EP0231194B1 - Pompe - Google Patents

Pompe Download PDF

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Publication number
EP0231194B1
EP0231194B1 EP19850906096 EP85906096A EP0231194B1 EP 0231194 B1 EP0231194 B1 EP 0231194B1 EP 19850906096 EP19850906096 EP 19850906096 EP 85906096 A EP85906096 A EP 85906096A EP 0231194 B1 EP0231194 B1 EP 0231194B1
Authority
EP
European Patent Office
Prior art keywords
pump
elevations
displacing means
pumping element
flexible
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.)
Expired
Application number
EP19850906096
Other languages
German (de)
English (en)
Other versions
EP0231194A1 (fr
Inventor
Eric Bruce
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 AT85906096T priority Critical patent/ATE40187T1/de
Publication of EP0231194A1 publication Critical patent/EP0231194A1/fr
Application granted granted Critical
Publication of EP0231194B1 publication Critical patent/EP0231194B1/fr
Expired 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
    • F04B43/1238—Machines, pumps, or pumping installations having flexible working members having peristaltic action using only one roller as the squeezing element, the roller 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
    • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
    • F04B43/123—Machines, pumps, or pumping installations having flexible working members having peristaltic action using an excenter as the squeezing element

Definitions

  • the invention relates to a peristaltic pump of the type stated in the prior-art part of claim 1, i.e. a displacement pump comprising a pump housing enclosing a space delimited by side walls and a mantle wall; a pumping element influenced by peristaltic displacements and arranged in said space with an inlet at one end and an outlet at the other and with the outer periphery of said element contacting the mantle wall of said space at least along a sector thereof, at least the inwardly facing part of that sector of said element which maintains said contact consisting of a flexible material which permits said element to be compressed under the influence of a force directed radially outwards against the inside of said element; an annular displacing means in said space inside said flexible pumping element, the circumference of said displacing means being smaller than that of the curve along which it rolls; and means of propulsion to impart on said annular displacing means a rolling movement in said space, said displacing means concurrently being pressed against the
  • a peristaltic pump of this kind is in particular disclosed in SE-A-357801.
  • the invention also relates to pumping systems where the peristaltic pump is used to pump a working medium, which drives one or several further displacement pumps, also being parts of said system.
  • This concept also includes improvements of the second displacement pump, said improvements by themselves being usable in other contexts than in combination with the peristaltic displacement pump.
  • Peristaltic pumps are known in a large number of embodiments.
  • the Swiss Patent No. 482 922 and the British Patent No. 1 539 823 constitute examples of known designs.
  • These and other peristaltic pump designs have in common that the flexible pumping element are being worked upon in a manner causing strong wear by that element which for each turn is pressed against the inside of the pumping element along the entire length thereof within the section in question.
  • the displacement is accomplished by a combination of pressure, directed radially outwards, and rolling, but includes also a non-negligible amount of sliding against the flexible pumping element. All these factors contribute to the intense wear on the flexible pumping element, which is normally a piece of tubing, thus considerably shortening the working life of the flexible pumping element.
  • pumps of the kind comprising a first chamber provided with check valves at the inlet and outlet permitting the pumped medium to flow through the first chamber, a second chamber, a flexible impermeable wall separating the first chamber from the second, and at least one fitting at the second chamber through which to admit and discharge a working medium during working and return strokes, respectively, thus making said flexible wall during the working stroke to expand into the first chamber there to displace a corresponding amount of the pumped medium which is discharged through the outlet valve, and during the return stroke to make the flexible wall withdraw, thus sucking in a corresponding amount of pumped medium through the inlet valve into the first chamber, the least volume of the first chamber being set by a perforated rigid wall inside the flexible wall.
  • a first object of the invention is to provide a peristaltic pump the flexible pumping element of which does not suffer the same degree of wear that conventional comparable pumps do, and therefore has a considerably longer working life.
  • Another object of the invention is to provide a pumping system comprising both a pump for a working medium in which is generated a pulsating fluid pressure by said pump and a number of displacement pumps.
  • a third object of the invention is to provide an improved displacement pump of a non-peristaltic type, which is well suited to function jointly with preferably one or several peristaltic pumps.
  • a peristaltic pump is characterized in that the annular displacing means is provided with outwardly directed elevations in the form of ridges or suchlike, spaced along the periphery of the annular displacing means, the distance between adjacent elevations being several times the arc length of each individual elevation, said elevations being intended to be pressed against the flexible pumping element so that said element is locally collapsed in the area of the said elevations, and that the relation between the circumference of the annular displacing means and that of the curve along which it rolls is such that the said elevations are displaced for a certain distance per turn, the point of engagement against the flexible pumping element thus being the same only after a number of turns, which distributes the wear caused by the elevations on the flexible pumping element over a larger area and reduces attrition, this in turn increasing the working life of the pumping element.
  • Typical of an application of this peristaltic pump is that the pump is being used as a working pump to create a pulsating fluid pressure in a second displacement pump of the kind also described above.
  • a characteristic of an improvement of this second displacement pump is that the flexible wall of this pump is pre-tensioned.
  • a characteristic of the function of the peristaltic displacement pump when used in conjunction with a second displacement pump, there to create a pulsating fluid pressure is that its inlet opening is closed, a vacuum thus forming in the inlet chamber during the working stroke, said chamber being refilled with working medium during the return stroke and said vacuum cooperating with the pre-tensioned element of said second displacement pump.
  • a pump housing is generally indicated by reference numeral 1.
  • This housing is in the shape of a box, with side walls 2 on each side of a pump housing body 3, said body having a cylindrical bore 4, forming a pumping space with a cylindrical mantle wall 5.
  • Two bores 6 and 7 extend through the body 3 from the outside, tangentially into the space 4.
  • a flexible pumping element in the form of a tube 8 extends through the bores 6 and 7 and arcuately through the space 4, in which space said tube runs adjacent the mantle wall 5 for half the circumference thereof.
  • the space 4 also holds a displacing means in the form of a planetary ring 9.
  • the diameter of this ring is considerably less than that of the mantle wall 5 and also less than that of the inside 10 facing the interior of the space 4 of that part of the tube 8 which runs adjacent the mantle wall 5.
  • the planetary ring 9 is arranged to be rolled around the pumping space 4 by means of a central pumping axle 11.
  • the axle 11 drives a roller 12, which is pressed against the inside of the planetary ring 9 in a manner well known in the art.
  • the planetary ring 9 is provided with distinct, large elevations 13, the pitch, form, profile, and height of these elevations being such that they, as the planetary ring rotates, accomplish a suitable local compression of the tube 8 in the area where said tube runs adjacent the mantle wall 5.
  • the elevations 13 may be attached to the planetary ring 9 in a stationary manner or flexibly or elsewise and may also, by a suitable choice of material, be made to interact with the tubing material so as to achieve the least possible wear and power consumption.
  • the pitch and the pressure are set so that there is never less than one elevation and never more than two elevations in full engagement with the tube at any one time, i.e. collapsing it fully and preventing the return flow of the pumped medium.
  • the compression in the regions of the elevations 13 will be directed radially, and at the area of contact only a slight turning will occur, the tangential forces at the same time being very small, which in turn reduces wear and resistance to rolling.
  • the relation of the circumference of the planetary ring 9 to that of the curve along which it rolls inside the pumping space 4 is such that the elevations 13 will be displaced slightly for each turn, the points of interaction of the elevations with the tube 8 being the same only after a number of turns.
  • the wear of the elevations against the tubing is distributed over a larger area, which diminishes total wear and increases the working life of the tube.
  • the lessened wear allows for a larger pump capacity as the rate of revolution may be increased and the pump size may be decreased.
  • the peristaltic pump described may function as a normal pump for transportation, such as a suction pump.
  • the suction side 14 is connected to the volume of fluid which is to be transported, -and the discharge side 15 is connected to a transport conduit.
  • the pump may also be used as a source of pulsations for a second displacement pump, providing a pulsating flow of a working medium for said second pump.
  • the suction side 14 is closed at one end, schematically indicated by the plug 16.
  • a vacuum is created in the tube section 8' on the suction side 14, said vacuum being filled as the planetary ring 9 is at the top side of the pumping space 4.
  • the peristaltic pump may serve for example a displacement pump 17 of the kind illustrated schematically in Fig. 3.
  • the pump 17 comprises an outer chamber 18 with rigid walls 19, the material of the walls being for example sheet metal or plastic.
  • the outer chamber 18 is provided with a feed conduit 20 and a discharge conduit 21 with checkvalves 22 and 23, respectively.
  • an inner chamber 24 formed by a rigid cylindrical body with a perforated mantle and closed ends.
  • a connecting conduit to the inner chamber 24 is indicated by numeral 25.
  • This connecting conduit 25 is connected to the pressure side 15 of the above described peristaltic pump.
  • Fig. 3a On the outside of the rigid, perforated body 26, Fig. 3a, one or several rubber sleeves 27 have been pushed. As is evident from the figures, the sleeves 27 must be expanded considerably to fit the perforated body 26. Thus, they are pre-tensioned as they assume their starting position the body 26.
  • Fig. 4 illustrates the use of a peristaltic pump 1' to serve a second displacement pump 17 of the type just described.
  • the pressure side of the pump 1' is connected to the inner chamber 24 of the pump 17.
  • the working medium is pumped into the inner chamber 24 of the pump 17, where it expands the flexible sleeve 27 further and displaces working medium out of the outer chamber 18 through the discharge conduit 21 via check valve 23.
  • the flexible sleeve 27 springs back against the perforated body 26 and concurrently, working medium is again sucked into the suction side 14 of the peristaltic pump 1'. New working medium is sucked into the outer chamber 18 of the pump 17 , through the feeding conduit 20 via the check valve 22.
  • the pre-tensioned sleeve 27 hence cooperates with the vacuum at the suction side of the peristaltic pump 1'. By pretensioning the rubber, it becomes possible to work within the ideal working interval of the rubber.
  • the return force of the sleeve 27 may be set by the choice of material thickness or initial diameter so as to achieve the proper pre-tensioning according to the conditions at hand, or by applying several sleeves 27, one outside the other, as is symbolically indicated in Fig. 3b, where three sleeves 27 are'shown, intended to be put outside each other outside the perforated body 26.
  • the displacement pump 17 may for example be put to use in a drill hole to pump water, while the peristaltic pump 1 or 1' is placed adjacent the hole or at a distance therefrom.
  • the pump may be driven manually, by a motor, by wind, or elsewise.
  • working medium is supplied from the pump 1 to the inner chamber of the pump 17, so that the elastic sleeve on the outside of the perforated body 26 expands, water is pressed in bursts via the discharge opening 21 out of the drill hole.
  • the iterated application of working medium to the pump 17 causes a pulsating movement and a pulsating discharge of water out of the drill hole.
  • a drill hole 30 in which there are arranged four serially connected displacement pumps 17 at different depths. Each one of these may be served by a peristaltic pump of the kind described with reference to Figs. 1, 2, and 4, said peristaltic pumps then being arranged to function with a suitable phase displacement in relation to each other. It is also possible to use a peristaltic pump of the kind illustrated in Fig. 5.
  • This pump comprises four tubular elements 32 spaced along the mantle of the pumping space 4. Each tube 32 is provided with a closed suction side 33 and a pressure side 34 attached to one of the pumps 17, to pump working medium into the inner chamber 24 of this second displacement pump, Fig. 3.
  • the four tubes 32 are acted upon by one singular planetary ring 9, of the design described with reference to Fig. 1. As this ring rotates in the pumping space 4, it will consecutively compress the four tubes 32, the four displacement pumps 17 in the drill hole 30 consecutively being activated to pump the water stepwise out of the drill hole.

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

Abstract

Une pompe péristaltique est pourvue d'un organe annulaire de déplacement (9) dans l'espace de pompage à l'intérieur d'un élément souple de pompage (8), et d'organes de propulsion (11, 12) pour imprimer à l'organe de déplacement un mouvement de roulement dans l'espace de pompage tandis que ledit organe de déplacement est simultanément comprimé contre l'intérieur de l'élément souple de pompage, des parties consécutives de l'élément de pompage étant ainsi comprimées de manière péristaltique. Selon l'invention, ledit organe annulaire de déplacement (9) est muni de protubérances (13) dirigées vers l'extérieur sous forme de crêtes ou similaire et espacées à la périphérie de l'organe de déplacement, la distance entre des protubérances adjacentes étant égale à plusieurs fois la longueur d'arc de protubérances individuelles, l'élément de pompage étant ainsi comprimé localement dans la région des protubérances. D'autre part, le rapport de la circonférence de l'organe de déplacement à celle de la courbe au long de laquelle il roule est tel que les protubérances sont déplacées d'une certaine distance à chaque tour, les points de contact étant identiques à une certaine fréquence.

Claims (3)

1. Pompe du type péristaltique, c'est à dire pompe à déplacement (1, 1', 31) comprenant un carter de pompe entourant un espace de pompage (4) délimité par des parois latérales et par une paroi d'enveloppe (5), un élément de pompage (8) influencé par les déplacements péristaltiques et disposé dans ledit espace (4) avec une entrée (14) à une extrémité et une sortie (15) à l'autre extrémité, et la périphérie externe dudit élément étant en contact avec ladite paroi d'enveloppe dudit espace au moins le long d'un segment de celle-ci, au moins la partie tournée vers l'intérieur dudit segment dudit élément qui maintient ledit contact consistant en un matériau flexible permettant audit élément d'être comprimé sous l'influence d'une pression appliquée radialement à l'extérieur contre l'intérieur dudit élément, un moyen de déplacement annulaire (9) dans ledit espace à l'intérieur dudit élément de pompage flexible, la circonférence dudit moyen de déplacement étant plus petite que celle de la courbe le long de laquelle il roule, et un moyen de propulsion (11, 12) pour communiquer audit moyen de déplacement annulaire un mouvement de roulement dans ledit espace, ledit moyen de déplacement annulaire étant concurremment pressé contre l'intérieur dudit segment dudit élément de pompage flexible, causant ainsi une compression péristaltique des parties successives dudit segment dudit élément de pompage flexible entre ledit moyen de déplacement annualaire et ladite paroi d'enveloppe (5) dudit espace, caractérisée en ce que ledit moyen de déplacement annulaire (9) est muni d'éléments en hauteur (13) dirigés vers l'extérieur sous forme d'arêtes ou analogues, espacés le long de la périphérie dudit moyen de déplacement annulaire, la distance entre des éléments en hauteur adjacents étant plusieurs fois la longueur d'arc de chaque élément en hauteur individuel, lesdits éléments en hauteur étant destinés à être pressés contre l'élément de pompage flexible de sorte que ledit élément est déformé localement au voisinage desdits éléments en hauteur, et que la relation de la circonférence du moyen de déplacement annulaire à celle de la courbe le long de laquelle il roule est telle que lesdits éléments en hauteur sont déplacés sur une certaine distance par tour, le point d'engagement contre l'élément de pompage flexible étant ainsi régulièrement le même après un certain nombre de tours, ce qui répartit l'usure causée par les éléments en hauteur sur l'élément de pompage flexible sur une large surface et ce qui réduit l'attrition, augmentant ainsi la durée de vie utile de l'élément de pompage.
2. Pompe selon la revendication 1, caractérisée en ce que c'est une pompe motrice dans un système de pompage comprenant au moins une deuxième pompe à déplacement (17), la pompe mentionnée en premier lieu étant destinée à créer une pression par impulsions dans un fluide moteur pour ladite seconde pompe à déplacement, le côté d'aspiration de la pompe mentionnée en premier lieu étant scellé, un vide partiel étant ainsi créé de l'aspiration de ladite pompe mentionnée en premier lieu au cours de la course motrice de celle-ci.
3. Pompe selon la revendication 1, caractérisée en ce que deux desdits éléments en hauteur du moyen de déplacement ferment complètement de facon conjoints l'élément de pompage.
EP19850906096 1984-11-21 1985-11-20 Pompe Expired EP0231194B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85906096T ATE40187T1 (de) 1984-11-21 1985-11-20 Pumpe.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8405849A SE8405849D0 (sv) 1984-11-21 1984-11-21 Anordning vid en for manuell drift anpassad pumpanleggning
SE8405849 1984-11-21

Publications (2)

Publication Number Publication Date
EP0231194A1 EP0231194A1 (fr) 1987-08-12
EP0231194B1 true EP0231194B1 (fr) 1989-01-18

Family

ID=20357836

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850906096 Expired EP0231194B1 (fr) 1984-11-21 1985-11-20 Pompe

Country Status (5)

Country Link
EP (1) EP0231194B1 (fr)
AU (1) AU5194286A (fr)
DE (1) DE3567702D1 (fr)
SE (1) SE8405849D0 (fr)
WO (1) WO1986003255A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH682586A5 (de) * 1990-11-30 1993-10-15 Mathias Reichmuth Pumpe.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE357801B (fr) * 1971-10-22 1973-07-09 Allen Longford & Ass Ltd
FR2439313A1 (fr) * 1978-10-20 1980-05-16 Pompes Essa Mico Dispositif de pompage pour puits profonds

Also Published As

Publication number Publication date
SE8405849D0 (sv) 1984-11-21
AU5194286A (en) 1986-06-18
EP0231194A1 (fr) 1987-08-12
DE3567702D1 (en) 1989-02-23
WO1986003255A1 (fr) 1986-06-05

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