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

Abstract

A heating, ventilation and / or air conditioning device (2) for a motor vehicle is disclosed, comprising a housing (4) comprising: a first duct (4a) for a first air flow (Fa); a second duct (4b) for a second air flow (Fb); a partition (5, 13) placed inside the housing (4) so as to separate the first duct (4a) from the second duct (4b); a first heat exchanger (6) arranged in the first duct (4a) and in the second duct (4b), the heat exchanger (6) being common to both ducts (4a, 4b); a second heat exchanger (8) located downstream of the first heat exchanger (6) with respect to the direction of flow of the air flows and arranged within a single duct (4a, 4b); a first baffle (20) located downstream of the second heat exchanger (8); an air flow guide wall (22) arranged inside the first duct (4a), downstream of the first heat exchanger (6) and directing the first air flow (Fa) in the direction of the first baffle (20); characterized in that the housing (4) comprises a space (24) between the air flow guide wall (22) and the first baffle (20) such that the first baffle (20) does not abut against the air flow guide wall (22).

Description

Technical Field

[0001] The present invention relates to a heating, ventilation and / or air conditioning device for a motor vehicle, and to a motor vehicle including such a heating, ventilation and / or air conditioning device. Background Technology

[0002] Motor vehicles are typically equipped with heating, ventilation, and / or air conditioning systems to regulate the aerodynamic thermal parameters of airflow distributed toward the vehicle interior. These systems typically include a housing defined by a partition, with openings including at least one air inlet and at least one air outlet.

[0003] In a known manner, the housing houses a blower to direct airflow from an air inlet to an air outlet. The housing also houses a heat treatment device for heating and / or cooling the airflow before it is distributed into the vehicle interior. For example, the heat treatment device may include an evaporator for cooling and dehumidifying the airflow passing through it, and a radiator may be associated with an additional radiator for heating the airflow flowing through it.

[0004] Heating, ventilation, and / or air conditioning systems, abbreviated as HVAC, can supply air from outside the vehicle (also known as fresh air) or recirculated air, that is, air from inside the vehicle. In known methods, a blower is used to circulate the airflow. This can be a flow of fresh or new air from outside the vehicle, a flow of recirculated air from inside the vehicle, or a mixture of outside air and recirculated air.

[0005] It is important to be able to separate airflow (outside air - recirculated air) according to the needs of vehicle passengers, especially when the airflow passes through heating, ventilation and / or air conditioning units, or in other words, when the airflow is thermally regulated.

[0006] Specifically, because the recirculated air is already at a temperature close to the desired setpoint temperature, it is possible to quickly reach the user's desired temperature. However, recirculated air contains more moisture than air from outside the vehicle, which means that if the recirculated air is directed near the windshield, for example, through vents located in front of the driver or front passenger, or directly onto the windshield, the moisture contained in the recirculated air will condense on the windshield and create fog.

[0007] The outlet includes multiple ducts that distribute airflow to nozzles leading to various areas of the vehicle interior, and specifically includes a defrost outlet directing airflow toward defrost nozzles to defog the windshield, a ventilation duct directing airflow toward side / center ventilation nozzles for cooling / heating vehicle passengers, and a footwell duct directing airflow toward footwell nozzles for cooling / heating the feet of front / rear passengers. There may also be ducts specifically for rear-seat passengers.

[0008] One known solution is to thermally regulate the outside airflow and direct it into the interior near the windshield or directly onto the windshield, while thermally regulating the recirculated airflow to direct it into the interior away from the windshield through other vents (such as vents located at the driver's or front passenger's feet). This is a mode of operation known as "dual-layer".

[0009] However, in these known devices, it has been found that excessive amounts of hot air, already passing through the radiator, are directed towards the ventilation outlets. As a result, the temperature of the airflow destined for the footwell outlets is equal to the temperature of the airflow destined for the ventilation outlets. This leads to reduced thermal comfort, as the temperature in the footwell is typically higher than the ventilation temperature. Summary of the Invention

[0010] The purpose of this invention is to overcome this deficiency.

[0011] Therefore, the present invention provides a heating, ventilation and / or air conditioning device for a motor vehicle, comprising a housing, the housing comprising:

[0012] First flow channel for the first airflow;

[0013] A second flow conduit for the second airflow;

[0014] Separation baffles are arranged inside the housing to separate the first flow channel from the second flow channel;

[0015] A first heat exchanger is arranged in a first flow pipe and a second flow pipe, and the first heat exchanger is shared by the two flow pipes;

[0016] Specifically, the second heat exchanger is arranged downstream of the first heat exchanger relative to the flow of the airflow, and is arranged in a separate flow duct;

[0017] A first door is arranged downstream of the second heat exchanger; the door is capable of abutting against a separation partition or against the second heat exchanger at an extreme position.

[0018] An airflow guide wall is arranged in a first flow duct downstream of the first heat exchanger and directs the first airflow toward the first door.

[0019] The feature is that the housing has a space between the airflow guide wall and the first door, so that the first door cannot abut against the airflow guide wall.

[0020] Therefore, the present invention makes it possible to ensure that airflow is directed to a door that directs airflow toward the footwell outlet. However, the space created between the airflow guide wall and the door allows for the maintenance of the normal operating mode and the supply of hot air to both the ventilation and / or defrosting outlets, as well as the footwell outlet.

[0021] According to one aspect of the invention, the device includes a third heat exchanger arranged upstream of a first heat exchanger relative to the flow of the airflow, the third heat exchanger being arranged in a first flow channel and a second flow channel, the third heat exchanger being shared by the two flow channels.

[0022] According to one aspect of the invention, the door pivots between two extreme positions: in the first extreme position, the door abuts against the separation partition and / or the second heat exchanger, and in the second extreme position, the door abuts against the wall of the housing.

[0023] According to one aspect of the invention, the first door pivots to an intermediate position between two extreme positions, the wall for guiding airflow extends substantially in one direction, and the first door includes blades extending in one direction; in the intermediate position, the blades are located in a continuation of the airflow guiding wall.

[0024] According to one aspect of the invention, the first door pivots to an intermediate position between two extreme positions, the airflow guide wall extends in direction D, and the first door includes blades extending in direction V; directions D and V are substantially aligned in the intermediate position.

[0025] According to one aspect of the invention, in the intermediate position, the distance between the end of the airflow guide wall and the end of the first door is between 5 mm and 25 mm, preferably between 10 mm and 15 mm.

[0026] According to one aspect of the invention, when the first door is in the second extreme position, the first door is capable of closing the inlet of the outlet pipe.

[0027] According to one aspect of the invention, a first flow channel and a second flow channel of the airflow each include a bypass path that bypasses a first heat exchanger, the bypass path being arranged on each side of the first heat exchanger.

[0028] According to one aspect of the invention, a second door, particularly a butterfly door, is arranged in a first flow duct for airflow, and a third door, particularly a sliding blade door, is arranged in a second flow duct for airflow, the doors being arranged between the first and third heat exchangers to guide each corresponding airflow through a corresponding bypass path and / or through the first heat exchanger.

[0029] According to one aspect of the invention, the first flow conduit further includes a fourth gate, particularly a butterfly gate, disposed within the corresponding bypass path.

[0030] According to one aspect of the invention, the housing includes a shielding element disposed at one end of the door, the shielding element having a shape complementary to the travel of the door and extending at least partially over a portion of the travel of the door.

[0031] According to one aspect of the invention, the door is butterfly-shaped, and the shielding element is arranged in the upstream portion of the housing relative to the door and relative to the flow of air.

[0032] According to one aspect of the invention, the housing includes a second shielding element disposed at the other end of the door.

[0033] According to one aspect of the invention, the first shielding element extends over at least 10% of the door's travel, preferably over 20% to 50% of the door's travel.

[0034] According to one aspect of the invention, the second shielding element extends over at least 5% of the door's travel, preferably over 10% to 30% of the door's travel.

[0035] The present invention also relates to a motor vehicle including heating, ventilation and / or air conditioning devices as described above.

[0036] According to one aspect of the invention, the conduit corresponds to a footwell outlet and is configured to supply air to the footwell area inside the vehicle. Attached Figure Description

[0037] It should be understood that the set of features and configurations described above is by no means limiting. Other features, details, and advantages of the invention will become more apparent from the accompanying drawings, by reading the detailed description given below and several exemplary embodiments given in a non-limiting manner, in which:

[0038] Figure 1 This is a side sectional view showing a heating, ventilation and / or air conditioning unit according to the present invention in one operating mode;

[0039] Figure 2 yes Figure 1 A detailed view shows the device in another operating mode;

[0040] Figure 3 This is a schematic side view showing another part of the heating, ventilation and / or air conditioning unit;

[0041] Figure 4 This is a perspective view showing another part of the heating, ventilation and / or air conditioning unit. Detailed Implementation

[0042] Figure 1 A heating, ventilation, and / or air conditioning device 2 according to the present invention is shown, comprising a housing 4 that houses means for heat-treating airflow to be distributed to the interior of a vehicle. The housing 4 includes a first flow duct 4a for a first airflow Fa and a second flow duct 4b for a second airflow Fb.

[0043] According to the present invention, the housing 4 includes a separation partition 5 disposed inside the housing 4 to separate the first flow channel 4a from the second flow channel 4b.

[0044] The heat treatment apparatus includes a first heat exchanger 6, such as a radiator, for heating a portion of the airflow circulating in the heating, ventilation, and / or air conditioning unit 2. The first heat exchanger 6 is arranged in a first flow pipe 4a and a second flow pipe 4b, and the heat exchanger 6 is shared by the two flow pipes 4a and 4b.

[0045] The heat treatment apparatus may also include a second heat exchanger 8, corresponding to an electric radiator, for faster warming of the airflow, especially during vehicle start-up. The second heat exchanger 8 is arranged downstream of the first heat exchanger 6 relative to the airflow. The second heat exchanger is arranged within a single flow duct; in this case, the second heat exchanger 8 is arranged only within the second flow duct 4b.

[0046] The heat treatment apparatus also includes a third heat exchanger 10, such as an evaporator, which is arranged upstream of the first heat exchanger 6 relative to the flow direction of the airflow. The third heat exchanger 10 is used to cool and dehumidify all the airflow flowing through the heating apparatus. The third heat exchanger 10 is arranged in the first flow pipe 4a and the second flow pipe 4b, and the heat exchanger 10 is shared by the two flow pipes 4a and 4b.

[0047] The airflow is introduced into the housing 4 through the inlet (not shown), and after being heat-treated by heat exchangers 6, 8, and 10, it is directed to the outlet by means of a blower (not shown).

[0048] The outlet includes several ducts for distributing airflow to nozzle openings leading to different areas of the vehicle interior. Specifically, the outlet includes a first outlet duct 12 that directs airflow to footwell nozzles, thereby warming the feet of front-seat passengers and, possibly, rear-seat passengers. The outlet also includes a second outlet duct 14 that delivers airflow to defrost nozzles, thereby defogging the windshield. The outlet includes a third outlet duct 16 that delivers airflow to side / center ventilation nozzles, thereby cooling / heating front-seat passengers. The outlet may also include a fourth outlet duct 18 for directing airflow to the rear area of ​​the vehicle, thereby cooling / heating rear-seat passengers. Each outlet duct includes an inlet opening that can be at least partially closed by a shut-off door.

[0049] According to the invention, the device includes a first door 20 disposed downstream of the second heat exchanger 8 and abutting against the separation partition 5 or against the second heat exchanger 8 at an extreme position. Figure 1 As shown, the first gate 20 is butterfly-shaped, meaning it includes a rotating shaft arranged at the center of blade P or between two blades. The first gate 20 is located at the first outlet pipe 12. In other words, the first gate 20 is arranged such that it can at least partially close the inlet of the first outlet pipe 12. Figure 1 As shown, the first door 20 is butterfly-shaped, with a rotation shaft 20c arranged between two blades 20a and 20b, in which case the two blades are located in two different planes. Clearly, the two blades can be located in the same plane. The first blade 20a is capable of closing or opening the inlet of the first outlet duct 12. The second blade 20b is capable of guiding the airflow leaving the first or second heat exchanger 6, 8.

[0050] The first door 20 pivots between two extreme positions. In the first extreme position, the first door 20, more specifically the second blade 20b, abuts against the separation partition 5 and / or the second heat exchanger 8. In the second extreme position, the first door 20, more specifically the second blade 20b, abuts against the wall of the housing 4. Of course, the first door 20 can take any intermediate position between these two extreme positions.

[0051] In such Figure 2 In the first extreme position shown, the first door 20, especially the second blade 20b, abuts against the separation partition 5, while the first blade 20a abuts against the wall of the housing 4, especially against the wall of the first outlet pipe 12, so that the flow rate of air that can flow in the first outlet pipe 12 is maximized.

[0052] exist Figure 3In the second extreme position shown, the first door 20, especially the second blade 20b, abuts against the wall of the housing 4, while the first blade 20a completely closes the first outlet duct 12, so that no airflow can flow in the first outlet duct 12.

[0053] According to the invention, the heating, ventilation, and / or air conditioning device further includes an airflow guide wall 22, which is arranged in a first flow duct 4a for airflow Fa and downstream of the first heat exchanger 6 relative to the flow of the airflow. The airflow guide wall 22 directs the first airflow Fa toward the first door 20.

[0054] Therefore, according to the invention, the hot first airflow Fa that has passed through the first heat exchanger 6 is directed to the first door 20 and thus to the first outlet pipe 12 for use in the foot space area inside the vehicle.

[0055] As a result of this orientation, most of the flow of the heated first airflow Fa is directed to the foot space outlet pipe 12.

[0056] However, according to the present invention, the majority, but not all, of the heated first airflow Fa is directed to the foot space outlet duct 12. Specifically, a portion of the first airflow Fa is always able to flow to the second and / or third outlet ducts 14, 16.

[0057] For this purpose, the device 2 according to the invention, particularly the housing 4, has a space 24 or gap between the airflow guide wall 22 and the first door 20, such that the first door 20 cannot abut against the airflow guide wall 22. In other words, according to the invention, the first door 20 is configured such that the first door 20 cannot be supported on the airflow guide wall 22.

[0058] As previously mentioned, the first gate 20 pivots to... Figure 1 The intermediate position I shown is located between two extreme positions. The airflow guide wall 22 extends substantially along direction P, and the first door, and particularly the second blade 20b, extends substantially along direction V. Figure 1 As shown, directions P and V are substantially aligned at this intermediate position. In other words, the second blade 20b is in the continuation of the airflow guide wall 22, while leaving a space 24 between the two elements.

[0059] In the intermediate position, the space 24 between the end of the airflow guide wall 22 and the end of the first door 20 (particularly the end of the second blade 20b) is 5 mm and 25 mm, preferably between 10 mm and 15 mm.

[0060] Therefore, the existence of the gap 24 ensures that a portion of the first gas flow Fa that has passed through the first heat exchanger 6 can always be delivered toward the second and / or third outlet pipes 14, 16.

[0061] The first flow duct 4a for the first gas flow Fa and the second flow duct 4b for the second gas flow Fb each include bypass paths 26 and 28 that bypass the first heat exchanger 6, and the bypass paths 26 and 28 are arranged on both sides of the first heat exchanger 6.

[0062] According to the invention, a butterfly-shaped second door 30 is arranged in a first flow duct 4a for a first airflow Fa, and a sliding blade-type third door 32 is arranged in a second flow duct 4b for a second airflow Fb. The doors are arranged between a first heat exchanger 6 and a third heat exchanger 10 to guide each corresponding airflow Fa, Fb through corresponding bypass paths 26, 28 and / or through the first heat exchanger 6.

[0063] In other words, the butterfly-shaped second door 30 pivots between two extreme positions and can adopt any intermediate position. In the first extreme position, the second door 30 completely cuts off the passage of airflow Fa into the first heat exchanger 6, and in the second extreme position, the second door 30 maximizes the opening of the passage of airflow Fa into the first heat exchanger 6. The first flow duct 4a for the first airflow Fa also includes another door, namely, a fourth door 34, which is also butterfly-shaped and arranged in the corresponding bypass path 26 bypassing the first heat exchanger 6. The fourth door 34 pivots between two extreme positions and can adopt any intermediate position. In the first extreme position, the fourth door 34 completely cuts off the bypass path 26 bypassing the first heat exchanger 6, and in the second extreme position, the fourth door 34 minimizes the obstruction to the flow of the first airflow Fa within the bypass path 26.

[0064] The sliding blade type third door 32 slides between two extreme positions and can take any intermediate position. In the first extreme position, the third door 32 completely cuts off the passage for the airflow Fa to enter the first heat exchanger 6. In the second extreme position, the third door 32 completely cuts off the corresponding bypass path 28.

[0065] Obviously, the present invention is not limited to the types of the first, second, third, or fourth gates 20, 30, 32, 34. Each gate may correspond to a butterfly gate, a drum gate, a flag gate with an end hinge (the rotation axis is located at one end of the blade), or a sliding blade gate.

[0066] As previously mentioned, each outlet duct 12, 14, 16, 18 includes an associated shut-off valve that allows each gas flow Fa, Fb to flow or not flow within the outlet duct.

[0067] The first door 20 is associated with the first outlet duct 12. The fifth door 36, in this case a flag-shaped door with hinged ends, is associated with the second outlet duct 14, which directs air to defrost nozzles near the vehicle's windshield. The fifth door 36 is capable of completely closing the second outlet duct 14. The sixth door 38, in this case a drum-shaped door, is associated with the third outlet duct 16, which directs air to the central / side ventilation nozzles. The sixth door 38 cannot completely close the third outlet duct 16. Specifically, the sixth door 38 has a cutout (not shown) on its lateral side, thus always ensuring air leakage on the order of 10% of the maximum flow rate, even when the sixth door 38 is in the extreme position of closing the third outlet duct 16. Furthermore, the seventh door 40 (in this case a butterfly-shaped door) is associated with the fourth outlet duct 18, which directs air to ventilation nozzles for rear passengers. The seventh door 40 is capable of completely closing the fourth outlet duct 18.

[0068] The structure of the sixth door 38 ensures that airflow is always directed to the vehicle's side windows, allowing these windows to be defrosted or defogged. This is particularly advantageous in defrost mode (see

[0062] ), in which the sixth ventilation door 38 is in the ultimate closed position, but the vehicle's windows can still be defrosted or defogged.

[0069] The first, fifth, sixth, and seventh doors are called distribution doors or baffles, while the second, third, and fourth doors are called mixing doors or baffles.

[0070] The device 2 according to the invention may include a mechanism for synchronizing the doors, wherein the baffle of the seventh door 40 may be rotatably connected to the baffle of the sixth door 38, for example, via a linkage.

[0071] This arrangement of the heating, ventilation, and / or air conditioning unit 2 according to the invention means that several operating modes can be utilized, as described below. Only the distribution doors or baffles, and the mixed doors or baffles depending on the temperature setpoint indicated by the front and / or rear passengers, will be described.

[0072] Foot space mode: In foot space mode, such as Figure 2 As shown, the first door is in the position that opens the first outlet pipe 12, or in other words, the first door 20 is against the partition wall 5 and / or the second heat exchanger 8. The fifth door 36 is in the partially closed position (80% closed), the sixth door 38 is in the position that closes the third outlet pipe 16 and the air leakage reaches 10% of the maximum flow rate, and the seventh door is in the position that completely closes the fourth outlet pipe 18.

[0073] Dual-layer mode: In this mode, the first door 20 is in the middle position I, and the second blade 20b is located in the continuation of the guide wall 22, which guides the heated first airflow Fa, such as... Figure 1 As shown. The fifth door 36 is in the position that closes the second outlet pipe 14, while the sixth door 38 and the seventh door 40 are in the intermediate open position, that is, between the position that closes each of the corresponding outlet pipes 16, 18 and the position that opens them, although the sixth door 38 can be in the wide open position.

[0074] Footspace / Defrost Mode: In this mode, the first door 20 and the fifth door 36 are in the middle position, the sixth door 38 and the seventh door 40 are in the position that closes each of the corresponding outlet pipes 16, 18, and there is an air leak in the case of the sixth door 38.

[0075] Ventilation mode: The sixth door 38 and the seventh door 40 are in the position that opens each corresponding outlet pipe 16, 18, and the first door 20 and the fifth door 36 are in the position that closes each corresponding outlet pipe 12, 14.

[0076] Defrosting mode: Only the fifth door 36 is in the position that opens the outlet pipe 14, while the other distribution doors are in the position that closes each corresponding pipe.

[0077] The table below summarizes the various modes. For each mode, such as foot space and defrost, there are two rows. The first row corresponds to the degree of opening (percentage) of the indicated door, where 100 corresponds to the maximum opening degree, in other words, the limit position where the door's resistance to airflow is minimal, and 0 corresponds to the degree of closure of the corresponding duct. These are recorded on the left, along with the door's opening degree and the airflow through it. The second row corresponds to the airflow rate (percentage of total airflow) passing through the corresponding airflow duct.

[0078]

[0079]

[0080] Therefore, according to the present invention, multiple operating modes can be provided, and more hot air is directed to the foot space.

[0081] Figure 3An intake housing is shown. The device includes an intake housing and a blower (or electric fan unit) specifically having a single impeller, in other words, an impeller 54 equipped with blades, capable of rotating about axis A. The device 2 includes a tubular member 56 that defines a first airflow passage 58 and a second airflow passage 60. The first airflow passage 58 allows the flow of a first airflow intended to pass through a first axial portion of the impeller 54b, and the second airflow passage 60 allows the flow of a second airflow intended to pass through a second axial portion of the impeller 54a. The tubular member 56 is mounted at a position at a first end of the impeller 54 and defines an internal space or volume forming at least a portion of the first airflow passage 58, and the second airflow passage 60 extends to the outside of the tubular member 56. The device 2 also includes an intake housing that covers the first end of the impeller 54 and the tubular member 56. The intake housing includes guides capable of directing the first airflow into the first airflow passage 58 and the second airflow into the second airflow passage 60. When the device 2 is installed in a vehicle, the axial portions of the impellers 54a and 54b can be made, for example, with reference to the vertical axis of the vehicle.

[0082] For this purpose, the intake housing may include, for example, a first air inlet and a second air inlet, one for recirculated air and one for fresh air, and also includes three vents having a coaxial rotating shaft. The central vent is arranged to allow air communication between the air inlet and the first airflow passage 58. The two lateral vents are arranged to allow air communication between the air inlet and the second airflow passage 60. The intake housing 14 may also include an air filter through which the first and second airflows will pass.

[0083] Impeller 54 is arranged in blower housing 62, the outlet of which includes two flow channels 4a, 4b separated by a partition wall 13 corresponding to a portion of separation baffle 5. In other words, a first airflow channel 58 directs airflow to a first axial portion of impeller 54b, thereby leading to the second flow channel 4b, while a second airflow channel 60 directs airflow to a second axial portion 54a of impeller 54, thereby leading to the first flow channel 4a.

[0084] A blower, namely one or more bladed impellers 54, is contained within a helical portion of a housing, commonly referred to as a blower housing 62. Airflow drawn in by the one or more bladed impellers 54 is directed toward the walls of the blower housing 62 and thus closely follows a circular trajectory defined by these walls. The blower housing 62 then has a blower housing outlet in the form of a straight duct, such that airflow exiting the blower housing 62 follows the same direction.

[0085] The portion of the housing 4 located between the outlet of the blower housing 62 and the distribution arrangement is generally referred to as the diffuser. The diffuser corresponds to a channel in which the airflow leaving the blower housing 62 is guided all the way to the third heat exchanger 10, in this case, the evaporator 10.

[0086] The device 2 includes a separation baffle 5 that separates or defines two flow pipes 4a, 4b relative to each other. The separation baffle can be made as a single piece and extends within the heating, ventilation, and / or air conditioning unit 2, having orifices to allow the introduction of various heat exchangers 6, 8, 10; alternatively, the separation baffle can be several sections or modules. It may have a first section 13 extending between the blower and the evaporator 10, a second section 5 extending between the third heat exchanger 10 and the first heat exchanger 6, and a third section extending above the second heat exchanger 8.

[0087] The separation baffle 5 according to the invention is not limited to any particular shape. The separation baffle corresponds to an element capable of separating or defining two flow channels 4a, 4b. For example... Figure 1 and 3 As shown, the first part corresponds to a planar wall. Here, the second part corresponds to a unit, that is, a collection of walls defining an uneven or non-planar shape, having an adjacent element that the second hybrid door 30 can support against, or located between spaces designed to at least partially accommodate the third hybrid door 32. The third part corresponds to an omega-shaped wall, which has a space for accommodating the second heat exchanger 8 and the adjacent element, against which the first door 20, in particular the second blade 20b, is supported.

[0088] Device 2 may include, for example Figure 4 The intake housing 19 is shown. In this case, the intake housing 19 includes at least two different air inlets 15, 17 extending across the width (d2) of the intake housing, and includes air guide members 77, 78, 79, which are configured to at least guide the airflow allowed to enter the intake housing 19.

[0089] The air guiding member includes at least three coaxial doors 77, 78, and 79: a central door 77 and two side doors 78 and 79 arranged on each side of the central door 77. The coaxial doors 77, 78, and 79 are arranged between the two distinct air inlets 15 and 17 of the intake housing 19 to allow movement about a single pivot 80. The central door 77 extends over a portion of the width of the intake housing 19 that is greater than or equal to the width of the two side doors 78 and 79.

[0090] The coaxial doors 77, 78, and 79 are drum-shaped doors, and each is arranged to be able to move between a first extreme position and a second extreme position. In the first extreme position, the doors 77, 78, and 79 close the first air inlet 15, and in the second extreme position, the doors 77, 78, and 79 close the second air inlet 17.

[0091] In defog mode, the central door 77 needs to be in the first extreme position of closing the second air inlet 17. The side doors 78 and 79 need to be in the second extreme position of closing the first air inlet 15.

[0092] In this way, the fresh air flow FE can flow through the blower through the first air inlet 15, be guided into the interior of the tubular member 56, and reach the first axial portion of the impeller 54b, thus appearing in the second flow duct 4b; and the recirculation air flow FR can also flow through the blower through the side doors 78, 79, which guide the recirculation air flow FR to the exterior of the tubular member 56, so as to reach the second axial portion of the impeller 54a, and thus appear in the first flow duct 4a.

[0093] Furthermore, the housing 4 includes a shielding element 42 disposed at one end of the fourth door 34. The shielding element 42, commonly referred to as a progressive tip, has a shape complementary to the travel of the fourth door 34 and extends at least partially over a portion of the door's travel. In other words, the housing 4 includes a shielding element 42 or shield that closely follows the curved trajectory of the fourth door 34. Alternatively, the shielding element 42 may be at least partially recessed, within which the fourth door moves. Specifically, the fourth door 34 corresponds to a butterfly door that pivots about an axis of rotation disposed between two blades or at the center of a single blade, such that one or more blades follow a circular trajectory and pivot from one extreme position (where they abut against the housing 4 to prevent airflow along the bypass path 26) to another extreme position (where their obstruction to airflow is minimal).

[0094] By opening the fourth door 34 or pivoting it at a certain angle, an influx of air is created, drawing cold air towards the distribution arrangement. This is not conducive to good mixing with the hot air, and as a result, the defrost vents or ventilation vents are colder than the set point temperature given by the vehicle passengers.

[0095] Therefore, the shielding element 42 allows for the creation of a dead zone, thereby enabling better calibration of the amount of cold air for temperature progression.

[0096] The fourth door 34 is butterfly-shaped, and the shielding element 42 is arranged in the upstream portion of the housing 4 relative to the airflow and relative to the fourth door 34. In other words, the shielding element 42 is arranged between the fourth door 34 and the third heat exchanger 10 relative to the airflow.

[0097] The housing 4 includes a second shielding element 45 disposed at the other end of the door 34. In the same manner, the second shielding element has a shape complementary to the travel of the door leaf, or in other words, the second shielding element is at least partially recessed, so that it also creates a dead zone.

[0098] like Figure 1 As shown, the second shielding element 45 is formed by a set of walls that are combined together or formed as a single piece, and also forms a guide wall 22.

[0099] The first shielding element 42 extends over at least 10% of the door's travel, preferably over 20% to 50% of the door's travel. In other words, if the fourth door 34 pivots within an angle range of [0°, 100°], then in this case, the recessed portion of the shielding element 42 extends at least within an angle range of [0°, 10°], preferably between [0°, 20°], or even between [0°, 50°] and all intermediate values.

[0100] The second shielding element 45 extends over at least 5% of the door's travel, preferably over 10% to 30% of the door's travel. In other words, the recessed portion of the second shielding element 45 extends at least within an angle range encompassing [0°, 10°], preferably between [0°, 10°], or even between [0°, 30°] and all intermediate values.

Claims

1. A heating, ventilation and / or air conditioning device (2) for a motor vehicle, comprising a housing (4), said housing (4) comprising: The first flow channel (4a) is used for the first gas flow (Fa); The second flow channel (4b) is used for the second airflow (Fb); Separating partitions (5, 13) are arranged inside the housing (4) to separate the first flow channel (4a) from the second flow channel (4b); A first heat exchanger (6) is arranged in the first flow pipe (4a) and the second flow pipe (4b), and the first heat exchanger (6) is shared by the two flow pipes (4a, 4b); The second heat exchanger (8) is arranged downstream of the first heat exchanger (6) relative to the flow of the airflow and is arranged in a separate flow duct (4a, 4b); The first door (20) is located downstream of the second heat exchanger (8); as well as An airflow guide wall (22) is arranged in the first flow pipe (4a) downstream of the first heat exchanger (6) and directs the first airflow (Fa) toward the first door (20). The characteristic feature is that the housing (4) has a space (24) between the airflow guide wall (22) and the first door (20), such that the first door (20) cannot abut against the airflow guide wall (22). The first door (20) pivots between two extreme positions, namely a first extreme position and a second extreme position. In the first extreme position, the first door (20) abuts against the separation partition (5) and / or the second heat exchanger (8), and in the second extreme position, the first door (20) abuts against the wall of the housing (4). Furthermore, the first door (20) pivots to an intermediate position (I) between two extreme positions, the airflow guide wall (22) for guiding airflow extends substantially along direction P, and the first door (20) includes blades (20b) extending along direction V; in the intermediate position (I), the blades (20b) are located in the continuation of the airflow guide wall (22) and the direction P and the direction V are aligned in the intermediate position. The first flow duct (4a) and the second flow duct (4b) of the airflow each include bypass paths (26, 28) that bypass the first heat exchanger (6), and the bypass paths (26, 28) are arranged on each side of the first heat exchanger (6). The second door (30) is arranged in the first flow duct (4a) for airflow, and the third door (32) is arranged in the second flow duct (4b) for airflow. The second door (30) and the third door (32) are arranged between the first heat exchanger (6) and the third heat exchanger (10) to guide each corresponding airflow (Fa, Fb) through the corresponding bypass path (26, 28) and / or through the first heat exchanger (6). The first flow duct (4a) for airflow also includes a fourth door (34) arranged in the corresponding bypass path (26). The housing (4) includes a shielding element (42) disposed at one end of the fourth door (34), the shielding element having a shape complementary to the travel of the fourth door (34), the shielding element (42) being disposed between the fourth door (34) and the third heat exchanger (10) relative to the flow of air. The housing (4) includes a second shielding element (45) disposed at the other end of the fourth door (34), the second shielding element (45) being formed by a set of walls that are joined together or formed as a single piece and also forming the airflow guide wall (22).

2. The apparatus (2) according to claim 1, wherein, The device (2) includes a third heat exchanger (10) which is arranged upstream of the first heat exchanger (6) relative to the flow of the airflow. The third heat exchanger (10) is arranged in the first flow pipe (4a) and the second flow pipe (4b) and is shared by the two flow pipes (4a, 4b).

3. The apparatus (2) according to claim 1 or 2, wherein, In the intermediate position (I), the space (24) between the end of the airflow guide wall (22) and the end of the first door (20) is 5 mm to 25 mm.

4. The apparatus (2) according to claim 1 or 2, wherein, When the first door (20) is positioned at the second extreme position, the first door (20) can close the inlet of the outlet pipe (12).

5. A motor vehicle, characterized in that, It includes a heating, ventilation and / or air conditioning device (2) according to claim 4, wherein the outlet duct (12) corresponds to a foot space outlet and is configured to supply air to the foot space area inside the vehicle.

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