Air outlet arrangement and motor vehicle having such an air outlet arrangement

Abstract

The invention relates to an air outlet arrangement having an air outlet (5), a curved air guide plate (8), wherein an air flow (6) is guided from the air outlet (5) along a convex surface (8A) of the air guide plate (8) using the Coandă effect, wherein the air guide plate (8) is porous, wherein the air guide plate (8) has a suction portion (8C) upstream and a subsequent pressure section (8D), further having a pressure difference generating device (12) for generating a suction air pressure along the suction portion (8C) on a concave surface (8B) such that air is drawn through the air guide plate (8) from the convex surface (8A) to the concave surface (8B), and a pressure air pressure along the pressure portion (8D) on the concave surface (8B) such that air is forced through the air guide plate (8) from the concave surface (8B) to the convex surface (8A).

Description

[0001] Air outlet arrangement and motor vehicle with such a

[0002] The invention relates to a motor vehicle with an air outlet arrangement for supplying fresh air and / or recirculated air into a vehicle passenger compartment. The air outlet arrangement has a curved air guide plate along which the supplied air is guided by means of the Coandé effect. Furthermore, the invention relates to a motor vehicle with such an air outlet arrangement.

[0003] From CN 115570946 A, an air outlet is already known that incorporates an air guide element utilizing the Coandé effect. The direction of the discharged airflow can be changed by adjusting the air guide element. However, since the Coandé effect also depends on the airflow velocity, the airflow is guided along the air guide element with varying degrees of effectiveness depending on the velocity and may break off at different points, making it difficult to predict the direction of the discharged airflow.

[0004] It is therefore an object of the present invention to at least partially eliminate the aforementioned disadvantages. This object is achieved by an air outlet arrangement according to claim 1 and a motor vehicle according to claim 5. Advantageous embodiments of the invention are the subject of the dependent claims.

[0005] 24-3403 According to an embodiment of the invention, an air outlet arrangement, in particular for a motor vehicle, is provided with at least one air outlet; at least one curved air guide plate, which is associated with the air outlet and which (if the air guide plate is retractable, at least in a fully extended state) is positioned relative to the air outlet such that an airflow exiting the air outlet is guided along a convex surface of the at least one air guide plate; wherein the air guide plate is porous oris air-permeable, so that air exchange between the convex surface and a concave surface is possible through the air guide plate; wherein the air guide plate has a suction section and a pressure section, which is further away from the air outlet than the suction section (if the air guide plate is retractable, at least in a fully extended state); furthermore with a pressure differential generating device for generating a suction air pressure along the suction section on the concave surface, so that air is drawn or can be drawn through the air guide plate from the convex surface to the concave surface, and a pressure air pressure along the pressure section on the concave surface, so that air is pushed or can be pushed through the air guide plate from the concave surface to the convex surface.The advantage of this embodiment is that the suction air pressure ensures that the airflow guided along the convex surface adheres well to it and is directed parallel to the convex surface. The separation of this guided airflow is selectively generated in the area of ​​pressure air pressure. In this way, the flow direction of an airflow emitted from the air guide plate can be predicted and adjusted very accurately.

[0006] According to a further embodiment of the invention, the pressure differential generating device is a fan. This would be a simple way to generate a suction air pressure and a pressure air pressure.

[0007] 24-3403For example, the fan could be a cross-flow fan, an axial fan or a radial fan.

[0008] According to a further embodiment of the invention, the concave surface of the suction section is connected (i.e., pneumatically connected) to a suction channel, which is connected (i.e., pneumatically connected) to a suction side of the differential pressure generating device, e.g., the fan, and the concave surface of the pressure section is connected (i.e., pneumatically connected) to a pressure channel, which is connected (i.e., pneumatically connected) to a pressure side of the differential pressure generating device, e.g., the fan. In particular, the pressure channel and the suction channel are channels that are open only on the suction side and pressure side, respectively, and on the concave surface, respectively, and are hermetically sealed off from the environment by closed walls in between.

[0009] According to a further embodiment of the invention, upstream of the air outlet, at least a portion of the incoming air is guided through a Venturi nozzle, so that the Venturi nozzle forms the pressure differential generating device. A suction side of the Venturi nozzle is connected to the concave surface of the suction section (i.e., pneumatically connected), and a pressure side of the Venturi nozzle is connected to the concave surface of the pressure section (i.e., pneumatically connected). The Venturi nozzle can be arranged in a duct upstream of the air outlet, with the pressure and suction ducts leading out of it. Alternatively, the Venturi nozzle can be arranged externally, for example, where the fan would be located, in which case the inlet and outlet of the Venturi nozzle would need to be connected to the duct.

[0010] 24-3403Furthermore, the invention relates to a motor vehicle with such an air outlet arrangement.

[0011] According to a further embodiment of the invention, the motor vehicle has a dashboard on which the air outlet is arranged. The air outlet can be designed directly as an opening in a wall of the dashboard and / or be mounted on or attached to the dashboard.

[0012] According to a further embodiment of the invention, the air guide plate can be extended from the dashboard with its pressure section leading and retracted into the dashboard with its suction section leading. In the fully retracted state, the air guide element is at least partially, and in particular almost completely, recessed into the dashboard. "Almost completely" is understood to mean that a maximum of 2 cm of the air guide element protrudes beyond the adjacent contour of the dashboard.

[0013] According to a further embodiment of the invention, the motor vehicle has at least two air guide plates which are arranged next to each other and, with respect to the dashboard, can be extended and retracted independently of each other.

[0014] According to a further embodiment of the invention, the air guide plate has an end face that leads when extending, and the air guide plate is guided on a path of movement when extending and retracting, which has a radius of curvature that corresponds to the radius of curvature of the air guide plate.

[0015] 24-3403 According to a further embodiment of the invention, at least one air guide plate is arranged behind the air outlet, with reference to a longitudinal axis of the vehicle.

[0016] According to a further embodiment of the invention, the at least one air guide plate is curved in such a way that an axis of curvature, with reference to a longitudinal axis of the vehicle, is arranged behind the air outlet.

[0017] According to a further embodiment of the invention, the air outlet has louvers with which the direction of flow of the airflow emitted by the air guide plate can be changed, so that depending on the position of the louvers, the airflow forms a different angle to an xz-plane of the motor vehicle.

[0018] According to a further embodiment of the invention, a motor vehicle is provided, wherein the air guide plate has a remote end which, at least in the fully extended state, represents an end of the air guide plate that is (farthest) from the air outlet, and wherein the air guide plate can be extended and retracted relative to the dashboard in such a way that, when extending and retracting, the remote end, with reference to an xz-plane, travels along a path of movement that lies within the fully extended air guide plate.

[0019] A preferred embodiment of the present invention is described below with reference to the accompanying drawings. These drawings illustrate the following:

[0020] Figure 1 shows a motor vehicle according to an embodiment of the invention;

[0021] 24-3403Figure 2 schematically shows an air outlet arrangement according to a first embodiment of the invention;

[0022] Figure 3 schematically shows a three-dimensional view of the air outlet arrangement according to the first embodiment of the invention with the air guide plate fully extended;

[0023] Figure 4 schematically shows a three-dimensional view of the air outlet arrangement from Fig. 3 from a different perspective, and

[0024] Figure 5 schematically shows a three-dimensional view of the air outlet arrangement from Fig. 3 with the air guide plate fully retracted.

[0025] Figure 1 shows a motor vehicle 1, in particular a passenger car, according to an embodiment of the invention. A coordinate system shows a longitudinal axis x, a transverse axis y, and a vertical axis z, all perpendicular to each other. The motor vehicle 1 has a passenger compartment 2 in which occupants sit on seats 3. A dashboard 4 is arranged at the front end of the passenger compartment 2. As is generally the case, the dashboard 4 is located at the front end of the passenger compartment 2 and extends across the entire width of the front end of the passenger compartment 2. An air outlet arrangement is also arranged on the dashboard 4, which will be explained in more detail below.

[0026] Figure 2 shows the air outlet arrangement according to a first embodiment of the invention. The air outlet arrangement has at least one air outlet 5 from which fresh air and / or recirculated air flows into the passenger compartment 2. An airflow 6 exiting the air outlet 5

[0027] 24-3403 comes via an air duct 7 from a vehicle air conditioning system (not shown) and can be heated or cooled. Furthermore, it can be fresh air, i.e., air from outside the vehicle, recirculated air, i.e., air from passenger compartment 2 which is returned to passenger compartment 2, or mixed air, i.e., an airflow mixed from fresh air and recirculated air.

[0028] Each air outlet 5 is associated with at least one air guide plate 8, which is arranged directly behind (relative to the vehicle's longitudinal axis x) the air outlet 5. The air guide plate 8 is curved and, for example, in a cross-section in an xz-plane, as shown in Fig. 2, forms a circular arc around an axis of rotation 9. The axis of rotation 9 is arranged behind the air outlet 5 (relative to the vehicle's longitudinal axis x) and is essentially parallel to the vehicle's transverse axis y. A convex surface 8A of the at least one air guide plate 8 points essentially forward and a concave surface 8B points essentially rearward (both relative to the vehicle's longitudinal axis x).

[0029] The air guide plate 8 can be designed to retract into and out of the instrument panel 4, in which case Figure 2 shows a fully extended position. To retract it, the air guide plate 8 is rotated about the pivot axis 9 until it is fully or almost fully recessed into the instrument panel 4. However, the air guide plate 8 can also be designed to be fixed and permanently assume a position corresponding to the fully extended position.

[0030] The air guide plate 8 is arranged at the air outlet 5 such that the airflow 6 exiting from the outlet flows along the convex surface 8A of the air guide plate 8, utilizing the Coandé effect. To ensure that the airflow 6 is guided along the convex surface 8A without detaching from it, a suction section is provided on the air guide plate 8.

[0031] 24-34038C, which is marked with a dashed line in Fig. 2. To further support a controlled separation of the airflow 6 at the end of the air guide plate 8 from the convex surface 8A, a pressure section 8D is formed on the air guide plate 8, which is also marked with a dashed line in Fig. 2.

[0032] The air guide plate 8 is designed to be porous, allowing air exchange between the convex surface 8A and the concave surface 8B. This porosity, or air permeability, can be achieved by means of numerous (small) through-holes, for example, each with a diameter of less than 0.5 mm, which are visible to the naked eye. Alternatively, it can be achieved by small micro-passages that are not visible to the naked eye but still allow for the corresponding air exchange.

[0033] The concave surface 8B of the suction section 8C is connected to a suction channel 10 in which a suction air pressure is generated by means of a pressure differential generator 12. For this purpose, the suction channel 10 spans the entire suction section 8C of the air guide plate 8 at its connection to the concave surface 8B. The contact surface of the connection is airtight. The interior of the suction channel is pneumatically connected to the concave surface 8B. The end of the suction channel 10 furthest from the concave surface 8B is connected to a suction side 11 of the pressure differential generator 12, which in the first embodiment is a fan 18, in particular a cross-flow fan. It could also be another type of fan, such as an axial fan or a radial fan. In this way, the suction side 11 of the pressure differential generator 12 is pneumatically connected to the concave surface 8B of the suction section 8C via the interior of the suction channel 10.

[0034] 24-3403 The concave surface 8B of the pressure section 8D is connected to a pressure channel 13 in which a pressure differential is generated by means of the pressure differential generator 12. For this purpose, the pressure channel 13 spans the entire pressure section 8D of the air guide plate 8 at the connection to the concave surface 8B. The contact surface of the connection is airtight. The interior of the pressure channel 13 is pneumatically connected to the concave surface 8B. The end of the pressure channel 13 furthest from the concave surface 8B is connected to a pressure side 14 of the pressure differential generator 12 or the fan 18. In this way, the pressure side 14 of the pressure differential generator 12 is pneumatically connected to the concave surface 8B of the pressure section 8D via the interior of the pressure channel 13.

[0035] This creates a suction pressure on the side of the air guide plate 8 where the concave surface 8B is located, in the area of ​​the suction section 8C, which is lower than the air pressure of the airflow 6 on the convex surface 8A, so that in the suction section 8C of the air guide plate 8 some air is drawn from the convex surface 8A through the air guide plate 8 to the concave surface 8B, as illustrated by a multitude of arrows pointing radially inwards (towards the axis of rotation 9).

[0036] Furthermore, this creates a pressure-air pressure on the side of the air guide plate 8 where the concave surface 8B is located, in the area of ​​the pressure section 8D, which is higher than the air pressure of the airflow 6 on the convex surface 8A, so that in the pressure section 8D of the air guide plate 8 some air is forced from the concave surface 8B through the air guide plate 8 to the convex surface 8A, as illustrated by an arrow pointing radially outwards (away from the axis of rotation 9).

[0037] As already mentioned, the air guide plate 8 can also be designed to be retractable and extendable. In this case, the assembly, which is permanently connected to each other, comprises the air guide plate 8, the suction duct 10, and the

[0038] 24-3403 Pressure channel 13 rotated around the axis of rotation 9 until the arrangement is almost completely recessed in the dashboard 4.

[0039] To adjust the angle of the airflow 15 exiting the air guide plate 8 relative to an xy-plane (i.e., a plane defined by the vehicle's longitudinal axis x and transverse axis y), it is possible to control this via the pressure difference between the suction air pressure and the pressure air pressure. If the suction air pressure is relatively low, this allows for earlier separation from the convex surface 8A than if separation occurs only upon reaching the end of the convex surface 8A. However, it is desirable for separation to occur only upon reaching the pressure section 8D, and for the angle relative to the xy-plane to be adjusted by changing the position of the air guide plate 8. For this to be possible, the air guide plate 8 would need to be retractable.

[0040] Depending on how far the air guide plate 8 is extended from the dashboard 4, this results in a different flow direction (relative to the xy-plane) of the airflow 15 exiting the air guide plate 8. The further the air guide plate 8 is extended, the lower the target region of the vehicle occupants, such as the abdomen, chest, or head. The air guide plate 8 can assume any desired position between the fully retracted and fully extended states, resulting in different angles of the airflow 15 (relative to the xy-plane) that affect different areas of the body depending on the occupants' height and seating position.

[0041] Figures 3 to 5 show schematic three-dimensional views of the air outlet assembly from different directions. Figures 3 and 4 each show the assembly fully extended.

[0042] 24-3403 Air guide plate 8. Figure 5 shows a fully retracted state of the air guide plate 8.

[0043] As can be seen in these figures, in this embodiment two air guide plates 8 are arranged side by side and rotatably mounted about a common axis of rotation 9. Likewise, two air outlets 5 are arranged side by side, each of which is assigned to one of the air guide plates 8. The two air guide plates 8 can be extended and retracted independently of each other.

[0044] In the fully retracted state (see Fig. 5), an outer surface 16 of a wall of the pressure channel 13 forms an outer contour flush with the adjacent instrument panel 4.

[0045] As can be seen in Figures 3 and 5, the air outlet 5 is equipped with louvers 17 which allow the direction of the airflow 6 discharged from the air outlet, and thus also of the airflow 15 discharged from the air guide plate 8, to be changed. Depending on the position of the louvers 17, the airflow 15 forms a different angle with an xz-plane of the vehicle, i.e., a plane spanned by the vehicle's longitudinal axis x and vertical axis z. If several air outlets 5 are present, the louvers 17 of each air outlet 5 can be controlled independently of the louvers 17 of the other air outlets 5. The louvers 17 assigned to a specific air guide plate 8 can be controlled together, so that when controlled, they all undergo the same change in angle.

[0046] As already mentioned, several air guide plates 8 can be provided. A single air outlet 5 can be assigned to these several air guide plates 8. This single air outlet 5 can be divided into several sections, each section of which is assigned to one of the air guide plates 8 and has a

[0047] 24-3403 group of interconnected or controllable louvers 17. Multiple air guide plates 8 can also have multiple air outlets 5, with each air guide plate 8 having its own air outlet 5.

[0048] According to a second embodiment of the invention, the pressure differential generating device 12 is a Venturi nozzle (not shown) instead of a fan 18. In a Venturi nozzle, due to a cross-sectional constriction caused by the Bernoulli effect, the air pressure upstream of the constriction is higher than downstream. In this way, the lower air pressure downstream of the constriction acts as the suction air pressure, which is applied to the concave surface 8B of the suction section 8C via the suction channel 10. The higher air pressure upstream of the constriction acts as the pressure air pressure, which is applied to the concave surface 8B of the pressure section 8D via the pressure channel 13. Otherwise, the second embodiment does not differ from the first embodiment, and reference is made to the description of the first embodiment.

[0049] While the invention has been illustrated and described in detail in the drawings and the preceding description, this illustration and description is to be understood as exemplary and not as limiting, and it is not intended to limit the invention to the disclosed embodiment. The mere fact that certain features are mentioned in various dependent claims is not intended to imply that a combination of these features could not also be used advantageously.

[0050] 24-3403

Claims

Claims 1. Air outlet arrangement, in particular for a motor vehicle (1) with an air outlet (5); a curved air guide plate (8) which is associated with the air outlet (5) and which is positioned to the air outlet (5) such that an airflow (6) exiting the air outlet (5) is guided along a convex surface (8A) of the air guide plate (8); wherein the air guide plate (8) is porous, so that an air exchange between the convex surface (8A) and a concave surface (8B) is possible through the air guide plate (8); wherein the air guide plate (8) has a suction section (8C) and a pressure section (8D) which is further away from the air outlet (5) than the suction section (8C); furthermore, with a pressure differential generating device (12) for generating a suction air pressure along the suction section (8C) on the concave surface (8B), so that air is drawn through the air guide plate (8) from the convex surface (8A) to the concave surface (8B), and a pressure air pressure along the pressure section (8D) on the concave surface (8B), so that air is pushed through the air guide plate (8) from the concave surface (8B) to the convex surface (8A).

2. Air outlet arrangement according to claim 1, wherein the pressure differential generating device (12) is a fan (18).

3. Air outlet arrangement according to claim 1 or 2, wherein the concave surface (8B) of the suction section (8C) is connected to a suction channel (10) which is connected to a suction side (11) of the differential pressure generating device (12), and 24-3403 wherein the concave surface (8B) of the pressure section (8D) is connected to a pressure channel (13) which is connected to a pressure side (14) of the differential pressure generating device (12).

4. Air outlet arrangement according to claim 1 or 3, wherein upstream of the air outlet (5) at least a part of the incoming air is guided through a Venturi nozzle, so that the Venturi nozzle forms the pressure differential generating device (12), wherein a suction side of the Venturi nozzle is connected to the concave surface (8B) of the suction section (8C), and wherein a pressure side of the Venturi nozzle is connected to the concave surface (8B) of the pressure section (8D).

5. Motor vehicle (1 ) with an air outlet arrangement according to one of claims 1 to 4.

6. Motor vehicle (1 ) according to claim 5, with a dashboard (4) on which the air outlet (5) is arranged.

7. Motor vehicle (1 ) according to claim 6, wherein the air guide plate (8) is extendable from the dashboard (4) with its pressure section (8D) forward and is retractable into the dashboard (4) with its suction section (8C) forward.

8. Motor vehicle (1 ) according to claim 6 or 7, with at least two air guide plates (8) arranged side by side and, with respect to the dashboard (4), independently extendable and retractable.

9. Motor vehicle (1) according to claim 7 or 8, wherein the air guide plate (8) has an end face which leads during extension, and the air guide plate (8) rests on a 24-3403 motion path is guided which has a radius of curvature that corresponds to the radius of curvature of the air guide plate (8).

10. Motor vehicle (1 ) according to any one of claims 5 to 9, wherein the at least one air guide plate (8) is arranged behind the air outlet (5) with respect to a longitudinal axis (x) of the vehicle.

11. Motor vehicle (1 ) according to one of claims 6 to 10, wherein the at least one air guide plate (8) is curved such that an axis of curvature, with respect to a longitudinal axis of the vehicle (x), is arranged behind the air outlet (5).

12. Motor vehicle (1 ) according to one of claims 6 to 11, wherein the air outlet (5) has louvers (17) with which a flow direction of the airflow (15) emitted by the air guide plate (8) can be changed, so that depending on the position of the louvers (17) the airflow (15) forms a different angle to an xz-plane of the motor vehicle (1). 24-3403

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