FR3063136A1 - HEAT EXCHANGE DEVICE AND CORRESPONDING AIR CONDITIONING CIRCUIT - Google Patents

Abstract

The invention relates to a heat exchange device for an air conditioning circuit (100) operating with a refrigerant, and comprising an evaporator (111) and an internal heat exchanger (107) in the form of a unitary module (500) of substantially parallelepipedal shape, according to the invention, the device comprises at least one high pressure fluid inlet (210), a high pressure fluid outlet (220), a low pressure fluid inlet (230) and an outlet low pressure fluid (240) grouped in a connection zone (510) disposed near a corner of said unitary module.

Description

Holder (s): VALEO THERMAL SYSTEMS Simplified joint-stock company.

Extension request (s)

Agent (s): VALEO SYSTEMES THERMIQUESTHS.

(04) HEAT EXCHANGE DEVICE AND CORRESPONDING AIR CONDITIONING CIRCUIT.

FR 3 063 136 - A1 _ The invention relates to a heat exchange device for an air conditioning circuit (100) operating with a refrigerant, and comprising an evaporator (111) and an internal heat exchanger (107) placed under the shape of a unit module (500) of substantially parallelepiped shape,

According to the invention, the device comprises at least one high pressure fluid inlet (210), a high pressure fluid outlet (220), a low pressure fluid inlet (230) and a low pressure fluid outlet (240) grouped together. in a connection area (510) arranged near a corner of said unit module.

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Heat exchange device and corresponding air conditioning circuit

TECHNICAL AREA

The field of the invention is that of air conditioning circuits operating with a refrigerant.

More particularly, the invention relates to a device which incorporates both an evaporator and an internal heat exchanger having characteristics making it suitable for optimized integration in an air conditioning circuit.

The invention has numerous applications, in particular but not exclusively in the automotive field where the constraints linked to the size of the on-board equipment are significant.

TECHNOLOGICAL BACKGROUND

We know the air conditioning circuits operating with a refrigerant.

Such a circuit typically comprises, in the direction of circulation of the coolant, a compressor, a condenser, an evaporator, a pressure reducer and an accumulator.

To improve the performance of the evaporator, it is known to provide an internal heat exchanger in the air conditioning circuit. An internal exchanger is a device allowing the refrigerant to exchange heat with this same fluid, but in a different temperature and pressure state.

The high pressure refrigerant, coming from the compressor, is condensed in the condenser and then passes into a first part of the internal exchanger. Then, the refrigerant is expanded by the expansion valve. The low pressure refrigerant leaving the expansion valve then passes through the evaporator, to be evaporated there, then through the accumulator, and in a second part of the internal heat exchanger, before returning to the compressor.

In the internal exchanger, the hot fluid at high pressure exchanges heat with the cold fluid at low pressure. In other words, the internal exchanger provides heat exchange of the refrigerant at two different points in the air conditioning circuit.

The evaporator produces a flow of cold air, or air conditioning, which can be sent, for example, into the passenger compartment of a motor vehicle.

However, it appears that an air conditioning circuit comprises a large number of active elements, that is to say capable of modifying the pressure and temperature conditions of the refrigerant, as well as a large number of connecting parts. connecting in communication the fluid of the different active elements to each other.

It is thus known to provide devices in which the evaporator and the internal heat exchanger are in the form of a unitary module. Thus, the overall size of the device is reduced, as well as the manufacturing cost. Furthermore, such an arrangement makes it possible to reduce the number of connecting pieces and therefore the risk of leakage from the overall system.

Among the internal heat exchangers encountered, those based on a stack of plates are commonly used due to the integration capacities offered by this technology while offering good heat transfer performance between the hot fluid at high pressure and the cold fluid at low pressure.

However, for reasons of simplicity of manufacture, the inlet and outlet of the high pressure fluid from the internal heat exchanger as well as the inlet and outlet of the low pressure fluid are often found to be arranged in diametrically opposite locations d '' an end plate of the internal heat exchanger. However, it appears that such an arrangement is not optimal for integrating the overall air conditioning circuit, for example in a motor vehicle.

There is thus a need for a device comprising an evaporator and an internal heat exchanger in the form of a unitary module and allowing better integration with the other elements of the air conditioning circuit than the known devices allow.

ABSTRACT

To remedy at least in part some of the drawbacks of the prior art, the invention relates to a heat exchange device for an air conditioning circuit operating with a refrigerant, and comprising an evaporator and an internal heat exchanger placed under the shape of a unit module of substantially parallelepiped shape.

According to the invention, the device comprises at least one high-pressure fluid inlet, a high-pressure fluid outlet, a low-pressure fluid inlet and a low-pressure fluid outlet grouped together in a connection zone arranged near a corner. of said unit module.

Thus, the invention proposes a new and inventive solution to facilitate the integration of a heat exchange device, comprising an evaporator and an internal heat exchanger put in the form of a unitary module, in an air conditioning circuit. full.

To do this, the invention proposes to group in the upper part (ie in the part which is arranged upwards when the heat exchange device is mounted in a vehicle) the four high and low pressure inlet / outlet pipes. of the two circuits for internal circulation of the coolant in its two pressure states.

More specifically, it is noted that the unitary module has a front face and a rear face separated by a peripheral wall comprising an upper wall and a lower wall connected on either side by a side wall. The connection area is located at one end (top) of one of these side walls.

As a result, the connection of the heat exchange device to the complete air conditioning circuit is simplified for the operator, in particular the connection with the regulator. The latter element can thus be easily positioned, for example through the bulkhead of a vehicle as is conventionally the case.

According to one embodiment of the invention, the fluid inlets and outlets are distributed in pairs one above the other.

In a variant of the invention, said internal exchanger essentially consists of a stack of tanks, said tanks belonging alternately:

• a high pressure internal circulation circuit of said refrigerant in a high pressure state; and • a low pressure internal circulation circuit of said refrigerant in a low pressure state;

a reservoir of the high pressure internal circulation circuit, called a high pressure reservoir, having at least one high pressure inlet port and at least one high pressure outlet port of said refrigerant in a high pressure state, a reservoir of the internal circulation circuit low pressure, said low pressure tank, having at least one low pressure inlet and at least one low pressure outlet of said refrigerant in a low pressure state, said internal exchanger further comprising an end plate comprising means junction making it possible to connect in fluid communication at least one of said high pressure orifices and / or at least one of said low pressure orifices to at least one of said high pressure fluid inlet, high pressure fluid outlet, low pressure fluid inlet and low pressure fluid outlet grouped in said connection area.

Thus, such an end plate according to the technique described can be adapted to a conventional internal exchanger, thus making it possible to group the high and low pressure inlets / outlets of the two coolant circuits in its two pressure states in the same zone. connection with a minimum of modification of the other elements present in the heat exchange device. The cost of the proposed solution is thus controlled.

In a particular embodiment of the device:

• said at least one high pressure inlet and outlet ports are arranged near a first end of said high pressure tank; and • said at least one low pressure inlet and outlet ports are arranged near a second end of said low pressure tank;

said first end of said high pressure tank being disposed opposite a first end of said low pressure tank which is opposite to said second end of said low pressure tank, said junction means making it possible to connect at least one of said high pressure orifices in fluid communication or at least one of said low pressure ports to at least one of said high pressure fluid inlet, high pressure fluid outlet, low pressure fluid inlet and low pressure fluid outlet grouped in said connection zone.

Thus, the technique described applies to an internal exchanger with circulation of the “U” type refrigerant.

According to another aspect of at least one embodiment of the invention:

• said at least one high pressure inlet port is disposed near a first end of said high pressure tank and said at least one high pressure outlet port is disposed near a second end of said high pressure tank opposite to said first end of said high pressure tank; and • said at least one low pressure inlet port is disposed near a first end of said low pressure tank and said at least one low pressure outlet port is disposed near a second end of said low pressure tank opposite said first end of said low pressure tank, said first, respectively second, end of said high pressure tank facing said second, respectively first, end of said low pressure tank when said low pressure tank is adjacent to said high pressure tank in said stack, said junction means making it possible to connect at least one of said high pressure inlet and outlet ports and at least one of said low pressure inlet and outlet ports to fluid communication with at least one of said high fluid inlet pressure, high pressure fluid outlet, fluid inlet b low pressure and low pressure fluid outlet grouped in said connection area.

Thus, the technique described applies to an internal exchanger with circulation of the refrigerant of the “counter-current” type.

According to another embodiment of the device, said end plate is a stamped plate having at least one channel intended to cooperate with at least one face of one of said reservoirs so as to constitute at least one tube intended for the flow of said refrigerant, said joining means comprising said at least one tube.

According to another aspect of an embodiment of the invention, said internal exchanger has a depth of 38mm.

Thus, the heat exchange device can easily be integrated within a standard HVAC (for "Heating, Ventilation and Air-Conditioning") box.

According to another variant, said tanks consist of stamped plates brazed together.

According to another aspect, said tanks include heat exchange spacers of the "internal fin" type.

Thus, the calorie exchange is improved between the refrigerant in the low pressure state and the refrigerant in the high pressure state.

The invention also relates to an air conditioning circuit comprising a heat exchange device according to any one of the abovementioned embodiments.

LIST OF FIGURES

Other characteristics and advantages of the invention will appear on reading the following description, given by way of an indicative and nonlimiting example, and the appended drawings, in which:

Figure 1 is a diagram showing an air conditioning circuit; FIG. 2 illustrates a combined heat exchange assembly comprising an evaporator and an internal heat exchanger in the form of a conventional unitary module;

Figures 3a and 3b are schematic views of components of an internal heat exchanger of the "plate" type as well as an end plate according to an embodiment of the technique described;

Figure 4 is a schematic view of an internal heat exchanger of the "plate" type comprising an end plate according to another embodiment of the technique described;

Figure 5 is a schematic view of a heat exchange device in the form of a unitary module according to one embodiment of the technique described.

DETAILED DESCRIPTION OF THE INVENTION

In all the figures in this document, identical elements and steps are designated by the same reference.

The general principle of the technique described consists of a heat exchange device for an air conditioning circuit operating with a refrigerant and comprising an evaporator and an internal heat exchanger in the form of a unit module of substantially parallelepiped shape.

Such a heat exchange device comprises at least one inlet and one outlet for high pressure fluid, one inlet and one outlet for low pressure fluid grouped together in a connection zone arranged near a corner of the unitary module.

Thus, the connection with the regulator is simplified and the latter element can be easily positioned, for example through the bulkhead of a vehicle as is conventionally the case for such a heat exchange device.

We will now describe, in relation to Figure 1, the components of a conventional air conditioning circuit.

The air conditioning circuit 100 includes a compressor 103, a condenser 105, an internal heat exchanger 107, a pressure reducer 109, an evaporator 111 and a desiccant bottle 113, these various elements being connected to each other by connecting pieces, such as as tubes, tubing, pipes or the like, so as to ensure the circulation of coolant.

The refrigerant is typically a chlorinated and fluorinated fluid operating in a subcritical regime, such as the R-134a fluid, a mixture of HFO-1234yf and CF31, or any other refrigerant capable of operating in subcritical regime.

In Figure 1, arrows illustrate the circulation of the refrigerant. The refrigerant, sent by the compressor 103, passes through the condenser 105, from which it emerges in a state of high pressure and high temperature. The refrigerant then passes through the internal heat exchanger 107 using an internal circulation circuit called high pressure, then is expanded in the regulator 109. The fluid thus expanded is then conveyed to the evaporator 111, before joining the exchanger of internal heat 107 in a state of low pressure and low temperature, which it passes through using an internal circulation circuit called high pressure. The desiccant bottle 113 is interposed between the condenser 105 and the internal heat exchanger 107.

In the internal heat exchanger 107, the low pressure refrigerant coming from the evaporator 111 exchanges heat with this same high pressure refrigerant coming from the condenser 105. At the outlet of the internal heat exchanger 107, the fluid again gains compressor 103, and so on.

A description will now be given, in relation to FIG. 2, of the structure of a conventional combined heat exchange assembly comprising an evaporator 111 and an internal heat exchanger 107.

More particularly, such a combined heat exchange assembly is essentially composed of an evaporator 111 and an internal heat exchanger 107 joined to each other by means of respective contact faces so as to be put in the form of a unitary module 200. Thus, the overall size of the device is reduced, as well as the manufacturing cost.

Furthermore, such an arrangement makes it possible to reduce the number of connecting pieces and therefore the risk of leakage from the overall system.

The internal heat exchanger 107 is composed of a stack of tanks 207 connected together so as to constitute two circuits for the internal circulation of the refrigerant fluid.

The first of these two internal circulation circuits, known as the high pressure internal circulation circuit, is dedicated to the circulation of the refrigerant in a high pressure state, i.e. the refrigerant from the desiccant bottle 113 and destined for the regulator 109.

The second of these two internal circulation circuits, known as the low pressure internal circulation circuit, is dedicated to the circulation of the coolant in a low pressure state, i.e. the coolant coming from the regulator 109 and intended for the compressor 103.

To do this, a high pressure fluid inlet 210 makes it possible to connect, in fluid communication, the high pressure internal circulation circuit to the portion of the external circuit coming from the desiccant bottle 113.

Likewise, a high pressure fluid outlet 220 makes it possible to connect, in fluid communication, the high pressure internal circulation circuit to the portion of the external circuit leading the fluid to the regulator 109.

Furthermore, a low pressure fluid inlet 230 makes it possible to connect the low pressure internal circulation circuit in fluid communication to the portion of the external circuit coming from the pressure reducer 109.

Likewise, a low pressure fluid outlet 240 makes it possible to connect the low pressure internal circulation circuit in fluid communication to the portion of the external circuit leading the refrigerant fluid to the compressor 103.

However, for reasons detailed below in relation to FIG. 3a, it appears that in a conventional internal heat exchanger structure 107 as shown in FIG. 2, the inlet 210 and the outlet 220 of high pressure fluid on the one hand, and the inlet 230 and outlet 240 of low pressure fluid on the other hand, are arranged at different ends (ie in diametrically opposite places in practice) of an end face of the exchanger 107, which limits the possibilities of integration.

We will now describe, in relation to FIGS. 3a and 3b, the constituent elements of an internal heat exchanger 107 of the “plate” type as well as an end plate according to an embodiment of the technique described.

Such an internal heat exchanger 107 of the “plate” type consists of a superposition of stamped plates 307 brazed together so as to form the tanks 207.

The tanks 207 thus stacked belong alternately to the high pressure internal circulation circuit, and to the low pressure internal circulation circuit.

To do this, a reservoir of the high-pressure internal circulation circuit, called a high-pressure reservoir 207hp, has at least one high-pressure inlet port 310 as well as at least one high-pressure outlet port 320. Such orifices make it possible to put in fluid communication, the high pressure tank 207hp with the next high pressure tank in the stack.

In the embodiment illustrated in FIGS. 3a and 3b, the high pressure inlet 310 and high pressure outlet 320 ports are arranged on the same side of the high pressure tank 207hp, ie near a first end of the tank high pressure 207hp. In this way, a U-shaped circulation of the refrigerant in the high pressure state is obtained in the high pressure tank 207hp (circulation illustrated by the arrows 325 in FIG. 3a). More particularly, the circulation of the refrigerant in the high pressure state takes place via “U” tubes obtained by brazing stamped plates 307 therebetween.

Similarly, a tank of the low pressure internal circulation circuit, called a low pressure tank 207bp, has a low pressure inlet port 330 as well as a low pressure outlet port 340. More particularly, the low pressure inlet ports 330 and low pressure outlet 340 are arranged on the same side of the low pressure tank 207bp, ie near a second end of the low pressure tank 207bp. In this way, a U-shaped circulation of the refrigerant in the low pressure state is also obtained in the low pressure tank 207bp (circulation illustrated by the arrows 335 in FIG. 3a), via channels obtained by stamping the stamped plates 307.

Furthermore, the first end of the high pressure tank 207hp is opposite a first end of the low pressure tank 207bp which is opposite to the second end of the low pressure tank 207bp. In other words, the inlet ports 310 and outlet ports high pressure of the high pressure tanks are arranged opposite the inlet ports 330 and outlet 340 low pressure of the low pressure tanks in the stack of tanks 207 .

However, the high pressure fluid inlet 210, respectively the high pressure fluid outlet 220, of such an internal heat exchanger 107 must be connected in fluid communication to the high pressure inlet port 310, respectively the high pressure outlet port 320, from the high pressure end tank in the stack. Likewise, the low pressure inlet 230, respectively the low pressure outlet 240, of such an internal heat exchanger 107 must be connected in fluid communication to the low pressure inlet orifice 330, respectively the outlet orifice. low pressure 340, from the high pressure end tank in the stack.

It thus appears that in such a conventional structure of internal heat exchanger 107 in which the circulation of the fluid is of the “U” type, the inlet 210 and the outlet 220 high pressure on the one hand, and the inlet 230 and the low pressure outlet 240 on the other hand, are arranged at different ends (ie in diametrically opposite places in practice) of an end face of the exchanger 107, which limits the possibilities of integration of the device heat exchange thus obtained with the other elements of the air conditioning circuit 100.

We present below, in relation to FIGS. 3b to 5, a new technique which is the subject of the invention and which makes it possible to solve the problems of the conventional techniques mentioned above.

Thus, an end plate 300 is proposed comprising junction means which makes it possible to connect in fluid communication at least one of the inlet ports 310 or outlet 320 of high pressure fluid and / or at least one of the ports d inlet 330 or outlet 340 of low pressure fluid to at least one of the inlet of high pressure fluid 210, the outlet of high pressure fluid 220, the inlet of low pressure fluid 230 and the outlet of low pressure fluid 240 which are grouped in a connection area (510).

More particularly, the heat exchange device comprising the evaporator 111 and the internal heat exchanger 107 being put in the form of a unitary module (500) of parallelepiped shape, the connection zone (510) is arranged at proximity of a corner of the unitary module as described below in relation to FIG. 5.

Thus, the connection of the exchanger 107 with the external elements (i.e. the desiccant bottle 113, the regulator 109 and the compressor 103) is facilitated, in particular the connection with the regulator. The latter element can thus be easily positioned, for example through the bulkhead of a vehicle as is conventionally the case.

More particularly, in the embodiment illustrated in FIG. 3b, the end plate 300 comprises junction means making it possible to connect the fluid inlet port 310 as well as the high pressure outlet port 320 of the high pressure end tank in the tank stack 207 at the high pressure fluid inlet 210 and at the high pressure fluid outlet 220, respectively, from the internal heat exchanger 107.

In this embodiment, the end plate 300 is a stamped plate having at least one channel intended to cooperate with at least one face of one of said tanks so as to constitute at least one tube intended for the circulation of the refrigerant fluid. In this case, the joining means comprise this or these tubes.

In other embodiments, the end plate 300 comprises tubes or conduits previously integrated before attachment to the end tank 207 in the stack of tanks 207.

Furthermore, the tanks 207 include heat exchange spacers of the “internal fin” type 350 in order to optimize the heat exchanges between the refrigerant in its low pressure state and in its high pressure state.

We will now describe, in relation to FIG. 4, the constituent elements of an internal heat exchanger of the “plate” type as well as an end plate according to another embodiment of the technique described.

According to this embodiment, the stacked tanks 207 belong alternately to the high pressure internal circulation circuit (illustrated by the long and short alternating dotted arrows), and to the low pressure internal circulation circuit (illustrated by the long uniform dotted arrows) .

However, unlike the embodiment described above in relation to FIGS. 3a and 3b, the internal heat exchanger 107 according to the embodiment illustrated in FIG. 4 is of the "counter current" type.

To do this, a high pressure tank 207hp ', has a high pressure inlet port 310' disposed near a first end of this high pressure tank 207hp ', as well as a high pressure outlet port 320' arranged near a second end of the high pressure tank 207hp 'opposite its first end.

Similarly, a low pressure tank 207bp 'has a low pressure inlet port 330' disposed near a first end of this low pressure tank 207bp ', as well as a low pressure outlet port 340' arranged near a second end of the low pressure tank 207bp 'opposite its first end.

Furthermore, the first, respectively second, end of the high pressure tank 207hp 'is opposite the second, respectively first, end of the low pressure tank 207bp' when the low pressure tank 207bp 'in question is adjacent to the high pressure tank 207hp' in question in said stack.

In other words, high pressure tanks 207hp 'and low pressure tanks 207bp' arranged successively in the stack of tanks, appear "spade heads" when viewed from the point of view of their inlet and outlet orifices.

In this embodiment, the end plate 300 ′ comprises joining means making it possible to connect in fluid communication at least one of the high pressure inlet ports 310 ′ and of the high pressure outlet ports 320 ′ as well as at least one of the ports 330 'inlet and 340' low pressure outlet, at least one of the high pressure fluid inlet 210, the high pressure fluid outlet 220, the low pressure fluid inlet 230 and the low pressure fluid outlet 240 grouped in the connection area (510). Thus, the connection of the exchanger 107 with the external elements (ie the desiccant bottle 113, the regulator 109 and the compressor 103) is facilitated, the inputs / outputs having to be connected to these elements being grouped in the same connection area. .

More particularly, in the embodiment illustrated in FIG. 4, the end plate 300 ′ comprises joining means making it possible to connect the low pressure outlet orifice 340 ′ of the low pressure end tank in fluid communication. the stack at the low pressure fluid outlet 240 of the internal heat exchanger 107, as well as the high pressure inlet orifice 310 ′ of the end high pressure reservoir in the stack at the high fluid inlet pressure 210 of the internal heat exchanger 107.

In this embodiment, the end plate 300 ′ is a stamped plate having at least one channel 400 intended to cooperate with at least one face of one of said reservoirs so as to constitute at least one tube intended for the circulation of the fluid refrigerant. In this case, the joining means comprise this or these tubes. In other embodiments, the end plate 300 comprises tubes or conduits previously integrated before attachment to the end reservoir in the stack of reservoirs.

We will now describe, in relation to FIG. 5, a heat exchange device according to an embodiment of the technique described.

Such a heat exchange device in the form of a unitary module 500, here in a substantially parallelepiped shape, comprises an evaporator 111 and an internal heat exchanger 107 equipped with an end plate 300 ′ according to the invention.

In this way, the high-pressure fluid inlet 210, the high-pressure fluid outlet 220, the low-pressure fluid inlet 230 and the low-pressure fluid outlet 240 are grouped together in the connection area 510 arranged near d 'a corner of the unit module. Thus, the connection of the heat exchange device in the form of a unitary module 500 with the other elements of the air conditioning circuit 100 is facilitated. Similarly, the manufacture of an air conditioning circuit 100 based on such a heat exchange device 500 is facilitated compared to conventional solutions.

Note that the unitary module 500 has a front face and a rear face separated by a peripheral wall comprising an upper wall and a lower wall connected on either side by a side wall. The connection area 510 is located at one end (high) of one of these side walls formed by the end plate 300 '.

In one embodiment, the internal heat exchanger 107 has a depth of 38mm. Thus, it is possible to integrate a heat exchange device

500 comprising such an internal heat exchanger 107 within a standard HVAC box, without substantial modification of the latter.

The production of a motor vehicle comprising an air conditioning circuit 100 based on the use of a heat exchange device 500 according to the technique described is facilitated and has an improved cost compared to conventional techniques.

Indeed, the inputs and outputs to be connected being grouped together in the upper part of the device, the connection of the heat exchange device to the air conditioning circuit is simplified for the operator in this case.

Claims (10)

1. Heat exchange device for an air conditioning circuit (100) operating with a refrigerant, and comprising an evaporator (111) and an internal heat exchanger (107) in the form of a unitary module (500) of substantially parallelepiped shape, characterized in that it comprises at least one inlet for high pressure fluid (210), one outlet for high pressure fluid (220), one inlet for low pressure fluid (230) and one outlet for low pressure fluid (240) grouped in a connection area (510) arranged near a corner of said unit module. 2. Device according to claim 1, characterized in that the fluid inlets and outlets are distributed in pairs one above the other. 3. Device according to claim 1 or 2, characterized in that said internal exchanger (107) essentially consists of a stack of tanks (207, 207hp, 207bp, 207hp ', 207bp'), said tanks belonging alternately: • a high pressure internal circulation circuit of said refrigerant in a high pressure state; and • a low pressure internal circulation circuit of said refrigerant in a low pressure state; a tank of the high pressure internal circulation circuit, called a high pressure tank (207hp, 207hp '), having at least one high pressure inlet port (310, 310') and at least one high pressure outlet port (320, 320 ') of said refrigerant in a high pressure state, a reservoir of the low pressure internal circulation circuit, called a low pressure reservoir (207bp, 207bp'), having at least one low pressure inlet orifice (330, 330 ') and at at least one low pressure outlet port (340, 340 ') of said refrigerant in a low pressure state, said internal exchanger (107) further comprising an end plate (300, 300') comprising joining means making it possible to connect in fluid communication at least one of said high pressure ports or at least one of said low pressure ports to at least one of said high pressure fluid inlet, high pressure fluid outlet, low pressure fluid inlet and f outlet low pressure luide grouped in said connection area. 4. Device according to claim 3, characterized in that: • said at least one high pressure inlet (310) and outlet (320) orifices are arranged near a first end of said high pressure tank; and • said at least one low pressure inlet (330) and outlet (340) orifices are disposed near a second end of said low pressure tank; said first end of said high pressure tank being disposed opposite a first end of said low pressure tank which is opposite to said second end of said low pressure tank, said junction means making it possible to connect at least one of said high pressure orifices in fluid communication or at least one of said low pressure ports to at least one of said high pressure fluid inlet, high pressure fluid outlet, low pressure fluid inlet and low pressure fluid outlet grouped in said connection zone. 5. Device according to claim 3, characterized in that: • said at least one high pressure inlet port (310 ') is disposed near a first end of said high pressure tank and said at least one high pressure outlet port (320') is disposed near a second end of said high pressure tank opposite to said first end of said high pressure tank; and • said at least one low pressure inlet port (330 ') is disposed near a first end of said low pressure tank and said at least one low pressure outlet port (340') is disposed near a second end of said low pressure tank opposite said first end of said low pressure tank, said first, respectively second, end of said high pressure tank facing said second, respectively first, end of said low pressure tank when said low pressure tank is adjacent to said high pressure tank in said stack, said joining means making it possible to connect in fluid communication at least one of said high pressure inlet and outlet ports as well as at least one of said low pressure inlet and outlet ports, to at at least one of said high pressure fluid inlet, high pressure fluid outlet, inlet e low pressure fluid outlet and low pressure fluid gathered in said connecting zone. 6. Device according to any one of claims 3 to 5, characterized in that said end plate (300, 300 ') is a stamped plate having at least one channel (400) intended to cooperate with at least one face d one of said tanks so as to constitute at least one tube intended for the flow of said refrigerant, said joining means comprising said at least one tube. 7. Device according to any one of claims 1 to 6, characterized in that said internal exchanger (107) has a depth of 38mm. 8. Device according to any one of claims 3 to 7, characterized in that said tanks consist of stamped plates (307,307 ') brazed together. 9. Device according to any one of claims 3 to 8, characterized in that said tanks include heat exchange spacers of the type with "internal fins" (350). 10. Air conditioning circuit characterized in that it comprises a heat exchange device (500) according to any one of claims 1 to 9. 1/3 Fi ^ 2 2/3 350