EP0165282B1 - pneumatischer fühler für pneumatische steuerungen - Google Patents

pneumatischer fühler für pneumatische steuerungen Download PDF

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Publication number
EP0165282B1
EP0165282B1 EP85900131A EP85900131A EP0165282B1 EP 0165282 B1 EP0165282 B1 EP 0165282B1 EP 85900131 A EP85900131 A EP 85900131A EP 85900131 A EP85900131 A EP 85900131A EP 0165282 B1 EP0165282 B1 EP 0165282B1
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EP
European Patent Office
Prior art keywords
pneumatic
valve
compressed air
orifice
control signal
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
EP85900131A
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English (en)
French (fr)
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EP0165282A1 (de
Inventor
André Legris
Yves Levenez
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Legris SA
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Legris SA
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Publication date
Application filed by Legris SA filed Critical Legris SA
Publication of EP0165282A1 publication Critical patent/EP0165282A1/de
Application granted granted Critical
Publication of EP0165282B1 publication Critical patent/EP0165282B1/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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2278—Pressure modulating relays or followers

Definitions

  • the present invention relates to a pneumatic sensor for controlling pneumatic cycles.
  • Pneumatic sensors which are the subject in particular of GB-A 1 428 887 in which a vacuum pump is used supplied at the inlet by a compressed air circuit and connected at the outlet to a leakage nozzle, the obturation causes a rise in pressure in the tube which is transmitted to a pneumatic relay capable of transmitting a pneumatic signal.
  • the space between the nozzles of the proboscis is connected to an outlet opening emitting the control signal.
  • the pneumatic relay is very complex and includes a set of membranes and valves.
  • the space between the nozzles of the proboscis is connected on the other hand to a vent valve which, open during the ejection leak, admits atmospheric pressure in space, l outlet and the conduit supplying the control signal to the pneumatic component, preventing the creation of a vacuum and which is closed during sealing of the leak, the supply pressure discharging and being established in the outlet, the conduit thus forming the pneumatic pressure signal.
  • the device according to the invention therefore makes it possible to replace a relay or a "yes" cell with a valve canceling the vacuum of the vacuum tube and thus allowing in a simple way the use of a tube for the emission of a signal. piloting a pneumatic component.
  • the device is very simple because it allows the use of fittings instead of complex devices with membranes of the seats and multiple valves.
  • the pressure rise and the signal are obtained by closing the leakage circuit which can be a simple orifice but also leakage contactors of all types.
  • the leakage circuit can be integrated into signal limit switch devices, but it can also be controlled electrically or pneumatically.
  • the signal emitted by the sensor can actuate all conventional dispensing devices of all types remotely.
  • the pneumatic signal emitted can be integrated into the device and it can be transformed into an electrical signal.
  • the device allows rapid unstacking by limited suction.
  • FIG. 1 there is shown an embodiment of a pneumatic sensor according to the invention which comprises a body 1 having the shape of a fitting and internally comprising a vacuum pump consisting of a nozzle 2 of small diameter and d a nozzle 3 of larger diameter than the nozzle 2, a space 4 being provided between the two nozzles.
  • the nozzle 2 opens into a threaded pipe 5 which is connected by a conduit 6 to a source of pressurized fluid 7 or to the fluid escaping from the jack via a distributor 8 supplying a jack 9 comprising a piston 9a.
  • the nozzle 3 opens into a threaded tube 10 which is connected by a conduit to a leakage nozzle 11 from which an air jet escapes and which can be closed by a closure member 12 mounted at the end of the rod 9b of the jack 9.
  • the space 4 located between the nozzles of the proboscis is connected on the one hand to a valve seat 13 having orifices 13 !!, capable of being closed by a thin elastic washer 13b forming one-way valve and on the other hand it opens into a threaded pipe 14 for outputting a control signal itself connected by a conduit 15 to a member to be controlled, in particular a distributor 16.
  • the pressure propagates in the conduit 15 giving a pressure signal which controls the distributor 16 whose drawer changes position.
  • the horn 2, 3 is again supplied with the air escaping from the jack towards the atmosphere; the vacuum pump accelerates the removal of the valve 16 until the pressure equals atmospheric pressure, the valve 13b being automatically on the atmosphere at the slightest depression. De-piloting is therefore much faster than by natural emptying.
  • the circuit 15 very quickly regains substantially the atmospheric pressure.
  • FIG. 2 there is shown an alternative embodiment of a sensor in which a signal amplification means allows the simultaneous and rapid control of several distributors.
  • This signal amplification means comprises a channel 18 connected on one side with the supply inlet pipe 5 and on the other side with a chamber 19 connected by a channel 20 to the pipe 24 of the output signal .
  • the orifice of the channel 18 is closed by the central part of a membrane 21 or of a piston subjected to the action of a spring 22 bearing against a valve body 23.
  • a membrane 21 or of a piston subjected to the action of a spring 22 bearing against a valve body 23.
  • the nozzle is closed off 11 fluid leakage pressure in the sensor, acting on the entire membrane 21 opens the channel 18 releasing a large amount of fluid from the compressed air inlet to the pilot outlet 14 through the chamber 19 and the channel 20 which is connected to it.
  • FIG 3 there is shown a connector-shaped sensor in which the body 24 which comprises a passage conduit 25 whose inlet 5 is connected to the source of pressurized fluid 7 by the distributor 8, said conduit 25 being connected to the horn 2, 3 and having an outlet for pressurized fluid which is connected by a conduit 26 to one of the chambers of the jack 9.
  • the pipe 4 emitting the control signal is connected by a conduit 27 to the inlet of the actuator control means 8.
  • FIG 4 there is shown a sensor which consists of a banjo connector 31 and a screw 28 mounted directly in a threaded hole 29 of an apparatus 30 which supplies the relay and the cylinder with compressed fluid.
  • the banjo 31 sensor is surmounted by a simple banjo 32.
  • the direct supply circuit passes through 32 and the sensor 31 is supplied with bypass.
  • the screw 28 is mounted on the distributor 8, and the body 31 has a tube 10 connected to the leakage nozzle 11 and a tube 14 for signal output connected to the command input the distributor 8 through the conduit 27.
  • the other body 32 connects the inlet for pressurized fluid through a tube 33, to the conduit 26 for supplying one of the chambers of the jack 9.
  • the screw 28 is mounted on the cylinder body, the body 31, being connected by its tubing 10 to the fluid nozzle 11, and the tubing 14 for output of the control signal to the distributor 8 by a conduit 27.
  • the other body 32 is connected by a conduit 26 to the distributor 8.
  • FIG 7 there is shown a T-shaped connector body which is similar to that of Figure 1, but in which the nozzles 2 and 3 of the proboscis are produced directly in the body and said body 1 of the sensor is associated to a fitting 34 in T to ensure the control of the functioning of the jack 9 (fig. 8).
  • FIG. 9 there is shown an embodiment of a leakage nozzle 11 which is formed in a plate 35 of an apparatus and which is connected by a conduit 36 to the pipe 10 of the relay.
  • a member 37 linked to a control means and which is capable of closing the orifice of the leakage nozzle 11 according to a known method but in the associated invention for interrupting the leak.
  • 10a there is shown a leakage nozzle 11 which is closed by a valve 37 subjected to the action of springs and comprising a ball 38 which cooperates with a movable member 39 integral in particular with an actuator rod according to a method known, but in the invention associated with it for the interruption of the leak.
  • FIGS 11, 11a there is shown a means for closing the leakage nozzle which is integrated into the body of the sensor.
  • the leakage nozzle 11 has its opening controlled by a valve 40 controlled by a lever 42 against the action of a spring 41, said lever 42 being articulated around an axis 43 on the body 1 of the sensor and carrying at its other end a roller 44, cooperating with a movable member 45 in the form of a cam, in order to open and close the orifice of the nozzle 11.
  • FIGS 12 and 1 2a there is shown a sensor which is integrated at the end of the body 46 of any device, said body 46 being located opposite a shutter member 47 which by sliding on the latter closes the 'leakage nozzle 11.
  • a dispenser comprising a body 48 in which is mounted slide und drawer 49 and which comprises at its two ends of the sensors controlling the movement of the drawer.
  • the conduits 14 delivering a control signal when the leakage nozzles 11 are closed, opens opposite the ends of the drawer 49 in order to move the latter to the right or to the left.
  • the orifices the sensors are connected by conduits 50, 50a to the fluid inlet orifice in the body 48 of the distributor.
  • the leakage circuit can be closed all along the circuit 11.
  • a “manual” control can be installed on the circuit 11 in addition to the leakage circuit. Manual control closing the circuit.
  • the pneumatic signal is transmitted through line 14 to the distributor.
  • FIG 14 there is shown a sensor mounted at one end of the distributor as in Figure 13, however the opening and closing of the leakage nozzle 11 are controlled by a valve 51 which is actuated magnetic metal in the closing direction by an electromagnet 52 connected to an electrical circuit.
  • manual control of the signal can easily be obtained by closing the leak with your finger; one can also push the valve 51 on its seat to close the leak.
  • the valve 51 can also be equipped with a push button to facilitate finger operation. Leakage protection can also be provided to avoid inadvertent manual operations.
  • FIG 15 there is shown a sensor whose body 1 is capable of being connected to a fluid inlet conduit by its threaded pipes 5, 5a.
  • the leakage nozzle 11 is controlled by a valve 51 actuated in the closing direction by an electromagnet 52.
  • the pneumatic signal leaves through the pipe 14.
  • FIG 16 there is shown a sensor whose body 1 receives an enclosure 53 in which is disposed a contactor 54 whose control member 55 is supported against a deformable membrane 56 closing a chamber 57 into which opens a conduit 14 emitting a pressure signal when closing the nozzle 11.
  • FIGS. 15 and 16 constitute what are currently called electro-pneumatic interfaces, transforming thanks to the invention the pneumatic signal into an electrical signal and vice versa.
  • the invention finds its field in the control of cycles of pneumatic cylinders, and in the pneumatic control of machine cycles.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measuring Fluid Pressure (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Examining Or Testing Airtightness (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)

Claims (9)

1. Pneumatischer Fühler für die Steuerung pneumatischer Zyklen, worin eine Evakuier-Strahlpumpe (2, 3, 4) am Eingang (5) aus einem Druckluftkreis gespeist wird und am Ausgang (10) an eine Leckströmungsdüse (11) angeschlossen ist, deren Verschliessen einen Druckanstieg in der Strahlpumpe hervorruft, weicher als Steuersignal für ein pneumatisches Bauteil (16) verwendet wird, wobei der Raum (4) zwischen den Spritzdüsen (2, 3) der Strahlpumpe einerseits angeschlossen ist an eine Auslassöffnung (14), welche das Steuersignal abgibt, dadurch gekennzeichnet, dass der Raum (4) andererseits angeschlossen ist an ein Ventil (13b) zum Öffnen an die freie Luft, welches im offenen Zustand während des Ausspritzens der Leckströmung Atmosphärendruck in den Raum (4), die Austrittsöffnung (14) und die Leitung (15), welche das Steuersignal dem pneumatischen Bauteil (16) zuführt, eintreten lässt, wobei die Erzeugung eines Unterdrucks verhindert wird, und welches während der Absperrung der Leckströmung geschlossen ist, wobei der Speisedruck gestaut wird und sich in der Auslassöffnung (14) und der Leitung (15) aufbaut, um so das pneumatische Drucksignal zu bilden.
2. Fühler nach Anspruch 1, dadurch gekennzeichnet, dass der Fühler gebildet ist aus einem Körper (1), welcher drei Anschlussöffnungen (5, 10, 14) aufweist, die mit dem Drucklufteinlass bzw. der Leckströmungsdüse (11) bzw. mit der Auslassleitung (15) verbunden sind, welche das Steuersignal ausgibt, wobei der genannte Körper die zwei Spritzdüsen (2, 3) der Evakuier-Strahlpumpe umfasst, zwischen weichen ein Raum (4) vorgesehen ist, der auf einer Seite mit einer Öffnung verbunden ist, worin das Ventil (13b) angeordnet ist, und auf der anderen Seite mit der Öffnung (14), welche das Steuersignal abgibt.
3. Fühler nach Anspruch 2, dadurch gekennzeichnet, dass in dem Körper (1) ein Steuersignal-Durchsatz-Verstärker angebracht ist, welcher aus einem Ventil (21, 22, 23) mit einer Membran (21) oder einem Kolben gebildet ist, wodurch eine Zweigleitung (18, 21) verschlossen wird, die auf einer Seite an der Drucklufteinlassöffnung (5) mündet und an der anderen Seite an der Steuersignalöffnung (14) mündet.
4. Fühler nach Anspruch 2, dadurch gekennzeichnet, dass der Körper (1) eine Druckluft-Durchgangsleitung (25) umfasst, deren eines Ende an einen Verteiler (8) angeschlossen ist und deren anderes Ende mit einer der Kammern eines Arbeitszylinders (9) verbunden ist, wobei die genannte Leitung in ihrem mittleren Teil an die Spritzdüsen (2, 3) der Strahlpumpe angeschlossen ist.
5. Fühler nach Anspruch 2, dadurch gekennzeichnet, dass der Körper (1) aus einem doppelten Banjo-Anschluss gebildet ist, dessen Schraube (28) an dem Benutzergerät befestigt und an den Druckluftanschluss angeschlossen ist, wobei einer der Körper (31) des Banjos die Evakuier-Strahlpumpe (2, 3, 4) und das Ventil (1 3b) zum Öffnen an die freie Luft umschliesst sowie eine Drucklufteinlassöffnung, eine Steuersignalauslassöffnung und eine Öffnung aufweist, welche an die Leckströmungsdüse angeschlossen ist, wobei der andere Körper (32) an einen Drucklufteinlass und -auslass angeschlossen ist, weicher ein anderes Gerät speist.
6. Fühler nach Anspruch 2, dadurch gekennzeichnet, dass an dem Körper (1) des Fühlers ein Ventil (40) angebracht ist, weiches die Öffnung der Leckströmungsdüse (11) steuert, wobei dieses Ventil (40) durch einen Hebel (42) gesteuert wird, der (bei 43) an dem Körper (1) angelenkt ist und an einem seiner Enden eine Rolle (44) aufweist, die mit einem beweglichen Organ (45) zusammenwirkt.
7. Fühler nach Anspruch, dadurch gekennzeichnet, dass die Körper (1) von zwei Fühlern an den beiden Enden des Körpers (48) des Verteilers integriert sind und die Drucklufteinlassöffnungen über eine Leitung (50) mit dem Drucklufteinlass der Verteilers (48, 49) verbunden sind, wobei die Öffnungen (14), welche die Ausgangssignale abgeben, an jedem Ende des Verteilerschiebers (49) ausmünden.
8. Fühler nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass das Verschliessen der Öffnung der Leckströmungsdüse (11) durch ein Ventil (51) gesteuert wird, welches durch eine elektrische, pneumatische oder manuelle Einrichtung (52) gesteuert wird.
9. Fühler nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass das pneumatische Steuersignal auf eine Einrichtung (53, 55, 56) einwirkt, welche das pneumatische Signal in ein elektrisches Signal umsetzt.
EP85900131A 1983-12-09 1984-12-04 pneumatischer fühler für pneumatische steuerungen Expired EP0165282B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8319798A FR2556420B1 (fr) 1983-12-09 1983-12-09 Perfectionnement aux capteurs pneumatiques pour la commande de cycles pneumatiques
FR8319798 1983-12-09

Publications (2)

Publication Number Publication Date
EP0165282A1 EP0165282A1 (de) 1985-12-27
EP0165282B1 true EP0165282B1 (de) 1987-09-16

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ID=9295056

Family Applications (1)

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EP85900131A Expired EP0165282B1 (de) 1983-12-09 1984-12-04 pneumatischer fühler für pneumatische steuerungen

Country Status (8)

Country Link
US (1) US4658849A (de)
EP (1) EP0165282B1 (de)
JP (1) JPS61500625A (de)
DE (1) DE3466271D1 (de)
ES (1) ES8604340A1 (de)
FR (1) FR2556420B1 (de)
IT (2) IT8454132V0 (de)
WO (1) WO1985002659A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1516690A (fr) * 1966-04-04 1968-03-08 Perfectionnements apportés aux dispositifs de commande pneumatiques
US3378022A (en) * 1964-04-06 1968-04-16 Johnson Service Co Fluid flow sensing system
CH547958A (de) * 1972-09-15 1974-04-11 Bircher Max Pneumatischer impulsverstaerker.
GB1428887A (en) * 1973-06-18 1976-03-17 Gnii Teploenetgeticheskogo Pri Pneumatic transducer for converting mechanical displacement of responsive element into pneumatic signal

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3699991A (en) * 1970-08-28 1972-10-24 Johnson Service Co Supply connection means for bleed type sensing apparatus
US3812873A (en) * 1971-11-18 1974-05-28 Johnson Service Co Fluid signal limiting device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3378022A (en) * 1964-04-06 1968-04-16 Johnson Service Co Fluid flow sensing system
FR1516690A (fr) * 1966-04-04 1968-03-08 Perfectionnements apportés aux dispositifs de commande pneumatiques
CH547958A (de) * 1972-09-15 1974-04-11 Bircher Max Pneumatischer impulsverstaerker.
GB1428887A (en) * 1973-06-18 1976-03-17 Gnii Teploenetgeticheskogo Pri Pneumatic transducer for converting mechanical displacement of responsive element into pneumatic signal

Also Published As

Publication number Publication date
IT8454132V0 (it) 1984-12-07
ES8604340A1 (es) 1986-01-16
FR2556420B1 (fr) 1986-07-25
WO1985002659A1 (fr) 1985-06-20
ES538421A0 (es) 1986-01-16
IT8468218A0 (it) 1984-12-07
US4658849A (en) 1987-04-21
JPS61500625A (ja) 1986-04-03
EP0165282A1 (de) 1985-12-27
IT1179850B (it) 1987-09-16
DE3466271D1 (en) 1987-10-22
IT8468218A1 (it) 1986-06-07
FR2556420A1 (fr) 1985-06-14

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