【発明の詳細な説明】［産業上の利用分野］本発明は広範囲なフローレイトにおいて定流徂送液を可
能にした送液ポンプの制御方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method of controlling a liquid pump that enables constant flow of liquid over a wide range of flow rates.
［従来の技術］一定の流量で液体を送液する場合には、定流量送液ポン
プが用いられる。[Prior Art] When sending liquid at a constant flow rate, a constant flow liquid sending pump is used.
従来、この様なポンプとしては、例えば、第４図に示す
如きダブルプランジャー型ポンプが使用されている。図
において、ＩＡ、１Ｂは夫々第１゜第２ハートカムで、
該各々のカムのシャフト２は、第５図に示す様に一体化
されて、モータ３のシャフトに固定されている。又、前
記ハートカム１Ａ。Conventionally, as such a pump, for example, a double plunger type pump as shown in FIG. 4 has been used. In the figure, IA and 1B are the 1st and 2nd heart cams, respectively.
The shafts 2 of the respective cams are integrated and fixed to the shaft of the motor 3, as shown in FIG. Also, the heart cam 1A.
１Ｂは合同で第６図に示す様に軸Ｘに対し対称形をなし
、互いに１８０°位相をずらして配置されており、夫々
第１．第２０−ラ４Ａ、４Ｂが接触している。該第１．
第２０−ラ４Ａ、４Ｂは夫々第１．第２プランジャ５Ａ
、５Ｂに接続されている。第１．第２プランジャ５Ａ、
５Ｂは前記モータ３の回転に同期して回転する前記第１
．第２ハートカム１Ａ、１Ｂの運動により、夫々第１．
第２ポンプ室６Ａ、６Ｂ内で直線往復運動する。該第１
．第２プランジヤの運動は互いに方向が１８．０°ずれ
ており、例えば、第１プランジヤ５Ａが右方向（矢印Ｐ
Ａ）に動き、液体が液槽７がら第１ポンプ室６Ａ内に吸
入されると同時に、第２プランジヤ５Ｂが左方向（矢印
Ｐａ）に動き、第２ポンプ室６Ｂ内の液が外部へ吐出さ
れる。次に、第１プランジ１７５Ａが左方向く矢印ＱＡ
）に動き、第１ポンプ室６Ａ内の液を外部へ吐出すると
同時に、第２プランジヤ５Ｂが右方向（矢印ＱＢ）に動
き、液槽７から第２ポンプ苗６Ｂ内へ液を吸入する。尚
、図中８ａ 、 ８ｂ 、 ８ｃ 、 ８ｄ ハフラン
ジャの動きによって、液路中で浮いたり沈んだりして、
液を流したり、止めたりするボールである。1B are congruently symmetrical with respect to the axis X as shown in FIG. 6, and are arranged 180 degrees out of phase with each other, respectively. The 20th-ra 4A and 4B are in contact. Part 1.
The 20th-ra 4A and 4B are the 1st. Second plunger 5A
, 5B. 1st. second plunger 5A,
5B is the first motor rotating in synchronization with the rotation of the motor 3;
．． Due to the movement of the second heart cams 1A and 1B, the first heart cams 1A and 1B respectively move.
It performs linear reciprocating motion within the second pump chambers 6A and 6B. The first
．． The directions of the movements of the second plungers are 18.0° shifted from each other. For example, the movements of the first plunger 5A are shifted to the right (arrow P
A), and the liquid is sucked into the first pump chamber 6A from the liquid tank 7. At the same time, the second plunger 5B moves to the left (arrow Pa), and the liquid in the second pump chamber 6B is discharged to the outside. be done. Next, the first plunge 175A moves to the left as shown by the arrow QA.
) to discharge the liquid in the first pump chamber 6A to the outside, and at the same time, the second plunger 5B moves to the right (arrow QB) and sucks the liquid from the liquid tank 7 into the second pump seedling 6B. In addition, due to the movement of the flangers 8a, 8b, 8c, and 8d in the figure, they float or sink in the liquid path,
A ball that allows liquid to flow or stop.
又、９Ａ、９Ｂは夫々前記第１．第２プランジャ５Ａ、
５Ｂを第１．第２ハートカムに接触させるようにした圧
縮バネである。以上の如く、第１プランジヤ５Ａと第２
プランジヤ５Ｂの運動が１８０°ずれて行われるので、
第１ポンプ室６Ａの液の吸入と第２ポンプ室６Ｂの液の
吐出が同時に行われ、更に連続して第１ポンプ室６Ａの
液の吐出と第２ポンプ室６Ｂの吸入が同時に行なわれる
。Moreover, 9A and 9B are the above-mentioned No. 1. second plunger 5A,
5B as the first. This is a compression spring that is brought into contact with the second heart cam. As described above, the first plunger 5A and the second plunger
Since the movement of the plunger 5B is performed with a 180° deviation,
The liquid is sucked into the first pump chamber 6A and the liquid is discharged from the second pump chamber 6B at the same time, and subsequently, the liquid is discharged from the first pump chamber 6A and the liquid is sucked into the second pump chamber 6B at the same time.
第７図（ａ ＞はその様子を示したもので、横軸がｆＲ
間又はカムの回転角を示し、縦軸がプランジャの変位、
即ち、プランジャとローラの接触点と基礎円（第６図Ｆ
）との距離を示す。実線が第１プランジヤ５Ａの変位を
示し、破線が第２プランジヤ５Ｂの変位を示す。ＳＡ１
とＳＡ３は第１ポンプ室６Ａの吸入用、ＳＢ１と８８３
は第２ポンプ室６Ｂの吐出用、ＳＡ２とＳＡ４は第１ポ
ンプ室６Ａの吐出用、ＳＢ２とＳＢ４は第２ポンプ室６
Ｂの吸入用を示す。第７図（ｂ）は単位時間当りの流出
路から外部への液の流出量を示したもので、実線が第１
ポンプ室での吐出によるもの、破線が第２ポンプ室での
吐出によるもので、理想的には時間軸に平行、即ち、一
定流出曇になる筈である。Figure 7 (a) shows this situation, and the horizontal axis is fR.
The vertical axis represents the displacement of the plunger, and the rotation angle of the cam.
That is, the contact point of the plunger and roller and the base circle (Fig. 6F)
). A solid line indicates the displacement of the first plunger 5A, and a broken line indicates the displacement of the second plunger 5B. SA1
and SA3 are for suction of the first pump chamber 6A, SB1 and 883
is for the discharge of the second pump chamber 6B, SA2 and SA4 are for the discharge of the first pump chamber 6A, and SB2 and SB4 are for the discharge of the second pump chamber 6.
B is shown for inhalation. Figure 7(b) shows the amount of liquid flowing out from the outflow path per unit time, and the solid line is the first one.
The broken line is due to the discharge in the pump chamber, and the broken line is due to the discharge in the second pump chamber. Ideally, it should be parallel to the time axis, that is, it should be a constant outflow cloud.
しかしながら、実際には、ポンプの吐出側に圧力が掛っ
ているので、第１プランジヤによる吸入（又は吐出）工
程と第２プランジヤによる吐出（又は吸入）工程が夫々
吐出（又は吸入）工程、吸入（又は吐出）工程へ変わる
時に、第１プランジヤ（又は第２プランジヤ）の変位に
対し、第１ポンプ室（又は第２ポンプ室）からの液の吐
出に遅れが住じ、第７図（ｂ ）のＤ１〜Ｄ４に示す様
に、第１ポンプ（又は第２ポンプ室）の流路から外部へ
の単位時間当りの流出量が、工程の変わった直後少時間
、落ちてしまう。この現象は、ポンプ室内は吸入時に圧
力が零に近く、吐出工程に変わる時にプランジャの運動
により高圧に達しようとするが、ポンプの吐出側に圧力
が掛かつているのでポンプ室外の流出路の圧力を直ぐ越
すことは出来ず、越すまでの間、カムやプランジャは変
位しても、ポンプ室から流出路への液の吐出が無いから
である。この流出量の低下により、流出路の外部に、例
えば液体クロマトグラフ装置の測定カラムが繋がってい
れば、測定結果のスペクトルのベースラインに脈動が生
じてしまい、正確な測定が妨げられてしまう。特に、ポ
ンプ室外の流出路の圧力が高くなるにつれ、この現象が
顕著である。However, in reality, pressure is applied to the discharge side of the pump, so the suction (or discharge) process by the first plunger and the discharge (or suction) process by the second plunger are the discharge (or suction) process and the suction (or suction) process, respectively. (or discharge) process, there is a delay in the discharge of liquid from the first pump chamber (or second pump chamber) with respect to the displacement of the first plunger (or second plunger), as shown in Fig. 7(b). As shown in D1 to D4, the flow rate per unit time from the flow path of the first pump (or second pump chamber) to the outside drops for a short time immediately after the process is changed. This phenomenon occurs because the pressure in the pump chamber is close to zero during suction, and when the pump enters the discharge process, it attempts to reach high pressure due to the movement of the plunger, but since pressure is applied to the discharge side of the pump, the pressure in the outflow path outside the pump chamber increases. This is because the liquid cannot be discharged from the pump chamber to the outflow path even if the cam or plunger is displaced until it is exceeded. If a measurement column of a liquid chromatograph device is connected to the outside of the outflow path, for example, this decrease in the outflow amount causes pulsations in the baseline of the spectrum of the measurement result, which impedes accurate measurement. This phenomenon is particularly noticeable as the pressure in the outflow path outside the pump chamber increases.
さて、耐圧力に対しての定流量性の精度は、ポンプスト
ロークの周期（プランジャの変位の周期）を大きくすれ
ば高める事が出来る。即ち、該ポンプストロークの周期
を小さくすれば、前記単位時間当りの流量の低下の程度
は大きくなり、ポンプストロークの周期を大きくすれば
、流量の低下の程度は小さくなるので、ポンプストロー
クの周期を大きくして単位時間当りの耐圧流量の低下の
程度を小さくしている。Now, the accuracy of the constant flow rate with respect to withstand pressure can be improved by increasing the pump stroke cycle (the plunger displacement cycle). That is, if the period of the pump stroke is made smaller, the degree of decrease in the flow rate per unit time will be increased, and if the period of the pump stroke is increased, the degree of decrease in the flow rate will be decreased. By increasing the flow rate, the degree of decrease in pressure-resistant flow rate per unit time is reduced.
［発明が解決しようとする問題点コしかし、ポンプストロークを大きくした場合には、単位
時間当りの耐圧定流量性が向上するが、フローレイトが
小さくなる程、圧力リップルが大きくなる。例えば、１
分当り１ｍＡ程度又はそれ以上の７０−レイトで液を送
る場合には、耐圧定流ｍ性も低下せず、リップルも小さ
い。しかし、１分当り０．１１Ｑ、以下のフローレイト
で液を送る場合には、ポンプのリップルの周期が１分程
度と大きくなり、ダンパーを使用しても該リップルを平
滑出来ない。又、グラジェント溶出の様に、２種類以上
の液体を混合するような系において、前記の如くストロ
ークを大きくした場合には、該２つの液の混合比を連続
的に変化させる場合に、該２つの液が所定の混合比で混
合されない為に、検出時のスペクトルのベースライン上
にリップルが発生する。[Problems to be Solved by the Invention] However, when the pump stroke is increased, the pressure constant flow performance per unit time is improved, but the smaller the flow rate is, the larger the pressure ripple becomes. For example, 1
When the liquid is fed at a rate of about 1 mA per minute or more at a rate of 70°, the pressure resistance and constant flow characteristics do not deteriorate, and the ripples are small. However, when sending liquid at a flow rate of 0.11Q per minute or less, the ripple period of the pump becomes as large as about 1 minute, and even if a damper is used, the ripples cannot be smoothed out. Furthermore, in a system where two or more types of liquids are mixed, such as in gradient elution, when the stroke is increased as described above, when the mixing ratio of the two liquids is continuously changed, Since the two liquids are not mixed at a predetermined mixing ratio, ripples occur on the baseline of the spectrum during detection.
本発明はこの様な問題を解決する事を目的としたもので
、新規な送液ポンプの制御方法を提供するものである。The present invention aims to solve such problems and provides a novel method for controlling a liquid pump.
［問題点を解決するための手段］本発明は、カム駆動機構により作動するカムの動きによ
りポンプ室内でプランジャを直線往復運動させて、外部
から該ポンプ室内への液を吸入と該ポンプ室内から外部
への液の吐出を行ない、連続的に液の送液を行なう方法
において、カムの回転角度をフロウレイトに応じて選択
し、該選択した回転角度で左回転と右回転を交互に繰返
す様にした送液ポンプ制御方法である。[Means for Solving the Problems] The present invention causes a plunger to linearly reciprocate within a pump chamber by the movement of a cam operated by a cam drive mechanism, thereby sucking liquid into the pump chamber from the outside and sucking liquid from the pump chamber. In the method of discharging liquid to the outside and continuously feeding the liquid, the rotation angle of the cam is selected according to the flow rate, and counterclockwise rotation and clockwise rotation are alternately repeated at the selected rotation angle. This is a liquid pump control method.
［作用］フローレイトに対応してカムの回転角を選択する。例え
ば、フローレイトが小さい場合にはカムの回転角を小さ
くし、フローレイトが大きい場合には回転角を大きくす
る。この場合、回転角を小さくした侭でフローレイトを
大きくすると、カムを回転させるモータの速度を極めて
大きくしなければならず、実現不可能となる。この様に
７０−レイトに応じてカムの回転角を選択し、該選択し
た回転角度で左回転と右回転を繰返す様にすれば、広範
囲の７０−レイトにおいて、ａ圧下においても、ノイズ
が無く、定量性良く送液が出来る。[Operation] Selects the rotation angle of the cam according to the flow rate. For example, when the flow rate is small, the rotation angle of the cam is made small, and when the flow rate is large, the rotation angle is made large. In this case, if the flow rate is increased while the rotation angle is decreased, the speed of the motor that rotates the cam must be extremely increased, which is impossible. In this way, by selecting the rotation angle of the cam according to the 70-rate and repeating left and right rotations at the selected rotation angle, there will be no noise over a wide range of 70-rates, even under pressure a. , liquid can be delivered with good quantitative properties.
［実施例］第１図は本発明の一実施例を示した定流量ポンプ装置の
概略図である。[Embodiment] FIG. 1 is a schematic diagram of a constant flow pump device showing an embodiment of the present invention.
図中前記第１図にて使用した番号及び記号と同一の番・
号及び記号を付したものは同一構成要素を表わす。該第
１図において、第１ポンプ室６Ａの吐出路ＯＡと第２ポ
ンプ室６Ｂの吸入路ＩＢが繋がっている。又、第１ハー
トカム１Ａ、第２ハートカム１Ｂには夫々別のシャフト
２Ａ、２Ｂが設けられており。該夫々のカムはモータ３
Ａ、３Ｂのシャフトに繋がっている。該モータは制御装
置１０からの指令に基づいて作動する。該指令の１つは
、設定されたフロウレイトに対応したカムの回転角を定
める指令である。前記第２ポンプ至６Ｂの吐出路ＯＢに
は圧力計１１が設けられており、前記制御装置１０は該
圧力計からの圧力情報に基づいて圧力波形の傾きを求め
、該傾きに基づいて、前記各モータに指令を送る。該ポ
ンプ装置において、第２プランジヤ５Ｂが液体を外部に
吐出する機能を持ち、第１プランジヤ５Ａが該第２プラ
ンジヤ５Ｂに適宜加圧した液体を送る機能を持っている
。そして、これらのプランジャは夫々独立に動作する。The numbers and symbols in the figure are the same as those used in Figure 1 above.
Items with numbers and symbols represent the same constituent elements. In FIG. 1, the discharge passage OA of the first pump chamber 6A and the suction passage IB of the second pump chamber 6B are connected. Further, the first heart cam 1A and the second heart cam 1B are provided with separate shafts 2A and 2B, respectively. Each cam is connected to motor 3
It is connected to shafts A and 3B. The motor operates based on commands from the control device 10. One of the commands is a command to determine the rotation angle of the cam corresponding to the set flow rate. A pressure gauge 11 is provided in the discharge passage OB of the second pump to 6B, and the control device 10 determines the slope of the pressure waveform based on pressure information from the pressure gauge, and based on the slope, Send commands to each motor. In this pump device, the second plunger 5B has a function of discharging liquid to the outside, and the first plunger 5A has a function of sending suitably pressurized liquid to the second plunger 5B. These plungers operate independently.
この様に構成された定流量送液ポンプの動作を次に説明
する。The operation of the constant flow liquid transfer pump configured in this manner will be described next.
予め、７０−レイトに対応したカムの回転角に関する指
令信号を制御装置１０はモータ３Ａ、３Ｂに送っておく
。即ち、フローレイトが小さければ、それに応じてカム
の回転角を小さくし、フローレイトが大きければ、それ
に応じてカムの回転角を大きくする信号を供給する。そ
して、該選択された回転角でカムを左と右に交互に繰返
して回転させる。この場合、例えば、右回転の時、吸引
工程を行ない、左回転の時、吐出工程を行なう。In advance, the control device 10 sends a command signal regarding the rotation angle of the cam corresponding to the 70-rate to the motors 3A and 3B. That is, if the flow rate is small, the rotation angle of the cam is decreased accordingly, and if the flow rate is large, a signal is supplied that increases the rotation angle of the cam accordingly. Then, the cam is repeatedly rotated alternately to the left and right at the selected rotation angle. In this case, for example, when rotating clockwise, a suction process is performed, and when rotating counterclockwise, a discharging process is performed.
第２図はプランジャの動作図を示したもので、横軸は時
間、縦軸は上方向が吐出量、下方向が吸入量を示す。該
図において、破線は第１プランジャ５Ａ、実線は第２プ
ランジヤ５Ｂの動作を示す。FIG. 2 shows a diagram of the operation of the plunger, in which the horizontal axis shows time, the vertical axis shows the discharge amount in the upper direction, and the suction amount in the lower direction. In the figure, the broken line indicates the operation of the first plunger 5A, and the solid line indicates the operation of the second plunger 5B.
該図から明らかなように、第１プランジヤ５Ａは吸入か
ら予備加圧の為の吐出を行なう工程→吐出工程→吸入か
ら予備加圧の為の吐出を行なう工程→吐出工程を繰り返
し、第２プランジヤ５Ｂはこれに同期して、吐出工程→
吸引工程→吐出工程→吸引工程を繰り返す。この様な工
程において、前記２つのポンプの動作特性は、図に示す
様に、第１ポンプは、ゆっくり吸引して素早く吐出し、
第２ポンプは素早く吸引してゆっくり吐出する。この理
由は、第１ポンプが吸引過程を行なう時、液槽７からの
液の供給圧力は一般に低いので、キャビテーションがポ
ンプ室内や弁で生じ易い。それは、特に、急速に吸引さ
れた時に生じ易く、このキャビテーションによって気泡
が生じ、動作を不規則にする。従って、第１ポンプの吸
引工程は極力ゆっくり行なうのが望ましい。一方、第２
ポンプは、吐出工程が実質的な送液工程であるから、吸
引−吐出の１サイクル時間中、吐出工程に多くの時間を
割き、吸引工程を出来る丈少なくする事が送液の連続性
を保つ。又、吸引過程では前記第１ポンプの吸引工程と
異なり、該第１ポンプからの液が強制的に送られて来て
おり、該第２ポンプの吸引側の圧力は大方その圧力に近
付いているので、キャビテーションが生じなく、その為
、非常に素早く吸引出来る。As is clear from the figure, the first plunger 5A repeats the process of suction and discharge for pre-pressurization → discharge process → suction and discharge for pre-pressurization → discharge process, and the second plunger 5B is synchronized with this and starts the discharge process →
Repeat the suction process → discharge process → suction process. In such a process, the operating characteristics of the two pumps are, as shown in the figure, the first pump sucks slowly and discharges quickly;
The second pump sucks in quickly and discharges slowly. The reason for this is that when the first pump performs the suction process, the supply pressure of the liquid from the liquid tank 7 is generally low, so cavitation is likely to occur in the pump chamber and the valves. It is particularly likely to occur when suction is applied rapidly; this cavitation creates bubbles and causes irregular operation. Therefore, it is desirable to perform the suction process of the first pump as slowly as possible. On the other hand, the second
In a pump, the discharge process is essentially the liquid delivery process, so it is important to spend a lot of time on the discharge process during one cycle of suction and discharge, and to shorten the length of the suction process to maintain continuity of liquid delivery. . Also, in the suction process, unlike the suction process of the first pump, the liquid from the first pump is forcibly sent, and the pressure on the suction side of the second pump is almost close to that pressure. Therefore, cavitation does not occur and suction can be performed very quickly.
又、第１プランジヤ５Ａによる液の吐出量Ｓ１は前記第
２プランジヤ５Ｂによる液の吸入量Ｓ２と、該第１プラ
ンジヤの吐出工程に要する時間と同一時間における第２
プランジヤ５Ｂの吐出量Ｓ３の和に等しい。これにより
、該第２ポンプ室６Ｂから連続して一定量の液が外部に
送液される。Further, the liquid discharge amount S1 by the first plunger 5A is equal to the liquid suction amount S2 by the second plunger 5B and the second
It is equal to the sum of the discharge amounts S3 of the plungers 5B. Thereby, a certain amount of liquid is continuously sent to the outside from the second pump chamber 6B.
更に、７０−レイトに応じてカムの回転角が変化するが
、該カムの回転角を小さくすれば、第２図において、吐
出量と吸入量がそれに応じて低くなり、カムの回転角が
大きくなれば、吐出量と吸入量は高くなる。しかし、こ
の吐出、吸引に要する時間は変化しない。Furthermore, the rotation angle of the cam changes according to the 70-rate, but if the rotation angle of the cam is made smaller, the discharge amount and suction amount will decrease accordingly in FIG. 2, and the rotation angle of the cam will become larger. If so, the discharge amount and suction amount will be high. However, the time required for this ejection and suction does not change.
又、この第１プランジヤ５Ａの予備圧縮加圧は、前の工
程で第１ポンプ室から吐出されて来た液を吸入した第２
ポンプ室が液を外部に吐出する工程に切換る時に該ポン
プ学内の液体の圧力を外部の圧力と同一にする為に行な
うものであり、該予備圧縮加圧時には、第１ポンプ室内
の液が圧縮加圧される丈で、第２ポンプ室に送られない
。Moreover, this preliminary compression pressurization of the first plunger 5A is performed by the second plunger which sucked the liquid discharged from the first pump chamber in the previous step.
This is done to make the pressure of the liquid in the pump chamber the same as the external pressure when the pump chamber switches to the process of discharging the liquid to the outside, and during the preliminary compression pressurization, the liquid in the first pump chamber is The length is compressed and pressurized and is not sent to the second pump chamber.
この予備圧縮加圧は第２ポンプ室６Ｂの吐出路に設けら
れた圧力計１１により、該第２ポンプ室から吐出される
液の圧力を検出し、制御装置１゜が該圧力計からの圧力
情報に基づいて圧力波形の傾き（即ち、第２ポンプ吐出
サイドにおける圧力速度）を求め、該傾きに基づいて、
前記各モータに指令を送る事により制御される。即ち、
実験によると、定常状態では該第２ポンプ室から吐出さ
れる液体の圧力波形は、第２プランジヤ５Ｂが吸引した
液体が外部の圧力（所定の吐出圧力）迄加圧されていな
いと（即ち、第２ポンプ室の実質的送液量（Ｊｒが第２
ポンプの設計送液量ＵＯより小さいと）、第３図（ａ）
に示す様に、右傾きとなり、該液体が外部の圧力よりも
高く加圧されていると（即ちＵｒ＞Ｕｏ）、第３°図（
Ｃ）Ｉｃ示す様に、左傾きとなる。この場合、これら傾
きの程度が外部の圧力の差に等しい。又、脈波の圧力が
外部圧力と等しい場合（即ちｊＪｒ −Ｕｏ ）には、
第３図（ｂ）に示す様に、傾き零、即ち時間軸に平行と
なる。This preliminary compression pressurization is performed by detecting the pressure of the liquid discharged from the second pump chamber 6B with a pressure gauge 11 provided in the discharge path of the second pump chamber 6B, and controlling the control device 1° to detect the pressure from the pressure gauge. Determine the slope of the pressure waveform (i.e., the pressure velocity at the second pump discharge side) based on the information, and based on the slope,
It is controlled by sending commands to each of the motors. That is,
According to experiments, in a steady state, the pressure waveform of the liquid discharged from the second pump chamber changes when the liquid sucked by the second plunger 5B is not pressurized to the external pressure (predetermined discharge pressure) (i.e., The actual amount of liquid sent to the second pump chamber (Jr is the second
If it is smaller than the pump's design flow rate UO), Fig. 3 (a)
As shown in Figure 3, if the liquid is pressurized higher than the external pressure (i.e., Ur>Uo), the slope will be to the right.
C) It tilts to the left as shown by Ic. In this case, the magnitude of these slopes is equal to the difference in external pressure. Also, when the pressure of the pulse wave is equal to the external pressure (i.e. jJr - Uo),
As shown in FIG. 3(b), the slope is zero, that is, parallel to the time axis.
しかして、制御装置１０は、前記圧力波形の傾きが前記
第３図（ａ ）に示す様に、右傾きなら、第１プランジ
ヤ５Ａを作動させるモータ３Ａに、該傾きが零になる程
度に、該第１プランジヤ５Ａの移動距離を適宜大きくし
、予備圧縮加圧を大きくする信号を供給するように指令
する。又、前記第３図（Ｃ）に示す様に、左傾きなら、
該傾きが零になる程度に、該第１プランジヤの移動距離
を適宜小さくし、予備圧縮加圧を小さくする信号を供給
するように指令する。尚、予め前記第１ポンプから第２
ポンプに該第２ポンプの必要液量より若干多めに送液し
、過剰分をリリースする定圧リリース弁を第１ポンプ室
６Ａの吐出路ＯＡと第２ポンプ室６Ｂの吸入路ＩＢとの
間に設け、このリリース弁の動作圧力を前記制御装＠１
０で制御して、前記第２ポンプ室内と空外の圧力を等し
くするようにしてもよい。Therefore, if the slope of the pressure waveform is to the right as shown in FIG. A command is given to appropriately increase the moving distance of the first plunger 5A and to supply a signal to increase the preliminary compression pressurization. Also, as shown in Figure 3 (C) above, if the tilt is to the left,
A command is given to appropriately reduce the moving distance of the first plunger and to supply a signal to reduce the preliminary compression pressurization to such an extent that the inclination becomes zero. Note that from the first pump to the second pump
A constant pressure release valve is provided between the discharge passage OA of the first pump chamber 6A and the suction passage IB of the second pump chamber 6B, which sends liquid to the pump in an amount slightly larger than that required by the second pump and releases the excess liquid. The operating pressure of this release valve is controlled by the control device @1.
The pressure inside the second pump chamber and the pressure outside the chamber may be equalized by controlling the pressure at zero.
又、本発明を前記第４図に示す如きダブルプランジャ型
ポンプに応用しても良いが、前記第１図に示す如きポン
プに比べ定圧送液性能が劣る。Further, the present invention may be applied to a double plunger type pump as shown in FIG. 4, but the constant pressure liquid feeding performance is inferior to that of the pump shown in FIG. 1.
［発明の効果］本発明は、設定すべきフローレイトに対応してカムの回
転角を選択し、該カムを該回転角で交互に左回転、右回
転するようにしているので、広範囲の７０−レイト（例
、１分当り０．１μ２〜２ｍＱ）において、高圧下にお
いても、ノイズ無く、定量性良く、微量送液が可能とな
る。[Effects of the Invention] The present invention selects the rotation angle of the cam in accordance with the flow rate to be set, and rotates the cam alternately to the left and right at the rotation angle. - At a low rate (e.g. 0.1 μ2 to 2 mQ per minute), even under high pressure, it is possible to send a minute amount of liquid without noise and with good quantitative performance.
又、グラジェント溶出の様に、２種類以上の液体を混合
するような系においても、所定の混合比率で、２つの液
を混合する事が出来、混合リップルか無くなる。Furthermore, even in systems where two or more types of liquids are mixed, such as in gradient elution, the two liquids can be mixed at a predetermined mixing ratio, eliminating mixing ripples.
第１図は本発明の送液ポンプの制御方法の一実施例を示
したポンプ装置の概略図、第２図、第３図は該ポンプ装
置の動作図、第４図及び第５図は従来のダブルプランジ
ャ型のポンプ機構の１例を示したもの、第６図は該ポン
プ機構に使用されるハートカムの平面図、第７図は前記
第４図及び第５図のポンプ機構の動作の説明を補足する
為に用いた図である。ＩＡ、１８：第１．第２ハートカム ２Ａ。２Ｂ＝シヤフト ３Ａ、３Ｂ：モータ ４Ａ。４Ｂ＝第１．第２０−ラ ５Ａ、５Ｂ：第１゜第２プ
ランジヤ ６Ａ、６Ｂ：第１．第２ポンプ室 ７：
液槽 ｆ３ａ、 ８ｂ、Ｑｃ、 ８ｄ ：ボール
９Ａ、９Ｂ：圧縮バネ １０：制御装置 １１：圧
力計 ＩＡ、ＩＢ：吸入路ＯＡ、０８：吐出路FIG. 1 is a schematic diagram of a pump device showing an embodiment of the liquid transfer pump control method of the present invention, FIGS. 2 and 3 are operation diagrams of the pump device, and FIGS. 4 and 5 are conventional diagrams. 6 is a plan view of a heart cam used in the pump mechanism, and FIG. 7 is an explanation of the operation of the pump mechanism shown in FIGS. 4 and 5. This is a diagram used to supplement. IA, 18: 1st. 2nd heart cam 2A. 2B=Shaft 3A, 3B: Motor 4A. 4B=1st. 20th-ra 5A, 5B: 1st ° 2nd plunger 6A, 6B: 1st. 2nd pump room 7:
Liquid tank f3a, 8b, Qc, 8d: Ball
9A, 9B: Compression spring 10: Control device 11: Pressure gauge IA, IB: Suction path OA, 08: Discharge path
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60018436AJPH0754114B2 (en) | 1985-02-01 | 1985-02-01 | Control method of liquid delivery pump |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60018436AJPH0754114B2 (en) | 1985-02-01 | 1985-02-01 | Control method of liquid delivery pump |
| Publication Number | Publication Date |
|---|---|
| JPS61178569Atrue JPS61178569A (en) | 1986-08-11 |
| JPH0754114B2 JPH0754114B2 (en) | 1995-06-07 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60018436AExpired - Fee RelatedJPH0754114B2 (en) | 1985-02-01 | 1985-02-01 | Control method of liquid delivery pump |
| Country | Link |
|---|---|
| JP (1) | JPH0754114B2 (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6295180U (en)* | 1985-12-06 | 1987-06-17 | ||
| US4808077A (en)* | 1987-01-09 | 1989-02-28 | Hitachi, Ltd. | Pulsationless duplex plunger pump and control method thereof |
| US4913624A (en)* | 1987-08-11 | 1990-04-03 | Hitachi, Ltd. | Low pulsation displacement pump |
| JP2010261461A (en)* | 2009-05-08 | 2010-11-18 | Lewa Gmbh | Method and device for uniforming conveying flow rate in positive displacement pump |
| JP2010276350A (en)* | 2009-05-26 | 2010-12-09 | Hitachi High-Technologies Corp | Liquid feeding device and liquid chromatograph device |
| WO2019021475A1 (en)* | 2017-07-28 | 2019-01-31 | 株式会社島津製作所 | Liquid feeding device |
| CN114636661A (en)* | 2022-03-04 | 2022-06-17 | 青岛瑞斯凯尔生物科技有限公司 | A liquid circuit system for quantitative analysis of cells and its working method |
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|---|---|---|---|---|
| JPS5133303A (en)* | 1974-09-13 | 1976-03-22 | Hitachi Ltd | TEIRYURYOSOEKIHONPUKEI |
| DE2725464A1 (en)* | 1977-06-04 | 1978-12-14 | Mueszeripari Muevek Lab | Pulsation-free feed pump for liq. chromatography analyser - has piston operated by cam having profile determined by given formula |
| JPS5585223A (en)* | 1978-12-22 | 1980-06-27 | Stanley Electric Co Ltd | Fixed quantity discharge method of fluid |
| JPS5618400U (en)* | 1979-07-18 | 1981-02-18 | ||
| JPS6073068A (en)* | 1983-08-31 | 1985-04-25 | グルプ・アンデユストリエル・ドウ・レアリザシオン・エ・ダプリカシオン・ジラ・エス・ア− | Liquid pump system |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5133303A (en)* | 1974-09-13 | 1976-03-22 | Hitachi Ltd | TEIRYURYOSOEKIHONPUKEI |
| DE2725464A1 (en)* | 1977-06-04 | 1978-12-14 | Mueszeripari Muevek Lab | Pulsation-free feed pump for liq. chromatography analyser - has piston operated by cam having profile determined by given formula |
| JPS5585223A (en)* | 1978-12-22 | 1980-06-27 | Stanley Electric Co Ltd | Fixed quantity discharge method of fluid |
| JPS5618400U (en)* | 1979-07-18 | 1981-02-18 | ||
| JPS6073068A (en)* | 1983-08-31 | 1985-04-25 | グルプ・アンデユストリエル・ドウ・レアリザシオン・エ・ダプリカシオン・ジラ・エス・ア− | Liquid pump system |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6295180U (en)* | 1985-12-06 | 1987-06-17 | ||
| US4808077A (en)* | 1987-01-09 | 1989-02-28 | Hitachi, Ltd. | Pulsationless duplex plunger pump and control method thereof |
| US4913624A (en)* | 1987-08-11 | 1990-04-03 | Hitachi, Ltd. | Low pulsation displacement pump |
| JP2010261461A (en)* | 2009-05-08 | 2010-11-18 | Lewa Gmbh | Method and device for uniforming conveying flow rate in positive displacement pump |
| JP2010276350A (en)* | 2009-05-26 | 2010-12-09 | Hitachi High-Technologies Corp | Liquid feeding device and liquid chromatograph device |
| WO2019021475A1 (en)* | 2017-07-28 | 2019-01-31 | 株式会社島津製作所 | Liquid feeding device |
| CN110799754A (en)* | 2017-07-28 | 2020-02-14 | 株式会社岛津制作所 | Liquid feeding device |
| CN110799754B (en)* | 2017-07-28 | 2020-12-29 | 株式会社岛津制作所 | Liquid feeding device |
| US11434897B2 (en) | 2017-07-28 | 2022-09-06 | Shimadzu Corporation | Liquid delivery device |
| CN114636661A (en)* | 2022-03-04 | 2022-06-17 | 青岛瑞斯凯尔生物科技有限公司 | A liquid circuit system for quantitative analysis of cells and its working method |
| CN114636661B (en)* | 2022-03-04 | 2024-08-20 | 青岛瑞斯凯尔生物科技有限公司 | Liquid path system for quantitative analysis of cells and working method thereof |
| Publication number | Publication date |
|---|---|
| JPH0754114B2 (en) | 1995-06-07 |
| Publication | Publication Date | Title |
|---|---|---|
| US4913624A (en) | Low pulsation displacement pump | |
| US7588423B2 (en) | Pump for liquid chromatograph | |
| US9410543B2 (en) | Pump for liquid chromatograph, and liquid chromatograph | |
| EP0309596B1 (en) | Pumping apparatus for delivering liquid at high pressure | |
| EP0883744B1 (en) | Pump | |
| AU603826B2 (en) | Liquid chromatograph | |
| US4752385A (en) | Liquid chromatograph | |
| JPS61178569A (en) | Control method of liquid feeding pump | |
| AU600309B2 (en) | Liquid chromatograph | |
| JPS61178582A (en) | Liquid feeding pump apparatus | |
| JPH0141220B2 (en) | ||
| JP4092831B2 (en) | Liquid feeding device | |
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| JPS61178571A (en) | Liquid feeding pump | |
| JP3540010B2 (en) | Drive control device for plunger reciprocating pump | |
| JPH0627837Y2 (en) | Liquid delivery pump device | |
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| CN217029197U (en) | Cam with angle of repose | |
| JPH0460456A (en) | Concentration gradient and/or flow rate gradient creation device | |
| JPH06159235A (en) | Reciprocating liquid delivery device | |
| JP2013119800A (en) | Plunger pump | |
| JPS6316873Y2 (en) | ||
| JPH10311824A (en) | Multiple fluid mixing pump device | |
| JPH05180160A (en) | Series type double plunger pump | |
| JPH0815245A (en) | Gradient controller for liquid chromatograph |
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |