WO2021084179A1

WO2021084179A1 - Porous wall, and corresponding heating and/or ventilation and/or air-conditioning system housing

Info

Publication number: WO2021084179A1
Application number: PCT/FR2020/051803
Authority: WO
Inventors: Clément ESCULIER; Alexis PIGEON; Cyril Gontier; Yves Rousseau
Original assignee: Valeo Systemes Thermiques
Priority date: 2019-10-29
Filing date: 2020-10-13
Publication date: 2021-05-06
Also published as: FR3102546A1; DE112020005216T5

Abstract

The invention relates to a wall (25) made of porous material and configured to be assembled to a corresponding structure, in particular of a housing of a motor vehicle system for the heating and/or ventilation and/or air-conditioning of a stream of air, According to the invention, the wall (25) comprises at least one first region (Z1) and one second region (Z2), which is compressed with respect to the first region (Z1), the second region (Z2) being arranged at least in part at the edge of the wall (25), and the second, compressed region (Z2) comprises at least one assembly interface configured to be assembled to the corresponding structure. The invention also relates to a corresponding housing comprising such a wall (25).

Description

POROUS WALL AND CORRESPONDING HEATING AND / OR VENTILATION AND / OR AIR CONDITIONING INSTALLATION BOX

The present invention relates to the field of heating, ventilation and / or air conditioning systems for the passenger compartment of a motor vehicle, also referred to as HVAC for "Heating, Ventilation and Air-Conditioning" in English. The invention relates more particularly to a wall made of porous material for a housing of such an installation, and a corresponding housing.

Motor vehicles are commonly equipped with a ventilation, heating and / or air conditioning installation of an air flow to regulate the aerothermal parameters of the air flow intended to be distributed towards the interior of the passenger compartment of the motor vehicle.

[0003] Such an installation comprises a housing generally delimited by partitions and having at least one air inlet and at least one air outlet. The housing houses an air blower to circulate the air flow from the air inlet to the air outlet.

[0004] The housing also generally houses heat treatment devices, such as heat exchangers, to heat and / or cool the air flow prior to its distribution inside the passenger compartment.

The air flow pressurized by the air blower is routed to the heat exchanger (s) before being distributed into the passenger compartment via outlet or distribution outlets, opening into different areas of the interior.

[0006] Such housings are usually made of plastic and are generally formed of two half-housings thus defining an internal volume, the heat exchangers and the air blower being arranged between the two half-housings.

[0007] However, in order to be able to withstand the heat exchangers, the structure of such housings must be sufficiently strong and be of relatively high thickness, generally made of rigid plastic.

[0008] However, during operation of the installation, significant noise may be generated within it, both due to the movement of the air flow in the ducts and to the activity of the blower. This noise can propagate into the passenger compartment, in particular via the outlet openings of the unit. This then represents a noise nuisance for the occupants of the motor vehicle. In order to overcome this problem, solutions of the state of the art consist in increasing the thickness of the internal walls of G installation so that the latter can absorb part of the sound emissions before they reach the vents. of distribution. However, these solutions have the drawback of involving a significant increase in the mass of the installation and therefore an increase in the energy consumption of the vehicle which is equipped with it.

[0010] According to another known solution, the installation comprises at least one wall made of a porous material placed at an opening in the structure of the housing, to ensure better noise reduction while reducing the weight of the installation. . The connection between such a wall of porous material and the structure of the housing is effected by overmolding the material of the perforated structure of the housing on the wall of porous material.

[0011] It is therefore necessary to take into account the problems associated with injection for this bonding by overmolding, which can only be done before the assembly of the housing and all of the elements that it receives. This assembly cannot therefore be carried out in a simple manner on an assembly line of a heating and / or ventilation and / or air conditioning installation for a motor vehicle.

[0012] Furthermore, it is necessary to ensure, at the level of the wall made of porous material filling an opening in the structure of the housing, sufficient resistance to torsional and bending forces when using the housing.

Another problem is to manage the constraints of sealing and holding in position at the junction between such a wall of porous material and the structure of the housing.

The object of the invention is to at least partially overcome these problems of the prior art by providing a wall made of porous material intended to be assembled in a simple manner on a structure for example of a heating installation box and / or ventilation and / or air conditioning, while limiting the impact on the configuration of the box.

Another objective of the invention is also to provide airtightness between the junction of this wall and the structure receiving it.

Yet another objective is to keep a certain rigidity of the wall made of porous material to withstand the forces in operation of the heating and / or ventilation and / or air conditioning installation. To this end, the invention relates to a wall of porous material configured to be assembled on a corresponding structure, in particular of a housing of a heating and / or ventilation and / or air conditioning installation of a flow. air for motor vehicles. According to the invention, the wall comprises at least a first zone and a second zone compressed with respect to the first zone, the second zone being arranged at least in part at the edge of the wall. The second compressed zone can extend over the entire border of the wall. This second compressed zone comprises at least one assembly interface configured to be assembled on the corresponding structure.

[0018] It is thus possible to add the wall or walls made of porous material on an assembly line, at the level of openings of a perforated structure of the housing. The walls thus form patches which close off the openings of the housing.

This assembly can be done after assembling the housing with the various elements it contains such as shutters, heat exchange devices, an air blower.

The wall may further include one or more of the following characteristics described below, taken separately or in combination.

[0021] According to one aspect of the invention, said at least one assembly interface is shaped for assembly by complementarity of shape with an associated assembly member of the corresponding structure.

[0022] The walls can be simply attached to the housing and the assembly can be done without problems associated with injection for the overmolding of the structure on such walls.

[0023] According to a particular example, the assembly interface can be curved or bent so as to define a groove intended to accommodate the associated assembly member produced in the form of a tongue.

Advantageously, the assembly interface is configured to cooperate with the associated assembly member according to a tight assembly, so as to ensure that the wall according to the invention is held in position on the structure receiving it. while ensuring an airtight junction. According to another aspect, said at least one assembly interface comprises at least one fixing element configured to cooperate with a complementary fixing element on the corresponding structure.

[0026] The complementary fastening element is advantageously carried by the assembly member defined above.

[0027] According to a particular example, the fixing of the assembly interface to the structure is intended to be done by snap-fastening. The assembly interface has, for example, one or more openings into which complementary ratchet teeth carried by the assembly member of the structure are intended to engage. This ensures that the or each patch is held in position on the housing after snap-fastening.

[0028] According to an exemplary embodiment, the wall comprises at least two first zones and in which the second compressed zone extends between the two first zones.

The first two zones may or may not be of the same thickness.

The wall advantageously has a flat face.

Said at least one assembly interface can be formed on the edge of the wall and / or between two first zones.

The second compressed zone has for example a volume between six and eight times less than the volume of the first zone.

[0033] According to a particular example, the first zone has a thickness of the order of 3.5mm to 4mm. The second area can be anywhere from 0.3mm to 1.5mm thick. Preferably, the thickness of the second zone is on the order of 0.9mm.

[0034] According to yet another aspect of the invention, the second compressed zone is obtained by thermoforming the wall. When heated, the second zone stiffens. This ensures good sealing of the wall attached to the housing. It is no longer necessary to make additional molding or adding material to ensure that it is held in position on the housing.

Advantageously, the second zone has a stiffening mesh.

The mesh may have one or more stiffening ribs, the mesh may be in particular in the form of a grid, of a honeycomb, or in the form of a cross, or any other reason. This makes it possible to structure and locally stiffen the wall without requiring an additional supporting frame or grid attached and fixed to the wall.

[0037] The mesh can be obtained by heating and crushing the second zone of the wall according to the invention. The mesh is for example printed in the thermoforming mold.

The fibers of the material when heated agglomerate, making it possible to obtain a material similar to plastic.

[0039] According to a preferred embodiment, the porous material is a mixture of poly (ethylene terephthalate) and polypropylene.

The porosity of the porous material is for example greater than 0.8.

The diameter of the pores is between 10 pm and 100 pm.

The invention also relates to a housing, in particular for an installation for heating and / or ventilation and / or air conditioning of an air flow, comprising a perforated structure having at least one opening, and at least one wall such that defined above covering said at least one opening.

[0043] The wall made of porous material reduces noise pollution while allowing for a lighter structure of the housing.

According to one aspect of the invention, the structure comprises at least one assembly member on a periphery delimiting said at least one opening, and said at least one wall covers said at least one opening, so that said at least an assembly interface cooperates with said at least one assembly member. This allows a tight assembly.

A wall assembly interface and a complementary assembly member on the housing structure are for example shaped for a tongue-and-groove assembly. The wall assembly interface can be shaped to define a groove and the complementary assembly member of the structure can have a complementary tongue shape.

The invention also relates to a heating and / or ventilation and / or air conditioning installation for an air flow comprising a housing as defined above. Other advantages and characteristics of the invention will emerge more clearly on reading the following description given by way of illustrative and non-limiting example, and the appended drawings, among which:

[0048] [Fig. 1] is a side view of a housing of a heating, ventilation and / or air conditioning installation comprising a wall made of porous material according to the invention.

[0049] [Fig. 2] is a side view of a wall made of porous material.

[0050] [Fig. 3] is a perspective view of the wall made of porous material in FIG. 2.

[0051] [Fig. 4] is a partial view of a wall of porous material provided with an assembly interface.

[0052] [Fig. 5] shows in more detail the assembly interface of Figure 4 provided with a snap-fit fastener.

[0053] [Fig. 6] shows a portion of the structure of the housing of Figure 1, comprising an assembly member provided with a snap fastening element complementary to that of the assembly interface of Figure 5.

[0054] [Fig. 7] is a side view showing the assembly interface of the porous material wall of Figure 4 assembled with the assembly of the housing structure of Figure 6.

[0055] [Fig. 8] is a sectional view at the level of the fasteners of the assembly of Figure 7.

In these figures, identical elements bear the same reference numbers.

The following embodiments are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference relates to the same embodiment, or that the characteristics apply only to one embodiment. Simple features of different embodiments can also be combined or interchanged to provide other embodiments.

In the description, certain elements can be indexed, such as for example first element or second element. In this case, it is a simple indexing to differentiate and name similar elements but not identical. This indexing does not imply a priority of one element over another and we can easily interchange such names without departing from the scope of the present description. This indexation does not imply an order in time either.

Referring to Figure 1, the invention relates to a heating and / or ventilation and / or air conditioning installation 1, in particular for a motor vehicle. Figure 1 is a side view of such an installation 1.

[0060] Installation 1 comprises a housing 3 with at least one air inlet and one air outlet. The housing 3, in particular the partitions or walls of the housing 3, defines an air channel 5 in which flows an air flow intended to be heat treated and to be sent into the passenger compartment of the motor vehicle.

The housing 3 can accommodate various elements of the installation 1 described below.

Installation 1 comprises an air blower 7, also called a motor-fan unit or under the English name blower. The air blower 7 can be housed in a volute of the housing 3. An air flow L coming from the outside or from the interior of the vehicle, can be sucked in by the air blower 7, and conveyed within housing 3.

The installation 1 further comprises one or more heat treatment devices such as heat exchangers 9, 11, 13, to heat and / or cool the air flow L prior to its distribution in the vehicle interior. automobile. For example, heat exchangers can include an evaporator 9, a radiator 11, and possibly an additional electric radiator 13.

One or more flaps 15 are generally arranged in the housing 3 so as to distribute or mix one or more air flows at the outlet of one or more of the heat exchangers 9, 11, 13.

The housing 3 comprises one or more air outlet vents 17, 19, for example for defrosting / demisting or ventilation, opening into one or more parts or areas of the passenger compartment.

The housing 3 comprises distribution ducts 21, 23 for directing and conveying the air flow L having passed through one or more of the heat exchangers 9, 11, to the outlet ports 17, 19 .

Furthermore, the housing 3 can be formed by two half-housings. In addition, the housing 3 comprises a perforated structure 30 having one or more openings 32. The arrangement of the opening 32 as shown diagrammatically in FIG. 1 is by way of illustration and can be provided at any other location. adequate.

In particular, the perforated structure 30 may be provided at the level of a so-called distribution part of the housing 3 housing the heat exchangers 9, 11, 13. As an alternative or in addition, the perforated structure 30 may also be provided at level of the volute housing the blower 7 and / or a diverging part of the housing 3 between the volute outlet and the distribution part.

The perforated structure 30 corresponds to a frame made of a first material. The first material is a rigid material in order to be able to resist torsional and bending forces. The first material is chosen so as to reinforce the perforated structure 30 according to the number of openings 32.

The first material is generally plastic or thermoplastic. In a nonlimiting manner, it may be, for example, polypropylene loaded with 20% Talc (PP T 20), polypropylene loaded with 40% talc (PP T 40), or even polypropylene loaded with glass fibers. 30% (PP GP 30).

The openings 32 are judiciously placed to reduce noise pollution. At the level of the distribution part, the openings 32 are advantageously provided on the circulation path of the air flow P, outside the heat exchangers 9, 11, 13. The openings 32 can in particular be provided near the outlets of air, that is to say outlets 17, 19.

The openings 32 make it possible to avoid having the first rigid material on the areas of the housing 3 where sound absorption is desired.

The housing 3 further comprises at least one wall 25 arranged at a corresponding opening 32 of the perforated structure 30, so as to fill, cover this opening 32.

The overall shape of the wall 25 is a function of the opening 32 of the perforated structure 30 that the wall 25 must fill. The wall 25 has a general shape complementary to that of the corresponding opening 32. In the very schematic example of FIG. 1, the wall 25 has the shape of a plate to fill a rectangular opening 32. Of course, any other form can be considered. The wall 25 is made of a second material, porous, allowing sound insulation to absorb noise pollution due to the circulation of the air flow F in the installation 1.

The second porous material of the wall 25 is different from the first material of the perforated structure 30. The term “different materials” means materials of different compositions.

In general, the porous material of the wall 25 is more flexible than that of the perforated structure 30.

[0079] The porous material is an acoustic insulation material, that is to say its objective is to reduce noise pollution. Such a material is chosen on the basis of its sound absorption properties. In particular, the thicker the material, the better the sound absorption properties. The sizing of the second material is made according to a compromise between a thickness which makes it possible to improve sound absorption and a thickness which is homogeneous with the rest of the architecture of the housing 3 and of the installation 1.

The wall 25 is particularly suitable for attenuating acoustic waves whose frequency is between 20 Hz and 20 kHz, which improves the acoustic comfort in the passenger compartment of the vehicle by reducing the noise generated within the installation 1.

[0081] The porous material can also be chosen as a function of elasticity, ductility, tensile stresses.

[0082] The porous material has a structure characterized by the presence of a plurality of open and / or closed pores. Due to its porous nature and its mechanical flexibility, such a material forms a good sound insulator, or in other words a good soundproofing means or a good sound absorption means. It is therefore able to limit the propagation of acoustic waves in the installation's ducts. The noise reduction applies not only to the high frequencies, but also to the low frequencies generated by the structure modes of the installation.

The degree of porosity of the second material is established as a function of requirements. The porosity of the porous material is for example greater than 0.8. Porosity is the ratio of the pore volume to the total volume of a porous medium. Porosity greater than 0.8 represents a favorable condition for obtaining a wall 25 exhibiting better noise reduction and great flexibility.

According to an exemplary embodiment, the diameter of the doors can be between 10 pm and 100 pm.

The porous material can be a material or a mixture of materials. It may in particular comprise a foam, a non-woven material, a material woven for example with rock wool or even any polymer having or not having glass fibers or hemp fibers, polypropylene, in particular unfilled polypropylene, polyurethane, polyethylene.

The porous material advantageously comprises polypropylene, known by the acronym PP, optionally mixed with another material. Polypropylene has the advantage of being light, while having satisfactory mechanical resistance in view of its use.

According to a particular nonlimiting embodiment, the porous material is a mixture of poly (ethylene terephthalate) (also called polyethylene terephthalate) known by the acronym PET, and polypropylene PP.

[0088] In addition, the wall 25 may or may not be airtight as well as the wall 25 may also be watertight or not. An additive or a skin can be provided on the layer of porous material.

The wall 25 is intended to be assembled and secured to the perforated structure 30.

This wall 25, better visible in Figures 2 and 3, comprises at least a first zone ZI and at least a second zone Z2 compressed with respect to the first zone ZI.

Advantageously, the wall 25 has a flat face. This flat face is intended to be oriented towards the inside of the duct or air channel defined by the housing. This is the lower face with reference to the orientation of the wall 25 in FIG. 2. This makes it possible to avoid creating asperities and air vortices unlike a wall 25 which is not uniformly flat. .

The wall 25 can be formed by at least one layer of porous material, compressed at least at the level of the second zone Z2. The first zone ZI can be an uncompressed zone of the wall 25 and only the second zone Z2 is compressed. Alternatively, the zones ZI and Z2 can be compressed according to indices of different compression so that the second zone Z2 is more compressed than the first zone Z1. The second zone Z2 is also called hereafter second compressed zone Z2.

The compression makes it possible to stiffen the second zone Z2, sufficiently to ensure an assembly function on the corresponding structure 30, detailed below.

The compression depends on the flexibility of the second material. In general, the more flexible the porous material, the more it may be necessary to reduce the thickness of the second zone Z2.

The compression has the effect, for example, of reducing the volume at the level of the second zone Z2 between six and eight times relative to the volume of the first zone Z1.

For example, the first zone Z1 can have a first thickness e1 of the order of 3.5mm to 4mm. The second compressed zone Z2 may have a second thickness e2 of the order of 0.3mm to 1.5mm, in particular of the order of 0.9mm. This is particularly valid for the example of a wall 25 made of a PET PP mixture of polyethylene terephthalate and polypropylene.

In addition, the second compressed zone Z2 is arranged at least partly on the edge of the wall 25. The second compressed zone Z2 preferably extends over the entire edge of the wall 25. In other words, the second compressed zone Z2 is arranged at least in part on the periphery or on the periphery of the wall 25.

The wall 25 can include several first zones Z1 separated by a second zone Z2. The various first zones Zl can be of the same thickness el. Alternatively, the different first zones Z1 can be of different thicknesses while remaining greater than the thickness e2 of the second zone Z2.

As a variant or in addition, the wall 25 can comprise several second zones Z2 of the same thickness e2.

[0100] In the example illustrated, the wall 25 comprises two first zones Zl and the second compressed zone Z2 forming the edge of the wall 25 also extends between the first two zones Zl.

The second compressed zone Z2 can be obtained during a thermoforming of the wall 25. The shaping of the wall 25 with the different zones Zl, Z2 can be done by the imprint of a mold, such as 'a stamping mold. [0102] For example, in the initial state, the wall 25 may have an initial general planar shape, for example a planar plate shape. The plate can be thermoformed. To do this, it can be heated in its entirety beforehand, for example to a temperature of between 170 ° C and 220 ° C, and more precisely around 180 ° C or 190 ° C, before being placed in the mold. The plate is therefore hot, and the mold is closed by locally crushing the material to the right of the second zone Z2, for example on the edge or periphery of the wall 25 and potentially in the middle according to the example of FIGS. 2 and 3. The fibers of the porous material when they are heated agglomerate and this makes it possible to obtain a material comparable to rigid plastic. During compression, the mold cools the material a little. When the mold is opened, the material has cooled and assumed the desired permanent shape, thinned and stiffened at the level of the second zone Z2.

Advantageously, the second zone Z2 has a structuring or stiffening mesh (not shown in the figures). This mesh can have one or more stiffening ribs or a network of ribs. It may in particular be in the shape of a grid, a honeycomb, or in the shape of a cross, or any other suitable shape.

The mesh can be obtained during the thermoforming of the wall 25, by heating and by crushing the second zone Z2. The shape of the mesh is for example printed in the mold.

[0105] Such a mesh makes it possible to structure and locally stiffen the wall 25. In this case, it is no longer necessary to add an additional grid on the housing at the level of the wall 25, as according to certain solutions of the prior art. Thus, during operation of the heating and / or ventilation and / or air conditioning installation, in the event of pressure in the box provided with such a wall 25, the forces pass through the wall 25 which can withstand, because of this. mesh. This prevents the wall 25 from swelling due to the pressure in the housing.

[0106] The wall 25 further comprises one or more assembly interfaces at the level of the second compressed zone Z2. An exemplary embodiment of such an assembly interface 27 is illustrated in FIG. 4. The shaping of the assembly interface 27 is provided to adapt to the shape of the housing, in particular around the housing. opening that the wall 25 is intended to cover. The assembly interface 27 is configured to be assembled on the corresponding structure, for example of the heating and / or ventilation and / or air conditioning installation box previously described with reference to FIG. 1.

[0108] In addition, this assembly interface 27 is advantageously produced, for example during the thermoforming of the wall 25, so as to guarantee a seal at the level of the junction of the wall 25 and of the corresponding structure accommodating such a wall. 25.

[0109] The assembly interface 27 can be formed at the edge of the wall 25 as in the example illustrated. As a variant or in addition, one could envisage an assembly interface 27 formed at the level of one or the second compressed zone Z2 which extends between two first zones Z1.

[0110] The assembly interface 27 is intended to be assembled on the structure by cooperating with an associated assembly member provided on the structure. Advantageously, this cooperation takes place by a simple mechanical assembly that does not require an additional overmolding or other step.

[0111] With particular reference to FIGS. 5 and 6, the assembly interface 27 may be shaped for assembly by complementarity of shape with the assembly member 34 associated with the corresponding structure 30, for example of the housing. 3 previously described.

[0112] In the example illustrated, the structure 30 of the housing 3 comprises such an assembly member 34 on a periphery defining an opening 32 intended to be filled in by a wall 25.

[0113] The assembly interface 27 of the wall 25 and the assembly member 34 associated with the structure 30 of the housing 3 are for example intended to be assembled in a tongue-and-groove assembly.

To this end, the assembly interface 27 of the wall 25 can be shaped to delimit a groove 29. The associated assembly member 34 may have the general shape of a tongue complementary to the shape of the groove 29. This form of tongue is intended to engage in the groove 29 when the wall is assembled on the structure 30.

To do this, the assembly interface 27 of the wall 25 can be bent or bent so as to delimit the groove 29 between two opposite internal faces 271 of the assembly interface 27. [0116] The groove 29 may have a flared shape. The groove 29 has, for example, a section in the general shape of a "V", the branches of the "V" shape having the internal faces 271 opposite. The "V" shape is reversed with respect to the orientation of the elements in Figure 5. The "V" shape has a bottom 273, at the top in Figure 5, which can be rounded. The internal faces 271 can be inclined with respect to one another so as to form an angle α between them. According to a particular non-limiting example of embodiment, the angle a between the two internal faces 271 can be around 12 °. In addition, in the particular example illustrated, the branches of the "V" shape are not of the same length.

[0117] Complementary to the particular example of groove 29 above with reference to Figure 5, the assembly member 34 as shown in Figure 6, may have a flared shape. The assembly member 34 has in this example a section of generally triangular or quasi-triangular shape. The triangular shape may have a top 343, which may be rounded, intended to come opposite the bottom 273 of the "V" shape of the groove 29. The assembly member 34 has in this example two slopes 341 forming between they have an angle b slightly greater than the angle a between the two internal faces 271 of the assembly interface 27. By slightly greater is meant that the difference in angle allows a force-mounting of the assembly member 34 in the groove 29, so as to ensure that the wall 25 is held in position on the structure 30. According to a particular non-limiting embodiment, the angle b can be around 13 °. Similar to the branches of the "V" of the groove 29, the slopes 341 may not be of the same length.

[0118] In addition, the assembly interface 27 is advantageously shaped so as to be fixed on the structure 30, in particular on the associated assembly member 34.

The assembly interface 27 therefore comprises one or more fastening means or elements 275 respectively intended to cooperate with a complementary fastening element 345 on the structure 30, more precisely on the associated assembly member 34.

[0119] According to a particular example, the fixing of the assembly interface 27 on the structure 30 is intended to be done by snap-fastening. To this end, the complementary fixing elements 275, 345 may be one or more openings and one or more latching teeth carried on the one hand by the assembly interface 27 and on the other hand by the assembly member 34 on the structure 30. One can also speak of an elastic deformation.

[0120] The assembly interface 27 has, for example, the openings 275 in which complementary latching teeth 345 carried by the assembly member 34 are intended to engage. Conversely, it can be envisaged that the or the latching teeth are arranged on the assembly interface 27 of the wall 25 and that the complementary openings are provided on the structure 30.

[0121] Other additional fixing means or elements can be envisaged, for example without limitation for fixing by screwing or fixing by slide link.

[0122] On assembly, as shown in FIG. 7, the wall 25 is arranged so as to fill the opening 32 at the level of the structure 30, and the assembly interface 27 of the wall 25 cooperates with the assembly member 34 of the structure 30. The tongue shape fits into the groove 29, the slopes 341 of the tongue exerting pressure against the internal faces 271 delimiting the groove 29, so that the tongue is held clamped in groove 29.

[0123] Other complementary assembly means carried on the one hand by the structure 30 and on the other hand by the wall 25 that the previously described tongue-and-groove means may be provided, such as, for example, not exhaustively a additional drawer system.

In addition, as shown diagrammatically in FIG. 8, the latching tooth (s) 345, provided in the example illustrated on the side of the structure 30, engage in a complementary opening 275 provided in this example on the wall. 25. This ensures that the or each wall 25 is held in position on the structure 30 of the housing after snap-fitting. It is not necessary to overmold or add material to ensure that the wall 25 attached to the housing 3 is held in position.

[0125] Each wall 25 thus forms a patch assembled and fixed in a simple manner on the structure 30 in order to cover an opening 32. In addition, the structure of the interface 27 can be likened to a plasticized structure due to the compression of the second zone. Z2 ensures the seal at the junction of the wall 25 and the structure 30 of the housing 3. The assembly is therefore sealed. [0126] Depending on requirements, it is possible to envisage increasing the tightness of the assembly, for example by adding a seal such as an O-ring (not shown) between the assembly interface 27 and the assembly member 34.

[0127] Thus, the structure 30 of the housing 3, for example in two half-housings, can be formed with a predefined number of carefully placed openings 32. The various elements that the housing 3 contains, such as the air blower 7, the heat exchangers 9, 11, 13, the flaps 15, can be arranged in this structure 30.

[0128] One or more walls 25 of porous material can be worked to form the assembly interface 27 allowing assembly on the housing 3. These walls 25 can then be added at the level of the openings 32 of the housing 3, on a assembly line, for example after having assembled the box 3 and the elements it contains. Thanks to the cooperation between the assembly interface 27 and the assembly member 34 of the structure 30, the wall 25 closes an opening 32 of the structure 30 without requiring any additional step or part. The porous material of the wall 25 makes it possible to absorb noise pollution due to the circulation of the air flow in the installation 1.

[0129] It is understood that the present invention is in no way limited to the embodiment described above. In particular, the invention cannot be limited to the tongue-and-groove assembly exclusively described for a particular exemplary embodiment. The invention also applies to any other embodiment or equivalent making it possible to position and hold in position a wall 25 made of porous material on the housing 3, or even to ensure a seal at the level of this assembly.

Claims

[Claim 1] Wall (25) of porous material configured to be assembled on a corresponding structure (30), in particular of a housing (3) of an installation (1) for heating and / or ventilation and / or air conditioning of an air flow for a motor vehicle, characterized in that:

- the wall (25) comprises at least a first zone (Zl) and a second zone (Z2) compressed with respect to the first zone (Zl), the second zone (Z2) being arranged at least partly on the edge of the wall (25), and in that

- the second compressed zone (Z2) comprises at least one assembly interface (27) configured to be assembled on the corresponding structure (30).

[Claim 2] A wall (25) according to the preceding claim, in which said at least one assembly interface (27) is shaped for assembly by complementarity of shape with an assembly member (34) associated with the structure (30). ) corresponding.

[Claim 3] A wall (25) according to one of the preceding claims, wherein said at least one assembly interface (27) comprises at least one fixing element (275) configured to cooperate with a fixing element (345) complementary to the corresponding structure (30).

[Claim 4] Wall (25) according to one of the preceding claims, comprising at least two first zones (Zl) and in which the second compressed zone (Z2) extends between the two first zones (Zl).

[Claim 5] Wall (25) according to one of the preceding claims, in which the compressed second zone (Z2) has a volume between six and eight times smaller than the volume of the first zone (Zl).

[Claim 6] Wall (25) according to the preceding claim, in which the first zone has a thickness (el) of the order of 3.5mm to 4mm, and the second zone has a thickness (e2) of the order of 0.3mm to 1.5mm.

[Claim 7] Wall (25) according to one of the preceding claims, in which the second zone (Z2) has a stiffening mesh.

[Claim 8] A wall (25) according to one of the preceding claims, in which the porous material is a mixture of poly (ethylene terephthalate) and polypropylene.

[Claim 9] Housing (3), in particular for an installation (1) for heating and / or ventilation and / or air conditioning of an air flow, comprising a perforated structure (30) having at least one opening (32), characterized in that it comprises at least one wall (25) according to one of the preceding claims covering said at least one opening (32).

[Claim 10] Housing (3) according to the preceding claim, in which the structure (30) comprises at least one assembly member (34) on a periphery delimiting said at least one opening (32), and in which said at least a wall (25) covers said at least one opening (32), so that said at least one assembly interface (27) cooperates with said at least one assembly member (34).