EP3490826A1

EP3490826A1 - Heating, ventilation and/or air conditioning device for a motor vehicle

Info

Publication number: EP3490826A1
Application number: EP17758580.9A
Authority: EP
Inventors: Jan Liska; Philippe Pierres
Original assignee: Valeo Systemes Thermiques SAS
Current assignee: Valeo Systemes Thermiques SAS
Priority date: 2016-07-28
Filing date: 2017-07-18
Publication date: 2019-06-05
Also published as: CN109476204A; FR3054490B1; JP2019521907A; FR3054490A1; WO2018020105A1

Abstract

The invention relates to a heating, ventilation and/or air conditioning device (2) for motor vehicle comprising a first sliding flap (72) and a second sliding flap (74) which are able to close off at least three ducts (12, 14, 16), characterized in that the two sliding flaps (72, 74) overlap at least partially in one extreme position referred to as the position of overlap, each sliding flap (72, 74) being able to completely close off two ducts (12, 14, 16).

Description

DEVICE FOR HEATING, VENTILATION AND / OR AIR CONDITIONING FOR A VEHICLE

AUTOMOBILE

Technical Field of the Invention

The present invention relates to the field of heating, ventilation and / or air conditioning devices for a motor vehicle.

State of the prior art

A motor vehicle is commonly equipped with a ventilation device, heating and / or air conditioning to regulate the aerothermal parameters of a flow of air distributed to the interior of the passenger compartment of the vehicle. The device generally comprises a housing delimited by partitions in which openings are provided, 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 housing also houses heat treatment means for heating and / or cooling the air flow prior to its distribution inside the passenger compartment. By way of example, the heat treatment means 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 disposed downstream of the air inlet, so that all of the air flow entering the interior of the housing is dehumidified by the evaporator. Then, the cold air stream thus generated is admitted into a main mixing chamber and / or directed towards a heating element, in particular a radiator and optionally 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 streams so that the air flow from the mixture, having the desired set temperature, is distributed to specific areas of the passenger compartment of the vehicle. motor vehicle. The main mixing chamber is provided with at least one mixing device to define the proportion of the cold air flow and the flow of hot air from the heating chamber entering the main mixing chamber. This member thus makes it possible to adjust the temperature of the mixed air flow intended to be distributed in the dedicated area (s) of the passenger compartment, such as, for example, the front and rear zones, or left and right zones in the passenger compartment. cabin of the motor vehicle. However, this implies a kinematics of the complex heating, ventilation and / or air conditioning device.

Although such a heating, ventilation and / or air conditioning device makes it possible to conduct aeration 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 implies the raising of the dashboards thus limiting the visibility of the driver.

Presentation of the invention

The present invention aims to optimize the vertical steric hindrance of a heating, ventilation and / or air conditioning and this with optimized kinematics.

For this, the invention proposes a heating, ventilation and / or air conditioning device for a motor vehicle comprising a first sliding shutter and a second sliding shutter capable of closing off at least three ducts, characterized in that the two sliding shutters overlap at least partially. in an extreme position called overlap, each sliding shutter being able to completely close two ducts.

In this way, the invention makes it possible to have a heating, ventilation and / or air conditioning device that is less cumbersome than those of the prior art. Indeed, the sliding shutters are compact shutters moving on a given axis and not on two axes as for other types of shutters. This allows a considerable gain in height. In addition, by arranging two sliding shutters to close three ducts, the kinematics is greatly simplified.

Particular embodiments of the invention propose that:

in the said extreme position of overlap, the first and second sliding shutters simultaneously seal a single duct

the first and second sliding shutters completely overlap in said extreme covering position; that is, the sliding flap housings overlap and may allow the first and second flaps to simultaneously close a single duct in their extreme position; at least one of said sliding flaps comprises a first and a second gear, said gears being interconnected by a rod;

the rod is metallic and of rectangular section;

each sliding shutter comprises a sliding door on which is arranged at least one rack cooperating with a gear, said gears being located on either side of the sliding doors;

- the entrances of the conduits are written in the same plane;

the sliding doors move in a plane parallel to the plane of the duct entrances;

- In the device is included a heat exchanger inscribed in a plane, the sliding doors moving in a plane parallel to the plane of said heat exchanger and parallel to the plane of the entrances of the ducts.

The invention also relates to a motor vehicle comprising a heating, ventilation and / or air conditioning device as described above in which the second heat exchanger is arranged horizontally relative to the vehicle in the mounted state.

The motor vehicle according to the invention is such that the blower, the first and second heat exchangers are aligned in a transverse axis Y of the vehicle in the mounted state.

Brief description of the figures

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

FIG. 1 illustrates a truncated side view of the entire heating, ventilation and / or air conditioning device according to the invention;

Figure 2 illustrates a side view of a portion of the heating, ventilation and / or air conditioning device according to the invention;

FIG. 3 diagrammatically illustrates part of the heating, ventilation and / or air conditioning device according to the invention;

FIG. 4 illustrates a view from above of part of the heating, ventilation and / or air conditioning device according to the invention;

FIG. 5 illustrates a truncated side view of a part of the heating, ventilation and / or air conditioning device according to the invention;

FIGS. 6A to 6C schematically illustrate, in a side view, various embodiments of the device according to the invention; FIGS. 7A to 7C illustrate different modes of operation of the device according to the invention;

FIG. 8 illustrates a side view of a part of the heating, ventilation and / or air conditioning device according to the invention.

Detailed Description of the Embodiments

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

Figures 1 and 5 is schematized a XYZ trihedron where a longitudinal axis X of the device 1 for heating, ventilation and / or air conditioning is the longitudinal axis front / rear of the vehicle. A transverse axis Y of the heating, ventilation and / or air conditioning device 1 corresponds to the right / left transverse axis of the vehicle, and a vertical axis Z of the heating, ventilation and / or air conditioning device 1 corresponds to the vertical axis. / bottom of the vehicle, each axis being perpendicular to each other.

To obtain a heating, ventilation and / or air conditioning device with a small vertical steric hindrance, the invention as illustrated in FIG. 1, proposes a device 1 for heating, ventilation and / or air conditioning comprising a housing 2 defining a channel. flow 3 of an air flow in which are housed heat treatment means of the air flow intended to be distributed in the passenger compartment.

The heat treatment means comprise a first heat exchanger 4, for example an evaporator, for cooling and dehumidifying the entire flow of air flowing in the heating device 1.

The heat treatment means also comprise a second heat exchanger 6, for example a radiator, intended to heat a part of the air flow circulating in the heating, ventilation and / or air conditioning device 1, and is arranged downstream, with respect to to the flow direction of the air flow, the first heat exchanger 4. The second heat exchanger 6 may optionally be coupled to an electric heater 7 additional for heating the airflow faster, especially when starting the vehicle.

The flow of air is introduced into the casing 2 via at least one air inlet 10 and then is directed via a blower 8 to at least one outlet, after having been heat treated by the heat exchangers 4, 6, 7. Said outlet comprises several ducts illustrated in Figure 2 distributing air flows to nozzles opening into the passenger compartment including the conduit 12 leading the air flow to the defrosting nozzle allowing demisting the windshield, the duct 14 bringing the air flow to the side / central ventilation nozzle for cooling / heating the passengers of the vehicle, and the duct 16 directing the air flow to the foot nozzle allowing cool / warm the feet of the front passengers of the vehicle. As illustrated in Figure 2, the entries of the three ducts 12, 14, 16 leading the air flow to the ventilation nozzles, defrost and feet are coplanar. In other words, the inputs of the three ducts 12, 14, 16 are inscribed in the same plane parallel to the plane defined by the second heat exchanger 6. The second heat exchanger 6 comprises two collector chambers and a heat bundle comprising a set of tubes or plates and it is considered here that the heat beam defines a plane R which will be described later. By conduit is meant, for the conduits 12, 14, 16, a flow channel for the flow of air at the outlet of a mixing zone 15, also commonly known as a distribution chamber. The mixing zone 15 corresponds to a zone where a flow of fresh air from the first heat exchanger 4 (the evaporator) can be mixed with a hot air flow coming from the second heat exchanger 6 (radiator), the zone of mixing 15 is therefore arranged downstream of all the heat exchangers 4,6,7, in particular downstream of the second heat exchanger 6. Each duct 12, 14, 16 has an inlet arranged downstream of all the heat exchangers 4 , 6, 7, within the mixing zone 15, and extends to the nozzle arranged in the passenger compartment of the vehicle corresponding to the outlet of the conduit. In other words, there is no heat exchanger arranged within or downstream of the ducts 12, 14, 16 or interposed between the inlet and the outlet of the ducts 12, 14, 16.

The blower 8, illustrated in FIG. 3, comprises a motor 18 and a bladed wheel 20. The motor 18, which can be electric DC brushless. The motor 18 is integral with a transmission shaft 22 so that when the motor induces a pivoting movement, the transmission shaft 22 is rotated. The transmission shaft 22 is connected, via a hub 24, to a blade or to a plurality of blades arranged in a paddle wheel 20 thus making it possible to generate a flow of air when the transmission shaft 22, and therefore the impeller 20, are rotated. Thus, the blade wheel 20 rotates about an axis of rotation A, which will be called axis of rotation A of the blower 8, corresponding to the longitudinal axis of the transmission shaft 22.

The blower 8 is contained in a part of the casing 2, or casing, in the form of a spiral, commonly called volute 26 illustrated in FIG. 4, so that the inflow of incoming air F1 is directed towards the walls of the volute 26 , thus marrying the circular path defined by these walls as illustrated by the arrows F2. The volute 26 has an air inlet 28 corresponding to an orifice present in the spiral housing. The volute 26 has a radial evolution starting from a point N called the nose of the volute, over a range of angle Θ, here 360 °. The volute 26 then has a volute outlet 30 in the form of a straight duct so that the air flow exiting the volute 26 follows this same shape.

As illustrated in Figures 3 and 4, the air inlet 28 of the volute 26 is inscribed in a plane P which is orthogonal to the axis of rotation A of the blower.

In order to gain height, the second heat exchanger 6 is inscribed in a plane R which is orthogonal to the plane P of the air inlet 28 of the volute 26. In other words, the second heat exchanger 6 s inscribed in a plane R parallel to the axis of rotation A of the blower. Referring to the vehicle, the plane P of the air inlet 28 of the volute 26 corresponds 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 to the plane defined by the longitudinal and transverse axes XY of the vehicle. In other words, the second heat exchanger 6 is arranged horizontally relative to the device 1 for heating, ventilation and / or air conditioning or with respect to the vehicle once in the assembled state. This allows a considerable gain in height.

In order to limit the steric constraints even more, the first heat exchanger 4 is inclined with respect to a plane E orthogonal to the plane R of the second exchanger. More precisely, FIG. 5 illustrates a plane E which is orthogonal to the plane R in which the second heat exchanger 6 is inscribed. The plane E is also orthogonal to the plane P in which is inscribed the air inlet 28 of the volute 26. The first heat exchanger 4 is inclined relative to the plane E so as to effectively reduce the height of the device 1 for heating, ventilation and / or air conditioning. As illustrated in Figure 5, the blower 8, the first and second heat exchangers 4,6 are aligned in the transverse axis Y of the vehicle.

The first heat exchanger 4 comprises two collector chambers and a heat bundle comprising a set of tubes or plates. Considering that the beam The thermal plane defines a plane F as illustrated in FIG. 5, the angle between the plane F and the plane E being in a range from [20 ° to 60 °]. Similarly, the angle between the plane F of the first heat exchanger 4 and the plane R of the second heat exchanger 6 is in a range from [30 ° to 70 ^e ].

Figures 6A to 6C schematically illustrate such an arrangement in a side view. FIG. 6A corresponds to a steep inclination of the first heat exchanger 4 where the angle drawn between the plane F in which is inscribed the first heat exchanger 4 and the plane R in which is inscribed the second heat exchanger 6 is equal to 30 °. Similarly, and because of the orthogonality between the R and E planes as previously established, the angle drawn between the planes R and E is equal to 60 °. FIG. 6B corresponds to a small inclination of the first heat exchanger 4 where the angle drawn between the plane F in which is inscribed the first heat exchanger 4 and the plane R in which is inscribed the second heat exchanger 6 is equal to 70 °, in the same way that the angle drawn between the planes R and E is equal to 20 °. Obviously the invention is not limited to these two values and any embodiment with an angle between these two values falls within the scope of the invention as illustrated in FIG. 6C with an angle between the planes R and F equal to at 40 °. In one embodiment of the invention, the device 1 comprises a discharge duct 32 for guiding the condensates towards the outside of the casing 2. In order to reduce the height of the device, the evacuation duct 32 is of a shape flattened and extends in a direction substantially parallel to the plane R of the second heat exchanger 6 as illustrated in FIG. In other words, the exhaust duct 32 has a flow channel 35 having an oblong section, as illustrated here, or any other shape whose width exceeds the height such as elliptical, rectangular, etc.

According to another embodiment not illustrated, the device 1 for heating, ventilation and / or air conditioning has a bypass channel of the first heat exchanger 4. The air flow leaving the volute 26 is distributed in the flow channel 3 so that a part of the air flow can pass through the first heat exchanger 4 and the other part of the air flow can pass through the bypass channel. With such bypass means, it is possible to operate the compressor cyclically with better efficiency.

Once the air flow has been cooled by the first heat exchanger 4, or bypassed the first heat exchanger 4, it is guided within the flow channel 3 to the second heat exchanger 6 as shown in Figure 1 in a general direction in U. The device 1, having a minimum height of the horizontal inclination of the second heat exchanger 6, it is necessary to be able to deflect the air flow in a vertical direction Z so as to ensure a better distribution of the air flow over the entire surface of the second heat exchanger 6. The device 1 comprises a fixed deflector 64, namely a member for changing the direction of a flow located upstream of the second heat exchanger 6, corresponding to a fixed partition or a blading. It is noted here that the fixed deflector 64 comprises a curved section 66 located at a central zone, and two straight sections 68,70 located on either side of the curved section. Such an arrangement makes it possible to intercept and straighten the flow of air to the second heat exchanger 6 optimally. Obviously, the invention is not limited to the number of deflectors arranged within the device.

According to the embodiment illustrated in FIG. 2, in order to guarantee that the cold air flow coming from the first heat exchanger 4 is not thermally contaminated by the second heat exchanger 6, the device 1 also comprises a first and second bypass 34,36 of the second heat exchanger 6. The first and second bypass 34,36 are arranged at a distance from each other, especially on either side 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 heated, or bypasses the second heat exchanger 6 by the first and second bypass paths 34 , 36 to maintain its low temperature. The hot and cold air flows are then directed towards a mixing zone 15 to be mixed and distributed to the outlet nozzles at the temperatures recorded via the conduits 12, 14, 16. To achieve this mixture in variable proportions, the device 1 comprises a first flap 38 for regulating the proportion of cold air flow passing through the second heat exchanger 6 and the proportion of cold air flow passing through the first bypass path 34. The device 1 further comprises a second flap 40 for regulating the proportion of cold air flow passing through the second heat exchanger 6 and the proportion of cold air flow passing through the second bypass path 36. Such an arrangement is particularly advantageous since thanks to the two bypass paths 34,36 of the second heat exchanger 6, the cold air flow is divided into two sub-streams, thereby reducing e the pressure drops on the cold air circuit. Indeed, if the user wishes to have the de-icing zones and ventilated feet in cold air, it is advisable to guide the flow of cold air to the corresponding ducts 12, 16 via the first and second bypass 34 36. Since each duct can be supplied with fresh air by a path of corresponding bypass, this reduces the height of the mixing zone and thus reduce the height of the heating device 1.

The first flap 38 is of sliding type and comprises a sliding door 42 on which is arranged at least one rack. In order to put the first flap 38 in motion, at least one gear 44 complementary to the rack is rotated about an axis by an actuator not shown. The rotation of the gear 44 causes the translational movement of the sliding door 42 between two extreme positions, a first extreme position where the first flap 38 blocks the access of the cold air flow to the first bypass path 34 and a second extreme position where the first flap 38 blocks the access of the cold air flow to the second heat exchanger 6 to the maximum as shown in Figure 2.

The second flap 40, or regulating member, is of a different type than the first flap 38. As illustrated in the embodiment of FIG. 2, the second flap 40 comprises a pivoting flap 46, here a butterfly flap. Coupled with a sliding plate 50. Of course, any other type of flap such as a flap flag or drum is suitable for implementing the device 1 according to the invention. The use of a sliding plate is particularly well suited for the device 1 according to the invention since it corresponds to a means of regulating the flow of the airflow occupying little height and can be arranged closer to the second. heat exchanger 6, thus representing a gain in height.

The second flap 40 here comprises a butterfly flap 46, that is to say a flap comprising a rotation shaft 52 and one or two blades 54 arranged on either side of the rotation shaft 52. The butterfly flap 46 is connected to the sliding plate 50 via a movable rod 48 which synchronizes the movements of the butterfly flap 46 and the sliding plate 50. The movable rod 48 has at each end a connecting means suitable for connecting the connecting rod mobile 48 respectively to the butterfly flap 46 and the sliding plate 50. The first connecting means connects the butterfly flap 46 to the movable rod 48 and the second connecting means connects the sliding plate 50 to the movable rod 48. The first means of connection comprises at least one orifice arranged on the movable rod 48 in which is introduced at least one pin arranged on a wall of the butterfly flap 46. The pin is advantageously arranged on one end of the blades 54 of the butterfly flap 46 in such a way that e to have the most range of motion. Of course, the invention is not limited to this embodiment, the pin can be arranged on the movable rod 48 and the orifice on In the same manner, other securing means according to non-illustrated embodiments may be envisaged, for example the movable rod 48 may be overmolded at one end of the butterfly flap 46 or the butterfly flap 46. and the movable rod 48 form a single piece forming a continuity of material.

In the same way, the second connecting means connects the movable rod 48 to the sliding plate 50. The second connecting means comprises at least one orifice arranged on the movable rod 48 in which is introduced at least one pin arranged on an arm 56 , said arm 56 being itself fixed to the sliding plate 50. Obviously the invention is not limited to this embodiment, the pin can be arranged on the movable rod 48 and the orifice on the arm 56. in the same manner, other securing means according to non-illustrated embodiments may be envisaged, for example the movable rod 48 may be overmoulded at one end of the sliding plate 50, the movable rod 48 and the arm 56 may not form only one piece forming continuity of matter.

The actuator not shown by causing the rotation of the butterfly flap 46, therefore of the blade 54, causes the moving rod 48 to move. By this same movement, the sliding plate 50 is transposed between two extreme positions. The butterfly flap 46 and the sliding plate 50 are arranged so that in a first extreme position, illustrated in FIG. 2, the butterfly flap 46 completely blocks the access of the cold air flow to the second bypass path 36 while the sliding plate 50 passes the flow of air through the second heat exchanger 6, and in a second extreme position where the sliding plate 50 blocks as much as possible the access of the cold air flow to the second heat exchanger 6 while that the butterfly flap 46 passes the flow of cold air through the second bypass path 36.

It is therefore possible for the flaps 38, 40 to completely block access of the cold air flow, coming from the first heat exchanger 4, to the second heat exchanger 6 jointly in an extreme position.

In order to facilitate the displacement of the sliding plate 50, said plate further comprises a second arm 58 secured to it and comprising at its end a slidable pin within a rail 60, or a slide or groove, as shown in Figure 2, the rail 60 being arranged on a wall of the device 1 for heating, ventilation and / or air conditioning.

The heating, ventilation and / or air conditioning device furthermore comprises a separating element 62 making it possible to separate the flow of air coming from the first heat exchanger 4 by two separate air flows, each being intended to be oriented towards a distinct part of the second heat exchanger 6. The separating element 62 as illustrated in FIG. 2, corresponds to a set of interconnected walls, thus forming a hollow polygon. However, a single wall is sufficient to fulfill this function.

The separating element 62 comprises reception means able to accommodate the first and second flaps 38,40. These receiving means correspond here to a wall having a recess in which the sliding door 42 of the first flap 38 is adapted to cooperate with and a flat wall against which the sliding plate 50 of the second flap 40 can come to bear. Of course, it is possible to consider other reception means such as a stop molded on a flat wall for example.

The separating element 62 separates the air flow coming from the first heat exchanger 4 into two air streams. Each air flow has the possibility of crossing a part of the second heat exchanger 6 and / or a bypass path 34, 36 in the appropriate proportions to guarantee the respective setpoint temperatures. The separating element 62 may correspond to a part of the fixed deflector 64, or it may be secured to the latter. FIGS. 7A to 7C illustrate different modes of operation of the device 1 according to the invention. Specifically Figure 7A illustrates the 100% defrost mode, Figure 7B illustrates the 100% feet mode, and Figure 7C illustrates the 100% ventilation mode.

In the operating mode illustrated in FIG. 7A, the duct 14 leading the flow of air towards the ventilation nozzles, or central vents, and the duct 16 directing the flow of air towards the foot nozzle are closed, the flow of air air passing inevitably through the conduit 12 to the defrosting nozzle. In the operating mode illustrated in FIG. 7B, the duct 14 leading the flow of air towards the ventilation nozzles and the duct 12 directing the flow of air towards the defrosting nozzle are closed, the airflow thus passing through. through the conduit 16 to the foot nozzle. In the operating mode illustrated in FIG. 7C, the duct 16 leading the flow of air towards the nozzles of the feet and the duct 12 directing the flow of air towards the deicing nozzle are closed, the air flow thus passing through line 14 to the ventilation nozzles, or central vents. The device 1 for heating, ventilation and / or air conditioning includes regulating means for obstructing or allowing the flow of air through the ducts leading the air flow to the appropriate outlets. These means of regulation comprise a first sliding shutter 72 and a second sliding shutter 74 able to seal the three ducts, each shutter being able to close two ducts. Each sliding shutter 72 and 74 moves between two extreme positions which will be described below.

The first sliding shutter 72 translates between two positions, a first extreme position where it completely closes the duct 14 leading the flow of air towards the ventilation nozzles, or central vents as illustrated in FIG. 7A, and a second extreme position where it closes. integrally the duct 12 directing the flow of air to the defrosting nozzle as shown in Figure 7B. The second sliding shutter 74 also translates between two positions, a first extreme position where it completely closes the duct 16 leading the flow of air towards the foot nozzles as shown in FIG. 7A, and a second extreme position where it completely closes the duct. 12 directing the airflow to the defrosting nozzle as shown in Figure 7B. It is therefore understood that when the two sliding shutters 72,74 are in the extreme position called overlap where they simultaneously close a single duct 12, the two sliding shutters 72,74 overlap at least partially, or they can overlap completely in said extreme position of recovery. Of course, the sliding shutters 72,74 are able to adopt any intermediate position so as to let air into any desired conduit in the appropriate proportions.

FIG. 8 illustrates a partial view of the heating, ventilation and / or air conditioning device 1 according to the invention, and in particular the set of sliding shutters 72, 74.

Each sliding shutter comprises a sliding door 76, 78 on which is arranged a rack and at least one gear 80 cooperating with said rack. In order to have a uniform and regular movement of the sliding doors 76, 78, each door 76, 78 is in the form of a flat rectangular plate and which comprises two racks arranged at the opposite ends of the plate. Each rack cooperates with a gear 80, which results in a regulating means comprising a sliding door 76, 78 and two gears 80.

The first sliding shutter 72 thus comprises two gears 80 whose centers, corresponding to the axes of rotation, are interconnected by a link here in the form of a hollow cylindrical tube 84, an unrepresented actuator inducing the rotation of one of the 80. Such a system thus allows the transmission of the movement induced by the actuator of a gear 80 to the other, thus ensuring a better translation of the sliding door 76. The second sliding shutter 74 also comprises two gears 80 whose centers are interconnected by a link, here in the form of a rod 82 of metal or of rigid plastic, a not shown actuator inducing the rotation of one of the gears 80. The rod 82 corresponds to a thin rod of rectangular section and more particularly square. Thus, it is ensured that the axis of rotation does not interfere with the flow of the airflow through the minimum section of the rod 82. It should also be emphasized that the gears 80 of the first and second sliding flaps 72, 74 are connected by links of different shape, one being a rod 82 of square section and the other being a cylindrical tube 84 of circular section. As illustrated in FIG. 2, so as not to hinder the flow of the air flow, it is also possible to introduce a compartment 86 into the housing 2 between two ducts 12, 16 so as to arrange the connection therebetween. , 84 between the gears 80. Thus, the rod or the hollow cylinder is no longer in the flow channel 3 of the air flow thus reducing the pressure drops. By compartment is meant a portion of the housing 2 which has been divided by partitions, or in other words an internal cell at least partially or entirely partitioned.

As previously described, each sliding shutter 72, 74 comprises a sliding door 76, 78 on which is arranged two racks each cooperating with a gear 80. According to the invention, said gears 80 of the first sliding shutter 72 are situated on the one hand by the sliding door 76, for example located an upstream relative to the flow of the air flow, while the gears 80 of the second sliding shutter 74 are located on the other side of the sliding door 78, in other words downstream by relative to the flow of the air flow. In other words, the gears 80 of the first and second sliding shutters 72, 74 are located on either side of the sliding doors 76, 78.

As illustrated in FIG. 7C, the entries of the conduits 12, 14, 16 are written in the same plane S, or in other words, the said inputs are coplanar. In order to gain height, the sliding shutters 72, 74 should be inscribed in planes substantially parallel to the plane S of the entries of the ducts 12, 14, 16. Similarly, in order to have a device 1 for heating, ventilation and / or air conditioning of optimum height, the plane S of said duct entries 12,14,16 is parallel to the plane R in which is inscribed the second heat exchanger 6 Of course, the sliding doors 76, 78 move in a plane substantially parallel to the plane R of said heat exchanger.

It should be understood, however, that these exemplary embodiments are given by way of illustration of the object of the invention. The invention is not limited to these embodiments described above and provided solely by way of example. It encompasses various modifications, alternative forms and other variants that may be considered by those skilled in the art within the scope of the present invention and in particular any combination of the various embodiments described above.

Claims

claims

Device (2) for heating, ventilation and / or air conditioning for a motor vehicle comprising a first sliding shutter (72) and a second sliding shutter (74) capable of closing off at least three ducts (12, 14, 16), characterized in that the two sliding flaps (72, 74) overlap at least partially in an extreme so-called overlap position, each sliding flap (72, 74) being able to completely close off two ducts (12, 14, 16).

Device (2) for heating, ventilation and / or air conditioning according to claim 1, wherein in said extreme covering position, the first and second sliding shutters (72, 74) simultaneously seal a single duct (12, 14, 16). .

Device (2) for heating, ventilation and / or air conditioning according to one of claims 1 or 2, wherein the first and second sliding shutters (72,74) overlap integrally in said extreme position of recovery.

Device (2) for heating, ventilation and / or air conditioning according to one of claims 1 to 3, wherein at least one of said sliding shutters (72,74) comprises a first and a second gear (80), said gears (80 ) being interconnected by a rod (82,84).

Device (2) for heating, ventilation and / or air conditioning according to claim 4, wherein the rod (82) is metallic and of rectangular section.

Device (2) for heating, ventilation and / or air conditioning according to one of claims 1 to 5, wherein each sliding flap (72,74) comprises a sliding door (76,78) on which is arranged at least one cooperating rack with a gear (80), said gears (80) being located on either side of the sliding doors (76, 78).

Device (2) for heating, ventilation and / or air conditioning according to one of claims 1 to 5, wherein the entries of the ducts (12,14,16) are written in the same plane (S).

8. Device (2) for heating, ventilation and / or air conditioning according to one of claims 6 to 7, wherein the sliding doors (76,78) move in a plane parallel to the plane (S) of the duct entries ( 12,14,16). 9. Device (2) for heating, ventilation and / or air conditioning according to one of claims 6 to 8, wherein is included a heat exchanger inscribed in a plane (R), the sliding doors (76,78) moving in a plane parallel to the plane (R) of said heat exchanger and parallel to the plane (S) of the duct inlets (12, 14, 16).