EP1291524B1 - Hydraulisch angetriebene Membranpumpe mit vorgespannter Membran - Google Patents
Hydraulisch angetriebene Membranpumpe mit vorgespannter Membran Download PDFInfo
- 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
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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 ".
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Description
- Die Saugfähigkeit der Pumpe wird nicht durch eine unerwünschte Gasbildung im Hydraulikraum begrenzt, so daß auch das Ansaugen aus Vakuum sehr gut möglich ist. Damit entspricht die Saugfähigkeit der erfindungsgemäßen Membranpumpe derjenigen einer Kolbenpumpe.
- Die erfindungsgemäße Membranpumpe weist eine hohe Dosiergenauigkeit auf, da durch den im Hydraulikraum herrschenden, erfindungsgemäß vorgesehenen Überdruck jegliche Gasbildung unterbunden wird.
- Aufgrund der erfindungsgemäßen Ausgestaltung der Hydraulikpumpe kann diese mit einem lediglich einfachen Leckergänzungsventil versehen werden, das nur eine sehr schwache oder sogar gar keine Feder aufweist, so daß während des Leckergänzungsvorgangs kaum Gasbildung auftritt.
- Aufgrund der stark verringerten bzw. vollkommen unterbundenen Gasbildung ergibt sich eine sehr vereinfachte Gasaustragung aus dem Hydraulikraum, so daß auch keine kontinuierliche Gasaustragung erforderlich ist.
- Die erfindungsgemäße Membranpumpe weist insgesamt einen einfachen Aufbau auf, so daß zur Membranlagensteuerung keine zusätzlichen Elemente erforderlich sind.
- Die Drehzahl des Antriebs der Pumpe wird nicht durch eine Gasbildung im Hydraulikraum begrenzt, so daß hohe Drehzahlen möglich sind.
- Aufgrund des im Hydraulikraum herrschenden Überdrucks wird verhindert, daß sich die Membran im Stillstand der Pumpe nach vorn in Richtung ihres Druckhubes bewegt, auch wenn im Förderraum Vakuum anliegt.
- Aufgrund des im Hydraulikraum herrschenden Überdrucks ist die Membran immer in Richtung des Förderraums ausgewölbt, d.h. vorgewölbt, so daß sie in ihrer Form stabilisiert ist.
- Fig. 1
- schematisch im Längsschnitt die erfindungsgemäße Membranpumpe;
- Fig. 2
- im Diagramm den allein aufgrund Federkraft erzeugten Differenzdruck an der Membran über deren Hubweg;
- Fig. 3
- gleichfalls im Diagramm den Druck im Hydrauliköl bei Vakuumbedingungen auf der Saugseite, wobei die Federkraft so bemessen ist, daß ein Differenzdruck von mindestens 0,8 bar entsteht bei einem Haltedruck des Leckergänzungsventils von 0,3 bar;
- Fig. 4
- im Detail schematisch im Schnitt die Membran in ihrer hinteren Totpunktlage, in der sie an einer aus Pumpenkörper und Membrankopplungsscheibe gebildeten nahezu spaltfreien Fläche abgestützt ist;
- Fig. 5
- die Ausbildung der Membran als Wellenmembran, deren Eigensteifigkeit zum Erzeugen einer Federkraft genutzt ist;
- Fig. 6
- die Ausbildung einer Membran mit einer integrierten Tellerfeder zum Erzeugen der gewünschten Federkraft und
- Fig. 7
- schematisch im Diagramm den nutzbaren Arbeitsbereich einer Membran, die entweder als Wellenmembran gemäß Fig. 5 oder als Membran mit integrierter Tellerfeder gemäß Fig. 6 ausgebildet ist.
Claims (10)
- Hydraulisch angetriebene Membranpumpe mit einer randseitig zwischen einem Pumpenkörper (2) und einem Pumpendeckel (3) eingespannten Membran, die einen Förderraum (4) von einem Hydraulikraum (5) trennt sowie in Richtung ihres Saughubes durch Federkraft vorgespannt ist, und mit einem hydraulischen Membranantrieb in Form eines oszillierenden Verdrängerkolbens (6), der im Pumpenkörper (2) zwischen einem Vorratsraum (8) für die Hydraulikflüssigkeit und dem Hydraulikraum (5) verschiebbar ist, wobei die Membran (1) mittels Federkraft so stark vorgespannt ist, dass sie im Saughub dem Kolben (6) auch dann folgt, wenn im Förderraum (4) Vakuum anliegt, und dass sie sich im Stillstand der Pumpe infolge unvermeidbarer interner Leckage auch dann nicht in Richtung Druckhub bewegt, wenn im Förderraum (4) Vakuum anliegt, wobei weiterhin die Membran (1) in ihrer hinteren Totpunktlage verbleibt und sich an einer nahezu spaltfreien Fläche abstützt, die durch einen Teil des Pumpenkörpers (2) und eine Membrankopplungsscheibe (11) gebildet ist, wobei keine weiteren zusätzlichen Elemente zur Membranlagensteuerung vorhanden sind.
- Membranpumpe nach Anspruch 1, dadurch gekennzeichnet, daß die Federkraft so bemessen ist, daß der Druck im Hydraulikraum (5) stets wenigstens 1 bar größer ist als der Druck im Förderraum (4).
- Membranpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Federkraft so bemessen ist, daß im Hydraulikraum (5) während des Saughubes zu keinem Zeitpunkt Unterdruck herrscht, bis sich die Membran (1) mechanisch am Pumpenkörper (2) abstützt.
- Membranpumpe nach Anspruch 1, dadurch gekennzeichnet, daß die Summe aus dem von der Federkraft erzeugten Differenzdruck an der Membran (1) und dem Haltedruck eines befederten Leckergänzungsventils (15) stets wenigstens 1 bar beträgt.
- Membranpumpe nach Anspruch 4, dadurch gekennzeichnet, daß der Differenzdruck an der Membran (1) mit mindestens 0,8 bar und der Haltedruck des Leckergänzungsventils (15) mit ca. 0,3 bar bemessen ist.
- Membranpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die die Membran (1) in Richtung des Saughubes vorspannende starke Federkraft durch die Membran (1) selbst, d.h. durch deren Form und/oder deren Material, erzeugt ist.
- Membranpumpe nach einem der Ansprüche 1 - 5, dadurch gekennzeichnet, daß die die Membran (1") in Richtung des Saughubes vorspannende starke Federkraft durch wenigstens ein in die Membran (1) eingebautes Federelement, beispielsweise eine Tellerfeder (16), erzeugt ist.
- Membranpumpe nach einem der Ansprüche 1 - 5, dadurch gekennzeichnet, daß die die Membran (1) in Richtung des Saughubes vorspannende starke Federkraft durch eine im Hydraulikraum (5) angeordnete Druckfeder (13) erzeugt ist, die sich auf einer mit der Membran (1) verbundenen zentralen Führungsstange (12) einerseits am Pumpenkörper (2) sowie andererseits am Ende der Führungsstange (12) abstützt und deren Stärke in bezug auf die wirksame Membranfläche entsprechend bemessen ist.
- Membranpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Membran (1) als Formmembran mit einer umlaufenden Sicke (9) ausgebildet ist, deren konkave Seite zum Hydraulikraum (5) zeigt.
- Membranpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Membran (1) als Sandwichmembran mit wenigstens zwei Membranlagen ausgebildet ist, deren einzelne Lagen mechanisch gekoppelt und beim Saughub durch die Federwirkung der Druckfeder (13) als komplettes Membranpaket zurückholbar sind.
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 (de) | 2003-03-12 |
EP1291524A3 EP1291524A3 (de) | 2004-07-28 |
EP1291524B1 true EP1291524B1 (de) | 2005-11-30 |
Family
ID=7698108
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02018670A Expired - Lifetime EP1291524B1 (de) | 2001-09-07 | 2002-08-20 | Hydraulisch angetriebene Membranpumpe mit vorgespannter Membran |
Country Status (5)
Country | Link |
---|---|
US (1) | US6884045B2 (de) |
EP (1) | EP1291524B1 (de) |
JP (1) | JP4416149B2 (de) |
AT (1) | ATE311536T1 (de) |
DE (2) | DE10143978B4 (de) |
Families Citing this family (9)
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 |
KR20210003177A (ko) | 2018-04-18 | 2021-01-11 | 워너 엔지니어링 인코포레이티드 | 차압으로부터 다이어프램 펌프를 보호하기 위한 장치 |
Family Cites Families (14)
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 (de) * | 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 |
-
2001
- 2001-09-07 DE DE10143978A patent/DE10143978B4/de not_active Expired - Fee Related
-
2002
- 2002-08-20 AT AT02018670T patent/ATE311536T1/de not_active IP Right Cessation
- 2002-08-20 DE DE50205092T patent/DE50205092D1/de not_active Expired - Lifetime
- 2002-08-20 EP EP02018670A patent/EP1291524B1/de not_active Expired - Lifetime
- 2002-09-04 US US10/233,542 patent/US6884045B2/en not_active Expired - Lifetime
- 2002-09-06 JP JP2002261690A patent/JP4416149B2/ja not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US20030049145A1 (en) | 2003-03-13 |
DE10143978B4 (de) | 2005-03-03 |
DE50205092D1 (de) | 2006-01-05 |
JP2003097449A (ja) | 2003-04-03 |
JP4416149B2 (ja) | 2010-02-17 |
EP1291524A3 (de) | 2004-07-28 |
DE10143978A1 (de) | 2003-03-27 |
ATE311536T1 (de) | 2005-12-15 |
EP1291524A2 (de) | 2003-03-12 |
US6884045B2 (en) | 2005-04-26 |
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