WO1996036812A1 - Procede, pompe peristaltique et tuyau flexible pour l'apport d'un fluide - Google Patents

Procede, pompe peristaltique et tuyau flexible pour l'apport d'un fluide Download PDF

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Publication number
WO1996036812A1
WO1996036812A1 PCT/EP1996/002071 EP9602071W WO9636812A1 WO 1996036812 A1 WO1996036812 A1 WO 1996036812A1 EP 9602071 W EP9602071 W EP 9602071W WO 9636812 A1 WO9636812 A1 WO 9636812A1
Authority
WO
WIPO (PCT)
Prior art keywords
hose
clamping
pump
counterpart
section
Prior art date
Application number
PCT/EP1996/002071
Other languages
German (de)
English (en)
Inventor
Volker Von Hertel
Original Assignee
Volker Von Hertel
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 Volker Von Hertel filed Critical Volker Von Hertel
Priority to AU58971/96A priority Critical patent/AU5897196A/en
Publication of WO1996036812A1 publication Critical patent/WO1996036812A1/fr

Links

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
    • F04B43/0009—Special features
    • F04B43/0054—Special features particularities of the flexible members
    • F04B43/0072—Special features particularities of the flexible members of tubular flexible members
    • 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
    • F04B43/08—Machines, pumps, or pumping installations having flexible working members having tubular flexible members
    • F04B43/082—Machines, pumps, or pumping installations having flexible working members having tubular flexible members the tubular flexible member being pressed against a wall by a number of elements, each having an alternating movement in a direction perpendicular to the axes of the tubular member and each having its own driving mechanism

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • a pumping process consists of successive pumping periods. In each pump period, after delimitation, one. Output volume of the outlet opened, an output amount is conveyed by compressing the pump section, then after closing the outlet and opening the inlet, the pump section is erected for receiving new fluids by the radial restoring forces, and finally the output volume is delimited by closing the inlet.
  • Peristaltic pump kept constant by precise regulation of the drive of the pump mechanism. The reduction in the output volume of the pump section during a pumping operation is not taken into account.
  • the invention has for its object to provide a method by which this reduction in the delivery rate is avoided and thus a constant delivery rate is achieved with a constant drive of the pump mechanism.
  • the invention also relates to a hose pump.
  • the flexible connection of a clamping counterpart of the pump to the pump section reduces the expansion of the pump section according to the invention during the conveyance.
  • This flexible connection can be formed by parts of the hose touching the clamping counterpart or by a weakened hose section located between the clamping member and the pump section.
  • the invention also relates to a hose.
  • the ring according to claim 15 ensures that its resilient surface z. B. characterized in that provided on the clamping counterpart tips or cutting-shaped parts penetrate them axially relative to the clamping counterpart and thereby leads to a reduction in hose expansion.
  • FIG. 6 shows a section along the section line VI - VI in FIG. 5
  • FIG. 1 shows above a commercially available hose 10, on which two rings are glued as clamping members 11.
  • Two clamping counterparts 12 and 12 ' are provided in the hose pump, which is only partially shown below.
  • the clamping counterpart 12 ' is displaceably mounted parallel to the longitudinal axis 13 of the hose in the hose pump, which is indicated in the drawing by the double arrow 14 ' .
  • a stepping motor 14 engages the clamping counterpart 12 ' , by means of which it can be stretched to different lengths between the clamping counterparts 12 and 12 ' . After insertion of the hose 10 into the clamping counterparts 12 and 12 ' , the hose section in between is stretched by the stepper motor 14.
  • a pump mechanism in the pump in a known manner, which has an inlet valve 15, an outlet valve 16, and a pump element 17, which are designed as pressure elements.
  • a drive shaft (not shown in the drawing) with cams is provided, by means of which the pressure elements are moved in the following manner within a pumping period.
  • the pump period begins with that, as shown in Fig. 1, the inlet valve 15 and the outlet valve 16 are in their closed position, in which they compress the hose against a pressure plate 18 in the hose pump.
  • an outlet volume 20 is limited in the pump section 19 of the hose lying between the two valves 15 and 16. Then the outlet valve 16 is opened and the hose with the
  • FIG. 2 differs from the embodiment of FIG. 1 in that both clamping counterparts 112 are fixedly arranged in the peristaltic pump at a distance from one another which is greater than the distance between the clamping members 1 1 1 and that between the two Clamping elements 111 located hose part is divided into the pump section 21 provided for the action of the pump member 11 and a hose section 22 with a thinned hose wall.
  • the hose section 22 is stretched more than the pump section 21.
  • the hose material in the hose section 22 tires more quickly than in the pump section 21.
  • the pump housing In the known peristaltic pumps, the pump housing, not shown in the drawing, has a cover which must be opened when the hose is replaced. This cover is coupled to the pressure plate 118 of the pump mechanism so that when it is opened, the pressure plate lifts off the hose 110 and thereby releases it from the pump mechanism.
  • the clamping counterpart 112 is mounted axially displaceably in the exemplary embodiment according to FIG. 2, as in the exemplary embodiment according to FIG. 1, then it can be coupled to the cover in such a way that when the cover is closed the clamping counterpart 112 is axially unstretched from the hose for expanding the pump section 21 holding starting position is moved to the clamping position.
  • This coupling of the cover with the clamping counterpart 1 12 has the further advantage that if the cover is opened for a break during occasional interruptions of a pumping process, the clamping counterpart 112 moves back into its starting position, so that the hose is no longer stretched.
  • the two tasks at the top of the peristaltic pump cover on the one hand stretching the hose and on the other hand releasing it from the pump mechanism, can be assigned to two parts, namely a special flap on the one hand and, as is known, the cover on the other
  • the embodiment of Fig. 3 corresponds essentially to the embodiment of Fig. 2.
  • the only difference is that the fatigue of the hose material to The weakening of the axial tensile forces in the pump section is not achieved by a hose section with a thinned hose wall, as in the exemplary embodiment according to FIG. 2, but by circumferential grooves 23.
  • the bottom of these grooves also forms thinned narrow circumferential hose wall strips which, when the hose 210 is clamped in the clamping counterparts 212, are stretched more parallel to the hose axis 213 than the other hose parts.
  • the constancy of the delivery rate can be achieved in the same way as in the exemplary embodiment according to FIG. 2.
  • An advantage of the exemplary embodiment according to FIG. 3 compared to the exemplary embodiment according to FIG. 2 is that the length of the hose part between the two clamping members 212 can be made significantly shorter than in the exemplary embodiment according to FIG. 2 and in extreme cases the length of the pump section 219 can restrict.
  • the fatigue of the hose material required to carry out the method according to the invention can also be controlled by a wall thickness and / or axially changing wall thickness and / or changing material properties of the hose 110, 210.
  • tips 325 are formed here by edges of strip-shaped clamping counterparts 412, which are attached to a soft cylindrical or conical surface 427 of a fixedly connected to the hose 410, serve as a clamping member 41 1 serving ring and thereby the flexible connection between the clamping member 41 1 and the clamping counterparts 412 is formed, the flexibility of the surface 427 by the cone angle of this
  • connection can be regulated within wide limits.
  • the ring forming the clamping member 411 has a stop 432 which limits the reduction in elongation.
  • the clamping member 51 1 consists, similarly to the previous exemplary embodiment, of a ring which, however, is connected to the hose 510 only by cutting edges 525 engaging radially in the hose, so that the hose 510 is relative to its clamping member 511 through the Tractive force is displaceable. Instead of cutting 525
  • the adjoining surfaces of the ring and the hose can be connected for a friction which gives the desired flexibility. This flexible connection between the hose and the clamping member also enables compensation for the reduction in volume of the initial volume during a pumping process.
  • FIG. 7 the clamping member 51 1 consists, similarly to the previous exemplary embodiment, of a ring which, however, is connected to the hose 510 only by cutting edges 525 engaging radially in the hose, so that the hose 510 is relative to its clamping member 511 through the Tractive force is displaceable.
  • the adjoining surfaces of the ring and the hose can be connected for a friction which gives the desired flexibility. This flexible connection between the hose and
  • the clamping member 611 consists of a ring 629 and a rib 628 encircling the hose 610, which is connected to the hose 610 with its radially outer edge 630, with the ring 629 and with its radially inner edge 631. If the ring 629 lies against the clamping counterpart 612 of the pump in such a way that it cannot follow the train in the direction of the arrow 626 in the hose 610, then the rib 628 forms an axially flexible member which is caused by the tension in the hose 610 in the direction of the arrow 626 is axially tensioned against its elastic restoring forces.
  • the invention can be applied to all peristaltic pumps, such as. B. in finger peristaltic pumps, in which many fingers act as pressure elements in a wave-shaped movement, and hose roller pumps, in which the fluid is conveyed by wholly or partially compressing the hose.
  • Another advantage of the invention is that the hose is kept under an axial tension, so that each newly inserted hose always has the same rectilinear shape in the area of the pump mechanism and has the same initial tension, which leads to deviations from a desired delivery rate largely avoided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Abstract

L'invention concerne un procédé, une pompe péristaltique et un tuyau flexible permettant l'obtention d'un débit constant d'apport de fluide. A cet effet, la réduction du débit due à la fatigue du matériau constituant le tuyau flexible est éliminée par un agrandissement adapté du volume de départ (20) qui est initialement réduit en raison de l'allongement du tuyau flexible (10).
PCT/EP1996/002071 1995-05-15 1996-05-14 Procede, pompe peristaltique et tuyau flexible pour l'apport d'un fluide WO1996036812A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU58971/96A AU5897196A (en) 1995-05-15 1996-05-14 Process, peristaltic pump and hose for delivering a fluid

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19517243 1995-05-15
DE19517243.4 1995-05-15

Publications (1)

Publication Number Publication Date
WO1996036812A1 true WO1996036812A1 (fr) 1996-11-21

Family

ID=7761628

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/002071 WO1996036812A1 (fr) 1995-05-15 1996-05-14 Procede, pompe peristaltique et tuyau flexible pour l'apport d'un fluide

Country Status (2)

Country Link
AU (1) AU5897196A (fr)
WO (1) WO1996036812A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0388596A1 (fr) * 1989-03-23 1990-09-26 B. Braun Melsungen AG Tube de pompage pour une pompe péristaltique
EP0409001A1 (fr) * 1989-07-15 1991-01-23 Fresenius AG Dispositif d'injection de liquides
EP0459113A1 (fr) * 1990-05-04 1991-12-04 Joseph Bertoncini Pompe péristaltique et méthode de réglage du débit ajustable
WO1994021918A1 (fr) * 1993-03-22 1994-09-29 Precision Dispensing Systems Limited Pompe a tuyau souple

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0388596A1 (fr) * 1989-03-23 1990-09-26 B. Braun Melsungen AG Tube de pompage pour une pompe péristaltique
EP0409001A1 (fr) * 1989-07-15 1991-01-23 Fresenius AG Dispositif d'injection de liquides
EP0459113A1 (fr) * 1990-05-04 1991-12-04 Joseph Bertoncini Pompe péristaltique et méthode de réglage du débit ajustable
WO1994021918A1 (fr) * 1993-03-22 1994-09-29 Precision Dispensing Systems Limited Pompe a tuyau souple

Also Published As

Publication number Publication date
AU5897196A (en) 1996-11-29

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