HEAT TREATMENT MODULE WITH EXPANSION LINK

Description

[0001] The present invention relates to the field of heat treatment systems within a vehicle and more particularly to a heat treatment module within such heat treatment systems. A heat treatment module according to the preamble of claim 1 is described in US patent 2016375745 A1.

[0002] Motor vehicles are commonly equipped with a refrigerant circuit and at least one heat transfer fluid circuit, both used to provide thermal treatment to various areas or components of the vehicle. It is known, in particular, to use the refrigerant circuit and / or the heat transfer fluid circuit to thermally treat an airflow directed into the passenger compartment of a vehicle equipped with such a circuit. In another application, the heat transfer fluid circuit is known to be used to cool components of the vehicle's powertrain, such as an electrical storage device, which is used to power an electric motor capable of propelling the vehicle. The thermal treatment system thus provides the energy needed to cool the electrical storage device during its operation.

[0003] The refrigerant and heat transfer fluid circulate within their respective circuits and interact through multiple heat exchangers, ensuring heat transfer between the two fluids. To improve the compactness of the heat treatment system, several of these heat exchangers can be grouped into a single heat treatment module. Since automakers are constantly striving to improve their vehicles, one objective for enhancing such heat treatment modules is to consolidate more components of the heat treatment system within these modules.

[0004] The present invention falls within this context by proposing a heat treatment module for a vehicle heat treatment system according to claim 1.1

[0005] Such a heat treatment module according to the invention thus allows for the integration of an expansion valve and three heat exchangers ensuring heat exchange either between the refrigerant and the heat transfer fluid, or within a refrigerant circuit itself, as is the case for the internal heat exchanger. This configuration allows the expansion valve to be integrated into the heat treatment module, thereby avoiding the need for a separate expansion valve and the associated piping required to connect it to the heat treatment module.

[0006] The first and second heat exchangers facilitate heat exchange between the refrigerant and the heat transfer fluid, performing several functions dependent on the refrigerant temperature. For example, within these heat exchangers, the heat transfer fluid can condense the refrigerant to facilitate its subsequent expansion through the expansion valve. In other examples, the refrigerant can cool the heat transfer fluid so that the latter can then perform either a thermal treatment function for the vehicle's powertrain components or cool the cabin air via the HVAC system.

[0007] The internal heat exchanger is specific to the refrigerant circuit. In other words, the internal heat exchanger allows heat exchange between two temperature levels of the refrigerant in order to regulate the temperature of the refrigerant and thus optimize the thermal performance of the refrigerant circuit.

[0008] The expansion valve is mechanically attached to at least the two heat exchangers in order to integrate it into the heat treatment module. Depending on the embodiment of the heat treatment module, the expansion valve provides a fluid connection between the two heat exchangers, or between one of the heat exchangers and the internal heat exchanger.

[0009] According to one feature of the invention, the first heat exchanger comprises a first pass configured to be traversed by the refrigerant fluid and a second pass configured to be traversed by the heat transfer fluid, the second heat exchanger comprising a first pass configured to be traversed by the refrigerant fluid and a second pass configured to be traversed by the heat transfer fluid, the internal heat exchanger comprising a first channel configured to be traversed by the refrigerant fluid at a first temperature and a second channel configured to be traversed by the refrigerant fluid at a second temperature different from the first temperature.

[0010] The temperature of the refrigerant varies depending on the pressure and the thermodynamic state of the fluid. Therefore, the terms "first temperature" and "second temperature" do not refer to temperatures in the physical sense, but rather to a first and second temperature level.

[0011] The heat exchange within the first heat exchanger occurs between the refrigerant circulating in the first pass and the heat transfer fluid circulating in the second pass. This heat exchange may serve to condense the refrigerant to facilitate its subsequent expansion in the expansion chamber.

[0012] As with the first heat exchanger, the heat exchange in the second heat exchanger occurs between the refrigerant circulating in the first pass and the heat transfer fluid circulating in the second pass. This heat exchange can take place between the heat transfer fluid and the expanded refrigerant to cool the heat transfer fluid so that it can subsequently cool the components of the vehicle's powertrain.

[0013] The internal heat exchanger is configured to exchange heat between the refrigerant circulating in the first channel and the refrigerant circulating in the second channel. As previously described, this heat exchange within the internal heat exchanger optimizes the temperature regulation of the refrigerant. The temperature difference between the first and second channels ensures the proper operation of this heat exchange.

[0014] According to one feature of the invention, at least the first pass of the first heat exchanger and at least the first channel of the internal heat exchanger form a first section configured for circulating the refrigerant at the first temperature. This first section extends from the refrigerant inlet of the heat treatment module to the expansion valve. The first section thus corresponds to the section where the refrigerant circulates at the highest temperature, which is the first temperature.

[0015] The first heat exchanger can thus both condense the refrigerant to facilitate its expansion, and possibly heat the heat transfer fluid so that the latter provides a heating function for the passenger compartment in the case where the associated heat treatment system has an indirect heat pump type configuration.

[0016] The internal heat exchanger also allows the refrigerant circulating at the first temperature to be cooled by means of a heat exchange carried out with the refrigerant circulating at the second temperature.

[0017] According to one feature of the invention, at least the first passage of the second heat exchanger and at least the second channel of the internal heat exchanger form a second section configured to circulate the refrigerant at the second temperature. This second section is arranged between the expansion valve and an outlet of the heat treatment module and ensures the circulation of the refrigerant at a low temperature, corresponding to the second temperature. Circulation in the first passage thus cools the heat transfer fluid circulating in the second passage. The cooled heat transfer fluid then flows out of the heat treatment module to cool the components of the vehicle's powertrain.The refrigerant circulating in the second section also circulates within the second channel of the internal heat exchanger, in order to participate in the heat exchange taking place in the internal heat exchanger as previously mentioned.

[0018] According to one feature of the invention, the expansion valve separates the first section from the second section within the heat treatment module. The expansion valve ensures that the refrigerant expands, corresponding to a decrease in pressure. This pressure decrease is accompanied by a decrease in temperature. Therefore, it is the expansion valve that allows the temperature of the refrigerant to vary from the first temperature to the second temperature, thus separating the first section from the second section.

[0019] According to the invention, the first heat exchanger and the second heat exchanger each comprise a heat exchange block at the end of which is disposed an upper wall for the first heat exchanger and an upper face for the second heat exchanger. The expansion element is located at the upper wall of the first heat exchanger and / or the upper face of the second heat exchanger. The upper wall of the first heat exchanger and the upper face of the second heat exchanger are arranged opposite the internal heat exchanger with respect to the heat exchange block of at least one of the heat exchangers. The heat exchange block corresponds to a structural zone of each of the heat exchangers within which its specific heat exchange takes place.The expansion member is arranged so as to be mechanically connected to both the upper wall of the first heat exchanger and the upper face of the second heat exchanger. The two heat exchangers can, for example, be in contact with the internal heat exchanger, with the upper wall of the first heat exchanger and the upper face of the second heat exchanger corresponding to the opposite side of the heat exchange block. According to one feature of the invention, the first heat exchanger includes an additional pass, the expansion member providing a direct fluid connection between the additional pass of the first heat exchanger and the first pass of the second heat exchanger. The additional pass allows the first channel of the internal heat exchanger to be fluidly connected to the expansion member by passing through the first heat exchanger via the additional pass.Unlike the first pass, there is no heat exchange with the refrigerant circulating in the additional pass. This additional pass allows a connection between the first channel of the internal heat exchanger and the first pass of the second heat exchanger via the expansion chamber.

[0020] According to one feature of the invention, the expansion valve is welded to the first and second heat exchangers. This feature can correspond to all embodiments of the heat treatment module according to the invention. For example, the welding could consist of brazing the expansion valve to the heat exchangers. The expansion valve can also be attached to the heat exchangers in another way, for example, by screwing.

[0021] According to one feature of the invention, the internal heat exchanger is projected onto a plane perpendicular to a plate stacking axis. This projection onto the plane perpendicular to the plate stacking axis is of an assembly formed by the first and second heat exchangers, which is included within the projection of the internal heat exchanger. Integrating the projection planes of the heat exchangers within the projection plane of the internal heat exchanger allows at least two dimensions of the heat treatment module to remain equal to the dimensions of the internal heat exchanger. This configuration enhances the compactness of the heat treatment module.

[0022] According to one feature of the invention, the second heat exchanger includes an additional passage fluidly connecting the second channel of the internal heat exchanger and the outlet of the heat treatment module. As with the additional pass, there is no heat exchange with the refrigerant circulating in the additional passage.

[0023] According to one feature of the invention, the first heat exchanger includes an additional pass fluidically connecting the second channel of the internal heat exchanger and the outlet of the heat treatment module. As with the additional pass, there is no heat exchange with the refrigerant circulating in the additional pass.

[0024] The features and advantages of the invention will become further apparent from the following description on the one hand, and from several illustrative and non-limiting examples of embodiments given with reference to the attached schematic drawings on the other hand, in which: [ fig 1 ] represents a first embodiment of a heat treatment module according to the invention, [ fig 2 ] represents a first example of the circulation of a refrigerant and a heat transfer fluid within the first embodiment of the heat treatment module, [ fig 3 ] represents a second example of the circulation of the refrigerant and the heat transfer fluid within the first embodiment of the heat treatment module, [ fig 4 ] represents a second embodiment of the heat treatment module according to the invention, [ fig 5 ] represents a first part of the circulation of the refrigerant fluid within the second embodiment of the heat treatment module not according to the invention, [ fig 6 ] represents a second part of the circulation of the refrigerant fluid within the second embodiment of the heat treatment module.

[0025] There figure 1 This represents a first embodiment of a heat treatment module 1 according to the invention. The heat treatment module 1 is part of a vehicle heat treatment system, said system being capable of simultaneously providing heat treatment for a vehicle passenger compartment and heat treatment for various components of the vehicle's powertrain. For this purpose, the heat treatment system comprises at least one refrigerant circuit and at least one heat transfer fluid circuit, and the heat treatment module 1 includes portions of these two circuits. The heat treatment module 1 is thus capable of circulating a refrigerant and a heat transfer fluid within itself. By way of example, the refrigerant may be a fluid of type R134a or R1234yf, and the heat transfer fluid may be glycol water.

[0026] The thermal treatment module 1 comprises a first heat exchanger 2, a second heat exchanger 3, and an internal heat exchanger 4, each performing a specific function to ensure the proper operation of the vehicle's thermal treatment system. The first heat exchanger 2 and the second heat exchanger 3 are configured to facilitate heat exchange between the refrigerant and the heat transfer fluid. The heat exchange within each of the heat exchangers 2 and 3 is specific to one or more functions of the thermal treatment system. The internal heat exchanger 4 facilitates heat exchange within the refrigerant circuit, but between two temperature levels of said refrigerant: a first temperature and a second temperature.Details concerning the circulation of the refrigerant and heat transfer fluid, as well as all heat exchanges occurring within the thermal treatment module 1, will be described later.

[0027] In order to allow the refrigerant to enter and exit the heat treatment module 1, the latter includes a refrigerant inlet 7 and a refrigerant outlet 8. On the figure 1 , the refrigerant inlet 7 is positioned at the first heat exchanger 2 and the refrigerant outlet 8 is positioned at the second heat exchanger 3, but these positions may vary depending on the circulation of the refrigerant within the heat treatment module 1.

[0028] Furthermore, the first heat exchanger 2 includes a heat transfer fluid inlet 9 and a heat transfer fluid outlet 10, while the second heat exchanger 3 includes an inlet port 11 and an outlet port 12. Unlike the refrigerant, the heat transfer fluid entering one of the heat exchangers 2, 3 circulates only within said heat exchanger 2, 3. Thus, the heat transfer fluid entering respectively via the heat transfer fluid inlet 9 or the inlet port 11 necessarily exits respectively via the heat transfer fluid outlet 10 or the outlet port 12.

[0029] The distinctive feature of the heat treatment module 1 according to the invention is that it also includes an expansion device 5 which ensures the expansion of the refrigerant fluid as it passes through the expansion device 5. As shown in the figure 1 The expansion valve 5 is mechanically connected to the first heat exchanger 2 and the second heat exchanger 3. This connection of the expansion valve 5 can be achieved, for example, by welding or screwing. The expansion valve 5 includes an electronic control unit 17 for controlling the expansion level of the refrigerant within the expansion valve 5.

[0030] Each heat exchanger 2, 3 comprises a heat exchange block 15 within which heat exchange between the refrigerant and the heat transfer fluid takes place. The first heat exchanger 2 comprises an upper wall 13, while the second heat exchanger 3 comprises an upper face 14. The upper wall 13 and the upper face 14 correspond to the wall and face opposite the internal heat exchanger 4 with respect to the heat exchange block 15 of each of the heat exchangers 2, 3. According to this first embodiment of the heat treatment module 1, the expansion element 5 is integral with the upper wall 13 of the first heat exchanger 2 and the upper face 14 of the second heat exchanger 3.

[0031] The first heat exchanger 2 and / or the second heat exchanger 3 and / or the internal heat exchanger 4 can be plate heat exchangers. On the figure 1 The three exchangers 2, 3, 4 are plate exchangers. Each of these plate exchangers comprises a plurality of plates 30 stacked one on top of the other along a stacking axis 31. The stacking axis 31 of the heat exchangers 2, 3 and of the internal heat exchanger 4 are parallel or substantially parallel to each other.

[0032] It is the stacking of plates 30 which allows the circulation of the refrigerant and the heat transfer fluid for the heat exchangers 2, 3, the latter circulating between the plates 30. Preferably, the circulation between the refrigerant and the heat transfer fluid for the heat exchangers 2, 3 and the circulation between the refrigerant at the first temperature and the refrigerant at the second temperature within the internal heat exchanger 4 is done alternately from one plate 30 to another, in order to optimize the heat exchange.

[0033] The first heat exchanger 2 and the second heat exchanger 3 each comprise a first end plate 32 and a second end plate 33, each corresponding to the extreme plates of each of the heat exchangers 2, 3. In other words, these end plates 32, 33 close the heat exchange block 15 at each of its ends. On the figure 1 The first terminal plate 32 of the two heat exchangers 2, 3 corresponds to the plate 30 opposite the internal heat exchanger 4 with respect to the heat exchange block 15, while the second terminal plate 33 of the two heat exchangers 2, 3 corresponds to the plate 30 opposite the internal heat exchanger 4. According to the first embodiment of the figure 1 , the expansion member 5 is therefore integral with each of the first terminal plates 32 of each of the heat exchangers 2, 3. The internal heat exchanger 4 also includes a body 16 also formed by a stack of plates 30 and which is closed by an end plate 34 which corresponds to the plate 30 arranged opposite the two heat exchangers 2, 3.

[0034] The internal heat exchanger 4 is inscribed in a projection P perpendicular to the stacking axis 31 of the plates 30 of said internal heat exchanger 4. It should be noted that a projection of the first heat exchanger 2 and the second heat exchanger 3 are included in the projection P of the internal heat exchanger 4. Such an arrangement makes it possible to improve the compactness of the heat treatment module 1.

[0035] There figure 2 and the figure 3 represent two examples of refrigerant and heat transfer fluid circulation within the first embodiment of the heat treatment module 1. For these two figures, the refrigerant and heat transfer fluid circulation is represented by lines of different thicknesses, the thickest lines corresponding to the refrigerant circulation within a first section 18, the thinnest lines corresponding to the refrigerant circulation within a second section 19 and the lines of intermediate thickness corresponding to the heat transfer fluid circulation.

[0036] As previously described, the refrigerant circulates in the heat treatment module 1 at two different temperatures. Thus, the refrigerant circulating in the first section 18 corresponds to the refrigerant at the first temperature, while the refrigerant circulating in the second section 19 corresponds to the refrigerant at the second temperature. The expansion valve 5 separates the first section 18 from the second section 19 because, by expanding the refrigerant, it changes from the first temperature to the second temperature, the first temperature being higher than the second temperature.

[0037] According to the first example of circulation illustrated in figure 2 The refrigerant enters the heat treatment module 1, specifically the first pass 20 of the first heat exchanger 2. The first section 18 begins at this first pass 20, where the refrigerant is at the first temperature. Simultaneously, the heat transfer fluid circulates in a second pass 21 of the first heat exchanger 2. The heat exchange taking place in the first heat exchanger 2 is therefore between the refrigerant circulating in the first pass 20 and the heat transfer fluid circulating in the second pass 21. In the first heat exchanger 2, the refrigerant is at a higher temperature than the heat transfer fluid. The purpose of this heat exchange is, in particular, to condense the refrigerant via the heat transfer fluid, thereby facilitating its expansion through the expansion valve 5.This heat exchange can also be used to heat the heat transfer fluid in an indirect heat pump configuration if this is the case for the associated thermal treatment system.

[0038] After circulating in the first pass 20, the refrigerant flows into the internal heat exchanger 4 via a first channel 24 in order to exchange heat with the refrigerant circulating in the second section 19. The heat exchange carried out in the internal heat exchanger 4 optimizes the thermal performance of the refrigerant circuit.

[0039] After passing through the first channel 24, the refrigerant returns to the first heat exchanger 2 and circulates within an additional pass 26. This additional pass 26 allows the first pass 24 to be fluidly connected to the expansion element 5. Thus, the refrigerant circulating in the additional pass 26 does not undergo heat exchange despite the fact that it passes through the first heat exchanger 2.

[0040] The refrigerant thus joins the expansion device 5 which, by expanding the refrigerant, makes the transition between the first section 18 and the second section 19.

[0041] The refrigerant exits the expansion valve 5 at the second temperature and flows through a first passage 22 arranged in the second heat exchanger 3. Simultaneously, the heat transfer fluid flows through a second passage 23 of the second heat exchanger 3. The heat exchange taking place in the second heat exchanger 3 is therefore between the refrigerant flowing in the first passage 22 and the heat transfer fluid flowing in the second passage 23. In the second heat exchanger 3, the refrigerant is at a lower temperature than the heat transfer fluid. The purpose of this heat exchange is, in particular, to cool the heat transfer fluid using the refrigerant.The cooled heat transfer fluid then circulates to one or more components of the vehicle's powertrain for thermal treatment, or to a heat exchanger in the HVAC system to cool the passenger compartment air. This heat exchange also allows for at least partial evaporation of the refrigerant to optimize the performance of the refrigerant circuit.

[0042] At the exit of the first passage 22, the refrigerant returns to the internal heat exchanger 4 but this time via a second channel 25. The heat exchange taking place within the internal heat exchanger 4 is therefore between the refrigerant circulating in the first channel 24 and the refrigerant circulating in the second channel 25.

[0043] After circulating within the second channel 25, the refrigerant exits the heat treatment module 1 via the second heat exchanger 3, through an additional passage 27. Just as with the additional pass 26, the refrigerant circulating in the additional passage 27 does not undergo heat exchange and simply allows the refrigerant to exit the heat treatment module 1. Having done this, the refrigerant can, for example, circulate to a compression device not shown.

[0044] There figure 3 represents a second example of circulation within the first embodiment of the heat treatment module 1. This second example of circulation differs from the first example of circulation only in that the refrigerant exits the heat treatment module 1 from the second channel 25. Thus, instead of passing through the additional passage as illustrated in the figure 2 The refrigerant passes back through the first heat exchanger 2 via an additional pass 28 in which, as with the additional pass 26, no heat exchange takes place. According to this example, the refrigerant outlet illustrated on the figure 1 on the second heat exchanger 3 must be positioned here at the level of the first heat exchanger 2.

[0045] There figure 4 represents a second embodiment of the heat treatment module 1. This second embodiment differs from the first embodiment by the position of the expansion member 5. Reference will therefore be made to the description of the figure 1 for everything concerning the characteristics common to both modes of embodiment.

[0046] The second embodiment differs from the first embodiment in that it includes a space 35 separating an assembly formed by the first heat exchanger 2 and the second heat exchanger 3 and the internal heat exchanger 4. The space 35 allows for the accommodation of a plurality of elements, notably the expansion member 5 which is therefore interposed here between the two heat exchangers 2, 3 and the internal heat exchanger 4. Thus, according to this second embodiment, the expansion member 5 is integral with the first heat exchanger 2, the second heat exchanger 3 and the internal heat exchanger 4, for example by welding.

[0047] It is also possible to observe that space 35 also houses a connection block 36. The latter ensures a fluidic connection between the first heat exchanger 2 and the internal heat exchanger 4 and thus allows the refrigerant fluid to pass through space 35.

[0048] According to the second embodiment, the expansion member 5 is secured to the second end plate 33 of the first heat exchanger 2 and the second heat exchanger 3. As mentioned previously, the second end plate 33 corresponds to the plate 30 of the first heat exchanger 2 and the second heat exchanger 3 arranged opposite the internal heat exchanger 4. Since the expansion member 5 is, according to this embodiment, in contact with the internal heat exchanger 4, said expansion member 5 is therefore secured to the end plate 34 of said internal heat exchanger 4.

[0049] There figure 5 schematically illustrates the circulation of the refrigerant within the first section 18, as well as the circulation of the heat transfer fluid within the first heat exchanger 2. Just as for the figures 2 And 3 the circulation of figures 5 And 6are represented by lines of different thicknesses, the thickest lines corresponding to the circulation of the refrigerant within the first section 18, the thinnest lines corresponding to the circulation of the refrigerant within the second section 19 and the lines of intermediate thickness corresponding to the circulation of the heat transfer fluid.

[0050] The refrigerant enters the first pass 20 of the first heat exchanger 2 via the refrigerant inlet 7, while the heat transfer fluid enters the second pass 21 via the heat transfer fluid inlet 9. As in the first embodiment, the heat exchange in the first heat exchanger 2 occurs between the refrigerant circulating in the first pass 20 and the heat transfer fluid circulating in the second pass 21. Following this heat exchange, the heat transfer fluid exits the first heat exchanger 2 via the heat transfer fluid outlet 10.

[0051] The refrigerant then enters the first channel 24 of the internal heat exchanger 4 via the connection block 36 mentioned previously. After participating in the heat exchange within the internal heat exchanger 4, the refrigerant can then directly enter the expansion valve 5. It is thus understood that the second embodiment of the heat treatment module 1, and particularly the arrangement of the expansion valve 5, eliminates the need for the additional pass, as in the first embodiment. The expansion valve 5 therefore allows a direct fluid connection between the first channel 24 of the internal heat exchanger 4 and the first pass of the second heat exchanger.

[0052] There figure 6 illustrates the continuation of the refrigerant circulation, that is, the second section 19 of the refrigerant circuit, after the refrigerant has been expanded by the expansion valve 5. The figure 6 It also illustrates that space 35, in addition to housing the expansion member 5 and the connection block, also houses a first connection element 37 and a second connection element 38 allowing the refrigerant to access the second channel 25 and exit from outside the heat treatment module 1. The first connection element 37 participates in the fluid connection between the first passage 22 and the second channel 25 as will be described later.

[0053] After being expanded by the expansion device 5, the refrigerant circulates within the first passage 22 of the second heat exchanger 3. The refrigerant being at the second temperature when circulating in the second section 19, it cools the heat transfer fluid circulating in the second passage 23 after entering via the inlet port 11 and before exiting via the outlet port 12.

[0054] The refrigerant, after being at least partially evaporated during the heat exchange in the second heat exchanger 3, exits the latter via the refrigerant outlet 8 and can, for example, circulate within an external pipe 29 until it reaches an accumulation device 6, external to the heat treatment module 1. The accumulation device 6 is suitable for containing a liquid fraction of refrigerant that has not been evaporated during the heat exchange in the second heat exchanger 3. The accumulation device 6 thus avoids the circulation of refrigerant in liquid form to the compression device, which is only suitable for compressing a small percentage of oil and refrigerant in liquid form mixed with the refrigerant in gaseous form.

[0055] Thus, only a small percentage of liquid refrigerant oil mixed with gaseous refrigerant exits the storage device and flows to the first connecting element 37 in order to circulate in the second channel 25. The first connecting element 37 therefore indirectly provides the connection between the first passage 22 and the second channel 25. The heat exchange in the internal heat exchanger 4 is carried out with the refrigerant circulating in the first channel, as illustrated in the figure 5 The refrigerant circulating in the second channel 25 then exits through the second connecting element 38 in order to reach the compression device, not shown.

Claims

1. Thermal treatment module (1) for a thermal treatment system of a vehicle, comprising a first heat exchanger (2), a second heat exchanger (3) and an internal heat exchanger (4), the first heat exchanger (2) and the second heat exchanger (3) both being configured to operate a heat exchange between a refrigerant fluid and a heat transfer liquid, the internal heat exchanger (4) being configured to operate a heat exchange between the refrigerant fluid subjected in the thermal treatment system to two different temperature levels, wherein the thermal treatment module (1) comprises an expansion device (5) at least integral with the first heat exchanger (2) and / or the second heat exchanger (3) characterized in that the first heat exchanger (2) and the second heat exchanger (3) each comprise a heat exchange block (15) at the end of which is arranged an upper wall (13) for the first heat exchanger (2) and an upper face (14) for the second heat exchanger (3), the expansion device (5) being arranged at the level of the upper wall (13) of the first heat exchanger (2) and / or the upper face (14) of the second heat exchanger (3), the upper wall (13) of the first heat exchanger (2) and the upper face (14) of the second heat exchanger (3) being arranged opposite to the internal heat exchanger (4) with respect to the heat exchange block (15) of at least one of the heat exchangers (2, 3).

2. Thermal treatment module (1) according to claim 1, wherein the first heat exchanger (2) comprises a first pass (20) configured to be traversed by the refrigerant fluid and a second pass (21) configured to be traversed by the heat transfer liquid, the second heat exchanger (3) comprising a first passage (22) configured to be traversed by the refrigerant fluid and a second passage (23) configured to be traversed by the heat transfer liquid, the internal heat exchanger (4) comprising a first channel (24) configured to be traversed by the refrigerant fluid at a first temperature and a second channel (25) configured to be traversed by the refrigerant fluid at a second temperature different from the first temperature.

3. Thermal treatment module (1) according to the preceding claim, wherein at least the first pass (20) of the first heat exchanger (2) and at least the first channel (24) of the internal heat exchanger (4) form a first section (18) configured to circulate the refrigerant fluid at the first temperature.

4. Thermal treatment module (1) according to the preceding claim, wherein at least the first passage (22) of the second heat exchanger (3) and at least the second channel (25) of the internal heat exchanger (4) form a second section (19) configured to circulate the refrigerant fluid at the second temperature.

5. Thermal treatment module (1) according to the preceding claim, wherein the expansion device (5) separates the first section (18) from the second section (19) within the thermal treatment module (1).