JP4070326B2

JP4070326B2 - Non-contact stirring device

Info

Publication number: JP4070326B2
Application number: JP29875098A
Authority: JP
Inventors: 慎一秋山
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-10-20
Filing date: 1998-10-20
Publication date: 2008-04-02
Anticipated expiration: 2018-10-20
Also published as: JP2000124030A

Description

【０００１】
【発明の属する技術分野】
本発明は高温超電導体と永久磁石の非接触浮上現象を利用した非接触回転装置に関する。
【０００２】
【従来の技術】
従来技術として、真空ポンプ等では永久磁石の反発を利用した磁気浮上の軸受と称して市販されている。
また、特許第２６７３４６２号、発明の名称、非接触撹拌装置が公告されている。
【０００３】
【発明が解決しようとする課題】
従来の真空ポンプに使われている磁気浮上の軸受けは構造が複雑で液体をかき混ぜる装置には不向きである。
【０００４】
特許の名称非接触撹拌装置にあっては、超電導円筒を冷凍しその内側の容器を熱遮断すると撹拌翼である磁石との距離が遠くなり、撹拌容器の直径が大きくなるに従いピン止め力は大幅に減少する。また、回転駆動源のソレノイドコイルから撹拌のための回転トルクを撹拌翼に与えるには、大型になり実用化に問題がある。
【０００５】
ところで、医薬品の製造ラインでは、ある薬品が終わると容器を洗浄し別の医薬品を製造するとき、もし洗浄が十分でなければ、前の医薬品が後の医薬品に混入することもあり、厳重な交差汚染対策が望まれている。そのためには、密閉容器の中で非接触撹拌ができ、容器内の洗浄性に優れた装置が望まれる。
また、半導体製造分野においても医薬品製造とは異業種であるが異物混入に関しては技術的な共通性をもっている。
さらに、産業界では、混合する液体を連続的に供給して、混合された液が連続的に吐出さるれ非接触連続撹拌機が望まれている。
【０００６】
本発明は、このような実情に鑑みなされ、磁気浮上現象を利用した非接触回転装置と、その非接触回転装置を応用した非接触撹拌装置を提供することを目的としている。
【０００７】
【課題を解決するための手段】
第１の発明の非接触回転装置は、上述の課題を解決するための手段を以下のように構成している。すなわ真空室内に冷凍部と固着したピン止め力の強い塊状の高温超電導体と、その高温超電導体と離間して対向する磁気浮上磁石と、磁気浮上磁石の一方の端に結合された回転軸と、その回転軸のもう一方の端に結合された磁気力で回転する被駆動磁石とでなる非接触回転部、そして被駆動磁石と適宜離間して配設して被駆動磁石に磁気力で回転を与える駆動磁石と駆動源とからなり、回転軸がその軸の長さ方向に移動する変位を検出して出力する変位センサーと、その変位センサーの出力信号を受けて非接触回転部の変位を制御する変位制御手段を備えたことを特徴としている。
【０００８】
第２の発明は、真空室内に冷凍部と固着したピン止め力の強い塊状の高温超電導体と、その真空室の一部を介して前記高温超電導体と離間して対向する磁気浮上磁石と、磁気浮上磁石の外周に非磁性体で支持された円筒外周面多極磁石と、円筒外周面多極磁石の円周面が適宜離間してステーター（コイル）を有し、そのモーター機構を有するステーターに電気を供給するドライバとからなる非接触回転部であって、その非接触回転部を、もう１組対向させて１対１組の非接触回転装置とする。
【０００９】
第３の発明は、回転軸のもう一方の端に固定され磁気力で回転する被駆動磁石の両面２極型磁石と、被駆動磁石に磁気力で回転を与える前記駆動源の回転軸に固定されて回転駆動される駆動磁石は、長手方向にＶ字形の一面の長手方向一端近傍部分を一方の極の磁極とし、その一面の該長手方向他端近傍を他方の極の磁極とする左右２極型磁石を有し、その左右２極型磁石の磁極面がなす角度は、両面２極型磁石の回転中心延長線上に直行してなる面を基準面とし、左右２極型磁石の一方の極の磁極面の角度が１゜から４５゜とし、また他方の極の磁極面の角度が１゜から４５゜とする。
【００１０】
第４の発明は、回転軸のもう一方の端に固定され磁気力で回転する被駆動磁石において、長手方向に平行な一面である表面全面を一方の極の磁極とし、その表面の反対の面である裏面全面を他方の極の磁極とする両面２極型磁石の磁極面が、多角形（ホームベース状）または台形状の被駆動磁石であって、その被駆動磁石の回転中心延長線上に駆動磁石の回転中心を合わせ、その駆動磁石の長手方向にＶ字形の左右２極型磁石の磁極面の配設角度と位置は、前記被駆動磁石の回転外周傾斜面の傾斜角と同じとし、適宜離間して配設する。
すなわち、両面２極型磁石を被駆動磁石とし、左右２極型磁石を駆動磁石とする組み合わせで、回転力を大きくしてスラスト力は小さくしする。
【００１１】
第５の発明は、高温超電導装置のピン止め力を利用する場合には、回転駆動系での回転軸方向のスラスト力を極力軽減することが必要である。
非接触回転部の回転軸中心延長線上の被駆動磁石の位置に円盤型両面２極磁石を配設して、その円盤型両面２極磁石の外周に非磁性体で支持された円筒外周面多極磁石を配設し、駆動回転軸の先端に円盤型両面２極磁石を配設し、その円盤型両面２極磁石の外周に非磁性体で支持された円筒内周面多極磁石は、円筒外周面多極磁石と適宜離間して配設する。
【００１２】
第６の発明は、非接触回転装置を非接触撹拌装置に応用する場合に、撹拌をする液体を入れる開放容器または密閉容器内に収納する、ピン止め力で保持された磁気浮上磁石と回転軸と被駆動磁石とでなる非接触回転部の重量を軽減するために、別な撹拌翼を用いないで、磁気浮上磁石と被駆動磁石のいずれか他方の磁石を撹拌翼状に合成樹脂により被覆形成する、または、磁気浮上磁石及び被駆動磁石を撹拌翼状に合成樹脂により被覆形成する。撹拌翼状には合成樹脂に限らず非磁性体の金属で被覆形成する。
【００１３】
第７の発明は、連続撹拌のための容器は、密閉容器とし、撹拌する液体を送り込む供給口を適宜数と、撹拌処理を終えた液体を排出する排出口を適宜数備え、１対１組の高温超電導装置と１対１組の非接触撹拌装置を設ける。
【００１４】
第８の発明は、撹拌中に何らかの要因で被駆動磁石が離脱して旋回運動（すりこぎ棒のような運動）を起こしたとき、その旋回運動の軌跡近傍に磁気センサーを複数個配設しておき、被駆動磁石が磁気センサー近傍にくると磁気センサーは、被駆動磁石の磁気を検出して、出力信号を回転制御部へ送る。回転制御部は、磁気センサーの出力信号を受けて被駆動磁石を元に戻すための制御出力を駆動源に送るようにする。
【００１５】
【発明の実施の形態】
以下に本発明の非接触回転装置の実施形態を図面を参照しつつ説明する。
図１は非接触回転装置の模式的な構成を示し、Ａは非接触回転装置、Ｂは非接触回転部、符号１は冷凍が可能な高温超電導体、２は磁気浮上磁石、３は磁気浮上磁石と被駆動磁石を連結する回転軸、４は撹拌翼を有する被駆動磁石、５は被駆動磁石に磁気力で回転を与える駆動磁石、６は駆動磁石を回転させる駆動源、７は熱移動を遮断する真空室、８は冷凍部、１１ａ、１１ｂは変位センサー、１２は変位制御手段。
【００１６】
このような非接触回転装置では、高温超電導体と磁気浮上磁石とからなるピン止め力を最大にすることが実用化に向けて大切になる。
実施例によると、第２種超電導体のイットリウム系高温超電導体の厚みのある円盤（バルク）をパルス管冷凍機の冷凍部に固着して、熱伝導を遮断するために真空室を設ける。
冷凍手段はパルス管冷凍機に限らず約９０Ｋを保てるならば液体窒素等でも良い。
【００１７】
磁気浮上磁石を真空室の外壁を介して高温超電導体と対向して密着させ真空にしながら冷凍を始める。
真空度が約１０-6Ｔｏｒｒに到達し、かつ、冷凍温度が臨界温度以下の約９０Ｋ（−１８３℃）に到達したら磁気浮上磁石を取り除く。
再び磁気浮上磁石を手で高温超電導体に近づけていくと、高温超電導体と離間した位置で反発力を受ける、その位置で手を離すと空間に浮上する。
この位置が高温超電導体が磁気浮上磁石に記憶させられた位置である。
手で磁気浮上磁石を左右に動かすと記憶した位置に戻ろうとする、上に動かすと反発力を受け、下に動かすと吸引力を受けて元に戻ろうとする。これがピン止め力効果である。浮上位置については、磁気浮上磁石に付帯される要素の重さで異なる。
また、磁気浮上磁石と高温超電導体との重力方向の関係位置によっても異なる。
【００１８】
同じ磁界の場合、磁気浮上磁石が高温超電導体の上にある場合には、磁気浮上磁石の重力が加わって高温超電導体に近づく方向に変位するのでクーロンの法則によりピン止めの保持力が強くなる。逆に、磁気浮上磁石が高温超電導体の下にある場合には、重力により遠ざかろうとするのでピン止め力は弱くなる。
よって実用向きには磁気浮上磁石が高温超電導体の上にある場合が好ましい。
【００１９】
磁気力で回転する被駆動磁石と駆動磁石については、前に述べた磁気浮上磁石と高温超電導体のピン止め力の性質により、極力吸引作用（スラスト力）を取り除き、極力磁気力を回転力（回転トルク）に変換する必要がある。
本発明者の磁気回転伝達装置（特許第２６７８５６９）の磁気回路を構成することにより、被駆動磁石に（限界以内において）負荷が掛かれば掛かるほど吸引力は減少していく作用を利用するとよい。
【００２０】
本発明者の磁気回転伝達装置の磁気回路を構成し、実験をおこなった結果、被駆動磁石と駆動磁石をよほど離さないとピン止め効果で保持することが出来なかった。それは、吸引力によるスラスト力が強いためである。そこで、種々の実験をおこなった。
【００２１】
図３は、駆動磁石の磁極面の傾斜角度の決め方を説明した図である。
回転中心延長線３１と直行している面は、磁極面の角度基準面３２でこのラインを０゜として説明する。
磁石面間距離特性実験。
従来の駆動磁石（傾斜角度０゜）と本発明の磁極面の傾斜角度１０゜、４０゜の磁石面間距離の特性実験をした測定結果が、表１である。
実験条件として、従来方式の駆動磁石と本発明の駆動磁石は同じ磁石を使い、傾斜の磁極面の場合は、左右の磁極面の中央を結ぶ直線と被駆動磁石の対向面とを設定距離とした。
以下、従来方式の駆動磁石と本発明の駆動磁石（２種の傾斜角度）の距離特性について説明する。
【００２２】
距離０ｍｍにおいて、従来の駆動磁石（傾斜角度０゜）の最大トルクは２７００ｇｃｍに対し、本発明の駆動磁石の傾斜角度１０゜おいての最大トルクは２８００ｇｃｍと１００ｇｃｍ多い。最大スラストは１５００ｇｆに対して１３００ｇｆと２００ｇｆ減少している。
以下、５ｍｍにおいては、最大トルクは２００ｇｃｍ多い、最大スラストは５０ｇｆ少ない。
【００２３】
本発明の駆動磁石の傾斜角度４０゜について考察すると、従来のトルクは２７００ｇｃｍに対し本発明は２３００ｇｃｍであるが、距離５ｍｍの時、従来と本発明ともトルクは１２００ｇｃｍである、距離１０ｍｍ、１５ｍｍ、２０ｍｍの時は、ほぼ同じ値を示している。
以上のことから、トルクが大きくてスラストが小さい駆動磁石の傾斜角度は従来の０゜より本発明の１０゜付近が一番効果的である。
【表１】

従来方式の駆動磁石に比して本発明の駆動磁石の方が回転トルクが増大し、スラスト力が減少することが分かった。
しかし、この実験は、本発明の磁気回路における特性を見いだすものであって、磁極間の距離０ｍｍは実用にならない。実用化は１ｍｍ以上である。
すなわち、本発明の駆動磁石と被駆動磁石との有効な距離は５ｍｍ付近であることが判明した。
【００２４】
磁極面角度特性実験。
従来の駆動磁石（傾斜角度０゜）と本発明の磁極面の傾斜角度１０゜、２０゜、３０゜、４０゜の磁極面角度の特性実験をした測定結果が、表２である。
実験条件は、全て同じ磁石を用い、本発明の駆動磁石と従来方式の被駆動磁石の間に１０ｍｍの非磁性の板を挟んで両磁石の距離を設定した。
以下、従来方式の駆動磁石と本発明の駆動磁石（４種の傾斜角度）の特性について表２をもとに説明する。
【００２５】
従来の駆動磁石（傾斜角度０゜）の最大トルクは６００ｇｃｍに対し本発明の駆動磁石（傾斜角度１０゜）の最大トルクは６００ｇｃｍと値は同じであるが最大スラストは５００ｇｆと１００ｇｆ減少している。以下、本発明の駆動磁石の傾斜角度２０゜、３０゜、４０゜においては、スラストの値は減少しているものの、同時にトルクも減少しているので結果的には、駆動磁石の傾斜角度は１０゜付近が一番効果的である。この実験は、実用化のためにおこなったものである。
【表２】

以上、磁石面間距離特性実験（表１）と磁極面角度特性実験（表２）の結果をまとめると、従来技術の駆動磁石と被駆動磁石の組み合わせにおいて、本発明の駆動磁石は、磁極面角度が約１０゜を中心にプラス１０゜マイナス５゜の範囲において、その距離は、約５ｍｍを中心にプラス５ｍｍマイナス３ｍｍが実用化の目安になる。
【００２６】
前記の実験で用いられた磁極面の角度を９０゜にするならば、従来のラジアル型カツプリングになる。従って、従来のラジアル型カツプリングの組み合わせで実験を行った結果。被駆動磁石が回転中心を保持出来ず、容器の内壁を擦る結果になった。
【００２７】
そこで、ラジアル型カツプリングを応用した非接触撹拌機の構成を図５により説明する。
【００２８】
非接触回転部の回転軸３の中心延長線上に、磁気浮上磁石の他端に円盤型両面２極磁石５１を配設して、その円盤型両面２極磁石５１の外周に非磁性体５２で支持された円筒外周面多極磁石５３を配設し、駆動回転軸５９の先端に円盤型両面２極磁石５４を配設し、その円盤型両面２極磁石の外周に非磁性体５５で支持された円筒内周面多極磁石５６が円筒外周面多極磁石５３と液体５８の入った容器５７の側壁を介して配設する。
【００２９】
このようにすると中央の磁石同志の吸引作用で回転の中心を保つことが出来る。より強力に中心を保つために、各々の吸引作用面を頭を切った円錐状にすると良い。このように回転の中心を保持することにより、ラジアル型カツプリングの内側磁石は偏心しないで撹拌ができる。
【００３０】
つぎに従来方式の磁極面が０゜の磁気回路と、従来のラジアル型カツプリングの磁気回路の中間の特性を持つ本発明に付いて図４で説明する。
被駆動磁石４１が両面２極型磁石で磁極面が多角形（ホームベース状）または台形板状で、回転軸３の先端に固定され、合成樹脂等で被覆して、そのまま撹拌羽根として使用する。そして、撹拌用容器４３の底部をその撹拌羽根と同じ傾斜の底とする。円錐状の容器の底の外面に容器の底と同じ角度を持たせた左右２極磁石４２をモーターで回す。これらの傾斜角度は、４５゜以下でないと撹拌羽根がタンクの内壁に触る可能性がある。なぜなら、吸引力の水平分力が大きくて、左右２極磁石４２のどちらかの磁極面に吸引されるからである。
吸引力の垂直分力を大きくすると、回転中心の位置を保つことができる。
【００３１】
先にも述べたが、磁気浮上現象を利用する場合、撹拌部の重量を極力少なくする必要がある。そのためには、回転軸は耐食性のある比重の軽い強靭な材料を使うと良い。また、回転軸に撹拌翼を設置しても良いが極力重さを軽減するには、被駆動磁石に耐食用の合成樹脂被覆の際に撹拌翼を形成するとよい。
撹拌翼の形成について図６で説明する。
【００３２】
図６ａは、磁気浮上した非接触回転部を液体６４の入った密閉容器６３内に収納した図である。磁気浮上磁石２と共に合成樹脂被覆で形成した撹拌翼６１と、被駆動磁石４と共に合成樹脂被覆で形成した撹拌翼６２である。
この撹拌翼は、撹拌目的に応じて、どちらか一方の撹拌翼のみを使用しても良い。
【００３３】
図６ｂは、磁気浮上した非接触回転部を液体６４の入った密閉容器６３内に収納した図である。被駆動磁石５１と共に合成樹脂被覆で形成した撹拌翼６５と円筒外周面多極磁石５３である。
これらの撹拌翼の数は、撹拌目的に応じた撹拌効果をだすために２箇所から８箇所程度の数としても良い。また接液部は耐食性の金属でも良い。
【００３４】
そして、従来方式の撹拌では、撹拌翼は一方向回転なので撹拌液が連れまわり現象のため容器内部にバッフルを付帯して撹拌効率を上げているが、洗浄性を求められる場合には問題がある。
【００３５】
本発明の被駆動磁石と駆動磁石の磁気回路であれば瞬時反転撹拌が行えるので、従来のような洗浄性の悪いバッフルを使わないでもそれ以上の撹拌効率が得られる。
【００３６】
ピン止め効果を利用する無接触軸受けは、機械的軸受けに比して外力による保持位置が移動する。
【００３７】
本実施例によると、ピン止め力は高温超電導体から遠ざかる方向の力はｍａｘ８００ｇｆ、磁気浮上磁石と真空容器外面との距離は約５ｍｍ、非接触回転部の重さは２５０ｇｆ、瞬時反転をおこなっての回転数は１３００ｒｐｍ、樹脂で被覆された撹拌翼を有する被駆動磁石と駆動磁石面（磁極面角度１０゜）の距離は１５ｍｍとして、表１からトルク４００ｇｃｍ、スラスト３５０ｇｆである。ピン止め力から非接触回転部の重さを引いた残りが５５０ｇｆである。そこで非接触回転部をセットすると２００ｇｆの保持力をもって非接触で磁気浮上した。そして１リットルの容器に２５℃の水を８５０ｃｃ用意して、粒状のインスタントコーヒーを１ｃｃ添加して溶解時間を測定した結果、２５秒で完全にとけ込んだ。
【００３８】
前記、実施例のようなバッチ式撹拌以外に連続して複数の液体を混合する場合がある。密閉容器内に連続的に複数の混合液を送り、混合槽内で接触回転機構の撹拌翼で混合し、混合された液体を連続で吐出する装置はあるが接触回転部からの汚染は避けられない。
【００３９】
高温超電導体のピン止め効果を利用する非接触回転部として、図２でもう１度その構成を説明する。磁気浮上磁石２２の外周に非磁性体２３で支持された円筒外周面多極磁石２４（モーターのローターに該当）と、その円筒外周面多極磁石２４の円周面と適宜離間してステーター２５（モーターのコイルに該当）を配設して、そのモーター機構を有するステーター２５に回転制御手段２７、２８から電気を供給すると、ピン止め力の効果が非接触軸受けとなり円筒外周面多極磁石２４（モーターのローターに該当）が回転する。
その非接触回転部を、もう１組対向させて１対１組の非接触回転装置として、各々の円筒外周面多極磁石の回転の方向を異なるようにすると、非接触連続撹拌機に利用できる。
【００４０】
非接触連続撹拌機は、図７で説明する。磁気浮上磁石２２と円筒外周面多極磁石２４を支持している非磁性体２３を撹拌羽根状に形成し、密閉容器７１内に収納する。そして、密閉容器７１の外周面と適宜離間してステーター（コイル）２５を有し、そのモーター機構を有するステーター２５に電気を供給するドライバ２６とからなる非接触回転部をもう１組対向して配設する。
【００４１】
撹拌用の密閉容器７１は、円筒状の容器とし、その円周側壁に必要数の液体を送液する入り口となるノズル７２、７３を設置し、その入り口から極力離れた円周側壁に混合された液体の出口となるノズル７４を設ける。液体の流入量と混合された液体の吐出量は実際には同量であるが、密閉容器内では内圧が掛かる方が撹拌効率がよいことが分かった。したがつて、液体の入り口の総断面積と混合された液体の出口の断面積の比は、液体の粘度に応じて１対１以下が望ましい。
【００４２】
前記、インスタントコーヒーの実験で判明したことは、瞬時反転撹拌を行うと、非接触回転部がピン止め効果の保持力に逆らって高温超電導体の方へ約１ｍｍ瞬時に往復移動する。
この現象は回転方向が急激に変わるとき、被駆動磁石の負荷が増大して駆動磁石に追従できなくなり位相差がひらき反発磁界に近づいたことを意味する。
【００４３】
この現象は、非接触で撹拌をする上で重要な課題である。撹拌中における環境変化、すなわち、予期せぬ撹拌液の粘度上昇、ピン止め効果の低減等の発生が考えられる。撹拌中に上記の要因等で非接触回転部が移動し磁気浮上磁石が高温超電導体に近づいて真空室の壁に接触したり、被駆動磁石が駆動磁石に近づき容器内壁に接触するのを防止する必要がある。
以下、予期せぬ環境変化で起きる非接触回転部の移動を管理する方法を説明する。
【００４４】
図９に示すごとく、密閉容器の蓋体９２に配設された防水保護ケース９１に収納された複数個の変位センサー１１ａ、１１ｂ（本実施例では磁気センサーを２個使用してあるが安全を確保するために３個か４個でも良い）を磁気浮上磁石近傍に配設し、磁気を検出した磁気センサー１１ａ、１１ｂは、変位制御手段１２へ信号を送り、信号を受けた変位制御手段１２は駆動源６（モーター）に指令をだすドライバ９５へ信号を送る、信号を受けたドライバ９５はモーターの回転数を回転の設定されていた値の１０％下げる。それでも信号が入ると２０％に下げる。以下、信号が入る度に１０％づつ撹拌の回転数を下げる、被駆動磁石と被駆動磁石との位相差を少なくして反発力を少なくして撹拌部の移動を押さえる。
また、変位センサーは、目的に応じて光センサーでもかまわない。
【００４５】
撹拌中に何らかの要因で被駆動磁石が離脱して、非接触回転部がすりこぎ棒が動いているような旋回運動を起こすことがある。
図８は旋回運動の軌跡近傍に磁気センサー８２を複数個配設しておき、駆動磁石５の磁界の影響が磁気センサー８２におよばないように駆動磁石５の回転外周近傍に磁気遮蔽体８１を配設して、被駆動磁石４が磁気センサー８２の近傍にくると磁気センサー８２は出力信号を制御手段である回転制御部８３へ送る。回転制御部８３は、磁気センサー８２の出力信号を受けて被駆動磁石４を元に戻すための制御出力を駆動源６に送りモーターの回転数を約５０ｒｐｍ程度に落とす、駆動磁石５の回転数が落ちると、旋回運動をしていた被駆動磁石４が磁石同志の吸引力で元の位置に戻る、事前に設定してある時間がくると、離脱した時の回転数の約１０％分落ちて撹拌を始める、再度離脱したら２０％減となり、５０％減まで５段階に回転制御部が働き非接触撹拌が続行できる。
【００４６】
【発明の効果】
以上説明したように、本発明の非接触撹拌装置によれば、真空室内に冷凍部と固着したピン止め力の強い塊状（バルク）の高温超電導体を密閉容器の開閉出来る蓋体に配設してその近傍に磁気浮上磁石を有する撹拌部を配置することで、液体または粉体等を非接触で
撹拌出来る。作業性並びに品質の向上に効果がある。
【００４７】
そして、被駆動磁石に磁気力で回転を与える駆動磁石の磁極面をＶ字形に傾斜させることによってスラスト力が少なくなり、また、円筒外周面多極磁石と円筒外周面多極磁石の構成でもスラスト力が少なくなる。その効果によって高温超電導体を小型にすることが出来、実用性が高まった。
【００４８】
また、撹拌部の回転軸方向の移動の制御は変位センサーで、被駆動磁石の離脱復帰の制御は磁気センサーで、いつも監視しながら安定した撹拌ができるようにコントロールされているので安定性のある作業ができる効果がある。
【００４９】
本発明の非接触撹拌機は、無接触で撹拌効率の良い瞬時反転撹拌が出来、発塵要素が無いのでクリーン度が高く、かつ、洗浄性に優れているので交差汚染の無い、信頼性のある撹拌作業ができるなどの効果がある。
【００５０】
非接触連続撹拌機は、化学反応の早い液体同志の場合に用いられる。各種の小量液を連続的に供給して瞬時に混合して反応させ、反応した液は連続して廃液口から吐出されるので、小型でありながら大容量の反応液を作る効果がある。
また、非接触混合のため汚染問題が解消され製品の品質が向上する効果がある。
【図面の簡単な説明】
【図１】本発明の非接触回転装置の模式的な構成図である。
【図２】本発明の非接触回転装置の模式的な構成図である。
【図３】本発明の駆動磁石である左右２極磁石の磁極面の角度を表した説明図である。
【図４】本発明の被駆動磁石が多角形をした撹拌翼機能のある一実施形態の正面断面図である。
【図５】本発明の円筒外周面多極磁石と円筒内周面多極磁石の磁気回転伝達機構に回転中心を保持するための円盤形両面２極型磁石を配設した一実施形態の正面断面図である。
【図６】本発明の非接触回転装置の一実施形態の図である。６ａの図は磁気浮上磁石と回転軸と被駆動磁石である両面２極型磁石を合成樹脂皮膜で被覆した一実施形態の断面図である。６ｂの図は磁気浮上磁石と回転軸と被駆動磁石である円筒外周面多極磁石を合成樹脂皮膜で被覆した一実施形態の断面図である。
【図７】本発明の磁気浮上のローターがステーターによって回転を与えられて撹拌を行う２組の非接触回転装置と入り口と出口を設けてある密閉容器で構成した一実施形態の正面断面図である。
【図８】本発明の被駆動磁石が離脱する作用を防止するための制御手段の一実施形態の正面断面図である。
【図９】本発明の非接触回転装置に変位センサーを設置した一実施形態の正面断面図である。
【符号の説明】
Ａ非接触回転装置
Ｂ非接触回転部
１高温超電導体
２磁気浮上磁石
３回転軸
４被駆動磁石
５駆動磁石
６駆動源
７真空室
８冷凍部
１１ａ、１１ｂ変位センサー
１２変位制御手段[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a non-contact rotating device using a non-contact levitation phenomenon between a high-temperature superconductor and a permanent magnet.
[0002]
[Prior art]
As a prior art, a vacuum pump or the like is commercially available as a magnetic levitation bearing using the repulsion of a permanent magnet.
Japanese Patent No. 2673462, the title of the invention, and a non-contact stirring device are published.
[0003]
[Problems to be solved by the invention]
The magnetic levitation bearing used in the conventional vacuum pump has a complicated structure and is not suitable for a device for stirring liquid.
[0004]
In the non-contact stirrer of the patent, if the superconducting cylinder is frozen and the container inside it is heat-insulated, the distance from the magnet, which is a stirring blade, increases, and the pinning force increases as the diameter of the stirring container increases. To decrease. Moreover, in order to give the stirring blade the rotational torque for stirring from the solenoid coil of the rotational drive source, the size becomes large and there is a problem in practical use.
[0005]
By the way, in a pharmaceutical production line, when one chemical is finished, when the container is washed and another pharmaceutical is produced, if the washing is not sufficient, the previous medicine may be mixed into the subsequent medicine, and a severe crossing will occur. Contamination measures are desired. For this purpose, an apparatus capable of non-contact stirring in a closed container and having excellent cleanability in the container is desired.
In the semiconductor manufacturing field, it is a different industry from pharmaceutical manufacturing, but it has technical commonality with respect to contamination.
Further, in the industry, a non-contact continuous stirrer is desired in which liquids to be mixed are continuously supplied and the mixed liquid is continuously discharged.
[0006]
This invention is made | formed in view of such a situation, and it aims at providing the non-contact rotating apparatus using the magnetic levitation phenomenon, and the non-contact stirring apparatus which applied the non-contact rotating apparatus.
[0007]
[Means for Solving the Problems]
In the non-contact rotating device according to the first invention, means for solving the above-described problems are configured as follows. In other words, a massive high-temperature superconductor with a strong pinning force fixed to the freezer in the vacuum chamber, a magnetic levitation magnet facing away from the high-temperature superconductor, and a rotating shaft coupled to one end of the magnetic levitation magnet And a non-contact rotating part composed of a driven magnet that is rotated by a magnetic force coupled to the other end of the rotating shaft, and is disposed at an appropriate distance from the driven magnet. Displacement sensor that consists of a drive magnet that gives rotation and a drive source, and that detects and outputs the displacement of the rotating shaft moving in the length direction of the shaft, and the displacement of the non-contact rotating part in response to the output signal of the displacement sensor Displacement control means for controlling is provided.
[0008]
The second invention is a massive high-temperature superconductor having a strong pinning force fixed to the freezing section in the vacuum chamber, a magnetic levitation magnet facing away from the high-temperature superconductor through a part of the vacuum chamber, A stator having a motor mechanism having a cylindrical outer peripheral surface multipole magnet supported by a nonmagnetic material on the outer periphery of a magnetically levitated magnet and a circumferential surface of the cylindrical outer peripheral surface multipole magnet appropriately separated from each other. A non-contact rotating unit including a driver for supplying electricity to the non-contact rotating unit, and another set of the non-contact rotating units is opposed to each other to form a one-to-one set non-contact rotating device.
[0009]
The third invention is a double-sided dipole magnet of a driven magnet that is fixed to the other end of the rotating shaft and rotates with a magnetic force, and is fixed to the rotating shaft of the drive source that rotates the driven magnet with a magnetic force. The drive magnet that is driven to rotate is a left-right 2 having a portion near one end in the longitudinal direction of one surface of the V shape in the longitudinal direction as a magnetic pole of one pole and a portion near the other end in the longitudinal direction of the one surface as a magnetic pole of the other pole. The angle formed by the magnetic pole surfaces of the left and right bipolar magnets is a plane perpendicular to the rotation center extension of the double-sided bipolar magnet, and one of the left and right bipolar magnets is The angle of the pole face of the pole is 1 ° to 45 °, and the angle of the pole face of the other pole is 1 ° to 45 °.
[0010]
According to a fourth aspect of the present invention, in a driven magnet fixed to the other end of the rotating shaft and rotated by a magnetic force, the entire surface that is parallel to the longitudinal direction is a magnetic pole of one pole, and the surface opposite to the surface The magnetic pole surface of a double-sided two-pole magnet having the entire back surface as the other magnetic pole is a polygonal (home base) or trapezoidal driven magnet on the rotation center extension line of the driven magnet. The rotation angle of the driving magnet is aligned, and the arrangement angle and position of the magnetic pole surface of the left and right bipolar magnets in the longitudinal direction of the driving magnet are the same as the inclination angle of the rotating outer peripheral inclined surface of the driven magnet, They are spaced apart as appropriate.
That is, a combination of using a double-sided bipolar magnet as a driven magnet and a left and right bipolar magnet as a driving magnet increases the rotational force and reduces the thrust force.
[0011]
In the fifth invention, when the pinning force of the high-temperature superconducting device is used, it is necessary to reduce the thrust force in the rotation axis direction in the rotation drive system as much as possible.
A disk-type double-sided dipole magnet is arranged at the position of the driven magnet on the rotation axis center extension line of the non-contact rotating part, and the outer peripheral surface of the disk-type double-sided dipole magnet is supported by a nonmagnetic material. A cylindrical inner surface multipole magnet provided with a pole magnet, a disc-type double-sided dipole magnet provided at the tip of the drive rotating shaft, and supported by a non-magnetic material on the outer periphery of the disc-type double-sided dipole magnet, The cylinder outer circumferential surface multipole magnet is appropriately spaced apart.
[0012]
According to a sixth aspect of the present invention, when a non-contact rotating device is applied to a non-contact agitating device, a magnetic levitation magnet and a rotating shaft that are held in an open container or a closed container for containing a liquid to be agitated and held by a pinning force In order to reduce the weight of the non-contact rotating part consisting of the magnet and the driven magnet, the magnetic levitation magnet or the driven magnet is coated with a synthetic resin in the shape of a stirring wing without using a separate stirring blade Alternatively, the magnetically levitated magnet and the driven magnet are coated with a synthetic resin in the shape of a stirring blade. The stirring blade is not limited to a synthetic resin but is formed of a nonmagnetic metal coating.
[0013]
According to a seventh aspect of the present invention, the container for continuous stirring is a sealed container, and includes an appropriate number of supply ports for feeding the liquid to be stirred and an appropriate number of discharge ports for discharging the liquid after the stirring process, one-to-one pair. A high-temperature superconducting device and a one-to-one set of non-contact stirring device are provided.
[0014]
According to an eighth aspect of the present invention, when a driven magnet is detached for some reason during agitation to cause a turning motion (movement like a pestle bar), a plurality of magnetic sensors are arranged near the locus of the turning motion. When the driven magnet comes near the magnetic sensor, the magnetic sensor detects the magnetism of the driven magnet and sends an output signal to the rotation control unit. The rotation control unit receives the output signal of the magnetic sensor and sends a control output for returning the driven magnet to the drive source.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a non-contact rotating device according to the present invention will be described below with reference to the drawings.
FIG. 1 shows a schematic configuration of a non-contact rotating device, A is a non-contact rotating device, B is a non-contact rotating portion, 1 is a refrigerated high-temperature superconductor, 2 is a magnetic levitation magnet, and 3 is a magnetic levitation A rotating shaft for connecting the magnet and the driven magnet, 4 a driven magnet having a stirring blade, 5 a driving magnet for rotating the driven magnet by magnetic force, 6 a driving source for rotating the driving magnet, and 7 a heat transfer , A freezing unit, 11a and 11b are displacement sensors, and 12 is a displacement control means.
[0016]
In such a non-contact rotating device, it is important for practical use to maximize the pinning force composed of the high-temperature superconductor and the magnetic levitation magnet.
According to the embodiment, a thick disk (bulk) of the yttrium-type high-temperature superconductor of the second type superconductor is fixed to the freezing section of the pulse tube refrigerator, and a vacuum chamber is provided to block heat conduction.
The refrigeration means is not limited to the pulse tube refrigerator, and liquid nitrogen or the like may be used as long as about 90K can be maintained.
[0017]
Freezing is started while a magnetically levitated magnet is brought into close contact with the high-temperature superconductor through the outer wall of the vacuum chamber and evacuated.
When the degree of vacuum reaches about 10 @ -6 Torr and the freezing temperature reaches about 90K (-183 DEG C.) below the critical temperature, the magnetic levitation magnet is removed.
When the magnetic levitation magnet is again brought close to the high temperature superconductor by hand, a repulsive force is received at a position away from the high temperature superconductor, and when the hand is released at that position, it floats in the space.
This position is the position where the high-temperature superconductor is stored in the magnetic levitation magnet.
If the magnetic levitation magnet is moved left or right by hand, it will return to the stored position, if it is moved upward, it will receive a repulsive force, and if it moves downward, it will receive an attractive force and return to its original position. This is the pinning force effect. The levitation position differs depending on the weight of an element attached to the magnetic levitation magnet.
It also differs depending on the position of the levitation magnet and the high-temperature superconductor in the direction of gravity.
[0018]
In the case of the same magnetic field, when the magnetic levitation magnet is on the high-temperature superconductor, the gravity force of the magnetic levitation magnet is applied and the magnetic levitation magnet is displaced in the direction approaching the high-temperature superconductor, so the pinning holding force is strengthened by Coulomb's law. . On the other hand, when the magnetic levitation magnet is under the high-temperature superconductor, the pinning force is weakened because it tends to move away due to gravity.
Therefore, it is preferable for practical use that the magnetic levitation magnet is on the high-temperature superconductor.
[0019]
For driven magnets and drive magnets that rotate by magnetic force, due to the nature of the pinning force of the magnetically levitated magnet and high-temperature superconductor described earlier, the attractive action (thrust force) is removed as much as possible, and the magnetic force is reduced to the rotational force ( Rotation torque).
By configuring the magnetic circuit of the inventor's magnetic rotation transmission device (Japanese Patent No. 2,678,569), it is preferable to use an action in which the attractive force decreases as the load is applied to the driven magnet (within the limit).
[0020]
The magnetic circuit of the inventor's magnetic rotation transmission device was constructed and tested, and as a result, the driven magnet and the driving magnet could not be held with a pinning effect unless they were separated from each other. This is because the thrust force due to the suction force is strong. Therefore, various experiments were conducted.
[0021]
FIG. 3 is a diagram for explaining how to determine the inclination angle of the magnetic pole surface of the drive magnet.
The surface perpendicular to the rotation center extension line 31 will be described with the angle reference surface 32 of the magnetic pole face as 0 °.
Experiment on distance characteristics between magnet surfaces.
Table 1 shows the measurement results of a characteristic experiment of the distance between the magnet surfaces of the conventional drive magnet (inclination angle 0 °) and the magnetic pole surface inclination angles 10 ° and 40 ° of the present invention.
As experimental conditions, the conventional driving magnet and the driving magnet of the present invention use the same magnet, and in the case of an inclined magnetic pole surface, the straight line connecting the center of the left and right magnetic pole surfaces and the opposing surface of the driven magnet are set as the set distance. did.
Hereinafter, the distance characteristics between the conventional drive magnet and the drive magnet of the present invention (two kinds of tilt angles) will be described.
[0022]
At a distance of 0 mm, the maximum torque of the conventional drive magnet (tilt angle 0 °) is 2700 gcm, whereas the maximum torque of the drive magnet of the present invention at the tilt angle 10 ° is 2800 gcm, which is 100 gcm higher. The maximum thrust is reduced by 1300 gf and 200 gf to 1500 gf.
Hereinafter, at 5 mm, the maximum torque is 200 gcm more and the maximum thrust is 50 gf less.
[0023]
Considering the tilt angle of 40 ° of the driving magnet of the present invention, the conventional torque is 2300 gcm with respect to 2700 gcm. However, when the distance is 5 mm, the torque is 1200 gcm in both the conventional and the present invention, the distance is 10 mm, 15 mm, At 20 mm, the values are almost the same.
From the above, the tilt angle of the drive magnet having a large torque and a small thrust is most effective in the vicinity of 10 ° of the present invention than the conventional 0 °.
[Table 1]

It has been found that the drive magnet of the present invention increases the rotational torque and reduces the thrust force compared to the conventional drive magnet.
However, this experiment finds characteristics in the magnetic circuit of the present invention, and a distance of 0 mm between the magnetic poles is not practical. The practical application is 1 mm or more.
That is, it has been found that the effective distance between the driving magnet and the driven magnet of the present invention is around 5 mm.
[0024]
Magnetic pole face angle characteristic experiment.
Table 2 shows the measurement results of characteristic experiments of the conventional drive magnet (inclination angle 0 °) and the magnetic pole surface inclination angles of 10 °, 20 °, 30 ° and 40 ° of the present invention.
The experimental conditions were the same for all magnets, and the distance between the two magnets was set by sandwiching a 10 mm non-magnetic plate between the driving magnet of the present invention and the conventional driven magnet.
The characteristics of the conventional drive magnet and the drive magnet of the present invention (four kinds of tilt angles) will be described below with reference to Table 2.
[0025]
The maximum torque of the conventional drive magnet (tilt angle 0 °) is 600 gcm, while the maximum torque of the drive magnet (tilt angle 10 °) of the present invention is the same as 600 gcm, but the maximum thrust is reduced by 500 gf and 100 gf. . Hereinafter, at the tilt angles of 20 °, 30 ° and 40 ° of the drive magnet of the present invention, although the thrust value is decreased, the torque is also decreased at the same time. As a result, the tilt angle of the drive magnet is Around 10 ° is the most effective. This experiment was conducted for practical use.
[Table 2]

As described above, the results of the magnet surface distance characteristic experiment (Table 1) and the magnetic pole surface angle characteristic experiment (Table 2) are summarized. In the combination of the driving magnet and the driven magnet of the prior art, the driving magnet of the present invention When the angle is in the range of about 10 ° plus 5 ° centered on about 10 °, the distance is about 5 mm plus 5 mm minus 3 mm as a guideline for practical use.
[0026]
If the angle of the magnetic pole face used in the experiment is 90 °, a conventional radial coupling is obtained. Therefore, the results of experiments with a combination of conventional radial couplings. The driven magnet could not hold the center of rotation, resulting in rubbing the inner wall of the container.
[0027]
Therefore, the configuration of a non-contact stirrer to which a radial coupling is applied will be described with reference to FIG.
[0028]
A disk-type double-sided dipole magnet 51 is disposed on the other end of the magnetically levitated magnet on the center extension line of the rotating shaft 3 of the non-contact rotating part, and a non-magnetic body 52 is provided on the outer periphery of the disk-type double-sided dipole magnet 51. A supported cylindrical outer circumferential surface multipolar magnet 53 is disposed, a disk-type double-sided dipole magnet 54 is disposed at the tip of the drive rotating shaft 59, and supported by a non-magnetic material 55 on the outer periphery of the disk-type double-sided dipole magnet. The cylindrical inner peripheral surface multipole magnet 56 is disposed through the side wall of the container 57 containing the cylindrical outer peripheral surface multipolar magnet 53 and the liquid 58.
[0029]
In this way, the center of rotation can be maintained by the attractive action of the central magnets. In order to maintain the center more strongly, it is preferable that each suction action surface has a conical shape with a truncated head. By maintaining the center of rotation in this way, the inner magnet of the radial coupling can be stirred without being eccentric.
[0030]
Next, the present invention having characteristics intermediate between those of a conventional magnetic circuit having a magnetic pole face of 0 ° and a conventional radial coupling magnetic circuit will be described with reference to FIG.
The driven magnet 41 is a double-sided bipolar magnet, and the magnetic pole surface is polygonal (home base shape) or trapezoidal plate shape, fixed to the tip of the rotating shaft 3, covered with synthetic resin, etc., and used as it is as a stirring blade. . And let the bottom part of the container 43 for stirring be the bottom of the same inclination as the stirring blade. A left and right dipole magnet 42 having the same angle as the bottom of the container on the outer surface of the bottom of the conical container is rotated by a motor. If these inclination angles are not less than 45 °, the stirring blades may touch the inner wall of the tank. This is because the horizontal component of the attractive force is large and is attracted to one of the magnetic pole surfaces of the left and right dipole magnets 42.
If the vertical component of the suction force is increased, the position of the rotation center can be maintained.
[0031]
As described above, when the magnetic levitation phenomenon is used, it is necessary to reduce the weight of the stirring unit as much as possible. For that purpose, it is good to use a tough material with specific gravity and light weight for the rotating shaft. In addition, a stirring blade may be installed on the rotating shaft, but in order to reduce the weight as much as possible, it is preferable to form the stirring blade when the driven magnet is coated with a synthetic resin for corrosion resistance.
The formation of the stirring blade will be described with reference to FIG.
[0032]
FIG. 6 a is a diagram in which the non-contact rotating part magnetically levitated is accommodated in the sealed container 63 containing the liquid 64. A stirring blade 61 formed of a synthetic resin coating together with the magnetic levitation magnet 2 and a stirring blade 62 formed of a synthetic resin coating together with the driven magnet 4.
Only one of these stirring blades may be used depending on the purpose of stirring.
[0033]
FIG. 6 b is a diagram in which the non-contact rotating part magnetically levitated is accommodated in the sealed container 63 containing the liquid 64. These are a stirring blade 65 and a cylindrical outer peripheral surface multipolar magnet 53 formed with a synthetic resin coating together with the driven magnet 51.
The number of these stirring blades may be about 2 to 8 in order to produce a stirring effect according to the purpose of stirring. The liquid contact portion may be a corrosion resistant metal.
[0034]
In the conventional stirring, since the stirring blade rotates in one direction, the stirring solution is accompanied by a baffle inside the vessel to increase the stirring efficiency. However, there is a problem when cleaning performance is required. .
[0035]
Since the magnetic circuit of the driven magnet and the driving magnet according to the present invention can perform instantaneous inversion stirring, even if a baffle having a poor cleaning property as in the prior art is not used, higher stirring efficiency can be obtained.
[0036]
Non-contact bearings that use the pinning effect move their holding positions due to external forces as compared to mechanical bearings.
[0037]
According to this embodiment, the pinning force is a maximum force of 800 gf in the direction away from the high temperature superconductor, the distance between the magnetic levitation magnet and the outer surface of the vacuum vessel is about 5 mm, the weight of the non-contact rotating part is 250 gf, and instantaneous reversal is performed. The rotational speed of the motor is 1300 rpm, the distance between the driven magnet having a stirring blade coated with resin and the driving magnet surface (magnetic pole surface angle 10 °) is 15 mm, and the torque is 400 gcm and the thrust is 350 gf from Table 1. The remainder obtained by subtracting the weight of the non-contact rotating part from the pinning force is 550 gf. Therefore, when the non-contact rotating part was set, it magnetically levitated in a non-contact manner with a holding force of 200 gf. Then, 850 cc of 25 ° C. water was prepared in a 1 liter container, 1 cc of granular instant coffee was added, and the dissolution time was measured. As a result, it completely melted in 25 seconds.
[0038]
In some cases, a plurality of liquids may be continuously mixed in addition to the batch-type stirring as in the above-described embodiment. Although there are devices that continuously feed a plurality of mixed liquids into an airtight container, mix them with a stirring blade of a contact rotation mechanism in a mixing tank, and continuously discharge the mixed liquid, contamination from the contact rotation part can be avoided. Absent.
[0039]
As a non-contact rotating part that utilizes the pinning effect of the high-temperature superconductor, its configuration will be described again with reference to FIG. A cylindrical outer peripheral multipole magnet 24 (corresponding to a rotor of a motor) supported by a nonmagnetic material 23 on the outer periphery of the magnetic levitation magnet 22 and a circumferential surface of the cylindrical outer peripheral multipolar magnet 24 are appropriately separated from the stator 25. (Equivalent to the motor coil) and when electricity is supplied from the rotation control means 27 and 28 to the stator 25 having the motor mechanism, the effect of the pinning force becomes a non-contact bearing and the cylindrical outer circumferential surface multipolar magnet 24 (Applicable to the motor rotor) rotates.
If the rotation direction of each cylindrical outer circumferential surface multipole magnet is made different as a one-to-one set non-contact rotating device with the other non-contact rotating part facing each other, it can be used for a non-contact continuous stirrer. .
[0040]
The non-contact continuous stirrer will be described with reference to FIG. A non-magnetic material 23 supporting the magnetic levitation magnet 22 and the cylindrical outer circumferential surface multipolar magnet 24 is formed in a stirring blade shape and stored in the sealed container 71. Then, another set of non-contact rotating parts including a stator (coil) 25 that is appropriately spaced from the outer peripheral surface of the sealed container 71 and a driver 26 that supplies electricity to the stator 25 having the motor mechanism are opposed to each other. Arrange.
[0041]
The agitation sealed container 71 is a cylindrical container, and

nozzles

72 and 73 serving as inlets for feeding a necessary number of liquids are installed on the circumferential side wall thereof, and mixed on the circumferential side wall as far as possible from the inlet. A nozzle 74 serving as a liquid outlet is provided. It was found that the discharge amount of the mixed liquid and the discharge amount of the mixed liquid is actually the same, but the stirring efficiency is better when the internal pressure is applied in the sealed container. Accordingly, the ratio of the total cross-sectional area of the liquid inlet to the cross-sectional area of the mixed liquid outlet is preferably 1: 1 or less depending on the viscosity of the liquid.
[0042]
What was found in the instant coffee experiment is that, when instantaneous reversal stirring is performed, the non-contact rotating part reciprocates instantaneously about 1 mm toward the high-temperature superconductor against the holding force of the pinning effect.
This phenomenon means that when the rotation direction changes suddenly, the load of the driven magnet increases, the follower cannot follow the driving magnet, the phase difference opens, and the repulsive magnetic field approaches.
[0043]
This phenomenon is an important issue when stirring without contact. It is conceivable that the environment changes during stirring, that is, the viscosity of the stirring liquid unexpectedly increases and the pinning effect decreases. Prevents the non-contact rotating part from moving due to the above factors during agitation and the magnetic levitation magnet from approaching the high-temperature superconductor to contact the vacuum chamber wall, or the driven magnet from approaching the drive magnet and contacting the inner wall of the container. There is a need to.
Hereinafter, a method for managing the movement of the non-contact rotating part caused by an unexpected environmental change will be described.
[0044]
As shown in FIG. 9, a plurality of displacement sensors 11a and 11b housed in a waterproof protective case 91 disposed on the lid 92 of the sealed container (in this embodiment, two magnetic sensors are used, but safety is ensured. 3 or 4 may be provided in the vicinity of the magnetic levitation magnet, and the magnetic sensors 11a and 11b that detect magnetism send signals to the displacement control means 12 and receive the signals. Sends a signal to the driver 95 which gives a command to the drive source 6 (motor). Upon receiving the signal, the driver 95 lowers the rotation speed of the motor by 10% of the value set for the rotation. Still, when the signal is received, it is reduced to 20%. Hereinafter, every time a signal is input, the rotation speed of stirring is decreased by 10%, the phase difference between the driven magnet and the driven magnet is reduced, the repulsive force is reduced, and the movement of the stirring portion is suppressed.
The displacement sensor may be an optical sensor depending on the purpose.
[0045]
During the agitation, the driven magnet may come off for some reason, and the non-contact rotating part may cause a swiveling motion such that the pestle is moving.
In FIG. 8, a plurality of magnetic sensors 82 are arranged in the vicinity of the trajectory of the turning motion, and a magnetic shield 81 is provided in the vicinity of the rotating outer periphery of the drive magnet 5 so that the influence of the magnetic field of the drive magnet 5 does not affect the magnetic sensor 82. When the driven magnet 4 is disposed in the vicinity of the magnetic sensor 82, the magnetic sensor 82 sends an output signal to the rotation control unit 83 which is a control means. The rotation control unit 83 receives the output signal of the magnetic sensor 82 and sends a control output for returning the driven magnet 4 to the drive source 6 to reduce the rotation speed of the motor to about 50 rpm. Falls, the driven magnet 4 that has been swiveling returns to its original position with the attractive force of the magnets. When a preset time arrives, the rotational speed drops by approximately 10%. When stirring is started again, it is reduced by 20% when it is separated again, and the non-contact stirring can be continued by operating the rotation control unit in five stages until the reduction by 50%.
[0046]
【The invention's effect】
As described above, according to the non-contact agitation apparatus of the present invention, a bulky high-temperature superconductor having a strong pinning force fixed to the refrigeration unit in the vacuum chamber is disposed on the lid that can open and close the sealed container. By arranging a stirring unit having a magnetic levitation magnet in the vicinity thereof, liquid or powder can be stirred without contact. Effective in improving workability and quality.
[0047]
Further, the thrust force is reduced by inclining the magnetic pole surface of the driving magnet that applies rotation to the driven magnet in a V shape, and the thrust is reduced even in the configuration of the cylindrical outer peripheral surface multipolar magnet and the cylindrical outer peripheral surface multipolar magnet. Power is reduced. As a result, the high-temperature superconductor can be made smaller, and its practicality has increased.
[0048]
In addition, the movement of the stirrer in the direction of the rotation axis is controlled by a displacement sensor, and the control of detachment and return of the driven magnet is controlled by a magnetic sensor. There is an effect to work.
[0049]
The non-contact stirrer of the present invention is capable of instantaneous reversal stirring with no contact and good stirring efficiency, has no dust generation element, has a high degree of cleanness, and has excellent cleanability, so there is no cross-contamination and reliability. There is an effect that a certain stirring work can be performed.
[0050]
A non-contact continuous stirrer is used in the case of liquids having a fast chemical reaction. Various small-volume liquids are continuously supplied, mixed and reacted instantaneously, and the reacted liquid is continuously discharged from the waste liquid port, so that there is an effect of producing a large-capacity reaction liquid while being small.
In addition, the non-contact mixing eliminates the contamination problem and improves the product quality.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a non-contact rotating device according to the present invention.
FIG. 2 is a schematic configuration diagram of a non-contact rotating device according to the present invention.
FIG. 3 is an explanatory view showing an angle of a magnetic pole surface of a left and right dipole magnet which is a drive magnet of the present invention.
FIG. 4 is a front sectional view of an embodiment of the driven magnet of the present invention having a polygonal stirring blade function.
FIG. 5 is a front view of an embodiment in which a disc-shaped double-sided two-pole magnet for holding the center of rotation is disposed in the magnetic rotation transmission mechanism of the cylindrical outer peripheral surface multipole magnet and the cylindrical inner peripheral surface multipole magnet of the present invention. It is sectional drawing.
FIG. 6 is a diagram of one embodiment of a non-contact rotating device of the present invention. 6a is a cross-sectional view of an embodiment in which a magnetic levitation magnet, a rotating shaft, and a double-sided bipolar magnet as a driven magnet are covered with a synthetic resin film. FIG. 6b is a cross-sectional view of an embodiment in which a magnetically levitated magnet, a rotating shaft, and a cylindrical outer peripheral multipolar magnet as a driven magnet are covered with a synthetic resin film.
FIG. 7 is a front cross-sectional view of an embodiment in which the magnetic levitation rotor of the present invention is composed of two sets of non-contact rotating devices that are rotated by a stator and agitated, and a sealed container having an inlet and an outlet. is there.
FIG. 8 is a front sectional view of an embodiment of a control means for preventing the driven magnet of the present invention from being separated.
FIG. 9 is a front sectional view of an embodiment in which a displacement sensor is installed in the non-contact rotation device of the present invention.
[Explanation of symbols]
A Non-contact rotator B Non-contact rotator 1 High-temperature superconductor 2 Magnetic levitation magnet 3 Rotating shaft 4 Driven magnet 5 Drive magnet 6 Drive source 7 Vacuum chamber 8 Freezing unit 11a, 11b Displacement sensor 12 Displacement control means

Claims

An open or closed container for the liquid to be stirred;
An agitation unit for agitating the liquid put in the container, the agitation unit comprising a magnetic levitation magnet, a driven magnet, and a rotating shaft connecting them, and the magnetic levitation magnet faces upwardly A stirring unit installed in the container so that the
A massive high-temperature superconductor provided in a vacuum chamber provided at the top of the container and having a strong pinning force fixed to the refrigeration unit, wherein the magnetic levitation magnet of the stirring unit is pinned by the pinning force. , A high-temperature superconductor that floats the stirring unit in the container;
Provided on the outside of the bottom of the container, the rotation drive source and the rotation of the rotation drive source are transmitted to the driven magnet of the floating stirring unit by magnetic force to rotate the stirring unit around the rotation axis A driving magnet
A displacement sensor for detecting an axial displacement of the rotating shaft of the stirring unit;
A non-contact agitation device comprising: a displacement control means for controlling the axial displacement of the rotating shaft by adjusting a rotational force by applying a detection signal of the displacement sensor to the rotation drive source .

In the vicinity of the outer periphery of the drive magnet, a magnetic shield that shields the magnetic field from the drive magnet to the magnetic sensor, a magnetic sensor that detects that the driven magnet has been detached, and a detection signal of the magnetic sensor is rotationally driven. The non-contact agitation device according to claim 1, further comprising a control means for adjusting the rotational force in addition to the source to control the driven magnet to return to the original position .

The non-contact stirring apparatus according to claim 1 or 2, wherein the displacement sensor is housed in a waterproof protective case and disposed in the container in the vicinity of the magnetic levitation magnet .

The driven magnet is composed of a double-sided bipolar magnet in which the entire surface that is parallel to the longitudinal direction is the magnetic pole of one pole, and the entire back surface that is the opposite surface is the magnetic pole of the other pole. ,
The driving magnet has substantially the same length as the double-sided bipolar magnet, and a portion near one end in the longitudinal direction of one surface inclined in a V shape in the longitudinal direction is used as a magnetic pole of one pole, and the longitudinal length of the one surface It consists of left and right dipole magnets with the other end in the direction near the other pole,
The angle formed by the V-shaped magnetic pole surface of the left and right bipolar magnet is orthogonal to the rotation center extension line of the double-sided bipolar magnet, and the magnetic pole of one pole of the left and right bipolar magnet 4. The non-contact surface according to claim 1, wherein the angle of the surface is 1 ° to 45 ° from the reference surface, and the angle of the magnetic pole surface of the other pole is 1 ° to 45 ° from the reference surface. Contact stirring device .

The magnetic pole surface of the double-sided bipolar magnet constituting the driven magnet is formed in a polygon (home base shape) or trapezoidal shape, and the rotation center of the drive magnet is aligned with the rotation center extension line of the driven magnet. The arrangement angle and position of the magnetic pole surface of the left and right bipolar magnet inclined in a V shape in the longitudinal direction of the driving magnet are the same as the inclination angle of the rotating outer peripheral inclined surface of the driven magnet and are appropriately separated from each other. The non-contact stirring apparatus according to claim 4, wherein

Either the magnetic levitation magnet or the driven magnet is coated with a synthetic resin in the shape of a stirring wing, or the magnetic levitation magnet and the driven magnet are coated with a synthetic resin in the shape of a stirring wing. The non-contact stirring apparatus according to any one of claims 1 to 5 .

A sealed container for containing the liquid for stirring;
An appropriate number of sample supply ports provided in the sealed container and supplying the liquid into the sealed container; and a sample discharge port for discharging the liquid after the stirring process to the outside of the sealed container;
First and second agitating units for agitating the liquid stored in the upper part and the lower part of the sealed container, respectively, comprising a magnetic levitation magnet and a non-magnetic substance around the magnetic levitation magnet as a center. And a cylindrical outer surface multipole magnet in which different magnetic poles are alternately arranged in a cylindrical shape, and the magnetic pole surface of the magnetic levitation magnet faces up and down, and the magnetic pole surface of the cylindrical outer surface multipole magnet is First and second stirring units installed in the container so as to face the radial direction of the cylinder;
A massive high-temperature superconductor provided in vacuum chambers provided at the upper and lower portions of the container and having a strong pinning force fixed to the freezing section, wherein the magnetic levitation magnets of the first and second stirring sections are First and second high-temperature superconductors that cause the first and second stirring portions to float in the container by pinning with the pinning force;
In order to rotate the first and second stirrers around the magnetically levitated magnet using the cylindrical outer surface multipolar magnets of the first and second stirrers levitated by the high temperature superconductor as a rotor First and second stators provided on the outer periphery of the container and appropriately spaced from the cylindrical outer circumferential surface multipole magnet;
First and second drivers for supplying electricity to the first and second stators;
A non-contact stirrer equipped with .