Engine mount and corresponding airflow generator of a heating, ventilation and / or air conditioning system in a vehicle, particularly an automobile

Abstract

Motor mount (22) for an airflow generator (1) of a heating, ventilation and / or air conditioning system of a motor vehicle, the motor mount (22) comprising: - a first face (22a) configured for the attachment of a stator (24), and - a second face (22b), opposite the first face (22a), comprising a cooling channel (73) through which an airflow is intended to circulate, said cooling channel (73) bypassing the internal structure (221), the cooling channel (73) having at least one air inlet (74) and at least one air outlet (75), the air inlet (74) having a first orifice (225) formed in the motor mount (22), the motor mount (22) further comprising an elastomer tip (25) disposed at the end of the first orifice (225) opposite the cooling channel (73), said elastomer tip (25) bordering said first orifice (225). Abbreviated figure: Fig 5

Description

Title of the invention: Engine mount and corresponding airflow generator for a heating, ventilation and / or air conditioning system of a vehicle, particularly an automobile

[0001] The present invention relates to the field of heating, ventilation, and / or air conditioning systems for vehicles, particularly automobiles. More particularly, the invention relates to a motor support for a fan wheel, especially one used in an airflow generator. The invention also relates to an airflow generator for a heating, ventilation, and / or air conditioning system comprising such a motor support.

[0002] Vehicles, particularly automobiles, are commonly equipped with a heating, ventilation, and / or air conditioning (HVAC) system, which creates an airflow within the passenger compartment. Such a system also manages the temperature and distribution of the airflow within the passenger compartment. This HVAC system includes, among other things, a fan with a fan wheel driven by a motor, which may be electric. The electric motor may be electronically commutated and controlled by a control module.

[0003] An electronically commutated electric motor, or brushless DC motor (also known by the English name "brushless"), comprises a rotor and stator assembly, each of these components carrying electromagnetic elements whose interaction generates the movement of the rotor relative to the stator, and thus the movement of the fan wheel.

[0004] The electric motor is assembled in the heating, ventilation and / or air conditioning installation by means of a motor support which includes a base with an internal structure allowing the fixing of the electric motor, more precisely the stator.

[0005] The motor and the control module have components that heat up during use; therefore, it is necessary to ensure the cooling of the motor and / or the control module.

[0006] To this end, it is known to utilize the airflow circulating within the heating, ventilation, and / or air conditioning system. To do this, a portion of the airflow generated by the airflow generator is drawn off and directed to the engine mount. Thus, the base of the engine mount includes at least one cooling channel to channel the drawn airflow. The cooling channel is generally shaped to guide the drawn airflow towards the engine or the control module.

[0007] A constant objective is to optimize the cooling performance of the motor or control module and to increase the aerodynamic performance of the airflow generator. Furthermore, the implementation of the cooling channel must not hinder easy mounting of the airflow generator.

[0008] The object of the present invention is to provide a motor support, particularly for an airflow generator in a heating, ventilation and / or air conditioning system of a motor vehicle, that is simple to manufacture and optimizes cooling performance. Another object of the present invention is to increase overall aerodynamic performance.

[0009] To this end, the present invention relates to a motor mount for an airflow generator of a heating, ventilation and / or air conditioning system of a motor vehicle, the motor mount comprising: - a first face configured for the attachment of a stator, and - a second face, opposite the first face, comprising a cooling channel in which an airflow is intended to circulate for the cooling of the stator and / or of an airflow generator control module intended to be fixed to the motor support, said cooling channel bypassing the internal structure, the cooling channel having at least one air inlet and at least one air outlet, the air inlet having a first orifice provided in the motor support, the motor support further comprising an elastomer tip disposed at the end of the first orifice opposite the cooling channel, said elastomer tip bordering said first orifice.

[0010] According to one aspect of the invention, the elastomer tip is overmolded at the end of the first orifice.

[0011] According to another aspect of the invention, the end of the first orifice comprises a conduit projecting opposite the cooling channel, the elastomer tip being disposed at the end of said conduit.

[0012] According to another aspect of the invention, the elastomer tip comprises a hollow body forming a conduit extending the first orifice and a lip extending substantially perpendicularly to the axis of elongation of the body over the entire circumference of the end of the body opposite the first orifice.

[0013] According to another aspect of the invention, the first orifice and the body of the elastomer tip have an oblong profile.

[0014] According to another aspect of the invention, the elastomer tip has at least one reinforcing rib between the body and the lip.

[0015] According to another aspect of the invention, the lip is concave.

[0016] The present invention also relates to an airflow generator comprising a motor support as described above, said airflow generator comprising a deflector covering at least partially the first face of the motor support, said deflector comprising a second orifice disposed opposite the first orifice of the motor support, the elastomer tip being compressed between the motor support and the deflector so as to ensure a sealed fluidic continuity between the first and second orifice.

[0017] According to one aspect of the airflow generator according to the invention, the first face of the motor support comprises a first wall, said first wall projecting towards the portion of the deflector covering said first face, said first wall delimiting an enclosure around the stator, and in that said portion of the deflector comprises a second wall projecting towards the first face of the motor support, an elastomeric sealing lip being disposed between said first and second walls.

[0018] According to another aspect of the airflow generator according to the invention, the elastomer lip is overmolded to the end of one of the first or second wall.

[0019] Other features and advantages of the invention will become apparent from the following description, given by way of example, without limitation, with reference to the drawings attached below.

[0020] [Fig-1] [Fig.1] shows a schematic exploded perspective representation of a airflow generator,

[0021] [Fig.2] [Fig.2] shows a schematic perspective representation of the rear of an engine mount of an airflow generator,

[0022] [Fig.3] [Fig.3] shows a schematic perspective representation of a cooling channel for an engine mount,

[0023] [Fig.4] [Fig.4] shows a schematic representation in side view and in section of an engine mount,

[0024] [Fig.5] [Fig.5] shows a schematic perspective representation from a front view of an elastomer tip,

[0025] [Fig.6] [Fig.6] shows a schematic perspective representation from a rear view of the elastomer tip of [Fig.5].

[0026] In these figures, identical elements bear the same reference numbers.

[0027] The following embodiments are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference relates to the same embodiment, or that the features apply only to a single embodiment. Simple features from different embodiments can also be combined and / or interchanged to provide other embodiments.

[0028] In this description, certain elements or parameters can be indexed, such as first element or second element, first parameter and second parameter, first criterion and second criterion, etc. In this case, it is simply a matter of indexing to differentiate and name similar but not identical elements, parameters, or criteria. This indexing does not imply any priority of one element, parameter, or criterion over another, and such designations can easily be interchanged without departing from the scope of this description. Nor does this indexing imply any order in time, for example, for evaluating one criterion or another.

[0029] Figure 1 illustrates an airflow generator 1 for drawing in and blowing air. The airflow generator 1 comprises a motor block 2 and an electronic control block 3 located in line with each other along a principal longitudinal axis X (illustrated by a dashed line). The electronic control block 3 is thus positioned to supply power to the motor block 2 while limiting the magnetic interference generated by its own internal components, which will be described later.

[0030] The motor block 2 consists of a brushless electric motor, also called an electronically commutated electric motor. It is capable of rotating a fan wheel 28 via an output shaft 260 of said motor block 2, extending along said longitudinal axis X.

[0031] The motor block 2 mainly comprises a stator 24 equipped with an excitation winding and a rotor 26, carrying the output shaft 260 suitable for driving the fan wheel 28. The rotor 26 is arranged around the stator 24 to be driven into rotation under the effect of magnetic fields generated by the winding and the magnets associated with the rotor 26.

[0032] The rotor 26 may include, in particular, a cup 264 that is symmetrical by rotation about the longitudinal axis X and bell-shaped. The rotor 26 also includes magnets (not shown) fixed to an inner face of the cup 264, in particular on a cylindrical strip of the inner face of the cup 264. The cup 264 of the rotor 26 is fixed at its center to the output shaft 260. The output shaft 260 constitutes the output (or rotation) shaft of the electric motor 14, which drives the fan wheel 12. For this purpose, the fan wheel 26 is directly fixed to the output shaft 260.

[0033] The stator 24 can be symmetrical by rotation about the longitudinal axis X. The stator 24 can in particular include a shaft 240 extending mainly along the direction of the longitudinal axis X. The cup 264 of the rotor 26 notably covers one end of the shaft 240 opposite its base (not visible).

[0034] As illustrated in [Fig. 1], the barrel 240 includes, in particular, a base and an internal channel (not visible). The internal channel passes completely through the barrel 240 in the direction of the longitudinal axis X. The internal channel may be generally cylindrical. The internal channel may include at least one housing for receiving a bearing ring into which the shaft 260 is inserted. Preferably, two housings are formed in the internal channel of the barrel 240. Each housing is for receiving a bearing ring, in particular a ball bearing. These housings are more specifically arranged at the ends of the internal channel. The shaft 260 is partially received in the internal channel of the stator 24, which is free to rotate about the longitudinal axis X relative to the stator 24, by means of the bearing rings. The bearing rings may, in particular, be retained within their respective housings by means of an internal retaining ring such as a circlip.

[0035] The barrel 240 also comprises a plurality of branches extending radially with respect to the longitudinal axis X. The branches project from the barrel 240. The barrel 240, and more particularly its branches 31, are made of an electrically non-conductive material, for example, plastic. The barrel 240 may, in particular, be a single piece in that there is continuity of material between the branches and the barrel 240. An alternative, not shown, may be that the branches are made on a separate part having a central annular portion from which the branches project and which is fixed to the barrel 240. The barrel 240 is, for example, produced by molding, in particular by injection molding.

[0036] A stack of metal sheets is arranged on the arms of the drum 240. The stator 24 also includes an insulator that covers the stack of metal sheets. The stack of metal sheets is thus held and sandwiched between the arms of the drum 240 and the insulator. The insulator is also made of an electrically non-conductive material.

[0037] The arms form a winding support around which at least one winding 242 is wound. Each winding 242 corresponds to one phase of the electric motor. A three-phase electric motor thus comprises a multiple of three sets of windings 242, for example, twelve. The windings 242 are made by windings of a metallic wire, generally copper, around the arms of the stator 24. These windings are arranged so as to be in contact only with the arms of the shaft 240 and so as not to be in electrical contact with the stack of metal laminations.

[0038] The stator 24, more particularly the base of the shaft 240, is notably fixed to a motor support 22, for example by means of screws. This motor support 22 is also made of an electrically non-conductive material. The motor support 22 may also be symmetrical by rotation about the longitudinal axis X and have a central opening above which the shaft 240 is fixed. The rotor 26 and in particular the external edges of the cup 264 can in particular pass vertically over said support 16.

[0039] Opposite a first face 22a of the motor support 22, from which the stator 24 protrudes, a control module 34 is fixed to a second face 22b of the motor support 22, for example by means of screws. The control module 34 includes, in particular, a printed circuit board, electrical and electronic components for controlling the airflow generator 1 and for supplying power to the windings 242 of the stator 24. Each winding 242 is electrically connected to the control module 34 and to its power supply.

[0040] As illustrated in Figures 2 and 3, the motor support 22 has an internal structure 221. This internal structure 221 is positioned directly above the stator 24 and allows the stator 24 to be fixed to the motor support 22. Within this internal structure 221, the motor support 22 has a central opening through which the shaft 260 passes. Also within the internal structure 221, the second face 22b of the motor support 22 has a circular housing 222 around its central opening. This housing 222 is intended to receive a bearing located at the end of the shaft 260. The internal structure 221 also has openings through which tabs 224 protruding from the stator 24 can pass to allow the electrical connection between the windings 242 of the stator 24 and the control module 34 and their power supply.

[0041] Returning to [Fig. 1], a metal plate 32 is positioned between the control module 34 and the motor support 22. The metal plate 32 is connected to ground. The electrical connections of the windings 242 pass through the metal plate 32 without electrical contact via openings (not shown). This metal plate 32 performs various functions, including grounding, heat dissipation, and protection against electromagnetic waves.

[0042] The metal plate 32 and the control module 34 are advantageously covered by a cover 36. When the electronic control block 3 is assembled, the control module 34, the metal plate 32 and the cover 36 are held together by means of through-fastening means (not shown), for example, screws.

[0043] The airflow generator 1 also includes a hood or deflector 23 symmetrical by rotation about the longitudinal axis X disposed between the motor support 22 and the outer edges of the fan wheel 28. This deflector 23 includes in particular a central opening 231 through which the stator 24 and the rotor 26 pass.

[0044] In the example illustrated in [Fig. 1], the deflector 23 is a single piece and more particularly comprises an internal portion 23a partially covering the first face 22a of the motor support 22 and a second, so-called external portion 22b surrounding the edge of the motor support 22. The internal portion 23a of the deflector 23 includes, in particular, the opening 231 through which the stator 24 and the rotor 26 pass. The deflector 23 can, in particular, be fixed to the motor support 22 by means of elastic buffers 233. More specifically, these elastic buffers 233 are arranged on the edge of the motor support 22 and the external portion 23b of the deflector 23 is fixed to said elastic buffers 233.

[0045] The deflector 23, more particularly its external portion 23b, is intended in particular to be fixed to a stable structure, for example in a structural housing of a heating, ventilation and / or air conditioning device (not shown) within a motor vehicle.

[0046] The elastic buffers 233 act as shock absorbers to dampen the vibrations and relative movements of the engine mount 22 and the engine block 2 with respect to the deflector 23. The engine block 2 is subject to vibrations due to the rotation of the rotor 26 and the fan wheel 28 relative to the deflector 23, which is fixed to a stable structure of the motor vehicle. This helps to limit both the vibrations and the noise from the airflow generator 1.

[0047] The motor support 22, the stator, 24 the rotor 26 and the deflector 23 are coaxial around a longitudinal axis X.

[0048] It is nevertheless quite possible to imagine other embodiments of the airflow generator 1, in particular in which the deflector 23 is in one piece and attached to the motor support 22 by elastic pads.

[0049] Referring to Figures 2 and 3, the motor support 22 further comprises at least one cooling channel 73 disposed on the second face 22b of the motor support 22, bypassing the internal structure 221.

[0050] The cooling channel 73 can be formed within the thickness of the motor support 22, thus creating a recess in the second face 22b of the motor support 22. In the example illustrated in Figures 2 and 3, the cooling channel 73 has a general "U" shape and comprises two branches 73a, 73b passing on either side of the internal structure 221. The cooling channel 73 is thus delimited by an internal wall formed by the internal structure 221 on one side and on the other side an external wall projecting from the second face 22b of the motor support 22.

[0051] An airflow for cooling the motor and / or the control module 34 is intended to circulate in the cooling channel 73. For this purpose, the cooling channel 73 has at least one air inlet 74 and at least one air outlet 75 between which the airflow can circulate. The air inlet 74 and the air outlet 75 may, in particular, be arranged at opposite ends of the cooling channel 73.

[0052] As illustrated in [Fig. 4], the air inlet 74 is provided by at least one first orifice 225 formed in the engine mount 22. More specifically, this first orifice 225 may be formed in the edge of the engine mount 22 and open laterally. The air inlet 74 may also extend and pass through the deflector 23. For this purpose, the deflector 23 also has a second orifice 235 arranged opposite the first orifice 225. This second orifice 235 may, in particular, be formed in the outer portion 23b of the deflector 23.

[0053] As shown in Figures 4 to 6, the engine mount 22 further includes an elastomer tip 25 located at the end of the first orifice 225 opposite the cooling channel 73. This elastomer tip 25 borders the first orifice 225 and provides a sealed fluid connection between the first orifice 225 of the engine mount 22 and the second orifice 235 of the deflector 23. The fact that the fluid connection is sealed helps prevent air leaks and thus limits potential wind noise and whistling. This elastomer tip, by virtue of its elastic nature, also provides vibration absorption.

[0054] The elastomer tip 25 can have a length between 2.5mm and 4mm, preferably between 3mm and 3.5mm, corresponding in particular to the distance between the motor support 22 and the deflector 23. This length allows good absorption of vibrations between these 2 parts.

[0055] The elastomer tip 25 is more particularly compressed between the motor support 22 and the deflector 23 so as to ensure a sealed fluidic continuity between the first 225 and the second 235 orifice without the need for an additional glue or seal.

[0056] The elastomer tip 25 can in particular be overmolded at the end of the first orifice 225. The elastomer tip 25 can in particular be made of polystyrene-b-poly(ethylene-butylene)-b-polystyrene (SEBS).

[0057] The end of the first orifice 225 may also include a conduit 226 projecting opposite the cooling channel 73. The elastomer tip 25 is then disposed at the end of said conduit 226.

[0058] The elastomer tip 25 may more particularly comprise a hollow body 251 forming a conduit extending from the first orifice 225 and a lip 252 extending substantially perpendicularly to the axis of elongation of the body 251. This lip 252 is in particular continuous and extends over the entire circumference of the end of the body 251 opposite the first orifice 225. This lip 252 makes it possible in particular to have a sufficiently large contact surface with the deflector 23 in order to ensure sealing.

[0059] The lip 252 may, for example, have a thickness of between 0.5 mm and 1.5 mm, preferably 1 mm. The lip may also have a height of between 2.5 mm and 4 mm, preferably between 3 mm and 3.5 mm. This height and the thickness of the lip 252 can of course vary depending on the overall size of the airflow generator 1.

[0060] As illustrated in [Fig.5], the first orifice 225 and the body 251 of the elastomer tip 25 may in particular have an oblong profile.

[0061] The elastomer tip 25 may also include at least one reinforcing rib 253 (visible in [Fig. 6]) between the body 251 and the lip 252. In the example shown in [Fig. 6], with an oblong elastomer tip 25, the latter has three reinforcing ribs 253 on its long edges. The short edges of the oblong elastomer tip 25 may also include a reinforcing rib 253, depending on the size of the elastomer tip 25.

[0062] In order to conform to the shape of the deflector 23 on which it is compressed and thus have equivalent contact all around the elastomer tip 25, the lip 252 may in particular be concave.

[0063] Returning to [Fig. 4], the first face 22a of the motor support 22 may further comprise a first wall 227 projecting towards the portion of the deflector 23 covering said first face 22a. This first wall 227 delimits an enclosure around the stator 24. Additionally, this portion of the deflector 23 may comprise a second wall 237 projecting towards the first face 22a of the motor support 22. An elastomeric sealing lip 27 is disposed between said first 227 and second 237 walls in order to limit the risk of dust and / or water reaching the electronic control block 3.

[0064] This elastomeric lip 27 can, in particular, be overmolded onto the end of one of the first 227 or second 237 walls. The elastomeric lip 27 can be made of polystyrene-β-poly(ethylene-butylene)-β-polystyrene (SEBS). In the example illustrated in [Fig. 4], the elastomeric lip 27 is formed at the end of the first wall 227 of the motor support 22.

[0065] Referring back to Figures 2 and 3, at least one air outlet 75 of the cooling channel 73 can be provided by at least one opening formed in the engine mount 22 and opening onto the first face 23a. The airflow F is thus expelled between the deflector 23 and the first face 22a of the engine mount 22.

[0066] The cooling channel 73 is further covered by the metal plate 32 in a sealed manner so that the airflow only circulates between at least one air inlet 74 and at least one air outlet 75.

[0067] In the example illustrated in figures 2 and 3, the cooling channel 73 thus includes an air inlet 74 arranged on the base of the "U" and an air outlet 75 at the end of each of the branches 73a, 73b.

[0068] As illustrated in Figures 2 and 3, the internal structure 221 may have a projection 76 arranged opposite the air inlet 74. This projection 76 extends from the internal structure 221 in the direction of the air inlet 74. In particular, the projection 76 extends radially with respect to the longitudinal axis X.

[0069] The projection 76 may have two opposite sides, so that the airflow F from the air inlet 74 is separated into at least two fractions intended to circulate in each branch 73a, 73b of the cooling channel 73. Each fraction of airflow can thus follow a flow circuit distinct from the other fraction of airflow.

[0070] The projection 76 may have an end 77, for example rounded, arranged opposite a median or substantially median area of ​​the air inlet 74. Thus, the two fractions of air flow F can be distributed in the two branches 73a, 73b in equal or substantially equal proportions.

[0071] The projection 76 may have an evolving shape. For example, the projection 76 may have a shape that tapers towards the air inlet 74. The end 77 of the projection 76 is therefore tapered relative to the rest of the projection 76.

[0072] Referring also to [Fig. 3], the projection 76, for example, has two lateral surfaces 78 extending on either side of the end 77 of the projection 76 and each oriented towards a branch 73a, 73b of the cooling channel 73. These lateral surfaces 78 may, in particular, be concave. The concavity of these surfaces 78 is oriented towards the branch 73a, 73b of the cooling channel 73 towards which it is directed. In other words, the sides of the projection 76 may be curved, rounded.

[0073] Each concave lateral surface 78 (or draft) can describe an arc of a circle of at least 5°. By way of particular and non-limiting example, the concave lateral surface 78 can extend over a distance of at least 10mm.

[0074] Such lateral surfaces 78 make it possible to reduce the speed of the incoming airflow and to guide the airflow towards the interior of the cooling channel 73 without creating turbulence, thus facilitating the flow of the airflow fractions F on either side of the projection 76.

[0075] In the example illustrated in figures 2 and 3, the projection 76 defines a general shape of water droplet or close to the shape of a water droplet.

[0076] The cooling channel 73 has a depth, along the axis A of the base 73, which is advantageously decreasing between the air inlet 74 and the air outlet 75. The depth of the cooling channel 73 decreases, for example, continuously.

[0077] In this case, the depth of the recess forming the cooling channel 73 varies, in particular decreases, between the air inlet 74 and the air outlet 75. The depth at the air inlet 74 is greater than the depth at the air outlet 75. The bottom of the cooling channel 73 thus forms an inclined plane with respect to the plane defined by the engine support 22. This difference in depth generates a venturi effect and improves the flow of the airflow F.

[0078] Furthermore, during operation, turbulence zones were observed to appear during the flow of air in the cooling channel 73. Referring again to Figures 2 and 3, the engine mount 22 may have at least one assembly element 19, for example at least one boss, extending from the bottom wall of the engine mount 22. The boss(es) are, for example, provided for assembling the engine mount 22 with another part of the airflow generator 1, such as the metal plate 32. Such bosses may generate at least some of the turbulence zones for the airflow F.

[0079] At least one orifice 71, 72 is advantageously provided in the bottom of the cooling channel 73 so as to be through and to open onto the first face 22a of the engine support 22.

[0080] One or more orifices, hereinafter referred to as first orifices 71, are provided to limit turbulence. They are advantageously positioned according to the turbulence zones. The orifices 71 can be placed ideally at the center of the vortex or at a distance less than or equal to 5 mm from the center of the vortex. For example, at least one first orifice 71 is provided near the assembly element 19, such as the boss.

[0081] In the illustrated example, at least two first holes 71 are provided around the assembly element 19. The first two holes 71 can be arranged symmetrically on either side of the assembly element 19.

[0082] The assembly elements 19 such as the bosses and the first associated orifices 71 can be located on the outer periphery of the cooling channel 73, i.e. opposite the internal structure 221.

[0083] In addition or as an alternative, at least one orifice 72 may be provided in the bottom of the cooling channel 73, near the air outlet 75. To differentiate it from the first orifices 71 described previously, this orifice is hereafter referred to as the second orifice 72. Such a second orifice 72 may optionally be provided in the absence of first orifices 71. The second orifice 72 makes it possible to change, and in particular to reduce, the speed of the airflow passing through the cooling channel 73.

[0084] The second orifice(s) 72 can be placed at most 20mm from the air outlet 75. They can be placed on the external / internal periphery of the cooling channel 73 or in the center in order to best help guide the airflow.

[0085] Thus, the motor support 22 as described above makes it possible to improve the overall cooling performance in particular of the metal plate 32 and therefore of the control module 34 and the power supply.

[0086] Indeed, the engine mount 22 defines a specific air channel 73 for the cooling function, and the inlet projection 76 separates the airflow F intended to circulate in this channel. This projection 76 generates turbulence. and to increase the speed of the airflow F. In addition, the inclined bottom of the cooling channel 73 improves the flow of the airflow F from the air inlet 74 to the air outlet 75.

Claims

1. Demands Airflow generator (1) for an airflow generator (1) of a heating, ventilation and / or air conditioning device of a motor vehicle comprising an engine mount (22), the engine mount (22) comprising: - a first face (22a) configured for the attachment of a stator (24), and - a second face (22b), opposite the first face (22a), comprising a cooling channel (73) through which an airflow is intended to circulate for cooling the stator (24) and / or a control module (34) of the airflow generator (1) intended to be fixed to the motor support (22), said cooling channel (73) bypassing the internal structure (221), the cooling channel (73) having at least one air inlet (74) and at least one air outlet (75), the air inlet (74) having a first orifice (225) formed in the motor support (22), characterized in that the motor support (22) further comprises an elastomer tip (25) disposed at the end of the first orifice (225) opposite the cooling channel (73), said elastomer tip (25) bordering said first orifice (225), said airflow generator (1) comprising a deflector (23) covering at least partially the first face (22a) of the motor mount (22),said deflector (23) having a second orifice (235) disposed opposite the first orifice (225) of the motor support (22), the elastomer tip (25) being compressed between the motor support (22) and the deflector (23) so as to ensure a sealed fluid continuity between the first (225) and the second (235) orifice, the first face (22a) of the motor support (22) having a first wall (227), said first wall (227) projecting towards the portion of the deflector (23) covering said first face (22a), said first wall (227) defining an enclosure around the stator (24), and said portion of the deflector (23) having a second wall (237) projecting towards the first face (22a) of the motor support (22), a sealing elastomer lip (27) being disposed between said first (227) and second (237) walls.,

2. Airflow generator (1) according to the preceding claim, characterized in that the elastomer lip (27) is overmolded to the end of one of the first (227) or second (237) walls.

3. Airflow generator (1) according to claim 1 or 2, characterized in that the elastomer tip (25) is overmolded to the end of the first orifice (225).

4. Airflow generator (1) according to any one of the preceding claims, characterized in that the end of the first orifice (225) has a conduit (226) projecting opposite the cooling channel (73), the elastomer tip (25) being disposed at the end of said conduit (226).

5. Airflow generator (1) according to any one of the preceding claims, characterized in that the elastomer nozzle (25) comprises a hollow body (251) forming a conduit extending from the first orifice (225) and a lip (252) extending substantially perpendicularly to the elongation axis of the body (251) around the entire circumference of the end of the body (251) opposite the first orifice (225).

6. Airflow generator (1) according to the preceding claim, characterized in that the first orifice (225) and the body (251) of the elastomer nozzle (25) have an oblong profile.

7. Airflow generator (1) claim 5 or 6, characterized in that the elastomer tip (25) has at least one reinforcing rib (253) between the body (251) and the lip (252).

8. Airflow generator (1) according to any one of claims 5 to 7, characterized in that the lip (252) is concave.

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