EP3548824A1 - Dispositif d'homogénéisation de la distribution d'un fluide réfrigérant à l'intérieur de tubes d'un échangeur de chaleur constitutif d'un circuit de fluide réfrigérant - Google Patents
Dispositif d'homogénéisation de la distribution d'un fluide réfrigérant à l'intérieur de tubes d'un échangeur de chaleur constitutif d'un circuit de fluide réfrigérantInfo
- Publication number
- EP3548824A1 EP3548824A1 EP17816951.2A EP17816951A EP3548824A1 EP 3548824 A1 EP3548824 A1 EP 3548824A1 EP 17816951 A EP17816951 A EP 17816951A EP 3548824 A1 EP3548824 A1 EP 3548824A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- distribution
- mixing
- heat exchanger
- conduit
- refrigerant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
- F28F9/026—Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits
- F28F9/027—Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits in the form of distribution pipes
- F28F9/0273—Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits in the form of distribution pipes with multiple holes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
- F25B39/02—Evaporators
- F25B39/028—Evaporators having distributing means
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- 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
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
- F28D1/0535—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
- F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
Definitions
- the field of the present invention is that of the heat exchangers constituting a refrigerant circuit.
- refrigerant fluid equipping a motor vehicle.
- the subject of the invention is a device for homogenizing the distribution of a refrigerant fluid inside tubes of such a heat exchanger.
- a motor vehicle is commonly equipped with a ventilation, heating and / or air conditioning system for heat treating the air present or sent inside a passenger compartment of the motor vehicle. To do this, such an installation is associated with a closed circuit inside which circulates a refrigerant fluid.
- the refrigerant circuit comprises successively a compressor, a condenser or gas cooler, an expansion member and a heat exchanger.
- the heat exchanger is housed inside the ventilation, heating and / or air conditioning system to allow a heat exchange between the refrigerant and a flow of air circulating inside said installation, previously a delivery of the air flow inside the passenger compartment.
- heat exchanger is used as an evaporator to cool the air flow.
- the refrigerant is compressed inside the compressor, then the cooling fluid is cooled inside the condenser or gas cooler, then the refrigerant is expanded within the expansion device and finally the refrigerant captures calories to the airflow inside the heat exchanger.
- the refrigerant fluid at the outlet of the expansion member and at the inlet of the heat exchanger, is in the two-phase state and is present in a liquid phase and a gaseous phase.
- the heat exchanger comprises a header and a return box between which a bundle of tubes is interposed.
- the refrigerant is admitted inside the heat exchanger through an inlet mouth that includes the manifold. Then, the coolant flows between the manifold and the gearbox by borrowing the tubes of the beam.
- a general problem posed lies in the difficulty of feeding the tubes of the bundle homogeneously with respect to the different phases, liquid and gaseous, of the refrigerant fluid.
- a heterogeneity of supply of refrigerant fluid tubes of the beam generates a heterogeneity of the temperature of the air flow through the heat exchanger. This heterogeneity is likely to induce untimely and undesired temperature differences between zones of the passenger compartment, which is detrimental.
- the document US2015 / 0121950 proposes to house, inside the manifold, a device for homogenizing the distribution of the refrigerant fluid inside the tubes of the bundle.
- This device comprises a conduit provided with a plurality of orifices.
- the conduit has a first end portion which is in connection with a first inlet mouth of the refrigerant fluid inside the heat exchanger.
- the conduit is arranged in a cylindrical tube delimiting an internal volume in one piece within which circulates the refrigerant fluid.
- the coolant in the liquid phase is projected through the orifices formed through the conduit in the form of droplets.
- Such an organization is not optimal from the point of view of the homogenization of the coolant distribution inside the heat exchanger. More particularly, the tubes of the beam farthest from the first end portion are frequently underfed with refrigerant fluid. This results in a heterogeneity of the temperature of the air flow at the outlet of the heat exchanger, which is unsatisfactory.
- An object of the invention is to perfect the homogeneity of the coolant distribution inside the heat exchanger, in order to improve its efficiency and efficiency, in order to deliver inside the passenger compartment. a flow of air at the desired temperature.
- Another object of the invention is to improve the distribution of refrigerant inside the heat exchanger, including when the latter is present inside. of the heat exchanger under two distinct phases, liquid and gas, in respective variable proportion.
- Another object is to propose a device for distributing a refrigerant fluid inside the tubes of the bundle which provides an equivalent supply of refrigerant fluid to the tubes of the bundle, including those furthest away from the first end portion. duct, which receives the first coolant.
- Another object is to provide a device for dispensing a refrigerant fluid which is arranged to prevent the refrigerant from accumulating in a zone of the latter.
- a device of the present invention is a device for homogenizing the distribution of the refrigerant fluid inside tubes of a heat exchanger.
- the homogenization device of the distribution comprises a conduit provided with at least one window through which the coolant is able to enter the conduit and at least one orifice through which the coolant is able to exit the conduit.
- the duct houses at least one mixing device arranged to direct the cooling fluid from a center of the duct to an inner face of the duct.
- the homogenization device of the distribution advantageously comprises at least one of the following characteristics, taken alone or in combination:
- the duct delimits an internal volume within which at least partially extends the mixing device.
- the mixing member occupies the entire internal volume. It is understood here that a peripheral edge of the mixing member is in contact with an inner face of a peripheral wall of the conduit.
- the mixing member comprises at least one shaft equipped with at least one centrifugal wall. It is understood here that the centrifugal wall comes from the shaft and extends from the shaft to the peripheral edge of the mixing member.
- the shaft extends in the center of the duct.
- the center of the duct is contained inside the tree.
- an axis of the shaft coincides with the center of the duct.
- the centrifugal wall extends between the shaft and the inner face of the conduit.
- the inner face is smooth.
- the shaft is equipped with a plurality of centrifugal walls which are continuous between two longitudinal ends of the mixing member.
- each centrifugal wall extends between the shaft, a first leading edge, a second leading edge and a peripheral edge.
- Each centrifugal wall is a curved wall between the shaft, the first leading edge, the second leading edge and the peripheral edge.
- the centrifugal wall comprises mixing elements which are carried by the shaft and which are separated from each other by at least one notch. It is understood here that the centrifugal wall is a discontinuous wall comprising at least two mixing elements separated by at least one notch.
- the mixing elements are iteratively repeated along the shaft. It is understood here that mixing elements identical to each other are repeated one after the other along the shaft. The mixing elements succeed one another in being identical to each other and oriented in a similar manner in space with respect to each other.
- each mixing element is arranged in a helix portion.
- each mixing element extends between a first leading edge and a second leading edge which form between them a first angle of between 70 ° and 110 °.
- the first leading edge of a mixing element forms with a second leading edge of a mixing element adjacent a second angle between 70 ° and 110 °.
- Each mixing element comprises at least two identical mixing patterns and winding direction opposite to each other. It is understood here that the mixing element is a discontinuous wall comprising at least two mixing patterns separated by at least one groove.
- the mixing pattern extends between a first leading edge and a second leading edge, which are parallel to each other.
- the first leading edge of a mixing pattern forms with a second leading edge of a mixing pattern adjacent a third angle between 70 ° and 110 °.
- the homogenizing device comprises at least one duct provided with at least one window through which the coolant is able to enter the conduit and at least one orifice through which the coolant is able to exit the conduit.
- the conduit provides the refrigerant fluid a passage area.
- the orifice is of a first diameter.
- the duct houses at least one mixing device which is of a first length and a second diameter.
- the mixing member comprises a plurality of identical and repeated mixing elements along an axis of elongation. Each mixing element is one step away.
- a diameter ratio is defined by the ratio of the second diameter to the first diameter.
- a mixing ratio is defined by the ratio of the second diameter to the pitch.
- a surface ratio is defined as the ratio of the passage area to the first length. The surface ratio is between 0.02 and 1.38, the diameter ratio is between 0.2 and 50 and / or the mixing ratio is between 0.01 and 2.5.
- the homogenizing device advantageously comprises at least one of the following characteristics, taken alone or in combination:
- the surface ratio is greater than 0.28 and the diameter ratio is between
- the surface ratio is greater than 0.28 and the mixing ratio is between 0.25 and 2.5.
- the surface ratio is between 0.28 and 1.38 and the diameter ratio is between 10 and 50.
- the surface ratio is between 0.28 and 0.68 and the diameter ratio is between 10 and 50.
- the surface ratio is between 0.28 and 1.38 and the mixing ratio is between 0.4 and 2.5.
- the surface ratio is between 0.28 and 0.68 and the mixing ratio is between 0.4 and 2.5.
- the invention also relates to a header box defining a first chamber housing at least one such homogenization device of the distribution.
- the invention also relates to a heat exchanger comprising such a box collector and a gearbox between which is interposed a bundle of tubes.
- a heat exchanger of the present invention is a heat exchanger equipped with a device for homogenizing the distribution of refrigerant fluid inside tubes of the heat exchanger.
- the homogenizing device comprises at least one duct provided with at least one window through which the refrigerant fluid is able to enter the duct and at least one orifice through which the refrigerant fluid is able to exit the duct.
- the tubes provide the refrigerant with a passage section and a perimeter.
- the orifice is of a first diameter.
- the duct houses at least one mixing device which is of a second diameter.
- the mixing member comprises a plurality of identical and repeated mixing elements along an axis of elongation. Each mixing element is one step away.
- a diameter ratio is defined by the ratio of the second diameter to the first diameter.
- a mixing ratio is defined by the ratio of the second diameter to the pitch.
- a hydraulic diameter is defined by the ratio between four times the passage section divided by the perimeter. The hydraulic diameter being between 0.5 and 2.0, the diameter ratio is between 2.5 and 45 and / or the mixing ratio is between 0.25 and 2.5.
- the heat exchanger advantageously comprises at least one of the following features, taken alone or in combination:
- the hydraulic diameter being between 0.5 and 0.6, the diameter ratio is between 2.5 and 17.5.
- the hydraulic diameter being between 0.6 and 0.9, the diameter ratio is between 2.5 and 22.5.
- the hydraulic diameter being between 0.9 and 1.3, the diameter ratio is between 5 and 30.
- the hydraulic diameter being between 1.3 and 1.6, the diameter ratio is between 7.5 and 35.
- the hydraulic diameter being between 1.6 and 2
- the diameter ratio is between 10 and 45.
- the hydraulic diameter being between 0.5 and 1
- the mixing ratio is between 0.25 and 2.5.
- the invention also relates to a refrigerant fluid circuit comprising at least one such heat exchanger.
- the present invention also relates to a use of such a heat exchanger as an evaporator housed inside a housing of a ventilation, heating and / or air conditioning system equipping a motor vehicle.
- FIG. 1 is a schematic illustration of a refrigerant circuit comprising a heat exchanger of the present invention
- FIG. 2 is a diagrammatic perspective illustration of a first embodiment of a heat exchanger illustrated in FIG. 1;
- FIG. 3 is a diagrammatic perspective illustration of a second variant embodiment of a heat exchanger illustrated in FIG. 1;
- FIG. 4 is a diagrammatic perspective illustration of a first alternative embodiment of a device for homogenizing the distribution of the refrigerant fluid for equipping the heat exchanger shown in FIGS. 2 or 3;
- FIG. 5 is a diagrammatic perspective illustration of a second alternative embodiment of a device for homogenizing the distribution of the refrigerant fluid for equipping the heat exchanger shown in FIGS. 2 or 3,
- FIG. 6 is a diagrammatic perspective illustration of a section of the device for homogenizing the distribution of the refrigerant fluid represented in FIG. 5;
- FIG. 7 is a diagrammatic perspective illustration of a first variant of a mixer constituting the device for homogenizing the distribution of the refrigerant fluid represented in FIGS. 4 to 5
- FIG. 8 is a diagrammatic perspective illustration of a second variant of a mixer constituting the device for homogenizing the distribution of the refrigerant fluid represented in FIGS. 4 to 5;
- FIG. 9 is a diagrammatic perspective illustration of a third variant of a mixing device constituting the device for homogenizing the distribution of the refrigerant fluid represented in FIGS. 4 to 5,
- FIG. 10 is a detailed view of the mixing device represented in FIG. 9,
- FIG. 11 is a detailed view of the mixing device represented in FIG. 10,
- FIG. 12 is a detailed view of a constituent mixing pattern of the mixing device illustrated in FIGS. 9, 10 and 11.
- FIG. 1 there is shown a closed circuit 1 inside which circulates a refrigerant fluid FR.
- the refrigerant circuit 1 successively comprises, in a direction SI of circulation of the refrigerant fluid FR inside the refrigerant circuit 1, a compressor 2 for compressing the refrigerant fluid FR, a condenser or a gas cooler 3 for cooling the refrigerant FR, an expansion member 4 within which the cooling fluid FR undergoes expansion and a heat exchanger 5.
- the heat exchanger 5 is housed inside a housing 6 of a ventilation system 7, heating and / or air conditioning inside which circulates a flow of air.
- the heat exchanger 5 allows a heat transfer between the refrigerating fluid FR and the airflow FA coming into contact with it and / or passing through it, as illustrated in FIG. 2. According to the operating mode of the fluid circuit 1 described above, the heat exchanger 5 is used as an evaporator to cool the air flow FA, during the passage of the air flow FA to the contact and / or from one side of the heat exchanger 5.
- the heat exchanger 5 comprises a manifold 8 and a gearbox 9 between which a tube bundle 10, 10a, 10b is interposed.
- the heat exchanger 5 extends parallel to a first plane PI containing the manifold 8, the bundle of tubes 10, 10a, 10b and the return box 9.
- the manifold 8 overhangs the bundle of tubes 10, 10a, 10b, which are themselves located above the box of 9, in particular in the position of use of the heat exchanger 5 mounted inside the housing 6.
- the manifold 8 is an upper box of the heat exchanger 5 while the gearbox 9 is a lower box of the heat exchanger 5.
- the airflow FA flows through the heat exchanger 5 in a direction preferably orthogonal to the first plane Pl.
- the tubes 10, 10a, 10b are for example rectilinear and extend along a first axis of general extension A1 between the manifold 8 and the return box 9.
- the manifold 8 extends along a second axis of general extension A2 and the gearbox 9 extends along a third axis of general extension A3.
- the second axis of general extension A2 and the third axis of general extension A3 are mutually parallel, being orthogonal to the first axis of general extension Al.
- the bundle of tubes 10, 10a, 10b is provided with fins 15 which are interposed between two successive tubes 10, 10a, 10b, to promote a heat exchange between the air flow FA and the tubes 10, 10a, 10b, when a passage of the airflow FA through the heat exchanger 5, the airflow FA flowing in a direction substantially orthogonal to the first plane Pl.
- the heat exchanger 5 comprises a first mouth 16 through which the refrigerant fluid FR enters the interior of the heat exchanger 5.
- the first mouth 16 constitutes an intake port of the refrigerant fluid FR in a first chamber 13 which is defined inside the manifold 8.
- the heat exchanger 5 comprises a second mouth 17 through which the coolant FR is discharged out of the heat exchanger 5.
- heat exchanger 5 is a heat exchanger inside which the cooling fluid FR flows in a path arranged in "I”.
- the tubes 10 are arranged parallel to each other and are aligned inside the first plane Pl.
- the tubes 10 extend between a first end 101 which is in fluid communication with the 9 and a second end 102 which is in fluid communication with the manifold 8.
- the gearbox 9 forms the base of the "I" while the manifold 8 forms the top of the "I”.
- the second mouth 17 equips the return box 9.
- the refrigerant fluid FR enters the interior of the heat exchanger 5 through the first mouth 16 that includes the manifold 8. Then, the refrigerant fluid FR is distributed along the manifold 8 along the second extension axis A2 by a homogenization device of the distribution 18. Then, the refrigerant fluid FR flows between the manifold 8 and the return box 9 by borrowing the 10. Finally, the refrigerant FR is discharged out of the heat exchanger 5 through the second mouth 17 of the return box 9.
- the heat exchanger is a heat exchanger inside which the refrigerant fluid FR flows in a path arranged in "U".
- the tubes 10a, 10b are arranged parallel to each other by being distributed in two plies 11, 12, including a first ply 11 of first tubes 10a and a second ply 12 of second tubes 10b.
- the first ply 11 and the second ply 12 are formed inside respective planes which are parallel to each other and parallel to the first plane Pl.
- the first tubes 10a of the first ply 11 extend between a first end 101 which is in fluid communication with the return box 9 and a second end 102 which is in fluid communication with the first chamber 13.
- the second tubes 10b of the second ply 12 extend between a third end 103 which is in fluid communication with the deflection box 9 and a fourth end 104 which is in fluid communication with a second chamber 14, also delimited inside the manifold 8.
- the first chamber 13 and the second chamber 14 are contiguous and sealed with each other.
- the first chamber 13 extends along a fourth axis of general extension A4 and the second chamber 14 extends along a fifth axis of general extension A5.
- the fourth axis of general extension A4 and the fifth axis of general extension A5 are parallel to each other and parallel to the second axis of general extension A2.
- the fourth axis of general extension A4 and the fifth axis of general extension A5 together define a second plane P2, which is preferably orthogonal to the first plane Pl.
- the gearbox 9 forms the base of the "U” while the first ply 11 and the second ply 12 of tubes 10a, 10b form the branches of " U ", the first chamber 13 and the second chamber 14 forming the ends of the" U ".
- the second mouth 17 equips the second chamber 14 of the manifold 8.
- the refrigerant FR enters the interior of the heat exchanger 5 through the first mouth 16 of the first chamber 13, being distributed along the box 8 by the second axis of general extension A2 by the homogenization device of the distribution 18. Then, the refrigerant FR flows between the first chamber 13 of the manifold 8 and the return box 9 by borrowing the first tubes 10a of the first ply 11. Then, the refrigerant FR flows between the return box 9 and the second chamber 14 by taking the second tubes 10b of the second ply 12. Finally, the refrigerant FR is discharged out of the heat exchanger 5 through the second mouth 17, after having passed through the second chamber 14.
- a first tube 10a of the first ply 11 is aligned with a second tube 10b of the second ply 12 inside a third plane P3 which is perpendicular to the first plane P1 and which is parallel to the first axis of general extension
- the manifold 8 houses the homogenization device of the distribution 18 of the refrigerant FR inside the tubes 10, 10a, 10b.
- a homogenization device of the distribution 18 is intended to homogeneously distribute the refrigerant fluid FR, in the two-phase liquid-gas state, along the manifold 8 and ultimately within the set of tubes 10, 10a, 10b.
- Such a homogenization device of the distribution 18 is more particularly intended to homogeneously distribute the refrigerant fluid FR inside the heat exchanger 5, including when the refrigerant fluid FR is present inside the heat exchanger 5 in two distinct phases, liquid and gas, in respective variable proportion.
- the homogenization device of the distribution 18 comprises, for example, a duct 19 extending along a sixth axis of general extension A6, parallel to or even coincidental with the second axis of extension. A2 and / or the fourth axis of general extension A4, between a first end portion 20 and a second end portion 21 of the duct 19.
- any element extending along the sixth axis of general extension A6 is defined as longitudinal, which is defined by the largest dimension of the duct 19.
- the term transversal is understood to mean any element that extends inside the duct.
- a transverse plane Pt which is orthogonal to the general extension axis A6.
- the first end portion 20 is formed of one end of the conduit 19, while the second end portion 21 is formed of the other end of the conduit 19, longitudinally opposite the first terminal part 20.
- the first end portion 20 is intended to be placed in fluid communication with the first mouth 16 of the heat exchanger 5.
- the first mouth 16 houses the conduit 19, the first end portion 20 is placed in fluid communication with a pipe of the refrigerant circuit 1.
- the second end portion 21 is blind and forms a cul-de-sac with regard to the circulation of the refrigerant fluid FR to the 19.
- the duct 19 is for example formed in a cylinder, or in a parallelepiped or in any other form having an axis of symmetry A7, which is preferably parallel to or even coincident with the sixth axis of general extension A6.
- the duct 19 comprises a peripheral wall 23 which is of cylindrical cross section when the duct 19 is in the form of a cylinder of parallelepipedal cross section when the duct 19 is a parallelepiped.
- the peripheral wall 23 is that which gives the overall shape of the duct 19.
- the peripheral wall 23 comprises at least openings 22 which are provided at through the peripheral wall 23 of the conduit 19.
- the orifices 22 are preferably aligned along an alignment axis A8 which is parallel to the sixth axis of general extension A6 and / or the axis of symmetry A7.
- the orifices 22 are equidistant from one another.
- the orifices 22 are spaced from each other by a variable distance.
- the orifices 22 are for example orifices of circular section, but are likely to be of any conformation, rectangular, elliptical, oblong in particular.
- the conduit 19 constitutes an envelope which delimits an internal space 24 around which the conduit 19 is formed.
- the duct 19 borders the internal space 24 that the duct 19 surrounds.
- the internal space 24 is for example cylindrical or parallelepipedic, or of any other shape formed around the axis of symmetry A7.
- the peripheral wall 23 of the duct 19 has an inner face 23a which abuts and delimits the internal space 24, the inner face 23a preferably being of circular cross section.
- the conduit 19 houses a mixing device 25 which extends inside the internal space 24.
- the mixing device 25 is intended to favor a mixture between the liquid and gaseous phases of the refrigerant fluid FR.
- the mixing member 25 is especially designed to direct the refrigerant fluid FR from a center C of the conduit 19 to the inner face 23a of the conduit 19.
- the mixing member 25 is more particularly arranged to direct the refrigerant fluid FR from the center C of the conduit 19 to the inner face 23a of the latter.
- the mixing member 25 is a member allowing and facilitating a particularly centrifugal circulation of the refrigerant fluid FR from the center C of the conduit to the inner face 23a of the latter.
- the mixing member 25 is also provided to prevent an accumulation of refrigerant in the liquid state in a lower zone of the conduit 19, in the position of use of the latter.
- the mixing member 25 is also provided to disrupt a laminar flow of the refrigerant fluid FR inside the conduit 19, for mixing the liquid and gas phases of the refrigerant fluid FR.
- the mixing member 25 forms at least one baffle and preferably a plurality of baffles against a laminar flow, parallel to the sixth axis of general extension A6 and / or to the axis of symmetry A7. In its generality, the mixing member 25 forms an obstacle to the laminar flow of the refrigerant fluid FR inside the internal space 24.
- the mixing member 25 is longitudinally extended along the sixth axis of general extension A6 of the duct 19. According to embodiments shown in FIGS. 4 to 12, the mixing member 25 is arranged around a seventh axis of general extension A9, preferably parallel to or even coincident with the axis of symmetry A7 of the duct 19, when the mixing member 25 is positioned inside the duct 19, as illustrated in FIGS. 4 to 6.
- the mixing member 25 extends inside the whole of the internal space 24. In other words, the mixing member 25 fills the entire volume defined by the 19. In other words, the mixing member 25 has a conformity and / or geometry similar to that of the internal space 24. According to the variants described above, the mixing member 25 is capable of being of cylindrical or parallelepipedal shape, or of any other shape formed around the axis of symmetry A7. It will be understood that such a shape is defined globally by a peripheral edge 31 of the mixing member 25. The peripheral edge 31 of the mixing member 25 is formed by the surfaces of the mixing member 25 which are arranged with respect to the conduit 19.
- the inner face 23a of the peripheral wall 23 is preferably smooth to allow easy introduction of the mixing member 25 inside the conduit 19, the peripheral edge 31 of the mixing member 25 bearing against the inner face 23a. This characteristic of the inner face 23a is particularly advantageously when the mixing member 25 fills the entire volume defined by the conduit 19, as illustrated in FIG. 4.
- the mixing member 25 only partially encapsulates the internal space 24, an interstitial space 26 being formed between the mixing member 25 and the inside wall 23a of the duct 19.
- interstitial space 26 facilitates a flow of refrigerant FR parallel to the sixth axis of general extension A6 inside the conduit 19.
- the refrigerant fluid FR does not encountering any obstacle within the interstitial space 26 which facilitates the longitudinal circulation of the refrigerant fluid FR along the sixth axis of general extension A6, the mixing member 25 improving the transverse circulation of the refrigerant fluid FR since the center C of the conduit 19 to the inner face 23a.
- the interstitial space 26 is of a volume which is smaller than the volume of the mixing member 25.
- the volume of the interstitial space 26 is less than half the volume of the mixing member 25, or even less than one third of the volume of the mixing member 25, or even less than a quarter of the mixing member 25.
- Such an arrangement nevertheless allows the mixing member 25 to sufficiently disturb the flow refrigerant FR to remove the latter any laminar character, including in the presence of the interstitial space 26.
- the conduit 19 is provided with two end walls 27, 28, including a first end wall 27 fitted to the first end portion 20 and a second end wall 28 fitted to the second end portion 21.
- the first end wall 27 and the second end wall 28 are for example flat and arranged along the transverse plane Pt orthogonal to the sixth axis of general extension A6 and / or the axis of symmetry A7.
- the first end wall 27 and the second end wall 28 are for example derived from a lid at least partially covering the collecting box 8.
- the first end wall 27 is equipped with at least one window 29 for the admission of the refrigerant fluid FR into the interior space 24.
- the first end wall 27 of the duct 19 is equipped with the window 29 which is for example in fluid relation with the first mouth 16 to admit the refrigerant fluid FR inside the heat exchanger 5 via the conduit 19.
- the refrigerant fluid FR is admitted to the inside the heat exchanger 5 through the conduit 19 provided with the orifices 22 through which the refrigerant fluid FR is able to be discharged from the conduit 19 to circulate inside the heat exchanger 5 .
- the interstitial space 26 is provided between, on the one hand, the mixing member 25 and, on the other hand, the peripheral wall 23, the first end wall 27 and the second end wall 28.
- the interstitial space 26 forms a volume that surrounds the mixing member 25.
- the mixing member 25 comprises a first longitudinal end 31a which can be attached to the first wall terminal 27 of the duct 19.
- the mixing member 25 comprises a second longitudinal end 31b which can be attached to the second end wall 28.
- the interstitial space 26 is formed between the mixing member 25 and the peripheral wall 23, the mixing member 25 being attached to the first end wall 27 and the second end wall 28.
- the interstitial space 26 forms a cylindrical sleeve around the mixing member 25.
- the mixing member 25 is fixed at its longitudinal ends 31a, 31b respectively to the first end wall 27 and to the second end wall 28.
- the refrigerating fluid FR penetrating inside the heat exchanger 5 penetrates inside the internal space 24 by borrowing the window 29 formed through the first end wall 27. Then, the refrigerating fluid FR spreads inside the internal space 24 by being mixed by the mixing member 25. This results in particular a mixing of the liquid and gas phases of the refrigerating fluid FR which is then homogenized longitudinally, the along the conduit 19. Then, the refrigerant FR borrows the orifices 22 to flow out of the conduit 19 to the first chamber 13. Then, the refrigerant fluid FR flows through the bundle of tubes 10, 10a, 10b, as described above, up to the return box 9, to be discharged out of the heat exchanger 5 through the second mouth 17.
- the refrigerant fluid During transit of the refrigerant FR through the conduit 19 as well equipped with mixing member 25, the refrigerant fluid encounters multiple obstacles that promote a mixture between its liquid and gas phases. In addition, such a duct 19 promotes homogenization of the distribution of the refrigerant fluid FR inside the tubes 10, 10a, 10b.
- the refrigerating fluid FR is all the better sprayed, and homogeneously, as it passes through the orifices 22, that the two phases of the refrigerant fluid FR, liquid and gas, are mixed by the mixing member 25 inside of the internal space 24 of the duct 19, in order to then supply homogeneously the bundle of tubes 10, 10a, 10b.
- the mixing member 25 allows a longitudinal distribution of the cooling fluid FR which is homogeneous along the axis of symmetry A7, the spraying of the refrigerant FR through the orifices 22 taking place in the a second step, after homogenization of the refrigerant fluid FR in the internal space 24, which ensures a better homogeneous distribution of the refrigerant fluid FR at the outlet of the conduit 19, and consecutively inside the heat exchanger 5.
- the mixing member 25 comprises a shaft 29 carrying at least one centrifugal wall 30.
- the shaft 29 preferably extends longitudinally in a center C of the duct 19 along the seventh axis of general extension A9 of the mixing member 25.
- the center C of the duct 19 corresponds to a central zone of the latter, for example cylindrical, and in particular homothetic to a shape of the duct 19.
- the shaft 29 is in particular of the same conformation as the duct 19.
- the shaft 29 is also cylindrical being formed at the center C of the conduit 19.
- the shaft 29 consists of a central core of the mixing member 25 forming a continuity of material from the first longitudinal end 31a to the second longitudinal end 31b.
- the shaft 29 is for example disposed transversely to the barycentre of the mixing member 25.
- the shaft 29 is preferably shaped as a straight rod from which the centrifugal wall 30 extends.
- the centrifugal wall 30 extends from the shaft 29 to the peripheral edge 31 of the mixing member.
- the centrifugal wall 30 is for example unique and extends from the first longitudinal end 31a of the mixing member 25 to the second longitudinal end 31b of the mixing member 25. In such a case, the centrifugal wall 30 is considered continuous between the two longitudinal ends 31a, 31b of the mixing member 25, as shown in Figures 6 and 7.
- the centrifugal wall 30 is for example discontinuous. It is understood here that mixing elements 32 constituting the centrifugal wall 30 are separated one by one others by notches 33, visible for example in Figures 9 to 11.
- the mixing elements 32 are for example identical to each other and iteratively repeated along the axis of symmetry A7. In other words, the mixing elements 32 are for example similar to each other and geometrically substitutable with each other without modifying the conformation of the mixing member 25.
- the mixing elements 32 are for example repeated one after the other being identical to each other which gives the mixing member 25 a geometric homogeneity from the first longitudinal end 31a to the second longitudinal end 31b.
- Each mixing element 32 is for example still formed of two mixing patterns 34, identical to each other but abutted head to tail along the axis of symmetry A7.
- the centrifugal wall 30 is unique and is wound longitudinally along the shaft 29.
- the mixing device 25 is then shaped into a helical screw comprising a single thread formed of the centrifugal wall 30 and a central core formed of the shaft 29.
- the pitch of the helix is for example determined so that a pitch feeds an orifice 22. In other words, the pitch of the helix is equal to a distance between two adjacent orifices 22 of the duct 19.
- the mixing device 25 comprises a plurality of centrifugal walls 30 which are continuous from the first longitudinal end 31b to the second longitudinal end 31b and which are wound longitudinally along the shaft 29.
- the mixing member 25 has six centrifugal walls 30 equidistant from each other longitudinally.
- the mixing member 25 is in the form of a helical screw comprising, for example, six threads formed by the six centrifugal walls 30 and a central core formed by the shaft 29.
- the pitch of the propellers is equal to one helix to another.
- the pitch of the propellers is equal to a distance between two adjacent orifices 22 of the duct 19.
- the centrifugal wall 30 comprises a plurality of mixing elements 32 separated from each other by notches 33.
- the mixing elements 32 are identical to one another and iteratively repeated along the seventh axis of general extension A9. In other words, the mixing elements 32 are successively butted to each other on the tree 29.
- Each mixing element 32 extends longitudinally between a first leading edge 35 and a second leading edge 36.
- the first leading edge 35 and the second leading edge 36 are each formed of an edge of the centrifugal wall 30 which is substantially orthogonal to the shaft 29 and which delimits the centrifugal wall 30 facing the notches 33.
- the first leading edge 35 and the second leading edge 36 are longitudinally opposite one another along the seventh axis of general extension A9.
- the first leading edge 35 and the second leading edge 36 of a mixing element 32 form between them a first angle ⁇ of between 70 ° and 110 °, preferably equal to 90 °.
- a first leading edge 35 of a mixing element 32 forms with a second leading edge 36 of a mixing element 32 adjacent a second angle ⁇ between 70 ° and 110 °, preferably equal to 90 °.
- Each mixing element 32 is for example formed of two mixing patterns 34, identical to each other but abutted head-to-tail along the axis of symmetry A7.
- a winding direction of a mixing pattern 34 is opposite to a winding direction of an adjacent mixing pattern 34 constituting the mixing element 32.
- the centrifugal wall 30 of one rotates in a clockwise direction and the centrifugal wall 30 of the other rotates counterclockwise.
- FIG. 12 there is shown a mixing pattern 34 of the mixing element 34 illustrated in FIGS. 10 and 11, the centrifugal wall 30 of which is shaped as a helical portion formed around the shaft 29.
- Each element mixer 32 extends longitudinally between a first leading edge 35 'and a second leading edge 36'.
- the first leading edge 35 'and the second leading edge 36' are each formed by a ridge of the centrifugal wall 30 which is substantially orthogonal to the shaft 29 and which delimits the centrifugal wall 30 with respect to a groove 37 formed between two mixing patterns 34.
- the first leading edge 35 'and the second leading edge 36' are longitudinally opposite each other along the seventh axis of general extension A9.
- first leading edge 35 'and the second leading edge 36' of a mixing pattern 34 are parallel.
- a first leading edge 35 'of a mixing pattern 34 forms with a second leading edge 36' of an adjacent mixing pattern 34 participating in the same mixing element 32 a third angle ⁇ between 70 ° and 110 °, preferably equal to 90 °.
- the mixing member 25 is especially obtained by molding a polymer.
- the mixing member 25 is a one-piece element gathering the shaft 29 and the mixing elements 32, in one piece, which can only be dismantled in several elements from a destruction of the mixing member 25.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
Claims
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1661754A FR3059414B1 (fr) | 2016-11-30 | 2016-11-30 | Dispositif d’homogeneisation de la distribution d’un fluide refrigerant a l’interieur de tubes d’un echangeur de chaleur constitutif d’un circuit de fluide refrigerant |
| FR1661755A FR3061282B1 (fr) | 2016-11-30 | 2016-11-30 | Echangeur de chaleur constitutif d’un circuit de changeur fluide refrigerant |
| FR1661742A FR3059394B1 (fr) | 2016-11-30 | 2016-11-30 | Dispositif d’homogeneisation de la distribution d’un fluide refrigerant a l’interieur de tubes d’un echangeur de chaleur constitutif d’un circuit de fluide refrigerant |
| PCT/FR2017/053312 WO2018100308A1 (fr) | 2016-11-30 | 2017-11-30 | Dispositif d'homogénéisation de la distribution d'un fluide réfrigérant à l'intérieur de tubes d'un échangeur de chaleur constitutif d'un circuit de fluide réfrigérant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3548824A1 true EP3548824A1 (fr) | 2019-10-09 |
| EP3548824B1 EP3548824B1 (fr) | 2023-03-29 |
Family
ID=60702818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP17816951.2A Active EP3548824B1 (fr) | 2016-11-30 | 2017-11-30 | Dispositif d'homogénéisation de la distribution d'un fluide réfrigérant à l'intérieur de tubes d'un échangeur de chaleur constitutif d'un circuit de fluide réfrigérant |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3548824B1 (fr) |
| CN (1) | CN110168305A (fr) |
| WO (1) | WO2018100308A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113819774A (zh) * | 2021-08-30 | 2021-12-21 | 南京航空航天大学 | 一种提高流动均匀性的换热装置 |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1537553A (en) * | 1924-06-10 | 1925-05-12 | Samuel W Rushmore | Radiator |
| JPS60158294A (ja) * | 1984-01-30 | 1985-08-19 | Mitsubishi Heavy Ind Ltd | 燃料改質装置 |
| WO2002072254A2 (fr) * | 2001-03-12 | 2002-09-19 | Bhr Group Limited | Appareil reacteur, entree de melange et procedes |
| CN1536316A (zh) * | 2003-04-11 | 2004-10-13 | 乐金电子(天津)电器有限公司 | 热交换器的制冷剂均匀分配装置 |
| US7331195B2 (en) * | 2004-10-01 | 2008-02-19 | Advanced Heat Transfer Llc | Refrigerant distribution device and method |
| JP2006336890A (ja) * | 2005-05-31 | 2006-12-14 | Calsonic Kansei Corp | インタークーラ |
| US20100089559A1 (en) * | 2006-10-13 | 2010-04-15 | Carrier Corporation | Method and apparatus for improving distribution of fluid in a heat exchanger |
| CN102564204B (zh) * | 2010-12-08 | 2016-04-06 | 杭州三花微通道换热器有限公司 | 制冷剂分配装置和具有它的换热器 |
| WO2013172181A1 (fr) * | 2012-05-17 | 2013-11-21 | 三菱電機株式会社 | Échangeur de chaleur, et dispositif de cycle frigorifique |
| US9568225B2 (en) | 2013-11-01 | 2017-02-14 | Mahle International Gmbh | Evaporator having a hybrid expansion device for improved aliquoting of refrigerant |
| US10234181B2 (en) * | 2013-11-18 | 2019-03-19 | Carrier Corporation | Flash gas bypass evaporator |
-
2017
- 2017-11-30 CN CN201780082992.9A patent/CN110168305A/zh active Pending
- 2017-11-30 EP EP17816951.2A patent/EP3548824B1/fr active Active
- 2017-11-30 WO PCT/FR2017/053312 patent/WO2018100308A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| EP3548824B1 (fr) | 2023-03-29 |
| CN110168305A (zh) | 2019-08-23 |
| WO2018100308A1 (fr) | 2018-06-07 |
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