JP2020133636A - Heat exchanger - Google Patents

Abstract

To propose a heat exchanger in which circulation of a cooling medium is controlled appropriately.SOLUTION: A heat exchanger (1) comprises at least one internal grid (33) that is arranged between a second fluid inlet (7) and a second fluid outlet (9), and divides an internal space (6) into a plurality of chambers (35, 39, 37) arranged one after another in a longitudinal direction. The internal grid (33) defines a passage (45) for second fluid together with the inner surface of an envelope (5), and each passage (45) is arranged so that the second fluid circulates in a labyrinth-like manner through the chambers (35, 39, 37) from the second fluid inlet (7) to the second fluid outlet (9).SELECTED DRAWING: Figure 2

Description

The present invention generally relates to heat exchangers, and more particularly to heat exchangers for vehicle exhaust lines.

In order to recover the thermal energy of the exhaust gas, it is possible to mount a heat exchanger on a vehicle having a combustion engine.

Such heat exchangers can include tubes through which exhaust gas flows, the tubes being placed within the envelope, inside which the fluid, typically a cooling medium, circulates.

The temperature of the exhaust gas is high and, when the engine is operating at full load, is typically several hundred degrees Celsius when it enters the pipe.

Therefore, there is a risk of boiling when the cooling medium flows in contact with the upstream portion of the tube. When the cooling medium boils, the vaporized cooling medium no longer cools the heat exchanger, so an increase in the temperature of the heat exchanger will be observed. An increase in the temperature of the heat exchanger wall results in an increase in heat constraints, including damage to the heat exchanger, and causes significant deterioration of the cooling medium. To limit this risk, the circulation of the cooling medium must be properly controlled.

In such a situation, the present invention aims to propose a heat exchanger in which the circulation of the cooling medium is appropriately controlled.

To this end, in the first aspect, the present invention is:
-Multiple flow tubes for the first fluid,
-A second fluid having an inlet for a second fluid and an outlet for a second fluid that is open to the interior space, partitioning the interior volume in which the pipes are placed. With the envelope, where the inlet for the fluid and the outlet for the second fluid are offset from each other in the longitudinal direction,
-At least one arranged in the internal space between the inlet of the second fluid and the outlet of the second fluid in the longitudinal direction and dividing the internal space into a plurality of chambers arranged one after another in the longitudinal direction. Two internal lattices, each internal lattice having an orifice, the tube engaging in the orifice, each internal lattice having an outer peripheral edge, and one section of the outer peripheral edge being the inner surface of the envelope. Together with partitioning passages for the second fluid, each passage circulates through the chamber in a labyrinthine manner from the inlet of the second fluid to the outlet of the second fluid. With at least one internal lattice arranged so as
With respect to heat exchangers.

Therefore, the internal grid is arranged to force the second fluid to circulate from the inlet to the outlet of the heat exchanger tube in a labyrinthine manner. Therefore, the second fluid sweeps each chamber one after the other.

If the first fluid is vehicle exhaust and the pipe is arranged such that the upstream portion of the pipe crosses the first chamber where the inlet of the second fluid is open, then the upstream portion of the pipe is , Especially well cooled. The internal grid forces the second fluid to circulate in contact with the upstream portion of the tube.

The heat exchanger may further have one or more of the following features selected individually or in any combination technically possible:
-For each internal lattice, the envelope has an outwardly raised area that separates the passage with sections of the internal lattice;
-In each internal grid, an opening is placed between each tube and the inner edge of the corresponding orifice;
-Each tube has an elongated cross section in the transverse direction and is overlapped in the direction of elevation, and the inner edge of the orifice supports a transverse strip that abuts the tube in the height direction. ;
-The inner edge of each orifice has two transverse edge sections arranged opposite each other, and each transverse edge section supports several strips separated from each other in the transverse direction;
-The orifices of a single internal grid are separated by a transverse full band of the internal grid, each of which defines two transverse edge sections of the orifice and two transverses. The strips of the directional edge section are staggered;
-The strip is tilted towards the inside of the orifice;
-The perimeter of each internal grid has first and second complete bands extending across the orifice in the transverse direction, the first complete band defining the section of the outer perimeter and the first. Has a transverse width less than the width of the perfect band of 2;
-The exchanger comprises several internal grids, all of which are identical, with two consecutive internal grids longitudinally such that the first complete band of the two grids is rotated oppositely in the transverse direction. Oriented in the opposite direction;
-The internal grid closest to the outlet of the second fluid is oriented with the second perfect band rotated towards the outlet of the second fluid, and the envelopes are the first perfect band and the second perfect. Opposite the mid-section of the outer margin located between the bands, it has at least one intermediate region that rises outwards;
-The outer perimeter of each inner grid supports an outer strip that abuts the inner surface of the envelope.

In the second aspect, the present invention is an exhaust line including a heat exchanger having the above-mentioned characteristics, in which the first fluid is an exhaust gas and the second fluid is one of the thermal energies of the exhaust gas. It relates to an exhaust line, which is a cooling medium provided for collecting parts.

The tube is a straight longitudinal tube, the first fluid flows from the upstream end of the tube to the downstream end of the tube, and the inlet for the second fluid faces the upstream end of the tube. It is preferably arranged and the outlet for the second fluid is arranged facing the downstream end of the tube.

The inlet for the second fluid opens into the upstream chamber across which the upstream end of the tube crosses.

The outlet for the second fluid opens into the downstream chamber across which the downstream end of the tube crosses.

The upstream and downstream chambers are located at two opposing longitudinal ends of a series of chambers.

In a third aspect, the invention relates to a vehicle that includes an exhaust line with the features described above.

Other features and advantages of the present invention will be apparent from the following detailed description provided as a mere example reference to the accompanying drawings.

It is a perspective view of the heat exchanger according to this invention. It is a longitudinal fracture view of the heat exchanger of FIG. 1 along the arrow II. It is a fracture view of the heat exchanger of FIG. 1 along the arrow III. It is a disassembled assembly perspective view of the tube and the internal lattice of the heat exchanger of FIG. It is an enlarged view of a part of the internal lattice of FIG. It is an enlarged fracture view of the detail VI of FIG. It is a cross-sectional fracture view of the heat exchanger along the arrow VII of FIG.

The heat exchanger 1 shown in FIG. 1 is typically intended to be incorporated into the vehicle exhaust line. The vehicle is a vehicle having a combustion engine, for example, a passenger car, a freight car, or a two-wheeled vehicle.

The heat exchanger 1
-Multiple flow tubes 3 for the first fluid,
-An envelope 5 that partitions the internal space 6 in which the pipe 3 is arranged, the inlet 7 for the second fluid and the outlet for the second fluid that is open to the internal space 6. Envelope 5 with 9 and
To be equipped.

Typically, the first fluid is vehicle exhaust.

The second fluid is typically a cooling medium provided to recover some of the thermal energy of the exhaust gas.

Typically, the tube 3 is a straight longitudinal tube. The longitudinal direction is indicated by the arrow L in the figure.

As can be seen in FIGS. 1 to 4, the pipes 3 each have an elongated cross section in the transverse direction and are superposed in the height direction.

The transverse direction is indicated by the arrow T in the figure. The height direction is indicated by the arrow E in the figure.

"Cross section" means a cross section perpendicular to the longitudinal direction L.

In the example shown, the tube 3 has a "race track" cross section.

Each tube 3 has a constant cross section, i.e., the cross section is the same, even if the slice planes are considered longitudinally.

Thus, each tube 3 is partitioned by a first large surface 11 and a second large surface 13, which are arranged facing each other and connected by arched sections 15, 17, and the arched sections 15, 17 are connected to each other. They are placed facing each other. The first and second large surfaces 11 and 13 are perpendicular to the height direction E. Therefore, each of the first and second large surfaces 11, 13 extends substantially along the longitudinal and transverse planes. The second large surface 13 of the tube 3 is arranged above the first large surface 11 of the tube 3 arranged directly below the tube 3 in the stack, facing the first large surface 11. ..

The arched sections 15 and 17 are rotated in opposite directions in the transverse direction.

In the example shown, the tubes 3 are arranged to form a single stack in the height direction E. In other words, the heat exchanger 1 includes the only tube 3 that substantially occupies the entire transverse width of the heat exchanger 1 in the transverse direction T. In the present specification, the stack is also referred to as a tube bundle.

Each tube 3 partitions an inlet 19 for a first fluid at one longitudinal end and an outlet 21 for a first fluid at the opposite longitudinal end. A metal foil 23 folded so as to form fins is inserted into each tube 3.

The envelope 5 has a tubular shape with a central axis that is substantially the longitudinal axis. The envelope 5 has a substantially rectangular cross section that includes the four large surfaces 24, which are generally flat and connected to each other via a rounded portion. ..

The envelope 5 partitions the upstream opening 25 and the downstream opening 27 at its two longitudinal ends, into which the end grid 29 engages. As used herein, the terms "upstream" and "downstream" are understood in relation to the direction of first fluid flow.

The end grid 29 has an orifice 31 for receiving the longitudinal end of the tube 3. These longitudinal ends are fixed within the orifice 31 in an airtight manner and cross the end grid 29.

Therefore, the tube 3 extends longitudinally beyond the entire length of the envelope 5.

The inlet 7 of the second fluid and the outlet 9 of the second fluid are offset from each other in the longitudinal direction.

The inlet 7 is located near the upstream opening 25 in the longitudinal direction and the outlet 9 is located near the downstream opening 27.

In the example shown, the second fluid inlet 7 and the second fluid outlet 9 are slots cut into the envelope 5. These slots are elongated in the height direction E and have a height substantially equal to the height of the stack of tubes 3.

Advantageously, the heat exchanger 1 comprises at least one internal grid 33 disposed in the interior space 6 between the inlet 7 of the second fluid and the outlet 9 of the second fluid in the longitudinal direction.

The internal grid 33 divides the internal space 6 into a plurality of chambers arranged one after another in the longitudinal direction.

The heat exchanger 1 may include one internal grid 33 or two internal grids 33, depending on the longitudinal length of the heat exchanger 1, or three internal grids as in the example shown in the drawings. 33 or any other number of internal grids 33.

Each internal grid 33 typically extends perpendicular to the longitudinal direction L.

The interior space 6 includes at least one upstream chamber 35 in which the inlet 7 of the second fluid is open and a downstream chamber 37 in which the outlet 9 of the second fluid is open.

Optionally, the interior space 6 may include one or more intermediate chambers 39 arranged between the chamber 35 and the chamber 37 in the longitudinal direction.

Each chamber 35, 37, 39 extends over the entire cross section of the interior space 6 in the transverse direction. Therefore, each of the chambers 35, 37, 39 occupies a longitudinal cross section of the interior space 6.

The upstream chamber 35 is partitioned between an end grid 29 engaged in the upstream opening 25 of the envelope 5 and an internal grid 33 located most upstream. The downstream chamber 37 is partitioned between the end grid 29 engaged within the downstream opening 27 of the envelope 5 and the most downstream internal grid 33.

Each intermediate chamber 39 is partitioned between two internal grids 33.

As can be seen in FIG. 4, each internal grid 33 has an orifice 41 in which the tube 3 engages. The internal grid 33 has one orifice 41 for one tube 3.

Each orifice 41 has a closed contour. The orifice 41 has an internal cross section close to the lateral cross section of the corresponding pipe 3.

In the example shown, the orifices 41 of each internal grid 33 are all elongated in the transverse direction. The orifices 41 are superposed in the height direction E. The orifices 41 are all the same.

In particular, in one aspect of the invention, as can be seen in FIG. 2, each internal grid 33 has an outer peripheral edge 42 (FIG. 4), one section 43 of which is for the second fluid along with the inner surface of the envelope 5. Section 45 of the passage 45. Each passage 45 is arranged such that the second fluid circulates from the inlet 7 of the second fluid to the outlet 9 of the second fluid through the chambers 35, 39, 37 in a maze-like manner.

As used herein, "circulating in a maze-like manner" means that the second fluid circulates from the inlet 7 over a path that includes a series of 180 ° U-turns. Define the slot.

In other words, in the passage 45, the second fluid starts from the inlet 7 of the second fluid, crosses the upstream chamber 35 in the transverse direction, makes a U-turn, crosses the passage 45, and is upstream of the subsequent chambers. Arranged to enter chamber 35.

The second fluid then crosses the next chamber in a transverse direction to reach the outlet 9 of the second fluid, or if the heat exchanger contains three or more chambers, to enter the next chamber. , Further 180 ° direction change is performed up to the outlet 9 of the second fluid.

In the example shown, each internal grid 33 is substantially rectangular and the sections 34 extend over one side of the internal grid 33. The rest of the outer peripheral edge 42 abuts on the inner surface of the envelope 5 so as to prevent the passage of the second fluid.

For this purpose, the outer peripheral edge 42 of each inner grid 33 has an outer strip 47 (FIGS. 4 and 5) that abuts on the inner surface of the envelope 5 (FIG. 6).

In the example shown, each internal grid 33 includes one outer strip 47 on each side.

The outer strip 47 is folded to form an angle slightly greater than 90 ° with respect to the surface on which the orifice 41 through which the tube 3 passes is formed. The outer peripheral edge 42 does not have a folded strip at its corner position, but has an unfolded strip 49 on the surface of the orifice 41 for the passage of the tube 3. The free end of the unfolded strip 49 fits into the inner surface of the envelope 5 to create a tight seal against the second fluid.

The outer strip 47 supported by section 43 does not abut on the inner surface of the envelope 5. On the other hand, the outer strip 47 supported by the other portion of the outer peripheral edge abuts on the inner surface of the envelope 5.

Further, in each internal lattice 33, an opening 51 is provided between each pipe 3 and the inner edge portion 53 of the corresponding orifice 41 (FIG. 7).

As can be seen in the drawing, the inner edge 53 of the orifice 41 supports a transverse strip 55 that abuts the tube 3 in the height direction E (FIGS. 4-6).

More specifically, the inner edge 53 of each orifice 41 has two transverse edge sections 57 arranged facing each other. The transverse edge sections 57 are connected to each other via a terminal edge section 59.

Each transverse edge section 57 supports several strips 55 that are spaced apart from each other in the transverse direction.

The strip 55 is tilted inward of the orifice 41, as shown in FIG. The strip 55 forms an angle β between 2 ° and 6 ° with respect to the longitudinal direction L, typically equal to 4 °.

The strips 55 are all tilted in the same way.

In particular, as can be seen in FIGS. 4 and 5, the orifices 41 of a single internal grid 33 are separated from each other by a transverse perfect band 61 of the internal grid 33.

Each transverse perfect band 61 defines a transverse edge section 57 of the orifice 41 arranged directly below and a transverse edge section 57 of the orifice 41 arranged directly above.

The strips 55 of these two transverse edge sections 57 are staggered, as measured more clearly in FIG.

This means that the strip 55 supported by one of the two transverse edge sections 57 is separated by a space 63. The strip 55 of the other transverse edge section 57 is located on the opposite side of the space 63.

Here, the opening 51 corresponds to the spacing 63 between the strips 55.

Advantageously, the sum of the transverse lengths of the strips 55 is equal to half the transverse width of the pipe 3.

The clearance angle β allows for maintaining distances between the various tubes 3 and for centering the bundle of tubes 3 in the height direction E within the envelope 5 of the heat exchanger 1.

For this purpose, in the stationary state, the free edges of the strip 55 on both sides of a single orifice 41 are separated in the height direction E by a distance shorter than the width of the tube 3. The thickness is along the height direction E.

When the tube 3 is inserted into the orifice 41, the strip 55 is elastically flexed to allow the tube 3 to pass through without play.

Similarly, the outer strip 47 allows the inner grid 33 to engage within the envelope 5 due to the elastic bend of the outer strip 47. The clearance angle of the outer strip 47 may be greater than the clearance angle of the strip 55 to ensure potentially greater tolerances.

For each internal grid 33, the envelope 5 has an outwardly raised region that partitions the passage 45 with the section 43 of the internal grid 33. The raised region 65 is hollow in the direction toward the inside of the envelope 5. The raised area 65 is located opposite section 43 in the transverse direction. The raised region 65 extends over most of the transverse width of the envelope 5.

Therefore, it is possible to increase the free flow region available to the second fluid through the passage 45. This reduces back pressure.

Advantageously, the internal grids 33 are all identical.

The outer peripheral edge 42 of the inner grid 33 has first and second complete bands 67, 69 extending in the transverse direction T on both sides of the orifice 41.

The first perfect band 67 is elongated in the height direction E. The first complete band 67 is adjacent to the terminal edge section 59 of the orifice 41. The first complete band 67 is located at the first transverse end of the orifice 41.

The second perfect band 69 also extends in the height direction E. The second complete band 69 is adjacent to the end edge section 59 on the opposite side of the orifice 41. The second complete band 69 is located on the other transverse side of the orifice 41.

The first complete band 67 defines the section 43 of the outer peripheral edge 42 and has a width l1 in the transverse direction. The second complete band 69 has a width l2 in the transverse direction. The transverse width l1 is smaller than the transverse width l2.

Further, the inner grid 33 is arranged so that two continuous inner grids 33 in the longitudinal direction L have inverted directions. The perfect band 67 of the two internal grids 33 is inverted in the transverse direction T.

Therefore, the passage 45 partitioned by two continuous internal grids 33 is arranged on two opposite sides in the transverse direction of the heat exchanger 1, thereby allowing a maze-like circulation.

Corresponding raised regions 65 are also arranged on two opposite sides of the heat exchanger 1 in the transverse direction.

The internal grid 33 closest to the second fluid inlet 7 is oriented such that the first complete band 67 is located opposite the second fluid inlet 7 in the transverse direction. Therefore, the passage 45 from the upstream chamber 35 to the chamber immediately downstream is arranged on the opposite side of the second fluid inlet 7 in the transverse direction. The second fluid is forced to traverse the entire upstream chamber 35 starting at the inlet 7 of the second fluid in order to reach the passage 45.

The internal grid 33 closest to the outlet 9 of the second fluid is oriented with the first perfect band 67 rotated in the transverse direction to the opposite side of the outlet 9 of the second fluid. Therefore, the passage 45 that allows access to the downstream chamber 37 is located opposite the outlet 9 of the second fluid in the transverse direction. The second fluid entering the downstream chamber 37 through the passage 45 is forced to traverse the entire downstream chamber 37 in order to reach the outlet 9 of the second fluid.

If the heat exchanger 1 includes several internal grids 33, the envelope 5 has a specific shape at the location of the internal grids 33 closest to the outlet 9 of the second fluid. More specifically, the envelope 5 is an intermediate region that rises outward, opposite the intermediate section 73 of the outer peripheral edge 42 that is located between the first complete band 67 and the second complete band 69. Has 71.

The envelope 5 preferably includes two outwardly raised intermediate regions 71 arranged on two opposing sides in the height direction E of the envelope 5.

In the example shown, the intermediate section 73 of the outer peripheral edge 42 is the side of the inner grid 33 with transverse orientation. These sides connect the first and second complete bands 67, 69 to each other. One of the intermediate sections 73 is located above the stack of tubes 3 and the other intermediate section 73 is located below the stack of tubes 3.

Each intermediate raised region 71 typically extends longitudinally over substantially the entire width of the envelope 5.

Therefore, a detour 75 for the second fluid is created between each intermediate section 73 and each intermediate raised region 71.

In other words, the second fluid can simultaneously flow into the downstream chamber 37 through the passage 45 and the detour 75.

These detours 75 allow for reduced back pressure on the upper and lower sides of the stack of pipes 3.

The internal grid 33 is usually formed from a thin metal sheet with a thickness between 0.2 mm and 0.8 mm, typically having a thickness of 0.4 mm.

The internal grid is preferably obtained by cutting and folding a thin metal sheet. These operations make it possible to form an orifice 41 for the passage of the pipe 3, strips 47 and 55, and unfolded strip 49.

Next, the operation of the heat exchanger 1 shown in the drawings will be described.

The first fluid flows through the tube 3. The first fluid enters each pipe 3 via the upstream end 19 of the pipe 3 and exits through the downstream end 21.

The first fluid is cooled in the heat exchanger 1 so that it has a higher temperature at the upstream end 19 than at the downstream end 21.

The second fluid enters the interior space 6 through the inlet 7 for the second fluid. The presence of the internal grid 33 at the most upstream position forces the second fluid to flow transversely between the tubes 3. Therefore, the second fluid traverses the upstream chamber 35 up to the passage 45. At the position of passage 45, the second fluid follows a U-shaped path and enters the first intermediate chamber 39, where the second fluid flows in the opposite direction in the transverse direction. The second fluid flows again across the entire width of the intermediate chamber 39 up to the passage 45 located at the opposite transverse end of the intermediate chamber 39.

The second fluid that enters the intermediate chamber 39 via the passage 45 is carried toward the second internal grid 33 by its inertia. On the other hand, a part of the second fluid flows from the upstream chamber 35 to the first intermediate chamber 39 through the opening 51. Therefore, the region of the first intermediate chamber 39 arranged directly along the most upstream internal grid 33 is swept by the second fluid coming in through the opening 51.

The second fluid flows from the first intermediate chamber 39 through a passage 45 laterally arranged beside the inlet 7 of the second fluid and the outlet 9 of the second fluid, and also through the second internal grid. It moves to the second intermediate chamber 39 through the opening 51 of 33.

The second fluid moves from the second intermediate chamber 39 to the downstream chamber 37 via both the passage 45 and the detour 75 partitioned by the third internal grid 33. The second fluid also passes through the opening 51 of the third internal grid 33.

The second fluid exits the downstream chamber 37 via the outlet 9 of the second fluid.

The present invention has a plurality of advantages.

The second fluid flows in a maze-like manner from the inlet 7 of the second fluid through the chambers 35, 39, 37 to the outlet 9 of the second fluid, so that the tube arranged in the upstream chamber 35 The portion is swept particularly well by the second fluid.

This ensures good cooling of the first fluid when the first fluid is very hot, without any risk of boiling the second fluid.

The fact that the envelope has an outwardly raised area to partition the passage connecting one chamber to another allows for easy adjustment of the amount of liquid passing through the passage. This adjustment is made by selecting the depth of the raised area.

The presence of an opening located between each tube and the inner edge of the corresponding orifice in the internal grid allows the area of interior space just upstream of the internal grid to be swept with sufficient flow of a second fluid. It will be possible.

The transverse strip supported by the inner edge of the orifice makes it possible to control the distance between the tubes in the height direction. Therefore, the pipes are not provided with protrusions that bring the pipes into contact with each other. Such protrusions are traditionally used to control the height of the space between pipes. They have the disadvantage that there are no contacts between the fins and the walls of the tube, which locally impedes the flow of heat from the fins to the tube at the location of the protrusions.

The fact that the strips are separated from each other in the transverse direction allows an opening to be conveniently created between each tube and the inner edge of the corresponding orifice.

Therefore, the amount of second fluid passing through the opening can be easily controlled by adjusting the spacing between the strips in the transverse direction.

The fact that the strips supported by a single transverse perfect zone are staggered allows the creation of more complex channels for a second fluid passing through the opening. This reduces the flow through between the tube and the edge of the corresponding orifice.

The strip is tilted towards the inside of the orifice so that the tube bundle can be centered in the height direction within the body of the heat exchanger and also maintains the space between the tubes in the height direction. be able to. This also greatly facilitates the insertion of the tube into the orifice.

The fact that first and second complete bands with different transverse widths are provided on either side of the orifice makes it possible to provide a labyrinthine flow using the same grid.

For this purpose, the continuous grid is rotated in the opposite direction.

This further means that the bundle of tubes is conveniently centered with respect to the envelope in the transverse direction.

The danger that the second fluid may boil is inherently present in chambers where the inlet of the second fluid is open and, in some cases, in chambers located immediately downstream. This danger is believed to be virtually non-existent in the most downstream chambers where the second fluid outlet is open.

Therefore, it is advantageous to provide at least one intermediate region in the envelope that rises outward at right angles to the internal grid closest to the exit.

As mentioned above, this allows detours to be created around the internal grid, which reduces back pressure on the upper and lower sides of the bundle. In particular, this allows an increase in the flow rate of the second fluid in the upper and lower chamber portions of the tube bundle. As mentioned above, the inlet for the second fluid has a height in the height direction that is substantially equal to the height of the tube bundle. Its upper end reaches the height of the upper tube and its lower end reaches the height of the lower tube. Since the envelope is curved between its sides and its top / bottom surfaces, it is not possible to further expand the fins.

The space of the upstream chamber located above and below the tubing bundle has less contact with the second fluid entering the inlet than the space laid between the tubing. The raised intermediate region makes it possible to increase the flow rate of the second fluid in these low supply spaces of the downstream chamber.

A plurality of modified forms of the above-mentioned heat exchanger can be considered.

The present invention has been described using linear tubes that extend longitudinally over the entire length of the heat exchanger and pass through the upstream chamber, any intermediate chamber, and downstream chamber in this order.

The tube may have any other shape or arrangement. The tube may be U-shaped, including, for example, two longitudinal portions connected by an arch.

It was mentioned above that each internal grid has outer strips 47 separated from each other. In one variant, each internal grid has a single strip extending circumferentially along the entire outer peripheral edge 42.

In this case, the grid is manufactured by punching.

Alternatively, each internal grid is made from a thicker metal plate. The orifice 41 for receiving the pipe is cut out. The grid does not have an outer strip 47 or strip 55 to separate the tubes. The opening 51 is made by removing the metal or deforming the metal.

The width of the transverse strip 55 is not always constant. The strip 55 can have a variable width in the transverse direction along a single orifice. The width of the strip 55 may also vary between one grid and another.

It was mentioned above that the internal grids are all identical to optimize manufacturing costs. In one variant, the internal grids differ from each other, thereby allowing adaptation of the fluid behavior of the heat exchanger.

In the example described, the grid is rectangular. In one variant, the grid is oval in a "race track" configuration, or in any other suitable form.

In this case, the envelope has a cross section that corresponds to the shape of the grid.

In the example shown, the heat exchanger contains only one tube in the transverse direction. In one variant, the heat exchanger includes several tubes juxtaposed in the transverse direction.

In one variant, the heat exchanger is not provided for incorporation into the vehicle exhaust line. The heat exchanger can be incorporated into any other circuit of the vehicle or even into any other type of equipment.

The first fluid is not necessarily the exhaust gas of the vehicle. The first fluid may be of any other type. The first fluid may be a gas or a liquid and may be of any type.

Similarly, the second fluid is not necessarily a cooling medium. The second fluid is any kind of gas or liquid.

1 heat exchanger 3 flow tube, tube 5 envelope 6 internal space 7 inlet 9 outlet 11 first large surface 13 second large surface 15 arched section 17 arched section 19 inlet, upstream end 21 outlet, downstream end 23 Metal foil 24 Large surface 25 Upstream opening 27 Downstream opening 29 End lattice 31 Orchid 33 Internal lattice, inner lattice 34 Section 35 Upstream chamber 37 Downstream chamber 39 Intermediate chamber 41 orifice 42 Outer perimeter, outer perimeter 43 Section 45 Passage 47 Outer strip, Outer strip 49 Unfolded strip 51 Opening 53 Inner edge, inner edge 55 Strip 57 Transverse edge section 59 End edge section 61 Transverse perfect band, full transverse band 63 Space 65 Uplift Area 67 1st complete band 69 2nd complete band 71 Intermediate area, intermediate raised area 73 Intermediate section 75 Detour E Height direction L Longitudinal direction l1 Crossing direction width l2 Crossing direction width T Crossing direction β Clearance angle

Claims (13)

-Multiple flow tubes (3) for the first fluid,
-In which the internal space (6) in which the pipe (3) is arranged is partitioned, and the inlet (7) for the second fluid and the second fluid that are open to the internal space (6). An envelope (5) having an outlet (9) for the second fluid, the inlet (7) for the second fluid and the outlet (9) for the second fluid being offset from each other in the longitudinal direction. )When,
− In the longitudinal direction, it is arranged in the internal space (6) between the inlet (7) of the second fluid and the outlet (9) of the second fluid, and the internal space (6). Is at least one internal lattice (33) that divides the internal lattice (33) into a plurality of chambers (35, 39, 37) arranged one after another in the longitudinal direction, wherein the internal lattice (33) or each of them has an orifice (41). The tube (3) engages in the orifice (41) and the internal lattice (33) or each of them has an outer peripheral edge (42) and is one of the outer peripheral edges (42). One section (43) partitions the passage (45) for the second fluid with the inner surface of the envelope (5), and the passage (45) or each of which is the second fluid. From the inlet (7) of the second fluid to the outlet (9) of the second fluid, it is arranged to circulate in a labyrinthine manner through the chambers (35, 39, 37). With at least one internal lattice (33),
A heat exchanger (1). For the internal grid (33) or each of them, the envelope (5) has an outwardly raised region (65), and the region (65) traverses the passage (45) into the internal grid. The heat exchanger (1) according to claim 1, which is partitioned from the section (43) of (33). Claim 1 or 2, wherein an opening (51) is provided between each tube (3) and the inner edge (53) of the corresponding orifice (41) in the internal grid (33) or each of them. The heat exchanger (1) described. Each of the pipes (3) has an elongated cross section in the transverse direction and is overlapped in the height direction (E), and the inner edge portion (53) of the orifice (41) is formed in the height direction (E). ), The heat exchanger (1) according to any one of claims 1 to 3, which supports a transverse strip (55) that abuts on the pipe (3). The internal edges (53) of each orifice (41) have two transverse edge sections (57) arranged opposite each other, and the transverse edge sections (57) are mutually opposite in the transverse direction. The heat exchanger (1) according to claim 4, which supports several strips (55) that are separated. The orifice (41) of a single internal grid (33) is separated by a complete transverse band (61) of the internal grid (33), and the complete transverse band (61) is the orifice (41), respectively. 5. The heat exchanger according to claim 5, wherein the two transverse edge sections (57) of the two transverse edge sections (57) are defined, and the strips (55) of the two transverse edge sections (57) are arranged alternately. (1). The heat exchanger (1) according to any one of claims 4 to 6, wherein the strip (55) is tilted toward the inside of the orifice (41). The internal lattice (33) or its respective outer peripheral edge (42) forms a first and second complete band (67, 69) extending on each side of the orifice (41) in the transverse direction (T). The first complete band (67) defines the section (43) of the outer peripheral edge (42) and is smaller than the width of the second complete band (69) in the transverse direction. The heat exchanger (1) according to any one of claims 4 to 7, which has the width of the above. It comprises several internal grids (33) that are all identical, with two consecutive internal grids (33) having the first complete band (67) of the two internal grids (33) in the transverse direction ( The heat exchanger (1) according to claim 8, which is oriented in the opposite direction in the longitudinal direction (L) so as to be rotated in the opposite direction in T). A state in which the internal lattice (33) closest to the outlet (9) of the second fluid rotates the second complete band (69) toward the outlet (9) of the second fluid. The intermediate section (73) of the outer peripheral edge portion (42) oriented with and with the envelope (5) disposed between the first complete band (67) and the second complete band (69). The heat exchanger (1) according to claim 9, which has at least one intermediate region (71) raised outwardly opposite the surface of the heat exchanger. 10. One of claims 1-10, wherein the inner grid (33) or its respective outer peripheral edge (42) supports an outer strip (47) that abuts the inner surface of the envelope (5). Heat exchanger (1). The exhaust line including the heat exchanger (1) according to any one of claims 1 to 11, wherein the first fluid is an exhaust gas and the second fluid is an exhaust gas. An exhaust line, which is a cooling medium provided to recover some of the heat energy. A vehicle comprising the exhaust line according to claim 12.

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