Air extractor of a ventilation system.

Abstract

Title of the invention: Air extractor for a ventilation device. The present invention relates to a vehicle ventilation device (2) comprising at least one housing (4) defining an airflow channel between an air inlet through which the airflow is intended to enter the housing (4) and an air outlet through which the airflow is intended to exit the housing (4). The ventilation device (2) comprises a propeller configured to force the airflow through the circulation channel between at least the air inlet and the air outlet. The ventilation device (2) comprises an air extractor (16) separate from the housing (4) and attached to the housing (4) at the air outlet. (Figure 4)

Description

Title of the invention: Air extractor for a ventilation device.

[0001] The present invention relates to the field of ventilation systems fitted to a vehicle. More particularly, the present invention relates to the management of the airflow exiting such a ventilation system.

[0002] Vehicles, and in particular motor vehicles, are conventionally equipped with ventilation devices, which have the function of regulating the temperature of an airflow intended to be sent into the passenger compartment or onto vehicle components to be heated or cooled, and / or the function of regulating the temperature of a heat transfer fluid intended to circulate in heat exchangers of vehicle thermal regulation systems.

[0003] It is known to equip these ventilation devices with a motor-fan unit that circulates an airflow within a dedicated duct. The airflow is used, for example, to perform a heat exchange with a heat exchanger positioned in the duct and forming part of a control system, such as a heating, ventilation, and / or air conditioning system. More specifically, ventilation devices and their associated motor-fan units are known to be located in a front compartment of the vehicle to facilitate the recovery of fresh air while the vehicle is in motion. Fresh air enters the duct of the ventilation device and exits, towards the rear of the vehicle, charged with heat or cold, depending on the application, propelled by the fan.

[0004] Within this front compartment of the vehicle, on many vehicles there is a powertrain that helps to drive the vehicle in motion, but also many components of one or more thermal regulation systems.

[0005] In this context, the airflow is directed from the ventilation system and its associated fan assembly towards the powertrain and / or components of a thermal management system. This airflow into the front compartment necessitates protecting the various components of the thermal management system so that their temperature can be controlled and this airflow does not affect the thermal management of the powertrain and / or other vehicle components. It is understood that these additional insulation methods are costly, time-consuming to install, and bulky.

[0006] The present invention falls within this context and aims to overcome at least some of the aforementioned drawbacks by limiting the impact of the airflow exiting the ventilation device on the elements located in the front compartment.

[0007] Thus, the present invention relates to a vehicle ventilation device comprising at least one housing participating in delimiting a circulation channel for an airflow between an air inlet through which the airflow is intended to enter the housing and an air outlet through which the airflow is intended to exit the housing, the ventilation device comprising a motor-fan unit having a propeller configured to force the passage of the airflow through the circulation channel between at least the air inlet and the air outlet, the ventilation device comprising an air extractor separate from the housing and attached to the housing at the air outlet.

[0008] The housing forms an enclosure that accommodates a plurality of components involved in the operation of the ventilation system. Within this housing, a circulation channel is formed between an air inlet and an air outlet to allow an airflow to circulate through the ventilation system. The circulation of the airflow within the channel is forced by means of a fan of the motor-fan assembly, driven in rotation by a drive motor. The drive motor may, in particular, be housed inside the housing. The fan is activated when air needs to pass through the ventilation system with the vehicle stationary and / or when the vehicle's speed does not allow for a sufficient quantity of fresh air to achieve the desired heat exchange within the ventilation system.

[0009] The ventilation device includes at least one heat exchanger for exchanging heat with the airflow. To this end, the heat exchanger is positioned across the circulation duct such that the airflow passing through the duct is in contact with the heat exchanger. The heat exchanger may, in particular, be supplied by a heat transfer fluid circulating within a loop and exchanging heat with the airflow through walls of the heat exchanger defining a circulation duct for the heat transfer fluid, or it may be an electric heater, without these examples being limiting to the invention.

[0010] As a result of this arrangement, the air exiting the ventilation device has a different temperature than the air entering the ventilation device housing, due to its passage through the heat exchanger. This air is intended to be propelled downstream of the ventilation device housing by the fan. To prevent this air temperature differential from negatively impacting the thermal functions of components located downstream of the ventilation device housing and the heat exchangers, considering the airflow path, the invention provides for a specific air extractor at the outlet of the ventilation device housing.

[0011] The air extractor is fixed to the housing in such a way that all the airflow exiting the housing through the air outlet passes through this air extractor. The housing has a single air outlet. Thus, all the airflow passing through the channel Air circulates through the air extractor. The air extractor collects the airflow exiting the case through the air outlet and directs it to areas of interest.

[0012] The extractor is an added component of the ventilation system and is attached to the housing. It is understood that the housing does not directly form the air extractor. This feature allows the air extractor to be shaped according to the desired technical characteristics without being dependent on the architecture of the housing which contains, among other things, the heat exchanger and the fan.

[0013] The extractor is configured to guide the propelled air out of the ventilation device housing. Its shape takes into account this positioning and the fact that the airflow passing through it propagates at high speed due to the action of the propeller.

[0014] According to an optional feature of the invention, the air extractor is made of a thermoplastic material. This air extractor can be made of a material distinct from that used to make the housing of the ventilation device, advantageously in a material limiting thermal conduction to ensure that the temperature differential of the air exiting the housing of the ventilation device compared to the fresh air entering this housing does not impair the thermal functions performed by components located in the immediate vicinity of the ventilation device.

[0015] According to an optional feature of the invention, the air extractor comprises at least a first circulation duct configured to direct the airflow to a first area of ​​the vehicle and a second circulation duct configured to direct the airflow to a second area of ​​the vehicle, the first area being different from the second area.

[0016] The first and second zones, towards which the air extractor directs the airflow exiting the housing through the air outlet, comprise different elements implementing different vehicle functions. In other words, the first and second zones of the vehicle are two areas within which different functions ensuring the vehicle's operation are implemented.

[0017] It is understood that in this way the airflow is not projected indifferently in one direction when the airflow leaves the ventilation device.

[0018] According to an optional feature of the invention, the air extractor is configured to direct the airflow in at least two distinct directions. The first circulation duct and the second circulation duct each extend in intersecting principal elongation directions. These different principal elongation directions for the first and second circulation ducts allow the airflow exiting the ventilation device to be directed in different directions and thus onto distinct areas of interest.

[0019] According to an optional feature of the invention, the second circulation duct extends from the first circulation duct. It is understood that the second circulation duct originates from the first circulation duct. In other words, the airflow circulating in the second circulation duct first passes through a portion of the first circulation duct.

[0020] According to an optional feature of the invention, the cross-sectional area of ​​the first circulation duct is larger than the cross-sectional area of ​​the second circulation duct. By adjusting the cross-sectional area of ​​the first and second circulation ducts, it is possible to define the volume of air, for a given airflow rate, circulating through the first and second circulation ducts. By generating a larger cross-sectional area in the first circulation duct than in the second, the airflow is favored through the first circulation duct, and the air is expelled from the area of ​​interest opposite the free end of this first circulation duct.

[0021] As previously stated, the air extractor is configured to guide the air propelled from the ventilation device housing. Providing a first circulation duct with a larger cross-section allows a large quantity of air to be exhausted in line with the housing, so as not to impede the supply of fresh air to this housing and not to compromise the heat exchange functions performed in the ventilation device according to the invention. The air extractor thus has a main air exhaust channel, whose primary function is to allow air to be exhausted and not to impair the thermal function of the ventilation device. This channel is oriented to exhaust the air into an area where this air will not be detrimental to other components and may, on the contrary, be beneficial, for example, from an aerodynamic standpoint.Providing a second circulation duct and starting it from the first circulation duct allows for at least one secondary channel which makes it possible to direct a portion of the airflow to a second area of ​​interest without hindering the extraction of air from the housing, by drawing in forced air from within the main channel.

[0022] According to an optional feature of the invention, the second circulation conduit has a circular cross-section.

[0023] According to an optional feature of the invention, the air extractor is configured to allow laminar flow of the air stream within the first circulation duct and the second circulation duct.

[0024] The shape of the air extractor, particularly at the level of the first and second circulation ducts, allows for laminar airflow. This laminar airflow maximizes the volume air can circulate through the air extractor compared to an air extractor where turbulence is generated. Thus, the air extractor, with its smaller dimensions, allows for greater air circulation and therefore optimizes the amount of air available for heat exchange with the heat exchanger, compared to an air extractor where the airflow is subject to turbulence.

[0025] According to an optional feature of the invention, the air outlet forms an opening in the housing where the propeller is located, the opening being at least partially delimited by a peripheral edge, the air extractor being attached to the housing at the peripheral edge. Attaching the air extractor to the housing via the peripheral edge makes it possible to limit the size of the ventilation device by adjusting the size of the air extractor to the size of the air outlet, while ensuring that all the airflow exiting the housing through the opening passes through the air extractor.

[0026] According to an optional feature of the invention, the air extractor includes an air inlet portion secured at least to the peripheral edge by a fastening means.

[0027] According to an optional feature of the invention, a first part of the air extractor is attached to the peripheral edge and a second part is attached to an end edge of the housing. The opening is formed on one face of the housing. This face of the housing is delimited by end edges extending along the perimeter of said face of the housing. The air extractor is attached by a first part to the peripheral edge and by a second part to an end forming an end edge of said face of the housing. It should be noted that the end of the housing to which the second part is attached is distinct from the peripheral edge delimiting the air outlet opening.

[0028] According to an optional feature of the invention, the first circulation duct is a main air outlet path and the second circulation duct is a secondary air outlet path, the main air outlet path being provided opposite the propeller.

[0029] According to an optional feature of the invention, the ventilation device includes a heat exchanger intended to perform a heat exchange with the airflow, the propeller being interposed between the heat exchanger and the air extractor.

[0030] The invention also relates to a front compartment of a vehicle comprising a ventilation device.

[0031] According to an optional feature of the invention, the front compartment includes a powertrain and / or at least one component of a thermal regulation system arranged directly opposite the ventilation device, the air extractor being configured to divert the airflow from the powertrain and / or at least one component of the thermal control system.

[0032] The components of a thermal control system are components that require protection from the airflow projected from the ventilation device. The architecture of the front compartment results in a close proximity between these components and the ventilation device. The air extractor diverts the airflow away from these components, thus limiting the need for additional insulation to protect them and ensure that their thermal function is not affected by a projection of hot or cold air. In other words, in the front compartment according to the invention, components of a thermal control system directly facing a ventilation device are not specifically thermally insulated, as the airflow is diverted by the air extractor interposed between the fan assembly's impeller and the ventilation device's air outlet on the one hand, and these components on the other.

[0033] According to an optional feature of the invention, the front compartment is at least partly delimited by a fairing element of the vehicle, the bodywork element includes openings arranged directly opposite the ventilation device, the air extractor being configured to force the circulation of the airflow through said openings.

[0034] According to an optional feature of the invention, the first circulation duct is configured to direct the airflow towards an underbody of the vehicle and the second circulation duct is configured to direct the airflow towards a braking system of the vehicle located in a wheel arch.

[0035] Other features, details and advantages of the invention will become clearer upon reading the following description on the one hand, and the illustrative and non-limiting examples of embodiments given with reference to the accompanying schematic drawings on the other hand, in which:

[0036] [Fig.1] schematically represents a general view of a ventilation device according to the invention, comprising an air extractor;

[0037] [Fig.2] schematically represents a side view of the ventilation device visible on [Fig.1] and installed in a front compartment of a vehicle, a component of a thermal regulation system being positioned directly opposite the ventilation device;

[0038] [Fig.3] schematically represents a cross-sectional view of the ventilation device installed in the front compartment visible in [Fig.2];

[0039] [Fig.4] schematically represents a perspective view of the front compartment allowing us to highlight at least two areas of interest towards which a airflow is directed by means of the air extractor of the ventilation device according to the invention.

[0040] The features, variants, and different embodiments of the invention can be combined in various ways, provided they are not incompatible or mutually exclusive. In particular, variants of the invention may be conceived comprising only a selection of features, described hereafter in isolation from the other described features, if this selection of features is sufficient to confer a technical advantage or to differentiate the invention from the prior art.

[0041] In the figures, the elements common to several figures retain the same reference.

[0042] In the detailed description that follows, the terms "longitudinal," "transverse," and "vertical" refer to the orientation of the ventilation device according to the invention. A longitudinal direction corresponds to a direction of travel of a vehicle including the ventilation device, this longitudinal direction being parallel to a longitudinal axis L of a frame of reference L, V, T illustrated in the figures. A transverse direction corresponds to a direction perpendicular, in a plane parallel to the road on which the vehicle is traveling, to the direction of travel of the vehicle including the ventilation device, this transverse direction being parallel to a transverse axis T of the frame of reference L, V, T, and this transverse axis T being perpendicular to the longitudinal axis L.Finally, a vertical direction corresponds to a direction parallel to a vertical axis V of the L, V, T frame, this vertical axis V being perpendicular to the longitudinal axis L and to the transverse axis T.

[0043] Figure 1 represents a ventilation device 2 according to the present invention. The ventilation device 2 is intended to be fitted to a vehicle and comprises a housing 4 forming an external casing of the ventilation device 2. The housing 4 delimits a compartment in which is housed at least one heat exchanger, visible in Figure 3, to perform a heat exchange between a heat transfer fluid circulating in this heat exchanger and an airflow circulating in the housing 4 of the ventilation device, and at least one impeller 5, visible here in transparency, to force the passage of the airflow through the ventilation device 2.

[0044] The housing 4 helps to delimit a circulation channel for an airflow between an air inlet, not visible here, through which the airflow is intended to enter the housing 4 and an air outlet 8 through which the airflow is intended to exit the housing 4.

[0045] The propeller 5 forces the passage of airflow through the circulation channel between the air inlet and the air outlet 8 and through the heat exchanger so that the airflow can recover heat. This heat exchanger is, in the In the embodiment shown, a radiator 6, visible in [Fig. 3], is positioned across the circulation channel such that the airflow passing through the channel passes through the radiator, exchanging heat with a heat transfer fluid circulating within it. It should be noted that the fact that the heat exchanger is traversed by a heat transfer fluid is not a limiting factor of the invention, and that this heat exchanger could be an electric heater designed to heat the airflow passing through it.

[0046] As seen in [Fig. 1], the housing 4 has a generally rectangular shape. The air inlet is located on a first face, not shown here, of the housing 4, and the air outlet 8 is located on a second face 12 opposite the first face. Each of the first and second faces 12 extends, in the embodiment shown, in a principal plane of elongation extending vertically and transversely, that is, parallel to the axes V and T. The first face, in which the air inlet is located, faces outwards from the vehicle and towards the road in front of the vehicle, while the second face faces in the opposite direction, towards the passenger compartment of the vehicle.

[0047] The air outlet 8 is formed by an opening 14 made on the second face 12. The opening 14 has a circular cross-section. This circular cross-section of the opening 14 is advantageously complementary to the shape of the propeller 5 so that the radial ends of the propeller 5, i.e. the ends of the blades 10 of the propeller 5 visible in [Fig. 3], are as close as possible to a peripheral edge 18 delimiting the opening 14. The propeller 5 is free to rotate about a hub, the end of a blade 10 located near the peripheral edge 18 being the distal end of this blade 10 opposite the hub.

[0048] The peripheral edge 18 delimits the opening 14 while also forming a projection of the second face 12 of the housing 4, towards the outside of the housing 4. In other words, the peripheral edge 18 is here an annular edge which extends axially substantially perpendicularly to the plane in which the second face 12 is inscribed.

[0049] The ventilation device 2 includes an air extractor 16 attached to the housing 4 at the level of the second face 12. The air extractor 16 is attached on at least part of the peripheral edge 18 so that the entire airflow exiting the housing 4 through the opening 14 passes through the air extractor 16.

[0050] The air extractor 16 is an added part, made independently of the housing, and fixed to the latter at the peripheral edge 18 by means of a fastening means 19. This fastening means 19 can take a plurality of forms such as clips formed by a plurality of elastically deformable fingers attached to the air extractor 16 which fit into notches provided in the peripheral edge 18. Alternatively, the air extractor 16 can be screwed or welded to the edge peripheral 18 or be overmolded onto the peripheral edge 18, if necessary before the assembly of the ventilation device 2.

[0051] More specifically, the air extractor 16 includes an air inlet portion 20 disposed directly opposite the air outlet 8 of the housing 4. It should be noted that "directly opposite" means that the air inlet portion 20 is opposite the air outlet 8 and that no element is interposed between the air outlet 8 of the housing 4 and the air inlet portion 20 of the air extractor 16. This air inlet portion 20 forms the portion of the air extractor 16 through which the airflow exiting the housing 4 is able to enter the air extractor 16. The air inlet portion 20 is fixed to the peripheral edge 18 such that the air inlet portion 20 is fixed to at least 50% of the peripheral edge 18. It should be noted that This value of 50% corresponds to 50% of the perimeter of the opening 14 formed by the peripheral edge 18.In the embodiment shown, this value of 50% corresponds to an angular distance of 180° measured from the hub of the propeller 5.

[0052] Furthermore, the air extractor 16 includes a first circulation duct 24 through which the entire airflow exiting the housing 4 via the air outlet 8 passes, and at least a second circulation duct 26. The first circulation duct 24 forms the duct through which the airflow is able to exit the air extractor 16 to a first area of ​​interest. The second circulation duct 26 extends from the first circulation duct 24 to a second area of ​​interest distinct from the first area.

[0053] Figures 2 and 3 illustrate respectively a side view of the ventilation device 2 visible in [Fig. 1] and a cross-sectional view of said ventilation device 2. In these figures 2 and 3, the ventilation device 2 is installed in a front compartment 28 of a vehicle.

[0054] As can be seen in Figures 2 and 3, the front compartment 28 includes at least one powertrain 30 intended to help set the vehicle in motion and at least one component of a thermal control system 32. The component of the thermal control system 32, which may be, by way of example and without limiting the invention, an electric heater attached to the powertrain, is arranged directly opposite the air extractor 16, that is to say, no element is interposed between the component of the thermal control system 32 and the air extractor 16.

[0055] It is noticeable in Figures 2 and 3 that the air extractor 16 is secured, as described above, to the peripheral edge 18. More specifically, the air inlet portion 20 of the air extractor 16 comprises at least a first part 34 and a second part 36. The first part 34 and the second part 36 form edges of the air inlet portion 20 of the air extractor 16 which help to delimit the first circulation duct 26.

[0056] The first part 34 is attached to the peripheral edge 18. For this purpose, the first part 34 has an annular shape configured to fit the peripheral edge 18 and is attached to it by means of the fastening means 19. The second part 36 is attached to an end of the housing 4 distinct from the peripheral edge 18. This end of the housing 4 may in particular be formed by the lower end edge of the housing, which, in the embodiment shown, extends parallel to the axis T. Similar to the first part 34, the second part 36 is attached to the housing 4 by a fastening means as described above.Without leaving the context of the invention, and as can be suggested by the representations in Figures 1 and 4, it may be envisaged that the entire inlet portion 20, and therefore each of its parts, is fixed on the peripheral edge, the inlet portion having a shape complementary to that of the peripheral edge 18 arranged around the helix 5.

[0057] The first circulation duct 24 extends from the air inlet portion 20 to a passage 38 which forms an end of the first circulation duct 24 through which the airflow is able to exit the air extractor 16. This passage 38 has dimensions enabling the first circulation duct 24 to be the main air outlet of the air extractor 16.

[0058] Opposite the air inlet portion 20, the air extractor 16 includes a bottom wall 40. This bottom wall 40 helps to delimit the first circulation duct 24 and prevents the airflow entering through the air inlet portion 20 from being directed indiscriminately into the entire front compartment 28. This feature of the bottom wall 40 allows the component of a thermal regulation system 32 to be positioned opposite and near the air outlet 8 of the housing 4 without requiring specific insulation. Indeed, the airflow is, via the air extractor 16 and the presence of this bottom wall 40 in particular, diverted towards the first and second zones. Thus, the component of a thermal regulation system 32 is not located in the airflow and does not exchange heat with it.It should be noted that in the figures only one component of a thermal regulation system 32 is shown for simplicity. Of course, a plurality of components of a thermal regulation system 32 can be arranged opposite and near the air outlet 8 of the housing 4 without requiring any special insulation, provided they are protected by the back wall 40 of the air extractor 16.

[0059] Figure 4 shows a general view of the front compartment 28 including the ventilation device 2. As seen in Figure 4, the front compartment 28 includes a cradle 42 and a fairing element 44 intended to form the front compartment element 28 closest to the road. The fairing element 44 includes a plurality of openings 46 passing through the bodywork element 44.

[0060] These orifices 46 are advantageously arranged opposite the air extractor 16 and more specifically the passage 38, visible in transparency on the [Fig.1], of the first circulation duct 24. The orifices 46 thus allow the airflow exiting the air extractor 16 through the first circulation duct 24, that is to say, as a reminder, the main air outlet path of the air extractor 16, to exit the front compartment 28 to reach the first area of ​​interest located under the vehicle.

[0061] More specifically, the propeller 5, the first circulation duct 24, the passage 38, and the orifices 46 are substantially aligned so that a maximum amount of air can be rapidly evacuated from the front compartment 28 to the first area located under the vehicle. It is understood that the airflow is thus directed to pass under the front compartment 28, creating an air gap beneath the vehicle and thereby improving the vehicle's aerodynamics.

[0062] It is noteworthy that the air extractor 16 in the embodiment shown includes a third circulation duct 48 which, like the second circulation duct 26, extends from the first circulation duct 24. The second circulation duct 26 and the third circulation duct 48 each form a secondary air outlet. In the embodiment shown, the second circulation duct 24 and the third circulation duct 48 each allow the airflow to be directed towards a wheel arch 50 of the vehicle constituting the second area of ​​interest. The airflow directed towards the wheel arch 50 is used, by way of illustrative and non-limiting example of the invention, to help cool a braking system of the vehicle.

[0063] The description that will be given in connection with the second circulation duct 26 applies mutatis mutandis to the third circulation duct 48. The second circulation duct 26 has, in the embodiment shown, a circular cross-section. The dimensions of the circular cross-section of the second circulation duct 26 are smaller than the dimensions of the passage 38 and, more broadly, of the first circulation duct 24. This characteristic makes the first circulation duct 24 the main air outlet of the air extractor 16.

[0064] The second circulation duct 26 extends from the first circulation duct 24 to the wheel arch 50 without the airflow coming into contact with the interior environment of the front compartment 28. Thus, the component of a thermal regulation system 32 is not in contact with the airflow even when the latter circulates through the second circulation duct 26.

[0065] Furthermore, the air extractor 16 is advantageously configured so that the airflow passing through the air extractor 16 is laminar. This characteristic of the air extractor 16 makes it possible to circulate the maximum amount of air possible at any given time through the air extractor 16 and thus optimize the quantity of air that can circulate through the ventilation device 2.

[0066] The present invention achieves its objective by proposing a ventilation device comprising an air extractor that diverts the airflow away from components located in the front compartment of the vehicle. This air extractor thus limits unwanted heat exchange within the front compartment and therefore reduces the need for thermal insulation within the front compartment.

[0067] The present invention is not limited to the means and configurations described and illustrated herein and also extends to any equivalent means and configuration as well as to any technically operative combination of such means.

Claims

Demands

1. A ventilation device (2) for a vehicle comprising at least one housing (4) participating in defining a circulation channel for an airflow between an air inlet through which the airflow is intended to enter the housing (4) and an air outlet (8) through which the airflow is intended to exit the housing (4), the ventilation device (2) comprising a propeller (5) configured to force the passage of the airflow through the circulation channel between at least the air inlet and the air outlet (8), the housing (4) containing a heat exchanger and the propeller (5), the heat exchanger being intended to perform heat exchange with the airflow, the heat exchanger being disposed across the circulation channel such that the airflow passing through the circulation channel is in contact with the heat exchanger,the ventilation device (2) comprising an air extractor (16) separate from the housing (4) and attached to the housing (4) at the air outlet (8).

2. Ventilation device (2) according to the preceding claim, wherein the air extractor (16) comprises at least a first circulation duct (24) configured to direct the airflow to a first area of ​​the vehicle and a second circulation duct (26) configured to direct the airflow to a second area of ​​the vehicle, the first area being different from the second area.

3. Ventilation device (2) according to the preceding claim, wherein the second circulation duct (26) extends from the first circulation duct (24).

4. Ventilation device (2) according to any one of claims 2 and 3, wherein the air passage cross-section of the first circulation duct (24) is greater than the air passage cross-section of the second circulation duct (26).

5. Ventilation device (2) according to any one of the preceding claims, wherein the air outlet (8) forms an opening (14) in the housing (4) at the level of which the propeller (5) is housed, the opening (14) being at least partly delimited by a peripheral edge (18), the air extractor (16) being attached to the housing (4) at the level of the peripheral edge (18).

6. Ventilation device (2) according to the preceding claim, wherein the air extractor (16) comprises an air inlet portion (20) secured at least to the peripheral edge (18) by a means of fastening (19).

7. Front compartment (28) of a vehicle comprising a ventilation device (2) according to any one of the preceding claims.

8. Front compartment (28) according to the preceding claim, the front compartment (28) comprising a powertrain (30) and / or at least one component of a thermal control system (32) disposed directly opposite the ventilation device (2), the air extractor (16) being configured to deflect the airflow from the powertrain (30) and / or at least one component of the thermal control system (32).

9. Front compartment (28) according to any one of claims 7 and 8, the front compartment (28) being at least partially delimited by a body element (44) of the vehicle, the body element (44) comprising openings (46) disposed directly opposite the ventilation device (2), the air extractor (16) being configured to force the circulation of the airflow through said openings (46).

10. Front compartment (28) according to any one of claims 7 to 9 in combination with claim 2, wherein the first circulation duct (24) is configured to direct the airflow towards an underbody of the vehicle and the second circulation duct (26) is configured to direct the airflow towards a braking system of the vehicle located in a wheel arch (50).

Images