EP3519696A1 - Pump diaphragm - Google Patents

Pump diaphragm

Info

Publication number
EP3519696A1
EP3519696A1 EP17772683.3A EP17772683A EP3519696A1 EP 3519696 A1 EP3519696 A1 EP 3519696A1 EP 17772683 A EP17772683 A EP 17772683A EP 3519696 A1 EP3519696 A1 EP 3519696A1
Authority
EP
European Patent Office
Prior art keywords
pump
rubber
fluid
diaphragm
core
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.)
Granted
Application number
EP17772683.3A
Other languages
German (de)
French (fr)
Other versions
EP3519696B1 (en
Inventor
Maria del Mar DIEZ DIAZ
Rudolf Randler
Raphael KÄLIN
Norbert Haberland
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.)
Daetwyler Schweiz AG
Original Assignee
Daetwyler Schweiz AG
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 Daetwyler Schweiz AG filed Critical Daetwyler Schweiz AG
Publication of EP3519696A1 publication Critical patent/EP3519696A1/en
Application granted granted Critical
Publication of EP3519696B1 publication Critical patent/EP3519696B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F05C2225/02—Rubber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F05C2225/06—Polyamides, e.g. NYLON
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F05C2225/08—Thermoplastics

Definitions

  • the invention relates to a pump diaphragm, in particular metering pump diaphragm, for a diaphragm pump for delivering a fluid.
  • a diaphragm pump for conveying fluids has, as an essential element, a pump diaphragm which comprises a circular functional region and a peripheral clamping edge surrounding the functional region. With the clamping edge, it is mounted in the diaphragm pump. The drive of the pump through the pump diaphragm is separated from the fluid in the pump chamber. To convey the fluid, the circular functional area of the pump diaphragm in the operating state is deflected either hydraulically, pneumatically, mechanically or electromagnetically essentially along a longitudinal axis running through the center of the functional area. driven.
  • Mechanically powered pump diaphragms typically include a flexible membrane body of rubber and a solid core partially embedded therein with a drive connector.
  • the solid core is driven in most cases via a connecting rod and an eccentric of an electric motor.
  • the pumping action is then achieved by the periodic deflection of the pump diaphragm resp. of the circular functional area of the pump diaphragm substantially along the longitudinal axis of the pump diaphragm extending through the center of the functional area, ie the deflection is not exactly axial, but the pump diaphragm usually also experiences a lateral resp depending on the geometric configuration of the driving components. staggering deflection.
  • the solid core is made of metal or plastic and provided with a bonding agent which forms a more or less strong bonding layer between the core and the rubber of the membrane body.
  • Such pump diaphragms are used, inter alia, in metering pumps z. B. used for dialysis machines, in which a certain, constant volume of fluid must be promoted in each pumping cycle.
  • An object of the invention is to provide a pump diaphragm, in which a weakening or destruction of the connection between the core and membrane body is prevented or at least greatly delayed, and so a time-dependent change in the delivery volume does not occur or is at least greatly delayed.
  • the pump diaphragm for a diaphragm pump for conveying a fluid comprises a fixed core with a connection device for a drive rod of the diaphragm pump and a plate-shaped, elastic membrane body made of rubber with a peripheral clamping edge.
  • the solid core is at least partially embedded in the membrane body.
  • the solid core is made of a thermoplastic material and adhesion promoter free forms with the elastic membrane body made of rubber covalent bonds.
  • thermoplastic material and the rubber are chosen such that they enter into a direct, adhesion promoter-free chemical plastic-rubber bond to each other in the preparation of the pump membrane at the boundary layer to each other resp.
  • Plastic and rubber are covalently cross-linked at the boundary layer. A vulnerable to weakening or destruction connecting layer between the core and membrane body is not present in this way.
  • the core is first made of plastic and then the rubber vulcanized directly on the core. During the vulcanization of the rubber, the covalent bonds are also formed at the boundary layer between plastic and rubber.
  • the rubber may be a peroxide cross-linked rubber, especially peroxide cross-linked ethylene-propylene-diene rubber (EPDM).
  • EPDM peroxide cross-linked ethylene-propylene-diene rubber
  • the plastic may be a polyamide 612 or a polyphenylene ether, especially poly-2,6-dimethyl-1,4-phenylene ether.
  • plastic-rubber-material combinations are: polyamide 612 (as marketed, for example, under the trade name Vestamid DX 9325 "ISO 1874-1 PA612, MH, 14-100, GF40" by Evonik Industries AG) or polyphenylene ethers, in particular Poly-2,6-dimethyl-1,4-phenylene ether (such as marketed under the tradename Vestoran 1900 GF20 by Evonik Industries AG) together with a peroxide cross-linked ethylene-propylene-diene rubber (EPDM).
  • polyamide 612 as marketed, for example, under the trade name Vestamid DX 9325 "ISO 1874-1 PA612, MH, 14-100, GF40” by Evonik Industries AG
  • polyphenylene ethers in particular Poly-2,6-dimethyl-1,4-phenylene ether (such as marketed under the tradename Vestoran 1900 GF20 by Evonik Industries AG) together with a peroxide cross-linked ethylene-propylene
  • the rubber may be a silicone rubber or fluoro-silicone rubber (MVQ / FMQV) and the plastic may be a polybutylene terephthalate (PBT).
  • MVQ / FMQV fluoro-silicone rubber
  • PBT polybutylene terephthalate
  • the core can also have a form optimized for mechanical anchoring, as explained below. Both the chemical and mechanical anchoring features can also be considered as separate inventions that accomplish the same task of improved functionality and longevity.
  • the combination of chemical anchoring with the mechanical anchoring shown below has a synergistic effect in that the overall surface area of the boundary layer between the core and the membrane body is significantly increased by the characteristics of the mechanical anchoring.
  • the solid core may comprise a plate-shaped anchoring plate having a plurality of through holes.
  • the passage openings are usually arranged in a ring around the longitudinal axis of the pump diaphragm.
  • a particularly good mechanical anchoring of the membrane body to the core can be achieved by the passage openings from the fluid side facing away in the direction of the fluid-facing side seen at least one constriction of the Have cross-section. As a result, the force is better transferred from the core to the membrane body in a pulling movement of the drive.
  • the constriction may be formed as a circumferential shoulder or flange and is usually approximately centrally in the through hole.
  • the circumferential shoulder or flange may have interruptions, so that the constriction is formed by a plurality of longitudinal ribs.
  • the constriction may also be formed by a conical passage opening.
  • the anchoring plate may be at least partially embedded in the membrane body, wherein it is always completely covered on the fluid side by the membrane body. On the fluid-remote side, it may be partially exposed, ie. not completely covered by the membrane body.
  • the solid core may comprise a plate-shaped anchoring plate having on the fluid-remote side an annular groove in which a plurality of through holes are arranged. This groove and the passage openings are completely filled at the pump diaphragm of the membrane body. As a result, the force is better transferred from the core to the membrane body in a pulling movement of the drive.
  • a radially outer wall of the groove may have a lower height than a radially inner wall, so that a peripheral edge of the anchoring plate is completely surrounded by the membrane body.
  • the annular groove may be combined with the above-described annularly arranged passage openings with constriction.
  • the core may comprise a pin, at the fluid-remote end of which the connection device is arranged.
  • the pin can have on the side facing the fluid a central blind hole which is filled by the membrane body.
  • the connector may be a metallic threaded insert. This can be molded directly with the core. Alternatively, the connection device can also be formed integrally with the core.
  • Fig. 2 is a sectional view of the pump diaphragm
  • FIG 3 is a perspective view of the fluid-remote side of a fixed core of the pump diaphragm.
  • FIG. 4 is a perspective view of the fluid-facing side of the fixed core
  • Fig. 5 is a perspective partial sectional view of
  • Fig. 1 shows a perspective view of a pump diaphragm 1 for a diaphragm pump, in particular a Dosiermembranpumpe, for conveying a fluid.
  • Fig. 2 shows a sectional view through the pump membrane from FIG. 1.
  • the pump membrane 1 comprises a plate-shaped, elastic membrane body 2 made of rubber with a circular functional region 8 and a peripheral clamping edge 6 revolving around a longitudinal axis A of the pump membrane 1.
  • the longitudinal axis A runs through the center of the circular functional area 8 and parallel to the deflection direction of the Pumenpenmembranl.
  • the pump diaphragm 1 is in the installed state with the clamping edge 6 in a pump housing for delimiting a pump chamber, in which flows the fluid to be pumped, kept sealed.
  • the clamping edge 6 is T-shaped in cross-section. Other shapes are also possible.
  • the pump membrane 1 comprises a fixed core 3 which is at least partially embedded in the membrane body 2 and fluid side, ie. towards the pump room, completely covered by the membrane body 2.
  • the core 3 On the side facing away from the fluid, the core 3 has a connection device 4, which is operatively connected to the drive of the diaphragm pump for deflecting the pump diaphragm 1 along the longitudinal axis A.
  • the core 3 is made in one piece from a thermoplastic material which forms adhesive bonds with the elastic membrane body 2 made of rubber covalent bonds.
  • the thermoplastic material may be a polyamide 612 or a polyphenylene ether, in particular poly-2,6-dimethyl-1,4-phenylene ether, which is covalent bonds with peroxide-crosslinked rubber, preferably peroxidically crosslinked ethylene-propylene-diene rubber (EPDM) received.
  • EPDM peroxidically crosslinked ethylene-propylene-diene rubber
  • a silicone rubber or fluoro-silicone rubber MVQ / FMQV
  • a polybutylene terephthalate PBT
  • the core 3 comprises an anchoring plate 5, which is at least partially covered by the membrane body 2 on the fluid-remote side.
  • the core 3 further comprises a pin 7, and the connection device 4 is not arranged directly in the anchoring plate 5 but at the fluid-remote end of the pin. 7
  • connection device 4 as a separate part, for. B. in the form of a threaded insert, fixed in the core.
  • the core 7 may also be formed polygonal at the fluid remote end, so that he is festschraub bar with a fork bowl on a drive rod.
  • the pump membrane 1 can be produced by injection molding, for example by a two-component injection molding process, in which first the solid core 3 and subsequently the membrane body 2 are injected become.
  • a metallic connection device 4 for example in the form of a threaded insert, be molded directly with the core material.
  • Fig. 3 and Fig. 4 show a perspective exploded view of the fluid-remote side, respectively. the fluid-facing side of the fixed core 3.
  • Fig. 5 shows a perspective, partially sectional view of the pump membrane 1 from FIGS. 1 and 2 with the core of FIG. 3 and 4.
  • the anchoring plate 5 has an inner ring of a plurality of inner through holes 51 disposed about the longitudinal axis A. As shown in FIG. 2 and in FIG. 5, the inner passage openings 51 for the mechanical anchoring of the core 3 in the membrane body 2 each have a circumferential shoulder, so that they are narrowed on the fluid side. The inner passage openings 51 of the anchoring plate 5 are completely felt in the finished pump membrane 1 with the rubber of the membrane body.
  • the anchoring plate 5 further on the fluid side facing away from a circumferential groove 52, in which an outer ring of a plurality of outer through-holes 53 is arranged.
  • the outer wall 54 of the groove 52 has a small height, the inner wall 55 of the groove 52, so that in the finished pump membrane 1, the membrane body 2 encloses the peripheral edge of the anchoring plate 5 with its outer wall 54 and the groove 52 completely fills together with the outer through holes 53.
  • the core 3 has a fluid side, a central opening 31, which forms a blind hole together with the connection device.
  • this blind hole is also filled with the rubber of the membrane body 2.
  • the described structures of the core 2 (through holes, groove, blind hole) all lead to an enlargement of the connecting surface between the core 3 and membrane body 2, which leads to a much more durable and stronger attachment of the core 3 in the membrane body 2 in particular in the chemical anchoring described above. 1 pump diaphragm

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

Abstract

The invention relates to a pump diaphragm (1) for a diaphragm pump for conveying a fluid, comprising a solid core (3) with a connection device (4) for a drive rod of the diaphragm pump, and a plate-shaped elastic diaphragm body (2) made of rubber having a peripheral clamping edge (6). plaThe solid core (3) is embedded at least partially in the diaphragm body (2), and, according to the invention, the solid core (3) is produced from a thermoplastic and forms covalent bonds with the elastic diaphragm body (2) made of rubber without adhesive. For this purpose, the thermoplastic, for example polyamide 612 or polyphenylene ether, and the rubber, a periodically cross-linked rubber such as EPDM, are selected in such a way that they are covalently cross-linked with one another at the boundary layer. In this way, a bonding layer that is susceptible to weakening or destruction is not present between the core and the diaphragm body.

Description

Pumpenmembran  pump diaphragm
Technisches Gebiet Technical area
Die Erfindung betrifft eine Pumpenmembran, insbesondere Dosierpumpenmembran, für eine Membranpumpe zur Förderung eines Fluides. The invention relates to a pump diaphragm, in particular metering pump diaphragm, for a diaphragm pump for delivering a fluid.
Technischer Hintergrund Technical background
Eine Membranpumpe zur Förderung von Fluiden weist als wesentliches Element eine Pumpenmembran auf, welche einen kreisförmigen Funktionsbereich und einen den Funktionsbereich umgebenden peripheren Einspannrand umfasst. Mit dem Einspannrand ist sie in der Membranpumpe befestigt. Dabei ist der Antrieb der Pumpe durch die Pumpenmembran vom Fluid in der Pumpenkammer getrennt. Zur Förderung des Fluids wird der kreisförmiger Funktionsbereich der Pumpenmembran im Betriebszustand entweder hydraulisch, pneumatisch, mechanisch oder elektromagnetisch im Wesentlichen entlang einer durch das Zentrum des Funktionsbereichs verlaufenden Längsachse ausgelenkt resp. angetrieben . A diaphragm pump for conveying fluids has, as an essential element, a pump diaphragm which comprises a circular functional region and a peripheral clamping edge surrounding the functional region. With the clamping edge, it is mounted in the diaphragm pump. The drive of the pump through the pump diaphragm is separated from the fluid in the pump chamber. To convey the fluid, the circular functional area of the pump diaphragm in the operating state is deflected either hydraulically, pneumatically, mechanically or electromagnetically essentially along a longitudinal axis running through the center of the functional area. driven.
Mechanisch angetriebene Pumpenmembranen weisen typischerweise einen flexiblen Membrankörper aus Kautschuk und einen teilweise darin eingebetteten festen Kern mit einer Anschlusseinrichtung für den Antrieb auf. Der feste Kern ist in den meisten Fällen über eine Pleuelstange und einen Exzenter von einem Elektromotor angetrieben. Die Pumpwirkung wird dann durch die periodisch Auslenkung der Pumpenmembran erzielt resp. des kreisförmigen Funktionsbereichs der Pumpenmembran im Wesentlichen entlang der durch das Zentrum des Funktionsbereichs verlaufenden Längsachse der Pumpenmembran, d.h. die Auslenkung ist nicht exakt axial, sondern die Pumpenmembran erfährt je nach geometrischer Ausgestaltung der antreibenden Komponenten in der Regel auch eine seitliche resp. taumelnde Auslenkung. Bei den bekannten, mechanisch angetriebenen Pumpenmembranen, z.B. aus US2011311379, ist der feste Kern aus Metall oder Kunststoff gefertigt und mit einem Haftvermittler versehen, welcher eine mehr oder weniger feste Verbindungsschicht zwischen dem Kern und dem Kautschuk des Membrankörper ausbildet. Derartige Pumpenmembranen werden unter anderem in Dosierpumpen z. B. für Dialysegeräte verwendet, bei welchen in jedem Pumpzyklus ein bestimmtes, gleichbleibendes Fluidvolumen gefördert werden muss. Mechanically powered pump diaphragms typically include a flexible membrane body of rubber and a solid core partially embedded therein with a drive connector. The solid core is driven in most cases via a connecting rod and an eccentric of an electric motor. The pumping action is then achieved by the periodic deflection of the pump diaphragm resp. of the circular functional area of the pump diaphragm substantially along the longitudinal axis of the pump diaphragm extending through the center of the functional area, ie the deflection is not exactly axial, but the pump diaphragm usually also experiences a lateral resp depending on the geometric configuration of the driving components. staggering deflection. In the known, mechanically driven pump diaphragms, for example from US2011311379, the solid core is made of metal or plastic and provided with a bonding agent which forms a more or less strong bonding layer between the core and the rubber of the membrane body. Such pump diaphragms are used, inter alia, in metering pumps z. B. used for dialysis machines, in which a certain, constant volume of fluid must be promoted in each pumping cycle.
Es hat sich nun bei Versuchen durch die Anmelderin gezeigt, dass beispielsweise bei Pumpenmembranen, die in Dialysegeräten verwendet werden, die geförderten Medien, z. B. auch bei der Reinigung der Pumpe verwendete Desinfektionsmittel, mit der Zeit durch den Kautschuk bis in die Grenzschicht zwischen Kern und Membrankörper diffundieren können und dabei die Verbindungsschicht langsam zerstören und somit die Verbindung zwischen Kern und Membrankörper über die Zeit schwächen. Dies führt dann zu zunehmenden Ungenauigkeiten des Pumpvolumens, weil der Kern nicht mehr fest im Membrankörper verankert ist und beim Zurückziehen des Kern der flexible Membrankörper nicht mehr gleichmässig und vollständig zurückbeweget wird . Die fortschreitende Zerstörung der Verbindung zwischen Kern und Membrankörper führt schliesslich bis zum kompletten Versagen der Pumpenmembran resp. zum Verlust der Pumpleistung .  It has now been found in experiments by the Applicant that, for example, in pumping membranes used in dialysis machines, the subsidized media, eg. B. also used in the cleaning of the pump disinfectant, with time can diffuse through the rubber into the boundary layer between the core and membrane body while slowly destroy the connecting layer and thus weaken the connection between the core and membrane body over time. This then leads to increasing inaccuracies in the pumping volume, because the core is no longer firmly anchored in the membrane body and when retracting the core of the flexible membrane body is no longer uniform and completely zurückbeweget. The progressive destruction of the connection between the core and membrane body eventually leads to complete failure of the pump diaphragm resp. to the loss of pumping power.
Dasselbe Problem besteht auch bei Membranpumpen zur Förderung von aggressiven Fluiden, wie beispielsweise Lösungsmittel oder lösungsmittelenthaltende Fluide. Auch beim Pumpenmembranen die mit sehr relativ hohen Frequenzen von 50 Hz oder mehr betrieben werden, kann die starke Belastung zu einer zunehmenden Zerstörung der Verbindung zwischen Kern und Membrankörper führen.  The same problem also exists with diaphragm pumps for pumping aggressive fluids, such as solvents or solvent-containing fluids. Even with pump diaphragms which are operated at very relatively high frequencies of 50 Hz or more, the heavy load can lead to an increasing destruction of the connection between the core and the membrane body.
Aus EP1892414 ist eine Lösung bekannt, bei welcher die Pumpenmembran fluidseitig mit einer als Permeationsbarriere ausgebildeten Sperrschicht versehen ist. Eine solche Pumpenmembran weist jedoch einen wesentlich komplexeren Aufbau auf und ist entsprechen kostspielig in der Herstellung. Darstellung der Erfindung From EP1892414 a solution is known in which the pump membrane is provided on the fluid side with a barrier layer designed as a permeation barrier. However, such a pump membrane has a much more complex structure and is correspondingly expensive to manufacture. Presentation of the invention
Eine Aufgabe der Erfindung ist es, eine Pumpenmembran anzugeben, bei welcher eine Schwächung oder Zerstörung der Verbindung zwischen Kern und Membrankörper verhindert oder zumindest stark verzögert ist, und so eine zeitabhängige Veränderung des Fördervolumens nicht auftritt oder zumindest stark verzögert ist. An object of the invention is to provide a pump diaphragm, in which a weakening or destruction of the connection between the core and membrane body is prevented or at least greatly delayed, and so a time-dependent change in the delivery volume does not occur or is at least greatly delayed.
Diese Aufgabe wird durch eine Pumpenmembran mit den Merkmalen des Anspruch 1 gelöst.  This object is achieved by a pump diaphragm having the features of claim 1.
Die Pumpenmembran für eine Membranpumpe zur Förderung eines Fluides umfasst einen festen Kern mit einer Anschlusseinrichtung für eine Antriebsstange der Membranpumpe und einen tellerförmigen, elastischen Membrankörper aus Kautschuk mit einem peripheren Einspannrand . Der feste Kern ist wenigstens teilweise im Membrankörper eingebettet. Weiter ist der feste Kern aus einem thermoplastischen Kunststoff gefertigt und haftvermittlerfrei mit dem elastischen Membrankörper aus Kautschuk kovalente Bindungen ausbildet. The pump diaphragm for a diaphragm pump for conveying a fluid comprises a fixed core with a connection device for a drive rod of the diaphragm pump and a plate-shaped, elastic membrane body made of rubber with a peripheral clamping edge. The solid core is at least partially embedded in the membrane body. Next, the solid core is made of a thermoplastic material and adhesion promoter free forms with the elastic membrane body made of rubber covalent bonds.
D.h. der thermoplastische Kunststoff und der Kautschuk sind derart gewählt, dass sie bei der Herstellung der Pumpenmembran an deren Grenzschicht zueinander eine direkte, haftvermittlerfreie chemische Kunststoff-Kautschuk- Bindung eingehen resp. Kunststoff und Kautschuk an der Grenzschicht kovalent miteinander vernetzt sind . Eine für Schwächung oder Zerstörung anfällige Verbindungsschicht zwischen Kern und Membrankörper ist auf diese Weise nicht vorhanden.  That the thermoplastic material and the rubber are chosen such that they enter into a direct, adhesion promoter-free chemical plastic-rubber bond to each other in the preparation of the pump membrane at the boundary layer to each other resp. Plastic and rubber are covalently cross-linked at the boundary layer. A vulnerable to weakening or destruction connecting layer between the core and membrane body is not present in this way.
Zu Herstellung einer solchen Pumpenmembran wird erst der Kern aus Kunststoff gefertigt und anschliessend der Kautschuk direkt am Kern ausvulkanisiert. Bei der Vulkanisierung des Kautschuks entstehen auch an der Grenzschicht zwischen Kunststoff und Kautschuk die kovalenten Bindungen. To produce such a pump membrane, the core is first made of plastic and then the rubber vulcanized directly on the core. During the vulcanization of the rubber, the covalent bonds are also formed at the boundary layer between plastic and rubber.
Bevorzugte Ausführungsformen der Erfindung sind in den abhängigen Ansprüchen angegeben. In einigen Ausführungsformen kann der Kautschuk ein peroxidisch vernetzter Kautschuk sein, insbesondere peroxidisch vernetzter Ethylen-Propylen-Dien- Kautschuk (EPDM). Preferred embodiments of the invention are indicated in the dependent claims. In some embodiments, the rubber may be a peroxide cross-linked rubber, especially peroxide cross-linked ethylene-propylene-diene rubber (EPDM).
In einigen Ausführungsformen kann der Kunststoff ein Polyamid 612 oder ein Polyphenylenether, insbesondere Poly-2,6-dimethyl- l,4-phenylenether, sein. In some embodiments, the plastic may be a polyamide 612 or a polyphenylene ether, especially poly-2,6-dimethyl-1,4-phenylene ether.
Besonders geeignete Kunststoff-Kautschuk-Material-Paarungen sind : Polyamid 612 (wie z. B. unter dem Handelsnamen Vestamid DX 9325 „ISO 1874-1 PA612, MH, 14-100, GF40" von Evonik Industries AG vermarktet) oder Polyphenylenether, insbesondere Poly-2,6-dimethyl-l,4-phenylenether (wie z. B. unter dem Handelsnamen Vestoran 1900 GF20 von Evonik Industries AG vermarktet) zusammen mit einem peroxidisch vernetzten Ethylen-Propylen- Dien-Kautschuk (EPDM). Particularly suitable plastic-rubber-material combinations are: polyamide 612 (as marketed, for example, under the trade name Vestamid DX 9325 "ISO 1874-1 PA612, MH, 14-100, GF40" by Evonik Industries AG) or polyphenylene ethers, in particular Poly-2,6-dimethyl-1,4-phenylene ether (such as marketed under the tradename Vestoran 1900 GF20 by Evonik Industries AG) together with a peroxide cross-linked ethylene-propylene-diene rubber (EPDM).
In einigen Ausführungsformen kann der Kautschuk eine Silikonkautschuk oder Fluor-Silikonkautschuk (MVQ/FMQV) und der Kunststoff ein Polybutylenterephthalat (PBT) sein.  In some embodiments, the rubber may be a silicone rubber or fluoro-silicone rubber (MVQ / FMQV) and the plastic may be a polybutylene terephthalate (PBT).
Neben der verbesserten chemischen Verankerung des Kerns innerhalb des Membrankörpers kann auch der Kern eine für eine mechanische Verankerung optimierte Form aufweisen, wie im Folgenden erläutert wird . Sowohl die Merkmale der chemischen wie auch der mechanischen Verankerung können auch als eigenständige Erfindungen betrachten werden, welche die gleiche Aufgabe der verbesserten Funktionalität und Langlebigkeit lösen. Die Kombination der chemischen Verankerung mit der im Folgenden dargestellten mechanischen Verankerung zeigen jedoch einen synergistischen Effekt indem durch die Merkmale der mechanischen Verankerung die Gesamtfläche der Grenzschicht zwischen Kern und Membrankörper wesentlich vergrössert ist. In addition to the improved chemical anchoring of the core within the membrane body, the core can also have a form optimized for mechanical anchoring, as explained below. Both the chemical and mechanical anchoring features can also be considered as separate inventions that accomplish the same task of improved functionality and longevity. However, the combination of chemical anchoring with the mechanical anchoring shown below has a synergistic effect in that the overall surface area of the boundary layer between the core and the membrane body is significantly increased by the characteristics of the mechanical anchoring.
In einigen Ausführungsformen kann der feste Kern eine tellerförmige Verankerungsplatte mit mehreren Durchgangsöffnungen umfassen. Die Durchgangsöffnungen sind in der Regel ringförmig um die Längsachse der Pumpenmembran angeordnet. Eine besonders gute mechanische Verankerung des Membrankörpers am Kern kann erreicht werden, indem die Durchgangsöffnungen von der fluidabgewandten Seite in Richtung der fluidzugewandten Seite gesehen jeweils mindestens eine Verengung des Querschnitts aufweisen. Dadurch wird bei einer Zugbewegung des Antriebs die Kraft vom Kern besser auf den Membrankörper übertragen. In some embodiments, the solid core may comprise a plate-shaped anchoring plate having a plurality of through holes. The passage openings are usually arranged in a ring around the longitudinal axis of the pump diaphragm. A particularly good mechanical anchoring of the membrane body to the core can be achieved by the passage openings from the fluid side facing away in the direction of the fluid-facing side seen at least one constriction of the Have cross-section. As a result, the force is better transferred from the core to the membrane body in a pulling movement of the drive.
Die Verengung kann als umlaufender Absatz oder Flansch ausgebildet sein und setzt in der Regel etwa mittig in der Durchgangsöffnung an. Der umlaufende Absatz oder Flansch kann Unterbrechungen aufweisen, so dass die Verengung durch mehrere Längsrippen ausgebildet ist. Die Verengung kann auch durch eine konische Durchgangsöffnung ausgebildet sein.  The constriction may be formed as a circumferential shoulder or flange and is usually approximately centrally in the through hole. The circumferential shoulder or flange may have interruptions, so that the constriction is formed by a plurality of longitudinal ribs. The constriction may also be formed by a conical passage opening.
Die Verankerungsplatte kann wenigstens teilweise im Membrankörper eingebettet sein, wobei sie fluidseitig immer vollständig vom Membrankörper überdeckt ist. An der fluidabgewandten Seite kann sie teilweise freiliegend sein, d .h. nicht vollständig vom Membrankörper überdeckt sein.  The anchoring plate may be at least partially embedded in the membrane body, wherein it is always completely covered on the fluid side by the membrane body. On the fluid-remote side, it may be partially exposed, ie. not completely covered by the membrane body.
In einigen Ausführungsformen kann der feste Kern eine tellerförmige Verankerungsplatte umfassen, die an der fluidabgewandten Seite eine ringförmige Nut aufweist, in welcher mehrere Durchgangsöffnungen angeordnet sind . Diese Nut und die Durchgangöffnungen sind bei der Pumpenmembran vollständig vom Membrankörper ausgefüllt. Dadurch wird bei einer Zugbewegung des Antriebs die Kraft vom Kern besser auf den Membrankörper übertragen.  In some embodiments, the solid core may comprise a plate-shaped anchoring plate having on the fluid-remote side an annular groove in which a plurality of through holes are arranged. This groove and the passage openings are completely filled at the pump diaphragm of the membrane body. As a result, the force is better transferred from the core to the membrane body in a pulling movement of the drive.
Weiter kann eine radial äussere Wand der Nut eine geringere Höhe aufweisen als eine radial innere Wand, so dass ein peripherer Rand der Verankerungsplatte vollständig vom Membrankörper umgeben ist.  Further, a radially outer wall of the groove may have a lower height than a radially inner wall, so that a peripheral edge of the anchoring plate is completely surrounded by the membrane body.
Die ringförmige Nut kann mit den oben beschriebenen ringförmig angeordneten Durchgangsöffnungen mit Verengung kombiniert sein.  The annular groove may be combined with the above-described annularly arranged passage openings with constriction.
In einigen Ausführungsformen kann der Kern einen Zapfen aufweisen, an dessen fluidabgewandten Ende die Anschlusseinrichtung angeordnet ist. Der Zapfen kann an der fluidzugewandten Seite ein zentrales Sackloch aufweisen, welches durch den Membrankörper ausgefüllt ist.  In some embodiments, the core may comprise a pin, at the fluid-remote end of which the connection device is arranged. The pin can have on the side facing the fluid a central blind hole which is filled by the membrane body.
In einigen Ausführungsformen kann die Anschlusseinrichtung ein metallischer Gewindeeinsatz sein. Dieser kann direkt mit dem Kern umspritzt sein. Alternativ kann die Anschlusseinrichtung auch einstückig mit dem Kern ausgebildet sein. Kurze Erläuterung zu den Figuren In some embodiments, the connector may be a metallic threaded insert. This can be molded directly with the core. Alternatively, the connection device can also be formed integrally with the core. Brief explanation of the figures
Die Erfindung soll nachfolgend anhand von Ausführungsbeispielen im Zusammenhang mit der(n) Zeichnung(en) näher erläutert werden. Es zeigen : Fig. 1 eine perspektivische Ansicht auf die fluidabgewandten Seite einer The invention will be explained in more detail below with reference to embodiments in connection with the (s) drawing (s). 1 shows a perspective view of the fluid-remote side of a
Pumpenmembran mit festem Kern und elastischem Membrankörper; Pump diaphragm with fixed core and elastic membrane body;
Fig. 2 eine Schnittdarstellung der Pumpenmembran; Fig. 2 is a sectional view of the pump diaphragm;
Fig. 3 eine perspektivische Ansicht auf die fluidabgewandte Seite eines festen Kerns der Pumpenmembran;  3 is a perspective view of the fluid-remote side of a fixed core of the pump diaphragm.
Fig. 4 eine perspektivische Ansicht auf die fluidzugewandte Seite des festen Kern; und FIG. 4 is a perspective view of the fluid-facing side of the fixed core; FIG. and
Fig. 5 eine perspektivische teilweise Schnittdarstellung der  Fig. 5 is a perspective partial sectional view of
Pumpenmembran.  Pump diaphragm.
Wege zur Ausführung der Erfindung Ways to carry out the invention
Fig. 1 zeigt perspektivische Ansicht einer Pumpenmembran 1 für eine Membranpumpe, insbesondere eine Dosiermembranpumpe, zur Förderung eines Fluides. Fig . 2 zeigt eine Schnittdarstellung durch die Pumpenmembran aus Fig. 1. Die Pumpenmembran 1 umfasst einen tellerförmigen, elastischen Membrankörper 2 aus Kautschuk mit einem kreisförmigen Funktionsbereich 8 und einem peripheren, eine Längsachse A der Pumpenmembran 1 umlaufenden Einspannrand 6. Die Längsachse A verläuft durch das Zentrum des kreisförmigen Funktionsbereichs 8 und parallel zur Auslenkrichtung der Pumenpenmembranl . Die Pumpenmembran 1 ist im eingebauten Zustand mit dem Einspannrand 6 in einem Pumpengehäuse zur Abgrenzung eines Pumpraums, in welchem das zu pumpende Fluid fliesst, dichtend gehalten. In der gezeigten Ausführungsform ist der Einspannrand 6 im Querschnitt T- förmig ausgestaltet. Andere Formen sind auch möglich . Weiter umfasst die Pumpenmembran 1 einen festen Kern 3, welcher wenigstens teilweise im Membrankörper 2 eingebettet und fluidseitig, d .h. zum Pumpraum hin, vollständig durch den Membrankörper 2 überdeckt ist. An der fluidabgewandten Seite weist der Kern 3 eine Anschlusseinrichtung 4 auf, welche mit dem Antrieb der Membranpumpe zur Auslenkung Pumpenmembran 1 entlang der Längsachse A wirkverbindbar ist. Fig. 1 shows a perspective view of a pump diaphragm 1 for a diaphragm pump, in particular a Dosiermembranpumpe, for conveying a fluid. Fig. 2 shows a sectional view through the pump membrane from FIG. 1. The pump membrane 1 comprises a plate-shaped, elastic membrane body 2 made of rubber with a circular functional region 8 and a peripheral clamping edge 6 revolving around a longitudinal axis A of the pump membrane 1. The longitudinal axis A runs through the center of the circular functional area 8 and parallel to the deflection direction of the Pumenpenmembranl. The pump diaphragm 1 is in the installed state with the clamping edge 6 in a pump housing for delimiting a pump chamber, in which flows the fluid to be pumped, kept sealed. In the embodiment shown, the clamping edge 6 is T-shaped in cross-section. Other shapes are also possible. Furthermore, the pump membrane 1 comprises a fixed core 3 which is at least partially embedded in the membrane body 2 and fluid side, ie. towards the pump room, completely covered by the membrane body 2. On the side facing away from the fluid, the core 3 has a connection device 4, which is operatively connected to the drive of the diaphragm pump for deflecting the pump diaphragm 1 along the longitudinal axis A.
Zur chemischen Verankerung des Kerns 3 im Membrankörper 2 ist der Kern 3 einstückig aus einem thermoplastischen Kunststoff gefertigt, welcher haftvermittlerfrei mit dem elastischen Membrankörper 2 aus Kautschuk kovalente Bindungen ausbildet. Der thermoplastische Kunststoff kann ein Polyamid 612 oder ein Polyphenylenether, insbesondere Poly-2,6-dimethyl- 1,4-phenylenether, sein, welches mit peroxidisch vernetztem Kautschuk, vorzugsweise peroxidisch vernetzter Ethylen-Propylen-Dien-Kautschuk (EPDM), kovalente Bindungen eingeht. Die kovalenten Bindungen entstehen während der Vulkanisierung des Kautschuks.  For chemical anchoring of the core 3 in the membrane body 2, the core 3 is made in one piece from a thermoplastic material which forms adhesive bonds with the elastic membrane body 2 made of rubber covalent bonds. The thermoplastic material may be a polyamide 612 or a polyphenylene ether, in particular poly-2,6-dimethyl-1,4-phenylene ether, which is covalent bonds with peroxide-crosslinked rubber, preferably peroxidically crosslinked ethylene-propylene-diene rubber (EPDM) received. The covalent bonds are formed during the vulcanization of the rubber.
Alternativ kann als Kautschuk ein Silikonkautschuk oder Fluor- Silikonkautschuk (MVQ/FMQV) und als Kunststoff ein Polybutylenterephthalat (PBT) verwendet werden.  Alternatively, as the rubber, a silicone rubber or fluoro-silicone rubber (MVQ / FMQV) and as a plastic, a polybutylene terephthalate (PBT) can be used.
Zur mechanischen Verankerung umfasst der Kern 3 eine Verankerungsplatte 5, welche an der fluidabgewandten Seite wenigstens teilweise vom Membrankörper 2 überdeckt ist. In der gezeigten Ausführungsform umfasst der Kern 3 weiter einen Zapfen 7, und die Anschlusseinrichtung 4 ist nicht direkt in der Verankerungsplatte 5 angeordnet sondern am fluidabgewandten Ende des Zapfens 7.  For mechanical anchoring, the core 3 comprises an anchoring plate 5, which is at least partially covered by the membrane body 2 on the fluid-remote side. In the embodiment shown, the core 3 further comprises a pin 7, and the connection device 4 is not arranged directly in the anchoring plate 5 but at the fluid-remote end of the pin. 7
Weiter ist in der gezeigten Ausführungsform die Anschlusseinrichtung 4 als separates Teil, z. B. in der Form eines Gewindeeinsatzes, im Kern fixiert. Der Kern 7 kann am fluidabgewandten Ende zudem mehrkantig ausgebildet sein, so dass er mit einem Gabelschüssel an einer Antriebstange festschraub bar ist.Further, in the embodiment shown, the connection device 4 as a separate part, for. B. in the form of a threaded insert, fixed in the core. The core 7 may also be formed polygonal at the fluid remote end, so that he is festschraub bar with a fork bowl on a drive rod.
Die Pumpenmembran 1 kann spritzgusstechnisch hergestellt sein, beispielsweise durch ein Zwei-Komponenten-Spritzgussverfahren, bei welchem erst der feste Kern 3und anschliessend der Membrankörper 2 gespritzt werden. Dabei kann eine metallische Anschlusseinrichtung 4, z.B. in Form eines Gewindeeinsatzes, direkt mit dem Kernmaterial umspritzt sein . The pump membrane 1 can be produced by injection molding, for example by a two-component injection molding process, in which first the solid core 3 and subsequently the membrane body 2 are injected become. In this case, a metallic connection device 4, for example in the form of a threaded insert, be molded directly with the core material.
Fig. 3 und Fig . 4 zeigen eine perspektivische Explosionsdarstellung auf die fluidabgewandte Seite resp. die fluidzugewandte Seite des festen Kerns 3. Fig . 5 zeigt eine perspektivische teilweise Schnittdarstellung der Pumpenmembran 1 aus Fig. 1 und 2 mit dem Kern aus Fig . 3 und 4. Die Verankerungsplatte 5 weist einen inneren Ring aus mehreren um die Längsachse A angeordneten inneren Durchgangsöffnungen 51 auf. Wie in Fig . 2 und in Fig . 5 erkennbar weisen die inneren Durchgangsöffnungen 51 zur mechanischen Verankerung des Kerns 3 im Membrankörper 2 jeweils einen umlaufenden Absatz auf, so dass sie fluidseitig verengt sind . Die inneren Durchgangsöffnungen 51 der Verankerungsplatte 5 sind bei der fertigen Pumpenmembran 1 vollständig mit dem Kautschuk des Membrankörpers ausgefühlt. Als zusätzliche mechanische Verankerung weist die Verankerungsplatte 5 weiter auf der fluidabgewandten Seite eine umlaufende Nut 52 auf, in welcher ein äusserer Ring aus mehreren äusseren Durchgangsöffnungen 53 angeordnet ist. Zudem wiest in der gezeigten Ausführungsform die äussere Wand 54 der Nut 52 eine geringer Höhe die innere Wand 55 der Nut 52 auf, so dass bei der fertigen Pumpenmembran 1 der Membrankörper 2 den peripheren Rand der Verankerungsplatte 5 mit dessen äusseren Wand 54 umschliesst und die Nut 52 zusammen mit den äusseren Durchgangsöffnungen 53 vollständig ausfüllt. Fig. 3 and Fig. 4 show a perspective exploded view of the fluid-remote side, respectively. the fluid-facing side of the fixed core 3. Fig. 5 shows a perspective, partially sectional view of the pump membrane 1 from FIGS. 1 and 2 with the core of FIG. 3 and 4. The anchoring plate 5 has an inner ring of a plurality of inner through holes 51 disposed about the longitudinal axis A. As shown in FIG. 2 and in FIG. 5, the inner passage openings 51 for the mechanical anchoring of the core 3 in the membrane body 2 each have a circumferential shoulder, so that they are narrowed on the fluid side. The inner passage openings 51 of the anchoring plate 5 are completely felt in the finished pump membrane 1 with the rubber of the membrane body. As an additional mechanical anchoring, the anchoring plate 5 further on the fluid side facing away from a circumferential groove 52, in which an outer ring of a plurality of outer through-holes 53 is arranged. In addition, in the embodiment shown, the outer wall 54 of the groove 52 has a small height, the inner wall 55 of the groove 52, so that in the finished pump membrane 1, the membrane body 2 encloses the peripheral edge of the anchoring plate 5 with its outer wall 54 and the groove 52 completely fills together with the outer through holes 53.
Weiter weist der Kern 3 eine fluidseitig eine zentrale Öffnung 31 auf, welche zusammen mit der Anschlusseinrichtung eine Sackloch ausbildet. In der fertigen Pumpenmembran 1 ist dieses Sackloch ebenfalls mit dem Kautschuk des Membrankörpers 2 ausgefüllt. Die beschrieben Strukturen des Kern 2 (Durchgangsöffnungen, Nut, Sackloch) führen alle zu einer Vergrösserung der Verbindungsfläche zwischen Kern 3 und Membrankörper 2, was insbesondere bei der voran beschriebenen chemischen Verankerung zu einer wesentlich dauerhafteren und stärkeren Befestigung des Kerns 3 im Membrankörper 2 führt. 1 Pumpenmembran Next, the core 3 has a fluid side, a central opening 31, which forms a blind hole together with the connection device. In the finished pump membrane 1, this blind hole is also filled with the rubber of the membrane body 2. The described structures of the core 2 (through holes, groove, blind hole) all lead to an enlargement of the connecting surface between the core 3 and membrane body 2, which leads to a much more durable and stronger attachment of the core 3 in the membrane body 2 in particular in the chemical anchoring described above. 1 pump diaphragm
2 Membrankörper  2 membrane bodies
3 Kern  3 core
4 Anschlusseinrichtung  4 connection device
5 Verankerungsplatte  5 anchoring plate
6 Einspannrand  6 clamping edge
7 Zapfen  7 cones
8 Funktionsbereich  8 functional area
31 zentrale Öffnung / zentrales Sackloch 31 central opening / central blind hole
51 innere Durchgangsöffnungen 51 internal passages
52 umlaufende Nut  52 circumferential groove
53 äussere Durchgangsöffnungen 53 outer passages
54 äussere Wand 54 outer wall
55 innere Wand  55 inner wall
A Längsachse  A longitudinal axis

Claims

Patentansprüche claims
Pumpenmembran (1) für eine Membranpumpe zur Förderung eines Fluides umfassend einen festen Kern (3) mit einer Anschlusseinrichtung (4) für eine Antriebsstange der Membranpumpe und einen tellerförmigen, elastischen Membrankörper (2) aus Kautschuk mit einem peripheren Einspannrand (6), wobei der feste Kern (3) wenigstens teilweise im Membrankörper (2) eingebettet ist, dadurch gekennzeichnet, dass der feste Kern (3) aus einem thermoplastischem Kunststoff gefertigt ist und haftvermittlerfrei mit dem elastischen Membrankörper (2) aus Kautschuk kovalente Bindungen ausbildet. Pump diaphragm (1) for a diaphragm pump for conveying a fluid comprising a solid core (3) with a connection device (4) for a drive rod of the diaphragm pump and a plate-shaped elastic membrane body (2) made of rubber with a peripheral clamping edge (6), wherein the solid core (3) is at least partially embedded in the membrane body (2), characterized in that the solid core (3) is made of a thermoplastic material and forms adhesion promoter-free with the elastic membrane body (2) made of rubber covalent bonds.
Pumpenmembran nach Anspruch 1, dadurch gekennzeichnet, dass der Kautschuk ein peroxidisch vernetzter Kautschuk ist, insbesondere peroxidisch vernetzter Ethylen-Propylen-Dien-Kautschuk (EPDM). Pump membrane according to claim 1, characterized in that the rubber is a peroxidically crosslinked rubber, in particular peroxidically crosslinked ethylene-propylene-diene rubber (EPDM).
Pumpenmembran nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Kunststoff ein Polyamid 612 oder ein Polyphenylenether, insbesondere Poly-2,6-dimethyl-l,4-phenylenether, ist. Pump membrane according to one of the preceding claims, characterized in that the plastic is a polyamide 612 or a polyphenylene ether, in particular poly-2,6-dimethyl-l, 4-phenylene ether.
Pumpenmembran nach Anspruch 1, dadurch gekennzeichnet, dass der Kautschuk ein Silikonkautschuk oder Fluor-Silikonkautschuk (MVQ/FMQV) und der Kunststoff ein Polybutylenterephthalat (PBT) ist. A pump membrane according to claim 1, characterized in that the rubber is a silicone rubber or fluoro-silicone rubber (MVQ / FMQV) and the plastic is a polybutylene terephthalate (PBT).
Pumpenmembran nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der feste Kern (3) eine tellerförmige Verankerungsplatte (5) umfasst, wobei die Verankerungsplatte (5) mehreren ringförmig um die Längsachse (A) der Pumpenmembran (1) angeordnete Durchgangsöffnungen (51) aufweist, die von der fluidabgewandten Seite in Richtung der fluidzugewandten Seite gesehen jeweils eine Verengung des Querschnitts aufweisen. Pump diaphragm according to one of the preceding claims, characterized in that the fixed core (3) comprises a plate-shaped anchoring plate (5), wherein the anchoring plate (5) a plurality of annularly around the longitudinal axis (A) of the pump diaphragm (1) arranged through openings (51) which, viewed from the fluid-remote side in the direction of the fluid-facing side each have a constriction of the cross section.
Pumpenmembran nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der feste Kern (3) eine tellerförmige Verankerungsplatte (5) umfasst, wobei die Verankerungsplatte (5) an der fluidabgewandten Seite eine ringförmige Nut (52) aufweist und in der Nut (52) mehrere Durchgangsöffnungen (53) angeordnet sind. Pump diaphragm according to one of the preceding claims, characterized in that the fixed core (3) comprises a plate-shaped anchoring plate (5), wherein the anchoring plate (5) on the fluid-remote side has an annular groove (52) and in the groove (52) a plurality Through openings (53) are arranged.
Pumpenmembran nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der feste Kern (3) einen Zapfen (7) aufweist, an dessen fluidabgewandten Ende die Anschlusseinrichtung (4) angeordnet ist. Pump diaphragm according to one of the preceding claims, characterized in that the fixed core (3) has a pin (7), at the fluid-remote end of the connection device (4) is arranged.
Pumpenmembran nach Anspruch 7, dadurch gekennzeichnet, dass der Zapfen (6) an der fluidzugewandten Seite ein zentrales Sackloch (31) aufweist. Pump diaphragm according to claim 7, characterized in that the pin (6) on the fluid-facing side has a central blind hole (31).
Pumpenmembran nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Anschlusseinrichtung (4) ein metallischer Gewindeeinsatz ist. Pump diaphragm according to one of the preceding claims, characterized in that the connection device (4) is a metallic threaded insert.
EP17772683.3A 2016-09-29 2017-09-21 Pump diaphragm Active EP3519696B1 (en)

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CH01282/16A CH712963A1 (en) 2016-09-29 2016-09-29 Pump diaphragm for a diaphragm pump for conveying a fluid.
PCT/EP2017/073841 WO2018060034A1 (en) 2016-09-29 2017-09-21 Pump diaphragm

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CN208934890U (en) * 2018-10-27 2019-06-04 东莞市茗创优尚电子科技有限公司 A kind of resilient membrane type pump housing
DE102020125567A1 (en) * 2020-09-30 2022-03-31 Ulman Dichtungstechnik Gmbh Composite diaphragm for diaphragm pumps

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DE29612117U1 (en) 1996-07-11 1996-09-12 ASF THOMAS Industries GmbH, 82178 Puchheim Diaphragm for a diaphragm pump
DE19829084B4 (en) * 1998-06-30 2005-01-13 Prominent Dosiertechnik Gmbh diaphragm pump
DE10058274A1 (en) * 2000-11-23 2002-05-29 Alfa Laval Flow Gmbh Membrane is provided with a surface structure formed by two families of crossing grooves or beads oriented at angles within a specified range to the radii drawn through the respective crossing points
DE10323059A1 (en) 2003-05-20 2004-12-09 Prominent Dosiertechnik Gmbh sensor diaphragm
DE502006005200D1 (en) 2006-07-21 2009-12-03 Ulman Dichtungstechnik Gmbh composite membrane
DE102010009670B4 (en) 2010-02-27 2013-09-19 Knf Neuberger Gmbh diaphragm pump
US8496451B2 (en) 2010-06-21 2013-07-30 Wilden Pump And Engineering Llc Pump diaphragm
US10422331B2 (en) * 2016-08-12 2019-09-24 Ingersoll-Rand Company One piece diaphragm

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US10900478B2 (en) 2021-01-26
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US20190226469A1 (en) 2019-07-25
WO2018060034A1 (en) 2018-04-05

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