EP0922164B1 - Diaphragm pump - Google Patents
Diaphragm pump Download PDFInfo
- Publication number
- EP0922164B1 EP0922164B1 EP97933693A EP97933693A EP0922164B1 EP 0922164 B1 EP0922164 B1 EP 0922164B1 EP 97933693 A EP97933693 A EP 97933693A EP 97933693 A EP97933693 A EP 97933693A EP 0922164 B1 EP0922164 B1 EP 0922164B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- connecting rod
- diaphragm
- membrane
- fastening
- diaphragm pump
- 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
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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
- 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
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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
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/0009—Special features
- F04B43/0054—Special features particularities of the flexible members
Definitions
- the invention relates to a diaphragm pump with a connecting rod having crank drive and one connected to the connecting rod elastic membrane, which membrane at their compression space facing back at least one undercut Fastening opening for inserting the complementary shaped Fastening end of the connecting rod, wherein the connecting rod a support surface to the underside of its fastening end Support of the central one, which has a contact surface Has membrane area and the supporting surface of the connecting rod at least one protruding approximately in the axial direction of the connecting rod Fastening projection for positive engagement in at least one central opening Membrane area is provided.
- Diaphragm pumps are also used, for example, as micromembrane pumps used in portable analyzers. Because these analyzers and their micromembrane pumps mostly independent of the power grid Motors or batteries are operated for this purpose a low power consumption is required. Such engines have however only a low performance, which is why the Flexing work of the membrane during the operation of these previously known Micro diaphragm pumps is to be reduced. With such weak Motors, the membrane must therefore be made sufficiently thin, but should - especially with analyzers - again be very tight so as not to increase the accuracy of these devices affect.
- Micro diaphragm pumps are already known, their diaphragm between a metallic pressure disc facing the compression chamber and the connecting rod head is clamped, the thrust washer on Connecting rod head is fastened by means of a screw connection, which penetrates a central fastening opening of the membrane.
- pressure plate clamping has a central one inelastic area of the membrane resulting in the Stroke volume reduced and the performance of the known Micro diaphragm pump is restricted.
- a micro diaphragm pump has therefore also been created in which the clamped with its peripheral edge area in the pump head Diaphragm a connecting rod head approximately T-shaped in cross section encloses positively. Through this positive connection The diaphragm on the connecting rod head can be attached to the pressure plate clamp mentioned above the membrane can be dispensed with.
- This previously known Micro diaphragm pump has a larger stroke volume because of the diaphragm is also elastic in its central area. During operation The membrane of the known micromembrane pump moves on the connecting rod head enclosed by her, what with an additional flexing work of the membrane is connected.
- a diaphragm pump is already known from DE 33 11 104 A1 known type, the membrane of which the Compression chamber facing away from the underside of an undercut Has mounting opening.
- This mounting hole is with the complementary shaped end of a connecting rod connected.
- a Fastening projection provided in the fastening opening is molded.
- the fastening projection is above a Fastening end of the connecting rod in front of the support surface for supporting a central support surface on the underside having membrane area is used.
- the achievement of this task consists in the Diaphragm pump of the type mentioned at the outset, in particular in that at least one cone-shaped on the underside of the membrane Insert part is provided, and that the insert part in Mounting position on the one fastening projection or several connecting tabs of the connecting rod are on the side.
- the connecting rod has one Support surface, which is a central, a support surface having membrane area supports. Because of her Membrane underside supported, this can become during of the business do not move back and forth on the connecting rod, which unwanted additional flexing work of the membrane is avoided. In particular, a larger support ring also exercises influence the possible delivery capacity of the membrane, because this is especially the case with a larger diameter of the support ring creates a larger piston-like zone that does not deform during the up and down stroke and thus leads to a larger stroke volume.
- This configuration of the Membrane allows a relatively small, fixed diameter of the connecting rod, so that there are relatively large elastic zones form the too low voltages in the membrane and this leads to a larger stroke in relation to the effective diameter of the membrane.
- the membrane is therefore characterized by better membrane expansion ratios and their always constant perfect fit. Since the membrane of the invention Diaphragm pump no longer has a central fastening opening required, this membrane is on the connecting rod attachment in the In contrast to the known pressure plate clamping, it is very tight.
- the provided according to the invention and preferably on one annular fastening projection or at least three, approximately evenly spaced fastening projections adjacent, peg-shaped insert part of the invention The membrane takes over the centering and guiding of the membrane during the swinging movements. At the same time, this takes on cone-shaped Insert the radial and axial guidance of the membrane opposite the connecting rod. This makes the membrane so precise the connecting rod fixes that both radial and axial forces not change them from their position in relation to the connecting rod.
- an embodiment is preferred in which an annular fastening projection arranged on a circle concentric with the connecting rod longitudinal axis is provided with a rear engagement edge projecting laterally like a hook on its free edge region.
- a fastening projection on the connecting rod favors the good centering and guiding of the membrane during its swinging movements; at the same time, the membrane is particularly precisely fixed on the connecting rod.
- several, preferably at least three, fastening projections arranged on a circle concentric with the connecting rod longitudinal axis are provided.
- a particularly advantageous embodiment according to the invention provides that the one located at the end of the connecting rod Support surface for supporting the central one on the underside Contact area having membrane area, approximately radial has over the cross-section of the connecting rod protruding support collar and that the central contact surface of the membrane accordingly this enlarged support surface are dimensioned.
- the appropriately dimensioned membrane transmits via its central Contact surface some of the compressive forces on the approximately radial Support collar protruding over the cross-section of the connecting rod.
- a central centering projection for engaging in a counter recess in the membrane is provided.
- the diaphragm pump according to the invention as a micro diaphragm pump is trained.
- the single figure shows the crank drive 1 and one with a Connecting rod 2 of the crank drive 1 connected membrane 3 one Diaphragm pump in a schematic representation.
- the connecting rod 2 of the crank drive 1 is connected to the membrane 3 in such a way that the membrane 3 on the connecting rod 2 during operation of the Diaphragm pump is moved back and forth.
- the connecting rod 2 has on its membrane 3 facing Fastening end of a support surface 4 for underside support of the central membrane area having a support surface 5.
- A stands above the support surface 4 of the connecting rod 2 ring-shaped arranged concentrically to the connecting rod longitudinal axis Fastening projection 6 in front of the free edge area a rear gripping edge projecting laterally outwards like a hook 7 has.
- the connecting rod in the axial direction 2 protruding fastening projection 6 engages in a form-fitting manner trained as an annular groove and in their clear cross-section correspondingly hook-shaped fastening opening 8 on the underside of the membrane.
- This annular mounting opening 8 is limited to the Membrane underside a peg-shaped insert 9, which in the single figure on the inner peripheral edge of the annular Fastening projection 6 is present.
- the support surface 4 provided on the connecting rod 2 supports the central the contact area 5 having membrane area of the membrane 3 from. Through the membrane supported on the underside of the membrane 3, this can occur during the operation of the diaphragm pump Do not move the connecting rods back and forth, creating an undesirable additional flexing work of the membrane 3 is avoided.
- a larger support surface also exercises one Influence on the possible delivery capacity of the membrane 3, because this is especially the case with a larger diameter the support surface 4 creates a larger piston-like zone that does not deform during the up and down stroke and thus leads to a larger stroke volume.
- this allows Construction a relatively small fixed diameter of the connecting rod 2, so that relatively large elastic zones are formed, the too low tensions in the membrane 3 and this leads to a larger stroke in relation to the effective diameter of the membrane 3.
- the membrane 3 is therefore characterized better membrane expansion ratios and their always constant perfect fit. Because the membrane 3 of here shown diaphragm pump no central mounting opening has more, this membrane 3 is on the connecting rod attachment in the In contrast to the known pressure plate clamping, it is very tight.
- the peg-shaped insert 9 takes over during the swinging movements centering and guiding the membrane. there the central insert 9 also favors the radial and axial guidance of the diaphragm 3 relative to the connecting rod 2.
- a central centering projection 11 may also be provided, which engages in a counter recess of the membrane 3.
- the compression chamber of the pump facing side of the membrane 3 free of fasteners be designed. To ensure a high level of tightness at the To achieve connecting rod attachment, it is advantageous if the Membrane closed continuously towards the compression chamber is trained.
- the membrane 3 is thus characterized by a high level of tightness on the connecting rod attachment.
- the membrane can both as a flat as well as a structural or a shaped membrane be trained.
- By designing the membrane 3 as Formed membranes can create smaller harmful spaces and therefore higher ones Compression ratios can be achieved.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Description
Die Erfindung betrifft eine Membranpumpe mit einem einen Pleuel aufweisenden Kurbelantrieb und einer mit dem Pleuel verbundenen elastischen Membrane, welche Membrane an ihrer dem Verdichtungsraum abgewandten Rückseite wenigstens eine hinterschnittene Befestigungsöffnung zum Einsetzen des komplementär geformten Befestigungsendes des Pleuels aufweist, wobei das Pleuel an seinem Befestigungsende eine Stützfläche zur unterseitigen Abstützung des zentralen, eine Auflagefläche aufweisenden Membranbereiches hat und wobei die Stützfläche des Pleuels zumindest ein etwa in axialer Richtung des Pleuels vorstehender Befestigungsvorsprung zum formschlüssigen Eingreifen in wenigstens eine Befestigungsöffnung aufweisenden, zentralen Membranbereich vorgesehen ist.The invention relates to a diaphragm pump with a connecting rod having crank drive and one connected to the connecting rod elastic membrane, which membrane at their compression space facing back at least one undercut Fastening opening for inserting the complementary shaped Fastening end of the connecting rod, wherein the connecting rod a support surface to the underside of its fastening end Support of the central one, which has a contact surface Has membrane area and the supporting surface of the connecting rod at least one protruding approximately in the axial direction of the connecting rod Fastening projection for positive engagement in at least one central opening Membrane area is provided.
Membranpumpen werden beispielsweise auch als Mikromembranpumpen bei tragbaren Analysegeräten verwendet. Da diese Analysegeräte und ihre Mikromembranpumpen meist unabhängig vom Stromnetz über Batterie oder Akku betrieben werden, sind hierfür Motoren mit einer geringen Stromaufnahme erforderlich. Solche Motoren haben jedoch nur eine geringe Leistungsfähigkeit, weshalb die Walkarbeit der Membran während des Betriebes dieser vorbekannten Mikromembranpumpen zu reduzieren ist. Bei derart schwachen Motoren ist daher auch die Membran ausreichend dünn auszugestalten, soll aber - insbesondere bei Analysegeräten - wieder sehr dicht sein, um die Genauigkeit dieser Geräte nicht zu beeinträchtigen.Diaphragm pumps are also used, for example, as micromembrane pumps used in portable analyzers. Because these analyzers and their micromembrane pumps mostly independent of the power grid Motors or batteries are operated for this purpose a low power consumption is required. Such engines have however only a low performance, which is why the Flexing work of the membrane during the operation of these previously known Micro diaphragm pumps is to be reduced. With such weak Motors, the membrane must therefore be made sufficiently thin, but should - especially with analyzers - again be very tight so as not to increase the accuracy of these devices affect.
Man kennt bereits Mikromembranpumpen, deren Membran zwischen einer dem Verdichtungsraum zugewandten metallischen Druckscheibe und dem Pleuelkopf eingespannt ist, wobei die Druckscheibe am Pleuelkopf mittels einer Schraubverbindung befestigt ist, welche eine zentrale Befestigungsöffnung der Membran durchsetzt. Eine solche Druckscheibenklemmung hat jedoch einen zentralen unelastischen Bereich der Membran zur Folge, wodurch das Hubvolumen reduziert und die Leistung der vorbekannten Mikromembranpumpe eingeschränkt wird.Micro diaphragm pumps are already known, their diaphragm between a metallic pressure disc facing the compression chamber and the connecting rod head is clamped, the thrust washer on Connecting rod head is fastened by means of a screw connection, which penetrates a central fastening opening of the membrane. A however, such pressure plate clamping has a central one inelastic area of the membrane resulting in the Stroke volume reduced and the performance of the known Micro diaphragm pump is restricted.
Man hat daher auch eine Mikromembranpumpe geschaffen, bei der die mit ihrem Umfangsrandbereich im Pumpenkopf eingespannte Membran einen im Querschnitt etwa T-förmigen Pleuelkopf formschlüssig umschließt. Durch diese formschlüssige Verbindung der Membran am Pleuelkopf kann auf die vorerwähnte Druckscheibenklemmung der Membran verzichtet werden. Diese vorbekannte Mikromembranpumpe hat ein größeres Hubvolumen, da die Membran auch in ihrem Zentralbereich elastisch ist. Während des Betriebes der vorbekannten Mikromembranpumpe bewegt sich die Membran aber auf dem von ihr umschlossenen Pleuelkopf hin und her, was mit einer zusätzlichen Walkarbeit der Membran verbunden ist.A micro diaphragm pump has therefore also been created in which the clamped with its peripheral edge area in the pump head Diaphragm a connecting rod head approximately T-shaped in cross section encloses positively. Through this positive connection The diaphragm on the connecting rod head can be attached to the pressure plate clamp mentioned above the membrane can be dispensed with. This previously known Micro diaphragm pump has a larger stroke volume because of the diaphragm is also elastic in its central area. During operation The membrane of the known micromembrane pump moves on the connecting rod head enclosed by her, what with an additional flexing work of the membrane is connected.
Aus der DE 33 11 104 A1 ist bereits eine Membranpumpe der eingangs erwähnten Art bekannt, deren Membran an der dem Verdichtungsraum abgewandten Membran-Unterseite eine hinterschnittene Befestigungsöffnung hat. Diese Befestigungsöffnung ist mit dem komplementär geformten Befestigungsende eines Pleuels verbunden. Am Befestigungsende des Pleuels ist dazu ein Befestigungsvorsprung vorgesehen, der in die Befestigungsöffnung eingeformt ist. Der Befestigungsvorsprung steht über eine am Befestigungsende des Pleuels befindliche Stützfläche vor, die zur unterseitigen Abstützung eines zentralen, eine Auflagefläche aufweisenden Membranbereiches dient. Da der Befestigungsvorsprung in die Membrane einvulkanisiert ist und da die Membran dieser vorbekannten Membranpumpe einen zum Zentrum zunehmend verdickten Zentralbereich hat, ist die somit allein in ihrer äußeren Ringzone flexibel ausgestaltete Membran nur mit einer entsprechend hohen Walkarbeit zu verformen. Eine solche Membrane ist daher vor allem in größeren Membranpumpen mit einem leistungsstarken Pumpenantrieb vorteilhaft einsetzbar, aber weniger gut für Mikromembranpumpen geeignet, deren Motoren nur eine geringe Leistungsfähigkeit haben.A diaphragm pump is already known from DE 33 11 104 A1 known type, the membrane of which the Compression chamber facing away from the underside of an undercut Has mounting opening. This mounting hole is with the complementary shaped end of a connecting rod connected. At the end of the connecting rod there is a Fastening projection provided in the fastening opening is molded. The fastening projection is above a Fastening end of the connecting rod in front of the support surface for supporting a central support surface on the underside having membrane area is used. Because the mounting tab is vulcanized into the membrane and since the membrane of this previously known diaphragm pump increasingly thickened towards the center Central area, it is therefore only in its outer Ring zone flexibly designed membrane only with a corresponding to deform high flexing work. Such a membrane is therefore especially in larger diaphragm pumps with one powerful pump drive can be used advantageously, however less well suited for micro diaphragm pumps whose motors only have poor performance.
Es besteht daher insbesondere die Aufgabe, eine Membranpumpe der eingangs erwähnten Art zu schaffen, deren Membran auf einfache Weise und dennoch so präzise am Pleuelkopf befestigt werden kann, daß während des Betriebes keine zusätzliche Walkarbeit auftritt.There is therefore in particular the task of a diaphragm pump to create the type mentioned, the membrane on simple and yet so precisely attached to the connecting rod head can be that no additional during operation Flexing occurs.
Die erfindungsgemäße Lösung dieser Aufgabe besteht bei der Membranpumpe der eingangs erwähnten Art insbesondere darin, daß an der Membranunterseite wenigstens ein zapfenförmiges Einsatzteil vorgesehen ist, und daß das Einsatzteil in Montagestellung an dem einen Befestigungsvorsprung oder an mehreren Befestigungsvorsprüngen des Pleuels seitlich anliegt.The achievement of this task consists in the Diaphragm pump of the type mentioned at the outset, in particular in that at least one cone-shaped on the underside of the membrane Insert part is provided, and that the insert part in Mounting position on the one fastening projection or several connecting tabs of the connecting rod are on the side.
Bei der erfindungsgemäßen Membranpumpe hat das Pleuel eine Stützfläche, welche einen zentralen, eine Auflagefläche aufweisenden Membranbereich abstützt. Durch die an ihrer Membranunterseite abgestützte Membran kann diese sich während des Betriebes nicht am Pleuel hin- und herbewegen, wodurch eine unerwünschte zusätzliche Walkarbeit der Membran vermieden wird. Insbesondere ein größer dimensionierter Stützring übt zudem einen Einfluß auf die mögliche Förderleistung der Membrane aus, weil diese nämlich insbesondere bei einem größeren Durchmesser des Stützringes eine größere kolbenartige Zone schafft, die sich während des Auf- und Abwärtshubes nicht verformt und somit zu einem größeren Hubvolumen führt. Diese Ausgestaltung der Membran gestattet einen relativ kleinen, festen Durchmesser des Pleuels, so daß sich verhältnismäßig große elastische Zonen herausbilden, die zu niedrigen Spannungen in der Membran und dadurch zu einem größeren Hub im Verhältnis zum Wirkdurchmesser der Membrane führen. Die Membrane zeichnet sich daher durch bessere Membrandehnungsverhältnisse und ihren stets gleichbleibend einwandfreien Sitz aus. Da die Membrane der erfindungsgemäßen Membranpumpe keine zentrale Befestigungsöffnung mehr benötigt, ist diese Membrane an der Pleuelbefestigung im Gegensatz zur vorbekannten Druckscheibenklemmung sehr dicht.In the diaphragm pump according to the invention, the connecting rod has one Support surface, which is a central, a support surface having membrane area supports. Because of her Membrane underside supported, this can become during of the business do not move back and forth on the connecting rod, which unwanted additional flexing work of the membrane is avoided. In particular, a larger support ring also exercises influence the possible delivery capacity of the membrane, because this is especially the case with a larger diameter of the support ring creates a larger piston-like zone that does not deform during the up and down stroke and thus leads to a larger stroke volume. This configuration of the Membrane allows a relatively small, fixed diameter of the connecting rod, so that there are relatively large elastic zones form the too low voltages in the membrane and this leads to a larger stroke in relation to the effective diameter of the membrane. The membrane is therefore characterized by better membrane expansion ratios and their always constant perfect fit. Since the membrane of the invention Diaphragm pump no longer has a central fastening opening required, this membrane is on the connecting rod attachment in the In contrast to the known pressure plate clamping, it is very tight.
Das erfindungsgemäß vorgesehene und vorzugsweise an einem ringförmigen Befestigungsvorsprung oder an zumindest drei, etwa gleichmäßig voneinander beabstandeten Befestigungsvorsprüngen anliegende, zapfenförmige Einsatzteil der erfindungsgemäßen Membran übernimmt die Zentrierung und Führung der Membran während der Schwingbewegungen. Gleichzeitig übernimmt dieses zapfenförmige Einsatzteil die radiale und axiale Führung der Membrane gegenüber dem Pleuel. Die Membrane wird dadurch so präzise auf dem Pleuel fixiert, daß sowohl radiale wie auch axiale Kräfte sie nicht aus ihrer Position gegenüber dem Pleuel verändern.The provided according to the invention and preferably on one annular fastening projection or at least three, approximately evenly spaced fastening projections adjacent, peg-shaped insert part of the invention The membrane takes over the centering and guiding of the membrane during the swinging movements. At the same time, this takes on cone-shaped Insert the radial and axial guidance of the membrane opposite the connecting rod. This makes the membrane so precise the connecting rod fixes that both radial and axial forces not change them from their position in relation to the connecting rod.
Dabei wird eine Ausführungsform bevorzugt, bei der ein auf einem
zur Pleuellängsachse konzentrischen Kreis angeordneter,
ringförmiger Befestigungsvorsprung mit an seinem freien
Randbereich hakenartig seitlich vorspringendem Hintergreifrand
vorgesehen ist. Ein solcher Befestigungsvorsprung am Pleuel
begünstigt die gute Zentrierung und Führung der Membran während
ihrer Schwingbewegungen; gleichzeitig wird die Membran besonders
präzise auf dem Pleuel fixiert.
Möglich ist aber auch, daß mehrere, vorzugsweise zumindest drei
auf einem zur Pleuellängsachse konzentrischen Kreis angeordnete
Befestigungsvorsprünge vorgesehen sind.In this case, an embodiment is preferred in which an annular fastening projection arranged on a circle concentric with the connecting rod longitudinal axis is provided with a rear engagement edge projecting laterally like a hook on its free edge region. Such a fastening projection on the connecting rod favors the good centering and guiding of the membrane during its swinging movements; at the same time, the membrane is particularly precisely fixed on the connecting rod.
But it is also possible that several, preferably at least three, fastening projections arranged on a circle concentric with the connecting rod longitudinal axis are provided.
Eine besonders vorteilhafte Ausführungsform gemäß der Erfindung sieht vor, daß die am Befestigungsende des Pleuels befindliche Stützfläche zur unterseitigen Abstützung des zentralen, eine Auflagefläche aufweisenden Membranbereiches, einen etwa radial über den Querschnitt des Pleuels überstehenden Stützkragen hat und daß die zentrale Auflagefläche der Membrane entsprechend dieser vergrößerten Stützfläche dimensioniert sind. Die entsprechend dimensionierte Membrane überträgt über ihre zentrale Auflagefläche einen Teil der Druckkräfte auf den etwa radial über den Querschnitt des Pleuels überstehenden Stützkragen.A particularly advantageous embodiment according to the invention provides that the one located at the end of the connecting rod Support surface for supporting the central one on the underside Contact area having membrane area, approximately radial has over the cross-section of the connecting rod protruding support collar and that the central contact surface of the membrane accordingly this enlarged support surface are dimensioned. The appropriately dimensioned membrane transmits via its central Contact surface some of the compressive forces on the approximately radial Support collar protruding over the cross-section of the connecting rod.
Um die gute Zentrierung der Membrane am Befestigungsende des Pleuels zu begünstigen, ist es zweckmäßig, wenn an der Stützfläche des Pleuels ein vorzugsweise zentraler Zentriervorsprung zum Eingreifen in eine Gegenausnehmung der Membrane vorgesehen ist.To ensure that the membrane is properly centered at the fastening end of the To favor connecting rods, it is useful if at the Support surface of the connecting rod, preferably a central centering projection for engaging in a counter recess in the membrane is provided.
Um die Membrane über einen möglichst großen radialen Bereich elastisch ausgestalten zu können und um die mögliche Förderleistung der Membrane positiv zu beeinflussen, ist es vorteilhaft, wenn die dem Verdichtungsraum der Pumpe zugewandte Seite der Membrane befestigungsmittelfrei ist. Around the membrane over the largest possible radial area to be able to design elastic and the possible conveying capacity to positively influence the membrane, it is advantageous if the side of the pump facing the compression chamber Membrane is free of fasteners.
Um eine hohe Dichtigkeit an der Pleuelbefestigung zu erreichen, ist es zweckmäßig, wenn die Membrane dem Verdichtungsraum zugewandt durchgehend geschlossen ausgebildet ist.In order to achieve a high level of tightness on the connecting rod attachment, it is useful if the membrane is the compression space facing is continuously closed.
Gemäß einer bevorzugten Ausführungsform ist vorgesehen, daß die erfindungsgemäße Membranpumpe als Mikromembranpumpe ausgebildet ist.According to a preferred embodiment it is provided that the diaphragm pump according to the invention as a micro diaphragm pump is trained.
Weitere Merkmale der Erfindung ergeben sich aus der folgenden Beschreibung eines erfindungsgemäßen Ausführungsbeispieles in Verbindung mit den Ansprüchen sowie der Zeichnung. Die einzelnen Merkmale können je für sich oder zu mehreren bei einer Ausführungsform gemäß der Erfindung verwirklicht sein.Further features of the invention result from the following Description of an embodiment according to the invention in Connection with the claims and the drawing. The single ones Characteristics can be used individually or in groups of one Embodiment can be realized according to the invention.
Die einzige Figur zeigt den Kurbelantrieb 1 sowie eine mit einem
Pleuel 2 des Kurbelantriebes 1 verbundene Membrane 3 einer
Membranpumpe in einer schematischen Darstellung. Das Pleuel
2 des Kurbelantriebes 1 ist mit der Membrane 3 derart verbunden,
daß die Membrane 3 über das Pleuel 2 während des Betriebes der
Membranpumpe hin- und herbewegt wird.The single figure shows the
Das Pleuel 2 hat an seinem der Membrane 3 zugewandten
Befestigungsende eine Stützfläche 4 zur unterseitigen Abstützung
des zentralen, eine Auflagefläche 5 aufweisenden Membranbereiches.
Über die Stützfläche 4 des Pleuels 2 steht ein
konzentrisch zur Pleuellängsachse angeordneter ringförmiger
Befestigungsvorsprung 6 vor, der an seinem freien Randbereich
einen hakenartig seitlich nach außen vorspringenden Hintergreifrand
7 hat. Der in axialer Richtung des Pleuels 2
vorstehende Befestigungvorsprung 6 greift formschlüssig in eine
als Ringnut ausgebildete und in ihrem lichten Querschnitt
entsprechend hakenförmig ausgestaltete Befestigungsöffnung 8
an der Membranunterseite ein. The connecting
Diese ringförmige Befestigungsöffnung 8 begrenzt an der
Membranunterseite ein zapfenförmiges Einsatzteil 9, welches
in der einzigen Figur am inneren Umfangsrand des ringförmigen
Befestigungsvorsprunges 6 anliegt.This annular mounting opening 8 is limited to the
Membrane underside a peg-
Die am Pleuel 2 vorgesehene Stützfläche 4 stützt den zentralen,
die Auflagefläche 5 aufweisenden Membranbereich der Membrane
3 ab. Durch die an ihrer Membranunterseite abgestützte Membrane
3 kann diese sich während des Betriebes der Membranpumpe am
Pleuel nicht mehr hin- und herbewegen, wodurch eine unerwünschte
zusätzliche Walkarbeit der Membrane 3 vermieden wird. Insbesondere
eine größer dimensionierte Stützfläche übt zudem einen
Einfluß auf die mögliche Förderleistung der Membrane 3 aus,
weil diese nämlich insbesondere bei einem größeren Durchmesser
der Stützfläche 4 eine größere kolbenartige Zone schafft, die
sich während des Auf- und Abwärtshubes nicht verformt und somit
zu einem größeren Hubvolumen führt. Gleichzeitig gestattet diese
Konstruktion einen relativ kleinen festen Durchmesser des Pleuels
2, so daß sich verhältnismäßig große elastische Zonen herausbilden,
die zu niedrigen Spannungen in der Membrane 3 und
dadurch zu einem größeren Hub im Verhältnis zum Wirkdurchmesser
der Membrane 3 führen. Die Membrane 3 zeichnet sich daher durch
bessere Membrandehnungsverhältnisse und ihren stets gleichbleibend
einwandfreien Sitz aus. Da die Membrane 3 der hier
dargestellten Membranpumpe keine zentrale Befestigungsöffnung
mehr hat, ist diese Membrane 3 an der Pleuelbefestigung im
Gegensatz zur vorbekannten Druckscheibenklemmung sehr dicht.The
Aus der einzigen Figur wird deutlich, daß die am Befestigungsende
des Pleuels 2 befindliche Stützfläche 4 zur unterseitigen
Abstützung des zentralen, eine Auflagefläche 5 aufweisenden
Membranbereiches, einen etwa radial über den Querschnitt des
Pleuels überstehenden Stützkragen 10 hat, wobei die zentrale
Auflagefläche 5 an der Membrane 3 entsprechend dieser vergrößerten
Sützfläche 4 dimensioniert ist. Die Membrane 3 weist
dazu einen Stützring 12 auf, der zwischen sich und dem
zapfenförmigen Einsatzteil 9 die Befestigungsöffnung 8 begrenzt.From the single figure it is clear that the end of the attachment
of the connecting
Das zapfenförmige Einsatzteil 9 übernimmt während der Schwingbewegungen
der Membrane deren Zentrierung und Führung. Dabei
begünstigt das zentrale Einsatzteil 9 außerdem die radiale und
axiale Führung der Membrane 3 gegenüber dem Pleuel 2.The peg-
Im Zentrum des Befestigungsvorsprunges 6, etwa koaxial zur
Pleuel-Längsachse, kann an der Stützfläche 4 des Pleuels 2
zusätzlich ein zentraler Zentriervorsprung 11 vorgesehen sein,
der in eine Gegenausnehmung der Membrane 3 eingreift. Durch
diesen Zentriervorsprung 11 wird die gute Zentrierung und Führung
der Membrane 3 während der Schwingbewegung noch zusätzlich
begünstigt. Durch die oben beschriebenen Maßnahmen ist die
Membrane 3 so präzise auf dem Pleuel 2 fixiert, daß sowohl
radiale wie auch axiale Kräfte sie nicht aus ihrer Position
gegenüber dem Pleuel verändern.In the center of the fastening projection 6, approximately coaxially to
Connecting rod longitudinal axis, can on the
Da die Membrane 3 am Befestigungsende des Pleuels 2 ausreichend
fest montierbar ist, kann die dem Verdichtungsraum der Pumpe
zugewandte Seite der Membrane 3 befestigungsmittelfrei
ausgestaltet werden. Um dabei eine hohe Dichtigkeit an der
Pleuelbefestigung zu erreichen, ist es vorteilhaft, wenn die
Membrane dem Verdichtungsraum zugewandt durchgehend geschlossen
ausgebildet ist.Since the
Die Membrane 3 zeichnet sich somit durch eine hohe Dichtigkeit
an der Pleuelbefestigung aus. Dabei kann die Membrane sowohl
als Flach- wie auch als Struktur- oder als Formmembrane
ausgebildet sein. Durch die Ausgestaltung der Membrane 3 als
Formmembrane können kleinere schädliche Räume und damit höhere
Verdichtungsverhältnisse erreicht werden. The
Da bei der hier nur schematisch dargestellten Membranpumpe eine
Druckscheibenklemmung nicht erforderlich ist, können bessere
Membrandehnungsverhältnisse erreicht werden. Da das zapfenförmige
Einsatzteil 9 in die vom Befestigungsvorsprung 6 begrenzte
Ausnehmung am Befestigungsende des Pleuels 2 eingreift und da
der in der Befestigungsöffnung 8 verrastbare Befestigungsvorsprung
6 praktisch für eine Selbstzentrierung der Membrane 3
sorgt, kann auf eine zeitaufwendige Ausrichtung der Membrane
3 bei der Montage verzichtet werden. Die Membrane 3 zeichnet
sich dennoch durch einen sets gleichbleibenden einwandfreien
Sitz aus.Since in the diaphragm pump shown only schematically here
Thrust washer is not required, can be better
Membrane expansion ratios can be achieved. Because the cone-shaped
Claims (8)
- Diaphragm pump, having a crank drive (1), which includes a connecting rod (2), and a resilient diaphragm (3) connected to the connecting rod (2), which diaphragm (3) has, on its rear side remote from the compression chamber, at least one undercut fastening hole (8) for the insertion of the complementary-shaped fastening end of the connecting rod (2), the connecting rod (2) having, at its fastening end, a supporting surface (4) to support the underside of the central diaphragm region which includes a bearing surface (5), and at least one fastening projection member, which protrudes substantially in the axial direction of the connecting rod, being provided over the supporting surface (4) of the connecting rod for the form-locking engagement in the central diaphragm region, which has at least one fastening hole (8), characterised in that at least one plug-like insert (9) is provided on the diaphragm underside, and in that, in the assembled position, the insert (9) abuts laterally against the one fastening projection member or against a plurality of fastening projection members (6) of the connecting rod.
- Diaphragm pump according to claim 1, characterised in that a plurality of fastening projection members are provided, which are disposed around a circle concentric with the longitudinal axis of the connecting rod.
- Diaphragm pump according to claim 1, characterised in that an annular fastening projection member (6), which is disposed around a circle concentric with the longitudinal axis of the connecting rod, is provided with an engagement edge (7), which protrudes laterally in a hook-like manner at its free edge region.
- Diaphragm pump according to one of claims 1 to 3, characterised in that the supporting surface (4), situated at the fastening end of the connecting rod (2), has a supporting collar (10), which protrudes substantially radially beyond the cross-section of the connecting rod (2), in order to support the underside of the central diaphragm region, which has a bearing surface (5), and in that the central bearing surface (5) of the diaphragm (3) is dimensioned so as to correspond with this enlarged supporting surface (4).
- Diaphragm pump according to one of claims 1 to 4, characterised in that a preferably central centring projection member (11) is provided on the supporting surface (4) of the connecting rod (2) in order to engage in a counter-recess in the diaphragm.
- Diaphragm pump according to one of claims 1 to 5, characterised in that the side of the diaphragm (3) facing the compression chamber of the pump is free of fastening means.
- Diaphragm pump according to one of claims 1 to 6, characterised in that the diaphragm (3) is continuously closed when facing the compression chamber.
- Diaphragm pump according to one of claims 1 to 7, characterised in that it is in the form of a microdiaphragm pump.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19634922 | 1996-08-29 | ||
| DE19634922A DE19634922C2 (en) | 1996-08-29 | 1996-08-29 | Diaphragm pump |
| PCT/EP1997/003941 WO1998009078A1 (en) | 1996-08-29 | 1997-07-22 | Diaphragm pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0922164A1 EP0922164A1 (en) | 1999-06-16 |
| EP0922164B1 true EP0922164B1 (en) | 2003-03-26 |
Family
ID=7804013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97933693A Expired - Lifetime EP0922164B1 (en) | 1996-08-29 | 1997-07-22 | Diaphragm pump |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6065389A (en) |
| EP (1) | EP0922164B1 (en) |
| JP (1) | JP2000502778A (en) |
| KR (1) | KR100316470B1 (en) |
| DE (2) | DE19634922C2 (en) |
| WO (1) | WO1998009078A1 (en) |
Families Citing this family (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9917736D0 (en) * | 1999-07-29 | 1999-09-29 | Munster Simms Eng Ltd | Diaphragm pumps |
| DE10224750A1 (en) | 2002-06-04 | 2003-12-24 | Fresenius Medical Care De Gmbh | Device for the treatment of a medical fluid |
| US6901960B2 (en) * | 2002-09-06 | 2005-06-07 | Ingersoll-Rand Company | Double diaphragm pump including spool valve air motor |
| US6865981B2 (en) * | 2003-03-11 | 2005-03-15 | Ingersoll-Rand Company | Method of producing a pump |
| US6883417B2 (en) * | 2003-03-19 | 2005-04-26 | Ingersoll-Rand Company | Connecting configuration for a diaphragm in a diaphragm pump |
| US20050272001A1 (en) * | 2004-06-03 | 2005-12-08 | Blain Christopher C | Oral care device |
| US7530796B2 (en) * | 2004-12-07 | 2009-05-12 | The Gillette Company | Compressors |
| US8444416B2 (en) | 2005-04-26 | 2013-05-21 | Braun Gmbh | Valves for personal care devices |
| US8197231B2 (en) | 2005-07-13 | 2012-06-12 | Purity Solutions Llc | Diaphragm pump and related methods |
| US20070017582A1 (en) * | 2005-07-20 | 2007-01-25 | Chenvainu Alexander T | Fluid couplings |
| GB2432195A (en) * | 2005-11-09 | 2007-05-16 | Dlp Ltd | Reciprocating diaphragm shower drain pump |
| WO2007054667A1 (en) * | 2005-11-09 | 2007-05-18 | Dlp Limited | Diaphragm pump |
| US20070134112A1 (en) * | 2005-12-14 | 2007-06-14 | Hupp Evan L | Button diaphragm piston pump |
| DE102007028184A1 (en) | 2007-06-20 | 2008-12-24 | Braun Gmbh | Brush head for a toothbrush |
| US8192401B2 (en) | 2009-03-20 | 2012-06-05 | Fresenius Medical Care Holdings, Inc. | Medical fluid pump systems and related components and methods |
| EP2453946B1 (en) | 2009-07-15 | 2013-02-13 | Fresenius Medical Care Holdings, Inc. | Medical fluid cassettes and related systems |
| US9694125B2 (en) | 2010-12-20 | 2017-07-04 | Fresenius Medical Care Holdings, Inc. | Medical fluid cassettes and related systems and methods |
| US9624915B2 (en) | 2011-03-09 | 2017-04-18 | Fresenius Medical Care Holdings, Inc. | Medical fluid delivery sets and related systems and methods |
| JP6062920B2 (en) * | 2011-04-21 | 2017-01-18 | フレセニウス メディカル ケア ホールディングス インコーポレーテッド | Medical fluid pumping system and related devices and methods |
| WO2013142009A1 (en) | 2012-03-17 | 2013-09-26 | Abbott Medical Optics, Inc. | Surgical cassette |
| US9610392B2 (en) | 2012-06-08 | 2017-04-04 | Fresenius Medical Care Holdings, Inc. | Medical fluid cassettes and related systems and methods |
| US9500188B2 (en) | 2012-06-11 | 2016-11-22 | Fresenius Medical Care Holdings, Inc. | Medical fluid cassettes and related systems and methods |
| US9561323B2 (en) | 2013-03-14 | 2017-02-07 | Fresenius Medical Care Holdings, Inc. | Medical fluid cassette leak detection methods and devices |
| US10117985B2 (en) | 2013-08-21 | 2018-11-06 | Fresenius Medical Care Holdings, Inc. | Determining a volume of medical fluid pumped into or out of a medical fluid cassette |
| US10330094B2 (en) | 2013-08-26 | 2019-06-25 | Blue-White Industries, Ltd. | Sealing diaphragm and methods of manufacturing said diaphragm |
| DE102015226463A1 (en) * | 2015-12-22 | 2017-06-22 | Robert Bosch Gmbh | Magnetic actuator for a delivery unit |
| DE102020125567A1 (en) * | 2020-09-30 | 2022-03-31 | Ulman Dichtungstechnik Gmbh | Composite diaphragm for diaphragm pumps |
| CN113153712A (en) * | 2021-04-27 | 2021-07-23 | 烟台东德氢能技术有限公司 | Diaphragm compressor |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2287627A (en) * | 1940-01-23 | 1942-06-23 | Job F Malsbary | Diaphragm pump |
| US2641283A (en) * | 1947-10-13 | 1953-06-09 | Junius W Houston | Pumping device |
| US3203186A (en) * | 1960-08-25 | 1965-08-31 | Edwin J Lukas | Force transmitting system |
| FR1564867A (en) * | 1968-02-29 | 1969-04-25 | ||
| DE3311105C2 (en) * | 1983-03-26 | 1987-01-29 | Albert Klopfer Gmbh, 7253 Renningen | Turret head |
| DE3311104A1 (en) * | 1983-03-26 | 1984-09-27 | Erich 7812 Bad Krozingen Becker | Diaphragm pump |
| DE29505021U1 (en) * | 1995-03-24 | 1995-05-18 | Knf-Neuberger Gmbh, 79112 Freiburg | Diaphragm pump with a shaped membrane |
-
1996
- 1996-08-29 DE DE19634922A patent/DE19634922C2/en not_active Expired - Lifetime
-
1997
- 1997-07-22 KR KR1019997001429A patent/KR100316470B1/en not_active IP Right Cessation
- 1997-07-22 JP JP10511212A patent/JP2000502778A/en active Pending
- 1997-07-22 DE DE59709640T patent/DE59709640D1/en not_active Expired - Lifetime
- 1997-07-22 WO PCT/EP1997/003941 patent/WO1998009078A1/en active IP Right Grant
- 1997-07-22 EP EP97933693A patent/EP0922164B1/en not_active Expired - Lifetime
-
1999
- 1999-02-25 US US09/257,901 patent/US6065389A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| WO1998009078A1 (en) | 1998-03-05 |
| DE59709640D1 (en) | 2003-04-30 |
| EP0922164A1 (en) | 1999-06-16 |
| US6065389A (en) | 2000-05-23 |
| KR20000035807A (en) | 2000-06-26 |
| KR100316470B1 (en) | 2001-12-12 |
| DE19634922A1 (en) | 1998-03-05 |
| JP2000502778A (en) | 2000-03-07 |
| DE19634922C2 (en) | 2000-03-23 |
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