FR3059398A1 - Device for dispensing a refrigerant fluid inside a collector box of a heat exchanger for an air conditioning installation of a vehicle - Google Patents

Device for dispensing a refrigerant fluid inside a collector box of a heat exchanger for an air conditioning installation of a vehicle Download PDF

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Publication number
FR3059398A1
FR3059398A1 FR1661748A FR1661748A FR3059398A1 FR 3059398 A1 FR3059398 A1 FR 3059398A1 FR 1661748 A FR1661748 A FR 1661748A FR 1661748 A FR1661748 A FR 1661748A FR 3059398 A1 FR3059398 A1 FR 3059398A1
Authority
FR
France
Prior art keywords
conduit
plates
collector box
heat exchanger
cell
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.)
Pending
Application number
FR1661748A
Other languages
French (fr)
Inventor
Jeremy Blandin
Julien Tissot
Kamel Azzouz
Jerome Mougnier
Patrick Leblay
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
Original Assignee
Valeo Systemes Thermiques SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valeo Systemes Thermiques SAS filed Critical Valeo Systemes Thermiques SAS
Priority to FR1661748 priority Critical
Priority to FR1661748A priority patent/FR3059398A1/en
Publication of FR3059398A1 publication Critical patent/FR3059398A1/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02Header boxes; End plates
    • F28F9/026Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits
    • F28F9/027Header 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
    • F28F9/0273Header 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B39/00Evaporators; Condensers
    • F25B39/02Evaporators
    • F25B39/028Evaporators having distributing means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00Heat-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
    • F28D1/02Heat-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
    • F28D1/03Heat-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 plate-like or laminated conduits
    • F28D1/0308Heat-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 plate-like or laminated conduits the conduits being formed by paired plates touching each other
    • F28D1/0325Heat-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 plate-like or laminated conduits the conduits being formed by paired plates touching each other the plates having lateral openings therein for circulation of the heat-exchange medium from one conduit to another
    • F28D1/0333Heat-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 plate-like or laminated conduits the conduits being formed by paired plates touching each other the plates having lateral openings therein for circulation of the heat-exchange medium from one conduit to another the plates having integrated connecting members
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0031Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
    • F28D9/0043Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another

Abstract

The invention relates to a collector box of a refrigerant fluid for a heat exchanger, the collector box comprising: - a stack of plates (26), each plate (26) comprising at least a portion (25a, 25b) on which at least an opening (29) is provided, each opening (29) being delimited by an edge (30), a stack of portions (25a, 25b) delimiting a chamber which houses a dispensing device (18a) for the cooling fluid, - the device dispenser (18a) comprising at least one duct (14) of longitudinal axis (A1), the duct (14) having a plurality of orifices (17) distributed along the longitudinal axis (A1), characterized in that the conduit (14) is in contact at least in part with a plurality of edges (30) delimiting the openings (29), the chamber being at least partially compartmentalized in a stacking direction (D4) of the plates (26) in a plurality of cells (31), each cell (31) being delimited by the conduit (14) and a pair of plates (26).

Description

© Publication number: 3,059,398 (to be used only for reproduction orders) (© National registration number: 16 61748 ® FRENCH REPUBLIC

NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY

COURBEVOIE © Int Cl 8 : F28 D 1/00 (2017.01), F 28 D 21/00, F25 B 39/02

A1 PATENT APPLICATION

©) Date of filing: 30.11.16. (© Priority: © Applicant (s): VALEO THERMAL SYSTEMS Simplified joint stock company - FR. ©) Date of public availability of the request: 01.06.18 Bulletin 18/22. @ Inventor (s): BLANDIN JEREMY, TISSOT JULIEN, AZZOUZ KAMEL, MOUGNIER JEROME and LEBLAY PATRICK. (56) List of documents cited in the preliminary search report: See the end of this brochure (© References to other related national documents: ® Holder (s): VALEO THERMAL SYSTEMS Simplified joint-stock company. ©) Extension request (s): © Agent (s): VALEO THERMAL SYSTEMS. © DEVICE FOR DISTRIBUTING A REFRIGERANT FLUID INSIDE A COLLECTOR BOX OF A HEAT EXCHANGER FOR A VEHICLE AIR CONDITIONING SYSTEM. (57) The invention relates to a manifold of a coolant for a heat exchanger, the manifold 27 ^ 26} 25a

FR 3 059 398 - A1 including:

a stack of plates (26), each plate (26) comprising at least one portion (25a, 25b) on which at least one opening (29) is provided, each opening (29) being delimited by an edge (30), a stack of portions (25a, 25b) delimiting a chamber which houses a distribution device (18a) for the refrigerant,

- the distribution device (18a) comprising at least one conduit (14) with a longitudinal axis (A1), the conduit (14) comprising a plurality of orifices (17) distributed along the longitudinal axis (A1), characterized in that the duct (14) is in contact at least in part with several edges (30) delimiting the openings (29), the chamber being at least partially compartmentalized in a stacking direction (D4) of the plates (26) in a plurality of cells (31), each cell (31) being delimited by the conduit (14) and a pair of plates (26).

12

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Device for distributing a coolant inside a manifold of a heat exchanger for a vehicle air conditioning installation

The field of the present invention is that of heat exchangers equipping air conditioning installations for a vehicle, in particular an automobile. The invention relates more specifically to the methods of distributing a refrigerant fluid inside a manifold that includes such a heat exchanger.

A vehicle is commonly equipped with an air conditioning installation for heat treatment of the air present or sent into the passenger compartment of the vehicle. Such an installation comprises a closed circuit inside which a coolant circulates. Following the direction of circulation of the coolant through it, the circuit essentially comprises a compressor, a condenser, a pressure reducer and at least one heat exchanger.

The heat exchanger commonly comprises a bundle of tubes interposed between a manifold and a return box for the refrigerant. The refrigerant is admitted through an inlet mouth inside a manifold box, circulates in successive paths in the tubes of the bundle between the manifold box and a return box, then is discharged out of the disconnector thermal through an outlet. The outlet mouth may be formed through the manifold or through the return box.

The heat exchanger is for example an evaporator providing a heat exchange between the refrigerant and an air flow passing through it. In this case, the refrigerant circulates inside the tubes of the bundle and the air flow circulates along the tubes of the bundle for its refr oi d issem en t.

One problem is that the refrigerant is in the liquid / gaseous dipbasic state when it is admitted inside the heat exchanger. Due to the difference between the physical properties between the liquid and the gas, the refrigerant tends to separate between its liquid phase and its gas phase.

This results in a heterogeneity of the supply of the tubes of the bundle with regard to the different phases of the coolant, depending on their position relative to the inlet of the coolant inside the manifold. More particularly, the tubes of the bundle located closest to the inlet mouth are mainly supplied with liquid and conversely the bundle tubes furthest from the inlet mouth are mainly supplied with gas.

This phenomenon generates a heterogeneity in the temperature of the air flow which has passed through the heat exchanger in operation. This heterogeneity complicates the thermal management of the device that receives the heat exchanger and ultimately involves temperature differences between two areas of the passenger compartment, while the same air flow temperature is requested.

It is known to house a conduit provided with a plurality of orifices inside a manifold. The liquid phase refrigerant is thus sprayed through the orifices in the form of droplets over the entire length of the duct, as shown in document EP 2 392 886 (DELPHI TECH INC).

However, such an organization is not optimal from the point of view of the homogenization of the temperature of the air flow leaving the heat exchanger.

The present invention relates to a manifold of a refrigerant fluid for a heat exchanger comprising a device for distributing a coolant fluid inside the manifold. The invention also relates to a heat exchanger equipped with a manifold according to the invention. The heat exchanger is in particular arranged to equip an air conditioning installation of a vehicle, in particular an automobile.

An object of the invention is to perfect the uniformity of the temperature of the heat exchanger in operation and finally to improve its efficiency. It is more specifically targeted by the invention to perfect the distribution of the refrigerant in the manifold via the distribution device in a homogeneous manner between its liquid phase and its gaseous phase.

It is even more specifically targeted by the invention to provide a homogeneous supply of cooling fluid to the tubes of the bundle interposed between the manifold and the return box of the heat exchanger. It is particularly intended to provide a manifold capable of supplying refrigerant to the tubes of the bundle of tubes that includes the thermal exchanger, by providing efficient homogenization of the refrigerant between its liquid base and its gas phase, and a homogeneous distribution. coolant inside each of the tubes of the heat exchanger bundle.

Another object of the invention is to propose a manifold comprising a device for distributing the coolant which can be obtained industrially at low cost.

Another object of the invention is to provide a manifold comprising a device for distributing the refrigerant, the organization of which allows its easy adaptation and at low cost to heat exchangers of various structures.

Such a diversity of structures of the heat exchangers is in particular to be appreciated with regard to the number of tubes of the bundle which they comprise, the modalities of circulation of the refrigerant fluid inside the heat exchanger and / or relative positions between the mouth inlet and outlet of the refrigerant contained in the heat exchanger.

The manifold of the invention is at least partially formed of a stack of plates comprising at least one portion in which at least one opening is formed. Each opening is delimited by an edge. The stacking of the portions, resulting from the stacking of the plates, delimits a chamber housing a device for distributing the coolant. The dispensing device comprises at least one duct with a longitudinal axis comprising a plurality of orifices distributed along the longitudinal axis of the duct or the length of the duct. These holes allow the evacuation of the refrigerant towards the chamber.

The refrigerant has been previously admitted into the distribution device through an inlet mouth with which the duct is provided. More specifically, the inlet mouth allows the admission of the refrigerant fluid inside the distribution device.

The distribution device extends in the stacking direction of the plates through the openings that the portions comprise.

Thus, the refrigerant fluid sprayed through the orifices of the duct is discharged from the distribution device towards the chamber delimited by the plates, in particular by the portions.

According to the invention, the duct is in contact at least partially with the edge of several openings. The chamber is at least partially compartmentalized in the stacking direction of the plates into a plurality of cells. Each cell is delimited by the conduit and a pair of plates.

The refrigerant discharged from the distribution device to the cell is contained inside the cell and circulates in a space surrounding the duct. At least one tube from a bundle of tubes of the heat exchanger is provided to open onto the space to be individually supplied with refrigerant. The tubes of the tube bundle are thus able to be independently supplied with refrigerant from a cell assigned to them.

Such modalities of circulation of the coolant inside the chamber and more specifically inside the cells subdividing it, allows on the one hand to homogenize the coolant between its liquid phase and its gas phase inside of each of the cells and on the other hand to homogenize in the stacking direction of the plates the distribution of the coolant towards each of the tubes of the bundle of tubes which each lead to a cell which is assigned to them.

The performance obtained from the heat exchanger is increased by homogenizing the temperature of its surface, for example, through which an air flow passes. Such performance can be obtained for heat exchangers of differentiated organizations, in particular according to the number of tubes in the tube bundle that they comprise. The number of cells and / or their distribution along the stacking direction of the plates can be easily adapted according to the organization of a given heat exchanger, while moderating the costs of obtaining the manifold.

According to one embodiment, each cell provides a space for circulation of the coolant at least partially around the duct.

More particularly, at least one orifice opens onto each of the cells.

Each of the cells is individually supplied with refrigerant from the distribution device via at least one orifice opening onto the cell. Preferably, a single orifice opens onto at least one cell which is assigned to it.

According to one embodiment, each portion comprises a step, otherwise called a collar.

According to one embodiment, the recesses of at least one pair of plates delimiting a given cell are welded to the recesses of plates adjacent to the plates of the pair of plates. In other words, first recesses of at least one pair of plates delimiting a given cell are welded to second recesses of adjacent plates.

More particularly, two adjacent cells are notably separated from each other by two recesses welded against one another in the stacking direction of the plates. The notches welded to each other are formed on plates one of which delimits a first cell and the other of which delimits a second cell, the first cell and the second cell being adjacent in the stacking direction of the plates .

Preferably, at least one recess comprises at least one wing oriented towards the inside of the chamber transversely to the longitudinal axis of the duct, the openings being delimited by the edges of a wing.

A given cell is more specifically delimited along the stacking direction of the plates between the wings of the recesses of the pair of plates delimiting the cell. Two recesses are advantageously welded to each other at least via a wall.

Preferably, the conduit is welded at least partially along the edges of the openings with which the conduit is at least partially in contact.

According to one embodiment, the recesses of at least one pair of plates delimiting a given cell provide between them an outlet for the cell towards the outside of the chamber.

According to one embodiment, the outlet of at least one given cell and at least one of the orifices of the conduit are opposite one another with respect to the longitudinal axis of the conduit. The path traveled by the refrigerant inside the cell is thus optimized to increase its mixture between its liquid phase and its gaseous phase inside the cell.

The outlet of the cell allows the refrigerant to be discharged from the cell to the outlet of a tube from the bundle of tubes. It is understood that, according to various variants, the outlet of the cell is capable of communicating with the outlet of a tube of the bundle or of forming a window for introducing a tube of the bundle of tubes inside the cell in opening into the interior of the space.

More particularly according to one embodiment, the plates of at least one pair of plates delimiting a given cell each comprise an extension forming between them a tube intended to be supplied with cooling fluid from the cell. The tube is thus incorporated into the manifold. The outlet of a given cell advantageously forms the outlet of a tube. The tube and the manifold are in particular produced by forming recesses and extensions in the same monobloc plate.

The structure of the heat exchanger equipped with the manifold is simplified without affecting the performance obtained from the homogenization of the supply of coolant to each of the tubes in the tube bundle in the stacking direction of the plates.

According to another alternative embodiment, the outlet of a given cell forms a window for introducing into the cell a tube opening into the interior of the cell. The tube is supplied with cooling fluid from inside the cell through its outlet into the space delimited by the cell.

Such a tube extending towards the inside of a cell can advantageously be welded along the edge of the window. The structure of the manifold is simplified by limiting, however, the path traveled by the coolant inside the space for a given volume of a cell, against optimizing the mixture of coolant to inside the cell between its liquid phase and its gas phase.

According to one embodiment, the duct is in contact at least partially against a section of a corrugated sheet. The corrugated sheet is housed in at least one given tube. The corrugated sheet thus forms a member for holding the position of the conduit inside the cell between the edges of the openings of the pair of plates delimiting the cell. The reinforcement of the manifold is reinforced.

Preferably, the duct is advantageously welded at least in part on the edge of the corrugated sheet.

The manifold is thus essentially formed of a robust unitary block comprising a plurality of components welded to each other in multiple welding joints distributed close to each other in the stacking direction of the plates.

The components of such a unit block include in particular at least the plates and the dispensing device comprising at least the conduit, and preferably also the tubes and, alternatively, the corrugated sheets housed inside the tubes.

The welding of the components of the manifold is advantageously carried out by brazing, in particular in an oven. Such brazing is likely to be carried out during an assembly operation of the components of the manifold together, or even during an assembly operation between them of the components of the heat exchanger equipped with a box. collector according to the invention.

According to one embodiment, a single conduit participates in the formation of a plurality of cells.

Preferably, the conduit extends along the entire stack of plates in their stacking direction. Cells can thus be formed between two pairs of plates successively abutted in the stacking direction of the plates.

According to one embodiment, the orifices in their entirety open onto all of the cells.

Generally, a given cell preferably delimits a space at least partially annular, or circular, around the duct.

A partially annular configuration of the space results in particular from the presence of the cell outlet, which is capable of extending transversely to the stacking direction of the plates depending on the configuration of the transverse section of the tubes.

More particularly according to one embodiment and transversely to the stacking direction of the plates or to the longitudinal axis of the duct, the duct and the openings are of circular sections.

According to an embodiment where the duct is of circular section, the recesses are of circular sections transverse to the stacking direction of the plates.

According to a variant where the duct being of circular section, the recesses are of oblong sections transversely to the stacking direction of the plates. A given cell thus delimits a configuration of the at least partially annular space of irregular conformation.

Preferably, the space extends in a semi-annular configuration opposite the outlet of the cells with respect to the longitudinal axis of the conduit. A compromise is thus proposed between a reduction in the transverse size of the manifold with respect to the stacking direction of the plates, and an optimization of the path traveled by the refrigerant inside a given cell providing its mixing. between its liquid phase and its gas phase.

According to one embodiment, the distribution device comprises a pipe, called the second pipe, housed in the pipe, called the first pipe.

According to another embodiment, the second conduit is provided with the inlet mouth for the admission of the refrigerant fluid inside the manifold. More specifically, the inlet mouth allows the admission of the refrigerant fluid inside the distribution device. The second conduit is also provided with a plurality of passages distributed along the second conduit for the evacuation of the refrigerant fluid out of the second conduit towards a volume, or space, delimited by the first conduit.

The passages can be specifically configured and / or be distributed along the second conduit for spraying the refrigerant fluid by providing its mixture between its liquid phase and its gaseous phase.

The orifices can be specifically configured and / or distributed along the duct as a function of the organization of the heat exchanger, in particular with regard to the number and / or the positioning of the tubes of the bundle of tubes which it comprises, to optimize their homogeneous refrigerant supply for each of the tubes.

According to one embodiment, the first conduit surrounds the second conduit at a transverse distance along its longitudinal axis, providing between the first conduit and the second conduit a channel for circulation of the refrigerant fluid discharged from the second conduit. Such a channel makes it possible to promote the mixing of the refrigerant fluid inside the distribution device prior to its evacuation through the orifices towards the chamber of the manifold, and more particularly towards the cells which subdivide it.

The channel can also accommodate at least one mixer formed by a body providing obstacles against a laminar flow of the coolant inside the channel. The mixing inside the coolant distribution device between its liquid phase and its gas phase is thus optimized.

The invention also relates to a heat exchanger equipped with a manifold according to the invention.

More particularly, the stack of plates forms tubes of a bundle that includes the heat exchanger, the tubes opening onto the chamber of the manifold. The tubes are successively arranged in the stacking direction of the plates. At least one tube of the bundle of tubes and at least one cell, onto which the tube opens, are preferably delimited by the same pair of plates.

According to one embodiment, each tube comprises a corrugated sheet.

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The heat exchanger is configured to be used in particular as an evaporator. The heat exchanger can for example be used to cool an air flow passing through it. For example again, the heat exchanger can be used to cool a liquid dedicated to cooling an organ, such as at least one battery of a vehicle supplying the energy necessary at least in part for its propulsion.

The invention also relates to a refrigerant circuit comprising at least one compressor, a condenser, an expansion device and a heat exchanger according to the invention, traversed by a refrigerant.

The invention also relates to a ventilation, heating and / or air conditioning installation, or air conditioning installation, configured to equip a vehicle, in particular a motor vehicle. The air conditioning installation of the invention comprises at least one heat exchanger according to the invention.

The homogenization of the coolant between its liquid phase and its gaseous phase is carried out inside each of the cells to which the orifices open, and the distribution of the coolant to each of the tubes in the tube bundle is obtained homogeneously along of the stacking direction of the plates forming the tubes. The distribution device is firmly held in position inside the chamber of the manifold via the recesses.

The heat exchanger obtained is particularly efficient and presents a moderate cost. The performance obtained from the heat exchanger makes it economically competitive on the vehicle market, in particular on the highly competitive motor vehicle market.

Other characteristics, details and advantages of the invention will emerge more clearly on reading the detailed description given below by way of indication and for example in relation to the drawings of the attached plates, in which:

- Figure 1 is a schematic illustration of a circulation circuit of a refrigerant participating in an air conditioning installation of a vehicle.

- Figure 2 is a schematic illustration of a heat exchanger that includes the circuit shown schematically in Figure 1.

- Figure 3 is a partial illustration in cutaway view of an embodiment of a manifold according to the invention.

- Figure 4 is a partial illustration of a heat exchanger equipped with a manifold according to the embodiment illustrated in Figure 3 ·

- Figure 5 is a partial illustration of a heat exchanger equipped with a manifold according to another embodiment according to the invention.

The figures and their description show the invention in detail and according to specific methods of its implementation. They can of course be used to better define the invention.

In FIG. 1, an air conditioning installation for a vehicle, in particular a motor vehicle, comprises a closed circuit 1 inside which a refrigerant FR circulates. In the illustrated embodiment, the circuit 1 essentially comprises, successively in the direction Si of circulation of the refrigerant fluid FR, a compressor 2, a condenser 3 or gas cooler, an expansion member 4 and at least one heat exchanger 5 ·

The example given of a minimum architecture of circuit 1 is given by way of indication and is not restrictive as to the scope of the invention with regard to various potential architectures of circuit 1.

The heat exchanger 5 is for example dedicated to cooling an air flow FA passing through it, as illustrated in FIG. 2. Such an air flow FA is used in particular to heat treat the air of the passenger compartment of the vehicle or, for example, to cool an organ of the vehicle in operation. For example again, the heat exchanger 5 is dedicated to cooling a liquid used to cool an organ of the vehicle in operation, such as one or more batteries supplying electrical energy to a propulsive electric motorization of the vehicle.

In FIG. 1 and FIG. 2, the heat exchanger 5 comprises a bundle 6 of tubes 12 interposed between a manifold 7 and a return box 8. The manifold 7 extends in a longitudinal direction Dl oriented perpendicular to a direction D3 of extension of the tubes 12 of the bundle 6 of tubes 12 situated between the collecting box 7 and the return box 8. The collecting box 7 delimits a chamber 9 supplied with refrigerant fluid FR through an inlet mouth 10. Fe FR refrigerant circulates inside the heat exchanger 5 to cool at least the tubes 12 of the bundle 6, then is evacuated from the heat exchanger 5 through an outlet mouth 11.

In the example illustrated, the outlet mouth 11 is formed through the manifold 7, which implies that the heat exchanger 5 is a heat exchanger with "U" circulation. Alternatively, the outlet mouth 11 may be formed through the return box 8, which then implies that the heat exchanger 5 is a heat exchanger with circulation in "1".

In FIG. 2, the heat exchanger 5 is of the U-shaped type of the refrigerating fluid FR. In the example illustrated, the heat exchanger 5 is intended for cooling an air flow FA. The tubes 12 of the bundle 6 typically comprise fins 13 promoting the heat exchange between the air flow FA and the tubes 12 of the bundle 6. The air flow FA passes through the bundle 6 of tubes 12 transversely to a general plane Pl , in which the heat exchanger 5> extends, flowing along the tubes 12.

The FR refrigerant circulates from the manifold 7 to a first ply 12a of tubes 12 of the bundle 6 of tubes 12 dedicated to supplying the return box 8 with FR refrigerant. Then the refrigerant FR flows from the return box 8 to the manifold 7 through a second ply 12b of tubes 12 of the bundle 6 of tubes 12. The first ply 12a and the second ply 12b are superimposed according to the direction of circulation of the FA air flow through the heat exchanger 5 ·

Such a configuration of the heat exchanger 5 makes it particularly useful to obtain a homogeneous distribution of the FR refrigerant fluid between its liquid phase and its gas phase and a homogeneous distribution of the FR refrigerant fluid along the manifold 7 towards each of the tubes 12 of the first ply 12a of the bundle 6 of tubes 12.

The example described of the architecture of the thermal exchanger 5 and of the modes of circulation of the refrigerant fluid FR between the manifold box 7 and the return box 8, are given for information and are not restrictive as to the scope of the invention.

In FIG. 1 and FIG. 2, the chamber 9 houses a distribution device 18 extending in a longitudinal direction Ü2 parallel to the longitudinal direction Dl of extension of the manifold 7 · The distribution device 18 comprising a conduit 14 extending along a longitudinal axis A1 between a first end 15 and a second end 16 of the duct 14 · The duct 14 is in particular intended to provide homogenization of the refrigerant fluid FR between its liquid phase and its gaseous phase during its evacuation from the conduit 14 · According to a first embodiment 18a, the distribution device 18 comprises a single conduit 14 · According to a second embodiment 18b, the distribution device 18 comprises the conduit 14, called the first conduit, in which a second conduit 19 is introduced.

The longitudinal axis A1 of the first conduit 14 is oriented parallel to the direction D1 of extension of the manifold 7 and defines the longitudinal direction D2 of extension of the distribution device 18. The distribution device 18 is potentially centered at inside of the manifold 7 as illustrated in FIG. 1 or is eccentric inside the manifold 7 with respect to a median longitudinal axis A2 of extension of the manifold 7 as illustrated in FIG. 2 .

A first longitudinal end 15 of the first conduit 14 comprises the inlet valve 10 for the supply of refrigerant fluid FR to the distribution device 18 via the first conduit 14 · The inlet valve 10 is capable of receiving the refrigerant fluid FR from the outside of the distribution device 18 either directly or via a junction member of the thermal exchanger 5 with the circuit 1 illustrated in FIG. 1. The second end 16 of the first conduit 14 is here closed.

At least one orifice 17 is formed through the first conduit 14 for the evacuation of the refrigerant fluid FR from the first conduit 14 towards the chamber 9 · The first conduit 14 preferably comprises a plurality of orifices 17 formed on at least one part its length to promote the homogenization of the coolant discharged along the first conduit 14 between its liquid phase and its gaseous phase.

With reference also to FIG. 1 and to FIG. 2, the distribution devices according to the first mode 18a or the second mode 18b illustrated in FIGS. 3 to 5, are arranged to be housed in the manifold 7 equipping the disconnector thermal 5, to supply refrigerant fluid FR to the tubes 12 of the bundle 6 as illustrated in FIGS. 4 and 5 ·

The manifold 7 includes the chamber 9 housing the distribution device 18a, 18b which extends in the longitudinal direction Dl of extension of the manifold 7 · The chamber 9 is in communication with a plurality of tubes 12 of the bundle 6 to supply FR with refrigerant from the distribution device 18a, 18b. The distribution device 18a, 18b comprises the inlet valve 10 for its supply of refrigerant fluid LR and a plurality of orifices 17 or passages 20 for the evacuation of the refrigerant fluid LR to the chamber 9 ·

The orifices 17 are distributed along the first conduit 14 · In FIG. 3 and FIG. 4, the inlet mouth 10 is formed at the first longitudinal end 15 of the first conduit 14 · In FIG. 5, the inlet mouth 10 is formed at a longitudinal end of a pipe 19, called the second pipe, housed inside the first pipe 14 · The pipe 19 has a plurality of passages 20 distributed along its length and opening into the first pipe 14 and more specifically towards the orifices 17 as described below.

In the examples illustrated in FIGS. 3 to 5, the chamber 9 is delimited by portions 23 formed at one end of plates 26 extending in the direction D3 of extension of the tubes 12 of the bundle 6. The plates 26, and therefore the portions 23 are stacked in a stacking direction D4 oriented parallel to the longitudinal direction Dl of the manifold 7 · The stacking of the plates 26 in the lower part of the heat exchanger 5 contributes to the formation of the tubes 12 of the beam 6.

The portions 23 each comprise at least one step 25a, 25b, which can also be called a flange. A setback is defined as a surface set back from another surface and parallel to it. Each recess 25a, 25b comprises at least one wall 27 and one wing 28. More precisely, the walls 27 and the wings 28 are located on the longitudinal ends of the recesses 25a, 25b in the stacking direction D4 of the plates 26. The walls 27 are arranged on a transverse axis in the middle zone of the orifices 17 of the first conduit 14 · The wings 28 are arranged all around the first conduit 14 on either side along the longitudinal axis Al of at least one of the orifices 17 of the first duct 14 ·

The orifices 17 are successively separated from each other in the stacking direction D4 of the plates 26 by means of the wings 28 fixed to each other by brazing. The walls 27 of a pair of setbacks 25a, 25b are fixed to each other by brazing so as to form a cell 31 opposite the orifice 17 · In other words, there are as many orifices 17 as cells 31 · Of course, several orifices 17 could be provided per cell 31 ·

The recesses 25a, 25b each comprise an opening 29 authorizing the installation of the distribution device l8a, l8b through these openings 29 and in the direction of the longitudinal axis Al of the first conduit 14 · The distribution device l8a, l8b is then in contact, or even in abutment, on a edge of the wings 28, this edge forming a 3 un edge delimiting an opening 29 ·

The cross section of the first conduit 14 is of complementary shape to the cross section of the openings 29 · The distribution device l8a, l8b closes the openings 29 which it crosses and is welded by brazing along the edges 3θ of the wings 28 delimiting the openings 29 · In the examples illustrated, the cross section of the first conduit 14 and the cross section of the openings 29 are circular, the first conduit 14 and the openings 29 being coaxial along the longitudinal axis Al of the first conduit 14 ·

The chamber 9 is subdivided into a plurality of cells 31 arranged opposite the orifices 17 · The wings 28 of a pair of detachments 25a, 25b forming a given cell 31 are arranged at a distance T1 from one another according to the stacking direction D4 of the plates 26. Each of the cells 31 is thus delimited between the conduit 14 and a pair of plates 26. More specifically, each of the cells 31 is delimited between the conduit 14 and two wings 28 formed by the recesses 25a, 25b.

The orifices 17 open onto the cells 31 which are supplied independently of each other with refrigerant fluid FR from the distribution device 18a, 18b. In the examples illustrated, each orifice 17 leads to a cell 31 which is assigned to it. The cells 31 have an outlet 24 towards the outside of the chamber 9 for the evacuation of the refrigerant fluid FR from the cells 31 to the tubes 12 of the bundle 6. According to the embodiment shown in FIG. 3, the orifices 17 are arranged opposite the outlets 24 of the cells 31 relative to the longitudinal axis Al.

The FR refrigerant is evacuated from the distribution device 18a through the orifices 17 for its admission inside the cells 31 · The FR refrigerant circulates at least in part around the first conduit 14 inside each of the cells 3b then towards their outlet 24 · The refrigerating fluid FR is then evacuated from the cells 31 to supply the tubes 12 of the bundle 6.

In the examples illustrated, the tubes 12 of the bundle 6 are formed by an extension 32 of the plates 26, this extension 32 extending opposite the recesses 25a, 25b. Thus, the tubes 12 of the bundle 6 and the manifold 7 are delimited by the same plate 26 of a pair of plates 26. The tubes 12 are then formed by a space situated between the plates 26 of a pair of plates 26 delimiting cells 31 ·

Each of the plates 26 extends transversely to the stacking direction D4 of the plates 26, for example along the direction D3 of extension of the tubes 12 of the bundle 6. The plates 26 each have at one of their ends the recess 25a , 25b, provided with an opening 29 delimited by the edge 3θ · An extension of each of the plates 26 towards its other end provides an extension 32 forming a wall delimiting the tubes 12 of the bundle 6.

Each of the cells 31 provides a space El for the circulation of the coolant FR around the first conduit 14 · The outlet 24 of the cells 31 is notably configured in accordance with the cross section of the tubes 12 of the bundle 6. For example, if the tubes 12 of the bundle 6 having an oblong cross section, the outlet 24 of the cells will have an oblong conformation.

In the example illustrated in FIG. 3, the tubes 12 of the bundle 6 extend transversely to the longitudinal axis A1 of the first conduit 14, and have a parallelepipedal cross section.

The cells 31 have a semi-circular conformation of the space El around the first conduit 14 · The internal diameter DC of the cells 31 is identical to the external diameter of the first conduit 14 · Thus, each of the cells 31 delimits a space El for circulation of the FR refrigerant partially around the first conduit 14, such circulation preferably extending over an angular range at least equal to 180 ° around the longitudinal axis Al of the first conduit 14 ·

In FIG. 3, the tubes 12 of the bundle 6 each house a corrugated sheet 33 whose corrugations extend in the direction Ü3 of extension of the tubes 12 of the bundle 6. The corrugated sheets 33 extend towards the interior of the cells 31 and can form a seat for the first conduit 14 via their edge 34 located inside the cells 31 · The first conduit 14 is then in contact with at least part of each of the edges 34 of the corrugated sheets 33 on which the first conduit 14 is brazed.

According to the embodiments illustrated in FIG. 3 and FIG. 4, the manifold 7 provides at least two successive spaces El, E2 for circulation of the refrigerant fluid FR from the inlet mouth 10 towards the outlets 24 of the cells 31 · The first space El is located in cells 31 and the second space E2 is located in first conduit 14 ·

According to the exemplary embodiment illustrated in FIG. 5, the manifold 7 provides at least three successive spaces El, E2, E3 for circulation of the refrigerant fluid FR from the inlet mouth 10 towards the outlets 24 of the cells 31 · The first space El is located in cells 3b the second space E2 is located in the first conduit 14 and the third space Εβ is located in the pipe 19, called the second conduit.

Thus, the manifold 7 comprises this plurality of spaces El, E2, Εβ communicating successively between them between the inlet valve 10 and the outlet 24 of the βΐ cells. The different spaces El, E2, Εβ each provide a volume traversed by the refrigerant fluid FR, in order to optimize its mixing inside the manifold 7 between its liquid phase and its gaseous gas before its distribution to each of the tubes 12 of the beam 6.

First spaces El independent of each other are formed by the cells βΐ dividing the interior volume of the chamber 9 in the direction of the longitudinal axis Al of the first conduit 14 · A second space E2 is formed by a recess delimited by a wall interior of the first conduit 14 and by an exterior wall of the second conduit 19 · A third space Εβ is formed by the interior volume of the second conduit 19 ·

The refrigerant FR admitted inside the distribution device 18a, 18b through the inlet nozzle 10 circulates inside the second space E2, then is discharged independently to each of the cells βΐ through the orifices 17 · The FR refrigerant then flows at least in part around the first conduit 14 through the first spaces El towards the outlets 24 for the individual and independent supply of the tubes 12 of the bundle 6 in FR refrigerant from the βΐ cells.

According to the embodiment illustrated in Figure 5, the manifold 7 thus comprises a second conduit 19 housed inside the first conduit 14 extending longitudinally along the longitudinal axis Al of the first conduit 14 · The first conduit 14 surrounds, at a transverse distance, the second conduit 19, the second space E2 being formed between them. According to the example illustrated, the second conduit 19 and the first conduit 14 are coaxial, thus the distance separating them is constant along the longitudinal axis Al of the first conduit 14 · According to a variant, the second conduit 19 and the first conduit 14 can be offset from each other, so the distance between them is variable.

In this second embodiment of the dispensing device, the second conduit 19 is provided with the inlet nozzle 10 through which the refrigerant FR is admitted inside the dispensing device 18b. The third space Εβ is thus formed by the interior recess of the second conduit 19 · The refrigerant fluid FR then enters the second conduit 19, then flows towards the first conduit 14 via passages 20 which pass through the second conduit 19 ·

The second conduit 19 is thus provided with a plurality of passages 20 distributed over its length for the evacuation of the refrigerant fluid FR towards the second space E2 of the first conduit 14. Thus, the refrigerant fluid FR admitted inside the device distribution l8b flows through the third space E3 formed by the interior recess of the second conduit 19 · Then, the refrigerant is evacuated through the passages 20 to the second space E2 formed between the first conduit 14 and the second conduit 19 · Then , the refrigerant FR is evacuated via the orifices 17 towards the first spaces El delimited by the cells 31 ·

Whatever the embodiment envisaged, the manifold 7 according to the invention can thus be obtained at moderate costs, giving it competitiveness in the highly competitive market for vehicles, especially automobiles. The architecture of the manifold 7 provides optimized performance of the heat exchanger 5 and easy adaptability to achieve depending on the configuration and / or the use of a specific heat exchanger 5, especially in the case where the heat exchanger 5 comprises a substantial number of tubes 12.

It is useful to configure the manifold 7 by optimizing the path traveled by the refrigerant FR through it to optimize its mixture between its liquid phase and its gaseous phase. The independent distribution of the FR refrigerant fluid from each of the cells 31 to the tubes 12 of the bundle 6 which are individually assigned to them promotes a supply of homogeneous FR refrigerant fluid to the stack of tubes 12. The performance of the heat exchanger 5 is thus improved.

Claims (16)

1. Collecting box (7) of a refrigerant fluid (FR) for a heat exchanger (5), the collecting box (7) comprising:
- a stack of plates (26), each plate (26) comprising at least one portion (23) in which at least one opening (29) is provided, each opening (29) being delimited by an edge (30), a stack portions (25a, 25b) delimiting a chamber (9) which houses a device (18, 18a, 18b) for distributing the coolant (FR),
- the distribution device (18, 18a, 18b) comprising at least one conduit (14) with a longitudinal axis (Al), the conduit (14) comprising a plurality of orifices (17) distributed along the longitudinal axis (Al ), characterized in that the conduit (14) is in contact at least in part with several edges (30) delimiting the openings (29), the chamber (9) being at least partially compartmentalized in a plurality of cells (31) , each cell (31) being delimited by the conduit (14) and a pair of plates (26).
2. Collector box (7) according to claim 1, in which at least one orifice (17) opens onto each of the cells (31).
3. Collector box (7) according to claim 1 or 2, in which each cell (31) providing a space (El) for circulation of the refrigerant fluid (FR) which extends at least partially around the duct (14) ·
4. Collector box (7) according to any one of the preceding claims, in which each portion (23) comprises a recess (25a, 25b).
5. Collector box (7) according to the preceding claim, in which first recesses (25a, 25b) of at least one pair of plates (26) delimiting a given cell (31) are welded to second recesses (25a, 25b ) of adjacent plates (26).
6. Collector box (7) according to the preceding claim, wherein the first recesses (25a, 25b) of at least one pair of plates (26) are welded to each other at least by means of a wall (27)
7. Collector box (7) according to any one of the preceding claims, in which the duct (14) is welded at least partially along the edges (30) of the openings (29) ·
8. Collector box (7) according to any one of the preceding claims taken in combination with claim 4, in which the recesses (25a, 25b), of at least one pair of plates (26) delimiting a cell (31) given, provide between them an outlet (24) from the cell (31) to the outside of the chamber (9) ·
9. Collector box (7) according to the preceding claim, wherein the outlet (24) of at least one cell (31) given and at least one of the orifices (17) of the conduit (14) are opposite one to the other with respect to the longitudinal axis (Al) of the duct (14) ·
10. Collector box (7) according to any one of the preceding claims, in which a single conduit (14) participates in the formation of a plurality of cells (31).
11. Collector box (7) according to any one of the preceding claims, in which a given cell (31) delimits a space (El) at least partially circular around the duct (14) ·
12. Collector box (7) according to any one of the preceding claims, in which transverse to the longitudinal axis (Al) of the duct (14), the duct (14) and the openings (29) are of circular sections.
13. Collector box (7) according to any one of the preceding claims, in which the duct (14) is provided with an inlet mouth (lo) for the admission of the coolant (FR) inside. the manifold (7).
14. Collector box (7) according to any one of the preceding claims, in which the dispensing device (18, 18a, 18b) comprises a pipe (19), said second conduit (19), housed in the conduit, said first duct (14) ·
15 · Collector box (7) according to the preceding claim, in which the second conduit (19) is provided with an inlet mouth (lo) for the admission of the coolant (FR) inside the collector box (7) and a plurality of passages (2θ) distributed along the second conduit (19) for the evacuation of the coolant (FR) out of the second conduit (19) to the first conduit (14) · 16. Heat exchanger (5) equipped with at least one manifold (7) according to any one of the preceding claims.
17 · circuit (l) of coolant comprising at least one compressor (2), a condenser (3) · an expansion device (4) and a heat exchanger (5) according to claim
5 l6, traversed by a coolant (FR).
1/4
2/4 figure 3 ¢ 0 <0
3/4
D1, D2, D4 <
φ
4/4
D1, D2, D4 figure 5
FR1661748A 2016-11-30 2016-11-30 Device for dispensing a refrigerant fluid inside a collector box of a heat exchanger for an air conditioning installation of a vehicle Pending FR3059398A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR1661748 2016-11-30
FR1661748A FR3059398A1 (en) 2016-11-30 2016-11-30 Device for dispensing a refrigerant fluid inside a collector box of a heat exchanger for an air conditioning installation of a vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1661748A FR3059398A1 (en) 2016-11-30 2016-11-30 Device for dispensing a refrigerant fluid inside a collector box of a heat exchanger for an air conditioning installation of a vehicle

Publications (1)

Publication Number Publication Date
FR3059398A1 true FR3059398A1 (en) 2018-06-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
FR1661748A Pending FR3059398A1 (en) 2016-11-30 2016-11-30 Device for dispensing a refrigerant fluid inside a collector box of a heat exchanger for an air conditioning installation of a vehicle

Country Status (1)

Country Link
FR (1) FR3059398A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2250336A (en) * 1990-10-17 1992-06-03 Nippon Denso Co Heat exchanger
JPH04309766A (en) * 1991-04-05 1992-11-02 Nippondenso Co Ltd Heat exchanger
WO1994014021A1 (en) * 1992-12-07 1994-06-23 Multistack International Limited Improvements in plate heat-exchangers
JP2002122393A (en) * 2000-08-09 2002-04-26 Denso Corp Stacked heat exchanger
DE202008004582U1 (en) * 2007-04-16 2008-06-19 Viessmann Werke Gmbh & Co Kg Plate heat exchanger
EP3002539A1 (en) * 2014-09-30 2016-04-06 Valeo Climate Control Corp Heater core

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2250336A (en) * 1990-10-17 1992-06-03 Nippon Denso Co Heat exchanger
JPH04309766A (en) * 1991-04-05 1992-11-02 Nippondenso Co Ltd Heat exchanger
WO1994014021A1 (en) * 1992-12-07 1994-06-23 Multistack International Limited Improvements in plate heat-exchangers
JP2002122393A (en) * 2000-08-09 2002-04-26 Denso Corp Stacked heat exchanger
DE202008004582U1 (en) * 2007-04-16 2008-06-19 Viessmann Werke Gmbh & Co Kg Plate heat exchanger
EP3002539A1 (en) * 2014-09-30 2016-04-06 Valeo Climate Control Corp Heater core

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