WO2023175006A1

WO2023175006A1 - Motorised ventilation unit

Info

Publication number: WO2023175006A1
Application number: PCT/EP2023/056614
Authority: WO
Inventors: Fabrice Ailloud; Thierry Barbier; Nestor Ismaël VARELA SANTOYO
Original assignee: Valeo Systemes Thermiques
Priority date: 2022-03-18
Filing date: 2023-03-15
Publication date: 2023-09-21
Also published as: FR3133661A1; FR3133661B1

Abstract

The invention relates to a motorised ventilation unit (2) for a ventilation, heating and/or air conditioning device, the unit comprising at least one turbine (4) configured to be rotated about an axis of rotation (R), a motor (6) for rotating the turbine (4), an air inlet housing configured to supply at least one airflow to the turbine (4) and a spiral casing (10) surrounding the turbine (4), which spiral casing is configured to channel the at least one airflow at the outlet of the turbine (4), the motorised ventilation unit (2) comprising at least one separating member (24) at least partly arranged in a volume (22) of the turbine (4), the motorised ventilation unit (2) comprising at least a first outlet duct (46) and a second outlet duct (48 that are angularly offset from each other along the axis of rotation (R), the motorised ventilation unit also having a diverging profile.

Description

MOTORIZED VENTILATION UNIT

The present invention relates to ventilation, heating and/or air conditioning devices for regulating a temperature of an air flow directed towards different areas of a vehicle passenger compartment. More particularly, the invention relates to the means for setting in motion the air flow within this ventilation, heating and/or air conditioning device.

Motor vehicles usually include a passenger compartment into which at least one flow of air arrives, conventionally from a ventilation, heating and/or air conditioning device, in which it has undergone heat treatment. Such a ventilation, heating and/or air conditioning device can be supplied either with air from outside the passenger compartment, also called fresh air, or with recycled air, that is to say coming from the passenger compartment of the vehicle. In known manner, a motorized ventilation unit of the ventilation, heating and/or air conditioning device is used to circulate this flow of recycled air.

In order to improve the performance of the ventilation, heating and/or air conditioning device, it is known to dissociate the fresh and recycled air flows as they pass through the device, in order to allow the majority or exclusive use of one of the air flows according to the needs of the vehicle occupants. It is particularly advantageous to use mainly the flow of recycled air which has a temperature close to a temperature to be reached, unlike the flow of fresh air coming from the outside. However, recirculated air is higher in humidity than fresh air and can condense on glass surfaces of the vehicle, such as a windshield, thus endangering vehicle occupants when using the vehicle. Thus, when the air flow leaving the device is directed near or towards a glass surface, it is preferable to use mainly the air flow coming from outside the vehicle.

Motorized ventilation units capable of allowing this separation of air flows, although effective, can be improved. In particular, the homogeneity of the distribution of the air flow at the outlet of the motorized ventilation unit can be improved. On the other hand, the separation of air flows within the ventilation, heating and/or air conditioning device can also be optimized.

The aim of the present invention is therefore to propose a motorized ventilation unit which effectively ensures the separation of air flows at the inlet and outlet of the motorized ventilation unit, while optimizing the homogeneity of the distribution of the air flow. at the outlet of said motorized ventilation unit.

The invention then relates to a motorized ventilation unit for a ventilation, heating and/or air conditioning device, comprising at least one turbine configured to be driven in rotation around an axis of rotation, a motor intended to rotate the turbine, an air inlet box configured to bring at least one air flow to the turbine and a volute surrounding the turbine and configured to channel the at least one air flow out of the turbine, the box air inlet comprising at least a first air inlet and a second air inlet distinct from each other, the motorized ventilation unit comprising at least one separation member arranged at least partly in a volume delimited by the turbine such that it delimits at least a first air path and a second air path aeraullically connected respectively to the first air inlet and the second air inlet of the inlet box of air, the volute comprising at least two portions separated from each other by a separation wall, a first portion being in aeraulic communication with the first air path and a second portion being in aeraulic communication with the second air path, the motorized ventilation unit comprising at least a first outlet duct in aeraulic communication with the first portion and a second outlet duct in aeraulic communication with the second portion, the first outlet duct and the second outlet duct being at least partly angularly offset relative to each other along the axis of rotation and each of the outlet ducts having a divergent profile following a direction of movement of at least one air flow within the ducts of exit.

The ventilation, heating and/or air conditioning device can be used to regulate a temperature of an air flow directed towards a passenger compartment of a vehicle, for example an automobile. The ventilation, heating and/or air conditioning system can then use an air flow coming from the passenger compartment and/or an air flow coming from an environment outside the passenger compartment, in order to heat or cool the air flow directed towards the passenger compartment. In particular, the origin of one or the other of the air flows is conditioned by the zone to which this air flow is sent in the passenger compartment of the vehicle. The use of an air flow coming mainly from the environment outside the vehicle will be favored when the air flow is directed towards a glass surface of the passenger compartment, the latter being less loaded with humidity, while the use of the air flow coming mainly from the passenger compartment will be favored when the air flow is directed away from the glass surfaces of the passenger compartment, for example towards the feet of the vehicle users.

The motorized ventilation unit has the particular function of capturing air flows and aerally separating their path within it according to their origin, from the volume of the passenger compartment or from the environment outside it. Thus, we take advantage of the separation member in that it optimizes the segmentation of the air flows before their entry into the volute, and therefore before their entry into the turbine.

On the other hand, we take advantage of the first outlet duct and the second outlet duct, and in particular their divergent profile, in that they increase and optimize the homogeneous distribution of the air flow at the outlet of the motorized ventilation unit. . More particularly, the structure of the outlet ducts makes it possible to obtain the same quantity of air flow independently of their origin, from the first portion of the volute, or from its second portion.

According to a characteristic of the invention, the divergent profile of each of the outlet conduits extends in two directions intersecting one another taken in the same plane. According to an example of the invention, the two directions are perpendicular to each other. In other words, each of the outlet ducts diverges following the direction of movement of the air flow in these ducts, and opens in two directions perpendicular to each other.

According to one characteristic of the invention, the first outlet conduit and the second outlet conduit are terminated respectively by a first outlet mouth and a second outlet mouth which each have a surface of mouth substantially identical. This ensures the homogenization of the distribution of the air flow at the outlet of the motorized ventilation unit.

According to one characteristic of the invention, the separation member extends axially beyond the volume of the turbine.

According to one characteristic of the invention, the separation member comprises at least one cylindrical portion and a flared portion which extends the cylindrical portion.

According to one characteristic of the invention, the cylindrical portion of the separation member extends at least partly axially beyond the volume of the turbine. The separation member therefore projects from the turbine and extends at least partly into the air inlet housing.

According to one characteristic of the invention, the flared portion of the separation member extends into the volume of the turbine.

According to one characteristic of the invention, the cylindrical portion of the separation member comprises a circular air intake mouth.

According to one characteristic of the invention, the first outlet conduit and the second outlet conduit each respectively comprise an inlet section also forming an evacuation mouth for each portion of the volute, the inlet section having a surface of section strictly less than that of the outlet mouth.

According to one characteristic of the invention, the first portion and the second portion of the volute are at least partly superimposed axially on one another. According to an example of the invention, the first portion and the second portion are strictly superimposed on one another.

According to one characteristic of the invention, the first portion of the volute and the second portion of the volute are angularly offset relative to each other around the axis of rotation R of the turbine, this angular offset being preferably equal to the angular offset between the first outlet conduit and the second outlet conduit.

According to a characteristic of the invention, the first portion of the volute and the second portion of the volute have profiles which are strictly superimposable. by rotation around the axis of rotation of the turbine combined with translation along the axis of rotation of the turbine.

According to one characteristic of the invention, the outlet mouths of the outlet ducts extend in a common plane which is parallel to the axis of rotation of the turbine. More particularly, the common plane of the outlets comprises at least one straight line parallel to the axis of rotation of the turbine.

According to one characteristic of the invention, the outlet mouths of the outlet ducts are aligned along an axis which is perpendicular to the axis of rotation of the turbine.

According to one characteristic of the invention, an opening plane of an outlet opening of the separation member is offset axially from a separation plane of the separation wall of the volute.

The invention also relates to a ventilation, heating and/or air conditioning device for a passenger compartment of a vehicle comprising at least one motorized ventilation unit according to any of the preceding characteristics, the motorized ventilation unit being configured to simultaneously supply an air flow which comes from the passenger compartment or an air flow which comes from an environment outside the passenger compartment.

Other characteristics, details and advantages of the invention will emerge more clearly on reading the description given below for information purposes in relation to the drawings in which:

[Fig 1] is a general perspective view of a vehicle comprising at least one ventilation, heating and/or air conditioning device;

[Fig 2] is a perspective view of a motorized ventilation unit of the ventilation, heating and/or air conditioning device of Figure i;

[Fig 3] is a sectional view along a Y-Y plane illustrated in Figure 2 of the motorized ventilation unit of Figure 2;

[Fig 4] is a perspective view of part of the motorized ventilation unit of Figure 2;

[Fig 5] is an axial sectional view of the motorized ventilation group taken in a plan XX illustrated in Figure 4;

[Fig 6] is a front view of the at least two outlet ducts of the motorized ventilation unit according to the invention.

It should first be noted that if the figures present the invention in detail for its implementation, these figures can of course be used to better define the invention, if necessary. It should also be noted that these figures only show a few examples of implementation of the invention.

Figure 1 illustrates a ventilation, heating and/or air conditioning device 1 for a passenger compartment 3 of a vehicle 5, here automobile, intended to regulate the temperature of an air flow F sent into the passenger compartment 3. The device ventilation, heating and/or air conditioning 1, hereinafter called device 1, ensures aeraulic and thermal treatment of the air flow

F directed towards the passenger compartment 3 of the vehicle by modifying the temperature of an air flow Fi coming from the passenger compartment 3 and/or an air flow F2 coming from an environment outside the passenger compartment 3. The use of one and/or the other of the air flows Fi, F2 coming from the passenger compartment 3 or from the external environment of the passenger compartment 3 is conditioned on the needs of a user of the vehicle 5, and in particular as a function of a zone of the passenger compartment 3 at which the air flow F at the outlet of the device 1 is directed.

According to a non-limiting example of the invention, when the air flow F leaving the device 1 is directed towards a glazed surface 7 of the passenger compartment 3, the majority use of the air flow F2 coming from the environment outside the passenger compartment 3 is preferred, while the majority use of the air flow Fi coming from the passenger compartment 3 is preferred when the air flow F leaving the device 1 is directed into an area of the passenger compartment 3 at distances from the glass surfaces 7. Indeed, the air flow Fi coming from the passenger compartment 3, although at a temperature close to the desired temperature, is more loaded with humidity, in particular by the breathing of at least one user of the vehicle 5 and can therefore cause condensation phenomena on the glass surfaces 7 of the vehicle 5. Furthermore, the air flow F2 coming from the environment outside the passenger compartment 3, although cooler than the flow The air Fi coming from the passenger compartment 3, is less loaded with humidity than the latter and is therefore preferred when the air flow F at the outlet of device i is directed towards one of the glass surfaces 7, in order to avoid condensation phenomena.

It is also understood that the device 1 can use a mixture of the air flow Fi coming from the passenger compartment 3 and the air flow F2 coming from the environment outside the passenger compartment 3.

The device 1 according to the invention comprises at least one motorized ventilation unit 2 particularly visible in Figures 2 to 6.

The motorized ventilation unit 2 comprises at least one turbine 4, visible in Figure 5, configured to be driven in rotation around an axis of rotation R, a motor 6, partially visible in Figure 2, intended to drive in rotation the turbine 4. The motorized ventilation unit 2 also comprises an air inlet box 8, visible in Figures 2 and 3, configured to bring at least one of the air flows Fi, F2 to the turbine 4 and a volute 10 surrounding the turbine 4 and configured to channel the air flows leaving the turbine 4.

The air inlet box 8, visible in Figures 2 and 3, comprises at least a first air inlet 12 and a second air inlet 14 distinct from the first air inlet 12. More precisely, the first air inlet 12 is intended to receive the air flow F2 coming from the environment outside the passenger compartment, while the second air inlet 14 is intended to receive the air flow Fi coming of the passenger compartment. Thus, we understand that the first air inlet 12 and the second air inlet 14 ensure the routing of the air flows Fi, F2 towards the turbine 4, and in particular towards an opening 16 of the turbine 4.

To this end and as visible in Figures 2 and 3, the first air inlet 12 and the second air inlet 14 each comprise a closing member 15 removable between an open position and a closed position, in order to authorize or block the passage of the air flow Fi, F2 towards the turbine 4. Thus, the first air inlet 12 allows the routing of the air flow F2 coming from the environment outside the passenger compartment when its closing member 15 is in an open position as visible in Figure 3 illustrating a sectional view along the plane YY visible in Figure 2, and the second air inlet 14 allows the routing of the air flow Fi coming from the passenger compartment when its closing member 15 is in an open position as visible in Figure 3. According to a non-limiting example of the invention, the air inlet box 8 comprises two first air inlets 12 arranged on either side of the closing member 15.

The turbine 4, or otherwise called propeller, is intended to suck in and expel the air flows Fi, F2 coming from the first air inlets 12 or the second air inlet 14. In addition, the turbine 4 comprises a plurality of blades 18, arranged radially around the axis of rotation R of said turbine 4 and aligned along this axis of rotation R, being spaced from each other. The rotation of the blades 18 of the turbine 4 generates movement of the air flows Fi, F 2 and their expulsion outside a volume 22 of the turbine, towards the volute 10.

As visible in Figure 5, the turbine 4 comprises at least one bowl 20 and the aforementioned opening 16, opposite each other along the axis of rotation R of the turbine 4, the opening 16 allowing the passage of air flows from the air inlets of the air inlet box towards a volume 22 delimited by the opening 16, the blades 18 and the bowl 20 of the turbine 4. It is understood that the bowl 20 allows to close the volume 22 of the turbine 8 opposite the opening 16 in an axial direction relative to the axis of rotation R of the latter.

According to the example of the invention illustrated, at least one separation member 24 is arranged at least partly in the volume 22 delimited by the turbine 4. Thus, the separation member 24 makes it possible to separate the volume 22 from the turbine 4 into a first air path 26 and a second air path 28. We then define an external face 30 of the separation member 24 facing the blades 18 of the turbine 4 and an internal face 32 opposite the external face 30. Thus, the external face 30 of the separation member 24 and the blades 18 of the turbine 4 delimit the first air path 26, while the internal face 32 of the separation member 24 delimits the second air path 28.

Thus and as visible in Figure 3, the first air path 26 and the second air path 28 are aerulically connected respectively to the first air inlet 12, here to the first two air inlets 12, and to the second air inlet 14. In other words, the first air path 26 corresponds to a first part of the volume 22 delimited by the turbine 4 and the second air path 28 corresponds to a second part of the volume 22 delimited by the turbine 4, distinct from the first part. Thus, the first air inlet 12 and the first air path 26 are aerulically isolated from the second air inlet 14 and the second air path 28.

According to the example of the invention and as particularly visible in Figures 3 and 5, the separation member 24 extends axially beyond the volume 22 delimited at least in part by the turbine 4. More precisely, a cylindrical portion 34 and a flared portion 36 of the separation member 24 are defined, the flared portion 36 extending the cylindrical portion 34. The cylindrical portion 34 has in particular an air intake mouth 38 of circular shape, the intake mouth 38 being aeraullically connected with the second air inlet 14 of the air inlet box 8.

The flared portion 36 then extends into the volume 22 delimited by the turbine 4, while the cylindrical portion 34 extends at least partly axially above the volume 22 of the turbine 4, in a space delimited by the housing air inlet 8. It is further understood that the flared portion 36 extends radially towards the blades 18 so as to participate in the aeraulic separation between the first air path 26 and the second air path 28 .

According to the invention, the volute 10 comprises at least two portions 40, visible in Figure 5, aerally distinct from each other by being separated by a separation wall 42. We then define a first portion 40a and a second portion 40b of the volute 10 which in particular has a snail shape, as visible in Figure 4, extending around the axis of rotation R of the turbine 4. In other words, the first portion 40a and the second portion 40b forms two hollow cylinders whose central space is occupied by the volume 22 of the turbine 4. The first portion 40a and the second portion 40b of the volute 10 are thus superimposed one on the other the axis of rotation R. Such superposition of the portions 40 of the volute 10 allows the first portion 40a to be in aeraulic communication with the first air path 26 and the second portion 40b to be in aeraulic communication with the second path air 28.

As is particularly visible in Figure 5, the separation member 24 comprises an outlet opening 44 which terminates the flared portion 36, forming a free end of the latter. The outlet opening 44 then extends in an opening plane PO which is offset axially with respect to a plane of IO separation PS in which the separation wall 42 of the volute 10 extends. The flared portion 36 of the separation member 24 then has a flaring curvature inscribed in a circle with a diameter between 40 and 55 mm, preferably 50mm, the center of this circle being placed substantially in the vicinity of 25mm from the cylindrical portion 34 of the separation member 24. Such an arrangement makes it possible to accompany the air flows circulating both along the external face 30 and both along the internal face 32 of the separation member 24. In addition, the particular combination of the position of the outlet opening 44 of the separation member 24 relative to the separation wall 42, and the radius of the flared portion 36 of said separation member 24, advantageously makes it possible to optimize the circulation and distribution of the air flow from the first air path 26 towards the first portion 40a of the volute 10 and from the second air path 28 towards the second portion 40b of the volute 10. We thus exploit the entire height of the portions 40 of the volute 10 for the circulation of air flows coming from the air paths 26, 28 respectively.

According to the invention and as visible in Figures 4 or 6, the motorized ventilation unit 2 comprises at least a first outlet duct 46 and a second outlet duct 48 in aeraulic communication respectively with the first portion 40a and the second portion 40b of the volute 10. The first outlet conduit 46 and the second outlet conduit 48 are angularly offset relative to each other around the axis of rotation R of the turbine 4, such that a section inlet SE of each of the outlet conduits 46, 48, also forming an evacuation mouth of each portion 40 of the volute 10, are offset angularly relative to each other, along the axis of rotation R of the turbine 4. It is understood in particular that the angular offset is taken in a plane perpendicular to the axis of rotation R of the turbine 4.

The first portion 40a of the volute 10 and the second portion 40b of the volute lo are offset angularly relative to each other around the axis of rotation R of the turbine 4, this angular offset being preferably equal to the offset angular between the first outlet conduit 46 and the second outlet conduit 48.

The first portion 40a of the volute 10 and the second portion 4ob of the volute 10 have profiles which are strictly superimposable by rotation around the axis of rotation R of the turbine 4 combined with a translation along the axis of rotation R of the turbine 4.

As illustrated in Figure 6, each of the outlet ducts 46, 48 has a divergent profile following a direction of movement of the air flows within the motorized ventilation group 2. In particular, the divergent profile of each of the ducts of outlet 46, 48 extends in two directions intersecting each other, here perpendicular to each other and one of the directions is axial.

It is thus understood that the divergent profile of the outlet conduit 46 and/or 48 widens starting from their inlet section SE in two directions Ai and A2 perpendicular to each other. According to one aspect, the direction A2 is parallel to the axis of rotation R of the turbine 4.

We define an outlet mouth 50 of each of the outlet conduits 46, 48, and in particular a first outlet mouth 50a of the first outlet conduit 46 and a second outlet mouth 50b of the second outlet conduit 48. According to the example of the invention illustrated, the first outlet mouth 50a and the second outlet mouth 50b each have a rectangular shape. More particularly, each of the outlet mouths 50 of the outlet conduits 46 have a mouth surface SB close to one another. We thus offer the possibility of distributing the output of the air flows in a homogeneous manner between the air flow circulating in the first outlet duct 46 and the air flow circulating in the second outlet duct 48. We also understand that the outlet mouths 50 of each of the outlet ducts 46, 48 are opposite the inlet sections SE of their respective outlet ducts 46, 48, following a direction of movement of the air flow within said outlet ducts 46 , 48.

According to an aspect visible in Figure 6, we note that the inlet section SE of the first outlet conduit 46 is offset axially, that is to say along the axis of rotation R, relative to the section SE inlet of the second outlet conduit 48.

According to a characteristic of the invention visible in Figure 6, each of the inlet sections SE of each of the outlet conduits 46, 48 has a section surface Si strictly less than the mouth surface SB of the corresponding outlet mouth 50 . We understand that such a characteristic is implemented by the divergent nature of the outlet conduits 46, 48 mentioned previously. Such a characteristic contributes in particular to increasing the surface area used by the air flows leaving the motorized ventilation unit 2.

As visible in Figures 4 and 6, the first outlet 50a and the second outlet 50b of the outlet ducts 46, 48 extend in a common plane PC which is parallel to the axis of rotation R of the turbine 4. In other words, the common plane PC of the outlets 50 of the outlet ducts 46, 48 comprises at least one straight line which is parallel to the axis of rotation R of the turbine 4. Furthermore, the outlets of outlet 50 of the outlet conduits 46, 48 are aligned along an axis Ai which is perpendicular to the axis of rotation R of the turbine 4.

We take advantage of the invention as it has just been described in that it makes it possible to segment the entire motorized ventilation unit according to the air flows coming from the passenger compartment or the external environment. , by the installation of the separation member within the volume delimited by the turbine. The invention also makes it possible to increase and optimize the homogenization of the distribution of the air flow leaving the motorized ventilation unit, in particular by means of outlet ducts with a divergent profile.

The invention as it has just been described cannot, however, be limited to the means and configurations exclusively described and illustrated, and also applies to all equivalent means or configurations and to any combination of such means or configurations.

Claims

1. Motorized ventilation unit (2) for a ventilation, heating and/or air conditioning device (1) of a vehicle, comprising at least one turbine (4) configured to be driven in rotation around an axis of rotation ( R), a motor (6) intended to rotate the turbine (4), an air inlet box (8) configured to bring at least one air flow (Fl, F2) to the turbine (4 ) and a volute (10) surrounding the turbine (4) and configured to channel at least one air flow (Fi, F2) at the outlet of the turbine (4), the air inlet box (8 ) comprising at least a first air inlet (12) and a second air inlet (14) distinct from each other, the motorized ventilation unit (2) comprising at least one separation member (24) arranged at least partly in a volume (22) delimited by the turbine (4) such that it delimits at least a first air path (26) and a second air path (28) aeraullically connected respectively to the first air inlet (12) and the second air inlet (14) of the air inlet housing (8), the volute (10) comprising at least two separate portions (40, 40a, 40b) one from the other by a separation wall (42), a first portion (40a) being in aeraulic communication with the first air path (26) and a second portion (40b) being in aeraulic communication with the second air path (28), the motorized ventilation unit (2) comprising at least a first outlet duct (46) in aeraulic communication with the first portion (40a) and a second outlet duct (48) in aeraulic communication with the second portion (40b), the first outlet conduit (46) and the second outlet conduit (48) being at least partly angularly offset relative to each other along the axis of rotation (R) and each of the outlet ducts (46, 48) having a divergent profile following a direction of movement of at least one air flow (Fi, F2) within the outlet ducts (46, 48).

2. Motorized ventilation unit (2) according to the preceding claim, in which the diverging profile of each of the outlet ducts (46, 48) extends in two directions intersecting one another taken in the same plane.

3. Motorized ventilation unit (2) according to any one of the preceding claims, in which the first outlet duct (46) and the second outlet duct (48) are terminated respectively by a first outlet mouth (50a) and a second outlet mouth (50b) which each have a substantially identical mouth surface (SB).

4. Motorized ventilation unit (2) according to any one of the preceding claims, in which the separation member (24) extends axially beyond the volume (22) of the turbine (4).

5. Motorized ventilation unit (2) according to any one of the preceding claims, wherein the separation member (24) comprises at least one cylindrical portion (34) and a flared portion (36) which extends the cylindrical portion ( 34).

6. Motorized ventilation unit (2) according to the preceding claim, in which the cylindrical portion (34) of the separation member (24) extends at least partly axially beyond the volume (22) of the turbine (4).

7. Motorized ventilation unit (2) according to claim 5 or 6, in which the flared portion (36) of the separation member (24) extends into the volume (22) of the turbine (4).

8. Motorized ventilation unit (2) according to any one of claims 5 to 7, in which the cylindrical portion (34) of the separation member (24) comprises a circular air intake port (38). .

9. Motorized ventilation unit (2) according to any one of the preceding claims, in which the first outlet duct (46) and the second outlet duct (48) each respectively comprise an inlet section (SE) also forming an evacuation mouth for each portion (40) of the volute (10), the inlet section (SE) having a cross-sectional area (Si) strictly less than that of the outlet mouth (50).

10. Motorized ventilation unit (2) according to any one of the preceding claims, in which the first portion (40a) and the second portion (40b) of the volute (10) are at least partly superposed axially on one another. the other.

11. Motorized ventilation unit (2) according to any one of the preceding claims in combination with claim 3, in which the outlets (50, 50a, 50b) of the outlet ducts (46, 48) extend into A common plane (PC) which is parallel to the axis of rotation (R) of the turbine (4).

12. Motorized ventilation unit (2) according to any one of the preceding claims, in which an opening plane (PO) of an outlet opening (44) of the separation member (24) is offset axially d a separation plane (PS) of the separation wall (42) of the volute (10).

13. Motorized ventilation unit (2) according to any one of the preceding claims, in which the first portion (40a) of the volute (10) and the second portion (40b) of the volute (10) are angularly offset the one relative to the other around the axis of rotation (R) of the turbine (4), this angular offset being preferably equal to the angular offset between the first outlet conduit (46) and the second outlet conduit ( 48).

14. Motorized ventilation unit (2) according to any one of the preceding claims, in which the first portion (40a) of the volute (10) and the second portion (40b) of the volute (10) have profiles which are strictly superimposable by rotation around the axis of rotation (R) of the turbine (4) combined with a translation along the axis of rotation (R) of the turbine (4).

15. Ventilation, heating and/or air conditioning device (1) for a passenger compartment (3) of a vehicle (5) comprising at least one motorized ventilation unit (2) according to any one of the preceding claims, the motorized unit ventilation (2) being configured to simultaneously provide a flow of air (Fi) which comes from the passenger compartment (3) or an air flow (F2) which comes from an environment outside the passenger compartment (3) .