EP0085945B1 - Membrane module for a pneumatic control system - Google Patents

Membrane module for a pneumatic control system Download PDF

Info

Publication number
EP0085945B1
EP0085945B1 EP83100988A EP83100988A EP0085945B1 EP 0085945 B1 EP0085945 B1 EP 0085945B1 EP 83100988 A EP83100988 A EP 83100988A EP 83100988 A EP83100988 A EP 83100988A EP 0085945 B1 EP0085945 B1 EP 0085945B1
Authority
EP
European Patent Office
Prior art keywords
membrane
membranes
disks
tightening
comparing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83100988A
Other languages
German (de)
French (fr)
Other versions
EP0085945A1 (en
Inventor
Vladimir Dr. Multrus
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.)
Honeywell GmbH
Original Assignee
Honeywell GmbH
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 Honeywell GmbH filed Critical Honeywell GmbH
Publication of EP0085945A1 publication Critical patent/EP0085945A1/en
Application granted granted Critical
Publication of EP0085945B1 publication Critical patent/EP0085945B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • 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.
  • Membrane modules of this type can be used in devices for regulating or controlling controlled variables, in particular in pressure-medium-operated controllers, ratio relays, addition relays or the like.
  • known devices of this type as described, for example, in the book by Hengstenberg, “Measures and Rules 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 membrane plate in the membranes, as well as the implementation and fixation of this web, makes it difficult with these known so-called bushing regulators to center the entire membrane package and its parallel alignment with respect to the nozzle of the force / pressure converter.
  • a pneumatic membrane module known from DE-A-2529457.
  • 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 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 a known pressure divider of the type described in DE-A-2 509 963. 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 from one another 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 matched to the length of the pin attachments 40 such that ring webs 42 on the membrane plates are pressed into the comparison and sealing membranes between the membrane plates by a defined amount and achieve a corresponding sealing effect.
  • the final meme of the package Brant plates 36, 39 and comparison membranes 30, 32 have a special design 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 again shows schematically the pneumatic membrane module according to FIG. 1 and its signal application.
  • the module has the function of a pneumatic P controller, with a target / actual value comparison being carried out on the central comparison membrane by connecting the pressures Pw and p x .
  • 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, depending on the setpoint / actual value comparison.
  • This output pressure P A applied in the sense of a negative feedback from the bottom and in the sense of a positive feedback from above the membrane / plate package.
  • 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 already been described in principle in DE-A-2 529 457 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 membrane 45 and a cover plate 46 are arranged under the pressure divider 17, the cover plate 46 serving in a manner not shown to accommodate compressed air channels.
  • 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 p x exceeds the starting point pressure Pw .
  • the initial pressure p can be shifted overall in the ordinate direction. This fact can be found in more detail in the aforementioned DE-A-2529457.

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 Membranmodule können in Einrichtungen zum Regeln oder Steuern von Regelgrößen, insbesondere bei druckmittelbetriebenen Reglern, Verhältnisrelais, 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 parallele Ausrichtung 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 gesamte Aufbau aufwendiger, was einer Miniaturisierung der Einrichtung hinderlich im Wege steht.Membrane modules of this type can be used in devices for regulating or controlling controlled variables, in particular in 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, “Measures and Rules 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 membrane plate in the membranes, as well as the implementation and fixation of this web, makes it difficult with these known so-called bushing regulators to center the entire membrane 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 areas, double diaphragms with a bead and with a vented space are used in the known bush regulators. This not only doubles the number of membranes required, it also makes the entire structure more complex, which hinders miniaturization of the device.

In dieser Hinsicht wird durch einen aus der DE-A-2529457 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-A-2529457. 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. Anhand von in den Figuren der beiliegenden Zeichnung dargestellten Ausführungsbeispielen sei im folgenden die Erfindung näher erläutert.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. The invention is explained in more detail below on the basis of exemplary embodiments illustrated in the figures of the accompanying drawing.

Es zeigen :

  • Figur 1 den konstruktiven Aufbau eines erfindungsgemäßen Membranmoduls erster Ausführung in einem Axialschnitt ;
  • Figur 1a den schematischen Aufbau des Membranmoduls gemäß Figur 1 zusammen mit seiner Beschaltung zur Erläuterung von dessen Funktion ;
  • Figur 2 den konstruktiven Aufbau eines erfindungsgemäßen Membranmoduls zweiter Ausführungsform in einem Axialschnitt ; und
  • Figur 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 :
  • 1 shows the structural design of a membrane module according to the invention of the first embodiment in an axial section;
  • Figure 1a shows the schematic structure of the membrane module according to Figure 1 together with its circuitry to explain its function;
  • Figure 2 shows the structural design of a membrane module of the second embodiment according to the invention in an axial section; and
  • 2a shows the schematic structure of the membrane module according to FIG. 2 together with its circuitry to explain its function as a ratio module with an 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-A-2 509 963 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 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. In principle, the pressure divider 17 is a known pressure divider of the type described in DE-A-2 509 963. 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 Vergleichsmembranen 30, 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 from one another 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 matched to the length of the pin attachments 40 such that ring webs 42 on the membrane plates are pressed into the comparison and sealing membranes between the membrane plates by a defined amount and achieve a corresponding sealing effect.

Die das Paket jeweils abschließenden Membranteller 36, 39 und Vergleichsmembranen 30, 32 weises 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 final meme of the package Brant plates 36, 39 and comparison membranes 30, 32 have a special design 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.

Figur 1a 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 p, einstellt. Dieser Ausgangsdruck pa 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.FIG. 1a again shows schematically the pneumatic membrane module according to FIG. 1 and its signal application. As the person skilled in the art easily recognizes, the module has the function of a pneumatic P controller, with a target / actual value comparison being carried out on the central comparison membrane by connecting the pressures Pw and p x . 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, depending on the setpoint / actual value comparison. This output pressure P A applied in the sense of a negative feedback from the bottom and in the sense of a positive feedback from above the membrane / plate package. 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-A-2 529 457 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 Ausdruckt 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 näher 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 already been described in principle in DE-A-2 529 457 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 membrane 45 and a cover plate 46 are arranged under the pressure divider 17, the cover plate 46 serving in a manner not shown to accommodate compressed air channels.

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 p, insgesamt in Ordinatenrichtung verschieben. Dieser Sachverhalt läßt sich aus der zuvor erwähnten DE-A-2529457 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 p x exceeds the starting point pressure Pw . By introducing the pressure p m , the initial pressure p can be shifted overall in the ordinate direction. This fact can be found in more detail in the aforementioned DE-A-2529457.

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. Membrane module for pneumatic control systems comprising at least one pressure comparison stage (31, 37, 38) for converting a pressure difference into a force, and a force/pres- sure transducer (11, 30, 36) being controlled by the pressure comparison stage, wherein in a multiple-part housing (11-16) chambers (24-29) are formed which are separated by comparing and tightening membranes (30-34) with the pressures to be compared with each other being fed to said chambers and wherein by means of membrane disks (36-39) loosely piled up in the housing and being admitted by the comparing membranes the resulting force is accordingly converted into a displacement of the membrane disks, characterized by the following features :
a) said membrane disks (36-39) comprise central pin projections (40) and recesses (41), wherein said pin projection of a membrane disk is inserted into a recess of an adjacent membrane disk via a central hole (35) provided in a corresponding one of said comparing or tightening membranes (31 or 33, 34), respectively ;
b) said housing (11-16) and the membrane disks (36-39) comprise annular ribs at adjacent surfaces which are pressed into corresponding membranes for tightening when pressure is applied ; and
c) at least two membrane disks (36, 39) comprise in their plane surfaces concentric annular grooves (43) which are engaged by annular collars (44) of related membranes.
2. Membrane module according to claim 1, characterized in that the central pin projections (40) comprise a length which exceeds the depth of the related central recesses (41) by a certain amount with said amount being smaller than the thickness of the intermediately arranged comparing or tightening membranes (30-34), respectively.
3. Membrane module according to claim 1, characterized in that the annular grooves (43) are provided in the outer surfaces of the membrane disks (36, 39) terminating the package of membrane disks.
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

Publications (2)

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

Family

ID=6154970

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83100988A Expired EP0085945B1 (en) 1982-02-06 1983-02-03 Membrane module for a pneumatic control system

Country Status (3)

Country Link
US (1) US4522220A (en)
EP (1) EP0085945B1 (en)
DE (2) DE3204100A1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4322958C2 (en) * 1993-07-09 1996-11-21 Freudenberg Carl Fa Active control element
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

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3169402A (en) * 1961-08-16 1965-02-16 Sheffield Corp Pressure differential gage
FR1396001A (en) * 1964-04-21 1965-04-16 Robertshaw Controls Co Pneumatic relay
US3461896A (en) * 1966-07-01 1969-08-19 Johnson Service Co Fluid proportional controller
FR2034260B2 (en) * 1969-03-05 1973-10-19 Valves Et Produits Indls
NL7102074A (en) * 1971-02-17 1972-08-21
FR2300923A1 (en) * 1975-02-14 1976-09-10 Foxboro Co PNEUMATIC LOGIC UNIT
DE2529457C3 (en) * 1975-07-02 1982-03-25 Honeywell Gmbh, 6000 Frankfurt Membrane module for pneumatic control systems
US4245549A (en) * 1978-09-18 1981-01-20 Robertshaw Controls Company Control device diaphragm stack and method of making the same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Hengstenberg "Messen und Regeln in der chemischen Technik", Springer Verlag 1964, S. 1159 und 1170 *

Also Published As

Publication number Publication date
EP0085945A1 (en) 1983-08-17
DE3204100A1 (en) 1983-08-18
US4522220A (en) 1985-06-11
DE3361089D1 (en) 1985-12-05

Similar Documents

Publication Publication Date Title
DE3515499A1 (en) Electropneumatic converter
EP0085945B1 (en) Membrane module for a pneumatic control system
DE1673475A1 (en) Device for converting an electrical input signal into a corresponding output signal for a liquid pressure level
DE2029912A1 (en) Valve
DE3034326T1 (en) A SIGNAL CONVERTING UNIT INTENDED TO BE INCORPORATED IN A PNEUMATIC CONTROL SYSTEM
DE1300388B (en) Differential pressure control valve with two inlet channels and one outlet channel
DE1673465B2 (en) Pressure control device
EP0065304A2 (en) Electrohydraulic transmission
DE3402508A1 (en) AMPLIFIER VALVE FOR A HYDRAULIC TWO-STAGE CONTROL DEVICE
DE2441048C3 (en) Diaphragm valve
EP0100784A1 (en) Pressure-limiting valve with electrically adjustable setting
DE4106474C2 (en) Pneumatic pressure regulator with pilot control
EP1711712B1 (en) Differential pressure proportional valve
DE2529457C3 (en) Membrane module for pneumatic control systems
DE2253457A1 (en) DEVICE FOR PROCESSING A FLUIDIC SIGNAL
DE2713998C3 (en) Pneumatic module with time response
DE2416235A1 (en) Hydraulic pressure regulating valve - with control spool positioned by error signal from P-I-D shaping circuit with position feedback
DE2626723B2 (en) Load-dependent braking force regulator
DE2040170C3 (en) Pressure medium operated two-point regulator
DE2343513A1 (en) VALVE RESPONDING TO THE PRESSURE OF A FLUID FROM A FLUID SOURCE
DE2040166C2 (en) Pneumatic amplifier arrangement
DE3228430A1 (en) Continuously adjustable two-way built-in valve
DE2918915A1 (en) Membrane for vacuum brake servo - has ribbed outer structure to roll over inside of housing
EP0301202B1 (en) Valve device for fluids under pressure
DE3504470A1 (en) Pneumatic characteristic converter valve

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): CH DE GB LI SE

17P Request for examination filed

Effective date: 19831208

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): CH DE GB LI SE

REF Corresponds to:

Ref document number: 3361089

Country of ref document: DE

Date of ref document: 19851205

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19911216

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19911217

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19911219

Year of fee payment: 10

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19930203

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19930204

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19930228

Ref country code: CH

Effective date: 19930228

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19930203

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

EUG Se: european patent has lapsed

Ref document number: 83100988.1

Effective date: 19930912

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19990122

Year of fee payment: 17

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20001201