JP3761483B2 - Liquid mixing device - Google Patents

Liquid mixing device Download PDF

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JP3761483B2
JP3761483B2 JP2002087316A JP2002087316A JP3761483B2 JP 3761483 B2 JP3761483 B2 JP 3761483B2 JP 2002087316 A JP2002087316 A JP 2002087316A JP 2002087316 A JP2002087316 A JP 2002087316A JP 3761483 B2 JP3761483 B2 JP 3761483B2
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liquid
tank
liquid level
relay
relay tank
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JP2003275567A (en
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典弘 藤田
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Nakakin Co Ltd
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Nakakin Co Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は、夫々種類の異なった液体を貯めた複数の貯液タンクと、混合機と、各貯液タンクの液体を混合機に各別に送給するロータリーポンプとを備えてなる液体混合装置に関する。
【０００２】
【従来の技術】
果汁飲料、乳酸飲料、その他の飲料用液体の製造において、その飲料用液体の原液とこれを希釈する水とを所定濃度に調整混合するための液体混合装置では、原液タンクの原液及び水タンクの水を夫々ロータリーポンプにより直接吸引して混合機へ送給するようになっている。この場合、ポンプとしてロータリーポンプが使用されるのは、ロータリーポンプが、ベーンポンプ、プランジャーポンプ、歯車ポンプなどのように金属どうし接触することがなく（金属どうしが接触すると、その接触によって生じた金属粉が異物として液体に混入することになる）、しかも構造がシンプルで洗浄が簡単容易に行えて衛生的である上に、他のポンプよりも洩れ率が低いことによるものである。
【０００３】
【発明が解決しようとする課題】
従来の液体混合装置では、上記のように各貯液タンクの液体を夫々ロータリーポンプにより直接吸引して混合機へ送給するようになっているが、このロータリーポンプでも液洩れを生ずることから、その液洩れによって混合機への液体の送給流量が変動し、これにより液体の混合割合が変動して、混合精度が低下する、と云った問題がある。そこで、本発明は、ロータリーポンプによって混合機に送給される液体の送給流量を常に一定に維持できるようにして、混合精度を高めることができる液体混合装置を提供することを目的とする。
【０００４】
【課題を解決するための手段】
請求項１に係る発明は、複数の貯液タンク１，２と、混合機３と、各貯液タンク１，２の液体を混合機３に各別に送給するロータリーポンプ４，５とを備えてなる液体混合装置において、各貯液タンク１，２とこのタンク１，２の液体を混合機３に送給するロータリーポンプ４，５との間に中継タンク６，７を設けると共に、貯液タンク１，２から中継タンク６，７に供給される液体の液位が常に略一定になるように制御する制御手段８，９を設け、制御手段８，９は、中継タンク６，７の液位を検出する液位センサー１８，１９と、このセンサー１８，１９により検出される信号に基づいて、貯液タンク１，２と中継タンク６，７とをつなぐ管路１２，１３に設けた開閉弁１５，１７をモーター１４，１６を介して適宜開閉させることにより、中継タンク６，７の液位が常に略一定になるように制御する制御部２０，２１とからなることを特徴とする。
【０００５】
請求項２に係る発明は、複数の貯液タンク１，２と、混合機３と、各貯液タンク１，２の液体を混合機３に各別に送給するロータリーポンプ４，５とを備えてなる液体混合装置において、各貯液タンク１，２とこのタンク１，２の液体を混合機３に送給するロータリーポンプ４，５との間に中継タンク６，７を設けると共に、貯液タンク１，２から中継タンク６，７に供給される液体の液位が常に略一定になるように制御する制御手段８，９を設け、制御手段８，９は、中継タンク６，７の液位を検出する液位センサー１８，１９と、このセンサーにより検出される信号に基づいて、貯液タンク１，２と中継タンク６，７とをつなぐ管路６，７に設けた液体供給ポンプ２２，２３の停止と起動を適宜繰り返させることにより、中継タンク６，７の液位が常に略一定になるように制御する制御部２０，２１とからなることを特徴とする。
【０００７】
【発明の実施の形態】
図１は本発明に係る液体混合装置の全体を示すブロック線図である。この図１において、１及び２は互いに異なる液体を貯める貯液タンク、３は例えばラインミキサーからなる混合機である。４及び５は貯液タンク１，２からの液体を夫々混合機３に送給するロータリーポンプである。６は貯液タンク１とロータリーポンプ４との間に設けられた中継タンク、７は貯液タンク２とロータリーポンプ５との間に設けた中継タンクである。
【０００８】
また図１において、８は貯液タンク１から中継タンク６に供給される液体Ｌ１の液位が常に略一定になるように制御する制御手段であり、９は貯液タンク２から中継タンク７に供給される液体Ｌ２の液位が常に略一定になるように制御する制御手段である。１０及び１１はロータリーポンプ４，５と混合機３との間に夫々設けた逆止弁で、常時はバネで閉じており、ロータリーポンプ４，５の吐出側が一定圧力以上になると、押し開かれて開弁するようになっている。
【０００９】
貯液タンク１は、中継タンク６より十分高い位置に設置されていて、この貯液タンク１の液体Ｌ１は、その重力により管路１２を流下して中継タンク６に供給されるようになっている。管路１２の途中にはモーター１４によって開閉駆動される開閉弁１５が設けられている。また、貯液タンク２も中継タンク７より十分高い位置に設置されていて、この貯液タンク２の液体Ｌ２も、その重力により管路１３を流下して中継タンク７に供給されるようになっており、また管路１３の途中にはモーター１６によって開閉駆動される開閉弁１７が設けられている。図１において、２６，２７は貯液タンク１，２と混合機３とを夫々つなぐ管路である。
【００１０】
中継タンク６側の制御手段８は、中継タンク６の液位を検出する液位センサー１８と、この液位センサー１８により検出される検出信号に基づいて、貯液タンク１と中継タンク６とをつなぐ管路１２に設けた開閉弁１５を適宜に開閉させることにより、中継タンク６の液位が常に略一定の液位になるように制御する制御部２０と、からなる。また、中継タンク７側の制御手段９は、中継タンク７の液位を検出する液位センサー１９と、この液位センサー１９により検出される検出信号に基づいて、貯液タンク２と中継タンク７とをつなぐ管路１３に設けた開閉弁１７を適宜に開閉させることにより、中継タンク７の液位が常に略一定の液位になるように制御する制御部２１と、からなる。
【００１１】
液位センサー１８，１９としては、静電容量式、電極式液、液圧式などの各種の液位センサーを使用できるが、ここでは静電容量式液位センサーを使用する。中継タンク６側の液位センサー１８は、２本の電極１８ａ，１８ｂを夫々液中に差し込んで、夫々液体に触れる部分と触れない部分との静電容量によって液位を検出するようになっている。液体混合装置の使用中に、一方の電極１８ａが中継タンク６の上限液位Ｈ1Hを検知すると、その検知信号により、制御部２０は開閉弁１５を閉じるようにモーター１４を制御する。これによって、中継タンク６の液位は下がってゆき、そして他方の電極１８ｂが中継タンク６の下限液位Ｈ1Lを検知することにより、制御部２０は開閉弁１５を開放するように制御し、これによって中継タンク６の液位が上がる。以降、同様な動作の繰り返しによって、中継タンク６の液位が常に略一定に維持されることになる。
【００１２】
中継タンク７側の静電容量式液位センサー１９も、上記液位センサー１８と全く同じで、一方の電極１９ａが中継タンク７の上限液位Ｈ2Hを検知し、他方の電極１９ｂが下限液位Ｈ2Lを検知する。この液位センサー１９によって中継タンク７の上限液位Ｈ2Hが検知されると、制御部２１は開閉弁１７を閉じるようにモーター１６を制御し、これによって中継タンク７の液位は下がり、そして他方の電極１９ｂが中継タンク７の下限液位Ｈ2Lを検知することにより、制御部２１が開閉弁１７を開放するように制御し、これによって中継タンク７の液位が上がり、以降は上記動作の繰り返しによって、中継タンク７の液位が常に略一定に維持される。
【００１３】
上記のような構成の液体混合装置を使用して貯液タンク１の液体Ｌ１と貯液タンク２の液体Ｌ２とを所定の比率で混合して連続的に混合液を製造する場合に、ロータリーポンプ４，５を夫々所定回転数で作動させて、貯液タンク１からの液体Ｌ１及び貯液タンク２からの液体Ｌ２を夫々混合機３に送給すると、貯液タンク１の液体Ｌ１が中継タンク６に供給されると共に、制御手段８によって中継タンク６の液位が常に上限液位Ｈ1Hと下限液位Ｈ1Lとの間で常に略一定液位に保たれ、また貯液タンク２の液体Ｌ２も、中継タンク７に供給されると共に、制御手段９によって中継タンク７の液位が常に上限液位Ｈ2Hと下限液位Ｈ2Lとの間で常に略一定液位に保たれる。
【００１４】
こうして中継タンク６，７の液位が常に略一定液位に保たれるから、ロータリーポンプ４には中継タンク６の液体Ｌ１が常に略一定の圧力で送られ、このロータリーポンプ４から吐出される液体Ｌ１の吐出流量は常に略一定となり、従って混合機３に送給される液体Ｌ１の送給流量も常に略一定になる。同様に、ロータリーポンプ５には中継タンク７の液体Ｌ２が常に略一定圧力で送られ、このロータリーポンプ５から吐出される液体Ｌ２の吐出流量は常に略一定となり、従って混合機３に送給される液体Ｌ１の送給流量も常に略一定になる。
【００１５】
上記のようにロータリーポンプ４，５に中継タンク６，７の液体Ｌ１，Ｌ２が夫々常に略一定圧力で送られるから、このロータリーポンプ４，５から吐出される液体Ｌ１，Ｌ２の吐出流量は常に略一定となって、混合機３には液体Ｌ１，Ｌ２が夫々常に略一定の流量で送給され、混合機３での液体の混合割合が変動せず、従って混合精度の高い所定濃度の混合液体を連続的に製造することができる。
【００１６】
上述した実施形態では、貯液タンク１，２が中継タンク６，７より十分高い位置に設置されて、貯液タンク１，２の液体Ｌ１，Ｌ２が管路１２，１３によって中継タンク６，７に重力流下式に供給される場合であるが、貯液タンク１，２が中継タンク６，７と同レベルあるいはそれよりも低い位置に設置される場合は、図１に仮想線で示すように、貯液タンク１，２と中継タンク６，７とをつなぐ管路１２，１３の途中に開閉弁１５，１７に代えて液体送給ポンプ２２，２３を設け、このポンプ２２，２３によって貯液タンク１，２の液体Ｌ１，Ｌ２を夫々中継タンク６，７に供給することができる。
【００１７】
このように貯液タンク１，２と中継タンク６，７とをつなぐ管路１２，１３に液体送給ポンプ２２，２３を設ける場合の制御手段８，９は、図１に示すように中継タンク６，７の液位を検出する液位センサー１８（電極１８ａ，１８ｂ）、１９（電極１９ａ，１９ｂ）と、このセンサー１８，１９により検出される検出信号に基づいて、前記液体供給ポンプ２２，２３の停止と起動とを適宜繰り返し行わせることにより、中継タンク６，７の液位が常に略一定になるように制御する制御部２０，２１とから構成される。
【００１８】
この場合、貯液タンク１の液体Ｌ１が中継タンク６に供給されて、中継タンク６の液位が上限液位Ｈ1Hになると、これを一方の電極１８ａが検知して、その信号により制御部２１がモーター２４を止めて液体供給ポンプ２２を停止させるように制御し、これによって中継タンク６の液位は下がってゆき、そして他方の電極１８ｂが中継タンク６の下限液位Ｈ1Lを検知すると、モーター２３が作動して液体供給ポンプ２２を起動させ、これにより中継タンク６の液位が上がる。以降は上記動作の繰り返しによって、中継タンク６の液位が常に略一定に維持されることになる。
【００１９】
また、貯液タンク２から中継タンク７への液体Ｌ２の供給によって、中継タンク７の液位が上限液位Ｈ2Hになれば、これを一方の電極１９ａが検知して、制御部２１がモーター２５を止めて液体供給ポンプ２３を停止させるように制御し、これによって中継タンク７の液位は下がり、そして他方の電極１９ｂが中継タンク７の下限液位Ｈ2Lを検知すると、モーター２５が作動して液体供給ポンプ２３を起動させるから、中継タンク７の液位が上がり、以降は上記動作の繰り返しによって、中継タンク７の液位が常に略一定に維持される。
【００２０】
以上の実施形態は、夫々２つの貯液タンク１，２と中継タンク６，７とロータリーポンプ４，５とによって２種類の液体を混合機３に送給して混合する場合について説明したが、本発明に係る液体混合装置は、２種類の液体を混合するものに限らず、３種類以上の液体を混合する場合も含み、その場合は、夫々３つ以上の貯液タンクと中継タンクとロータリーポンプとを備えるものとし、作用効果については、上述した実施形態と同様である。また、実施形態では、開閉弁１５，１７の開閉駆動をモーター１４，１６によって行わせているが、この開閉弁１５，１７の開閉駆動は油圧シリンダで行わせるようにしてもよい。
【００２１】
【発明の効果】
請求項１に係る発明によれば、複数の貯液タンクと、混合機と、各貯液タンクの液体を混合機に送給するロータリーポンプとを備えた液体混合装置において、各貯液タンクとロータリーポンプとの間に中継タンクを設け、貯液タンクから中継タンクに供給される液体の液位が常に略一定になるように制御する制御手段を設けたことにより、各貯液タンクの液体は、中継タンクに供給されて、ここで略一定の液位に保たれ、それによってロータリーポンプに送られる液圧が略一定となるから、ロータリーポンプの吐出流量が略一定となって、各貯液タンクから混合機へ送給される液体の送給流量はほとんと変動することがない。従って、複数種類の液体を所定の混合割合で正確に混合させることができ、混合精度を高めることができる。
【００２２】
この発明は、各貯液タンクを中継タンクより高い位置に設置する場合に有効で、各貯液タンクの液体を重力流下式に中継タンクに供給することができ、この場合は貯液タンクと中継タンクをつなぐ管路に例えばモーター駆動式の開閉弁を設ければよい。この場合の制御手段は、中継タンクの液位を検出する液位センサーと、この液位センサーにより検出される検出信号に基づいて、このセンサーにより検出される信号に基づいて、貯液タンクと中継タンクとをつなぐ管路に設けた開閉弁を適宜開閉させることにより、中継タンクの液位が常に略一定になるように制御する制御部とからなる。
【００２３】
請求項２に係る発明は、貯液タンクを中継タンクと同レベルあるいはそれより低い位置に設置する場合に有効で、貯液タンクと中継タンクをつなぐ管路に、請求項１に係る発明の前記開閉弁に代えて液体送給ポンプを設け、このポンプによって貯液タンクの液体を中継タンクに供給するようになっている。この場合の制御手段は、中継タンクの液位を検出する液位センサーと、このセンサーにより検出される信号に基づいて、貯液タンクと中継タンクとをつなぐ管路に設けた液体供給ポンプの停止と起動を適宜繰り返させることにより、中継タンクの液位が常に略一定になるように制御する制御部とからなる。
【図面の簡単な説明】
【図１】 本発明に係る液体混合装置の全体を示すブロック線図である。
【符号の説明】
１，２ 貯液タンク
３ 混合機
４，５ ロータリーポンプ
６，７ 中継タンク
８，９ 制御手段
１５，１６ 開閉弁
１８，１９ 液位センサー
２０，２１ 制御部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid mixing apparatus comprising a plurality of liquid storage tanks each storing different types of liquids, a mixer, and a rotary pump for separately feeding the liquid in each liquid storage tank to the mixer. .
[0002]
[Prior art]
In the production of fruit juice beverages, lactic acid beverages, and other beverage liquids, a liquid mixing device for adjusting and mixing a concentrate of the beverage liquid and water for diluting it to a predetermined concentration Water is sucked directly by a rotary pump and sent to a mixer. In this case, the rotary pump is used as a pump because the rotary pump does not come into contact with metal like a vane pump, plunger pump, gear pump, etc. This is because the powder is mixed in as a foreign substance in the liquid), and the structure is simple, the cleaning can be performed easily and hygienically, and the leakage rate is lower than other pumps.
[0003]
[Problems to be solved by the invention]
In the conventional liquid mixing apparatus, as described above, the liquid in each liquid storage tank is directly sucked by the rotary pump and fed to the mixer, but this rotary pump also causes liquid leakage. There is a problem that the liquid supply flow rate to the mixer fluctuates due to the liquid leakage, and the mixing ratio of the liquid fluctuates, thereby reducing the mixing accuracy. SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid mixing apparatus capable of improving the mixing accuracy by always maintaining a liquid supply flow rate supplied to a mixer by a rotary pump.
[0004]
[Means for Solving the Problems]
The invention according to claim 1 includes a plurality of liquid storage tanks 1, 2, a mixer 3, and rotary pumps 4, 5 that individually feed the liquid in each of the liquid storage tanks 1, 2 to the mixer 3. In the liquid mixing apparatus, relay tanks 6 and 7 are provided between the liquid storage tanks 1 and 2 and the rotary pumps 4 and 5 for feeding the liquid in the tanks 1 and 2 to the mixer 3, and the liquid storage Control means 8 and 9 are provided for controlling the liquid level of the liquid supplied from the tanks 1 and 2 to the relay tanks 6 and 7 to be substantially constant at all times. Level sensors 18 and 19 for detecting the position, and on the basis of signals detected by the sensors 18 and 19, the opening / closing provided in the pipes 12 and 13 connecting the liquid storage tanks 1 and 2 and the relay tanks 6 and 7. By opening and closing the valves 15 and 17 through the motors 14 and 16 as appropriate. Characterized by comprising a control unit 20 and 21 for liquid level relay tank 6 is always controlled to be substantially constant.
[0005]
The invention according to claim 2 includes a plurality of storage tanks 1, 2, a mixer 3, and rotary pumps 4, 5 that individually feed the liquid in each of the storage tanks 1, 2 to the mixer 3. In the liquid mixing apparatus, relay tanks 6 and 7 are provided between the liquid storage tanks 1 and 2 and the rotary pumps 4 and 5 for feeding the liquid in the tanks 1 and 2 to the mixer 3, and the liquid storage Control means 8 and 9 are provided for controlling the liquid level of the liquid supplied from the tanks 1 and 2 to the relay tanks 6 and 7 to be substantially constant at all times. Liquid level sensors 18 and 19 for detecting the position, and a liquid supply pump 22 provided in the pipelines 6 and 7 connecting the liquid storage tanks 1 and 2 and the relay tanks 6 and 7 based on a signal detected by the sensors. , 23 by repeating the stop and start appropriately, the relay tank 6, Characterized by comprising the liquid level is always control unit 20 and 21 be controlled to be substantially constant.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a block diagram showing the entire liquid mixing apparatus according to the present invention. In FIG. 1, 1 and 2 are liquid storage tanks for storing different liquids, and 3 is a mixer comprising a line mixer, for example. Reference numerals 4 and 5 denote rotary pumps for feeding the liquid from the liquid storage tanks 1 and 2 to the mixer 3, respectively. A relay tank 6 is provided between the liquid storage tank 1 and the rotary pump 4, and a relay tank 7 is provided between the liquid storage tank 2 and the rotary pump 5.
[0008]
In FIG. 1, reference numeral 8 denotes control means for controlling the liquid level of the liquid L1 supplied from the liquid storage tank 1 to the relay tank 6 to be substantially constant, and reference numeral 9 denotes the liquid tank 2 to the relay tank 7 . This is a control means for controlling the liquid level of the supplied liquid L2 to be substantially constant at all times. Reference numerals 10 and 11 are check valves provided between the rotary pumps 4 and 5 and the mixer 3, which are normally closed by a spring, and are pushed open when the discharge side of the rotary pumps 4 and 5 exceeds a certain pressure. The valve opens.
[0009]
The liquid storage tank 1 is installed at a position sufficiently higher than the relay tank 6, and the liquid L 1 in the liquid storage tank 1 flows down the pipe line 12 due to its gravity and is supplied to the relay tank 6. Yes. An opening / closing valve 15 that is opened and closed by a motor 14 is provided in the middle of the pipe 12. The liquid storage tank 2 is also installed at a position sufficiently higher than the relay tank 7, and the liquid L2 in the liquid storage tank 2 also flows down the pipe line 13 due to its gravity and is supplied to the relay tank 7. In addition, an opening / closing valve 17 that is driven to open and close by a motor 16 is provided in the middle of the pipeline 13. In FIG. 1, reference numerals 26 and 27 denote conduits that connect the liquid storage tanks 1 and 2 and the mixer 3, respectively.
[0010]
The control means 8 on the relay tank 6 side connects the liquid tank 1 and the relay tank 6 based on a liquid level sensor 18 for detecting the liquid level in the relay tank 6 and a detection signal detected by the liquid level sensor 18. And a control unit 20 that controls the liquid level of the relay tank 6 to be a substantially constant liquid level by appropriately opening and closing the on-off valve 15 provided in the connecting pipe 12. Further, the control means 9 on the relay tank 7 side includes a liquid level sensor 19 for detecting the liquid level in the relay tank 7, and a liquid storage tank 2 and a relay tank 7 based on a detection signal detected by the liquid level sensor 19. And a control unit 21 that controls the liquid level of the relay tank 7 to be a substantially constant liquid level by appropriately opening and closing the on-off valve 17 provided in the pipe line 13 connecting the two.
[0011]
As the liquid level sensors 18 and 19, various liquid level sensors such as a capacitance type, an electrode type liquid, and a hydraulic type can be used. Here, a capacitance type liquid level sensor is used. The liquid level sensor 18 on the relay tank 6 side inserts the two electrodes 18a and 18b into the liquid, and detects the liquid level based on the capacitance between the part that touches the liquid and the part that does not touch the liquid. Yes. When one of the electrodes 18a detects the upper limit liquid level H 1H of the relay tank 6 during use of the liquid mixing apparatus, the control unit 20 controls the motor 14 to close the on-off valve 15 based on the detection signal. As a result, the liquid level of the relay tank 6 is lowered, and when the other electrode 18b detects the lower limit liquid level H 1L of the relay tank 6, the control unit 20 controls to open the on-off valve 15; As a result, the liquid level in the relay tank 6 rises. Thereafter, the liquid level in the relay tank 6 is always kept substantially constant by repeating the same operation.
[0012]
Capacitive liquid level sensor 19 of the relay tank 7 side, exactly the same as the liquid level sensor 18, one electrode 19a detects the upper limit liquid level H 2H relay tank 7, a lower limit liquid the other electrode 19b The position H 2L is detected. When the upper limit liquid level H 2H of the relay tank 7 is detected by the liquid level sensor 19, the control unit 21 controls the motor 16 so as to close the on-off valve 17, whereby the liquid level of the relay tank 7 is lowered, and by other electrode 19b detects the lower limit liquid level H 2L relay tank 7, the control unit 21 controls to open the on-off valve 17, thereby raises the liquid level in the relay tank 7, after the above operation By repeating the above, the liquid level in the relay tank 7 is always kept substantially constant.
[0013]
When the liquid mixing device having the above-described configuration is used to mix the liquid L1 in the liquid storage tank 1 and the liquid L2 in the liquid storage tank 2 at a predetermined ratio to continuously produce the liquid mixture, a rotary pump When the liquid L1 from the storage tank 1 and the liquid L2 from the storage tank 2 are respectively supplied to the mixer 3 by operating 4 and 5 at a predetermined rotation speed, the liquid L1 in the storage tank 1 is transferred to the relay tank. 6 and the control means 8 always keeps the liquid level of the relay tank 6 at a substantially constant liquid level between the upper limit liquid level H 1H and the lower limit liquid level H 1L. L2 is also supplied to the relay tank 7, and the liquid level of the relay tank 7 is always kept at a substantially constant liquid level between the upper limit liquid level H 2H and the lower limit liquid level H 2L by the control means 9.
[0014]
Thus, the liquid levels in the relay tanks 6 and 7 are always maintained at a substantially constant liquid level, so that the liquid L1 in the relay tank 6 is always sent to the rotary pump 4 at a substantially constant pressure and discharged from the rotary pump 4. The discharge flow rate of the liquid L1 is always substantially constant, and therefore the supply flow rate of the liquid L1 fed to the mixer 3 is always substantially constant. Similarly, the liquid L2 in the relay tank 7 is always sent to the rotary pump 5 at a substantially constant pressure, and the discharge flow rate of the liquid L2 discharged from the rotary pump 5 is always substantially constant. The flow rate of the liquid L1 is always substantially constant.
[0015]
As described above, since the liquids L1 and L2 in the relay tanks 6 and 7 are always sent to the rotary pumps 4 and 5 at a substantially constant pressure, the discharge flow rates of the liquids L1 and L2 discharged from the rotary pumps 4 and 5 are always constant. The liquids L1 and L2 are always fed to the mixer 3 at a substantially constant flow rate so that the mixing ratio of the liquid in the mixer 3 does not change, and therefore mixing at a predetermined concentration with high mixing accuracy. The liquid can be produced continuously.
[0016]
In the embodiment described above, the liquid storage tanks 1 and 2 are installed at a position sufficiently higher than the relay tanks 6 and 7, and the liquids L1 and L2 of the liquid storage tanks 1 and 2 are connected to the relay tanks 6 and 7 by the pipes 12 and 13. When the liquid storage tanks 1 and 2 are installed at the same level as or lower than the relay tanks 6 and 7, as shown by phantom lines in FIG. The liquid supply pumps 22 and 23 are provided in the middle of the pipes 12 and 13 connecting the liquid storage tanks 1 and 2 and the relay tanks 6 and 7 in place of the on-off valves 15 and 17. The liquids L1 and L2 in the tanks 1 and 2 can be supplied to the relay tanks 6 and 7, respectively.
[0017]
As shown in FIG. 1, the control means 8 and 9 in the case where the liquid feed pumps 22 and 23 are provided in the pipes 12 and 13 connecting the liquid storage tanks 1 and 2 and the relay tanks 6 and 7 are as shown in FIG. Liquid level sensors 18 (electrodes 18a and 18b) and 19 (electrodes 19a and 19b) for detecting liquid levels 6 and 7 and the liquid supply pumps 22 and 22 based on detection signals detected by the sensors 18 and 19 The control units 20 and 21 are configured to control the liquid level of the relay tanks 6 and 7 to be substantially constant at any time by repeatedly stopping and starting 23.
[0018]
In this case, when the liquid L1 in the liquid storage tank 1 is supplied to the relay tank 6 and the liquid level in the relay tank 6 reaches the upper limit liquid level H1H , this is detected by the one electrode 18a, and the controller 21 controls to stop the motor 24 and stop the liquid supply pump 22, whereby the liquid level of the relay tank 6 is lowered, and when the other electrode 18 b detects the lower limit liquid level H 1L of the relay tank 6. Then, the motor 23 is actuated to start the liquid supply pump 22, thereby raising the liquid level in the relay tank 6. Thereafter, the liquid level in the relay tank 6 is always kept substantially constant by repeating the above operation.
[0019]
Further, when the liquid level of the relay tank 7 reaches the upper limit liquid level H 2H due to the supply of the liquid L2 from the liquid storage tank 2 to the relay tank 7, this is detected by the one electrode 19a, and the controller 21 detects the motor. 25, the liquid supply pump 23 is controlled to be stopped, whereby the liquid level of the relay tank 7 is lowered, and when the other electrode 19b detects the lower limit liquid level H 2L of the relay tank 7, the motor 25 is activated. Then, since the liquid supply pump 23 is activated, the liquid level of the relay tank 7 rises, and thereafter, the liquid level of the relay tank 7 is always kept substantially constant by repeating the above operation.
[0020]
Although the above embodiment demonstrated the case where two liquid storage tanks 1 and 2, the relay tanks 6 and 7, and the rotary pumps 4 and 5 respectively send and mix two types of liquids to the mixer 3, The liquid mixing apparatus according to the present invention is not limited to mixing two types of liquids, and includes cases where three or more types of liquids are mixed. In that case, three or more liquid storage tanks, relay tanks, and rotary units are used. A pump is provided, and the operational effects are the same as in the above-described embodiment. In the embodiment, the on-off valves 15 and 17 are driven to open and close by the motors 14 and 16. However, the on-off valves 15 and 17 may be driven to open and close by a hydraulic cylinder.
[0021]
【The invention's effect】
According to the first aspect of the present invention, in a liquid mixing apparatus comprising a plurality of liquid storage tanks, a mixer, and a rotary pump for feeding the liquid in each liquid storage tank to the mixer, By providing a relay tank between the rotary pump and the control means for controlling the liquid level of the liquid supplied from the liquid storage tank to the relay tank to be substantially constant at all times, the liquid in each liquid storage tank Since the liquid pressure supplied to the relay tank is maintained at a substantially constant liquid level and sent to the rotary pump is thereby substantially constant, the discharge flow rate of the rotary pump becomes substantially constant, The flow rate of the liquid fed from the tank to the mixer hardly fluctuates. Therefore, a plurality of types of liquids can be accurately mixed at a predetermined mixing ratio, and the mixing accuracy can be improved.
[0022]
The present invention is effective when each liquid storage tank is installed at a position higher than the relay tank , and the liquid in each liquid storage tank can be supplied to the relay tank in a gravity flow manner. In this case, the liquid tank and the relay are relayed. For example, a motor-driven on-off valve may be provided on the pipe connecting the tanks. Control means in this case, a liquid level sensor for detecting the liquid level of the RELAY tank, based on the detection signal detected by the level sensor, based on a signal detected by the sensor, and the liquid storage tank by opening and closing the on-off valve provided in the conduit connecting the relay tank properly, and a control unit for liquid level relay tank is always controlled to be substantially constant.
[0023]
The invention according to claim 2 is effective when the liquid storage tank is installed at the same level as or lower than that of the relay tank, and the pipe connecting the liquid storage tank and the relay tank is the above-mentioned of the invention according to claim 1 A liquid feed pump is provided in place of the on-off valve, and the liquid in the liquid storage tank is supplied to the relay tank by this pump . In this case, the control means includes a liquid level sensor for detecting the liquid level in the relay tank, and a stop of the liquid supply pump provided in the pipeline connecting the liquid storage tank and the relay tank based on a signal detected by the sensor. and by causing repeated activation appropriately, and a control unit for liquid level relay tank is always controlled to be substantially constant.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an entire liquid mixing apparatus according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 2 Liquid storage tank 3 Mixer 4, 5 Rotary pump 6, 7 Relay tank 8, 9 Control means 15, 16 On-off valve 18, 19 Liquid level sensor 20, 21 Control part

Claims (2)

複数の貯液タンクと、混合機と、各貯液タンクの液体を混合機に各別に送給するロータリーポンプとを備えてなる液体混合装置において、
各貯液タンクとこのタンクの液体を混合機に送給するロータリーポンプとの間に中継タンクを設けると共に、貯液タンクから中継タンクに供給される液体の液位が常に略一定になるように制御する制御手段を設け、制御手段は、中継タンクの液位を検出する液位センサーと、このセンサーにより検出される信号に基づいて、貯液タンクと中継タンクとをつなぐ管路に設けた開閉弁をモーターを介して適宜開閉させることにより、中継タンクの液位が常に略一定になるように制御する制御部とからなる液体混合装置。In a liquid mixing apparatus comprising a plurality of liquid storage tanks, a mixer, and a rotary pump for separately feeding the liquid in each liquid storage tank to the mixer,
A relay tank is provided between each storage tank and the rotary pump that feeds the liquid in this tank to the mixer, and the liquid level supplied from the storage tank to the relay tank is always substantially constant. setting only, the control means control means for controlling includes a liquid level sensor for detecting the liquid level of the relay tank, based on the signal detected by the sensor, provided in the conduit connecting the reservoir tank and the relay tank A liquid mixing apparatus comprising a control unit that controls an opening / closing valve to be opened / closed appropriately via a motor so that the liquid level in the relay tank is always substantially constant . 複数の貯液タンクと、混合機と、各貯液タンクの液体を混合機に各別に送給するロータリーポンプとを備えてなる液体混合装置において、
各貯液タンクとこのタンクの液体を混合機に送給するロータリーポンプとの間に中継タンクを設けると共に、貯液タンクから中継タンクに供給される液体の液位が常に略一定になるように制御する制御手段を設け、制御手段は、中継タンクの液位を検出する液位センサーと、このセンサーにより検出される信号に基づいて、貯液タンクと中継タンクとをつなぐ管路に設けた液体供給ポンプの停止と起動を適宜繰り返させることにより、中継タンクの液位が常に略一定になるように制御する制御部とからなる液体混合装置。In a liquid mixing apparatus comprising a plurality of liquid storage tanks, a mixer, and a rotary pump for separately feeding the liquid in each liquid storage tank to the mixer,
A relay tank is provided between each storage tank and the rotary pump that feeds the liquid in this tank to the mixer, and the liquid level supplied from the storage tank to the relay tank is always substantially constant. setting only, the control means control means for controlling includes a liquid level sensor for detecting the liquid level of the relay tank, based on the signal detected by the sensor, provided in the conduit connecting the reservoir tank and the relay tank A liquid mixing apparatus including a control unit that controls the liquid level of the relay tank to be always substantially constant by appropriately stopping and starting the liquid supply pump .
JP2002087316A 2002-03-27 2002-03-27 Liquid mixing device Expired - Fee Related JP3761483B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130038800A (en) * 2010-04-08 2013-04-18 신토고교 가부시키가이샤 A circulating-type dispersing system and a method therefor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130038800A (en) * 2010-04-08 2013-04-18 신토고교 가부시키가이샤 A circulating-type dispersing system and a method therefor
KR101718379B1 (en) * 2010-04-08 2017-03-21 신토고교 가부시키가이샤 A circulating-type dispersing system and a method therefor

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