EP0685038B1 - Liquid ring machine and process for operating it - Google Patents

Liquid ring machine and process for operating it Download PDF

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Publication number
EP0685038B1
EP0685038B1 EP94906852A EP94906852A EP0685038B1 EP 0685038 B1 EP0685038 B1 EP 0685038B1 EP 94906852 A EP94906852 A EP 94906852A EP 94906852 A EP94906852 A EP 94906852A EP 0685038 B1 EP0685038 B1 EP 0685038B1
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EP
European Patent Office
Prior art keywords
liquid ring
ring machine
liquid
working chamber
impeller
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Expired - Lifetime
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EP94906852A
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German (de)
French (fr)
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EP0685038A1 (en
Inventor
Peter Trimborn
Kurt-Willy Mugele
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Siemens AG
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Siemens AG
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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
    • F04C28/06—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for stopping, starting, idling or no-load operation
    • 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
    • F04C19/00—Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
    • F04C19/004—Details concerning the operating liquid, e.g. nature, separation, cooling, cleaning, control of the supply

Definitions

  • the invention relates to a method for operating a liquid ring machine and a liquid ring machine for performing the method.
  • the work space is divided into two equal work spaces by a wall part axially dividing the impeller and by an intermediate wall of the housing shell arranged in the same plane with this wall part. During operation, a liquid ring is formed in each work area.
  • Separate suction and discharge ports are assigned to each work area. Furthermore, the sub-work rooms in the lower area are connected to one another by openings in order to be able to simultaneously empty both sub-work rooms through a common outlet. With such a pump, two different gases, different pressures, can be pumped simultaneously.
  • CH-A-285 570 discloses a two-stage liquid ring pump, the first stage of which is designed for a larger delivery volume than the second downstream stage. Difficulties generally arise with such pumps when they have to operate in a low vacuum.
  • the volume of funding in the first stage is significantly greater than that in the second stage.
  • the second stage cannot process the quantity delivered by the first. This causes congestion, which reduce the performance of the pump and can also damage the pump.
  • This operating point must be run through each time the pump starts up. This is why provided in this known pump to make the second stage (high pressure stage) ineffective by withdrawing operating fluid until the ratio of the suction volume to the final volume corresponds to the ratio of the delivery volume of the first stage to that of the second stage. So much operating fluid is drawn from the second stage that its delivery is interrupted. This means that the liquid ring remains in the second liquid stage, which requires a corresponding amount of energy to drive it.
  • the object of the invention is to specify a method for adapting a liquid ring machine to different load cases and to create a liquid ring machine for carrying out the method.
  • This object is achieved by a method for operating a liquid ring machine, the apex of which lies in the geodetically upper region of the working area and whose working area is divided into at least two partial working spaces, in which method at least one partial working space of the liquid ring machine is separated from the operating fluid supply and at least as far as it is emptied from the operating fluid is that the part of the impeller rotating in this partial working space does not come into engagement with the operating fluid, and this partial working space is shut off on the suction and / or pressure side.
  • the position of the apex in the geodetically upper area of the working area ensures that the eccentricity of the impeller is selected so that in the geodetically lower area of the working area there is a sufficient distance between the free blade ends of the impeller and the housing inner wall of the working area in which can collect any sump liquid without engaging the free blade ends of the impeller.
  • the regulation of the internal pressure according to claim 2 has the effect that the energy consumption of the part of the impeller which is idling in a switched off working area is minimized.
  • the axial force which arises as a result of the pressure differences existing between the partial working spaces is also exerted on the impeller and thus also kept negligibly small on the impeller shaft.
  • the interactions at the gap between the impeller of the liquid ring machine and the intermediate wall surrounding the impeller are significantly reduced.
  • a further energy saving results in that the sump liquid collecting in the geodetically lower region of a switched-off partial working space is kept at such a level that the sump liquid does not come into engagement with the impeller of the liquid ring machine.
  • the method can be carried out in an advantageous manner with a liquid ring machine designed according to claim 4.
  • the setting of the internal pressure of at least one switched off working area approximately equal to the internal pressure of at least one remaining working area can be achieved in a particularly simple manner by at least on one side of the liquid ring machine the arranged suction nozzle is also in flow connection via an external connecting line with a partial working area adjacent to the other side .
  • the negative pressure prevailing in the suction area of the partial work space in operation causes the switched off part of the work space to be evacuated without further aids.
  • the external connecting line has a pressure reducing device, it is possible to regulate the internal pressure of a switched-off partial work space in the desired manner.
  • a pressure network or vacuum network which is often already present, can be used to regulate the pressure balance of a switched-off work area.
  • the impeller shaft is supported by a double-acting tapered roller bearing.
  • This bearing can absorb increased axial forces in addition to the radial forces.
  • each part of the working area can be connected to a liquid discharge device, it is advantageous to provide the operating liquid supply with a shut-off element on at least one machine side so that in the event of a partial switch-off, operating liquid is not even unnecessarily supplied.
  • the shut-off of the operating fluid supply can also be controlled.
  • the shaft seals of the liquid ring machine designed according to claim 11 limit the atmospheric gas entry into a switched-off partial working space. Otherwise, the passive part of the Atmospheric gas pressure setting the work space impair the efficiency of the liquid ring machine, or unnecessarily burden the regulation of the pressure balance for this partial work space.
  • a partial emptying of the liquid ring machine can take place particularly quickly through a separate emptying opening in each work area, so that the partial shutdown can be carried out immediately if necessary.
  • the operating fluid flowing out of the switched-off partial working space during a partial shutdown is supplied to the operating fluid supply of an operating partial working space in that the emptying opening at least one partial work space is connected to the operating fluid supply of at least one other partial work space.
  • the sump liquid that collects in the geodetically lower area of the switched off part of the work space is automatically sucked into the remaining work space because it is in the compression area of the part work space that is in operation the prevailing pressure is below the pressure which arises in a switched-off work area, provided that no additional means for adjusting the internal pressure are provided for the switched-off work area. This means that no further precautions are required to drain the sump liquid.
  • An adequate way to automatically return the sump liquid in a partial work space in operation is to connect the drain opening of at least one partial work space to the suction area of at least one other partial work space.
  • connections leading away from the outlet openings of the partial working spaces are most conveniently designed as closed conduit channels. These can then be arranged either inside or outside the machine housing.
  • a faster and more effective emptying of the part work area provided for the shutdown, as well as the regulation of the sump liquid flowing into this part work area to a constant level, is possible by connecting at least one controllable extraction pump to the part work rooms.
  • the gap between the impeller and the intermediate wall surrounding the impeller is provided with a non-contact seal, the interactions at this gap, in particular the overflow of operating fluid, between a part of the working area that remains in operation and a switched off part of the working area are kept low.
  • Such a non-contact seal can advantageously be designed according to the features of claim 21.
  • a working space is formed by a machine housing 3 which is closed off at the end by flat control disks 2.
  • an impeller 4 provided with blades, the axis of which is arranged eccentrically with respect to the axis of the machine housing 3.
  • the shaft 5 of the impeller 4 is rotatably supported on the end face in side plates 6 of the liquid ring machine 1 connected to the machine housing 3.
  • 6 stuffing box packings are provided in the side plates, not visible in the drawing.
  • the impeller 4 is axially divided in the middle by a wall part 8 which extends over the entire circumference of the impeller 4 and extends in the radial direction from the impeller hub to the free ends of the blades of the impeller 4.
  • a wall part 8 With the wall part 8 lying in one plane, an intermediate wall 9 is provided which concentrically surrounds the impeller 4 and is fixedly connected to the machine housing 3. There is an operationally necessary gap 14 between the wall part 8 and the intermediate wall 9.
  • the wall part 8 and the intermediate wall 9 divide the working space into two equally large partial working spaces 10, 11, furthermore between a switched off partial working space; a distinction is made between the passive sub-work space 11 and a sub-work space in operation, the active sub-work space 10.
  • the two sub-work rooms 10, 11 are designed identically and each sub-work room 10, 11 can therefore be used as an active or passive sub-work room 10 or 11.
  • a partial work space is shown as a passive partial work space 11.
  • This passive sub-work space 11 is provided with an emptying opening 12 which is suitable for its total emptying and which has a a connecting line 19 is in flow connection.
  • a sump drain 21 with a relief connection 13 is arranged in the geodetically lower region of the partial working space 11.
  • Both sub-work rooms 10, 11 are each provided with pressure and suction ports 20, only the suction port 20 being visible in the drawing.
  • the passive sub-work space 11 is connected via an evacuation line 22 to the suction port 20 of the active sub-work space 10.
  • the evacuation line 22 is provided with a control valve 23. A possible connection of the active sub-work space 10 with the suction connection 20 adjacent to the passive sub-work space 11 is not shown.
  • the connection of the corresponding machine side 1 to the pumped medium is first interrupted via the pressure and suction ports 20.
  • the separate operating fluid supply of one part of the work space 11 is also switched off.
  • the emptying opening 12 is opened, so that the operating liquid of the now passive partial working space 11 can flow out.
  • the outflowing operating fluid of the passive partial working space 11 can be supplied to the operating fluid supply of the active partial working space 10 via the connecting line 19.
  • the liquid ring machine 1 After the passive partial working space 11 has been emptied, the liquid ring machine 1 operates in the partially switched-off state. Now flows through the operationally necessary gap 14 between the wall part 8 and the intermediate wall 9 Operating fluid from the active workspace 10 into the passive workspace 11. As a result, a sump liquid 15 collects in the lower region of the passive partial working space 11, the level 16 of which, if possible, should not reach the blade region 17 of the impeller 4. For this reason, separate outlet openings are provided in order to derive the sump liquid 15 in both partial working spaces 10 and 11, which are shown only for the passive partial working space 11. In the embodiment shown in the drawing, several options for designing the outlet openings are shown, which can be used individually or together.
  • a sump drain 21 provided in the geodetically lower region of the machine housing 3 serves as the outlet opening.
  • the sump liquid 15 flowing out here can also be supplied to the operating fluid of the active partial working space 10 via a further relief connection 13.
  • the sump drain 21 can also be connected to a barometric downpipe, the height of which is determined by the internal pressure and the level of the sump liquid.
  • a connection opening 18 located in the intermediate wall 9 also fulfills the function of an outlet opening for the sump liquid 15.
  • the passive partial working space 11 When operating the liquid ring machine 1 according to claim 2, it is necessary to regulate the internal pressure of the passive partial working space 11 so that it is less than or at most equal to the internal pressure of the active partial working space 10. This is achieved in a simple manner in that the passive partial working space 11 is connected to the suction port 20 of the active partial working space 10 via an evacuation line 22. The negative pressure prevailing at this point then also arises in the passive partial working space 11. A further intervention possibility is provided via a control valve 23 in the evacuation line 22. The internal pressure of the passive partial working space 11 can thus be set such that any sump liquid flows out through the outlet openings provided for this, as already described.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

A process for operating a liquid ring machine (1), in which a partial working chamber (10 or 11) of the liquid ring machine (1) is separated from the operating liquid supply and emptied of the operating liquid to the point at which the part of the rotor disc (4) rotating in this partial working chamber (10 or 11) is not in contact with the operating liquid and said partial chamber (10 or 11) is blocked off on the intake and/or pressure side. This process permits the partial switch-off of the liquid ring machine (1) as desired and thus adaptation to the actual process requirements. This reduces the capital outlay and the power consumption during running of such a liquid ring machine (1).

Description

Die Erfindung betrifft ein Verfahren zum Betrieb einer Flüssigkeitsringmaschine sowie eine Flüssigkeitsringmaschine zur Durchführung des Verfahrens.The invention relates to a method for operating a liquid ring machine and a liquid ring machine for performing the method.

Bei einer aus der DE-C- 961 653 bekannten Flüssigkeitsringmaschine ist der Arbeitsraum durch ein das Laufrad axial unterteilendes Wandteil und durch eine mit diesem Wandteil in gleicher Ebene angeordnete Zwischenwand des Gehausemantels in zwei gleich große Teilarbeitsräume unterteilt. Während des Betriebes bildet sich in jedem Teilarbeitsraum ein Flüssigkeitsring.In a liquid ring machine known from DE-C-961 653, the work space is divided into two equal work spaces by a wall part axially dividing the impeller and by an intermediate wall of the housing shell arranged in the same plane with this wall part. During operation, a liquid ring is formed in each work area.

Jedem Teilarbeitsraum sind separate Saug- und Druckstutzen zugeordnet. Ferner sind die Teilarbeitsräume im unteren Bereich miteinander durch Öffnungen verbunden, um eine gleichzeitige Entleerung beider Teilarbeitsräume durch einen gemeinsamen Auslaß vornehmen zu können. Mit einer solchen Pumpe können, zwei voneinander verschiedene Gase, unterschiedlichen Drucks, gleichzeitig gefördert werden.Separate suction and discharge ports are assigned to each work area. Furthermore, the sub-work rooms in the lower area are connected to one another by openings in order to be able to simultaneously empty both sub-work rooms through a common outlet. With such a pump, two different gases, different pressures, can be pumped simultaneously.

Durch die CH-A-285 570 ist eine zweistufige Flüssigkeitsringpumpe bekannt, deren erste Stufe für ein größeres Fördervolumen ausgelegt ist als deren zweite nachgeschaltete Stufe. Bei solchen Pumpen treten generell Schwierigkeiten auf, wenn sie bei niederem Vakuum arbeiten müssen.CH-A-285 570 discloses a two-stage liquid ring pump, the first stage of which is designed for a larger delivery volume than the second downstream stage. Difficulties generally arise with such pumps when they have to operate in a low vacuum.

In diesem Falle ist das Fördervolumen der ersten Stufe wesentlich größer als das der zweiten Stufe. Die zweite Stufe kann die von der ersten geförderten Menge nicht verarbeiten. Es treten dadurch Stauungen auf, die die Leistungsfähigkeit der Pumpe mindern und auch zu einer Schädigung der Pumpe führen können. Dieser Betriebspunkt muß bei jedem Anfahrvorgang der Pumpe durchlaufen werden. Aus diesem Grunde ist bei dieser bekannten Pumpe vorgesehen, die zweite Stufe (Hochdruckstufe) durch Entnahme von Betriebsflüssigkeit solange unwirksam zu machen, bis das Verhältnis des Ansaugvolumens zum Endvolumen dem Verhältnis des Fördervolumens der ersten Stufe zu demjenigen der zweiten Stufe entspricht. Es wird der zweiten Stufe so viel Betriebsflüssigkeit entnommen, daß deren Förderung unterbrochen ist. Damit bleibt in der zweiten Flüssigkeitsstufe noch der Flüssigkeitsring bestehen, der zu seinem Antrieb eine entsprechende Energiemenge benötigt.In this case, the volume of funding in the first stage is significantly greater than that in the second stage. The second stage cannot process the quantity delivered by the first. This causes congestion, which reduce the performance of the pump and can also damage the pump. This operating point must be run through each time the pump starts up. This is why provided in this known pump to make the second stage (high pressure stage) ineffective by withdrawing operating fluid until the ratio of the suction volume to the final volume corresponds to the ratio of the delivery volume of the first stage to that of the second stage. So much operating fluid is drawn from the second stage that its delivery is interrupted. This means that the liquid ring remains in the second liquid stage, which requires a corresponding amount of energy to drive it.

Aufgabe der Erfindung ist es dagegen, ein Verfahren zur Anpassung einer Flüssigkeitsringmaschine an unterschiedliche Belastungsfälle anzugeben sowie eine Flüssigkeitsringmaschine zur Durchführung des Verfahrens zu schaffen.The object of the invention, however, is to specify a method for adapting a liquid ring machine to different load cases and to create a liquid ring machine for carrying out the method.

Diese Aufgabe wird durch ein Verfahren zum Betrieb einer Flüssigkeitsringmaschine gelöst, deren Scheitel im geodätisch oberen Bereich des Arbeitsraumes liegt und deren Arbeitsraum in mindestens zwei Teilarbeitsräume unterteilt ist, bei welchem Verfahren wenigstens ein Teilarbeitsraum der Flüssigkeitsringmaschine von der Betriebsflüssigkeitszufuhr abgetrennt und wenigstens soweit von der Betriebsflüssigkeit entleert wird, daß der in diesem Teilarbeitsraum umlaufende Teil des Laufrades nicht mit der Betriebsflüssigkeit in Eingriff gerät, und dieser Teilarbeitsraum saug- und/oder druckseitig abgesperrt wird. Durch die Lage des Scheitels im geodätisch oberen Bereich des Arbeitsraumes ist sichergestellt, daß die Exzentrizität des Laufrades so gewählt ist, daß im geodätisch unteren Bereich des Arbeitsraumes ein ausreichender Abstand zwischen den freien Schaufelenden des Laufrades und der Gehäuseinnenwand des Arbeitsraumes vorhanden ist, in dem sich eine etwaige Sumpfflüssigkeit sammeln kann, ohne mit den freien Schaufelenden des Laufrades in Eingriff zu gelangen.This object is achieved by a method for operating a liquid ring machine, the apex of which lies in the geodetically upper region of the working area and whose working area is divided into at least two partial working spaces, in which method at least one partial working space of the liquid ring machine is separated from the operating fluid supply and at least as far as it is emptied from the operating fluid is that the part of the impeller rotating in this partial working space does not come into engagement with the operating fluid, and this partial working space is shut off on the suction and / or pressure side. The position of the apex in the geodetically upper area of the working area ensures that the eccentricity of the impeller is selected so that in the geodetically lower area of the working area there is a sufficient distance between the free blade ends of the impeller and the housing inner wall of the working area in which can collect any sump liquid without engaging the free blade ends of the impeller.

Hierdurch gelingt eine vollständige Teilabschaltung der Flüssigkeitsringmaschine. Damit ist eine ebenso einfache wie wirksame Anpassung des Saugvermögens einer Flüssigkeitsringmaschine an die erforderlichen Betriebsbedingungen gegeben. Diese Anpassungsmöglichkeit an die tatsächlichen Betriebsbedingungen ist deshalb von besonderem Vorteil, weil sich bei solchen Anlagen die tatsächlichen Betriebsbedingungen nicht exakt vorherbestimmen lassen. Insofern ist es leicht möglich, daß eine eventuell überdimensionierte Flüssigkeitsringmaschine installiert wird. Durch die Teilabschaltung einer solchen Flüssigkeitsringmaschine lassen sich dann die Betriebskosten erheblich senken. Bisher war eine solche Anpassung nur bei einem Betrieb mit mehreren Flüssigkeitsringmaschinen möglich. Das erfindungsgemäße Verfahren bietet demgegenüber eine erhebliche Einsparung bei den Investitionskosten. Darüber hinaus ist auch der Platzbedarf für nur eine nach dem erfindungsgemäßen Verfahren betriebene Flüssigkeitsringmaschine wesentlich geringer.This enables a complete partial shutdown of the liquid ring machine. This provides a simple and effective adaptation of the pumping speed of a liquid ring machine to the required operating conditions. This possibility of adaptation to the actual operating conditions is particularly advantageous because the actual operating conditions cannot be predicted exactly in such systems. In this respect, it is easily possible that a possibly oversized liquid ring machine is installed. The partial shutdown of such a liquid ring machine can then significantly reduce operating costs. Until now, such an adjustment was only possible when operating with several liquid ring machines. In contrast, the method according to the invention offers considerable savings in investment costs. In addition, the space requirement for only one liquid ring machine operated according to the method according to the invention is also considerably less.

Die Regelung des Innendrucks gemäß Anspruch 2 bewirkt, daß der Energieverbrauch des in einem abgeschalteten Teilarbeitsraum leerlaufenden Teiles des Laufrades minimiert wird. Bei einer solchen Druckregelung wird auch die sich infolge der zwischen den Teilarbeitsräumen bestehenden Druckunterschiede einstellende Axialkraft auf das Laufrad und damit auch auf die Laufradwelle vernachläßigbar klein gehalten. Im übrigen werden die Wechselwirkungen an dem zwischen dem Laufrad der Flüssigkeitsringmaschine und der das Laufrad umschließenden Zwischenwand betriebsnotwendig bestehenden Spalt erheblich reduziert.The regulation of the internal pressure according to claim 2 has the effect that the energy consumption of the part of the impeller which is idling in a switched off working area is minimized. With such a pressure control, the axial force which arises as a result of the pressure differences existing between the partial working spaces is also exerted on the impeller and thus also kept negligibly small on the impeller shaft. In addition, the interactions at the gap between the impeller of the liquid ring machine and the intermediate wall surrounding the impeller are significantly reduced.

Eine weitere Energieersparnis ergibt sich, in dem die sich im geodätisch unteren Bereich eines abgeschalteten Teilarbeitsraumes sammelnde Sumpfflüssigkeit auf einem solchen Pegel gehalten wird, daß die Sumpfflüssigkeit nicht mit dem Laufrad der Flüssigkeitsringmaschine in Eingriff gelangt.A further energy saving results in that the sump liquid collecting in the geodetically lower region of a switched-off partial working space is kept at such a level that the sump liquid does not come into engagement with the impeller of the liquid ring machine.

Das Verfahren kann in vorteilhafter Weise mit einer gemäß Anspruch 4 ausgebildeten Flüssigkeitsringmaschine durchgeführt werden.The method can be carried out in an advantageous manner with a liquid ring machine designed according to claim 4.

Die Einstellung des Innendrucks wenigstens eines abgeschalteten Teilarbeitsraumes etwa gleich dem Innendruck wenigstens eines im Betrieb verbleibenden Teilarbeitsraumes gelingt in besonders einfacher Weise, indem mindestens auf einer Seite der Flüssigkeitsringmaschine der angeordnete Saugstutzen zusätzlich über eine externe Verbindungsleitung mit einem der jeweils anderen Seite benachbarten Teilarbeitsraum in Strömungsverbindung steht. Der im Ansaugbereich des im Betrieb befindlichen Teilarbeitsraumes herrschende Unterdruck bewirkt eine Evakuierung des abgeschalteten Teils des Arbeitsraumes ohne weitere Hilfsmittel.The setting of the internal pressure of at least one switched off working area approximately equal to the internal pressure of at least one remaining working area can be achieved in a particularly simple manner by at least on one side of the liquid ring machine the arranged suction nozzle is also in flow connection via an external connecting line with a partial working area adjacent to the other side . The negative pressure prevailing in the suction area of the partial work space in operation causes the switched off part of the work space to be evacuated without further aids.

Dadurch, daß die externe Verbindungsleitung eine Druckminderungseinrichtung aufweist, ist es möglich den Innendruck eines abgeschalteten Teilarbeitsraumes in der gewünschten Weise zu regeln.Because the external connecting line has a pressure reducing device, it is possible to regulate the internal pressure of a switched-off partial work space in the desired manner.

Für bestimmte Einsatzfälle kann es vorteilhaft sein, mindestens einen Teilarbeitsraum mit einem Anschluß für eine Evakuierungseinrichtung zu versehen. So kann beispielsweise ein oft schon vorhandenes Drucknetz oder Vakuumnetz zur Regelung des Druckhaushaltes eines abgeschalteten Teilarbeitsraumes benutzt werden.For certain applications, it can be advantageous to provide at least one partial work space with a connection for an evacuation device. For example, a pressure network or vacuum network, which is often already present, can be used to regulate the pressure balance of a switched-off work area.

Bei einer gemäß Anspruch 8 ausgestatteten Flüssigkeitsringmaschine ist es auch möglich, daß erfindungsgemäße Verfahren ohne zusätzliche Einrichtungen zur Regelung des Druckhaushaltes eines abgeschalteten Teilarbeitsraumes durchzuführen. Die bei nicht geregeltem Innendruck auftretenden Axialkräfte werden dann von der entsprechend ausgebildeten Lagerung aufgenommen.In the case of a liquid ring machine equipped according to claim 8, it is also possible for the method according to the invention to be carried out without additional devices for regulating the pressure balance of a switched-off partial working area. The axial forces that occur when the internal pressure is not regulated are then absorbed by the appropriately designed bearing.

In vorteilhafter Weiterbildung der Erfindung wird gemäß Anspruch 9 die Laufradwelle durch ein doppelt wirkendes Kegelrollenlager gelagert. Diese Lagerung kann zusätzlich zu den radialen Kräften erhöhte axiale Kräfte aufnehmen.In an advantageous development of the invention, the impeller shaft is supported by a double-acting tapered roller bearing. This bearing can absorb increased axial forces in addition to the radial forces.

Obgleich jeder Teilarbeitsraum für sich mit einer Flüssigkeitsabführeinrichtung verbindbar ist, ist es vorteilhaft die Betriebsflüssigkeitszufuhr auf mindestens einer Maschinenseite mit einem Absperrglied zu versehen, um im Falle einer Teilabschaltung gar nicht erst unnötig Betriebsflüssigkeit zuzuführen. Die Absperrung der Betriebsflüssigkeitszufuhr kann auch gesteuert erfolgen.Although each part of the working area can be connected to a liquid discharge device, it is advantageous to provide the operating liquid supply with a shut-off element on at least one machine side so that in the event of a partial switch-off, operating liquid is not even unnecessarily supplied. The shut-off of the operating fluid supply can also be controlled.

Die gemäß Anspruch 11 ausgelegten Wellendichtungen der Flüssigkeitsringmaschine begrenzen den atmosphärischen Gaseintritt in einen abgeschalteten Teilarbeitsraum. Andernfalls könnte der sich in diesem passiven Teil des Arbeitsraumes einstellende atmosphärische Gasdruck den Wirkungsgrad der Flüssigkeitsringmaschine beeinträchtigen, oder unnötig die Regelung des Druckhaushaltes für diesen Teilarbeitsraum belasten.The shaft seals of the liquid ring machine designed according to claim 11 limit the atmospheric gas entry into a switched-off partial working space. Otherwise, the passive part of the Atmospheric gas pressure setting the work space impair the efficiency of the liquid ring machine, or unnecessarily burden the regulation of the pressure balance for this partial work space.

Um frei wählen zu können, welcher Teilarbeitsraum abgeschaltet wird, ist eine Unterteilung in gleichgroße Teilarbeitsräume gemäß Anspruch 12 vorteilhaft. Eine solche Unterteilung bietet zusätzliche fertigungstechnische Vorteile, da beide Teilarbeitsräume gleichdimensioniert ausgeführt werden können.In order to be able to freely choose which sub-work space is to be switched off, a subdivision into sub-work spaces of equal size is advantageous. Such a subdivision offers additional advantages in terms of production technology, since both sub-work rooms can be designed with the same dimensions.

Es ist vorteilhaft, eine Flüssigkeitsringmaschine zur Durchführung des Verfahrens zu verwenden, bei der der Scheitel im geodätisch oberen Bereich des Arbeitsraumes liegt. Hierdurch ist sichergestellt, daß die Exzentrizität des Laufrades so gewählt ist, daß im geodätisch unteren Bereich des Arbeitsraumes ein ausreichender Abstand zwischen den freien Schaufelenden des Laufrades und der Gehäuseinnenwand des Arbeitsraumes vorhanden ist, in dem sich eine etwaige Sumpfflüssigkeit sammeln kann, ohne mit den freien Schaufelenden des Laufrades in Eingriff zu gelangen.It is advantageous to use a liquid ring machine for carrying out the method, in which the apex lies in the geodetically upper region of the working area. This ensures that the eccentricity of the impeller is selected so that there is a sufficient distance between the free blade ends of the impeller and the inner wall of the housing in the geodetically lower area of the working space, in which any sump liquid can collect, without using the free To engage blade ends of the impeller.

Eine teilweise Entleerung der Flüssigkeitsringmaschine kann durch eine gesonderte Entleerungsöffnung in jedem Teilarbeitsraum gemäß Anspruch 14 besonders schnell erfolgen, so das die Teilabschaltung im Bedarfsfall unverzüglich durchführbar ist.A partial emptying of the liquid ring machine can take place particularly quickly through a separate emptying opening in each work area, so that the partial shutdown can be carried out immediately if necessary.

Die bei einer Teilabschaltung aus dem abgeschalteten Teilarbeitsraum ausströmende Betriebsflüssigkeit wird der Betriebsflüssigkeitsversorgung eines in Betrieb befindlichen Teilarbeitsraumes dadurch zugeführt, daß die Entleerungsöffnung wenigstens eines Teilarbeitsraumes jeweils mit der Betriebsflüssigkeitszufuhr wenigstens eines anderen Teilarbeitsraumes verbunden ist.The operating fluid flowing out of the switched-off partial working space during a partial shutdown is supplied to the operating fluid supply of an operating partial working space in that the emptying opening at least one partial work space is connected to the operating fluid supply of at least one other partial work space.

Dadurch, daß die Entleerungsöffnung wenigstens eines Teilarbeitsraumes mit dem Verdichtungsbereich wenigstens eines anderen Teilarbeitsraumes verbunden ist, wird die sich im geodätisch unteren Bereich des abgeschalteten Teiles des Arbeitsraumes sammelnde Sumpfflüssigkeit selbsttätig in den im Betrieb befindlichen Restarbeitsraum gesaugt, da der im Verdichtungsbereich des in Betrieb befindlichen Teilarbeitsraumes herrschende Druck unterhalb des sich in einem abgeschalteten Teilarbeitsraum einstellenden Druckes liegt, sofern keine zusätzlichen Mittel zur Einstellung des Innendrucks für den abgeschalteten Teilarbeitsraum vorgesehen sind. Damit sind keine weiteren Vorkehrungen zur Abführung der Sumpfflüssigkeit erforderlich.Because the emptying opening of at least one part of the work space is connected to the compression area of at least one other part of the work space, the sump liquid that collects in the geodetically lower area of the switched off part of the work space is automatically sucked into the remaining work space because it is in the compression area of the part work space that is in operation the prevailing pressure is below the pressure which arises in a switched-off work area, provided that no additional means for adjusting the internal pressure are provided for the switched-off work area. This means that no further precautions are required to drain the sump liquid.

Eine adäquate Möglichkeit, die Sumpfflüssigkeit in einem in Betrieb befindlichen Teilarbeitsraum selbsttätig zurückzuführen, ist die Verbindung der Entleerungsöffnung wenigstens eines Teilarbeitsraumes mit dem Ansaugbereich wenigstens eines anderen Teilarbeitsraumes. In Folge des Druckunterschiedes zwischen dem Ansaugbereich eines in Betrieb befindlichen Teilarbeitsraumes und eines abgeschalteten Teilarbeitsraumes strömt die Sumpfflüssigkeit in einen in Betrieb befindlichen Teilarbeitsraum.An adequate way to automatically return the sump liquid in a partial work space in operation is to connect the drain opening of at least one partial work space to the suction area of at least one other partial work space. As a result of the pressure difference between the suction area of a part work area in operation and a part work area that is switched off, the sump liquid flows into a part work area that is in operation.

Die obengenannten, von den Auslaßöffnungen der Teilarbeitsräume wegführenden Verbindungen sind am zweckmäßigsten als geschlossene Leitungskanäle ausgeführt. Diese können dann wahlweise innerhalb oder außerhalb des Maschinengehäuses angeordnet werden.The above-mentioned connections leading away from the outlet openings of the partial working spaces are most conveniently designed as closed conduit channels. These can then be arranged either inside or outside the machine housing.

Eine schnellere und wirksamere Entleerung des zur Abschaltung vorgesehenen Teilarbeitsraumes, so wie die Regelung der in diesen Teilarbeitsraum überströmenden Sumpfflüssigkeit auf einen konstanten Pegel, ist durch den Anschluß von wenigstens einer steuerbaren Extraktionspumpe an die Teilarbeitsräume möglich.A faster and more effective emptying of the part work area provided for the shutdown, as well as the regulation of the sump liquid flowing into this part work area to a constant level, is possible by connecting at least one controllable extraction pump to the part work rooms.

Dadurch, daß der Spalt zwischen dem Laufrad und der das Laufrad umschließenden Zwischenwand mit einer berührungsfreien Dichtung versehen ist, werden die Wechselwirkungen an diesem Spalt, insbesondere das Überströmen von Betriebsflüssigkeit, zwischen einem im Betrieb verbleibenden Teilarbeitsraum und einem abgeschalteten Teilarbeitsraum gering gehalten.Because the gap between the impeller and the intermediate wall surrounding the impeller is provided with a non-contact seal, the interactions at this gap, in particular the overflow of operating fluid, between a part of the working area that remains in operation and a switched off part of the working area are kept low.

Eine solche berührungsfreie Dichtung kann vorteilhaft gemäß den Merkmalen des Anspruchs 21 beschaffen sein.Such a non-contact seal can advantageously be designed according to the features of claim 21.

Wenn keine Regelung des Druckhaushaltes für einen abgeschalteten Teilarbeitsraum vorgesehen ist, stellt sich in diesem allmählich ein gegenüber einem in Betrieb befindlichen Teilarbeitsraum herrschenden Druck erhöhter Innendruck ein. Dieser Druckunterschied kann gemäß Anspruch 22 zur Abführung der Sumpfflüssigkeit genutzt werden. Dadurch, daß eine die Teilarbeitsräume abteilende Zwischenwand im geodätisch unteren Bereich eine durchgehende Verbindungsöffnung aufweist, strömt die Sumpfflüssigkeit dem sich einstellenden Druckgefälle folgend durch diese Öffnung in einen im Betrieb befindlichen Teilarbeitsraum zurück.If no regulation of the pressure balance is provided for a switched-off work area, this gradually results in an increased internal pressure compared to a work room in operation. This pressure difference can be used according to claim 22 to drain the bottom liquid. Characterized in that a partition wall dividing the partial working spaces has a continuous connection opening in the geodetically lower area, the sump liquid flows back through the opening through this opening into a partial working space which is in operation.

Die Erfindung wird anhand einer in der Zeichnung im Längsschnitt als Ausführungsbeispiel dargestellten Flüssigkeitsringmaschine näher erläutert.The invention is explained in more detail with reference to a liquid ring machine shown in the drawing in longitudinal section as an exemplary embodiment.

Bei der gezeigten Flüssigkeitsringmaschine 1 wird durch ein stirnseitig von ebenen Steuerscheiben 2 abgeschlossenes Maschinengehäuse 3 ein Arbeitsraum gebildet. Innerhalb dieses Arbeitsraumes ist ein mit Schaufeln versehenes Laufrad 4 vorgesehen, dessen Achse gegenüber der Achse des Maschinengehäuses 3 exzentrisch angeordnet ist. Die Welle 5 des Laufrades 4 ist stirnseitig in mit dem Maschinengehäuse 3 verbundenen Seitenschilden 6 der Flüssigkeitsringmaschine 1 drehbar gelagert. Zur Wellenabdichtung sind, in der Zeichnung nicht sichtbar, in den Seitenschilden 6 Stopfbuchspackungen vorgesehen.In the liquid ring machine 1 shown, a working space is formed by a machine housing 3 which is closed off at the end by flat control disks 2. Provided within this working space is an impeller 4 provided with blades, the axis of which is arranged eccentrically with respect to the axis of the machine housing 3. The shaft 5 of the impeller 4 is rotatably supported on the end face in side plates 6 of the liquid ring machine 1 connected to the machine housing 3. For the shaft sealing, 6 stuffing box packings are provided in the side plates, not visible in the drawing.

Das Laufrad 4 ist mittig durch ein sich über den gesamten Umfang des Laufrades 4 erstreckendes Wandteil 8, das in radialer Richtung von der Laufradnabe bis zu den freien Enden der Schaufeln des Laufrades 4 reicht, axial unterteilt. Mit dem Wandteil 8 in einer Ebene liegend, ist eine das Laufrad 4 konzentrisch umschließende mit dem Maschinengehäuse 3 fest verbundene Zwischenwand 9 vorgesehen. Zwischen dem Wandteil 8 und der Zwischenwand 9 besteht ein betriebsnotwendiger Spalt 14.The impeller 4 is axially divided in the middle by a wall part 8 which extends over the entire circumference of the impeller 4 and extends in the radial direction from the impeller hub to the free ends of the blades of the impeller 4. With the wall part 8 lying in one plane, an intermediate wall 9 is provided which concentrically surrounds the impeller 4 and is fixedly connected to the machine housing 3. There is an operationally necessary gap 14 between the wall part 8 and the intermediate wall 9.

Durch das Wandteil 8 und die Zwischenwand 9 ist eine Unterteilung des Arbeitsraumes in zwei gleich große Teilarbeitsräume 10, 11 gegeben, wobei im weiteren zwischen einem abgeschalteten Teilarbeitsraum; dem passiven Teilarbeitsraum 11, und einem im Betrieb befindlichen Teilarbeitsraum, dem aktiven Teilarbeitsraum 10, unterschieden wird. Üblicherweise sind beide Teilarbeitsräume 10, 11 gleich ausgeführt und somit jeder Teilarbeitsraum 10, 11 für sich jeweils als aktiver oder passiver Teilarbeitsraum 10 oder 11 einsetzbar. In der Zeichnung ist nur ein Teilarbeitsraum als passiver Teilarbeitsraum 11 dargestellt. Dieser passive Teilarbeitsraum 11 ist mit einer zu dessen Totalentleerung geeigneten Entleerungsöffnung 12 versehen, die mit einer einer Verbindungsleitung 19 in Strömungsverbindung steht. Im geodätisch unteren Bereich des Teilarbeitsraumes 11 ist ein Sumpfablaß 21 mit einer Entlastungsverbindung 13 angeordnet.The wall part 8 and the intermediate wall 9 divide the working space into two equally large partial working spaces 10, 11, furthermore between a switched off partial working space; a distinction is made between the passive sub-work space 11 and a sub-work space in operation, the active sub-work space 10. Usually, the two sub-work rooms 10, 11 are designed identically and each sub-work room 10, 11 can therefore be used as an active or passive sub-work room 10 or 11. In the drawing, only a partial work space is shown as a passive partial work space 11. This passive sub-work space 11 is provided with an emptying opening 12 which is suitable for its total emptying and which has a a connecting line 19 is in flow connection. A sump drain 21 with a relief connection 13 is arranged in the geodetically lower region of the partial working space 11.

Beide Teilarbeitsräume 10, 11 sind jeweils mit Druck- und Saugstutzen 20 versehen, wobei in der Zeichnung nur der Saugstutzen 20 sichtbar ist. Der passive Teilarbeitsraum 11 ist über eine Evakuierungsleitung 22 mit dem Saugstutzen 20 des aktiven Teilarbeitsraumes 10 verbunden. Die Evakuierungsleitung 22 ist mit einem Steuerventil 23 versehen. Eine etwaige gleichwirkende Verbindung des aktiven Teilarbeitsraumes 10 mit dem dem passiven Teilarbeitsraum 11 benachbarten Saugstutzen 20 ist nicht eingezeichnet.Both sub-work rooms 10, 11 are each provided with pressure and suction ports 20, only the suction port 20 being visible in the drawing. The passive sub-work space 11 is connected via an evacuation line 22 to the suction port 20 of the active sub-work space 10. The evacuation line 22 is provided with a control valve 23. A possible connection of the active sub-work space 10 with the suction connection 20 adjacent to the passive sub-work space 11 is not shown.

Bei einer Teilabschaltung der Flüssigkeitsringmaschine 1 wird zunächst die Verbindung der entsprechenden Maschineseite 1 mit dem Fördermedium über die Druck- und Saugstutzen 20 unterbrochen. Die gesonderte Betriebsflüssigkeitszufuhr des einen Teilarbeitsraumes 11 wird ebenfalls abgeschaltet. Gleichzeitig wird die Entleerungsöffnung 12 geöffnet, so daß die Betriebsflüssigkeit des nunmehr passiven Teilarbeitsraumes 11 ausströmen kann. Die ausströmende Betriebsflüssigkeit des passiven Teilarbeitsraumes 11 kann über die Verbindungsleitung 19 der Betriebsflüssigkeitszufuhr des aktiven Teilarbeitsraumes 10 zugeführt werden.When the liquid ring machine 1 is partially switched off, the connection of the corresponding machine side 1 to the pumped medium is first interrupted via the pressure and suction ports 20. The separate operating fluid supply of one part of the work space 11 is also switched off. At the same time, the emptying opening 12 is opened, so that the operating liquid of the now passive partial working space 11 can flow out. The outflowing operating fluid of the passive partial working space 11 can be supplied to the operating fluid supply of the active partial working space 10 via the connecting line 19.

Nach der Entleerung des passiven Teilarbeitsraumes 11 arbeitet die Flüssigkeitsringmaschine 1 im teilabgeschalteten Zustand. Durch den betriebsnotwendigen Spalt 14 zwischen dem Wandteil 8 und der Zwischenwand 9 strömt nun Betriebsflüssigkeit aus dem aktiven Teilarbeitsraum 10 in den passiven Teilarbeitsraum 11 über. Infolgedessen sammelt sich im unteren Bereich des passiven Teilarbeitsraumes 11 eine Sumpfflüssigkeit 15, deren Pegel 16 nach Möglichkeit nicht den Schaufelbereich 17 des Laufrades 4 erreichen sollte. Aus diesem Grund sind zur Ableitung der Sumpfflüssigkeit 15 in beiden Teilarbeitsräumen 10 und 11 gesonderte Auslaßöffnungen vorgesehen, die nur für den passiven Teil arbeitsraum 11 eingezeichnet sind. In dem in der Zeichnung dargestellten Ausführungsbeispiel sind mehrere Möglichkeiten zur Ausgestaltung der Auslaßöffnungen gezeigt, die einzeln oder gemeinsam eingesetzt werden können. Als Auslaßöffnung dient ein im geodätisch unteren Bereich des Maschinengehäuses 3 vorgesehener Sumpfablaß 21. Auch kann die hier ausströmende Sumpfflüssigkeit 15 über eine weitere Entlastungsverbindung 13 der Betriebsflüssigkeit des aktiven Teilarbeitsraumes 10 zugeführt werden. Der Sumpfablaß 21 kann auch mit einem barometrischen Fallrohr, dessen Höhe nach dem Innendruck und dem Pegel der Sumpfflüssigkeit bestimmt wird, verbunden werden. Ebenfalls die Funktion einer Auslaßöffnung für die Sumpfflüssigkeit 15 erfüllt eine in der Zwischenwand 9 befindliche Verbindungsöffnung 18. Durch diese Verbindungsöffnung 18 strömt die Sumpfflüssigkeit 15 unmittelbar in den aktiven Teilarbeitsraum 10 über, da trotz einer verbesserten Wellenabdichtung durch entsprechend ausgelegte Stopfbuchspackungen, ein Druckanstieg im passiven Teilarbeitsraum 11 stattfinden kann und sich damit ein Druckgefälle von dem passiven Teilarbeitsraum 11 hin zu dem aktiven Teilarbeitsraum 10 einstellt, dem die Sumpfflüssigkeit 15 folgt.After the passive partial working space 11 has been emptied, the liquid ring machine 1 operates in the partially switched-off state. Now flows through the operationally necessary gap 14 between the wall part 8 and the intermediate wall 9 Operating fluid from the active workspace 10 into the passive workspace 11. As a result, a sump liquid 15 collects in the lower region of the passive partial working space 11, the level 16 of which, if possible, should not reach the blade region 17 of the impeller 4. For this reason, separate outlet openings are provided in order to derive the sump liquid 15 in both partial working spaces 10 and 11, which are shown only for the passive partial working space 11. In the embodiment shown in the drawing, several options for designing the outlet openings are shown, which can be used individually or together. A sump drain 21 provided in the geodetically lower region of the machine housing 3 serves as the outlet opening. The sump liquid 15 flowing out here can also be supplied to the operating fluid of the active partial working space 10 via a further relief connection 13. The sump drain 21 can also be connected to a barometric downpipe, the height of which is determined by the internal pressure and the level of the sump liquid. A connection opening 18 located in the intermediate wall 9 also fulfills the function of an outlet opening for the sump liquid 15. Through this connection opening 18, the sump liquid 15 flows directly into the active sub-work space 10, since despite an improved shaft seal through appropriately designed stuffing box packings, a pressure increase in the passive sub-work space 11 can take place and thus a pressure drop arises from the passive partial working space 11 to the active partial working space 10, which is followed by the sump liquid 15.

Bei einem Betrieb der Flüssigkeitsringmaschine 1 gemäß Anspruch 2 ist es erforderlich, den Innendruck des passiven Teilarbeitsraumes 11 so zu regeln, daß er kleiner oder höchstens gleich dem Innendruck des aktiven Teilarbeitsraumes 10 ist. Dies wird in einfacher Weise dadurch bewirkt, daß der passive Teilarbeitsraum 11 über eine Evakuierungsleitung 22 mit dem Saugstutzen 20 des aktiven Teilarbeitsraumes 10 verbunden wird. Der an dieser Stelle herrschende Unterdruck stellt sich dann auch in dem passiven Teilarbeitsraum 11 ein. Über ein Steuerventil 23 in der Evakuierungsleitung 22 ist eine weitere Eingriffsmöglichkeit gegeben. Damit kann der Innendruck des passiven Teilarbeitsraumes 11 so eingegestellt werden, daß etwaige Sumpfflüssigkeit durch die dafür vorgesehenen Auslaßöffnungen, wie bereits beschrieben, ausströmt.When operating the liquid ring machine 1 according to claim 2, it is necessary to regulate the internal pressure of the passive partial working space 11 so that it is less than or at most equal to the internal pressure of the active partial working space 10. This is achieved in a simple manner in that the passive partial working space 11 is connected to the suction port 20 of the active partial working space 10 via an evacuation line 22. The negative pressure prevailing at this point then also arises in the passive partial working space 11. A further intervention possibility is provided via a control valve 23 in the evacuation line 22. The internal pressure of the passive partial working space 11 can thus be set such that any sump liquid flows out through the outlet openings provided for this, as already described.

Claims (21)

  1. Method for operating a liquid ring machine (1), the apex of which lies in the geodetic upper region of the working chamber and the working chamber of which is subdivided into at least two partial working chambers, with which method at least one partial working chamber (10 or 11) of the liquid ring machine (1) is separated from the supply of operating liquid and is drained of the operating liquid at least to the extent where the part of the impeller (4) rotating in this partial working chamber does not come into contact with the operating liquid, and this partial working chamber (10 or 11) is blocked on the suction and/or pressure side.
  2. Method according to claim 1, where the internal pressure of a disconnected partial working chamber (10 or 11) is adjusted to more or less equal the intake pressure of at least one partial working chamber (10 or 11) remaining in operation.
  3. Method according to claim 1 or 2, where the level (16) of a sump liquid (15) which collects from the operating liquid overflowing from a partial working chamber currently in operation in the geodetic lower area of the disconnected partial working chamber (10 or 11) is maintained such that the sump liquid (15) does not come into contact with the impeller (4) of the liquid ring machine (1).
  4. Liquid ring machine (1) for implementing the method according to claim 1 or 3, where, inside its machine housing (3) an impeller (4) provided with blades is rotatably mounted with its impeller shaft (5) in side shields (6) arranged on both sides of the machine housing (3) in such a way that the apex of the liquid ring machine lies in the geodetic upper area of the working chamber, with which liquid ring machine (1) partial working chambers (10, 11) are formed in that on the impeller (4) at least one wall part (8) is provided, which extends over the entire periphery of the impeller (4) from the impeller hub up to the free ends of the blades and, on the machine housing (3) at least one intermediate wall (9) is provided, which is radially aligned with the wall part (8) of the impeller (4), and with which liquid ring machine (1), moreover, a pressure and suction connection piece (20) is provided on each side shield (6), which connection pieces are each in interruptible flow connection with the respective partial working chamber (10 or 11) by way of a control element provided with a suction and pressure slot and, moreover, each partial working chamber (10, 11) in itself can be connected to a liquid-removal device and is provided with a separate operating-liquid supply.
  5. Liquid ring machine (1) according to claim 4 for implementing the method according to claim 2, where at least the suction connection piece (20) arranged on one side of the liquid ring machine (1) is in flow connection on one side of the liquid ring machine (1) additionally by way of an external drainage conduit (22) with a partial working chamber (10 or 11) adjacent to the respective other side.
  6. Liquid ring machine (1) according to claim 5, where the external drainage conduit (22) has a pressure-reduction device.
  7. Liquid ring machine (1) according to one or more of claims 4 to 6 for implementing the method according to claim 2, where at least one partial working chamber (10 or 11) is provided with a connection for a drainage device.
  8. Liquid ring machine (1) according to one or more of claims 4 to 7, where on at least one side, besides the radial forces, the bearing arrangement of the impeller shaft (5) is also able to absorb increased axial forces.
  9. Liquid ring machine (1) according to claim 8, where the impeller shaft (5) is supported in at least one side shield (6) by a dual-action tapered roller bearing.
  10. Liquid ring machine according to one or more of claims 4 to 9 for implementing the method according to claim 1 or 2, where the supply of operating liquid is provided on at least one machine side with a shutoff device.
  11. Liquid ring machine according to one or more of claims 4 to 10, where the shaft seals situated in the side shields (6) are designed to at least restrict any possible entry of atmospheric gas.
  12. Liquid ring machine (1) according to one or more of claims 4 to 11, where the axial impeller subdivision (8) and the intermediate wall (9) are preferably arranged in the middle of the machine.
  13. Liquid ring machine (1) according to one or more of claims 4 to 12, where each partial working chamber (10, 11) has a drainage opening (12) which is suited for draining it completely.
  14. Liquid ring machine (1) according to claim 13, where the drainage opening (12) of at least one partial working chamber (10 or 11) is connected in each case to the operating-liquid supply of at least one other partial working chamber (11 or 10).
  15. Liquid ring machine (1) according to claim 13 for implementing the method according to claim 1 or 3, where the drainage opening (12) of at least one partial working chamber (10 or 11) is connected to the compression area of at least one other partial working chamber (11 or 10).
  16. Liquid ring machine (1) according to claim 13 for implementing the method according to claim 1 or 3, where the drainage opening (12) of at least one partial working chamber (10 or 11) is connected to the intake area of at least one other partial working chamber (11 or 10).
  17. Liquid ring machine (1) according to one or more of claims 14 to 16, where closed ducts are provided for the connection which leads away from the drainage opening(s) (12), which ducts are optionally integrated in the machine housing (3) and/or in the side shield (6), or are arranged so as to be capable of being connected separately outside the machine housing (3).
  18. Liquid ring machine (1) according to one or more of claims 4 to 17 for implementing the method according to claim 2 or 3, where at least a portion of the liquid-removal devices is connected to at least one controllable extraction pump.
  19. Liquid ring machine (1) according to one or more of claims 4 to 18, where the gap (14) between the impeller (4) and the intermediate wall (9) surrounding the impeller (4) is provided with a contact-free seal.
  20. Liquid ring machine (1) according to claim 19, where the edge of the intermediate wall (9) lying radially to the inside is provided with a fastening groove for a Teflon strip, the width of which corresponds more or less to the width of the gap (14) situated between the impeller (4) and the intermediate wall (9).
  21. Liquid ring machine (1) according to one or more of claims 4 to 20 for implementing the method according to claim 1 or 3, where the intermediate wall (9) has a continuous connecting opening (18) in the geodetic lower area.
EP94906852A 1993-02-22 1994-02-09 Liquid ring machine and process for operating it Expired - Lifetime EP0685038B1 (en)

Applications Claiming Priority (3)

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DE4305424A DE4305424A1 (en) 1993-02-22 1993-02-22 Method for operating a liquid ring machine and a liquid ring machine for performing the method
DE4305424 1993-02-22
PCT/DE1994/000131 WO1994019610A1 (en) 1993-02-22 1994-02-09 Liquid ring machine and process for operating it

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EP0685038A1 EP0685038A1 (en) 1995-12-06
EP0685038B1 true EP0685038B1 (en) 1996-08-21

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DE (2) DE4305424A1 (en)
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Also Published As

Publication number Publication date
FI953914A0 (en) 1995-08-21
BR9406197A (en) 1996-02-21
EP0685038A1 (en) 1995-12-06
US5588806A (en) 1996-12-31
DE4305424A1 (en) 1994-08-25
DE59400526D1 (en) 1996-09-26
FI953914A (en) 1995-08-21
WO1994019610A1 (en) 1994-09-01

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