JP2967020B2 - Screw for aeration stirrer - Google Patents
Screw for aeration stirrerInfo
- Publication number
- JP2967020B2 JP2967020B2 JP5297519A JP29751993A JP2967020B2 JP 2967020 B2 JP2967020 B2 JP 2967020B2 JP 5297519 A JP5297519 A JP 5297519A JP 29751993 A JP29751993 A JP 29751993A JP 2967020 B2 JP2967020 B2 JP 2967020B2
- Authority
- JP
- Japan
- Prior art keywords
- screw
- aeration
- power
- tip
- blade
- 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
Landscapes
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はスクリュー型自給式曝気
撹拌機に於いて、特に通気量を絞り込んだときに動力増
大を抑制できる形状とした省電力型の曝気撹拌機用スク
リューに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw-type self-contained aeration stirrer, and more particularly to a power-saving screw for an aeration stirrer having a shape capable of suppressing an increase in power when a ventilation amount is reduced. .
【０００２】[0002]
【従来の技術】従来曝気装置に用いられる自給式曝気機
の曝気撹拌機用スクリューはスクリュー軸の先端に螺旋
羽根を取り付け、さらに必要に応じて螺旋羽根の先端に
遠心羽根を組み合わせたものが提案されている。2. Description of the Related Art Conventionally, a screw for aeration and agitator of a self-contained aerator used in an aeration apparatus is proposed in which a spiral blade is attached to a tip of a screw shaft and, if necessary, a centrifugal blade is combined with a tip of the spiral blade. Have been.
【０００３】[0003]
【発明が解決しようとする課題】しかし、従来の曝気撹
拌用スクリューは、その回転により中央部に負圧が発生
し、通気時には負圧により空気が吸引され中央部は多量
に空気を含んだ水となるが、嫌気撹拌のために通気量を
絞り込んだとき、空気の減った分だけ前方の水を中央部
に引き込む流れが生じ、中央部の回転する羽根に当たる
ため動力が増大する。この動力が大幅に増大することに
より、電動機容量のアップを強いられ、設備費やランニ
ングコストが割高になる欠点を有していた。However, in the conventional screw for aeration and agitation, a negative pressure is generated in a central portion by rotation of the screw. At the time of ventilation, air is sucked by the negative pressure, and water in the central portion contains a large amount of air. However, when the amount of ventilation is reduced for anaerobic agitation, a flow of drawing water forward into the center by the reduced amount of air occurs, and the power hits the rotating blades in the center to increase power. When the power greatly increases, the capacity of the motor is increased, and the equipment cost and the running cost are disadvantageously high.
【０００４】本発明は曝気時の通気量を確保し、かつ特
に嫌気撹拌時の動力が曝気時に対し増大する割合を抑制
することの可能なスクリューにより、省電力のスクリュ
ー式曝気撹拌機を提供することを目的とする。The present invention provides a power-saving screw-type aeration stirrer with a screw capable of securing a ventilation rate during aeration and suppressing the rate of increase in power during anaerobic stirring compared to aeration. The purpose is to:
【０００５】[0005]
【課題を解決するための手段】本発明は上記目的を達成
するためになしたもので、スクリュー軸の先端部に数条
の螺旋羽根を一体に設けた曝気撹拌用スクリューにおい
て、螺旋羽根の先端に遠心羽根を形成し、該遠心羽根の
先端に、スクリュー軸の軸心と直交することにより、ス
クリュー軸の開口部に対向するように円板を配したこと
を特徴とする。DISCLOSURE OF THE INVENTION The present invention has been made to achieve the above object, and in an aeration / agitating screw in which a plurality of spiral blades are integrally provided at a tip portion of a screw shaft, a tip of the spiral blade is provided. A centrifugal vane is formed on the tip of the centrifugal vane, and a disc is disposed at the tip of the centrifugal vane so as to be orthogonal to the axis of the screw shaft so as to face the opening of the screw shaft.
【０００６】[0006]
【作用】従来のスクリューでは、その回転により中央部
に負圧が発生し、通気時には負圧により空気が吸引され
中央部は多量に空気を含んだ水となるが、通気を絞ると
空気の減った分だけ前方の水を中央部に引き込む流れが
生じ、中央部の回転する羽根に当たるため動力が増大す
る。これを阻止するため、本発明の曝気撹拌用スクリュ
ーは、スクリュー軸の先端部に数条の螺旋羽根を一体に
設けた曝気撹拌用スクリューにおいて、螺旋羽根の先端
に遠心羽根を形成し、この遠心羽根の先端に、スクリュ
ー軸の軸心に直交することにより、スクリュー軸の開口
部に対向するように円板を配するようにしている。この
場合において、遠心羽根の寸法を、螺旋羽根との合流点
直径以内に抑えるようにすることが望ましい。このよう
に、円板を設けることで前方の水が中央部に引き込まれ
る流れは殆ど阻止される。なお、一部の水は遠心羽根外
周先端から内側に流れ込もうとするが、遠心力で外周へ
はじき出される。さらに、最大通気量を保持し得る遠心
羽根の寸法を、螺旋羽根との合流点直径以内に抑えるよ
うにすると、通気時の通気量は変化なく、通気時さらに
は通気を２％以下に絞り込んだときにも、上述の抵抗が
軽減され動力を低下させることができる。With the conventional screw, a negative pressure is generated in the central portion by the rotation of the screw, and the air is sucked by the negative pressure at the time of ventilation, and the central portion becomes a water containing a large amount of air. As a result, a flow is generated that draws forward water into the center, and the power hits the rotating blades in the center, increasing power. In order to prevent this, the screw for aeration and stirring of the present invention is a screw for aeration and stirring in which several spiral blades are integrally provided at the tip of the screw shaft. A disk is arranged at the tip of the blade so as to be orthogonal to the axis of the screw shaft so as to face the opening of the screw shaft. In this case, it is desirable to keep the size of the centrifugal blade within the confluence diameter with the spiral blade. In this way, by providing the disk, the flow in which the water in front is drawn into the central portion is almost prevented. Some water tries to flow inward from the distal end of the centrifugal blade, but is repelled outward by centrifugal force. Further, when the size of the centrifugal blade capable of holding the maximum airflow is controlled to be within the diameter of the confluence with the spiral blade, the airflow at the time of airflow does not change, and the airflow at the time of airflow is further reduced to 2% or less. At times, the above-described resistance is reduced, and the power can be reduced.
【０００７】[0007]
【実施例】以下、本発明の曝気撹拌機用スクリューを図
示の実施例に基づいて説明する。図において１は、自給
式の曝気撹拌機用スクリューの中空状のスクリュー軸
で、このスクリュー軸の先端部に数条の螺旋羽根２を所
定間隔とピッチで螺旋状にして一体に設けるとともに、
この螺旋羽根２の先端に遠心羽根３を一体に形成するよ
うにする。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a screw for an aeration stirrer according to the present invention will be described with reference to the illustrated embodiment. In the figure, reference numeral 1 denotes a hollow screw shaft of a screw for a self-supply type aeration stirrer, and a plurality of spiral blades 2 are integrally provided in a tip portion of the screw shaft in a spiral at a predetermined interval and a pitch,
The centrifugal blade 3 is formed integrally with the tip of the spiral blade 2.
【０００８】このようにして、螺旋羽根２の先端に遠心
羽根３を一体に設けて曝気撹拌用スクリューを構成する
とともに、遠心羽根３の先端に、スクリュー軸１の軸心
と直交することにより、スクリュー軸１の開口部と対向
するように円板４を配して一体とする。In this way, the centrifugal blade 3 is integrally provided at the tip of the spiral blade 2 to constitute a screw for aeration and stirring, and the tip of the centrifugal blade 3 is orthogonal to the axis of the screw shaft 1. The disk 4 is arranged so as to face the opening of the screw shaft 1 to be integrated.
【０００９】さらに、螺旋羽根２の先端に遠心羽根３を
一体に設ける場合、遠心羽根３を螺旋羽根２との合流点
直径以内に抑えるようにする。この遠心羽根３は、図示
のように螺旋羽根と個別に形成し、これを溶着等にて一
体とするか、あるいは螺旋羽根２の先端部を屈曲して形
成することも可能である。Further, when the centrifugal blade 3 is provided integrally with the tip of the spiral blade 2, the centrifugal blade 3 is kept within the diameter of the confluence with the spiral blade 2. The centrifugal blade 3 may be formed separately from the spiral blade as shown in the figure, and may be integrated by welding or the like, or may be formed by bending the tip of the spiral blade 2.
【００１０】次に、上記実施例の曝気撹拌用スクリュー
を用いた実験により効果を測定した結果の一例をあげて
説明する。実験に使用したスクリューは、通気時の動力
が７．５ｋｗ程度のもので、先端に羽根最大外径の７０
％程度の円板４を取り付けた。その結果、通気時の通気
量及び動力は変化なく、通気を２％以下に絞り込んだと
きの動力は約８％（０．８１ｋｗ）低下した。Next, an example of the result of measuring the effect by an experiment using the aeration screw of the above embodiment will be described. The screw used in the experiment had a power of about 7.5 kW at the time of ventilation.
% Disk 4 was attached. As a result, the ventilation amount and power at the time of ventilation did not change, and the power at the time of narrowing the ventilation to 2% or less was reduced by about 8% (0.81 kW).
【００１１】さらに、円板４を取り付けたスクリュー
で、螺旋羽根２と遠心羽根３の縁の合流点５の径まで軸
芯に平行に遠心羽根３の突出を削り落とした結果、通気
時の通気量には殆ど影響なく、動力が通気時で約６％
（０．４４ｋｗ）、通気を絞り込んだときで約１８％
（１．７６ｋｗ）低下した。Further, the protrusion of the centrifugal blade 3 is cut in parallel with the axis to the diameter of the confluence point 5 at the edge of the spiral blade 2 and the centrifugal blade 3 with the screw to which the disk 4 is attached. Almost no effect on volume, power is about 6% when vented
(0.44kw), about 18% when the ventilation is narrowed down
(1.76 kW).
【００１２】以上の如き実験結果により、従来のスクリ
ューに対し円板４を取り付け遠心羽根最大直径を螺旋羽
根２と遠心羽根３の縁の合流点５の直径とすることで、
通気量に影響なく通気を絞り込んだときの動力、さらに
は通気時の動力を低下せしめることが可能となり省電力
化が図れる。From the above experimental results, by attaching the disk 4 to the conventional screw and setting the maximum diameter of the centrifugal blade to the diameter of the confluence point 5 of the edges of the spiral blade 2 and the centrifugal blade 3,
The power at the time of narrowing the ventilation without affecting the ventilation amount, and further, the power at the time of ventilation can be reduced, and power saving can be achieved.
【００１３】[0013]
【発明の効果】本発明の曝気撹拌機用スクリューによれ
ば、螺旋羽根の先端に遠心羽根を形成し、該遠心羽根の
先端に、スクリュー軸の軸心と直交することにより、ス
クリュー軸の開口部に対向するように円板を配している
ため、通気量に影響なく通気を絞り込んだときの動力、
さらには通気時の動力を低下せしめることができ、これ
により省電力化が図れる等の利点を有する。According to the screw for the aeration stirrer of the present invention, the centrifugal blade is formed at the tip of the spiral blade, and the tip of the centrifugal blade is orthogonal to the axis of the screw shaft, thereby opening the screw shaft. Because the disk is arranged to face the part, the power when the ventilation is narrowed down without affecting the ventilation amount,
Furthermore, the power at the time of ventilation can be reduced, which has advantages such as power saving.
【図１】本発明の曝気撹拌機用スクリューの一実施例を
示す正面図である。FIG. 1 is a front view showing an embodiment of a screw for an aeration stirrer of the present invention.
【図２】従来の曝気撹拌機用スクリューを示す正面図で
ある。FIG. 2 is a front view showing a screw for a conventional aeration stirrer.
【図３】本発明の曝気撹拌機用スクリューの無通気時と
通気時の水及び空気の流れを示す説明図である。FIG. 3 is an explanatory view showing the flow of water and air during non-aeration and during aeration of the screw for an aeration stirrer of the present invention.
【図４】従来の曝気撹拌機用スクリューの無通気時と通
気時の水及び空気の流れを示す説明図である。FIG. 4 is an explanatory view showing the flow of water and air during non-ventilation and during ventilation of a screw for a conventional aeration stirrer.
【図５】スクリュー軸の動力と動力低下との関係を示す
グラフ図である。FIG. 5 is a graph showing the relationship between the power of the screw shaft and the power reduction.
１ スクリュー軸 ２ 螺旋羽根 ３ 遠心羽根 ４ 円板 ５ 螺旋羽根と遠心羽根の縁の合流点 DESCRIPTION OF SYMBOLS 1 Screw shaft 2 Spiral blade 3 Centrifugal blade 4 Disk 5 Confluence of edge of spiral blade and centrifugal blade
Claims (1)
を一体に設けた曝気撹拌用スクリューにおいて、螺旋羽
根の先端に遠心羽根を形成し、該遠心羽根の先端に、ス
クリュー軸の軸心と直交することにより、スクリュー軸
の開口部に対向するように円板を配したことを特徴とす
る曝気撹拌機用スクリュー。 Claims: 1. A plurality of spiral blades are provided at the tip of a screw shaft.
The screw for aeration and agitation provided with the
A centrifugal blade is formed at the tip of the root, and the tip of the centrifugal blade is
By being perpendicular to the axis of the screw shaft, the screw shaft
The disk is arranged to face the opening of
Screw for aeration stirrer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5297519A JP2967020B2 (en) | 1993-11-02 | 1993-11-02 | Screw for aeration stirrer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5297519A JP2967020B2 (en) | 1993-11-02 | 1993-11-02 | Screw for aeration stirrer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07124589A JPH07124589A (en) | 1995-05-16 |
| JP2967020B2 true JP2967020B2 (en) | 1999-10-25 |
Family
ID=17847577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5297519A Expired - Fee Related JP2967020B2 (en) | 1993-11-02 | 1993-11-02 | Screw for aeration stirrer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2967020B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102661282A (en) * | 2012-04-16 | 2012-09-12 | 杭州萧山美特轻工机械有限公司 | Open type spiral paper pulp pump |
-
1993
- 1993-11-02 JP JP5297519A patent/JP2967020B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07124589A (en) | 1995-05-16 |
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