EP2085615A1 - Pompe péristaltique pour fournir des produits fluides et procédés de contrôle de cette pompe - Google Patents

Pompe péristaltique pour fournir des produits fluides et procédés de contrôle de cette pompe Download PDF

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Publication number
EP2085615A1
EP2085615A1 EP08101184A EP08101184A EP2085615A1 EP 2085615 A1 EP2085615 A1 EP 2085615A1 EP 08101184 A EP08101184 A EP 08101184A EP 08101184 A EP08101184 A EP 08101184A EP 2085615 A1 EP2085615 A1 EP 2085615A1
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EP
European Patent Office
Prior art keywords
dispensed
stroke
steps
calculation
volume
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08101184A
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German (de)
English (en)
Inventor
Massimo Dinelli
Alfonso Faenza
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP08101184A priority Critical patent/EP2085615A1/fr
Publication of EP2085615A1 publication Critical patent/EP2085615A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
    • F04B43/1253—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/0009—Special features
    • F04B43/0081—Special features systems, control, safety measures

Definitions

  • the present invention relates to a peristaltic pump for supplying fluid products, and a method for controlling said pump.
  • the invention has been developed with particular, although not exclusive, reference to a pump adapted to be used within machines supplying dyes for the production of paints, varnishes, inks and the like.
  • Rotary peristaltic pumps are known and are able to supply predetermined volumes of liquid, semi-liquid, fluid and pasty products. These pumps generally comprise a rotor to which one or a plurality of rollers are attached, which, when they rotate, compress a tube and then release it causing the fluid to move forward within the tube.
  • Known peristaltic pumps may be actuated by variable-speed electric motors, servo-motors, or step-by-step motors and the quantity of product supplied is conventionally calculated as a predetermined volume for each rotation of the rotor.
  • known peristaltic pumps have some drawbacks; it is difficult, for instance, to obtain precise and reproducible fluid quantity supplies if the quantity of fluid to be supplied comprises or corresponds to fractions of the predetermined volume per rotation of the rotor.
  • the present invention relates to a peristaltic pump and an accurate method for controlling the pump having the features set out in the accompanying claims.
  • the peristaltic pump of the present invention includes a rotor member 10 comprising a plurality of arms 12, preferably, but not limited to, three arms, each of which is connected to pressure means, for instance a roller 20.
  • a duct, for instance a tube 30, is disposed about the rotor and comprises an inlet zone 32 and an outlet zone 34 for the fluid to be supplied.
  • the tube 30 is normally made from resilient material, preferably silicone, PVC or other polymers which enable a resilient deformation of the tube and a high level of chemical compatibility with solvents, acids and varnishes.
  • the rollers 20 rotate, pressing on predetermined portions of the tube, causing its compression and successive release, thus causing the fluid to move forward in the tube from the inlet zone 32 to the outlet zone 34.
  • the rotor is generally connected to actuator means, preferably to an electric motor, more preferably a step-by-step electric motor which enables the angular displacement and speed of rotation of the rotor to be highly accurate, without using speed sensors.
  • the pump further comprises control means such as, for instance, a microprocessor and means for storing data, both used to supplement the control method of the present invention.
  • the peristaltic pump supplies, for each revolution of the rotor 10, a predetermined quantity X of fluid.
  • a number Y of rotations of the step-by-step motor are needed to complete a revolution of the rotor 10, with the result that, for each rotation of the step-by-step motor, a fraction of the overall quantity X is supplied.
  • the supply curve of a peristaltic pump is, however, a highly non-linear curve as the peristaltic pump is by its nature a "pulsing" pump, as a result of which the flow rate is not constant for the single revolution.
  • the method of the present invention therefore comprises a first stage of calibration of the pump during which the supply curve of the pump is reconstructed through successive checks on the volume of fluid supplied following a predetermined number of steps of the motor. More particularly, once an initial position is set, the motor is actuated for a predetermined number of steps and the corresponding quantity of product supplied is measured.
  • the overall quantity of fluid supplied by the peristaltic pump for each revolution of the rotor is equal to 2 ml.
  • Experimental tests conducted by the applicant have shown that the transition between a quantity of fluid supplied and the following quantity of fluid supplied is too high with this division and, as a result of the non-linear nature of the supply curve, is insufficiently accurate. For greater accuracy, it is advisable to increase the divisions to 1/8 (1600 steps) and more preferably to 1/16 (3200 steps).
  • the calibration stage comprises the calibration of a predetermined number of steps, preferably approximately 500, more preferably between 100 and 300 steps, and even more preferably between 200 and 250 steps distributed homogeneously along the whole curve.
  • a predetermined number of steps preferably approximately 500, more preferably between 100 and 300 steps, and even more preferably between 200 and 250 steps distributed homogeneously along the whole curve.
  • Each predetermined number of steps (X i ) corresponds to a respective volume of fluid supplied (V i ).
  • the calibration curve constructed from the calibration of the above-mentioned steps of the step-by-step motor, comprises a minimum number of steps X min , different from zero, and corresponding to the minimum volume V min that can be dispensed from the peristaltic pump on the basis of its mechanical characteristics.
  • the curve then ends at a predetermined number of steps X stroke which corresponds to a complete revolution of the rotor 10 and, therefore, to the maximum volume V stroke that can be supplied with a complete rotation of the rotor 10.
  • the curve comprises an inflection in its central portion corresponding to the passage of the roller 20 onto the tube 30.
  • the above-mentioned calibration of the steps is repeated at least three times.
  • the method of the present invention thus comprises a stage of interpolation of the points obtained during the calibration stage in order more accurately to determine the path of the curve. Given the non-linear nature of the curve, the use of a process of linear interpolation does not make it possible to obtain the desired results.
  • the method of the present invention uses a process of interpolation with higher-degree polynomials. Inflections are not obtained when interpolating with a polynomial of second degree, and in the points immediately preceding and following the flat zone of the curve, cusp points are created between successive interpolation intervals. Interpolating with a polynomial of fourth degree provides two inflections which do not mirror the path of the calibration curve.
  • the group of constants obtained, a 1 , b 1 , c 1 , d 1 , is used to interpolate the interval x 1 - x 4 at unit or greater intervals.
  • the stage of interpolation continues by interpolating a following group of four points which also includes the final point of the preceding group, for instance the interval x 4 - x 7 , ensuring that the first derivative at the first point is equal to the first derivative obtained with the group of constants of the preceding interval.
  • the interpolation stage continues in a recurrent manner until the whole of the calibration curve is obtained, as shown in Fig. 3 .
  • the new volume to be supplied V'' is calculated by means of the interpolated curve using the above-described stages.
  • the interpolated curve is not sufficient to calculate the exact number of rotations of the motor.
  • the method of the present invention therefore includes a stage of repositioning of the interpolated curve which returns V dispensed and X dispensed to the start of the axes and reconstructs the curve up to V stroke and X stroke .
  • the point X dispensed + X min becomes the new X min and all the points of the new X min up to X stroke are moved. The remaining points are moved to the upper end of the curve.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
EP08101184A 2008-01-31 2008-01-31 Pompe péristaltique pour fournir des produits fluides et procédés de contrôle de cette pompe Withdrawn EP2085615A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08101184A EP2085615A1 (fr) 2008-01-31 2008-01-31 Pompe péristaltique pour fournir des produits fluides et procédés de contrôle de cette pompe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08101184A EP2085615A1 (fr) 2008-01-31 2008-01-31 Pompe péristaltique pour fournir des produits fluides et procédés de contrôle de cette pompe

Publications (1)

Publication Number Publication Date
EP2085615A1 true EP2085615A1 (fr) 2009-08-05

Family

ID=39529767

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08101184A Withdrawn EP2085615A1 (fr) 2008-01-31 2008-01-31 Pompe péristaltique pour fournir des produits fluides et procédés de contrôle de cette pompe

Country Status (1)

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EP (1) EP2085615A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1326373A (en) * 1970-04-14 1973-08-08 Ivac Corp Fluid flow control apparatus
US4830218A (en) * 1987-01-27 1989-05-16 Fluid Management Systems Flow compensated pump
WO1991010934A1 (fr) 1990-01-11 1991-07-25 Baxter International Inc. Procede et dispositif de contrôle pour pompe peristaltique
US5733257A (en) 1993-10-11 1998-03-31 Gambro Ab Method for calibrating a pump segment used in a peristaltic pump and a medical machine adapted for carrying out the method
US20050180856A1 (en) * 2004-01-14 2005-08-18 Bach David T. Drive technology for peristaltic and rotary pumps
US20070059184A1 (en) 2005-09-15 2007-03-15 Bach David T Flow optical analysis for peristaltic and other rotary pumps

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1326373A (en) * 1970-04-14 1973-08-08 Ivac Corp Fluid flow control apparatus
US4830218A (en) * 1987-01-27 1989-05-16 Fluid Management Systems Flow compensated pump
WO1991010934A1 (fr) 1990-01-11 1991-07-25 Baxter International Inc. Procede et dispositif de contrôle pour pompe peristaltique
US5733257A (en) 1993-10-11 1998-03-31 Gambro Ab Method for calibrating a pump segment used in a peristaltic pump and a medical machine adapted for carrying out the method
US20050180856A1 (en) * 2004-01-14 2005-08-18 Bach David T. Drive technology for peristaltic and rotary pumps
US20070059184A1 (en) 2005-09-15 2007-03-15 Bach David T Flow optical analysis for peristaltic and other rotary pumps

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