EP4078056A1

EP4078056A1 - Heat exchanger with attached collector

Info

Publication number: EP4078056A1
Application number: EP20845403.3A
Authority: EP
Inventors: Sébastien Devedeux; Mickael GAMEIRO; Mateusz LIPOWSKI
Original assignee: Valeo Systemes Thermiques SAS
Current assignee: Valeo Systemes Thermiques SAS
Priority date: 2019-12-13
Filing date: 2020-12-11
Publication date: 2022-10-26
Also published as: US20230008850A1; FR3107344B1; FR3107344A1; WO2021116630A1; CN114981605A

Abstract

The present invention relates to a heat exchanger (1) comprising at least one heat exchange bundle (2), a box (4, 6) and a collector (8), the box (4, 6) being arranged at one end (24, 26) of the heat exchange bundle (2), the heat exchange bundle (2) comprising at least one peripheral wall (10) which delimits a housing (18) in which a plurality of tubes (12) extend, inside which tubes a first fluid circulates and around which a second fluid circulates, at least one opening (30) being provided in the peripheral wall (10) and a collector (8) comprising a peripheral edge (40) being arranged so as to cover the opening (30).

Description

Title: Heat exchanger with attached collector.

The present invention relates to the field of heat exchangers and more particularly to the securing of a collector attached to a heat exchange bundle of a heat exchanger.

A heat exchanger, such as a charge air cooler, generally comprises a heat exchange bundle comprising tubes inside which a first fluid circulates. The exchanger also includes inlet or outlet boxes arranged on either side of the heat exchange bundle and for directing the first fluid into the plurality of tubes. The heat exchanger also comprises at least one manifold for irrigating or discharging a second coolant from the heat exchange bundle, the second fluid being intended to exchange calories with the first coolant.

During the heat exchanger manufacturing process, the collectors usually result from a deformation of a peripheral wall of the heat exchange bundle, such that said collector and the peripheral wall of the heat exchange bundle forms a single piece. Nevertheless, it has been observed by the Applicant that this formation of the collector on the peripheral wall generated long-term sealing problems, due to the weakening of the tube at the junction with the collector. The sealing problems at the tube-manifold junction then have the effect of creating leaks of the second fluid towards the first fluid, causing the vehicle equipped with this heat exchanger to fail.

The weakening of the tube-collector junction zone is in particular due to the stress concentration between the collector and the tubes of the bundle during the mechanical stresses seen by the exchanger, in particular during the thermal shocks undergone. The stress concentrations mainly come from the variation in thickness between the manifold and the tubes, the latter being thinner than the manifold. At this junction (or separation) zone, a wedge or a notch will form, which will create stress concentrations during the mechanical stresses seen by the exchanger. The stresses can be purely mechanical, thermal, or even thermomechanical. The object of the present invention is therefore to remedy the drawbacks mentioned above, by designing a manifold whose sealing with the heat exchange bundle is improved and thus making it possible to increase the reliability and the service life of the unit. 'heat exchanger.

The invention therefore relates to a heat exchanger comprising at least one heat exchange bundle, a box and a manifold, the box being disposed at one end of the heat exchange bundle, the heat exchange bundle comprising at least one peripheral wall which delimits a housing in which extends a plurality of tubes within which circulates a first fluid and around which circulates a second fluid, at least one opening being formed on the peripheral wall, the heat exchanger being characterized in that the collector is attached to the peripheral wall, the collector at least partially delimiting a chamber and comprising a peripheral edge which surrounds a window of the collector, the collector being arranged to cover the opening made in the peripheral wall, such that the window is at least partially in line with the opening and that the peripheral edge is at least partially in contact with said pa peripheral king.

The heat exchanger is a device for exchanging calories between two fluids without mixing them. In the context of the invention, this may in particular be a charge air cooler, the function of which is to cool the air coming from a turbocharger before it enters an internal combustion engine. The heat exchanger then comprises an inlet box making it possible to direct the air leaving the turbocharger, here the first fluid, towards the heat exchange bundle and an outlet box making it possible to direct the air leaving the bundle of heat exchange to the internal combustion engine. More precisely, the inlet box and the outlet box are connected to the plurality of tubes formed in the housing of the heat exchange bundle such that the inlet box and / or the outlet box and the plurality of tubes are in fluid communication with each other.

The function of the collector is to direct the second fluid into the housing of the heat exchange bundle, between the plurality of tubes. Thus the opening made on the peripheral wall of the heat exchange bundle is through, that is to say it is open to the housing of the heat exchange bundle. Advantageously, the window of the collector is strictly in line with the opening and it is then understood that the collector, the chamber of which is arranged to cover the opening, allows the circulation of the second fluid between the manifold and heat exchange bundle housing. Advantage is then taken of the peripheral edge which extends against the peripheral wall of the heat exchange bundle as the latter makes it possible to ensure optimum sealing between the collector and the heat exchange bundle. It is also understood that the peripheral edge attached to the heat exchanger makes it possible to increase the thickness of said heat exchanger at the level of the junction between the collector and the heat exchange bundle. This reduces the risk of damage to this zone due to thermal shocks between the first fluid and the second fluid. According to one characteristic of the invention, the peripheral wall of the heat exchange bundle comprises an internal face turned towards the housing and an external face turned towards an environment outside the heat exchange bundle, the peripheral edge of the collector being in contact of the external face of the peripheral wall.

According to one characteristic of the invention, the plurality of tubes extend longitudinally in the housing delimited by the peripheral wall, the opening being formed transversely to the plurality of tubes.

According to an example of the invention, the tubes are arranged in series in a transverse direction of the heat exchanger, perpendicular to the longitudinal direction in which they extend. The opening is then made on the peripheral wall perpendicular to the plurality of tubes in the housing of the heat exchange bundle.

The advantage of such a configuration is that it allows the opening to cover all of the tubes housed in the heat exchange bundle housing and thus to homogenize the circulation of the second fluid around the tubes. According to one characteristic of the invention, the window of the collector and the opening in the peripheral wall are aligned on the same transverse axis and a width of the window being greater than a width of the opening.

Window width and opening width are measured along a line perpendicular to the transverse axis with which the opening and window align. It will be understood from this particular structural characteristic that the peripheral edge does not encroach on the opening. In other words, when using the heat exchanger, the edge peripheral of the collector does not interpose on the path of the second fluid when the latter passes through the opening.

According to one characteristic of the invention, the chamber has a first end of the collector which extends over a first height measured along a plane of symmetry of the chamber and a second end of the collector which extends over a second height measured along the plane of symmetry, the first height being greater than the second height. The first end is the end through which the second fluid enters the manifold chamber.

It will be understood from this feature of the invention that the volume of the chamber is greater at the level of the first end than the volume of the chamber at the level of the second end of the manifold.

During operation of the heat exchanger, the height of the chamber is adapted to the flow rate of the second fluid depending on its position along the second fluid chamber, second fluid. Thus, the reduction in the height of the chamber of the manifold is for example proportional to the reduction in the flow rate of the second fluid in the chamber of the manifold. This feature is taken advantage of in that it makes it possible to obtain a homogeneity of supply to the heat exchange bundle over its second fluid width. Thus, the distribution of the second fluid in the housing is balanced and optimizes the heat exchanges between the first fluid and the second fluid.

According to one characteristic of the invention, the opening comprises a first edge which extends in the longitudinal direction of the heat exchange bundle over a first distance and a second edge which extends in the longitudinal direction of the heat exchange bundle. heat exchange over a second distance, the second distance being equal to the first distance. According to an alternative of the invention, the opening comprises a first edge which extends in the longitudinal direction of the heat exchange bundle over a first distance and a second edge which extends in the longitudinal direction of the heat exchange bundle. heat exchange over a second distance, the second distance being strictly less or even strictly greater than the first distance. During the operation of the heat exchanger, when the second fluid circulates in the chamber of the collector in a direction of flow going from the second edge of the opening to the first edge of the opening, it is understood that the flow of the second fluid in the chamber is greater at the second rim than at the first rim, some of the second fluid having already passed through the opening. Thus, advantageously the longitudinal distance along which the opening extends can be inversely proportional to the flow rate of the second fluid in the chamber of the manifold. This characteristic is taken advantage of in that it makes it possible to homogenize the distribution of the second fluid in the housing of the heat exchange bundle and thus to optimize the heat exchanges between the first fluid and the second fluid.

According to a feature of the invention, at least one rib extends into the opening. Such a rib is made by the material of the peripheral wall of the heat exchange bundle.

More specifically, the at least one rib extends into the opening in the longitudinal direction of the heat exchange beam.

According to a characteristic of the invention, the at least one rib is formed in line with at least one of the tubes of the plurality of tubes of the heat exchange bundle. The function of the rib is then to protect the tube during the operation of the heat exchanger, in particular during the distribution of the second fluid from the manifold to the housing of said heat exchange bundle, as well as from thermal shocks. Advantageously, there are as many ribs in the opening as there are tubes in the heat exchange bundle. Tubes and ribs can therefore be in plurality. According to one characteristic of the invention, a section of the rib is of complementary shape to a section of the tube.

Advantage is taken of such a characteristic in that it reinforces the retention of the tube in the housing of the heat exchange bundle, in particular during the passage of the second fluid through the opening. The tube is thus wedged by the rib. According to one characteristic of the invention, the peripheral edge and the peripheral wall are joined together by brazing. Such securing of the peripheral edge on the peripheral wall ensures optimum sealing between the collector and the heat exchange bundle. The service life of the heat exchanger is thus increased by doubling and increasing the wall thickness at a point of the heat exchanger which is subjected to great stresses. According to a characteristic of the heat exchanger, the heat exchange bundle comprises a first longitudinal end and a second longitudinal end opposite to each other in the longitudinal direction of the heat exchange bundle, the box d 'inlet being disposed at the level of the first longitudinal end and the outlet box being disposed at the level of the second longitudinal end, the heat exchange bundle also comprising a first opening formed on a first longitudinal wall of the peripheral wall and a second opening formed on a second longitudinal wall of the peripheral wall, a first manifold being arranged to cover the first opening and a second manifold being arranged to cover the second opening.

It should be considered that the first opening, the second opening, the first collector and the second collector all conform to the invention as described above.

Each of the first manifold and the second manifold is then connected to a circulation line allowing one to distribute the second fluid and the other to discharge the second fluid, each from their chamber. It is then understood that the second fluid is firstly distributed in the chamber of the first manifold by its circulation pipe, then it passes through the first opening to circulate in the housing defined by the peripheral wall of the heat exchange bundle. and subsequently passes through the second opening to be discharged from the chamber of the second manifold by means of its circulation pipe. Heat exchanges are thus allowed between the first fluid circulating in the plurality of tubes and the second fluid circulating around the tubes, between the first manifold and the second manifold.

It will be noted that the first fluid is a gas mixture while the second fluid is a heat transfer liquid, for example glycol water.

Other characteristics, details and advantages of the invention will emerge more clearly on reading the description which follows, on the one hand, and of several embodiments given by way of indication and not by way of limitation with reference to the appended schematic drawings on the other hand. part, in which: [Fig.1] is a general perspective view of a heat exchanger according to the invention comprising a heat exchange bundle and a collector attached to the heat exchange bundle; [Fig.2] is a general perspective view of the heat exchange bundle of Figure 1 comprising a peripheral wall in which is formed an opening according to a first embodiment of the invention;

[Fig.3] is a sectional view, along a vertical plane, of the opening of Figure 2 and comprising at least one rib which cooperates with a tube of the heat exchange bundle;

[Fig.4] is a general perspective view of the heat exchange bundle of Figure 1 comprising the peripheral wall in which the opening is formed according to a second embodiment of the invention; [Fig.5] is a close-up view of the opening of Figure 2 covered by the manifold;

[Fig.6] is a sectional view along a vertical plane of the heat exchange bundle at the opening covered by the manifold.

The features, variants and different embodiments of the invention may be associated with each other, in various combinations, as long as they are not incompatible or exclusive to each other. It is in particular possible to imagine variants of the invention 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 or to differentiate the invention from in the state of the prior art. In the figures, the elements common to several figures retain the same reference.

In Figure 1 is illustrated a heat exchanger 1 according to the invention. The heat exchanger 1, for example a charge air cooler, is composed of at least a heat exchange bundle 2, an inlet box 4, an outlet box 6 and d 'at least one collector 8. The heat exchange bundle 2 extends in a main direction of elongation, or longitudinal direction L, and comprises at least one peripheral wall 10 and a plurality of tubes 12. The peripheral wall 10 takes the form of a quadrilateral defined by two longitudinal walls 14 and two side walls 16. More precisely, the peripheral wall 10 comprises a first side wall 16a and a second side wall 16b which extend parallel to one another. 'other and opposite to each other in a transverse direction T perpendicular to the longitudinal direction L of the heat exchange bundle 2, and a first longitudinal wall 14a and a second longitudinal wall 14b which extend parallel to each other, and opposite to each other in a vertical direction V perpendicular to the longitudinal direction L and transverse T of the heat exchange bundle 2, so that they connect the side walls 16. The peripheral wall 10 of the heat exchange bundle 2 defines a housing 18 in which the plurality of tubes 12 extend. more precisely, the housing 18 is defined by an internal face 20 of the peripheral wall 10, and an external face 22 opposite the internal face 20 of the peripheral wall 10 and corresponds to the face of the peripheral wall 10 facing away of the space occupied by the heat exchange bundle 2. The tubes 12 extend into the housing 18 of the heat exchange bundle 2 in the longitudinal direction L of the latter. More precisely, the tubes 12 of the plurality of tubes 12 extend between a first longitudinal end 24 of the heat exchange bundle 2 and a second longitudinal end 26 of the heat exchange bundle 2, opposite the first longitudinal end 24 in the longitudinal direction L of the heat exchange bundle 2. As is partially visible in FIG. 1, the plurality of tubes 12 is arranged in the housing 18 in rows of tubes 12 in the transverse direction T of the heat exchange bundle 2, being spaced from each other, such that a space 28 is provided between each of the tubes 12 of the plurality of tubes 12. The tubes 12 of the plurality of tubes 12, are rolled tubes where result from the joining of two plates.

The inlet box 4 is positioned at the level of the first longitudinal end 24 of the heat exchange bundle 2, while the outlet box 6 is positioned at the level of the second longitudinal end 26 of the heat exchange bundle 2 The inlet box 4 and the outlet box 6 are then each connected to one end of each of the tubes 12 of the plurality of tubes 12, respectively at the first longitudinal end 24 and the second longitudinal end 26 of the bundle. heat exchange 2. Stated otherwise, the plurality of tubes 12 is in fluid communication with the inlet box 4 and the outlet box 6.

The function of the inlet box 4 is then to direct a first fluid, towards the heat exchange bundle 2 and in particular into the plurality of tubes 12. It is then understood that the first fluid, for example an air flow of supercharging of a combustion engine internal, circulates between the inlet box 4 and the outlet box 6, passing through each of the tubes 12 of the plurality of tubes 12 of the heat exchange bundle 2.

In the housing 18, and more precisely in the space 28 formed between the tubes 12, a second fluid circulates. The second fluid may in particular be a heat transfer fluid intended to exchange calories with the first fluid which circulates in the plurality of tubes 12. A first manifold 8a and a second manifold 8b are then arranged respectively on the first longitudinal wall 14a and the second longitudinal. 14b of the peripheral wall 10 of the heat exchange bundle 2. More precisely, the first manifold 8a and the second manifold 8b are positioned overlapping a first opening 30a and a second opening 30b visible in Figures 2 and 4 , in contact with the peripheral wall 10. The openings 30a and 30b are corner zones between the tubes 12 and the collectors 8a and 8b.

These are areas of high mechanical stress, in particular with regard to thermal shock.

In the remainder of the description, only the characteristics of the first manifold 8a and of the first opening 30a will be detailed, but it is understood that these characteristics can be applied mutatis mutandis to the second manifold 8b and to the second opening 30b. Thus, in the remainder of the description, the term collector 8 will be used to group together the first collector 8a and the second collector 8b when the characteristics apply to one or the other of the first collector 8a and of the second collector 8b . Likewise, under the term opening 30, the first opening 30a and the second opening 30b will be grouped together, when the characteristics apply to either the first opening 30a or the second opening 30b.

FIG. 2 illustrates the opening 30 made in one of the longitudinal walls 14 of the peripheral wall 10 of the heat exchange bundle 2. It is understood that the opening 30 is through, that is to say that it is open in the housing 18 of the heat exchange bundle 2.

According to the invention, the opening 30 extends transversely in the longitudinal wall 14 of the peripheral wall 10 relative to the plurality of tubes 12 which extend longitudinally in the housing 18 of the heat exchange bundle 2. Stated otherwise , the opening 30 extends in the longitudinal wall 14 of the peripheral wall 10, perpendicular to the plurality of tubes 12. As mentioned above, the plurality of tubes 12 is arranged in series and transversely in the housing 18 and it is then understood that, advantageously, the opening 30 extends transversely so that it faces each other. tubes 12 of the plurality of tubes 12. In this way, homogeneous irrigation of the second fluid is ensured in the housing 18 and more particularly in the space 28 formed between each of the tubes 12.

The opening 30 is delimited by edges 32 of the longitudinal wall 14. More precisely, a first edge 32a and a second edge 32b both extend in the longitudinal direction L of the heat exchange bundle 2, while that a third edge 32c and a fourth edge 32d extend in the transverse direction T of the heat exchanger 2 and in such a way that they connect the first edge 32a and the second edge 32b. A first distance DI is defined as the distance taken in the longitudinal direction L of the heat exchange bundle 2, over which the first edge 32a extends and a second distance D2 taken in the longitudinal direction L of the heat exchange bundle. heat 2, over which the second border 32b extends. According to the first embodiment of the opening 30, the first distance DI is equal to the second distance D2.

According to one characteristic of the invention, at least one rib 34 extends in the opening 30. According to the example of the invention illustrated, a plurality of ribs 34 extends in the opening 30 in the longitudinal direction L of the heat exchange bundle 2. It is therefore understood that each of the ribs 34 extends in the opening 30 between the third edge 32c and the fourth edge 32d of said opening 30. The rib or ribs 34 are portions of the peripheral wall 10, and form strips which pass through the opening, from one longitudinal edge to the other. Each of the ribs 34 of the plurality of ribs 34 is then spaced from an adjacent rib 34, such that the particular arrangement of the ribs 34 in the opening 30 forms slits 36. It is therefore understood that the second fluid passes through it. opening 30 at the level of the slots 36 formed in the latter by the plurality of ribs 34.

According to one characteristic of the invention, particularly visible in Figure 3, showing a sectional view of the opening 30 along a first vertical plane AA visible in Figure 2, at least one rib 34 extends in the opening 30 in line with one of the tubes 12 of the plurality of tubes 12. In the example illustrated, each of the ribs 34 of the plurality of ribs 34 extends in line with one of the tubes 12 of the plurality of tubes 12. The rib 34 then has the function of protecting the tube 12 during the use of the heat exchanger 2, that is to say during the circulation of the first fluid and in particular of the second fluid. It is therefore understood that advantageously, there are as many ribs 34 formed in the opening 30 as there are tubes 12 which extend into the housing 18 of the heat exchange bundle 2.

Still according to the invention, at least one section of rib 34 is of complementary shape to a portion of one of the tubes 12 of the plurality of tubes 12. Stated otherwise, the rib 34 is provided so that it can cooperate with a section of the tube 12. The rib 34 is thus guaranteed to remain in line with the tube 12 when using the heat exchanger 2, that is to say when the second fluid passes through the opening. 30.

According to a second embodiment of the opening 30 visible in Figure 4, the second distance D2 from the second edge 32b is strictly less than the first distance DI from the first edge 32a. It will therefore be understood that the opening 30 formed in the longitudinal wall 14 extends from the second edge 32b so that the third edge 32c and the fourth edge 32d are more and more distant from each other as the approach of the first edge 32a of the opening 30. Thus, each of the ribs 34 formed in the opening 30 extends in the longitudinal direction L of the heat exchange bundle 2, over an increasing distance that it approaches the first edge 32a of the opening 30.

This characteristic is taken advantage of during the use of the heat exchanger, when the entry of the second fluid into the housing 18 takes place at the level of the second edge 32b of the opening 30. Indeed, it is understood that during the distribution of the second fluid in the housing 18, the flow rate of the second fluid in the chamber 38 of the manifold 8 is greater at the level of the second edge 32b compared to the flow rate of the second fluid when it arrives at the level of the first edge 32a, part of it having already passed through the opening 30. It is therefore understood that the longitudinal distance over which the opening 30 extends is inversely proportional to the flow rate of the second fluid in the chamber 38 of the manifold 8.

Thus, the enlargement of the opening 30 from the second edge 32b to the first edge 32a has the effect of better distributing the second fluid in the housing 18 of the heat exchange bundle 2, by reducing the volume of a room 38 delimited by the manifold 8 where the flow of the second fluid is greater and by enlarging the volume of the chamber 38 of the manifold 8 where the flow of the second fluid is lower.

The collector 8 will now be described in cooperation with Figures 1, 5 and 6, the latter illustrating a sectional view of the heat exchange bundle 2 at the opening 30, along a second vertical plane BB visible at the figure 5.

The manifold 8 according to the invention comprises at least one chamber 38 and a peripheral edge 40, and is arranged to cover the opening 30 mentioned above. The function of the collector 8 is then to distribute or evacuate as a second fluid the housing 18 of the heat exchange bundle 2. An inlet end 42 and an outlet end 44 of the collector 8 are then defined, opposite the. one to the other on the collector 8, along the transverse direction T of the heat exchange bundle 2.

According to the example illustrated and visible in FIG. 6, an inlet orifice 46 is provided at the level of the first end 42 of the manifold 8 and a circulation pipe 48 is secured around the inlet orifice 46. It is understood therefore that the manifold 8 and the circulation pipe 48 are in fluid communication with one another.

Alternatively, an outlet orifice can be made at the level of the second end 44 of the manifold 8 so that the circulation pipe 48 is secured around said outlet orifice.

The chamber 38 of the manifold 8 is delimited by a chamber wall 50 of curved shape and which gives the chamber 38 a section of concave shape. The peripheral edge 40 then extends from a free edge 52 of the chamber wall 50 and in such a way that the peripheral edge 40 surrounds a window 54 of the chamber 38 of the manifold 8. It is understood by window 54 that the latter This opens the collector 8 onto a volume outside the volume defined by the chamber 38 of said collector 8. According to the invention, the collector 8 is arranged to cover the opening 30 so that the window 54 of the chamber 38 is at the bottom. right of the opening 30 and that the peripheral edge 40 comes into contact with a part of the outer face 22 of the peripheral wall 10 of the heat exchange bundle 2. In other words, the window 54 is disposed opposite the opening 30, such that chamber 38 and housing 18 are in fluid communication with one another.

More precisely, an alignment axis XI is defined, visible in FIG. 5, on which the chamber 38 of the manifold 8 and the opening 30 are aligned. A window width is defined. L1 as the width of the window 54 taken along a straight line perpendicular to the alignment axis XI and parallel to the longitudinal direction L of the heat exchange bundle 2, and a width of the opening L2 is defined as the width of the opening 30 taken along a straight line perpendicular to the alignment axis XI and parallel to the longitudinal direction L of the heat exchange bundle 2. The width of the window L1 is then strictly greater than the width opening L2. It is therefore understood that the peripheral edge 40 does not extend opposite the opening 30 formed on the peripheral wall 10. In other words, during the operation of the heat exchanger, the peripheral edge 40 of the manifold 8 is not not in interaction with the second fluid circulating between the manifold 8 and the housing 18.

The peripheral edge 10 extends parallel to the longitudinal wall 14 of the peripheral wall 10, so that it is in continuous contact with the latter. A continuous seal is thus ensured between the peripheral edge 40 and the peripheral wall 10, and the leakage of second fluid outside the manifold 8 and the housing 18. According to a non-limiting example of the invention, the peripheral edge 40 is avoided. and the peripheral wall 10 are brazed with one another in such a way that optimum fixing and sealing of the peripheral edge 40 with the peripheral wall 10 is ensured.

As is particularly visible in FIG. 1, the chamber 38 of the collector 8 has a plane of symmetry S. A first height H1 of the collector 8 is then defined, taken at the level of the first end 42 of the collector 8 along the plane of the symmetry S, and a second height H2 of the collector 8 taken at the level of the second end 44 of the collector 8. According to the invention, the first height H1 is greater than the second height

H2.

Advantage is taken of such a characteristic, in that it makes it possible to direct the second fluid and to concentrate it at the level of the second end 44 of the manifold 8. More precisely, when the second fluid enters the chamber 38 of the manifold 8. manifold 8 via the circulation pipe 48 formed at the level of the first end 42, it will be understood that its flow rate is higher at the level of the first end 42 than at the level of the second end 44 of the manifold 8. Thus, by gradually decreasing the height of the manifold 8, and therefore of the chamber 38 from the first end 42 to the second end 44, the volume of the chamber 38 is reduced and a constant second fluid flow rate is thus maintained throughout said chamber 38. This allows a distribution in second homogeneous fluid throughout the housing 18 of the heat exchange bundle

2.

As mentioned above, the first opening 30a is formed in the first longitudinal wall 14a and the second opening 30b is formed in the second longitudinal wall 14b of the peripheral wall 10. More precisely, the first opening 30a is formed. at the level of the first longitudinal end 24 and the second opening 30b is formed at the level of the second longitudinal end 26 of the heat exchange bundle 2. The first manifold 30a is then defined as the inlet manifold for the second fluid in the heat exchange bundle 2 and the second manifold 30b as the outlet collector of the second fluid from the heat exchange bundle 2.

During the operation of the heat exchanger 1, the second fluid arrives in the chamber 38 of the inlet manifold 30a by means of the circulation pipe 48, then passes through the first opening 30a opposite which is arranged the window 54 of the chamber 38 of the inlet manifold 30a, then passes through the housing 18 and in particular the space 28 formed between each of the tubes 12 to then be collected in the chamber 38 of the outlet manifold 30b and to be evacuated outside the heat exchanger heat 1 by means of the circulation line 48 of the outlet manifold 30b.

It is then understood that the circulation of the second fluid as has just been described allows the latter to exchange calories with the first fluid which circulates between the inlet box 4 and the outlet box 6, in the plurality of tubes 12 of the heat exchange bundle 2.

The invention achieves the goal it had set itself by devising a simple means of reducing the problems of breaks between the collector and the heat exchange bundle by proposing a collector attached to the heat exchange bundle comprising a peripheral edge secured to said heat exchange bundle.

The invention cannot however be limited to the means and configurations exclusively described and illustrated, and also applies to any means or configurations, equivalents and to any combination of such means or configurations.

Claims

1. Heat exchanger (1) comprising at least a heat exchange bundle (2), a box (4, 6) and a manifold (8), the box (4, 6) being disposed at one end (24 , 26) of the heat exchange bundle (2), the heat exchange bundle (2) comprising at least one peripheral wall (10) which delimits a housing (18) in which extends a plurality of tubes ( 12) within which circulates a first fluid and around which circulates a second fluid, at least one opening (30) being provided on the peripheral wall (10), the heat exchanger (1) being characterized in that the manifold ( 8) is attached to the peripheral wall (10), the collector (8) at least partially delimiting a chamber (38) and comprising a peripheral edge (40) which surrounds a window (54) of the collector (8), the collector ( 8) being arranged to cover the opening (30) made in the peripheral wall (10) so that the window (54) is at least partially in line with of the opening (30) and that the peripheral edge (40) is at least partially in contact with said peripheral wall (10).

2. Heat exchanger (1) according to the preceding claim, wherein the peripheral wall (10) of the heat exchange bundle (2) comprises an internal face (20) facing the housing (18) and an external face ( 22) facing an environment outside the heat exchange bundle (2), the peripheral edge (10) of the collector (8) being in contact with the external face (22) of the peripheral wall

(10).

3. Heat exchanger (1) according to any one of the preceding claims, wherein the plurality of tubes (12) extend longitudinally in the housing (18) delimited by the peripheral wall (10), the opening (30). ) being arranged transversely to the plurality of tubes (12).

4. Heat exchanger (1) according to any one of the preceding claims, wherein the window (54) of the manifold (8) and the opening (30) formed in the peripheral wall (10) are aligned on the same axis. transverse (X1) and a width of the window (L1) being greater than a width of the opening (L2).

5. Heat exchanger (1) according to any one of the preceding claims, wherein the chamber (38) has a first end (42) of the manifold (8) which extends over a first height (Hl) measured along a plane of symmetry (S) of the chamber (38) and a second end (44) of the collector (8) which extends over a second height (H2) measured along the plane of symmetry (S), the first height (Hl) being greater than the second height (H2).

6. Heat exchanger (1) according to any one of the preceding claims, wherein the opening (30) comprises a first edge (32a) which extends in the longitudinal direction (L) of the heat exchange bundle. (2) over a first distance (D1) and a second edge (32b) which extends in the longitudinal direction (L) of the heat exchange bundle (2) over a second distance (D2), the second distance ( D2) being equal to the first distance (D1).

7. Heat exchanger (1) according to any one of claims 1 to 5, wherein the opening (30) comprises a first edge (32a) which extends in the longitudinal direction (L) of the exchange bundle. heat (2) over a first distance (Dl) and a second edge (32b) which extends in the longitudinal direction (L) of the heat exchange bundle (1) over a second distance (D2), the second distance (D2) being strictly less than the first distance (D1).

8. A heat exchanger (1) according to any preceding claim, wherein at least one rib (34) extends into the opening (30).

9. Heat exchanger (1) according to the preceding claim, wherein the at least one rib (34) is formed in line with at least one of the tubes (12) of the plurality of tubes (12) of the exchange bundle. heat (2).

10. Heat exchanger (1) according to any one of the preceding claims, wherein the peripheral edge (40) and the peripheral wall (10) are secured together by brazing.