FR3073563B1 - VENTILATION DEVICE FOR MOTOR VEHICLE - Google Patents

Abstract

The invention relates to a ventilation device for generating an air flow towards a motor vehicle heat exchanger, comprising: tubes (3), each tube (3) being provided with at least one opening of ejecting an air flow (F) distinct from its ends (6, 7), at least one of the tubes (3) being provided with a noise reduction element (20).

Description

The invention relates to a ventilation device for a motor vehicle.

The invention relates to the field of the automobile, and more particularly to the field of air circulation for cooling the engine and its equipment.

Motor vehicles, whether combustion or electric, need to evacuate the calories generated by their operation and are therefore equipped with heat exchangers. A motor vehicle heat exchanger generally comprises tubes, in which a heat transfer fluid is intended to circulate, in particular a liquid such as water, and heat exchange elements connected to these tubes, often referred to as " fins >> or "spacers". The fins increase the exchange surface between the tubes and the ambient air.

However, in order to further increase the heat exchange between the coolant and the ambient air, it is frequent that a ventilation device is used in addition, to generate or increase a flow of air directed to the tubes and the fins.

Such a ventilation device most often comprises a propeller fan, which has several disadvantages.

First, the assembly formed by the propeller fan and its motorization system occupies a large volume.

In addition, the distribution of the air vented by the propeller, often placed in the center of the row of tubes, is not homogeneous over the entire surface of the heat exchanger. In particular, some regions of the heat exchanger, such as the ends of the heat pipes and the corners of the heat exchanger, are not or only slightly reached by the air flow ejected by the propeller.

Furthermore, when the start of the ventilation device is not necessary, especially when the heat exchange with the ambient air is sufficient to cool the heat transfer fluid, the blades of the propeller obstruct or "hide" >> in part the flow of ambient air to the tubes and fins. This limits the exchange of heat between the ambient air, on the one hand, and the tubes and fins, on the other hand.

Another disadvantage is that, when the outside temperature is low or negative, the fan propeller blows cold air on the heat exchanger, which has the effect of slowing the temperature rise of the vehicle engine.

Moreover, in this case, the friction of the engine is reduced less rapidly, which increases the consumption of the vehicle and therefore the emission of carbon dioxide.

An object of the invention is to provide a ventilation device for heat exchanger not having at least some of the disadvantages of known heat exchanger ventilation devices.

For this purpose, the subject of the invention is a ventilation device intended to generate an air flow towards a motor vehicle heat exchanger, comprising tubes, each tube being provided with at least one opening of ejection of an air flow distinct from its ends, at least one of the tubes being provided with a noise reduction element.

Thus, advantageously, the plurality of tubes from which air is ejected makes it possible to replace the conventional propeller disposed in front of the circulation tubes of a heat transfer fluid of the heat exchanger, without presenting the disadvantages mentioned above.

Indeed, with equal heat exchange capacity, the volume occupied by such a ventilation device is much less than a propeller ventilation device. In addition, the distribution of air vented by the tubes is easier to control and can be made more homogeneous.

In addition, thanks to the device according to the invention, it limits the obstruction of the flow of air to the heat exchanger. In fact, the tubes of the ventilation device can advantageously be arranged facing areas of low heat exchange of the heat exchanger, called "dead zones", such as the end faces of the tubes through which the heat transfer fluid, which does not are not in contact with cooling fins. This is not possible with a conventional propeller.

Furthermore, the invention makes it possible to deport the air ejection means supplying air flow to the tubes of the ventilation device, at a distance from the row of heat transfer fluid circulation tubes, which offers greater freedom in the design of the heat exchanger.

In addition, the noise reduction element attenuates the sound waves generated by the flow of air through the tubes and which could cause discomfort for the occupants of the motor vehicle.

According to another characteristic of the invention, each tube has a section comprising a leading edge, a trailing edge, opposite to the leading edge, a first and a second profile, each extending between the leading edge. and the trailing edge, said at least one aperture of the tube being on one of the first and second profiles, said at least one aperture being configured such that an airflow exiting the aperture flows along at least a portion of said one of the first and second profiles.

According to another characteristic of the invention, the noise reduction element comprises at least one serration formed on at least part of the leading edge and / or at least part of the trailing edge.

According to another characteristic of the invention, the serration comprises a plurality of teeth in the form of a triangle or wave.

According to another characteristic of the invention, the teeth are identical or have at least two different sizes.

According to another characteristic of the invention, a summit part of at least one of the teeth comprises a recess.

According to another characteristic of the invention, the serration has a periodic shape.

According to another characteristic of the invention, the serration extends over the entire length of the leading edge and / or the trailing edge.

According to another characteristic of the invention, at least one of the tubes is pivotally mounted.

Therefore, the ventilation device according to the present invention proposes an air intake shutter function and a ventilation function of the exchangers in a compact space allowing better thermal management of a motor vehicle, since the grate is blowing.

Depending on the orientation of the tubes, the device makes it possible to adjust the flow of air that arrives at the heat exchanger, making it possible to optimize thermal management.

According to another characteristic of the invention, said at least one pivoting tube is pivotally mounted between a closed position and an open position, the closed position leaving a space between said tube and an adjacent tube which is less than a space between said tube and said adjacent tube in the open position.

Preferably, the tubes are positioned relative to each other so as to block an air flow in the closed position, and so as to circulate a flow of air in the open position.

The invention also relates to a heat exchange module for a motor vehicle, comprising a ventilation device as described above, and a heat exchanger, the ventilation device and the heat exchanger being positioned relative to one another. to the other so that a flow of air set in motion by the ventilation device supplies air to the heat exchanger.

Other characteristics and advantages of the invention will appear on reading the description which follows. This is purely illustrative and should be read in conjunction with the attached drawings in which:

FIG. 1 illustrates a perspective view of a heat exchange module equipped with a ventilation device according to the present invention;

- Figure 2 illustrates a cross-sectional view of two tubes of Figure 1;

FIG. 3 illustrates a cross-sectional view of the ventilation device of FIG. 1 in a first position;

- Figure 4 illustrates a cross sectional view of the ventilation device of Figure 1, in a second position;

FIG. 5 illustrates a perspective view of a tube according to one embodiment of the invention;

FIG. 6 illustrates a perspective view of a detail of FIG. 5;

- Figure 7 illustrates a top view of a detail of Figure 5;

FIG. 8 illustrates another perspective view of a detail of FIG. 5;

FIG. 9 illustrates a perspective view of a tube according to another embodiment of the invention;

FIG. 10 illustrates a perspective view of a detail of FIG. 9; and

FIG. 11 illustrates a view from above of a detail of FIG. 9.

Heat exchange module

The invention relates to a ventilation device 1 for a motor vehicle.

The invention also relates to a heat exchange module 100, comprising the ventilation device 1 and a heat exchanger 101.

As can be seen in FIG. 1, the ventilation device 1 and the heat exchanger 101 are positioned relatively to one another so that a flow of air set in motion by the ventilation device 1 supplies air. the heat exchanger, preferably for cooling the engine of the motor vehicle.

The ventilation device 1 is disposed upstream of the heat exchanger 101 in Figure 1 (relative to a flow of air from outside the moving vehicle).

Nevertheless, the ventilation device may also be disposed downstream of the heat exchanger 101.

Ventilation device

As shown in the figures, the ventilation device 1 comprises a plurality of tubes 3.

The tubes are advantageously made of plastic material, or doped plastic, or metal material.

Preferably, the tubes 3 are substantially rectilinear, parallel to each other and aligned so as to form one or more rows of tubes.

The ventilation device 1 also comprises an air supply device for an air flow F.

This device supplies the ventilation tubes 3 via an air supply circuit 4.

The air supply circuit 4 comprises in particular two air intake manifolds 5 to which the ventilation tubes 3 are connected via air supply inlets at each of their ends 6, 7.

Advantageously, the supply circuit also comprises one or more turbomachines (not shown), for example a turbomachine disposed at the bottom of each manifold, for ejecting the air through the intake manifolds 5, into the ventilation tubes 3 .

As shown in the figures, the two collectors 5-1, 5-2 extend parallel to each other, orthogonally to the tubes 3.

The invention is now more particularly described in relation with FIG.

As can be seen in FIG. 2, each ventilation tube 3 comprises an opening 10 distinct from the ends 6, 7, to eject the air out of the tube 3.

Preferably, the openings 10 are intended to be arranged facing the heat exchanger.

As can be seen in FIG. 2, each tube 3 comprises a longitudinal wall 19 whose cross-section comprises a free leading edge 11, a trailing edge 15 and first and second profiles 12, 14, each extending between the leading edge 11 and the trailing edge 15.

The trailing edge 15 is preferably arranged opposite the heat exchanger.

The longitudinal wall 19 is delimited by an inner surface 16 and an outer surface 18.

Each opening 10 is made in the longitudinal wall 19 of the tube

3, preferably in one or the other of the profiles 12, 14.

In FIG. 2, each opening 10 is positioned near the leading edge 11.

As also visible in Figure 2, the openings 10 of the pair of tubes 3 shown are formed in the profiles 12 facing each other.

Thus, the ventilation tubes 3 and their openings 10 are configured so that the flow of air F flowing in the ventilation tubes 3 is ejected through the opening 10 by flowing along each profile 12, substantially until at their trailing edges 52, by Coanda effect.

The flow of air F ejected from the tubes 3 accelerates another flow F 'in a direction of flow to the heat exchanger.

It should be noted that the cross-sections of the tubes 3 are such that the profiles 12 extend in a direction away from the tubes 3 from the leading edges 11 to the trailing edges 15.

As is apparent from FIGS. 5 to 10, the ventilation device is provided with a means for protecting at least one of the tubes 3, referenced 50.

Swivel mounted tubes

At least one of the ventilation tubes 3 is mounted swiveling, preferably pivotable.

In the illustrated embodiment, all the tubes 3 are pivotally mounted.

As can be seen from the figures, the tubes 3 are pivotally mounted between a closed position (FIG. 3) and an open position (FIG. 4), the closed position leaving a space between two adjacent tubes 3 less than a space between two adjacent tubes 3 in the open position.

In other words, the amount of air flowing through the blower gate 30 is greater in the open position than in the closed position.

In the illustrated embodiment, the tubes 3 are positioned relative to each other so as to block an air flow in the closed position, and so as to circulate a flow of air in the open position.

Of course, the invention is not limited to this configuration, and it is quite possible to provide a multitude of positions according to which more or less air passes through the tubes.

Thus, the ventilation device 1 has an air intake shutter function and a ventilation function of the exchangers in a compact space for better thermal management of a motor vehicle, since the gate is blowing.

Depending on the orientation of the tubes, the device 1 makes it possible to adjust the flow rate of air that arrives at the heat exchanger, which also makes it possible to optimize the efficiency of the heat exchanger.

The closed position is advantageous for example when the vehicle is traveling, especially at high speed, since in this position, the drag coefficient of the vehicle is reduced, and its aerodynamics improved.

The open position is advantageous for example when the vehicle is stopped, since in this position, the ventilation of the engine compartment is improved.

Noise reduction element

In FIGS. 5 to 11, one of the tubes 3 is illustrated.

This tube 3 is provided with a noise reduction element, referenced 20.

The noise reduction element 20 attenuates the sound waves generated by the flow of air through the tubes and which could cause discomfort for the occupants of the motor vehicle.

As illustrated in FIGS. 5 to 11, the noise reduction element consists of at least one serration 21 of the longitudinal wall 19.

In the embodiment illustrated in FIGS. 5 to 8, the noise reduction element comprises two serrations 21 formed in the leading edge 11.

In the embodiment illustrated in FIGS. 9 to 11, the serration 21 is formed in the trailing edge 15.

Each serration 21 makes it possible to break the turbulence generated by the associated leading or trailing edge, thereby reducing the noise due to the flow of air through the tube 3.

With reference to FIGS. 5 to 8, each serration 21 extends over the entire length of the leading edge 11.

In the embodiment of FIGS. 5 to 8, the tube 3 is a double flow ejector, that is to say that the tube 3 comprises two openings 10 for ejecting the air flow F.

Each serration 21 delimits one of the two openings 10 of the tube 3.

With reference to FIGS. 9 to 11, each serration 21 extends over the entire length of the trailing edge 15.

With reference to FIGS. 5 to 11, each serration 21 comprises a plurality of wave-shaped teeth 22.

Preferably, the teeth 22 are identical.

As is apparent from Figures 5 to 11, the teeth 22 are regularly spaced.

As shown in Figures 5 to 11, each serration 21 has a periodic shape.

The fact that the teeth 22 are identical and regularly spaced ensures a simplicity of the method of manufacturing the tube 3 and an identical reduction of the noise along the entire length of the associated edge.

Of course, the invention is not limited to the illustrated embodiments.

In particular, other forms of teeth 22 are conceivable.

For example, the teeth 22 may be pointed, in particular 5 triangular.

It is also possible that a top portion 23 of at least one of the teeth includes a recess, to further reduce the noise generated by the flow of air.

Depending on the dimensions of the device 1, the tubes 3, and their arrangement relative to each other, it is also possible to envisage that the teeth are of different sizes.

It is added that the embodiments are combinable to the extent that they are not incompatible.

Claims (10)

A ventilation device for generating a flow of air to a motor vehicle heat exchanger, comprising: tubes (3), each tube (3) being provided with at least one ejection opening (10) of an air flow (F) distinct from its ends (6, 7), at least one of the tubes (3) being provided with a noise reduction element (20). 2. Ventilation device according to claim 1, wherein each tube (3) has a section comprising: a leading edge (11), a trailing edge (15) opposite to the leading edge (11), first and second profiles (12, 14), each extending between the leading edge (11) and the trailing edge (15), said at least one opening (10) of the tube (3) being on one of the first and second profiles (12, 14), said at least one aperture (10) being configured such that a flow of air exiting the aperture (10) flows along at least a portion of said one of the first and second profiles (12, 14). Ventilation device according to the preceding claim, wherein the noise reduction element (20) comprises a serration (21) formed on at least a portion of the leading edge (11) and / or at least a portion of the trailing edge (15). 4. Ventilation device according to the preceding claim, wherein the serration (21) comprises a plurality of teeth (22) in the form of a triangle or wave. 5. Ventilation device according to the preceding claim, wherein the teeth (22) are identical or have at least two different sizes. 6. Ventilation device according to one of claims 4 or 5, wherein a top portion (23) of at least one of the teeth (22) comprises a recess. 5 7. Ventilation device according to one of claims 3 to 6, wherein the serration (21) has a periodic shape. 8. Ventilation device according to one of claims 3 to 7, wherein the serration (21) extends over the entire length of the leading edge (11) and / or the trailing edge (15). io 9. Ventilation device according to one of the preceding claims, wherein at least one of the tubes (3) is pivotally mounted. 10. Heat exchange module for a motor vehicle, comprising a ventilation device according to one of the preceding claims, and a heat exchanger, the ventilation device and the heat exchanger 15 being positioned relative to one another. other so that a flow of air set in motion by the ventilation device supplies air to the heat exchanger.