EP0961090A2 - 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
EP0961090A2
EP0961090A2 EP99108910A EP99108910A EP0961090A2 EP 0961090 A2 EP0961090 A2 EP 0961090A2 EP 99108910 A EP99108910 A EP 99108910A EP 99108910 A EP99108910 A EP 99108910A EP 0961090 A2 EP0961090 A2 EP 0961090A2
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EP
European Patent Office
Prior art keywords
compressors
oil
compressor
composite
cold
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.)
Granted
Application number
EP99108910A
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German (de)
French (fr)
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EP0961090B1 (en
EP0961090A3 (en
Inventor
Jürgen Dipl.-Ing. Rüter
Karl Dipl.-Ing. Wüller
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Carrier Kaeltetechnik Deutschland GmbH
Original Assignee
Linde GmbH
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Publication date
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Publication of EP0961090A2 publication Critical patent/EP0961090A2/en
Publication of EP0961090A3 publication Critical patent/EP0961090A3/en
Application granted granted Critical
Publication of EP0961090B1 publication Critical patent/EP0961090B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/02—Lubrication
    • F04B39/0207—Lubrication with lubrication control systems
    • 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
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/27—Problems to be solved characterised by the stop of the refrigeration cycle

Definitions

  • the invention relates to a composite (cold) system with at least two in parallel switched compressors.
  • the invention further relates to a method for operating such a system Composite (cold) system.
  • composite (cold) system is one as described below Composite refrigeration system as well as composite systems that compress any media serve for other purposes.
  • the object of the present invention is a generic Composite (cold) system and a generic method for operating a to specify such a composite (cold) system in which the mentioned Disadvantages are largely avoided.
  • the composite (cold) system according to the invention is characterized in that an oil compensation line is arranged between the compressor housings in such a way that the lower edge of the connections provided on the compressor housings Oil compensation line is above the minimum oil level of the compressor.
  • An embodiment of the composite (cold) system according to the invention is thereby characterized in that in the oil compensation line at least one shut-off device, preferably a valve is arranged.
  • shut-off device in the case of three or more compressors connected in parallel, between a shut-off device can be provided for two compressors; is conceivable, however also, not to provide shut-off devices between all compressors.
  • Compound (cold) system that compresses one level over one between the Compressor housings arranged oil compensation line are interconnected and at least one oil level regulator system or one per level analog functioning system, such as the so-called Traxoil system or the so-called Level switch system, which is an electronic oil return system acts, is provided.
  • the inventive method for operating a composite (cold) system with at least two compressors connected in parallel is characterized in that a The compressor is only switched off when all have at least one Oil compensation line interconnected compressors are in operation, the The compressor is switched off before the minimum permitted oil quantity is within of a compressor is reached.
  • the compressors can also be switched off for the purpose of oil compensation then, if not all of them are connected to one another via at least one oil compensation line connected compressors are in operation.
  • the compressor is switched off In this case, this is not absolutely necessary, as it becomes a problem during operation Oil balance between the compressors in operation and those not in operation is coming.
  • Another method for operating a composite (cold) system with at least two compressors connected in parallel is characterized in that the Operation of only one compressor does not switch off for the purpose of oil compensation he follows.
  • oil compensation is carried out between the individual compressors or between the compressors, between which the shut-off device provided in the oil compensation line is open during the All compressors come to a standstill. During this time it occurs in the oil reservoirs of the parallel connected compressor to a pressure equalization, which leads to that in set the same oil levels in the oil reservoirs.
  • the operating times of the compressors until they are switched off are to be selected that the minimum allowable oil level inside the compressor is due to the oil displacement that does not necessarily occur during compressor operation is undercut.
  • the standstill phases of the compressors must be timed in this way ensure that there is sufficient oil compensation between the compressors can be and a significant impairment of the cold supply by the Compressor of the composite (cold) system according to the invention is avoided.
  • the composite (cold) system according to the invention and the method according to the invention to operate a composite (refrigeration) system require compared to the state of the Technology requires less design effort. This leads to investment and Operating cost savings. Since largely on mechanical use moving components can be dispensed with, the operational safety of Composite (cold) system according to the invention and the method according to the invention increased to operate a composite (cold) system.
  • the invention also enables combining equal and unequal compressors.

Abstract

An oil equalizing line is designed in such a manner, that the lower edge of the connections provided at the compressor housings of the equalizing line, lie above the level of the minimum oil level of the compressor. At least one shutoff organ, a valve is arranged in the oil equalization line.

Description

Die Erfindung betrifft eine Verbund(kälte)anlage mit wenigstens zwei parallel geschalteten Verdichtern.The invention relates to a composite (cold) system with at least two in parallel switched compressors.

Ferner betrifft die Erfindung ein Verfahren zum Betreiben einer derartigen Verbund(kälte)anlage.The invention further relates to a method for operating such a system Composite (cold) system.

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 (cold) system" is one as described below Composite 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 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 the case of composite (refrigeration) systems of the generic type, the system is reliable Oil supply to the compressor, which is in a common (refrigerant) circuit work, is often a problem to ensure reliable operation So far, different oil level control systems, such as for example oil level regulators used. However, these are subject to one Wear and require adjustment work on the oil system in other systems during commissioning.

Aufgabe der vorliegenden Erfindung ist es, eine gattungsgemäße Verbund(kälte)anlage sowie ein gattungsgemäßes Verfahren zum Betreiben einer derartigen Verbund(kälte)anlage anzugeben, bei der bzw. bei dem die erwähnten Nachteile weitestgehend vermieden werden.The object of the present invention is a generic Composite (cold) system and a generic method for operating a to specify such a composite (cold) system in which the mentioned Disadvantages are largely avoided.

Die erfindungsgemäße Verbund(kälte)anlage zeichnet sich dadurch aus, daß zwischen den Verdichtergehäusen eine Ölausgleichsleitung dergestalt angeordnet ist, daß die Unterkante der an den Verdichtergehäusen vorgesehenen Anschlüsse der Ölausgleichsleitung über den Niveaus der Mindestölstände der Verdichter liegt.The composite (cold) system according to the invention is characterized in that an oil compensation line is arranged between the compressor housings in such a way that the lower edge of the connections provided on the compressor housings Oil compensation line is above the minimum oil level of the compressor.

Bisher fanden unter anderem Ölaustausch und Druckausgleich über getrennte Leitungen bzw. sehr groß dimensionierte gemeinsame Öl-/Gasaustauschleitungen statt. Diejenigen Leitungen, die dem Druckausgleich dienen, werden bisher an höher gelegenen Anschlussstutzen der Verdichtergehäuse angeschlossen.So far, among other things, oil exchange and pressure compensation via separate Lines or very large oil / gas exchange lines instead of. Those lines that serve to equalize the pressure have so far been higher connected connecting piece of the compressor housing.

Eine Ausgestaltung der erfindungsgemäßen Verbund(kälte)anlage ist dadurch gekennzeichnet, daß in der Ölausgleichsleitung wenigstens ein Absperrorgan, vorzugsweise ein Ventil, angeordnet ist.An embodiment of the composite (cold) system according to the invention is thereby characterized in that in the oil compensation line at least one shut-off device, preferably a valve is arranged.

Hierbei kann im Falle von drei oder mehr parallel geschalteten Verdichtern zwischen jeweils zwei Verdichtern ein Absperrorgan vorgesehen werden; denkbar ist jedoch auch, nicht zwischen allen Verdichtern Absperrorgane vorzusehen.Here, in the case of three or more compressors connected in parallel, between a shut-off device can be provided for two compressors; is conceivable, however also, not to provide shut-off devices between all compressors.

Bei einer Vielzahl von Verbund(kälte)anlage ist es aus Platzgründen erforderlich, daß die Verdichter auf mehreren Ebenen angeordnet werden. In diesem Fall empfiehlt es sich, entsprechend einer vorteilhaften Ausgestaltung der erfindungsgemäßen Verbund(kälte)anlage, daß die Verdichter einer Ebene über eine zwischen den Verdichtergehäusen angeordnete Ölausgleichsleitung miteinander verbunden sind und pro Ebene wenigstens ein Ölspiegelregulator-System oder ein im wesentlichen analog funktionierendes System, wie bspw. das sog. Traxoil-System oder das sog. Level-Switch-System, bei dem es sich um ein elektronisches Ölrückführsystem handelt, vorgesehen ist.In the case of a large number of composite (cold) systems, it is necessary for the compressors are arranged on several levels. In this case it is recommended themselves, according to an advantageous embodiment of the invention Compound (cold) system that compresses one level over one between the Compressor housings arranged oil compensation line are interconnected and at least one oil level regulator system or one per level analog functioning system, such as the so-called Traxoil system or the so-called Level switch system, which is an electronic oil return system acts, is provided.

Auch bei der Anordnung mehrerer Verdichter in einer Ebene ist es denkbar, die Verdichter zu mehreren sog. Verdichtergruppen zusammenzufassen und den einzelnen Verdichtergruppen jeweils wenigstens ein Ölspiegelregulator-System oder ein im wesentlichen analog funktionierendes System zuzuordnen.It is also conceivable for the arrangement of several compressors in one plane Combine compressors into several so-called compressor groups and the individual compressor groups each have at least one oil level regulator system or assign a system that functions essentially analogously.

Das erfindungsgemäße Verfahren zum Betreiben einer Verbund(kälte)anlage mit wenigstens zwei parallel geschalteten Verdichtern zeichnet sich dadurch aus, daß ein Abschalten der Verdichter nur dann erfolgt, wenn alle über wenigstens eine Ölausgleichsleitung miteinander verbundenen Verdichter in Betrieb sind, wobei das Abschalten der Verdichter erfolgt, bevor die zulässige Mindestölmenge innerhalb eines Verdichters erreicht ist.The inventive method for operating a composite (cold) system with at least two compressors connected in parallel is characterized in that a The compressor is only switched off when all have at least one Oil compensation line interconnected compressors are in operation, the The compressor is switched off before the minimum permitted oil quantity is within of a compressor is reached.

Prinzipiell kann ein Abschalten der Verdichter zum Zwecke des Ölausgleiches auch dann erfolgen, wenn nicht alle über wenigstens eine Ölausgleichsleitung miteinander verbundenen Verdichter in Betrieb sind. Jedoch ist ein Abschalten der Verdichter in diesem Fall nicht zwingend erforderlich, da es bereits während des Betriebs zu einem Ölausgleich zwischen den in Betrieb und den außer Betrieb befindlichen Verdichtern kommt.In principle, the compressors can also be switched off for the purpose of oil compensation then, if not all of them are connected to one another via at least one oil compensation line connected compressors are in operation. However, the compressor is switched off In this case, this is not absolutely necessary, as it becomes a problem during operation Oil balance between the compressors in operation and those not in operation is coming.

Ein weiteres Verfahren zum Betreiben einer Verbund(kälte)anlage mit wenigstens zwei parallel geschalteten Verdichtern ist dadurch gekennzeichnet ist, daß bei dem Betrieb lediglich eines Verdichters ein Abschalten zum Zwecke des Ölausgleichs nicht erfolgt.Another method for operating a composite (cold) system with at least two compressors connected in parallel is characterized in that the Operation of only one compressor does not switch off for the purpose of oil compensation he follows.

Unabhängig von der jeweils gewählten Verfahrensweise erfolgt der Ölausgleich zwischen den einzelnen Verdichtern bzw. zwischen den Verdichtern, zwischen denen das in der Ölausgleichsleitung vorgesehene Absperrorgan geöffnet ist, während der Stillstände aller Verdichter. Während dieser Zeit kommt es in den Ölreservoirs der parallel geschalteten Verdichter zu einem Druckausgleich, der dazu führt, daß sich in den Ölreservoirs gleiche Ölstände einstellen.Regardless of the procedure chosen, oil compensation is carried out between the individual compressors or between the compressors, between which the shut-off device provided in the oil compensation line is open during the All compressors come to a standstill. During this time it occurs in the oil reservoirs of the parallel connected compressor to a pressure equalization, which leads to that in set the same oil levels in the oil reservoirs.

Die Betriebszeiten der Verdichter bis zu ihrem Abschalten sind hierbei so zu wählen, daß der minimal zulässige Ölstand innerhalb der Verdichter aufgrund der zwangsläufig während des Verdichterbetriebes auftretenden Ölverlagerung noch nicht unterschritten wird. Die Stillstandsphasen der Verdichter müssen zeitlich so bemessen sein, daß ein ausreichender Ölausgleich zwischen den Verdichtern gewährleistet werden kann und eine wesentliche Beeinträchtigung der Kälteversorgung durch die Verdichter der erfindungsgemäßen Verbund(kälte)anlage vermieden wird.The operating times of the compressors until they are switched off are to be selected that the minimum allowable oil level inside the compressor is due to the oil displacement that does not necessarily occur during compressor operation is undercut. The standstill phases of the compressors must be timed in this way ensure that there is sufficient oil compensation between the compressors can be and a significant impairment of the cold supply by the Compressor of the composite (cold) system according to the invention is avoided.

Die erfindungsgemäße Verbund(kälte)anlage sowie das erfindungsgemäße Verfahren zum Betreiben einer Verbund(kälte)anlage erfordern gegenüber dem Stand der Technik einen geringeren konstruktiven Aufwand. Dies führt zu Investitions- und Betriebskosteneinsparungen. Da weitestgehend auf die Verwendung mechanisch bewegter Bauteile verzichtet werden kann, wird die Betriebssicherheit der erfindungsgemäßen Verbund(kälte)anlage sowie des erfindungsgemäßen Verfahrens zum Betreiben einer Verbund(kälte)anlage erhöht. Die Erfindung ermöglicht zudem das Kombinieren von gleichen und ungleichen Verdichtern.The composite (cold) system according to the invention and the method according to the invention to operate a composite (refrigeration) system require compared to the state of the Technology requires less design effort. This leads to investment and Operating cost savings. Since largely on mechanical use moving components can be dispensed with, the operational safety of Composite (cold) system according to the invention and the method according to the invention increased to operate a composite (cold) system. The invention also enables combining equal and unequal compressors.

Claims (6)

Verbund(kälte)anlage mit wenigstens zwei parallel geschalteten Verdichtern, dadurch gekennzeichnet, daß zwischen den Verdichtergehäusen eine Ölausgleichsleitung dergestalt angeordnet ist, daß die Unterkante der an den Verdichtergehäusen vorgesehenen Anschlüsse der Ölausgleichsleitung über den Niveaus der Mindestölstände der Verdichter liegt.Composite (cold) system with at least two compressors connected in parallel, characterized in that an oil compensation line is arranged between the compressor housings such that the lower edge of the connections of the oil compensation line provided on the compressor housings lies above the levels of the minimum oil levels of the compressors. Verbund(kälte)anlage nach Anspruch 1, dadurch gekennzeichnet, daß in der Ölausgleichsleitung wenigstens ein Absperrorgan, vorzugsweise ein Ventil, angeordnet ist.Composite (cold) system according to claim 1, characterized in that in the Oil compensation line at least one shut-off device, preferably a valve, is arranged. Verbund(kälte)anlage nach Anspruch 1 oder 2, bei der auf wenigsten zwei Ebenen jeweils wenigstens zwei parallel geschaltete Verdichter angeordnet sind, dadurch gekennzeichnet, daß die Verdichter einer Ebene über eine zwischen den Verdichtergehäusen angeordnete Ölausgleichsleitung miteinander verbunden sind und pro Ebene wenigstens ein Ölspiegelregulator-System oder ein im wesentlichen analog funktionierendes System vorgesehen ist.Composite (cold) system according to claim 1 or 2, in which at least two Planes are arranged at least two compressors connected in parallel, characterized in that the compressors of a level over a between the Compressor housings arranged oil compensation line connected to each other are and per level at least one oil level regulator system or one in essential analog working system is provided. Verbund(kälte)anlage nach einem der vorhergehenden Ansprüche, bei der mehrere parallel geschaltete Verdichter einer Ebene zu wenigstens zwei Verdichtergruppen zusammengefaßt sind, dadurch gekennzeichnet, daß die Verdichter innerhalb einer Verdichtergruppen über eine zwischen den Verdichtergehäusen angeordnete Ölausgleichsleitung miteinander verbunden sind und pro Verdichtergruppe wenigstens ein Ölspiegelregulator-System oder ein im wesentlichen analog funktionierendes System vorgesehen ist. Composite (cold) system according to one of the preceding claims, in which several compressors connected in parallel on one level to at least two Compressor groups are summarized, characterized in that the Compressors within a compressor group over one between the Compressor housings arranged oil compensation line connected to each other are and per compressor group at least one oil level regulator system or an essentially analog system is provided. Verfahren zum Betreiben einer Verbund(kälte)anlage mit wenigstens zwei parallel geschalteten Verdichtern, dadurch gekennzeichnet, daß ein Abschalten der Verdichter nur dann erfolgt, wenn alle über wenigstens eine Ölausgleichsleitung miteinander verbundenen Verdichter in Betrieb sind, wobei das Abschalten der Verdichter erfolgt, bevor die zulässige Mindestölmenge innerhalb eines Verdichters erreicht ist.Method for operating a composite (cold) system with at least two compressors connected in parallel, characterized in that the compressors are only switched off when all the compressors connected to one another via at least one oil compensation line are in operation, the compressors being switched off before the permissible minimum oil quantity within a compressor has been reached. Verfahren zum Betreiben einer Verbund(kälte)anlage mit wenigstens zwei parallel geschalteten Verdichtern, dadurch gekennzeichnet, daß bei dem Betrieb lediglich eines Verdichters ein Abschalten zum Zwecke des Ölausgleichs nicht erfolgt.Method for operating a composite (cold) system with at least two in parallel switched compressors, characterized in that only during operation a compressor is not switched off for the purpose of oil compensation.
EP99108910A 1998-05-26 1999-05-05 Compound refrigerating installation and method for operating a compound refrigerating installation Expired - Lifetime EP0961090B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823525 1998-05-26
DE19823525A DE19823525A1 (en) 1998-05-26 1998-05-26 Composite (cold) system and method for operating a composite (cold) system

Publications (3)

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EP0961090A2 true EP0961090A2 (en) 1999-12-01
EP0961090A3 EP0961090A3 (en) 2000-03-15
EP0961090B1 EP0961090B1 (en) 2004-09-29

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EP99108910A Expired - Lifetime EP0961090B1 (en) 1998-05-26 1999-05-05 Compound refrigerating installation and method for operating a compound refrigerating installation

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EP (1) EP0961090B1 (en)
AT (1) ATE278164T1 (en)
DE (2) DE19823525A1 (en)
ES (1) ES2229578T3 (en)
PT (1) PT961090E (en)

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EP1550832A1 (en) * 2003-12-10 2005-07-06 Linde Kältetechnik GmbH & Co.KG A (compound) refrigeration system and method for operating the (compound) refrigeration system

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Publication number Priority date Publication date Assignee Title
DE10015603A1 (en) 2000-03-29 2001-10-04 Linde Ag Refrigeration system
DE10252083A1 (en) * 2002-11-08 2004-05-27 Linde Ag refrigeration plant

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US3621670A (en) * 1970-01-12 1971-11-23 Vilter Manufacturing Corp Lubricating oil equalizing system
US3633377A (en) * 1969-04-11 1972-01-11 Lester K Quick Refrigeration system oil separator
EP0403239A2 (en) * 1989-06-14 1990-12-19 Hitachi, Ltd. Capacity controllable compressor apparatus
US5209076A (en) * 1992-06-05 1993-05-11 Izon, Inc. Control system for preventing compressor damage in a refrigeration system
EP0597597A2 (en) * 1992-10-15 1994-05-18 Mitsubishi Denki Kabushiki Kaisha Air conditioner
US5327997A (en) * 1993-01-22 1994-07-12 Temprite, Inc. Lubrication management system
EP0607101A1 (en) * 1993-01-14 1994-07-20 Birton A/S A lubrication oil returning system for refrigeration compressors
WO1996021802A1 (en) * 1995-01-11 1996-07-18 A C & R Components, Inc. Electromechanical oil level regulator
WO1997043585A1 (en) * 1996-05-10 1997-11-20 Shaw David N Series connected primary and booster compressors

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Publication number Priority date Publication date Assignee Title
US3633377A (en) * 1969-04-11 1972-01-11 Lester K Quick Refrigeration system oil separator
US3621670A (en) * 1970-01-12 1971-11-23 Vilter Manufacturing Corp Lubricating oil equalizing system
EP0403239A2 (en) * 1989-06-14 1990-12-19 Hitachi, Ltd. Capacity controllable compressor apparatus
US5209076A (en) * 1992-06-05 1993-05-11 Izon, Inc. Control system for preventing compressor damage in a refrigeration system
EP0597597A2 (en) * 1992-10-15 1994-05-18 Mitsubishi Denki Kabushiki Kaisha Air conditioner
EP0607101A1 (en) * 1993-01-14 1994-07-20 Birton A/S A lubrication oil returning system for refrigeration compressors
US5327997A (en) * 1993-01-22 1994-07-12 Temprite, Inc. Lubrication management system
WO1996021802A1 (en) * 1995-01-11 1996-07-18 A C & R Components, Inc. Electromechanical oil level regulator
WO1997043585A1 (en) * 1996-05-10 1997-11-20 Shaw David N Series connected primary and booster compressors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1550832A1 (en) * 2003-12-10 2005-07-06 Linde Kältetechnik GmbH & Co.KG A (compound) refrigeration system and method for operating the (compound) refrigeration system

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Publication number Publication date
EP0961090B1 (en) 2004-09-29
EP0961090A3 (en) 2000-03-15
ATE278164T1 (en) 2004-10-15
PT961090E (en) 2005-02-28
DE59910625D1 (en) 2004-11-04
ES2229578T3 (en) 2005-04-16
DE19823525A1 (en) 1999-12-02

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