15 minutes are suitable for the residence time of the water in the whole stirring tank.

実施の形態に係る撹拌槽の縦断面図である。It is a longitudinal cross-sectional view of the stirring tank which concerns on embodiment. 第２の実施の形態に係る撹拌槽の縦断面図である。 It is a longitudinal cross-sectional view of the stirring tank which concerns on 2nd Embodiment .

１，１Ａ 撹拌槽
２，２Ａ 槽体
５ 仕切板
６ 開口
７ 軸体
９ 翼体
１１，１２ 室 1,1 A Agitating tank 2,2 A tank body 5 Partition plate 6 Opening 7 Shaft body 9 Wing body 11,12 chamber

Claims (5)

上部及び下部の一方に液の導入部が設けられると共に他方に液の流出部が設けられた槽体と、
該槽体内に略水平に配置され、槽体内を複数の室に区画する仕切板と、
該仕切板の中央部に設けられた開口と、
該開口を通って上下方向に延在した軸体と、
各室内において、それぞれ該軸体に取り付けられた翼体と、
該軸体に取り付けられ、前記開口に対峙する板体と、
該軸体を回転させる駆動装置と、
を有する撹拌槽において、
前記仕切板が１枚だけ設置され、
前記導入部は槽体の上部に配置され、流出部は槽体の下部に配置され、
前記板体の直径Ｄは前記開口の直径ｄよりも大であり、
下側の室内に配置された前記翼体の旋回直径Ｗは該開口の直径ｄよりも小であり、
前記駆動装置は槽体の上部又は上方に配置されており、
該駆動装置は一方向に前記軸体を回転させるものであり、
該翼体は、該軸体が該一方向に回転したときに該翼体から下方に向う液流を生じさせるものであり、
該開口の上側に近接して前記板体が配置されていることを特徴とする撹拌槽。 A tank body provided with a liquid introduction part on one of the upper part and the lower part and a liquid outflow part on the other, and
A partition plate disposed substantially horizontally in the tank body and dividing the tank body into a plurality of chambers;
An opening provided in the center of the partition plate;
A shaft extending vertically through the opening;
In each room, a wing attached to the shaft,
A plate attached to the shaft and facing the opening;
A driving device for rotating the shaft body;
In a stirring tank having
Only one partition plate is installed,
The introduction part is arranged at the upper part of the tank body, the outflow part is arranged at the lower part of the tank body,
The diameter D of the plate body is larger than the diameter d of the opening,
The swirl diameter W of the wing body disposed in the lower chamber is smaller than the diameter d of the opening,
The driving device is disposed above or above the tank body,
The drive device rotates the shaft body in one direction,
The wing body generates a liquid flow downward from the wing body when the shaft body rotates in the one direction.
Stirred tank, wherein the plate body is arranged close to the upper side of the opening. 請求項１において、前記板体及び開口は略円形であり、該板体の直径Ｄと開口の直径ｄとの比Ｄ／ｄが１〜２であることを特徴とする撹拌槽。   2. The stirring tank according to claim 1, wherein the plate body and the opening are substantially circular, and a ratio D / d between the diameter D of the plate body and the diameter d of the opening is 1-2. 請求項２において、前記仕切板と該仕切板に近接した板体との間隔ｔと、前記板体の半径と前記開口の半径の差（Ｄ−ｄ）／２との比ｔ／｛（Ｄ−ｄ）／２｝が０．２〜５であることを特徴とする撹拌槽。   In Claim 2, ratio t / {(D of the space | interval t of the said partition plate and the plate body adjacent to this partition plate, and the difference (Dd) / 2 of the radius of the said plate body, and the radius of the said opening. -D) / 2} is from 0.2 to 5, an agitation tank. 請求項１ないし３のいずれか１項において、前記板体の直径Ｄと前記翼体の旋回直径Ｗとの比Ｄ／Ｗが０．５〜２であることを特徴とする撹拌槽。 4. The stirring tank according to claim 1 , wherein a ratio D / W of the diameter D of the plate body and the turning diameter W of the blade body is 0.5 to 2. 5. 請求項１ないし４のいずれか１項において、前記開口の直径ｄと翼体の旋回直径Ｗとの比ｄ／Ｗが１．０５〜１．５であることを特徴とする撹拌槽。 The stirring tank according to any one of claims 1 to 4 , wherein a ratio d / W between the diameter d of the opening and the turning diameter W of the blade body is 1.05 to 1.5.
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