JP2013000662A - Centrifugal separator - Google Patents

Centrifugal separator Download PDF

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JP2013000662A
JP2013000662A JP2011134362A JP2011134362A JP2013000662A JP 2013000662 A JP2013000662 A JP 2013000662A JP 2011134362 A JP2011134362 A JP 2011134362A JP 2011134362 A JP2011134362 A JP 2011134362A JP 2013000662 A JP2013000662 A JP 2013000662A
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flocculant
screw conveyor
supply pipe
axis
end side
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JP5651074B2 (en
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Shigeharu Ogawa
重治 小川
Takanori Nakane
孝典 中根
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Tsukishima Kikai Co Ltd
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Tsukishima Kikai Co Ltd
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  • Treatment Of Sludge (AREA)

Abstract

PROBLEM TO BE SOLVED: To surely supply a flocculant to a solid while preventing complication of an apparatus structure and damage of a flocculant supply pipe when the flocculant supply pipe is inserted in a screw conveyor from a side opposite to a side where the solid is transported.SOLUTION: In a centrifugal separator, a screw conveyor 2 which is rotated and driven coaxially with a rotary bowl 1 at a speed different from that of the rotary bowl 1 is provided inside the rotary bowl 1 which is rotated and driven around an axial line O. A matter to be treated P supplied to a space between the rotary bowl 1 and the screw conveyor 2 is subjected to solid-liquid separation by centrifugal force of the rotary bowl 1 and separated solid is transported by the screw conveyor 2 to one end side in an axial line O direction and is discharged. The flocculant supply pipe 7 for supplying the flocculant L is inserted into the screw shaft of the screw conveyor 2 from another end side in the axial line O direction and further a flocculant supply channel 8 for supplying the flocculant L supplied from the flocculant supply pipe 7 to the solid is formed at a screw shaft outer peripheral part so as to be extended to one end side in the axial line O direction.

Description

本発明は、軸線回りに回転駆動させられる回転ボウルの内部に差速をもって同軸に回転駆動させられるスクリュウコンベアが備えられた遠心分離機に関するものである。   The present invention relates to a centrifuge provided with a screw conveyor that is driven to rotate coaxially with a differential speed inside a rotating bowl that is driven to rotate about an axis.

このような遠心分離機として、例えば特許文献１、２には、円錐状の傾斜部および円筒部からなる回転筒（回転ボウル）と、この回転筒内に同心に配設されて異なる回転速度で回転するスクリュウコンベアとを備えたデカンタ型の遠心分離機を用いて、予め高分子凝集剤が添加されたり、回転筒の円筒部領域において高分子凝集剤が添加されたりした処理物としての汚泥に、さらに回転筒の傾斜部領域において無機凝集剤を供給することにより、固形分（脱水汚泥）の含水率の低減を図ることが提案されている。   As such a centrifugal separator, for example, in Patent Documents 1 and 2, a rotating cylinder (rotating bowl) composed of a conical inclined part and a cylindrical part and a concentric arrangement in the rotating cylinder are provided at different rotational speeds. Using a decanter-type centrifuge equipped with a rotating screw conveyor, the sludge as a treated product to which a polymer flocculant has been added in advance or a polymer flocculant has been added in the cylindrical region of the rotating cylinder Furthermore, it has been proposed to reduce the moisture content of the solid content (dehydrated sludge) by supplying an inorganic flocculant in the inclined region of the rotating cylinder.

特許第２５４０１９８号公報Japanese Patent No. 2540198 特公平６−４１０００号公報Japanese Patent Publication No. 6-41000

ところで、これら特許文献１、２に記載された遠心分離機では、処理物から固液分離された固形分を回転筒とスクリュウコンベアの回転軸線の方向の一端側に向けて搬送するのに合わせて、この軸線方向の一端側から無機凝集剤の供給管を処理物の供給管などと同軸に軸線に沿ってスクリュウコンベア内に挿入し、この凝集剤供給管から供給された無機凝集剤を、上記軸線に対する径方向に向けてスクリュウコンベアに穿設された供給穴から回転筒の傾斜部領域における固形分に供給するようにしている。   By the way, in the centrifuge described in these patent documents 1 and 2, according to conveying the solid content separated from the processed material toward one end side in the direction of the rotation axis of the rotary cylinder and the screw conveyor. The inorganic flocculant supply pipe is inserted into the screw conveyor along the axis coaxially with the processed material supply pipe from one end side in the axial direction, and the inorganic flocculant supplied from the flocculant supply pipe is It is made to supply to the solid content in the inclination part area | region of a rotating cylinder from the supply hole drilled in the screw conveyor toward the radial direction with respect to an axis.

しかしながら、このように固形分が搬送される軸線方向一端側から凝集剤供給管が挿入されるのとは逆に、反対の軸線方向他端側から凝集剤供給管をスクリュウコンベアに挿通して、固液分離された固形分に凝集剤を供給しようとすると、凝集剤供給管の長さが長くなってしまうため、遠心分離機の装置構造が複雑となるのは勿論、凝集剤供給管を軸線に沿って真直ぐ支持することが困難となり、高速で回転する回転ボウルやスクリュウコンベアの振動によって凝集剤供給管がスクリュウコンベアに接触して、場合によっては折損してしまうおそれがある。特に、凝集剤供給管が長くなるとその固有振動数は低くなるため、回転ボウルやスクリュウコンベアの回転による振動と共振して接触を生じ易くなるおそれがある。   However, contrary to the fact that the flocculant supply pipe is inserted from one end side in the axial direction in which the solid content is conveyed in this way, the flocculant supply pipe is inserted into the screw conveyor from the other axial end side, When trying to supply the flocculant to the solid component that has been solid-liquid separated, the length of the flocculant supply pipe becomes long, so that the structure of the centrifuge is complicated, and the flocculant supply pipe is connected to the axis. It is difficult to support the flocculant straight along the rotary bowl, and the flocculant supply pipe comes into contact with the screw conveyor due to the vibration of the rotating bowl or the screw conveyor rotating at high speed, which may be broken in some cases. In particular, the longer the flocculant supply pipe, the lower its natural frequency, and there is a risk that it will resonate with the vibration caused by the rotation of the rotating bowl or screw conveyor, and contact will easily occur.

本発明は、このような背景の下になされたもので、上述のように固形分が搬送される側とは反対側から凝集剤供給管をスクリュウコンベアに挿通する場合でも、装置構造の複雑化や供給管の損傷を生じたりすることなく、確実に凝集剤を固形分に供給することが可能な遠心分離機を提供することを目的としている。   The present invention has been made under such a background. Even when the flocculant supply pipe is inserted into the screw conveyor from the side opposite to the side on which the solid content is conveyed as described above, the structure of the apparatus is complicated. It is an object of the present invention to provide a centrifuge capable of reliably supplying a flocculant to a solid content without causing damage to a supply pipe.

上記課題を解決して、このような目的を達成するために、本発明は、軸線回りに回転駆動させられる回転ボウルの内部に、この回転ボウルと差速をもって同軸に回転駆動させられるスクリュウコンベアが備えられ、これら回転ボウルとスクリュウコンベアとの間の空間に供給された処理物を上記回転ボウルの遠心力によって固液分離しつつ、分離された固形分を上記スクリュウコンベアによって上記軸線方向一端側に搬送して排出する遠心分離機であって、上記スクリュウコンベアのスクリュウシャフトには、凝集剤が供給される凝集剤供給管が上記軸線方向他端側から挿通されているとともに、上記凝集剤供給管から供給された凝集剤を上記固形分に供給する凝集剤供給路が、上記スクリュウシャフトの外周部に上記軸線方向一端側に延びるように形成されていることを特徴とする。   In order to solve the above problems and achieve such an object, according to the present invention, a screw conveyor that is driven to rotate coaxially with a speed difference from the rotating bowl is provided inside a rotating bowl that is driven to rotate about an axis. The processed material supplied to the space between the rotating bowl and the screw conveyor is separated into solid and liquid by the centrifugal force of the rotating bowl, and the separated solid is moved to one end in the axial direction by the screw conveyor. A centrifuge for conveying and discharging, wherein a flocculant supply pipe to which a flocculant is supplied is inserted from a screw shaft of the screw conveyor from the other axial end side, and the flocculant supply pipe The flocculant supply path for supplying the flocculant supplied from the solid content to the solid content extends to one end side in the axial direction on the outer peripheral portion of the screw shaft. Characterized in that it is formed as.

このように構成された遠心分離機では、スクリュウコンベアのスクリュウシャフト自体に凝集剤供給路が形成されて凝集剤が軸線方向一端側に供給され、この一端側に搬送された固形分に供給されるので、凝集剤供給管を延長する必要がなく、装置構造の簡略化を図ることができるとともに、回転ボウルやスクリュウコンベアの振動や共振による接触などによって凝集剤供給管に損傷が生じるおそれがない。このため、確実に凝集剤を軸線方向一端側に搬送された固形分に供給することができ、従って長期に亙って安定的かつ効果的で円滑な処理物の遠心分離処理を図ることができる。   In the centrifuge configured in this way, a flocculant supply path is formed in the screw shaft itself of the screw conveyor, the flocculant is supplied to one end in the axial direction, and supplied to the solid content conveyed to this one end. Therefore, it is not necessary to extend the flocculant supply pipe, the apparatus structure can be simplified, and there is no possibility that the flocculant supply pipe is damaged due to contact by vibration or resonance of the rotating bowl or screw conveyor. For this reason, it is possible to reliably supply the flocculant to the solid content conveyed to one end side in the axial direction, and thus it is possible to achieve a stable, effective and smooth centrifugal separation of the processed material over a long period of time. .

ここで、このようにスクリュウコンベアのスクリュウシャフト外周部に軸線方向一端側に延びる凝集剤供給路を形成するには、例えばスクリュウシャフトの外周壁部に軸線方向に延びる長穴を形成して、その他端側を凝集剤供給管に連通させるとともに一端部をスクリュウシャフト外周面に開口させるようにすることも可能ではあるが、このような場合にはスクリュウシャフトの他端面から上記長穴を一端側に向けて穿設しなければならない。   Here, in order to form the flocculant supply path extending in the axial direction one end side in the screw shaft outer peripheral portion of the screw conveyor in this way, for example, an elongated hole extending in the axial direction is formed in the outer peripheral wall portion of the screw shaft. Although it is possible to connect the end side to the flocculant supply pipe and to open one end of the screw shaft on the outer peripheral surface of the screw shaft, in such a case, the elongated hole is connected to the one end side from the other end surface of the screw shaft. Must be drilled towards.

そこで、このような長穴を穿設することなく、凝集剤供給路を容易に形成するには、スクリュウコンベアのスクリュウシャフトの外周面に凹溝を軸線方向に形成し、この凹溝の他端側を凝集剤供給管に連通させるとともに、該凹溝の外周側は軸線方向一端部を除いて封止部材によって塞ぐようにすればよく、これにより、この一端部を固形分に凝集剤を供給する凝集剤供給口として凝集剤供給路を形成することができる。そして、このような凹溝の形成や封止部材による封止は、スクリュウシャフト外周側からの加工となるので、上述のような長穴を穿設するような場合と比べて、凝集剤供給路の形成が容易で時間や労力、コストの削減を図ることができる。   Therefore, in order to easily form the flocculant supply path without drilling such a long hole, a groove is formed in the axial direction on the outer peripheral surface of the screw shaft of the screw conveyor, and the other end of the groove is formed. The side of the groove is connected to the flocculant supply pipe, and the outer peripheral side of the groove may be closed by a sealing member except for one end in the axial direction. A flocculant supply path can be formed as the flocculant supply port. And since formation of such a ditch | groove and sealing by a sealing member becomes a process from the screw shaft outer peripheral side, compared with the case where the above long holes are drilled, it is a flocculant supply path. Can be easily formed, and time, labor, and cost can be reduced.

以上説明したように、本発明によれば、遠心分離機の装置構造の複雑化や凝集剤供給管の損傷を招いたりすることなく、回転ボウルの一端側に搬送される固形分に確実に凝集剤を供給して凝集させ、その含水率の効果的な低減を図ることができる。従って、例えば処理物が下水汚泥の場合には、排出された脱水汚泥を焼却するときに焼却設備における燃費の向上を図ることができる一方、埋め立て処分などで搬出するときには脱水汚泥を減量化することができるので、汚泥搬出の効率化と埋め立て処分地の延命化を図ることができる。   As described above, according to the present invention, the solid content conveyed to one end of the rotating bowl is reliably agglomerated without complicating the structure of the centrifuge and damaging the flocculant supply pipe. An agent can be supplied and agglomerated to effectively reduce the moisture content. Therefore, for example, when the treated material is sewage sludge, it is possible to improve the fuel efficiency of the incineration equipment when incinerating the discharged dewatered sludge, while reducing the amount of dewatered sludge when transported by landfill disposal. Therefore, it is possible to increase the efficiency of sludge removal and extend the life of landfill sites.

本発明の遠心分離機の一実施形態の概略を示す側断面図である。It is a sectional side view which shows the outline of one Embodiment of the centrifuge of this invention. 図１におけるＡＡ拡大断面図である。It is AA expanded sectional drawing in FIG.

図１および図２は、本発明の遠心分離機の一実施形態を示す概略図である。なお、以下に示す実施の形態の説明は、本質的な例示に過ぎず、本発明、その適用あるいはその用途を制限することを意図するものではない。本実施形態において、回転ボウル１は、軸線Ｏを中心とした円筒部１Ａと、この円筒部１Ａの軸線Ｏ方向一端側（図１において左側）に連設されて、この一端側に向かうに従い内径が小さくなる軸線Ｏを中心とした円錐状の傾斜部１Ｂと、円筒部１Ａの軸線Ｏ方向他端側（図１において右側）を閉塞する軸線Ｏに垂直な円環状の端板部１Ｃと、この端板部１Ｃの内周縁からさらに軸線Ｏ方向他端側に延びる円筒状のボウル軸部１Ｆとが一体に形成されて概略構成されている。このような回転ボウル１は、軸線Ｏが水平となるようにしてケーシングＣ内に収容され、図示されないベアリング等を介して該軸線Ｏ回りに回転自在に支持され、やはり図示されないボウル回転駆動手段がケーシングＣの外部に延伸させられた上記ボウル軸部１Ｆに連結されることによって軸線Ｏ回りに一方向に高速で回転可能とされる。   1 and 2 are schematic views showing an embodiment of the centrifuge of the present invention. Note that the following description of the embodiment is merely an exemplification, and is not intended to limit the present invention, its application, or its use. In the present embodiment, the rotating bowl 1 has a cylindrical portion 1A centered on the axis O, and is connected to one end side (left side in FIG. 1) of the cylindrical portion 1A in the axis O direction. A conical inclined portion 1B centering on an axis O with a small diameter, and an annular end plate portion 1C perpendicular to the axis O closing the other end side (right side in FIG. 1) of the cylindrical portion 1A in the axis O direction; A cylindrical bowl shaft portion 1F extending from the inner peripheral edge of the end plate portion 1C to the other end side in the direction of the axis O is integrally formed. Such a rotating bowl 1 is accommodated in the casing C so that the axis O is horizontal, and is supported rotatably around the axis O via a bearing (not shown). A bowl rotation driving means (not shown) is also provided. By being connected to the bowl shaft portion 1F extended to the outside of the casing C, it can be rotated around the axis O in one direction at a high speed.

この回転ボウル１の内部には、軸線Ｏを中心としてスクリュウコンベア２が収容されている。このスクリュウコンベア２は、スクリュウシャフトと図示されないスクリュウ羽根からなり、スクリュウシャフトは、回転ボウル１の上記ボウル軸部１Ｆの内周部に該ボウル軸部１Ｆに対して相対回転自在に挿通される円筒状のコンベア軸部２Ａと、このコンベア軸部２Ａの軸線Ｏ方向一端側に連設されて回転ボウル１の円筒部１Ａの内径よりも一回り小さな一定外径とされた中空の外形円柱状の直胴部２Ｂと、この直胴部２Ｂのさらに軸線Ｏ方向一端側に連設されて該一端側に向かうに従い外径が漸次小さくなる外形円錐状のコーン部２Ｃとからなる。このうち、直胴部２Ｂとコーン部２Ｃの外周に、上記スクリュウ羽根が設けられている。   Inside the rotating bowl 1, a screw conveyor 2 is accommodated around the axis O. The screw conveyor 2 includes a screw shaft and a screw blade (not shown). The screw shaft is inserted into the inner peripheral portion of the bowl shaft portion 1F of the rotating bowl 1 so as to be rotatable relative to the bowl shaft portion 1F. A hollow outer cylindrical shape that is connected to one end side in the axis O direction of the conveyor shaft portion 2A and has a constant outer diameter that is slightly smaller than the inner diameter of the cylindrical portion 1A of the rotating bowl 1 The straight body portion 2B and the cone portion 2C having a conical shape that is continuously provided on one end side in the axis O direction of the straight body portion 2B and gradually decreases in outer diameter toward the one end side. Among these, the screw blades are provided on the outer circumferences of the straight body portion 2B and the cone portion 2C.

このようなスクリュウコンベア２は、直胴部２Ｂ部分が回転ボウル１の上記円筒部１Ａ内周に位置するとともに、コーン部２Ｃが傾斜部１Ｂの内周に位置するように回転ボウル１内に収容されて、回転ボウル１と同様に図示されないベアリング等を介して該軸線Ｏ回りに回転自在に支持され、やはり図示されないコンベア回転駆動手段によって軸線Ｏ回りに回転ボウル１と同方向に差速をもって回転可能とされる。   Such a screw conveyor 2 is accommodated in the rotating bowl 1 so that the straight body portion 2B is located on the inner circumference of the cylindrical portion 1A of the rotating bowl 1 and the cone portion 2C is located on the inner circumference of the inclined portion 1B. As in the case of the rotating bowl 1, it is supported so as to be rotatable around the axis O via a bearing (not shown) or the like, and is rotated around the axis O with a differential speed in the same direction as the rotating bowl 1 by a conveyor rotation driving means (not shown). It is possible.

ここで、コーン部２Ｃの外径は、回転ボウル１の傾斜部１Ｂ内周との間に軸線Ｏに対する径方向の間隔があけられるように一回り小さくされ、さらにこの間隔は、回転ボウル１の円筒部１Ａ内周と直胴部２Ｂ外周との間の間隔より小さくされている。従って、このコーン部２Ｃの外径は、その軸線Ｏ方向の他端において直胴部２Ｂの外径よりも大きくされ、これによって直胴部２Ｂの軸線Ｏ方向一端側には、コーン部２Ｃとの間に、他端側を向いて軸線Ｏに対する径方向外周側に突出する凸壁部２Ｄが直胴部２Ｂの全周に亙って連続するように形成される。本実施形態では、この凸壁部２Ｄは、軸線Ｏに垂直に径方向外周側に突出するようにされている。   Here, the outer diameter of the cone portion 2 </ b> C is made slightly smaller so that a radial interval with respect to the axis O is provided between the inner periphery of the inclined portion 1 </ b> B of the rotating bowl 1, and this interval is further reduced. It is made smaller than the space | interval between the cylindrical part 1A inner periphery and the straight body part 2B outer periphery. Accordingly, the outer diameter of the cone portion 2C is made larger than the outer diameter of the straight barrel portion 2B at the other end in the axis O direction. In the meantime, the convex wall portion 2D that faces the other end side and projects radially outward with respect to the axis O is formed so as to be continuous over the entire circumference of the straight body portion 2B. In the present embodiment, the convex wall portion 2D protrudes to the outer peripheral side in the radial direction perpendicular to the axis O.

なお、これら直胴部２Ｂとコーン部２Ｃの外周に設けられる上記スクリュウ羽根の外径は、回転ボウル１の円筒部１Ａ内周と傾斜部１Ｂ内周との間に上記間隔よりも小さな隙間があけられる程度とされている。また、このスクリュウ羽根のピッチは、コーン部２Ｃにおけるピッチが直胴部２Ｂにおけるピッチよりも小さくなるようにされている。ピッチを小さくすることで、軸線Ｏ方向に対する処理物の移動距離が延び分離時間を確保することができる。さらに、コーン部２Ｃ外周面がなす円錐面の軸線Ｏに対する傾斜角は、回転ボウル１の傾斜部１Ｂ内周面がなす円錐面の軸線Ｏに対する傾斜角と等しいか大きくされ、従ってコーン部２Ｃ外周面と傾斜部１Ｂ内周面との上記間隔は、軸線Ｏ方向一端側に向けて一定か、漸次大きくなるようにされる。   The outer diameters of the screw blades provided on the outer circumferences of the straight body portion 2B and the cone portion 2C are smaller than the gap between the cylindrical portion 1A inner periphery and the inclined portion 1B inner periphery of the rotating bowl 1. It is said that it can be opened. The pitch of the screw blades is such that the pitch at the cone portion 2C is smaller than the pitch at the straight body portion 2B. By reducing the pitch, the moving distance of the processed material in the direction of the axis O is extended, and the separation time can be secured. Furthermore, the inclination angle with respect to the axis O of the conical surface formed by the outer peripheral surface of the cone portion 2C is made equal to or larger than the inclination angle with respect to the axis O of the conical surface formed by the inner peripheral surface of the inclined portion 1B of the rotating bowl 1, and accordingly the outer periphery of the cone portion 2C. The distance between the surface and the inner peripheral surface of the inclined portion 1B is constant or gradually increased toward one end side in the axis O direction.

また、直胴部２Ｂの中空部は、軸線Ｏ方向他端側の凝集剤供給室３と一端側の処理物供給室４とに隔壁５によって分けられている。ここで、この隔壁５には、スクリュウコンベア２のコンベア軸部２Ａの内周部と略等しい内径の円形の貫通穴５Ａが軸線Ｏを中心として形成されている。   The hollow portion of the straight body portion 2B is divided by a partition wall 5 into a flocculant supply chamber 3 on the other end side in the axis O direction and a processed material supply chamber 4 on one end side. Here, in this partition wall 5, a circular through hole 5 </ b> A having an inner diameter substantially equal to the inner peripheral portion of the conveyor shaft portion 2 </ b> A of the screw conveyor 2 is formed around the axis O.

さらに、コンベア軸部２Ａの内周部からこの貫通穴５Ａを通して処理物供給室４には、これら内周部および貫通穴５Ａの内径より僅かに小さな外径を有する円管状の処理物供給管６が、回転するスクリュウコンベア２に対して非回転に固定されて軸線Ｏに沿って挿通され、その一端側の開口部が処理物供給室４内に開口させられている。また、処理物供給室４から直胴部２Ｂの外周面にかけては軸線Ｏに対する径方向に貫通する処理物供給口４Ａが周方向に１ないし複数箇所に形成されている。   Further, a circular processed product supply pipe 6 having an outer diameter slightly smaller than the inner diameter of the inner peripheral portion and the through hole 5A is provided in the processed product supply chamber 4 from the inner peripheral portion of the conveyor shaft portion 2A through the through hole 5A. However, it is fixed to the rotating screw conveyor 2 in a non-rotating manner and is inserted along the axis O, and an opening on one end side thereof is opened in the workpiece supply chamber 4. Further, from the processed product supply chamber 4 to the outer peripheral surface of the straight body portion 2B, processed product supply ports 4A penetrating in the radial direction with respect to the axis O are formed in one or a plurality of locations in the circumferential direction.

さらにまた、この処理物供給管６内には、凝集剤供給管７が挿通されている。この凝集剤供給管７は処理物供給管６よりも内外径ともに十分小さくされた円管で、本実施形態では１本のこのような凝集剤供給管７が、処理物供給管６内の底面部に沿って軸線Ｏ方向他端側から一端側に凝集剤供給室３の位置まで挿通され、この底面部に溶接等により接合されて固定されている。   Furthermore, a flocculant supply pipe 7 is inserted into the processed product supply pipe 6. The flocculant supply pipe 7 is a circular pipe whose inner and outer diameters are sufficiently smaller than the processed product supply pipe 6. In this embodiment, one such flocculant supply pipe 7 is a bottom surface in the processed product supply pipe 6. The other end side from the other end side in the direction of the axis O is inserted to the position of the flocculant supply chamber 3 along the portion, and the bottom surface portion is joined and fixed by welding or the like.

また、軸線Ｏ方向において凝集剤供給室３に位置するこの凝集剤供給管７の一端部においては、その一端側を向く円管の開口部が閉塞されるとともに、処理物供給管６の底面部に対向する側面部には開口部が形成されている。一方、この凝集剤供給管７の開口部に対向する処理物供給管６の底面部にも開口部が形成されていて、これらの開口部はカバー７Ａ等により処理物供給管６内と隔絶されて連通させられており、これにより凝集剤供給管７の一端部が凝集剤供給室３に開口する凝集剤供給管開口部７Ｂが形成されている。   In addition, at one end portion of the flocculant supply pipe 7 positioned in the flocculant supply chamber 3 in the direction of the axis O, the opening of the circular pipe facing the one end side is closed, and the bottom surface portion of the processed product supply pipe 6 An opening is formed in the side surface facing the. On the other hand, an opening is also formed in the bottom surface of the processed product supply pipe 6 facing the opening of the flocculant supply pipe 7, and these openings are separated from the inside of the processed product supply pipe 6 by a cover 7A or the like. As a result, a flocculant supply pipe opening 7B is formed in which one end of the flocculant supply pipe 7 opens into the flocculant supply chamber 3.

さらに、凝集剤供給室３は、直胴部２Ｂの中空部の内壁（内周面）と隔壁５によって囲まれた空間であり、直胴部２Ｂの外周面との間に間隔をあけて軸線Ｏに直交する断面が円形をなすように形成されている。凝集剤供給室３を構成する隔壁５の貫通穴５Ａには、上記処理物供給管６が挿通されて上記凝集剤供給管開口部７Ｂが凝集剤供給室３内に位置するように設置される。また、凝集剤供給室３を構成する直胴部２Ｂの中空部の内壁には、周方向において上記処理物供給口４Ａの位置を避けるようにして１ないし複数箇所（例えば、４〜８箇所。本実施形態では図２に示すように周方向に等間隔に６箇所。）に凝集剤供給穴３Ａが、直胴部２Ｂの外周面にかけて貫通するように形成されている。   Further, the flocculant supply chamber 3 is a space surrounded by the inner wall (inner peripheral surface) of the hollow portion of the straight body portion 2B and the partition wall 5, and is spaced apart from the outer peripheral surface of the straight body portion 2B with an axis. The cross section perpendicular to O is formed in a circular shape. In the through hole 5A of the partition wall 5 constituting the flocculant supply chamber 3, the processed material supply pipe 6 is inserted so that the flocculant supply pipe opening 7B is positioned in the flocculant supply chamber 3. . In addition, the inner wall of the hollow portion of the straight body portion 2B constituting the flocculant supply chamber 3 has one or a plurality of locations (for example, 4 to 8 locations) so as to avoid the position of the processed product supply port 4A in the circumferential direction. In this embodiment, as shown in FIG. 2, the coagulant supply holes 3A are formed so as to penetrate through the outer peripheral surface of the straight body portion 2B at six locations at equal intervals in the circumferential direction.

そして、スクリュウコンベア２には、この凝集剤供給穴３Ａを介して上記凝集剤供給室３と連通するとともに軸線Ｏ方向一端側に延びる凝集剤供給路８が直胴部２Ｂに形成されている。本実施形態では、この凝集剤供給路８は、軸線Ｏ方向のスクリュウコンベア２の上記凸壁部２Ｄと上記処理物供給口４Ａとの間において軸線Ｏの外周方向に開口する凝集剤供給口８Ａを形成している。   In the screw conveyor 2, a flocculant supply path 8 that communicates with the flocculant supply chamber 3 through the flocculant supply hole 3A and extends to one end side in the axis O direction is formed in the straight body portion 2B. In the present embodiment, the flocculant supply path 8 has a flocculant supply port 8A that opens in the outer peripheral direction of the axis O between the convex wall portion 2D of the screw conveyor 2 in the axis O direction and the processed product supply port 4A. Is forming.

ここで、本実施形態では、直胴部２Ｂの外周面に、軸線Ｏ方向他端側が上記凝集剤供給穴３Ａにそれぞれ連通して軸線Ｏに平行に一端側に延びる凹溝８Ｂが凝集剤供給穴３Ａと同数形成されており、この凹溝８Ｂは、処理物供給口４Ａを周方向に避けつつ軸線Ｏ方向に越えて凸壁部２Ｄの手前にまで延びている。さらに、直胴部２Ｂの外周面には、この直胴部２Ｂ外周面と略等しい半径の断面円弧をなす長板状の封止部材８Ｃが、凹溝８Ｂの軸線Ｏ方向一端部を除いてその外周側開口部を塞ぐように接合されており、この封止部材８Ｃによって塞がれた凹溝８Ｂ部分が凝集剤供給路８とされ、塞がれずに直胴部２Ｂ外周面に開口した一端部が凝集剤供給口８Ａとされる。   Here, in the present embodiment, a groove 8B having the other end side in the direction of the axis O communicating with the flocculant supply hole 3A and extending to one end parallel to the axis O is provided on the outer peripheral surface of the straight body portion 2B. The same number of holes 3A as the number of the holes 3A are formed, and the recessed grooves 8B extend in the direction of the axis O to the front of the convex wall portion 2D while avoiding the workpiece supply port 4A in the circumferential direction. Further, on the outer peripheral surface of the straight body portion 2B, a long plate-like sealing member 8C having a cross-sectional arc having a radius substantially equal to the outer peripheral surface of the straight body portion 2B is provided except for one end portion in the axis O direction of the concave groove 8B. It is joined so as to close the outer peripheral side opening, and the concave groove 8B portion closed by the sealing member 8C is used as the flocculant supply path 8 and opens to the outer peripheral surface of the straight body portion 2B without being closed. One end portion is a flocculant supply port 8A.

なお、回転ボウル１の軸線Ｏ方向一端側には、処理物Ｐから固液分離されてスクリュウコンベア２によりこの一端側に搬送された固形分が傾斜部１Ｂとコーン部２Ｃとの上記間隙を通って排出される固形分排出口１Ｄが設けられて、ケーシングＣの軸線Ｏ方向一端側の処理物排出室Ｄに開口させられている。一方、本実施形態では、回転ボウル１の軸線Ｏ方向他端側の上記端板部１Ｃに、処理物Ｐから固液分離されて固形分の一端側への搬送とは逆に軸線Ｏ方向他端側に押し出される液分の液分排出路１Ｅが形成されて、ケーシングＣの軸線Ｏ方向他端側の液分排出室Ｅに開口させられている。なお、この液分排出路１Ｅは、スクリュウコンベア２のコンベア軸部２Ａに形成されていてもよい。   In addition, at one end side in the axis O direction of the rotating bowl 1, the solid content separated from the processed material P and conveyed to the one end side by the screw conveyor 2 passes through the gap between the inclined portion 1B and the cone portion 2C. The solid content discharge port 1 </ b> D is provided, and is opened to the processed product discharge chamber D on one end side in the axis O direction of the casing C. On the other hand, in the present embodiment, the end plate portion 1C on the other end side in the axis O direction of the rotating bowl 1 is separated from the processed material P by solid-liquid separation and opposite to the conveyance to the one end side of the solid content in the axis O direction and the like. A liquid discharge path 1E for the liquid pushed out to the end side is formed, and is opened to the liquid discharge chamber E on the other end side of the casing C in the axis O direction. The liquid discharge path 1E may be formed in the conveyor shaft portion 2A of the screw conveyor 2.

次に、このように構成された遠心分離機により、処理物Ｐとして例えば下水汚泥等の汚泥を固液分離する場合について説明する。処理物Ｐは、このような汚泥に予め高分子凝集剤と、必要に応じて無機凝集剤の一部が混合させられて、処理物供給管６を通して処理物供給室４に供給され、さらに処理物供給口４Ａから、差速をもって高速回転する回転ボウル１とスクリュウコンベア２の間の空間に供給される。   Next, the case where the sludge such as sewage sludge is solid-liquid separated as the processed material P by the centrifuge configured as described above will be described. The processed product P is prepared by mixing the sludge with a polymer flocculant and, if necessary, a part of the inorganic flocculant, and supplying the processed product P to the processed product supply chamber 4 through the processed product supply pipe 6. It is supplied from the object supply port 4A to the space between the rotary bowl 1 and the screw conveyor 2 that rotate at a high speed with a differential speed.

こうして回転ボウル１とスクリュウコンベア２の間の空間に供給された処理物Ｐは、回転ボウル１の遠心力によって固液分離されて、分離した固形分はスクリュウコンベア２のスクリュウ羽根によって軸線Ｏ方向一端側に搬送される。一方、処理物Ｐから固液分離された液分は、この固形分に押し出されるようにして上記空間を軸線Ｏ方向他端側に移動させられ、上記液分排出路１Ｅから排出される。   The processed material P thus supplied to the space between the rotating bowl 1 and the screw conveyor 2 is solid-liquid separated by the centrifugal force of the rotating bowl 1, and the separated solid content is one end in the axis O direction by the screw blades of the screw conveyor 2. Conveyed to the side. On the other hand, the liquid component separated from the processed material P is moved to the other end side in the direction of the axis O so as to be pushed out by the solid component, and discharged from the liquid discharge channel 1E.

ここで、本実施形態の遠心分離機では、スクリュウコンベア２の軸線Ｏ方向一端側に、コーン部２Ｃの外径が直胴部２Ｂの外径よりも大きくされることにより、軸線Ｏに対する径方向外周側に突出する凸壁部２Ｄが直胴部２Ｂの全周に亙って形成されており、この凸壁部２Ｄよりも一端側では固形分の流路が上記空間の径方向外周側に位置して狭められ、逆に凸壁部２Ｄの手前側（軸線Ｏ方向他端側）では固形分流路が軸線Ｏに対する径方向内周側に低くなっている。   Here, in the centrifuge of the present embodiment, the outer diameter of the cone part 2C is made larger than the outer diameter of the straight body part 2B on one end side in the axis O direction of the screw conveyor 2, so that the radial direction with respect to the axis O is increased. A convex wall portion 2D that protrudes to the outer peripheral side is formed over the entire circumference of the straight body portion 2B, and a solid flow path is located on the radially outer peripheral side of the space on one end side of the convex wall portion 2D. On the other hand, on the near side of the convex wall 2D (on the other end side in the direction of the axis O), the solid content flow path is lowered radially inward with respect to the axis O.

従って、回転ボウル１の一端側に搬送された固形分はこの凸壁部２Ｄの手前で滞留し、連続的に搬送されてくる固形分によって圧密させられてさらに分離させられ、その含水率が低減させられるとともに、凸壁部２Ｄ手前で滞留した固形分が固形分流路の低くなった径方向内周側に流れ込むことによって攪拌作用を生じる。ここで、この攪拌作用は、このように軸線Ｏ方向一端側に搬送される固形分がその流路の径方向内周側にも流れ込んで分散することによるものなので、単に回転ボウル１との差速によって固形分を搬送するためのスクリュウコンベア２のスクリュウ羽根の回転による攪拌や、例えばこのスクリュウコンベア２に取り付けた撹拌羽根による攪拌などよりも著しいものとなる。   Therefore, the solid content conveyed to one end side of the rotating bowl 1 stays in front of the convex wall portion 2D, and is consolidated and further separated by the solid content continuously conveyed, thereby reducing its moisture content. In addition, the solid content staying in front of the convex wall portion 2D flows into the radially inner peripheral side where the solid content flow path is lowered to produce a stirring action. Here, this stirring action is due to the solid content thus transported to one end side in the direction of the axis O flowing into the radial inner peripheral side of the flow path and being dispersed. Stirring by the rotation of the screw blades of the screw conveyor 2 for conveying the solid content at high speed, for example, stirring by the stirring blades attached to the screw conveyor 2, etc. is significant.

また、凸壁部２Ｄよりも一端側のコーン部２Ｃ外周と傾斜部１Ｂ内周との間に形成される固形分流路には、こうして圧密された径方向外周側の固形分が流れ込むが、この固形分流路が狭められているために固形分が凸壁部２Ｄの外周と回転ボウル１の内周との間を通過するときにも攪拌作用が生じる。さらに、コーン部２Ｃの外周と傾斜部１Ｂの内周との間の固形分流路は、一端側に向かうに従い径方向内周側に向かうように延びているためにその断面積は漸次小さくなるので、ここでも固形分は圧密されてさらに分離させられる。   Moreover, the solid content flow path formed between the outer periphery of the cone portion 2C and the inner periphery of the inclined portion 1B on the one end side relative to the convex wall portion 2D flows into the solid content flow path thus consolidated. Since the solid content flow path is narrowed, a stirring action also occurs when the solid content passes between the outer periphery of the convex wall portion 2D and the inner periphery of the rotating bowl 1. Furthermore, since the solid content flow path between the outer periphery of the cone portion 2C and the inner periphery of the inclined portion 1B extends toward the radially inner periphery as it goes toward one end, its cross-sectional area gradually decreases. Again, the solids are consolidated and further separated.

さらに、上記構成の遠心分離機では、この凸壁部２Ｄと上記処理物供給口４Ａとの間に凝集剤供給口８Ａが開口させられており、処理物Ｐとしての汚泥から回転ボウル１の回転による遠心力によって固液分離された固形分に対し、この凝集剤供給口８Ａから凝集剤Ｌとして無機凝集剤（処理物Ｐに予め無機凝集剤の一部が混合されている場合は残りの無機凝集剤）が供給される。   Further, in the centrifuge of the above configuration, the flocculant supply port 8A is opened between the convex wall portion 2D and the processed product supply port 4A, and the rotation of the rotary bowl 1 from the sludge as the processed product P is performed. The solid content separated by solid-liquid separation by the centrifugal force of the inorganic flocculant as the flocculant L from the flocculant supply port 8A (if the inorganic flocculant is partly mixed with the processed material P in advance, the remaining inorganic Flocculant) is supplied.

すなわち、処理物供給管６内に挿通された凝集剤供給管７に供給される凝集剤Ｌは、凝集剤供給管開口部７Ｂからスクリュウコンベア２内の凝集剤供給室３に流れ込み、スクリュウコンベア２の回転による遠心力によって軸線Ｏに対する径方向外周側に押圧されて凝集剤供給穴３Ａから凝集剤供給路８に流入する。さらに、こうして凝集剤供給路８に流入した凝集剤Ｌは、凝集剤供給管７から凝集剤供給室３に連続的に供給される凝集剤Ｌの押圧力によって凝集剤供給路８を軸線Ｏ方向一端側に押し出され、凝集剤供給口８Ａから、固形分の流路となる上記空間に供給される。   That is, the coagulant L supplied to the coagulant supply pipe 7 inserted into the processed product supply pipe 6 flows into the coagulant supply chamber 3 in the screw conveyor 2 from the coagulant supply pipe opening 7B, and the screw conveyor 2 Is pressed to the outer peripheral side in the radial direction with respect to the axis O by the centrifugal force caused by the rotation of, and flows into the coagulant supply path 8 from the coagulant supply hole 3A. Further, the coagulant L flowing into the coagulant supply path 8 in this way passes through the coagulant supply path 8 in the direction of the axis O by the pressing force of the coagulant L continuously supplied from the coagulant supply pipe 7 to the coagulant supply chamber 3. It is pushed out to one end side and supplied from the flocculant supply port 8A to the space serving as a solid content flow path.

従って、こうして供給された凝集剤Ｌは、上述した凸壁部２Ｄ手前の固形分の攪拌作用と、固形分が凸壁部２Ｄ外周と回転ボウル１内周との間を通過するときの攪拌作用とにより該固形分と十分に混合させられ、これによって固形分の凝集が効果的に促されて含水率がさらに低減させられる。このように、上記構成の遠心分離機によれば、直胴部２Ｂの凸壁部２Ｄによる固形分の圧密と凝集剤Ｌとの攪拌作用により、処理物Ｐから固液分離された固形分の含水率を大幅に低減することが可能となる。また、このように固形分の凝集が効果的に促されるため、固形分を所定の含水率まで低減するために要する凝集剤Ｌの使用量を削減することもできる。   Therefore, the flocculant L supplied in this way is the stirring action of the solid content before the convex wall portion 2D and the stirring action when the solid content passes between the outer periphery of the convex wall portion 2D and the inner periphery of the rotating bowl 1. And are sufficiently mixed with the solid content, thereby effectively promoting the aggregation of the solid content and further reducing the water content. Thus, according to the centrifuge of the above configuration, the solid content separated from the processed product P by solid-liquid separation by the solid content compaction by the convex wall portion 2D of the straight body portion 2B and the stirring action of the flocculant L. It becomes possible to significantly reduce the moisture content. Moreover, since aggregation of solid content is effectively promoted in this way, the amount of the coagulant L used for reducing the solid content to a predetermined moisture content can be reduced.

このため、処理物Ｐが上述した下水汚泥のような汚泥である場合に、上記遠心分離機から排出された固形分である脱水汚泥を焼却処理するときには、この脱水汚泥の含水率が低いために焼却設備における燃料の消費も少なく抑えて燃費の向上を図ることができる。また、こうして排出された脱水汚泥を埋め立て処分するときでも、脱水汚泥の減量化を図ることができるので、埋め立て処分地に搬出する際に一度でより多くの脱水汚泥を搬出することができて効率的であるとともに、処分地が埋め立て尽くされるまでの寿命を延長することができる。   For this reason, when the treated product P is sludge such as the sewage sludge described above, when the dewatered sludge, which is a solid content discharged from the centrifuge, is incinerated, the water content of the dewatered sludge is low. Fuel consumption can be improved by reducing fuel consumption in the incineration facility. In addition, even when the dewatered sludge discharged in this way is disposed of in landfill, the amount of dewatered sludge can be reduced, so that more dewatered sludge can be carried out at a time when it is transported to the landfill site. It is possible to extend the life until the disposal site is completely reclaimed.

そして、上記構成の遠心分離機では、このように凝集剤Ｌを軸線Ｏ方向一端側の凸壁部２Ｄ手前に開口した凝集剤供給口８Ａから固形分に供給するのに、凝集剤供給管７に凝集剤供給室３を介して連通する凝集剤供給路８を、スクリュウコンベア２のスクリュウシャフト外周部に上記軸線Ｏ方向一端側に延びるように形成しており、これによって遠心分離機の損傷や装置構造の複雑化を防いで、円滑かつ効果的な処理物Ｐの遠心分離処理を図ることができる。   In the centrifuge having the above-described configuration, the flocculant L is supplied to the solid content from the flocculant supply port 8A opened in front of the convex wall portion 2D on the one end side in the axis O direction. The flocculant supply passage 8 communicating with the flocculant supply chamber 3 is formed on the outer peripheral portion of the screw shaft of the screw conveyor 2 so as to extend to one end side in the axis O direction. The complicated structure of the apparatus can be prevented, and a smooth and effective centrifugal separation of the processed product P can be achieved.

すなわち、本実施形態のように回転ボウル１やスクリュウコンベア２の回転の軸線Ｏ方向の一端側に処理物Ｐから固液分離した固形分を搬送する遠心分離機において、軸線Ｏ方向の他端側から処理物供給管６と凝集剤供給管７とを挿通して、この他端側の直胴部２Ｂ外周面に処理物供給口４Ａを開口させるとともに、該処理物供給口４Ａとこれよりも一端側の凸壁部２Ｄとの間に凝集剤供給口８Ａを開口させる場合には、例えば本実施形態とは逆に凝集剤供給室３を処理物供給室４よりも軸線Ｏ方向一端側に形成しておいて、隔壁５の貫通穴５Ａを通して凝集剤供給管７を軸線Ｏに沿ってこの凝集剤供給室３まで延長して連通させ、この凝集剤供給室３から直胴部２Ｂの外周面に凝集剤供給口８Ａを直接開口させることも考えられる。   That is, in the centrifuge that conveys the solid content separated from the processed material P to one end in the direction of the axis O of the rotation of the rotating bowl 1 or the screw conveyor 2 as in this embodiment, the other end in the direction of the axis O The processed product supply pipe 6 and the flocculant supply pipe 7 are inserted from the other end side, and the processed product supply port 4A is opened on the outer peripheral surface of the straight barrel portion 2B on the other end side. In the case where the flocculant supply port 8A is opened between the convex wall portion 2D on the one end side, for example, the flocculant supply chamber 3 is placed closer to the one end side in the axis O direction than the processed product supply chamber 4 contrary to the present embodiment. The flocculant supply pipe 7 is extended along the axis O to the flocculant supply chamber 3 through the through hole 5A of the partition wall 5 and communicated with the outer periphery of the straight barrel portion 2B. It is also conceivable to directly open the flocculant supply port 8A on the surface.

しかしながら、そのような遠心分離機では、凝集剤供給管７の長さが長くなってしまうため、構造が複雑となるのは勿論、処理物供給管６よりも小径となるこの凝集剤供給管７を軸線Ｏに沿って真直ぐ支持し難くなり、高速で回転する回転ボウル１やスクリュウコンベア２の振動によって凝集剤供給管７が隔壁５の貫通穴５Ａに接触して場合によっては折損してしまうおそれがある。特に、凝集剤供給管７が長くなるとその固有振動数は低くなるため、回転ボウル１やスクリュウコンベア２の回転による振動と共振して接触を生じ易くなるおそれがある。   However, in such a centrifuge, since the length of the flocculant supply pipe 7 becomes long, the structure becomes complicated, and the flocculant supply pipe 7 having a smaller diameter than the processed product supply pipe 6 is used. Is difficult to support straight along the axis O, and the flocculant supply pipe 7 may come into contact with the through hole 5A of the partition wall 5 due to vibrations of the rotating bowl 1 and the screw conveyor 2 rotating at high speed, and may be broken in some cases. There is. In particular, when the flocculant supply pipe 7 becomes longer, the natural frequency thereof becomes lower, so that there is a possibility that the contact with the vibration due to the rotation of the rotating bowl 1 or the screw conveyor 2 is likely to occur.

ところが、そのような遠心分離機に対して、上記構成の遠心分離機では、上述のようにスクリュウコンベア２自体の外周部に凝集剤Ｌを軸線Ｏ方向の他端側から一端側に供給する凝集剤供給路８が形成されており、凝集剤供給管７を必要以上に長くすることなく、一端側の凸壁部２Ｄと処理物供給口４Ａとの間に凝集剤供給口８Ａを開口させることができる。このため、共振等による凝集剤供給管７と貫通穴５Ａとの接触のおそれもなく、凝集剤供給管７に折損等の損傷が生じるのも防ぐことができるとともに、装置構造の簡略化を図りつつも、確実に凝集剤Ｌを凸壁部２Ｄと処理物供給口４Ａとの間の固形分に供給することができ、従って長期に亙って安定的かつ効果的で円滑な処理物Ｐの遠心分離処理を図ることができる。   However, in contrast to such a centrifuge, in the centrifuge having the above-described configuration, the flocculant L is supplied to the outer peripheral portion of the screw conveyor 2 itself from the other end side in the axis O direction to the one end side as described above. The agent supply path 8 is formed, and the flocculant supply port 8A is opened between the convex wall portion 2D on one end side and the processed product supply port 4A without making the flocculant supply pipe 7 longer than necessary. Can do. For this reason, there is no fear of contact between the coagulant supply pipe 7 and the through hole 5A due to resonance or the like, and it is possible to prevent the coagulant supply pipe 7 from being damaged such as breakage, and to simplify the structure of the apparatus. However, it is possible to reliably supply the flocculant L to the solid content between the convex wall portion 2D and the processed product supply port 4A, and thus the stable, effective and smooth processed product P can be obtained over a long period of time. Centrifugation can be performed.

また、こうして凝集剤供給路８をスクリュウコンベア２に形成するには、例えば直胴部２Ｂの周壁部に軸線Ｏ方向に延びる長穴を形成して、その他端側を凝集剤供給室３に連通させるとともに一端部を直胴部２Ｂ外周面に開口させることも可能ではある。このような場合には直胴部２Ｂの他端面から上記長穴を凸壁部２Ｄと処理物供給口４Ａとの間まで穿設する必要がある。   In order to form the flocculant supply path 8 in the screw conveyor 2 in this way, for example, a long hole extending in the direction of the axis O is formed in the peripheral wall portion of the straight body portion 2B, and the other end communicates with the flocculant supply chamber 3. It is also possible to open one end of the straight body portion 2B on the outer peripheral surface. In such a case, it is necessary to drill the long hole from the other end surface of the straight body portion 2B to the space between the convex wall portion 2D and the workpiece supply port 4A.

ところが、これに対して本実施形態では、スクリュウコンベア２の直胴部２Ｂ外周面に凹溝８Ｂを軸線Ｏ方向に形成し、この凹溝８Ｂの他端側を凝集剤供給室３に凝集剤供給穴３Ａを介して連通させるとともに、該凹溝８Ｂの外周側は軸線Ｏ方向一端部を除いて封止部材８Ｃによって塞ぐことにより、この一端部を凝集剤供給口８Ａとする凝集剤供給路８を形成している。このため、上述のような長穴を穿設するような場合と比べて、凝集剤供給路８の形成が容易で時間や労力、コストの削減を図ることができる。   On the other hand, in the present embodiment, the groove 8B is formed in the axis O direction on the outer peripheral surface of the straight body 2B of the screw conveyor 2, and the other end side of the groove 8B is connected to the flocculant supply chamber 3 as the flocculant. While communicating with the supply hole 3A, the outer peripheral side of the concave groove 8B is closed with a sealing member 8C except for one end in the direction of the axis O, so that the one end is a flocculant supply port 8A. 8 is formed. For this reason, compared with the case where the above long holes are drilled, formation of the flocculant supply path 8 is easy, and time, labor, and cost can be reduced.

なお、スクリュコンベア２のスクリュウ羽根は、螺旋状の羽根をスクリュウシャフトの直胴部２Ｂやコーン部２Ｃの外周に直接取り付ける構造としてもよく、またスクリュウシャフトにブラケット等の取付部材を複数設け、この取付部材を介して螺旋状の羽根を取り付けるリボンスクリュウ構造を用いてもよい。   Note that the screw blades of the screw conveyor 2 may have a structure in which a spiral blade is directly attached to the outer periphery of the straight body portion 2B or cone portion 2C of the screw shaft, and a plurality of attachment members such as brackets are provided on the screw shaft. You may use the ribbon screw structure which attaches a spiral blade | wing via an attachment member.

さらに、本実施形態では、回転ボウル１の傾斜部１Ｂは、一端側に向けて内外径が漸次小さくなる円錐状とされて円筒部１Ａと一体に構成されるとともに、スクリュウコンベア２のコーン部２Ｃも、軸線Ｏ方向一端側に向かうに従い外径が漸次小さくなる外形円錐状とされて直胴部２Ｂと一体とされているが、これら傾斜部１Ｂとコーン部２Ｃは、傾斜部１Ｂ内周面とコーン部２Ｃ外周面との間の空間が、軸線Ｏ方向一端側に向けて少なくとも外周側に向かうことなく、軸線Ｏ側に近づく傾向となるように構成されていればよく、例えばこうして軸線Ｏ側に近づく傾斜の途中で軸線Ｏに平行な水平部が設けられていたり、軸線Ｏに対する傾斜の角度が変化していたりしてもよい。また、傾斜部１Ｂやコーン部２Ｃが円筒部１Ａや直胴部２Ｂに対して分割可能に取り付けられていてもよい。さらにまた、分離された固形分が、スクリュウコンベア２の直胴部２Ｂにおけるスクリュウ羽根の搬送力や、凸壁部２Ｄの手前で圧密状態となった該固形分に作用する遠心水頭圧によって固形分排出口１Ｄから排出可能な場合は、コーン部２Ｃ外周のスクリュウ羽根は省略することができる。   Furthermore, in the present embodiment, the inclined portion 1B of the rotating bowl 1 is formed into a conical shape whose inner and outer diameters gradually decrease toward one end side and is configured integrally with the cylindrical portion 1A, and the cone portion 2C of the screw conveyor 2 is formed. In addition, the outer diameter gradually decreases toward the one end side in the axis O direction and is formed into a conical shape with the straight body portion 2B. The inclined portion 1B and the cone portion 2C are formed on the inner peripheral surface of the inclined portion 1B. And the cone part 2C outer peripheral surface may be configured so as to tend toward the axis O side without going to the outer peripheral side at least toward the one end side in the axis O direction. A horizontal portion parallel to the axis O may be provided in the middle of the inclination approaching the side, or the inclination angle with respect to the axis O may be changed. Further, the inclined portion 1B and the cone portion 2C may be attached to the cylindrical portion 1A and the straight body portion 2B so as to be divided. Furthermore, the separated solid content is caused by the conveying force of the screw blades in the straight body portion 2B of the screw conveyor 2 or the centrifugal head pressure acting on the solid content that is in a compacted state before the convex wall portion 2D. When it is possible to discharge from the discharge port 1D, the screw blades on the outer periphery of the cone portion 2C can be omitted.

さらにまた、本実施形態では、上記凹溝８Ｂが図２に示すように断面「コ」字状とされて、封止部材８Ｃにより覆われた凝集剤供給路８が断面略方形状をなすように形成されているが、凹溝８Ｂを断面半円状やＵ字状、Ｖ字状などに形成して、その外周側を封止部材８Ｃにより覆うようにしてもよい。また、このような凹溝８Ｂを形成するのに代えて、あるいは凹溝８Ｂと併せて、断面「コ」字状や半円状、Ｕ字状、Ｖ字状等の長板状の封止部材８Ｃを直胴部２Ｂの外周面や凹溝８Ｂとの間に空間をあけて軸線Ｏ方向に延びるように接合し、その軸線Ｏ方向他端側の開口部を閉塞するとともにこの他端部内に凝集剤供給穴３Ａを連通させて、一端側の開口部を凝集剤供給口８Ａとする凝集剤供給路８を形成するようにしてもよい。   Furthermore, in this embodiment, the concave groove 8B has a “U” cross section as shown in FIG. 2, and the flocculant supply path 8 covered with the sealing member 8C has a substantially square cross section. However, the concave groove 8B may be formed in a semicircular cross section, a U shape, a V shape, or the like, and the outer peripheral side thereof may be covered with the sealing member 8C. Further, instead of forming the concave groove 8B, or in combination with the concave groove 8B, a long plate-shaped seal having a “U” shape, a semicircular shape, a U shape, a V shape, or the like is used. The member 8C is joined so as to extend in the direction of the axis O with a space between the outer peripheral surface of the straight body portion 2B and the concave groove 8B, and the opening on the other end side in the axis O direction is closed and the other end portion is closed. The flocculant supply hole 3 </ b> A may be communicated with the flocculant supply hole 8 </ b> A to form the flocculant supply path 8 having the opening on one end side as the flocculant supply port 8 </ b> A.

１ 回転ボウル
１Ａ 円筒部
１Ｂ 傾斜部
１Ｃ 端板部
２ スクリュウコンベア
２Ａ コンベア軸部
２Ｂ 直胴部
２Ｃ コーン部
２Ｄ 凸壁部
３ 凝集剤供給室
４ 処理物供給室
４Ａ 処理物供給口
５ 隔壁
６ 処理物供給管
７ 凝集剤供給管
８ 凝集剤供給路
８Ａ 凝集剤供給口
８Ｂ 凹溝
８Ｃ 封止部材
Ｏ 回転ボウル１およびスクリュウコンベア２の回転の軸線
Ｐ 処理物
Ｌ 凝集剤 DESCRIPTION OF SYMBOLS 1 Rotating bowl 1A Cylindrical part 1B Inclined part 1C End plate part 2 Screw conveyor 2A Conveyor shaft part 2B Straight trunk part 2C Cone part 2D Convex wall supply part 3 Coagulant supply chamber 4 Processed substance supply chamber 4A Processed substance supply port 5 Bulkhead 6 Process Material supply pipe 7 flocculant supply pipe 8 flocculant supply path 8A flocculant supply port 8B concave groove 8C sealing member O axis of rotation of rotating bowl 1 and screw conveyor 2 P processed material L flocculant

Claims (2)

軸線回りに回転駆動させられる回転ボウルの内部に、この回転ボウルと差速をもって同軸に回転駆動させられるスクリュウコンベアが備えられ、これら回転ボウルとスクリュウコンベアとの間の空間に供給された処理物を上記回転ボウルの遠心力によって固液分離しつつ、分離された固形分を上記スクリュウコンベアによって上記軸線方向一端側に搬送して排出する遠心分離機であって、上記スクリュウコンベアのスクリュウシャフトには、凝集剤が供給される凝集剤供給管が上記軸線方向他端側から挿通されているとともに、上記凝集剤供給管から供給された凝集剤を上記固形分に供給する凝集剤供給路が、上記スクリュウシャフトの外周部に上記軸線方向一端側に延びるように形成されていることを特徴とする遠心分離機。   A screw conveyor that is driven to rotate coaxially with a speed difference from the rotating bowl is provided inside a rotating bowl that is driven to rotate about an axis, and the processed material supplied to the space between the rotating bowl and the screw conveyor A centrifugal separator that carries out solid-liquid separation by centrifugal force of the rotating bowl and conveys and separates the separated solid content to the one end side in the axial direction by the screw conveyor, and the screw shaft of the screw conveyor includes: A flocculant supply pipe through which the flocculant is supplied is inserted from the other end in the axial direction, and a flocculant supply path for supplying the flocculant supplied from the flocculant supply pipe to the solid content is the screw. A centrifuge characterized by being formed on the outer peripheral portion of the shaft so as to extend toward one end in the axial direction. 上記スクリュウコンベアの上記スクリュウシャフトの外周面には凹溝が上記軸線方向に形成され、この凹溝の上記軸線方向他端側は上記凝集剤供給管に連通させられているとともに、該凹溝の外周側は上記軸線方向の一端部を除いて封止部材によって塞さがれて、上記凝集剤供給路が形成されていることを特徴とする請求項１に記載の遠心分離機。   A concave groove is formed in the axial direction on the outer peripheral surface of the screw shaft of the screw conveyor, and the other axial end of the concave groove is communicated with the flocculant supply pipe. The centrifuge according to claim 1, wherein the outer peripheral side is closed by a sealing member except for one end portion in the axial direction to form the flocculant supply path.
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Publication number Priority date Publication date Assignee Title
KR20170044641A (en) 2014-08-20 2017-04-25 도모에고교 가부시키가이샤 Decanter centrifuge and method for operating decanter centrifuge
US10525484B2 (en) 2014-08-20 2020-01-07 Tomoe Engineering Co., Ltd. Decanter centrifuge having a dilution solvent supply unit and method for operating a decanter centrifuge

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