JP2019529226A - Intake housing and corresponding motor vehicle heating, ventilation and / or air conditioning system - Google Patents

Abstract

The present invention includes at least one inlet, at least one outlet (21), and a spiral chamber (17), and the spiral chamber (17) is an impeller of an electric fan unit. Particularly adapted for motor vehicles, which are configured to receive an impeller configured to draw an air flow from the mouth and have a profile that starts from the spiral chamber nose (19) and extends to the outlet (21) It relates to an intake housing (1) for heating, ventilation and / or air conditioning. According to the invention, the intake housing (1) further comprises at least one deflector (29) extending from the spiral chamber nose (19) as a continuation of the wall (18) of the spiral chamber (17), 29) has a tapered shape. The invention also relates to a heating, ventilation and / or air conditioning device comprising such an intake housing (1).

Description

  The field of the invention is ventilation, heating and / or air conditioning. The invention particularly relates to an intake housing for such a device.

  In the automotive field, it is common to provide a vehicle with ventilation, heating and / or air conditioning so that the air heat parameter of the air in the vehicle cabin is controlled by distributing air to the vehicle cabin.

  Such a device includes an intake housing provided with an inlet, also known as an air inlet, to allow at least one air flow into the intake housing. The airflow can be an external airflow from outside the vehicle cabin or a recirculated airflow from inside the vehicle cabin.

  The heating, ventilation and / or air conditioning apparatus also includes an electric fan unit, also known as a blower. The electric fan unit includes, in particular, a fan impeller installed in a spiral chamber of the intake housing, and an electric motor designed to suck the air flow from the intake port of the intake housing by rotating the fan impeller. A fan impeller disposed in the vortex chamber allows air to flow from the corresponding inlet regardless of whether the air flow is from the outside or recirculated.

  As is well known, the vortex chamber of the intake housing is contoured starting from the vortex chamber nose and is typically aeraulic with one or more heat treatment devices of heating, ventilation and / or air conditioning units. It has a contour that develops (changes) to the communicating outlet. The air flowing out from the intake housing first passes through the spiral chamber, and then passes through the heat treatment device, and is discharged into the vehicle cabin. More specifically, the intake housing has a ferrule that forms an intake opening for air flow from any one of the intake ports of the intake housing. The suction opening is in pneumatic communication with the housing in which the fan impeller is installed.

  According to the known solution, a space exists between this ferrule of the intake housing and the fan impeller installed in the spiral chamber.

  The operation of the fan impeller and the motor and / or the air flow induced by the fan impeller generates vibrations. Such vibration causes unnecessary noise and vibration that propagates through the duct and the structural elements of the vehicle into the vehicle interior, and causes noise for passengers.

  The unwanted noise caused is due to the nature of the air flow entering the intake housing. That is, it depends on whether the air flow flowing into the intake housing is a recirculation air flow or an external air flow. Accordingly, the first unnecessary noise is generated when the external air flow flows into the intake housing, and the second unnecessary noise is generated when the recirculated air flow flows into the intake housing.

  In particular, the first unwanted noise that occurs in the outside air supply mode may be greater than the second unwanted noise that occurs in the recirculation air supply mode. This is because suction exists in the radial direction so that there is a space between the ferrule of the intake housing that forms the inlet for the air flow and the fan impeller, and the air flows through the fan impeller toward the outlet. This is because the air flow tends to pass back through the fan impeller without going to the outlet of the intake housing. In fact, due to the back pressure in the recirculation airflow circuit, the pressure that the blower should overcome is lower than the pressure of the outside air.

  Therefore, particularly when the heating, ventilation, and / or air conditioner switches from the supply mode that uses the recirculated air taken out from the passenger compartment to the outside air supply mode, the sound of the first unnecessary noise and the second unnecessary noise is generated. The difference can be perceived by the person on board. This can cause discomfort.

  A known solution is to attach an acoustic mask or screen to the intake housing at the air intake opening of the intake housing where the air flow is drawn. However, this solution reduces the air intake opening of the intake housing and increases the pressure loss.

  Therefore, the present invention proposes an air intake housing intended to reduce unwanted noise generated by the operation of a fan impeller installed in the air intake housing, in particular a ventilation, heating and / or air conditioning device for motor vehicles. It is intended to at least partially overcome these problems in the prior art.

  Another object of the invention is to propose a heating, ventilation and / or air conditioning system for a motor vehicle comprising such an intake housing.

For this purpose, the present invention
-At least one inlet,
-At least one outlet,
-A vortex chamber;
With
The vortex chamber is an impeller of an electric fan unit and is designed to receive an impeller designed to suck an air flow from a suction port and start from the vortex chamber nose With a contour that extends to the mouth,
In particular, it relates to an intake housing for heating, ventilation and / or air conditioning equipment of motor vehicles.

According to the present invention,
The intake housing further comprises at least one deflector extending from the vortex chamber nose to the wall of the vortex chamber;
The deflector has a tapered shape;

  Such a deflector prevents the air flow discharged so as to flow toward the outlet after being sucked by the fan impeller from flowing backward to the fan impeller. Furthermore, the placement of the deflector does not cause an additional pressure drop.

The intake housing may have any one of the following features, either separately or in combination.
The deflector is at least partially substantially curved, and the deflector preferably has a substantially hyperbolic shape;
The deflector is reduced in height from the spiral chamber nose;
The maximum height of the deflector is approximately 15 mm to 25 mm;
-The deflector is
A first side surface extending the first side wall of the spiral chamber, the first side surface being intended to face the impeller;
A second side extending from the second side wall of the spiral chamber and defining the outlet;
A connecting surface that joins the first side surface and the second side surface;
Have
The vortex chamber defines a substantially spiral shape starting from the vortex chamber nose, and the first side surface of the deflector has an upper edge defining a semicircle extending the spiral shape; .
The first and second side surfaces are substantially curved lower edges, each having a lower edge having a substantially hyperbolic shape, for example.
The connecting surface is substantially curved, for example substantially hyperbolic.
The second side surface extends in a direction crossing the direction of the first side surface;
The width of the connecting surface decreases from the spiral chamber nose, for example, the connecting surface is shaped to end at a point;
The deflector is made from a single component integral with the intake housing or is mounted on the volute chamber of the intake housing.
The deflector extends over a length of 40 mm to 60 mm.

  The present invention is also the above-described at least one intake housing and an impeller installed in the spiral chamber of the intake housing, and is designed to suck an air flow from a suction port of the intake housing. An electric fan unit including an impeller, and a heating, ventilation and / or air conditioning apparatus for a motor vehicle.

A heating, ventilation and / or air conditioning device for a motor vehicle may have any one of the following features individually or in combination.
The intake housing has a ferrule that forms a suction opening for the air flow sucked by the impeller;
The impeller has a plurality of blades joined at one end by connecting strips.
The deflector decreases in height between the ferrule and the connection strip from a maximum height at least partially covering the connection strip to a minimum height;
The deflector covers at least half of the height of the connecting strip at its maximum height;
The impeller has a closed wall, for example a substantially bowl-shaped wall;
The blade of the impeller emerges from the periphery of the substantially bowl-shaped part;
The connecting strip is arranged on the opposite side of the closing wall;

  Other features and advantages of the present invention will become more apparent from the following description and accompanying drawings, which are given by way of non-limiting example.

1 is a perspective view of an intake housing according to the present invention including a fan impeller. FIG. FIG. 2 is a cross-sectional view of the intake housing of FIG. 1 including a fan impeller, schematically showing an air deflector. Fig. 2b is a schematic enlarged view of a deflector of the intake housing of Fig. 2a. 2 is a bottom cross-sectional view showing a vortex chamber of the intake housing of FIGS. The 1st perspective view which shows the deflector which extends the wall of a vortex chamber. The 2nd perspective view which shows the deflector which extends the wall of a spiral chamber. FIG. 5 is another schematic diagram illustrating a deflector arranged to extend a spiral chamber that houses a fan impeller. The figure which compares the noise level of the fan impeller in operation | movement installed in the intake housing by a prior art with the noise level of the fan impeller in operation | movement installed in the intake housing by this invention.

  In these figures, identical elements are indicated using the same reference numerals.

  The following embodiments are exemplary. Although reference is made to one or more embodiments, this does not necessarily mean that each reference refers to the same embodiment or that a feature applies to only one embodiment. Also, individual features of different embodiments can be combined or exchanged to provide other embodiments.

  Certain elements in the detailed description may be numbered as, for example, a first (or) wall, a second (or) wall, or a first (or) surface, a second (or) surface. In this case, such numbering is only intended to distinguish and identify elements that are similar but not identical. This numbering does not imply that one element is preferred over another, and such descriptions are simply interchangeable without departing from the scope of the present invention.

  FIG. 1 is a schematic view of a part of a heating, ventilation and / or air conditioning apparatus provided in a motor vehicle. The heating, ventilation and / or air conditioning apparatus includes an intake housing 1 partially shown in FIGS. 1 and 2a and an electric fan unit 3 also known as a blower. Accordingly, the intake housing 1 is designed to accommodate the electric fan unit 3.

  The assembly comprising the intake housing 1 and the corresponding electric fan unit 3 can also form an air propulsion device for heating, ventilation and / or air conditioning.

  The electric fan unit 3 is designed to be mounted on the intake housing 1 to generate an air flow. The air flow may be an external air flow drawn from outside the vehicle cabin, an air flow drawn from inside the vehicle cabin known as a recirculation or recycle air flow, or even It may be a mixture of an external air stream and a recirculated air stream. In operation, the electric fan unit 3 mounted on the intake housing 1 guides the air flow to a heating (ventilation) and / or air conditioning duct (not shown), which duct directs the air flow to an outlet (not shown). Distribute it and send it to the vehicle compartment.

  For this purpose, the electric fan unit 3 has a motor 5 and an impeller 7. The impeller 7, also known as a fan impeller or blower impeller, is designed to be driven by the motor 5 to ensure the movement of the air flow. The motor 5 is designed to rotationally drive the fine impeller 7 about the rotation axis A.

  The fan impeller 7 has a cylindrical shape as a whole and has an open surface. The fan impeller 7 has an upper peripheral edge 8 that defines this open surface of the fan impeller 7. The fan impeller 7 sucks the air flow through this open surface as schematically indicated by the arrow F1 in FIG. 1, and then the air flow is laterally indicated as schematically indicated by the arrow F2 in FIG. In other words, it is designed to discharge in the radial direction with respect to the rotation axis A.

  According to the embodiment shown in FIG. 1, the fan impeller 7 also has a closing wall or part 9 that forms the back of the fan impeller 7. The wall is, for example, substantially bowl-shaped. This portion 9 is hereinafter referred to as bowl 9. The bowl is substantially convex, and the convex direction faces the inside of the fan impeller 7. The bowl 9 is disposed on the opposite side of the open surface of the fan impeller 7 and the upper peripheral edge 8.

  The fan impeller 7 has a hub 11. In this example, the hub 11 is located substantially in the center of the bowl 9 and, as schematically shown in FIG. 2 a, the transmission shaft of the motor 5 so as to mechanically connect the fan impeller 7 to the motor 5. Designed to accept the free end.

  The fan impeller 7 may have a plurality of blades 13 or fins. In this example, the blade 13 extends from the periphery of the bowl 9 in a direction substantially parallel to the rotation axis A. Therefore, these blades 13 emerge from the peripheral edge of the bowl 9. In other words, according to the embodiment shown in FIGS. 1 and 2 a, the blade 13 extends in a direction away from the peripheral edge of the bowl 9 in the longitudinal direction. Furthermore, on the opposite side of the bowl 9, the blade 13 is joined at its free end by a connection strip 15. Therefore, the connection strip 15 exists on the open surface of the fan impeller 7 and the upper peripheral edge 8 side.

  The intake housing 1 will be described in more detail below.

  The intake housing 1 has at least one inlet (not shown), in particular at least one outside air inlet (not shown). The outside air intake allows an outside air flow, also known as fresh air, to flow into the intake housing 1 from the outside of the passenger compartment. In a variant or supplement, this may be a recirculation or recycle air intake that allows a recirculation air stream taken from the passenger compartment into the intake housing.

  As shown in FIG. 1, the intake housing 17 has a spiral chamber 17 that is designed so that the electric fan unit 3 is mounted therein, whereby the air flow generated by the electric fan unit 3 is guided. It is burned.

  In this example, the vortex chamber 17 is substantially helical. The contour of the vortex chamber 17 starts from a zone known as a “vortex chamber nose” 19. The spiral chamber nose 19 can also be defined as a region facing the internal space of the intake housing 1 or a region that pierces the internal space. The spiral shape of the spiral chamber 17 develops (deploys) from the spiral chamber nose 19 to the air outlet 21 of the intake housing 1.

  In other words, the vortex chamber 17 has a first side wall 18 that follows a spiral shape starting from the vortex chamber nose 19 and ending by defining the outlet 21. This is the inner wall 18 of the vortex chamber 17, ie the inner wall 18 on the side of the inner volume defined by the vortex chamber 17.

  The vortex chamber 17 is a second side wall 20 on the other side of the vortex chamber nose 19 with respect to the first side wall 18, and defines an outlet 21 in cooperation with an end portion of the first side wall 18. A second side wall 20 is provided.

  In the illustrated example, an element 22 such as a heat treatment apparatus, specifically a heat exchanger, can be disposed at the outlet 21.

  In order to accommodate the fan impeller 7, the spiral chamber 17 defines a housing 23 in which the fan impeller 7 can be installed. The housing 23 is centered on the rotation axis A, for example. The first side wall 18 of the vortex chamber 17 delimits the housing 23. Therefore, when the fan impeller is installed inside the spiral chamber 17, the first side wall 18 faces the fan impeller 7.

  Further, the intake housing 1 is an air intake that allows pneumatic communication between the housing 23 and one or more intake ports (not shown) of the intake housing 1, such as outside air or recirculation air intakes. An opening 25 is provided.

  In this example, the fan impeller 7 has a connection strip 15 that joins the blades 13 to the air suction opening 25 side, in particular, so that the bowl 9 is on the opposite side of the air suction opening 25 and the open surface of the fan impeller 7. As such, it is designed to be installed in the housing 23. Accordingly, the intake housing 1 has an open air intake surface. When the fan impeller 7 accommodated in the vortex chamber 17 is driven to rotate, the air flow sucked through the air suction surface, that is, through the air suction opening 25, and passed through the fan impeller 7, It flows out from the housing 1 through the blower outlet 21 connected to the duct (not shown) of heating, ventilation, and / or an air conditioner, for example.

  The surface of the intake housing 1 opposite to the air intake surface including the air intake opening 25 is normally closed by the motor support portion of the electric fan unit 3.

  Further, the intake housing 1 may have a ferrule 27 that defines an air intake opening 25. Further, as schematically shown in FIG. 2 a, there is usually a space between the upper peripheral edge 8 of the fan impeller 7 and the ferrule 27 of the intake housing 1.

  The intake housing 1 has at least one deflector 29. This is shown schematically in FIGS. 2a and 2b and better shown in FIGS.

  The deflector 29 is arranged so as to deflect the air flow and guide it to the outlet 21. More specifically, in the deflector 29, the air flow sucked by the fan impeller 7 and discharged in the radial direction flows back to the fan impeller 7 because there is a space between the ferrule 27 and the upper peripheral edge 8 of the impeller. Arranged to prevent this.

  For this purpose, the deflector 29 is arranged close to the spiral chamber nose 19. More specifically, the deflector 29 extends at or from the spiral chamber nose 19 to extend the wall of the spiral chamber 17. Referring to FIG. 1, the deflector 29 extends the first side wall 18 of the spiral chamber 17. The first side wall 18 is a wall tangent to the fan impeller 7 when the impeller is disposed in the spiral chamber 17.

  More specifically, according to the described embodiment, the deflector 29 has an evolving shape. In other words, the shape of the deflector 29 develops or changes between the spiral chamber nose 19 and one end 31 of the deflector 29 on the opposite side of the spiral chamber nose 19. Therefore, the shape of the deflector 29 is not constant.

  The evolution of the shape of the deflector 29 is, for example, a gradual progression, as opposed to one or more sudden shape changes. For example, this development is a reduction in the size of the deflector 29. Preferably, the deflector 29 has a tapered (tapered) shape, such as a pointed shape. In particular, the deflector 29 has the widest part at the spiral chamber nose 19 and the narrowest part or the sharpest part at the end 31 of the deflector 29.

  In particular, the width of the deflector 29 decreases between the spiral chamber nose 19 and the end 31.

  Further, according to the illustrated embodiment, the height h of the deflector 29 decreases from the spiral chamber nose 19. In other words, the deflector 29 has a maximum height at the spiral chamber nose 19 and a minimum height at the opposite end 31 of the spiral chamber nose 19.

  According to the embodiment shown in FIG. 2 a, the deflector 29 extends between the ferrule 27 and the connection strip 15. Where the deflector 29 has a maximum height, the deflector 29 at least partially covers the connection strip 15 and preferably covers at least half of the height of the connection strip 15. As a non-limiting example, the maximum height is approximately 15 mm to 25 mm. Therefore, the deflector 29 extends over a short distance and does not hide the blade 13 of the fan impeller 7. For this reason, the deflector 29 is not an obstacle that can prevent the fan impeller 7 from correctly sucking and discharging the air flow.

  Furthermore, considering the arrangement of the elements in FIG. 2 a, the deflector 29 is arranged only in the upper part of the vortex chamber 17.

  Still referring to FIGS. 2b and 3, the deflector 29 extends over a length l. This length l is sufficient to allow an efficient deflection of the air flow that can be re-sucked by the fan impeller 7 without disturbing the flow of air flow to the outlet 21. . Advantageously, the deflector 29 extends over a length l (el) of 40 mm to 60 mm.

  Further, the deflector 29 is at least partially substantially curved, and preferably has a substantially hyperbolic shape.

  Preferably, the shape of the deflector 29 is designed to continue the spiral-shaped curvature of the vortex chamber 17 on the side that can be referred to as the inside of the deflector 29 facing the housing 23 that receives the fan impeller 7. . On the opposite side, which can be referred to as the outside of the deflector 29, the shape of the deflector 29 is advantageously designed to guide the air flow towards the outlet 21.

In particular, referring to FIGS. 3, 4a and 4b, according to the illustrated embodiment, the deflector 29 is
A first side 291 extending the first side wall 18 of the volute chamber 17 and facing the housing and thus intended to face the fan impeller 7;
-A second side 292 extending from the second side wall 20 of the vortex chamber 17 and defining the outlet 21;
-A connecting surface 293 for joining the first side surface 291 and the second side surface 292;
including.

  The first side surface 291 has an upper edge portion 291a and a lower edge portion 291b. Similarly, the second side surface 292 has an upper edge portion 292a and a lower edge portion 292b. Here, the terms “upper” and “lower” are used based on the element arrangement shown in FIGS. 1, 2 a and 5. Upper edges 291 a and 292 a of the first and second side surfaces 291 and 292 are on the ferrule 27. Lower edges 291 b and 292 b of the first and second side surfaces 291 and 292 are on the opposite side of the ferrule 27.

  Further, according to the described embodiment in which the vortex chamber 17 defines a substantially helical shape, the upper edge 291a (FIG. 4a) of the first side 291 defines an arc extending the helical shape. Therefore, the upper edge portion 291a of the first side surface 291 is curved.

  Furthermore, the lower edge portion 291b of the first side surface 291 is substantially curved, for example, has a substantially hyperbolic shape. The lower edge portion 291 b of the first side surface 291 is at the joint with the connecting surface 293.

  The second side 292 (FIG. 4 b) is arranged at the end 31 of the deflector 29 so as to be connected to the second side wall 20 of the spiral chamber 17 that defines the outlet 21.

  More specifically, according to the illustrated embodiment, the first side 291 extends in a certain extending direction, in this example substantially circular, and the second side 292 extends in the direction in which the first side 291 extends. Extend in the intersecting direction. Therefore, in the present example, the upper edge 292a of the second side surface 292 extends in a direction intersecting with the arc in which the upper edge 291a of the first side surface 291 extends.

  Similar to the first side 291, the upper edge 292 b of the second side 292 is also substantially curved, and has a substantially hyperbolic shape according to the illustrated embodiment. The lower edge portion 292 b of the second side surface 292 is also at the joint portion of the connecting surface 293.

  Accordingly, the side edges of the connecting surface 293 that join the inner side and the outer side, that is, the two side surfaces 291 and 292 of the deflector 29, are substantially hyperbolic according to the illustrated embodiment. Generally, this causes the connecting surface 293 to have a substantially hyperbolic shape.

  Furthermore, the width of the connecting surface 293 shown in FIGS. 3 to 4 b decreases from the spiral chamber nose 19. In other words, the connecting surface 293 has a shape that terminates at a point. This point is the end 31 of the deflector 29. Further, the deflector 29 can be manufactured as a single component integrated with the intake housing 1. Alternatively, as a modification, the deflector 29 can be a component that is mounted in the spiral chamber 17 by, for example, overmolding.

  Finally, when the impeller is installed in the housing 23 of the intake housing 1 so as to prevent turbulence of the air flow during operation of the fan impeller 7, the deflector 29 is advantageously arranged from the outer peripheral edge of the fan impeller 7. It is arranged with a distance of about 3 mm to 4 mm.

  The air deflector 29 having the developed shape, more specifically the tapered shape as described above, and arranged so as to extend the spiral chamber nose 19, regenerates the air flow blown toward the fan impeller 7. Prevent circulation, thereby reducing unwanted noise associated with heating, ventilation and / or use of air conditioners.

  This is modeled by the graph of FIG. FIG. 6 is an acoustic measurement of noise generated during operation of the fan impeller 7 installed in the intake housing 1, and the deflector 29 according to the present invention exists for a predetermined air flow velocity induced by the fan impeller 7. The acoustic measurements are shown with and without cases. Thus, graph 6 shows the noise level variation in decibel A on the Y axis (dB (A) on the Y axis and as a function of the audible frequency in Hertz (Hz) on the X axis. More specifically, Graph 6 relates to acoustic measurements at frequencies that are audible to humans, ie, in the range of 20 Hz to 20 kHz.

  In the graph of FIG. 6, the continuous curve C1 is an acoustic measurement value not using the present invention, and the dotted curve C2 is an acoustic measurement value using the present invention.

  As shown, the present invention provides a reduction in acoustic gain, i.e. noise level, in the frequency band from 80 Hz to 200 Hz. In fact, in this frequency band, the noise level (curve C2) perceived in the operation of the fan impeller 7 installed in the spiral chamber 17 having the deflector 29 according to the present invention is according to the prior art without such a deflector 29. It is lower than the noise level (curve C1) perceived in the operation of the fan impeller 7 installed in the vortex chamber 17. Such an acoustic gain can be greater than 10 dB (A), for example, can reach 12 dB (A) for frequencies close to 100 Hz. Such a fall helps to reduce the acoustic discomfort felt by the human ear.

Furthermore, the inventors have measured a reduction in pneumatic loss close to 75% according to the present invention. In fact, in a solution with a prior art vortex chamber 17 without a deflector 29 having an evolutionary shape and having an acoustic mask at the air inlet opening, the amount of pneumatic loss can reach 20 m ³ / h. On the other hand, if the intake housing 1 according to the present invention is used in which the spiral chamber 17 has a deflector 29 having a developed shape arranged as described above, the amount of pneumatic loss is reduced to 5 m ³ / h. To do.

  Compared to prior art solutions where the spiral chamber containing the fan impeller does not have such a deflector 29, the progressive or evolutionary air deflector 29 according to the invention limits the recirculation of the air flow. This reduces air pressure / fluid pressure loss and undesirable noise associated with the use of heating, ventilation and / or air conditioning equipment.

  Accordingly, the deflector 29 forms a chicane that counteracts the tendency of the airflow to flow back through the space between the ferrule 27 of the intake housing 1 and the upper peripheral edge 8 of the fan impeller 7.

  Furthermore, its tapered shape does not hinder and in itself does not cause additional pneumatic losses. In particular, the hyperbola shape of the connecting surface 293 that joins the two side surfaces 291 and 292 of the deflector 29 has no trouble that causes only a minimal pneumatic loss, but is effective for unnecessary noise generated by the fan impeller 7. This is an acoustic compromise solution that can be reduced.

Claims (12)

An intake housing (1), in particular for heating, ventilation and / or air conditioning of motor vehicles,
-At least one inlet,
-At least one outlet (21);
-A vortex chamber (17);
With
Said vortex chamber (17) is:
The impeller (7) of the electric fan unit (3), which is designed to accommodate the impeller (7) designed to suck the airflow from the inlet;
-Having a contour that starts from the spiral chamber nose (19) and extends to the outlet (21);
The intake housing (1) further comprises at least one deflector (29) extending from the spiral chamber nose (19) to the wall (18) of the spiral chamber (17);
The deflector (29) has a tapered shape;
An intake housing (1) characterized in that   The intake housing (1) according to claim 1, wherein the deflector (29) is at least partially substantially curved, and the deflector (29) preferably has a substantially hyperbolic shape.   The intake housing (1) according to claim 1 or 2, wherein the deflector (29) decreases in height from the spiral chamber nose (19). The deflector (29)
A first side surface (291) extending the first side wall (18) of the vortex chamber (17) and intended to be arranged to face the impeller (7) ( 291),
A second side surface (292) extending from the second side wall (20) of the spiral chamber (17) and defining the outlet (21);
-A connecting surface (293) for joining the first side surface (291) and the second side surface (292);
The intake housing (1) according to any one of the preceding claims, comprising:   The vortex chamber (17) defines a substantially helical shape starting from the vortex chamber nose (19), and the first side (291) of the deflector (29) extends the helical shape. The intake housing (1) according to claim 4, having an upper edge (291a) defining a circular arc to be formed.   The first and second side surfaces (291, 292) are substantially curved lower edges (291b, 292b), for example, lower edges (291b, 292b) having a substantially hyperbolic shape, 6. Intake housing (1) according to claim 4 or 5, each having.   The intake housing (1) according to any one of claims 4 to 6, wherein the second side surface (292) extends in a direction crossing a direction in which the first side surface (291) extends.   The intake housing (1) according to claim 7, wherein the width of the connecting surface (293) decreases from the spiral chamber nose (19), for example, the connecting surface (293) is shaped to terminate at a point. ).   The deflector (29) is a part made of a single part integral with the intake housing (1) or a part attached to the spiral chamber (17) of the intake housing (1). An intake housing (1) according to any one of the preceding claims.   10. Intake housing (1) according to any one of the preceding claims, wherein the deflector (29) extends over a length (l) between 40mm and 60mm.   11. At least one intake housing (1) according to any one of claims 1 to 10, and an impeller (7) housed in the spiral chamber (17) of the intake housing (1). And an electric fan unit (3) having an impeller (7) designed to suck an air flow from a suction port of the intake housing (1), heating and ventilation for a motor vehicle, And / or air conditioner. The intake housing (1) has a ferrule (27) forming a suction opening (25) for the air flow sucked by the impeller (7);
The impeller (7) has a plurality of blades (13) joined at one end by connecting strips (15);
The deflector (29) is at least partially between the ferrule (27) and the connection strip (15), preferably from a maximum height that covers at least half of the height of the connection strip (15); , The height decreases to the minimum height,
The heating, ventilation and / or air conditioning apparatus according to claim 11.

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