Housing for a heat exchanger with exchange bundle

Abstract

The present invention relates to a heat exchanger (1) comprising an exchange bundle (2) intended to be traversed by a heat-transfer liquid and by a gas flow, the exchange bundle (2) comprising a plurality of plates (21) stacked on top of one another along a stacking direction (A), the heat exchanger (1) comprising a housing (3) surrounding the exchange bundle (2) and having at least one upper wall (31), a lower wall (32) and at least one main lateral wall (33), the main lateral wall (33) being arranged in the continuity of the upper wall (31) and / or the lower wall (32), characterized in that the housing (3) comprises at least one intermediate lateral wall (35) interposed between the exchange bundle (2) and the main lateral wall (33).

Description

[0001] DESCRIPTION

[0002] Title of the invention: HEAT EXCHANGER HOUSING WITH EXCHANGE BEAM.

[0003] The present invention relates to the field of heat exchangers, and more particularly to such heat exchangers equipped with an exchange bundle formed from a stack of plates.

[0004] Such heat exchangers are intended, for example, to equip vehicles, and in particular motor vehicles. Within such vehicles, these heat exchangers ensure the thermal regulation of a first fluid, such as an air flow, circulating through the heat exchanger in a dedicated circulation space by a second fluid, such as a coolant, circulating in dedicated channels within the heat exchanger.

[0005] Furthermore, motor vehicles are increasingly equipped with a turbocharger to increase the power of the combustion engine of said vehicles. These turbochargers direct a flow of air towards an intake manifold and compress it before this air flow reaches the combustion chamber. This air flow, commonly called "charge air", helps to supercharge the engine, allowing it to achieve better fuel combustion.

[0006] It is known to associate with the turbocharger a heat exchanger intended to cool the air flow or "charge air" to increase the density of the intake air of the turbocharged engine. These heat exchangers, also called "charge air coolers", generally comprise an exchange core formed by a stack of plates between which the charge air flow circulates. This stack of plates is traversed by a fluid communicating with each of the plates by channels arranged within said plates. An exchange of calories being able to take place between the plates, or, where appropriate, between radiant elements arranged between two adjacent plates, and the charge air flow.

[0007] Such an exchange bundle is housed in a housing surrounding the exchange bundle. This housing is generally formed of four pieces forming cheeks joined to each other to form a parallelepiped enclosing the exchange bundle, two opposite faces of this parallelepiped, distinct from the cheeks, being open and intended to be crossed by the flow of supercharging air. The cheeks are secured to each other by brazing their ends placed end to end. Such a solution tends to undergo wear over time at these brazing points. This wear can lead, under the effect of the pressure of the supercharging air circulating through the heat exchanger, to an opening through which the flow of supercharging air can escape, reducing the efficiency of the turbocharger to increase the power of the thermal engine.

[0008] The present invention proposes to overcome the drawbacks of the prior art, and in particular to limit the formation of openings at the brazing points joining two cheeks of the housing. The present invention also proposes to improve the mechanical resistance of the cheeks to the pressure exerted by the supercharging air flow and to make the brazings used to form the housing more resistant.

[0009] In this context, the main subject of the present invention is a heat exchanger comprising an exchange bundle intended to be traversed by a heat transfer liquid and by a gas flow, the exchange bundle comprising a plurality of plates stacked on top of each other along a stacking direction and delimiting between at least two adjacent plates at least one circulation conduit for the heat transfer liquid, each circulation conduit communicating by a first end with a first channel of the exchange bundle and by a second end with a second channel of the exchange bundle, the heat exchanger comprising a housing surrounding the exchange bundle and comprising at least one upper cheek, a lower cheek and at least one main lateral cheek, the main lateral cheek being arranged in the continuity of the upper cheek and / or the lower cheek,characterized in that the housing comprises at least one intermediate lateral cheek interposed between the exchange beam and the main lateral cheek.,

[0010] The heat exchanger housing partially surrounds the exchange bundle. This housing is a parallelepiped open on two opposite faces allowing the gas flow to circulate through the exchange bundle. The other four faces, forming the different cheeks of said parallelepiped, are formed by the main lateral cheeks, the upper cheek and the lower cheek. The circulation duct through which a heat transfer fluid circulates within the exchange bundle is delimited by a pair of plates, between each pair of plates the exchange bundle comprises a circulation space in which heat dissipation means are provided. These heat dissipation means are formed by fins making it possible to increase the exchange surface between the heat exchanger and the gas flow.

[0011] The main side cheek is arranged in continuity with the upper cheek and the lower cheek so that the housing is airtight at the junction between these cheeks. More precisely, the main side cheek is arranged in continuity with the upper cheek and the lower cheek by an alignment of the internal surface of each of these cheeks, this internal surface being the surface of said cheeks intended to be opposite the exchange beam.

[0012] According to a characteristic of the invention, the first channel and the second channel are formed by stacking the plates in a stacking direction. These channels are formed by stacking the plates, more precisely, at the level of each of the plates is provided a collar making it possible to form a channel. It is understood that each of the plates comprises two collars making it possible, when the plates are stacked on top of each other, to form the first channel and the second channel. According to a characteristic of the invention, the intermediate lateral cheek has a dimension greater than a dimension of the main lateral cheek against which said intermediate lateral cheek bears, these dimensions being measured parallel to the stacking direction. It is understood that the intermediate lateral cheek extends beyond the main lateral cheek in a direction parallel to the stacking direction of the plates.It should be noted that the intermediate lateral cheek rests against the main lateral cheek so that these lateral cheeks are pressed against each other.

[0013] According to a characteristic of the invention, the housing has at least one junction zone between at least one main lateral cheek and the upper cheek and / or the lower cheek, the intermediate lateral cheek extending along the main lateral cheek, the lower cheek and / or the upper cheek and said junction zone. It is understood that the intermediate lateral cheek completely covers the junction between the main lateral cheek and the lower cheek and / or the upper cheek. This covering of the junction between these cheeks forms a physical barrier protecting the junction between the main lateral cheek and the upper cheek and / or the lower cheek.

[0014] According to a characteristic of the invention, the junction zone comprises at least a first brazing between the intermediate lateral cheek and the upper cheek and / or the lower cheek, the junction zone comprising a second brazing between the intermediate lateral cheek and the main lateral cheek, the junction zone comprising a third brazing between the main lateral cheek and the upper cheek and / or the lower cheek. Unlike the first brazing and the second brazing, the third brazing is an edge-to-edge brazing between the main lateral cheek and the lower cheek and / or the upper cheek. This edge-to-edge brazing makes it possible to align the main lateral cheek in the continuity of the upper cheek and / or the lower cheek. According to a characteristic of the invention, the housing comprises a pre-assembly means between the intermediate lateral cheek and the main lateral cheek against which said intermediate lateral cheek bears.Such a pre-assembly means advantageously makes it possible, when assembling the heat exchanger, to assemble the main side cheek and the intermediate side cheek at the same time. It is further understood that the pre-assembly means makes it possible to ensure that each of said cheeks is positioned precisely relative to the other.

[0015] According to a characteristic of the invention, the preassembly means comprises a cooperation between at least one projecting element and a hole, the projecting element coming from one of the side cheeks and the hole being provided in the other side cheek. It should be noted that, without departing from the scope of the invention, the projecting element and the hole may be provided on any one of the intermediate or main side cheeks provided that the projecting element is provided on one of the side cheeks and the hole on the other.

[0016] According to a characteristic of the invention, the intermediate lateral cheek comprises a first edge in contact with the upper cheek and a second edge in contact with the lower cheek.

[0017] According to a characteristic of the invention, the upper cheek and / or the lower cheek comprises at least one edge provided with a fillet, the first edge and / or the second edge of the intermediate lateral cheek having a rounded shape complementary to the fillet. It is understood that the first edge and / or the second edge have a shape allowing the main lateral cheek to fit the upper cheek and / or the lower cheek.

[0018] According to a characteristic of the invention, the housing comprises two intermediate side cheeks, each being associated with a main side cheek.

[0019] Other characteristics, details and advantages of the invention will emerge more clearly on reading the description which follows on the one hand, and several examples of embodiment given for informational and non-limiting purposes with reference to the appended schematic drawings on the other hand, in which:

[0020] [Fig.i] represents a heat exchanger intended to equip a motor vehicle;

[0021] [Fig.2] represents an exchange bundle of the heat exchanger represented by figure i;

[0022] [Fig.3] represents two side cheeks of a housing in which the exchange beam represented by figure 2 is housed;

[0023] [Fig.4] represents a housing intended to accommodate the exchange beam visible in figure 2;

[0024] [Fig.5] represents an exploded view of a junction area of ​​the housing represented by figure 4.

[0025] The features, variants and different embodiments of the invention may be combined with each other in various combinations, provided that they are not incompatible or mutually exclusive. In particular, variants of the invention may be conceived comprising only a selection of features described below in isolation from the other features described, if this selection of features is sufficient to confer a technical advantage or to differentiate the invention from the state of the art.

[0026] In the figures, elements common to several figures retain the same reference.

[0027] In the following description, we will refer to an orientation depending on the Longitudinal, Vertical and Transverse axes as they are arbitrarily defined by the trihedron L, V, T represented in figures 1 to 5.

[0028] Figure 1 represents a heat exchanger 1 intended to be traversed by a gas flow. In the embodiment shown, this gas flow is a flow of compressed air upstream of the heat exchanger 1, that is to say before entering the heat exchanger 1, by a turbocharger and intended to be sent to an intake manifold of a heat engine at the outlet of the heat exchanger i.

[0029] The heat exchanger i comprises an exchange bundle 2 formed of a plurality of plates 21 stacked on top of each other along a stacking direction A substantially parallel to the axis V. Each of the plates 21 extends in a main longitudinal elongation direction, substantially parallel to the axis L. It is understood that the plates 21 are stacked on top of each other in a direction perpendicular to their main longitudinal elongation direction.

[0030] The exchange bundle 2 is housed in a housing 3, as visible in sectional view, isolated from the other elements of the heat exchanger 1, in FIG. 4, comprising an upper cheek 31, a lower cheek 32 opposite the upper cheek 31 and at least one main lateral cheek 33. The at least one main lateral cheek 33 is arranged in the continuity of the upper cheek 31 and the lower cheek 32.

[0031] It should be noted that in the embodiment shown, the housing 3 comprises two main lateral cheeks 33 distributed at each longitudinal end of the plates 21, that is to say on either side of the exchange bundle 2 in the direction of main longitudinal elongation of the plates 21. It is understood that the housing 3 surrounds, at least partially, the exchange bundle 2 and forms a parallelepiped, four faces of which are formed by the upper cheek 31, the lower cheek 32 and the two main lateral cheeks 33.

[0032] Among the faces of said housing 3 forming the parallelepiped, two opposite faces are open and allow the air flow to circulate through the exchange bundle 2. These two open opposite faces are each connected to an arch 34 by which the air flow is directed so as to circulate through the exchange bundle 2.

[0033] The exchange bundle 2 is intended to be traversed by a heat transfer liquid capable of carrying out an exchange of calories with the air flow. For this purpose, the upper cheek 31 comprises an inlet opening 311 for the heat transfer liquid through which the heat transfer liquid is capable of entering the exchange bundle 2. This inlet opening 311 is connected to a first channel 22 arranged in the exchange bundle 2 in the stacking direction A of the plates 21. The upper cheek 31 comprises an outlet opening 312 for the heat transfer liquid through which the heat transfer liquid is capable of leaving the exchange bundle 2. This outlet opening 312 is connected to a second channel 23 which, like the first channel 22, is arranged in the exchange bundle 2 in the stacking direction A of the plates 21.

[0034] Two adjacent plates 21 of the exchange bundle 2 stacked against each other in the stacking direction A participate together in delimiting a circulation conduit 24 for the heat transfer liquid. This circulation conduit 24 communicates via a first end or inlet end 241 with the first channel 22 and via a second end or outlet end 242 with the second channel 23. It is understood that the heat transfer liquid entering the heat exchanger 1 through the inlet opening 311 of the upper cheek 31 circulates in the exchange bundle 2 through the first channel 22 and is distributed in each circulation conduit 24 formed between two adjacent plates 21.The heat transfer liquid circulates from the inlet end 241 of the circulation duct 24 to the outlet end 242 of said circulation duct 24 communicating with the second channel 23 connected with the outlet opening 312 of the upper cheek 31 through which the heat transfer liquid is able to exit the heat exchanger 1.

[0035] Furthermore, the housing 3 comprises, according to the invention, at least one intermediate lateral cheek 35 interposed between the exchange bundle 2 and the at least one main lateral cheek 33. In the embodiment shown, the housing 3 comprises two main lateral cheeks 33, each being associated with an intermediate lateral cheek 35 interposed between one of the main lateral cheeks 33 and the exchange bundle 2. At the level of these lateral cheeks 33 and 35, a cooperation formed by a preassembly means 4, more particularly visible in FIG. 3, makes it possible to position the main lateral cheek 33 relative to the intermediate lateral cheek 35.

[0036] Figure 2 illustrates a view of the exchange bundle 2 in the transverse direction, that is to say in a direction parallel to the axis T. As mentioned previously, the exchange bundle 2 comprises a plurality of plates 21 stacked on top of each other in the stacking direction A. Two adjacent plates 21, delimiting between them a circulation duct 24, are separated from two other plates 21, also delimiting a circulation duct 24, by a circulation space 25 for the gas flow. This circulation space 25 is, in the embodiment shown, partially filled by radiant elements 26.

[0037] The radiant elements 26 are formed by a corrugated sheet extending mainly in the longitudinal direction L, that is to say along the axis L, substantially parallel to the plates 21. During operation of the heat exchanger 1 and when the air flow passes through the circulation space 25, an exchange of calories takes place between the metal wall, forming the radiant elements 26, and the air flow such that the calories of the metal wall are exchanged with the heat transfer liquid circulating in the circulation duct 24 delimited between two adjacent plates 21. It should be noted that the shape of the radiant elements 26 makes it possible to increase the exchange surface between the metal wall and the air flow.Of course, the radiant elements 26 can take other forms as long as these forms make it possible to increase the exchange surface between the metal wall and the air flow and therefore to increase the number of calories capable of being transmitted to the heat transfer liquid.

[0038] As mentioned previously, the exchange beam 2 comprises two intermediate lateral cheeks 35, each being associated with a main lateral cheek 33. These intermediate lateral cheeks 35 extend in a vertical direction, that is to say parallel to the stacking direction A, over the entire height of the exchange beam 2, the height being defined as the elongation dimension of the object concerned in a vertical direction, parallel to the axis V.

[0039] More precisely, these intermediate lateral cheeks 35 have an internal face 351 intended to be opposite the exchange beam 2 and an external face 352, opposite the internal face 351, intended to be opposite, at least in part, an associated main lateral cheek 33.

[0040] Each of the main lateral cheeks 33 is arranged in the continuity of the lower cheek 32 and / or the upper cheek 31. To this end, the lower and upper cheeks 31 and 32, extending, in the embodiment shown, in a main longitudinal elongation direction between a first longitudinal end 36 and a second longitudinal end 37, have at least one edge forming a fillet 38 allowing the first and second longitudinal ends 36 and 37 to extend in a vertical direction, perpendicular to the stacking direction A. Such a fillet 38 allows the main lateral cheeks 33 to be arranged in the continuity of the upper cheek 31 and the lower cheek 32.

[0041] The intermediate lateral cheeks 35 are in contact with the upper and lower cheeks 31 and 32 and more particularly, at the fillet 38. As visible in FIG. 5, the portion of the intermediate lateral cheeks 35 in contact with the upper and lower cheeks 31 and 32 at the fillet 38 has a shape complementary to the fillet 38. More precisely, each intermediate lateral cheek 35 comprises a first edge 353 forming a rounded shape having a shape complementary to the fillet 38 of the upper cheek 31 and intended to be in contact with the latter. Each intermediate lateral cheek 35 also comprises a second edge 354, opposite the first edge 353, forming a rounded shape having a shape complementary to the fillet 38 of the lower cheek 32 and intended to be in contact with the latter.

[0042] Furthermore, it is understood that each intermediate lateral cheek 35 extends beyond the associated main lateral cheek 33 along a vertical dimension, measured parallel to the stacking axis A. In other words, the intermediate lateral cheek 35 has a dimension greater in the stacking direction A of the plates 21 than a dimension of the main lateral cheek 33 against which said intermediate lateral cheek 35 bears.

[0043] Figure 3 illustrates an intermediate side cheek 35 and a main side cheek 33 against which the intermediate side cheek 35 bears. The housing 3, and more particularly the main side cheek 33 and the intermediate side cheek 35, has a pre-assembly means 4. This pre-assembly means 4 is formed by the cooperation between at least one hole and a projecting element. More precisely, in the embodiment shown, the pre-assembly means 4 is formed by the cooperation between two holes 41 provided in the main side cheek 33 and two projecting elements 42 of the intermediate side cheek 35. A projecting element 42 of the intermediate side cheek 35 is intended to be housed in a hole 41 of the main side cheek 33.For this purpose, the holes 41 advantageously have a round shape complementary to the shape of the projecting elements 42 and the diameter of which is substantially equal to the diameter of the projecting elements 42.

[0044] The pre-assembly means 4 advantageously makes it possible to precisely position the intermediate lateral cheek 35 in abutment against the main lateral cheek 33. It is understood that the pre-assembly means 4 comprising two holes 41 cooperating with two projecting elements 42 advantageously makes it possible to block a movement of one of the lateral faces 33, 35 relative to the other in, on the one hand, a direction parallel to the axis L and, on the other hand, a direction parallel to the axis V.

[0045] It should be noted that in the embodiment shown, the projecting elements 42 extend from the external face 352 of the intermediate lateral cheek 35 towards the main lateral cheek 33. Of course, these projecting elements 42 can extend from any one of the lateral cheeks 33' 35 towards the associated lateral cheek 33, 35 comprising holes 41 capable of receiving the projecting elements 42.

[0046] Figure 4 schematically illustrates a sectional view of the insulated housing 3 of the heat exchanger 1. More particularly, Figure 4 illustrates junction zones 5 at which the intermediate lateral cheek 35, the main lateral cheek 33 and the upper cheek 31 and / or the lower cheek 32 are secured to each other. These junction zones 5 are located at the first and second longitudinal ends 36 and 37 of the upper cheek 31 and the lower cheek 32.

[0047] As mentioned previously, the main lateral cheek 33 is arranged in continuity with the lower cheek 32 and the upper cheek 31. This arrangement is such that the face of the main lateral cheek 33, intended to be in contact with the intermediate lateral cheek 35, is in continuity with the face of the lower cheek 32 or the upper cheek 31, intended to be in contact with the intermediate lateral cheek 35, and more particularly the internal face 352 of this intermediate lateral cheek 35.

[0048] It is understood that the junction between the main lateral cheek 33 and the upper cheek 31 or the lower cheek 32 makes it possible to form a smooth surface against which the external face 352 of the intermediate lateral cheek 35 bears.

[0049] At each junction zone 5, the main side cheek 33, the intermediate side cheek 35 and the lower cheek 32 or the upper cheek 31 are brazed against each other by a very high temperature brazing process.

[0050] Figure 5 illustrates a junction zone 5 between the main lateral cheek 33, the associated intermediate lateral cheek 35 and the lower cheek 32. More specifically, Figure 5 illustrates an exploded view of said junction zone 5, in which the intermediate lateral cheek 35, the main lateral cheek 33 and the lower cheek 32 are separated from each other. It should be noted that the description which will follow in connection with a junction zone 5 of the housing 3, applies mutatis mutandis to each junction zone 5 of the housing 3. The brazing of the intermediate lateral cheek 35, the main lateral cheek 33 and the lower cheek 32 is carried out by heating to a high temperature a coating interposed between two of said cheeks 33, 35, 32.For this purpose, the junction zone 5 comprises a first coating 51 disposed between the intermediate lateral cheek 35 and the main lateral cheek 33 and a second coating 52 disposed between the lower cheek 32 and the intermediate lateral cheek 35. It is understood that FIG. 5 illustrates a junction zone 5 before the housing 3 has been heated to a very high temperature. When the housing 3, comprising the coatings 51 and 52, is heated to a very high temperature, a third coating 53 is formed by migration, in particular of a portion of the first and second coatings 51, 52, said third coating 53 being disposed between the main cheek 33 and the lower cheek 32. Each of the coatings 51, 52 and 53 then forms a polymerized layer secured between two adjacent cheeks.The fusion of the sacrificial layers that are the first coating 51 and the second coating 52, the formation of the third coating 53 and the mixing of said first, second and third coatings 51, 52, 53, ensure a bonding of the parts concerned, once cooled.

[0051] The first coating 51 is arranged so as to be in contact with the external face 352 of the intermediate lateral cheek 35 and the face of the main lateral cheek 33 opposite the external face 352 of the intermediate lateral cheek 35. The second coating 52 is arranged at the first longitudinal end 36 of the lower cheek so as to be in contact with the external face 352 of the intermediate lateral cheek 35 and the lower cheek 32 and between the fillet 38 of the lower cheek and the second edge 354 of the intermediate lateral cheek 35 forming a complementary rounding of the fillet 38. The third coating 53 is, unlike the first coating 51 and the second coating 52, formed between the main lateral cheek 33 and the first longitudinal end 36 of the lower cheek so that the brazing formed by this third coating 53 is an edge-to-edge brazing between the main lateral cheek 33 and the lower cheek 32.It is understood that the housing 3 comprises, at least at the level of each junction zone 5, a first brazing between the intermediate lateral cheek 35 and the upper cheek 31 and / or the lower cheek 32, a second brazing between the intermediate lateral cheek 35 and the main lateral cheek 33 and a third brazing between the main lateral cheek 33 and the upper cheek 31 and / or the lower cheek 32. The joining of the different cheeks at the level of each junction zone 5 allows the housing 3 to be hermetically sealed at the level of each of the faces distinct from the faces through which the gas flow enters the exchange bundle 2. The invention as it has just been described achieves the aims it had set itself, and makes it possible to propose a heat exchanger within which the lateral cheeks of the housing are hermetically reinforced.Variants not described here could be implemented without departing from the context of the invention, provided that in accordance with the invention, they comprise a heat exchanger in which an intermediate lateral cheek is interposed between the exchange bundle and a main lateral cheek.

Claims

DEMANDS 1. Heat exchanger (i) comprising a heat exchanger bundle (2) for the flow of a heat transfer fluid and a gas flow, the heat exchanger bundle (2) comprising a plurality of plates (21) stacked one on top of the other along a stacking direction (A) and delimiting between at least two adjacent plates (21) at least one circulation channel (24) for the heat transfer fluid, each circulation channel (24) communicating by a first end (241) with a first channel (22) of the heat exchanger bundle (2) and by a second end (242) with a second channel (23) of the heat exchanger bundle (2), the heat exchanger (i) comprising a casing (3) surrounding the heat exchanger bundle (2) and having at least one upper cheek (31), one lower cheek (32) and at least one main side cheek (33), the main side cheek (33) being arranged in continuity with the upper cheek (31) and / or the lower cheek (32),characterized in that the housing (3) comprises at least one intermediate side panel (35) interposed between the exchange beam (2) and the main side panel (33).

2. Heat exchanger (1) according to the preceding claim, characterized in that the first channel (22) and the second channel (23) are formed by stacking the plates (21) according to a stacking direction (A).

3. Heat exchanger (1) according to the preceding claim, characterized in that the intermediate side cheek (35) has a dimension greater than one dimension of the main side cheek (33) against which said intermediate side cheek (35) rests, these dimensions being measured parallel to the stacking direction (A).

4. Heat exchanger (1) according to any one of the preceding claims, characterized in that the casing (3) has at least one junction zone (5) between at least one main side cheek (33) and the upper cheek (31) and / or the lower cheek (32), the intermediate side cheek (35) extending along the main side cheek (33), the lower cheek (32) and / or the upper cheek (31) and said junction zone (5).

5. Heat exchanger (i) according to the preceding claim, characterized in that the junction zone (5) comprises at least a first brazing between the intermediate side cheek (35) and the upper cheek (31) and / or the lower cheek (32), the junction zone (5) comprising a second brazing between the intermediate side cheek (35) and the main side cheek (33), the junction zone (5) comprising a third brazing between the main side cheek (33) and the upper cheek (31) and / or the lower cheek (32).

6. Heat exchanger (1) according to any one of the preceding claims, characterized in that the housing (3) includes a pre-assembly means (4) between the intermediate side cheek (35) and the main side cheek (33) against which said intermediate side cheek (35) rests.

7. Heat exchanger (1) according to the preceding claim, characterized in that the pre-assembly means (4) comprises cooperation between at least one protruding element (42) and a hole (41), the protruding element (42) being originating from one of the side cheeks (33, 35) and the hole (41) being provided in the other side cheek (33, 35).

8. Heat exchanger (1) according to any one of the preceding claims, characterized in that the intermediate side cheek (35) comprises a first edge (353) in contact with the upper cheek (31) and a second edge (354) in contact with the lower cheek (32).

9. Heat exchanger (1) according to the preceding claim in which the upper cheek (31) and / or the lower cheek (32) comprises at least one edge provided with a fillet (38), the first edge (353) and / or the second edge (354) of the intermediate side cheek (35) having a complementary rounding of the fillet (38).

10. Heat exchanger (1) according to any one of the preceding claims, characterized in that the casing (3) comprises two intermediate side cheeks (35), each being associated with a main side cheek (33).

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