WO2007143992A1 - Pompe - Google Patents

Pompe Download PDF

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Publication number
WO2007143992A1
WO2007143992A1 PCT/DK2007/000281 DK2007000281W WO2007143992A1 WO 2007143992 A1 WO2007143992 A1 WO 2007143992A1 DK 2007000281 W DK2007000281 W DK 2007000281W WO 2007143992 A1 WO2007143992 A1 WO 2007143992A1
Authority
WO
WIPO (PCT)
Prior art keywords
conduit
pump according
membrane
fluid
displacement
Prior art date
Application number
PCT/DK2007/000281
Other languages
English (en)
Inventor
Peter Gravesen
René Bøgelund NYBERG
Original Assignee
Danfoss A/S
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 Danfoss A/S filed Critical Danfoss A/S
Publication of WO2007143992A1 publication Critical patent/WO2007143992A1/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
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/04—Pumps having electric drive
    • F04B43/043—Micropumps

Definitions

  • the invention relates to a membrane pump with an inlet, an outlet and a membrane which defines a displacement chamber with a variable volume.
  • the pump further comprises an upstream valve structure adapted to restrict a fluid flow from the displacement chamber to the inlet, and a downstream valve structure adapted to restrict a fluid flow from the outlet to the displacement chamber. More particularly, the invention relates to a mini or micro channel pump.
  • US 6,796,215 discloses a membrane pump with a membrane which delimits a conveying space.
  • a pump drive provides an oscillating movement of the membrane whereby a fluid is sucked from a suction side and delivered to a pressure side.
  • the disclosed pump has a relatively complex structure requiring extensive machining and accuracy during manufacturing. Furthermore, the disclosed pump is not suitable for a micro channel system.
  • US 6,572,566 discloses a pump for moving liquid through a channel by means of pressure and underpressure.
  • a micromachined peristaltic pump is disclosed in us 6,007,309. Again, the disclosed pump requires extensive machining and would typically not be suitable e.g. in connection with disposable "one time” use.
  • Another pump with a stretchable membrane is disclosed in US 6,948,918. Again, the disclosed pump is expensive and relatively complicated to produce. DESCRIPTION OF THE INVENTION
  • the invention provides a pump wherein the upstream valve structure, the downstream valve structure and the displacement actuation structure are separated from the fluid and wherein these structures are detachably attachable to an outer surface of a first component which first component forms the fluid conduit.
  • the pump according to the invention facilitates a simple and reliable design with reuse of certain parts and disposal of other parts.
  • Fluid conduit' is any kind of channel enabling a flow of a fluid, e.g. a liquid medium.
  • the inlet and outlet are any kind of openings into and out of the channel, respectively, and the displacement chamber has a volume which can be varied.
  • the downstream valve structure restricts flow of fluid from the outlet to the chamber.
  • the volume is decreased whereby the liquid is displaced out of the chamber and out through the outlet.
  • the upstream valve structure restricts a fluid flow from the chamber and out through the inlet.
  • the displacement chamber could be formed by an elastically deformable wall, and the deformation of the wall could be caused by any kind of displacement actuation structure capable of deforming the wall either by direct contact or by providing a pressure difference across the wall.
  • the upstream valve structure could be a passive structure which is operated by a pressure difference so that the conduit is essentially unaffected by the upstream valve structure when the pressure in the inlet is higher than the pressure in the displacement chamber, i.e. during the first pumping step.
  • the pressure in the chamber increases, and the increase activates the upstream valve structure which restricts flow backwardly towards the inlet.
  • restrict is meant that the flow resistance is increased or that flow is completely prevented.
  • the upstream valve structure could also be an active structure which is operated electrically or mechanically based on the movement of the displacement actuation structure or based on movement of the wall of the displacement chamber.
  • An active structure may comprise magnetically operated valves or electrically operated actuators which deform the conduit and thereby restricts fluid flow through the conduit.
  • the same applies with respect to the downstream valve structure which could be passive and leave the conduit essentially unaffected when the pressure in the outlet is lower than the pressure in the displacement chamber and to restrict the flow, when the volume of the displacement chamber increases during the filling of the chamber with fluid from the inlet and the pressure in the chamber thus decreases.
  • the downstream valve structure could also, in accordance with the upstream valve structure, be actively controlled based on volume changes of the displacement chamber.
  • the fluid conduit could be formed between a base and a membrane which is more flexible than the base.
  • more flexible is meant elastically deformable by use of less force than what would have been required to elastically deform the base, if the base is elastically deformable at all.
  • the base could e.g. be a relatively rigid plate e.g. of silicon, glass, plastic etc and the conduit could be formed as a groove or depression in an upper surface of the base.
  • the membrane is subsequently attached to the upper surface to cover the groove.
  • the membrane may form the outer surface of the first component to which the valve and displacement actuation structures are detachably attached.
  • the membrane may, however, also be covered at least partly by a top layer which is less flexible than the membrane.
  • the top layer may comprise an aperture pattern exposing a surface portion of the membrane towards the valve structures and towards the displacement actuation structure.
  • the top layer may further comprise attachment means, e.g. screw threaded holes etc. for attachment of the valve structures and the displacement actuation structure.
  • the membrane is sandwiched between the base and the top layers.
  • the base and top could be made from the same material and e.g. in essentially the same thickness.
  • the outer surface of the first component is an essentially planar surface.
  • the fluid is isolated in the conduit between the inlet and the outlet so that only the first component is in contact with the fluid in question.
  • the fluid conduit may preferably extend uninterruptedly between the inlet and the outlet.
  • the valve and pump actuation structures preferably operate directly on the outer surface of the membrane by deforming the membrane at various contact portions of the membrane.
  • a passive valve structure can be provided by a lever arm which is pivotally hinged at a hinge point.
  • the lever arm comprises a first contact portion at which the lever arm is pushed by the outer surface of the membrane and a second contact portion at which the lever arm pushes against the outer surface of the membrane.
  • the first and second contact portions of the lever arm are located on opposite sides of the hinge point so that, when the first portion is moved upwardly, away from the conduit, the second portion is moved downwardly towards and into the conduit thereby limiting fluid flow in the conduit.
  • the first and second contact portions are on the same side of the hinge point so that, when the first portion is moved upwardly, away from the conduit, the second portion is also moved upwardly out of the conduit thereby increasing a fluid flow in the conduit.
  • the ratio between the pressure which is applied by the membrane onto the lever arm and the corresponding pressure applied by the lever arm onto the membrane can be adjusted by adjustment of the length from the hinge point to each of the first and second contact points or by selecting different flexibilities for different portions of the membrane, i.e. at the corresponding two contact portions of the membrane, or by allowing different sized areas of the membrane to deflect inwardly and outwardly, respectively.
  • the last mentioned different sized areas can be achieved by the aforementioned top layer in which the aperture sizes at the two contact portions could be of different size.
  • the lever arm of the downstream valve structure may preferably be biased towards a closed position wherein the second portion is moved into the conduit when the first portion is not influenced by the membrane, and the lever arm of the upstream valve structure may preferably be biased towards an open position wherein the second portion is only moved into the conduit when the first portion is influenced by the membrane.
  • the displacement actuation structure may preferably be formed in one component with the valve structures, and this single component could be detachably attached to the first component e.g. by use of screws, rivets etc or by use of a strap of an elastically deformable material or similar means which bias the single component against the outer surface of the first component.
  • Fig. 1 illustrates a pump according to the invention in an "open state
  • Fig. 2 illustrates a pump according to the invention in a "closed state
  • FIG. 3 and 4 illustrate a downstream valve structure in further details
  • FIG. 5 and 6 illustrate an upstream valve structure in further details
  • the pump 1 comprises a first component 2 consisting of a base, a membrane, and a top layer (shown in further details in Fig. 3).
  • the pump is adapted for pumping a fluid in a flow direction indicated by the arrow 3 from an inlet 4 to an outlet 5.
  • the pump comprises a fluid conduit 6 extending from the inlet to the outlet. Between the inlet and outlet, the conduit forms a displacement chamber 7.
  • a displacement actuation structure 8 is adapted to affect volume change of the displacement chamber 7.
  • the pump is illustrated in a situation wherein the actuation structure is drawn backwardly to increase the volume of the chamber and thereby to cause a flow of a fluid from the inlet 4 to the chamber 7.
  • the pump comprises an upstream valve structure 9 which is adapted to restrict a fluid flow from the displacement chamber to the inlet 4 when the fluid is pumped out of the displacement chamber 7, c.f. Fig. 2.
  • the upstream valve structure is in an open state wherein fluid is allowed to flow from the inlet to the displacement chamber.
  • the pump further comprises a downstream valve structure 10 adapted to restrict a fluid flow from the outlet 5 to the displacement chamber 7 when the chamber 7 receives fluid from the inlet.
  • the upstream valve structure 9, the downstream valve structure 10 and the displacement actuation structure 8 are separated from the fluid. Since all of the structures operate on an outer surface of the membrane, all three structures may be detachably attached to the outer surface of the first component 2.
  • the displacement actuation structure 8 operates on the chamber 7 formed by an enlarged opening in the top layer, which opening exposes the membrane towards the displacement actuation structure.
  • the upstream valve structure 9 cooperates with the membrane through first and second enlarged openings 11 , 13 in the top layer
  • the downstream valve structure 10 cooperates with the membrane through first and second enlarged openings 12, 14 in the top layer.
  • Figs. 3 and 4 illustrate in further details the downstream portion of the pump with the downstream valve structure 10.
  • the valve structure comprises a cantilever 12 which is pivotally hinged at the hinge point 15 and comprises a portion 16 which is pushed upwardly by the membrane when the pressure increases and a portion 17 which in its normally closed state pushes against the membrane and thus restricts a fluid flow towards the outlet.
  • the cantilever is lifted by the relatively large surface area 12 whereby the portion 18 is lifted away from the membrane, and the flow resistance towards flow between the chamber 7 and the outlet 5 decreases.
  • the valve is biased towards the normally closed configuration by the spring 19.
  • the valve is controlled by a pressure difference between pressure in the conduit and ambient pressure.
  • Fig. 3 illustrates the 3 layer sandwich structure with a rigid base plate 20, a more flexible membrane 21 and a top layer 22 in which an aperture pattern exposes an upper surface of the membrane towards the displacement actuation structure 8 and towards the valve structures 9, 10.
  • Figs. 5 and 6 illustrate in further details the upstream portion of the pump in which the cantilever 23 is pivotally hinged at the hinge point 24.
  • One end 25 of the cantilever is pushed upwardly when the membrane deforms upwardly due to an increasing pressure in the conduit while the other end 26 is pressed downwardly onto the membrane and thereby restricts the flow of fluid from the chamber 7 towards the inlet 4 when the volume of the chamber is decreased.

Landscapes

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

Abstract

L'invention propose une pompe à membrane pour un système de minicanaux ou de microcanaux, par exemple. La pompe est équipée d'un conduit de fluide passant par une entrée, traversant une chambre de déplacement à volume variable jusqu'à une sortie. Le conduit est formé dans un premier composant ; une structure d'actionnement de déplacement pouvant provoquer un changement de volume de la chambre de déplacement et des structures de soupapes amont et aval pouvant forcer le fluide dans une direction sont séparées du fluide et conçues pour être fixées de manière amovible à une surface externe d'un premier composant qui forme le conduit de fluide. L'invention permet donc de faciliter la fabrication d'une pompe simple et fiable dont certains composants sont réutilisables mais dont on peut jeter les composants contaminé par le fluide pompé.
PCT/DK2007/000281 2006-06-12 2007-06-12 Pompe WO2007143992A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200600789 2006-06-12
DKPA200600789 2006-06-12

Publications (1)

Publication Number Publication Date
WO2007143992A1 true WO2007143992A1 (fr) 2007-12-21

Family

ID=38477027

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2007/000281 WO2007143992A1 (fr) 2006-06-12 2007-06-12 Pompe

Country Status (1)

Country Link
WO (1) WO2007143992A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4468222A (en) * 1976-05-24 1984-08-28 Valleylab Intravenous liquid pumping system and method
EP0288717A1 (fr) * 1984-02-08 1988-11-02 Omni-Flow, Inc. Système d'infusion sensible à la pression
US5205819A (en) * 1989-05-11 1993-04-27 Bespak Plc Pump apparatus for biomedical use
US5609572A (en) * 1992-11-23 1997-03-11 Lang; Volker Cassette infusion system
WO2002004046A2 (fr) * 2000-07-07 2002-01-17 Fluidsense Corporation Cassette
WO2005094919A1 (fr) * 2004-03-30 2005-10-13 Novo Nordisk A/S Systeme actuateur comprenant un moyen de detection

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4468222A (en) * 1976-05-24 1984-08-28 Valleylab Intravenous liquid pumping system and method
EP0288717A1 (fr) * 1984-02-08 1988-11-02 Omni-Flow, Inc. Système d'infusion sensible à la pression
US5205819A (en) * 1989-05-11 1993-04-27 Bespak Plc Pump apparatus for biomedical use
US5609572A (en) * 1992-11-23 1997-03-11 Lang; Volker Cassette infusion system
WO2002004046A2 (fr) * 2000-07-07 2002-01-17 Fluidsense Corporation Cassette
WO2005094919A1 (fr) * 2004-03-30 2005-10-13 Novo Nordisk A/S Systeme actuateur comprenant un moyen de detection

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