WO2021209408A1

WO2021209408A1 - Heating, ventilation and/or air-conditioning device for a motor vehicle

Info

Publication number: WO2021209408A1
Application number: PCT/EP2021/059485
Authority: WO
Inventors: Philippe Pierres; Thierry Barbier; Cyril Gontier; Nestor Ismael VARELA SANTOYO
Original assignee: Valeo Systemes Thermiques
Priority date: 2020-04-15
Filing date: 2021-04-13
Publication date: 2021-10-21
Also published as: CN115427239A; FR3109334A1; EP4135989A1; FR3109334B1

Abstract

The invention relates to a heating, ventilation and/or air-conditioning device (2) for a motor vehicle, comprising a housing (4), said housing comprising: a first heat exchanger (6); - a bypass path (26) around the first heat exchanger (6); - a flap (34) inside the bypass path (26), characterized in that the housing (4) comprises a screen element (42) that is arranged at one end of the flap (34), said screen element (42) having a shape that is complementary to the movement path of the flap (34) and extending at least partially over a part of the movement path of the flap.

Description

HEATING, VENTILATION AND / OR AIR CONDITIONING DEVICE FOR MOTOR VEHICLES

[1] The present invention relates to a heating, ventilation and / or air conditioning device for a motor vehicle as well as on a motor vehicle comprising such a heating, ventilation and / or air conditioning device.

[2] A motor vehicle is commonly equipped with a ventilation, heating and / or air conditioning device to regulate the aerothermal parameters of an air flow distributed to the interior of the vehicle cabin. The device generally comprises a housing delimited by partitions in which openings are formed, including at least one air inlet and at least one air outlet.

[3] In known manner, the housing houses a blower to circulate the air flow from the air inlet to the air outlet. The housing also houses heat treatment means for heating and / or cooling the air flow prior to its distribution inside the passenger compartment. By way of example, the heat treatment means can comprise an evaporator which is intended to cool and dehumidify the flow of air passing through it, as well as a radiator, possibly associated with an additional radiator, which is intended to heat the flow. of air flowing through it.

[4] The heating, ventilation and / or air conditioning device, also known by its English name HVAC (for Heating, Ventilation and Air-Conditioning) can be supplied either with air outside the vehicle (also called fresh air), or with air. recycling, that is to say from the interior of the vehicle. In a known manner, a blower is used to circulate the air flow. This could be the flow of fresh or new air from the exterior of the vehicle or the flow of recirculation air from the interior of the vehicle or a mixture of the flow of exterior and recirculated air.

[5] It is important to be able to separate the air flows (outside air - recycling air), in particular when passing, from the air flows through the heating, ventilation and / or air conditioning system, depending on the needs of the occupants of the vehicle, or in other words during the thermal conditioning of the air flows. [6] Indeed, the recirculation air is already at a temperature close to the target temperature to be reached, it is thus possible to quickly reach the temperature desired by the user. However, the recirculation air is more loaded with humidity than the air coming from outside the vehicle, so if the recirculation air is directed near the windshield via air vents. , located in front of the driver or front passenger, for example, or directly on the windshield, the humidity in the recirculated air condenses on the windshield and creates mist.

[7] The outlet includes several ducts distributing the air flow to nozzles opening into different areas of the passenger compartment with in particular the defrost outlet leading the air flow to the defrost nozzle allowing the windshield to be defogged, the ventilation duct bringing the air flow towards the side / central ventilation nozzle allowing to cool / heat the passengers of the vehicle, as well as the foot duct directing the air flow towards the foot nozzle allowing to cool / heat the passengers' feet front / rear of the vehicle. There may also be a dedicated duct for the rear passengers of the vehicle.

[8] A known solution consists in thermally conditioning the flow of outside air and sending it into the passenger compartment near the windshield or directly on the latter, and in thermally conditioning the recirculation air flow in order to send it into the passenger compartment away from the windshield, at the level of the other air vents, such as the air vent outlets located at the level of the driver's or front passenger's feet. This is a double layer operating mode called "double layer" in English.

[9] However, it is observed in these known devices that too much hot air having passed through the radiator is directed towards the ventilation outlet resulting in that the temperature of the air flow for the foot outlet is equal. at the temperature of the air flow for the ventilation outlet. This results in a decrease in thermal comfort where generally it is better to have a higher temperature for the feet than for ventilation.

[10] The aim of the invention is to remedy this drawback.

[11] For this the invention provides a heating, ventilation and / or air conditioning device for a motor vehicle comprising a housing, said housing comprising:

- a first heat exchanger;

- a bypass path of the first heat exchanger;

- a shutter (34) arranged within the bypass path characterized in that the housing comprises a screen element arranged at one end of the shutter, said screen element being of a shape complementary to the stroke of the shutter and extending at least in part on part of the stroke of the shutter.

[12] The invention thus makes it possible to guarantee a better mixing of the air

[13] According to one of the aspects of the invention, the shutter is of the butterfly type and the screen element is arranged in the upstream part, with respect to the flow of an air flow, of the housing with respect to to the shutter.

[14] According to one aspect of the invention, the housing includes a second screen element arranged at the other end of the shutter.

[15] According to one aspect of the invention, the first screen element extends for at least 10% of the stroke of the shutter, preferably between 20% and 50% of the stroke of the shutter.

[16] According to one aspect of the invention, the second shielding element extends for at least 5% of the stroke of the shutter, preferably between 10% and 30% of the stroke of the shutter.

[17] According to one aspect of the invention, said housing comprises:

- a first flow duct for a first air flow;

- a second flow duct for a second air flow;

- a partition wall being arranged within the housing so as to separate the first flow duct from the second flow duct;

- the first heat exchanger being arranged in the first flow conduit and in the second flow conduit, said heat exchanger being common to the two flow conduits;

a second heat exchanger arranged downstream, with respect to the flow of an air flow, from the first heat exchanger and arranged within a single flow duct. [18] According to one of the aspects of the invention, the device comprises a third heat exchanger arranged upstream with respect to the flow of an air flow, to the first heat exchanger, the third heat exchanger being arranged in the first flow conduit and in the second flow conduit, said heat exchanger being common to the two flow conduits

[19] According to one of the aspects of the invention, the first flow duct of an air flow and the second flow duct of an air flow each comprise a bypass path of the first exchanger heat, the bypass paths being arranged on either side of the first heat exchanger.

[20] According to one of the aspects of the invention, a second flap is arranged within the first air flow duct and a third flap is arranged within the second air flow duct. an air flow, said flaps being arranged between the first and the third heat exchanger so as to direct each respective air flow through the corresponding bypass path and / or through the first heat exchanger.

[21] According to one of the aspects of the invention, the shutter pivots between two extreme positions, a first extreme position where said shutter abuts against the partition wall and / or the second heat exchanger and a second extreme position where said shutter abuts against a wall of the housing.

[22] According to one of the aspects of the invention, the first flap pivots in an intermediate position located between the two extreme positions with the guide wall of an air flow extending substantially in one direction and the first shutter comprising a door extending in one direction; in said intermediate position, said door being in the extension of the guide wall of an air flow.

[23] According to one of the aspects of the invention, the first flap pivots in an intermediate position located between the two extreme positions with the guide wall of an air flow extending in a direction D and the first shutter comprising a door which extends in a V direction; the D and V directions being substantially aligned in said intermediate position. [24] According to one of the aspects of the invention, in said intermediate position the space between the end of the guide wall of an air flow and the end of the first flap is between 5 and 25 mm, preferably between 10 and 15 mm.

[25] According to one aspect of the invention, the first shutter is able to close an inlet of an outlet duct when said shutter is positioned in the second extreme position.

[26] According to one of the aspects of the invention, the first flow duct of an air flow and the second flow duct of an air flow each comprise a bypass path of the first exchanger heat, the bypass paths being arranged on either side of the first heat exchanger.

[27] According to one of the aspects of the invention, a second flap, in particular a butterfly-type flap, is arranged within the first flow duct of an air flow and a third flap, in particular of the type sliding door, is arranged within the second flow duct of an air flow, said flaps being arranged between the first and third heat exchanger so as to orient each respective air flow through the corresponding bypass path and / or through the first heat exchanger.

[28] According to one aspect of the invention, the first air flow duct further comprises a fourth flap, in particular of the butterfly type, arranged within the corresponding bypass path.

[29] The invention also relates to a motor vehicle comprising a heating, ventilation and / or air conditioning device as described above.

[30] According to one aspect of the invention, said duct corresponds to the foot outlet and is configured to supply the foot area of the passenger compartment with air]

[31] It is understood that all of the above characteristics and configurations are in no way limiting. Other characteristics, details and advantages of the invention will emerge more clearly on reading the detailed description given below, and several embodiments given by way of indication and not by way of limitation with reference to the appended schematic drawings, in which: [32] Figure 1 [Fig. 1] illustrates a section in a profile view of the heating, ventilation and / or air conditioning device according to the invention according to an operating mode;

[33] Figure 2 [Fig. 2] illustrates a detailed plan of FIG. 1 of the device according to another mode of operation;

[34] Figure 3 [Fig. 3] illustrates, in a schematic side view, another part of the heating, ventilation and / or air conditioning system;

[35] Figure 4 [Fig. 4] illustrates a perspective view of another part of the heating, ventilation and / or air conditioning system;

[36] Figure 1 illustrates a heating, ventilation and / or air conditioning device 2 according to the invention comprising a housing 4 in which are housed means for heat treatment of the air flow intended to be distributed in the passenger compartment.

As illustrated in Figure 1, the housing 4 includes a first flow duct 4a for a first air flow Fa, and a second flow duct 4b for a second air flow Fb. However, the invention is not limited to this embodiment and can be applied to a housing comprising only a single duct for the flow of an air flow.

[37] According to the invention, the housing 4 comprises a partition wall 5 being arranged within the housing 4 so as to separate the first flow duct 4a from the second flow duct 4b.

[38] The heat treatment means comprise a first heat exchanger 6, for example a radiator, intended to heat part of the air flow circulating in the heating, ventilation and / or air conditioning device 2. The first heat exchanger 6 is arranged in the first flow conduit 4a and in the second flow conduit 4b, said heat exchanger 6 being common to the two flow conduits 4,4b.

[39] The heat treatment means also comprise a second exchanger 8, corresponding to an electric heater intended to heat the air flow more quickly, in particular in the case of starting the vehicle. The second heat exchanger 8 is arranged downstream with respect to the air flow of the first heat exchanger 6. The second heat exchanger is arranged within a single flow duct, here the second exchanger 8 is arranged exclusively within the second flow duct 4b.

[40] The heat treatment means also include a third heat exchanger 10, for example an evaporator, arranged upstream of the first heat exchanger 6 with respect to the direction of the flow of air flows. The third heat exchanger 10 is intended to cool and dehumidify the entire air flow circulating in the heater. The third heat exchanger 10 is arranged in the first flow conduit 4a and in the second flow conduit 4b, said heat exchanger 10 being common to the two flow conduits 4,4b.

[41] The air flow is introduced into the housing 4 through an inlet (not shown) and then is directed to an outlet, after having been heat treated by the heat exchangers 6, 8, 10 via a blower (not shown).

[42] The outlet comprises several ducts distributing the air flow to nozzles opening into different areas of the passenger compartment. The outlet comprises in particular a first outlet duct 12 directing the air flow towards the foot nozzle allowing the feet of the front and possibly rear passengers of the vehicle to be warmed. The outlet also includes a second outlet duct 14 conveying the flow of air to the defrost nozzle allowing the windshield to be defogged. The outlet includes a third outlet duct16 leading the air flow to the side / center ventilation nozzle for cooling / heating the front passengers of the vehicle. The outlet can also include a fourth outlet duct 18 to guide the flow of air to the rear area of the vehicle for cooling / heating the rear passengers of the vehicle. Each outlet duct includes an access port that can be closed at least partially by a shutter.

[43] According to the invention, the device comprises a fourth part 34 which will be described later.

[44] According to the invention, the device comprises a first flap 20 arranged downstream of the second heat exchanger 8 and abutting in an extreme position against the partition wall 5 or against the second heat exchanger 8. As illustrated in the [Fig.1], the first flap 20 is of the butterfly type, with namely that it comprises an axis of rotation arranged at the center of a door P or an axis of rotation arranged between two doors. The first flap 20 is arranged at the level of the first outlet duct 12. In other words, the first flap 20 is arranged so that it can at least partially close off the inlet mouth of the first outlet duct 12. As illustrated. in FIG. 1, the first flap 20 is of the butterfly type with an axis of rotation 20c arranged between two doors 20a, 20b which are here inscribed in two distinct planes. Obviously the two doors can be registered in the same plan. A first door 20a is suitable for closing off or freeing access to the first outlet duct 12. The second door 20b makes it possible to guide the flow of air leaving the first or second heat exchanger 6.8.

[45] The first flap 20 pivots between two extreme positions, a first extreme position where the first flap 20, and more precisely the second door 20b, abuts against the partition wall 5 and / or the second heat exchanger 8 and a second extreme position where the first flap 20, and more precisely the second door 20b, abuts against a wall of the housing 4. Obviously, the first flap 20 is able to adopt any intermediate position between these two extreme positions.

[46] In the first extreme position as illustrated in Figure 2, the first flap 20, and in particular the second door 20b abuts against the partition wall 5 while the first door 20a abuts against a wall of the housing 4, in particular a wall of the first outlet duct 12 so that the air flow that can circulate within the first outlet duct 12 is maximum.

[47] In the second extreme position illustrated in Figure 3, the first flap 20, and in particular the second door 20b abuts against a wall of the housing 4 and while the first door 20a completely closes the first outlet duct 12 so that an air flow cannot circulate within the first outlet duct 12.

[48] According to the invention, the heating, ventilation and / or air conditioning device further comprises a guide wall 22 of an air flow arranged in the first flow duct 4a of an air flow Fa and arranged downstream, by relative to the flow of an air flow, from the first heat exchanger 6. The guide wall 22 of an air flow orients the first air flow Fa in the direction of the first flap 20.

[49] Thus according to the invention the first flow of hot air Fa having passed through the first heat exchanger 6, is oriented in the direction of the first flap 20 and therefore towards the first outlet duct 12 towards the area of the feet in the passenger compartment.

[50] Because of this orientation, the majority of the flow of the first heated airflow Fa is directed towards the 12-foot outlet duct.

[51] However, according to the invention, most but not all of the flow of the first heated airflow Fa is directed toward the 12 foot outlet duct. Indeed, there is always a part of the first air flow Fa which can flow towards the second and / or third outlet duct 14,16.

[52] For this, the device 2 according to the invention, and in particular the housing 4, comprises a space 24, or an interstice, between the guide wall 22 of an air flow and the first flap 20 so as to that the first flap 20 is not able to come into abutment against the guide wall 22 of an air flow. In other words, according to the invention, the first flap 20 is configured so that the first flap 20 cannot bear against the guide wall 22 of an air flow.

[53] As seen above, the first flap 20 pivots into an intermediate position I as illustrated in Figure 1 located between the two extreme positions. The guide wall 22 of an air flow extends substantially in a direction P and the first flap and in particular the second door 20b extends substantially in a direction V. As illustrated in FIG. 1, the directions P and V are substantially aligned in this intermediate position. In other words, the second door 20b is in the extension of the guide wall 22 of an air flow, while maintaining a space 24 between the two elements.

[54] In said intermediate position, the space 24 between the end of the guide wall 22 of an air flow and the end of the first flap 20 and in particular the end of the second door 20b is between 5 and 25 mm, preferably between 10 and 15 mm. [55] Thus, by this gap 24, it is guaranteed that part of the first air flow Fa having passed through the first heat exchanger 6 can still be conveyed in the direction of the second and / or third outlet duct 14,16 .

[56] The first flow duct 4a of the first air flow Fa and the second flow duct 4b of the second air flow Fb each comprise a bypass path 26,28 of the first heat exchanger 6, the paths bypass 26, 28 being arranged on either side of the first heat exchanger 6.

[57] According to the invention, a second flap 30 of the butterfly type is arranged within the first flow duct 4a of the first air flow Fa and a third flap 32 of the sliding door type is arranged within the second duct d 'flow 4b of the second air flow Fb, said flaps being arranged between the first 6 and third 10 heat exchanger so as to orient each respective air flow Fa, Fb through the corresponding bypass path 26,28 and / or through the first heat exchanger 6.

[58] In other words, the second flap 30 of butterfly type pivots between two extreme positions and can adopt any intermediate position, a first extreme position where the second flap 30 completely blocks the passage of the air flow Fa to access the first heat exchanger. heat 6, and a second extreme position where the second flap 30 maximally frees the passage of the air flow Fa to access the first heat exchanger 6. The first flow duct 4a of the first air flow Fa further comprises another flap, therefore a fourth flap 34 also of butterfly type arranged within the bypass path 26 of the corresponding first heat exchanger 6. The fourth flap 34 pivots between two extreme positions and can adopt any intermediate position, a first extreme position where the fourth flap 34 completely blocks the bypass path 26 of the first heat exchanger 6 and a second extreme position where the fourth flap 34 s' at least opposes the flow of the first air flow Fa within the bypass path 26.

[59] According to the invention, the housing 4 comprises a screen element 42 arranged at one end of the fourth flap 34. Said screen element 42, commonly called nose progressive, is of complementary shape to the stroke of the fourth flap 34 and extends at least in part over part of the stroke of the flap. In other words, the housing 4 comprises a screen element 42, or a mask, which follows the curvilinear trajectory of the fourth flap 34. It can also be said that the screen element 42 is at least partially concave with the fourth flap moving. within the concave part. Indeed, the fourth flap 34 corresponds to a butterfly flap pivoting around an axis of rotation arranged between two doors or at the center of a single door, so that the door or doors adopt a circular path and pivot in a extreme position where they abut against the housing 4 to prevent the flow of the air flow through the bypass path 26 at another extreme position where they least oppose the flow of the air flow.

[60] By opening, or pivoting a few degrees, the fourth shutter 34, this creates a call for air where the cold air is sucked towards the distribution, which does not promote good mixing with the hot air. The result is that the defrost outlet or the ventilation outlet is colder than the set temperature given by the occupants of the vehicle.

[61] The screen element 42 therefore makes it possible to generate a dead zone in order to better calibrate the quantity of cold air for the temperature progression.

[62] According to the invention, the fourth flap 34 is of the butterfly type and the screen element 42 is arranged in the upstream part, with respect to the flow of an air flow, of the housing 4 with respect to the fourth flap 34. In other words, the screen element 42 is arranged between the fourth flap 34 and the third heat exchanger 10, with respect to the flow of an air flow.

[63] According to the invention, the housing 4 comprises a second screen element 45 arranged at the other end of the shutter 34. Likewise, the second screen element has a shape complementary to the path of the shutter door, otherwise said at least partially concave, so as to also generate a dead zone.

[64] As illustrated in Figure 1, the second screen element 45 is formed by a set of united or one-piece walls which also further form the guide wall 22. [65] According to the invention, the first screen element 42 extends over at least 10% of the stroke of the shutter, preferably between 20% and 50% of the stroke of the shutter.

In other words, if the fourth flap 34 pivots in an angle range between [0 °, 100 °], in this case, the concave part of the screen element 42 extends at least in the angle range included between] 0 °, 10 °], preferably between] 0 °,

20 °] or even up to an angle range between] 0 °, 50 °] and any intermediate values.

[66] According to the invention, the second screen element 45 extends over at least 5% of the stroke of the shutter, preferably between 10% and 30% of the stroke of the shutter. In other words, the concave part of the second screen element 45 extends at least in the angle range between] 0 °, 10 °], preferably between] 0 °, 10 °] or even up to an angle range. between] 0 °, 30 °] and all intermediate values.

[67] The third shutter 32 of the sliding door type slides between two extreme positions and can adopt any intermediate position, a first extreme position where the third shutter 32 completely blocks the passage of the air flow Fa to access the first heat exchanger 6 and a second extreme position where the third flap 32 completely blocks the corresponding bypass path 28.

[68] Obviously, the invention is not limited to the type of shutter for the first, second, third or fourth shutter 20, 30, 32, 34. Each shutter can correspond to a butterfly shutter, drum, flag (axis of rotation arranged at one end of a door), or else sliding door.

[69] As explained above, each outlet duct 12,14,16,18 includes an associated shutter which allows each air flow Fa, Fb to flow or not within the outlet duct.

[70] The first flap 20 is associated with the first outlet duct 12. A fifth flap 36 here of flag type is associated with the second outlet duct 14 directing the air towards the de-icing nozzle near the windshield of the vehicle. The fifth flap 36 is able to completely close the second outlet duct 14. A sixth flap 38 here of the drum type is associated with the third outlet duct 16 directing the air towards the central / lateral ventilation nozzle. The sixth flap 38 is such that it is not able to completely close off the third outlet duct 16. In fact, the sixth flap 38 includes notches (not shown) on these lateral sides so as to always guarantee an air leak from the order of 10% of the maximum flow even when the sixth flap 38 is in the extreme closed position of the third outlet duct 16. In addition a seventh flap 40, here of the butterfly type, associated with the fourth outlet duct 18 directing the air to the passenger ventilation nozzle at the rear of the vehicle. The seventh flap 40 is able to completely close the fourth outlet duct 18.

[71] The structure of the sixth flap 38 ensures that an air flow can always be directed in the direction of the side windows of the vehicle and allow defrosting or defogging thereof. This is particularly advantageous in the defrost mode (cf. [0062]), where the sixth ventilation flap 38 is in the extreme closed position, but the vehicle windows can still be defrosted or demisted.

[72] The first, fifth, sixth and seventh components are called the distribution components and the second, third and fourth components the mixing components.

[73] The device 2 according to the invention may include a shutter synchronization mechanism where the seventh shutter 40 can be linked in rotation with the sixth shutter 38, for example by means of a connecting rod.

[74] Such an arrangement of the heating, ventilation and / or air conditioning device 2 according to the invention makes it possible to use several operating modes as described below. Only the distribution flaps will be described, the mixing flaps depending on the temperature setpoints indicated by the front and / or rear passengers.

[75] Foot mode: In foot mode, as illustrated in FIG. 2, the first flap is in the open position of the first outlet duct 12, in other words, the first flap 20 is in abutment against the partition wall 5 and / or against the second heat exchanger 8. The fifth flap 36 is in the partially closed position (80% closed), the sixth flap 38 is in the closed position of the third outlet duct 16, with leaks from air representing up to 10% of the maximum flow rate and the seventh flap is in the fully closed position of the fourth outlet duct 18. [76] Bi-level mode: in this mode, the first flap 20 is in the intermediate position I where the second door 20b is in the extension of the guide wall 22 of the first heated air flow Fa, as illustrated in FIG. 1 The fifth flap 36 is in the closed position of the second outlet duct 14 and the sixth 38 and seventh 40 flaps are in the intermediate open position, that is to say between the closed position and the position d. opening of each corresponding outlet duct 16,18, although the sixth flap 38 may be in the fully open position.

[77] Feet / degi mode: in this mode, the first 20 and fifth 36 flaps are in the intermediate position and the sixth 38 and seventh 40 flaps are in the closed position of each corresponding outlet duct 16,18, with the leaks air for the sixth flap 38.

[78] Ventilation mode: the sixth 38 and seventh 40 flaps are in the open position of each corresponding outlet duct 16,18 and the first 20 and fifth 36 flaps are in the closed position of each outlet duct 12,14 corresponding

[79] Defrost mode: Only the fifth flap 36 is in the open position of the outlet duct 14, the other distribution flaps are in the closed position of each corresponding duct.

[80] The following table summarizes the different modes. For each mode, feet, defrost, etc. There are two lines, the first line corresponds to the degree of opening (percentage) of the shutter indicated, with 100 corresponding to the degree of maximum opening, in other words the extreme position where the shutter is least opposed to the flow of 'an air flow and 0 corresponding to the degree of obstruction of the corresponding duct are entered on the left and the shutters are written according to their degree of opening and flow rate passing through these shutters. The second line corresponds to the air flow circulating within the corresponding air duct (percentage relative to the total air flow).

operation and to have more hot air in the direction of the feet.

[82] Figure 3 illustrates the air inlet box the device comprising an air inlet box and a blower (or motor-fan unit (GMV) or even blower), namely with a single turbine, in other words a paddle wheel,

54 capable of being driven in rotation about an axis A. The device 2 comprises a tubular member 56 capable of delimiting a first air circulation channel 58 allowing the flow of a first air flow intended to pass through a first axial part of the turbine 54b and a second air circulation channel 60 allowing the flow of a second air flow intended to pass through a second axial part of the turbine 54a. The tubular member 56 is mounted at the location of a first end of said turbine 54 and delimits an internal space, or volume, forming at least part of the first air circulation channel 58, the second air circulation channel d The air 60 extending outside the tubular member 56. The device 2 further comprises an air inlet housing covering the first end of the turbine 54 and the tubular member 56. The housing air inlet comprises guide means capable of directing a first air flow in the first air circulation channel 58, and to direct a second airflow in the second air circulation channel 60. The axial parts of the turbine 54a, 54b can for example be made with reference to the axis vertical of the vehicle, when the device is installed in the vehicle.

[83] For this, the air inlet box may for example comprise a first and second air inlet openings, one for recirculation air and one for fresh air, and three drum flaps having coaxial axes of rotation. The central drum flap is arranged to allow aeraulic communication between the air inlets and the first air circulation channel 58. The two side drums are arranged to allow aeraulic communication between the air inlets and the air inlet. second air circulation channel 60. The air inlet housing 14 may further include an air filter intended to be passed through by the first and the second air stream.

[84] The turbine 54 is arranged in a volute 62 whose outlet comprises the two flow conduits 4a, 4b separated by the partition wall 13 corresponding to a part of the partition wall 5. In other words, the first channel of air circulation 58 directs the air flow towards a first axial part of the turbine 54b and thus opens into the second flow duct 4b, while the second air circulation channel 60 directs the air flow towards the second axial part 54a of the turbine 54 and thus opens into the first flow duct 4a.

[85] The air blower, that is to say the one or more blades 54 is contained in a part of the casing in the form of a spiral, commonly called volute 62. The air flows sucked in by the one or more finned wheels 54 are oriented towards the walls of the volute 62 and thus follow the circular path defined by these walls. The volute 62 then has a volute outlet in the form of a rectilinear duct so that the air flows leaving the volute 62 follow this same direction.

[86] The part of the housing 4 positioned between the outlet of the volute 62 and the distribution is commonly called the divergent. The divergent corresponds to a channel in which the air flow leaving the volute 62 is conveyed to the third heat exchanger 10, here the evaporator 10. [87] The device 2 comprises a partition wall 5 separating, or delimiting, the two flow conduits 4a, 4b from one another. This partition wall can be in one piece and extend within the heating, ventilation and / or air conditioning device 2 with orifices to allow the introduction of the various heat exchangers 6,8,10 or the partition wall can be in several parts, or modules. There may be a first part 13 extending between the blower and the evaporator 10, a second part 5 extending between the third 10 and the first 6 heat exchanger, a third extending above the second exchanger heat 8.

[88] The partition wall 5 according to the invention is not limited to a particular shape. The partition wall corresponds to an element making it possible to separate or delimit the two flow conduits 4a, 4b. As illustrated in Figures 1 and 3, the first part corresponds to a flat wall. The second part corresponds here to a block, that is to say a set of walls defining a non-planar or uneven shape, with stop elements against which the second component 30, mixing, can come to rest or between housings to at least partially accommodate the third component 32, mixing. The third part corresponds to an Omega wall with a housing for accommodating the second heat exchanger 8 and a stop element against which the first flap 20 bears, and in particular the second door 20b.

[89] The device 2 may include an air inlet box 19 as illustrated in FIG. 4. Here the air inlet box 19 comprises at least two separate air inlets 15,17 and extending over a width (d2) of the air intake housing, and air guide members 77, 78, 79 configured to direct at least one flow of air intended to be admitted into the air intake housing 19.

[90] The air guide members comprise at least three coaxial flaps 77, 78, 79, including a central flap 77 and two side flaps 78, 79 arranged on either side of the central flap 77, said coaxial flaps 77 , 78, 79 are arranged between said two air inlet vents 15,17 separate from the air intake housing 19, movably about a single pivot axis 80. The central flap 77 extends over a portion of said width of the air inlet housing 19 greater than or equal to the portion of the width where the two side flaps extend 78, 79. [91] Said coaxial flaps 77,78,79 are of the drum type and are each arranged movable between a first extreme position, in which said flap 77,78,79 closes a first air inlet 15, and a second extreme position, in which said flap 77,78,79 closes the second air inlet 17. [92] In the demisting mode, the central flap 77 must in the first extreme position of closing the second air inlet 17. The flaps 78, 79 must be in the second extreme position of closing the first air inlet 15.

[93] In this way, the flow of fresh air FE can flow within the blower through the first air inlet 15 to be guided towards the inside of the tubular member 56 and terminate at the level of the blower. first axial part of the turbine 54b and thus open into the second flow duct 4b, and the recycle air flow FR can also flow into the blower through the side flaps 78,79 which guide the flow d recycling air FR in the direction of the outside of the tubular member 56 to end at the level of the second axial part of the turbine 54a and thus open out within the first flow duct 4a.]

Claims

[Claim 1] A heating, ventilation and / or air conditioning device (2) for a motor vehicle comprising a housing (4), said housing comprising:

- a first heat exchanger (6);

- a bypass path (26) of the first heat exchanger (6);

- a shutter (34) arranged within the bypass path (26) characterized in that the housing (4) comprises a screen element (42) arranged at one end of the shutter (34), said screen element (42) being of shape complementary to the stroke of the shutter (34) and extending at least in part over part of the stroke of the shutter.

[Claim 2] Device (2) according to claim 1, wherein the shutter (34) is of the butterfly type and the screen element (42) is arranged in the upstream part of the housing, with respect to the flow of a air flow, relative to the shutter (34).

[Claim 3] Device (2) according to claim 2, wherein the housing (4) comprises a second screen element (45) arranged at the other end of the shutter (34).

[Claim 4] Device (2) according to one of the preceding claims, in which the screen element (42) extends over at least 10% of the stroke of the shutter (34), preferably between 20% and 50% of the stroke of the shutter (34).

[Claim 5] Device (2) according to one of claims 3 or 4 dependent on 3, wherein the second screen element (45) extends over at least 5% of the stroke of the shutter (34), preferably between 10% and 30% of the stroke of the shutter (34).

[Claim 6] Device (2) according to one of the preceding claims, wherein said housing (4) comprises:

- a first flow duct (4a) for a first air flow (Fa);

- a second flow duct (4b) for a second air flow (Fb);

- a partition wall (5,13) being arranged within the housing (4) so as to separate the first flow duct (4a) from the second flow duct (4b);

- the first heat exchanger (6) being arranged in the first flow duct (4a) and in the second flow duct (4b), said heat exchanger (6) being common to the two flow ducts (4a, 4b);

- a second heat exchanger (8) arranged downstream, with respect to the flow of an air flow, of the first heat exchanger (6) and arranged within a single flow duct (4a, 4b).

[Claim 7] Device (2) according to claim 6, wherein the device (2) comprises a third heat exchanger (10) arranged upstream with respect to the flow of an air stream, at the first heat exchanger. heat (6), the third heat exchanger (10) being arranged in the first flow conduit (4a) and in the second flow conduit (4b), said heat exchanger (10) being common to the two conduits d 'flow (4a, 4b)

[Claim 8] Device (2) according to one of claims 6 or 7, wherein the first flow duct (4a) of an air flow and the second flow duct (4b) of an air flow. air each comprise a bypass path (26,28) of the first heat exchanger (6), the bypass paths (26,28) being arranged on either side of the first heat exchanger (6).

[Claim 9] Device (2) according to claim 8, wherein a second flap (30) is arranged within the first flow duct (4a) of an air flow and a third flap (32) is arranged. within the second flow duct (4b) of an air flow, said flaps being arranged between the first (6) and the third (10) heat exchanger so as to orient each respective air flow (Fa , Fb) through the corresponding bypass path (26,28) and / or through the first heat exchanger (6).

[Claim 10] Motor vehicle characterized in that it comprises a device (2) for heating, ventilation and / or air conditioning according to one of the preceding claims.