Motor vehicle ventilation device housing.

Abstract

The invention relates to a housing (1) for a motor vehicle ventilation device, the ventilation device (3) being of the type implementing a Coanda effect, the housing (1) defining an air inlet (4), having at least one inlet opening (5), and an air outlet (6), having at least one outlet opening (7), the housing (1) defining an internal volume (8) designed to allow the circulation of an airflow from the air inlet (4) to the air outlet (6) when the housing (1) is mounted on the device (3), the internal volume (8) being dimensioned to accommodate an airflow guidance unit (2) exploiting the Coanda effect, the housing (1) being characterized in that it comprises at least one discharge orifice (12), each provided in a zone (13) of the housing (1), separate from the air outlet (6), to allow the discharge of a portion of the airflow to the outside of the housing (1). (Figure 1)

Description

Title of the invention: Ventilation device housing for motor vehicles.

[0001] The technical field relates to housings for ventilation devices, ventilation devices equipped with such housings and finally vehicles equipped with such ventilation devices.

[0002] Automobile manufacturers pay close attention to the comfort of their vehicle passengers. Among the essential comfort criteria is, of course, the management of the air inside the passenger compartment, including the control of temperature, humidity levels, and air quality. To this end, vehicles are commonly equipped with a ventilation system designed to manage the air quality inside the passenger compartment. The ventilation system organizes the circulation and treatment of the air in the passenger compartment, notably by replacing the air extracted from the passenger compartment by an air extractor with fresh air from outside. The ventilation system is also responsible for managing the airflow emitted into the passenger compartment by various diffusers, modifying, on demand, the quantity of air and the direction of the airflow exiting each diffuser.

[0003] Historically, a fan blows air, possibly conditioned, into the ventilation system via ducts leading to diffuser nozzles equipped with vanes designed to distribute the air into the passenger compartment. The vanes allow the nozzle to be opened or closed, or to direct the airflow supplying the nozzle, thus directing the airflow into the passenger compartment in a chosen direction. However, these nozzles have the disadvantage of being unsightly and negatively impact the perceived quality level for users.

[0004] Recently, in order to overcome the drawbacks of conventional nozzles, new ventilation devices have been developed. They implement the physical phenomenon known as the "Coanda effect," whereby an airflow follows a curved surface and undergoes a deflection before exiting with a trajectory different from its upstream path. The flows implemented exhibit low pressure losses and thus generate little noise. Therefore, ventilation devices implementing the Coanda effect have the advantage of being particularly aesthetically pleasing and significantly improve the perceived quality of the entire vehicle dashboard. Such a device implementing the Coanda effect is, for example, described in US patent document 2022 / 0161634. In the following, a device or guidance unit implementing the Coanda effect refers to a device ventilation whose operating principle is similar to that described in this patent document.

[0005] However, Coanda effect ventilation devices present homogeneity problems along the direction of the flow ejected into the passenger compartment: for example, pressure losses and overspeed and / or overpressure phenomena are observed when the flow undergoes a deviation close to the maximum possible deviations.

[0006] Thus, there is a need for a solution to avoid overspeed and overpressure problems when the airflow is diverted from a neutral direction.

[0007] The present invention aims to overcome the problems described above. In this technical context, one objective of the present invention is to provide a housing for a ventilation device of the type implementing a Coanda effect capable of reducing the observed overpressure and overvelocity phenomena.

[0008] To this end, the present invention relates to a housing for a ventilation device of a motor vehicle, the ventilation device being of the type implementing a Coanda effect, the housing defining an air inlet, having at least one inlet opening, and an air outlet, having at least one outlet opening, the housing defining an internal volume designed to allow the circulation of an airflow from the air inlet to the air outlet, when the housing is mounted on the device, the internal volume being dimensioned to accommodate an airflow guidance unit exploiting the Coanda effect, the housing being characterized in that it includes at least one evacuation orifice each provided in an area of ​​the housing, distinct from the air outlet, to allow the evacuation of a part of the airflow to the outside of the housing.

[0009] The invention also relates to a ventilation device designed to ventilate a motor vehicle passenger compartment, the device comprising a housing according to the invention and a guidance unit disposed in the internal volume of the housing to guide an airflow, circulating between the air inlet and the air outlet of the housing, by implementing the Coanda effect, the unit having curved walls forming, in the internal volume of the housing, at least one channel to guide the airflow between the air inlet and the air outlet.

[0010] The invention finally relates to a motor vehicle comprising at least one ventilation device according to the invention.

[0011] Thus, the housing according to the invention makes it possible to obtain an aeration device according to the invention implementing a Coanda effect. Experience has shown that the housing according to the invention makes it possible to reduce, or even eliminate, the effects of overspeed and / or overpressure observed previously. Indeed, the discharge ports prevent the formation of overpressures in each channel. Advantageously, the housing according to the invention makes it possible to upgrade an aeration device such as that described in the cited patent document in order to improve it and reduce or even eliminate the observed drawbacks.

[0012] According to one embodiment of the invention, each evacuation orifice has a slot shape extending on a wall of the housing in a direction substantially parallel to the direction of the airflow.

[0013] According to one possibility, each slot has a curved shape.

[0014] Advantageously, all the drainage ports are located on the same face of the housing.

[0015] In one embodiment of the device, the shape of each slot corresponds to the shape of one of the curved walls of the guide unit.

[0016] According to one possibility of the device, each slot extends along the right side of a curved wall.

[0017] Advantageously, the guide unit includes at least one movable flap extending a curved wall.

[0018] The invention will be better understood upon reading the following detailed description, given solely by way of non-limiting example and made with reference to the accompanying drawings in which:

[0019] [Fig-1] [Fig.1] represents a perspective and top view of a device ventilation according to the invention implementing a housing according to the invention;

[0020] [Fig.2] [Fig.2] represents a top view of the ventilation device of [Fig.1], Part of the casing is not shown to facilitate understanding of how the device works.

[0021] In these figures, the same references are used to designate the same elements.

[0022] A housing 1 according to the invention, illustrated in [Fig. 1], contains a guide unit 2 to form a ventilation device 3 according to the invention, designed to ventilate the passenger compartment of a motor vehicle. The ventilation device 3 is of the type implementing a Coanda effect.

[0023] The housing 1 defines an air inlet 4, having at least one inlet opening 5, and an air outlet 6, having at least one outlet opening 7. In a vehicle according to the invention, the air inlet 4 is, for example, supplied by a fan generating a flow of air, possibly conditioned. The air outlet 6 is generally located in a dashboard, not shown, and allows the airflow generated by the fan to be delivered into the passenger compartment.

[0024] The housing 1 defines an internal volume 8 designed to allow the circulation of the airflow, represented by arrows on the [Fig.2], from the air inlet 4 to the air outlet 6, when the housing 1 is mounted on the device 3.

[0025] As illustrated in [Fig. 2], the internal volume 8 is dimensioned to accommodate the guidance unit 2. The guidance unit 2 has curved walls 9 forming channels 10 within the internal volume 8 of the housing 1 to guide the airflow between the air inlet 4 and the air outlet 6. The dimensions of each channel 10 are adapted to the circulation of a laminar airflow adhering to the curved walls 9 and to deflect it by a Coanda effect. The device 3 thus formed by the guidance unit 2 disposed within the internal volume 8 of the housing 1 further comprises a plurality of movable flaps 11, illustrated in [Fig. 2], arranged upstream of each channel 10 to modulate the distribution of the airflow passing through the channel 10. The operating principle of the ventilation device 3 according to the invention is similar to that described in the patent document cited above.

[0026] The housing 1 further includes at least one evacuation port 12, each provided in an area 13 of the housing 1, separate from the air outlet 6, to allow the evacuation of part of the airflow to the outside of the housing 1.

[0027] As illustrated in [Fig.1], all the drainage ports 12 are provided on the same face 14 of the housing 1.

[0028] In the example illustrated in [Fig. 1], each discharge orifice 12 has a slot-shaped form 15 extending along a wall 16 of the housing 1 in a direction substantially parallel to the direction of the airflow, in the area 13 of the slot 15. As illustrated, each slot 15 has a curved shape. The shape of each slot 15 corresponds to the shape of one of the curved walls 9 of the guide unit 2. Advantageously, each slot 15 extends along the edge of a curved wall 9.

[0029] Thus, the housing 1 according to the invention makes it possible to obtain a ventilation device 3 that utilizes the Coanda effect while avoiding, or even eliminating, the drawbacks usually observed. The slots 15 effectively prevent the formation of overpressure and therefore overspeed in the airflow in each channel 10.

[0030] The invention is not limited to the embodiment of the housing described above, only by way of example, but other embodiments can be designed by a person skilled in the art without departing from the scope and extent of the present invention.

Claims

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8. Demands A motor vehicle ventilation device of the type implementing a Coanda effect, comprising a housing (1) defining an air inlet (4), having at least one inlet opening (5), and an air outlet (6), having at least one outlet opening (7), the housing (1) defining an internal volume (8) designed to allow the circulation of an airflow from the air inlet (4) to the air outlet (6); and a guidance unit (2) disposed in the internal volume (8) of the housing (1) to guide the airflow by implementing the Coanda effect, the unit (2) having curved walls (9) forming, in the internal volume (8) of the housing (1), at least one channel (10) to guide the airflow between the air inlet (4) and the air outlet (6);the device (3) being characterized in that the housing (1) has at least one evacuation orifice (12) each provided in an area (13) of the housing (1), separate from the air outlet (6), to allow the evacuation of part of the airflow to the outside of the housing (1).; Ventilation device (3) according to claim 1, characterized in that each evacuation orifice (12) has a slot shape (15) extending on a wall (16) of the housing (1) in a direction substantially parallel to the direction of the airflow. Ventilation device (3) according to claim 2, characterized in that each slot (15) has a curved shape. Ventilation device (3) according to claim 3, characterized in that all the evacuation orifices (12) are provided on the same face of the housing (1). Ventilation device (3) according to any one of claims 2 to 4, characterized in that the shape of each slot (15) corresponds to the shape of one of the curved walls (9) of the guide unit (2). Device (3) according to any one of claims 2 to 5, characterized in that each slot (15) extends along a curved wall (9). Device (3) according to any one of the preceding claims, characterized in that the guiding unit (2) comprises at least one movable flap (11) extending from a curved wall (9). Motor vehicle comprising at least one ventilation device (3) according to any one of claims 1 to 7.