EP0191011B1 - Electropneumatic signal converter - Google Patents

Electropneumatic signal converter Download PDF

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Publication number
EP0191011B1
EP0191011B1 EP86890017A EP86890017A EP0191011B1 EP 0191011 B1 EP0191011 B1 EP 0191011B1 EP 86890017 A EP86890017 A EP 86890017A EP 86890017 A EP86890017 A EP 86890017A EP 0191011 B1 EP0191011 B1 EP 0191011B1
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EP
European Patent Office
Prior art keywords
bending element
piezoelectric bending
signal converter
converter according
guide spring
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Expired
Application number
EP86890017A
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German (de)
French (fr)
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EP0191011A1 (en
Inventor
Herbert Frisch
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CESSIONE;HOERBIGER VENTILWERKE AKTIENGESELLSCHAFT
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ENFO Grundlagen Forschungs AG
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Publication of EP0191011A1 publication Critical patent/EP0191011A1/en
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    • 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
    • F15B5/003—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 characterised by variation of the pressure in a nozzle or the like, e.g. nozzle-flapper system

Definitions

  • the invention relates to an electro-pneumatic signal converter, with a piezoelectric bending element, which is arranged in a closed transmitter housing, from which a signal output is led, bends when an electrical voltage is applied and controls a pneumatic signal transmitter, which consists of an air intake seat and a Exhaust air seat is provided, which are provided opposite each other in the transmitter housing, the piezoelectric bending element being biased against the supply air seat by a spring.
  • a signal converter of this type is known from DE-A-3 400 645.
  • the piezoelectric bending element is clamped there with an edge area in the transmitter housing and pressed resiliently onto the supply air seat.
  • an electrical voltage is applied to the piezoelectric bending element, it lifts off the supply air seat and closes the exhaust air seat.
  • the signal output which was vented through the exhaust air seat, is thereby connected to the supply air seat, so that the pressure medium supplied through the supply air seat is present at the signal output as a pneumatic pressure signal.
  • the voltage at the piezoelectric bending element is switched off or reversed, the bending element returns to the starting position, with the signal output being vented again.
  • This electro-pneumatic signal converter is characterized by a low power requirement. It works without significant energy consumption, so that it uses the conventional solenoid valves for the electrical actuation of pneumatic circuits and devices such. B. for pilot control of valves, can advantageously replace.
  • the object of the invention is to improve this signal converter, in particular to simplify manufacture, to guide the piezoelectric bending element more precisely during the control movement and to reduce the response time of the pneumatic part.
  • this object is achieved in that the piezoelectric bending element is arranged in a closely surrounding chamber of the encoder housing, in which support points are provided for this in the axial direction of the bending element, and in that the piezoelectric bending element is held and held against by a link spring anchored in the encoder housing the support points is pressed.
  • the narrow chamber in which the movable bending element is arranged requires precise anchoring and guiding of the bending element, which is achieved by the arrangement of support points according to the invention and in particular by the link spring provided according to the invention. Overall, precise guidance of the piezoelectric bending element is thereby achieved, which enables the signal converter to function advantageously. In addition, despite its constructive and functional accuracy, the arrangement according to the invention is characterized by surprising simplicity.
  • the piezoelectric bending element is supported on a support bearing and at an axial distance therefrom at a tilting point on the transmitter housing, which consists of point or line-shaped tilting bearings which are arranged on both sides of the longitudinal axis of the piezoelectric bending element.
  • the support points are arranged on the encoder housing itself and thus precisely defined in terms of its position.
  • the support bearing can be formed by an electrical contact pin which is inserted into the transmitter housing and which also serves to supply voltage.
  • the link spring which presses the piezoelectric bending element against the support points, can, according to an advantageous embodiment of the invention, on the piezoelectric bending element in an area lying in the axial direction between the support bearing and the tilting area with at least one, preferably punctiform or linear support point, e.g. B. attack over a spherical bead.
  • a defined point of application of the spring force is thereby achieved.
  • the contact point or the contact points of the link spring are provided on an axially extending tongue thereof, which is separated from the edge regions by incisions. This design prevents the point of application of the spring force from being displaced when the link spring is twisted.
  • the link spring can have laterally projecting fastening tabs via the piezoelectric bending element, to which pins held in the encoder housing, preferably at the same time serving for supplying voltage, are attached.
  • the link spring is only clamped between two housing halves in this embodiment, the pins effecting exact centering. Since the supply of the electrical voltage to the piezoelectric bending element expediently takes place via the link spring, there is a simple design if the pins provided for centering also serve as contact pins.
  • the link spring can have holding tabs projecting laterally over the piezoelectric bending element, which are bent around the edges of the piezoelectric bending element and fastened, preferably glued, to the latter.
  • the link spring Since there is only a limited space available for the link spring in the encoder housing, this is expediently designed as a flat spiral spring. It can be bent against the support points and thus deliver the required spring force.
  • the link spring has a tongue which is bent out of the plane of the link spring away from the piezoelectric bending element and is bent at its end against the bending element, the end of the tongue resting on the piezoelectric bending element. The end of the tongue bent in this way can be angular, so that the edge resting on the piezoelectric bending element gives a precisely defined point of application of the spring force.
  • the transmitter housing must of course also be designed such that it supports the guide spring holding and guiding the piezoelectric bending element sufficiently rigidly and sufficiently rigidly in relation to the supply air seat and the exhaust air seat.
  • the encoder housing consists of solid plates made of a rigid material, in which flat recesses are provided for the piezoelectric bending element and its guide spring. The recesses in the plates of the encoder housing closely enclose the piezoelectric bending element and the associated link spring, leaving only the play and the excess necessary for the manufacturing tolerances. With this design, the required small internal volume of the signal converter is ensured without the movements of the piezoelectric bending element and its link spring being impeded by twists or the like.
  • the housing parts are provided.
  • the encoder housing can be made of an electrically insulating material, preferably ceramic or glass. Both materials are sufficiently strong to ensure the required bending stiffness and resistance to twisting.
  • the plates forming the transmitter housing around the recesses lie airtight on one another and are preferably glued to one another.
  • FIG. 1 shows an axial section through a signal converter according to the invention along the line II in FIG. 2
  • FIG. 2 shows a cross section according to the line 11-11 in FIG. 1
  • FIG. 3 shows an axial section along the line 111-111 in FIG. 2nd
  • Fig. 4 shows the link spring used in the embodiment of FIGS. 1 to 3 in longitudinal section and in Figs. 5 and 6 another embodiment of the link spring is shown in plan view and in longitudinal section.
  • the electrical-pneumatic signal converter according to FIGS. 1 to 3 consists of a transmitter housing 1, which forms a tightly closed chamber 2, in which a piezoelectric bending element 3 is arranged. A signal output 4 is led out of the chamber 2. In addition, a supply air seat 5 and an exhaust air seat 6 are inserted in mutually aligned bores of the housing 1. The piezoelectric bending element 3 is held and guided in the chamber 2 by a link spring 7. It controls the supply air seat 5 and the exhaust air seat 6. Contact pins 8 and 9 are inserted into the housing 1 for supplying the electrical voltage to the piezoelectric bending element 3.
  • the encoder housing 1 consists of two solid plates 10 and 11, which consist of rigid, preferably electrically insulating material, for. B. made of ceramic or glass.
  • the chamber 2 is formed from flat recesses 12 and 13 in the plates 10 and 11. 1 and 3 in particular that the recesses 12, 13 in the plates 10, 11 closely enclose the piezoelectric bending element 3 and the associated link spring 7, so that only the required play and the excess necessary for the manufacturing tolerances remain.
  • the two plates 10, 11 lie airtight on one another, preferably they are glued to one another.
  • the piezoelectric bending element 3 is supported in the chamber 2 at two points which are spaced apart in the axial direction of the bending element 3.
  • One support point consists of a support bearing 14, which in the exemplary embodiment is formed by the lower end of the contact pin 8. This is inserted with a sleeve 15, which advantageously consists of electrically insulating material, in a bore in the plate 11 of the transmitter housing 1.
  • the other support point is designed as a tilting point and consists of two tilting bearings 16, which protrude from the plate 11 into the chamber 2 in the form of a knob. In Fig. 2, the two tilt bearings 16 are shown in dashed lines.
  • the link spring 7, which is shown in plan view in FIG. 2 and in a longitudinal section in FIG. 4, has the task of pressing the piezoelectric bending element 3 against the two support points 14 and 16. It engages with a point-shaped support point 17, which is formed by a spherical bead, on the piezoelectric bending element 3, u. between in an axial direction between the Support bearing 14 and the tilt bearing 16 area. From Fig. 2 it can be seen that the support point 17 is provided on a tongue 18 which is formed by side incisions 19. On the encoder housing 1, the link spring 7 is fastened by tabs which protrude laterally beyond the piezoelectric bending element 3 and are clamped between the two plates 10 and 11 of the encoder housing 1.
  • the contact pins 9 anchored in the encoder housing 1 engage in bores in the tabs 20.
  • the voltage is also supplied via the contact spring 7 to the piezoelectric bending element 3.
  • a bead 21 running between the tabs 20 transversely to the link spring 7 forms a stiffening.
  • the bent edge 22 of the link spring 7, which projects into a groove 23 in the plate 10 of the transmitter housing 1, serves the same purpose and also for additional centering.
  • the link spring 7 also has laterally projecting retaining tabs 24, which are bent over the piezoelectric bending element 3 and hold it in place. In this way, the piezoelectric bending element 3 is held securely and precisely guided by the link spring 7 in the transmitter housing 1.
  • the link spring 7 shown in FIG. 4 is bent upward in the direction of the holding tabs 24 which hold the piezoelectric bending element not shown there, as a result of which the spring force is achieved.
  • the link spring 7 according to FIGS. 5 and 6 differs from this embodiment in that it has a tongue 25, which is first bent downwards, away from the retaining tabs 24, out of the level of the link spring 7 and then with its end upwards is angled.
  • the end of the tongue 25 thus forms a linear support point 14 with which the link spring 7 rests on the piezoelectric bending element 3.
  • laterally projecting fastening tabs 20 are also provided for fastening the link spring 7 in the transmitter housing 1 and retaining tabs 24 for anchoring the piezoelectric bending element 3.
  • the tongue 25 is separated from the edges of the link spring 7 by side incisions 26.
  • the piezoelectric bending element 3 is securely fastened by the link spring 7 in the transmitter housing 1 and guided precisely. It presses the piezoelectric bending element 3 against the two support points, the support bearing 14 and the tilting bearing 16, which are mutually aligned so that the end of the piezoelectric bending element 3 is pressed onto the supply air seat 5 and seals it tightly.
  • the signal output 4 is connected to the exhaust air seat 6 via the chamber 2 and is thus relieved of pressure.
  • the piezoelectric bending element bends, lifting off from the supply air seat 5 and closing the exhaust air seat 6.
  • the pressure medium supplied through the supply air seat 5 can then pass into the chamber 2 and from there to the signal output 4, as a result of which the supplied electrical signal is converted into a pneumatic pressure signal.
  • the piezoelectric bending element 3 returns to the starting position, the signal output 4 being relieved of pressure again.
  • the recesses 12, 13 in the plates 10, 11 of the encoder housing 1 enclose the piezoelectric bending element 3 and the associated link spring 7 very closely, so that only the required play and the excess necessary for the manufacturing tolerances remain.
  • the chamber 2 therefore has a small volume. Only small amounts of pneumatic pressure medium are required to fill it, which means that short valve switching times can be achieved.
  • the three-point support of the piezoelectric bending element 3 on the plate 11 of the encoder housing 1, u. between the support bearing 14 and the two tilting bearings 16, enables a precise adjustment of the position of the bending element 3 between the supply air seat 5 and the exhaust air seat 6.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Description

Die Erfindung bezieht sich auf einen elektrischpneumatischen Signalwandler, mit einem piezoelektrischen Biegeelement, das in einem abgeschlossenen Gebergehäuse, aus dem ein Signalausgang herausgeführt ist, angeordnet ist, sich beim Anlegen einer elektrischen Spannung biegt und hierbei einen pneumatischen Signalgeber steuert, der aus einem Zuluftsitz und einem Abluftsitz besteht, die einander gegenüberliegend im Gebergehäuse vorgesehen sind, wobei das piezoelektrische Biegeelement durch eine Feder gegen den Zuluftsitz vorgespannt ist.The invention relates to an electro-pneumatic signal converter, with a piezoelectric bending element, which is arranged in a closed transmitter housing, from which a signal output is led, bends when an electrical voltage is applied and controls a pneumatic signal transmitter, which consists of an air intake seat and a Exhaust air seat is provided, which are provided opposite each other in the transmitter housing, the piezoelectric bending element being biased against the supply air seat by a spring.

Ein Signalwandler dieser Bauart ist aus der DE-A-3 400 645 bekannt. Das piezoelektrische Biegeelement ist dort mit einem Randbereich im Gebergehäuse eingespannt und federnd auf den Zuluftsitz gedrückt. Sobald eine elektrische Spannung an das piezoelektrische Biegeelement angelegt wird, hebt sich dieses vom Zuluftsitz ab und verschließt den Abluftsitz. Der Signalausgang, der durch den Abluftsitz entlüftet war, wird dadurch mit dem Zuluftsitz verbunden, so daß das durch den Zuluftsitz zugeführte Druckmedium am Signalausgang als pneumatisches Drucksignal ansteht. Sobald die Spannung am piezoelektrischen Biegeelement abgeschaltet oder umgepolt wird, kehrt das Biegeelement in die Ausgangslage zurück, wobei der Signalausgang wieder entlüftet wird. Dieser elektrisch-pneumatische Signalwandler zeichnet sich durch einen geringen Leistungsbedarf aus. Er arbeitet ohne nennenswerten Energieverbrauch, so daß er die herkömmlichen Magnetventile für die elektrische Betätigung pneumatischer Schaltkreise und Geräte, z. B. zur Vorsteuerung von Ventilen, vorteilhaft ersetzen kann.A signal converter of this type is known from DE-A-3 400 645. The piezoelectric bending element is clamped there with an edge area in the transmitter housing and pressed resiliently onto the supply air seat. As soon as an electrical voltage is applied to the piezoelectric bending element, it lifts off the supply air seat and closes the exhaust air seat. The signal output, which was vented through the exhaust air seat, is thereby connected to the supply air seat, so that the pressure medium supplied through the supply air seat is present at the signal output as a pneumatic pressure signal. As soon as the voltage at the piezoelectric bending element is switched off or reversed, the bending element returns to the starting position, with the signal output being vented again. This electro-pneumatic signal converter is characterized by a low power requirement. It works without significant energy consumption, so that it uses the conventional solenoid valves for the electrical actuation of pneumatic circuits and devices such. B. for pilot control of valves, can advantageously replace.

Die Erfindung hat eine Verbesserung dieses Signalwandlers zum Gegenstand, insbesondere eine Vereinfachung der Herstellung, eine genauere Führung des piezoelektrischen Biegeelementes während der Steuerbewegung und eine Verringerung der Ansprechzeit des pneumatischen Teils.The object of the invention is to improve this signal converter, in particular to simplify manufacture, to guide the piezoelectric bending element more precisely during the control movement and to reduce the response time of the pneumatic part.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß das piezoelektrische Biegeelement in einer es eng umschließenden Kammer des Gebergehäuses angeordnet ist, in der in Achsrichtung des Biegeelementes voneinander entfernte Abstützstellen für dieses vorgesehen sind, und daß das piezoelektrische Biegeelement durch eine im Gebergehäuse verankerte Lenkerfeder gehalten und gegen die Abstützstellen gedrückt ist. Mit der weitgehenden Verkleinerung des Volumens der Kammer des abgeschlossenen Gebergehäuses ergeben sich auch bei kleinen pneumatischen Durchflußmengen durch den Signalwandler kleine Ansprechzeiten, so daß, z. B. bei der Vorsteuerung von pneumatischen Ventilen, kurze Ventilschaltzeiten erreicht werden können. Die enge Kammer in der das bewegliche Biegeelement angeordnet ist, erfordert eine genaue Verankerung und Führung des Biegeelementes, was durch die erfindungsgemäße Anordnung von Abstützstellen und insbesondere durch die gemäß der Erfindung vorgesehene Lenkerfeder erreicht wird. Insgesamt wird dadurch eine präzise Führung des piezoelektrischen Biegeelementes verwirklicht, die eine vorteilhafte Funktion des Signalwandlers ermöglicht. Darüber hinaus zeichnet sich die erfindungsgemäße Anordnung trotz ihrer konstruktiven und funktionellen Genauigkeit durch überraschende Einfachheit aus.According to the invention, this object is achieved in that the piezoelectric bending element is arranged in a closely surrounding chamber of the encoder housing, in which support points are provided for this in the axial direction of the bending element, and in that the piezoelectric bending element is held and held against by a link spring anchored in the encoder housing the support points is pressed. With the substantial reduction in the volume of the chamber of the closed encoder housing, small response times result even with small pneumatic flow rates through the signal converter, so that, for. B. in the pilot control of pneumatic valves, short valve switching times can be achieved. The narrow chamber in which the movable bending element is arranged requires precise anchoring and guiding of the bending element, which is achieved by the arrangement of support points according to the invention and in particular by the link spring provided according to the invention. Overall, precise guidance of the piezoelectric bending element is thereby achieved, which enables the signal converter to function advantageously. In addition, despite its constructive and functional accuracy, the arrangement according to the invention is characterized by surprising simplicity.

Bei einer bevorzugten Ausführungsform der Erfindung ist das piezoelektrische Biegeelement an einem Stützlager und in axialem Abstand von diesem an einer Kippstelle am Gebergehäuse abgestützt, die aus punkt- oder linienförmigen Kipplagern besteht, die auf beiden Seiten der Längsachse des piezoelektrischen Biegeelementes angeordnet sind. Die Abstützstellen sind hiebei am Gebergehäuse selbst angeordnet und damit in ihrer Raumlage genau definiert. Das Stützlager kann von einem in das Gebergehäuse eingesetzten elektrischen Kontaktstift gebildet sein, der zugleich zur Spannungszuführung dient.In a preferred embodiment of the invention, the piezoelectric bending element is supported on a support bearing and at an axial distance therefrom at a tilting point on the transmitter housing, which consists of point or line-shaped tilting bearings which are arranged on both sides of the longitudinal axis of the piezoelectric bending element. The support points are arranged on the encoder housing itself and thus precisely defined in terms of its position. The support bearing can be formed by an electrical contact pin which is inserted into the transmitter housing and which also serves to supply voltage.

Die Lenkerfeder, die das piezoelektrische Biegeelement gegen die Abstützstellen drückt, kann nach einer vorteilhaften Ausführung der Erfindung am piezoelektrischen Biegeelement in einem in axialer Richtung zwischen dem Stützlager und der Kippstelle liegenden Bereich mit wenigstens einer, vorzugsweise punkt- oder linienförmigen Auflagestelle, z. B. über eine kugelförmige Sicke, angreifen. Dadurch wird ein definierter Angriffspunkt der Federkraft erreicht. Vorzugsweise sind die Auflagestelle bzw. die Auflagestellen der Lenkerfeder auf einer axial verlaufenden Zunge derselben vorgesehen, die durch Einschnitte von den Randbereichen getrennt ist. Mit dieser Ausbildung wird verhindert, daß der Angriffspunkt der Federkraft bei einer Verwindung der Lenkerfeder verschoben wird.The link spring, which presses the piezoelectric bending element against the support points, can, according to an advantageous embodiment of the invention, on the piezoelectric bending element in an area lying in the axial direction between the support bearing and the tilting area with at least one, preferably punctiform or linear support point, e.g. B. attack over a spherical bead. A defined point of application of the spring force is thereby achieved. Preferably, the contact point or the contact points of the link spring are provided on an axially extending tongue thereof, which is separated from the edge regions by incisions. This design prevents the point of application of the spring force from being displaced when the link spring is twisted.

Für die Befestigung der Lenkerfeder im Gebergehäuse kann die Lenkerfeder über das piezoelektrische Biegeelement seitlich vorragende Befestigungslaschen besitzen, an denen im Gebergehäuse gehaltene Stifte, vorzugsweise gleichzeitig zur Spannungszuführung dienende Kontaktstifte, befestigt sind. Die Lenkerfeder wird bei dieser Ausbildung lediglich zwischen zwei Gehäusehälften eingespannt, wobei die Stifte eine genaue Zentrierung bewirken. Da die Zuführung der elektrischen Spannung zum piezoelektrischen Biegeelement zweckmäßig über die Lenkerfeder erfolgt, ergibt sich eine einfache Bauart, wenn die für die Zentrierung vorgesehenen Stifte zugleich als Kontaktstifte dienen.For the attachment of the link spring in the encoder housing, the link spring can have laterally projecting fastening tabs via the piezoelectric bending element, to which pins held in the encoder housing, preferably at the same time serving for supplying voltage, are attached. The link spring is only clamped between two housing halves in this embodiment, the pins effecting exact centering. Since the supply of the electrical voltage to the piezoelectric bending element expediently takes place via the link spring, there is a simple design if the pins provided for centering also serve as contact pins.

Neben der Befestigung der Lenkerfeder im Gehäuse ist beim erfindungsgemäßen Signalwandler eine feste Verbindung zwischen der Lenkerfeder und dem piezoelektrischen Biegeelement erforderlich. Die Lenkerfeder kann für diesen Zweck über das piezoelektrische Biegeelement seitlich vorragende Haltelaschen besitzen, die um die Ränder des piezoelektrischen Biegeelementes herumgebogen und an diesem befestigt, vorzugsweise festgeklebt sind.In addition to the attachment of the link spring in the housing in the signal converter according to the invention there is a fixed connection between the link spring and the piezoelectric bending element. For this purpose, the link spring can have holding tabs projecting laterally over the piezoelectric bending element, which are bent around the edges of the piezoelectric bending element and fastened, preferably glued, to the latter.

Da für die Lenkerfeder im Gebergehäuse nur ein beschränkter Raum zur Verfügung steht, ist diese zweckmäßig als flache Biegefeder ausgebildet. Sie kann gegen die Abstützstellen aufgebogen sein und so die erforderliche Federkraft liefern. Bei einer weiteren Ausführung der Erfindung besitzt die Lenkerfeder eine Zunge, die vom piezoelektrischen Biegeelement weg aus der Ebene der Lenkerfeder herausgebogen und mit ihrem Ende gegen das Biegeelement abgewinkelt ist, wobei das Ende der Zunge auf dem piezoelektrischen Biegeelement aufliegt. Das Ende der so abgewinkelten Zunge kann kantig ausgeführt sein, so daß die auf dem piezoelektrischen Biegeelement aufliegende Kante eine genau definierte Angriffstelle der Federkraft ergibt.Since there is only a limited space available for the link spring in the encoder housing, this is expediently designed as a flat spiral spring. It can be bent against the support points and thus deliver the required spring force. In a further embodiment of the invention, the link spring has a tongue which is bent out of the plane of the link spring away from the piezoelectric bending element and is bent at its end against the bending element, the end of the tongue resting on the piezoelectric bending element. The end of the tongue bent in this way can be angular, so that the edge resting on the piezoelectric bending element gives a precisely defined point of application of the spring force.

Beim erfindungsgemäßen Signalwandler muß natürlich auch das Gebergehäuse so ausgebildet sein, daß es die das piezoelektrische Biegeelement haltende und führende Lenkerfeder ausreichend genau und im Verhältnis zum Zuluftsitz und zum Abluftsitz genügend starr abstützt. Um dies zu erreichen, besteht das Gebergehäuse aus massiven Platten eines starren Werkstoffes, in denen flache Ausnehmungen für das piezoelektrische Biegeelement und dessen Lenkerfeder vorgesehen sind. Die Ausnehmungen in den Platten des Gebergehäuses umschließen eng das piezoelektrische Biegeelement und die zugehörige Lenkerfeder unter Freilassung lediglich des Bewegungsspiels und des für die Fertigungstoleranzen notwendigen Übermaßes. Mit dieser Ausbildung wird das erforderliche kleine Eigenvolumen des Signalwandler sichergestellt, ohne daß die Bewegungen des piezoelektrischen Biegeelementes und dessen Lenkerfeder durch Verwindungen od. dgl. der Gehäuseteile behindert werden.In the signal converter according to the invention, the transmitter housing must of course also be designed such that it supports the guide spring holding and guiding the piezoelectric bending element sufficiently rigidly and sufficiently rigidly in relation to the supply air seat and the exhaust air seat. To achieve this, the encoder housing consists of solid plates made of a rigid material, in which flat recesses are provided for the piezoelectric bending element and its guide spring. The recesses in the plates of the encoder housing closely enclose the piezoelectric bending element and the associated link spring, leaving only the play and the excess necessary for the manufacturing tolerances. With this design, the required small internal volume of the signal converter is ensured without the movements of the piezoelectric bending element and its link spring being impeded by twists or the like. The housing parts.

Um die Spannungsversorgung des piezoelektrischen Biegeelementes zu erleichtern, kann das Gebergehäuse aus einem elektrisch isolierenden Werkstoff, vorzugsweise aus Keramik oder Glas bestehen. Beide Werkstoffe sind ausreichend fest, um auch die erforderliche Biegesteifigkeit und Widerstandsfähigkeit gegen Verwindungen zu gewährleisten. Die das Gebergehäuse bildenden Platten um die Ausnehmungen herum liegen luftdicht aufeinander auf und sind vorzugsweise miteinander verklebt.In order to facilitate the voltage supply to the piezoelectric bending element, the encoder housing can be made of an electrically insulating material, preferably ceramic or glass. Both materials are sufficiently strong to ensure the required bending stiffness and resistance to twisting. The plates forming the transmitter housing around the recesses lie airtight on one another and are preferably glued to one another.

Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen, die in den Zeichnungen dargestellt sind. In diesen zeigtFurther details and advantages of the invention emerge from the following description of exemplary embodiments which are illustrated in the drawings. In these shows

Fig. 1 einen Axialschnitt durch einen erfindungsgemäßen Signalwandler nach der Linie I-I in Fig. 2, Fig. 2 dazu einen Querschnitt .nach der Linie 11-11 in Fig. 1 und Fig. 3 einen Axialschnitt nach der Linie 111-111 in Fig. 2.1 shows an axial section through a signal converter according to the invention along the line II in FIG. 2, FIG. 2 shows a cross section according to the line 11-11 in FIG. 1 and FIG. 3 shows an axial section along the line 111-111 in FIG. 2nd

Fig. 4 zeigt die im Ausführungsbeispiel nach den Fig. 1 bis 3 verwendete Lenkerfeder im Längsschnitt und in den Fig. 5 und 6 ist ein anderes Ausführungsbeispiel der Lenkerfeder in Draufsicht und im Längsschnitt dargestellt.Fig. 4 shows the link spring used in the embodiment of FIGS. 1 to 3 in longitudinal section and in Figs. 5 and 6 another embodiment of the link spring is shown in plan view and in longitudinal section.

Der elektrisch-pneumatische Signalwandler nach den Fig. 1 bis 3 besteht aus einem Gebergehäuse 1, das eine dicht abgeschlossene Kammer 2 bildet, in der ein piezoelektrisches Biegeelement 3 angeordnet ist. Aus der Kammer 2 ist ein Signalausgang 4 herausgeführt. Außerdem sind ein Zuluftsitz 5 und ein Abluftsitz 6 in miteinander fluchtende Bohrungen des Gehäuses 1 eingesetzt. Das piezoelektrische Biegeelement 3 ist durch eine Lenkerfeder 7 in der Kammer 2 gehalten und geführt. Es steuert den Zuluftsitz 5 und den Abluftsitz 6. Für die Zuführung der elektrischen Spannung zum piezoelektrischen Biegeelement 3 sind Kontaktstifte 8 und 9 in das Gehäuse 1 eingesetzt.The electrical-pneumatic signal converter according to FIGS. 1 to 3 consists of a transmitter housing 1, which forms a tightly closed chamber 2, in which a piezoelectric bending element 3 is arranged. A signal output 4 is led out of the chamber 2. In addition, a supply air seat 5 and an exhaust air seat 6 are inserted in mutually aligned bores of the housing 1. The piezoelectric bending element 3 is held and guided in the chamber 2 by a link spring 7. It controls the supply air seat 5 and the exhaust air seat 6. Contact pins 8 and 9 are inserted into the housing 1 for supplying the electrical voltage to the piezoelectric bending element 3.

Das Gebergehäuse 1 besteht aus zwei massiven Platten 10 und 11, die aus starrem, vorzugsweise elektrisch isolierendem Werkstoff bestehen, z. B. aus Keramik oder Glas. Die Kammer 2 ist aus flachen Ausnehmungen 12 und 13 in den Platten 10 und 11 gebildet. Insbesondere aus den Fig. 1 und 3 ist ersichtlich, daß die Ausnehmungen 12, 13 in den Platten 10, 11 das piezoelektrische Biegeelement 3 und die zugehörige Lenkerfeder 7 eng umschließen, so daß lediglich das erforderliche Bewegungsspiel und das für die Fertigungstoleranzen notwendige Übermaß verbleiben. Um die Ausnehmungen 12, 13 herum liegen die beiden Platten 10, 11 luftdicht aufeinander auf, vorzugsweise sind sie miteinander verklebt.The encoder housing 1 consists of two solid plates 10 and 11, which consist of rigid, preferably electrically insulating material, for. B. made of ceramic or glass. The chamber 2 is formed from flat recesses 12 and 13 in the plates 10 and 11. 1 and 3 in particular that the recesses 12, 13 in the plates 10, 11 closely enclose the piezoelectric bending element 3 and the associated link spring 7, so that only the required play and the excess necessary for the manufacturing tolerances remain. Around the recesses 12, 13, the two plates 10, 11 lie airtight on one another, preferably they are glued to one another.

Das piezoelektrische Biegeelement 3 ist in der Kammer 2 an zwei Stellen abgestützt, die in Achsrichtung des Biegeelementes 3 im Abstand voneinander vorgesehen sind. Die eine Abstützstelle besteht aus einem Stützlager 14, das im Ausführungsbeispiel vom unteren Ende des Kontaktstiftes 8 gebildet ist. Dieser ist mit einer Hülse 15, die zweckmäßig aus elektrisch isolierendem Material besteht, in eine Bohrung der Platte 11 des Gebergehäuses 1 eingesetzt. Die andere Abstützstelle ist dagegen als Kippstelle ausgeführt und besteht aus zwei Kipplagern 16, die von der Platte 11 noppenförmig in die Kammer 2 vorragen. In Fig. 2 sind die beiden Kipplager 16 gestrichelt dargestellt.The piezoelectric bending element 3 is supported in the chamber 2 at two points which are spaced apart in the axial direction of the bending element 3. One support point consists of a support bearing 14, which in the exemplary embodiment is formed by the lower end of the contact pin 8. This is inserted with a sleeve 15, which advantageously consists of electrically insulating material, in a bore in the plate 11 of the transmitter housing 1. The other support point, on the other hand, is designed as a tilting point and consists of two tilting bearings 16, which protrude from the plate 11 into the chamber 2 in the form of a knob. In Fig. 2, the two tilt bearings 16 are shown in dashed lines.

Die Lenkerfeder 7, die in Fig. 2 in Draufsicht und in Fig. 4 in einem Längsschnitt dargestellt ist, hat die Aufgabe, das piezoelektrische Biegeelement 3 gegen die beiden Abstützstellen 14 und 16 zu drücken. Sie greift mit einer punktförmigen Auflagestelle 17, die von einer kugelförmigen Sicke gebildet ist, am piezoelektrischen Biegeelement 3 an, u. zw. in einem in axialer Richtung zwischen dem Stützlager 14 und dem Kipplager 16 liegenden Bereich. Aus Fig. 2 ist zu erkennen, daß die Auflagestelle 17 auf einer Zunge 18 vorgesehen ist, die durch seitliche Einschnitte 19 gebildet ist. Am Gebergehäuse 1 ist die Lenkerfeder 7 durch Laschen befestigt, die seitlich über das piezoelektrische Biegeelement 3 vorragen und zwischen den beiden Platten 10 und 11 des Gebergehäuses 1 festgespannt sind. Zur Zentrierung greifen die im Gebergehäuse 1 verankerten Kontaktstifte 9 in Bohrungen in den Laschen 20 ein. Dadurch erfolgt auch die Spannungszuführung über die Kontaktfeder 7 zum piezoelektrischen Biegeelement 3. Eine zwischen den Laschen 20 quer zur Lenkerfeder 7 verlaufende Sicke 21 bildet eine Versteifung. Dem gleichen Zweck und auch zur zusätzlichen Zentrierung dient der umgebogene Rand 22 der Lenkerfeder 7, der in eine Nut 23 in der Platte 10 des Gebergehäuses 1 hineinragt. Im Bereich der Zunge 18 besitzt die Lenkerfeder 7 gleichfalls seitlich vorragende Haltelaschen 24, die über das piezoeletrische Biegeelement 3 umgebogen sind und dieses festhalten. Das piezoeletrische Biegeelement 3 ist auf diese Weise durch die Lenkerfeder 7 im Gebergehäuse 1 sicher gehalten und genau geführt.The link spring 7, which is shown in plan view in FIG. 2 and in a longitudinal section in FIG. 4, has the task of pressing the piezoelectric bending element 3 against the two support points 14 and 16. It engages with a point-shaped support point 17, which is formed by a spherical bead, on the piezoelectric bending element 3, u. between in an axial direction between the Support bearing 14 and the tilt bearing 16 area. From Fig. 2 it can be seen that the support point 17 is provided on a tongue 18 which is formed by side incisions 19. On the encoder housing 1, the link spring 7 is fastened by tabs which protrude laterally beyond the piezoelectric bending element 3 and are clamped between the two plates 10 and 11 of the encoder housing 1. For centering, the contact pins 9 anchored in the encoder housing 1 engage in bores in the tabs 20. As a result, the voltage is also supplied via the contact spring 7 to the piezoelectric bending element 3. A bead 21 running between the tabs 20 transversely to the link spring 7 forms a stiffening. The bent edge 22 of the link spring 7, which projects into a groove 23 in the plate 10 of the transmitter housing 1, serves the same purpose and also for additional centering. In the area of the tongue 18, the link spring 7 also has laterally projecting retaining tabs 24, which are bent over the piezoelectric bending element 3 and hold it in place. In this way, the piezoelectric bending element 3 is held securely and precisely guided by the link spring 7 in the transmitter housing 1.

Die in Fig. 4 gezeigte Lenkerfeder 7 ist nach oben, in Richtung der das dort nicht eingezeichnete piezoelektrische Biegeelement festhaltenden Haltelaschen 24 aufgebogen, wodurch die Federkraft erzielt wird. Die Lenkerfeder 7 nach den Fig. 5 und 6 unterscheidet sich von dieser Ausführung dadurch, daß sie eine Zunge 25 besitzt, die zuerst nach unten, von den Haltelaschen 24 weg, aus der Ebene der Lenkerfeder 7 herausgebogen und daran anschließend mit Ihrem Ende nach oben abgewinkelt ist. Das Ende der Zunge 25 bildet so eine linienförmige Auflagestelle 14, mit der die Lenkerfeder 7 auf dem piezoeletrischen Biegeelement 3 aufliegt. Auch in diesem Ausführungsbeispiel sind seitlich vorragende Befestigungslaschen 20 für die Befestigung der Lenkerfeder 7 im Gebergehäuse 1 und Haltelaschen 24 für die Verankerung des piezoelektrischen Biegeelementes 3 vorgesehen. Die Zunge 25 ist durch seitliche Einschnitte 26 von den Rändern der Lenkerfeder 7 getrennt.The link spring 7 shown in FIG. 4 is bent upward in the direction of the holding tabs 24 which hold the piezoelectric bending element not shown there, as a result of which the spring force is achieved. The link spring 7 according to FIGS. 5 and 6 differs from this embodiment in that it has a tongue 25, which is first bent downwards, away from the retaining tabs 24, out of the level of the link spring 7 and then with its end upwards is angled. The end of the tongue 25 thus forms a linear support point 14 with which the link spring 7 rests on the piezoelectric bending element 3. In this exemplary embodiment, laterally projecting fastening tabs 20 are also provided for fastening the link spring 7 in the transmitter housing 1 and retaining tabs 24 for anchoring the piezoelectric bending element 3. The tongue 25 is separated from the edges of the link spring 7 by side incisions 26.

Aus den Zeichnungen ist zu erkennen, daß das piezoelektrische Biegeelement 3 durch die Lenkerfeder 7 im Gebergehäuse 1 sicher befestigt und genau geführt ist. Sie drückt das piezoelektrische Biegeelement 3 gegen die beiden Abstützstellen, das Stützlager 14 und das Kipplager 16, die gegenseitig so ausgerichtet sind, daß das Ende des piezoelektrischen Biegelementes 3 auf den Zuluftsitz 5 aufgedrückt wird und diesen dicht abschließt. In dieser Stellung, die in Fig. 1 dargestellt ist, steht der Signalausgang 4 über die Kammer 2 mit dem Abluftsitz 6 in Verbindung und ist dadurch druckentlastet. Wenn über die Kontaktstifte 8 und 9 eine elektrische Spannung zugeführt wird, biegt sich das piezoelektrische Biegeelement, wobei es sich vom Zuluftsitz 5 abhebt und den Abluftsitz 6 verschließt. Das durch den Zuluftsitz 5 zugeführte Druckmedium kann hierauf in die Kammer 2 und aus dieser zum Signalausgang 4 gelangen, wodurch das zugeführte elektrische Signal in ein pneumatisches Drucksignal umgewandelt wird. Sobald die Spannungzufuhr aufhört, kehrt das piezoelektrische Biegeelement 3 in die Ausgangsstellung zurück, wobei der Signalausgang 4 wieder druckentlastet wird.From the drawings it can be seen that the piezoelectric bending element 3 is securely fastened by the link spring 7 in the transmitter housing 1 and guided precisely. It presses the piezoelectric bending element 3 against the two support points, the support bearing 14 and the tilting bearing 16, which are mutually aligned so that the end of the piezoelectric bending element 3 is pressed onto the supply air seat 5 and seals it tightly. In this position, which is shown in FIG. 1, the signal output 4 is connected to the exhaust air seat 6 via the chamber 2 and is thus relieved of pressure. When an electrical voltage is supplied via the contact pins 8 and 9, the piezoelectric bending element bends, lifting off from the supply air seat 5 and closing the exhaust air seat 6. The pressure medium supplied through the supply air seat 5 can then pass into the chamber 2 and from there to the signal output 4, as a result of which the supplied electrical signal is converted into a pneumatic pressure signal. As soon as the voltage supply stops, the piezoelectric bending element 3 returns to the starting position, the signal output 4 being relieved of pressure again.

Die Ausnehmungen 12, 13 in den Platten 10, 11 des Gebergehäuses 1 umschließen das piezoelektrische Biegeelement 3 und die zugehörige Lenkerfeder 7 sehr eng, so daß lediglich das erforderliche Bewegungsspiel und das für die Fertigungstoleranzen notwendige Übermaß verbleibt. Die Kammer 2 weist deshalb ein kleines Volumen auf. Es sind zu seiner Auffüllung nur kleine Mengen an pneumatischem Druckmittel erforderlich, wodurch kurze Ventilschaltzeiten erreicht werden können. Die Dreipunktauflage des piezoelektrischen Biegeelementes 3 an der Platte 11 des Gebergehäuses 1, u. zw. am Stützlager 14 und an den beiden Kipplagern 16, ermöglicht eine genaue Einstellung der Lage des Biegeelementes 3 zwischen dem Zuluftsitz 5 und dem Abluftsitz 6. Eine Einstellung ist durch axiale Verstellung des Zuluftsitzes 5 und des Abluftsitzes 6 sowie erforderlichenfalls auch der Hülse 15 des Kontaktstiftes 8 möglich, dessen unteres Ende das Stützlager 14 bildet. Trotz der geringen Auslenkung des piezoelektrischen Biegeelementes 3 ist dadurch eine genaue Justierung des Signalwandlers möglich.The recesses 12, 13 in the plates 10, 11 of the encoder housing 1 enclose the piezoelectric bending element 3 and the associated link spring 7 very closely, so that only the required play and the excess necessary for the manufacturing tolerances remain. The chamber 2 therefore has a small volume. Only small amounts of pneumatic pressure medium are required to fill it, which means that short valve switching times can be achieved. The three-point support of the piezoelectric bending element 3 on the plate 11 of the encoder housing 1, u. between the support bearing 14 and the two tilting bearings 16, enables a precise adjustment of the position of the bending element 3 between the supply air seat 5 and the exhaust air seat 6. An adjustment is by axial adjustment of the supply air seat 5 and the exhaust air seat 6 and, if necessary, also the sleeve 15 of the Contact pin 8 possible, the lower end of which forms the support bearing 14. Despite the small deflection of the piezoelectric bending element 3, an exact adjustment of the signal converter is possible.

Claims (12)

1. An electropneumatic signal converter, having a piezoelectric bending element (3) which is disposed in a closed emitter casing (1) from which a signal output (4) emerges, and bends when an electrical voltage is applied and in this connexion controls a pneumatic signal emitter which comprises an air inlet seating (5) and an air outlet seatlig (6) which are provided opposite each other in the emitter casing (1), the piezoelectric bending element (3) being prestressed against the air inlet seating (5) by a spring (7), characterized in that the piezoelectric bending element (3) is disposed in a chamber (2) of the emitter casing (1) which closely surrounds it and in which support points (14,16) remote from one another are provided for the bending element (3) in the axial direction thereof, and the piezoelectric bending element (3) is held by a guide spring (7) secured in the emitter casing (1) and is pressed against the support points (14, 16).
2. A signal converter according to Claim 1, characterized in that the piezoelectric bending element (3) is supported on a support bearing (14) and at an axial distance from the latter on a rocking point on the emitter casing (1) which comprises punctiform or linear rocker bearings (16) which are arranged on both sides of the longitudinal axis of the piezoelectric bending element (3).
3. A signal converter according to Claim 2, characterized in that the support bearing (14) is formed by an electrical contact pin (8) inserted in the emitter casing (1).
4. A signal converter according to Claim 1, 2 or 3, characterized in that in a region lying in the axial direction between the support bearing (14) and the rocker bearing (16) the guide spring (7) engages with at least one punctiform or linear bearing point (17), e.g. by way of at least one spherical bead, on the piezoelectric bending element (3).
5. A signal converter according to Claim 4, characterized in that the bearing point (17) or the bearing points of the guide spring (7) are provided on an axially extending tongue (18) thereof, which is separated by notches (19) in the edge areas.
6. A signal converter according to any one of Claims 1 to 5, characterized in that the guide spring (7) comprises fastening flaps (20) which project laterally beyond the piezoelectric bending element (3) and to which are secured pins held in the emitter casing (1), preferably contact pins (9) used at the same time for the voltage supply.
7. A signal converter according to any one of Claims 1 to 6, characterized in that the guide spring (7) comprises fastening flaps (24) which project laterally beyond the piezoelectric bending element (3) and which are bent around the edges of the piezoelectric bending element (3) and are secured, and preferably glued, to the latter.
8. A signal converter according to any one of Claims 1 to 7, characterized in that the guide spring (7) comprises a tongue (25) which is bent away from the piezoelectric bending element (3) out of the plane of the guide spring (7) and is angled with its end towards the bending element (3), the end of the tongue (25) bearing as a bearing point (17) on the piezoelectric bending element (3) (Figs. 5 and 6).
9. A signal converter according to any one of Claims 1 to 8, characterized in that the emitter casing (1) comprises solid plates (10,11) of a rigid material, in which flat recesses (12,13) for the piezoelectric bending element (3) and the guide spring (7) thereof are provided.
10. A signal converter according to Claim 9, characterized in that the recesses (12, 13) in the plates (10, 11) of the emitter casing (1) closely enclose the piezoelectric bending element (3) and the associated guide spring while leaving free only the movement clearance and the oversize required for the manufacturing tolerances.
11. A signal converter according to Claim 9 or 10, characterized in that the emitter (1) consists of an electrically insulating material, preferably ceramic material or glass.
12. A signal converter according to Claim 10 or 11, characterised in that the plates (10, 11) forming the emitter casing (1) bear in an air-tight manner upon one another around the recesses (12, 13), and are preferably glued to one another.
EP86890017A 1985-02-08 1986-02-03 Electropneumatic signal converter Expired EP0191011B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT371/85 1985-02-08
AT0037185A AT382431B (en) 1985-02-08 1985-02-08 ELECTRICAL-PNEUMATIC SIGNAL CONVERTER

Publications (2)

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EP0191011A1 EP0191011A1 (en) 1986-08-13
EP0191011B1 true EP0191011B1 (en) 1988-06-08

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US (1) US4625139A (en)
EP (1) EP0191011B1 (en)
JP (1) JPS61228103A (en)
AT (1) AT382431B (en)
DE (1) DE3660291D1 (en)
ES (1) ES8800561A1 (en)

Cited By (4)

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AT398331B (en) * 1992-04-03 1994-11-25 Hoerbiger Fluidtechnik Gmbh ELECTRO-PNEUMATIC SIGNAL CONVERTER
DE102007034049B3 (en) * 2007-07-19 2008-06-12 Hoerbiger Automatisierungstechnik Holding Gmbh Piezoelectric valve has stop provided outside annular face formed by abutting first and second sealing structures and in closed position of flexible element limits deformation of second sealing structure in region of sealing face
DE102007034048B3 (en) * 2007-07-20 2008-06-12 Hoerbiger Automatisierungstechnik Holding Gmbh Piezo-electric valve has flexible pad with valve seat face resting against a jet insert that slides at right angles to the seat
EP2017511A1 (en) 2007-07-19 2009-01-21 Hoerbiger Automatisierungstechnik Holding GmbH Piezo-electric valve

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DE29718306U1 (en) 1997-10-15 1998-01-22 Bürkert Werke GmbH & Co., 74653 Ingelfingen Piezo valve
GB9922069D0 (en) 1999-09-17 1999-11-17 Technolog Ltd Water distribution pressure control method and apparatus
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DE102010051743B4 (en) 2010-11-19 2022-09-01 C. Miethke Gmbh & Co. Kg Programmable hydrocephalus valve
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Cited By (6)

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Publication number Priority date Publication date Assignee Title
AT398331B (en) * 1992-04-03 1994-11-25 Hoerbiger Fluidtechnik Gmbh ELECTRO-PNEUMATIC SIGNAL CONVERTER
DE102007034049B3 (en) * 2007-07-19 2008-06-12 Hoerbiger Automatisierungstechnik Holding Gmbh Piezoelectric valve has stop provided outside annular face formed by abutting first and second sealing structures and in closed position of flexible element limits deformation of second sealing structure in region of sealing face
DE202008001289U1 (en) 2007-07-19 2008-08-28 Hoerbiger Automatisierungstechnik Holding Gmbh Piezoelectric valve
EP2017511A1 (en) 2007-07-19 2009-01-21 Hoerbiger Automatisierungstechnik Holding GmbH Piezo-electric valve
DE102007033529A1 (en) 2007-07-19 2009-01-22 Hoerbiger Automatisierungstechnik Holding Gmbh Piezoelectric valve
DE102007034048B3 (en) * 2007-07-20 2008-06-12 Hoerbiger Automatisierungstechnik Holding Gmbh Piezo-electric valve has flexible pad with valve seat face resting against a jet insert that slides at right angles to the seat

Also Published As

Publication number Publication date
AT382431B (en) 1987-02-25
ATA37185A (en) 1986-07-15
US4625139A (en) 1986-11-25
EP0191011A1 (en) 1986-08-13
DE3660291D1 (en) 1988-07-14
ES8800561A1 (en) 1987-11-01
ES551747A0 (en) 1987-11-01
JPH0578683B2 (en) 1993-10-29
JPS61228103A (en) 1986-10-11

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