EP0565510B1 - Elektro-pneumatischer Signalwandler - Google Patents

Elektro-pneumatischer Signalwandler Download PDF

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Publication number
EP0565510B1
EP0565510B1 EP19930890039 EP93890039A EP0565510B1 EP 0565510 B1 EP0565510 B1 EP 0565510B1 EP 19930890039 EP19930890039 EP 19930890039 EP 93890039 A EP93890039 A EP 93890039A EP 0565510 B1 EP0565510 B1 EP 0565510B1
Authority
EP
European Patent Office
Prior art keywords
bending element
support
support pin
signal converter
adjustment
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 - Lifetime
Application number
EP19930890039
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0565510A3 (enrdf_load_stackoverflow
EP0565510A2 (de
Inventor
Johannes Wirtl
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.)
Hygrama AG
Original Assignee
Hoerbiger Ventilwerke GmbH and Co KG
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 Hoerbiger Ventilwerke GmbH and Co KG filed Critical Hoerbiger Ventilwerke GmbH and Co KG
Publication of EP0565510A2 publication Critical patent/EP0565510A2/de
Publication of EP0565510A3 publication Critical patent/EP0565510A3/xx
Application granted granted Critical
Publication of EP0565510B1 publication Critical patent/EP0565510B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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, the bearing of which consists of a support point having a support bearing and a tilting point having two tilting bearings, the free end of the bending element being a pneumatic signal transmitter which consists of an air intake seat and an exhaust air seat are provided opposite each other in the encoder housing controls and the support bearing has a support pin arranged in a concentric insert sleeve, the position of which is fixed relative to the tilting bearings after the adjustment.
  • a signal converter of the type mentioned is known for example from EP-A-191011.
  • the piezoelectric bending element is held there by a link spring anchored in the transmitter housing, pressed against the support bearing and, for example, bears against the supply air seat under spring preload.
  • an electrical voltage is applied to the bending element, it lifts off the supply air seat and closes the exhaust air seat.
  • the signal output of the signal converter 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 on the piezoelectric bending element is switched off or reversed, the bending element returns to the starting position, the signal output being vented again.
  • This electrical-pneumatic signal converter is characterized by a low power requirement and works without any significant energy consumption, so that it can advantageously replace the conventional solenoid valves for the electrical actuation of pneumatic circuits and devices.
  • the three-point support of the piezoelectric bending element on the support bearings enables an initial adjustment or initial adjustment of the position of the bending element between the seats to be controlled.
  • this initial adjustment in particular also by setting at least one of the three support bearings, the effects on the pneumatic output signal being easily observed.
  • a piezoelectric signal converter is known, for example, from W0 87/02514, in which the bending transducer on the one hand has a clamp that can be adjusted with respect to relative position and pretension by means of screws, and on the other hand acts on a membrane designed as a switching element by means of a push-in element.
  • the adjustability of support and tilting bearings also allows bending elements of different thicknesses to be taken into account, for example.
  • the object of the present invention is to improve a signal converter of the type mentioned at the outset in such a way that the disadvantages described are avoided and that in particular by further mechanical relaxation of the piezoelectric bending element which occurs after the initial adjustment, or also by adjustment errors which are only noticed subsequently Production committee is not increased.
  • the adjustable support bearing is essentially made in two parts.
  • the outer part which is designed as a concentric insertion sleeve, can be secured, as is known, during the initial adjustment adjustment or after completion thereof, relative to the housing or to the other support bearings, for example by gluing, pressing in or the like.
  • the second part which is designed as a support pin, can also be adjusted axially relative to the insertion sleeve after the initial adjustment or fixing of the first part, so that even after the initial adjustment of the signal converter, corrections are still possible, for example, to compensate for the described further mechanical relaxation.
  • the support pin per se only requires very small adjustment paths, since the position errors of the bending element that occur after the initial adjustment are usually only relatively small. Unless additional securing for the adjustable support pin is to be provided relative to the insertion sleeve, the support pin must of course be relatively difficult to move in the insertion sleeve, so that unintentional adjustments are excluded.
  • the support bearing which can be adjusted for adjustment is also designed as an electrical contact for the bending element
  • the adjustable support pin serves directly as a contact pin. This enables a simple configuration of the signal converter, since both the support pin and the contact pin anyway need direct contact with the surface of the piezoelectric bending element or the electrodes attached there.
  • the support pin can be a different embodiment of the invention have threads with a small pitch interacting with the insertion sleeve, which ensures precise adjustability while at the same time making it difficult to adjust easily by dimensioning the interacting threads.
  • the support pin can also have a beveled front end, which rests on a counter bearing projecting eccentrically to the support pin on the bending element. This also results in a simple and precise subsequent adjustability of the support pin relative to the insert sleeve.
  • FIG. 1 shows an axial section through a signal converter designed according to the invention along line II in FIG. 2
  • FIG. 2 shows a cross section along line II-II in Fig. 1
  • Fig. 3 shows an axial section along the line III-III in Fig. 2.
  • 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 transmitter 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 example 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 are piezoelectric Bending element 3 and the associated link spring 7 tightly enclose, 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 essentially on three bearings which are provided at a distance from one another.
  • the one support bearing 14 is formed in the exemplary embodiment from the lower end of a support pin designed at the same time as a contact pin 8. This is inserted with an insertion sleeve 15 into a bore in the plate 11 of the encoder housing 1.
  • the other bearings are designed here as tilting bearings 16, which protrude from the plate 11 into the chamber 2 in the shape 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, has the task of pressing the piezoelectric bending element 3 against the bearings 14 and 16. It engages with a point-shaped support point 17, which is formed by a hemispherical bead, on the piezoelectric bending element 3, u. between in an area lying in the axial direction between the bearings 14 on the one hand and 16 on the other hand. 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 20 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 transmitter 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 fits into a groove 23 in the plate 10, serves the same purpose and also for additional centering of the encoder housing 1 protrudes.
  • 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.
  • the piezoelectric bending element 3 is securely fastened by the link spring 7 in the transmitter housing 1 and is guided precisely. It presses the piezoelectric bending element 3 against the bearings 14 and 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 via the chamber 2 to the exhaust air seat 6 and is thus relieved of pressure. If an electrical voltage is supplied via the contact pins 8 and 9, the piezoelectric bending element bends, whereby it lifts off from the supply air seat 5 and closes off 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 three-point support of the piezoelectric bending element 3 on the plate 11 of the encoder housing 1, or on the bearings 14 and 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 initial adjustment or adjustment is by axial Adjustment of the supply air seat 5 and the exhaust air seat 6 as well as the insertion sleeve 15 together with the support or contact pin 8 is possible, the lower end of which forms the support bearing 14.
  • the insert sleeve 15 is fixed in its position relative to the encoder housing 1, for which purpose the insert sleeve can be glued in the bore, for example.
  • the support or contact pin 8 is here interacting with the insertion sleeve 15 Thread 25 with a small pitch can be adjusted in the axial direction by twisting relative to the insertion sleeve 15, with the result that the support bearing 14 also remains adjustable or readjustable.
  • the support bearing 14 also remains adjustable or readjustable.
  • bearings Apart from the illustrated and discussed arrangement of three bearings, of which the one that also serves for electrical contacting is initially adjustable and subsequently adjustable, of course, several bearings could also be provided, of which in turn several initially adjustable and / or subsequently adjustable - and indeed also independent of the electrical contact - could be.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Measuring Fluid Pressure (AREA)
  • Support Of The Bearing (AREA)
EP19930890039 1992-04-03 1993-03-10 Elektro-pneumatischer Signalwandler Expired - Lifetime EP0565510B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT704/92 1992-04-03
AT70492A AT398331B (de) 1992-04-03 1992-04-03 Elektro-pneumatischer signalwandler

Publications (3)

Publication Number Publication Date
EP0565510A2 EP0565510A2 (de) 1993-10-13
EP0565510A3 EP0565510A3 (enrdf_load_stackoverflow) 1994-12-14
EP0565510B1 true EP0565510B1 (de) 1997-02-26

Family

ID=3497609

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930890039 Expired - Lifetime EP0565510B1 (de) 1992-04-03 1993-03-10 Elektro-pneumatischer Signalwandler

Country Status (6)

Country Link
EP (1) EP0565510B1 (enrdf_load_stackoverflow)
JP (1) JPH0620553A (enrdf_load_stackoverflow)
AT (1) AT398331B (enrdf_load_stackoverflow)
CA (1) CA2093257C (enrdf_load_stackoverflow)
DE (1) DE59305506D1 (enrdf_load_stackoverflow)
ES (1) ES2098021T3 (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007034048B3 (de) * 2007-07-20 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

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5628411A (en) * 1994-12-01 1997-05-13 Sortex Limited Valve devices for use in sorting apparatus ejectors
DE29514495U1 (de) * 1995-09-08 1995-11-02 Bürkert Werke GmbH & Co., 74653 Ingelfingen Ventil mit piezoelektrischer Lamelle
DE29718306U1 (de) 1997-10-15 1998-01-22 Bürkert Werke GmbH & Co., 74653 Ingelfingen Piezoventil
DE19810009C1 (de) * 1998-03-09 1999-07-15 Honeywell Bv Elektrisch betätigbares Kleinventil
GB9922069D0 (en) 1999-09-17 1999-11-17 Technolog Ltd Water distribution pressure control method and apparatus
DE19957953C2 (de) * 1999-12-02 2003-08-28 Festo Ag & Co Verfahren und Vorrichtung zur Herstellung eines Piezoventils
DE19957959C1 (de) * 1999-12-02 2001-01-18 Festo Ag & Co Piezoventil und Verfahren zur Herstellung eines Piezoventils
DE10161888A1 (de) 2001-08-14 2003-02-27 Continental Teves Ag & Co Ohg Piezoelektrisch betätigtes Fluidventil
US20040144696A1 (en) 2003-01-29 2004-07-29 Stewart Mills Valve device for use in sorting apparatus ejectors
JP4555129B2 (ja) * 2005-03-10 2010-09-29 株式会社ダイシン 流路切替ユニット、吸着保持ユニット、気圧作動ユニット及び部品搬送装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT380934B (de) * 1983-01-13 1986-07-25 Enfo Grundlagen Forschungs Ag Elektrisch-pneumatischer signalwandler
AT382431B (de) * 1985-02-08 1987-02-25 Enfo Grundlagen Forschungs Ag Elektrisch-pneumatischer signalwandler
US4629926A (en) * 1985-10-21 1986-12-16 Kiwi Coders Corporation Mounting for piezoelectric bender of fluid control device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
EP0565510A3 (enrdf_load_stackoverflow) 1994-12-14
CA2093257A1 (en) 1993-10-04
ES2098021T3 (es) 1997-04-16
CA2093257C (en) 2002-08-20
AT398331B (de) 1994-11-25
EP0565510A2 (de) 1993-10-13
DE59305506D1 (de) 1997-04-03
JPH0620553A (ja) 1994-01-28
ATA70492A (de) 1993-03-15

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