JP3188141B2 - Screw type aerator - Google Patents
Screw type aeratorInfo
- Publication number
- JP3188141B2 JP3188141B2 JP14538295A JP14538295A JP3188141B2 JP 3188141 B2 JP3188141 B2 JP 3188141B2 JP 14538295 A JP14538295 A JP 14538295A JP 14538295 A JP14538295 A JP 14538295A JP 3188141 B2 JP3188141 B2 JP 3188141B2
- Authority
- JP
- Japan
- Prior art keywords
- hollow shaft
- blade
- screw
- angle
- type aerator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
【０００１】[0001]
【産業上の利用分野】本発明は、汚水を撹拌して負圧を
発生させることにより汚水中に空気（酸素）を供給し、
曝気を行うスクリュー型曝気機に関し、さらに詳しく
は、駆動モータにより回転し、軸端に開口部を形成した
中空軸の先端部に１枚又は複数枚の螺旋状に形成した板
状の羽根を設けたスクリュー型曝気機に関するものであ
る。BACKGROUND OF THE INVENTION The present invention relates to a method for supplying air (oxygen) to sewage by stirring the sewage to generate a negative pressure.
More specifically, a screw-type aerator that performs aeration is provided with one or more spiral plate-like blades at the tip of a hollow shaft that is rotated by a drive motor and has an opening at the shaft end. And a screw type aerator.
【０００２】[0002]
【従来の技術】駆動モータにより回転し、軸端に開口部
を形成した中空軸の先端部に螺旋状に形成した羽根を設
けたスクリュー型曝気機として、例えば、特公昭５６ー
２１４５２号公報に記載されたものが知られている。2. Description of the Related Art A screw type aerator provided with a spirally formed blade at a tip end of a hollow shaft having an opening at the shaft end, which is rotated by a drive motor, is disclosed in, for example, Japanese Patent Publication No. 56-21452. The ones described are known.
【０００３】このスクリュー型曝気機の場合、図１０及
び図１１（ａ）〜（ｅ）に示すように、羽根のピッチＰ
をスクリュー出口部ほど小さく（羽根の外縁と中空軸の
円周方向のなす角度（β）をスクリュー出口部ほど小さ
く）するようにしている。In the case of this screw type aerator, as shown in FIGS. 10 and 11 (a) to 11 (e), the pitch P
(The angle (β) between the outer edge of the blade and the circumferential direction of the hollow shaft is smaller at the screw outlet).
【０００４】ところで、羽根の外縁と中空軸の円周方向
のなす角度（β）をスクリュー出口部ほど小さくする
と、図５（ａ）に示すようにスクリュー出口部での水流
の絶対速度（Ｖ）が上がらず、大きな負圧を発生させる
ことができない。このため、中空軸を通って汚水中に供
給される空気量が少ないものとなる。また、スクリュー
出口部での水流の絶対速度（Ｖ）が上がらないため、汚
水の撹拌力が小さく、酸素が溶存した水を曝気槽の深く
かつ遠くまで送り込むことができない。When the angle (β) between the outer edge of the blade and the circumferential direction of the hollow shaft is smaller at the screw outlet, the absolute velocity (V) of the water flow at the screw outlet is reduced as shown in FIG. And a large negative pressure cannot be generated. Therefore, the amount of air supplied into the wastewater through the hollow shaft is small. In addition, since the absolute velocity (V) of the water flow at the screw outlet does not increase, the stirring power of the sewage is small, and the water in which oxygen is dissolved cannot be sent deep and far into the aeration tank.
【０００５】また、スクリュー出口部での水流の絶対速
度（Ｖ）を大きくするためには、羽根の外縁と中空軸の
円周方向のなす角度（β）を大きくする必要があるが、
この場合、従来のスクリュー型曝気機においては、スク
リュー入口部での羽根の外縁と中空軸の円周方向のなす
角度（β）が必然的に大きなものとなる。ところで、ス
クリュー入口部での流れには旋回成分がないため、スク
リュー入口部での羽根の外縁と中空軸の円周方向のなす
角度（β）が大きくなるとスクリュー入口部での流体損
失が大きくなるという問題点を有していた。In order to increase the absolute velocity (V) of the water flow at the screw outlet, it is necessary to increase the angle (β) between the outer edge of the blade and the circumferential direction of the hollow shaft.
In this case, in the conventional screw type aerator, the angle (β) between the outer edge of the blade and the circumferential direction of the hollow shaft at the screw inlet becomes inevitably large. By the way, since there is no swirl component in the flow at the screw inlet, if the angle (β) between the outer edge of the blade at the screw inlet and the circumferential direction of the hollow shaft increases, the fluid loss at the screw inlet increases. There was a problem that.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、上記従来の
スクリュー型曝気機の有する問題点を解決し、曝気性能
が高いスクリュー型曝気機を提供することを目的とす
る。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the conventional screw type aerator and to provide a screw type aerator having high aeration performance.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するた
め、本発明は、駆動モータにより回転し、軸端に開口部
を形成した中空軸の先端部に１枚又は複数枚の螺旋状に
形成した板状の羽根を設けたスクリュー型曝気機におい
て、羽根と中空軸との接合部の長さを羽根の最大高さ
（ｈmax）の２．５倍以上で、中空軸に対する羽根の巻
き角度（θ）を３６０度／羽根の枚数以上とし、スクリ
ュー出口部における羽根の外縁と中空軸の円周方向のな
す角度（β）を３０度〜１００度の範囲に設定し、中空
軸の外径（ｄ）と羽根の最大外径（Ｄmax）との比（ｄ
／Ｄmax）を０．２０〜０．５５の範囲に設定するとと
もに、中空軸と直交する断面における羽根の外縁の中空
軸の回転する方向への曲げ角度（γ）を羽根の最大外径
（Ｄmax）の位置において１０度〜２２度の範囲に設定
したことを要旨とする。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides one or more spirals formed at the tip of a hollow shaft which is rotated by a drive motor and has an opening at the shaft end. In the screw type aerator provided with the plate-shaped blades, the length of the joint between the blades and the hollow shaft is set to 2.5 times or more the maximum height (hmax) of the blades, and the winding angle ( θ) is 360 degrees / number of blades or more, and the angle (β) between the outer edge of the blades and the circumferential direction of the hollow shaft at the screw outlet is set in the range of 30 ° to 100 °, and the outer diameter of the hollow shaft ( d) and the maximum outer diameter (Dmax) of the blade (dmax)
/ Dmax) is set in the range of 0.20 to 0.55, and the bending angle (γ) of the outer edge of the blade in the section orthogonal to the hollow shaft in the rotating direction of the hollow shaft is determined by the maximum outer diameter (Dmax) of the blade. The point is that the angle is set in the range of 10 to 22 degrees.
【０００８】[0008]
【作用】本発明のスクリュー型曝気機によれば、スクリ
ュー出口部での水流の絶対速度を高め、大きな負圧を発
生させて、中空軸を通って汚水中に大量の空気を供給す
ることができる。また、スクリュー出口部での水流の絶
対速度が高められるため、汚水の撹拌力が大きく、酸素
が溶存した水を曝気槽の深くかつ遠くまで送り込むこと
ができる。According to the screw type aerator of the present invention, it is possible to increase the absolute velocity of the water flow at the screw outlet, generate a large negative pressure, and supply a large amount of air into the wastewater through the hollow shaft. it can. Further, since the absolute velocity of the water flow at the screw outlet is increased, the stirring power of the sewage is large, and the water in which oxygen is dissolved can be sent deep and far into the aeration tank.
【０００９】[0009]
【実施例】以下、本発明のスクリュー型曝気機を図示の
実施例に基づいて説明する。図１〜図４に本発明のスク
リュー型曝気機の第１実施例を示す。このスクリュー型
曝気機１は、下水処理場の曝気槽等に配設されるもの
で、駆動モータ２により回転し、軸端に開口部３ｂを形
成した中空軸３の先端部に１枚又は複数枚の螺旋状に形
成した板状の羽根４を設けてスクリュー５を構成する。
中空軸３の基端部には吸気孔３ａを穿設し、駆動モータ
２により中空軸３を介して汚水中でスクリュー５を回転
してスクリュー５の前方領域の汚水中に負圧を発生させ
ることにより、吸気孔３ａから空気を吸引し、吸引した
空気を中空軸３の軸端に形成した開口部３ｂから汚水中
に供給するようにする。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a screw type aerator according to the present invention. 1 to 4 show a first embodiment of a screw type aerator according to the present invention. The screw type aerator 1 is disposed in an aeration tank or the like of a sewage treatment plant, and is rotated by a drive motor 2 and has one or a plurality of hollow shafts 3 at a tip end of a hollow shaft 3 having an opening 3b at a shaft end. A screw 5 is formed by providing a plurality of spiral plate-like blades 4.
An intake hole 3a is formed at the base end of the hollow shaft 3, and the screw 5 is rotated in the sewage through the hollow shaft 3 by the drive motor 2 to generate a negative pressure in the sewage in the area in front of the screw 5. In this way, air is sucked from the intake hole 3a, and the sucked air is supplied to the sewage from the opening 3b formed at the shaft end of the hollow shaft 3.
【００１０】スクリュー５は、プレス等により曲げ加工
したそれぞれ独立した３枚の板状の羽根４を略等間隔に
互いに接することなく中空軸３に螺旋状に溶接すること
により構成する。この場合、スクリューの羽根の枚数は
３枚に限定されず、１枚又は２枚若しくはそれ以上の複
数枚とすることができ、また、羽根と中空軸との固着方
法も、溶接に限定されず、任意の機械的な固着方法を採
用することができる。The screw 5 is formed by spirally welding three independent plate-like blades 4 bent by a press or the like to the hollow shaft 3 at substantially equal intervals without contacting each other. In this case, the number of blades of the screw is not limited to three, but may be one, two or more, and the method of fixing the blades to the hollow shaft is not limited to welding. Any mechanical fastening method may be employed.
【００１１】この場合において、所定の曝気性能を得る
ため、羽根４の中空軸３との接合部４１の長さ（羽根４
の基端部４ａから先端部４ｂまでの接合部の全長）を羽
根４の最大高さ（ｈmax）の２．５倍以上とするととも
に、中空軸３に対する羽根４の巻き角度（θ）を３６０
度／羽根の枚数以上（本実施例においては、３６０度／
３枚＝１２０度以上の３００度）とする。また、中空軸
３の外径（ｄ）と羽根４の最大外径（Ｄmax）との比
（ｄ／Ｄmax）を、この比（ｄ／Ｄmax）と曝気性能との
関係を示した図６からも明らかなように、０．２０〜
０．５５の範囲（本実施例においては０．４４）に設定
し（（ｄ／Ｄmax）が０．２０より小さいと供給される
空気量が少なくなり、また、０．５５より大きいと供給
される水量が少なくなり、いずれの場合も曝気性能が低
下する。なお、この図において、曝気性能が０．８より
小さな値になると通常の曝気機としては使用できない状
態を示す。）、さらに、スクリュー５の強度を高めるた
め、好ましくは、羽根４の先端部４ｂの中空軸３の軸端
に形成した開口部３ｂからの突出量（ｔ）を羽根４の最
大高さ（ｈmax）の０．５倍以下とする。In this case, in order to obtain a predetermined aeration performance, the length of the joint portion 41 of the blade 4 with the hollow shaft 3 (the blade 4
Is set to be 2.5 times or more the maximum height (hmax) of the blade 4 and the winding angle (θ) of the blade 4 with respect to the hollow shaft 3 is set to 360.
Degrees / number of blades (in this embodiment, 360 degrees /
3 = 120 degrees or more and 300 degrees). The ratio (d / Dmax) between the outer diameter (d) of the hollow shaft 3 and the maximum outer diameter (Dmax) of the blade 4 is shown in FIG. 6 showing the relationship between the ratio (d / Dmax) and the aeration performance. As is clear,
It is set in the range of 0.55 (0.44 in this embodiment) (if (d / Dmax) is smaller than 0.20, the amount of supplied air is reduced. In this case, if the aeration performance is less than 0.8, the aeration performance is in a state where it cannot be used as a normal aerator.) In order to increase the strength of the blade 5, preferably, the amount of protrusion (t) of the tip 4b of the blade 4 from the opening 3b formed at the shaft end of the hollow shaft 3 is set to 0.5 of the maximum height (hmax) of the blade 4. Double or less.
【００１２】また、スクリュー出口部５ｂにおける羽根
４の外縁４２と中空軸３の円周方向のなす角度（β）
（以下、角度（β）という。）は、角度（β）と曝気性
能との関係を示した図７からも明らかなように、３０度
〜１００度の範囲に設定する必要がある。すなわち、角
度（β）を３０度以上に設定することにより、スクリュ
ー出口部５ｂでの水流の絶対速度（Ｖ）が大きくなる。
このように、水流の絶対速度（Ｖ）が大きいと、スクリ
ューから出た水流の勢いが強いため、スクリュー５の中
空軸３の軸端に形成した開口部３ｂから汚水中に送り込
まれた空気の気泡を深く、かつ遠くまで送り込むことが
できる。また、水流の絶対速度（Ｖ）が大きいと、スク
リュー５の中空軸３の軸端に形成した開口部３ｂに大き
な負圧を発生させることができ、汚水中に大量の空気を
送り込むことができる。これらのことから、水中に溶け
る酸素の量も多くなり、曝気性能を向上することができ
る。一方、角度（β）を１００度より大きく設定する
と、水流の旋回速度のみが大きくなり過ぎ、スクリュー
５の回転駆動力が大きくなる割には、空気の供給量が増
加せず、曝気性能が低下することとなる。なお、この図
において、曝気性能が０．８より小さな値になると通常
の曝気機としては使用できない状態を示す。羽根４と中
空軸３との接合部４１と中空軸３の円周方向のなす角度
（α）（以下、角度（α）という。）は、スクリュー出
口部５ｂでの水流の絶対速度を高めるため、スクリュー
出口部５ｂにおいて拡大するように構成することが望ま
しい。The angle (β) between the outer edge 42 of the blade 4 and the hollow shaft 3 in the circumferential direction at the screw outlet 5b.
(Hereinafter, the angle (β) will need to be set in the range of 30 ° to 100 °, as is clear from FIG. 7 showing the relationship between the angle (β) and the aeration performance. That is, by setting the angle (β) to 30 degrees or more, the absolute velocity (V) of the water flow at the screw outlet 5b increases.
As described above, when the absolute velocity (V) of the water flow is large, the force of the water flow coming out of the screw is strong, so that the air fed into the sewage from the opening 3 b formed at the shaft end of the hollow shaft 3 of the screw 5 is removed. Bubbles can be sent deep and far. When the absolute velocity (V) of the water flow is high, a large negative pressure can be generated in the opening 3b formed at the shaft end of the hollow shaft 3 of the screw 5, and a large amount of air can be sent into the wastewater. . From these facts, the amount of oxygen dissolved in water increases, and the aeration performance can be improved. On the other hand, when the angle (β) is set to be larger than 100 degrees, only the swirling speed of the water flow becomes too high, and although the rotational driving force of the screw 5 increases, the air supply amount does not increase and the aeration performance decreases. Will be done. In this figure, when the aeration performance becomes a value smaller than 0.8, the state cannot be used as a normal aerator. An angle (α) (hereinafter referred to as an angle (α)) formed between the joint portion 41 between the blade 4 and the hollow shaft 3 and the hollow shaft 3 in the circumferential direction is to increase the absolute velocity of the water flow at the screw outlet 5b. It is desirable that the screw outlet 5b be configured to expand.
【００１３】スクリュー出口部５ｂにおける羽根４の外
縁４２と中空軸３の円周方向のなす角度（β）を３０度
〜１００度の範囲に設定することにより、図５（ａ）に
示す従来のスクリュー型曝気機の場合と比較して、スク
リュー入口部での流体損失を増大させることなく、図５
（ｂ）に示すようにスクリュー出口部での水流の絶対速
度（Ｖ）を上昇させることにより、スクリュー５の中空
軸３の軸端に形成した開口部３ｂに大きな負圧を発生さ
せることができ、汚水中に大量の空気を送り込むことが
できる。By setting the angle (β) between the outer edge 42 of the blade 4 at the screw outlet 5b and the circumferential direction of the hollow shaft 3 in the range of 30 to 100 degrees, the conventional method shown in FIG. As compared with the case of the screw type aerator, without increasing the fluid loss at the screw inlet, FIG.
By increasing the absolute velocity (V) of the water flow at the screw outlet as shown in (b), a large negative pressure can be generated in the opening 3b formed at the shaft end of the hollow shaft 3 of the screw 5. , Large amount of air can be sent into the sewage.
【００１４】汚水中でスクリュー５を回転したとき、ス
クリュー５の半径方向に逃げる流れを少なくして、スク
リュー出口部５ｂでの水流の絶対速度を大きくするた
め、図２（ａ）に示すように、羽根４の外縁４２を中空
軸３と直交する断面において中空軸４の回転する方向に
曲げた形状にする。そして、中空軸と直交する断面にお
ける羽根の外縁の中空軸の回転する方向への曲げ角度
（γ）（以下、角度（γ）という。）は、角度（γ）と
曝気性能との関係を示した図８からも明らかなように、
羽根の最大外径（Ｄmax）の位置において１０度〜２２
度の範囲に設定する必要がある（角度（γ）が１０度よ
り小さいと供給される水量が少なくなり、また、２２度
より大きいと縮流となるため供給される空気量が少なく
なり、いずれの場合も曝気性能が低下する。）。なお、
この図において、曝気性能が０．８より小さな値になる
と通常の曝気機としては使用できない状態を示す。As shown in FIG. 2 (a), when the screw 5 is rotated in the sewage, the flow escaping in the radial direction of the screw 5 is reduced and the absolute velocity of the water flow at the screw outlet 5b is increased. The outer edge 42 of the blade 4 has a shape bent in a direction in which the hollow shaft 4 rotates in a cross section orthogonal to the hollow shaft 3. The bending angle (γ) of the outer edge of the blade in the section orthogonal to the hollow shaft in the direction in which the hollow shaft rotates (hereinafter referred to as angle (γ)) indicates the relationship between the angle (γ) and the aeration performance. As is clear from FIG.
10 degrees to 22 at the position of the maximum outer diameter (Dmax) of the blade
(If the angle (γ) is smaller than 10 degrees, the amount of supplied water is reduced. If the angle (γ) is larger than 22 degrees, the amount of supplied air is reduced due to reduced flow. Also in the case of, the aeration performance decreases.) In addition,
In this figure, when the aeration performance becomes a value smaller than 0.8, a state where it cannot be used as a normal aerator is shown.
【００１５】図９に本発明のスクリュー型曝気機の第２
実施例を示す。この実施例は、中空軸３の先端の羽根４
の負圧面側の近傍に切り欠き３ｃを形成し、これによ
り、切り欠き３ｃの部分から空気を汚水中に吸い出して
汚水中に空気をより円滑に供給することができるように
したものである。なお、本実施例のその他の構成は、前
記本発明のスクリュー型曝気機の第１実施例の場合と同
様である。FIG. 9 shows a second example of the screw type aerator according to the present invention.
An example will be described. In this embodiment, the blade 4 at the tip of the hollow shaft 3 is used.
A notch 3c is formed in the vicinity of the negative pressure surface side, so that air can be sucked into the sewage from the portion of the notch 3c to supply the air into the sewage more smoothly. The other configuration of this embodiment is the same as that of the first embodiment of the screw type aerator of the present invention.
【００１６】[0016]
【発明の効果】本発明のスクリュー型曝気機によれば、
スクリュー出口部での水流の絶対速度を高め、大きな負
圧を発生させて、中空軸を通って汚水中に大量の空気を
供給することができ、また、スクリュー出口部での水流
の絶対速度が高められるため、汚水の撹拌力が大きく、
酸素が溶存した水を曝気槽の深くかつ遠くまで送り込む
ことができるため、スクリュー型曝気機の曝気性能を高
めることができる。According to the screw type aerator of the present invention,
By increasing the absolute speed of the water flow at the screw outlet, generating a large negative pressure, it is possible to supply a large amount of air into the wastewater through the hollow shaft, and the absolute speed of the water flow at the screw outlet is Because it is raised, the stirring power of sewage is large,
Since the water in which oxygen is dissolved can be sent deep and far into the aeration tank, the aeration performance of the screw type aerator can be improved.
【図１】本発明のスクリュー型曝気機の第１実施例のス
クリューを示す図である。FIG. 1 is a view showing a screw of a first embodiment of a screw type aerator according to the present invention.
【図２】（ａ）は図１のＩ−Ｉ断面図、（ｂ）は同IIー
II断面図である。2A is a cross-sectional view taken along the line II of FIG. 1, and FIG.
It is II sectional drawing.
【図３】中空軸に対する羽根の巻き角度（θ）を示す図
である。FIG. 3 is a diagram showing a winding angle (θ) of a blade with respect to a hollow shaft.
【図４】本発明のスクリュー型曝気機を示す図である。FIG. 4 is a view showing a screw type aerator according to the present invention.
【図５】スクリューの羽根の角度と速度三角形の関係を
示す図である。FIG. 5 is a diagram showing a relationship between an angle of a blade of a screw and a speed triangle.
【図６】中空軸の外径（ｄ）と羽根の最大外径（Ｄma
x）との比（ｄ／Ｄmax）と曝気性能の関係を示す図であ
る。FIG. 6 shows the outer diameter (d) of the hollow shaft and the maximum outer diameter (Dma) of the blade.
FIG. 6 is a diagram showing a relationship between the ratio (d / Dmax) to the ratio (x) and aeration performance.
【図７】スクリュー出口部における角度（β）と曝気性
能の関係を示す図である。FIG. 7 is a diagram showing the relationship between the angle (β) at the screw outlet and the aeration performance.
【図８】羽根の最大外径（Ｄmax）の位置における角度
（γ）と曝気性能の関係を示す図である。FIG. 8 is a diagram showing the relationship between the angle (γ) at the position of the maximum outer diameter (Dmax) of the blade and the aeration performance.
【図９】（ａ）は本発明のスクリュー型曝気機の第２実
施例のスクリューを示す図であり、（ｂ）はそのIIIーI
II断面図である。9A is a view showing a screw of a second embodiment of the screw type aerator according to the present invention, and FIG.
It is II sectional drawing.
【図１０】（ａ）は従来のスクリュー型曝気機のスクリ
ューを示す図であり、（ｂ）はそのVIーVI断面図であ
る。10A is a diagram showing a screw of a conventional screw type aerator, and FIG. 10B is a sectional view taken along the line VI-VI of FIG.
【図１１】従来のスクリュー型曝気機のスクリューを示
す図である。FIG. 11 is a view showing a screw of a conventional screw type aerator.
１ スクリュー型曝気機 ２ 駆動モータ ３ 中空軸 ３ａ 吸気孔 ３ｂ 開口部 ３ｃ 切り欠き ４ 羽根 ４ａ 羽根の基端部 ４ｂ 羽根の先端部 ４１ 羽根の中空軸との接合部 ４２ 羽根の外縁 ５ スクリュー ５ａ スクリュー入口部 ５ｂ スクリュー出口部 Ｄmax 羽根の最大外径 ｄ 中空軸の外径 ｈmax 羽根の最大高さ ｔ 羽根の先端部の中空軸の軸端開口部からの突出量 α 羽根の中空軸との接合部と中空軸の円周方向のなす
角度 β 羽根の外縁と中空軸の円周方向のなす角度 γ 中空軸と直交する断面における羽根の外縁の中空軸
の回転する方向への曲げ角度DESCRIPTION OF SYMBOLS 1 Screw type aerator 2 Drive motor 3 Hollow shaft 3a Inlet 3b Opening 3c Notch 4 Blade 4a Base end of blade 4b Tip of blade 41 Joint of blade with hollow shaft 42 Outer edge of blade 5 Screw 5a Screw Inlet part 5b Screw outlet part Dmax Maximum outer diameter of blade d External diameter of hollow shaft hmax Maximum height of blade t Projection amount of tip of blade from hollow end of hollow shaft α Joint of blade with hollow shaft Angle between the outer edge of the blade and the circumferential direction of the hollow shaft γ angle between the outer edge of the blade and the circumferential direction of the hollow shaft γ bending angle of the outer edge of the blade in the cross section orthogonal to the hollow shaft in the rotating direction of the hollow shaft
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平８−206681（ＪＰ，Ａ) 特公 昭56−21452（ＪＰ，Ｂ２) 特公 平４−20653（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.7，ＤＢ名) C02F 3/14 - 3/26 B01F 1/00 - 7/32 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-206681 (JP, A) JP-B-56-21452 (JP, B2) JP-B 4-20653 (JP, B2) (58) Field (Int.Cl. 7 , DB name) C02F 3/14-3/26 B01F 1/00-7/32
Claims (1)
を形成した中空軸の先端部に１枚又は複数枚の螺旋状に
形成した板状の羽根を設けたスクリュー型曝気機におい
て、羽根と中空軸との接合部の長さを羽根の最大高さ
（ｈmax）の２．５倍以上で、中空軸に対する羽根の巻
き角度（θ）を３６０度／羽根の枚数以上とし、スクリ
ュー出口部における羽根の外縁と中空軸の円周方向のな
す角度（β）を３０度〜１００度の範囲に設定し、中空
軸の外径（ｄ）と羽根の最大外径（Ｄmax）との比（ｄ
／Ｄmax）を０．２０〜０．５５の範囲に設定するとと
もに、中空軸と直交する断面における羽根の外縁の中空
軸の回転する方向への曲げ角度（γ）を羽根の最大外径
（Ｄmax）の位置において１０度〜２２度の範囲に設定
したことを特徴とするスクリュー型曝気機。1. A screw type aerator which is rotated by a drive motor and provided with one or a plurality of spirally formed plate-like blades at a tip end of a hollow shaft having an opening at a shaft end. The length of the joint between the shaft and the hollow shaft is at least 2.5 times the maximum height (hmax) of the blade, the winding angle (θ) of the blade with respect to the hollow shaft is 360 ° / the number of blades, and the screw outlet portion The angle (β) formed between the outer edge of the blade and the circumferential direction of the hollow shaft in (3) is set in the range of 30 ° to 100 °, and the ratio of the outer diameter (d) of the hollow shaft to the maximum outer diameter (Dmax) of the blade ( d
/ Dmax) is set in the range of 0.20 to 0.55, and the bending angle (γ) of the outer edge of the blade in the section orthogonal to the hollow shaft in the rotating direction of the hollow shaft is determined by the maximum outer diameter (Dmax) of the blade. The screw type aerator is set in the range of 10 to 22 degrees at the position of ()).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14538295A JP3188141B2 (en) | 1995-05-19 | 1995-05-19 | Screw type aerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14538295A JP3188141B2 (en) | 1995-05-19 | 1995-05-19 | Screw type aerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08309385A JPH08309385A (en) | 1996-11-26 |
| JP3188141B2 true JP3188141B2 (en) | 2001-07-16 |
Family
ID=15383959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14538295A Expired - Fee Related JP3188141B2 (en) | 1995-05-19 | 1995-05-19 | Screw type aerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3188141B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202005018432U1 (en) * | 2005-11-23 | 2006-08-24 | Frymakoruma Ag | Homogenizer for viscous fluids has a central feed to two rotating concentric toothed profile rings and with flow guides to increase fluid pressure and prevent cavitation |
| JP2008012474A (en) * | 2006-07-07 | 2008-01-24 | Sumitomo Heavy Industries Environment Co Ltd | Underwater stirring aerator |
| JP2012157801A (en) * | 2011-01-31 | 2012-08-23 | Hitachi Plant Technologies Ltd | Screw for aerator |
| CN102491545B (en) * | 2011-12-21 | 2013-09-25 | 南京蓝深制泵集团股份有限公司 | Double-curved-surface stirring aerator |
| CN111995058B (en) * | 2020-08-26 | 2022-09-13 | 江苏源泉泵业股份有限公司 | Oxygen exposure floating island for water surface environment treatment |
-
1995
- 1995-05-19 JP JP14538295A patent/JP3188141B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08309385A (en) | 1996-11-26 |
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