JP4040373B2 - Mechanism to prevent generation of water surface swirl in agitator - Google Patents

Mechanism to prevent generation of water surface swirl in agitator Download PDF

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Publication number
JP4040373B2
JP4040373B2 JP2002194532A JP2002194532A JP4040373B2 JP 4040373 B2 JP4040373 B2 JP 4040373B2 JP 2002194532 A JP2002194532 A JP 2002194532A JP 2002194532 A JP2002194532 A JP 2002194532A JP 4040373 B2 JP4040373 B2 JP 4040373B2
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Prior art keywords
hollow shaft
water surface
stirring blade
stirrer
vertical flat
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JP2004033916A (en
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誠一 田辺
浩輔 大出
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Hitachi Plant Technologies Ltd
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Hitachi Plant Technologies Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Mixers Of The Rotary Stirring Type (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、攪拌機における水面旋回流の発生防止機構、特に下水や汚水処理場にて使用する攪拌機、或いは曝気攪拌機（以下、本明細書において、「攪拌機」という。）において、攪拌機の駆動により水面に汚水の渦や旋回流れが生じるのを未然に防止するようにした攪拌機における水面旋回流の発生防止機構に関するものである。
【０００２】
【従来の技術】
従来、下水や汚水の処理場において、処理槽Ｐ内に設置して使用する攪拌機Ｓは、図４に示すように、水面上に配設した電動機５により回転する中空軸１の下端に、水面下となる位置に攪拌用羽根２を取り付け、該中空軸１の外周部を筒状のカバー４にて覆うように構成している。
この攪拌機Ｓにおいては、電動機５により中空軸１、攪拌用羽根２を回転させることにより、汚水は水面近くから吸い込まれて攪拌されつつ、攪拌用羽根２の下端より水槽底部に向かって押し出される水流ｃが発生し、処理槽Ｐ内の汚水の攪拌、又は必要に応じて曝気をも行うようにしている。
【０００３】
【発明が解決しようとする課題】
ところで、上記従来の攪拌機Ｓは、水面近くの汚水が攪拌用羽根２により吸い込まれるときに、水面近くから渦ｅや旋回流れｔが発生しやすく、このような渦ｅや旋回流れｔが生じると、攪拌用羽根２に流入する流れが変わり、攪拌機Ｓの負荷が変化したり、或いは攪拌用羽根２に渦を吸い込むときに騒音が生じるという問題があった。
【０００４】
本発明は、上記従来の攪拌機の有する問題点に鑑み、攪拌運転時に水面近くから渦や旋回流れを生じるのを未然に防ぐことができる攪拌機における水面旋回流の発生防止機構を提供することを目的とする。
【０００５】
【課題を解決するための手段】
上記目的を達成するため、本発明の攪拌機における水面旋回流の発生防止機構は、水面上に配設された電動機により回転する中空軸の水中部の下端に攪拌用羽根を取り付け、該攪拌用羽根の近傍に旋回流発生防止用羽根を取り付け、中空軸の外周を筒状のカバーにて覆うように構成した攪拌機において、旋回流発生防止用羽根を、攪拌用羽根の上部外周部位置にあたる筒状のカバーの外周に、中空軸と平行で、かつ該中空軸を中心に放射状に取 り付けた複数枚の垂直平板と、この放射状の垂直平板の上面で中空軸と直角となるように取り付けた円盤とより構成し、該円盤を、中空軸に対し直角で、攪拌用羽根外径の３〜８倍の範囲内で、放射状の垂直平板の外径と一致するように設定したことを特徴とする。
【０００６】
上記の構成からなる本発明の攪拌機における水面旋回流の発生防止機構は、攪拌用羽根の近傍に、旋回流発生防止用羽根を取り付けているので、攪拌用羽根の回転により水面位置の汚水を吸い込むときの水面での渦や旋回流の発生を抑えることができるため、攪拌機の負荷を一定にし、効率的な処理を行えるようにできるとともに、攪拌用羽根にて渦や旋回流を吸い込むこともなく、騒音の発生を抑制することができる。
【０００７】
そして、旋回流発生防止用羽根を、攪拌用羽根の上部外周部位置にあたる筒状のカバーの外周に、中空軸と平行で、かつ該中空軸を中心に放射状に取り付けた複数枚の垂直平板と、この放射状の垂直平板の上面で中空軸と直角となるように取り付けた円盤とより構成し、該円盤を、中空軸に対し直角で、攪拌用羽根外径の３〜８倍の範囲内で、放射状の垂直平板の外径と一致するように設定することにより、攪拌用羽根上部の水面近くに放射状の垂直平板と円盤とを組み合わせて旋回流発生防止用羽根を構成しているから、水面位置の汚水を吸い込むときの水面での渦や旋回流の発生を簡易に抑えることができるとともに、垂直平板と円盤とを組み合わせて構成することにより、旋回流発生防止用羽根の強度が増し、薄い板でも製作することができるとともに、放射状の垂直平板と円盤とを一体とすることができ、外形をコンパクトに成形することができる。
【０００８】
この場合において、旋回流発生防止用羽根を構成する放射状の垂直平板を、中空軸に平行な方向の長さを攪拌用羽根外径の１〜８倍、中空軸に直角な方向の長さを先端部が攪拌用羽根外径の３〜８倍の円の範囲内に設定することができる。
【０００９】
これにより、放射状に配列配置する複数枚の垂直平板の長さを、攪拌用羽根外径の１〜８倍に、また放射状の直径を、同３〜８倍とすることにより、水面位置の汚水を攪拌用羽根の回転により吸い込むとき、水面での渦や旋回流の発生をより効果的に抑えることができる。
【００１０】
また、この場合、攪拌用羽根を、１つを水面上に、１つを水中になるよう分断して配設することができる。
【００１１】
これにより、１台の攪拌機により、汚水の攪拌と曝気とを切り換えて使用することができる。
【００１２】
【発明の実施の形態】
以下、本発明の攪拌機における水面旋回流の発生防止機構の実施の形態を図面に基づいて説明する。
【００１３】
図においてＰは、下水や汚水の処理場に配設される処理槽で、この処理槽Ｐ内に攪拌機Ｓを設置して処理槽Ｐ内に流入する汚水などを攪拌、又は曝気して処理するものである。
この攪拌機Ｓは、図１に示すように、水面上に配設した電動機５により回転する中空軸１の下端に、水面下となる位置に攪拌用羽根２を取り付け、該中空軸１の外周部を筒状のカバー４にて覆うように構成している。
この攪拌用羽根２は、特に限定されるものではなく、スクリュー式、その他の形状を採用することができる。
【００１４】
また、本発明では、この攪拌機Ｓに旋回流発生防止用羽根１０を取り付ける。この旋回流発生防止用羽根１０は、図２に示すように、放射状に配設する垂直平板１１と、この放射状の垂直平板１１の上面に載置するように配設する円盤１２とより構成する。
この垂直平板１１は、攪拌用羽根上部の水面近くの筒状のカバー４の外周部に、中空軸１の中心Ｃと一致するようにして、放射状に特に限定されるものではないが、例えば４枚をほぼ等角度に配設し、筒状のカバー４と固定し、さらにこの放射状の垂直平板１１，１１の上に円盤１２を載せるようにする。そして垂直平板１１と同様に筒状のカバー４に固定するが、この場合、垂直平板１１と円盤１２との間も、互いに溶接やボルト締めで固定し、これにより一体とする。
これにより、垂直平板１１、円盤１２の単独の場合と比べて大幅に強度が増加するので、それぞれの板を薄い板で構成することができる。
【００１５】
また、放射状に配列する垂直平板１１の大きさは、図１、図２に示すように、中空軸１に平行な方向の長さＬは、攪拌用羽根２の外径ｄの１〜８倍の範囲内にて設定し、また中空軸１に直角な方向の長さＤは、先端部が攪拌用羽根２の外径ｄに対し、３〜８倍の直径Ｄの円の範囲内で設定する。このように垂直平板１１の垂直方向及び円周方向の大きさを設定することにより、攪拌用羽根２の回転により汚水の水面位置に発生する渦ｅ、旋回流ｔの発生を抑制する効果が大きい。さらに、垂直平板１１の配設数は、３枚以上が効果が大きい。
【００１６】
また、円盤１２の外径Ｄは、攪拌用羽根２の外径ｄの３〜８倍の範囲に設定するのが効果が大きい。
なお、この場合、円盤１２の外径Ｄと、放射状に配列する垂直平板１１の中空軸１に直角な方向の長さ（大きさ）とを等しくすることが望ましい。
【００１７】
このように構成する攪拌機Ｓにおいて、電動機５により中空軸１、攪拌用羽根２を回転させることにより、汚水は水面近くから吸い込まれて攪拌されつつ、攪拌用羽根２の下端より水槽底部に向かって押し出される水流ｃが発生し、処理槽Ｐ内の汚水の攪拌、又は必要に応じて曝気をも行う。
このとき、攪拌用羽根２の近傍、例えば攪拌用羽根２の上部外周位置の筒状のカバー４に、旋回流発生防止用羽根１０を配設しているため、攪拌用羽根２の回転により、汚水が水面近くから吸い込まれても、水面位置に渦ｅ、旋回流ｔの発生が抑制され、このため攪拌機Ｓの負荷が変化することなく、さらには騒音の発生も抑制して効率的な攪拌を行うものとなる。
【００１８】
また、図３に示すものは、中空軸１に曝気用羽根３と攪拌用羽根２の２つの羽根を、水面上と水中とに分断して設け、曝気と攪拌が可能な曝気攪拌機に応用した例である。この場合も、攪拌時において、攪拌専用機と同じように渦ｅや旋回流ｔの発生を抑える効果を期待することができる。
【００１９】
【発明の効果】
請求項１記載の発明によれば、攪拌用羽根の近傍に、旋回流発生防止用羽根を取り付けているので、攪拌用羽根の回転により水面位置の汚水を吸い込むときの水面での渦や旋回流の発生を抑えることができるため、攪拌機の負荷を一定にし、効率的な処理を行えるようにできるとともに、攪拌用羽根にて渦や旋回流を吸い込むこともなく、騒音の発生を抑制することができる。
そして、旋回流発生防止用羽根を、攪拌用羽根の上部外周部位置にあたる筒状のカバーの外周に、中空軸と平行で、かつ該中空軸を中心に放射状に取り付けた複数枚の垂直平板と、この放射状の垂直平板の上面で中空軸と直角となるように取り付けた円盤とより構成し、該円盤を、中空軸に対し直角で、攪拌用羽根外径の３〜８倍の範囲内で、放射状の垂直平板の外径と一致するように設定することにより、攪拌用羽根上部の水面近くに放射状の垂直平板と円盤とを組み合わせて旋回流発生防止用羽根を構成しているから、水面位置 の汚水を吸い込むときの水面での渦や旋回流の発生を簡易に抑えることができるとともに、垂直平板と円盤とを組み合わせて構成することにより、旋回流発生防止用羽根の強度が増し、薄い板でも製作することができるとともに、放射状の垂直平板と円盤とを一体とすることができ、外形をコンパクトに成形することができる。
【００２０】
また、請求項２記載の発明によれば、放射状に配列配置する複数枚の垂直平板の長さを、攪拌用羽根外径の１〜８倍に、また放射状の直径を、同３〜８倍とすることにより、水面位置の汚水を攪拌用羽根の回転により吸い込むとき、水面での渦や旋回流の発生をより効果的に抑えることができる。
【００２１】
また、請求項３記載の発明によれば、攪拌用羽根を、１つを水面上に、１つを水中になるよう分断して配設しているので、１台の攪拌機により、汚水の攪拌と曝気とを切り換えて使用することができる。
【図面の簡単な説明】
【図１】 本発明の攪拌機における水面旋回流の発生防止機構の第１実施例を示す縦断正面図である。
【図２】 旋回流発生防止用羽根を示し、（Ａ）は図１に示すＸ−Ｘ線による平面図、（Ｂ）は正面図である。
【図３】 本発明の攪拌機における水面旋回流の発生防止機構の第２実施例を示す縦断正面図である。
【図４】 従来の攪拌機を示す縦断正面図である。
【符号の説明】
１ 中空軸
２ 攪拌用羽根
３ 曝気用羽根
４ 筒状のカバー
５ 電動機
１０ 旋回流発生防止用羽根
１１ 垂直平板
１２ 円盤[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water surface swirl prevention mechanism in a stirrer, particularly a stirrer used in sewage and sewage treatment plants, or an aeration stirrer (hereinafter referred to as “stirrer” in the present specification) by driving the stirrer. In particular, the present invention relates to a mechanism for preventing the generation of a swirl flow on a water surface in a stirrer that prevents the generation of swirl and swirl of sewage.
[0002]
[Prior art]
Conventionally, in a sewage and sewage treatment plant, a stirrer S that is installed and used in a treatment tank P has a water surface at the lower end of a hollow shaft 1 that is rotated by an electric motor 5 disposed on the water surface, as shown in FIG. A stirring blade 2 is attached at a lower position, and the outer periphery of the hollow shaft 1 is covered with a cylindrical cover 4.
In this stirrer S, by rotating the hollow shaft 1 and the stirring blade 2 by the electric motor 5, the sewage is sucked from near the water surface and stirred, and the water flow pushed out from the lower end of the stirring blade 2 toward the bottom of the water tank c occurs, and the sewage in the treatment tank P is stirred or aerated as necessary.
[0003]
[Problems to be solved by the invention]
By the way, in the conventional stirrer S, when sewage near the water surface is sucked in by the stirring blade 2, the vortex e and the swirling flow t are likely to be generated from near the water surface. There has been a problem that the flow flowing into the stirring blade 2 changes, the load of the stirrer S changes, or noise is generated when a vortex is sucked into the stirring blade 2.
[0004]
An object of the present invention is to provide a water surface swirl flow preventing mechanism in a stirrer that can prevent a swirl or swirl flow from near the water surface during a stirring operation in view of the problems of the conventional stirrer. And
[0005]
[Means for Solving the Problems]
To achieve the above object, prevention mechanism of water swirling flow in the stirrer of the present invention, fitted with a stirring blade at the lower end of the water portion of the hollow shaft rotated by an electric motor which is disposed on the water surface, the blade for the stirrer In the stirrer configured to attach the swirling flow generation prevention blade near the outer periphery of the hollow shaft and cover the outer periphery of the hollow shaft with a cylindrical cover, the swirling flow generation prevention blade has a cylindrical shape corresponding to the position of the upper outer peripheral portion of the stirring blade. the outer periphery of the cover, parallel to the hollow shaft, and the hollow shaft a plurality of vertical flat plates attach radially about and attached to a hollow shaft perpendicular with the upper surface of the radial vertical flat The disc is configured so as to coincide with the outer diameter of the radial vertical flat plate within a range of 3 to 8 times the outer diameter of the stirring blade at a right angle to the hollow shaft. And
[0006]
In the stirrer of the present invention configured as described above, the water surface swirl flow preventing mechanism has a swirl flow preventing blade attached in the vicinity of the stirrer blade, so that the sewage at the water surface is sucked in by the rotation of the stirring blade. Since the generation of vortex and swirling flow on the water surface can be suppressed, the load of the stirrer can be kept constant and efficient processing can be performed, and the vortex and swirling flow are not sucked by the stirring blade The generation of noise can be suppressed.
[0007]
And a plurality of vertical flat plates in which the swirl flow preventing blade is attached to the outer periphery of the cylindrical cover corresponding to the position of the upper outer peripheral portion of the stirring blade in parallel with the hollow shaft and radially about the hollow shaft; And a disk mounted on the upper surface of the radial vertical flat plate so as to be perpendicular to the hollow shaft, the disk being perpendicular to the hollow shaft and within a range of 3 to 8 times the outer diameter of the stirring blade. By setting the radial vertical flat plate to match the outer diameter of the radial vertical plate, the radial vertical flat plate and disk are combined near the water surface above the stirring blade to form a swirl flow prevention blade. The generation of vortex and swirling flow on the water surface when sucking in sewage at a position can be easily suppressed, and the combination of a vertical plate and a disk increases the strength of the swirling flow generation prevention blade and makes it thin. Produce on board Can together, and radial vertical flat plate and the disc can be integrated, it is possible to mold the outer compact.
[0008]
In this case, the radial vertical flat plate constituting the swirl flow generation prevention blade has a length in the direction parallel to the hollow shaft of 1 to 8 times the outer diameter of the stirring blade, and a length perpendicular to the hollow shaft. The tip can be set within a circle of 3 to 8 times the outer diameter of the stirring blade.
[0009]
Accordingly, the length of the plurality of vertical flat plates arranged radially is 1 to 8 times the outer diameter of the stirring blade, and the radial diameter is 3 to 8 times the same, so that the sewage at the water surface position can be obtained. Can be more effectively suppressed from generating vortices and swirling flows on the water surface.
[0010]
Moreover, in this case, one stirring blade can be divided and disposed so that one is on the water surface and one is underwater.
[0011]
Thereby, it can switch and use agitation and aeration of sewage with one agitator.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a water surface swirl prevention mechanism in a stirrer according to the present invention will be described below with reference to the drawings.
[0013]
In the figure, P is a treatment tank disposed in a sewage or sewage treatment plant, and a stirrer S is installed in the treatment tank P to treat the sewage flowing into the treatment tank P by stirring or aeration. Is.
As shown in FIG. 1, the stirrer S has a stirring blade 2 attached to a lower end of a hollow shaft 1 rotated by an electric motor 5 disposed on the water surface at a position below the water surface, and an outer peripheral portion of the hollow shaft 1. Is covered with a cylindrical cover 4.
The stirring blade 2 is not particularly limited, and may employ a screw type or other shapes.
[0014]
Further, in the present invention, the swirl flow generation preventing blade 10 is attached to the stirrer S. As shown in FIG. 2, the swirl flow generation preventing blade 10 includes a vertical flat plate 11 arranged radially and a disk 12 arranged so as to be placed on the upper surface of the radial vertical flat plate 11. .
The vertical flat plate 11 is not particularly limited to a radial shape so as to coincide with the center C of the hollow shaft 1 on the outer peripheral portion of the cylindrical cover 4 near the water surface above the stirring blade, but for example 4 The sheets are arranged at substantially equal angles, fixed to the cylindrical cover 4, and the disk 12 is placed on the radial vertical plates 11 and 11. And it fixes to the cylindrical cover 4 similarly to the vertical flat plate 11, but in this case, the vertical flat plate 11 and the disk 12 are also fixed to each other by welding or bolting, and thereby integrated.
Thereby, since intensity | strength increases significantly compared with the case where the perpendicular | vertical flat plate 11 and the disk 12 are single, each board can be comprised with a thin board.
[0015]
Further, as shown in FIGS. 1 and 2, the size of the vertically arranged flat plates 11 is 1 to 8 times the outer diameter d of the stirring blade 2. The length D in the direction perpendicular to the hollow shaft 1 is set within the range of a circle having a diameter D of 3 to 8 times the outer diameter d of the stirring blade 2 at the tip. To do. By setting the vertical and circumferential sizes of the vertical plate 11 in this way, the effect of suppressing the generation of the vortex e and the swirling flow t generated at the water surface position of the sewage due to the rotation of the stirring blade 2 is great. . Further, the number of the arranged vertical flat plates 11 is three or more.
[0016]
It is also effective to set the outer diameter D of the disk 12 within a range of 3 to 8 times the outer diameter d of the stirring blade 2.
In this case, it is desirable to make the outer diameter D of the disk 12 equal to the length (size) in the direction perpendicular to the hollow shaft 1 of the vertically arranged flat plates 11.
[0017]
In the stirrer S configured as described above, by rotating the hollow shaft 1 and the stirring blade 2 by the electric motor 5, the sewage is sucked in from near the water surface and stirred, and from the lower end of the stirring blade 2 toward the bottom of the water tank. A water flow c to be pushed out is generated, and the sewage in the treatment tank P is agitated or aerated as necessary.
At this time, since the swirl flow prevention blade 10 is disposed in the vicinity of the stirring blade 2, for example, the cylindrical cover 4 at the upper outer peripheral position of the stirring blade 2, by the rotation of the stirring blade 2, Even if sewage is sucked from near the water surface, generation of vortex e and swirling flow t at the water surface position is suppressed, so that the load of the stirrer S does not change, and furthermore, noise generation is also suppressed and efficient stirring is performed. Will do.
[0018]
In addition, the one shown in FIG. 3 is applied to an aeration stirrer capable of aeration and agitation by providing the hollow shaft 1 with two aerating blades 3 and a stirring blade 2 on the water surface and in water. It is an example. Also in this case, it is possible to expect the effect of suppressing the generation of the vortex e and the swirling flow t at the time of stirring as in the case of the dedicated stirring machine.
[0019]
【The invention's effect】
According to the first aspect of the present invention, since the swirling flow generation preventing blade is attached in the vicinity of the stirring blade, the vortex and swirling flow on the water surface when the sewage at the water surface is sucked by the rotation of the stirring blade. The generation of noise can be suppressed, so that the load on the stirrer can be kept constant and efficient processing can be performed, and the generation of noise can be suppressed without sucking vortex or swirl flow with the stirring blade. it can.
And a plurality of vertical flat plates in which the swirl flow preventing blade is attached to the outer periphery of the cylindrical cover corresponding to the position of the upper outer peripheral portion of the stirring blade in parallel with the hollow shaft and radially about the hollow shaft; And a disk mounted on the upper surface of the radial vertical flat plate so as to be perpendicular to the hollow shaft, the disk being perpendicular to the hollow shaft and within a range of 3 to 8 times the outer diameter of the stirring blade. By setting the radial vertical flat plate to match the outer diameter of the radial vertical plate, the radial vertical flat plate and disk are combined near the water surface above the stirring blade to form a swirl flow prevention blade. The generation of vortex and swirling flow on the water surface when sucking in sewage at a position can be easily suppressed, and the combination of a vertical plate and a disk increases the strength of the swirling flow generation prevention blade and makes it thin. Produce on board Can together, and radial vertical flat plate and the disc can be integrated, it is possible to mold the outer compact.
[0020]
According to the invention of claim 2, the length of the plurality of vertical flat plates arranged radially is 1 to 8 times the outer diameter of the stirring blade, and the radial diameter is 3 to 8 times the same. Thus, when the sewage at the surface of the water is sucked in by the rotation of the stirring blade, the generation of vortices and swirling flows on the surface of the water can be more effectively suppressed.
[0021]
According to the invention described in claim 3 , since the stirring blades are arranged so that one is on the water surface and one is in the water, the sewage is stirred by one stirrer. And aeration can be switched.
[Brief description of the drawings]
FIG. 1 is a longitudinal front view showing a first embodiment of a water surface swirl prevention mechanism in a stirrer according to the present invention.
2 shows a blade for preventing swirl flow generation, (A) is a plan view taken along line XX shown in FIG. 1, and (B) is a front view.
FIG. 3 is a longitudinal front view showing a second embodiment of the water surface swirl prevention mechanism in the stirrer of the present invention.
FIG. 4 is a longitudinal front view showing a conventional stirrer.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hollow shaft 2 Agitating blade 3 Aeration blade 4 Tubular cover 5 Electric motor 10 Swirling flow preventing blade 11 Vertical flat plate 12 Disk

Claims (3)

水面上に配設された電動機により回転する中空軸の水中部の下端に攪拌用羽根を取り付け、該攪拌用羽根の近傍に旋回流発生防止用羽根を取り付け、中空軸の外周を筒状のカバーにて覆うように構成した攪拌機において、旋回流発生防止用羽根を、攪拌用羽根の上部外周部位置にあたる筒状のカバーの外周に、中空軸と平行で、かつ該中空軸を中心に放射状に取り付けた複数枚の垂直平板と、この放射状の垂直平板の上面で中空軸と直角となるように取り付けた円盤とより構成し、該円盤を、中空軸に対し直角で、攪拌用羽根外径の３〜８倍の範囲内で、放射状の垂直平板の外径と一致するように設定したことを特徴とする攪拌機における水面旋回流の発生防止機構。Attaching the lower end agitating blades of the underwater portion of the hollow shaft rotated by a disposed a motor above the water surface, near the mounting of the swirling flow prevention vanes of the stirring blade, cylindrical cover an outer periphery of the hollow shaft In the stirrer configured to cover, the swirl flow prevention blades are radially parallel to the hollow shaft on the outer periphery of the cylindrical cover corresponding to the position of the upper outer peripheral portion of the stirring blade, and radially about the hollow shaft. A plurality of attached vertical flat plates and a disc attached to the upper surface of the radial vertical flat plate so as to be perpendicular to the hollow shaft, the disc being perpendicular to the hollow shaft and having a stirring blade outer diameter. A mechanism for preventing the occurrence of a swirl flow in a water surface in a stirrer, which is set to coincide with the outer diameter of a radial vertical flat plate within a range of 3 to 8 times . 垂直平板を、中空軸に平行な方向の長さを攪拌用羽根外径の１〜８倍、中空軸に直角な方向の長さを先端部が攪拌用羽根外径の３〜８倍の円の範囲内に設定したことを特徴とする請求項１記載の攪拌機における水面旋回流の発生防止機構。 The vertical flat plate has a length in the direction parallel to the hollow shaft 1 to 8 times the outer diameter of the stirring blade, and a length in the direction perpendicular to the hollow shaft is 3 to 8 times the outer diameter of the stirring blade. The water surface swirl flow preventing mechanism in the stirrer according to claim 1, wherein the mechanism is set within the above range. 攪拌用羽根を、１つを水面上に、１つを水中になるよう分断して配設したことを特徴とする請求項１又は２記載の攪拌機における水面旋回流の発生防止機構。3. A mechanism for preventing the occurrence of a swirl flow on a water surface in a stirrer according to claim 1 , wherein one of the stirring blades is divided on the water surface and one of the blades is divided into water.
JP2002194532A 2002-07-03 2002-07-03 Mechanism to prevent generation of water surface swirl in agitator Expired - Fee Related JP4040373B2 (en)

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