EP0582625B2 - Procede et dispositif pour le dosage controle d'au moins un composant coulant - Google Patents

Procede et dispositif pour le dosage controle d'au moins un composant coulant Download PDF

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Publication number
EP0582625B2
EP0582625B2 EP92909623A EP92909623A EP0582625B2 EP 0582625 B2 EP0582625 B2 EP 0582625B2 EP 92909623 A EP92909623 A EP 92909623A EP 92909623 A EP92909623 A EP 92909623A EP 0582625 B2 EP0582625 B2 EP 0582625B2
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European Patent Office
Prior art keywords
hydraulic
positive displacement
metering
pressure
accordance
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German (de)
English (en)
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EP0582625B1 (fr
EP0582625A1 (fr
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Hans Willi Meinz
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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
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/005—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons
    • 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
    • F04B43/073—Pumps having fluid drive the actuating fluid being controlled by at least one valve
    • F04B43/0736—Pumps having fluid drive the actuating fluid being controlled by at least one valve with two or more pumping chambers in parallel
    • 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
    • F04B9/109—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
    • F04B9/111—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers with two mechanically connected pumping members
    • F04B9/115—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers with two mechanically connected pumping members reciprocating movement of the pumping members being obtained by two single-acting liquid motors, each acting in one direction

Definitions

  • the invention relates to a method for controlled Dosage of at least one flowable component by means of a driven by a metered hydraulic flow, from two equal positive displacement pumps each an oscillating displacement element formed Positive displacement pump unit for each component, wherein a dosing, which the metered hydraulic flow leads, via a power distribution unit with the hydraulic space the one positive displacement pump and an outflow line with the hydraulic chamber of the other positive displacement pump is connected, then the dosing with is connected to both hydraulic chambers, then the dosing with the hydraulic chamber of the other positive displacement pump and the discharge line with the hydraulic space which is connected to a positive displacement pump, then the dosing line again with both hydraulic chambers is connected and finally at the end of a Cycle and thus at the beginning of the next the dosing line again with the hydraulic chamber of a positive displacement pump and the discharge line with the hydraulic space the other positive displacement pump is connected, with each positive displacement pump, the outflow is shorter Time consuming as dosing and while dosing takes place.
  • the invention relates to an implementation the method according to the invention particularly suitable Contraption .
  • the medium to be dosed is difficult to handle because e.g. the flowable medium of one or more abrasive solids, e.g. Pigments, composed is, the medium also to crystallize or sticking, so that the used Dosing pumps due to wear or leaks already after a short time have undefined dosing errors.
  • the medium to be dosed is difficult to handle because e.g. the flowable medium of one or more abrasive solids, e.g. Pigments, composed is, the medium also to crystallize or sticking, so that the used Dosing pumps due to wear or leaks already after a short time have undefined dosing errors.
  • a method of controlled dosing indicate at least one flowable component and one for carrying out this method especially to provide a suitable device with or it is possible even difficult to promote media controlled to dose. It should process and device self-monitoring trouble-free and maintenance-free work over a long time with high precision and reproducibility and creeping occurring leaks and thus Quantitatively record and document dosing errors.
  • a reproducible high-precision dosage sets a pulsation and leakage-free conveying advance. Therefore So first, an unproblematic hydraulic flow generated pulsation-free, which without difficulty in the known oil-hydraulic metering devices can be done.
  • the dosage of the problematic Liquid takes place in a second cycle, the oscillating displacer from the oil circuit is disconnected.
  • a volume flow supplied on the hydraulic side displaces thus on the medium side equal volume.
  • Another advantage of this method is that the Filling stroke of the pumps basically in a shorter Time interval can be done as the Dosierhub. Thereby The necessary time is gained to wear all of them thus leaking components of the positive displacement pumps, such as. Inlet and outlet valves on the dosing and hydraulic side, at regular intervals, e.g. after each pump cycle, a leak test to undergo.
  • the pre-compression pressure will be up the pressure level of the dosing pressure raised to any pressure jumps when switching from one Pump to avoid the other.
  • this method can be a pulsation of about 1%, based on the instantaneous value can be achieved.
  • a device in which two identical, either self-priming or pre-pressure-feeding oscillating displacement pumps, each with a displacement element, are provided for each component, one hydraulic dosing unit is connected to each of the two hydraulic chambers of the two positive displacement pumps per component, in each case via a leakproof shut-off device, at least one hydraulic dosing unit is supplied by a hydraulic pressure source, a leak-tight shut-off device is arranged in each case in the inlet and outlet of the respective metering chamber and hydraulic chamber of each positive displacement pump, the shut-off devices located in the inlet and outlet of the hydraulic chamber are electromagnetically actuated 2/2 seat valves, In addition to the 2/2-seat valves, a 3/2-proportional pressure control valve is provided, which when switching the dosing and the outflow line by means of 2/2-seat valves over an adjustable period of time, a steady change in the flow rate and thus the Druckab-
  • a particularly simple design provide with Supply pressure to working positive displacement pumps, the only one between each dosing and hydraulic space oscillating displacer and a Housing exist.
  • the displacement elements are included hydraulically clamped between hydraulic and conveying medium, so that on both sides at frictionless Guide the displacement a nearly the same Setting pressure level. Freedom of friction is necessary in the switching points of the displacement no pressure build-up due to starting torques.
  • the pressurization of the displacement elements is done by a hydraulic dosing unit, the either from a hydraulic motor with mechanically coupled Servo- or stepper motor or a flowmeter with electrically coupled servo or Proportional valve exists. In each of these cases is one low-wear, high-precision dosage possible, where the necessary form from a hydraulic pressure source comes.
  • Be two or more devices used according to the invention is by an electric Coupling of the respective electrical setpoint generator (Servo or stepper motor and servo or proportional valve) a time-synchronous two- or multi-component dosing possible, both the dosing ratio as well as size and duration of the discharged Volumetric flow are arbitrary.
  • the valves of Positive displacement pumps in the inlet and outlet of the respective Dosing and hydraulic chamber are low-wear poppet valves, in the rest periods of the positive displacement pumps subjected to the leak test described in the process What is connected to each hydraulic chamber Pressure measuring device is used.
  • the Suction or. Filling and metering strokes of the two positive displacement pumps be through an electro-hydraulic control coordinated in time.
  • the controller has the Task, the hydraulic lines required to operate the pumps offset in time so connect that no short circuit to the tank can occur.
  • doses the first and the second pump sucks, in the other end position dosed the second Pump and the first pump sucks.
  • dosed the second Pump and the first pump sucks.
  • Each before the end a Dosierhubes must be a start signal to the other Displacer be delivered.
  • the device can be designed so that the displacement elements Membranes are.
  • the use of a Diaphragm as displacer for a pump for dosing of problematic media offers itself because of their constructional simplicity (low cost) as well as technical Advantages.
  • membranes With the help of membranes can be the Demand for leak-free and friction-free sealing the displacer meet the easiest.
  • membranes are compared to correspondingly leak-free sealed piston significantly cheaper and own.
  • the diaphragm without differential pressure is clamped between two liquids is It is possible to apply an almost arbitrary amount of pressure to it to transfer dosing medium.
  • the self-priming Execution must all with hydraulic fluid filled spaces each one pump during the metering stroke be shorted to a possible To avoid differential pressure on the membrane.
  • the device may be designed so that the membranes from at least two superimposed, a circumferential clamping single forming membranes exist, between each of which there is a gap located and that every space above a clamping point, each with a leakage derivation is provided.
  • hydrauiiscn acted upon Diaphragm pumps it is for the user of greatest importance, signaling a diaphragm break in time to get, so it does not cause the failure of entire pump unit can come.
  • the mixing caused by membrane rupture of the Dosing with the hydraulic fluid provides for the Users the most dreaded incident.
  • a membrane breakage message is possible through use a multi-layer membrane, with the gap be queried by a leakage monitoring can.
  • the device can be designed so that the displacement elements Bellows are.
  • Bellows made of austenitic Stainless steel is especially abrasive and / or corrosive media superior to other materials.
  • Another advantage of steel bellows is in that they are both on the flange and on the ground can be welded, resulting in optimal sealing ensured between hydraulic and dosing.
  • the device may be designed so that the bellows from at least two superimposed ones Partitions exist between each one there is a gap, and that every gap via a clamping point, each with a leakage discharge is provided.
  • a double or multi-walled Execution of the bellows allows a large Elasticity combined with high flexural rigidity (principle Leaf spring), which is a larger usable displacement volume of the bellows.
  • Another The advantage of a multi-layer steel bellows is greater safety to leak. In the case of a bellows break occurs either the hydraulic or the metering medium in the space between the partitions one and gets out there to either to trigger an alarm or shut down the device. In any case, leakage avoidance becomes active. before it is a mixture of dosing and hydraulic medium comes.
  • the device may be designed in such a way that the and outlet of the metering space located shut-off devices automatic check valves are.
  • These Execution represents a particularly simple constructive Solution of the inlet and outlet valves on the dosing medium side dar.
  • For small diameters and for a relative low stroke frequency are self-acting ball check valves which is also suitable for abrasive fluids suitable. As the ball in the liquid flow rotates, the occurring wear spreads to the entire Spherical surface.
  • the device can be designed so that the 2/2-seat valves are open when de-energized.
  • the pressure measuring device consists of an electrical pressure sensor. To the 3/2-proportional pressure control valve to drive a positive displacement pump for precompression can, it requires the pressure measurement by a pressure sensor of the other positive displacement pump. With the same pressure sensor will also be the different ones Leakage tests performed.
  • the device may be designed so that a staff Computer or a memory-programmable Control is provided, the / the pressure curve during the leak test.
  • the pressure gradient in dependency on the time must be recorded and compared with stored values. So is an evaluation of the tightness of the positive displacement pumps possible. For this task offers the Use of PLC or PC, especially because of the Controlling the positive displacement pumps such devices anyway required are.
  • the device may be designed so that in each Hydraulic space at least one by the position of the Displacement element controlled inductive proximity switch is arranged.
  • To the movement of the oscillating Coordinating displacers is one Position control of the displacer necessary.
  • the position control of the displacer takes place in each case by a pressure-resistant inductive Proximity switch, which has a groove on one of the Displacement fixed control rod monitored.
  • the device may be designed so that the inductive Proximity switch switched on in the unactuated state are.
  • the failure of an inductive proximity switch usually takes place without notice. This would have the absence of a signa! S As a consequence, which necessarily for the reversal of Displacer is needed. If this signal is missing, it would come to the failure of the entire device. remedy can through the use of an inductive proximity be created, which constantly outputs a signal. The reversal process is only initiated if the proximity switch gives no signal. falls the proximity switch due to a defect, he will de-energized and the respective displacement element hydraulically relieved.
  • the device may be designed so that in each Hydraulic space at least one by the position of the Displacer controlled controlled inductive transducer is arranged.
  • the advantage of the inductive Wegaut loveds lies in its thermal capacity and in the fact that he is the position of the displacement elements can capture continuously.
  • the device can be designed so that the position the Verdrangerelements by volumetric displacement measurement determined by means of the hydraulic dosing unit becomes.
  • the positive displacement pumps on location sensors are dispensed with when the metered Oil quantity as a measure of the distance traveled by the displacement element is used.
  • the disadvantage here is that after interruptions and other disturbances the position of the displacer can not be determined.
  • the device may be designed so that the controller the positive displacement pump unit a microprocessor control is (e.g., programmable logic controller or personal computer).
  • a microprocessor control e.g., programmable logic controller or personal computer.
  • the control of the device After the invention is of considerable importance to. It can basically be pneumatic, hydraulic or electrically. Already at one with two inductive proximity switches and four solenoid valves Equipped positive displacement pump unit offers a small compact programmable logic Control (PLC).
  • PLC programmable logic Control
  • the PLC has the advantage of a great flexibility. Leave process sequences thus optimally adapted to the individual requirements vote. By the additional possibility Error detection and diagnostics can cause incorrect operation timely intercepted and the maintenance time drastically shortened. Due to falling prices for personal computer is an economical use instead of a PLC even with less complex processes useful, especially then. if the Process flows should be visualized and documented. It will enable maintenance personnel to all machine-relevant data on the screen or to track at the printer. There is also an interface to
  • the embodiment according to the drawing has two identical mirror-symmetrical non-self-priming Positive displacement pumps 1,2, which are in each case a housing 3.4 are located.
  • the two positive displacement pumps 1,2 consist of one hydraulic chamber each 5.6 and each a dosing 7.8, each between a hydraulic chamber 5,6 and a dosing 7.8 each clamped a dome-shaped mold membrane 9,10 is, in each case on their the hydraulic chamber 5,6 facing side carries a control rod 11,12.
  • the Control rod 11,12 is constantly a signal to an inductive Proximity switch 13,14 off.
  • the Dosierhubende the positive displacement pump the Reversing process is initiated against it from the electrical control unit (not shown) with a Time delay as a function of the delivery rate the positive displacement pump 1.2, determined.
  • the filling stroke starts at the dosing stroke end.
  • the pressure sensors 21,22 and the 3/2-proportional pressure control valve 23 serve. Open at the beginning of the filling stroke the spring-loaded check valves 24,25 and close at the filling stroke end.
  • a hydraulic Dosing unit 28 which consists of a hydraulic motor 29 with mechanically coupled servo or stepper motor 30 exists, with the necessary form for the hydraulic motor 29 from a hydraulic pressure source 31, which also includes the 3/2-Proporlional horrregelventil 23 supplied with hydraulic pressure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Basic Packing Technique (AREA)
  • Fluid-Pressure Circuits (AREA)

Claims (16)

  1. Procédé pour le dosage contrôlé d'au moins un composant coulant à l'aide d'une unité de pompage volumétrique entraínée par un courant hydraulique dosé, composée de deux pompes volumétriques identiques (1, 2) possédant chacune un élément volumétrique oscillant (9, 10), procédé dans lequel un tuyau de dosage (19) qui conduit le courant hydraulique dosé, est raccordé à la chambre hydraulique (5) d'une des pompes volumétriques (1) par une unité de distribution du courant, et à la chambre hydraulique (6) de l'autre pompe volumétrique (2) par une conduite d'écoulement (20); ensuite, le tuyau de dosage (19) est relié à la chambre hydraulique (6) de l'autre pompe volumétrique (2), tandis que la conduite d'écoulement (20) est à nouveau raccordée à la chambre hydraulique (5) de l'une des pompes volumétriques (1); ensuite la conduite de dosage (19) es reliée aux deux chambres hydrauliques (5, 6), et enfin, à la fin d'un cycle et donc au début du suivant, la conduite de dosage (19) est à nouveau reliée à la chambre hydraulique (5) de la première pompe volumétrique (1), et la conduite d'écoulement (20) est reliée à la chambre hydraulique (6) de l'autre pompe volumétrique (2); ainsi, la procédure d'écoulement nécessite une période plus courte dans les deux pompes volumétriques (1, 2) que la procédure de dosage et al lieu pendant la procédure de dosage, caractérisé en ce que pendant les périodes d'inactivité de chacune des pompes volumétriques (1, 2) pendant lesquelles elle n'est raccordée ni à la conduite d'écoulement (20) ni au tuyau de dosage (19), de possibles modifications de la pression hydraulique dans l'une des chambres hydrauliques (5, 6) sont mesurées au cours d'un intervalle de temps défini.
  2. Procédé selon la revendication 1, caractérisé en ce que, pendant les périodes d'inactivité de chacune des pompes volumétriques (1, 2) pendant lesquelles elle n'est raccordée ni à la conduite d'écoulement (20) ni au tuyau de dosage (19), le médium hydraulique et de dosage est précomprimé par augmentation de la pression hydraulique dans la chambre hydraulique (5, 6) en question à l'aide d'une source de pression hydraulique (31) jusqu'à atteindre au maximum la pression de dosage, et que les modifications possibles de la pression hydraulique dans la chambre hydraulique correspondante (5, 6) sont ensuite mesurées au cours d'un intervalle de temps défini.
  3. Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que pendant les périodes d'inactivité des deux pompes volumétriques (1, 2), le médium hydraulique et de dosage est précomprimé par augmentation de la pression hydraulique dans la chambre hydraulique (5, 6) en question à l'aide d'une source de pression hydraulique (31) et que les modifications possibles de la pression hydraulique dans la chambre hydraulique correspondante (5, 6) sont ensuite mesurées au cours d'un intervalle de temps défini.
  4. Un dispositif pour la mise en oeuvre du procédé selon l'une des revendications ci-dessus pour le dosage contrôlé d'au moins un composant coulant, où
    chaque composant est équipé de deux pompes volumétriques oscillantes (1, 2) comportant chacune un élément volumétrique (9, 10), pompes qui sont auto-amorçantes, soit qui fonctionnent à l'aide d'un mécanisme d'alimentation à précompression,
    chaque composant comportant une unité de dosage hydraulique (28) raccordée aux deux chambres hydrauliques (5, 6) des deux pompes volumétriques (1, 2) au moyen d'un dispositif d'arrêt équipé de joints anti-fuites (15, 16);
    une unité de dosage hydraulique (28) au moins est alimentée par une source de pression hydraulique (31);
    à l'entrée et à la sortie de chacune des chambres de dosage (7, 8) et des chambres hydrauliques (5, 6) de chaque pompe volumétrique (1, 2) est installé un dispositif d'arrêt équipé de joints anti-fuites (15, 16, 17, 18; 24, 25, 26, 27),
    les dispositifs d'arrêt (15, 16, 17, 18) situés à l'entrée et la sortie de la chambre hydraulique (5, 6) sont des soupapes à siège 2/2 à actionnement électromagnétique,
    en plus des soupape à siège 2/2 (15, 16, 17, 18), une soupape proportionnelle 3/2 à régulation de pression (23) est aussi prévue, soupape qui peut modifier en permanence le flux volumétrique, et ainsi la réduction et l'augmentation de la pression sur une période prédéterminée lors de la commutation entre le tuyau de dosage (19) et la conduite d'évacuation (20) à l'aide des soupapes à siège 2/2 (15, 16, 17, 18),
    un dispositif de mesure de la pression (21, 22), composé d'un capteur de pression électrique, est raccordé à la chambre hydraulique (5, 6) de chaque pompe volumétrique (1, 2),
    et les pompes volumétriques (1, 2) sont équipées d'un système de contrôle qui coordonne le rythme de la course d'aspiration et des courses de remplissage et de dosage des pompes.
  5. Dispositif selon la revendication 4, caractérisé en ce que les éléments volumétriques (9, 10) sont des membranes.
  6. Dispositif selon la revendication 5, caractérisé en ce que le membranes sont composées au moins de deux membranes séparées placées l'une sur l'autre formant un point circulaire de support rigide, membranes entre lesquelles existe un espace et où chaque espace est équipé d'un drain de fuite par un point de support rigide.
  7. Dispositif selon la revendication 4, caractérisé en ce que les éléments volumétriques (9, 10) sont des soufflets.
  8. Dispositif selon la revendication 7, caractérisé en ce que les soufflets comportent au moins deux parois de séparation disposées l'une sur l'autre, parois entre lesquelles existe un espace et où chaque espace est équipé d'un drain de fuite par un point de support rigide.
  9. Dispositif selon l'une des revendications 4 à 8, caractérisé en ce que les dispositifs d'arrêt (15, 16, 17, 18) situés à l'entrée et la sortie de la chambre de dosage (7, 8) sont des soupapes de non-retour automatiques.
  10. Dispositif selon l'une des revendications 4 à 9, caractérisé en ce que les soupapes à siège 2/2 (15, 16, 17, 18) sont ouvertes lorsqu'aucun courant ne passe.
  11. Dispositif selon l'une des revendications 4 à 10, caractérisé en ce que un ordinateur personnel ou un système de pilotage programmable est prévu, ordinateur ou système qui analyse l'évolution de la pression pendant le test d'étanchéité.
  12. Dispositif selon l'une des revendications 4 à 11, caractérisé en ce que dans chaque chambre hydraulique (5, 6) se trouve au moins un détecteur de proximité à induction (13, 14) contrôlé par la position de l'élément volumétrique (9, 10).
  13. Dispositif selon la revendication 12, caractérisé en ce que les détecteurs de proximité à induction (13, 14) sont connectés en position non activée.
  14. Dispositif selon l'une des revendications 4 à 11, caractérisé en ce que, dans chaque chambre hydraulique (5, 6), se trouve au moins un capteur de déplacement à induction activé par la position de l'élément volumétrique (9, 10).
  15. Dispositif selon l'une des revendications 4 à 11, caractérisé en ce que la position de l'élément volumétrique (9, 10) est obtenue par mesure volumétrique du déplacement à l'aide de l'unité de dosage hydraulique (28).
  16. Dispositif selon l'une des revendications 4 à 15, caractérisé en ce que le contrôle de l'unité de pompage volumétrique est un système de contrôle par microprocesseur (par exemple un contrôleur programmable ou un ordinateur personnel).
EP92909623A 1991-05-03 1992-05-04 Procede et dispositif pour le dosage controle d'au moins un composant coulant Expired - Lifetime EP0582625B2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4114438 1991-05-03
DE4114438 1991-05-03
PCT/DE1992/000352 WO1992019867A1 (fr) 1991-05-03 1992-05-04 Procede et dispositif pour le dosage controle d'au moins un composant coulant

Publications (3)

Publication Number Publication Date
EP0582625A1 EP0582625A1 (fr) 1994-02-16
EP0582625B1 EP0582625B1 (fr) 1996-01-24
EP0582625B2 true EP0582625B2 (fr) 2005-01-05

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EP92909623A Expired - Lifetime EP0582625B2 (fr) 1991-05-03 1992-05-04 Procede et dispositif pour le dosage controle d'au moins un composant coulant

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EP (1) EP0582625B2 (fr)
JP (1) JPH06506999A (fr)
AT (1) ATE133471T1 (fr)
DE (1) DE59205185D1 (fr)
WO (1) WO1992019867A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE197837T1 (de) * 1995-12-28 2000-12-15 Wijk Engineering B V Van Doppelmembranpumpe
JP6362008B2 (ja) * 2015-02-09 2018-07-25 Smc株式会社 ポンプシステム及びポンプの異常検出方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3072462A (en) * 1959-09-17 1963-01-08 Controls Co Of America Mixing apparatus
DE2741024A1 (de) * 1977-09-12 1979-03-22 Wilms Gmbh Membranpumpe
US4778356A (en) * 1985-06-11 1988-10-18 Hicks Cecil T Diaphragm pump
JPS62131987A (ja) * 1985-12-05 1987-06-15 Takeshi Hoya 複式連結圧送装置
FR2605059B1 (fr) * 1986-10-08 1991-02-08 Schlumberger Cie Dowell Systeme de mesure de debit et de surveillance pour pompes a deplacement positif et pompes munies de ces systemes

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Publication number Publication date
EP0582625B1 (fr) 1996-01-24
ATE133471T1 (de) 1996-02-15
WO1992019867A1 (fr) 1992-11-12
EP0582625A1 (fr) 1994-02-16
DE59205185D1 (de) 1996-03-07
JPH06506999A (ja) 1994-08-04

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