CN115427239A - Heating, ventilation and/or air conditioning units for motor vehicles - Google Patents

Abstract

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

Description

Heating, ventilation and/or air conditioning units for motor vehicles

technical field

The invention relates to a heating, ventilation and/or air conditioning device for a motor vehicle and to a motor vehicle comprising such a heating, ventilation and/or air conditioning device.

Background technique

Motor vehicles are usually equipped with ventilation, heating and/or air conditioning devices to adjust the aerothermal parameters of the airflow distributed towards the interior of the passenger compartment of the vehicle. The device generally comprises a housing divided by a partition in which an opening is provided, the housing comprising at least one air inlet and at least one air outlet.

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 a heat treatment device for heating and/or cooling the airflow prior to distribution to the vehicle interior. By way of example, the thermal processing apparatus may comprise an evaporator for cooling and dehumidifying the air flow passing through it, and a radiator which may be associated with an additional heat sink for heating the air flow flowing through it .

The heating, ventilation and/or air conditioning unit, HVAC for short, can be supplied with air from outside the vehicle, also called fresh air, or with recirculation air, that is to say air from the interior of the vehicle. In a known manner, a blower is used to circulate the air flow. This may be a fresh or fresh air flow from outside the vehicle, or a recirculation air flow from inside the vehicle, or a mixture of outside air and recirculation air flow.

It is important to be able to separate the airflow (outside air - recirculation air) according to the needs of the vehicle occupants, especially when the airflow is passed through heating, ventilation and/or air conditioning units, or in other words when the airflow is thermally conditioned.

In particular, since the recirculation air is already at a temperature close to the set point temperature to be achieved, it is possible to quickly reach the temperature desired by the user. However, the recirculated air contains more moisture than the air coming from outside the vehicle, which means that if the recirculated air is directed near the windscreen, for example via the air vents in front of the driver or in front of the front passenger, or directly to the windshield, the moisture contained in the recirculated air can condense on the windshield and create fog.

The outlets include a plurality of ducts that distribute airflow to nozzles leading to various areas of the vehicle interior, and specifically include defroster outlets that route airflow toward defroster nozzles to defogg the windshield, airflow toward Ventilation ducts conveyed by side/central ventilation nozzles for cooling/heating of vehicle occupants and footwell ducts directing airflow to footwell nozzles for cooling/heating of vehicle front/rear occupants' feet . There may also be dedicated ducts for rear seat passengers of the vehicle.

A known solution is to thermally condition the flow of outside air and send it into the interior near the windshield or directly onto the windshield and thermally condition the flow of recirculation air to pass it through Other vents, such as vent outlets located at the driver's or front passenger's feet, feed inward, away from the windshield. This is a mode of operation known as "two-layer".

However, it has been found in these known devices that an excessively large amount of hot air which has passed the radiator is directed towards the ventilation outlet, with the result that the temperature of the airflow for the footwell outlet is equal to the temperature of the airflow for the ventilation outlet. This leads to a reduction in thermal comfort, usually the temperature in the footwell is higher than the ventilation temperature.

Contents of the invention

The purpose of the present invention is to overcome this drawback.

To this end, the invention proposes a heating, ventilation and/or air-conditioning device for a motor vehicle comprising a housing comprising:

a first heat exchanger;

a bypass path bypassing the first heat exchanger; and

a gate (34), positioned in the bypass path,

It is characterized in that the housing comprises a shielding element arranged 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 part of the travel of the door.

Thus, the invention makes it possible to ensure a better mixing of the air.

According to an aspect of the invention, the door is butterfly-shaped, and the shielding element is arranged in an upstream part of the housing with respect to the flow of the air flow, with respect to the door.

According to an aspect of the invention, the housing includes a second shielding element arranged at the other end of the door.

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

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

According to one aspect of the present invention, the housing includes:

a first flow conduit for the first gas flow;

a second flow conduit for the second gas flow;

a separation baffle disposed inside the housing to separate the first flow conduit from the second flow conduit;

The first heat exchanger is arranged in the first flow conduit and the second flow conduit, and said heat exchanger is common to both flow conduits;

The second heat exchanger is arranged downstream of the first heat exchanger with respect to the flow of the gas flow and is arranged in a single flow duct.

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 the gas flow, the third heat exchanger being arranged in the first flow duct and the second flow duct, so The third heat exchanger is shared by the two flow conduits.

According to an aspect of the invention, the first flow duct of the gas stream and the second flow duct of the gas stream each comprise a bypass path around the first heat exchanger, the bypass paths being arranged on each side of the first heat exchanger.

According to an aspect of the invention, a second door is arranged in the first flow duct for the air flow, a third door is arranged in the second flow duct for the air flow, said doors are arranged between the first heat exchanger and the third between the heat exchangers so as to direct each respective airflow through a respective bypass path and/or through the first heat exchanger.

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

According to an aspect of the present invention, the first door is pivoted to an intermediate position between two extreme positions, the wall for guiding the airflow extends substantially in one direction, and the first door includes blades extending in one direction; In the intermediate position, the vanes are in the continuation of the flow guide wall.

According to one aspect of the invention, the first door is pivoted to an intermediate position between two extreme positions, the air flow guide wall extends in direction D, and the first door comprises a vane extending in direction V; The above middle position is basically aligned.

According to an aspect of the invention, in said intermediate position, the distance between the end of the airflow guiding wall and the end of the first door is between 5mm and 25mm, preferably between 10mm and 15mm.

According to an aspect of the present invention, when the first door is at the second extreme position, the first door can close the inlet of the outlet duct.

According to an aspect of the invention, the first flow duct of the gas stream and the second flow duct of the gas stream each comprise a bypass path around the first heat exchanger, the bypass paths being arranged on each side of the first heat exchanger.

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

According to an aspect of the invention, the first flow duct further comprises a fourth gate, in particular a butterfly gate, arranged in the respective bypass path.

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

According to an aspect of the invention, the duct corresponds to a footwell outlet and is configured to supply air to a footwell area inside the vehicle.

Description of drawings

It should be understood that the collection of features and configurations described above is by no means limiting. Other characteristics, details and advantages of the invention will become more apparent by reading the detailed description given below and a few exemplary embodiments given by way of non-limiting indications, with reference to the accompanying drawings, in which:

Figure 1 is a side sectional view showing a heating, ventilation and/or air conditioning device according to the present invention in one mode of operation;

Figure 2 is a detailed view of Figure 1 showing the device in another mode of operation;

Fig. 3 is a schematic side view showing another part of the heating, ventilation and/or air conditioning device;

Fig. 4 is a perspective view showing another part of the heating, ventilation and/or air conditioning device.

Detailed ways

FIG. 1 shows a heating, ventilation and/or air-conditioning device 2 according to the invention, comprising a housing 4 accommodating means for the thermal treatment of the air flow to be distributed to the interior of the vehicle. As shown in FIG. 1 , the housing 4 includes a first flow duct 4 a for the first air flow Fa and a second flow duct 4 b for the second air flow Fb. However, the present invention is not limited to this embodiment, and can be applied to a case including only a single air flow duct.

According to the invention, the housing 4 comprises a separating partition 5 arranged inside the housing 4 in order to separate the first flow duct 4a from the second flow duct 4b.

The heat treatment device comprises a first heat exchanger 6 , for example a radiator, for heating part of the air flow circulating in the heating, ventilation and/or air conditioning device 2 . A first heat exchanger 6 is arranged in the first flow conduit 4a and in the second flow conduit 4b, and said heat exchanger 6 is common to both flow conduits 4a, 4b.

The heat treatment device also includes a second exchanger 8 corresponding to the electric radiator for faster warming of the air flow, especially when the vehicle is started. The second heat exchanger 8 is arranged downstream of the first heat exchanger 6 with respect to the air flow. The second heat exchanger is arranged in a single flow duct, in which case the second heat exchanger 8 is only arranged in the second flow duct 4b.

The heat treatment device also comprises a third heat exchanger 10 , for example an evaporator, arranged upstream of the first heat exchanger 6 with respect to the flow direction of the gas flow. The third heat exchanger 10 is used to cool and dehumidify all airflows circulating in the heating device. A third heat exchanger 10 is arranged in the first flow conduit 4a and in the second flow conduit 4b, and said heat exchanger 10 is common to both flow conduits 4a, 4b.

The air flow is introduced into the housing 4 via an inlet (not shown) and then, after being heat-treated by heat exchangers 6, 8, 10, directed towards an outlet by means of a blower (not shown).

The outlet consists of several ducts that distribute the airflow to nozzle openings leading to different areas of the vehicle interior. The outlet comprises in particular a first outlet duct 12 which directs the air flow to the footwell nozzles so that the feet of the passengers in the front and possibly the rear of the vehicle can be warmed. The outlet also includes a second outlet duct 14 which delivers an air flow to the defroster nozzles, making it possible to defog the windscreen. The outlets comprise a third outlet duct 16 which delivers an air flow to the lateral/central ventilation nozzles, making it possible to cool/heat the passengers at the front of the vehicle. The outlet may also comprise a fourth outlet duct 18 for directing the air flow to the rear area of the vehicle so that the passengers in the rear of the vehicle may be cooled/heated. Each outlet duct comprises an inlet opening which can be at least partially closed by a shut-off door.

According to the invention, the device comprises a fourth door 34, which will be described later.

According to the invention, the device comprises a first door 20 arranged downstream of the second heat exchanger 8 and abutting in one extreme position against the separating partition 5 or against the second heat exchanger 8 . As shown in FIG. 1 , the first door 20 is butterfly-shaped, ie it includes a rotation shaft arranged at the center of the blade P or a rotation shaft arranged between two blades. A first door 20 is arranged at 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 of the first outlet duct 12 . As shown in FIG. 1 , the first door 20 is butterfly-shaped, with an axis of rotation 20c arranged between two leaves 20a, 20b, which in this case lie in two different planes. Clearly, both blades can lie on the same plane. The first vane 20 a is able to close or open the inlet of the first outlet duct 12 . The second vanes 20b are able to guide the air flow leaving the first or second heat exchanger 6 , 8 .

The first door 20 pivots between two extreme positions in which the first door 20 , more specifically the second vane 20 b , abuts against the separating partition 5 and/or the second heat exchanger 8 , in the second extreme position, the first door 20 , more specifically the second blade 20 b , abuts against the wall of the housing 4 . Of course, the first door 20 can assume any intermediate position between these two extreme positions.

In the first extreme position shown in FIG. 2, the first door 20, in particular the second blade 20b, abuts against the separating partition 5, while the first blade 20a abuts against the wall of the housing 4, in particular against the first The walls of the outlet duct 12 are such that the flow of air that can circulate in the first outlet duct 12 is maximized.

In the second extreme position shown in Figure 3, the first door 20, 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 air flow can An outlet pipe 12 circulates.

According to the invention, the heating, ventilation and/or air-conditioning device also comprises an air flow guide wall 22 arranged in the first flow duct 4a for the air flow Fa and arranged at the first heat flow with respect to the flow of the air flow. Downstream of exchanger 6. The airflow guide wall 22 guides the first airflow Fa toward the first door 20 .

Thus, according to the invention, the hot first air flow Fa which has passed through the first heat exchanger 6 is directed towards the first door 20 and thus to the first outlet duct 12 for the foot of the vehicle interior. area of space.

As a result of this orientation, the majority of the flow of the heated first air flow Fa is directed towards the footwell outlet duct 12 .

However, according to the invention, it is the majority but not the entire flow of the heated first air flow Fa that is directed towards the footwell outlet duct 12 . In particular, there is always a portion of the first air flow Fa able to flow towards the second and/or third outlet duct 14 , 16 .

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

As previously mentioned, the first door 20 is pivoted to an intermediate position I shown in FIG. 1 , which is located between two extreme positions. The airflow guide wall 22 extends substantially in the direction P, and the first door, in particular the second vane 20b, extends substantially in the direction V. As shown in FIG. As shown in Figure 1, directions P and V are substantially aligned at this intermediate position. In other words, the second vane 20b is in the continuation of the airflow guiding wall 22 while leaving a space 24 between the two elements.

In said intermediate position, the space 24 between the end of the airflow guide wall 22 and the end of the first door 20 (in particular the end of the second vane 20b) is 5mm and 25mm, preferably between 10mm and 15mm.

The presence of this gap 24 thus ensures that a part of the first air flow Fa which has passed through the first heat exchanger 6 can always be conveyed towards the second and/or third outlet duct 14 , 16 .

The first flow duct 4a for the first gas flow Fa and the second flow duct 4b for the second gas flow Fb each comprise a bypass path 26, 28 bypassing the first heat exchanger 6, which bypass paths 26, 28 Arranged on both sides of the first heat exchanger 6 .

According to the invention, a butterfly-shaped second door 30 is arranged in the first flow duct 4a for the first air flow Fa, and a sliding vane-type third door 32 is arranged in the second flow duct 4b for the second air flow Fb , said door is arranged between the first heat exchanger 6 and the third heat exchanger 10, so as to guide each respective air flow Fa, Fb through the respective bypass path 26, 28 and/or through the first heat exchanger 6.

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 flow Fa into the first heat exchanger 6 Passage, in the second extreme position, the second door 30 maximizes the passage of the air flow Fa into the first heat exchanger 6 . The first flow duct 4 a for the first air flow Fa also comprises a further door, namely a fourth door 34 , also butterfly-shaped, arranged in a 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 around the first heat exchanger 6, in the second In the extreme position, the fourth door 34 obstructs the flow of the first airflow Fa in the bypass path 26 the least.

According to the invention, the housing 4 comprises a shielding element 42 arranged at one end of the fourth door 34 . Said shielding element 42, commonly referred to as a progression tip, has a shape complementary to the travel of the fourth door 34 and extends at least partially over part of the travel of the door. In other words, the housing 4 comprises a shielding element 42 or shield closely following the curved trajectory of the fourth door 34 . It can also be said that the shielding element 42 is at least partially recessed, the fourth door moving within the recess. In particular, the fourth door 34 corresponds to a butterfly door pivoting about an axis of rotation arranged between two blades or at the center of a single blade so that one or more blades adopt a circular trajectory and move from one extreme position to (In this extreme position, they abut against the housing 4 to prevent the flow of air flow along the bypass path 26) to the other extreme position (in this extreme position, they hinder the air flow the least).

By opening the fourth door 34 or pivoting several angles, an influx of air is created, in which cold air is sucked towards the distributor, which is not conducive to a good mixing with the warm air, as a result, the defrost outlet or ventilation outlet is larger than the vehicle The set point temperature given by the passenger is cooler.

Thus, the shading element 42 makes it possible to create a dead zone, so that the amount of cold air can be better calibrated to the temperature progression.

According to the invention, the fourth door 34 is butterfly-shaped and the shielding element 42 is arranged in an upstream part of the housing 4 with respect to the flow of the air flow, with respect 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 with respect to the flow of the air flow.

According to the invention, the housing 4 comprises a second shielding element 45 arranged at the other end of the door 34 . In the same way, the second shielding element has a shape complementary to the stroke of the leaf of the door, or in other words, the second shielding element is at least partially concave, so that it also creates a dead zone.

As shown in FIG. 1 , the second shielding element 45 is formed by a set of walls which are joined together or formed in one piece and which also form the guide wall 22 .

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

According to the invention, the second shielding element 45 extends over at least 5% of the travel of the door, preferably over 10% to 30% of the travel of the door. In other words, the concave portion of the second shading element 45 extends at least in an angular range comprised between [0°, 10°], preferably between [0°, 10°], or even [0°, °, 30°] and between all intermediate values.

The third door 32 of sliding vane type slides between two extreme positions and can adopt any intermediate position. In the first extreme position, the third door 32 completely cuts off the passage of the airflow Fa into the first heat exchanger 6. In the second extreme position, the third door 32 completely cuts off the corresponding bypass path 28 .

Obviously, the invention is not limited to the type of first, second, third or fourth door 20 , 30 , 32 , 34 . Each door can correspond to a butterfly door, a drum door, a hinged-ended flag door (the axis of rotation is at one end of the blade), or a sliding leaf door.

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

The first door 20 is associated with the first outlet duct 12 . A fifth door 36 , in this case of the hinged-ended flag type, is associated with the second outlet duct 14 leading air to defroster nozzles near the windscreen of the vehicle. The fifth door 36 is able to completely close the second outlet duct 14 . A sixth door 38 , in this case of the drum door type, is associated with the third outlet duct 16 which leads the air towards the central/side ventilation nozzles. The sixth door 38 cannot completely close the third outlet duct 16 . In particular, the sixth door 38 has cutouts (not shown) on its lateral sides, so that even when the sixth door 38 is in the extreme position of closing the third outlet duct 16, it is always guaranteed to represent 10% of the maximum flow rate. magnitude of air leaks. Furthermore, a seventh door 40 (butterfly in this case) is associated with a fourth outlet duct 18 leading air to the ventilation nozzles for the passengers at the rear of the vehicle. The seventh door 40 is able to completely close the fourth outlet duct 18 .

The configuration of the sixth door 38 makes it possible to ensure that the air flow can always be directed towards the side windows of the vehicle and to allow these side windows to be defrosted or defogged. This is particularly advantageous in defrost mode (see [0062]), in which mode the sixth vent door 38 is in the extreme closed position, but the windows of the vehicle can still be defrosted or defogged.

The first, fifth, sixth, and seventh doors are called distribution doors or baffles, while the second, third, and fourth doors are called blend doors or baffles.

The device 2 according to the invention may comprise a mechanism for synchronizing the doors, wherein the flap of the seventh door 40 may be rotatably connected to the flap of the sixth door 38 , for example by means of a linkage.

This arrangement of the heating, ventilation and/or air conditioning device 2 according to the invention means that several modes of operation can be utilized as described below. Only the dispense doors or flaps will be described, as well as the blend doors or flaps depending on the temperature set points indicated by the front and/or rear passengers.

Footwell mode: In footwell mode, as shown in FIG. 2 , the first door is in a position in which the first outlet duct 12 is opened, or in other words, the first door 20 abuts against the partition wall 5 and/or the second Two heat exchangers 8. The fifth door 36 is in a partially closed position (80% closed), the sixth door 38 is in a position where the third outlet duct 16 is closed, and the air leakage reaches 10% of the maximum flow, and the seventh door is in a position where the fourth outlet duct 18 is completely closed. closed position.

Double layer mode: in this mode the first door 20 is in the intermediate position I, in which the second vane 20b is in the continuation of the guide wall 22 which guides the heated first air flow Fa, as shown in Figure 1 . The fifth door 36 is in a position in which the second outlet duct 14 is closed, while the sixth door 38 and the seventh door 40 are in an intermediate open position, that is to say in a position in which each respective outlet duct 16, 18 is closed and enables Positions between their open positions, although the sixth door 38 may be in a wide open position.

Footwell/Defrost Mode: In this mode, the first door 20 and the fifth door 36 are in an intermediate position, the sixth door 38 and seventh door 40 are in a position such that each respective outlet duct 16, 18 is closed, And in the case of the sixth door 38 there is an air leak.

Ventilation mode: the sixth door 38 and the seventh door 40 are in a position to open each respective outlet duct 16, 18, the first door 20 and the fifth door 36 are in a position to close each respective outlet duct 12, 14 .

Defrost mode: only the fifth door 36 is in the position to open the outlet duct 14, the other dispensing doors are in the position to close each respective duct.

The table below summarizes the various modes. For each mode, footwell, defrost, etc., there are two rows, the first row corresponds to the indicated degree of door opening (in percent), where 100 corresponds to the maximum degree of opening, in other words, the resistance of the door to airflow The smallest extreme position, 0, corresponds to how closed the corresponding ducts are, these are recorded on the left, and the gates are recorded according to how open they are and the flow through them. The second row corresponds to the air flow (percentage of total air flow) circulating through the corresponding airflow duct.

Thus, according to the invention, it is possible to have multiple operating modes and more hot air is directed to the footwell.

Figure 3 shows the intake housing. The device comprises an air intake housing and a blower (or electric fan unit) notably having a single impeller, in other words an impeller 54 equipped with blades, rotatable about axis A. The device 2 comprises a tubular member 56 capable of defining a first air circulation channel 58 and a second air circulation channel 60 allowing the flow of a first air flow intended to flow through the first axial portion of the impeller 54b , the second air circulation channel 60 allows the flow of the second air flow intended to flow through the second axial portion of the impeller 54a. A tubular member 56 is mounted at the location of the first end of the impeller 54 and defines an interior space or volume forming at least part of a first air flow passage 58 and a second air flow passage 60 extending outside of the tubular member 56 . The device 2 also includes an air inlet housing covering the first end of the impeller 54 and the tubular member 56 . The air intake housing comprises guide means capable of guiding the first air flow into the first air flow channel 58 and of the second air flow into the second air flow channel 60 . When the device 2 is installed in a vehicle, the axial parts of the impellers 54a, 54b may for example be made with reference to the vertical axis of the vehicle.

For this purpose, the air intake housing can, for example, comprise a first air inlet and a second air inlet, one for recirculated air and one for fresh air, and also 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 circulation passage 58 . Two lateral drum doors are arranged to allow air communication between the air inlet and the second air circulation channel 60 . The intake housing 14 may also include an air filter through which the first and second airflows will pass.

The impeller 54 is arranged in a blower housing 62 , the outlet of which comprises two flow ducts 4 a , 4 b separated by a partition wall 13 corresponding to a part of the separating partition 5 . In other words, the first air circulation passage 58 directs the airflow to the first axial portion of the impeller 54 b, thereby leading to the second flow duct 4 b, while the second air circulation passage 60 directs the airflow to the second axial direction of the impeller 54 Portion 54a, thus leading to the first flow conduit 4a.

The blower, ie, one or more bladed impellers 54 , is contained in a helical portion of the housing, commonly referred to as the blower housing 62 . Airflow drawn by the one or more bladed impellers 54 is directed towards the walls of the blower housing 62 and thus closely follows the circular trajectory defined by these walls. The blower housing 62 then has a blower housing outlet in the form of a straight duct so that the airflow leaving the blower housing 62 follows the same direction.

The part 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 the 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 .

The device 2 comprises a separating partition 5 separating or delimiting the two flow ducts 4a, 4b with respect to each other. The separating partition may be made in one piece and extend within the heating, ventilating and/or air-conditioning unit 2, with orifices to allow the introduction of the various heat exchangers 6, 8, 10, or the separating partition may be several parts or modules. There may be 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 section extending above the second heat exchanger 8. the third part.

The separation separator 5 according to the present invention is not limited to any particular shape. A separating partition corresponds to an element capable of separating or delimiting the two flow ducts 4a, 4b. As shown in Figures 1 and 3, the first portion corresponds to a planar wall. Here, the second part corresponds to a unit, that is to say a collection of walls defining an uneven or non-planar shape, with an adjoining element against which the second blend door 30 can rest, or in a position designed to accommodate at least partially the third blend door 30 . Between the spaces of the blend door 32 . The third part corresponds to an omega-shaped wall with a space to accommodate the second heat exchanger 8 and an adjoining element against which the first door 20 , in particular the second vane 20 b bears.

The device 2 may comprise an air inlet housing 19 as shown in FIG. 4 . In this case, the air intake housing 19 comprises at least two different air inlets 15, 17 extending across the air intake housing width (d2), and air guide members 77, 78, 79, the air guide members 77, 78 , 79 are configured to guide at least the airflow that is admitted into the intake housing 19 .

The air guiding member comprises at least three coaxial doors 77, 78, 79, which are a central door 77 and two side doors 78, 79 arranged on each side of the central door 77, said coaxial doors 77, 78, 79 being arranged at between said two different air inlets 15 , 17 of the air intake housing 19 in order to be able to move about a single pivot 80 . The central door 77 extends over a portion of said width of the intake housing 19 that is greater than or equal to the portion of the width over which the two side doors 78 , 79 extend.

Said coaxial doors 77, 78, 79 are of the drum door type and are each arranged to have the ability to move between a first extreme position and a second extreme position in which said The doors 77 , 78 , 79 close the first air inlet 15 , and in a second extreme position said doors 77 , 78 , 79 close the second air inlet 17 .

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

In this way, the fresh air flow FE can flow through the blower through the first air inlet 15 to be directed inside the tubular member 56 and to the first axial portion of the impeller 54b to emerge in the second flow duct 4b; and The recirculation air flow FR may also flow through the blower through side doors 78, 79 which direct the recirculation air flow FR to the outside of the tubular member 56 so as to reach the second axial portion of the impeller 54a and thus appear in the first flow In pipeline 4a.

Claims (10)

1. A heating, ventilation and/or air conditioning device (2) for a motor vehicle comprising a housing (4) comprising: a first heat exchanger (6); a bypass path (26), bypassing said first heat exchanger (6); and a gate (34), positioned in said bypass path (26), It is characterized in that the housing (4) includes a shielding element (42) arranged at one end of the door (34), the shape of the shielding element (42) is complementary to the stroke of the door (34) and extending at least partially over a portion of the travel of the door. 2. The device (2) according to claim 1, wherein said door (34) is of the butterfly type and said shielding element (42) is arranged relative to said door (34), relative to the flow of the air flow in the upstream portion of the housing. 3. The device (2) according to claim 2, wherein the housing (4) comprises a second shielding element (45) arranged at the other end of the door (34). 4. The device (2) according to one of the preceding claims, wherein the shielding element (42) extends over at least 10% of the travel of the door (34), preferably over the The door (34) is extended over 20% to 50% of said travel. 5. The device (2) according to any one of claims 3 and 4, when dependent on claim 3, wherein said second screening element (45) is within said travel of said door (34) extending over at least 5% of said travel of said door (34), preferably over 10% to 30% of said travel of said door (34). 6. The device (2) according to one of the preceding claims, wherein the housing (4) comprises: a first flow duct (4a) for a first gas flow (Fa); a second flow duct (4b) for a second gas flow (Fb); a separating partition (5, 13) arranged inside said housing (4) to separate said first flow conduit (4a) from said second flow conduit (4b); The 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 two flow pipes (4a, 4b); and A second heat exchanger (8) is arranged downstream of said first heat exchanger (6) with respect to the flow of the gas flow and is arranged in a single flow duct (4a, 4b). 7. The device (2) according to claim 6, wherein the device (2) comprises a third heat exchanger (10) arranged upstream of the first heat exchanger (6) with respect to the flow of the gas stream ), the third heat exchanger (10) is arranged in the first flow conduit (4a) and the second flow conduit (4b), and the third heat exchanger (10) is two flows Common to the pipes (4a, 4b). 8. The device (2) according to any one of claims 6 and 7, wherein the first flow duct (4a) of the gas flow and the second flow duct (4b) of the gas flow each comprise Bypass paths (26, 28) of the first heat exchanger (6), the bypass paths (26, 28) being arranged on each side of the first heat exchanger (6). 9. The device (2) according to claim 8, wherein a second door (30) is arranged in said first flow duct (4a) for the air flow and a third door (32) is arranged in the In the second flow duct (4b) of the , the door is arranged between the first heat exchanger (6) and the third heat exchanger (10) in order to guide each respective air flow (Fa, Fb ) through respective bypass paths (26, 28) and/or through said first heat exchanger (6). 10. A motor vehicle, characterized in that it comprises a heating, ventilation and/or air conditioning device (2) according to any one of the preceding claims.

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