JP4410483B2 - Stir and mix pump - Google Patents

Stir and mix pump Download PDF

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Publication number
JP4410483B2
JP4410483B2 JP2003119834A JP2003119834A JP4410483B2 JP 4410483 B2 JP4410483 B2 JP 4410483B2 JP 2003119834 A JP2003119834 A JP 2003119834A JP 2003119834 A JP2003119834 A JP 2003119834A JP 4410483 B2 JP4410483 B2 JP 4410483B2
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Japan
Prior art keywords
pump
stirring
mixing
mixed
spiral
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JP2004324519A (en
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由和 小林
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Miike Tekkou KK
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Miike Tekkou KK
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Description

【0001】
【発明の属する技術分野】
この発明は、液体とプラスチック細片等とを混合した混合流を、処理装置に供給するに先だって、予め混合して供給するための撹拌混合ポンプに関する。
【0002】
【従来の技術】
プラスチックは、現代の生活に広範囲に使用されており、色々な分野から大量に廃棄されている。特に、近年、各種のスポーツドリンクやミネラルウオータ、お茶が自動販売機で販売され、毎年増え続けており、コンビニエンス・ストアーでも販売されるに及んで大量の使用済みペットボトルが廃棄されるようになっている。それらプラスチックは、再生繊維の製造や、再生プラスチック化や油化のために、プラスチックの種類に応じて精度良く分離することが待望されている。
【0003】
プラスチック片の分離法には、比重分離法があるが、精度良く各種のプラスチックを分離するには、例えば、5〜30mm程度に粉砕されたプラスチック細片を比重液体と良く混合する必要があり、従来から、内部に撹拌羽根を備えた混合撹拌タンクをポンプの前に設けていた。
【0004】
【発明が解決しようとする課題】
混合撹拌タンクをポンプの前段階に別に設けると、混合攪拌タンクには比較的大きな設置場所とポンプまでの配管が必要とされ、また、撹拌羽根の回転駆動モータも別に設ける必要があった。また、ポンプまでの距離が長いと液体に対する混合物の密度に偏差を生じる傾向があった。
【0005】
本発明は、前記に鑑みて案出されたものであって、混合装置の占有するスペースの軽減に優れ、配管を省略でき、撹拌混合能力の高い固形片の撹拌混合ポンプを提供することを目的としている。
【0006】
【課題を解決するための手段】
本発明の撹拌混合ポンプは、渦巻ポンプ本体の吸入口側に混合攪拌用の撹拌羽根をポンプ軸に直結して内装したケーシングを設けて、混合流の固形片と液体とをケーシング内で予め攪拌混合して、直ちに、渦巻ポンプ本体に吸引して、次いで送出する。
【0007】
本発明は、撹拌混合する撹拌羽根がポンプ回転軸によって直接に回転駆動されて、固形片と液体から成る混合流がケーシング内で撹拌混合されてその直後にポンプ本体が吸引するので固定片の沈下分離の余裕を与えずにポンプに供給でき、従って、ポンプ出口からの混合液は、固形片の混合の均一性に優れている。
【0008】
さらに、本発明の混合攪拌ポンプは、攪拌混合と供給との機能を同時に有するので、攪拌構造とポンプ構造を非常に小型にでき、しかも、回転軸を共有するので、撹拌混合用のモータを省き、撹拌混合のタンクや配管を節減できて、設置スペースを小さくできる利点がある。
【0009】
【発明の実施の形態】
本発明の撹拌混合ポンプは、詳しくは、渦巻室の内部に回転軸によって回転駆動される羽根車を備えた渦巻ポンプ本体と、該渦巻ポンプ本体の吸入口部に取り付けられ、回転軸の方向に長い筒状ケーシングと、該筒状ケーシングのポンプ本体に対する反対側端部に設けて混合流体が供給される混合流入口部と、該筒状ケーシングの内部に延長されたポンプ本体回転軸の延長部と、該回転軸延長部の周囲に設けられた複数の撹拌羽根と、から成るものである。
【0010】
筒状のケーシングは、縦長の筒状管であり、渦巻ポンプ本体の吸入口部に接続されている。回転軸延長部は、ボンプの回転軸の延長部であり、筒状ケーシング内に装入されている。延長部には、周囲に攪拌羽根が設けられて、ポンプロータの回転と共に攪拌羽根が回転する。ケーシングの混合流入口部には、固形片と液体とが混合又は未混合の状態で供給され、ポンプロータの回転と共に、ポンプ本体が、筒状ケーシング内に固形片と液体とを吸引し、筒状ケーシング内で、攪拌羽根が固形片と液体とを混合攪拌して混合液としながら、ポンプ本体に流入させる。流入した混合液は、ポンプロータの羽根車により、ポンプ本体の出口部に送られ、接続配管に送給される。
【0011】
上記の筒状ケーシングは、渦巻ポンプ本体の吸入口部に交換可能に主津着されるのが好ましく、回転軸延長部は、ポンプ回転軸に交換可能に取り付けるのが好ましく、これにより、筒状ケーシングや回転軸延長部の保守点検修理が容易になり、また、固形片の形状・性質に対応して適切な撹拌羽根を有する回転軸延長部に交換できる利点がある。
【0012】
撹拌羽根は、回転方向に対して混合流体をポンプ本体の吸入口部に向かって送りをかける捩りを有する多数のパドル羽根から構成することができる。パドル羽根は、回転軸方向に対する捩り角度を小さくし、各羽根を回転軸延長部廻りに外周側に突出させて、互いに離間して、且つ、攪拌には十分に作用して筒状ケーシング内周とパドル羽根先端との間に流路を形成するように突出高さを小さくするのが好ましい。これにより、比較的回転速度が大きなポンプ回転軸によって、延長部が直接回転駆動されても、撹拌混合効果を得ながら、ポンプ吸入口部に送りをかけ過ぎるのを防いで攪拌滞留時間を稼ぎ、また羽根先端のキャビテーション損傷を防ぐことができる。
【0013】
撹拌羽根の別の形態は、回転方向に対して混合流体をポンプ本体の吸入口部に向かって送りをかける捩りを有する螺旋羽根から構成することもできる。螺旋羽根は、螺旋の捩り角度を小さくし、螺旋体を回転軸延長部廻りに外周側に突出させて、攪拌には十分に作用して筒状ケーシング内周と螺旋羽根の先端との間に流路を形成するように螺旋体の突出高さを小さくするのが好ましい。こうすることにより、比較的回転速度が大きなポンプ回転軸によって回転軸延長部が直接回転駆動されても、螺旋羽根で撹拌混合効果を得つつもポンプ本体吸入口部に送りをかけ過ぎるのを防いで混合流体の攪拌滞留時間を稼ぐことができ、また羽根周囲のキャビテーション損傷を防ぐことができる。
【0014】
さらに、ボンプ回転軸と回転軸延長部とは直結されても良いが、ボンプ回転軸と回転軸延長部の結合部に、適当な減速機を介在させることもでき、回転軸延長部の回転速度を、ポンプ回転軸の回転速度よりも下げて、回転駆動させるようにしても良い。このような減速機には、例えば、遊星歯車式の減速機が利用できる。減速機を設けて、低速回転の攪拌羽根により、ポンプ本体吸入口部に送りをかけ過ぎるのを有効に防ぎ、また羽根周囲のキャビテーション損傷を防ぐことができる。
【0015】
筒状ケーシングの混合流入口部には、好ましくは、縦長にした気泡分離用の縦長管を立設して接続する。縦長管は、固形片が供給される開口部を上端に有し、流体が供給される流体入口部を開口部より下方位置に有するものが好ましい。
【0016】
縦長管は、空気を吸い込む原因となる固形片の供給開口部をできるだけ入口部から離すようにして、後工程での固形片の分離に有害な気泡の発生を防止し、上方に浮上させて分離することができる。
【0017】
別の形態は、筒状ケーシングの混合流入口部には、固形片と流体を受容して下部の入口部に供給する受容槽を直接に接続することができ、あまり気泡の発生に影響されない撹拌混合の場合に、受容槽を通じて固形片と液体とを直接に攪拌混合ポンプに供給することもでき、攪拌混合ポンプの構造を簡素化することができる。
【0018】
本発明の攪拌混合ポンプは、固形片と液体との混合とその混合液の送給に広く利用することができるが、特に、固形片をプラチック片として、多種類の混合したプラスチック片を種類別に分離するための比重分離装置の前段階に接続して使用することができる。液体は、水その他、混合液の用途に従って選ばれるが、上記の比重分離装置では、混合プラスチック片の種類に応じて比重分離に適当な比重を調整した重液が利用できる。
【0019】
【実施例】
以下の実施例では、固形片として2種類以上のプラスチック細片と、液体として水と、を撹拌混合する例を示す。
【0020】
図1は、比重分離設備の概略を示すが、比重の異なる各種プラスチックを含む廃棄プラスチックPが供給され、粉砕機5によって、約5mm平方から約30mm平方の細かいプラスチック細片P2に粉砕され、定量供給機によって一定量づつ、混合攪拌ポンプに供給される。この設備には、比重分離装置20を設けて、廃棄プラスチック片の中の軽質のブラスチックLPと重質のプラスチックHPとを分離しているが、分離されたプラスチックから分離用篩25、26により水切りされ、その廃液を利用して、再び、廃棄プラスチック片に混合して比重分離装置20に戻している。
【0021】
実施例の攪拌混合ポンプ1は、上記廃液の水その他の比重を調節した液体Wとプラスチック片P2とを混合して給送するのに利用されている。
撹拌混合ポンプ1は、モータMによって継手Cを介して100〜300RPMで回転駆動される羽根車1bを備えた回転軸16を渦巻室1aの内部に回転可能に支持した渦巻ポンプ本体3を備えており、このポンプ本体の吸入口部17に、撹拌混合部10をフランジFを介して取り付けている。
【0022】
撹拌混合部10は、回転軸16の方向に長い円筒状ケーシング11と、該ケーシング11のポンプ渦巻室1aから反対側の端部に設けられ、混合流体が供給される混合流入口部11aと、該ケーシング11の内部に延長されたポンプ回転軸の延長部12と、該回転軸延長部12の周囲に設けられた複数のパドル状撹拌羽根13とから構成されている。
【0023】
この混合攪拌ポンプは、従来は別設されていた撹拌混合タンクをポンプに一体に組み込んだ構造によって配管を省略して、占有スペースを小さくすることができ、また、撹拌羽根13をポンプ回転軸16の延長部12で回転駆動するようにしているので撹拌混合と供給の構成が非常にコンパクトにされている。
【0024】
混合流入口部11aには、プラスチック細片P2が供給される頂部開口部14aを上端に有し、比重調節槽40からの戻りの水Wが供給される液体入口部14bを上部に有する上下に長い縦長管14が接続されている。
【0025】
縦長管14は、気泡分離管として働くもので、定量供給されるプラスチック細片P2を戻りの水Wと共に吸引して一定混合率を維持しながら、プラスチック細片P2の供給頂部開口部14aからの空気の吸い込みを最少限に抑制して、後工程の比重分離装において、気泡による分離精度が低下することを防いでいる。
【0026】
回転軸延長部12は、ポンプ回転軸13にネジ継手(不図示)で交換可能に取り付けられ、固形片の性質、寸法、あるいは形状に対応して適切な撹拌羽根13を備えた回転軸延長部に交換できるようにされている。
【0027】
この例は、攪拌羽根として、パドル撹拌羽根13を使用するが、パドル羽根13は、各羽根を回転軸延長部廻りに外周側に突出させて、混合流体にポンプ吸入口部17の方向に送りを掛けるように回転軸方向に対して小さな捩り角度を設けている。さらに、多数のパドル羽根13は、回転軸延長部12の軸長手方向にわたってそれぞれ互いに離間して配置している。パドル羽根は、攪拌の機能を十分に果たして、筒状ケーシング内周とパドル羽根先端との間に広い流路を形成するように突出高さが小さくされている。
【0028】
これらのパドル羽根13は、比較的回転速度が大きなポンプ回転軸16によって、回転軸延長部12が直接回転駆動されても、十分な撹拌混合効果を得ながら、ポンプ吸入口部17に送りをかけ過ぎるのを防いで、 混合部における混合流体の攪拌滞留時間を稼ぐことができ、また、パドル羽根13に対す流速を比較的小さくして、羽根先端のキャビテーション損傷を防ぐことができる。
【0029】
回転軸延長部12の先側は、片持ち状態にすることもできるが、この例では、回転軸延長部12の先側端部を、軸受を介して、ケーシングの混合流入口部11a側の端面に支持している。
【0030】
図2には、別の実施例に係る撹拌混合ポンプ2を示すが、混合部101に回転軸延長部121に螺旋撹拌羽根131を備えた点で、図1の攪拌攪拌ポンプ1とは異なっている。
【0031】
螺旋羽根131は、螺旋体を回転軸延長部121の廻りに外周側に突出させて軸方向に形成され、ポンプ本体3の混合流体を吸入口部17に向けて送り掛けるように螺旋の小さい捩り角度を有し、攪拌には十分に作用して筒状ケーシング11内周と螺旋羽根13の先端との間に流路を形成するように螺旋体の突出高さを小さくしている。
【0032】
こうすることにより、比較的回転速度が大きなポンプ回転軸16によって回転軸延長部121が直接回転駆動されても、螺旋羽根131で撹拌混合効果を得ながら、ポンプ本体吸入口部17に送りをかけ過ぎるのを防いで混合流体の攪拌滞留時間を稼ぐことができ、また羽根周囲のキャビテーション損傷を防ぐことができる。
【0033】
この例のケーシング11の混合液入口部111aには、プラスチック片P2と流体Wが供給される受容槽141が接続されている。受容槽141は、固形片供給管と給水管とを並列して上部に接続した槽であり、固形片供給管からの固形片P2と給水管からの水Wとを同時に受容して、槽下部から混合液入口部111aに供給している。このような受容槽は、特に、気泡の発生に影響されない撹拌混合の場合に好適に使用される。
【図面の簡単な説明】
【図1】 本発明の実施例に係る撹拌混合ポンプとそれを利用した比重分離装置を示す。
【図2】 本発明の別の実施例に係る撹拌混合ポンプの模式的断面図である。
【符号の説明】
1 撹拌混合ポンプ
1a 渦巻室
1b 羽根車
2 撹拌混合ポンプ
3 渦巻ポンプ
10 混合部
11 ケーシング
11a 入口部
12 ポンプ回転軸の延長部
13 撹拌羽根(パドル羽根)
131撹拌羽根(螺旋羽根)
14 縦長管
141 受容槽
14a 頂部開口部
14b 液体入口部
15 ポンプ
16 回転軸
17 ポンプ吸入口部
P2 プラスチック片
W 水
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stirring and mixing pump for mixing and supplying a mixed flow obtained by mixing a liquid and plastic strips before being supplied to a processing apparatus.
[0002]
[Prior art]
Plastics are widely used in modern life and are discarded in large quantities from various fields. In recent years, various sports drinks, mineral water, and tea have been sold at vending machines and have been increasing every year, and many used PET bottles have been discarded as they are sold at convenience stores. ing. These plastics are expected to be separated with high precision according to the type of plastics for the production of recycled fibers, and the use of recycled plastics or oils.
[0003]
There is a specific gravity separation method for separating plastic pieces, but in order to separate various plastics with high accuracy, for example, it is necessary to mix plastic pieces crushed to about 5 to 30 mm well with specific gravity liquid, Conventionally, a mixing agitation tank having an agitation blade inside is provided in front of a pump.
[0004]
[Problems to be solved by the invention]
If a mixing agitation tank is separately provided in the previous stage of the pump, the mixing agitation tank requires a relatively large installation location and piping to the pump, and a rotation driving motor for the agitation blades must also be provided separately. Further, when the distance to the pump is long, there is a tendency that a deviation occurs in the density of the mixture with respect to the liquid.
[0005]
The present invention has been devised in view of the above, and an object thereof is to provide a solid piece stirring and mixing pump that is excellent in reducing the space occupied by the mixing apparatus, can omit piping, and has high stirring and mixing ability. It is said.
[0006]
[Means for Solving the Problems]
The stirring and mixing pump of the present invention is provided with a casing having a stirring blade for mixing and stirring directly connected to the pump shaft on the suction port side of the spiral pump body, and the solid pieces and liquid in the mixed flow are previously stirred in the casing. Mix and immediately suck into the centrifugal pump body and then deliver.
[0007]
In the present invention, a stirring blade for stirring and mixing is directly driven by a pump rotation shaft, and a mixed flow composed of solid pieces and liquid is stirred and mixed in a casing, and immediately after that, the pump body sucks, so that the fixed piece sinks. The pump can be supplied to the pump without providing a margin for separation. Therefore, the mixed liquid from the pump outlet is excellent in mixing uniformity of the solid pieces.
[0008]
Furthermore, since the mixing and stirring pump of the present invention has the functions of stirring and mixing at the same time, the stirring structure and the pump structure can be made very small, and since the rotating shaft is shared, the motor for stirring and mixing is omitted. There is an advantage that the tank and piping for stirring and mixing can be saved and the installation space can be reduced.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Specifically, the stirring and mixing pump of the present invention is attached to a spiral pump main body provided with an impeller that is driven to rotate by a rotary shaft inside the spiral chamber, and to a suction port portion of the spiral pump main body, in the direction of the rotary shaft A long cylindrical casing, a mixed inlet portion provided at the opposite end of the cylindrical casing with respect to the pump main body, to which a mixed fluid is supplied, and an extension portion of the pump main body rotating shaft extended inside the cylindrical casing And a plurality of stirring blades provided around the rotating shaft extension.
[0010]
The cylindrical casing is a vertically long cylindrical tube, and is connected to the suction port portion of the spiral pump main body. The rotary shaft extension is an extension of the rotary shaft of the bump and is inserted into the cylindrical casing. The extension portion is provided with a stirring blade around it, and the stirring blade rotates with the rotation of the pump rotor. Solid pieces and liquid are supplied to the mixing inlet of the casing in a mixed or unmixed state, and the pump main body sucks the solid pieces and liquid into the cylindrical casing along with the rotation of the pump rotor. In the cylindrical casing, the stirring blade flows into the pump body while mixing and stirring the solid piece and the liquid to form a mixed liquid. The mixed liquid that has flowed in is sent to the outlet portion of the pump body by the impeller of the pump rotor, and is fed to the connection pipe.
[0011]
The cylindrical casing is preferably attached to the suction port portion of the centrifugal pump body so as to be replaceable, and the rotary shaft extension portion is preferably attached to the pump rotary shaft so as to be replaceable. Maintenance and inspection of the casing and the rotary shaft extension can be facilitated, and there is an advantage that the rotary shaft extension can be replaced with an appropriate stirring blade corresponding to the shape and properties of the solid piece.
[0012]
The stirring blade can be composed of a large number of paddle blades having a twist for sending the mixed fluid toward the suction port portion of the pump body in the rotation direction. The paddle blades have a small twist angle with respect to the rotation axis direction, project each blade toward the outer periphery around the rotation shaft extension, are spaced apart from each other, and sufficiently act on stirring so that the inner periphery of the cylindrical casing It is preferable to reduce the protrusion height so as to form a flow path between the tip of the paddle blade and the paddle blade tip. Thereby, even if the extension part is directly driven by rotation by the pump rotation shaft having a relatively high rotational speed, while obtaining the stirring and mixing effect, the pump suction port part is prevented from being excessively fed to increase the stirring residence time, Further, cavitation damage at the blade tip can be prevented.
[0013]
Another form of the stirring blade may be formed of a spiral blade having a twist that feeds the mixed fluid toward the suction port portion of the pump body with respect to the rotation direction. The spiral blade reduces the twist angle of the spiral, causes the spiral body to protrude to the outer peripheral side around the rotating shaft extension, and works sufficiently for stirring to flow between the inner periphery of the cylindrical casing and the tip of the spiral blade. It is preferable to reduce the protruding height of the spiral so as to form a path. In this way, even if the rotary shaft extension is directly driven by the pump rotary shaft having a relatively high rotational speed, it is possible to prevent the pump body intake port from being overfed while obtaining the stirring and mixing effect with the spiral blade. Thus, it is possible to increase the stirring residence time of the mixed fluid and to prevent cavitation damage around the blade.
[0014]
Further, the rotary shaft and the rotary shaft extension may be directly connected, but an appropriate speed reducer can be interposed at the joint between the rotary shaft and the rotary shaft extension. May be driven to rotate at a lower speed than the rotational speed of the pump rotating shaft. As such a reduction gear, for example, a planetary gear type reduction gear can be used. By providing a speed reducer, it is possible to effectively prevent the pump main body suction port portion from being excessively fed and to prevent cavitation damage around the blade by using a low speed rotating stirring blade.
[0015]
Preferably, a vertically long bubble separation tube is installed upright and connected to the mixing inlet of the cylindrical casing. The vertically long pipe preferably has an opening to which solid pieces are supplied at the upper end and a fluid inlet to which fluid is supplied at a position below the opening.
[0016]
The vertical pipe keeps the supply opening of the solid piece that causes air inhalation away from the inlet as much as possible to prevent the generation of bubbles harmful to the separation of the solid piece in the subsequent process, and floats upward to separate it can do.
[0017]
In another form, the mixing flow inlet of the cylindrical casing can be directly connected to a receiving tank for receiving solid pieces and fluid and supplying them to the lower inlet. In the case of mixing, the solid piece and the liquid can be directly supplied to the stirring and mixing pump through the receiving tank, and the structure of the stirring and mixing pump can be simplified.
[0018]
The stirring and mixing pump of the present invention can be widely used for mixing a solid piece and a liquid and feeding the mixed liquid. In particular, the solid piece is a plastic piece, and various types of mixed plastic pieces are classified by type. It can be used by being connected to the previous stage of the specific gravity separator for separation. The liquid is selected according to the use of water or other liquid mixture. In the above specific gravity separator, a heavy liquid having an appropriate specific gravity for specific gravity separation can be used according to the type of the mixed plastic piece.
[0019]
【Example】
In the following examples, two or more types of plastic strips as solid pieces and water as a liquid are stirred and mixed.
[0020]
FIG. 1 shows an outline of specific gravity separation equipment. Waste plastic P containing various plastics having different specific gravities is supplied, and is pulverized by a pulverizer 5 into fine plastic strips P2 having a size of about 5 mm square to about 30 mm square. A constant amount is supplied to the mixing and stirring pump by a feeder. This equipment is provided with a specific gravity separation device 20 to separate light plastic LP and heavy plastic HP in waste plastic pieces from the separated plastic by separating sieves 25 and 26. The waste water is drained, and the waste liquid is mixed again with the waste plastic piece and returned to the specific gravity separator 20.
[0021]
The stirring and mixing pump 1 of the embodiment is used for mixing and feeding the liquid W and the plastic piece P2 in which the specific gravity of the waste liquid is adjusted.
The stirring and mixing pump 1 includes a spiral pump body 3 that rotatably supports a rotary shaft 16 including an impeller 1b that is rotationally driven at 100 to 300 RPM via a joint C by a motor M within the spiral chamber 1a. The stirring and mixing unit 10 is attached to the suction port 17 of the pump body via a flange F.
[0022]
The stirring and mixing unit 10 includes a cylindrical casing 11 that is long in the direction of the rotation shaft 16, a mixing inlet 11 a that is provided at an end of the casing 11 opposite to the pump spiral chamber 1 a and to which a mixed fluid is supplied, The pump 11 includes a pump rotation shaft extension 12 extended inside the casing 11 and a plurality of paddle-shaped stirring blades 13 provided around the rotation shaft extension 12.
[0023]
This mixing agitation pump has a structure in which an agitation / mixing tank, which has been separately provided in the past, is integrated into the pump so that piping can be omitted, and the occupied space can be reduced. Therefore, the configuration of stirring and mixing and supply is very compact.
[0024]
The mixed inlet 11a has a top opening 14a to which the plastic strip P2 is supplied at the upper end, and a liquid inlet 14b to which the return water W from the specific gravity adjusting tank 40 is supplied at the top and bottom. A long vertical tube 14 is connected.
[0025]
The vertical tube 14 functions as a bubble separation tube, and sucks the plastic strip P2 supplied in a fixed amount together with the returning water W to maintain a constant mixing ratio, while maintaining a constant mixing rate from the supply top opening 14a of the plastic strip P2. Inhalation of air is suppressed to the minimum to prevent the separation accuracy due to air bubbles from being lowered in the specific gravity separator in the subsequent process.
[0026]
The rotary shaft extension 12 is attached to the pump rotary shaft 13 in a replaceable manner with a screw joint (not shown) and includes a rotary shaft extension having an appropriate stirring blade 13 corresponding to the nature, size, or shape of the solid piece. To be replaced.
[0027]
In this example, paddle stirring blades 13 are used as stirring blades. The paddle blades 13 project each blade around the rotating shaft extension portion toward the outer peripheral side, and send the mixed fluid in the direction of the pump suction port portion 17. A small twist angle is provided with respect to the direction of the rotation axis. Further, a large number of paddle blades 13 are arranged away from each other over the longitudinal direction of the rotary shaft extension 12. The paddle blades sufficiently perform the stirring function and have a small protruding height so as to form a wide flow path between the inner circumference of the cylindrical casing and the tip of the paddle blade.
[0028]
These paddle blades 13 are fed to the pump inlet port 17 while obtaining a sufficient stirring and mixing effect even when the rotary shaft extension 12 is directly rotated by the pump rotary shaft 16 having a relatively high rotational speed. Therefore, it is possible to increase the stirring and residence time of the mixed fluid in the mixing section, and to reduce the flow velocity with respect to the paddle blade 13 to prevent cavitation damage at the blade tip.
[0029]
Although the front side of the rotary shaft extension 12 can be cantilevered, in this example, the front end of the rotary shaft extension 12 is connected to the mixed inlet portion 11a side of the casing via a bearing. It is supported on the end face.
[0030]
FIG. 2 shows a stirring and mixing pump 2 according to another embodiment, which is different from the stirring and stirring pump 1 of FIG. 1 in that the mixing unit 101 is provided with a spiral stirring blade 131 in the rotating shaft extension 121. Yes.
[0031]
The spiral blade 131 is formed in the axial direction by projecting a spiral body around the rotary shaft extension 121 to the outer peripheral side, and a small twist angle of the spiral so as to send the mixed fluid of the pump body 3 toward the suction port 17. The projecting height of the spiral body is reduced so as to sufficiently act on stirring and form a flow path between the inner periphery of the cylindrical casing 11 and the tip of the spiral blade 13.
[0032]
As a result, even if the rotary shaft extension 121 is directly driven by the pump rotary shaft 16 having a relatively high rotational speed, the pump blade suction port 17 is fed while the stirring and mixing effect is obtained by the spiral blade 131. Therefore, it is possible to increase the stirring residence time of the mixed fluid and to prevent cavitation damage around the blade.
[0033]
A receiving tank 141 to which the plastic piece P2 and the fluid W are supplied is connected to the mixed liquid inlet 111a of the casing 11 in this example. The receiving tank 141 is a tank in which a solid piece supply pipe and a water supply pipe are connected in parallel to the upper part, and simultaneously receives the solid piece P2 from the solid piece supply pipe and the water W from the water supply pipe. To the liquid mixture inlet 111a. Such a receiving tank is preferably used particularly in the case of stirring and mixing that is not affected by the generation of bubbles.
[Brief description of the drawings]
FIG. 1 shows a stirring and mixing pump according to an embodiment of the present invention and a specific gravity separation device using the stirring and mixing pump.
FIG. 2 is a schematic cross-sectional view of a stirring and mixing pump according to another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Stirring mixing pump 1a Centrifugal chamber 1b Impeller 2 Stirring mixing pump 3 Centrifugal pump 10 Mixing part 11 Casing 11a Inlet part 12 Extension part of a pump rotating shaft 13 Stirring blade (paddle blade)
131 stirring blade (spiral blade)
14 Vertical pipe 141 Receiving tank 14a Top opening 14b Liquid inlet 15 Pump 16 Rotating shaft 17 Pump suction port P2 Plastic piece W Water

Claims (4)

比重の異なる各種プラスチックを含む廃棄プラスチックPを粉砕した、約5mm平方から約30mm平方の細かいプラスチック細片P2と液体Wとを混合して供給する混合攪拌ポンプ1,101であって、
渦巻室1aの内部に回転軸によって回転駆動される回転半径の大きい羽根車1bを備え、プラスチック細片P2と液体Wとの混合流を送る渦巻ポンプ3本体と、
渦巻室1aより小径で、一端部が渦巻ポンプ3の吸入口部に取り付けられ、他端部にプラスチック細片P2と液体Wとを含む混合流を供給する混合流入口部を備えた回転軸方向に長い筒状ケーシング11と、該筒状ケーシング11の内部に延長されたポンプ回転軸16の延長部と、該回転軸の延長部の周囲に設けられた複数の撹拌羽根13,131とからなる攪拌混合部とを備え、
上記撹拌羽根が、回転方向に対して混合流体をポンプ本体の吸入口部に向かって送りをかける捩りを有する多数のパドル羽根13または螺旋羽根131からなり、該捩りがポンプ本体の吸入口部17に送りをかけ過ぎず混合流を維持するに必要な十分な攪拌作用を与える小さな捩り角度であるとともに、上記攪拌羽根先端は上記筒状ケーシング11との間に流路を形成し、上記ポンプ回転軸を100〜300rpmで回転させることにより上記攪拌混合部の多数のパドル羽根13または螺旋羽根131でプラスチック細片P2と液体Wとを均一に攪拌混合すると同時に、渦巻室1aの内部に羽根車1bの回転によりポンプ本体の吸入口部から混合流を吸い込み、供給口から混合流を送出することを特徴とする廃棄プラスチックの攪拌混合ポンプ。
A mixing agitation pump 1,101 that mixes and supplies liquid W with fine plastic strips P2 of about 5 mm square to about 30 mm square pulverized from waste plastic P containing various plastics having different specific gravities,
A centrifugal pump 3 main body including an impeller 1b having a large rotation radius that is rotationally driven by a rotary shaft inside the spiral chamber 1a, and sending a mixed flow of the plastic strip P2 and the liquid W;
Rotating shaft direction having a smaller diameter than the spiral chamber 1a, one end attached to the suction port of the spiral pump 3, and the other end provided with a mixed inlet for supplying a mixed flow containing the plastic strip P2 and the liquid W A long cylindrical casing 11, an extension portion of the pump rotating shaft 16 extended inside the cylindrical casing 11, and a plurality of stirring blades 13 and 131 provided around the extending portion of the rotating shaft. A stirring and mixing unit,
The stirring blade is composed of a number of paddle blades 13 or spiral blades 131 having a twist for feeding the mixed fluid toward the suction port portion of the pump body in the rotation direction, and the twist is the suction port portion 17 of the pump body. The tip of the stirring blade forms a flow path between the cylindrical casing 11 and the rotation of the pump. By rotating the shaft at 100 to 300 rpm, the plastic strip P2 and the liquid W are uniformly stirred and mixed by the large number of paddle blades 13 or spiral blades 131 of the stirring and mixing unit, and at the same time, the impeller 1b is placed inside the spiral chamber 1a. The agitated and mixed pump for waste plastic, wherein the mixed flow is sucked from the suction port portion of the pump main body and the mixed flow is sent out from the supply port .
混合流入口部11aには縦長管14が立設されて接続され、該縦長管14が、固形片を供給する固形片開口部14aを上端に有し、流体を供給する流体入口部14bを固形片開口部14aより下方位置に有する請求項1記載の攪拌混合ポンプ。 A vertically long tube 14 is erected and connected to the mixed inlet 11a. The vertically long tube 14 has a solid piece opening 14a for supplying solid pieces at the upper end, and a fluid inlet portion 14b for supplying fluid is solid. The stirring and mixing pump according to claim 1, wherein the stirring and mixing pump is located below the one opening 14 a. 混合流入口部111aには、固形片と流体とを受容する槽141が接続されている請求項1記載の攪拌混合ポンプ。 The stirring and mixing pump according to claim 1, wherein a tank 141 for receiving solid pieces and fluid is connected to the mixing inlet 111a. 上記の筒状ケーシング11が、渦巻ポンプ本体の吸入口部に取り外し可能に取り付けられ、回転軸の延長部12が、ポンプ回転軸16に交換可能に取り付けられている請求項1記載の攪拌混合ポンプ。 The stirring and mixing pump according to claim 1, wherein the cylindrical casing (11) is detachably attached to the suction port portion of the centrifugal pump body, and the rotating shaft extension (12) is replaceably attached to the pump rotating shaft (16). .
JP2003119834A 2003-04-24 2003-04-24 Stir and mix pump Expired - Fee Related JP4410483B2 (en)

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