EP2034258A1 - Device and method for balancing oil between compressors - Google Patents

Device and method for balancing oil between compressors Download PDF

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Publication number
EP2034258A1
EP2034258A1 EP08163878A EP08163878A EP2034258A1 EP 2034258 A1 EP2034258 A1 EP 2034258A1 EP 08163878 A EP08163878 A EP 08163878A EP 08163878 A EP08163878 A EP 08163878A EP 2034258 A1 EP2034258 A1 EP 2034258A1
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EP
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Prior art keywords
compressor
valve
oil
pressure compressor
compressors
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EP08163878A
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German (de)
French (fr)
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EP2034258B1 (en
Inventor
Jean-Benoît Ritz
Michel Coevoet
Bernard Horber
Sami Barbouchi
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Electricite de France SA
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Electricite de France SA
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    • 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
    • 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

Definitions

  • the invention relates to a device comprising a thermodynamic circuit. More specifically, the invention relates to a device and a method for balancing oil between compressors.
  • Thermodynamic circuits used to transfer thermal energy from a hot point to a cold point using heat transfer fluids, use most of the time at least one compressor for a compression phase of heat transfer fluids.
  • a compressor includes moving mechanical elements that require the use of a lubricating oil to prevent frictional deterioration between moving mechanical parts. Generally, the oil in a compressor is not separated from the coolant; we will therefore designate, in the document, "crankcase" a part of the compressor where the oil is retained.
  • thermodynamic circuit includes only one compressor, the oil that has escaped from the compressor during delivery of the coolant, is carried along with the fluid, performs a complete cycle, returns to the compressor inlet and reinstate this one.
  • thermodynamic circuit is correctly designed to promote the transport of the oil in the coolant, it is easy in practice to reach a balance between an oil flow discharged by the discharge of the compressor and a flow of return oil from the thermodynamic circuit.
  • thermodynamic circuits using series-connected compressors the existing oil balancing systems are based on tubular links connecting the compressor housings, equipped with controlled or controlled opening valves so as not to put in permanent direct communication the crankcase compressors that operate at different pressures.
  • the patent US 3,500,962 describes a system comprising a central tank, storing a reserve of oil, which feeds by means of a pump the casings of different compressors. But this system includes a large number of control valves, as well as the presence of level sensors in the compressors that make this realization, for example, much too expensive for the thermodynamic circuits used for heat pumps, reversible or not, intended to the residential or tertiary sector.
  • An object of the invention is to provide a device and a method for improving the oil balance between different compressors.
  • thermodynamic device comprising a low pressure compressor (LP) connected in series with a high pressure compressor (HP) by means of a serial link (that is to say that the inlet of the high pressure compressor is connected to the output of the low pressure compressor via the serial link); each compressor comprising a housing for retaining oil, and a tube connecting the compressor housings, the tube comprising a first controlled valve; the device also comprising a second controlled valve for balancing the internal pressures of the compressors, once the compressor stoppage obtained.
  • LP low pressure compressor
  • HP high pressure compressor
  • a thermodynamic device comprises a compressor 1 called “low pressure” (which we will call “BP” later), comprising an inlet 11 and an outlet 12, respectively for the admission and the discharge of a heat transfer fluid, and a compressor 2 called “high pressure” (which we will call “HP” later), comprising an inlet 21 and an outlet 22, respectively for the admission and discharge of the heat transfer fluid.
  • Both compressors are connected in series using a serial link B (that is, the input of the HP compressor is connected to the output of the LP compressor via the serial link B).
  • the coolant which comes from an evaporator (not shown), is "sucked" by the compressor BP, undergoes a first compression step, then it is sucked by the HP compressor via the serial link B to undergo a second compression stage to finally be discharged to a condenser (not shown).
  • Each of the compressors comprises a housing, respectively 5 and 6, for retaining the oil.
  • the device comprises a tube 3 connecting the casings 5 and 6 of the compressors 1 and 2, the tube 3 comprising a controlled valve 4.
  • the device also comprises a second tube 8 in parallel (term “in parallel” contrary to the term “en series ") of the tube 3, the second tube 8 being provided with a controlled valve 9.
  • the second tube 8 is connected, at the levels of the casings 5 and 6 to a level greater than a desired maximum level of the oil of a casing (the second tube 8 is not in contact with the oil contained in the casings).
  • the LP compressor can gradually fill with oil while the HP compressor is empty of oil, according to a phenomenon described above.
  • the internal pressure of the HP compressor is higher than the internal pressure of the LP compressor.
  • the simple opening of the valve 4 is not enough to balance the oil in the crankcase because the higher pressure in the HP compressor prevents a transfer of oil from the HP crankcase to the BP crankcase.
  • the opening of the valve 9 has the effect of balancing the internal pressures of the compressors 1 and 2 by transferring the heat transfer fluid from the compressor HP 2 to the compressor BP 1 via the tube 8.
  • the valve 4 of the tube 3 is opened. This results in a balancing of oil levels by gravity (the internal pressures have been balanced). Thus, an oil transfer is effected from the housing BP 5 to the housing HP 6. According to the invention, it is also intended to connect the tube 3, at the housings, to a level greater than a nominal level. of oil, thus preventing the oil level from falling below this nominal level during the oil balance.
  • the device includes a bypass link A for the LP compressor.
  • a bypass link is a link that connects the input of a compressor to the output of the same compressor, thereby bypassing the compressor on the thermodynamic circuit.
  • the bypass connection A thus connects the inlet 11 to the outlet 12 of the compressor BP 1.
  • the link A also comprises a nonreturn valve 10 which prevents, during the operation of the compressor BP, that the fluid leaving the compressor returns via the bypass link A, to the inlet of the LP compressor.
  • the valve 10 is non-conducting.
  • this bypass is to allow the HP 2 compressor to run on its own. Indeed if the BP compressor is off, the HP compressor, which continues to operate, "sucks" the heat transfer fluid through its inlet 21 thus creating a vacuum in the serial link B and on the link A (so at the output 102 10), this depression causes the opening of the non-return valve 10 and consequently the circulation of the heat transfer fluid via the link A, thus allowing the HP compressor to operate alone.
  • the HP compressor also includes a bypass connection and a check valve (not shown).
  • the controlled valve 9 is then located on the bypass connection A, in parallel (term "in parallel” contrary to the term “in series") of the non-return valve 10.
  • the valve 9 is normally closed when using the compressors.
  • the opening of the valve 9 causes a balancing between the input 11 of the compressor 1 and the inlet 21 of the compressor 2, and consequently, causes a balancing between the internal pressure of the compressor BP 1 and the internal pressure of the compressor HP 2.
  • the nonreturn valve 10 can be removed. Indeed, the anti-return function is then provided by the valve 9 keeping it normally closed when using the compressors. If use of the HP compressor alone is desired, then just open the valve 9.
  • valve 9 it is necessary to provide a relatively robust valve (and therefore more expensive) to support, alone, the passage of heat transfer fluid when using the HP compressor alone. Indeed, in the other embodiments described, the function of the valve 9 is simply to balance the pressures (the balancing is generally performed in a relatively short time), it is not necessary that the valve 9 is a high robustness (and therefore may be of a lower cost).
  • valve 9 can be located anywhere in the thermodynamic circuit provided that it is connected by one of its sides to the internal pressure of the compressor BP (for example via the inlet 11), and on the other side, the internal pressure of the HP compressor.
  • an opening of the valve 9 causes a short-circuiting of the LP compressor by bringing the inlet pressure of the HP compressor to the inlet pressure of the LP compressor.
  • valve 7 can be placed anywhere in the thermodynamic circuit provided that its closure prevents the circulation of heat transfer fluid to the HP compressor.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

The device has a low pressure compressor (1) mounted in series with a high pressure compressor (2) through a series connection (B). Each compressor respectively comprises cases (5, 6) for retaining oil. A tube (3) connects the cases of the compressors and comprises a control valve (9) to perform balancing between internal pressure of the low pressure compressor and internal pressure of the high-pressure compressor. An independent claim is also included for a method for performing rapid balancing of oil i.e. lubricating oil, between a high pressure compressor and a lower pressure compressor in a thermodynamic device.

Description

L'invention concerne un dispositif comprenant un circuit thermodynamique. Plus précisément, l'invention concerne un dispositif et un procédé d'équilibrage d'huile entre compresseurs.The invention relates to a device comprising a thermodynamic circuit. More specifically, the invention relates to a device and a method for balancing oil between compressors.

Les circuits thermodynamiques, utilisés pour transférer de l'énergie thermique d'un point chaud à un point froid à l'aide de fluides caloporteurs, utilisent la plupart du temps au moins un compresseur pour une phase de compression des fluides caloporteurs. Un compresseur comprend des éléments mécaniques en mouvement qui obligent l'utilisation d'une huile de lubrification afin d'éviter la détérioration par frottement entre les pièces mécaniques en mouvement. Généralement, l'huile dans un compresseur, n'est pas séparée du fluide caloporteur ; nous désignerons donc, dans le document, par « carter » une partie du compresseur où l'huile est retenue.Thermodynamic circuits, used to transfer thermal energy from a hot point to a cold point using heat transfer fluids, use most of the time at least one compressor for a compression phase of heat transfer fluids. A compressor includes moving mechanical elements that require the use of a lubricating oil to prevent frictional deterioration between moving mechanical parts. Generally, the oil in a compressor is not separated from the coolant; we will therefore designate, in the document, "crankcase" a part of the compressor where the oil is retained.

Lors d'un fonctionnement d'un compresseur, une partie de cette huile s'échappe du compresseur et est emportée par le fluide caloporteur. Lorsqu'un circuit thermodynamique ne comprend qu'un seul compresseur, l'huile qui s'est échappée du compresseur lors d'un refoulement du fluide caloporteur, est emportée avec le fluide, effectue un cycle complet, revient à l'entrée du compresseur et réintègre celui-ci. Ainsi, si le circuit thermodynamique est correctement conçu pour favoriser le transport de l'huile dans le fluide caloporteur, il est facile en pratique d'arriver à un équilibre entre un débit d'huile évacué par le refoulement du compresseur et un débit d'huile de retour du circuit thermodynamique.During operation of a compressor, a portion of this oil escapes from the compressor and is carried away by the coolant. When a thermodynamic circuit includes only one compressor, the oil that has escaped from the compressor during delivery of the coolant, is carried along with the fluid, performs a complete cycle, returns to the compressor inlet and reinstate this one. Thus, if the thermodynamic circuit is correctly designed to promote the transport of the oil in the coolant, it is easy in practice to reach a balance between an oil flow discharged by the discharge of the compressor and a flow of return oil from the thermodynamic circuit.

Cependant, lorsque plusieurs compresseurs sont montés en série, il arrive qu'un des compresseurs se vide de l'huile, et que celle-ci aille s'accumuler dans un carter d'un autre compresseur, ce qui peut aboutir à une détérioration du compresseur dont un niveau d'huile est descendu en dessous d'un seuil critique de fonctionnement.However, when several compressors are mounted in series, it happens that one of the compressors empties the oil, and that it goes to accumulate in a crankcase of another compressor, which can lead to a deterioration of compressor whose oil level has dropped below a critical operating threshold.

Pour pouvoir rééquilibrer les niveaux d'huile, il existe plusieurs moyens. Dans des circuits thermodynamiques utilisant des compresseurs montés en série, les systèmes d'équilibrage d'huile existants sont basés sur des liaisons tubulaires reliant les carters des compresseurs, munies de valves à ouverture commandée ou régulée afin de ne pas mettre en communication directe permanente les carters des compresseurs qui fonctionnent à des pressions différentes.In order to rebalance the oil levels, there are several ways. In thermodynamic circuits using series-connected compressors, the existing oil balancing systems are based on tubular links connecting the compressor housings, equipped with controlled or controlled opening valves so as not to put in permanent direct communication the crankcase compressors that operate at different pressures.

Par exemple, le brevet US 3,500,962 décrit un système comprenant une cuve centrale, stockant une réserve d'huile, qui alimente par le biais d'une pompe les carters de différents compresseurs. Mais ce système comprend un nombre important de vannes de régulation, ainsi que la présence de capteurs de niveau dans les compresseurs qui rendent cette réalisation, par exemple, beaucoup trop coûteuse pour les circuits thermodynamiques utilisés pour les pompes à chaleur, réversibles ou non, destinés au secteur résidentiel ou tertiaire.For example, the patent US 3,500,962 describes a system comprising a central tank, storing a reserve of oil, which feeds by means of a pump the casings of different compressors. But this system includes a large number of control valves, as well as the presence of level sensors in the compressors that make this realization, for example, much too expensive for the thermodynamic circuits used for heat pumps, reversible or not, intended to the residential or tertiary sector.

Ainsi, d'autres systèmes plus simples ont été présentés pour des compresseurs en série. Un tel système est décrit dans le document WO 2006/041682 A1 , où il est prévu un compresseur basse pression « BP » et un compresseur haute pression « HP », chacun des compresseurs comprenant un carter, les deux carters étant reliés par un tube muni d'un clapet anti-retour normalement fermé. Lors de l'utilisation, le compresseur BP (ou le compresseur HP) se remplit progressivement d'huile tandis que le compresseur HP (ou le compresseur BP) se vide d'huile, à des vitesses plus ou moins rapides. Le document prévoit, alors un équilibrage des niveaux d'huile, une fois l'arrêt des compresseurs obtenu. En effet, une fois les deux compresseurs à l'arrêt, la pression au sein du compresseur HP est supérieure à la pression au sein du compresseur BP. Ainsi une fois que le clapet anti-retour du tube reliant les deux carters est ouvert, la différence de pression « pousse » l'huile du carter HP vers le carter BP. Cependant, si pendant le fonctionnement des compresseurs, c'est le compresseur BP qui se remplit d'huile, alors il n'est pas possible de rééquilibrer le niveau d'huile à cause de cette différence de pression.Thus, other, simpler systems have been introduced for series compressors. Such a system is described in the document WO 2006/041682 A1 , where there is provided a low pressure compressor "BP" and a high pressure compressor "HP", each compressor comprising a housing, the two housings being connected by a tube provided with a normally closed non-return valve. In use, the LP compressor (or the HP compressor) gradually fills with oil while the HP compressor (or the LP compressor) runs out of oil, at more or less rapid speeds. The document provides, then a balancing of the oil levels, once the compressor stoppage obtained. Indeed, once both compressors are stopped, the pressure within the HP compressor is greater than the pressure within the compressor BP. Thus, once the check valve of the tube connecting the two housings is open, the pressure difference "pushes" the oil from the HP housing to the BP housing. However, if during operation of the compressors, it is the BP compressor that fills with oil, then it is not possible to rebalance the oil level because of this pressure difference.

Un but de l'invention est de proposer un dispositif et un procédé permettant d'améliorer l'équilibrage d'huile entre différents compresseurs.An object of the invention is to provide a device and a method for improving the oil balance between different compressors.

A cet effet, il est prévu, selon l'invention, un dispositif thermodynamique comprenant un compresseur basse pression (BP) monté en série avec un compresseur haute pression (HP) à l'aide d'une liaison série (c'est à dire que l'entrée du compresseur haute pression est connectée à la sortie du compresseur basse pression par l'intermédiaire de la liaison série); chaque compresseur comprenant un carter pour la retenue d'huile, et un tube reliant les carters des compresseurs, le tube comprenant une première vanne commandée ; le dispositif comprenant également une deuxième vanne commandée destinée à équilibrer les pressions internes des compresseurs, une fois l'arrêt des compresseurs obtenu.For this purpose, there is provided, according to the invention, a thermodynamic device comprising a low pressure compressor (LP) connected in series with a high pressure compressor (HP) by means of a serial link (that is to say that the inlet of the high pressure compressor is connected to the output of the low pressure compressor via the serial link); each compressor comprising a housing for retaining oil, and a tube connecting the compressor housings, the tube comprising a first controlled valve; the device also comprising a second controlled valve for balancing the internal pressures of the compressors, once the compressor stoppage obtained.

Ainsi, une fois que l'équilibrage entre les pressions internes des compresseurs haute et basse pression est effectué, il est prévu d'ouvrir la vanne située sur le tube reliant les deux carters ; permettant ainsi un équilibrage de l'huile (via le tube reliant les carters) par simple gravité.Thus, once the balancing between the internal pressures of the high and low pressure compressors is performed, it is planned to open the valve located on the tube connecting the two housings; thus allowing a balancing of the oil (via the tube connecting the housings) by simple gravity.

Avantageusement mais facultativement, le dispositif comporte au moins l'une des caractéristiques suivantes :

  • La deuxième vanne est connectée par un de ses cotés au niveau de la pression interne du compresseur basse pression et par l'autre coté au niveau de la pression interne du compresseur haute pression.
  • La deuxième vanne est située sur un deuxième tube reliant les carters entre eux, en parallèle du premier tube et étant connecté à un niveau supérieur à un niveau maximum voulu de l'huile d'un carter.
  • La deuxième vanne est située sur une liaison de contournement du compresseur basse pression.
  • La deuxième vanne est située en parallèle d'un clapet anti-retour de la liaison de contournement du compresseur basse pression.
  • Le dispositif comprend une troisième vanne destinée à empêcher une circulation d'un fluide caloporteur vers le compresseur haute pression.
  • La troisième vanne est située sur la liaison série.
  • Le premier tube est connecté à un niveau supérieur à un niveau d'huile nominal.
  • L'invention prévoit également un procédé pour un équilibrage rapide d'huile entre compresseurs dans un dispositif selon l'une des revendications précédentes, comprenant les étapes suivantes :
    • o arrêter les compresseurs,
    • o une fois les compresseurs à l'arrêt, ouvrir la deuxième vanne,
    • o une fois l'équilibre entre la pression interne du compresseur basse pression et la pression interne du compresseur haute pression atteint, ouvrir la première vanne.
  • Le procédé d'équilibrage comprend en outre les étapes suivantes :
    • o fermer la deuxième vanne sauf dans le cas où la deuxième vanne remplie également la fonction anti-retour de la liaison de contournement,
    • o démarrer le compresseur haute pression,
    • o fermer la troisième vanne,
    • o une fois le compresseur haute pression démarré, ouvrir la première vanne.
Advantageously but optionally, the device comprises at least one of the following characteristics:
  • The second valve is connected by one of its sides to the internal pressure of the low pressure compressor and the other side to the internal pressure of the high pressure compressor.
  • The second valve is located on a second tube connecting the housings together, in parallel with the first tube and connected to a level above a desired maximum level of the oil of a housing.
  • The second valve is located on a bypass connection of the low pressure compressor.
  • The second valve is located in parallel with a non-return valve of the bypass connection of the low pressure compressor.
  • The device includes a third valve for preventing a heat transfer fluid from circulating to the high pressure compressor.
  • The third valve is located on the serial link.
  • The first tube is connected to a level above a nominal oil level.
  • The invention also provides a method for rapid balancing of oil between compressors in a device according to one of the preceding claims, comprising the following steps:
    • o stop the compressors,
    • o once the compressors are stopped, open the second valve,
    • o Once the balance between the internal pressure of the low pressure compressor and the internal pressure of the high pressure compressor has been reached, open the first valve.
  • The balancing method further comprises the following steps:
    • o close the second valve except in the case where the second valve also fulfills the anti-return function of the bypass connection,
    • o start the high pressure compressor,
    • o close the third valve,
    • o once the high pressure compressor has started, open the first valve.

D'autres caractéristiques, buts et avantages de la présente invention apparaîtront à la lecture de la description détaillée qui va suivre, au regard des dessins annexés, donnés à titre d'exemples non limitatifs et sur lesquels:

  • La figure 1 présente un schéma d'un dispositif thermodynamique selon l'invention,
  • La figure 2 présente un schéma d'une variante de réalisation du dispositif selon l'invention,
  • La figure 3 présente un schéma d'une autre variante de réalisation du dispositif selon l'invention,
  • La figure 4 présente un schéma d'une autre variante de réalisation du dispositif selon l'invention.
Other features, objects and advantages of the present invention will appear on reading the detailed description which follows, with reference to the appended drawings, given as non-limiting examples and in which:
  • The figure 1 presents a diagram of a thermodynamic device according to the invention,
  • The figure 2 shows a diagram of an alternative embodiment of the device according to the invention,
  • The figure 3 shows a diagram of another variant embodiment of the device according to the invention,
  • The figure 4 shows a diagram of another alternative embodiment of the device according to the invention.

Dans la suite du document, nous entendrons par l'action d'ouverture d'une vanne, le fait de rendre cette vanne passante au sens où elle n'empêche pas une circulation d'un fluide. A contrario, nous entendrons par l'action de fermeture d'une vanne, le fait de la rendre non passante dans le sens où elle empêche la circulation d'un fluide.In the rest of the document, we will hear by the action of opening a valve, making this valve pass in the sense that it does not prevent a flow of a fluid. On the other hand, we mean by the action of closing a valve, making it non-conducting in the sense that it prevents the circulation of a fluid.

Nous définissons également quatre états possibles pour un compresseur :

  • Un état « en fonctionnement », signifiant que le compresseur se trouve en un état statique de fonctionnement.
  • Un état « à l'arrêt », signifiant que le compresseur se trouve dans un état statique dans lequel il est complètement arrêté.
  • Un état « en démarrage », signifiant que le compresseur se trouve dans un état dynamique transitoire d'un état « à l'arrêt » vers un état « en fonctionnement »
  • Un état « en phase d'arrêt », signifiant que le compresseur se trouve dans un état dynamique transitoire d'un état « en fonctionnement » vers un état « à l'arrêt ».
We also define four possible states for a compressor:
  • An "operating" state, meaning that the compressor is in a static state of operation.
  • A "stopped" state, meaning that the compressor is in a static state in which it is completely stopped.
  • A "start-up" state, meaning that the compressor is in a transient dynamic state from a "stopped" state to a "in operation" state
  • A "stopped state", meaning that the compressor is in a transient dynamic state from an "in operation" state to a "stopped" state.

En référence à la figure 1, un dispositif thermodynamique selon l'invention, comprend un compresseur 1 appelé « basse pression » (que nous dénommerons par la suite « BP »), comprenant une entrée 11 et une sortie 12, respectivement pour l'admission et le refoulement d'un fluide caloporteur, et un compresseur 2 appelé « haute pression » (que nous dénommerons par la suite « HP »), comprenant une entrée 21 et une sortie 22, respectivement pour l'admission et le refoulement du fluide caloporteur. Les deux compresseurs sont montés en série à l'aide d'une liaison série B (c'est à dire que l'entrée du compresseur HP est connectée à la sortie du compresseur BP par l'intermédiaire de la liaison série B). Généralement, par exemple dans une pompe à chaleur ou une climatisation, le fluide caloporteur, qui provient d'un évaporateur (non représenté), est « aspiré » par le compresseur BP, subit une première étape de compression, puis il est aspiré par le compresseur HP via la liaison série B pour subir un deuxième étage de compression pour enfin être refoulé vers un condenseur (non représenté). Chacun des compresseurs comprend un carter, respectivement 5 et 6, pour une retenue de l'huile. Le dispositif comprend un tube 3 reliant les carters 5 et 6 des compresseurs 1 et 2, le tube 3 comprenant une vanne commandée 4. Le dispositif comprend également un deuxième tube 8 en parallèle (terme « en parallèle » contraire au terme « en série ») du tube 3, le deuxième tube 8 étant muni d'une vanne commandée 9. Le deuxième tube 8 est connecté, aux niveaux des carters 5 et 6 à un niveau supérieur à un niveau maximum voulu de l'huile d'un carter (le deuxième tube 8 n'est donc pas en contact avec l'huile contenu dans les carters).With reference to the figure 1 , a thermodynamic device according to the invention comprises a compressor 1 called "low pressure" (which we will call "BP" later), comprising an inlet 11 and an outlet 12, respectively for the admission and the discharge of a heat transfer fluid, and a compressor 2 called "high pressure" (which we will call "HP" later), comprising an inlet 21 and an outlet 22, respectively for the admission and discharge of the heat transfer fluid. Both compressors are connected in series using a serial link B (that is, the input of the HP compressor is connected to the output of the LP compressor via the serial link B). Generally, for example in a heat pump or an air-conditioning, the coolant, which comes from an evaporator (not shown), is "sucked" by the compressor BP, undergoes a first compression step, then it is sucked by the HP compressor via the serial link B to undergo a second compression stage to finally be discharged to a condenser (not shown). Each of the compressors comprises a housing, respectively 5 and 6, for retaining the oil. The device comprises a tube 3 connecting the casings 5 and 6 of the compressors 1 and 2, the tube 3 comprising a controlled valve 4. The device also comprises a second tube 8 in parallel (term "in parallel" contrary to the term "en series ") of the tube 3, the second tube 8 being provided with a controlled valve 9. The second tube 8 is connected, at the levels of the casings 5 and 6 to a level greater than a desired maximum level of the oil of a casing (the second tube 8 is not in contact with the oil contained in the casings).

Lorsque les compresseurs sont en fonctionnement simultané (fonctionnement appelé mode biétagé), le compresseur BP peut se remplir progressivement d'huile tandis que le compresseur HP se vide d'huile, d'après un phénomène décrit précédemment. Lorsque les compresseurs sont complètement arrêtés, La pression interne du compresseur HP est supérieure à la pression interne du compresseur BP. Pour cette raison, la simple ouverture de la vanne 4 ne suffit pas à équilibrer l'huile dans les carters car la pression supérieure au sein du compresseur HP empêche un transfert de l'huile du carter HP vers le carter BP.When the compressors are in simultaneous operation (so-called two-stage operation), the LP compressor can gradually fill with oil while the HP compressor is empty of oil, according to a phenomenon described above. When the compressors are completely stopped, the internal pressure of the HP compressor is higher than the internal pressure of the LP compressor. For this reason, the simple opening of the valve 4 is not enough to balance the oil in the crankcase because the higher pressure in the HP compressor prevents a transfer of oil from the HP crankcase to the BP crankcase.

Pour cette raison, un procédé d'équilibrage d'huile selon l'invention entre les compresseurs 1 et 2 comprend donc les étapes suivantes :

  • _ ouvrir la vanne 9 afin d'effectuer un équilibrage de la pression,
  • _ une fois l'équilibrage des pressions effectué, ouvrir la vanne 4 afin d'effectuer un équilibrage de l'huile.
For this reason, an oil balancing method according to the invention between the compressors 1 and 2 thus comprises the following steps:
  • _ open the valve 9 to perform a pressure equalization,
  • _ once pressure balancing has been completed, open valve 4 to balance the oil.

La pression initiale du compresseur HP étant supérieure au compresseur BP, l'ouverture de la vanne 9 a pour conséquence d'équilibrer les pressions internes des compresseurs 1 et 2 grâce à un transfert du fluide caloporteur du compresseur HP 2 vers le compresseur BP 1 via le tube 8.As the initial pressure of the HP compressor is greater than the LP compressor, the opening of the valve 9 has the effect of balancing the internal pressures of the compressors 1 and 2 by transferring the heat transfer fluid from the compressor HP 2 to the compressor BP 1 via the tube 8.

Une fois l'équilibrage des pressions réalisé, la vanne 4 du tube 3 est ouverte. Ce qui entraîne un équilibrage des niveaux d'huile par simple gravité (les pressions internes ayant été équilibrées). Ainsi un transfert d'huile s'effectue du carter BP 5 vers le carter HP 6. Il est d'ailleurs prévu, selon l'invention, de connecter le tube 3, au niveau des carters, à un niveau supérieur à un niveau nominal d'huile, évitant ainsi que le niveau de l'huile ne descende en dessous de ce niveau nominal durant l'équilibrage de l'huile.Once the pressure equalization has been achieved, the valve 4 of the tube 3 is opened. This results in a balancing of oil levels by gravity (the internal pressures have been balanced). Thus, an oil transfer is effected from the housing BP 5 to the housing HP 6. According to the invention, it is also intended to connect the tube 3, at the housings, to a level greater than a nominal level. of oil, thus preventing the oil level from falling below this nominal level during the oil balance.

Bien évidemment si, lors de l'utilisation des compresseurs l'huile s'était accumulée dans le carter HP, la procédure reste identique et l'équilibrage de l'huile (après l'équilibrage des pressions) s'effectue avec un transfert de l'huile du carter HP vers le carter BP. Bien entendu dans le cas décrit précédemment, la pression interne du compresseur HP étant supérieure à la pression interne au compresseur BP, un équilibrage des pressions n'est pas nécessaire pour un transfert de l'huile du carter HP vers le carter BP. Cependant, un équilibrage préalable des pressions internes, permet d'assurer que les niveaux d'huile, une fois l'équilibre atteint, soient sensiblement égaux (bien évidemment à la condition que les carters soient sensiblement à la même altitude).Of course if, when using the compressors the oil had accumulated in the HP crankcase, the procedure remains the same and the balancing of the oil (after balancing pressures) is carried out with a transfer of the oil from the HP housing to the BP housing. Of course in the case described above, the internal pressure of the HP compressor being greater than the internal pressure of the LP compressor, a pressure equalization is not necessary for a transfer of the oil from the HP housing to the BP housing. However, a prior balancing of the internal pressures makes it possible to ensure that the oil levels, once the equilibrium is reached, are substantially equal (of course on the condition that the casings are substantially at the same altitude).

Une variante de réalisation du dispositif selon l'invention est présentée sur la figure 2. Le dispositif comprend une liaison A de contournement pour le compresseur BP. Une liaison de contournement est une liaison qui relie l'entrée d'un compresseur à la sortie du même compresseur, court-circuitant ainsi le compresseur sur le circuit thermodynamique. La liaison de contournement A relie donc l'entrée 11 à la sortie 12 du compresseur BP 1. La liaison A comprend également un clapet anti-retour 10 qui empêche lors du fonctionnement du compresseur BP que le fluide en sortie du compresseur ne retourne, via la liaison de contournement A, vers l'entrée du compresseur BP. Ainsi, si la pression au niveau de l'entrée 100 du clapet 10 est supérieure à la pression au niveau de la sortie 102 du clapet 10, alors le clapet devient passant. Dans le cas contraire, le clapet 10 est non passant. La fonction de cette liaison de contournement est de permettre au compresseur HP 2 de fonctionner seul. En effet si le compresseur BP est éteint, le compresseur HP, qui continue de fonctionner, « aspire » le fluide caloporteur par son entrée 21 créant ainsi une dépression dans la liaison série B et sur la liaison A (donc au niveau de la sortie 102 du clapet anti-retour 10), cette dépression provoque l'ouverture du clapet anti-retour 10 et par conséquence la circulation du fluide caloporteur via la liaison A, permettant ainsi au compresseur HP de fonctionner seul. Généralement, le compresseur HP comprend également une liaison de contournement et un clapet anti-retour (non représenté).An alternative embodiment of the device according to the invention is presented on the figure 2 . The device includes a bypass link A for the LP compressor. A bypass link is a link that connects the input of a compressor to the output of the same compressor, thereby bypassing the compressor on the thermodynamic circuit. The bypass connection A thus connects the inlet 11 to the outlet 12 of the compressor BP 1. The link A also comprises a nonreturn valve 10 which prevents, during the operation of the compressor BP, that the fluid leaving the compressor returns via the bypass link A, to the inlet of the LP compressor. Thus, if the pressure at the inlet 100 of the valve 10 is greater than the pressure at the outlet 102 of the valve 10, then the valve becomes on. In the opposite case, the valve 10 is non-conducting. The function of this bypass is to allow the HP 2 compressor to run on its own. Indeed if the BP compressor is off, the HP compressor, which continues to operate, "sucks" the heat transfer fluid through its inlet 21 thus creating a vacuum in the serial link B and on the link A (so at the output 102 10), this depression causes the opening of the non-return valve 10 and consequently the circulation of the heat transfer fluid via the link A, thus allowing the HP compressor to operate alone. Generally, the HP compressor also includes a bypass connection and a check valve (not shown).

La vanne commandée 9 se situe alors sur la liaison de contournement A, en parallèle (terme « en parallèle » contraire au terme « en série ») du clapet anti-retour 10. Bien évidemment, afin de respecter la fonction anti-retour du clapet 10, la vanne 9 est normalement fermée lors de l'utilisation des compresseurs.The controlled valve 9 is then located on the bypass connection A, in parallel (term "in parallel" contrary to the term "in series") of the non-return valve 10. Of course, in order to respect the non-return function of the valve 10, the valve 9 is normally closed when using the compressors.

Un procédé d'équilibrage selon l'invention pour cette réalisation est exactement le même que précédemment :

  • _ ouvrir la vanne 9 afin d'effectuer un équilibrage de la pression,
  • _ une fois l'équilibrage des pressions effectuée, ouvrir la vanne 4 afin d'effectuer un équilibrage de l'huile.
A balancing method according to the invention for this embodiment is exactly the same as before:
  • _ open the valve 9 to perform a pressure equalization,
  • _ once pressure balancing has been completed, open valve 4 to balance the oil.

En effet la pression interne d'un compresseur (et donc la pression au niveau de la retenue d'huile dans le carter) étant la même que celle à l'entrée du compresseur, l'ouverture de la vanne 9 provoque un équilibrage entre l'entrée 11 du compresseur 1 et l'entrée 21 du compresseur 2, et par conséquent, provoque un équilibrage entre la pression interne du compresseur BP 1 et la pression interne du compresseur HP 2. Une fois l'équilibrage des pressions obtenu, il suffit d'ouvrir, comme précédemment la vanne 4 pour obtenir un équilibrage de l'huile entre les compresseurs.Indeed the internal pressure of a compressor (and therefore the pressure at the oil reservoir in the housing) is the same as that at the compressor inlet, the opening of the valve 9 causes a balancing between the input 11 of the compressor 1 and the inlet 21 of the compressor 2, and consequently, causes a balancing between the internal pressure of the compressor BP 1 and the internal pressure of the compressor HP 2. Once the pressure equalization obtained, it is sufficient to open, as previously the valve 4 to obtain a balancing of the oil between the compressors.

En référence à la figure 3, illustrant une autre variante de réalisation de dispositif selon l'invention, le clapet anti-retour 10 peut être supprimé. En effet, la fonction anti-retour est alors assurée par la vanne 9 en la gardant normalement fermée lors de l'utilisation des compresseurs. Si une utilisation du compresseur HP seul est souhaitée, alors il suffit d'ouvrir la vanne 9.With reference to the figure 3 , illustrating another alternative embodiment of the device according to the invention, the nonreturn valve 10 can be removed. Indeed, the anti-return function is then provided by the valve 9 keeping it normally closed when using the compressors. If use of the HP compressor alone is desired, then just open the valve 9.

Un procédé d'équilibrage selon l'invention pour cette réalisation est exactement le même que précédemment :

  • _ ouvrir la vanne 9 afin d'effectuer un équilibrage de la pression,
  • _ une fois l'équilibrage des pressions effectuée, ouvrir la vanne 4 afin d'effectuer un équilibrage de l'huile.
A balancing method according to the invention for this embodiment is exactly the same as before:
  • _ open the valve 9 to perform a pressure equalization,
  • _ once pressure balancing has been completed, open valve 4 to balance the oil.

Les conséquences sur l'équilibrage des pressions et de l'huile restent les mêmes que celles décrites précédemment.The consequences on the balancing of the pressures and the oil remain the same as those described previously.

Il est à noter que si une telle réalisation est envisagée, il faut prévoir une vanne relativement robuste (et donc plus onéreuse) pour supporter, à elle seule, le passage du fluide caloporteur lors de l'utilisation du compresseur HP seul. En effet dans les autres réalisations décrites, la fonction de la vanne 9 étant simplement d'équilibrer les pressions (l'équilibrage s'effectuant généralement dans un temps relativement court), il n'est pas nécessaire que la vanne 9 soit d'une grande robustesse (et donc peut être d'un coût moindre).It should be noted that if such an embodiment is envisaged, it is necessary to provide a relatively robust valve (and therefore more expensive) to support, alone, the passage of heat transfer fluid when using the HP compressor alone. Indeed, in the other embodiments described, the function of the valve 9 is simply to balance the pressures (the balancing is generally performed in a relatively short time), it is not necessary that the valve 9 is a high robustness (and therefore may be of a lower cost).

D'une manière générale, la vanne 9 peut être située à n'importe quel endroit du circuit thermodynamique à condition qu'elle soit connectée par un de ses cotés à la pression interne du compresseur BP (par exemple via l'entrée 11), et par l'autre coté, à la pression interne du compresseur HP. Ainsi, une ouverture de la vanne 9 provoque un court-circuitage du compresseur BP en amenant la pression d'entrée du compresseur HP à la pression d'entrée du compresseur BP.In general, the valve 9 can be located anywhere in the thermodynamic circuit provided that it is connected by one of its sides to the internal pressure of the compressor BP (for example via the inlet 11), and on the other side, the internal pressure of the HP compressor. Thus, an opening of the valve 9 causes a short-circuiting of the LP compressor by bringing the inlet pressure of the HP compressor to the inlet pressure of the LP compressor.

Il est donc possible d'imaginer une multitude de possibilités de positionnements pour la vanne 9 sans pour autant sortir du cadre de l'invention.It is therefore possible to imagine a multitude of positioning possibilities for the valve 9 without departing from the scope of the invention.

Si pour une quelconque raison (par exemple un redémarrage intempestif des compresseurs), l'équilibrage n'a pas eu le temps de s'effectuer entièrement, il est prévu selon l'invention de terminer l'équilibrage de l'huile au redémarrage des compresseurs.If for any reason (for example an untimely restart of the compressors), the balancing has not had time to complete, it is provided according to the invention to complete the balancing of the oil at restart of the compressors.

En effet il est prévu selon l'invention, le procédé suivant :

  • fermer la vanne 9 (afin de ne pas court-circuiter le compresseur BP), sauf dans le cas où la vanne 9 remplie également la fonction anti-retour de la liaison de contournement A comme sur la figure 3,
  • démarrer le compresseur HP,
  • Une fois le compresseur HP démarré, ouvrir la vanne 4,
Indeed, according to the invention, the following method is provided:
  • close the valve 9 (in order not to short circuit the LP compressor), except in the case where the valve 9 also fulfills the non-return function of the bypass connection A as on the figure 3 ,
  • start the HP compressor,
  • Once the HP compressor is started, open valve 4,

Une fois l'équilibrage de l'huile effectué :

  • fermer la vanne 4,
  • démarrer le compresseur BP.
Once the oil has been equilibrated:
  • close the valve 4,
  • start the BP compressor.

En effet, lorsque le compresseur HP fonctionne seul (avant que le compresseur BP ne démarre), le fluide passe alors par la liaison de contournement A. Les pertes de charge du circuit emprunté par le fluide (c'est-à-dire A, B, 21) étant nettement supérieures aux pertes de charge du tube 3, une dépression au sein du carter 6 du compresseur HP est crée. Cette dépression « aspire » directement l'huile du compresseur BP vers le compresseur HP au travers du tube 3 (la vanne 4 étant ouverte). Il est prévu de ne pas laisser la vanne 4 ouverte trop longtemps afin de ne pas amener le niveau d'huile du carter BP en dessous d'un niveau critique.Indeed, when the HP compressor operates alone (before the BP compressor starts), the fluid then passes through the bypass connection A. The pressure losses of the circuit taken by the fluid (that is to say A, B, 21) being significantly greater than the pressure losses of the tube 3, a vacuum within the housing 6 of the HP compressor is created. This depression "sucks" the BP compressor oil directly to the HP compressor through the tube 3 (the valve 4 being open). It is planned not to leave the valve 4 open too long to avoid bringing the oil level of the BP crankcase below a critical level.

Dans le procédé décrit précédemment, avant que le compresseur BP ne démarre, seul le compresseur HP subit la différence de pression totale entre une pression de condensation (pression de sortie du compresseur HP) et la pression d'évaporation (pression d'entrée du compresseur BP), fonctionnant ainsi hors de la gamme nominale de fonctionnement du compresseur et réduisant alors la durée de vie de l'appareil.In the process described above, before the LP compressor starts, only the HP compressor experiences the total pressure difference between a condensing pressure (HP compressor outlet pressure) and the evaporation pressure (compressor inlet pressure). BP), thus operating outside the nominal operating range of the compressor and thus reducing the service life of the device.

Avantageusement, il est prévu d'accélérer l'équilibrage de l'huile lors de la phase de démarrage. A cet effet (et de retour à la figure 3), il est prévu de fermer la vanne 9 dés le démarrage du compresseur HP. Ainsi, la fermeture de la vanne 9 empêchant le fluide de circuler librement dans la liaison de contournement A (les pertes de charge du circuit emprunté par le fluide A, B, 21 devenant ainsi infini), une dépression importante est crée au sein du carter 6 du compresseur HP. Cette dépression importante « aspire » plus rapidement l'huile du compresseur BP vers le compresseur HP au travers du tube 3 (la vanne 4 étant ouverte).Advantageously, it is planned to accelerate the balancing of the oil during the start-up phase. For this purpose (and back to figure 3 ), it is planned to close the valve 9 from the start of the HP compressor. Thus, the closing of the valve 9 preventing the fluid to flow freely in the bypass connection A (the pressure drops of the circuit taken by the fluid A, B, 21 becoming infinite), a significant depression is created within the housing 6 of the HP compressor. This significant depression "sucks" more quickly oil from the BP compressor to the HP compressor through the tube 3 (the valve 4 being open).

En référence à la figure 4, illustrant une autre variante de réalisation de dispositif selon l'invention, il est prévu de placer une troisième vanne 7 sur la liaison série B. Cette vanne a pour fonction d'accélérer l'équilibrage d'huile lors du démarrage seul du compresseur HP.With reference to the figure 4 , illustrating another alternative embodiment of the device according to the invention, it is planned to place a third valve 7 on the series link B. This valve has the function of accelerating the oil balancing at the start of the HP compressor alone .

Ainsi le procédé d'équilibrage d'huile lors du démarrage du compresseur HP comprend les étapes suivantes :

  • _fermer la vanne 9, afin de ne pas court-circuiter le compresseur BP
  • _laisser ouverte la vanne 4
  • _fermer la vanne 7
Thus, the method of balancing oil during startup of the HP compressor comprises the following steps:
  • _close valve 9, so as not to short-circuit the LP compressor
  • open the valve 4
  • _close the valve 7

Ainsi, la fermeture de la vanne 7 empêchant le fluide de circuler librement sur la liaison B, une dépression importante est créée au sein du carter 6 du compresseur HP. Cette dépression importante « aspire » plus rapidement l'huile du compresseur BP vers le compresseur HP au travers du tube 3 (la vanne 4 étant ouverte).Thus, closing the valve 7 preventing the fluid to flow freely on the link B, a significant depression is created in the housing 6 of the HP compressor. This significant depression "sucks" more quickly oil from the BP compressor to the HP compressor through the tube 3 (the valve 4 being open).

Si malgré l'ensemble des procédés décrits précédemment, l'équilibrage de l'huile n'a pas eu le temps de s'effectuer entièrement, il est prévu selon l'invention un procédé d'équilibrage de l'huile durant une phase d'arrêt des compresseurs. Le procédé comprend alors les étapes suivantes :

  • fermer la vanne 9 (si elle n'est pas déjà fermée),
  • arrêter le compresseur BP,
  • fermer la vanne 7,
  • ouvrir la vanne 4,
If, in spite of all of the processes described above, the equilibration of the oil has not had time to take place completely, it is provided according to the invention a method of balancing the oil during a production phase. compressor shutdown. The method then comprises the following steps:
  • close the valve 9 (if it is not already closed),
  • stop the BP compressor,
  • close the valve 7,
  • open the valve 4,

Une fois l'équilibrage de l'huile effectué,

  • fermer la vanne 4,
  • ouvrir la vanne 7,
  • arrêter le compresseur HP.
Once the balancing of the oil has been done,
  • close the valve 4,
  • open the valve 7,
  • stop the HP compressor.

De manière générale, la vanne 7 peut être placée à n'importe quel endroit du circuit thermodynamique à condition que sa fermeture empêche la circulation du fluide caloporteur vers le compresseur HP.In general, the valve 7 can be placed anywhere in the thermodynamic circuit provided that its closure prevents the circulation of heat transfer fluid to the HP compressor.

Dans un cas où l'équilibrage d'huile doit être effectué avec un transfert du carter HP vers le carter BP (dans le cas où un surplus d'huile se situerait dans le carter HP), il suffit alors simplement, après le démarrage des compresseurs, d'ouvrir la vanne 4. La pression du compresseur HP étant supérieure à celle du compresseur BP, le transfert s'effectue du carter HP vers le carter BP.In a case where the oil balance must be carried out with a transfer of the HP crankcase to the BP crankcase (in the case where a surplus of oil would be in the HP crankcase), then simply after the start of compressors, to open the valve 4. As the pressure of the HP compressor is higher than that of the LP compressor, the transfer takes place from the HP casing to the BP casing.

Claims (10)

Dispositif thermodynamique comprenant un compresseur basse pression (BP) monté en série avec un compresseur haute pression (HP) à l'aide d'une liaison série (B) ; chaque compresseur comprenant un carter (respectivement 5 et 6) pour la retenue d'huile, et un tube (3) reliant les carters des compresseurs, le tube (3) comprenant une première vanne commandée (4), caractérisé en ce qu'il comprend également une deuxième vanne commandée (9) destinée à effectuer un équilibrage entre une pression interne du compresseur basse pression (1) et une pression interne du compresseur haute pression (2).A thermodynamic device comprising a low pressure compressor (LP) connected in series with a high pressure compressor (HP) by means of a serial link (B); each compressor comprising a casing (respectively 5 and 6) for oil retention, and a tube (3) connecting the compressor housings, the tube (3) comprising a first controlled valve (4), characterized in that also comprises a second controlled valve (9) for balancing an internal pressure of the low pressure compressor (1) with an internal pressure of the high pressure compressor (2). Dispositif thermodynamique selon la revendication précédente caractérisé en ce que la deuxième vanne (9) est connectée par un de ses cotées au niveau de la pression interne du compresseur basse pression (1) et par l'autre coté au niveau de la pression interne du compresseur haute pression (2).Thermodynamic device according to the preceding claim characterized in that the second valve (9) is connected by one of its sides to the internal pressure of the low pressure compressor (1) and on the other side to the internal pressure of the compressor high pressure (2). Dispositif thermodynamique selon l'une des revendications précédentes caractérisé en ce que la deuxième vanne (9) est située sur un deuxième tube (8) reliant les carters entre eux, en parallèle du premier tube (3) et étant connecté à un niveau supérieur à un niveau maximum voulu de l'huile d'un carter.Thermodynamic device according to one of the preceding claims characterized in that the second valve (9) is located on a second tube (8) connecting the casings together, in parallel with the first tube (3) and being connected to a level greater than a desired maximum level of crankcase oil. Dispositif thermodynamique selon l'une des revendications précédentes caractérisé en ce que la deuxième vanne (9) est située sur une liaison de contournement (A) du compresseur basse pression (1).Thermodynamic device according to one of the preceding claims characterized in that the second valve (9) is located on a bypass connection (A) of the low pressure compressor (1). Dispositif thermodynamique selon l'une des revendications précédentes caractérisé en ce que la deuxième vanne (9) est située en parallèle d'un clapet anti-retour (10) de la liaison de contournement (A) du compresseur basse pression (1).Thermodynamic device according to one of the preceding claims characterized in that the second valve (9) is located in parallel with a non-return valve (10) of the bypass connection (A) of the low pressure compressor (1). Dispositif thermodynamique selon l'une des revendications précédentes caractérisé en ce qu'il comprend une troisième vanne (7) destinée à empêcher une circulation d'un fluide caloporteur vers le compresseur haute pression (2).Thermodynamic device according to one of the preceding claims, characterized in that it comprises a third valve (7) intended to prevent circulation of a coolant towards the high-pressure compressor (2). Dispositif thermodynamique selon l'une des revendications précédentes caractérisé en ce que la troisième vanne (7) est située sur la liaison série (B).Thermodynamic device according to one of the preceding claims, characterized in that the third valve (7) is located on the series link (B). Dispositif thermodynamique selon l'une des revendications précédentes caractérisé en ce que le premier tube (3) est connecté à un niveau supérieur à un niveau d'huile nominal.Thermodynamic device according to one of the preceding claims characterized in that the first tube (3) is connected to a level above a nominal oil level. Procédé pour un équilibrage rapide d'huile entre compresseurs dans un dispositif selon l'une des revendications précédentes, caractérisé en ce qu'il comprend les étapes suivantes : - arrêter les compresseurs, - une fois les compresseurs (1,2) à l'arrêt, ouvrir la deuxième vanne (9), - une fois l'équilibre entre la pression interne du compresseur basse pression (1) et la pression interne du compresseur haute pression (2) atteint, ouvrir la première vanne (4). A method for rapid balancing of oil between compressors in a device according to one of the preceding claims, characterized in that it comprises the following steps: - stop the compressors, - once the compressors (1,2) have stopped, open the second valve (9), - Once the internal pressure of the low pressure compressor (1) has been balanced with the internal pressure of the high pressure compressor (2), open the first valve (4). Procédé d'équilibrage selon la revendication précédente, caractérisé en ce qu'il comprend en outre les étapes suivantes : - fermer la deuxième vanne (9) sauf dans le cas où la deuxime vanne (9) remplie également la fonction anti-retour de la liaison de contournement (A), - démarrer le compresseur haute pression (2), - fermer la troisième vanne (7), - une fois le compresseur haute pression (2) démarré, ouvrir la première vanne (4). Balancing method according to the preceding claim, characterized in that it further comprises the following steps: - closing the second valve (9) except in the case where the second valve (9) also fulfills the non-return function of the bypass connection (A), - start the high pressure compressor (2), - close the third valve (7), - once the high pressure compressor (2) has started, open the first valve (4).
EP08163878A 2007-09-07 2008-09-08 Device and method for balancing oil between compressors Active EP2034258B1 (en)

Priority Applications (1)

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PL08163878T PL2034258T3 (en) 2007-09-07 2008-09-08 Device and method for balancing oil between compressors

Applications Claiming Priority (1)

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FR0757430A FR2920838B1 (en) 2007-09-07 2007-09-07 DEVICE AND METHOD FOR BALANCING OIL BETWEEN COMPRESSORS

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EP2034258B1 EP2034258B1 (en) 2011-06-22

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AT (1) ATE514043T1 (en)
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WO2013004974A1 (en) * 2011-07-06 2013-01-10 Electricite De France Method for balancing lubricant levels in a multi-stage compression unit of a heat exchange system, and heat exchange system implementing such a method
JP2014145556A (en) * 2013-01-30 2014-08-14 Mitsubishi Heavy Ind Ltd Two-stage compression device and refrigeration/air-conditioning apparatus employing the same
DE102013014543A1 (en) * 2013-09-03 2015-03-05 Stiebel Eltron Gmbh & Co. Kg heat pump device
EP3392577A4 (en) * 2016-03-28 2018-12-26 Mitsubishi Heavy Industries Thermal Systems, Ltd. Multistage compression device, refrigeration cycle comprising same, and operation method for multistage compression device

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CN102818390A (en) * 2011-06-08 2012-12-12 Lg电子株式会社 Refrigerating cycle apparatus and method for operating the same
US8863533B2 (en) 2011-06-08 2014-10-21 Lg Electronics Inc. Refrigerating cycle apparatus and method for operating the same
CN102818390B (en) * 2011-06-08 2015-12-09 Lg电子株式会社 Refrigerating circulatory device and method of operating thereof
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WO2013004974A1 (en) * 2011-07-06 2013-01-10 Electricite De France Method for balancing lubricant levels in a multi-stage compression unit of a heat exchange system, and heat exchange system implementing such a method
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JP2014145556A (en) * 2013-01-30 2014-08-14 Mitsubishi Heavy Ind Ltd Two-stage compression device and refrigeration/air-conditioning apparatus employing the same
EP2762803A3 (en) * 2013-01-30 2015-11-18 Mitsubishi Heavy Industries, Ltd. Two-stage compression device and chilling/air-conditioning device using the same
DE102013014543A1 (en) * 2013-09-03 2015-03-05 Stiebel Eltron Gmbh & Co. Kg heat pump device
EP3392577A4 (en) * 2016-03-28 2018-12-26 Mitsubishi Heavy Industries Thermal Systems, Ltd. Multistage compression device, refrigeration cycle comprising same, and operation method for multistage compression device

Also Published As

Publication number Publication date
FR2920838B1 (en) 2009-11-27
EP2034258B1 (en) 2011-06-22
ATE514043T1 (en) 2011-07-15
PL2034258T3 (en) 2011-11-30
FR2920838A1 (en) 2009-03-13

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