WO2003106901A1 - Vaporizing device for air conditioning loop - Google Patents

Vaporizing device for air conditioning loop Download PDF

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Publication number
WO2003106901A1
WO2003106901A1 PCT/FR2003/001781 FR0301781W WO03106901A1 WO 2003106901 A1 WO2003106901 A1 WO 2003106901A1 FR 0301781 W FR0301781 W FR 0301781W WO 03106901 A1 WO03106901 A1 WO 03106901A1
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WO
WIPO (PCT)
Prior art keywords
compressor
capillary
housing
fluid
buckle according
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.)
Ceased
Application number
PCT/FR2003/001781
Other languages
French (fr)
Inventor
Guy Montaille
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Climatisation SA
Original Assignee
Valeo Climatisation SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Valeo Climatisation SA filed Critical Valeo Climatisation SA
Priority to AU2003260586A priority Critical patent/AU2003260586A1/en
Publication of WO2003106901A1 publication Critical patent/WO2003106901A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating devices
    • B60H1/00321—Heat exchangers for air-conditioning devices
    • B60H1/00342—Heat exchangers for air-conditioning devices of the liquid-liquid type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating devices
    • B60H1/32—Cooling devices
    • B60H1/3204—Cooling devices using compression
    • B60H1/3229—Cooling devices using compression characterised by constructional features, e.g. housings, mountings, conversion 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
    • F25B40/00—Subcoolers, desuperheaters or superheaters
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/39—Dispositions with two or more expansion means arranged in series, i.e. multi-stage expansion, on a refrigerant line leading to the same evaporator
    • 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
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/006—Accumulators
    • 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
    • F25B2339/00—Details of evaporators; Details of condensers
    • F25B2339/04—Details of condensers
    • F25B2339/044—Condensers with an integrated receiver
    • 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
    • F25B2400/05—Compression system with heat exchange between particular parts of the system
    • F25B2400/051—Compression system with heat exchange between particular parts of the system between the accumulator and another part of the cycle
    • 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
    • F25B2400/05—Compression system with heat exchange between particular parts of the system
    • F25B2400/052—Compression system with heat exchange between particular parts of the system between the capillary tube and another part of the refrigeration cycle
    • 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
    • F25B2500/01—Geometry problems, e.g. for reducing size

Definitions

  • the invention relates to an air conditioning loop, in particular for an air conditioning installation for the passenger compartment of a vehicle.
  • a conventional air conditioning loop comprises a compressor, a condenser, an expansion device and an evaporator traversed, in this order, by a refrigerant fluid.
  • the refrigerant is compressed in the gas phase and brought to a high pressure by the compressor. It is then transformed into the liquid phase by the condenser, then undergoes a pressure loss while passing through the expansion member, which can for example be a calibrated orifice. '
  • the liquid partially vaporizes in the expansion member as it cools.
  • a mixture of vapor and liquid at low pressure is obtained, which is transmitted to the evaporator where it is transformed into the gaseous phase.
  • Such droplets at the outlet of the evaporator conventionally appear when the expansion member is a variable or fixed calibrated orifice. They may also appear in certain critical stages of operation of the installation.
  • phase separators are bulky and significantly increase the size and weight of the air conditioning installation. They do not make it possible to optimize the space occupied by the air conditioning installation in the vehicle. Furthermore, such separators significantly increase the cost of an air conditioning installation for a vehicle.
  • the invention proposes, for this purpose, a coolant loop, in particular for a vehicle air conditioning installation, comprising a compressor capable of raising the pressure of the fluid to the gaseous state, a condenser capable of passing the compressed fluid through the compressor in the liquid state, an expansion member capable of lowering the pressure of the fluid condensed by the condenser and an evaporator capable of passing the expanded fluid to the gaseous state before its return to the compressor, as well as means, placed between the evaporator and the compressor, to prevent liquid from entering the compressor.
  • the loop also includes a first conduit connecting the outlet of the compressor • the condenser inlet.
  • the means for preventing the entry of liquid into the compressor comprise a housing, in which the fluid coming from the evaporator circulates towards the compressor, while the housing is shaped to house part of the first conduit, said part, called capillary, having a diameter of less than 8 millimeters.
  • the fluid coming from the evaporator towards the compressor circulates in the housing in a substantially horizontal longitudinal direction.
  • the means for preventing the entry of liquid into the compressor comprise a housing, limited by a side wall of revolution, of substantially horizontal axis, a first end wall connected by a conduit to the outlet of the evaporator and a second end wall, connected by a conduit to the inlet of the compressor, said wall defining the interior volume of said means.
  • the side wall of the housing is substantially cylindrical.
  • the walls of said means have two openings, these two openings allowing the capillary to enter and exit into the housing.
  • the length of the capillary is greater than the length of the wall of the housing.
  • the length of the capillary (8) is notably less than 1 meter.
  • the capillary is substantially in the form of a helix.
  • the capillary can also have fins on its outer wall.
  • the capillary is made of stainless material.
  • the capillary is made of aluminum or an aluminum alloy.
  • the loop includes a reservoir capable of absorbing variations in the volume of the fluid.
  • the reservoir can be placed between the outlet of the condenser and the inlet of the expansion member.
  • the reservoir is integrated into the condenser, the latter comprising a sub-cooling zone downstream of the reservoir.
  • the expansion member is in the form of a calibrated orifice.
  • FIG. 1 is an overall view of an air conditioning loop of a vehicle air conditioning installation, according to an embodiment of the prior art
  • FIG. 2 represents a diagram of an air conditioning loop of the prior art comprising a phase separator
  • FIG. 3 represents a diagram of an air conditioning loop, according to an embodiment of the invention
  • FIG. 4 is a view in axial section of the vaporization device, according to this embodiment.
  • FIG. 5 shows a diagram of an air conditioning loop, according to another embodiment of the invention
  • - Figure 6 is an axial sectional view of the vaporization device, according to this other embodiment.
  • the drawings essentially contain elements of a certain character. They can therefore not only serve to better understand the description, but also contribute to the definition of the invention, if necessary.
  • FIG. 1 shows an overview of an air conditioning loop integrated into a vehicle.
  • the air conditioning loop is traversed by a refrigerant, for example R134a refrigerant.
  • the air conditioning loop comprises a compressor 1, a condenser 2, a liquid tank 3, an expansion member 4 and an evaporator 5, traversed in this order by the refrigerant, and connected together by a set of conduits.
  • the set of conduits comprises a first conduit 91 connecting the outlet of the compressor to the inlet of the condenser, a second conduit 92 connecting the outlet of the evaporator to the inlet of the compressor, a third conduit 93 connecting the outlet of the condenser to the inlet of the liquid container and a fourth conduit 94 connecting the liquid reservoir to the expansion member.
  • liquid reservoir 3 can be integrated into the condenser 2, in which case the third conduit 930 connects the outlet of the condenser to the expansion member and the fourth conduit 940 connects the expansion member to the inlet of the evaporator.
  • This embodiment is illustrated in Figure 2. -
  • the refrigerant circulating in the set of conduits of FIG. 1 undergoes a rise in pressure and temperature in the compressor 1.
  • the fluid is then transformed into the liquid phase at high pressure by the condenser 2.
  • the expansion member 4 lowers the pressure created by the compressor.
  • the expansion member can be a calibrated orifice or a regulator, for example a thermostatic regulator. The description will be made below with reference to a. calibrated orifice, by way of example, not limiting.
  • the refrigerant is in the form of a mixture of vapor and liquid at low pressure. This mixture then arrives in the evaporator 5 which causes the liquid to evaporate by removing the " heat from an air flow 51.
  • the condenser 2 receives an external air flow 21 to evacuate this heat as well as the heat produced by compression of the fluid.
  • FIG. 2 is a schematic view of the air conditioning loop of the prior art, described above.
  • This air conditioning loop includes a phase separator 6 placed between the evaporator and the compressor on the duct 92.
  • This phase separator is intended to prevent absorption of liquid droplets by the compressor, possibly transmitted by the evaporator 5.
  • the phase separator 6 is in the form of a tank capable of separating the liquid phase from the vapor phase of the refrigerant which circulates between the evaporator and the compressor. It only transmits the vapor phase to the compressor.
  • the liquid phase which is sent to the bottom of the phase separator, can be vaporized by external heat supply to be in turn transmitted to the compressor.
  • the Applicant has set up an air conditioning loop making it possible to simplify this operation, while retaining satisfactory performance.
  • the invention provides an air conditioning loop in which the elimination of the liquid is carried out by heat exchange between part of the high pressure zone HP of the loop and part of the low pressure zone BP.
  • the high pressure area is located above the dashed line and the low pressure area below the dashed line.
  • the air conditioning loop comprises a means for preventing the entry of liquid into the compressor, said vaporization device 78, disposed between the outlet of the evaporator 5 and the inlet of the compressor 1.
  • the vaporization device 78 comprises a housing of cylindrical shape of revolution, suitable for receiving the low pressure fluid coming from the evaporator 5 and comprising possible droplets of liquid, and for transmitting the fluid to the compressor 1 after treatment.
  • the housing 7 of the vaporization device is traversed by the conduit 91 connecting the outlet of the compressor 1 to the inlet of the condenser 2. More specifically, the part 8 of the first conduit housed in the housing is a conduit of small diameter, called capillary. The diameter of the capillary is advantageously less than 8 millimeters.
  • This particular configuration makes it possible to replace the vaporization device of the prior art by vaporizing the droplets of liquid possibly present in the fluid coming from the evaporator 5.
  • this conformation makes it possible to effect a temperature reduction in the capillary and therefore pre-expansion.
  • the housing 7 of the phase separator is oriented horizontally and is limited by a cylindrical side wall 72, and two end walls 70 and 71.
  • the end wall 70 is tightly connected to the outlet of the evaporator via part 920 of the second duct 92.
  • the end wall 71 is tightly connected to the inlet of the compressor by the part 921 of the second duct 92.
  • the wall of the housing of the vaporization device comprises a first opening 80, produced for example on the wall the end 70, and a second opening 81, produced for example on the end wall 71.
  • the second opening 81 is located between the first opening 80 and the end of the housing 7, delimited by the end wall 71.
  • the capillary from the outlet of the compressor is introduced through the opening 81 and exits through the opening 80 towards the inlet of the condenser.
  • the capillary is welded to the housing at these openings by techniques known to those skilled in the art.
  • the capillary 8 is housed in the housing 7 of the vaporization device.
  • the capillary 8 of the vaporization device 78 has a length greater than the length of the housing. In an advantageous embodiment, this length is less than 1 meter.
  • the capillary 8 has a helical shape, in order to accommodate a large length of the capillary in the housing.
  • the refrigerant circulates in the capillary 8 in the compressor / condenser direction. This direction of circulation is indicated by the arrows in broken lines in the figure-.
  • the compression in compressor 1 has allowed the fluid to reach a high pressure and temperature, and therefore the fluid passing through the capillary is also at high pressure and temperature.
  • the fluid circulates in the housing, outside the capillary, in the evaporator / compressor direction, as indicated by the arrows in solid line.
  • the fluid leaving the evaporator is at low pressure and at low temperature.
  • the fluid flowing in the housing, outside the capillary, and the fluid flowing in the capillary are counter-current.
  • the temperature difference between the fluid flowing in the capillary 8 and the fluid flowing outside the capillary in the housing promotes heat exchange.
  • This heat exchange is able to vaporize the droplets of liquid possibly present in the fluid which circulates in the second conduit, outside the capillary 40. It therefore makes it possible to supply the compressor only with gaseous refrigerant and to dispense with the use of an oversized spray device.
  • the capillary can be shaped to promote heat exchange. It may for example include small fins which increase the heat dissipation.
  • FIGS 5 and 6 illustrate a second embodiment of the invention.
  • the capillary coming from the outlet of the condenser 2 is introduced into the opening 80 and exits through the opening 81. Consequently, the refrigerant which circulates in the housing 7 outside the capillary 8 and the refrigerant which circulates in the capillary 8 have the same direction of circulation.
  • the air conditioning loop also comprises a liquid reservoir 3 capable of absorbing variations in the volume of the fluid.
  • the liquid tank can be placed between the condenser and the calibrated orifice.
  • the capillary 8 of the vaporization device 78 is immersed in the fluid which circulates in the housing and is therefore liable to undergo oxidation.
  • the capillary 8 is produced from stainless material, in particular aluminum or aluminum alloy.
  • the vaporization device 78 therefore makes it possible to carry out the function of evaporation of the droplets of liquids possibly present at the outlet of the evaporator, while ensuring a pre-expansion function.
  • the air conditioning loop provides a liquid reserve and efficient filtration.
  • the size of the air conditioning loop is also improved.
  • the phase separator consists of a simple housing and a capillary. It contains no mechanical parts and requires no adjustment.
  • the overall size is improved by nesting part of the first conduit 91 in the housing which is placed on the second conduit 92. This reduction in the overall dimensions of the air conditioning loop is particularly advantageous for air conditioning installations of motor vehicles which are housed in increasingly smaller engine compartments.
  • the invention is not limited to the embodiments described above by way of example and extends to other variants, in particular as regards the choice of the length of the capillary.
  • the invention can use a relation linking this length to the diameter of the capillary. Such a relationship depends on the following parameters:
  • the capillary for example, circular or square section
  • the invention is not limited to a cylindrical case.
  • other forms can be envisaged.
  • the invention is also not limited to an expansion member of the calibrated orifice type.
  • Other types of trigger devices can be used, such as a thermostatic expansion valve.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

The invention concerns a refrigerating fluid loop comprising a vaporizing device (78) arranged between the evaporator (5) and the compressor (1) to avoid liquid intake into the compressor. The vaporizing device includes a housing (7), wherein the fluid from the evaporator (5) flows towards the compressor (1), while the housing is configured to house part (8) of the conduit connecting the compressor output to the condenser input, said part having a small diameter. Said air conditioning loop is applicable in particular to air conditioning units in motor vehicles.

Description

Dispositif de vaporisation pour boucle de climatisationSpray device for air conditioning loop

L'invention concerne une boucle de climatisation, notamment pour une installation de climatisation de l'habitacle d'un véhicule.The invention relates to an air conditioning loop, in particular for an air conditioning installation for the passenger compartment of a vehicle.

Une boucle de climatisation classique comporte un compresseur, un condenseur, un organe de détente et un évaporateur parcourus, dans cet ordre, par un fluide réfrigérant. Le fluide réfrigérant est comprimé en phase gazeuse et amené à une pression élevée par le compresseur. Il est ensuite transformé en phase liquide par le condenseur, puis subit une perte de pression en passant dans l'organe de détente, qui peut être par exemple un orifice calibré. ' Le liquide se vaporise partiellement dans l'organe de détente en refroidissant. A la sortie de l'organe de détente, on obtient un mélange de vapeur et de liquide à basse pression, qui est transmis à l'évaporateur où il est transformé en phase gazeuse.A conventional air conditioning loop comprises a compressor, a condenser, an expansion device and an evaporator traversed, in this order, by a refrigerant fluid. The refrigerant is compressed in the gas phase and brought to a high pressure by the compressor. It is then transformed into the liquid phase by the condenser, then undergoes a pressure loss while passing through the expansion member, which can for example be a calibrated orifice. ' The liquid partially vaporizes in the expansion member as it cools. At the outlet of the expansion member, a mixture of vapor and liquid at low pressure is obtained, which is transmitted to the evaporator where it is transformed into the gaseous phase.

Dans des réalisations existantes, on utilise en outre un séparateur de phases placé entre l'évaporateur et le compresseur pour protéger le compresseur contre une aspiration 'de gouttelettes de liquide. En effet, dans certaines conditions de fonctionnement, des gouttelettes de liquide sont présentes en sortie de l'évaporateur et sont aspirées par le compres- seur. Ces gouttelettes de liquide peuvent provoquer un dysfonctionnement du compresseur ou une dégradation des performances thermiques du système.In existing embodiments, further using a phase separator disposed between the evaporator and the compressor to protect the compressor against a suction 'of liquid droplets. In fact, under certain operating conditions, droplets of liquid are present at the outlet of the evaporator and are sucked in by the compressor. These liquid droplets can cause the compressor to malfunction or degrade the thermal performance of the system.

De telles gouttelettes en sortie de l'évaporateur apparais- sent classiquement lorsque l'organe de détente est un orifice calibré variable ou fixe. Elles peuvent en outre apparaître dans certains stades critiques de fonctionnement de 1' installation.Such droplets at the outlet of the evaporator conventionally appear when the expansion member is a variable or fixed calibrated orifice. They may also appear in certain critical stages of operation of the installation.

Dans des boucles de climatisation connus, de tels séparateurs de phases sont volumineux et augmentent sensiblement l'encombrement et le poids de l'installation de climatisation. Ils ne permettent pas d'optimiser l'espace occupé par l'installation de climatisation dans le véhicule. Par ailleurs de tels séparateurs augmentent significàtivement le coût d'une installation de climatisation pour véhicule.In known air conditioning loops, such phase separators are bulky and significantly increase the size and weight of the air conditioning installation. They do not make it possible to optimize the space occupied by the air conditioning installation in the vehicle. Furthermore, such separators significantly increase the cost of an air conditioning installation for a vehicle.

C'est un but de la présente invention de proposer une boucle de climatisation capable de limiter l'aspiration de liquide par le compresseur, par des moyens simples et économiques.It is an object of the present invention to provide an air conditioning loop capable of limiting the suction of liquid by the compressor, by simple and economical means.

C'est encore un but de l'invention de proposer une telle boucle de climatisation ayant un encombrement et un poids réduit, pour pallier le manque de place fréquent dans la construction automobile.It is also an object of the invention to provide such an air conditioning loop having a space requirement and a reduced weight, in order to compensate for the frequent lack of space in automobile construction.

L'invention propose, à cet effet, une boucle de fluide réfrigérant, notamment pour une installation de climatisation de véhicule, comprenant un compresseur propre à élever la pression du fluide à l'état gazeux, un condenseur propre à faire passer le fluide comprimé par le compresseur à l'état liquide, un organe de détente propre à abaisser la pression du fluide condensé par le condenseur et un évaporateur propre à faire passer le fluide détendu à l'état gazeux avant son retour dans le compresseur, ainsi que des moyens, disposé entre l'évaporateur et le compresseur, pour éviter l'entrée de liquide dans le compresseur. La boucle comprend également un premier conduit reliant la • sortie du compresseur à l'entrée du condenseur. Avantageusement, les moyens pour éviter l'entrée de liquide dans le compresseur comprennent un boîtier, dans lequel le fluide en provenance de l'évaporateur circule vers le compresseur, tandis que le boîtier est conformé pour loger une partie du premier conduit, ladite partie, dite capillaire étant de diamètre inférieur à 8 millimètres.The invention proposes, for this purpose, a coolant loop, in particular for a vehicle air conditioning installation, comprising a compressor capable of raising the pressure of the fluid to the gaseous state, a condenser capable of passing the compressed fluid through the compressor in the liquid state, an expansion member capable of lowering the pressure of the fluid condensed by the condenser and an evaporator capable of passing the expanded fluid to the gaseous state before its return to the compressor, as well as means, placed between the evaporator and the compressor, to prevent liquid from entering the compressor. The loop also includes a first conduit connecting the outlet of the compressor • the condenser inlet. Advantageously, the means for preventing the entry of liquid into the compressor comprise a housing, in which the fluid coming from the evaporator circulates towards the compressor, while the housing is shaped to house part of the first conduit, said part, called capillary, having a diameter of less than 8 millimeters.

Selon une caractéristique de l'invention, le fluide en provenance de l'évaporateur vers le compresseur circule dans le boîtier selon une direction longitudinale sensiblement horizontale.According to a characteristic of the invention, the fluid coming from the evaporator towards the compressor circulates in the housing in a substantially horizontal longitudinal direction.

Selon une autre caractéristique de l'invention, les moyens pour éviter l'entrée de liquide dans le compresseur comprennent un boîtier, limité par une paroi latérale de révolution, d'axe sensiblement horizontal, une première paroi d'extrémité raccordée par un conduit à la sortie de l'évaporateur et une deuxième paroi d'extrémité, raccordée par un conduit à l'entrée du compresseur, ladite paroi délimitant le volume intérieur des dits moyens.According to another characteristic of the invention, the means for preventing the entry of liquid into the compressor comprise a housing, limited by a side wall of revolution, of substantially horizontal axis, a first end wall connected by a conduit to the outlet of the evaporator and a second end wall, connected by a conduit to the inlet of the compressor, said wall defining the interior volume of said means.

Dans une forme de réalisation particulière, la paroi latérale du boîtier est sensiblement cylindrique.In a particular embodiment, the side wall of the housing is substantially cylindrical.

Les parois desdits moyens comportent deux ouvertures, ces deux ouvertures permettant l'entrée et la sortie du capillaire dans le boîtier.The walls of said means have two openings, these two openings allowing the capillary to enter and exit into the housing.

Avantageusement, la longueur du capillaire est supérieure à la longueur de la paroi du boîtier.Advantageously, the length of the capillary is greater than the length of the wall of the housing.

La longueur du capillaire (8) est notamment inférieure -à 1 mètre.The length of the capillary (8) is notably less than 1 meter.

En complément, le capillaire est sensiblement en forme d'hélice.In addition, the capillary is substantially in the form of a helix.

Le capillaire peut en outre comporter des ailettes sur sa paroi extérieure. Selon une autre caractéristique de l'invention, le capillaire est réalisé en matériau inoxydable.The capillary can also have fins on its outer wall. According to another characteristic of the invention, the capillary is made of stainless material.

En variante, le capillaire est réalisé en aluminium ou en alliage d'aluminium.Alternatively, the capillary is made of aluminum or an aluminum alloy.

En complément, la boucle comprend un réservoir propre à absorber les variations de volume du fluide.In addition, the loop includes a reservoir capable of absorbing variations in the volume of the fluid.

Le réservoir peut être placé entre la sortie du condenseur et l'entrée de l'organe de détente.The reservoir can be placed between the outlet of the condenser and the inlet of the expansion member.

En variante, le réservoir est intégré au condenseur, celui-ci comportant une zone de sous-refroidissement en aval du réservoir.As a variant, the reservoir is integrated into the condenser, the latter comprising a sub-cooling zone downstream of the reservoir.

Selon un autre aspect de l'invention, l'organe de détente est sous la forme d'un orifice calibré.According to another aspect of the invention, the expansion member is in the form of a calibrated orifice.

D'autres caractéristiques et avantages de l'invention apparaîtront à l'examen de la description détaillée ci-après, et des dessins annexés sur lesquels:Other characteristics and advantages of the invention will appear on examining the detailed description below, and the attached drawings in which:

- la figure 1 est une vue d'ensemble d'une boucle de climati- sation d'une installation de climatisation de véhicule, selon une réalisation de l'art antérieur,FIG. 1 is an overall view of an air conditioning loop of a vehicle air conditioning installation, according to an embodiment of the prior art,

- la figure 2 représente un schéma d'une boucle de climatisation de l'art antérieur comportant un séparateur de phases, -la figure 3 représente un schéma d'une boucle de climatisa- tion, selon une forme de réalisation de l'invention,FIG. 2 represents a diagram of an air conditioning loop of the prior art comprising a phase separator, FIG. 3 represents a diagram of an air conditioning loop, according to an embodiment of the invention,

- la figure 4 est une vue en coupe axiale du dispositif de vaporisation, selon cette forme de réalisation,FIG. 4 is a view in axial section of the vaporization device, according to this embodiment,

- la figure 5 représente un schéma d'une boucle de climatisation, selon une autre forme de réalisation de l'invention, et - la figure 6 est une vue en coupe axiale du dispositif de vaporisation, selon cette autre forme de réalisation. Les dessins contiennent, pour l'essentiel, des éléments de caractère certain. Ils pourront donc non seulement servir à mieux faire comprendre la description, mais aussi contribuer à la définition de l'invention, le cas échéant.- Figure 5 shows a diagram of an air conditioning loop, according to another embodiment of the invention, and - Figure 6 is an axial sectional view of the vaporization device, according to this other embodiment. The drawings essentially contain elements of a certain character. They can therefore not only serve to better understand the description, but also contribute to the definition of the invention, if necessary.

On se réfère tout d'abord à la figure 1 qui représente une vue d'ensemble d'une boucle de climatisation intégrée à un véhicule. La boucle de climatisation est parcourue par une fluide réfrigérant, par exemple le fluide réfrigérant R134a. La boucle de climatisation comprend un compresseur 1, un condenseur 2, un réservoir de liquide 3, un organe de détente 4 et un évaporateur 5, parcourus dans cet ordre par le fluide réfrigérant, et reliés entre eux par un ensemble de conduits.We first refer to Figure 1 which shows an overview of an air conditioning loop integrated into a vehicle. The air conditioning loop is traversed by a refrigerant, for example R134a refrigerant. The air conditioning loop comprises a compressor 1, a condenser 2, a liquid tank 3, an expansion member 4 and an evaporator 5, traversed in this order by the refrigerant, and connected together by a set of conduits.

L' ensemble de conduits comprend un premier conduit 91 reliant la sortie du compresseur à l'entrée du condenseur, un deuxième conduit 92 reliant la sortie de l'évaporateur à l'entrée du compresseur, un troisième conduit 93 reliant la sortie du condenseur à l'entrée du réservoir de liquide et' un quatrième conduit 94 reliant le réservoir de liquide à l'organe de détente.The set of conduits comprises a first conduit 91 connecting the outlet of the compressor to the inlet of the condenser, a second conduit 92 connecting the outlet of the evaporator to the inlet of the compressor, a third conduit 93 connecting the outlet of the condenser to the inlet of the liquid container and a fourth conduit 94 connecting the liquid reservoir to the expansion member.

Dans une' autre forme de réalisation connue, le réservoir de liquide 3 peut être intégré au condenseur 2, auquel cas le troisième conduit 930 relie la sortie du condenseur à l'organe de détente et le quatrième conduit 940 relie l'organe de détente à l'entrée de l'évaporateur. Cette forme de réalisation est illustrée sur la figure 2. -In another known embodiment, the liquid reservoir 3 can be integrated into the condenser 2, in which case the third conduit 930 connects the outlet of the condenser to the expansion member and the fourth conduit 940 connects the expansion member to the inlet of the evaporator. This embodiment is illustrated in Figure 2. -

Le fluide réfrigérant circulant dans l'ensemble de conduits de la figure 1 subit une élévation de pression et de température dans le compresseur 1. Le fluide est ensuite transformé en phase liquide à haute pression par le condenseur 2. L'organe de détente 4 abaisse la pression créée par le compresseur. L'organe de détente peut être un orifice calibré ou un détendeur, par exemple un détendeur thermostatique. La description sera faite ci-après en référence à un. orifice calibré, à titre d'exemple, non limitatif. En sortie de l'orifice calibré, le fluide réfrigérant se présente sous la forme d'un mélange de vapeur et de liquide à basse pression. Ce mélange arrive alors dans l'évaporateur 5 qui provoque l' évaporation du liquide en prélevant la "chaleur d'un flux d'air 51. Le condenseur 2 reçoit un flux d'air extérieur 21 pour évacuer cette chaleur ainsi que la chaleur produite par la compression du fluide.The refrigerant circulating in the set of conduits of FIG. 1 undergoes a rise in pressure and temperature in the compressor 1. The fluid is then transformed into the liquid phase at high pressure by the condenser 2. The expansion member 4 lowers the pressure created by the compressor. The expansion member can be a calibrated orifice or a regulator, for example a thermostatic regulator. The description will be made below with reference to a. calibrated orifice, by way of example, not limiting. At the outlet of the calibrated orifice, the refrigerant is in the form of a mixture of vapor and liquid at low pressure. This mixture then arrives in the evaporator 5 which causes the liquid to evaporate by removing the " heat from an air flow 51. The condenser 2 receives an external air flow 21 to evacuate this heat as well as the heat produced by compression of the fluid.

On se réfère maintenant à la figure 2 qui est une vue schématique de la boucle de climatisation de l'art antérieur, décrite ci-avant. Cette boucle de climatisation comprend un séparateur de phase 6 placé entre l'évaporateur et le compresseur sur le conduit 92. Ce séparateur de phase est destiné à empêcher l'absorption de gouttelettes de liquide par le compresseur, éventuellement transmises par l'évapora- teur 5.Referring now to Figure 2 which is a schematic view of the air conditioning loop of the prior art, described above. This air conditioning loop includes a phase separator 6 placed between the evaporator and the compressor on the duct 92. This phase separator is intended to prevent absorption of liquid droplets by the compressor, possibly transmitted by the evaporator 5.

Le séparateur de phases 6 se présente sous forme d'un réservoir propre à séparer la phase liquide de la phase vapeur du fluide réfrigérant qui circule entre l'évaporateur et le compresseur. Il permet de ne transmettre que la phase vapeur au compresseur. La phase liquide, qui est envoyée au fond du séparateur de phases, peut être vaporisée par apport extérieur de chaleur pour être à son tour transmise au compresseur.The phase separator 6 is in the form of a tank capable of separating the liquid phase from the vapor phase of the refrigerant which circulates between the evaporator and the compressor. It only transmits the vapor phase to the compressor. The liquid phase, which is sent to the bottom of the phase separator, can be vaporized by external heat supply to be in turn transmitted to the compressor.

La Demanderesse a mis en place une boucle de climatisation permettant de simplifier ce fonctionnement, tout en conservant des performances satisfaisantes.The Applicant has set up an air conditioning loop making it possible to simplify this operation, while retaining satisfactory performance.

Pour cela, l'invention propose une boucle de climatisation dans laquelle l'élimination du liquide est réalisée par échange thermique entre une partie de la zone haute pression HP de la boucle et une partie de la zone basse pression BP. En référence à la figure 2, la zone haute pression est située au-dessus de la ligne en traits mixtes et la zone basse pression au-dessous de la ligne en traits mixtes.For this, the invention provides an air conditioning loop in which the elimination of the liquid is carried out by heat exchange between part of the high pressure zone HP of the loop and part of the low pressure zone BP. Referring to Figure 2, the high pressure area is located above the dashed line and the low pressure area below the dashed line.

On se réfère maintenant à la figure 3. La boucle de climatisation selon l'invention comprend un moyen pour éviter l'entrée de liquide dans le compresseur, dit dispositif de vaporisation 78, disposé entre la sortie de l'évaporateur 5 et l'entrée du compresseur 1. Le dispositif de vaporisation 78 comprend un boîtier de forme cylindrique de révolution, propre à recevoir le fluide à basse pression provenant de l'évaporateur 5 et comportant d'éventuelles gouttelettes de liquide, et à transmettre le fluide au compresseur 1 après traitement. Le boîtier 7 du dispositif de vaporisation est traversée par le conduit 91 reliant la sortie du compresseur 1 à l'entrée du condenseur 2. Plus précisément, la partie 8 du premier conduit logée dans le boîtier est un conduit de petit diamètre, dit capillaire. Le diamètre du capillaire est avantageusement inférieur à 8 millimètres.Referring now to Figure 3. The air conditioning loop according to the invention comprises a means for preventing the entry of liquid into the compressor, said vaporization device 78, disposed between the outlet of the evaporator 5 and the inlet of the compressor 1. The vaporization device 78 comprises a housing of cylindrical shape of revolution, suitable for receiving the low pressure fluid coming from the evaporator 5 and comprising possible droplets of liquid, and for transmitting the fluid to the compressor 1 after treatment. The housing 7 of the vaporization device is traversed by the conduit 91 connecting the outlet of the compressor 1 to the inlet of the condenser 2. More specifically, the part 8 of the first conduit housed in the housing is a conduit of small diameter, called capillary. The diameter of the capillary is advantageously less than 8 millimeters.

Cette conformation particulière permet de remplacer le dispositif de vaporisation de l'art antérieur en vaporisant les gouttelettes de liquide éventuellement présentes dans le fluide en provenance de l'évaporateur 5.This particular configuration makes it possible to replace the vaporization device of the prior art by vaporizing the droplets of liquid possibly present in the fluid coming from the evaporator 5.

En outre, cette conformation permet d'effectuer un abaissement de température dans le capillaire et donc une pré-détente.In addition, this conformation makes it possible to effect a temperature reduction in the capillary and therefore pre-expansion.

En référence à la figure 4, le boîtier 7 du séparateur de phase est orienté horizontalement et est limité par une paroi latérale cylindrique 72, et deux parois d'extrémité 70 et 71. La paroi d'extrémité 70 est raccordée de manière étanche à la sortie de l'évaporateur par la partie 920 du deuxième conduit 92. La paroi d'extrémité 71 est raccordée de manière étanche à l'entrée du compresseur par la partie 921 du deuxième conduit 92.With reference to FIG. 4, the housing 7 of the phase separator is oriented horizontally and is limited by a cylindrical side wall 72, and two end walls 70 and 71. The end wall 70 is tightly connected to the outlet of the evaporator via part 920 of the second duct 92. The end wall 71 is tightly connected to the inlet of the compressor by the part 921 of the second duct 92.

Par ailleurs, la paroi du boîtier du dispositif de vaporisation comprend une première ouverture 80, réalisée par exemple sur la paroi l'extrémité 70, et une deuxième ouverture 81, réalisée par exemple sur la paroi d'extrémité 71. La deuxième ouverture 81 est située entre la première ouverture 80 et l'extrémité du boîtier 7, délimitée par la paroi d'extrémité 71.Furthermore, the wall of the housing of the vaporization device comprises a first opening 80, produced for example on the wall the end 70, and a second opening 81, produced for example on the end wall 71. The second opening 81 is located between the first opening 80 and the end of the housing 7, delimited by the end wall 71.

Dans une forme de réalisation, le capillaire en provenance de la sortie du compresseur est introduit par l'ouverture 81 et ressort par l'ouverture 80 vers l'entrée du condenseur. Le capillaire est soudé au boîtier au niveau de ces ouvertures par des techniques connues de 1-' homme du métier.In one embodiment, the capillary from the outlet of the compressor is introduced through the opening 81 and exits through the opening 80 towards the inlet of the condenser. The capillary is welded to the housing at these openings by techniques known to those skilled in the art.

Ainsi, le capillaire 8 est logé dans le boîtier 7 du dispositif de vaporisation.Thus, the capillary 8 is housed in the housing 7 of the vaporization device.

Le capillaire 8 du dispositif de vaporisation 78 a' une longueur supérieure à la longueur du boîtier. Dans une réalisation avantageuse cette longueur est inférieure à 1 mètre.The capillary 8 of the vaporization device 78 has a length greater than the length of the housing. In an advantageous embodiment, this length is less than 1 meter.

En particulier, le capillaire 8 a une forme d'hélice, afin de loger une longueur importante du capillaire dans le boîtier.In particular, the capillary 8 has a helical shape, in order to accommodate a large length of the capillary in the housing.

Le fluide réfrigérant circule dans le capillaire 8 dans le sens compresseur/condenseur. Ce sens de circulation est indiqué par les flèches en traits interrompus sur la figure-. La compression dans le compresseur 1 a permis au fluide d'atteindre une pression et une température élevées, et par suite le fluide qui traverse le capillaire est également à pression et température élevées. Par ailleurs, le fluide circule dans le boîtier, à l'extérieur du capillaire, dans le sens évaporateur/compresseur, comme indiqué par les flèches en trait plein. Le fluide sortant de l'évaporateur se trouve à basse pression et à basse température.The refrigerant circulates in the capillary 8 in the compressor / condenser direction. This direction of circulation is indicated by the arrows in broken lines in the figure-. The compression in compressor 1 has allowed the fluid to reach a high pressure and temperature, and therefore the fluid passing through the capillary is also at high pressure and temperature. In addition, the fluid circulates in the housing, outside the capillary, in the evaporator / compressor direction, as indicated by the arrows in solid line. The fluid leaving the evaporator is at low pressure and at low temperature.

Dans la forme de réalisation de la figure 3, le fluide qui circule dans le boîtier, à l'extérieur du capillaire, et le fluide qui circule dans le capillaire sont à contre-courant.In the embodiment of Figure 3, the fluid flowing in the housing, outside the capillary, and the fluid flowing in the capillary are counter-current.

La différence de température entre le fluide qui circule dans le capillaire 8 et le fluide qui circule à l'extérieur du capillaire dans le boîtier favorise un échange thermique. Cet échange thermique est apte à vaporiser les gouttelettes de liquide éventuellement présentes dans le fluide qui circule dans le deuxième conduit, à l'extérieur du capillaire 40. Il permet donc d' alimenter le compresseur uniquement en fluide réfrigérant gazeux et de s'affranchir de l'utilisation d'un dispositif de vaporisation trop volumineux.The temperature difference between the fluid flowing in the capillary 8 and the fluid flowing outside the capillary in the housing promotes heat exchange. This heat exchange is able to vaporize the droplets of liquid possibly present in the fluid which circulates in the second conduit, outside the capillary 40. It therefore makes it possible to supply the compressor only with gaseous refrigerant and to dispense with the use of an oversized spray device.

Le capillaire peut être conformé pour favoriser l'échange thermique. Il peut comporter par exemple de petites ailettes qui augmentent la dissipation thermique.The capillary can be shaped to promote heat exchange. It may for example include small fins which increase the heat dissipation.

En outre, l'utilisation d'un capillaire entre le compresseur et le condenseur permet un abaissement de la pression, complémentaire à la détente réalisée -au niveau de l'orifice calibré. Il s'ensuit un meilleur contrôle de la température de refoulement et de la haute pression.In addition, the use of a capillary between the compressor and the condenser allows a lowering of the pressure, complementary to the expansion carried out at the calibrated orifice. This results in better control of the discharge temperature and the high pressure.

Les figures 5 et 6 illustrent une deuxième forme de réalisation de l'invention. Dans cette forme de réalisation, le capillaire en provenance de la sortie du condenseur 2 est introduit dans l'ouverture 80 et ressort par l'ouverture 81. Par suite, le fluide réfrigérant qui circule dans le boîtier 7 à l'extérieur du capillaire 8 et le fluide réfrigérant qui circule dans le capillaire 8 ont un même sens de circulation.Figures 5 and 6 illustrate a second embodiment of the invention. In this embodiment, the capillary coming from the outlet of the condenser 2 is introduced into the opening 80 and exits through the opening 81. Consequently, the refrigerant which circulates in the housing 7 outside the capillary 8 and the refrigerant which circulates in the capillary 8 have the same direction of circulation.

Dans les deux formes de réalisation, la boucle de climatisation comprend également un réservoir de liquide 3 propre à absorber les variations de volume du fluide.In the two embodiments, the air conditioning loop also comprises a liquid reservoir 3 capable of absorbing variations in the volume of the fluid.

Le réservoir de liquide peut être placé entre le condenseur et l'orifice calibré.The liquid tank can be placed between the condenser and the calibrated orifice.

Avantageusement, on peut utiliser un condenseur comportant un réservoir de liquide intégré et une zone de sous-refroidissement.Advantageously, one can use a condenser comprising an integrated liquid reservoir and a sub-cooling zone.

Le capillaire 8 du dispositif de vaporisation 78 est immergé dans le fluide qui circule dans le boîtier et est donc susceptible de subir une oxydation. Pour éviter cette oxydation et l'usure qui en résulte, le capillaire 8 est réalisé à partir de matériau inoxydable, en particulier en aluminium ou en alliage d'aluminium.The capillary 8 of the vaporization device 78 is immersed in the fluid which circulates in the housing and is therefore liable to undergo oxidation. To avoid this oxidation and the wear which results therefrom, the capillary 8 is produced from stainless material, in particular aluminum or aluminum alloy.

Le dispositif de vaporisation 78 permet donc de réaliser la fonction d' évaporation des gouttelettes de liquides éventuel- lement présentes en sortie de l'évaporateur, tout en assurant- une fonction de pré-détente. En utilisant en outre un condenseur à bouteille intégrée, la boucle de climatisation fournit une réserve de liquide et une filtration efficace.The vaporization device 78 therefore makes it possible to carry out the function of evaporation of the droplets of liquids possibly present at the outlet of the evaporator, while ensuring a pre-expansion function. In addition, using an integrated bottle condenser, the air conditioning loop provides a liquid reserve and efficient filtration.

L'encombrement de la boucle de climatisation est également amélioré. Le séparateur de phase est formé d'un simple boîtier et d'un capillaire. Il ne contient aucun organe mécanique et ne nécessite aucun réglage. De plus, l'encombrement est amélioré par l'imbrication d'une partie du premier conduit 91 dans le boîtier qui est placé sur le deuxième conduit 92. Cette réduction de l'encombrement de la boucle de climatisation est particulièrement intéressante pour les installations de climatisation de véhicules à moteur qui sont logées dans des compartiments moteur de plus en plus petits .The size of the air conditioning loop is also improved. The phase separator consists of a simple housing and a capillary. It contains no mechanical parts and requires no adjustment. In addition, the overall size is improved by nesting part of the first conduit 91 in the housing which is placed on the second conduit 92. This reduction in the overall dimensions of the air conditioning loop is particularly advantageous for air conditioning installations of motor vehicles which are housed in increasingly smaller engine compartments.

La structure simple du capillaire, sa fiabilité et sa tenue dans le temps garantissent un coût de revient extrêmement faible et des performances élevées.The simple structure of the capillary, its reliability and its resistance over time guarantee an extremely low cost price and high performance.

Bien entendu, l'invention n'est pas limitée aux formes de réalisation décrites précédemment à titre d'exemple et s'étend à d'autres variantes, notamment en ce qui concerne le choix de la longueur du capillaire. Par exemple, pour optimiser la longueur du capillaire,. l'invention peut utiliser une relation liant cette longueur au diamètre du capillaire. Une telle relation dépend des paramètres suivants:Of course, the invention is not limited to the embodiments described above by way of example and extends to other variants, in particular as regards the choice of the length of the capillary. For example, to optimize the length of the capillary ,. the invention can use a relation linking this length to the diameter of the capillary. Such a relationship depends on the following parameters:

-La quantité de chaleur à échanger entre le fluide circulant dans le capillaire et le fluide circulant dans le boîtier, -le débit de fluide dans le capillaire et le débit de fluide dans le boîtier,-The quantity of heat to be exchanged between the fluid circulating in the capillary and the fluid circulating in the housing, -the flow of fluid in the capillary and the flow of fluid in the housing,

-la température de l'environnement de la boucle de climatisation, -la température du fluide, -la matière du capillaire (par exemple l'aluminium),-the temperature of the environment of the air conditioning loop, -the temperature of the fluid, -the material of the capillary (for example aluminum),

-la forme générale du capillaire (par exemple, section circulaire ou carrée), et-the general shape of the capillary (for example, circular or square section), and

-le rayon de courbure du capillaire à l'intérieur du boîtier.-the radius of curvature of the capillary inside the housing.

En outre, l'invention n'est pas limitée à un boîtier de forme cylindrique. En variante, d'autres formes peuvent être envisagées.Furthermore, the invention is not limited to a cylindrical case. As a variant, other forms can be envisaged.

L'invention n'est pas non plus limitée à un organe de détente de type orifice calibré. D'autres types d'organes de détente peuvent être utilisés, comme par exemple un détendeur thermostatique. The invention is also not limited to an expansion member of the calibrated orifice type. Other types of trigger devices can be used, such as a thermostatic expansion valve.

Claims

Revendications claims 1. Boucle de fluide réfrigérant, notamment pour une installation de climatisation de véhicule, comprenant un compresseur (1) propre à élever la pression du fluide à l'état gazeux, un condenseur (2) propre à faire passer le fluide comprimé par le compresseur à l'état liquide, un organe de détente (4) propre à abaisser la pression du fluide condensé par le condenseur et un évaporateur (5) propre à faire passer le fluide détendu à l'état gazeux avant son retour dans le compresseur, ainsi que des moyens (78), disposé entre l'évaporateur et le compresseur, pour éviter l'entrée de liquide dans le compresseur, la boucle comprenant un premier conduit (91) reliant la sortie du compresseur à l'entrée du condenseur, caractérisée en ce que lesdits moyens (78) comprennent un boîtier, dans lequel le fluide en provenance de l'évaporateur circule vers le compresseur, et en ce que le boîtier est conformé pour loger une partie (8) du premier conduit, ladite partie, dite capillaire étant de diamètre inférieur à 8 millimètres.1. Refrigerant fluid loop, in particular for a vehicle air conditioning installation, comprising a compressor (1) capable of raising the pressure of the fluid in the gaseous state, a condenser (2) capable of passing the compressed fluid through the compressor in the liquid state, an expansion member (4) capable of lowering the pressure of the fluid condensed by the condenser and an evaporator (5) capable of passing the expanded fluid to the gaseous state before returning to the compressor, thus that means (78), disposed between the evaporator and the compressor, for preventing the entry of liquid into the compressor, the loop comprising a first conduit (91) connecting the outlet of the compressor to the inlet of the condenser, characterized in that said means (78) comprise a housing, in which the fluid coming from the evaporator circulates towards the compressor, and in that the housing is shaped to accommodate a part (8) of the first duct, said part, called ca capillary being less than 8 millimeters in diameter. 2. Boucle selon la revendication 1, caractérisée en ce que le fluide en provenance de l'évaporateur vers le compresseur circule dans le boîtier (7) selon une direction longitudinale sensiblement horizontale.2. Loop according to claim 1, characterized in that the fluid from the evaporator to the compressor flows in the housing (7) in a substantially horizontal longitudinal direction. 3. Boucle selon la revendication 2, caractérisée en ce que le boîtier (7) est limité par une paroi latérale de révolution (72), d'axe sensiblement horizontal, une première paroi d'extrémité (71) raccordée par un conduit à la sortie de l'évaporateur et une deuxième paroi d'extrémité (70), raccordée par un conduit à l'entrée du compresseur, ladite paroi délimitant le volume intérieur du dispositif de vaporisation. 3. Buckle according to claim 2, characterized in that the housing (7) is limited by a lateral wall of revolution (72), of substantially horizontal axis, a first end wall (71) connected by a conduit to the outlet of the evaporator and a second end wall (70), connected by a conduit to the inlet of the compressor, said wall defining the interior volume of the vaporization device. 4. Boucle selon la revendication 3, caractérisée en ce que la paroi latérale (72) du boîtier (7) est sensiblement cylindrique.4. Buckle according to claim 3, characterized in that the side wall (72) of the housing (7) is substantially cylindrical. 5. Boucle selon la revendication 4, caractérisée en ce que les parois comportent deux ouvertures (80,81), ces deux ouvertures permettant l'entrée et la sortie du capillaire (8) dans le boîtier (7).5. Buckle according to claim 4, characterized in that the walls have two openings (80,81), these two openings allowing the entry and exit of the capillary (8) in the housing (7). 6. Boucle selon l'une des revendications précédentes, caractérisée en ce que la longueur du capillaire (8) est supérieure à la longueur du boîtier (7) .6. Buckle according to one of the preceding claims, characterized in that the length of the capillary (8) is greater than the length of the housing (7). 7. Boucle selon la revendication 6, caractérisée en ce que la longueur du capillaire (8) est inférieure à 1 mètre.7. Buckle according to claim 6, characterized in that the length of the capillary (8) is less than 1 meter. 8. Boucle selon l'une des revendications précédentes, caractérisée en ce que le capillaire (8) est sensiblement en forme d'hélice.8. Buckle according to one of the preceding claims, characterized in that the capillary (8) is substantially in the form of a helix. 9. Boucle selon l'une des revendications précédentes, caractérisée en ce que le capillaire (8) comporte des ailettes sur sa paroi extérieure.9. Buckle according to one of the preceding claims, characterized in that the capillary (8) has fins on its outer wall. 10. Boucle selon l'une des revendications précédentes, caractérisée en ce que le capillaire (8) est réalisé en matériau inoxydable.10. Buckle according to one of the preceding claims, characterized in that the capillary (8) is made of stainless material. 11. Boucle selon l'une des revendications 1 à 9, caractérisée en ce que le capillaire (8) est réalisé en aluminium ou en alliage d'aluminium.11. Buckle according to one of claims 1 to 9, characterized in that the capillary (8) is made of aluminum or aluminum alloy. 12. Boucle selon l'une des revendications précédentes, caractérisée en ce qu'elle comprend un réservoir (3) propre à absorber les variations de volume du fluide. 12. Buckle according to one of the preceding claims, characterized in that it comprises a reservoir (3) capable of absorbing variations in the volume of the fluid. 13. Boucle selon la revendication 12, caractérisée en ce que le réservoir est placé entre la sortie du condenseur (2) et l'entrée de l'organe de détente (4).13. Buckle according to claim 12, characterized in that the reservoir is placed between the outlet of the condenser (2) and the inlet of the expansion member (4). 14. Boucle selon la revendication 12, caractérisée en ce que le réservoir (3) est intégré au condenseur, celui-ci comportant une zone de sous-refroidissement en aval du réservoir.14. A loop according to claim 12, characterized in that the reservoir (3) is integrated into the condenser, the latter comprising a sub-cooling zone downstream of the reservoir. 15. Boucle selon l'une des revendications précédentes, caractérisée en ce que l'organe de détente (4) est sous la forme d'un orifice calibré. 15. Buckle according to one of the preceding claims, characterized in that the expansion member (4) is in the form of a calibrated orifice.
PCT/FR2003/001781 2002-06-14 2003-06-13 Vaporizing device for air conditioning loop Ceased WO2003106901A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003260586A AU2003260586A1 (en) 2002-06-14 2003-06-13 Vaporizing device for air conditioning loop

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0207365A FR2840975B1 (en) 2002-06-14 2002-06-14 VAPORIZATION DEVICE FOR AIR CONDITIONING LOOP
FR02/07365 2002-06-14

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WO2003106901A1 true WO2003106901A1 (en) 2003-12-24

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Application Number Title Priority Date Filing Date
PCT/FR2003/001781 Ceased WO2003106901A1 (en) 2002-06-14 2003-06-13 Vaporizing device for air conditioning loop

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AU (1) AU2003260586A1 (en)
FR (1) FR2840975B1 (en)
WO (1) WO2003106901A1 (en)

Cited By (1)

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EP1840487A1 (en) * 2006-03-31 2007-10-03 Aro Tubi Trafilerie S.P.A. Endless capillary tubes in aluminium alloy, lamination valves comprising aluminium alloy capillary tubes and an aluminium alloy

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Publication number Priority date Publication date Assignee Title
BRPI1101032A2 (en) * 2011-03-15 2015-06-16 Whirlpool Sa Expansion device of a cooling system

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GB934490A (en) * 1959-11-20 1963-08-21 Denco Miller Ltd Improvements in refrigeration equipment
US5377501A (en) * 1990-05-25 1995-01-03 Environmental Products Amalgamated Pty Ltd Oil separator for conditioning recovered refrigerant
US5622055A (en) * 1995-03-22 1997-04-22 Martin Marietta Energy Systems, Inc. Liquid over-feeding refrigeration system and method with integrated accumulator-expander-heat exchanger
EP0779481A2 (en) * 1995-12-15 1997-06-18 Showa Aluminum Corporation Refrigeration cycle system
NL1004208C2 (en) * 1996-10-04 1998-04-07 Imperator Engineering & Consul Cooling system for large quantity of fruit esp. ripening bananas

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Publication number Priority date Publication date Assignee Title
GB934490A (en) * 1959-11-20 1963-08-21 Denco Miller Ltd Improvements in refrigeration equipment
US5377501A (en) * 1990-05-25 1995-01-03 Environmental Products Amalgamated Pty Ltd Oil separator for conditioning recovered refrigerant
US5622055A (en) * 1995-03-22 1997-04-22 Martin Marietta Energy Systems, Inc. Liquid over-feeding refrigeration system and method with integrated accumulator-expander-heat exchanger
EP0779481A2 (en) * 1995-12-15 1997-06-18 Showa Aluminum Corporation Refrigeration cycle system
NL1004208C2 (en) * 1996-10-04 1998-04-07 Imperator Engineering & Consul Cooling system for large quantity of fruit esp. ripening bananas

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1840487A1 (en) * 2006-03-31 2007-10-03 Aro Tubi Trafilerie S.P.A. Endless capillary tubes in aluminium alloy, lamination valves comprising aluminium alloy capillary tubes and an aluminium alloy

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AU2003260586A1 (en) 2003-12-31
FR2840975B1 (en) 2005-01-14
FR2840975A1 (en) 2003-12-19

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