EP0961091B1 - Compound refrigerating installation and method for operating a compound refrigerating installation - Google Patents

Compound refrigerating installation and method for operating a compound refrigerating installation Download PDF

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Publication number
EP0961091B1
EP0961091B1 EP99108909A EP99108909A EP0961091B1 EP 0961091 B1 EP0961091 B1 EP 0961091B1 EP 99108909 A EP99108909 A EP 99108909A EP 99108909 A EP99108909 A EP 99108909A EP 0961091 B1 EP0961091 B1 EP 0961091B1
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European Patent Office
Prior art keywords
compressor
pressure
oil
compressors
line
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EP99108909A
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German (de)
French (fr)
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EP0961091A2 (en
EP0961091A3 (en
Inventor
Rolf Dipl.-Ing. Seidel
Karl Dipl.-Ing. Wüller
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Linde GmbH
Carrier Kaeltetechnik Deutschland GmbH
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Linde GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
    • 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
    • F04B41/00—Pumping installations or systems specially adapted for elastic fluids
    • F04B41/06—Combinations of two or more pumps
    • 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
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/02—Surge control
    • F04D27/0269—Surge control by changing flow path between different stages or between a plurality of compressors; load distribution between compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • F25B31/004—Lubrication oil recirculating arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/075—Details of compressors or related parts with parallel compressors

Definitions

  • the invention relates to a method for operating a composite (cold) system at least two compressors operating at different suction pressures, wherein an oil compensation line between the compressor oil sumps of the compressors at least one shut-off device is arranged.
  • EP-A-0 403 239 discloses one plant Compound (refrigeration).
  • composite (refrigeration) system is one as described below Compound refrigeration system as well as composite systems that compress any media serve for other purposes.
  • the object of the present invention is to provide a generic method for Operate such a composite (refrigeration) plant to specify where the mentioned Disadvantages are avoided.
  • the inventive method for operating a composite (cold) system with draws at least two compressors operating at different suction pressures is characterized in that of the compressors between which an oil balance takes place the one (s) with the lower operating pressure is to be switched off (s) continue to operate while the one (s) with the higher operating pressure or is switched off, then via one between the compressor oil sumps the compressor arranged oil compensation line an oil compensation takes place and after oil equalization, an increase in pressure in the compressor that is on involved in oil balancing and at the lowest pressure becomes.
  • Figures 1 to 4 each show a composite (cold) system with two, with different Suction pressures working compressors V1 and V2.
  • Figures 1 and 3 - drawn in dashed lines - are arranged parallel to the compressors V1 and V2 Compressor V1 'and V2' shown. In principle, one or more can be used for each pressure level Compressors connected in parallel are used.
  • Booster In the connection of the compressors V1 and V2 shown in FIGS. 1 and 2 it is a so-called. "Booster” arrangement, while in the Figures 3 and 4 shown interconnection of a so-called “satellite” arrangement speaks.
  • the term “booster” arrangement stems from the fact that the pressure side of the Compressor V2 is connected to the suction side of compressor V1; that too compressing and transportable medium through the compressor V2 Compressor V1 is "pushed in”.
  • Refrigeration systems of this type generally consist of at least two refrigerant circuits, wherein at least one refrigerant circuit of normal cooling and at least a refrigerant circuit is used for freezing. That relaxed with freezing Refrigerant is via line 1 of the suction side of the first compressor stage or the Compressor V2 supplied. In this, the refrigerant is pressurized over Line 3 brought refrigerant relaxed for the purpose of normal cooling compacted.
  • the refrigerant compressed in compressor V2 is fed via line 2 together with the refrigerant introduced via line 3 of the suction side of the 2. Compressor stage or the compressor V1 supplied. In the compressor V1 that is Refrigerant compressed to the final pressure and then again via line 4 fed to the condenser and evaporator.
  • the compressors V1 and V2 are between the compressor oil sumps an oil compensation line 5, in which at least one shut-off device 6 is provided, arranged.
  • the oil compensation line 5 is during normal operation by the Shut-off device 6 closed.
  • Compressor V2 is switched off from time to time and the shut-off device 6, which is preferably a valve open. Now there is a drain of the excess oil from the Oil reservoir of the compressor V1, in which the higher pressure prevails, into the oil reservoir of the compressor V2, which has a lower pressure.
  • FIG. 2 A further possibility of increasing the pressure in the compressor V2 is shown in FIG. 2 shown.
  • a check valve 8 is arranged in line 1.
  • the composite (cold) systems shown in Figures 3 and 4 and procedures to operate a composite (cold) system differ from those in the Figures 1 and 2 shown composite (cold) systems or procedures only characterized in that the refrigerant compressed in the compressor V2, the compressor V2 is supplied via line 11, is not supplied to the compressor V1, but via Line 12 is mixed with the refrigerant compressed in the compressor V1 in line 14 becomes.
  • the refrigerant to be compressed in the compressor V1 is fed to this via line 13 fed.
  • the oil compensation line 15 between the compressor oil sumps Compressor V1 and V2, which can be closed by means of a shut-off element 16, are met same purpose as the oil compensation line 5 shown in Figures 1 and 2.
  • the same applies to the connecting line 19 shown in FIG Shut-off device 20 is provided - it takes over the function of that in FIG. 2 connecting line 9 shown.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Other Air-Conditioning Systems (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

The combination refrigeration plant is designed, so that between the compressor oil sumps of the compressors (V1, V1', V2, V2'), an oil equalization line (5) is arranged, with at least one blocking organ (6).

Description

Die Erfindung betrifft ein Verfahren zum Betreiben einer Verbund(kälte)anlage mit wenigstens zwei, bei unterschiedlichen Saugdrücken arbeitenden Verdichtern, wobei zwischen den Verdichterölsümpfen der Verdichter eine Ölausgleichsleitung mit wenigstens einem Absperrorgan angeordnet ist. EP-A-0 403 239 offenbart eine solche Verbund(kälte)anlage.The invention relates to a method for operating a composite (cold) system at least two compressors operating at different suction pressures, wherein an oil compensation line between the compressor oil sumps of the compressors at least one shut-off device is arranged. EP-A-0 403 239 discloses one plant Compound (refrigeration).

Unter dem Begriff "Verbund(kälte)anlage" sei eine wie im folgenden beschriebene Verbundkälteanlage sowie Verbundanlagen, die der Verdichtung beliebiger Medien für andere Zwecke dienen, zu verstehen.The term "composite (refrigeration) system" is one as described below Compound refrigeration system as well as composite systems that compress any media serve for other purposes.

Bei Verbund(kälte)anlagen der gattungsgemäßen Art stellt die betriebssichere Ölversorgung der Verdichter, die in einem gemeinsamen (Kältemittel)Kreislauf bei unterschiedlichen Saugdrücken arbeiten, oftmals ein Problem dar. Zur Gewährleistung einer betriebssicheren Ölversorgung werden bisher unterschiedliche Ölstandsreguliersysteme, wie beispielsweise Ölspiegelregulatoren, verwendet. Diese unterliegen jedoch einem Verschleiß und erfordern bei anderen Systemen Einstellarbeiten am Ölsystem während der Inbetriebnahme.In composite (refrigeration) systems of the generic type, the Oil supply to the compressors, which are in a common (refrigerant) circuit different suction pressures are often a problem. To guarantee A reliable oil supply has so far been different Oil level control systems, such as oil level regulators, are used. This however, are subject to wear and require other systems Adjustment work on the oil system during commissioning.

Aufgabe der vorliegenden Erfindung ist es, ein gattungsgemäßes Verfahren zum Betreiben einer derartigen Verbund(kälte)anlage anzugeben, bei dem die erwähnten Nachteile vermieden werden. The object of the present invention is to provide a generic method for Operate such a composite (refrigeration) plant to specify where the mentioned Disadvantages are avoided.

Das erfindungsgemäße Verfahren zum Betreiben einer Verbund(kälte)anlage mit wenigstens zwei bei unterschiedlichen Saugdrücken arbeitenden Verdichtem zeichnet sich dadurch aus, daß von den Verdichtern, zwischen denen ein Ölausgleich stattfinden soll, der(die) jenige(n) mit dem niedrigeren Betriebsdruck abgestellt wird (werden), während der(die) jenige(n) mit dem höheren Betriebsdruck weiterbetrieben oder abgeschaltet wird(werden), anschließend über eine zwischen den Verdichterölsümpfen der Verdichter angeordnete Ölausgleichsleitung ein Ölausgleich stattfindet und nach erfolgtem Ölausgleich eine Druckerhöhung in demjenigen Verdichter, der an dem Ölausgleich beteiligt war und in dem der niedrigste Druck herrscht, durchgeführt wird.The inventive method for operating a composite (cold) system with draws at least two compressors operating at different suction pressures is characterized in that of the compressors between which an oil balance takes place the one (s) with the lower operating pressure is to be switched off (s) continue to operate while the one (s) with the higher operating pressure or is switched off, then via one between the compressor oil sumps the compressor arranged oil compensation line an oil compensation takes place and after oil equalization, an increase in pressure in the compressor that is on involved in oil balancing and at the lowest pressure becomes.

Weitere Ausgestaltungen des erfindungsgemäßen Verfahrens sind Gegenstände von Unteransprüchen.Further refinements of the method according to the invention are the subject of Dependent claims.

Das erfindungsgemäße Verfahren zum Betreiben einer Verbund(kälte)anlage sei anhand der in den Figuren 1 bis 4 dargestellten Ausführungsbeispiele näher erläutert.The method according to the invention for operating a composite (cold) system is with reference to the embodiments shown in Figures 1 to 4 explained in more detail.

Die Figuren 1 bis 4 zeigen jeweils eine Verbund(kälte)anlage mit zwei, bei unterschiedlichen Saugdrücken arbeitenden Verdichtern V1 und V2. In den Figuren 1 und 3 sind - gestrichelt gezeichnet - zu den Verdichtern V1 und V2 parallel angeordnete Verdichter V1' und V2' dargestellt. Prinzipiell können je Druckstufe ein oder mehrere parallel geschaltete Verdichter Verwendung finden.Figures 1 to 4 each show a composite (cold) system with two, with different Suction pressures working compressors V1 and V2. In Figures 1 and 3 - drawn in dashed lines - are arranged parallel to the compressors V1 and V2 Compressor V1 'and V2' shown. In principle, one or more can be used for each pressure level Compressors connected in parallel are used.

Bei der in den Figuren 1 und 2 dargestellten Verschaltung der Verdichter V1 und V2 handelt es sich um eine sog. "Booster"-Anordnung, während man bei der in den Figuren 3 und 4 dargestellten Verschaltung von einer sog. "Satelliten"-Anordnung spricht. Der Begriff "Booster"-Anordnung rührt daher, daß die Druckseite des Verdichters V2 mit der Saugseite des Verdichter V1 verbunden ist; das zu verdichtende und zu transportierende Medium durch den Verdichter V2 also in den Verdichter V1 "hineingedrückt" wird.In the connection of the compressors V1 and V2 shown in FIGS. 1 and 2 it is a so-called. "Booster" arrangement, while in the Figures 3 and 4 shown interconnection of a so-called "satellite" arrangement speaks. The term "booster" arrangement stems from the fact that the pressure side of the Compressor V2 is connected to the suction side of compressor V1; that too compressing and transportable medium through the compressor V2 Compressor V1 is "pushed in".

Kälteanlagen dieser Art bestehen im Regelfall aus wenigstens zwei Kältemittelkreisläufen, wobei wenigstens ein Kältemittelkreislauf der Normalkühlung und wenigstens ein Kältemittelkreislauf der Tiefkühlung dient. Das bei der Tiefkühlung entspannte Kältemittel wird über Leitung 1 der Saugseite der ersten Verdichterstufe bzw. dem Verdichter V2 zugeführt. In diesem wird das Kältemittel auf den Druck des über Leitung 3 herangeführten, zum Zwecke der Normalkühlung entspannten Kältemittels verdichtet. Das im Verdichter V2 verdichtete Kältemittel wird über Leitung 2 zusammen mit dem über Leitung 3 herangeführten Kältemittel der Saugseite der 2. Verdichterstufe bzw. des Verdichters V1 zugeführt. In dem Verdichter V1 wird das Kältemittel auf den Enddruck verdichtet und anschließend über Leitung 4 wiederum dem Verflüssiger und Verdampfem zugeführt.Refrigeration systems of this type generally consist of at least two refrigerant circuits, wherein at least one refrigerant circuit of normal cooling and at least a refrigerant circuit is used for freezing. That relaxed with freezing Refrigerant is via line 1 of the suction side of the first compressor stage or the Compressor V2 supplied. In this, the refrigerant is pressurized over Line 3 brought refrigerant relaxed for the purpose of normal cooling compacted. The refrigerant compressed in compressor V2 is fed via line 2 together with the refrigerant introduced via line 3 of the suction side of the 2. Compressor stage or the compressor V1 supplied. In the compressor V1 that is Refrigerant compressed to the final pressure and then again via line 4 fed to the condenser and evaporator.

Erfindungsgemäß ist zwischen den Verdichterölsümpfen der Verdichter V1 und V2 eine Ölausgleichsleitung 5, in der wenigstens ein Absperrorgan 6 vorgesehen ist, angeordnet. Die Ölausgleichsleitung 5 ist während des Normalbetriebes durch das Absperrorgan 6 verschlossen. Von Zeit zu Zeit wird der Verdichter V2 abgeschaltet und das Absperrorgan 6, bei dem es sich vorzugsweise um ein Ventil handelt, wird geöffnet. Nun kommt es zu einem Abfließen des überschüssigen Öls aus dem Ölreservoir des Verdichters V1, in dem der höhere Druck herrscht, in das Ölreservoir des Verdichters V2, der einen niedrigeren Druck aufweist.According to the invention, the compressors V1 and V2 are between the compressor oil sumps an oil compensation line 5, in which at least one shut-off device 6 is provided, arranged. The oil compensation line 5 is during normal operation by the Shut-off device 6 closed. Compressor V2 is switched off from time to time and the shut-off device 6, which is preferably a valve open. Now there is a drain of the excess oil from the Oil reservoir of the compressor V1, in which the higher pressure prevails, into the oil reservoir of the compressor V2, which has a lower pressure.

Nach erfolgter Ölabgabe über die Ölausgleichsleitung 5 muß sichergestellt werden, daß evtl. vorhandenes überschüssiges Öl im Ölreservoir des Verdichters V2 wieder zu dem Verdichter V1 überströmen kann. Dies wird dadurch erreicht, daß im Verdichter V2 eine Druckerhöhung vorgenommen wird. Diese Druckerhöhung kann gemäß einer vorteilhaften Ausgestaltung des erfindungsgemäßen Verfahrens durch Wärmeund/oder Druckzufuhr erfolgen. Der Verdichter V1 kann während der Ölabgabe an den Verdichter V2 weiterbetrieben oder abgeschaltet werden.After the oil has been dispensed via the oil compensation line 5, it must be ensured that that any excess oil in the oil reservoir of the compressor V2 closes again can flow over the compressor V1. This is achieved in that in the compressor V2 a pressure increase is made. According to a advantageous embodiment of the method according to the invention by heat and / or Pressure is supplied. The compressor V1 can be on during the oil discharge the compressor V2 continues to be operated or switched off.

Da in regelmäßigen Abständen ein (elektrisches) Abtauen der Kälteverbraucher erforderlich ist und es während der Abtauphase zu einer Erwärmung des Kältemittels kommt, macht es Sinn, die Stillstandsphase des Verdichters V2 zeitgleich mit diesen Abtauphasen ablaufen zu lassen. Durch das in der Leitung 1 sich erwärmende Kältemittel kommt es sodann im Verdichter V2 zu einer Druckerhöhung, wodurch der Druck im Ölreservoir des Verdichters V2 über den Druck im Ölreservoir des Verdichters V1 ansteigt und so evtl. vorhandenes überschüssiges Öl aus dem Ölreservoir des Verdichters V2 über die Ölausgleichsleitung 5 in das Ölreservoir des Verdichters V1 strömen kann. Vor der erneuten Wiederinbetriebnahme des Verdichters V2 ist das in der Ölausgleichsleitung 5 vorzusehende Absperrorgan 6 wieder zu schließen.Since (cold) defrosting of the refrigeration consumers at regular intervals is required and the refrigerant heats up during the defrost phase comes, it makes sense, the standstill phase of the compressor V2 at the same time To let defrosting take place. Because of the heating in line 1 Refrigerant then comes to a pressure increase in the compressor V2, causing the Pressure in the oil reservoir of the compressor V2 above the pressure in the oil reservoir of the Compressor V1 rises and so any excess oil from the Oil reservoir of the compressor V2 via the oil compensation line 5 in the oil reservoir of the Compressor V1 can flow. Before restarting the Compressor V2 is the shut-off device 6 to be provided in the oil compensation line 5 close again.

Eine weitere Möglichkeit der Druckerhöhung im Verdichter V2 ist in der Figur 2 dargestellt. Bei der in der Figur 2 dargestellten Verfahrensweise ist die Druckseite des Verdichters V1 über eine Verbindungsleitung 9, in der wiederum wenigstens ein Absperrorgan 10 angeordnet ist, saugseitig mit dem Verdichter V2 verbunden. Zusätzlich ist in der Leitung 1 ein Rückschlagventil 8 angeordnet.A further possibility of increasing the pressure in the compressor V2 is shown in FIG. 2 shown. In the procedure shown in Figure 2, the pressure side of the Compressor V1 via a connecting line 9, in turn at least one Shut-off device 10 is arranged, connected on the suction side to the compressor V2. In addition, a check valve 8 is arranged in line 1.

Nach erfolgtem Ölausgleich zwischen den Verdichterölsümpfen der Verdichter V1 und V2 über die Ölausgleichsleitung 5 erfolgt bei geöffneter Leitung 9 mittels des Verdichters V1 ein Druckaufbau im Verdichter V2. Dieser Druckaufbau hat ein Überströmen von evtl. vorhandenem überschüssigen Öl aus dem Ölreservoir des Verdichters V2 über die Ölausgleichsleitung 5 in das Ölreservoir des Verdichters V1 zur Folge. Vor der erneuten Wiederinbetriebnahme des Verdichters V2 sind bei dieser Verfahrensweise die in der Ölausgleichsleitung 5 sowie der Verbindungsleitung 9 vorzusehenden Absperrorgan 6 bzw. 10 zu schließen.After oil equalization between the compressor oil sumps of compressors V1 and V2 via the oil compensation line 5 takes place with the line 9 open by means of the Compressor V1 builds up pressure in compressor V2. This pressure build-up has one Overflow of any excess oil from the oil reservoir of the Compressor V2 via the oil compensation line 5 into the oil reservoir of the compressor V1 result. Before the compressor V2 is started up again, The procedure in the oil compensation line 5 and the connecting line 9 shut-off device 6 or 10 to be provided.

Die in den Figuren 3 und 4 dargestellte Verbund(kälte)anlagen sowie Verfahrensweisen zum Betreiben einer Verbund(kälte)anlage unterscheiden sich von den in den Figuren 1 und 2 dargestellten Verbund(kälte)anlagen bzw. Verfahrensweisen lediglich dadurch, daß das im Verdichter V2 verdichtete Kältemittel, das dem Verdichter V2 über Leitung 11 zugeführt wird, nicht dem Verdichter V1 zugeführt wird, sondern über Leitung 12 dem im Verdichter V1 verdichteten Kältemittel in Leitung 14 zugemischt wird. Das im Verdichter V1 zu verdichtende Kältemittel wird diesem über Leitung 13 zugeführt. Die Ölausgleichsleitung 15 zwischen den Verdichterölsümpfen der Verdichter V1 und V2, die mittels eines Absperrorgans 16 verschließbar ist, erfüllt denselben Zweck, wie die in den Figuren 1 und 2 dargestellte Ölausgleichsleitung 5. Gleiches gilt für die in der Figur 4 dargestellte Verbindungsleitung 19, in der ein Absperrorgan 20 vorgesehen ist, - sie übernimmt die Funktion der in der Figur 2 gezeigten Verbindungsleitung 9.The composite (cold) systems shown in Figures 3 and 4 and procedures to operate a composite (cold) system differ from those in the Figures 1 and 2 shown composite (cold) systems or procedures only characterized in that the refrigerant compressed in the compressor V2, the compressor V2 is supplied via line 11, is not supplied to the compressor V1, but via Line 12 is mixed with the refrigerant compressed in the compressor V1 in line 14 becomes. The refrigerant to be compressed in the compressor V1 is fed to this via line 13 fed. The oil compensation line 15 between the compressor oil sumps Compressor V1 and V2, which can be closed by means of a shut-off element 16, are met same purpose as the oil compensation line 5 shown in Figures 1 and 2. The same applies to the connecting line 19 shown in FIG Shut-off device 20 is provided - it takes over the function of that in FIG. 2 connecting line 9 shown.

Bei dem erfindungsgemäßen Verfahren zum Betreiben einer derartigen Verbund(kälte)anlage kann auf die Verwendung vergleichsweise teurer Ölspiegelregulatorsysteme verzichtet werden. Aufgrund des Entfalls mechanisch bewegter Teile, wie sie bei Ölspiegelregulatorsystemen vorhanden sind, läßt sich eine höhere Betriebssicherheit realisieren. Der erforderliche zusätzliche konstruktive Aufwand ist dabei vergleichsweise gering. Die Erfindung ermöglicht zudem das Kombinieren von gleichen und ungleichen Verdichtern.In the inventive method for operating such Compound (cold) system can be on the Comparatively expensive oil level regulator systems can be dispensed with. Due to the elimination of mechanically moving parts, such as those found in oil level regulator systems are present, higher operational reliability can be achieved. The the additional design effort required is comparatively low. The The invention also enables the combination of the same and the unequal Compressors.

Claims (4)

  1. Method for operating a compound installation or compound refrigerating installation having at least two compressors which operate different suction pressures, an oil compensation line with at least one shot-off member being arranged between the compressor oil sumps of the compressors, characterized in that of the compressors between which oil compensation is to take place, the compressor(s) at the lower operating pressure is(are) shot down, while the compressor(s) at the higher operating pressure is(are) operated further or switched off, then oil compensation takes place via an oil compensation line (5, 15) arranged between the compressor oil sumps of the compressors (V1, V1', V2, V2'), and after oil compensation has taken place, the pressure is increased in the compressor which was involved in the oil compensation and in which the lowest pressure prevails.
  2. Method according to Claim 1, characterized in that the increase in pressure in the compressor which was involved in the oil compensation and in which the lowest pressure prevails is effected by the supply of heat and/or pressure.
  3. Method according to Claim 1 or 2, in which at least the pressure side of the compressor which has the highest compression pressure is connected to the suction side of the compressor which has the lowest compression pressure via at least one connecting line in which at least one shot-off member is arranged, characterized in that the pressure increase is effected via at least one connecting line (9, 19) which connects the pressure side of the compressor (V1, V1') which has the highest compression pressure to the suction side of the compressor (V2, V2') which has the lowest compression pressure.
  4. Method according to one of Claims 1 to 3, characterized in that the pressure increase is effected by heating the medium which is delivered by means of the compressor (V2, V2').
EP99108909A 1998-05-26 1999-05-05 Compound refrigerating installation and method for operating a compound refrigerating installation Expired - Lifetime EP0961091B1 (en)

Applications Claiming Priority (2)

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DE19823524A DE19823524A1 (en) 1998-05-26 1998-05-26 Composite (cold) system and method for operating a composite (cold) system
DE19823524 1998-05-26

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EP0961091A2 EP0961091A2 (en) 1999-12-01
EP0961091A3 EP0961091A3 (en) 2000-03-15
EP0961091B1 true EP0961091B1 (en) 2003-12-03

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EP99108909A Expired - Lifetime EP0961091B1 (en) 1998-05-26 1999-05-05 Compound refrigerating installation and method for operating a compound refrigerating installation

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EP (1) EP0961091B1 (en)
AT (1) ATE255716T1 (en)
DE (2) DE19823524A1 (en)
ES (1) ES2212415T4 (en)
PT (1) PT961091E (en)

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* Cited by examiner, † Cited by third party
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DE10015603A1 (en) * 2000-03-29 2001-10-04 Linde Ag Refrigeration system
DE10252083A1 (en) * 2002-11-08 2004-05-27 Linde Ag refrigeration plant
EP1886077A1 (en) * 2005-05-30 2008-02-13 Johnson Controls Denmark ApS Oil separation in a cooling circuit
FR2920839B1 (en) * 2007-09-07 2013-11-22 Electricite De France METHOD AND DEVICE FOR BALANCING OIL BETWEEN COMPRESSORS
ES2600474T3 (en) * 2009-02-19 2017-02-09 Systemair Ac S.A.S Thermodynamic installation with improved lubrication
WO2012095186A1 (en) * 2011-01-14 2012-07-19 Carrier Corporation Refrigeration system and method for operating a refrigeration system
DE102013014543A1 (en) * 2013-09-03 2015-03-05 Stiebel Eltron Gmbh & Co. Kg heat pump device

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DE2844664A1 (en) * 1978-10-13 1980-04-24 Volkswagenwerk Ag INTERNAL COMBUSTION HEAT PUMP
US4383802A (en) * 1981-07-06 1983-05-17 Dunham-Bush, Inc. Oil equalization system for parallel connected compressors
IT1144762B (en) * 1981-09-07 1986-10-29 Aspera Spa HERMETIC MOTOR-COMPRESSOR FOR REFRIGERATING SYSTEMS AND SIMILAR
US4529061A (en) * 1984-01-23 1985-07-16 Deere & Company Fluid level control system
JP2865707B2 (en) * 1989-06-14 1999-03-08 株式会社日立製作所 Refrigeration equipment
DK4093A (en) * 1993-01-14 1994-09-12 Birton As Installations for the return of lubricating oil in refrigeration compressors
JP4013261B2 (en) * 1994-06-29 2007-11-28 ダイキン工業株式会社 Refrigeration equipment
AU7322596A (en) * 1995-11-02 1997-05-22 Aaf-Mcquay Incorporated Improvements in and relating to single screw compressors
EP0883784A1 (en) * 1996-02-27 1998-12-16 David N. Shaw Boosted air source heat pump

Also Published As

Publication number Publication date
ES2212415T4 (en) 2004-09-16
EP0961091A2 (en) 1999-12-01
EP0961091A3 (en) 2000-03-15
ES2212415T3 (en) 2004-07-16
DE19823524A1 (en) 1999-12-02
DE59907913D1 (en) 2004-01-15
ATE255716T1 (en) 2003-12-15
PT961091E (en) 2004-04-30

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