FR3069620B1 - 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 for ejecting (10) an air flow (F) distinct from its ends (6), at least one of the tubes (3) being pivotally mounted between a closed position and an open position, - at least one air collector (5) comprising an orifice for receiving one of the ends (6) of said at least one orientable tube, - one end (6) of said at least one orientable tube (3) being mounted in said receiving orifice so as to form a fluid connection between said at least one manifold and said tube (3), and - a sealing member (20) for sealing said fluidic connection in at least the open position of the tubes (3) .

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 "mask" 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 pivotally mounted between a closed position and an open position, the ventilation device being configured to let more air into the open position than in the closed position, at least one air collector for distributing the air to at least a portion of the tubes, said at least one air collector comprising an orifice for receiving one of the ends of said at least one orientable tube said end of said at least one steerable tube being mounted in said receiving port so as to form a fluid connection between said at least one manifold and said tube, and a sealing member to seal said fluidic connection in at least the open position of the tubes.

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.

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.

In addition, the fluid connection between the collector and the tubes being sealed by the sealing element, the energy efficiency of the ventilation device is improved, since the air leaks between the collector and the tubes are limited or completely eliminated in the open position of the tubes.

According to another characteristic of the invention, the sealing element is a seal.

According to another characteristic of the invention, the seal has a circular or oblong shape.

According to another characteristic of the invention, the seal is flat type.

According to another characteristic of the invention, the seal comprises lips, preferably U-shaped or V-shaped.

According to another characteristic of the invention, the lip seal comprises a spring.

According to another characteristic of the invention, the sealing element is disposed in the receiving orifice of said at least one manifold.

According to another characteristic of the invention, the tubes are positioned relative to each other so as to block an air flow in the closed position, and so as to circulate an air flow in the open position.

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. 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 accompanying drawings in which: - Figure 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 partial cross-sectional view of the ventilation device of FIG. 1 according to a first embodiment of the invention; FIG. 6 illustrates a partial cross-sectional view of the ventilation device of FIG. 1 according to a second embodiment of the invention; FIG. 7 illustrates a partial cross-sectional view of the ventilation device of FIG. 1 according to a third embodiment of the invention; and FIG. 8 illustrates a perspective view of a sealing element of the ventilation device of FIG. 1 according to a fourth embodiment of the invention.

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 set of tubes 3 constitutes a fan grille 8.

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.

As can be seen in the figures, the two collectors 5 extend parallel to each other, orthogonally to a longitudinal direction L along which the tubes 3 extend.

Each manifold 5 comprises a plurality of orifices 9.

Each orifice 9 is shaped to receive one of the ends 6 of the tubes 3.

Each end 6 of the tubes 3 is inserted into one of the receiving orifices 9 so as to form a fluid connection 30 between the collector 5 and the tube 3.

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 via the fluidic connections 30. The invention is now more particularly described in relation to FIG. 2.

As can be seen in FIG. 2, each ventilation tube 3 comprises an opening 10 distinct from the ends 6, 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 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.

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 8 is larger 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.

Preferably, in the open position, the gate 8 blows air towards the heat exchanger 100 while in the closed position the gate 8 does not blow air.

Sealing element

As particularly visible in FIGS. 5 to 8, the ventilation device 1 comprises at least one sealing element 20.

In the illustrated embodiments, each sealing member 20 is a seal.

As is apparent from FIGS. 5 to 8, each seal 20 is disposed in one of the orifices 9.

More specifically, each seal 20 is disposed against the periphery of the associated orifice 9. The associated end 6 of the tube 3 is inserted into the orifice 9 carrying the seal 20.

According to the first embodiment illustrated in FIG. 5, each seal 20 is a U-shaped lip seal.

In the open position, the air circulates in each manifold 5 and then in the tubes 3.

Two branches 21, 22, forming the U of each seal 20 deviate from one another, which plate one 21 of the branches 21, 22 against the collector 5 and the other 22 of the branches 21,22 against the end 6.

Thus, the fluidic connection 30 is sealed.

According to the second embodiment illustrated in FIG. 6, each seal 20 is a V-shaped lip seal.

In the open position, the air circulates in each manifold 5 and then in the tubes 3.

Two branches 21, 22, forming the V of each seal 20 deviate from one another, which plate one 21 of the branches 21, 22 against the collector 5 and the other 22 of the branches 21,22 against the end 6.

Thus, the fluidic connection 30 is sealed.

According to the third embodiment illustrated in FIG. 7, each seal 20 is a U-shaped lip seal with an integrated spring 23.

The spring 23 exerts a pressure on the end of the tube 6, which clamps the seal on the tube 3.

The seal 20 is mounted tight against the orifice 9.

According to this embodiment, the seal is provided directly by the pressure exerted by the spring 23, regardless of the pressure exerted by the air.

As can be seen from FIGS. 5 to 8, each seal has a section whose shape corresponds to a section of the orifice 9, a section of which corresponds to a section of the associated end 6.

In FIGS. 5 to 7, each seal 20 has a circular shape.

In Figure 8, each seal 20 has an oblong shape.

According to the embodiment of Figure 8, each seal 20 is flat. The invention has been illustrated according to various embodiments, which, of course, are not limiting.

In particular, the tubes are not necessarily profiled to allow a coanda effect.

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

For example, the seals 20 may be flat with a circular section.

Claims (3)

A ventilation device for generating a flow of air towards a motor vehicle heat exchanger, comprising: tubes (3), each tube (3) being provided with at least one ejection opening ( 10) an air flow (F) distinct from its ends (6), at least one of the tubes (3) being pivotally mounted between a closed position and an open position, - at least one air collector (5) for distributing the air to at least a portion of the tubes (3), said at least one air collector (5) comprising at least one receiving orifice of one of the ends (6) of said at least one orientable tube, - said end (6) of said at least one orientable tube (3) being mounted in said receiving orifice so as to form a fluid connection between said at least one manifold and said tube (3), and - an element sealing (20) for sealing said fluidic connection in at least the open position of the tubes (3). 2. Ventilation device according to the preceding claim, wherein the sealing element (20) is a seal. 3. Ventilation device according to the preceding claim, wherein the seal (20) has a circular or oblong shape. 4. Ventilation device according to one of claims 2 or 3, wherein the seal (20) is flat type. 5. Ventilation device according to one of claims 2 or 3, wherein the seal (20) comprises lips, preferably of type U or V. 6. Ventilation device according to the preceding claim, in wherein the lip seal (20) comprises a spring (23). 7. Ventilation device according to one of the preceding claims, wherein the sealing member (20) is disposed in the receiving orifice (9) of said at least one collector (5). 8. Ventilation device according to one of the preceding claims, wherein 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 open position. 9. Ventilation device according to one of the preceding claims, wherein each tube (3) has a section comprising: - a leading edge (11), - a trailing edge (15), opposite the leading edge. (11), - a first and a second profile (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 an air flow exiting the aperture (10) flows along at least a portion of said one of the first and second profiles (12, 14). 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 being positioned relative to one another. another so that a flow of air set in motion by the ventilation device supplies air to the heat exchanger.