EP0055467A1 - Diaphragm pump with a pressure relieved diaphragm - Google Patents

Diaphragm pump with a pressure relieved diaphragm Download PDF

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Publication number
EP0055467A1
EP0055467A1 EP81110720A EP81110720A EP0055467A1 EP 0055467 A1 EP0055467 A1 EP 0055467A1 EP 81110720 A EP81110720 A EP 81110720A EP 81110720 A EP81110720 A EP 81110720A EP 0055467 A1 EP0055467 A1 EP 0055467A1
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EP
European Patent Office
Prior art keywords
pressure
membrane
chamber
diaphragm
pressure chamber
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
EP81110720A
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German (de)
French (fr)
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EP0055467B1 (en
Inventor
Horst Dipl.-Ing. Fritsch
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Lewa GmbH
Lewa Herbert Ott GmbH and Co KG
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Lewa GmbH
Lewa Herbert Ott GmbH and Co KG
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Application filed by Lewa GmbH, Lewa Herbert Ott GmbH and Co KG filed Critical Lewa GmbH
Priority to AT81110720T priority Critical patent/ATE10670T1/en
Publication of EP0055467A1 publication Critical patent/EP0055467A1/en
Application granted granted Critical
Publication of EP0055467B1 publication Critical patent/EP0055467B1/en
Expired legal-status Critical Current

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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/06—Pumps having fluid drive
    • F04B43/067—Pumps having fluid drive the fluid being actuated directly by a piston

Definitions

  • the invention relates to a diaphragm pump according to the preamble of claim 1.
  • diaphragm pumps of this type which operate with a hydraulic diaphragm drive
  • two basic constructions are known in principle, namely on the one hand those in which one or more plastic diaphragms are used and on the other hand those in which metal diaphragms are used.
  • the diaphragm clamping which is achieved by the peripheral edge of the diaphragm clamped between the housing body and the pump cover, acts at the same time in such a diaphragm pump as a seal from the pressure chamber to the atmosphere, so that such a construction can only achieve delivery pressures of up to 350 bar, since the Tightness of the diaphragm pump must also be ensured with critical media, such as toxic or abrasive dosing media.
  • diaphragm pump constructions of the other type mentioned above namely those with metal diaphragms, must be used for the desired higher delivery pressures of over 350 bar.
  • metal membranes naturally only allow small deflections and therefore require a much larger membrane bending diameter than plastic membranes.
  • the highest demands are placed on the processing quality of the sealing surfaces, namely on the clamping surface of the metal membrane, and on the surface quality of the membrane material.
  • Diaphragm pumps with metal diaphragms are therefore much larger and more expensive than those with plastic diaphragms.
  • operational reliability is lower because metal membranes are more sensitive to breakage, e.g. B. can easily be brought about by suspension or dirt particles in the medium.
  • the invention is therefore based on the object of designing the diaphragm pump of the generic type in order to eliminate the disadvantages described in such a way that it is suitable for delivery pressures of well over 350 bar and at the same time permits the use of reliable, displacement-intensive plastic membranes.
  • the invention is based on the idea of relieving the clamping surface of the membrane of the sealing function which it had previously had to perform simultaneously, i.e. So the membrane is relieved of pressure with a precisely defined deformation between the pump cover and the housing body in such a way that the same pressure, namely that of the pressure chamber, always prevails both radially inside and radially outside the membrane clamping surface.
  • This results in the significant advantage that not only does the membrane clamping surface no longer have to perform any sealing function, but that a plastic membrane can also be used if the membrane pump is to achieve delivery pressures of well over 350 bar, which are already compared to the metal membrane Advantages described, namely u. a. high displacement intensity, notch sensitivity, long service life, small diameter, etc., has.
  • the pressure chamber is sealed off from the atmosphere by a separate seal, such a seal being designed without any problems because only hydraulic fluid, usually mineral oil, has to be sealed.
  • a separate seal such a seal being designed without any problems because only hydraulic fluid, usually mineral oil, has to be sealed.
  • the previously difficult task of securely sealing volatile, aggressive or toxic fluids at high pulsating pressures is reduced to a technically simple and proven solution, namely the sealing of oil at pulsating pressure.
  • Known sealing elements e.g. B. O-rings can be used.
  • a circumferential pressure compensation space in particular in the form of an annular groove in the end face of the housing body, is provided radially outside the membrane clamping surface and is connected to the pressure space via at least one connecting channel.
  • this connecting channel can either be connected directly to the pressure chamber or can be guided to a blind bore in the housing body, which receives a snift valve arrangement connected to the hydraulic supply and is in turn connected to the pressure chamber via a further channel.
  • the pressure compensation chamber including its connecting channel in one piece with the pressure chamber by designing the pressure chamber to be correspondingly large in the radial direction and so that it extends radially outside beyond the diaphragm clamping surface.
  • the clamping surface of the membrane is then attached to the end face of the pump cover with a separate clamping ring arranged in the pressure chamber, this clamping ring advantageously being designed as a perforated plate and thus serving to support the membrane in the bottom dead center position during the suction stroke of the displacement piston.
  • the diaphragm pump shown has a pump housing in the form of a housing body 2 which is closed at the end by a pump cover 1 and in which an oscillating displacement piston 3 operates as a hydraulic diaphragm drive. This can be pushed mechanically back and forth in an axial bore 4 of the housing body 2 and is sealed off from a hydraulic supply 6 by a packing 5.
  • the pump cover 1 is detachably fixed on the end face on the housing body 2 by screws 7, a delivery chamber 8 and a pressure chamber 9 filled with hydraulic fluid being formed in the mutually facing end faces of the pump cover 1 and the housing body 2 by correspondingly large, diameter-concave recesses.
  • the pressure chamber 9, which opens at the bottom in the middle into the bore 4 of the housing body 2, which displaceably guides the displacer piston 3, is separated from the delivery chamber 8 by a plastic membrane 10, which in the exemplary embodiment shown consists of a single membrane, but can also be formed from a plurality of membranes, one on top of the other, in a sandwich-like manner and in any case is firmly clamped between the pump cover 1 and the housing body 2 in the manner described below.
  • the pump cover 1 has a spring-loaded inlet valve 11 and a spring-loaded outlet valve 12, these valves 11, 12 being connected to the delivery chamber 8 via an inlet channel 13 and an outlet channel 14 in such a way that the delivery medium takes place to the right according to FIG. 1 Suction stroke of the diaphragm 10 in the direction of arrow A via the inlet valve 11 and the inlet channel 13 sucked into the delivery chamber 8 and metered out during the pressure stroke of the membrane 10 to the left according to FIG. 1 via the outlet channel 14 and the outlet valve 12 in the direction of arrow B. the delivery chamber 8 is pushed out.
  • an overflow valve 15 serving to protect against overpressure is provided in the housing body 2 15 ', the blind bore 16 being connected to the hydraulic reservoir 6 by a duct 18 and to the pressure chamber 9 by a duct 19.
  • the pressure chamber 9 is then connected to the hydraulic reservoir 6 via the channels 19, 18 and depressurized if an inadmissibly high pressure should be built up in the pressure chamber 9 during the pressure stroke of the membrane 10.
  • a snifting valve 21 is accommodated in a further blind bore 20 of the housing body 2, which for the purpose of the vacuum protection when the diaphragm 10 is in contact with the pressure chamber during the diaphragm suction stroke releases the connection of the pressure chamber 9 to the hydraulic supply 6.
  • the blind bore 20 is connected via a channel 22 to the pressure chamber 9 and via a channel 23 to the hydraulic reservoir 6, the snifting valve 21 in the manner shown having a spring-loaded valve ball 25 resting on the underside of the bottom of an insert body 24, which at Reaches a certain preset negative pressure and accordingly connects the pressure chamber 9 to the hydraulic supply 6 via the channels 22, 23.
  • this sniffer valve 21 also serves to vent the pressure chamber 9, ie. H. the degassing of the hydraulic fluid in the pressure chamber 9.
  • the channel 22 in the housing body 2 is designed to rise, in such a way that its geodetically lower end (left channel end in FIG. 1) with the geodetically highest point of the pressure chamber 9 and its geodetically higher end (right channel end in Fig. 1) is connected to the blind bore 20, so that a reliable degassing of the hydraulic fluid or venting of the pressure chamber 9 is always automatically achieved.
  • the membrane 10 with a clamping surface 26 formed by its peripheral edge is firmly clamped between those parts of the mutually facing end faces of the housing body 2 and pump cover 1 which are connected to the delivery chamber 8 and the pressure chamber 9 adjoin, this membrane clamping surface 26 being inserted into an annular recess 27 formed in the end face of the housing body 2.
  • a circumferential pressure compensation chamber 28 is provided in the end face of the housing body 2, which has the shape of an annular groove and in the illustrated Embodiment via a single connection channel 29 formed in the housing body 2 is connected to the blind bore 20 receiving the snifting valve 21 - and thus via the channel 22 to the pressure chamber 9.
  • the connecting channel 29 - like the channel 22 - is also designed to rise in the housing body 2 and is designed such that it extends from the geodetically highest point of the pressure compensation chamber 28 to the geodetically highest point of the pressure chamber 9 - namely via the blind bore 20 and the channel 22 - leads, so that this also ensures a safe degassing of the pressure compensation chamber 28 ge.
  • the diaphragm 10 is fixed with its clamping surface 26 by a separate clamping ring 32 by means of screws 33 on the end face of the pump cover 1, this clamping ring 32 being designed as a perforated plate having a plurality of axially parallel through bores 34 which a perfect membrane support is guaranteed at the membrane suction stroke and is accommodated in the pressure chamber 9 '.
  • the pressure chamber 9 ' is larger in diameter than the delivery chamber 8 and is accordingly designed such that it is in extends radially beyond the membrane clamping surface 26.
  • annular space 28 ' is formed radially outside of the diaphragm clamping surface 26' in the pressure chamber 9 ', which represents the pressure compensation chamber connected in one piece to the pressure chamber 9' and ensures that the same pressure always prevails both radially outside and radially inside the diaphragm clamping surface 26 . Due to this special - enlarged - design of the pressure chamber 9 ', it is not necessary that the annular space 28' representing the pressure compensation chamber is still connected to the pressure chamber 9 'via a separate connecting channel (similar to the connecting channel 29 according to FIGS. 1 and 2); In other words, this means that the separate connecting duct including the pressure compensation space 28 'forms part of the pressure space 9' itself.
  • the ring seal 30 is also provided radially outside the pressure equalization chamber 28 between the abutting end faces of the housing body 2 and the pump cover 1, which seal seals in the pressure chamber 9 'or in the pressure equalization chamber 28'. hydraulic fluid located outside seals.
  • the further modified embodiment according to FIG. 4 differs from that according to FIGS. 1 and 2 only in that the membrane 10 additionally has an outer edge 26 ′ on its clamping surface 26, which has a considerably smaller thickness than the membrane main body, the thickness this outer clamping edge 26 'is preferably about 5-20% of the thickness of the membrane main body.
  • the width of the outer clamping edge 26 ' should be at least 10 times its thickness.
  • the thinned outer clamping edge 26 has the advantage of an even greater sealing and clamping security. It can namely, especially when the diaphragm pump is at a standstill, that the pressure in the delivery chamber 8 becomes greater than in the pressure chamber 9, for example if the outlet valve 12 is stuck or if its spring breaks, etc. In such a malfunction the diaphragm 10 - Similar to their movement during the suction stroke - deflected and pressed against the concave support surface of the pressure chamber 9, the clamping edge of the membrane 10 formed by the usual clamping surface 26 being excessively stressed.

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

Abstract

In a diaphragm pump the diaphragm separating the delivery chamber from the working chamber is clamped between a cylinder body and a cylinder cover in pressure-balancing arrangement. For this purpose a pressure-balancing space is provided to be radially outside and to encircle said diaphragm clamping surface, the pressure balancing space communicating wtih the working chamber through at least one communicating passage. Furthermore, a separate annular seal member is disposed to be radially outside the pressure balancing space chamber between the cylinder cover and the cylinder body to seal-off the pressure balancing space and the working chamber from the outside. This enables the diaphragm pump to be used at discharge pressures far greater than 350 bars and simultaneously permits the use of plastic diaphragms which are reliable in operation and have a large displacement capacity.

Description

Die Erfindung betrifft eineMembranpumpe gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a diaphragm pump according to the preamble of claim 1.

Bei bekannten Membranpumpen dieser Art, die mit hydraulischem Membranantrieb arbeiten, sind grundsätzlich zwei Basiskonstruktionen bekannt, nämlich einerseits solche, bei denen eine oder mehrere Kunststoffmembranen zur Anwendung gelangen, und andererseits solche, bei denen Metallmembranen verwendet werden.In known diaphragm pumps of this type, which operate with a hydraulic diaphragm drive, two basic constructions are known in principle, namely on the one hand those in which one or more plastic diaphragms are used and on the other hand those in which metal diaphragms are used.

Bei denjenigen bekannten Membranpumpenkonstruktionen, bei denen eine Kunstoffmembran, üblicherweise aus Polytetrafluoräthylen (PTFE) oder Elastomeren bestehend, zur Anwendung gelangt, ergibt sich der Vorteil einer kompakten, preisgünstigen und sehr betriebssicheren Ausführung, so daß diese heute hauptsächlich eingesetzt wird. Dies beruht darauf, daß eine Kunststoffmembran naturgemäß eine hohe Elastizität aufweist und daher sehr große Auslenkungen sowie kleine Durchmesser gestattet, so daß durch die Unempfindlichkeit der Kunststoffmembran gegen Oberflächenbeschädigungen und auch bei schwierigen Fördermedien, wie z. B. Suspensionen, eine sehr hohe Betriebssicherheit erreicht wird, die sich in einer Membranlebensdauer von mehr als 20. 000 Betriebsstunden äußert.In those known diaphragm pump constructions in which a plastic membrane, usually made of polytetrafluoroethylene (PTFE) or elastomers, is used, there is the advantage of a compact, inexpensive and very reliable design, so that it is mainly used today. This is due to the fact that a plastic membrane naturally has a high elasticity and therefore allows very large deflections and small diameters, so that the plastic membrane is insensitive to surface damage and also with difficult conveying media, such as, for. B. suspensions, a very high level of operational reliability is achieved, which manifests itself in a membrane life of more than 20,000 operating hours.

Die Membraneinspannung, die durch den zwischen Gehäusekörper und Pumpendeckel festgeklemmten Umfangsrand der Membran erreicht wird, wirkt aber bei einer derartigen Membranpumpe gleichzeitig als Abdichtung des Druckraumes zur Atmosphäre hin, so daß sich mit einer derartigen Konstruktion nur Förderdrücke bis maximal 350 bar erreichen lassen, da die Dichtheit der Membranpumpe auch bei kritischen Fördermedien, wie beispielsweise giftigen oder abrasiven Dosiermedien, gewährleistet sein muß.The diaphragm clamping, which is achieved by the peripheral edge of the diaphragm clamped between the housing body and the pump cover, acts at the same time in such a diaphragm pump as a seal from the pressure chamber to the atmosphere, so that such a construction can only achieve delivery pressures of up to 350 bar, since the Tightness of the diaphragm pump must also be ensured with critical media, such as toxic or abrasive dosing media.

Es müssen demgemäß für gewünschte höhere Förderdrücke von über 350 bar Membranpumpenkonstruktionen der obengenannten anderen Art, nämlich solche mit Metallmembranen, eingesetzt werden. Metallmembranen lassen jedoch naturgemäß nur kleine Auslenkungen zu und erfordern deshalb einen wesentlich größeren Membranbiegedurchmesser als Kunststoffmembranen. Außerdem werden höchste.Anforderungen an die Bearbeitungsgüte der Dichtflächen, nämlich an die Einspannfläche der Metallmembran, sowie an die Oberflächengüte des Membranmaterials gestellt. Entsprechend dem größeren Durchmesser der Metallmembran ergeben sich auch höhere Kräfte für die Schrauben der Membraneinspannung. Membranpumpen mit Metallmembranen sind deshalb sehr viel größer und teurer als solche mit Kumststoffmembranen. Zudem ist die Betriebssicherheit geringer, weil Metallmembranen empfindlicher gegen Bruch sind, der z. B. leicht durch Suspensions-oder Schmutzpartikel im Fördermedium herbeigeführt werden kann.Accordingly, diaphragm pump constructions of the other type mentioned above, namely those with metal diaphragms, must be used for the desired higher delivery pressures of over 350 bar. However, metal membranes naturally only allow small deflections and therefore require a much larger membrane bending diameter than plastic membranes. In addition, the highest demands are placed on the processing quality of the sealing surfaces, namely on the clamping surface of the metal membrane, and on the surface quality of the membrane material. Corresponding to the larger diameter of the metal membrane, there are also higher forces for the screws of the membrane clamping. Diaphragm pumps with metal diaphragms are therefore much larger and more expensive than those with plastic diaphragms. In addition, operational reliability is lower because metal membranes are more sensitive to breakage, e.g. B. can easily be brought about by suspension or dirt particles in the medium.

Der Erfindung liegt daher die Aufgabe zugrunde, die Membranpumpe der gattungsgemäßen Art zur Beseitigung der geschilderten Nachteile derart auszugestalten, daß sie sich für Förderdrücke von weit über 350 bar eignet und gleichzeitig den Einsatz von betriebssicheren, verdrängungsintensiven Kunststoffmembranen erlaubt.The invention is therefore based on the object of designing the diaphragm pump of the generic type in order to eliminate the disadvantages described in such a way that it is suitable for delivery pressures of well over 350 bar and at the same time permits the use of reliable, displacement-intensive plastic membranes.

Diese Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst. Vorteilhafte Ausgestaltungen hiervon sind in den weiteren Ansprüchen angegeben.This object is solved by the features of claim 1. Advantageous refinements of this are specified in the further claims.

Der Erfindung liegt der Gedanke zugrunde, die Einspannfläche der Membran von der Dichtfunktion, die sie bisher gleichzeitig übernehmen mußte, zu entlasten, d.h. also die Membran druckentlastet mit genau definierter Verformung zwischen Pumpendeckel und Gehäusekörper derart einzuspannen, daß sowohl radial innerhalb wie radial außerhalb der Membraneinspannfläche stets der gleiche Druck, nämlich derjenige des Druckraums, herrscht. Dadurch ergibt sich der bedeutende Vorteil, daß nicht nur die Membraneinspannfläche keinerlei Dichtfunktion mehr übernehmen muß, sondern daß auch dann, wenn mit der Membranpumpe Förderdrücke von weit über 350 bar erzielt werden sollen, eine Kunststoffmembran zur Anwendung gelangen kann, die gegenüber der Metallmembran die bereits geschilderten Vorteile, nämlich u. a. große Verdrängungsintensität, Kerbunempfindlichkeit, hohe Lebensdauer, kleinen Durchmesser usw. , aufweist.The invention is based on the idea of relieving the clamping surface of the membrane of the sealing function which it had previously had to perform simultaneously, i.e. So the membrane is relieved of pressure with a precisely defined deformation between the pump cover and the housing body in such a way that the same pressure, namely that of the pressure chamber, always prevails both radially inside and radially outside the membrane clamping surface. This results in the significant advantage that not only does the membrane clamping surface no longer have to perform any sealing function, but that a plastic membrane can also be used if the membrane pump is to achieve delivery pressures of well over 350 bar, which are already compared to the metal membrane Advantages described, namely u. a. high displacement intensity, notch sensitivity, long service life, small diameter, etc., has.

Bei der erfindungsgemäß ausgestalteten Membranpumpe erfolgt die Abdichtung des Druckraums zur Atmosphäre hin durch eine gesonderte Dichtung, wobei sich eine derartige Abdichtung problemlos gestaltet, weil lediglich Hydraulikflüssigkeit, in der Regel Mineralöl, abzudichten ist. Somit wird die bisher schwierige Aufgabe einer sicheren Abdichtung leichtflüchtiger, aggressiver oder giftiger Fördermedien bei hohen pulsierenden Drücken auf eine technisch einfache und bewährte Lösung reduziert, nämlich der Abdichtung von Öl bei pulsierendem Druck. Dafür können bekannte Dichtelemente, z. B. O-Ringe, verwendet werden.In the diaphragm pump designed according to the invention, the pressure chamber is sealed off from the atmosphere by a separate seal, such a seal being designed without any problems because only hydraulic fluid, usually mineral oil, has to be sealed. The previously difficult task of securely sealing volatile, aggressive or toxic fluids at high pulsating pressures is reduced to a technically simple and proven solution, namely the sealing of oil at pulsating pressure. Known sealing elements, e.g. B. O-rings can be used.

Um den der Erfindung zugrundeliegenden Gedanken, nämlich sowohl radial innerhalb wie radial außerhalb der Membraneinspannfläche stets den gleichen Druck herrschen zu lassen, praktisch zu verwirklichen, ist gemäß einer bevorzugten Ausführungsform radial außerhalb der Membraneinspannfläche ein umlaufender Druckausgleichsraum, insbesondere in Form einer Ringnut in der Stirnfläche des Gehäusekörpers, vorgesehen, der über wenigstens einen Verbindungskanal mit dem Druckraum in Verbindung steht. Hierbei kann dieser Verbindungskanal entweder direkt mit dem Druckraum verbunden oder aber zu einer Sackbohrung im Gehäusekörper geführt sein, die eine mit dem Hydraulikvorrat in Verbindung stehende Schnüffelventilanordnung aufnimmt und ihrerseits über einen weiteren Kanal mit dem Druckraum verbunden ist.For the concept on which the invention is based, namely both radially inside and radially outside the membrane clamping surface To always allow the same pressure to prevail, to implement it in a preferred embodiment, a circumferential pressure compensation space, in particular in the form of an annular groove in the end face of the housing body, is provided radially outside the membrane clamping surface and is connected to the pressure space via at least one connecting channel. In this case, this connecting channel can either be connected directly to the pressure chamber or can be guided to a blind bore in the housing body, which receives a snift valve arrangement connected to the hydraulic supply and is in turn connected to the pressure chamber via a further channel.

Um beidseits der Membraneinspannfläche stets den gleichen Druck herrschen zu lassen und damit diese Membraneinspannfläche von der Dichtfunktion zu entlasten, ist es stattdessen auch möglich, den Druckausgleichsraum einschließlich seines Verbindungskanals dadurch einstückig mit dem Druckraum auszubilden, daß der Druckraum in radialer Richtung entsprechend groß ausgebildet ist und damit bis radial außerhalb über die Membraneinspannfläche hinaus reicht. Bei einer derartigen Ausbildung ist dann die Einspannfläche der Membran mit einem gesonderten, im Druckraum angeordneten Spannring an der Stirnfläche des Pumpendeckels befestigt, wobei dieser Spannring zweckmäßigerweise als Lochplatte ausgebildet ist und damit zur Abstützung der Membran in der unteren Totpunktlage während des Saughubes des Verdrängerkolbens dient.In order to always allow the same pressure to prevail on both sides of the membrane clamping surface and thus relieve this membrane clamping surface of the sealing function, it is instead also possible to form the pressure compensation chamber including its connecting channel in one piece with the pressure chamber by designing the pressure chamber to be correspondingly large in the radial direction and so that it extends radially outside beyond the diaphragm clamping surface. With such a design, the clamping surface of the membrane is then attached to the end face of the pump cover with a separate clamping ring arranged in the pressure chamber, this clamping ring advantageously being designed as a perforated plate and thus serving to support the membrane in the bottom dead center position during the suction stroke of the displacement piston.

Insgesamt lassen sich daher bei der erfindungsgemäß ausgestalteten Membranpumpe betriebssichere, verdrängungsintensive Kunststoffmembranen einsetzen und gleichzeitig Förderdrücke von bis zu beispielsweise 1200 bar bei einer Membranlebensdauer bis über 20. 000 Betriebsstunden erzielen.Overall, therefore, reliable, displacement-intensive plastic membranes can be used in the membrane pump designed according to the invention and, at the same time, delivery pressures of up to, for example, 1200 bar can be achieved with a membrane service life of over 20,000 operating hours.

Die Erfindung wird im folgenden anhand der Zeichnung näher erläutert. Diese zeigt in:

  • Fig. 1 schematisch im Querschnitt die Membranpumpe gemäß der Erfindung;
  • Fig. 2 vergrößert im Schnitt das Detail A der Membranpumpe gemäß Fig. 1;
  • Fig. 3 im Querschnitt eine abgewandelte Ausführungsform der Membranpumpe und
  • Fig. 4 eine weitere abgewandelte Ausführungsform in einer der Fig. 2 ähnlichen Detaildarstellung.
The invention is explained in more detail below with reference to the drawing. This shows in:
  • Figure 1 shows schematically in cross section the diaphragm pump according to the invention.
  • FIG. 2 shows, in section, detail A of the diaphragm pump according to FIG. 1;
  • Fig. 3 in cross section a modified embodiment of the diaphragm pump and
  • Fig. 4 shows a further modified embodiment in a detail view similar to Fig. 2.

Wie aus Fig. 1 ersichtlich, weist die dargestellte Membranpumpe ein Pumpengehäuse in Form eines durch einen Pumpendeckel 1 stirnseitig verschlossenen Gehäusekörpers 2 auf, in dem als hydraulischer Membranantrieb ein oszillierender Verdrängerkolben 3 arbeitet. Dieser ist in einer axialen Bohrung 4 des Gehäusekörpers 2 mechanisch hin- und herverschiebbar und durch eine Dichtungspackung 5 gegenüber einem Hydraulikvorrat 6 abgedichtet.As can be seen from FIG. 1, the diaphragm pump shown has a pump housing in the form of a housing body 2 which is closed at the end by a pump cover 1 and in which an oscillating displacement piston 3 operates as a hydraulic diaphragm drive. This can be pushed mechanically back and forth in an axial bore 4 of the housing body 2 and is sealed off from a hydraulic supply 6 by a packing 5.

Der Pumpendeckel 1 ist durch Schrauben 7 stirnseitig am Gehäusekörper 2 lösbar festgelegt, wobei in den einander zugekehrten Stirnflächen des Pumpendeckels 1 und des Gehäusekörpers 2 durch entsprechend große, durchmessergleiche konkave Ausnehmungen ein Förderraum 8 sowie ein mit Hydraulikflüssigkeit gefüllter Druckraum 9 gebildet ist. Der Druckraum 9, der an seinem Boden mittig in die den Verdrängerkolben 3 verschiebbar führende Bohrung 4 des Gehäusekörpers 2 mündet, ist vom Förderraum 8 durch eine Kunststoffmembran 10 getrennt, die beim dargestellten Ausführungsbeispiel aus einer einzigen Membran besteht, jedoch auch aus mehreren, sandwichartig übereinandergelegten Membranen-gebildet sein kann und in jedem Fall in der nachstehend beschriebenen Weise fest zwischen Pumpendeckel 1 und Gehäusekörper 2 eingespannt ist.The pump cover 1 is detachably fixed on the end face on the housing body 2 by screws 7, a delivery chamber 8 and a pressure chamber 9 filled with hydraulic fluid being formed in the mutually facing end faces of the pump cover 1 and the housing body 2 by correspondingly large, diameter-concave recesses. The pressure chamber 9, which opens at the bottom in the middle into the bore 4 of the housing body 2, which displaceably guides the displacer piston 3, is separated from the delivery chamber 8 by a plastic membrane 10, which in the exemplary embodiment shown consists of a single membrane, but can also be formed from a plurality of membranes, one on top of the other, in a sandwich-like manner and in any case is firmly clamped between the pump cover 1 and the housing body 2 in the manner described below.

Der Pumpendeckel 1 weist ein federbelastetes Einlaßventil 11 sowie ein federbelastetes Auslaßventil 12 auf, wobei diese Ventile 11, 12 derart über einen Einlaßkanal 13 bzw. einen Auslaßkanal 14 mit dem Förderraum 8 in Verbindung stehen, daß das Fördermedium beim nach rechts gemäß Fig. 1 erfolgenden Saughub der Membran 10 in Richtung des Pfeils A über das Einlaßventil 11 und den Einlaßkanal 13 in den Förderraum 8 angesaugt und beim nach links gemäß Fig. 1 erfolgenden Druckhub der Membran 10 über den Auslaßkanal 14 und das Auslaßventil 12 in Richtung des Pfeils B dosiert aus dem Förderraum 8 herausgedrückt wird.The pump cover 1 has a spring-loaded inlet valve 11 and a spring-loaded outlet valve 12, these valves 11, 12 being connected to the delivery chamber 8 via an inlet channel 13 and an outlet channel 14 in such a way that the delivery medium takes place to the right according to FIG. 1 Suction stroke of the diaphragm 10 in the direction of arrow A via the inlet valve 11 and the inlet channel 13 sucked into the delivery chamber 8 and metered out during the pressure stroke of the membrane 10 to the left according to FIG. 1 via the outlet channel 14 and the outlet valve 12 in the direction of arrow B. the delivery chamber 8 is pushed out.

Um beim Membrandruckhub eine Überlastung der Membran 10 sowie der gesamten Membranpumpe zu verhindern, ist im Gehäusekörper 2 ein dem Überdruckschutz dienendes Überströmventil 15 vorgesehen, das eine bodenseitig in einer Sackbohrung 16 des Gehäusekörpers 2 angeordnete, in der dargestellten Weise durch eine einstellbare Feder 17 belastete Ventilkugel 15' aufweist, wobei die Sackbohrung 16 durch einen Kanal 18 mit dem Hydraulikvorrat 6 sowie durch einen Kanal 19 mit dem Druckraum 9 verbunden ist. Wie ersichtlich, wird aufgrund dieser Anordnung und Ausbildung des Überströmventils 15 der Druckraum 9 dann über die Kanäle 19, 18 mit dem Hydraulikvorrat 6 verbunden und druckentlastet, wenn während des Druckhubes der Membran 10 ein unzulässig hoher Druck im Druckraum 9 aufgebaut werden sollte.In order to prevent the diaphragm 10 and the entire diaphragm pump from being overloaded during the diaphragm pressure stroke, an overflow valve 15 serving to protect against overpressure is provided in the housing body 2 15 ', the blind bore 16 being connected to the hydraulic reservoir 6 by a duct 18 and to the pressure chamber 9 by a duct 19. As can be seen, due to this arrangement and design of the overflow valve 15, the pressure chamber 9 is then connected to the hydraulic reservoir 6 via the channels 19, 18 and depressurized if an inadmissibly high pressure should be built up in the pressure chamber 9 during the pressure stroke of the membrane 10.

In entsprechender Weise ist in einer weiteren Sackbohrung 20 des Gehäusekörpers 2 ein Schnüffelventil 21 aufgenommen, das zum Zweck des Unterdruckschutzes bei der druckraumseitigen Anlage der Membran 10 während des Membransaughubes die Verbindung des Druckraumes 9 zum Hydraulikvorrat 6 freigibt. Zu diesem Zweck ist die Sackbohrung 20 über einen Kanal 22 mit dem Druckraum 9 sowie über einen Kanal 23 mit dem Hydraulikvorrat 6 verbunden, wobei das Schnüffelventil 21 in der dargestellten Weise eine federbelastete, unterseitig dem Boden eines Einsatzkörpers 24 anliegende Ventilkugel 25 aufweist, die bei Erreichen eines bestimmten voreingestellten Unterdrucks abhebt und demgemäß über die Kanäle 22, 23 die Verbindung des Druckraums 9 mit dem Hydraulikvorrat 6 herstellt.In a corresponding manner, a snifting valve 21 is accommodated in a further blind bore 20 of the housing body 2, which for the purpose of the vacuum protection when the diaphragm 10 is in contact with the pressure chamber during the diaphragm suction stroke releases the connection of the pressure chamber 9 to the hydraulic supply 6. For this purpose, the blind bore 20 is connected via a channel 22 to the pressure chamber 9 and via a channel 23 to the hydraulic reservoir 6, the snifting valve 21 in the manner shown having a spring-loaded valve ball 25 resting on the underside of the bottom of an insert body 24, which at Reaches a certain preset negative pressure and accordingly connects the pressure chamber 9 to the hydraulic supply 6 via the channels 22, 23.

Gleichzeitig dient dieses Schnüffelventil 21 auch der Entlüftung des Druckraumes 9, d. h. der Entgasung der im Druckraum 9 befindlichen Hydraulikflüssigkeit. Zu diesem Zweck ist der Kanal 22 im Gehäusekörper 2 ansteigend verlaufend ausgebildet, und zwar derart, daß sein geodätisch tiefer liegendes Ende (linkes Kanalende in Fig. 1) mit der geodätisch höchsten Stelle des Druckraums 9 und sein geodätisch höher liegendes Ende (rechtes Kanalende in Fig. 1) mit der Sackbohrung 20 verbunden ist, so daß stets selbsttätig eine funktionssichere Entgasung der Hydraulikflüssigkeit bzw. Entlüftung des Druckraums 9 erreicht ist.At the same time, this sniffer valve 21 also serves to vent the pressure chamber 9, ie. H. the degassing of the hydraulic fluid in the pressure chamber 9. For this purpose, the channel 22 in the housing body 2 is designed to rise, in such a way that its geodetically lower end (left channel end in FIG. 1) with the geodetically highest point of the pressure chamber 9 and its geodetically higher end (right channel end in Fig. 1) is connected to the blind bore 20, so that a reliable degassing of the hydraulic fluid or venting of the pressure chamber 9 is always automatically achieved.

Wie aus Fig. 1 und besonders deutlich aus Fig. 2 ersichtlich, ist die Membran 10 mit einer durch ihren Umfangsrand gebildeten Einspannfläche 26 fest zwischen denjenigen Teilen der einander zugekehrten Stirnflächen von Gehäusekörper 2 und Pumpendeckel 1 eingespannt, die an den Förderraum 8 und den Druckraum 9 angrenzen, wobei diese Membraneinspannfläche 26 in eine in der Stirnfläche des Gehäusekörpers 2 gebildete ringförmige Ausnehmung 27 eingelegt ist. Radial außerhalb dieser Membraneinspannfläche 26 ist in der Stirnfläche des Gehäusekörpers 2 ein umlaufender Druckausgleichsraum 28 vorgesehen, der die Form einer Ringnut aufweist und beim dargestellten Ausführungsbeispiel über einen einzigen, im Gehäusekörper 2 gebildeten Verbindungskanal 29 mit der das Schnüffelventil 21 aufnehmenden Sackbohrung 20 - und damit über den Kanal 22 mit dem Druckraum 9 - in Verbindung steht. Damit ist gewährleistet, daß sowohl radial außerhalb als auch radial innerhalb der Membraneinspannfläche 26, d. h. also sowohl im Druckraum 9 als auch im Druckausgleichsraum 28, stets der gleiche Druck herrscht und somit die Membraneinspannfläche 26 druckentlastet ist.As can be seen from FIG. 1 and particularly clearly from FIG. 2, the membrane 10 with a clamping surface 26 formed by its peripheral edge is firmly clamped between those parts of the mutually facing end faces of the housing body 2 and pump cover 1 which are connected to the delivery chamber 8 and the pressure chamber 9 adjoin, this membrane clamping surface 26 being inserted into an annular recess 27 formed in the end face of the housing body 2. Radially outside of this membrane clamping surface 26, a circumferential pressure compensation chamber 28 is provided in the end face of the housing body 2, which has the shape of an annular groove and in the illustrated Embodiment via a single connection channel 29 formed in the housing body 2 is connected to the blind bore 20 receiving the snifting valve 21 - and thus via the channel 22 to the pressure chamber 9. This ensures that the same pressure always prevails both radially outside and radially inside the membrane clamping surface 26, that is to say both in the pressure chamber 9 and in the pressure compensation chamber 28, and the membrane clamping surface 26 is thus relieved of pressure.

Wie aus der Zeichnung ersichtlich, ist der Verbindungskanal 29 - genau wie der Kanal 22 - ebenfalls ansteigend verlaufend im Gehäusekörper 2 ausgebildet und derart angelegt, daß er von der geodätisch höchsten Stelle des Druckausgleichsraumes 28 zur geodätisch höchsten Stelle des Druckraumes 9 - nämlich über die Sackbohrung 20 und den Kanal 22 - führt, so daß auch dadurch für eine sichere Entgasung des Druckausgleichsraumes 28 ge sorgt ist.As can be seen from the drawing, the connecting channel 29 - like the channel 22 - is also designed to rise in the housing body 2 and is designed such that it extends from the geodetically highest point of the pressure compensation chamber 28 to the geodetically highest point of the pressure chamber 9 - namely via the blind bore 20 and the channel 22 - leads, so that this also ensures a safe degassing of the pressure compensation chamber 28 ge.

Die nach außen erfolgende Abdichtung des Druckraums 9 bzw. des Druckausgleichsraums 28 erfolgt über eine gesonderte Ringdichtung 30, die radial außerhalb des Druckausgleichsraums 28 in eine Ringnut 31 in der Stirnfläche des Gehäusekörpers 2 eingelegt ist.The outward sealing of the pressure chamber 9 or the pressure compensation chamber 28 takes place via a separate ring seal 30, which is inserted radially outside the pressure compensation chamber 28 into an annular groove 31 in the end face of the housing body 2.

Bei der abgewandelten Ausführungsform der Membraneinspannung gemäß Fig. 3 ist die Membran 10 mit ihrer Einspannfläche 26 durch einen gesonderten Spannring 32 mittels Schrauben 33 an der Stirnfläche des Pumpendeckels 1 festgelegt, wobei dieser Spannring 32 als eine Vielzahl achsparalleler Durchgangsbohrungen 34 aufweisende Lochplatte ausgebildet ist, die beim Membransaughub eine einwandfreie rückseitige Membranabstützung gewährleistet und im Druckraum 9' aufgenommen ist. Beim dargestellten Ausführungsbeispiel ist der Druckraum 9' in seinem Durchmesser größer als der Förderraum 8 ausgebildet und demgemäß derart ausgestaltet, daß er sich in radialer Richtung bis über die Membraneinspannfläche 26 hinaus erstreckt. Dadurch ist radial außerhalb der Membraneinspannfläche 26. im Druckraum 9' ein Ringraum 28' gebildet, der den - einstückig mit dem Druckraum 9' - verbundenen Druckausgleichsraum darstellt und gewährleistet, daß sowohl radial außerhalb als auch radial innerhalb der Membraneinspannfläche 26 stets der gleiche Druck vorherrscht. Aufgrund dieser speziellen - vergrößerten - Ausbildung des Druckraumes 9' ist es nicht erforderlich, daß der den Druckausgleichsraum darstellende Ringraum 28' noch über einen gesonderten Verbindungskanal (ähnlich dem Verbindungskanal 29 gemäß Fig. 1 und 2) mit dem Druckraum 9' verbunden ist; in anderen Worten ausgedrückt, bedeutet dies, daß der gesonderte Verbindungskanal einschließlich des Druckausgleichsraumes 28' einen Teil des Druckraumes 9' selbst bildet.3, the diaphragm 10 is fixed with its clamping surface 26 by a separate clamping ring 32 by means of screws 33 on the end face of the pump cover 1, this clamping ring 32 being designed as a perforated plate having a plurality of axially parallel through bores 34 which a perfect membrane support is guaranteed at the membrane suction stroke and is accommodated in the pressure chamber 9 '. In the illustrated embodiment, the pressure chamber 9 'is larger in diameter than the delivery chamber 8 and is accordingly designed such that it is in extends radially beyond the membrane clamping surface 26. As a result, an annular space 28 'is formed radially outside of the diaphragm clamping surface 26' in the pressure chamber 9 ', which represents the pressure compensation chamber connected in one piece to the pressure chamber 9' and ensures that the same pressure always prevails both radially outside and radially inside the diaphragm clamping surface 26 . Due to this special - enlarged - design of the pressure chamber 9 ', it is not necessary that the annular space 28' representing the pressure compensation chamber is still connected to the pressure chamber 9 'via a separate connecting channel (similar to the connecting channel 29 according to FIGS. 1 and 2); In other words, this means that the separate connecting duct including the pressure compensation space 28 'forms part of the pressure space 9' itself.

Wie Fig. 3 zu entnehmen, ist auch bei der Ausführungsform gemäß Fig. 3 radial außerhalb des Druckausgleichsraums 28 zwischen den einander anliegenden Stirnflächen des Gehäusekörpers 2 und des Pumpendeckels 1 die Ringdichtung 30 vorgesehen, welche die im Druckraum 9' bzw. im Druckausgleichsraum 28' befindliche Hydraulikflüssigkeit nach außen abdichtet.As can be seen in FIG. 3, in the embodiment according to FIG. 3, the ring seal 30 is also provided radially outside the pressure equalization chamber 28 between the abutting end faces of the housing body 2 and the pump cover 1, which seal seals in the pressure chamber 9 'or in the pressure equalization chamber 28'. hydraulic fluid located outside seals.

Die weiterhin abgewandelte Ausführungsform gemäß Fig. 4 unterscheidet sich von derjenigen gemäß Fig. 1 und 2 lediglich dadurch, daß die Membran 10 an ihrer Einspannfläche 26 zusätzlich einen äußeren Rand 26' aufweist, der eine beträchtlich geringere Dicke als der Membranhauptkörper besitzt, wobei die Dicke dieses äußeren Einspannrandes 26' bevorzugt etwa 5 - 20 % der Dicke des Membranhauptkörpers beträgt. Außerdem soll die Breite des äußeren Einspannrandes 26' wenigstens dem 10-fachen seiner Dicke entsprechen.The further modified embodiment according to FIG. 4 differs from that according to FIGS. 1 and 2 only in that the membrane 10 additionally has an outer edge 26 ′ on its clamping surface 26, which has a considerably smaller thickness than the membrane main body, the thickness this outer clamping edge 26 'is preferably about 5-20% of the thickness of the membrane main body. In addition, the width of the outer clamping edge 26 'should be at least 10 times its thickness.

Mit einer derartigen Ausgestaltung der Membraneinspannfläche 26 einschließlich verdünntem äußerem Einspannrand 26' wird der Vorteil einer noch größeren Abdicht- und auch Einspannsicherheit erreicht. Es kann nämlich, speziell auch im Betriebsstillstand der Membranpumpe, der Störfall eintreten, daß der Druck im Förderraum 8 größer wird als im Druckraum 9, beispielsweise wenn das Auslaßventil 12 klemmt oder wenn dessen Feder bricht usw. In solch einem Störfall wird dann die Membran 10 - ähnlich ihrer Bewegung beim Saughub - ausgelenkt und an die konkave Abstützfläche des Druckraums 9 gedrückt, wobei der durch die übliche Einspannfläche 26 gebildete Einspannrand der Membran 10 über Gebühr beansprucht wird. Dies ergibt sich deswegen, weil der in diesem Augenblick im Förderraum 8 herrschende Druck die förderseitige Membranfläche beaufschlagt, gleichzeitig jedoch nicht durch einen entsprechenden Druck im Druckraum 9 kompensiert ist. Das hat zur Folge, daß die derart beaufschlagte Membran 10 an ihrer üblichen Einspannfläche 26 förderseitig geringfügig verformt wird, so daß durch, den somit entstehenden Spalt Fördermedium vom Förderraum 8 in den Druckraum 9 kriechen könnte.With such a configuration of the membrane clamping surface 26 Finally, the thinned outer clamping edge 26 'has the advantage of an even greater sealing and clamping security. It can namely, especially when the diaphragm pump is at a standstill, that the pressure in the delivery chamber 8 becomes greater than in the pressure chamber 9, for example if the outlet valve 12 is stuck or if its spring breaks, etc. In such a malfunction the diaphragm 10 - Similar to their movement during the suction stroke - deflected and pressed against the concave support surface of the pressure chamber 9, the clamping edge of the membrane 10 formed by the usual clamping surface 26 being excessively stressed. This is because the pressure prevailing at the moment in the delivery chamber 8 acts on the delivery-side membrane surface, but at the same time is not compensated for by a corresponding pressure in the pressure chamber 9. The result of this is that the membrane 10 acted upon in this way is slightly deformed on its usual clamping surface 26 on the conveying side, so that the resulting conveying medium could creep from the conveying chamber 8 into the pressure chamber 9.

Derartiges wird jedoch wirksam durch den zusätzlich zur üblichen Einspannfläche 26 vorgesehenen, verdünnt ausgebildeten äußeren Membraneinspannrand 26' verhindert, da dieser aufgrund seiner geringen Dicke - in Verbindung mit einer bestimmten Mindestbreite - gleichsam einen Klebeffekt ausübt, weil das dünne Membranmaterial an den durch die übliche Oberflächenrauhigkeit bedingten kleinen Vorsprüngen bzw. Erhebungen der metallischen Dichtflächen von Pumpendeckel 1 und Gehäusekörper 2 anhaftet und somit an einer unerwünschten Wander- bzw. Fließbewegung gehindert wird. Somit kann auch im genannten Störfall am äußeren Membraneinspannrand 26' vorbei keinerlei Fördermedium vom Förderraum 8 in den Druckraum 9 eindringen.However, this is effectively prevented by the thinned outer membrane clamping edge 26 'provided in addition to the customary clamping surface 26, since due to its small thickness - in conjunction with a certain minimum width - it practically exerts an adhesive effect because the thin membrane material adheres to the usual surface roughness conditional small projections or elevations of the metallic sealing surfaces of the pump cover 1 and housing body 2 adheres and is thus prevented from an undesirable migration or flow movement. Thus, even in the above-mentioned malfunction, no conveyed medium can penetrate from the delivery chamber 8 into the pressure chamber 9 past the outer membrane clamping edge 26 '.

Claims (8)

1. Membranpumpe mit wenigstens einer Membran, die einen Förderraum von einem mit Hydraulikflüssigkeit gefüllten Druckraum trennt und mit einer durch ihren Umfangsrand gebildeten Einspannfläche fest zwischen einem Gehäusekörper sowie einem Pumpendeckel eingespannt ist, und mit einem hydraulischen Membranantrieb in Form eines oszillierenden Verdrängerkolbens, der im Gehäusekörper zwischen dem Druckraum und einem Hydraulikvorrat verschieblich ist, dadurch gekennzeichnet,
daß radial außerhalb der Membraneinspannfläche (26, 26') ein umlaufender Druckausgleichsraum (28 bzw. 28') vorgesehen ist, der über wenigstens einen Verbindungskanal (29) mit dem Druckraum (9 bzw. 9' ) bzw. mit dem Hydraulikvorrat (6) in Verbindung steht, und daß radial außerhalb des Druckausgleichsraums (28 bzw. 28' ) zwischen Pumpendeckel (1) und Gehäusekörper (2) eine gesonderte Ringdichtung (30) angeordnet ist, die den Druckausgleichsraum (28 bzw. 28') bzw. den Druckraum (9 bzw. 9') nach außen abdichtet.1.Diaphragm pump with at least one diaphragm, which separates a delivery chamber from a pressure chamber filled with hydraulic fluid and is firmly clamped between a housing body and a pump cover with a clamping surface formed by its peripheral edge, and with a hydraulic diaphragm drive in the form of an oscillating displacement piston, which is in the housing body is displaceable between the pressure chamber and a hydraulic supply, characterized in that
that a circumferential pressure compensation chamber (28 or 28 ') is provided radially outside the membrane clamping surface (26, 26'), which is connected to the pressure chamber (9 or 9 ' ) or the hydraulic supply (6) via at least one connecting channel (29) is connected, and that radially outside of the pressure compensation chamber (28 or 28 ') between the pump cover (1) and housing body (2) a separate ring seal (30) is arranged, which the pressure compensation chamber (28 or 28') or the pressure chamber (9 or 9 ') seals to the outside. 2. Membranpumpe nach Anspruch l, dadurch gekennzeichnet, daß die gesonderte Ringdichtung (30) in eine Ringnut (31) in der Stirnfläche des Gehäusekörpers (2) eingelegt ist.2. Diaphragm pump according to claim l, characterized in that the separate ring seal (30) is inserted into an annular groove (31) in the end face of the housing body (2). 3. Membranpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Druckausgleichsraum (28) als in der Stirnfläche des Gehäusekörpers (2) vorgesehene Ringnut ausgebildet ist, die wenigstens an einer Stelle über den im Gehäusekörper (2) verlaufenden Verbindungskanal (29) mit dem Druckraum (9) verbunden ist.3. Diaphragm pump according to claim 1 or 2, characterized in that the pressure compensation chamber (28) is designed as an annular groove provided in the end face of the housing body (2), which at least at one point via the connecting channel (29) extending in the housing body (2) the pressure chamber (9) is connected. 4. Membranpumpe nach Anspruch 1 oder 3, dadurch gekennzeichnet,
daß der Verbindungskanal (29, 20, 22) von der geodätisch höchsten Stelle des Druckausgleichsraums (28) zu der geodätisch höchsten Stelle des Druckraums (9) geführt ist.4. Diaphragm pump according to claim 1 or 3, characterized in
that the connecting channel (29, 20, 22) is guided from the geodetically highest point of the pressure compensation chamber (28) to the geodetically highest point of the pressure chamber (9). 5. Membranpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Einspannfläche (26) der Membran (10) mit einem gesonderten, im Druckraum (9' ) angeordneten Spannring (32) an der Stirnfläche des Pumpendeckels (1) befestigt und der den Spannring (32) aufnehmende Druckraum (9' ) in radialer Richtung derart bis über die Membraneinspannfläche (26) vergrößert ist, daß der Druckausgleichsraum (28' ) einstückig mit dem Druckraum (9' ) ausgebildet ist.5. Diaphragm pump according to claim 1 or 2, characterized in that the clamping surface (26) of the membrane (10) with a separate, arranged in the pressure chamber (9 ') clamping ring (32) on the end face of the pump cover (1) and the Clamping ring (32) receiving pressure chamber (9 ') is enlarged in the radial direction until the membrane clamping surface (26) is such that the pressure compensation chamber (28') is integrally formed with the pressure chamber (9 '). 6. Membranpumpe nach einem der Ansprüche 1 bis 5, dadurch.gekennzeichnet,
daß die Membran (10) am äußeren Rand (26') ihrer Einspannfläche (26) eine beträchtlich geringere Dicke als im Bereich ihres Hauptkörpers aufweist.6. diaphragm pump according to any one of claims 1 to 5, characterized.
that the membrane (10) on the outer edge (26 ') of its clamping surface (26) has a considerably smaller thickness than in the region of its main body. 7. Membranpumpe nach Anspruch 6, dadurch gekennzeichnet, daß die Dicke des verdünnt ausgebildeten Membraneinspannrandes (26') etwa 5 - 20 % der Dicke des Hauptkörpers der Membran (10) beträgt.7. Diaphragm pump according to claim 6, characterized in that the thickness of the thinned membrane clamping edge (26 ') is about 5 - 20% of the thickness of the main body of the membrane (10). 8. Membranpumpe nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß die Breite des äußeren Einspannrandes (26') der Membran (10) wenigstens dem 10fachen seiner Dicke entspricht.8. Diaphragm pump according to claim 6 or 7, characterized in that the width of the outer clamping edge (26 ') of the membrane (10) corresponds to at least 10 times its thickness.
EP81110720A 1980-12-29 1981-12-23 Diaphragm pump with a pressure relieved diaphragm Expired EP0055467B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81110720T ATE10670T1 (en) 1980-12-29 1981-12-23 DIAPHRAGM PUMP WITH RELIEVED CLAMPED DIAPHRAGM.

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Application Number Priority Date Filing Date Title
DE3049341 1980-12-29
DE3049341 1980-12-29

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EP0055467A1 true EP0055467A1 (en) 1982-07-07
EP0055467B1 EP0055467B1 (en) 1984-12-05

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Also Published As

Publication number Publication date
US4430048A (en) 1984-02-07
JPS57146078A (en) 1982-09-09
JPS6331673B2 (en) 1988-06-24
EP0055467B1 (en) 1984-12-05
ATE10670T1 (en) 1984-12-15

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