FR3069621B1 - VENTILATION DEVICE FOR MOTOR VEHICLE - Google Patents

Abstract

The invention relates to a ventilation device for generating an air flow in the direction of a motor vehicle heat exchanger, comprising tubes (3), each tube (3) being provided with at least one opening of ejection of 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, the ventilation device (1) being configured for closed, to let more air in the open position than in the position minus an air manifold (5) comprising an orifice (9), one of the ends (6) of the steerable tube (3) being mounted in said receiving port to form a fluid connection (30) between said at least one manifold (5) and said tube (3), a sealing member (20), and a compression mechanism (40) of the sealing member (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 "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 one of the tubes said end of said 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 for sealing said connection fluidics.

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 ventilation device according to the present invention provides 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 grid 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 tube or tubes being sealed by the sealing member, preferably at least in the open position of the tubes, the energy efficiency of the ventilation device is improved, since the leaks air between the collector and the tube or tubes are limited or completely eliminated.

According to another characteristic of the invention, the compression mechanism comprises a ring of the end of the steerable tube and provided with a lug protruding axially in a longitudinal direction of the at least one orientable tube.

According to another characteristic of the invention, the compression mechanism comprises a housing for receiving the ring of the steerable tube.

According to another characteristic of the invention, the receiving housing of the ring comprises an insertion flange of the lug.

According to another characteristic of the invention, the device comprises a part carrying a plurality of receiving housings, each receiving housing being provided with an insertion flange.

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

According to another characteristic of the invention, the compression mechanism comprises at least one pin protruding axially out of an axis of rotation of the steerable tube.

According to another characteristic of the invention, the compression mechanism comprises at least two pins protruding axially out of the axis of rotation of the steerable tube, an angular distance between two adjacent pins corresponding to a steerable tube stroke from one open or closed positions to the other closed or open positions.

According to another characteristic of the invention, the compression mechanism comprises at least one cavity for receiving a pin.

According to another characteristic of the invention, the compression mechanism comprises a part carrying a plurality of cavities for receiving a pin.

According to another characteristic of the invention, the sealing element is an oblong section seal.

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 perspective view of another embodiment of the ventilation device in a first position; FIG. 4 illustrates a perspective view of the ventilation device of FIG. 3 in a second position; FIG. 5 illustrates an exploded view of a portion of the ventilation device of FIG. 1 according to a first embodiment of the invention; FIG. 6 illustrates an exploded view of details of FIG. 5; FIG. 7 illustrates a perspective view of a part of the ventilation device of FIG. 5 in a first position; FIG. 8 illustrates a perspective view of part of the ventilation device of FIG. 5 in a second position; FIG. 9 illustrates a perspective view of the ventilation device of FIG. 1 according to a second embodiment of the invention; FIGS. 10a and 10b illustrate a view of a tube of FIG. 9 according to two distinct perspectives; FIG. 11 illustrates a detailed perspective view of a part of a compression mechanism of the ventilation device of FIG. 9; and FIG. 12 illustrates a detailed perspective view of a driving rod of the ventilation device of FIG. 9.

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.

In the illustrated embodiments, the tubes 3 are divided into two rows 8-1 and 8-2.

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 31 (illustrated in FIG. 9), 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 with FIG.

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

As particularly visible in FIGS. 5 to 11, the ventilation device 1 comprises at least one sealing element 20 and an associated mechanism 40 for compressing the sealing element 20.

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

The compression mechanism 40 associated with each seal 20 makes it possible to seal the fluidic connection 30, preferably in the open position of the tubes, as will be detailed.

As is apparent from the figures, 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.

First Embodiment The invention is now described with reference to FIGS. 5 to 8.

According to this embodiment, each tube 3 has a circular section.

As can be seen particularly in FIG. 5, each seal 20 is disposed in one of the orifices 9 of the collector 5.

Each end 6 of the associated tube 3 at each orifice 9 comprises a ring 50 provided with at least one lug 51 protruding axially in the longitudinal direction L of the tube 3.

In the illustrated embodiment, the ring 50 is provided with two lugs 51 diametrically opposed.

As can be seen particularly in FIGS. 7 and 8, the ring 50 has a first height H1 in the portions without lug 51 and a second height H2, greater than the first height H1, in the portions with lug 51.

The compression mechanism 40 also comprises a part 52 intended to cooperate with the lugs 51.

The part 52 comprises a column 53 hollowed out of several housing 54 for receiving the ring 50.

Each housing 54 comprises a curved portion 55 on which the ring 50 of the associated tube 3 rests.

The diameter of the curved portion 55 corresponds to the diameter of the circular tube 3.

The curved portion 55 is preferably a semicircle.

Each housing 54 comprises a curved portion 56 adjacent to the curved portion 55 and extending between two ends 57.

The curved portion 56 has a smaller diameter than the curved portion 55, so that the housing 54 describes a shoulder 58 between the two curved portions 55 and 56, as can be seen in FIG.

Each end 57 comprises an insertion flange of an associated pin 51, referenced 58.

Each flange 58 has a height slightly less than the sum of the height H2 and the height H of the seal 20.

As can be seen in FIGS. 7 and 8, one of the seals 20 is installed in the periphery of the associated orifice 9, facing the ring 50 of the end 6.

In the closed position, illustrated in FIG. 7, the lug 51 is situated outside the rim 58.

In this position, the seal 20 is disposed at a distance from the ring 50.

In other words, there is an axial clearance between the seal 20 and the ring 50.

In the open position, illustrated in FIG. 8, the lug 50 is located in the flange 58.

In this position, the ring 50 compresses the seal 20 against the collector 5.

The operation of the ventilation device according to the first embodiment is now described.

In the closed position, the turbomachines are preferably at a standstill; no air is blown.

To activate the ventilation device 1, the turbomachines are put into operation.

The tubes 3 are pivoted around the longitudinal direction L from the closed position to the open position.

During the pivoting, because of the axial clearance between the seal 20 and the ring 50, the tube 3 pivots freely, without mechanical resistance, as long as the lug 51 is at a distance from the flange 58.

Then, when the lug 51 enters the flange 58, the ring 50 is pressed against the seal 20 which is then compressed against the collector 5, as already described.

In this position, there is no play and sealing is ensured.

Note that it is preferable that the actuator is powerful enough to pivot the tubes 3, including the end of stroke, when the mechanical strength becomes important because of friction of the tube 3 on the manifold 5 via the pins 51 .

Second Embodiment The invention is now described with reference to FIGS. 9 to 12.

As shown in Figures 9, 10a and 10b, each tube 3 has an oblong section.

This oblong shape ensures a better distribution of the air flow from the collector to the tubes.

In addition, with equal passage section, between a disk and an oblong hole, the oblong hole allows a denser stack of ejector tubes.

Each seal 20 has an oblong shape.

Similarly, each orifice 9 of the collector 5 has an oblong shape.

The tube 3 illustrated in FIGS. 10a and 10b comprises a body 60 extending between two opposite short edges 61, 62 and two opposite long edges 63, 64.

The short edge 61 corresponds to the open end 6 of the tube 3 and comprises the inlet 65 of the air in the tube 3 via the associated orifice 9 of the manifold 5. The inlet 65 of the short edge 61 is oblong, shaped to press the seal 20 against the manifold 5 via the compression mechanism 40, described later.

As is also apparent from Figures 10a and 10b, the tube 3 comprises three axes for moving the tube 3 between the open and closed positions.

A first axis 66 is disposed in the short edge 61 and forms a vertex between the short edge 61 and the long edge 63.

The first axis 66 is adjacent to the inlet 65 of the tube 3.

The first axis 66 comprises a rod projecting axially along the longitudinal direction L towards the collector 5.

A second axis 68 is carried by the short edge 62 and forms a vertex between the short edge 62 and the long edge 63.

The second axis 68 comprises a rod projecting axially along the longitudinal direction L to a part 70 of the compression mechanism, described below.

Thus, the first two axes 66, 68 are substantially aligned with the long edge 63 along the longitudinal direction L.

As seen in FIGS. 10a and 10b, the compression mechanism of the seal comprises three pins 71 projecting axially off the second axis 68.

The angular distance between two adjacent pins 71 is chosen to correspond to a stroke of the tube 3 from one of the open or closed positions of the tubes to the other closed or open positions of the tubes.

In the embodiment illustrated in FIGS. 8 to 12, two adjacent pins 71 are angularly separated by an angle of the order of 60 °.

A third axis 72 is carried by the short edge 62, preferably in the middle of the short edge 62.

The third axis 72 is intended to cooperate with a driving rod 73, described later.

The third axis 72 comprises a rod projecting axially along a longitudinal direction parallel to the direction L, towards the part 70.

As already indicated, the compression mechanism 40 comprises the part 70 intended to cooperate with the pins 71.

As can be seen in FIG. 11, the part 70 comprises a plurality of housings 74.

Each housing 74 is shaped to receive the second axis 68 of the associated tube 3.

Each housing 74 comprises three cavities 75 for inserting one of the pins 71 of the second axis 68.

Two adjacent cavities 75 are angularly spaced from one another in a manner similar to the spacing between the two pins 71 with which they cooperate.

Thus, in the embodiment illustrated in FIG. 11, two adjacent cavities 75 are angularly separated by an angle of the order of 60 °.

The part 70 comprises a first part 76 in the form of a column and comprising the housings 74 arranged one below the other.

The part 70 also comprises a second elongate part 77 parallel to the first part 78.

The first part 76 and the second part 77 are connected to one another by two joining parts 78. The space 79 delimited between the parts 76, 77 and the two parts 78 is free, so that the connecting rod 76 training 73 can move in space 79.

In the closed position, each pin 71 is located outside the cavities 75.

In this position, the seal 20 is disposed at a distance from the short edge 61 of the tube 3.

In other words, there is an axial clearance between the seal 20 and the tube 3.

In the open position, each pin 71 is located in one of the cavities 75.

In this position, the short edge 61 compresses the seal 20 against the collector 5.

As shown in Figure 12, the drive rod 73 comprises a bar substantially rectilinear.

The connecting rod 73 also comprises a plurality of control elements 81, each control element 81 being shaped to cooperate respectively with the third axis 72 of one of the tubes 3, respectively.

In the embodiment of Figure 12, each control element 81 has a generally cylindrical shape.

A slot allows the passage of the bar 80, the bar 80 dividing the cylinder into two portions, 82 and 83.

The portion 82 is intended to accommodate the second axis 68 of one of the tubes 3 of the row 8-1 while the portion 83 is intended to accommodate the second axis 68 of one of the tubes 3 of the adjacent row 8. 2.

An opening 84 of the portion 82 and an opening 85 of the portion 83 allow the insertion of the second axis 68 associated.

The tubes 3 of two adjacent rows are integral in motion of the driving rod 73, one of the second pins 68 being positioned in one of the portions 82, 83.

The ventilation device 1 also comprises an actuator 86 for moving the driving rod 73.

The operation of the ventilation device according to the second embodiment is now described.

In the closed position, the turbomachines are preferably at a standstill; no air is blown.

To activate the ventilation device 1, the turbomachines are put into operation.

The tubes 3 are pivoted about the longitudinal direction L from the closed position to the open position.

To do this, the actuator 86 prints a vertical translational movement to the driving rod 73.

The second pins 68 being fitted into the cylinders of the connecting rod, each of the tubes 3 pivots by their first, second and third axes, towards the open position.

During pivoting, because of the axial clearance between the seal 20 and the short edge 61, the tube 3 pivots freely without mechanical resistance, as long as the pins 71 are at a distance from the cavities 75.

Thus, thanks to the compression mechanism of the ventilation device 1 according to the present invention, it is possible to ensure the sealing of the fluidic connections when the ventilation device blows air while avoiding any friction during the pivoting of the tubes. between the open and closed positions. 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.

Claims (5)

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) of 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, the ventilation device (1) being configured to allow more air to enter the open position than in the closed position, - at least one air manifold (5) for distributing air to at least a portion of the tubes (3), said at least one manifold of air (5) comprising an orifice (9) for receiving 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 orifice for receiving (9) so as to form a fluid connection (30) between said at least one manifold (5) and said tubular e (3), - a sealing member (20) for sealing said fluidic connection (30), and - a compression mechanism (40) for the sealing member (20). 2. Ventilation device according to the preceding claim, wherein the compression mechanism (40) comprises a ring (50) of the end (6) of the steerable tube (3) and provided with a lug (51) projecting axially. in a longitudinal direction of the at least one orientable tube (3). 3. Ventilation device according to the preceding claim, wherein the compression mechanism (40) comprises a housing (54) for receiving the ring (50) of the steerable tube (3). 4. Ventilation device according to the preceding claim, wherein the housing (54) for receiving the ring (50) comprises a flange (58) for insertion of the lug (51). 5. Ventilation device according to one of claims 3 or 4, comprising a part (52) carrying a plurality of receiving housings (54), each receiving housing (54) being provided with an insertion flange (58). ). 6. Ventilation device according to one of the preceding claims, wherein the sealing member (20) is a seal of circular section. 7. Ventilation device according to claim 1, wherein the compression mechanism (40) comprises at least one pin (71) projecting axially out of an axis of rotation (68) of the steerable tube (3). 8. Ventilation device according to the preceding claim, wherein the compression mechanism (40) comprises at least two pins (71) projecting axially out of the axis of rotation (68) of the steerable tube (3), an angular distance. between two adjacent pins (71) corresponding to a stroke of the steerable tube (3) from one of the open or closed positions to the other of the closed or open positions. 9. Ventilation device according to one of claims 7 or 8, wherein the compression mechanism (40) comprises at least one cavity (75) for receiving a pin (71). 10. Ventilation device according to the preceding claim, wherein the compression mechanism (40) comprises a part (70) carrying a plurality of cavities (75) for receiving a pin (71). 11. Ventilation device according to one of claims 7 to 10, wherein the sealing element (20) is an oblong section seal. 12. 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). 13. 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 allow a flow of air to circulate. air in open position. 14. 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). 15. 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.