Apparatus and method for controlling reciprocating pump

Patent metadata

Field	Value
Publication number	US-10746170-B2
Application number	US-201313893100-A
Country	US
Kind code	B2
Filing date	May 13, 2013
Priority date	May 15, 2012
Publication date	Aug 18, 2020
Grant date	Aug 18, 2020

Abstract

A preparative separation-purification system has controlling apparatus, which has a pump housing for pumping liquid. The apparatus also has a moving component for reciprocating in the pump housing so as to draw a liquid into the pump housing and discharge the liquid from the pump housing and a driving source for reciprocating the moving component. A setting unit is provided for setting a target liquid supply amount or a target amount which corresponds thereto. A unit amount memory unit is provided for storing a discharge amount of the reciprocating pump per a reciprocal movement of the moving component or a unit amount which is a value corresponding to the discharge amount. A computation unit is provided for computing the smallest multiple number of the unit amount which is equal to or larger than the target amount; and a motor controller for controlling the driving source.

First claim

The invention claimed is:

1. A preparative separation-purification system comprising:
a solution container;
at least one trap column;
a reciprocating pump having a pump housing;
a moving component for reciprocating in the pump housing so as to draw a liquid into the pump housing and discharge the liquid from the pump housing, wherein the moving component starts moving from any position which varies within its range of motion;
a driving source for reciprocating the moving component; and
a controlling apparatus including:
a setting section configured to set a target liquid supply amount;
a unit amount memory section configured to store a discharge amount of the reciprocating pump per a reciprocal movement of the moving component;
a computation section configured to compute a smallest multiple number of the discharge amount per the reciprocal movement of the moving component where the smallest multiple number of the discharge amount is obtained by rounding up figures after a decimal point of a ratio of the target liquid supply amount over the discharge amount; and
a motor controller configured to control the driving source so that the moving component stops at a same position at which the moving component starts moving by making the moving component reciprocate a same number of times as the smallest multiple number of the discharge amount wherein said same position is any position which varies within the moving component's range of motion.

2. The system according to claim 1 , further comprising a home position return section configured to return the moving component to a predetermined position every time the reciprocating pump is activated.

3. The system according to claim 1 , wherein the setting section is configured to further set a target liquid supply time which corresponds to the target liquid supply amount; wherein the unit amount memory section is further configured to store a unit driving time which corresponds to the discharge amount; wherein the computation section is further configured to compute a smallest multiple number of the unit driving time that is obtained by rounding up figures after a decimal point of a ratio of the target liquid supply time over the unit driving time; and wherein the motor controller configured to further control the driving source so as to reciprocate the moving component a same number of times as the smallest multiple number of the unit driving time.

4. The system according to claim 1 , wherein a cleaning liquid held in the trap column is replaced with a liquid supply amount equal to or larger than the target liquid supply amount every time the moving component is reciprocated the same number of times as the smallest multiple number of the discharge amount.

5. A controlling method for a preparative separation-purification system, comprising:
providing a solution container; at least one trap column; a pump housing; a moving component for reciprocating in the pump housing so as to draw a liquid into the pump housing and discharge the liquid from the pump housing, wherein the moving component starts moving from any position which varies within its range of motion; a driving source for reciprocating the moving component; and a controlling apparatus;
setting a target liquid supply amount;
computing, based on a discharge amount of the pump housing per a reciprocal movement of the moving component, a smallest multiple number of the discharge amount per the reciprocal movement of the moving component where the smallest multiple number of the discharge amount is obtained by rounding up figures after a decimal point of a ratio of the target liquid supply amount over the discharge amount; and
controlling the driving source so that the moving component stops at a same position at which the moving component starts moving by making the moving component reciprocate a same number of times as the smallest multiple number of the discharge amount, wherein said same position is any position which varies within the moving component's range of motion.

6. The method according to claim 5 , wherein further setting a target liquid supply time which corresponds to the target liquid supply amount; wherein further storing a unit driving time which corresponds to the discharge amount; and wherein further computing a smallest multiple number of the unit driving time that is obtained by rounding up figures after a decimal point of a ratio of the target liquid supply time over the unit driving time; and controlling the driving source so as to reciprocate the moving component a same number of times as the smallest multiple number of the unit driving time.

7. The method according to claim 5 , wherein a cleaning liquid held in the trap column is replaced with a liquid supply amount equal to or larger than the target liquid supply amount every time the moving component is reciprocated the same number of times as the smallest multiple number of the discharge amount.

8. A preparative separation-purification system comprising:
a solution container;
at least one trap column;
a reciprocating pump having a pump housing;
a moving component for reciprocating in the pump housing so as to draw a liquid into the pump housing and discharge the liquid from the pump housing, wherein the moving component starts moving from any position which varies within its range of motion;
a driving source for reciprocating the moving component; and
a controlling apparatus including:
a setting section configured to set a target liquid supply amount or a target liquid supply time which corresponds thereto;
a unit amount memory section configured to store (i) a unit discharge amount of the reciprocating pump per a reciprocal movement of the moving component and/or (ii) a unit driving time which corresponds to the unit discharge amount;
a computation section configured to compute a smallest multiple number (i) where the smallest multiple number is obtained by rounding up figures after a decimal point of a ratio of the target liquid supply amount over the unit discharge amount or (ii) where the smallest multiple number is obtained by rounding up figures after a decimal point of a ratio of the target liquid supply time over the unit driving time; and
a motor controller configured to control the driving source so that the moving component stops at a same position at which the moving component starts moving by making the moving component reciprocate a same number of times as the smallest multiple number, wherein said same position is any position which varies within the moving component's range of motion.

9. The system according to claim 8 , further comprising a home position return section configured to return the moving component to a predetermined position every time the reciprocating pump is activated.

10. The system according to claim 8 , wherein a cleaning liquid held in the trap column is replaced with a liquid supply amount equal to or larger than the target liquid supply amount every time the moving component is reciprocated the same number of times as the smallest multiple number.

Assignees

• Shimadzu Corp
• Shimadzu Corp

Inventors

• Yamazaki Tomoyuki

Classifications

• F04B49/065 Primary

  and making use of computers · CPC title

• F04B49/02 Primary

  Stopping, starting, unloading or idling control · CPC title

• F04B2205/09

  Flow through the pump · CPC title

• F04B2201/02071

  Total number of pumping strokes · CPC title

• F04B13/00

  Pumps specially modified to deliver fixed or variable measured quantities · CPC title