EP0091994B1 - Apparatus for generating gas under pressure - Google Patents

Apparatus for generating gas under pressure Download PDF

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Publication number
EP0091994B1
EP0091994B1 EP82111467A EP82111467A EP0091994B1 EP 0091994 B1 EP0091994 B1 EP 0091994B1 EP 82111467 A EP82111467 A EP 82111467A EP 82111467 A EP82111467 A EP 82111467A EP 0091994 B1 EP0091994 B1 EP 0091994B1
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EP
European Patent Office
Prior art keywords
valve
idle
pressure
suction
compressor
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
EP82111467A
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German (de)
French (fr)
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EP0091994A1 (en
Inventor
Werner Heger
Hans-Dieter Gelse
Manfred Kramer
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.)
Wabco Vermogensverwaltung GmbH
Original Assignee
Wabco Vermogensverwaltung GmbH
Wabco Westinghouse Fahrzeugbremsen GmbH
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Application filed by Wabco Vermogensverwaltung GmbH, Wabco Westinghouse Fahrzeugbremsen GmbH filed Critical Wabco Vermogensverwaltung GmbH
Priority to AT82111467T priority Critical patent/ATE25749T1/en
Publication of EP0091994A1 publication Critical patent/EP0091994A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/24—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F04C28/26—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/24—Bypassing
    • F04B49/243—Bypassing by keeping open the inlet valve

Definitions

  • the invention relates to a device for generating compressed gas, in particular for a compressed air brake system, according to the preamble of claim 1.
  • Such a device is described in connection with a compressed air brake system in the unpublished German patent application DE-A-3136 948.
  • a pressure control device (known under the name “Governor •) that can be acted upon by the pressure of the storage container and the like. a. used to switch the air compressor delivery phase to an idle phase.
  • the pressure control valve device connected between the storage container and the suction part of the compressor switches over when a certain container pressure is exceeded in such a way that compressed air is applied to a switching piston arranged in the cylinder head of the compressor and the stroke movement of the switching piston triggered thereby opens the suction valve of the compressor by means of a piston tappet.
  • suction valves in the advantageous lamella construction is completely problem-free if the compressor is arranged in a device whose pressure control is carried out by means of a valve device in which a pressure exceeding a certain pressure level is blown off into the atmosphere in a known manner, i.e. H. the compressor continues to deliver compressed air in the idling phase so that the suction valve maintains its normal function during this phase.
  • a lamella valve that opens during the suction process of the compressor protrudes with its lamella into the compression chamber and is pressed out of the compression chamber or out of the piston stroke area of the piston onto its valve seat in the closed position during the compression process.
  • the invention is therefore based on the object of creating a device of the type mentioned, in which the suction valve of the compressor can be designed as a lamellar valve despite pressure control by means of a "governor".
  • the use of a lamellar suction valve is advantageously made possible by a connection between the suction chamber and the compression chamber that is created during the idle phase, since the valve lamella can make the same opening and closing movements in the idle phase, like in the funding phase.
  • the degree of filling of the compressor is also improved by the additional valve of the idling valve device.
  • the device for generating compressed air according to FIG. 1 consists of a compressor shown in section, a storage container 8 and a pressure regulating device 9 consisting of a symbolically represented governor.
  • the section of the compressor shows the part a cylinder 16 with a compression chamber 1, a cylinder head 10 with a suction chamber 2 and a pressure chamber 4 and a valve plate 17 arranged between the cylinder 16 and the cylinder head 10.
  • the valve plate 17 carries a lamella suction valve 3 connecting the suction chamber 2 and the compression chamber 1 and a pressure valve connecting the compression chamber 1 and the pressure chamber 4.
  • a compressed air outlet 5 of the cylinder head 10 establishes a connection between the pressure chamber 4 and the reservoir 8 via a line 7.
  • the valve plate 17 carries a further lamella valve connecting the suction chamber 2 and the compression chamber 1, which as an idle valve 12 is part of an idle valve device 11, 12.
  • the position of the idle valve 12 is located outside the cylindrical compression chamber 1 formed by the bore of the cylinder 16, a recess 15 of the cylinder 16 being connected to the compression chamber 1.
  • the idle valve device 11, 12 includes an idle switch piston 11 with a plunger 11a for actuating the idle valve 12 in the same opening direction as the suction valve 3.
  • the idle switch piston 11 can be pressurized with compressed air.
  • the pressure control device 9 can also be integrated in the cylinder head 10.
  • the tension of a spring 11b acts on the idle shift piston 11 in the closing direction of the idle valve 12.
  • the idle valve consists of a poppet valve 18, the plate of which is acted upon in the valve closing direction by the tension of a spring 18a.
  • the components in FIG. 2 that correspond to FIG. 1 are numbered using the same numbers as in FIG. 1.
  • the schematic representation of the component connected to the compressor via the connections has been omitted in both FIG. 2 and FIG. 3.
  • FIG. 3 Another embodiment is shown in FIG. 3, in which the idle valve 19, designed as a lamellar valve, is located in a recess 20 in the valve plate 21 within the cylindrical compression space formed by the bore of the cylinder 21.
  • the suction valve does not appear on this sectional drawing.
  • the numbers of the components known from FIGS. 1 and 2 have been omitted in FIG.
  • the idle valve can be arranged in recesses both in the cylinder housing and in the valve plate carrying the suction and pressure valve.
  • the spring 18a according to FIG. 2 can be advantageous
  • valve 18 is designed so that during the delivery phase of the compressor, the valve 18 does not open or only partially, which can mean an improvement in the life of the valve.
  • the governor After reaching a certain pressure in the reservoir 8 conveyed by the air compressor, the governor, which had previously been in the blocking position, switches over and compressed air flows from the reservoir 8 via line 13 and the inlet 14 to the idle switching piston 11.
  • the stroke movement of the idle triggered thereby -Switching piston 11 pushes the idle valve 12 with the plunger 11 a until the «governor» switches back again when there is a certain pressure drop in the reservoir 8 and the now depressurized idle switch piston 11 with the aid of the tension of the spring 111b returns to its initial position.
  • the idle valve 12 thus relieved likewise returns to its valve closed position during a compression stroke of the compressor piston.
  • an unimpeded air exchange takes place between the compression chamber 1 and the suction chamber 2, i. H. no compressed air is conveyed into the reservoir 8 via the pressure valve 6 and the pressure chamber 4.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Compressor (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)

Abstract

A valve plate, inserted between the cylinder body and head parts of a compressor, holds the usual compression valve, which opens to connect the compression and pressure chambers during the compression stroke of the piston, and the suction valve which opens to connect the suction and compression chambers during the piston intake stroke. A separate plate-type idle valve also within the plate is positioned to open into a recess of the compression chamber so that there is no interference with the movement of the piston. The idle valve is controlled by an idle piston actuated by pressurized air admitted through a pressure regulator which opens when the reservoir pressure exceeds a predetermined level. Opening the idle valve shifts the compressor operation from compression to idle condition by permitting unhindered passage of air between suction and compression chambers.

Description

Die Erfindung betrifft eine Einrichtung zur Erzeugung von Druckgas, insbesondere für eine Druckluft-Bremsanlage, gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a device for generating compressed gas, in particular for a compressed air brake system, according to the preamble of claim 1.

Eine derartige Einrichtung ist im Zusammenhang mit einer Druckluft-Bremsanlage in der nicht vorveröffentlichten deutschen Patentanmeldung DE-A-3136 948 beschrieben. Bei dieser Einrichtung wird eine vom Druck des Vorratsbehälters beaufschlagbare Druckregeleinrichtung (bekannt unter der Bezeichnung « Governor •) u. a. dazu benutzt, um die Förderphase des Luftpressers in eine Leerlaufphase umzuschalten. Die zwischen dem Vorratsbehälter und dem Ansaugteil des Verdichters geschaltete Druckregelventileinrichtung schaltet beim Übersteigen eines bestimmten Behälterdruckes in der Weise um, daß ein im Zylinderkopf des Verdichters angeordneter Schaltkolben mit Druckluft beaufschlagt wird und die dadurch ausgelöste Hubbewegung des Schaltkolbens mittels eines Kolbenstößels das Saugventil des Verdichters aufstößt. Infolge dieser zwischen dem Saugraum und dem Verdichtungsraum des Verdichters geschaffenen Verbindung fördert dieser keine Druckluft in der Leerlaufphase, bis bei einem bestimmten Abfall des Behälterdruckes die Druckregelventileinrichtung zurückschaltet und der Schaltkolben durch Wegfall der Druckluftbeaufschlagung in seine Ausgangsstellung zurückkehrt, so daß das Saugventil in der Förderphase seine normale Funktion wieder ausüben kann.Such a device is described in connection with a compressed air brake system in the unpublished German patent application DE-A-3136 948. In this device, a pressure control device (known under the name “Governor •) that can be acted upon by the pressure of the storage container and the like. a. used to switch the air compressor delivery phase to an idle phase. The pressure control valve device connected between the storage container and the suction part of the compressor switches over when a certain container pressure is exceeded in such a way that compressed air is applied to a switching piston arranged in the cylinder head of the compressor and the stroke movement of the switching piston triggered thereby opens the suction valve of the compressor by means of a piston tappet. As a result of this connection created between the suction chamber and the compression chamber of the compressor, the latter does not convey any compressed air in the idling phase until the pressure control valve device switches back when the container pressure drops and the switching piston returns to its starting position due to the absence of compressed air, so that the suction valve is in the delivery phase can perform normal function again.

Es ist bekannt, daß bei Verdichtern die Verwendung von Lamellenventilen für die Saugventile vorteilhafter ist als die ebenfalls gehandhabte Verwendung von Tellerventilen, da bei gleichem Ventiltotraumvolumen die Lamellenventile einen größeren Einströmquerschnitt freigeben als die Tellerventile. Die Vorteile eines größeren Einströmquerschnittes sind u. a. geringere Ansaugverluste und ein günstiger Liefergrad des Verdichters.It is known that in the case of compressors, the use of lamellar valves for the suction valves is more advantageous than the use of poppet valves, which is also handled, since the lamellar valves release a larger inflow cross section than the poppet valves for the same valve dead volume. The advantages of a larger inflow cross section are u. a. lower suction losses and a cheaper delivery rate of the compressor.

Die Verwendung von Saugventilen in der vorteilhaften Lamellenbauweise ist völlig problemlos, wenn der Verdichter in einer Einrichtung angeordnet ist, deren Druckregelung mittels einer Ventileinrichtung erfolgt, bei welcher in bekannter Weise ein eine bestimmte Druckhöhe übersteigender Druck in die Atmosphäre abgeblasen wird, d. h. der Verdichter fördert in der Leerlaufphase weiterhin Druckluft, so daß das Saugventil seine normale Funktion während dieser Phase beibehält.The use of suction valves in the advantageous lamella construction is completely problem-free if the compressor is arranged in a device whose pressure control is carried out by means of a valve device in which a pressure exceeding a certain pressure level is blown off into the atmosphere in a known manner, i.e. H. the compressor continues to deliver compressed air in the idling phase so that the suction valve maintains its normal function during this phase.

Ein beim Saugvorgang des Verdichters sich öffnendes Lamellenventil ragt mit seiner Lamelle in den Kompressionsraum und wird beim Verdichtungsvorgang wieder aus dem Verdichtungsraum bzw. aus dem Kolbenhubbereich des Kolbens heraus auf seinen Ventilsitz in Schließstellung gedrückt.A lamella valve that opens during the suction process of the compressor protrudes with its lamella into the compression chamber and is pressed out of the compression chamber or out of the piston stroke area of the piston onto its valve seat in the closed position during the compression process.

Bei der normalen Förderphase und bei einer Leerlaufphase des Verdichters, bei welcher der überschüssige Druck in die Atmosphäre entlüftet wird, gibt es hier keine Probleme. Bei einer Druckregelung mittels « Governor • , bei welcher während der Leerlaufphase das Saugventil offengehalten wird, müßten Maßnahmen getroffen werden, die verhindern, daß der sic4 aufwärts bewegende Kolben gegen die in den Verdichtungsraum ragende Ventillamelle stößt, d. h. der Raum oberhalb des Kolbens müßte in dessen oberster Hubstellung eine entsprechende größere Höhe aufweisen. Die Folgen hiervon wären eine erhebliche Verschlechterung des Liefergrades, eine verlängerte Bauweise des Verdichters und längere Auffüllzeiten der Einrichtung. Man nimmt aus diesem Grunde das kleinere Übel in Kauf und legt die Saugventile als Tellerventile aus.There are no problems with the normal delivery phase and when the compressor is idling, in which the excess pressure is vented to the atmosphere. In the case of pressure control by means of a governor, in which the suction valve is kept open during the idling phase, measures would have to be taken to prevent the piston moving upward from striking the valve lamella projecting into the compression space, i. H. the space above the piston should have a correspondingly greater height in its uppermost stroke position. The consequences of this would be a considerable deterioration in the delivery rate, an extended construction of the compressor and longer refilling times for the facility. For this reason, you accept the lesser evil and design the suction valves as poppet valves.

Der Erfindung liegt deshalb die Aufgabe zugrunde, eine Einrichtung der eingangs genannten Art zu schaffen, bei der trotz Druckregelung mittels eines « Governors » das Saugventil des Verdichters als Lamellenventil ausgelegt werden kann.The invention is therefore based on the object of creating a device of the type mentioned, in which the suction valve of the compressor can be designed as a lamellar valve despite pressure control by means of a "governor".

Diese Aufgabe wird durch die im Patentanspruch 1 angegebene Erfindung gelöst.This object is achieved by the invention specified in claim 1.

Bei der erfindungsgemäßen Einrichtung wird in vorteilhafter Weise durch eine während der Leerlaufphase geschaffene Verbindung zwischen dem Saugraum und dem Verdichtungsraum, die außerhalb des Kolbenbereiches liegt, die Verwendung eines Saugventils in Lamellenbauweise ermöglicht, da die Ventillamelle in der Leerlaufphase dieselben Öffnungs- und Schließbewegungen machen kann, wie in der Förderphase. Durch das zusätzliche Ventil der Leerlauf-Ventileinrichtung wird außerdem der Füllungsgrad des Verdichters verbessert.In the device according to the invention, the use of a lamellar suction valve is advantageously made possible by a connection between the suction chamber and the compression chamber that is created during the idle phase, since the valve lamella can make the same opening and closing movements in the idle phase, like in the funding phase. The degree of filling of the compressor is also improved by the additional valve of the idling valve device.

Vorteilhafte Weiterbildungen und Ausgestaltungen der Erfindung sind in den Unteransprüchen zu entnehmen.Advantageous further developments and refinements of the invention can be found in the subclaims.

Die Erfindung wird nachfolgend anhand von Ausführungsbeispielen, die in der Zeichnung dargestellt sind, näher erläutert.The invention is explained in more detail below on the basis of exemplary embodiments which are illustrated in the drawing.

Es zeigen :

  • Figur 1 eine Druckluft-Erzeugeranlage mit Governor-Druckregelung und einer Leerlauf-Ventileinrichtung des Verdichters, dessen Leerlauf- Ventil in einer Ausnehmung des Verdichtungsraumes außerhalb der Zylinderbohrung liegt,
  • Figur 2 eine Teildarstellung eines Verdichters gemäß Fig. 1, jedoch mit einem Leerlauf-Ventil in Tellerbauweise und
  • Figur 3 eine Teildarstellung des Verdichters gemäß Fig. 2, dessen Leerlauf-Ventil jedoch in einer Ausnehmung des Verdichtungsraumes innerhalb der Zylinderbohrung liegt.
Show it :
  • 1 shows a compressed air generator system with governor pressure control and an idle valve device of the compressor, the idle valve of which lies in a recess in the compression space outside the cylinder bore,
  • Figure 2 is a partial view of a compressor according to FIG. 1, but with an idle valve in plate construction and
  • Figure 3 is a partial view of the compressor of FIG. 2, but the idle valve is located in a recess of the compression chamber within the cylinder bore.

Die Einrichtung zur Erzeugung von Druckluft gemäß Fig. 1 besteht aus einem im Schnitt dargestellten Verdichter, einem Vorratsbehälter 8 und einer aus einem symbolisch dargestellten Governor bestehenden Druckregeleinrichtung 9.The device for generating compressed air according to FIG. 1 consists of a compressor shown in section, a storage container 8 and a pressure regulating device 9 consisting of a symbolically represented governor.

Das Schnittbild des Verdichters zeigt den Teil eines Zylinders 16 mit einem Verdichtungsraum 1, einen Zylinderkopf 10 mit einem Saugraum 2 und einem Druckraum 4 und einer zwischen dem Zylinder 16 und dem Zylinderkopf 10 angeordneten Ventilplatte 17. Die Ventilplatte 17 trägt ein den Saugraum 2 und den Verdichtungsraum 1 verbindendes Lamellen-Saugventil 3 sowie ein den Verdichtungsraum 1 und den Druckraum 4 verbindendes Druckventil. Ein Druckluft-Ausgang 5 des Zylinderkopfes 10 stellt eine Verbindung zwischen dem Druckraum 4 und dem Vorratsbehälter 8 über eine Leitung 7 her.The section of the compressor shows the part a cylinder 16 with a compression chamber 1, a cylinder head 10 with a suction chamber 2 and a pressure chamber 4 and a valve plate 17 arranged between the cylinder 16 and the cylinder head 10. The valve plate 17 carries a lamella suction valve 3 connecting the suction chamber 2 and the compression chamber 1 and a pressure valve connecting the compression chamber 1 and the pressure chamber 4. A compressed air outlet 5 of the cylinder head 10 establishes a connection between the pressure chamber 4 and the reservoir 8 via a line 7.

Die Ventilplatte 17 trägt ein weiteres den Saugraum 2 und den Verdichtungsraum 1 verbindendes Lamellen-Ventil, welches als Leerlauf- Ventil 12 Teil einer Leerlauf-Ventileinrichtung 11, 12 ist. Die Lage des Leerlauf-Ventils 12 befindet sich außerhalb des von der Bohrung des Zylinders 16 gebildeten zylindrischen Verdichtungsraumes 1, wobei eine Ausnehmung 15 des Zylinders 16 mit dem Verdichtungsraum 1 verbunden ist. Zu der Leerlauf-Ventileinrichtung 11, 12 gehört ein Leerlauf-Schaltkolben 11 mit einem Stößel 11a zur Betätigung des Leerlauf-Ventils 12 in derselben Öffnungsrichtung wie das Saugventil 3. Der Leerlauf-Schaltkolben 11 ist mit Druckluft beaufschlagbar. Zu diesem Zweck besteht eine Verbindung mit der vom Vorratsbehälterdruck gesteuerten Druckregeleinrichtung 9 über eine Leitung 13 und einen Druckluft-Eingang 14 des Zylinderkopfes 10. Die Druckregeleinrichtung 9 kann auch in dem Zylinderkopf 10 integriert sein. Die Spannung einer Feder 11b beaufschlagt den Leerlauf-Schaltkolben 11 in Schließrichtung des Leerlauf-Ventils 12.The valve plate 17 carries a further lamella valve connecting the suction chamber 2 and the compression chamber 1, which as an idle valve 12 is part of an idle valve device 11, 12. The position of the idle valve 12 is located outside the cylindrical compression chamber 1 formed by the bore of the cylinder 16, a recess 15 of the cylinder 16 being connected to the compression chamber 1. The idle valve device 11, 12 includes an idle switch piston 11 with a plunger 11a for actuating the idle valve 12 in the same opening direction as the suction valve 3. The idle switch piston 11 can be pressurized with compressed air. For this purpose, there is a connection to the pressure control device 9 controlled by the reservoir pressure via a line 13 and a compressed air inlet 14 of the cylinder head 10. The pressure control device 9 can also be integrated in the cylinder head 10. The tension of a spring 11b acts on the idle shift piston 11 in the closing direction of the idle valve 12.

Gemäß Fig. 2 besteht das Leerlauf-Ventil aus einem Tellerventil 18, dessen Teller in Ventilschließrichtung durch die Spannung einer Feder 18a beaufschlagt wird. Die Bezifferung der mit Fig. 1 übereinstimmenden Bauteile in Fig. 2 erfolgt mit denselben Zahlen wie in Fig. 1. Auf die schematische Darstellung des mit dem Verdichter über die Anschlüsse verbundenen Bauelementes wurde sowohl in Fig. 2 als auch in Fig. 3 verzichtet.2, the idle valve consists of a poppet valve 18, the plate of which is acted upon in the valve closing direction by the tension of a spring 18a. The components in FIG. 2 that correspond to FIG. 1 are numbered using the same numbers as in FIG. 1. The schematic representation of the component connected to the compressor via the connections has been omitted in both FIG. 2 and FIG. 3.

Ein weiteres Ausführungsbeispiel zeigt die Fig. 3, bei welcher sich das Leerlauf-Ventil 19 als Lamellenventil ausgebildet in einer Ausnehmung 20 der Ventilplatte 21 innerhalb des von der Bohrung des Zylinders 21 gebildeten zylindrischen Verdichtungsraumes befindet. Das Saugventil erscheint auf dieser Schnittzeichnung nicht. Auf die Bezifferung der aus Fig.1 und 2 bekannten Bauteile wurde in Fig. verzichtet.Another embodiment is shown in FIG. 3, in which the idle valve 19, designed as a lamellar valve, is located in a recess 20 in the valve plate 21 within the cylindrical compression space formed by the bore of the cylinder 21. The suction valve does not appear on this sectional drawing. The numbers of the components known from FIGS. 1 and 2 have been omitted in FIG.

Das Leerlaufventil kann in Ausnehmungen sowohl im Zylindergehäuse als auch in der das Saug- und Druckventil tragenden Ventilplatte angeordnet sein. Die Feder 18a gemäß Fig. 2 kann in vorteilhafterThe idle valve can be arranged in recesses both in the cylinder housing and in the valve plate carrying the suction and pressure valve. The spring 18a according to FIG. 2 can be advantageous

Weise derart ausgelegt werden, daß während der Förderphase des Verdichters das Ventil 18 nicht oder nur teilweise öffnet, was eine Verbesserung der Lebensdauer des Ventils bedeuten kann.Are designed so that during the delivery phase of the compressor, the valve 18 does not open or only partially, which can mean an improvement in the life of the valve.

Nachfolgend wird anhand der Fig. 1 die Funktion kurz beschrieben. Dabei wird die Funktion eines Verdichters als bekannt vorausgesetzt.The function is briefly described below with reference to FIG. 1. The function of a compressor is assumed to be known.

Nach Erreichen eines bestimmten vom Luftpresser geförderten Druckes in dem Vorratsbehälter 8 schaltet der bis dahin in Sperrstellung befindliche « Governor um und Druckluft strömt aus dem Vorratsbehälter 8 über die Leitung 13 und den Eingang 14 auf den Leerlauf-Schaltkolben 11. Die dadurch ausgelöste Hubbewegung des Leerlauf-Schaltkolbens 11 stößt mit dem Stößel 11 a das Leerlauf-Ventil 12 auf, und zwar so lange, bis bei einem bestimmten Druckabfall im Vorratsbehälter 8 der « Governor » wieder zurückschaltet und der nunmehr druckentlastete Leerlauf-Schaltkolben 11 mit Hilfe der Spannung der Feder 111b in seine Anfangslage zurückkehrt.After reaching a certain pressure in the reservoir 8 conveyed by the air compressor, the governor, which had previously been in the blocking position, switches over and compressed air flows from the reservoir 8 via line 13 and the inlet 14 to the idle switching piston 11. The stroke movement of the idle triggered thereby -Switching piston 11 pushes the idle valve 12 with the plunger 11 a until the «governor» switches back again when there is a certain pressure drop in the reservoir 8 and the now depressurized idle switch piston 11 with the aid of the tension of the spring 111b returns to its initial position.

Das somit entlastete Leerlauf-Ventil 12 kehrt ebenfalls bei einem Verdichtungshub des Verdichterkolbens in seine Ventilschließstellung zurück. Während der Offenstellung des Leerlauf-Ventils 12 findet ein ungehinderter Luftaustausch zwischen dem Verdichtungsraum 1 und dem Saugraum 2 statt, d. h. es wird keine Druckluft über das Druckventil 6 und den Druckraum 4 in den Vorratsbehälter 8 gefördert.The idle valve 12 thus relieved likewise returns to its valve closed position during a compression stroke of the compressor piston. During the open position of the idle valve 12, an unimpeded air exchange takes place between the compression chamber 1 and the suction chamber 2, i. H. no compressed air is conveyed into the reservoir 8 via the pressure valve 6 and the pressure chamber 4.

Claims (8)

1. Apparatus for producing compressed gas, especially for a compressed-air brake system, having the following features :
a) a reciprocating piston compressor having a compression volume (1), a suction chamber (2) and a pressure chamber (4) is provided, it being possible for the compression volume (1) to be connected to the suction chamber (2) by way of a suction valve (3) and to the pressure chamber (4) by way of a pressure valve (6) ;
b) the pressure chamber (4) has a compressed-gas outlet (5) ;
c) the compressed-gas outlet (5) is connected by way of a pressure line (7) to a consumer, especially a consumer designed as a reservoir (8) ;
d) a pressure control valve device (9) connected between the consumer (8) and the suction chamber (2) is provided which switches the compressor from a delivery mode to an idle mode when a predetermined pressure has been reached in the consumer unit (8) ;
e) means are provided which, when the pressure control valve device (9) is switched to the idle mode, produce a connection between the compression volume (1) and the suction chamber (2) of the air compressor that is permanently open during the idle mode and which close this connection again when the pressure control valve device (9) is switched back to the delivery mode, characterised by the following features :
f) the suction valve (3) arranged between the suction chamber (2) and the compression volume (1) comprises a valve lamella which opens into the compression volume (1) during the suction phase of the air compressor ;
g) the means for producing a connection between the compression volume (1) and the suction chamber (2) that is permanently open during the idle mode comprise an idle valve device (11, 12) that is independent of the suction valve (3) and can be subjected to the pressure from the pressure control valve device (9) ;
h) the idle valve device (11,12) is arranged in such a manner that it does not project into the region in which the piston of the compressor travels.
2. Apparatus according to claim 1, characterised by the following features :
a) the idle valve device (11, 12) consists of an idle operating piston (11) arranged in the cylinder head (10) of the air compressor and an idle valve (12), arranged between the suction chamber (2) and the compression volume (1), which can be actuated by this operating piston (11) ;
b) the idle operating piston (11) can be subjected to the pressure of the consumer unit (8) by way of the pressure control valve device (9) during the idle mode, the stroke movement caused thereby opening the idle valve (12).
3. Apparatus according to claim 1 or 2, characterised by the following feature : the pressure control valve device (9) is integral with the cylinder head (10).
4. Apparatus according to claim 2 or 3, characterised by the following feature : the idle valve (12, 18) is arranged in the region of a recess (15) in the air-compressor cylinder housing (16), which recess communicates with the compression volume (1) and is outside the cylindrical compression volume (1) formed by the cylinder bore.
5. Apparatus according to claims 2 and 3, characterised by the following feature : the idle valve (19) is arranged in a recess (20) in the valve plate (21) that carries the suction valve and the pressure valve.
6. Apparatus according to claim 5, characterised by the following feature : the recess (20) is inside the compression volume (1) formed by the cylinder bore and inside the valve plate (21) that carries the suction valve and the pressure valve.
7. Apparatus according to any one of the preceding claims, characterised by the following feature : the idle valve (12, 19) is formed by a resilient lamella.
8. Apparatus according to claims 1 to 5, characterised by the following features :
a) the idle valve (18) is formed by a rigid plate ;
b) under the rigid plate is arranged a spring (18a) which biases it in the closing direction of the idle valve (18).
EP82111467A 1982-04-21 1982-12-10 Apparatus for generating gas under pressure Expired EP0091994B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82111467T ATE25749T1 (en) 1982-04-21 1982-12-10 DEVICE FOR GENERATION OF COMPRESSED GAS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3214713 1982-04-21
DE19823214713 DE3214713A1 (en) 1982-04-21 1982-04-21 DEVICE FOR PRODUCING PRESSURE GAS

Publications (2)

Publication Number Publication Date
EP0091994A1 EP0091994A1 (en) 1983-10-26
EP0091994B1 true EP0091994B1 (en) 1987-03-04

Family

ID=6161465

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82111467A Expired EP0091994B1 (en) 1982-04-21 1982-12-10 Apparatus for generating gas under pressure

Country Status (5)

Country Link
US (1) US4522568A (en)
EP (1) EP0091994B1 (en)
JP (1) JPS58183885A (en)
AT (1) ATE25749T1 (en)
DE (2) DE3214713A1 (en)

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Also Published As

Publication number Publication date
DE3214713A1 (en) 1983-10-27
JPH0514109B2 (en) 1993-02-24
US4522568A (en) 1985-06-11
JPS58183885A (en) 1983-10-27
DE3275578D1 (en) 1987-04-09
EP0091994A1 (en) 1983-10-26
ATE25749T1 (en) 1987-03-15

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