Ventilation device for a motor vehicle comprising an air recycling module

Abstract

Ventilation device for a motor vehicle comprising an air recycling module The invention relates to a ventilation device (1) for a motor vehicle, comprising a housing (2) comprising an injection opening (5) configured to be fluidically connected to an outside air inlet duct (6), the ventilation device further comprising a recycling module (10) configured to selectively allow the injection of interior air or outside air into the ventilation device, respectively through recycling openings of the housing and through the injection opening. Figure for abstract: Fig. 1

Description

Title of the invention: Ventilation device for a motor vehicle comprising an air recycling module Technical field

[0001] The present invention relates to the field of ventilation devices, in particular for motor vehicles.

[0002] The motor vehicle may be a vehicle of category L6, L7 or Ml according to the European Union vehicle classification and may have a thermal or electric engine. In particular, it may be a quadricycle type vehicle.

[0003] The invention also relates to a motor vehicle comprising such a ventilation device. Prior art

[0004] A motor vehicle generally comprises a ventilation device, in particular a heating, ventilation and air conditioning device (HVAC device), also known as an HVAC device (acronym for the English expression "Heating, ventilation, and Air-Conditioning").

[0005] An HVAC device includes functions for ventilating, heating and cooling a vehicle interior improving occupant comfort.

[0006] HVAC devices are generally equipped with an air recycling module arranged upstream of the heating and cooling units, or even upstream of the ventilation unit which notably includes a motor also called a blower.

[0007] The recycling module makes it possible to modulate the quantity of air entering the HVAC device between the air coming from outside the vehicle and the interior air, i.e. the air coming from the passenger compartment of the vehicle. In the absence of a recycling module, only exterior air is injected into the HVAC device. The recycling module thus makes it possible to choose between an injection of only exterior air, an injection of only interior air or an injection of a mixture of exterior air and interior air.

[0008] Recycling indoor air makes it possible in particular to limit the energy consumption of the HVAC system, the indoor air having already been heated or cooled.

[0009] A recycling module typically includes an opening leading to the passenger compartment and which can be selectively opened or closed. This makes it possible to selectively inject interior air into the ventilation device or not.

[0010] A recycling module generally has a significant impact on the dimensions and architecture of a ventilation device. In addition, the switching device which allows switching between an interior air passage configuration and a configuration of outside air passage, which can be a mechanical and / or electrical device, is often complex and difficult to access.

[0011] However, quadricycle type vehicles, particularly of categories L6 or L7, have particular constraints in terms of available volumes and / or energy consumption.

[0012] Thus, in these vehicles, the ventilation devices are generally of reduced dimensions compared to those of heavier vehicles. Their main function is to ventilate the passenger compartment and may or may not have a heating and / or cooling function. They typically do not include an air recycling module.

[0013] The possibility of recycling the air in the passenger compartment is particularly important for an electric quadricycle vehicle, because heating or cooling the air is energy-intensive and the available energy is limited.

[0014] Applications EP 2711216 A2, FR 3082785 Al, FR 3044604 Al, FR 2683188 Al, WO 2021 055758 Al, WO 2019 155135 Al disclose air intake or air recycling management solutions. All these solutions are nevertheless of complex design.

[0015] There is therefore a need to propose a ventilation device having a simplified design, in particular for implementation in a quadricycle type vehicle.

[0016] The aim of the invention is to meet at least part of this need. Summary of the invention

[0017] To this end, the invention relates in one of its aspects to a ventilation device for a motor vehicle, comprising a housing having an injection opening configured to be fluidically connected to an outside air inlet duct, the ventilation device further comprising a recycling module configured to selectively allow the injection of inside air or outside air into the ventilation device,

[0018] the recycling module comprising a rotating crown and a diaphragm mounted on the crown such that rotation of the crown controls the opening or closing of the diaphragm, the recycling module being arranged in the housing such that the diaphragm thereby opens or closes the injection opening,

[0019] the crown comprising a plurality of through openings on a surface of its periphery and the housing comprising a plurality of recycling openings configured so that the through openings of the crown are arranged opposite the recycling openings of the housing when the crown is in a diaphragm closing position and that the through openings of the crown are arranged opposite solid parts of the housing when the crown is in a diaphragm opening position, so as to respectively form an interior air passage configuration in which the injection opening is closed and the recycling openings are open, and an exterior air passage configuration in which the injection opening is open and the recycling openings are closed.

[0020] The recycling module thus makes it possible to selectively inject interior air from the passenger compartment, exterior air from the duct or a mixture of interior air and exterior air in any proportion. The interior air circulates through the recycling openings and the exterior air circulates through the injection opening.

[0021] Any intermediate configuration between the interior air passage configuration and the exterior air passage configuration is possible, the recycling openings and the injection opening being able to be partially closed.

[0022] The surface of the periphery of the crown preferably forms a cylindrical part of the crown.

[0023] Preferably, the internal diameter of the crown is substantially equal to the diameter of the injection opening, the latter being of circular section.

[0024] The recycling openings and the through openings of the crown may be rectangular in shape, preferably of the same dimensions.

[0025] The diaphragm is preferably disposed between the injection opening and the crown, being preferably fixed to the crown and to a side face of the housing which comprises the injection opening, the side face preferably extending in a plane perpendicular to the axis of rotation of the crown. The diaphragm advantageously holds the crown on the housing.

[0026] According to an advantageous characteristic, the diaphragm comprises a plurality of fins each fixed to the crown by a first rivet forming a sliding pivot connection, that is to say a pivot connection which can slide in a respective sliding opening of an annular face of the crown and each fixed to the housing by a second rivet fixed on the housing, preferably on a lateral face of the housing parallel to the annular face, forming a pivot connection, so that the rotation of the crown relative to the housing causes the displacement of the fins and thus the opening or closing of the diaphragm.

[0027] The annular face extends in a plane perpendicular to the axis of rotation of the crown.

[0028] The rivets are mounted so as to allow the rotation of the fins and the sliding of the first rivets in the sliding openings. They are therefore not tightened so as to block these movements.

[0029] According to another advantageous characteristic, the rotation of the crown is controlled by a rocking device comprising a tab secured to the crown, a rod extending in a plane perpendicular to the axis of rotation of the crown and connected by one of its ends to the tab by a pivot connection and at the other of its ends to the periphery of a pivot element which can pivot about an axis parallel to the axis of rotation of the crown, so that the pivoting of the pivot element causes a translation of the tab and thus the rotation of the crown.

[0030] The rotation of the pivot element can be controlled by a wire connected to the latter. The translation of this wire can be controlled manually by a user or in an automated manner.

[0031] Preferably, the crown comprises a central cone disposed in the center of the crown.

[0032] The central cone may have an aerodynamic shape to facilitate the flow of outside air through the injection opening and the crown. In particular, the central cone may be frustoconical in shape and may be arranged in the center of the crown, i.e. along the axis of rotation of the crown.

[0033] Advantageously, the fins have a main body and an interior profile shaped to match the shape of the central cone in the interior air passage configuration in which the fins are in contact with the central cone via the interior profile.

[0034] Preferably, the inner profile of the fins is made of a less rigid material than the material of the main body of the fins. The entire profile of the fins may be made of a less rigid material than the material of the main body of the fins.

[0035] This makes it possible to further improve the sealing of the diaphragm in the interior air passage configuration.

[0036] In the absence of a central cone, the fins are preferably sized to completely close the injection opening.

[0037] According to a preferred characteristic, the sum of the unobstructed surface of the recycling openings and the unobstructed surface of the injection opening being constant whatever the degree of rotation of the crown.

[0038] This makes it possible to maintain an essentially constant air flow rate in the ventilation device, regardless of the configuration of the recycling module. In particular, the number of recycling openings and their surface area is chosen so as to meet this criterion. Preferably, the free surface area for the injection of indoor air and outdoor air is sufficiently large to minimize the noise generated by the air flow.

[0039] Advantageously, the crown is rotatable over an angle of between 18° and 25°, preferably equal to 23°. In other words, the rotational position of the crown between the interior air passage configuration and the air passage configuration exterior differs from this angle by between 18° and 25°. The elements of the recycling module and the recycling openings of the housing are sized accordingly.

[0040] Thus, a short translational movement of the lug causes a limited amplitude rotation of the crown, but a significant rotation of the fins.

[0041] The recycling module is advantageously made of plastic, in particular composite, and manufactured by injection or blowing.

[0042] Advantageously, the ventilation device according to the invention is of simple and compact design: it uses a limited number of parts. In addition, the integration of the recycling module on an existing ventilation device housing is quick and easy. The volume and architecture of the ventilation device remain compact because the recycling module can be integrated into the ventilation device without significantly modifying the architecture of the latter.

[0043] Thus, the ventilation device according to the invention is particularly advantageous when implemented in a quadricycle type vehicle, by allowing the recycling of air to control the energy consumption of the vehicle while occupying a minimal volume.

[0044] The invention also relates to a motor vehicle, in particular of type L6, L7 or Ml, in particular a quadricycle, comprising a ventilation device as described above. Brief description of the drawings

[0045] [Fig.l] [Fig.l] is a perspective view of a ventilation device according to the invention.

[0046] [Fig.2] [Fig.2] is an exploded view of the recycling module of the device ventilation of [Fig.l].

[0047] [Fig.3] [Fig.3] is a detail view of a fin of the recycling module.

[0048] [Fig.4] [Fig.4] is a side view of the fin shown in [Fig.3].

[0049] [Fig.5] [Fig.5] is a perspective view of the recycling module of [Fig.2] in the outside air passage configuration.

[0050] [Fig.6] [Fig.6] is a view from another angle of the recycling module of the [Fig.5].

[0051] [Fig.7] [Fig.7] is a perspective view of the recycling module of [Fig.2] in the interior air passage configuration.

[0052] [Fig.8] [Fig.8] is a view from another angle of the recycling module of the [Fig.7].

[0053] [Fig.9] [Fig.9] is a detailed sectional view of the ventilation device of [Fig.l], the recycling module being in the configuration for passing outside air.

[0054] [Fig. 10] [Fig. 10] is a detailed sectional view of the ventilation device of [Fig.l], the recycling module being in the interior air passage configuration.

[0055] [Fig.11] [Fig.11] is a side view of the ventilation device of [Fig.l], the recycling module being in the configuration for passing outside air.

[0056] [Fig.12] [Fig.12] is a side view of the ventilation device of [Fig.l], the recycling module being in the interior air passage configuration.

[0057] [Fig. 13] [Fig. 13] is a perspective view of the ventilation device of [Fig.l], the recycling module being in the configuration for passing outside air.

[0058] [Fig. 14] [Fig. 14] is a perspective view of the ventilation device of [Fig.l], the recycling module being in the interior air passage configuration. Detailed description

[0059] [Fig.l] illustrates a ventilation device 1 according to the invention, configured to be mounted on a motor vehicle. The motor vehicle may in particular be of type L6, L7 or Ml in the vehicle classification of the European Union, preferably being an electric vehicle. The vehicle may in particular be a quadricycle.

[0060] The ventilation device 1 comprises a housing 2 which houses its components, in particular a blower configured to generate pulsed air intended to be expelled by the ventilation device 1 into the passenger compartment of the vehicle. The housing 2 is formed of two half-shells 3, 4 assembled in a sealed manner, which can in particular be held together by staples.

[0061] An injection opening 5, more particularly visible in Figures 9 and 10, allows the injection of air from outside the vehicle into the ventilation device 1. The injection opening 5, of circular section, is adapted to be fluidically connected to an air inlet duct 6, through which the outside air passes. Preferably, the injection opening 5 comprises a cylindrical section projecting towards the outside of the housing 2 on a lateral face of the latter and on which the duct 6 is mounted. The lateral face of the housing 2 may be part of a removable cover.

[0062] Air entering the ventilation device 1 is drawn towards the blower which propels the air through the device towards the outlet ports 7, which direct the air into the passenger compartment of the vehicle.

[0063] The housing 2 of the ventilation device 1 further comprises a recycling module 10, arranged in the housing in the immediate vicinity of the injection opening. The recycling module 10 is thus arranged immediately downstream of the injection opening 5.

[0064] The recycling module 10 advantageously makes it possible to reuse the air from the passenger compartment in the vehicle's ventilation system, by allowing modulation of the proportion between the recycled interior air and the exterior air. The recycled air or interior air can enter the ventilation device 1 through the recycling openings 8 of the housing 2 when these are arranged opposite corresponding through openings 23 of the crown 20 of the recycling module 10, as detailed below.

[0065] [Fig.2] shows the recycling module 10 in an exploded view.

[0066] The recycling module 10 comprises a crown 20 movable in rotation around of the central axis of the injection opening 5, a plurality of fins 30 forming a diaphragm and mounted on the crown 20 and on the housing 2, as well as a rocking device 40 which controls the rotation of the crown 20. In the embodiment shown, the recycling module 10 comprises six fins 30.

[0067] The crown 20 comprises a periphery 21 and a central part 22. The periphery 21 is of generally cylindrical shape with a diameter greater than that of the injection opening 5. A section of the periphery 21 may be of frustoconical shape, therefore of variable diameter. The periphery 21 comprises a plurality of through openings 23 distributed regularly. It also comprises a hole 24 in which a tab 41 of the rocking device 40 is housed.

[0068] The central part 22 comprises an annular face 25 with an internal diameter substantially equal to the diameter of the injection opening 5. A plurality of sliding openings 26 of elongated shape, in which first rivets 31 of the fins 30 can slide, are formed in the annular face 25. There are as many sliding openings 26 as there are fins 30. Preferably, the sliding openings 26 are distributed regularly and each extend in a radial direction from the center of the crown.

[0069] The annular face 25 may be arranged set back from the end of the periphery 21, so that the periphery 21 projects over the edge of the annular face 25.

[0070] The central part 22 also comprises a central cone 27 arranged in the center of the annular face 25 and supported by arms 28 which connect the central cone 27 to the annular face 25.

[0071] Advantageously, the central cone 27 has an aerodynamic shape, in particular a truncated cone, in order to facilitate the flow of air from the duct 6 towards the inside of the housing.

[0072] The axis of rotation of the crown 20 is advantageously coincident with the central axis of the injection opening 5.

[0073] The fins 30 are mounted on the crown 20 in a sliding manner by means of first rivets 31 inserted into the sliding openings 26. They are also mounted on the housing 2 in a fixed manner by means of second rivets 32. The fins 30 can also pivot relative to the first and second rivets. Thus, the rotation of the crown 20 relative to the housing 2 causes the fins to rotate around the second rivets 32, which are fixed, and the first rivets 31 to slide in the sliding openings 26 of the annular face 25.

[0074] As more particularly visible in Figures 3 and 4, the fins 30 have a curved banana shape, or a ring section, with a substantially constant thickness. In order to allow the fins 30 to overlap and form a diaphragm, they are not perfectly flat. In particular, the two end sections of the fins, each of which supports a rivet 31, 32, may be flat and parallel to each other, while the central section connecting these two ends may be inclined relative to the planes of the end sections in order to connect the latter.

[0075] The fins 30 are partially superimposed and are dimensioned so as to form a diaphragm, similar to an iris diaphragm. By sliding the first rivets 31 in the sliding openings 26, they can move between the configuration for passing outside air, in which they are arranged behind the annular face 25 without covering the injection opening 5, and the configuration for passing inside air, in which the diaphragm blocks the injection opening 5.

[0076] In the configuration for the passage of the internal air, the fins 30 completely cover the free surface of the internal diameter of the annular face 25. The fins 30 and the central cone 27 therefore prevent the passage of air from the conduit 6 through the injection opening 5.

[0077] Advantageously, the inner contour 33 of the fins which comes into contact with the central cone 27 is shaped to match the shape of the central cone 27 in the configuration for passing the interior air. The flow of exterior air in the ventilation device 1 is thus reduced to a minimum.

[0078] The recycling module 10 also comprises a tilting device 40 which allows the rotation of the crown 20 between the configuration for passing outside air and the configuration for passing inside air.

[0079] The rocking device 40 comprises a tab 41 inserted into the hole 24 in the periphery of the crown 20, a rod 42 connected to the tab 41 by a pivot connection and a rocker 43. The tab 41 is also inserted into an orifice 9 of the housing 2, the length of which is sufficient to allow translation of the tab 41, as more particularly visible in figures 13 and 14. The orifice 9 can be produced on a cylindrical section of a removable cover comprising the lateral face of the housing and the injection opening 5.

[0080] The rocker 43 comprises a pivot element 44 which can pivot about an axis under the action of a cable 45 attached to the pivot element 44. The free end of the rod 42 is fixed to a periphery of the pivot element 44, so that the rotation of the pivot element 44 causes the movement of the rod 42 and thus that of the tab 4L. The movement of the tab 41, inserted in the hole 24, causes the rotation of the crown 20.

[0081] Figures 5 and 6 are perspective views of the recycling module 10 in the configuration for passing outside air. Figures 7 and 8 are perspective views of the recycling module 10 in the configuration for passing inside air.

[0082] As seen in Figures 5 and 6, the recycling module 10 is configured so that the recycling openings 8 of the housing 2 are not opposite the through openings 23 of the crown 20 when the diaphragm formed by the fins 30 is open. In this configuration, the passage of the interior air through the recycling openings 8 is blocked by solid parts of the periphery of the crown 20. The exterior air from the duct 6 can circulate through the open diaphragm and enter the ventilation device.

[0083] As seen in Figures 7 and 8, the recycling module 10 is also configured so that the recycling openings 8 of the housing 2 are arranged opposite the through openings 23 of the crown 20 when the diaphragm formed by the fins 30 is closed. In this configuration, the passage of outside air from the duct 6 is blocked by the fins 30 forming the diaphragm. The inside air can circulate through the recycling openings 8 of the housing 2 and the through openings 23 of the crown 20, which are aligned.

[0084] Any intermediate configuration between these two configurations is possible: in this case, the interior air and the exterior air can both be drawn into the ventilation device 1 with variable proportions which depend on the degree of opening of the diaphragm and the degree of alignment of the through openings 23 and the recycling openings 8.

[0085] Preferably, the recycling module 10 is configured so that the sum of the free, i.e. unobstructed, surfaces of the injection opening 5 and the recycling openings 8 remains substantially constant for any configuration of the recycling module, so as to allow a substantially constant air flow in the ventilation device 1. In particular, the free surface of the injection opening 5 in the configuration for passing outside air may be substantially equal to the surface of the recycling openings 8.

[0086] Figures 9 and 10 are respectively detailed and sectional views of the ventilation device 1 at the interface between the duct 6 and the housing 2 respectively in the configuration for passing outside air and in the configuration for passing inside air.

[0087] The conduit 6 is fluidically connected to the injection opening 5 of the housing 2.

[0088] In the configuration of [Fig.9], the diaphragm formed by the fins 30 is open and the outside air circulating in the duct 6 can pass through the central opening of the annular face 25 to enter the ventilation device. The inside air cannot enter the ventilation device.

[0089] In the configuration of [Fig. 10], the diaphragm formed by the fins 30 is closed and the outside air circulating in the duct 6 cannot pass through the central opening of the annular face 25. The inside air can enter the ventilation device through the through openings 23 of the crown 20, which are arranged opposite the recycling openings 8 of the housing 2.

[0090] Figures 11 and 12 are side views of the ventilation device 1 respectively in the configuration for passing outside air and in the configuration for passing inside air. Figures 13 and 14 are perspective views of the ventilation device 1 respectively in the configuration for passing outside air and in the configuration for passing inside air.

[0091] As visible in Figures 11 to 14, the rotation of the pivot element 44 of the tilting device 40, controlled by the cable 45, drives the rod 42 and causes the translation of the tab 41 in a direction perpendicular to the axis of the pivot element 44. The translation of the tab 41 in the orifice 9 of the housing causes the rotation of the crown 20 and therefore the opening or closing of the diaphragm formed by the fins 30, as well as the opening or closing of the passage of the interior air through the recycling openings 8. Functioning

[0092] The recycling module 10 makes it possible to selectively pass outside air, inside air or a mixture of the two into the ventilation device 1.

[0093] In the configuration for the passage of outside air, as shown in figures 5, 6, 9, 11, 13, the outside air circulating in the duct 6 enters the ventilation device 1 through the injection opening 5. The fins 30 are arranged between the annular face 25 and a lateral face of the housing 2 extending in a plane perpendicular to the axis of the injection opening 5. The fins 30 are folded and leave the injection opening 5 free. The through openings 23 of the periphery of the crown 20 are arranged opposite solid parts of the housing 2. Similarly, the recycling openings 8 of the housing 2 are arranged opposite solid parts of the crown 20. The inside air cannot therefore enter the ventilation device 1.

[0094] The configuration of the recycling module is modified by action on the cable 45. This may be a manual action carried out by the user, such as rotating a button or pressing a button that causes the cable 45 to move, or a motorized action, controlled by the user or automatic.

[0095] The movement of the cable 45 towards the recycling module 10 causes the pivot element 44 to rotate. The free end of the rod 42, attached to a point on the periphery of the pivot element 44, then rotates around the pivot element 44. Consequently, the rod 42 performs a pivot movement around the pivot connection of the tab 41 and also applies a force to the tab 41 tending to move the tab 41 away from the pivot element 44. The tab 41 being inserted into the hole 24 of the crown 20, this force is communicated to the crown 20 and sets the latter in rotation in the direction of rotation of the pivot element 44.

[0096] The maximum rotation of the crown 20, which corresponds to the maximum displacement of the rod 42, places the recycling module in the configuration for the passage of the interior air as shown in figures 7, 8, 10, 12, 14.

[0097] Each fin 30 is fixedly attached to the housing 2 by the second rivets 32, fixed on the lateral face of the housing. They are also connected to the crown 20 by the first rivets 31, which can slide in the sliding openings 26 of the annular face 25 of the crown 20. Thus, the rotation of the crown 20 forces the sliding of the first rivets 31 and therefore the rotation of each of the fins around the second rivets 23, fixed on the housing 2.

[0098] The fins 30 advantageously hold the crown 20 on the housing 2.

[0099] The dimensions of the recycling module 10 and the number of fins 30 are preferably chosen so that the fins 30 completely cover the free surface of the annular face 25. The presence of the central cone 27 is optional. When it is present, the profile of the fins 30 is preferably shaped so as to match the shape of the central cone 27 when the fins 30 are in contact with the latter in the configuration for passing the interior air.

[0100] The rotation of the crown 20 also causes the movement of the through openings 23 relative to the housing 2. In the configuration for the passage of the interior air, the through openings 23 are arranged opposite the recycling openings 8 of the housing 2, so as to allow the passage of air from the passenger compartment towards the interior of the ventilation device 1.

[0101] Any intermediate configuration between the configuration for passing outside air and the configuration for passing inside air is possible. The diaphragm formed by the fins 30 is then only partially open, as are the recycling openings 8, so that a determined proportion of outside air and inside air can be injected into the ventilation device 1.

[0102] Other variants and improvements may be provided without departing from the scope of the invention.

Claims

Claims

1. Ventilation device (1) for a motor vehicle, comprising a housing (2) having an injection opening (5) configured to be fluidically connected to an outside air inlet duct (6), the ventilation device further comprising a recycling module (10) configured to selectively allow the injection of inside air or outside air into the ventilation device, the recycling module comprising a rotating crown (20) and a diaphragm mounted on the crown so that the rotation of the crown controls the opening or closing of the diaphragm, the recycling module being arranged in the housing so that the diaphragm thus opens or closes the injection opening,the crown comprising a plurality of through openings (23) on a surface of its periphery and the housing comprising a plurality of recycling openings (8) configured so that the through openings of the crown are arranged opposite the recycling openings of the housing when the crown is in a diaphragm closing position and the through openings of the crown are arranged opposite solid parts of the housing when the crown is in a diaphragm opening position, so as to respectively form an interior air passage configuration in which the injection opening is closed and the recycling openings are open, and an exterior air passage configuration in which the injection opening is open and the recycling openings are closed.,

2. Ventilation device according to claim 1, the diaphragm comprising a plurality of fins (30) each fixed to the crown by a first rivet (31) forming a pivot connection and capable of sliding in a respective sliding opening (26) of an annular face (25) of the crown and each fixed to the housing by a second rivet (32) fixed on the housing, preferably on a face of the housing parallel to the annular face, forming a pivot connection, so that the rotation of the crown relative to the housing causes the fins to move and thus the diaphragm to open or close.

3. Ventilation device according to one of the preceding claims, the rotation of the crown being controlled by a rocking device (40) comprising a lug (41) secured to the crown, a rod (42) extending in a plane perpendicular to the axis of rotation of the crown and connected by one of its ends to the lug by a pivot connection and at the other of its ends to the periphery of a pivot element (44) which can pivot around an axis parallel to the axis of rotation of the crown, so that the pivoting of the pivot element causes a translation of the lug and thus the rotation of the crown.

4. Ventilation device according to one of the preceding claims, the crown comprising a central cone (27) arranged in the center of the crown.

5. A ventilation device according to the preceding claim in combination with claim 2, wherein the fins have a main body and an inner profile (33) shaped to match the shape of the central cone in the interior air passage configuration in which the fins are in contact with the central cone by the inner profile.

6. Ventilation device according to the preceding claim, the internal profile of the fins being made of a less rigid material than the material of the main body of the fins.

7. Ventilation device according to one of the preceding claims, the sum of the unobstructed surface of the recycling openings and the unobstructed surface of the injection opening being constant regardless of the degree of rotation of the crown.

8. Ventilation device according to one of the preceding claims, the crown being movable in rotation over an angle of between 18° and 25°, preferably equal to 23°.

9. Motor vehicle, in particular of the quadricycle type, comprising a ventilation device according to one of the preceding claims.

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