JP4372934B2 - Basket-type centrifugal filtration device and centrifugal filtration method - Google Patents

Basket-type centrifugal filtration device and centrifugal filtration method Download PDF

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JP4372934B2
JP4372934B2 JP2000008483A JP2000008483A JP4372934B2 JP 4372934 B2 JP4372934 B2 JP 4372934B2 JP 2000008483 A JP2000008483 A JP 2000008483A JP 2000008483 A JP2000008483 A JP 2000008483A JP 4372934 B2 JP4372934 B2 JP 4372934B2
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chamber
rotating basket
basket
siphon
filtration
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JP2001198489A (en
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良一 宮坂
憲彦 池田
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Mitsubishi Kakoki Kaisha Ltd
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Mitsubishi Kakoki Kaisha Ltd
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【０００１】
【発明の属する技術分野】
本発明は、回転バスケットにより遠心濾過処理するバスケット型遠心濾過装置（以下単に遠心濾過装置という）及び遠心濾過方法に関する。
【０００２】
【従来の技術】
内周面にスクリ−ン部材を介して濾布が張設されて濾過室が形成された回転バスケットにより遠心濾過処理する遠心濾過装置においては、化学工業、薬品工業又は食品工業などの分野で多く使用されており、特に、サイホン構造の濾液排出機構を備えた遠心濾過装置においては、サイホン効果により濾過速度を大きくできると共に、濾過速度の調節も容易なため広く利用されている。
【０００３】
従来の遠心濾過装置を図３の説明図により説明する。内周面にスクリ−ン部材６を介して濾布７が張設されて濾過室１０が形成された回転バスケット１と、回転バスケット１を片持ちレバ−的に支持し、図示しない回転駆動手段に接続して回転バスケット１を回転させる回転軸１１と、回転バスケット１の濾液側と連通孔８で連通して設けられたサイホン室９と、サイホン室９内の濾液を吸引排出する浸漬深さ可変のサイホン管５と、回転バスケット１内に原液を供給する原液供給管２と、回転バスケット１内周面に形成されたケ−キを掻取る掻取ナイフ３と、掻取ナイフ３で掻取られたケ−キを排出する排出シュ−ト４が設けられている。
【０００４】
前記構成の遠心濾過装置では、回転駆動手段により高速回転された回転バスケット１の濾過室１０内に原液供給管２から原液が供給され、供給された原液は遠心力の作用で回転バスケット１内の半径方向に集液されて張設した濾布７で濾過処理され、濾液はスクリ−ン部材６を通過して連通孔８からサイホン室９内に滞留し、サイホン管５で吸引排出される。また、固形分は濾布上に沈降堆積されてケ−キ層が形成され、掻取ナイフ３で掻取られ排出シュ−ト４から排出される。
【０００５】
【発明が解決しようとする課題】
近年は遠心濾過装置により、遠心効果により浮上分と沈降分とに分級したり、また、浮上分、固形分及び濾液を夫々回収する要求が多くなってきている。例えば、ガラス充填剤スラリ−液から遠心効果によって浮上する中空状成分と、濾布上に沈降する破砕分や不純物を分離して夫々回収したり、また、タンパクスラリ−液から遠心効果によって浮上する油脂スカム、濾過された固形分の不純物、及び濾液の水溶性有効成分を夫々回収するなどがある。
しかし、従来の前記遠心濾過装置にあっては、サイホン室９のリム高さｈ2が濾過室１０のリム高さｈ1よりも低く設定されているため、処理される原液全体が濾過処理され、浮上分を区分して回収することができない。また、油脂などの浮上分の性状によっては、濾過すると濾布の目詰まりを惹起しやすい物質もあり、それら浮上分を別に回収する装置が望まれていた。
【０００６】
従って、本発明の遠心濾過装置は、浮上分、固形分及び濾液に区分して回収したり、また、浮上分と沈降分とに分級するのに最適な装置を提供することを目的として成されたものである。
【０００８】
【課題を解決するための手段】
前記目的を達成するための本発明の要旨は、請求項１に記載した発明においては、内周面にスクリ−ン部材を介して濾布が張設されて濾過室が形成された回転バスケットと、回転バスケットの濾液側と連通して設けられたサイホン室と、サイホン室内の濾液を吸引排出する浸漬深さ可変のサイホン管と、回転バスケット内に原液を供給する原液供給管と、回転バスケット内周面に形成されたケ−キを掻取る掻取ナイフと、掻取ナイフで掻取られたケ−キを排出する排出シュ−トを設けたバスケット型遠心濾過装置において、サイホン室のリム高さｈ2を濾過室のリム高さ以上とし、濾過室の滞留液を吸引排出する浸漬深さ可変のスキミング管を設けたことを特徴とするバスケット型遠心濾過装置である。
【０００９】
また、請求項２に記載した発明においては、内周面にスクリ−ン部材を介して濾布が張設されて濾過室が形成された回転バスケットと、回転バスケットの濾液側と連通し、リム高さが濾過室のリム高さ以上として設けられたサイホン室と、サイホン室内の濾液を吸引排出する浸漬深さ可変のサイホン管と、回転バスケット内に原液を供給する原液供給管と、回転バスケット内周面に形成されたケ−キを掻取る掻取ナイフと、掻取ナイフで掻取られたケ−キを排出する排出シュ−トを設けたバスケット型遠心濾過装置により遠心濾過する方法において、回転した回転バスケットの濾過室内に原液供給管から原液を供給し、濾過室の滞留液の少なくとも浮上分を掻取ナイフで掬い取って排出シュ−トから排出し、サイホン室内の濾液をサイホン管で吸引排出したのち、掻取ナイフで回転バスケット内周面に形成されたケ−キを掻取り排出シュ−トから排出することを特徴とする遠心濾過方法。
【００１０】
また、請求項３に記載した発明においては、内周面にスクリ−ン部材を介して濾布が張設されて濾過室が形成された回転バスケットと、回転バスケットの濾液側と連通し、リム高さが濾過室のリム高さ以上として設けられたサイホン室と、サイホン室内の濾液を吸引排出する浸漬深さ可変のサイホン管と、回転バスケット内に原液を供給する原液供給管と、回転バスケット内周面に形成されたケ−キを掻取る掻取ナイフと、掻取ナイフで掻取られたケ−キを排出する排出シュ−トと、濾過室の滞留液を吸引排出する浸漬深さ可変のスキミング管を設けたバスケット型遠心濾過装置により遠心濾過する方法において、回転した回転バスケットの濾過室内に原液供給管から原液を供給し、濾過室の滞留液の少なくとも浮上分をスキミング管で吸引排出し、サイホン室内の濾液をサイホン管で吸引排出したのち、掻取ナイフで回転バスケット内周面に形成されたケ−キを掻取り排出シュ−トから排出することを特徴とする遠心濾過方法である。
【００１１】
前記請求項２に記載した遠心濾過装置においては、サイホン室のリム高さｈ2を濾過室のリム高さｈ1以上にしたことにより、濾過室に供給された原液は一部濾過され、サイホン室に流入した濾液の液深で濾過室の原液が滞留し、原液は濾過室１０のリム高さｈ1近傍まで蓄積され、遠心効果により浮上分、固形分及び濾液に区分される。濾過室の滞留液の少なくとも浮上分を掻取ナイフで掬い取って排出シュ−トから排出し、所定の液深となったのちサイホン室内の濾液をサイホン管で吸引し、濾布よりも半径方向外側まで排出することにより回転バスケット内周面に形成されたケ−キが脱液される。脱液されたケ−キを掻取ナイフで掻取り、排出シュ−トから排出することにより、浮上分、固形分及び濾液に区分して回収したり、また、浮上分と沈降分とに分級することができる。
【００１２】
前記請求項１及び請求項３に記載した遠心濾過装置においては、サイホン室のリム高さｈ2を濾過室のリム高さｈ1以上にしたことにより、濾過室に供給された原液は一部濾過され、サイホン室に流入した濾液の液深で濾過室の原液が滞留し、原液は濾過室１０のリム高さｈ1近傍まで蓄積され、遠心効果により浮上分、固形分及び濾液に区分される。濾過室の滞留液の少なくとも浮上分をスキミング管で吸引排出し、所定の液深となったのちサイホン室内の濾液をサイホン管で吸引し、濾布よりも半径方向外側まで排出することにより回転バスケット内周面に形成されたケ−キが脱液される。脱液されたケ−キを掻取ナイフで掻取り、排出シュ−トから排出することにより、浮上分、固形分及び濾液に区分して回収したり、また、浮上分と沈降分とに分級することができる。
【００１３】
【発明の実施の形態】
以下に本発明の実施の形態について図面に基づいて説明する。図１及び図２は本発明の一実施の形態の遠心濾過装置における説明図であり、図３は従来の遠心濾過装置における説明図である。なお、全図において同一作用を有する部材については同一符番を用いた。
【００１４】
図１及び図２において、１は内周面にスクリ−ン部材６を介して濾布７が張設されて濾過室１０が形成された回転バスケットであり、回転軸１１により片持レバ−的に支持され、回転軸１１は図示しない回転駆動手段に接続して回転バスケット１を高速度で回転させる構成となっている。また、回転バスケット１の形状は、回転軸１１に接続する一端面が閉塞され、対向する他端面が開放された円筒状のバスケットであり、側内面に濾過孔１２が多数穿孔されたスクリ−ン部材６及びスクリ−ン部材６の内周面に濾布７が適宜な係止部材で張設されている。なお、回転バスケット１の回転駆動手段１１側と対向する開放面側は、開閉自在な蓋構造となっている。
【００１５】
３は回転バスケット１の開放面側から回転バスケット１内に挿設され、濾布上に沈降堆積されたケ−キ層を掻取る掻取ナイフであり、上下が開放されたボックス部３ｂの先端にナイフ部３ａが固着され、ボックス部３ｂに旋回駆動軸３ｃを介して図示しない旋回駆動手段に接続され、ナイフ部３ａの角度が調節されて掻取面への離接が行われる構造となっている。また、掻取ナイフ３のボックス部３ｂの下方開放部には掻取ケ−キを排出する排出シュ−ト４が連設されている。なお、２は回転バスケット１の開放面側から回転バスケット１内に挿設され、回転バスケット１内に原液を供給する原液供給管であり、先端部に原液を回転バスケット１の閉塞面に沿って供給する案内板を付設してもよい。
【００１６】
９は回転バスケット１の閉塞された一端面に濾液側と連通孔８で連通して設けられたサイホン室９であり、サイホン室９内の濾液を吸引排出する浸漬深さ可変のサイホン管５が付設されている。また、サイホン室９のリム高さｈ2は濾過室１０のリム高さｈ1と同一又はリム高さｈ1よりも高く設けられる。
【００１７】
１２は回転バスケット１の開放面側から回転バスケット１内に挿設され、濾過室１０内の滞留液を吸引排出する浸漬深さ可変のスキミング管である。なお、前記スキミング管１２は掻取ナイフ３で濾過室１０内の滞留液を吸引排出する構成の実施例では特に設ける必要はない。また、前記構成の遠心濾過装置では、濾布上に固形分が沈降堆積して形成されたケ−キ層を洗浄する洗浄液供給管や固着したケ−キ基礎層を剥離除去するガス噴射管などの付帯設備を適宜に設けることができる。
【００１８】
回転駆動手段により高速回転された回転バスケット１の濾過室１０内に原液供給管２から原液が供給され、供給された原液は遠心力の作用で回転バスケット１内の半径方向に集液されて張設した濾布７で濾過処理され、濾液はスクリ−ン部材６を通過して連通孔８からサイホン室９内に滞留し、サイホン管５で吸引排出される。また、固形分は濾布上に沈降堆積されてケ−キ層が形成され、掻取ナイフ３で掻取られ排出シュ−ト４から排出される。
【００１９】
次に前記構成の遠心濾過装置の作用について述べる。
原液を原液供給管２から高速回転する回転バスケット１の濾過室１０内に供給し、供給された原液は、遠心力の作用で回転バスケット１内の半径方向に集液され、一部の原液は回転バスケット１内周面に張設された濾布７で濾過処理され、濾液はスクリ−ン部材６を通過して連通孔８からサイホン室９内に滞留されるが、サイホン室９のリム高さｈ2が濾過室１０のリム高さｈ1以上に設けられているため、濾過室１０に供給された原液は、サイホン室９に流入した濾液の液深で濾過室１０の原液が滞留して濾過室１０のリム高さｈ1近傍まで蓄積され、遠心効果により浮上分、固形分及び濾液に区分される。
【００２０】
濾過室１０に滞留した原液の少なくとも浮上分をスキミング管１２で吸引排出するが、スキミング管１２を設けない実施例においては、浮上分を掻取ナイフで掬い取って排出シュ−トから排出する。浮上分を排出して濾過室１０内の原液が所定の液深となったのちサイホン室９内の濾液をサイホン管５で吸引し、濾布よりも半径方向外側まで排出する。これにより回転バスケット内周面に形成されたケ−キが脱液される。脱液されたケ−キは掻取ナイフ３で掻取り、排出シュ−ト４から排出することにより、浮上分、固形分及び濾液に区分して回収することができる。なお通常は、ケ−キの排出において、所定のケ−キが堆積した段階で回転速度を３０〜１００ｒｐｍ程度に低下させ、掻取ナイフ３によってケ−キ層を掻取るが、掻取ナイフ４で濾布３を損傷しないように、濾布側の薄いケ−キ層を残して掻取り排出する。
【００２１】
【発明の効果】
本発明の遠心濾過装置は、従来のバスケット型遠心濾過装置では不可能であった、浮上分、固形分及び濾液を夫々回収したり、また、浮上分と沈降分とに分級することができる最適な装置と方法である。
【図面の簡単な説明】
【図１】本発明の一実施の形態のバスケット型遠心濾過装置における説明図
【図２】本発明の一実施の形態のバスケット型遠心濾過装置における説明図
【図３】従来のバスケット型遠心濾過装置における説明図
【符号の説明】
１：回転バスケット
２：原液供給管
３：掻取ナイフ
３ａ：ナイフ部
３ｂ：ボックス部
３ｃ：旋回駆動軸
４：排出シュ−ト
５：サイホン管
６：スクリ−ン部材
７：濾布
８：連通孔
９：サイホン室
１０：濾過室
１１：回転駆動軸
１２：スキミング管[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a basket-type centrifugal filtration device (hereinafter simply referred to as a centrifugal filtration device) that performs centrifugal filtration with a rotating basket and a centrifugal filtration method.
[0002]
[Prior art]
Centrifugal filtration devices that perform centrifugal filtration with a rotating basket in which a filter cloth is formed by stretching a filter cloth on the inner peripheral surface via a screen member are often used in fields such as the chemical industry, the pharmaceutical industry, and the food industry. In particular, centrifugal filtration devices equipped with siphon-structured filtrate discharge mechanisms are widely used because the filtration rate can be increased by the siphon effect and the filtration rate can be easily adjusted.
[0003]
A conventional centrifugal filtration device will be described with reference to FIG. A rotating basket 1 in which a filter cloth 10 is formed by stretching a filter cloth 7 through a screen member 6 on an inner peripheral surface, and a rotating drive means (not shown) that supports the rotating basket 1 in a cantilevered manner. A rotating shaft 11 for rotating the rotating basket 1 connected to the horn, a siphon chamber 9 provided in communication with the filtrate side of the rotating basket 1 through the communication hole 8, and an immersion depth for sucking and discharging the filtrate in the siphon chamber 9 A variable siphon tube 5, a stock solution supply tube 2 that supplies the stock solution into the rotating basket 1, a scraping knife 3 that scrapes the cake formed on the inner peripheral surface of the rotating basket 1, and a scraping knife 3 A discharge shunt 4 for discharging the taken cake is provided.
[0004]
In the centrifugal filtration device having the above-described configuration, the stock solution is supplied from the stock solution supply pipe 2 into the filtration chamber 10 of the rotating basket 1 rotated at high speed by the rotation driving means, and the supplied stock solution is contained in the rotating basket 1 by the action of centrifugal force. The filtered liquid 7 collected in the radial direction is filtered, and the filtrate passes through the screen member 6, stays in the siphon chamber 9 through the communication hole 8, and is sucked and discharged through the siphon tube 5. Further, the solid content is settled and deposited on the filter cloth to form a cake layer, which is scraped by the scraping knife 3 and discharged from the discharge shunt 4.
[0005]
[Problems to be solved by the invention]
In recent years, there has been an increasing demand for centrifugal filtration devices to classify a floating component and a sediment component by a centrifugal effect, and to collect a floating component, a solid component, and a filtrate, respectively. For example, the hollow component that floats from the glass filler slurry by centrifugal effect and the crushed components and impurities that settle on the filter cloth are separated and recovered, respectively, or float from the protein slurry by centrifugal effect. For example, oil and fat scum, impurities of solid matter filtered, and water-soluble active ingredients of the filtrate are recovered.
However, in the conventional centrifugal filtration device, since the rim height h2 of the siphon chamber 9 is set lower than the rim height h1 of the filtration chamber 10, the whole stock solution to be treated is filtered and floated. The minutes cannot be collected separately. In addition, depending on the properties of the floating parts such as fats and oils, there are substances that easily cause clogging of the filter cloth when filtered, and an apparatus for separately collecting these floating parts has been desired.
[0006]
Therefore, the centrifugal filtration device of the present invention is formed for the purpose of providing an optimum device for collecting and classifying into a floating component, a solid component and a filtrate, and classifying into a floating component and a sediment component. It is a thing.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the gist of the present invention is that, in the invention described in claim 1 , a rotating basket in which a filter cloth is formed by stretching a filter cloth on an inner peripheral surface via a screen member; A siphon chamber provided in communication with the filtrate side of the rotating basket, a siphon tube having a variable immersion depth for sucking and discharging the filtrate in the siphon chamber, a stock solution supply pipe for supplying the stock solution into the rotating basket, and a rotating basket In a basket type centrifugal filtration device provided with a scraping knife for scraping a cake formed on a peripheral surface and a discharge shunt for discharging the cake scraped by the scraping knife, the rim height of the siphon chamber The basket-type centrifugal filtration device is characterized in that a skimming tube having a variable immersion depth for sucking and discharging the staying liquid in the filtration chamber is provided so that the length h2 is not less than the rim height of the filtration chamber.
[0009]
According to a second aspect of the present invention, there is provided a rotating basket in which a filter cloth is formed by stretching a filter cloth on the inner peripheral surface via a screen member, and communicates with the filtrate side of the rotating basket. A siphon chamber having a height equal to or higher than the rim height of the filtration chamber, a siphon tube having a variable immersion depth for sucking and discharging filtrate in the siphon chamber, a stock solution supply tube for supplying the stock solution into the rotating basket, and a rotating basket In a method of centrifugal filtration by a basket type centrifugal filtration device provided with a scraping knife for scraping the cake formed on the inner peripheral surface and a discharge shunt for discharging the cake scraped by the scraping knife The stock solution is supplied from the stock solution supply pipe into the filtration chamber of the rotating rotating basket, and at least the floating part of the staying liquid in the filtration chamber is scooped with a scraping knife and discharged from the discharge shunt. The filtrate in the siphon chamber is removed from the siphon tube. After sucking and discharging, Quai formed rotating basket inner peripheral surface with scraping knives - key the scraping discharge shoe - centrifugal filtration method characterized by discharging from bets.
[0010]
According to a third aspect of the present invention, there is provided a rotating basket in which a filter cloth is formed by stretching a filter cloth on the inner peripheral surface via a screen member, and communicates with the filtrate side of the rotating basket. A siphon chamber having a height equal to or higher than the rim height of the filtration chamber, a siphon tube having a variable immersion depth for sucking and discharging filtrate in the siphon chamber, a stock solution supply tube for supplying the stock solution into the rotating basket, and a rotating basket A scraping knife for scraping the cake formed on the inner peripheral surface, a discharge shunt for discharging the cake scraped by the scraping knife, and a soaking depth for sucking and discharging the staying liquid in the filtration chamber In the method of centrifugal filtration using a basket-type centrifugal filtration device equipped with a variable skimming tube, the stock solution is supplied from the stock solution supply tube into the filtration chamber of the rotating rotating basket, and at least the floating portion of the staying liquid in the filtration chamber is sucked by the skimming tube. The centrifugal filtration method is characterized in that after the filtrate in the siphon chamber is sucked and discharged with a siphon tube, the cake formed on the inner peripheral surface of the rotating basket is scraped with a scraping knife and discharged from the discharge shunt. is there.
[0011]
In the centrifugal filtration device according to the second aspect , since the rim height h2 of the siphon chamber is set to be equal to or higher than the rim height h1 of the filtration chamber, the stock solution supplied to the filtration chamber is partially filtered, The stock solution in the filtration chamber stays at the depth of the filtrate that has flowed in. The stock solution is accumulated up to the vicinity of the rim height h1 of the filtration chamber 10, and is divided into a floating portion, a solid content, and a filtrate by the centrifugal effect. Scattering at least the floating part of the accumulated liquid in the filtration chamber with a scraping knife and discharging it from the discharge shunt. After reaching the specified liquid depth, the filtrate in the siphon chamber is sucked with the siphon tube, and is more radial than the filter cloth. By discharging to the outside, the cake formed on the inner peripheral surface of the rotating basket is drained. The drained cake is scraped with a scraping knife and discharged from the discharge shunt to be separated into a floating part, a solid part and a filtrate, and classified into a floating part and a sediment part. can do.
[0012]
In the centrifugal filtration device according to the first and third aspects, the stock solution supplied to the filtration chamber is partially filtered by setting the rim height h2 of the siphon chamber to be higher than the rim height h1 of the filtration chamber. The stock solution in the filtration chamber stays at the depth of the filtrate flowing into the siphon chamber. The stock solution is accumulated up to the vicinity of the rim height h1 of the filtration chamber 10 and is divided into a floating portion, a solid content and a filtrate by the centrifugal effect. At least the floating part of the accumulated liquid in the filtration chamber is sucked and discharged with a skimming tube. After reaching a predetermined depth, the filtrate in the siphon chamber is sucked with the siphon tube and discharged to the outside in the radial direction from the filter cloth. The cake formed on the inner peripheral surface is drained. The drained cake is scraped with a scraping knife and discharged from the discharge shunt to be separated into a floating part, a solid part and a filtrate, and classified into a floating part and a sediment part. can do.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are explanatory views of a centrifugal filtration device according to an embodiment of the present invention, and FIG. 3 is an explanatory view of a conventional centrifugal filtration device. In addition, the same number was used about the member which has the same effect | action in all the figures.
[0014]
In FIGS. 1 and 2, reference numeral 1 denotes a rotating basket in which a filter cloth 7 is stretched on an inner peripheral surface via a screen member 6 to form a filtration chamber 10. A rotating shaft 11 can be used as a cantilever lever. The rotating shaft 11 is connected to a rotation driving means (not shown) to rotate the rotating basket 1 at a high speed. The shape of the rotating basket 1 is a cylindrical basket in which one end face connected to the rotating shaft 11 is closed and the other opposite end face is opened, and a screen having a large number of filtration holes 12 in the side inner face. A filter cloth 7 is stretched on the inner peripheral surfaces of the member 6 and the screen member 6 with an appropriate locking member. In addition, the open surface side facing the rotation drive means 11 side of the rotating basket 1 has a lid structure that can be freely opened and closed.
[0015]
3 is a scraping knife which is inserted into the rotating basket 1 from the open surface side of the rotating basket 1 and scrapes the cake layer deposited and deposited on the filter cloth. The tip of the box portion 3b whose top and bottom are opened The knife portion 3a is fixed to the box portion 3b and connected to the box portion 3b via a turning drive shaft 3c to a turning drive means (not shown), and the angle of the knife portion 3a is adjusted so as to be detached from the scraping surface. ing. Further, a discharge shunt 4 for discharging the scraping cake is connected to the lower open portion of the box portion 3 b of the scraping knife 3. Reference numeral 2 denotes a stock solution supply pipe that is inserted into the rotating basket 1 from the open surface side of the rotating basket 1 and supplies the stock solution into the rotating basket 1. The stock solution is fed to the tip of the stock solution along the closed surface of the rotating basket 1. You may attach the guide plate to supply.
[0016]
Reference numeral 9 denotes a siphon chamber 9 provided on one end face of the rotating basket 1 connected to the filtrate side through a communication hole 8. A siphon tube 5 having a variable immersion depth for sucking and discharging the filtrate in the siphon chamber 9 is provided. It is attached. The rim height h2 of the siphon chamber 9 is set to be equal to or higher than the rim height h1 of the filtration chamber 10.
[0017]
Reference numeral 12 denotes a skimming tube having a variable immersion depth that is inserted into the rotating basket 1 from the open surface side of the rotating basket 1 and sucks and discharges the accumulated liquid in the filtration chamber 10. The skimming tube 12 is not particularly necessary in the embodiment in which the staying liquid in the filtration chamber 10 is sucked and discharged by the scraping knife 3. Further, in the centrifugal filtration device having the above-described configuration, a cleaning liquid supply pipe for cleaning the cake layer formed by solid deposition on the filter cloth, a gas injection pipe for peeling and removing the fixed cake base layer, etc. These incidental facilities can be provided as appropriate.
[0018]
The stock solution is supplied from the stock solution supply pipe 2 into the filtration chamber 10 of the rotating basket 1 rotated at a high speed by the rotation driving means, and the supplied stock solution is collected in the radial direction in the rotating basket 1 by the action of centrifugal force. The filtrate is filtered by the provided filter cloth 7, the filtrate passes through the screen member 6, stays in the siphon chamber 9 through the communication hole 8, and is sucked and discharged through the siphon tube 5. Further, the solid content is settled and deposited on the filter cloth to form a cake layer, which is scraped by the scraping knife 3 and discharged from the discharge shunt 4.
[0019]
Next, the operation of the centrifugal filtration device having the above configuration will be described.
The stock solution is supplied from the stock solution supply pipe 2 into the filtration chamber 10 of the rotating basket 1 that rotates at high speed, and the supplied stock solution is collected in the radial direction in the rotating basket 1 by the action of centrifugal force. Filtration is performed with a filter cloth 7 stretched on the inner peripheral surface of the rotating basket 1, and the filtrate passes through the screen member 6 and stays in the siphon chamber 9 through the communication hole 8. Since the length h2 is provided at the rim height h1 or more of the filtration chamber 10, the stock solution supplied to the filtration chamber 10 is filtered because the stock solution in the filtration chamber 10 stays at the depth of the filtrate flowing into the siphon chamber 9. The chamber 10 is accumulated up to the vicinity of the rim height h1, and is divided into a floating part, a solid part and a filtrate by a centrifugal effect.
[0020]
At least the floating portion of the stock solution staying in the filtration chamber 10 is sucked and discharged by the skimming tube 12, but in the embodiment in which the skimming tube 12 is not provided, the floating portion is scooped with a scraping knife and discharged from the discharge shunt. After the floating portion is discharged and the stock solution in the filtration chamber 10 reaches a predetermined depth, the filtrate in the siphon chamber 9 is sucked by the siphon tube 5 and discharged to the outside in the radial direction from the filter cloth. As a result, the cake formed on the inner peripheral surface of the rotating basket is drained. The drained cake is scraped with the scraping knife 3 and discharged from the discharge shunt 4 so that it can be recovered by being separated into a floating portion, a solid content and a filtrate. Normally, in discharging the cake, when the predetermined cake is deposited, the rotational speed is reduced to about 30 to 100 rpm, and the cake layer is scraped off by the scraping knife 3. In order to avoid damaging the filter cloth 3, the filter cloth 3 is scraped and discharged leaving a thin cake layer on the filter cloth side.
[0021]
【The invention's effect】
The centrifugal filtration device of the present invention can recover the floating portion, the solid content and the filtrate, which are impossible with the conventional basket type centrifugal filtration device, and can be classified into the floating portion and the sedimented portion. Device and method.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a basket type centrifugal filtration device according to an embodiment of the present invention. FIG. 2 is an explanatory view of a basket type centrifugal filtration device of an embodiment of the present invention. Schematic diagram of equipment [Explanation of symbols]
1: rotating basket 2: stock solution supply pipe 3: scraping knife 3a: knife part 3b: box part 3c: turning drive shaft 4: discharge shunt 5: siphon pipe 6: screen member 7: filter cloth 8: communication Hole 9: Siphon chamber 10: Filtration chamber 11: Rotary drive shaft 12: Skimming tube

Claims (3)

内周面にスクリ−ン部材を介して濾布が張設されて濾過室が形成された回転バスケットと、回転バスケットの濾液側と連通して設けられたサイホン室と、サイホン室内の濾液を吸引排出する浸漬深さ可変のサイホン管と、回転バスケット内に原液を供給する原液供給管と、回転バスケット内周面に形成されたケ−キを掻取る掻取ナイフと、掻取ナイフで掻取られたケ−キを排出する排出シュ−トを設けたバスケット型遠心濾過装置において、サイホン室のリム高さｈ2を濾過室のリム高さｈ1以上とし、濾過室の滞留液を吸引排出する浸漬深さ可変のスキミング管を設けたことを特徴とするバスケット型遠心濾過装置。A rotating basket in which a filter cloth is stretched through a screen member on the inner peripheral surface to form a filtration chamber, a siphon chamber provided in communication with the filtrate side of the rotating basket, and the filtrate in the siphon chamber are sucked A siphon tube with variable immersion depth to be discharged, a stock solution supply tube for supplying stock solution into the rotating basket, a scraping knife for scraping the cake formed on the inner peripheral surface of the rotating basket, and scraping with a scraping knife In a basket-type centrifugal filtration device provided with a discharge shout for discharging the cake, the rim height h2 of the siphon chamber is set to be higher than the rim height h1 of the filtration chamber, and the staying liquid in the filtration chamber is sucked and discharged. A basket-type centrifugal filtration device comprising a depth-variable skimming tube. 内周面にスクリ−ン部材を介して濾布が張設されて濾過室が形成された回転バスケットと、回転バスケットの濾液側と連通し、リム高さが濾過室のリム高さ以上として設けられたサイホン室と、サイホン室内の濾液を吸引排出する浸漬深さ可変のサイホン管と、回転バスケット内に原液を供給する原液供給管と、回転バスケット内周面に形成されたケ−キを掻取る掻取ナイフと、掻取ナイフで掻取られたケ−キを排出する排出シュ−トを設けたバスケット型遠心濾過装置により遠心濾過する方法において、回転した回転バスケットの濾過室内に原液供給管から原液を供給し、濾過室の滞留液の少なくとも浮上分を掻取ナイフで掬い取って排出シュ−トから排出し、サイホン室内の濾液をサイホン管で吸引排出したのち、掻取ナイフで回転バスケット内周面に形成されたケ−キを掻取り排出シュ−トから排出することを特徴とする遠心濾過方法。A rotating basket in which a filter cloth is stretched on the inner peripheral surface via a screen member to form a filtration chamber and a filtrate side of the rotating basket communicate with each other, and the rim height is set to be higher than the rim height of the filtration chamber. Scratching the cake formed on the inner peripheral surface of the rotating basket, the siphon tube with a variable immersion depth for sucking and discharging the filtrate in the siphon chamber, the undiluted solution supplying tube for supplying the undiluted solution into the rotating basket, and the rotating basket. In a method of centrifugal filtration by a basket-type centrifugal filtration device provided with a scraping knife to be taken and a discharge shout for discharging the cake scraped by the scraping knife, a stock solution supply pipe is provided in the filtration chamber of the rotated rotating basket. The undiluted liquid is supplied from the filter chamber, and at least the floating part of the accumulated liquid in the filtration chamber is scooped with a scraping knife and discharged from the discharge shunt. The filtrate in the siphon chamber is sucked and discharged with a siphon tube, and then rotated with a scraping knife. Tsu Ke formed preparative inner peripheral surface - key the scraping discharge shoe - centrifugal filtration method characterized by discharging from bets. 内周面にスクリ−ン部材を介して濾布が張設されて濾過室が形成された回転バスケットと、回転バスケットの濾液側と連通し、リム高さが濾過室のリム高さ以上として設けられたサイホン室と、サイホン室内の濾液を吸引排出する浸漬深さ可変のサイホン管と、回転バスケット内に原液を供給する原液供給管と、回転バスケット内周面に形成されたケ−キを掻取る掻取ナイフと、掻取ナイフで掻取られたケ−キを排出する排出シュ−トと、濾過室の滞留液を吸引排出する浸漬深さ可変のスキミング管を設けたバスケット型遠心濾過装置により遠心濾過する方法において、回転した回転バスケットの濾過室内に原液供給管から原液を供給し、濾過室の滞留液の少なくとも浮上分をスキミング管で吸引排出し、サイホン室内の濾液をサイホン管で吸引排出したのち、掻取ナイフで回転バスケット内周面に形成されたケ−キを掻取り排出シュ−トから排出することを特徴とする遠心濾過方法。A rotating basket in which a filter cloth is stretched on the inner peripheral surface via a screen member to form a filtration chamber and a filtrate side of the rotating basket communicate with each other, and the rim height is set to be higher than the rim height of the filtration chamber. Scratching the cake formed on the inner peripheral surface of the rotating basket, the siphon tube with a variable immersion depth for sucking and discharging the filtrate in the siphon chamber, the undiluted solution supplying tube for supplying the undiluted solution into the rotating basket, and the rotating basket. Basket type centrifugal filtration apparatus provided with a scraping knife to be taken out, a discharge shout for discharging the cake scraped by the scraping knife, and a skimming tube of variable immersion depth for sucking and discharging the staying liquid in the filtration chamber In the method of centrifugal filtration, the stock solution is supplied from the stock solution supply pipe into the filtration chamber of the rotating rotating basket, and at least the floating portion of the staying liquid in the filtration chamber is sucked and discharged by the skimming tube, and the filtrate in the siphon chamber is sent by the siphon tube. After out 引排, Quai formed rotating basket inner peripheral surface with scraping knives - key the scraping discharge shoe - centrifugal filtration method characterized by discharging from bets.
JP2000008483A 2000-01-18 2000-01-18 Basket-type centrifugal filtration device and centrifugal filtration method Expired - Fee Related JP4372934B2 (en)

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