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EP3619068A1 - Porous air inlet duct for a hvac system - Google Patents

Porous air inlet duct for a hvac system

Info

Publication number
EP3619068A1
EP3619068A1 EP18725576.5A EP18725576A EP3619068A1 EP 3619068 A1 EP3619068 A1 EP 3619068A1 EP 18725576 A EP18725576 A EP 18725576A EP 3619068 A1 EP3619068 A1 EP 3619068A1
Authority
EP
European Patent Office
Prior art keywords
air
wall
thermal conditioning
installation
flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18725576.5A
Other languages
German (de)
French (fr)
Inventor
Julien Brault
Cédric Van Schammelhout
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Systemes Thermiques SAS
Original Assignee
Valeo Systemes Thermiques SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valeo Systemes Thermiques SAS filed Critical Valeo Systemes Thermiques SAS
Publication of EP3619068A1 publication Critical patent/EP3619068A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00507—Details, e.g. mounting arrangements, desaeration devices
    • B60H1/00514—Details of air conditioning housings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00507—Details, e.g. mounting arrangements, desaeration devices
    • B60H1/00557—Details of ducts or cables
    • B60H1/00564—Details of ducts or cables of air ducts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00507—Details, e.g. mounting arrangements, desaeration devices
    • B60H2001/006—Noise reduction

Definitions

  • HVAC heating, ventilation and / or air conditioning of the passenger compartment of a motor vehicle
  • HVAC heating, ventilation and / or air conditioning of the passenger compartment of a motor vehicle
  • Vehicle thermal conditioning installations by capturing outside air to distribute it within the passenger compartment, play a decisive role in heating, air conditioning and defogging the windows of the passenger compartment.
  • These relatively large installations are designed to be installed in the engine compartment of the vehicle, under the dashboard.
  • a thermal conditioning installation 1 typically comprises an air intake unit 2 having an external air intake inlet 2b, intended to draw air taken from the outside of the vehicle, and an intake of indoor air intake 2a, for reconditioning air from the passenger compartment of the vehicle.
  • the outside air inlet 2b may alternatively be oriented towards the basement space of the vehicle or towards the lower part of the windshield. In the second case, it is typically connected to an air filter and a separator whose function is to separate the rainwater from the air taken outside, below the windshield.
  • the upper wall of the spiral volute casing 4a is substantially flat and comprises at its center an axial suction port for communicating with the intake duct 3.
  • the volute casing 4a is substantially coaxial with the axis. of the blower 4, although the lower end of its side wall forms a spiral of increasing radius, adapted to gradually guide the flow of air to a tangential exhaust opening.
  • the flow of air pressurized by the blower 4 is then conveyed via a conditioning box 5 to a radiator intended to heat the air flow before distributing it in the passenger compartment via distribution outlets 6.
  • a thermal conditioning installation may alternatively be centered or semi-centered, depending on whether the blower 4 is integrated within the thermal conditioning installation itself or is offset on one of its lateral faces.
  • the distribution outlets 6 generally comprise at least one windscreen defrosting / defogging mouth, at least one defrosting / defogging mouth of the side windows, at least one air intake located on the dashboard and at least one mouth opening towards the lower part of the cockpit.
  • the thermal conditioning installation comprises an evaporator whose function is to cool and dehumidify the air flow.
  • the evaporator is placed upstream of the radiator, which makes it possible, if desired, to cool the air to dehumidify it, before reheating it.
  • a thermal conditioning installation 1 according to the state of the art has several disadvantages.
  • a large noise is generated within it, as well due to the displacement of the air flow in the ducts as the activity of the blower. This noise can spread in the passenger compartment through the distribution vents of the installation. It represents a considerable noise nuisance for those present in the cabin.
  • solutions of the state of the art consist in increasing the thickness of the internal walls of the packaging plant. so that the latter can absorb some of the noise emissions before they reach the outlets.
  • the present invention aims to provide an improved thermal conditioning installation, to solve the aforementioned drawbacks, while being lightweight, compact, and easily assembled.
  • the proposed technique meets this need. More particularly, in at least one embodiment, the proposed technique relates to a thermal conditioning installation of an air flow for a motor vehicle, comprising at least one heat exchanger, an air blower adapted to blow a flow. pressurized air to said exchanger, a conditioning box adapted to convey the pressurized air of said blower to said heat exchanger, and at least one air-conditioning distribution mouth in the passenger compartment of said vehicle, said installation being characterized in that it comprises at least one wall made of a porous material.
  • thermal conditioning installation of a motor vehicle air flow designates a heating, ventilation and / or air conditioning apparatus for a passenger compartment of a motor vehicle, also designated by the acronym HVAC ( Heating, Ventilation and Air-Conditioning, in English).
  • a "wall" within the meaning of the invention defines a conduit, such as an air intake duct, or a housing in which the air flow driven by the blower is caused to move.
  • a heat exchanger may be in the form of a radiator, whose function is to heat the air passing through it, or on the contrary an evaporator, whose function is to cool and dehumidify the air flow.
  • a thermal conditioning installation comprises at least one wall made of a porous material, that is to say having a structure characterized by the presence of a plurality of open and / or closed pores.
  • a porous material has several advantageous characteristics. In the first place, it is, because of its porous nature and its mechanical flexibility, a good sound insulation. It is therefore able to limit the propagation of acoustic waves in the ducts of the thermal conditioning installation. Noise reduction applies not only to the high frequencies, but also to the low frequencies generated by the structure modes of the installation.
  • Such a porous material is further characterized by a lower density, of the order of 15%.
  • a thermal conditioning installation of an air flow according to the invention has a better noise reduction, a lower mass, and greater flexibility.
  • the porosity of said porous material is greater than 0.8.
  • Porosity is the ratio of the pore volume to the total volume of a porous medium.
  • a porosity greater than 0.8 represents a favorable condition for obtaining a porous wall having better noise reduction, lower mass, and greater flexibility.
  • the pore diameter is between 10 and 100 micrometers.
  • Such a pore diameter represents a favorable condition for obtaining a porous wall having a better noise reduction, a lower mass, and greater flexibility.
  • said wall has at least two zones of different porosity.
  • the attenuation of the noise by the wall and its flexibility increase with its degree of porosity, and vice versa.
  • its mass increases when the porosity decreases.
  • the choice of the location of the most porous zone therefore makes it possible to adjust the properties of the zone by zone. wall, depending on the needs and technical constraints to be met, especially in terms of mechanical strength.
  • said porous material is permeable to air.
  • this porous material comprises an open porous structure in which the pores are interconnected and form very fine channels allowing the passage of air.
  • the thermal conditioning installation is adapted to attenuate acoustic waves whose frequency is between 20 Hz and 20 kHz.
  • the elastic parameters of the porous material including the Young's modulus and the Poisson's ratio.
  • a thermal conditioning installation according to the invention thus makes it possible to improve the acoustic comfort in the cabin of the vehicle, by reducing the noise generated within the HVAC.
  • said porous material is polypropylene.
  • Polypropylene has the advantage of being light, while having a satisfactory mechanical strength with regard to its use. It is also suitable for relatively easy manufacturing processes to implement, such as overmolding.
  • said wall comprises at least one stiffening rib.
  • said wall is located upstream and / or at the level of said blower, in the direction of flow of said air flow.
  • the air blower once in operation, draws a flow of air taken from outside and / or inside the vehicle via the air intake duct, thus creating a vacuum inside the air intake duct.
  • the porous permeable surface of an intake duct according to the invention allows an air passage between the inside and the outside of the leads. When the interior of the latter is in depression, a flow of air from the outside of the duct, including the passenger compartment of the vehicle, can be sucked through this porous wall inside the duct, then in the blower.
  • Such a conduit thus makes it possible to capture a flow of air coming from the interior of the vehicle without a dedicated suction orifice being implemented, this orifice being at the source of pressure losses and a significant noise. .
  • said at least one wall is located downstream of said blower, in the direction of flow of said air flow.
  • said wall is located at the non-functional surfaces of the thermal conditioning installation, for example said conditioning box connecting the blower and the radiator and / or the evaporator, the evacuation zone of the water condensed by the evaporator, the watering plate of the rear feet, or the mouths of distribution.
  • said wall is covered on its outer face with an impervious film.
  • the air blower once in operation, blows the flow of pressurized air to the rooms arranged downstream of the latter, thus creating an overpressure of the ducts and housing involved. Due to the porous nature of the walls according to the invention, the flow of air flowing inside the duct is caused to diffuse at least partly through this porous wall, towards the outside of the conditioning installation. thermal, then causing leaks. The addition of an impervious film on the outer face of the wall makes it possible to block this diffusion process, and thus limit the corresponding leaks.
  • said wall is covered on its inner face with a waterproof film.
  • said wall is a multilayer wall consisting of the superposition of an inner layer of porous material, an impermeable film, and an outer layer of porous material.
  • Such a multilayer structure can attenuate the noise both inside and outside the thermal conditioning installation, while limiting the pressure losses associated with the diffusion of the air flow from the inside out. overpressure to the outside of the thermal conditioning installation.
  • the invention also relates to a motor vehicle characterized in that it comprises a thermal conditioning installation such as that described above.
  • the invention also relates to the use of a porous material for the manufacture of a wall of a thermal conditioning installation of an air flow for a motor vehicle.
  • the invention also relates to a method of manufacturing a porous material wall of a thermal conditioning installation of an air flow for a motor vehicle, said method comprising a step of thermoforming said wall.
  • thermoforming step is implemented with different compression indices.
  • FIG. 1 Front view of a thermal conditioning installation of the passenger compartment of a vehicle, according to the state of the art
  • FIGS. 3a to 3d Schematic views of a conditioning box of a thermal conditioning installation according to one embodiment of the invention
  • FIG. 4 Schematic side view of the air intake unit of a thermal conditioning installation according to one embodiment of the invention
  • FIGS. 5a and 5b Schematic representations of the lower and upper parts of the condensation tray of a thermal conditioning installation according to one embodiment of the invention
  • FIGS. 6a and 6b Diagrammatic representations of the left lateral part seen from the front of the distributor of a thermal conditioning installation according to one embodiment of the invention
  • FIG. 7 Schematic representation of the right-hand side of the distributor of a thermal conditioning installation according to one embodiment of the invention
  • FIG. 8 Schematic representation of the central portion of the distributor of a thermal conditioning installation according to one embodiment of the invention
  • FIGS 10a and 10b Air distribution duct in the passenger compartment of a thermal conditioning installation according to one embodiment of the invention.
  • the principle of the invention is to provide a thermal conditioning installation of an air flow which, at equal volume, has a better noise reduction, a lower mass, and greater flexibility.
  • Such an installation 1 comprises in particular at least one wall 8 made of a porous material.
  • Figures 3a to 3d are schematic views of a packaging box 5 of a thermal conditioning installation 1 according to the invention.
  • a housing 5 is located downstream of the blower 4, in the flow direction of the air flow.
  • the packaging box 5 comprises a porous wall 8 with an area equal to 1.4 dm 2 and a thickness of 20 mm.
  • This wall 8 is made of a porous material permeable to air, that is to say having an open porous structure in which the pores are interconnected and form very fine channels allowing air to pass.
  • the porosity of said porous material is greater than 0.8, and the pore diameter is between 10 and 100 micrometers.
  • Such a wall 8 is particularly adapted to attenuate 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 HVAC 1.
  • This wall 8 is covered on its outer face with an impervious film (not shown).
  • the air blower 4 once in operation, blows the flow of pressurized air to the parts arranged downstream of the latter, thus creating an overpressure of the ducts and casing involved, including the packaging box 5. Because the porous nature of the walls 8, the flow of air flowing inside the duct is caused to diffuse at least partly through these porous walls 8, towards the outside of the thermal conditioning installation 1, causing then leaks. The addition of this impermeable film on the outer face of the wall 8 blocks this diffusion process, and thus limit the risk of leakage.
  • Figures 3b to 3d illustrate different portions of the packaging housing 5 each comprising a porous wall 8 with a thickness of 20 mm and whose surfaces are respectively equal to 4, 3 and 1.4 dm 2 .
  • Figure 4 is a side view of the air intake unit 2 of a thermal conditioning installation 1 having a porous wall 8 permeable to air.
  • a such air intake unit 2 is located upstream of the blower 4, in the direction of flow of the air flow.
  • the air blower 4 once in operation, draws a flow of air taken from outside and / or inside the vehicle via this air intake duct 2, thus creating a vacuum at the same time. inside of the latter.
  • the permeable porous surface 8 of the intake duct 2 allows an air passage between the inside and the outside of the duct 2.
  • a flow of air coming from outside of the duct 2, and in particular of the passenger compartment of the vehicle can be sucked through this porous wall 8 inside the duct 2, then into the blower 4.
  • Such a duct 4 thus makes it possible to capture a flow of air from the interior of the vehicle without a dedicated suction port is implemented, this hole being at the source of pressure losses and a significant noise.
  • FIGS. 5a and 5b are diagrammatic views of the lower and upper portions of the condensation pan of a thermal conditioning installation having a plurality of porous walls 8, in particular porous walls 8 with areas of 1.3 and 0.4 dm 2 .
  • Such a condensation tank is located downstream of the blower 4, in the flow direction of the air flow, and has the particular function of collecting condensed water vapor at the evaporator.
  • the bottom wall 8 of this condensation tray is covered on its inner face with a waterproof film, not shown.
  • This film prevents the water from coming into contact with the porous wall 8, thus avoiding the absorption of water by the porous wall 8.
  • the use of this film thus makes it possible to preserve the capacity of this wall porous 8 to reduce noise while facilitating the evacuation of water collected in the tray.
  • FIGS. 6a and 6b are respectively a view of the left lateral part and a front view of the distributor of the thermal conditioning installation 1 which has several porous walls 8, including a wall 8 with a surface area of 1 dm 2 and thickness equal to 10 mm, and a wall 8 with a surface equal to 0.4 dm 2 and a thickness equal to 2 mm.
  • Each of the walls 8 has on its inner surface a waterproof film, not shown.
  • FIGS. 7 to 10b show other parts of the thermal conditioning installation 1, located downstream of the blower 4, and which each comprise one or more porous walls 8.
  • FIG. 7 is a schematic view of the right lateral part of the distributor of a thermal conditioning installation 1.
  • FIG. 8 is a view of the central portion of the dispenser of a thermal conditioning installation 1 having a plurality of porous walls 8, including a porous wall 8 with a surface area equal to 1 dm 2 and a thickness equal to 2 mm.
  • FIG. 9 is a schematic view of the cover of a thermal conditioning installation 1, which comprises a porous wall 8 with a surface area of 1.5 dm 2 .
  • Figures 10a and 10b illustrate air distribution ducts in the passenger compartment each comprising a porous wall 8 whose surface is respectively 0.7 and 2.9 dm 2 .

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

The invention relates to an apparatus (1) for thermally conditioning an air flow for a motor vehicle, comprising at least one heat exchanger, an air blower (4) adapted for blowing a pressurised air flow to said exchanger, a conditioning housing (5) adapted for directing the pressurised air from said blower (4) to said heat exchanger, and at least one outlet for distributing the conditioned air in the passenger compartment of said vehicle, said apparatus (1) being characterised in that it comprises at least one wall (8) formed from a porous material.

Description

CONDUIT D'ADMISSION D'AIR POREUX POUR HVAC  POROUS AIR INTAKE DUCT FOR HVAC
1. Domaine 1. Domain
La présente invention est relative aux installations de chauffage, ventilation et/ou de climatisation de l'habitacle d'un véhicule automobile, souvent dénommées "HVAC" (pour "Heating, Ventilation and Air-Conditioning" en anglais, et "Bloc de chauffage, ventilation et air conditionné" en français), et désignée ci-après " installation de conditionnement thermique". 2. Art antérieur  The present invention relates to heating, ventilation and / or air conditioning of the passenger compartment of a motor vehicle, often referred to as "HVAC" (for "Heating, Ventilation and Air-Conditioning" in English, and "Heating block , ventilation and air conditioning "in French), and hereinafter referred to as" thermal conditioning installation ". 2. Prior Art
Les installations de conditionnement thermique de véhicule, en captant de l'air extérieur pour le diffuser au sein de l'habitacle, jouent un rôle déterminant en matière de chauffage, de climatisation, et de désembuage des vitres de l'habitacle. Ces installations, d'une taille relativement importante, sont conçues pour être installées dans le compartiment moteur du véhicule, sous le tableau de bord.  Vehicle thermal conditioning installations, by capturing outside air to distribute it within the passenger compartment, play a decisive role in heating, air conditioning and defogging the windows of the passenger compartment. These relatively large installations are designed to be installed in the engine compartment of the vehicle, under the dashboard.
Tel que représenté par les figures 1 et 2, une installation de conditionnement thermique 1 comprend typiquement une unité d'admission 2 d'air ayant une entrée d'aspiration d'air extérieur 2b, destinée à aspirer de l'air prélevé à l'extérieur du véhicule, et une entrée d'aspiration d'air intérieur 2a, destinée à reconditionner de l'air provenant de l'habitacle du véhicule.  As represented by FIGS. 1 and 2, a thermal conditioning installation 1 typically comprises an air intake unit 2 having an external air intake inlet 2b, intended to draw air taken from the outside of the vehicle, and an intake of indoor air intake 2a, for reconditioning air from the passenger compartment of the vehicle.
L'air de l'habitacle étant en général déjà à une température optimale de confort, un tel recyclage de l'air intérieur permet donc de réduire la consommation énergétique de l'installation de conditionnement thermique 1. Ces deux entrées d'air 2a et 2b peuvent être fermées et libérées sélectivement chacune par un volet d'air séparé.  Since the air in the passenger compartment is generally already at an optimum temperature of comfort, such recycling of the indoor air therefore makes it possible to reduce the energy consumption of the thermal conditioning installation 1. These two air inlets 2a and 2b can be closed and selectively released each by a separate air flap.
L'entrée d'air extérieur 2b peut alternativement être orientée vers l'espace de sous-sol du véhicule ou vers la partie inférieure du pare-brise. Dans le second cas, elle est typiquement reliée à un filtre à air et à un séparateur dont la fonction est de séparer l'eau de pluie de l'air prélevé à l'extérieur, au-dessous du pare-brise.  The outside air inlet 2b may alternatively be oriented towards the basement space of the vehicle or towards the lower part of the windshield. In the second case, it is typically connected to an air filter and a separator whose function is to separate the rainwater from the air taken outside, below the windshield.
Ces deux entrées d'air 2a et 2b sont reliées via un conduit d'admission 3 à la paroi supérieure d'une enveloppe de volute en spirale 4a contenant un pulseur 4 d'air entraîné autour d'un axe central. La paroi supérieure de l'enveloppe de volute en spirale 4a est sensiblement plate et comprend en son centre un orifice d'aspiration axiale destiné à communiquer avec le conduit d'admission 3. L'enveloppe de volute 4a est essentiellement coaxiale à l'axe du pulseur 4, bien que l'extrémité inférieure de sa paroi latérale forme une spirale de rayon croissant, adaptée pour orienter progressivement le flux d'air vers une ouverture d'échappement tangentielle. These two air inlets 2a and 2b are connected via an intake duct 3 to the upper wall of a spiral volute casing 4a containing a blower 4 driven air around a central axis. The upper wall of the spiral volute casing 4a is substantially flat and comprises at its center an axial suction port for communicating with the intake duct 3. The volute casing 4a is substantially coaxial with the axis. of the blower 4, although the lower end of its side wall forms a spiral of increasing radius, adapted to gradually guide the flow of air to a tangential exhaust opening.
Le flux d'air mis sous pression par le pulseur 4 est par la suite acheminé via un boîtier de conditionnement 5 vers un radiateur destiné à chauffer le flux d'air avant de le distribuer dans l'habitacle via des bouches de distribution 6.  The flow of air pressurized by the blower 4 is then conveyed via a conditioning box 5 to a radiator intended to heat the air flow before distributing it in the passenger compartment via distribution outlets 6.
De manière connue, une installation de conditionnement thermique peut alternativement être centrée ou semi-centrée, en fonction que le pulseur 4 soit intégré au sein même de l'installation de conditionnement thermique ou soit déporté sur l'une de ses faces latérales.  In a known manner, a thermal conditioning installation may alternatively be centered or semi-centered, depending on whether the blower 4 is integrated within the thermal conditioning installation itself or is offset on one of its lateral faces.
Les bouches de distribution 6 comprennent généralement au moins une bouche de dégivrage/désembuage du pare-brise, au moins une bouche de dégivrage/désembuage des vitres latérales, au moins une bouche d'aération située sur la planche de bord et au moins une bouche s'ouvrant vers la partie inférieure de l'habitacle.  The distribution outlets 6 generally comprise at least one windscreen defrosting / defogging mouth, at least one defrosting / defogging mouth of the side windows, at least one air intake located on the dashboard and at least one mouth opening towards the lower part of the cockpit.
Dans le cas où l'installation de conditionnement thermique est équipée d'une option climatisation, elle comprend un évaporateur ayant pour fonction de refroidir et de déshumidifier le flux d'air. De manière avantageuse, l'évaporateur est placé en amont du radiateur, ce qui permet, si on le désire, de refroidir l'air pour le déshumidifier, avant de le réchauffer.  In the case where the thermal conditioning installation is equipped with an air conditioning option, it comprises an evaporator whose function is to cool and dehumidify the air flow. Advantageously, the evaporator is placed upstream of the radiator, which makes it possible, if desired, to cool the air to dehumidify it, before reheating it.
Une installation de conditionnement thermique 1 selon l'état de la technique présente plusieurs inconvénients. Lorsque l'installation de conditionnement thermique 1 est en fonctionnement, un bruit important est généré en son sein, aussi bien du fait du déplacement du flux d'air dans les conduits que de l'activité du pulseur. Ce bruit peut se propager dans l'habitacle via les bouches de distribution de l'installation. Il représente alors une nuisance sonore considérable pour les personnes présentes dans l'habitacle.  A thermal conditioning installation 1 according to the state of the art has several disadvantages. When the thermal conditioning installation 1 is in operation, a large noise is generated within it, as well due to the displacement of the air flow in the ducts as the activity of the blower. This noise can spread in the passenger compartment through the distribution vents of the installation. It represents a considerable noise nuisance for those present in the cabin.
Afin de pallier à ce problème, des solutions de l'état de la technique consistent à augmenter l'épaisseur des parois internes de l'installation de conditionnement thermique afin que ces dernières puissent absorber une partie des émissions sonores avant qu'elles n'atteignent les bouches de distribution. In order to overcome this problem, solutions of the state of the art consist in increasing the thickness of the internal walls of the packaging plant. so that the latter can absorb some of the noise emissions before they reach the outlets.
Ces solutions présentent cependant l'inconvénient rédhibitoire d'impliquer une augmentation significative de la masse de l'installation de conditionnement thermique, d'où un accroissement de la consommation énergétique du véhicule qui en est équipé.  These solutions, however, have the disadvantage unacceptable to involve a significant increase in the mass of the thermal conditioning installation, resulting in an increase in the energy consumption of the vehicle that is equipped.
Dans ce contexte, la présente invention vise à fournir une installation de conditionnement thermique améliorée, permettant de résoudre les inconvénients précédemment mentionnés, tout en étant légère, compacte, et aisément assemblable.  In this context, the present invention aims to provide an improved thermal conditioning installation, to solve the aforementioned drawbacks, while being lightweight, compact, and easily assembled.
3. Résumé 3. Summary
La technique proposée répond à ce besoin. Plus particulièrement, dans au moins un mode de réalisation, la technique proposée se rapporte à une installation de conditionnement thermique d'un flux d'air pour véhicule automobile, comprenant au moins un échangeur thermique, un pulseur d'air adapté pour souffler un flux d'air sous pression vers ledit échangeur, un boîtier de conditionnement adapté pour acheminer l'air sous pression dudit pulseur vers ledit échangeur thermique, et au moins une bouche de distribution de l'air conditionné dans l'habitacle dudit véhicule, ladite installation étant caractérisée en ce qu'elle comprend au moins une paroi constituée d'un matériau poreux.  The proposed technique meets this need. More particularly, in at least one embodiment, the proposed technique relates to a thermal conditioning installation of an air flow for a motor vehicle, comprising at least one heat exchanger, an air blower adapted to blow a flow. pressurized air to said exchanger, a conditioning box adapted to convey the pressurized air of said blower to said heat exchanger, and at least one air-conditioning distribution mouth in the passenger compartment of said vehicle, said installation being characterized in that it comprises at least one wall made of a porous material.
Dans la présente description, l'expression « installation de conditionnement thermique d'un flux d'air pour véhicule automobile » désigne un appareil de chauffage, ventilation et/ou de climatisation pour un habitacle de véhicule automobile, également désigné par le sigle HVAC (Heating, Ventilation and Air-Conditioning, en langue anglaise). Par ailleurs, une « paroi » au sens de l'invention délimite un conduit, tel un conduit d'admission d'air, ou un boîtier dans lequel le flux d'air entraîné par le pulseur est amené à se déplacer. Un échangeur thermique peut se présenter sous la forme d'un radiateur, ayant pour fonction de chauffer l'air le traversant, ou au contraire un évaporateur, ayant pour fonction de refroidir et de déshumidifier le flux d'air.  In the present description, the term "thermal conditioning installation of a motor vehicle air flow" designates a heating, ventilation and / or air conditioning apparatus for a passenger compartment of a motor vehicle, also designated by the acronym HVAC ( Heating, Ventilation and Air-Conditioning, in English). Furthermore, a "wall" within the meaning of the invention defines a conduit, such as an air intake duct, or a housing in which the air flow driven by the blower is caused to move. A heat exchanger may be in the form of a radiator, whose function is to heat the air passing through it, or on the contrary an evaporator, whose function is to cool and dehumidify the air flow.
Une installation de conditionnement thermique selon l'invention comprend au moins une paroi constituée d'un matériau poreux, c'est-à-dire ayant une structure caractérisée par la présence d'une pluralité de pores ouverts et/ou fermés. Un tel matériau poreux présente plusieurs caractéristiques avantageuses. En premier lieu, il constitue, du fait de son caractère poreux et de sa souplesse mécanique, un bon isolant phonique. Il est donc à même de limiter la propagation des ondes acoustiques dans les conduits de l'installation de conditionnement thermique. La réduction du bruit s'applique non seulement sur les hautes fréquences, mais aussi sur les basses fréquences générées par les modes de structure de l'installation. A thermal conditioning installation according to the invention comprises at least one wall made of a porous material, that is to say having a structure characterized by the presence of a plurality of open and / or closed pores. Such a porous material has several advantageous characteristics. In the first place, it is, because of its porous nature and its mechanical flexibility, a good sound insulation. It is therefore able to limit the propagation of acoustic waves in the ducts of the thermal conditioning installation. Noise reduction applies not only to the high frequencies, but also to the low frequencies generated by the structure modes of the installation.
Un tel matériau poreux est de plus caractérisé par une masse volumique plus faible, de l'ordre de 15%. A volume égal, une installation de conditionnement thermique d'un flux d'air selon l'invention présente une meilleure réduction du bruit, une masse plus faible, et une plus grande souplesse.  Such a porous material is further characterized by a lower density, of the order of 15%. At equal volume, a thermal conditioning installation of an air flow according to the invention has a better noise reduction, a lower mass, and greater flexibility.
Selon un aspect particulier de l'invention, la porosité dudit matériau poreux est supérieure à 0.8.  According to a particular aspect of the invention, the porosity of said porous material is greater than 0.8.
La porosité est le rapport entre le volume des pores et le volume total d'un milieu poreux. Une porosité supérieure à 0.8 représente une condition favorable à l'obtention d'une paroi poreuse présentant une meilleure réduction du bruit, une masse plus faible, et une plus grande souplesse.  Porosity is the ratio of the pore volume to the total volume of a porous medium. A porosity greater than 0.8 represents a favorable condition for obtaining a porous wall having better noise reduction, lower mass, and greater flexibility.
Selon un aspect particulier de l'invention, le diamètre des pores est compris entre 10 et 100 micromètres.  According to a particular aspect of the invention, the pore diameter is between 10 and 100 micrometers.
Un tel diamètre de pore représente une condition favorable à l'obtention d'une paroi poreuse présentant une meilleure réduction du bruit, une masse plus faible, et une plus grande souplesse.  Such a pore diameter represents a favorable condition for obtaining a porous wall having a better noise reduction, a lower mass, and greater flexibility.
Selon un aspect particulier de l'invention, ladite paroi présente au moins deux zones de porosité différentes.  According to a particular aspect of the invention, said wall has at least two zones of different porosity.
Tel que décrit ci-dessus, l'atténuation du bruit par la paroi ainsi que sa souplesse augmentent avec son degré de porosité, et inversement. Au contraire, sa masse augmente lorsque la porosité diminue. Dans le cadre d'une paroi présentant au moins deux zones de porosité différentes ou en d'autres termes, plusieurs degrés de porosité, le choix de l'emplacement de la zone la plus poreuse permet donc d'ajuster par zone les propriétés de la paroi, en fonction des besoins et des contraintes techniques à respecter, notamment en terme de résistance mécanique.  As described above, the attenuation of the noise by the wall and its flexibility increase with its degree of porosity, and vice versa. On the contrary, its mass increases when the porosity decreases. In the context of a wall having at least two zones of different porosity or in other words, several degrees of porosity, the choice of the location of the most porous zone therefore makes it possible to adjust the properties of the zone by zone. wall, depending on the needs and technical constraints to be met, especially in terms of mechanical strength.
Selon un aspect particulier de l'invention, ledit matériau poreux est perméable à l'air. En d'autres termes, ce matériau poreux comprend une structure poreuse ouverte dans laquelle les pores sont reliés entre eux et forment des canaux très fins laissant passer l'air. According to a particular aspect of the invention, said porous material is permeable to air. In other words, this porous material comprises an open porous structure in which the pores are interconnected and form very fine channels allowing the passage of air.
Selon un aspect particulier de l'invention, l'installation de conditionnement thermique est adaptée pour atténuer des ondes acoustiques dont la fréquence est comprise entre 20 Hz et 20 kHz.  According to a particular aspect of the invention, the thermal conditioning installation is adapted to attenuate acoustic waves whose frequency is between 20 Hz and 20 kHz.
Plusieurs paramètres sont considérés pour faire varier la plage d'atténuation des ondes acoustiques, tels que :  Several parameters are considered to vary the attenuation range of acoustic waves, such as:
• la tortuosité, qui désigne le rapport entre la diffusion de l'air dans un espace libre et la diffusion de l'air à travers le matériau poreux,  • tortuosity, which refers to the relationship between the diffusion of air in a free space and the diffusion of air through the porous material,
• la résistance à l'écoulement de l'air,  • resistance to the flow of air,
• la dimension des pores et les liaisons existantes entre les pores,  • the size of the pores and the existing connections between the pores,
• les paramètres élastiques du matériau poreux, y inclus le module de Young et le coefficient de Poisson.  The elastic parameters of the porous material, including the Young's modulus and the Poisson's ratio.
Une installation de conditionnement thermique selon l'invention permet ainsi d'améliorer le confort acoustique dans l'habitacle du véhicule, en réduisant les bruits générés au sein de l'HVAC.  A thermal conditioning installation according to the invention thus makes it possible to improve the acoustic comfort in the cabin of the vehicle, by reducing the noise generated within the HVAC.
Selon un aspect particulier de l'invention, ledit matériau poreux est du polypropylène.  According to a particular aspect of the invention, said porous material is polypropylene.
Le polypropylène présente l'avantage d'être léger, tout en ayant une résistance mécanique satisfaisante au regard de son utilisation. Il est de plus adapté pour des procédés de fabrication relativement aisés à mettre en œuvre, tel que le surmoulage.  Polypropylene has the advantage of being light, while having a satisfactory mechanical strength with regard to its use. It is also suitable for relatively easy manufacturing processes to implement, such as overmolding.
Selon un aspect particulier de l'invention, ladite paroi comprend au moins une nervure de rigidification.  According to a particular aspect of the invention, said wall comprises at least one stiffening rib.
Ceci permet de renforcer mécaniquement la paroi poreuse ciblée, tout en limitant le gain en masse de cette dernière.  This allows to mechanically reinforce the targeted porous wall, while limiting the mass gain of the latter.
Selon un aspect particulier de l'invention, ladite paroi est localisée en amont et/ou au niveau dudit pulseur, dans le sens d'écoulement dudit flux d'air.  According to a particular aspect of the invention, said wall is located upstream and / or at the level of said blower, in the direction of flow of said air flow.
Le pulseur d'air, une fois en marche, aspire un flux d'air prélevé à l'extérieur et/ou à l'intérieur du véhicule via le conduit d'admission d'air, créant ainsi une dépression à l'intérieur de ce dernier. La surface poreuse perméable à l'air d'un conduit d'admission selon l'invention permet un passage d'air entre l'intérieur et l'extérieur du conduit. Lorsque l'intérieur de ce dernier est en dépression, un flux d'air provenant de l'extérieur du conduit, et notamment de l'habitacle du véhicule, peut être aspiré au travers de cette paroi poreuse à l'intérieur du conduit, puis dans le pulseur. Un tel conduit permet donc de capter un flux d'air provenant de l'intérieur du véhicule sans qu'un orifice d'aspiration dédié ne soit mis en œuvre, cet orifice étant à la source de pertes de charge et d'un bruit significatif. The air blower, once in operation, draws a flow of air taken from outside and / or inside the vehicle via the air intake duct, thus creating a vacuum inside the air intake duct. this last. The porous permeable surface of an intake duct according to the invention allows an air passage between the inside and the outside of the leads. When the interior of the latter is in depression, a flow of air from the outside of the duct, including the passenger compartment of the vehicle, can be sucked through this porous wall inside the duct, then in the blower. Such a conduit thus makes it possible to capture a flow of air coming from the interior of the vehicle without a dedicated suction orifice being implemented, this orifice being at the source of pressure losses and a significant noise. .
Selon un aspect particulier de l'invention, ladite au moins une paroi est localisée en aval dudit pulseur, dans le sens d'écoulement dudit flux d'air.  According to a particular aspect of the invention, said at least one wall is located downstream of said blower, in the direction of flow of said air flow.
De manière avantageuse, ladite paroi est localisée au niveau des surfaces non fonctionnelles de l'installation de conditionnement thermique, par exemple ledit boîtier de conditionnement faisant la liaison entre le pulseur et le radiateur et/ou l'évaporateur, la zone d'évacuation de l'eau condensée par l'évaporateur, la plaque d'arrosage des pieds arrière, ou les bouches de distribution.  Advantageously, said wall is located at the non-functional surfaces of the thermal conditioning installation, for example said conditioning box connecting the blower and the radiator and / or the evaporator, the evacuation zone of the water condensed by the evaporator, the watering plate of the rear feet, or the mouths of distribution.
Selon un aspect particulier de l'invention, ladite paroi est recouverte sur sa face externe d'un film imperméable à l'air.  According to a particular aspect of the invention, said wall is covered on its outer face with an impervious film.
Le pulseur d'air, une fois en marche, souffle le flux d'air sous pression vers les pièces agencées en aval de ce dernier, créant ainsi une surpression des conduits et boîtier impliqués. Du fait du caractère poreux des parois selon l'invention le flux d'air s'écoulant à l'intérieur du conduit est amené à diffuser au moins en partie au travers de cette paroi poreuse, vers l'extérieur de l'installation de conditionnement thermique, provoquant alors des fuites. L'ajout d'un film imperméable à l'air sur la face externe de la paroi permet de bloquer ce processus de diffusion, et ainsi de limiter les fuites correspondantes.  The air blower, once in operation, blows the flow of pressurized air to the rooms arranged downstream of the latter, thus creating an overpressure of the ducts and housing involved. Due to the porous nature of the walls according to the invention, the flow of air flowing inside the duct is caused to diffuse at least partly through this porous wall, towards the outside of the conditioning installation. thermal, then causing leaks. The addition of an impervious film on the outer face of the wall makes it possible to block this diffusion process, and thus limit the corresponding leaks.
Selon un aspect particulier de l'invention, ladite paroi est recouverte sur sa face interne d'un film imperméable à l'eau.  According to a particular aspect of the invention, said wall is covered on its inner face with a waterproof film.
Au niveau de la zone d'évacuation de l'eau condensée par l'évaporateur, également appelée bac de condensation, l'eau accumulée peut éventuellement être absorbée par la paroi poreuse, rendant alors plus difficile l'évacuation de cette eau, tout en réduisant la capacité de cette paroi poreuse à atténuer le bruit. Le recouvrement de cette paroi d'un film imperméable à l'eau, sur sa face interne, permet de pallier à cet inconvénient, le film imperméable à l'eau empêchant la mise en contact de l'eau avec la paroi poreuse. Selon un aspect particulier de l'invention, ladite paroi est une paroi multicouche constituée de la superposition d'une couche interne de matériau poreux, d'un film imperméable à l'air, et d'une couche externe de matériau poreux. At the level of the evaporated water evacuation zone, also called condensation pan, the accumulated water may be absorbed by the porous wall, making it more difficult to evacuate this water, while reducing the ability of this porous wall to reduce noise. The covering of this wall with a water-impermeable film on its internal face makes it possible to overcome this disadvantage, since the waterproof film prevents the water from coming into contact with the porous wall. According to a particular aspect of the invention, said wall is a multilayer wall consisting of the superposition of an inner layer of porous material, an impermeable film, and an outer layer of porous material.
Une telle structure multicouche permet d'atténuer le bruit tant à l'intérieur qu'à l'extérieur de l'installation de conditionnement thermique, tout en limitant les pertes de charges associés à la diffusion du flux d'air depuis l'intérieur en surpression vers l'extérieur de l'installation de conditionnement thermique.  Such a multilayer structure can attenuate the noise both inside and outside the thermal conditioning installation, while limiting the pressure losses associated with the diffusion of the air flow from the inside out. overpressure to the outside of the thermal conditioning installation.
L'invention concerne également un véhicule automobile caractérisé en ce qu'il comprend une installation de conditionnement thermique telle que celle décrite ci- dessus.  The invention also relates to a motor vehicle characterized in that it comprises a thermal conditioning installation such as that described above.
L'invention concerne également l'utilisation d'un matériau poreux pour la fabrication d'une paroi d'une installation de conditionnement thermique d'un flux d'air pour véhicule automobile.  The invention also relates to the use of a porous material for the manufacture of a wall of a thermal conditioning installation of an air flow for a motor vehicle.
L'invention concerne également un procédé de fabrication d'une paroi en matériau poreux d'une installation de conditionnement thermique d'un flux d'air pour véhicule automobile, ledit procédé comprenant une étape de thermoformage de ladite paroi.  The invention also relates to a method of manufacturing a porous material wall of a thermal conditioning installation of an air flow for a motor vehicle, said method comprising a step of thermoforming said wall.
Selon un aspect particulier, ladite étape de thermoformage est mise en œuvre avec différents indices de compression.  According to a particular aspect, said thermoforming step is implemented with different compression indices.
Il est ainsi possible d'obtenir une paroi poreuse présentant des variations d'épaisseur et ou de porosité.  It is thus possible to obtain a porous wall with variations in thickness and or porosity.
4. Figures 4. Figures
D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description suivante de modes de réalisation particuliers, donnés à titre de simples exemples illustratifs et non limitatifs, et des figures annexées, à savoir :  Other features and advantages of the invention will appear on reading the following description of particular embodiments, given as simple illustrative and non-limiting examples, and the appended figures, namely:
Figure 1 - Vue de face d'une installation de conditionnement thermique de l'habitacle d'un véhicule, selon l'état de la technique,  Figure 1 - Front view of a thermal conditioning installation of the passenger compartment of a vehicle, according to the state of the art,
- Figure 2 - Vue arrière de l'installation de la Figure 1, - Figure 2 - Rear view of the installation of Figure 1,
Figures 3a à 3d - Vues schématiques d'un boîtier de conditionnement d'une installation de conditionnement thermique selon un mode de réalisation de l'invention, Figure 4 - Représentation schématique de côté de l'unité d'admission d'air d'une installation de conditionnement thermique selon un mode de réalisation de l'invention, FIGS. 3a to 3d - Schematic views of a conditioning box of a thermal conditioning installation according to one embodiment of the invention, FIG. 4 - Schematic side view of the air intake unit of a thermal conditioning installation according to one embodiment of the invention,
Figures 5a et 5b - Représentations schématiques des parties inférieure et supérieure du bac de condensation d'une installation de conditionnement thermique selon un mode de réalisation de l'invention,  Figures 5a and 5b - Schematic representations of the lower and upper parts of the condensation tray of a thermal conditioning installation according to one embodiment of the invention,
Figures 6a et 6b - Représentations schématiques de la partie latérale gauche vue de face du distributeur d'une installation de conditionnement thermique selon un mode de réalisation de l'invention,  FIGS. 6a and 6b - Diagrammatic representations of the left lateral part seen from the front of the distributor of a thermal conditioning installation according to one embodiment of the invention,
- Figure 7 - Représentation schématique de la partie latérale droite du distributeur d'une installation de conditionnement thermique selon un mode de réalisation de l'invention, FIG. 7 - Schematic representation of the right-hand side of the distributor of a thermal conditioning installation according to one embodiment of the invention,
Figure 8 - Représentation schématique de la partie centrale du distributeur d'une installation de conditionnement thermique selon un mode de réalisation de l'invention,  Figure 8 - Schematic representation of the central portion of the distributor of a thermal conditioning installation according to one embodiment of the invention,
Figure 9 - Couvercle d'une installation de conditionnement thermique selon un mode de réalisation de l'invention,  Figure 9 - Cover of a thermal conditioning installation according to one embodiment of the invention,
Figures 10a et 10b - Conduit de distribution de l'air dans l'habitacle d'une installation de conditionnement thermique selon un mode de réalisation de l'invention.  Figures 10a and 10b - Air distribution duct in the passenger compartment of a thermal conditioning installation according to one embodiment of the invention.
Les différents éléments illustrés par les figures ne sont pas nécessairement représentés à l'échelle réelle, l'accent étant davantage porté sur la représentation du fonctionnement général de l'invention.  The various elements illustrated by the figures are not necessarily represented on a real scale, the emphasis being more on the representation of the general operation of the invention.
5. Description détaillée de modes de réalisation particuliers de l'invention 5. Detailed Description of Particular Embodiments of the Invention
Plusieurs modes de réalisation particuliers de l'invention sont présentés dans la suite de la description. Il est bien entendu que la présente invention n'est nullement limitée par ces modes de réalisation particuliers et que d'autres modes de réalisation peuvent être mis en œuvre.  Several particular embodiments of the invention are presented in the following description. It is understood that the present invention is not limited by these particular embodiments and other embodiments may be implemented.
Le principe de l'invention consiste à fournir une installation de conditionnement thermique d'un flux d'air qui, à volume égal, présente une meilleure réduction du bruit, une masse plus faible, et une plus grande souplesse. Une telle installation 1 comprend notamment au moins une paroi 8 constituée d'un matériau poreux. The principle of the invention is to provide a thermal conditioning installation of an air flow which, at equal volume, has a better noise reduction, a lower mass, and greater flexibility. Such an installation 1 comprises in particular at least one wall 8 made of a porous material.
Les figures 3a à 3d sont des vues schématiques d'un boîtier de conditionnement 5 d'une installation 1 de conditionnement thermique selon l'invention. Un tel boîtier 5 est localisé en aval du pulseur 4, dans le sens d'écoulement du flux d'air.  Figures 3a to 3d are schematic views of a packaging box 5 of a thermal conditioning installation 1 according to the invention. Such a housing 5 is located downstream of the blower 4, in the flow direction of the air flow.
Tel qu'illustré par la figure 3a, le boîtier de conditionnement 5 comprend une paroi poreuse 8 d'une surface égale à 1.4 dm2 et d'une épaisseur de 20 mm. Cette paroi 8 est constituée d'un matériau poreux perméable à l'air, c'est-à-dire ayant une structure poreuse ouverte dans laquelle les pores sont reliés entre eux et forment des canaux très fins laissant passer l'air. As illustrated by FIG. 3a, the packaging box 5 comprises a porous wall 8 with an area equal to 1.4 dm 2 and a thickness of 20 mm. This wall 8 is made of a porous material permeable to air, that is to say having an open porous structure in which the pores are interconnected and form very fine channels allowing air to pass.
Selon un aspect particulier de l'invention, la porosité dudit matériau poreux est supérieure à 0.8, et le diamètre des pores est compris entre 10 et 100 micromètres.  According to a particular aspect of the invention, the porosity of said porous material is greater than 0.8, and the pore diameter is between 10 and 100 micrometers.
Une telle paroi 8 est notamment adaptée pour atténuer des ondes acoustiques dont la fréquence est comprise entre 20 Hz et 20 kHz, ce qui permet d'améliorer le confort acoustique dans l'habitacle du véhicule en réduisant les bruits générés au sein de l'HVAC 1.  Such a wall 8 is particularly adapted to attenuate 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 HVAC 1.
Cette paroi 8 est recouverte sur sa face externe d'un film imperméable à l'air (non représenté).  This wall 8 is covered on its outer face with an impervious film (not shown).
Le pulseur d'air 4, une fois en marche, souffle le flux d'air sous-pression vers les pièces agencées en aval de ce dernier, créant ainsi une surpression des conduits et boîtier impliqués, dont le boîtier de conditionnement 5. Du fait du caractère poreux des parois 8, le flux d'air s'écoulant à l'intérieur du conduit est amené à diffuser au moins en partie au travers de ces parois poreuses 8, vers l'extérieur de l'installation de conditionnement thermique 1, provoquant alors des fuites. L'ajout de ce film imperméable à l'air sur la face externe de la paroi 8 permet de bloquer ce processus de diffusion, et ainsi de limiter les risques de fuite.  The air blower 4, once in operation, blows the flow of pressurized air to the parts arranged downstream of the latter, thus creating an overpressure of the ducts and casing involved, including the packaging box 5. Because the porous nature of the walls 8, the flow of air flowing inside the duct is caused to diffuse at least partly through these porous walls 8, towards the outside of the thermal conditioning installation 1, causing then leaks. The addition of this impermeable film on the outer face of the wall 8 blocks this diffusion process, and thus limit the risk of leakage.
Les figures 3b à 3d illustrent différentes portions du boîtier de conditionnement 5 comprenant chacune une paroi poreuse 8 d'une épaisseur de 20 mm et dont les surfaces sont respectivement égales à 4, 3 et 1.4 dm2. Figures 3b to 3d illustrate different portions of the packaging housing 5 each comprising a porous wall 8 with a thickness of 20 mm and whose surfaces are respectively equal to 4, 3 and 1.4 dm 2 .
La figure 4 est une vue de côté de l'unité d'admission d'air 2 d'une installation de conditionnement thermique 1 présentant une paroi poreuse 8 perméable à l'air. Une telle unité d'admission d'air 2 est localisée en amont du pulseur 4, dans le sens d'écoulement du flux d'air. Figure 4 is a side view of the air intake unit 2 of a thermal conditioning installation 1 having a porous wall 8 permeable to air. A such air intake unit 2 is located upstream of the blower 4, in the direction of flow of the air flow.
Le pulseur d'air 4, une fois en marche, aspire un flux d'air prélevé à l'extérieur et/ou à l'intérieur du véhicule via ce conduit d'admission d'air 2, créant ainsi une dépression à l'intérieur de ce dernier. La surface poreuse perméable 8 du conduit d'admission 2 permet un passage d'air entre l'intérieur et l'extérieur du conduit 2. Lorsque l'intérieur de ce dernier est en dépression, un flux d'air provenant de l'extérieur du conduit 2, et notamment de l'habitacle du véhicule, peut être aspiré au travers de cette paroi poreuse 8 à l'intérieur du conduit 2, puis dans le pulseur 4. Un tel conduit 4 permet donc de capter un flux d'air provenant de l'intérieur du véhicule sans qu'un orifice d'aspiration dédié ne soit mis en œuvre, cet orifice étant à la source de pertes de charge et d'un bruit significatif.  The air blower 4, once in operation, draws a flow of air taken from outside and / or inside the vehicle via this air intake duct 2, thus creating a vacuum at the same time. inside of the latter. The permeable porous surface 8 of the intake duct 2 allows an air passage between the inside and the outside of the duct 2. When the interior of the latter is in a vacuum, a flow of air coming from outside of the duct 2, and in particular of the passenger compartment of the vehicle, can be sucked through this porous wall 8 inside the duct 2, then into the blower 4. Such a duct 4 thus makes it possible to capture a flow of air from the interior of the vehicle without a dedicated suction port is implemented, this hole being at the source of pressure losses and a significant noise.
Les figures 5a et 5b sont des vues schématiques des parties inférieure et supérieure du bac de condensation d'une installation de conditionnement thermique présentant plusieurs parois poreuses 8, notamment des parois poreuses 8 de surfaces égales à 1.3 et 0.4 dm2. Un tel bac de condensation est localisé en aval du pulseur 4, dans le sens d'écoulement du flux d'air, et a notamment pour fonction de récolter la vapeur d'eau condensée au niveau de l'évaporateur. FIGS. 5a and 5b are diagrammatic views of the lower and upper portions of the condensation pan of a thermal conditioning installation having a plurality of porous walls 8, in particular porous walls 8 with areas of 1.3 and 0.4 dm 2 . Such a condensation tank is located downstream of the blower 4, in the flow direction of the air flow, and has the particular function of collecting condensed water vapor at the evaporator.
La paroi 8 de fond de ce bac de condensation est recouverte sur sa face interne d'un film imperméable à l'eau, non représenté. Ce film empêche la mise en contact de l'eau avec la paroi poreuse 8, évitant de ce fait l'absorption de l'eau par la paroi poreuse 8. La mise en œuvre de ce film permet donc de préserver la capacité de cette paroi poreuse 8 à atténuer le bruit tout en facilitant l'évacuation de l'eau récoltée dans le bac.  The bottom wall 8 of this condensation tray is covered on its inner face with a waterproof film, not shown. This film prevents the water from coming into contact with the porous wall 8, thus avoiding the absorption of water by the porous wall 8. The use of this film thus makes it possible to preserve the capacity of this wall porous 8 to reduce noise while facilitating the evacuation of water collected in the tray.
Les figures 6a et 6b sont respectivement une vue de la partie latérale gauche et une vue de face du distributeur de l'installation de conditionnement thermique 1 qui présente plusieurs parois poreuses 8, dont une paroi 8 de surface égale à 1 dm2 et d'épaisseur égale à 10 mm, et une paroi 8 de surface égale à 0.4 dm2 et d'épaisseur égale à 2 mm. Chacune des parois 8 présente sur sa surface interne un film imperméable à l'eau, non représenté. FIGS. 6a and 6b are respectively a view of the left lateral part and a front view of the distributor of the thermal conditioning installation 1 which has several porous walls 8, including a wall 8 with a surface area of 1 dm 2 and thickness equal to 10 mm, and a wall 8 with a surface equal to 0.4 dm 2 and a thickness equal to 2 mm. Each of the walls 8 has on its inner surface a waterproof film, not shown.
Les figures 7 à 10b représentent d'autres parties de l'installation de conditionnement thermique 1, localisées en aval du pulseur 4, et qui comprennent chacune une ou plusieurs parois poreuses 8. En particulier, la figure 7 est une vue schématique de la partie latérale droite du distributeur d'une installation de conditionnement thermique 1. FIGS. 7 to 10b show other parts of the thermal conditioning installation 1, located downstream of the blower 4, and which each comprise one or more porous walls 8. In particular, FIG. 7 is a schematic view of the right lateral part of the distributor of a thermal conditioning installation 1.
La figure 8 est une vue de la partie centrale du distributeur d'une installation de conditionnement thermique 1 présentant plusieurs parois poreuses 8 dont une paroi poreuse 8 de surface égale à 1 dm2 et d'épaisseur égale à 2 mm. FIG. 8 is a view of the central portion of the dispenser of a thermal conditioning installation 1 having a plurality of porous walls 8, including a porous wall 8 with a surface area equal to 1 dm 2 and a thickness equal to 2 mm.
La figure 9 est une vue schématique du couvercle d'une installation de conditionnement thermique 1, qui comprend une paroi poreuse 8 de surface égale à 1.5 dm2. FIG. 9 is a schematic view of the cover of a thermal conditioning installation 1, which comprises a porous wall 8 with a surface area of 1.5 dm 2 .
Les figures 10a et 10b illustrent des conduits de distribution de l'air dans l'habitacle comprenant chacun une paroi poreuse 8 dont la surface est respectivement égale à 0.7 et 2.9 dm2. Figures 10a and 10b illustrate air distribution ducts in the passenger compartment each comprising a porous wall 8 whose surface is respectively 0.7 and 2.9 dm 2 .

Claims

REVENDICATIONS
1. Installation (1) de conditionnement thermique d'un flux d'air pour véhicule automobile, comprenant au moins un échangeur thermique, un pulseur (4) d'air adapté pour souffler un flux d'air sous pression vers ledit échangeur, un boîtier (5) de conditionnement adapté pour acheminer l'air sous pression dudit pulseur (4) vers ledit échangeur thermique, et au moins une bouche de distribution de l'air conditionné dans l'habitacle dudit véhicule, ladite installation (1) étant caractérisée en ce qu'elle comprend au moins une paroi (8) constituée d'un matériau poreux. 1. Installation (1) thermal conditioning of an air flow for a motor vehicle, comprising at least one heat exchanger, an air blower (4) adapted to blow a flow of air under pressure to said exchanger, a packaging box (5) adapted to convey the pressurized air of said blower (4) to said heat exchanger, and at least one air-conditioning distribution mouth in the passenger compartment of said vehicle, said installation (1) being characterized in that it comprises at least one wall (8) made of a porous material.
2. Installation (1) de conditionnement thermique selon la revendication 1, caractérisée en ce que la porosité dudit matériau poreux est supérieure à 0.8. 2. Installation (1) for thermal conditioning according to claim 1, characterized in that the porosity of said porous material is greater than 0.8.
3. Installation (1) de conditionnement thermique selon la revendication 1 ou 2, caractérisée en ce que ledit matériau poreux est perméable à l'air. 3. Installation (1) thermal conditioning according to claim 1 or 2, characterized in that said porous material is permeable to air.
4. Installation (1) de conditionnement thermique selon l'une quelconque des revendications 1 à 3, caractérisée en ce qu'elle est adapté pour atténuer des ondes acoustiques dont la fréquence est comprise entre 20 Hz et 20 kHz. 4. Installation (1) for thermal conditioning according to any one of claims 1 to 3, characterized in that it is adapted to attenuate acoustic waves whose frequency is between 20 Hz and 20 kHz.
5. Conduit (3) d'admission d'air selon l'une quelconque des revendications 1 à 4, caractérisé en ce que ladite paroi (8) comprend au moins une nervure de rigidification. 5. duct (3) for admission of air according to any one of claims 1 to 4, characterized in that said wall (8) comprises at least one stiffening rib.
6. Installation (1) de conditionnement thermique selon la revendication 3, caractérisée en ce que ladite paroi (8) est localisée en amont et/ou au niveau dudit pulseur (4), dans le sens d'écoulement dudit flux d'air. 6. Installation (1) for thermal conditioning according to claim 3, characterized in that said wall (8) is located upstream and / or at said blower (4) in the direction of flow of said air flow.
7. Installation (1) de conditionnement thermique selon l'une quelconque des revendications 1 à 5, caractérisée en ce que ladite au moins une paroi (8) est localisée en aval dudit pulseur (4), dans le sens d'écoulement dudit flux d'air. 7. Installation (1) for thermal conditioning according to any one of claims 1 to 5, characterized in that said at least one wall (8) is located downstream of said blower (4) in the direction of flow of said flow air.
8. Installation (1) de conditionnement thermique selon la revendication 7, caractérisée en ce que ladite paroi (8) est recouverte sur sa face externe d'un film imperméable à l'air. 8. Installation (1) for thermal conditioning according to claim 7, characterized in that said wall (8) is covered on its outer surface with an impervious film.
9. Installation (1) de conditionnement thermique selon l'une des revendications 7 et 8, caractérisée en ce que ladite paroi (8) est recouverte sur sa face interne d'un film imperméable à l'eau. 9. Installation (1) for thermal conditioning according to one of claims 7 and 8, characterized in that said wall (8) is covered on its inner face with a waterproof film.
10. Installation (1) de conditionnement thermique selon l'une quelconque des revendications 1 à 9, caractérisée en ce que ladite paroi (8) est une paroi multicouche constituée de la superposition d'une couche interne de matériau poreux, d'un film imperméable à l'air, et d'une couche externe de matériau poreux. 10. Installation (1) thermal conditioning according to any one of claims 1 to 9, characterized in that said wall (8) is a multilayer wall consisting of the superposition of an inner layer of porous material, a film impervious to air, and an outer layer of porous material.
EP18725576.5A 2017-05-05 2018-04-19 Porous air inlet duct for a hvac system Withdrawn EP3619068A1 (en)

Applications Claiming Priority (2)

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FR1753982A FR3065917B1 (en) 2017-05-05 2017-05-05 POROUS AIR INTAKE DUCT FOR HVAC
PCT/FR2018/050985 WO2018202973A1 (en) 2017-05-05 2018-04-19 Porous air inlet duct for a hvac system

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EP3619068A1 true EP3619068A1 (en) 2020-03-11

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EP (1) EP3619068A1 (en)
JP (1) JP2020518510A (en)
CN (1) CN110603161A (en)
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WO (1) WO2018202973A1 (en)

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FR3065917A1 (en) 2018-11-09
FR3065917B1 (en) 2020-05-08
WO2018202973A1 (en) 2018-11-08
JP2020518510A (en) 2020-06-25
CN110603161A (en) 2019-12-20
US20200164715A1 (en) 2020-05-28

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