EP0067934B1 - Druckluftspareinrichtung - Google Patents

Druckluftspareinrichtung Download PDF

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Publication number
EP0067934B1
EP0067934B1 EP82103026A EP82103026A EP0067934B1 EP 0067934 B1 EP0067934 B1 EP 0067934B1 EP 82103026 A EP82103026 A EP 82103026A EP 82103026 A EP82103026 A EP 82103026A EP 0067934 B1 EP0067934 B1 EP 0067934B1
Authority
EP
European Patent Office
Prior art keywords
valve
pressure reducing
fluid
annular
seat
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
EP82103026A
Other languages
English (en)
French (fr)
Other versions
EP0067934A2 (de
EP0067934A3 (en
Inventor
Migliori Luciano
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.)
UNIVER Srl
Original Assignee
UNIVER Srl
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 UNIVER Srl filed Critical UNIVER Srl
Publication of EP0067934A2 publication Critical patent/EP0067934A2/de
Publication of EP0067934A3 publication Critical patent/EP0067934A3/en
Application granted granted Critical
Publication of EP0067934B1 publication Critical patent/EP0067934B1/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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
    • F15B11/064—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam with devices for saving the compressible medium
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50554—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure downstream of the pressure control means, e.g. pressure reducing valve

Definitions

  • This invention concerns a device for economizing on compressed air or other similar fluid used for controlling pneumatic cylinders of machine-tools or machines in general.
  • a compressed-air economizing device foresees the use of a pressure reducing valve or reducer in a feeding duct of the pneumatic cylinder, parallel to which is a one-way valve to allow the flow of the compressed air in the opposite direction to that of the pressure reducing valve.
  • the devices known to date present a very complicated structure and consist substantially in placing a one-way valve at the side of a pressure reducing valve.
  • the device consequently proves to be cumbersome in size and expensive in manufacture insofar as it calls for various machining operations in order to form the passages for the fluid and the seats of the two valves within the same body.
  • This invention aims to remedy these problems by providing a compressed-air enconomizing device, structured in such a way as to substantially simplify its construction and to make it possible to substantially reduce its overall diamensions.
  • This aim is achieved by a device according to claim 1.
  • the invention makes it possible moreover to optionally abolish the use of any springs whatsoever in the air flow passage thereby enabling the device itself to last longer and to function better.
  • this shows an example of application of a compressed-air economizing device 5 for controlling a penumatic cylinder 1, the working stroke of which must be carried out with a first value of thrust power, by feeding for example compressed air at a pressure of approximately 5 or 6 Atm., whereas the return stroke can be carried out with a much lower value of power, for example with compressed air at a pressure of approximately 2 Atm., sufficient to overcome the friction in the system.
  • the chamber of the cylinder 1, on the opposite side to that of the rod 2, is connected directly to a source 3 of compressed air, through a distributor 4, whereas on the rod side it is connected to the aforementioned source, by means of an economizing device 5 in order to avoid a pointless waste of compressed air, at high pressure, just for the return stroke of the cylinder 1.
  • the pressure economizing device 5, in the diagram of figure 1, is schematically represented with the pressure reducer 6 inserted into a main passage for feeding the fluid under pressure to the cylinder 1, parallel to which is a one-way valve 7 for allowing the fluid to flow from the cylinder 1 towards an outlet, that is to say, in the opposite direction to that mentioned previously, during the working stroke of the cylinder.
  • FIG. 2 of the accompanying drawing shows a first embodiment of compressed-air economizing device, according to this invention.
  • Such device comprises a body 8 conventionally defining an inlet 9 and an outlet 10 for the fluid. Between the inlet 9 and the outlet 10 the body is provided with a cavity 11 defining a pressure reducing chamber, into which is inserted, for example, screwed in, the body 12 of an automatic pressure reducing valve, described hereunder.
  • the pressure reducing valve body 12 comprises a sleeve or cylindrical baffle 13 which extends axially into the chamber starting from the body 12 of the valve; the sleeve 13 thus defines an internal rectilinear section 14, of the main passage for the fluid, between the inlet 9 and the outlet 10.
  • a small piston 15 biased by a spring 16 the tension of which can be adjusted by acting upon a knob 17 in order to set the degree of reduction in the pressure.
  • the piston 15 extends towards the chamber 11 by means of a stem 18 onto which is screwed or fixed a closure member 19 which is movable towards a valve seat 20 situated on the inner end of the baffle or sleeve 13, as shown.
  • the section 14 of the main passage of the fluid, defined within the sleeve 13, communicates directly, on one side, with the pressure reducing chamber 11, which, in turn, opens towards the outlet 10, whereas on the other side it communicates, by means of secondary passage, for example, by means of radial apertures 21 formed in the wall of the sleeve 13 situated above a one-way valve, described further on, with an annular chamber 22 which coaxially encircles the sleeve 13 and which opens towards the inlet 9.
  • annular chamber 22 is in direct communication with the inlet 9, however said annular chamber is also in communication with the fluid outlet 10, for example, through the pressure reducing chamber 11 itself, thus defining a branched out passage comprising a one-way valve operating in the previously described manner.
  • a one-way valve comprises an annular seat formed by a first circular ledge 23, on the outermost edge of the cylindrical sleeve 13, and by a second circular ledge 24 within the body 8 of the device; the two ledges 23 and 24 are radially separated from each other so as to create an annular passage for the fluid.
  • the one-way valve is completed, in the example shown in figure 2, by an annular closure member 25, movable within the annular chamber 22; the shutter is made to close, against the seats 23 and 24, by a spring 26 and by the pressure of the fluid itself which is exerted within the chamber 22, during the passage from the inlet 9 to the outlet 10 of the fluid for controlling the working stroke of the cylinder 1.
  • the shutter 19 of the pressure reducing valve 12 is forced to close, against the seat 20, by the pressure of the fluid itself, whilst the one-way valve 23, 24 and 25, overcoming the counter force of the spring 26, is made to open.
  • the concentric arrangement of the pressure- reducing valve and of the one-way valve makes it possible to achieve a device with a compact and highly functional structure, insofar as the dimensions of the various parts and the sectional areas of flow of the fluid can be sized according to the desired capacity, keeping the overall dimensions of the entire device to a minimum.
  • the device may be made from any suitable material, at a very low cost, due to the fact, for example, that the body 8 of the device can now be moulded without calling for special machining.
  • the example in figures 3 and 4 shows an alternative embodiment of the device, aimed at a different embodiment of the single-acting valve; consequently the parts which remain unchanged, with respect to the previous case, bear the same numerical references.
  • the device of figure 3 also comprises a body 8 with an inlet 9 and an outlet 10 for the fluid in the indicated direction and a pressure reducing chamber 11 within which the reducing valve 19, 20 is situated.
  • Reference 13 indicates the cylindrical sleeve, defining the section 14 of the main passage of the fluid and the annular chamber 22, coaxial to the sleeve itself.
  • the reference numbers 23 and 24 still indicate the annular ledges on the sleeve 13 and on the body 8 of the device, defining the annular seat of the one-way valve; unlike the previous example, here the closure-member of the one-way valve is made in such a way as to eliminate the need for any biasing spring whatsoever, due to the fact that any such spring could wear out as a result of its repeated and continuous operation, and due to the fact of being in direct contact with compressed air or a fluid which generally contains corrosive substances which tend to deteriorate the spring itself.
  • the elimination of such spring and its replacement with elastic characteristics of the element itself designed to form a seal makes it possible to substantially improve the device, whilst still maintaining the innovatory features of the previous example.
  • the shutter of the single-acting valve consists of a flexible washer, comprising a circular band 27 which fits tightly into a groove 29 formed on the outside of the cylindrical sleeve 23, from which protrudes, radially, an annular flange 28 connected to the circular band 27, by means of a portion 30 defining a flexible hinge.
  • the flange 28 fits tightly onto the aforementioned annular seats 23 and 24. Therefore, when the upper face of the flange 28, that is to say, that facing the annular chamber 22, is subjected to a greater pressure than that exerted upon the other face, the washer is pushed tightly against the seat 24, thereby closing the one-way valve.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lift Valve (AREA)

Claims (6)

1. Eine Druckluftspareinrichtung, bestehend aus einem Körper (8), der einen ersten Hauptdurchgang von einer Einlassöffnung (9) zu einer Auslassöffnung (10) für das unter Druck stehende Fluidum bildet, in welchem sich ein Druckreduzierventil (6) befindet, und mit einem zweiten, parallel zum ersten verlaufenden Durchgang versehen ist, in dem ein Einwegventil (7) installiert ist, das den Fluss des Fluidums in entgegengesetzter Richtung zum obigen Reduzierventil (6) ermöglicht, gekennzeichnet dadurch, dass der Körper (8) der Einrichtung eine Verteifung aufweist, in der sich ein Zylinderarm (13) befindet, der eine einere Sektion (14) des Hauptdurchgangs des Fluidums abgrenzt, die mit dem Sitz (20) des Druckreduzierventils gebildet wird; diese durch den Zylinderarm (13) abgegrenzte Sektion (14) des Hauptdurchgangs steht auf einer Seite über Sekundärdurchgänge (21) mit einer Ringkammer (22) in Verbindung, die den obigen Arm (13) umgibt und sich in Richtung der Fluidums-Einlassöffnung (9) öffnet, während die erwähnte Sektion (14) des Durchgangs auf der anderen Seite über das Druckreduzierventil (7, 19, 20) mit einer Druckreduzierkammer (11) in Verbindung steht, die sich in Richtung der Fluidums-Auslassöffnung (10) öffnet, wobei die oben erwähnte Ringkammer (22) ausserdem über einen Abzweigdurchgang mit einem Einwegeventil, das durch einen Ringsitz (23, 24), der konzentrisch zum Sitz (20) des Druckreduzierventils angeordnet ist, und durch einen Dichtungsring (25, 28) innerhalb der Ringkammer (22) gebildet wird, und gegen den obigen Sitz (23, 24) durch den Eigendruck des Fluidums geöffnet und geschlossen wird, mit obiger Auslassöffnung (10) verbunden ist.
2. Eine Einrichtung gemäss Anspruch 1, gekennzeichnet dadurch, dass das obige Dichtungselement (25, 28) des Einwegventils aus einem ringförmigen Verschlussglied (25) besteht, das axial innerhalb der Ringkammer (22) verschiebbar ist und gegen den Ringstiz (23, 24) des Ventils gedrückt wird.
3. Eine Einrichtung gemäss Anspruch 1, gekennzeichnet dadurch, dass das obige Dichtungselement des Einwegventils aus einer Dichtung mit einem elastisch biegbaren Flanschstück (28) besteht, das den Ventilsitz (23, 24) abdichtet.
4. Eine Einrichtung gemäss Anspruch 3, gekennzeichnet dadurch, dass obige Dichtung radial an einem runden Band (27) befestigt ist, das sich in einer Vertiefung (29) befindet, die in die Aussenfläche des Zylinderarms (13) eingearbeitet ist.
5. Eine Einrichtung gemäss Anspruch 1, gekennzeichnet dadurch, dass die Sekundädurchgänge (21) die Form radialer Öffnungen im Zylinderarm (13) haben, die sich über dem Sitz (23, 24) des Einwegventils befinden.
6. Eine Einrichtung gemäss den vorangegangenen Ansprüchen, gekennzeichnet dadurch, dass sich das Druckreduzierventil und das Einwegventil in einem einheitlichen Ventilkörper (12) befinden, der in die Vertiefung in der Druckreduzierkammer (11) eingeschraubt wird, welche sich im Körper (8) der Spareinrichtung befindet.
EP82103026A 1981-04-29 1982-04-08 Druckluftspareinrichtung Expired EP0067934B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT21438/81A IT1139088B (it) 1981-04-29 1981-04-29 Dispositivo economizzatore di aria compressa,comprendente una valvola unidirezionale coassiale ad una valvola riduttrice di pressione
IT2143881 1981-04-29

Publications (3)

Publication Number Publication Date
EP0067934A2 EP0067934A2 (de) 1982-12-29
EP0067934A3 EP0067934A3 (en) 1983-01-12
EP0067934B1 true EP0067934B1 (de) 1985-01-16

Family

ID=11181788

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82103026A Expired EP0067934B1 (de) 1981-04-29 1982-04-08 Druckluftspareinrichtung

Country Status (3)

Country Link
EP (1) EP0067934B1 (de)
DE (1) DE3261914D1 (de)
IT (1) IT1139088B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102635587A (zh) * 2012-04-28 2012-08-15 汕头市甜甜乐糖果食品有限公司 气缸供气控制结构

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3311816C1 (de) * 1983-03-31 1984-07-05 Graubremse Gmbh, 6900 Heidelberg Druckbegrenzungsventil fuer Druckluftbremsanlagen von Kraftfahrzeugen
AT386258B (de) * 1985-03-15 1988-07-25 Hoerbiger Ventilwerke Ag Steuerungsanordnung fuer pneumatische arbeitszylinder
DE4040214A1 (de) * 1990-12-15 1992-06-17 Gisag Ag Giesserei Masch Drucklufteinlass- und auspuffventilanordnung fuer formmaschinen, insbesondere kernschiessmaschinen
DE112015006510A5 (de) * 2015-06-15 2018-03-15 Festo Ag & Co. Kg Antriebssystem und Verfahren zum Betreiben eines fluidbetätigten Drehantriebs

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1650440B2 (de) * 1967-09-26 1973-11-22 Knorr-Bremse Gmbh, 8000 Muenchen Drosselruckschlagventil
US3643684A (en) * 1970-03-16 1972-02-22 William L Moore Pressure control devices for pneumatic circuits
FR2343280A1 (fr) * 1976-03-05 1977-09-30 Bouteille Daniel Limiteur de debit unidirectionnel
US4175473A (en) * 1976-06-08 1979-11-27 Shoketsu Kinzoku Kogyo Kabushiki Kaisha Fluid circuit
FR2482212A1 (fr) * 1980-04-23 1981-11-13 Bouteille Daniel Dispositif economiseur de gaz comprime
FR2481403A1 (fr) * 1980-04-23 1981-10-30 Bouteille Daniel Dispositif economiseur d'air comprime

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102635587A (zh) * 2012-04-28 2012-08-15 汕头市甜甜乐糖果食品有限公司 气缸供气控制结构

Also Published As

Publication number Publication date
DE3261914D1 (en) 1985-02-28
EP0067934A2 (de) 1982-12-29
IT8121438A0 (it) 1981-04-29
EP0067934A3 (en) 1983-01-12
IT1139088B (it) 1986-09-17

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