EP2006543B1 - Flüssigkeitskreislaufvorrichtung - Google Patents

Flüssigkeitskreislaufvorrichtung Download PDF

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Publication number
EP2006543B1
EP2006543B1 EP07012107A EP07012107A EP2006543B1 EP 2006543 B1 EP2006543 B1 EP 2006543B1 EP 07012107 A EP07012107 A EP 07012107A EP 07012107 A EP07012107 A EP 07012107A EP 2006543 B1 EP2006543 B1 EP 2006543B1
Authority
EP
European Patent Office
Prior art keywords
membrane
drive means
fluid
vacuum pump
drive member
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.)
Active
Application number
EP07012107A
Other languages
English (en)
French (fr)
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EP2006543A1 (de
Inventor
Olivier Favre
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.)
Infomed SA
Original Assignee
Infomed SA
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Filing date
Publication date
Application filed by Infomed SA filed Critical Infomed SA
Priority to ES07012107T priority Critical patent/ES2378564T3/es
Priority to AT07012107T priority patent/ATE538310T1/de
Priority to EP07012107A priority patent/EP2006543B1/de
Priority to US12/141,116 priority patent/US8313314B2/en
Priority to JP2008186526A priority patent/JP5415033B2/ja
Publication of EP2006543A1 publication Critical patent/EP2006543A1/de
Application granted granted Critical
Publication of EP2006543B1 publication Critical patent/EP2006543B1/de
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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
    • F04B43/0009—Special features
    • F04B43/0081—Special features systems, control, safety measures
    • 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
    • F04B43/06—Pumps having fluid drive
    • F04B43/067—Pumps having fluid drive the fluid being actuated directly by a piston

Definitions

  • the present invention relates to a device for circulating fluids comprising at least one diaphragm pump for circulating a fluid in a direction and at a given flow rate by means of reciprocating movements of the membrane coordinated with the opening respectively. the closing of valves placed upstream and downstream of the rigid cavity in which the membrane moves.
  • the prior art describes numerous diaphragm pumps which can be classified in two categories: those comprising a rigid connection between the membrane and its drive system and those for which the diaphragm is displaced via a fluid .
  • the advantage of the latter solution is to allow membrane change with each use and thus avoid transmitting pollutants or contaminating the entrained fluid.
  • the elasticity of such a connection has negative effects on the accuracy of the fluid flow rate for each cycle of the pump and on its sensitivity to external parameters such as the pressure of the fluid entrained.
  • the prior art describes numerous systems using pumps comprising a membrane on which a gas, generally air, acts so as to create back and forth movements of this membrane which in turn, and combined with the valve movement, filled and empty a rigid chamber closed by this flexible membrane thus circulating the fluid present in the chamber.
  • These pumps as described in the prior art all include a membrane whose flexibility allows to vary the volume available for the fluid to circulate, one or more valve, and a rigid reservoir placed on the other side of the membrane and which receives the gas intended to actuate said membrane.
  • An object of the present invention is to provide a fluid circulation device comprising at least one diaphragm pump in which the displacement of the membrane, and therefore the volume of fluid displaced, can be known and determined accurately and without suffering any damage. significant influence of external parameters such as the fluid pressure to be circulated.
  • Another object of the present invention is to provide a fluid circulation device with several single diaphragm pumps, robust and reliable, usable in particular in the medical field and thus avoiding any contact between the fluid to be circulated and potentially contaminated parts
  • the present invention relates to a fluid circulation device comprising a circulation circuit of the fluid to be pumped having a rigid cavity closed by a flexible membrane which cooperates with a drive member driven by an engine in movements of va-and- comes, characterized in that the face of the drive member intended to cooperate with the membrane comprises an orifice, said orifice being is connected by a conduit to a vacuum pump capable of applying by suction the membrane against said face of the drive member so as to create a rigid connection between the drive member and said membrane which then exactly follows the reciprocating movements imposed by the drive member.
  • a fluid circulation device comprises at least one diaphragm pump, generally associated with an upstream valve and a downstream valve for defining the direction of the pumped fluid flow.
  • the present invention allows the realization of a rigid junction between the membrane and a drive member which fact that the movements of this membrane are known precisely which, in turn allows to know and fine-tune the flow rate or volume transported fluid to flow.
  • the essential characteristic of the fluid circulation device according to the invention lies in the fact that it comprises one or more fluid circulation circuits each comprising a rigid cavity whose wall is formed by a membrane, this membrane being held by depression against the surface of an actuator or sensor.
  • the movements of the membrane are accurate and allow a determination of the volume of pumped liquid or the pressure of the pumped liquid although the portion of the fluid circulation circuit comprising the membrane can be removable or replaceable.
  • the diaphragm pump comprises a rigid cavity in which the diaphragm moves under the action of a mechanical drive member actuated in its reciprocating movements by means of an electric motor, hydraulic, pneumatic, mechanical or any other type of motor.
  • This drive member is in contact by one face with the diaphragm and the latter is applied against this face of the drive member by a depression created between this diaphragm and this face of this drive member, a depression created. by an auxiliary vacuum pump.
  • the membrane very precisely follows the movements of the drive member, but this construction allows, when the circulation device is out of service, to separate the membrane of its drive member to change the circulation circuit fluid which in medical equipment in particular is a consumable element.
  • the bond thus created is devoid of elasticity and makes it possible, on the one hand, to avoid direct contact between the fluid to be circulated and potentially contaminated parts and, on the other hand, to know precisely, and in a manner that is little or not sensitive to different parameters such as pressure and temperature, the volume displaced per round-trip cycle of the membrane as will be seen below.
  • Such an embodiment of the diaphragm pump is advantageously usable in devices or devices comprising several diaphragm pumps and for example used in the medical, food, chemical or laboratory field.
  • a pump according to the present invention obviates the aforementioned drawbacks of the existing devices since the gas, or rather here the gas vacuum, is used solely to bond the membrane to a rigid and mechanical part, itself driven in any way but with a knowledge precise displacement it inflicts on the membrane. Due to the rigidity of the assembly, the transmission of the force as well as the displacement will not be sensitive to the usual parameters such as for example the pressure of the fluid to be circulated.
  • Such an embodiment is particularly advantageous when it is applicable to devices comprising several diaphragm pumps. In this case, it suffices to use a single vacuum pump to create and maintain contact between the different membranes and their respective drive systems.
  • the air vacuum can be achieved by a vacuum pump of any model that can be connected to one or more elements to be activated, the vacuum can be controlled and maintained, even in case of light leaks, throughout the process .
  • the device is for medical use, for example a dialysis machine, it usually also comprises several pressure sensors and this same principle can be applied to the sensors providing an additional advantage.
  • the presence of the vacuum pump makes it possible to achieve a low cost coupling between a membrane and the sensor by suction of air between the membrane and the sensor which will then directly suffer the force resulting from the pressure of the liquid present on the other side of the membrane.
  • a device comprises, as shown in figures 1 and 2 , a circulation circuit 1 of the fluid to be pumped comprising a section 1.1 that can be removable and having a rigid cavity 1.2, a wall of which is constituted by a membrane 1.3.
  • This circulation circuit 1 comprises in the illustrated example an upstream valve 1.4 and a downstream valve 1.5 respectively connected upstream and downstream of the rigid cavity 1.2 of this circulation circuit 1.
  • the membrane 1.3 of section 1.1 of the circulation circuit 1 cooperates with the front surface of a drive member 2 driven in a reciprocating motion by a motor 3.
  • the membrane 1.3 is pressed against the front face of the the drive member 2 by a vacuum created by a vacuum pump 4 connected by a conduit 5 to an orifice that comprises the end face of the drive member 2.
  • a vacuum pump 4 connected by a conduit 5 to an orifice that comprises the end face of the drive member 2.
  • the drive motor 3 is an electric motor whose rotor is connected by a connection rod and crank drive member 2.
  • the rotational movement of the motor 3 converted into a reciprocating movement of the drive member 2 drives the membrane 1.3 so as to alternately increase and reduce the volume of the rigid cavity 1.2 of the circulation circuit 1 of the fluid.
  • valves placed one upstream and the other downstream of the membrane 1.3 make it possible to ensure the direction of flow of the fluid thus pumped.
  • the valves are controlled by cams 6,7 represented on the figure 4 , placed on the axis of the motor 3. This preferred mode ensures low manufacturing costs and a high reliability of the system.
  • the figure 5 shows that an assembly also using the vacuum pump and a fluid circulation circuit 1 comprising a flexible membrane 1.3 allows replacing the motor 3 by a sensor 8 to measure the pressure present in the circuit for the values as well positive than negative thanks to the strength of the connection thus created by the vacuum between the membrane 1.3 and the sensor 8.
  • the figure 6 schematically represents a device according to the invention which comprises a plurality of circulation circuits 1 each of which comprises a membrane 1.3 connected as previously described to a drive member 2 or to a pressure sensor 8.
  • a single vacuum pump 4 allows via a vacuum distributor 10 to apply the membranes 1.3 of all the circulation circuits 1 on the drive member 2 respectively the corresponding sensor 8.
  • the distributor 10 can be passive and have only connectors permanently interconnected and so that all pumps and the sensors are at the same time empty. In this mode, which has the advantage of simplicity and low cost, if for some reason it is not possible to create the vacuum between one of the membranes and the drive member 2 or the sensor 8 which is associated all other links will be affected. In this case it is also not possible to establish which link is causing the problem.
  • An additional defect of a passive distributor is that the vacuum pump must be dimensioned proportionally to the number of circulation circuits 1 and therefore links to establish.
  • a vacuum distributor which comprises valves which can connect one after the other, or in groups, each circulation circuit 1 comprising the pumps and any sensors to the vacuum pump 4. These valves can either be Mechanical or be controlled by a control unit 9.
  • a valve position indicator is advantageously placed on each valve and connected to the control unit 9 so as to know its position.
  • a pressure sensor 11 will advantageously be placed between the vacuum pump and the distributor so as to detect any leaks which, if possible, will be corrected.
  • the pressure sensor and the vacuum pump will also advantageously be connected to the control unit, as well as a discharge valve enabling the connection, or the links, to be released between membranes and drive members by removing the empty of air.
  • control unit 9 may for example drive the valves in the following manner: it begins by closing all the valves except one and starts the vacuum pump. When a negative pressure determined to be sufficient is reached, the computing unit opens a second valve and so on until all the valves are open and the negative pressure is below a determined threshold. The calculation unit then stops the vacuum pump and continues to measure the pressure on the sensor 11. If this pressure increases indicating the presence of a leak, the calculation unit can then trigger again the vacuum pump and as needed actuate the valves in order to either solve the problem or provide a diagnostic.
  • the shape of the membrane 1.3 and that of the surface of the connecting means or drive member 2 which are in contact with said membrane correspond to to ensure a vacuum on the entire contact surface.
  • the respective shapes also make it possible to reduce the volume of air between the membrane and the surface before the vacuum is applied and make it possible to easily evacuate the air present.
  • the preferred embodiment satisfying these criteria is that one of the two surfaces is a cone, and the other surface is flat, the hole connected to the vacuum pump being in the center of the face of the means of link.
  • Another example would be that the two faces are flat, those of the connecting means being pierced with multiple small holes connected to the vacuum pump and ensuring the evacuation of air.
  • the figure 7 illustrates a membrane 1.3 in the form of a suction cup, having a free surface outside the circulation circuit, concave and conical.
  • the front face of the drive member 2 or the sensor 8 with which this membrane 1.3 cooperates is then flat.
  • the figure 8 illustrates a plane membrane 1.3 cooperating with a front face of a drive member 2 or a sensor 8 having a concave conical shape.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • External Artificial Organs (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Claims (9)

  1. Vorrichtung zur Zirkulation von Fluiden, die einen Kreislauf zur Zirkulation (1) des zu pumpenden Fluids umfasst, der einen starren Hohlraum (1.2) aufweist, der von einer flexiblen Membran (1.3) verschlossen wird, die mit einem Antriebsorgan (2) zusammenwirkt, das in hinund hergehenden Bewegungen von einem Motor (3) angetrieben wird, dadurch gekennzeichnet, dass die Seite des Antriebsorgans (2), die mit der Membran (1.3) zusammenwirken soll, eine Öffnung aufweist, wobei die Öffnung durch eine Leitung (5) mit einer Vakuumpumpe (4) verbunden ist, die die Membran (1.3) durch Ansaugen gegen die Seite des Antriebsorgans (2) bringen kann, so dass eine starre Verbindung zwischen dem Antriebsorgan (2) und der Membran (1.3) geschaffen wird, die dann genau den hin- und hergehenden Bewegungen folgt, die von dem Antriebsorgan (2) auferlegt werden.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die hin- und hergehenden Verlagerungen des Antriebsorgans (2) von einem Kreiskolbenmotor und einer trieblichen Verbindung erzeugt werden, die die Drehbewegung in eine lineare hin- und hergehende Bewegung umwandeln.
  3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass sie Ventile (1.4, 1.5) aufweist, die in dem Zirkulationskreislauf (1), dem starren Hohlraum (1.2) und der Membran (1.3) vor- und nachgelagert angeordnet sind, und dass diese Ventile von Nocken (6, 7) gesteuert werden, die von dem Motor (3) angetrieben werden.
  4. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Form der Membran (1.3) konisch-konkav ist und dass die entsprechende Fläche des Antriebsorgans (2) eben ist.
  5. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Form der Membran (1.3) eben ist und dass die entsprechende Fläche des Antriebsorgans (2) konisch-konkav ist.
  6. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sie mehrere Zirkulationskreisläufe (1) aufweist, deren Membranen (1.3) jeweils mit einem Antriebsorgan (2) zusammenwirken und dass eine einzige Vakuumpumpe alle Membranen (1.3) gegen deren jeweilige Antriebsorgane ansaugt.
  7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass die Vakuumpumpe (4) durch einen Vakuumverteiler (10) verzweigt ist, der wiederum mit durch eine Leitung (5) mit jedem Antriebsorgan (2) verbunden ist.
  8. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass sie außerdem eine Steuereinheit (9) aufweist, die den Vakuumverteiler (10) steuert, um nacheinander jedes Antriebsorgan (2) mit der Vakuumpumpe (4) zu verbinden.
  9. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sie außerdem mindestens einen Zirkulationskreislauf (1) aufweist, dessen Membran (1.3) mit einem Antriebsorgan (2) zusammenwirkt, das mit einem Druckaufnehmer verbunden ist.
EP07012107A 2007-06-21 2007-06-21 Flüssigkeitskreislaufvorrichtung Active EP2006543B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
ES07012107T ES2378564T3 (es) 2007-06-21 2007-06-21 Dispositivo de circulación de fluido
AT07012107T ATE538310T1 (de) 2007-06-21 2007-06-21 Flüssigkeitskreislaufvorrichtung
EP07012107A EP2006543B1 (de) 2007-06-21 2007-06-21 Flüssigkeitskreislaufvorrichtung
US12/141,116 US8313314B2 (en) 2007-06-21 2008-06-18 Fluid circulation device
JP2008186526A JP5415033B2 (ja) 2007-06-21 2008-06-20 流体循環装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07012107A EP2006543B1 (de) 2007-06-21 2007-06-21 Flüssigkeitskreislaufvorrichtung

Publications (2)

Publication Number Publication Date
EP2006543A1 EP2006543A1 (de) 2008-12-24
EP2006543B1 true EP2006543B1 (de) 2011-12-21

Family

ID=38669096

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07012107A Active EP2006543B1 (de) 2007-06-21 2007-06-21 Flüssigkeitskreislaufvorrichtung

Country Status (5)

Country Link
US (1) US8313314B2 (de)
EP (1) EP2006543B1 (de)
JP (1) JP5415033B2 (de)
AT (1) ATE538310T1 (de)
ES (1) ES2378564T3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3376217A1 (de) 2017-03-14 2018-09-19 Infomed SA Einheit zur detektion von gas, das in einer flüssigkeit enthalten ist

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3027848A (en) * 1959-07-13 1962-04-03 Gen Motors Corp Diaphragm pump

Family Cites Families (12)

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Publication number Priority date Publication date Assignee Title
US2229038A (en) * 1937-05-05 1941-01-21 Wallace & Tiernan Co Inc Liquid feeding apparatus
US2920573A (en) * 1956-12-22 1960-01-12 Schaurte Paul Diaphragm feed pump
US2998256A (en) * 1958-02-10 1961-08-29 Lipkins Morton Vacuum systems
FR1402976A (fr) * 1964-04-24 1965-06-18 Prolabo Societe Pour La Fabric Perfectionnements aux instruments de volumétrie
IL83259A (en) * 1987-07-20 1992-05-25 D F Lab Ltd Disposable cell and diaphragm pump for use of same
US5554011A (en) * 1994-10-27 1996-09-10 Symbiosis Corporation Medical fluid pump powered by a constant source of vacuum
US5647733A (en) * 1995-12-01 1997-07-15 Pulsafeeder Inc. Diaphragm metering pump having modular construction
US5958634A (en) 1997-10-30 1999-09-28 Eastman Kodak Company Display apparatus using light patternable conductive traces
US6503062B1 (en) * 2000-07-10 2003-01-07 Deka Products Limited Partnership Method for regulating fluid pump pressure
US7087036B2 (en) * 2002-05-24 2006-08-08 Baxter International Inc. Fail safe system for operating medical fluid valves
JP4103682B2 (ja) * 2003-05-27 2008-06-18 松下電工株式会社 圧電ダイヤフラム型ポンプ
GB2431439A (en) * 2005-10-20 2007-04-25 Ccl Concept & Developments Ltd Volumetric dosing apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3027848A (en) * 1959-07-13 1962-04-03 Gen Motors Corp Diaphragm pump

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3376217A1 (de) 2017-03-14 2018-09-19 Infomed SA Einheit zur detektion von gas, das in einer flüssigkeit enthalten ist

Also Published As

Publication number Publication date
ATE538310T1 (de) 2012-01-15
JP2009002350A (ja) 2009-01-08
EP2006543A1 (de) 2008-12-24
US8313314B2 (en) 2012-11-20
ES2378564T3 (es) 2012-04-13
JP5415033B2 (ja) 2014-02-12
US20090010777A1 (en) 2009-01-08

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