FR3092525A1 - Heating, ventilation and / or air conditioning device for a motor vehicle - Google Patents

Abstract

Heating, ventilation and / or air conditioning device for a motor vehicle The invention relates to a heating, ventilation and / or air conditioning device (1) for a motor vehicle, comprising a housing (2) defining a flow channel (3) for an air flow, in which are arranged a first heat exchanger (4), a second heat exchanger (6), a bypass path (28) of the second heat exchanger (6) and at least one outlet duct air (12,14,16), each air outlet duct (12,14,16) being configured to guide the air flow in particular to different regions of a vehicle interior. According to the invention, one of the air outlet ducts (16) runs along a wall (5) of the flow channel (3) so as to direct the air flow in a direction substantially opposite to the direction of the air flow. air as it passes through the first heat exchanger (4). Figure for the abstract: Fig. 2

Description

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

The invention relates to the field of heating, ventilation and/or air conditioning devices for motor vehicles as well as a motor vehicle comprising such a device.

A motor vehicle is commonly equipped with a ventilation, heating and/or air conditioning device to regulate the aerothermal parameters of a flow of air distributed towards the interior of the passenger compartment of the vehicle. The device generally comprises a casing delimited by partitions in which openings are made, including 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 casing also houses heat treatment means for heating and/or cooling the flow of air prior to its distribution inside the passenger compartment. By way of example, the heat treatment means may comprise an evaporator which is intended to cool and dehumidify the flow of air passing through it, as well as a radiator, possibly associated with an additional radiator, which is intended to heat the flow of air passing through it.

It is known, in these devices, to have an evaporator arranged downstream of the air inlet, so that the entire flow of air entering inside the case is dehumidified by the evaporator. Then, the flow of cold air thus generated is admitted into a main mixing chamber and/or directed towards a heating device, in particular a radiator and possibly an additional radiator, to obtain a flow of hot air. The main mixing chamber is used to mix one or more cold and/or hot air flows so that the air flow resulting from the mixture, having the desired setpoint temperature, is distributed to specific areas of the passenger compartment of the motor vehicle. The main mixing chamber is provided with at least one mixing device in order to define the proportion of the flow of cold air and the flow of hot air coming from the heating chamber entering the main mixing chamber. This device thus makes it possible to adjust the temperature of the mixed air flow intended to be distributed in the dedicated zone(s) of the passenger compartment, such as for example the front and rear zones, or left and right in the passenger compartment of the motor vehicle.

Although such a heating, ventilation and/or air conditioning device makes it possible to achieve ventilation management for several areas of the vehicle, there are however numerous constraints in terms of volume and weight for these devices. Indeed, the heating, ventilation and/or air conditioning devices are generally arranged under the dashboard of the motor vehicle, this involves raising the dashboards, thus limiting the driver's visibility.

The present invention aims to optimize the vertical steric bulk of a heating, ventilation and/or air conditioning device.

For this, the invention proposes a heating, ventilation and/or air conditioning device for a motor vehicle, comprising a casing defining a flow channel for an air flow, in which are arranged a first heat exchanger, a second heat exchanger of heat, a bypass path of the second heat exchanger and at least one air outlet duct, each air outlet duct being configured to guide the flow of air in particular towards different regions of a vehicle passenger compartment, characterized in that one of the air outlet ducts runs along a wall of the flow channel so as to orient the flow of air in a direction substantially opposite to the direction of the flow of air when it crosses the first exchanger heat.

In this way, the invention makes it possible to have a heating, ventilation and/or air conditioning device that is less bulky than those of the prior art. Indeed, the fact of arranging two shutters comprising sliding doors at different locations of the heating, ventilation and/or air conditioning device makes it possible to limit the height of said device in an optimal manner.

1. le boitier comprend une entrée d’air et ledit conduit de sortie d’air est agencé sur la partie du boitier opposée à ladite entrée d’air ;
2. ledit conduit de sortie d’air est configuré pour guider un flux d’air vers une buse destiné à déboucher dans l’habitacle au niveau des pieds des passagers du véhicule ;
3. un volet de distribution comprenant un volet de type papillon est agencé de manière à pouvoir obturer au moins partiellement le conduit de sortie d’air ;
4. le conduit de sortie d’air est défini d’une part par une paroi du boitier définissant le canal d’écoulement et d’autre part par une autre paroi externe agencée à l’extérieur du canal d’écoulement ;
5. un volet de mixage comprenant une porte coulissante est agencé dans le canal d’écoulement de manière à pouvoir obturer le chemin de contournement et/ou le deuxième échangeur de chaleur (6) et un deuxième volet de distribution comprenant une porte coulissante est agencé de manière à pouvoir obturer au moins partiellement un autre desdits conduits de sortie d’air ;
6. la buse est agencée en dessous du premier échangeur de chaleur par rapport à l’axe vertical Z ;
7. le deuxième volet de distribution est agencé de manière à pouvoir obturer le conduit d’air de sortie configuré pour guider le flux d’air vers une buse de ventilation ;
8. un premier volet de distribution comprenant un volet de type drapeau est agencé de manière à pouvoir obturer au moins partiellement un deuxième desdits conduits de sortie d’air ;
9. le deuxième conduit de sortie d’air est configuré pour guider un flux d’air vers la buse des pieds ;
10. un troisième volet de distribution comprenant un volet de type papillon est agencé de manière à pouvoir obturer au moins partiellement un troisième desdits conduits de sortie d’air ;
11. le troisième conduit de sortie d’air est configuré pour guider un flux d’air vers la buse de dégivrage ;
12. les premier et deuxième échangeurs de chaleur forment un angle compris dans un intervalle de 40° à 120 ;
13. le boîtier est de forme allongée et dans lequel un pulseur, le premier et le deuxième échangeurs de chaleur sont alignés dans un axe transversal dudit boîtier, le premier et le deuxième échangeurs de chaleur étant alignés dans un axe longitudinal dudit boîtier.

Particular embodiments according to the invention propose that:

1. the box comprises an air inlet and said air outlet duct is arranged on the part of the box opposite to said air inlet;
2. said air outlet duct is configured to guide a flow of air towards a nozzle intended to emerge in the passenger compartment at the level of the feet of the passengers of the vehicle;
3. a distribution shutter comprising a butterfly-type shutter is arranged so as to be able to at least partially close off the air outlet duct;
4. the air outlet duct is defined on the one hand by a wall of the housing defining the flow channel and on the other hand by another outer wall arranged outside the flow channel;
5. a mixing flap comprising a sliding door is arranged in the flow channel so as to be able to close off the bypass path and/or the second heat exchanger (6) and a second distribution flap comprising a sliding door is arranged so to be able to close at least partially another of said air outlet ducts;
6. the nozzle is arranged below the first heat exchanger relative to the vertical axis Z;
7. the second distribution flap is arranged so as to be able to close off the outlet air duct configured to guide the flow of air towards a ventilation nozzle;
8. a first distribution shutter comprising a flag-type shutter is arranged so as to be able to close off at least partially a second of said air outlet ducts;
9. the second air outlet duct is configured to guide a flow of air towards the foot nozzle;
10. a third distribution flap comprising a butterfly-type flap is arranged so as to be able to close off at least partially a third of said air outlet ducts;
11. the third air outlet duct is configured to guide a flow of air towards the defrost nozzle;
12. the first and second heat exchangers form an angle within a range of 40° to 120;
13. the casing is elongated and in which a pulser, the first and the second heat exchangers are aligned in a transverse axis of said casing, the first and the second heat exchangers being aligned in a longitudinal axis of said casing.

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

An aspect according to the invention provides that the second heat exchanger is arranged substantially horizontally with respect to the vehicle in the mounted state and that the first heat exchanger is arranged substantially vertically with respect to the vehicle in the mounted state. mounted.

Other characteristics and advantages of the invention will become apparent on reading the following description, with reference to the appended figures, which illustrate:

The [Fig. 1] illustrates a perspective view of the heating, ventilation and/or air conditioning device according to the invention;

The [Fig. 2] illustrates a side view of part of the heating, ventilation and/or air conditioning device according to the invention;

The [Fig. 3] illustrates a perspective view of part of the heating, ventilation and/or air conditioning device.

The following achievements are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference is to the same embodiment, or that the features apply only to a single embodiment. Simple features of different embodiments can also be combined or interchanged to provide other embodiments.

The terms “upstream” and “downstream” always refer to the flow of an air flow circulating within the heating, ventilation and/or air conditioning device.

On the [Figs. 1] and [Fig. 2] is schematized a trihedron XYZ where a longitudinal axis X of the heating, ventilation and/or air conditioning device 1 can correspond to the front/rear longitudinal axis of the vehicle. A transverse axis Y of the heating, ventilation and/or air conditioning device 1 may correspond to the right/left transverse axis of the vehicle, and a vertical axis Z of the heating, ventilation and/or air conditioning device 1 may correspond to the axis vertical top / bottom of the vehicle, each axis being perpendicular to each other in particular when the device 1 for heating, ventilation and / or air conditioning is installed in the motor vehicle.

To obtain a heating, ventilation and/or air conditioning device with low vertical steric bulk, the invention as illustrated in [Fig. 1], the invention proposes a device 1 for heating, ventilation and/or air conditioning comprising a housing 2 of elongated shape defining a flow channel for an air flow intended to be distributed in the passenger compartment in which are housed means of heat treatment of the air flow. In other words, as illustrated in [Fig. 2], the box 2 defines thanks to the walls 5 a flow channel 3, or a flow duct, to convey a flow of air from an air inlet to an air outlet.

The heat treatment means comprise a first heat exchanger 4, for example an evaporator, intended to cool and dehumidify the entire flow of air circulating in the flow channel 3.

The heat treatment means also comprise a second heat exchanger 6, for example a radiator, intended to heat part of the flow of air circulating in the device 1 for heating, ventilation and/or air conditioning, and is arranged downstream, with respect to to the flow of the air flow, from the first heat exchanger 4. The second heat exchanger 6 can optionally be coupled to an additional electric heater intended to heat the air flow more quickly, in particular when starting the vehicle.

The air flow is introduced into the housing 2 via at least one air inlet 10 then is directed via a blower which for this purpose comprises a motor and a blade wheel. The blower conveys the flow of air from the air inlet 10 to at least one outlet, after having been heat treated by the heat exchangers 4, 6. The air inlet 10 corresponds to an air inlet box comprising two openings, an outside air inlet 35 and a recycling air inlet 37 as illustrated in [Fig. 3]. A shutter can be arranged between the two openings to at least partially close each one. The air inlet 10 is arranged on the upper part with respect to the vertical axis Z of the device 1 for heating, ventilation and/or air conditioning.

The outlet includes several outlet ducts shown in [Fig. 2] distributing the airflow to nozzles emerging in different regions of the passenger compartment. Each air outlet duct includes a mouth corresponding to the inlet of the air outlet duct. The outlet notably comprises a first air outlet duct 12 configured to lead the flow of air towards the de-icing nozzle, thus making it possible to demist the windshield. The outlet further comprises a second air outlet duct 14 capable of bringing the air flow to the side/central ventilation nozzles, thus making it possible to cool/heat the passengers of the vehicle. Finally, the outlet comprises a third air outlet duct 16 directing the air flow towards the foot nozzle allowing the feet of the front passengers of the vehicle to be cooled/heated. As illustrated in [Fig. 2], the inlets of two outlet ducts 12,14 capable of leading the air flow to the ventilation and defrost nozzles are coplanar. In other words, the entries of these two ducts 12,14 are inscribed in the same plane.

The third air outlet duct 16 has a particular shape where the duct runs along the flow channel 3 in the lower part, relative to the vertical axis Z of the device 1 for heating, ventilation and/or air conditioning. It can also be said that the air outlet duct 16 is arranged on the part of the box 2 opposite the air inlet 10, or that the air outlet duct 16 runs along the lower or outer surface of the housing 2 of the heating, ventilation and/or air conditioning device 1, more precisely the air outlet duct 16 runs along the lower surface of the wall 5 of the housing 2 defining the flow channel 3. The wall 5 comprises an internal surface defining an internal volume corresponding to the flow channel 3 and an outer surface arranged outside the flow channel 3, the air outlet duct 16 runs along the outer surface of said wall 5. As illustrated in [Fig. 2], the third air outlet duct 16 extends from a mixing chamber 18 which will be described later to a nozzle 19, corresponding to the outlet of said third duct 16, opening into the area of the feet of the cabin. Said nozzle 19 is arranged below the first heat exchanger 4 with respect to the vertical axis Z. In other words, the third air outlet duct 16 comprises an inlet mouth arranged at the level of the zone of mixer 18, said duct 16 then extends along the walls 5 of the box 2, it can also be said that the duct is juxtaposed, or secured, to the wall 5 of the box 2 so as to convey the flow of air in one direction substantially opposite to the direction of the air flow passing through the first heat exchanger 4, finally said duct 16 brings the air flow to a nozzle 19 arranged below the evaporator 4. It can also be said that the duct air outlet 16 directs the flow of air from the mixing chamber 18 to the apron, or firewall, of the vehicle. The air outlet duct 16 can also be defined as conveying the air flow from the mixing chamber to the part of the box 2 opposite to the mixing chamber 18, or to the wall of the box 2 where is arranged the air inlet 10. It is thus understood that the air outlet duct 16 is defined on the one hand by a wall 5 of the box 2 defining the flow channel 3 and on the other hand by another external wall 33 arranged outside the flow channel 3. The flow channel 3 is defined here by the walls 5 of the box 2 and extends from the air inlet 10 to the mixing chamber 18 included. The outlet 19 of the third air outlet duct 16 and the first heat exchanger 4 are inscribed in the same transverse Y and longitudinal X planes and are offset with respect to the vertical axis Z of the device 1 for heating, ventilation and/or or air conditioning. It can also be said that the nozzle 19 is arranged below the evaporator with respect to the direction of extension of the evaporator 4. For this, the air outlet duct 16 comprises at least one elbow.

Of course, the invention is not limited to this specific embodiment. The outlet 19 of the third air outlet duct 16 and the first heat exchanger 4 are inscribed in close transverse Y and longitudinal X planes and are offset with respect to the vertical axis Z of the device 1 for heating, ventilation and/or or air conditioning as shown in [Fig. 2]. The term “close” is understood to mean that the evaporator 4 and the outlet 19 of the third outlet duct 16 are both arranged in the same half, in particular the same quarter, of the device 1 for heating, ventilation and/or air conditioning according to the longitudinal axis X.

A distribution flap is arranged at each mouth, or inlet, of the air outlet ducts 12,14, 16. Each distribution flap is configured to pass from a configuration where it completely closes off each outlet duct inlet of air to a configuration where it allows the flow of air to circulate entirely within the corresponding air outlet duct. Of course, each distribution flap is capable of adopting any intermediate position.

A first distribution shutter 20 of the flag type, corresponding to a door with a rotation shaft arranged at one of the ends of the door, is arranged at the level of the inlet of the first air outlet duct 12. A second shutter of distribution 22 of the sliding type, corresponding to a sliding door on which is arranged at least one rack. In order to set the second distribution flap 22 in motion, at least one gear 24 complementary to the rack is rotated around an axis by an actuator (not shown). The rotation of the gear 44 causes the movement in translation of the sliding door 22 between two extreme positions, a first extreme position where the second distribution flap 22 closes the inlet mouth of the second air outlet duct 14 and a second extreme position where the second distribution flap 22 allows the flow of cold air from the mixing chamber 18 to access within the second air outlet duct 14. A third butterfly distribution flap 26, corresponding to a shutter with a rotation shaft and one or two blades arranged on either side of the rotation shaft, is arranged at the level of the inlet of the third air outlet duct 16 and makes it possible to close or not the third air outlet duct 16.

The first heat exchanger 4 comprises two collecting chambers and a thermal bundle comprising a set of tubes or plates and it is considered here that the thermal bundle defines a plane E. The second heat exchanger 6 comprises two collecting chambers and a thermal bundle comprising a set of tubes or plates and it is considered here that the thermal beam defines a plane R.

It can also be said that the nozzle 19 is arranged at least partially in the plane E.

In order to gain in height, the second heat exchanger 6 is inscribed in a plane R which is orthogonal to the plane P of the air inlet of the volute. In other words, the second heat exchanger 6 is inscribed in a plane R substantially parallel to the axis of rotation of the pulser. Referring to the vehicle, the plane E of the first heat exchanger 4 corresponds substantially to the plane defined by the transverse and vertical axes YZ of the vehicle while the plane R of the second heat exchanger 6 corresponds substantially to the plane defined by the axes longitudinal and transverse XY of the vehicle. In other words, the second heat exchanger 6 is arranged substantially horizontally relative to the heating, ventilation and/or air conditioning device 1 or even relative to the vehicle once in the installed state. This allows a considerable gain in height.

In order to limit the steric constraints even more, the angle between the plane E of the first heat exchanger 4 and the plane R of the second heat exchanger 6 is included in an interval going from [40° to 120°].

According to the invention, the device 1 comprises an evacuation duct making it possible to guide the condensates towards the outside of the box 2. In order to reduce the height of the device, the evacuation duct is of flattened shape and extends in a direction substantially parallel to the plane R of the second heat exchanger 6. In other words, the exhaust duct has a flow channel having a section of oblong shape, as shown here, or any other shape whose width exceeds the height such as elliptical, rectangular, etc.

The flow of air entering the box is conveyed from the air inlet 10 through a volute corresponding to a spiral part of the box. The volute has an air inlet corresponding to an orifice present within the case, also called casing, in a spiral. The volute presents a radial evolution starting from a point N called the nose of the volute, over an angle range that can go from 0° to 360°. The volute then has a volute outlet in the shape of a straight duct so that the airflow exiting the volute follows this same shape. The air flow then emerges in a part called the divergent which corresponds to a part of the rectilinear flow channel 3 having an enlargement in height along the axis Z. The air flow flows through the divergent until to the first heat exchanger 4.

Once the air flow has been cooled by the first heat exchanger 4, it is guided within the flow channel 3 towards the second heat exchanger 6. According to the embodiment illustrated in FIG. 2, to guarantee that the flow of cold air, coming from the first heat exchanger 4, is not thermally contaminated by the second heat exchanger 6, the device 1 comprises a bypass path 28 of the second heat exchanger 6. Thus, the flow of cold air, having passed through the first heat exchanger 4, circulates either through the second heat exchanger 6 to be reheated, or bypasses the second heat exchanger 6 by the bypass path 28 in order to retain its low temperature.

The hot and cold air flows are then oriented towards a mixing zone 18 to be mixed there and distributed to the mouths, or inlets, of the outlet ducts 12,14,16 at the set temperatures. To produce this mixture in variable proportions, the device 1 comprises a mixing flap 30 making it possible to regulate the proportion of cold air flow passing through the second heat exchanger 6 and the proportion of cold air flow passing through the path bypass 28.

The mixing shutter 30 corresponds to a shutter of the sliding type, that is to say it comprises a sliding door on which is arranged at least one rack. In order to set the mixing flap 30 in motion, at least one gear 32 complementary to the rack is rotated around an axis by an actuator (not shown). The rotation of the gear 32 causes the movement in translation of the sliding door 30 between two extreme positions, a first extreme position where the mixing flap completely closes the bypass path 28 of the second heat exchanger 6 and a second extreme position where the mixing flap 30 closes off the air passage downstream of the second heat exchanger 6 so that the air flow having passed through the second heat exchanger 6 cannot access the mixing chamber 18.

The mixing flap 30 as illustrated in [Fig. 2] is arranged downstream of the second heat exchanger 6, however, that can be arranged between the first and the second heat exchanger 4.6.

The invention as it has just been described cannot be limited to the means and configurations exclusively described for a particular embodiment, and also applies to all combinations of these means or configurations, as well as to the equivalents and to any combination of such means or configurations with the equivalents.

Claims (10)

Device (1) for heating, ventilation and / or air conditioning for a motor vehicle, comprising a box (2) defining a flow channel (3) for an air flow, in which a first heat exchanger (4) is arranged. , a second heat exchanger (6), a bypass path (28) of the second heat exchanger (6) and at least one air outlet duct (12,14,16), each air outlet duct (12,14,16) being configured to guide the air flow in particular to different regions of a vehicle interior, characterized in that one of the air outlet ducts (16) runs along a wall (5) of the flow channel (3) so as to direct the air flow in a direction substantially opposite to the direction of the air flow as it passes through the first heat exchanger (4). Device (1) according to claim 1, wherein the housing (2) comprises an air inlet (10) and said air outlet duct (16) is arranged on the part of the housing (2) opposite to said inlet air (10). Device (1) according to claim 1, wherein said air outlet duct (16) is configured to guide an air flow towards a nozzle (19) intended to open into the passenger compartment at the level of the feet of the passengers of the vehicle. vehicle. Device (1) according to claim 1 or 2, in which a distribution flap (26) comprising a butterfly-type flap is arranged so as to be able to at least partially close the air outlet duct (16). Device (1) according to claim 1 to 3, in which the air outlet duct (16) is defined on the one hand by a wall (5) of the housing (2) defining the flow channel (3) and on the other hand by another external wall (33) arranged outside the flow channel (3). Device (1) according to one of the preceding claims, in which a mixing flap (30) comprising a sliding door is arranged in the flow channel (3) so as to be able to close the bypass path (28) and / or the second heat exchanger (6) and a second distribution flap (22) comprising a sliding door is arranged so as to be able to at least partially close off another of said air outlet ducts (12,14). Device (1) according to one of the preceding claims, wherein the first and second heat exchangers (4,6) form an angle within a range of 40 ° to 120 °. Device (1) according to one of the preceding claims, in which the housing (2) is elongated and in which a blower, the first and the second heat exchangers (4, 6) are aligned in a transverse axis (Y ) of said housing (2), the first and second heat exchangers (4, 6) being aligned in a longitudinal axis (X) of said housing (2). Device (1) according to one of claims 2 to 7, characterized in that the nozzle (19) is arranged below the first heat exchanger (4) with respect to the vertical axis Z. Motor vehicle characterized in that it comprises a device (1) for heating, ventilation and / or air conditioning according to one of the preceding claims.