EP4396515A1

EP4396515A1 - Heat exchanger for refrigerant loop

Info

Publication number: EP4396515A1
Application number: EP22768788.6A
Authority: EP
Inventors: Gael Durbecq; Kamel Azzouz; Jeremy Blandin; Julio GUERRA
Original assignee: Valeo Systemes Thermiques SAS
Current assignee: Valeo Systemes Thermiques SAS
Priority date: 2021-09-03
Filing date: 2022-08-23
Publication date: 2024-07-10
Also published as: FR3126765B1; FR3126765A1; CN117957416A; WO2023030977A1

Abstract

The invention relates to a heat exchanger (1) comprising a refrigerant manifold (3) split into a first collection chamber (30) and a second collection chamber (31), each chamber having a fluid inlet portion (300, 310) and a fluid outlet portion (301, 311). According to the invention, a connection device (68) has a refrigerant inlet duct (6) split into a first inlet channel (60) connected to the inlet portion (300) of the first collection chamber (30) and a second inlet channel (61) connected to the inlet portion (310) of the second collection chamber (31), and a refrigerant outlet duct (7) forming the junction between a first outlet channel (70) connected to the outlet portion (301) of the first collection chamber (30) and a second outlet channel (71) connected to the outlet portion (311) of the second collection chamber (31).

Description

Heat exchanger for refrigerant loop

The present invention relates to the field of refrigerant fluid loops for motor vehicles, and more particularly for electric or hybrid vehicles.

An electric or hybrid car comprises a heating, ventilation and/or air conditioning installation for a motor vehicle and a refrigerant fluid loop configured to vary the temperature inside its passenger compartment, and in particular to heat it in winter and to cool it down in summer. The temperature of the passenger compartment is modified in particular by means of the refrigerant fluid circulating in the refrigerant fluid loop between a heat exchange device arranged in the vehicle in the vicinity of the passenger compartment, and a heat exchanger located in contact with the ambient air, in front of the vehicle. Thus, the coolant circulating in the coolant loop absorbs or releases calories at the heat exchanger or the heat exchange device depending on the heating or cooling needs of the passenger compartment. The use of a compressor and, where appropriate, of an expansion valve is in particular necessary to modify the pressure of the refrigerant fluid in the refrigerant fluid loop in order to thermodynamically modify the temperature of the refrigerant fluid subsequently caused to pass through the device. heat exchanger and heat exchanger.

The heat exchanger located on the front of the vehicle enables the exchange of calories between the coolant which circulates in tubes arranged one above the other and spaced from one another by spacers, and an air flow, coming from from outside the vehicle and passing through said heat exchanger between the tubes at the spacers.

In electric or hybrid vehicles, it is known to configure the refrigerant loop and the heat exchanger on the front face to form a reversible heat pump in which the heat exchanger is able to operate in condenser mode, in summer, to ensure the cooling of the passenger compartment via the heat exchange device forming an evaporator in the heating, ventilation and/or air conditioning installation, and to operate in evaporator mode, in winter, to ensure heating in the passenger compartment via the heat exchange device forming a condenser. A problem with such a heat exchanger placed on the front of the vehicle then lies in its operation as an evaporator, when the temperature differential tends to heat the flow of humid air and create droplets of condensation which are deposited on the surface of the heat exchanger. 'heat exchanger. If the temperature of the refrigerant circulating in the tubes is too low, and the spacers between the tubes are too cold by thermal conduction, the cooling of the condensation droplets may form frost locally on the spacers between the heat exchanger tubes. heat. Such a presence of frost generates obstacles to the passage of air through the heat exchanger and therefore tends to reduce the thermal capacities of the heat exchanger.

The present invention aims to remedy this drawback, by proposing a refrigerant loop, and more particularly a heat exchanger, making it possible to limit the formation of frost on the latter. The invention therefore makes it possible to increase the thermal capacities of the heat exchanger and therefore of the refrigerant fluid loop.

The main object of the present invention is thus a heat exchanger for a refrigerant fluid loop comprising a heat exchange surface, a first refrigerant fluid collector and a second refrigerant fluid collector arranged respectively at a first longitudinal end of the surface of the refrigerant. heat exchanger and at a second longitudinal end of the heat exchange surface, characterized in that at least one of the refrigerant fluid collectors is split into a first collector chamber and a second collector chamber separated by a dividing wall , each of these collecting chambers, respectively comprising a fluid inlet portion, and a fluid outlet portion, and in that a connection device associated with the at least one refrigerant fluid collector comprises a refrigerant inlet split into a first fluid inlet channel connected to the fluid inlet portion of the first ch collecting amber and in a second fluid inlet channel connected to the fluid inlet portion of the second collecting chamber, and a coolant fluid outlet conduit making the junction between a first fluid outlet channel connected to the portion fluid outlet of the first collection chamber and a second fluid outlet channel connected to the fluid outlet portion of the second collection chamber.

The refrigerant fluid loop can be arranged within a vehicle, for example hybrid or electric, in order to cool or heat the passenger compartment of this vehicle. The heat exchanger can be an evapo-condenser in which the fluid circulates refrigerant. This heat exchanger comprises the heat exchange surface within which heat exchanges take place between a flow of air, intended to pass through said exchange surface, and the refrigerant fluid circulating within the tubes of this exchange surface, the coolant capturing or transferring calories to the air flow depending on the configuration of the coolant loop, intended to cool or heat the passenger compartment of the vehicle.

The partition wall extends across a manifold to delimit two manifold chambers within the same refrigerant manifold, such that the first manifold chamber and the second manifold chamber are fluidically separated. The coolant caused to circulate in one of the collecting chambers can circulate only in the tubes associated with this collecting chamber.

Within the at least one coolant manifold, the first manifold chamber and the second manifold chamber each comprise both a fluid inlet portion and a fluid outlet portion. These fluid inlet portions and these fluid outlet portions are therefore grouped together within the same refrigerant fluid manifold. Thus, the fluid inlets and outlets can be located on a single refrigerant fluid manifold. Such an arrangement makes it possible to avoid having the fluid inlet portions on a first manifold at one longitudinal end of the heat exchange surface, and the fluid outlet portions on a second manifold at the other end longitudinal of this heat exchange surface. The connections and connections necessary for supplying the heat exchange surface are therefore facilitated, since the inlet and outlet portions are arranged at the same longitudinal end of the heat exchange surface.

The heat exchanger thus advantageously has a single connection device, this connection device being equipped with two fluid inlet channels and two fluid outlet channels. Each of these channels is connected to one of the fluid inlet or outlet portions of the collecting chambers of the at least one refrigerant fluid collector.

According to one characteristic of the invention, the connection device comprises a connection flange fixed to the at least one refrigerant fluid manifold and in which the two fluid inlet channels and the two fluid outlet channels are formed. According to one characteristic of the invention, the fluid inlet and fluid outlet channels are connected to one of the collecting chambers by means of tubular elements capable of connecting the body of the connection flange to the at least one coolant manifold.

These tubular elements in particular allow the body of the connecting flange to be arranged on the at least one refrigerant fluid manifold at a distance from the fluid inlet or outlet portion which receives the fluid inlet or outlet channel corresponding fluid. Conversely, if the body of the connection flange is arranged directly opposite the corresponding fluid inlet or outlet portions, the fluid inlet or outlet channels are connected directly to the corresponding fluid manifold, without tubular elements.

According to a characteristic of the invention, the tubular elements are arranged in the extension of a main elongation plane of the heat exchange surface.

This particular arrangement of the tubular elements makes it possible to limit the size of the heat exchanger within the vehicle that it is intended to equip.

According to a characteristic of the invention, the two inlet channels formed in the connection flange extend perpendicular to each other, and/or in which the two outlet channels formed in the connection flange extend extend perpendicular to each other.

According to one characteristic of the invention, the heat exchange surface comprises tubes configured to channel the coolant, these tubes extending longitudinally between the first coolant manifold and the second coolant manifold, the tubes being distributed into two sets of tubes, the tubes of a first set opening into the first collecting chamber of the at least one coolant manifold and the tubes of a second set opening into the second collecting chamber of the at least one manifold of refrigerant fluid.

In this way, the tubes allow the circulation of the refrigerant fluid within the heat exchange surface, and convey the fluid either to the first collecting chamber or from it, or to the second chamber. manifold or from it. According to a characteristic of the invention, the tubes are stacked in a stacking direction according to an alternation between the tubes of the first set and the tubes of the second set.

It is understood that the tubes are stacked so that the heat exchange surface comprises an alternation between a tube from the first set and a tube from the second set. This alternation thus forms a layout pattern, which is repeated from one end to the other of the heat exchange surface in a stacking direction of the tubes which is perpendicular to their direction of elongation.

According to one characteristic of the invention, the first collecting chamber and the second collecting chamber of the at least one refrigerant fluid collector are aligned in a longitudinal direction, the first collecting chamber being located between the heat exchange surface and the second collection chamber, the tubes of the first set having a longitudinal dimension less than a longitudinal dimension of the tubes of the second set, these longitudinal dimensions being measured between a median plane extending perpendicular to the heat exchange surface and the at least a coolant manifold.

It is thus understood that the first collecting chamber is interposed, in a longitudinal direction, between the heat exchange surface and the second collecting chamber.

The median plane, extending equidistant from the first collector and the second collector, separates the heat exchanger into two symmetrical or at least substantially equivalent parts, it being understood that supply and evacuation ducts can be connected in different zones on one collector with respect to the other without this preventing the plane perpendicular to the heat exchange surface and equidistant from the collectors from being considered as a median plane within the meaning of the invention.

It can also be considered the extension length of a tube, which is distinguished from its longitudinal dimension. The extension length is measured from a first longitudinal end of the tube to its second longitudinal end, i.e. from the first refrigerant manifold to the second refrigerant manifold, and the longitudinal dimension is measured between the median plane and the first refrigerant manifold. refrigerant fluid. According to an optional characteristic of the invention, the second refrigerant fluid collector is split into two collecting chambers, the tubes of the first set opening into a first collecting chamber and the tubes of the second set opening into a second collecting chamber, the tubes of the first together and the tubes of the second set being of different extension lengths.

In other words, in a first embodiment where the tubes have different extension lengths from one set of tubes to another, the extension length of the tubes of the first set is such that these tubes extend, at one of their longitudinal ends, to the first collecting chamber of the first collector and at the other of their longitudinal ends to the first collecting chamber of the second collector. Conversely, the tubes of the second set have an extension length such that these tubes extend, at one of their longitudinal ends, as far as the second collecting chamber of the first collector and at the other of their longitudinal ends to the second collecting chamber of the second collector.

According to another optional characteristic of the invention, the second refrigerant fluid collector is split into two collecting chambers, the tubes of the first set opening into a second collecting chamber and the tubes of the second set opening into a first collecting chamber, the tubes of the first set and the tubes of the second set being of the same extension length.

In other words, in a second embodiment where the tubes all have equal extension lengths from one set of tubes to another, the tubes of the first set open into the first collecting chamber of the first collector and into the second collector chamber of the second collector, while the tubes of the second set open into the second collector chamber of the first collector and into the first collector chamber of the second collector.

According to another characteristic of the invention, the heat exchanger comprises at least a first refrigerant circuit consisting of the first fluid inlet channel of the connection device, of the fluid inlet portion of the first collecting chamber of the first coolant manifold fluidically connected to the tubes of the first set, of the tubes of the first set, of the first collecting chamber of the second manifold fluidically connected to the tubes of the first set, of the fluid outlet portion of the first collecting chamber of the first refrigerant manifold fluidly connected to the tubes of the first set and the first fluid outlet channel, the first fluid inlet channel being configured to be fluidly connected to a first portion of the refrigerant loop and the first outlet channel of fluid being configured to be fluidically connected to a second portion of the refrigerant fluid loop, the heat exchanger comprising at least a second circuit of refrigerant fluid consisting of the second fluid inlet channel of the connection device, of the portion fluid inlet of the second collecting chamber of the first coolant manifold fluidically connected to the tubes of the second set, of the tubes of the second set, of the second collecting chamber of the second coolant manifold fluidically connected to the tubes of the second set, of the fluid outlet portion of the second collecting chamber of the first co the fluid drive fluidly connected to the tubes of the second set and the second fluid outlet channel, the second fluid inlet channel being configured to be fluidly connected to the first portion of the refrigerant loop and the second outlet channel of fluid being configured to be fluidically connected to the second portion of the refrigerant fluid loop, the tubes of the first set and the tubes of the second set being fluidically distinct from each other.

It is understood that the refrigerant circuits as they have just been described correspond to a heat exchanger according to the first embodiment, for which the tubes of the first set and the tubes of the second set have different extension lengths . The circulation of the refrigerant fluid in the first circuit and the circulation of the refrigerant fluid in the second circuit being in opposite directions, they allow a better distribution of the temperature gradient of the refrigerant fluid in the heat exchange surface. The temperature of the heat exchange surface is thus more homogeneous, so that the formation of frost on the exchange surface of the heat exchanger is limited.

According to an alternative characteristic, the heat exchanger comprises at least a first refrigerant fluid circuit consisting of the first fluid inlet channel of the connection device, of the fluid inlet portion of the first collecting chamber of the first refrigerant fluid fluidly connected to the tubes of the first set, of the tubes of the first set, of the second collecting chamber of the second manifold fluidically connected to the tubes of the first together, the fluid outlet portion of the first collecting chamber of the first coolant manifold fluidly connected to the tubes of the first set and the first fluid outlet channel, the first fluid inlet channel being configured to be fluidly connected to a first portion of the coolant loop and the first fluid outlet channel being configured to be fluidically connected to a second portion of the coolant loop, the heat exchanger comprising at least a second coolant circuit consisting of the second fluid inlet channel of the connection device, of the fluid inlet portion of the second collecting chamber of the first refrigerant fluid collector fluidically connected to the tubes of the second set, of the tubes of the second set, of the first chamber manifold of the second refrigerant fluid manifold fluidly connected to the tubes of the second in seems, from the fluid outlet portion of the second collection chamber of the first fluid manifold fluidly connected to the tubes of the second set and from the second fluid outlet channel, the second fluid inlet channel being configured to be fluidly connected to the first portion of the coolant loop and the second fluid outlet channel being configured to be fluidically connected to the second portion of the coolant loop, the tubes of the first set and the tubes of the second set being fluidly distinct from each other others.

It is understood that the refrigerant circuits as they have just been described correspond to a heat exchanger according to the second embodiment, for which the tubes of the first set and the tubes of the second set have the same extension length .

According to a feature of the invention, the fluid outlet portion of the first collecting chamber and the fluid inlet portion of the second collecting chamber are separated from the fluid outlet portion of the second collecting chamber and from the fluid inlet of the first collecting chamber through a watertight bulkhead.

This separation by means of the watertight bulkhead makes it possible to individualize two distinct fluid circuits within the same manifold. A first of these circuits, for example the refrigerant circuit having an inlet portion in the second collecting chamber and an outlet portion in the first collecting chamber, is thus separate from a second refrigerant circuit, for example the circuit having an input portion in the first collecting chamber and a portion of outlet in the second collecting chamber. Each circuit thus has its own fluid inlet and outlet portions, the sealed partition allowing these two circuits to coexist in the same manifold. In this way, all the fluid inlet and outlet portions are grouped together at the same longitudinal end of the heat exchange surface.

Other characteristics, details and advantages of the invention will emerge more clearly on reading the description which follows on the one hand, and exemplary embodiments given by way of indication and not limitation with reference to the appended drawings on the other hand. , on which ones :

[Fig. 1] schematically illustrates a cross-sectional view of the heat exchanger according to the invention, showing in particular a heat exchange surface and two coolant manifolds arranged on either side of this exchange surface heat, as well as a connection device arranged on one of the collectors;

[Fig. 2] schematically illustrates, in a cross-sectional view, tubes configured to channel the coolant fluid and participating in forming the heat exchange surface and part of one of the coolant fluid collectors, making visible in particular the characteristic according to which tubes from a first set open into a first collecting chamber and tubes from a second set open into a second collecting chamber;

[Fig. 3] illustrates, schematically, a perspective view of the connection device of the heat exchanger of FIG. 1, the collector on which the connection device is intended to be fixed being partially represented;

[Fig. 4] illustrates, schematically, a cross-sectional view of the connection device of FIG. 3 and of the portion of the refrigerant fluid manifold on which the connection device is fixed;

[Fig. 5] schematically illustrates a refrigerant loop including the heat exchanger of Figure 1.

The characteristics, variants and different embodiments of the invention may be associated with each other, in various combinations, insofar as they are not incompatible or exclusive with respect to each other. In particular, variants of the invention may be imagined comprising only a selection of characteristics described below in isolation from the other characteristics described, if this selection of characteristics is sufficient to confer a technical advantage and/or to differentiate the invention. compared to the prior art.

In the figures, the elements common to several figures retain the same reference.

In the detailed description which follows, the denominations “longitudinal”, “transverse” and “vertical” refer to the orientation of the heat exchanger according to the invention. A longitudinal direction corresponds to a main direction of elongation of the tubes configured to channel the refrigerant fluid, this longitudinal direction being parallel to a longitudinal axis L of a reference L, V, T illustrated in the figures. A vertical direction corresponds to a stacking direction of these tubes, this vertical direction being parallel to a vertical axis V of the reference L, V, T and this vertical axis being perpendicular to the longitudinal axis L. Finally, a transverse direction corresponds in a direction parallel to a transverse axis T of the reference L, V, T, this transverse axis T being perpendicular to the longitudinal axis L and to the vertical axis V.

In addition, in the present description the term "refrigerant fluid" can refer to any fluid or heat transfer liquid, cooling, dielectric or diphasic, since this fluid or liquid has the effect of cooling or heating the air flow. passing through the exchange surface of a heat exchanger.

FIG. 1 schematically illustrates a heat exchanger 1 according to the invention suitable for equipping a refrigerant fluid loop of a vehicle, represented schematically in FIG. 5, this heat exchanger 1 being represented here in section according to a plane of longitudinal and vertical section.

The heat exchanger 1 comprises a heat exchange surface 2, which is intended to be traversed by a flow of air 100 flowing substantially perpendicular to the plane of elongation in which the heat exchange surface mainly fits heat.

The heat exchanger 1 also comprises a first coolant manifold 3, disposed at a first longitudinal end 21 of the heat exchange surface 2, and a second coolant fluid manifold 4, disposed at a second longitudinal end 22 of the heat exchange surface 2. It is thus understood that the heat exchange surface 2 is delimited longitudinally by the first refrigerant fluid collector 3 on the one hand, and by the second refrigerant fluid collector 4 on the other hand.

The first coolant manifold 3 and the second coolant manifold 4 have at their respective vertical ends partitions, not shown in this figure. These partitions make it possible to seal the refrigerant fluid manifolds 3 and 4.

The heat exchange surface 2 comprises tubes 5 which are configured to channel the refrigerant fluid from one collector to another. These tubes 5 thus extend longitudinally between the first coolant manifold 3 and the second coolant fluid manifold 4, being stacked in a stacking direction E, which corresponds to a vertical direction of the heat exchanger 1.

The tubes 5 are divided into two sets of tubes, forming a first set 5A and a second set 5B, each set of tubes being fluidically distinct from the other set of tubes. In other words, the refrigerant circulating from the inlet to the outlet of the heat exchanger within the tubes of the first set of tubes cannot circulate within the tubes of the second set of tubes.

According to a first embodiment, in which the tubes of the first set 5A have lower extension lengths than the tubes of the second set 5B, these tubes of the first set 5A open out at a first of their longitudinal ends into the first collecting chamber 30 of the first coolant manifold 3, and at a second of their longitudinal ends in the first collecting chamber 40 of the second coolant manifold 4. The tubes of the second set 5B open out at a first of their longitudinal ends in the second collecting chamber 31 of the first coolant manifold 3, and at a second of their longitudinal ends in the second collecting chamber 41 of the second fluid manifold 4.

According to a second embodiment, in which the tubes 5 all have the same extension length, the tubes of the first set 5A open at a first of their longitudinal ends into the first collecting chamber 30 of the first refrigerant fluid collector 3, and at a second of their longitudinal ends in the second collecting chamber 41 of the second coolant manifold 4. The tubes of the second set 5B open at a first of their longitudinal ends into the second collecting chamber 31 of the first coolant manifold 3, and at a second of their longitudinal ends in the first collector chamber 40 of the second fluid collector 4.

By opening out is meant that the tubes of the first set 5A have, at their two longitudinal ends, free ends capable of letting the refrigerant fluid pass, these free ends being arranged respectively in the first collecting chamber 30 of the first refrigerant fluid collector 3 and in the first collecting chamber 40 or the second collecting chamber 41 of the second refrigerant fluid collector 4, according to the embodiment. In the same way, the tubes of the second set 5B have, at their two longitudinal ends, free ends arranged respectively in the second collecting chamber 31 of the first refrigerant fluid collector 3, and in the first collecting chamber 40 or second collecting chamber 41 of the second coolant manifold 4 according to the embodiment.

According to the invention, at least one refrigerant fluid collector is split into two collecting chambers. In this embodiment, it will be considered that this at least one refrigerant fluid manifold corresponds to the first refrigerant fluid manifold 3. This at least one refrigerant fluid manifold can however be disposed, indifferently, at a first longitudinal end 21 of the heat exchange surface 2 or at a second longitudinal end 22 of the heat exchange surface 2.

Without departing from the context of the invention, provision may be made for the two collectors to have such a partition into two collecting chambers, and it may in particular be provided for the two collectors to have equivalent configurations, mirroring one with respect to the other. 'other on either side of the heat exchange surface.

In the example illustrated, the first refrigerant fluid collector 3 is split into two collecting chambers 30 and 31, namely a first collecting chamber 30 and a second collecting chamber 31, and the second cooling fluid collector 4 is also split into two collecting chambers 40 and 41, namely a first collecting chamber 40, and a second collecting chamber 41. In the vicinity of the first longitudinal end 21 of the heat exchange surface 2, the first collecting chamber 30 and the second collecting chamber 31 of the first refrigerant fluid collector 3 are aligned in a longitudinal direction, with the first collecting chamber 30 which is located between the heat exchange surface 2 and the second collecting chamber 31. Similarly, in the vicinity of the second longitudinal end 22 of the heat exchange surface 2, the first collecting chamber 40 and the second collecting chamber 41 of the second refrigerant fluid collector 4 are aligned in a longitudinal direction, with the first collecting chamber 40 which is located between the heat exchange surface 2 and the second collecting chamber 41.

The first collector chamber 30 of the first refrigerant fluid collector 3 comprises a fluid inlet portion 300 and a fluid outlet portion 301. Each of these portions of the first collector chamber is equipped with a fluidic connection endpiece, which allows the connection to the refrigerant fluid loop to allow the supply and evacuation of this refrigerant fluid. A first inlet end piece and a first outlet end piece, forming connection means 83, as will be described in more detail below, are thus arranged in the first manifold so as to open into the first collecting chamber. and to have a free end opening out of the heat exchanger. As can be seen in FIG. 1, these end pieces are for this purpose arranged so as to pass through the second collecting chamber.

The second collecting chamber 31 of the first refrigerant fluid collector 3 comprises a fluid inlet portion 310 and a fluid outlet portion 311, which can also be connected to a fitting to facilitate connection to the refrigerant fluid loop, or well be only equipped with an orifice allowing fluid communication between the second collecting chamber and the refrigerant loop.

The fluid inlet portion 300 and the fluid inlet portion 310 correspond to the portions through which the refrigerant enters the heat exchanger 1, while the fluid outlet portion 301 and the fluid outlet portion 311 correspond to the portions through which the refrigerant is evacuated from the heat exchanger 1. In other words, the fluid enters the heat exchanger through two separate inlet portions, the portion of fluid penetrating through the portion fluid inlet associated with the first collecting chamber, respectively the second collecting chamber, being intended to circulate in the heat exchange surface, and in particular through the first set of tubes, respectively the second set of tubes, as will be described below afterwards, to return in the direction of the fluid outlet portion associated with this first collecting chamber, respectively this second collecting chamber, and exit the heat exchanger.

As seen in Figure 1, the fluid inlet portions 300 and 310 and the fluid outlet portions 301 and 311 respectively associated with one or the other of the collecting chambers of the first refrigerant fluid collector 3 are advantageously arranged in the vicinity of the same longitudinal end 21 of the heat exchange surface 2.

According to the invention, the heat exchanger 1 has a connection device 68 associated with the first refrigerant fluid collector 3. This connection device 68 comprises a refrigerant fluid inlet conduit 6 and a refrigerant fluid outlet conduit 7 The coolant fluid inlet duct 6 is split into a first fluid inlet channel 60 and a second fluid inlet channel 61, while the fluid outlet duct 7 forms the junction between a first fluid inlet channel fluid outlet 70 and a second fluid outlet channel 71.

More particularly, and as will be described in more detail with reference to Figure 3, this connection device 68 comprises a connection flange 8 secured to the first refrigerant fluid manifold and consisting here of a substantially rectangular housing within which are made of hollow tubular portions to form the various channels.

The first fluid inlet channel 60 is connected to the fluid inlet portion 300 of the first collection chamber 30, and the second fluid inlet channel 61 is connected to the fluid inlet portion 310 of the second collecting chamber 31. The first fluid outlet channel 70 is connected to the fluid outlet portion 301 of the first collecting chamber 30, and the second fluid outlet channel 71 is connected to the fluid outlet portion 311 of the second collecting chamber 31. As shown here, the first fluid inlet channel 60 and the second fluid outlet channel 71 are connected to their corresponding collecting chamber portion via a tubular element 82 . Figure 2 is a sectional view of part of the tubes 5 configured to channel the refrigerant fluid and of the first refrigerant fluid manifold 3.

According to the first embodiment shown here, the tubes of the first set 5A have a main extension length of a value less than that of the main extension length of the tubes of the second set 5B. These main extension lengths correspond to the dimension of the tubes 5 between their first longitudinal ends and their second longitudinal ends. It is thus understood that each of the tubes of the first set 5A is shorter than each of the tubes of the second set 5B, and conversely each of the tubes of the second set 5B is longer than each of the tubes of the first set 5A. Conversely, according to the second embodiment, visible in Figure 6, the tubes of the first set 5A and the second set 5B have the same main extension length. The heat exchanger 1 according to the first embodiment is described here, but it is understood that the characteristics of this heat exchanger 1 are applicable mutatis mutandis to the second embodiment.

The tubes 5 are stacked in the stacking direction E alternately between the tubes of the first set 5A and the tubes of the second set 5B. This alternation results in the repetition of an arrangement pattern composed of a tube from the first set 5A and a tube from the first set 5B, this arrangement pattern being repeated in the stacking direction E. In the example illustrated, the alternation between tube of the first set 5A and tube of the second set 5B extends from one vertical end to the other of the exchange surface 2.

The first coolant manifold 3 has at a first of its longitudinal ends an outer wall 33, located at a distance from the heat exchange surface 2, and at a second of its longitudinal ends a sealing wall 34. These walls 33 and 34 extend in a substantially vertical direction, that is to say in the stacking direction E of the tubes 5. The sealing wall 34 forms a contact surface between the heat exchange surface and the first collector, and it comprises slots 340 arranged in parallel one above the other along the vertical direction, and each sized to pass either a tube from the first set 5A or a tube from the second set 5B.

The first collecting chamber 30 and the second collecting chamber 31 are separated by a dividing wall 32. This dividing wall 32 has a first face and a second face, the first face being facing the first collecting chamber 30 while the second face is facing the second collecting chamber 31. The separating wall 32 has windows 320 able to let the tubes of the second set pass 5B, so that these tubes open into the second collecting chamber 30.

In this arrangement, the heat exchange surface 2, the sealing wall 34, the first collecting chamber 30, the separating wall 32 and the second collecting chamber 31 are aligned along a longitudinal direction, which corresponds to the direction of tube extension 5.

More particularly, the sealing wall 34 comprises first slots which are configured to receive the tubes of the first set 5A, which thus pass through the sealing wall to open into the first collecting chamber 30. The sealing wall 34 also comprises second slots, configured to receive the tubes of the second set 5B. These tubes of the second set 5B, longer than the tubes of the first set 5A, also pass through the separation wall 32, which has windows 320 capable of receiving them. The tubes of the second set 5B can therefore pass through the first sealing wall 34, the first collecting chamber 30 and the separating wall 32, to reach the second collecting chamber 31 into which they open. It is understood that to allow the passage of the tubes of the second set 5B through the partition wall 32 and the sealing wall 34, the windows 320 of the separating wall 32 are opposite the second slots of the sealing wall 34 .

The windows 320 and the slots 340 are formed at regular intervals, respectively, in the partition wall 32 and the sealing wall 34. Such openings in the partition walls 32 and sealing 34 form cylinders for receiving the tubes. 5. In the example shown, these receiving cylinders all have a similar shape, the outer profile of the tubes being the same whether they form part of the first set of tubes or of the second set of tubes. Additionally, provision may be made for the outer profile of the tubes of the first set to be different from the outer profile of the tubes of the second set, and for the slots and the windows to have, in order to cooperate with their respective tubes, profiles which may vary. In this way, foolproofing means are formed which make it possible to ensure that a tube from the first set is not mounted in place of a tube from the second set.

The first coolant manifold 3 further comprises a sealed partition 9, which extends on either side of the separation wall 32, from the outer wall 33 of the first coolant manifold 3 to the wall of sealing 34 of this first refrigerant fluid collector 3. This sealed partition 9 is parallel to the longitudinal direction of the heat exchanger 1 and perpendicular to the partition wall 32, to the outer wall 33 and to the sealing wall 34.

This sealed partition 9 operates a separation between on the one hand an assembly formed by the fluid outlet portion 301 of the first collecting chamber 30 and the fluid inlet portion 310 of the second collecting chamber 31, and on the other starts from an assembly formed by the fluid outlet portion 311 of the second collecting chamber 31 and the fluid inlet portion 300 of the first collecting chamber 30. The sealed partition 9 has a first face 91 and a second face 92, which make it possible to distinguish the tubes of the first set 5A which are arranged opposite this first face 91 and the tubes of the first set 5A which are arranged opposite this second face 92. Similarly, the watertight partition 9 separates the tubes of the second set 5B which are arranged opposite the first face 91 and the tubes of the second set 5B which are arranged opposite the second face 92.

FIG. 3 is a perspective view of the connection device 68 of the heat exchanger 1, which makes the connection flange 8 mentioned above with reference to FIG. 1 more particularly visible. The body 80 of the connection flange 8 is a substantially rectangular box, one longitudinal end face 85 of which is pressed against the first coolant manifold 3.

In the example illustrated, the housing forming a flange body has a connection face 84 on a transverse end face. This connection face 84 is pierced with two connection orifices 63, 73 to which the inlet fluid 6 and the fluid outlet conduit 7.

The body 80 of the connection flange 8 also has, on a first vertical end face, perpendicular to the connection face 84, a connection face 86 to which the tubular elements 82 which will be described below are connected. after and which allow the connection between the flange body and the collecting chambers of the first manifold arranged at a distance from the flange body.

Alternatively, without departing from the context of the invention, provision may be made for the connection orifices of the fluid inlet and outlet ducts to be arranged on a face other than the illustrated transverse end face, or else that they are distributed over two distinct faces and in particular over the two opposite transverse end faces of the casing, and provision may be made for the tubular elements 82 to be connected on a face other than the first vertical end face. It is however notable that the face of the housing of the flange body on which the tubular elements are attached is substantially perpendicular to the connection face.

The longitudinal end face 85 pressed against the collector, and more particularly against the outer wall 33 of the first collector 3, has a concave shape, which is complementary to a convex shape of the outer wall 33 of the first collector 3. This complementarity of the complementary face 85 and of the outer wall 33 allows easy assembly of these two elements, and ensures their relative maintenance.

According to the invention, the flange fixed to the first manifold and forming part of the connection device 68 is such that various channels are formed within it, so that the fluid inlet duct 6, communicating with a connection orifice inlet 63 formed in the connection face 84, is split into two fluid inlet channels extending distinctly into the flange from this inlet connection orifice 63 and among which the first inlet channel of fluid 60 and the second fluid inlet channel 61. And similarly, two fluid outlet channels extend distinctly within the housing until they meet at the outlet connection orifice 73 associated with the fluid outlet conduit 7, so that this fluid outlet conduit ensures the junction between the first fluid outlet channel 70 and the second fluid outlet channel 71.

The fluid inlet channels 60, 61 arranged in the body 80 of the connecting flange 8 extend perpendicular to one another from the inlet connection port 63. Similarly, the fluid outlet channels 70, 71 arranged in the body 80 of the connection flange 8 extend perpendicularly with respect to each other from the outlet connection orifice 73. As a result, the channels of entry lead to faces of the housing forming the flange body 80 which are distinct and perpendicular to each other, and that analogously the outlet channels open onto faces of the casing forming the flange body which are separate and perpendicular with respect to one another.

The inlet and outlet connection orifices 63, 73, to which the inlet and outlet ducts 6, 7 are connected, as well as the inlet channels and the outlet channels, can in particular be made in the thickness of the casing forming the connection flange by a machining operation, for example by performing a drilling or a bore. Alternatively, the housing and the channels made within it can be made by additive manufacturing.

At their free end, that is to say at their end opposite the corresponding connection port, the fluid inlet and outlet channels 60, 61, 70 and 71 can be connected to the first refrigerant fluid manifold 3 according to different embodiments, and in particular be directly connected by welding or brazing of the connection flange on the first manifold, or else be connected via a tubular element as mentioned above. More particularly, the flange is fixed on the manifold in such a way that two channels are arranged directly opposite orifices, not shown in FIG. 3, pierced in the outer wall 33 of the first refrigerant fluid manifold 3. embodiment represented by the present figure, the second fluid inlet channel 61 and the first fluid outlet channel 70 are directly opposite the corresponding orifices of the outer wall 33.

The first fluid inlet channel 60 and the second fluid outlet channel 71 are themselves connected to orifices formed in the first manifold 3 via the tubular elements 82. These tubular elements 82 can in particular take the form of rigid and bent tubes capable of channeling the refrigerant fluid. The tubular elements 82 are advantageously arranged in the extension of the elongation plane of the heat exchange surface 2 so that the heat exchanger 1 has a reduced bulk.

Whether the channels are connected to the first manifold 3 directly or indirectly via the tubular elements 82, connection means 83 can be provided to ensure the sealing of the passage between the channels and the collecting chambers formed in the first manifold. These connection means 83 can for example be end pieces 830 equipped or not with collars 831. The end pieces 830 can in particular be inserts and fitted onto the fluid inlet or outlet channels, or the associated tubular elements, the dimensions of which make it possible to pass through the orifice formed in the outer surface 33 of the first manifold, and to open into the collecting chamber with which the corresponding channel must communicate fluidly.

As mentioned previously, FIG. 3 illustrates a connection device 68 for which the fluid inlet channels 60 and 61 are perpendicular to each other, and the fluid outlet channels 70 and 71 are perpendicular to each other, so that they lead to perpendicular faces. One could however imagine an alternative embodiment, which the present invention intends to cover, in which the fluid inlet channels 60 and 61 would be in continuity with each other so as to open out on opposite faces, and / or in which the fluid outlet channels 70 and 71 are in continuity with each other so as to open out on opposite faces. In such an alternative embodiment, the body 8 of the connection flange 80 would then comprise a fluid inlet channel and a fluid outlet channel on its connection face 86, and a fluid inlet channel and a fluid outlet channel on its opposite face 87. And all the fluid inlet and outlet channels 60, 61, 70 and 71 would be associated with tubular elements 82 so as to connect them to the inlet or outlet portions of fluid 300, 301, 310, 311 respectively.

FIG. 4 is a sectional view of the connection device 68 of FIG. 3 and of the first refrigerant fluid collector 3, which makes visible the fact that the first collector is split into the first collector chamber 30 and the second collector chamber 31, which are themselves respectively divided into a fluid inlet portion 300 and a fluid outlet portion 301, and a fluid inlet portion 310 and a fluid outlet portion 311.

As mentioned above, the connection device 68 comprises a first fluid inlet channel 60, a second fluid inlet channel 61, a first fluid outlet channel 70 and a second fluid outlet channel 71. Each of these channels 60, 61, 70 and 71 is connected to one of the portions 300, 301, 310 and 311 of the collecting chambers 30 and 31, as follows: the first fluid inlet channel 60 is connected to the fluid inlet portion 300 of the first collecting chamber 30, the first fluid outlet channel 70 is connected to the fluid outlet portion 301 of the first collecting chamber 30, the second fluid inlet channel 61 is connected to the fluid inlet portion 310 of the second collecting chamber 31, and the second fluid outlet channel 71 is connected to the fluid outlet portion 311 of the second collecting chamber 31.

“Connected” means that each fluid inlet or outlet channel 60, 61, 70 and 71 has connection means 83, and more particularly a tip 830 and/or a flange 831. Tips 830 and collars 831 thus form means capable of sealingly connecting the fluid inlet or outlet channels 60, 61, 70 and 71 which they decorate to the fluid inlet or outlet portions 300, 301, 310 and 311 to which they are connected.

For this purpose, the end pieces 830 can for example be forced into the outer wall 33 of the refrigerant fluid manifold 3, thus guaranteeing the tightness of the refrigerant fluid loop 10.

One of the end pieces 830 can also be a rigid end piece, and as such serve as a positioning point when assembling the connection flange 8 to the refrigerant fluid manifold 3. In the same way, the flanges 831 can be used abutment means during assembly, thus allowing easy positioning of this connection flange 8 in contact with the refrigerant fluid manifold 3.

Some tips 830 may have a conical shape, as is the case for the fluid inlet 60 and fluid outlet 70 channels according to the embodiment illustrated in the present figure. This conical shape allows the channels in particular to pass through the second collecting chamber 31 and the separating wall 32 without being in contact with the tubes of the second set 5B, in order to open into the first collecting chamber 30 into which the tubes of the first set 5A also open. .

The sealed partition 9 makes it possible to operate a physical and fluidic separation between, on the one hand, the fluid inlet portion 300 of the first collecting chamber 30, the first fluid inlet channel 60, the fluid outlet portion 311 of the second collecting chamber 31 and the second fluid outlet channel 71, and on the other hand the fluid outlet portion 301 of the first collecting chamber 30, the first fluid outlet channel 70, the inlet portion of fluid 310 from the second collecting chamber 31 and the second fluid inlet channel 61.

According to the embodiment represented in FIG. 4, the refrigerant fluid collector 3 is split into two collecting chambers 30 and 31 which are aligned in one direction longitudinal, the second collecting chamber 31 being arranged between the first collecting chamber 30 and the connecting device 68. The connecting device 68 is therefore configured to connect to the fluid inlet conduit and to the fluid outlet conduit two collecting chambers arranged one behind the other, and has for this purpose connection means 83 suitable for two of them to pass through one of these collecting chambers in order to reach the second. In this case, two of the connection means of the connection device 68 pass through the second collecting chamber 31 to connect the first collecting chamber 30.

The present invention also intends to cover embodiments in which the collecting chambers would be distinct, that is to say not individualized within the same collector. It could in particular be two collecting chambers arranged one beside the other in a transverse direction. A body 80 of connection flange 8 could for example be fixed to a first collecting chamber, so that the second fluid inlet channel 61 and the first fluid outlet channel 70 are directly connected to this first collecting chamber, c that is to say without requiring tubular elements 82. The connection flange 8 would comprise a first fluid inlet channel 60 and a second fluid outlet channel 71, themselves equipped with tubular elements 82, these tubular elements 82 being connected to the second collecting chamber arranged transversely next to the first collecting chamber.

Figure 5 schematically illustrates a refrigerant loop 10 including the heat exchanger 1 according to the first embodiment of Figure 1, whose heat exchange surface 2 is crossed by an air flow 100.

This figure makes it more particularly visible that the first collecting chamber 30 of the first refrigerant fluid collector 3 has the inlet portion 300, which is connected to the first fluid inlet channel 60, and the outlet portion 301 which is connected to the first fluid outlet channel 70. And it also makes visible that the second collecting chamber 31 of the first refrigerant fluid collector 3 has the inlet portion 310, which is connected to the second fluid inlet channel 61, and the outlet portion 311 which is connected to the second fluid outlet channel 71.

Within the refrigerant loop 10, the fluid inlet portion 300 of the first collecting chamber 30 and the fluid inlet portion 310 of the second collecting chamber 31 are therefore fluidically connected via connection device 68. Indeed, the fluid inlet portions 300 and 310 are respectively connected to the first fluid inlet channel 60 and to the second inlet channel of fluid 61, thus allowing the supply of the exchange surface 2 with refrigerant fluid through the fluid inlet conduit 6.

In this refrigerant loop 10, the outlet portion 301 of the first collecting chamber 30 and the outlet portion 311 of the second collecting chamber 31 are also fluidically connected; they are respectively connected to the first fluid outlet channel 70 and to the second fluid outlet channel 71, allowing the evacuation of the refrigerant fluid leaving the exchange surface 2 via the fluid outlet conduit 7.

The heat exchanger 1 comprises at least a first refrigerant circuit 50A consisting of the first fluid inlet channel 60 of the connection device 68, of the fluid inlet portion 300 of the first collecting chamber 30 of the first collector refrigerant fluid 3 fluidically connected to the tubes of the first set 5A, of the tubes of the first set 5A, of the first collecting chamber 40 of the second manifold 4 fluidically connected to the tubes of the first set 5A, of the fluid outlet portion 301 of the first collecting chamber 30 of the first refrigerant fluid collector 3 fluidly connected to the tubes of the first assembly 5A and of the first fluid outlet channel 70.

The first fluid inlet channel 60 is configured to be fluidically connected to a first portion of the refrigerant loop, and the first fluid outlet channel 70 is configured to be fluidically connected to a second portion of the fluid loop refrigerant.

The heat exchanger 1 also comprises at least one second refrigerant circuit 50B consisting of the second fluid inlet channel 61 of the connection device 68, of the fluid inlet portion 310 of the second collecting chamber 31 of the first coolant manifold 3 fluidically connected to the tubes of the second set 5B, of the tubes of the second set 5B, of the second collecting chamber 41 of the second coolant manifold 4 fluidically connected to the tubes of the second set 5B, of the outlet portion of fluid 311 from the second collecting chamber 31 of the first fluid collector 3 fluidically connected to the tubes of the second set 5B and of the second fluid outlet channel 71.

The second fluid inlet channel 61 is configured to be fluidically connected to the first portion of the refrigerant loop, and the second fluid outlet channel 71 is configured to be fluidically connected to the second portion of the fluid loop refrigerant.

The collecting chambers within the same collector being fluidically distinct from each other and the tubes of the first set 5A and the tubes of the second set 5B also being distinct from each other, it is understood that the portion of refrigerant fluid which flows in the first circuit of refrigerant fluid 50A can circulate within the heat exchanger independently of the portion of refrigerant fluid which flows in the second circuit of refrigerant fluid 50B, before being grouped together again in a common flow at the outlet of the heat exchanger.

Such an arrangement makes it possible in particular to circulate the refrigerant fluid within the exchange surface 2, and by extension within the heat exchanger 1, according to two distinct and opposite directions of circulation in neighboring tubes.

When the coolant takes the first coolant circuit 50A, the coolant is routed to the heat exchanger 1 via the fluid inlet pipe 6 arranged in the connection device 68. It circulates in the first inlet channel 60 then through the tubes of the first set 5A which are arranged opposite the first face 91 of the sealed partition 9, from the inlet portion 300 of the first collecting chamber 30 of the first refrigerant fluid collector 3 to the first collecting chamber 40 of the second refrigerant fluid collector 4. It then borrows the tubes of the first set 5A which are arranged opposite the second face 92 of the sealed partition 9 in order to reach the outlet portion 301 from the first collecting chamber 30 of the first refrigerant fluid collector 3, where it passes through the first fluid outlet channel 70 to reach the fluid outlet conduit 7.

The second refrigerant fluid circuit 50B corresponds to a circulation of the refrigerant fluid from the fluid inlet pipe 6 arranged in the connection device 68. The refrigerant fluid circulates through the second inlet channel 61 then, via tubes of the second set 5B which are arranged opposite of the second face 92 of the sealed partition 9, from the inlet portion 310 of the second collecting chamber 31 of the first manifold 3 as far as the second collecting chamber 41 of the second refrigerant fluid manifold 4. The refrigerant fluid then circulates in the tubes of the second set 5B arranged opposite the first face 91 of the sealed partition 9 to be routed to the outlet portion 311 of the second collecting chamber 31 of the first refrigerant fluid collector 3, where it passes through the second fluid outlet channel 71 to join the fluid outlet duct 7.

With regard to the tubes which are arranged in the part of the heat exchange surface opposite the first face 91 of the sealed partition 9, there is thus a portion of the flow of refrigerant fluid which circulates in a first direction, from the first manifold to the second manifold, in the tubes of the second set of tubes 5B and the other portion of the refrigerant flow which circulates in the other direction, from the second manifold to the first manifold, in the tubes of the first set of tubes 5A . The two types of tubes being arranged alternately in the stack of tubes of the heat exchange surface, it is thus ensured that the refrigerant fluid circulating in two neighboring tubes circulates in opposite directions.

It should be noted that the refrigerant is intended to exchange calories with an air flow passing through the heat exchange surface. The temperature of the refrigerant when it enters the heat exchanger is different from its temperature when it leaves this exchanger, and in particular the temperature decreases between the inlet and the outlet when the heat exchanger operates in evaporator mode . The cross circulation as it has just been mentioned makes it possible to circulate side by side a portion of refrigerant fluid close to an inlet portion, and therefore at a first temperature value, and a portion of refrigerant fluid close to 'an outlet portion, and therefore at a second temperature value.

These two directions of circulation of the refrigerant fluid within the heat exchange surface 2 make it possible to achieve a better distribution of the temperature within the latter, and this contributes to preventing the formation of frost by avoiding gradients significant temperature changes from one zone to another of the heat exchange surface and the risk that the cold zones thus generated contribute to the formation of frost if the humidity in the air has condensed beforehand to form droplets on the surface of the heat exchanger. FIG. 6 schematically illustrates a refrigerant fluid loop 10 according to the second embodiment, the tubes of the first set 5A and of the second set 5B having the same extension length. It is understood that these tubes 5 are offset with respect to the median plane M, the tubes of the first set 5A being offset towards the second collector 4 and the tubes of the second set 5B being offset in the direction of the first collector 5B.

According to this second embodiment, the heat exchanger 1 comprises at least a first refrigerant circuit 50A consisting of the first fluid inlet channel 60 of the connection device 68, of the fluid inlet portion 300 of the first collecting chamber 30 of the first refrigerant fluid collector 3 fluidically connected to the tubes of the first set 5A, of the tubes of the first set 5A, of the second collecting chamber 41 of the second manifold 4 fluidically connected to the tubes of the first set 5A, of the portion of fluid outlet 301 of the first collecting chamber 30 of the first refrigerant fluid collector 3 fluidically connected to the tubes of the first assembly 5A and of the first fluid outlet channel 70.

The heat exchanger 1 also comprises at least one second refrigerant circuit 50B consisting of the second fluid inlet channel 61 of the connection device 68, of the fluid inlet portion 310 of the second collecting chamber 31 of the first coolant manifold 3 fluidically connected to the tubes of the second set 5B, of the tubes of the second set 5B, of the first collecting chamber 40 of the second coolant manifold 4 fluidically connected to the tubes of the second set 5B, of the outlet portion of fluid 311 from the second collecting chamber 31 of the first fluid collector 3 fluidly connected to the tubes of the second set 5B and the second fluid outlet channel 71.

When the coolant takes the first coolant circuit 50A, the coolant is routed to the heat exchanger 1 via the fluid inlet pipe 6 arranged in the connection device 68. It circulates in the first inlet channel 60 then through the tubes of the first set 5A which are arranged opposite the first face 91 of the sealed partition 9, from the inlet portion 300 of the first collecting chamber 30 of the first refrigerant fluid collector 3 to the second collecting chamber 41 of the second refrigerant fluid collector 4. It then takes the tubes of the first set 5A which are arranged opposite the second face 92 of the sealed partition 9 in order to reach the outlet portion 301 of the first collecting chamber 30 of the first refrigerant fluid collector 3, where it passes through the first fluid outlet channel 70 to reach the fluid outlet duct 7.

The second refrigerant fluid circuit 50B corresponds to a circulation of the refrigerant fluid from the fluid inlet pipe 6 arranged in the connection device 68. The refrigerant fluid circulates through the second inlet channel 61 then, via tubes of the second set 5B which are arranged opposite the second face 92 of the sealed partition 9, from the inlet portion 310 of the second collecting chamber 31 of the first collector 3 to the first collecting chamber 40 of the second collector of refrigerant fluid 4. The refrigerant fluid then circulates in the tubes of the second set 5B arranged facing the first face 91 of the sealed partition 9 to be routed to the outlet portion 311 of the second collecting chamber 31 of the first manifold refrigerant fluid 3, where it passes through the second fluid outlet channel 71 to join the fluid outlet conduit 7.

The present invention thus proposes a heat exchanger included in a refrigerant loop, which is intended to limit the formation of frost on this heat exchanger while having a reduced size, with tubes of two sets which are stacked in the same plane of the heat exchange surface, collectors which comprise several collecting chambers aligned in the extension of this plane of the heat exchange surface, and a connection device arranged in the extension of the collecting chambers and of the surface of heat exchange. The present invention cannot however be limited to the means and configurations described and illustrated here and it also extends to any equivalent means and configuration as well as to any technically effective combination of such means.

Claims

1. Heat exchanger (1) for a coolant loop (10), comprising a heat exchange surface (2), a first coolant manifold (3) and a second coolant manifold (4) arranged respectively at a first longitudinal end (21) of the heat exchange surface (2) and at a second longitudinal end (22) of the heat exchange surface (2), characterized in that at least one of the collectors refrigerant fluid is divided into a first collecting chamber (30) and a second collecting chamber (31) separated by a dividing wall (32), each of these collecting chambers (30, 31) respectively comprising a fluid inlet portion (300, 310) and a fluid outlet portion (301, 311), and in that a connection device (68) associated with the at least one refrigerant fluid manifold comprises a refrigerant fluid inlet conduit (6) split into a first fluid inlet channel (60) connected to the fluid inlet portion (300) of the first collection chamber (30) and a second fluid inlet channel (61) connected to the fluid inlet portion (310) of the second collection chamber (31 ), and a coolant outlet conduit (7) forming the junction between a first fluid outlet channel (70) connected to the fluid outlet portion (301) of the first collecting chamber (30) and a second channel fluid outlet (71) connected to the fluid outlet portion (311) of the second collecting chamber (31).

2. Heat exchanger (1) according to the preceding claim, wherein the connection device (68) comprises a connection flange (8) fixed to the at least one refrigerant fluid manifold and in which are formed the two channels of fluid inlet (60, 61) and the two fluid outlet channels (70, 71).

3. Heat exchanger (1) according to the preceding claim, in which the fluid inlet and fluid outlet channels (60, 70) are connected to one of the collecting chambers via tubular elements ( 82) capable of connecting the body (80) of the connection flange (8) to the at least one refrigerant fluid manifold.

4. Heat exchanger (1) according to the preceding claim, wherein the tubular elements (82) are arranged in the extension of a main elongation plane of the heat exchange surface (2).

5. Heat exchanger (1) according to any one of claims 2 to 4, in which the two inlet channels formed in the connection flange (8) extend perpendicular to each other, and/or wherein the two outlet channels formed in the connection flange (8) extend perpendicular to each other.

6. Heat exchanger (1) according to any one of the preceding claims, in which the heat exchange surface (2) comprises tubes (5) configured to channel the refrigerant fluid, these tubes (5) extending longitudinally between the first coolant manifold (3) and the second coolant manifold (4), the tubes (5) being divided into two sets of tubes (5A, 5B), the tubes of a first set (5A) opening into the first collecting chamber (30) of the at least one coolant manifold and the tubes of a second set (5B) opening into the second collecting chamber (31) of the at least one coolant fluid manifold.

7. Heat exchanger (1) according to claim 6, wherein the first collecting chamber (30) and the second collecting chamber (31) of the at least one refrigerant fluid collector are aligned in a longitudinal direction, the first chamber collector (30) being located between the heat exchange surface (2) and the second collector chamber (31), the tubes of the first set (5A) having a longitudinal dimension less than a longitudinal dimension of the tubes of the second set (5B ), these longitudinal dimensions being measured between a median plane (M) extending perpendicularly to the heat exchange surface (2) and the at least one coolant manifold.

8. Heat exchanger (1) according to the preceding claim, wherein the second coolant manifold (4) is split into two collecting chambers (40, 41), the tubes of the first set (5A) opening into a first collecting chamber (40) and the tubes of the second set (5B) opening into a second collecting chamber (41), the tubes of the first set (5A) and the tubes of the second set (5B) being of different extension lengths.

9. Heat exchanger (1) according to claim 7, wherein the second refrigerant fluid collector (4) is split into two collecting chambers (40, 41), the tubes of the first set (5A) opening into a second collecting chamber (41) and the tubes of the second set (5B) opening into a first collecting chamber (40), the tubes of the first set (5A) and the tubes of the second set (5B) being of the same extension length.

10. Heat exchanger (1) according to claim 8, this heat exchanger (1) comprising at least a first refrigerant circuit (50A) consisting of the first fluid inlet channel (60) of the connecting device (68), of the fluid inlet portion (300) of the first collecting chamber (30) of the first refrigerant fluid collector (3) fluidically connected to the tubes of the first set (5A), of the tubes of the first set (5A), of the first collecting chamber (40) of the second collector (4) fluidically connected to the tubes of the first set (5A), of the fluid outlet portion (301) of the first collecting chamber (30) of the first refrigerant fluid collector (3) fluidly connected to the tubes of the first assembly (5A) and of the first fluid outlet channel (70), the first fluid inlet channel (60) being configured to be fluidically connected to a first portion of the refrigerant fluid loop and the first fluid outlet channel (70) being configured to be fluidically connected to a second portion of the refrigerant fluid loop, the heat exchanger ( 1) comprising at least one second refrigerant circuit (50B) consisting of the second fluid inlet channel (61) of the connection device (68), of the fluid inlet portion (310) of the second collecting chamber (31) of the first collector refrigerant fluid (3) fluidically connected to the tubes of the second set (5B), of the tubes of the second set (5B), of the second collecting chamber (41) of the second refrigerant fluid manifold (4) fluidically connected to the tubes of the second set (5B), of the fluid outlet portion (311) of the second collecting chamber (31) of the first fluid collector (3) fluidically connected to the tubes of the second set (5B) and of the second fluid outlet channel (71 ), the second fluid inlet channel (61) being configured to be fluidically connected to the first portion of the refrigerant loop and the second fluid outlet channel (71) being configured to be fluidically connected to the second portion of the a refrigerant loop, the tubes of the first set (5A) and the tubes of the second set (5B) being fluidically distinct from each other.

11. Heat exchanger (1) according to claim 9, this heat exchanger (1) comprising at least a first refrigerant fluid circuit (50A) consisting of the first fluid inlet channel (60) of the connection device (68 ), of the fluid inlet portion (300) of the first collecting chamber (30) of the first refrigerant fluid collector (3) fluidically connected to the tubes of the first set (5A), of the tubes of the first set (5A), of the second collector chamber (41) of the second collector (4) fluidically connected to the tubes of the first set (5A), of the fluid outlet portion (301) of the first collector chamber (30) of the first refrigerant manifold (3) fluidly connected to the tubes of the first set (5A) and the first fluid outlet channel (70), the first fluid inlet channel (60) being configured to be fluidly connected to a first portion of the refrigerant fluid loop and the first fluid outlet channel (70) being configured to be fluidically connected to a second portion of the refrigerant fluid loop, the heat exchanger (1) comprising at least a second fluid circuit refrigerant (50B) consisting of the second fluid inlet channel (61) of the connecting device (68), the fluid inlet portion (310) of the second collecting chamber (31) of the first refrigerant fluid collector ( 3) fluidically connected to the tubes of the second set (5B), of the tubes of the second set (5B), of the first collecting chamber (40) of the second refrigerant fluid collector (4) fluidically connected to the tubes of the second set (5B), of the fluid outlet portion (311) of the second collecting chamber (31) of the first fluid collector (3) fluidically connected to the tubes of the second assembly (5B) and of the second fluid outlet channel (71), the second fluid inlet channel (61) being configured to be fluidically connected to the first portion of the refrigerant loop and the second fluid outlet channel (71) being configured to be fluidically connected to the second portion of the refrigerant fluid, the tubes of the first set (5A) and the tubes of the second set (5B) being fluidically distinct from each other.