FR3076894A1 - HEAT EXCHANGER TRITHERME - Google Patents

Abstract

A circulation duct assembly (10) of a heat exchanger (1), comprising at least a first inner plate (100), a second inner plate (200), a first outer plate (300) and a second outer plate ( 400), the first inner plate (100) and the second inner plate (200) defining a first conduit (12) arranged for the circulation of a first fluid, the first inner plate (100) and the first outer plate (300). delimiting a second conduit (14) arranged for the circulation of a second fluid, the second inner plate (200) and the second outer plate (400) defining a third conduit (16) arranged for the circulation of the second fluid.

Description

TRITHERMAL HEAT EXCHANGER

The field of the present invention is that of heat exchangers, in particular intended to equip the air conditioning loops of motor vehicles.

A vehicle’s air conditioning system operates through heat exchangers between a refrigerant and an air flow to be sent into the vehicle’s interior. This system generally occupies a large part of the space within the passenger compartment of the vehicle, while generating noise pollution. Therefore, moving the ventilation system in the engine compartment saves space in the passenger compartment of the vehicle, the space saved can thus be used to arrange the passenger compartment differently while limiting noise inside the vehicle. cabin, all elements that improve the user experience.

For the integration of the ventilation system in the engine compartment, solutions have been proposed in order to move this system to this place where the available space is very limited, in particular by reducing the size of certain elements of the system or by modifying their arrangement. or their position within the system.

However, the performance of the ventilation system can then be reduced due to the reduction in the size of some of its elements or their arrangement within the engine compartment. In fact, to function properly, the ventilation system must be able to capture an air flow and pass it through the heat exchangers that constitute it. A poorly designed ventilation system does not allow this optimal circulation, which limits the efficiency of the system and does not allow to quickly respond satisfactorily to the wishes of vehicle users in terms of heat treatment.

In addition, more and more parts of the vehicle are integrated under the hood of the vehicle. Also, we seek to limit the size of each element, in particular the exchangers.

The object of the present invention is therefore to solve the problems mentioned above by proposing a compact heat exchanger which integrates a set of circulation conduits according to the invention, arranged to reduce the size of the air conditioning system in which it s 'inserts, while maintaining system performance and limiting its consumption.

The invention therefore relates to a set of conduits for circulation of a heat exchanger, the set comprising at least a first internal plate, a second internal plate, a first external plate and a second external plate, the first internal plate. and the second internal plate delimiting a first conduit arranged for the circulation of a first fluid, the first internal plate and the first external plate delimiting a second conduit arranged for the circulation of a second fluid, the second internal plate and the second plate external delimiting a third conduit arranged for the circulation of the second fluid.

It is understood that the internal plates are so qualified in that they are arranged inside a volume delimited by the external plates.

This arrangement makes it possible to reduce the size of the ventilation system, without reducing its performance. The reduced size of the ventilation system allows it to be moved out of the vehicle interior, to the engine compartment. Consequently, the space gained in the passenger compartment makes it possible to improve the experience of using the vehicle, in particular by proposing a modular organization of the passenger compartment while maintaining thermal performance that meets the expectations of the user or users of the vehicle. .

The set of traffic conduits according to the invention advantageously includes any one of the following characteristics, taken alone or in combination:

the internal plates have a shape different from the external plates. In other words, the internal plates differ from the external plates by at least one parameter. This parameter can be chosen from a dimensional parameter of the plate such as for example the thickness of the plate, the arrangement of the elements of the plate, the presence or absence of an additional element, without however being limited to the list given here, the external plates have an identical conformation, that is to say that their shape is identical. The external plates are thus undifferentiated, an external plate being able to be substituted for another external plate without particular arrangement, the first internal plate is symmetrical with the second internal plate compared to a plane. This plane is parallel to the general plan of extension of the first plate. A peripheral edge of the plate is part of this plane of symmetry. In other words, the second inner plate is the mirror image of the first inner plate. The first internal plate is thus chiral with respect to the second internal plate, at least one internal plate has a rectangular shape, a hole at each angle, two holes being bordered by a collar extending towards the outside of the first conduit, the two other holes being bordered by a collar extending towards the inside of the first conduit. The internal term designates the direction tending to approach a space comprised between the first internal plate and the second internal plate, the external term designating the opposite direction, that is to say which moves away from this space, the two collars of the internal plate extending towards the interior of the first conduit are each at a longitudinal end of the internal plate, the two collars of the internal plate extending towards the interior of the first conduit are diagonally opposite. In other words, the two collars of the internal plate extending towards the inside of the first duct are each arranged in a corner of the rectangle forming the plate, these corners being those which are separated by the greatest distance between corners, the collar of the first internal plate extending towards the interior of the first conduit is tightly secured to the collar of the second internal plate extending towards the interior of the first conduit. This arrangement prohibits the circulation of the second fluid in the first circulation duct, the collar of the first internal plate extending towards the outside of the first duct is tightly secured to the first external plate. This arrangement prohibits the circulation of the first fluid in the second circulation conduit and / or the third circulation conduit, at least two collars of the plate extending towards the outside of the first conduit are each at a different longitudinal end of the plate . Thus, the two collars of the internal plate extending towards the outside of the first conduit are each at a different longitudinal end from the internal plate. At least two collars of the external plate are each at a different longitudinal end of the external plate, at least two collars of the plate extending towards the inside of the first duct are diagonally opposite, the external plate has a rectangular shape, a hole at each corner, at least one of the holes being bordered by a collar extending outwards. More particularly, each hole of the external plate is bordered by a collar extending towards the outside of the first conduit. The designation towards the outside of the first pipe means that the collar extends in a direction tending to move it away from the first pipe. Likewise, the collar of the external plate extending towards the outside of the first conduit also extends towards the exterior of the second conduit or of the third conduit, depending on the conduit which the external plate delimits, the collar of the internal plate extending towards the outside of the first conduit is tightly secured with one of the collars of the external plate extending towards the outside of the first conduit. The collar of the first internal plate extending towards the outside of the first conduit is tightly secured to one of the collars of the first external plate extending towards the exterior of the first conduit. The collar of the second internal plate extending towards the outside of the first conduit is tightly secured with one of the collars of the second external plate extending towards the outside of the first conduit. This arrangement prohibits the circulation of the first fluid in the second circulation duct and / or the third circulation duct, the collar of the internal plate extending towards the outside of the first duct is tightly secured in the collar of the plate. outer extending outward from the first conduit, the collar of the inner plate extending outward from the first conduit and the collar of the outer plate extending outward from the first conduit extending into the Same direction. This arrangement prohibits the circulation of the first fluid in the second circulation conduit and / or the third circulation conduit, the assembly of circulation conduits comprises a zone for supplying the second conduit and / or the third conduit, delimited by the two internal plates and the two external plates, in particular by their respective collars. Such a supply zone makes it possible on the one hand to supply the second duct and / or the third duct with a first set of circulation ducts, and on the other hand makes it possible to supply the second duct and / or third duct a second set of circulation conduits adjacent to the first set of circulation conduits, at least part of the supply zone is delimited by the internal plates, said part being interposed between the second conduit and the third conduit, the set of circulation conduits comprises at least one device for disrupting the flow of one of the two fluids capable of flowing between two adjacent plates, at least one face of at least one internal plate is covered with an anti-corrosion treatment . More particularly, it is the inner face of at least one internal plate which carries a layer of an anticorrosion material, each plate comprising a peripheral edge, the plates being joined together via their peripheral edge. This joining is ensured by brazing the peripheral edges of the plates, the peripheral edge of the internal plates is interposed between the peripheral edge of the external plates. In this arrangement, in the event of a problem of joining between the peripheral edges of the internal plates, the fluid circulating between the internal plates will escape from the set of circulation conduits and not into the second and / or third conduit. A leak from the first conduit is thus more easily detectable, the first conduit is arranged for the flow of a heat-transfer liquid, the second conduit and / or the third conduit are arranged for the flow of a coolant.

The invention also relates to a heat exchanger comprising a plurality of heat exchange assemblies, two adjacent heat exchange assemblies delimiting a fourth duct, arranged for the flow of a third fluid.

The heat exchanger according to the invention advantageously comprises any one of the following characteristics, taken alone or in combination:

the fourth duct is arranged for the flow of an air flow, the heat exchanger comprises at least one dissipator arranged to increase the heat exchanges between the external plates and the air flow. The dissipator is arranged to capture the calories released by the second fluid and transfer them to the air flow passing through the dissipator, the length of the second conduit and / or of the third conduit is greater than the length of at least one dissipator. The length of the second conduit and / or of the third conduit is the dimension along the longitudinal direction of the set of circulation conduits, that is to say the direction in which the assembly of circulation conduits comprising mainly the second conduit and / or the third conduit. The length of the dissipator is the dimension in the longitudinal direction of the heat exchanger, the set of supply zones for the sets of conduits delimits at least one collector, arranged to collect or distribute the second fluid within the exchanger heat. More specifically, the set of supply zones for the sets of conduits delimits a first collector, arranged for the entry of the second fluid within the heat exchanger, and a second collector, arranged for the exit of the second fluid from of the heat exchanger, the heat exchanger comprises a first sleeve arranged to allow the admission of the first fluid inside the heat exchanger and a second sleeve arranged to allow the evacuation of the first fluid from the heat exchanger, the first sleeve being diagonally opposite the second sleeve relative to a bundle of sets of circulation conduits. In this configuration, the first sleeve and the second sleeve are arranged on opposite cheeks of the heat exchanger, the heat exchanger comprises a third sleeve arranged to allow the admission of the second fluid inside the exchanger heat and a fourth sleeve arranged to allow the discharge of the second fluid out of the heat exchanger, the third sleeve being diagonally opposite the fourth sleeve relative to a bundle of sets of circulation conduits. In this configuration, the third sleeve and the fourth sleeve are arranged on opposite cheeks of the heat exchanger, the heat exchanger is arranged to circulate the first fluid in a direction opposite to the direction of circulation of the second fluid, the circulation duct assemblies are brazed together via the collars of the external plates.

Additionally, the invention relates to a heat exchanger inside which the second circulation duct is in contact with the first circulation duct on the one hand and the fourth circulation duct on the other hand. The invention also relates to the use of a heat exchanger as described above as a condenser on air or as a condenser on water.

Other characteristics, details and advantages of the invention will emerge more clearly on reading the description given below by way of indication in relation to the drawings in which FIG. 1 is a perspective view of a heat exchanger according to the invention, FIG. 2 is a perspective view of a set of circulation conduits according to the invention, FIG. 3 is a perspective view of a first internal plate according to the invention, presented from two different angles, FIG. 4 is a perspective view of a second internal plate according to the invention, presented from two different angles, FIG. 5 is a perspective view of an external plate according to the invention, presented from two different angles, the Figure 6 is an exploded view of the set of circulation conduits according to the invention, Figure 7 is a sectional view, along an OLV plane visible in Figure 2, of a set of circulation conduits tion according to the invention, Figure 8 is a detail view of the assembly of plates within a set of circulation conduits according to the invention, Figure 9 is a detail view of the assembly of plates within a set of circulation conduits according to the invention, Figure 10 is a sectional view of a heat exchanger according to a sectional plane 1-1 visible in Figure 2, Figure 11 is a sectional view of a heat exchanger according to a JJ section plane visible in FIG. 2.

it should first be noted that the figures show the invention in detail to implement the invention, said figures can of course be used to better define the invention if necessary.

In the following description, the longitudinal, vertical or transverse designations refer to the orientation of the heat exchanger according to the invention. The longitudinal direction corresponds to the main axis of the heat exchanger in which its largest dimension extends. The vertical direction corresponding to the stacking direction of the plates constituting the heat exchanger, the transverse direction being the direction perpendicular to the other two. The longitudinal, transverse and vertical directions are also visible in a trihedron O, L, V, T shown in the figures. The internal, internal, external and external directions are assessed in relation to a space between the first internal plate and the second internal plate, the internal or internal term designating the direction approaching this space, the external or external term designating the opposite direction, that is to say, which moves away from this space.

Figure 1 shows in perspective a heat exchanger 1, which is a component of a refrigerant circuit which equips a vehicle, in particular automobile. According to the invention, the heat exchanger 1 implements an exchange of calories between a first fluid and a second fluid on the one hand, and between the second fluid and a third fluid on the other hand. It is in this sense that the heat exchanger 1 is qualified as a tritherme. In such a configuration, the heat exchanger 1 is either used as a condenser on air or as a condenser on water. The first fluid is advantageously a cooling fluid. The second fluid is advantageously a heat transfer liquid, such as a water-glycol mixture. The third fluid is advantageously a flow of air, for example sent into a passenger compartment of the vehicle.

The heat exchanger 1 is generally formed by a stack of sets of circulation conduits 10 superimposed on each other along a stacking direction 7 of these sets of circulation conduits 10. This stack is delimited by a first cheek 5θ and a second cheek 52. A dissipator 8 is disposed between two sets of adjacent circulation conduits 10.

The heat exchanger 1 also comprises means for connecting these circulation conduits with on the one hand a circuit of the first fluid outside the heat exchanger 1 and on the other hand with a circuit of the second fluid outside to the heat exchanger 1. The heat exchanger 1 thus comprises a first sleeve 68 through which the first fluid can enter the heat exchanger 1 and a second sleeve 70 through which the first fluid can exit from the exchanger heat 1. This heat exchanger 1 further comprises a third sleeve 72 through which the second fluid can enter the heat exchanger 1, as well as a fourth sleeve 74 through which the second fluid can exit from the heat exchanger 1.

The heat exchanger 1 comprises a first longitudinal end 4θ and a second longitudinal end 42, the first longitudinal end 4θ being opposite the second longitudinal end 42 relative to a bundle 43 of sets of circulation conduits 10 of the exchanger heat exchanger 1. The heat exchanger 1 comprises a first transverse end 44 and a second transverse end 46, the first transverse end 44 being opposite the second transverse end 46 relative to the bundle 43 of sets of circulation ducts 10 of the heat exchanger 1.

The second sleeve 70 and the fourth sleeve 74 are arranged on the first cheek 50. Each sleeve is arranged at a longitudinal end different from the first cheek 50. The second sleeve 70 is arranged at the first longitudinal end 40 of the first cheek 50. The fourth sleeve 74 is arranged at the second longitudinal end 42 of the first cheek 50. The second sleeve 70 and the fourth sleeve 74 are arranged on the first transverse end 44 of the first cheek 50.

The first sleeve 68 and the third sleeve 72 are arranged on the second cheek 52. Each sleeve is arranged at a longitudinal end different from the second cheek 52. The first sleeve 68 is arranged at the first longitudinal end 40 of the second cheek 52. The third sleeve 72 is arranged at the second longitudinal end 42 of the second cheek 52. The first sleeve 68 and the third sleeve 72 are arranged on the second transverse end 46 of the second cheek 52.

In this arrangement, the first sleeve 68 and the second sleeve 7θ are diagonally opposite one with respect to the other. Thus, the first sleeve 68 is the element of the heat exchanger 1 furthest from the second sleeve 7θ · The third sleeve 72 and the fourth sleeve 74 are diagonally opposite each other. In other words, the third sleeve 72 is the element of the heat exchanger 1 furthest from the fourth sleeve 74 ·

In FIG. 2, one can see an example of a set of circulation conduits 10 according to the invention, the stack of which forms the heat exchanger 1. A set of circulation conduits 10 comprises a plurality of plates 100, 200, 3θθ> 4θθ · More particularly, a set of circulation conduits 10 comprises a pair of internal plates 100, 200, consisting of a first internal plate 100 and a second internal plate 200, and a pair of external plates 3θθ> 40θ > consisting of a first external plate 3θθ and a second external plate 4θθ · The shape of the different plates 100, 200, 3θθ> 4θθ is visible in Figures 3 to 5 and will be described below, the assembly of the plates 100, 200, 3θθ> 4θθ to form the set of circulation conduits 10 being visible in FIGS. 6 to 11 and described below.

FIG. 3 shows an example of the first internal plate 100 according to the invention, seen from two angles. The first internal plate 100 has the shape of a bathtub, that is to say it comprises a bottom 120, surrounded by a peripheral edge 122. The bottom 120 of the first internal plate 100 has the shape of a rectangle with rounded corners. The peripheral edge 122 surrounding the bottom 120 extends continuously around the first internal plate 100, without interruption. The peripheral edge 122 comprises an extension 123, parallel to the bottom 120. More particularly, the extension 123 is arranged at one end of the peripheral edge 122 opposite the bottom 120 of the first internal plate 100. The first internal plate 100 comprises an internal face 130 and an external face 132. The internal face 130 is the face of the first internal plate 100 which delimits a first circulation duct 12 oriented in the same direction as the peripheral edge 122, the external face 132 being the face opposite to the face interior 130. The exterior face 132 delimits a second circulation duct 14 · Similarly, the extension 123 of the peripheral edge 122 comprises an interior face 125 and an exterior face 127, the interior face 125 being the face of the extension 123 being oriented in the same direction as the internal face 130 of the first internal plate 100. The external face 127 is the face opposite to the inner face 125 of extension 123 ·

The inner face 130 of the first internal plate 100 is for example covered with an anticorrosion coating, in particular applied before the manufacture of the first internal plate 100, at the time of manufacture of the sheet which is at the origin of the plate. The anticorrosion coating is arranged to protect the face of the internal plate 100, 200 exposed to the heat transfer liquid, this heat transfer liquid being generally corrosive. This anticorrosion coating may in particular be composed of an alloy comprising zinc, aluminum, or any other metal or metal alloy enabling this function to be fulfilled.

The first internal plate 100 includes at least one hole. In the example of the invention, the first internal plate 100 has four holes, arranged at each of the corners of the first internal plate 100. The first internal plate 100 thus comprises a first hole 140, a second hole 150, a third hole 160 and a fourth hole 170. The holes have a circular shape. The holes are through. These holes are arranged to allow the passage of the first fluid or the second fluid.

The holes of the first internal plate 100 are surrounded by a collar. The first hole 140 is surrounded by a collar extending towards the inside of the first conduit 12, called the first internal collar 142. The fourth hole 170 is surrounded by a collar extending towards the inside of the first conduit

12, known as the second internal collar 172. Thus, the first internal collar 142 is arranged diagonally opposite the second internal collar 172.

The second hole 150 is surrounded by a collar extending towards the outside of the first conduit 12, called the first external collar 152. The third hole 160 is surrounded by a collar extending towards the outside of the first conduit 12, said second external collar 162. Thus, the first external collar 152 is arranged diagonally opposite the second external collar 162.

Figure 4 shows a second internal plate 200, seen from two angles. The second internal plate 200 is symmetrical to the first internal plate 100 with respect to a plane parallel to the general extension plane of the first internal plate 100. The plane of symmetry passes through the extension 123 of the first internal plate 100.

The second internal plate 200 thus has a comparable conformation with the first internal plate 100, in particular in its bathtub shape. Thus, the characteristics relating to the first internal plate 100 apply to the second internal plate 200. Thus, the second internal plate 200 comprises a bottom 220, surrounded by a peripheral edge 222. The bottom 220 of the second internal plate 200 has a rectangle shape with rounded corners. The peripheral edge 222 surrounding the bottom 220 extends continuously all around the second internal plate 200, without interruption. The peripheral edge 222 comprises an extension 223, parallel to the bottom 220 and extending from one end of the peripheral edge 222 opposite to one end of the peripheral edge 222 which connects the peripheral edge 22 to the bottom 220 of the second internal plate 200. The second internal plate 200 comprises an internal face 230 and an external face 232. The internal face 230 is the face of the second internal plate 200 which delimits the first circulation duct 12 in association with the internal face 130 of the first internal plate 100, the external face 232 being the opposite face to the internal face 230. The external face 232 delimits a third circulation duct 16. Similarly, the extension 223 of the peripheral edge 222 comprises an internal face 225 and an external face 227, the internal face 225 being the face of the extension 223 being oriented in the same direction as the inner face 230 of the second plate e internal 200.

The inner face 230 of the second internal plate 200 is for example covered with an anticorrosion coating, in particular applied before the manufacture of the first internal plate 200, at the time of manufacture of the sheet which is at the origin of the plate. The anticorrosion coating is arranged to protect the face of the internal plate 100, 200 exposed to the heat transfer liquid, this heat transfer liquid being generally corrosive. This anticorrosion coating may in particular be composed of an alloy comprising zinc, aluminum, or any other metal or metal alloy enabling this function to be fulfilled.

The second internal plate 200 is however different from the first internal plate 100, in particular in that the collars extending towards the outside of the first conduit 12 and the collars extending towards the interior of the first conduit 12 are not disposed around the same holes. More particularly, a first hole 240 of the second internal plate 200 is surrounded by a collar extending towards the outside of the first conduit 12, called the first external collar 242. A second hole 250 of the second internal plate 200 is surrounded by a collar extending towards the inside of the first conduit 12, called the first internal collar 252. A third hole 260 of the second internal plate 200 is surrounded by a collar extending towards the interior of the first conduit 12, called second internal collar 262. Thus, the first internal collar 252 is arranged diagonally opposite the second internal collar 262. A fourth hole 270 of the second internal plate 200 is surrounded by a collar extending outwards from the first conduit 12, said second external collar 272. Thus, the first external collar 242 is arranged diagonally opposite the second external collar 272.

Together, the first internal plate 100 and the second internal plate 200 define the first circulation conduit 12 where a first fluid can flow.

FIG. 5 shows an example of a first external plate 300 or of a second external plate 400 seen from two angles, these two external plates being of identical conformation.

The first external plate 300 has the shape of a bathtub, that is to say that it comprises a bottom 320, surrounded by a peripheral edge 322. The bottom 320 of the first external plate 300 has a rectangle shape with rounded corners. The first external plate 300 comprises an internal face 330 and an external face 332. The internal face 330 is the face of the first external plate 300 which delimits the second circulation duct 14 in association with the external face 132 of the first internal plate 100 The external face 332 is the opposite face to the internal face 330. The peripheral edge 322 surrounding the bottom extends continuously all around the first external plate 300, without interruption. The peripheral edge 322 includes an extension 323 parallel to the bottom 320. The extension 323 of the first external plate 300 has an internal face 325 and an external face 327 ·

The first outer plate 300 includes at least one hole. In the example of the invention, the first external plate 300 has four holes, arranged at each of the corners of the first external plate 300. The first external plate 300 thus comprises a first hole 340, a second hole 350, a third hole 360 and a fourth hole 370. The holes have a circular shape. The holes are through. These holes are arranged to allow the passage of the first fluid or the second fluid.

The holes of the first external plate 3θθ are surrounded by a collar. The collars extend outward from the first conduit 12 and are said to be external collars. Thus, a first external collar 342 is arranged around the first hole 340, a second external collar 352 is arranged around the second hole 350, a third external collar 362 is arranged around the third hole 360 and a fourth external collar 372 is arranged around the fourth hole 37θ · In conjunction with the first internal plate 100, the first external plate 3θθ delimits the second circulation duct 14 where a second fluid is able to flow.

The second external plate 4θθ is arranged identically to the first external plate 3θθ · In particular, the second external plate 4θθ comprises a bottom 420, surrounded by a peripheral edge 422. The second external plate 4θθ comprises an internal face 430 and a face outer 432. The inner face 430 is the face of the second outer plate 400 which delimits the third circulation duct 16 in association with the outer face 232 of the second inner plate 200. The outer face 432 is the face opposite to the inner face 430. The peripheral edge 422 includes an extension 423 parallel to the bottom 420. The extension 423 of the second external plate 400 has an internal face 425 and an external face 427 · The second external plate 400 has four holes, arranged at each of the corners of the second external plate 400. The second external plate 400 thus comprises a first hole 440, a second hole 450, a three th hole 460 and a fourth hole 470. The holes of the second outer plate 400 are surrounded by a collar. The collars extend outward from the first conduit 12 and are said to be external collars. Thus, a first external collar 442 is arranged around the first hole 440, a second external collar 452 is arranged around the second hole 450, a third external collar 462 is arranged around the third hole 460 and a fourth external collar 472 is arranged around the fourth hole 470. Together with the second internal plate 200, the second external plate 400 delimits the third circulation duct 16 where a second fluid is able to flow.

The plates 100, 200, 300, 400 are produced by stamping, stamping or rolling a strip of a material arranged to allow sufficient heat exchange to allow the heat exchanger 1 to fulfill its role. It may in particular be aluminum or an aluminum alloy.

Whatever the plate considered, the internal direction of a plate designates the direction in which the peripheral edge extends, the external direction designates the opposite direction.

Considering the set of circulation ducts 10, the interior direction designates the direction facing the first circulation duct 12. The exterior direction designates the opposite direction.

The interior direction designates the direction tending to approach the first circulation duct 12. The exterior direction designates the direction tending to move away from the first circulation duct 12.

FIG. 6 shows the assembly of the set of circulation conduits 10 according to the invention. As previously specified, the set of circulation conduits 10 according to the invention comprises a first external plate 3θθ> a first internal plate 100, a second internal plate 200 and a second external plate 4θθ ·

The assembly order of the plates 100, 200, 3θθ> 4θθ is given here by way of example. Other orders can be envisaged, the invention should therefore not be limited to a particular assembly order.

The first internal plate 100 and the second internal plate 200 are positioned opposite one another and are in contact via the extension 123 of the first internal plate 100 and the extension 223 of the second plate internal 200. More specifically, the internal face 125 of the extension 123 of the first internal plate 100 and the internal face 225 of the extension 223 of the second internal plate 200 are in contact. In this assembly, the first internal collar 142 of the first internal plate 100 is in contact with the first internal collar 252 of the second internal plate 200, and the second internal collar 172 of the first internal plate 100 is in contact with the second collar internal 262 of the second internal plate 200. The first internal collar 142 of the first internal plate 100 and the first internal collar 252 of the second internal plate 200 are thus secured in leaktight manner, by being mounted end to end or by penetrating the one inside the other. Similarly, the second internal collar 172 of the first internal plate 100 and the second internal collar 262 of the second internal plate 200 are joined in leaktight manner, by being mounted end to end or by penetrating one into the other. The assembly of the first internal plate 100 and the second internal plate 200 defines a first circulation duct 12.

The internal plates 100, 200 are coupled with the external plates 3θθ> 4θθ · More particularly, the first internal plate 100 is assembled with the first external plate 300, the second internal plate 200 being assembled with the second external plate 4θθ ·

The first internal plate 100 and the first external plate 3θθ are positioned one inside the other, the extension 123 of the first internal plate 100 being in contact with the extension 323 of the first external plate 3θθ · More specifically, the first internal plate 100 and the first external plate 300 are in the same direction, that is to say that the bathtub of the first internal plate 100 fits into the bathtub of the first external plate 3θθ · In this arrangement, the inner face 325 of the extension 323 of the first external plate 3θθ is in contact with the external face 127 of the extension 123 of the first internal plate 100.

The first external collar 152 of the first internal plate 100 is in contact with the second external collar 352 of the first external plate 3θθ> and the second external collar 162 of the first internal plate 100 is in contact with the third external collar 362 of the first external plate 3θ0 ·

The first external collar 152 of the first internal plate 100 is inserted into the second external collar 352 of the first external plate 3θθ by the internal face 330 of the first external plate 300 · In this way, the first external collar 152 of the first internal plate 100 is oriented in the same direction as the second external collar 352 of the first external plate 300 · An external face of the first external collar 152 of the first internal plate 100 is in contact with an internal face of the second external collar 352 of the first external plate 300 · This interaction allows a tight connection between the first external collar 152 of the first internal plate 100 and the second external collar 352 of the first external plate 300.

The contact between the second external collar 162 of the first internal plate 100 and the third external collar 362 of the first external plate 300 takes place in an identical manner to the contact between the first external collar 152 of the first internal plate 100 and the second external collar 352 of the first external plate 3θθ · This contact enables the second external collar 162 of the first internal plate 100 and the third external collar 362 of the first external plate 3θθ to be sealed together

The assembly of the first internal plate 100 and the first external plate 3θθ defines a second circulation duct 14 ·

The second internal plate 200 and the second external plate 4θθ are positioned one inside the other, the extension 223 of the second internal plate 200 being in contact with the extension 423 of the second external plate 4θθ · More specifically, the second internal plate 200 and the second external plate 400 are in the same direction, that is to say that the bathtub of the second internal plate 200 fits in the bathtub of the second external plate 4θθ · In this arrangement, the internal face 425 of the extension 423 of the second external plate 4θθ is in contact with the external face 227 of the extension 223 of the second internal plate 200.

The first external collar 242 of the second internal plate 200 is in contact with the first external collar 442 of the second external plate 4θθ> and the second external collar 272 of the second internal plate 200 is in contact with the fourth external collar 472 of the second external plate 400.

The first external collar 242 of the second internal plate 200 is inserted into the first external collar 442 of the second external plate 400 by the internal face 330 of the second external plate 400. In this way, the first external collar 242 of the second internal plate 200 is oriented in the same direction as the first external collar 442 of the second external plate 400. An external face of the first external collar 242 of the second internal plate 200 is in contact with an internal face of the first external collar 442 of the second external plate 400. This interaction allows a tight connection between the first external collar 242 of the second internal plate 200 and the first external collar 442 of the second external plate 400.

The contact between the second external collar 272 of the second internal plate 200 and the fourth external collar 472 of the second external plate 400 is made in an identical manner to the contact between the first external collar 242 of the second internal plate 200 and the second external collar 442 of the second external plate 400. This contact enables the second external collar 272 of the second internal plate 200 and the fourth external collar 472 of the second external plate 400 to be sealed together.

The assembly of the second internal plate 200 and the second external plate 400 defines a third circulation duct 16.

FIG. 7 illustrates the set of circulation conduits 10, and more particularly the interactions between the collars of the different plates 100, 200, 300, 400.

This assembly defines a fluid supply zone 18 for the second conduit and / or the third conduit. This fluid supply zone 18 of the second conduit and / or of the third conduit is in particular delimited by four plates, that is to say the first internal plate 100, the second internal plate 200, the first external plate 300 and the second external plate 400. More particularly, a supply zone 18 is defined either by the first internal collar 142 of the first internal plate 100, the first external collar 342 of the first external plate 300, the first internal collar 252 of the second internal plate 200 and the second external collar 452 of the second external plate 400, or by the second internal collar 172 of the first internal plate 100, the fourth external collar 372 of the first external plate 300, the second internal collar 262 of the second internal plate 200 and the third external collar 462 of the second external plate 400.

This assembly also defines a fluid supply space 19 for the first conduit. This fluid supply space 19 of the first conduit is delimited by the first internal plate 100 and the second internal plate 200. More particularly, a supply space 19 is defined by either by the second external collar 162 of the first internal plate 100, the third external collar 362 of the first external plate 3θθ> the second external collar 272 of the second internal plate 200 and the fourth external collar 472 of the second external plate 400, or by the first external collar 152 of the first internal plate 100, the second external collar 352 of the first external plate 3θθ> the first external collar 242 of the second internal plate 200 and the first external collar 442 of the second external plate 400.

Thus assembled and as visible in FIG. 8, the extension 123 of the first internal plate 100 is pinched between the extension 223 of the second internal plate 200 and the extension 323 of the first external plate 3θθ · The extension 223 of the second internal plate 200 is pinched between the extension 123 of the first internal plate 100 and the extension 423 of the second external plate 400. The extension 123 of the first internal plate 100 and the extension 223 of the second internal plate 200 are interposed between the extensions 323> 423 of the external plates 3θθ> 4θθ ·

The first circulation conduit 12 is bordered on one side by the second circulation conduit 14 and on the other hand by the third circulation conduit 16. The first circulation conduit 12 extends parallel to the second circulation conduit 14. The first circulation duct 12 extends parallel to the third circulation duct 16.

In the example given here of a set of circulation conduits 10 according to the invention, the first conduit 12, the second conduit 14 and the third conduit 16 do not include a device for disturbing the flow of a fluid in their breast. It will nevertheless be understood that in a variant of the invention, at least one of the first conduit 12, the second conduit 14 and / or the third conduit 16 comprises at least one device for disturbing the flow of a fluid. This disturbance device is designed to improve the heat exchanges between the fluids passing through the various circulation conduits, by improving the mixing of the fluids and by limiting the formation of boundary layers.

Figure 8 also shows a detail of the interaction between the extensions 123, 223 of the peripheral edges 122, 222 of the internal plates 100, 200 and the extensions 323> 423 of the peripheral edges 322, 422 of the external plates 3θθ> 4θθ · More particularly , Figure 8 illustrates the positioning of the extensions 123, 223 of the internal plates 100, 200 between the extensions 323> 423 of the external plates 30θ> 4θθ · This insertion of the extensions 123, 223 of the internal plates 100, 200 between the extensions 323> 423 external plates 3θθ> 4θθ is continuous over the entire periphery of the set of circulation conduits 10.

Thus, in the event of poor attachment between the internal plates 100, 200, the first fluid will escape out of the set of circulation conduits 10 and not into the second conduit 14 and / or the third conduit 16, which makes it possible to 'avoid pollution of the second fluid by the first fluid, in the event of a brazing fault.

FIG. 8 also illustrates the arrangement of the supply zone 18, and in particular the positioning of the first internal collar 142 of the first internal plate 100, of the first external collar 342 of the first external plate 3θθ> of the first internal collar 252 of the second internal plate 200 and the second external collar 452 of the second external plate 4θθ ·

FIG. 9 shows a detail of the circulation duct assembly 10, and in particular the arrangement of the supply space 19 · The supply space 19 comprises in particular the second external collar 162 of the first internal plate 100 , the third external collar 362 of the first external plate 3θθ> the second external collar 272 of the second internal plate 200 and the fourth external collar 472 of the second external plate 4θθ ·

The second external collar 162 of the first internal plate 100 is inserted into the third external collar 362 of the first external plate 3θθ> the two collars extending in the same direction. More particularly, the second external collar 162 of the first internal plate 100 comprises an external face 164, the third external collar 362 of the first external plate 300 comprising an internal face 364, the external face 164 of the second external collar 162 being in contact with the inner face 164 of the third external collar 362 on a portion of each collar.

A similar contact takes place between an outer face 274 of the second outer collar 272 of the second inner plate 200 and an inner face 474 of the fourth outer collar 472 of the second outer plate 4θθ on a portion of each collar, the two collars extending in the same way.

The first fluid is a refrigerant or a mixture between one or more refrigerants and one or more other fluids, the refrigerant (s) being selected from the authorized refrigerants and adapted to the use made of it. The refrigerant or fluids are in particular of the family of bydrocblorofluorocarbons (HCFC), or bydrofluorocarbons (HFC). The refrigerant may in particular be R134a or 1234YF · The refrigerant may also be carbon dioxide known by the acronym R744 ·

The second fluid is a heat transfer liquid or a mixture between one or more heat transfer liquids and one or more other fluids, the heat transfer liquid (s) being selected from the authorized heat transfer liquids and suitable for the use that is made of it. The heat-transfer liquid (s) are in particular water, deionized water, a mixture of glycol and water.

The third fluid is an air flow 9 admitted into a passenger compartment of the vehicle where the heat exchanger 1 is placed. The third fluid passes through the heat exchanger 1 right through, using at least a fourth conduit 20 of circulation bounded by a space between two sets of circulation conduits 10.

Two sets of circulation conduits 10 are interconnected by the external collars of the adjacent external plates, that is to say the first external plate 3θθ of a first set of circulation conduits 10 facing the second external plate 4θθ of a second set of circulation conduits 10. More particularly, the first external collar 342 of the first external plate 3θθ of a first set of circulation conduits 10 is tightly secured to the second external collar 452 of the second plate external 4θθ of a second set of circulation conduits 10. The second external collar 352 of the first external plate 300 of the first set of circulation conduits 10 is sealed with the first external collar 442 of the second external plate 4θθ of the second set of circulation conduits 10. The third external collar 362 of the first external plate 3θθ of the pr first set of circulation conduits 10 is tightly secured to the fourth external collar 472 of the second external plate 4θθ of the second set of circulation conduits 10. The fourth external collar 372 of the first external plate 3θθ of the first set of conduits of circulation 10 is secured in sealed manner with the third external collar 462 of the second external plate 4θθ of the second set of circulation conduits 10.

A dissipator 8 can be arranged between two sets of adjacent circulation conduits 10. More particularly, the dissipator 8 is arranged between an external plate 3θθ> 4θθ of a first set of circulation conduits 10 and an external plate 3θθ> 4θθ of a second set of circulation conduits 10. In this arrangement, the dissipator 8 is disposed in the fourth conduit 20 through which the third fluid passes. The dissipator 8 is arranged to increase the heat exchanges between the external plates 3θθ> 4θθ and the air flow passing through the heat exchanger 1. The dissipator 8 takes the form of a succession of fins arranged to increase the surface of contact between the external plates 3θθ> 4θθ and the air flow, so as to increase the exchange surface. The dissipator 8 extends longitudinally between the first external collar 342 and the third external collar 362. In this arrangement, the length of the dissipator 8 is less than the length of the second circulation duct 14 ·

The supply zones 18 of the sets of circulation conduits 10 forming the heat exchanger 1 together delimits a first collector 54 and a second collector 56. This first collector 54 is particularly visible in FIG. 10, the second collector 56 being illustrated in FIG. 11. The first manifold 54 is arranged to allow the entry of the second fluid within the second conduits 14 and the third conduits 16, the second manifold 56 being arranged to allow the exit of the second fluid from the second conduits 14 and third conduits 16. In this arrangement, the first manifold 54 communicates with the third sleeve 72 to allow the entry of the second fluid within the second conduits 14 and the third conduits 16 from outside the heat exchanger 1. Similarly, the second manifold 56 communicates with the fourth sleeve 74 to allow the exit of the second fluid from the second conduits 14 and third conduits 16 outside the heat exchanger 1.

The supply spaces 19 of the sets of circulation conduits 10 forming the heat exchanger 1 together delimits a first manifold box 58 and a second manifold box 60. This first manifold box 58 is notably visible in FIG. 10, the second box manifold 60 being illustrated in FIG. 11. The first manifold 58 is arranged to allow the entry of the first fluid within the first conduits 12, the second manifold 60 being arranged to allow the exit of the first fluid from the first conduits 12 In this arrangement, the first manifold 58 communicates with the first sleeve 68 to allow the entry of the first fluid into the first conduits 12 from outside the heat exchanger 1. Likewise, the second manifold 60 communicates with the second sleeve 7θ to allow the exit of the first fluid out of the first conduits 12 out of the shell heat hanger 1.

A method of manufacturing the heat exchanger 1 will now be described. This example process is given by way of nonlimiting example, alternative processes that can be used to make the heat exchanger 1 as described above.

The various plates 100, 200, 3θθ> 4θθ which define the set of circulation conduits 10 are stacked. The first internal plate 100 and the second internal plate 200 are positioned between the first external plate 3θθ and the second external plate 4θθ · Several alternations of a set of circulation conduits 10 and of a dissipator 8 are arranged one above of the others and are included between the first cheek 5 deuxième and the second cheek 52.

The first sleeve 68, the second sleeve 70, the third sleeve 72 and the fourth sleeve 74 are then placed.

All of the parts arranged in the previous step are then brazed simultaneously, using a brazing process carried out in an oven. This step will join the different elements together, and will allow in particular the sealing of the different collars together and the different extensions bordering the plates. The heat exchanger 1 is then connected to the loops of the various fluids.

As explained above, other manufacturing processes can be used. In particular, the sets of circulation conduits 10 can be assembled and brazed together with the dissipators 8 during a first step, before being assembled together with the first sleeve 68, the second sleeve 70, the third sleeve 72 and the fourth sleeve 74 to form the heat exchanger 1 in a second step.

The heat exchanger 1 thus arranged is capable of operating according to the following example illustrated in FIG. 1. This example is not limiting, other operations can be envisaged.

The first fluid enters the heat exchanger 1 through the first sleeve 68. The first fluid flows in a first circuit 4, consisting of all of the first circulation conduits 12, to the second sleeve 7θ in a single pass. The first fluid is then discharged from the second sleeve 7 man to a heat treatment loop of the first fluid. Throughout this loop, the first fluid is in a liquid state and it exchanges calories with the second fluid.

The second fluid enters the heat exchanger 1 through the third sleeve 72. The second fluid can be in the gaseous state. The second fluid circulates in a second circuit 8, consisting of all of the second circulation conduits 14 and of the third circulation conduits 16, between the first collector 54 and the second collector 56, and transfers its calories to the first fluid which circulates in the first circuit 4 · This transfer of calories results in a cooling of the second fluid, which passes from the gaseous state to a two-phase gas-liquid state then to a liquid state. In other words, the heat transfer liquid cools the refrigerant, so that the heat exchanger 1 behaves like a condenser or a gas cooler.

The second fluid is then collected in the second manifold before reaching the fourth sleeve 74 and being evacuated. During its circulation in the heat exchanger 1, the second fluid exchanges calories either with the first fluid or with the third fluid.

The circulation of the first fluid within the first conduits of the heat exchanger 1 takes place in a direction opposite to the circulation of the second fluid in the second and third conduits of the heat exchanger 1.

The third fluid crosses the heat exchanger 1 transversely, by circulating in the fourth conduit 20 of the heat exchanger 1. During its circulation in the heat exchanger 1, the third fluid exchanges calories with the second fluid by means of dissipators 8 arranged between the sets of circulation conduits 10 forming the heat exchanger 1.

When the heat exchanger 1 is used in a ventilation system designed to increase the temperature of air intended to be sent into a passenger compartment of the vehicle, the second fluid transfers calories to the third fluid. In other words, the refrigerant heats the air flow.

When the heat exchanger 1 is used in a ventilation system designed to lower the temperature of an air intended to be sent into a passenger compartment of the vehicle, the second fluid transfers calories to the first fluid.

The foregoing description clearly explains how the invention achieves the objectives it has set for itself, and in particular to propose a set of circulation conduits 10 comprising three circulation conduits delimited by four plates.

Of course, various modifications can be made by those skilled in the art to the set of circulation conduits or to the heat exchanger which have just been described by way of nonlimiting example, as soon as one puts using plates delimiting a circulation duct surrounded by two other circulation ducts.

In any event, the invention cannot be limited to the embodiment specifically described in this document, and extends in particular to all equivalent means and to any technically operative combination of these means.

Claims (10)

1. A set of circulation conduits (10) of a heat exchanger (1), comprising at least a first internal plate (100), a second internal plate (200), a first external plate (300) and a second plate external (400), the first internal plate (100) and the second internal plate (200) delimiting a first conduit (12) arranged for the circulation of a first fluid, the first internal plate (100) and the first external plate ( 300) delimiting a second conduit (14) arranged for the circulation of a second fluid, the second internal plate (200) and the second external plate (400) delimiting a third conduit (16) arranged for the circulation of the second fluid. 2. A set of circulation conduits (10) according to the preceding claim, in which the first internal plate (100) is symmetrical with the second internal plate (200) with respect to a plane parallel to the plane of general extension of the first plate internal (100). 3. A set of circulation conduits (10) according to any one of the preceding claims, in which at least one internal plate (100, 200) has a rectangular shape and comprises a hole (140, 150, 160, 170, 240, 250, 260, 270) at each angle, two of the holes (150, 160, 240, 270) being bordered by a collar (152, 162, 242, 272) extending towards the outside of the first conduit (12), the other two holes (140, 170, 250, 260) being bordered by a collar (142, 172, 252, 262) extending towards the inside of the first conduit (12). 4. A set of circulation conduits (10) according to the preceding claim, wherein the collar (142, 172) of the first internal plate (100) extending towards the inside of the first conduit (12) is tightly secured with the collar (252, 262) of the second internal plate (200) extending towards the inside of the first conduit (12). 5. A set of circulation conduits (10) according to any one of claims 3 or 4, in which the collar (152, 162, 242, 272) of the internal plate (100, 200) extending outwards of the first conduit (12) is secured in a sealed manner with the external plate (300, 400). 6. A set of circulation conduits (10) according to any one of the preceding claims, in which the external plate (300, 400) has a rectangular shape and comprises a hole (340, 350, 360, 370, 440, 450, 460, 470) at each angle, at least one of the holes (340, 350, 360, 370, 440, 450, 460, 470) being bordered by a collar (340, 352, 362, 372, 442, 452, 462, 472) extending towards the inside of the first conduit (12). 7. A set of circulation conduits (10) according to the preceding claim together with claim 3, wherein the collar (152, 162, 242, 272) of the internal plate (100, 200) extending outwardly from the first conduit (12) is tightly secured in the collar (352, 362, 442, 472) of the external plate (300, 400), the collar (152, 162, 242, 272) of the internal plate (100, 200) extending towards the outside of the first conduit (12) and the collar (352, 362, 442, 472) of the external plate (300, 400) extending in the same direction, the connection being made between a outer surface of the collar (152, 162, 242, 272) of the inner plate (100, 200) and an inner surface of the collar (352, 362, 442, 472) of the outer plate (300, 400). 8. A set of circulation conduits (10) according to any one of the preceding claims, each plate (100, 200, 300, 400) comprising a peripheral edge (122, 222, 322, 422), the plates (100, 200 , 300, 400) being secured to each other via their respective peripheral edge (122, 222, 322, 422). 9. A set of circulation conduits (10) according to the preceding claim, in which the peripheral edge (122, 222) of the internal plates (100, 200) is interposed between the peripheral edge (322, 422) of the external plates (300, 400). 10. Heat exchanger (1) comprising a plurality of sets of circulation conduits (10) according to any one of the preceding claims, at least two sets of adjacent circulation conduits (10) delimiting a fourth conduit (20), arranged for the flow of a third fluid.