KR102295272B1 - Heat exchanger and method of manufacturing same - Google Patents

Abstract

The invention relates to a heat exchanger (1) for an exhaust gas recirculation system:
- an exchanger body (3) delimiting the interior volume;
- longitudinal tubes (7) accommodated in said interior volume and assembled between the upper and lower planes (P1, P2) to form a layer of tubes, said tubes being passageways for circulating a second fluid longitudinal tubes (7) separated by (19), the upper plane being opposite the upper part (27) of the exchanger body;
- a second fluid inlet (31) arranged in the upper part of the exchanger body (3); and
- a deflector (39) for guiding a second fluid in the interior volume (35), at least partially closing the interstitial space (29) between the upper part (27) and the upper plane (P1) member (35) comprising
It relates to a heat exchanger (1) for an exhaust gas recirculation system comprising:

Description

HEAT EXCHANGER AND METHOD OF MANUFACTURING SAME

The present invention relates generally to a heat exchanger, in particular for an automobile exhaust line.

Such exchangers may include an exchanger body delimiting an interior volume and a plurality of longitudinal tubes accommodated within the interior volume, which are provided for circulation of a first fluid, eg of exhaust gas. A second fluid, for example a coolant, circulates within the exchanger body, around the tubes, from the inlet to the outlet.

A persistent problem with this type of exchanger is preventing the secondary fluid from following the shortest path from the inlet to the outlet. If most of the second fluid follows this short-circuit path, some areas of the tubes may be poorly cooled.

Inserting two comb-shaped members, oriented in opposite directions, around the tubes to form a baffle that forces the second fluid to take an S-shaped movement from the inlet to the outlet. , is known.

Such an arrangement makes it possible to achieve good quality heat exchange between the two fluids, but is mechanically complex.
[Prior art literature]
Patent Document 1: Japanese Patent Laid-Open No. 2014-194296

In this context, the present invention aims to propose a heat exchanger that makes it possible to achieve good quality heat exchange between two fluids, but is less mechanically complex.

For that purpose, according to a first aspect, the invention provides a heat exchanger for an exhaust gas recirculation system comprising: an exchanger body delimiting an interior volume; a plurality of longitudinal tubes accommodated within the interior volume and provided for circulating a first fluid, at least some of the tubes being transversely juxtaposed and assembled between the upper and lower planes of the tube forming a layer of, wherein the tubes of the layer of tubes are separated from each other by passages for circulating a second fluid, wherein at least the upper plane comprises a longitudinal direction and a transverse direction, the upper plane comprising: a plurality of longitudinal tubes directly opposite the upper portion of the exchanger body and separated from the exchanger body by an interstitial space; a second fluid inlet exiting the interior volume, arranged in the upper portion of the exchanger body; and a guiding member for guiding a second fluid within the interior volume, the deflector having a transverse section at least partially closing the interstitial space between the upper portion and the upper plane. A heat exchanger for an exhaust gas recirculation system comprising a guide member.

The deflector prevents the second fluid from taking a substantially longitudinal flow at the inlet portion of the second fluid inlet. The deflector deflects the second fluid in the depth direction in the passageways, which contributes to achieving a satisfactory quality of heat exchange between the fluids.

The heat exchanger may also have one or more of the following characteristic configurations, considered individually or according to any technically possible combination(s):

- said guide member comprises a grid for dispensing a second fluid, arranged in said interstitial space between said upper plane and said upper part, opposite said second fluid inlet;

- said deflector of said guide member has teeth engaging in said passages;

- the distribution mesh, the transverse section and the teeth are integral to one another;

- said distribution network, said cross section and said teeth are formed in the same metal plate;

- said distribution network extending over substantially the entire width of said layer of tubes and having, opposite each passageway, at least one aperture, said second fluid inlet comprising at least one of said passageways; disposed opposite the central passage, the at least one aperture having a passage cross-section that increases transversely from the at least one central passage;

- each tooth extends transversely over the entire width of the corresponding passage;

- each passage extends over a determined height along a height direction substantially perpendicular to the longitudinal and transverse directions, the corresponding teeth extending over a height comprised between 5% and 50% of the determined height;

- at least one of the two tubes surrounding the passage has a rib, projecting into the passage, extending the tooth in height direction, said rib preferably having interruptions;

According to a second aspect, the present invention provides a method for manufacturing a heat exchanger having the above features, comprising: forming a guide member for guiding a second fluid by cutting and shaping a metal plate; disposing the longitudinal tubes and the guide member within the exchanger body; A method of manufacturing a heat exchanger comprising the step of fastening longitudinal tubes, a guide member and an exchanger body to each other.

Other features and advantages of the present invention will emerge from the detailed description given below, by way of indication and without limitation, with reference to the accompanying drawings:
1 is a simplified schematic diagram of a heat exchanger according to the invention;
FIG. 2 is a partial perspective view of the heat exchanger of FIG. 1 , in which the body is shown transparently so that the tubes and a guide member for guiding the second fluid are visible;
FIG. 3 is a cross-sectional view of the heat exchanger of FIG. 2 in a plane perpendicular to the longitudinal direction, considered according to the projection of arrow III;
FIG. 4 is a partial perspective view of the heat exchanger of FIG. 2 , in which the body is shown transparently so that the tubes and a guide member for guiding the second fluid are visible;
FIG. 5 is a perspective view of a guide member for guiding the second fluid of FIG. 2 ;
6 shows a plate from which a guide element for guiding the second fluid is manufactured;
7 shows the state of the plate of FIG. 6 after the cutting operation and before the forming operation; and
FIG. 8 is an elevational view of the section of the tube delimiting one of the second fluid passages, showing the ribs extending the teeth engaging in the passage;

The heat exchanger 1 shown in FIG. 1 is intended to be inserted into a vehicle exhaust line, in particular of a motor vehicle, such as a passenger car or truck.

This heat exchanger is inserted on the EGR (exhaust gas recirculation) line, which makes it possible, for example, to recirculate a part of the exhaust gas towards the inlet of the combustion chamber of the engine to be mixed with fresh air.

In a variant, the heat exchanger is integrated into an EHRS (exhaust heat recovery system) device or into any other system of the exhaust line.

According to another variant, the heat exchanger is integrated into another circuit of the vehicle or even into a static system not mounted on the vehicle.

A heat exchanger 1 is provided for placing the first fluid and the second fluid in thermal contact.

The first fluid is, for example, an exhaust gas of a vehicle, and the second fluid is a heat transfer fluid intended to cool the exhaust gas. The second fluid is, for example, a liquid, such as water, with potential additives.

In a variant, both fluids are of any other type.

The heat exchanger 1 comprises an exchanger body 3 delimiting an interior volume 5 and a plurality of longitudinal tubes 7 accommodated in the interior volume 5 ( FIGS. 2 and 3 ).

Tubes 7 are provided for circulating the first fluid.

The exchanger body 3 has, together with its longitudinal central axis, a tubular wall 9 . In the example shown, the tubular wall 9 is a cylinder with a substantially rectangular straight cross-section.

The tubes 7 are generally all the same. They are straight, having a substantially rectangular cross-section. These are parallel to each other.

Each tube 7 , considered in cross-section in a plane perpendicular to the longitudinal direction, is thus delimited by two opposing sides 11 , an upper surface 13 and a lower surface 15 which oppose each other. The upper surface 13 and the lower surface 15 connect the side surfaces 11 to each other.

The sides 11 are substantially planar and perpendicular to the transverse direction. The transverse direction is perpendicular to the longitudinal direction.

At least a part of the tubes 7 forms a layer of tubes which are laterally adjacent and are assembled between the upper plane P1 and the lower plane P2 ( FIG. 3 ). The tubes 7 of the layer are separated from each other by circulation passages 19 for the second fluid.

In the example shown, the tubes 7 are all laid side by side in a single layer.

The tubes 7 are arranged so that their sides 11 lie opposite each other. Each passage 19 is thus bounded by the sides 11 of two adjacent tubes in the layer.

The layer generally comprises a number of, for example at least five tubes.

Each tube 7 has a large height when considered in the height direction compared to its width when considered in the transverse direction. The height direction E is substantially perpendicular to the longitudinal direction L and the transverse direction T. These directions are indicated by arrows in FIGS. 2 and 3 .

The tubes 7 extend over substantially the entire longitudinal length of the tubular wall 9 .

The exchanger body 3 comprises two end plates 21 , which engage two opposite longitudinal ends of the tubular wall 9 ( FIGS. 2 to 4 ). The tubular wall 9 has, at each of its longitudinal ends, an edge with a closed contour 23 , which is sealingly fixed to a corresponding end plate 21 .

Each end plate 21 is provided with a plurality of longitudinal orifices 25, which are arranged transversely side by side. Each tube 7 has a longitudinal end, sealingly fixed to the peripheral edge of one of the longitudinal orifices of one of the two plates, the opposite longitudinal end of which is 2 It is sealingly secured to the peripheral edge of one of the longitudinal orifices of the other of the plates (FIG. 4).

The inner volume 5 provided for circulation of the second fluid is thus delimited by the tubular wall 9 and the end plates 21 .

The upper plane P1 generally corresponds to a plane, including the longitudinal and transverse directions, which is tangent to at least one of the tubes 7 in the middle without intersecting the other tubes. This is shown in FIG. 3 . It abuts the upper surface 13 of the at least one tube 7 . In the example shown, the upper surfaces 13 of the tubes 7 are fitted to the upper plane P1 .

The lower plane P2 is also generally a plane, including longitudinal and transverse, tangent to at least one of the middle tubes 7 , not intersecting the other tubes. This is shown in FIG. 3 . It abuts the lower surface 15 of the at least one tube 7 . In the example shown, the lower surfaces 15 of the tubes 7 are fitted to the lower plane P2 .

The upper plane P1 lies directly opposite the upper part 27 of the exchanger body 3 and is separated from the upper part by an interstitial space 29 .

The interstitial space 29 generally extends over the entire transverse width of the layer of tubes and over the entire longitudinal length of the layer of tubes. This constitutes a preferred leak path for the second fluid.

A second fluid inlet 31 opening into the interior volume 5 is arranged in the upper part 27 of the exchanger body 3 ( FIG. 1 ).

A second fluid outlet 33 opening into the interior volume 5 is also arranged in the exchanger body 3 .

1 , the second fluid inlet 31 is arranged on a first longitudinal half of the exchanger body 3 , the second fluid outlet 33 is opposite the first longitudinal half on the second longitudinal half of the exchanger body 3 of

The heat exchanger 1 is a guide member 35 for guiding a second fluid in the interior volume 5 , comprising:

a mesh (37) for dispensing a second fluid, opposite the second fluid inlet (31), arranged in the interstitial space (29) between the upper part (27) and the upper plane (P1);

a transverse section (41) at least partially closing the interstitial space (29) between the upper part (27) and the upper plane (P1), and teeth (43) engaging in passages (19), Deflector(39)

It further comprises a guide member (35), which comprises a.

Such a guide element is shown in particular in FIG. 5 .

This directs the second fluid circulating in the interior volume 5 from the second fluid inlet 31 to the second fluid outlet 33 to improve the distribution of the second fluid within the passageways 19 . provided to guide you.

The distribution mesh 37 , the transverse section 41 and the teeth 43 are integral to one another.

More specifically, the distribution mesh 37 , the cross section 41 and the teeth 43 are formed in the same metal plate 49 , as shown in FIGS. 5 to 7 .

The distribution network 37 is a planar region of the metal plate 49 , extending generally in the longitudinal and transverse planes, for example in the upper plane P1 . It extends over the entire width of the layer of tubes. It is generally arranged on the upper surfaces 13 of the tubes 7 and is rigidly fixed to the tubes 7 .

The distribution mesh 37 has at least one aperture 51 opposite each passage 19 ( FIG. 4 ). Generally, it has a single aperture 51 opposite each passageway 19 . The apertures 51 are thus aligned transversely.

The second fluid inlet 31 is arranged, among the passages 19 , opposite the at least one central passage, indicated here by reference numeral 53 .

In the example shown, two so-called central passages 53 are located opposite the inlet 31 , as shown in FIG. 3 .

The inlet 31 lies, in the transverse direction, substantially at the center of the layer of tubes.

The at least one aperture 51 has a passage cross-section, which increases transversely from the at least one central passage 53 .

The passage cross-section considered is the total cross-section, which is provided collectively for the second fluid by the aperture(s) 51 associated with the second fluid passage 19 .

This means that the passage cross-section provided for the second fluid is relatively small for the aperture(s) 51 associated with the central passages 53 . The passage cross-section provided for the second fluid is slightly larger for the aperture(s) 51 associated with the two second fluid passageways 19 adjacent to the central passageways 53 . The passage cross-section of the holes progressively increases as they move laterally away from the central passages.

Such an arrangement makes it possible for the second fluid arriving through the inlet 31 to be evenly distributed in the passageways 19 .

The transverse region 41 is defined by a solid part of the plate 49 . It comprises two flaps 55 , 57 of the same shape, pressed against each other. The two flaps 55 , 57 exactly overlap each other, as shown in FIG. 5 .

The flaps 55 , 57 are connected to each other by a transversely oriented, upper bend line 59 of the plate 49 . The flap 55 is connected to the transverse edge of the mesh 37 by a transversely oriented, lower bend line 61 ( FIG. 7 ).

The teeth 43 are fastened to the transverse edge 63 of the flap 57 , opposite the upper bend line 59 .

The flaps 55 , 57 extend in a plane including a height direction and a transverse direction. They are substantially perpendicular to the distribution network 37 .

The transverse section 41 occludes at least 90% of the cross-section of the interstitial space 29 , preferably at least 95% of the cross-section, even more preferably at least 98% of the cross-section.

As shown in FIG. 3 , the cross section 41 is fitted to the determined transverse plane. The interstitial space 29 has an inner section determined in said transverse plane. The outer section of the transverse section 41 is conjugated with the inner section of the interstitial space 29 in said plane.

The second fluid inlet 31 is arranged on a boss 65 formed in the exchanger body 3 ( FIGS. 2 and 3 ).

This boss portion 65 is convex toward the outside of the exchanger body 3 . The inlet 31 is formed at the apex of the boss part 65 .

The transverse section 41 generally conforms to a transverse plane intersecting the boss portion 65 . The transverse section thus has the shape of a truncated pyramid, as shown in FIG. 3 .

The upper bending line 59 constitutes the upper edge of the transverse section 41 and is directed towards the upper part 27 of the exchanger body 3 . It is transversely shorter than the lower bend line 61 and the transverse edge 63 .

The upper bend line 59 is connected to the lower bend line 61 by the beveled edges 67 of the flap 55 . It is connected to the transverse edge 63 by the beveled edges 69 of the flap 57 , which overlap precisely on the inclined edges 67 .

The transverse section 41 is inserted longitudinally between the second fluid inlet 31 and the second fluid outlet 33 .

All of the teeth 43 are attached to the transverse section 41 .

They emerge from the transverse edge 63 of the flap 57 . They are regularly spaced along the transverse edge 63 .

Each second fluid circulation passage 19 receives one of the teeth 43 .

According to one embodiment variant, not shown, one of the teeth 43 is inserted between the exchanger body 3 and the tube 7 located at the first transverse end of the layer. Another one of the teeth 43 is inserted between the exchanger body 3 and the tube 7 which is located at the second transverse end of the layer.

Each tooth 43 extends transversely over the entire width of the corresponding passage 19 .

The teeth 43 have a free segment 71 oriented along the height direction, and an intermediate segment 73 oriented to connect the free segment 71 substantially longitudinally to the transverse section 41 , e.g. For example, it is L-shaped.

Each passage 19 extends over a height determined in the height direction. Corresponding teeth 43 over a height between 5% and 50% of the determined height, preferably over a height between 10% and 30% of the determined height, even more preferably 10% of the determined height over a height of between 20% and 20%.

Preferably, at least one of the two tubes 7 surrounding the passage 19 has a rib 75 protruding into the passage 19, extending the teeth 43 in the height direction. be prepared The rib 75 is particularly visible in FIG. 8 . It is formed on the side 11 of the tube.

In general, the two tubes 7 surrounding the passage 19 each have ribs 75 projecting into the passage 19 . These ribs are substantially identical.

Each rib 75 generally extends at least from the upper surface 13 , considered in the height direction E, over at least 50% of the height of the tube 7 .

In the example shown in FIG. 4 , the ribs 75 are, first, from the upper surface 13 , along the height direction, then along the oblique direction oriented longitudinally towards the end plate 21 , and then along the lower surface 15 . ) along the height direction toward the

The two ribs 75 are disposed to face each other along the transverse direction. Together they close the passage 19 , substantially over its entire transverse width. For that purpose, each rib 75 projects with respect to the side 11 of the corresponding tube 7 over a height such that it actually touches the rib 75 opposite it.

The rib 75 preferably has generally regularly spaced stops 77 . This makes it possible to create a flow of the second fluid in the passage directly behind the ribs 75 , which makes it possible to obtain a more uniform temperature field along the tube.

8 shows that each tube 7 has reliefs 79 in the form of pads, formed by deformation of the sidewall 11 of the tube. These relaxations are spacers, which make it possible to ensure a separation between the tubes 7 and thus the width of the passage 19 .

The operation of the heat exchanger will now be described.

The first fluid passes through the heat exchanger by way of the longitudinal ends of the tubes 7 . The first fluid circulates along the tubes 7 and exits the heat exchanger at the other longitudinal end of the tubes 7 .

The second fluid passes through the heat exchanger through the second fluid inlet 31 . The second fluid flows within the interior volume 5 .

The second fluid exiting the inlet 31 is identified in the interstitial space 29 . The second fluid cannot flow longitudinally along the interstitial space 29 towards the outlet 33 , due to the presence of the transverse zone.

Accordingly, the second fluid is forced through the distribution network 37 , and penetrates inside the circulation passages 19 .

The aperture(s) 51 covering the central passageway(s) 53, located opposite the inlet 31 , are relatively smaller and provide a relatively greater resistance to the flow of fluid. In contrast, the aperture(s) 51 covering the passageway(s) 19 biased transverse to the inlet 31 are relatively larger and provide a relatively weaker resistance to the flow of the fluid.

As a result, the second fluid is distributed substantially uniformly within the different passages 19 , which accommodate respective fluid flow rates proximate to each other.

The teeth 43 prevent the second fluid from circulating substantially longitudinally in the region which is to be located directly below the interstitial space 29 in the same passageway 19 .

The teeth 43 deflect the second fluid toward the underside of the tube in the depth direction in the passageway 19 .

The ribs 75 extend this movement and deflect the second fluid in a direction opposite to the interstitial space 29 , in a direction more and more deeply in the passageways 19 . A second fluid at a low flow rate passes through the stops 77 .

When the second fluid reaches the ends of the ribs 75 , the second fluid flows longitudinally towards the second fluid outlet 33 .

The invention also relates to a method for manufacturing a heat exchanger 1 having the above features.

The manufacturing method comprises the following steps:

forming the guide member 35 of the second fluid by cutting and shaping the metal plate;

disposing the longitudinal tubes (7) and the guide member (35) in the exchanger body (3);

fastening the longitudinal tubes (7), the guide member (35) and the exchanger body (3) together.

A metal plate 49 from which a guide member is fabricated is shown in FIG. 6 .

The metal plate is generally planar and has a thickness of between 0.2 and 1 mm, advantageously between 0.3 and 0.8 mm, and even more advantageously of 0.4 mm. The metal plate is made of steel, preferably of austenitic steel.

The cutting and forming step involves cutting the plate 49 to delimit the contour of the distribution mesh and to create holes 51 .

The cut also makes it possible to create beveled edges 67 , 69 and teeth 43 .

The state of the plate 49 after the cutting operation is shown in FIG. 7 .

The cutting and forming step includes a forming operation, during which the plate 49 is bent at substantially 90 degrees about the lower bend line 61 and 180 degrees about the upper bend line 59 .

The forming operation also makes it possible to form the teeth 43 .

The forming operation is performed simultaneously with or after the cutting operation.

The bending and forming steps are, for example, stamping steps.

The fastening of the longitudinal tubes 7 , the guide member 35 and the exchanger body 3 to each other is effected, generally in a furnace, by brazing.

In this description, reference has been made to upper and lower surfaces or upward and downward directions. The top surface and the upward direction are not necessarily upward oriented and may be oriented in any direction. The same remarks apply to the lower surface and downward direction.

The heat exchanger may have a plurality of modifications.

According to one variant, the tubes are arranged in several layers, overlapping each other in height direction.

The two ribs, which project into the second fluid circulation passageway, arranged opposite each other, may be replaced by a single rib, which is held by one of the two tubes.

The exchanger body and tubes have any suitable shapes.

The inlet is not necessarily formed on the boss portion. In a variant, the inlet is formed in a region that does not protrude on the exchanger body.

The present invention has a plurality of advantages.

The guide element is particularly easy and inexpensive to manufacture, since the distribution mesh, the cross section and the teeth are formed in the same metal plate.

The fact that the cross-section closes at least 90% of the cross-section of the interstitial space contributes to achieving a good distribution of the second fluid within the internal volume of the exchanger body, due to the absence of a short-circuit path from the inlet to the outlet .

The fact that the transverse section is inserted between the second fluid inlet and the second fluid outlet in the longitudinal direction also contributes to a good distribution of the second fluid.

When the second fluid inlet is arranged on a boss formed in the exchanger body, the distribution of the second fluid from the inlet becomes easier. The transverse zone blocks the circulation of the fluid in the longitudinal direction in the interstitial space as close as possible to the inlet.

The teeth block the longitudinal fluid circulation in the upper part of the passageways, just below the interstitial space. Forming ribs on the tubes in such a place is impossible, as these ribs may be too close to the junction edge between the side and top surfaces of the tubes.

The use of protruding ribs formed in the tubes on the extension of the teeth makes it possible to deflect the second fluid conveniently. Such ribs are inexpensive to manufacture and easy to implement.

Claims (10)

As a heat exchanger (1) for an exhaust gas recirculation system:
- an exchanger body (3) delimiting the interior volume (5);
- a plurality of longitudinal tubes (7) accommodated in said interior volume (5) and provided for circulating a first fluid, some of said longitudinal tubes (7) lying transversely side by side and assembled between the upper and lower planes P1, P2 to form a layer of tubes, the tubes of the layer of tubes being separated from each other by passages 19 for circulating a second fluid, said The upper plane P1 comprises a longitudinal direction and a transverse direction, said upper plane P1 lying directly opposite the upper part 27 of the exchanger body 3 and by means of an interstitial space 29 . a plurality of longitudinal tubes (7), which are separated from the upper part;
- a second fluid inlet (31), arranged in the upper part (27) of the exchanger body (3), opening into the inner volume (5); and
- a guiding element (35) for guiding a second fluid in the inner volume (5), a transverse section partially closing the interstitial space (29) between the upper part (27) and the upper plane (P1) guide member (35), comprising a deflector (39) with (41)
including,
Said transverse section (41) comprises two flaps (55, 57),
The heat exchanger (1) further comprises a distribution mesh (37) connected to the transverse edge of one flap (55) and teeth (43) fixed to the transverse edge (63) of the other flap (57). the heat exchanger. The method of claim 1,
The guide member 35 dispenses a second fluid, which is arranged in the interstitial space 29 between the upper part 27 and the upper plane P1 opposite the second fluid inlet 31 . and a distribution network (37) for As a heat exchanger (1) for an exhaust gas recirculation system:
- an exchanger body (3) delimiting the interior volume (5);
- a plurality of longitudinal tubes (7) accommodated in said interior volume (5) and provided for circulating a first fluid, some of said longitudinal tubes (7) lying transversely side by side and assembled between the upper and lower planes P1, P2 to form a layer of tubes, the tubes of the layer of tubes being separated from each other by passages 19 for circulating a second fluid, said The upper plane P1 comprises a longitudinal direction and a transverse direction, said upper plane P1 lying directly opposite the upper part 27 of the exchanger body 3 and by means of an interstitial space 29 . a plurality of longitudinal tubes (7), which are separated from the upper part;
- a second fluid inlet (31), arranged in the upper part (27) of the exchanger body (3), opening into the inner volume (5); and
- a guiding element (35) for guiding a second fluid in the inner volume (5), a transverse section partially closing the interstitial space (29) between the upper part (27) and the upper plane (P1) guide member (35), comprising a deflector (39) with (41)
including,
The guide member 35 dispenses a second fluid, which is arranged in the interstitial space 29 between the upper part 27 and the upper plane P1 opposite the second fluid inlet 31 . and a distribution network 37 for
The distribution network (37) extends over the entire width of the layer of tubes and, opposite each passageway (19), has at least one aperture (51), the second fluid inlet (31) is disposed opposite the central passage 53 of at least one of the passages 19, and the cross-sectional area of the at least one hole 51 increases toward both ends in the transverse direction from the center. energy. 4. The method of claim 2 or 3,
The deflector of the guide member (35) has teeth (43) which engage in the passages (19). 5. The method of claim 4,
The distribution network (37), the transverse section (41) and the teeth (43) are integral with each other. 5. The method of claim 4,
The distribution network (37), the cross section (41) and the teeth (43) are formed in the same metal plate (49). 5. The method of claim 4,
each tooth (43) extends transversely over a width equal to the width of the corresponding passage (19). 5. The method of claim 4,
Each passage 19 extends a predetermined length in a direction perpendicular to the upper plane P1, and a corresponding tooth 43 spans a length comprised between 5% and 50% of the predetermined length. The one that extends, the heat exchanger. 9. The method of claim 8,
At least one of the two tubes 7 surrounding the passage 19 has a rib 75 protruding into the passage 19 , the rib 75 oriented perpendicular to the upper plane P1 . is an extension of the teeth (43), and the rib (75) has stops (77). 4. A method for manufacturing a heat exchanger according to any one of claims 1 to 3, comprising:
- forming the guiding member 35 of the second fluid by cutting and shaping the metal plate 49 ;
- placing the longitudinal tubes (7) and the guide element (35) in the exchanger body (3);
- fastening together the longitudinal tubes (7), the guide member (35) and the exchanger body (3)
A method of manufacturing a heat exchanger comprising a.

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