EP0175105B1 - Pompe à membrane, particulièrement pour le dosage de liquides - Google Patents

Pompe à membrane, particulièrement pour le dosage de liquides Download PDF

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Publication number
EP0175105B1
EP0175105B1 EP85109557A EP85109557A EP0175105B1 EP 0175105 B1 EP0175105 B1 EP 0175105B1 EP 85109557 A EP85109557 A EP 85109557A EP 85109557 A EP85109557 A EP 85109557A EP 0175105 B1 EP0175105 B1 EP 0175105B1
Authority
EP
European Patent Office
Prior art keywords
membrane
valve
pump according
membrane pump
spring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP85109557A
Other languages
German (de)
English (en)
Other versions
EP0175105A1 (fr
Inventor
Klaus Dipl. Ing. Müller
Sieghard Dipl. Ing. Oberacker
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.)
WOLFGANG EICHLER KG
Original Assignee
Wolfgang Eichler KG
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 Wolfgang Eichler KG filed Critical Wolfgang Eichler KG
Publication of EP0175105A1 publication Critical patent/EP0175105A1/fr
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Publication of EP0175105B1 publication Critical patent/EP0175105B1/fr
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
    • F04B43/14—Machines, pumps, or pumping installations having flexible working members having peristaltic action having plate-like flexible members

Definitions

  • the invention relates to a diaphragm pump, in particular for dosing liquids with a diaphragm delimiting a dosing chamber with suction and pressure valve on the one hand, and a hydraulic working chamber with drive piston and pressure relief valve on the other hand, which delimits a chamber connected to the working chamber via at least one overflow channel, in the area of the Overflow duct a plunger is guided with a valve plate for the opposite openings of the overflow duct and that the valve unit consisting of the plunger and the valve plates is operatively connected to the membrane.
  • Diaphragm pumps of this type which are also referred to as piston diaphragm pumps, are known in a large number of embodiments. Their principle of operation is that the elastically deformable membrane executes its stroke under changing hydraulic pressure in the work area, whereby it sucks in the liquid to be delivered during the suction stroke, in which it enlarges the metering space, via the suction valve and during the pressure stroke, during which it moves into the Moved the dosing chamber in, pressed the pressure valve.
  • the pressure change in the work area is generated by a piston which closes the latter and is actuated by an oscillating drive, for example an eccentric.
  • the membrane Since the membrane has a comparatively small wall thickness due to the required elasticity and the necessary working stroke, it is sensitive to excessive stress. Such overloading can occur, for example, when the suction head is too high or when the suction line is closed or blocked, or else when there are leaks in the suction or pressure valve. It manifests itself in the fact that the membrane is overstretched and possibly permanently deformed or even tears in extreme cases. This not only makes the diaphragm pump inoperative, it can also mix hydraulic working fluid and dosing medium, which leads to corresponding consequential damage.
  • support devices which limit the membrane stroke.
  • These support devices generally consist of disks shaped like spherical caps, which are provided with a plurality of channels in order - depending on the arrangement of the support devices - to allow the working medium or dosing medium to pass through.
  • the membrane contacts the calotte.
  • damage can still occur if the membrane is deformed into the channels if the pressure difference is too high, so that permanent deformations or even cracks occur.
  • a chamber is provided between the dosing space and the working space, which chamber adjoins the dosing space via the membrane and is connected to the working space via an overflow channel.
  • a valve rod is guided, each of which has a valve disk for the opposite openings of the overflow channel.
  • the diaphragm is attached to this valve unit consisting of valve rod and valve plates by means of a screw connection.
  • Another known device also shows a valve unit which is firmly connected to the membrane.
  • One end of the valve unit attached to the membrane uses it as a support and guide, the other end of the valve unit being guided in a drawer bearing.
  • the valve unit receives no support in the area of the overflow channel, so that the membrane is also exposed to the forces resulting from the fixing of the valve unit in addition to the suction and pressure forces.
  • This and the aforementioned device also have the disadvantage that by fixing one end of the valve unit, the homogeneity and the elastic structure of the membrane is disturbed and can therefore tear easily at higher pressure differences.
  • the invention has for its object to provide a diaphragm pump which is equipped with a functionally reliable and effective against any kind of overload membrane protection.
  • valve unit lies loosely against the diaphragm under the action of a weak spring via a support disk.
  • the function of the diaphragm pump is as follows: In normal metering operation, in which the diaphragm is moved back and forth by the hydraulic working medium, the tappet with the valve unit follows this movement, the working medium coming from the working space through the overflow channels into the chamber and at the back the membrane is present.
  • the distance between the valve disks from one another or their distance from the opposite openings of the overflow channels is dimensioned such that the valve unit does not reach the closed position at least during the pressure stroke, since otherwise the delivery rate would be impaired.
  • the membrane is therefore not as in generic state of the art - held in their limit positions by mechanical support devices, but lies loosely on the valve unit on the support disc, so that any overuse is excluded. This membrane protection is absolutely reliable in any operating situation.
  • the valve unit of the membrane is under the action of a weak spring force, which is advantageously dimensioned so small that it makes no active contribution to the deflection of the membrane.
  • the spring force is only intended to overcome the frictional forces of the tappet guide and the inertial forces of the system, that is, it should always ensure that the valve unit is in contact with the diaphragm during the pressure stroke.
  • it provides no or no significant resistance to the movement of the membrane during the suction stroke.
  • an insert is provided between the chamber and the hydraulic working space, in which the tappet of the valve unit is guided on the one hand and the overflow channel is arranged on the other hand.
  • a plurality of overflow channels surrounding the tappet or its guide are preferably provided in the insert, the opposite openings of which on each side of the partition are covered by one of the valve disks of the valve unit. Each valve disk therefore closes all openings on one side of the overflow channels.
  • a conical seat is incorporated on both sides of the insert, the small diameter of which corresponds approximately to the diameter of the outer enveloping circle of the openings of the overflow channels. This creates a single central sealing surface for all overflow channels.
  • the valve disks also advantageously have a conical surface as a sealing surface.
  • the spring generating the spring force is arranged between the two valve plates and is supported on the one hand within the insert and on the other hand on the valve plate facing the membrane.
  • the spring is a helical spring which is supported on the one hand on the support disk and on the other hand on the opposite side of the insert and surrounds the tappet.
  • the inventive design of the membrane protection which prevents overstressing or damage to the membrane even in extreme operating conditions, makes it possible to use a very thin-walled membrane and thus also one made of plastic, in particular PTFE.
  • the membrane pump according to FIG. 1 has a multi-part housing, which consists of a tank 1 for the hydraulic working medium, a piston housing 2, a valve head 3 and a metering head 4, which are mounted axially one behind the other.
  • a drive motor 5 with a worm gear 6 which drives an eccentric 7.
  • the eccentric 7 acts on a hollow piston 8 which is guided in the piston housing 2 and is provided in the region of its drive side with a transverse bore 9 for the transfer of the hydraulic medium from the tank 1 into the cavity of the piston.
  • the piston 8 is also overlapped by a control slide 10 which, as a gate control, enables the working stroke to be adjusted.
  • the piston 8 is finally under the action of a spring 11 which keeps it in contact with the eccentric 7.
  • the cavity of the piston 8 and a space 12 in front of it in the piston housing 2 and a chamber 13 arranged in the valve head 3 form the working space of the metering pump, the space 12 being connected to the tank 1 via a pressure relief valve 27.
  • the chamber 13 is delimited on the front by a metering diaphragm 14, which at the same time forms the rear end of a metering chamber 15.
  • the dosing chamber 15 is connected to the medium to be conveyed via a suction valve and also has a pressure valve 17.
  • the chamber 13 is also equipped with a vent valve 18.
  • a plurality of overflow channels 19 are arranged concentrically about a common axis in a partition wall formed by the valve head 3, as can be seen in particular from FIGS. 2 and 3.
  • a tappet 20 is axially aligned within the valve head and is concentrically surrounded by the overflow channels 19 in the region of the guide.
  • the plunger 20 has on both sides of the partition wall formed by the valve head 3 each a valve plate 21, 22, which cooperate with a corresponding conical seat 23 or 28, which are incorporated in the partition wall and expand the overflow channels 19 to the outside.
  • the tappet 20 with the valve disks 21, 22 and the conical seats 23, 28 form the valve unit 30 serving to protect the membrane 14.
  • the plunger 20 has an extension 29 at the end opposite the valve plate 21 a support disc 24, which is supported on the other valve plate 22 via a spacer sleeve 25.
  • the support disk 24 lies loosely against the membrane 14 under the action of a spring 26, which is supported on the wall of the chamber 13.
  • FIG. 2 The extreme position of the diaphragm 14 during the pressure stroke can be seen in FIG. 2, in which the vantile cone 21 closes the overflow channels 19 with respect to the working space 12, the piston 8, while FIG. 3 shows the other limit position during the suction stroke, in which the valve cone 22 overflows the overflow channels 19 closes.
  • the membrane In both limit positions, the membrane is hydraulically decoupled from the work area so that it cannot be loaded beyond the limit positions.
  • FIG. 4 shows a modified embodiment of the valve unit 30, which has particular advantages in terms of production and assembly. It in turn has a tappet 20, on each of which ends a valve plate 21, 22 is attached, which in turn cooperate with conical seats 23, 28.
  • the conical seats 23, 28, like the overflow channels 19, are arranged on an insert 31, which in turn is inserted tightly into the valve head 3 (FIG. 1).
  • the insert 31 has a bore of larger diameter between the overflow channels 19 and the valve plate 22 facing the membrane 14 (FIG. 1), in which the spring 26 is arranged, which is supported on the one hand in the insert 31 and on the other hand on the valve plate 22 and thus the valve unit 30 urges towards the membrane 14.

Landscapes

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

Claims (10)

1. Pompe à membrane, notamment pour doser des liquides, comportant une membrane délimitant, d'une part, une chambre de dosage avec soupape d'admission et soupape de refoulement et, d'autre part, une chambre de travail hydraulique avec piston de commande et clapet de surpression, laquelle membrane délimite une chambre reliée à la chambre de travail par au moins un conduit de décharge, un poussoir, comportant une tête de soupape pour chaque ouverture opposée du conduit de décharge étant guidé dans la zone du conduit de décharge, et l'ensemble de soupape composé du poussoir et des têtes de soupape étant en liaison fonctionnelle avec la membrane, caractérisée en ce que l'ensemble de soupape (30) appuie librement contre la membrane par l'intermédiaire d'un disque de soutien (24) assujetti à un ressort (26) de force élastique faible.
2. Pompe à membrane selon la revendication 1, caractérisée en ce que le ressort (26) présente une force élastique qui doit simplement vaincre les forces de frottement du guidage du poussoir et les forces d'inertie en cas d'équilibre hydraulique sur les deux côtés de la membrane (14).
3. Pompe à membrane selon la revendication 1 ou 2, caractérisée en ce que l'ensemble de soupape (30) comporte un prolongement (29) traversant la chambre (13) lequel porte le disque de soutien appuyant contre la membrane (14).
4. Pompe à membrane selon l'une des revendications 1 à 3, caractérisée en ce qu'on prévoit entre la chambre (13) et la chambre de travail hydraulique (12) une garniture (31) dans laquelle, d'une part est guidé le poussoir (20) de l'ensemble de soupape (30) et dans laquelle, d'autre part, est disposé le conduit de décharge (19).
5. Pompe à membrane selon l'une des revendications 1 à 4, caractérisée en ce qu'on dispose dans la garniture (31) plusieurs conduits de décharge (19) entourant le poussoir (20) ou son guidage, conduits dont les ouvertures opposées de part et d'autre de la paroi de séparation sont respectivement recouvertes par l'une des têtes de soupape (21 ou 22) de l'ensemble de soupape (30).
6. Pompe à membrane selon l'une des revendications 1 à 5, caractérisée en ce que sur les deux côtés de la garniture (31) est usiné un siège conique (23, 28) dont le petit diamètre correspond sensiblement au diamètre du cercle constituant l'enveloppe extérieure des conduits de décharge (19).
7. Pompe à membrane selon la revendication 6, caractérisée en ce que les têtes de soupape (21, 22) comportent également une surface conique comme surface d'étanchéité.
8. Pompe à membrane selon l'une des revendications 1 à 7, caractérisée en ce que le ressort (26) est disposé entre les deux têtes de soupape (21,22) et il s'appuie, d'une part à l'intérieur de la garniture, et d'autre part contre la tête de soupape (22) tournée vers la membrane (14).
9. Pompe à membrane selon l'une des revendications 1 à 7, caractérisée en ce que le ressort est un ressort hélicoïdal (26) s'appuyant, d'une part contre le disque de soutien (24) et d'autre part, contre le côté de la chambre (13) lui faisant face.
10. Pompe à membrane selon l'une des revendications 1 à 9, caractérisée en ce que la membrane (14) est en matière plastique.
EP85109557A 1984-08-21 1985-07-30 Pompe à membrane, particulièrement pour le dosage de liquides Expired EP0175105B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843430721 DE3430721A1 (de) 1984-08-21 1984-08-21 Membranpumpe, insbesondere zum dosieren von fluessigkeiten
DE3430721 1984-08-21

Publications (2)

Publication Number Publication Date
EP0175105A1 EP0175105A1 (fr) 1986-03-26
EP0175105B1 true EP0175105B1 (fr) 1987-10-14

Family

ID=6243546

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85109557A Expired EP0175105B1 (fr) 1984-08-21 1985-07-30 Pompe à membrane, particulièrement pour le dosage de liquides

Country Status (4)

Country Link
US (1) US4619589A (fr)
EP (1) EP0175105B1 (fr)
JP (1) JPS6161990A (fr)
DE (2) DE3430721A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109458316A (zh) * 2018-09-29 2019-03-12 陕西科技大学 一种硫酸进料泵

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US5163820A (en) * 1987-11-16 1992-11-17 Karldom Corporation Airless sprayer with adjustable pressure unloading valve
DE8816172U1 (de) * 1988-12-30 1989-02-16 ALLTECH Dosieranlagen GmbH, 7504 Weingarten Dosierpumpe
JPH03149371A (ja) * 1989-11-02 1991-06-25 Nippon Fuiidaa Kogyo Kk ダイヤフラムポンプ
US5186615A (en) * 1990-06-26 1993-02-16 Karldom Corporation Diaphragm pump
US5165869A (en) * 1991-01-16 1992-11-24 Warren Rupp, Inc. Diaphragm pump
US5249932A (en) * 1991-10-07 1993-10-05 Erik Van Bork Apparatus for controlling diaphragm extension in a diaphragm metering pump
DE4141670C2 (de) * 1991-12-17 1994-09-29 Ott Kg Lewa Hydraulisch angetriebene Membranpumpe mit Membranhubbegrenzung
EP0997643B1 (fr) * 1998-09-25 2006-07-12 ALLDOS Eichler GmbH Pompe doseuse à membrane
US6264432B1 (en) 1999-09-01 2001-07-24 Liquid Metronics Incorporated Method and apparatus for controlling a pump
US6350110B1 (en) * 2000-03-31 2002-02-26 B&G International Multiport metering pump
US6689503B2 (en) 2001-02-15 2004-02-10 Asia Pacific Fuel Cell Technologies, Ltd. Fuel cell with uniform compression device
TW499778B (en) 2001-04-16 2002-08-21 Asia Pacific Fuel Cell Tech Generating system for a fuel cell, and heat waste recirculating and cooling system of the generating system
TW488111B (en) 2001-04-16 2002-05-21 Asia Pacific Fuel Cell Tech Anode stream recirculation system for a fuel cell
TW533620B (en) 2001-07-24 2003-05-21 Asia Pacific Fuel Cell Tech Metal hydride hydrogen storage canister design and its manufacture
TW518797B (en) * 2001-08-14 2003-01-21 Asia Pacific Fuel Cell Tech Enhanced heat conductive device for supply device of hydrogen source, and supply device of hydrogen source having the same
CN1407644A (zh) * 2001-08-23 2003-04-02 亚太燃料电池科技股份有限公司 燃料电池的膜片泵及使用此膜片泵的阳极气体循环系统
JP4330323B2 (ja) * 2001-10-24 2009-09-16 株式会社タクミナ 往復動ポンプ
DE60325122D1 (de) * 2002-10-09 2009-01-15 Tacmina Corp Membranpumpe und Rückschlagventil
FR2895036B1 (fr) * 2005-12-20 2008-02-22 Milton Roy Europ Sa Pompe a membrane a actionnement hydraulique avec dispositif de compensation des fuites
CN101245777B (zh) * 2007-02-13 2010-09-08 米尔顿罗伊欧洲公司 具有泄漏补偿设备的液压致动隔膜泵
DE102008028772A1 (de) * 2008-06-17 2009-12-24 Hansen, Bernd, Dipl.-Ing. Vorrichtung zum Befüllen von Behältnissen
US9739274B2 (en) 2013-03-15 2017-08-22 Integrated Designs, L.P. Pump system and method having a quick change motor drive
DE102013108672A1 (de) * 2013-08-09 2015-02-12 Aker Wirth Gmbh Verdrängerpumpe
US10024311B2 (en) * 2015-08-06 2018-07-17 Caterpillar Inc. Cryogenic pump for liquefied natural gas
DE202021106223U1 (de) * 2021-11-15 2021-11-19 Feluwa Pumpen Gmbh Membrankolbenpumpe

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DE7420951U (de) * 1975-01-16 Lewa H Kg Membranpumpe
US2303597A (en) * 1940-05-09 1942-12-01 Infilco Inc Measuring pump
US2993446A (en) * 1957-06-01 1961-07-25 Pleuger Diaphragm piston pump
GB887774A (en) * 1959-06-26 1962-01-24 Charles Wilfred Simpson Improvements in and relating to diaphragm pumps
US3392674A (en) * 1966-10-28 1968-07-16 Paul W. Schlosser Pump with piston and diaphragm
DE7303301U (de) * 1973-01-30 1974-04-04 Feluwa Schlesiger & Co Kg Membran-Kolbenpumpe
US3957399A (en) * 1975-03-20 1976-05-18 Graco Inc. Diaphragm pump
FR2492473B1 (fr) * 1980-10-17 1985-06-28 Milton Roy Dosapro Pompe a membrane a compensation dans la chambre hydraulique de commande

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109458316A (zh) * 2018-09-29 2019-03-12 陕西科技大学 一种硫酸进料泵

Also Published As

Publication number Publication date
DE3560776D1 (en) 1987-11-19
DE3430721A1 (de) 1986-03-06
US4619589A (en) 1986-10-28
JPS6161990A (ja) 1986-03-29
EP0175105A1 (fr) 1986-03-26

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