JP2001029842A - Centrifugal dehydrator - Google Patents

Centrifugal dehydrator

Info

Publication number
JP2001029842A
JP2001029842A JP11208648A JP20864899A JP2001029842A JP 2001029842 A JP2001029842 A JP 2001029842A JP 11208648 A JP11208648 A JP 11208648A JP 20864899 A JP20864899 A JP 20864899A JP 2001029842 A JP2001029842 A JP 2001029842A
Authority
JP
Japan
Prior art keywords
bowl
end wall
discharge
straight body
centrifugal
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.)
Pending
Application number
JP11208648A
Other languages
Japanese (ja)
Inventor
Hiroyoshi Mizukami
浩良 水上
Noboru Suzuki
鈴木　　登
Yasuyuki Yoshida
泰之 吉田
Hiroyuki Matsui
寛幸 松井
Takashi Uchikawa
隆史 内川
Tetsuo Ohinata
徹夫 大日向
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kotobuki Engineering and Manufacturing Co Ltd
Kubota Corp
Original Assignee
Kotobuki Engineering and Manufacturing Co Ltd
Kubota Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kotobuki Engineering and Manufacturing Co Ltd, Kubota Corp filed Critical Kotobuki Engineering and Manufacturing Co Ltd
Priority to JP11208648A priority Critical patent/JP2001029842A/en
Publication of JP2001029842A publication Critical patent/JP2001029842A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B04B2001/2091—Configuration of solids outlets

Abstract

PROBLEM TO BE SOLVED: To improve the performance of a horizontal centrifugal dehydrator, to save energy and to reduce the cost. SOLUTION: A screw conveyor 10 is housed in a bowl 1 rotating at high speed to constitute this dehydrator. In this case, an annular front end wall 4 is slightly projected from the front end of a horizontal straight shell 2 toward the shaft center, and a separated liq. discharge hole 6 is provided in the periphery of the rear end wall of the bowl 1 to constitute the bowl 1. Further, a back pressure adjuster 20 is provided for the screw conveyor 10 to supply a raw liq. to its rear corresponding to the discharge hole 6, to adjust the opening degree of a sludge discharge port 5 and to control the discharge of a dehydrated cake.

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、下水汚泥や工業排水等
の濃縮、脱水、固形物及び分離水の回収を、遠心力によ
り行うようにした、遠心脱水装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal dewatering apparatus for concentrating and dewatering sewage sludge and industrial wastewater, collecting solids and separated water by centrifugal force.

【０００２】[0002]

【従来の技術】汚泥等の固液分離には、従来一般に、デ
カンタ型の遠心脱水機が使用されている。この脱水機は
図11に示すように、横長の直胴部30の先に円錐筒31を接
続して形成した、高速回転されるボウル（外側回転筒）
１内に、内筒（内側回転筒）11に螺旋翼12を設けた、ボ
ウル１と相対速度差をもって回転されるスクリューコン
ベア10を収容し、内筒11よりボウル１の前後中央部内に
汚泥等の原液a を供給して、遠心力により固液分離を行
うものである。そして、ボウル１内で遠心力により沈降
分離された脱水ケーキｂは、螺旋翼12により前端部に向
けて順次掻き寄せられて行き、円錐筒31内でさらに圧密
脱液作用を受け、前端の排泥口５より機外に排出され、
分離液Ｃの方は、反対側であるボウル１の後端壁に設け
た排出孔32からオーバーフローして流出されるようにな
っている。2. Description of the Related Art Conventionally, a decanter type centrifugal dehydrator has been generally used for solid-liquid separation of sludge and the like. As shown in FIG. 11, this dehydrator is formed by connecting a conical cylinder 31 to the tip of a horizontally long straight body portion 30 and is a high-speed rotating bowl (outer rotating cylinder).
A screw conveyor 10 provided with a spiral wing 12 in an inner cylinder (inner rotating cylinder) 11 and rotated with a relative speed difference from the bowl 1 is accommodated in the inner cylinder 1. Is supplied, and solid-liquid separation is performed by centrifugal force. The dewatered cake b settled and separated by the centrifugal force in the bowl 1 is sequentially raked toward the front end by the spiral blade 12, and further subjected to a consolidation and dewatering action in the conical cylinder 31 to discharge the front end. It is discharged out of the machine from the mud hole 5,
The separated liquid C overflows from a discharge hole 32 provided in the rear end wall of the bowl 1 on the opposite side and flows out.

【０００３】このデカンタ型遠心分離機では、ボウル１
内にろ液を貯め込むため、ろ液が、ケーキを排出する排
泥口５から出してしまわないようにするために、分離液
の排出孔32と同程度のレベル（水位）まで前端を小径に
絞った円錐筒31を必要としているのが特徴である。In this decanter type centrifuge, the bowl 1
In order to store the filtrate inside, and to prevent the filtrate from flowing out from the mud outlet 5 for discharging the cake, the front end is reduced in diameter to the same level (water level) as the discharge hole 32 for the separated liquid. The feature is that a conical cylinder 31 narrowed down to is required.

【０００４】[0004]

【発明が解決しようとする課題】しかし、上記従来のデ
カンタ型遠心脱水機では、原液a は、ボウル１の中央部
に供給されたとき、供給直後のボウル直胴部30において
は、高い遠心力場（約2000〜3000Ｇ）により固液分離さ
れるものの、脱水ケーキｂが排出されるボウル円錐部31
では、回転中心からの距離（径）が短くなるために、直
胴部30の回転中心に近い含水率の比較的高いケーキのみ
が排出され、回転中心から遠い含水率の比較的低いケー
キは滞留したまま排出されないようになる。However, in the above-mentioned conventional decanter-type centrifugal dehydrator, when the undiluted solution a is supplied to the central portion of the bowl 1, the centrifugal force of the bowl straight body 30 immediately after the supply is high. Bowl-condensed part 31 from which dewatered cake b is discharged though solid-liquid separation is performed by a place (about 2000-3000 G)
In this case, since the distance (diameter) from the rotation center becomes short, only the cake having a relatively high water content near the rotation center of the straight body portion 30 is discharged, and the cake having a relatively low water content far from the rotation center stays. It will not be discharged as it is.

【０００５】また、脱水ケーキｂは、ボウル内の水位を
越えて排出させるための大きな傾斜の円錐筒を通過する
ので、この部分でのスリップをおこして排出が悪くな
り、脱水ケーキｂが分離液Ｃとともに分離液排出口32よ
り排出されて分離液水質が悪化する等の欠点がある。ま
た、排出される脱水ケーキは、直胴部30の回転中心に近
い含水率の比較的高いものが排出されることから、排出
される脱水ケーキの含水率を低くするために、ボウル１
の回転数を必要以上に高め（約2000〜3000rpm ）て運転
しているのが実状である。したがって大きな動力を要し
ている。[0005] Further, since the dewatered cake b passes through a large inclined conical cylinder for discharging the water beyond the water level in the bowl, slipping occurs at this portion, and the discharge becomes poor, and the dewatered cake b is separated from the separated liquid. C is discharged from the separated liquid discharge port 32 together with C and the quality of the separated liquid deteriorates. Since the dewatered cake to be discharged has a relatively high water content close to the rotation center of the straight body 30, the bowl 1 is used to reduce the water content of the dewatered cake to be discharged.
It is the actual situation that the engine is operated with the rotation speed increased more than necessary (about 2000 to 3000 rpm). Therefore, large power is required.

【０００６】本発明は、上述のようなデカンタ型遠心脱
水機における問題点を解決するためになされたもので、
脱水の促進によって脱水効率の向上が図れるとともに、
ボウル回転数の低減化が実現でき、動力の節減と装置の
簡易、小型化のできる、直胴型の遠心脱水装置を提供し
ようとするものである。The present invention has been made to solve the problems in the decanter-type centrifugal dehydrator as described above.
Dehydration efficiency can be improved by promoting dehydration,
An object of the present invention is to provide a straight-body centrifugal dehydrator capable of reducing the number of rotations of a bowl, saving power and simplifying and miniaturizing the apparatus.

【０００７】[0007]

【課題を解決するための手段】本発明の脱水装置では、
効率のよい固液分離と、分離液のすみやかな排出が行え
るようにするために、分離液の排出孔を、回転中心から
の距離が長くなる、ボウル後端壁の外周部に設けるよう
にしている。それによって、供給原液のすみやかな分離
と脱液が行われ、ボウル内に水面の生ずるのが抑制でき
るとともに、脱水ケーキの搬送距離と滞留時間が長くと
れるようにしている。そして、ボウルは直胴型に形成
し、その前端を若干小径となる排泥口部とし、その排泥
口部に臨んで、排泥口部の広さを調節する背圧調整体を
設けたものとしている。According to the dehydrating apparatus of the present invention,
In order to perform efficient solid-liquid separation and prompt discharge of the separated liquid, the separated liquid discharge hole is provided on the outer peripheral portion of the bowl rear end wall where the distance from the rotation center is long. I have. As a result, the feed stock solution is promptly separated and drained, so that the occurrence of a water surface in the bowl can be suppressed, and the transport distance and residence time of the dewatered cake can be increased. And the bowl was formed in a straight body type, the front end of which was used as a sludge outlet having a slightly smaller diameter, and a back pressure adjusting body for adjusting the width of the sludge outlet was provided facing the sludge outlet. It is assumed.

【０００８】原液は、ボウル内に供給されると直ちに遠
心分離によって、分離液と固形分に分けられ、固形分の
脱水ケーキはさらに遠心分離を受けながら搬送、掻き寄
せられて排出されることになる。そのため、脱水ケーキ
含水率の低下及びボウル回転数の低減が図れ、動力が少
なくてすむようになる。また、分離液は原液供給直後に
排出されるので、ボウル内の水位が極めて浅くなる。し
たがって、従来のデカンタ型の遠心脱水機の欠点であ
る、脱水ケーキが水面を越えて排出するために必要な、
傾斜した長い円錐部を設けなくてすむことになり、ボウ
ルが短尺で装置全体の簡易化が図れることにもなる。[0008] As soon as the stock solution is supplied into the bowl, it is separated into a separated solution and a solid by centrifugation, and the dewatered cake of the solid is conveyed, scraped and discharged while being further subjected to centrifugation. Become. For this reason, the water content of the dewatered cake can be reduced, and the number of rotations of the bowl can be reduced, so that less power is required. Also, since the separated liquid is discharged immediately after the supply of the undiluted liquid, the water level in the bowl becomes extremely shallow. Therefore, a disadvantage of the conventional decanter type centrifugal dewatering machine is that the dewatered cake needs to be discharged over the water surface,
There is no need to provide an inclined long conical portion, and the bowl is short, so that the entire apparatus can be simplified.

【０００９】本発明の脱水装置では、ボウルの形状を、
直胴部に続いてゆるやかに長く延出した傾斜胴部を設け
たものとすることができ、また、ボウルの形状を比較的
短い第1の直胴部に続いて短尺の傾斜胴部と、第１直胴
部より若干小径とした第２の直胴部を連接したものとす
ることができる。In the dewatering device of the present invention, the shape of the bowl is
Following the straight body, it can be provided with a slender body that extends slowly and long, and the shape of the bowl is relatively short, followed by the first straight body, followed by a short inclined body, A second straight body portion having a slightly smaller diameter than the first straight body portion may be connected.

【００１０】また、本発明の脱水装置では、分離液の排
出個所を、ボウル後端壁の外周部のみでなく、ボウルの
後部周壁にも設けることができ、また、ボウル後部の周
壁のみに設けることができる。それにより、分離液の排
出がより促進され、高い処理能力が得られることにな
る。[0010] In the dewatering apparatus of the present invention, the place for discharging the separated liquid can be provided not only on the outer peripheral portion of the rear end wall of the bowl but also on the peripheral rear wall of the bowl, or only on the peripheral wall of the rear portion of the bowl. be able to. Thereby, the discharge of the separated liquid is further promoted, and a high processing capacity is obtained.

【００１１】また、本発明の脱水装置では、ろ液排出部
のスクリーンに付着する汚泥を掻き取るための手段を設
けたものとすることができる。それにより、ろ液排出部
の機能を良好に持続させ、濃度の高い原液の処理にも好
適であり、かつ、長時間の連続運転ができることにな
る。Further, the dewatering device of the present invention may be provided with a means for scraping off the sludge adhering to the screen of the filtrate discharge section. As a result, the function of the filtrate discharge section is maintained satisfactorily, which is suitable for the treatment of a stock solution having a high concentration, and enables continuous operation for a long time.

【００１２】[0012]

【発明の実施の形態】以下、本発明の実施の形態につい
て図面を参照して説明する。図１、図２は本発明装置の
一実施例を示し、図３、図４は、それぞれボウルの形態
を変えた他の実施例を示し、また、図５、図６、図7
は、ろ液排出個所の他の実施例を示し、また図８、図９
は汚泥掻取翼を設けた他の実施例を示し、また、図９は
背圧調整体の他の実施例を示したものである。Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show an embodiment of the apparatus of the present invention, FIGS. 3 and 4 show other embodiments in which the shape of the bowl is changed, respectively, and FIGS.
Fig. 9 shows another embodiment of a filtrate discharge point, and Figs.
Shows another embodiment provided with a sludge scraping blade, and FIG. 9 shows another embodiment of a back pressure adjusting body.

【００１３】図１，図２において、１は高速回転される
ボウル（外側回転筒）で、その中には、回転胴（内側回
転筒）11に螺旋翼12を設けたスクリューコンベア10が、
ボウル１と相対速度差をもって回転されるように収容さ
れている。上記回転胴11の後部には原液a の供給口14を
有する供給室13が設けられ、この供給室13には回転胴の
軸心を通る供給管15が接続されている。なお、図示の例
では、供給管15は回転胴10の後部側から通しているが、
反対に回転軸の前部側から通してもよい。In FIG. 1 and FIG. 2, reference numeral 1 denotes a high-speed rotating bowl (outer rotating cylinder), in which a screw conveyor 10 having a rotating drum (inner rotating cylinder) 11 provided with a spiral blade 12 is provided.
The bowl 1 is accommodated so as to be rotated with a relative speed difference. A supply chamber 13 having a supply port 14 for the undiluted solution a is provided at the rear of the rotary drum 11, and a supply pipe 15 passing through the axis of the rotary drum is connected to the supply chamber 13. In the illustrated example, the supply pipe 15 is passed from the rear side of the rotating drum 10,
Conversely, it may be passed from the front side of the rotating shaft.

【００１４】ボウル１は、全長にわたり同径とした直胴
部２に後端壁３が設けられ、前端には、先細りに傾斜し
た短い環状の前端壁４が設けられており、その内周と回
転胴11との間に、直胴部２の内周と回転胴11との間より
少し狭くなった排泥口５が形成されている。そして、こ
の排泥口５に臨んで、排泥口５の開度すなわち広さを調
節する背圧調整体20が設けられている。この背圧調整体
20は、円筒状をなし、その排泥口５に対向する先端部外
周が先細りの円錐面21に形成されており、スクリューコ
ンベア10の回転胴11の外側に嵌合した状態で、その軸線
方向（矢印イーロ）に進退調節自在とされている。した
がって、背圧調整体20をボウル１の後端方向である矢印
イ方向に前進させれば、排泥口５は挟められて行き、反
対に、矢印ロ方向に後退させれば、排泥口５は広められ
て行くことになる。The bowl 1 is provided with a rear end wall 3 on a straight body portion 2 having the same diameter over the entire length, and a front end with a short annular front end wall 4 which is tapered and inclined. Between the rotating body 11 and the rotating body 11, there is formed a mud hole 5 slightly narrower than between the inner circumference of the straight body part 2 and the rotating body 11. A back pressure adjusting body 20 is provided facing the mud outlet 5 to adjust the opening degree, ie, the size, of the mud outlet 5. This back pressure adjuster
Reference numeral 20 denotes a cylindrical shape, and the outer periphery of the tip end facing the drain port 5 is formed in a tapered conical surface 21, and is fitted in the outside of the rotary drum 11 of the screw conveyor 10 in the axial direction. (Arrow ero) is adjustable. Therefore, if the back pressure adjusting body 20 is advanced in the direction of the arrow A which is the rear end direction of the bowl 1, the mud outlet 5 is caught, and conversely, if it is retracted in the direction of the arrow B, the mud outlet is obtained. 5 will be spread.

【００１５】なお、この背圧調整体20は、図９に示すよ
うに、排泥口５に対向する面がスクリューコンベア10の
軸心に垂直となる円筒形状のものとすることができる。
また、背圧調整体20は、例えばバネ等により後方すなわ
ち図５矢印イ方向に付勢しておき、汚泥の吐出圧に対応
して前後方向に移動し、排泥口５の開度を自動調節でき
るようにすることもできる。As shown in FIG. 9, the back pressure adjusting body 20 may be formed in a cylindrical shape having a surface facing the drain port 5 perpendicular to the axis of the screw conveyor 10.
Further, the back pressure adjusting body 20 is urged rearward, for example, by a spring or the like, that is, in the direction shown by the arrow A in FIG. 5, and moves back and forth in accordance with the discharge pressure of the sludge, and automatically controls the opening of the sludge outlet 5. It can be adjustable.

【００１６】また、ボウル１の後端壁３には、回転中心
からの距離ができるだけ長くとれる位置である外周部近
傍に位置して、分離液の排出孔６が設けられている。こ
の排出孔６は例えば図２に示すように、複数の扇形のも
のを周方向に隔設したり、あるいは、図示を略したが、
後端壁３の外周部に沿って多数の小孔を隔設するのがよ
い。本発明では、分離液の排出を回転中心からできるだ
け離れた位置で行えるようにすることが重要であり、そ
れによって、分離液の排出がすみやかに行われるように
なるとともに、ボウル１内の水位が殆ど形成されぬか、
形成されても極く浅くてすむことになり、それが脱水性
能を向上させることになる。Further, the rear end wall 3 of the bowl 1 is provided with a separation liquid discharge hole 6 located near the outer peripheral portion where the distance from the rotation center can be as long as possible. For example, as shown in FIG. 2, a plurality of fan-shaped discharge holes 6 are circumferentially spaced from each other, or the discharge holes 6 are not shown.
A number of small holes are preferably provided along the outer peripheral portion of the rear end wall 3. In the present invention, it is important that the separation liquid can be discharged at a position as far as possible from the center of rotation, so that the separation liquid can be discharged promptly and the water level in the bowl 1 is reduced. Hardly formed,
Even if it is formed, it will be extremely shallow, which will improve the dewatering performance.

【００１７】脱水処理する原液ａは、矢印のように供給
管15から供給室13に入り、供給口14からボウル１の中、
すなわち、回転胴11と直胴部２との環状空間内に供給さ
れる。そして、高速回転するボウル１の遠心力によっ
て、その直胴部２の内周面にはりついて行き、遠心力に
よる固液分離が行われるとともに、分離された液体分で
ある分離液ｃは、ボウル後端壁３に設けられた排出孔６
より機外に排出される。The stock solution a to be dehydrated enters the supply chamber 13 from the supply pipe 15 as shown by the arrow,
That is, it is supplied into the annular space between the rotating drum 11 and the straight drum portion 2. Then, due to the centrifugal force of the bowl 1, which rotates at a high speed, the bowl 1 sticks to the inner peripheral surface of the straight body portion 2 and the solid-liquid separation is performed by the centrifugal force. Discharge hole 6 provided in end wall 3
It is more discharged outside the aircraft.

【００１８】固形分と若干残留した液分を含む脱水ケー
キｂは、スクリューコンベア10の螺旋翼12によってボウ
ル１の前端方向へと掻き寄せられて行きながら、さらに
遠心力による分離作用を受けて、残留液分の分離が進
み、その分離液ｃは排出孔６より排出される。そして、
ボウル１の前部に搬送された脱水ケーキｂなどは、前端
にある環状の前端壁４と背圧調整体20の円錐面21との間
で圧密作用を受け、その挟められた排泥口５より機外に
排出されることになる。その際、原液a の性状等に対応
して背圧調整体20の進退を調節することにより、所望の
脱水ケーキを得るようにすることができる。また、背圧
調整体の進退調節を、脱水ケーキの圧密状態（搬送トル
ク）を検知して自動制御することにより、安定した脱水
ケーキを得ることができる。The dewatered cake b containing the solid content and the slightly remaining liquid content is scraped by the spiral blade 12 of the screw conveyor 10 toward the front end of the bowl 1 and further subjected to a separating action by centrifugal force. The separation of the remaining liquid proceeds, and the separated liquid c is discharged from the discharge hole 6. And
The dewatered cake b and the like conveyed to the front portion of the bowl 1 are subjected to a compaction action between the annular front end wall 4 at the front end and the conical surface 21 of the back pressure adjusting body 20, and the trapped drain port 5 is sandwiched between them. It will be discharged more out of the aircraft. At this time, a desired dewatered cake can be obtained by adjusting the advance and retreat of the back pressure adjusting body 20 according to the properties of the stock solution a and the like. In addition, a stable dewatered cake can be obtained by automatically controlling the forward / backward adjustment of the back pressure adjusting body by detecting the consolidation state (transport torque) of the dewatered cake.

【００１９】本発明の装置では、上記のように、原液a
はボウル１内の後部に供給され、ボウル１の前端へと搬
送されながら脱液され、分離液Ｃはボウル１後端壁１の
外周部に設けられた排出孔６から機外に排出される。そ
して、大部分の固液分離と分離水ｃの排出がボウル１の
後部で行われることから、ボウル１内に乱流の生ずるこ
とがなく、脱水ケーキｂの滞留時間も長くなる。したが
って、従来のような、直胴部の先に長大な円錐筒部分は
必要がなく、ボウル全体の長さも短くてすむことにな
る。In the apparatus of the present invention, as described above, the undiluted solution a
Is supplied to the rear part of the bowl 1 and is drained while being conveyed to the front end of the bowl 1, and the separated liquid C is discharged out of the machine through a discharge hole 6 provided in the outer peripheral part of the rear end wall 1 of the bowl 1. . Since most of the solid-liquid separation and the discharge of the separated water c are performed at the rear portion of the bowl 1, no turbulent flow occurs in the bowl 1, and the residence time of the dewatered cake b becomes longer. Therefore, unlike the conventional case, there is no need to provide a long conical tube portion at the end of the straight body portion, and the overall length of the bowl can be reduced.

【００２０】また、本発明では、ボウル１の形態を変え
たものに実施することができる。図３、図４はその各実
施例を示したものである。図３の実施例では、ボウル１
の形態を、比較的短尺とした直胴部25の先に、先端の径
を直胴部25の径より若干小径とした比較的長いゆるやか
な傾斜胴部26を延長して形成しており、この傾斜胴部26
により搬送されてくる脱水ケーキｂが排泥口５近くに溜
まりやすくなる。そして、ろ過排出部６はボウル１の全
長の後部にあたる直胴部25に設けられる。その他の構成
は図１、図２の実施例におけると同様である。In the present invention, the bowl 1 can be embodied in a different form. 3 and 4 show the respective embodiments. In the embodiment of FIG.
In the form of a relatively short length of the straight body part 25, a relatively long gentle slope body part 26 whose tip diameter is slightly smaller than the diameter of the straight body part 25 is formed in front of the relatively short straight body part 25, This inclined body 26
As a result, the dewatered cake b conveyed tends to accumulate near the discharge port 5. The filtration / discharge unit 6 is provided on a straight body 25 at the rear of the entire length of the bowl 1. Other configurations are the same as those in the embodiment of FIGS.

【００２１】図４の実施例では、ボウルの形態を、比較
的短尺とした第１直胴部27に続いて短尺の傾斜胴部28
が、そして、さらにその先に、直胴部27の径より若干径
小とした第２直胴部29が延長して設けられ、第２直胴部
29の先端には、軸心方向に短く突出する環状の前端壁４
を設けて形成されている。この場合も、ろ液排出部７は
第１直胴部27に設けられる。その他の構成は図１、図２
の実施例におけると同様である。図５の実施例は、ろ液
排出部６を、上記のような直胴部２，25，27の周壁に代
えて後端壁３の外周部に変えたものである。その他の構
成は図１，図２の実施例におけると同様である。In the embodiment shown in FIG. 4, the shape of the bowl is changed from a relatively short first straight body 27 to a short inclined body 28.
However, further ahead, a second straight body portion 29 having a diameter slightly smaller than the diameter of the straight body portion 27 is provided to be extended, and the second straight body portion is provided.
At the tip of 29, an annular front end wall 4 that projects short in the axial direction
Are formed. Also in this case, the filtrate discharge part 7 is provided in the first straight body part 27. Other configurations are shown in FIGS. 1 and 2.
This is the same as in the embodiment. In the embodiment of FIG. 5, the filtrate discharge part 6 is changed to the outer peripheral part of the rear end wall 3 instead of the peripheral walls of the straight body parts 2, 25, 27 as described above. Other configurations are the same as those in the embodiment of FIGS.

【００２２】本発明の装置では分離液Ｃを排出する個所
を、上記のようなボウル１の後端壁３のほか、ボウル１
後部の周壁に設けたものとすることができる。図５はそ
の一実施例を示したもので、後端壁３の外周部に排出孔
６を設けたボウル１の後部の周壁に、原液ａをろ過して
分離水ｃを排出するためのろ過排出部７が設けられてい
る。このろ液排出部７は、たとえば図６に示すように、
直胴部の周方向に沿って多数開設された排出孔８とその
内側に、固形分をろ過する多孔質プラスチック成形体や
金網、セラミック、金属の焼結体、ろ布等によるスクリ
ーン９を添設した構造となっている。なお、このろ液排
出部は、上記のような構造に限定されるものではなく、
排出孔８とスクリーン９との組合せによるものであれ
ば、適宜構造を変更することができる。In the apparatus of the present invention, the place where the separated liquid C is discharged is determined not only by the rear end wall 3 of the bowl 1 as described above, but also by the bowl 1
It can be provided on the rear peripheral wall. FIG. 5 shows an embodiment of the present invention, in which a filtration solution for filtering the undiluted solution a and discharging the separated water c is provided on the peripheral wall at the rear portion of the bowl 1 provided with a discharge hole 6 on the outer peripheral portion of the rear end wall 3. A discharge unit 7 is provided. This filtrate discharge part 7 is, for example, as shown in FIG.
A large number of discharge holes 8 are formed along the circumferential direction of the straight body portion, and a screen 9 made of a porous plastic molded body, a wire mesh, a sintered body of ceramic or metal, a filter cloth, or the like for filtering solids is provided inside the discharge holes 8. It has a built structure. In addition, this filtrate discharge part is not limited to the structure as described above,
The structure can be changed as appropriate as long as it is a combination of the discharge hole 8 and the screen 9.

【００２３】このようにすれば、分離液ｃは排出孔６と
ろ液排出部７の両方から排出されるので、分離液ｃの排
出能力が大幅に増大することになり、濃度の薄い汚泥の
処理や高負荷に対しても能率のよい処理が可能となる。
なお、この実施例におけるその他の構成については、さ
きの図１、図２の実施例におけると同様であるから、そ
の説明を省略する。また、この実施例の装置では、ボウ
ル１の形態を図３または図４の実施例のものに代えるこ
とができる。また、図７に示すように、分離液ｃを排出
する個所を、ボウル１の周壁のみに設け（ろ液排出部
７）、ボウル後端壁３には設けない構造とすることもで
きる。In this way, the separation liquid c is discharged from both the discharge hole 6 and the filtrate discharge part 7, so that the discharge capacity of the separation liquid c is greatly increased, and the sludge having a low concentration is treated. And efficient processing can be performed even for high loads.
The other configurations in this embodiment are the same as those in the embodiments of FIGS. 1 and 2 described above, and the description thereof will be omitted. Further, in the apparatus of this embodiment, the form of the bowl 1 can be replaced with that of the embodiment of FIG. 3 or FIG. Further, as shown in FIG. 7, it is also possible to adopt a structure in which a place for discharging the separated liquid c is provided only on the peripheral wall of the bowl 1 (filtrate discharge part 7) and is not provided on the rear end wall 3 of the bowl.

【００２４】図８，図９は、直胴部の周壁に設けたろ液
排出部６に付着する汚泥を掻き取る手段を設けた実施例
を示したものである。この実施例では、スクリューコン
ベア10の方には、上記ろ液排出部７と対応して、螺旋翼
12の一部を切り欠き、その部分の回転筒11に、先端部が
スクリーン９と摺接してスクリーン９に付着した汚泥の
掻取翼16の複数が放射状に装着されている。この掻取翼
16は、スクリーン９に付着した汚泥を単に掻き取るだけ
でなく、その汚泥や脱水ケーキに対しての搬送力を有す
るよう軸線に対して角度を保つようにするのが好まし
い。FIGS. 8 and 9 show an embodiment in which means for scraping off the sludge adhering to the filtrate discharge section 6 provided on the peripheral wall of the straight body section is provided. In this embodiment, the screw conveyor 10 has a spiral wing corresponding to the filtrate discharge section 7.
A part of 12 is cut out, and a plurality of sludge scraping blades 16 attached radially to the screen 9 with the tip sliding on the screen 9 are radially mounted on the rotary cylinder 11 at that part. This scraping wing
It is preferable that the slug 16 not only scrape off the sludge attached to the screen 9 but also maintain an angle with respect to the axis so as to have a conveying force for the sludge and the dewatered cake.

【００２５】[0025]

【発明の効果】以上説明したように、本発明によれば、
分離液の排出個所が、ボウル後端壁の軸心より遠い外周
部に設けられているとともに、原液を分離液の排出個所
に近いボウル後部内に供給するようにしており、また、
ボウル前端の排泥口に対して背圧調整体を設けて、排泥
口の開度を調節できるようにしたので、次のように多く
の優れた効果を奏する。As described above, according to the present invention,
A discharge point of the separated liquid is provided at an outer peripheral portion farther from the axis of the rear end wall of the bowl, and the undiluted liquid is supplied to a rear part of the bowl close to the discharge point of the separated liquid.
Since the back pressure adjusting body is provided for the mud outlet at the front end of the bowl so that the opening of the mud outlet can be adjusted, a number of excellent effects are achieved as follows.

【００２６】（１）原液の供給とろ液の排出部が近いの
で、原液が供給されると、直ちに、遠心分離と分離液の
排出が行われることになり、脱水効率が高いので、ボウ
ルの回転数を低くしても、従来機同様の脱水効率が得ら
れ、動力が少なくてすむことになる。(1) Since the supply of the undiluted solution and the discharge of the filtrate are close to each other, the centrifugation and the discharge of the separated liquid are immediately performed as soon as the undiluted solution is supplied. Even if the number is reduced, the same dewatering efficiency as that of the conventional machine can be obtained, and less power is required.

【００２７】（２）原液は供給後直ちに遠心分離されて
分離液の排出が行われるので、ボウル内に水面が殆どで
きず、したがって、従来機のように、ボウル内に水面が
できることから長い傾斜で絞りを大きくした長大な円錐
筒を設ける必要がなく、僅かに出張った前端壁を設けれ
ば足りることになるとともに、脱水ケーキの搬送距離が
短くてすむことから、ボウルの長さを短縮でき、しかも
長大な円錐筒部を設けないですむので、装置のコストを
大巾に低減できる。(2) Since the undiluted solution is centrifuged immediately after the supply and the separated solution is discharged, the water surface is hardly formed in the bowl. It is not necessary to provide a long conical cylinder with a large aperture, and it is sufficient to provide a front end wall that has been slightly traveled, and the length of the bowl can be shortened because the transport distance of the dewatered cake can be short. In addition, since there is no need to provide a long conical cylinder, the cost of the apparatus can be greatly reduced.

【００２８】（３）原液の供給と分離液の排出位置が近
く、しかもボウル内に水面が殆どできないことから、ボ
ウル内での逆流が殆ど生じず、脱水率のよりケーキの搬
送が円滑にできる。(3) Since the supply position of the undiluted solution and the discharge position of the separated solution are close to each other and there is almost no water surface in the bowl, there is almost no backflow in the bowl, and the cake can be transported more smoothly due to the dewatering rate. .

【００２９】（４）排泥口部に設けた背圧調整体を進退
させることによって、排泥口部の開度を調節して脱水ケ
ーキの排出抑制による圧密作用の調節が自在にできるの
で、脱水性の向上が図れるとともに、安定した脱水ケー
キを得ることができ、また、脱水しにくい性状の汚泥等
各種の汚泥に広く適用できる。(4) By moving the back pressure adjusting member provided in the mud outlet portion forward and backward, the degree of opening of the mud outlet portion can be adjusted, and the compaction action can be freely adjusted by suppressing the discharge of the dewatered cake. The dewatering property can be improved, a stable dewatered cake can be obtained, and the present invention can be widely applied to various types of sludge such as sludge that is difficult to dewater.

【００３０】（５）また、分離液（ろ液）の排出個所を
ボウル後部周壁にも設けた装置では、分離液の排出がよ
り円滑に促進され、処理能力が増大でき、原液の大量処
理や高負荷での処理が能率よく行える。(5) In a device in which a discharge point of the separated liquid (filtrate) is also provided on the rear peripheral wall of the bowl, the discharge of the separated liquid can be promoted more smoothly, the processing capacity can be increased, and a large amount of undiluted liquid can be processed. Processing under high load can be performed efficiently.

【００３１】 （６）また、ろ液排出部に、そのスクリ
ーンに付着した汚泥を掻き落とす手段 を設けた装置で
は、スクリーンに目詰まりの生ずるのを防止でき、分離
液の排出が常に円滑に支障なく行え、濃度の高い原液に
対しても処理効率が高く維持できる。(6) In a device provided with a means for scraping off the sludge attached to the screen in the filtrate discharge section, it is possible to prevent the screen from being clogged, and the discharge of the separated liquid is always obstructed. The processing efficiency can be maintained high even for a stock solution having a high concentration.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明装置の一実施例を示す側断面図である。FIG. 1 is a side sectional view showing an embodiment of the apparatus of the present invention.

【図２】図１のＡ−Ａ断面図である。FIG. 2 is a sectional view taken along line AA of FIG.

【図３】ボウル形態の他の実施例を示す側断面図であ
る。FIG. 3 is a side sectional view showing another embodiment of a bowl configuration.

【図４】同さらに他の実施例を示す側断面図である。FIG. 4 is a side sectional view showing still another embodiment.

【図５】ろ液（分離液）の排出部をボウル周壁にも設け
た実施例を示す側断面図である。FIG. 5 is a side sectional view showing an embodiment in which a filtrate (separated liquid) discharge section is also provided on a bowl peripheral wall.

【図６】ろ液排出部の拡大断面図である。FIG. 6 is an enlarged sectional view of a filtrate discharge part.

【図７】ろ液排出部をボウルの後部周壁のみに設けた実
施例を示す側断面図である。FIG. 7 is a side sectional view showing an embodiment in which a filtrate discharge part is provided only on a rear peripheral wall of a bowl.

【図８】汚泥掻取翼を設けた実施例を示す側断面図であ
る。FIG. 8 is a side sectional view showing an embodiment provided with a sludge scraping blade.

【図９】同半部の拡大正断面図である。FIG. 9 is an enlarged front sectional view of the half part.

【図10】背圧調整体の他の実施例を示す側断面図であ
る。FIG. 10 is a side sectional view showing another embodiment of the back pressure adjusting body.

【図11】従来のデカンタ型の装置を示す側断面図であ
る。FIG. 11 is a side sectional view showing a conventional decanter-type device.

【符号の説明】[Explanation of symbols]

１ ボウル ２ 直胴部 ３ 後端壁 ４ 前端環状壁 ５ 排泥口 ６ 分離液排出部 ７ ろ液排出部 ８ 排出口 ９ スクリーン 10 スクリューコンベア 11 回転胴 12 螺旋翼 14 供給口 16 掻取翼 20 背圧調整体 21 円錐面 25 直胴部 26、28 傾斜胴部 27 第１直胴部 29 第２直胴部 DESCRIPTION OF SYMBOLS 1 Bowl 2 Straight body part 3 Rear end wall 4 Front end annular wall 5 Drainage port 6 Separated liquid discharge part 7 Filtrate discharge part 8 Discharge port 9 Screen 10 Screw conveyor 11 Rotary drum 12 Spiral blade 14 Supply port 16 Scraper blade 20 Back pressure adjusting body 21 Conical surface 25 Straight body 26, 28 Inclined body 27 First straight body 29 Second straight body

───────────────────────────────────────────────────── フロントページの続き (72)発明者 鈴木 登 東京都中央区日本橋室町３−１−３ 株式 会社クボタ東京本社内 (72)発明者 吉田 泰之 大阪市浪速区敷津東１−２−47 株式会社 クボタ大阪本社内 (72)発明者 松井 寛幸 大阪市浪速区敷津東１−２−47 株式会社 クボタ大阪本社内 (72)発明者 内川 隆史 大阪市西淀川区西島２−１−６ 株式会社 クボタ新淀川環境プラントセンタ−内 (72)発明者 大日向 徹夫 東京都新宿区新宿１丁目８番１号 コトブ キ技研工業株式会社内 Ｆターム(参考） 4D057 AA10 AA11 AB01 AC01 AC06 AD01 AE03 AF05 BC11 BC15 CB01 4D059 AA03 BE38  ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Noboru Suzuki 3-1-3 Nihonbashi Muromachi, Chuo-ku, Tokyo Kubota Tokyo Head Office (72) Inventor Yasuyuki Yoshida 1-2-47 Shikitsuhigashi, Naniwa-ku, Osaka-shi Kubota Osaka Co., Ltd. (72) Inventor Hiroyuki Matsui 1-2-47 Shikitsuhigashi, Namiwa-ku, Osaka-shi Kubota Osaka Co., Ltd. (72) Inventor Takashi Uchikawa 2-1-6 Nishijima, Nishiyodogawa-ku, Osaka Co., Ltd. Inside the Kubota Shin-Yodogawa Environmental Plant Center (72) Inventor Tetsuo Ohinata 1-8-1 Shinjuku, Shinjuku-ku, Tokyo Kotobuki Giken Kogyo Co., Ltd. F-term (reference) 4D057 AA10 AA11 AB01 AC01 AC06 AD01 AE03 AF05 BC11 BC15 CB01 4D059 AA03 BE38

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】 高速回転されるボウル内に、これと相対
速度差をもって回転されるスクリューコンベアを収容し
た遠心脱水装置において、ボウルを、横型の円筒形をな
す直胴部の先端に、軸心方向に短く突出する環状の前端
壁を設けて形成するとともに、ボウルの後端壁の外周部
に、分離液の排出孔を設け、そして、スクリューコンベ
アの方には、ボウルの後部内に原液を供給する手段を設
け、また、ボウル前端の排泥口に対し、脱水ケーキの排
出の隙間を調節する背圧調整体を、ボウルの軸線方向に
移動調節自在に設けたことを特徴とする、遠心脱水装
置。1. A centrifugal dewatering apparatus in which a screw conveyor rotated at a relative speed difference is accommodated in a bowl rotated at a high speed, wherein the bowl is attached to a tip of a horizontal cylindrical straight body by an axial center. In addition to forming an annular front end wall that protrudes shortly in the direction, a discharge hole for separated liquid is provided on the outer peripheral portion of the rear end wall of the bowl, and the undiluted solution is provided in the rear part of the bowl toward the screw conveyor. A centrifugal centrifuge wherein a supply means is provided, and a back pressure adjusting member for adjusting a clearance of the dewatered cake is provided in a discharge port at a front end of the bowl so as to be movable in an axial direction of the bowl. Dehydration equipment. 【請求項２】 ボウルを、後端壁を設けた直胴部に続い
て、前端が若干小径となるようにした傾斜胴部を延出し
て形成したことを特徴とする、請求項１記載の遠心脱水
装置。2. The bowl according to claim 1, wherein the bowl is formed by extending a straight body having a rear end wall, followed by an inclined body having a slightly smaller diameter at a front end. Centrifugal dehydrator. 【請求項３】 ボウルを、後端壁を設けた第１の直胴部
に、若干先細りとなる短尺な傾斜胴部と、それに続い
て、第１の直胴部より若干小径とした第２の直胴部を延
出し、その先端に軸心方向に短く突出する環状の前端壁
を設けて形成したことを特徴とする、請求項１記載の遠
心脱水装置。3. A bowl having a first straight body provided with a rear end wall, a short inclined body slightly tapered, and a second slightly smaller diameter than the first straight body. 2. The centrifugal dewatering apparatus according to claim 1, wherein the straight body portion is formed by providing an annular front end wall which protrudes short in the axial direction at the end. 【請求項４】 ボウルの後部の周壁に、分離液の排出孔
とそれに添接のろ過用スクリーンとよりなるろ液排出部
を設けたことを特徴とする、請求項１，２または３記載
の遠心脱水装置。4. A filtrate discharge part comprising a discharge hole for a separated liquid and a filtration screen attached thereto is provided on a peripheral wall at a rear portion of the bowl. Centrifugal dehydrator. 【請求項５】 スクリューコンベアの螺旋翼の一部を切
り欠き、その部分に、ろ液排出部のスクリーンに付着す
る汚泥の掻取翼を設けたことを特徴とする、請求項４記
載の遠心脱水装置。5. The centrifugal machine according to claim 4, wherein a part of a spiral blade of the screw conveyor is cut out, and a scraper blade for sludge adhering to a screen of a filtrate discharge part is provided in that part. Dehydration equipment.
JP11208648A 1999-07-23 1999-07-23 Centrifugal dehydrator Pending JP2001029842A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11208648A JP2001029842A (en) 1999-07-23 1999-07-23 Centrifugal dehydrator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11208648A JP2001029842A (en) 1999-07-23 1999-07-23 Centrifugal dehydrator

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JP2015131275A (en) * 2014-01-14 2015-07-23 三菱重工環境・化学エンジニアリング株式会社 Centrifugal dehydrator
CN109354369A (en) * 2018-10-22 2019-02-19 长沙理工大学 A kind of control method of mud disposal system
KR20190036470A (en) 2017-09-27 2019-04-04 미츠비시 쥬코 칸쿄 카가쿠 엔지니어링 가부시키가이샤 Centrifugal dehydration apparatus
CN113582494A (en) * 2021-08-21 2021-11-02 谷媛媛 Constructed wetland structure with desilting mediation function
KR102352828B1 (en) * 2021-07-01 2022-01-18 한국환경기계주식회사 Screw decanter for adulteration treatment
KR102400051B1 (en) * 2021-07-23 2022-05-19 한국환경기계주식회사 Adulteration disposal equipment advanced sand treatment performance

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015131275A (en) * 2014-01-14 2015-07-23 三菱重工環境・化学エンジニアリング株式会社 Centrifugal dehydrator
WO2015107989A1 (en) * 2014-01-14 2015-07-23 三菱重工環境・化学エンジニアリング株式会社 Centrifugal dehydration device
CN105813759A (en) * 2014-01-14 2016-07-27 三菱重工环境·化学工程株式会社 Centrifugal dehydration device
TWI586435B (en) * 2014-01-14 2017-06-11 三菱重工環境 化學工程股份有限公司 Centrifugal dehydration apparatus
KR20180002908A (en) * 2014-01-14 2018-01-08 미츠비시 쥬코 칸쿄 카가쿠 엔지니어링 가부시키가이샤 Centrifugal dehydration device
KR102037588B1 (en) * 2014-01-14 2019-10-28 미츠비시 쥬코 칸쿄 카가쿠 엔지니어링 가부시키가이샤 Centrifugal dehydration device
KR20190036470A (en) 2017-09-27 2019-04-04 미츠비시 쥬코 칸쿄 카가쿠 엔지니어링 가부시키가이샤 Centrifugal dehydration apparatus
CN109354369A (en) * 2018-10-22 2019-02-19 长沙理工大学 A kind of control method of mud disposal system
CN109354369B (en) * 2018-10-22 2023-12-05 长沙理工大学 Control method of slurry treatment system
KR102352828B1 (en) * 2021-07-01 2022-01-18 한국환경기계주식회사 Screw decanter for adulteration treatment
KR102400051B1 (en) * 2021-07-23 2022-05-19 한국환경기계주식회사 Adulteration disposal equipment advanced sand treatment performance
CN113582494A (en) * 2021-08-21 2021-11-02 谷媛媛 Constructed wetland structure with desilting mediation function

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