EP2199708B1 - Combined device comprising an internal heat exchanger and an accumulator participating to an AC loop, the combined device being equipped with a multi-functions internal component. - Google Patents

Combined device comprising an internal heat exchanger and an accumulator participating to an AC loop, the combined device being equipped with a multi-functions internal component. Download PDF

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Publication number
EP2199708B1
EP2199708B1 EP09178157A EP09178157A EP2199708B1 EP 2199708 B1 EP2199708 B1 EP 2199708B1 EP 09178157 A EP09178157 A EP 09178157A EP 09178157 A EP09178157 A EP 09178157A EP 2199708 B1 EP2199708 B1 EP 2199708B1
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EP
European Patent Office
Prior art keywords
wall
combined device
heat exchanger
internal
confinement
Prior art date
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Application number
EP09178157A
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German (de)
French (fr)
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EP2199708A1 (en
Inventor
Jimmy Lemee
Christophe Denoual
Alain Pourmarin
Eric Goyer
Michel Meiche
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 Systemes Thermiques SAS
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Valeo Systemes Thermiques SAS
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Publication of EP2199708A1 publication Critical patent/EP2199708A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • 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
    • F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
    • 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
    • F25B37/00—Absorbers; Adsorbers
    • 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
    • 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
    • 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
    • F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/04—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being spirally coiled
    • 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
    • F25B2400/02—Centrifugal separation of gas, liquid or oil
    • 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

Definitions

  • the present invention is in the field of air conditioning loops cooperating with a ventilation system, heating and / or air conditioning of a motor vehicle. It relates to a combined device associating an internal heat exchanger and a participating accumulator of such a loop. Finally, it relates to an air conditioning loop comprising such a combined device.
  • a motor vehicle is commonly equipped with a ventilation, heating and / or air conditioning system to regulate the aerothermal parameters of the air contained inside the passenger compartment of the vehicle.
  • the installation consists mainly of a plastic housing that is housed under a dashboard of the vehicle. The housing channels the circulation of at least one air flow prior to the delivery of the latter inside the passenger compartment.
  • Such an installation cooperates with an air conditioning loop to cool the air flow prior to the evacuation of the latter out of the housing to the passenger compartment.
  • Said loop comprises a plurality of elements inside which circulates successively a cooling fluid, such as a supercritical fluid, carbon dioxide known under the reference R744 in particular.
  • a cooling fluid such as a supercritical fluid, carbon dioxide known under the reference R744 in particular.
  • These elements comprise at least one compressor, a gas cooler, an internal heat exchanger, an expansion member, an evaporator and an accumulator.
  • the refrigerant flows from the compressor to the gas cooler, then through a "high pressure” branch of the heat exchanger internal, then to the expansion member, then through the evaporator, then to the accumulator, and finally through a branch “low pressure” of the internal heat exchanger, to return to the compressor.
  • the compressor is intended to receive the refrigerant fluid in the gaseous state and to compress it to carry it at high pressure.
  • the gas cooler is adapted to cool the compressed refrigerant at a relatively constant pressure, giving up heat to its environment.
  • the expansion member is able to lower the pressure of the refrigerant leaving the gas cooler by bringing it at least partly in the liquid state.
  • the evaporator is itself capable of passing the coolant in the liquid state from the expansion element, at relatively constant pressure, to the gaseous state, by taking heat from said air flow which passes through the 'evaporator. The vaporized refrigerant is then sucked by the compressor.
  • the accumulator provides a separation function between a gaseous phase and a liquid phase of the refrigerant.
  • the accumulator comprises a separation zone inside which said phases dissociate from one another by gravity.
  • the accumulator also provides a storage function for a circulating coolant charge depending on the conditions of use of the air conditioning loop.
  • the accumulator comprises a refrigerant storage zone in the liquid state that the accumulation zone collects from the separation zone.
  • the accumulator consists of an enclosure housing the separation zone and the accumulation zone, the enclosure comprising a partition lower that defines the accumulation zone in the lower part of the enclosure.
  • the internal heat exchanger is configured so that the refrigerant circulating inside the branch "high pressure” can give heat to the refrigerant circulating inside the branch "low pressure”.
  • the document JP10019421 proposes to associate the internal heat exchanger and the accumulator in a combined device.
  • the latter comprises said enclosure which is provided with an opening closed by a cover.
  • the enclosure houses the internal heat exchanger which overhangs the coolant storage zone in the liquid state in the use position of the combined device on the air conditioning loop.
  • JP-A-2004 028 525 shows a combined device according to the preamble of claim 1.
  • such a combined device consists of a large number of disparate parts which generates manufacturing costs that should be reduced.
  • a second object of the present invention is to provide an air conditioning loop comprising such a combined device, the arrangement of the latter facilitating its integration on the air conditioning loop in certain conformations of the latter and improving a coefficient of performance "COP" of the said loop.
  • the duct advantageously comprises a first end equipped with a first opening which is formed through the delimiting wall and a second end equipped with a second opening which is formed through the confinement wall.
  • the delimiting wall is preferably provided with a flange which surrounds the first opening.
  • the flange is preferably flared towards the separation zone.
  • the delimiting wall is preferably shaped into a disc having a center provided with the first opening and a flange of which is provided with at least one positioning lug of the delimiting wall against the peripheral wall of the enclosure.
  • the confinement wall comprises in particular an internal face which is arranged vis-à-vis the partition wall.
  • the inner face is for example convex while being seen from the delimiting wall.
  • the internal face is for example still arranged in a bowl having a center of curvature C , indifferently disposed between the delimiting wall and the confinement wall or above the delimiting wall.
  • the bowl advantageously comprises a bottom arranged in a channel.
  • the confinement wall preferably comprises an inner edge provided with a first groove for receiving a first seal between the confinement wall and a central crown constituting the internal heat exchanger.
  • the confinement wall preferably comprises an outer edge provided with a second groove for receiving a second seal between the confinement wall and said peripheral wall.
  • At least one channel is provided between the internal face and an internal volume of the conduit.
  • At least one capillary is provided between the inner face and an outer face of the confinement wall, the outer face being opposite to said inner face.
  • the outer face is advantageously provided with a recess for the passage of an upper plug equipping a "low pressure" collector of the internal heat exchanger.
  • the confinement wall is preferably provided with a skirt to at least partially envelop the internal heat exchanger.
  • the skirt is for example provided with support grooves of the skirt against said peripheral wall.
  • the skirt is for example still provided with a lower bearing edge against the lower wall of the enclosure.
  • the skirt is in particular provided with at least one receiving window of at least one corresponding finger which is formed on a lower plate of the internal heat exchanger.
  • An air conditioning loop of the present invention is mainly recognizable in that said loop comprises such a combined device.
  • the duct advantageously constitutes a complementary heat exchange zone between the low-pressure refrigerant circulating inside the internal volume of the duct and the high-pressure refrigerant circulating inside the "high-pressure" collector.
  • a ventilation, heating and / or air conditioning equipment fitted to a motor vehicle cooperates with an air conditioning loop 1 for cooling a flow of air 2 prior to the delivery of the latter inside the passenger compartment of the vehicle.
  • the air conditioning loop 1 comprises a compressor 3, a gas cooler 4, an internal heat exchanger 5, an expansion device 6, an evaporator 7 and an accumulator 8 inside which a cooling fluid circulates, such as a supercritical fluid, carbon dioxide known under the reference R744 in particular.
  • An additive such as a lubricating oil, is mixed with the refrigerant to maintain the operation of the compressor 3, the lubricating oil having a density greater than that of the refrigerant.
  • the refrigerant flows from the compressor 3 to the gas cooler 4, then through a "high pressure” branch 9 of the internal heat exchanger 5, then to the expansion member 6, then through the 7, then to the accumulator 8, and finally through a branch "low pressure” 10 of the internal heat exchanger 5, to return to the compressor 3.
  • These provisions are intended to allow a heat exchange between the coolant circulating at high pressure and at high temperature inside said "high pressure” branch 9 and the coolant circulating at low pressure and at low temperature inside said "low pressure” branch 10. This results in an improvement a coefficient of performance "COP" of the air conditioning loop 1.
  • the air conditioning loop 1 comprises a "high pressure" line 17 which starts at the outlet of the compressor 3 and ends at the inlet of the expansion member 6, in a direction of circulation 11 of the refrigerant inside the airbag loop. air conditioning 1, the gas cooler 4 and the branch "high pressure" 9 of the internal heat exchanger 5 being interposed between these two points.
  • the air conditioning loop 1 also comprises a "low pressure" line 18 which starts at the outlet of the expansion member 6 and ends at the inlet of the compressor 3, in the direction of circulation 11 of the refrigerant inside the loop 1, the evaporator 7, the accumulator 8 and the branch "low pressure" 10 of the internal heat exchanger 5 being interposed between these two points.
  • the accumulator 8 disposed downstream of the evaporator 7 in the direction of circulation 11 of the refrigerant fluid inside the air conditioning loop 1, allows a separation of a gaseous phase and a liquid phase of the cooling fluid. from the evaporator 7 and then recovering the coolant and the lubricating oil in the liquid state.
  • the accumulator 8 comprises a separation zone 19 of said phases and an accumulation zone 20 of the liquid phase.
  • the internal heat exchanger 5 and the accumulator 8 are associated in a combined device 12 forming a one-piece assembly jointly ensuring the functions of the internal heat exchanger 5 and the accumulator 8.
  • the combined and monoblock characters of said device 12 allow the internal heat exchanger 5 and the accumulator 8 to be installed simultaneously on the air conditioning loop 1, the internal heat exchanger 5 and the accumulator 8 forming an integrated assembly. This has the effect of dispensing with a pipe installed in the engine compartment of the vehicle, between an outlet 22 of the accumulator 8 and an inlet 23 of the branch "low pressure" 10 of the internal heat exchanger 5.
  • the combined device 12 has a "high pressure” inlet 13 through which the refrigerant from the gas cooler 4 is admitted inside the combined device 12.
  • the combined device 12 also has a “high pressure” outlet 14 to through which the high pressure refrigerant is discharged from the combined device 12 to the expansion member 6.
  • the "high pressure" inlet 13 and the “high pressure” outlet 14 are connected to each other by the intermediate of a “high pressure” circulation path 24 which includes the branch "high pressure" 9.
  • the combined device 12 also has a "low pressure” inlet 15 through which refrigerant from the evaporator 7 is admitted into the combined device 12.
  • the combined device 12 finally has a “low pressure” outlet 16 through which the low pressure refrigerant is discharged from the combined device 12 to the compressor 3.
  • the "low pressure" inlet 15 and the “low pressure” outlet 16 are connected to each other via a "low pressure” circulation path 25 which comprises the "low pressure" branch 10 of the internal heat exchanger 5 and the separation zone 19.
  • the combined device 12 comprises an enclosure 26 which consists of an upper partition 27, a lower partition 28 and at least one peripheral wall 29.
  • the latter is in particular formed into an elongated tube whose ends are closed by an upper cover forming the upper partition 27 and a lower cover forming the lower partition 28.
  • the enclosure 26 houses the internal heat exchanger 5, the separation zone 19 and the accumulation zone 20.
  • the enclosure 26 houses a one-piece internal component 30 which is formed of a delimiting wall 31 of the separation zone 19 and of the accumulation zone 20, of a confinement wall 32 of the internal heat exchanger 5 with respect to the accumulation zone 20, and a conduit 33 which connects the confinement wall 32 and the boundary wall 31.
  • the designers of the present invention have made the choice to assign to a single single-piece internal component 30 all or active participation in the above functions of the combined device. This choice facilitates assembly operations of said combined device 12, reduces the size and weight of the latter, said integral monoblock component 30 being easily achievable at a lower cost.
  • the one-piece character of the inner component 30 is characterized by the fact that the inner component 30 is formed of an integral assembly 31, 32, 33 consisting of said delimiting wall 31, said confinement wall 32 and said duct 33, the integral assembly 31,32,33 being capable of being installed together inside the enclosure 26 in a single mounting operation.
  • the integral assembly 31,32,33 consists of a single piece made for example by injection of a plastic material.
  • the integral assembly 31, 32, 33 consists of two parts assembled by interlocking, by gluing or the like and respectively constituted for example on the one hand by the delimiting wall 31 and the duct 33 which confer the one-piece character and on the other hand of the confinement wall 32, or constituted for example again on the one hand the delimiting wall 31, and on the other hand the conduit 33 and the confinement wall 32 which gives the monoblock character.
  • the boundary wall 31 partially isolates the separation zone 19 and the accumulation zone 20 from each other.
  • the boundary wall 31 is interposed between the separation zone 19 and the accumulation zone 20.
  • the confinement wall 32 isolates the accumulation zone 20 and the heat exchanger 5 from each other. The latter is interposed between the confinement wall 32 and the lower partition 28. It can be seen that the zone accumulation 20 is itself interposed between the delimiting wall 31 and the confinement wall 32.
  • the conduit 33 is interposed between the boundary wall 31 and the containment wall extending inside the accumulation zone 20.
  • the conduit 33 has a first end 34 equipped with a first opening 35 which is provided through the delimiting wall 31 and a second end 36 equipped with a second opening 37 which is formed through the confinement wall 32.
  • the duct 33 delimits an internal volume 38 which is in aeraulic communication with the separation zone 19 through through the first opening 35 and with the internal heat exchanger 5 through the second opening 37.
  • the delimiting wall 31 is provided with a flange 39 which is formed around the first opening 35 while being flared from the delimiting wall 31 to the separation zone 19.
  • These provisions are intended to facilitate an admission of the refrigerant fluid in the gaseous state inside the internal volume 38 of the conduit 33 and to prevent an admission of the coolant fluid in the liquid state inside of said internal volume 38. It finally results that the refrigerant fluid from the evaporator 7 is cyclically split into gas and liquid following its admission inside the separation zone 19 via a nozzle 40 fitted to the "low pressure" inlet 15 of the combined device 12.
  • the nozzle 40 is for example formed into a cylinder provided with a tangential orifice 41 to facilitate said split between the coolant in the liquid state and the fluid refrigerant in the gaseous state.
  • the coolant in the liquid state tends to drop by gravity from the nozzle 40 to the boundary wall 31 while the refrigerant fluid in the gaseous state disperses within the separation zone 19 up to including penetrate inside said internal volume 38.
  • the delimiting wall 31 is in the form of a disk, a center 42 of which is provided with the first opening 35 and a flange 43 of which is provided with lugs 44 for positioning the delimiting wall 31 against the peripheral wall 29 of the enclosure 26 .
  • the confinement wall 32 is provided with a skirt 45 to at least partially envelop the internal heat exchanger 5.
  • the skirt 45 covers the internal heat exchanger 5 and isolates the latter from the peripheral wall 29 of the enclosure 26.
  • the skirt 45 is for example provided with bearing grooves 46 of the skirt 45 against said peripheral wall 29.
  • the skirt 45 has a lower border 47 bearing against the lower wall 28 of the enclosure 26.
  • the upper partition 27 is the one provided with the nozzle 40.
  • the identification of the nozzle 40 on the combined device 12 determines that of the partitions 27 28, which is the so-called upper partition, either in the position of use of the combined device 12, or in the realistic operating position thereof.
  • the upper partition 27 is arranged in a retractable top cover and provided with the "low pressure” inlet 15 and the “high pressure” outlet 14 while the lower partition 28 is arranged. in a retractable bottom cover and provided with the "high pressure” inlet 13 and the "low pressure” outlet 16.
  • the "high pressure" inlet 13 is in communication with a peripheral "high pressure” collector 51 which is in connection with a peripheral end 52 of a flat tube 21.
  • the latter is wound on itself around the longitudinal extension axis ⁇ up to a central end 49 of said flat tube 21.
  • the said central end 49 is provided with a central "high pressure" collector 48 which is housed at least partially inside the conduit 33.
  • the conduit 33 constitutes a zone complementary heat exchange between the low-pressure refrigerant circulating inside the internal volume 38 of the conduit 33 and the high-pressure refrigerant circulating inside the central "high pressure" collector 48.
  • the flat tube 21 is bordered by two secondary flat tubes 50 inside which circulates the refrigerant fluid at low pressure.
  • the flat tube 21 is bordered by a single secondary flat tube 50, indifferently internal or external.
  • the flat tube 21 is simply bathed in the low-pressure refrigerant fluid which flows inside an interstitial space formed between two consecutive turns of the winding of the flat tube 21 on it -even.
  • the central "high pressure" collector 48 is arranged in a central tube provided with a lower plug 53, the "high pressure” peripheral collector 51 being arranged in a peripheral tube provided with an upper plug 54.
  • the heat exchanger internal 5 comprises an upper plate 55 covering the winding of the flat tube 21 and optionally the flat tube (s) flat (s) secondary (s) 50 and a lower plate 56 covering the winding of the flat tube 21 and possibly the secondary flat tube (s) 50.
  • the upper plate 55 and the lower plate 56 take respectively support against the upper slices 57 and lower 58 of the flat tube 21 and optionally or the flat tube (s) secondary (s) 50.
  • Said upper plate 55 is provided with an orifice 59 for passing through the upper plug 54 which emerges beyond the upper plate 55.
  • the upper plate 55 is also provided with a central ring 60 formed on an outer face 61 of the upper plate 55, said outer face 61 being that which is free of contact with the flat tube 21 and possibly the flat tube (s) or (s) secondary (s) 50.
  • the central ring 60 is provided with a receiving groove 62 of a first seal, visible on the fig.8 .
  • the central ring 60 has a passage 63 for the passage of the central "high pressure" collector 48.
  • the upper plate 55 finally has an oblong hole 100 whose function is to allow the passage of the oil which accumulates between the face outer wall 77 of the confinement wall 32 and the upper plate 55 to direct it towards the "low pressure" outlet 16, when using the integral inner component as shown in FIGS. figures 9 or 10 .
  • Said bottom plate 56 is provided with a hole 64 which comes opposite said "low pressure" outlet 16 for the discharge of the refrigerant from the combined device 12 to the compressor 3.
  • Said lower plate 56 is also provided with fingers 65 formed on a slice of said bottom plate 56 for their interlocking inside corresponding windows 66 formed on the skirt 45, said windows being visible on the fig.6
  • the skirt 45 is provided with a notch 67 for the passage of the refrigerant fluid at low pressure on either side of the skirt 45, and thus allow a recovery of the refrigerant fluid having passed between the skirt 45 and the wall device 29 of the enclosure 26.
  • said lower platen 56 consists of two elementary platens 68, 69, including an upper platinum element 68 and a platinum Lower elementary element 69. Between the upper elementary plate 68 and the lower elementary plate 69, a reserve of oil 70 is formed.
  • the lower elementary plate 69 is provided with a radial notch 71 for receiving an oil filter 72.
  • the confinement wall 32 has an internal face 73 which is formed opposite the delimiting wall 31, the confinement wall 32 and the delimiting wall 31 being generally parallel to each other while being substantially orthogonal to said longitudinal extension axis ⁇ of said combined device 12 and to an axis of symmetry ⁇ ' of the conduit 33.
  • the inner face 73 is convex while being seen from the boundary wall 31, so that the lubricating oil accompanying the coolant in the liquid state can easily flow along the inner face 73 for s' spreading between the peripheral wall 29 and the skirt 45, and regaining said "low pressure" outlet 16 through said radial notch 71.
  • the containment wall 32 has an inner edge 74 provided with a first groove 75 for receiving said first seal 76 between the confinement wall 32 and the central ring 60 constituting the internal heat exchanger 5.
  • the containment wall 32 has an outer face 77, opposite to the inner face 73, which is provided with a recess 78 for the passage of the upper plug 54 fitted to the "high pressure" collector 51 of the internal heat exchanger 5.
  • the inner face 73 is arranged in a bowl having a center of curvature C interposed between the delimiting wall 31 and the confinement wall 32.
  • the center of curvature C is placed above the delimiting wall 31.
  • the bowl 73 comprises a bottom 79 arranged in a channel so as to collect the oil which circulates with the refrigerant.
  • the confinement wall 32 comprises an outer edge 80 provided with a second groove 81 for receiving a second seal 82 between the confinement wall 32 and said peripheral wall 29.
  • a channel 83 is formed between the inner face 73 and the outer face 77 of the containment wall 32.
  • Such a channel 83 which extends from the inner face 73 to the outer face 77 of the confinement wall 32 allows reintegration lubricating oil at said "low pressure" outlet 16 of the combined device 12, that is to say downstream of the internal heat exchanger 5 in a direction of circulation 11 of the refrigerant to the The interior of the air-conditioning loop 1.
  • a hole 84 is formed between the inner face 73 and an internal volume 38 of the conduit 33.
  • Such a hole 84 allows a reintegration of the lubricating oil at the inlet 23 of the branch "low pressure" 10 of the internal heat exchanger 5, that is to say upstream of the internal heat exchanger 5 in a direction of circulation 11 of the refrigerant inside the air conditioning loop 1.

Abstract

The device (12) has a chamber (26) including an upper partition (27), a lower partition (28) and a peripheral wall (29). The chamber houses an internal heat exchanger (5), a separation area (19) and an accumulation area (20). The chamber houses a one-piece internal component (30) that comprises a definition wall (31) defining the separation area and the accumulation area. The internal component has a confining wall (32) confining the exchanger with respect to the accumulation area, and a conduit (33) that connects the confining wall and the definition wall. An independent claim is also included for an air-conditioning loop comprising a separation area constituted of an area of separation between a gaseous phase of the coolant and a liquid phase of the coolant.

Description

Domaine technique de l'invention.Technical Field of the Invention

La présente invention est du domaine des boucles de climatisation coopérant avec une installation de ventilation, de chauffage et/ou de climatisation d'un véhicule automobile. Elle a pour objet un dispositif combiné associant un échangeur de chaleur interne et un accumulateur participant d'une telle boucle. Elle a enfin pour objet une boucle de climatisation comprenant un tel dispositif combiné.The present invention is in the field of air conditioning loops cooperating with a ventilation system, heating and / or air conditioning of a motor vehicle. It relates to a combined device associating an internal heat exchanger and a participating accumulator of such a loop. Finally, it relates to an air conditioning loop comprising such a combined device.

Etat de la technique.State of the art

Un véhicule automobile est couramment équipé d'une installation de ventilation, de chauffage et/ou de climatisation pour réguler les paramètres aérothermiques de l'air contenu à l'intérieur de l'habitacle du véhicule. L'installation est principalement constituée d'un boîtier en matière plastique qui est logé sous une planche de bord du véhicule. Le boîtier canalise la circulation d'au moins un flux d'air préalablement à la délivrance de ce dernier à l'intérieur de l'habitacle.A motor vehicle is commonly equipped with a ventilation, heating and / or air conditioning system to regulate the aerothermal parameters of the air contained inside the passenger compartment of the vehicle. The installation consists mainly of a plastic housing that is housed under a dashboard of the vehicle. The housing channels the circulation of at least one air flow prior to the delivery of the latter inside the passenger compartment.

Une telle installation coopère avec une boucle de climatisation pour refroidir le flux d'air préalablement à l'évacuation de ce dernier hors du boîtier vers l'habitacle. Ladite boucle comprend une pluralité d'éléments à l'intérieur desquels circule successivement un fluide réfrigérant, tel qu'un fluide supercritique, dioxyde de carbone connu sous la référence R744 notamment. Ces éléments comprennent au moins un compresseur, un refroidisseur de gaz, un échangeur de chaleur interne, un organe de détente, un évaporateur et un accumulateur.Such an installation cooperates with an air conditioning loop to cool the air flow prior to the evacuation of the latter out of the housing to the passenger compartment. Said loop comprises a plurality of elements inside which circulates successively a cooling fluid, such as a supercritical fluid, carbon dioxide known under the reference R744 in particular. These elements comprise at least one compressor, a gas cooler, an internal heat exchanger, an expansion member, an evaporator and an accumulator.

Le fluide réfrigérant circule depuis le compresseur vers le refroidisseur de gaz, puis au travers d'une branche « haute pression » de l'échangeur de chaleur interne, puis vers l'organe de détente, ensuite au travers de l'évaporateur, puis vers l'accumulateur, et enfin au travers d'une branche « basse pression » de l'échangeur de chaleur interne, pour retourner au compresseur.The refrigerant flows from the compressor to the gas cooler, then through a "high pressure" branch of the heat exchanger internal, then to the expansion member, then through the evaporator, then to the accumulator, and finally through a branch "low pressure" of the internal heat exchanger, to return to the compressor.

Le compresseur est destiné à recevoir le fluide réfrigérant à l'état gazeux et à le comprimer pour le porter à haute pression. Le refroidisseur de gaz est apte à refroidir le fluide réfrigérant comprimé, à pression relativement constante, en cédant de la chaleur à son environnement. L'organe de détente est à même d'abaisser la pression du fluide réfrigérant sortant du refroidisseur de gaz en l'amenant au moins en partie à l'état liquide. L'évaporateur est quant à lui propre à faire passer à l'état gazeux le fluide réfrigérant à l'état liquide provenant de l'organe de détente, à pression relativement constante, en prélevant de la chaleur audit flux d'air qui traverse l'évaporateur. Le fluide réfrigérant vaporisé est ensuite aspiré par le compresseur. Ces dispositions sont telles que le fluide réfrigérant est à haute pression à l'intérieur de la branche « haute pression » de l'échangeur de chaleur interne tandis qu'il est à basse pression à l'intérieur de la branche « basse pression » de l'échangeur de chaleur interne.The compressor is intended to receive the refrigerant fluid in the gaseous state and to compress it to carry it at high pressure. The gas cooler is adapted to cool the compressed refrigerant at a relatively constant pressure, giving up heat to its environment. The expansion member is able to lower the pressure of the refrigerant leaving the gas cooler by bringing it at least partly in the liquid state. The evaporator is itself capable of passing the coolant in the liquid state from the expansion element, at relatively constant pressure, to the gaseous state, by taking heat from said air flow which passes through the 'evaporator. The vaporized refrigerant is then sucked by the compressor. These arrangements are such that the coolant is at high pressure inside the "high pressure" branch of the internal heat exchanger while it is at low pressure inside the "low pressure" branch of the internal heat exchanger. the internal heat exchanger.

L'accumulateur assure une fonction de séparation entre une phase gazeuse et une phase liquide du fluide réfrigérant. A cette fin, l'accumulateur comporte une zone de séparation à l'intérieur de laquelle lesdites phases se dissocient l'une de l'autre par gravité.The accumulator provides a separation function between a gaseous phase and a liquid phase of the refrigerant. For this purpose, the accumulator comprises a separation zone inside which said phases dissociate from one another by gravity.

L'accumulateur assure aussi une fonction de stockage d'une charge circulante de fluide réfrigérant en fonction des conditions d'utilisation de la boucle de climatisation. Pour cela, l'accumulateur comporte une zone d'accumulation du fluide réfrigérant à l'état liquide que la zone d'accumulation recueille en provenance de la zone de séparation.The accumulator also provides a storage function for a circulating coolant charge depending on the conditions of use of the air conditioning loop. For this, the accumulator comprises a refrigerant storage zone in the liquid state that the accumulation zone collects from the separation zone.

Dans sa généralité, l'accumulateur est constitué d'une enceinte logeant la zone de séparation et la zone d'accumulation, l'enceinte comprenant une cloison inférieure qui délimite la zone d'accumulation en partie basse de l'enceinte. Ainsi, le fluide réfrigérant à l'état liquide en provenance de l'évaporateur se sépare en phase gazeuse et en phase liquide, cette dernière venant s'accumuler par gravité au-dessus de la cloison inférieure, à l'intérieur de la zone d'accumulation.In its generality, the accumulator consists of an enclosure housing the separation zone and the accumulation zone, the enclosure comprising a partition lower that defines the accumulation zone in the lower part of the enclosure. Thus, the refrigerant fluid in the liquid state from the evaporator separates in the gas phase and in the liquid phase, the latter coming to accumulate by gravity above the lower wall, within the zone d 'accumulation.

L'échangeur de chaleur interne est configuré de manière à ce que le fluide réfrigérant circulant à l'intérieur de la branche « haute pression » puisse céder de la chaleur au fluide réfrigérant circulant à l'intérieur de la branche « basse pression ».The internal heat exchanger is configured so that the refrigerant circulating inside the branch "high pressure" can give heat to the refrigerant circulating inside the branch "low pressure".

Le document JP10019421 (NIPPON SOKEN ; DENSO CORP) propose d'associer l'échangeur de chaleur interne et l'accumulateur en un dispositif combiné. Dans sa généralité, ce dernier comprend ladite enceinte qui est pourvue d'une ouverture obturée par un couvercle. L'enceinte loge l'échangeur de chaleur interne qui surplombe la zone d'accumulation de fluide réfrigérant à l'état liquide en position d'utilisation du dispositif combiné sur la boucle de climatisation.The document JP10019421 (NIPPON SOKEN, DENSO CORP) proposes to associate the internal heat exchanger and the accumulator in a combined device. In its generality, the latter comprises said enclosure which is provided with an opening closed by a cover. The enclosure houses the internal heat exchanger which overhangs the coolant storage zone in the liquid state in the use position of the combined device on the air conditioning loop.

JP-A- 2004 028 525 montre un dispositif combiné selon le préambule de la revendication 1. JP-A-2004 028 525 shows a combined device according to the preamble of claim 1.

Un tel dispositif combiné présente des inconvénients au regard d'une complexité structurelle excessive qui mérite d'être simplifiée.Such a combined device has disadvantages in view of excessive structural complexity that deserves to be simplified.

Plus particulièrement, un tel dispositif combiné est constitué d'un nombre conséquent de pièces disparates ce qui engendre des coûts de fabrication qu'il convient de réduire.More particularly, such a combined device consists of a large number of disparate parts which generates manufacturing costs that should be reduced.

Plus particulièrement encore, un tel dispositif combiné s'avère encombrant et sa compacité mérite d'être accrue.More particularly, such a combined device is bulky and its compactness deserves to be increased.

De plus, dans le cas courant où une huile est ajoutée au fluide réfrigérant circulant à l'intérieur de ladite boucle, l'agencement d'un tel dispositif combiné ne prévoit ni le stockage, ni la réintégration à l'intérieur de ladite boucle.In addition, in the current case where an oil is added to the refrigerant circulating inside said loop, the arrangement of such a combined device does not provide for storage or reintegration within said loop.

Enfin, un tel dispositif combiné mérite d'être amélioré au regard de multiples fonctions qu'il assure. Plus particulièrement, un tel dispositif combiné mérite d'être optimisé pour notamment :

  • Faciliter ou améliorer une séparation des phases gazeuse et liquide de fluide réfrigérant en provenance de l'évaporateur,
  • améliorer la circulation du fluide réfrigérant à l'intérieur d'une branche « basse pression » pour optimiser un échange de chaleur entre le fluide réfrigérant circulant à l'intérieur de la branche « basse pression » et le fluide réfrigérant circulant à l'intérieur d'une branche « haute pression »,
  • permettre une fabrication aisée et rapide des différents éléments constitutifs dudit dispositif combiné, et
  • permettre un assemblage aisé et rapide entre eux de ces différents éléments.
Finally, such a combined device deserves to be improved with regard to multiple functions it provides. More particularly, such a combined device deserves to be optimized especially for:
  • Facilitate or improve separation of the gaseous and liquid phases of the refrigerant fluid from the evaporator,
  • to improve the circulation of the refrigerant fluid within a "low pressure" branch in order to optimize a heat exchange between the refrigerant circulating inside the "low pressure" branch and the refrigerant circulating inside the "low pressure"branch;'abranch' high pressure ',
  • allow an easy and rapid manufacture of the various constituent elements of said combined device, and
  • allow easy and fast assembly between them of these different elements.

Objet de l'invention.Object of the invention

Un premier but de la présente invention est de proposer un dispositif combiné associant un échangeur de chaleur interne et un accumulateur participant d'une boucle de climatisation, ledit dispositif combiné étant agencé pour :

  • faciliter ou améliorer une séparation de phases gazeuse et liquide d'un fluide réfrigérant circulant à l'intérieur d'une telle boucle,
  • améliorer la circulation du fluide réfrigérant à l'intérieur d'une branche « basse pression » de l'échangeur de chaleur interne pour optimiser un échange de chaleur entre le fluide réfrigérant circulant à l'intérieur de ladite branche « basse pression » et le fluide réfrigérant circulant à l'intérieur d'une branche « haute pression » de l'échangeur de chaleur interne,
  • augmenter une étanchéité entre différents composants que le dispositif combiné comporte,
  • ménager une réserve d'huile optimisée et faciliter la réinjection de l'huile à l'intérieur de la boucle de climatisation,
  • permettre une fabrication aisée et rapide des différents éléments constitutifs dudit dispositif combiné, et
  • permettre un assemblage aisé et rapide entre eux de ces différents éléments.
A first object of the present invention is to propose a combined device associating an internal heat exchanger and a participating accumulator of an air conditioning loop, said combined device being arranged for:
  • to facilitate or improve a gas and liquid phase separation of a refrigerant circulating inside such a loop,
  • to improve the circulation of the refrigerant fluid inside a "low pressure" branch of the internal heat exchanger in order to optimize a heat exchange between the refrigerant circulating inside said "low pressure" branch and the fluid refrigerant circulating inside a "high pressure" branch of the internal heat exchanger,
  • to increase a seal between different components that the combined device comprises,
  • provide an optimized oil reserve and facilitate the reinjection of the oil inside the air conditioning loop,
  • allow an easy and rapid manufacture of the various constituent elements of said combined device, and
  • allow easy and fast assembly between them of these different elements.

Un second but de la présente invention est de proposer une boucle de climatisation comprenant un tel dispositif combiné, l'agencement de ce dernier facilitant son intégration sur la boucle de climatisation dans certaines conformations de cette dernière et améliorant un coefficient de performance « COP » de la dite boucle.A second object of the present invention is to provide an air conditioning loop comprising such a combined device, the arrangement of the latter facilitating its integration on the air conditioning loop in certain conformations of the latter and improving a coefficient of performance "COP" of the said loop.

Le dispositif de la présente invention est un dispositif combiné comprenant une enceinte constituée d'une cloison supérieure, d'une cloison inférieure et d'au moins une paroi périphérique. Ladite enceinte loge un échangeur de chaleur interne, une zone de séparation et une zone d'accumulation. L'enceinte loge aussi un composant interne monobloc qui est constitué :

  • d'une paroi de délimitation de la zone de séparation et de la zone d'accumulation,
  • d'une paroi de confinement de l'échangeur de chaleur interne par rapport à la zone d'accumulation,
  • et d'un conduit qui relie la paroi de confinement et la paroi de délimitation.
The device of the present invention is a combined device comprising an enclosure consisting of an upper partition, a lower partition and at least one peripheral wall. Said enclosure houses an internal heat exchanger, a separation zone and an accumulation zone. The enclosure also houses an integral monobloc component which is constituted:
  • a boundary wall of the separation zone and the accumulation zone,
  • a containment wall of the internal heat exchanger with respect to the accumulation zone,
  • and a conduit that connects the confinement wall and the boundary wall.

Le conduit comporte avantageusement une première extrémité équipée d'une première ouverture qui est ménagée à travers la paroi de délimitation et une deuxième extrémité équipée d'une deuxième ouverture qui est ménagée à travers la paroi de confinement.The duct advantageously comprises a first end equipped with a first opening which is formed through the delimiting wall and a second end equipped with a second opening which is formed through the confinement wall.

La paroi de délimitation est préférentiellement munie d'une collerette qui entoure la première ouverture.The delimiting wall is preferably provided with a flange which surrounds the first opening.

La collerette est avantageusement évasée vers la zone de séparation.The flange is preferably flared towards the separation zone.

La paroi de délimitation est préférentiellement conformée en un disque dont un centre est muni de la première ouverture et dont un rebord est pourvu d'au moins un ergot de positionnement de la paroi de délimitation contre la paroi périphérique de l'enceinte.The delimiting wall is preferably shaped into a disc having a center provided with the first opening and a flange of which is provided with at least one positioning lug of the delimiting wall against the peripheral wall of the enclosure.

La paroi de confinement comporte notamment une face interne qui est disposée en vis-à-vis de la paroi de séparation.The confinement wall comprises in particular an internal face which is arranged vis-à-vis the partition wall.

La face interne est par exemple convexe en étant vue depuis la paroi de délimitation.The inner face is for example convex while being seen from the delimiting wall.

La face interne est par exemple encore agencée en une cuvette comportant un centre de courbure C,indifféremment disposé entre la paroi de délimitation et la paroi de confinement ou au-dessus de la paroi de délimitation.The internal face is for example still arranged in a bowl having a center of curvature C , indifferently disposed between the delimiting wall and the confinement wall or above the delimiting wall.

La cuvette comporte avantageusement un fond agencé en une rigole.The bowl advantageously comprises a bottom arranged in a channel.

La paroi de confinement comporte de préférence un bord interne pourvu d'une première saignée de réception d'un premier joint d'étanchéité entre la paroi de confinement et une couronne centrale constitutive de l'échangeur de chaleur interne.The confinement wall preferably comprises an inner edge provided with a first groove for receiving a first seal between the confinement wall and a central crown constituting the internal heat exchanger.

La paroi de confinement comporte préférentiellement un bord externe pourvu d'une deuxième saignée de réception d'un deuxième joint d'étanchéité entre la paroi de confinement et ladite paroi périphérique.The confinement wall preferably comprises an outer edge provided with a second groove for receiving a second seal between the confinement wall and said peripheral wall.

Selon une variante de réalisation, au moins un canal est ménagé entre la face interne et un volume interne du conduit.According to an alternative embodiment, at least one channel is provided between the internal face and an internal volume of the conduit.

Selon une autre variante de réalisation, au moins un capillaire est ménagé entre la face interne et une face externe de la paroi de confinement, la face externe étant opposée à la dite face interne.According to another embodiment, at least one capillary is provided between the inner face and an outer face of the confinement wall, the outer face being opposite to said inner face.

La face externe est avantageusement pourvue d'un évidement pour le passage d'un bouchon supérieur équipant un collecteur « basse pression » de l'échangeur de chaleur interne.The outer face is advantageously provided with a recess for the passage of an upper plug equipping a "low pressure" collector of the internal heat exchanger.

La paroi de confinement est préférentiellement pourvue d'une jupe pour envelopper au moins partiellement l'échangeur de chaleur interne.The confinement wall is preferably provided with a skirt to at least partially envelop the internal heat exchanger.

La jupe est par exemple pourvue de rainures d'appui de la jupe contre ladite paroi périphérique.The skirt is for example provided with support grooves of the skirt against said peripheral wall.

La jupe est par exemple encore pourvue d'une bordure inférieure d'appui contre la cloison inférieure de l'enceinte.The skirt is for example still provided with a lower bearing edge against the lower wall of the enclosure.

La jupe est notamment pourvue d'au moins une fenêtre de réception d'au moins un doigt correspondant qui est ménagé sur une platine inférieure de l'échangeur de chaleur interne.The skirt is in particular provided with at least one receiving window of at least one corresponding finger which is formed on a lower plate of the internal heat exchanger.

Une boucle de climatisation de la présente invention est principalement reconnaissable en ce que ladite boucle comprend un tel dispositif combiné.An air conditioning loop of the present invention is mainly recognizable in that said loop comprises such a combined device.

La boucle de climatisation étant parcourue par un fluide réfrigérant supercritique, ladite boucle est caractérisée en ce que :

  • la zone de séparation constitue une zone de dissociation entre une phase gazeuse du fluide réfrigérant et une phase liquide du fluide réfrigérant, et
  • la zone d'accumulation constitue une zone de stockage de la phase liquide du fluide réfrigérant en provenance de la zone de séparation.
The air conditioning loop being traversed by a supercritical refrigerant fluid, said loop is characterized in that :
  • the separation zone constitutes a zone of dissociation between a gaseous phase of the coolant and a liquid phase of the coolant, and
  • the accumulation zone constitutes a storage zone for the liquid phase of the refrigerant fluid from the separation zone.

De préférence, le dispositif combiné comprend :

  • un chemin de circulation « haute pression » s'étendant entre une entrée « haute pression » ménagée à travers la cloison inférieure de l'enceinte et une sortie « haute pression » ménagée à travers la cloison supérieure de l'enceinte, le chemin de circulation « haute pression » étant principalement constitué d'une branche « haute pression » de l'échangeur de chaleur interne et d'un collecteur « haute pression » de l'échangeur de chaleur interne, le collecteur « haute pression » étant au moins partiellement logé à l'intérieur d'un volume interne du conduit,
  • un chemin de circulation « basse pression » s'étendant entre une entrée « basse pression » ménagée à travers la cloison supérieure de l'enceinte et une sortie « basse pression » ménagée à travers la cloison inférieure de l'enceinte, le chemin de circulation « basse pression » comprenant une branche « basse pression » de l'échangeur de chaleur interne, le volume interne du conduit et la zone de séparation.
Preferably, the combined device comprises:
  • a "high pressure" circulation path extending between a "high pressure" inlet formed through the lower wall of the enclosure and a "high pressure" outlet formed through the upper wall of the enclosure, the circulation path "High pressure" mainly consisting of a "high pressure" branch of the internal heat exchanger and a "high pressure" collector of the internal heat exchanger, the "high pressure" collector being at least partially housed inside an internal volume of the duct,
  • a "low pressure" circulation path extending between a "low pressure" inlet formed through the upper wall of the enclosure and a "low pressure" outlet formed through the lower wall of the enclosure, the circulation path "Low pressure" comprising a "low pressure" branch of the internal heat exchanger, the internal volume of the conduit and the separation zone.

Le conduit constitue avantageusement une zone d'échange de chaleur complémentaire entre le fluide réfrigérant à basse pression circulant à l'intérieur du volume interne du conduit et le fluide réfrigérant à haute pression circulant à l'intérieur du collecteur « haute pression ».The duct advantageously constitutes a complementary heat exchange zone between the low-pressure refrigerant circulating inside the internal volume of the duct and the high-pressure refrigerant circulating inside the "high-pressure" collector.

Description des figures.Description of the figures.

La présente invention sera mieux comprise, et des détails en relevant apparaîtront, à la lecture de la description qui va être faite de variantes de réalisation en relation avec les figures des planches annexées, dans lesquelles :

  • La fig.1 est une illustration schématique d'une boucle de climatisation comprenant un dispositif combiné selon la présente invention.
  • Les fig.2 et fig.3 sont des illustrations schématiques en coupe longitudinale de variantes respectives de réalisation du dispositif combiné représenté sur la figure précédente.
  • La fig.4 est une vue en coupe transversale du dispositif combiné illustré sur la fig.3.
  • La fig.5 est une vue en perspective éclatée d'un échangeur de chaleur interne constitutif dudit dispositif combiné.
  • La fig.6 est une vue en perspective éclatée d'un composant interne participant du dispositif combiné illustré sur la figure précédente.
  • La fig.7 est une vue en perspective éclatée d'une partie basse dudit dispositif combiné.
  • La fig.8 est une vue partielle en perspective écorchée dudit dispositif combiné.
  • La fig.9 est une vue en perspective d'une première variante de réalisation d'un composant interne constitutif dudit combiné.
  • La fig.10 est une vue en perspective d'une deuxième variante de réalisation d'un composant interne constitutif dudit combiné.
The present invention will be better understood, and details will arise from reading the description which will be made of variants in connection with the figures of the attached plates, in which:
  • The fig.1 is a schematic illustration of an air conditioning loop comprising a combined device according to the present invention.
  • The fig.2 and fig.3 are schematic illustrations in longitudinal section of respective embodiments of the combined device shown in the previous figure.
  • The fig.4 is a cross-sectional view of the combined device shown in FIG. fig.3 .
  • The fig.5 is an exploded perspective view of an internal heat exchanger constituting said combined device.
  • The fig.6 is an exploded perspective view of a participating internal component of the combined device illustrated in the preceding figure.
  • The fig.7 is an exploded perspective view of a bottom portion of said combined device.
  • The fig.8 is a partial cut perspective view of said combined device.
  • The fig.9 is a perspective view of a first embodiment of a constituent internal component of said handset.
  • The fig.10 is a perspective view of a second variant embodiment of a constituent internal component of said handset.

Sur la fig.1, une installation de ventilation, de chauffage et/ou de climatisation équipant un véhicule automobile coopère avec une boucle de climatisation 1 pour refroidir un flux d'air 2 préalablement à la délivrance de ce dernier à l'intérieur de l'habitacle du véhicule. La boucle de climatisation 1 comprend un compresseur 3, un refroidisseur de gaz 4, un échangeur de chaleur interne 5, un organe de détente 6, un évaporateur 7 et un accumulateur 8 à l'intérieur desquels circule un fluide réfrigérant, tel qu'un fluide supercritique, dioxyde de carbone connu sous la référence R744 notamment. Un additif, tel qu'une huile de graissage, est mélangé au fluide réfrigérant pour pérenniser le fonctionnement du compresseur 3, l'huile de graissage présentant une densité supérieure à celle du fluide réfrigérant.On the fig.1 , a ventilation, heating and / or air conditioning equipment fitted to a motor vehicle cooperates with an air conditioning loop 1 for cooling a flow of air 2 prior to the delivery of the latter inside the passenger compartment of the vehicle. The air conditioning loop 1 comprises a compressor 3, a gas cooler 4, an internal heat exchanger 5, an expansion device 6, an evaporator 7 and an accumulator 8 inside which a cooling fluid circulates, such as a supercritical fluid, carbon dioxide known under the reference R744 in particular. An additive, such as a lubricating oil, is mixed with the refrigerant to maintain the operation of the compressor 3, the lubricating oil having a density greater than that of the refrigerant.

Le fluide réfrigérant circule depuis le compresseur 3 vers le refroidisseur de gaz 4, puis au travers d'une branche « haute pression » 9 de l'échangeur de chaleur interne 5, puis vers l'organe de détente 6, ensuite au travers de l'évaporateur 7, puis vers l'accumulateur 8, et enfin au travers d'une branche « basse pression » 10 de l'échangeur de chaleur interne 5, pour retourner au compresseur 3. Ces dispositions visent à permettre un échange de chaleur entre le fluide réfrigérant circulant à haute pression et à haute température à l'intérieur de ladite branche « haute pression » 9 et le fluide réfrigérant circulant à basse pression et à basse température à l'intérieur de ladite branche « basse pression » 10. Il en résulte une amélioration d'un coefficient de performance « COP » de la boucle de climatisation 1.The refrigerant flows from the compressor 3 to the gas cooler 4, then through a "high pressure" branch 9 of the internal heat exchanger 5, then to the expansion member 6, then through the 7, then to the accumulator 8, and finally through a branch "low pressure" 10 of the internal heat exchanger 5, to return to the compressor 3. These provisions are intended to allow a heat exchange between the coolant circulating at high pressure and at high temperature inside said "high pressure" branch 9 and the coolant circulating at low pressure and at low temperature inside said "low pressure" branch 10. This results in an improvement a coefficient of performance "COP" of the air conditioning loop 1.

La boucle de climatisation 1 comprend une ligne « haute pression » 17 qui débute en sortie du compresseur 3 et se termine en entrée de l'organe de détente 6, selon un sens de circulation 11 du fluide réfrigérant à l'intérieur de la boucle de climatisation 1, le refroidisseur de gaz 4 et la branche « haute pression » 9 de l'échangeur de chaleur interne 5 étant interposés entre ces deux points.The air conditioning loop 1 comprises a "high pressure" line 17 which starts at the outlet of the compressor 3 and ends at the inlet of the expansion member 6, in a direction of circulation 11 of the refrigerant inside the airbag loop. air conditioning 1, the gas cooler 4 and the branch "high pressure" 9 of the internal heat exchanger 5 being interposed between these two points.

La boucle de climatisation 1 comprend aussi une ligne « basse pression» 18 qui débute en sortie de l'organe de détente 6 et se termine en entrée du compresseur 3, selon le sens de circulation 11 du fluide réfrigérant à l'intérieur de la boucle de climatisation 1, l'évaporateur 7, l'accumulateur 8 et la branche « basse pression » 10 de l'échangeur de chaleur interne 5 étant interposés entre ces deux points.The air conditioning loop 1 also comprises a "low pressure" line 18 which starts at the outlet of the expansion member 6 and ends at the inlet of the compressor 3, in the direction of circulation 11 of the refrigerant inside the loop 1, the evaporator 7, the accumulator 8 and the branch "low pressure" 10 of the internal heat exchanger 5 being interposed between these two points.

L'accumulateur 8, disposé en aval de l'évaporateur 7 selon le sens de circulation 11 du fluide réfrigérant à l'intérieur de la boucle de climatisation 1, permet une séparation d'une phase gazeuse et d'une phase liquide du fluide réfrigérant en provenance de l'évaporateur 7 et ensuite une récupération du fluide réfrigérant et de l'huile de graissage à l'état liquide. A cette fin, l'accumulateur 8 comporte une zone de séparation 19 desdites phases et une zone d'accumulation 20 de la phase liquide.The accumulator 8, disposed downstream of the evaporator 7 in the direction of circulation 11 of the refrigerant fluid inside the air conditioning loop 1, allows a separation of a gaseous phase and a liquid phase of the cooling fluid. from the evaporator 7 and then recovering the coolant and the lubricating oil in the liquid state. For this purpose, the accumulator 8 comprises a separation zone 19 of said phases and an accumulation zone 20 of the liquid phase.

L'échangeur de chaleur interne 5 et l'accumulateur 8 sont associés en un dispositif combiné 12 formant un ensemble monobloc assurant conjointement les fonctions de l'échangeur de chaleur interne 5 et de l'accumulateur 8. Les caractères combiné et monobloc dudit dispositif 12 permettent à l'échangeur de chaleur interne 5 et à l'accumulateur 8 d'être installés simultanément sur la boucle de climatisation 1, l'échangeur de chaleur interne 5 et l'accumulateur 8 formant un ensemble intégré. Ceci a pour effet de se dispenser d'une conduite installée dans le compartiment moteur du véhicule, entre une sortie 22 de l'accumulateur 8 et une entrée 23 de la branche « basse pression » 10 de l'échangeur de chaleur interne 5.The internal heat exchanger 5 and the accumulator 8 are associated in a combined device 12 forming a one-piece assembly jointly ensuring the functions of the internal heat exchanger 5 and the accumulator 8. The combined and monoblock characters of said device 12 allow the internal heat exchanger 5 and the accumulator 8 to be installed simultaneously on the air conditioning loop 1, the internal heat exchanger 5 and the accumulator 8 forming an integrated assembly. This has the effect of dispensing with a pipe installed in the engine compartment of the vehicle, between an outlet 22 of the accumulator 8 and an inlet 23 of the branch "low pressure" 10 of the internal heat exchanger 5.

Le dispositif combiné 12 comporte une entrée « haute pression » 13 à travers laquelle le fluide réfrigérant en provenance du refroidisseur de gaz 4 est admis à l'intérieur du dispositif combiné 12. Le dispositif combiné 12 comporte aussi une sortie « haute pression » 14 à travers laquelle le fluide réfrigérant à haute pression est évacué hors du dispositif combiné 12 vers l'organe de détente 6. L'entrée « haute pression » 13 et la sortie « haute pression » 14 sont reliées l'une à l'autre par l'intermédiaire d'un chemin de circulation « haute pression » 24 qui comprend la branche « haute pression » 9.The combined device 12 has a "high pressure" inlet 13 through which the refrigerant from the gas cooler 4 is admitted inside the combined device 12. The combined device 12 also has a "high pressure" outlet 14 to through which the high pressure refrigerant is discharged from the combined device 12 to the expansion member 6. The "high pressure" inlet 13 and the "high pressure" outlet 14 are connected to each other by the intermediate of a "high pressure" circulation path 24 which includes the branch "high pressure" 9.

Le dispositif combiné 12 comporte aussi une entrée « basse pression » 15 à travers laquelle le fluide réfrigérant en provenance de l'évaporateur 7 est admis à l'intérieur du dispositif combiné 12. Le dispositif combiné 12 comporte enfin une sortie « basse pression » 16 à travers laquelle le fluide réfrigérant à basse pression est évacué hors du dispositif combiné 12 vers le compresseur 3. L'entrée « basse pression » 15 et la sortie « basse pression» 16 sont reliées l'une à l'autre par l'intermédiaire d'un chemin de circulation « basse pression » 25 qui comprend la branche « basse pression » 10 de l'échangeur de chaleur interne 5 et la zone de séparation 19.The combined device 12 also has a "low pressure" inlet 15 through which refrigerant from the evaporator 7 is admitted into the combined device 12. The combined device 12 finally has a "low pressure" outlet 16 through which the low pressure refrigerant is discharged from the combined device 12 to the compressor 3. The "low pressure" inlet 15 and the "low pressure" outlet 16 are connected to each other via a "low pressure" circulation path 25 which comprises the "low pressure" branch 10 of the internal heat exchanger 5 and the separation zone 19.

Sur les fig.2 et fig.3, le dispositif combiné 12 comprend une enceinte 26 qui est constituée d'une cloison supérieure 27, d'une cloison inférieure 28 et d'au moins une paroi périphérique 29. Cette dernière est notamment conformée en un tube allongé dont les extrémités sont obturées par un couvercle supérieur formant la cloison supérieure 27 et un couvercle inférieur formant la cloison inférieure 28.On the fig.2 and fig.3 , the combined device 12 comprises an enclosure 26 which consists of an upper partition 27, a lower partition 28 and at least one peripheral wall 29. The latter is in particular formed into an elongated tube whose ends are closed by an upper cover forming the upper partition 27 and a lower cover forming the lower partition 28.

L'enceinte 26 loge l'échangeur de chaleur interne 5, la zone de séparation 19 et la zone d'accumulation 20.The enclosure 26 houses the internal heat exchanger 5, the separation zone 19 and the accumulation zone 20.

Se pose le problème général de l'agencement entre elles des dites zones de séparation 19 et d'accumulation 20, de l'échangeur de chaleur interne 5 et de la conformation générale du dispositif combiné 12 pour que ce dernier assure au mieux les fonctions qui lui sont dévolues, à savoir notamment la séparation des dites phases, le stockage du fluide réfrigérant et/ou de ladite huile, la réintégration de cette dernière en amont du compresseur 3.There arises the general problem of the arrangement between them of said separation zones 19 and of accumulation 20, of the internal heat exchanger 5 and of the general conformation of the combined device 12 so that the latter can best perform the functions which it is devolved to it, namely in particular the separation of said phases, the storage of the refrigerant fluid and / or said oil, the reintegration of the latter upstream of the compressor 3.

Selon la présente invention, l'enceinte 26 loge un composant interne monobloc 30 qui est formé d'une paroi de délimitation 31 de la zone de séparation 19 et de la zone d'accumulation 20, d'une paroi de confinement 32 de l'échangeur de chaleur interne 5 par rapport à la zone d'accumulation 20, et d'un conduit 33 qui relie la paroi de confinement 32 et la paroi de délimitation 31.According to the present invention, the enclosure 26 houses a one-piece internal component 30 which is formed of a delimiting wall 31 of the separation zone 19 and of the accumulation zone 20, of a confinement wall 32 of the internal heat exchanger 5 with respect to the accumulation zone 20, and a conduit 33 which connects the confinement wall 32 and the boundary wall 31.

Les concepteurs de la présente invention ont fait le choix d'affecter à un seul et unique composant interne monobloc 30 l'ensemble ou une participation active aux fonctions susvisées du dispositif combiné. Ce choix permet de faciliter les opérations de montage dudit dispositif combiné 12, réduit l'encombrement et le poids de ce dernier, ledit composant interne monobloc 30 étant facilement réalisable à moindre coût.The designers of the present invention have made the choice to assign to a single single-piece internal component 30 all or active participation in the above functions of the combined device. This choice facilitates assembly operations of said combined device 12, reduces the size and weight of the latter, said integral monoblock component 30 being easily achievable at a lower cost.

Le caractère monobloc du composant interne 30 se caractérise par le fait que le composant interne 30 est formé d'un ensemble solidaire 31,32,33 constitué de ladite paroi de délimitation 31, de ladite paroi de confinement 32 et dudit conduit 33, l'ensemble solidaire 31,32,33 étant susceptible d'être installé conjointement à l'intérieur de l'enceinte 26 en une seule opération de montage. Selon une première forme de réalisation, l'ensemble solidaire 31,32,33 est constitué d'une pièce unique réalisée par exemple par injection d'une matière plastique. Selon d'autres formes de réalisation, l'ensemble solidaire 31,32,33 est constitué de deux pièces assemblées par emboîtement, par collage ou analogue et constituées respectivement par exemple d'une part de la paroi de délimitation 31 et du conduit 33 qui confèrent le caractère monobloc et d'autre part de la paroi de confinement 32, ou constituées par exemple encore d'une part de la paroi de délimitation 31, et d'autre part du conduit 33 et de la paroi de confinement 32 qui confère le caractère monobloc.The one-piece character of the inner component 30 is characterized by the fact that the inner component 30 is formed of an integral assembly 31, 32, 33 consisting of said delimiting wall 31, said confinement wall 32 and said duct 33, the integral assembly 31,32,33 being capable of being installed together inside the enclosure 26 in a single mounting operation. According to a first embodiment, the integral assembly 31,32,33 consists of a single piece made for example by injection of a plastic material. According to other embodiments, the integral assembly 31, 32, 33 consists of two parts assembled by interlocking, by gluing or the like and respectively constituted for example on the one hand by the delimiting wall 31 and the duct 33 which confer the one-piece character and on the other hand of the confinement wall 32, or constituted for example again on the one hand the delimiting wall 31, and on the other hand the conduit 33 and the confinement wall 32 which gives the monoblock character.

La paroi de délimitation 31 isole partiellement l'une de l'autre la zone de séparation 19 et la zone d'accumulation 20. La paroi de délimitation 31 est interposée entre la zone de séparation 19 et la zone d'accumulation 20.The boundary wall 31 partially isolates the separation zone 19 and the accumulation zone 20 from each other. The boundary wall 31 is interposed between the separation zone 19 and the accumulation zone 20.

La paroi de confinement 32 isole l'un de l'autre la zone d'accumulation 20 et l'échangeur de chaleur 5. Ce dernier est interposé entre la paroi de confinement 32 et la cloison inférieure 28. Il en ressort que la zone d'accumulation 20 est elle-même interposée entre la paroi de délimitation 31 et la paroi de confinement 32.The confinement wall 32 isolates the accumulation zone 20 and the heat exchanger 5 from each other. The latter is interposed between the confinement wall 32 and the lower partition 28. It can be seen that the zone accumulation 20 is itself interposed between the delimiting wall 31 and the confinement wall 32.

Le conduit 33 est interposé entre la paroi de délimitation 31 et la paroi de confinement en s'étendant à l'intérieur de la zone d'accumulation 20. Le conduit 33 comporte une première extrémité 34 équipée d'une première ouverture 35 qui est ménagée à travers la paroi de délimitation 31 et une deuxième extrémité 36 équipée d'une deuxième ouverture 37 qui est ménagée à travers la paroi de confinement 32. Le conduit 33 délimite un volume interne 38 qui est en communication aéraulique avec la zone de séparation 19 par l'intermédiaire de la première ouverture 35 et avec l'échangeur de chaleur interne 5 par l'intermédiaire de la deuxième ouverture 37. Ces dispositions sont telles que le volume interne 38 du conduit 33 constitue un passage du fluide réfrigérant à l'état gazeux depuis la zone de séparation 19 vers l'entrée 23 de la branche « basse pression » 10 de l'échangeur de chaleur interne 5.The conduit 33 is interposed between the boundary wall 31 and the containment wall extending inside the accumulation zone 20. The conduit 33 has a first end 34 equipped with a first opening 35 which is provided through the delimiting wall 31 and a second end 36 equipped with a second opening 37 which is formed through the confinement wall 32. The duct 33 delimits an internal volume 38 which is in aeraulic communication with the separation zone 19 through through the first opening 35 and with the internal heat exchanger 5 through the second opening 37. These arrangements are such that the internal volume 38 of the conduit 33 constitutes a passage of the refrigerant in the gaseous state from the separation zone 19 to the inlet 23 of the "low pressure" branch 10 of the internal heat exchanger 5.

La paroi de délimitation 31 est munie d'une collerette 39 qui est ménagée autour de la première ouverture 35 en étant évasée depuis la paroi de délimitation 31 vers la zone de séparation 19. Ces dispositions visent à faciliter une admission du fluide réfrigérant à l'état gazeux à l'intérieur du volume interne 38 du conduit 33 et à empêcher une admission du fluide réfrigérant à l'état liquide à l'intérieur dudit volume interne 38. Il en résulte finalement que le fluide réfrigérant en provenance de l'évaporateur 7 se scinde par effet cyclonique en gaz et en liquide suite à son admission à l'intérieur de la zone de séparation 19 par l'intermédiaire d'une buse 40 équipant l'entrée « basse pression » 15 du dispositif combiné 12. La buse 40 est par exemple conformée en un cylindre muni d'un orifice tangentiel 41 pour faciliter ladite scission entre le fluide réfrigérant à l'état liquide et le fluide réfrigérant à l'état gazeux. Le fluide réfrigérant à l'état liquide tend à chuter par gravité depuis la buse 40 jusque sur la paroi de délimitation 31 tandis que le fluide réfrigérant à l'état gazeux se disperse à l'intérieur de la zone de séparation 19 jusqu'à notamment pénétrer à l'intérieur dudit volume interne 38.The delimiting wall 31 is provided with a flange 39 which is formed around the first opening 35 while being flared from the delimiting wall 31 to the separation zone 19. These provisions are intended to facilitate an admission of the refrigerant fluid in the gaseous state inside the internal volume 38 of the conduit 33 and to prevent an admission of the coolant fluid in the liquid state inside of said internal volume 38. It finally results that the refrigerant fluid from the evaporator 7 is cyclically split into gas and liquid following its admission inside the separation zone 19 via a nozzle 40 fitted to the "low pressure" inlet 15 of the combined device 12. The nozzle 40 is for example formed into a cylinder provided with a tangential orifice 41 to facilitate said split between the coolant in the liquid state and the fluid refrigerant in the gaseous state. The coolant in the liquid state tends to drop by gravity from the nozzle 40 to the boundary wall 31 while the refrigerant fluid in the gaseous state disperses within the separation zone 19 up to including penetrate inside said internal volume 38.

La paroi de délimitation 31 est conformée en un disque dont un centre 42 est muni de la première ouverture 35 et dont un rebord 43 est pourvu d'ergots 44 de positionnement de la paroi de délimitation 31 contre la paroi périphérique 29 de l'enceinte 26.The delimiting wall 31 is in the form of a disk, a center 42 of which is provided with the first opening 35 and a flange 43 of which is provided with lugs 44 for positioning the delimiting wall 31 against the peripheral wall 29 of the enclosure 26 .

Plus particulièrement sur la fig.3, la paroi de confinement 32 est pourvue d'une jupe 45 pour envelopper au moins partiellement l'échangeur de chaleur interne 5. La jupe 45 chapeaute l'échangeur de chaleur interne 5 et isole ce dernier de la paroi périphérique 29 de l'enceinte 26. La jupe 45 est par exemple pourvue de rainures d'appui 46 de la jupe 45 contre ladite paroi périphérique 29. La jupe 45 comporte une bordure inférieure 47 d'appui contre la cloison inférieure 28 de l'enceinte 26.More particularly on the fig.3 , the confinement wall 32 is provided with a skirt 45 to at least partially envelop the internal heat exchanger 5. The skirt 45 covers the internal heat exchanger 5 and isolates the latter from the peripheral wall 29 of the enclosure 26. The skirt 45 is for example provided with bearing grooves 46 of the skirt 45 against said peripheral wall 29. The skirt 45 has a lower border 47 bearing against the lower wall 28 of the enclosure 26.

Ces dispositions sont telles que le chemin de circulation « haute pression» 24 qui s'étend entre l'entrée « haute pression » 13, qui est ménagée à travers la cloison inférieure 28 de l'enceinte 26, et la sortie « haute pression » 14, qui est ménagée à travers la cloison supérieure 27 de l'enceinte 26, traverse de part en part le dispositif combiné 12, globalement parallèlement à un axe d'extension longitudinale Δ dudit dispositif combiné 12, du bas vers le haut sur les fig.2 et fig.3, c'est-à-dire dans un sens opposé à la gravité g.These arrangements are such that the "high pressure" circulation path 24 which extends between the "high pressure" inlet 13, which is formed through the lower wall 28 of the enclosure 26, and the "high pressure" outlet 14, which is formed through the upper partition 27 of the enclosure 26, passes right through the combined device 12, generally parallel to a longitudinal extension axis Δ of said combined device 12, from bottom to top on the fig.2 and fig.3 that is, in a direction opposite to gravity g .

Ces dispositions sont aussi telles que le chemin de circulation « basse pression » 25 qui s'étend entre l'entrée « basse pression » 15, qui est ménagée à travers la cloison supérieure 27 de l'enceinte 26, et la sortie « basse pression » 16, qui est ménagée à travers la cloison inférieure 28 de l'enceinte 26, traverse de part en part le dispositif combiné 12, globalement parallèlement à l'axe d'extension longitudinale Δ dudit dispositif combiné 12, du haut vers le bas sur les fig.2 et fig.3, c'est-à-dire dans un sens identique à celui de la gravité g.These arrangements are also such that the "low pressure" circulation path 25 which extends between the "low pressure" inlet 15, which is formed through the upper partition 27 of the enclosure 26, and the "low pressure" outlet 16, which is formed through the lower partition 28 of the enclosure 26, passes right through the combined device 12, generally parallel to the longitudinal extension axis Δ of said combined device 12, from top to bottom on the fig.2 and fig.3 that is to say in a sense identical to that of gravity g .

Une exception à cette extension des chemins de circulation « haute pression » 24 et « basse pression » 25 réside dans l'échange qui se créé dans l'échangeur de chaleur interne 5, comme cela sera détaillé à la figure 5.An exception to this extension of the "high pressure" and "low pressure" circulation paths 25 lies in the exchange that is created in the internal heat exchanger 5, as will be detailed in FIG. figure 5 .

Il en résulte finalement une caractéristique de la présente invention qui réside dans le fait que la cloison supérieure 27 est celle qui est pourvue de la buse 40. Autrement dit, l'identification de la buse 40 sur le dispositif combiné 12 détermine celle des cloisons 27,28 qui est la cloison dite supérieure, soit en position d'utilisation du dispositif combiné 12, soit en position de fonctionnement réaliste de ce dernier.This finally results in a feature of the present invention which resides in the fact that the upper partition 27 is the one provided with the nozzle 40. In other words, the identification of the nozzle 40 on the combined device 12 determines that of the partitions 27 28, which is the so-called upper partition, either in the position of use of the combined device 12, or in the realistic operating position thereof.

Selon une forme de réalisation préférée de la présente invention, la cloison supérieure 27 est agencée en un couvercle supérieur escamotable et pourvu de l'entrée « basse pression » 15 et de la sortie « haute pression » 14 tandis que la cloison inférieure 28 est agencée en un couvercle inférieur escamotable et muni de l'entrée « haute pression » 13 et de la sortie « basse pression » 16.According to a preferred embodiment of the present invention, the upper partition 27 is arranged in a retractable top cover and provided with the "low pressure" inlet 15 and the "high pressure" outlet 14 while the lower partition 28 is arranged. in a retractable bottom cover and provided with the "high pressure" inlet 13 and the "low pressure" outlet 16.

Sur la fig.4, qui représente une coupe transversale du dispositif combiné 12 selon la fig.3 au niveau de l'échangeur de chaleur interne 5, l'entrée « haute pression » 13 est en communication avec un collecteur « haute pression » périphérique 51 qui est en relation avec une extrémité périphérique 52 d'un tube plat 21. Ce dernier est enroulé sur lui-même autour de l'axe d'extension longitudinale Δ jusqu'à une extrémité centrale 49 dudit tube plat 21. La dite extrémité centrale 49 est munie d'un collecteur « haute pression » central 48 qui est logé au moins partiellement à l'intérieur du conduit 33. Il en découle que le conduit 33 constitue une zone d'échange de chaleur complémentaire entre le fluide réfrigérant à basse pression circulant à l'intérieur du volume interne 38 du conduit 33 et le fluide réfrigérant à haute pression circulant à l'intérieur du collecteur « haute pression » central 48. Il en résulte une augmentation de l'ordre de 3 % à 7 % d'un rendement d'échange thermique par rapport à un échangeur de chaleur interne 5 non équipé d'un collecteur « haute pression » central 48 logé à l'intérieur d'un volume interne 38 d'un conduit 33 d'un tel composant interne monobloc 30.On the fig.4 which represents a cross-section of the combined device 12 according to the fig.3 at the level of the internal heat exchanger 5, the "high pressure" inlet 13 is in communication with a peripheral "high pressure" collector 51 which is in connection with a peripheral end 52 of a flat tube 21. The latter is wound on itself around the longitudinal extension axis Δ up to a central end 49 of said flat tube 21. The said central end 49 is provided with a central "high pressure" collector 48 which is housed at least partially inside the conduit 33. It follows that the conduit 33 constitutes a zone complementary heat exchange between the low-pressure refrigerant circulating inside the internal volume 38 of the conduit 33 and the high-pressure refrigerant circulating inside the central "high pressure" collector 48. This results in a increase of the order of 3% to 7% of a heat exchange efficiency compared to an internal heat exchanger 5 not equipped with a central "high pressure" collector 48 housed inside an internal volume 38 of a duct 33 of such an integral monobloc component 30.

Le tube plat 21 est bordé par deux tubes plats secondaires 50 à l'intérieur desquels circule le fluide réfrigérant à basse pression. Selon une autre variante de réalisation, le tube plat 21 est bordé par un seul tube plat secondaire 50, indifféremment interne ou externe. Selon encore une autre variante de réalisation, le tube plat 21 est simplement baigné dans le fluide réfrigérant à basse pression qui s'écoule à l'intérieur d'un espace interstitiel ménagé entre deux spires consécutives de l'enroulement du tube plat 21 sur lui-même.The flat tube 21 is bordered by two secondary flat tubes 50 inside which circulates the refrigerant fluid at low pressure. According to another variant embodiment, the flat tube 21 is bordered by a single secondary flat tube 50, indifferently internal or external. According to yet another alternative embodiment, the flat tube 21 is simply bathed in the low-pressure refrigerant fluid which flows inside an interstitial space formed between two consecutive turns of the winding of the flat tube 21 on it -even.

Sur la fig.5, le collecteur « haute pression » central 48 est agencé en un tube central muni d'un bouchon inférieur 53, le collecteur « haute pression » périphérique 51 étant agencé en un tube périphérique pourvu d'un bouchon supérieur 54. L'échangeur de chaleur interne 5 comporte une platine supérieure 55 de recouvrement de l'enroulement du tube plat 21 et éventuellement du ou des tube(s) plat(s) secondaire(s) 50 et une platine inférieure 56 de recouvrement de l'enroulement du tube plat 21 et éventuellement du ou des tube(s) plat(s) secondaire(s) 50. La platine supérieure 55 et la platine inférieure 56 prennent respectivement appui contre des tranches supérieures 57 et inférieures 58 du tube plat 21 et éventuellement du ou des tube(s) plat(s) secondaire(s) 50.On the fig.5 , the central "high pressure" collector 48 is arranged in a central tube provided with a lower plug 53, the "high pressure" peripheral collector 51 being arranged in a peripheral tube provided with an upper plug 54. The heat exchanger internal 5 comprises an upper plate 55 covering the winding of the flat tube 21 and optionally the flat tube (s) flat (s) secondary (s) 50 and a lower plate 56 covering the winding of the flat tube 21 and possibly the secondary flat tube (s) 50. The upper plate 55 and the lower plate 56 take respectively support against the upper slices 57 and lower 58 of the flat tube 21 and optionally or the flat tube (s) secondary (s) 50.

Ladite platine supérieure 55 est pourvue d'un orifice 59 pour le passage à son travers du bouchon supérieur 54 qui émerge au-delà de la platine supérieure 55. La platine supérieure 55 est également munie d'une couronne centrale 60 ménagée sur une face extérieure 61 de la platine supérieure 55, ladite face extérieure 61 étant celle qui est exempte de contacts avec le tube plat 21 et éventuellement le ou les tube(s) plat(s) secondaire(s) 50. La couronne centrale 60 est pourvue d'une gorge de réception 62 d'un premier joint d'étanchéité, visible sur la fig.8. La couronne centrale 60 comporte un passage 63 pour la traversée du collecteur « haute pression » central 48. La platine supérieure 55 comporte enfin un trou oblong 100 dont la fonction est d'autoriser le passage de l'huile qui s'accumule entre la face externe 77 de la paroi de confinement 32 et la platine supérieure 55 pour la diriger vers la sortie « basse pression » 16, lors de l'utilisation du composant interne monobloc tel que montré aux figures 9 ou 10.Said upper plate 55 is provided with an orifice 59 for passing through the upper plug 54 which emerges beyond the upper plate 55. The upper plate 55 is also provided with a central ring 60 formed on an outer face 61 of the upper plate 55, said outer face 61 being that which is free of contact with the flat tube 21 and possibly the flat tube (s) or (s) secondary (s) 50. The central ring 60 is provided with a receiving groove 62 of a first seal, visible on the fig.8 . The central ring 60 has a passage 63 for the passage of the central "high pressure" collector 48. The upper plate 55 finally has an oblong hole 100 whose function is to allow the passage of the oil which accumulates between the face outer wall 77 of the confinement wall 32 and the upper plate 55 to direct it towards the "low pressure" outlet 16, when using the integral inner component as shown in FIGS. figures 9 or 10 .

La dite platine inférieure 56 est pourvue d'un trou 64 qui vient en-vis-à-vis de ladite sortie « basse pression » 16 pour l'évacuation du fluide réfrigérant hors du dispositif combiné 12 vers le compresseur 3. Ladite platine inférieure 56 est également munie de doigts 65 ménagés sur une tranche de ladite platine inférieure 56 pour leur emboitement à l'intérieur de fenêtres correspondantes 66 ménagées sur la jupe 45, lesdites fenêtres étant visibles sur la fig.6 Said bottom plate 56 is provided with a hole 64 which comes opposite said "low pressure" outlet 16 for the discharge of the refrigerant from the combined device 12 to the compressor 3. Said lower plate 56 is also provided with fingers 65 formed on a slice of said bottom plate 56 for their interlocking inside corresponding windows 66 formed on the skirt 45, said windows being visible on the fig.6

Sur la fig.6, la jupe 45 est pourvue d'une échancrure 67 pour le passage du fluide réfrigérant à basse pression de part et d'autre de la jupe 45, et permettre ainsi une récupération du fluide réfrigérant s'étant écoulé entre la jupe 45 et la paroi périphérique 29 de l'enceinte 26.On the fig.6 , the skirt 45 is provided with a notch 67 for the passage of the refrigerant fluid at low pressure on either side of the skirt 45, and thus allow a recovery of the refrigerant fluid having passed between the skirt 45 and the wall device 29 of the enclosure 26.

Sur la fig.7, la dite platine inférieure 56 est constituée de deux platines élémentaires 68,69, dont une platine élémentaire supérieure 68 et une platine élémentaire inférieure 69. Entre la platine élémentaire supérieure 68 et la platine élémentaire inférieure 69, une réserve d'huile 70 est ménagée. La platine élémentaire inférieure 69 est pourvue d'une échancrure radiale 71 pour la réception d'un filtre à huile 72.On the fig.7 said lower platen 56 consists of two elementary platens 68, 69, including an upper platinum element 68 and a platinum Lower elementary element 69. Between the upper elementary plate 68 and the lower elementary plate 69, a reserve of oil 70 is formed. The lower elementary plate 69 is provided with a radial notch 71 for receiving an oil filter 72.

Sur les fig.8 à fig.10, la paroi de confinement 32 comporte une face interne 73 qui est ménagée en vis-à-vis de la paroi de délimitation 31, la paroi de confinement 32 et la paroi de délimitation 31 étant globalement parallèles l'une à l'autre en étant sensiblement orthogonales au dit axe d'extension longitudinale Δ dudit dispositif combiné 12 et à un axe de symétrie Δ' du conduit 33.On the fig.8 to fig.10 , the confinement wall 32 has an internal face 73 which is formed opposite the delimiting wall 31, the confinement wall 32 and the delimiting wall 31 being generally parallel to each other while being substantially orthogonal to said longitudinal extension axis Δ of said combined device 12 and to an axis of symmetry Δ ' of the conduit 33.

Plus particulièrement sur la fig.8, la face interne 73 est convexe en étant vue depuis la paroi de délimitation 31, de telle sorte que l'huile de graissage accompagnant le fluide réfrigérant à l'état liquide puisse aisément s'écouler le long de la face interne 73 pour s'épandre entre la paroi périphérique 29 et la jupe 45, et regagner ladite sortie « basse pression » 16 à travers ladite échancrure radiale 71.More particularly on the fig.8 the inner face 73 is convex while being seen from the boundary wall 31, so that the lubricating oil accompanying the coolant in the liquid state can easily flow along the inner face 73 for s' spreading between the peripheral wall 29 and the skirt 45, and regaining said "low pressure" outlet 16 through said radial notch 71.

La paroi de confinement 32 comporte un bord interne 74 pourvu d'une première saignée 75 de réception dudit premier joint d'étanchéité 76 entre la paroi de confinement 32 et la couronne centrale 60 constitutive de l'échangeur de chaleur interne 5.The containment wall 32 has an inner edge 74 provided with a first groove 75 for receiving said first seal 76 between the confinement wall 32 and the central ring 60 constituting the internal heat exchanger 5.

La paroi de confinement 32 comporte une face externe 77, opposée à la face interne 73, qui est pourvue d'un évidement 78 pour le passage du bouchon supérieur 54 équipant le collecteur « haute pression » 51 de l'échangeur de chaleur interne 5.The containment wall 32 has an outer face 77, opposite to the inner face 73, which is provided with a recess 78 for the passage of the upper plug 54 fitted to the "high pressure" collector 51 of the internal heat exchanger 5.

Sur les fig.9 et fig.10, la face interne 73 est agencée en une cuvette comportant un centre de courbure C interposé entre la paroi de délimitation 31 et la paroi de confinement 32. Selon une autre forme de réalisation, le centre de courbure C est placé au-dessus de la paroi de délimitation 31. La cuvette 73 comporte un fond 79 agencé en une rigole de sorte à recueillir l'huile qui circule avec le fluide réfrigérant. Par ailleurs, la paroi de confinement 32 comporte un bord externe 80 pourvu d'une deuxième saignée 81 de réception d'un deuxième joint d'étanchéité 82 entre la paroi de confinement 32 et ladite paroi périphérique 29.On the fig.9 and fig.10 , the inner face 73 is arranged in a bowl having a center of curvature C interposed between the delimiting wall 31 and the confinement wall 32. According to another embodiment, the center of curvature C is placed above the delimiting wall 31. The bowl 73 comprises a bottom 79 arranged in a channel so as to collect the oil which circulates with the refrigerant. Moreover, the confinement wall 32 comprises an outer edge 80 provided with a second groove 81 for receiving a second seal 82 between the confinement wall 32 and said peripheral wall 29.

Sur la fig.9, un canal 83 est ménagé entre la face interne 73 et la face externe 77 de la paroi de confinement 32. Un tel canal 83 qui s'étend de la face interne 73 à la face externe 77 de la paroi de confinement 32 permet une réintégration de l'huile de graissage au niveau de la ladite sortie « basse pression » 16 du dispositif combiné 12, c'est-à-dire en aval de l'échangeur de chaleur interne 5 selon un sens de circulation 11 du fluide réfrigérant à l'intérieur de la boucle de climatisation 1. Ces dispositions limitent les pertes de charge à l'intérieur de l'échangeur de chaleur interne 5 consécutive à la présence de l'huile, ce qui est un avantage. On notera enfin la présence d'un chanfrein 101 pratiqué à la jonction entre la face externe 77 et le bord interne 74.On the fig.9 a channel 83 is formed between the inner face 73 and the outer face 77 of the containment wall 32. Such a channel 83 which extends from the inner face 73 to the outer face 77 of the confinement wall 32 allows reintegration lubricating oil at said "low pressure" outlet 16 of the combined device 12, that is to say downstream of the internal heat exchanger 5 in a direction of circulation 11 of the refrigerant to the The interior of the air-conditioning loop 1. These provisions limit the pressure drops inside the internal heat exchanger 5 consecutive to the presence of the oil, which is an advantage. Note finally the presence of a chamfer 101 made at the junction between the outer face 77 and the inner edge 74.

Sur la fig.10, un trou 84 est ménagé entre la face interne 73 et un volume interne 38 du conduit 33. Un tel trou 84 permet une réintégration de l'huile de graissage au niveau de ladite entrée 23 de la branche « basse pression » 10 de l'échangeur de chaleur interne 5, c'est-à-dire en amont de l'échangeur de chaleur interne 5 selon un sens de circulation 11 du fluide réfrigérant à l'intérieur de la boucle de climatisation 1.On the fig.10 , a hole 84 is formed between the inner face 73 and an internal volume 38 of the conduit 33. Such a hole 84 allows a reintegration of the lubricating oil at the inlet 23 of the branch "low pressure" 10 of the internal heat exchanger 5, that is to say upstream of the internal heat exchanger 5 in a direction of circulation 11 of the refrigerant inside the air conditioning loop 1.

Claims (15)

  1. Combined device (12) comprising an enclosure (26) consisting of a top partition (27), a bottom partition (28) and at least one peripheral wall (29), the said enclosure (26) housing an internal heat exchanger (5), a separation zone (19) and an accumulation zone (20), characterized in that the enclosure (26) also houses an internal one-piece component (30) which consists:
    - of a wall (31) for delimiting the separation zone (19) and the accumulation zone (20),
    - of a wall (32) for confinement of the internal heat exchanger (5) relative to the accumulation zone (20),
    - and of a duct (33) which connects the confinement wall (32) and the delimitation wall (31).
  2. Combined device (12) according to the preceding claim, characterized in that the duct (33) comprises a first end (34) fitted with a first opening (35) which is made through the delimitation wall (31) and a second end (36) fitted with a second opening (37) which is made through the confinement wall (32).
  3. Combined device (12) according to Claim 2, characterized in that the delimitation wall (31) is furnished with a collar (39) which surrounds the first opening (35).
  4. Combined device (12) according to Claim 3, characterized in that the collar (39) is tapered towards the separation zone (19).
  5. Combined device (12) according to any one of Claims 2 to 4, characterized in that the delimitation wall (31) is formed into a disc of which a centre (42) is furnished with the first opening (35) and of which a rim (43) is provided with at least one lug (44) for positioning the delimitation wall (31) against the peripheral wall (29) of the enclosure (26).
  6. Combined device (12) according to any one of the preceding claims, characterized in that the confinement wall (32) comprises an internal face (73) which is placed facing the separation wall (31).
  7. Combined device (12) according to Claim 6, characterized in that the internal face (73) is convex while being seen from the delimitation wall (31).
  8. Combined device (12) according to Claim 6, characterized in that the internal face (73) is arranged as a dish comprising a centre of curvature C, placed without distinction between the delimitation wall (31) and the confinement wall (32) or above the delimitation wall (31).
  9. Combined device (12) according to any one of the preceding claims, characterized in that the confinement wall (32) comprises an internal edge (74) provided with a first notch (75) for receiving a first seal (76) between the confinement wall (32) and a central ring (60) forming part of the internal heat exchanger (5).
  10. Combined device (12) according to any one of the preceding claims, characterized in that the confinement wall (32) comprises an external edge (80) provided with a second notch (81) for receiving a second seal (82) between the confinement wall (32) and the said peripheral wall (29).
  11. Combined device (12) according to any one of Claims 6 to 10, characterized in that at least one hole (84) is made between the internal face (73) and an internal volume (38) of the duct (33).
  12. Combined device (12) according to any one of Claims 6 to 10, characterized in that at least one capillary (83) is made between the internal face (73) and an external face (77) of the confinement wall (32), the external face (77) being opposite to the said internal face (73).
  13. Combined device (12) according to any one of the preceding claims, characterized in that the confinement wall (32) is provided with a skirt (45) in order to at least partially envelope the internal heat exchanger (5).
  14. Air conditioning loop (1) comprising a combined device (12) according to any one of the preceding claims.
  15. Air conditioning loop (1) according to Claim 14, through which a supercritical coolant travels, characterized in that:
    - the separation zone (19) constitutes a dissociation zone between a gaseous phase of the coolant and a liquid phase of the coolant, and
    - the accumulation zone (20) constitutes a storage zone of the liquid phase of the coolant originating from the separation zone (19).
EP09178157A 2008-12-22 2009-12-07 Combined device comprising an internal heat exchanger and an accumulator participating to an AC loop, the combined device being equipped with a multi-functions internal component. Active EP2199708B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0807423A FR2940419B1 (en) 2008-12-22 2008-12-22 COMBINED DEVICE COMPRISING AN INTERNAL HEAT EXCHANGER AND AN ACCUMULATOR, AND PROVIDED WITH A MULTIFUNCTIONAL INTERNAL COMPONENT

Publications (2)

Publication Number Publication Date
EP2199708A1 EP2199708A1 (en) 2010-06-23
EP2199708B1 true EP2199708B1 (en) 2011-10-26

Family

ID=40627549

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09178157A Active EP2199708B1 (en) 2008-12-22 2009-12-07 Combined device comprising an internal heat exchanger and an accumulator participating to an AC loop, the combined device being equipped with a multi-functions internal component.

Country Status (7)

Country Link
US (1) US9464831B2 (en)
EP (1) EP2199708B1 (en)
JP (1) JP5421091B2 (en)
CN (1) CN101762131B (en)
AT (1) ATE530865T1 (en)
ES (1) ES2375917T3 (en)
FR (1) FR2940419B1 (en)

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KR20230090753A (en) * 2021-12-15 2023-06-22 현대자동차주식회사 Heat exchanger and refrigerant moudule of integrated thermal management system for vehicle including the same

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Also Published As

Publication number Publication date
FR2940419A1 (en) 2010-06-25
FR2940419B1 (en) 2010-12-31
CN101762131B (en) 2014-10-29
ATE530865T1 (en) 2011-11-15
JP5421091B2 (en) 2014-02-19
EP2199708A1 (en) 2010-06-23
CN101762131A (en) 2010-06-30
JP2010143574A (en) 2010-07-01
ES2375917T3 (en) 2012-03-07
US9464831B2 (en) 2016-10-11
US20100155017A1 (en) 2010-06-24

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