JPH0751200Y2 - Digester agitator - Google Patents
Digester agitatorInfo
- Publication number
- JPH0751200Y2 JPH0751200Y2 JP1991002520U JP252091U JPH0751200Y2 JP H0751200 Y2 JPH0751200 Y2 JP H0751200Y2 JP 1991002520 U JP1991002520 U JP 1991002520U JP 252091 U JP252091 U JP 252091U JP H0751200 Y2 JPH0751200 Y2 JP H0751200Y2
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- digestion tank
- scum
- screw
- stirrer
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Landscapes
- Treatment Of Sludge (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本考案は、下水処理汚泥等の消化
槽に設置する攪拌機の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of an agitator installed in a digestion tank for sewage treatment sludge or the like.
【０００２】[0002]
【従来の技術】下水処理汚泥等を消化槽に投入し、加温
状態に保持すると、嫌気性醗酵が行われてメタンガスを
主体とする消化ガスが発生し、このガスがエネルギ−源
として活用されることはよく知られている。そして、上
記嫌気性醗酵中には、消化槽内の汚泥を攪拌する操作が
行われている。2. Description of the Related Art When sewage treatment sludge or the like is put into a digestion tank and kept in a heated state, anaerobic fermentation is carried out to generate a digestive gas mainly composed of methane gas, which is utilized as an energy source. It is well known. Then, during the anaerobic fermentation, an operation of stirring the sludge in the digestion tank is performed.
【０００３】本考案においては、消化槽中の汚泥の上面
を、便宜上、汚泥の液面と言うことにする。In the present invention, the upper surface of the sludge in the digestion tank is referred to as the liquid level of the sludge for convenience.
【０００４】図３は攪拌機を備えた消化槽の一例を模式
的に示した断面図である。図において、１は消化槽であ
り、１１は汚泥を示す。そして、消化槽１の上部には攪
拌機２が設置されており、この攪拌機２の下端部にはド
ラフトチュ−ブ１０が接続されている。FIG. 3 is a sectional view schematically showing an example of a digestion tank equipped with a stirrer. In the figure, 1 is a digestion tank, and 11 is sludge. A stirrer 2 is installed above the digestion tank 1, and a draft tube 10 is connected to the lower end of the stirrer 2.
【０００５】上記消化槽の攪拌機２を起動すると、攪拌
機２が正回転の場合には、ドラフトチュ−ブ１０中の汚
泥が下向流の流れを起こし、消化槽１中の上部の汚泥
は、図中、矢印のように、ドラフトチュ−ブ１０に吸い
込まれ、その下部から吐出する。このため、消化槽１内
には循環流が形成され、汚泥１１の攪拌混合が行われる
ようになっている。When the stirrer 2 of the digestion tank is started, when the stirrer 2 is rotated normally, the sludge in the draft tube 10 causes a downward flow, and the upper sludge in the digestion tank 1 is In the figure, as indicated by an arrow, the draft tube 10 is sucked and discharged from the lower part thereof. For this reason, a circulation flow is formed in the digestion tank 1, and the sludge 11 is agitated and mixed.
【０００６】上記のような機械攪拌式の消化槽に設置す
る攪拌機としては、特開平１−１３０７９９号公報に示
されたものがある。図２は機械攪拌式の消化槽に設置す
る従来の攪拌機を示す図である。３はモ−タ、４はモ−
タの軸に連結された回転軸、５は回転軸４の下部に取り
付けられ、汚泥を上方向又は下方向に吐出して軸流型の
流れパタ−ンを形成するスクリュ−、６はスクリュ−５
を囲んだ位置に配置する状態に懸架され、下端にドラフ
トチュ−ブ１０を接続するスクリュ−ケ−シングであ
る。又、７は軸受のケ−シングである。２１は回転軸４
に取り付けられたディスクである。このディスク２１
は、汚泥の液面が上限に達した際に、攪拌機を逆回転し
てスクリュ−ケ−シング６内の汚泥の流れを上向流にし
た場合に、上部スクリュ−２０により、押し上げられた
汚泥を周辺のスカム上に撒き散らし、スカムを湿潤にし
て固化させないようにするために備えている。As a stirrer to be installed in the above mechanical stirring type digestion tank, there is one disclosed in Japanese Patent Application Laid-Open No. 1-130799. FIG. 2 is a view showing a conventional stirrer installed in a mechanical stirring type digestion tank. 3 is a motor, 4 is a motor
A rotary shaft 5 connected to the shaft of the rotary shaft 5 is attached to the lower part of the rotary shaft 4, and is a screw for discharging sludge upward or downward to form an axial flow pattern, and 6 is a screw. 5
It is a screw casing that is suspended in a state of being surrounded by and that is connected to the draft tube 10 at the lower end. Reference numeral 7 is a bearing casing. 21 is a rotary shaft 4
Is a disk attached to. This disc 21
When the liquid level of the sludge reaches the upper limit, the sludge is pushed up by the upper screw 20 when the stirrer is rotated in the reverse direction to make the sludge flow in the screw casing 6 upward. To disperse the scum on the surrounding scum so that it does not solidify due to wetting.
【０００７】[0007]
【考案が解決しようとする課題】消化槽中において、汚
泥の消化中にはスカムが生成する。このスカムは、本
来、汚泥と混合させて順次抜き出し、消化汚泥として処
理すべきものであるが、実際には、汚泥液面の表面部に
浮上してしまう。このため、消化槽１中にドラフトチュ
−ブ１０を設けて汚泥を循環させる流れを形成させ、汚
泥を攪拌すると共に、表面部のスカムを汚泥中に引き込
んで混合させることを図っている。[Problems to be Solved by the Invention] Scum is generated during digestion of sludge in a digestion tank. Originally, this scum should be mixed with sludge and sequentially extracted and treated as digested sludge, but in reality, it scatters on the surface part of the sludge liquid surface. For this reason, the draft tube 10 is provided in the digestion tank 1 to form a flow for circulating sludge to stir the sludge, and at the same time, scum on the surface portion is drawn into the sludge to be mixed.
【０００８】しかし、従来の攪拌機を使用した場合に
は、表面部のスカムが汚泥中に引き込まれる状態にはな
らない。即ち、攪拌機の回転軸４は相当の速さで回転
（例えば、数百ｒｐｍ）しているので、回転軸４が浸漬
されている周辺の汚泥には遠心力が作用し、特に、回転
軸４付近のスカムその周辺に押し寄せられ、汚泥と共に
スクリュ−ケ−シング６中へ吸い込まれるのが阻害され
る。従って、スクリュ−ケ−シング６中へのスカムの吸
い込み流量が減少してしまう。However, when the conventional stirrer is used, the scum on the surface is not brought into the sludge. That is, since the rotating shaft 4 of the stirrer rotates at a considerable speed (for example, several hundred rpm), centrifugal force acts on the sludge around which the rotating shaft 4 is immersed, and in particular, the rotating shaft 4 The scum in the vicinity is pushed around and is prevented from being sucked into the screw casing 6 together with the sludge. Therefore, the suction flow rate of scum into the screw casing 6 is reduced.
【０００９】このため、従来の攪拌機を使用した場合に
おいては、汚泥表面部に、次第にスカムが蓄積する。そ
して、ある期間が経過すると、このスカムが固化してし
まう。スカムがこのような状態になると、もはや、汚泥
を攪拌する程度の操作では、これを細分化して汚泥と混
合させることはできなくなる。そこで、消化槽１上部の
マンホ−ルを開け、ここから圧力水を注水したり、或い
は棒状物で衝撃を加えたりして、固化したスカムを破砕
して汚泥と混合できる状態にしている。そして、上記ス
カム破砕作業には多大の労力を要する。Therefore, when a conventional stirrer is used, scum gradually accumulates on the surface of the sludge. Then, after a certain period of time, the scum solidifies. When the scum is in such a state, it is no longer possible to subdivide the sludge and mix it with the sludge by an operation of stirring the sludge. Therefore, the manhole on the upper part of the digestion tank 1 is opened, and pressurized water is injected from here, or a shock is applied by a rod-like object, so that the solidified scum can be crushed and mixed with the sludge. A great deal of labor is required for the scum crushing work.
【００１０】本考案は、消化槽中の汚泥表面部における
スカムの蓄積を防止できる消化槽の攪拌機を提供するこ
とを目的とする。An object of the present invention is to provide a stirrer for a digestion tank which can prevent accumulation of scum on the surface of sludge in the digestion tank.
【００１１】[0011]
【課題を解決するための手段及び作用】上記の目的を達
成するために、本考案においては、消化槽の上部に設置
され、スクリュ−を備えた回転軸を有し、その下部にド
ラフトチュ−ブを接続するスクリュ−ケ−シングが前記
スクリュ−を囲んで配置された攪拌機において、少なく
とも汚泥に接する部位とスクリュ−ケ−シングとの間の
回転軸の外側に固定カバ−を設けている。In order to achieve the above object, in the present invention, a draft shaft is installed in the upper part of the digestion tank and has a rotating shaft equipped with a screw. In a stirrer in which a screw casing for connecting a bush surrounds the screw, a fixed cover is provided at least on the outer side of the rotary shaft between the portion in contact with sludge and the screw casing.
【００１２】回転軸の外側に固定カバ−を設けると、モ
−タの駆動によって回転軸が回転しても、カバ−は回転
しないので、その周辺の汚泥に遠心力が作用することは
ない。従って、表面部の汚泥の吸い込みが阻害されなく
なる。If a fixed cover is provided on the outer side of the rotary shaft, the cover does not rotate even if the rotary shaft rotates due to the driving of the motor, so that centrifugal force does not act on the sludge around it. Therefore, the suction of sludge on the surface is not obstructed.
【００１３】[0013]
【実施例】図１は本考案の一実施例を示す断面図であ
る。図１において、図２と同じ構成部分については同一
の符号を付し説明を省略する。本実施例においては、回
転軸４の外側に固定カバ−８が設けられている。この固
定カバ−８はその上部が軸受のケ−シング７に取り付け
られ、その下端はスクリュ−ケ−シング６内まで挿入さ
れている。固定カバ−８によって回転軸４を囲うべき範
囲は、少なくとも汚泥に接する部位とスクリュ−ケ−シ
ング６との間であり、固定カバ−８の取付構造は軸受の
ケ−シング７に取り付ける構造に限らず、消化槽に懸架
する構造であってもよい。２２は固定カバ−８に取り付
けられたディスクである。1 is a sectional view showing an embodiment of the present invention. In FIG. 1, the same components as those in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted. In this embodiment, a fixed cover 8 is provided outside the rotary shaft 4. An upper portion of the fixed cover 8 is attached to the casing 7 of the bearing, and a lower end of the fixed cover 8 is inserted into the screw casing 6. The range in which the rotary shaft 4 should be surrounded by the fixed cover 8 is at least between the portion in contact with the sludge and the screw casing 6, and the fixed cover 8 is attached to the casing 7 of the bearing. The structure is not limited, and may be suspended in the digestion tank. Reference numeral 22 is a disk attached to the fixed cover 8.
【００１４】本実施例の攪拌機には、固定カバ−８が設
けられているので、スカムが回転軸４による遠心力を受
けなくなり、消化槽１の表面部のスカムは絶えずスクリ
ュ−ケ−シング６内に引き込まれる状態になる。このた
め、本考案の攪拌機を使用すれば、広範囲のスカムを汚
泥中に引き込んで攪拌混合させることができる。このよ
うにして、消化槽の表面部にスカムが蓄積する現象は解
消される。Since the agitator of this embodiment is provided with the fixed cover 8, the scum is no longer subjected to the centrifugal force by the rotating shaft 4, and the scum on the surface of the digestion tank 1 is constantly screwed to the casing 6. It is in a state of being drawn in. Therefore, if the stirrer of the present invention is used, a wide range of scum can be drawn into sludge and mixed by stirring. In this way, the phenomenon that scum accumulates on the surface of the digestion tank is eliminated.
【００１５】[0015]
【考案の効果】本考案の攪拌機においては、回転軸の外
側に固定カバ−を設けているので、回転軸が回転して
も、回転軸を覆うカバ−は回転しないので、回転軸付近
のスカムが遠心力によって周辺に押しやられることがな
くなり、表面部のスカムが順調にスクリュ−ケ−シング
中へ吸い込まれるようになる。In the stirrer of the present invention, since the fixed cover is provided on the outer side of the rotary shaft, the cover covering the rotary shaft does not rotate even if the rotary shaft rotates. Will not be pushed to the periphery by centrifugal force, and the scum on the surface will be smoothly sucked into the screw casing.
【００１６】従って、本考案の攪拌機を使用すれば、消
化槽の表面部にスカムが蓄積する状態は起こらなくな
る。Therefore, when the stirrer of the present invention is used, the state where scum accumulates on the surface of the digestion tank does not occur.
【００１７】又、本考案の攪拌機は、汚泥液面の表面部
におけるスカムを容易に汚泥中に引き込むことができ、
広範囲のスカムを引き込む攪拌混合ができるので、汚泥
液面の広い大型消化槽にも適用できる。Further, the agitator of the present invention can easily draw the scum on the surface portion of the sludge liquid surface into the sludge,
It can be applied to a large digestion tank with a wide sludge liquid level because it can be stirred and mixed to draw in a wide range of scum.
【図１】本考案の一実施例を示す断面図である。FIG. 1 is a sectional view showing an embodiment of the present invention.
【図２】機械攪拌式の消化槽に設置する従来の攪拌機を
示す図である。FIG. 2 is a view showing a conventional stirrer installed in a mechanical stirring type digestion tank.
【図３】攪拌機を備えた消化槽の一例を模式的に示した
断面図である。FIG. 3 is a cross-sectional view schematically showing an example of a digestion tank equipped with a stirrer.
１ 消化槽 ２ 攪拌機 ３ モ−タ ４ 回転軸 ５ スクリュ− ６ スクリュ−ケ−シング ７ 軸受のケ−シング ８ 固定カバ− １０ ドラフトチュ−ブ １１ 汚泥 1 Digestion tank 2 Stirrer 3 Motor 4 Rotating shaft 5 Screw 6 Screw casing 7 Bearing casing 8 Fixed cover 10 Draft tube 11 Sludge
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平２−131198（ＪＰ，Ａ) 実開 昭60−24395（ＪＰ，Ｕ) 実開 平２−61498（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-131198 (JP, A) Actually open 60-24395 (JP, U) Actually open 2-61498 (JP, U)
Claims (1)
備えた回転軸を有し、その下部にドラフトチュ−ブを接
続するスクリュ−ケ−シングが前記スクリュ−を囲んで
配置された攪拌機において、少なくとも汚泥に接する部
位と前記スクリュ−ケ−シングとの間の前記回転軸の外
側に固定カバ−を設けたことを特徴とする消化槽の攪拌
機。1. A stirrer having a rotary shaft provided at the upper part of the digestion tank, the screw shaft having a screw, and a screw casing for connecting a draft tube to the lower part of the rotary shaft surrounding the screw. 3. A digestion tank agitator according to claim 1, wherein a fixed cover is provided outside the rotary shaft between at least a portion in contact with sludge and the screw casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1991002520U JPH0751200Y2 (en) | 1991-01-30 | 1991-01-30 | Digester agitator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1991002520U JPH0751200Y2 (en) | 1991-01-30 | 1991-01-30 | Digester agitator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0498500U JPH0498500U (en) | 1992-08-26 |
| JPH0751200Y2 true JPH0751200Y2 (en) | 1995-11-22 |
Family
ID=31730701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1991002520U Expired - Lifetime JPH0751200Y2 (en) | 1991-01-30 | 1991-01-30 | Digester agitator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0751200Y2 (en) |
-
1991
- 1991-01-30 JP JP1991002520U patent/JPH0751200Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0498500U (en) | 1992-08-26 |
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