JP3919508B2 - Liquid processing equipment - Google Patents

Liquid processing equipment Download PDF

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Publication number
JP3919508B2
JP3919508B2 JP2001352212A JP2001352212A JP3919508B2 JP 3919508 B2 JP3919508 B2 JP 3919508B2 JP 2001352212 A JP2001352212 A JP 2001352212A JP 2001352212 A JP2001352212 A JP 2001352212A JP 3919508 B2 JP3919508 B2 JP 3919508B2
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liquid
vortex pump
vortex
tank
pump
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JP2003145139A (en
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荘一郎 大崎
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Nikuni KK
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Nikuni KK
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Description

【0001】
【発明の属する技術分野】
本発明は、沈澱性粒子を含む液を処理する液処理装置に関する。
【0002】
【従来の技術】
例えば、図4に示されるように、塗装ノズル11から噴霧された塗料ミスト12の周囲拡散を防止するための塗装用ベンチュリブース13がある。
【0003】
この塗装用ベンチュリブース13は、ブース本体14の下部に液槽15を備え、この液槽15上に塗装空間16と回収空間17とを仕切るための仕切板18が、液面19に対する吸引間隙20を介して設けられ、回収空間17内には複数の邪魔板21,22,23が交互に配置され、回収空間17上のブース本体上部には排気ファン24が設けられている。
【0004】
そして、塗装ノズル11から噴霧された塗料ミスト12は、排気ファン24の吸引力により、空気とともに塗装空間16から吸引間隙20を経て回収空間17に吸引され、その際に、最下部の邪魔板21により下向きの力が与えられ、空気から分離して液面19に叩き付けられ、捕集される。一方、空気は、排気ファン24の吸引力で上昇して、外部へ排気される。
【0005】
このようにして、液面19に叩き付けられ捕集された塗料粉は、沈澱性粒子であるから、時間の経過とともに液槽15内に沈澱し、汚泥状のスラッジとして堆積する。
【0006】
【発明が解決しようとする課題】
この液は、腐敗して悪臭が発生するので、沈澱堆積したスラッジを定期的に除去しているが、いったん液槽15の底部に沈澱して堆積したスラッジを掻出す作業は大変な困難を伴い、手間と費用を要する問題がある。
【0007】
本発明は、このような点に鑑みなされたもので、液中の沈澱性粒子を沈澱堆積させずに回収できる液処理装置を提供することを目的とするものである。
【0008】
【課題を解決するための手段】
請求項に記載された発明は、沈澱性粒子を含む液が収容された液槽と、この液槽内の液を循環させるとともに液中に微細な気泡を発生させる渦流ポンプユニットと、気泡により液面に浮上した沈澱性粒子を回収する回収手段とを具備し、前記渦流ポンプユニットは、渦流ポンプと、この渦流ポンプ内の液吸込部に挿入された空気吸込管とを備え、前記渦流ポンプは、前記液吸込部から吸込まれた液と前記空気吸込管から前記液吸込部に吸込まれた空気とが内部で生じる渦流によって攪拌されることで微細な気泡が作られる構造を有し、前記空気吸込管中に設けられた管路開閉用の電磁弁と、前記渦流ポンプの吐出口から吐出された液流れを検知して前記電磁弁を開く液流れ検知手段とを具備した液処理装置であり、このような構成を採用したことにより、渦流ポンプの液吸込部に液が吸込まれる際に、空気吸込管から液吸込部に空気も吸込まれ、液と空気とが渦流ポンプ内で生じる渦流によって十分に攪拌されるので、微細な気泡を効率良く製造できるとともに、液中の溶存酸素量を効率良く増加させることができる渦流ポンプユニットを用いて、この渦流ポンプユニットから液槽の液中に微細な気泡を多量に供給し、微量な気泡を液中の沈澱性粒子に結合させて沈澱性粒子を液面に浮上させ、浮上した沈澱性粒子を回収手段により回収するので、液中の沈澱性粒子を液槽内に沈澱堆積させずに回収できる。同時に、微細な気泡の供給により、液中の溶存酸素量が増加するため、悪臭源である嫌気性バクテリアの発生が抑制され、液の腐敗によって発生する悪臭を抑えることができるとともに、溶存酸素による液浄化の効果により液寿命が延長するため、液処理に要する費用を低減できる。また、ポンプ起動時は、電磁弁を閉じて、空気吸込管からの空気吸込を阻止することで、渦流ポンプは液を効率良く吸込んで短時間のうちにポンプ内部の空気を液と置換するので、ポンプシール部などの損傷を招くドライ運転を防止でき、また、渦流ポンプ内に液がいきわたって吐出されたときに、その液流れを検知した液流れ検知手段により電磁弁を開くことで、渦流ポンプの液吸込部に吸込まれる液中に空気吸込管から空気を混入させる運転へと自動的に切換えることができ、渦流ポンプを液槽より上側に設置するなどの、ポンプ設置条件が吸上げ条件の場合にも対応できる。
【0009】
請求項2に記載された発明は、請求項1記載の液処理装置における液槽が、塗料ミストを排気ファンにより吸引する過程で液面にて捕集する塗装用ベンチュリブースの下部に設けられたものであり、渦流ポンプユニットから塗装用ベンチュリブースの液中に微細な気泡を多量に供給し、微細な気泡を液中の塗料粉に結合させて塗料粉を液面に浮上させ、浮上した塗料粉を回収手段により回収するので、液中の塗料粉を塗装用ベンチュリブースの液槽内に沈澱堆積させずに回収でき、同時に、空気の注入により、液中の溶存酸素量が増加するため、悪臭源である嫌気性バクテリアの発生が抑制され、塗装用ベンチュリブースから液の腐敗によって発生する悪臭を抑えることができる。
【0010】
請求項3に記載された発明は、請求項2記載の液処理装置において、渦流ポンプユニットおよび回収手段は、塗装用ベンチュリブースの排気ファン停止時に稼働させるものであり、塗装用ベンチュリブースの排気ファン停止時は、液槽内の液面が静止状態となるので、このときに渦流ポンプユニットおよび回収手段を駆動して、液面に浮上した塗料粉を、渦流ポンプユニットから吐出された液流れにより一箇所に集めて、回収手段により効率良く回収できる。
【0011】
請求項4に記載された発明は、請求項1乃至3のいずれか記載の液処理装置における回収手段が、液面に浮上した沈澱性粒子を含む泡状スカムを吸引する真空ポンプと、この真空ポンプへの吸引管路中に設けられ泡状スカムを収容するとともに真空圧により泡を破壊して気液を分離するスカム回収タンクと、液中の沈澱性粒子を分離除去するフィルタとを具備したものであり、液面に浮上した沈澱性粒子を含む泡状スカムを真空ポンプにより吸引してスカム回収タンクに回収し、スカム回収タンク内の真空圧で泡状スカムの泡を破壊して気液を分離し、液中の沈澱性粒子をフィルタで分離除去するので、泡状スカム内の沈澱性粒子を効率良く分離して少量にした上で廃棄処理できる。
【0012】
【発明の実施の形態】
以下、本発明を図1および図2に示された一実施の形態、図3に示された渦流ポンプユニットの変形例を参照しながら詳細に説明する。
【0013】
図1には、図4に示された塗装用ベンチュリブース13が別の断面で示されているので、同一部分には同一符号を付する。
【0014】
この塗装用ベンチュリブース13は、塗料ミストを排気ファン24により吸引する過程で、ブース本体14の下部に設けられた液槽15内の液面19にて塗料ミストを捕集するものであり、この塗装用ベンチュリブース13に液浄化処理用の液処理装置が設置されている。
【0015】
この液処理装置は、沈澱性粒子としての塗料粉を含む液が収容された液槽15と、この液槽15内の液を循環させるとともに液中に微細な気泡を発生させる渦流ポンプユニット31を具備している。
【0016】
渦流ポンプユニット31は、液槽15の下部から引出された管路32が、渦流ポンプ33の液吸込口34に接続され、渦流ポンプ33の吐出口35が、管路36を経て液槽15の上部に接続され、さらに、渦流ポンプ33内の液吸込部に空気吸込管37が挿入されている。液吸込側の管路32には、吸込流量調整弁38および圧力計39がそれぞれ設けられている。
【0017】
図2は、渦流ポンプ33の一例を示し、この渦流ポンプ33は、ポンプ本体41内に羽根車42が回転可能に嵌合されており、この羽根車42の外周部には、複数の小羽根43およびこれらの小羽根43の間の羽根溝44が設けられており、羽根車42の中心に嵌着された回転軸45を外部のモータなどで回動することにより、羽根車42とともにこれらの小羽根43および羽根溝44が回転する。
【0018】
ポンプ本体41と羽根車42との間には環状の昇圧通路46が形成され、この昇圧通路46の入口に位置する液吸込部47に、外部の管路32と接続される液吸込口34が連通され、また、昇圧通路46の出口に位置する吐出部48に、外部の管路36と接続される吐出口35が連通形成され、液吸込部47と吐出部48との間に隔離部49が形成されている。
【0019】
渦流ポンプ33の液吸込口34を形成する部分には、空気吸込管37が螺入されて固定されており、この空気吸込管37の先端部分は液吸込部47まで挿入され、空気吸込管37の内部に形成された吸気孔37aが液吸込部47に開口されている。
【0020】
そして、渦流ポンプ33の羽根車42を回転させると、液吸込口34から液吸込部47に吸込まれた液は、羽根車42と共に昇圧通路46をほぼ一周し、その間に昇圧されて吐出部48より吐出口35を経て外部へ吐出される。
【0021】
その際、昇圧通路46に吸込まれた液には、羽根車42の各羽根溝44内と昇圧通路46との間で渦流が生じ、この渦流の発生が各羽根溝44で同時に行なわれながら昇圧通路46内を進み、昇圧通路46を進むにつれて昇圧される。
【0022】
また、液吸込部47から昇圧通路46内に液が吸込まれる際に、空気吸込管37の吸気孔37aから液吸込部47に空気も吸込まれ、液と空気とが一緒に羽根車42と昇圧通路46との間で生じる渦流によって攪拌され、微細な気泡が作られる。
【0023】
このとき、液吸込部47では昇圧通路46に吸込まれる液の流速が速く圧力が低くなるため、この液吸込部47に挿入された空気吸込管37の吸気孔37aから液中への空気の吸込効率がよい。
【0024】
このように、渦流ポンプ33内で液中に空気が混合され昇圧された気液混合体は、吐出口35から管路36を経て、塗装用ベンチュリブース13の液槽15に吐出される。
【0025】
この気液混合体は、無数の微細な気泡を含み、その微細な気泡が、塗装用ベンチュリブース13の液面19で捕集されて沈降しようとする塗料粉に結合して、この塗料粉を浮上させ、液面19に塗料粉を含む泡状スカム50を形成させる。
【0026】
一方、この塗装用ベンチュリブース13の液槽15において渦流ポンプユニット31とは反対側に、泡状スカム50の形態で液面19に浮上した塗料粉を回収する回収手段51が設けられている。
【0027】
この回収手段51は、液面19に浮上した塗料粉を含む泡状スカム50を吸引管路52を経て吸引する真空ポンプ53が設置され、この真空ポンプ53への吸引管路52中に、泡状スカム50を収容するとともに真空圧により泡状スカム50の泡を破壊して気液を分離するスカム回収タンク54が設けられ、このスカム回収タンク54の下部に、弁55を介して、液中の塗料粉を粉末状態の廃棄物として分離除去するフィルタ56が設けられている。
【0028】
スカム回収タンク54の上部には真空度計57が設けられ、また、フィルタ56の下部には、フィルタ56内の濾紙により濾過された液を液槽15に戻すための戻し管路58が接続されている。
【0029】
なお、渦流ポンプユニット31の渦流ポンプ33および回収手段51の真空ポンプ53は、塗装用ベンチュリブース13の排気ファン24の停止時に稼働されるように、これらの制御回路を設けておく。
【0030】
次に、図1および図2に示された実施の形態の作用を説明する。
【0031】
塗装用ベンチュリブース13の排気ファン24の運転時は、液処理装置を稼働停止させ、一方、排気ファン24の停止時は、液処理装置の渦流ポンプユニット31および回収手段51を稼働させるように自動運転する。
【0032】
液処理装置の稼働時は、渦流ポンプユニット31を駆動して、渦流ポンプ33内の液吸込部47に吸込まれる液中に空気吸込管37より空気を供給して、羽根車42の羽根溝44と昇圧通路46との間で生じる渦流によって気液を攪拌しながら昇圧させることにより、液中に微細な気泡を多量に発生させるとともに液中に酸素を溶存させ、この気液混合体を渦流ポンプ33から吐出して、塗装用ベンチュリブース13の液槽15内の液中に噴出させる。
【0033】
液槽15内の液面で捕集された塗料ミストの塗料粉は、沈澱性粒子であり、そのままでは時間の経過とともに液槽15の底部に沈降するが、渦流ポンプ33から塗装用ベンチュリブース13の液槽15内に液とともに噴込まれた微細な気泡が塗装粉と結合して、塗装粉を液面19に浮上させるので、液面19には塗装粉を含む泡状スカム50が生成される。
【0034】
液面19に浮上した塗料粉の泡状スカム50は、渦流ポンプ33から吐出された液流れに導かれて、回収手段51の側に移動され、一箇所に集められる。
【0035】
液面19の一個所に集められた泡状スカム50は、真空ポンプ53の吸引力により吸引管路52を経て吸引され、スカム回収タンク54内に導入される。
【0036】
スカム回収タンク54内に収容された泡状スカムの泡は、スカム回収タンク54内の真空圧により破壊され、気液が分離される。空気は、真空ポンプ53により外部へ排気され、液は、スカム回収タンク54の下部に溜められる。
【0037】
定期的に弁55を開くことにより、スカム回収タンク54内の液は、フィルタ56内の濾紙で濾過され、戻し管路58にて液槽15に戻される。液中の塗料粉は、フィルタ56の濾紙により粉末状態の廃棄物として分離除去される。濾紙および濾紙内で乾燥された粉末は、そのまま廃棄処分される。
【0038】
次に、図1および図2に示された実施の形態の効果を列挙する。
【0039】
渦流ポンプユニット31から塗装用ベンチュリブース13の液槽15の液中に微細な気泡を多量に供給し、微細な気泡を液中の塗料粉に結合させて、塗料粉を液面19に浮上させ、液面19に生成された塗料粉を含む泡状スカム50を回収手段51により回収するので、液中の塗料粉を塗装用ベンチュリブース13の液槽15内に沈澱堆積させずに回収できる。
【0040】
同時に、微細な気泡の供給により、液中の溶存酸素量が増加するため、悪臭源である嫌気性バクテリアの発生が抑制され、塗装用ベンチュリブース13から液の腐敗によって発生する悪臭を抑えることができるとともに、溶存酸素による液浄化の効果により液寿命が延長するため、産廃処理費などの液処理に要する費用を低減できる。
【0041】
塗装用ベンチュリブース13の排気ファン24の停止時は、液槽15内の液面19が静止状態となるので、このとき、液処理装置の渦流ポンプユニット31および回収手段51を稼働させるように自動運転することで、液面19に浮上した塗料粉を含む泡状スカム50を、渦流ポンプ33から吐出された液流れにより一箇所に集めて、回収手段51により効率良く回収できる。
【0042】
渦流ポンプ33内の液吸込部47に液が吸込まれる際に、空気吸込管37から液吸込部47に空気も吸込まれ、液と空気とが渦流ポンプ33内で生じる渦流によって十分に攪拌されるので、微細な気泡を効率良く製造できるとともに、液中の溶存酸素量を効率良く増加させることができる。
【0043】
液面19に浮上した塗料粉を含む泡状スカム50を真空ポンプ53により吸引してスカム回収タンク54に回収し、スカム回収タンク54内の真空圧で泡状スカム50の泡を破壊して気液を分離し、液中の塗料粉をフィルタ56で分離除去するので、泡状スカム50内の塗料粉を効率良く分離して少量にした上で廃棄処理できる。
【0044】
なお、液面19より泡状スカムを回収するその他の回収手段としては、特殊べルトの表面に付着した泡状スカムをスキマにより掻取るオイルスキマ方式、回転式またはスライド式の掻取機による分離除去方式、回転ドラム形スクリーンの表面に付着した泡状スカムをスキマにより掻取るスクリーンスキマ方式などがあるので、回収手段としては、これらの分離除去方式を用いても良い。
【0045】
また、スカム回収タンク54内の泡状スカムを脱水処理するスカム脱水処理方式としては、上記フィルタ56の濾紙で水分を濾過する方式だけでなく、スカム回収タンク54内を高真空にすることで、泡を壊すとともに真空にて脱水分離する方式もある。
【0046】
いずれにしても、泡状スカム50中の水分が除去され乾燥した粉末となるため、廃棄量が極度に少なくなる。
【0047】
次に、図3は、前記渦流ポンプ33の始動方式を改良した渦流ポンプユニット31を示す。
【0048】
この図3に示された渦流ポンプユニット31は、渦流ポンプ33を液槽15の上側に設置した吸上げ条件の場合であり、このような吸上げ条件では、ポンプ起動と同時に空気吸込管37より空気が吸込まれると、ポンプ吸込側の管路32中の空気が排出されず、いつまでも渦流ポンプ33に液槽15内の液が供給されず空転状態が続き、ドライ運転によりポンプシール部などを損傷する問題がある。
【0049】
このような問題を解決するために、空気吸込管37中に管路開閉用の電磁弁61が設けられ、また、渦流ポンプ33の吐出口35から液槽15内に配管された吐出側の管路36中に液流れ検知手段としてのフロースイッチ62が設けられている。このフロースイッチ62は、渦流ポンプ33の吐出口35から吐出された液流れを検知して電磁弁61を開くものである。吐出側の管路36中には吐出流量調整弁63も設けられている。
【0050】
そして、電磁弁61とフロースイッチ62とを併用し、空気吸込管37からの空気注入(オン,オフ)を自動制御する。
【0051】
すなわち、ポンプ起動時は、電磁弁61を閉じて、空気吸込管37からの空気吸込を阻止することで、渦流ポンプ33は液槽15内の液を管路32を経て効率良く吸込み、短時間のうちに管路32内および渦流ポンプ33内の空気を液と置換するので、ポンプシール部などの損傷を招くドライ運転を防止できる。
【0052】
さらに、渦流ポンプ33内に液がいきわたり、渦流ポンプ33が吸込側の管路32から液を吸引して吐出側の管路36に送給するようになると、フロースイッチ62がその液流れを検知して検知信号を出力し、この検知信号に基づき空気吸込管37中の電磁弁61が開き、空気吸込管37から渦流ポンプ33の液吸込部47に空気が吸引され、液中に適度な空気を混入させる運転へと自動的に切換えることができる。
【0053】
このポンプ始動方式は、渦流ポンプ33を液槽15より上側に設置するなどの、ポンプ設置条件が吸上げ条件の場合でも、渦流ポンプ33による液の吸引と送給を可能にするものである。
【0054】
なお、図1または図3に示された液処理装置は、塗装用ベンチュリブース13の液処理に用いると効果的であるが、塗装用ベンチュリブース13の液槽15だけに用途を限定されるものではなく、その他の、液を循環使用するクーラント液、クーリング液などの沈澱性粒子を含む各種の液の液処理に用いると、その沈澱性粒子を回収することができる。
【0055】
【発明の効果】
請求項記載の発明によれば、渦流ポンプの液吸込部に液が吸込まれる際に、空気吸込管から液吸込部に空気も吸込まれ、液と空気とが渦流ポンプ内で生じる渦流によって十分 に攪拌されるので、微細な気泡を効率良く製造できるとともに、液中の溶存酸素量を効率良く増加させることができる渦流ポンプユニットを用いて、この渦流ポンプユニットから液槽の液中に微細な気泡を多量に供給し、微細な気泡と結合した液中の沈澱性粒子を液面に浮上させ、液面の沈澱性粒子を回収手段により回収するので、液中の沈澱性粒子を液槽内に沈澱堆積させずに回収できる。同時に、微細な気泡の供給により、液中の溶存酸素量が増加するため、悪臭源である嫌気性バクテリアの発生が抑制され、液の腐敗によって発生する悪臭を抑えることができるとともに、溶存酸素による液浄化の効果により液寿命が延長するため、液処理に要する費用を低減できる。また、ポンプ起動時は、電磁弁を閉じて、空気吸込管からの空気吸込を阻止することで、渦流ポンプは液を効率良く吸込んで短時間のうちにポンプ内部の空気を液と置換するので、ポンプシール部などの損傷を招くドライ運転を防止でき、また、渦流ポンプ内に液がいきわたって吐出されたときに、その液流れを検知した液流れ検知手段により電磁弁を開くことで、渦流ポンプの液吸込部に吸込まれる液中に空気吸込管から空気を混入させる運転へと自動的に切換えることができ、渦流ポンプを液槽より上側に設置するなどの、ポンプ設置条件が吸上げ条件の場合にも対応できる。
【0056】
請求項2記載の発明によれば、渦流ポンプユニットから塗装用ベンチュリブースの液中に微細な気泡を多量に供給し、微細な気泡を液中の塗料粉に結合させて塗装粉を液面に浮上させ、液面に浮上した塗料粉を回収手段により回収するので、液中の塗料粉を塗装用ベンチュリブースの液槽内に沈澱堆積させずに回収でき、同時に、空気の注入により、液中の溶存酸素量が増加するため、悪臭源である嫌気性バクテリアの発生が抑制され、塗装用ベンチュリブースから液の腐敗によって発生する悪臭を抑えることができる。
【0057】
請求項3記載の発明によれば、塗装用ベンチュリブースの排気ファン停止時は、液槽内の液面が静止状態となるので、このときに渦流ポンプユニットおよび回収手段を駆動して、液面に浮上した塗料粉を、渦流ポンプユニットから吐出された液流れにより一箇所に集めて、回収手段により効率良く回収できる。
【0058】
求項4記載の発明によれば、液面に浮上した沈澱性粒子を含む泡状スカムを真空ポンプにより吸引してスカム回収タンクに回収し、スカム回収タンク内の真空圧で泡状スカムの泡を破壊して気液を分離し、液中の沈澱性粒子をフィルタで分離除去するので、泡状スカム内の沈澱性粒子を効率良く分離して少量にした上で廃棄処理できる。
【図面の簡単な説明】
【図1】 本発明に係る液処理装置の一実施の形態を示す断面図である。
【図2】 同上液処理装置に用いられた渦流ポンプの断面図である。
【図3】 同上渦流ポンプの始動方式を改良した渦流ポンプユニットの配管図である。
【図4】 塗装用ベンチュリブースの断面図である。
【符号の説明】
13 塗装用ベンチュリブース
15 液槽
19 液面
24 排気ファン
31 渦流ポンプユニット
33 渦流ポンプ
35 吐出口
36 管路
37 空気吸込管
47 液吸込部
50 泡状スカム
51 回収手段
52 吸引管路
53 真空ポンプ
54 スカム回収タンク
56 フィルタ
61 電磁弁
62 液流れ検知手段としてのフロースイッチ
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid processing apparatus for processing a liquid containing precipitated particles.
[0002]
[Prior art]
For example, as shown in FIG. 4, there is a coating venturi booth 13 for preventing the paint mist 12 sprayed from the coating nozzle 11 from spreading around the periphery.
[0003]
This painting venturi booth 13 includes a liquid tank 15 below the booth main body 14, and a partition plate 18 for partitioning the coating space 16 and the recovery space 17 on the liquid tank 15 includes a suction gap 20 for the liquid surface 19. A plurality of baffle plates 21, 22, and 23 are alternately arranged in the collection space 17, and an exhaust fan 24 is provided on the booth main body above the collection space 17.
[0004]
The paint mist 12 sprayed from the coating nozzle 11 is sucked together with air from the painting space 16 through the suction gap 20 into the recovery space 17 by the suction force of the exhaust fan 24, and at that time, the lowermost baffle plate 21 A downward force is applied by the pressure, separated from the air, struck against the liquid surface 19, and collected. On the other hand, the air rises by the suction force of the exhaust fan 24 and is exhausted to the outside.
[0005]
Since the coating powder struck and collected on the liquid surface 19 in this way is a precipitating particle, it settles in the liquid tank 15 with time and accumulates as sludge sludge.
[0006]
[Problems to be solved by the invention]
Since this liquid rots and generates a bad odor, the sludge that has settled is periodically removed.However, it is extremely difficult to scrape the sludge that has settled and accumulated at the bottom of the liquid tank 15 once. There is a problem that takes time and money.
[0007]
The present invention has been made in view of these points, and an object of the present invention is to provide a liquid processing apparatus capable of recovering the precipitated particles in the liquid without being deposited.
[0008]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a liquid tank containing a liquid containing precipitating particles, a vortex pump unit that circulates the liquid in the liquid tank and generates fine bubbles in the liquid, and the bubbles. A collecting means for collecting the sedimentary particles floating on the liquid surface, and the vortex pump unit includes a vortex pump and an air suction pipe inserted into a liquid suction section in the vortex pump, and the vortex pump Has a structure in which fine bubbles are made by stirring the liquid sucked from the liquid suction part and the air sucked into the liquid suction part from the air suction pipe by vortex generated inside, a solenoid valve for the conduit opening provided in the air suction pipe, a liquid processing apparatus comprising a liquid flow sensing means for opening and detects the liquid flow discharged from the discharge port of the vortex flow pump the solenoid valve Yes, such a configuration is adopted By this, when liquid is sucked into the liquid suction part of the vortex pump, air is also sucked into the liquid suction part from the air suction pipe, and the liquid and air are sufficiently stirred by the vortex generated in the vortex pump. Using a vortex pump unit that can efficiently produce fine bubbles and efficiently increase the amount of dissolved oxygen in the liquid, a large amount of fine bubbles can be supplied from the vortex pump unit into the liquid in the liquid tank. In addition, a small amount of bubbles are bound to the settleable particles in the liquid so that the settleable particles are floated on the liquid surface, and the floated settleable particles are collected by the collecting means, so that the settleable particles in the liquid are settled in the liquid tank. It can be recovered without being deposited. At the same time, the supply of fine bubbles increases the amount of dissolved oxygen in the liquid, so the generation of anaerobic bacteria, which is a source of malodor, is suppressed, and the malodor generated by the decay of the liquid can be suppressed. Since the life of the liquid is extended due to the effect of liquid purification, the cost required for liquid treatment can be reduced. Also, when starting the pump, the solenoid valve is closed to prevent air from being sucked in from the air suction pipe, so that the vortex pump efficiently sucks the liquid and replaces the air inside the pump with the liquid in a short time. This can prevent dry operation that causes damage to the pump seals, etc., and when liquid is spilled and discharged into the vortex pump, the solenoid valve is opened by the liquid flow detection means that detects the liquid flow. The pump can be automatically switched to the operation in which air is mixed from the air suction pipe into the liquid sucked into the liquid suction part of the pump, and the pump installation conditions such as installing the vortex pump above the liquid tank It can also handle the case of conditions.
[0009]
According to a second aspect of the present invention, the liquid tank in the liquid processing apparatus according to the first aspect is provided at a lower portion of the coating venturi booth that collects the paint mist at the liquid level in the process of sucking the paint mist by the exhaust fan. A large amount of fine bubbles are supplied from the vortex pump unit into the liquid of the Venturi booth for painting, and the fine bubbles are combined with the paint powder in the liquid to float the paint powder to the liquid surface. Since the powder is recovered by the recovery means, the paint powder in the liquid can be recovered without being deposited in the liquid tank of the coating venturi booth, and at the same time, the amount of dissolved oxygen in the liquid increases due to the injection of air. Generation of anaerobic bacteria, which is a source of malodor, is suppressed, and malodor caused by liquid decay from the coating venturi booth can be suppressed.
[0010]
The invention described in claim 3 is the liquid processing apparatus according to claim 2, wherein the vortex pump unit and the recovery means are operated when the exhaust fan of the painting venturi booth is stopped, and the exhaust fan of the painting venturi booth At the time of stoppage, the liquid level in the liquid tank is in a stationary state. At this time, the vortex pump unit and the recovery means are driven, and the paint powder that has floated on the liquid level is caused by the liquid flow discharged from the vortex pump unit. Collected in one place and can be efficiently recovered by the recovery means.
[0011]
The invention described in claim 4, recovery means in the liquid processing apparatus according to any one of claims 1 to 3, a vacuum pump for sucking the foam scum containing precipitate particles which floated on the liquid surface, the vacuum A scum recovery tank that is provided in a suction pipe to the pump and accommodates foam scum and breaks bubbles by vacuum pressure to separate gas and liquid, and a filter that separates and removes precipitating particles in the liquid. The foamed scum containing precipitated particles floating on the liquid surface is sucked by a vacuum pump and collected in a scum recovery tank, and the bubbles in the scum recovery tank are destroyed by the vacuum pressure in the scum recovery tank. Since the precipitate particles in the liquid are separated and removed by a filter, the precipitate particles in the foam scum can be efficiently separated to a small amount and disposed of.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to one embodiment shown in FIGS. 1 and 2 and a modification of the vortex pump unit shown in FIG.
[0013]
In FIG. 1, the painting venturi booth 13 shown in FIG. 4 is shown in a different cross section, and thus the same reference numerals are given to the same parts.
[0014]
This painting venturi booth 13 collects the paint mist at the liquid level 19 in the liquid tank 15 provided in the lower part of the booth main body 14 in the process of sucking the paint mist by the exhaust fan 24. A liquid treatment apparatus for liquid purification treatment is installed in the painting venturi booth 13.
[0015]
This liquid processing apparatus includes a liquid tank 15 containing a liquid containing paint powder as a precipitating particle, and a vortex pump unit 31 that circulates the liquid in the liquid tank 15 and generates fine bubbles in the liquid. It has.
[0016]
In the vortex pump unit 31, a pipe 32 drawn from the lower part of the liquid tank 15 is connected to a liquid suction port 34 of the vortex pump 33, and a discharge port 35 of the vortex pump 33 is connected to the liquid tank 15 via the pipe 36. Further, an air suction pipe 37 is inserted into the liquid suction part in the vortex pump 33 and connected to the upper part. A suction flow rate adjustment valve 38 and a pressure gauge 39 are provided in the pipe line 32 on the liquid suction side.
[0017]
FIG. 2 shows an example of the vortex pump 33. The vortex pump 33 has an impeller 42 rotatably fitted in a pump body 41, and a plurality of small blades are disposed on the outer periphery of the impeller 42. 43 and a blade groove 44 between these small blades 43 are provided, and the rotating shaft 45 fitted in the center of the impeller 42 is rotated by an external motor etc. The small blade 43 and the blade groove 44 rotate.
[0018]
An annular pressure increasing passage 46 is formed between the pump main body 41 and the impeller 42, and a liquid suction port 34 connected to an external conduit 32 is formed in the liquid suction portion 47 located at the inlet of the pressure increasing passage 46. A discharge port 35 connected to the external pipe line 36 is formed in communication with the discharge unit 48 that is located at the outlet of the pressure increasing passage 46, and an isolation unit 49 is provided between the liquid suction unit 47 and the discharge unit 48. Is formed.
[0019]
An air suction pipe 37 is screwed into and fixed to a part of the vortex pump 33 that forms the liquid suction port 34, and the tip of the air suction pipe 37 is inserted to the liquid suction part 47, and the air suction pipe 37 An intake hole 37 a formed in the inside of the liquid is opened in the liquid suction portion 47.
[0020]
Then, when the impeller 42 of the vortex pump 33 is rotated, the liquid sucked into the liquid suction portion 47 from the liquid suction port 34 almost goes around the boost passage 46 together with the impeller 42, and is boosted during that time to be discharged. Further, it is discharged to the outside through the discharge port 35.
[0021]
At that time, in the liquid sucked into the pressure increase passage 46, a vortex is generated between each pressure groove 46 of the impeller 42 and the pressure increase passage 46, and the generation of this vortex is simultaneously performed in each blade groove 44 while increasing the pressure. The pressure in the passage 46 is increased as the pressure in the pressure increase passage 46 is advanced.
[0022]
Further, when liquid is sucked into the pressure increasing passage 46 from the liquid suction portion 47, air is also sucked into the liquid suction portion 47 from the air suction hole 37a of the air suction pipe 37, and the liquid and air together with the impeller 42 Agitation is generated by the vortex generated between the pressurizing passage 46 and fine bubbles are formed.
[0023]
At this time, in the liquid suction part 47, the flow rate of the liquid sucked into the pressure increasing passage 46 is fast and the pressure is low, so that the air from the intake hole 37a of the air suction pipe 37 inserted in the liquid suction part 47 into the liquid Suction efficiency is good.
[0024]
In this way, the gas-liquid mixture whose pressure is increased by mixing air in the liquid in the vortex pump 33 is discharged from the discharge port 35 to the liquid tank 15 of the coating venturi booth 13 through the pipe 36.
[0025]
This gas-liquid mixture contains innumerable fine bubbles, and these fine bubbles are collected at the liquid level 19 of the coating venturi booth 13 and bonded to the paint powder to be settled. As a result, the liquid surface 19 is formed with a foam scum 50 containing paint powder.
[0026]
On the other hand, in the liquid tank 15 of the painting venturi booth 13, a collecting means 51 is provided on the opposite side of the vortex pump unit 31 to collect paint powder that has floated on the liquid surface 19 in the form of a foam scum 50.
[0027]
The recovery means 51 is provided with a vacuum pump 53 for sucking the foamed scum 50 containing the paint powder floating on the liquid surface 19 through the suction pipe 52, and in the suction pipe 52 to the vacuum pump 53, there is a bubble. A scum recovery tank 54 is provided for storing the scum 50 and breaking the bubbles of the foam scum 50 by vacuum pressure to separate the gas and liquid. A scum recovery tank 54 is provided under the scum recovery tank 54 via a valve 55. A filter 56 is provided to separate and remove the paint powder as waste in a powder state.
[0028]
A vacuum gauge 57 is provided in the upper part of the scum recovery tank 54, and a return pipe 58 for returning the liquid filtered by the filter paper in the filter 56 to the liquid tank 15 is connected to the lower part of the filter 56. ing.
[0029]
Note that the vortex pump 33 of the vortex pump unit 31 and the vacuum pump 53 of the recovery means 51 are provided with these control circuits so as to be operated when the exhaust fan 24 of the painting venturi booth 13 is stopped.
[0030]
Next, the operation of the embodiment shown in FIGS. 1 and 2 will be described.
[0031]
When the exhaust fan 24 of the paint venturi booth 13 is in operation, the liquid processing device is automatically stopped. On the other hand, when the exhaust fan 24 is stopped, the liquid processing device vortex pump unit 31 and the recovery means 51 are automatically operated. drive.
[0032]
During operation of the liquid processing apparatus, the eddy current pump unit 31 is driven to supply air from the air suction pipe 37 into the liquid sucked into the liquid suction part 47 in the vortex pump 33, and the blade groove of the impeller 42 The gas-liquid is agitated by the vortex generated between 44 and the pressure-increasing passage 46, and the pressure is increased while agitating the gas-liquid, so that a large amount of fine bubbles are generated in the liquid and oxygen is dissolved in the liquid. It is discharged from the pump 33 and ejected into the liquid in the liquid tank 15 of the coating venturi booth 13.
[0033]
The paint powder of the paint mist collected at the liquid level in the liquid tank 15 is a sedimentary particle, and as it is, it settles to the bottom of the liquid tank 15 over time, but from the vortex pump 33, the paint venturi booth 13 Fine bubbles injected into the liquid tank 15 together with the liquid combine with the coating powder, and the coating powder floats on the liquid level 19, so that a foamy scum 50 containing the coating powder is generated on the liquid level 19. The
[0034]
The foam scum 50 of the paint powder that has floated on the liquid surface 19 is guided by the liquid flow discharged from the vortex pump 33, moved to the collecting means 51 side, and collected in one place.
[0035]
The foamed scum 50 collected at one location on the liquid surface 19 is sucked through the suction pipe 52 by the suction force of the vacuum pump 53 and introduced into the scum recovery tank 54.
[0036]
The foam scum foam accommodated in the scum recovery tank 54 is broken by the vacuum pressure in the scum recovery tank 54, and the gas and liquid are separated. The air is exhausted to the outside by the vacuum pump 53, and the liquid is stored in the lower part of the scum recovery tank.
[0037]
By periodically opening the valve 55, the liquid in the scum recovery tank 54 is filtered by the filter paper in the filter 56 and returned to the liquid tank 15 through the return line 58. The paint powder in the liquid is separated and removed as powdered waste by the filter paper of the filter 56. The filter paper and the powder dried in the filter paper are discarded as they are.
[0038]
Next, effects of the embodiment shown in FIGS. 1 and 2 are listed.
[0039]
A large amount of fine bubbles are supplied from the eddy current pump unit 31 into the liquid in the liquid tank 15 of the coating venturi booth 13, and the fine bubbles are combined with the paint powder in the liquid to float the paint powder to the liquid level 19. Since the foam scum 50 containing the paint powder generated on the liquid surface 19 is collected by the collecting means 51, the paint powder in the liquid can be collected without being deposited in the liquid tank 15 of the coating venturi booth 13.
[0040]
At the same time, since the amount of dissolved oxygen in the liquid increases due to the supply of fine bubbles, the generation of anaerobic bacteria, which is a source of malodor, is suppressed, and the malodor caused by the decay of the liquid from the coating venturi booth 13 can be suppressed. In addition, since the life of the liquid is extended due to the effect of liquid purification by dissolved oxygen, the cost required for liquid processing such as industrial waste processing costs can be reduced.
[0041]
When the exhaust fan 24 of the painting venturi booth 13 is stopped, the liquid level 19 in the liquid tank 15 is in a stationary state. At this time, the vortex pump unit 31 and the recovery means 51 of the liquid processing apparatus are automatically operated. By operating, the foam scum 50 containing the paint powder floating on the liquid level 19 is collected in one place by the liquid flow discharged from the vortex pump 33, and can be efficiently recovered by the recovery means 51.
[0042]
When liquid is sucked into the liquid suction part 47 in the vortex pump 33, air is also sucked into the liquid suction part 47 from the air suction pipe 37, and the liquid and air are sufficiently stirred by the vortex generated in the vortex pump 33. Therefore, it is possible to efficiently produce fine bubbles and to efficiently increase the amount of dissolved oxygen in the liquid.
[0043]
Foam scum 50 containing paint powder that has floated on the liquid surface 19 is sucked by the vacuum pump 53 and collected in the scum recovery tank 54, and the bubbles in the foam scum 50 are destroyed by the vacuum pressure in the scum recovery tank 54. Since the liquid is separated and the paint powder in the liquid is separated and removed by the filter 56, the paint powder in the foam scum 50 can be efficiently separated to a small amount and disposed of.
[0044]
Other recovery means for recovering the foam scum from the liquid level 19 is an oil skimmer method in which the foam scum adhering to the surface of the special belt is scraped off by a skimmer, and separation by a rotary or slide type scraper. Since there are a removal method, a screen skimmer method in which foam scum adhering to the surface of the rotating drum screen is scraped off, etc., these separation and removal methods may be used as the collecting means.
[0045]
Further, as a scum dewatering treatment method for dewatering the foam scum in the scum recovery tank 54, not only a method of filtering moisture with the filter paper of the filter 56, but also by making the inside of the scum recovery tank 54 high vacuum, There is also a method of dehydrating and separating in a vacuum while breaking bubbles.
[0046]
In any case, since the water in the foam scum 50 is removed and the powder is dried, the amount of waste is extremely reduced.
[0047]
Next, FIG. 3 shows a vortex pump unit 31 in which the starting method of the vortex pump 33 is improved.
[0048]
The eddy current pump unit 31 shown in FIG. 3 is in the case of a suction condition in which the vortex pump 33 is installed on the upper side of the liquid tank 15, and in such a suction condition, the air suction pipe 37 simultaneously starts the pump. If air is sucked in, the air in the pipe 32 on the pump suction side will not be discharged, the liquid in the liquid tank 15 will not be supplied to the vortex pump 33 indefinitely, and the idling state will continue. There is a problem to damage.
[0049]
In order to solve such a problem, a solenoid valve 61 for opening and closing a pipe line is provided in the air suction pipe 37, and a discharge side pipe piped from the discharge port 35 of the vortex pump 33 into the liquid tank 15 is provided. A flow switch 62 is provided in the path 36 as a liquid flow detection means. The flow switch 62 detects the liquid flow discharged from the discharge port 35 of the vortex pump 33 and opens the electromagnetic valve 61. A discharge flow rate adjusting valve 63 is also provided in the discharge side pipe line 36.
[0050]
Then, the solenoid valve 61 and the flow switch 62 are used in combination to automatically control the air injection (ON / OFF) from the air suction pipe 37.
[0051]
That is, when starting the pump, by closing the solenoid valve 61 and preventing air suction from the air suction pipe 37, the vortex pump 33 efficiently sucks the liquid in the liquid tank 15 through the pipe line 32, Among them, the air in the pipe line 32 and the vortex pump 33 is replaced with liquid, so that it is possible to prevent a dry operation that causes damage to the pump seal portion and the like.
[0052]
Furthermore, when liquid flows into the vortex pump 33 or the vortex pump 33 draws liquid from the suction side pipe 32 and feeds it to the discharge side pipe 36, the flow switch 62 detects the liquid flow. Based on this detection signal, the solenoid valve 61 in the air suction pipe 37 is opened, air is sucked from the air suction pipe 37 into the liquid suction portion 47 of the vortex pump 33, and moderate air is submerged in the liquid. It is possible to automatically switch to the operation that mixes.
[0053]
This pump starting system enables the liquid to be sucked and fed by the vortex pump 33 even when the pump installation condition is the suction condition, such as installing the vortex pump 33 above the liquid tank 15.
[0054]
The liquid treatment apparatus shown in FIG. 1 or FIG. 3 is effective when used for the liquid treatment of the coating venturi booth 13, but its application is limited to the liquid tank 15 of the coating venturi booth 13. Instead, the precipitate particles can be recovered when used for the liquid treatment of other liquids including the precipitate particles such as coolant liquid and cooling liquid that circulate and use the liquid.
[0055]
【The invention's effect】
According to the first aspect of the present invention, when liquid is sucked into the liquid suction portion of the vortex pump, air is also sucked into the liquid suction portion from the air suction pipe, and the liquid and air are generated by the vortex generated in the vortex pump. Since it is sufficiently agitated, it is possible to efficiently produce fine bubbles and to increase the amount of dissolved oxygen in the liquid efficiently, and from this vortex pump unit into the liquid in the liquid tank. A large amount of air bubbles are supplied, the precipitating particles in the liquid combined with the fine air bubbles are floated on the liquid surface, and the precipitating particles on the liquid surface are recovered by the recovery means. It can be recovered without sedimentation. At the same time, the supply of fine bubbles increases the amount of dissolved oxygen in the liquid, so the generation of anaerobic bacteria, which is a source of malodor, is suppressed, and the malodor generated by the decay of the liquid can be suppressed. Since the life of the liquid is extended due to the effect of liquid purification, the cost required for liquid treatment can be reduced. Also, when starting the pump, the solenoid valve is closed to prevent air from being sucked in from the air suction pipe, so that the vortex pump efficiently sucks the liquid and replaces the air inside the pump with the liquid in a short time. This can prevent dry operation that causes damage to the pump seals, etc., and when liquid is spilled and discharged into the vortex pump, the solenoid valve is opened by the liquid flow detection means that detects the liquid flow. The pump can be automatically switched to the operation in which air is mixed from the air suction pipe into the liquid sucked into the liquid suction part of the pump, and the pump installation conditions such as installing the vortex pump above the liquid tank It can also handle the case of conditions.
[0056]
According to the second aspect of the present invention, a large amount of fine bubbles are supplied from the vortex pump unit into the liquid in the coating venturi booth, and the fine bubbles are combined with the paint powder in the liquid so that the coating powder is brought to the liquid level. The paint powder that has been levitated and floated on the liquid surface is collected by the recovery means, so the paint powder in the liquid can be collected without being deposited in the liquid tank of the coating venturi booth, and at the same time, by injecting air, Since the amount of dissolved oxygen increases, the generation of anaerobic bacteria, which is a source of malodor, is suppressed, and malodor caused by liquid decay from the coating venturi booth can be suppressed.
[0057]
According to the third aspect of the present invention, when the exhaust fan of the coating venturi booth is stopped, the liquid level in the liquid tank is in a stationary state. At this time, the vortex pump unit and the recovery means are driven to The paint powder that has floated to the surface is collected in one place by the liquid flow discharged from the vortex pump unit, and can be efficiently recovered by the recovery means.
[0058]
According to the invention of Motomeko 4, the foam scum containing precipitate particles which floated on the liquid surface were collected scum collecting tank by suction by a vacuum pump, foam scum in a vacuum pressure in the scum collecting tank The bubbles are broken to separate the gas and liquid, and the precipitated particles in the liquid are separated and removed by a filter, so that the precipitated particles in the foamed scum can be efficiently separated to a small amount and disposed of.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a liquid processing apparatus according to the present invention.
FIG. 2 is a cross-sectional view of a vortex pump used in the liquid processing apparatus.
FIG. 3 is a piping diagram of an eddy current pump unit in which the starting method of the eddy current pump is improved.
FIG. 4 is a cross-sectional view of a paint venturi booth.
[Explanation of symbols]
13 Venturi booth for painting
15 liquid tank
19 Liquid level
24 Exhaust fan
31 Eddy current pump unit
33 Eddy current pump
35 Discharge port
36 pipelines
37 Air suction pipe
47 Liquid suction part
50 Foam scum
51 Collection means
52 Suction line
53 Vacuum pump
54 Scum recovery tank
56 Filter
61 Solenoid valve
62 Flow switch as a means of detecting liquid flow

Claims (4)

沈澱性粒子を含む液が収容された液槽と、
この液槽内の液を循環させるとともに液中に微細な気泡を発生させる渦流ポンプユニットと、
気泡により液面に浮上した沈澱性粒子を回収する回収手段とを具備し、
前記渦流ポンプユニットは、
渦流ポンプと、
この渦流ポンプ内の液吸込部に挿入された空気吸込管とを備え、
前記渦流ポンプは、
前記液吸込部から吸込まれた液と前記空気吸込管から前記液吸込部に吸込まれた空気とが内部で生じる渦流によって攪拌されることで微細な気泡が作られる構造を有し、
前記空気吸込管中に設けられた管路開閉用の電磁弁と、
前記渦流ポンプの吐出口から吐出された液流れを検知して前記電磁弁を開く液流れ検知手段とを具備した
ことを特徴とする液処理装置。
A liquid tank containing a liquid containing precipitating particles;
A vortex pump unit that circulates the liquid in the liquid tank and generates fine bubbles in the liquid;
A recovery means for recovering precipitated particles floating on the liquid surface by bubbles,
The vortex pump unit is
A vortex pump,
An air suction pipe inserted into the liquid suction part in the vortex pump,
The vortex pump is
It has a structure in which fine bubbles are made by stirring the liquid sucked from the liquid suction part and the air sucked into the liquid suction part from the air suction pipe by the vortex generated inside,
A conduit for opening and closing an electromagnetic valve provided in the air suction pipe,
Liquid processing apparatus you characterized in that by detecting the liquid flow discharged from the discharge port of the vortex pump; and a liquid flow sensing means for opening the solenoid valve.
液槽は、
塗料ミストを排気ファンにより吸引する過程で液面にて捕集する塗装用ベンチュリブースの下部に設けられた
ことを特徴とする請求項1記載の液処理装置。
The liquid tank
The liquid processing apparatus according to claim 1, wherein the liquid processing apparatus is provided at a lower portion of a coating venturi booth that collects paint mist at a liquid level in a process of sucking the paint mist by an exhaust fan.
渦流ポンプユニットおよび回収手段は、
塗装用ベンチュリブースの排気ファン停止時に稼働させる
ことを特徴とする請求項2記載の液処理装置。
The vortex pump unit and the recovery means are
The liquid processing apparatus according to claim 2, wherein the liquid processing apparatus is operated when the exhaust fan of the paint venturi booth is stopped.
回収手段は、
液面に浮上した沈澱性粒子を含む泡状スカムを吸引する真空ポンプと、
この真空ポンプへの吸引管路中に設けられ泡状スカムを収容するとともに真空圧により泡を破壊して気液を分離するスカム回収タンクと、
液中の沈澱性粒子を分離除去するフィルタと
を具備したことを特徴とする請求項1乃至3のいずれか記載の液処理装置。
The recovery means is
A vacuum pump for sucking foam scum containing precipitated particles floating on the liquid surface;
A scum collecting tank for separating gas and liquid by breaking the foam by the vacuum pressure accommodates the foam scum provided in the suction pipe path to the vacuum pump,
The liquid processing apparatus according to claim 1, further comprising: a filter that separates and removes the precipitating particles in the liquid.
JP2001352212A 2001-11-16 2001-11-16 Liquid processing equipment Expired - Lifetime JP3919508B2 (en)

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Publication number Priority date Publication date Assignee Title
JP2005329397A (en) * 2004-04-23 2005-12-02 Mitsubishi Rayon Co Ltd Method and apparatus for separation
JP6042268B2 (en) * 2013-05-20 2016-12-14 株式会社ニクニ Liquid processing equipment
US20150076079A1 (en) * 2013-09-18 2015-03-19 Alstom Technology Ltd Method and system for seawter foam control
DE102017121777A1 (en) * 2017-09-20 2019-03-21 Lutz Pumpen Gmbh Modified side channel pump and method for operating such
CN111207065A (en) * 2018-11-22 2020-05-29 余姚市雷阵雨电器有限公司 Water pump running time control system
KR101958879B1 (en) * 2018-12-04 2019-07-04 한국종합철관 (주) coating machine for steel pipe and powder coating
CN112145426B (en) * 2020-09-21 2022-02-01 淄博双环真空泵厂 Vacuum water ring combination pump

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