US3758239A - Controlled peristaltic pump - Google Patents

Controlled peristaltic pump Download PDF

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Publication number
US3758239A
US3758239A US00210371A US3758239DA US3758239A US 3758239 A US3758239 A US 3758239A US 00210371 A US00210371 A US 00210371A US 3758239D A US3758239D A US 3758239DA US 3758239 A US3758239 A US 3758239A
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United States
Prior art keywords
support member
hose
pump
occlusion
support
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Expired - Lifetime
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US00210371A
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English (en)
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J Hrdina
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Czech Academy of Sciences CAS
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Czech Academy of Sciences CAS
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    • 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
    • F04B43/1223—Machines, pumps, or pumping installations having flexible working members having peristaltic action the actuating elements, e.g. rollers, moving in a straight line during squeezing

Definitions

  • ABSTRACT In peristaltic pumps, using a number of mobile occluding organs which press a resilient hose against a support and which cause the advance of a medium within this hose, an additional support is provided from the limit point of occlusion up to the last contact point with the hose. The distance of the support from the track of the occluding organs being in inverse proportion to the required speed of advance of the medium in this hose.
  • Peristaltic pumps are particularly useful in laboratories, as they enable a relatively simple mechanism to simultaneously generate a stream of a medium in a large number of resilient hoses situated side by side. Similar pumps are very suitable for operation with a segmented stream, that is with a stream of a medium subdivided by pistons (for instance gas pistons) into individual segments. Peristaltic pumps have however a number of drawbacks which are at present considered irremovable. Primarily they have a certain lack of uniformity of the stream delivery within the so called critical range of the pump.
  • the critical range being defined as the area where the occluding organ in its compression track starts to withdraw from the hose and to release it, whereby the occlusion ceases and the hose starts to regain, by its elasticity, its normal shape. This condition generates irregularities of the delivered stream which reduce the otherwise high accuracy of peristaltic pumps.
  • the occluding organ moves within a part of itstrack from the marginal point of occlusion up to the last point of contactwith the hose of the pump opposite to a surface having a longitudinal profile and the distances between individual points from the contact point of the occluding organ change, being reversibly proportional to the speed of advance of the stream of the medium required by the program in the individual points of said track.
  • the invention covers also an arrangement for regulating and programming the discharge and the suction of these pumps whereby to a fundamental supporting plate, the active surface of which has a constant distance from the track of the contact points of the occluding organs, an auxiliary support is joined, the individual points of its active surface having a distance from the contact points of the occluding organ which change being reversibly proportional to the speed of advance of the stream of the medium, required by the program in the individual points of said track.
  • the invention provides a peristaltic pump, where the irregularities of the stream of the medium within the changes to another value after the passage of the medium, either stepwise or continuously.
  • FIG. 1 is a schematic view of a peristaltic pump of known design
  • FIG. 2 a schematic view of another known design of a peristaltic pump
  • FIG. 3 is a schematic longitudinal sectional view of the active part of a peristaltic pump adjusted according to this invention.
  • FIG. 4 is a partial longitudinal sectional view of an alternative arrangement of a peristaltic pump according to this invention.
  • FIG. 5 is a partial sectional view of a further modification of the peristaltic pump according to this invention.
  • FIG. 6 is a diagram schematically showing the occluding organ of a conventional pump at full occlusion of the hose and in the course of its subsequent release.
  • FIG. 1 shows one of the commonly used arrangements of peristaltic pumps where a number of occlusion rollers 1, 2, 3, 4 are provided either directly on arms 5 (one arm is only partly indicated in the drawing) critical range are eliminated and which in additon allows the adjustment of the stream at the critical area according to a predetermined program of control.
  • the function of programming is to provide for the uniform advance of the medium, but it is also possible to achieve other conditions.
  • the arcuate shape of the support 11 insures that the rollers, within a part of their track remain in contact with the hose 10 which is thereby compressed so that below the individual rollers a complete occlusion, that is a complete closing of the hose is caused.
  • the support 11 is urged against the rollers byan element 12 generating pressure.
  • the place of occlusion advancescontinuously along the hose at an angular speed corresponding to the angular speed of the shaft jacent branch of the roller chain, whereafter in part B it recedes from the rollers.
  • FIG. 6 shows the operation of the pump schematically.
  • each occlusion organ 1,2,3, travels along a curved path 15 a portion of which constitutes the compression track wherein the roller compresses one portion of the wall of the hose 10 against the opposing wall portion.
  • the depth of compression of roller e.g. 41
  • mainteneance of the occlusion reserve C the hose is segmented by the roller forming a portion 16 behind it and a portion 17 ahead of it and by which the media is separated. This occlusion reserve is required to insure that a tight seal is made between sections 16 and 17.
  • the compression of the hose reduces the volume of the hose, thus increasing the pressure of the medium in the hose between itself and the next preceeding roller.
  • the moving occlusion organs thus push the medium conveying a stream of medium to the discharge end along the path D.
  • rollers when driven along their path at a constant speed, act to impart an irregularity to the flow of medium in the conveyed stream within the pump range which is detected atthe discharge end of the hose. This irregularity is caused by the action of the roller when it releases from the hose during the course of each individual compression period (a period being defined as the distance between successive rollers).
  • the bar is located between the compression track and the discharge.
  • the clamp 18 is adjustable with respect to a fixed support 19 and is resiliently pressed against the support 19 to cause selected deformation of the hose 10 up to a complete occlusion.
  • the bar is particularly used for a stream of gas such as air segmented by pistons rather than rollers. If the bar is closed, the air or gas compressed between the closed bar and the next approaching occlusion roller is held until the moment when the bar is lifted andreleases the passage of the medium through the hose 10.
  • FIG. 3 shows one of the simplest arrangements which can be made according to this invention.
  • Rollers 20, 21, 22, 23 of a peristaltic pump are arranged at mutual distances L and move along a straight path 24 which passes over a hose 25 suitably supported so that the rollers and hose engage in a track of corresponding shape.
  • the hose 25 is subsequently deformed from the place of first contact of the individual roller with the hose'which is indicated in the-drawing asbeing below the roller 20 which has just touched the upper wall of the hose. This deformation corresponds to the consecutive change along the direction of movement of the distance between the path 24 and the support.
  • the support consists of a base supporting plate 26, the upper active surface 27 of which is parallel with the path 24 and at the discharge end an auxiliary support 28 having rection opposite thereto, that is toward the suction.
  • the distance d decreases inversely proportional to the speed of the stream of the medium required by the program at each of the individual points of the critical range K.
  • the interval of re-' lease K of one roller is made to extend through the entire length of the discharge stroke L of next succeeding roller. Therefore uniform discharge is obtained.
  • the upper active surface 29 of the auxiliary, support 28 it is desirable to shape the upper active surface 29 of the auxiliary, support 28 so that the speed of the stream is slowed to correspond for instance to the time of supply of the bubble piston (e.g., bar) at the segmentation point prior to discharge. This achieves a uniform speed of the medium behind the segmentation point. Any other shape to control speed according to the requirements of any program is of course equally possible.
  • FIG. 3 where an auxiliary support 30 is provided at the suction end, the upper surface of which is shaped so as the meet requirements according to the stipulated program. If no programming of suction is needed, the auxiliary support 30 may be omitted, so that the pump will have only a single auxiliary support at the discharge end. The converse holds true if only suction is programmed.
  • FIG. 4 shows an alternative arrangement where the auxiliary support 28 is adjustable.
  • the auxiliary support 28 rests on set screws 31 which are screwed in into the body of a supporting plate 26 and joined at its upper active surface 29 to the corner edge 32 of the supporting plate 26.
  • the supporting plate 28 is pressed against the screws 31 by the force of the spring 33 suspended between a bolt 34 on the auxiliary support 28 and a bolt 35 on the supporting plate 26.
  • the spring 33 is preferably situated in an inclined position with respect to the active surfaces of the supporting plate 26 and of the auxiliary support 28 so that it is biased toward both the auxiliary support 28 and the supporting plate 26 as well as to the set screws 31. In this way the corner edge 32 need not be covered.
  • a double arrow F indicates the length of the compression track, which each roller has to traverse in order to eliminate the occlusion reserve C (see FIG. 6) that is from the point where the roller must begin to lift from compressive position up to the place, where the occlusion ceases. From this point on, which is the limit point M of occlusion, upt to point E, where the roller just leaves the hose 25, the complete release of the hose is effected.
  • This distance, indicated by the double arrow K is the aforementioned critical range of operation.
  • the length of the distance R for the same pump must be different for different diameters of hoses, since each diameter of hose will create its-own variable suction. The uniform discharge effect of the moving rollers will therefore be influenced by the chosen hose as well as the distance K.
  • auxiliary support 28 and thus also of the length of the criticalrange K is rather important for modern peristaltic pumps which may be designed to pump through a larger number of hoses (for instance up to 28 hoses), the diameters of each of which may be different from theother. It was impossible in the known devices to achieve a proportionality of the discharge in each of the different hoses. For instance in the design shown in FIG.” 2, there is no possibility of adjustment and therefore no possibility to program, that is, control the combined effect of discharge and suction within the critical range. This form of control is enabled only by this invention. Thus one of the main disadvantages of prior peristaltic pumps which had been up to now considered irremovable has in fact been removed.
  • hoses range from an internal diameter 0.127 mm up to a diameter 2.80 mm or from an external diameter of 1.56 up to a diameter 4.2 mm.
  • suction within the critical range K can be empirically determined with acceptable accuracy. Actually delivered volumes created by deformations of hoses having different parameters are registered. Based on the thus determined curves, it is easy to further determine the time course of changes of distances d that is the angle and length of the surface 9 from the path 24 within the critical range K (see FIG. 3 and 4). By establishing these determination of changes of discharge achieved by the sum of the fundamental discharge effect of the peristaltic pump in combination with the suction effect within this critical range can be made so that they would correspond to the given requirements of the pump program.
  • FIG. 5 shows another modification of this invention.
  • the auxiliary support 28 is in this case joined to the base supporting plate 26 so that at the place of contact of these two elements there is a sudden drop or step indicated by the reference mark 36.
  • the roller for instance roller 23 advances very quickly from a position, where it still fully occludes the hose 25 with the required reserve, to a closely adjacent point, where the occlusion immediately stops and the hose opens.
  • the length of the track portion F as indicated in FIG. 4, which the roller must traverse in order to eliminate the occlusion reserve C (FIG. 6) is practically reduced to zero.
  • this step 36 can be achieved in the arrangement according to FIG. 4 by asuitable adjustment'of the left set screw 31 so that the auxiliary support 28 can not only be deviated around the edge 32, but may be also shifted perpendiculary to the edge 32.
  • the auxiliary support 28 can be provided either for each hose alone or as a common support for several hoses. Of course individual adjusting elements can be provided for an entire group of individual hoses either of equal or different profiles.
  • Controlled peristaltic pump comprising at least one flexible hose having a suction end and a discharge end for suction and discharge, respectively, of a liquid medium, supporting means having an active surface for supporting said hose, compressing means disposed opposite said supporting means, movable along a predetermined path and adapted to progressively compress said hose against said supporting means and to generate a peristaltic pumping effect, said supporting means ineluding at least a first support member substantially parallel to the pathof said compressing'means and a second support member disposed next to said first member, said second support member being adjustable with respect to the predetermined path to selectively vary the distance from said compressing means thereby controlling the action of said compressing means and the discharge of said liquid medium.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
US00210371A 1970-12-23 1971-12-21 Controlled peristaltic pump Expired - Lifetime US3758239A (en)

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Application Number Priority Date Filing Date Title
CS8746A CS162875B1 (enrdf_load_stackoverflow) 1970-12-23 1970-12-23

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US3758239A true US3758239A (en) 1973-09-11

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CS (1) CS162875B1 (enrdf_load_stackoverflow)
DE (1) DE2162942A1 (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3826593A (en) * 1972-05-12 1974-07-30 Casimir W Von Pulsefree peristaltic pump and method of operating same
US3837433A (en) * 1973-03-05 1974-09-24 Roper Corp Lubricating system for chain saw
DE2454763A1 (de) * 1973-11-23 1975-05-28 Bjoerklund Knut Bertil Verfahren und vorrichtung zum messen
DE2454899A1 (de) * 1973-11-23 1975-08-21 Bjoerklund Knut Bertil Verfahren und vorrichtung zum messen eines fluessigkeitsteiles
US4735553A (en) * 1985-04-30 1988-04-05 Lucien Vidal Straight peristaltic pump for conveying concrete or the like
US5370510A (en) * 1992-06-12 1994-12-06 Bee Chemical Company Liquid metering system
US6906985B2 (en) 2001-01-25 2005-06-14 Dphi Acquisitions, Inc. Calibration of tracking error signal gain in a tracking servo system
GB2425523A (en) * 2005-04-28 2006-11-01 Senake Atureliya Depositing doses of a fluid
US20070258829A1 (en) * 2006-04-21 2007-11-08 Bredel Hose Pumps B.V. Peristaltic pump
US20110011811A1 (en) * 2009-07-17 2011-01-20 Gordon H. King Apparatus and method for the treatment of liquid/solid mixtures
US20110060284A1 (en) * 2009-09-10 2011-03-10 Tyco Healthcare Group Lp Compact peristaltic medical pump
US8937854B2 (en) 2001-01-25 2015-01-20 Optical Devices, Llc Servo processor receiving photodetector signals

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3940730A1 (de) * 1989-12-09 1991-06-13 Sartorius Gmbh Peristaltische schlauchpumpe zum foerdern eines fluids
FR2737261B1 (fr) * 1995-07-27 1997-10-10 Jean Francois Ognier Pompe peristaltique

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB467288A (en) * 1936-02-14 1937-06-15 Cyril George Mancha Bennett Improvements in and relating to pumps
FR1119170A (fr) * 1953-06-25 1956-06-15 Dunlop Rubber Co Perfectionnements aux pompes à liquides
US3101674A (en) * 1960-12-20 1963-08-27 Technicon Instr Multiple-tube pump
US3137241A (en) * 1962-01-25 1964-06-16 Technicon Instr Proportioning pump
US3597124A (en) * 1969-09-04 1971-08-03 Cenco Medical Health Supply Co Perastaltic pump
US3628891A (en) * 1970-09-14 1971-12-21 Technicon Corp Method for the minimization of the effects of pulsations in intermittent pumping systems

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB467288A (en) * 1936-02-14 1937-06-15 Cyril George Mancha Bennett Improvements in and relating to pumps
FR1119170A (fr) * 1953-06-25 1956-06-15 Dunlop Rubber Co Perfectionnements aux pompes à liquides
US3101674A (en) * 1960-12-20 1963-08-27 Technicon Instr Multiple-tube pump
US3137241A (en) * 1962-01-25 1964-06-16 Technicon Instr Proportioning pump
US3597124A (en) * 1969-09-04 1971-08-03 Cenco Medical Health Supply Co Perastaltic pump
US3628891A (en) * 1970-09-14 1971-12-21 Technicon Corp Method for the minimization of the effects of pulsations in intermittent pumping systems

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3826593A (en) * 1972-05-12 1974-07-30 Casimir W Von Pulsefree peristaltic pump and method of operating same
US3837433A (en) * 1973-03-05 1974-09-24 Roper Corp Lubricating system for chain saw
DE2454763A1 (de) * 1973-11-23 1975-05-28 Bjoerklund Knut Bertil Verfahren und vorrichtung zum messen
DE2454899A1 (de) * 1973-11-23 1975-08-21 Bjoerklund Knut Bertil Verfahren und vorrichtung zum messen eines fluessigkeitsteiles
US4735553A (en) * 1985-04-30 1988-04-05 Lucien Vidal Straight peristaltic pump for conveying concrete or the like
US5370510A (en) * 1992-06-12 1994-12-06 Bee Chemical Company Liquid metering system
US8937854B2 (en) 2001-01-25 2015-01-20 Optical Devices, Llc Servo processor receiving photodetector signals
US6906985B2 (en) 2001-01-25 2005-06-14 Dphi Acquisitions, Inc. Calibration of tracking error signal gain in a tracking servo system
US9514777B2 (en) 2001-01-25 2016-12-06 Optical Devices, Llc Servo processor receiving photodetector signals
US9245569B1 (en) 2001-01-25 2016-01-26 Optical Devices, Llc Servo processor receiving photodetector signals
US9105281B2 (en) 2001-01-25 2015-08-11 Optical Devices, Llc Servo processor receiving photodetector signals
GB2425523A (en) * 2005-04-28 2006-11-01 Senake Atureliya Depositing doses of a fluid
US20070258829A1 (en) * 2006-04-21 2007-11-08 Bredel Hose Pumps B.V. Peristaltic pump
US8157547B2 (en) * 2006-04-21 2012-04-17 Bredel Hose Pumps B.V. Peristaltic pump with flow control
US8074809B2 (en) * 2009-07-17 2011-12-13 Gordon H. King Apparatus and method for the treatment of liquid/solid mixtures
US20110011811A1 (en) * 2009-07-17 2011-01-20 Gordon H. King Apparatus and method for the treatment of liquid/solid mixtures
US8241018B2 (en) 2009-09-10 2012-08-14 Tyco Healthcare Group Lp Compact peristaltic medical pump
US8882481B2 (en) 2009-09-10 2014-11-11 Covidien Lp Compact peristaltic medical pump
US20110060284A1 (en) * 2009-09-10 2011-03-10 Tyco Healthcare Group Lp Compact peristaltic medical pump

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Publication number Publication date
DE2162942A1 (de) 1972-07-13
CS162875B1 (enrdf_load_stackoverflow) 1975-07-15

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