JP6367752B2 - Impeller guide plate and aeration stirrer - Google Patents

Impeller guide plate and aeration stirrer Download PDF

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JP6367752B2
JP6367752B2 JP2015092182A JP2015092182A JP6367752B2 JP 6367752 B2 JP6367752 B2 JP 6367752B2 JP 2015092182 A JP2015092182 A JP 2015092182A JP 2015092182 A JP2015092182 A JP 2015092182A JP 6367752 B2 JP6367752 B2 JP 6367752B2
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impeller
guide plate
rotation
flow
aeration stirrer
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JP2015163402A (en
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鈴木　茂
鈴木　　茂
教市 真鍋
教市 真鍋
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Sumitomo Heavy Industries Environment Co 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

Description

本発明は、インペラ用ガイド板及び曝気撹拌機に関する。   The present invention relates to an impeller guide plate and an aeration stirrer.

下水の処理方法として、無終端状の循環水路が形成されたオシキデーションディッチ槽を使用する方法が知られている（特許文献１、２参照）。このオシキデーションディッチ槽における曝気撹拌機としては、縦軸型、横軸型及び斜軸型の３種類が知られている。これらのうち、横軸型の曝気撹拌機は撹拌羽根に夾雑物が絡まりやすく、斜軸型の曝気撹拌機は撹拌力が弱いためにオシキデーションディッチ槽当たりの設置台数を増やす必要がある。   As a method for treating sewage, a method is known that uses an oxidation ditch tank in which an endless circulation channel is formed (see Patent Documents 1 and 2). As the aeration stirrer in this oxidation ditch tank, there are known three types: a vertical axis type, a horizontal axis type, and an oblique axis type. Among these, the horizontal axis type aeration stirrer tends to get entangled with the stirring blades, and the inclined axis type aeration stirrer has a weak stirring power, so it is necessary to increase the number of units installed per oxidation ditch tank.

特開２００１−２５２６８１号公報JP 2001-252681 A 特開２００２−３２０９９４号公報JP 2002-320994 A

一方、縦軸型の曝気撹拌機は、処理水の水面上にインペラの一部を出した状態でインペラを回転させて表面曝気を、処理水にインペラを水没させた状態でインペラを回転させて無酸素撹拌をそれぞれ行うと共に、オシキデーションディッチ槽内全体に循環流を良好に形成させるものである。しかしながら、インペラの回転により発生する撹拌流は、インペラの下流側だけでなく上流側にも噴出するため、上流側に噴出した撹拌流が良好な循環流の形成を妨げ、下水処理性能を低下させる虞がある。特に、曝気撹拌機を循環水路の直線部分に設置する場合には、循環流に対する逆流として作用するため、その傾向が顕著となる。   On the other hand, the vertical type aeration stirrer rotates the impeller with the impeller partially protruding on the surface of the treated water, rotates the impeller, and rotates the impeller with the impeller submerged in the treated water. While performing anaerobic stirring, the circulation flow is favorably formed in the whole of the oxidation ditch tank. However, since the stirring flow generated by the rotation of the impeller is ejected not only to the downstream side but also to the upstream side of the impeller, the stirring flow jetted to the upstream side prevents the formation of a good circulation flow and reduces the sewage treatment performance. There is a fear. In particular, when an aeration stirrer is installed in a straight line portion of a circulating water channel, it acts as a reverse flow with respect to the circulating flow, and this tendency becomes remarkable.

そこで本発明は、縦軸型の曝気撹拌機を有するオシキデーションディッチ槽において、オシキデーションディッチ槽内全体に効率よく循環流を形成させることができるインペラ用ガイド板及び曝気撹拌機を提供することを目的とする。   Accordingly, the present invention provides an impeller guide plate and an aeration stirrer that can efficiently form a circulation flow in the entire occhidation ditch tank in an oxidation ditch tank having a vertical axis type aeration stirrer. Objective.

本発明は、無終端状に形成された循環水路と、循環水路における水面付近に設置され略鉛直方向の軸線回りに回転するインペラとを備えるオキシデーションディッチにおいてインペラに対して用いられるインペラ用ガイド板であって、前記循環水路の直線経路に配置されたインペラの側方に離間して配置され、前記インペラの下流側が開放されると共に、前記インペラの少なくとも上流側を側方から覆い、下流側の先端が前記インペラの回転中心よりも下流側まで延びている、インペラ用ガイド板を提供する。このようなインペラ用ガイド板（以下、単に「ガイド板」ともいう。）によれば、インペラの回転による上流側への噴出流を、ガイド板で堰き止めつつガイド板の形状に沿ってインペラの下流側へ誘導することができるため、オシキデーションディッチ槽内全体に効率よく循環流を形成させることができる。また、本発明のガイド板に、当該ガイド板の内外を連通する連通部を有してもよい。このような連通部があると、ガイド板の上流側の水面に形成されガイド板に堰き止められて当該ガイド板の外側に溜まるスカムが、連通部を通じて撹拌流による吸引が作用してガイド板の内側へ移動しガイド板に沿って下流側へ誘導されるため、ガイド板の外側にスカムが溜まることを防止することができる。   The present invention relates to a guide plate for an impeller used for an impeller in an oxidation ditch comprising a circulation water channel formed in an endless shape and an impeller that is installed near the water surface in the circulation water channel and rotates about a substantially vertical axis. The impeller disposed in a straight path of the circulation channel is spaced apart from the side, the downstream side of the impeller is opened, and at least the upstream side of the impeller is covered from the side. An impeller guide plate having a distal end extending downstream from the rotation center of the impeller is provided. According to such a guide plate for an impeller (hereinafter, also simply referred to as “guide plate”), an impeller flow along the shape of the guide plate is blocked along the shape of the guide plate while damming the jet flow upstream by the rotation of the impeller with the guide plate. Since it can be guided to the downstream side, it is possible to efficiently form a circulation flow in the entire oxidation ditch tank. Further, the guide plate of the present invention may have a communication portion that communicates the inside and outside of the guide plate. When there is such a communication portion, the scum formed on the water surface upstream of the guide plate and blocked by the guide plate and collected outside the guide plate is attracted by the stirring flow through the communication portion, and the guide plate Since it moves inward and is guided downstream along the guide plate, it is possible to prevent scum from accumulating outside the guide plate.

ここで、ガイド板の形状は、インペラの回転に沿う方向に延びるにつれて前記インペラとの離間距離が大きくなる形状とされていることが好ましい。このような形状であると、インペラの回転による上流側への噴出流を、ガイド板の形状に沿ってインペラの下流側へ容易かつ効率的に誘導することができる。   Here, it is preferable that the shape of the guide plate is such that the distance from the impeller increases as it extends in the direction along the rotation of the impeller. With such a shape, it is possible to easily and efficiently guide the jet flow to the upstream side due to the rotation of the impeller to the downstream side of the impeller along the shape of the guide plate.

また、本発明は、インペラと、上記ガイド板とを備える曝気撹拌機を提供する。このような曝気撹拌機によれば、特に、循環水路の直線部分で問題となるインペラの回転による上流側への噴出流（循環流に対する逆流）を、ガイド板で堰き止めつつガイド板の形状に沿ってインペラの下流側へ誘導することができるため、オシキデーションディッチ槽内全体に、より効率よく循環流を形成させることができる。   Moreover, this invention provides the aeration stirrer provided with an impeller and the said guide plate. According to such an aeration stirrer, in particular, the shape of the guide plate is dammed by the guide plate while blocking the upstream jet flow (reverse flow with respect to the circulation flow) due to the rotation of the impeller, which is a problem in the straight portion of the circulation channel. Since it can guide to the downstream side of the impeller along, the circulation flow can be formed more efficiently in the entire occhidation ditch tank.

なお、インペラと、上記ガイド板とを備える曝気撹拌機であって、インペラを回転させる回転軸の位置が、循環水路を横断する線分の中心位置から、インペラが平面視反時計回りに回転する場合は循環水路を区画する区画壁の側にずれた位置に存在し、インペラが平面視時計回りに回転する場合はオキシデーションディッチの周囲壁の側にずれた位置に存在する曝気撹拌機としてもよい。このような曝気撹拌機によれば、インペラの回転による撹拌流が循環水路の循環流に対して逆流となる領域が小さくなるため、オシキデーションディッチ槽内全体に、より効率よく循環流を形成させることができる。   Note that the aeration stirrer includes the impeller and the guide plate, and the position of the rotation shaft that rotates the impeller rotates counterclockwise in plan view from the center position of the line segment that crosses the circulation channel. If the impeller rotates in the clockwise direction in plan view, it exists as a stirrer that exists in a position shifted toward the peripheral wall of the oxidation ditch. Good. According to such an aeration stirrer, the region where the stirring flow due to the rotation of the impeller becomes a reverse flow with respect to the circulation flow of the circulation channel is reduced, so that the circulation flow is formed more efficiently in the entire occhidation ditch tank. be able to.

本発明によれば、縦軸型の曝気撹拌機を有するオシキデーションディッチ槽において、オシキデーションディッチ槽内全体に効率よく循環流を形成させることができるインペラ用ガイド板及び曝気撹拌機を提供することができる。   According to the present invention, in an oxidation ditch tank having a vertical axis type aeration stirrer, an impeller guide plate and an aeration stirrer that can efficiently form a circulation flow in the entire oxydation ditch tank are provided. Can do.

インペラと本実施形態のインペラ用ガイド板とを備える曝気撹拌機を循環水路の上流側から見た正面図である。It is the front view which looked at the aeration stirrer provided with the impeller and the guide plate for impellers of this embodiment from the upstream of the circulation water channel. インペラと本実施形態のインペラ用ガイド板とを備える曝気撹拌機を循環水路の直線部分に配置した場合の平面図である。It is a top view at the time of arrange | positioning the aeration stirrer provided with the impeller and the guide plate for impellers of this embodiment in the linear part of a circulating water channel. 本実施形態のインペラ用ガイド板を備えない曝気撹拌機を循環水路の直線部分に配置した場合のインペラの回転により発生する噴出流の流れを示す平面図である。It is a top view which shows the flow of the jet flow which generate | occur | produces by rotation of the impeller at the time of arrange | positioning the aeration stirrer which is not provided with the guide plate for impellers of this embodiment in the linear part of a circulation water channel. 本実施形態のインペラ用ガイド板を備える曝気撹拌機を循環水路の直線部分に配置した場合のインペラの回転により発生する噴出流の流れを示す平面図である。It is a top view which shows the flow of the jet flow which generate | occur | produces by rotation of the impeller at the time of arrange | positioning the aeration stirrer provided with the guide plate for impellers of this embodiment in the linear part of a circulating water channel. 上部に連通部を有するインペラ用ガイド板の部分斜視図である。It is a fragmentary perspective view of the guide plate for impellers which has a communication part in the upper part. インペラ用ガイド板の連通部を通じてスカムがガイド板の内側へ移動する流れを示す平面図である。It is a top view which shows the flow which a scum moves to the inner side of a guide plate through the communicating part of the guide plate for impellers.

以下、本発明の好適な実施形態について図面を参照しながら説明する。なお、図面の説明において同一要素には同一の符号を付し、重複する説明は省略する。   Preferred embodiments of the present invention will be described below with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant descriptions are omitted.

図１は、インペラ２と本実施形態のガイド板１とを備える曝気撹拌機１０を循環水路の上流側から見た正面図である。この曝気撹拌機１０は、インペラ２及びガイド板１の他に、略鉛直方向の軸線を有し下部にインペラ２が設けられた回転軸５及びインペラ２を回転駆動させるための回転駆動力を生じる電動機３と、電動機３からの回転駆動力を回転軸５に伝達し回転軸５を回転させる減速機４とを備えている。   FIG. 1 is a front view of an aeration stirrer 10 including the impeller 2 and the guide plate 1 of the present embodiment as viewed from the upstream side of the circulation channel. In addition to the impeller 2 and the guide plate 1, the aeration stirrer 10 generates a rotational driving force for rotationally driving the rotating shaft 5 and the impeller 2 having a substantially vertical axis and having the impeller 2 provided at the lower portion. An electric motor 3 and a speed reducer 4 that transmits the rotational driving force from the electric motor 3 to the rotary shaft 5 to rotate the rotary shaft 5 are provided.

図２は、インペラ２と本実施形態のガイド板１とを備える曝気撹拌機１０をオキシデーションディッチ槽３０内の循環水路の直線部分に配置した場合の平面図である。オキシデーションディッチ槽３０は、長円形に形成された周囲壁１２と、排水等の被処理水Ｗが満たされたオキシデーション槽３０内を中央で仕切る平面視直線状の区画壁１４とを有し、無終端状の循環水路を形成したものである。   FIG. 2 is a plan view when the aeration stirrer 10 including the impeller 2 and the guide plate 1 of the present embodiment is arranged in a straight line portion of the circulation channel in the oxidation ditch tank 30. The oxidation ditch tank 30 has a peripheral wall 12 formed in an oval shape and a partition wall 14 having a linear shape in plan view that partitions the inside of the oxidation tank 30 filled with water to be treated W such as waste water. An endless circulation channel is formed.

図２では、インペラ２が循環水路の直線部分に配置されると共に区画壁１４側に配置される態様を示した。ここで、インペラ２は、排水等の被処理水Ｗの水面付近に浸漬されて回転することで被処理水Ｗを撹拌及び曝気する。この撹拌は同時に、オシキデーションディッチ槽３０内全体に循環流を形成する。そして、インペラ２は反時計回りに回転し、矢印で示した方向に循環流を形成する。   FIG. 2 shows a mode in which the impeller 2 is disposed on the straight wall portion of the circulation channel and on the partition wall 14 side. Here, the impeller 2 stirs and aerates the treated water W by being immersed in the vicinity of the surface of the treated water W such as waste water and rotating. At the same time, this agitation forms a circulating flow in the entire oxidization ditch tank 30. The impeller 2 rotates counterclockwise and forms a circulating flow in the direction indicated by the arrow.

また、曝気撹拌機１０は、インペラ２を反時計回りに回転させる回転軸の位置が、循環水路を横断する線分の中心位置から循環水路を区画する区画壁１４の側にずれた位置に存在する。言い換えると、循環流の流れる方向に対して、インペラ２の回転方向が逆向きとなる側が、区画壁１４側に近づいた状態となるように曝気撹拌機１０が配置される。   Moreover, the aeration stirrer 10 exists in the position where the position of the rotating shaft that rotates the impeller 2 counterclockwise is shifted from the center position of the line segment that crosses the circulating water channel toward the partition wall 14 that partitions the circulating water channel. To do. In other words, the aeration stirrer 10 is arranged so that the side in which the rotation direction of the impeller 2 is opposite to the direction in which the circulating flow flows is close to the partition wall 14 side.

そして、このオシキデーションディッチ槽３０にあっては、所定時間撹拌曝気することでオキシデーションディッチ槽３０全体を好気性領域とし、その後所定時間インペラ２を低速回転させ撹拌のみを行うことでオキシデーションディッチ槽３０全体を嫌気性領域とする。なお、インペラ２として、特開平１１−２９０８８５号公報又は特開２０１０−２０３３５１号公報に開示されている昇降可能なものを用いて、所定時間撹拌曝気することで槽全体を好気性領域とし、その後所定時間インペラ２を被処理水Ｗ内に浸漬して撹拌のみを行うことで槽全体を嫌気性領域とするオキシデーションディッチとすることもできる。更に、インペラ２の下流側の所定領域を好気性とし、そこからインペラ２の上流側までを嫌気性とするオキシデーションディッチとすることもできる。   In the oxidation ditch tank 30, the entire oxidation ditch tank 30 is set to an aerobic region by agitating and agitating for a predetermined time, and then the impeller 2 is rotated at a low speed for a predetermined time to perform only the agitation. The entire tank 30 is an anaerobic region. In addition, as the impeller 2, the entire tank is made an aerobic region by agitating and agitating for a predetermined time using a thing that can be moved up and down disclosed in JP-A-11-290885 or JP-A-2010-203351 It can also be set as the oxidation ditch which makes the whole tank the anaerobic area | region by immersing the impeller 2 in the to-be-processed water W for predetermined time, and only stirring. Furthermore, an oxidation ditch in which a predetermined region on the downstream side of the impeller 2 is aerobic and an anaerobic region from there to the upstream side of the impeller 2 can also be provided.

曝気撹拌機１０において、ガイド板１は、図１及び図２に示すように、インペラ２の側方に離間して配置され、例えばボルト締め等により区画壁１４に固定される。ここで、ガイド板１は、インペラ２の下流側が開放されると共に、インペラ２の少なくとも上流側を側方から覆うように配置され、その形状は、インペラ２の回転による上流側への噴出流をインペラ２の下流側へ誘導する形状とされている。具体的には、ガイド板１の形状は、インペラ２の回転に沿う方向（図２及び図４の反時計回り方向）に延びるにつれてインペラ２との離間距離が大きくなる形状とされている。また、ガイド板１の形状は、インペラ２の回転に沿う方向に対して曲線からなり、インペラ２の回転に沿う方向に延びるにつれて曲率が連続的に徐々に小さくなる形状とされている。   In the aeration stirrer 10, the guide plate 1 is disposed apart from the side of the impeller 2 as shown in FIGS. 1 and 2, and is fixed to the partition wall 14 by bolting or the like, for example. Here, the guide plate 1 is arranged so that the downstream side of the impeller 2 is opened and at least the upstream side of the impeller 2 is covered from the side, and the shape of the guide plate 1 is that the jet flow to the upstream side due to the rotation of the impeller 2. The shape is such that it is guided downstream of the impeller 2. Specifically, the shape of the guide plate 1 is such that the distance from the impeller 2 increases as it extends in the direction along the rotation of the impeller 2 (counterclockwise direction in FIGS. 2 and 4). The shape of the guide plate 1 is a curve with respect to the direction along the rotation of the impeller 2, and the curvature continuously decreases gradually as it extends in the direction along the rotation of the impeller 2.

ガイド板１の高さ方向の位置は、インペラ２の高さと概ね一致し、その高さ方向の長さは、インペラ２の回転により上流側へ向かって発生する噴出流を堰き止めるために十分な程度の長さを有するものとする。従って、当該噴出流が及ばない水深部、すなわちガイド板１の鉛直方向下側は、循環流が通過する領域となる。   The position in the height direction of the guide plate 1 substantially coincides with the height of the impeller 2, and the length in the height direction is sufficient to block the jet flow generated toward the upstream side by the rotation of the impeller 2. It shall have a length of about. Accordingly, the depth of water where the jet flow does not reach, that is, the lower side in the vertical direction of the guide plate 1 is a region through which the circulating flow passes.

ガイド板１の材質としては、被処理水Ｗに長期間浸漬しても腐食せず、かつ、循環流やインペラ２の撹拌流に耐える剛性を有するものであれば特に制限なく採用することができ、例えばステンレススチールやプラスチック等を採用することができる。また、ガイド板１の表面が防腐処理されていることが特に好ましい。   Any material can be used for the guide plate 1 as long as it does not corrode even if it is immersed in the water W to be treated for a long period of time and is rigid enough to withstand the circulating flow or the stirring flow of the impeller 2. For example, stainless steel or plastic can be used. Moreover, it is especially preferable that the surface of the guide plate 1 is subjected to antiseptic treatment.

図３は、本実施形態のガイド板１を備えない曝気撹拌機を循環水路の直線部分に配置した場合のインペラ２の回転により発生する噴出流の流れを示す平面図である。曝気撹拌機が本実施形態のガイド板１を備えない場合、図３中の矢印で示したように、反時計回りに回転するインペラ２の回転により発生する噴出流は、インペラ２の下流側だけでなく、循環流の逆流となる上流側及び周囲壁１２側にも噴出するため、上流側及び周囲壁１２側に噴出した撹拌流が良好な循環流の形成を妨げ、下水処理性能を低下させる虞がある。   FIG. 3 is a plan view showing the flow of the jet flow generated by the rotation of the impeller 2 when an aeration stirrer that does not include the guide plate 1 of the present embodiment is arranged in a straight line portion of the circulation water channel. When the aeration stirrer does not include the guide plate 1 of the present embodiment, as shown by the arrow in FIG. 3, the jet flow generated by the rotation of the impeller 2 that rotates counterclockwise is only on the downstream side of the impeller 2. In addition, since it is also ejected to the upstream side and the peripheral wall 12 side, which is a reverse flow of the circulating flow, the stirring flow ejected to the upstream side and the peripheral wall 12 side prevents the formation of a good circulating flow and reduces the sewage treatment performance. There is a fear.

図４は、本実施形態のインペラ用ガイド板１を備える曝気撹拌機１０を循環水路の直線部分に配置した場合のインペラ２の回転により発生する噴出流の流れを示す平面図である。曝気撹拌機が本実施形態のガイド板１を備える場合、図４中の矢印で示したように、図３において上流側及び周囲壁１２側へ噴出していた噴出流が、ガイド板１で堰き止められつつ、ガイド板１の形状に沿ってインペラ２の下流側へ誘導される。このため、曝気撹拌機１０の周辺部においては、インペラ２による水流はガイド板１に従い下流側へ向かい、オシキデーションディッチ槽３０内全体に効率よく循環流が形成される。   FIG. 4 is a plan view showing the flow of the jet flow generated by the rotation of the impeller 2 when the aeration stirrer 10 including the impeller guide plate 1 of the present embodiment is arranged in a straight line portion of the circulation channel. When the aeration stirrer includes the guide plate 1 of this embodiment, as shown by the arrows in FIG. 4, the jet flow that has been jetted to the upstream side and the peripheral wall 12 side in FIG. While being stopped, the guide plate 1 is guided to the downstream side of the impeller 2 along the shape of the guide plate 1. For this reason, in the peripheral part of the aeration stirrer 10, the water flow by the impeller 2 moves downstream according to the guide plate 1, so that a circulation flow is efficiently formed in the entire oxydation ditch tank 30.

また、ここでは、ガイド板１の形状がインペラ２の回転に沿う方向に延びるにつれてインペラ２との離間距離が大きくなる形状とされているため、インペラ２の回転による上流側及び周囲壁１２側への噴出流を、ガイド板１の形状に沿ってインペラ２の下流側へ容易かつ効率的に誘導することができる。また、ガイド板１の形状がインペラ２の回転に沿う方向に対して曲線からなりインペラ２の回転に沿う方向に延びるにつれて曲率が連続的に小さくなる形状とされているため、上記効果が一層容易に得られる。なお、ガイド板１は、例えば曲率半径の異なる弧を組み合わせた場合のように、インペラ２の回転に沿う方向に延びるにつれて曲率が段階的に小さくなる形状とされていてもよく、直線部分を含んだ形状とされていてもよい。   Here, the guide plate 1 has a shape in which the separation distance from the impeller 2 increases as the shape of the guide plate 1 extends in the direction along the rotation of the impeller 2, so the upstream side and the peripheral wall 12 side due to the rotation of the impeller 2. Can be easily and efficiently guided to the downstream side of the impeller 2 along the shape of the guide plate 1. Further, since the shape of the guide plate 1 is a curve with respect to the direction along the rotation of the impeller 2 and the curvature continuously decreases as it extends in the direction along the rotation of the impeller 2, the above effect can be further facilitated. Is obtained. The guide plate 1 may have a shape in which the curvature gradually decreases as it extends in the direction along the rotation of the impeller 2, as in the case of combining arcs having different curvature radii, for example, and includes a straight portion. It may be a shape.

また、ここでは、インペラ２が、循環水路の直線部分に配置され、循環水路の直線部分で問題となるインペラ２の回転による上流側への噴出流を、ガイド板１で堰き止めつつガイド板１の形状に沿ってインペラ２の下流側へ誘導することができるため、オシキデーションディッチ槽３０内全体に、より効率よく循環流を形成させることができる。   Here, the impeller 2 is arranged in a straight line portion of the circulating water channel, and the guide plate 1 dams up the jet flow upstream due to the rotation of the impeller 2 which is a problem in the straight line portion of the circulating water channel. Therefore, the circulation flow can be more efficiently formed in the entire occhidation ditch tank 30.

さらにまた、インペラ２を反時計回りに回転させる回転軸５の位置が、循環水路を横断する線分の中心位置から循環水路を区画する区画壁１４の側にずれた位置に存在しているため、インペラ２の回転による撹拌流が循環水路の循環流に対して逆流となる領域が小さくなり、オシキデーションディッチ槽３０内全体に、より効率よく循環流を形成させることができる。なお、本実施形態では曝気撹拌機１０が区画壁１４側に配置された例を示しているが、インペラ２の回転方向を時計回りとし、曝気撹拌機１０を周囲壁１２側に配置した態様とすることもできる。   Furthermore, the position of the rotating shaft 5 that rotates the impeller 2 counterclockwise exists at a position shifted from the center position of the line segment that crosses the circulating water channel toward the partition wall 14 that partitions the circulating water channel. The region in which the stirring flow due to the rotation of the impeller 2 becomes a reverse flow with respect to the circulation flow in the circulation channel is reduced, and the circulation flow can be formed more efficiently in the entire oxidization ditch tank 30. In this embodiment, an example in which the aeration stirrer 10 is arranged on the partition wall 14 side is shown. However, the rotation direction of the impeller 2 is clockwise and the aeration stirrer 10 is arranged on the peripheral wall 12 side. You can also

本発明のガイド板は、他の実施形態において、その上部に当該ガイド板の内外を連通する連通部１５を有する。図５は、上部に連通部１５を有するガイド板１１の部分斜視図であり、図６は、ガイド板１１の連通部１５を通じてスカムがガイド板１１の内側（下流側）へ移動する流れを示す平面図である。連通部１５は、内外で連通すると共に上方に開放されたスリット１５ａと、このスリット１５ａに後述のスカムを案内すべくスリット１５ａを外側から覆うように設けられた案内部１５ｂとを有し、図５中の矢印で示したように、ガイド板１１の上流側の水面に形成されガイド板１１に堰き止められて当該ガイド板１１の外側に溜まるスカム（図示せず）を、被処理水Ｗとともにガイド板１１の外から内へ移動させる連絡通路として機能する。そして、当該連通部１５を通じてインペラ２の撹拌流による吸引が作用して、図６中の矢印で示したように、スカム及び被処理水Ｗがガイド板１１の外側から内側へ移動し、ガイド板１１に沿って下流側へ誘導され、これによりガイド板１１の外側にスカムが溜まることが防止される。   In another embodiment, the guide plate of the present invention has a communication portion 15 that communicates the inside and outside of the guide plate at the top thereof. FIG. 5 is a partial perspective view of the guide plate 11 having the communication portion 15 in the upper portion, and FIG. 6 shows a flow in which the scum moves to the inside (downstream side) of the guide plate 11 through the communication portion 15 of the guide plate 11. It is a top view. The communication portion 15 includes a slit 15a that communicates inside and outside and is open upward, and a guide portion 15b that is provided so as to cover the slit 15a from the outside so as to guide a scum described later to the slit 15a. 5, a scum (not shown) that is formed on the upstream water surface of the guide plate 11 and is blocked by the guide plate 11 and collects outside the guide plate 11 together with the treated water W. It functions as a communication passage that moves from the outside to the inside of the guide plate 11. Then, suction by the stirring flow of the impeller 2 acts through the communication portion 15, and the scum and the water to be treated W move from the outside to the inside of the guide plate 11 as shown by the arrows in FIG. 11, the scum is prevented from accumulating outside the guide plate 11.

なお、オキシデーションディッチ槽は、循環水路の折り返し部分（コーナー部分）の水流を整流するために、当該折り返し部分に、折り返し部分の形状に沿って底壁から上方に延びる隔壁が設けられる場合があり、この場合には折り返し部分に曝気撹拌機を配置できず、本実施形態のように循環水路の直線部分に曝気撹拌機を配置することになるため、本実施形態の適用が特に有効である。   The oxidation ditch tank may be provided with a partition wall extending upward from the bottom wall along the shape of the folded portion in order to rectify the water flow in the folded portion (corner portion) of the circulating water channel. In this case, the aeration stirrer cannot be disposed in the folded portion, and the aeration stirrer is disposed in the straight line portion of the circulating water channel as in the present embodiment. Therefore, the application of the present embodiment is particularly effective.

以上、本発明の好適な実施形態について説明したが、本発明は上記実施形態に何ら限定されるものではない。例えば、オキシデーションディッチ槽の循環水路は無終端状に形成されたものであれば特に限定されず、長円形の他に、例えば馬蹄形とすることもできる。また、上記実施形態ではオキシデーションディッチ槽当たりの曝気撹拌機の設置台数を１台としているが、これを複数台とすることもできる。さらに、ガイド板の上部に設けられた連通部の形状は、スカムを案内できる形状であれば特に限定されず、例えば貫通孔であってもよい。   The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, the circulation channel of the oxidation ditch tank is not particularly limited as long as it is formed in an endless shape, and may be, for example, a horseshoe shape in addition to an oval shape. Moreover, although the installation number of the aeration stirrer per oxidation ditch tank is set to 1 in the said embodiment, this can also be made into multiple units. Furthermore, the shape of the communication part provided in the upper part of a guide plate will not be specifically limited if it is a shape which can guide a scum, For example, a through-hole may be sufficient.

１，１１…インペラ用ガイド板、２…インペラ、３…電動機、４…減速機、５…回転軸、１０…曝気撹拌機、１２…周囲壁、１４…区画壁、１５…連通部、１５ａ…スリット、１５ｂ…案内部、３０…オキシデーションディッチ槽、Ｗ…被処理水。 DESCRIPTION OF SYMBOLS 1,11 ... Impeller guide plate, 2 ... Impeller, 3 ... Electric motor, 4 ... Reduction gear, 5 ... Rotating shaft, 10 ... Aeration stirrer, 12 ... Peripheral wall, 14 ... Partition wall, 15 ... Communication part, 15a ... Slit, 15b ... guide part, 30 ... oxidation ditch tank, W ... treated water.

Claims (3)

無終端状に形成された循環水路と、前記循環水路における水面付近に設置され略鉛直方向の軸線回りに回転するインペラとを備えるオキシデーションディッチにおいて前記インペラに対して用いられるインペラ用ガイド板であって、
前記循環水路の直線経路に配置されたインペラの側方に離間して配置され、前記インペラの下流側が開放されると共に、前記インペラの少なくとも上流側を側方から覆い、下流側の先端が前記インペラの回転中心よりも下流側まで延びており、
前記インペラの回転に沿う方向に延びるにつれて前記インペラとの離間距離が連続的に大きくなる形状とされており、
高さ方向の位置は、インペラの高さと概ね一致し、前記高さ方向の長さは、インペラの回転により上流側へ向かって発生する噴出流を堰き止めるために十分な程度の長さを有し、前記噴出流が及ばない水深部であるガイド板の鉛直方向下側は、循環流が通過する領域となる、
インペラ用ガイド板。 An impeller guide plate used for the impeller in an oxidation ditch comprising a circulation water channel formed in an endless shape and an impeller installed near the water surface in the circulation water channel and rotating around a substantially vertical axis. And
The impeller disposed on the side of the straight path of the circulating water channel is spaced apart, the downstream side of the impeller is opened, at least the upstream side of the impeller is covered from the side, and the tip on the downstream side is the impeller Extends to the downstream side of the center of rotation,
Distance between the impeller as it extends in a direction along the rotation of the impeller are a continuously larger shape,
The position in the height direction substantially coincides with the height of the impeller, and the length in the height direction has a length sufficient to block the jet flow generated toward the upstream side by the rotation of the impeller. And, the vertical direction lower side of the guide plate which is the depth part where the jet flow does not reach is a region through which the circulating flow passes,
Guide plate for impeller . 前記インペラの回転に沿う方向に延びるにつれて、当該インペラ用ガイド板の一端から他端に亘って、前記インペラとの離間距離が連続的に大きくなる形状とされている、請求項１に記載のインペラ用ガイド板。   The impeller according to claim 1, wherein a distance from the impeller is continuously increased from one end to the other end of the impeller guide plate as it extends in a direction along the rotation of the impeller. Guide plate. インペラと、請求項１又は２に記載のインペラ用ガイド板とを備える曝気撹拌機。   An aeration stirrer comprising an impeller and the impeller guide plate according to claim 1.
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US5041217A (en) * 1977-11-04 1991-08-20 Reid John H Apparatus for maximizing biological use of entire volume of endless channel in an oxidation ditch
US4278547A (en) * 1977-11-04 1981-07-14 Reid John H Conservation of momentum in a barrier oxidation ditch
US4532038A (en) * 1979-04-04 1985-07-30 Reid John H Flow control apparatus for aerobic sewage treatment
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US5084167A (en) * 1989-10-23 1992-01-28 Beard Harold J Oxidation ditch for treatment of waste water
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