EP0283026B1 - Méthode et dispositif de démarrage d'une pompe à membrane chargée - Google Patents

Méthode et dispositif de démarrage d'une pompe à membrane chargée Download PDF

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Publication number
EP0283026B1
EP0283026B1 EP88104287A EP88104287A EP0283026B1 EP 0283026 B1 EP0283026 B1 EP 0283026B1 EP 88104287 A EP88104287 A EP 88104287A EP 88104287 A EP88104287 A EP 88104287A EP 0283026 B1 EP0283026 B1 EP 0283026B1
Authority
EP
European Patent Office
Prior art keywords
chamber
pump
pressure chamber
connection channel
pressure
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 - Lifetime
Application number
EP88104287A
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German (de)
English (en)
Other versions
EP0283026A2 (fr
EP0283026A3 (en
Inventor
Horst Fritsch
Josef Dr. Jarosch
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.)
Lewa Herbert Ott GmbH and Co KG
Original Assignee
Lewa Herbert Ott GmbH and Co KG
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Filing date
Publication date
Application filed by Lewa Herbert Ott GmbH and Co KG filed Critical Lewa Herbert Ott GmbH and Co KG
Priority to AT88104287T priority Critical patent/ATE86363T1/de
Publication of EP0283026A2 publication Critical patent/EP0283026A2/fr
Publication of EP0283026A3 publication Critical patent/EP0283026A3/de
Application granted granted Critical
Publication of EP0283026B1 publication Critical patent/EP0283026B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04B43/02—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 invention relates to a method for starting a hydraulic diaphragm pump against load according to the preamble of claim 1 and a device provided for carrying out this method according to the preamble of claim 4.
  • a start-up circuit is already known (FR-A-1 069 107) which is on the oil side, that is to say on the drive side the diaphragm pump, is arranged and designed such that it works automatically. This makes it possible to achieve a smooth start of the diaphragm pump under load without the drive having to be designed for the high breakaway torque.
  • an automatic start-up circuit has some shortcomings. These are not only the fact that such an automatic start-up circuit is subject to the influence of manufacturing tolerances, stroke frequencies of the displacer piston and viscosity of the hydraulic fluid, without it being possible to eliminate such adverse influences by appropriate countermeasures.
  • the pump once the known automatic start-up circuit has been set up and set, the pump also has a very specific start-up characteristic which cannot be changed later or only with considerable effort.
  • Diaphragm pumps are also already known (US Pat. Nos. 3,767,326 and 3,374,750), in which a connecting line is provided between the pressure chamber and the storage chamber, the opening or interruption of which is valve-controlled (batch control).
  • the two solenoid valves provided for this purpose are controlled as pure open-close valves, in opposite directions, so that it is not possible with such a device to achieve a smooth coupling of the pump to the pressure network.
  • the invention has for its object to develop the method and the device of the generic type in such a way that they work reliably with little design effort and make it possible to implement different start-up characteristics of the pump.
  • the interruption of the connection between the pressure chamber and the storage chamber is controlled externally, specifically at the minimum speed of the pump, which corresponds to a fraction of the nominal speed.
  • the invention is based on the essential idea of moving the starting device from the product side to the oil side, that is to say from the delivery side to the drive side, and for this purpose to provide a connecting channel between the pressure chamber and the storage chamber, which is basically open, but after the commissioning of the Pump is closed slowly or quickly, whereby the pressure in the pressure chamber then increases up to the delivery pressure.
  • the required breakaway torque is therefore only a fraction of that without a starting device, so that there is the decisive advantage that the pump drive in essentially only for the nominal torque, but not for the breakaway torque.
  • This has the further advantage that the drive motor designed for the nominal torque works with a significantly better efficiency than the otherwise required drive motor which is matched to the breakaway torque and is therefore much larger in size.
  • the closing device by means of which the connecting channel can be gradually closed, has a movable closing body.
  • this can have different structural configurations, namely in the form of a valve, a control slide, a control piston or the like.
  • the closing body is preferably arranged in a connection hole accessible from the outside, which is expediently provided at a kink of the connecting channel in such a way that two partial sections of the connecting channel, namely a channel section on the pressure chamber side and a channel section on the storage chamber side, are formed, which are connected by the connection hole.
  • the closing body of the closing device is actuated from the outside via an actuator, be it electrically, magnetically or pneumatically.
  • the actuator can work depending on the number or frequency of the strokes of the displacement piston, in such a way that after the pump is switched on, the passage cross-section of the connecting channel available for the displaced hydraulic fluid is reduced with each additional pressure stroke.
  • the mode of operation of the diaphragm pump provided with a starting device according to the invention is accordingly such that the diaphragm pump is switched on and raised to a minimum speed, it not yet delivering in this state.
  • the hydraulic fluid (displacement volume) displaced by the displacement piston pulsates back and forth as an oil flow in the still open connecting channel to a greater or lesser extent without the membrane moving.
  • the membrane which cannot move to the product delivery chamber due to the system pressure in the system, migrates to the rear pressure chamber-side limitation cap or is already there. This ensures that the membrane is not overstretched when starting.
  • the diaphragm pump head in question is then gently connected to the pressure network of the system, so that overall there is a gentle start-up under load without the usual high breakaway torque being overcome and the pump drive accordingly being too strong must be oversized.
  • the locking device is actuated from the outside by means of a suitably controlled actuator.
  • the start-up characteristic of the diaphragm pump can be easily adapted to the characteristics of the pump drive by appropriate design of the closing body and the flow resistance of the individual sections of the connecting channel.
  • the closing body is actuated from the outside via electrically, hydraulically or pneumatically operating actuators, independently of the pressure change processes in the pump. In this way, different start-up characteristics can be realized, and the influence of manufacturing tolerances, stroke frequencies of the displacer piston and viscosity of the hydraulic fluid is eliminated.
  • the typical torque-speed characteristic curve for a three-cylinder pump, for example, which has no starting device is designed such that it has a high starting torque, the so-called. Breakaway torque, which is almost twice the nominal torque.
  • the dashed line shows the considerably reduced breakaway torque in a diaphragm pump provided with the starting device according to the invention, so that the pump drive must at best be designed for the nominal torque or full load torque.
  • the starting device is provided in a hydraulic diaphragm pump which has a conventional diaphragm 1. This is clamped at its edge between a pump body 2 and a pump cover 3 which is detachably attached to the end thereof and separates a delivery chamber 4 from a pressure chamber 5 filled with hydraulic fluid.
  • the diaphragm pump shown has a hydraulic diaphragm drive in the form of an oscillating displacement piston 6, which is located in the pump body 2 sealed between the pressure chamber 5 and a storage space 7 for the hydraulic fluid is displaceable.
  • the piston-side pressure chamber 5 is connected via a plurality of axial bores 8 arranged in the pump body 2 to a membrane-side pressure chamber 9, which is delimited on the one hand by the membrane 1 and on the other hand by a rear (piston-side) dome 10.
  • the membrane 1 lies against this rear limiting cap 10 at the end of the suction stroke, as shown in dashed lines in FIG. 2, while it comes to bear against a front limiting cap 11 at the end of the pressure stroke.
  • the front limiting cap 11 is formed in the pump cover 3, which has a spring-loaded inlet valve 12 and a spring-loaded outlet valve 13 in the usual manner. These two valves 12, 13 are connected via an inlet duct 14 and an outlet duct 15 to the delivery chamber 4 in such a way that the delivery medium during the suction stroke of the displacement piston to the right according to FIG. 2 6 and thus the membrane 1 is sucked into the delivery chamber 4 in the direction of the arrow via the inlet valve 12 and the inlet channel 14. During the pressure stroke of the diaphragm 1 to the left according to FIG. 2, the pumped medium is then pressed out of the pumping chamber 4 in a metered manner via the outlet channel 15 and the outlet valve 13.
  • a customary spring-loaded sniffer valve 16 is provided in the pump body 2, which connects to the pressure chamber 5 or 9 and the storage chamber 7 via channels 17, 18, 19 stands.
  • the starting device A provided in the diaphragm pump described has a connecting channel 20 which runs between the pressure chamber 5 and the storage chamber 7 and can be closed by a closing body to be explained in more detail after the pump has been started up.
  • the closing body is displaceable in a connection bore 22 which is accessible from the outside and is closed by a plug 21 and which is arranged at a kink of the connection channel 20 such that the section of the connection channel 20 on the pressure chamber side into the bottom of the connection hole 22 and the section of the connection channel 20 on the storage chamber side the side wall of the connection bore 22 opens.
  • the Starting device as a closing body on a control slide 23 which is displaceable in the connection bore 22, specifically within a sleeve 24 inserted therein.
  • the sleeve 24 is provided with a transverse through bore 25 and a longitudinal channel 26 in such a way that the flow connection between the section of the connecting channel 20 on the pressure chamber side and its section on the supply side is maintained.
  • the control slide 23 has a circumferential groove 27 such that the connecting channel 20 is open when the control slide 23 is in the starting position according to FIG. 3, but is closed when the control slide 23 is in the dashed operating position.
  • the control slide 23 which establishes the connection between the pressure chamber 5 and the storage chamber 7 via the connecting channel 20 and the channels 25, 26, 27 interacting therewith, is in the starting position according to FIG. 3 when the pump is switched on. Then when the pump is slowly started up from the minimum speed, the control slide 23 is also moved downward, so that the circumferential groove 27 provided in the control slide 23 also moves away from the connection channel 20 on the storage space side. As a result, the passage cross section of the connecting channel 20 is reduced until the control slide 23 has shifted completely downward into the operating position according to FIG. 3, in which the connecting channel 20 is completely closed. In this position, the pump has reached the delivery pressure, so that the diaphragm pump head is switched on to the system pressure network.
  • the control slide 23 is actuated via an actuator 33, which in turn can be actuated electrically, magnetically or pneumatically.
  • the actuator 33 attached to the outside of the plug 21 of the connecting bore 22 is connected to the control slide 23 via an actuating plunger 34, so that the control slide 23 according to the stroke rhythm of the displacer 6 from its starting position, in which the connecting channel 20 is open, after can be shifted below into its operating position shown in dashed lines, in which the connecting channel 20 is closed.
  • valve tappet 35 connected to the actuating tappet 34 is provided, which cooperates with a valve seat 36.
  • This valve seat 36 is formed in the connection bore 22 by a shoulder formed there on the bottom side of the section of the connecting channel 20 on the pressure chamber side. Accordingly, this valve 35, 36 - analogous to the control slide 23 - can be moved by means of the actuator 33 between a starting position in which the connecting channel 20 is open and an operating position in which the connecting channel 20 is closed.

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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)

Claims (9)

  1. Procédé dur démarrer une pompe hydraulique à membrane à l'encontre d'une charge, à l'aide d'un circuit de démarrage, selon lequel l'actionnement d'un membrane séparant une chambre d'alimentation d'une chambre hydraulique se fait grâce à un piston de déplacement mobile, suivant un mouvement de va-et-vient, entre la chambre de pression et une chambre formant réservoir hydraulique, et selon lequel, lors du démarrage de la pompe, un volume déplacé du liquide hydraulique est transporté par le piston de déplacement (6) dans un passage de liaison (20) ouvert prévu entre la chambre de pression (5) et la chambre formant réservoir (7), après quoi le mouvement de la membrane (1) fait suite au déplacement du piston (6) grâce au fait que la liaison entre la chambre de pression (5) et la chambre formant réservoir (7) est interrompue, caractérisé en ce que l'interruption de la liaison entre la chambre de pression (5) et la chambre formant réservoir (7) se fait, commandée de l'extérieur, à la vitesse minimale de la pompe qui correspond à une fraction de la vitesse nominale.
  2. Procédé selon la revendication 1 caractérisé en ce que le volume déplacé du liquide hydraulique circule dans le passage de liaison (20) prévu entre la chambre de pression (5) et la chambre formant réservoir (7).
  3. Procédé selon la revendication 1, caractérisé en ce que le volume déplacé du liquide hydraulique s'écoule, dans le passage de liaison (20) prévu entre la chambre de pression (5) et la chambre formant réservoir (7), en raison du piston de déplacement (6), de manière à produire des pulsations.
  4. Dispositif pour la mise en oeuvre du procédé selon l'une des revendications 1 à 3, étant précisé que la pompe à membrane est pourvue d'au moins une membrane (1) séparant une chambre d'alimentation (4) d'une chambre de pression hydraulique (5), qui est serrée, au niveau de son bord, entre le corps de pompe (2) et un couvercle de pompe (3), et d'un mécanisme de commande hydraulique de membrane se présentant sous la forme d'un piston de déplacement (6) mobile dans le corps de pompe (2), suivant un mouvement de va-et-vient, entre la chambre de pression (5) et une chambre formant réservoir hydraulique (7), et qu'il est prévu, côté entraînement de la pompe, entre la chambre de pression (5) et la chambre formant réservoir (7), un canal de liaison (20) qui ramène dans la chambre formant réservoir (7) le liquide hydraulique déplacé dans la chambre de pression (5) par le piston de déplacement (6) lors du démarrage de la pompe, et qui est apte à être fermé à l'aide d'un dispositif de fermeture (A), lors des courses suivantes du piston de déplacement (6), de sorte que la pression monte, dans la chambre de pression (5), jusqu'à atteindre la pression d'alimentation, caractérisé en ce que la commande du dispositif de fermeture (A) se fait de l'extérieur, par l'intermédiaire d'un servomoteur (33), étant précisé que le moment de fermeture et/ou la vitesse de fermeture sont variable, et en ce que le dispositif de fermeture (A) possède un organe de fermeture (23 ; 35, 36) qui est mobile entre une position de départ dans laquelle il dégage la section transversale de passage du canal de liaison (20), et une position de fonctionnement dans laquelle ladite section du canel de liaison (20) est fermée.
  5. Dispositif selon la revendication 4, caractérisé en ce que le servomoteur (33) fonctionne suivant le nombre ou la fréquence des courses du piston de déplacement (6), de telle sorte qu'après la connexion de la pompe, la section transversale de passage du canal de liaison (20) disponible pour le liquide hydraulique déplacé diminue à chaque course de pression.
  6. Dispositif selon la revendication 4 ou 5, caractérisé en ce que l'organe de fermeture est une soupape (35, 36) dont le corps de soupape (35) coopère avec un siège de soupape (36) formé dans le canal de liaison (20).
  7. Dispositif selon la revendication 4 ou 5, caractérisé en ce que l'organe de fermeture est un tiroir de distribution (23) qui est disposé sur le trajet d'écoulement du canal de liaison (20) et commande, par l'intermédiaire d'un canal de passage (27), la taille de la section transversale de passage du canal de liaison (20).
  8. Dispositif selon l'une des revendications 4 à 7, caractérisé en ce que l'organe de fermeture (23; 35, 36) est mobile dans un perçage do raccordement (22) accessible de l'extérieur.
  9. Dispositif selon la revendication 8, caractérisé en ce que le perçage do raccordement (22) est disposé à un coude du canal de liaison (20) de telle sorte que la section de celui-ci située côté chambre de pression débouche dans le fond du perçage de raccordement (22), tandis que sa section située côté chambre formant réservoir débouche dans la paroi du perçage de raccordement (22).
EP88104287A 1987-03-18 1988-03-17 Méthode et dispositif de démarrage d'une pompe à membrane chargée Expired - Lifetime EP0283026B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88104287T ATE86363T1 (de) 1987-03-18 1988-03-17 Verfahren und vorrichtung zum anfahren einer hydraulischen membranpumpe gegen last.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873708868 DE3708868A1 (de) 1987-03-18 1987-03-18 Verfahren und vorrichtung zum anfahren einer hydraulischen membranpumpe gegen last
DE3708868 1987-03-18

Publications (3)

Publication Number Publication Date
EP0283026A2 EP0283026A2 (fr) 1988-09-21
EP0283026A3 EP0283026A3 (en) 1989-08-30
EP0283026B1 true EP0283026B1 (fr) 1993-03-03

Family

ID=6323418

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88104287A Expired - Lifetime EP0283026B1 (fr) 1987-03-18 1988-03-17 Méthode et dispositif de démarrage d'une pompe à membrane chargée

Country Status (5)

Country Link
US (1) US4865528A (fr)
EP (1) EP0283026B1 (fr)
JP (1) JPS63314384A (fr)
AT (1) ATE86363T1 (fr)
DE (2) DE3708868A1 (fr)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5171129A (en) * 1989-11-14 1992-12-15 Mechanical Technology Incorporated Hydraulically driven reciprocating compressor having a free-floating diaphragm
US5262068A (en) * 1991-05-17 1993-11-16 Millipore Corporation Integrated system for filtering and dispensing fluid having fill, dispense and bubble purge strokes
JPH062664A (ja) * 1992-06-22 1994-01-11 Nippon Soken Inc ダイアフラム式ポンプ
DE4327969C2 (de) * 1993-08-19 1997-07-03 Ott Kg Lewa Hydraulisch angetriebene Membranpumpe
DE4327970C2 (de) * 1993-08-19 1997-07-03 Ott Kg Lewa Hydraulisch angetriebene Membranpumpe mit mechanischer Membranhubbegrenzung
DE19726239B4 (de) * 1997-06-20 2014-04-03 Linde Hydraulics Gmbh & Co. Kg Hydrostatisches Antriebssystem mit einer Pumpe und einer Mehrzahl von daran angeschlossenen Verbrauchern
US6052430A (en) * 1997-09-25 2000-04-18 Siemens Medical Systems, Inc. Dynamic sub-space intensity modulation
EP1058006B1 (fr) * 1998-02-17 2012-09-12 Nikkiso Company, Ltd. Pompe a membrane
US6071089A (en) * 1998-02-20 2000-06-06 General Motors Corporation Hydraulic diaphragm pump
DE10056568C1 (de) * 2000-11-15 2002-01-03 Horst Kleibrink Vorrichtung zur Einhaltung der korrekten Ölüberströmmenge an Membrankompressoren
JP4587098B2 (ja) * 2004-07-21 2010-11-24 Ｓｍｃ株式会社 ポンプ装置
US7425120B2 (en) * 2005-04-26 2008-09-16 Wanner Engineering, Inc. Diaphragm position control for hydraulically driven pumps
US7665974B2 (en) * 2007-05-02 2010-02-23 Wanner Engineering, Inc. Diaphragm pump position control with offset valve axis
JP2014177932A (ja) * 2013-03-15 2014-09-25 Komatsu Denshi Kk マイクロポンプの駆動装置
DE102014109801A1 (de) * 2014-07-11 2016-01-14 Prominent Gmbh Membranpumpe mit reduzierter Leckageergänzung im Überlastfall
DE102018111601B4 (de) * 2018-05-15 2020-09-24 Prominent Gmbh Membrananlagensteuerung mit magnetisch gehaltenem Verschlusselement

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1069107A (fr) * 1952-11-05 1954-07-05 Pompe à chambre de compression auto-contrôlée
DE1017469B (de) * 1953-02-07 1957-10-10 Jean Louis Gratzmuller Vorrichtung zur selbsttaetigen Entlastung von Pumpen
FR1373780A (fr) * 1963-08-19 1964-10-02 Perfectionnements aux pompes à diaphragme
DE1528474B1 (de) * 1966-03-01 1970-07-23 Lewa Herbert Ott Fa Hydraulische Steuereinrichtung an einer Membranpumpe
DE1653512A1 (de) * 1966-10-04 1970-08-27 Lewa Herbert Ott Fa Hydraulisch betaetigte Pumpe mit magnetischer Foerderstromregelung
FR1589105A (fr) * 1968-08-14 1970-03-23
US3767326A (en) * 1972-08-04 1973-10-23 Yarway Corp Volumetric flow control system for pumps
JPS5536590A (en) * 1979-07-06 1980-03-14 Matsushita Electric Works Ltd Method of attaching piece to ceiling
JPS6123520U (ja) * 1984-07-19 1986-02-12 光洋精工株式会社 ころ軸受

Also Published As

Publication number Publication date
DE3708868A1 (de) 1988-10-06
EP0283026A2 (fr) 1988-09-21
EP0283026A3 (en) 1989-08-30
ATE86363T1 (de) 1993-03-15
US4865528A (en) 1989-09-12
DE3708868C2 (fr) 1990-08-23
DE3878706D1 (de) 1993-04-08
JPS63314384A (ja) 1988-12-22

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