JP3188142B2 - Screw type aerator - Google Patents
Screw type aeratorInfo
- Publication number
- JP3188142B2 JP3188142B2 JP14538395A JP14538395A JP3188142B2 JP 3188142 B2 JP3188142 B2 JP 3188142B2 JP 14538395 A JP14538395 A JP 14538395A JP 14538395 A JP14538395 A JP 14538395A JP 3188142 B2 JP3188142 B2 JP 3188142B2
- Authority
- JP
- Japan
- Prior art keywords
- screw
- hollow shaft
- blade
- type aerator
- screw type
- 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 - Lifetime
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
Landscapes
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【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（羽根と中空軸との接合
部と中空軸の円周方向のなす角度（α）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 (α) formed in the circumferential direction between the joint between the blade and the hollow shaft and the hollow shaft is smaller at the screw outlet).
【０００４】ところで、羽根と中空軸との接合部と中空
軸の円周方向のなす角度（α）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 (α) between the joint between the blade and the hollow shaft and the circumferential direction of the hollow shaft is made smaller toward the screw outlet, the water flow at the screw outlet is reduced as shown in FIG. The absolute speed (V) does not increase, and a large negative pressure cannot be generated. Therefore, the amount of air supplied into the wastewater through the hollow shaft is small. Also,
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、羽根と中空軸との接合
部と中空軸の円周方向のなす角度（α）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と中空軸との接合部
と中空軸の円周方向のなす角度（α）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と中空
軸との接合部と中空軸の円周方向のなす角度（α）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。Further, in order to increase the absolute velocity (V) of the water flow at the screw outlet, it is necessary to increase the angle (α) between the joint between the blade and the hollow shaft and the circumferential direction of the hollow shaft. However, in this case, in the conventional screw type aerator, the angle (α) between the joint between the blade and the hollow shaft at the screw inlet and the circumferential direction of the hollow shaft is inevitably large. By the way, since there is no swirl component in the flow at the screw inlet, if the angle (α) between the joint between the blade and the hollow shaft at the screw inlet and the circumferential direction of the hollow shaft becomes larger, the flow at the screw inlet becomes larger. There is a problem that the fluid loss increases.
【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
が高く、構造が簡単で製造の容易なスクリュー型曝気機
を提供することを目的とする。また、本発明は、スクリ
ュー入口部での流体損失が小さ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 The present invention solves the above-mentioned problems of the conventional screw type aerator, and provides a screw type aerator having a high aeration performance, a simple structure and easy production. Aim. Another object of the present invention is to provide a screw type aerator having a small fluid loss at the screw inlet.
【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３倍以上とし、前記接合部と中空軸の円周
方向のなす角度（α）を一定で、かつ３０度〜８０度の
範囲に設定するとともに、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の範囲に設定したことをことを要旨とする。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 blade and the hollow shaft is set to be at least three times the maximum height (hmax) of the blade, and the circumferential direction of the joint and the hollow shaft is (Α) is set to be constant and in the range of 30 to 80 degrees, and the ratio (d / Dmax) of the outer diameter (d) of the hollow shaft to the maximum outer diameter (Dmax) of the blade is set to 0. .20-
The gist is that it is set in the range of 0.55.
【０００８】この場合において、スクリュー入口部の近
傍における羽根の外径を他の部分よりも小さく形成する
ことが望ましい。In this case, it is desirable that the outer diameter of the blade in the vicinity of the screw inlet is formed smaller than that of the other portions.
【０００９】[0009]
【作用】本発明のスクリュー型曝気機によれば、羽根と
中空軸との接合部と中空軸の円周方向のなす角度（α）
を一定としたので、スクリューの構造が簡単で製造が容
易であり、また、接合部と中空軸の円周方向のなす角度
（α）を３０度〜８０度の範囲に設定するとともに、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の範囲に設定した
ので、羽根と中空軸との接合部の長さを羽根の最大高さ
の３倍以上としたことと相まって、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, the angle (α) between the joint between the blade and the hollow shaft and the circumferential direction of the hollow shaft is formed.
, The structure of the screw is simple and easy to manufacture, and the angle (α) between the joint and the hollow shaft in the circumferential direction is set in the range of 30 ° to 80 °, and the hollow shaft is Since the ratio (d / Dmax) between the outer diameter (d) of the blade and the maximum outer diameter (Dmax) of the blade is set in the range of 0.20 to 0.55, the length of the joint between the blade and the hollow shaft is set to Combined with having at least three times the maximum height of the blade, increasing the absolute speed of the water flow at the screw outlet, generating a large negative pressure, and supplying a large amount of air into the wastewater through the hollow shaft Can be. 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.
【００１０】また、スクリュー入口部の近傍における羽
根の外径を他の部分よりも小さく形成することにより、
スクリュー入口部での流体損失を低減することができ
る。Further, by forming the outer diameter of the blade in the vicinity of the screw inlet portion smaller than that of the other portions,
Fluid loss at the screw inlet can be reduced.
【００１１】[0011]
【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.
【００１２】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 without contacting each other at substantially equal intervals. 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.
【００１３】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３倍以上とするとともに、
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 41 of the blade 4 with the hollow shaft 3 (the blade 4
The total length of the joint from the base end 4a to the tip 4b) is at least three times the maximum height (hmax) of the blade 4 and
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 apparent from FIG. 6 showing the relationship between this ratio (d / Dmax) and the aeration performance. Like, 0.20
(D / Dmax) is smaller than 0.20, the amount of supplied air is reduced, and if (d / Dmax) is smaller than 0.55, the supplied air amount is smaller. In this case, when the aeration performance is smaller than 0.8, it indicates that the aerator cannot be used as a normal aerator.) In order to increase the strength of the screw 5, preferably, the amount of protrusion (t) of the tip 4 b of the blade 4 from the opening 3 b formed at the shaft end of the hollow shaft 3 is set to a value equal to the maximum height (hmax) of the blade 4. 5 times or less.
【００１４】また、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、角度（α）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〜８０度の範
囲に設定する必要がある。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。なお、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、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 (α) (hereinafter referred to as “angle (α)”) between the joint 41 between the blade 4 and the hollow shaft 3 and the hollow shaft 3 in the circumferential direction is determined by the angle (α) and the aeration performance. As is clear from FIG. 7 showing the relationship, it is necessary to set the angle in the range of 30 to 80 degrees. In this figure, when the aeration performance becomes a value smaller than 0.8, the state cannot be used as a normal aerator. The angle (β) between the outer edge 42 of the blade 4 and the circumferential direction of the hollow shaft 3 (hereinafter, referred to as angle (β)) is set at It is desirable to configure so as to enlarge at 5b.
【００１５】羽根４と中空軸３との接合部４１と中空軸
の円周方向のなす角度（α）を一定で、かつ３０度〜８
０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。The angle (α) between the joint 41 between the blade 4 and the hollow shaft 3 and the circumferential direction of the hollow shaft is constant, and 30 ° to 8 °.
By setting the angle to 0 degree, the fluid loss at the screw inlet is not increased as compared with the case of the conventional screw type aerator shown in FIG.
By increasing the absolute velocity (V) of the water flow at the screw outlet as shown in (1), 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 the sewage A large amount of air can be blown into it.
【００１６】ところで、スクリュー出口部５ｂでの水流
の絶対速度を高めるために、スクリュー出口部５ｂの角
度（α）を大きくすると、スクリュー入口部５ａの（角
度（α））も大きくなり、スクリュー入口部５ａでの流
体損失が増大することとなる。これを図８を用いてさら
に具体的に説明する。図８は、スクリュー入口部５ａ及
びとスクリュー出口部５ｂの角度（α）を５５度に設定
した場合の速度三角形を示す。この図からも明らかなよ
うに、スクリュー入口部５ａの相対流入角を角度（α）
と合わせるためには、周速をスクリュー出口部５ｂの周
速の約５０％にしなければならない。このため、図３に
示したスクリュー５の回転投影図のように、スクリュー
入口部５ａの近傍における羽根４の外径を他の部分より
も小さく形成することが好ましく、これにより、スクリ
ュー入口部５ａでの流体損失を軽減することができる。By the way, if the angle (α) of the screw outlet 5b is increased in order to increase the absolute velocity of the water flow at the screw outlet 5b, the (angle (α)) of the screw inlet 5a becomes larger, and the screw inlet 5a becomes larger. The fluid loss in the part 5a will increase. This will be described more specifically with reference to FIG. FIG. 8 shows a speed triangle when the angle (α) of the screw inlet 5a and the screw outlet 5b is set to 55 degrees. As is apparent from this figure, the relative inflow angle of the screw inlet 5a is set to the angle (α).
In order to match, the peripheral speed must be about 50% of the peripheral speed of the screw outlet 5b. For this reason, as shown in the rotational projection of the screw 5 shown in FIG. 3, it is preferable that the outer diameter of the blade 4 in the vicinity of the screw inlet 5a be smaller than that of the other portions. Fluid loss can be reduced.
【００１７】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
曲げた形状にすることが望ましい。As shown in FIG. 2 (a), when the screw 5 is rotated in 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. It is desirable that the outer edge 42 of the blade 4 be bent in a direction in which the hollow shaft 4 rotates in a cross section orthogonal to the hollow shaft 3.
【００１８】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.
【００１９】[0019]
【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。また、本発明のスクリュー型曝気機
は、スクリューの構造が簡単で製造が容易であるため、
スクリュー型曝気機の製造コストを低廉にすることがで
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. In addition, the screw type aerator of the present invention has a simple screw structure and is easy to manufacture,
The manufacturing cost of the screw type aerator can be reduced.
【００２０】さらに、スクリュー入口部の近傍における
羽根の外径を他の部分よりも小さく形成すれば、スクリ
ュー出口部での水流の絶対速度を大きくするために羽根
の中空軸との接合部と中空軸の円周方向のなす角度
（α）を大きく設定しても、スクリュー入口部での流体
損失を軽減することができる。Further, if the outer diameter of the blade in the vicinity of the screw inlet is formed smaller than that of the other portion, the joint between the blade and the hollow shaft in order to increase the absolute velocity of the water flow at the screw outlet is increased. Even if the angle (α) formed in the circumferential direction of the shaft is set large, the fluid loss at the screw inlet can be reduced.
【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】スクリューの回転投影図である。FIG. 3 is a rotation projection view of a screw.
【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】角度（α）と曝気性能の関係を示す図である。FIG. 7 is a diagram showing a relationship between an angle (α) and aeration performance.
【図８】角度（α）と速度三角形の関係を示す図であ
る。FIG. 8 is a diagram showing a relationship between an angle (α) and a speed triangle.
【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 periphery of the blade and the circumferential 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 (2)
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３倍以上とし、前記接合部と中空軸の円周
方向のなす角度（α）を一定で、かつ３０度〜８０度の
範囲に設定するとともに、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 three times the maximum height (hmax) of the blade, the angle (α) between the joint and the hollow shaft in the circumferential direction is constant, and 30 ° to 80 °. Degrees, and the ratio (d / Dmax) of the outer diameter (d) of the hollow shaft to the maximum outer diameter (Dmax) of the blade is 0.20 to 0.20.
A screw type aerator characterized by being set to a range of 0.55.
外径を他の部分よりも小さく形成したことを特徴とする
請求項１記載のスクリュー型曝気機。2. The screw type aerator according to claim 1, wherein the outer diameter of the blade near the screw inlet is smaller than that of the other part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14538395A JP3188142B2 (en) | 1995-05-19 | 1995-05-19 | Screw type aerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14538395A JP3188142B2 (en) | 1995-05-19 | 1995-05-19 | Screw type aerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08309384A JPH08309384A (en) | 1996-11-26 |
| JP3188142B2 true JP3188142B2 (en) | 2001-07-16 |
Family
ID=15383981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14538395A Expired - Lifetime JP3188142B2 (en) | 1995-05-19 | 1995-05-19 | Screw type aerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3188142B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012157801A (en) * | 2011-01-31 | 2012-08-23 | Hitachi Plant Technologies Ltd | Screw for aerator |
-
1995
- 1995-05-19 JP JP14538395A patent/JP3188142B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08309384A (en) | 1996-11-26 |
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