EP0191011B1 - Elektrisch-pneumatischer Signalwandler - Google Patents

Elektrisch-pneumatischer Signalwandler 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
Authority
EP
European Patent Office
Prior art keywords
bending element
piezoelectric bending
signal converter
converter according
guide spring
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
EP86890017A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0191011A1 (de
Inventor
Herbert Frisch
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.)
CESSIONE;HOERBIGER VENTILWERKE AKTIENGESELLSCHAFT
Original Assignee
ENFO Grundlagen Forschungs AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ENFO Grundlagen Forschungs AG filed Critical ENFO Grundlagen Forschungs AG
Publication of EP0191011A1 publication Critical patent/EP0191011A1/de
Application granted granted Critical
Publication of EP0191011B1 publication Critical patent/EP0191011B1/de
Expired legal-status Critical Current

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Classifications

    • 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.

Landscapes

  • 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)
EP86890017A 1985-02-08 1986-02-03 Elektrisch-pneumatischer Signalwandler Expired EP0191011B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT371/85 1985-02-08
AT0037185A AT382431B (de) 1985-02-08 1985-02-08 Elektrisch-pneumatischer signalwandler

Publications (2)

Publication Number Publication Date
EP0191011A1 EP0191011A1 (de) 1986-08-13
EP0191011B1 true EP0191011B1 (de) 1988-06-08

Family

ID=3488818

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86890017A Expired EP0191011B1 (de) 1985-02-08 1986-02-03 Elektrisch-pneumatischer Signalwandler

Country Status (6)

Country Link
US (1) US4625139A (es)
EP (1) EP0191011B1 (es)
JP (1) JPS61228103A (es)
AT (1) AT382431B (es)
DE (1) DE3660291D1 (es)
ES (1) ES8800561A1 (es)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT398331B (de) * 1992-04-03 1994-11-25 Hoerbiger Fluidtechnik Gmbh Elektro-pneumatischer signalwandler
DE102007034048B3 (de) * 2007-07-20 2008-06-12 Hoerbiger Automatisierungstechnik Holding Gmbh Piezoelektrisches Ventil
DE102007034049B3 (de) * 2007-07-19 2008-06-12 Hoerbiger Automatisierungstechnik Holding Gmbh Piezoelektrisches Ventil
EP2017511A1 (de) 2007-07-19 2009-01-21 Hoerbiger Automatisierungstechnik Holding GmbH Piezoelektrisches Ventil

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6280301A (ja) * 1985-10-03 1987-04-13 Yamatake Honeywell Co Ltd 電気−空気圧変換器
AT393174B (de) * 1989-05-19 1991-08-26 Enfo Grundlagen Forschungs Ag Signalwandler
AT396392B (de) * 1991-09-30 1993-08-25 Hoerbiger Fluidtechnik Gmbh Piezo-ventil
DE29718306U1 (de) 1997-10-15 1998-01-22 Bürkert Werke GmbH & Co., 74653 Ingelfingen Piezoventil
GB9922069D0 (en) 1999-09-17 1999-11-17 Technolog Ltd Water distribution pressure control method and apparatus
DE10161888A1 (de) * 2001-08-14 2003-02-27 Continental Teves Ag & Co Ohg Piezoelektrisch betätigtes Fluidventil
US6703761B2 (en) * 2001-12-21 2004-03-09 Caterpillar Inc Method and apparatus for restraining temperature induced deformation of a piezoelectric device
DE102010051743B4 (de) 2010-11-19 2022-09-01 C. Miethke Gmbh & Co. Kg Programmierbares Hydrocephalusventil
GB2568546B (en) 2017-11-21 2022-10-05 Haldex Brake Prod Ab A valve and valve component
WO2019101817A1 (en) 2017-11-21 2019-05-31 Haldex Brake Products Ab A valve and a valve assembly

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3519009A (en) * 1968-09-10 1970-07-07 Eastman Kodak Co Fluidic-electro transducer
US3965376A (en) * 1973-02-07 1976-06-22 Gould Inc. Pulsed droplet ejecting system
US4492360A (en) * 1982-06-07 1985-01-08 The Lee Company Piezoelectric valve
US4545561A (en) * 1982-07-30 1985-10-08 Mcdonnell Douglas Corporation Piezoelectric valve operator
US4450375A (en) * 1982-11-12 1984-05-22 Kiwi Coders Corporation Piezoelectric fluid control device
AT380934B (de) * 1983-01-13 1986-07-25 Enfo Grundlagen Forschungs Ag Elektrisch-pneumatischer signalwandler

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT398331B (de) * 1992-04-03 1994-11-25 Hoerbiger Fluidtechnik Gmbh Elektro-pneumatischer signalwandler
DE102007034049B3 (de) * 2007-07-19 2008-06-12 Hoerbiger Automatisierungstechnik Holding Gmbh Piezoelektrisches Ventil
DE202008001289U1 (de) 2007-07-19 2008-08-28 Hoerbiger Automatisierungstechnik Holding Gmbh Piezoelektrisches Ventil
EP2017511A1 (de) 2007-07-19 2009-01-21 Hoerbiger Automatisierungstechnik Holding GmbH Piezoelektrisches Ventil
DE102007033529A1 (de) 2007-07-19 2009-01-22 Hoerbiger Automatisierungstechnik Holding Gmbh Piezoelektrisches Ventil
DE102007034048B3 (de) * 2007-07-20 2008-06-12 Hoerbiger Automatisierungstechnik Holding Gmbh Piezoelektrisches Ventil

Also Published As

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

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