Heater, ventilator, and / or air conditioner for motor vehicle

Abstract

To provide an air conditioner which can inhibit thermal comfort from being affected by a temperature around feet being higher than ventilating air.SOLUTION: In a heater, ventilator, and / or air conditioner (2) for a motor vehicle, a housing (4) includes: a first duct (4a); a second duct (4b); partitions (5, 13); a first heat exchanger (6) shared by the two flow ducts (4a, 4b); a first flap (20) disposed at the downstream of a second heat exchanger (8) disposed in the single duct (4a or 4b) at the downstream of the first heat exchanger (6); an air flow guide wall (22) disposed at the downstream of the first heat exchanger (6); and an airflow guide wall (22) which directs first air flow (Fa) in a direction of the first flap (20). The housing (4) has a space (24) between the air flow guide wall (22) and the first flap (20) to prevent the first flap (20) from contacting with the airflow guide wall (22).SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a heating, ventilation and / or air conditioning system for a motor vehicle, and to a motor vehicle equipped with such a heating, ventilation and / or air conditioning system. [Background technology]

[0002] Motor vehicles are generally equipped with a heating, ventilation and / or air conditioning system for adjusting aerothermal parameters of an air flow distributed towards the interior of the vehicle compartment. The system usually comprises a housing defined by a partition. The housing is provided with an opening including at least one air inlet and at least one air outlet.

[0003] In a known manner, the housing contains a blower for directing the flow of air from the air inlet to the air outlet, and also contains heat treatment means for heating and / or cooling the flow of air before it is distributed inside the passenger compartment. By way of example, the heat treatment means may comprise an evaporator intended to cool and dehumidify the flow of air passing through it, and a radiator intended to heat the flow of air passing through it, possibly associated with an additional radiator.

[0004] Heating, ventilation and / or air conditioning systems, also known by the abbreviation HVAC, can be supplied either with air from outside the vehicle (also called fresh air) or with recirculated air, i.e. air taken from the passenger compartment. In known embodiments, a blower is used to blow an airflow, which can be a flow of fresh or new air coming from outside the vehicle, or a flow of recirculated air coming from the passenger compartment, or even a mixture of an airflow of fresh air and an airflow of recirculated air.

[0005] It is necessary to be able to separate the air flows (fresh air - recirculated air) depending on the needs of the vehicle occupants, in particular when the air flow passes through a heating, ventilation and / or air conditioning device, i.e. in other words when the air flow is thermally conditioned.

[0006] Specifically, the recirculated air can quickly reach the temperature desired by the user because it is already close to the set temperature to be reached. However, the recirculated air contains more moisture than air coming from outside the vehicle. This means that if the recirculated air is directed near the windshield, for example through a vent located in front of the driver or in front of the passenger in the passenger seat, or if it is directed directly at the windshield, the moisture contained in the recirculated air will condense on the windshield, causing fogging.

[0007] The outlet comprises a number of ducts that distribute the airflow to nozzles that open into different zones of the vehicle cabin, in particular a defrost outlet that directs the airflow towards a defrost nozzle for defrosting the windshield, a ventilation duct that directs the airflow towards side / center ventilation nozzles to cool / warm the vehicle occupants, a foot duct that directs the airflow towards foot nozzles to cool / warm the feet of occupants in the front / rear of the vehicle. There may also be ducts dedicated to occupants in the rear seats of the vehicle.

[0008] One known solution is to thermally condition an airflow of fresh air and direct it internally near or directly against the windshield, and thermally condition an airflow of recirculated air and direct it internally away from the windshield through other ventilation openings, such as ventilation opening outlets located at the feet of the driver or passenger seat occupant, this is an operating mode referred to as "dual layer".

[0009] However, it has been found that in these known devices, an excessive amount of hot air passing through the radiator is directed towards the ventilation outlet, resulting in the temperature of the footwell outlet airflow being equal to the temperature of the ventilation outlet airflow, thus compromising thermal comfort where a higher temperature at the feet than at the ventilation is generally desirable. Summary of the Invention

[0010] The aim of the present invention is to overcome this drawback.

[0011] To this end, the invention relates to a heating, ventilation and / or air conditioning device for a motor vehicle, comprising a housing, said housing comprising: - a first flow duct for a first air flow; - a second flow duct for a second air flow; a separator partition disposed inside the housing and separating the first flow duct from the second flow duct; a first heat exchanger arranged in the first flow duct and in the second flow duct, the first heat exchanger being common to both of the flow ducts; a second heat exchanger arranged downstream of the first heat exchanger with respect to the flow of air, the second heat exchanger being arranged in a single flow duct; a first door arranged downstream of the second heat exchanger; an air flow guide wall disposed in the first flow duct downstream of the first heat exchanger, the air flow guide wall directing the first air flow towards the first door; Equipped with The housing has a space between the air flow guide wall and the first door, so that the first door cannot abut against the air flow guide wall. The present invention proposes an apparatus characterized by:

[0012] Thus, the invention ensures that the airflow is guided towards the door which can direct the airflow towards the footwell outlet, however, due to the space created between the airflow guiding wall and the door, the normal operating mode can be maintained and hot air can be supplied to the ventilation and / or defrost outlets at the same time as it is supplied to the footwell outlet.

[0013] According to one aspect of the invention, the device comprises a third heat exchanger arranged upstream of the first heat exchanger with respect to the flow of air flow, the third heat exchanger being arranged in the first flow duct and in the second flow duct and being common to the two flow ducts.

[0014] According to one aspect of the invention, the first door pivots between two extreme positions, in the first extreme position the door abuts against the separating partition and / or the second heat exchanger, and in the second extreme position the door abuts against a wall of the housing.

[0015] According to one aspect of the invention, the first door pivots to an intermediate position between the two extreme positions, the wall for guiding the air flow extends substantially in one direction, and the first door is provided with a vane extending in one direction, and in the intermediate position, the vane is continuous with the air flow guiding wall.

[0016] According to one aspect of the invention, the first door pivots to an intermediate position between the two extreme positions, the wall for guiding air flow extends in a direction D and the first door is provided with a vane extending in a direction V, and in the intermediate position, the direction D and the direction V are substantially aligned.

[0017] According to one aspect of the present invention, in the intermediate position, the space between the end of the air flow guide wall and the end of the first door is 5-25 mm, preferably 10-15 mm.

[0018] According to one aspect of the invention, the first door is capable of closing the inlet opening of the outlet duct when the first door is in the second extreme position.

[0019] According to one aspect of the invention, each of the first flow duct for air flow and the second flow duct for air flow includes a bypass path that bypasses the first heat exchanger, the bypass path being disposed on either side of the first heat exchanger.

[0020] According to one aspect of the invention, a second door, in particular a butterfly type door, is arranged in the first flow duct for air flow and a third door, in particular a sliding vane type door, is arranged in the second flow duct for air flow, said doors being arranged between the first and third heat exchangers to direct each respective air flow through the corresponding bypass path and / or through the first heat exchanger.

[0021] According to one aspect of the invention, the first air flow duct further comprises a fourth door, in particular of butterfly type, arranged in the corresponding bypass path.

[0022] According to one aspect of the invention, the housing includes a screening element disposed at one end of the door, the screening element having a shape that complements the door travel and extends at least partially across a portion of the door travel.

[0023] According to one aspect of the invention, the door is of a butterfly type and the screening element is located at an upstream part of the housing with respect to the door with respect to the air flow stream.

[0024] According to one aspect of the invention, the housing includes a second screening element disposed at the other end of the door.

[0025] According to one aspect of the invention, the first screening element extends over at least 10% of the door travel, preferably between 20% and 50% of the door travel.

[0026] According to one aspect of the invention, the second screening element extends over at least 5% of the door travel, preferably over 10%-30% of the door travel.

[0027] The invention also relates to a motor vehicle equipped with a heating, ventilation and / or air conditioning system as described above.

[0028] According to one aspect of the invention, the duct corresponds to a footwell outlet and is configured to supply air to the footwell zone of the vehicle compartment.

[0029] It should be understood that the totality of the above-mentioned features and configurations is in no way limiting. Further features, details and advantages of the invention will become more apparent on reading the detailed description given below with reference to the attached schematic drawings, and a number of exemplary embodiments shown in a non-limiting manner. [Brief description of the drawings]

[0030] [Figure 1] FIG. 1 is a cross-section in a contour view showing a heating, ventilation and / or air conditioning device according to the invention in one mode of operation. [Diagram 2] FIG. 2 is a detailed view of FIG. 1 showing the apparatus in another mode of operation. [Diagram 3] FIG. 3 is a schematic outline view showing another part of a heating, ventilation and / or air conditioning system. [Figure 4] FIG. 4 is a perspective view showing another part of a heating, ventilation and / or air conditioning apparatus. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] 1 shows a heating, ventilation and / or air conditioning device 2 according to the invention, comprising a housing 4 containing means for thermally treating an air flow intended to be distributed in a vehicle compartment. The housing 4 comprises a first flow duct 4a for a first air flow Fa and a second flow duct 4b for a second air flow Fb.

[0032] According to the invention, the housing 4 comprises a separating partition 5 arranged inside the housing 4 and separating the first flow duct 4a from the second flow duct 4b.

[0033] The heat treatment means comprise a first heat exchanger 6, for example a radiator, intended to heat a part of the air flow passing through the heating, ventilation and / or air conditioning device 2. The first heat exchanger 6 is arranged in the first flow duct 4a and in the second flow duct 4b. Said heat exchanger 6 is common to the two flow ducts 4a and 4b.

[0034] The heat treatment means may further comprise a second exchanger 8 corresponding to an electric radiator intended to warm up the airflow more quickly, in particular when starting the vehicle. The second heat exchanger 8 is arranged downstream of the first heat exchanger 6 with respect to the airflow. The second heat exchanger is arranged in a single flow duct. In this example, the second exchanger 8 is arranged only in the second flow duct 4b.

[0035] The heat treatment means also comprise a third heat exchanger 10, for example an evaporator, arranged upstream of the first heat exchanger 6 in the flow direction of the air flow. The third heat exchanger 10 is intended to cool and dehumidify all the air flows passing through the heating device. The third heat exchanger 10 is arranged in the first flow duct 4a and in the second flow duct 4b. Said heat exchanger 10 is common to the two flow ducts 4a and 4b.

[0036] Airflow is introduced into the housing 4 through an inlet (not shown), is heat treated by heat exchangers 6, 8, 10 and then directed towards an outlet by a blower (not shown).

[0037] The outlet comprises a number of ducts that distribute the airflow to nozzles that open into different zones of the vehicle compartment. In particular, the outlet comprises a first outlet duct 12 that can direct the airflow towards a footwell nozzle to warm the feet of passengers in the front and possibly the rear of the vehicle. The outlet also comprises a second outlet duct 14 that can direct the airflow towards a defrost nozzle to defog the windscreen. The outlet comprises a third outlet duct 16 that can direct the airflow towards a side / center ventilation nozzle to cool / warm passengers in the front of the vehicle. The outlet may also comprise a fourth outlet duct 18 that can guide the airflow towards the rear zone of the vehicle to cool / warm passengers in the rear of the vehicle. Each outlet duct comprises an access opening that can be at least partially closed by a blocking door.

[0038] According to the invention, the device comprises a first door 20 arranged downstream of the second heat exchanger 8 and which in one extreme position abuts against the separating partition 5 or against the second heat exchanger 8. As shown in FIG. 1, the first door 20 is of butterfly type. That is to say, it has a rotation axis arranged in the center of the vane P or between the two vanes. The first door 20 is arranged in the first outlet duct 12. In other words, the first door 20 is arranged in such a way that it can at least partially close the inlet opening of the first outlet duct 12. As shown in FIG. 1, the first door 20 is of butterfly type and has a rotation axis 20c arranged between the two vanes 20a, 20b. In this example, the two vanes 20a, 20b are located in two separate planes. Of course, the two vanes may also be located in the same plane. The first vane 20a can close or open the access to the first outlet duct 12. The second vane 20b can guide the airflow exiting the first heat exchanger 6 or the second heat exchanger 8.

[0039] The first door 20 pivots between two extreme positions. In the first extreme position, the first door 20, more particularly the second vane 20b, abuts against the separating partition 5 and / or the second heat exchanger 8. In the second extreme position, the first door 20, more particularly the second vane 20b, abuts against the wall of the housing 4. The first door 20 can naturally take any intermediate position between these two extreme positions.

[0040] In the first extreme position as shown in FIG. 2, the first door 20, and in particular the second vane 20b, abuts against the separating partition 5, while the first vane 20a abuts against the wall of the housing 4, and in particular the wall of the first outlet duct 12, thereby maximizing the flow rate of air through the first outlet duct 12.

[0041] In the second extreme position shown in FIG. 3, the first door 20, and in particular the second vane 20b, abuts against the wall of the housing 4, while the first vane 20a completely closes the first outlet duct 12, so that no airflow can pass through the first outlet duct 12.

[0042] According to the invention, the heating, ventilation and / or air conditioning device further comprises an air flow guide wall 22 arranged in the first flow duct 4a for the air flow Fa and downstream of the first heat exchanger 6 with respect to the flow of the air flow. The air flow guide wall 22 directs the first air flow Fa towards the first door 20.

[0043] Thus, according to the invention, the first hot air flow F1 having passed through the first heat exchanger 6 is directed towards the first door 20, thereby towards a first outlet duct intended for the footwell zone of the passenger compartment.

[0044] As a result of being oriented in this way, the majority of the flow rate of the heated first air flow Fa is directed towards the footwell exit duct 12.

[0045] However, according to the invention, it is most but not all of the flow rate of the first heated airflow Fa that is directed towards the footwell outlet duct 12. In particular, there is always a portion that can flow towards the second outlet duct 14 and / or the third outlet duct 16.

[0046] For this purpose, the device 2 according to the invention, in particular the housing 4, has a space 24, i.e. a gap, between the air flow guide wall 22 and the first door 20, so that the first door 20 cannot abut against the air flow guide wall 22. In other words, according to the invention, the first door 20 is configured in such a way that it cannot come into contact with the air flow guide wall 22.

[0047] As mentioned before, the first door 20 pivots to an intermediate position I as shown in Figure 1, located between the two extreme positions. The airflow guide wall 22 extends substantially in a direction P, and the first door, and in particular the second vane 20b, extends substantially in a direction V. As shown in Figure 1, the directions P and V are substantially aligned in this intermediate position. In other words, the second vane 20b is contiguous with the airflow guide wall 22 leaving a space 24 between these two elements.

[0048] At the intermediate position, the space 24 between the end of the air flow guide wall 22 and the end of the first door 20, particularly the end of the second vane 20b, is 5 to 25 mm, preferably 10 to 15 mm.

[0049] The presence of this gap 24 therefore ensures that a portion of the first air flow Fa that has passed through the first heat exchanger 6 can always be conveyed towards the second outlet duct 14 and / or the third outlet duct 16.

[0050] The first flow duct 4a for the first air flow Fa and the second flow duct 4b for the second air flow Fb each include a bypass path 26, 28 that bypasses the first heat exchanger 6. The bypass paths 26, 28 are disposed on both sides of the first heat exchanger 6.

[0051] According to the invention, a second door 30 of the butterfly type is arranged in the first flow duct 4a for the first air flow Fa, and a third door 32 of the sliding vane type is arranged in the second flow duct 4b for the second air flow Fb. These said doors are arranged between the first heat exchanger 6 and the third heat exchanger 10 to direct each respective air flow Fa, Fb through the corresponding bypass path 26, 28 and / or through the first heat exchanger 6.

[0052] In other words, the butterfly-type second door 30 can pivot between two extreme positions and can take any intermediate position. In a first extreme position, the second door 30 completely blocks the passage for the air flow Fa to access the first heat exchanger 6. In a second extreme position, the second door 30 opens the passage for the air flow Fa to access the first heat exchanger 6 to the maximum extent. The first flow duct 4a for the first air flow Fa further comprises another door, thus a fourth door 34. The fourth door 34 is also of butterfly type and is arranged in a corresponding bypass path 26 bypassing the first heat exchanger 6. The fourth door 34 can pivot between two extreme positions and can take any intermediate position. In a first extreme position, the fourth door 34 completely blocks the bypass path 26 bypassing the first heat exchanger 6. In the second extreme position, the fourth door 34 least obstructs the flow of the first air flow Fa through the bypass path 26.

[0053] The third door 32 of the sliding vane type can slide between two extreme positions and can assume any intermediate position. In a first extreme position, the third door 32 completely blocks the passage for the air flow Fa to access the first heat exchanger 6. In a second extreme position, the third door 32 completely blocks the corresponding bypass path 28.

[0054] Of course, the present invention is not limited to the type of first door 20, second door 30, third door 32, or fourth door 34. Each door may correspond to a butterfly door, a drum door, an end hinge flag door (where the pivot point is located at one end of the vane), or a sliding vane door.

[0055] As mentioned above, each outlet duct 12, 14, 16, 18 has an associated blocking door that allows or prevents the respective airflow Fa, Fb from passing through the outlet duct.

[0056] The first door 20 is associated with the first outlet duct 12. The fifth door 36, in this example of the end-hinged flag type, is associated with the second outlet duct 14 directing air towards the defrosting nozzles near the windshield of the vehicle. The fifth door 36 is able to fully close the second outlet duct 14. The sixth door 38, in this example of the drum door type, is associated with the third outlet duct 16 directing air towards the central / side ventilation nozzles. The sixth door 38 is such that it is unable to fully close the third outlet duct 16. In particular, the sixth door 38 has a notch (not shown) on its side. The purpose of this is to always ensure an air leakage representing approximately 10% of the maximum flow rate, even when the sixth door 38 is in the extreme position where it closes the third outlet duct 16. Furthermore, the seventh door 40, in this example of the butterfly type, is associated with the fourth outlet duct 18 directing air towards the ventilation nozzles for the passengers in the rear of the vehicle. The seventh door 40 is able to fully close the fourth outlet duct 18 .

[0057] The structure of the sixth door 38 can ensure that the airflow is always directed towards the vehicle's side window, and can defog the side window. This is particularly advantageous in the defrost mode (see

[0059] ) where the sixth ventilation door 38 is in the extreme blocking position, but the vehicle's window can still be defogged.

[0058] The first, fifth, sixth and seventh doors are referred to as distribution doors or flaps, and the second, third and fourth doors are referred to as mixing doors or flaps.

[0059] The device 2 according to the invention may comprise a mechanism for synchronising the doors, in which a flap of the seventh door 40 may be rotationally connected to a flap of the sixth door 38, for example by means of a connecting rod.

[0060] Such a configuration of the heating, ventilation and / or air conditioning device 2 according to the invention means that several operating modes are available, which are described below: Only the distributing doors or flaps and the mixing doors or flaps are described, which depend on the temperature setpoint indicated by the front and / or rear occupants.

[0061] Foot-under mode: In foot-under mode, as shown in Fig. 2, the first door is in a position opening the first outlet duct 12, i.e. in other words the first door 20 abuts against the separating wall 5 and / or against the second heat exchanger 8. The fifth door 36 is in a partially blocking position (80% closed), the sixth door 38 is in a position blocking the third outlet duct 16 with an air leakage showing up to 10% of the maximum flow rate and the seventh door is in a position completely blocking the fourth outlet duct 18.

[0062] Double layer mode: in this mode, as shown in Fig. 1, the first door 20 is in an intermediate position I and the second vane 20b is continuous with the guide wall 22 which guides the heated first air flow Fa. The fifth door 36 is in a position blocking the second outlet duct 14, and the sixth door 38 and the seventh door 40 are in an intermediate open position, i.e. between the position blocking and the position opening each corresponding outlet duct 16, 18. However, the sixth door 38 may also be in a wide open position.

[0063] Foot / Defrost Mode: In this mode, the first door 20 and the fifth door 36 are in an intermediate position, and the sixth door 38 and the seventh door 40 are in a position blocking each corresponding outlet duct 16, 18. For the sixth door 38, air is leaking.

[0064] Ventilation mode: the sixth door 38 and the seventh door 40 are in a position to open their respective outlet ducts 16,18, and the first door 20 and the fifth door 36 are in a position to block their respective outlet ducts 12,14.

[0065] Defrost mode: only the fifth door 36 is in a position to open the outlet duct 14, the other distribution doors are in a position to block each corresponding duct.

[0066] The table below summarizes the different modes. For each mode, footwell, defrost, etc., there are two rows. In the first row, the degree of opening (percentage) of a given door is recorded on the left (100 corresponds to the maximum opening, in other words the extreme position where the door least obstructs the airflow, and 0 corresponds to the degree to which the corresponding duct is blocked). The doors are also recorded according to their opening and the flow rate passing through these doors. The second row corresponds to the air flow rate (percentage of the total air flow) that flows through the corresponding air duct. [Table 1]

[0067] The present invention has multiple operating modes and is able to direct more hot air towards the feet.

[0068] FIG. 3 shows an air inlet housing. The device 2 comprises an air inlet housing and a blower (or motor-fan unit), i.e. a single impeller, in other words an impeller wheel 54, rotatable about a rotation axis A. The device 2 comprises a tubular member 56 capable of defining a first air flow channel 58 and a second air flow channel 60. The first air flow channel 58 allows the flow of a first air flow intended to pass through a first axial portion of the impeller 54b. The second air flow channel 60 allows the flow of a second air flow intended to pass through a second axial portion of the impeller 54a. The tubular member 56 is attached at the location of the first end of the impeller 54 and defines an interior space or volume, forming at least a part of the first air flow channel 58. The second air flow channel 60 extends outside the tubular member 56. The device 2 further comprises an air inlet housing covering the first end of the impeller 54 and the tubular member 56. The air inlet housing comprises guiding means capable of directing the first air flow into the first air flow channel 58 and the second air flow into the second air flow channel 60. The axial portion of the impellers 54a, 54b may for example be configured with reference to the vertical axis of the vehicle when the device is installed in the vehicle.

[0069] For this purpose, the air inlet housing may, for example, comprise a first and a second air inlet opening, one for recirculated air and one for fresh air, and three drum doors with coaxial rotation axes. The central drum door is arranged to allow air communication between the air inlet and the first air flow channel 58. The two lateral drums are arranged to allow air communication between the air inlet opening and the second air flow channel 60. The air inlet housing 14 may further comprise an air filter through which the first and second air flows are intended to pass.

[0070] The impeller 54 is arranged in a blower housing 62. Its outlet comprises two flow ducts 4a, 4b separated by a separation wall 13 corresponding to a part of the separating partition 5. In other words, the first air flow channel 58 opens into the second flow duct 4b to direct the air flow towards a first axial part of the impeller 54b, while the second air flow channel 60 opens into the first flow duct 4a to direct the air flow towards a second axial part of the impeller 54.

[0071] The air blower, i.e. the impeller or impellers 54, are housed in a helical section of a housing commonly referred to as a blower housing 62. The airflow drawn in by the impeller or impellers 54 is directed towards the walls of the blower housing 62 so as to closely follow a circular trajectory defined by these walls. The blower housing 62 has a blower housing outlet in the form of a straight duct, and the airflow leaving the blower housing 62 follows this same direction.

[0072] The portion of the housing 4 located between the outlet of the blower housing 62 and the distribution is generally referred to as the branch. The branch corresponds to the flow path that the airflow leaving the blower housing 62 takes to the third heat exchanger 10, in this example the evaporator 10.

[0073] The device 2 comprises a separation partition 5 which separates or defines the two flow ducts 4a, 4b from each other. This separation partition can be constructed as one piece and can extend inside the heating, ventilation and / or air conditioning device 2 with orifices allowing the introduction of the various heat exchangers 6, 8, 10. Or the separation partition can consist of several pieces or modules. There can be a first part 13 extending between the blower and the evaporator 10, a second part 5 extending between the third heat exchanger 10 and the first heat exchanger 6, a third extending above the second heat exchanger 8.

[0074] The separating partition 5 according to the invention is not limited to a particular shape. It corresponds to an element capable of separating or defining the two flow ducts 4a, 4b. As shown in figures 1 and 3, the first part corresponds to a planar wall. Here, the second part corresponds to an assembly of walls defining an undulating, i.e. non-planar, shape between the spaces designed to accommodate the units, i.e. the abutment elements with which the second mixing door 30 can come into contact, or at least partially the third mixing door 32. The third part corresponds to an omega-shaped wall that accommodates the second heat exchanger 8 and has a space to accommodate the abutment elements with which the first door 20, in particular the second vane 20b, comes into contact.

[0075] 4, the device 2 may comprise an air inlet housing 19. In this example, the air inlet housing 19 comprises at least two separate air inlets 15, 17 extending across a width (d2) of the air inlet housing, and air guide members 77, 78, 79 configured to direct at least the air flow intended to enter the air inlet housing 19.

[0076] The air guide means comprises at least three coaxial doors 77, 78, 79: a central door 77 and two lateral doors 78, 79 arranged on either side of the central door 77. Said coaxial doors 77, 78, 79 are arranged between said two separate air inlet openings 15, 17 of the air inlet housing 19 so as to be movable about a single pivot axis 80. The central door 77 extends over a portion of said width of the air inlet housing 19, said portion being greater than or equal to the portion of width extended by the two lateral doors 78, 79.

[0077] The coaxial doors 77, 78, 79 are of the drum door type and are each arranged to be movable between a first extreme position in which the door 77, 78, 79 closes the first air inlet 15 and a second extreme position in which the door 77, 78, 79 closes the second air inlet 17.

[0078] In the defogging mode, the central door 77 must be in a first extreme position blocking the secondary air inlet 17. The side doors 78, 29 must be in a second extreme position blocking the primary air inlet 15.

[0079] In this manner, the fresh air flow FE can pass through the blower via the first air inlet 15, be guided towards the inside of the tubular member 56, reach the first axial portion of the impeller 54b and emerge into the second flow duct 4b. Similarly, the recirculated air FR can pass through the blower, be guided through the side doors 78, 79 which guide the recirculated air FR towards the outside of the tubular member 56, reach the second axial portion of the impeller 54a and emerge into the first flow duct 4a.

[0080] Furthermore, the housing 4 includes a screening element 42 located at one end of the fourth door 34. Said screening element 42, commonly known as a progressive tip, has a shape that complements the travel of the fourth door 34 and extends at least partially over a portion of the travel of the door. In other words, the housing 4 includes a screening element 42, i.e. a mask, that closely follows the curved trajectory of the fourth door 34. The screening element 42 is at least partially concave, and the fourth door may be said to move within the recess. In particular, the fourth door 34 corresponds to a butterfly door that pivots about an axis of rotation located between two vanes or in the center of a single vane. The vane or vanes follow a circular trajectory and pivot from one extreme position, where they (they) abut against the housing 4 and prevent the airflow from flowing along the bypass path 26, to another extreme position where they (they) least impede the flow of the airflow.

[0081] Opening or pivoting the fourth door 34 by a few degrees will cause air intrusion and draw cool air towards the distribution, which does not promote good mixing with the hot air, with the result that the defrost or ventilation outlet will be colder than the set temperature applied by the vehicle occupant.

[0082] In this manner, screening element 42 may create dead zones so that the amount of cold air may be better calibrated to the temperature advance.

[0083] The fourth door 34 is of the butterfly type and the screening element 42 is arranged in the upstream part of the housing 4 with respect to the air flow stream with respect to the fourth door 34. In other words, the screening element 42 is arranged between the fourth door 34 and the third heat exchanger 10 with respect to the air flow stream.

[0084] The housing 4 includes a second screening element 45 disposed at the other end of the door 34. Similarly, the second screening element has a shape that complements the travel of the door vanes, or in other words is at least partially concave so as to also create a dead zone.

[0085] 1, the second screening element 45 is formed by a set of walls joined together or formed in one piece to also form the guide wall 22.

[0086] The first screening element 42 extends over at least 10% of the door travel, preferably over 20% to 50% of the door travel, in other words, if the fourth door 34 pivots within the angular range comprised between [0°, 100°], the recess of the screening element 42 then extends in the angular range comprised between [0°, 10°], preferably between [0°, 20°] and / or [0°, 50°], and all intermediate values.

[0087] The second screening element 45 extends over at least 5% of the door travel, preferably over 10% to 30% of the door travel, in other words the recess of the second screening element 45 extends in an angular range comprised between 0°, 10°, preferably 0°, 10°, and also or up to an angular range 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: a first flow duct (4a) for the first air flow (Fa), a second flow duct (4b) for the second air flow (Fb), a separating partition (5, 13) arranged inside said housing (4) and separating said first flow duct (4a) from said second flow duct (4b); a first heat exchanger (6) arranged in said first flow duct (4a) and in said second flow duct (4b), said first heat exchanger (6) being common to both said flow ducts (4a, 4b); a second heat exchanger (8) arranged downstream of said first heat exchanger (6) with respect to the flow of the air flow, in particular arranged in a single flow duct (4a, 4b); a first door (20) arranged downstream of said second heat exchanger (8); an air flow guide wall (22) arranged in said first flow duct (4a) downstream of said first heat exchanger (6), said air flow guide wall (22) directing said first air flow (Fa) towards said first door (20); Equipped with The housing (4) has a space (24) between the air flow guide wall (22) and the first door (20), so that the first door (20) cannot abut against the air flow guide wall (22). An apparatus (2).

2. The device (2) comprises a third heat exchanger (10) arranged upstream of the first heat exchanger (6) with respect to the flow of the air flow, The third heat exchanger (10) is disposed in the first flow duct (4a) and the second flow duct (4b) and is common to the two flow ducts (4a, 4b).

2. The device (2) according to claim 1.

3. The first door (20) pivots between two extreme positions; In a first extreme position, the door abuts against the separating partition (5) and / or against the second heat exchanger (8); In the second extreme position, the door abuts against a wall of the housing (4).

3. Apparatus (2) according to claim 1 or 2.

4. said first door (20) pivots to an intermediate position (I) between said two extreme positions; The wall (22) for guiding the air flow extends substantially in a direction (P), The first door (20) comprises a vane (20b) extending in a direction (V); In the intermediate position (I), the vane (20b) is continuous with the air flow guide wall (22).

4. Apparatus (2) according to claim 3.

5. In the intermediate position (I), the space (24) between the end of the air flow guide wall (22) and the end of the first door (20) is 5 to 25 mm, preferably 10 to 15 mm.

5. Apparatus (2) according to claim 4.

6. said first door (20) being capable of closing an inlet opening of an outlet duct (12) when said door is in said second extreme position; An apparatus (2) according to any one of claims 3 to 5.

7. each of the first flow duct (4a) for air flow and the second flow duct (4b) for air flow comprises a bypass path (26, 28) bypassing the first heat exchanger (6); The bypass paths (26, 28) are arranged on both sides of the first heat exchanger (6). An apparatus (2) according to any one of the preceding claims.

8. A second door (30) is arranged in the first flow duct (4a) for air flow, A third door (32) is arranged in the second flow duct (4b) for air flow, the doors are disposed between the first heat exchanger (6) and the third heat exchanger (10) for directing each respective air flow (Fa, Fb) through a corresponding one of the bypass paths (26, 28) and / or through the first heat exchanger (6); 8. Apparatus (2) according to claim 7.

9. The first flow duct (4a) for air flow further comprises a fourth door (34) arranged in the corresponding bypass path (26).

9. Apparatus (2) according to claim 8.

10. 7. A motor vehicle equipped with a heating, ventilation and / or air conditioning device (2) as claimed in claim 6, characterized in that the outlet duct (12) corresponds to the footwell outlet and is configured to supply air to the footwell zone of the passenger compartment.

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