EP0085945A1 - Membrane module for a pneumatic control system - Google Patents

Membrane module for a pneumatic control system Download PDF

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Publication number
EP0085945A1
EP0085945A1 EP83100988A EP83100988A EP0085945A1 EP 0085945 A1 EP0085945 A1 EP 0085945A1 EP 83100988 A EP83100988 A EP 83100988A EP 83100988 A EP83100988 A EP 83100988A EP 0085945 A1 EP0085945 A1 EP 0085945A1
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Prior art keywords
membrane
comparison
pressure
plates
membranes
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Granted
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EP83100988A
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German (de)
French (fr)
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EP0085945B1 (en
Inventor
Vladimir Dr. Multrus
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Honeywell GmbH
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Honeywell GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15C—FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES
    • F15C5/00—Manufacture of fluid circuit elements; Manufacture of assemblages of such elements integrated circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B5/00—Transducers converting variations of physical quantities, e.g. expressed by variations in positions of members, into fluid-pressure variations or vice versa; Varying fluid pressure as a function of variations of a plurality of fluid pressures or variations of other quantities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15C—FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES
    • F15C3/00—Circuit elements having moving parts
    • F15C3/04—Circuit elements having moving parts using diaphragms
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2278—Pressure modulating relays or followers
    • Y10T137/2409—With counter-balancing pressure feedback to the modulating device

Definitions

  • the present invention relates to a membrane module for pneumatic control systems according to the preamble of claim 1.
  • Such membrane modules can be used in devices for regulating or controlling controlled variables, in particular in the case of pressure medium-operated controllers, ratio relays, addition relays or the like.
  • the entire membrane package is by means of a Bridge firmly connected. The firm clamping of the diaphragm plate in the diaphragms, as well as the implementation and fixation of this web, makes it difficult with these known so-called bushing regulators to center the entire diaphragm package and its parallel alignment with respect to the nozzle of the force / pressure converter.
  • a pneumatic membrane module known from DE-PS 25 29 457.
  • the membrane plates are loosely stacked in the housing, with flat, thin, comparison membranes arranged in between acting on the membrane plates. Sealing membranes with a negligible effective area demarcate the individual stages.
  • the entire diaphragm plate package is centered by adapting the diaphragm plate diameter to the recess in the housing.
  • the membrane plates In order to be able to specify an effective membrane area, the membrane plates must have a stepped diameter. While this known membrane module has proven itself overall, there are tolerance and friction problems due to the adjustment of the membrane plate diameter to the housing recess, especially when plastic injection molded parts are used.
  • the pneumatic membrane module consists of several stacked disc-shaped housing parts 11-16, in which air channels and chambers are incorporated in a known manner, which need not be explained in more detail in the present case.
  • the upper housing part 16 also forms the lower part of a pressure divider 17, the upper part of which consists of an adjusting button 18 which is pressed against the lower part 16 by means of a screw 19 with the interposition of an elastic sealing ring 20.
  • the screw 19 cooperates with a lock nut 21, and an interposed disc spring 22 specifies a defined contact pressure.
  • An additional seal is specified via an O-ring 23.
  • the pressure divider 17 is in principle a known pressure divider of the type described in DE-OS 25 09 963. A more detailed explanation of the structure and mode of operation of the pressure divider is therefore not necessary.
  • Each housing part 11 to 16 is provided with a central recess or chamber 24 to 29, the chambers 24, 25; 26, 27 and 28, 29 face each other in pairs and are separated by comparison membranes 30, 31 and 32. Sealing membranes 33 and 34 seal the individual systems against one another.
  • the comparison and sealing membranes located inside the entire package each have a central hole 35. Through this hole, membrane plates 36 to 39 arranged in the recesses 25 to 28 extend with pin extensions 40, the pin extensions 40 in corresponding recesses 41 in the respectively opposite membrane plate intervention.
  • the depth of the recesses 41 is so matched to the length of the pin lugs 40 that ring webs 42 on the membrane plates press into the comparison and sealing membranes lying between the membrane plates by a defined amount and achieve a corresponding sealing effect.
  • the membrane plates 36, 29 and comparative membranes 30, 32 each closing the package; insofar as it has a special configuration in that the outwardly facing plane surfaces of the membrane plates are provided with an annular groove 43, in each of which an annular collar 44 arranged on the membrane engages. As a result, the entire package is guided in its axial movement and secured against lateral displacement and asymmetry.
  • FIG 1a shows again schematically the pneumatic membrane module according to Figure 1 and its signal application.
  • the module has the function of a pneumatic proportional controller, wherein on the middle comparison membrane, a target / actual value comparison of the pressures p egenventlickcroft G W and p X is carried out.
  • the lower chamber is fed by the supply air pressure p z and partially vented to the atmosphere via a nozzle / baffle plate system, which results in a variable outlet pressure p a depending on the setpoint / actual value comparison.
  • This starting Pressure p acts on the membrane / plate pack in the sense of a negative return from below and in the sense of a positive return from above.
  • the size of the positive feedback can be variably specified via the pressure divider.
  • FIGS. 2 and 2a The exemplary embodiment shown in FIGS. 2 and 2a is essentially a ratio module, the structure and function of which has been described in principle in DE-PS 25 29 457 with reference to FIGS. 2a to 2c.
  • the new construction principles already described with reference to FIG. 1 were also used in this module, which is expressed by the use of the same reference numbers.
  • the module therefore does not need to be described again in this regard.
  • a diaphragm 45 and a cover plate 46 are arranged under the pressure divider 17, the cover plate 46 serving to accommodate compressed air channels in a manner not shown in any detail.
  • the loose stacking of the diaphragm plates 36, 39 advantageously allows them to be lifted apart, which enables the starting point to be set independently of the ratio coefficient.
  • the ratio coefficient is predetermined by the quotient from the effective area of the membrane 32 to the effective area of the membrane 30 and can be changed by adjusting the pressure divider.
  • the starting point is predetermined by the point at which the divided inlet pressure Px exceeds the starting point pressure p w .
  • the introduction of the pressure p m, the output pressure can move a total of p ordinate. This fact can be found in more detail from the aforementioned DE-PS 25 29 457.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Reciprocating Pumps (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

Abstract

Ein Membranmodul für pneumatische Regelungssysteme umfaßt wenigstens eine Druckvergleichsstufe und einen von dieser gesteuerten Kraft/Druck-Umformer. Zum Aufbau des Moduls werden durch Membranen abgeteilte Kammern in einem Gehäuse verwendet, wobei die kraftübertragung zwischen den Membranen über dazwischen angeordnete Membranteller erfolgt. Zur reibungsfreien Lagerung der Membranteller in dem Gehäuse ohne daß es hierbei einer Befestigung mit den dazwischen angeordneten Membranen bedarf, weist der Membranmodul folgenden Aufbau auf: die Membranteller (36-39) weisen zentrale Stiftansätze (40) und Ausnehmungen (44) auf, wobei der Stiftansatz eines Membrantellers jeweils in eine Ausnehmung des berachbarten Membrantellers über ein in der Vergleichs- bzw. Dichtmembran (30-32 bzw. 33,34) angeordnetes zentrales Loch (35) eingreift; das Gehause (11-16) und die Membranteller (36-39) weisen an sich gegenüberliegende Flächen Ringstege (42) auf, die bei anliegendem Druck zur Abdichtung in die Membranen (30-34) eingepreßt werden; und wengistens zwei Membranteller (36-39) weisen in ihren Planflächen konzentrische Ringnuten (43) auf, in die die zugeordneten Membranen (30,32) mit konzentrischen Ringkragen, (41) eingreifen.A membrane module for pneumatic control systems comprises at least one pressure comparison stage and a force / pressure transducer controlled by this. To build the module, chambers separated by membranes in a housing are used, the force transmission between the membranes taking place via membrane plates arranged in between. For the friction-free storage of the diaphragm plate in the housing without the need for fastening with the diaphragms arranged between them, the diaphragm module has the following structure: the diaphragm plates (36-39) have central pin bosses (40) and recesses (44), the Pin attachment of a membrane plate engages in a recess in the adjacent membrane plate via a central hole (35) arranged in the comparison or sealing membrane (30-32 or 33, 34); the housing (11-16) and the diaphragm plates (36-39) have ring webs (42) on opposite surfaces, which are pressed into the diaphragms (30-34) for sealing when pressure is applied; and at least two membrane plates (36-39) have concentric annular grooves (43) in their flat surfaces, into which the associated membranes (30, 32) with concentric annular collars (41) engage.

Description

Die vorliegende Erfindung bezieht sich auf einen Membranmodul für pneumatische Regelungssysteme nach dem Gattungsbegriff des Anspruches 1.The present invention relates to a membrane module for pneumatic control systems according to the preamble of claim 1.

Derartige Menbranmodule können in Einrichtungen zum Regeln oder Steuern von Regelgrößen,insbesondere bei druckmittelbetriebenen Reglerr, Verlhältnisrelais, Additionsrelais oder dergleichen Verwendung finden. Bei bekannten Einrichtungen dieser Art, wie sie beispielsweise in dem Buch von Hengstenberg "Meßen und Regeln in der chemischen Technik", Springer Verlag 1964, Seiten 1159 und 1170, insbesondere anhand der Abbildungen 127 und 136, beschrieben sind, ist das gesamte Membranpaket mittels eines Steges fest verbunden. Die feste Einspannung der Membranteller in die Membranen, sowie die Durchführung und Fixierung dieses Steges, erschwert bei diesen bekannten sogenannten Büchsenreglern die Zentrierung des gesamten Membranpaketes und seine paralleleAusrichtung in Bezug auf die Düse des Kraft/Druck-Umformers. Um eine unerwünschte Hysterese, Knicke in der Kennlinie bzw. Änderungen der wirksamen Membranflächen zu vermeiden, werden bei den bekannten Büchsenreglern Doppelmembranen mit Wulst und mit entlüftetem Zwischenraum benutzt. Dadurch verdoppelt sich nicht nur die Anzahl der erforderlichen Membranen, sondern es wird der gesamteAufbau aufwendiger, was einerMiniaturisierung der Einrichtung hinderlich im Wege steht.Such membrane modules can be used in devices for regulating or controlling controlled variables, in particular in the case of pressure medium-operated controllers, ratio relays, addition relays or the like. In known devices of this type, as described, for example, in the book by Hengstenberg "Measuring and Regulating in Chemical Technology", Springer Verlag 1964, pages 1159 and 1170, in particular with reference to Figures 127 and 136, the entire membrane package is by means of a Bridge firmly connected. The firm clamping of the diaphragm plate in the diaphragms, as well as the implementation and fixation of this web, makes it difficult with these known so-called bushing regulators to center the entire diaphragm package and its parallel alignment with respect to the nozzle of the force / pressure converter. In order to avoid an undesired hysteresis, kinks in the characteristic curve or changes in the effective membrane surfaces, double diaphragms with a bead and with a vented space are used in the known rifle regulators. This doubled Not only is the number of membranes required, but the entire structure becomes more complex, which hinders miniaturization of the device.

In dieser Hinsicht wird durch einen aus der DE-PS 25 29 457 bekannten pneumatischen Membranmodul eine Verbesserung erzielt. Bei diesem Modul sind die Membranteller lose in dem Gehäuse gestapelt, wobei flache,dünne, dazwischen angeordnete Vergleichsmembranen verschiebend auf die Membranteller einwirken. Dichtmembranen mit vernachlässigbarer wirksamer Fläche grenzen die einzelnen Stufen gegeneinander ab. Die Zentrierung des gesamten Membrantellerpaketes erfolgt durch eine Anpassung des Membrantellerdurchmessers an die Ausnehmung des Gehäuses. Um eine wirksame Membranfläche vorgeben zu können, müssen die Membranteller einen abgesetzten Durchmesser aufweisen. Während sich dieser bekannte Membranmodul insgesamt bewährt hat, ergeben sich doch Toleranz- und Reibungsprobleme aufgrund der Abstimmung des Membrantellerdurchmessers auf die Gehäuseausnehmung, insbesondere wenn Kunststoffspritzgussteile verwendet werden.In this regard, an improvement is achieved by a pneumatic membrane module known from DE-PS 25 29 457. In this module, the membrane plates are loosely stacked in the housing, with flat, thin, comparison membranes arranged in between acting on the membrane plates. Sealing membranes with a negligible effective area demarcate the individual stages. The entire diaphragm plate package is centered by adapting the diaphragm plate diameter to the recess in the housing. In order to be able to specify an effective membrane area, the membrane plates must have a stepped diameter. While this known membrane module has proven itself overall, there are tolerance and friction problems due to the adjustment of the membrane plate diameter to the housing recess, especially when plastic injection molded parts are used.

Es ist daher die Aufgabe der vorliegenden Erfindung, unter Beibehaltung der sonstigen Vorteile,wie loser Stapelung, billige Herstellung, einfache Montage, mögliche Miniaturisierung usw. die Toleranzprobleme zu beseitigen. Die Lösung dieser Aufgabe gelingt gemäß der im Anspruch 1 gekennzeichneten Erfindung. Weitere vorteilhafte Ausgestaltungen der Erfindung sind den Unteransprüchen entnehmbar.It is therefore the object of the present invention to eliminate the tolerance problems while maintaining the other advantages, such as loose stacking, cheap manufacture, simple assembly, possible miniaturization, etc. This object is achieved in accordance with the invention characterized in claim 1. Further advantageous embodiments of the invention can be found in the subclaims.

Anhand von in den Figuren der beiliegenden Zeichnung dargestellten Ausführungsbeispielen sei im folgenden die Erfindung näher erläutert.The invention is explained in more detail below on the basis of exemplary embodiments illustrated in the figures of the accompanying drawing.

Es zeigen:

  • Fig.1 den konstruktiven Aufbau eines erfindungsgemäßen Membranmoduls erster Ausführung in einem Axialschnitt;
  • Fig.la den schematischen Aufbau des Membranmoduls gemäß Figur 1 zusammen mit seiner Beschaltung zur Erläuterung von dessen Funktion;
  • Fig.2 den konstruktiven Aufbau eines erfindungsgemäßen Membranmoduls zweiter Ausführungsform in einem Axialschnitt; und
  • Fig.2a den schematischen Aufbau des Membranmoduls gemäß Fig.2 zusammen mit seiner Beschaltung zur Erläuterung von dessen Funktion als Verhältnismodul mit einstellbarem Verhältniskoeffizienten.
Show it:
  • F ig.1 the structural design of a membrane module of the first embodiment according to the invention in an axial section;
  • Fig.la the schematic structure of the membrane module according to Figure 1 together with its circuitry to explain its function;
  • F ig.2 the structural design of a membrane module of the second embodiment according to the invention in an axial section; and
  • F ig.2a the schematic structure of the membrane module according to Figure 2 along with its circuitry for explaining the function of the ratio module with adjustable ratio coefficient.

Gemäß Figur. 1 besteht der pneumatische Membranmodul aus mehreren aufeinandergestapelten scheibenförmigen Gehäuseteilen 11-16,in die in bekannter Weise Luftkanäle und Kammern eingearbeitet sind, was im vorliegenden Fall nicht näher erläutert werden muß. Das obere Gehäuseteil 16 bildet zugleich das Unterteil eines Druckteilers 17,dessen Oberteil aus einem Einstellknopf 18 besteht, welcher mittels einer Schraube 19 unter Zwischenlage eines elastischen Dichtungsringes 20 gegen das. Unterteil 16 gepreßt wird. Die Schraube 19 wirkt mit einer Gegenmutter 21 zusammen,und eine dazwischengefügte Tellerfeder 22 gibt eine definierte Anpreßkraft vor. über einen O-Ring 23 wird eine zusätzliche Abdichtung vorgegeben. Bei dem Druckteiler 17 handelt es sich im Prinzip um einen bekannten Druckteiler der in der DE-OS 25 09 963 beschriebenen Bauart. Eine nähere Erläuterung von Aufbau und Wirkungsweise des Druckteilers ist daher nicht erforderlich.According to figure. 1, the pneumatic membrane module consists of several stacked disc-shaped housing parts 11-16, in which air channels and chambers are incorporated in a known manner, which need not be explained in more detail in the present case. The upper housing part 16 also forms the lower part of a pressure divider 17, the upper part of which consists of an adjusting button 18 which is pressed against the lower part 16 by means of a screw 19 with the interposition of an elastic sealing ring 20. The screw 19 cooperates with a lock nut 21, and an interposed disc spring 22 specifies a defined contact pressure. An additional seal is specified via an O-ring 23. The pressure divider 17 is in principle a known pressure divider of the type described in DE-OS 25 09 963. A more detailed explanation of the structure and mode of operation of the pressure divider is therefore not necessary.

Jedes.Gehäuseteil 11 bis 16 ist mit einer zentralen Ausnehmung bzw. Kammer 24 bis 29 versehen, wobei die Kammern 24,25; 26,27 und 28,29 paarweise einander zugekehrt und durch Vergleichsmembranen30,31 und 32 voneinander abgetrennt sind. Dichtmembranen 33 und 34 dichten die einzelnen Systeme gegeneinander ab.Each housing part 11 to 16 is provided with a central recess or chamber 24 to 29, the chambers 24, 25; 26, 27 and 28, 29 face each other in pairs and are separated by comparison membranes 30, 31 and 32. Sealing membranes 33 and 34 seal the individual systems against one another.

Die in dem gesamten Paket innenliegenden Vergleichs-und Dichtmembranen besitzen jeweils ein zentrales Loch 35. Durch dieses Loch greifen in den Ausnehmungen 25 bis 28 angeordnete Membranteller 36 bis 39 mit Stiftansätzen 40 hindurch,wobei die Stiftansätze 40 in entsprechende Ausnehmungen 41 in dem jeweils gegenüberliegenden Membranteller eingreifen. Die Tiefe der Ausnehmungen 41 ist so auf die Länge der Stiftansätze 40 abgestimmt, daß sich Ringstege 42 an den Membrantellern in die zwischen den Membrantellem liegenden Vergleichs- und Dichtmembranen um ein definiertes Maß einpressen und eine entsprechende Dichtwirkung erzielen.The comparison and sealing membranes located inside the entire package each have a central hole 35. Through this hole, membrane plates 36 to 39 arranged in the recesses 25 to 28 extend with pin extensions 40, the pin extensions 40 in corresponding recesses 41 in the respectively opposite membrane plate intervention. The depth of the recesses 41 is so matched to the length of the pin lugs 40 that ring webs 42 on the membrane plates press into the comparison and sealing membranes lying between the membrane plates by a defined amount and achieve a corresponding sealing effect.

Die das Paket jeweils abschließenden Membranteller 36, 29 und Vergleichsmembranen 30, 32 weise; insofern eine spezielle Ausgestaltung auf, als die nach außen weisenden Planflächen der Membranteller mit einer Ringnut 43 versehen sind, in die jeweils ein an der Membran angeordneter Ringkragen 44 eingreift. Hierdurch ist das gesamte Paket bei seiner Axialbewegung geführt und gegen seitliche Verschiebung und Unsymmetrie gesichert.The membrane plates 36, 29 and comparative membranes 30, 32 each closing the package; insofar as it has a special configuration in that the outwardly facing plane surfaces of the membrane plates are provided with an annular groove 43, in each of which an annular collar 44 arranged on the membrane engages. As a result, the entire package is guided in its axial movement and secured against lateral displacement and asymmetry.

Figurla zeigt nochmals schematisch den pneumatischen Membranmodul gemäß Figur 1 und seine Signalbeaufschlagung. Wie der Fachmann leicht erkennt, hat der Modul die Funktion eines pneumatischen P-Reglers, wobei an der mittleren Vergleichmembran ein Soll/Istwertvergleich durch Gegeneinanderschalten der Drücke pw und pX erfolgt. Die untere Kammer wird vom Zuluftdruck pz gespeist und über ein Düse/Prallplattesystem in die Atmosphäre teilweise entlüftet, wodurch sich in Abhängigkeit vom Soll/Istwertvergleich ein veränderlicher Ausgangsdruck pa einstellt. Dieser Ausgangsdruck p beaufschlagt im Sinne einer negativen Rückführung von unten und im Sinne einer positiven Rückführung von oben das Membran/Tellerpaket. Die Größe der positiven Rückführung kann hierbei über den Druckteiler veränderlich vorgegeben werden.Figure 1a shows again schematically the pneumatic membrane module according to Figure 1 and its signal application. As the skilled artisan will readily appreciate, the module has the function of a pneumatic proportional controller, wherein on the middle comparison membrane, a target / actual value comparison of the pressures p egeneinanderschalten G W and p X is carried out. The lower chamber is fed by the supply air pressure p z and partially vented to the atmosphere via a nozzle / baffle plate system, which results in a variable outlet pressure p a depending on the setpoint / actual value comparison. This starting Pressure p acts on the membrane / plate pack in the sense of a negative return from below and in the sense of a positive return from above. The size of the positive feedback can be variably specified via the pressure divider.

Bei dem in den Figuren 2 und 2a dargestellten Ausführungsbeispieles handelt es sich im wesentlichen um einen Verhältnismodul, dessen Aufbau und Funktion vom Prinzip her in der DE-PS 25 29 457 anhand der Figuren 2a bis 2c bereits beschrieben wurde. Die anhand der Fig.1 bereits beschriebenen neuen Konstruktionsprinzipien wurden auch bei diesem Modul verwendet, was durch die Verwendung gleicher Bezugsziffern zum Ausdruck kommt. Der Modul braucht daher diesbezüglich nicht noch einmal beschrieben zu werden. Als zusätzliche Elemente sind lediglich unter dem Druckteiler 17 eine Membran 45 und eine Deckelplatte 46 angeordnet, wobei die Deckelplatte 46 in zum Teil nicht räher dargestellter Weise der Aufnahme von Druckluftkanälen dient.The exemplary embodiment shown in FIGS. 2 and 2a is essentially a ratio module, the structure and function of which has been described in principle in DE-PS 25 29 457 with reference to FIGS. 2a to 2c. The new construction principles already described with reference to FIG. 1 were also used in this module, which is expressed by the use of the same reference numbers. The module therefore does not need to be described again in this regard. As additional elements, only a diaphragm 45 and a cover plate 46 are arranged under the pressure divider 17, the cover plate 46 serving to accommodate compressed air channels in a manner not shown in any detail.

Die lose Stapelung der Membranteller 36, 39 gestattet mit Vorteil, daß diese voneinander abheben können, wodurch eine vom Verhältniskoeffizienten unabhängige Einstellung des Startpunktes ermöglicht wird. Der Verhältniskoeffizient ist durch den Quotienten aus wirksamer Fläche der Membran 32 zu wirksamer Fläche der Membran 30 vorgegeben und kann durch Verstellung des Druckteilers verändert werden. Der Startpunkt ist durch den Punkt vorgegeben, in dem der geteilte Eingangsdruck Px den Startpunktdruck pw überschreitet. Durch die Einleitung des Druckes pm läßt sich der Ausgangsdruck pa insgesamt in Ordinatenrichtung verschieben. Dieser Sachverhalt läßt sich aus der zuvor erwähnten DE-PS 25 29 457 in näheren Einzelheiten entnehmen.The loose stacking of the diaphragm plates 36, 39 advantageously allows them to be lifted apart, which enables the starting point to be set independently of the ratio coefficient. The ratio coefficient is predetermined by the quotient from the effective area of the membrane 32 to the effective area of the membrane 30 and can be changed by adjusting the pressure divider. The starting point is predetermined by the point at which the divided inlet pressure Px exceeds the starting point pressure p w . The introduction of the pressure p m, the output pressure can move a total of p ordinate. This fact can be found in more detail from the aforementioned DE-PS 25 29 457.

Das Proportionalverhalten und die Empfindlichkeit der vorstehend beschriebenen pneumatischen Module ist ausgezeichnet, da in dem gesamten Membransystem kaum eine Reibung auftritt. Zudem kann so ein Modul weiterhin einfach und billig montiert werden, indem dieser Stufe für Stufe unter Zwischenlage der Membranen und Einstecken der Membranteller ineinander aufgebaut und anschließend beispielsweise durch Schrauben und Muttern verspannt wird. Das Membran/Tellerpaket bedarf keiner Verspannung; vielmehr dichtet dieses selbsttätig bei angelegten Drücken ab.The proportional behavior and the sensitivity of the pneumatic modules described above is excellent since there is hardly any friction in the entire membrane system. In addition, such a module can still be assembled simply and inexpensively by assembling this step by step with the membranes being inserted and the membrane plates being inserted into one another and then being clamped, for example, using screws and nuts. The membrane / plate pack does not require any tension; rather, this seals automatically when the pressures are applied.

Claims (3)

1. Membranmodul für pneumatische Regelungssysteme, mit mindestens einer Druckvergleichsstufe (31,37,38), die eine anstehende Druckdifferenz in eine Kraft umformt, und mit einem von der Druckvergleichsstufe gesteuerten Kraft/Druck-Umformer (11,30,36), wobei in einem mehrteiligen Gehäuse (11-16) durch Vergleichs- und Dichtmembranen (30-34) unterteilte Kammern (24-29) gebildet sind, in die die miteinander zu vergleichenden Drücke eingeleitet werden, und wobei über von den Vergleichsmembranen beaufschlagte, lose in dem Gehäuse gestapelte Membranteller (36-39) die resultierende Kraft in eine entsprechende Bewegung der Membranteller umgesetzt wird, gekennzeichnet durch folgende Merkmale: a) die Membranteller (36-39) weisen zentrale Stiftansätze (40) und Ausnehmungen (41) auf, wobei der Stiftansatz eines Membrantellers jeweils in eine Ausnehmung des benachbarten Membrantellersüber ein in der Vergleichs- bzw.Dichtmembran (31 bzw.33,34) angeordnetes zentrales Loch (35) eingreift; b) das Gehäuse (11-16) und die Membranteller (36-39) weisen an sich gegenüberliegenden Flächen Ringstege (42) auf, die bei anliegendem Druck zur Abdichtung in die Membranen (30-34) eingepreßt werden; und c) wenigstens 2 Membranteller (36,39) weisen in ihren Planflächen konzentrische Ringnuten (43) auf, in die die zugeordneten Membranen (30,32) mit konzentrischen Ringkragen (44) eingreifen. 1. membrane module for pneumatic control systems, with at least one pressure comparison stage (31,37,38), which converts an existing pressure difference into a force, and with a force / pressure transducer (11,30,36) controlled by the pressure comparison stage, wherein in a multi-part housing (11-16) by comparison and sealing membranes (30-34) divided chambers (24-29) are formed, into which the pressures to be compared are introduced, and being loosely in the housing via the comparison membranes stacked membrane plates (36-39) the resulting force is converted into a corresponding movement of the membrane plates, characterized by the following features: a) the membrane plates (36-39) have central pin attachments (40) and recesses (41), the pin attachment of one membrane plate each in a recess of the adjacent membrane plate via a in the comparison or sealing membrane (31 or 33,34) arranged central hole (35) engages; b) the housing (11-16) and the diaphragm plate (36-39) have ring webs (42) on opposite surfaces, which are pressed into the diaphragms (30-34) for sealing when pressure is applied; and c) at least 2 membrane plates (36, 39) have concentric ring grooves (43) in their flat surfaces, into which the associated membranes (30, 32) engage with concentric ring collars (44). 2. Membranmodul nach Anspruch 1, dadurch gekennzeichnet, daß die zentralen Stiftansätze (40) eine Länge aufweisen, die die Tiefe der zugeordneten zentralen Ausnehmungen (41) um ein definiertes Maß übersteigt, wobei dieses Maß geringer als die Dicke der dazwischen angeordneten Vergleichs- oder Dichtmembran (30-34) ist.2. Membrane module according to claim 1, characterized in that the central pin approaches (40) have a length that exceeds the depth of the assigned central recesses (41) by a defined amount, this amount being less than the thickness of the comparison or sealing membrane (30-34) arranged therebetween. 3. Membranmodul nach Anspruch 1, dadurch gekennzeichnet, daß die Ringnuten (43) in den Außenflächen der das Tellerpaket abschließenden Membranteller (36,39) angeordnet sind.3. Membrane module according to claim 1, characterized in that the annular grooves (43) are arranged in the outer surfaces of the membrane plate closing the plate pack (36,39).
EP83100988A 1982-02-06 1983-02-03 Membrane module for a pneumatic control system Expired EP0085945B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3204100 1982-02-06
DE19823204100 DE3204100A1 (en) 1982-02-06 1982-02-06 MEMBRANE MODULE FOR PNEUMATIC CONTROL SYSTEMS

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EP0085945A1 true EP0085945A1 (en) 1983-08-17
EP0085945B1 EP0085945B1 (en) 1985-10-30

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WO1997016626A1 (en) * 1995-11-02 1997-05-09 Tetra Laval Holdings & Finance S.A. Piston diaphragm assembly
US5927177A (en) * 1997-12-22 1999-07-27 Tol-O-Matic, Inc. Multi-diaphragm actuator
US6286413B1 (en) 1998-02-20 2001-09-11 Tol-O-Matic, Inc. Diaphragm actuator
US8534315B2 (en) * 2008-05-16 2013-09-17 Fisher Controls International Llc Diaphragm assemblies for use with fluid control devices
JP5608599B2 (en) * 2011-03-30 2014-10-15 アズビル株式会社 Pilot relay
US10338611B2 (en) * 2017-09-13 2019-07-02 Unilok Corporation Regulator
CN109027397B (en) * 2018-08-27 2019-03-26 辰星仪表（成都）有限公司 A kind of pneumatic amplifier
DE102018215300A1 (en) * 2018-09-07 2020-03-12 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Pneumatic actuator, exhaust system, housing with exhaust system, pneumatic actuator

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FR2034260A2 (en) * 1969-03-05 1970-12-11 Valves Et Produits Indls
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FR1396001A (en) * 1964-04-21 1965-04-16 Robertshaw Controls Co Pneumatic relay
FR2034260A2 (en) * 1969-03-05 1970-12-11 Valves Et Produits Indls
DE2205188A1 (en) * 1971-02-17 1972-08-31 Philips Nv Fluid-operated function module for a system for building fluid-operated circuits
FR2300923A1 (en) * 1975-02-14 1976-09-10 Foxboro Co PNEUMATIC LOGIC UNIT
DE2529457A1 (en) * 1975-07-02 1977-01-13 Honeywell Gmbh MEMBRANE MODULE FOR PNEUMATIC CONTROL SYSTEMS

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DE3361089D1 (en) 1985-12-05
US4522220A (en) 1985-06-11
EP0085945B1 (en) 1985-10-30
DE3204100A1 (en) 1983-08-18

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