EP1291524B1 - Pompe à membrane hydraulique avec membrane précontrainte - Google Patents

Pompe à membrane hydraulique avec membrane précontrainte Download PDF

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Publication number
EP1291524B1
EP1291524B1 EP02018670A EP02018670A EP1291524B1 EP 1291524 B1 EP1291524 B1 EP 1291524B1 EP 02018670 A EP02018670 A EP 02018670A EP 02018670 A EP02018670 A EP 02018670A EP 1291524 B1 EP1291524 B1 EP 1291524B1
Authority
EP
European Patent Office
Prior art keywords
diaphragm
membrane
hydraulic
pump
pump according
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
EP02018670A
Other languages
German (de)
English (en)
Other versions
EP1291524A3 (fr
EP1291524A2 (fr
Inventor
Nils Dr. Kohlhase
Waldemar Horn
Rüdiger Schnorr
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 GmbH
Lewa Herbert Ott GmbH and Co KG
Original Assignee
Lewa GmbH
Lewa Herbert Ott GmbH and Co 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 Lewa GmbH, Lewa Herbert Ott GmbH and Co KG filed Critical Lewa GmbH
Publication of EP1291524A2 publication Critical patent/EP1291524A2/fr
Publication of EP1291524A3 publication Critical patent/EP1291524A3/fr
Application granted granted Critical
Publication of EP1291524B1 publication Critical patent/EP1291524B1/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 hydraulically driven diaphragm pump with prestressed Membrane.
  • diaphragm pumps of the generic type is finally still their starting safety of great importance.
  • the diaphragm pumps in today clearly lack of safety as a disadvantage. This one is only then eliminated if additional design features are present, however additional costs. It is therefore desirable in such diaphragm pumps to have sufficient starting safety, due to which ensures that the diaphragm at standstill of the pump - due always existing internal leakage - even then not in the direction of pressure stroke moved, if there is vacuum in the pumping chamber.
  • the invention is based on the object, the diaphragm pump of the generic Art to eliminate the disadvantages described in such a way that Nevertheless, it has a high dosing accuracy with a simple structure and that their absorbency is not limited by gas formation in the hydraulic space, so that vacuuming is also possible.
  • the inventively designed diaphragm pump is the essential idea on the basis of biasing the membrane by spring force so strong that they a considerable pressure force on the hydraulic fluid in the hydraulic chamber exerts and that thus in the hydraulic chamber a significant overpressure against the delivery room is constructed.
  • the membrane is biased by spring force so strong that it also follows the piston in the suction stroke when vacuum is present in the pumping chamber, and that they are at standstill of the pump due to unavoidable internal Leakage also then not moved in the direction of pressure stroke, if in the pumping chamber vacuum is applied, while still the membrane remains in its rear dead center and is supported on a nearly gap-free surface by a part the pump body and a diaphragm coupling disk is formed, wherein no additional additional elements for membrane layer control are available.
  • the spring force is so dimensioned that the pressure in the hydraulic chamber is always at least 1 bar greater than the pressure in the pump room.
  • the embodiment can also be made in such a way that the sum of the differential pressure generated by the spring force on the Membrane and the holding pressure of a spring-loaded leak-relief valve always at least 1 bar.
  • the dimensioning can be made, for example be that the differential pressure across the membrane with at least 0.8 bar and the holding pressure of the leak-relief valve is rated at about 0.3 bar.
  • differential pressure at the membrane for example, to 0.8 bar in the rear Measuring the dead center of the diaphragm is merely a holding pressure at the leak-relief valve of 0.3 bar necessary to sum the desired total differential pressure of more than 1 bar.
  • the invention can be advantageous in design terms in various ways and realize.
  • it is possible to move the membrane in the direction the suction stroke biasing strong spring force through the membrane itself i.e. by their shape and / or material to produce.
  • a material for the membrane for example, polytetrafluoroethylene (PTFE) in question, while a suitable membrane shape, for example by a corresponding pre-deformation is formed.
  • PTFE polytetrafluoroethylene
  • the membrane biasing in the direction of the suction stroke strong Spring force by at least one built-in membrane spring element, for example a plate spring to produce.
  • a structurally particularly simple realization of the invention is based lying thought arises when the membrane in the direction of Suction stroke biasing strong spring force by a arranged in the hydraulic chamber Compression spring is generated; this can be on a connected with the membrane central guide rod on the one hand on the pump housing and on the other Support at the end of the guide rod, with respect to their strength the effective membrane area is dimensioned accordingly.
  • the membrane in adaptation to the at her adjacent differential pressure formed as a molding membrane with a circumferential bead is, whose concave side points to the hydraulic chamber. Due to the at the Diaphragm applied differential pressure is in this case the bead of the molding membrane stabilized. This results in no tendency to buckle, so that the Membrane has a long life. In addition, there is a tendency to fretting Extremely low in sandwich membranes.
  • the membrane can be used as a sandwich membrane be formed with at least two membrane layers, the individual layers mechanically are coupled and the suction stroke by the spring action of the compression spring be retrieved as a complete membrane package.
  • a membrane 1 As can be seen from Fig. 1, the illustrated, hydraulically driven diaphragm pump a membrane 1, the edge between a pump body. 2 and a pump cover 3 is clamped and a delivery chamber 4 of a Hydraulic chamber 5 separates.
  • the hydraulic drive of the membrane 1 is effected by an oscillating displacement piston 6, in the pump body 2 in a bushing 7 between the hydraulic space 5 and a reservoir 8 for the hydraulic fluid back and forth is.
  • the membrane 1 is in the illustrated embodiment as a three-layer sandwich membrane formed in the form of a molding membrane with a circumferential bead 9, the concave side of the hydraulic chamber 5 shows.
  • the individual layers of the membrane 1, not shown, are in their central Area mechanically coupled by means of corresponding discs 10, 11, the interconnected, in particular screwed, are.
  • the in the direction of the hydraulic space 5 facing disc 11 carries a central guide rod 12, the extends axially to the rear in the hydraulic chamber 5.
  • On this guide rod 12 is a strong compression spring 13 is arranged, on the one hand to a Shoulder 14 of the pump body 2 and on the other hand to the corresponding shoulder-like end of the guide rod 12 is supported. Due to the As a result of this exerted strong spring force, the membrane 1 is always in the direction of her Suction strokes, i. their rear dead center, biased.
  • Compression spring 13 dimensioned such that the hydraulic fluid located in the hydraulic chamber 5 a considerable pressure force is exerted, so that thus in the hydraulic chamber 5 a substantial pressure over the delivery chamber 4 constructed is.
  • This significant overpressure in the hydraulic chamber 5 is hereby shown Embodiment always at least 1 bar greater than the pressure in the delivery chamber 4th
  • the diagram according to FIG. 2 schematically shows the differential pressure on the membrane Plotted over the stroke of the front dead center VT to the rear dead center HT,
  • the differential pressure on the membrane alone due to the previously described spring 13 is generated.
  • the spring 13 also generates in rear dead center HT of the diaphragm a differential pressure of at least 1 bar, so that thus in the hydraulic chamber 5 is always a significant overpressure against the delivery chamber 4 is constructed.
  • the differential pressure at the diaphragm 1 pressure in the hydraulic oil
  • the differential pressure is generated by spring force.
  • the effective holding pressure of the leak-relief valve 15 shown as the sum of the differential pressure at the diaphragm 1 and the holding pressure of the leak-relief valve 15 (see Fig. 1). It is always at least 1 bar.
  • the embodiment For example, be made such that the differential pressure at the Membrane 1 is at least 0.8 bar and that the holding pressure of the leak-relief valve 15 with about 0.3 bar is measured.
  • the effective holding pressure is then at the rear dead center HT of the membrane 1 at least 1.1 bar.
  • Pressure in the hydraulic oil then drops to 0.7 bar absolute or to a negative pressure of 0.3 bar.
  • Fig. 4 shows the membrane 1 in its hydraulic side installation, i. in her back Dead center HT.
  • the embodiment is made such that the pump body 2 together with the rear diaphragm coupling disk 11 a nearly gap-free surface for supporting the membrane 1 forms. This allows the membrane stand at standstill differential pressures of up to 400 bar without them Harm suffers.
  • the illustrated membrane 1 ' is designed as a wave membrane, this has a due to their design Such inherent rigidity, that this the function of the compression spring described above 13 fulfilled and for applying the desired spring force on the membrane 1 ' can be used.
  • the dashed lines illustrate the work area such a wave membrane 1 '.
  • the illustrated Membrane 1 integrated disc springs 16. These may, for example, in an elastomeric membrane vulcanised and also fulfill the function to that they the membrane in the direction of its suction stroke with a strong spring force Pretension. Again, the dashed lines illustrate the work area such a membrane 1 ".
  • FIG. 7 schematically illustrates the usable working area of one of the previously described membranes 1 'and 1 ".

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

Claims (10)

  1. Pompe à membrane à entraínement hydraulique comportant une membrane serrée du côté bord entre un corps de pompe (2) et un couvercle de pompe (3) et séparant une chambre de refoulement (4) vis-à-vis d'une chambre hydraulique (5) et précontrainte en direction de sa course d'aspiration par la force d'un ressort, et comportant un entraínement hydraulique de membrane sous la forme d'un piston déplaceur (6) oscillant qui est mobile en translation dans le corps de pompe (2) entre un réservoir (8) pour le liquide hydraulique et la chambre hydraulique (5), la membrane (1) étant précontrainte par la force du ressort aussi fortement qu'elle suit le piston (6) lors de la course d'aspiration même lorsqu'un vide s'applique dans la chambre de refoulement (4) et qu'elle ne se déplace pas en direction de la course de compression à cause de fuites internes inévitables à l'arrêt de la pompe, même lorsqu'un vide s'applique dans la chambre de refoulement (4), et de plus la membrane (1) demeure dans sa position de point mort arrière et prend appui contre une surface pratiquement exempte de fente et formée par une partie du corps de pompe (2) et par un disque de couplage de membrane (11), aucun autre élément supplémentaire n'étant prévu pour commander la position de la membrane.
  2. Pompe à membrane selon la revendication 1, caractérisée en ce que la force du ressort est ainsi dimensionnée que la pression dans la chambre hydraulique (5) est en permanence supérieure d'au moins 1 bar à la pression dans la chambre de refoulement (4).
  3. Pompe à membrane selon l'une ou l'autre des revendications 1 et 2, caractérisée en ce que la force du ressort est ainsi dimensionnée que dans la chambre hydraulique (5), pendant la course d'aspiration, une dépression ne règne à aucun instant jusqu'à ce que la membrane (1) vienne prendre appui mécaniquement contre le corps de pompe (2).
  4. Pompe à membrane selon la revendication 1, caractérisée en ce que la somme de la pression différentielle, générée par la force du ressort, au niveau de la membrane (1) et de la pression de maintien d'une valve de complément de fuite (15) pourvue d'un ressort est en permanence d'au moins 1 bar.
  5. Pompe à membrane selon la revendication 4, caractérisée en ce que la pression différentielle au niveau de la membrane (1) est d'au moins 0,8 bar et la pression de maintien de la valve de complément de fuite (15) est d'environ 0,3 bar.
  6. Pompe à membrane selon l'une des revendications précédentes, caractérisée en ce que la force de ressort élevée qui met sous précontrainte la membrane (1) en direction de la course d'aspiration est générée par la membrane (1) elle-même, c'est-à-dire par sa forme et/ou par son matériau.
  7. Pompe à membrane selon l'une des revendications 1 à 5, caractérisée en ce que la force de ressort élevée qui met sous précontrainte la membrane (1") en direction de la course d'aspiration est générée par au moins un élément ressort intégré dans la membrane (1), par exemple un ressort Belleville (16).
  8. Pompe à membrane selon l'une des revendications 1 à 5, caractérisée en ce que la force de ressort élevée qui met sous précontrainte la membrane (1) en direction de la course d'aspiration est générée par un ressort de compression (13) agencé dans la chambre hydraulique (5), ressort qui prend appui d'une part contre le corps de pompe (2) sur une barre de guidage centrale (12) reliée à la membrane (1) et d'autre part contre l'extrémité de la barre de guidage (12) et dont l'intensité est dimensionnée en correspondance par rapport à la surface active de la membrane.
  9. Pompe à membrane selon l'une des revendications précédentes, caractérisée en ce que la membrane (1) est réalisée sous la forme d'une membrane moulée comportant une moulure périphérique (9) dont le côté concave est dirigé vers la chambre hydraulique (5).
  10. Pompe à membrane selon l'une des revendications précédentes, caractérisée en ce que la membrane (1) est réalisée sous la forme d'une membrane en sandwich comportant au moins deux couches de membrane dont les couches individuelles sont couplées mécaniquement et susceptibles d'être rappelées sous forme d'ensemble membrane complet lors de la course d'aspiration par l'effet élastique du ressort de compression (13).
EP02018670A 2001-09-07 2002-08-20 Pompe à membrane hydraulique avec membrane précontrainte Expired - Lifetime EP1291524B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10143978 2001-09-07
DE10143978A DE10143978B4 (de) 2001-09-07 2001-09-07 Hydraulisch angetriebene Membranpumpe mit vorgespannter Membran

Publications (3)

Publication Number Publication Date
EP1291524A2 EP1291524A2 (fr) 2003-03-12
EP1291524A3 EP1291524A3 (fr) 2004-07-28
EP1291524B1 true EP1291524B1 (fr) 2005-11-30

Family

ID=7698108

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02018670A Expired - Lifetime EP1291524B1 (fr) 2001-09-07 2002-08-20 Pompe à membrane hydraulique avec membrane précontrainte

Country Status (5)

Country Link
US (1) US6884045B2 (fr)
EP (1) EP1291524B1 (fr)
JP (1) JP4416149B2 (fr)
AT (1) ATE311536T1 (fr)
DE (2) DE10143978B4 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10322221B3 (de) * 2003-05-16 2005-01-27 Lewa Herbert Ott Gmbh + Co Leckageüberwachung im Hydraulikdruckraum einer Membranpumpe
NO20045382D0 (no) * 2004-12-09 2004-12-09 Clavis Impuls Technlogy As Fremgangsmate og anordning for transport av fluid i en kanal
US20080003120A1 (en) * 2006-06-30 2008-01-03 Meza Humberto V Pump apparatus and method
FR2941749A1 (fr) * 2009-02-03 2010-08-06 Milton Roy Europe Pompe a membrane elastique a commande hydraulique
DE102010004600A1 (de) 2010-01-13 2011-07-14 Marseille, Oliver, Dr.-Ing., 52066 Anordnung mit einer Blutpumpe und einem Gasaustauscher zur extrakorporalen Membranoxygenierung
DE102010039831B4 (de) 2010-08-26 2022-02-03 Prominent Gmbh Membranpumpe sowie Verfahren zum Einstellen einer solchen
DE102014010108B4 (de) 2014-07-08 2016-01-28 Lewa Gmbh Hydraulisch angetriebene Membranpumpe
ITUB20151971A1 (it) * 2015-07-06 2017-01-06 Seko Spa Pompa a membrana
JP7346445B2 (ja) * 2018-04-18 2023-09-19 ワナー・エンジニアリング・インコーポレーテッド ダイヤフラムポンプを圧力差から保護するためのデバイス

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB339136A (en) * 1929-01-12 1930-12-04 Barostat Company Improvements in and relating to diaphragm devices operated by fluid pressure
US2546302A (en) * 1946-06-04 1951-03-27 Cooper Bessemer Corp Flexible diaphragm pump
US2642090A (en) * 1946-11-16 1953-06-16 Niles Bement Pond Co Diaphragm assembly and method of making same
US2653552A (en) * 1951-08-15 1953-09-29 Geeraert Corp High-pressure pump
DE1034030B (de) * 1955-09-22 1958-07-10 Reiners Walter Dr Ing Membranpumpe fuer nicht schmierende und chemisch aggressive Fluessigkeiten, insbesondere zur Schaedlingsbekaempfung in der Landwirtschaft
US3075468A (en) * 1960-04-06 1963-01-29 Hills Mccanna Co Hydraulically actuated diaphragm pump
US3386388A (en) * 1966-06-22 1968-06-04 Rosenberg David Hydraulically actuated pump
US4022114A (en) * 1974-07-05 1977-05-10 Refrigerating Specialties Company Flexible diaphragm construction
HU168667B (fr) * 1975-02-25 1976-06-28
DE3631982C1 (de) * 1986-09-19 1988-02-04 Hans Ing Kern Dosierpumpe
JPH0314930A (ja) * 1989-02-28 1991-01-23 Tatsuta Electric Wire & Cable Co Ltd 皿ばね
DE3943585C2 (de) * 1989-08-31 1995-04-27 Wagner Gmbh J Membranpumpe
US6086340A (en) * 1999-05-11 2000-07-11 Milton Roy Company Metering diaphragm pump having a front removable hydraulic refill valve
US6276907B1 (en) * 1999-08-12 2001-08-21 Wagner Spray Tech Corporation Hydraulically driven diaphragm pump

Also Published As

Publication number Publication date
DE50205092D1 (de) 2006-01-05
ATE311536T1 (de) 2005-12-15
US20030049145A1 (en) 2003-03-13
EP1291524A3 (fr) 2004-07-28
JP2003097449A (ja) 2003-04-03
DE10143978B4 (de) 2005-03-03
DE10143978A1 (de) 2003-03-27
JP4416149B2 (ja) 2010-02-17
US6884045B2 (en) 2005-04-26
EP1291524A2 (fr) 2003-03-12

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